CN216141718U - Double-needle sewing machine with variable needle pitch and needle number - Google Patents

Abstract

The utility model relates to a double-needle sewing machine with variable needle pitch and needle number, comprising: a needle fixing frame, a needle moving frame, a headstock, a needle pitch adjusting device and a needle position switching device, wherein needles are respectively arranged on the needle fixing frame and the needle moving frame, the needle movable frame is movably connected with the needle fixed frame, in addition, the headstock is provided with a needle bar and an upper shaft, the needle bar is connected with the needle fixed frame, the upper shaft can rotate to drive the needle bar, the needle fixing frame and the needle movable frame to move up and down, wherein the needle movable frame can transversely move relative to the needle fixed frame through the needle pitch adjusting device to increase or decrease the transverse distance between the two needles, the needle position switching device drives the needle movable frame to move relative to the needle fixing frame, and one of the needles moves back to the sewing position, so that the sewing machine not only can change the transverse distance between the two needles, but also can selectively use the two needles or a single needle to perform sewing operation.

Description

Double-needle sewing machine with variable needle pitch and needle number

Technical Field

The present invention relates to a two-needle sewing machine, and more particularly to a two-needle sewing machine with a variable needle pitch for selectively performing a sewing operation using two needles or a single needle while changing a distance between the two needles during the sewing operation.

Background

With the development of automation and high speed of sewing machines, industrial sewing machines are now being developed with various models of functions for different purposes, such as: single needle pattern sewing machines (which can freely change the sewing path by using X-Y axis to drive the automatic moving material), single needle rotating head pattern sewing machines (which can further keep the consistency of stitches in each sewing direction) or double needle rotating head pattern sewing machines (which can simultaneously sew two equidistant curved stitches).

However, the stitches with parallel double needles can produce better bonding strength and beautiful appearance for the sewn product, and further various clothes in life can be seen in the application of double needle sewing, as shown in fig. 1A and fig. 1B, the double needle rotary head pattern sewing machine 60 is a double needle computer sewing machine, and a head rotary component 61 is provided above the double needle rotary head pattern sewing machine 60, and a base rotary component 62 and an X-Y axis feeding component 63 are provided below the head rotary component 61 of the double needle rotary head pattern sewing machine 60, wherein the head rotary component 61 can drive a needle bar 64 to rotate, so that a needle clamp 65 installed at the end of the needle bar 64 can synchronously drive two machine needles 66 arranged at intervals to rotate, and when the needle bar 64 rotates through the head rotary component 61, the base rotary component 62 drives a needle plate 67 and a base (not shown) to rotate simultaneously, the two needle holes 671 of the needle plate 67 can be respectively aligned with one of the needles 66 continuously one by one, and in addition, the X-Y axis feeding assembly 63 drives the sewing material to move along the X axis direction and the Y axis direction in the stitches through the clamp, so that the head rotating assembly 61, the base rotating assembly 62 and the X-Y axis feeding assembly 63 are mutually matched to form two parallel and parallel stitches on the sewing material, and the traditional manual operation double-needle sewing machine can be replaced, and the work efficiency of sewing the articles can be improved.

However, the types of the sewing materials are various, and the thickness and hardness of the sewing materials are different, and the needle pitch and the stitch required to be used for different sewing material conditions will be different, and generally, the double needle rotary head pattern sewing machine 60 needs to increase the distance between the two needles 66 for sewing the sewing material with the thicker thickness or the sewing material with the harder material, whereas, the double needle rotary head pattern sewing machine 60 needs to decrease the distance between the two needles 66 for sewing the sewing material with the thinner thickness or the sewing material with the softer material, therefore, when the double needle rotary head pattern sewing machine 60 sews the sewing material with the different cloth conditions, the operator needs to manually replace the needle clamp 65 and the needle plate 67 in the state that the double needle rotary head pattern sewing machine 60 stops operating, and further, when the double needle rotary head pattern sewing machine 60 intends to sew another kind of sewing material, the operator needs to spend time to replace the needle clamp 65 and the needle plate 67, and it is difficult to improve the production efficiency.

Even, the pattern sewing machine 60 with the double needle rotating head cannot form a single stitch on the surface of the sewing material at the same time, and further, if a single stitch is to be formed on the surface of the sewing material, an operator must detach one of the needles or use the pattern sewing machine with the single needle rotating head, and thus, the use of the pattern sewing machine 60 with the double needle rotating head is limited by the number of the existing needles.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to improve the connection relation between a needle bar and two machine needles, so that one machine needle can move transversely and can move back to a sewing position, further, a transverse spacing distance between the two machine needles can be selectively increased or shortened by a double-needle sewing machine, and the double-needle sewing machine can also selectively use the two machine needles or a single machine needle to perform sewing operation.

The secondary objective of the present invention is that when one of the needles moves, the corresponding inner pressing pins move synchronously, so that the spacing distance between the two inner pressing pins is the same as the spacing distance between the two needles, even the thread hooking rod moves simultaneously, so that the thread hooking rod can continuously align with the moving needle.

To achieve the above object, the present invention provides a two-needle sewing machine with a variable needle pitch, comprising: the needle connecting frame can synchronously move up and down with the needle bar, and is provided with a needle fixing frame connected with the needle bar and a needle movable frame movably arranged on the needle fixing frame, the needle fixing frame is provided with a fixed needle, and the needle movable frame is provided with movable needles transversely arranged at intervals on the fixed needle.

However, the needle position switching device can drive the movable needle frame to move relative to the needle fixing frame, so that the movable needle can be switched between a sewing position aligned with the fixed needle height and a needle withdrawing position higher than the fixed needle height, and the needle pitch adjusting device can drive the movable needle frame to move transversely relative to the needle fixing frame, so that the horizontal spacing distance between the fixed needle and the movable needle can be changed.

In this embodiment, the needle moving frame has a horizontal moving seat and a longitudinal moving seat, the horizontal moving seat is connected between the moving needle and the longitudinal moving seat, the horizontal moving seat can move horizontally relative to the longitudinal moving seat through the needle pitch adjusting device, and the longitudinal moving seat is movably connected to the needle fixing frame, so that the longitudinal moving seat drives the horizontal moving seat to move longitudinally through the needle position switching device.

In this embodiment, the needle position switching device includes: an income needle positioning mechanism, one move back needle spring, one go into needle canceling mechanical system, one move back needle positioning mechanism and one move back needle canceling mechanical system, wherein, go into needle positioning mechanism have a pin joint in the income needle setting element of eedle mount and simultaneously connect in go into the needle setting element with the income needle spring of eedle mount, it is used for letting to go into the needle spring go into the needle setting element and keep in a sewing holding position, make go into the needle setting element can contradict in the eedle adjustable shelf, in addition, move back needle spring both ends simultaneously respectively in the eedle mount with the eedle adjustable shelf, and it is used for letting to move back the needle spring the eedle adjustable shelf can contact in go into the needle setting element, make the eedle adjustable shelf can't for the eedle mount removes, and then lets the activity eedle keep in the sewing position.

In addition, the needle-entering releasing mechanism can push the needle-entering positioning piece to enable the needle-entering positioning piece to move from the sewing maintaining position to a sewing separating position which is not contacted with the needle moving frame, so that the movable needle moves to the needle withdrawing position through the needle withdrawing spring, the needle withdrawing positioning mechanism is connected with the needle fixing frame, the needle withdrawing positioning mechanism is provided with a needle withdrawing stop block which can move relative to the needle fixing frame and a positioning spring which can push the needle withdrawing stop block, the positioning spring is used for keeping the needle withdrawing stop block at a needle withdrawing maintaining position which is contacted with the needle moving frame, so that the needle moving frame can not move relative to the needle fixing frame, and the movable needle is continuously positioned at the needle withdrawing position, furthermore, the needle withdrawing releasing mechanism is provided with a returning pushing piece which can move relative to the needle connecting frame, the needle movable frame can be blocked by the returning pushing piece and cannot move along with the needle fixed frame, so that when the needle connecting frame moves upwards through the needle bar, the needle fixed frame can move relative to the needle movable frame, and meanwhile, the needle inserting positioning piece returns to the sewing keeping position from the sewing separating position through the needle inserting spring.

In a preferred embodiment, the needle withdrawing release mechanism further includes a returning contact member capable of moving synchronously with the returning contact member and a returning driving member connected to the headstock, the returning contact member is located at the needle withdrawing stop, and the returning driving member drives the returning contact member and the returning contact member to move simultaneously, so that the returning contact member can drive the needle withdrawing stop to move to a needle withdrawing release position separated from the needle moving frame, and the returning contact member contacts the needle moving frame to limit the needle moving frame from moving.

In a preferred embodiment, the needle insertion release mechanism has a needle insertion release driving assembly connected to the headstock, a movable release assembly and a needle disengagement preventing assembly connected to the release assembly, and the needle insertion release driving assembly can simultaneously drive the release assembly and the needle disengagement preventing assembly to move, so that the needle disengagement preventing assembly contacts with the needle moving frame to ensure that the movable needle is positioned at the needle disengagement position.

The needle entering positioning mechanism can synchronously move up and down with the needle connecting frame, so that the area range where the needle entering positioning piece passes is set as a sewing removing area, the needle entering removing driving assembly drives the removing moving assembly to move into the sewing removing area, the needle entering positioning piece can be in contact with the removing moving assembly through the needle connecting frame which moves, and then the needle entering positioning piece can move to the sewing separating position.

In addition, anticreep position subassembly have one connect in remove the anticreep position connecting plate of removal subassembly and a pin joint in the anticreep position rotor plate of anticreep position connecting plate, anticreep position rotor plate through one connect in remove the anticreep position spring of removal subassembly and can for the anticreep position connecting plate swings, makes one connect in the anticreep position unit of anticreep position rotor plate can the sustained contact in the eedle adjustable shelf, wherein, anticreep position unit and withdraw of the needle positioning mechanism distribute in the high position of difference, make anticreep position unit and withdraw of the needle positioning mechanism contact respectively in the different positions of eedle adjustable shelf.

In a preferred embodiment, an area range through which the needle movable frame longitudinally moves is set as a movable frame area, when the needle entering positioning piece is switched between the sewing separation position and the sewing holding position, a part of the needle entering positioning piece can be selectively moved into or out of the movable frame area, wherein when the needle withdrawing stopper is located at the needle withdrawing holding position through the positioning spring, the needle withdrawing stopper is located inside the movable frame area, and when the needle withdrawing stopper is located at the needle withdrawing holding position through the positioning spring, the needle withdrawing stopper is located inside the movable frame area.

In a preferred embodiment, the needle pitch adjusting device has a needle pitch driving mechanism connected to the headstock, a needle pitch changing mechanism connected to the needle pitch driving mechanism, and a needle synchronizing mechanism located between the needle pitch changing mechanism and the transverse movable seat, the needle pitch changing mechanism is driven by the needle pitch driving mechanism to move the needle movable frame along a transverse axis perpendicular to the needle bar through the needle synchronizing mechanism, and the needle synchronizing mechanism is used for enabling the upper needle movable frame to move longitudinally relative to the needle pitch changing mechanism.

The needle pitch changing mechanism is provided with a needle pitch adjusting rod penetrating through the needle bar, a needle pitch changing assembly capable of converting rotary motion into linear motion, and a needle pitch adjusting plate located between the needle pitch changing assembly and the needle synchronizing mechanism, wherein the needle pitch adjusting plate can move relative to the needle fixing frame, and the needle pitch adjusting rod can rotate through the needle pitch driving mechanism, so that the rotating adjusting rod drives the needle pitch adjusting plate to move through the needle pitch changing assembly.

However, the needle synchronization mechanism has a needle synchronization guide groove parallel to the longitudinal axis and a needle synchronization boss movable inside the needle synchronization guide groove, one of the needle synchronization guide groove and the needle synchronization boss is formed on the needle pitch adjustment plate, and the other of the needle synchronization guide groove and the needle synchronization boss is formed on the needle movable frame.

In a preferred embodiment, the headstock is further provided with an inner presser foot bar capable of moving up and down through the upper shaft and an inner presser foot connecting frame capable of synchronously moving up and down with the inner presser foot bar, the inner presser foot connecting frame is provided with an inner presser foot fixing frame connected with the inner presser foot bar and an inner presser foot movable frame movably connected with the inner presser foot fixing frame, the inner presser foot movable frame is connected with an inner presser foot adjusting device assembled on the needle pitch adjusting rod, and when the spacing distance between the fixed needle and the movable needle is increased or decreased by the needle pitch adjusting device, the inner presser foot adjusting device drives the inner presser foot movable frame to move through the needle pitch adjusting rod, the movable inner presser foot assembled on the inner presser foot movable frame can be close to or far away from a fixed inner presser foot assembled on the inner presser foot fixing frame.

The inner presser foot adjusting device is provided with an inner presser foot adjusting rod penetrating through the inner presser foot rod and an inner presser foot transmission assembly capable of converting rotary motion into linear motion, the inner presser foot adjusting rod is connected to the stitch length adjusting rod through an inner presser foot linkage assembly, so that the inner presser foot linkage assembly drives the inner presser foot adjusting rod to rotate through the stitch length adjusting rod, the inner presser foot transmission assembly is positioned between the inner presser foot adjusting rod and the inner presser foot movable frame and can drive the inner presser foot movable frame to move through the inner presser foot adjusting rod which rotates, in the best embodiment, the inner presser foot linkage assembly is used for changing the rotation direction, and the stitch length adjusting rod and the inner presser foot adjusting rod can rotate towards opposite directions through the inner presser foot linkage assembly.

The inner presser foot linkage assembly is driven by the needle pitch adjusting rod and can drive the inner presser foot adjusting rod to rotate through the inner presser foot synchronization assembly, so that the needle pitch adjusting rod and the inner presser foot adjusting rod can rotate synchronously, and the inner presser foot synchronization assembly is used for enabling the inner presser foot adjusting rod to move relative to the inner presser foot linkage assembly.

In a preferred embodiment, the headstock has a hook connecting frame pivotally connected to the headstock and a hook rod connected to the hook connecting frame, the hook connecting frame is connected to the needle pitch adjusting device through a hook adjusting device, the hook rod is aligned to the movable needle, and when the spacing distance between the fixed needle and the movable needle is increased or decreased by the needle pitch adjusting device, the hook adjusting device drives the hook connecting frame to rotate through the needle pitch adjusting device, so that the hook rod is continuously aligned to the movable needle.

The thread hooking adjusting device is provided with a thread hooking adjusting rod capable of rotating through the needle pitch adjusting device and a thread hooking connecting piece pivoted to the thread hooking connecting frame, the thread hooking adjusting rod is connected to a thread hooking transmission assembly pivoted with the thread hooking connecting piece, the thread hooking transmission assembly can convert rotary motion into linear motion, the thread hooking adjusting rod capable of rotating can drive the thread hooking connecting piece to move through the thread hooking transmission assembly, and then the thread hooking connecting piece swings relative to the thread hooking connecting frame to enable the thread hooking connecting frame to rotate.

The utility model is characterized in that a needle bar is connected with a fixed needle and a movable needle through a needle connecting frame, and the needle movable frame of the needle connecting frame is movably connected with a needle fixing frame of the needle connecting frame, so that the needle movable frame can drive the movable needle to move in different directions relative to the needle fixing frame, therefore, the movable needle can move transversely through a needle distance changing mechanism and can also move back from a sewing position through a needle position switching device, further, the transverse spacing distance between the fixed needle and the movable needle can be increased or shortened, and the double-needle sewing machine can selectively use the fixed needle and the movable needle to perform sewing operation or only use the fixed needle to perform sewing operation simultaneously.

In addition, the inner presser foot adjusting device and the thread hooking adjusting device are both connected to the needle distance adjusting device, so that when the needle distance adjusting device drives the movable machine needle to move transversely, the needle distance adjusting device can drive the inner presser foot adjusting device and the thread hooking adjusting device simultaneously, the inner presser foot adjusting device can drive the movable inner presser foot to be close to or far away from the fixed inner presser foot, the spacing distance between the movable machine needle and the fixed machine needle can be continuously the same as the spacing distance between the movable inner presser foot and the fixed inner presser foot, and even the thread hooking adjusting device drives the thread hooking rod to rotate through the needle distance adjusting device, and the thread hooking rod is continuously aligned to the movable machine needle.

Drawings

FIG. 1A is a perspective view of a conventional double needle rotary head pattern sewing machine;

FIG. 1B is a schematic view of a conventional two-needle sewing machine in which two needles are connected to a needle bar via needle clips;

FIG. 2 is a perspective view of the two-needle sewing machine of the present invention;

FIG. 3 is a schematic view of the needle bar driving device, the needle bar device, the inner presser foot device and the thread hooking device all mounted on the head;

FIG. 4 is a schematic view of the needle bar device and the inner presser foot device connected to the needle bar driving device;

FIG. 5 is a schematic view of the needle attachment frame attached to a needle bar;

FIG. 6 is a schematic view of the inner presser foot attachment frame attached to the inner presser foot bar;

FIG. 7 is a schematic view of a thread hooking device;

FIG. 8A is a schematic view of the needle pitch adjusting device disposed on the needle bar mechanism;

FIG. 8B is a schematic view of the needle pitch varying mechanism disposed on the needle bar mechanism;

FIG. 8C is a schematic view of the needle bar synchronization assembly;

FIG. 9A is a schematic view of a needle position switching device;

FIG. 9B is a schematic view of the needle retracting spring and the needle inserting positioning mechanism mounted on the needle connecting frame;

FIG. 9C is an exploded view of the needle insertion release mechanism;

FIG. 9D is a schematic view of the needle retracting positioning mechanism;

FIG. 9E is an exploded view of the needle retraction release mechanism;

FIG. 10A is a schematic view of the connection between the inner presser foot adjustment device and the needle pitch adjustment device;

FIG. 10B is a schematic view of the inner press pin adjusting device connected to the inner press pin connecting frame;

FIG. 10C is a schematic view of the inner presser foot synchronization assembly;

FIG. 11 is a schematic view of a thread hooking adjustment device;

fig. 12A to 12C are schematic views illustrating increasing the distance between the fixed needle and the movable needle;

fig. 12D to 12F are schematic views illustrating shortening of the distance between the fixed needle and the movable needle;

fig. 13A and 13B are schematic views illustrating increasing the distance between the fixed inner presser foot and the movable inner presser foot;

fig. 13C and 13D are schematic views of shortening the distance between the fixed inner presser foot and the movable inner presser foot;

fig. 14A and 14B are schematic views illustrating the thread hooking adjusting device driving the thread hooking rod to swing;

FIG. 15A is a schematic view of the movable needle in the sewing position;

FIG. 15B is a schematic view of the release guide plate inside the stitching release area;

FIG. 15C is a schematic view of the needle insertion positioning element contacting the release guide plate;

FIG. 15D is a schematic view of the needle insertion positioning element being swung from the stitch hold position to the stitch release position;

FIG. 15E is a schematic view of the needle carriage being moved along the longitudinal axis by the needle retract spring;

FIG. 15F is a schematic view of the anti-dislocation stop block moving to the anti-dislocation return position;

FIG. 15G is a schematic view of the needle withdrawing stop moving to the needle withdrawing release position;

FIG. 15H is a schematic view of the movable needle in the needle withdrawing position;

FIG. 16A is a schematic view of the longitudinal movable seat between the needle withdrawing block and the anti-dislocation block;

FIG. 16B is a schematic view of the needle bar moving downward to position the upper contact plate above the needle withdrawal stop;

fig. 17A is a schematic view of the side contact plate being lower in height than the return abutting member;

fig. 17B is a schematic view of the side contact plate being positioned directly below the homing push-against member;

FIG. 17C is a schematic view of the needle holder being movable relative to the needle carriage by a needle bar; and

FIG. 17D is a schematic view of the needle insertion positioning element swinging to a stitch holding position.

Description of reference numerals: 1-two-needle sewing machine; 10-sewing machine body; 11-vehicle head; 12-needle bar drive means; 121-upper axis; 122-crankshaft connecting rod; 13-a needle bar device; 131-a needle bar; 132-needle connecting frame; 132 a-needle holder; 132a 1-upper fixed arm; 132a 2-lower fixed arm; 132a 3-side securing arms; 132a 4-fixture space; 132a 5-longitudinal guide posts; 132a 6-connecting arm; 132a 7-transverse guide post; 132 b-a needle moving frame; 132b 1-transverse movable seat; 132b 2-longitudinal sliding seat; 133-a fixed seat; 134-fixing the needle; 135-movable needle; 136-an upper contact plate; 137-side contact plate; 14-inner presser foot device; 141-internal pressure foot bar; 142-inner press leg connecting frame; 142 a-inner presser foot fixing frame; 142 b-inner press pin movable frame; 143-inner presser foot linkage; 144-fixed inner presser foot; 145-movable inner presser foot; 15-a thread hooking device; 151-hook line connecting frame; 151 a-swing frame; 151 b-a pivoting frame; 152-hook line rod; 153-hook driving component; 153 a-hook drive source; 153 b-hook telescopic rod; 153 c-hook transmission member; 20-a needle pitch adjusting device; 21-a gauge change mechanism; 211-gauge adjustment lever; 212-gauge change assembly; 212 a-gauge gear; 212 b-gauge rack; 212 c-gauge adjustment plate; 22-gauge drive mechanism; 221-gauge drive source; 222-a gauge drive assembly; 222 a-driving pitch gear; 222 b-driven gauge gear; 222 c-relay gear; 222 d-a base; 223-needle bar synchronizing assembly; 223 a-needle bar synchronous sliding chute; 223 b-needle bar synchronous convex column; 23-a needle synchronization mechanism; 231-needle synchronous guide groove; 232-needle synchronous convex column; 30-needle position switching device; 31-needle withdrawing spring; 32-a needle insertion positioning mechanism; 321-inserting needle positioning piece; 321 a-a positioning connection; 321 b-a locating abutment; 321 c-a guide; 322-a needle insertion spring; 33-needle insertion release mechanism; 331-needle insertion release drive assembly; 331 a-release drive source; 331 b-releasing the telescoping rod; 332-release of the moving assembly; 332 a-release plate; 332 b-release guide plate; 333-anti-dislocation component; 333 a-anti-dislocation connecting plate; 333 b-anti-dislocation rotating plate; 333 c-anti-dislocation spring; 333 d-anti-dislocation unit; 333d 1-stop slide mount; 333d 2-anti-dislocation stop block; 333d 3-anti-dislocation stop spring; 333d 4-anti-dislocation guide slope; 34-a needle withdrawing positioning mechanism; 341-positioning block sliding seat; 342-needle withdrawing block; 343-a positioning spring; 344 — release the transfer; 345-homing delivery column; 346-auxiliary positioning spring; 35-needle withdrawing releasing mechanism; 351-homing drive assembly; 351 a-homing drive source; 351 b-a homing telescoping rod; 352-homing moving assembly; 352 a-homing connection plate; 352 b-Return to touch; 352 c-homing push-against; 40-inner presser foot adjusting device; 41-inner press foot adjusting rod; 42-inner presser foot drive assembly; 421-inner presser foot gear; 422-inner press pin rack; 43-inner press pin linkage component; 431-active inner presser foot gear; 432-driven internal presser foot gear; 433-fitting a column; 44-inner presser foot synchronizing assembly; 441-inner presser foot synchronous groove; 442-inner press pin synchronous convex column; 50-a hook adjusting device; 51-hook line adjusting rod; 52-a hook transmission assembly; 521-a thread-hooking gear; 522-hook rack; 523-hook line pivoting plate; 53-hook line connecting piece; a 1-stitch hold position; a 2-stitch separation position; b1-sewing position; b2-needle withdrawing position; c1-needle withdraw holding position; c2-needle withdrawal release position; d1-anti-unseating separation position; d2-anti-dislocation return position; l1-transverse axis; l2-longitudinal axis; r1-shelf area; r2-stitch release area; 60-double needle rotating head pattern sewing machine; 61-a head rotation unit; 62-a base rotation unit; a 63-X-Y axis feeding unit; 64-needle bar; 65-needle clip; 66-machine needle; 67-needle plate; 671 pinhole.

Detailed Description

The utility model will be further described with reference to specific embodiments and drawings, the advantages and features of which will become apparent as the description proceeds.

Referring to fig. 2 and 3, the two-needle sewing machine 1 with variable needle pitch and needle number of the present invention has a sewing machine body 10, the sewing machine body 10 has a head 11, a pillar (not shown) and a base (not shown), the head 11 has a needle bar driving device 12, a needle bar device 13 and an inner presser 14 inside, and the head 11 has a thread hooking device 15 outside, wherein the head 11 further has a needle pitch adjusting device 20, a needle position switching device 30, an inner presser adjusting device 40 and a thread hooking adjusting device 50, in this embodiment, the head 11 is pivoted to the pillar, so that the head 11 can rotate relative to the pillar, and when the head 11 rotates, the needle bar driving device 12, the needle bar device 13, the inner presser 14, the thread hooking device 15, the needle pitch adjusting device 20, the needle position switching device 30, a thread position switching device 15, a thread hooking device 20, a thread position switching device 30, a thread position switching device 15, a thread hooking device, and a thread hooking device 15 are mounted on the head 11, The inner presser foot adjusting device 40 and the thread hooking adjusting device 50 both rotate synchronously with the head 11, and the base body is provided with two pot tables (not shown) capable of rotating synchronously with the head 11, each of the pot tables is provided with a needle plate (shown in figure) having a needle hole and a rotating shuttle (not shown in figure), in this embodiment, one of the pot tables is a fixed pot table with the needle hole aligned with the rotation center of the head 11, and the other pot table can move relative to the fixed pot table to be a movable pot table.

Referring to fig. 3 and 4, the needle bar driving device 12 includes a needle bar driving source (not shown) fixed to the head 11 and an upper shaft 121 located inside the head 11, the upper shaft 121 is driven by the needle bar driving source to rotate, and one end of the upper shaft 121 is mounted with a crank shaft connecting rod 122 to connect to the needle bar device 13.

Referring to fig. 4 and 5, the needle bar device 13 has a hollow needle bar 131, the needle bar 131 is vertically disposed on the head 11 of the sewing machine body 10, and the needle bar 131 is connected to the crank shaft link 122 of the needle bar driving device 12, so that the upper shaft 121 of the needle bar driving device 12 is driven by the needle bar driving source to drive the needle bar 131 to move up and down, wherein a needle connecting frame 132 is disposed at the lower end of the needle bar 131, in this embodiment, the needle connecting frame 132 has two parts, namely a needle fixing frame 132a and a needle moving frame 132b, the upper and lower sides of the needle fixing frame 132a are respectively provided with a transversely arranged upper fixing arm 132a1 and a lower fixing arm 132a2 parallel to the upper fixing arm 132a1, the upper fixing arm 132a1 is connected to the lower end of the needle bar 131, so that the needle connecting frame 132 can move up and down synchronously with the needle bar 131, and the opposite ends of the upper fixing arm 132a1 respectively extend to form a longitudinally arranged side 132a3 to be connected to the fixing arm 3 The lower fixing arm 132a2, such that the upper fixing arm 132a1, the lower fixing arm 132a2 and the two side fixing arms 132a3 surround to form a fixing frame space 132a4, and the lower fixing arm 132a2 mounts a fixing seat 133 outside the fixing frame space 132a4 and a fixing needle 134 connected to the fixing seat 133, and the fixing needle 134 is aligned with the needle hole of the fixing kettle table, as shown, the upper and lower fixing arms 132a1, 132a2 both connect two longitudinal guide posts 132a5 inside the fixing frame space 132a4, and two longitudinal guide posts 132a5 are parallel to the side fixing arm 132a3, however, each side fixing arm 132a3 connects a6 outside the fixing frame space 132a4, and two connecting arms 132a6 connect a transverse guide post 132a7 outside the fixing frame space 132a4, wherein the transverse guide post 132a7 is located above the fixing seat 133, the lateral guide post 132a7 is vertically disposed on the longitudinal guide post 132a 5.

As shown in fig. 5, the needle moving frame 132b of the needle connecting frame 132 has a transverse moving seat 132b1 and a longitudinal moving seat 132b2, the transverse moving seat 132b1 is connected to a moving needle 135 transversely spaced from the fixed needle 134, and the transverse moving seat 132b1 is movably connected to the longitudinal moving seat 132b2 in a sliding-rail sliding-groove connection manner, so that the transverse moving seat 132b1 can move along a transverse axis L1 perpendicular to the needle bar 131 with respect to the longitudinal moving seat 132b2, and the moving needle 135 can move transversely with respect to the longitudinal moving seat 132b2 through the transverse moving seat 132b1, and the moving needle 135 is aligned with the needle hole of the moving kettle table, and in addition, the longitudinal moving seat 132b2 is movably connected to two longitudinal guide posts 132a5 of the needle fixing frame 132a, so that the longitudinal moving seat 132b2 can move along a longitudinal axis L2 parallel to the needle bar 131 with respect to the needle fixing frame 132a, the movable needle 135 is driven by the transverse movable seat 132b1 to move longitudinally through the longitudinally movable seat 132b2, wherein an upper contact plate 136 is mounted on the upper surface of the longitudinally movable seat 132b2, and a side contact plate 137 spaced from the upper contact plate 136 is mounted on the side surface of the longitudinally movable seat 132b2, and the upper contact plate 136 and the side contact plate 137 are respectively located on opposite sides of the needle holder 132a, such that the upper contact plate 136 and the side contact plate 137 are both located outside the holder space 132a4 of the needle holder 132a, in this embodiment, since the longitudinally movable seat 132b2 is movably connected to the two longitudinal guide posts 132a5, the region through which the needle movable holder 132b moves along the longitudinal axis L2 is set as a movable holder region R1 located inside the holder space 132a 4.

Referring to fig. 4 and 6, the inner presser foot device 14 has an inner presser foot bar 141 disposed in parallel on the needle bar 131 and an inner presser foot link 142 connected to the inner presser foot bar 141, and the inner presser foot bar 141 is connected to the upper shaft 121 of the needle bar driving device 12 through an inner presser foot link 143, so that when the needle bar driving source of the needle bar driving device 12 drives the upper shaft 121 to rotate, the inner presser foot link 143 can drive the inner presser foot bar 141 to move up and down, so that the inner presser foot link 142 can move up and down synchronously with the inner presser foot bar 141, as shown in the figure, the inner presser foot link 142 is close to the needle link 132 of the needle bar device 13, and the inner presser foot link 142 mainly comprises an inner presser foot fixing frame 142a and an inner presser foot movable frame 142b, wherein the inner presser foot fixing frame 142a is mounted with a fixed inner presser foot 144, and the inner presser foot fixing frame 142a is connected to the inner presser foot bar 141, the inner presser foot movable frame 142b is mounted with a movable inner presser foot 145 spaced from the fixed inner presser foot 144, wherein the inner presser foot movable frame 142b is movably connected to the inner presser foot fixed frame 142a so that the inner presser foot movable frame 142b can move laterally with respect to the inner presser foot fixed frame 142a, and further the movable inner presser foot 145 can move along the lateral axis L1 by the moving inner presser foot movable frame 142 b.

Referring to fig. 3 and 7, the thread hooking device 15 is mainly composed of a thread hooking link frame 151, a thread hooking rod 152, and a thread hooking driving assembly 153, the thread hooking link frame 151 has a swing frame 151a connected to the thread hooking rod 152 and a pivot frame 151b pivoted to the head 11, the swing frame 151a is pivoted to the pivot frame 151b so that the swing frame 151a can swing with respect to the pivot frame 151b, the thread hooking rod 152 can move away from or close to the movable needle 135 of the needle bar device 13 through the swinging swing frame 151a, as shown in the figure, the thread hooking driving assembly 153 is provided with a thread hooking driving source 153a provided as a pneumatic cylinder and a thread hooking telescopic rod 153b capable of moving linearly through the thread hooking driving source 153a, the thread hooking rod 153a is connected to the pivot frame 151b, and the thread hooking telescopic rod 153b is connected to a group of thread hooking transmission members 153c installed on the swing frame 151a, so that the hooking driving source 153a can drive the swing frame 151a to swing.

Referring to fig. 8A and 8B, the needle pitch adjusting device 20 includes a needle pitch varying mechanism 21, a needle pitch driving mechanism 22 and a needle synchronizing mechanism 23, the needle pitch varying mechanism 21 includes a needle pitch adjusting rod 211 arranged longitudinally and a needle pitch varying assembly 212 connected to the needle pitch adjusting rod 211, the needle pitch adjusting rod 211 is inserted into the needle bar 131 of the needle bar device 13, the needle pitch adjusting rod 211 is located inside the needle bar 131, the needle pitch adjusting rod 211 can rotate relative to the needle bar 131, the needle pitch varying assembly 212 is disposed above the needle connecting frame 132 of the needle bar device 13, the needle pitch varying assembly 212 is located between the needle pitch adjusting rod 211 and the movable needle 135 of the needle bar device 13, in this embodiment, the needle pitch varying assembly 212 can convert the rotational motion into the linear motion, and the needle pitch varying assembly 212 includes a needle pitch gear 212a fixed to the end of the needle pitch adjusting rod 211 and a needle pitch rack gear 212a engaged with the needle pitch gear 212a 212b, wherein the pitch gear 212a is located inside the holder space 132a4 of the needle attachment holder 132, and further, the pitch rack 212b is movably connected to the lateral guide post 132a7 of the needle holder 132a such that the pitch rack 212b is located outside the holder space 132a4, and the pitch rack 212b is connected to a pitch adjustment plate 212c which is mutually assembled with the needle synchronization mechanism 23.

As shown in fig. 8A and 8B, the needle pitch driving mechanism 22 has a needle pitch driving source 221 capable of generating a rotational power and a needle pitch transmission assembly 222 connected to the needle pitch driving source 221, the needle pitch driving source 221 is fixedly connected to the head 11 of the sewing machine body 10, and the needle pitch driving source 221 is installed at one side of the needle bar 131 of the needle bar device 13, and the needle pitch transmission assembly 222 has a driving needle pitch gear 222a connected to the needle pitch driving source 221 and a driven needle pitch gear 222B connected to the needle pitch changing mechanism 21, wherein the driving needle pitch gear 222a is engaged with the driven needle pitch gear 222B via a relay gear 222c, and a base 222d located above the needle bar 131 is installed above the driven needle pitch gear 222B, as shown in the drawings, a needle bar synchronizing assembly 223 is provided between the base 222d and the needle pitch adjusting rod 211 of the needle pitch changing mechanism 21 to allow the needle pitch adjusting rod 211 to move up and down with respect to the driven needle pitch gear 222B, in this embodiment, the needle bar synchronization assembly 223 is further capable of rotating the driven pitch gear 222b and the pitch adjustment lever 211 in synchronization.

Referring to fig. 8C, the needle bar synchronization assembly 223 includes a needle bar synchronization sliding slot 223a and a needle bar synchronization convex column 223b, wherein the needle bar synchronization sliding slot 223a is formed on the base 222d of the needle pitch transmission assembly 222, the needle bar synchronization sliding slot 223a is disposed in parallel to the needle pitch adjustment rod 211 of the needle pitch variation mechanism 21, and the needle bar synchronization convex column 223b is a roller connected to a side surface of the needle pitch adjustment rod 211, wherein the needle bar synchronization convex column 223b is disposed through the needle bar synchronization sliding slot 223a, and the needle bar synchronization convex column 223b contacts a wall surface of the needle bar synchronization sliding slot 223a in a line contact manner, so that when the upper shaft 121 of the needle bar driving device 12 drives the needle bar 131 of the needle bar device 13 to move up and down, the needle bar synchronization convex column 211 moves up and down synchronously with the needle bar 131, and the needle bar synchronization convex column 223b moves inside the needle bar synchronization sliding slot 223a, the needle pitch adjusting rod 211 moves up and down relative to the driven needle pitch gear 222b of the needle bar synchronizing assembly 223, however, the needle bar synchronizing slide groove 223a is formed on the base 222d and the needle bar synchronizing convex column 223b is formed on the needle pitch adjusting rod 211 for convenience of description, that is, the needle pitch adjusting rod 211 can be recessed to form the needle bar synchronizing slide groove 223a, and the base 222d can be installed with the needle bar synchronizing convex column 223b as a roller.

Referring to fig. 8A and 8B, the needle synchronization mechanism 23 of the needle pitch adjustment device 20 is disposed between the needle pitch adjustment plate 212c of the needle pitch adjustment device 20 and the transverse movable seat 132B1 of the needle movable frame 132B, and the needle synchronization mechanism 23 is configured to enable the needle movable frame 132B of the needle connecting frame 132 to move relative to the needle pitch adjustment plate 212c, wherein the needle synchronization mechanism 23 has a needle synchronization guide slot 231 and a needle synchronization stud 232, the needle synchronization guide slot 231 is parallel to the longitudinal axis L2, the needle synchronization guide slot 231 forms the needle pitch adjustment plate 212c, the needle synchronization stud 232 is connected to the transverse movable seat 132B1, and the needle synchronization stud 232 is disposed inside the needle synchronization guide slot 231, such that the needle synchronization stud 232 contacts the wall surface of the needle synchronization guide slot 231 in a line contact manner.

Referring to fig. 9A and 9B, the needle position switching device 30 includes a needle withdrawing spring 31, a needle inserting positioning mechanism 32, a needle inserting releasing mechanism 33, a needle withdrawing positioning mechanism 34, and a needle withdrawing releasing mechanism 35, wherein one end of the needle withdrawing spring 31 is connected to the needle holder 132a of the needle connecting frame 132, and the other end of the needle withdrawing spring 31 is connected to the longitudinal movable seat 132B2 of the needle movable frame 132B, such that the needle withdrawing spring 31 is located between the needle holder 132a and the needle movable frame 132B, and the needle withdrawing spring 31 is located inside the holder space 132a4 of the needle holder 132a, in this embodiment, when two ends of the needle withdrawing spring 31 are respectively connected to the needle holder 132a and the longitudinal movable seat 132B2, both the needle holder 132a and the longitudinal movable seat 132B2 elongate the overall length of the needle withdrawing spring 31, such that the needle withdrawing spring 31 can apply an upward moving tension to the needle holder 132B, allowing the needle movable carriage 132b to move along the longitudinal axis L2 within the carriage space 132a 4.

Referring to fig. 9A and 9B, the needle inserting positioning mechanism 32 of the needle position switching device 30 is mounted on the needle connecting frame 132 of the needle bar device 13, and the needle inserting positioning mechanism 32 has a needle inserting positioning member 321 and a needle inserting spring 322, a portion of the needle inserting positioning member 321 is a positioning connecting portion 321a, and the remaining portion of the needle inserting positioning member 321 is a positioning abutting portion 321B extending from the positioning connecting portion 321a, wherein the positioning connecting portion 321a is provided with a guiding portion 321c having a column shape, a boundary between the positioning connecting portion 321a and the positioning abutting portion 321B is pivotally connected to the needle fixing frame 132a of the needle connecting frame 132, so that the needle inserting positioning member 321 can swing relative to the needle fixing frame 132a, an upper end of the needle inserting spring 322 is connected to the positioning connecting portion 321a, and a lower end of the needle inserting spring 322 is connected to a portion of the needle fixing frame 132a, when the needle inserting positioning element 321 and the needle fixing frame 132a are installed between the needle inserting positioning element 321 and the needle fixing frame 132a, the needle inserting positioning element 321 and the needle fixing frame 132a may extend the entire length of the needle inserting spring 322, so that the needle inserting positioning element 321 can be pulled by the needle inserting spring 322, the positioning abutting portion 321b can move into the fixing frame space 132a4 of the needle fixing frame 132a, and the positioning abutting portion 321b is located inside the movable frame region R1 of the needle movable frame 132b, as shown in the figure, since the needle inserting positioning mechanism 32 is installed on the needle connecting frame 132, the needle inserting positioning mechanism 32 can synchronously move up and down with the needle connecting frame 132, and the region range through which the needle inserting positioning element 321 passes is set as a sewing release region R2 adjacent to the movable frame region R1.

Referring to fig. 9A and 9C, the needle insertion release mechanism 33 of the needle position switching device 30 includes a needle insertion release driving unit 331, a release moving unit 332, and a disengagement preventing unit 333, the needle insertion release driving unit 331 includes a release driving source 331a configured as a pneumatic cylinder and a release telescopic rod 331b connected to the release moving unit 332, the release driving source 331a is connected to the head 11 of the sewing machine body 10, and the release telescopic rod 331b is connected to the release driving source 331a, so that the release telescopic rod 331b can drive the release moving unit 332 to move by the release driving source 331a, and as shown in the figure, the release moving unit 332 includes a release moving plate 332a connected to the release telescopic rod 331b and a release guiding plate 332b connected to the release moving plate 332 a.

As shown in the drawings, the anti-slip unit 333d of the needle-inserting releasing mechanism 33 has an anti-slip connecting plate 333a and an anti-slip rotating plate 333b, the anti-slip connecting plate 333a is connected to the releasing moving plate 332a of the releasing moving unit 332, and the anti-slip rotating plate 333b is pivotally connected to the anti-slip connecting plate 333a, so that the anti-slip rotating plate 333b can rotate relative to the anti-slip connecting plate 333a, wherein the anti-slip connecting plate 333a and the anti-slip rotating plate 333b are commonly connected to an anti-slip spring 333c, and the anti-slip connecting plate 333a and the anti-slip rotating plate 333b jointly extend the entire length of the anti-slip spring 333c, so that the anti-slip spring 333c can pull the anti-slip rotating plate 333b to swing the anti-slip rotating plate 333b, and in this embodiment, the anti-slip unit 333d has a sliding block 333d1 connected to the anti-slip rotating plate 333b and a sliding block 333d able to rotate relative to the anti-slip rotating plate 333b The anti-dislocation block 333d2 that the block sliding seat 333d1 moves, an anti-dislocation block spring 333d3 that can push the anti-dislocation block 333d2 is arranged between the block sliding seat 333d1 and the anti-dislocation block 333d2, and an anti-dislocation guide inclined surface 333d4 is arranged on one side of the anti-dislocation block 333d2 far from the anti-dislocation block spring 333d 3.

Referring to fig. 9A and 9D, the needle withdrawing positioning mechanism 34 of the needle position switching device 30 has a positioning block sliding seat 341 and a needle withdrawing stop 342, the positioning block sliding seat 341 is connected to one of the connecting arms 132a6 of the needle connecting frame 132, and the needle withdrawing stop 342 is movably connected to the positioning block sliding seat 341, so that the needle withdrawing stop 342 can move relative to the positioning block sliding seat 341, wherein a positioning spring 343 capable of pushing the needle withdrawing stop 342 is disposed between the positioning block sliding seat 341 and the needle withdrawing stop 342, as shown in the figure, the needle withdrawing stop 342 is connected to a releasing transmission member 344, and the releasing transmission member 344 contacts a returning transmission post 345 movably connected to the connecting arm 132a6, however, an auxiliary positioning spring 346 is disposed between the returning transmission post 345 and the connecting arm 132a6, the auxiliary positioning spring 346 can push the returning transmission post 345, so that the returning transmission post 345 can continuously contact the releasing transmission member 344 through the auxiliary positioning spring 346, in this embodiment, the height position of the needle withdrawing positioning mechanism 34 is higher than the anti-disengaging unit 333d of the anti-disengaging unit 333.

Referring to fig. 9A and 9E, the needle withdrawing releasing mechanism 35 of the needle position switching device 30 has a returning driving unit 351 and a returning moving unit 352, the returning driving unit 351 has a returning driving source 351a configured as a pneumatic cylinder and a returning telescopic rod 351b connected to the returning driving source 351a, the returning driving source 351a is connected to the head 11 of the sewing machine body 10, the height position of the returning driving source 351a is lower than the releasing driving source 331a of the needle withdrawing driving unit 331, and the returning driving source 351a can drive the returning telescopic rod 351b to move, however, the returning moving unit 352 has a returning connecting plate 352a connected to the returning telescopic rod 351b, and opposite sides of the returning connecting plate 352a are respectively connected to a returning contact 352b and a returning push-against piece 352c, wherein the returning contact 352b is opposite to the returning transmission column 345 located in the needle withdrawing positioning mechanism 34, and the pair of return abutments 352c are positioned on the side contact plate 137 of the needle connecting frame 132.

Referring to fig. 10A, 10B and 10C, the inner presser foot adjusting device 40 includes an inner presser foot adjusting rod 41 arranged in a longitudinal direction, an inner presser foot transmission assembly 42 for converting a rotational motion into a linear motion, an inner presser foot linkage assembly 43 for changing a rotational direction, and an inner presser foot synchronizing assembly 44 for moving the inner presser foot adjusting rod 41 relative to the inner presser foot linkage assembly 43, wherein the inner presser foot adjusting rod 41 is parallel to the needle pitch adjusting rod 211 of the needle pitch adjusting device 20, the inner presser foot adjusting rod 41 is inserted into the inner presser foot rod 141 of the inner presser foot device 14, such that the inner presser foot adjusting rod 41 is located inside the inner presser foot rod 141, the inner presser foot adjusting rod 41 is rotatable relative to the inner presser foot rod 141, and the inner presser foot transmission assembly 42 is disposed inside the inner presser foot connecting frame 142 of the inner presser foot device 14, in this embodiment, the inner presser foot transmission assembly 42 includes an inner presser foot gear 421 fixed to a distal end of the inner presser foot adjusting rod 41 and an inner presser foot gear wheel 421 and a inner presser foot gear wheel An inner presser rack 422 meshed with the inner presser gear 421, and the inner presser rack 422 is formed on the inner presser movable frame 142b of the inner presser link 142.

Furthermore, the inner presser foot linkage assembly 43 of the inner presser foot adjusting device 40 is located between the needle pitch adjusting rod 211 of the needle pitch adjusting device 20 and the inner presser foot adjusting rod 41 of the inner presser foot adjusting device 40, wherein the inner presser foot linkage assembly 43 has a driving inner presser foot gear 431 connected to the needle pitch adjusting rod 211 and a driven inner presser foot gear 432 meshed with the driving inner presser foot gear 431, and the driven inner presser foot gear 432 is connected to a sleeve column 433 sleeved to the inner presser foot adjusting rod 41, wherein the inner presser foot synchronizing assembly 44 is located between the inner presser foot adjusting rod 41 and the sleeve column 433, as shown in the figure, the inner presser foot synchronizing assembly 44 has an inner presser foot synchronizing groove 441 and an inner presser foot synchronizing boss 442, the inner presser foot synchronizing groove 441 is parallel to the inner presser foot adjusting rod 41, and the inner presser foot synchronizing groove 441 is formed in the sleeve column 433, and the inner presser foot synchronizing boss 442 is connected to the inner presser foot adjusting rod 41, the inner presser foot synchronization protrusion 442 is inserted into the inner presser foot synchronization groove 441, so that the inner presser foot synchronization protrusion 442 contacts the wall surface of the inner presser foot synchronization groove 441 in a line contact manner, and thus, when the inner presser foot rod 141 of the inner presser foot device 14 moves up and down through the upper shaft 121 of the needle rod driving device 12, the inner presser foot adjustment rod 41 moves up and down in synchronization with the inner presser foot rod 141, so that the inner presser foot synchronization protrusion 442 moves up and down in the inner presser foot synchronization groove 441, and the inner presser foot adjustment rod 41 can move up and down through the inner presser foot synchronization assembly 44 relative to the driven inner presser foot gear 432 of the inner presser foot linkage assembly 43.

Referring to fig. 11, the hook adjusting device 50 has a hook adjusting rod 51, a hook transmission assembly 52 and a hook connecting member 53, wherein the thread hooking adjusting rod 51 is parallel to the needle pitch adjusting rod 211 of the needle pitch adjusting device 20, the thread hooking adjusting rod 51 is connected to the relay gear 222c of the needle pitch driving mechanism 22, furthermore, the thread hooking adjusting rod 51 is connected to the thread hooking transmission component 52 at one end far away from the relay gear 222c, so that the relay gear 222c can drive the hook adjusting rod 51 to rotate, however, the hook transmission assembly 52 is used to convert the rotation motion into a linear motion, wherein the thread hooking transmission component 52 has a thread hooking gear 521 fixed on the thread hooking adjusting rod 51 and a thread hooking rack 522 meshed with the thread hooking gear 521, the thread hooking rack 522 is connected with a thread hooking pivoting plate 523 pivoted to the thread hooking connecting piece 53, the hook connecting member 53 is connected to the pivoting frame 151b of the hook connecting frame 151 at an end away from the hook pivoting plate 523.

Referring to fig. 12A, 12B and 12C, when the distance between the fixed needle 134 and the movable needle 135 is to be adjusted in the two-needle sewing machine 1, the needle pitch driving source 221 of the needle pitch driving mechanism 22 drives the driving needle pitch gear 222A of the needle pitch transmission assembly 222 to rotate counterclockwise, so that the driving needle pitch gear 222A drives the driven needle pitch gear 222B of the needle pitch transmission assembly 222 to rotate counterclockwise through the relay gear 222C of the needle pitch transmission assembly 222, at this time, because the needle bar synchronization convex column 223B of the needle bar synchronization assembly 223 penetrates through the needle bar synchronization sliding chute 223a of the needle bar synchronization assembly 223, the driven needle pitch gear 222B can drive the needle pitch adjustment rod 211 of the needle pitch change mechanism 21 to rotate relative to the needle bar 131 through the needle bar synchronization assembly 223, and further, the needle pitch gear 212A of the needle pitch change assembly 212 rotates counterclockwise with the needle bar 131 as the axis, causing the needle pitch rack 212B of the needle pitch changing assembly 212 to move along the lateral guide post 132a7 of the needle holder 132a, as shown in fig. 12B, since the needle synchronization post 232 of the needle synchronization mechanism 23 is located inside the needle synchronization guide slot 231 of the needle synchronization mechanism 23, so that the needle pitch adjustment plate 212c of the needle pitch changing mechanism 21 can bring the lateral movable seat 132B1 of the needle movable frame 132B to move laterally relative to the longitudinal movable seat 132B2 of the needle movable frame 132B via the needle synchronization mechanism 23, and the movable needle 135 of the needle connecting frame 132 can move along the lateral axis L1 through the moving lateral movable seat 132B1, so that the movable needle 135 can move away from the fixed needle 134 of the needle connecting frame 132 to increase the distance between the fixed needle 134 and the movable needle 135, as shown in fig. 12D, 12E and 12F, on the contrary, when the needle pitch driving source 221 drives the needle pitch adjusting rod 211 to rotate clockwise, the needle pitch gear 212a rotates clockwise around the needle bar 131 as the axis to drive the needle pitch rack 212b to move linearly along the transverse axis L1, so that the movable needle 135 can approach the fixed needle 134 to shorten the distance between the fixed needle 134 and the movable needle 135, and thus, in the process that the needle bar 131 is driven by the upper shaft 121 to move up and down, the needle pitch driving source 221 can drive the needle pitch adjusting rod 211 to rotate at any time to selectively increase or decrease the distance between the fixed needle 134 and the movable needle 135, in this embodiment, when the distance between the fixed needle 134 and the movable needle 135 is changed, the movable autoclave is driven by a pitch driving device assembled in the base to move, so that the needle plate and the rotary shuttle of the movable autoclave move synchronously along the transverse axis L1, the needle hole of the movable kettle table can be continuously aligned to the movable needle 135.

Referring to fig. 13A and 13B, when the needle pitch driving source 221 of the needle pitch driving mechanism 22 drives the needle pitch adjusting rod 211 of the needle pitch changing mechanism 21 to rotate counterclockwise, the driving inner presser gear 431 of the inner presser foot interlocking assembly 43 can drive the driven inner presser gear 432 of the inner presser foot interlocking assembly 43 to rotate clockwise through the needle pitch adjusting rod 211 rotating counterclockwise, at this time, because the inner presser foot synchronizing convex column 442 of the inner presser foot synchronizing assembly 44 is inserted into the inner presser foot synchronizing groove 441 of the inner presser foot synchronizing assembly 44, the driven inner presser gear 432 drives the inner presser foot adjusting rod 41 of the inner presser foot adjusting device 40 to rotate clockwise through the inner presser foot synchronizing assembly 44, and the inner presser foot gear 421 of the inner presser foot driving assembly 42 simultaneously rotates clockwise with the inner presser foot rod 141 as an axis, so that the inner presser foot rack 422 of the inner presser foot driving assembly 42 drives the inner presser foot movable frame 142B of the inner presser foot connecting frame 142 to move transversely and linearly, so that the movable inner presser foot 145 of the inner presser foot device 14 can be far away from the fixed inner presser foot 144 of the inner presser foot device 14 through the movable inner presser foot frame 142b, and the distance between the fixed inner presser foot 144 and the movable inner presser foot 145 can be the same as the distance between the fixed needle 134 and the movable needle 135, please refer to fig. 13C and 13D, on the contrary, when the needle distance driving source 221 drives the needle distance adjusting rod 211 to rotate clockwise, the driving inner presser foot gear 431 drives the inner presser foot adjusting rod 41 to rotate counterclockwise through the driven inner presser foot gear 432 and the inner presser foot synchronizing assembly 44, so that the inner presser foot gear 421 rotates counterclockwise with the inner presser foot bar 141 as the axis to drive the inner presser foot rack 422 to move linearly and transversely along the transverse axis L1, and the movable inner presser foot frame 142b drives the movable inner presser foot 145 to approach the fixed inner presser foot 144, in the process that the inner presser bar 141 is driven by the upper shaft 121 to move up and down, the stitch length driving source 221 can drive the inner presser adjusting rod 41 to rotate at any time so as to selectively increase or decrease the distance between the fixed inner presser 144 and the movable inner presser 145.

Referring to fig. 14A and 14B, when the needle pitch driving source 221 of the needle pitch driving mechanism 22 drives the relay gear 222c of the needle pitch transmission assembly 222 to rotate, the relay gear 222c drives the hook adjusting rod 51 of the hook adjusting device 50 to rotate, so that the hook gear 521 of the hook transmission assembly 52 rotates to drive the hook rack 522 of the hook transmission assembly 52 to move, the thread hooking link 53 of the thread hooking transmission assembly 52 moves synchronously via the moving thread hooking rack 522, so that the thread hooking link 53 drives the thread hooking link 151 to rotate relative to the head 11 of the sewing machine body 10, and the thread hooking rod 152 of the thread hooking device 15 is continuously aligned with the movable needle 135 of the needle bar device 13, in this embodiment, when the hook connecting piece 53 drives the hook connecting frame 151 to swing, the hook connecting piece 53 swings relative to the hook connecting frame 151 to change an included angle between the hook connecting piece 53 and the hook connecting frame 151.

Referring to fig. 15A, when the two-needle sewing machine 1 is to switch the movable needle 135 to a higher height position relative to the fixed needle 134, the needle bar driving source of the needle bar driving device 12 drives the upper shaft 121 of the needle bar driving device 12 to rotate, so that the rotating upper shaft 121 drives the needle bar 131 of the needle bar device 13 to move downwards through the crank shaft link 122 of the needle bar driving device 12, and the needle connecting frame 132 of the needle bar device 13 moves to a lowest position through the downwardly moving needle bar 131, as shown in the figure, because the height position of the needle movable frame 132b is lower than the positioning abutting portion 321b, the needle entering spring 322 of the needle entering positioning mechanism 32 pushes the needle entering positioning member 321 of the needle entering positioning mechanism 32 to rotate clockwise, so that the positioning abutting portion 321b of the needle entering positioning member 321 moves into the movable frame region R1, and the positioning abutting portion 321b is located at a seam holding position a1 to abut against the longitudinal movable seat 132b2 of the needle connecting frame 132, the longitudinal movable seat 132B2 of the needle movable frame 132B is close to the lower fixed arm 132a2 of the needle fixed frame 132a, at this time, the needle withdrawing spring 31 of the needle position switching device 30 is used to allow the needle movable frame 132B to contact the needle inserting positioning piece 321, so that the needle movable frame 132B cannot move up and down relative to the needle fixed frame 132a of the needle connecting frame 132, and the movable needle 135 of the needle bar device 13 is located at a sewing position B1, wherein when the movable needle 135 is located at the sewing position B1, the fixed needle 134 and the movable needle 135 are both located at the same height position, and in addition (as shown in fig. 15F), the positioning spring 343 of the needle withdrawing positioning mechanism 34 pushes the needle withdrawing block 342 of the needle withdrawing positioning mechanism 34 to move to the inside the movable frame region R1, so that the needle withdrawing block 342 can be continuously located at a needle withdrawing holding position C1 through the positioning spring 343.

Referring to fig. 15B, after the needle connecting frame 132 of the needle bar device 13 is located at the lowest position, the releasing driving source 331a of the needle inserting releasing mechanism 33 drives the releasing telescopic rod 331B of the needle inserting releasing driving assembly 331 to extend outward, so that the releasing moving assembly 332 of the needle inserting releasing mechanism 33 drives the anti-disengaging assembly 333 of the needle inserting releasing mechanism 33 to be away from the releasing driving source 331a, the releasing guide plate 332B of the releasing moving assembly 332 moves into the sewing releasing area R2 of the needle inserting positioning member 321, and the anti-disengaging stopper 333d2 of the anti-disengaging assembly 333 moves into the movable frame area R1.

Referring to fig. 15C, the needle bar driving source of the needle bar driving device 12 continuously drives the upper shaft 121 of the needle bar driving device 12 to rotate, so that the rotating upper shaft 121 drives the needle bar 131 of the needle bar device 13 to move upwards via the crankshaft link 122 of the needle bar driving device 12, and the needle connecting frame 132 of the needle bar device 13 and the needle inserting positioning mechanism 32 of the needle position switching device 30 synchronously move upwards with the needle bar 131, wherein when the needle inserting positioning mechanism 32 moves upwards, the needle inserting positioning member 321 of the needle inserting positioning mechanism 32 contacts with the releasing guide plate 332b of the releasing moving assembly 332, and the releasing guide plate 332b is located in the sewing releasing area R2 of the needle inserting positioning member 321, so that the guide portion 321C of the positioning connecting portion 321a touches the releasing guide plate 332b, and as shown in fig. 15D, the upper shaft continuously drives the needle connecting frame 132 to move upwards in a state that the positioning connecting portion 321a contacts with the releasing guide plate 332b The needle inserting positioning member 321 is swung counterclockwise relative to the needle holder 132a by releasing the guiding plate 332b, and the positioning abutting portion 321b of the needle inserting positioning member 321 is moved out of the sewing holding position a1 inside the movable frame region R1, so that the positioning abutting portion 321b is located at a sewing separating position a2 to be separated from the longitudinal movable seat 132b2 of the needle holder 132 b.

Referring to fig. 15E, when the positioning abutting portion 321b of the needle inserting positioning member 321 is located at the stitch separating position a2, the needle withdrawing spring 31 of the needle position switching device 30 drives the needle moving frame 132b of the needle connecting frame 132 to move upward along the longitudinal guide post 132a5 of the needle fixing frame 132a, so that the needle moving frame 132b approaches the upper fixing arm 132a1 of the needle fixing frame 132a, and the needle synchronizing protrusion 232 of the needle synchronizing mechanism 23 moves inside the needle synchronizing guide slot 231 of the needle synchronizing mechanism 23, wherein during the needle moving frame 132b approaches the upper fixing arm 132a1 by the action of the needle withdrawing spring 31, since the anti-falling stopper 333d2 of the anti-falling stopper 333d is located inside the moving frame region R1, the side contact plate 137 of the longitudinal moving seat 132b2 contacts the anti-falling stopper 333d4 of the anti-falling stopper 333d2 to push the anti-falling stopper 333d2, when the height position of the side contact plate 137 is higher than the height position of the anti-separation stopper 333D2, as shown in fig. 15F, the anti-separation stopper spring 333D3 pushes the anti-separation stopper 333D2, so that the anti-separation stopper 333D2 moves from the anti-separation position D1 to an anti-separation return position D2 directly below the side contact plate 137.

Referring to fig. 15G and 15H, the needle movable frame 132b of the needle connecting frame 132 continues to move upward by the needle withdrawing spring 31 of the needle position switching device 30, because the needle withdrawing block 342 of the needle withdrawing positioning mechanism 34 is located inside the movable frame region R1, so that the upper contact plate 136 of the longitudinal movable seat 132b2 contacts the needle withdrawing block 342, so that the upper contact plate 136 pushes the needle withdrawing block 342 to move to a needle withdrawing releasing position C2 located outside the movable frame region R1, when the height position of the upper contact plate 136 is higher than the height position of the needle withdrawing block 342, the positioning spring 343 of the needle withdrawing positioning mechanism 34 pushes the needle withdrawing block 342, so that the needle withdrawing block 342 moves from the needle withdrawing releasing position C2 to the needle withdrawing holding position C1, so that the needle withdrawing block 342 returns to the inside of the movable frame region R1, so that the needle withdrawing block 342 is located right below the upper contact plate 136, in this embodiment, when the upper contact plate 136 is located above the needle withdrawing block 342, the needle moving frame 132B of the needle connecting frame 132 has been moved upward by the needle withdrawing spring 31 of the needle position switching device 30, so that the upper contact plate 136 contacts the needle withdrawing stopper 342 to limit the movement of the needle moving frame 132B, and the movable needle 135 of the needle bar device 13 can be continuously positioned at a needle withdrawing position B2 away from the sewing position B1 by the needle withdrawing positioning mechanism 34, resulting in that the height position of the movable needle 135 can be higher than that of the fixed needle 134, whereby the needle position switching device 30 can move the needle moving frame 132B along the longitudinal axis L2, so that the height position of the movable needle 135 can be higher than that of the fixed needle 134.

In the preferred embodiment, when the movable needle 135 is located at the needle withdrawing position B2, the anti-release stopper 333d2 of the anti-release unit 333d is separated from the side contact plate 137 of the longitudinal movable seat 132B2 (as shown in fig. 15F), and then the release driving source 331a of the needle inserting release mechanism 33 drives the release telescopic rod 331B of the needle inserting release driving component 331 to extend inward, the release guiding plate 332B of the release moving component 332 moves to the outside of the stitching release region R2 of the needle inserting positioning component 321, and at the same time, the anti-release stopper 333d2 of the anti-release component 333 moves to the outside of the movable frame region R1, so that only the fixed needle 134 of the needle bar device 13 passes through the fixed inner presser foot 144 of the inner presser device when the shaft 121 of the needle bar driving device 12 drives the needle bar 131 of the needle bar device 13 to move up and down.

Referring to fig. 16A and 16B, when the needle withdrawing spring 31 of the needle position switching device 30 fails to move the upper contact plate 136 of the vertical movable seat 132B2 above the needle withdrawing stopper 342 due to a malfunction, the needle movable frame 132B of the needle connecting frame 132 is pulled by the needle withdrawing spring 31 to clamp the upper contact plate 136 below the guiding inclined plane of the needle withdrawing stopper 342, in this state, the needle withdrawing prevention stopper 333d2 of the needle withdrawing prevention unit 333d is separated from the side contact plate 137, and the needle withdrawing prevention stopper 333d2 is located below the side contact plate 137, so that the upper contact plate 136 can move above the needle withdrawing stopper 342, the needle driving source of the needle bar driving device 12 drives the upper shaft 121 of the needle bar driving device 12 to rotate continuously to move the needle bar 131 of the needle bar device 13 downward, and at this time, because the side contact plate 137 contacts the needle withdrawing prevention stopper 333d2, the needle movable frame 132B of the needle link 132 cannot move downward synchronously with the needle bar 131, and only the needle holder 132a of the needle link 132 can move downward by the needle bar 131 moving downward, and when the needle holder 132a moves downward, the upper fixed arm 132a1 of the needle holder 132a gradually approaches the needle movable frame 132B, so that the needle withdrawing stopper 342 moves to the needle withdrawing release position C2 by being pushed by the upper contact plate 136, and when the upper contact plate 136 is located above the needle withdrawing stopper 342, the positioning spring 343 of the needle withdrawing positioning mechanism 34 pushes the needle withdrawing stopper 342 to move the needle withdrawing stopper 342 from the needle withdrawing release position C2 to the needle withdrawing holding position C1, whereby the needle withdrawing positioning mechanism 34 can continuously position the movable needle 135 of the needle bar device 13 at the needle withdrawing position B2.

Referring to fig. 17A, when the double needle sewing machine is about to restore the movable needle 135 to the same height position as the fixed needle 134, the needle bar driving source of the needle bar driving device 12 drives the upper shaft 121 of the needle bar driving device 12 to rotate, so that the rotating upper shaft 121 drives the needle bar 131 of the needle bar device 13 to move downward via the crank shaft link 122 of the needle bar driving device 12, and the height position of the side contact plate 137 is lower than the return pushing part 352c of the return moving assembly 352.

As shown in fig. 17B, after the side contact plate 137 of the needle connecting frame 132 is located below the returning pushing component 352C, the returning driving source 351a of the needle withdrawing releasing mechanism 35 drives the returning telescopic rod 351B of the returning driving component 351 to extend outward, so that the returning pushing component 352B of the returning moving component 352 moves toward the returning transmission column 345 of the needle withdrawing positioning mechanism 34, and meanwhile, the returning pushing component 352C of the returning moving component 352 moves to the inside of the movable frame region R1, so that the returning pushing component 352C is located right above the side contact plate 137, wherein the returning pushing component 352B drives the needle withdrawing 342 of the needle withdrawing positioning mechanism 34 to the needle withdrawing releasing position C2 via the returning transmission column 345 and the releasing transmission component 344, so that the needle withdrawing block 342 is separated from the upper contact plate 136 of the needle moving frame 132B.

Referring to fig. 17C and 17D, after the needle withdrawing stop 342 of the needle withdrawing positioning mechanism 34 moves to the needle withdrawing releasing position C2 through the needle withdrawing releasing mechanism 35, the needle bar driving source of the needle bar driving device 12 drives the upper shaft 121 of the needle bar driving device 12 to rotate continuously, so that the rotating upper shaft 121 drives the needle bar 131 of the needle bar device 13 to move upward through the crank shaft link 122 of the needle bar driving device 12, and the needle connecting frame 132 of the needle bar device 13 and the needle inserting releasing mechanism 33 of the needle position switching device 30 move upward synchronously with the needle bar 131, wherein when the needle connecting frame 132 moves upward, the side contact plate 137 of the vertical movable seat 132b2 contacts the needle withdrawing stop 342 of the needle withdrawing positioning mechanism 34, so that the needle movable frame 132b of the needle connecting frame 132 cannot move synchronously with the needle bar 131, and only the needle fixed frame 132a of the needle connecting frame 132 can move upward through the moving needle bar 131, when the needle holder 132a moves upward, the lower fixed arm 132a2 of the needle holder 132a gradually approaches the needle movable frame 132b, and then the needle holder 132a and the needle movable frame 132b both extend the overall length of the needle withdrawing spring 31, wherein, in the process that the lower fixed arm 132a2 approaches the needle movable frame 132b, the needle entering spring 322 of the needle entering positioning mechanism 32 drives the needle entering positioning piece 321 of the needle entering positioning mechanism 32 to approach the needle movable frame 132b, so that the positioning abutting portion 321b of the needle entering positioning piece 321 is continuously contacted with the needle movable frame 132b, and when the needle rod 131 drives the entire needle entering positioning piece 321 to the uppermost position of the needle movable frame 132b, the positioning abutting portion 321b is no longer blocked by the edge of the needle movable frame 132b, so that the needle entering spring 322 of the needle entering positioning mechanism 32 drives the needle entering positioning piece 321 of the needle entering positioning mechanism 32 to rotate clockwise, in this embodiment, when the movable needle 135 is located at the sewing position B1, the tape unit release driving source of the needle withdrawing releasing mechanism 35 drives the return telescopic rod 351B of the tape unit release driving assembly to extend inward short, and the return contact member 352B and the return pushing member 352c move to the outside of the movable frame region R1, so that the needle 121 of the needle bar driving device 12 drives the needle bar 131 of the needle bar device 13 to move up and down, the fixed needle 134 and the movable needle 135 are simultaneously threaded through the fixed inner presser foot 144 and the movable inner presser foot 145, respectively.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (10)

1. A two-needle sewing machine with a variable needle pitch, comprising:

the needle bar fixing device comprises a headstock, a fixing device and a fixing device, wherein the headstock is provided with an upper shaft and a needle bar, and the upper shaft can rotate to drive the needle bar to move up and down;

a needle connecting frame which can synchronously move up and down with the needle bar and is provided with a needle fixing frame connected with the needle bar and a needle movable frame movably arranged on the needle fixing frame, wherein the needle fixing frame is provided with a fixed needle, and the needle movable frame is provided with a movable needle which is transversely arranged on the fixed needle at intervals;

a needle position switching device which can drive the needle movable frame to move relative to the needle fixed frame, so that the movable needle can be switched between a sewing position aligned with the fixed needle height and a needle withdrawing position higher than the fixed needle height; and

and the needle distance adjusting device can drive the needle movable frame to transversely move relative to the needle fixing frame, so that the horizontal spacing distance between the fixed needle and the movable needle can be changed in size.

2. A variable gauge needle count two-needle sewing machine according to claim 1, wherein the needle carriage has a laterally movable seat connected between the movable needle and the longitudinally movable seat, and a longitudinally movable seat which is movable laterally relative to the longitudinally movable seat by the gauge adjusting means, the longitudinally movable seat being movably connected to the needle carriage such that the longitudinally movable seat moves the laterally movable seat longitudinally by the needle position switching means.

3. The two-needle sewing machine with a variable needle pitch according to claim 1, wherein the needle position switching device comprises:

the needle inserting positioning mechanism is provided with a needle inserting positioning piece pivoted to the needle fixing frame and a needle inserting spring connected to the needle inserting positioning piece and the needle fixing frame at the same time, and the needle inserting spring is used for keeping the needle inserting positioning piece at a sewing keeping position so that the needle inserting positioning piece can be abutted against the needle moving frame;

the two ends of the needle withdrawing spring are respectively connected with the needle fixing frame and the needle moving frame, and the needle withdrawing spring is used for enabling the needle moving frame to be in contact with the needle inserting positioning piece, so that the needle moving frame cannot move relative to the needle fixing frame, and the movable needle is kept at the sewing position;

the needle inserting release mechanism can push the needle inserting positioning piece to enable the needle inserting positioning piece to move from the sewing maintaining position to a sewing separating position which is not contacted with the needle moving frame, and the moving needle moves to the needle withdrawing position through the needle withdrawing spring; and

the needle withdrawing releasing mechanism is provided with a returning pushing-against piece which can move relative to the needle connecting frame, the needle movable frame can be blocked by the returning pushing-against piece and cannot move along with the needle fixing frame, so that when the needle connecting frame moves upwards through the needle bar, the needle fixing frame can move relative to the needle movable frame, and meanwhile, the needle entering positioning piece returns the sewing separating position to the sewing keeping position through the needle entering spring.

4. The sewing machine with two needles having a variable needle pitch according to claim 3, wherein the needle position switching device further comprises a needle withdrawing positioning mechanism connected to the needle holder, the needle withdrawing positioning mechanism comprises a needle withdrawing stopper capable of moving relative to the needle holder and a positioning spring capable of pushing the needle withdrawing stopper, the positioning spring is used for keeping the needle withdrawing stopper at a needle withdrawing holding position abutting against the needle movable frame, so that the needle movable frame cannot move relative to the needle holder, and the movable needle is continuously positioned at the needle withdrawing position.

5. The two-needle sewing machine with a variable needle pitch according to claim 4, wherein the needle-withdrawing releasing mechanism further comprises a returning contact member capable of moving synchronously with the returning abutting member and a returning driving member connected to the head, the returning contact member is positioned at the needle-withdrawing stopper, and the returning driving member drives the returning abutting member and the returning contact member to move simultaneously, so that the returning contact member can drive the needle-withdrawing stopper to move to a needle-withdrawing releasing position separated from the needle moving frame, and the returning abutting member is in contact with the needle moving frame to restrict the needle moving frame from moving.

6. The two-needle sewing machine with a variable needle pitch according to claim 4, wherein the needle-in releasing mechanism has a needle-in releasing driving unit connected to the head, a movable releasing unit, and a needle-off preventing unit connected to the releasing unit, and the needle-in releasing driving unit can simultaneously drive the releasing unit and the needle-off preventing unit to move, so that the needle-off preventing unit contacts the needle movable frame to ensure that the movable needle is positioned at the needle-off position.

7. A variable gauge needle count two-needle sewing machine according to claim 1, wherein the gauge adjustment device has a gauge drive mechanism connected to the headstock, a gauge change mechanism connected to the gauge drive mechanism, and a needle synchronization mechanism located between the gauge change mechanism and the lateral movable seat, the gauge change mechanism being driven by the gauge drive mechanism to move the needle carriage along a lateral axis perpendicular to the needle bar via the needle synchronization mechanism, the needle synchronization mechanism being configured to allow the upper needle carriage to move longitudinally relative to the gauge change mechanism.

8. The two-needle sewing machine with a variable needle pitch according to claim 7, wherein the needle pitch changing mechanism has a needle pitch adjusting lever inserted through the needle bar, a needle pitch changing unit capable of converting a rotational motion into a linear motion, and a needle pitch adjusting plate disposed between the needle pitch changing unit and the needle synchronizing mechanism, the needle pitch adjusting plate being movable relative to the needle holder, and the needle pitch adjusting lever being rotatable by the needle pitch driving mechanism so that the rotating adjusting lever drives the needle pitch adjusting plate to move by the needle pitch changing unit.

9. The two-needle sewing machine with a variable needle pitch according to claim 8, the headstock is also provided with an inner presser foot bar which can move up and down through the upper shaft and an inner presser foot connecting frame which can synchronously move up and down with the inner presser foot bar, the inner presser foot connecting frame is provided with an inner presser foot fixing frame connected with the inner presser foot bar and an inner presser foot movable frame movably connected with the inner presser foot fixing frame, the inner presser foot movable frame is connected with an inner presser foot adjusting device assembled on the needle pitch adjusting rod, and when the spacing distance between the fixed needle and the movable needle is increased or decreased by the needle pitch adjusting device, the inner presser foot adjusting device drives the inner presser foot movable frame to move through the needle pitch adjusting rod, the movable inner presser foot assembled on the inner presser foot movable frame can be close to or far away from a fixed inner presser foot assembled on the inner presser foot fixing frame.

10. The two-needle sewing machine with the variable needle pitch needle count according to claim 1, wherein the head has a hook link pivotally connected to the head and a hook lever connected to the hook link, the hook link is connected to the needle pitch adjusting device through a hook adjusting device, and the hook lever is aligned with the movable needle, and when a spacing distance between the fixed needle and the movable needle becomes larger or smaller through the needle pitch adjusting device, the hook adjusting device drives the hook link to rotate through the needle pitch adjusting device, so that the hook lever is continuously aligned with the movable needle.

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