CN111074439A

CN111074439A - Sewing thread hooking and cutting device of sewing machine

Info

Publication number: CN111074439A
Application number: CN201811219089.5A
Authority: CN
Inventors: 顾飞龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-10-19
Filing date: 2018-10-19
Publication date: 2020-04-28

Abstract

The invention relates to a sewing thread hooking and cutting device of a sewing machine, which mainly comprises a double power set, a link mechanism and a hooking and cutting unit, wherein the double power set consists of a first power source and a second power source, the output shaft ends of the two power sources are correspondingly connected with the link mechanism, the hooking and cutting unit comprises a base plate, one end of the base plate is provided with a first hooking cutter and a second hooking cutter, the other end of the base plate is correspondingly pivoted with the link mechanism, and the base plate is provided with a movable groove for positioning in the sewing machine; therefore, the double power sets output multi-section control stroke, and can drive the first and second hook cutters to respectively hook the sewing upper thread and the bottom thread to carry out linking and cutting, so that the sewing thread link is not separated.

Description

Sewing thread hooking and cutting device of sewing machine

Technical Field

The present invention relates to a sewing thread hooking and cutting device of a sewing machine, and more particularly, to a thread hooking and cutting device capable of hooking an upper thread and a lower thread of a sewing thread to perform linking and cutting so that the linking of the sewing thread does not fall off.

Background

The sewing machine has an automatic thread cutting function, when a sewing needle performs sewing, the thread hooking ring device drives a thread winding to penetrate through a coil formed by sewing threads and tightly fasten the thread winding ring device below cloth, and when the sewing operation is finished, a cutting knife on the side edge of the thread hooking ring device can cut the thread winding and sewing threads so as to finish the sewing. However, when the seam line of the sewn fabric is tightly tied to the underside of the fabric by each sewing line, the seam line at the extreme end falls off and the end of the seam line is pulled, the seam line gradually separates from the knot of the seam line, and the seam line sewn on the fabric gradually loosens.

In order to solve the above-mentioned drawback of gradual loosening of the sewing thread on the cloth, there have been developed in the industry a method and a device for preventing seam from raveling, such as taiwan patent publication No. 534117 or taiwan patent publication No. I485299, the method and the device comprising: a cutter holder arranged on the retreating position side of the annular ejector; a hook which moves back and forth by using a knife carrier; a restricting member for restricting the advance and retreat of the hook; and a path changing means for changing a path of the reciprocating movement of the hook, and further comprising a control means for controlling the hook to advance and retreat and engage with the loop top thread of the loop top device when the sewing is finished, stopping the front end of the hook behind the loop top thread by a restriction member after the loop top thread is caught when the hook retreats, driving a sewing machine for a stitch amount to advance the loop top device again while changing the path of the reciprocating movement of the hook after the hook is stopped, causing the hook to advance and engage with the loop top thread of the loop top device while engaging with the loop top thread caught by the loop top device, and causing the engaging portion of each thread to be cut by the knife by the following reciprocating movement.

Or taiwan patent publication No. M354617 "a hooking and cutting device for preventing the chain of sewing machine from loosening" developed by the inventor, wherein a hook-and-loop device and a cutting knife for hooking and taking a thread around the sewing machine are provided at one side of the device below the needle falling position of the board where the sewing machine moves up and down, and a hooking and cutting device is provided at the other side of the device, the device is characterized in that: the hooking and cutting device drives the swinging piece by a power source to push the swinging piece to push the movable component to move, so that the hooking knife assembled on the movable component can hook and cut the thread winding of the thread hooking ring device passing through the sewing line of the sewing machine.

In addition, taiwan patent publication M383578 "a hooking and cutting device (a) for preventing chain stitch from loosening" is provided, which is characterized in that a thread hooking ring and a cutting knife for hooking and taking a thread around a sewing thread are provided at one side of the device below a needle falling position of a plate where needles move up and down, and a hooking and cutting device is provided at the other side of the device: the hooking and cutting device mainly drives the supporting rod by a power source so as to enable the supporting rod to apply force to pull the swing arm to move, and the hooking knife arranged on the swing arm can hook and cut the thread winding of the thread hooking ring device penetrating through the sewing line of the sewing machine.

In addition, taiwan patent publication No. M467681 discloses a hooking device for sewing chain stitch, which mainly comprises a swing arm, a machine plate, a linkage, a swing plate, and a hooking knife, wherein the swing arm, the machine plate, the linkage, the swing plate, and the hooking knife are disposed on a sewing machine, the swing arm has a pivot pivoted to the machine plate via a pivot, a force application end pivoted to the linkage, and an actuation end having a pivot hole, the swing plate is pivoted to the actuation end of the swing arm, a slotted guide hole is formed on the swing plate, a guide rod is inserted into the slotted guide hole, and the hooking knife is connected to the swing plate.

However, the above-mentioned patent technology generally adopts a single-stitch-linked locking thread, but the single-linked locking thread also causes another stitch to be loosened, so that improvement is needed.

Therefore, the inventor takes the abundant design development and actual manufacturing experience of the related industry for many years, researches and improves the prior structure, and provides the sewing thread hooking device of the sewing machine so as to achieve the purpose of better practical value.

Disclosure of Invention

The present invention is directed to a sewing thread hooking device of a sewing machine, and more particularly, to a thread hooking device capable of hooking an upper thread and a lower thread of a sewing thread to perform linking and cutting, so that the sewing thread link is not separated.

The invention relates to a sewing thread hooking and cutting device of a sewing machine, which mainly aims at and has the effects and is achieved by the following specific technical means:

the double-power unit consists of a first power source and a second power source, the output shaft ends of the two power sources are correspondingly connected with the connecting rod mechanism, the hooking and cutting unit comprises a base plate, one end of the base plate is provided with a first hooking cutter and a second hooking cutter, the other end of the base plate is correspondingly pivoted with the connecting rod mechanism, and the base plate is provided with a movable groove for being assembled and positioned in the sewing machine table; therefore, the double power sets output multi-section control stroke, and can drive the first and second hook cutters to respectively hook the upper thread and the bottom thread of the sewing machine for linking and cutting, so that the sewing thread link is not separated.

The thread hooking and cutting device of the sewing machine is characterized in that the output shafts of the first and second power sources of the double power sets are respectively penetrated and assembled on a pressing plate, an elastic piece is sleeved on the output shaft of the second power source and abuts against the pressing plate, and a driving part is arranged on the pressing plate.

The sewing thread hooking and cutting device of the sewing machine, wherein the link mechanism comprises a first link plate provided with a pivot part at the central part, the pivot part is used for positioning the pivot group on the machine table, and one end of the first link plate is correspondingly connected with the driving part of the double power sets; a first connecting rod located in the first direction, one end of which is correspondingly connected with the other end of the first linkage sheet; a second linkage plate, a pivot part is arranged at the central part of the second linkage plate, the pivot part is used for pivotally positioning on the machine table, and one end of the second linkage plate is correspondingly and pivotally connected with the other end of the first connecting rod; and one end of the second connecting rod is correspondingly connected with the other end of the second linkage sheet, and the other end of the second connecting rod is correspondingly connected with the substrate of the hooking and cutting unit.

The sewing thread hooking and cutting device of the sewing machine is characterized in that the first hooking cutter and the second hooking cutter of the hooking and cutting unit are arranged adjacently, and the movable groove positions the hooking and cutting unit in the machine table through assembling components.

Drawings

FIG. 1: the invention is a three-dimensional exploded view.

FIG. 2: the invention discloses an assembled three-dimensional schematic diagram.

FIG. 3: the double power set of the invention is not shown before operation.

FIG. 4: the invention is a schematic three-dimensional appearance diagram during a first dynamic motion stroke.

FIG. 5: the invention discloses a first dynamic motion stroke schematic diagram of a double-power set.

FIG. 6: the invention has a schematic three-dimensional appearance in the second dynamic motion stroke.

FIG. 7: the invention discloses a second dynamic motion stroke schematic diagram of a double-power set.

FIG. 8: the invention has a three-dimensional appearance schematic diagram during the third dynamic motion stroke.

FIG. 9: the invention discloses a third dynamic motion stroke schematic diagram of a double-power set.

FIG. 10: the invention discloses a schematic diagram of a two-hook cutter hooking section thread and a bottom thread during sewing.

[ notation ] to show

1 double power set

11 first power source

111 first limiting part

112 second position limiting part

12 second power source

13 pressing plate

131 carry part

132 first through hole

133 second perforation

14 elastic member

2-bar linkage

20 pivot part

21 first linkage piece

22 first link

23 second interlocking sheet

231 pivoting part

24 second connecting rod

3 collude and cut unit

31 base plate

311 movable groove

32 first hook cutter

33 second hook cutter

34 group of devices

4 fixing sheet

41 elongated slot

A1 work bench

A2 first needle

A3 second needle

A4 hook ring device

Detailed Description

In order to make the technical content, the purpose and the efficacy achieved by the present invention more complete and clear, the following detailed description is provided, and reference is made to the accompanying drawings, in which:

first, referring to fig. 1-2, there are shown three-dimensional exploded and assembled schematic views of a sewing thread hooking and cutting device of a sewing machine according to the present invention, which mainly include:

a double power set 1, installed on the machine platform and composed of a first and a

second power source

11, 12, the output shafts of the first and the

second power source

11, 12 are respectively penetrated and set in a first and a second through

hole

132, 133 arranged on a press plate 13, and a first and a second

position limiting component

111, 112 are respectively sleeved on the output shaft of the first power source 11 corresponding to the two ends of the first through hole 132, so that the power stroke of the first power source 11 is restricted by the first and the second

position limiting component

111, 112, an elastic component 14 is sleeved on the output shaft of the second power source 12 and is abutted against the press plate 13, and a driving part 131 is arranged on one side of the press plate 13;

a link mechanism 2, which is provided with a pivot portion 20 and is correspondingly positioned on the machine platform, and at one end of the link mechanism 2 opposite to the pivot portion 20, the link mechanism can be connected with the driving portion 131, and the link mechanism 2 can be driven to actuate by the driving portion 131;

a hooking and cutting unit 3, which comprises a substrate 31, a first hooking cutter 32 and a second hooking cutter 33 are arranged on the substrate 31, the first hooking cutter 32 and the second hooking cutter 33 are arranged adjacent to each other, one end of the substrate 31 is correspondingly combined with the other end of the connecting rod mechanism 2, a movable groove 311 is arranged at the other end of the substrate 31, and the movable groove 311 positions the hooking and cutting unit 3 in the machine table through a group assembly 34.

Referring to fig. 1-3, when actually assembling, the dual power set 1 is installed inside the machine, the dual power set 1 includes a first and a second power source 11, 12, the distance and time of the motion stroke of the first and the second power source 11, 12 are different, the output shafts of the first and the second power source 11, 12 are respectively inserted into a pressing plate 13, and a stroke X with a proper length is reserved at the end of the output shaft of the first power source 11 on the pressing plate 13, i.e. the upper side of the pressing plate 13 abuts against the first limiting member 111 and the lower side abuts against the stroke between the second limiting members 112, and the output shaft of the second power source 12 is sleeved with an elastic member 14, and the elastic member 14 abuts against the pressing plate 13, and the end of the output shaft is not reserved with a stroke and is locked by a screw member, so that the two power sources form different motion stroke distances, Time; then, a fixing plate 4 is disposed on the machine platform, the fixing plate 4 is disposed with a long slot 41, and the driving portion 131 of the pressing plate 13 is pivotally connected to the link mechanism 2 through the long slot 41.

The link mechanism 2 mainly has the function of connecting the dual power set 1 and the hooking and cutting unit 3 so as to transmit the motion stroke output by the dual power set 1 to the hooking and cutting unit 3, therefore, the arrangement of the link mechanism 2 can be changed according to different sewing machines and is not limited to a specific form; here, a preferred implementable linkage 2 is illustrated in accordance with the accompanying drawings, comprising:

a first link plate 21, which is provided with a pivot part 20 at the central part, wherein the pivot part 20 is used for the pivot group to be positioned on the machine platform, and one end of the first link plate 21 is correspondingly connected with the driving part 131 of the double power group 1;

a first link 22 located in the first direction, one end of which is correspondingly connected to the other end of the first link 21;

a second linkage plate 23, a pivot part 231 is provided at the central part, the pivot part 231 is for pivot positioning on the machine station to form a rotation pivot, one end of the second linkage plate 23 is correspondingly pivot connected with the other end of the first connecting rod 22;

a second connecting rod 24 located in the second direction, one end of which is correspondingly connected to the other end of the second linking sheet 23, and the other end of the second connecting rod 24 is correspondingly connected to the substrate 31 of the hooking unit 3.

The linkage mechanism 2 is used for correspondingly connecting the double power sets 1 and the hooking and cutting unit 3, so that the motion stroke output by the double power sets 1 can be transmitted to the hooking and cutting unit 3; then, the base plate 31 of the hooking and cutting unit 3 is assembled on the machine table by the movable groove 311 and the assembling member 34 through the movable groove 311, and the base plate 31 is located below the working table a1 when the sewing machine table is sewn, and the first and second hooking and cutting

blades

32, 33 are respectively locked on the base plate 31 of the hooking and cutting unit 3, and the first and second hooking and cutting

blades

32, 33 are arranged adjacently.

In practical operation, please refer to fig. 4-5, by starting the dual power set 1, the first and second power sources 11, 12 are actuated simultaneously to drive the first moving stroke of the retracting output shaft, and drive the pressing plate 13 to compress the elastic member 14 at the output shaft of the second power source 12, and compress the first limiting member 111 at the output shaft of the first power source 11, and the driving portion 131 on the pressing plate 13 moves downward in the elongated slot 41 to drive the first linking piece 21, and because the pivoting portion 20 of the first linking piece 21 is positioned on the machine, the first linking piece 21 is caused to move rotationally, and the first linking rod 22 is pulled to move in the first direction, and the second linking piece 23 is driven to move rotationally, and when the second linking piece 23 rotates, the second linking rod 24 is driven to move in the second direction, so that the substrate 31 of the cutting unit 3 moves forward by the limiting and guiding of the movable hook 311 and the set assembly 34, simultaneously, the first hooking cutter 32 and the second hooking cutter 33 are driven to move forwards, the first needle A2 and the second needle A3 are in a state of rising after the cloth material is sewn, a sewing surface line (indicated by a solid black line) is enabled to form a coil, a loop hooking device A4 which is indicated by a dotted line and is used for threading a bottom line is enabled to be inserted into the coil of the two-surface line, the first hooking cutter 32 driven by the substrate 31 is enabled to be suitable for being positioned behind the upper line of a loop formed by the second needle A3, and the second hooking cutter 33 is enabled to be abutted between the loop hooking device A4 and the bottom line.

Then, referring to fig. 6-7, the dual-power unit 1 executes a second moving stroke, that is, the second power source 12 is released to reset and extend the output shaft, and the pressing plate 13 is supported by the elastic member 14 to reset upwards, but the first power source 11 is still in a retracted state, so that the pressing plate 13 moves upwards and abuts against the first limiting member 111, that is, the resettable stroke of the pressing plate 13 is only the stroke X reserved at the end of the output shaft of the first power source 11, that is, the driving portion 131 of the pressing plate 13 moves slightly in the long slot 41 and links the link mechanism 2 to move [ and the connecting manner thereof is not repeated herein ]; when the link mechanism 2 drives the hooking and cutting unit 3, the substrate 31 is moved backward by the movable slot 311 by a suitable distance, and the moving distance allows the first hooking and cutting knife 32 to hook the upper thread loop of the second needle A3 correspondingly, and the second hooking and cutting knife 33 to hook the bottom thread on the hooking and cutting device a4 correspondingly, and the second moving stroke stays for a suitable time, so that the rising first and second needles a2 and A3 pass through the sewing fabric material downwards and then are linked with the two upper thread loops respectively.

Then, referring to fig. 8-10, the dual-power set 1 executes a third moving stroke, that is, the first power source 11 is released to reset and extend the output shaft, so that the output shafts of the two power sources are reset to reset, and the driving portion 131 of the pressing plate 13 is reset and moved in the elongated slot 41 and drives the link mechanism 2 to move [ and the connecting mode is the same as the above-mentioned method, which is not described again ]; when the link mechanism 2 drives the hooking and cutting unit 3 to return, the base plate 31 returns and moves backward through the movable slot 311, and at the same time, another hooking and cutting knife below the worktable a1 is not shown to hook and cut the upper thread loop of the second needle A3, and the second hooking and cutting knife 33 hooks and cuts the bottom thread on the hooking and cutting device a4, so as to form the effect that the upper thread and the bottom thread of the sewing machine are not separated.

However, the above embodiments or drawings do not limit the structure or usage of the product of the present invention, and any suitable changes or modifications by those skilled in the art should be considered as not departing from the scope of the present invention.

Claims

1. A sewing thread hooking and cutting device of a sewing machine mainly comprises:

a pair of power sets, which is installed on the machine table and is composed of a first power source and a second power source, the output shafts of the first power source and the second power source are respectively penetrated and assembled in a first through hole and a second through hole which are arranged on a press plate, the output shaft of the first power source is respectively sleeved with a first limiting part and a second limiting part corresponding to the two ends of the first through hole, the power stroke of the first power source is limited by the first limiting part and the second limiting part, an elastic part is sleeved on the output shaft of the second power source and is abutted against the press plate, and one side of the press plate is provided with a driving part;

the connecting rod mechanism is provided with a pivot part and is correspondingly positioned on the machine platform, one end of the connecting rod mechanism, which is opposite to the pivot part, can be connected with the driving part and can drive the connecting rod mechanism to actuate through the driving part;

the hooking and cutting unit comprises a base plate, a first hooking cutter and a second hooking cutter are assembled on the base plate, the first hooking cutter and the second hooking cutter are arranged adjacent to each other, one end of the base plate is correspondingly assembled with the other end of the connecting rod mechanism, a movable groove is formed in the base plate, and the base plate is positioned in the machine table through an assembling component.

2. The sewing machine thread hooking device of claim 1, wherein the link mechanism comprises:

a first linkage piece, a pivot part is arranged at the central part of the first linkage piece, the pivot part is used for positioning the pivot group on the machine table, and one end of the first linkage piece is correspondingly connected with the driving part of the double power groups;

the first connecting rod is positioned in the first direction, and one end of the first connecting rod is correspondingly connected with the other end of the first linkage sheet;

a second linkage plate, a pivot part is arranged at the central part of the second linkage plate, the pivot part is used for pivotally positioning on the machine table, and one end of the second linkage plate is correspondingly and pivotally connected with the other end of the first connecting rod;

and one end of the second connecting rod is correspondingly connected with the other end of the second linkage sheet, and the other end of the second connecting rod is correspondingly connected with the substrate of the hooking and cutting unit.

3. The sewing machine thread hooking device of claim 1 or 2, wherein a fixing plate is further provided on the machine table, the fixing plate having a long slot, and the driving portion of the pressing plate is pivotally coupled to the link mechanism through the long slot.