CN113073428B - Cloth feeding adjusting mechanism of sewing machine - Google Patents

Abstract

The invention relates to a cloth feeding adjusting mechanism of a sewing machine, which comprises a cloth feeding assembly, a connecting rod and a cloth feeding shaft crank, wherein the cloth feeding assembly comprises an upper cloth feeding tooth, an upper cloth feeding shaft driving the upper cloth feeding tooth to move, a main shaft and an adjusting assembly, the cloth feeding assembly also comprises the connecting rod and the cloth feeding shaft crank connecting the upper end of the upper cloth feeding shaft and the upper end of the connecting rod, the lower end of the connecting rod is sleeved on the main shaft through the adjusting assembly, the rotating center of the lower end of the connecting rod is eccentrically arranged with the main shaft, and the adjusting assembly can adjust the relative position between the rotating center of the lower end of the connecting rod and the axis of the main shaft. The cloth feeding adjusting mechanism has the advantages of simple structure, simplified cloth feeding assembly, convenient installation, good operability and convenient adjustment of cloth feeding amount.

Description

Cloth feeding adjusting mechanism of sewing machine

Technical Field

The invention relates to the field of sewing machines, in particular to a cloth feeding adjusting mechanism of a sewing machine.

Background

In a sewing machine, an upper feed dog in the prior art forms a feed path similar to an ellipse by the combined action of the swing in the front-back direction and the feed lifting dog in the up-down direction. During sewing, the upper cloth feeding amount of the sewing machine needs to be adjusted according to different sewed objects and sewing conditions, and the existing cloth feeding dog adjusting mechanism has the defects of complex structure, poor installation operability and the like.

Disclosure of Invention

In view of the above-mentioned disadvantages of the prior art, the present invention is to provide a cloth feeding adjustment mechanism of a sewing machine, which has a simple structure and is easy to install and operate,

in order to achieve the purpose, the invention provides a cloth feeding adjusting mechanism of a sewing machine, which comprises a cloth feeding assembly and an adjusting assembly, wherein the cloth feeding assembly comprises an upper cloth feeding tooth, an upper cloth feeding shaft for driving the upper cloth feeding tooth to move, a main shaft and the cloth feeding assembly, the cloth feeding assembly also comprises a connecting rod and a cloth feeding shaft crank for connecting the upper cloth feeding shaft and the upper end of the connecting rod, the lower end of the connecting rod is sleeved on the main shaft through the adjusting assembly, the rotating center of the lower end of the connecting rod is eccentrically arranged with the main shaft, and the adjusting assembly can adjust the relative position between the rotating center of the lower end of the connecting rod and the axis of the main shaft.

Furthermore, the adjusting component comprises a positioning slide block fixed on the main shaft, an adjusting slide block seat sleeved on the main shaft, a sliding sleeve, an open needle eccentric cam and a locking mechanism arranged between the open needle eccentric cam and the main shaft; the needle opening eccentric cam comprises an eccentric shaft sleeve which is rotatably sleeved on the main shaft, the sliding sleeve is rotatably sleeved on the eccentric shaft sleeve, two parallel first sliding planes are symmetrically arranged on the outer wall of the sliding sleeve, a connecting shaft sleeve is arranged at one end of the adjusting slide block seat, a positioning radial sliding groove matched with the positioning slide block is arranged on the other end face of the adjusting slide block seat, the adjusting slide block seat is sleeved on the sliding sleeve through an inner sliding groove inner hole, two second sliding planes which are respectively abutted and matched with the two first sliding planes are arranged in the sliding groove inner hole, a sliding adjusting gap capable of enabling the sliding sleeve to slide along the first sliding plane in the sliding groove inner hole is formed between the sliding groove inner hole and the sliding sleeve, the lower end of the connecting rod is rotatably sleeved on the connecting shaft sleeve, and the positioning radial sliding groove is relatively slidably clamped on the positioning slide block; the locking mechanism locks or unlocks the open needle eccentric cam and the main shaft in the circumferential direction.

Furthermore, the symmetrical center planes of the two second sliding planes in the inner hole of the sliding chute and the axis of the outer peripheral surface of the connecting shaft sleeve are eccentrically arranged.

Furthermore, the locking mechanism comprises a locking chute arranged on one end face of the needle opening eccentric cam, a locking sliding block clamped in the locking chute and a ratchet wheel fixed on the main shaft, wherein a pawl matched with the ratchet wheel is arranged on the locking sliding block, and the locking sliding block can slide in the locking chute to enable the pawl to be meshed with or separated from the ratchet wheel.

Furthermore, the ratchet wheel is provided with a limiting stop post, the end face of the opening needle eccentric cam provided with the locking sliding groove is also provided with two limiting pins, and the limiting stop post can abut against the limiting pins when the ratchet wheel and the opening needle eccentric cam rotate relatively.

Furthermore, the locking mechanism also comprises an elastic reset structure arranged between the needle opening eccentric cam and the locking slide block.

Furthermore, the elastic reset structure comprises a reset torsion spring fixedly installed on the needle opening eccentric cam, and one end of the reset torsion spring is connected to the locking sliding block.

Furthermore, the locking device further comprises an adjusting button assembly, the adjusting button assembly comprises a movable adjusting rod, a clamping notch is formed in the edge of the locking sliding groove, and the adjusting rod can move to be inserted into the clamping notch and push the locking sliding block to move.

Furthermore, the adjusting button assembly further comprises an adjusting sleeve fixedly mounted, a blocking surface arranged on the adjusting rod and a spring sleeved on the adjusting rod, and the spring is located between the blocking surface and the adjusting sleeve.

Furthermore, the cloth feeding assembly comprises a cloth feeding shaft mounting sleeve fixedly mounted and limit stops fixedly arranged on the upper cloth feeding shaft, the upper cloth feeding shaft is rotatably arranged in the cloth feeding shaft mounting sleeve in a penetrating mode, and the limit stops are located at two ends of the cloth feeding shaft mounting sleeve.

As described above, the cloth feeding adjustment mechanism of the sewing machine according to the present invention has the following advantageous effects:

the connecting rod and the cloth feeding shaft crank are arranged in the cloth feeding assembly, and the adjusting assembly is arranged between the connecting rod and the main shaft, so that the main shaft rotates to drive the connecting rod to move during normal sewing; when the cloth feeding amount of the upper cloth feeding tooth needs to be changed, the relative position between the rotating center of the lower end of the connecting rod and the main shaft is adjusted through the adjusting assembly. The cloth feeding adjusting mechanism can be applied to various sewing machines, particularly an overlock sewing machine, has a simple structure, simplifies a cloth feeding assembly, particularly a transmission structure between a main shaft and an upper cloth feeding shaft, and is convenient to install, good in operability and adjust the cloth feeding amount compared with the existing cloth feeding adjusting mechanism.

Drawings

Fig. 1 is a schematic structural view of a cloth feeding adjustment mechanism of the present invention.

Fig. 2 is a schematic structural view of the cloth feeding adjustment mechanism of the present invention at another viewing angle. .

Fig. 3 is an exploded view of the assembly of the adjustment assembly of the present invention.

Fig. 4 is a schematic structural view of the cloth feeding assembly of the present invention.

Fig. 5 is a schematic structural view of an adjusting slider seat in the present invention.

FIG. 6 is a schematic view of another view of the adjusting slider seat of the present invention

Fig. 7 is a front view of fig. 5.

Fig. 8 is a schematic structural view of the sliding sleeve of the present invention.

Fig. 9 is a front view of fig. 8.

FIG. 10 is a schematic view of the assembly of the adjusting block seat and the sliding sleeve in the present invention

Fig. 11 is a schematic structural view of the needle opening eccentric cam in the invention.

Fig. 12 is a structural schematic diagram of the needle opening eccentric cam in another view angle.

Fig. 13 is a front view of fig. 12.

FIG. 14 is a schematic diagram showing the relationship between the movement axes of the components before the cloth feeding adjustment mechanism of the present invention is adjusted.

FIG. 15 is a schematic view showing the relationship between the movement axes of the parts after adjustment by the cloth feeding adjustment mechanism of the present invention.

Fig. 16 is a curve diagram of the feed amount of the upper feed dog before and after the adjustment of the feed adjustment mechanism.

Description of the element reference numerals

1. Upper cloth feeding tooth

2. Upper cloth feeding shaft

3. Cloth feeding shaft crank

4. Main shaft

5. Connecting rod

51. Connecting rod cap

6. Positioning slide block

7. Adjusting slide block seat

71. Inner hole of sliding chute

711. Second sliding plane

712. Sliding adjusting clearance

72. Connecting shaft sleeve

73. Positioning radial sliding chute

74. Positioning plate

8. Sliding sleeve

81. First sliding plane

9. Needle opening eccentric cam

91. Eccentric shaft sleeve

92. Eccentric inner hole

93. Locking chute

94. Sliding disk

95. Clamping gap

10. Locking slide block

101. Pawl

11. Ratchet wheel

12. Reset torsion spring

13. Spacing bumping post

14. Limit pin

15. Adjusting rod

16. Adjusting sleeve

17. Spring

18. Gasket ring

19 O-shaped ring

20. Clamp spring

21. Crank of cloth feeding frame

22. Upper cloth feeding rack

23. Connecting rod sleeve

24. Oil seal

25. Left mounting sleeve of cloth feeding shaft

26. Right mounting sleeve of cloth feeding shaft

27. Limit stop block

28. Screw nail

29. Gasket

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure of the present invention.

It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be regarded as the scope of the present invention without substantial changes in the technical contents.

Referring to fig. 1 to 15, the invention provides a cloth feeding adjusting mechanism of a sewing machine, which comprises a cloth feeding assembly, wherein the cloth feeding assembly comprises an upper cloth feeding tooth 1, an upper cloth feeding shaft 2 driving the upper cloth feeding tooth 1 to move, a main shaft 4 and an adjusting assembly, the cloth feeding assembly further comprises a connecting rod 5 and a cloth feeding shaft crank 3 connecting the upper end of the upper cloth feeding shaft 2 and the upper end of the connecting rod 5, the lower end of the connecting rod 5 is sleeved on the main shaft 4 through the adjusting assembly, the rotating center of the lower end of the connecting rod 5 is eccentrically arranged with the main shaft 4, and the adjusting assembly can adjust the relative position between the rotating center of the lower end of the connecting rod 5 and the axis of the main shaft 4. When the sewing is normal, the main shaft rotates to drive the connecting rod to move, and the connecting rod drives the upper cloth feeding shaft to swing through the cloth feeding shaft crank because the rotating center of the lower end of the connecting rod 5 is eccentrically arranged with the main shaft 4, so that the swing of the upper cloth feeding teeth is realized; when the cloth feeding amount of the upper cloth feeding teeth needs to be changed, the relative position between the rotating center of the lower end of the connecting rod 5 and the main shaft 4 is adjusted through the adjusting assembly. In this embodiment, referring to fig. 1, the feed shaft crank 3 is fixed to the upper feed shaft 2 by a screw 28, and the upper end of the connecting rod 55 is fitted over the pin of the feed shaft crank 3 and is hinged to the feed shaft crank 3.

The cloth feeding adjusting mechanism can be applied to various sewing machines, particularly a bag sewing machine, has simple structure, simplifies the cloth feeding assembly, particularly simplifies the transmission structure between the main shaft 4 and the upper cloth feeding shaft 2, and has convenient installation, good operability and convenient adjustment of the cloth feeding amount compared with the prior cloth feeding adjusting mechanism.

In the present embodiment, referring to fig. 1 to 15, the adjusting assembly comprises a positioning slide 6 fixed on the main shaft 4, an adjusting slide seat 7 sleeved on the main shaft 4, a sliding sleeve 8 and an opening eccentric cam 9, and a locking mechanism arranged between the opening eccentric cam 9 and the main shaft 4.

The needle opening eccentric cam 9 includes an eccentric shaft sleeve 91 rotatably sleeved on the main shaft 4, and referring to fig. 11 to 13, an axis of an eccentric inner hole 92 in the eccentric shaft sleeve 91 and slidably sleeved and matched with the main shaft 4 is O3, an axis of an outer peripheral surface of the eccentric shaft sleeve 91 is O2, and an eccentricity between the two is d2. When the eccentric sleeve 91 is sleeved on the main shaft 4, the axis of the eccentric inner hole 92 is O3 and is concentric with the axis O0 of the main shaft 4, and referring to fig. 14, the eccentric sleeve 91 can only rotate on the main shaft 4 but cannot move radially.

The sliding sleeve 8 is rotatably sleeved on the eccentric shaft sleeve 91, two parallel first sliding planes 81 are symmetrically arranged on the outer wall of the sliding sleeve 8, referring to fig. 8 and 9, the symmetric center planes B of the two first sliding planes 81 are overlapped with the axis O4 of the inner hole of the sliding sleeve 8. When the sliding sleeve 8 is sleeved on the eccentric shaft sleeve 91, the axis O4 of the inner hole of the sliding sleeve 8 is concentric with the axis O2 of the outer peripheral surface of the eccentric shaft sleeve 91, as shown in fig. 14.

One end of the adjusting slider seat 7 is provided with a connecting shaft sleeve 72, the other end face is provided with a positioning radial sliding groove 73 adaptive to the positioning slider 6, the adjusting slider seat 7 is sleeved on the sliding sleeve 8 through an inner sliding groove inner hole 71, two second sliding planes 711 respectively abutted to the two first sliding planes 81 are arranged in the sliding groove inner hole 71, and preferably, the symmetrical center planes of the two second sliding planes 711 and the outer peripheral surface axis of the connecting shaft sleeve 72 are eccentrically arranged, a sliding adjusting gap 712 allowing the sliding sleeve 8 to slide along the first sliding plane 81 in the sliding groove inner hole 71 is arranged between the sliding groove inner hole 71 and the sliding sleeve 8, the lower end of the connecting rod 5 is rotatably sleeved on the connecting shaft sleeve 72, and the positioning radial sliding groove 73 is clamped on the positioning slider 6 in a relatively sliding manner. Specifically, referring to fig. 5 to 7, the eccentric distance between the axis O1 of the outer peripheral surface of the connecting sleeve 72, the center of symmetry plane a of the two second sliding planes 711, and the axis O1 is d1, and the center of symmetry plane of the two second sliding planes 711 and the axis of the outer peripheral surface of the connecting sleeve 72 may not be eccentrically disposed, and d1 is regarded as 0. When the connecting sleeve 72 is sleeved on the sliding sleeve 8, referring to fig. 10, the center of symmetry plane a and the center of symmetry plane B overlap, and due to the existence of the sliding adjusting gap 712, the sliding sleeve 8 can move radially along the first sliding plane 81 in the sliding groove inner hole 71 under the sliding fit action of the first sliding plane 81 and the second sliding plane 711. When the lower end of the link 5 is engaged with the coupling boss 72, specifically, the link cap 51 at the lower end of the link 55 is mounted on the coupling boss 72 of the adjustment slider holder 7 by the screw 28, and the rotation axis O5 of the lower end of the link 5 is concentric with O1, see fig. 14. Because the radial spout 73 in location and the adaptation of location slider 6, and the radial spout 73 in location joint on the location slider 6 relatively slidable ground for can be along the radial spout 73 relative radial movement in location between location slider 6 and the adjusting block seat 7, and, when location slider 6 rotated along with main shaft 4, can promote adjusting block seat 7 synchronous revolution.

The locking mechanism locks or unlocks the needle opening eccentric cam 9 and the main shaft 4 in the circumferential direction, when the locking mechanism locks, the needle opening eccentric cam 9 and the main shaft 4 are fixed in the circumferential direction to rotate synchronously, and when the locking mechanism unlocks in the circumferential direction, the needle opening eccentric cam can rotate on the main shaft 4 relatively.

In the cloth feeding adjustment mechanism of the present embodiment, when the cloth feeding adjustment mechanism is used, after the cloth feeding adjustment mechanism is assembled, referring to fig. 14 and 15, the partial assembly dimensional relationship among the connecting rod 5, the main shaft 4, the adjusting slider seat 7, the sliding sleeve 8, and the needle opening eccentric cam 9, a distance is provided between the rotation axis O5 of the lower end of the connecting rod 5 connected to the adjusting assembly and the axis O0 of the main shaft 4, and both are eccentrically disposed. During normal sewing, the needle opening eccentric cam 9 and the main shaft 4 are kept locked in the axial direction, when the main shaft 4 rotates, the positioning sliding block 6 and the needle opening eccentric cam 9 rotate synchronously, the positioning sliding block 6 pushes the adjusting sliding block seat 7 to rotate synchronously, the adjusting sliding block seat 7 drives the sliding sleeve 8 to rotate synchronously through the first sliding plane 81 and the second sliding plane 711, the positions of the adjusting sliding block seat 7 and the needle opening eccentric cam 9 do not change, and because the rotating axis center O5 at the lower end of the connecting rod 5 and the axis O0 of the main shaft 4 are arranged eccentrically, when the main shaft 4 rotates, the upper cloth feeding shaft 2 is driven to swing through the connecting rod 5 and the cloth feeding shaft transmission structure, so that the swing of the upper cloth feeding tooth 1 is realized. When the cloth feeding amount of the upper cloth feeding tooth 1 needs to be changed, namely when the swing amplitude of the upper cloth feeding tooth 1 is changed, circumferential locking between the needle opening eccentric cam 9 and the main shaft 4 is released, the needle opening eccentric cam 9 is stabilized and does not rotate, the sliding sleeve 8 can freely rotate on the eccentric shaft sleeve 91 of the needle opening eccentric cam 9, the main shaft 4 is properly rotated, the positioning sliding block 6 rotates along with the main shaft 4 and exerts thrust on the adjusting sliding block seat 7 through the positioning radial sliding groove 73, under the action of the thrust, the adjusting sliding block seat 7 and the sliding sleeve 8 rotate together, meanwhile, the adjusting sliding block seat 7 can also relatively slide relative to the positioning sliding block 6 and the sliding sleeve 8 due to eccentric arrangement, the adjusting sliding block seat 7 can smoothly rotate for a certain angle, and the needle opening eccentric cam 9 does not rotate, so that the relative angle position of the adjusting sliding block seat 7 and the needle opening eccentric cam 9 is changed, namely the relative angle position of the connecting shaft sleeve 72 and the eccentric shaft sleeve 91 is changed, and after adjustment is completed, the locking mechanism axially locks the needle opening eccentric cam 9 and the main shaft 4. Referring to the processes of fig. 14 to fig. 15, when the positional relationship shown in fig. 14 and fig. 15 is before and after adjustment, respectively, and the angular positional relationship between the two is changed from θ 1 to θ 2, at this time, the position between the inner hole axis O3 of the eccentric shaft sleeve 91 and the outer peripheral surface axis O1 of the connecting shaft sleeve 72 changes, that is, the position of the rotation axis O5 at the lower end of the connecting rod 5 and the axis O0 of the main shaft 4 changes, so that when the main shaft 4 rotates, the swing amplitude of the upper cloth feeding shaft 2 can be changed by transmitting motion through the connecting rod 5 and the cloth feeding shaft transmission structure, and the swing amplitude of the upper cloth feeding dog 1 is further changed, thereby changing the cloth feeding amount, referring to fig. 16, the curve in fig. 16 is a cloth feeding amount curve diagram under the angles θ 1 and θ 2 shown in fig. 14 and fig. 15.

The adjusting assembly in the embodiment can effectively change the relative position between the rotating center at the lower end of the connecting rod 5 and the main shaft 4, so that the swinging amplitude of the upper cloth feeding tooth 1 is effectively changed, the cloth feeding amount is changed, and the adjusting assembly is convenient to adjust, convenient to install, strong in operability and low in cost; meanwhile, after different cloth feeding amounts are adjusted, the initial cloth feeding time of the upper cloth feeding tooth 1 can be guaranteed to be unchanged, the coordination consistency with other mechanisms is guaranteed, and the sewing quality can be further improved.

In the present embodiment, referring to fig. 2 and 3, the locking mechanism includes a locking chute 93 disposed on one end surface of the needle opening eccentric cam 9, a locking slider 10 snap-fitted in the locking chute 93, and a ratchet 11 fixed on the main shaft 4, the locking slider 10 is provided with a pawl 101 cooperating with the ratchet 11, and the locking slider 10 can slide in the locking chute 93 to engage or disengage the pawl 101 with or from the ratchet 11. Specifically, in the present embodiment, the locking chute 93 is radially arranged, and when the pawl 101 is engaged with the ratchet 11, due to the fixed connection between the ratchet 11 and the main shaft 4 and the clamping and matching action between the locking chute 93 and the locking slider 10, the open needle eccentric cam 9 is circumferentially locked with the main shaft 4 to perform synchronous rotation; the locking slide block 10 is pushed to slide along the locking slide groove 93 in the radial direction until the pawl 101 is separated from the ratchet wheel 11, and the locking of the needle opening eccentric cam 9 and the main shaft 4 in the circumferential direction is released. Furthermore, a limit stop column 13 is arranged on the ratchet wheel 11, two limit pins 14 are further arranged on the end face of the opening needle eccentric cam 9 provided with the locking sliding groove 93, the limit stop column 13 can abut against the limit pins 14 when the ratchet wheel 11 and the opening needle eccentric cam 9 rotate relatively, the limit stop column 13 can be a bolt for fixing the ratchet wheel 11 on the main shaft 4, the mutual rotation range of the ratchet wheel 11 and the opening needle eccentric cam 9 is limited through the position of the limit pins 14, and therefore the adjustment range of the relative angle position of the sliding block seat 7 and the opening needle eccentric cam 9 is limited and adjusted.

Further, in this embodiment, the locking mechanism further includes an elastic resetting structure disposed between the needle opening eccentric cam 9 and the locking slider 10, and when the locking slider 10 slides to a position where the pawl 101 is separated from the ratchet 11, the elastic resetting structure is in an energy storage state and provides an elastic force for driving the locking slider 10 to reset to an engaged state. In the embodiment, the elastic reset structure preferably comprises a reset torsion spring 12 fixedly installed on the needle opening eccentric cam 9, and one end of the reset torsion spring 12 is connected to the locking slider 10.

As a preferable design, in this embodiment, the cloth feeding adjustment mechanism further includes an adjustment button assembly, the adjustment button assembly includes a movably installed adjustment lever 15, a clamping gap 95 is formed at an edge of the locking chute 93, the adjustment lever 15 is movable to be inserted into the clamping gap 95 and pushes the locking slider 10 to move, the adjustment lever 15 is specifically movably installed in the sewing machine housing, when adjustment is needed, the adjustment lever 15 is pushed to be inserted into the clamping gap 95 at the edge of the locking chute 93, the locking slider 10 is ejected to the pawl 101 to be separated from the ratchet 11, and meanwhile, the adjustment lever 15 is clamped in the clamping gap 95 so that the open needle eccentric cam 9 cannot rotate, thereby facilitating subsequent adjustment work. By adopting the adjusting button assembly in the embodiment, the position of the adjusting button assembly can be arranged at the front part of the sewing machine shell, and the operation is convenient. Further, in this embodiment, referring to fig. 1, the adjustment button assembly further includes an adjustment sleeve 16 fixedly mounted, a blocking surface provided on the adjustment rod 15, and a spring 17 sleeved on the adjustment rod 15, where the spring 17 is located between the blocking surface and the adjustment sleeve 16, specifically, in this embodiment, the spring 17 is sleeved on the adjustment rod 15, two ends of the spring 17 are respectively provided with an O-ring 19 and a washer 18, a front end of the spring 17 abuts against the adjustment sleeve 16 through the O-ring 19 and the washer 18, and a rear end abuts against the blocking surface on the adjustment rod 15 through the O-ring 19 and the washer 18, so that when adjustment is required, the adjustment rod 15 is pushed into the adjustment sleeve 16 and inserted into the clamping gap 95, the spring 17 is compressed, after adjustment is completed, the adjustment rod 15 automatically resets under the action of the spring 17, an open groove inner clamp at the front end of the adjustment rod 15 is further provided with a clamp spring 20, and the clamp spring 20 is used for abutting against the adjustment sleeve 16 when retraction. The driving source of the adjustment lever 15 may be manually adjusted or may be a driving source such as an electromagnet.

In this embodiment, preferably, referring to fig. 11, the needle opening eccentric cam 9 includes a sliding disk 94 fixedly disposed at one end of the eccentric sleeve 91, and the locking sliding slot 93 is disposed at an end surface of the sliding disk 94, so that the locking sliding slot 93 has a larger space for facilitating installation and matching with the locking slider 10; in addition, referring to fig. 5 to 7, the adjusting slider seat 7 includes a positioning disc 74 connected with the connecting shaft sleeve 72, and a positioning radial sliding groove 73 is formed in an end surface of the positioning disc 74, so that the adjusting slider seat 7 and the positioning slider 6 are convenient to mount and cooperate, and the whole operation of the adjusting assembly is stable and reliable.

Referring to fig. 1 and 4, in the present embodiment, the cloth feeding assembly includes a cloth feeding shaft mounting sleeve fixedly installed, and a limit stop 27 fixedly installed on the upper cloth feeding shaft 2, the upper cloth feeding shaft 2 is rotatably inserted into the cloth feeding shaft mounting sleeve, and the limit stop 27 is located at two ends of the cloth feeding shaft mounting sleeve. In this embodiment, referring to fig. 1, two limit stops 27 are provided on the upper cloth feeding shaft 2 and fixed by screws 28, two cloth feeding shaft mounting sleeves are provided, including a left cloth feeding shaft mounting sleeve 25 and a right cloth feeding shaft mounting sleeve 26, which are coaxial and fixedly mounted on the sewing machine housing, the right cloth feeding shaft mounting sleeve 26 is located between the two limit stops 27, the left end of the upper cloth feeding shaft 2 is connected with a cloth feeding frame crank 21, the left cloth feeding shaft mounting sleeve 25 is located between the cloth feeding frame crank 21 and the limit stops 27 and is provided with an oil seal 24 at the left end thereof, so that the axial position of the upper cloth feeding shaft 2 can be limited by the limit stops 27. The upper feed dog 1 is fixed at one end of the upper feed rack 22 through a screw 28, a connecting rod sleeve 23 and a gasket 29 are arranged in a hole at the other end of the upper feed rack 22, and the screw 28 penetrates through the connecting rod sleeve 23 and the gasket 29 to rotatably connect the upper feed rack 22 and the feed rack crank 21.

Compared with the existing design, the cloth feeding adjusting mechanism has the advantages of simple structure, convenience in adjustment, convenience in installation, strong operability, low cost and stability and reliability in operation; meanwhile, after different cloth feeding amounts are adjusted, the initial cloth feeding time of the upper cloth feeding tooth 1 can be guaranteed to be unchanged, the coordination consistency with other mechanisms is guaranteed, and the sewing quality is improved.

Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (8)

1. The utility model provides a sewing machine's work feed guiding mechanism, includes the work feed subassembly, the work feed subassembly includes work feed dog (1), drives last work feed axle (2) and main shaft (4) of work feed dog (1) motion, its characterized in that: the cloth feeding mechanism comprises a cloth feeding shaft crank (3), a connecting rod (5) and a cloth feeding shaft crank (2), wherein the cloth feeding shaft crank (3) is connected with the upper end of the connecting rod (5), the lower end of the connecting rod (5) is connected to a main shaft (4) in a sleeved mode through an adjusting component, the rotating center of the lower end of the connecting rod (5) is eccentrically arranged with the main shaft (4), the adjusting component can adjust the relative position between the rotating center of the lower end of the connecting rod (5) and the axis of the main shaft (4), and comprises a positioning slide block (6) fixed on the main shaft (4), an adjusting slide block seat (7) sleeved on the main shaft (4), a sliding sleeve (8), an opening needle eccentric cam (9) and a locking mechanism arranged between the opening needle eccentric cam (9) and the main shaft (4); the needle opening eccentric cam (9) comprises an eccentric shaft sleeve (91) which is rotatably sleeved on the main shaft (4), the sliding sleeve (8) is rotatably sleeved on the eccentric shaft sleeve (91), two parallel first sliding planes (81) are symmetrically arranged on the outer wall of the sliding sleeve (8), one end of the adjusting slider seat (7) is provided with a connecting shaft sleeve (72), the other end face of the adjusting slider seat is provided with a positioning radial sliding chute (73) which is matched with the positioning sliding block (6), the adjusting slider seat (7) is sleeved on the sliding sleeve (8) through an inner sliding chute inner hole (71), two sliding adjusting gaps (712) which are respectively matched with the two first sliding planes (81) in an abutting mode are arranged in the sliding chute inner hole (71), the lower end of the connecting rod (5) is sleeved on the connecting shaft sleeve (72), and the positioning sliding chute (73) can be relatively and slidably clamped on the positioning sliding block (6); the locking mechanism locks or unlocks the needle opening eccentric cam (9) and the main shaft (4) in the circumferential direction, and the symmetrical center planes of two second sliding planes (711) in the sliding groove inner hole (71) and the axis of the outer peripheral surface of the connecting shaft sleeve (72) are eccentrically arranged.

2. The feed adjustment mechanism of claim 1, wherein: the locking mechanism comprises a locking sliding groove (93) arranged on one end face of the needle opening eccentric cam (9), a locking sliding block (10) clamped in the locking sliding groove (93), and a ratchet wheel (11) fixed on the main shaft (4), wherein a pawl (101) matched with the ratchet wheel (11) is arranged on the locking sliding block (10), and the locking sliding block (10) can slide in the locking sliding groove (93) to enable the pawl (101) to be meshed with or separated from the ratchet wheel (11).

3. The feed adjustment mechanism of claim 2, wherein: the needle opening cam (9) is provided with a locking sliding groove (93), the ratchet wheel (11) is provided with a limiting stop column (13), the end face of the needle opening cam (9) provided with the locking sliding groove (93) is further provided with two limiting pins (14), and the limiting stop column (13) can abut against the limiting pins (14) when the ratchet wheel (11) and the needle opening cam (9) rotate relatively.

4. The feed adjustment mechanism of claim 2, wherein: the locking mechanism also comprises an elastic reset structure arranged between the needle opening eccentric cam (9) and the locking slide block (10).

5. The feed adjustment mechanism of claim 4, wherein: the elastic reset structure comprises a reset torsion spring (12) fixedly installed on the needle opening eccentric cam (9), and one end of the reset torsion spring (12) is connected to the locking sliding block (10).

6. The feed adjustment mechanism of claim 4, wherein: the locking mechanism is characterized by further comprising an adjusting button assembly, the adjusting button assembly comprises a movable adjusting rod (15), a clamping gap (95) is formed in the edge of the locking sliding groove (93), and the adjusting rod (15) can move to be inserted into the clamping gap (95) and push the locking sliding block (10) to move.

7. The feed adjustment mechanism of claim 6, wherein: the adjusting button assembly further comprises an adjusting sleeve (16) fixedly mounted, a blocking surface arranged on the adjusting rod (15) and a spring (17) sleeved on the adjusting rod (15), and the spring (17) is located between the blocking surface and the adjusting sleeve (16).

8. The feed adjustment mechanism of claim 1, wherein: the cloth feeding assembly comprises a cloth feeding shaft installation sleeve fixedly installed and limit stoppers (27) fixedly arranged on the upper cloth feeding shaft (2), the upper cloth feeding shaft (2) rotatably penetrates through the cloth feeding shaft installation sleeve, and the limit stoppers (27) are located at two ends of the cloth feeding shaft installation sleeve.

Images