CN215251593U - Feeding mechanism of sewing machine and sewing machine - Google Patents

Abstract

The utility model relates to a sewing machine feeding mechanism and sewing machine. The sewing machine feeding mechanism includes: a frame; the main shaft is arranged on the frame in a rotatable manner around the axis of the main shaft; the cloth feeding shaft is rotatably arranged on the frame around the axis of the cloth feeding shaft and is connected to the main shaft in a driven manner; the cloth feeding tooth frame is connected to the cloth feeding shaft in a driven mode; the differential tooth rack is connected to the cloth feeding shaft in a driven manner; the cloth feeding mechanism comprises a first cloth feeding actuating part connected between the main shaft and the cloth feeding shaft and a second cloth feeding actuating part connected between the cloth feeding shaft and the cloth feeding tooth frame; a cloth feed adjusting mechanism connected to the first cloth feed actuating portion to adjust an amount of movement of the cloth feed dog in a cloth feed direction; the differential mechanism comprises a first differential actuating part connected between the main shaft and the cloth feeding shaft and a second differential actuating part connected between the cloth feeding shaft and the differential tooth frame; a differential adjustment mechanism connected to the first differential actuation portion to adjust an amount of movement of the differential gear rack in the differential direction. The scheme can improve the cloth feeding capacity of the sewing machine.

Description

Feeding mechanism of sewing machine and sewing machine

Technical Field

The utility model relates to a sewing machine technical field especially relates to sewing machine feeding mechanism and sewing machine.

Background

In the existing feeding mechanism of the sewing machine, when the eccentricity of the needle pitch adjusting component is adjusted, the included angle between the eccentricity and the main shaft cannot be changed. In addition, the differential motion and the cloth feeding are both transmitted through the differential motion adjusting frame. According to the cloth feeding track formed by the scheme of the existing sewing machine, the motion tracks of teeth are basically symmetrical relative to the centers of tooth sockets, when the needle pitch is small and the differential motion is small, a large gap exists between a differential tooth and the cloth feeding tooth, the feeding performance is reduced due to the large gap between the teeth in the feeding process, and particularly when a peduncle is passed, the peduncle is clamped in the gap between the teeth, so that the situation that the feeding cannot be carried out is caused. If the tooth gap is adjusted to be small in the existing sewing machine scheme, the tooth can touch the needle plate when the needle pitch is adjusted to be large. Obviously, the existing cloth feeding scheme has larger defects. In addition, the existing needle pitch adjusting scheme has to stop the machine firstly, then press the needle pitch adjusting button and rotate the hand wheel to the corresponding position, and the adjusting process is complex. In addition, the existing needle pitch regulator assembly has a complex part structure and higher precision requirement.

SUMMERY OF THE UTILITY MODEL

Therefore, the feeding mechanism of the sewing machine and the sewing machine can improve the cloth feeding capacity.

A sewing machine feed mechanism comprising: a frame; the main shaft is rotatably arranged on the rack around the axis of the main shaft; the cloth feeding shaft is rotatably arranged on the frame around the axis of the cloth feeding shaft and is connected to the main shaft in a driven manner; a feed dog carrier drivenly connected to the feed shaft; a differential dental articulator drivenly connected to the feed shaft; a cloth feed mechanism comprising a first cloth feed actuating portion connected between the spindle and the cloth feed shaft and a second cloth feed actuating portion connected between the cloth feed shaft and the feed dog; a cloth feed adjustment mechanism connected to the first cloth feed actuation portion for adjusting an amount of movement of the cloth feed dog in a cloth feed direction; a differential mechanism comprising a first differential actuation section connected between the spindle and the feed shaft and a second differential actuation section connected between the feed shaft and the differential dental articulator; a differential adjustment mechanism connected to the first differential actuation portion for adjusting an amount of movement of the differential dental articulator in the differential direction.

According to the feeding mechanism of the sewing machine provided by the embodiment, the main shaft drives the cloth feeding tooth rack and the differential tooth rack to move in the cloth feeding direction respectively through the cloth feeding shaft, the adjustment of the movement amount of the cloth feeding tooth rack in the cloth feeding direction is realized by the cloth feeding adjusting mechanism, and the adjustment of the movement amount of the differential tooth rack in the cloth feeding direction is realized by the differential adjusting mechanism 8. By means of the scheme of the embodiment, the adjusting process is simple and easy to implement, and the machine does not need to be stopped.

In one embodiment, the first cloth feed actuating portion includes: the cloth feeding eccentric wheel is sleeved on the main shaft; one end of the cloth feeding transmission rod is hinged to the cloth feeding eccentric wheel; one end of the first cloth feeding connecting rod is hinged to the other end of the cloth feeding transmission rod, and the other end of the first cloth feeding connecting rod is hinged to the cloth feeding shaft.

In one embodiment, the second cloth feed actuating portion includes: one end of the second cloth feeding connecting rod is hinged to the cloth feeding shaft, and the other end of the second cloth feeding connecting rod is hinged to the cloth feeding tooth frame.

In one embodiment, the cloth feed adjusting mechanism includes: a cloth feeding adjusting handle; the cloth feeding adjusting crank is rotatably arranged on the rack around the axis of the cloth feeding adjusting crank, and one end of the cloth feeding adjusting crank is connected to the cloth feeding adjusting handle; one end of the cloth feeding adjusting connecting rod is hinged to the other end of the cloth feeding adjusting crank, and the other end of the cloth feeding adjusting connecting rod is hinged to the cloth feeding transmission rod.

In one embodiment, the distance between the rotation axis of the cloth feed adjusting crank and the hinge axis between the cloth feed adjusting crank and the cloth feed adjusting link is equal to the distance between the hinge axis between the cloth feed adjusting link and the cloth feed adjusting crank and the hinge axis between the cloth feed adjusting link and the cloth feed transmission rod, and in the cloth feed starting state, the rotation axis of the cloth feed adjusting crank and the hinge axis between the cloth feed adjusting link and the cloth feed transmission rod are in the same straight line.

According to the feeding mechanism of the sewing machine provided by the embodiment, the feed dog frame and the feed dog of the feed dog frame can be kept unchanged at the feed starting position regardless of the needle pitch.

In one embodiment, the first differential actuation portion comprises: the differential eccentric wheel is sleeved on the main shaft; one end of the differential transmission rod is hinged to the differential eccentric wheel; one end of the first differential connecting rod is hinged to the other end of the differential transmission rod, and the other end of the first differential connecting rod is hinged to the cloth feeding shaft.

In one embodiment, the second differential actuation portion comprises: one end of the second differential connecting rod is hinged to the cloth feeding shaft, and the other end of the second differential connecting rod is hinged to the differential tooth rack.

In one embodiment, the differential adjustment mechanism comprises: a differential adjustment handle; the differential adjusting crank is rotatably arranged on the rack around the axis of the differential adjusting crank, and one end of the differential adjusting crank is connected to the differential adjusting handle; one end of the differential adjusting connecting rod is hinged to the other end of the differential adjusting crank, and the other end of the differential adjusting connecting rod is hinged to the differential transmission rod.

In one embodiment, the distance between the rotation axis of the differential adjustment crank and the articulation axis between the differential adjustment crank and the differential adjustment link is equal to the distance between the articulation axis between the differential adjustment link and the differential adjustment crank and the articulation axis between the differential adjustment link and the differential transmission rod, and in the end-of-feed condition, the rotation axis of the differential adjustment crank is in line with the articulation axis between the differential adjustment link and the differential transmission rod.

According to the feeding mechanism of the sewing machine provided by the embodiment, the differential tooth rack and the differential tooth thereof can be kept unchanged at the position of cloth feeding ending regardless of the needle pitch.

A sewing machine comprises the sewing machine feeding mechanism.

Drawings

Fig. 1 is a schematic view of a cloth feeding apparatus of a sewing machine according to an embodiment of the present invention, in which a frame is omitted;

FIG. 2 is a schematic view of the other side of the cloth feeding device of the sewing machine of FIG. 1;

FIG. 3 is a schematic view of another side of the cloth feeding device of the sewing machine of FIG. 1

FIG. 4 is a schematic view of the stitch length adjustment principle of the feeding mechanism of the sewing machine according to the present invention;

FIG. 5 is a schematic view of a cloth feeding start position of the feeding mechanism of the sewing machine according to the present invention;

FIG. 6 is a schematic view of the differential adjustment principle of the feeding mechanism of the sewing machine according to the present invention;

fig. 7 is a schematic view showing a cloth feeding end position of the feeding mechanism of the sewing machine according to the present invention.

Description of the element reference numerals

1. A main shaft; 11. a tooth lifting slide block; 2. a cloth feeding shaft; 3. a cloth feeding mechanism; 31. a cloth feeding eccentric wheel; 32. a cloth feeding transmission rod; 321. a first furcation joint; 33. a first cloth feeding connecting rod; 34. a first cloth feeding crank; 35. a second cloth feeding crank; 36. a second cloth feeding connecting rod; 4. a feed dog frame; 41. a feed dog; 5. a cloth feed adjusting mechanism; 51. a cloth feeding adjusting handle; 52. a cloth feeding adjusting scale plate; 53. a cloth feeding adjusting crank; 531. a first handle bar; 532. a first crank shaft; 54. a cloth feeding adjusting connecting rod; 6. a differential mechanism; 61. a differential eccentric wheel; 62. a differential drive rod; 621. a second furcation joint; 63. a first differential link; 64. a differential crank; 65. a second differential link; 7. a differential dental articulator; 71. differential teeth; 8. a differential adjustment mechanism; 81. a differential adjustment handle; 82. a differential adjustment scale plate; 83. a differential adjustment crank; 831. a second handle bar; 832. a third crank shaft; 84. a differential adjusting link.

The present invention is described in further detail with reference to the drawings and the detailed description.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The utility model discloses a work feed orbit of sewing machine work feed device, wherein the work feed initial position of ensureing work feed tooth (also known as main work feed tooth) is close to the eedle as far as possible, and the work feed ending position of differential tooth is close to the eedle as far as possible for clearance between work feed tooth and the differential tooth is minimum, can furthest promote sewing machine work feed device's work feed ability.

Fig. 1 to 3 show a cloth feeding device of a sewing machine according to the present invention. The cloth feeding device of the sewing machine comprises a frame (not shown), a main shaft 1, a cloth feeding shaft 2, a cloth feeding mechanism 3, a cloth feeding tooth frame 4, a cloth feeding adjusting mechanism 5, a differential mechanism 6, a differential tooth frame 7 and a differential adjusting mechanism 8.

As shown in fig. 3, the main shaft 1 is provided on the frame to be rotatable about its axis, but not movable in the axial direction. The main shaft 1 is eccentrically sleeved with a rotatable tooth lifting slide block 11, so that the tooth lifting slide block 11 is eccentrically hinged with the main shaft 1. The feed dog slide block 11 supports the feed dog frame 4 and the differential dog frame 7, and realizes vertical feed dog movement along with the rotation of the main shaft 1. The cloth feeding shaft 2 is parallel to the main shaft 1 and arranged on the frame, and the cloth feeding shaft 2 can rotate around the axis of the cloth feeding shaft 2 but can not move in the axial direction. Therefore, a sleeve is fixedly arranged on the frame, two ends of the cloth feeding shaft 2 are respectively arranged in the sleeve in a penetrating mode, and each end is axially limited through a check ring.

The cloth feeding mechanism 3 is used for driving the cloth feeding shaft 2 to swing under the driving of the main shaft 1, and further driving the cloth feeding tooth frame 4 to move in the cloth feeding direction. As shown in fig. 1 to 3, in the cloth feeding mechanism 3, a cloth feeding eccentric 31 is fixedly fitted on the main shaft 1. One end of the cloth feeding transmission rod 32 is rotatably sleeved on the cloth feeding eccentric wheel 31 to realize the hinging of the cloth feeding transmission rod and the cloth feeding eccentric wheel, and the other end of the cloth feeding transmission rod 32 is hinged to the first cloth feeding connecting rod 33. In the illustrated embodiment, the feed drive rod 32 is formed with a collar at one end for hingedly fitting over the feed eccentric 31, and the feed drive rod 32 is formed with a first forked connector 321 at the other end, the first forked connector 321 having a shaft on which the first feed link 33 is rotatably fitted for articulation with the feed drive rod 32. The first feed link 33 is articulated to the feed shaft 2. In the embodiment shown, the feed shaft 2 is fixedly provided with a first feed crank 34, while the first feed link 33 is articulated to the first feed crank 34. Further, a second feed crank 35 is provided at a position of the feed shaft 2 spaced apart from the first feed crank 34 in the axial direction, the second feed crank 35 is hinged to one end of a second feed link 36, and the other end of the second feed link 36 is hinged to the feed dog carrier 4. In the embodiment shown, a bush is fixed to the feed dog 4, on which bush the second feed link 36 is rotatably fitted to effect articulation with the feed dog 4. Therefore, the rotation of the cloth feeding eccentric wheel 31 can be driven through the reciprocating rotation of the main shaft 1, so that the cloth feeding transmission rod 32 together with the first cloth feeding connecting rod 33 drives the first cloth feeding crank 34 to rotate, and then the cloth feeding shaft 2 drives the second cloth feeding crank 35 to drive the second cloth feeding connecting rod 36 to move, and the movement of the cloth feeding tooth rack 4 together with the cloth feeding teeth 41 arranged on the cloth feeding tooth rack in the cloth feeding direction is realized.

The amount of movement of the feed dog carrier 4 together with the feed dog 41 in the feed direction is realized by the feed adjusting mechanism 5. As shown in fig. 1 to 3, in the cloth feeding adjustment mechanism 5, a cloth feeding adjustment handle 51 is engaged with a cloth feeding adjustment dial 52 by a nut, for example, and the cloth feeding adjustment dial 52 is fixed to the frame. The cloth feeding adjustment crank 53 includes a first lever 531, and first and second crank shafts 532 and 532 vertically connected to opposite ends of the first lever 531. The first crank shaft 532 is rotatably provided on the frame about its axis, whereby the feed adjusting crank 53 as a whole can be rotated about the axis of the first crank shaft 532. The feed adjustment handle 51 is fixedly connected to a first crank shaft 532 of the feed adjustment crank 53. One end of the cloth feeding adjusting connecting rod 54 is rotatably sleeved on the second crank shaft of the cloth feeding adjusting crank 53 to realize the hinging of the cloth feeding adjusting connecting rod 54 and the cloth feeding adjusting crank 53. The other end of the feed adjustment link 54 is hinged to the feed drive link 32. In the illustrated embodiment, the other end of the feed adjustment link 54 is rotatably fitted over the shaft of the first diverging joint 321 of the feed transfer lever 32, so that the feed adjustment link 54 and the first feed link 33 are coaxially hinged to the feed transfer lever 32. By removing the nut of the cloth feed adjusting handle 51, the position of the cloth feed adjusting handle 51 can be adjusted according to the cloth feed adjusting scale plate 52, and then the position adjustment of the cloth feed adjusting crank 53 and the cloth feed adjusting connecting rod 54 is driven.

Fig. 4 shows the needle pitch adjustment principle of the feeding mechanism of the sewing machine according to the present invention. Before explaining the principle shown in fig. 4 in detail, the feeding mechanism of the sewing machine of the present invention is defined as follows, wherein the self rotation axis of the main shaft 1 (i.e., the central axis thereof) is the axis a; the rotation axis of the cloth feeding adjustment crank 53 (i.e., the central axis of the first crank shaft 532) is the axis F; the feed shaft 2 has its own axis of rotation (i.e. its central axis) as axis G; the central axis of the shaft on the first forked joint 321 of the feed drive link 32 (i.e. the hinge axis between the feed adjustment link 54 and the feed drive link 32) is the axis C; the hinge axis of the cloth feeding adjusting connecting rod 54 and the cloth feeding adjusting crank 53 is an axis D; the axis of articulation between the first feed crank 34 and the first feed link 33 on the feed shaft 2 is the axis E.

Projecting the above-mentioned axes in the axial direction with their correspondence, a projection similar to a link mechanism is obtained as shown in fig. 4, in which point a corresponds to the projection of axis a, link ab corresponds to the eccentricity of feed cam 31, point C corresponds to the projection of axis C, point D corresponds to the projection of axis D, point E corresponds to the projection of axis E, point F corresponds to the projection of axis F, and point G corresponds to the projection of axis G.

Referring to fig. 4, and referring to the embodiment shown in fig. 1 to 3, the larger the swing amount of the lever ge, the larger the needle pitch, the larger the movement amount of the feed dog 4 in the feed direction, and vice versa. By adjusting the feed adjustment handle 51, the position adjustment of the point d around the point F can be achieved. In the four-link mechanism abcd shown in fig. 4, the swing motion of the lever ab swings the lever cd. In the four-bar linkage cdeg, the swinging of the lever cd drives the lever eg to swing. By adjusting the position of the point d, the change of the swinging amount of the rod dc can be realized, the swinging amount of the point e can be further changed, and finally the change of the needle pitch can be realized. When the point c swings to the right limit position, the point e also swings to the right limit position, and the feed dog 41 also reaches the foremost end, that is, the feed start position. In this way, to ensure that the feed start positions of the feed dogs with different stitch lengths are unchanged, only the position of the right limit point of the rod ge in the stitch length adjustment process needs to be ensured to be unchanged, namely the right limit position of the rod dc is unchanged. In order to ensure that the position of the point c is not changed during the adjustment of the rod fd at the cloth feeding starting position (point c is at the right limit point), the length of the rod fd is firstly ensured to be equal to that of the rod dc, and the point c is coincident with the point f.

From the above reasoning, returning to the embodiment shown in fig. 1 to 3, the relationship can be obtained that the distance between the rotation axis F of the cloth feed adjusting crank 53 and the hinge axis D between the cloth feed adjusting crank 53 and the cloth feed adjusting link 54 is equal to the distance between the hinge axis D between the cloth feed adjusting link 54 and the cloth feed adjusting crank 53 and the hinge axis C between the cloth feed adjusting link 54 and the cloth feed transmission rod 32, and that the rotation axis F of the cloth feed adjusting crank 53 and the hinge axis C between the cloth feed adjusting link 54 and the cloth feed transmission rod 32 are in the same straight line in the cloth feed start state.

As fig. 5 is the cloth feeding initial position designed by the utility model, at this moment, the rod bc passes through the point a, the point c and the point e all swing to the right limit point, and the point c and the point f are coincident state. At this time, the stitch length is adjusted, that is, when the rod fd rotates around the point f, the point c does not change, and finally, the cloth feeding starting position of the cloth feeding tooth is not changed regardless of the size of the stitch length.

The differential mechanism 6 is used for driving the differential tooth rack 7 to move in the cloth feeding direction under the driving of the main shaft 1. As shown in fig. 1 and 2, in the differential mechanism 6, a differential eccentric 61 is fixedly fitted on the main shaft 1. One end of the differential transmission rod 62 is rotatably sleeved on the differential eccentric wheel 61 to realize the hinging of the two, and the other end of the differential transmission rod 62 is hinged to the first differential connecting rod 63. In the illustrated embodiment, one end of the differential transmission rod 62 is formed with a collar to be hingedly fitted over the differential eccentric 61, the other end of the differential transmission rod 62 is formed with a second forked joint 621, the second forked joint 621 is provided with a shaft, and the first differential link 63 is rotatably fitted over the shaft to achieve the hinge connection with the differential transmission rod 62. The first differential link 63 is articulated to the feed shaft 2. In the embodiment shown, the feed shaft 2 is fixedly fitted with a differential crank 64, the differential crank 64 having a shaft, and the first differential link 63 is rotatably fitted over the shaft to effect articulation to the differential crank 64. One end of the second differential link 65 is also sleeved on the shaft of the differential crank 64 to realize articulation, and the other end of the second differential link 65 is articulated to the differential dental articulator 7. In the embodiment shown, a bushing is fixed to the differential dental articulator 7, on which bushing the second differential link 65 is rotatably mounted to effect articulation with the differential dental articulator 7. Thereby, the rotation of the feed eccentric 31 and the differential eccentric 61 can be synchronously driven by the reciprocating rotation of the main shaft 1, and further, the feed dog 4 together with the feed dog 41 and the differential dog 7 together with the differential dog 71 are simultaneously driven to move in the feed direction respectively.

The amount of movement of the differential carrier 7 together with the differential teeth 71 in the cloth feeding direction is realized by the differential adjusting mechanism 8. As shown in fig. 1 and 2, in the differential adjustment mechanism 8, a differential adjustment handle 81 is engaged with a differential adjustment scale plate 82 by, for example, a nut, and the differential adjustment scale plate 82 is fixed to a chassis. The differential adjustment crank 83 includes a second handle bar 831, and third and fourth crank shafts 832 and 832 vertically coupled to opposite ends of the second handle bar 831. The third crank shaft 832 is rotatably provided on the frame about its own axis, whereby the differential adjusting crank 83 as a whole can rotate about the axis of the third crank shaft 832. The differential adjustment handle 81 is fixedly connected to a third crank shaft 832 of the differential adjustment crank 83. One end of the differential adjusting connecting rod 84 is rotatably sleeved on the fourth crank shaft of the differential adjusting crank 83 to realize the hinge joint of the differential adjusting connecting rod 84 and the differential adjusting crank 83. The other end of the differential adjusting link 84 is hinged to the differential transmission rod 62. In the illustrated embodiment, the other end of the differential adjusting link 84 is rotatably fitted over the shaft of the second forked joint 621 of the differential transmission lever 62, so that the differential adjusting link 84 and the first differential link 63 are coaxially hinged on the differential transmission lever 62. By removing the nut of the differential adjustment handle 81, the position of the differential adjustment handle 81 can be adjusted according to the differential adjustment scale plate 82, and the position adjustment of the differential adjustment crank 83 and the differential adjustment connecting rod 84 is driven.

Fig. 6 shows the differential adjustment principle of the feeding mechanism of the sewing machine according to the present invention. Before explaining the principle shown in fig. 6 in detail, the feeding mechanism of the sewing machine of the present invention is defined as follows, wherein the self rotation axis of the main shaft 1 (i.e., the central axis thereof) is the axis a; the axis of rotation of the differential adjustment crank 83 itself (i.e. the central axis of its third crank shaft 832) is the axis F'; the feed shaft 2 has its own axis of rotation (i.e. its central axis) as axis G; the central axis of the shaft on the second forked joint 621 of the differential transmission rod 62 (i.e., the hinge axis between the differential adjustment link 84 and the differential transmission rod 62) is the axis C'; the hinge axis of the differential adjusting connecting rod 84 and the differential adjusting crank 83 is an axis D'; the axis of articulation between the differential crank 64 on the feed shaft 2 and the first differential link 63 is the axis E'.

Projecting the above-described respective axes in the axial direction with their corresponding relationship therebetween, a projection view similar to the link mechanism shown in fig. 6 is obtained, in which point a corresponds to the projection of axis a, link ab corresponds to the eccentric amount of the differential eccentric 61, point C 'corresponds to the projection of axis C', point D 'corresponds to the projection of axis D', point E 'corresponds to the projection of axis E', point F 'corresponds to the projection of axis F', and point G corresponds to the projection of axis G.

Referring to fig. 6, and referring to the embodiment of fig. 1 to 3, the larger the swing amount of the lever ge', the larger the differential distance, the larger the movement amount of the differential rack 7 in the cloth feeding direction, and vice versa. By adjusting the differential adjustment handle 81, the position adjustment of the point d 'turning around the axis point f' can be realized. In the four-link mechanism abc'd' shown in fig. 6, the swing motion of the lever ab drives the lever c'd' to swing. In the four-bar linkage c'd' e 'g, the swinging of the lever c'd 'swings the lever e' g. By adjusting the position of the point d ', the variation of the swing amount of the rod d' c 'can be realized, and further the variation of the swing amount of the point e' can be realized, and finally the variation of the differential distance can be realized. When the point c 'swings to the right limit position, the point e' also swings to the right limit position, and the differential tooth 71 also reaches the extreme end, i.e., the cloth feeding end position. In this way, to ensure that the cloth feeding end position of the differential tooth is not changed at different differential distances, it is only required to ensure that the right limit position of the rod ge ' is not changed during the differential adjustment process, i.e., the right limit position of the rod d ' c ' is not changed. In order to ensure that the position of the c ' point is not moved in the adjusting process of the rod f'd ' when the cloth feeding end position (the c ' point is at the right limit point), firstly, the length of the rod f'd ' is ensured to be equal to that of the rod d ' c ', and the c ' point is overlapped with the f point.

From the above reasoning, returning to the embodiment shown in fig. 1 to 3, it is possible to obtain a relationship that the distance between the rotation axis F 'of the differential adjustment crank 83 and the articulation axis D' between the differential adjustment crank 83 and the differential adjustment link 84 is equal to the distance between the articulation axis D 'between the differential adjustment link 84 and the differential adjustment crank 83 and the articulation axis C' between said differential adjustment link 84 and the differential transmission rod 62, and that in the end-of-feed condition, the rotation axis F 'of the differential adjustment crank 83 coincides with the articulation axis C' between the differential adjustment link 84 and the differential transmission rod 62.

Fig. 7 shows the cloth feeding end position designed by the present invention, at this time, the rod ac ' passes through the point b, the point c ' and the point e ' both swing to the right limit point, and the point c ' and the point f ' are in a coincident state. At this time, when the differential distance is adjusted, that is, f'd' rotates around the point f ', the point c' does not change, and finally, the differential feed cloth end position is not changed regardless of the magnitude of the differential distance.

In one embodiment, axis C and axis C 'may be a line that coincides, axis F and axis F' may be a line that coincides, axis D and axis D 'may be a line that coincides, and axis E' may be a line that coincides.

The utility model also provides a sewing machine, including aforementioned sewing machine feeding mechanism.

According to the utility model discloses a sewing machine work feed device can realize following advantage:

1. the needle pitch and the differential distance can be conveniently adjusted without stopping the machine.

2. The clearance between the feed dog and the differential dog is reduced to the minimum, and the feed capacity can be improved.

3. The processing technology of part of the parts can be simplified.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A sewing machine feeding mechanism, characterized by comprising:

a frame;

the main shaft (1) is rotatably arranged on the frame around the axis of the main shaft (1);

a cloth feeding shaft (2), wherein the cloth feeding shaft (2) is rotatably arranged on the frame around the axis of the cloth feeding shaft and is connected to the main shaft (1) in a driven manner;

a feed dog (4), the feed dog (4) being drivenly connected to the feed shaft (2);

a differential dental articulator (7), the differential dental articulator (7) being drivenly connected to the feed shaft (2);

a cloth feeding mechanism (3), wherein the cloth feeding mechanism (3) comprises a first cloth feeding actuating part connected between the main shaft (1) and the cloth feeding shaft (2) and a second cloth feeding actuating part connected between the cloth feeding shaft (2) and the cloth feeding tooth frame (4);

a feed adjustment mechanism (5), said feed adjustment mechanism (5) being connected to said first feed actuation portion for adjusting the amount of movement of said feed dog carrier (4) in a feed direction;

a differential mechanism (6), said differential mechanism (6) comprising a first differential actuation portion connected between said main shaft (1) and said feed shaft (2) and a second differential actuation portion connected between said feed shaft (2) and said differential dental articulator (7);

a differential adjustment mechanism (8), said differential adjustment mechanism (8) being connected to said first differential actuation portion for adjusting an amount of movement of said differential dental articulator (7) in said differential direction.

2. The sewing machine feed mechanism of claim 1, wherein the first feed actuating portion comprises:

the cloth feeding eccentric wheel (31), the cloth feeding eccentric wheel (31) is sleeved on the main shaft (1);

a cloth feeding transmission rod (32), wherein one end of the cloth feeding transmission rod (32) is hinged to the cloth feeding eccentric wheel (31);

a first cloth feeding connecting rod (33), one end of the first cloth feeding connecting rod (33) is hinged to the other end of the cloth feeding transmission rod (32), and the other end of the first cloth feeding connecting rod (33) is hinged to the cloth feeding shaft (2).

3. The sewing machine feed mechanism of claim 2, wherein the second feed actuating portion comprises:

a second feed connecting rod (36), one end of the second feed connecting rod (36) is hinged to the feed shaft (2), and the other end of the second feed connecting rod (36) is hinged to the feed dog frame (4).

4. The sewing machine feed mechanism according to claim 2, wherein the feed adjustment mechanism (5) comprises:

a cloth feeding adjustment handle (51);

the cloth feeding adjusting crank (53) is rotatably arranged on the rack around the axis of the cloth feeding adjusting crank (53), and one end of the cloth feeding adjusting crank (53) is connected to the cloth feeding adjusting handle (51);

a cloth feeding adjusting connecting rod (54), one end of the cloth feeding adjusting connecting rod (54) is hinged to the other end of the cloth feeding adjusting crank (53), and the other end of the cloth feeding adjusting connecting rod (54) is hinged to the cloth feeding transmission rod (32).

5. The feeding mechanism of sewing machine according to claim 4, characterized in that the distance between the rotation axis (F) of the feed adjusting crank (53) and the hinge axis (D) between the feed adjusting crank (53) and the feed adjusting link (54) is equal to the distance between the hinge axis (D) between the feed adjusting link (54) and the feed adjusting crank (53) and the hinge axis (C) between the feed adjusting link (54) and the feed transmission rod (32), and in the feed start state, the rotation axis (F) of the feed adjusting crank (53) is in the same line with the hinge axis (C) between the feed adjusting link (54) and the feed transmission rod (32).

6. The sewing machine feed mechanism of any of claims 1-5, wherein the first differential actuation portion comprises:

the differential eccentric wheel (61), the said differential eccentric wheel (61) is fitted over the said basic shaft (1);

a differential transmission rod (62), one end of the differential transmission rod (62) is hinged to the differential eccentric wheel (61);

a first differential connecting rod (63), one end of the first differential connecting rod (63) is hinged to the other end of the differential transmission rod (62), and the other end of the first differential connecting rod (63) is hinged to the cloth feeding shaft (2).

7. The sewing machine feed mechanism of claim 6, wherein the second differential actuation portion comprises:

a second differential link (65), one end of the second differential link (65) being articulated to the feed shaft (2), the other end of the second differential link (65) being articulated to the differential dental articulator (7).

8. Sewing machine feed mechanism according to claim 6, characterized in that said differential adjustment mechanism (8) comprises:

a differential adjustment handle (81);

a differential adjusting crank (83), wherein the differential adjusting crank (83) is rotatably arranged on the frame around the axis of the differential adjusting crank, and one end of the differential adjusting crank (83) is connected to the differential adjusting handle (81);

a differential adjusting connecting rod (84), one end of the differential adjusting connecting rod (84) is hinged to the other end of the differential adjusting crank (83), and the other end of the differential adjusting connecting rod (84) is hinged to the differential transmission rod (62).

9. Sewing machine feeding mechanism according to claim 8, characterized in that the distance between the axis of rotation (F ') of the differential adjustment crank (83) and the axis of articulation (D') between the differential adjustment crank (83) and the differential adjustment link (84) is equal to the distance between the axis of articulation (D ') between the differential adjustment link (84) and the differential adjustment crank (83) and the axis of articulation (C') between the differential adjustment link (84) and the differential transmission rod (62), and in the end-of-feed condition the axis of rotation (F ') of the differential adjustment crank (83) is in line with the axis of articulation (C') between the differential adjustment link (84) and the differential transmission rod (62).

10. A sewing machine characterized by comprising a sewing machine feed mechanism according to any one of claims 1 to 9.

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