JP2002239276A - Feed device for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feed device for a sewing machine capable of restraining wear of members structuring a differential feed regulating mechanism. SOLUTION: The feed device for the sewing machine is movably supported on a supporting shaft (55) at one end thereof and is provided with a differential feed regulating link (51) connected with a connection point of connecting members for transmitting swinging motion of a main shaft to a differential feed shaft at the other end as the differential feed regulating mechanism (50) for regulating a longitudinal movement range of a differential feed tooth 4b. Changing a pivotal position changes a rotation trace of the differential feed regulating link (51) and the longitudinal movement range of the differential feed tooth (4b). Making the differential feed regulating mechanism a link structure eliminates use of members such as conventional sliders, a regulating arm or the like sliding on each other in a sewing operation, restraining the wear of the members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeder for a sewing machine having a main feed dog for actively feeding a workpiece and a differential feed dog for feeding a workpiece secondary.

[0002]

2. Description of the Related Art Conventionally, for example, a flat stitch sewing machine and a double chain stitch sewing machine have been known as sewing machines provided with a differential adjusting mechanism for performing sewing in accordance with the characteristics of the cloth. Hereinafter, the structure of the sewing machine having the differential adjustment mechanism will be described. This sewing machine is disclosed in, for example, JP-A-9-14096.
As disclosed in Japanese Patent Publication No. 6 (see FIGS. 5 to 7), the eccentric cam 105 mounted on the sewing machine main shaft M and the main feed shaft 101 are directly connected by the main feed link 111, and the sewing machine main shaft M A structure is provided in which the main feed shaft 101 swings around the axis in accordance with the rotation of. And the main feed shaft 101
The differential feed shaft 102 is connected to a main feed dog 104a and a differential feed dog 104b arranged before and after the needle drop position. Therefore, as will be described later, the main feed dog 104a and the differential feed dog 104b reciprocate in the front-rear direction as the main feed shaft 101 and the differential feed shaft 102 swing.

Next, a transmission mechanism for transmitting the swing of the main feed shaft 101 to the differential feed shaft 102 and the differential feed shaft 101
By changing only the swing angle of the differential feed dog 104b
A differential feed adjustment mechanism for changing the front-rear movement amount of the main feed dog relative to the front-rear movement amount of the main feed dog will be described. The transmission mechanism includes a differential arm 112 having a proximal end fitted to an end of the main feed shaft 101 and a differential feed arm 122 having a proximal end fitted to a corresponding position of the differential feed shaft 102. Feeding link 12
3 are connected.

[0004] The swing generated on the main feed shaft 101 is
The signal is transmitted to the differential feed shaft 102 via the adjustment arm 112, the differential feed link 123, and the differential feed arm 122. Then, the swing of the differential feed shaft 102 is controlled by the swing arm 140 and the link 141 fixed to the end of the differential feed shaft 102.
, The differential feed dog 104b supported by the differential feed plate 142 moves back and forth. Note that in FIG.
In order to clearly show a connecting portion between the differential feed arm 122 and the differential feed arm 122, the differential feed shaft 102 is not shown and the base end side of the differential feed arm 122 is cut away. For easy understanding, FIG. 5 shows only a part of the main feed shaft 101 and the differential feed shaft 102. Reference numeral 103 denotes a vertical feed shaft for vertically moving the main feed dog 104a and the differential feed dog 104b.

Next, the differential feed adjusting mechanism will be described. The differential feed adjusting mechanism includes an adjusting arm 112, a slider 114, a differential feed arm 122, a differential feed link 123.
Etc. The adjusting arm 112 is an arc-shaped arm having a predetermined curvature. On one surface of the adjusting arm 112, a concave groove is formed in a vertical direction along the curvature of the adjusting arm 112. The differential feed link 123 is provided between the slider 114 slidably held in the groove of the adjustment arm 112 and the distal end of the differential feed arm 122.

The swing angle of the differential feed shaft 102 is determined by changing the swing angle of the main feed shaft 101 by the arm length of the adjusting arm 112 (from the sliding position of the slider 114 on the adjusting arm 112 to the axis of the main feed shaft 101). It changes according to the ratio of the arm length of the differential feed arm 122 (the length from the axis of the differential feed shaft 102 to the connecting position of the differential feed link 123) to the length of the differential feed arm 122. In addition, while the arm length of the differential feed arm 122 is constant, the arm length of the adjustment arm 112 can be adjusted according to the sliding position of the slider 114 on the adjustment arm 112.

[0007] The method of adjusting the sliding position of the slider 114 is as follows.
First, the moving nut 181 moves up and down by rotating the differential adjusting knob 182 and rotating the differential adjusting screw 180. With this movement, the differential adjustment lever 108
b is pressed up and down, and the differential adjustment lever 10
8b swings with the pivot 108a. This swing is transmitted to the swing arm 108 fitted to the extended end of the pivot 108a into the sewing machine bed B1, and the swing arm 10
8 swings up and down according to the operation amount of the adjustment knob 182. When the swing arm 108 swings, the first connection link 19 pivotally supported by the rear end of the swing arm 108
1 is pulled up and down, and the slider 190 connected to the other end of the connection link 191 is guided by the linear guide 109 and slides. Then, this sliding is transmitted to the slider 114 via the second connecting link 192, and the slider 114 is slid along the adjusting arm 112 and is constrained to an appropriate position, thereby completing the operation. Thus, the slider 1
By adjusting the sliding position of 14, a differential adjustment of changing the feed amount of the differential feed dog 104b relative to the movement amount of the main feed dog 104a becomes possible.

According to the above-described transmission mechanism and differential feed adjusting mechanism, the swing angle of the differential feed shaft 102 is adjusted to thereby feed the differential feed dog 104b (the amount of movement in the front-rear direction). Can be changed arbitrarily with respect to the feed amount of the main feed dog 104a, and it is possible to obtain an appropriate feed amount of the cloth according to the type of the sewing cloth.

[0009]

However, when a differential feed adjusting mechanism having the above-described structure is used, a part of the slider 114 is always in contact with the adjusting arm 112, and therefore, the sewing is performed. The swing of the main feed shaft 101 and the differential feed shaft 102 during the operation causes a problem that the slider 114 and the adjusting arm 112 are worn. Also, the arm length of the adjusting arm 112 and the differential feed arm 12
When the arm lengths of the sliders 2 are slightly different, a force is applied in the vertical direction of the slider 114. This force causes the slider 114 to move up and down in a very small range while the main feed shaft 101 swings, and there is a problem that the slider 114 and the adjusting arm 112 are worn by this up and down movement.

SUMMARY OF THE INVENTION An object of the present invention is to provide a feeder for a sewing machine which can suppress the wear of members constituting a differential feed adjusting mechanism in consideration of the above-mentioned problems.

[0011]

According to a first aspect of the present invention, a differential feed dog (4b) and a main feed dog (4a) for feeding a workpiece are provided. A differential feed shaft (2) and a main feed shaft (1) that oscillate around each axis for moving back and forth, and a plurality of connecting members (first differential feed arm 31) , The second differential feed arm 32, the first differential feed link 33, the second differential feed link 34) to the differential feed shaft (the transmission mechanism 30 to the differential feed shaft). ), A main feed adjusting mechanism (20) for simultaneously changing the swing angles of the differential feed shaft and the main feed shaft, and adjusting the amount of forward and backward movement of the differential feed dog and the main feed dog. The differential feed adjustment mechanism that changes only the swing angle of the differential feed dog and changes the amount of longitudinal movement of the differential feed dog relative to the amount of longitudinal movement of the main feed dog ( 0), the differential feed adjusting mechanism is movably supported at one end by a support shaft (55), and constitutes the transmission mechanism at the other end. A differential feed adjustment link (5) rotatably connected to a connection point between the connection members.
Wherein the movement trajectory of each connecting member is determined by the rotation of the differential feed adjustment link about the support shaft, and the support shaft is moved to tilt the differential feed adjustment link with respect to the horizontal plane. The movement trajectory of each connecting member is adjusted by changing the angle.

According to the feeder of the sewing machine of the first aspect, the differential feed adjusting mechanism includes a differential feed adjusting link.
That is, since the differential feed adjusting mechanism is constituted by a link mechanism, it is not necessary to use members that slide with each other during sewing work, such as a slider and an adjusting arm, which are conventionally used. It is possible to suppress abrasion of members constituting the adjustment mechanism.

According to a second aspect of the present invention, there is provided a feeder for a sewing machine according to the first aspect, wherein a connecting member of the transmission mechanism is connected to a first differential feed arm (3) joined to a main feed shaft.
1), a first differential feed link (33) rotatably connected to the first differential feed arm, and a second differential feed rotatably connected to the first differential feed link. A link (34) and a second differential feed arm (32) rotatably connected to the second differential feed link and joined to the differential feed shaft, wherein the differential feed adjusting link is provided. , At the connection point between the first differential feed link and the second differential feed link.

According to the second aspect of the present invention, the same effect as in the first aspect can be obtained, and the transmission mechanism and the differential feed adjusting mechanism constitute a four-bar linkage.
The structure of the feed device of the sewing machine can be simplified.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a sewing machine feeding apparatus according to an embodiment of the present invention.

As shown in FIGS. 1 to 4, a sewing machine bed B1 is provided.
A sewing machine main shaft S that rotates around the shaft center by transmission from a sewing machine motor (not shown) is installed inside (see FIG. 1), and the main feed shaft 1 and the differential feed shaft 2 are substantially parallel to the machine main shaft S. And a vertical feed shaft 3 is installed. Then, the main feed shaft 1 and the differential feed shaft 2 can swing around the axis of each shaft via a transmission mechanism described later. The vertical feed shaft 3 also oscillates about the axis, but the description is omitted because it is a known technique.

Further, a substantially rectangular cylinder-shaped cylinder bed B2 (cylinder bed portion) is provided which protrudes leftward in a front view of the sewing machine bed B1 (sewing machine main body). And the sewing machine main shaft S, main feed shaft 1, differential feed shaft 2
And the vertical feed shaft 3 is extended to the inside of the cylinder bed B2, and the feed dog mechanism 4 is disposed immediately below the needle drop position.
It is connected to. The working feed dog 4b and the main feed dog 4a are arranged in the cylinder bed B2. Further, a main feed adjusting mechanism 20 and a differential feed adjusting mechanism 50, which will be described later, are arranged in the sewing machine bed main body B1.

The feed dog mechanism 4 is a mechanism that causes the differential feed dog 4b and the main feed dog 4a arranged before and after the needle drop position to perform a feed operation (forward and backward movement and up and down movement). Since the feed dog mechanism 4 is a known technique, it will be briefly described below. The main feeder 40 supporting the main feed dog 4a and the differential feeder 41 supporting the differential feed dog 4b are slidably combined in the front-rear direction. Square pieces 42 and 43 are fitted on both sides. The square pieces 42 and 43 are pivotally supported at the ends of the vertical feed shaft 3 and the sewing machine main shaft S via respective eccentric rings. Further, the swing arm 44 fixed to the tip of the main feed shaft 1 and the main feed base 40 are connected via a connection link 45, and the swing arm 44 fixed to the tip of the differential feed shaft 2 is similarly connected. A structure is provided in which the moving arm 46 and the differential feed base 41 are connected via a connecting link 47.

By the feed dog mechanism 4 as described above, the main feed dog 4a and the differential feed dog 4b are moved forward and backward respectively according to the swing of the main feed shaft 1 and the differential feed shaft 2, and the vertical feed shaft. (3) to perform intermittent feed corresponding to the vertical movement of the needle to the sewing cloth (sewn material) supplied to the needle drop position by performing an elliptical movement combined with the vertical movement according to the swing of (3). Can be.

Next, the transmission mechanism 10 from the sewing machine main shaft S to the main feed shaft 1 (hereinafter referred to as "the transmission mechanism 10 to the main feed shaft") will be described. Transmission mechanism 10 to main feed shaft
Is a front end of a main feed rod 12 connected to a main feed eccentric cam 11 mounted on a sewing machine main shaft S, and a front end of a main feed arm 13 having a base end fitted to a predetermined position of the main feed shaft 1. , And a structure directly connected via the main feed link 14. One end of the main feed rod 12 has a front support U.
The main feed link 14 and a main feed adjusting link 21 to be described later are rotatably supported by the U-shaped portion while being held therebetween.

Since the transmission mechanism 10 for the main feed shaft having such a structure is a known technique, it will be briefly described below. First, when the main shaft S of the sewing machine rotates, the main feed rod 12 connected to the main feed eccentric cam 11 reciprocates with a stroke corresponding to the amount of eccentricity of the main feed eccentric cam 11. Then, the leading end portion of the main feed arm 13 is pushed and pulled in the front-rear direction via the main feed link 14, and the main feed arm 13
The main feed shaft 1 fitted on the shaft swings about the axis. Then, this swing is transmitted to the main feed base 40 via the swing arm 44 and the connecting link 45, and the main feed dog 4a supported by the main feed base 40 moves forward and backward.

Next, by changing the swing angles of the main feed shaft 1 and the differential feed shaft 2 at one time, the amount of movement of the main feed dog 4a and the differential feed dog 4b in the front-rear direction is changed at once. The main feed adjusting mechanism 20 for performing the operation will be described. The main feed adjusting mechanism 20 includes a main feed adjusting link 21 and a main feed adjusting table 2.
2. It is roughly composed of a main feed adjusting screw 23 and the like. As described above, one end of the main feed adjustment link 21 is rotatably supported by the connecting portion between the main feed rod 12 and the main feed link 14, and the other end is supported by the support shaft 24. And is rotatably connected to the main feed adjusting table 22 via the.

The main feed adjusting base 22 is provided at one end thereof with the main feed adjusting link 2 via the support shaft 24 as described above.
1 and is pivotally supported at the other end so as to be rotatable around a pivot 25. The pivot 25 is joined to the cylinder bed B2 at one end. Further, as shown in FIG.
2a is provided, and the protruding portion 22a is in contact with the tip of a main feed adjusting screw 23 screwed into the front wall of the sewing machine bed B1. Further, the main feed adjusting table 22 is urged forward by a spring 23a stretched between the main feed adjusting table 22 and the front wall of the sewing machine bed B1. 2 and 3, the projection 22a, the main feed adjusting screw 23, and the spring 23a are not shown.

When the operation of the main feed adjusting screw 23 is performed in a direction in which the length of the main feed adjusting screw 23 protruding into the sewing machine bed B1 is increased, the main feed adjusting table 22 exerts the urging force of the spring 23a. The main feed adjustment table 22 rotates in accordance with the biasing force of the spring 23a when the rotation is performed in the direction of reducing the length of the protrusion into the sewing machine bed B1. Therefore, by operating the main feed adjusting screw 23, the position of the spindle 24 connecting the main feed adjusting table 22 and the main feed adjusting link 21 can be changed.

Here, as described above, the main feed rod 12
Is connected to a main feed adjusting link 21, and the main feed adjusting link 21 is supported by a support shaft 24. Therefore, the reciprocating motion of the main feed rod 12 is determined along the rotation locus of the main feed adjusting link 21 about the support shaft 24. Further, in order to change the rotation trajectory of the main feed adjustment link 21, the relative position of the support shaft 24 with respect to the main feed rod 12 is changed by rotating the main feed adjustment table 22, ie,
It becomes possible by changing the inclination angle of the main feed adjusting link 21 with respect to the horizontal plane. Therefore, by rotating the main feed adjusting screw 23 and rotating the main feed adjusting table 22 by a predetermined amount, the position of the support shaft 24 is changed, and the turning trajectory of the main feed adjusting link 21 is changed. The trajectory of the reciprocation of the rod 12 is changed.

The amount of movement of the main feed link 14 in the front-rear direction is changed by changing the trajectory of the reciprocating motion of the main feed rod 12, and the main feed link 14 is fitted around the main feed arm 13. The swing angle can be changed. Here, since the main feed shaft 1 and the differential feed shaft 2 are connected via a transmission mechanism 30 described later, the swing angle of the differential feed shaft 2 is changed by changing the swing angle of the main feed shaft 1. Will also be changed at the same time. Therefore, the swing angle of the main feed shaft 1 and the differential feed shaft 2 can be changed collectively by the main feed adjusting mechanism 20 having the above-described structure, and the main feed dog 4a and the differential feed dog 4b can be moved in the front-rear direction. Can be changed at once.

Next, the transmission mechanism 30 from the main feed shaft 1 to the differential feed shaft 2 (hereinafter referred to as "the transmission mechanism 30 to the differential feed shaft") will be described. Transmission mechanism 3 for differential feed shaft
0 is the tip of the first differential feed arm 31 fitted to the main feed shaft 1 and the second differential feed arm 32 fitted to the differential feed shaft 2
Is connected via a first differential feed link 33 and a second differential feed link. The first differential feed link 33 is rotatably connected at one end to the distal end of the first differential feed arm 31. Further, the second differential feed link 34 is rotatably connected at one end thereof to the tip end of the second differential feed arm 32. And the first differential feed link 33
And the second differential feed link 34 are rotatably connected at their other ends. One end of the first differential feed link 33 is formed in a substantially U shape, and the second differential feed link 3 is formed by this U-shaped portion.
4 and a differential feed adjusting link 51 to be described later are rotatably supported in a sandwiched state.

By using the transmission mechanism 30 for the differential feed shaft configured as described above, the first differential feed arm 31 fitted to the main feed shaft 1 with the swing of the main feed shaft 1 is also increased. Oscillating the first differential feed link 33 and the second differential feed link 34
, A reciprocating motion of a stroke corresponding to the swing amount of the first differential feed arm 31 occurs. And the second differential feed link 3
The distal end portion of the second differential feed arm 32 is pushed and pulled in the front-rear direction via 4, and the differential feed shaft 2 fitted to the second differential feed arm 32 swings around the axis. . The swing of the differential feed shaft 2 is caused by the swing arm 46 and the connecting link 4.
7 to the differential feed base 41, and the differential feed base 41
The differential feed dog 4b supported by the above moves back and forth.

Next, a description will be given of a differential feed adjusting mechanism 50 for changing only the amount of movement of the differential feed dog 4b in the front-rear direction by changing only the swing angle of the differential feed shaft 2. The differential feed adjusting mechanism 50 includes a differential feed adjusting link 5.
1, a differential feed adjusting table 52, a differential feed adjusting shaft 53, a differential feed adjusting lever 54, and the like. As shown in FIG. 4, one end of the differential feed adjusting link 51 has a first differential feed link 33 and a second differential feed link 34.
The other end is rotatably connected to the differential feed adjusting table 52 via a support shaft 55.

The differential feed adjusting table 52 is connected at one end to the differential feed adjusting link 51 via the support shaft 55 as described above, and at the other end, to the differential feed adjusting shaft 5.
3 rotatably supported. It should be noted that the differential feed adjusting shaft 53 has an operation feed adjusting lever 54 at its end.
And rotatably connected. Operation feed adjustment lever 54
(See FIG. 1) is disposed in a direction substantially perpendicular to the operation feed adjusting shaft 53, and one end (hereinafter, referred to as an "operation unit 54a") extends outward from the sewing machine bed B1. The other end is rotatably connected to the differential feed adjusting shaft 53 as described above. Also, the operation feed adjusting lever 5
Reference numeral 4 is supported on the sewing machine bed B1 by a shaft 54b. Therefore, when the operation portion 54a is moved up and down, the operation feed adjustment lever 54 rotates around the shaft 54b, and the differential feed adjustment shaft 53 connected to the differential feed adjustment lever 54, and furthermore, the differential feed adjustment table 52 Can be moved almost vertically.

Here, as described above, since the first differential feed link 33 is connected to the differential feed adjustment link 51 which is supported by the support shaft 55, the reciprocation thereof is restricted. That is, the reciprocating motion of the first differential feed link 33 is determined along the rotation locus of the differential feed adjustment link 51 about the support shaft 55. In order to change the rotation trajectory of the differential feed adjusting link 51, the differential feed adjusting table 52 is moved, and the relative position of the support shaft 55 with respect to the first differential feed link 33 is changed. It is possible to change the inclination angle of the feed adjusting link 51 with respect to the horizontal plane. Therefore,
The position of the support shaft 55 is changed by moving the operation section 54a of the operation feed adjustment lever up and down to move the differential feed adjustment table 52 by a predetermined amount, and the rotation locus of the differential feed adjustment link 51 is changed. . Then, when the rotation trajectory of the differential feed adjusting link 51 changes, the first differential feed link 3
The trajectory of the reciprocating motion of No. 3 is changed. Then, the amount of movement of the second differential feed link 34 in the front-rear direction is changed by changing the reciprocating locus of the first differential feed link 33, and the second differential feed link 34 is fitted to the second differential feed arm 32. The swing angle around the axis of the differential feed shaft 2 is changed. Therefore, only the swing angle of the differential feed shaft 2 is changed by the differential feed adjusting mechanism 50 having the above-described structure, and only the amount of movement of the differential feed dog 4b in the front-rear direction can be changed.

According to the feeder of the sewing machine shown in this embodiment, the differential feed amount is adjusted by the differential feed adjusting mechanism 50 by using the differential feed adjusting table 52 and the differential feed adjusting link 51. This eliminates the need to use members that slide with each other during sewing work, such as a slider and an adjusting arm, which are conventionally used, and suppresses abrasion of members constituting the differential feed adjustment mechanism 50. can do.
In addition, since the transmission mechanism 30 to the differential feed shaft and the differential feed adjustment mechanism 50 are disposed on the right side in front view with respect to the needle drop position, the left portion with respect to the needle drop position can be shortened. That is, since the length of the leftward extension from the needle drop position can be shortened, the handleability of the workpiece during sewing is improved.

In this embodiment, the differential feed adjusting mechanism 50 in the case where the differential feed shaft 2 is located on the front side with respect to the main feed shaft 1 when viewed in a plane has been described. However, the present invention is not limited to this.
May be located on the rear side with respect to the main feed shaft 1. Further, the movement of the differential feed adjusting table 52 is performed by using the differential feed adjusting shaft 53 and the differential feed adjusting lever 54. However, the present invention is not limited to this. For example, the main feed adjusting mechanism of the present embodiment is used. A means that can move the differential feed adjusting table 52 to an arbitrary position, such as using an adjusting screw and a spring as used in 20, may be used. In addition, the transmission mechanism 30 to the differential feed shaft and the differential feed adjustment mechanism 50 are arranged on the right side with respect to the needle drop position, but are not limited to this.
It may be arranged on the left side of the needle drop position. Further, as shown in the present embodiment, the present invention is not limited to a cylinder-type sewing machine feeding device having a cylinder bed portion protruding in a horizontal direction from a sewing machine bed main body portion. Of the sewing machine.

[0034]

According to the feeder of the sewing machine of the first aspect, the differential feed adjusting mechanism includes a differential feed adjusting link.
That is, since the differential feed adjusting mechanism is constituted by a link mechanism, it is not necessary to use members that slide with each other during sewing work, such as a slider and an adjusting arm, which are conventionally used. It is possible to suppress abrasion of members constituting the adjustment mechanism.

According to the second aspect of the present invention, the same effect as in the first aspect can be obtained, and the transmission mechanism and the differential feed adjusting mechanism constitute a four-joint link mechanism. The structure of the device can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire configuration of a feeder of a sewing machine according to an embodiment.

FIG. 2 is a perspective view of a main part showing a feeding device of the sewing machine according to the embodiment.

FIG. 3 is a perspective view of a main part showing a feeding device of the sewing machine according to the embodiment.

FIG. 4 is a perspective view of a main part showing a differential feed adjusting mechanism.

FIG. 5 is a perspective view showing the entire configuration of a conventional sewing machine feeding device.

FIG. 6 is a side view of a main part showing a conventional differential feed adjusting mechanism.

FIG. 7 is a side view of a main part showing a conventional differential feed adjusting mechanism.

[Explanation of symbols]

 Reference Signs List 1 main feed shaft 2 differential feed shaft 4a main feed dog 4b differential feed dog 20 main feed adjustment mechanism 30 transmission mechanism (transmission mechanism to differential feed axis) 31 first differential feed arm 32 second differential Feed arm 33 First differential feed link 34 Second differential feed link 50 Differential feed adjustment mechanism 51 Differential feed adjustment link 54 Differential feed adjustment lever 55 Support shaft

Claims (2)

[Claims] 1. A differential feed shaft and a main feed shaft that oscillate around respective axes for moving a differential feed dog and a main feed dog for feeding a material to be moved forward and backward, respectively, and a swing of the main feed shaft. A transmission mechanism for transmitting the motion to the differential feed shaft via a plurality of connecting members;
The swing angle of the differential feed shaft and the main feed shaft is changed collectively, and the main feed adjustment mechanism that adjusts the amount of forward and backward movement of the differential feed dog and the main feed dog, and only the swing angle of the differential feed shaft And a differential feed adjusting mechanism for changing the front-rear operation amount of the differential feed dog relative to the front-rear operation amount of the main feed dog, wherein the differential feed adjustment mechanism comprises: A differential feed adjusting link rotatably connected at one end to a connecting point between the connecting members constituting the power transmission mechanism while being movably supported by a support shaft at the other end; The movement trajectory of the member is determined by the rotation of the differential feed adjustment link around the support shaft, and the member is moved by moving the support shaft to change the inclination angle of the differential feed adjustment link with respect to the horizontal plane. The moving trajectory of the connecting member is adjusted. Feeder of sewing machine. 2. The feeder of a sewing machine according to claim 1, wherein the coupling member of the transmission mechanism is configured to connect a first differential feed arm joined to a main feed shaft, a first differential feed arm, and a rotating member. A first differential feed link movably connected, a second differential feed link rotatably connected to the first differential feed link, and a rotatable connection to the second differential feed link. And a second differential feed arm joined with the differential feed shaft, wherein the differential feed adjustment link is provided at a connection point between the first differential feed link and the second differential feed link. A feeding device for a sewing machine, which is connected.