JPH078653A - Feed generating mechanism of sewing machine - Google Patents

Abstract

PURPOSE:To smooth sloth-feeding without being influenced by vibration and strain generated in sewing by forming a mounting hole having a swing pin vertically slidable therein of a groove part formed of a cam carrier and a cam holding plate provided with a hole part through which a lower shaft extends. CONSTITUTION:A mounting hole 15 thorugh which a swing pin 9 driven by the outer peripheral surface of an eccentric cam 11 slides vertically is composed of a groove part 12b formed in a cam carrier 12 and a cam holding plate 13 provided with a hole part 13b thorugh which a lower shaft 14 can extend. The mounting hole 15 formed of the groove part 12b provided in the cam carrier 12 and the cam holding plate 13 is isolated from a throat plate bed 4 for supporting the throat plate 5 which receives a piercing force generated by a needle piercing sewings. Since the swing pin 9 does not receive directly vibration, impact, etc., to be cause by the piercing force, the swing pin 9 can stably move in the mounting hole 15. Thus, the swing pin 9 can generate the smooth cloth feeding motion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed motion generating mechanism for a sewing machine, and more particularly to a feed motion generating mechanism arranged at the tip of a tubular bed sewing machine suitable for sewing bags.

[0002]

2. Description of the Related Art FIGS.
It is a figure which shows the prior art known by 35728.
FIG. 10 is a front view of a conventional tubular bed sewing machine, and the front end portion of the sewing machine bed is located above the sewing machine table surface. Further, FIG. 11 is a plan view of the essential parts showing the feed motion generating mechanism of the sewing machine at the tip portion of the sewing machine bed as seen from the direction of arrow A in FIG. 10, and FIG. 12 is a view in FIG. It is a XX sectional view. 13 is a vertical cross-sectional view of the main constituent elements of the feed motion generating mechanism of the sewing machine in FIG. 11, and FIG. 14 is an exploded perspective view of the main constituent elements of the feed motion generating mechanism of the sewing machine in FIG.

In the figure, 2 is a cylindrical machine bed machine frame attached to the bottom of the sewing machine main body 2A, 7 is a feed arm pivotally supported on the machine bed machine frame 2 at one end (right end in the figure), Reference numeral 6 denotes a feed dog fixed to the upper surface of the other end of the feed arm 7 with a screw 8 and operates integrally with the feed arm 7. Also,
Reference numeral 4 is a needle plate base, 5 is a needle plate, and 9c is a rocking pin fitted into a mounting hole 4b provided in the needle plate base 4 supporting the needle plate 5, and the upper end of the rocking pin 9c is fed. The lower end of the swing pin 9c abuts on the lower surface of the tip end of the arm 7, and the outer peripheral surface of the eccentric cam 11 abuts on the lower end. The swinging pin 9c reciprocates in the vertical direction by the rotation of the eccentric cam 11. Following this, the tip of the feed arm 7 also reciprocates in the vertical direction, and the feed dog 6 is moved. Reciprocate up and down.

Further, 14 is a lower shaft for driving the eccentric cam 11, the hook body (not shown), etc., and the gear portion 1 of the lower shaft 14 is shown.
Reference numeral 4a denotes a gear portion 11 provided on the inner peripheral surface of the eccentric cam 11.
The eccentric cam 11 is rotated by meshing with a. A cam receiver 12c is attached to the sewing machine bed machine frame 2 and accommodates the eccentric cam 11. The opening 12d above the cam receiver 12c is covered with the needle plate base 4. 13 is a cam pressing plate, 20 is a thread scrap or other foreign matter from the direction of the hook,
A washer that prevents the eccentric cam 11 from entering the periphery of the eccentric cam 11 and is interposed between the pressing lid 16 and the cam pressing plate 13.
Reference numeral 18 denotes a horizontal feed shaft that gives a horizontal reciprocating motion to the feed dog 6 through the connecting means 10. The horizontal motion and the above-mentioned vertical reciprocating motion cause the feed dog 6 to have an elliptical motion, that is, a cloth. Perform four feeding movements to feed fabrics.

On the other hand, FIG. 15 is an explanatory view of the front of the main portion of the tip end portion of the tubular bed sewing machine showing the state of attachment of the conventional needle plate base 4. The needle plate base 4 has a mounting hole 4 into which the swing pin 9c is fitted and supported.
At a position rearward from the position b (right side in FIG. 15), it is attached to the upper surface of the tip of the tubular machine bed machine frame 2 and extends like a cantilever over the cam receiver 12c, the cam pressing plate 13 and the like. It supports the needle plate 5 which is composed of a large arm and receives the pressure P generated by sewing.

[0006]

However, in the above-mentioned conventional feed motion generating mechanism of the sewing machine, the needle which receives vibrations or impacts caused by the pressure P such as the penetrating force generated when the needle penetrates the sewing material. Mounting hole 4b for needle plate base 4 supporting plate 5
Since the swing pin 9c is supported only by
Is affected by the vibration at the time of sewing transmitted from the needle plate 5,
The elliptical motion is performed while slightly vibrating (chattering vibration). That is, it is assumed that a slight vibration is superimposed on the elliptical locus of the four cloth feed movements, and as a result, if the vibration is large, smooth cloth feed cannot be performed.

Further, in order to obtain a smooth cloth feeding elliptic movement, it is necessary to dispose the mounting hole 4b into which the swinging pin 9c is fitted and supported immediately above the center of rotation of the eccentric cam 11. However, the mounting hole 4b is provided in the needle plate base 4 that supports the needle plate 5, and it takes time to adjust the positioning of the needle plate base 4 and its maintenance in relation to the positions of the feed dog 6 and the needle drop. become. Further, since the upper part of the cam receiver 12c for accommodating the eccentric cam 11 is open, there is a chance that foreign matter may enter when the needle plate base 4 is attached or disassembled, and the eccentric cam 11 may be locked. Therefore, special consideration must be given to the work.

Further, the pressing force for fixing the sewn product necessary for sewing acts on the needle plate base 4 via the needle plate 5, and the needle plate base 4 protruding like a cantilever is formed on the needle plate base 4 in FIG. Since it is bent as shown in FIG. 5, the mounting hole 4b provided in the needle plate base 4 is inclined or deformed, and the swing pin 9 reciprocates along the mounting hole 4b.
c cannot exercise normally. As a result, smooth cloth feeding cannot be performed. Further, by eliminating the gap B between the lower surface of the needle plate base 4 and the upper surface of the cam receiver 12c shown in FIG.
In order to reduce the amount of bending of the needle plate base 4, the plane of attachment of the needle plate base 4 of the sewing machine bed machine frame 2 and the flat surface of the upper end of the cam receiver 12c are taken into consideration while considering the rotation center position of the eccentric cam 11. Since they need to be on the same plane, not only high-precision parts are required, but also the attachment and adjustment of the parts are troublesome.

Therefore, according to the present invention, the swing pin driven by the eccentric cam is made less susceptible to the influence of vibration and distortion generated at the time of sewing to make the cloth feeding motion smooth, and the assembly adjustment and its workability are exceptional. An object of the present invention is to provide a feed motion generating mechanism of a sewing machine that does not require consideration.

[0010]

According to a first aspect of the present invention, there is provided a feed motion generating mechanism for a sewing machine, wherein a mounting hole in which a swing pin slides vertically has a hole formed in a cam receiver and a hole through which a lower shaft can pass. And a cam pressing plate provided with.

In the feed motion generating mechanism of the sewing machine according to the second aspect of the present invention, the mounting hole for the swinging pin to slide up and down has a cam pressing plate provided with a groove formed in the cam receiver and a hole through which the lower shaft can penetrate. And the rocking pin is formed shorter than the depth of the mounting hole.

In the feed motion generating mechanism of the sewing machine according to the third aspect of the present invention, the mounting hole for the rocking pin to slide up and down has a cam pressing plate having a groove formed in the cam receiver and a hole through which the lower shaft can penetrate. And the end face opposite to the outer peripheral face of the eccentric cam abutted on the feed arm.

In the feed motion generating mechanism of the sewing machine according to a fourth aspect of the present invention, the mounting hole for the rocking pin to slide up and down has a cam pressing plate having a groove formed in the cam receiver and a hole through which the lower shaft can penetrate. And the end face opposite to the outer peripheral face of the eccentric cam is brought into contact with the feed dog.

In the feed motion generating mechanism of the sewing machine according to a fifth aspect of the present invention, the mounting hole forming member for accommodating the outer circumference of the swinging pin that slides up and down is at least a groove portion projecting the cam receiver, and The member for forming the mounting hole is formed so as to protrude from a hole provided in the needle plate base supporting the needle plate with a predetermined gap.

[0015]

According to the first aspect of the present invention, the cam retainer is provided with a groove formed in the cam receiver and a hole through which the lower shaft can pass, through a mounting hole through which an oscillating pin that follows the outer peripheral surface of the eccentric cam slides vertically. The mounting hole formed by the cam plate and the groove formed in the cam receiver and the cam retainer plate is a needle plate base that supports the needle plate that receives a penetrating force generated when the needle penetrates the sewn product. Since it is isolated from each other and is not directly subjected to vibrations and impacts due to penetrating force and the like, the swing pin can stably move in the mounting hole.

According to a second aspect of the present invention, the mounting hole through which the swing pin slides up and down is formed by the groove portion formed in the cam receiver and the cam holding plate provided with the hole portion through which the lower shaft can penetrate. Since the swing pin is short with respect to the depth of the mounting hole, when the swing pin is descending, it is possible to set the needle plate base that supports the needle plate regardless of the position of the sliding mounting hole. . Further, the locus of movement of the feed dog becomes a semicircular locus.

According to a third aspect of the present invention, the mounting hole in which the swing pin slides up and down is formed by a groove formed in the cam receiver and a cam retainer plate provided with a hole through which the lower shaft can penetrate. Since the end face opposite to the outer peripheral face of the contact plate is contacted with the feed arm, the needle plate base for supporting the needle plate is set regardless of the position of the mounting hole where the swing pin slides. be able to.
Moreover, since there is no opening in the upper part of the cam receiver that accommodates the eccentric cam, it is possible to prevent foreign matter from entering the inside of the cam receiver.

According to a fourth aspect of the present invention, the mounting hole for the rocking pin to slide up and down is formed by a groove portion formed in the cam receiver and a cam holding plate provided with a hole portion through which the lower shaft can penetrate. Since the end face opposite to the outer peripheral face of the cam is brought into contact with the feed dog, the needle plate base that supports the needle plate is set regardless of the position of the mounting hole where the swing pin slides. can do. Moreover, since there is no opening in the upper part of the cam receiver that accommodates the eccentric cam, it is possible to prevent foreign matter from entering the inside of the cam receiver.

According to a fifth aspect of the present invention, at least a member having a mounting hole for accommodating the outer periphery of the vertically movable rocking pin,
Since the cam receiver is formed as a protruding groove and the mounting hole forming member is formed so as to protrude with a predetermined gap from the hole provided in the needle plate base supporting the needle plate, It is possible to reduce the amount of strain that the pressing force acts on the moving pin.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment relating to a feed motion generating mechanism of a sewing machine of the present invention will be described below with reference to the drawings. In the figure,
The same reference numerals and symbols as those of the conventional example show the same or corresponding components as those of the conventional example.

<Embodiment 1> FIG. 1 is a view showing a feed motion generating mechanism of a sewing machine, which corresponds to a front end portion of a sewing machine bed as seen from an arrow A in FIG. 2 is an exploded perspective view of main components of the feed motion generating mechanism of the sewing machine according to the first embodiment of the present invention. 3 is a cross-sectional view taken along the line YY in FIG. 1 at the time of cloth feed forward movement illustrating the positional relationship between the needle plate 5 and the feed dog 6.
FIG. 4 is a sectional view taken along the line YY in FIG. 1 at the time of cloth feed backward movement, which illustrates the positional relationship between the needle plate 5 and the feed dog 6. In FIGS. 1 and 2, 9 is a rocking pin formed of a substantially rectangular parallelepiped, 12 is a cam receiver having a projecting support portion 12 a and a groove portion 12 b formed therein which is in contact with the three faces of the rocking pin 9, and 13 is a cam receiver 12. The cam holding plate is provided with a guide portion 13a that closes the groove portion 12b and a hole portion 13b through which the lower shaft 14 can pass. The rocking pin 9 is provided with a groove 12b provided in a supporting portion 12a of a cam receiver 12 which is laterally fixed to the machine bed machine frame 2 with a screw 22, a pressing lid 16 and a washer 20, and the cam receiver 12 with a screw 21. And a guide portion 13a of a cam holding plate 13 attached to the mounting hole 15 which is vertically slidable.

Reference numeral 16 is a pressing lid, and 19 is a hook cover for covering the hook body 17 and the like. The opening of the hook cover 19 that covers the hook 17 and the like is provided with a support portion 12a and a guide portion 1 in a hole portion 4a provided in the needle plate base 4 that is supported by the left and right mounting grooves.
It is attached so as not to contact 3a. Further, the needle plate base 4 supports the needle plate 5 fixed by the screw 1, and
It is fixed to the machine bed frame 2 by. The washer 20 is interposed between the presser lid 16 and the cam retainer plate 13 to prevent the thread scraps and other foreign matter from entering the periphery of the eccentric cam 11 from the direction of the shuttle body 17. By disposing the mounting portion 17a of the shuttle 17 in the hole 16a having a larger diameter than the mounting portion 17a of the shuttle body 17 provided in the presser lid 16, the shuttle body 17 is brought closer to the bearing portion 2b, and the tip of the lower shaft 14 is moved. It prevents whirling of the hook body 17 attached to the.

A semi-circular movement locus of the feed dog 6 in the tubular bed sewing machine will be described with reference to FIGS. 3 and 4. FIG. 3 shows a state at the time of forward movement of the cloth feed, in which the swing pin 9
Is a groove portion 12 provided in the support portion 12a of the cam receiver 12.
b and the guide portion 13a of the cam holding plate 13 are vertically slidably inserted into the mounting hole 15, and the upper end abuts the lower surface of the feed arm 7 and the lower end abuts the outer peripheral surface of the eccentric cam 11. ing. At this time, the feed dog 6 projecting from the upper surface of the needle plate 5 is moved by this horizontal movement and the above-described vertical reciprocating movement by the horizontal feed shaft 18 that reciprocates in the horizontal direction via the connecting means 10 shown in FIG. , Move the sewing material (not shown) forward (to the left in the figure). This state corresponds to the curved section of the movement trajectory 26 of the feed dog 6.

FIG. 4 shows a state when the cloth feed is in the backward movement, in which the upper end of the support portion 12a and the lower surface of the feed arm 7 are in contact with each other. At this time, the tooth portion of the feed dog 6 is located below the upper surface of the needle plate 5 and moves back (to the right in the drawing) without affecting the sewn product (not shown). This is the movement trajectory 2 of the feed dog 6.
It corresponds to a straight line section of 6.

As described above, in this embodiment, the gear portion 14a is provided in the vicinity of the end portion, and the lower shaft 14 that transmits the driving energy for feeding the cloth and the gear portion 11a that meshes with the gear portion 14a of the lower shaft 14 are provided. An eccentric cam 11 formed on the inner peripheral surface thereof, a cam receiver 12 rotatably accommodating the eccentric cam 11, a swing pin abutting on the outer peripheral surface of the eccentric cam 11 and driven by the outer peripheral surface of the eccentric cam 11. In the feed motion generating mechanism of the sewing machine including 9 and 9, the mounting hole 15 through which the swing pin 9 slides vertically is
The groove 12b is formed on the cam receiver 12, and the cam holding plate 13 is provided with a hole 13b through which the lower shaft 14 can penetrate, and corresponds to the embodiment of claim 1.

Therefore, the mounting hole 15 formed by the groove 12b provided on the cam receiver 12 mounted on the sewing machine bed machine frame 2 and the cam holding plate 13 is a penetrating hole generated when the needle penetrates the sewn product. The oscillating pin 9 stabilizes the mounting hole 15 because it is isolated from the needle plate base 4 that supports the needle plate 5 that receives force and is not directly subjected to vibrations and impacts due to the penetrating force and the like. It can be vertical movement. Also,
Since the needle plate base 4 that supports the needle plate 5 is fixed to the sewing machine bed machine frame 2, vibrations and impacts due to the penetrating force generated when the needle penetrates the sewn product, the sewing machine is a rigid machine. Although transmitted to the bed machine frame 2, since there is a boundary surface between the sewing machine bed machine frame 2 and the cam receiver 12, the groove portion 12b provided in the cam receiver 12 inserted into the sewing machine bed machine frame 2 is provided. The mounting hole 15 formed by the cam holding plate 13 and
It is possible to avoid the above-mentioned vibration and impact. That is, since the swing pin 9 can move stably in the mounting hole 15, accurate and smooth cloth feeding movement can be performed. In the present embodiment, the movement locus of the semicircular feed dog has been described, but in the case of carrying out the invention of claim 1, the supporting portion 12a is used.
Since the height of the feed dog can be arbitrarily determined, it is possible to make not only the locus of movement of the semicircular feed dog, but also the locus of movement of the elliptical feed dog.

In this embodiment, the gear portion 14 is provided near the end.
a, the eccentric cam 11 in which the lower shaft 14 for transmitting drive energy for feeding the cloth, the eccentric cam 11 in which the gear portion 11a meshing with the gear portion 14a of the lower shaft 14 is formed on the inner peripheral surface, and the eccentric cam 1
Cam receiver 12 for rotatably accommodating 1 and eccentric cam 11
In the feed motion generating mechanism of the sewing machine, which is in contact with the outer peripheral surface of the eccentric cam 11 and is driven by the outer peripheral surface of the eccentric cam 11, the mounting hole 15 in which the oscillating pin 9 slides up and down is provided with the cam receiver 12. Formed by the groove 12b formed on the lower side and the cam holding plate 13 having the hole 13b through which the lower shaft 14 can penetrate, and the swing pin 9 is formed shorter than the depth of the mounting hole 15. And corresponds to the embodiment described in claim 2. Therefore, when the feed dog 6 moves forward, an elliptical locus is drawn,
Since the linear movement is performed during the backward movement, it is possible to perform the proper cloth feeding movement without lowering more than necessary. Further, since the friction time between the swing pin 9 and the feed arm 7 is shortened, the friction state is improved and the durability of the constituent members is improved.

<Embodiment 2> Next, a flat bed type feed motion generating mechanism shown in FIG. 5 will be described. FIG. 5 is an explanatory view of the feed motion generating mechanism of the sewing machine according to the second embodiment of the present invention. In FIG. 5, 23 is a feed base that moves up and down by a swing pin 9 that is driven by the eccentric cam 11, 24 is a bearing that can move in the vertical direction, and 25 is an urging body including a spring or the like. Here, the feed dog 6 is fixed by a screw 8 to a feed base 23 which is supported by a bearing 24 so as to be vertically movable. The upper end of the rocking pin 9 that slides in the mounting hole 15 and follows the eccentric cam 11 comes into contact with the feed dog 6 attached to the feed base 23 that is urged downward by the urging body 25 to move up and down. Give. Then, the connecting means 10 shown in FIG.
The horizontal feed shaft 18 that reciprocates in the horizontal direction via the horizontal feed means that cooperates with the horizontal moving means including the bearing 24 and the biasing body 25, and the feed dog 6 protruding from the upper surface of the needle plate 5 is The horizontal movement and the reciprocating movement in the vertical direction generate an elliptical movement of the cloth feed.

As described above, in this embodiment, the gear portion 14a is provided in the vicinity of the end portion, and the lower shaft 14 that transmits the driving energy for feeding the cloth and the gear portion 11a that meshes with the gear portion 14a of the lower shaft 14 are provided. An eccentric cam 11 formed on the inner peripheral surface thereof, a cam receiver 12 rotatably accommodating the eccentric cam 11, a swing pin abutting on the outer peripheral surface of the eccentric cam 11 and driven by the outer peripheral surface of the eccentric cam 11. In the feed motion generating mechanism of the sewing machine including 9 and 9, the mounting hole 15 through which the swing pin 9 slides vertically is
A groove 12b formed in the cam receiver 12 and a cam holding plate 13 having a hole 13b through which the lower shaft 14 can penetrate are formed, and the opposite end surface of the eccentric cam 11 abutting against the outer peripheral surface of the feed arm is formed. 7, which corresponds to the embodiment described in claim 3.

Therefore, since the needle plate base 4 supporting the needle plate 5 is fixed to the sewing machine bed machine frame 2, there is no vibration or impact due to the penetrating force generated when the needle penetrates the sewn product. , Which is transmitted to the machine bed frame 2 which is a rigid body,
Since there is a boundary surface between the sewing machine bed machine frame 2 and the cam receiver 12, it is formed by the groove portion 12 b provided on the cam receiver 12 inserted into the sewing machine bed machine frame 2 and the cam holding plate 13. The mounting hole 15 can avoid the above-mentioned vibration and impact. That is, since the swing pin 9 can move stably in the mounting hole 15, accurate and smooth cloth feeding movement can be performed. Further, since the needle plate base 4 supporting the needle plate 5 can be mounted regardless of the position of the mounting hole 15 on which the swing pin 9 slides, the time for adjusting the positioning of the needle plate base 4 can be reduced. Then, a cam receiver 12 that accommodates the eccentric cam 11
Since there is no opening in the upper part of the above, it is possible to prevent a situation in which foreign matter enters the inside of the cam receiver 12 and the eccentric cam 11 is locked, and reliability is improved. Particularly, in this embodiment, the swing pin 9 can be easily replaced by simply removing the screw 8 and the feed dog 6.

<Third Embodiment> Next, the feed motion generating mechanism of the tubular bed sewing machine shown in FIG. 6 will be described. FIG. 6 illustrates the positional relationship between the needle plate and the feed dog in the feed motion generating mechanism of the sewing machine according to the third embodiment of the present invention.
9 is a cross-sectional view corresponding to the cross section along line YY in FIG. In the figure, the swing pin 9a that slides up and down in the mounting hole 15 is wider than the feed arm 7 to which the feed dog 6 is attached, and the eccentric cam 1
It is formed in a long rectangular shape along the tangential direction of 1.
The upper end of the swinging pin 9a contacts the lower surface of the feed arm 7, and the lower end contacts the outer peripheral surface of the eccentric cam 11.

As described above, in this embodiment, the gear portion 14a is provided near the end portion, and the lower shaft 14 that transmits the driving energy for feeding the cloth and the gear portion 11a that meshes with the gear portion 14a of the lower shaft 14 are provided. An eccentric cam 11 formed on the inner peripheral surface thereof, a cam receiver 12 rotatably accommodating the eccentric cam 11, a swing pin abutting on the outer peripheral surface of the eccentric cam 11 and driven by the outer peripheral surface of the eccentric cam 11. 9a, in the feed motion generation mechanism of the sewing machine, the mounting hole 15 through which the swing pin 9a slides up and down.
Is the groove 12b formed in the cam receiver 12 and the lower shaft 14
And a cam pressing plate 13 provided with a hole portion 13b through which a hole can penetrate, and an end face opposite to the outer peripheral face of the eccentric cam 11 is brought into abutment with the feed arm 7. Corresponding to the embodiment.

Particularly, in this embodiment, when the feeding arm 7 moves in the horizontal direction, the feeding arm 7 is prevented from falling around the swing pin 9a, so that the cloth feeding movement is stabilized. Also, the feed arm 7
It is possible to increase the contact area between the lower surface of the rocking pin and the swing pin 9a, alleviate the frictional state, and suppress the progress of wear. The oscillating pin 9a having a rectangular shape that is long along the tangential direction of the eccentric cam 11 has a center of the oscillating pin 9a displaced from the rotation center of the eccentric cam 11 within a range of 1/2 of the rectangular dimension. However, since the lower end of the swing pin 9a abuts and follows the eccentric cam 11 while maintaining a constant contact area, the position of the mounting hole 15 where the swing pin 9a slides with respect to the rotation center of the eccentric cam 11. The accuracy can be relaxed. Also, for example, the feed dog 6
When the lower surface of the feed arm 7 to which is attached and the upper end of the swing pin 9a come into contact with each other, the swing pin 9a is long in the horizontal direction of the elliptical movement of the cloth feed, so that the feed arm around the swing pin 9a is long. The inclination of 7 can be prevented, the horizontal movement of the feed can be stabilized, and an accurate cloth feed elliptical movement can be generated.

<Embodiment 4> Next, the feed motion generating mechanism of the tubular bed sewing machine shown in FIG. 7 will be described. FIG. 7 shows the positional relationship between the needle plate and the feed dog in the feed motion generating mechanism of the sewing machine according to the fourth embodiment of the present invention, and FIG.
9 is a cross-sectional view corresponding to the cross section along line YY in FIG. The upper surface of the rocking pin 9b, which is formed in the shape of a rectangular rectangle along the tangential direction of the eccentric cam 11, is inclined downward to the right in the figure.
Further, the lower end of the swing pin 9b abuts on the outer peripheral surface of the eccentric cam 11, the upper end abuts on the lower surface of the feed arm 7, and the feed arm 7 inclines along the slope of the upper surface of the swing pin 9b.

As described above, in this embodiment, the gear portion 14a is provided in the vicinity of the end portion, and the lower shaft 14 that transmits the driving energy for feeding the cloth and the gear portion 11a that meshes with the gear portion 14a of the lower shaft 14 are provided. An eccentric cam 11 formed on the inner peripheral surface thereof, a cam receiver 12 rotatably accommodating the eccentric cam 11, a swing pin abutting on the outer peripheral surface of the eccentric cam 11 and driven by the outer peripheral surface of the eccentric cam 11. 9b, in a feed motion generating mechanism of a sewing machine, a mounting hole 15 through which a swing pin 9b slides up and down.
Is the groove 12b formed in the cam receiver 12 and the lower shaft 14
And a cam pressing plate 13 provided with a hole portion 13b through which a hole can penetrate, and an end face opposite to the outer peripheral face of the eccentric cam 11 is brought into abutment with the feed arm 7. Corresponding to the embodiment. In particular, the feed dog 6 makes a cloth feed motion in a so-called forward-raising state, as shown by a movement trajectory 26 of the feed dog. In the present embodiment, the movement locus 26 of the feed dog has a semi-circular shape, but in the case of implementing the present invention, the height of the support portion 12a forming the mounting hole 15 can be arbitrarily determined. It is also possible to create not only a semicircular feed dog movement locus, but also an elliptical feed tooth movement locus.

<Embodiment 5> Next, the feed motion generating mechanism of the tubular bed sewing machine shown in FIG. 8 will be described. FIG. 8 shows the positional relationship between the needle plate and the feed dog in the feed motion generating mechanism of the sewing machine according to the fifth embodiment of the present invention, and FIG.
9 is a cross-sectional view corresponding to the cross section along line YY in FIG. As shown in FIG. 8, the swing pin 9 that slides in the mounting hole 15 is configured such that the protruding support portion 12a of the cam receiver 12 is inserted into the hole portion 4a provided in the needle plate base 4 so that the support portion 12a Feeding arm 7 on top
Is provided and is inserted through the hole 7a formed in the feed arm 7, and abuts against the feed dog 6 attached to the feed arm 7 from below.

As described above, in this embodiment, the gear portion 14a is provided in the vicinity of the end portion, and the lower shaft 14 that transmits the driving energy for feeding the cloth and the gear portion 11a that meshes with the gear portion 14a of the lower shaft 14 are provided. An eccentric cam 11 formed on the inner peripheral surface thereof, a cam receiver 12 rotatably accommodating the eccentric cam 11, a swing pin abutting on the outer peripheral surface of the eccentric cam 11 and driven by the outer peripheral surface of the eccentric cam 11. In the feed motion generating mechanism of the sewing machine including 9 and 9, the mounting hole 15 through which the swing pin 9 slides vertically is
A groove 12b formed in the cam receiver 12 and a cam retainer plate 13 having a hole 13b through which the lower shaft 14 can penetrate are formed. 6 is brought into contact with the nozzle 6 and corresponds to the embodiment described in claim 4.

Therefore, since the needle plate base 4 which supports the needle plate 5 is fixed to the sewing machine bed machine frame 2, there is no vibration or impact due to the penetrating force generated when the needle penetrates the sewn product. , Which is transmitted to the machine bed frame 2 which is a rigid body,
Since there is a boundary surface between the sewing machine bed machine frame 2 and the cam receiver 12, it is formed by the groove portion 12 b provided on the cam receiver 12 inserted into the sewing machine bed machine frame 2 and the cam holding plate 13. The mounting hole 15 can avoid the above-mentioned vibration and impact. That is, since the swing pin 9 can move stably in the mounting hole 15, accurate and smooth cloth feeding movement can be performed. Further, since the needle plate base 4 supporting the needle plate 5 can be mounted regardless of the position of the mounting hole 15 on which the swing pin 9 slides, the time for adjusting the positioning of the needle plate base 4 can be reduced. Then, a cam receiver 12 that accommodates the eccentric cam 11
Since there is no opening in the upper part of the above, it is possible to prevent a situation in which foreign matter enters the inside of the cam receiver 12 and the eccentric cam 11 is locked, and reliability is improved. In particular, also in this embodiment, similarly, the swing pin 9 can be easily replaced only by removing the feed dog 6.

<Embodiment 6> Next, the structure of the tip portion of the tubular bed sewing machine shown in FIG. 9 will be described. FIG. 9 is an explanatory view of the front of the main part of the leading end of the tubular bed sewing machine showing the state of attachment of the needle plate base in the feed motion generating mechanism of the sewing machine according to the sixth embodiment of the present invention. In the figure, the pressure P generated by sewing
The needle plate base 4 that supports the needle plate 5 that receives the needle plate base 4 has a protrusion 12a that forms a groove 12b that is provided above both sides of the cam receiver 12 that is attached to the machine bed machine frame 2.
Is attached to the upper surface of. Further, the needle plate base 4 forms a gap between the support portion 12a of the cam receiver 12 forming the mounting hole 15 in which the swing pin 9 is slidably supported and the guide portion 13a of the cam holding plate 13. , And has a hole 4a provided so as not to contact.

As described above, in this embodiment, the gear portion 14a is provided in the vicinity of the end portion, and the lower shaft 14 that transmits the driving energy for feeding the cloth and the gear portion 11a that meshes with the gear portion 14a of the lower shaft 14 are provided. An eccentric cam 11 formed on the inner peripheral surface thereof, a cam receiver 12 rotatably accommodating the eccentric cam 11, a swing pin abutting on the outer peripheral surface of the eccentric cam 11 and driven by the outer peripheral surface of the eccentric cam 11. In the feed motion generating mechanism of the sewing machine, the member for forming the mounting hole 15 for accommodating the outer periphery of the swinging pin 9 that slides up and down is at least the groove portion 12b from which the cam receiver 12 is projected, and The mounting hole 15 is formed so as to protrude from a hole portion 4a provided on the needle plate base 4 supporting the needle plate 5 with a predetermined gap. Corresponds to the example.

Therefore, since the needle plate base 4 supporting the needle plate 5 is fixed to the sewing machine bed machine frame 2, there is no vibration or impact due to the penetrating force generated when the needle penetrates the sewn product. , Which is transmitted to the machine bed frame 2 which is a rigid body,
Since there is a boundary surface between the sewing machine bed machine frame 2 and the cam receiver 12, it is formed by the groove portion 12 b provided on the cam receiver 12 inserted into the sewing machine bed machine frame 2 and the cam holding plate 13. The mounting hole 15 can avoid the above-mentioned vibration and impact. That is, since the mounting hole 15 is not affected by the pressure P, the swing pin 9 can normally move. Moreover, since the distance between the point of action of the pressure P and the needle plate base fulcrum C can be shortened, the strain of the cantilever needle plate base 4 due to the pressure P can be reduced. Since the swing pin 9 can move stably in the mounting hole 15, accurate and smooth cloth feeding movement can be performed. Further, since the needle plate base 4 supporting the needle plate 5 can be mounted regardless of the position of the mounting hole 15 on which the swing pin 9 slides, the time for adjusting the positioning of the needle plate base 4 can be reduced. Further, since there is no opening in the upper part of the cam receiver 12 that houses the eccentric cam 11, it is possible to prevent foreign matter from entering the inside of the cam receiver 12 and lock the eccentric cam 11, which improves reliability.

[0042]

As described above, in the feed motion generating mechanism of the sewing machine according to the first aspect of the present invention, the cam receiving member is formed with the mounting hole in which the swing pin driven by the outer peripheral surface of the eccentric cam slides up and down. The mounting hole is formed by the groove and the cam retainer plate with a hole through which the lower shaft can penetrate.The mounting hole formed by the groove and the cam retainer plate on the cam receiver is used when the needle penetrates the sewing product. Since it is isolated from the needle plate base that supports the needle plate that receives the penetrating force, etc., it does not directly receive vibrations and impacts due to the penetrating force, etc.
The swing pin can move stably in the mounting hole. In particular,
Since the needle plate base that supports the needle plate is fixed to the sewing machine bed frame, vibrations and shocks caused by the penetrating force generated when the needle penetrates the sewing material cause a rigid sewing machine bed frame. However, since there is an interface between the machine bed frame and the cam receiver, it is defined by the groove provided on the cam receiver that is inserted into the machine bed frame and the cam retainer plate. The mounting hole can avoid vibration and shock. That is, since the swing pin can move stably in the mounting hole, accurate and smooth cloth feeding movement can be achieved.

In the feed motion generating mechanism of the sewing machine according to the second aspect of the invention, a cam is provided with a mounting hole in which the swing pin slides up and down, a groove formed in the cam receiver, and a hole through which the lower shaft can pass. It is formed with a holding plate, and the swing pin is shorter than the depth of the mounting hole. Therefore, when the swing pin is descending, the needle plate is supported regardless of the position of the mounting hole that slides. The needle plate base can be set, and the movement locus of the feed dog becomes a semicircular locus. Further, since the needle plate base that supports the needle plate can be attached regardless of the position of the attachment hole in which the swing pin slides, the time for positioning and adjusting the needle plate base can be reduced.

According to a third aspect of the present invention, the mounting hole for the rocking pin to slide up and down is formed by a groove portion formed in the cam receiver and a cam holding plate provided with a hole portion through which the lower shaft can penetrate. Since the end face opposite to the outer peripheral face of the cam is brought into contact with the feed arm, the needle plate base that supports the needle plate is set regardless of the position of the mounting hole where the swing pin slides. You can
Moreover, since there is no opening in the upper part of the cam receiver that accommodates the eccentric cam, it is possible to prevent foreign matter from entering the inside of the cam receiver. Since the needle plate base that supports the needle plate can be attached regardless of the position of the attachment hole in which the swing pin slides, the time required for positioning and adjusting the needle plate base can be reduced.

According to a fourth aspect of the present invention, the mounting hole for the rocking pin to slide up and down is formed by a groove portion formed in the cam receiver and a cam holding plate provided with a hole portion through which the lower shaft can penetrate, and eccentricity is provided. Since the end face opposite to the outer peripheral face of the cam is brought into contact with the feed dog, the needle plate base that supports the needle plate is set regardless of the position of the mounting hole where the swing pin slides. can do. Moreover, since there is no opening in the upper part of the cam receiver that accommodates the eccentric cam, it is possible to prevent foreign matter from entering the inside of the cam receiver.

According to a fifth aspect of the present invention, at least a member for forming a mounting hole for accommodating the outer periphery of the vertically sliding rocking pin,
Since the cam receiver is formed as a protruding groove portion, and the mounting hole forming member is formed so as to protrude from the hole portion provided in the needle plate base supporting the needle plate with a predetermined gap, It is possible to reduce the amount of strain that the pressing force acts on the swing pin. Particularly, by inserting the needle plate base that supports the needle plate on the upper surface of the tip flat surface of the sewing machine bed machine frame that is provided so as to project above both sides of the cam receiver attached to the sewing machine bed machine frame, Since the distance between the needle plate base fulcrums is shortened and the strain generated in the needle plate base is reduced, the quality of the sewn product is improved.
Further, since the mounting hole in which the rocking pin slides is not affected by the pressure generated during sewing, the rocking pin can move normally and a smooth cloth feeding motion can be generated.

[Brief description of drawings]

FIG. 1 is a plan view of a main part showing a feed motion generating mechanism of a sewing machine, which corresponds to a front end portion of a sewing machine bed as seen from an arrow A in FIG. 10 in a feed motion generating mechanism of a sewing machine according to a first embodiment of the present invention. is there.

FIG. 2 is an exploded perspective view of main components of a feed motion generating mechanism of the sewing machine according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along line YY in FIG. 1 at the time of cloth feed forward movement, which illustrates the positional relationship between the needle plate and the feed dog.

FIG. 4 is a cross-sectional view taken along line YY in FIG. 1 at the time of cloth feed backward movement illustrating the positional relationship between the needle plate and the feed dog.

FIG. 5 is an explanatory diagram of a feed motion generating mechanism of the sewing machine according to the second embodiment of the present invention.

FIG. 6 is a sectional view taken along line YY in FIG. 1 at the time of cloth feed backward movement illustrating the positional relationship between the needle plate and the feed dog in the feed motion generating mechanism of the sewing machine according to the third embodiment of the present invention. FIG.

FIG. 7 is a sectional view taken along line YY in FIG. 1 at the time of cloth feed forward movement illustrating the positional relationship between the needle plate and the feed dog in the feed motion generating mechanism of the sewing machine according to the fourth embodiment of the present invention. FIG.

FIG. 8 is a sectional view taken along line YY in FIG. 1 at the time of cloth feed forward movement illustrating the positional relationship between the needle plate and the feed dog in the feed motion generating mechanism of the sewing machine according to the fifth embodiment of the present invention. FIG.

FIG. 9 is an explanatory view of the front of the main part of the end of the tubular bed sewing machine showing the mounting state of the needle plate base in the feed motion generating mechanism of the sewing machine according to the sixth embodiment of the present invention.

FIG. 10 is a front view of a conventional tubular bed sewing machine.

11 is a plan view of relevant parts showing a mechanism for generating the feed motion of the sewing machine at the front end portion of the sewing machine bed as seen from the direction of arrow A in FIG.

12 is a cross-sectional view taken along line XX in FIG. 11 showing the positional relationship between the needle plate and the feed dog.

13 is a vertical cross-sectional view of main constituent elements of the feed motion generating mechanism of the sewing machine in FIG.

14 is an exploded perspective view of main components of the feed motion generating mechanism of the sewing machine in FIG. 11. FIG.

FIG. 15 is an explanatory view of the front of the main part of the tip end portion of the tubular bed sewing machine showing the state of attachment of the conventional needle plate base.

[Explanation of symbols]

 2 Sewing machine frame 4 Needle plate base 4a Hole 4b Mounting hole 5 Needle plate 6 Feed dog 7 Feed arm 9 Swing pin 9a Rectangular swing pin 9b Swing pin 11 with sloping surface at top end 11 Eccentric cam 11a Gear Part 12 Cam receiver 12a Support part 12b Groove part 13 Cam retainer plate 13a Guide part 14 Lower shaft 14a Gear part 15 Mounting hole 26 Movement path of feed dog

[Procedure amendment]

[Submission date] September 27, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

According to a second aspect of the present invention, the mounting hole through which the swing pin slides up and down is formed by the groove portion formed in the cam receiver and the cam holding plate provided with the hole portion through which the lower shaft can penetrate. Since the oscillating pin is short with respect to the depth of the mounting hole, mounting that slides
Set the needle plate base that supports the needle plate regardless of the position of the hole
be able to. Further, the locus of movement of the feed dog becomes a semicircular locus.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

According to a fourth aspect of the present invention, the mounting hole for the rocking pin to slide up and down is formed by a groove portion formed in the cam receiver and a cam holding plate provided with a hole portion through which the lower shaft can penetrate. Since the end face opposite to the outer peripheral surface of the cam is brought into contact with the feed dog, the upper end of the cam receiver that accommodates the eccentric cam
Prevents foreign substances from entering the inside of the cam receiver because there is no opening
it can. Also, by simply removing the feed dog, the swing pin can be easily
Can be exchanged.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Further, a hook cover 19 for covering the hook body 17 and the like.
The needle plate base 4 that supports the opening of the
The support portion 12a and the guide portion 13a are provided in the provided hole portion 4a.
It is inserted so that it does not touch. Further, the needle plate base 4 is
The needle plate 5 fixed by the screws 1 is supported, and fixed to the sewing machine bed machine frame 2 by the screws 3. And washer 20
Is interposed between the presser lid 16 and the cam presser plate 13, and the hook body 17
It prevents the thread scraps and other foreign matter from entering the vicinity of the eccentric cam 11 from the direction. A hook 17 provided on the presser lid 16
In the hole 16a having a larger diameter than the mounting portion 17a of
By arranging the mounting portion 17a of the above, the shuttle body 17 is brought closer to the bearing portion 2b, and whirling of the shuttle body 17 attached to the tip of the lower shaft 14 is prevented.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

<Embodiment 2> Next, a flat bed type feed motion generating mechanism shown in FIG. 5 will be described. FIG. 5 is an explanatory view of the feed motion generating mechanism of the sewing machine according to the second embodiment of the present invention. In FIG. 5, 23 is a feed base that moves up and down by a swing pin 9 that is driven by the eccentric cam 11, 24 is a bearing that can move in the vertical direction, and 25 is an urging body including a spring or the like. Here, the feed dog 6 is fixed by a screw 8 to a feed base 23 which is supported by a bearing 24 so as to be vertically movable. The upper end of the rocking pin 9 that slides in the mounting hole 15 and follows the eccentric cam 11 comes into contact with the feed dog 6 attached to the feed base 23 that is urged downward by the urging body 25 to move up and down. Give. Then, the bearing 24 and the biasing body 25
In cooperation with the horizontal moving means including the above, it protrudes from the upper surface of the needle plate 5.
The feed dog 6 is moving horizontally and vertically.
And generate an elliptical movement of cloth feed.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

As described above, in this embodiment, the gear portion 14a is provided in the vicinity of the end portion, and the lower shaft 14 that transmits the driving energy for feeding the cloth and the gear portion 11a that meshes with the gear portion 14a of the lower shaft 14 are provided. An eccentric cam 11 formed on the inner peripheral surface thereof, a cam receiver 12 rotatably accommodating the eccentric cam 11, a swing pin abutting on the outer peripheral surface of the eccentric cam 11 and driven by the outer peripheral surface of the eccentric cam 11. In the feed motion generating mechanism of the sewing machine including 9 and 9, the mounting hole 15 through which the swing pin 9 slides vertically is
A groove 12b formed in the cam receiver 12 and a cam pressing plate 13 having a hole 13b through which the lower shaft 14 can penetrate are formed, and the opposite end surface of the eccentric cam 11 which is in contact with the outer peripheral surface is fed.
It is to be brought into contact with the helical teeth 6 , and corresponds to the embodiment described in claim 4 .

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

Therefore, since the needle plate base 4 supporting the needle plate 5 is fixed to the sewing machine bed machine frame 2, there is no vibration or impact due to the penetrating force generated when the needle penetrates the sewn product. , Which is transmitted to the machine bed frame 2 which is a rigid body,
Since there is a boundary surface between the sewing machine bed machine frame 2 and the cam receiver 12, it is formed by the groove portion 12 b provided on the cam receiver 12 inserted into the sewing machine bed machine frame 2 and the cam holding plate 13. The mounting hole 15 can avoid the above-mentioned vibration and impact. That is, since the swing pin 9 can move stably in the mounting hole 15, accurate and smooth cloth feeding movement can be performed. In addition, the cam receiver 12 that houses the eccentric cam 11
Since there is no opening at the top, foreign matter will not get inside the cam receiver 12.
Prevents the situation where the eccentric cam 11 locks after entering
It is possible and reliability is improved. Particularly, in this embodiment, the screw 8
The swing pin 9 can be easily replaced by simply removing the feed dog 6.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction content]

<Embodiment 6> Next, the structure of the tip portion of the tubular bed sewing machine shown in FIG. 9 will be described. FIG. 9 is an explanatory view of the front of the main part of the leading end of the tubular bed sewing machine showing the state of attachment of the needle plate base in the feed motion generating mechanism of the sewing machine according to the sixth embodiment of the present invention. In the figure, the pressure P generated by sewing
The needle plate base 4 that supports the needle plate 5 that receives the needle plate 5 is inserted into the upper surface of the protruding portion 2a of the sewing machine bed machine frame 2 that is provided so as to project above both sides of the cam receiver 12 that is attached to the sewing machine bed machine frame 2 . . Further, the needle plate base 4 has a support portion 1 for the cam receiver 12 which forms a mounting hole 15 in which the swing pin 9 is slidably supported.
2a and the guide portion 13a of the cam holding plate 13 form a gap, and have a hole portion 4a provided so as not to contact with each other.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction content]

In the feed motion generating mechanism of the sewing machine according to the second aspect of the invention, a cam is provided with a mounting hole in which the swing pin slides up and down, a groove formed in the cam receiver, and a hole through which the lower shaft can pass. Since it is formed with a holding plate, and the swing pin is short with respect to the depth of the mounting hole, it does not depend on the position of the mounting hole where the swing pin slides.
Needle plate that supports the needle plate can be attached to the engagement
Therefore, the time for adjusting the positioning of the throat plate base can be reduced. Well
Also, since the downward movement of the feed dog is restricted,
The movement locus becomes a semicircular locus.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0045

[Correction method] Change

[Correction content]

According to a fourth aspect of the present invention, the mounting hole for the rocking pin to slide up and down is formed by a groove portion formed in the cam receiver and a cam holding plate provided with a hole portion through which the lower shaft can penetrate, and eccentricity is provided. Since the end face opposite to the outer peripheral surface of the cam is brought into contact with the feed dog, the upper end of the cam receiver that accommodates the eccentric cam
Prevents foreign substances from entering the inside of the cam receiver because there is no opening
it can. Also, by simply removing the feed dog, the swing pin can be easily
Can be exchanged.

Claims (5)

[Claims] 1. A lower shaft which is provided with a gear portion near an end thereof and transmits drive energy for feeding cloth, and an eccentric cam having a gear portion meshing with the gear portion of the lower shaft formed on an inner peripheral surface thereof. A feed motion generating mechanism of a sewing machine, comprising: a cam receiver that rotatably accommodates the eccentric cam; and a swing pin that is in contact with an outer peripheral surface of the eccentric cam and that follows an outer peripheral surface of the eccentric cam. A feed motion generating mechanism for a sewing machine, characterized in that a mounting hole through which the moving pin slides up and down is formed by a groove formed in the cam receiver and a cam holding plate provided with a hole through which the lower shaft can penetrate. . 2. A lower shaft which is provided with a gear portion near the end thereof and which transmits drive energy for feeding cloth, and an eccentric cam having a gear portion which meshes with the gear portion of the lower shaft formed on an inner peripheral surface, A feed motion generating mechanism of a sewing machine, comprising: a cam receiver that rotatably accommodates the eccentric cam; and a swing pin that is in contact with an outer peripheral surface of the eccentric cam and that follows an outer peripheral surface of the eccentric cam. The mounting hole through which the moving pin slides vertically is formed by a groove formed in the cam receiver and a cam holding plate provided with a hole through which the lower shaft can penetrate. A mechanism for generating a feed motion of a sewing machine, which is characterized in that it is formed so as to be shorter than the depth. 3. A lower shaft which is provided with a gear portion near an end thereof and which transmits drive energy for feeding cloth, and an eccentric cam having a gear portion which meshes with the gear portion of the lower shaft formed on an inner peripheral surface, A feed motion generating mechanism of a sewing machine, comprising: a cam receiver that rotatably accommodates the eccentric cam; and a swing pin that is in contact with an outer peripheral surface of the eccentric cam and that follows an outer peripheral surface of the eccentric cam. The mounting hole through which the moving pin slides up and down is formed by a groove formed in the cam receiver and a cam holding plate provided with a hole through which the lower shaft can penetrate, and is abutted on the outer peripheral surface of the eccentric cam. A feed motion generating mechanism of a sewing machine, characterized in that the opposite end face is brought into contact with the feed arm. 4. A lower shaft which is provided with a gear portion near the end and which transmits drive energy for feeding cloth, and an eccentric cam having a gear portion meshing with the gear portion of the lower shaft formed on the inner peripheral surface, A feed motion generating mechanism of a sewing machine, comprising: a cam receiver that rotatably accommodates the eccentric cam; and a swing pin that is in contact with an outer peripheral surface of the eccentric cam and that follows an outer peripheral surface of the eccentric cam. The mounting hole through which the moving pin slides up and down is formed by a groove formed in the cam receiver and a cam holding plate provided with a hole through which the lower shaft can penetrate, and is abutted on the outer peripheral surface of the eccentric cam. A feed motion generating mechanism of a sewing machine, characterized in that the opposite end face is brought into contact with the feed dog. 5. A lower shaft which is provided with a gear portion near an end thereof and which transmits drive energy for feeding cloth, and an eccentric cam having a gear portion which meshes with the gear portion of the lower shaft formed on an inner peripheral surface, A feed motion generating mechanism of a sewing machine, comprising: a cam receiver that rotatably accommodates the eccentric cam; and a swing pin that is in contact with an outer peripheral surface of the eccentric cam and that follows an outer peripheral surface of the eccentric cam. The member for forming the mounting hole for accommodating the outer periphery of the movable swing pin is at least a groove portion projecting the cam receiver, and the member for forming the mounting hole is provided on the needle plate base for supporting the needle plate. A mechanism for generating a feed motion of a sewing machine, characterized in that it is formed so as to project from a hole having a predetermined gap.