JP2959338B2 - Feeding motion generation mechanism of sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 10 to FIG.
BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 10 is a front view of a conventional tubular bed sewing machine, in which the leading end of the sewing machine bed is located above the sewing machine table surface. FIG. 11 is a plan view of a main part showing a mechanism for generating a feed movement of the sewing machine at the leading end portion of the sewing machine bed as viewed from an arrow A in FIG. 10, and FIG. 12 is a view showing a positional relationship between the needle plate 5 and the feed dog 6. It is XX sectional drawing. FIG. 13 is a longitudinal sectional view of the main components of the feed motion generating mechanism of the sewing machine in FIG. 11, and FIG. 14 is an exploded perspective view of the main components of the feed motion generating mechanism of the sewing machine in FIG.

[0003] In the drawing, reference numeral 2 denotes a cylindrical sewing machine bed frame attached to the lower portion of the sewing machine main body 2A. Reference numeral 7 denotes a feed arm pivotally supported at one end (right end in the drawing) of the sewing machine bed machine frame 2. 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 denotes a needle plate base, reference numeral 5 denotes a needle plate, and reference numeral 9c denotes a swing pin inserted into a mounting hole 4b provided in the needle plate base 4 for supporting the needle plate 5, and an upper end of the swing pin 9c is a feed pin. The lower end of the pivot pin 9c contacts the outer peripheral surface of the eccentric cam 11 while the lower end of the arm 7 is in contact with the lower surface of the distal end. The pivot pin 9c reciprocates in the up-down direction by the rotation of the eccentric cam 11, and the tip end of the feed arm 7 also reciprocates in the up-down direction by following the swing pin 9c. Reciprocate up and down.

A lower shaft 14 drives the eccentric cam 11, a hook body (not shown), and the like.
4a is a gear portion 11 provided on the inner peripheral surface of the eccentric cam 11.
The eccentric cam 11 is rotated while meshing with a. Reference numeral 12c denotes a cam receiver attached to the sewing 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 presser plate, 20 is thread scraps and other foreign matter from the direction of the shuttle,
This is a washer for preventing the eccentric cam 11 from entering the periphery thereof, and is interposed between the holding lid 16 and the cam holding plate 13.
Reference numeral 18 denotes a horizontal feed shaft for reciprocating the feed dog 6 in the horizontal direction via the connecting means 10, and the feed dog 6 is moved in an elliptical manner by the horizontal movement and the above-described vertical reciprocation. The feed of cloth or the like is performed by performing four feed motions.

On the other hand, FIG. 15 is an explanatory front view of a main part of a tip portion of a cylindrical bed sewing machine showing a state in which a conventional needle plate base 4 is attached. The needle plate base 4 has a mounting hole 4 for inserting and supporting the swing pin 9c.
At a position rearward of the position b (right side in FIG. 15), it is attached to the upper surface of the distal end of the cylindrical sewing machine bed frame 2 and projects in a cantilever manner beyond the cam receiver 12c, the cam holding plate 13, and the like. The arm plate 5 supports the needle plate 5 which receives a pressure P generated by sewing.

[0006]

In the above-described conventional feeder motion generating mechanism of the sewing machine, in order to obtain a smooth cloth feed elliptical motion, the mounting hole 4b in which the swing pin 9c is inserted and supported is formed by the eccentric cam 11. Needs to be arranged just above the center of rotation of.
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 maintain the position in relation to the positions of the feed dog 6 and the needle drop. become. Since the upper portion of the cam receiver 12c for accommodating the eccentric cam 11 is open, there is a possibility that a foreign substance may enter when the needle plate base 4 is attached or disassembled, and the eccentric cam 11 may be locked. Therefore, special consideration is required for these operations.

[0007] Therefore, the present invention is an object to provide a set elevational adjustment and feed motion generating mechanism of the sewing machine which does not require special consideration to its workability.

[0008]

According to a first aspect of the present invention, there is provided a mechanism for generating a feed motion of a sewing machine, wherein a cam receiver has an upper portion protruding.
And a support portion having a groove in which a part of the swing pin slides.
The cam holding plate closes the groove of the support part of the cam receiver
A guide section is provided, and a support section for the cam receiver and a guide section for the cam holding plate
At the same time, a mounting hole is formed to slide the swing pin up and down.
The needle plate supports the support for the cam receiver and the guide for the cam holding plate.
And a hole for allowing the part to be loosely inserted.

[0009]

According to the first aspect, the support portion of the cam receiver and the cam are provided.
Mounting that slides the swing pin up and down together with the guide of the presser plate.
A hole is formed, and the needle plate support has a cam receiving support and a cam.
A hole is provided to allow the guide part of the holding plate to be loosely inserted.
Irrespective of the position of the mounting hole in which the swing pin slides,
A throat table supporting the plate can be set. In addition,
Because there is no opening at the top of the cam receiver that houses the core cam,
Foreign matter can be prevented from entering the inside of the cam receiver.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sewing machine according to an embodiment of the present invention; In the figure,
The same reference numerals and symbols as those of the conventional example indicate the same or corresponding components as those of the conventional example.

Embodiment 1 FIG. 1 is a view showing a mechanism for generating a feed motion of a sewing machine corresponding to a front end portion of a sewing machine bed viewed from an arrow A in FIG. 10 in the feed motion generating mechanism of the sewing machine according to a first embodiment of the present invention. 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 the line YY in FIG. 1 at the time of cloth feed movement illustrating the positional relationship between the needle plate 5 and the feed dog 6, and FIG.
In FIG. 1 at the time of the cloth feed backward movement
FIG. 3 is a sectional view taken along line Y. 1 and 2, reference numeral 9 denotes a swinging pin formed of a substantially rectangular parallelepiped; 12, a cam receiver having a protruding support portion 12 a and a groove 12 b formed therein and in contact with three surfaces of the swinging pin 9; A cam holding plate provided with a guide portion 13a for closing the groove portion 12b and a hole portion 13b through which the lower shaft 14 can pass. The swing pin 9 is provided with a screw 22
Cam receiver 1 fixed to the machine bed machine frame 2 from the side
A groove 12b provided in the second support portion 12a and the holding lid 1
6. It is vertically slidably inserted into a mounting hole 15 formed by a guide portion 13a of a cam holding plate 13 which is attached to the cam receiver 12 by a screw 21 together with a washer 20.

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

Referring to FIGS. 3 and 4, a description will be given of the semi-circular movement trajectory of the feed dog 6 in the cylindrical bed sewing machine. FIG. 3 shows the state of the cloth feed at the time of forward movement.
Is a groove 12 provided in the support portion 12a of the cam receiver 12.
b and the guide portion 13a of the cam holding plate 13 so as to be vertically slidably inserted into the mounting hole 15. The upper end is in contact with the lower surface of the feed arm 7, and the lower end is in contact with the outer peripheral surface of the eccentric cam 11. ing. At this time, the feed dog 6 protruding from the upper surface of the needle plate 5 is caused by the horizontal movement and the above-described vertical reciprocation by the horizontal feed shaft 18 which gives reciprocation in the horizontal direction via the connecting means 10 shown in FIG. Then, the sewing product (not shown) is moved forward (to the left in the figure). This state corresponds to a curved section of the movement trajectory 26 of the feed dog 6.

FIG. 4 shows a state at the time of the backward movement of the cloth feeding, in which the upper end of the support portion 12a and the lower surface of the feeding arm 7 are in contact. At this time, the tooth portion of the feed dog 6 is located below the upper surface of the needle plate 5, and moves backward (to the right in the figure) without affecting a sewing product (not shown). This is the motion trajectory 2 of the feed dog 6
6 corresponds to the straight section.

As described above, the present embodiment supports the needle plate 5 which receives a penetrating force or the like generated when the needle penetrates the sewing product,
A needle plate base 4 attached to the sewing machine bed frame 2, a gear portion 14a provided near an end portion, meshes with a lower shaft 14 that transmits driving energy for performing cloth feeding, and a gear portion 14a of the lower shaft 14. Eccentric cam 11 having gear 11a formed on the inner peripheral surface
A cam receiver 12 rotatably accommodated in the machine bed 2 and an oscillating pin abutting on the outer peripheral surface of the eccentric cam 11 and driven by the outer peripheral surface of the eccentric cam 11. 9, a feed dog 6 moved up and down by the swing pin 9
In the feed motion generating mechanism of the sewing machine having the feed arm 7 provided with the tooth portion at the end, the mounting hole 15 in which the swing pin 9 slides up and down is provided with a groove 12b formed in the cam receiver 12,
Cam holding plate 1 provided with hole 13b through which lower shaft 14 can pass
3 and a mounting hole 15 formed by a groove 12b provided in the cam receiver 12 and the cam holding plate 13.
Is isolated from the needle plate base 4 that supports the needle plate 5 that receives a penetrating force or the like generated when the needle penetrates the sewn product, and is not directly subjected to vibration, impact, or the like due to the penetrating force. Moving pin 9
Can move the mounting hole 15 stably .

Accordingly, the mounting hole 15 formed by the groove 12b provided in the cam receiver 12 mounted on the sewing machine frame 2 and the cam holding plate 13 is formed by a through hole generated when the needle passes through the sewing product. The swing 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 or the like, and is not directly subjected to vibration, impact, or the like due to the penetrating force or the like. Up and down movement can be performed. Also,
Since the needle plate base 4 supporting the needle plate 5 is fixed to the sewing machine frame 2, vibrations and impacts caused by a penetrating force or the like generated when the needle penetrates the sewing product are rigid sewing machines. 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 12 b provided in the cam receiver 12 inserted into the machine bed machine frame 2 is provided. The mounting hole 15 formed by the
The above-described vibration and impact can be avoided. That is, since the swing pin 9 can stably move in the mounting hole 15, an accurate and smooth cloth feeding movement can be performed. In the present embodiment, the motion trajectory of the semicircular feed dog has been described. However, since the height of the support portion 12a can be arbitrarily determined, not only the motion trajectory of the semicircular feed dog but also the entire ellipse is used. It is also possible to create a motion trajectory of the feed dog.

The present embodiment supports a needle plate 5 which receives a penetrating force or the like generated when a needle penetrates a sewn product, a needle plate base 4 attached to the sewing machine frame 2, and an end portion. A gear 14a is provided in the vicinity, and a lower shaft 14 that transmits driving energy for feeding the cloth, an eccentric cam 11 having a gear 11a meshed with the gear 14a of the lower shaft 14 formed on an inner peripheral surface, and an eccentric cam The eccentric cam 11 includes a cam receiver 12 rotatably accommodated therein and mounted on the sewing machine frame 2, and a swing pin 9 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 mounting hole 15 in which the swing pin 9 slides up and down includes a groove 12b formed in the cam receiver 12, and a hole 13b through which the lower shaft 14 can pass.
The swing pin 9 is formed shorter with respect to the depth of the mounting hole 15, and the swing pin 9 is formed shorter with respect to the depth of the mounting hole 15. From
When the swing pin 9 is lowered, the needle plate base 4 that supports the needle plate 5 can be set regardless of the position of the mounting hole 15 that slides . Therefore, the elliptical motion trajectory is drawn when the feed dog 6 moves in the forward direction, and the linear motion is performed when the feed dog 6 moves in the backward direction. Therefore, it is possible to perform the proper cloth feeding motion without descending more than necessary. Further, since the friction time between the swing pin 9 and the feed arm 7 is reduced, the frictional state is improved, and the durability of the constituent members is improved.

Embodiment 2 Next, a flat bed type feeding motion generating mechanism shown in FIG. 5 will be described. FIG. 5 is an explanatory view of a mechanism for generating a feeding motion of the sewing machine according to the second embodiment of the present invention. In FIG. 5, 23
The reference numeral 24 designates a feed bar which moves up and down by a swing pin 9 which is driven by the eccentric cam 11, 24 denotes a bearing which can move in the vertical direction, and 25 denotes a biasing member made of a spring or the like. Here, the feed dog 6 is fixed with a screw 8 to a feed base 23 supported on a bearing 24 so as to be movable in the vertical direction. The upper end of the swinging pin 9 that slides in the mounting hole 15 and follows the eccentric cam 11 abuts on the feed dog 6 attached to the feed base 23 urged downward by the urging body 25, and moves up and down. Give. Then, a horizontal feed shaft 18 that reciprocates in the horizontal direction via a connecting means 10 shown in FIG. 13 cooperates with a horizontal moving means including a bearing 24 and an urging body 25 to move the needle plate 5 from the upper surface. The protruding feed dog 6 generates an elliptical motion of cloth feeding by the horizontal motion and the vertical reciprocating motion.

As described above, the present embodiment supports the needle plate 5 which receives a penetrating force or the like generated when the needle penetrates the sewing product,
A needle plate base 4 attached to the sewing machine bed frame 2, a gear portion 14a provided near an end portion, meshes with a lower shaft 14 that transmits driving energy for performing cloth feeding, and a gear portion 14a of the lower shaft 14. Eccentric cam 11 having gear 11a formed on the inner peripheral surface
A cam receiver 12 rotatably accommodated in the machine bed 2 and an oscillating pin abutting on the outer peripheral surface of the eccentric cam 11 and driven by the outer peripheral surface of the eccentric cam 11. 9. A feeding motion generating mechanism for a sewing machine comprising:
The mounting hole 15 in which the swing pin 9 slides up and down is
The eccentric cam 1 is formed by a groove 12b formed in the eccentric cam 1 and a cam holding plate 13 provided with a hole 13b through which the lower shaft 14 can pass.
The other end surface of the arm 1 is brought into contact with the feed dog 6 of the feed arm 7 and supports the needle plate 5 irrespective of the position of the mounting hole 15 in which the swing pin 9 slides. In addition, since there is no opening above the cam receiver 12 that accommodates the eccentric cam 11, it is possible to prevent foreign matter from entering the inside of the cam receiver 12 .

Therefore, since the needle plate base 4 supporting the needle plate 5 is fixed to the sewing machine bed frame 2, vibrations and impacts caused by a penetrating force or the like generated when the needle penetrates the sewing product are not affected. Is transmitted to the rigid sewing machine bed frame 2,
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 12b provided in 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-described vibration and impact. That is, since the swing pin 9 can stably move in the mounting hole 15, an accurate and smooth cloth feeding movement can be performed. Further, the needle plate base 4 that supports the needle plate 5 can be mounted regardless of the position of the mounting hole 15 in which the swing pin 9 slides, so that 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 at the upper part of the eccentric cam 11, it is possible to prevent a situation in which a foreign substance enters the inside of the cam receiver 12 and the eccentric cam 11 is locked, thereby improving reliability. In particular, in the present embodiment, the swing pin 9 can be easily replaced simply by removing the screw 8 and the feed dog 6.

<Embodiment 3> Next, a feed motion generating mechanism of the cylindrical bed sewing machine shown in FIG. 6 will be described. FIG. 6 is a cross-sectional view corresponding to a cross section taken along line YY in FIG. 1 at the time of cloth feed reversing 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. . In the figure, a swing pin 9 a that slides up and down the mounting hole 15 is formed in a rectangular shape that is wider than the feed arm 7 to which the feed dog 6 is mounted and is long along the tangential direction of the eccentric cam 11. The upper end of the swing pin 9 a 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, the present embodiment supports the needle plate 5 which receives a penetrating force or the like generated when the needle penetrates the sewing product,
A needle plate base 4 attached to the sewing machine bed frame 2, a gear portion 14a provided near an end portion, meshes with a lower shaft 14 that transmits driving energy for performing cloth feeding, and a gear portion 14a of the lower shaft 14. Eccentric cam 11 having gear 11a formed on the inner peripheral surface
A cam receiver 12 rotatably accommodated in the machine bed 2 and an oscillating 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, the mounting hole 15 in which the swing pin 9a slides up and down is provided with a groove 12b formed in the cam receiver 12 and a hole 13b through which the lower shaft 14 can pass. And the opposite end surface of the eccentric cam 11 which is in contact with the outer peripheral surface of the eccentric cam 11 is brought into contact with the lower surface of the feed arm 7. Needle plate base 4 supporting needle plate 5 irrespective of position
Since there is no opening at the top of the cam receiver 12 that accommodates the eccentric cam 11, the cam receiver 12
Foreign matter can be prevented from entering the inside .

In particular, in this embodiment, when the feed arm 7 moves in the horizontal direction, the feed arm 7 is prevented from falling around the swing pin 9a, so that the cloth feed motion is stabilized. In addition, the feed arm 7
The contact area between the lower surface of the oscillating pin 9a and the swing pin 9a can be increased, the frictional state can be reduced, and the progress of wear can be suppressed. The rectangular swinging pin 9a along the tangential direction of the eccentric cam 11 is displaced from the center of rotation of the eccentric cam 11 within the 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 in which the swing pin 9a slides with respect to the rotation center of the eccentric cam 11 is located. Accuracy can be reduced. Also, for example, the feed dog 6
When the lower surface of the feed arm 7 to which is attached is in contact with the upper end of the swing pin 9a, since the swing pin 9a is elongated in the horizontal direction of the cloth feed elliptical motion, the feed arm around the swing pin 9a 7 can be prevented, the horizontal movement of the feeding is stabilized, and an accurate cloth feeding elliptical movement can be generated.

Embodiment 4 Next, a feed motion generating mechanism of the cylindrical bed sewing machine shown in FIG. 7 will be described. FIG. 7 is a cross-sectional view corresponding to the cross section taken along line YY in FIG. 1 at the time of cloth feed 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. . The upper surface of the swing pin 9b formed in a rectangular shape along the tangential direction of the eccentric cam 11 is inclined to the lower right in the figure. Further, the lower end of the swing pin 9b contacts the outer peripheral surface of the eccentric cam 11, the upper end thereof contacts the lower surface of the feed arm 7, and the feed arm 7 is inclined along the slope of the upper surface of the swing pin 9b.

As described above, the present embodiment supports the needle plate 5 which receives a penetrating force or the like generated when the needle penetrates the sewing product,
A needle plate base 4 attached to the sewing machine bed frame 2, a gear portion 14a provided near an end portion, meshes with a lower shaft 14 that transmits driving energy for performing cloth feeding, and a gear portion 14a of the lower shaft 14. Eccentric cam 11 having gear 11a formed on the inner peripheral surface
A cam receiver 12 rotatably accommodated in the machine bed 2 and an oscillating 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, the mounting hole 15 in which the swing pin 9b slides up and down is provided with a groove 12b formed in the cam receiver 12 and a hole 13b through which the lower shaft 14 can pass. And the opposite end surface of the eccentric cam 11 which is in contact with the outer peripheral surface of the eccentric cam 11 is brought into contact with the lower surface of the feed arm 7. Needle plate base 4 supporting needle plate 5 irrespective of position
Since there is no opening at the top of the cam receiver 12 that accommodates the eccentric cam 11, the cam receiver 12
Foreign matter can be prevented from entering the inside . In particular, the feed dog 6
In a so-called forward rising state, the cloth feed motion is performed as shown by the motion locus 26 of the feed dog. In the present embodiment, the movement trajectory 26 of the feed dog is semicircular, but in the case of practicing the present invention, the height of the support portion 12a constituting the mounting hole 15 can be determined arbitrarily. In addition to the motion trajectory of the semicircular feed dog, it is also possible to create the motion trajectory of the fully elliptical feed dog.

Fifth Embodiment Next, a description will be given of a feed motion generating mechanism of the cylindrical bed sewing machine shown in FIG. FIG. 8 is a cross-sectional view corresponding to the cross section taken along line YY in FIG. 1 at the time of cloth feed 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. . As shown in FIG. 8, the swing pin 9 sliding in the mounting hole 15 is provided with a hole 4 a provided in the needle plate base 4.
, The supporting portion 12a of the cam receiver 12 is inserted, the feed arm 7 is disposed above the support portion 12a, and the hole 7a formed in the feed arm 7 is inserted through the support portion 12a to be attached to the feed arm 7. It is in contact with the feed dog 6 from below.

As described above, the present embodiment supports the needle plate 5 which receives a penetrating force or the like generated when the needle penetrates the sewing product,
A needle plate base 4 attached to the sewing machine bed frame 2, a gear portion 14a provided near an end portion, meshes with a lower shaft 14 that transmits driving energy for performing cloth feeding, and a gear portion 14a of the lower shaft 14. Eccentric cam 11 having gear 11a formed on the inner peripheral surface
A cam receiver 12 rotatably accommodated in the machine bed 2 and an oscillating pin abutting on the outer peripheral surface of the eccentric cam 11 and driven by the outer peripheral surface of the eccentric cam 11. 9. A feeding motion generating mechanism for a sewing machine comprising:
The mounting hole 15 in which the swing pin 9 slides up and down is
The eccentric cam 1 is formed by a groove 12b formed in the eccentric cam 1 and a cam holding plate 13 provided with a hole 13b through which the lower shaft 14 can pass.
1, the end face of which is in contact with the outer peripheral surface is brought into contact with the feed dog 6 of the feed arm 7, and the needle plate 5 is moved regardless of the position of the mounting hole 15 in which the swing pin 9 slides. The throat table 4 to be supported can be set. In addition, since there is no opening above the cam receiver 12 that accommodates the eccentric cam 11, the cam receiver 12
Foreign matter can be prevented from entering the inside .

Accordingly, since the needle plate base 4 supporting the needle plate 5 is fixed to the sewing machine bed frame 2, vibrations and impacts caused by a penetrating force or the like generated when the needle penetrates the sewing product are reduced. Is transmitted to the rigid sewing machine bed frame 2,
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 12b provided in 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-described vibration and impact. That is, since the swing pin 9 can stably move in the mounting hole 15, an accurate and smooth cloth feeding movement can be performed. In addition, the needle plate base 4 that supports the needle plate 5 can be attached irrespective of the position of the attachment hole 15 in which the swing pin 9 slides, so that 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 at the upper part of the eccentric cam 11, it is possible to prevent a situation in which a foreign substance enters the inside of the cam receiver 12 and the eccentric cam 11 is locked, thereby improving reliability. In particular, also in the present embodiment, the swing pin 9 can be easily replaced simply by removing the feed dog 6.

Embodiment 6 Next, a description will be given of a distal end structure of a cylindrical bed sewing machine shown in FIG. FIG. 9 is an explanatory front view of a main part of a distal end portion of a cylindrical bed sewing machine showing a state in which a needle plate is mounted in a feeding motion generating mechanism of a sewing machine according to another embodiment of the present invention. In the figure, a needle plate base 4 that supports a needle plate 5 that receives a pressure P generated by sewing is formed with a protrusion 12a that forms a groove 12b that protrudes upward from both sides of a cam receiver 12 attached to the sewing machine frame 2. To the upper surface of the needle plate base 4. 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. ,
It has a hole 4a provided so as not to contact.

As described above, the present embodiment supports the needle plate 5 which receives a penetrating force or the like generated when the needle penetrates the sewing product,
A needle plate base 4 attached to the sewing machine bed frame 2, a gear portion 14a provided near an end portion, meshes with a lower shaft 14 that transmits driving energy for performing cloth feeding, and a gear portion 14a of the lower shaft 14. Eccentric cam 11 having gear 11a formed on the inner peripheral surface
A cam receiver 12 rotatably accommodated in the machine bed 2 and an oscillating pin abutting on the outer peripheral surface of the eccentric cam 11 and driven by the outer peripheral surface of the eccentric cam 11. 9. A feeding motion generating mechanism for a sewing machine comprising:
Mounting hole 1 for accommodating the outer periphery of swing pin 9 that slides up and down
5, the cam receiver 12 is at least protruded into a support portion 12a, and the support portion 12a is provided with a groove 12
b, and the supporting portion 12a is formed so as to protrude with a predetermined gap from a hole provided in a needle plate support for supporting the needle plate, and a pressing force is applied to the swing pin 9. Can be reduced .

Therefore, since the needle plate base 4 supporting the needle plate 5 is fixed to the sewing machine frame 2, vibrations and shocks caused by a penetrating force or the like generated when the needle penetrates the sewing product are not affected. Is transmitted to the rigid sewing machine bed frame 2,
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 12b provided in 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-described vibration and impact. That is, since the mounting hole 15 is not affected by the pressure P, the swing pin 9 can move normally. In addition, since the distance between the point of application of the pressure P and the fulcrum support point C can be shortened, the distortion of the cantilever-shaped needle plate 4 due to the pressure P can be reduced. Since the swing pin 9 can stably move in the mounting hole 15, an accurate and smooth cloth feeding movement can be performed. Further, the needle plate base 4 that supports the needle plate 5 can be mounted regardless of the position of the mounting hole 15 in which the swing pin 9 slides, so that the time for adjusting the positioning of the needle plate base 4 can be reduced. Since there is no opening above the cam receiver 12 that accommodates the eccentric cam 11, it is possible to prevent a situation in which foreign matter enters the cam receiver 12 and the eccentric cam 11 is locked, thereby improving reliability.

[0032]

As it is evident from the foregoing description, according to the first aspect, mosquito
The upper part protrudes from the arm holder and a part of the swing pin
Is provided with a support portion having a groove in which the cam slides,
A guide section is provided to close the groove in the support section of the cam
Move the swing pin up and down together with the support section and the guide section of the cam
A sliding mounting hole is formed, and the needle plate
A hole is provided for loosely inserting the support section and the guide section of the cam holding plate.
Therefore, regardless of the position of the mounting hole in which the swing pin slides,
A needle plate base that supports the needle plate can be set, and
Because there is no opening at the top of the cam receiver that houses the core cam,
Foreign matter can be prevented from entering the inside of the cam receiver. And shaking
Supports the needle plate regardless of the position of the mounting hole in which the moving pin slides
The needle plate base can be attached.
The time for the placement adjustment can be reduced.

[Brief description of the drawings]

[1] Figure 1 is a fragmentary plan view showing a feeding motion generating mechanism of the sewing machine corresponding to arrow A as viewed from the bed front end portion of FIG. 10 in the feeding motion generating mechanism of the sewing machine of the real施例of the present invention .

Figure 2 is an exploded perspective view of the main components of a feed motion generating mechanism of the sewing machine of the real施例of the present invention.

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

FIG. 4 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.

Figure 5 is an explanatory view of a feed motion generating mechanism of the sewing machine of the real施例of the present invention.

Figure 6 corresponds to line Y-Y section in Figure 1 for cloth feed backward illustrating the positional relationship between the teeth and the feed throat plate in feed motion generating mechanism of the sewing machine of the real施例of the present invention cross FIG.

Figure 7 is a cross section corresponding to the line Y-Y section in Figure 1 for cloth feed forward illustrating the positional relationship between the teeth and the feed throat plate in feed motion generating mechanism of the sewing machine of the real施例of the present invention FIG.

Figure 8 corresponds to line Y-Y section in Figure 1 for cloth feed forward illustrating the positional relationship between the teeth and the feed throat plate in feed motion generating mechanism of the sewing machine of the real施例of the present invention cross FIG.

Figure 9 is an illustration of a partial front of the cylindrical bed sewing machine tip showing the needle plate stand mounted state in the feed motion generating mechanism of the sewing machine of the real施例of the present invention.

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

FIG. 11 is a plan view of a main part showing a mechanism for generating a feed movement of the sewing machine at the leading end portion of the sewing machine bed as viewed from an arrow A in FIG.

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

FIG. 13 is a longitudinal sectional view of main components of the feed motion generating mechanism of the sewing machine in FIG. 11;

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

FIG. 15 is an explanatory front view of a main part of a tip portion of a cylindrical bed sewing machine showing a state in which a conventional needle plate base is attached.

[Explanation of symbols]

2 Sewing bed machine frame, 4 needle plate, 4a hole, 4b
Mounting hole, 5 needle plate, 6 feed dog, 7 feed arm, 9 swing pin, 9a rectangular swing pin, 9b swing pin having an inclined surface at the upper end, 11 eccentric cam, 11a gear section, 12 cam receiver , 12a support portion, 12b groove portion, 13 cam holding plate, 13a guide portion, 14 lower shaft,
14a Gear part, 15 mounting hole, 26 Motion trajectory of feed dog.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-23168 (JP, A) JP-A-5-200179 (JP, A) JP-B-55-30394 (JP, B2) JP-B-2-2 40347 (JP, B2) JP-B-60-17555 (JP, B2) JP 1-35728 (JP, Y2) JP 2-14767 (JP, Y2) JP-B 34-12967 (JP, Y1) Patent 131164 (JP, C1) (58) Fields investigated (Int. Cl. ⁶ , DB name) D05B 27/00-27/ ²⁶

Claims (1)

(57) [Claims] A needle plate mounted on a frame of a sewing machine bed for supporting a needle plate which receives a penetrating force generated when a needle penetrates a sewing product; A lower shaft for transmitting drive energy for feeding, an eccentric cam having an inner peripheral surface formed with a gear portion that meshes with a gear portion of the lower shaft, and the eccentric cam is rotatably housed in a sewing machine frame. A cam receiver that is mounted and has a side part opened, a cam press plate that closes the side part of the cam receiver, and a swing that abuts on the outer peripheral surface of the eccentric cam and follows the outer peripheral surface of the eccentric cam. a pin, in the feed motion generating mechanism of the sewing machine comprising a feed arm provided at an end portion of the teeth of the feed tooth to be moved up and down by the pivot shaft, the receiving the cam, together with the protruded upper, said rocking Movement
A support portion having a groove in which a part of the pin slides is provided, and the cam holding plate closes the groove of the support portion of the cam receiver.
A guide portion is provided, and is shared with the support portion of the cam receiver and the guide portion of the cam holding plate.
A mounting hole for sliding the swing pin up and down.
The needle plate base includes a support portion for the cam receiver and a cam holding plate.
A feeding motion generating mechanism for a sewing machine , wherein a hole portion for loosely inserting the guide portion is provided .