JP3126329U - Clutch mechanism of sewing machine feed transmission device - Google Patents

Abstract

A clutch mechanism for a sewing machine transmission transmission device is provided.
A clutch mechanism of a kind of sewing machine transmission transmission device, which mainly includes an inner clutch disk and an outer clutch disk that move intermittently in a fixed direction to each other. Is realized. The inner clutch disk and the outer clutch disk act in combination with a ring-shaped friction surface and a friction disk provided on each of them, and the friction surface of the friction disk does not scratch when it is transmitted by compression of the entire ring surface. The friction disk is supported by a pressure-adjustable spring, and an axial thrust is generated in the linkage mechanism of the outer clutch disk by an accurate friction transmission power by the inner and outer clutch disks, and intermittently rotates in contact with the friction disk.
[Selection] Figure 1

Description

  The present invention relates to the design of a clutch mechanism for a kind of sewing machine transmission transmission device, and in particular, to the design of a clutch mechanism that realizes the function of feeding a needle and a workpiece by intermittently rotating the feeding shaft of a kind of sewing machine. .

  The principle of operation of the clutch mechanism of the feed transmission device in the conventional sewing machine is mainly that the clutch mechanism is fastened together with the side lid and the cover lid, and the side surface of the side lid is combined with the bottom of the linkage. Inside, a shaft collar and a clutch disk are sequentially provided, a disk pad is attached to the surface of the shaft collar, and an O-ring is provided between the side cover and the side cover. A cannula is protruded from the center of the tube, and the cannula is rotated with the lower feed shaft and enters the pipe pillar of the clutch disc. The clutch disk is attached to the inner surface of the cover lid, and a pipe pillar is provided in front of the clutch disk by a molding method. The tube pillar is connected to the bottom rod of the straight bar after protruding the cover lid. In the clutch device combined with the above-described components, the side lid is connected to the linkage. The inside rotates with the lower feed shaft, and the clutch disk extends to the front side of the clutch device and is connected to the lever. By utilizing the swinging motion of the lever that extends the clutch disk in front of the clutch device, the shaft collar cannula is transmitted and rotated to the cannula (the cannula is pivoted to the lower feed shaft). The insertion rod is inserted into the support mass, and its power rotates in conjunction with the lower feed shaft. On the other hand, after pulling the insertion rod, after the connection of the limit ring is released, the lever presses only the pipe pillar at the front end of the clutch disk, and the clutch device changes to idle with respect to the sleeve of the shaft collar, and the power is Not transmitted to the lower feed shaft. The insertion rod of the clutch device is inserted and locked at an appropriate time according to the movement, so that the lower feed shaft is transmitted from the lever to rotate intermittently in the fixed direction, and is transmitted to the lower feed shaft to be sewn. To send.

  According to the above-mentioned components of the clutch device, the contact between the clutch disk and the cover lid is compression by the elastic force of the leaf spring provided on the shaft collar body. However, the shaft collar must overcome the flatness of the leaf spring when manufactured. If the flatness of the leaf spring is lacking, the circumferential pressure distribution will be out of balance, and the three-claw clutch disk and the cover lid will not be able to transmit correctly due to imbalance of the receiving force. In addition, if the length of the leaf spring is not accurate because the leaf spring has a high constant, the pressure after mounting tends to be too large or too small to be adjusted.

  On the other hand, since the contact between the clutch disk and the cover lid is a local surface contact by three claws, when the sewing machine is stopped for a long time, an indentation is formed on the contact surface of the surface portion of the three claws, which affects the flatness of the operation surface. In addition, when the insertion rod and the support mass move in the axial direction according to the shaft collar, a radial component force is simultaneously generated on the feed shaft. If it continues to operate for a long time, the shaft collar will have poor wear. In light of the above-mentioned drawbacks of the known art, the present inventor has devised the present invention as a result of making improvements by other manufacturing methods and actively repeating research and development.

  The inner clutch disc and outer clutch disc of the clutch mechanism act on the respective ring-shaped friction surfaces intermittently, and the action surface of the friction disc does not cause scratches in the crimping and transmission of the entire ring surface. A main object of the present invention is to provide a clutch mechanism for a kind of sewing machine feed transmission device that realizes feed of a needle and a material to be sewn by rotating in a constant direction.

  The friction disk is fitted with a compression spring at the rear of the mandrel, and an adjustment bolt is provided at the rear of the compression spring. By adjusting the compression distance of the compression spring with the adjustment bolt, the friction power between the friction disk and the inner clutch disc is adjusted. Then, it is a next object of the present invention to provide a clutch mechanism of a kind of sewing machine feed transmission device that realizes accurate transmission of intermittent operation of the clutch disc to the friction disk.

  The rear part of the outer clutch disk is pivoted through a linkage mechanism, and the linkage mechanism reciprocates by an eccentric wheel to generate axial thrust, and intermittent contact rotation between the outer clutch board and the friction disk is performed. It is a further object of the present invention to provide a kind of clutch mechanism for a machine feed transmission device that realizes the above.

The invention of claim 1 mainly comprises a friction disk, a transmission device, an inner clutch disk, an outer clutch disk, and a linkage mechanism.
The friction disk is provided with a shaft collar on the back surface of the disc body, and provided with a mounting groove facing the shaft collar. A first friction surface and a second friction surface are provided on the inner edge of the disc body, and the first friction surface and the first friction surface are provided. Two friction surfaces are coated with one layer of friction medium, the first friction surface is provided in the edge of the disc body perpendicular to the ring shape, and the second friction surface is provided adjacent to the radial direction of the inner ring of the first friction surface;
The drive device is a transmission device that transmits the rotational force amount of the friction disk to the feed shaft. The drive device is mainly composed of components such as a mandrel, two support protrusions, a compression spring, an adjustment bolt, and a mounting bolt. A hollow shaft body is provided, a male screw thread is provided at the end of the shaft tube, a tightening hole and a screw hole penetrating the mandrel are provided at predetermined positions of the tube body of the new shaft, and the mandrel is fixed by a fixing screw. Fasten to the feed shaft by tightening to the tightening hole.
The inner clutch panel is formed with a ring-shaped friction surface on the edge on one side of the disk body, combined with the friction surface and the second friction surface, provided with a mounting hole at an appropriate position on the edge of the disk body, and connected to the traction bar of the pendulum mechanism The inner clutch disc is fixed to the feed shaft in the axial direction by the back support ring and the mandrel limit ring.
The outer clutch panel is provided with a disk body to be combined with the first friction surface, the inner edge of the disk body is provided with a ring-shaped friction surface in the vertical direction, and a few through holes and one mounting hole are provided on the rear surface of the disk body. Connected by the traction bar of the mechanism, a shaft bar is provided by molding at the center of the board body, and prepared for turning and interlocking of the linkage mechanism,
The linkage mechanism is a mechanism that reciprocates by the power of the lower shaft of the sewing machine, and its working end and the shaft bar of the outer clutch disk are rotated and interlocked.
With the above-described components, the inner clutch disc is fixed to the feed shaft by the mandrel and the back support ring, and the friction disc, the compression spring, the adjusting bolt and the mounting bolt are sequentially inserted into the mandrel, and the second friction of the friction disc. By tightening the adjusting bolt and the mounting bolt to the compression spring after making contact with the surface and the inner clutch panel, the compression energy of the compression spring shaft acts on the friction disk, and the outer clutch disk rotates freely to the feed shaft, and the inner clutch disk The friction surface and the first friction surface of the friction disk are brought into contact with each other, whereby the thrust of the pendulum mechanism is transmitted to the friction disk in stages via the outer clutch disk and the inner clutch disk, and the feed shaft Is formed as a clutch mechanism of a kind of sewing machine transmission transmission device, which forms an intermittent constant direction rotation of the needle and realizes the feeding of the needle and the workpiece.
The invention according to claim 2 is characterized in that the second friction surface of the friction disk is provided with an annular cone, and the annular friction surface of the inner clutch disc is also provided with a cone, which acts in combination. The clutch mechanism of the machine feed transmission device.
According to a third aspect of the present invention, there is provided a clutch mechanism of a sewing machine feed transmission device according to the first aspect, wherein the friction disk is provided with a slight ventilation groove in the axial direction on the surface of the second friction surface.
The invention of claim 4 is characterized in that the friction disk is provided with a ventilation hole at a predetermined position of the disk body, a filter is provided inside the ventilation hole, and a dust-proof ring is inserted into each edge of the friction disk disk body. The clutch mechanism of the sewing machine feed transmission device according to Item 1.
The invention of claim 5 is such that the linkage mechanism comprises a mounting base, a crankshaft, an eccentric wheel, and a bifurcated lever, the mounting base is fastened to and supported by the base of the sewing machine, one end of the crankshaft is pivoted to the mounting base, and the like The end is provided for the rotation of the bifurcated laver, the eccentric wheel is connected to the lower shaft of the sewing machine by the socket, the bifurcated laver is interlocked by the socket connection of the eccentric ring, and the working end of the bifurcated laver is rotated to the interlocking ring. 2. The clutch mechanism for a sewing machine feed transmission device according to claim 1, wherein the linkage mechanism combined by elements pulls the outer clutch disc and reciprocates in the axial direction on the feed shaft.

  In the present invention, the clutch mechanism design of the machine feed transmission device is capable of accurately performing intermittent constant direction rotation of the feed shaft, and also has the effect of preventing the friction disk indentation and friction pressure imbalance phenomenon.

  As shown in FIGS. 1 to 3, the clutch mechanism of the sewing machine feed transmission device according to the present invention is mainly composed of components such as the friction disk 1, the transmission device 2, the inner clutch disc 3, the outer clutch disc 4, and the linkage mechanism 5. Constitute. Among them, the friction disk 1 is generally provided with a plate-shaped board body, a shaft collar 11 is provided on the back surface of the board body, a mounting groove 12 is provided facing the shaft collar 11, and a first friction surface is provided at the inner edge of the board body. 13 and a second friction surface 14 (FIG. 4) are provided. A layer of friction medium 15 is provided on the first friction surface 13 and the second friction surface 14, and the friction medium 15 is composed of a member having a high friction coefficient such as rubber or a cork stopper. The first friction surface 13 forms a ring shape and is provided on the outer edge of the board, and the second friction surface 14 forms a conical ring shape and is provided adjacent to the inner ring diameter of the first friction surface 13. In addition to the friction medium 15 attached to the surface, a slight ventilation groove 151 (FIG. 5) is provided to act in combination with the first friction surface 13 and the outer clutch disc 4, and the second friction surface 14 is the inner clutch disc 3. Acts in combination. A ventilation hole 16 is provided in a fixed place of the board, and a filter 17 is attached inside the ventilation hole 16.

  The transmission device 2 is a transmission device that transmits the power of the friction disk 1 to the feed shaft 6. It is mainly composed of components such as a mandrel 21, two support protrusions 22, a compression spring 23, an adjustment bolt 24, and a mounting bolt 25. The shaft 21 is provided with a hollow shaft body, a limiting ring 211 is provided at the tip of the shaft tube, a male thread 212 is provided at the end of the shaft tube, and the inner diameter of the shaft 21 and the shaft diameter of the feed shaft 6 are provided. Accordingly, the outer diameter of the mandrel 21 is matched with the inner diameter of the friction disk uniaxial collar 11. A tightening hole 213 that penetrates the mandrel 21 is provided at a fixed location in the mandrel 21 main body, and the mandrel 21 is fastened to the tightening hole 213 by a fixing screw 214 and fixed to the feed shaft 6.

  The inner clutch disc 3 is provided with a ring-shaped disc body, a conical friction surface 31 is provided at the edge of one end of the disc body, and the friction surface 31 and the second friction surface 14 are combined. A mounting hole 32 is provided at an appropriate location on the edge of the board and is connected by a pulling bar A of the pendulum mechanism. After the inner clutch disc 3 is inserted into the feed shaft 6, the back support wheel 33, together with the mandrel 21 limiting ring 211, fixes the inner clutch disc 3 in the axial position.

  The outer clutch disk 4 is provided with a cup-shaped disk body to be combined with the first friction surface 13, a friction surface 41 is provided in the vertical direction on the inner edge of the disk body, and a plurality of passage holes 42 and attachment holes 43 are formed on the rear surface of the disk body. By providing, the passage hole 42 is fastened to the inner clutch panel 3 through the traction bar A. The mounting hole 43 is connected by another traction bar B provided in the pendulum mechanism. A shaft rod 44 is provided at the center of the plate body, and the outer clutch disc 4 is freely inserted into the feed shaft 6 by the shaft rod 44, and a thrust bearing 45, an interlocking ring 46 and an engagement line 47 are provided on the shaft rod 44, The interlocking ring 46 rotates and interlocks with the linkage mechanism 5. The engagement line 47 restricts the axial movement of the interlocking ring 46 by the shaft bar 44.

  As shown in FIG. 7, the linkage mechanism 5 is a mechanism that reciprocates by the power of the lower shaft of the sewing machine. It is mainly composed of components such as a mounting base 51, a crankshaft 52, an eccentric wheel 53, and a bifurcated lever 54. One end of the crankshaft 52 that supports the mounting base 51 by fastening it to the base of the sewing machine is in axial contact with the mounting base 51, and the other end is in axial contact with the bifurcated laver 54. The eccentric 53 is attached to the socket on the lower shaft 7 (refer to FIG. 6) of the sewing machine. The bifurcated laver 54 is interlocked by connecting the eccentric ring 53 with the socket, and the working end of the bifurcated laver 54 is pivoted to the interlocking ring 46 to constitute the linkage mechanism 5. The lower shaft 7 rotates in conjunction with the eccentric wheel 53, and when the eccentric wheel 53 rotates, the outer clutch disk 4 is intermittently moved by reciprocating with the crankshaft 52 as a fulcrum by interlocking the bifurcated lever 54. The towing and feeding shaft 6 reciprocates in the axial direction.

  With the above-described components, the inner clutch disc 3 is fixed to the feed shaft 6 in the axial direction by the core shaft 21 and the back support ring 33, and the friction disk 1, the compression spring 23, the adjusting bolt 24, and the mounting bolt 25 are sequentially installed. The core shaft 21 is inserted, the second friction surface 14 of the friction disk 1 is brought into contact with the inner clutch disc 3, and the adjusting bolt 24 and the mounting bolt 25 are tightened and supported by the compression spring 23. The compression energy generated by the compression spring 23 acts on the friction disk 1, and the outer clutch disk 4 is freely connected to the feed shaft 6 and is put on the outer side of the inner clutch disk 3. Contact the friction surface 13. By linking the outer clutch disk 4 from the linkage mechanism 5 and reciprocatingly moving in the axial direction of the feed shaft 6 and compressing the friction disk 1, the friction disk 1 also reciprocally moves and compresses according to the outer clutch disk 4. The first friction surface 13 and the second friction surface 14 intermittently contact the outer clutch disc 4 and the inner clutch disc 3, and the traction bar A and the traction bar B gradually increase the thrust from the pendulum mechanism. Further, by transmitting to the friction disk 1 via the inner clutch disk 3 and rotating intermittently in a fixed direction to the feed shaft 6, the feed of the needle of the feed shaft 6 and the workpiece is realized.

  The friction disk 1 is embedded in the mounting groove 12 by supporting protrusions 22 provided on both sides of the center shaft 21 of the transmission device 2, and the friction disk 1 rotates in conjunction with the feed shaft 6. In the present invention, in order to prevent the influence of impurities such as dust by the movement of the friction disk 1, a dust-proof ring 10 is inserted into the edge of the disk body of the friction disk 1 and the edge of the disk body of the inner clutch disk 3. This prevents the operation of the mechanism from being affected by external dust. However, since the sealed space is formed by the two dust-proof rings 10 between the friction disk 1 and the inner clutch panel 3, when the friction disk 1 reciprocates on the shaft 21 and moves in the axial direction, A differential pressure may be formed by the partition. For this reason, in the present invention, a ventilation hole 16 is provided in a certain place of the friction disk board, and dust is prevented by a filter 17 incorporated in the ventilation hole 16, and a ventilation groove 151 is provided to influence the differential pressure. To prevent.

  Further, since the first friction surface 13 and the second friction surface 14 of the friction disk 1 are in contact with the inner clutch disk 3, the outer clutch disk 4, and the entire ring-shaped plane, the inner clutch disk 3 can be used when the sewing machine does not operate for a long period of time. Alternatively, since the outer clutch disk 4 is also in contact with the friction disk 1, neither the first friction surface 13 nor the second friction surface 14 leaves an edge impression. Even in the case of forced friction rotation until the sewing machine mechanism is calibrated, the inner clutch disk 3 and the outer clutch disk 4 are scratched by the friction medium 15 provided on the surface of the first friction surface 13 or the second friction surface 14. Leave no scars.

  In the compression spring 23, the friction disk 1 has an appropriate pressing force with respect to the axial direction of the feed shaft 6, and more accurate between the friction disk 1, the inner clutch board 3, and the outer clutch board 4. Frictional power can be generated. Further, since the friction disk 1 is inserted into the mandrel 21, the elastic force transmitted by the compression spring 23 to the friction disk 1 is pressed in the axial direction by the guide of the mandrel 21, and the entire friction disk 1 is balanced in the axial direction. The taken circumferential surface pressure is transmitted to the inner clutch panel 3 or the outer clutch panel 4. On the other hand, the compression spring 23 uses a low spring coefficient, and reduces pressure fluctuation with respect to axial movement when compressed to a predetermined pressure. In addition, the user can adjust the compression distance of the compression spring 23 to an appropriate pressure with the adjusting bolt 24 and the fixing bolt 25 as needed.

It is a three-dimensional combination schematic diagram of the present invention. It is a three-dimensional combination diagram according to another view angle of the present invention. It is the decomposition | disassembly solid schematic of this invention. 1 is a schematic sectional view of a friction disk according to the present invention. It is the cross-sectional schematic of the XX local part in FIG. It is the combination cross-sectional schematic of this invention. It is a decomposition | disassembly solid schematic diagram of the linkage mechanism of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Friction disk 11 Shaft collar 12 Mounting groove 13 1st friction surface 14 2nd friction surface 15 Friction medium 151 Ventilation groove 17 Filter 2 Transmission device 21 Mandrel 211 Restriction ring 212 Male thread 213 Tightening hole 214 Fixing screw 23 Compression spring 24 Adjustment bolt 25 Mounting bolt 3 Inner clutch disk 31, 41 Friction surface 32, 42 Mounting hole 33 Back support wheel 4 Outer clutch disk 42 Passing hole 44 Axle rod 45 Thrust bearing 46 Interlocking ring 47 Engagement mechanism 5 Linkage mechanism 51 Mounting base 52 Crankshaft 53 Eccentric ring 54 Bifurcated lever 6 Feeding shaft 7 Lower shaft A Towing bar B Towing bar 10 Dust-proof ring

Claims (5)

Mainly composed of friction disk, transmission device, inner clutch panel, outer clutch panel and linkage mechanism,
The friction disk is provided with a shaft collar on the back surface of the disc body, and provided with a mounting groove facing the shaft collar. A first friction surface and a second friction surface are provided on the inner edge of the disc body, and the first friction surface and the first friction surface are provided. Two friction surfaces are coated with one layer of friction medium, the first friction surface is provided in the edge of the disc body perpendicular to the ring shape, and the second friction surface is provided adjacent to the radial direction of the inner ring of the first friction surface;
The drive device is a transmission device that transmits the rotational force amount of the friction disk to the feed shaft. The drive device is mainly composed of components such as a mandrel, two support protrusions, a compression spring, an adjustment bolt, and a mounting bolt. A hollow shaft body is provided, a male screw thread is provided at the end of the shaft tube, a tightening hole and a screw hole penetrating the mandrel are provided at predetermined positions of the tube body of the new shaft, and the mandrel is fixed by a fixing screw. Fasten to the feed shaft by tightening to the tightening hole.
The inner clutch panel is formed with a ring-shaped friction surface on the edge on one side of the disk body, combined with the friction surface and the second friction surface, provided with a mounting hole at an appropriate position on the edge of the disk body, and connected to the traction bar of the pendulum mechanism The inner clutch disc is fixed to the feed shaft in the axial direction by the back support ring and the mandrel limit ring.
The outer clutch panel is provided with a disk body to be combined with the first friction surface, the inner edge of the disk body is provided with a ring-shaped friction surface in the vertical direction, and a few through holes and one mounting hole are provided on the rear surface of the disk body. Connected by the traction bar of the mechanism, a shaft bar is provided by molding at the center of the board body, and prepared for turning and interlocking of the linkage mechanism,
The linkage mechanism is a mechanism that reciprocates by the power of the lower shaft of the sewing machine, and its working end and the shaft bar of the outer clutch disk are rotated and interlocked.
With the above-described components, the inner clutch disc is fixed to the feed shaft by the mandrel and the back support ring, and the friction disc, the compression spring, the adjusting bolt and the mounting bolt are sequentially inserted into the mandrel, and the second friction of the friction disc. By tightening the adjusting bolt and the mounting bolt to the compression spring after making contact with the surface and the inner clutch panel, the compression energy of the compression spring shaft acts on the friction disk, and the outer clutch disk rotates freely to the feed shaft, and the inner clutch disk The friction surface and the first friction surface of the friction disk are brought into contact with each other, whereby the thrust of the pendulum mechanism is transmitted to the friction disk in stages via the outer clutch disk and the inner clutch disk, and the feed shaft A sewing machine feed transmission device clutch mechanism comprising: an intermittent constant direction rotation of the sewing machine;   2. The clutch mechanism of a sewing machine feed transmission device according to claim 1, wherein the second friction surface of the friction disk is provided with a ring-shaped cone, and the ring-shaped friction surface of the inner clutch disk is also provided with a cone to act in combination. .   2. The clutch mechanism of a sewing machine feed transmission device according to claim 1, wherein the friction disk is provided with a slight ventilation groove in the axial direction on the surface of the second friction surface.   2. The sewing machine feed transmission according to claim 1, wherein the friction disk is provided with a ventilation hole at a predetermined position of the disk body, a filter is provided inside the ventilation hole, and a dust-proof ring is inserted into each edge of the friction disk disk body. The clutch mechanism of the device. The linkage mechanism is composed of a mounting base, a crankshaft, an eccentric wheel, and a bifurcated lever. The mounting base is fastened to and supported by a sewing machine base, one end of the crankshaft is pivoted to the mounting base, and the other end is pivoted by a bifurcated laver. The eccentric wheel is attached to the lower shaft of the sewing machine with the socket, the bifurcated lever is interlocked with the socket of the eccentric wheel, and the working end of the bifurcated lever is pivoted to the interlocking ring. 2. The clutch mechanism of a sewing machine feed transmission device according to claim 1, wherein the clutch mechanism pulls the outer clutch disk and reciprocates in the axial direction on the feed shaft.

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