A cutter clutch mechanism for a lockstitch sewing machine with a side cutter

Abstract

The present invention discloses a cutter clutch mechanism of a flat-bed sewing machine with a side cutter, comprising a transmission device and a cutter device, wherein the transmission device comprises an upper shaft, an eccentric cam, a needle bearing, a plurality of connecting rod cranks and an adjusting wrench, and the cutter device comprises a cutter joint, a cutter shaft, a cutter frame, two cutter seats and a cutter head, wherein the upper shaft of the transmission device is inserted into the eccentric cam and then covered with a needle bearing, and is connected to the cutter joint in the cutter device through the transmission of a plurality of connecting rod cranks, wherein the cutter joint is fixed to the upper end of the cutter shaft, and the lower end of the cutter shaft is connected to the cutter head through two cutter seats. The present invention discloses a cutter clutch mechanism of a flat-bed sewing machine with a side cutter, wherein the cutter head is always fixed to the cutter shaft, a clutch pin is not required, and the cutter device is driven to move synchronously up and down through the transmission device, and the sewing and cutting operations are made simpler and more convenient through the control of the adjusting wrench.

Description

Technical Field

[0001] The invention relates to a lockstitch sewing machine in an industrial sewing machine, in particular to a cutter clutch mechanism of the lockstitch sewing machine with a side cutter. Background Art

[0002] A flat-bed sewing machine is a flat sewing device that can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products such as leather, plastic, and paper. Thin materials sewn by flat-bed sewing machines are generally used for knitting, underwear, shirts, uniforms, etc., and thick materials sewn by flat-bed sewing machines are generally used for various sportswear, jeans, fashions, coats, shoes and hats, leather goods, bags, etc. After sewing is completed, a cutting device is required to cut off the excess part of the edge of the sewing product.

[0003] However, the existing lockstitch sewing machine with side cutter has the cutting cutter installed on the side of the sewing needle of the lockstitch sewing machine, and sewing and cutting are performed in linkage, and a combination of clutch pins and clutch pin shafts and other accessories is used, and the adjustment steps are relatively cumbersome and the operation is not very convenient. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a cutter clutch mechanism of a lockstitch sewing machine with a side cutter, in which the cutter frame and the cutter head are always fixed on the cutter shaft, and the cutter device is installed at the rear of the sewing needle bar. No clutch pin is required, and the position of the cutter can still be adjusted as needed. When shearing, the cutter device is lowered to make the cutter bar and the needle bar move up and down synchronously, realizing the linkage operation of sewing first and then shearing. When cutting is not needed, the cutter device is lifted to separate the cutter frame from the cutter bar. The operation is very simple and convenient.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the present invention is: a cutter clutch mechanism of a lockstitch sewing machine with a side cutter, which includes a transmission device and a cutter device, the transmission device includes an upper shaft, an eccentric cam, a needle bearing, a cutter connecting rod, an adjustment crank, an adjustment connecting rod, a small connecting rod, an intermediate connecting rod, a connecting rod pin, a clutch crank, an adjustment shaft and an adjustment wrench, the cutter device includes a cutter joint, a cutter shaft, a cutter movable seat, a cutter frame, a cutter fixed seat and a cutter head, the transmission device is connected to the cutter device and is also connected to a fixed component, the fixed component includes a fixed crank, a fixed shaft and a crank pin, the upper shaft in the transmission device is in the shape of a long solid cylinder, the outer side of which is connected to the transmission system of the sewing equipment, and the inner side drives the transmission device, the adjustment shaft is in the shape of a long cylindrical strip with a circular ring groove in the middle The upper part of the clutch crank is a disc with a large hole, and a short pin is provided on the inner side of its lower end. The front end of the adjusting wrench is provided with a lateral circular hole, and the rear end is provided with a flat handle. The large hole on the upper part of the clutch crank is sleeved on the outer part of the adjusting shaft, and the lateral circular hole on the front end of the adjusting wrench is sleeved on the outer end of the adjusting shaft and fixed. The small connecting rod is in the shape of a straight handle with two discs at both ends, and a small hole is provided in each of the upper and lower discs, and a boss is provided on the side of the lower disc. The fixed shaft is in the shape of two hollow cylinders with different thicknesses, the outer end part is slightly thicker and the inner part is slightly thinner. The outer part is fixed to the body of the sewing equipment, and the inner part is connected to the transmission device through the fixed crank. The cutter joint is in the shape of an annular clamp and has a pin on the side. The pin is connected to the transmission device, and the clamp is connected to the cutter device.

[0006] The upper part of the cutter connecting rod is a large circular ring, and the lower part is a crank with a small circular hole. The inner side of the upper shaft is inserted into the eccentric cam and then the needle bearing is covered. The needle bearing is embedded in the large circular ring on the upper part of the cutter connecting rod. When the eccentric cam is running, it drives the cutter connecting rod to reciprocate up and down.

[0007] The upper part of the adjusting crank is a disc with a large hole, and the lower end of the handle body is provided with a middle hole. The large hole on the upper part of the adjusting crank is sleeved on the inner part of the adjusting shaft for positioning.

[0008] The adjusting connecting rod is in the shape of a crank with two discs at both ends, a middle connecting hole is provided in the disc at the upper end, and a small connecting hole is provided in the disc at the lower end. The short pin shaft on the inner side of the lower end of the clutch crank is sequentially inserted into the middle hole at the lower part of the adjusting crank and the middle connecting hole at the upper end of the adjusting crank for positioning.

[0009] The upper part of the fixed crank is provided with a disc with a small hole, and the lower part is provided with a disc with a large hole. The inner side of the fixed shaft is inserted into the large hole of the lower disc of the fixed crank, and the crank pin is sequentially inserted into the small hole of the upper disc of the fixed crank, the small hole of the lower part of the cutter connecting rod, the small connecting hole of the lower disc of the adjusting connecting rod, and the small hole of the disc at the lower part of the small connecting rod for fixing.

[0010] The middle connecting rod is also in the shape of a straight handle with two discs at both ends, and a small hole is respectively provided in the left and right discs. The connecting rod pin is sequentially inserted into the small hole of the right disc of the middle connecting rod and the small hole of the lower disc of the small connecting rod for fixation.

[0011] The pin shaft on the side of the cutter joint is inserted into the small hole of the left disk of the middle connecting rod for fixing. When the cutter connecting rod reciprocates up and down, the cutter joint is driven to move up and down by the adjusting connecting rod and the middle connecting rod.

[0012] The clamp of the cutter joint is sleeved on the upper part of the cutter shaft, and the cutter shaft is clamped and fixed after the clamp on the cutter joint is tightened by screws.

[0013] The cutter movable seat is provided with a fixed circular hole in the middle, a fork-shaped double head on the left, a rectangular plane on the right, a threaded hole in the middle of the rectangular plane, and the lower end of the cutter shaft is inserted into the fixed circle in the middle of the cutter movable seat.

[0014] The cutter frame is a combination of two upper and lower grooves, which are connected horizontally at a right angle. A long adjustment hole is provided on the side of the upper groove, and a small round threaded hole is provided on the side of the lower groove. A screw is inserted into the long adjustment hole on the side of the upper groove of the cutter frame and fixed to the threaded hole on the right rectangular plane of the cutter moving block.

[0015] The cutter fixing seat is a right-angled combination of two rectangular blocks, the thickness of the transverse rectangular block is thinner than that of the longitudinal rectangular block, an elliptical long hole is provided in the middle of the transverse rectangular block, and three threaded holes are opened on the longitudinal rectangular block from top to bottom. Screws are inserted into the long holes of the transverse rectangular block of the cutter fixing seat and screwed into the small round threaded holes on the side of the groove at the bottom of the cutter frame for fixing.

[0016] The upper part of the cutting head is a double-headed fork, and the lower part is a cutter head. The whole is in the shape of a sheet. A screw is threaded into the middle of the double-headed fork on the upper part of the cutting head and screwed into one of the three threaded holes of the longitudinal rectangular block of the cutter fixing seat to fix it. The position of the cutting head is moved up when it is fixed in the upper threaded hole, and the position of the cutting head is lowered when it is fixed in the lower threaded hole.

[0017] Advantages of the present invention

[0018] The invention discloses a cutter clutch mechanism of a lockstitch sewing machine with a side cutter. The transmission device, the cutter device and the fixing assembly cooperate with each other, and the whole device is installed on the lockstitch sewing machine. A clutch pin is not required. The cutter frame and the cutter head are always fixed on the cutter shaft. The cutter can be moved up and down or not moved by operating the adjustment wrench as needed during the sewing process to complete the action of cutting and not cutting materials. The operation and use are very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a component exploded view of a cutter clutch mechanism of a lockstitch sewing machine with a side cutter according to an embodiment of the present invention;

[0020] Figure 2 A diagram showing the lifting of a cutter of a cutter clutch mechanism of a lockstitch sewing machine with a side cutter according to an embodiment;

[0021] Figure 3 A diagram showing the descent of a cutter of a cutter clutch mechanism of a lockstitch sewing machine with a side cutter according to an embodiment;

[0022] Among them: 1-upper shaft, 2-eccentric cam, 3-needle bearing, 4-cutter connecting rod, 5-adjusting crank, 6-adjusting connecting rod, 7-small connecting rod, 8-middle connecting rod, 9-connecting rod pin, 10-cutter joint, 11-cutter shaft, 12-cutter moving seat, 13-cutter frame, 14-cutter fixed seat, 15-cutter head, 16-fixed crank, 17-fixed shaft, 18-crank pin, 19-clutch crank, 20-adjusting wrench, 21-adjusting shaft. DETAILED DESCRIPTION

[0023] The following is a real-time method of the present invention described by a specific specific embodiment. A technician who is familiar with the principle of a flat-bed sewing machine cutter can easily obtain other advantages and improvements brought about by the flat-bed sewing machine cutting from the invention content presented in this specification. Obviously, this embodiment is only a part of the embodiments of the present invention, not all of them. All other embodiments obtained by technicians in this field without making improvements or innovations to the technology are within the scope of protection of the present invention.

[0024] like Figure 1As shown, this embodiment provides a component exploded view of a cutter clutch mechanism of a side cutter sewing machine: it includes a transmission device and a cutter device, the transmission device includes an upper shaft 1, an eccentric cam 2, a needle bearing 3, a cutter connecting rod 4, an adjustment crank 5, an adjustment connecting rod 6, a small connecting rod 7, an intermediate connecting rod 8, a connecting rod pin 9, a clutch crank 19, an adjustment shaft 21 and an adjustment wrench 20, the cutter device includes a cutter joint 10, a cutter shaft 11, a cutter movable seat 12, a cutter frame 13, a cutter fixed seat 14 and a cutter head 15, the transmission device is connected to the cutter device and is also connected to a fixed component, the fixed component includes a fixed crank 16, a fixed shaft 17 and a crank pin 18, the upper shaft in the transmission device is a long solid cylinder shape, its outer side is connected to the transmission system of the sewing equipment, and its inner side drives the transmission device, the adjusting shaft is in the shape of a long cylindrical strip with a circular groove in the middle, the upper part of the clutch crank is a disc with a large hole, and a short pin is provided on the inner side of the lower end, the front end of the adjusting wrench is provided with a lateral circular hole, and the rear end is provided with a flat handle, the large hole on the upper part of the clutch crank is sleeved on the outer part of the adjusting shaft, and the lateral circular hole on the front end of the adjusting wrench is sleeved on the outer end of the adjusting shaft and fixed, the small connecting rod is in the shape of a straight handle with two discs, a small hole is provided in the upper and lower discs, and a boss is provided on the side of the lower disc, the fixed shaft is in the shape of two hollow cylinders with different thicknesses, the outer end part is slightly thicker, the inner part is slightly thinner, and its outer part is connected to the sewing equipment The body is fixed, and its inner side is connected to the transmission device through a fixed crank. The cutter joint is in the shape of an annular clamp and has a pin shaft on the side. The pin shaft is connected to the transmission device, and the clamp is connected to the cutter device. The upper part of the cutter connecting rod is a large ring, and the lower part is a crank with a small round hole. The inner side of the upper shaft is penetrated into the eccentric cam and then the outer needle bearing is covered. The needle bearing is embedded in the large ring on the upper part of the cutter connecting rod. When the eccentric cam is running, it drives the cutter connecting rod to reciprocate up and down. The upper part of the adjusting crank is a disc with a large hole, and a middle hole is opened at the lower end of the handle body. The large hole on the upper part of the adjusting crank is positioned on the inner part of the adjusting shaft. The adjusting connecting rod is in the shape of a crank with two discs, and a middle connection is provided in the disc at the upper end. Hole, a small connecting hole is provided in the disc at the lower end, the short pin shaft on the inner side of the lower end of the clutch crank is sequentially strung into the middle hole of the lower part of the adjusting crank and the middle connecting hole at the upper end of the adjusting crank for positioning, the upper part of the fixed crank is provided with a disc with a small hole, and the lower part is provided with a disc with a large hole, the inner side of the fixed shaft is strung into the large hole of the lower disc of the fixed crank, the crank pin shaft is sequentially strung into the small hole of the upper disc of the fixed crank, the small circular hole of the lower part of the cutter connecting rod, the small connecting hole of the lower disc of the adjusting connecting rod and the small hole of the disc at the lower part of the small connecting rod for fixing, the middle connecting rod is in the shape of a straight handle with two discs at both ends, a small hole is respectively provided in the discs on the left and right sides, the connecting rod pin shaft is sequentially strung into the small hole of the disc on the right side of the middle connecting rod and the small hole of the disc on the lower part of the small connecting rod for fixing.

[0025] like Figure 1 As shown, the pin shaft on the side of the cutter joint is strung into the small hole of the left disc of the middle connecting rod and fixed. When the cutter connecting rod reciprocates up and down, the cutter joint is driven to move up and down by adjusting the connecting rod and the middle connecting rod. The clamp of the cutter joint is sleeved on the upper part of the cutter shaft. The clamp on the cutter joint is tightened by a screw to clamp and fix the cutter shaft. A fixed circular hole is provided in the middle of the cutter moving seat, a fork-shaped double head is provided on the left, and a rectangular plane is provided on the right. A threaded hole is opened in the middle of the rectangular plane. The lower end of the cutter shaft is inserted into the fixed circle in the middle of the cutter moving seat. The cutter frame is a combination of upper and lower grooves, and the two grooves are connected to each other at right angles laterally. A long strip adjustment hole is provided on the side of the upper groove, and a small round threaded hole is provided on the side of the lower groove. A screw is inserted into the long strip adjustment hole on the side of the groove and fixed in the threaded hole on the right rectangular plane of the cutter moving block. The cutter fixing seat is a right-angle combination of two rectangular blocks. The thickness of the transverse rectangular block is thinner than that of the longitudinal rectangular block. An elliptical long hole is arranged in the middle of the transverse rectangular block, and three threaded holes are opened on the longitudinal rectangular block from top to bottom. A screw is inserted into the long strip hole of the transverse rectangular block of the cutter fixing seat and screwed into the small round threaded hole on the side of the groove at the bottom of the cutter frame for fixing. The upper part of the cutter head is a double-headed fork, and the lower part is a cutter head. The whole is in the shape of a sheet, and a screw is inserted into the middle of the double-headed fork on the upper part of the cutting head and screwed into one of the three threaded holes in the longitudinal rectangular block of the cutter fixing seat for fixing. The position of the cutter head fixed in the upper threaded hole moves up, and the position of the cutter head fixed in the lower threaded hole lowers.

[0026] like Figure 2 and Figure 3 As shown in the figure, there are respectively a cutter lifting diagram and a cutter lowering diagram of a cutter clutch mechanism of a lockstitch sewing machine with a side cutter in an embodiment. As shown in the figure, when the present invention is installed, the upper shaft is connected to the rotating device of the sewing device, and the fixed shaft is connected to the body of the sewing device. When the upper shaft is driven by the rotating device of the sewing device to rotate, the cutter connecting rod sleeved on the eccentric cam is driven to fluctuate up and down to complete the action of shearing the sewing material. Figure 2 As shown in the figure, lift the adjusting wrench upwards, and the cutter shaft is lifted upwards under the drive of the adjusting crank, adjusting connecting rod, small connecting rod, middle connecting rod and cutter joint, so that the cutter head fixed under the cutter shaft is lifted upwards. At this time, although the sewing equipment is running continuously, it will not produce shearing action on the cut material. Figure 3 As shown, by pressing the adjusting wrench downward, the cutter shaft is lowered downward under the drive of the adjusting crank, adjusting connecting rod, small connecting rod, middle connecting rod and cutter joint, so that the cutter head fixed under the cutter shaft is shifted downward. At this time, as long as the sewing equipment is running continuously, the shearing action of the cut material will be generated, and the action of sewing and cutting the sewing material at the same time can be completed, which greatly facilitates the sewing and cutting process and improves the production efficiency.

[0027] To sum up, the cutter clutch mechanism of a flat-bed sewing machine with a side cutter in this embodiment combines a transmission device, a cutter device, a fixing assembly and a material selection cutting mechanism. By using the mutual cooperation of various accessories, the whole device can be installed on the flat-bed sewing machine. After the cutter frame and the cutter head are always fixed on the cutter shaft, the selection and adjustment of sewing and cutting can still be completed during the sewing process without the need for a clutch pin, so that sewing and cutting can be carried out continuously, providing a convenient and efficient device for the sewing production of industrial flat-bed sewing machines.

[0028] The above embodiments should not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent conversion shall fall within the protection scope of the present invention.

Claims

1. A cutter clutch mechanism for a lockstitch sewing machine with a side cutter, characterized in that : It includes a transmission device and a cutter device, the transmission device includes an upper shaft, an eccentric cam, a needle bearing, a cutter connecting rod, an adjustment crank, an adjustment connecting rod, a small connecting rod, an intermediate connecting rod, a connecting rod pin shaft, a clutch crank, an adjustment shaft and an adjustment wrench, the cutter device includes a cutter joint, a cutter shaft, a cutter movable seat, a cutter frame, a cutter fixed seat and a cutter head, the transmission device is connected to the cutter device and is also connected to a fixed component, the fixed component includes a fixed crank, a fixed shaft and a crank pin, the upper shaft in the transmission device is in the shape of a long solid cylinder, the outer side of which is connected to the transmission system of the sewing equipment, and the inner side drives the transmission device, the adjustment shaft is in the shape of a long cylinder, and a circular groove is provided in the middle, the upper part of the clutch crank is a disc with a large hole, and its lower end A short pin is provided on the inner side, a lateral round hole is provided on the front end of the adjusting wrench, and a flat handle is provided on the rear end, the large hole on the upper part of the clutch crank is sleeved on the outer part of the adjusting shaft, and the lateral round hole on the front end of the adjusting wrench is sleeved on the outer end of the adjusting shaft and fixed, the small connecting rod is in the shape of a straight handle with two discs, a small hole is provided in each of the upper and lower discs, and a boss is provided on the side of the lower disc, the fixed shaft is in the shape of two hollow cylinders with different thicknesses, the outer end portion is slightly thicker and the inner portion is slightly thinner, the outer portion is fixed to the body of the sewing equipment, and the inner portion is connected to the transmission device through the fixed crank, the cutter joint is in the shape of an annular clamp, and has a pin on the side, the pin is connected to the transmission device, and the clamp is connected to the cutter device; The upper part of the cutter connecting rod is a large circular ring, and the lower part is a crank with a small circular hole. The inner side of the upper shaft is penetrated by the eccentric cam and then covered with a needle bearing. The needle bearing is embedded in the large circular ring on the upper part of the cutter connecting rod. When the eccentric cam is running, it drives the cutter connecting rod to reciprocate up and down. The upper part of the adjusting crank is a disc with a large hole, and the lower end of the handle body is provided with a middle hole. The large hole on the upper part of the adjusting crank is sleeved on the inner part of the adjusting shaft for positioning.

2. The cutter clutch mechanism of a lockstitch sewing machine with a side cutter according to claim 1, characterized in that The adjusting connecting rod is in the shape of a crank with two discs at both ends, a middle connecting hole is provided in the disc at the upper end, and a small connecting hole is provided in the disc at the lower end. The short pin shaft on the inner side of the lower end of the clutch crank is sequentially inserted into the middle hole at the lower part of the adjusting crank and the middle connecting hole at the upper end of the adjusting crank for positioning.

3. The cutter clutch mechanism of a lockstitch sewing machine with a side cutter according to claim 1, characterized in that The upper part of the fixed crank is provided with a disc with a small hole, and the lower part is provided with a disc with a large hole. The inner side of the fixed shaft is inserted into the large hole of the lower disc of the fixed crank. The crank pin is sequentially inserted into the small hole of the upper disc of the fixed crank, the small hole of the lower part of the cutter connecting rod, the small connecting hole of the lower disc of the adjusting connecting rod, and the small hole of the disc of the lower part of the small connecting rod for fixing.

4. The cutter clutch mechanism of a lockstitch sewing machine with a side cutter according to claim 1, characterized in that The middle connecting rod is also in the shape of a straight handle with two discs at both ends, and a small hole is provided in each of the left and right discs. The connecting rod pin is sequentially inserted into the small hole of the right disc of the middle connecting rod and the small hole of the lower disc of the small connecting rod for fixation.

5. A cutter clutch mechanism for a lockstitch sewing machine with a side cutter according to claim 1 or 3, characterized in that The pin shaft on the side of the cutter joint is inserted into the small hole of the left disc of the middle connecting rod and fixed. When the cutter connecting rod reciprocates up and down, the cutter joint is driven to move up and down by adjusting the connecting rod and the middle connecting rod.

6. The cutter clutch mechanism of a lockstitch sewing machine with a side cutter according to claim 1, characterized in that The middle of the clamp of the cutter joint is sleeved on the upper part of the cutter shaft, and the cutter shaft is clamped and fixed after the clamp on the cutter joint is tightened by screws.

7. The cutter clutch mechanism of a lockstitch sewing machine with a side cutter according to claim 1, characterized in that : A fixed circular hole is provided in the middle of the cutter movable seat, a fork-shaped double head is provided on the left side, and a rectangular plane is provided on the right side. A threaded hole is opened in the middle of the rectangular plane, and the lower end of the cutter shaft is inserted into the fixed circle in the middle of the cutter movable seat; the cutter fixed seat is a right-angle combination of two rectangular blocks, the thickness of the transverse rectangular block is thinner than that of the longitudinal rectangular block, an elliptical long hole is provided in the middle of the transverse rectangular block, and three threaded holes are opened on the longitudinal rectangular block from top to bottom. A screw is inserted into the long strip hole of the transverse rectangular block of the cutter fixed seat and screwed into the small round threaded hole on the side of the groove at the bottom of the cutter frame for fixing.

8. The cutter clutch mechanism of a lockstitch sewing machine with a side cutter according to claim 1 or 6, characterized in that : The cutter frame is a combination of two upper and lower grooves, the two grooves are connected horizontally at a right angle, a long adjustment hole is provided on the side of the upper groove, and a small round threaded hole is provided on the side of the lower groove. A screw is inserted into the long adjustment hole on the side of the upper groove of the cutter frame and fixed in the threaded hole on the right rectangular plane of the cutter moving block; the upper part of the cutter head is a double-headed fork, and the lower part is a cutter head, which is in a sheet shape as a whole. It is fixed by a screw inserted into the middle of the double-headed fork on the upper part of the cutting head and screwed into one of the three threaded holes in the longitudinal rectangular block of the cutter fixing seat. The position of the cutter head fixed in the upper threaded hole moves up, and the position of the cutter head fixed in the lower threaded hole lowers.

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