Clamping device for feedback crank machining

Abstract

The utility model discloses a clamping device for feedback crank machining, and belongs to the technical field of sewing machines. The clamping device for feedback crank machining comprises a clamp body. The clamp body is of a disc-shaped structure, and a fixing assembly capable of being used for being matched with an assembling hole is arranged at the axis of the front face of the clamp body. According to the clamping device for machining the feedback crank, by arranging the positioning core-expanding mandrel on the positioning core-expanding base, when the feedback crank needs to be machined, the feedback crank is arranged on the surface of the positioning core-expanding mandrel in a sleeving mode, and the feedback crank is arranged on the surface of the positioning core-expanding mandrel in a sleeving mode through an assembling hole of the feedback crank; after a fastening screw is inserted into the positioning core expanding seat for threaded connection to fix the feedback crank, a milling procedure is adopted to cut the lower machining part, the clamp body is rotated after cutting, the position of the upper machining part is adjusted, then the upper machining part is cut, the feedback crank does not need to be disassembled repeatedly, the structure is simple, and the machining efficiency is high. Time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a clamping device used for feedback crank processing. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. The sewing machine can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, and products such as leather, plastic, and paper. The stitches are neat, beautiful, flat, and firm. The sewing speed is fast and the use is easy. It has also spawned art forms such as hand-push embroidery and computer embroidery.

[0003] A feedback crank is required during the use of the sewing machine, and its processing procedures include milling, drilling, tapping and other procedures on different processing surfaces. After drilling, the feedback crank needs to be installed on a fixture to mill two side grooves. However, due to the special-shaped setting of the feedback crank itself, the traditional processing method requires transverse milling of two grooves in the middle of the upper processing part and the lower processing part of the feedback crank. However, after processing one side groove, when processing another side groove, the staff needs to disassemble the feedback crank, adjust the position and then re-fix it, which is more troublesome, and repeated clamping is prone to large errors. The qualified rate of finished products is low. At the same time, the traditional processing method will lead to a long processing cycle of the feedback crank and low production efficiency. Utility Model Content

[0004] In view of the problems existing in the above-mentioned prior art, the utility model provides a clamping device for feedback crank processing, which has the technical effect of positioning parts without the need for repeated disassembly and installation.

[0005] In order to solve the above technical problems and achieve the above technical effects, the present invention is implemented through the following technical solutions:

[0006] The technical solution of the utility model is: a clamping device for feedback crank processing, including a clamp body; the clamp body is a disc-shaped structure, and a fixing component that can be used to cooperate with the assembly hole is arranged at the front axis of the clamp body, and the fixing component includes a positioning core seat fixedly connected to the front axis of the clamp body, and a positioning core shaft for placing the assembly hole is fixedly installed on the outer end of the positioning core seat, and a locking piece for fixing the feedback crank to be processed to the positioning core shaft is arranged in the positioning core shaft; a positioning pin for cooperating with the lower processing part is arranged on the front of the clamp body, and the positioning pin is located on one side of the fixing component, and a plurality of mounting holes penetrating the front and rear surfaces of the clamp body are arranged on the surface circumference of the clamp body, and the plurality of mounting holes are evenly distributed around the axis of the clamp body.

[0007] Furthermore, the positioning core shaft includes a support piece fixedly mounted on the outer end surface of the positioning core seat, and there are four support pieces. The plurality of support pieces are evenly arranged around the axis of the positioning core seat, and a support hole is formed at the center of the four support pieces. The locking piece includes a fastening screw arranged inside the support hole, and a threaded hole for matching with the fastening screw is arranged in the positioning core seat.

[0008] Furthermore, the opening of the support hole is chamfered, and the top of the fastening screw is provided with a hexagonal slot.

[0009] Furthermore, a telescopic groove is formed between every two adjacent expansion pieces, and the length of the positioning core shaft is smaller than the length of the fastening screw.

[0010] Furthermore, three mounting holes are provided, and the three mounting holes are designed in a triangle with the positioning core seat as the center.

[0011] Furthermore, the outer diameter of the positioning core shaft is 0.5 mm smaller than the outer diameter of the positioning core seat, and the outer diameter of the positioning core shaft is 0.02-0.03 mm smaller than the inner diameter of the assembly hole.

[0012] Furthermore, small holes are vertically opened inside the lower processing part and the upper processing part, the diameter of the positioning pin is 0.02-0.04mm smaller than the small hole in the lower processing part, and the distance between the positioning pin and the positioning core shaft is the same as the hole distance between the assembly hole and the lower processing part.

[0013] Furthermore, the height of the positioning pin is greater than the height of the positioning core seat, and the height of the raised portion is not greater than the thickness of the lower processed portion at the bottom after processing.

[0014] The beneficial technical effect of the utility model is as follows: by setting a positioning core shaft on the positioning core seat, when the feedback crank needs to be processed, the feedback crank is sleeved on the surface of the positioning core shaft, and is sleeved on the surface of the positioning core shaft through the assembly hole of the feedback crank, and then the fastening screw is inserted into the positioning core seat for threaded connection to fix the feedback crank, and then the lower processing part is cut by a milling process, and the clamp body is rotated after cutting to adjust the position of the upper processing part, and then the upper processing part is cut, without repeatedly disassembling the feedback crank, and the setting of the positioning pin can assist in positioning the feedback crank to prevent the feedback crank from being bent. Errors occurred during the installation of the handle, affecting the processing accuracy of the feedback crank. Therefore, the device was pressed on the rotating axis in the CNC center, and the CNC technology of the machining center was used to complete multiple processes in the machining center at one time. The product quality was very consistent, the turnover time between processes was reduced, the efficiency was increased by 150%, and the product qualification rate was increased from 93% to 99%. While replacing the traditional single-process processing method, it also avoided the problem of cumbersome processing steps and prone to errors due to the traditional processing method, which resulted in the need to disassemble the feedback crank for re-positioning and reinstalling after processing the lower processing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the structure of the clamping device of the utility model and the part to be processed;

[0016] Figure 2 It is a schematic diagram of the structure explosion of the utility model;

[0017] Figure 3 It is a three-dimensional schematic diagram of the structure of the utility model in which the processed parts are installed on the fixture body;

[0018] Figure 4 It is a three-dimensional schematic diagram of the structure of the parts to be processed in the utility model;

[0019] Figure 5 It is a three-dimensional schematic diagram of the structure of the processed parts of the utility model.

[0020] The numbers and letters in the figure represent the corresponding component names:

[0021] 1. Clamp body; 2. Opening piece; 21. Opening hole; 3. Positioning pin; 4. Fastening screw; 5. Feedback crank; 51. Lower processing part; 52. Upper processing part; 53. Assembly hole; 6. Positioning core seat; 7. Mounting hole. DETAILED DESCRIPTION

[0022] In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0023] See attached Figure 1-2 As shown, the clamping device for feedback crank processing of the first embodiment includes a clamp body 1;

[0024] The fixture body 1 has a disc-shaped structure, and a fixing component that can be used to cooperate with the assembly hole 53 is arranged at the front axis of the fixture body 1. The fixing component includes a positioning core seat 6 fixedly connected to the front axis of the fixture body 1, and a positioning core shaft for placing the assembly hole 53 is fixedly installed on the outer end of the positioning core seat 6. A locking piece for fixing the feedback crank 5 to be processed and the positioning core shaft is arranged in the positioning core shaft. When the feedback crank 5 needs to be processed, the feedback crank 5 is sleeved in the positioning core shaft through its own assembly hole 53, and then the locking piece is inserted into it. The positioning core shaft will stretch and fix the feedback crank 5, and the locking piece will fix the feedback crank 5 at the same time.

[0025] The positioning core shaft includes a spreading piece 2 fixedly mounted on the outer end surface of the positioning core seat 6, and four spreading pieces 2 are provided. The plurality of spreading pieces 2 are evenly arranged around the axis of the positioning core seat 6, and a spreading hole 21 is formed at the center of the four spreading pieces 2. The locking piece includes a fastening screw 4 arranged inside the spreading hole 21, and a threaded hole for matching the fastening screw 4 is provided in the positioning core seat 6. A positioning pin 3 for cooperating with the lower processing part 51 is provided on the front side of the clamp body 1, and the positioning pin 3 is located on one side of the fixed component. A telescopic groove is formed between every two adjacent spreading pieces 2, and the length of the positioning core shaft is less than the length of the fastening screw 4.

[0026] After the feedback crank 5 is sleeved on the positioning core shaft, the fastening screw 4 is inserted into the expansion hole 21. When it is screwed into the threaded hole on the positioning core seat 6, the fastening screw 4 will expand the four expansion pieces 2 so that the expansion pieces 2 fit against the inner wall of the assembly hole 53 of the feedback crank 5. Then the nut on the top of the fastening screw 4 will limit the feedback crank 5.

[0027] A plurality of mounting holes 7 penetrating the front and rear surfaces of the clamp body 1 are arranged on the circumference of the surface of the clamp body 1 , and the plurality of mounting holes 7 are evenly distributed around the axis of the clamp body 1 .

[0028] The clamp body 1 can be installed on the rotating shaft through the mounting holes 7 for rotating the clamp body 1 , and the three mounting holes 7 can be evenly stressed, so that the clamp body 1 is more stable when rotating.

[0029] The feedback crank 5 includes a lower processed portion 51 , an upper processed portion 52 and an assembly hole 53 .

[0030] The opening of the internal threaded hole of the positioning core seat 6 is chamfered, and a hexagonal groove is provided at the top of the fastening screw 4. The outer diameter of the positioning core shaft is 0.5 mm smaller than the outer diameter of the positioning core seat 6, and the outer diameter of the positioning core shaft is 0.02-0.03 mm smaller than the inner diameter of the assembly hole 53. Small holes are vertically penetrated inside the lower processing part 51 and the upper processing part 52. The diameter of the positioning pin 3 is 0.02-0.04 mm smaller than the small hole in the lower processing part 51, and the distance between the positioning pin 3 and the positioning core shaft is the same as the hole distance between the assembly hole 53 and the lower processing part 51.

[0031] The height of the positioning pin 3 is greater than the height of the positioning core seat 6, and the height of the raised portion is not greater than the thickness of the bottommost lower processed portion 51 after processing, thereby avoiding the problem of processing the lower processed portion 51 together with the positioning pin 3 during processing.

[0032] Before installation, the feedback crank 5 has been processed with an assembly hole 53. After being installed on the fixed component through the assembly hole 53, a milling cutter is required to transversely mill the middle parts of the lower processing part 51 and the upper processing part 52 on the feedback crank 5, so that the lower processing part 51 and the upper processing part 52 are each divided into two annular seats. Through the arrangement of the clamping component, it is not necessary to rotate the clamp body 1 after cutting the lower processing part 51, so that the upper processing part 52 moves to the vicinity of the milling cutter, and then the milling cutter cuts the upper processing part 52. There is no need to repeatedly disassemble and adjust the feedback crank 5. While improving the processing efficiency, it also avoids the deviation of the feedback crank 5 caused by repeated disassembly and installation. When cutting, it is also necessary to disassemble the feedback crank 5, adjust the position, and then install it, and then cut the upper processing part 52.

[0033] See attached Figure 3-5 As shown, the assembly hole 53 extends inward from the top of the feedback crank 5 to the end of the feedback crank 5. A fixing hole for matching the fastening screw 4 is provided at the top of the assembly hole 53. Connecting holes compatible with the positioning pin 3 are provided inside the upper processing part 52 and the assembly hole 53. A hidden groove capable of accommodating the fastening screw 4 is provided at the end of the assembly hole 53 away from the positioning core seat 6. During installation, the feedback crank 5 is sleeved on the positioning core shaft, and then the positioning pin 3 is inserted into the lower processing part 51 for positioning. Finally, the fastening screw 4 is inserted into the support hole 21 and tightened through the threaded hole. After tightening, the fastening screw 4 enters the support hole 21 to support the support sheet 2 and press against the inside of the assembly hole 53 to fix the feedback crank 5. Then, a milling cutter is used to mill the middle position of the lower processing part 51 and the upper processing part 52.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A clamping device for feedback crank processing, characterized in that: include: A fixture body (1); The clamp body (1) is in the form of a disc, and a fixing component capable of cooperating with the assembly hole (53) is arranged at the front axis of the clamp body (1), and the fixing component comprises a positioning core seat (6) fixedly connected to the front axis of the clamp body (1), and a positioning core shaft for accommodating the assembly hole (53) is fixedly mounted on the outer end of the positioning core seat (6), and a locking member for fixing the feedback crank (5) to be processed to the positioning core shaft is arranged inside the positioning core shaft; A positioning pin (3) for cooperating with the lower processing portion (51) is arranged on the front side of the clamp body (1), and the positioning pin (3) is located on one side of the fixing component. A plurality of mounting holes (7) penetrating the front and rear surfaces of the clamp body (1) are arranged on the circumference of the surface of the clamp body (1), and the plurality of mounting holes (7) are evenly distributed around the axis of the clamp body (1).

2. The clamping device for feedback crank machining according to claim 1, characterized in that: The positioning core shaft comprises a spreading piece (2) fixedly mounted on the outer end surface of the positioning core seat (6), four spreading pieces (2) are provided, and the plurality of spreading pieces (2) are evenly arranged around the axis of the positioning core seat (6), and a spreading hole (21) is formed at the center of the four spreading pieces (2), and the locking member comprises a fastening screw (4) arranged inside the spreading hole (21), and a threaded hole for matching with the fastening screw (4) is provided inside the positioning core seat (6).

3. The clamping device for feedback crank machining according to claim 2, characterized in that: The opening of the support hole (21) is chamfered, and the top of the fastening screw (4) is provided with a hexagonal slot.

4. The clamping device for feedback crank machining according to claim 2, characterized in that: A telescopic groove is formed between every two adjacent expansion pieces (2), and the length of the positioning core expansion mandrel is less than the length of the fastening screw (4).

5. The clamping device for feedback crank machining according to claim 2, characterized in that: Three mounting holes (7) are provided, and the three mounting holes (7) are designed in a triangular shape with the positioning core seat (6) as the center.

6. The clamping device for feedback crank machining according to claim 2, characterized in that: The outer diameter of the positioning core shaft is 0.5 mm smaller than the outer diameter of the positioning core seat (6), and the outer diameter of the positioning core shaft is 0.02-0.03 mm smaller than the inner diameter of the assembly hole (53).

7. The clamping device for feedback crank machining according to claim 1, characterized in that: Small holes are vertically penetrated inside the lower processing part (51) and the upper processing part (52); the diameter of the positioning pin (3) is 0.02-0.04 mm smaller than the small hole in the lower processing part (51); and the distance between the positioning pin (3) and the positioning core shaft is the same as the hole distance between the assembly hole (53) and the lower processing part (51).

8. The clamping device for feedback crank machining according to claim 1, characterized in that: The height of the positioning pin (3) is greater than the height of the positioning core seat (6), and the height of the raised portion is not greater than the thickness of the lower processed portion (51) at the bottom after processing.

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