Trimming and presser foot lifting mechanism of two-needle sewing machine

Abstract

The utility model provides a thread trimming and presser foot lifting mechanism of a two-needle sewing machine, and particularly relates to the technical field of sewing machine manufacturing, the thread trimming and presser foot lifting mechanism is provided with a driver, a driving double cam, a presser foot lifting mechanism and a double thread trimming mechanism, the driver is provided with a driving shaft, the driving double cam is fixed on the driving shaft, and the driving double cam is provided with a presser foot lifting cam and a thread trimming cam; the presser foot lifting cam pushes the shaft sleeve to execute the presser foot lifting action of the presser foot lifting mechanism; the thread trimming cam pushes the first round pushing piece to execute the thread trimming action of the double-thread trimming mechanism, so that the presser foot lifting action and the thread trimming action of the double-needle sewing machine can be achieved only through one driver, and the double-needle sewing machine driver has high application and popularization value, the utilization rate of the sewing machine driver is effectively increased, and the double-needle sewing machine driver has high application and popularization value.

Description

Technical Field

[0001] The present application provides a thread trimming and presser foot lifting mechanism for a double-needle sewing machine, and specifically relates to the technical field of sewing machine manufacturing. Background Art

[0002] A double-needle sewing machine is a special machine among sewing machines. Its existing thread trimming mechanism uses an electromagnet as the thread trimming power, while the presser foot lifting mechanism uses other power devices. The patent of a thread trimming mechanism of a double-needle sewing machine with the announcement number CN104532491B discloses the following contents: it solves the problem that the existing sewing machine is difficult to complete the simultaneous trimming of two sutures. The thread trimming mechanism of the double-needle sewing machine includes two rotary hook platforms, both of which are fixedly connected with a fixed knife, and both rotary hook platforms are rotatably connected with a moving knife shaft, and the upper end of the moving knife shaft is fixedly connected with a moving knife, and the blade of the moving knife is fitted against the blade of the fixed knife. A driver is also provided in the housing, and a connecting rod structure is provided between the driver and the two moving knife shafts, which can drive the two moving knife shafts to reciprocate in opposite directions within a set angle. The thread trimming mechanism of the double-needle sewing machine is more convenient to install and debug, and has high thread trimming stability. It can hook the bottom thread and the surface thread at the same time to trim the thread and can trim two sutures at the same time. This solution uses the electromagnet 7 to drive the entire thread trimming mechanism. The utilization rate of the electromagnet 7 as a power is low, and the mechanical noise generated during use is relatively large. Summary of the invention

[0003] The present application is aimed at the problems of low power utilization rate of the thread trimming mechanism of the above-mentioned double-needle sewing machine and large mechanical noise generated by the electromagnet, and particularly proposes a thread trimming and presser foot lifting mechanism of the double-needle sewing machine, characterized in that it comprises a driver, a driving double cam, a presser foot lifting mechanism and a double thread trimming mechanism, the driver comprises a driving shaft, on which the driving double cam is fixed, the driving double cam comprises a presser foot lifting cam and a thread trimming cam, the presser foot lifting cam pushes the shaft sleeve to execute the presser foot lifting action of the presser foot lifting mechanism; the thread trimming cam pushes a circular pushing member to execute the thread trimming action of the double thread trimming mechanism, so that the presser foot lifting action and thread trimming action of the double-needle sewing machine can be realized by using only one driver, and has a high value of promotion and use.

[0004] The driver drives the double cams to realize the presser foot lifting action of the presser foot lifting mechanism of the sewing machine and the thread trimming action of the double thread trimming mechanism at different times. The driver is fixed on the base plate of the machine head, and the driver is located in the middle of the base plate.

[0005] The presser foot lifting cam and the thread trimming cam overlap in radial direction.

[0006] The presser foot lifting mechanism comprises a presser foot lifting rocker, a shaft sleeve, a presser foot lifting connecting rod, a presser foot lifting lever, a presser foot lifting push rod and a presser foot lifting terminal end. The shaft end of the presser foot lifting rocker can be movably arranged on a base plate, a shaft sleeve is fixed on the presser foot lifting rocker, the presser foot lifting rocker is hinged to the presser foot lifting connecting rod, the other end of the presser foot lifting connecting rod is hinged to the presser foot lifting lever, the other end of the presser foot lifting connecting rod is hinged to the presser foot lifting push rod, and the presser foot lifting push rod is indirectly connected to the presser foot lifting terminal end.

[0007] When the presser foot is to be lifted, the driver starts to rotate from the starting point to make the presser foot lifting cam push the shaft sleeve. Under the action of the presser foot lifting rocker, the presser foot lifting connecting rod is pushed to make the presser foot lifting lever lift the presser foot lifting push rod. The lifted presser foot lifting push rod pushes the presser foot lifting terminal to lift the presser foot from the lowered cloth pressing state to the highest position.

[0008] When the presser foot is lifted to the highest position, the driver rotates in the reverse direction to return to the starting point, and the presser foot lifting cam also rotates in the reverse direction to release the thrust on the sleeve. Under the action of the compression spring of the presser foot lifting mechanism itself, the presser foot is lowered from the highest position to the cloth pressing state.

[0009] The double thread trimming mechanism comprises a thread trimming slide bar, a circular push piece 1, a circular push piece 2, a push rod, a thread trimming rocker, a thread trimming rotating rod, a thread trimming push rod, a left thread trimming execution end, a right thread trimming execution end and a spring, and the thread trimming cam driving the double cam is located between the circular push piece 1 and the circular push piece 2 arranged on the thread trimming slide bar.

[0010] When the driver drives the double cams to drive, the thread trimming cam pushes the circular pusher 1 to execute the thread trimming action of the double thread trimming mechanism; when the driver drives the double cams to rotate in the opposite direction, the thread trimming cam pushes the circular pusher 2 to reset the double thread trimming mechanism.

[0011] The trimmer slide bar is movably arranged on the driver, the trimmer slide bar is connected to the push rod, the push rod is hinged to the trimmer rocker, a trimmer rotating rod is fixed on the trimmer rocker, the trimmer rotating rod is indirectly connected to the left trimmer execution end; a trimmer push rod is hinged on the trimmer rocker, the trimmer push rod is indirectly connected to the right trimmer execution end.

[0012] The double-thread trimming mechanism also has a spring, and a spring is also arranged between the thread trimming slide rod and the base plate, and the horizontal arrangement direction of the spring is substantially parallel to the thread trimming push rod.

[0013] The advantage of the present application is that the scheme of the present application cleverly utilizes the presser foot lifting cam and the thread trimming cam set on the driving double cam, and when the presser foot lifting cam pushes the shaft sleeve, the presser foot lifting action of the presser foot lifting mechanism can be performed; when the thread trimming cam pushes the circular pusher, the thread trimming action of the double thread trimming mechanism is performed. The mechanical noise generated by the use of the stepper driver is relatively low, which improves the working environment of the production workshop. Only one driver can realize both the presser foot lifting action and the thread trimming action, which effectively improves the utilization rate of the sewing machine driver and has a high value of promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a thread trimming and presser foot lifting mechanism of a double-needle sewing machine of the present application;

[0015] Figure 2 It is a schematic diagram of the structure of a thread trimming and presser foot lifting mechanism of a double-needle sewing machine of the present application;

[0016] Figure 3 It is a schematic diagram of a driving double cam of a thread trimming and presser foot lifting mechanism of a double-needle sewing machine of the present application;

[0017] Figure 4 It is an enlarged schematic diagram of a thread trimming mechanism of a double-needle sewing machine of the present application;

[0018] The numbers indicating the components in the above-mentioned Figure 0 are as follows:

[0019] Machine head 10, base plate 11, driver 20, driving shaft 21, driving double cam 30, presser foot lifting cam 31, thread trimming cam 32, presser foot lifting mechanism 40, presser foot lifting rocker 41, shaft sleeve 42, presser foot lifting connecting rod 43, presser foot lifting lever 44, presser foot lifting push rod 45, presser foot lifting terminal 46, double thread trimming mechanism 50, thread trimming slide bar 51, circular push member 1 52, circular push member 2 53, push rod 54, thread trimming rocker 55, thread trimming rotating rod 56, thread trimming push rod 57, left thread trimming executing end 58, right thread trimming executing end 59, spring 60. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-4 The preferred embodiments of the present application are described in detail so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application. These implementation modes are only used to illustrate the present invention, and are not intended to limit the present invention.

[0021] In conjunction with the above-mentioned drawings, a double-needle sewing machine of the present application comprises a machine head 10, a driver 20, a driving double cam 30, a presser foot lifting mechanism 40, a double thread trimming mechanism 50 and a control system, etc. The control system controls the operation of the driver 20, and only one driver 20 is used to drive the double cam 30 to realize the presser foot lifting action of the presser foot lifting mechanism 40 of the sewing machine and the thread trimming action of the double thread trimming mechanism 50 at different times. The scheme of the present application effectively improves the utilization rate of the sewing machine driver. The driver 20 is mounted and fixed on the base plate 11 of the machine head 10, and the driver 20 is located in the middle position of the base plate 11.

[0022] The driver 20 has a driving shaft 21, and the driving double cam 30 is fixed on the driving shaft 21. Under the control of the control system, the driver 20 implements a reciprocating operation mode to drive the driving double cam 30 to run clockwise or counterclockwise. The driving double cam 30 has a presser foot lifting cam 31 and a thread trimming cam 32, and the radial portion between the presser foot lifting cam 31 and the thread trimming cam 32 overlaps. The driver 20 preferably uses a stepping motor. In the use of this solution, the mechanical noise generated by the driver 20 is relatively low, which improves the working environment of the production workshop.

[0023] In the presser foot lifting mechanism 40 , the presser foot lifting mechanism 40 has components such as a presser foot lifting rocker 41 , a shaft sleeve 42 , a presser foot lifting connecting rod 43 , a presser foot lifting lever 44 , a presser foot lifting push rod 45 and a presser foot lifting terminal 46 .

[0024] The shaft end of the presser foot lifting rocker 41 is movably arranged on the base plate 11, and a shaft sleeve 42 is fixed on the presser foot lifting rocker 41. The presser foot lifting rocker 41 is hinged to the presser foot lifting connecting rod 43, and the other end of the presser foot lifting connecting rod 43 is hinged to the presser foot lifting lever 44, and the other end of the presser foot lifting lever 44 is hinged to the presser foot lifting push rod 45, and the presser foot lifting push rod 45 is indirectly connected to the presser foot lifting terminal 46.

[0025] When the presser foot is to be lifted, the driver 20 starts to rotate from the starting point to make the presser foot lifting cam 31 push the shaft sleeve 42, and under the action of the presser foot lifting rocker 41, the presser foot lifting connecting rod 43 is pushed so that the presser foot lifting lever 44 lifts the presser foot lifting push rod 45, and the lifted presser foot lifting push rod 45 pushes the presser foot lifting end 46 to lift the presser foot from the lowered cloth pressing state to the highest position. The presser foot lifting cam 31 of the present application pushes the shaft sleeve 42 to execute the presser foot lifting action of the presser foot lifting mechanism 40, which has the advantages of simple structure and low mechanical noise during operation.

[0026] When the presser foot is lifted to the highest position, the driver 20 rotates in the reverse direction to return to the starting point, and the presser foot lifting cam 31 also rotates in the reverse direction to release the thrust on the shaft sleeve 42. Under the action of the compression spring of the presser foot lifting mechanism 40, the presser foot is lowered from the highest position to the cloth pressing state.

[0027] In the above-mentioned double thread trimming mechanism 50, the double thread trimming mechanism 50 has components such as a thread trimming slide bar 51, a circular push member 1 52, a circular push member 2 53, a push rod 54, a thread trimming rocker 55, a thread trimming rotating rod 56, a thread trimming push rod 57, a left thread trimming actuator end 58, a right thread trimming actuator end 59 and a spring 60.

[0028] The thread trimming cam 32 driving the double cam 30 is located between the circular pusher 1 52 and the circular pusher 2 53 arranged on the thread trimming slide bar 51. When the driver 20 drives the double cam 30 to drive, the thread trimming cam 32 pushes the circular pusher 1 52 to execute the thread trimming action of the double thread trimming mechanism 50. When the driver 20 drives the double cam 30 to rotate in the opposite direction, the thread trimming cam 32 pushes the circular pusher 2 53 to reset the double thread trimming mechanism 50.

[0029] The above-mentioned trimmer slide bar 51 is movably arranged on the driver 20, the trimmer slide bar 51 is connected to the push rod 54, the push rod 54 is hinged to the trimmer rocker 55, a trimmer rotating rod 56 is fixed to the trimmer rocker 55, the trimmer rotating rod 56 is indirectly connected to the left trimmer execution end 58; a trimmer push rod 57 is hinged to the trimmer rocker 55, and the trimmer push rod 57 is indirectly connected to the right trimmer execution end 59. In addition, a spring 60 is further arranged between the trimmer slide bar 51 and the base plate 11, and the horizontal arrangement direction of the spring 60 is substantially parallel to the trimmer push rod 57.

[0030] The above is only one of the preferred implementation methods of the present application and is not intended to limit the present invention. The scope of the patent implementation of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made by using the shape, structure, and principle of the description and drawings of the present application, or directly or indirectly applied in other related technical fields; any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention are included in the patent protection scope of the present application.

Claims

1. A thread trimming and presser foot lifting mechanism for a double-needle sewing machine, characterized in that: The invention comprises a driver (20), a driving double cam (30), a presser foot lifting mechanism (40) and a double thread trimming mechanism (50). The driver (20) comprises a driving shaft (21), the driving double cam (30) is fixed on the driving shaft (21), the driving double cam (30) comprises a presser foot lifting cam (31) and a thread trimming cam (32), the presser foot lifting cam (31) pushes a shaft sleeve (42) to perform a presser foot lifting action of the presser foot lifting mechanism (40); the thread trimming cam (32) pushes a circular pushing member 1 (52) to perform a thread trimming action of the double thread trimming mechanism (50).

2. The thread trimming and presser foot lifting mechanism of a double-needle sewing machine according to claim 1, characterized in that: The driver (20) drives the double cams (30) to realize the execution of the presser foot lifting action of the sewing machine presser foot lifting mechanism (40) and the thread cutting action of the double thread cutting mechanism (50) at different times; the driver (20) is mounted and fixed on the base plate (11) of the machine head (10), and the driver (20) is located in the middle of the base plate (11).

3. The thread trimming and presser foot lifting mechanism of a double-needle sewing machine according to claim 1, characterized in that: The presser foot lifting cam (31) and the thread trimming cam (32) overlap in radial direction.

4. The thread trimming and presser foot lifting mechanism of a double-needle sewing machine according to claim 1, characterized in that: The presser foot lifting mechanism (40) comprises a presser foot lifting rocker (41), a shaft sleeve (42), a presser foot lifting connecting rod (43), a presser foot lifting lever (44), a presser foot lifting push rod (45) and a presser foot lifting end execution end (46). The shaft end of the presser foot lifting rocker (41) is movably arranged on the base plate (11), the shaft sleeve (42) is fixed on the presser foot lifting rocker (41), the presser foot lifting rocker (41) is hinged to the presser foot lifting connecting rod (43), the other end of the presser foot lifting connecting rod (43) is hinged to the presser foot lifting lever (44), the other end of the presser foot lifting lever (44) is hinged to the presser foot lifting push rod (45), and the presser foot lifting push rod (45) is indirectly connected to the presser foot lifting end execution end (46).

5. The thread trimming and presser foot lifting mechanism of a double-needle sewing machine according to claim 4, characterized in that: When the presser foot is to be lifted, the driver (20) starts to rotate from the starting point to make the presser foot lifting cam (31) push the shaft sleeve (42), and under the action of the presser foot lifting rocker (41), the presser foot lifting connecting rod (43) is pushed to make the presser foot lifting lever (44) lift the presser foot lifting push rod (45), and the lifted presser foot lifting push rod (45) pushes the presser foot lifting terminal (46) to lift the presser foot from the cloth pressing state to the highest position.

6. The thread trimming and presser foot lifting mechanism of a double-needle sewing machine according to claim 1, characterized in that: When the presser foot is lifted to the highest position, the driver (20) rotates in the reverse direction to return to the starting point, and the presser foot lifting cam (31) also rotates in the reverse direction to release the thrust on the shaft sleeve (42). Under the action of the compression spring of the presser foot lifting mechanism (40), the presser foot is lowered from the highest position to the cloth pressing state.

7. The thread trimming and presser foot lifting mechanism of a double-needle sewing machine according to claim 1, characterized in that: The double thread trimming mechanism (50) comprises a thread trimming slide bar (51), a circular push piece 1 (52), a circular push piece 2 (53), a push rod (54), a thread trimming rocker (55), a thread trimming rotating rod (56), a thread trimming push rod (57), a left thread trimming execution end (58), a right thread trimming execution end (59) and a spring (60); the thread trimming cam (32) driving the double cam (30) is located between the circular push piece 1 (52) and the circular push piece 2 (53) arranged on the thread trimming slide bar (51).

8. The thread trimming and presser foot lifting mechanism of a double-needle sewing machine according to claim 1, characterized in that: When the driver (20) drives the double cam (30) to drive, the thread trimming cam (32) pushes the circular pusher 1 (52) to execute the thread trimming action of the double thread trimming mechanism (50); when the driver (20) drives the double cam (30) to rotate in the opposite direction, the thread trimming cam (32) pushes the circular pusher 2 (53) to execute the resetting of the double thread trimming mechanism (50).

9. The thread trimming and presser foot lifting mechanism of a double-needle sewing machine according to claim 7, characterized in that: The thread trimmer slide bar (51) is movably arranged on the driver (20), the thread trimmer slide bar (51) is connected to a push rod (54), the push rod (54) is hinged to a thread trimmer rocker (55), a thread trimmer rotating rod (56) is fixed to the thread trimmer rocker (55), the thread trimmer rotating rod (56) is indirectly connected to a left thread trimmer execution end (58); a thread trimmer push rod (57) is hinged to the thread trimmer rocker (55), and the thread trimmer push rod (57) is indirectly connected to a right thread trimmer execution end (59).

10. The thread trimming and presser foot lifting mechanism of a double-needle sewing machine according to claim 7, characterized in that: The double thread trimming mechanism (50) also has a spring (60), and a spring (60) is arranged between the thread trimming slide bar (51) and the base plate (11), and the horizontal arrangement direction of the spring (60) is substantially parallel to the thread trimming push rod (57).

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