Driving mechanism for presser foot lifting and thread trimming of sewing machine

Abstract

The utility model provides a driving mechanism for presser foot lifting and thread trimming of a sewing machine, and belongs to the technical field of sewing machines. The problem that two drivers are needed for presser foot lifting and thread trimming in the prior art is solved. The driving mechanism comprises a double-head motor, a lifting and pressing cam fixedly connected to one end of an output shaft of the double-head motor, a thread trimming cam fixedly connected to the other end of the output shaft of the double-head motor, a lifting and pressing swing rod, a lifting and pressing ejector rod, a thread trimming swing rod and a thread trimming pull rod, one end of the lifting and pressing swing rod is hinged to the machine body, and the other end of the lifting and pressing swing rod is connected with the presser foot lifting mechanism through the lifting and pressing ejector rod. The other end of the lifting and pressing swing rod is further provided with a pin roller, the pin roller abuts against the peripheral wall of the lifting and pressing cam, a concave cam groove is formed in the outer side of the thread trimming cam, one end of the thread trimming swing rod is hinged to the machine body, the other end of the thread trimming swing rod is connected with the thread trimming mechanism through a thread trimming pull rod, and a rolling sleeve is arranged on the thread trimming pull rod and embedded into the cam groove. The driving mechanism for lifting the presser foot and trimming the thread of the sewing machine has the advantages of compact structure and low cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewing machine technical field relates to a sewing machine drive mechanism of lifting presser foot and thread trimming. BACKGROUND

[0002] Sewing machine is with one or more sewing thread, on the seam material forms one or more stitch, makes one or or more layers of seam interlaced or sewn together machine. Sewing machine includes lifting presser foot mechanism and thread trimming mechanism, and lifting presser foot mechanism and thread trimming mechanism need to be driven by drive mechanism.

[0003] The existing drive mechanism for driving lifting presser foot mechanism and thread trimming mechanism work, for example, Chinese patent literature data disclosed the sewing machine with built-in automatic thread trimming mechanism and lifting presser foot mechanism [patent number: 201610245514.2;Application publication number: CN105696206B], it includes the head of sewing machine, the inner cavity of head is fixed with two linear drives simultaneously, respectively first linear drive and second linear drive;First linear drive is fixedly connected with the head through first linear drive mounting seat, and first linear drive can drive thread trimming cutter group work to realize thread trimming;Second linear drive is fixedly connected with the head through second linear drive mounting seat, and second linear drive can drive lifting presser foot mechanism to realize lifting and lowering presser foot.

[0004] The sewing machine of this structure realizes thread trimming by one linear drive push-pull driving thread trimming cutter group, and realizes lifting presser foot by another linear drive push-pull driving lifting presser foot crank, that is, realizes thread trimming and lifting presser foot by two linear drives, and the price of linear drive is higher, resulting in higher cost. SUMMARY

[0005] The utility model discloses a kind of drive mechanisms of lifting presser foot and thread trimming of sewing machine, and the technical problem solved is how to make drive mechanism compact structure, reduce the cost of drive mechanism.

[0006] The utility model discloses a sewing machine lift the drive mechanism of presser foot and thread trimming, and the sewing machine includes lift the presser foot mechanism and thread trimming mechanism, it is characterized in that, drive mechanism includes the double -end motor of fixed on the sewing machine body, the lift press cam of fixed in double -end motor output shaft one end, the thread trimming cam of fixed in double -end motor output shaft the other end, lift the swing lever of presser foot, lift the top rod of presser foot, thread trimming swing lever and thread trimming pull rod, one end of lift the swing lever of presser foot is articulated with the body, and the other end is connected with the presser foot mechanism through lift the top rod of presser foot, and the other end of lift the swing lever of presser foot still is equipped with the roller, and the roller is supported on the outer wall of lift the press cam, and the outer side of thread trimming cam has the cam groove recessed arrangement, one end of thread trimming swing lever is articulated with the body, and the other end is connected with the thread trimming mechanism through thread trimming pull rod, and the roll sleeve is equipped on thread trimming pull rod, and the roll sleeve is embedded in the cam groove.

[0007] When working, the output shaft of double -end motor rotates, and the output shaft drives lift press cam and thread trimming cam to rotate simultaneously, and the roller moves along the outer wall of lift press cam, and lift press cam is eccentric, and lift press cam drives lift the swing lever of presser foot to rotate around the body through the roller, to make lift the top rod of presser foot move, and lift the top rod of presser foot moves and drives the presser foot mechanism to work, realizes the lifting and lowering of lift the presser foot, and simultaneously in the above process, the roll sleeve moves along the cam groove, and the cam groove is eccentric, and thread trimming cam drives thread trimming swing lever to rotate around the body through the roll sleeve and makes thread trimming pull rod move, and thread trimming pull rod moves and drives the thread trimming mechanism to work, realizes thread trimming cutter thread trimming.This drive mechanism changes the stroke through the setting of lift press cam and drives the presser foot mechanism to work, changes the stroke through the setting of thread trimming cam and drives the thread trimming mechanism to work, and the arrangement is reasonable, so that the drive mechanism is compact.In addition, the drive mechanism can save a motor and reduce the cost through one double -end motor to drive the presser foot mechanism and the thread trimming mechanism to work.

[0008] In the drive mechanism of the presser foot and thread trimming of the sewing machine, the lift the swing lever of presser foot is strip-shaped, and one end of the swing lever is articulated with the body and has a protruding reinforcing part.The reinforcing part enhances the strength, so that the articulated part of the swing lever has sufficient strength and improves the service life.

[0009] In the drive mechanism of the presser foot and thread trimming of the sewing machine, the lift the top rod of presser foot is bent, and the two ends of the top rod are parallel.The space is reasonably utilized, so that the arrangement of the drive mechanism is more reasonable and compact.

[0010] In the drive mechanism of the presser foot and thread trimming of the sewing machine, the roller is articulated with the swing lever of presser foot through a screw.This structure is convenient to connect.

[0011] In the sewing machine lifting presser foot and thread trimming driving mechanism, the lifting presser foot mechanism comprises a manipulating bent rod and a manipulating top column, one end of the manipulating bent rod is hinged with the lifting presser top rod, and the other end is hinged with one end of the manipulating top column. The structure makes the arrangement of the lifting presser foot mechanism reasonable.

[0012] In the sewing machine lifting presser foot and thread trimming driving mechanism, the thread trimming swing rod is in Z shape, one end of the thread trimming swing rod is located beside the circumference of the thread trimming cam, and the other end is located outside the thread trimming cam. The structure makes the arrangement of the thread trimming swing rod reasonable, reasonably utilizes the space, and makes the driving structure compact.

[0013] In the sewing machine lifting presser foot and thread trimming driving mechanism, one end of the thread trimming pull rod is arranged close to the outside of the thread trimming cam. The structure reasonably utilizes the space, and makes the driving structure compact.

[0014] In the sewing machine lifting presser foot and thread trimming driving mechanism, one end of the thread trimming pull rod is provided with a protruding rolling part, and the rolling sleeve is hinged with the rolling part through a screw. The structure reasonably utilizes the principle of lever, and makes the driving mechanism have sufficient thrust to push the thread trimming mechanism to work.

[0015] In the sewing machine lifting presser foot and thread trimming driving mechanism, the thread trimming pull rod is in a bent shape, and the two ends of the thread trimming pull rod are parallel. The structure reasonably utilizes the space, and makes the arrangement of the driving mechanism more reasonable and compact.

[0016] In the sewing machine lifting presser foot and thread trimming driving mechanism, the thread trimming mechanism comprises a thread trimming crank, and the other end of the thread trimming pull rod is hinged with the thread trimming crank. The structure makes the arrangement of the lifting presser foot mechanism reasonable.

[0017] Compared with the prior art, the sewing machine lifting presser foot and thread trimming driving mechanism has the following advantages:

[0018] 1. The driving mechanism drives the lifting presser foot mechanism and the thread trimming mechanism to work through a double-head motor, so that one motor can be saved, and the cost can be reduced.

[0019] 2. The shapes of the lifting presser top rod, the thread trimming swing rod and the thread trimming pull rod and the arrangement of various parts make the driving mechanism reasonably utilize the space, be reasonably arranged and compact in structure.

[0020] 3. The driving mechanism is low in sound, the lifting presser foot height can be adjusted by numbers, the lifting presser foot keeps for a longer time, the thread trimming can be adjusted by numbers, and the thread trimming is forcibly reset through the double-head motor and the thread trimming cam. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the structure diagram of the lifting and pressing part of the driving mechanism.

[0022] Figure 2 is the structure diagram of the thread cutting part of the driving mechanism.

[0023] Figure 3 is the overall structure explosion diagram of the driving mechanism.

[0024] In the figure, 1, lifting and pressing foot mechanism; 1a, operating bent rod; 1b, operating top column; 2, thread cutting mechanism; 2a, thread cutting crank; 3, double-head motor; 31, output shaft; 4, lifting and pressing cam; 5, thread cutting cam; 51, cam groove; 6, lifting and pressing swing rod; 61, reinforcing part; 7, lifting and pressing top rod; 8, thread cutting swing rod; 9, thread cutting pull rod; 91, rolling part; 10, roller; 11, rolling sleeve. DETAILED DESCRIPTION

[0025] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0026] As shown in Figure 1 , Figure 2 , Figure 3 , the sewing machine comprises a lifting and pressing foot mechanism 1, a thread cutting mechanism 2 and a driving mechanism, the driving mechanism is used for driving the lifting and pressing foot mechanism 1 and the thread cutting mechanism 2 to work. The driving mechanism comprises a double-head motor 3, a lifting and pressing cam 4, a thread cutting cam 5, a lifting and pressing swing rod 6, a lifting and pressing top rod 7, a thread cutting swing rod 8, a thread cutting pull rod 9, a roller 10 and a rolling sleeve 11. The lifting and pressing foot mechanism 1 comprises an operating bent rod 1a and an operating top column 1b, and the thread cutting mechanism 2 comprises a thread cutting crank 2a.

[0027] The double-head motor 3 is fixed on the body of the sewing machine, the body is not shown in the figure, and the two ends of the output shaft 31 of the double-head motor 3 are located outside the two ends of the shell of the double-head motor 3. The lifting and pressing cam 4 is fixedly connected to one end of the output shaft 31 of the double-head motor 3, the thread cutting cam 5 is fixedly connected to the other end of the output shaft 31 of the double-head motor 3, and the outer side of the thread cutting cam 5 is provided with a concave cam groove 51.

[0028] The lifting and pressing swing rod 6 is in a strip shape, one end of the lifting and pressing swing rod 6 is hinged to the body, and the end of the lifting and pressing swing rod 6 hinged to the body is provided with a protruding reinforcing part 61. The other end of the lifting and pressing swing rod 6 is hinged to the roller 10 through a screw, and the roller 10 abuts against the outer peripheral wall of the lifting and pressing cam 4. The lifting and pressing top rod 7 is in a bent shape, the two ends of the lifting and pressing top rod 7 are parallel, one end of the lifting and pressing top rod 7 is hinged to the other end of the lifting and pressing swing rod 6, and the other end of the lifting and pressing top rod 7 is hinged to one end of the operating bent rod 1a. The other end of the operating bent rod 1a is hinged to one end of the operating top column 1b.

[0029] One end of the cutting line swing lever 8 is hinged to the machine body, and the other end is hinged to one end of the cutting line pull lever 9, and the other end of the cutting line pull lever 9 is hinged to the cutting line crank 2a. The cutting line swing lever 8 is Z-shaped, one end of the cutting line swing lever 8 is located beside the cutting line cam 5, and the other end is located outside the cutting line cam 5, the cutting line pull lever 9 is bent, the two ends of the cutting line pull lever 9 are parallel, and one end of the cutting line pull lever 9 is arranged beside the cutting line cam 5. One end of the cutting line pull lever 9 has a protruding rolling part 91, and the rolling sleeve 11 is hinged to the rolling part 91 by a screw, and the rolling sleeve 11 is embedded in the cam groove 51.

[0030] In operation, the output shaft 31 of the double-head motor 3 rotates, the output shaft 31 drives the lifting and pressing cam 4 and the cutting line cam 5 to rotate at the same time, the lifting and pressing cam 4 drives the lifting and pressing swing lever 6 to rotate around the machine body through the rolling column 10, the rotation of the lifting and pressing swing lever 6 drives the lifting and pressing top rod 7 to move, the lifting and pressing top rod 7 moves to drive the operating top column 1b to rotate through the operating bent lever 1a, and the lifting and pressing foot is lifted and lowered; at the same time in the above process, the cutting line cam 5 drives the cutting line swing lever 8 to rotate around the machine body through the rolling sleeve 11 to make the cutting line pull lever 9 move, the cutting line pull lever 9 moves to drive the cutting line crank 2a to move, and the cutting line knife cuts the line.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0032] Although the terms such as lifting and pressing foot mechanism 1, operating bent lever 1a, operating top column 1b, cutting line mechanism 2, cutting line crank 2a, double-head motor 3, output shaft 31, lifting and pressing cam 4, cutting line cam 5, cam groove 51, lifting and pressing swing lever 6, reinforcing part 61, lifting and pressing top rod 7, cutting line swing lever 8, cutting line pull lever 9, rolling part 91, rolling column 10, rolling sleeve 11, etc. are used more in this paper, but the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the present application; any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. A drive mechanism for a presser foot lifting and thread trimming mechanism of a sewing machine, the sewing machine comprising a presser foot lifting mechanism (1) and a thread trimming mechanism (2), characterized in that, The driving mechanism comprises a double-head motor (3) fixed on the sewing machine body, a presser lifting cam (4) fixed on one end of an output shaft (31) of the double-head motor (3), a thread cutting cam (5) fixed on the other end of the output shaft (31) of the double-head motor (3), a presser lifting swing rod (6), a presser lifting top rod (7), a thread cutting swing rod (8) and a thread cutting pull rod (9), one end of the presser lifting swing rod (6) is hinged to the body, the other end is connected to the presser foot mechanism (1) through the presser lifting top rod (7), the other end of the presser lifting swing rod (6) is also provided with a roller (10) abutting against the outer wall of the presser lifting cam (4), the outer side of the thread cutting cam (5) is provided with a concave cam groove (51), one end of the thread cutting swing rod (8) is hinged to the body, the other end is connected to the thread cutting mechanism (2) through the thread cutting pull rod (9), the thread cutting pull rod (9) is provided with a rolling sleeve (11) embedded in the cam groove (51).

2. A presser foot lifting and thread trimming drive mechanism for a sewing machine according to claim 1, wherein The presser lifting swing rod (6) is in a strip shape, and the end of the presser lifting swing rod (6) hinged to the body is provided with a protruding reinforcing part (61).

3. The presser foot lifting and thread trimming drive mechanism according to claim 1, wherein, The presser lifting top rod (7) is in a bent shape, and the two ends of the presser lifting top rod (7) are parallel.

4. A presser foot lifting and thread trimming drive mechanism in accordance with claim 1 or 2 or 3, characterized in that, The roller (10) is hinged to the presser lifting swing rod (6) through a screw.

5. A presser foot lifting and thread trimming drive mechanism in accordance with claim 1 or 2 or 3 wherein, The presser foot mechanism (1) comprises a control bending rod (1a) and a control top rod (1b), one end of the control bending rod (1a) is hinged to the presser lifting top rod (7), and the other end is hinged to one end of the control top rod (1b).

6. A presser foot lifting and thread trimming drive mechanism in accordance with claim 1 or 2 or 3 wherein, The thread cutting swing rod (8) is in a Z shape, one end of the thread cutting swing rod (8) is located beside the thread cutting cam (5) in a circumferential direction, and the other end is located outside the thread cutting cam (5).

7. A presser foot and thread trimming drive mechanism for a sewing machine as claimed in claim 1 or 2 or 3, wherein, One end of the thread cutting pull rod (9) is arranged close to the outside of the thread cutting cam (5).

8. A presser foot lifting and thread trimming drive mechanism in accordance with claim 1 or 2 or 3 wherein, One end of the thread cutting pull rod (9) is provided with a protruding rolling part (91), and the rolling sleeve (11) is hinged to the rolling part (91) through a screw.

9. A presser foot and thread trimming drive mechanism for a sewing machine as claimed in claim 1 or 2 or 3, wherein, The thread cutting pull rod (9) is in a bent shape, and the two ends of the thread cutting pull rod (9) are parallel.

10. A presser foot lifting and thread trimming drive mechanism for a sewing machine as claimed in claim 1 or 2 or 3, wherein, The thread cutting mechanism (2) comprises a thread cutting crank (2a), and the other end of the thread cutting pull rod (9) is hinged to the thread cutting crank (2a).

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