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

Abstract

The utility model belongs to the technical field of sewing machines. The sewing machine solves the problem that in the prior art, a sewing machine is complex and tedious in structure. The sewing machine comprises a machine shell, a thread trapper assembly and a presser foot lifting assembly, the thread trapper assembly and the presser foot lifting assembly are arranged on the machine shell, and the presser foot lifting assembly comprises a presser foot lifting connecting rod which is connected with a tension spring in a sleeved mode and arranged on the machine shell in a penetrating mode. The driving mechanism comprises a driving motor installed on the machine shell and a rotating shaft rotationally arranged on the machine shell and coaxial with an output shaft of the driving motor, the two ends of the rotating shaft are fixedly connected with a thread loosening crank and a lifting crank respectively, the thread loosening crank is connected with a thread clamping device assembly through a thread loosening connecting rod, and an eccentric roller is connected to the output shaft of the driving motor. When the roller rotates, the roller can push the thread loosening crank to swing so that the lifting crank can drive the presser foot lifting connecting rod to move upwards, and meanwhile the thread clamping device assembly loosens threads. The driving device has the advantages that the driving structure of the splicing machine can be simplified, and the manufacturing cost can be reduced.

Description

TECHNICAL FIELD

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

[0002] The splicing machine is mainly used for splicing and joining of sewing parts, and is suitable for various knitted and woven fabrics. The existing splicing machine comprises a thread clamp assembly and a lifting presser foot assembly. The lifting presser foot assembly comprises a first electromagnet installed at the tail of the machine head, a rotating shaft, a connecting rod and a lifting presser foot arranged in the machine head. The first electromagnet is connected with the lifting presser foot through the rotating shaft, the connecting rod and other components, and the lifting of the lifting presser foot is realized through the first electromagnet. The thread clamp assembly needs to be loosened when releasing the thread, and the existing splicing machine realizes the thread release of the thread clamp assembly through a second electromagnet installed on the machine shell.

[0003] That is, the existing splicing machine needs to set multiple drivers to realize the lifting of the presser foot and the thread release of the thread clamp, which increases the hardware cost. In addition, the setting of multiple drivers and related components occupies a large installation space, making the structure of the splicing machine complex and cumbersome. SUMMARY

[0004] The utility model discloses a drive mechanism of sewing machine thread release and lifting presser foot, and aims at the above problems existing in the prior art.

[0005] The utility model discloses a drive mechanism of sewing machine thread release and lifting presser foot, and aims at the above problems existing in the prior art.

[0006] A drive mechanism of sewing machine thread release and lifting presser foot, the sewing machine comprises a machine shell and a thread clamp assembly and a lifting presser foot assembly arranged on the machine shell respectively. The lifting presser foot assembly comprises a lifting presser foot connecting rod sleeved with a tension spring and arranged on the machine shell. The drive mechanism comprises a driving motor installed on the machine shell and a rotating shaft arranged on the machine shell and coaxial with the output shaft of the driving motor. The two ends of the rotating shaft are fixedly connected with a thread release crank and a lifting crank respectively. The thread release crank is connected with the thread clamp assembly through a thread release connecting rod. The output shaft of the driving motor is connected with an eccentrically arranged roller. The roller is pressed against the thread release crank, and the roller can push the thread release crank to swing when rotating, so that the lifting crank drives the lifting presser foot connecting rod to move upward while the thread clamp assembly releases the thread.

[0007] The driving mechanism for thread loosening and presser foot lifting of the sewing machine is provided with a roller on the output shaft of the driving motor, and the roller can push the thread loosening crank to swing when the roller rotates, so that the lifting crank drives the presser foot connecting rod to move upward while the thread clamp assembly loosens the thread, thereby synchronously realizing the actions of lifting the presser foot and loosening the thread, and only one driving motor can realize the control of thread loosening and presser foot lifting, that is, the single power source is multifunctionally distributed, the redundant components are reduced, the driving structure of the sewing machine is simplified, the number of drivers is reduced, and the manufacturing cost is reduced.

[0008] In addition, the shaft is coaxially arranged with the output shaft of the driving motor, which can avoid the abrasion problem caused by the direct driving of the driving motor, reserve space for the driving mechanism to drive the thread cutting assembly to cut the thread, reduce the friction between the roller and the thread loosening crank, and reduce noise and energy loss.

[0009] Specifically, when the presser foot needs to be lifted after sewing is completed, the driving motor drives the roller to rotate, so that the roller abutting against the thread loosening crank can synchronously drive the thread loosening crank to swing, and then the thread loosening crank drives the shaft to rotate, so that the lifting crank on the shaft drives the presser foot connecting rod and the presser foot thereon to move upward, thereby realizing the lifting action of the presser foot, and at the same time, the thread loosening crank drives the thread clamp assembly to loosen the thread through the thread loosening connecting rod when the thread loosening crank swings, so that only one driving motor can realize the control of thread loosening and presser foot lifting, and finally the driving motor drives the roller to reset, and after the roller is reset, the thread clamp assembly is reset, and under the action of the elastic force of the tension spring, the presser foot connecting rod and the presser foot thereon are reset.

[0010] In the driving mechanism for thread loosening and presser foot lifting of the sewing machine, the output shaft of the driving motor is provided with a fixing frame, the roller is connected to the side wall of the fixing frame facing the shaft, the fixing frame is provided with a sleeve hole, the output shaft of the driving motor is inserted into the sleeve hole, the edge of the sleeve hole is provided with a notch, and the fixing frame is further provided with fastening bolts penetrating through the two sides of the notch, so that the roller and the driving shaft of the driving motor are more convenient to disassemble and assemble.

[0011] In the driving mechanism for thread loosening and presser foot lifting of the sewing machine, the upwardly curved end of the roller and the lifting crank is located on the same side of the shaft, the top end of the presser foot connecting rod is sleeved with a lifting crank, one end of the lifting crank is sleeved on the shaft, and the other end is in an upwardly curved shape and abuts against the lower end surface of the lifting crank, so that the roller can better drive the thread loosening crank to swing, the thread loosening crank can better drive the thread loosening connecting rod to move backward, and the thread loosening crank can better drive the lifting crank to rotate through swinging, and the lifting crank can better drive the presser foot connecting rod to move upward when the lifting crank rotates.

[0012] In the thread loosening and presser foot lifting driving mechanism of the sewing machine, the width of the thread loosening crank facing the side wall of the roller is greater than the thickness of the roller, so that the roller can better drive the thread loosening crank to swing and avoid the disengagement of the two.

[0013] In the thread loosening and presser foot lifting driving mechanism of the sewing machine, the thread tensioner assembly comprises a base frame mounted on the machine shell and a thread loosening rod rotatably arranged horizontally on the base frame, a torsion spring is sleeved on the thread loosening rod, one end of the torsion spring is connected to the thread loosening rod, and the other end of the torsion spring is connected to the base frame, a rotating crank is sleeved on the thread loosening rod, and the rotating crank is connected to the thread loosening connecting rod through a connecting rod. The thread loosening connecting rod drives the connecting rod to move backward, so that the rotating crank drives the thread loosening rod to rotate and the thread tensioner assembly loosens the thread. The torsion spring can reset the rotating crank, the connecting rod and the thread loosening connecting rod through the thread loosening rod. Specifically, under the action of the torsion spring, the thread loosening rod and the rotating crank rotate in the opposite direction, the thread tensioner assembly re-tensions the thread, and the connecting rod moves forward to restore the thread loosening crank to the original position.

[0014] Compared with the prior art, the thread loosening and presser foot lifting driving mechanism of the sewing machine has the following advantages. The thread loosening and presser foot lifting driving mechanism of the sewing machine is provided with a roller on the output shaft of the driving motor. When the roller rotates, it can push the thread loosening crank to swing, so that the lifting crank drives the presser foot connecting rod to move upward and the thread tensioner assembly loosens the thread. The lifting of the presser foot and the loosening of the thread are simultaneously realized, so that the action control of the thread loosening and the presser foot lifting can be realized by only one driving motor, that is, the multifunctional distribution of a single power source is realized, the redundant components are reduced, the driving structure of the sewing machine is simplified, and the number of drivers is reduced, thereby reducing the manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of the thread loosening and presser foot lifting driving mechanism of the sewing machine.

[0016] Figure 2 is a schematic diagram of the thread loosening and presser foot lifting driving mechanism of the sewing machine after removing the machine shell.

[0017] Figure 3 is an exploded view of the thread loosening and presser foot lifting driving mechanism of the sewing machine after removing the machine shell.

[0018] In the figure, 1 is the machine shell, 2 is the thread tensioner assembly, 2a is the base frame, 2b is the thread loosening rod, 2c is the torsion spring, 2d is the rotating crank, 2e is the connecting rod, 3 is the presser foot lifting assembly, 3a is the presser foot connecting rod, 3b is the tension spring, 4 is the presser foot, 5 is the driving motor, 5a is the output shaft, 6 is the fixing frame, 6a is the sleeving hole, 6b is the notch, 6c is the fastening bolt, 7 is the rotating shaft, 8 is the thread loosening crank, 9 is the lifting crank, 10 is the thread loosening connecting rod, 11 is the roller, and 12 is the lifting crank. DETAILED DESCRIPTION

[0019] The utility model discloses the specific embodiment of the utility model below and combining the drawings, the technical scheme of the utility model is further described, but the utility model is not limited to these embodiments.

[0020] A kind of sewing machine thread loosening and lifting presser foot drive mechanism, refer to Figures 1-3 , sewing machine includes casing 1 and the thread clamp assembly 2 and lifting presser foot assembly 3 respectively being arranged on casing 1, the lifting presser foot assembly 3 includes lifting presser foot connecting rod 3a that is sleeved with tension spring 3b and is passed in casing 1, it is characterized in that, the drive motor 5 of the present drive mechanism is installed on the casing 1, and rotationally arranged on casing 1 and with the output shaft 5a of the drive motor 5 coaxial rotation axis 7, the both ends of the rotation axis 7 are fixed with thread loosening crank 8 and lifting crank 9 respectively, the thread loosening crank 8 is connected the thread clamp assembly 2 by thread loosening connecting rod 10, the output shaft 5a of the drive motor 5 is connected with the eccentricity setting idler 11, the idler 11 is pressed on the thread loosening crank 8, and when the idler 11 rotates, thread loosening crank 8 can be pushed to swing to make lifting crank 9 drive the lifting presser foot connecting rod 3a to move upwards while the thread clamp assembly 2 thread loosening.

[0021] Refer to Figure 1 、 Figure 2 And Figure 3 , specifically, the thread clamp assembly 2 includes base frame 2a installed on casing 1 and thread loosening rod 2b rotatably horizontally arranged on base frame 2a, the torsional spring 2c is sleeved on the thread loosening rod 2b, one end of the torsional spring 2c is connected on the thread loosening rod 2b, the other end of the torsional spring 2c is connected on the base frame 2a, the rotation crank 2d is sleeved on the thread loosening rod 2b, and the rotation crank 2d is connected with the thread loosening connecting rod 10 by connecting rod 2e.

[0022] Refer to Figure 1 、 Figure 2 And Figure 3 , more specifically, the output shaft 5a of the drive motor 5 is provided with fixed frame 6, the idler 11 is connected on the side wall of fixed frame 6 facing the rotation axis 7, the fixed frame 6 has sleeve hole 6a, the output shaft 5a of the drive motor 5 is inserted in the sleeve hole 6a, the edge of the sleeve hole 6a has gap 6b, and the fixed frame 6 is also provided with fastening bolt 6c passing through both sides of the gap 6b.

[0023] Refer to Figure 1 、 Figure 2 And Figure 3More specifically, the upwardly curved end of the lifting crank 9 is located on the same side of the rotating shaft 7, the top end of the presser foot connecting rod 3a is sleeved with a lifting crank 12, and one end of the lifting crank 9 is sleeved on the rotating shaft 7, and the other end is in the shape of an upwardly curved arc and abuts against the lower end surface of the lifting crank 12.

[0024] In the embodiment, the width of the thread loosening crank 8 facing the side wall of the roller 11 is greater than the thickness of the roller 11.

[0025] The working principle of the driving mechanism of the thread loosening and presser foot lifting mechanism of the sewing machine is described below:

[0026] When the thread needs to be loosened and the presser foot needs to be lifted after sewing, the driving motor 5 drives the fixed frame 6 to rotate, the roller 11 on the fixed frame 6 drives the thread loosening crank 8 to swing, so that the thread loosening crank 8 drives the thread loosening connecting rod 10 to move backward, the thread loosening connecting rod 10 in turn drives the connecting rod 2e to move backward, and the rotating crank 2d connected with the connecting rod 2e drives the thread loosening rod 2b to rotate to loosen the thread of the thread clamp assembly 2, and at the same time, the thread loosening crank 8 drives the rotating shaft 7 and the lifting crank 9 sleeved on the rotating shaft 7 to rotate synchronously (the rotating shaft 7 is coaxially arranged with the output shaft 5a of the driving motor 5 and has a gap therebetween, so that the output shaft 5a of the driving motor 5 does not directly drive the rotating shaft 7 to rotate), so that the upwardly curved end of the lifting crank 9 acts on the lifting crank 12 to drive the presser foot connecting rod 3a to move upward, to realize the lifting action of the presser foot, and then the driving motor 5 drives the fixed frame 6 to return, under the action of the torsional spring 2c, the thread loosening rod 2b and the rotating crank 2d are reversely rotated, the thread clamp assembly 2 re-achieves the thread clamping function, and at the same time, the connecting rod 2e moves forward to reset, under the elastic force of the tension spring 3b, the presser foot connecting rod 3a and the presser foot 4 thereon move downward to reset, and the lifting crank 9 resets, and at the same time, under the joint action of the connecting rod 2e and the lifting crank 9, the thread loosening crank 8 returns to the original position.

[0027] 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 replace them with similar ways, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A thread loosening and presser foot lifting driving mechanism of a sewing machine, the sewing machine comprising a machine housing (1) and a thread clamping assembly (2) and a presser foot lifting assembly (3) respectively arranged on the machine housing (1), the presser foot lifting assembly (3) comprising a presser foot connecting rod (3a) sleeved with a tension spring (3b) and penetrating through the machine housing (1), characterized in that, The driving mechanism comprises a driving motor (5) mounted on the casing (1) and a rotating shaft (7) coaxially arranged on the casing (1) and coaxial with the output shaft (5a) of the driving motor (5), the rotating shaft (7) has a line loosening crank (8) and a lifting crank (9) fixedly connected to two ends thereof, the line loosening crank (8) is connected with the thread holder assembly (2) through a line loosening connecting rod (10), the output shaft (5a) of the driving motor (5) is connected with an eccentrically arranged roller (11), the roller (11) is pressed against the line loosening crank (8), and the roller (11) can push the line loosening crank (8) to swing when rotating so as to drive the lifting crank (9) to move upward and simultaneously loosen the thread of the thread holder assembly (2).

2. The thread trimming and presser foot lifting drive mechanism according to claim 1, characterized in that The output shaft (5a) of the driving motor (5) is provided with a fixing frame (6), the roller (11) is connected to the side wall of the fixing frame (6) facing the rotating shaft (7), the fixing frame (6) has a sleeving hole (6a), the output shaft (5a) of the driving motor (5) is inserted into the sleeving hole (6a), the edge of the sleeving hole (6a) has a notch (6b), and the fixing frame (6) is further provided with a fastening bolt (6c) penetrating through both sides of the notch (6b).

3. The thread trimming and presser foot lifting drive mechanism according to claim 1, wherein The upwardly curved end of the roller (11) and the lifting crank (9) is located on the same side of the rotating shaft (7), the top end of the pressing foot connecting rod (3a) is sleeved with a lifting crank (12), one end of the lifting crank (9) is sleeved on the rotating shaft (7), and the other end thereof is in an upwardly curved arc shape and abuts against the lower end face of the lifting crank (12).

4. The thread trimming and presser foot lifting mechanism according to claim 1 or 2 or 3, wherein The width of the side wall of the line loosening crank (8) facing the roller (11) is greater than the thickness of the roller (11).

5. The thread trimming and presser foot lifting mechanism according to claim 1 or 2 or 3, wherein The thread holder assembly (2) comprises a base frame (2a) mounted on the casing (1) and a line loosening rod (2b) rotatably and horizontally arranged on the base frame (2a), the line loosening rod (2b) is sleeved with a torsion spring (2c), one end of the torsion spring (2c) is connected to the line loosening rod (2b), the other end of the torsion spring (2c) is connected to the base frame (2a), the line loosening rod (2b) is sleeved with a rotating crank (2d), and the rotating crank (2d) is connected with the line loosening connecting rod (10) through a connecting rod (2e).

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