Thread trimming mechanism of sewing machine

Abstract

The thread trimming mechanism is characterized in that a stepping motor is provided with a motor rotating shaft with power output, a thread trimming cutter return crank is fixed to the motor rotating shaft, the motor rotating shaft is sleeved with a thread trimming transmission crank, the lower end of a thread trimming connecting rod is hinged to the thread trimming crank, the thread trimming crank is fixed to a thread trimming rotating shaft, and the thread trimming rotating shaft is connected with a thread trimming execution end; when the sewing machine needs to execute thread trimming, the stepping motor and the thread trimming cutter return rod are driven to press the thread trimming action part downwards, so that the thread trimming crank and the thread trimming rotating shaft rotate to achieve the thread trimming action of the thread trimming execution end. When the stepping motor starts to drive reversely, the thread trimming cutter return rod lifts the cutter return acting part, the thread trimming crank and the thread trimming rotating shaft rotate reversely to achieve the forced cutter return action of the thread trimming executing end, the thread trimming mechanism has the function of forced cutter return reset, forced cutter return is executed in each reset, and the thread trimming mechanism has high practical value.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field, specifically put forward a kind of sewing machine's thread trimming mechanism. BACKGROUND

[0002] In actual sewing process, due to the fault of sewing machine, nest will appear on the material, and the nest is too large to cause the thread trimming mechanism to be stuck when trimming thread, and the parts of thread trimming mechanism are difficult to reset, the return knife is blocked, manual repair is needed, the thread end is cleaned, and the normal function of thread trimming mechanism is restored.

[0003] The utility model discloses a kind of thread trimming mechanism and shuttle oil supply device of zigzag sewing machine, including the cutter assembly being set on the base of sewing machine, the cutter assembly includes cutter frame, the cutter with hook-shaped end being rotationally arranged on cutter frame and the fixed cutter being set on the base of sewing machine, the cutter frame is connected with pull rod, pull rod is connected with pusher by connecting rod, the pull rod is connected with reset component capable of driving it to reset, the base of sewing machine is provided with shuttle shaft, cutter frame rolling gear is rotationally arranged on the shuttle shaft, cutter frame rolling gear is engaged with bevel gear being set on lower shaft, the cutter frame is set on cutter frame rolling gear by one-piece tight fit bearing, the cutter is cooperated with fixed cutter to form thread trimming movement under the driving of cutter frame, the thread trimming mechanism of the above-mentioned scheme needs manual repair in the case where it is difficult to reset due to being stuck, it is relatively inconvenient. UTILITY MODEL CONTENTS

[0004] The present application is aimed at the defects that the above-mentioned thread trimming mechanism is stuck and difficult to reset, and a kind of thread trimming mechanism of sewing machine is provided, characterized in that, including step motor, thread trimming return knife crank, thread trimming connecting rod, thread trimming transmission crank, thread trimming crank, thread trimming shaft and thread trimming execution end, the step motor has motor shaft of power output, the thread trimming return knife crank is fixed on motor shaft, the thread trimming transmission crank is sleeved on motor shaft, the lower end of thread trimming connecting rod is hinged with thread trimming crank, thread trimming crank is fixed on thread trimming shaft, thread trimming shaft connects thread trimming execution end, the thread trimming connecting rod is hinged with thread trimming transmission crank;The upper end of thread trimming connecting rod has thread trimming action part and return knife action part, thread trimming return knife crank has thread trimming return knife rod, when sewing machine is executed thread trimming, drive step motor, the thread trimming return knife rod presses down thread trimming action part, so that thread trimming crank and thread trimming shaft rotate to realize the thread trimming action of thread trimming execution end;When step motor starts reverse drive, the thread trimming return knife rod lifts return knife action part, so that thread trimming crank and thread trimming shaft reverse to realize the forced return knife action of thread trimming execution end, to solve the problem that the above-mentioned thread trimming mechanism is stuck.

[0005] Further, the thread trimming return knife rod is between thread trimming action part and return knife action part.

[0006] Furthermore, the stepper motor is fixed to the side of the sewing machine body, and the thread cutting drive crank is located on the outside of the thread cutting return crank, which is fixed on the motor shaft near the stepper motor.

[0007] Furthermore, the wire-cutting return bar is linked to the wire-cutting connecting rod via the wire-cutting action part or the return bar action part.

[0008] The advantages of this application are that the wire cutting mechanism has the function of forced retraction and reset, and forced retraction is performed in each reset, which has high practical value. At the same time, it has the advantage of simple structure and low manufacturing difficulty. Attached Figure Description

[0009] Fig. 1 This is a three-dimensional structural diagram of the thread-cutting mechanism of a sewing machine according to this application;

[0010] Fig. 2 This is a schematic diagram of the thread-cutting mechanism of a sewing machine according to this application;

[0011] Fig. 3 This is a view of the components of the wire cutting mechanism of this application, including the wire cutting connecting rod, the wire cutting transmission crank, and the shaft wire cutting return crank.

[0012] exist Figs. 1-3 In the middle: Stepper motor 1, motor shaft 11, wire cutting return crank 2, wire cutting return rod 21, wire cutting connecting rod 3, wire cutting action part 31, return action part 32, wire cutting transmission crank 4, wire cutting crank 5, wire cutting shaft 6, wire cutting execution end 7. Detailed Implementation

[0013] The following is in conjunction with the appendix Figs. 1-3 The preferred embodiments of this application are described in detail so that the advantages and features of this application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of this application. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0014] See the above. Figs. 1-3 This application discloses a thread-cutting mechanism for a sewing machine, which includes components such as a stepper motor 1, a thread-cutting and return crank 2, a thread-cutting connecting rod 3, a thread-cutting transmission crank 4, a thread-cutting crank 5, a thread-cutting rotating shaft 6, and a thread-cutting execution end 7. The thread-cutting mechanism of the sewing machine performs thread-cutting and return actions. The thread-cutting mechanism is driven by the stepper motor 1 to complete the above-mentioned thread-cutting and return actions.

[0015] The step motor 1 is fixed on the side body of the sewing machine, and has a motor shaft 11 for power output. The motor shaft 11 is provided with a thread cutting return crank 2 and a thread cutting transmission crank 4. The thread cutting return crank 2 is fixed on the motor shaft 11, and the thread cutting transmission crank 4 is sleeved on the motor shaft 11 and can rotate freely on the motor shaft 11. The thread cutting transmission crank 4 is located outside the thread cutting return crank 2, and the thread cutting return crank 2 is fixed on the motor shaft 11 and located close to the step motor 1.

[0016] The lower end of the thread cutting connecting rod 3 is hinged to the thread cutting crank 5, the thread cutting crank 5 is fixed on a thread cutting shaft 6, and the thread cutting shaft 6 is connected to a thread cutting execution end 7 for executing a thread cutting scheme. When the thread cutting connecting rod 3 moves up and down, the thread cutting crank 5 and the thread cutting shaft 6 rotate by a certain angle, so that the thread cutting execution end 7 can realize the thread cutting or return action of the sewing machine.

[0017] The upper end of the thread cutting connecting rod 3 has a thread cutting action part 31 and a return action part 32, and the thread cutting return crank 2 has a thread cutting return rod 21 located between the thread cutting action part 31 and the return action part 32. Under the driving of the step motor 1, the thread cutting return crank 2 rotates, and the thread cutting return rod 21 drives the thread cutting connecting rod 3 through the thread cutting action part 31 or the return action part 32.

[0018] The thread cutting connecting rod 3 is hinged to the thread cutting transmission crank 4, so that when the thread cutting connecting rod 3 moves up and down, the thread cutting transmission crank 4 also rotates on the motor shaft 11.

[0019] When the sewing machine needs to execute thread cutting, the step motor 1 is driven, so that the thread cutting return rod 21 of the thread cutting return crank 2 presses the thread cutting action part 31 of the thread cutting connecting rod 3, pushes the thread cutting connecting rod 3 to move downward, makes the thread cutting crank 5 and the thread cutting shaft 6 rotate to realize the thread cutting action of the thread cutting execution end 7, and also makes the thread cutting transmission crank 4 rotate downward around the motor shaft 11.

[0020] When the thread cutting mechanism needs to return, the step motor 1 is reversely driven, and under the joint action of the reset spring originally provided in the thread cutting mechanism, the thread cutting return rod 21 of the thread cutting return crank 2 lifts the return action part 32 of the thread cutting connecting rod 3, drives the thread cutting connecting rod 3, the thread cutting crank 5 and the thread cutting shaft 6 to reset, and the thread cutting crank 5 and the thread cutting shaft 6 are reversely rotated, so as to realize the forced return action of the thread cutting execution end 7. During this period, the thread cutting transmission crank 4 also rotates upward around the motor shaft 11. The scheme of the present application adopts a forced return scheme, which is used whether the thread cutting mechanism has a jamming phenomenon or not. Once the thread cutting mechanism has a jamming fault, it is forced to return, which effectively overcomes the technical difficulty that the existing technology cannot execute forced return. The scheme of the present application has high practical value.

[0021] The above merely provides one of the preferred embodiments of the present application, and is not intended to limit the present application, and is not intended to limit the patent protection scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which utilizes the shape, structure, principle of the contents of the present application, or any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application, are all included in the patent protection scope of the present application.

Claims

1. A thread trimming mechanism of a sewing machine, characterized by comprising: The application relates to a sewing machine thread cutting device, which comprises a step motor (1), a thread cutting return crank (2), a thread cutting connecting rod (3), a thread cutting transmission crank (4), a thread cutting crank (5), a thread cutting rotating shaft (6) and a thread cutting execution end (7), the step motor (1) has a motor rotating shaft (11) with power output, the thread cutting return crank (2) is fixed on the motor rotating shaft (11), the thread cutting transmission crank (4) is sleeved on the motor rotating shaft (11), the lower end of the thread cutting connecting rod (3) is hinged with the thread cutting crank (5), the thread cutting crank (5) is fixed on the thread cutting rotating shaft (6), the thread cutting rotating shaft (6) is connected with the thread cutting execution end (7), and the thread cutting connecting rod (3) is hinged with the thread cutting transmission crank (4). The upper end of the thread cutting connecting rod (3) is provided with a thread cutting action part (31) and a return action part (32), the thread cutting return crank (2) is provided with a thread cutting return rod (21), when the sewing machine needs to execute thread cutting, the step motor (1) is driven, the thread cutting return rod (21) presses down the thread cutting action part (31), so that the thread cutting crank (5) and the thread cutting rotating shaft (6) rotate to realize the thread cutting action of the thread cutting execution end (7); when the step motor (1) is reversely driven, the thread cutting return rod (21) lifts up the return action part (32), so that the thread cutting crank (5) and the thread cutting rotating shaft (6) are reversely rotated to realize the forced return action of the thread cutting execution end (7).

2. The thread trimming mechanism of a sewing machine according to claim 1, wherein The thread cutting return rod (21) is located between the thread cutting action part (31) and the return action part (32).

3. The thread trimming mechanism of claim 1 wherein, The step motor (1) is fixed on the side body of the sewing machine, the thread cutting transmission crank (4) is located on the outer side of the thread cutting return crank (2), the thread cutting return crank (2) is fixed on the motor rotating shaft (11) and close to one side of the step motor (1).

4. The thread trimming mechanism of claim 1 wherein, The thread cutting return rod (21) links the thread cutting connecting rod (3) through the thread cutting action part (31) or the return action part (32).

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