Transmission mechanism of thread trimming mechanism of button sewing machine

Abstract

The utility model relates to a transmission mechanism of a button sewing machine thread trimming mechanism, which comprises a machine head and a base, one end of the machine head is connected with the base through a connecting seat, a thread trimming motor is arranged on the back of the connecting seat close to the top along the horizontal direction, and the thread trimming motor is electrically connected with an electric controller of a button sewing machine. An output shaft of the thread trimming motor is arranged at one end close to the button sewing mechanism, a swing arm perpendicular to the output shaft is fixedly connected to the output shaft, the free end of the swing arm extends towards the side away from the back face, and a transition hole penetrating through the machine head and the base is formed in the position, corresponding to the free end of the swing arm, of the machine head from top to bottom. The free end of the swing arm is movably connected with the upper end of a longitudinal driving rod, and the longitudinal driving rod downwards penetrates through the transition hole to be movably connected with a thread trimming mechanism in the base. The transmission mechanism is greatly simplified, and the structure is more reasonable and compact.

Description

Technical Field

[0001] The utility model relates to sewing machine technology, in particular to a transmission mechanism of a thread trimming mechanism of a button sewing machine. Background Art

[0002] At present, most industrial sewing machines have an automatic thread trimming function, and the automatic thread trimming mechanism is generally arranged on a base below the table. However, due to the small space under the table of the button sewing machine, it is impossible to install an independent thread trimming mechanism. Therefore, the shearing mechanism is driven by an external drive mechanism. The current common practice is to install the thread trimming motor below the main motor at the end of the sewing machine, and then the thread trimming motor drives a thread trimming spindle running through the base to achieve automatic thread trimming. The thread trimming drive is located below the main motor, which limits the expansion of the main motor function. The thread trimming spindle running through the base is long, which is costly and inconvenient to assemble.

[0003] To this end, the applicant designed an automatic thread trimming mechanism for a button sewing machine, comprising a machine head and a base, one end of the machine head being connected to the base via a connecting seat, a thread trimming motor being provided at a position near the top on the back of the connecting seat, the thread trimming motor being electrically connected to the electronic control of the button sewing machine, a transmission cavity being provided below the thread trimming motor on the back of the connecting seat, a horizontally arranged upper transmission lever being pivotally connected in the transmission cavity, the rear end of the upper transmission lever being movably connected to the output end of the thread trimming motor above via an upper connecting rod, the rear end of the upper transmission lever being movably connected to a lower connecting rod, the lower connecting rod passing through the inside of the base, and the pivot in the base It is connected to a lower transmission lever, and the lower connecting rod is movably connected to the rear end of the lower transmission lever. A thread trimming spindle is pivotally connected to the inside of the base. An input arm is provided on the thread trimming spindle, and the input arm cooperates with the front end of the lower transmission lever. A movable knife is provided at the front end of the thread trimming spindle, and the movable knife cooperates with the fixed knife. The thread trimming mechanism is driven by an external stepper motor, and the stepper motor is installed on the back of the machine head connecting seat near the top. This position will not infringe on the worker's operating space. The transmission mechanism partially utilizes the internal space of the connecting seat, and the other part utilizes the base space. It has the characteristics of reasonable structure and stable operation.

[0004] The above structure is pivotally connected to a horizontally arranged upper transmission lever in the transmission cavity. The rear end of the upper transmission lever is movably connected to the output end of the upper thread trimming motor through an upper connecting rod, and the front end of the upper transmission lever is movably connected to the lower connecting rod. Therefore, the transmission mechanism structure through the upper transmission lever still appears a bit complicated. Utility Model Content

[0005] The purpose of the utility model is to provide a transmission mechanism of the thread trimming mechanism of a button sewing machine, which is driven by an external stepper motor. The stepper motor is installed on the back of the machine head connecting seat near the top. The output shaft driven by the stepper motor directly passes through the transfer hole inside the machine head through the swing arm and the longitudinal drive rod to be connected to the thread trimming mechanism in the base. The utility model greatly simplifies the transmission mechanism and has a more reasonable and compact structure.

[0006] To achieve the above objectives, the following technical solutions are adopted:

[0007] A transmission mechanism of a thread trimming mechanism of a button sewing machine comprises a machine head and a base, one end of the machine head is connected to the base via a connecting seat, a thread trimming motor is arranged horizontally on the back side of the connecting seat near the top, and the thread trimming motor is electrically connected to the electronic control of the button sewing machine, and is characterized in that: the output shaft of the thread trimming motor is arranged at one end near the button sewing mechanism, a swing arm is fixedly connected to the output shaft and is perpendicular to the output shaft, the free end of the swing arm extends toward the upper side of the machine head, and a transfer hole is opened from top to bottom at the position of the machine head corresponding to the free end of the swing arm, which passes through the machine head and the base, the free end of the swing arm is movably connected to the upper end of the longitudinal drive rod, and the longitudinal drive rod passes downward through the transfer hole and is movably connected to the thread trimming mechanism inside the base.

[0008] The thread trimming mechanism includes a thread trimming spindle pivotally connected to the inside of the base, an input arm is provided on the thread trimming spindle, the input arm cooperates with the front end of the lower transmission lever, a movable knife is provided at the front end of the thread trimming spindle, the movable knife cooperates with the fixed knife, and the rear end of the lower transmission lever is connected to the lower end of the longitudinal drive rod.

[0009] Compared with the prior art, the utility model eliminates components such as the transmission cavity, the upper transmission lever and the upper connecting rod, simplifies the transmission mechanism, and can directly transmit the driving force of the stepping motor to the thread trimming mechanism inside the base, making the transmission mechanism structure more reasonable and compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the utility model;

[0011] Figure 2 It is a schematic diagram of the bottom structure of the utility model. DETAILED DESCRIPTION

[0012] like Figure 1 、 2 As shown, a transmission mechanism of the thread trimming mechanism of a button sewing machine includes a machine head 1 and a base 2. One end of the machine head 1 is connected to the base 2 through a connecting seat 3. A thread trimming motor 4 is arranged in the horizontal direction on the back side of the connecting seat 3 near the top. The thread trimming motor 4 is electrically connected to the electronic control of the button sewing machine. The output shaft of the thread trimming motor 4 is arranged at one end near the button sewing mechanism 7. A swing arm 5 perpendicular to the output shaft is fixedly connected to the output shaft. The free end of the swing arm 5 extends toward the upper side of the machine head 1. A transfer hole 11 that passes through the machine head 1 and the base 2 is opened from top to bottom at a position of the machine head 1 corresponding to the free end of the swing arm 5. The free end of the swing arm 5 is movably connected to the upper end of the longitudinal drive rod 6, and the longitudinal drive rod 6 passes downward through the transfer hole 11 and is movably connected to the thread trimming mechanism inside the base 2.

[0013] The thread trimming mechanism includes a thread trimming spindle 21 pivotally connected to the inside of the base, and an input arm 22 is provided on the thread trimming spindle 21, which cooperates with the front end of the lower transmission lever 23. A movable knife 24 is provided at the front end of the thread trimming spindle 21, and the movable knife 24 cooperates with the fixed knife 25. The rear end of the lower transmission lever 23 is connected to the lower end of the longitudinal drive rod 6.

[0014] The working process of the utility model is as follows: the stepping motor 4 drives the swing arm 5 to swing up and down through the output shaft, the swing arm 5 drives the lower transmission lever 23 to swing through the driving connecting rod, the swing of the lower transmission lever 23 drives the thread trimming spindle 21 to rotate through the input arm 22, and the thread trimming spindle 21 drives the movable knife 24 to cooperate with the fixed knife 25 to complete the thread trimming work.

[0015] The utility model provides a transfer hole 11 at a position corresponding to the line connecting the free end of the swing arm 5 and the rear end of the lower transmission lever 23 corresponding to the head 1 and the base 2. By providing the transfer hole 11, components such as the transmission chamber, the upper transmission lever and the upper connecting rod are omitted, and the structures of the head and the transmission mechanism are simplified. The power of the stepping motor is directly transmitted to the thread cutting mechanism inside the base, reducing the transmission steps and energy loss, making the transmission mechanism structure more reasonable and compact.

Claims

1. A transmission mechanism for a thread trimming mechanism of a button sewing machine, comprising a machine head and a base, one end of the machine head being connected to the base via a connecting seat, a thread trimming motor being horizontally disposed on the back side of the connecting seat near the top, the thread trimming motor being electrically connected to the electronic control of the button sewing machine, characterized in that: The output shaft of the thread trimming motor is arranged at one end close to the button sewing mechanism, and a swing arm perpendicular to the output shaft is fixedly connected to the output shaft, and the free end of the swing arm extends toward the upper side of the machine head, and a transfer hole penetrating the machine head and the base is opened from top to bottom at the position of the free end of the swing arm of the machine head. The free end of the swing arm is movably connected to the upper end of the longitudinal drive rod, and the longitudinal drive rod passes downward through the transfer hole and is movably connected to the thread trimming mechanism inside the base.

2. The transmission mechanism of the thread trimming mechanism of a button sewing machine according to claim 1, characterized in that: The thread trimming mechanism includes a thread trimming spindle pivotally connected to the inside of the base, an input arm is provided on the thread trimming spindle, the input arm cooperates with the front end of the lower transmission lever, a movable knife is provided at the front end of the thread trimming spindle, the movable knife cooperates with the fixed knife, and the rear end of the lower transmission lever is connected to the lower end of the longitudinal drive rod.

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