Needle transmission mechanism of embroidery machine

Abstract

The utility model discloses a needle transmission mechanism of an embroidery machine, which comprises a cam connecting rod connected with a cam mechanism and a driving frame connected with the cam connecting rod through a connecting rod mechanism and capable of sliding up and down on a fixed shaft, and a driving block with a duckbilled opening is arranged in the driving frame and is matched with a connecting block fixed on a needle; the driving block can rotate around the fixed shaft and slide up and down, and a torsional spring is arranged at the top of the driving block and connected with the driving frame; a poke rod is arranged on the side face of the driving block and connected with a poke device. When the embroidery machine works, the needle can be stopped in time.

Description

Technical Field

[0001] The utility model relates to the technical field of embroidery machines, in particular to a needle transmission mechanism of an embroidery machine. Background Art

[0002] Generally, when an embroidery machine is working, the cam mechanism drives the needle bar to embroider up and down. The cam mechanism and the needle bar are always in a linkage state. Once an emergency occurs, the cam mechanism cannot stop the needle bar immediately, so the needle bar continues to embroider up and down by inertia, causing problems with the embroidery. Therefore, it is necessary to study an embroidery machine needle transmission mechanism that can disengage the embroidery machine needle bar in time. Utility Model Content

[0003] The utility model discloses a needle bar disengagement mechanism for an embroidery machine, which can stop the needle bar in time when the embroidery machine is working. The specific technical scheme is as follows:

[0004] A needle transmission mechanism for an embroidery machine comprises a cam connecting rod connected to a cam mechanism, and a driving frame which can slide up and down on a fixed axis is connected through the connecting rod mechanism. A driving block with a duckbill is arranged in the driving frame, and cooperates with a connecting block fixed on the needle; the driving block can rotate around the fixed axis and slide up and down, a torsion spring is arranged on the top of the driving block, and is connected to the driving frame; a toggle rod is arranged on the side of the driving block, and is connected to a toggle device.

[0005] The toggle device comprises a toggle connecting rod fixedly connected to the output shaft of the motor, and the end of the toggle connecting rod is connected to the toggle block.

[0006] The motor output shaft passes through the motor, a limit rod is arranged at the tail of the output shaft, two limit retaining rings are arranged on the side of the motor, and the end of the limit rod moves between the two limit retaining rings, thereby controlling the rotation angle of the motor output shaft and controlling the toggle displacement of the wave connecting rod and the toggle block.

[0007] A stopper is provided on the lower side of the driving frame, which can block the duckbill opening of the driving block, thereby limiting the original position of the driving block and ensuring cooperation with the connecting block on the needle.

[0008] The connecting rod mechanism comprises a three-eye connecting rod, the end of the cam connecting rod is connected to the middle part of the three-eye connecting rod, the head of the three-eye connecting rod is a positioning fulcrum, and the tail is connected to the driving frame through a small connecting rod.

[0009] The utility model drives the cam connecting rod and the connecting rod mechanism to work through the cam mechanism, drives the driving frame to slide up and down on the fixed shaft, drives the driving block with the duckbill in the driving frame, and drives the needle with the connecting block to embroider up and down.

[0010] The motor output shaft of the toggle device works, driving the toggle connecting rod and the toggle block to swing back and forth. The toggle block can toggle the toggle rod on the side of the driving block, so that the driving block rotates around the fixed axis, and the duckbill of the driving block disengages from the connecting block on the needle, so that the needle bar can stop in time; the toggle block swings backward, and the driving block resets under the action of the torsion spring, and the duckbill of the driving block cooperates with the connecting block on the needle again, so that the needle continues to embroider normally up and down. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the structure of the connecting rod mechanism of the utility model. DETAILED DESCRIPTION

[0013] like Figure 1-2 As shown, an embroidery machine needle transmission mechanism includes a cam connecting rod 2 connected to a cam mechanism 1, and a driving frame 4 that can slide up and down on a fixed shaft 3 is connected through a connecting rod mechanism. A driving block 6 with a duckbill mouth 5 is arranged in the driving frame 4, and cooperates with a connecting block 8 fixed on a needle 7; the driving block 6 can rotate around the fixed shaft 3 and slide up and down, a torsion spring 9 is arranged on the top of the driving block 6, and is connected to the driving frame 4; a toggle rod 10 is arranged on the side of the driving block 6, and is connected to a toggle device.

[0014] The toggle device includes a toggle connecting rod 13 fixedly connected to the output shaft 12 of the stepping motor 11 , and the end of the toggle connecting rod 13 is connected to a toggle block 14 .

[0015] The motor output shaft 12 passes through the motor 11, a limit rod 15 is provided at the tail of the output shaft 12, two limit retaining rings 16 are provided on the side of the motor 11, and the end of the limit rod 15 can move between the two limit retaining rings 16, thereby limiting the rotation angle of the motor output shaft 12 and controlling the toggle displacement of the wave connecting rod 13 and the toggle block 14.

[0016] A stopper 19 is disposed on the lower side of the driving frame 4 to block the duckbill opening 5 of the driving block 6 , thereby limiting the original position of the driving block 6 and ensuring cooperation with the connecting block 8 on the needle 7 .

[0017] The connecting rod mechanism includes a three-eye connecting rod 17, the end of the cam connecting rod 2 is connected to the middle of the three-eye connecting rod 17, the head of the three-eye connecting rod 17 is a positioning fulcrum, and the tail is connected to the driving frame 4 through a small connecting rod 18.

[0018] The utility model drives the cam connecting rod 2, the three-eye connecting rod 17 and the small connecting rod 18 to work through the cam mechanism 1, drives the driving frame 4 to slide up and down on the fixed shaft 3, drives the driving block 6 with the duckbill 5 in the driving frame 4, and drives the needle 7 with the connecting block 8 to embroider up and down.

[0019] The output shaft 12 of the motor 11 of the toggle device works, driving the toggle connecting rod 13 and the toggle block 14 to swing back and forth. The toggle block 14 can toggle the toggle rod 10 on the side of the driving block 6, so that the driving block 6 rotates around the fixed axis 3, and the duckbill 5 of the driving block 3 disengages from the cooperation with the connecting block 8 on the needle 7, so that the needle 7 can stop in time; the toggle block 14 swings backward, and the driving block 6 is reset under the action of the torsion spring 9, and the duckbill 5 of the driving block 6 cooperates with the connecting block 8 on the needle 7 again, so that the needle 7 continues to embroider normally up and down.

[0020] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An embroidery machine needle transmission mechanism, characterized in that: It includes a cam connecting rod connected to the cam mechanism, and a driving frame that can slide up and down on a fixed axis is connected through the connecting rod mechanism. A driving block with a duckbill mouth is arranged in the driving frame, and cooperates with a connecting block fixed on the needle; the driving block can rotate around the fixed axis, a torsion spring is arranged on the top of the driving block, and is connected to the driving frame; a toggle rod is arranged on the side of the driving block, and is connected to the toggle device.

2. The embroidery machine needle transmission mechanism according to claim 1, characterized in that: The toggle device comprises a toggle connecting rod fixedly connected to the output shaft of the motor, and the end of the toggle connecting rod is connected to the toggle block.

3. The embroidery machine needle transmission mechanism according to claim 2, characterized in that: The motor output shaft passes through the motor, a limit rod is arranged at the tail of the output shaft, two limit retaining rings are arranged on the side of the motor, and an end s of the limit rod is arranged between the two limit retaining rings.

4. The embroidery machine needle transmission mechanism according to claim 1, characterized in that: A stopper which can block the duckbill opening of the driving block is arranged on the side surface of the lower part of the driving frame.

5. The embroidery machine needle transmission mechanism according to claim 1, characterized in that: The connecting rod mechanism comprises a three-eye connecting rod, the end of the cam connecting rod is connected to the middle part of the three-eye connecting rod, the head of the three-eye connecting rod is a positioning fulcrum, and the tail is connected to the driving frame through a small connecting rod.

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