High precision thread trimming device and method for embroidery machine

An embroidery machine, high-precision technology, applied to embroidery machines, embroidery machine mechanisms, textiles and papermaking, etc., can solve problems such as low precision, uncontrolled trimming length, lack of hook knife position trimming length, etc., to achieve high precision The effect of controlling and avoiding the fluctuation of spindle speed

Pending Publication Date: 2016-10-12
ZHEJIANG YUELONG SEWING EQUIP
15 Cites 18 Cited by

AI-Extracted Technical Summary

Problems solved by technology

The existing thread trimming method is generally that one upper thread driven by the flower machine needle passes through the cloth surface to form two upper threads. These two upper threads wrap the bottom thread under the cloth surface through the rotary hook. Scissors cut a strand of upper thread and lower thread, and the cut strand of upper thread and lower thread forms a thread end under the cloth surface. The scissors have no ability to control the length of the thread end, that is, the thread end will be long and short for a while. The main factor affecting the length of the thread head is the length of the thread trimming caused by the change in the time when the scissors start cutting the thread caused by the fluctuation of the speed of the spindle speed.
[0003] Of course, there are also mechanical structures such as hook knife, upper thread clamping, and thread hook in the existing thread trimming process, but these mechanical structures do not control the length of the thread trimming. The main function of the hook knife is to maintain the tension of the upper thread and to help Although...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Method used

As a further technical structure buckle wire hook 5 by electromagnet drive rotation, be installed on buckle wire hook installation module, buckle wire hook installation module 8 connects scissors installation module 13, further improves installation efficiency, reduces installation space.
Hook knife 1 advances and retreats starting signal is controlled by embroidery machine main shaft rotation angle, and hook knife goes back pause position by the position sensor 17 of hook knife motor drive shaft periphery, further improves hook knife position accuracy, just improves line trimming precision . Hook knife 1 pulls the upper thread on the cloth surface to retreat to determine the length of the two strands of upper...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention discloses a high precision thread trimming device and a high precision thread trimming method for an embroidery machine. The device comprises a plastic cutter driving device and a thread trimming device, wherein the plastic cutter driving device is arranged at the upper side of a faller; the thread trimming device is arranged at the lower side of the faller; the plastic cutter driving device comprises a plastic cutter motor; a position sensor and an eccentric wheel are respectively arranged on the periphery of a drive shaft of the plastic cutter motor; the eccentric wheel is connected with a swing rod with a sliding chute at one end by a pin roller; a stationary shaft connected with a motor base is arranged in the middle of the swing rod; the other end of the swing rod is connected with a pull rod driving a plastic cutter by a connecting rod. The device has the beneficial effects that the exact position of the plastic cutter when going back is determined via the position sensor on the periphery of the drive shaft of the plastic cutter motor, thus achieving high precision control of the thread trimming length and avoiding technical defects caused by main shaft speed fluctuation.

Application Domain

Embroidering machines apparatus

Technology Topic

Image

  • High precision thread trimming device and method for embroidery machine
  • High precision thread trimming device and method for embroidery machine
  • High precision thread trimming device and method for embroidery machine

Examples

  • Experimental program(1)

Example Embodiment

[0017] Such as Figure 1 to 4 The thread trimming device of an embroidery machine with high-precision trimming is shown, which includes a hook knife driving device located on the upper side of the needle plate 7 and a thread trimming device located on the lower side of the needle plate. The hook knife driving device includes a hook knife motor 16 The outer periphery of the drive shaft of the motor 16 is provided with a position sensor 17 and an eccentric wheel 22. The eccentric wheel 22 is connected by a roller to a pendulum rod 18 with a sliding groove at one end. The pendulum rod 18 is provided with a fixed shaft 23 connected to the motor base, and the pendulum rod 18 The other end is connected to a pull rod driving the hook knife 1 through a connecting rod 19. The knife hook motor 16 is installed on the bottom surface of the cross beam of the embroidery machine, and the swing rod 18 swings horizontally. The preferred technical structure is that the swing rod 18 and the connecting rod 19 are connected by a connecting block 20, the connecting block 20 is provided with front and rear adjusting grooves, and the front and rear adjusting grooves are connected with the swing rod 18, and the connecting block 20 is also provided with upper and lower adjusting pins 21 , The upper and lower adjusting pin 21 cooperates with the connecting rod 19. The connecting rod 19 is connected with a pull rod for controlling the hook knife 1, which realizes the adjustment of the up and down and front and back positions of the pull rod, and also achieves the adjustment of the up and down and front and rear positions of the hook knife 1.
[0018] The thread cutting device includes a rotary hook 6 with a bottom thread built-in. The side of the rotary hook 6 is provided with a thread hook 5 and scissors. The bottom thread in the rotary hook 6 is cut and placed on the bottom thread support frame 14. The rotary hook 6 is installed on the shuttle box 15. The bobbin thread support frame 8 and the scissors installation module 13 are respectively installed on the shuttle box 15. The fixed knife 3 and the movable knife 4 are respectively provided on the scissors installation module 13, and the movable knife 4 passes through the rotating shaft. 10 and the rotating shaft connecting rod 9 are connected to the scissors pull rod 11, and the scissors pull rod 11 is sleeved with a spring and a fixing bracket 12, so that the scissors can be opened and closed under the control of the scissors pull rod 11. The installation method of the scissors installation module greatly improves the installation efficiency and reduces the installation space.
[0019] As a further technical structure, the wire hook 5 is driven to rotate by an electromagnet and is installed on the wire hook installation module. The wire hook installation module 8 is connected to the scissors installation module 13, which further improves installation efficiency and reduces installation space.
[0020] A thread trimming method for embroidery machines with high-precision thread trimming. The needle 2 of the embroidery machine drives an upper thread through the cloth surface on the needle plate to form two upper threads. The two upper threads pass through the shuttle of the rotary hook 6. The tips separate and drive the upper thread to rotate to form a loop at the thread hook 5, the upper thread on the right side of the thread hook 5 is pulled by the hook knife 1, and the hook knife 1 moves back to the stop position to determine the two strands of the upper thread under the cloth. Length, and then determine the cutting position of the scissors relative to a strand of upper thread and bottom thread, and accurately determine the cutting length.
[0021] The feed and retreat start signal of the hook tool 1 is controlled by the rotation angle of the main shaft of the embroidery machine, and the stop position of the hook tool moving back is determined by the position sensor 17 on the outer circumference of the hook tool motor drive shaft, which further improves the position accuracy of the hook tool, that is, the precision of thread cutting. The hook knife 1 pulls the upper thread on the cloth surface to move back to determine the length of the two upper threads under the cloth. After the hook knife returns to the position, there will be a pause, and then the upper thread is clamped by the upper thread clamping mechanism of the embroidery machine , To realize the fixed position of the upper thread, the upper thread clamping mechanism of the embroidery machine can adopt the existing traditional clamping mechanism. In order to achieve multiple trimming lengths, the retracting position of the hook 1 is divided into 1 to 8 to achieve eight trimming lengths. As a specific implementation manner, 8 kinds of tool hook positions are realized by 1 to 8 position sensors 17. Of course, the number of hook positions can be set as required.
[0022] As a further technical method, in the thread trimming method, the motion signals of the embroidery machine needle, scissors, hook knife, and thread hook are all controlled by the rotation angle of the embroidery machine's main shaft.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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