Yarn path tension control device of warp knitting machine

Abstract

The utility model discloses a warp knitting machine yarn path tension control device which is installed on a yarn feeding path between a warp beam and a looping area and comprises a support, a first yarn guide rod, a first swing rod and a tension detection mechanism used for detecting yarn tension. The first yarn guide rod is in transmission connection with a servo motor, a plurality of first elastic connecting pieces are installed on the first yarn guide rod at intervals in the axial direction of the first yarn guide rod, the other ends of the first elastic connecting pieces are connected with the first swing rod, and the axial direction of the first swing rod is the same as the axial direction of the first yarn guide rod. Yarn sequentially bypasses the first swing rod and the first yarn guide rod to enter the looping area, the tension detection mechanism is located on a yarn feeding path between the first yarn guide rod and the looping area, and the tension detection mechanism and the servo motor are in communication connection with a controller. The structure is simple, yarn active compensation is achieved, and yarn tension is balanced.

Description

Technical Field

[0001] The utility model relates to a warp knitting machine, in particular to a yarn path tension control device of the warp knitting machine. Background Art

[0002] When the warp knitting machine is in normal operation, the warp yarn is unwound from the warp beam and fed into the loop forming system according to a certain warp feeding amount for the loop forming mechanism to weave. During the weaving process of the warp knitting machine, from the yarn guide rod above the comb bed to the loop forming mechanism, the length of the yarn path will change due to the swing of the comb seat, and the yarn at both ends of the yarn guide tube is prone to yarn skipping, which affects the quality of the weaving. The utility model patent of Chinese Patent No. 201820360580.9 applied by the applicant discloses a yarn guide compensation mechanism of a warp knitting machine, including a frame, a yarn guide roller seat installed on the frame, a yarn guide tube and a yarn pressing tube inserted into the yarn guide roller seat, the end of the yarn guide tube is connected to a tension compensation mechanism, a yarn guide cap for passing yarn is connected to the yarn guide tube through a plurality of snail springs, one end of the snail spring located on the outermost side is connected to the yarn guide cap, and the other end is connected to a support shaft fixed to the yarn guide roller seat, the tension compensation mechanism includes a shock-absorbing cylinder assembly, a spring sleeved on the outer surface of the shock-absorbing cylinder assembly, and a clamping ring, one end of the shock-absorbing cylinder assembly is fixed to the frame, and the other end is connected to the end of the yarn guide tube through a connecting plate, and the spring is clamped between the end of the shock-absorbing cylinder assembly connected to one end of the connecting plate and the clamping ring. This structure is used for yarn compensation of warp knitting machines, reducing the occurrence of yarn jumper phenomenon on both sides of the yarn guide tube. However, this compensation is passive compensation, which will cause fluctuations in yarn tension. As production needs, the more the number of combs, the faster the warp knitting machine runs, and the larger the swing amplitude required. How to improve the balance of yarn tension to adapt to the high-speed operation of the warp knitting machine and improve the quality of the cloth is the focus and difficulty of the industry in debugging warp knitting machines. Utility Model Content

[0003] The utility model aims to provide a yarn path tension control device for a warp knitting machine.

[0004] The technical solution to achieve the purpose of the utility model is: a warp knitting machine yarn path tension control device, which is installed on the yarn feeding path between the warp beam and the loop forming area, and comprises a bracket, a first yarn guide rod, a first rocker rod and a tension detection mechanism for detecting the yarn tension, the first yarn guide rod is rotatably installed on the bracket, the first yarn guide rod is transmission connected to the servo motor, a plurality of first elastic connecting members are installed on the first yarn guide rod along the axial interval, the other end of the first elastic connecting member is connected to the first rocker rod, the axial direction of the first rocker rod is in the same direction as the axial direction of the first yarn guide rod, the yarn bypasses the first rocker rod and the first yarn guide rod in turn to enter the loop forming area, the tension detection mechanism is located on the yarn feeding path between the first yarn guide rod and the loop forming area, the tension detection mechanism and the servo motor are communicatively connected to the controller.

[0005] Furthermore, the tension detection mechanism includes a position sensor installed on a yarn feeding path between the first yarn guide rod and the loop forming area.

[0006] Furthermore, the tension detection mechanism also includes a second yarn guide rod and a second rocker arm, the second yarn guide rod is detachably mounted on the bracket, a plurality of second elastic connecting members are installed on the second yarn guide rod at intervals along its axial direction, the other end of the second elastic connecting member is connected to the second rocker arm, the axial direction of the second rocker arm is in the same direction as the axial direction of the second yarn guide rod, and the position sensor is used to detect the tension change of the yarn on the second rocker arm.

[0007] Furthermore, the first elastic connecting member is a spring sheet.

[0008] Furthermore, the second elastic connecting member is a spring.

[0009] The first swing arm of the yarn path tension control device of the warp knitting machine implemented by the utility model is driven by a servo motor to swing, and the tension detection mechanism feeds back the force position change data of the yarn close to it on the yarn feeding path to the control system, and the control system controls the direction and speed of the servo motor according to the feedback data, adjusts the swing amplitude and frequency of the first swing arm, performs yarn collection or yarn release, realizes active yarn compensation, and balances the yarn tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of the yarn path tension control device for a warp knitting machine according to an embodiment of the utility model; wherein the arrow represents the direction of the yarn;

[0011] Figure 2 This is a schematic diagram of the installation structure of the bracket, the first yarn guide rod and the first swing rod according to the embodiment of the utility model;

[0012] Figure 3This is a control circuit block diagram of the yarn path tension control device for a warp knitting machine described in an embodiment of the utility model. DETAILED DESCRIPTION

[0013] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0014] like Figures 1 to 3 As shown, a yarn path tension control device for a warp knitting machine is installed on a yarn feeding path between a warp beam and a loop forming area 100, and comprises a bracket 1, a first yarn guide rod 2, a first rocker arm 3 and a tension detection mechanism 4 for detecting yarn tension; the first yarn guide rod 2 is rotatably mounted on the bracket 1, the first yarn guide rod 2 is transmission-connected to a servo motor 5, a plurality of first elastic connecting members 6 are installed on the first yarn guide rod 2 at intervals along its axial direction, the other end of the first elastic connecting member 6 is connected to the first rocker arm 3, the axial direction of the first rocker arm 3 is in the same direction as the axial direction of the first yarn guide rod 2, and the tension detection mechanism 4 is located on the yarn feeding path between the first yarn guide rod 2 and the loop forming area 100.

[0015] The tension detection mechanism 4 includes a position sensor 41, a second yarn guide rod 42 and a second swing rod 43. The second yarn guide rod 42 is detachably mounted on the bracket 1. A plurality of second elastic connectors 44 are installed on the second yarn guide rod 42 along its axial direction. The other end of the second elastic connector 44 is connected to the second swing rod 43. The axial direction of the second swing rod 43 is in the same direction as the axial direction of the second yarn guide rod 42. The position sensor 41 is used to detect the tension change of the yarn 10 on the second swing rod 43. The yarn 10 bypasses the first swing rod 3, the first yarn guide rod 2 and the second swing rod 43 in sequence and enters the loop forming area 100; the position sensor 41 and the servo motor 5 are respectively connected to the controller 7 for communication.

[0016] During operation, the first yarn guide rod 2 is driven by the servo motor 5, which in turn drives the first swing rod 3 to swing. The position sensor feeds back the force position change data of the yarn on the second swing rod on the yarn feeding path to the control system (not shown). The control system controls the direction and speed of the servo motor 5 based on the feedback data, thereby adjusting the swing amplitude and frequency of the first swing rod 3, performing yarn collection or yarn release actions, realizing active yarn compensation, balancing the yarn tension, and thereby improving the fabric quality and machine speed.

[0017] The tension detection mechanism of the utility model is not limited to that shown in the embodiment, and may only include a position sensor. Since it is located on the yarn feeding path between the first yarn guide rod and the loop forming area and is close to the loop forming area, the yarn produces tension changes with the swing of the comb seat, and the tension detection data is reasonable and reliable. Adding a second yarn guide rod and a second rocker rod can passively synchronize the yarn tension when the tension of the same group of yarns changes. The first elastic connecting member is preferably a spring with higher strength, and the second elastic connecting member has lower strength requirements, and a spring can be selected.

[0018] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A yarn path tension control device for a warp knitting machine, which is installed on the yarn feeding path between the warp beam and the loop forming area, characterized in that: It includes a bracket, a first yarn guide rod, a first rocker rod and a tension detection mechanism for detecting yarn tension, the first yarn guide rod is rotatably mounted on the bracket, the first yarn guide rod is transmission-connected to a servo motor, a plurality of first elastic connectors are installed on the first yarn guide rod along its axial interval, the other end of the first elastic connector is connected to the first rocker rod, the axial direction of the first rocker rod is in the same direction as the axial direction of the first yarn guide rod, the yarn sequentially bypasses the first rocker rod and the first yarn guide rod to enter the loop forming area, the tension detection mechanism is located on the yarn feeding path between the first yarn guide rod and the loop forming area, the tension detection mechanism and the servo motor are communicatively connected to a controller.

2. The yarn path tension control device for a warp knitting machine according to claim 1, characterized in that: The tension detection mechanism includes a position sensor installed on a yarn feeding path between the first yarn guide rod and the loop forming area.

3. The yarn path tension control device for a warp knitting machine according to claim 2, characterized in that: The tension detection mechanism also includes a second yarn guide rod and a second rocker rod. The second yarn guide rod is detachably mounted on the bracket. A plurality of second elastic connecting members are installed on the second yarn guide rod at intervals along its axial direction. The other end of the second elastic connecting member is connected to the second rocker rod. The axial direction of the second rocker rod is in the same direction as that of the second yarn guide rod. The position sensor is used to detect the tension change of the yarn on the second rocker rod.

4. The yarn path tension control device for a warp knitting machine according to claim 3, characterized in that: The first elastic connecting member is a spring sheet.

5. The yarn path tension control device for a warp knitting machine according to claim 3, characterized in that: The second elastic connecting member is a spring.

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