A yarn return device for a knitting machine

Abstract

The present invention discloses a yarn rewinding device for a knitting machine, which includes a rewinding steel wire connected to a rewinding yarn tube. The yarn passing through the rewinding yarn tube has its rewinding amplitude and resistance controlled by the rewinding steel wire, and the yarn rewinding resistance is also controlled by a rewinding resistance adjusting device; the rewinding resistance adjusting device includes: a wire clamp, and the clamping force between the upper clamping piece and the lower clamping piece of the wire clamp for clamping the yarn is adjustable; the rewinding steel wire controls the amplitude of the yarn rewinding, which is controlled by a rewinding amplitude control device equipped with a driving component. Through the combined action of the rewinding resistance adjusting device and the rewinding amplitude control device, the present invention realizes good rewinding performance for various thicknesses of yarns.

Description

Technical Field

[0001] The present invention relates to a thread return device, specifically a yarn return device for knitting machines. Background Art

[0002] Most of the existing thread return devices for knitting machines are used for knitting and returning threads at the toe and heel of socks, and the turning angles are mostly within 180°. The target yarns for thread return are mostly cotton yarns and polyester covered yarns, and the thicknesses are all within 800 Denier. It can be seen that the existing thread return devices for knitting machines have the following deficiencies:

[0003] 1. The turning angle of fabric knitting has limitations and cannot be greater than 180°. When the turning angle is greater than 180°, the target yarn for thread return cannot be completely returned, and there will be a dotted line left at the starting position of the fabric.

[0004] 2. Different types of fabrics have different raw materials and thicknesses. Especially for shoe upper fabrics, the raw materials are very thick and hard, and the thread return resistance is large. When the existing thread return device returns the thread, asynchronous sliding is likely to occur between the yarn and the thread return bobbin, resulting in poor thread return.

[0005] 3. During the thread return process, due to space limitations, the intervals between the target yarns for thread return are not large, and the yarns are sometimes loose and sometimes tight, so the yarns are easily entangled with each other, leading to failures.

[0006] In view of this, the inventor of this case has conducted in-depth research on the above problems and needs to solve the following technical problems:

[0007] 1. How to control the thread return stroke when the turning angle of fabric knitting approaches 360 degrees and how to avoid leaving dotted lines and other technical problems.

[0008] 2. How to technically adjust or control the thread return resistance.

[0009] 3. How to avoid yarn entanglement. Summary of the Invention

[0010] The present invention provides a yarn return device for knitting machines with sufficient thread return stroke, adjustable resistance, and avoiding yarn entanglement.

[0011] A yarn return device for knitting machines includes a thread return wire connected to a thread return bobbin. The yarn passing through the thread return bobbin is controlled by the thread return wire for the thread return amplitude and resistance. The yarn return resistance is also controlled by a thread return resistance adjustment device. The thread return resistance adjustment device includes:

[0012] Thread clamp, the clamping force between the upper clamping piece and the lower clamping piece for clamping the yarn is adjustable; the specific adjustment method is that an adjustment cylinder is provided on the side between the upper clamping piece and the lower clamping piece, and the front end of the ejector rod of the adjustment cylinder is a conical structure. By controlling the distance between the upper clamping piece and the lower clamping piece with the ejector rod of the adjustment cylinder, the adjustment performance of the yarn resistance can be achieved, and it can also be used as a device for directly controlling whether there is a clamping force between the upper clamping piece and the lower clamping piece, that is, the upper clamping piece and the lower clamping piece are separated without clamping force and closed with clamping force.

[0013] The return wire controls the amplitude of the yarn return, which is controlled by a return amplitude control device equipped with a driving component. The return amplitude control device includes a return control block connected to the return wire. The return control block is respectively connected to the driving component and one end of the return spring. The other end of the return spring is connected to the spring adjusting piece, and the spring adjusting piece is installed on the adjusting piece fixing seat. The driving component is a cylinder or a motor. The return amplitude control device controls the length of the yarn return to be greater than or equal to the circumference of the corresponding knitting machine needle cylinder.

[0014] A support hole for connecting a support rod is provided in the middle of the return control block. One end of the return control block at the front and rear ends of the support hole is connected to the return wire, and one end is connected to the return spring. A return amplitude curve is provided on the edge of the return control block on the upper side of the support hole. The driving component cooperates with the return amplitude curve on the edge of the return control block to drive the rotation angle and linear speed of the return control block. This structure of the return control block not only realizes the connection and driving performance of the return wire, but also realizes the linear control of the amplitude and speed of the yarn return in cooperation with the driving component. Specifically, the greater the curve curvature, the faster the return speed, and the smaller the curvature, the slower the return speed, which can well meet the technical requirements of different return speeds according to different yarn thicknesses.

[0015] The return wires are divided into two or more different lengths and are commonly installed on the support rod to meet different requirements for the return length.

[0016] The yarn passing through the return yarn tube also passes through the anti-wind tube.

[0017] The return wire is connected with a wire guide plate. The wire guide plate is provided with a toothed structure for mating with the return wire for the reset and guiding of the return wire. A wire passing hole is provided on the lower side of the toothed structure of the wire guide plate.

[0018] The beneficial effects of the present invention are:

[0019] 1. Through scientific calculation, the designed swing stroke of the return wire needs to be greater than or equal to the circumference of the corresponding needle cylinder to ensure that when the rotation angle is up to 360°, the return stroke is sufficient, thus avoiding the problem that the target yarn for return is insufficient and generating dotted lines.

[0020] 2. Through the design and application of the thread clamping device, the friction between the yarn to be looped and the loop yarn tube at the front end of the loop wire is increased, thus avoiding the asynchronous sliding between the yarn and the loop yarn tube when the raw material is thick and hard, and effectively ensuring the loop effect;

[0021] 3. Through the design and application of the air duct prevention device at the front end of the loop yarn tube, the possibility of yarn entanglement is effectively avoided, and at the same time, the influence of the external environment (such as wind, negative pressure in the workshop, etc.) on the knitting yarn is greatly reduced;

[0022] 4. Through the design and application of the side adjustment cylinder of the thread clamping device, the state control of the tension of the yarn passing through the thread clamping device is realized, so as to meet the knitting needs of different stages of the yarn. (For example: when the same rubber band is used as the starting line and the surface line, this function needs to be applied. Because when starting, the smaller the tension of the rubber band, the better, otherwise the starting is easy to de-thread; while when used as the surface line, a certain tension needs to be given to the rubber band to ensure the flatness of the knitting pattern). BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of the yarn looping device of the knitting machine of the present invention;

[0024] Figure 2 is an exploded installation structural schematic diagram of the yarn looping device of the knitting machine of the present invention;

[0025] Figure 3 is a schematic diagram of the non-looping state of the yarn looping device of the knitting machine of the present invention;

[0026] Figure 4 is a schematic diagram of the looping state of the yarn looping device of the knitting machine of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] See the appendix Figures 1-4 A yarn looping device for a knitting machine includes a loop wire 5 connected to a loop yarn tube 3. The yarn 23 connected to the loop yarn tube 3 has its loop amplitude and resistance controlled by the loop wire 5, and the yarn loop resistance is also controlled by a loop resistance adjusting device. The loop resistance adjusting device includes:

[0028] A thread clamping device 8, and the clamping force between the upper clamping piece 9 and the lower clamping piece 10 of the thread clamping device 8 for clamping the yarn 23 is adjustable; the specific adjustment method can adopt spring adjustment, or the specific implementation scheme of the present invention is as follows:

[0029] There is an adjusting cylinder 11 on the side between the upper clamping piece 9 and the lower clamping piece 1. The front end of the ejector rod of the adjusting cylinder 11 is of a conical structure. The clamping force of the upper clamping piece 9 and the lower clamping piece 1 on the yarn is controlled by the ejector rod, so as to control the return line resistance. This technical structure can also directly control whether the upper clamping piece 9 and the lower clamping piece 1 clamp the yarn. The clamping force of the upper clamping piece 9 and the lower clamping piece 1 on the yarn can also be controlled by the conical spring inside the wire clamp 8. As a structural preference, the adjusting cylinder 11 is connected to the mounting plate of the adjusting cylinder 11 through a cylinder bracket 12.

[0030] The return wire 5 of the present invention controls the amplitude and length of the yarn 23's return, which is controlled by a return amplitude control device equipped with a driving component.

[0031] The return amplitude control device includes a return control block 6 connected to the return wire 5. The return control block 6 is respectively connected to the driving component and one end of the return spring 16 in a matching manner. The other end of the return spring 16 is connected to the spring adjusting piece 2, and the spring adjusting piece 2 is installed on the adjusting piece fixing seat 17. The adjusting piece fixing seat 17 is connected to the return bottom plate 18, and a cylinder 25 or a motor as the driving component is also installed on the return bottom plate 18. The cylinder 25 is installed on the cylinder seat 22, and the cylinder seat 22 is connected to the support hole in the middle of the return control block 6 through a support rod 21. One end of the return control block at the front and rear ends of the support hole is connected to the return wire 5, and one end is connected to the return spring. There is a return amplitude curve on the edge of the return control block on the upper side of the support hole. The driving component cooperates with the return amplitude curve on the edge of the return control block to drive the rotation angle and linear speed of the return control block. As the top rod on the cylinder 25 drives the return control block 6 to swing back and forth in cooperation with the return spring 16.

[0032] As a structural preference, the length of the yarn return controlled by the return amplitude control device is greater than or equal to the circumference of the corresponding knitting machine needle cylinder diameter.

[0033] In order to achieve multiple return states, the return wires are divided into two or more with different lengths and are jointly installed on the support rod.

[0034] In order to prevent the yarn from winding, the yarn passing through the return yarn tube 3 also passes through the anti-wind tube 1. The anti-wind tube 1 is connected to the anti-wind tube fixing plate 20 outside the return yarn tube 3. The anti-wind tube fixing plate 20 is connected to the return bottom plate 18 through a wire guide plate 4. A cover 13 is installed on the back of the return bottom plate 18, and a fixed arm 15 is connected to the cover 13. The wire guide plate 4 is provided with a toothed structure for mating with the return wire 5 for the reset guiding of the return wire. There is a wire passing hole on the lower side of the toothed structure of the wire guide plate to realize the wire passing guiding of the yarn and the support guiding of the return wire 5.

[0035] The working principle of the present invention is as follows: When the knitting equipment is operating in a single direction for knitting, the return wire 5 is in a non-return state under the action of the corresponding cylinder 25 of the normally open solenoid valve, and the knitting yarn is in a taut state with a single tension given by the wire clamp 8; when the knitting equipment is operating in an alternating forward and reverse knitting process, the normally open solenoid valve receives a closing signal, and the corresponding cylinder 25 is reset under the action of the cylinder top spring 7. The return wire 5 starts to return under the action of the return wire tension spring 16 and is in a return state. The knitting yarn is in a taut state under the combined tension of the wire clamp 8 and the return wire tension spring 16; when the knitting equipment is operating in an alternating forward and reverse knitting process, if there is no application of a return wire resistance adjustment device, it will inevitably cause the relaxation of the knitting yarn, resulting in frequent problems such as yarn entanglement, dotted lines, and unevenness.

Claims

1. A yarn rewinding device for a knitting machine, comprising a rewinding steel wire connected to a rewinding yarn tube, and the yarn passing through the rewinding yarn tube is controlled by the rewinding steel wire for the rewinding amplitude and resistance, characterized in that: The yarn return resistance described above is also controlled by a return resistance adjustment device; the return resistance adjustment device includes: a wire clamp, and the clamping force between the upper clamping piece and the lower clamping piece of the wire clamp for clamping the yarn is adjustable; the return wire controls the amplitude of the yarn return, and is controlled by a return amplitude control device equipped with a driving component; the return amplitude control device includes a return control block connected to the return wire, the return control block is respectively connected to the driving component and one end of a return spring in a mating manner, the other end of the return spring is connected to a spring adjusting piece, and the spring adjusting piece is installed on an adjusting piece fixing seat. A support hole for connecting a support rod is provided in the middle of the return control block. One end of the return control block at the front and rear ends of the support hole is connected to the return wire, and one end is connected to the return spring. A return amplitude curve is provided on the edge of the return control block on the upper side of the support hole. The driving component drives the rotation angle and linear speed of the return control block in cooperation with the return amplitude curve on the edge of the return control block; the return amplitude control device controls the length of the yarn return to be greater than or equal to the circumference of the corresponding knitting machine needle cylinder diameter.

2. The yarn return device of a knitting machine according to claim 1, characterized in that: An adjustment cylinder is provided on the side between the upper clamping piece and the lower clamping piece.

3. The yarn rewinding device of a knitting machine according to claim 1, characterized in that: The driving component is a cylinder or a motor.

4. The yarn rewinding device of a knitting machine according to claim 1, characterized in that: The return wires are divided into two or more types with different lengths and are commonly installed on the support rod.

5. The yarn return device of a knitting machine according to claim 1, characterized in that: The yarn passing through the return yarn tube also passes through an air duct protection tube.

6. The yarn return device of a knitting machine according to claim 1, characterized in that: The return wire is connected with a wire guide plate in a mating manner. The wire guide plate is provided with a tooth-shaped structure for mating with the return wire for the return guiding of the return wire. A wire passing hole is provided on the lower side of the tooth-shaped structure of the wire guide plate.

7. The yarn return device of a knitting machine according to claim 2, characterized in that: The front end of the ejector rod of the adjustment cylinder is a conical structure.

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