Yarn feeding mechanism of underwear machine

Abstract

The invention discloses a yarn feeding mechanism of an underwear machine, which comprises a shuttle, an air cylinder and a piston, the end part of the shuttle is used for penetrating yarns, and the piston is used for jacking the shuttle; the upper part of the crank is pivoted on the rack, and the lower part of the crank is pivoted with the shuttle; the two pistons are respectively a first piston and a second piston; the rear end of the crank upper part is matched with the first piston; yarn penetrates through the front end of the shuttle, the rear end of the shuttle is matched with the second piston, and meanwhile the rear end of the shuttle is connected with the air cylinder body through a first spring. The front end of the shuttle can move in the radial direction and the axial direction at the same time, the radial direction and the axial direction are both completed through movement of the piston, and therefore automatic control can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of knitting machinery, in particular to an underwear machine, and more specifically to a yarn feeding mechanism of the underwear machine. Background Art

[0002] The underwear machine is a type of circular knitting machine, which makes underwear by weft knitting. Because it is not like traditional cut-out underwear that is made of multiple pieces, there is no connection seam on the underwear, which is called seamless underwear, and is therefore popular with consumers. As a weft knitting machine, the underwear machine also needs a yarn feeding mechanism to provide yarn, so that it can cooperate with the knitting needles to knit; compared with weft knitting machines such as flat knitting machines and sock machines, the underwear machine has more shuttles, so the yarn feeding mechanism needs to have more working positions to obtain a good knitting effect.

[0003] The position of the yarn feeding mechanism is essentially the position of each shuttle relative to the needles; the needles are arranged vertically in a circle, and the shuttle cooperates with the needles on a roughly horizontal plane. The shuttle needs to have more points relative to the needle heads.

[0004] The closest prior art in this field is Chinese patent CN101021028A, which relates to a yarn guiding and feeding device of a seamless underwear machine, including an integrated cylinder and a square shuttle plate installed on a disc, a plurality of knitting needles and a grabbing needle located in front of the integrated cylinder and installed on the same disc as the integrated cylinder for opening the knitting needle tongue, and a plurality of yarn adding shuttles for conveying different yarns, including a face yarn adding shuttle, a colored yarn adding shuttle, and a bottom yarn adding shuttle. Each yarn adding shuttle has a plurality of working positions controlled by the integrated cylinder. The face yarn adding shuttle for conveying the face yarn has five working positions, and the rest have two working positions, namely, the original position and the bottom position. Among them, three are used to convey the bottom yarn and three are used to convey the colored yarn. The integrated cylinder is provided with air paths leading to a plurality of pistons arranged therein, and each piston is used to control the working positions of a plurality of yarn adding shuttles.

[0005] In the above-mentioned prior art, the yarn shuttle has five working positions, namely the original position, the front full position, the front half position, the rear full position, and the rear half position. These five positions are derived from the two movement directions of the shuttle. One is radial movement, that is, movement close to or away from the axis of the needle cylinder; the other is axial movement, that is, the up and down movement of the end of the shuttle. In fact, the shuttle is similar to the up and down swing of a lever, and its end is an arc, but it can be approximately understood as axial movement. Through the combination of these two movement directions, six positions can be obtained, and the prior art uses five of them as working positions. Among them, the axial movement, the prior art uses the cooperation of a cylinder and a spring to push and reset; the radial movement is not described in detail in the literature, and it is manually adjusted in actual production. Obviously, manual adjustment can only be performed when the machine is turned off, that is to say, it does not have so many working positions when the machine is turned on, so the weaving effect is greatly reduced. Summary of the invention

[0006] The object of the present invention is to provide a yarn feeding mechanism for an underwear machine, which enables the shuttle to have radial and axial movements at the same time.

[0007] The technical solution adopted by the present invention is as follows: the yarn feeding mechanism of the underwear machine includes a shuttle, a cylinder and a piston, the end of the shuttle is used to thread the yarn, and the piston is used to push the shuttle; it is characterized in that it also includes a crank, the upper part of the crank is pivotally connected to the frame, and the lower part is pivotally connected to the shuttle; the piston includes two, namely the first piston and the second piston; the rear end of the upper part of the crank cooperates with the first piston; the front end of the shuttle is threaded with yarn, the rear end of the shuttle cooperates with the second piston, and the rear end of the shuttle is connected to the cylinder body through the first spring.

[0008] The coordinate system of the present invention is based on the vertical direction, that is, the axial direction is up and down, and in the radial direction, the direction toward the knitting needle is the front, and the direction away from the knitting needle is the back.

[0009] Furthermore, the cylinder includes two, namely a first cylinder and a second cylinder; the first cylinder is located above the crank and the shuttle, and the first piston is installed on the first cylinder to push the rear end of the upper part of the crank downward; the second cylinder is located below the crank and the shuttle, and the second piston is installed on the second cylinder to push the rear end of the shuttle upward; one end of the first spring is connected to the rear end of the shuttle, and the other end is connected to the first cylinder, and its elastic force is used to pull the rear end of the shuttle upward.

[0010] An extension portion is provided at the front end of the first cylinder; the second spring connects the extension portion of the first cylinder and the front portion of the shuttle, and uses its elastic force to pull the front portion of the shuttle upward.

[0011] The front end of the upper part of the crank is provided with a limiting platform, and the front part of the first cylinder is provided with a limiting screw extending downwards, which cooperates with the limiting platform to limit the stroke of the crank.

[0012] The rear end of the shuttle has a bottom surface that is inclined upward so as to match with the top surface of the second piston.

[0013] The shuttle involved in the above is a veil shuttle.

[0014] The working state of the present invention is as follows. When the first piston pushes the crank downward, the crank rotates around the pivot connected to the frame, so that the lower part of the crank moves forward, that is, drives the shuttle forward; when the second piston pushes the rear end of the shuttle upward, the shuttle rotates around the pivot connected to the crank, so that the front end of the shuttle moves downward; when the first piston and the second piston are reset, the first spring pulls the rear end of the shuttle upward and backward, so that the shuttle and the crank return to the initial position; the second piston acts on the front part of the shuttle, and when the first piston still pushes the crank downward, only the second piston is reset, the second spring can move the front end of the shuttle upward without returning the radial position of the shuttle.

[0015] From the above analysis, it can be seen that the present invention allows the front end of the shuttle to have radial and axial movements at the same time, and both are completed through the movement of the piston, so automatic control can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the appearance of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the present invention.

[0018] Figure 3 , Figure 4 It is a force analysis diagram of the present invention.

[0019] The accompanying drawings are marked as follows: 1-second cylinder; 2-first cylinder; 3-shuttle; 31-porcelain tube; 32-rear end face of shuttle; 4-rivet pin; 5-crank; 6-axle pin; 7-second spring; 8-limit screw; 9-first piston; 10-first spring; 11-second piston.

[0020] In all the drawings, the left side of the drawing is called the back, and the right side is the direction in which the yarn extends and cooperates with the knitting needles, which is called the front. DETAILED DESCRIPTION

[0021] See attached picture. Figure 1 The figure shows an integral yarn feeding device, which includes multiple yarn feeding mechanisms, corresponding to shuttles with different functions. The present invention mainly relates to the face yarn shuttle 3 and the corresponding control mechanism.

[0022] Figure 2 The figure shows the feeding mechanism of one of the face yarn shuttles. The shuttle 3 and the crank 5 are pivoted by the rivet pin 4, and the crank 5 is pivoted on the cylinder body by the shaft pin 6, so that the crank 5 can rotate around the fixed pivot point. There are a first cylinder 2 and a first piston 9 above the crank and the shuttle, and a second cylinder 1 and a second piston 11 below the crank and the shuttle; the first piston 9 acts on the upper rear end of the crank 5 to push the crank to rotate counterclockwise, and the second piston 11 acts on the rear end of the shuttle 3 to push the shuttle to rotate clockwise.

[0023] The first cylinder is also provided with a first spring 10 and a second spring 7, which are respectively connected to the rear and front of the shuttle 3. The first cylinder is also provided with a limit screw 8, which extends downward to cooperate with the front end of the upper part of the crank 5, thereby limiting the stroke of the crank rotating around the shaft pin 6.

[0024] The front end of the shuttle 3 is provided with a porcelain tube 31 through which the yarn passes. The rear end face 32 is a sloped surface that is inclined backward and upward to better cooperate with the second piston.

[0025] See also Figure 2 , Figure 3 . Figure 3 A is the point where the shaft pin 6 is located, and B is the point where the rivet pin 4 is located. When the first piston 9 applies a downward vertical thrust F3 to the upper rear end of the crank 5, it forms a couple ω2 around point A, causing it to rotate around point A by an angle of θ2. Point B itself is not fixed and rotates to point B´. The BC´ movement is B´C", and the head of the veil shuttle 3 is displaced from point C´ to point C", thereby achieving horizontal displacement with a distance of S.

[0026] See also Figure 2 , Figure 4 When the second piston 11 applies an upward vertical thrust F1 to the rear end of the veil shuttle 3, it forms a couple ω1 around point B, causing point C at the head of the veil shuttle 3 to rotate around point B by an angle of θ1, and point C moves to point C´, thereby achieving vertical displacement with a distance of H. It should be pointed out that point B is not fixed at this time, but since the crank 5 does not participate in the movement, the spatial position of point B is actually unchanged, and the shuttle 3 can rotate around point B.

[0027] The piston pushes to overcome the pulling force of the first spring and the second spring to produce the action. When the piston is reset, the spring pulls the crank and the shuttle to return to their original positions.

[0028] It can be seen from the above description that in this embodiment, by controlling the two pistons, the porcelain tube at the front end of the shuttle can move forward and backward and up and down.

Claims

1. The yarn feeding mechanism of the underwear machine includes a shuttle, a cylinder and a piston. The end of the shuttle is used to thread the yarn, and the piston is used to push the shuttle. The characteristics are: It also includes a crank, the upper part of which is pivotally connected to the frame, and the lower part is pivotally connected to the shuttle; the pistons include two, namely the first piston and the second piston; the rear end of the upper part of the crank cooperates with the first piston; the front end of the shuttle is threaded with yarn, the rear end of the shuttle cooperates with the second piston, and the rear end of the shuttle is connected to the cylinder body through the first spring.

2. The yarn feeding mechanism of the underwear knitting machine according to claim 1, characterized in that: The cylinders include two, namely the first cylinder and the second cylinder; the first cylinder is located above the crank and the shuttle, and the first piston is installed on the first cylinder to push the rear end of the upper part of the crank downward; the second cylinder is located below the crank and the shuttle, and the second piston is installed on the second cylinder to push the rear end of the shuttle upward; one end of the first spring is connected to the rear end of the shuttle, and the other end is connected to the first cylinder, and the rear end of the shuttle is pulled upward by using its elastic force.

3. The yarn feeding mechanism of the underwear knitting machine according to claim 2, characterized in that: An extension portion is provided at the front end of the first cylinder; the second spring connects the extension portion of the first cylinder and the front portion of the shuttle, and uses its elastic force to pull the front portion of the shuttle upward.

4. The yarn feeding mechanism of the underwear knitting machine according to any one of claims 1 to 3, characterized in that: The front end of the upper part of the crank is provided with a limiting platform, and the front part of the first cylinder is provided with a limiting screw extending downwards, which cooperates with the limiting platform to limit the stroke of the crank.

5. The yarn feeding mechanism of the underwear knitting machine according to any one of claims 1 to 3, characterized in that: The rear end of the shuttle has a bottom surface that is inclined upward so as to match with the top surface of the second piston.

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