Yarn feeding mechanism of seamless underwear machine

Abstract

The invention discloses a yarn feeding mechanism of a seamless underwear machine, which comprises a shuttle, a cylinder and a piston, the front end of the shuttle is used for penetrating yarns, and the piston is used for directly or indirectly jacking the shuttle; the crank is pivoted on the rack through a fulcrum, the front end of the crank is pivoted with the rear end of the shuttle, the rear end of the crank is matched with the piston, and the piston pushes the rear end of the crank from bottom to top; a first connecting end is arranged at the front part of the crank, a second connecting end is arranged at the front part of the shuttle, and a first spring is connected with the first connecting end and the second connecting end; a second spring is further arranged at the rear end of the crank, and the elastic force direction of the second spring is opposite to the pushing direction of the piston. According to the invention, the front end of the shuttle can have axial and radial movements in sequence, and the axial and radial movements are both completed through the movement of the piston, so that automatic control can be realized.

Description

Technical Field

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

[0002] Seamless underwear knitting machine is a kind of circular knitting machine, which makes underwear by weft knitting. Because it is not like traditional cut-out underwear which is made of multiple pieces, there is no connection seam on the underwear, so it is called seamless underwear, which is loved by consumers. As a weft knitting machine, underwear knitting machine also needs a yarn feeding mechanism to provide yarn, so as to cooperate with the knitting needles for knitting; compared with weft knitting machines such as flat knitting machines and sock machines, underwear knitting machines have 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 a seamless underwear machine, which enables the shuttle to have radial and axial movements.

[0007] The technical solution adopted by the present invention is as follows: the yarn feeding mechanism of the seamless underwear machine includes a shuttle, a cylinder and a piston, the front end of the shuttle is used to thread the yarn, and the piston is used to directly or indirectly push the shuttle; it is characterized in that: it also includes a crank, the crank is pivoted to the frame through a fulcrum, the front end of the crank is pivoted to the rear end of the shuttle, the rear end of the crank cooperates with the piston, and the piston pushes the rear end of the crank from bottom to top; a first connecting end is provided at the front of the crank, a second connecting end is provided at the front of the shuttle, and a first spring connects the first connecting end and the second connecting end; there is also a second spring at the rear end of the crank, and the direction of the elastic force of the second spring is opposite to the direction of the piston pushing.

[0008] The front end of the crank extends upward and backward to form a pivot point with the shuttle; the shuttle extends downward and forward to successively form a second connecting end and a front end for threading the yarn; below the front end of the shuttle is a working surface fixed relative to the frame and with a smooth surface.

[0009] In the height direction, the first connecting end and the second connecting end are both lower than the fulcrum of the crank.

[0010] Furthermore, let the fulcrum of the crank be A, the pivot point between the crank and the shuttle be B, and the second connecting end of the shuttle be C; during the entire working process, the angles between BA and BC are both obtuse angles.

[0011] The utility model also comprises a limit screw which is arranged at a position opposite to the piston, so as to limit the stroke of the rear end of the crank being pushed by the piston.

[0012] 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.

[0013] The shuttle involved in the above is a yarn-adding shuttle.

[0014] The working state of the present invention is as follows. When the piston pushes the rear end of the crank upward, the crank rotates around its fulcrum and the front part of the crank rotates downward; at this time, because there is no other external force, the front part of the crank, the shuttle and the first spring form a relatively stable spatial structure, and rotate downward together with the rotation of the crank; for the front end of the shuttle, it is far away from the fulcrum of the crank, and the arc formed by its rotation can be approximately regarded as a straight line of up and down movement, that is, at this time, the front end of the shuttle has a radial downward movement. After the above action is performed for a certain stroke, the front end of the shuttle hits the working surface, and the fixed working surface generates an upward supporting force on the front end of the shuttle, so that it cannot continue to move downward; at this time, the piston continues to push upward, and the front part of the crank continues to rotate downward, so that the pivot point between the front end of the crank and the rear end of the shuttle rotates, that is, the angle between the aforementioned BA and BC is widened, the first spring is stretched, and the front end of the shuttle slides on the smooth working surface, that is, radial movement is generated.

[0015] From the above analysis, it can be seen that the present invention can allow the front end of the shuttle to have axial and radial movements successively, 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-cylinder; 2-adjusting seat; 3-shuttle; 31-porcelain tube; 32-second connecting end; 4-crank; 41-first connecting end; 5-rivet pin; 6-axis pin; 7-first spring; 8-yarn guide plate; 9-second spring; 10-limiting screw; 11-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 a yarn adding shuttle 3 and a corresponding control mechanism.

[0022] Figure 2 The feeding mechanism of one of the yarn-adding shuttles is shown. The crank 4 is pivotally connected to the adjustment seat 2 at its fulcrum through an axle pin 6, and the adjustment seat is fixed to the frame and can also be considered as a part of the frame, so that the crank 4 can rotate around the fixed fulcrum.

[0023] At the rear of the crank 4, Figure 2 On the left side of the middle axis pin 6, there is a cylinder 1 at the bottom and an adjustment seat 2 at the top, and a piston 11 is arranged in the cylinder; a limit screw 9 and a second spring 10 extending downward are arranged in the adjustment seat, wherein the second spring 10 touches the rear part of the crank downward. When the piston 11 is pushed upward under the action of air pressure, it overcomes the elastic force of the second spring 10 and pushes the rear end of the crank to rotate upward until it is blocked by the limit screw 9; when the piston 11 retracts into the cylinder 1, the second spring pushes the rear part of the crank to reset it.

[0024] The front end of the crank 4 extends upward and backward; the front end of the shuttle 3 extends forward and downward, and the front end of the crank and the rear end of the shuttle are pivotally connected by a rivet pin 5; obviously, the position of the rivet pin 5 must be higher than the shaft pin 6. The front part of the crank has a first connecting end 41, and the front part of the shuttle has a second connecting end 32. The first connecting end 41 and the second connecting end 32 are both located lower than the shaft pin 6 and are connected by a first spring 7.

[0025] The front end of the shuttle 3 is provided with a porcelain tube 31 through which the yarn passes; below is a yarn guide plate 8, which has a smooth surface and constitutes the working surface of the yarn feeding mechanism, and will not hinder the movement of the yarn or the shuttle.

[0026] See also Figure 2 , Figure 3 . Figure 3 Point A is where the axle pin 6 is located, i.e., the fulcrum of the crank 4. When the piston 11 applies an upward vertical thrust F to the rear end of the crank 4, it forms a couple ω1 around point A, causing the crank to rotate around point A by an angle of θ1. At this time, the crank 4 and the shuttle 3 remain in a relatively stable state, so the front end of the shuttle 3 is displaced from point C to point C´, thereby achieving vertical displacement by a distance of H.

[0027] See also Figure 2 , Figure 4 . Figure 4 Point B is where the rivet pin 5 is located. The front end of the shuttle 3 has moved to the position that contacts the plane of the yarn guide plate 8 (i.e., C´). At this time, the piston 11 continues to act on the rear end of the crank 4 with a vertical thrust F. Since point C´ is blocked and cannot continue to move downward, the crank 4 drives the shuttle 3 to form a couple ω2 around point A, causing the rivet pin 5 (point B) to rotate around point A by an angle of θ2. When point B rotates to point B´, the BC´ movement is B´C", and the head of the yarn-adding shuttle 3 is horizontally displaced from point C´ to point C", thereby achieving horizontal displacement with a distance of S.

[0028] although Figure 3 Point B is not shown, but it cannot be seen that Figure 3 In the state of ∠ABC is an obtuse angle, and in Figure 4 In the figure, the angle ∠ABC is further increased.

[0029] When the piston 11 is reset, the first spring pulls the shuttle to restore its original angle; the second spring pushes the crank 4 and the shuttle 3 to return to their original positions.

[0030] As can be seen from the above description, in this embodiment, by controlling the piston, 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 seamless underwear machine includes a shuttle, a cylinder and a piston. The front end of the shuttle is used to thread the yarn, and the piston is used to push the shuttle directly or indirectly. The characteristics are: It also includes a crank, which is pivotally connected to the frame through a fulcrum, the front end of the crank is pivotally connected to the rear end of the shuttle, the rear end of the crank cooperates with the piston, and the piston pushes the rear end of the crank from bottom to top; a first connecting end is provided at the front of the crank, a second connecting end is provided at the front of the shuttle, and a first spring connects the first connecting end and the second connecting end; there is also a second spring at the rear end of the crank, and the direction of the elastic force of the second spring is opposite to the direction of the piston pushing.

2. The yarn feeding mechanism of the seamless underwear knitting machine according to claim 1, characterized in that: The front end of the crank extends upward and backward to form a pivot point with the shuttle; the shuttle extends downward and forward to successively form a second connecting end and a front end for threading the yarn; below the front end of the shuttle is a working surface fixed relative to the frame and with a smooth surface.

3. The yarn feeding mechanism of the seamless underwear knitting machine according to claim 2, characterized in that: In the height direction, the first connecting end and the second connecting end are both lower than the fulcrum of the crank.

4. The yarn feeding mechanism of the seamless underwear knitting machine according to claim 3, characterized in that: Assume that the fulcrum of the crank is A, the pivot point between the crank and the shuttle is B, and the second connecting end of the shuttle is C; during the entire working process, the angle between BA and BC is an obtuse angle.

5. The yarn feeding mechanism of the seamless underwear knitting machine according to any one of claims 1 to 4, characterized in that: The utility model also comprises a limit screw which is arranged at a position opposite to the piston, so as to limit the stroke of the rear end of the crank being pushed by the piston.

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