JPH03180521A - Initiation of automatic winding of yarn on bobbin - Google Patents

Abstract

PURPOSE: To precisely start the winding of a yarn on a bobbin by a simple device by reversely rotating the bobbin until a pressing finger reaches the wind- starting position at the neighbor of the bobbin when inserting the bobbin, reversing the revolution direction of the bobbin and bringing the starting end of the yarn into contact with the bobbin. CONSTITUTION: This method for automatically starting the winding of a yarn 1 on a bobbin 9 by allowing the yarn 1 to be guided by a flyer 2 having a pressing finger 4 urged by a lasting radial power, the starting end 12 of the yarn to be brought into contact with the bobbin 9 to be protruded from the pressing finger 4, and the bobbin 9 having the surface in a state keeping contact with the pressing finger 4 to be inserted to the wind-starting position within the range of the flyer 2 from the lower position, comprises rotating the bobbin 9 in the direction reverse to the winding direction while inserting the bobbin 9 until the pressing finger 4 reaches the wind-starting position near a bobbin leg part 10, and bringing the starting end 12 of the yarn guided by the pressing finger 4 into contact with the bobbin to start the automatic winding of the yarn 1 on the bobbin 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for starting winding of yarn on an empty bobbin when changing the bobbin in an automatic flyer spinning machine.

[Conventional technology]

It is already known in fryers to automatically replace all bobbins with empty bobbins. For this reason, it has been found that it is good to move the winding start position as close to the upper edge of the bobbin as possible.

As a result, when the bobbin is inserted into the rotation range of the flyer, when the pressing finger biased by spring pressure hits the bobbin, the starting end of the thread may fall off, or a large loop may be formed in the neck of the pressing finger that makes it difficult to start winding. The more formed, the more the starting end of the thread is prevented from coming out of the pressure finger lamina.

To assist in the start of winding, the bobbin usually has a winding start ring in the form of an area of high surface roughness near its upper edge (see DE 30 04 165).

However, bobbins made in this way have been found to be disadvantageous for ring spinning machines with automatic bobbin exchange. This is because when a bobbin is removed from the bobbin grid of a ring spinning machine and has almost started running, the remaining windings inevitably separate from the smooth surface of the bobbin, causing problems in bobbin replacement and the spinning process. This is because there is fear. It is advantageous here if the bobbin starts its winding close to the bobbin leg. However, such a bobbin cannot be used in the device in the above-mentioned German Patent Publication for the reasons mentioned above.

To solve this problem, a method and a device are proposed in German Patent No. 2838065. Here, the press finger of the flyer is located near the bobbin leg, the entire bobbin is pulled vertically out of the bobbin receiver, and the empty bobbin is inserted into the bobbin receiver in a detent manner. The fiber whiskers resulting from tearing off the thread in all bobbins protrude from the pressure finger and are caught between the bobbin leg and the bobbin receiver, so that winding of the bobbin is initiated at the bobbin leg.

[Problem to be solved by the invention]

The disadvantage of this system is that, because the flyer is in the above-mentioned position, it is extremely difficult to pull out all bobbins and insert empty bobbins. A further disadvantage is that the clamping of the fiber whiskers cannot be carried out reliably in any case, which can lead to malfunctions and make the machine very dirty.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for automatically starting winding of thread onto a bobbin, which allows a bobbin to start winding near the bobbin leg without requiring high costs.

[Means to solve the problem]

According to the invention, this purpose is achieved by guiding the yarn in a flyer with pressure fingers permanently biased with radial forces;
Automatic winding of thread onto a bobbin in which the starting end of the thread applied to the bobbin protrudes from the pressure finger, and the bobbin is inserted into the flyer from below to the winding start position with the pressure finger in contact with its surface. In the winding start method, the bobbin is inserted during its insertion until the pressure finger reaches the winding start position in the immediate vicinity of the bobbin leg.
This is achieved by rotating the bobbin in the opposite direction to the winding direction, after which the direction of rotation of the bobbin is reversed and the starting end of the thread guided by the pressure finger is applied to the bobbin. In that case, it is still advantageous if the circumferential speed of the bobbin is greater than the average speed of the bobbin stand during insertion into the winding start position.

According to the method according to the invention, the starting end of the thread guided in the pressure finger lamina is pushed laterally out of the contact area of the pressure finger with the bobbin by the rotation of the bobbin during insertion of the bobbin into the flyer rotation range. This allows the pressure finger to be moved without danger from the upper edge of the bobbin to the winding start position near the bobbin foot. Thereafter, by reversing the direction of rotation of the bobbin, the starting end of the thread is again moved between the pressure finger lamina and the surface of the bobbin and impinges thereon. Therefore, the first winding (start of winding) on the bobbin, which is the basis for forming the winding on the bobbin, is automatically performed. This provides important conditions for trouble-free bobbin exchange in ring spinning machines.

The method according to the invention can be carried out without additional mechanical means; it is only necessary to temporarily control the drive of the bobbin receiver.

〔Example〕

The present invention will be described in detail below with reference to embodiments shown in the drawings.

In FIG. 1, only the spinning station of a flyer spinning machine according to the invention for producing yarn 1 is shown. The spinning station includes a flyer 2 and a vertically movable bobbin table 7.
A bobbin receiver 8, which is arranged above and is rotationally driven, belongs thereto. The fryer 2 has a pressure finger (spring finger) 4 which is rotatably arranged in the fryer tube 3 and is permanently biased with a radial force, for example by a spring, which pressure finger 4 has, in particular, a horizontally extending pressure force. Finger neck 5 and pressing finger lamina 6 arranged at its tip
have.

Above the bobbin receiver 8 there is a bobbin 9 on which the thread 1 is wound, and the pressure finger lamina 6 is in contact with this bobbin 9. The bobbin 9 has, near its leg 10, a winding start ring 11 in the form of an area of high surface roughness. The yarn 1 to be wound up is guided in a flyer tube 3 and pressed against a pressure finger lamina 6.
is pressed against the bobbin 9 by.

When replacing the bobbin 9, the bobbin stand 7 is moved downward until the entire bobbin is out of the rotation range of the flyer 2.

The bobbin 9 is removed from the bobbin stand 7 and replaced with an empty bobbin 9. After that, the bobbin table 7 is used for winding.
is moved upwards again. That is, when the empty bobbins 9 are moved to the rotational range of the flyer 2, the pressing fingers 4 first come into contact with the surface at the upper edge of each bobbin 9 and slide downward on this surface.

However, in that case, as mentioned above, the starting end 12 of the thread 1 sandwiched between the bobbin surface and the pressure finger lamina 6 will be pushed upwards and form a large loop or will eventually end up in the pressure finger neck 5 There is a risk that the load may hang loosely (as shown by the broken line in Figure 1).

The method according to the invention overcomes this problem. In FIG. 2, the movement b of the pressing finger 4 is
is shown diagrammatically in relation to the rotational speed n and the bobbin height h. This ensures that while the bobbin 9 is moving into the winding start position, i.e. while the pressure finger lamina 6 is moving on the surface of the bobbin 9 from the upper edge to the winding start ring 11, the bobbin 9 is free for subsequent winding. The bobbin is rotated in the opposite direction (the direction of rotation of the bobbin is indicated by one symbol in FIG. 2). In that case, the circumferential speed of the bobbin surface should preferably be greater than the average speed of the upward movement of the bobbin stand 7. As a result, the starting end 12 of the thread 1, which is sandwiched between the bobbin surface and the pressure finger lamina 6, is moved laterally to such an extent that the vertical relative movement between the pressure finger lamina 6 and the bobbin 9 no longer produces the above-mentioned effect. The pincer is pushed out of range (illustrated in solid line in FIG. 1).

When the pressing finger 4 reaches the winding start ring 11, the direction of rotation of the bobbin 9 is reversed. With this, thread 1
The starting end 12 is drawn back into the clamping area between the bobbin surface and the pressure finger lamina 6, and a first winding is formed on the winding start ring 11. The subsequent winding process continues in a known manner.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of the fryer, and FIG. 2 is a diagram showing the movement of the pressure finger with respect to the rotational speed of the bobbin and the height of the bobbin. 1... Thread, 2... Flyer, 3... Flyer tube,
4... Pressing finger, 5... Pressing finger neck, 6
...Press finger thin piece, 7...Bobbin stand, 8...
Bobbin receiver, 9... bobbin, 10... bobbin leg,
10... Winding start ring, 12... Yarn starting end, b
...Movement of the pressing finger, h...Bobbin height, n...Bobbin rotation speed.

Claims (1)

[Scope of Claims] 1. The thread is guided by a flyer having a pressing finger to which a radial force is permanently applied, and the starting end of the thread to be applied to the bobbin protrudes from the pressing finger, and the bobbin is pressed against the surface of the flyer. In an automatic method for starting winding of thread on a bobbin, in which the thread is inserted from below into the area of the flyer up to the winding start position with the fingers in contact with each other, the pressure finger is inserted in the immediate vicinity of the bobbin foot while the bobbin is being inserted. The bobbin is rotated in the opposite direction to the winding direction until it reaches a winding start position located at , and then the direction of rotation of the bobbin is reversed, and the starting end of the yarn guided by the pressing finger is brought into contact with the bobbin. How to automatically start winding thread onto a bobbin. 2. The automatic winding start method according to claim 1, wherein the circumferential speed of the bobbin is higher than the average speed of the bobbin stand while the bobbin is inserted into the winding start position.