JPH0241410A - Method for threading in spun yarn winder - Google Patents

Abstract

PURPOSE:To facilitate threading also in the case of weak fiber yarn by carrying out threading motion while placing a dancer roller at a position lower than that of a pulling-out roller and gradually moving the dancer roller upward after threading. CONSTITUTION:A spun yarn a is pulled out while placing a dancer roller 2 at a position lower than that of a pulling-out roller 1 and subjected to threading through the lower part of the pulling-out roller 1 on the dancer roller 2 and wound through a traverse device to either one bobbin. After threading, a spindle 3 is accelerated and the dancer roller 2 is gradually moved upward to upper limit position at a point of time when wind-up speed attains speed equal to take-up speed of yarn by the pulling-out roller 1. After returning to normal wind-up operation state, the traverse device 5 is moved from the bobbin 4 side to the bobbin 4' side to transfer the yarn a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for initial winding of yarn in a double-headed spindle-driven yarn winding machine.

(Prior art) A technique in which the yarn is taken up by a pull-out roller and wound onto a double-headed spindle-driven yarn winding machine via a dancer roller is proposed by the present applicant in Japanese Patent Laid-Open No. 63-7652.
It is disclosed in Publication No. 77.

In this case, the dancer rollers are controlled so that the dancer rollers act slowly as the yarn layer increases after the start of winding, without the dancer rollers acting on the yarn. In the winding operation, when one spindle is fully wound, the traversing device is moved at the normal winding speed to transfer the yarn to the other spindle, making continuous winding possible.

(Problems to be Solved by the Invention) In the conventional means described above, the speed of the pull-out roller and the dancer roller is controlled according to the initial winding speed of the take-up spindle, thereby preventing the thread from being cut when the thread is hooked. However, since the yarn immediately after spinning is brittle and has some viscosity, the initial threading is sometimes difficult when the thread is hung from the pull-out roller, through the dancer roller, and onto the spindle. When the yarn take-up speed becomes slower than the yarn take-up speed of However, there was an inconvenience that threading was impossible.

(Means for Solving the Problems) In view of the above, the present invention simplifies the initial thread winding when winding fragile thread that is easily cut, and facilitates continuous thread winding work using a double-headed spindle-driven thread winding machine. The yarn is taken up by a pull-out roller and then wound by a double-headed spindle-driven yarn winding machine via a dancer roller. By setting the dancer roller at a lower position than the pull-out roller and reducing the winding angle of the yarn around the pull-out roller, the yarn pulling action by the pull-out roller is reduced and the yarn is hooked, and the yarn hook is gradually moved to the upper limit of the rear dancer roller. The present invention is characterized in that by moving the yarn up to the position, the winding angle of the yarn around the pull-out roller is increased, and the yarn is wound while the pull-out roller normally exhibits the yarn take-up action.

(Function) In the present invention, the initial thread hanging in the winding operation is carried out by supporting a dancer roller which is movable up and down at a lower position than the pull-out roller, and the thread pulled out from the pull-out roller is transferred to the dancer roller at the lower position. - Since the thread is wound around the spindle via the roller, the length of the thread that comes into contact with the circumferential surface of the pull-out roller is reduced, and therefore the pulling action of the thread by the pull-out roller is significantly reduced, and depending on the direction of the thread being pulled from the pull-out roller, Even if the thread is loose or viscous, it will not wind around the pull-out roller, making it easy to thread the thread.The thread will be wound onto the bobbin on the spindle until the spindle rotation reaches the normal winding speed, and the thread will be wound normally. When the speed is reached, the dancer roller is gradually moved up and the winding thread is transferred to the bobbin on the other spindle by the traversing device, and normal winding is continued. During this time, the thread wound on one bobbin is When the bobbin to be wound is fully wound, the thread is moved to the other bobbin, which is repeated to perform continuous thread winding work.

(Example) An example of a double-headed spindle-driven yarn winding machine for carrying out the method of the present invention will be described with reference to the drawings.

In the drawings, (1) is a pull-out roller driven by a servo motor, (2) is a dancer roller, and (3) is a pull-out roller driven by a servo motor.
') is a spindle that is installed as a double-headed type, and the thread is wound onto the bobbins (4) (4') inserted into each spindle, and when one bobbin (4) is fully wound, the thread is automatically wound. Move the traversing device (5) to transfer the thread to the other bobbin (4') and wind it continuously, and for the fully wound bobbin, turn over the spindle support arm (3a) as shown in Figure 1. and replace it with a new bobbin.

The dancer roller (2) is mounted on a shaft (
2a) and is moved up and down in response to changes in tension in the winding yarn. The elevating frame (6) is arranged to be moved up and down by rollers (7) according to a pair of fixed guides (8), and during normal winding, the pull-out roller (1) is moved as shown by the solid line in FIG. The vertical movement of the lifting frame (6) is controlled by the fixed guides (8) on both sides.
The upper end of a rack rod (IO) that is fixedly attached to the frame (8) or moved up and down by a near motor (9) is tied to the lifting frame (6), and is moved up and down at the appropriate time by starting the motor (9).

In addition, the upper limit position is the protrusion provided at the bottom of the rack rod (10).
is regulated by acting on a limit switch S1, and stopping at the downward position, which will be described later, is regulated by a projection L2 provided on the upper side of the rack rod (IG) acting on the switch S2.

In the above apparatus, when the dancer roller (2) is supported at the upper limit position as shown by the solid line in FIG. The rotation of (1) accurately takes up the yarn a, and the dancer roller (2) absorbs the slack while winding the yarn onto the bobbin (4) with a constant tension. When the yarn is fully wound, it is known that Move the traversing device (5) using the means described above to transfer the thread to the other bobbin (4') installed in parallel and continue winding it, then turn the fully wound bobbin (4) over and replace it with a new bobbin. , this is repeated to perform a continuous winding operation.

Next, the initial thread hooking operation at the start of winding is carried out by the motor (9
) to stop the lifting frame (6) at a predetermined lowering position via the rack rod 00 and support it at a position lower than the drawer opening (1) as shown in FIG. spun yarn a
is passed through the lower part of the pull-out roller (1) to the low-position dancer roller (2), and then wound around one bobbin (4) through the traversing device (5); in this case, the pull-out roller (1) ) is the direction in which the yarn is taken from the roller (1
), and the contact length of the thread a with the pull-out roller (1) is small, so even if the thread is loosened, slippage may occur at the contact area of the thread, so depending on the viscosity of the thread, the length of the contact of the thread a with the pull-out roller (1) is small. (1) The thread does not wind around the thread, which prevents the thread from breaking during threading, and threading becomes easy.

After threading is finished, the spindle (3) is controlled so that the speed gradually increases from low speed, and the winding speed is adjusted to the pull-out roller (
When the yarn take-up speed becomes equal to the yarn take-up speed according to step 1), the dancer roller (2) is gradually moved upward to the upper limit position by the drive of the motor (9), and the contact length of yarn a with (1) is adjusted by the pull-out roller. After increasing the winding speed to bring about the normal winding operation, move the traversing device (5) from the bobbin (4) side to the other bobbin.
4') side to transfer the thread a, and then winding the thread on the bobbin (4') using the normal winding operation.

In addition, the above-mentioned thread hook is controlled by an adjustment panel for starting and stopping the drive motor (9) of the dancer roller (2), regulating the speed of the spindle (4) (4'), and moving the traversing device (5). 11v.

(Effects of the Invention) According to the present invention, the dancer roller is provided so as to be movable up and down, and the dancer roller
Since the roller is supported at a low position relative to the pull-out roller and the spun yarn is hung from the pull-out roller to the dancer roller at the low position, the threading operation is extremely easy.
In addition, the length of the thread in contact with the peripheral surface of the pull-out roller is small, and the thread is pulled out from the bottom surface of the pull-out roller in a direction away from the side. , the thread is not wound around the pull-out roller and cut by the rotation of the roller, thus making threading easier even in the case of fragile fiber threads, and after thread threading is completed, the dancer roller can be used during normal winding operation. It is used as the upper moving position of the winder, and has the effect of facilitating continuous winding work by mutually rewinding with a double-headed spindle-driven winder.

[Brief explanation of the drawing]

The drawings show an embodiment of a double-headed spindle-driven winding machine, with FIG. 1 being a partially cutaway side view and FIG. 2 being a front view. (1)...Drawer roller (2)...Dancer roller (3) (3')...Spindle (4) (4')
... Bobbin (5) ... Traverse device (6) ...
・3 outside the lift frame

Claims (1)

[Claims] In this device, the yarn is taken up by a pull-out roller and then wound by a double-headed spindle-driven winding machine via a dancer roller.The supporting position of the dancer roller is provided so that it can be raised and lowered freely, and when threading, the dancer roller is moved from the pull-out roller. By reducing the winding angle of the thread with respect to the pull-out roller in the low position, the yarn pulling action by the pull-out roller is reduced, and the thread is threaded. A method for threading a thread in a spinning and winding machine, which is characterized in that the winding angle of the thread is increased to allow a pull-out roller to normally exhibit a thread take-up action.