JPH0151568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an improvement in a synthetic fiber draw-twisting machine.

[Prior art and its problems] When drawing synthetic fibers, it has been widely adopted to apply preliminary tension between a supply roller and a heated supply roller, and then draw the synthetic fiber between the heated supply roller and the drawing roller. There is.

In such an apparatus, when the winding bobbin is fully wound, a stopping method is adopted in which the drive of the drawing roller system is cut off, and later the heating supply roller is forcibly braked to control the needle thread length. For this reason, when the heating supply roller is braked, the yarn becomes slack between the heating supply roller and the supply roller, and the yarn path on the heating supply roller is disrupted, causing the yarns to overlap and stop. .

For this reason, when the operation of the drawing/twisting machine is restarted, the yarn often comes off from the heating supply roller or gets wrapped around the drawing roller and breaks.

[Object of the Invention] The present invention has been made to solve these problems, and provides a drawing-twisting machine that does not cause yarn breakage when the next operation is restarted.

[Structure of the Invention] That is, the present invention provides a drawing and twisting machine equipped with a heated supply roller, which is provided with a supply roller partially provided with a satin finish upstream of the heat supply roller, and a nip roller formed by pressing the supply roller, This drawing/twisting machine is constructed by reducing the diameter of a nip roller at a position corresponding to the satin-finished portion of the supply roller, and further providing a yarn moving device upstream of the supply roller for changing the yarn path in the axial direction of the supply roller.

The present invention will be explained below based on the drawings.

FIG. 1 is a schematic diagram of a draw-twisting machine showing one example of the present invention. 1 is an undrawn yarn package, 2 is a guide moving device, 4 is a step-processed knit roller, 5 is a partially satin-finished supply roller, 6 is a heated supply roller, 7 is a hot plate, 8 is a drawing roller, 9 is a label guide, 10 is a traveler, 11 is a ring holder, 12 is a ring rail, 13 is a waist spool, 14 is a spindle, and 15 is a package.

The normal operating conditions of the draw-twisting machine of the present invention are as follows. The yarn Y unraveled from the undrawn yarn package 1 passes through the guide 2, is pressed by the large diameter part of the nip roller 4, and passes from the supply roller 5 to the heated supply roller 6, where it is given preliminary tension and further heated. The stretching roller 8 is heat-treated while contacting the plate 7.
The film is wound around the film, and stretching is performed during this time. Further, the yarn Y passes through the rappet guide 9 and the traveler 10, and is wound onto a bobbin fitted to the spindle 14 to form a burn.

The case where winding is stopped is as follows. When a predetermined amount of yarn has been wound onto the bobbin and the ring reaches the upper folding position, the motor driving the drawing roller system is switched off, and the drawing roller system begins to rotate by inertia, causing the ring to rise. and stop. Then, as a bunch begins to be formed at the upper end of the bobbin, the guide moving device operates in the direction A, moves the yarn from the large diameter portion of the nip roller 4 to the small diameter portion, and then stops. As a result, the yarn loses its pretension. Since the yarn passes through a portion N where the surface of the supply roller is partially satin-finished, it is supplied by the heated supply roller.

Furthermore, the ring is suddenly lowered, and after a certain period of time, a brake is applied to the shaft of the heating supply roller to control the needle thread length. At this time, since the yarn is removed from the knit roller on the supply roller, there is no disturbance of the yarn on the heating supply roller. The ring moves to the lowest end and starts a minute traverse at the waist spool position to start wrapping around the waist, and the stretching roller system comes to a complete stop.

On the other hand, when the winding pirn is removed, a new bobbin is fitted, and the operation is restarted, the procedure is as follows. Except that the yarn Y is passed through the small diameter portion of the knit roller and the matte portion N of the supply roller, the yarn Y is kept on the same thread path as during operation up to the waist spool.

When the start switch is turned on, the ring starts a minute traverse at the waist spool position, the drawing roller system starts rotating at low speed, and after a certain period of time, the guide moving device operates in direction B, and the yarn is drawn from the small diameter part of the nip roller 4. is moved to the regular position of the large diameter portion, and is pressed and supplied by the supply roller and the nip roller, and preliminary tension begins to be applied between the supply roller and the heated supply roller. After this, when the simultaneous start switch is turned on, the drawing roller system increases to a predetermined rotation, and then the ring rises and begins to wind the yarn around the bobbin.

FIG. 2 is a perspective view showing an example of a preferred nip roller in the present invention. Although the boundary between the large diameter portion L and the small diameter portion S may be perpendicular to the axis, it is preferably tapered in order to alleviate sudden loading and release of yarn tension. Furthermore, the shoulder edge R
It is more preferable to provide a notch V in a part of the groove because the yarn can be transferred more smoothly.

[Effects of the Invention] According to the improved drawing and twisting machine of the present invention, the tension between the supply roller and the heating supply roller can be adjusted.
There is no longer any thread breakage when stopping and restarting operation.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one example of the present invention. FIG. 2 is a perspective view showing an example of a preferred nip roller in the present invention. 1: Undrawn yarn package, 2: Guide, 3: Guide moving device, 4: Nip roller, 5: Supply roller, 6: Heating supply roller, 7: Hot plate, 8: Stretching roller, 9: Rappet guide, 10: Traveler, 1
1: Ring holder, 12: Ring rail, 1
3: Waist spool, 14: Spindle, 1
5: Package cage, Y: Yarn, N: Satin portion of supply roller.

Claims (1)

[Claims] 1. In a drawing-twisting machine equipped with a heating supply roller, a supply roller partially provided with a satin-finished portion is provided upstream of the heating supply roller, and a knit roller formed by pressing the supply roller is provided, and the knitting roller is provided to correspond to the satin-finished portion of the supply roller. A drawing/twisting machine which reduces the diameter of a nip roller at a position and further includes a yarn moving device upstream of a supply roller that changes the yarn path in the axial direction of the supply roller.