JPS6055608B2 - Fiber bundle drafting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fiber bundle drafting device in a textile machine.

A roving frame or a spinning frame having a roller draft device generally has a mechanism in which several top rollers are nipped under pressure to a bottom roller in units of two spindles using a weighting arm.

In particular, ring spinning machines can only be operated at low speeds, so the winding package is small and the spindle gauge is small, 100-1 or less. Therefore, the distance between the two spindles held by the weighting arm between the top rollers may be small, and the parallelism of the top rollers can be maintained sufficiently by the conventional weighting arm. but,
Innovative spinning machines that have been developed in recent years, such as binding spinning machines that produce spun yarn using swirling airflow,
The spinning speed is as fast as 100 m/min or more, and the winding package is also required to be large and cheese-like. For this reason, those with a wide spindle gauge, for example, a spindle gauge of 200Tf.
A gfl roller draft device is required. In the case of a wide gauge like this, a draft device in which an arbor having rotatable top rollers at both ends is gripped by a retainer with a built-in pressure spring that is slidably attached to the weighting arm is used. There is a drawback that the parallelism of the top roller to the roller cannot be maintained sufficiently, resulting in poor draft conditions. especially,
This phenomenon is remarkable in the front top roller, which rotates at a high speed. As a conventional method to overcome this drawback, for example, there is a method called the capper method in which the arbor of the top roller is extended to the outside of the top roller and hits a stopper provided at the position of the roller stand. Not only is it troublesome to adjust, but a pressing force of 20 to 9 or more is applied to the center of the arbor of the top roller, which causes the arbor to bend, making it impossible to obtain a uniform nip on the nip surface between the top roller and the bottom roller.

Furthermore, since the arbor is supported on both sides, there is a drawback that the operability is poor when guiding the fiber bundle to the drafting device or when lifting the weighting arm. Also, the width of the waiting arm is wide, making it very expensive to make a new one. The purpose of this invention is to solve the above-mentioned problems, to ensure the parallelism of the front top roller to the bottom roller, to apply pressure to obtain uniform surface pressure, and to use the conventional weighting arm almost as is. It is an object of the present invention to provide an inexpensive fiber bundle drafting device suitable for a wide gauge.

In this invention, the front top roller is individually supported by another swingable front top roller arm that is independent of the weighting arm, so that the front top roller can freely move toward and away from the front bottom roller, and the arm is held by the weighting arm. Pressure can be applied by pressing with a pressure member. Next, embodiments of the present invention shown in the drawings will be described.

FIG. 1 is a side view showing a draft device of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. In the drafting device 1, the front top roller 3 is rotatably attached to the tip of a front top roller arm 9 that swings around a fulcrum shaft 11 fixed with a set bolt 12 to a bracket 10 fixed to a part of the machine base. Supported.

A pressure spring for the weighting arm 2 is built into the retainer 5. A bracket 7 is fixed to a bar 6 held by the retainer 5, an adjustment bolt 8 is attached to this bracket 7, and the front top roller arm 9 is fixed with the adjustment bolt 8.
is pressed, and the top roller 3 is pressurized and nipped by the bottom roller 4 in units of two spindles. This. The position of the adjustment bolt 8 should be as close to the top roller 3 as possible, and the axis of the top roller 3 and the fulcrum shaft 11 should be parallel to the bottom roller 4, and the position between the swing arm 9 and the fulcrum shaft 11 should be It is necessary to keep the backlash to a minimum. The weighting arm 2 rotates about the support par 13 as a fulcrum, and rotates to the position indicated by the two-dot chain line when pressure is removed.

Furthermore, the top roller can also be separated from the bottom roller 4 as shown by the two-dot chain line. In the above embodiment, the front roller is simply a single roller, but another free-rotating roller is provided downstream of the front roller, and an apron band is wound between the front roller and the free-rotating roller. You can also do it like this. The front top roller configured as above can swing independently toward and away from the bottom roller, so parallelism to the bottom roller can be reliably maintained and pressure can be applied near the top roller. Therefore, the axial deflection of the top roller is small, so the pressure distribution on the nip surface can be made uniform.

For this reason, the gauge between the spindles is wide and the fiber bundle can be smoothly drafted even when rotating at high speeds, and the operability and stability are good, making it possible to wind up large packages.
Since it is only necessary to add a simple pressure member to the weighting arm, it is inexpensive and has high industrial value.

[Brief explanation of the drawing]

FIG. 1 is a side view of the draft device of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. 1: Draft device, 2: Weighting arm, 3: Front top roller, 4: Front bottom roller, 5:
retainer, 6: bar, 7: bracket, 8: adjustment bolt, 9: swing arm, 10: bracket, 11: fulcrum shaft,
12: Set bolt, 13: Support bar.

Claims (1)

[Claims] 1. A bottom roller group in which a plurality of actively driven bottom rollers are arranged in parallel, and a plurality of top roller groups corresponding to this bottom roller group, which are two weights, are attached to the frame so as to be swingable. In a fiber bundle drafting device which is rotatably supported on a book weighting arm so that a top roller group can be pressurized and separated from the bottom roller group via the weighting arm, the front top roller of the top roller group is The front top roller arm is supported by a swingable front top roller arm that is separate from the weighting arm, and the roller is able to come into contact with and separate from the front bottom roller of the bottom roller group, and the front top roller arm and the weighting arm are connected to each other. A fiber bundle drafting device characterized in that a front top roller and another top roller group can be simultaneously pressed and separated from a bottom roller group by freely joining and separating them.