JPH04251078A - Yarn tension adjusting device - Google Patents

Abstract

PURPOSE: To provide a yarn tension adjusting device which ensures a uniform yarn tension and smooth yarn running over an entire length of the yarn to be wound on a spool, and which can attain a spool arrangement appropriate and uniform for the shape of the spool during wind-up of the yarn into the spool. CONSTITUTION: A yarn tension adjusting device comprises a spiral spring 11 resisting a yarn tension and applied with an initial stress, a yarn probe 8 movably held on a bottom base part 11, and serving as a sensor for detecting a yarn tension and as a yarn length compensator, and a yarn braking device which can be electrically controlled in accordance with a position of the yarn probe 8. The initial stress of the spiral spring can be changed by programmable controllers 12 to 20, and the tension of the yarn is adjusted thereby.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a device for detecting thread tension, which has a helical spring given an initial stress that acts to resist the tension of the thread, and is movably held at the base of the spring. a yarn probe element that acts as a sensor and as a yarn length compensator; The present invention relates to a yarn tension adjustment device for a yarn that is lap-wound by changing both or one of the yarn tension and speed in a traverse winding machine, and having a certain yarn braking device.

0002

BACKGROUND OF THE INVENTION Such a thread tension adjustment device is known from German Patent Specification No. 32 41 362. In this case, the reciprocating movement of the yarn probe is detected by a non-contact switch, such as a Hall element, evaluated by an electronic regulation circuit and used to control an electromagnetically acting yarn brake. . The yarn brake, controlled by an electronic regulation circuit, holds the yarn probe lever at the average value of the runout region, thereby balancing the yarn initial stress and the yarn pulling tension created on the front spool due to friction and the pulling force of the yarn withdrawal. The balance between is adjusted.

The reaction force of the helical spring can be controlled by changing the yarn braking force to move or adjust the point of action of the helical spring on the base while keeping the deflection area of the yarn probe at the same position. adjusted by.

As is known, a spool consists of a number of superimposed yarn layers which are formed on a cardboard or plastic bobbin by varying the movement of the yarn guide while rotating the spool. The goal is to maintain uniform thread tension and smooth thread running over the entire length of the thread wound onto the spool during redrawing. The spool layers must remain reliably bound and the spool must retain its shape even during vibration.

As is evident in practice, several parameters change within the spool during its formation. For example, the base layer of yarn (the outermost yarn layer on which the next layer of yarn is wound) is stiff due to the bobbin surface at the beginning of the winding process and becomes softer as the spool diameter increases. As a result, for a spool of the desired stiffness, the outer layer squeezes the layer below it and also displaces it axially, creating a bowed front and/or concave surface on the spool pack. .

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned type of thread tension adjustment device so as to eliminate the above-mentioned drawbacks and to produce a spool with a proper shape and uniformity when winding the spool. The goal is to achieve structure.

[0007]

The above-mentioned problem is solved in that the initial stress of the helical spring is made variable by means of a programmable adjustment device.

Further preferred embodiments are achieved by the dependent claims.

By combining the proven thread tension adjustment with a programmable thread tension adjustment device according to the invention, the thread tension is changed in a program-controlled manner during the winding process. The thread tension can be given in absolute or relative values at the winding position operator console, which is not available in conventional winding position manual devices. Adjustment and programming of the individual winding positions can preferably be performed by a central processing unit, and the same adjustment value can be set for a plurality of winding positions.

0010

Embodiments Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0011] For thread tension adjustment in a twill winder, the thread 1 is unwound from a front spool 2 and wound onto a conical twill spool 3. The twill spool 3 is propelled (forward and backward) while rotating around its axis, and the yarn guide 4 guides the yarn axially in the direction of the twill spool 3 so as to form a twill winding pattern. In the region of the front spool 2, the thread 1 runs frictionally guided on an electrically controllable thread brake 6 which provides a constant thread tension. The thread 1 coming out of the thread braking device 6 passes through a guide roller 7 and a roller 9 bearing on the end of the probe lever 8.
It travels to the thread guide 4 which reciprocates.

The yarn probe lever 8 is rotatably journaled on the base 10 and biased by a helical spring 11 so that the roller 9 of the yarn probe lever 8 pulls the loop of the yarn 1.

The roller 9 is connected to the thread braking device 6 and the helical spring 11.
It moves in the direction of the arrow around the center position determined by the reaction force. The braking torque of the yarn braking device 6 is reacted by the permanent magnet 21 on the yarn probe lever 8, and two Hall elements H1 and H2 that operate in a non-contact manner ensure that the center position of the roller 9 remains at the same position. be adjusted. Up to this point the invention is related to German Patent Specification No. 32 41 362.

According to the invention, the reliable thread tension adjustment described above is combined with a programmable thread tension adjustment device. In this case, the free end of the helical spring 11
1 and an annular member serving as a housing 12 for the housing 12. The base 10 is rotatable about the axis of the longitudinal axis of the helical spring.
A wire rope 13 is wound around the spring housing 12, which is supported by a bearing, and is fixed to the spring housing 12 by means of a fixing means 12a. wire rope 1
The free ends of 3 are led to rope drums 14 and 14a on a common shaft 15. Connect the end of the rope to drums 14 and 1
By winding in opposite directions on 4a, the common shaft 1
5, in each case one rope end is uncoiled and another wire end is wound up, so that the spring housing 12 is rotatable in two directions and resists reaction forces in both directions of rotation. By pulling the rope, the spring housing 12 is fixed.

The rotary movement of the common shaft 15 with the two rope drums 14 and 14a is effected by a motor 16 with the aid of an associated transmission 17. At the free end of the common shaft 15 a position detector 18, for example a potentiometer, is provided, by means of which the position of the rope drums 14 and 14a and thus of the spring housing 12 is connected to the central processing unit 20 of the computer. The controller 19 is notified. The electronic regulator issues "run commands" to the motor 16 until the target setpoint and current position match.

The embodiment of the spring housing 12 with the wire rope 13 is a space-saving and low-cost embodiment. The easy hanging and unhooking of the wire rope 13 ensures easy disassembly and assembly.

The invention is not limited to the exemplary embodiments shown and described, but many modifications are possible within the scope of the invention.

In another embodiment, the spring housing can also be designed as a worm gear and the drive can be provided by a motor and a worm. Furthermore, it would also be possible to provide the spring housing as the last gear in a multi-gear transmission mechanism.

[Brief explanation of the drawing]

FIG. 1 shows a preferred embodiment of the invention.

[Explanation of symbols]

1 Thread 2 Front spool 3. Twill spool 4 Thread guide 6 Thread braking device 7 Guide roller 8 Thread probe lever 9 Roller 10 Base 11 Spiral spring 12 Spring housing 12a Fixing means 13 Wire rope 14 Rope drum 14a Rope drum 15 Common axis 16 Motor 17 Transmission mechanism 18 Position detector 19 Adjuster 20 Central processing unit

Claims (3)

[Claims] Claim 1: A sensor for detecting thread pulling tension, which has a helical spring that is given an initial stress that acts to resist thread pulling tension, and is movably held at the base.
and a yarn probe element acting as a yarn length compensator, and a yarn in the yarn running path in front of the yarn probe element, which can be controlled via an electrical adjustment device depending on the position of the yarn probe element. In a yarn tension adjustment device for yarn that is lap-wound by changing both or one of the yarn tension and speed in a traverse winding machine and having a braking device, the initial stress of the helical spring (11) is changed. A thread tension adjustment device, characterized in that it has a programmable adjustment device (12-20) capable of 2. The helical spring (11) is journaled at one end in the thread probe element (8, 9) and at the other end in a spring housing rotatably journaled about the axis of the longitudinal axis of the helical spring (11). (12), and the rotational movement of the spring housing (12) is controlled by the adjustment mechanism (16, 17).
3-15) The thread tension adjustment device according to claim 1, characterized in that it is executable in the opposite direction via 3-15). 3. Thread tension adjustment device according to claim 1, characterized in that the drive mechanism (16, 17) is controllable by an adjustment electronic circuit (18-20).