JPS60252572A - Tension detector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tension spring from which an output signal can be extracted pneumatically.

Prior Art Such a tension detector is disclosed in West German Patent No. 283, for example.
It is described in the specification of No. 2930.

This tension detector is simply a thread monitoring device that detects the presence of thread (-1 and generates a positive or negative signal depending on the presence of thread).

Problems to be Solved by the Invention An object of the present invention is to be able to measure tension continuously;
Moreover, it is an object of the present invention to provide a tension detector which can constantly adjust the tension according to the tension and take out an analog output signal which advantageously changes linearly.

Means for Solving the Problem The means of the invention for solving the problem described above comprises a system which is pneumatic and is loaded with air at a preset constant pressure through a constriction. The thread communicates with the outside air via a nozzle and a tension-loaded closure, which is movable relative to this nozzle, and the pressure on the tangent is a measuring signal representative of the tension. be.

Embodiment The tension-loaded closure is preferably a bar spring fixed on one side, the bar spring being tension-loaded on one side of the free end and in contact with the nozzle on the other side. It has become. The bar spring is fastened in such a way that in the unloaded position, the bar spring forms a small gap with its free end to the nozzle.

The sensitivity of the system to vibrations can be reduced or completely eliminated by connecting an accumulator to the system.

For example, when a plurality of synthetic yarns are wound on one spindle, as is done in a spinning machine, it is necessary to control the rotational speed of the spindle in accordance with the yarn tension. For this purpose, provision is made according to the invention that a plurality of nozzle-closing body pairs are connected to the pressure system, each of which detects the thread tension. In this case, the pressure of the pressure system represents the average value of the tensions of all threads detected via the same system.

This average value is used to control the spindle rotation speed.

In the first embodiment, the thread 1 running in the running direction 2 is deflected from straight running by the thread guide 5 of the tension detector between the thread guides 3 and 4. For this reason, a force acts on the thread guide 5 in the direction indicated by the arrow 6. This force is transmitted to the bar spring 7. A bar spring γ is fixedly attached at one end and holds the thread guide 5 at the other end.

A nozzle 8 is arranged on the back side of the free end of the bar spring 7. The nozzle 8 is mounted in a stationary holder 9, in which it can be adjusted for axial displacement, for example by means of a screw thread 10. In this way, it is possible to adjust the gap width S of the gap between the head of the nozzle 8 and the free end of the rod-shaped spring 7 in an unloaded state, that is, when the thread tension has not increased. As will be described later, this gap width S is the width of the thread guide 5.
varies with thread tension due to the force in the direction indicated by arrow 6, which acts on .

Nozzle 8 is connected to a pressure system. The pressure system will only be shown briefly. The pressure system is supplied by a pressure source 11. The pressure p1 of the pressure source 11 is adjusted in advance and kept constant. Furthermore, a restriction is provided, by means of which the air flow rate is adapted to the outflow conditions of the nozzle.

The pressure system leads on the one hand to a nozzle 8, which is used as an outlet. The amount of air flowing out depends on the gap width S. The gap width S and also the thread tension depend on the force acting on the thread guide 5.

As a result, a pressure p2 is generated in the pressure system which is equal to the yarn tension. By pre-adjusting the pressure p1, pre-adjusting the throttle 12, pre-adjusting the gap width S in the no-load state, selecting the rod-shaped spring 7, and adjusting the span L, the pressure p2 governing the system can be linearly adjusted over a wide range according to the yarn tension. achieved. In any case, the pressure p2 and the thread tension are unique and stable (and dependent).The pressure p2 is
Pressure indicator 1 with calibrated measurement standard for thread tension
3. Additionally or alternatively, a pressure/electrical converter 14 may be provided, and the output signal of the pressure/electrical converter 14 may also be used for direct signal extraction. Alternatively, it may be processed in a data processing device or a control or regulation device.

Depending on the sensitivity to vibrations, provision is made to connect the pressure system to the accumulator 15 in the shunt. This also makes it possible to compensate for undesirable fluctuations.

It has been shown that the vibration behavior can also be improved by the shape of the bar spring, for example by making the bar spring 7 with narrow ends (see FIG. 6). by this,
The occurrence of unstable pressure cushions between the bar spring and the nozzle, which would lead to vibrations, is avoided. Alternatively, the bar spring can be perforated in the area of its contact surface with the nozzle 8 in order to avoid pressure build-up.

Second Embodiment FIG. 4 schematically shows a winding device for chemical fibers. Six threads 1 are wound onto each winding tube 20 by the spieldle 19,
Six bobbins 18 are formed. All winding tubes 20 are fixed to a common spindle 19.

The yarn runs in running direction 2 at a constant speed. The threads are deflected between thread guides 3 and 4 in each case by a thread guide 5 mounted on a rod-shaped spring γ. The thread then passes through a vertex thread guide 16, which constitutes the vertex of a so-called shift hexagon, and is shifted into a bobbin 18 by a reciprocating traverse thread guide 117.

The spindle is driven by an electric motor 21.

The thread tension of the thread diverted between the thread guides 3 and 4 is detected by a nozzle 8 in each case. Each nozzle 8 is connected to a common pressure system. This pressure system has a common pressure source 11
is supplied via an adjustable throttle 12 with a constant pressure D1, preset from . In this case, the pressure p2 takes a value representing the average value of the thread tensions of the six threads.

This pressure p2 is sent via the pressure/electrical converter 14 to the control device 22, which controls the driving rotation speed of the electric motor 21 so that the yarn winding speed and the average value of the yarn tension increase as the bobbin diameter increases. It is controlled so that it remains almost constant even when

Sixth Embodiment The tension detector according to the present invention can be used to control the tension of a thread or wire unwound from a bobbin, for example, in the production of thin steel ropes, so-called steel cords.

In order to achieve the high uniformity generally required for the final product, it is necessary to keep the tension in the wire feeding into the cage as constant as possible. To this end, it is necessary to equip the wire rod unwinding bobbin supported in the rotor with a bobbin brake that can influence the braking force by guiding the unwound wire rod through a dancer arm that acts on the brake. Are known.

However, the difference in diameter between a full bobbin and an empty wire bobbin is significant, which means that there is a correspondingly large difference in the required braking force that must be applied to maintain constant wire tension. means. In order to solve the technical problem caused by this, the tension detector according to the present invention is used as a member for controlling the pneumatic braking force with the bobbin brake acting on the unwinding bobbin in a wire stranding machine.
By detecting the tension in the unwound wire, a measurement or output signal proportional to the deviation can be provided.

This signal is used to supply compressed air for the pneumatic drive of the bobbin brake.

As mentioned above, the closing body can be constituted by a rod-shaped spring, and in this embodiment, the rod-shaped spring is used to receive the unrolled wire into the dancer roll. It must extend beyond the cooperating nozzle. However, the bar spring can also be fastened to a pivotable, one-armed or two-armed lever, preferably in the region of its pivot axis, which on the one hand is guided by a wire rod via a deflection guide roll. It is intended to be loaded by the tension exerted by the roots and, on the other hand, by a guiding force, preferably a constant guiding force, which counteracts the action of the wire loop.

The guiding force, which has a direction of action opposite to the tension in the wire loop, can be applied mechanically, such as by a spring, or pneumatically, using a compressed air drive loaded at constant pressure.

A closure in the sense of this specification is a holder of the impingement surface against which the air flow leaving the nozzle orifice hits.

The distance between the nozzle and the impact surface is variable depending on the force acting on the closure, but within the control range it should approach zero, but not be zero.

FIG. 5 shows an embodiment in which the tension detector according to the present invention is used to control the tension at which the wire is fed out. Feeding bobbin 3
The gamma ray material drawn out from 1 passes through a stationary direction changing guide roll 39 and travels on a dancer roll 40 fixed to a lever (swivel dancer arm) 41, forming a wire loop 44. 32 indicates the maximum payout diameter and 33 indicates the minimum payout diameter. A braking device (bobbin brake 35 and brake lever 36
) is now in effect.

The lever 41 is two-armed in this embodiment. Wire loop 4
4 acts on the lever arm 43 via the dancer roll 40, while the other lever arm 42 has a second
A compressed air drive 45,48 acts. The directions of action of the two forces are opposite to each other. A second compressed air drive 45,48 is supplied via a conduit from an air source. The air source provides an adjustable air pressure that maintains a regulated value. In this way, the second
The force of the compressed air drive is also kept at a regulated value.

The lever 41 moves to the second position in response to fluctuations in the tension of the wire loop 44.
against the constant force of the compressed air drive 45, 48, which causes an oscillating movement which is transmitted to the impact surface of the closing body 47. This also changes the distance between the nozzle 46 and the impingement plate of the closure 47 - in this way the pressure fluctuations caused by the
The pressure which is transmitted at the starting point 1 of the conduit 52 to the compressed air drive 37.38 of the first compressed air drive 37.38 and which is transmitted in this conduit 52 and which consequently acts on the first compressed air drive 37.38 constitutes a tension detector. According to the pressure fluctuations caused by the fluctuations in the distance between the nozzle 46 and the closure body 47. This means that the braking action changes accordingly.

Effects of the Invention By configuring the tension detector as in the present invention, a pressure representing tension is generated in the pressure system, and this pressure can be directly measured or transmitted via a pressure/electrical converter to a data output device, data It can be applied to a detection device, a data processing device, a controller, etc., and thus an analog output signal can be taken out which always changes according to the tension depending on the tension.

[Brief explanation of the drawing]

Figures 1, 2, and 6 show one of the tension detectors according to the present invention.
FIG. 4 is a diagram showing the embodiment as seen from different directions; FIG. 4 is a diagram showing another embodiment used in a winding device; FIG.
The figure shows a sixth embodiment used to control the tension of the wire rod. 1... Thread, 2... Running direction, 3, 4.5... Thread guide, 6... Arrow, 7... Bar spring, 8... Nozzle, 9...
・Holder, 10・Screw thread, 11・Pressure source, 12・Aperture,
13・Pressure indicator, 14・・Pressure/electrical converter, 15・
Accumulator, 16... Vertex thread guide, 17... Traverse thread guide, 18... TI Kubin, 19... Spindle, 20... Winding tube, 21... Electric motor, 22... Control device, 31... Payout Bone, 32... Maximum diameter, 33 - Minimum diameter, 34. Brake drum, 35...
Bobimp [/-ki, 36...brake lever, 37.
38...Compressed air drive device, 39...Direction change guide roll, 40.Dancer roll, 41-...Lever, 42.4
3... Lever arm, 44... Wire loop, 45.
48... Compressed air drive device, 46 - Nozzle, 47...
- Closed body, 49.50.51... Air source, 52. 54
．． 55° 56... Conduit, 53... Nozzle, 58.
59... Rotation axis. Continuation of page 1 Priority claim 01984 June 15 [phase] West Germany (f
fW light person Hermann Bremer DE) [phase]
P3422308.8

Claims (1)

[Claims] 1. A tension detector capable of outputting an output signal pneumatically, having a pneumatic system loaded with air at a constant pressure adjusted in advance through a throttle, The core system communicates with the outside air via a nozzle and a tension-loaded closure, which is movable relative to the nozzle, and the pressure of the core system is a measurement signal representative of the tension. A tension detector characterized by: 2. The closure body is part of a bar spring fixed on one side;
A tension detector according to claim 1. 6. The tension detector according to claim 2, wherein a gap is formed between the closing body and the nozzle when the bar spring is in an unloaded state. 4. The tension detector according to any one of claims 1 to 6, wherein the pressure system includes an accumulator. 5. Tension detector according to claim 1, wherein the pressure system comprises a plurality of nozzle closures, each loaded by a thread. 6. A member (40~
As 47), a measurement signal or an output signal proportional to the deviation by detecting the tension of the built-up wire rod (44) is transmitted to the pneumatic drive device (37) of the bobbin brake (35).
2. The tension detector according to claim 1, wherein the tension detector is configured to provide compressed air for supplying compressed air. 7. A wire roof '( 44) Nodame Dancer Roll (4)
0), the tension detector according to claim 6. 8. A closure body (47) is fixed to a pivotable lever (41) and a dancer roll (4) fixed to the nuclear lever.
0), the tension of the unwound wire rod and a guide force having an action direction opposite to this tension act on the lever (41), and 7. Tension detector according to claim 6, wherein a pivoting movement that changes the distance between the nozzle (46) and the closure body (47) influences the output signal. 9. The tension detector according to claim 8, wherein the guiding force is provided by a tension coil spring or a compression coil spring. 9. Tension detector according to claim 8, wherein the id force is provided by a compressed air drive (45, t8) loaded with constant pressure. 11 The closing body (47) is connected to the pivot shaft (59) of the lever (41).
), the tension detector according to any one of claims 8 to 10. 12. A dancer arm (41) configured as a two-armed (42, 43) lever holds the closure body (47) in the immediate vicinity of the pivot axis (59), one arm (42) being driven by compressed air. The other arm (43) is loaded with a constant force provided by the device (45, 48) and is fed from the unwinding bobbin (31) via a stationary deflection guide inner roll (39). 12. The method according to claim 1, wherein the dancer roll (40) is fitted with a wire loop (44) guided on the dancer roll (40). Tension detector.