CS233138B1 - Equipment for mainshaft shift control - Google Patents

Abstract

The purpose of the invention is to provide a simple method that allows the machine operator to reach any position of rotation of the main shaft of the machine with sufficient speed and accuracy. This is achieved by an electronic impulse device without feedback controlled by a button that activates the machine's power element - for example, an electromagnetic clutch or an electric motor. The activation time of the power element is proportional to the time the button is pressed, while the electronic impulse device without feedback has an adjustable maximum activation time of the adjustment element. When the button is pressed for a time shorter than the maximum activation time setting, the activation time is proportional to the time the button is pressed, but the electronic impulse device provides a certain fixed minimum activation time of the machine's power element.

Description

BACKGROUND OF THE INVENTION The present invention relates to the control of rotation of the main shaft of a textile machine during operation and adjustment.

When operating and adjusting the weaving machine, it is necessary to allow any rotation position of the main shaft to be achieved with sufficient speed and accuracy. According to the state of the art, this requirement is addressed either by an electronic feedback circuit to stop the weaving machine after reaching the desired position or the weaving machine is equipped with a device for slow operation of the weaving machine so that the operator is able to stop the machine in the desired position. Both of these solutions are complex and expensive, and the object of the invention is to find a simpler and cheaper solution.

The object of the invention is achieved by a device for controlling the rotation of the main shaft of a weaving machine, consisting of an electronic part, a control button and a power element according to the invention, the principle being that. the electronic portion comprises an electronic pulse device without external feedback and a semiconductor switch, wherein the electronic pulse device is a monostable flip-flop with an adjustable output pulse length and a circuit for tripping the semiconductor switch when the input pulse is lost.

The main advantage is a simple solution without the need to use sensors for sensing the position of the main shaft or slow machine operation. This simplicity of the solution, as a further advantage, makes it possible to equip the weaving machines previously produced without much intervention in the construction of the weaving machine.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A illustrates an exemplary schematic drawing of an improved variant of the invention and its relationships.

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The power source χ is supplied from the source χ, for example by an electromagnetic clutch. The button χ is connected to the input of an electronic pulse device 2 comprising a monostable flip-flop circuit χ with adjustable output pulse length by means of the adjusting element 2, a circuit for switching off the semiconductor switch 2 and its own semiconductor switch 6 for example a thyristor.

In order to improve the operation of the device with respect to the lifetime of the semiconductor switch circuits and the mechanical part of the device, another electronic flip-flop 8 is connected in the electronic pulse device 2, with a fixed fixed output pulse length. The device operates as follows: An executive element χ, for example, an electromagnetic clutch is supplied from a source χ via a semiconductor switch 6. At the push of a button χ, the monostable flip-flop χ generates a control pulse for the semiconductor switch 6 eg thyristor or transistor a_pod. The length of the pulse can be adjusted by the adjusting element 2 * the monostable flip-flop χ together with the circuit for switching off the semiconductor switch 2 will interrupt the current to the power χ. If the X button is released before the set time has elapsed, the current passing through the power element not shown (not shown) at the moment the χ button is released. Thus, it can be achieved that the machine operator can activate the power element χ for a predetermined period of time according to the magnitude of the maximum desired rotation without the risk of the main shaft rotating over the desired position by combining the adjusted rotational time and correspondingly pressing the χ button. A further improvement of the effect of the device is achieved by placing another electronic flip-flop 8 in the electronic pulse device 12, which has a fixed fixed output pulse length which is substantially shorter and ensures a minimum activation time of the power element χ at any short press. during the period when switching effects are induced, which positively affects the service life of the mechanical and electrical parts of the machine.

Claims (2)

SUBJECT OF THE INVENTION An apparatus for controlling the rotation of a main shaft of a weaving machine comprising an electronic part, a control button and a power element, characterized in that the electronic part comprises an electronic pulse device (2) without external feedback and a semiconductor switch (6), / consists of monostable flip-flop circuit (4) @ adjustable output pulse length and circuit for switching off semiconductor switch (9) when input pulse disappears * Device according to claim 1, characterized in that the electronic pulse device (2) comprises another other electronic flip-flop (8) with a fixed fixed output pulse length #