CZ260094A3 - Device for controlling loom working speed - Google Patents

Description

Device for controlling the working speed of the state

MP-1972-94

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Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a state operating speed control device comprising a main induction motor coupled to a flywheel, a clutch for connecting a flywheel to a main shaft, a brake for stopping the main shaft and a logic unit for controlling the main induction motor, clutch and brake.

BACKGROUND OF THE INVENTION

The movement of the main shaft of the state is derived, via the clutch; from the flywheel being driven to the operating speed of rotation by the main induction motor controlled by the control logic unit. To achieve a 'slow or reverse run', the state generally uses an auxiliary motor which is controlled by said logic unit so that the state is in operation at reduced operating speed or in reverse by means of reverse elements.

In addition to having a large overall size and costly due to the need for additional elements and a second motor, such an arrangement does not make it possible to make desired changes to the working speed of the loom for special weaving or to eliminate weaving errors due to an inappropriate increase in working speed.

SUMMARY OF THE INVENTION It is therefore an object of the invention to overcome the above-mentioned disadvantages and to provide a control device for optimizing the operating speed of the state in all its functional phases without the need for an auxiliary motor and auxiliary elements.

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SUMMARY OF THE INVENTION

This task is accomplished by a state-of-the-art speed control device comprising a main induction motor connected to the flywheel, a clutch for connecting the flywheel to the main shaft, a brake for stopping the main shaft and a logic unit for controlling the main induction motor, clutch and brake. According to the invention, the essence is that the logic unit controls the main induction motor via a phase reverser frequency converter.

In this way, the rotation speed of the main induction motor can be changed by the logic unit as desired by simply changing the output frequency from the frequency converter, the reverse operation being achieved by reversing the phase of the frequency converter.

In this way, the generally desired increase in the 'rotational speed' of the main induction motor and consequently the state as well as the automatic reduction of this rotational speed for the special fabric workstations determined by said logic unit using suitable sensors is readily and immediately achieved.

The advantage of the device according to the invention is that by acting directly and exclusively on the main induction motor of the state, not only a smooth, efficient and simple adaptation of the working speed of the state to the desired values (normal or slow operation) is achieved. any additional elements, and its working speed can be reduced for those fabrics that require a reduced working speed, for example in the so-called chiselling, and increased as currently required in modern high-speed conditions. ·,

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be further elucidated by means of a non-limiting example, and technical or structural modifications may be made to the invention in accordance with the accompanying drawing, which schematically illustrates a portion of a state of the art using the control device of the invention.

DETAILED DESCRIPTION OF THE INVENTION

The figure shows the main state induction motor 1, whose shaft 2 is fixedly connected to a flywheel 3, which can be connected via a clutch 5 controlled by the logic unit 5 by means of a cable 6, and a series of connecting gears 7, 8 only two), to the main shaft 9 of the state, which is rotatably mounted in the fixed frame 10. The frame 10 also houses a brake 11, which is controlled by a cable 12 by the logic unit 5 and is intended to stop the connecting gear 2 / ^and therefore to stop the main shaft 9 when it is disconnected from the flywheel 3.

The logic unit 5 also controls the main induction motor 1 via a phase reverser frequency converter 13.

Any other variable frequency feeder may be used in place of the frequency converter 13.

Claims (2)

PATENT CLAIMS A state-of-the-art control device consisting of a main induction motor connected to the flywheel, a clutch for connecting the flywheel to the main shaft, a brake for stopping both the main shaft and the state shaft, and a logic unit for controlling the main 3 of an induction motor, clutch and brake, characterized in that the logic unit controls the main induction motor via. frequency converter type phase reverser.