Electronic controlling equipment for driving systems with electr

Details Electronic controlling equipment for driving systems with electr Electronic controlling equipment for driving systems with electr

1984-09-24

1987-04-21

Nerbun, Peter

Sewing

Elements

Starting or stopping

112239, 112300, D05B 6922

Patent

active

046587420

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

As is known, electronic equipment for the control of the driving systems with electromagnetic couplings for industrial sewing and/or overcasting machines, have many advantages including the ability to make speed adjustments, the selection of the stopping points and controls for the additional operations; however they do not allow a continuous speed adjustment. The dynamic parameters do of earlier systems do not allow the intensive use of the machine and the number of components is therefore increased.


OBJECTS OF THE INVENTION

It is, therefore, the principal object of the present invention to provide continuous speed control for industrial sewing with a simple contactless control device.
Another object of this invention is to provide a system for the purposes described with improved dynamic parameters and, therefore, a rapid response to the controls and high efficiency.
Still another object of this invention is simplicity in construction, employing a minimum number of components in an optimized scheme, ensuring high efficiency and safety in operations.
Yet another object is to employ the same scheme for a very wide range of powers and speeds, by adequate adjustment of the terminal amplifiers.


SUMMARY OF THE INVENTION

These objects and others which will become apparent hereinafter are attained, in accordance with the present invention, with an electronic system for the control of the driving system and electromagnetic coupling of industrial sewing and/or overcasting machines.
According to the invention, it is able to perform a continuous speed control with improved dynamic parameters by employing an optimized scheme which ensures high economic efficiency and safety in operation.
The invention is contactless and employs electromagnetic sensors for speed detection and armature position detection. The foot pedal is the machine operator's input device for varying the speed, lifting the presser foot, thread loosening and thread cutting.
The speed control device consists of a speed regulator, with signal inputs from a comparator and a logic circuit, and two power amplifiers, one controlling the brake mechanism and the other controlling the clutching mechanism.
The logic circuit, with input signals from the foot pedal, speed transducer and armature position transducer, control the machine's scheme of interconditioning and interblocking.


BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a block diagram of an electronic equipment for the control of the driving system;
FIG. 2 is a control device of the input commands, without contacts;
FIG. 3 is a speed and position transducer; and
FIG. 4 is an electronic circuit diagram of the control system.


SPECIFIC DESCRIPTION

In accordance with the invention, a machine 1 is connected by a transmission system 2 with a driving system 3. The driving system has an asynchronous motor 4, clutch 7 and a braking mechanism 12. The machine is controlled by the machine operator through input means 5. The operator can control the machine speed and lifting of the presser foot, cutting of the thread with a scissors and thread loosening.
As the operator changes the speed, the actual speed is compared to the desired speed (set point from input means 5) in comparator 8. The speed signal is generated by the speed and position transducer 9. An error signal in proportion to the difference is used by the speed regulator 10 to adjust the speed of the machine. The power amplifiers 11 and 13, which control the clutch 7 and braking mechanism 12 respectively, responds to control signals from the speed regulator 10. A voltage source 6 supplies both the controller 5 and power amplifier 11.
The logic block 14 receives control signals by the operator from control device 5. The logic block also receives speed and position signals from the speed and position transducer 9. The logic block also controls lifting of the presser foot, driving of the scissor and loosening the thread of the machine 1. The stopping at a fixed, preset point is effected by the logic block 14 through the

REFERENCES:
patent: 3761790 (1973-09-01), Daab
patent: 4014277 (1977-03-01), Morinaga et al.
patent: 4080914 (1978-03-01), Ishida et al.
patent: 4228385 (1980-10-01), Angersbach et al.
patent: 4578624 (1986-03-01), Neki et al.

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