EP0056954A2
Expired / Lapsed
EP
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Electric control for yarn feeding devices
Assignee: Roj Electrotex SpA
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Filing: 1982-01-14
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Granted: —
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Expires: 2002-01-14
Abstract
Abstract An electric device for the control of yarn feeding devices for weaving machines, of the type providing for the presence of a yarn supply wound onto a drum and comprising an electric three-phase driving motor, wherein, in order to change the speed of said motor, this latter is supplied with AC voltage, phase controlled by triacs. For this purpose, three signals are used representing a selected speed for the motor, the true speed of the motor itself and, respectively, the presence of the yarn supply on the drum, said signals being compared and processed into an electronic circuit, in orderto produce signals forthe control of the said triacs. The said three signals are compared in a circuit generating a signal which must in turn be compared with three periodic ramp signals having the same phase and a period half those of the three supply voltages of the motor, in order to generate square wave signals for energizing the corresponding triacs.
Inventors
- 👤 Fiorenzo Ghiardo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 16:08
CPC Classifications
D; D03; D03D; D03D47/00; D03D47/34; D03D47/36; D03D47/361; H; H02; H02P; H02P27/00; H02P27/02; H02P27/026
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
133 words
1) Electric device for the control of yarn feeding devices for weaving machines, of the type providing for the presence of a yarn supply wound onto a drum and comprising an electric three-phase driving motor, characterized in that, in order to change the speed of said motor (1), this latter is supplied with AC voltage, phase controlled by triacs (T 1 , T 2 , T 3 ), and in that three signals are used representing a selected speed(V I ) for the motor, the true speed (V EFF ) of the motor itself and, respectively, the presence of the yarn supply (f) on the drum, said signals being compared and processed into an electronic circuit, in order to produce signals (a , a 2 , a 3 ) for operating said triacs.
Claim 2
Dependent Claim
133 words
1) Electric device for the control of yarn feeding devices for weaving machines, of the type providing for the presence of a yarn supply wound onto a drum and comprising an electric three-phase driving motor, characterized in that, in order to change the speed of said motor (1), this latter is supplied with AC voltage, phase controlled by triacs (T 1 , T 2 , T 3 ), and in that three signals are used representing a selected speed(V I ) for the motor, the true speed (V EFF ) of the motor itself and, respectively, the presence of the yarn supply (f) on the drum, said signals being compared and processed into an electronic circuit, in order to produce signals (a , a 2 , a 3 ) for operating said triacs.
Claim 3
Dependent Claim
80 words
2) Electric control device as in claim 1, wherein the said three signals (V , V EFF ' f) are compared in a circuit (18) generating a signal (v CONTR ) which must in turn be compared with three periodic ramp signals having the same phase and a period half those of the three supply voltages of the motor, in order to generate the said square wave signals (a , a 2 , a 3 ) energizing the corresponding triacs.
Claim 4
Dependent Claim
47 words
3) Electric control device as in claims 1 and 2, wherein each of the said ramp signals is generated by a ramp generating circuit (16) synchronized by a signal (V ) sent from a circuit (15) detecting the passage through zero of the corresponding motor supply voltage.
Claim 5
Dependent Claim
68 words
4) Electric control device as in claims 1 to 3, wherein the said three signals w I , V EFF , f) are compared also in a further electronic circuit (21) which is apt to generate a signal (f 1 ) for energizing the supply of a winding apt to brake the motor when the signal (f) indicating the presence of yarn supply takes up the zero value.
Claim 6
Dependent Claim
27 words
5) Electric control device as in claim 4, wherein the supply of the braking winding is no longer energized when the motor rotation speed is very low.
Claim 7
Dependent Claim
15 words
6) Electric control device as in claims 1 to 5, 'wherein the motor is delta-supplied.
Claim 8
Dependent Claim
32 words
7 ) Electric control device as in claim 6, wherein the circuit (15) detecting the passage through zero of the voltage of one of the phases, is preceded by a decoupler (19).
Claim 9
Dependent Claim
15 words
8) Electric control device as in claims 1 to 5, wherein the motor is star-supplied.
Claim 10
Dependent Claim
25 words
9) Electric control device as in claims 1 to 8, further comprising a two-phase reversing switch (14) for reversing the rotation sense of the motor.
Claim 11
Dependent Claim
69 words
10) Electric control device as in claims 1 to 9, forming an integrating part of a yarn feeding device, the electric supply of which can be obtained together with the supply of other similar devices from a single separate power supply (11), which comprises an alternating current output for the motor, and a low voltage direct current output for supplying the electronic circuit and the winding braking the motor.
References Cited (Backward Citations)
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