EP0249290A1
Expired / Lapsed
EP
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Sewing machine with electronic control device for the needle driving motor
Assignee: Necchi SpA
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Filing: 1987-06-09
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Granted: —
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Expires: 2007-06-09
Abstract
Abstract In a sewing machine a electronic control device for the needle driving motor is provided, comprising an electronic circuit which employs logic gates for its working in such a way as to obtain a simple, reliable and cheap control device.
Inventors
- 👤 Flavio Bisson
- 👤 Giacomo Cattaneo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 18:24
CPC Classifications
B; B23; B23Q; B23Q15/00; B23Q15/20; B23Q15/22; B23Q15/26; D; D05; D05B; D05B69/00; D05B69/22; D05B69/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
458 words
Sewing machine comprising a motor for reciprocating a sewing needle between a first and a second extreme position, a motor speed regulator for obtaining a zero speed and a maximum speed, first sensor means sending a control electric signal respectively when the needle is in one of said first and second extreme positions, first means being provided of the logic gate type with a first and second input and an output; which commute from a first and second logic condition and vice versa, i.e. a first logic condition in which at their output an electric signal is present which controls the starting of the motor and a second logic condition in which at their output an electric signal is present which controls the stopping of the motor, the first input of said first logic gate means being operatively connected to said regulator in such a way that when the regulator is in its motor starting position, said first logic gate means are in their first logic condition and when said regulator is in its motor stopping position, said first logic gate means commutate from one to the other of their two logic conditions according to the logic level present at their second input, second means being moreover provided of the logic gate type having a first and a second input and an output, the output of said second means being connected to the second input of said first logic gate means, said second logic gate means commutating from a first to a second logic condition and vice versa, the commutation of said second logic gate means from one to the other of their two logic conditions causing the commutation of said first logic gate means from one to the other of their two logic conditions when said regulator is in the motor stopping position, said first sensor means being operatively connected to the first input of said second logic gate means, control means being connected to the second input of said second logic gate means in order to carry said second logic gate means in the commutation condition when said regulator is in the motor starting position, and when said regulator is in the motor stopping position and till the sending of said control signal, and for carrying said second logic gate means to the non-commutation condition when said regulator is in the motor stopping condition, and once this control signal has been sent, said control signal, when the regulator is in the motor stopping position, causing the commutation of said second logic gate means from one logic condition to the other in such a way as to cause the commutation of said first logic gate means to the logic condition, corresponding to the stopping of the motor.
Claim 2
Dependent Claim
458 words
Sewing machine comprising a motor for reciprocating a sewing needle between a first and a second extreme position, a motor speed regulator for obtaining a zero speed and a maximum speed, first sensor means sending a control electric signal respectively when the needle is in one of said first and second extreme positions, first means being provided of the logic gate type with a first and second input and an output; which commute from a first and second logic condition and vice versa, i.e. a first logic condition in which at their output an electric signal is present which controls the starting of the motor and a second logic condition in which at their output an electric signal is present which controls the stopping of the motor, the first input of said first logic gate means being operatively connected to said regulator in such a way that when the regulator is in its motor starting position, said first logic gate means are in their first logic condition and when said regulator is in its motor stopping position, said first logic gate means commutate from one to the other of their two logic conditions according to the logic level present at their second input, second means being moreover provided of the logic gate type having a first and a second input and an output, the output of said second means being connected to the second input of said first logic gate means, said second logic gate means commutating from a first to a second logic condition and vice versa, the commutation of said second logic gate means from one to the other of their two logic conditions causing the commutation of said first logic gate means from one to the other of their two logic conditions when said regulator is in the motor stopping position, said first sensor means being operatively connected to the first input of said second logic gate means, control means being connected to the second input of said second logic gate means in order to carry said second logic gate means in the commutation condition when said regulator is in the motor starting position, and when said regulator is in the motor stopping position and till the sending of said control signal, and for carrying said second logic gate means to the non-commutation condition when said regulator is in the motor stopping condition, and once this control signal has been sent, said control signal, when the regulator is in the motor stopping position, causing the commutation of said second logic gate means from one logic condition to the other in such a way as to cause the commutation of said first logic gate means to the logic condition, corresponding to the stopping of the motor.
Claim 3
Dependent Claim
160 words
Sewing machine according to the claim 1, comprising a position selector with at least two positions for causing the motor to stop the needle at least either in the first or in the second extreme position, and comprising in addition to said first sensor means, at least second sensor means supplying a control electric signal when the needle is in the other of said first and second extreme position, said first and second sensor means being operatively connected to the first input of said second logic gate means through the selector, said selector directly operating the connection between either the one or the other of said first and second means, depending from its position, and said first input of said second logic gate means, control means being moreover provided for carrying said first logic gate means in the first logic condition when said selector is in an intermediate position between its two positions corresponding to the needle stopping extreme positions.
Claim 4
Dependent Claim
92 words
Sewing machine according to the claim 1 or 2, comprising transistor means which connect said regulator to said first logic gate means, said regulator for starting or stopping the motor, according to its position, piloting the transistor means either in conducting condition or in the non conducting condition, said transistor means controlling, by means of their above said conditions, the feeding of a tension source to said first logic gate means for carrying them either in their first logic condition or in the commutation condition from one logic condition to the other.
Claim 5
Dependent Claim
146 words
Sewing machine according to the claim 2, comprising transistor means which connect said regulator to said first logic gate means, said regulator for starting or stopping the motor, according to its position, piloting the transistor means either in conducting condition or in non conducting condition, said transistor means controlling, by means of their above said conditions, the feeding of a tension source to said first logic gate means for carrying them either in their first logic condition or in the commutation condition from one logic condition to the other, said control means comprising a mobile contact of the selector, said mobile contact, in said intermediate position of the selector, causing the supply of a signal to said transistor means for carrying them in one of the two conducting or non conducting positions corresponding to the condition of first logic state of said first logic gate means.
Claim 6
Dependent Claim
132 words
Sewing machine according to one of the foregoing claims, in which said control means comprise a bistable multivibrator connected to the second input of said second logic gate means and piloted by said regulator and by capacitor means whose connection on a tension source is controlled by a monostable multivibrator piloted by the control signal of said sensor means, said regulator piloting said bistable multivibrator causing it to assume a first state in which the bistable multivibrator supplies a logic signal to said second logic gate means for keeping them in said condition of non commutation, said capacitor means piloting said bistable multivibrator for causing it to assume a second state in which the bistable multivibrator supplies a logic signal to said second logic gate means for keeping them in commutation condition.
Claim 7
Dependent Claim
302 words
Sewing machine according to claim 2 comprising transistor means which connect said regulator to said first logic gate means, said regulator for starting or stopping the motor, according to its position, piloting the transistor means either in conducting condition or in non conducting condition, said transistor means controlling, by means of their two above said conditions, the feeding of a tension source to said first logic gate means for carrying them either in their first logic condition or in the commutation condition from one logic condition to the other, said control means comprising a bistable multivibrator connected to the second input of said second logic gate means and piloted by said regulator and by capacitor means whose connection to a tension source is controlled by a monostable multivibrator piloted by the control signal of said sensor means, said regulator piloting said bistable multivibrator causing it to assume a first state in which the bistable multivibrator supplies a logic signal to said second logic gate means for keeping them in said condition of non commutation, said capacitor means piloting said bistable multivibrator for causing it to assume a second state in which the bistable multivibrator supplies a logic signal to said second logic gate means for keeping them in said commutation condition, said control means comprising a mobile contact of the selector, said mobile contact, in said intermediate position of the selector, causing the supply of a signal to said transistor means for carrying them in one of the two conducting or non conducting positions corresponding to the condition of first logic state of said first logic gate means and causing the supply of a signal to said monostable multivibrator for carrying this last in a state in which said capacitor means pilot said bistable multivibrator causing it to assume said second state.
References Cited (Backward Citations)
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