EP0141505A1 — Device for automatically controlling the draft in…

Claim 1

Independent Claim 126 words

A spinning machine which comprises: at least a pair of feed rollers (20) for feeding at least a sliver (4) to a fibre working portion (21) for carding; at least one first rotational driving source (22) for driving said feed rollers (20); at least a pair of front rollers (23) for drawing out and for feeding said sliver carded at said fibre working portion (21); at least one second rotational driving source (24) for driving said front rollers (23); and an electronic rotation control unit (29) for controlling the rotation of said two different rotational driving sources (22, 24), synchronizing the rotation of said one rotational driving source (22) with the rotation of the other said rotational driving source (24) at a predetermined rotational speed ratio.

Claim 2

Dependent Claim 126 words

A spinning machine which comprises: at least a pair of feed rollers (20) for feeding at least a sliver (4) to a fibre working portion (21) for carding; at least one first rotational driving source (22) for driving said feed rollers (20); at least a pair of front rollers (23) for drawing out and for feeding said sliver carded at said fibre working portion (21); at least one second rotational driving source (24) for driving said front rollers (23); and an electronic rotation control unit (29) for controlling the rotation of said two different rotational driving sources (22, 24), synchronizing the rotation of said one rotational driving source (22) with the rotation of the other said rotational driving source (24) at a predetermined rotational speed ratio.

Claim 3

Dependent Claim 205 words

A spinning machine which comprises: at least a pair of feed rollers (20) for feeding at least a sliver (4) to a fibre working portion (21) for carding; at least one detector (25) of uneven parts disposed upstream in the feeding direction of the sliver at a fibre working portion and for detecting unevenness of said sliver or slivers; a memory means for successively storing information about unevenness of the sliver or slivers, detected by said detector of uneven parts (25); at least one first rotational driving source (22) for driving said feed rollers (20); at least a pair of front rollers (23) for drawing out and feeding said sliver (4) carded at said fibre working porton (21); at least one second rotational driving source (24) for driving said front rollers (23); and an electronic rotation control unit (29) for controlling the rotations of said two rotational driving sources (22, 24) to synchronize the rotation of one driving source with the rotation of the other driving source at a predetermined rotational speed ratio, and uniform the thickness of each part of the sliver drawn out from said front rollers, while feed-forward controlling said information about said sliver which have been stored in said memory means.

Claim 4

Dependent Claim 205 words

A spinning machine which comprises: at least a pair of feed rollers (20) for feeding at least a sliver (4) to a fibre working portion (21) for carding; at least one detector (25) of uneven parts disposed upstream in the feeding direction of the sliver at a fibre working portion and for detecting unevenness of said sliver or slivers; a memory means for successively storing information about unevenness of the sliver or slivers, detected by said detector of uneven parts (25); at least one first rotational driving source (22) for driving said feed rollers (20); at least a pair of front rollers (23) for drawing out and feeding said sliver (4) carded at said fibre working porton (21); at least one second rotational driving source (24) for driving said front rollers (23); and an electronic rotation control unit (29) for controlling the rotations of said two rotational driving sources (22, 24) to synchronize the rotation of one driving source with the rotation of the other driving source at a predetermined rotational speed ratio, and uniform the thickness of each part of the sliver drawn out from said front rollers, while feed-forward controlling said information about said sliver which have been stored in said memory means.

Claim 5

Dependent Claim 60 words

A spinning machine as claimed in claim 1 or claim 2, in which said first rotational driving source (22) is a first electric motor and said second rotational driving source (24) is a second electric motor, and each said motor is of the type which changes the rotational speed in accordance with the change in frequency of its power supply.

Claim 6

Dependent Claim 38 words

A spinning machine as claimed in claim 2, in which said detector of uneven parts for detecting unevenness of said sliver (4) comprises at least a pair of measuring rollers (25) and at least a position sensor (26).

Claim 7

Dependent Claim 28 words

A spinning machine as claimed in claim 2, in which said memory means for successively storing the information about unevenness of the sliver (4) is an analog memory.

Claim 8

Dependent Claim 60 words

A spinning machine as claimed in any one of claims 2 to 5, in which the spinning machine further comprises a first electromagnetic brake means and a second electromagnetic brake means for starting and stopping said first motor and said second motor, respectively, in accordance with brake control signals from a central control portion provided in a operation control unit.

Claim 9

Dependent Claim 64 words

A spinning machine as claimed in any one of claims 2 to 6, further comprising a first pulse generator (27) and a second pulse generator (28) for detecting the rotational speed of said first motor (22) and said second motor (24) respectively, for generating pulse signals so as to control the input operation of the information about unevenness of the sliver into memory means.

Claim 10

Dependent Claim 84 words

A spinning machine as claimed in any one of claims 2 to 7, in which said electronic rotation control unit (29) comprises a first inverter (34) and a second inverter (35) for changing the frequency of the output to be applied to said first and said second motor (22, 24) in accordance with a first control signal and a second control signal from said central portion through variable resistor means for adjusting the carding speed and the feeding speed of the front rollers, respectively.

Claim 11

Dependent Claim 51 words

A spinning machine as claimed in any one of claims 2 to 8, in which said electronic rotation control unit (29) further comprises means for correcting delay which is brought about by a factor particular to a control system so as to compensate for the rotational speed of said first motor.

Claim 12

Dependent Claim 72 words

A spinning machine as claimed in any one of claims 2 to 9, in which said electronic rotation control unit (29) further comprises a feed-forward control signal generating means having a draft rate setting means, and generating said feed-forward control signal to be applied to said second inverter through an operational circuit for levelling off the sliver in accordance with the output from said first pulse generator and said second pulse generators.

Claim 13

Dependent Claim 73 words

A spinning machine as claimed in claim 2, in which said electronic rotation control unit is a microprocessor comprising a central processing unit (CPU), a read only memory (ROM) for storing control programs and various control data, a random access memory (RAM) for storing various data including data corresponding to the output from external elements and units, an input portion, and an input/output portion, both of which interface between input and output thereof.

Claim 14

Dependent Claim 168 words

A spinning machine which comprises: at least a pair of feed rollers provided at a fibre working portion for carding a plurality of slivers and for feeding said slivers to be carded and drafted; a plurality of detectors of uneven parts arranged at the upper stream of the feeding direction of slivers at said fibre working portion and for detecting uneven parts of said slivers, each detector of uneven parts having at least a pair of measuring rollers and at least a position sensor; at least one first rotational driving source for driving said feed rollers; a plurality of pairs of front rollers for drawing out and for feeding said slivers carded at said fibre working portion; a plurality of second rotational driving sources for driving said plurality of pairs of front rollers; and an electronic rotation control unit for controlling the rotations of said two different driving sources so as to card and draft said plurality of said slivers by one spinning machine with different draft rates.

Claim 15

Dependent Claim 168 words

A spinning machine which comprises: at least a pair of feed rollers provided at a fibre working portion for carding a plurality of slivers and for feeding said slivers to be carded and drafted; a plurality of detectors of uneven parts arranged at the upper stream of the feeding direction of slivers at said fibre working portion and for detecting uneven parts of said slivers, each detector of uneven parts having at least a pair of measuring rollers and at least a position sensor; at least one first rotational driving source for driving said feed rollers; a plurality of pairs of front rollers for drawing out and for feeding said slivers carded at said fibre working portion; a plurality of second rotational driving sources for driving said plurality of pairs of front rollers; and an electronic rotation control unit for controlling the rotations of said two different driving sources so as to card and draft said plurality of said slivers by one spinning machine with different draft rates.

Claim 16

Dependent Claim 118 words

A spinning machine as set forth in claim 12 wherein said plurality of detectors of uneven parts consist of the first detector of uneven parts and a second detector of uneven parts having two different pairs of measuring rollers and two different position sensors for detecting different uneven parts of different slivers, said plurality of a pair of front rollers are first front rollers and second front rollers for drawing out and feeding different slivers, and a plurality of second rotational driving sources for driving said plurality of pairs of front rollers consisting of a first rotational driving source and a second rotational driving source, each said rotational driving source being coupled to each pair of front rollers.

Claim 17

Dependent Claim 182 words

A spinning machine which comprises: said feed rollers provided at a fibre working portion for carding a plurality of slivers and for feeding said slivers and for feding said slivers to be carded and drafted, consisting of a first pair of feed rollers and a second pair of feed rollers; a plurality of uneven parts consisting of a first pair of measuring rollers, a second pair of measuring rollers, a first position sensor, and a second position sensor for detecting different uneven parts of different slivers; a first rotational driving source consisting of a first motor for driving said first pair of feed rollers, and a second rotational driving source for driving said second pair of feed rollers; a pair of front rollers for drawing out and for feeding said slivers at said fibre working portion; at least one second rotational driving source for driving said front rollers; and an electronic rotation control unit for controlling the rotation of said two different driving sources so as to card and draft said plurality of slivers by one spinning machine with different draft rates.

Claim 18

Dependent Claim 182 words

A spinning machine which comprises: said feed rollers provided at a fibre working portion for carding a plurality of slivers and for feeding said slivers and for feding said slivers to be carded and drafted, consisting of a first pair of feed rollers and a second pair of feed rollers; a plurality of uneven parts consisting of a first pair of measuring rollers, a second pair of measuring rollers, a first position sensor, and a second position sensor for detecting different uneven parts of different slivers; a first rotational driving source consisting of a first motor for driving said first pair of feed rollers, and a second rotational driving source for driving said second pair of feed rollers; a pair of front rollers for drawing out and for feeding said slivers at said fibre working portion; at least one second rotational driving source for driving said front rollers; and an electronic rotation control unit for controlling the rotation of said two different driving sources so as to card and draft said plurality of slivers by one spinning machine with different draft rates.

Device for automatically controlling the draft in a spinning machine

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