Patterning control arrangements for knitting machines
First Claim
1. In a patterning control arrangement for multi-feed knitting machines of the type comprising a needle cylinder having needles accommodated in tricks therein, individually selectable patterning butts on or associated with each needle, the said patterning butts being divided into groups at spaced heightwise locations in relation to the needle tricks, and a number, equal to the number of groups, of pattern control means at each feed station with each pattern control means at a station being cooperable with the patterning butts of one group to engage or miss those butts whereby to control the operation of the associated needle wherein the pattern control means each includes an electromagnetically-operated actuator controlled by circuitry arranged to provide operating pulses for the actuator in response to triggering pulses, wherein the improvement comprises that the circuitry is responsive to a specified one of the positive-going or negative-going edges of the triggering pulses to initiate the operating pulses, and inverter means for effectively inverting the triggering pulses at a predetermined speed of operation of the machine whereby the operating pulses are produced in response to the completion of the triggering pulses at operating speeds below the predetermined speed, and in response to the initiation of the triggering pulses at higher operating speeds.
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Abstract
One limiting factor on the speed of a circular knitting machine with individual pattern control of each needle is the time taken by the patterning devices to effect the change between knit and non-knit positions. The initiation of the change cannot take place, at low speeds, before a patterning actuator has cleared from a patterning butt. According to the invention, there is provided an arrangement whereby the actuation takes place from a trailing edge of a triggering pulse at low speeds and from a leading edge at higher speeds.
10 Citations
9 Claims
- 1. In a patterning control arrangement for multi-feed knitting machines of the type comprising a needle cylinder having needles accommodated in tricks therein, individually selectable patterning butts on or associated with each needle, the said patterning butts being divided into groups at spaced heightwise locations in relation to the needle tricks, and a number, equal to the number of groups, of pattern control means at each feed station with each pattern control means at a station being cooperable with the patterning butts of one group to engage or miss those butts whereby to control the operation of the associated needle wherein the pattern control means each includes an electromagnetically-operated actuator controlled by circuitry arranged to provide operating pulses for the actuator in response to triggering pulses, wherein the improvement comprises that the circuitry is responsive to a specified one of the positive-going or negative-going edges of the triggering pulses to initiate the operating pulses, and inverter means for effectively inverting the triggering pulses at a predetermined speed of operation of the machine whereby the operating pulses are produced in response to the completion of the triggering pulses at operating speeds below the predetermined speed, and in response to the initiation of the triggering pulses at higher operating speeds.
Specification