Yarn runner-length controller for knitting machines

Details Yarn runner-length controller for knitting machines Yarn runner-length controller for knitting machines

1974-10-15

1976-06-08

Feldbaum, Ronald

Textiles: knitting

United needle machines

Straight

2351501, 235 92DN, D04B 2300, D04B 2700

Patent

active

039615006

ABSTRACT:
A yarn runner-length controller for warp beam knitting machines utilizes information of the yarn unwinding rate from a warp beam section and continuously compares this information to a signal related to the desired runner-length of the yarn. This continuous comparison yields an error signal with a magnitude proportional to the difference between the desired runner-length and the actual runner-length. The error signal is sampled and this sampled error signal activates a control device operating on the angular velocity of the warp beam section so as to adjust this velocity in the direction that reduces the difference between the actual runner-length and the desired runner-length. The magnitude of the sampled error signal is reduced to zero before the next sampled error signal is received by means of a signal from the control device related to the amount of adjustment made to the beam section's angular velocity. When the sampled error signal is reduced to zero, the control device maintains the beam section's angular velocity to the last adjusted value. The continued sampling of the error signal thus maintains the actual runner-length to within close tolerances of the desired runner-length throughout the duration of the knitting process.
An error display panel indicates any deviation between the actual and desired runner-lengths. A fail-safe module shuts down the knitting machine if the deviation between the actual and desired runner-lengths is greater than a predetermined amount.
In addition, data acquisition means are included which can monitor such conditions as actual and desired runner-lengths, error between actual and desired runner-lengths, number of knitting interruptions, and duration of knitting interruptions.

REFERENCES:
patent: 2674109 (1954-04-01), Bassist
patent: 3223906 (1965-12-01), Dinger
patent: 3626725 (1971-12-01), Fertig et al.
patent: 3630052 (1971-12-01), Fertig et al.
patent: 3668904 (1972-06-01), Murenbeeld
patent: 3673473 (1972-06-01), Werner
patent: 3727033 (1973-04-01), Bassist
patent: 3749329 (1973-07-01), Nedreski
patent: 3764876 (1973-10-01), Arthur
patent: 3858415 (1975-01-01), Wilson et al.

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