Howa Machinery, Ltd.

Sadao Ukai

Hirotaka Nishikawa

Kanehiro Ito

An apparatus for controlling a drive of each one of spinning frames forming a group, to which a conventional roving bobbin exchange operation for exchanging almost exhausted roving bobbins of the spinning frame with full packaged roving bobbins of a bobbin carrier on a supply rail arranged at a position close to and above the corresponding spinning frame by a known automatic apparatus mounted on a carrier which is capable of displacing along a track arranged on a floor of a spinning factory along an alignment of out-end frames of said spinning frames, is applied, wherein during the spinning operation, a residual roving quantity of the roving bobbins of each spinning frame is measured, while detecting a quantity of yarn wound on cops in each spinning frame, and when the above-mentioned measurement of a residual quantity of roving bobbins reaches a predetermined value, a first signal indicating this condition is issued, while the quantity of yarn wound on the cops is measured to detect a suitable condition to start the above-mentioned roving bobbin exchange operation, and when this suitable condition is detected, a second signal indicating this condition is outputted, then a signal calling the automatic apparatus is outputted based upon the logical product of these two signals, and an allowable time for the arrival of the automatic apparatus at a working position close to a particular position and close to the out-end frame of a spinning frame is set, and if the automatic apparatus for exchanging roving bobbins does not arrive at the above-mentioned working position within the allowable time, the drive of the spinning frame concerned is stopped by a means for controlling the drive of the spinning frames which cooperates with the measurement of a residual quantity of a roving bobbin and measurement of a quantity of yarn wound on the cops.

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Nagoya, Japan

Sadao Ukai