Tsudakoma Corp.

Yoshitsugu Tamura

Yoshitaka Fujita

Kensuke Wakamatsu

Kosuke Maenaka

A weft yarn feed device (1) comprises a measuring and storing drum (7) for storing a predetermined length of a weft yarn (4) thereon for picking operation, a rotary yarn guide (6) for winding the weft yarn (4) on the measuring and storing drum (7), a feed motor (8) for rotating the rotary yarn guide (6), a drive control unit (3) for controlling the operation of the feed motor (8), and a command control unit (2) which gives commands to the drive control unit (3). The length of the weft yarn (4) wound on the measuring and storing drum (7) is detected accurately on the basis of the relation between the number of rotation of the rotary yarn guide (6) and that of the crankshaft of the loom, and a detection signal indicating the length of the weft yarn (4) wound on the measuring and storing drum (7) is fed back to the command control unit (2) to control the feed motor ( 8) properly for winding a predetermined length of the weft yarn (4) on the measuring and storing drum. The drive control unit (3) comprises a reference setting device (23) which provides a voltage corresponding to a reference rotating speed of the feed motor (8) so that the feed motor (8) is driven continuously for rotation at a slightly varying rotating speed about the reference rotating speed, and preparatory winding controller (26) for controlling the feed motor (8) for winding the predetermined length of the weft yarn (4) on the measuring and storing drum (7) while the loom is stopped.

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Kanazawa, Japan

Yoshitsugu Tamura