| 摘要 |
Apparatus for use in a bag forming/filling/sealing machine controls a film transportation motor (10) and an article transportation motor (18) based on the operation of a sealer driving motor (25) which is driven at a cyclic variable speed. The rotation cycles of the respective motors (10, 18, 25) are determined, based on a reference pulse which is generated by a crystal oscillator (28) and input to a central processing unit (27). When a value of the length of articles (19) to be packaged is input to the central processing unit (27), the central processing unit (27) specifies constant speeds of the film transportation motor (10) and the article transportation motor (18) and a cyclic variable speed of the sealer driving motor (25). The cyclic variable speed of the sealer driving motor is properly controlled by comparing a feedback pulse generated by an encoder (33) with a reference pulse generated by the crystal oscillator (28), while the cycle offsets of the film transportation motor (10) and the article transportation motor (18) are corrected, based on the timing signal output from an electronic cam (32).
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