Tokai Kogyo Kabushiki Kaisha

Tohru Hamamoto

Sadao Unuma

A second frame 12 is arranged at a predetermined position with respect to a drive sprocket 15 engaged with a drive shaft DS through a substantially true-circular hole shape drive bearing bore 14, and a transferring belt 25 is supported by a belt guide 18 integrally incorporated with the second frame 12 under a suitable tension while a predetermined positional relationship is maintained between the transferring belt 25 and the drive sprocket 15. If the inter shaft distance T between the drive shaft DS and a positioning shaft SS varies due to any reason, the variation in the inter shaft distance T between both shafts DS, SS is allowed by clearances of an elongated hole shape positioning bearing bore 20 formed in the second frame 12 and an elongated hole shape drive bearing bore 13 formed in a first frame 11, and accordingly, the transferring belt 25 is maintained always under a satisfactory predetermined tension with no variation in the tension of the transferring belt 25, thereby it is possible to enhance the accuracy of paper feed operation and printing operation and to enhance the reliability of the sheet feed tractor with a convenient structure.

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Ohbu, Japan

Tohru Hamamoto