| 摘要 |
There are provided a pair of rollers (W, W 1; W, W 2; W 2, W 3; W 3, W 4 ) for taking a sheet in a buckle zones (b 1 -b 4 ), and a pair of rollers (W, W 2; W 2, W 3; W 3, W 4; W 4, W 5 ) for folding a portion of the sheet deflecting from the buckle zones (b 1 -b 4 ). A rotating shaft of at least one of the rollers of each of the roller pairs is carried by one end of a lever ( 6 ). The lever ( 6 ) is arranged for swing around a supporting point ( 8 ), and the other end of the lever ( 6 ) is provided with a spring resiliently biasing the roller carried by the lever ( 6 ) in a direction in which the roller is pressed against the counter roller. One end of an adjustment rod ( 15 a- 15 e) is brought into contact with the other end of the lever ( 6 ). The adjustment rod ( 15 a- 15 e) is guided by a guide ( 14 ) in a direction of its axis. The other end of the adjustment rod ( 15 a- 15 e) is provided with a pulse motor (M 1 -M 5 ) moving the adjustment rod ( 15 a- 15 e) through the guide ( 14 ). The pulse motor (M 1 -M 5 )is driven, whereby the adjustment rod ( 15 a- 15 e) is moved so as to swing the lever ( 6 ), and the gap length between the opposed rollers is adjusted.
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