| 摘要 |
A pressing apparatus provides an urging force for the slide cam to press only when necessary, and elsewhere this pressing-urge is held as small as possible, whereby abnormal wear and seizure of the slide cam, slide cam base and the sliding portion of the driven cam are prevented. The pressing apparatus can also provides a large retracting force for the slide cam near a lower dead center of a pressing stroke. The present invention provides a pressing apparatus comprising: a slide cam base; a slide cam slidably provided in a guidepost attached to the slide cam base, the slide cam holding a pressing member such as a bending member and being guided by the slide cam base; a retracting-urge provider provided between the slide bas base and the slide cam for urging the slide cam; and a driven cam for contacting and driving the slide cam; wherein a pressing-urge provider for urging the slide cam only near a lower dead center of a pressing stroke is provided between the slide cam base and the slide cam and/or between the slide cam and the driven cam.
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