| 摘要 |
This invention relates to machine tools of the kind having a bed with slideways thereon and a slide arranged to move on the slideways. In order to enable the slide to be returned to the starting point of the pass, the invention provides a housing secured to the slideways and a rod mounted to move with the slide: the rod carries a spindle on which is mounted a control wheel which rotates against the periphery of a cam pivoted on a pivot pin in the housing perpendicularly to the sliding rod and an operating lever is secured to the pivot pin.
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