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US 2008/0156206 A1Published application
Press machine
AssigneeYamada Dobby Co., Ltd.
InventorAkihiro Yoshida
Life of this patent
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Abstract
A press machine is configured with an adjustable slide stroke length. The press machine comprises a frame, a crankshaft borne rotatably on the frame, a slide disposed under the crankshaft, a first lever swingably supported on the frame, a second lever swingably connected to the first lever through a first pin, a displacing mechanism for displacing the first pin, and a linear approximation mechanism that exerts a horizontal force to the first pin so as to convert a rotation of each eccentric portion of the crankshaft into an elevating motion of the slide.
Claims7
A press machine comprising:
- a frame;
- a crankshaft having two eccentric portions rotatably borne on said frame;
- an elevatable slide disposed under said crankshaft and characterized by an elevating stroke length;
- two sets of levers provided on both sides of said crankshaft and supporting said slide, each set of the levers including a first lever swingably borne about an axis parallel to the axis of said crankshaft, and a second lever connected to said first lever through a first pin parallel to said crankshaft;
- a displacing mechanism operatively connected to said frame for displacing said first pins and thereby providing an adjustment to the elevating stroke length of the slide;
- a linear approximation mechanism for exerting a horizontal force to each of said first pins so as to convert a rotation of each eccentric portion of said crankshaft into an elevating stroke motion of said slide, wherein
- said linear approximation mechanism includes
- said first lever;
- connections swingably connected to each eccentric portion of said crankshaft;
- third levers connected to said connections through second pins parallel to said crankshaft;
- fourth levers connected to said third levers through third pins parallel to said crankshaft, wherein
- each of said first pins penetrates one of said fourth levers.
9 more elements
Dependencies are inferred from the claim text.