The Artizan . elevation and of one of Messrs Colliers double lever punching,shearing, and bar-cutting machines. The massive framing of the machine is planed at each end to receive the punching and shearing slides, whichare actuated by levers resting upon cams on the main driving shaft; ofthese cams there are two so fixed as to be diametrically opposite, andthus the punching and shearing portions of the machine are actuatedalternately. The cams are furnished with circular rollers, which aci upon the leversduring the operations of punching and shearing, the objects of using thesebeing to
The Artizan . elevation and of one of Messrs Colliers double lever punching,shearing, and bar-cutting machines. The massive framing of the machine is planed at each end to receive the punching and shearing slides, whichare actuated by levers resting upon cams on the main driving shaft; ofthese cams there are two so fixed as to be diametrically opposite, andthus the punching and shearing portions of the machine are actuatedalternately. The cams are furnished with circular rollers, which aci upon the leversduring the operations of punching and shearing, the objects of using thesebeing to reduce the friction. The levers are made of wrought iron, and Fio. those portions; of their surfaces upon which the cam rollers act areprotected by being coated with steel, as also are their working surfaces incontact with the shearing and punching slides. The punching slide isprovided with a block placed under the end of the lever by which it isoperated, and by withdrawing this block the punch is thrown out of the shearing end of the machine an adjustable stop is added imme-diately in front of the shearing block, to hold down the metal being sheared,which insures its being cut square on the edge, and at the same timerelieves the workman of the strain of holding the plate upon which he isoperating. This is a great advantage, inasmuch as it is impossible bymanual power to hold a plate perfectly steady. By this arrangement short pieces of metal are also prevented fromgetting down between the cutter, and so breaking the machine. Upon the end of the centre shaft is forged an eccentric which workswithin a block placed upon guides, so as to give it
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
