. Appleton's dictionary of machines, mechanics, engine-work, and engineering. ting the tool-holder in theusual manner. The feed-motion of the cross-slide is ingeniously effected by two ratchet-catches attachedto the spur-geering on the end of the horizontal screw. The lower extremities of these catches are setto come in contact with movable tappets attached to the fixed frame of the machine, so as to give theproper amount of motion to the screw of the cross-slide. The method of attachment of the driving-chains adopted by M. Decoster has the advantage of giving a steadier pull to the tool-slide
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. ting the tool-holder in theusual manner. The feed-motion of the cross-slide is ingeniously effected by two ratchet-catches attachedto the spur-geering on the end of the horizontal screw. The lower extremities of these catches are setto come in contact with movable tappets attached to the fixed frame of the machine, so as to give theproper amount of motion to the screw of the cross-slide. The method of attachment of the driving-chains adopted by M. Decoster has the advantage of giving a steadier pull to the tool-slide than can beobtained by the central mode of fastening, with a single chain. The principle of the movable tool and fixed table has also been adopted by M. Cave and Mr. Hick, ofBolton. In M. Caves machine, the driving motion is given to the tool-slide by an endless strap. Thedriving-pulley is placed immediately over the centre of the bed of the machine, the strap from whichpasses below two fixed tension-pulleys, placed just beneath the driver, and thence round two fixed pul-. TCuLS. 753 leys attached to the opposite ends of the bed. Tha attachment of this strap to the sliding-frame of th6tool is effected by passing the strap in contrary directions round two separate pulleys, each carrying apinion geering with a central driving-wheel. The shaft of the latter passes across the bed of the ma-chine, and carries two pinions, geering with two racks, placed within the framing, and running along thewhole length of the bed. The arrangement of the spur reversing-geer will be understood by referring to Fig. 34*73, which is aside view of the tool-slide, frame, and geering, with the driving-pulleys removed. A is the travellingtool-slide, carrying the central driving-wheel B, keyed on the pinion-shaft—the shafts C C each carry aloose driving-pulley, capable of connection by means of sliding clutch-boxes with the two pinions D latter work loose on the pulley-shafts, and geer with the
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
