Patent GB-190125097-A (GB)
Title: Improvements in Reciprocating Movements for Printing and other Machines.
Inventor: NEWTON HENRY EDWARD
Filed: 1901-12-09
Granted: 1902-01-30
Abstract: 25,097. Newton, H. E., [Hoe, R.]. Dec. 9. Cylinder m a chines with plane printing- surfaces. - Relates to means for reciprocating the beds of printing and other machines. Fig. 2 shows a plan, and Fig. 3 a transverse section, of one e arrangement. The bed B is driven through the greater part of its movement in either direction by racks 23, 24 on the bed gearing alternately with a wheel 25 on a shaft 26. The shaft 26 is geared by bevel-wheels 28, 29 to the shaft 20, geared to the shaft of the impression cylinder C by gearing 17, 18, 19. The racks 23, 24 are mounted to slide laterally in guides 30 on the hangers 22 of the bed B, so that they may be moved into and out of position for gearing with the wheel 25. Each rack is connected by links 31 with a longitudinally-sliding bar 32, and, as the bed reaches the ends of its movement in either direction, the bars 32 engage the fixed framing of the machine, and are moved by it so as to move one rack into gearing position and the other out. On the wheel 25 is journalled a pinion 40 of half its diameter, the bearing centre being midway between the axis and the pitch circle of the wheel 25. The pinion 40 gears with a fixed internal gear 41 on the frame piece 27, so that a point on the pitch circle of the pinion will move in a straight line parallel with the racks 23, 24 and movement of the bed. From this point as centre is formed a curved groove 43 in a plate 42 fixed to the pinion. On each end of the bed is fixed a curved piece 45, having the same radius as the groove 43. As the bed nears the end of its movement and the rack 23 or 24 is about to run out of gear with the wheel 25, one of the pieces 45 engages in the groove 43, the latter then controlling and reversing the movement of the bed, gradually slowing it down and then starting it in the opposite direction with accelerating speed until it is moving at normal speed and the other rack 23 or 24 comes into gear with the wheel 25. The shaft 26 and wheel 25 make three revolutions for each complete to-and-fro movement of the bed, one revolution being taken up by the wheel 25 in driving each rack 23, 24, and a half revolution serving for each reversing-movement of the bed. The curved grooves 43 may be on the bed, and a projection such as 45 be fixed on the pinion 40. The outer hearing-face of the groove 43 may be omitted, its innur face operating as an abutment to engage the pieces 45 to reverse the bed, but the groove is preferred. A modification of this arrangement is described, in which the wheel 25 is in vertical position and its shaft 26 is horizontal. In this arrangement, the racks are fixed on the bed, but are not in the same vertical plane, and the rim of the wheel 25 is movable on, but rotates with, its central part. The rim is moved by a cam &c. into positions for gearing with the racks alternately. Fig. 21 shows diagrammatically another arrangement. The bed B is driven throughout the greiter part of its movement by racks 111, 112, and a gearwheel 25 carried by an arm pivoted on the shaft of a wheel 104 which gears with and drives the wheel 25. The arm 25 is rocked, to bring the wheel 25 into gear with the racks 111, 112 alternately. by a cam 120 &c. On the wheel 104 is journalled a pinion 102 of half its diameter, which gears with a fixed internal gear. On the pitch line of the pinion 102 is a crank 109, fixed to the pinion, which crank moves in a straight line parallel to the racks 111, 112. In the hanger H of the bed is formed a slot S, which reciprocates over a bearing 101 on the crank 109. When either of the racks runs out of gear with the wheel 25, the bed is gradually stopped and re-started by the crank 109, the bearing of which engages the end of the slot S, and is locked therein by a pivoted catch L. The catches L are operated by inclines on the framing. A modification of the last arrangement is described, in which the wheel 25 is horizontal and is journalled on a stud on a sliding frame moved by a cam to bring the wheel into gear with the racks alternately.