Patent GB-190414539-A (GB)
Title: Improvements in Reciprocating Bed Motions for Printing and similar Machines.
Inventor: LOCK WILLIAM HENRY
Filed: 1904-06-28
Granted: 1905-06-28
Abstract: 14,539. Lock, W. H., and Isherwood, H. June 28. Cylinder machines with plane printing-surfaces.- Relates to reciprocating-bed mechanism for printing and similar machines, comprising three distinct gears, one for imparting the forward travel, another for the backward travel, and a third for imparting the increasing and diminishing motion at the reversal stages ; also to means for bringing the gears into engagement with the bed or vice versÔ. The bed is driven by a toothed rack engaging with a toothed wheel 1 secured on a shaft 2 upon which ride three toothed wheels 5, 6, 7, each of which is fast upon a sleeve 8, 9, 10, the latter being independent of one another and also of the shaft 2. The two wheels 5, 6 are driven at the same speed, but in opposite directions, from the driving-shaft, the wheel 5 by the wheel 11, and the wheel 6 by the wheels 13, 14. The third wheel 7 gears with a rack 15 reciprocated by means of a crank-pin 16 on the wheel 11. Each of the sleeves 8, 9, 10 has a notch 17, 18, 19 adapted to receive the end of a bolt 20, 21, 22, the latter being mounted in a disc 23 rigidly attached to the shaft 2. These bolts are moved longitudinally by means of three cranks set 120 degrees apart on the crank shaft 24, mounted in the disc 23 and adapted to rotate by means of two starwheels 28, 29 or by one double star-wheel. These star-wheels, during the revolution of the disc 23, are brought into contact with two tappets 30, 31 upon a slide 32, which is made to slide horizontally by means of a pin engaging in a cam-groove on the disc 33, the latter being revolved through the bevel-wheels 36, 37, which are in the ratio two and a half to one. The bolt 20 is shown projecting into the groove 17, this being the position just before the end of the uniform forward travel of the bed, but, at the end of this uniform travel, the bolt 20 is moved out of its groove 17 and the bolt 22 moved into the groove 19 of the sleeve 10, thus connecting the pinion 1 with the reciprocating rack 15. The bed is gradually brought to rest, its direction of motion reversed, and its speed gradually increased to the maximum, when at this point the bolt 22 is withdrawn from its groove 19 and the bolt 21 inserted in the groove 18. The backward travel of the bed is thus maintained through its connection with the wheel 6. At the end of this uniform backward travel, connection with the rack 15 is again brought about, the speed decreased to zero and reversed, and a fresh cycle started. At the beginning and end of the uniform forward and backward travel, the three grooves 17, 18, 19 are in register with their bolts, and during these periods the tappets 30, 31 are in their inoperative positions. The diminution of speed, stoppage, and increase of speed occur during half a revolution of the shaft 2. The ratio of the bevel-wheels 36, 37 may be five to one, but, as the reciprocation of the bed occupies only two and a half revolutions of the shaft 2, the camgroove in the disc 33 must be arranged so that the automatic clutch mechanism gives two complete cycles of operations for each revolution of the disc 33 instead of one as before. Fig. 11 shows another form of mechanism. The two pinions 39, 40 are mounted on a rocker 42 and gear with one another as well as alternately with the rack 41 of the bed. These pinions are driven by a pinion 51 on the driving-shaft 50, gearing with a pinion 52 riding loose on the rocker shaft 43, which also gears with a pinion 53 secured to the pinion 40. The rocker is actuated by a cam-groove 46 in the pinion 47 rotated by a pinion 49 on the driving- shaft 50. A crank 54 secured to the pinion 39 is linked with a slide 57, and upon the latter is mounted a toothed pawl 59 actuated by a vertical slide 61 having a roller engaging in a cam-groove 63. This pawl engages alternately in adjustable notches 64, 65 on the bed. The bed is moved uniformly in one direction by the pinion 40, until the latter is moved out of contact, but at this moment the guide 61 rises in the cam-groove and the bed is actuated by the tooth 59<a> of the pawl 59 engaging in the notch 64. The bed is brought to rest and reversed until its maximum speed is reached, when the tooth 59<a> is withdrawn by the cam arrangement from the notch 64, and the pinion 39 carries on the motion. When the vertical guide 61 next descends, the tooth 59<b> engages with the notch 65 and the reversal is again commenced. In a further modification, shown in Fig. 14, the crank 54 is carried by the driving-shaft, and the rocker 42 is actuated by a stationary pin 71 and a cam-groove 46, through the agency of links 69, 70, the cam-groove being situated in a pinion 47 actuated by the pinion 53 secured to the pinion 39.