Patent GB-190008522-A (GB)
Title: Improvements in Printing Machinery.
Inventor: NEWTON HENRY EDWARD
Filed: 1900-05-08
Granted: 1900-11-17
Abstract: 8522. Newton, H. E., [Hoe, R.]. May 8. Cylinder machines with plane printing-surfaces.- The first part of the invention relates to means for driving the cylinder at high speed, in which the cylinder is driven by or in synchronism with the bed during the printing movement, and is driven by constant-speed gearing during the completion of the stroke and the return of the bed. The printing movement is preferably that part of the forward stroke of the bed in which it is moving at a high and comparatively constant speed, so that the driving of the cylinder is transferred from the bed to the constant speed mechanism, while the cylinder is still running at a high rate of speed and considerably before the stroke of the bed is completed. Fig. 2 is a diagrammatic view, in which the bed 3 is driven in a usual manner by a rack 4 and railroad gear 5 running on a fixed rack 6 and reciprocated by a rod 7 and crank-pin 8 on a wheel driven at a constant speed. On the bed 3 are racks 15, which gear during the printing movement with wheels 16, which are preferably segmental wheels, on the ends of the cylinder 17. On the shaft 14 of the cylinder is fixed a gear-wheel constantly in mesh with a wheel 22 driven at constant speed by a wheel 26 during such times as the cylinder is not driven by the racks 15 and wheels 16. The teeth of the wheel 26 are cut away at 27. The cylinder 17 is raised and lowered so as to clear the bed and racks when not printing, by a wellknown form of toggle &c. mechanism, and, when this mechanism is operated, an eccentric 24 is also operated to move the wheel 22 and keep it properly in gear with the wheel on the cylinder. The Figure shows the parts in. the position when the bed is about reversing its stroke. As it moves to the left, the wheels 16 will come into gear with the racks 15 at about the time the wheel 26 rums out of gear with the wheel 22, and at the end of the printing movement the racks 15 run out of gear and the wheels 26 and 22 again run into gear. In order to bring the wheels 16 and racks 15 more positively into gear, these wheels and racks are provided with enlarged teeth 20, 19. For a similar purpose the wheels 22 and 26 are provided with short curved racks 28, 29. Specification No. 6321, A.D. 1898, is referred to. The second part of the invention relates to the means for placing the sheets upon impression cylinders or sheet carriers running at a high, and substantially constant, speed. In the arrangement shown in Fig. 7, the grippers are mounted upon arms loose on the cylinder shaft 14 and capable of an angular movement relatively to the cylinder, so that they may be moved away from the impression surface 17 of the cylinder, as the latter rotates, and brought to rest while the grippers take the sheet from the feed-board 45, the impression surface 17 continuing its movement and overtaking the arms and grippers. The arms are connected by a bar 56 on to which the gripper fingers 46 grip the sheet. This bar 56 abuts against the end of the impression surface 17 during the printing and delivery &c. of the sheet, the arms and cylinder moving together during such time. The arms are moved relatively to the cylinder for the feeding of the sheets to the grippers by means of segments 53 on a shaft 54 engaging teeth 51 on the hubs 50 of the arms. The shaft 51 of the segments 53 is operated by a cam-groove 59 in a cam 60. As the cylinder makes two revolutions for each sheet fed to it, the cam 60 is driven at half the speed of the cylinder, so that it only operates the arms once in every two revolutions of the cylinder. The shaft 47 of the gripper fingers 46 is operated to take the sheets from the board 45 and, after the impression, release them for delivery, by a toothed segment 70 journalled at 71 and operated by an arm 73 and cams 74, 75 on the cam 60. While the gripper. carrying arms are at rest by the feed-board they may be locked by hooks 83 engaging pins 82 on the arms. The hooks 83 are on a shaft 84 in brackets 85 of the framing, and are operated by an arm 86, rod 87, and cam. Any suitable form of delivery mechanism may be used, such as the switches 97 and tapes 96 &c. The front stops 91 to which the sheets are fed may be on a shaft 92 operated by a cam & The gripper &c. mechanism may be applied to any form of rotary sheet-carriers in printing machines.