Patent GB-966210-A (GB)
Title: Improvements in underside tension ockup apparatus for printing apparatus
IPC: B41F27/10
Filed: 1962-12-14
Abstract: 966,210. Printing surfaces. WOOD NEWSPAPER MACHINERY CORPORATION. Dec. 14, 1962 [Jan. 15, 1962], No. 47314/62. Heading B6C. Four pairs of diametricallyopposed stereotype plates 3, Fig. 1, are secured to a printing cylinder 1 by four sets of tension lock-up apparatus each of which is located in a L-shaped groove 20, Fig. 15, which extends longitudinally from an end of the cylinder to near the centre thereof. Each groove is displaced by 90 degrees relative to another. Each set of lock-up apparatus comprises a series of fingers 51, Fig. 3, for engaging recesses 5 in the underside of a plate 3 near one end thereof and a series of fingers 12 for engaging similar recesses 4 at an end of a plate 3, which, together with the previously referred to plate, forms one of the diametricallyopposed pairs. The fingers 12, together with plate-lifting fingers 14, are mounted on four hook members 7, Figs. 2, 3 and 5, each of which forms, with an actuator arm 8 and a prestressed Belleville spring assembly 9, 10, 11, Fig. 3, a self-contained clamping unit. Each of these units is pivotally mounted, through lugs 25, between clamp supports 31, 26 or 30, as shown in Fig. 2. Each support is bolted to the floor of the associated groove, part 21, the supports 26, Fig. 8 differing from those designated 31 and 30 in that 30 has straight ends whilst each of the supports 31 differs from 30 only in width and in the fact that it has only one socket to receive a lug 25. The clamping supports are bored to receive a shaft 40 which has a cam surface 41 and is rotatable to move the fingers 12 towards and away from the plate recesses 5 through a handoperated lever and toothed wheel operating mechanism 110 . . . 114 as shown in Fig. 16. As the fingers 12 are rocked into the plate unlocking position the fingers 14 are moved into plate lifting positions. Through the prestressing of the Belleville springs, the configuration of the cam surface 41 and the contacting surfaces of the hook members 7 and the actuator arms 8, the fingers 12 engage the recesses with a constant predetermined lockup force. The fingers 51 of each lock-up set are carried by two spaced members 50, Figs. 2, 3 and 9, which incorporate apertures 54 and a projection 59 and are disposed in the associated groove part 22 such that they are slidable horizontally as viewed in Fig. 3. The members are biased outwardly into positions of finger and plate disengagement by springs 53 which are mounted in the apertures 54 and abut clamp supports 26. A non-rotatable adjustment bar 57 is slidable longitudinally behind the members 50, Fig. 3, such movement deriving through interengaging bevel gear wheels 62, 63, Figs. 2 and 4, and their respective rotatable carrier members 60 and 63<SP>1</SP> from the rotation of a readily removable manuallyoperable key 65 connected to the member 63<SP>1</SP> whenever necessary for plate adjustment purposes. The member 60 is threadedly engaged within a screw-threaded end portion 61 of the bar 57 and this bar carries two readily replaceable and interchangeable inclined cam surfaces 58 each of which co-operates with the projection 59 on a member 50. The members 50 are held in the grooves by screw-fixed cover-plates 71. In order to accommodate various plates the bars 57 may be adjustable in length and if necessary spacers may be provided along the length of the shaft 40 between the clamping units and supports. In a modification, Fig. 12, the self-contained clamping units embody cantilever interleaved leaf-type springs 102.