Apparatus for registering printing plates in multi-colour work and for analogous purposes

摘要

380,911. Printing- surfaces. SHIRLOW, A. E., Flower Street, Caulfield, near Melbourne, and McDIARMID, T. B., Hardware Street, Melbourne, Australia. Aug. 18, 1931, No. 23206. [Class 100 (ii).] In apparatus for registering printing-plates in multi-colour printing and the like, mechanism is provided to register in sequence the printing- plates, having incorporated therewith traversing means to move it in a lateral and a longitudinal manner over a table on which the plates are positioned. The table 3 carries raised guideways 7, 8 in which is slidably mounted a transverse guideway 40, longitudinally adjustable by rotating a screw 11. One end of the guideway 40 is attached to a saddle 18 which slides in the guide 8 and carries a traversing collar 16, Fig. 5, for engaging the screw 11 the collar being attached to a spindle 17, which is formed with an annular groove 28 engaged by a pin 29 fixed to a knurled cap 20, which is held in position by an outer flanged member 21 provided with a vertical slot 30 in which engages a horizontal pin 31 screwed into the cap 20. A spring 27 normally maintains the collar 16 in engagement with the screw 11 but for rapid movement the cap 20 is raised in the member 21 until the pin 31 is clear of the slot 30 when on a partial rotation of the cap 20, the pin 31 rests on the upper surface 21a of the member 20 to hold the collar 16 out of engagement with the screw 11. The guideway 40 carries a second saddle 60, traversed by a screw 54 through means similar to the saddle 18, and mounted on the saddle 60 are pointers 64 and a parallel rule 102. The pointers 64, which are normally maintained out of contact with the plate by springs 79, depend from racks 65 which engage pinions 69, Fig. 4, mounted in rotatable blocks 66 on the saddle 60, and both the pinions 69 and blocks 66 are capable of being locked in position by wing nuts 74. Magnifying glasses 117 permit the positions of the ends of the pointers to be accurately observed. The parallel rule 102 is adjustably attached to a felt-lined plate clamping bar 85 and can be locked in position. The clamping bar 85 is carried by arms 87 passing through sleeves 89 carried by the saddle 60, and attached to a crosspiece 92, capable of being raised against the springs 90 by a knurled nut 97. The guideway 40 moves on the saddle 18 and wheels 42, and can be locked in position at one end by a lock-nut 38 and at the other end by a knurled nut 48 engaging a screw 46, passing through a boss attached to the guideway 40 and formed with a T-piece 46a engaging the guideway 7. The saddle members 18, 60 carry indicators 109 operating over scales on the guideways 8, 40, the readings being taken through magnifying glasses 110, and the rotatable blocks 66 have indicators moving over segmental protractors, all scales being finely calibrated to permit accurate registration when a large number of plates in sequence are used.