Patent GB-761602-A (GB)
Title: Apparatus for carrying out a photographic transfer process
IPC: G03D9/00
Filed: 1954-05-07
Abstract: 761,602. Photographic transfer-processing apparatus CHEMISCHE FABRIEK L. VAN DER GRINTEN N. V. May 7, 1954 [May 8, 1953], No. 13418/54. Class 98(2) Of a pair of co-operating press rollers between which an exposed light-sensitive sheet and a receiving support material are passed to effect image transfer, at least one of the rollers, constituting a transport roller, is driven partly immersed in processing liquid and is provided with a device for clamping the leading edge of one of the materials to convey this through the liquid against the roller surface before meeting the other material in the pressing zone between the two rollers, the device consisting of a (small) clamping roller pressing on the driven roller Or on the material therebetween and mounted for both rotation and for swing- ing in a yoke adapted to swing about the axis of the 'driven transport roller to be conveyed around with the latter along with the material, an abutment being provided for limiting the swinging of the yoke at a point prior to the pressing zone at which the two materials' meet. As shown both press rollers are driven, in Fig. 1, the beginning of the operation, the leading (lower) edges of materials 51, 52 from tables 31, 32 'are Just engaged between press roller 1 and clamping roller 11, and press roller 2 and clamping roller 12 respectively, and such leading edges stop clamping rollers 11, 12 from rotating by the drive, from press rollers 1, 2 and thereby cause the desired clamping of the materials , 51, 52 for conveyance with rollers 1, 2 through the processing liquid 10, at which time yokes 15, 16 carrying clamping rollers 11, 12 and mounted at their other ends as  by friction bearings on trunnions 4, 5- of press rollers 1, 2 swing around to the position shown in Fig. 4 where yokes 15, 16 are stopped from  swinging by abutments; 25, 26. At this point clamping rollers 11, 12 again rotate about their own axes by the drive from sheets 51, 52, which latter are projected upwards through pressing zone 3 between press rollers 1, 2 for image transfer and, finally, separation by hands 57, 58. Numerous alternative forms of apparatus -using this scheme of conveying one or both of the pair of materials through the processing liquid by press rollers are described, thus in Fig. 8 (not shown) separate but adjacent processing liquid reservoirs for the press rollers 1, 2 are provided and a third sheet material is driven, from beneath the reservoirs, upwards to be pressed at pressing zone 3 between materials 51, 52 and effect double image transfer at one operation. Figs. 5 and 6 (not shown) illustrate apparatus in which the press roller 1 only is partly immersed in processing liquid and provided with clamping features 11, 15, and co-operating press roller 2 is mounted in a position above and to one side of roller 1 and may or may not be independently driven; in Fig. 5 the second sheet material 52 is driven from beneath the reservoir upwards to reach the pressing zone, and in Fig. 6 it is slid from an inclined table 32 similar to that of Fig. 1 direct to the pressing zone. In use the yokes 15, 16 with their rollers 11, 12 may be swung by hand from their positions in Fig. 4 to the positions of Fig. 1, sheet materials 51, 52 placed as shown and rollers 1, 2 started to effect the operation; or mechanism may be provided by which the yokes 15, 16 attain their positions of Fig. 1 automatically, and with the aid ,of electrically operated stops (not shown) at the lower ends of tables 31, 32' to hold, initially. materials 51, 52 clear of the press rolls 1. 2, the operation may proceed on actuation of a switch. Sheet-feeding mechanisms may take the places of tables 31, 32; or one of the sheet materials 51, 52 used in the transfer operation, such as the receiving support, may be, in the form of a continuous web supplied, from a roll. Specifications 614,155, 654,630,. 672,844, 740,165, and 740,166 are referred to.