Patent GB-763435-A (GB)
Title: Improvements in or relating to apparatus for splicing cinematograph film
IPC: G03D15/04
Filed: 1952-03-14
Abstract: 763.435. Kinematograph film splicers. KRAL, K. B. March 11, 1953 [March 14, 1952], No. 6672/52. Class 98(2) The splicer includes a pair of clamps for holding the film to be joined in end-to-end alignment, means for trimming the ends, a platform between the clamps for supporting the trimmed end held in one of the clamps, and a scraper for removing gelatin from a trimmed end carried by a slide for reciprocation across the film parallel to the trimmed end and adjustable towards and away from the platform to regulate the depth of cut, the scraper being loaded so as to give to a limited extent in the direction of movement when reciprocated across and in contact with the film on the platform. As shown, two filmholding assemblies 14, 15 are arranged side by side on a base 10 and each comprises a platform 16 with upstanding film-locating pins and a presser plate which can be closed on to a film lying on the platform, both of these assembly elements being journalled about a horizontal axis 13 so that by means of a cutter 28 associated with the platform of each assembly the films may be trimmed so as to provide the requisite joining overlap. The base 10 sliddirectly above a bar 23 extending along blade 36 which is constrained to move ably carries a scraper device including a the base at right angles to the axes of the platforms and which is adjustable to vary its depth of cut so as to remove the gelatin layers on that portion of the film which 'is to be overlapped while this is gripped in its assembly close to but clear of the bar, as by leaf springs 29 carried by the presser plate which is cut away to be clear of the bar. The presser plate for the assembly 15 which engages the overlapped film portions has at its inner end a spring-loaded film-presser block 33 which can rock against spring action to avoid undue pressure on the film joint where the block first engages it, the block 33 being carried by loosely-fitting retaining guide pins which are carried in a block 32 (Fig. 5, not shown) fixed to the presser plate. Preferably also an adhesive-apply. ing means formed as a self-contained unit is bodily slidable on an upstanding guide 72, the unit being used after having swung the assembly 15 up to a position determined by a stop 26 on the presser plate 19 to which the platform 16 is spring- latched, the adhesive being transferred from a container 54 by a disc 56 (Figs. 5, 6 not shown) which rotates partly in the adhesive and which transfers it to a second disc 61 which applies it to the rear face of the overlap portion of the film, said discs being driven by gearing from a pinion engaging a stationary rack on the guide 72. The cylindrical adhesive container which is laterally adjustable has a filler opening closed by a rotatable cylindrical cover having a registering opening. As shown in Fig. 4, the blade 36 is carried on a slide 4 by being screwed to a bolt 38 freely rotatable in an eccentric sleeve 53 which is rotatable by a spanner to adjust the depth of cut, unequal wear on the blade being avoided by allowing the blade to " turn over " at the end of each cut due to springs 47 (Fig. 3, not shown) secured to a pin 45 on the blade and riding in a slot 46 on the slide. For scraping the film, the slide is movable by means of a rod 48 secured to it passing through the base 10 along guide pins 52 against return springs 51.