Patent GB-765435-A (GB)
Title: Improvements in or relating to photographic type-composing machines
IPC: B41B23/06
Filed: 1955-03-11
Abstract: 765,435. Photographic type-composing. MERGENTHALER LINOTYPE CO. March 11, 1955 [April 13, 1954; Oct. 8, 1954], No. 7165/55. Class 98(1) To correct a film on which text matter has been printed in a photographic type composing machine and in which the text matter includes erroneous lines, the original incorrect film is severed to remove an incorrect portion thereof and leave the film in two sections, one section of the original film is spliced to a correction film containing a correct portion to replace the incorrect portion removed from the original film, the thus newly formed film strip is severed so that only the correct portion of the correction film is spliced to the first mentioned section of the original film, and the other section of the original film is spliced to the correct portion to form a corrected film. As shown in Figs. 2 and 3, the original film containing erroneous lines is wound on reel 21 and drawn over the mechanism tables 22: and 23 to a take-up reel 24. A second film, consisting of corrected lines of , text, is. wound on a reel 25 adjacent to the reel 21. Both films have marginal perforations 27 for locating the lines. The film 20 may be clamped to the table 22 by a transparent pad 31. Both pad and the forward part of the table 22 are transparent, so that the film may be inspected when illuminated by a lamp 28 below the table. Pad 31 is carried on an arm 32 keyed to a rocker shaft 33 journalled in film guides 34 and 35 at the sides of the table 22. A handle 36 is mounted at the outer end of the rock shaft 33, and depending therefrom is a member 37 which extends between a rigidly fastened roller 40 and a displaceable roller 41, which is spring urged towards roller 40. When the handle 36 is turned to clamp the film, the member 37 is grasped between the rollers to hold the clamp in position. Similar mechanism is provided for clamping the film 26 to table 22 as it is unwound from reel 25. Behind the clamp 30 is a second clamp 45, Fig. 7, carried by a forked arm 46 pinned to a rocker shaft 47. Clamp 45 is operated by a handle 57, which urges a member 54 between a fixed roller 53 and a roller 52 mounted on the arm 51 connected to the forked arm 46. Member 54 forces the rollers apart, rocking the arm 46 against action of spring 60. As shown in Figs. 3 and 7, table 22 moves along the frame of the machine on rollers 62 and 64. Rollers 62 are mounted on an angle and ride on a bevelled rail 63, while roller 64 rides on a flat rail 65. The table 23 is similarly mounted by rollers 74, 75 and rails 76, 77. The tables 22, 23 are moved between the operating positions by means including a sprocket 83, Fig. 6, driven through a sprocket drive from a handle 85, Fig. 2. Sprocket 83 is mounted on a shaft 86 journalled in the apparatus frame. A sprocket 104 is loosely mounted on the shaft 86, but may be connected thereto by means of a disc 108, pinned to shaft 86, and carrying a slidable pin 103. Pin 103 is engaged by a spool 101 slidable on shaft 86, and may be moved when the spool 101 slides along the shaft into engagement with the sprocket 104. A second sprocket 92 may be locked to the shaft 86 by a disc 89 carrying a pin 91 controlled by a slidable spool 90. The spools 90, 101 are controlled respectively by solenoids 94, 102 through a T-bar 95 linked by pin-andslot connections to levers 97, 105 engaging the spools. Energization of one of the solenoids causes the corresponding sprocket to be disengaged from .the shaft 86. In this way, both the tables 22, 23 are normally moved together by the drive mechanism, but either can be disengaged at will. Apparatus for cutting the film, and also for welding it, is carried on' a frame extending the full length of the tables and comprising stanchions 110 connected by a web 111. In a normal position, the frame is urged by a compression spring 114, Fig. 3, against a stop lever 112. Movement of a handle 115, through action of a multiple cam, removes stop 112 from the path of the stop 113, and allows the frame to come to rest against one of two screw stops 121, 131. These stops are adjustable in accordance with the point size of the type by knobs 124, 134, and are arranged to bring the frame into position so. that the knife or welding apparatus may operate either above or below the line of type. Film locating teeth 141, which' in the normal position of the frame engage the perforations on the films, are retracted in the second and third positions of the frame. The film cutting apparatus is shown in Fig. 8. A rotary solenoid 147 operates a shaft 144 journalled in the web 111. This shaft 144 has a pair of eccentrics 151 at its ends, each eccentric being connected by a link 153 to a knife holder 152 slidable by a pin- and-slot connection on the web 111. A cutting edge 157 is mounted on the holder 152 to cut the film in co-operation with a stationery cutting face 160. A resilient stripping member 163 is mounted opposite .the stationary edge 160. The welding apparatus (Fig. 7) is similar to the cutting apparatus except that the heating elements 164, 165 are provided in place of the knife 157 and the cutting surface 160. In operation the films are placed on the reels, film 20 is advanced across the table until the incorrect line is located by the pins 141, and the film 26 is advanced until the correct line to replace the incorrect line is similarly located. Handles 36 and 57 are thereupon actuated to clamp the films to tables 22 and 23. The dials 124, 134 are set in accordance with the point size of the line to be replaced in film strip 20. Handle 155 is moved to the second position in which the film is severed at the foot of the incorrect line, by depressing a push button which energizes solenoid 147. Handle 155 is then moved to its third position, whereupon by again depressing the push button the film is severed above the incorrect line, which is thus completely severed from the film. Another push button is depressed to energize the solenoid 94. When crank 85 is turned, the rear table 23 only is moved, so that the film 20 thereon is brought into abutting relation with the film 26. A pawl and detent facilitates correct location. Upon pressing another push button, the film 20 is welded to the film 26. Both tables are then transported to bring the spliced film to the cutting station, whereupon it is severed at the foot of the correct line. Finally, the front table is moved to. bring the film reels into their original positions, and the front and rear tables are moved together to bring film 20 to the welding station. The part of film 20 to which the correct line has been welded is then welded to the remaining portion of film 20. The films are then brought to their original positions and unclamped, when they are ready for any further correction operation which may be necessary. In a second embodiment of the apparatus, many of the functions are carried out automatically. Power drive to the tables. An electric motor 503, Fig. 16, operates through belt and pulleys 504 and speed reducing unit 505 to rotate spur gears 506, 507. Gear 507 drives a shaft 510 through a one-revolution clutch 512, which is controlled by solenoid 513 in such a way that when the solenoid is actuated the clutch is engaged for one revolution of the shaft 510. Shaft 510 terminates in a channel member 526 which encloses a roller 527 mounted on a gear 530. The arrangement is such that the gear 530 is driven at a speed which varies during each revolution; this ensures that the tables slow down as they approach their rest positions, thereby. facilitating the engagement of pawl and detent means. Gear 530 drives a gear 533 directly and is connected by shaft 531 to a gear 532 which. through an intermediate idler gear 535. drives' a gear 534. The gears 533, 534 therefore rotate at equal speeds in opposite directions. By an arrangement similar to that shown in Fig. 6, either of these gears can be connected to a driving shaft for, driving the tables selectively. Film severing and welding apparatus. The movement of the swingable frame carrying the cutting apparatus is controlled by a cam 184 (Fig. 13) and a follower roller 185. Roller 185 is mounted on a lever 186 which is pivoted on a shaft 187 and linked by a link 190 to the stanchion 182 of the swingable frame. When the cam 184 rotates and roller 185 rides off its high point, a compression spring 192 urges the frame forwardly until movement is arrested by the abutment of an intermediate stop 193, roller 194 and a web member 195 of the frames. This is the intermediate position for the swingable frame in which the head cut or slice is effected. The exact position is regulated by stop 193 which is adjustable in accordance with the point side of the line being replaced by means of a dial 197. Roller 194 is mounted on a stop arm 207 linked to a bell crank lever 210, pivoted at 213, and having on an arm carrying a cam follower roller 211 urged by a spring 215 against a cam 212, which causes the roller to be withdrawn from its position between the stops 193, 195. This allows the frame to move to another position, in which it engages another screw stop adjustable in accordance with the point size of the line so that the cutting or welding operation is made at the foot of the line. The cutting and welding units are mounted on the swingable frame, and are similar to those incorporated in the first embodiment. Sequencing mechanism. The motor 503, Fig. 16, drives the gears 263, 264 as well as the gears 506, 507. Gear 264 is connected to bevelled gears 266, 280 to a toothed clutch 265 which is engaged only when the starting solenoid 273 is energized. Each energization of the solenoid engages the clutch for one revolution. An electromagnetic switch 275 is operated by the shaft 191 whenever a cycle of operations is completed, and contacts on the switch are used to operate a pilot lamp to show that the apparatus is functioning. T