Patent GB-292843-A (GB)
Title: A typewriting machine for use with languages having oppositely directed orders of writing
IPC: B41J19/14
Filed: 1927-11-23
Abstract: 292,843. Rheinische Metallwaarenund Maschinenfabrik S÷mmerda Akt.-Ges., and Goldenberg, B. Z. Nov. 23, 1927. Letter-spacing mechanism.-In a reversiblespacing arrangement, a guide pulley for the spring-drum cord is mounted in a bearing which is secured to the framework or is permitted to abut on the carriage to cause traverse of the carriage in one direction or the other, the arrangement being such that the bearing when released from the framework is moved by the cord into abutment with the carriage; the securing-means for the bearing may be controlled by platen-shift mechanism which may control also means for placing either of a pair of feed-racks in engagement with the escapement pinion. The mechanism shown in Figs. 1 and 12 is applied to a platen-shift machine in which each type-lever is provided with four types, the two lower and the two upper types being upper and lower case types for two languages having normal and reversed spacing respectively. The cord 4, Fig. 1, of the spring drum 3 is connected to a bracket 5 on the carriage 1 and passes over a pulley 10 mounted in a bearing 11 which normally abuts on and is supported by the shouldered ends of arms 8, 9 on the bracket. Normally the pulley is ineffective and the cord propels the carriage towards the left (i.e. towards the right in Fig. 1 which is a rear view). For propelling the carriage towards the right (i.e. towards the left in Fig. 1) the bearing is secured to the framework 2 by means of a slide 19, the pull of the cord being thereby reversed. The slide moves vertically on studs 23 and has a lug 18 for engaging a slot 17 in a lug 27 on the bearing, the faces of the lugs being bevelled. The slide is held in raised position by a spring 24, and the platen-shift frame 33 is provided with a yielding abutment 37 for engaging a lug 41 on the slide. When either of the two lower sets of types is in use and the carriage is moved into the end position, the slide is depressed by the abutment and the lug 18 is prevented from entering the slot 17. When, however, either of the two upper sets of types is in use and the carriage is moved into the end position, the abutment is ineffective and the lug 18 is permitted to enter the slot 17 and retain the bearing, the feed of the carriage being thereby reversed. The abutment is formed on a rod 36 which is mounted in lugs 38, 39 on the shift frame and is held in normal position by a spring 40. The carriage is controlled by an escapement co-operating with an escapement wheel 43, Fig. 12, which rotates in the same direction for both normal and reversed feed, the shift frame 33 opera.ting means for moving either of two racks 45, 46 into engagement with the feed pinion 44 to effect normal and reversed feed respectively. The racks form part of a frame 47 which is movable vertically on the carriage and has pins 54 engaging slots in bell-cranks 50 which are pivoted on the carriage and have pins 52 engaging slots 55 in the end plates 31 of the shift frame. The slots have two vertical parts connected by a bend 53, so arranged that on shifting from either of two lower sets of types to either of the two upper sets, or vice versa, the rack 46 or 45 is engaged with the feed pinion. In some cases the slots are formed in the bell-cranks and engage pins on the shift frame. To permit of the employment of the two upper sets and the two lower sets of types for two languages having normal and reversed spacing respectively, the slide 19 is arranged at the other end of the machine and is adapted on being depressed by the abutment 37 to retain the bearing, the slide being retained in depressed position by friction or by means of an automatically-releasable hook on the lug 18; moreover, the spring drum is reversed and the direction of the bends 53 is changed. Line-spacing mechanism. - The line-spacing lever can be moved in either direction to return the carriage towards the right or left according to whether the letter-spacing mechanism is employed for normal or reversed spacing. In the mechanism shown in Fig. 15. the line-spacing lever 58 has a head formed with two slots engaging pivots 60. 61 and can be rocked to the right or left on the pivot 60 or 61 to return the carriage towards the right or left. The linespacing lever engage the head 64 of a lever 62 connected to a rocking arm provided with a pawl co-operating with a ratchet-wheel 69 on the platen 30.