Patent GB-412557-A (GB)
Title: Typewriting machine, the frame or casing of which has a sounddeadening action
IPC: B41J29/08
Filed: 1932-09-24
Abstract: 412,557. Typewriters. FISCHER, O., Kappelhof, near Friedrichshafen, Wurtemberg, and INHOFFEN, W., 24, Maassenstrasse, Berlin, both in Germany. Sept. 24, 1932, No. 26601. Convention date, Oct. 9, 1931. [Class 100 (iv).] Sound deadening cases.-Typewriter framework comprising a base-plate 75 and a closed top 245, Fig. 1, is separated from a base 507 by sound-deadening material, and is partly enclosed by walls 514 which are supported on the base by sounddeadening material and extend up to the closed top of the framework, the paper-carriage and keyboard being outside the walls. The walls preferably rest on felt pads on the base and are secured by means of hooks 517 engaging felt pads 518. Air gaps 515, 516, or insulations of felt or rubber may be arranged between the side walls and the typewriter framework. The walls may be lined with sound deadening material 519. The base plate 75 may rest on felt or rubber cushions or on leaf springs 510, and may be connected to the base by means of screws 512, 513 which pass through enlarged holes in the base, the holes being preferably lined with felt or rubber. The base may be provided with cushion-feet 508, 509 comprising leaf-springs 508<1>, 509<1>. The base, base-plate, and walls may be made from pressed material such as that known under the Registered Trade Mark "Bakelite." The Specification as open to inspection under Sect. 91 includes also the following subjectmatter, which does not appear in the Specification as accepted :- Relay type-wheel actions ; case-shift mechanism; shift-key actions; keys; type-wheels.-These mechanisms and devices, with the exception of the shift-mechanism described below with reference to Fig. 23 (Cancelled), now form the subject-matter of Specifications 407,949,412,567, 412,568 and 412,570. Each shift-key lever 156, 157 is connected by a slotted link 159 to a yoke 154 which is pivoted at 182 and has an extension 164 connected by a rod 160 to the shaft 2 of a type-cylinder 12 having six circumferential rows of types. The yoke is provided with a member 168 normally engaging a pad 169<1> carried by a pin 169 which abuts on a stiff spring 170. A pivoted dog 199, co-operating with a stepped block 198 on the yoke, has a pin 204 engaging hooks 202 on the shift-key levers. On depression of either shift-key, the dog is displaced, the yoke is raised to shift the type-cylinder, and the hook releases the dog and permits it to engage one of the steps of the block 198, the type-cylinder being thereby arrested in position for printing from the third or fifth row of types. For automatic single-row shift, one of each pair of character-key levers energizes an electromagnet having a rotary armature provided with a pin 194 engaging a dog 191 on a yoke 180 pivoted at 182, the dog co-operating with notches in a member 193 on the yoke 154. On energization of the electromagnet, the dog is rocked into engagement with one of the notches, and thereafter rocks the yokes 180, 154 to effect shift. The dog 191 has a pin 201 for releasing the dog 199. The movements of the yokes 180 are limited by engagement of a blade-spring 184 thereon with adjustable stops 185, 186. Letter-spacing mechanism.-An escapementwheel co-operates with fast and loose dogs carried by separate rockers, the loose dog being provided with alternative stops for single and double spacing, and being automatically releasable from the escapement wheel on return of the carriage. An escapement-wheel 226, Figs. 28, 30, and 32 (Cancelled), geared to a spring drum 224 which gears with a rack on the carriage 221, co-operates with a dog 227 pivoted on a rocking bail 228, and a dog 236 formed on a rocking frame 238. A finger on the frame 238 co-operates with a plate 233 on the pivot 234 of the dog 227. The frame 238 co-operates with a rod 240 operated by the space-key, and a finger on the rocking frame of the type-cylinder. On operation of the spacekey or the key-levers, the dogs 236, 227 move into and out of engagement with the escapement-wheel, and the bail 228 is rocked by a spring 230, movement being normally limited by co-operation of an extension 259 of the pivot 234 with a stop-hook 260<1> formed on a bellcrank 260. On return of the space-key or type-cylinder, the dogs 236, 227 are disengaged and engaged, and the carriage is permitted to make a single-space movement. For doublespacing, the dog 227 is arrested by a stop 271, the stop-hook 260<1> being rendered ineffective by manually displacing a slide 269 which is mounted on the top plate 245 and co-operates with the bell-crank 260. During doublespacing, premature re-engagement of the dog 227 is prevented by co-operation of a pin thereon with a lever which is mounted on the slide and is rocked by the frame 238. When the carriage is returned, the dog 227 is held in released position by a pin on a link connected to a lever 242, Fig. 33 (Cancelled), which is frictionally connected to the spring drum and passes through a short slot 242' in the top plate 245. When the hand is released from the carriage, the lever 242 is returned and the dog re-engages the escapement-wheel. The lever may be locked in releasing-position by means of a latch 246, the dog being thereby prevented from re-engaging, and the carriage being permitted to run to the left so that further typing is prevented. The latch may be associated with the bottom-margin arrangement described below. Back-spacing mechanism.-The escapement dog 227, Fig. 32 (Cancelled), is operated for back-spacing by means of a bell-crank 261, 263 connected by a link 264<1> to the back-spacing key. The arm 263 has a pin 266 for disabling the stop-hook 260<1>, and an extension 262 for permitting a detent 265 to engage the escapement wheel 226 during back-spacing. Carriage-releasing arrangements.-A releasing- bail 279, Figs. 28 and 30 (Cancelled) pivoted in a yoke 281 has a finger 282 for engaging an extension of the escapement dog 227. An arm on the bail abuts on a lever 300 connected to a bell-crank 297 co-operating with a flanged rock-shaft 294 which is mounted on the carriage 222 and engages a lever 283. On depression of a knob 2911 on the lever 283, the finger 282 releases the dog 227, and the carriage can run freely. A nose 285 on the bail 279 co-operates with a lug 284 on the bail 228 to prevent movement when the dog is released. Keyoperated tabulating-stops 278 have shoulders co-operating with the bail 279 to release the carriage. Carriage brakes.-On release of the carriage, a plunger, Fig. 30 (Cancelled), is moved into engagement with the carriage-rail 223 by means of a lever 287 which is connected to the bail 279 by means of a spring-wire lever 289. Line-locking devices.-When the carriage reaches line-end position, a contact in the machine circuit is opened to prevent further operation. For this purpose, a line-locking stop 305, Fig. 36 (Cancelled), on the carriage co-operates with a stop-pin 301 on a bail 306 having a pivoted dog 307 for depressing a lever 309 provided with a contact 310. The lock can be released by means of a key which is connected by a link 312 to the dog depression of the key rocking the dog and permitting a spring 314 to restore the contact-lever. The carriage is arrested in starting position by co-operation of a stop 303 with the stop-pin 301. On abnormal depression of the releasekey, the dog 307 engages a pin 318, and the stop-pin is depressed to permit of the carriage being moved into position for writing in the margin. After a few characters have been typed, the stop 303 again co-operates with the stop-pin, and the contact 310 is opened to stop the machine. Margin stops.-When the bottom margin of the paper is reached, a bail 249, Fig. 33 (Cancelled), controlled by the paper 255 operates the escapement latch 246, and thereby permits the carriage 222 to run to the left to prevent further typing. The bail has an arm 249<1> co-operating with a bell-crank 253 which is pivoted at 252 on the carriage and has a pin 254 for engaging the paper passing over the platen 17. Engagement can be prevented by a hand-lever 256 having an arm engaging the bell-crank. When the lower edge of the paper passes the pin 254, the bell-crank releases the bail the latch 246 is depressed, and after return of the carriage, the escapement dog 227, Fig. 28 (Cancelled), is held in disengaged position, the carriage runs to the left, and further typing is prevented. To permit of typing in the bottom margin, the hand-lever 256 is depressed to raise the bail 249 and thereby release the latch. Paper-supports.-The platen is detachably mounted by means comprising pins secured to an end plate and engaging holes in a plate carried by a spring-urged spindle whch can be pulled outwards by means of a knob, movement being normally prevented by engagement of the end plate with a finger on the feed-roller bail.