US915749A - Carriage-moving device for type-writers. - Google Patents

Description

H. DREWELL. CARRIAGE MOVING DEVICE FOR TYPE WRITERS.

' APPLIOATION FILED JULY 17,1907.

Patented Mar. 23, 1909.

as g a an ii ii ii ii ii ii ii uuuuuuu WITNESSES W UNITED strains p TE Ntr oFFIo HEINRICH DREWELL, OF CHARLOTTENBURG, GER-MANY, ASSIGNOR TO- SCHNELLSETZMA- SGHINENGESELLSCHAFD MIT BEStIIRliNKTER HAFTI NG, OF BERLIN, GERMANY.

CAI-RRIAGE-MOVING pEvIcE Fo'n TYPE-WRITERS.

Application filed July 17,.190'7. Serial No. 384,219.

To all whom it may concern:

' Be it known that I, HEINRICH DREWELL,

subject of the German Emperor, residing at Charlottenburg, near Berlin, Germany, have invented new and useful In; rovements in Carriage-Moving Devices ype-VVriters, of which the following is a specification.

The present invention relates to a device for adjusting the movement of the papercarriage of ty ewriters and similar devices.

It frequent y happens with typewriters, particularly if the movement of the papercarriage is not uniform, but varying corresponding to the widths of the typewritercharacters, that the iiarriage-pointer is to be set at a point of the line which can either not be reached at all or only with difliculty by means of the shifting.device.- In such cases, in devices used hitherto, the paper itself had to be loosened and displaced on-the platen. roll. This isa particularlyrisky proceeding,

when several sheets of paper are placed one on another in order to obtain several co ice at once. In the case of typewriters w 1ich are arranged with systematic-shifting of the carriage, that is with a carriage moving device (pushing the carriage in steps of differ ent wi ths in correspondence to thedifferent width of the types, returning the carriage back into position is particularly troublesome, this being necessary, for example, when.

one or more letters have to be erased.

u ow an important object of the present invention is a device: for removing the above mentioned defects which substantially consists of a device for adjusting the position of the carriage, a screwed spindle being employed instead. of the customary rack. Either an escapement mechanismwhich' is known in itselfor a toothed wh eel can work on this screwed spindle; in case a wheel is employed it must be formed as a worm-wheel.

When writing, the male screw operates together with the escapement mechanism or toothed wheel exactly'in the same manner as the hitherto customary rack. If, on the contrary, the carriage is to be shifted Without depressing thekeys, this can be effected byrotating the spindle.v In consequence of the gradual motion of the carriage this adjustv ment can be effected exactly to any optional oint, both forward and'backward. The adpistment is inde endent of the cseapement mechanism and t e operation of the escape- Patented March 23, 1909'.

ment mechanism is also independent of the operation of the screw., r

, In the case of systematic shifting of the carriage a gradation of the width of the letters according to units takes place as arule. Now if the carriage is tobe shifted backward and set at a definite place on the line, this adjustment must be effected exactly according to the corresponding gradations when the carriage was moved forward Inorder to snake this -PQfifilbla toothedyheel is arranged on the end of the spindle," is the aps of the teeth of which a spring-pressed pulIey engages which limits the movement of'the toothed wheel and spindle. This device does not difler in the manner in which itworks from those which are employed in known typewriters for shifting the carriage along the lines.

In order that the invention may be clearlyunderstood reference is made to the accompanying drawing in which two embodiments are represented by way of example, and in which: r

Figure 1 shows a screwed-spindle in corn bination with a sim le escapement in elevation; Fig. 2 is an e ovation of a device for graduating the-adjustment of the carriage, whereas Fig. 3 is an elevation showing the combination of the male screw with a wormwheel, and F ig.4 is a cross-sectionin a plane at right angles to Fig. 3.

A spindle a rovided with a male thread is mounted revo ubly, but not displaceably, in the paper-carriage 0, the latter (as shown in 'Fig. 3,) running on wheels 2 on'the machinelrame 2.

r In the form of the device shown in Fig. 1,

two detents or catches. band c of suitable shape according to the form of the male thread engagein the same. One of them c is arranged on a lever 11 rocking around a fixed pivot 91, this lever d being moved by the keys of the typewriter in any, known manner. The catch 6 is providedon a slide 7: which can be dis laced longitudinally on the lever slide with s ots r over the pivot g and a second pivot f attached to the lever (Z. The length of the slots 1". corresponds to"the way' the rarriage is shifted each time a key is depxessed. When the keys which are not represented in the drawing are depressed the love (Z is pulled downward at the right end and the catch 0 engages with the thread or the spinnow follows the pull of the drawband which is arranged as usual and the drawing, and moves to the left, driving the catch 1) and the which is not shown slide it against the actionof the spring e. The amount of this movement is determined by the lengths of the slots 1' in which the-pins g and f slide. This escapement only differs from the usual form in combination with racks by the form of the catches c and I) being suited to the shape of the male thread. It the carriage 1s 1 to be moved forward or backward without depressing a key, this can be efl'ected by rotat-in the spindle by means of a small hand i fastened to the end of the spindle.

whee in this case the tooth b of the escapement acts in a certain sense as a stationary nut for the screw (1 In order to enable the carriage to move step by step in smaller steps st p at a time from line than those corresponding to the pitch of the screw (I, as already mentioned device is that on carriages or used whit-lids similar to known typewriters for moving the paper a to line. This device consists of a toothed wheel 72 placed. on the spindle (I, in the teeth of which wheel a pulley '& engages which is mounted in the forked end of a lever mounted with its other end rovoln bio on a pivot a. This lever is pressed by a spring t" against the teeth of the .wheel la. and gives a The above described escapement can only be employed in typewriters in which the carll, on the con-.

rings is shiftcdnniformly. trary, systematicshiitmg is to be employed with diil'erent widths ol letters it is proton able to employ a spindle provided with a male thread in combination with. a wormwheel, and to place a toothed wheel, which i can be shifted in the dillcrent stops, on the axle of the worm-wheel;,l igs. 3 and 4; show one form of such a device. A worm-wheel l engages in the niale thread a and can rotate round a pivot 11. is also a toothed wheel m attached which is provided with two sets of teeth a at, one on ea h side. Further, a swinging arm 1) rotates round the pivot to to which a pawl s is fastened. This end of the 1 tactile blow for rotating the 5 wheel I! step by step when adjusting the= On this pivot there l The teeth have the form of cogs.

-, pawl engages in the teeth it of the wheel m. 'ii hen a key is depressed the pawl is raised out oi the'teeth by the action ot a bellcrank lever r mounted rcvolnbly onfa pivot '1 fastened to the machine-iraine .2", wherei upon the arm p follows the pull of a spring 1 20 attached to it and to the .l'ran'ie ol' the carriage until it hits against one olf stops (1 mounted movable in the frame ol the me.-

i chine; these stops g are also moved, when the keys are depressed, by means of the levers q in such a manner that one of them 1 comes into the path of the rocking lover p each time. The amount ol the oscillation of E the arm p is determined by the position of the pins When the keys are released the boll-cran; lever '0 returns and allows the pawl s to fall again. into the teeth m of the wheel in, wherehv the arm )1 connected with this wheel. The arm p now follows the movement oi this wheel which is under the action of the carriagedrawband of the typewriter. During the depression of a key the wheel m is held in position by a special detent 3 which is arranged on the boll-crank lever o and which engages in the second set of teeth ft of the wheel 111.. When the keys are released this delont releases the wheel m. The number of the pins and their po- 5 sition and distance from one another depend g on the number of the steps and the amount i ol" the shii'ting which is to be ell'ected when each key is depressed.

When the carriage is shil'ted without depressing the keys-the spindle (1 acts in this i device as a screw and the worm-wheel l as a lived nut, whereas when writing the spindle operates as a rack and the wheel I as a gearwheel. In this device also the spindle a can be used in combination with the device represented in Fig. 2-.

he advantage of the invention consists in the carriagebeing able to be pushed for- What I. claim as my invention and desire l to secure by Letters Patent is:-

1. In a typewriter and like devices the combination ol. a frame, a carriage movable thereon, a spindle provided with a male l and set at every point in a lme. l

and cscapeinent mechanism engaging in the male thread of said spindle, as set forth, for l the purpose specified. i 2. In a typewriter and like devices the combination of a frame, a carriage movable thereon, a spindle provided with a male thread revolubly mounted on said carriage, i a worm wheel engaging in the male thread of said spindle, a ratchet wheel attached to the axle of said worm wheel, and ratchet mechanism operating on said ratchet wheel. 3. In a typewriter and like devices the l combination of a frame, a carriage movable lthereon, a spindle provided with a male thread revolubly mounted on said carriage.

thread revolubly mounted on said carriage; time pins mounted in said frame movable a worm-wheel engaging" in said spindle, a by theaction of the keys, and a fixed stop ratchet wheel attached to the axle of said both the pins and the stop limiting the worm-wheel and pro'vided with two sets of movement of said swinging arm. 1.5 cogs, aswinging arm rotating around the axle In testimony whereof I have signed my of the worm-wheel, a pawl connected to said name to this specification in the presence of arm and engaging in one set of said cogs, a two subscribing Witnesses.

bell-crank lever mounted revohibly onthe HEINRICH DREW ELL. said frame, engaging in the other set of said Witnesses: cogs and bringing said pawl out of engage- HENRY HASPER,

ment with the ratchet whcel'at the same WOLDEMAR HA UPT.

Images