US984073A - Paper-carriage feed mechanism for type-writers. - Google Patents

Description

'1. E. BUSGHMANN. PAPER CARRIAGE FEED MEGHANISM FOB, TYPE WRITERS.

APPLICATION PILBD'SEPT.13, 1910.

Patented Feb. 14,191L.

3 SHEETB-SHBET 1.

Illlllll d way-masses T. E. BUSGHM'ANN. PAPER CARRIAGE FEED MECHANISM FOR TYPE WRITERS.

APPLICATION Flinn SEPT. 13, 1910.

984,073. Patented Feb. 14,1911.

3 SHEETS-SHEET 2.

T. E. BUSGHMANN.

PAPER CARRIAGE FEED MECHANISM FOR TYPE WRITERS.

APPLICATION FILED SEPT.13, 1910. 1

984,073, 7 1 Patented Feb. 14, 1911.

3 SHEETS-SHEET 3.

THEODGE EUGEN B-USCHMANYN, 0F CHEIVLNITZ, GERMANY, ASSIGNOR T0 WANDERER WERKE VORM. WINKELHOFER S: JAIENICKE, A. 3., OF SCI-IGNAU, NEAR CHEMNITZ,

, GERMANY, A GEItMAN FIRM.

PAPER-CARRIAGE FEED MECHANISM FOR TYPE-\VRITERS.

sec ors.

Specification of Letters Patent.

Application filed September 13, 1910. Serial No. 581,359.

To all whom it may concern:

Be it known that I, Trrnonon EUGEN BUSCI-I3L.NI\', a SUlJJQCt of the German Emperor, and residing at. Chemnitz, Germany,

have invented cerain new and useful I111- proements inPaper-Carriage Feed Mechanism for Type-Writers, of which the following is specification.

My invention relates generally to typewriters and a primary object is to provide improved mechanism which enables-spaced words to be written without having to strike the space key once or more frequently, after striking a-letter key, before the next letter is 15 r written.

' My invention relates more particularly to a paper carriage feed mechanism for type-.

writers according to a prior invention, in which a stepping pawl consisting of a single bar is mounted oscillatingly and also longitudinally displace-ably on the pawl carrier. This pawl having a twofold movement can be adjusted, according to my invention, in

such manner that it cannot at once engage the next tooth of the escapeinent wheel, but only the following one or the one thereafter. To this end, I connect with the escapemont wheel or with the paper carriage a c'ontro 'cannotinfluence the stepping pawl. If the controlling member which controls the pawl and only releases it when two or. more teeth have passed by it.

A detentmember, whose position is .determined by the controlling member and acts on the holding pawl having a twofold movement, coacts with the controlling member.

controlling member I preferably use a notcl" d disk or a star-wheel, with which the aember, preferably a roller, carried angle lever coacts. This detent roller 111g memberin such manner that it spacing mechanism is to ope ate, the detent roller is released and lies against the starwheel. It may then happen, however, that the star-wheel is not correctly positioned relatively to'thc detent roller so that a letter is first written with the ordinary spacing before the controlling memberand the detent roller occupy the correct relative ,posi- 'tions in order to influence the pawl for spaced copy.

An important obj'ect of my invention is toremedy this defect. I'do this by connecting ally held out of engagement with the the star-wheel adjustably with the escape-- ctaitrolling member so far that both these parts are situated in the requisite relative positions for typing spaced copy, and accordingly the copy is at once typedspaced.

My new apparatus is very simple in construction and, in addition, it has the further advantage that only one single key requires to be struck once in order to change over from typing ordinary copy to typing spaced copy, and reversely.

The subject-matter of my invention is represented by way of example in the accompanying drawings, whcreinz Figure l is a front elevation and Fig. 2 is a side elevation showing part of atypewriter provided with my improved paper carriage feed mechanism; Figs. 3 and at are front elevations showing the parts of the mechanism shown in Fig. 1 in-other positions; .Fig. 5 is a side elevation of part of the mechanism shown in Fig. 2,'but showing the parts in positions opposite to those in that figure; Fig. 6 is a side elevation, showing by way of example, one form of the controlling member applied to the paper carriage; Fig. 7 is a side elevation showing 'a modified form of my paper carriage feed mechanism, Fig. 8 is a plan of the principal and auxiliary levers employed 111 this modified form, while Figs. 9 and 9 show the auxiliary lever in side elevation and plan, respectively, and Figs. 10 to 16 are front elevations showing my feed mechanism in various positions requisite for explaining the mode of operation of the apparatus.

In the construction shown in Figs. 1 t0 5, the controlling member has the form of a staravheel amounted :axial'y at the side of, and rigidly fixed to the esc tpement wheel 6,. The periphery of this star-wheelie adapted to control a detent roller 6 mounted rev-- olubly on the arm a of a three-armed lever 0, cl, 6. In the'illustrative embodiment the point of each tooth of the star-Wheel a is situated -alpproximately in the radius of Patented Feb. MC, 1911. l

-movable cam-shaped slide 1 every second ratchet tooth of the escapement the arm 9 of a second three-armed lever, g, 71, 2 A strong tensioned spring In connects the arms 71, and c. 'The three-armed lever g /i, i is fulcrumed on a fixed pivot m, and its arm 2 rocks within the range of a pin 4 2 projecting from the side of a stepping pawl 18.

For the purpose of placing this mechanism into and out of operation I connect to one end of the arm 71. a (lownwardly-directed rod 0, whose lower end is guided, as shown in Fig. 2, by means of a slot on a fixed pin A. small distance above this slot the rod 0 carries a roller 9 which is adapted to be moved by the operation of a horizontally This slide 1 extends toward the front of the typewriter through the front frame plate of the latter where it is formed as a small indicator disk a. The camlider is operated by means of a pin t projecting from it and engaging with a reversing device u of known construction which is arranged to be moved from one position into the opposite position by means of a single key '0 each time the latter is depressed. The aforementioned spring is is suiticiently powerful to overcome not only the tension of the small spring 18 (Fig. 10) operating the stepping pawl 18, but also to resist both the friction of the entire mechanism comprising levers 'and other parts designated (2-12 and the weight and friction of the rod 0 with its roller 9.

The above described mechanisinoperates as follows :-In Fig. 4, to which Fig. 5 appertains, my character spacing mechanism is shown placed out of operation. roller g of the rod ,0 is depressed by the projecting part of the cam-slide 1', and the indicator 8 does not project through the front frame plate of the typewriter. In the position according to Fig. 4 the lever arm h is depressed and the lever arm 73 is raised, the stepping pawl 18 being unaffected. The lever arm 9 simultaneously holds its. c0- operating arm 03 of the other three-armed lover a, d, c in such a position that the detent roller 6 is kept outside the range of influence of the star-wheel a in opposition to the pull of the spring 70.

lVhen it is desired to se't'the mechanism for spaced matter the key 41 is struck in order to move the cam-slide 1", toward the tooth of the star-wheel a and the lever arm i The upon the pin 22, without however being able to d 'aw the stepping pawl 18 out of its engagement with the ese; pemcnt wheel 6 because, owing to the positive coupling of the two, three-armed levers by the cooperating pair of lever arms (7i 1]. the rigid limitation of the movement which the detent roller Z) has. found in bearing against the point of the tooth of the star-wheel extends to the 18 to snap into line with the next-following tooth space. Then as soon as the tooth released by the holding pawl on the release of the hey. the escapement wheel flies around in the :torward direction carrying the star wheel 1/ with it. The (lctent roller 1) then moves into the following toothspace of the star-wheel. whereby the spring 7.: can contract still more and thus depress the lever arm 2' still further. The stepping pawl 18 is not yet engaged by the tooth of the escapement wheel (3, and the depressed lever arm 2'- by acting upon the pin =-n, keeps this pawl 18 out of the range of the wh el (3 until the detent roller I) has moved into the tooth space of the star-wheel. \Yhen. however. the point of the star-wheel that follows on next in the direction of rotation begins to pass under the detent roller Z). the lever arm engage and retain that tooth of the wheel 6 which lies in. the same radius asthe point of the next following tooth of the controlling star-wheel a. -Thisprocedure will be repeated exactly when the next letter key is struck. so that the operation of the controlling wheel (6 shown in Figs. 1 to 4; will produce between every two-letters or charactersa space equal to the normal spacing of the machine.

In order to produce between every two letters a space equal to two. or more times the normal spacing. it is simply necessary to provide a controlling wheel 0 having a correspondingly smaller number of teeth with wider spaces bet-ween them.

In the illustrative embodiment shown in Fig. 6 t-he controlling member acting upon the detent roller 7) has the form of a straight 'ack, mounted on the paper carriage with pointed teeth whose pitch will produce the desired spacing greater than normal between the letters and which must be exactly seems equal to an entire multiple of the single normal spacing of the machine. Consequently, amachine might be rendered capable of writing with two different spacings if it were provided with two systems of lever mechanisms Z)'v as described, one of which would be arranged to follow a CO]1 trolling member in the form of a'star-wheel on the escapement wheel 6, while the other would follow a straight rack to on the paper carriage. When this spacing mechanismris thrown into gear it can only become imme- (liately operative when the detent roller Z) strikes upon one of the point of the starshaped controlling member-(1.. But as this -ct. ntrolling member is rigidly connected with the escapement wheel 6, when typing a position will frequently obtain, in which the detent roller. enters into a space between two points ot'the controlling wheel a. Consequently, the spacing mechanism cannot at once-become operative in this event. When typcwriting, ordinary spacing will first obtain, and only when the detent roller?) has passed out oi. the space between two points oi the star-shaped controlling member onto the next point will the spacing mechanism operate uniformly. In other words, as a point and a'space of thecontrolling member a in the radii of the teeth of the escapement wheel follow one another alternately, it is clear that the above described spacing mechanism can become operative immediately after it has been thrown into gear only inhalf the possible positions, while, theoretically speaking, in the other half of the possible positions the first two letters written after the spacing mechanism has .been thrown into gear are not spaced, but only separated by the usual space. A further object of my invention is to remedy this defect. In the construction according to Figs. 7 to 16 I attain this end by not connecting the controlling member, c. the star-wheel, rigidly with the escapement wheel, but allowing it a certain independent movement relatively to the escapement wheel which enables it always to be so placed that,

. when the spacing mechanism is thrown into gear, the matter is at once typed spaced. This adjustment otthe cont-rolling member is brought about by the detent roller. This detentroller is here journaled in an auxiliary leverwhich is fulcrumed on a principal lever and is under the action of a spring. The end positions of this auxiliary lever are determined by stops or abntments and its connection with the principal lever and the arrangementof said stops are such that, when the spacing mechanism is thrown out 5 of gear, the auxiliary lever rocks in such manner that, when the spacing mechanism is thrown 1nto gear again, lt-Cilll exercise a pressure on the star-shaped controlling wheel, by which this is brought into the tion when it is on. a point of the controlling rests against the pin 26. In this illustrative ing the movement of the stepping pawl is influenced in such manner. by the principal lever,=f when the spacing mechanism is thrown into gear, that it permits the pawl to swing a greater angle. The vertical rod connecting the above described key-lever mechanism with the principal lever ot the detent roller is also somewhat modified: In this constructional form this rod has an oval hole where it is attached to the prin cipal lever, because when the detent roller runs over the points of the star-shaped controlling member it causes the principal lever toroclc, which motion may not of course influence the position of this rod. It is to be noted, in addition, that in the illustrative embodiment of the invention according to T to 16 the above described constrrction of the mechanism is modified inasmurh as, in consequenceof the change in the arrangement and mounting of the detent roller, the latter is not in its operative posimember, but when it is situated in a space between two points of the same. It is to be understood-that my invention is not limited by one definite position in which thedetent roller becomes operative.

Referring to Figs. 7 to 16, the axle 5 carrice the escapement wheel 6, with which the stepping pawl 18 and the holding pawl 15 engage. The latter pawl is; secured on the carrier12 which also carries'the stepping pawl 18, as in the illustrative embodiment according-to Fig. 1. The pawl carrier 19 also carries the abutment lever 23; this is pivoted on the pin 24 an d'is pulled down ward by the spring 25 sothat its rear arm embodiment of my invention the star-wheel a is loose on the axle 5 of the escapement wheel 6. The escapement wheel and the starwheel are connected by a-pawl a which is mounted on the escapement wheel and engages in a ratchet wheel a rigidly connected with the star-Wheeh The detent roller 72 is here mounted on an auxiliary lever c fulcrumed on the pivot f carried by the principal lever g. The motion of the auxiliary lever c is limited by the lugs 71 on the-aux- .ilia'ry lever c. This lever is also under the 'ing a slot surrounding the free end of the abutment lever 23, sothat, underfcertairrL3 3 one tooth.

circumstances, namely when the principal v will be readily understood from Figs. 10 to 16. In Fig. 10 thespacing mechanism is shown out or" operation. The stop 23 for the stepping pawl is situated in its normal position, and when matter is written while the pawl carrier is in the position here shown the stepping pawl 18 can snap forward only The machine writes with ordinary spacing. In Fig. llthe spacing mecha* nism is shown thrown into gear. The connecting rod 0. has moved upward and. owing to the principal lever g having been rocked by the spring is the detent roller 6 lies against the star-wheel a. The rod 72 has been lifted and has rocked the lever 23 so that the stepping awl 18 can now snap considerably farther torward and allow one or more teethof the escapement wheel to pass it without engaging them. Fig. 12 shows the most unfavorable position of the star-wheel. In this position the typed matter would not be spaced the next time a letter-key wasstruck, but the letters or char? acters would be written the ordinary distance apart because the detent roller 6 is just on a point of the starwheel. The principal lever g and its rod n are so positioned by the roller 5 that they leave the lever 23 uninfluenced. The steppingpawl 18 can allow only one tooth to pass. The star-wheel must be brought from this position, which of course, as mentioned above, frequently occurs in practice, into the-correct position; this is done by the detent roller 6 when the spacing mechanism is thrown into gear. The manner in which the detent'roller op era-tes will be understood from 13 and 14. Fig. 13 shows how the detent roller by runningfdown the inclined face of the tooth of the star-wheel has rotated the latter so .far that the pawl a, coacting with the toothed wheel a connected with the starwheel a, arrives almost at the next tooth of this ratchet wheel. Fig. 14 shows the subsequent position, in which the spacing mechanism is completely thrown into gear and the star-wheel a correctly set. The lever e is now thrown over on the lever g and the detent roller 6 is atits greatest distance from the fulcrum of the lever 9'. Consequently the star-wheel alias rotated so much far-' .the last described illustrative embodiment of my invention. In Fig. 15 the pawl carrier 12 is shown swung out at. right angles to the plane of the drawingand the stepping pawl 18 is pulled by its spring 18 out of the range of the teeth ofthe escapement wheel 6. This wheel is retained in this position by the holding pawl 15. As the lever or stop 23 has been thrown over by theprincipalrlever g by means of the rod n, the stepping pawl 18 has been able to swing a greater distance and the figure showsthat' it has not passed by only one tooth, as is usual when writing with ordinary spacing, but two teeth. In Fig. 16 the holding pawl 15 has released the escapement wheel 6 and this can now rotate. As the detent roller 6 runs on the star-wheel a, it and the principal lever g are forced downward. Consequently, the stop 23 is released the rod n and returns under the influence of its spring 25 into its normal position. It presses against thestepping pawl 18-a11d drives this into the range of the teeth of the escapement wheel, so that the pawl 18 retains a ratchet tooth determined bythe starwheel a. In the meantime the detent roller (2 has arrived almost on one of the points of the star wheel and at the next moment will slide down into. the following spacein orderto prepare for the increased movement of 'the pawl 18, by rocking the stop 23, so that when the next letter key is struck the pawl 18 will move past two teeth in consequence of its stop 23 being thrown over.

I I claim 1. Ina typewriting machine, the combination with an escapement wheel, of a key operated pawl-carrier, a holding pawl rigidlyjmounted on said carrier, a stepping pawl mounted on said carrier for oscillatory and longitudinal movement, means for moving said carrier to cause the'pawls to engage the wheel alternately, means for holding'the movable pawl out of engagement with said wheel, a controlling member, and a detent roller controlled by said controlling member and actuating said means.

2. In a typewriting machine, the combination with a paper carriage, of an escapement wheel, a key-operated pawl-carrier, a

holding pawl rigidly mounted on said carrier, a stepping pawl mounted on said carrier for oscillatory and longitudinal movement, means for .moving said carrier to cause the pawls to engage the wheel alternately, means for holding the movable pawl out of engagement with said wheel, a toothed controlling member operatively connected with the paper carriage, and a detent roller controlled by said' controlling member and actuating said means. I

3. In a typewriting machine, 'the combination with an escapement wheel of a keyoperated pawl-carrier, a holding pawl rigidly mounted on said carrier, a stepping pawl mounted on said carrier for oscillatory and longitudinal movement, means for moving said carrier to cause the pawls to engage the wheel alternately, means for holding the movable pawl out of engagement with said wheel, a revoluble toothed controlling member operatively connected with the escapement wheel, and a detent roller controlled by said controlling member and actuating said means. 7

4. In a typewriting machine, the combination with an escapement wheel of a keyoperated pawl-carrier, a holding pawl rigidly mounted on said carrier, a stepping pawl mounted on saidcarrier for oscillatory and longitudinal movement, means'for moving said carrier to cause the pawls to engage the wheel alternately, a star-wheel operatively connected with the escapement wheel, a detent roller adapted to be controlled by the star-wheel, a pair of spring-pulled counter-levers carrying said detent roller and adapted to move said stepping pawl out of range of the escapement wheel, and. leveractuated means for rocking said levers, causing said detent. roller to be driven by the star-wheel and said stepping pawl to be moved out of range ofthe escapement wheel.

5. In atypewriting machine, the combi nation with an escapement wheel of a keyoperated pawl-carrier, a holding pawl rig idly mounted on said carrier, a stepping pawl mounted on said carrier for oscillatory .and longitudinal movement, means for moving said carrierto cause the pawls to engage the wheel alternately, a star-wheel operatively connected with the escapement wheel, a detent roller adapted to be controlledby the star-wheel, means operatively associated with said detent roller and comprising a single key lever for placing the stepping pawl out of range of the escapement wheel and simultaneously causing the detent roller to co-act with the star-wheel, and an indicating member connected with said means for indicating the relative positions of the stepping pawl andthe escapement wheel.

6. In a typewriting machine, the combi nation with an escapement'whe'el of a keyoperated pawl-carrier, a holding pawl rigidly'monnted on said carrier, a stepping pawl mounted on said carrier for oscillatory and longitudinal movement, meansfor moving said carrier to cause the pawls to engage the wheel alternately, aster-wheel having a rim of ratchet teeth coaxial with, and revoluble independently of, the escapement wheel, a detent pivoted on the escapement wheel andengaging in said ratchet teeth, a detent roller running on the periphery of the star-wheel, and means carrying said ole-- tent roller, for moving said stepping pawl out of range of the escapement wheel.

7. In a typewriting machine, the combination with an escapement wheel of a keyoperated pawl-carrier, a holding pawl rigidly mounted on said carrier, a stepping pawl mounted on said carrier for oscillatory and longitudinal movement, means for moving said carrier to cause the pawls to engage the wheel alternately, a star-wheel operatively connected with the escapement wheel, a spring-pulled main lever, an auxiliary lever rocking between limits on the main lever and carrying a detent roller normally detent roller from the star-wheel and per-- mitting the stop to move toward the stepping pawl, andmeans for reciprocating the connecting-rod.

8. In a typewriting machine, the combination with'an escapement wheel of akeyoperated pawl-carrier, a holding pawl rigidly mounted on said carrier, a stepping pawl mounted on said carrier for oscillatory and longitudinal movement, means for moving said carrier to cause the pawls to engage the wheel alternately, a star-wheel operatively connected with the escapement wheel, 1

a spring-pulled main lever, an auxiliary lever rocking between limits on the main lever and carrying a detent roller normally coacting with the periphery of the star-wheel, a spring-pulled pivoted stop for limiting the rocking movement of said stepping pawl,'a rod attached to the main lever and loosely connected'to said stop for removing the stop farther, from thestep'ping pawl, a

pin secured on said main lever, a connecting rod having an oval slot slidable on said pin and pivotally connected to the main lever for rocking the same against the tension of its spring and thereby removing the detent roller from the star-wheel and permitting the stop to move toward the stepping pawl, and means for reciprocatingth'e connecting-rod.

In testimony whereof, I afiix my sigmature in the presence of two witnesses.

rnron'oa EUGEN BUSCHMANN.

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