US1345093A - Typewriting-machine - Google Patents

Description

A. G. F. KUROWSKI.

TYPEWRITING, MACHINE. APPLICATION FILED NOV. \8, 191a.

Patented J 11110 29, 1920.

2 SHEETSSHEET I.

A. G. F.'KURO.WSKI.

' TYPEWRITlNG MACHINE.

APPLICATION FILED Nov.18. 191s.

Patented J une 29, 1920.

2 SHEETS-SHEET 2 w w I .1? Q 0% R QKNRN ww .wn

city and State of New certain new and useful Improvements in Fig. 2,

* UNITED S TES)" rATEnroFFic ALFRED. G. r. KUROWSKI, o1 BBO'OKYLN, ivnw oiucnssienon 'ro Ummnwoon TYPEWRITER COMPANY, on, nnw YORK, N. Y., a CORPORATION or DELA WARE.

To all'whom it may concern: p

Be it known that I, ALFRED G. F. KURow- SKI, a subject of the Emperor of Germany, but having taken out preliminary United States naturalization papers, residing in Brooklyn borough, in the county of -Kings, York, have invented Typewriting-Machines, of which'the followin is a specification. 1

This invention relates to typewritingmachines, and is herein disclosed as applied to the line-space mechanisinof an Underwood i ty oewriting machine.

he line-spacing operation in typewriting machines is often accompanied with a great deal of noise, and the efi'ort required for the line-spacing operation isconsiderable, both of these facts largely resulting from the employment of a line-space detent, which is needed to hold the platen properly alined during the writing operation. The present invention is directed to eliminating this noise and to reducing the amount of effort required for the operation of turning the platen, especially in line-spacing.

In embodying the invention in an Under-, wood typewriting machine, it has been found advantageous to provide a cam fast to the slide forming part of the usual. line-space mechanism, so that said cam may strike a bell-crank arm provided on the usual linespace detent arm, with the result that the initial movement of the usual slide in linespacingwill carry the detent'clear of the line-space wheel, and thus permit the platen to turn freely. The cam is'advantageously so formed that the detent engages the linespace wheel at the end of the throw of the slide, thus holding the platen all the time when not actually driven.

Other features and'advantages will hereinafter appear. v I

In the accompanying drawings, I 1

Figure 1 is an end viewof part ofthe carriage of an Underwood typewriting ma- 'ng the present invention as apchine, showi plied thereto. Fig. 2 is a plan view Fig.1, parts being broken away;

Fig. 8 is a front view of theparts seen in with some of the parts removed.

Fig. 4 is a view ofpart of Fig.1, with the line-space slide beginning to turn the platen";

of the parts'seen in f 14 and 28" carries the cam 26 along 7 ryrnwarrme-macnmn.

Patented n 29,1920.

Application filed November 18, 1918. S erial No. 262,923.

Fig. 5 is a similar view, showing the slide i at the end of the line-spacemovement.

' Fig. 6 is a similar view,'but with the slide partly returned tonormal position. 7

Fig. 7 is a perspective view of the linespaceldetent arm.

When the usual line-space handle 9 is operatedto turn the platen 10, it'swings about its pivot 11 so that the usual short arm 12 strikes the turned-over end 13 0f the'usual slide 14, carrying said slide rearwardly against thetension of-its spring 15, which is attached to the slide by a pinor post 16. The slide is provided with a pawl 17 Y pivoted thereon at 18 and normally held out of the line-space ratchet wheel 19 by an adjustable shelf 20 on which it rests. Upon actuation of the handle 9, the pawl is carried rear- --ward1y by the slide 14 dropping off the shelf 20into the teeth of the line-space wheel 19,

- which is fast to the platen 10, thereby rotating the wheel one or more line spaces until the pawl is arrested by the usual-oven throw stop 21*which forces the pawl 17 in between the teeth of the wheel 19,- there by preventing overthrow of the platen.

The platen is held against rotation in its position of rest by means of a detent roll22 on-the end ofan arm 23 which is pivoted on the platenframe at 24, and is strongly pressed'against-the wheel 19 by a spring 25.

According to the present invention whenever the line-space lever 9 is actuated, a cam or follower 26, forming the lower end of abell-crank arm 27 "pivoted at 28 on a supplementary slide 28, connected by the pin 16 to move as a unit with the slide 14, is adapted to strike and cam downwardly the short offset arm 29 fast to the detent arm 23, thus carrying the roll 22 clear of the wheel 19, and thus enabling the platen to turn without: operating the detent. In :order to do this most effectively, the cam 26 strikes a. curved cut-out cam face 30 on the arm 29, so that the follower 26, which normally stands just clear of,- or just touching, the arm 29, may start said arm'down with increasing rapidity until it is fully depressed at "a point 31, corresponding to the momentthe pawl 17 begins to turn the platen. Further movement'of the slides a flat portion 32 of the arm 29, thus holding the detent T011 22 clear of the platen until the slide 14 is arrested by having its pawl strike Fig. 6 position, in which it rides idly overv able the piny ltiitormove the necessary a Fig. 1 position. i

the parts. 125 1 the stop 21. At the moment when the slide 14 is arrested, the follower 26 drops into a cut-away portion 83 on the arm 29, thus allowing the detent roll 22 tobe snapped back against the platen by its spring 25.

The typist then releases the line-space lever 9, so that its spring draws back the slides 14 and 28, and the bell-crank 27 rocks to the the smooth portion 32 and finally drops into Inv order to-prevent the bell-crank 27 from yielding upwardly when it strikesthe cam 30, the slide 28 is, provided with a lug 34 overlying thearm 35 of'the bell-crank, and

said arm is held against the lug 84 by a light spring 36, thus normally holding it .in position to actuate the arm .29. Since the throw of the slide 14is uniform, the usual handle 37., for shifting the shelf'20 to vary thethrow of vthe platen by the line-space lever, in no way interferes with the operation-of the cam 26 orthe proper timing of To connect the'slides 14 and 28, the usualpin 16 is utilized, it being threaded or riveted .into both slides. The slide 28 is mounted, on theoutside plate 38 of the shiftframe, and is: adapted to slide thereon because it is provided with slots 39 through which pass shouldered screws 40. To enamount, there is provided a slot 41 in the plate 38, through which the pin .16 passes. The slot 41 may be of precisely the right length for the proper throw of the slide 14. 7

,- It will beobserved that the amount of noise eliminated is considerable, since a great 'deal, if not most, typewriting is done with the lines spaced apart twov or three minimum line spaces, with the result that the line-space detent usually clicks over two or three teeth of the ratchet wheel. 7

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others. Having thus described my invention, I

. claim 1. In a typewriting machine, the combination with a' rotatable platen and a detent therefor, of a ratchet wheel connected to the platen having teeth to cooperate with said detent, a line-space driving device comprising a reciprocating member to turn the platen a single line space so that the detent will engage anothertooth, and connections, whereby the driving operation of said member moves said detent clear of said wheel while the point of any tooth passes the detent.

2. In a typewriting machine, the combination with a rotatable platen. and a detent therefor, of a ratchet wheel connected to the platen having teeth to cooperate with said detent, a line-space driving device com- "prising a reciprocating member to turn the platen a single line space, connections whereby the driving operation of said member moves said detent clear of said wheel, and connections whereby the detent becomes effective at the conclusion of the stroke of platen during ated by said cam to swingthe detent clear of the ratchet teeth while any tooth is passing the detent.

4. In a typewriting machine, the combination with a rotatable platen and a detent therefor, of a ratchet wheelconnected to the platen having teeth to cooperate with said detent, a line-spacedriving device comprising a reciprocating member to turn the platen a single line space so that the detent will engage another tooth, a cam on said reciprocating me'mber,and an arm operated by said cam to swing the detent clear of the ratchet teeth while any tooth is pass ing the detent, said arm having a section clear. of said cam.-at..the end. of its: stroke to permit the detent to become eii'ectiveat the end ofthe stroke.

' 5. In a typewriting machine, the combination with'a rotatableplaten and .a detent therefor, of a ratchet wheel connected to the 'platen having teeth to cooperate with said detent, a line-space driving device com-.

prising a reciprocating member to turn the platen a'single line space so that the detent will engage another tooth, a pivoted arm carrying said detent, a cam extending from said arm, and a second cam on said member normally ineffective but adapted during the driving motion of the member to strike the first cam to carry the detent clear of the ratchet wheel teeth while any tooth is passing the detent.

6. In a typewriting machine, the combination with a rotatable platen and a detent therefor, of a ratchet wheel connected to the platen having teeth to cooperate with said detent, a line-space driving device comprising a reciprocating member to turnthe platen a single line space, ,a pivoted arm carrying said detent, a cam extending from said arm, and a one-way cam on-said member normally ineffective but adapted to de-- press the first cam to carry the detent clear of the ratchet wheel and to be ineffective onthe return stroke of the member.

.7. In a typewriting machine, the combination with a rotatable platen and a -detent therefor, of a ratchet wheel connected to the platen having teeth to cooperate with said detent, a line-space driving device comprising a reciprocating member to turn the platen a single line space, a pivoted arm carrying said detent, a cam extending from said arm, a one-way cam pivoted on said member normally ineffective on the first cam, a lug on said member, and a spring adapted to hold the pivoted cam in position to strike the first cam, said first cam comprising 'a depression to permit the pivoted cam to swing to ineffective position.

8. In a typewriting machine, the combination with a platen and a ratchet wheel connected thereto, of a detent arm for holding the ratchet wheel, a bell-crank arm fast to the detent arm, a reciprocating slide for rotating the platen, and a cam on said slide adapted to depress the bell-crank to swing the detent arm clear of the ratchet wheel.

9. In a typewriting machine, the combination with a rotatable platen and a ratchet wheel connected thereto, of a detent for the ratchet wheel, a bell-crank comprising a cam, a reciprocating slide for turning the platen, and a one-way cam on the slide adapted to depress the bell-crank and to stand clear thereof at the end of its stroke, and to return ineffective on the bell-crank.

10. In a typewriting machine, the combination with a rotatable platen and a ratchet wheel therefor, of a pawl for driving the platen, an overthrow stop adapted to arrest the platen with the pawl in the ratchet wheel, and a detent ineffective during the driving stroke of the pawl and made effective at the end of the stroke to hold the platen when the pawl is free from the overthrow stop.

11. In a typewriting machine, the combination with a rotatable platen and a ratchet wheel therefor, of a pawl for driving the platen, an overthrow stop adapted to arrest the platen with the pawl in the ratchet wheel,

a detent, an arm connected to said detent, a

slide for the pawl, and a cam on the slide .said slide, said arm comprising a second cam on which said one-way vcam 1s effective, said second cam comprislng a depression whereby the slide becomes ineffective at the end of the stroke, so that the detent becomes effective at the end of the stroke and remains effective during the return stroke.

13. In a typewriting machine, the combination with a rotatable platen and a ratchet wheel therefor, of a pawl for driving the platen, an overthrow stop adapted to arrest the platen with the pawl in the ratchet wheel, and a detent ineffective durin the driving stroke of the pawl and made e ective at the end of the stroke to hold the platen when the pawl is free from the overthrow stop and also adapted to remain effective during the return stroke of the pawl.

14;. In a typewriting machine, the combination with a rotatable platen, of a slide for rotating said platen variable distances but having a uniform stroke, a pawl for connecting the slide to the platen, an overthrow stop for arresting the pawl at the end of its stroke, a ratchet wheel for holding the platen, a detent normally resting in said ratchet wheel, and connections whereby said slide makes said detent ineffective during the driving stroke of the pawl and permits .it to become efiective at the end of said stroke and thereafter to remain effective.

' ALFRED G. F. KUROWSKI.

Witnesses:

EDITH B. LIBBEY, CATHERINE A. NEWELL.

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