US1705927A - Typewriting machine - Google Patents

Description

Mitch 19, 1929, unows 1,705,927

TYPEWRITING MACHINE Filed Sept. 2, 1927 Affor e Patented Mar. 19, 1929.

"UNITED STATES PATENT OFFICE.

ALFRED Gr. F. KUROWSKI, OI BROOKLYN, NEW YORK, ASSIGNOR TO UNDEBWOOD 'ELLIOTT FISHER COMPANY, OF NEW YORK, Y., A CORPORATION OF DELAWARE.

' 'r rnwnrrrne MACHINE.

Application filed September 2, 1927. Serial No. 217,087. i

This invention relates to devices. for ro tating the platen of a typewriting machine to feed work-pieces quickly agreat distance to a predetermined point by a single opera.-

tion. It may be used in condensed billing work. It may also be advantageously employed with a work-piece holder of the kind disclosed in the patent to Joseph Lindbur-g, No. 1,600,235, dated September 21,1926.

1 It is a feature in thepresent invention to provide a simple, inexpensive platen-rota} tor arranged to be readily disconnected from the platen when no longer needed so as to leave the latter in condition to be rotated 1 by the usual line-spacing mechanism, g

In carrying out my invention, a toothed wheel is fastened on the platen-shaft and a' longitudinally-slotted radial crank-arm is looselymounted on'the shaft adjacent the surface of the wheel next to the platen. A handle-carrying bar is slidably fastened to said crank-arm for'movement in a radial direction. A bolt or pawl is disposed against the face of said. crank-arm next .to

ative engagement with the platen-shaft which spring is also effective for holding said bolt in an ineffective position, so that the usual line-spacing mechanismfmay rotate the shaft without affecting therotator.

Other features and advantageswillliereinafter appear. I l

lower part ofthe crank-arm is formed with In the accompanying drawings, Figure 1 is a side view of the platenframe of an Underwood typewriting machine with the platen-rotating device mounted. upon the platen-shaft, the platen-knob being broken away to disclose the underlye ing parts, one extreme crank position being indicated indot-and-dash lines. The crank is in operative engagement and abutting its rearward stop;

Figure 2 isa sectional elevation, showing the driving crank engaged and locked to the platen. .T

Figure 3 is a side View of the platen-rotaking device, showing the crank-handle as said wheel for engaging between the teeth being pulled out of engagement while the leaf-spring is lifted for unlocking the same.

Figure 4- is a perspective view,"showing the right-hand end. of the platen with the platen-rotat0r mounted upon the platenshaft," a card-holder being mounted upon usual platen-frame and a usual platen-knob:

14, the latter shown to be fixed upon the right-hand end of said shaft by means of a 'co the platen and thecrank being thrown rearwardlyto position the platen and thecard-.

pinJ15. A front-striking type-bar is" indicated in Figure 1.. The platen-rotating device includes a toothed wheel 16 which, by means of its hub 17 extending at either side of the wheel and pin 18, is fixed upon the shaft. Loosely fitted upon said hub. and stationary relatively to the platen-frame, while fixed thereto by means of an adjusting device 19, to be described. hereinafter, is a thick disk 20 carrying a rear stop 21 and a forward stop 22 to limitthe throw of a crank,.generally designatedby the numeral 23. 'The crank'includes an arm 24 rotatably mounted upon said hub 17, and confined between said toothed wheel 16 and said disk. 20, a boss or collar 25 is fixed upon the shaft by a pin 26 and set against said hub 17*to prevent axial dislocation of the parts mounted thereon. Extending along the inner side of said crank-arm 24 and slidably mounted thereon is a bar 27, the'upper end'of which is provided with a longitudinal slot 28' engaging around a screw 29 threaded into the upper end of said crank-arm, while the a longitudinal slot 30 to receive, passing therethrough, a transversely-bent lug 30 which is fastened to the lower end of the crank-arm 24 and is integrally joined to'a bolt or pawl 31 whose lower end is formed with a tooth 32 to engage between the teeth of said toothed wheel. The sliding bar, at its upper end, carries a finger-piece or crankhandle 33 which may be readily depressed to bring the tooth into engagement with thc wheel, thus operatively connecting the latter with the crank for rotating the platen. A leaf-spring 34 is fastened upon the crankarm by means of screws 35 opposite the slid ing bar 27, and is formed with a heel 36 so as to catch behind the back of the bolt 31 when the same is pressed into engagement with the wheel 16, thus locking the crank 23 in engagement with the wheel. The spring, at itsfree end, is formed with an outward bend 37 to serve as a finger-piece when unlocking the crank.

Figure 3 illustrates the manipulations necessary when disengaging the crank 23 from control of the locking spring 34, whereby one hand pulls the free end of the spring in a sidewise, outward direction, as indicated by the arrow 37, to remove the heel 36 from behind the bolt 31, while the other hand grasps the crank-handle 33 to pull the same outwardly to disengage the tooth from the toothed wheel.

A laterally-disposed screw 36 is fastened in the bolt 31 adjacent the opposite end .thereof from the lug 30 and engages in a longitudinal slot 37 in the spring 34 adjacent the free end thereof. The screw 36 has a head 36 whose diameter is greater than the width of the slot 37 which head is positioned so as to abut against and stop the spring 34 when the heel some been pulled clear of the bolt 31. The positions of the screw 36 and the lug 3O on the bolt 31 relative to each other, and the ar angement for both of these elements to move in slots which are fixed relative to each other, serve to hold the bolt securely against being turned transversely to the crank-arm 24, when the latter is swung for rotating the platen.

The spring 34 is formed with a convexlycurved portion 34 adjacent the heel 36, which permits the latter to bear positively on the bolt 31 when it is moved to its ineffective position, as illustrated in Figure 3. This arrangement permits the spring 34 to frictionally hold the bolt 31 securely in its inoperative position while permitting it to be quickly moved therefrom to its effective position by a light inward pressure on the handle 33.

Figure 4 illustrates more plainly the function of the crank in operating the platen for attaching, detaching and positioning a workpiece. The crank is engaged, as described above, and thrown against its rear stop, as indicated. in Figure 1, so that a cardholder 38, mounted upon the platen, is turned up and rendered accessible for inserting or removing a card or work-piece 39. Referring to the above-cited patent, the card-holder includes a card-holding bar 40 extending along the platen and curved to fit the surface thereof. The bar at its upper edge has an undercut 4ladapted to receive and hold the card 39 upon the platen. The bar is fastened at each end to slotted side arms 42 which loosely engage over hubs 43 mounted onthe platen-shaft. A latch 44 is pivoted at 45 upon each side arm and has a hook 46 to embrace said hub 43 to securely attach the one inserted, and the holding bar restored to effective position, the crank may be thrown rearwardly to bring the card down to position it for writing the first line. The throw of the lever may be varied by adjusting the forward stop-pin 22 in various holes 52 arranged in a circle in said disk 20. The disk, in turn, is rotatably adjustable relatively to the platen-carriage bymeans of the abovementioned adjusting device 19. This device may be a usual turnbuckle connection between said disk and the adjacent side plate of the platen-frame. A part 53 of said connection is screwed at 54 to the disk, another part 55 being opposedly screwed to the platen-frame, .and both parts 53 and 55 threaded into a turnbuckle 56, which is screwed inadjusted position by a lock-nut 57, so that the forward throw of the crank, indicated in dot and dash (see Figure 1), is stopped when the usual detent devices, as indicated in dotted lines at 60 and 61 (Figure 1), happen to be in full engagement. In other words, the first writing line is properly positioned without necessitating any additional adjustment. then be written line by line in the ordinary manner. 3

When the machine is to be used for ordi nary workagain, the crank will be disengaged and retained in ineffective position in the manner described above.

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: I

1..A rotator fora typewriting machine platenhaving a platen-shaft, including a toothed wheel fast on said shaft, a crankarm loosely mounted on said shaft, stops for limiting the angular movement of said arm in each direction, a bolt fastened to said crank-arm at one side thereof for angular movement therewith and for sliding movement in an axial direction relative to said wheel, whereby the inner end of said bolt may engage between the teeth of said Wheel to operatively connect the same with said crank-arm, and means for latching said bolt in positive engagement between'the teeth of said wheel, including a leaf-spring fastened to said crank-arm and extending inwardly The card may to lie against said bolt, said spring havinga heel-element for engaging behlnd the outer end of said bolt when its inner end 1S engaged between the teeth of said wheel, said spring being mountedfor swinging said heel laterally to remove the latter from behind said bolt for releasing the same.

2. In a platen-rotator for a typewriting machine having a platen and a platen-shaft,

a toothed wheel fast on said shaft, a-longitudinally-slotted crank-arm loosely mounted on said shaft, a bolt disposed against said arm and having a transverse integral lug slidable in the slot in said arm, a longitudinally-slotted leaf-s ring fastened on the outer end of said arm and extending inwardly along the same to bear against said bolt, a pin in said bolt engaging in the slot in said spring, said spring being positioned on said bolt adjacent the opposite end from said lug to co-operate with the latter in preventing the bolt being turned transversely to saidradial directioma leaf-spring fastened to crank-arm by angular movement of the latter when rotating the platen, and means including'a heel-element formed in said spring for engaging behind said bolt to prevent it from moving in a radial direction out of engagement with said toothed wheel.

3. In a rotator for a typewriting machine platen, the combination with a platen-shaft, a toothed wheel on said shaft, a crank-arm loosely mounted on said shaft for angular movement therearound, and a bolt fastened to said crank-arm for angular movement therewith and for radial movement relative to said wheel for engaging between the teeth thereof, of a leaf-spring fastened to the out.- er end of said crank-arm and extending inwardly therealong, said spring having a Z- shaped bend forming a heel-element effective for engaging behind the outer end of said bolt upon movement ofthe latter into engagement with said wheel, the inner end of said spring being bent laterallyto form a finger-piece for moving said spring laterally toremove said heel from behind said bolt to permit the latter to be moved outwardly to ineffective position, said spring having a convex bend disposed outwardly of said heel and effective to permit the latter to bearpositively against the side of said bolt when it is in its ineffective position,

therebyiholding said bolt securely in'said last-named position. a

l. In a typewriting machine, the combination of a platen havingla platen-shaft, a toothed wheel on said platen-shafna radial cranlnarm loosely mounted on said shaft against the surface of said wheel next to said platen, a handle-member disposed along the inner surface of said arm and slidable in a radial direction toward and away from said wheel, a radially-movable bolt disposed for upper end of said radial arm and extending along the latter toward sald wheel, said leafspring having a shoulder intermediate itsends for engaging behind the outer end of said bolt to latch the same in effectlve engagement with saidwheel, the lower end of said leaf-spring 'bein turned outwardly to form a finger-piece for 'dlsengaging said shoulder from behind said bolt to permit the latter to be moved out of engagement with said toothed wheel.

5. In a device of the class described, a revoluble platen having a platen-shaft, a toothed wheel on said shaft, a radially-disposed crank-arm loosely mountedlon said shaft and having a longitudinal slot adjacent said wheel, a handle-carrying-bar slidably fastened against the face of said crankarm next to said platen for movement ina said arm adjacent the outer end thereof against the opposite face from said bar, said spring having a'lengthwise slot adjacent its inner end, a bolt movable in a radial direction with respect to said wheel between said spring and said'arm and having its inner end shaped for engaging between the teeth of said toothed wheel, and instrumentalities for securely fastening said bolt to said crank-arm for angular movement therewith, including a transverse lug on the outer end of the bolt arranged for slidably engaging in the. slot in said crank-arm and extending therethrough to be connected to said slidable bar, and a screw in said bolt adjacent the inner end of said lug engaging inrthe slot insaid leaf-spring, a fiat portion of said spring being effective to press against said bolt in operative position of the latter and hold said slot engaged around the inne portion of said screw. 6. In a device of the class described, a revoluble pla-ten having a platen-shaft, a

toothed wheel on saidshaft, a crank-arm siliency of the spring to snap behind the outer end of said bolt when the latter is moved into engagement between the teeth of said wheel.

ALFRED G. F. KUROWSKI.

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