US1150868A - Type-writing machine. - Google Patents

Description

UNITED STATES PATENT OFFICE. ALFRED Gr. F. KUROWSKI, OFNEW YOVRK, N. Y., ASSIGNOR T6 UNDERWOOI) TYPE- WRITER COMPANY, OF NEW YORK, N. Y., ACORPORATION OFYDELAWARE.

TYPE-WRITING MACHINE.

Speeicaton of Letters Patent. Patented Aug. 24:5 1915.

Application filed March 1, 1912. Serial No. 680,786.

To all w71 om t may concern Be it known that I, ALFRED G. F. KURowsiii, a citizen of the United States, residing in Brooklyn borough, in the county of Kings, city and State of New York, have invented certain new and useful Improvements in Typeriting .Machines of which the following is a speciication.

This invention relates to means for effecting the line-feeding movements ofthe platens of typew'riting machines. The lineiieeding lever and pawl are usually arrested by a stop which is directly engaged by the pawl. In some cases, especially where the operator habitually gives the lever a sharp blow, the pawl is apt to wear and batter the stop. This is objectionable because it will permit excessive throw of the pawl, and in some cases there is liable to be an overthrow of the platen. Moreover injury is likely to be done to the joints and other parts; and sometimes breakages may occur.

Y The object of the present 1nvent1on 1s to overcome these dificulties. ,To this end I provide means for Apreventing the pawl from striking the stop with undue force. In fact I prevent excessive force from being communicated to the pawl by said lever, regardless of the force that is applied to the latter. I place between the handle portion of the. lever and the pawl, a spring, which is in the nature of a driving spring, as it communi- Cates power from the handle to the pawl. Should excessive power be applied to the handle, the spring will yield, and the pawl in any case will not receive more power than the spring can transmit, and hence the force that can be applied to the pawl is limited, so

that wear or battering of the pawl-stop cannot occur, nor can other injury happen either to the pawl or to the parts.

The lever above referred to is provided with a direct stop, which takes the blow of the lever, said stop being so placed that breakage of the lever is not likely to loccur. In use, at the line-spacing operation, the lever is swung against said lever-stop, and the spring yields more or less, but serves to transmit driving power to the pawl and ratchet, so that the platen is turned promptly but without excessive force and without possibility of overthrow;

. In the accompanying drawings, Figure l is a perspective showing my improvement applied to the .line-spacing mechanism of a typewriter. 2 is a top plan View partly in section.. Fig. 3 is a side View of the spring partlyabsorbing the shock at the stroke of the line-space lever. Fig. 5 shows how the spring, in expanding from the Fig.`

catory handle or lever 8. The present imv provements relate to the connection between said handle or lever 8 and said line-spacing pawl 5. Said pawl 5, as heretofore, is pivoted on a slide 6, whereby the pawl is driven to advance the platen until the pawl strikes the usual stop 7. n place of the usual bellcrank comprising both a handle and an arm to engage and`drive the slide 6, there is employed a novel, yielding, driving connection between the lever or handle 8 and said slide G, to permit the handle 8 to make its stroke in advance of theV completion of the stroke of the slide 6, and hence in advance of the completion of the rotation or feeding of the platen. This yielding connection comprises line-spacing mechanism. Fig. 4 shows the f so i sov y a short lever or arm 10, which may be pivoted on the same stud 9 that carries the lever or handle 8; and a platen-driving spring 11 may be interposed between the lever 8 and the arm l0. It will be noted that said arm 10 extends about at right angles to the lever 8, so that the effect of 8 and 1,0 combined is to a certain extent the same as it would be if these parts were made in Vone piece, that is, a stroke upon the handle 8 in a direction longitudinal of the carriage is transformed into a rearward lthrust to drive the slide 6 rearwardly or at right angles to the carriage; but, owing to the fact that 10 is movable independently of 8, and also to the fact that the platen-driving spring 1l is placed between 8 and l0, the lever 8 is permitted to complete its stroke longitudinally of the carriage in advance of the completion of the stroke of the arm 10 transversely of the carriage. The mounting ofy the relativelyy yieldable parts 8 and l0 on a singlepivot normally keep the "stop 7 with -ing improvement to existing machines without change in the machines, besides securing other advantages. Thus the line-spacing mechani ai, which may be of usual character to include the ratchet wheel 4 and pawl- 5 carried by slide 6, is caused to perform its function of rotating the platen through the medium of the lever device aforesaid, which constitutes the operating device.

The stroke of the lever 8 is limited .by the abutments or stops12, 13. The spring 11 occupies a pocket 14 in the lever 10, and may abutting faces of the levers separated. When the lever 8 is struck sharply, the spring ll is compressed, or, in other words, if the lever 8 is undue amount of force,l the spring 11 will absorb it. or act as a bumper, lFig. 4; and after the lever 8 reaches the stop 13, the spring will expand and complete the spacing, Fig. 5, forcing the pawl 5 against the a limited tension or force, so that the blow of the operators hand is not spent on the stop 7.

The carriage herein shown is substantially the usual Underwood typewriter carriage, in which the manually operable lever 8 is arranged to strike the stop 13, and re.- turn the carriage when the operator desires to begin a new line. The stop 7 for the line space pawl is arranged to arrest said pawl when the lever 10 is at the limit of its throw, and in the present disclosure stops 7 and 13 are so arranged that the spring 11 will not be completely compressed .when the mechanism is arrested by both of said stops, so the levers 8 and 10 will not be in contact with each other. The usual spring detent 15 working on the ratchet 4 coperates with the stop 7 in properly regulating the line spacing. The stop 7 in arresting the pawl with the lineo locks it into engagen'ient thus prevents space ratchet wheel 4, and overthrow of the platen.

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. The combination with a line-space wheel and a platen, of a pawl for driving the line-spaee wheel, aline-Space device including a manually operable lever, a yielding connection between the lever pa wl, and a stop for the lever whereby when the lever is quickly operated, it may exceed the speed of the driving pawl and may be arrested by said stop before the yielding connection completesthe operation of the pawl.

2. '.ll'a` combination with a line-space wheel and a platen, of a pawl for driving the line-spaee wheel, a line-space device including a manually operable lever, a yieldconnection between the-lever and the device including struck with an l the driving pawl, and

and the alining detent for said platen, and a stop for the lever whereby when the lever is quickly operated, it may exceed the speed of the driving pawl and may be arrested by said stop before the yielding connection `completes the operation of the pawl.

' 3. The combination with a line-space wheel and a platen, of a pawl for driving the line-space wheel, a slide or carrier on which said pawl is mounted, a line-space a manually operable lever, a stop to limit the driving stroke of said lever, and a spring connection between said lever and said slide or cai-'ier through which driving pow er is transmitted in the same direction from the lever to said slide.

In a typewriter, the combination with a line-spacing mechanism, of a manually operable device for actuating said mechanism, and a platen-rotating spring between said device and the mechanism for limiting during the initial movement cf said device the power which is transmitted in direct action to said mechanism in that initial move-v ment.

5. In a vtypewriting machine, the combination with a rotatable platen, of a lever, a pawl and ratchet for driving the platen, and a platen-driving spring intermediate said pawl and lever, through which spring power applied to the lever is transmitted to rotate the platen.

6. In a typewriting machine, the combination with a rotatable platen, of a ratchet connected thereto, a lever, a stop for arresting said lever, a pawl to engage said ratchet for driving said platen, a stop for arresting said pawl, and a spring between the lever and pawl arranged to absorb power applied suddenly to the said lever and complete the throw of said pawl in the same direction after said lever is arrested.

7. In a typewriting machine, the combination with a rotatable platen, of a ratchet wheel connected therewith, a pawl for rotating said ratchet wheel, a lever for operating said pawl, a stop for arresting said lever, a spring interposed between said lever and said pawl, to move said pawl in the direction of movement of said lever, a stop for said a` spring detent alining said platen.

S. In a line-spacing mechanism, the cornbination with a rotatable platen, of a ratchet, a pawl for moving said ratchet to turn the platen, a manual device operable in one direction to drive said pawl, and a platen-driving spring placed under `tension by the said operation of the manual device and operating in the same "direction to drive said pawl and thereby turn the platen.

bination with 'a rotatable platen thereon, of a pawl for moving said ratchet,

a compression spring to move the pawl and drive the platen, and a line-spacing lever for compressing said spring in its throw, said spring adapted to exert pressure in the saine direction to complete the turning of said platen.

10. In a typewriting machine, the combination with a platen and a line-space lever movable in one direction to` drive the platen, of drivingr mechanism including' a platendriving spring between the line-space lever and the platen, said spring exerting its tension in the same direction, to directly transmit the movement of said lever to the platen, and stops for arresting said lever and platen.

11. In a typewritingvmachine, the combination with a platen, of a line-space lever, driving mechanism between the platen and 'said lever including a platen-driving spring tensioned by the driving stroke of said lever, said spring being operative in the same direction as said lever, to directly transmit the movement of said lever to the platen, a spring for returning said driving mechanism, and a spring detent for alining said platen.

12. The combination with a line-space wheel and a platen, of a pawl for driving the line-space wheel, a lever, an elastic connection between the lever and the pavvl to receive driving power from said lever and to transmit that power to the pawl and thereby drive the platen, an alining detent for said platen, and a stop for the lever. v

13. The combination with a line-space wheel and a platen, of a pawl for driving the line-space wheel, a stop for arresting said pawl, a movable carrier for said pawl, a line-space device including a. manually operable lever and an arm actuated thereby and actuating said pawl carrier, a spring operated by said manually operable lever and forming a driving connection between said lever and arm operating in the same direction as said lever, and a stop for limiting the driving stroke of the manually operable lever.

14. In a, typewriter, the combination of a line-spacing pawl and ratchet, an operating device capable of sharply thrown movement, and yielding means between said operating device and said line-spacing pawl to convert sharply thrown movement of said device into moderately acting power movement to actuate said line-spacing pavvl l5.' In a typewriting machine, the combination with a manually operable lever and an arm actuated thereby, of a rotatable platen, a spring detent for lsaid platen, a

line-space pawl and ratchet wheel, said arm moving said pawl, and a spring between said lever and arm, to act as a cushion, said spring being of sufficient strength to turn said platen against the resistance of said detent.

1 6. The combination with a line-space wheel and a platen, of a `pavvl for driving the line-space wheel, a stop for arresting said pawl, a movable oa'rrier for said pawl, a manually operable lever,l an arm actuated thereby for actuating sain pawl carrier, a spring interposed between said lever and arm and adapted when compressed to operate the pawl, and a stop for limiting the driving stroke of the lever, said lever and arm being concentrically pivoted, and the lever being movable independently of said arm.

17. In a typewritingmachine, the combination with a rotatable platen, of a ratchet wheel connected therewith, a pawl for rotating said ratchet wheel, a device for operating said pawl, including a manually operable lever and an arm actuated thereby, and a spring interposed between said lever and arm to drive the platen.

18. The combination with a shiftable platen frame, of a carriage in which said platen frame is mounted, a manually operable lever. on said carriage and an arm actuated thereby, a yielding platen-driving connection between said lever and arm, and a line-spacing mechanism mounted upon said shiftable frame to be operated by said platen-driving connection and said arm in either of the shift positions of said platen frame. Y

19. The combination with a shiftable platen frame, of a carriage in which said platen frame is mounted, a manually operable lever on said 'carriage and an arm actuated thereby, a yielding connection between said lever and arm, and a line-spacing mechanism mounted upon said shiftable frame to be actuated by said arm in either of the shift positions of said platen frame, said lever and arm being mounted concentrically,

20. In a typewriter, the combination of a carriage, a platen thereon, a pawl and ratchet for rotating the platen, a manually operable lever to return said carriage after a line of Writing, la platen-driving spring between said lever and said pawl, and a stop to limit the initial stroke of said lever relatively to said carriage. l

:21. In a typewriter, the combination of a pawl and ratchet for rotating a platen carried on a carriage, a manually operable lever therefor pivoted on said carriage, said lever also serving to return said carriage after a line of writing, and a platen-driving spring arranged on said carriage to communicate the movement of the lever to the pawl.

22. In atypewriter, the combination of a platen, a line-spacing mechanism including a line-space Wheel and a driving pawl therefor, a manually-driven device, and a spring connection between said line-spacingmech- A applied through said manually-driven device to actuate said line-spacing mechanism; said manually-driven device being connected to drive said platen on its initial stroke.'

23. In a typewriter, the combination with a platen and a line-spacing mechanism com, prising a ratchet Wheel and a pawl to rotate said Wheel, said pawl having a limited movement prior toits engagement With the Wheel,

of a manually operable operating device for said mechanism, said operating device effective upon its initial stroke to line-space the platen, and means bet device and paWl for limiting the force With which the pavvl is brought into engagement with the ratchet Wheel.

Ween said operating ALFRED G. F. KUROWSKI.

Witnesses:

B. GOLDBERG, L. L. PRITzL.

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