US1530907A - Typewriting machine - Google Patents

Description

March 24, 1925. 1,530,907A

c. E. NoRlN l TYPEWRITING MACHINE Filed Jan. 16, 1923 @yf f M/ 6" A fm/Q47 CARL E. NOR-IN, OF JERSEY CITY, NEW JERSEY, ASSIGNOR TO UNDERWOOD TYPE- WRITER COMPANY, F NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITNG BIAGI-EINE.

Application filed January 16, 1923. Serial No. 612,902.

To all whom it may conce-m.'

Be it lrnown that l, CARL E. NonrN, a citizen of the United States, residing in Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a specification.

The present invention relates to linespacing mechanism for typewriting machines. More particularly, the invention relates to means for deadening the noise of the line-spacing mechanism.

The object of the invention is the provision of means for cushioning the blows of the lineespace lever on the stops which are ordinarily provided for determining the throw thereof, both in the hand movement of the lever to line-feed the platen and in the return movement of the lever by the spring which is usually provided for that purpose; although the invention is applicable for cushioning the blow of the lever on movement thereof in either direction only, and in cushioning the shock of arresting the lever when the same is returned by means other than the return spring referred to.

ln the preferred embodiment of the invention, the same comprises a bifurcated leafspring set upon the lever arm and having shoulders, one at each side thereof, for engagement with the stops which determine the throw of the lever.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a top plan view of one end of the platen and platen carriage with the linespacing mechanism thereon.

Figure 2 is a detail view in side elevation, partly cross-sectional, taken on the line 2-2 of Figure 1.

Figure 3 is a detail view in front elevation of the lever and stop devices.

The platen is carried by an axle 11 revolubly mounted in the side plates 12 of the carriage 13; one side of the carriage only being shown. The usual paper-guide or table 111 is shown on the carriage behind the platen, and at the front of the platen the side plates thereof are connected by a rail 15.

Fast to the platen axle is a ratchet-wheel 16, the teeth of which are adapted to be engaged, for rotation of the ratchetewheel and platen, by the tooth 17 of a pawl 18 pivoted at 19, above the ratchet-wheel, on a slide 20. The slide 2O las rectilinear movement rearward on the lside plate 12 to cause the pawl to rotate the ratchet-wheel. A spring 21, connected at 22 to the rear end of the slide and having a connection (not shown) at its other end to the side plate 12, serves to return the slide to its forward normal position, and to hold the slide in such position against accidental displacement.

Pivotally mounted on a screw or pin 23, set vertically into an ear 24 on the carriage side piece 25, is a bell-crank lever. One arm 26 of the bell-crank lever is in engagement with an ear 27 on the forward end of the slide. The other arm 28 of the bell-crank projects forward across the front rail 15 and terminates in a linger-piece 29 for throwing the lever to operate the line-space mechanism.

On the rail 15, on each side of the lever arm 28, is a stop 30 for determining the throw of the lever. The right-hand stop determines the hand throw of the lever against the action of the spring 21 to linefeed the platen, and the left-hand stop determines the throw of the lever to normal position by the spring 21. Preferably a guard 31 is set over the lever on the stops 30, and is secured thereto by screws 82.

Secured by screws 83, against angular movement, to the under face of the lever arm 28, is a leaf-spring Se. This leaf-spring extends longitudinally forward on the lever arm 28, and its forward end is free. The

spring has a slot 85 extending from its free end some distance toward its other end and is thus bifurcated to have two prongs 36. Except at its eXtreme forward end, the spring and the prongs thereof preferably lie within the side lines of the lever arm 28. At its forward end, however, each prong 36 has a shoulder or lateral offset 37 which projects beyond the side of the lever arm and which is in alignment with the corresponding stop 30. |These shoulders 37 by engagement with the stops arrest the lever. The

prongs 36 being resilient, and the slot 35 being present, the prongs yield when the shoulders 37 strike the stops, and a cushion is thus provided which deadens or prevents noise in arresting the lever.

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:

l. In a typewriting machine, a platen, line-spacing mechanism for the platen, a lever for operating the line-spacing mechanism, a stop to determine the throw of the lever, and alea-spring set lengthwise on the lever arm and having a shoulder thereon projecting beyond the edge of the lever for engagement with the stop to prevent noise in stopping the lever.

2. In a typewriting machine, a platen, line-spacing mechanism for the platen, a pivotally mounted lever, a stop at each side of the lever for determining the throw of the lever, and a bifurcated spring laid lengthwise of the lever and having a shoulder projecting therefrom on each side of the CARL E. NORIN.

`Wtnesses:

JENNIE P. THORNE, EDITH B. LIBBEY.

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