US984934A - Tabulating mechanism for type-writing machines. - Google Patents

Description

T. L. KNAPP. TABULATING MECHANISM FOR TYPE WRITING MACHINES.

APPLICATION FILED JULY 20, 1910.

Patented Feb. 21; 1911.

2 SHBETS-SHEET 2.

TED STATES. PATENT- orrron.

THERON L. KNAPI, OF WOODS'IOCK, ILLINOIS ASSIGNOR TO THE OLIVER TYPEWRITER OF CHICAGO, ILLINOIS, CORPORATION ILLINOIS.

J QTA UL LH G EQH NIs a roe 'r Y rE-wmrmsr MACHINES.

Specification of Letters Patent. J leat ht df b, 21, 1911,

Application filed July 20, 1910; Serial No. 572,816

To all whom it may concerm- Be it known that I THERON LrKnarr, 'cltlzen of the United States, and a resident of Woodstock, in the county of McHenry and State of Illinois, have invented certain new and useful Improvementsin Tabulating Mechanism for Type-Vriting Ma'- I chines; and Ido hereby declare that the fol- 1 lowin'gis a full, clear, and exact descriptionthereof, reference being had to. the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

' This invention relates to improvement in tabulati ng or column-stop mechanism for "jtypewriting machines by' means of which the carriage is-released from the control of '20 F or points where its movement is arrested the usual letter-spacing mechanism to permit of its movement under the force of its actuatingspring to a predetermined point for the purpose of printing items or numhers in one or more vertical. columns.

I The invention relates particularly to an improved form. of brake mechamsm for checking the rotary'motion of the escape wheel when the gear pinion on the escape shaft is released from the carriage rack-bar by the tabulator key, so that upon the reengagement of'said pinion with said rackbar, upon the release of the tabulator key, the parts 'of the letter-spacing mechanism will be in the same relative position as theywereiibefore their release from the carriage.

The invention is an improvement upon a device of this character shown in Letters Patent of the United States No. 959,061, granted May 24th, 1910, to T. L. Knapp 1 and C. C. Harting.

The invention consists of the matters hereinafter described and more particularly pointed out in the appended claims.

In illustrating and describing the invention I have shown it applied to .a typewriting machine of the kind known as an Oliver, but it will be apparent that it may, with equal readiness, be appliedto other machines. 4

' I have 'shownthe same general construction of the shift frame and the key actuating stop controlling the tabulating mechanism as that shown in the patent above referred to, that. is to say, No. 959,061.

As shown in the drawings :Figure 1 is Y a vertical section of the shift-frame and Fig. 4 is a partial vertical section similar to that shown in Fig.1 with the tabulating key and brake-mechanism for the escape- ,wheel shown in that position which they occupy when the tabulating key is depressed. Fig. 5 is a perspective view of the brake for the escape wheel. Fig. 6 is a par tial horizontal section through Fig. 1 on the line 6-6 thereof. 1

1 represents the shift frame; 2, the papercarriage comprising the end plates 3, and front and rear 'bars 4, 5; 6, the platen; and 7, 8 the front and rear guide-bars supported by the shift-frame upon which the carriage rides.

9 is the rack on front of the bar 4 engaged by a pinion 10 operated by the escape gear 11. which provides for the usual letterspacing.

-12 is the key-actuated stop constructed to move upwardly to engage the stop member 13, said stop being limited in its upward movement by means of a block 14 secured to a bracket 15'attached to the shift-frame 1. The lever 16, atthe end of which the stop 12 is formed, is pivoted on a pin 16 projecting from the bracket 15. The stop 12 is actuated by a key 17 atthe end of a lever 17* which is also pivoted on the pin 16. The lever 17 is provided with an upright arm 18 which, through a link 19, disengages the pinion 10 from the rack- 9 when the stop 12 is raised into its operative position. These parts operate as described in the patent referred to above and require no further description here.

20 is a brake arm attached to and depending from the key lever 17. It is provided at its'lower end with a curved brake-member or shoe 21 adapted for contact with the ends of the peripheral teeth on the escape wheel 11 when the key lever is depressed. Said arm has an extension 22 at its upper end which is offset from the main body of the arm and is provided with spaced, up-

right lugs 22, 22 Said brake arm is pivotally connected to the key-lever 17 bya screw 23 which engages an aperture in said extension.

24 is a spring which bears atits lower end against the shoe and at its upper end is coiled about the screw 23 and then connected to a stud 95 made rigid with the key leverl'f Said stud is located between the upright lugs 22 and isn'ormally engaged by the rear lug 22 held'a ainst it by the action of the lower end the spring 24 which tends to rotate the arm 20 rear- .wardly. The shoe 21 is provided with a notched extension 21 to receive and hold the lower end of the spring 24.

I lease the pinion from its associated rack in the operation of the tabulating mechanism, the brake shoe 21 is cause to yieldingly engage the peripheral teeth of the escape-wheel ll -and holds said escape wheel and withit the pinion 10' from turning during the time that said gear pinion is released from the carriage rack-bar, so that upon the rengagement of sald p1n1on wlth trolling'the movement of the carriage em bracing a shaft provided with a gear pinion, adapted .to be engaged with and disengaged from said rack-bar, and with an escape-wheel, column-stop mechanism for releasing said carriage from the letter-spacing mechanism and arresting itsmo'vement V hen the'key lever 17 is depressed to re- 7 at a predetermined point embracing a keylever for operating sa d column-stop mechanism, a brake-arm pivotally connected to,

said key-lever and provided with a shoe adapted to engage the peripheral teeth of said escape wheel, said brake-arm having limited movement toward the escape-wheel, and a spring adapted to hold said brakeshoe yield-ingly engaged with said escape wheel when said key-lever is depressed.

2. In a typewriting machine, in combination with an escape wheel, and column-stop mechanism including an operating key, a brake adapted to engage the escape wheel when said key-lever is operated, embracing a-brake arm provided with an extension offset from said arm, a screw or bolt pivotally connecting said extension to said key-lever, engaging parts on said key-lever.and said brake-arm extension adapted to limit the movement of said brake-arm toward said escape wheel, a shoe carried at the lower end of said arm, and a spring having engagement at its lower end against said brake and its 'upper end beingcoiled about said pivotal bolt or screw and engaged with a rigid part of said key-lever.

In testimony that I claim. the foregoing as my invention I afiix my signature in the presence of two witnesses, this 13th day of July A. D. 1910.

THERONVL. KNAPP.

Witnesses:

EUGENE It. HoY, B. O. YOUNG.

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