US1482512A - Carriage-brake mechanism for typewriting machines - Google Patents

Description

Feb, 5 1924.

H. A. FOOTHORAP CARRIAGE BRAKE MECHANISM FOR TYPEWRITING MACHINES Filed Dec. 51, 1920 2 Sheets-Sheet 1 ||||||||||ll|||l.

@1101 in e 1 Feh. 5 1924. 1,482,512 H. A. FOOTHORAP CARRIAGE BRAKE MECHANISM FOR TYPEWRITING MACHINES Filed Dec. 51, 1920 2 Sheets-Sheet 2 Patented Felt. 5, lid/2d.

STES

Ldtlhtllt ATENT @FHQB.

HARRY ARTHUR FOUEHORAP, E HARRISBURG, PENNSYLVANIA, ASSIGNOR TU mirrors-Henna GOMPANY, A CORPORATION 01E DEEAWARE.

CARRIAGE-BRAKE MECHANISM FOR, TYPEWRI'EING MACHINES.

Application filed December 81, 1920. Serial No. 434,251.

To all whom it may concern:

Be it known. that HARRY A. Foo'rnonar, a citizen of the United States residing at Harrisbur in the county. of lllauphin and State ofennsylvania, has invented certain newv and -useful Improvements in Carriage-Brake Mechanism for Typewriting Machines, of which the followin is a specification, reference being had t erem to the accompanying drawing.

This invention relates to carriage brake mechanism for typewriting machines.

The object of the invention is to provide such a machine, and more particularly one of the fiat platen type with a carriage brake which will be efiective to retard the carriage suficiently to prevent undue shock when arrested by a tabulator stop.

To the accomplishment of the above object and others of subordinate character, the referred embodiment of the invention resi es in the construction and arrangement of parts to be hereinafter. described, illustrated in the accompanyin drawings, and defined in the appended c aims.

In said drawings:

Figure 1 is a rear elevation, artly in section, of a machine of the wel hown Elliott-Fisher type with my carriage brake ap lied thereto.

igure 2 is a sectional view of a ortion of the machine with the brake inec anism applied thereto, and viewed in a direction at right angles to the illustration in Figure ll.

' Figure 3 is a sectional view of the brake pro er.

igure 4 is a side elevation of the brake with the brake spring removed and a portion of the disk broken away.

Figure 5 is a detailed view showing the upper end of the brake standard and the parts associated therewith.

1' indicates the carriage of an Elliott- Fisher machine which, as is well understood in the art, supports the printing mechanism, not shown, and is mounted to travel in the direction of letter spacing on a line s ace frame 2 which in turn travels longitu inally of a fiat platen to efieet line spacing.

These machines are ordinarily equipped with tabulating mechanism, the frame 3 of which is secured to the carriage at its rear side to receive and guide a series of tabulator blades. 4 occupying progressive denominational positions and operated by tabulator keys 5 through suitable intermediate connections 6. One of the blades 4:, to wit: That one occupying the units position is also operated by a column tabulator key 7 through intermediate connections 8. It will of course be understood that the blades 4 are projected rearwardly to present them in a path obstructed by a fixed tabulator stop which it has not been deemed necessary to illustrate, since all of the machine structure necessary to a complete understanding of the present invention is shown in the drawings and is illustrated and described in greater detail in my Patent No. 1,280,679, granted October 8, 1918. Suffice it to say that upon the operation of a tabulator key, one of the stop blades 4 is projected rearwardly, and at the same time the carriage escapement, illustrated generally at 9, is released.

The carriage then, under the impulse of its propelling mechanism advances until arrested by the contact of the projected stop blade with the fixed tabulator" stop. Associated with the series of stop blades 4 is a universal retracting bail 10 which is urged rearwardly against the resistance of retract" ing springs 11 by the movement of any blade to its active position. Upon the re lease of the key the escapement of the machine is restored to normal condition and the springs 11 retract the bail 10 and with it the stop blade which has served to arrest the carriage in the desired position.

The only other elements of the usual machine structure requiring reference are the carriage feed rack 12 which is relatively stationary, being rigidly mounted on a frame 2, and the feed pinion 13 which is geared to the rack 12 and is journaled on the carriage for control by the escapement.

With this understanding of the usual machine structure, we may now proceed to describe the brake mechanism in the construction and relation of which the present invention particularly resides.

Mounted to swing at one end from a bracket 14 fixed to the under side of the carriage, is a brake carrier 15 having the form of an arm, the front end of which is offset and equipped with a journal 16 Mill on which is mounted to rotate, a brake pinion 17 disposed directly :above and toothed to engage the rack 12. Assuming such engagement, it isevident that a brake applied to resist the rotation of the pinion 17 will effect a retarding or braking connection on the carriage, since advance movement of the latter must be accompanied by movement of the pinion along the rack. I therefore surround the hub 18 of the pinion 17 with a ,brake ring 19 of fiber, rubber or other frictional material which is urged into frictional contact with the outer side face of the pinion 17 by a brake spring 20. This spring is preferably in the form of a spider, mounted on the reduced end 21 of the journal which is threaded, as

interposed between the ring 19 and the spring 20, and is provided with pins 25 extended into openings in the ring. The disk 24 may be non-rotatably secured to the journal 16 in any suitable manner as for instance, by conformin the aperture in said disk to a square or at sided portion of the journal. The construction of the brake proper, its method of re ulation, and its action to retard the carriage will be obvious from the foregoing.

Obviously, the braking or retarding of the carria e is not desirable at all times, indeed under most conditions of operation of the machine the inter osition of a brake would be most undesira le. lit is because of this necessity for its elimination, except under certain conditions, that the brake proper is mounted on the vertically swingingbcarrier 15 which enables the pinion 17 to e moved into and out of mesh with the rack 12. To accomplish this movement, the disk 14 has a projection 26 to which is attached the lower end of a brake standard 27 extended through an openin 28 in the bottom of the carriage and ofiset to permit its upper end to pass through a bracket 29 'carrie by the bail 10. A nut 30 is screwed u on the upper extremity of the standard a ove the bracket 29 and between the bracket and a set collar 31 on the standard 27, is interposed a spring 32.

This spring 32 constitutes a yielding or cushioning member in the line of the connection between the retractin yoke of the tabulator and the brake. T e jar which would otherwise be incident to the throwing in of the brake is eliminated, the separation of the brake from the rack which meaeia might otherwise result from a limited release movement of the key is avoided and, if the teeth of the brake gear and those of the rack do not accurately align to permit smooth intermeshing, the spring 32 will not only cushion'the stroke, but, by its compression when the resistance is met, will store the necessary power to insure the proper meshing of the gear and rack and their retention in meshing relation until the key has been deliberately released.

The operation of the brake will now be understood. Normally, the bracket 29 being in substantially horizontal position holds the brake standard in a position sufiiciently elevated to hold the brake pinion 17 out of mesh with the rack 12. The carriage brake is thus entirely inactive. If, however, the bail 10 is swung by the projection of one of the stop blades 4 to its active position, the bracket 29 will be depressed, thus lowering the pinion 17 into mesh with the rack 12, and holding it in certain engagement by the necessary compression of the spring 32. Therefore the carriage brake will be applied simultaneously with the positioning of a' stop blade and upon the release of the carriage will retard the latter sufficiently to prevent undue shock when the carriage is arrested, and will resist the tend,

ency of the carriage to rebound when thus arrested.

What, I claim is:

1. A machine ofthe class described, including two relatively movable parts, a rack on one part, a movable brake carrier on the other part, a brake mounted on the carrier and movable therewith to engage the rack, tabulating mechanism controlling the movement of the brake carrier, and a re silient member in the line of connection between the tabulating mechanism and the brake carrier.

2. A machine of the class described, including a movable carriage and a relatively fixed rack, a brake mounted on the carriage and movable into and out of engagement with the rack, and yielding means for holding the brake in its engaging position.

3. A machine of the class described, including a. movable carriage and a relatively fixed rack, a brake mounted on the carriage and bodily movable intei. and out of engagement with the rack, said brake including a brake pinion and a brake meniber opposing frictional resistance to the rotation thereof, and yielding means hold: ing the brake in engagement with the radii.

4:. In a machine of the class described, the combination with a carriage and a relatively fixed part, a brake carried by one of said elements and bodily movable to engage the other, said brake including a rotary member and means opposing frictional resistance to the rotation thereof, and yielding means retaining the brake in its efiective v sition.

5. n a machine of the class described, a carriage brake, including a brake pinion a brake member imposed against the same, a spring urgin the brake pinion and brake member into ictional contact, means for regulating the tension of the spring, a rack, and means for moving the brake pinion into engagement with ,the rack and for yieldingly retaining the same.

A machine of the class described, including two relatively movable parts, a rack on one part, a movable brake carrier on the other part, a rotary brake mounted on the carrier and including frictionally en gaged members, one of which is adapted to engage the rack and move relative to' the other member, and means including a spring which is put under tension to move the brake carrier and to yieldingly retain the same. i

7. A machine of the class described, in-

eluding a carriage brake,'which includes frictionally' associated members. 'and is bodily movable into and out of operative position, a spring, and means-for putting the spring under tension to move the brake to. its operative position and to yieldingly retain the same.

8. A machine of the class described, including a rack, a movable carrier, and a brake movable with the carrier, and including a gear to engage the rack, a friction member opposed to the gear to retard. the rotation thereof, a spring urging the friction member and gear into engagement and means connected to the friction member to I move'the carrier and brake toward and from the rack.

In testimony'whereof I hereunto aflix my signature in the presence of two witnesses.

HARRY ARTHUR FOOTHORAP. Witnesses:

J. AZALEA Wrermnn,

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