US670477A - Type-writing machine. - Google Patents

Description

No. 670,477. Patented Manzs, |9n|...f

w. n. Fox a a. .1. BARRETT'.

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(Application mea me. 9,` 169s.)

(No Model.)

IIIIIIHIIIIM UNTTED STATES PATENT OFFICE.

WILLIAM R. FOX AND GLENN BARRETT, OF GRAND RAPIDS, MICHIGAN.

TYPE-WRITING MACHINE.

SPECFICATION forming part of Letters Patent No. 670,477, dated March 26, 1901.

Application 'filed December 9. 1899.

To wl whom it may concern,.-

Be it known that we, WILLIAM R. FOX and GLENN J. BARRETT, citizens of the United States, residing at Grand Rapids, Michigan, have invented certain new and useful Improvements in Type-Writing Machines, of whichthe following is a specification.

Our invention relates to type-writing Inachines, and is confined to the structure and arrangement of the carriage-shifting and platen-feed mechanisms.

To this end the invention includes a device for th rowing out of operation the usual platendetentand applying a brake to the platen, so as to permit of a movement of the platen to a greater or less extent than is permitted by the relative arrangement of the ordinaryT detent and platen-ratchet, the brake holding the platen in position when moved.

The invention further includes the mechanism Afor shifting the platen from lower to upper ease, this mechanism comprising a roller having adetachable engagement with a rear bar on the platen-frame, with means for shifting said roller and for locking the shifting mechanism.

The invention also includes the details of construction tofbe hereinafter described, and particularly pointed out in the claims.

The invention is illustrated in the accompanying drawings, in Which- Figure 1 is a detail sectional elevation of sufficient of a machine to illustrate the invention. Fig. 2 is a plan view, and Fig. 3 is a detail view.

From each side of the top;plate of the frame, forward of the track a, a stud g extends upwardly, in which a rock-shaft h is journaled, centrally of which a rodi is secured, extending upwardly and having a roller 7' journaled to the end thereof, which is normally in engagement with the rear rod of the platenframe. The platen-frame is of similar construction to that disclosed in our patent No. 614,943, granted November 29, 1898, and is similarly supported upon the front and rear links d d", so the platen may be rocked from front to rear.

From one end of the rock-shaft h a horizontal arm n extends, which is connected at its outer end to the shift-lever 0. On the depression of the shift-key the roller through Serial No. 739,823. (No model.)

this bellcrank arrangement is pressed against the rear rod of the platen-frame, and the platen is thus rocked forwardly. In the raising of the platen to inspect the work, as described in the before-mentioned patent, the rear rod m of the platen-frame is lowered and simply moves out of contact with the roller. The shiftkey has a supplemental piece p pivoted to its forward end, which carries the finger-disk. The rear end of this piece is forked and is limited in its pivotal movement by the stop-pin o', while the forward end thereof has a shoulder or projection, and b/y first depressing the key-lever through the supplemental piece by a direct downward action on the finger-key the shiftof the platen will be effected, and then by tilting the supplemental piece by the forward movement of the key-disk the shoulder s will be pressed under the projecting ledge ton the machineframe and the platen will be locked in its forward position. Y

For writing on `lined paper the ordinary line-spacing mechanism will not space the paper to exactly correspond to the spacing of the lines. To provide for this in the construction of platen-operating mechanism disclosed in the before-mentioned patent,which provides a spring-arm carrying aroller-detent engaging the platen ratchetwheel, a U- shaped frame u incloses the Vdetent-roller o, having the legs w w provided on the extended ends of the pivot of said roller. The frame when the roller-detent is in engagement with the platen-ratchet rests upon the spring-arm y, carrying said roller in a posi.- tion parallel therewith. To disengage the roller, the frame is raised, which will bring the end of the leg w into engagement with the platen and force the roller upward against the tension of the spring-arm t/,which tension serves to press the end of the arm w against the platen and provide a brake therefor. An arm 2 may be extended upwardly from the carriage-frame to provide a bearing'and support for the end of the leg w to prevent the twisting of the frame fa. When the roller is disengaged, the operator may turn the platen lthe desired distance by means of the platen hand-wheel, and the brake will maintain the same in the position to which it -is adjusted. When the platen is rocked forward by the de- ICO pression of the shift or upper-case key, its movementI is arrested bythe adjustable stops c, carried by the standard d, said stops contaotingwith fthe platen-shaft. A similar stop c' arrests the movement of the carriage to the rear. On the release of' the shift-key the platen is returned by the springt` e, secured at one end tothe platen-frame and wound around the shaft f and secured at its opposite end in a collar fixed thereon. The links d', to which the links C'", carried by the platen-shaft, are secured, are iixed to each end of this shaftf.

We elaim as our invent-ionl. The combination in a type-writingr machine with a platen, a tilting: platen-frame having a rear bar and movable supports for said frame to permit the latter to be shifted from lower to upper ease, of a shift-key, an ar-m independent ot' said supports adapted to be tilted by the depression of said key, and a roller Carried by said arm engaging the rear bar of said frame, substantially as described.

2. The combination in a type-Writing machine with a platen, a tilting platen-frame havingr a rear bar and movable supports for said frame, of a shift-key, a bell-erank lever independent of the supporting means having a Connection to the shift-key and a roller earred by one member of said lever engaging the rear bar of the platen-frame, said bar moving),r out of engagement with said roller when the platen-frame is tilted, substantially as described.

3 The combination with the platen, the platen-frame, and a ratehet-Whee carried by the platen, of a dat spring-arm secured atene end to the platen-frame, a roller-detent earried at the other end oi said arm, and a device carried by the springarm adapted when tilted to iind a bearingr directly on said platen and to litt said arm to disengage said detent, said bearing end providing a brake for said platen.

4. The combination with a platen, a platenframe, and a ratchet-wheel secured to the platen, of a fiat spring-arm secured to the frame at one end, a roller-detent secured to the opposite end of said spring, a U-shaped frame straddling said spring-arm and secured thereto said frame having one ond adapted to tind a bearing directly. on said platen, and a iixed standard providing a bearing for the other end of the frame to prevent the twisting of said spring-arm, substantially as described.

In testimony whereof We affix our signatures in presence of two witnesses.

VILLIAM R. FOX. GLENN J. BARRET". Witnesses: i

G. K. MCMULLEN, WILL. C, HOERTZ.

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