US740651A - Ribbon-reversing mechanism for type-writers. - Google Patents

Description

No. 740,651. v PATENTED OCT. 6,1908.

W. F. HELMOND.

RIBBON REVERSING MECHANISM FOR TYPE' WRITERS.

APPLIGATION FILED m2. 5. 190,3.- no MODEL. a sums-sum 1.

.INVENTOR WITNESSES:

. BY v I ATTORNEYS TH: mans eas 00., mmauruo wssumcrcu. u. c.

m-mms'l. I PATBNTED' OCT. 6, 1903.-

W. F.-HELMOND. V

RIBBON RBVERSING MEGHANISMPOR TYPE WRITERS.

APPLICATION FILED MAR. 5. 1903.

mi MODEL. 3 snnmssnz r 2.

IINVEN'TUR WITNESSES: I

I ATTORNEYS Tu: "cams PETERS 00., Pam-numb wnmmsmn, n. c.

UNITED STATES- Patentecl October 6,1903

PA T OFFICE.

WILLIAM F. HELMOND, or HARTFORD, CONNECTICUT, ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, on NEW YORK, N. Y., A CORPORATION on new JERSEY;

RlBBON-REVERSlNG MECHANISM FOR TYPE-WRITERS.

SPECIFICATION forming part of Letters Patent No. 740,651, dated October e, 1903.

Application filed March 5,1903. Serial No. 146,321. (No mozlehl To all whom it may concerrt: 4

Be itknown thatLWILLIAM F. HELMOND,a citizen of the United States, and a resident of Hartford, Hartford county,(lonnecticut, have I invented certain new and ,useful Improvements in Ribbon-Reversing Mechanisms for Type-Writers,of which the followingisaspeci fication.

My invention relates to type-writing ina-- chines and the like in whicha printing-ribbon is shifted during the operation of the machine, so as to secure a uniform wear of the ribbon, and in which the direction of the ribbon-feed is periodically reversed.

The object of my invention is to providea mechanism of the above-indicated class that will operate with certainty and with the expenditure of very little power, so that the re versing of the ribbon will takev place .at theright moment without putting any undue strain on delicate parts, such as the ribbon itself. I

My invention will now be fully described with reference to the accompanying drawings, and the features of novelty will thenbe point-' tail sectional elevation illustrating the elas-,

tic means for shifting the reversing-shaft.

Each of the ribbon-spools A is carried upon a shaft B, journaled in a frame O of the machine, and provided at'its lower. end. with a,

beveled wheel B. These wheels are adapt ed for alternateenga'gement with beveled pinions D D which are rigidly secured upon the reversing-shaft D, Whichis mounted in bearings 0, not only to turn but to slide in them. The distance between the beveled pinions D D -is less than the distance between the two beveled Wheels B, so that only one of the pinions can be in mesh at a time. Upon one end of the shaft is mounted a crankD Fig. 4 is an for the purpose of manually adjusting the ribbon E. \Vith the shaft is further connected, as byrneans of an arm D on the crank D 1a ratchet-wheel F, engaged by a spring-pawl G to prevent a return movement of the ratchet-wheel, the said pawl being secured to a fixed portion of the frame.

By reference to Fig. 2 it will be seen that I the end of the arm D which engages the ratchet-wheel F is parallel with the shaft D, so that the shaft, with the said arm, may be 'rnoved lengthwise, bringing the arin out of engagement with the ratchet-Wheel, which latter does not share the longitudinal motion I the central ribbon=guide Nin any suitable manner.

It will be understood that mechanism for imparting an intermittent rotation to the reversing-shaft D and for actuating the ribbonguide forms no part of my present invention.

Adjacent to each ribbon-spool I prefer to arrange a stationary ribbon-guide O, preferably carried by a bracket 0. Between the two end ribbon-gu ides O and adjacent to each of them I locate a movable ribbon-guide P, preferably U-shaped, as shown best in Fig. 3. Each of these' movable guides is carried by a crank-arm P upon a shaft P, which is journaled in stationary bearings P adjacent to the bearings of' the shaft B. of each shaft P is bent-so as to clear the beveled wheel B and is then further bent to extend to the side and preferably also under the reversing-shaft D, as shown at P These portions P of the shafts P form crank portions adapted to engage collars Q, which are The lower end 1 slidable lengthwise upon the shaft D, the arrangement being such that the crank portion P is between the collar Q and the beveled pinion D or D pressed toward the crank portion P by a spring R, coiled around the shaft D and having its other end in engagement with a collar S, which is rigidly secured upon the shaft D or at least is held to slide therewith. The ribbon E is provided near its ends with suitable projections E, adapted to collide with the corresponding movable guides P, so that as the end of the ribbon Winds ofi the spool the corresponding guide P will be swung in such a manner as to press the collar Q toward the collar S. In order that the shaft D may be shifted suddenly, I provide suitable mechanism for retarding the shifting of the shaft until the crank portion P has moved to a certain extent. This mechanism, as shown, consists of two grooves D provided at one end of the shaftD and adapted to be engaged by a ball T, which is pressed into either one of said grooves by'a spring U, the tension of which maybe adjusted by means of a setscrew V. The spring and set-screw are contained in a sleeve W, which is adjustable in the frame of themachine toward and from the shaft D and which may be held in its adjusted position by means of a set-screw X.

It will be understood that the movement of the movable guide P and the resultant movement of the crank portion P will at first only compress the spring R until the tension of said spring will be sufficient to overcome the resistance which is opposed to the longitudinal movement of the shaft D by the retarding and locking ball T. Thus in Fig. 2 the spring R at the right-hand portion ofthe machine is shown in a compressed condition at the moment immediately preceding the shifting of the shaft D. When the tension of the compressed spring is sufficient, the ball T will rise on the curved or inclined surface of the groove D and the spring R will expand and throw the shaft D from left to right. This throws the beveled pinion 13 into engagement with the beveled wheel B, and thus causes the ribbon to be reversed. A similar action will take place when the other end of The collar Q is normallyitself is shifted suddenly, thus securing a positive action.

Various modifications may be made with out departing from the nature of my invention.

What I claim as new, and desire to secure by Letters Patent, is-

1. Inatype-writing machine or the like, the combination ofa movable ribbon-guide,means for feeding the ribbon, mechanism for reversing the direction of the ribbon-feed and a yielding connection between the movable ribbon-guide and the ribbon-reversing mechanism.

2. In a type-Writing machine or the like, the combination with the shafts or spindles of the ribbon spools, ofa longitudinally slidable.

shaft arranged to drive one or the other of the ribbon-spool spindles, means for rotating said shaft, a movable ribbon-guide, and means operated by the movement of said ribbonguide for shifting the said shaft.

3. Ina type-writing machine or thelike, the combination of the ribbon-spool spindles, a longitudinally-slidable shaft adapted to drive one or the other of said spindles, collars slidable on said shaft, movable ribbon-guides, an operative connection from each of said guides to the corresponding collar to shift the latter by the movement of the ribbon-guide, and a spring thronghthe medium of which the movement of the collar is transmittedto the shaft when the spring has acquired the requisite tension.

4. In a type-writing machine or thelike, the combination of the ribbon-spool spindles, a longitudinally-slidable shaft adapted to drive one or the other of said spindles, movable ribbon-guides, means for shifting said shaft by the movement of the ribbon-guides, and a retarding device for opposing a resistance to the longitudinal movement of said shaft.

5. In a type-writing machine or thelike, the combination of the ribbon-spool spindles, a longitudinally-slidable shaft adapted to drive one or the other of said spindles, a retarding device engaging said shaft and pressed against the same transversely to oppose a resistance to the longitudinal movement of the shaft, movable ribbon-guides,collars loosely mounted on shaft so as to be capable of sliding thereon, a yielding connection between each collar and said shaft, and an operative connection from each ribbon-guide to the corresponding collar.

In testimony whereof I have signed my

Images