US831935A

US831935A - Type-writing machine.

Info

Publication number: US831935A
Application number: US28906805A
Authority: US
Inventors: Frank A Cook
Original assignee: Underwood Typewriter Co
Current assignee: Underwood Typewriter Co
Priority date: 1905-11-25
Filing date: 1905-11-25
Publication date: 1906-09-25
Anticipated expiration: 1923-09-25

Description

PATENTED SEPT. 25, 19064 P. A. COOK. TYPE WRITING MACHINE.

APPLICATION FILED NOV. '25, 1905.

2 sums-sum 1.

a m a: I

a 4. QVN

,Witnesses PATENTBD SEPT. 25, 1906.

F. A. COOK. TYPE WRITING MACHINE.)

APPLICATION FILED NOV. 25, 1905.

2 SHEETS-SHEET 2.

IO and reversing preferably, a horizontal further revolution 4o ratchet with cooperating parts, the letter details of t FRANK A. COOK, OF HARTFORD, CONNECTICUT,

TYPEWRITER COMPANY, OF NEW YORK,

NEW JERSEY.

ASSIGNOR To UNDERWOOD N. Y., A CORPORATION OF TYPE-WRll'lNG MACHINE.

Specizfication of Letters Patent.

Patented Sept. 25, 1906'.

Application filed November 26, 1905. Serial No. 289,058-

To all whom it may concern: Be it known that I, FRANK A. Ooox, a citizen of the United States, residing in Hartford, in the county of Hartford and State of Qonnecticut, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

This invention relates. to ribbon winding mechanisms of type-writing and other machines.

The object of the invention is to produce a simple and reliable mechanism for reversing the travel'of the ribbonwhich can be called into operation at the completion of the unwinding of the ribbon from either spool without liability of straining the ribbon and which will act with promptness.

In carrying out m invention I employ,

driving-shaft movable endwise to connect with either one of a pair of spool-shafts. Upon said shaft I mount oosely two ratchet-wheels, which are idle during the travel ofthe ribbon; but When either spool becomes depleted a pawl is caused to engage its associated ratchet-wheel to arrest the same. Upon said ratchet-wheel is provided a cam, and upon the driving-shaft is provided a coacting cam, whereby during of the shaft the latter is cammed endwise to connect with the empty s 001. A similar operation is performed at the other spool when the latter becomes empty.

The invention also includes improved means for ion arting intermittent rotation to the driving-s aft.

In the accompanying drawings, Figure 1 is a sectional elevation illustrating areversing shown in full lines in wor g positions. Fig. 2 is a plan illustrating the reversingmechanism associated with one of the spools, the parts being shown in full lines at the moment when the reversing operation has been completed. Fig. 3 is a ers ective view of the mechanism, the leftan s 001 shown full of ribbon and the right-hand reversing-mechanism bein about to operate. Fig. 4 shows lie parts which wind the ribbondriving shaft. Fig. 5 is a sectional front elevation of said winding parts. Fig. 6 shows details of the reversing members.

In the well-known .Underwood type} writing machine in connection with which my invention is illustrated types 1' strike rearwardly against the front side of a platen 2. A ribbon 3 is threaded through avibrator 4 and'wound upon spools 5 6. Th are carried by vertical shafts 7 8, upon their lower ends bevel-pinions mesh with bevelpinions 11 12, fixed upon a horizontal driving-shaft 13, which is rotated intermittently by means of a crank 14, 'a link 15, and rock-shaft 16, the latter being rocked at each type-stroke and the crank 14having a clutch connection to the shaft 13.

At Fig. 3 the pinions 9 11 are seen in mesh, so that the ribbon is winding on the full spool 5, the other spool 6 being empty. An obstruction 17 at the end of the ribbon engages a finger 18, which extends up from an arm 19, the latter fixed upon a vertical rock-shaft 20, so that the obstruction '17 will cause the shaft 20 to turn. Uponthe lower end of the latter is provided an arm 21, which at such turning movement releases 'a pawl 22 and permits it to drop into engagement with a ratchet-wheel 23, which'is loose pawl is pivoted at it may prevent rotation The arm 21 normally formed upon the pawl, use; but when said arm is rocked by the ribbon it releases the pawl, and a weight 26,

e spools having 9 10 to 24 upon a fixture, so that of the ratchet-wheel.

formed upon the pawl, causes the latter to drop into the ratchet. To the side or face of the ratchet is fixed a cone 27, which projects into the path of similar cones 28, which roject from the side ing fixed to the shaft 13, so as .to rotate therewith. The cone 27 beingstationary, the

nearest cone 28 rides thereon during the further rotation of the shaft 13 and cams the latter endwise or toward the right at Fig.3 until the pinion 12 is brought into mesh with the pinion l0 and the ribbon begins to wind upon the empty spool 6. A spring 30 returns the rock shaft 20 to normal osition and causes the arm 21 to lift the paw 22 from the engages a finger 25, so as to hold it out of of a disk 29, the latter be-' i upon the shaft 13. The

ratchet 23. The last part of the endwise movement of the shaft 13 is effected by a spring 31, Fig.2, which is connected-to a plunger 32, sliding in a box 33 andhaving a cone-head 34 to fit in either of a pair-of V- grooves '35 36, formed in a collar which is mounted upon the shaft 13. After the point of the detent 34. rides over the ridge 37 be tween said V-grooves the spring 31 has sulli cient force to cam the shaft endwise by the engagement of the detent 34 with the inclined wall of the adjoining groove. During such endwise movement of the shaft another set of cams 38 upon another disk 39 is moved into position to engage a cam 40, provided upon the other ratchet 41 but said ratchet may revolve idly, since its pawl 42 is held up by an arm 43, corresponding to arm 21 and fixed upon a shaft 44, having a ribbon-engaging finger 45, corresponding to finger 18. Movement of the ratchets in axial direction is prevented by fixed projections 46, inserted between the ratchet-wheels, and collars 47, secured upon hubs -18 of the ratchet-wheels.

The crank 14 is provided with a recess 49., Fig. 4, in which is placed a ball 50, which runs upon a bushing 51, which turns with the shaft 13. Said bushing turns in a bearing formed in a fixed bracket 52'and has fixed upon its outer end a collar 53, from which projects a stud 54, loosely engaged by a crank 55, fixednpon the end of the shaft 13. The shaft and bushing 51 are hence caused to turn together, while the shaft may move endwise independently of the bushing, the stud 54 being long enough to permit such play. -A handle 56 may be formed upon the end of the stud 54 for winding the ribbon, and the other end of the shaft may be also provided with a crank 57. The ball works .between the periphery of the bushing 51 and aninclined wall of the recess 49, so as to grip said bushing when the crank 14 turns in one direction, but to run idly when the crank runs in the other direction, so that the shaft 13 is ro-.

t-ated.step by step at the operation of the types. It will be seen that the bushing 51 is provided. with a head 58 to confine the crank 14 and that a fixed disk 59 is interposed between the collar 53 and the bracket 52, whereby end'wise movement of the bushing and other parts is prevented. The fixed disk 59 is provided. with a recess 60 and ball 61, engaging the bushing 51 and preventing backward rotation of the shaft 13.

Variations may be resorted to within the scope of my invention and portions of my improvements may be used without others.

Having thus described my invention, I claim 1. In a ribbon-reversing mechanism, the combination with a pair of ribbon-spool shafts, of a transverse driving-shaft, two

pairs of cooperating cams upon said drivingshaft, one cam in each pair com'iectedto the shaft to rotate therewith and the other cam in each pair loose upon the shaft, and means controllable by the ribbon for locking the loose cams against rotation so that they co operate with the rotating cams to shift the shaft endwise.

2. In a ribbon-reversing mechanism, the combination with a pair of ribbon-spool shafts having gears, of a driving-shaft having gears toanesh with said gears in alternation, two pairs of shaft-shifting cams upon said driving-sh aft, one cam in each pair connected to the shaft to rotate therewith, and the other cam in each pair loose upon the shaft, means for locking said loose cams alternately against rotation, and means releasable through the ribbon movements for holding said locking means in idle position.

3. In a ribbon-reversing mechanism, the combination wit a pair "of ribbon -spool shafts,.of a driving-shaft, two pairs of shaftshifting devices, each pair consisting of a cam" and a wheel having a circular series of cams,

one device in each pair connected to thedriving-shaft-to rotate therewith, and the other device in each pair being normally idle, and ribbon-controlled mean s for locking one in ember of each pair so that it may cooperate with its companion to shift said driving-shaft.

4. In a ribbon-reversing mechanism, the combination of a pair of ribbon spool shafts, a drivingshaft, two pairsv of normally ineffective cam devices 11 )on said driving-shaft, and means controllable by the ribbon move ments for causingthe devices in one pair ill? ternately with the devices in the other pair to cooperate to reciprocate. said driving-shaft.

5. In a ribbon-reversing mechanism, the combination with a pair of ribbon-spools, and a common driver, of two pairs of normally inefiective rotatable cam devices, and means controllable by the longitudinal movements of the ribbon for rendering said pairs of cam devices alternately effective to cause shifting moven'ients between said spools and said driver.

6. In a ribbon-reversing mechanism, the combination with a pair of spool-shafts and a driving-shaft, of two wheels fixed upon said driving-shaft and each carrying a circular series of-cams, a loose toothed wheel associated with each of said cam-wheels, said toothed wheels having cams toeooperate with. said cam-wheels, pawls for holding said toothed wheels stationary, and means releasable by the ribbon for holding said pawls in effective position.

7. In a ribbon-reversing mechanism, the combination with a pair of spool-shafts and a driving-shaft, of two wheels fixed upon said wheels stationary, springs which hold said pawls out of effective position, and parts extending into the path of the ribbon so as to be moved thereby, for releasing said pawls.

8. In a ribbon-reversing mechanism, the combination with a pair of spool-shafts and a driving-shaft, of two Wheels fixed upon said driving-shaft and each carrying a circular series of cams, a loose toothed wheel associated with each of said cam-wheels, said toothed wheel having cams to cooperate with said cam-wheels, pawls for holding said. toothed wheels stationary, rock-shafts'having arms extending into the path of the ribbon so as to be moved thereby, springs holding said rockshafts in normal position, and arms upon said rock-shafts holding said 'pawls away from said tooth ed wheels. i

9. In a ribbon-reversing mechanism, the

- combination with a pair of spool-shafts and a driving-shaft shiftable endwise to connect with said spool-shafts, of toothed wheels loose upon said driving-shaft, means preventing said toothed wheels from shifting axially with said driving-shaft, cams upon said toothed wheels, cam-wheels fixed upon said driving-shaft to cooperate with the cams upon said toothed wheels, pa'wls for holding said toothed wheels stationary, springs hold-' ing said pawls out of effective position, and ribbon-controlled means for releaslng said pawlsin alternation.

10. In a ribbon-reversing. mechanism, the combination with a pair of spool-shafts, of a ."driving-shaft shiftable endwise to connect with said'spool-shafts, toothed wheels loose upon said driving-shaft, cams projecting lat- 'erally from said toothed wheels, means preventing said toothed wheels from shifting axially with saidshaft, wheels fixed upon.

said driving-shaft and each provided with a series of cams rojecting laterally toward said toothed w eels, normally ineffective means for holdin said toothed wheels against rotation, and ri bon-con'trolled devices for causing said holding means to engage said toothed wheels.

' 11. In a ribbon-reversing mechanism, the combination'with a ribbon -spool having a car, of a driving-shaft having a gear, means eing provided for unwinding the: ribbon from said spool while said gears are out of mesh,- cooperating cams upon said drivingshaft, one cam connected to the shaft to rotate therewith and the other cam loose upon the shaft, and means controllable bythe said loose member having a series of teeth, a pawl, a spring-controlled member for holding saidpawl normally out of engagement with said teeth, and means for enabling the move ment' of the ribbon to release said pawl so that it ma engage said teeth to lock said her in position to cooperate with said shifter,

loose mem er against rotation, so that the latter may cooperate with said shifter to 13. The combination with a pair of spoolshafts and a driving-shaft-movable e'ndwise' to connect with either spool-shaft, of a bush ing or collar upon saiddriving-shaft, a stud projecting from said bushin a crank loosely engaging said stud and fixe upon said shaft, means'for preventing said bushing from movingin. axial direction, and a crank mounted loosel upon said bushing and having a ball or-rol er-clutch connection therewith.

14. The combination with a pair of spoolshaftsand a driving-shaft movable.'endwise to'connectwith either spool-shaft, of a bush-' .ingor collar upon said driving-shaft, a stud projecting fromsaid bushin a crank loosely engaging said stud and fixe upon said shaft means for preventing said bushing from moving in axial direction, and a crank mounted looselyupon said bushing and having a ball or roller-clutch connection therewith, and a fixed member. also having a ball or rollerclutch connection with said bushing for preventing backward rotation of the driving-, shaft FRANK A. oo'oK;

Witnesses:

- Enw: J i MANNING,

Enw; PFSToRY.

s effect shifting movement between said spool and said driver.