US936257A - Device for automatically reversing the travel of type-writer ribbons. - Google Patents

Description

. 0. RUTISHA-USER.

DEVICE FOR AUTOMATIGALLY REVERSING THE TRAVEL OF TYPE WRITER BIBBONS.

1 APPLICATION FILED AUG. 21, 1908. 936,257.

' Patented Oct. 5, 1909. .9 f I g,

,ywf/ W MWWJ versmg the travel of the 936,20 1 p ifi of Letters Patent Patented Get. 5, 1909. Application filed August 21, 1908. Serial No. 449,694. To ollgohom it may concern: 1 the arms, stands level with the reel. There Be it known that 1, Oscar RUTISHAUSER, a subject of the Swiss Republic, and resident of St. Gallen, Switzerland, have invented an Improved Device for Automatically Reversing the Travel of Type-\Vriter Ribbons, of which the following is a specification.

' The subject of the present invention is a device for automatically reversing the travel oftypewriterribbons. In this device when the ribbon is completely unwound from one of the reels, the tension of one arm of a right angled lever and moves it, whereby a slide connected to the other arm of the lever is made to change its po- The aim of H115 device is to effect drive sition. the transposition of the pawls which the reels. A d automatically reribbon has been made known by the German specification No. 184,042, lass 15. The device for moving the slide in the latter arrangement does not cause the reversing of the reel drive directly through the slide, as the latter is only used as a connecting linkbet ween two devices which are coupled together, one being moved by the ribbon and by the force of the spring driving the slider, while the other causes the alternate engagement and 'sengagement of the wheels driving the ribls under the influence of the spacing device. The accompanying drawing shows a form of the present invention, Figure 1 being a front View of the gear for automatically reversing the ribbon, and Fig. 2 a plan of he same. Spindles d are fitted on both sides of the typewriter frame a, and are guided in the eyes 6, b and 0,4 Plates 0 are carried at the 'uppe'rends of't-hese spindles. whose cylindrical bosses f are provided with five or more grooves g. The reels 72 are accurately fitted on the bosses f and keys 2' are driven into the grooves f/ so that any turning of the spindles causes the reels to revolve also. At the lower end of the spindle (Z, the small toothed Wheel 75 is fitted and fixed to it by a pin Z driven' through boss and spindle.

Between the eyes 71 and c and 72 w respectively, are short lengths of pi pe m andv m respectively.

These pieces are revolullly mounted on the spindle r] and have respectively arms a and 12 and n and o attached to them. The first two are so situated that a loose sleeve 1, seated upon the stops upon the ribbon acts upon is also another loose sleeve on each side fitted on a pin on arms 2) which are fixed to the machine frame. Pins 9 and g respectively fitted on the same arm serve to prevent the ribbon, which passes between them andthe sleeve 1 from falling down. The lower arms 0 ando are connected respectively by pins 8 to semicircular pieces t andt the other end tongue pieces which are u to theplates o. The screws u-serve also to fasten the plates 0 to the rod 20 which passes through the frame (Z, and lies in bearings in the frame so that it can be accurately s of which end in connected by screws adjusting rings at. The rod to vided with two notches 3 into which a spring mounted at a snaps as soon as the rod moves to one side or the other. Shoes 2 are provided in the plates c, which serveas guides for the hook shaped ends of the rods 4, .which rods are connected to the cranks These shoes place by springs 5 and cause the hooked ends of the rods 4 to engage with the toothed wheels according to the direction of rotation.

he above described apparatus works as followsz-The cranks 3 which are fixed on the shaft 6 are-actuated by the keys of the typewriter in the usual manner by means of suitable transmission elements. -tion actuates the rods 4 so that by the engagement and disengagement of one or the other hook, the respective toothed wheel revolves and the ribbon is wound up or unwound. The automatic reversal of the motion of the latter is effected in this way. At the moment when the ribbon on one of the. reels is exhausted, the slight jerky movement of said ribbon caused by the tension setup on the other the lever previously in contact therewith to be pushed away with its sleeve, and the other arm and sleeve comesinto contact with the ribbon. Simultaneously, the lower arms which are firmly fastened to the pipe piece are respectively pushed away from, and into contactwith, the toothed wheel, and consequently the rod 4 turns the toothed wheels and therefore the reels in the opposite direction. The correct position-of the shaft a: with the guide plates v for the rods 4 is insured by a spring 'which snaps into notches in the shaft: and

and 72 respectively,

adjusted in an axial direction by means of.

is also pro-- This mo-' Having; fully described my invention what 1" claim and desire Lo secure by 'i iette'isPM- eompu. in ei' donation, with reels for the ribbon, spindes d) on w iiLh said reels are mounted, tooihed wheels on said spindles rods ee) for actuating said toothed Wheels, ziriiis revolubiy mounted on said spindles, a transversely slidabie shaft (10), the rods for actuating said toothed'wheels being fixed to -.2 travel if the ribbons,

eases":

sid shaft (w), so that they are disengaged 5 from one toothed Wheel and engaged with "be other when the shzii niw) is moved, means for securing said shaft {w} in position after movement, substantially as descri ed and show I "in testimony whereof I. have hereunto set my hand in the presence of two subscribing witnesses.

SEGA-$8 RUTiSHAUSEB.

i fi'tnesses U. GUBLER, (i; EHRLE.

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