US1643266A

US1643266A - Typewriting machine

Info

Publication number: US1643266A
Application number: US142735A
Authority: US
Inventors: Aichele Gottlob
Original assignee: Daimler Benz AG
Current assignee: Daimler Benz AG
Priority date: 1924-03-27
Filing date: 1926-10-19
Publication date: 1927-09-20
Anticipated expiration: 1944-09-20
Also published as: FR620907A

Description

" Sept. 20 1927.

- G. AICHELE TYPEWRITING MACHINE Filed Oct. 19. 1926 BY MAM/M4K Patented Sept'. 20, 1927.'

uNi'ran .STATES 4Muir.ISJT oFFicE.

GorrLoB AICHELE, oE NELLINGEN' NEAR ESSLINGEN, ."GEniiiAN'm nssieNon, BY MESNE ASSIGNMENTS., 'ro DAIMLER-BENZ AKTIENGEsELLscirAE'r, or BERLIN, cna,

MANY.

TYPEWRI'TING MACHINE.

Application led October 19, 1926, Serial No. 142,735, andv in Germany Marchl 27, 1924.

This invention comprises improvements in and connected with reversibleribbon feding mechanisms for typewriting and hke machines and is concerned with mechanisms lof the type in which the reversal of the ribf4 .bon feed vis initiated by a pin arranged in the hollow vertical spindle of a bobbin and which is permitted to fall or move axially upon the unwinding of `the ribbon from that bobbiwmfV vThe object of the invention is to' attain elements as' yare liable to derangement.

According to this invention, a lever, oscillated by the bobbin drive communicates osci'llatory movement through a rod arrangement to a second lever which operates upon tongs-like feed levers, the axially movable pin in the bobbin being adapted, When released, to so modify the oscillation of the second lever as to bring about an operative engagement of the feed levers of the empty bobbin and a disengagement ofthe feed levers of the full bobbin, the said feed levers being engaged or disengaged by closing movement towards one another or by opening movement away from one another, as

the case may he.

The driving lever and the second or reversing lever of each bobbin are preferably arranged to oscillate aboutfa common pivot and the rod connection between the reversing levers is advantageously mounted slidably within a bore of the rod which transmits the motion from onev driving lever to the other. i

The mechanism in accordance with this invention is distinguished by the employment of a comparatively small numbercf veryv simple parts, with avoidance, as far-as vpos'- sible, of cranks. The mechanism also'is distinguished by parts moving inthe same plane 5 kor in parallel planes,. as far as possible,

whereby bending or distortion ofthe small.4 parts functioning in the transmission 1s pre-1 vented.

In order to enable they invention to be readily understood, reference is made to the accompanying drawing illustrating one embodiment of the invention by way o-f example, in which drawing Figure 1 is a view from below of a re-V .reversal from the position seen in Figure 1.

12. Toothed rack levers 21 and 22 are versible ribbon feed mechanism embodying the invention showing the parts in the position for winding on'by the left hand spool and unwinding by the right hand spool.

Figure -2 is a view of the mechanism after Figure 3 is a sectional side elevation of Figure 1.

Figure 4 is a vertical section 'through one of the spools and its associate parts.

Referring tothe drawings, 1 is a cover plate with

housings

2,3,l for the spools, lthe spool pivots or spindles 4` bein mountedl central y within the housings. Ihe spools 5 are mounted on their'spindles 4 in known manner bein secured vby knurled nuts 6, for example. T e lefthandbobbin 5 is adapted for being driven by a spring througha mechanism which acts upon the bevel wheel 7. The last named is mounted upon the spindle part 8 of the cam 9 which is arranged in a 'bearing bracket 10. A pin or roller 11 on the lever 12 engages with the cam 9 lfor oscillating the lever 12 about the pivot 13,- the end of the lever 12 being shaped for receiving` guidance in the guide 14 of the bearing braclret 10. An arm 15 of the lever 12 engages in an aperture in an extension at kone end of a hollow. rod 16, as will be readif ly understood by comparing Figures 1 and 3,

an extension at the opposite end of the rod 16 being similarly -engaged with an arm of a lever 17 corresponding with the

lever

12, 15. The lever 17 oscillates about apivot 18 Vmounted in the bobbin housing 3. The end 19 of thek lever 17 is guided in a-recess 20 90` corresponding with the guide 14 of the lever 1v. otally mounted on. the leverf12 atvtlie polfnts 23,024, and 'their' free ends are connected together by a spring 25 which constantly tends to bring vthe levers together and hold them against opposite points of the toothed wheel 26 on the left hand spool spindle 4. Toothed rack levers 27 and 28 are pivotally mounted at 29, 30 on the lever 17, the free ends of these levers being connected together by a spring 31 constantly tending to hold them in mesh withl opposite points of the toothed wheel'32 on the spindle of the right hand spool. f

In Figure y1 it is assumed that the spool in the housing 2 is winding on and that the spool'in the. housing 3 is unwmding. In

operation,

wheel 7 and Vthe lever 12 is oscillated owing the cam 9;.is driven by the Ibevel to the engagement with the cam 9 of the pin or roller 11. The rack levers 21 and 22 mesh with the toothed wheel 26 .owing to the action of the spring 25, the wheel 26 being of the ratchet type and the teeth ofv the

levers

21 and 22 being directed so that.

on one swing the teeth of the lever 22 slip, the reverse being the case on the opposite swing.' Continuous' motion is thus imparted to the spool spindle and being uniform owing to the heart-shape. 'of the cam 9. Meanwhile, the rack levers v27,l 28 of the other-spool are out of engagement with the wheel 32 as seen in Figure 1, being spread apart by a mechanism hereinafter described, but they move .to and fro with the lever 12 and rack levers 21. and 22'owing to the rod 16 'connecting together the levers 12 and 17. This operation continues. and the left hand spool continues to wind on and the right hand s ool'continues to unwind under the pull of di 33 which drops under its own weight, a pro-- lower end'of the pin or rod 33;-.

jection on the then. enteringla slot 37 formed 1n an enlarged art 38 ont e end of a reversing lever 39.

ne lever 39 is mounted on the pivot 13 in association .with the lever 12 and another lever39 is mounted on theipivot -18 in association with the leverI 17. VThe upper ends 40 of the levers 39 are engaged by pm and fork engagement 'with-the extended of the hollow rod 16.* The enlargements 38 of the levers ,39' are tted with pins 43 formed edges` :on end 4adapted' for engaging suitably inclined and rack levers 21,`22v and 27 28. 'Figure 1,

' the pin 43 of the left gether by the spring hand `lever 39.1'iso out of engagement with the consequence that` the rack levers 21, 22 are freet'o be pulled to- 25 so that -they are :ff held in mesh with the ratchet .26. The

` wheel 32.

pin 43 of the right hand lever 39, however, is seen to be-Qin engagement with the appropriate parts of the rack levers 27, 2 8, so that these levers are spread. .and their `rack teeth fail to mesh with `the ratchet Whilst either vof therspools retans any coils of ribbon, the lever .arms 36 are prevented from projecting by such coils spool, the motionl 17, each of thelever's- 39 having been in e ribbon until the latter spoo'lvis empty when the reversal takes place as ends of' a rod 41.'slidably mounted within the bore enlargements of the any hindrance vto the' free swinging and working ofthe parts. l As soon as the right hand spool becomes empty its lever arm 36 is free to move out through the slot as above and lever 39. This effects an arrest of the right hand vlever 39 in its swinging motion which hasup till this moment been in consonance with .the swing of the leversv 12 and fixedV Vso that the, pins 33 cannot drop andcause `described and the pin 33 drops so that its Hro]ect1onA 42 .enters the slot 37 of Athe right' angular relation to the appropriate lever 12 or. 17, owing tothe factV that there has been nothing to dlsturb this relative positioning of the levers; As soon as the right handl lever 39 is arrested, however, the-relationis upset for the levers 12 and 17 continue to swing under the actionof the driving means 'I above described.` Thus, the rodil will be moved over the rod 41, the enlargements of the rack levers 21 and 22 will be forcibly brought a lever 39

vv levers

27 and 28 will be moved away from the pin 43 of the right hand lever 39. The result will be that the

levers

21 and 22 will ainst the pin l43 of the left hand be spread to the position seen in Figure 2 so that theirl racksno longer mesh with the ratchet wheel 26, whereas the levers 27 ald y 28 will be drawn towards ,one another ilst the enlargements of the rack 'A i their spring so that.. they will mesh with theratchet wheel 32 *The right hand spool will now-wind on ribbon whilst ribbonr'will be freely unwound from the left hand spool.

Immediately the lever arm 36 of the right handspool isilapped by the ribbon it will be forced back through its slot and will.lift

its pin 33' and re ease `the latter from the slot f3.7 of the right hand lever 39, the parts being now free to swing and feed ribbon onto the right hand spool until the latter is. full and the left hand spool is'empty,4 as will be readily understood. I r l The direction of winding and the reversal are lindicated bya pin 44 onthe jecting through a slot 45 -in the rod 16. As

-will be seen by comparing 4Figures 1 and 2,

' the pin 44 lies to the left hand end of the slot 1 45 lwhen the left handv spool is win 'nge on and to the right hand end of the slot 45 when the right hand s ool'is winding on..

Having thus escribedmy invention whatl Iclairnisz W Q 'i 1. Reversible ribbon feeding mechanism for typewriting and like machines, comprising a ribbonv spool, a pin Vaxially slidable' in said- I spool, means permitting the pinv .to dro when the ribbon is unwound from the spoo a reciprocating rod, :drive gearing.v for'said spool including feed levers pivoted to Vsaid drive lever, and

means controlled by the dropping of said pin for throwing said drive gearing in'to gear,

12s a drive leverdriven by said, I l reciprocating vrod and a pa1r of tong-likel said means including an oscillating reversing lever having a slot adapted to receive sai pin whereby the oscillation of said reversing lever is limited, and a second reciprocat- 5 ing rod adapted to actuate said reversing lever. r

2. Mechanism as specified in claim 1, wherein the drive lever and the oscillating lever are mounted on a common pivot.

3. Mechanism as specied in claim 1, wherein the second reciprocating-rod is slidably mounted within the first mentioned reciprocating rod.

4. Mechanism as specified in claim 1, wherein the drive lever and the oscillating lever are mounted on a common pivot, an

the second reciprocating rod is slidablymounted within the vfirst mentioned recip- J rocating rod. Y

In testimony whereof I afix my signature.

' eo'rTLoB AICHELE.