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Publication numberUS1067664 A
Publication typeGrant
Publication dateJul 15, 1913
Filing dateJun 22, 1912
Priority dateJun 22, 1912
Publication numberUS 1067664 A, US 1067664A, US-A-1067664, US1067664 A, US1067664A
InventorsAlfred G F Kurowski
Original AssigneeUnderwood Typewriter Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Type-writing machine.
US 1067664 A
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Description  (OCR text may contain errors)


Patented July 15, 1913.


WITNESSES: 65%;M M 12645151 AT;,TOR EY chines, when the ALFRED G. r. KUROWSKI, 0F BROOKLYN, NEW 'TYPEWBITER COMPANY, or nnw YORK, N. Y.,


Specification of Letters Patent.

YORK, Assmnon To unnnnwoon a CORPORATION Oil-DELAWARE.

Application filed June 22, 1912. Serial N 0. 705,166.

To all whom it may concern:

Bait known that I, AL-rnEnGr. F. KU- ROWSKI, a citizen of the United States, residing in Brooklyn borough, in the county of Kings and State of New York, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

This invention relates to the. ribbon mechanism of typewriting machines.

In the usual forms of 'typewriting maplaten is' shifted to the upper case, the portion of the ribbon which covers the printing point is shifted so as to preserve its proper position relatively to the platen, the ribbon being paid out from the suppl spool during the shifting. The result i that when the carriage-returns to the lower case there is a certain amount of slack in the ribbon which is liable to smudge the paper, and prove otherwise. objectionable.

The object of this invention is to overcome I this difficulty, and tothis end I connect to the lift rail frame a pawl which engages the ribbon-winding ratchet. Then the lift rail frame is shifted for upper case, the pawl rides freely over the ratchet teeth, and, when w the frame is returned to lower case, the pawl is a View similar to Fig. 1,

engages the ratchet so as to give it a partial turn which is sufiicient to remove the slack created in the ribbon by .the shift for upper case.

In the accompanying drawings, Figure 1 is. an elevation view illustrating diagram matically an Underwood writing machine with my invention applied thereto. Fig. 2 illustrating the carriage and ribbon shifted to the upper case, and in position to receive the type impression. Fig. 3 is a perspective detail, illustrating the pawl and its connection to the lift rail frame. Fig. 4 is a detail illustrating the shifting of the ribbon.

The case shift key 1 has an arm 2 engaging the lift rail frame 3, which carries the lift rail 4 adapted to shift the platen to the upper case by engaging a roller 5 mounted on. a bracket; 6 fixed to the platen frame 7. The ribbonjfi is wound on spools 9, which are rotated 11y the ribbon feed ratchet 22 and intermedialeggearing to feed the ribbon.

" Thvratchet 22 is given a step-by-step rotation during the letter feed by the pawls- 22' (Fig. 2 usual mechanism. The ri of the carriage actuated by the ban is guided by a ribbon guide or vibrator 10 connected to'a lever 11 fulcrumed on a bracket 12 fixed to the lift rail. \Vhen the raseshift. key is depressed to shift the lift 1- case the latter also lifts th brator to elevate the ribbon.

key"is-depressed, a type bar l3 frame l6; which, through,bracket'li, ates the lever 11 and vibrator 10 to further move the ribbon into position to cover the Patented any is, 1913.

ail to the upper. ever. , lvhenatype with its; heel 14, engages the universal b51115 to shift the printing point. As illustrated in Figs. 2

and 4 this total movement of the ribbon is considerable, which ribbon guide when the plat to thelower case. To tak producesa slack atthe; ramereturns tins-slack as pins 20 fixed to acentto the ribbon feed ratchet 22. Mounted on the slide 19, is a pawl 23 engaging the ratchet 22. This pawl may be formed with afprojection 24; engaging the lower surface 0 chine frame, which limits the upward movement of the pawl and avoids the possibility of its being thrown out of position should the ratchet accidentally be shifted laterally too far. A spring 25 mounted on the slide holds the pawl yieldingly against the teeth of the ratchet. When the carriage is shifted to the upper case, the pawl is moved forward and rides freely over the ratchet teeth, while when the carriage is returned the pawl gives the ratchet a partial rotation which takes up all the'slack that has been formed. Many variations may be resorted to with- 1n tion shown.

Having thus described my invention, I claim:

1. In a typewriting machine, the combination of a shiftable carriage, ribbon mechanism, and means for taking up the slack formed in the ribbon when the carriage is shifted to the upper case.

2. In a typewritin machine, a ribbon feed ratchet, case-shi ting mechanism, and means for operating the ratchet from the case-shifting mechanism.

3. In a typewriting machine. a case shift a flange 24 (Fig. 3) formed on the ma-' the scope of this invention. I do not deg sire to be limited therefore to the construe key, a lift rail frame operated thereby, a no ribbon feed ratchet and means for Operating said ratchet from the lift rail frame.

4. In a typewriting machine, case shifting mechanism, ribbon actuating mechanism, and means for operating said ribbon actuata ing mechanism from the case-shifting mechanism. v a

5. In altypewriting machine, a ribbon feed ratchet, a lift rail frame, a link connected thereto, a slide connected to the link,

and a pawl mounted on the slide engaging the ratchet. v

6. In a typewriting machine, a ribbon feed ratchet, a lift rail frame, a link connectedthereto a slide connected to the link, a pawl mounted on the slide engaging the ratchet, and a projection on the pawl for limiting the lateral movement thereof.

7. In a typewriting machine, a ribbon feed ratchet, a lift rail frame, a link con nected thereto,a slide connected to the link,

a pawl mounted on the slide engaging the ratchet, and a" spring for'yieldingly holding the pawl in engagement with the ratchet.

8. In & typ writing machine, a ribbon feed ratchet, a. lift rail frame, a. link connected thereto,=a slide connected to the link,

a pawl mounted'on' tlie'slide engaging the ratchet, a projection on the-'pawl, and a flange on the mach-me frame extendlng over said projection.

Copies of this patent may-be obtained for creasing the length of ribbon between the spools and vibrator when the platen is shifted to upper case position, and means to automatically take upthe slack in the ribbon.

asthe platen is lowered.

11. In a typewriting. machine, the combination with a shiftable traveling carriage, of

a ribbon vibrator shiftable with the carriage,

a ribbon spool, ainibbon feed ratchet geared to the spool, mechanism to rotate said ratchet during the letter feed travel of. the carriage, a pawl for said ratchet, and means to operate saidpawl when thecarriageis returned from shifted position, and thereby take up slack in the ribbon.

ALFRED G. F. .KU'ROWSKI. Witnesses:

J. AL-Bnornr, v g F. E. ALEXANDER.

five cents each, by addressing the Commissioner of Patents, Washington, D. G.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4140407 *Aug 18, 1977Feb 20, 1979Scm CorporationRibbon feed mechanism responsive to case shaft mechanism and printing mechanism
U.S. Classification400/215, 400/236.1, 400/266, 400/236.2, 400/234
Cooperative ClassificationB41J35/04