US2156418A - Noiseless return for typewriter carriages - Google Patents

Noiseless return for typewriter carriages Download PDF

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Publication number
US2156418A
US2156418A US200007A US20000738A US2156418A US 2156418 A US2156418 A US 2156418A US 200007 A US200007 A US 200007A US 20000738 A US20000738 A US 20000738A US 2156418 A US2156418 A US 2156418A
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US
United States
Prior art keywords
ratchet
tooth
ratchet wheel
ratchet tooth
carriage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US200007A
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English (en)
Inventor
Wunderlich Friedrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FIRM TRIUMPH WERKE NURNBERG A
Firm Triumph-Werke Nurnberg A-G
Original Assignee
FIRM TRIUMPH WERKE NURNBERG A
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FIRM TRIUMPH WERKE NURNBERG A filed Critical FIRM TRIUMPH WERKE NURNBERG A
Application granted granted Critical
Publication of US2156418A publication Critical patent/US2156418A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/66—Carriage-release mechanisms

Definitions

  • This invention relates to a noiseless return for typewriter carriages.
  • Various attempts have already been made to solve this problem, but the suggestions hitherto madehave not led to a completely satisfactory result.
  • ' 'I'hus for example it has been proposed to open out by frictional action, by means of a bell-crank levera divided coupling or sleeve which is provided in the joint with teeth.
  • the disadvantage of this appliance consists in the fact that the teeth can only en-U gage intermittently or in jerks'and that means would furthermore have to be provided for locking, which occasion a great deal of noise.
  • the object of the present invention is to provide a. completely noiseless carriage return, which will ensure a reliable disengagement of the ratchet tooth, and. this object is attained by effecting the disengagement of a divided ratchet 30 tooth under the action of the weight of the ratchet tooth or of a supplementary spring, while the engagement thereof is effected through the mediumA of a friction member actuated by the ratchet wheel.
  • 1 35 'I'he invention is illustrated by way of example in the accompanying drawings, in which Figure 41 shofws the feeding or ratchet appliance during the retraction of the carriage;
  • Figure 2 shows the engagement of the ratchet 4,0 tooth
  • Figure 3 shows the feeding or ratchet appliance in the writing position of the carriage
  • I y Figure 4 shows the feeding or ratchet applianrzeduring the striking of a key or of the space aber
  • Figure 5 showlsjav section through the feeding or ratchet body in the writing position
  • Figure 6 shows a section similar to Figure 5, during the actuation of thecarriage release lever M or of a tabulator.
  • ratchet body In the feeding or ratchet body is slidably mounted in a guide bush IS abolt Y4, which carries at one end a ratchet tooth carrier On this carrier a loose ratchet tooth @is ro-A 1, which-1s rock-'- ably supported between conical points 2 ⁇ and 3,.
  • ratchet tooth B (o1. 19V-ss) tatably supported about a bolt 1.
  • the travel of the loose ratchet tooth B is limited in one direction by a stop 8, and in the other direction by a stop 9.
  • the latter is constructed as an adjustable eccentric.
  • the stop 8 is formed by thin metal sheets II, for-thevpurpose of damping the noise of the impact.
  • On the feeding or ratchet body I is furthermore arranged in a known manner a fixed ratchet tooth I2.
  • The' ratchet tooth carrier 5 is subject to the pressure of-a spring I5,and swings between adjustable stops I3 and I4.
  • a ⁇ tension spring I9 tends to keep the ratchet body I in a definite position, i. e.
  • a bell-crank-lever 1 I is rotatably supported about a bolt ⁇ 20.
  • a tension spring I0 draws the lever arm 23 is pivote'd at 25 an intermediate lever 25B, provided with an abutmentvn'ose 2li.
  • the free end of the kintermediate lever 25,a is pivotally connected at 21 with an arm 21S, which is integ-ral or virtually integral with a friction disc 28 supported upon the pivot 31 of the ratchet wheel.
  • the arm 21n carries an abutment nose'26.
  • a pin 29 which engages in an elongated hole 30 in a. friction shell 3i.
  • a spring cap 33 is mounted in slots32.
  • Compression springs 34 and,35 ensure the rubbing ofthe friction shell 3i, and also of the friction disc 28, on the ratchet wheel 36, which is. mounted fast upon the shaft 31.
  • Positioning rings 38 and 39 vensure the position of the friction disc 38 and of the spring cap 33.
  • the ratchet appliance is sented during lthe return ofthe carriage.
  • the ratchet wheel 36 moves during this operation in the direction -of the'arrow 4I.
  • the arm 21n is thereby carried round in the same*direction-of 'revolution by the action of the friction disc 28 and ⁇ of the friction she'll 3
  • is then rocked kthereby about its fu1crum20 in such a way that the stop 22/ass ⁇ umes the position shown in Figure 1,
  • the ratchet4 tooth carrier 5 is then pressed against repre-I the stop I4, and the loose ratchet tooth 6 bears by its own weight, assisted, it maybe, by a supplementary spring I0, against the eccentrically constructed stop 9.
  • the rounded tip of the ratchet tooth 6 is thus brought out of reach of the teeth of. the ratchet wheel 36, so that the latter can be freely rotated in the direction of the arrow l I, thus avoiding any noise.
  • the ratchet body I is oscillated in its bearings 2 and 3 in the direction of the arrow d2 in Figure 5. Owing to this rocking movement the ratchet tooth carrier 5 and the loose ratchet tooth 6 move in a lateral direction out of reach ofthe teeth of the ratchet wheel 36, at the same time putting in the iixed ratchet .tooth I2.
  • the ratchet tooth carrier 5, under the action of the spring I5 now bears upon the vstop I4, while the loose ratchet tooth 6, by its own weight, or by the action of the supplementaryA -spring ""-I0,' finds its motion limited by the stop 22.
  • This stop has a fixed position, since, as explained above, it is prevented'froni deecting by the,v straight -position of the lever arm 2'Ia and the interme- Upon furtherfeedingdiate'link or lever 25e. s the xed ratchet .tooth I2 is disengaged, and
  • the long bearing of the bolt 4 in the bush I6 enablesthe movable ratchet tooth to have a good seat in every case.
  • a writing machine comprising a frame and a carriage reciprocabie on the frame, the provision of means for the noiseless Ireturn of the carriage, comprising a ratchet wheel rotatably mounted in the frame, a movably mounted ratchet tooth capable of engaging with the ratchet wheel but tending by its own weight to move out of engagement therewith, a movable abutment for moving the said ratchet tooth into vengagement with the ratchet wheel, and actugagement with the ratchet wheel, on the ratchet wheel being turned in the normal carriage-feed direction and moving the abutment in the opposite direction, on the ratchet Wheel being turned inthe reverse direction, so as to allow the ratchet tooth to pass out of engagement with the ratchet wheelunder its own weight.
  • means for-the noiseless return of the carriage comprising a ratchet wheel rotatably mounted in the frame, a movably mounted ratchet tooth, capable of engaging with the ratchet wheel but tending by its own weight to move out of engagement therewith, spring means assisting the disengagement of the ratchet tooth from the ratchet wheel, a movable abutment for moving the said ratchet tooth into engagement with the ratchet wheel.
  • actuating means including friction driving means, operatively connected to the abutment and to the ratchet wheel, for moving the abutment in the direction to bring the ratchet tooth into engagement with the ratchet wheel, on the ratchet wheel'being turned in the normal carriage-feed direction and moving the abutment in the opposite direction, on theratchet wheel being turned in the reverse direction, so as to allow the ratchet tooth 'to pass out of engagement with the ratchet wheel under its own weight wit the assistance of said spring.
  • a writing machine comprising a frame and a carriage reciprocable on the frame, the provision of means for the noiseless return of the carriage, comprising a ratchet wheel rotatably mounted in the frame, a ratchet tooth carrier,
  • a ratchet tooth pivotally mounted on the ratchet tooth carrier, the said ratchet tooth being capable of engaging with theratchet wheel but tending by its own weight to move out of engagement therewith, a movable abutment for moving the said ratchet .tooth into engagement with the ratchet wheel, and actuating means,
  • friction Adriving means operatively connected to the' abutment and,to the ratchet wheel, for moving the abutment in the direction to bring the ratchet tooth into engagement with the ratchet wheel, on the ratchet Wheel being turned in the normal carriage-feed direction and moving the abutment in the opposite direction.
  • a writing machine comprising a. frame and a carriage reciprocable on the frame, the provision of means for the noiseless return of the carriage, comprising a shaft 'rotatably mounted in the frame, Va ratchet wheel mounted fast on the shaft, a movablymounted ratchet tooth capable of engaging with the ratchet wheel but tending by its own weight to move out of engagement therewith, a friction member mounted loose on the shaft, an arm rigid with the friction member, a bell crank lever pivotally mounted on the machine frame, an intermediate link connecting the bell crank lever to the arm of the friction member, a movable abutment adjustablysecured to the bell crank lever and capable of -moving the movable ratchet tooth into engagement with 4the ratchet wheel.
  • a stop on the intermediate link for limiting its movement, a friction shell surrounding the friction member, and springs urging the friction shell into frictional engagement with the ratchet wheel.
  • means for the noiseless return of the carriage comprising a shaft rotatably mounted in the frame, a ratchet wheel mounted fast on the shaft, a movably mounted ratchet tooth capable of engaging with the ratchet wheel, but tending byits own weight vto move out of engagement therewith, a friction member Ymounted lose on the shaft, an arm rigid with the friction member, a bell crank lever pivotally mounted on ⁇ the machine frame, an intermediate link pivoted atone end to the arm of the Afriction member and at the other end to one arm of the bell crank lever, a movable abutment adjustably secured to the other arm of the bell crank lever and capable of moving the movable ratchet tooth into engagement with the ratchet wheel, means for producing frictional engagement between the friction member and the ratchet wheel, a stop on the arm of the friction member, this stop bearing against the intermediate link-When the movable ratchet tooth comes into engagement With the yratchet wheel and when the pivotal axis
  • a writing machine comprising a frame' and a carriage reciprocable on the frame
  • the provision ofl means for the noiseless return of the carriage, ⁇ comprising a feeding body rockably mounted on the writing machine frame, a bearing bush secured to the feeding body, a.
  • a writing machine comprising a vframe and a carriage reciprocable on the frame
  • means for the noiseless return of the carriage comprising a feeding body rockably mounted on the writing machine frame, a bearing bush -secured to the feeding body, a pivot slidable in the bearing bush, a ratchet wheel rotatably'mounted in the writing machine frame, a ratchetv tooth carrierY oscillatably mounted on the said slidable pivot, a ratchet tooth pivotally mounted on the ratchet tooth carrier, the said ratchet tooth being capable of engaging with the ratchet wheel but tending 'by its own weight to move out of engagement therewith, a friction member mounted loose on the shaft,V an arm rigid with the frictionmember, a bell crank lever pivotally mounted on the machine frame, an intermediate link connecting the bell crank lever to the arm of the friction member, a movable abutment adjustably secured to the bell crank lever and capable of moving the movable ratchet tooth into engagement with the

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US200007A 1937-05-27 1938-04-04 Noiseless return for typewriter carriages Expired - Lifetime US2156418A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE206199X 1937-05-27

Publications (1)

Publication Number Publication Date
US2156418A true US2156418A (en) 1939-05-02

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ID=5791203

Family Applications (1)

Application Number Title Priority Date Filing Date
US200007A Expired - Lifetime US2156418A (en) 1937-05-27 1938-04-04 Noiseless return for typewriter carriages

Country Status (4)

Country Link
US (1) US2156418A (fr)
CH (2) CH206199A (fr)
FR (2) FR835277A (fr)
GB (1) GB496447A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2484198A (en) * 1945-12-13 1949-10-11 Emerson Electric Mfg Co Noiseless escapement mechanism
US2913091A (en) * 1955-12-23 1959-11-17 Neumann Erich Noiseless escapement mechanism for typewriting machines
US3752289A (en) * 1969-12-31 1973-08-14 Triumph Werke Nuernberg Ag Typewriter escapement and control devices therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2484198A (en) * 1945-12-13 1949-10-11 Emerson Electric Mfg Co Noiseless escapement mechanism
US2913091A (en) * 1955-12-23 1959-11-17 Neumann Erich Noiseless escapement mechanism for typewriting machines
US3752289A (en) * 1969-12-31 1973-08-14 Triumph Werke Nuernberg Ag Typewriter escapement and control devices therefor

Also Published As

Publication number Publication date
FR835277A (fr) 1938-12-16
CH231656A (de) 1944-03-31
GB496447A (en) 1938-11-30
FR52123E (fr) 1943-08-17
CH206199A (de) 1939-07-31

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