US2351837A - Escapement mechanism for typewriters - Google Patents

Escapement mechanism for typewriters Download PDF

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Publication number
US2351837A
US2351837A US405875A US40587541A US2351837A US 2351837 A US2351837 A US 2351837A US 405875 A US405875 A US 405875A US 40587541 A US40587541 A US 40587541A US 2351837 A US2351837 A US 2351837A
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US
United States
Prior art keywords
pawl
escapement
frame
retaining
teeth
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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
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US405875A
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English (en)
Inventor
Prezioso Giuseppe
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.)
E Paillard Et Cie S A
Paillard Et Cie S A E
Original Assignee
Paillard Et Cie S A E
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Filing date
Publication date
Application filed by Paillard Et Cie S A E filed Critical Paillard Et Cie S A E
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Publication of US2351837A publication Critical patent/US2351837A/en
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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

Definitions

  • Known escapement mechanisms for typeWrit-"f ling, adding and similar machines generally comprise a pinion which meshes with the rack fitted on the carriage, said pinion being secured'to a shaft and actuating a ratchet Wheel Which coolperates with retaining and'escapement'pawls.
  • the present inventionV hasfor its primaryobject to provide an improved escapementl mechanism fortypewriting, adding and other' similar machines, Said mechanism being adaptedfto obvlate the' aforesaid disadvantages while satisfying all practicalY requirements iand ensuring ai great operationalsimplification andproper touchsaiety over a widerange' of typewriting speeds.
  • Another object,v of" the 'inventionis to provide an improved escapementmech'anisinior typewriting and similar machinesfthe elements of vwhich are Vso arranged as to provide proper clearance.
  • Will-appear hereafterjthe invention'y comprises vthe novel construction, disposition'and combination of elements that now ,be described in detaiLwith reference tothe accompanying drawirgj'showing b'yiwaiyof "example inperspective a suitablel constructional y,form fofA the' improved escapemeiitmehenm-@applied t0 a typewritn
  • b'yiwaiyof example inperspective a suitablel constructional y,form fofA the' improved escapemeiitmehenm-@applied t0 a typewritn
  • the inventionfhavegbeen'shown vthe other known elementsgbeing obvious to thoseskilled in the art.
  • the frame 6 comprises a further bearin'" ⁇ g. ⁇
  • the second ratchet Wheel 4 has spur gearing and cooperates with a retaining pawl 8 pivoted on a stud 9 mounted on armember. I'0.slidably received in recesses I I formedin -the'rame6-- The retaining pawl 8 is urged by a-fs'pring l2 fixed thereto at one end and attached at its other end to the sliding member fIfILySaid spring tends to push the retaining pawl Sinto engagement with the second ratchet iwhe'el4.
  • the sliding member I0 is urged by a tension spring 5 in a direction to the right asviewed in the drawing'.-
  • the stroke of themember I0 is .limited bythe fact that its end I3 urged by the spring 5 contacts pivoted stops 44, 45 or the face 5I of a block 85 onwhich are pivoted said stops. Swinging of stops 44, 45 into or out of the sliding path of sliding member ,I0 may be directly controlled, or controlled by the depression of1a key or. through a .universal bar.
  • rIhe stops 44, 45 are held in the position as shown in the drawing by springs v44a,.45a, and are voperated by traction rods 44h, 45h.
  • the end ⁇ face VI3of the sliding member IU may be lined with ⁇ a resi-lient or sound-absorbing substance.
  • v f n c n The retaining pawl L8 is provided withjan operating member which comprises a *stud I4 adapted, when a key :ls ⁇ depressed, toengage an arm I 5 secured to an-auxilia-ry shaft I6 arranged parallel to the sliding member I8.
  • the auxiliary'.V shaft I6 has rigidly fixed thereto the following 'auxiliary shaft I6 'is vsubjectedim 'the torsional urging of a helical spring I9 ⁇ 'the tendency of which is, on the one hand, to 'constantly hold the roller II in contact with'th'e main 'universal bar and, on the other handgto keep the dog I8 clear vof the first ratchetwheel.
  • the auxiliary shaft I8 pivots on adjustable headstocks 20 housed in suitable recesses of 'the frame '6.
  • the dog of the escapement pawl I8 Vis mounted on the 4block Ilia through the intermediary of a piece of noise-reducing material [6b.
  • the movement of the sliding ⁇ 'irrieir'iber IIJ is limited in one direction by a diskv I3a ⁇ of Anoise-reducing material xed on its extremity and being supported on a. n-xed part, and limited inl the ether direction by a piece I3l of noise-reducing material covering its ektremity and being vsupported on one ofv the stops, 44, 45, or Athe block 5I.
  • the dog l8 4 may 'also be pivoted at 3l on the side faces of the frame 6 is actuated by a lever adapted to unlock the carriage (not shown) and acts through the medium of levers32, 33, on the retaining pawl 8 against the action of the spring I2 to disengage the retaining pawl 8 from the'secondratchet wheel 4.
  • the lever 33 is pulled back toits position of rest by a spring 61.
  • each tongue 35 has a nose 40 adapted to engage and actuate a tabulator universal bar 31 having a yoke shape and pivoted on pintle 38 on both side faces of the frame 6.
  • the tabulator universal bar 3'I actuates the following members, namely: i
  • a brake constituted by a pair of shoes 4I which clamp between them a stub shaft 42 secured to a toothed. Wheel 34.
  • the operation of this brake is eifected under the control of the tabulator universal bar 3'I by kbringing the toothed wheel 34 into engagement with an annular gear 39 secured to the shaft 2.
  • a return spring 69 urges the .brake-carrier 'I0 intocontact with a portion of the tabulator universal bar3I.
  • the control :of these several-mem bers by the tabulator universal bar l3'I may be Iarranged to suit requirements in a Wayfdifferent from the one described.
  • the brake may be controlled through the medium lof the spring 68 with aviewto facilitating adjustments.
  • f- The rear face of the frame 6 is provided, 'moreover with controls for'proper positioning and spacing of these stops-*Which are supported by the carriage vand are adapted to engage with ⁇ the tongues 35 of the decimal tabulator.
  • the control for positioningthe stops is performed by means of a finger-shaped member 46 pivoted lat 8
  • the finger 46 pushes the :stopin front of which it is into operative position;
  • the control of the withdrawal vof the stopsisen- 'sured by a stud 48 also pivoted at 8l andfad'a'pted to bring back the stopsl to their inoperative ,poe sition.
  • the stud 48 is actuated from a keyjp'f the keyboard through themedium Vof a bar *"(not shown) pivotally connected at 82. 1 j.) f
  • a groove 54 is formed in said ratchet WheelJ ⁇ 4 ⁇ .
  • said groove is 'received 'a wire ring 'member 55 elastically clamped 'against its'bottom.
  • O ne end 56 o'f 'this ring member is radially bent .outwardly.
  • the frame' G is lpreferably constituted byk a vblock-structure formed with the ynecessary recesses :for accommodating the several memb-ers mounted thereon and enumerated in the foregoing description.
  • Said block has a wide surface ⁇ 50 formed Withmbores for the securing members -49.
  • elastic lining pl-ates 6I made for example of india rubber
  • this improved escapement mechanism is substanvtially'similar to that o f an escapement mechanism tof knownjconstruction.
  • it preseints very important advantages over the latter.
  • an escapement mechanism built according to the presentlinvention has a more intricate structure than 'an escapement mechanism of known type merely comprising a single ratchet wheel cooperating with a pair of pawls, the present invention involves in fact a great operational simplication.
  • each set of teeth may be so shaped as to conform to the operation of the pawls.
  • the set of teeth of the ratchet wheel cooperating with the escapement pawl has a slanting outline so as to facilitate the release of the pawl which should retain the carriage momentarily only while the type bar is being struck.
  • the teeth of the set cooperating with the retaining pawl have radial and vertical faces on which the pawl cannot slide.
  • Each pawl is pivoted and guided independently of the other pawl, which permits to give them a rugged construction while allowing of an extraordinary rapid and easy adjustment. Moreover, as each pawl has proper clearance and accessibility, its control is very easy and can be achieved for example by means of a mere push rod. This obviates intricate and long mounting or assembling operations.
  • each pawl and the ratchet wheels may be oriented at will, such members may be so arranged as to provide sufficient clearance for lining the abutments with sound-absorbing material and providing them with wide contact suroted, it can be operated'for'itself.
  • each pawl is independently piv- It thus becomes possible to release the retaining pawl with- -out engaging the escapement pawl and to free -the carriage in that way.
  • the pawl 8 engages the following tooth corresponding to the stop 44 or the second tooth corresponding to the stop 45 or, alternatively, the third tooth corresponding to the block face 5
  • the reciprocatory motion of the retaining pawl rod is preferably tangential to the second details of an escapement mechanism according to the invention may be different from those described.
  • the bearings for the shaft 2 may be provided with balls or rollers, and the several members may be arranged on the frame 6 and shaped to suit requirements and to t the particular type of machine to which the mechanism is adaptable.
  • an escapement unit a frame, a pinion shaft rotatably mounted on said frame, a driven pinion keyed on said shaft, an escapement ratchet Wheel having teeth with edges oblique to the radiun thereof, a retaining ratchet wheel having teeth with edges substantially radial, and an escapement pawl and a retaining pawl mounted independently on individual pivots and adapted to respectively engage said teeth of said ratchet wheels, said pawls being so arranged and operated that said escapement pawl normally engages said escapement ratchet wheel before said retaining pawl is released from said retaining ratchet wheel.
  • an escapement unit a frame, a pinion shaft rotatably mounted on said frame, a driven pinion keyed on said shaft, an escapement ratchet wheel having teeth with edges oblique to the radius thereof, a retaining ratchet wheel having teeth with edges substantially radial, a slide member slidably mounted on said frame, a retaining. pawl pivotally mounted on.: said slide member, and an escapement pawl pivotally mounted independently of said retaining pawl, said pawls being adapted to respectively engage said teeth of said ratchet Wheels, said pawls being'so. arranged and operated that said escapement pawl'normally engages said escapement ratchet Wheel .before said .retaining pawl is Vreleased from said retaining ratchet wheel.
  • an escapement unit a frame, a pinion shaft rotatably mounted on said frame, a driven pinion keyed on said shaft, an escapementrratchet Wheel having teeth With edges obliqueto theradius thereof, a retaining ratchet Wheel having teeth with Aedges substantially radial, a slide member ⁇ slidably mounted on said frame, a retaining pawl pivotally mounted on said slide member, an escapement pawl pivotally mounted independently of said .retaining pawl, said pawls being adapted to respectively engage said teeth of said ratchet Wheels, said pawls being so arranged and operated that said escapement pawl normally engages said escapementratchet wheel before said retaining pawl is released from said retaining ratchet Wheel, and a plurality of stop members selectively insertable in the path of travel of said slide member for controllably adjusting the maximum travel thereof. ⁇ v y Y 4.
  • an escapement unit a frame, a pinion shaft rotatably mountedon said frame, a driven pinion keyed onsaid shaft, an escapement ratchet wheel having teeth with edges oblique to the radi- ⁇ us thereof, a retaining ratchet .wheel having teeth capement pawl pivotally mounted independently .of said Vretaining pawl, said pawls .being adapted to respectively engage said teeth of said ratchet Wheels, said pawls-beingso arranged and operated that said escapement ⁇ pawl nonnal, engages said escapement ratchet wheel before said retaining pawl is released from said retaining ratchet wheel, and an auxiliary shaft rotatably mounted parallel to said slide member and carrying means pivotally carrying said escapement pawl.
  • a frame a pinion shaft rotatably mounted on said frame, a, driven pinion keyed on said shaft, an escapement ratchet Wheel having teeth with edges oblique to the radi*- us thereof, a retaining ratchet wheel .having teeth with edges substantially radial, a slide member slidably mounted on said frame, a .retaining pawl pivotally mounted on said slide member, an escapement pawl pivotally mounted independently of said retaining pawl, said pawls being adapted to respectively engage said teeth of said ratchet Wheels, and an auxiliary shaft rotatably mounted parallel to said slide member and carrying means pivotally carrying said escapement pawl, said pinion shaft, said auxiliary shaft, and the pivot which mounts said retaining pawl on said slide, al1 three being mutually perpendicular.

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  • Transmission Devices (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
US405875A 1941-02-06 1941-08-07 Escapement mechanism for typewriters Expired - Lifetime US2351837A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH555272X 1941-02-06

Publications (1)

Publication Number Publication Date
US2351837A true US2351837A (en) 1944-06-20

Family

ID=4519933

Family Applications (1)

Application Number Title Priority Date Filing Date
US405875A Expired - Lifetime US2351837A (en) 1941-02-06 1941-08-07 Escapement mechanism for typewriters

Country Status (4)

Country Link
US (1) US2351837A (de)
CH (1) CH226943A (de)
FR (1) FR888224A (de)
GB (1) GB555272A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941645A (en) * 1958-09-30 1960-06-21 Underwood Corp Varied-feed escapement and adjunct mechanisms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941645A (en) * 1958-09-30 1960-06-21 Underwood Corp Varied-feed escapement and adjunct mechanisms

Also Published As

Publication number Publication date
FR888224A (de) 1943-12-07
CH226943A (fr) 1943-05-15
GB555272A (en) 1943-08-13

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