US2551234A - Escapement mechanism for typewriters - Google Patents

Escapement mechanism for typewriters Download PDF

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Publication number
US2551234A
US2551234A US745548A US74554847A US2551234A US 2551234 A US2551234 A US 2551234A US 745548 A US745548 A US 745548A US 74554847 A US74554847 A US 74554847A US 2551234 A US2551234 A US 2551234A
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US
United States
Prior art keywords
catch
wheel
spindle
escapement
detent
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
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US745548A
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English (en)
Inventor
Balzeau Charles
Mousset Rene
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ETS JAPY FRERES SOC
Ets JAPY FRERES Ste
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ETS JAPY FRERES SOC
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Application filed by ETS JAPY FRERES SOC filed Critical ETS JAPY FRERES SOC
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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
    • B41J19/34—Escapement-feed character-spacing mechanisms

Definitions

  • Our invention has for its object an improved escapement mechanism for typewriters, said mechanism being specially designed in order that the shifting of the carriage of the typewriter after a key has been depressed, may be efiected in a single stage so as to provide for a high degree of accuracy in the typing whatever may be the speed of typing.
  • Such a mechanism cooperates with the wellknown arrangement wherein a traction band constantly urges the carriage forward together with a rack rigid therewith and thus constrains the escapement wheel to rotate through the agency of a pinion keyed to the axis of said wheel and in permanent mesh with the rack.
  • This general arrangement is common to all typewriters and varies only as concerns the position of the escapement wheel that lies in a horizontal plane in certain cases and in a vertical plane in other cases.
  • Fig. 1 shows in the case of the horizontal escapement the whole of the mechanism in perspective view.
  • Figs. 2, 2a, 2b, and 2c are plan views of said mechanism illustrating four successive positions of the escapement period, while the carriage is moving through the interval corresponding to the space between two successive impressions.
  • Figs. 3A, 3B, and 3C are detail views.
  • Figs. 4, 5, and 6 show respectively in elevational, plan and side view a mechanism that is applicable for the case of a vertical escapement wheel.
  • Figs. 4a, 4b, and 4c are elevational views illustrating in association with Fig. 4, four successive positions of the escapement during an escapement period.
  • Fig. 6a is another side view corresponding to the position illustrated in elevational view in Fig. 4a.
  • the vertical spindle I of the mechanism is pivotally mounted at both ends and carries at its lower end a transverse bar 2 secured rigidly to it and provided with an adjusting screw 3; this bar may be rocked horizontally in the direction of the arrow ;f and its stroke is defined at the start by a stop 4; said bar provides for the control of the rotation of the support of the catches I and I3 described hereinafter.
  • the spindle I is constantly urged back into its inoperative posi.
  • the escapement wheel is held in its inoperative position by a catch 1 adapted to rock with reference to the axis of spindle I or an axis alined therewith; the tip 8 of said catch engages the teeth of the wheel R under the action of a spring 9 secured to the spindle I, for instance through the agency of the screw Iii, the engagement between the catch and the wheel being limited by an adjustable stop II.
  • the limitation of said engagement between the catch and the teeth of the wheel may also be obtained as shown by way of example in Fig.
  • a member I2 secured to the upper part of the spindle I for instance through the agency of the spring-engaging screw 6, carries the detent I3 adapted to rock round the securing screw I4, that serves also as an axis for p the spring I5; the latter acts on the abutment stud I6 rigid with the detent and constantly urges the latter into its inoperative position, i. e. that illustrated in Fig. 2, wherein the detent I3 bears against the catch 1.
  • the detent is shaped so as to provide at its point of contact with the catch a notch for housing the tail-piece I1 of the catch.
  • the universal bar acts, through the agency of a combination of suitable members that from no part of our invention, on the adjusting screw 3 on the small bar 2 so as to urge the latter in the direction of the arrow f whereby the spindle I is caused to rock.
  • the detent that is in contact with the tail-piece ll of the catch 1 drives the latter away from the stop H and releases the tip 8 of the catch with reference to the tooth d4 of the wheel R with which it was precedingly engaged.
  • the catch 1 With reference to the typewriter as a whole, the catch 1 has thus resumed its original position and is again in the position shown in Fig. 2. At this moment the rearward motion of the universal bar discontinues the thrust that has been exerted on the small bar 2 in the direction of the arrow and the spindle l subjected to the action of the return spring 5 pivots in the opposite direction, which releases the detent 13 with reference to the teeth of the escapement wheel and returns the mechanism as a whole into the inoperative position illustrated in Fig. 2.
  • Figs. 4-4c, 5, 6 and 6a relateto a mechanism that is applicable for the case of a vertical escapement wheel.
  • the spindle la of the mechanism is horizontal and remains stationary; it serves as a pivot'for a support l8- to which is pivoted a catch 1a held fast by a screw [9 that serves as an axis for a hair-pin shaped spring 20 through which the catch is urged against the stationary stop 2 I.
  • This arrangement of a rotary catch 1a is necessary only for allowing the reverse rotation of the ratchet wheel R. in the case of the carriage being returned back through one space or being returned into its starting position.
  • This member 24 is shaped in a manner such as to include an arm 26 which is of a special shape and passes inside a suitable notch 21 provided in the catch support I8; said member terminates at. its upper end in a projection I 3a playing the part of the detent of, the precedingmechanism.
  • the member 24. swivels round the spindle l a under the action of the controlling rod.28 and through the particular arrangement of the arm 26 it may carry the. support I8 along; in its rotary movement. When inoperative, it bears against the adjustable stop 29 under the action of its radial return spring 30.
  • the control rod 28 is urged forwards and pushes the driving member with which it is in contact so as to make it rotate angularly or to rock round the spindle la; this movement is immediately transmitted as disclosed to-the supporting member l8 and consequently to the catch la.
  • This rocking of the mechanism as a whole serves to simultaneously release the catch with reference to the teeth of the wheel R and to engage the detent projection 13a between said teeth; this position is illustrated in Figs. 4a and 6a.
  • the driving member 24 the projection l3a of which is thus engaged with the escapement wheel that is now capable of rotating, slides over the spindle la while compressing the axial spring 25 and then releases the support 13 which is urged by the return spring 23 and constrains the catch to bear against the side of the teeth of the wheel R as apparent from Fig. 4b; as soon as under the action of the continuation of the rotation of the Wheel R the catch may drop into the hollow of the next tooth as illustrated in Fig. 4c, the support I8 returns into its inoperative position and bears against the stop 22.
  • the control rod 28 returns backwards and the drivin member 24 subjected to the action of 'its radial return spring 30 may then laterally disengage the projection l3a with reference to the teeth of the wheel and bear against the stop 29; at the same time the axial return spring 25 expands and returns the member 24 into its original inoperative position.
  • the mechanism is thus set and is ready for a further escapement operation.
  • An escapement mechanism for typewriters comprising an escapement wheel, a catch adapted to engage the teeth of said escapement wheel, a spring urging said catch into engagement with the wheel, a pivoting detent engaging said catch, a control bar adapted to make said detent rock for releasing the catch with reference to the Wheel and engaging in its turn the wheel, to then be driven along by thewheel for disengaging the catch and allowing same to reengage the wheel teeth, a spring acting in antagonism with the movement of the escapement Wheel urging the detent into engagement with the catch, and a spring acting in antagonism with the control barfor returning the detent back into its inoperative position.
  • An escapement mechanism for typewriters comprising a horizontal escapement wheel, a pivoting vertical spindle, a control bar rigid therewith, a stationary stop, a spring urging the control bar against its stop, a catch adapted. to pivot round said spindle, a spring urging the catch into engagement with the teeth of the escapement wheel, a detent engaging said. catch, a member rigid with the spindle-forming a. sup- 5 portin pivot for the detent and a spring urging the detent into contact with the catch.
  • An escapement mechanism for typewriters comprising a horizontal escapement wheel, a pivoting vertical spindle, a control bar rigid therewith, a stationary stop, a spring urging the control bar against its stop, a catch adapted to pivot round said spindle, a spring urging the catch into en agement with the teeth of the escapement wheel, a detent engaging said catch, an adjustable stop limiting the stroke of the catch at the point corresponding to engagement of its outer end with the bottom of the interval between two teeth of the wheel, a member rigid with the spindle formin a supporting pivot for the detent and a spring urging the detent into contact with the catch.
  • An escapement mechanism for typewriters comprising a horizontal escapement wheel, a pivoting vertical spindle, a control bar rigid therewith, a stationary stop, a spring urging the control bar against its stop, a catch adapted to pivot round said spindle, a spring urging the catch into engagement with the teeth of the escapement wheel, a detent engaging said catch, an adjustable stop limiting the stroke of the catch at the point corresponding to engagement of its outer end with the outer parts of the teeth of the wheel, a member rigid with the spindle forming a supporting pivot for the detent and a spring urging the detent into contact with the catch.
  • An escapement mechanism for typewriters comprising a horizontal escapement wheel, a pivoting vertical spindle, a control bar rigid therewith, a stationary stop, a spring urging the control bar against its stop, a catch adapted to pivot round said spindle, a spring urging the catch into engagement with the teeth of the escapement wheel, a detent engaging said catch, a disc rigid with and coaxial with the escapement wheel and adapted to engage through its periphery the outer end of the catch, the radius of said disc being comprised between the maximum and minimum radii of the escapement wheel, a member rigid with the spindle forming a supporting pivot for the detent and a spring urging the detent into contact with the catch.
  • An escapement mechanism for typewriters comprising a vertical escapement wheel, a horizontal stationary spindle, two members adapted to rotate side by side on said spindle, of which one is recessed and the other is adapted to slide over the spindle, adjustable stationary stops, springs urging each of said members against the corresponding stop, a catch carried by the first member and adapted to engage the wheel in a predetermined angular position of the first mem- -ber with reference to the spindle, an arm rigid with the second member and adapted to engage the recess in the first member, a, detent on said arm adapted to engage the wheel in a predetermined angular position of the second member with reference to the spindle, the rotation of the wheel when engaged by the detent releasing the two members with reference to one another, an axial spring urging the second member towards the first member and means for controlling the angular position of the second member.
  • An escapement mechanism for typewriters comprising a vertical escapement wheel, a horizontal stationary spindle, two members adapted to rotate side by side on said spindle, of which one is recessed and the other is adapted to slide over the spindle, adjustable stationary stops, springs urging each of said members against the corresponding stop, a threaded spindle carried by the first member, a catch pivotally mounted on said spindle, a folded spring, a stationary stop on the first member against which the catch is urged by the last-mentioned spring, said catch being adapted to engage the wheel in a predetermined angular position of the first member with reference to the spindle, an arm rigid with the second member and adapted to engage the recess in the first member, a detent on said arm adapted to engage the wheel in a predetermined angular position of the second member with reference to the spindle, the rotation of the wheel when engaged by the detent releasing the two members with reference to one another, an axial spring urging the second member towards the first member

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US745548A 1946-05-22 1947-05-02 Escapement mechanism for typewriters Expired - Lifetime US2551234A (en)

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FR2551234X 1946-05-22

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US2551234A true US2551234A (en) 1951-05-01

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FR (1) FR957069A (is")

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1121630B (de) * 1957-12-05 1962-01-11 Olivetti & Co Spa Schaltschritteinrichtung fuer das Zeilenausschliessen an Schreib- oder dergleichen Maschinen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US923106A (en) * 1905-08-16 1909-05-25 Monarch Typewriter Co Type-writing machine.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US923106A (en) * 1905-08-16 1909-05-25 Monarch Typewriter Co Type-writing machine.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1121630B (de) * 1957-12-05 1962-01-11 Olivetti & Co Spa Schaltschritteinrichtung fuer das Zeilenausschliessen an Schreib- oder dergleichen Maschinen

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Publication number Publication date
FR957069A (is") 1950-02-14

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