US3858706A - Tabulating mechanism for a dual pitch escapement - Google Patents

Tabulating mechanism for a dual pitch escapement Download PDF

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Publication number
US3858706A
US3858706A US359129A US35912973A US3858706A US 3858706 A US3858706 A US 3858706A US 359129 A US359129 A US 359129A US 35912973 A US35912973 A US 35912973A US 3858706 A US3858706 A US 3858706A
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US
United States
Prior art keywords
tab
escapement
rack
control member
relative movement
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
US359129A
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English (en)
Inventor
Helmut Gottsmann
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.)
TA Triumph Adler AG
Original Assignee
Triumph Werke Nuernberg AG
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 Triumph Werke Nuernberg AG filed Critical Triumph Werke Nuernberg AG
Application granted granted Critical
Publication of US3858706A publication Critical patent/US3858706A/en
Assigned to TRIUMPH-ADLER AKTIENGESELLSLCHAFT FUR BURO-UND INFORMATIONSTECHNIK reassignment TRIUMPH-ADLER AKTIENGESELLSLCHAFT FUR BURO-UND INFORMATIONSTECHNIK CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE 8/13/80 Assignors: TRIUMPH WERKE NURNBERG AKTIENGESELLSCHAFT
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
    • B41J21/00—Column, tabular or like printing arrangements; Means for centralising short lines
    • B41J21/04—Mechanisms for setting or restoring tabulation stops
    • 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
    • B41J19/20—Positive-feed character-spacing mechanisms
    • B41J19/32—Differential or variable-spacing arrangements

Definitions

  • ABSTRACT A type carriage of a single element typewriter is movable in a letter feed direction under the control of an escapement mechanism having interchangeable escapement racks of different pitches for use with interchangeable print elements having type characters requiring different character spacing.
  • a tabulating mechanism having a character spacing corresponding to only one of the interchangeable escapement racks is useable with the alternate escapement rack by supporting a tab member for movement relative to the movable. carriage and providing a tab control member for imparting an oscillatory movement to the tab member during a tabulating operation so that the tab member will engage set tab stops at positions corresponding to the pitch of the alternate escapement rack.
  • This invention relates to a tabulating mechanism for a typewriter or similar business machine, and more particularly to a tabulating mechanism for a single element typewriter capable of utilizing interchangeable print elements having type characters of different character spacing.
  • a carriage is slidably mounted on a typewriter frame for enabling relative movement between the printing apparatus and a recording medium supported on a suitable platen, and a line of type is printed by moving the carriage in a letter feed direction in incremental steps each corresponding to the size of the type characters being printed.
  • the stepping movement is effected by an escapement mechanism which includes a rack having a series of teeth with a pitch corresponding to the size of the type characters being printed.
  • the typewriter is provided with a tabulating mechanism for disengaging the escapement mechanism and effecting a free sliding movement of the carriage in the letter feed direction to a predetermined position whereupon the movement of the carriage is arrested and returned to the control of the escapement mechanism.
  • the tabulating mechanism includes a tab rack having a plurality of tabs which may be set to stop the carriage during a tabulating operation and each of the tabs represent a position along the line of type corresponding to a tooth of the escapement rack.
  • printing with a single element typewriter may be effected utilizing interchangeable print elements having different type styles, numbers, symbols or combinations thereof.
  • the interchangeable print elements may have type characters of different sizes, for example elite and pica which require character spacing along a line of type of 2.12 mm. and 2.54 mm. respectively.
  • a change of print elements involving a change in character spacing also requires a modification of the escapement mechanism so as to bring into operation an escapement rack having teeth with a pitch corresponding to the character spacing of the print element.
  • Such a modification of the escapement mechanism creates a difference between the character spacing of the escapement mechanism and the character spacing of the tabulating mechanism which may result in tabulating errors.
  • an object of the present invention is to provide a tabulating mechanism having tab stops evenly spaced along a tab rack and operable in conjunction with an escapement mechanism capable of effecting escapement movements corresponding to type characters of different sizes.
  • Another object of the invention is to provide a tabulating mechanism having evenly spaced tab stops corresponding to a particular character spacing and capable of compensating for a difference in pitch with a cooperating escapement mechanism.
  • FIG. 1 is a diagrammatic view of a tabulating mechanism constructed in accordance with the present invention and illustrating in a rest position an escapement mechanism having a pitch corresponding to the type character spacing of the'tabulating mechanism;
  • FIG. 2 is a view similar to FIG. 11 and illustrating the tabulating mechanism undergoing a tabulating operation in conjunction with an escapement rack having a pitch unequal to the character spacing of the tabulating mechanism;
  • FIG. 3 is a view similar to FIG. 2 and illustrating the operation of a tabulating mechanism upon engagement with a settable tab
  • FIG. 4 illustrates diagrammatically the manner in which the tabulating mechanism compensates for the difference between the pitch or character spacing of the tab rack and differently pitched teeth of an escapement rack.
  • an escapement mechanism generally indicated 11, and a tabulating mechanism, generally indicated 13, for controlling the movement of a carriage, generally designated by reference character C, which is mounted on a frame, generally designated by reference character F of a typewriter or similar business machine for slidable movement relative thereto.
  • the carriage C is moved in a letter feed direction under the control of the escapement mechanism 11 which permits the carriage C to move only one character space at a time, while permitting free movement of the carriage C in the opposite direction during a carriage C return operation.
  • the tabulating mechanism 13 is actuated to disengage the escapement mechanism 11 and enable the carriage C to slide freely relative to the typewriter frame F until the predetermined position is reached, whereupon the tabulating mechanism 13 operates to arrest the movement of the carriage C and return it to the control of the escapement mechanism 11.
  • the present invenion will be described in connection with a typewriter having a carriage C for transporting a single print element, it is to be understood that the invention could also be utilized in a typewriter having a reciprocating carriage C for transporting a paper supporting platen.
  • the carriage C and the typewriter frame F as well as other portions of the typewriter are shown only generally since they form no part of the present invention and may be desirably conventional.
  • the escapement mechanism 11 includes a feed pawl 15 which is pivotally supported about a stud 17 associated with the carriage C for engagement with an escapement rack 19 which may be suitably mounted on the frame F of the typewriter.
  • the feed pawl 15 has a tooth 21 for engaging one of a series of evenly spaced teeth 23 formed on the escapement rack 19, and the feed pawl 15 is urged into engagement with the escapement rack 19 by a spring 25 stretched between a projection 27 of the feed pawl and a suitable portion of the typewriter. carriage C.
  • Each of the teeth 23 formed on the escapement rack 19 represents a character space along the line of type, and the distance a between the teeth 23 of the escapement rack 19, hereinafter referred to as the pitch of the escapement rack, corresponds to the size of the type characters on the print element being transported by the carriage C.
  • the escapement mechanism 11 permits the carriage C'to advance in the letter feed direction only one tooth 23 at a time, and no further description of the escapement mechanism 11 is believed necessary since the operation of the escapement mechanism 11 for controlling the movement of the type carriage C relative to the frame F of the typewriter is well-known in the typewriter art.
  • the tabulating mechanism 13 includes a control member 29 in the form of a lever which is movable about the stud 17 associated with the carriage C and carries on one end a tab member 31 for engagement with a plurality of tab stops 33 of a tab rack generally designated by reference character R suitably mounted on the typewriter frame f.
  • the tab stops 33 are equally spaced apart with a spacing a corresponding to that of the escapement rack 19, and each of the tab stops 33 may be set, as shown by the tab stop 33, in a conventional manner for engagement by a blade 35 of the tab member 31 during the tabulating operation.
  • the stud 17 is received in a central elongated opening37 of the control member 29 with one end of the elongated opening 37 normally pressed against the stud 17 by a spring 39 stretched between the control member 29 and a suitable portion of the carriage C for urging the control member 29 in the letter feed direction.
  • the control member 29 has a projecting finger 40 for engaging the feed pawl 15 to disengage the escapement mechanism 11, while a bent ear 41 is formed at the other end for engaging a latching mechanism, generally indicated 43.
  • the latching mechanism 43 includes an L-shaped lever 45 pivotally supported by a stud 46 on the carriage C with one arm 47 engaging the bent car 41 of the control member 29 while the other arm 49 is urged toward a stop abutment 51 by a spring 53 stretched between the arm 49 and a suitable portion of the carriage C.
  • the control member 29 is pivoted from a rest position, as shown in FIG. I, to an operating position, as shown in FIG. 2, to remove the feed pawl 15 from engagement with the escapement rack 19 and enable the carriage C to slide freely in a letter feed direction toward a set tab stop 33'.
  • the pivoting of the control member 29 places the blade 35 of the tab member 31 in a position for engaging the set tab stop 33, and the control member 29 is held in the pivoted position by the latching mechanism 43 which receives the bent ear 41 in a notch 55 formed in the latching lever 45.
  • the control member 29 Upon engagement of the tab blade 35 with the set tab stop 33', the control member 29 is driven against the urging of the spring 39 until the opposite end of the elongated slot 37 is pressed against the stud shown in FIG. 3, while the latching lever 45 is pivoted into engagement with the stop abutment 51 under the urging of the spring 53. Subsequently, the control member 29 is pulled in the letter feed direction by the urging of the spring 39 until the end of the elongated slot 37 is pressed against the stud 17 as shown in FIG. 1.
  • the single print element of the typewriter may be replaced with another print element having type characters requiring a different or larger character spacing, for example, pica type.
  • the escapement mechanism 11 may be modified by replacing the escapement rack 19 having the pitch a with an escapement rack 19 having a pitch b as shown in FIG. 2.
  • such a substitution may be easily accomplished by pivotally supporting the two escapement racks l9, 19 for alternate movement into operating engagement with the feed pawl 15.
  • the settable tab stops 33 no longer have a character spacing corresponding to that of the escapement mechanism 11.
  • the tabulating mechanism 13 is designed to compensate for the 17 to bring the carriage C to a stop. At the same time,
  • the tab member 31 is pivotally supported by a stud 32 on the control member 29 and has an arm 57 urged against the control member 29 by a spring 59 stretched between the arm 57 and a suitable portion of the control member 29.
  • the tab member 31 has another arm 61 carrying a suitable roller 63 for engagement with a tab member control means.
  • the tab member control means is in the form of a bail 65 having a cyclically repeated camming surface 67 and which may be suitably supported on pivoted arms (not shown) whose free ends are secured to stub shafts 68 on the ends of the bail 65 to permit its pivotal movement under manual control, for example, to a lowered operating position as shown in FIGS. 2 and 3 when the escapement rack 19' having the pitch b is brought into operative association with the feed pawl 15.
  • the pivoting of the control member 29 brings the roller 63 carried by the tab member 31 into engagement with the camming surface 67 of the operatively positioned bail 65 so as to effect an oscillatory movement of the tab blade 35 as the carriage C moves relative to the typewriter frame F.
  • the camming surface 67 of the bail 65 is designed to pivot the tab member 31 so as to bring the tab blade 35 into engagement with set tab stops 33 at character spacings corresponding to the larger pitch of the alternate escapement rack 19'.
  • an escapement rack associated with said first element for relative movement therewith andhaving a plurality of teeth formed thereon each defining a character space
  • a feed pawl pivotally supported about a point on said second element for relative movement therewith and having a tooth for engaging the teeth of said escapement rack
  • said feed paw] being resiliently urged into engagement with said escapementrack for controlling the relative movement between said first and second elements in a letter feed direction
  • control member pivotally supported about the point on said second element for disengaging said feed pawl from said escapement rack during a tabulating operation to permit free relative movement between said first and second elements in the letter feed direction
  • a tab rack associated with said first element for relative movement therewith and having a plurality of settable tab stops each corresponding to a character space different from the character space defined by the teeth of said escapement rack,
  • a tab member having a tab blade for engaging a set tab stop on said tab rack during a tabulating operation
  • said tab member being pivotally supported on said control member for enabling the tab blade to be moved relative to said control member on said second element
  • tab member control means associated with said first element and operable in response to relative movement between said first and second elements during a tabulating operation for pivoting said tab member to alter the position of said second element relative to said first element upon engagement of the tab blade with a set tab stop to compensate for the difference in character spacing between the teeth of said engagement rack and the 'settable tab stops.
  • said tab member having an arm for engaging a cam ming surface
  • said tab member control means including a camming surface for engaging the arm of said tab member to pivot the tab blade in an oscillatory movement during free relative movement between said first and second elements in the letter feed direction, and
  • said camming surface defining an oscillatory movement of said tab blade to compensate for the difference in character spacing betweeen the escapement rack and the tab rack.
  • control member being slidably disposed about the point on said second element
  • latch means operable in response to the pivotal movement of said control member to effect free relative movement between said first and second elements for holding said control member in the pivoted position
  • control member being slidable about the point on said second element in response to the engagement of the tab blade with a set tab stop for being released from said latch means for pivotal movement to enable said feed pawl to reengage said escapement rack.
  • control member being slidably disposed about the point on said second element
  • latch means operable in response to the pivotal capement rack.

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  • Character Spaces And Line Spaces In Printers (AREA)
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US359129A 1972-05-16 1973-05-10 Tabulating mechanism for a dual pitch escapement Expired - Lifetime US3858706A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2223689A DE2223689C3 (de) 1972-05-16 1972-05-16 Tabuliereinrichtung

Publications (1)

Publication Number Publication Date
US3858706A true US3858706A (en) 1975-01-07

Family

ID=5844949

Family Applications (1)

Application Number Title Priority Date Filing Date
US359129A Expired - Lifetime US3858706A (en) 1972-05-16 1973-05-10 Tabulating mechanism for a dual pitch escapement

Country Status (8)

Country Link
US (1) US3858706A (de)
JP (1) JPS5228046B2 (de)
DE (1) DE2223689C3 (de)
FR (1) FR2185233A5 (de)
GB (1) GB1346979A (de)
IT (1) IT963658B (de)
NL (1) NL146434B (de)
SE (1) SE375942B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4134694A (en) * 1976-04-29 1979-01-16 Adlerwerke Vorm. Heinrich Kleyer A.G. Dual pitch tabular stop assembly
US4348124A (en) * 1980-06-27 1982-09-07 International Business Machines Corporation Tabulation rack with spring pin holding
US4348123A (en) * 1980-06-27 1982-09-07 International Business Machines Corporation Tabulation rack with spring pin holding

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6212916U (de) * 1985-07-05 1987-01-26

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1964748A (en) * 1929-08-09 1934-07-03 Coxhead Ralph C Corp Tabulating mechanism for typewriting machines
US3225886A (en) * 1963-01-17 1965-12-28 Royal Typewriter Co Inc Multi-uniform and variable pitch escapement mechanism
US3346087A (en) * 1963-09-25 1967-10-10 Ibm Pitch changing apparatus for proportional escapement typewriter
US3540565A (en) * 1968-01-09 1970-11-17 Ibm Universal tab member
US3547245A (en) * 1968-01-09 1970-12-15 Ibm Multiple pitch margin control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1964748A (en) * 1929-08-09 1934-07-03 Coxhead Ralph C Corp Tabulating mechanism for typewriting machines
US3225886A (en) * 1963-01-17 1965-12-28 Royal Typewriter Co Inc Multi-uniform and variable pitch escapement mechanism
US3346087A (en) * 1963-09-25 1967-10-10 Ibm Pitch changing apparatus for proportional escapement typewriter
US3540565A (en) * 1968-01-09 1970-11-17 Ibm Universal tab member
US3547245A (en) * 1968-01-09 1970-12-15 Ibm Multiple pitch margin control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4134694A (en) * 1976-04-29 1979-01-16 Adlerwerke Vorm. Heinrich Kleyer A.G. Dual pitch tabular stop assembly
US4348124A (en) * 1980-06-27 1982-09-07 International Business Machines Corporation Tabulation rack with spring pin holding
US4348123A (en) * 1980-06-27 1982-09-07 International Business Machines Corporation Tabulation rack with spring pin holding

Also Published As

Publication number Publication date
FR2185233A5 (de) 1973-12-28
DE2223689A1 (de) 1973-11-22
DE2223689C3 (de) 1974-09-12
GB1346979A (en) 1974-02-13
DE2223689B1 (de) 1974-02-21
SE375942B (de) 1975-05-05
NL7209741A (de) 1973-11-20
JPS5228046B2 (de) 1977-07-23
JPS4926012A (de) 1974-03-08
NL146434B (nl) 1975-07-15
IT963658B (it) 1974-01-21

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