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US3432020A - Small increment ribbon feed - Google Patents

Small increment ribbon feed Download PDF

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Publication number
US3432020A
US3432020A US519098A US3432020DA US3432020A US 3432020 A US3432020 A US 3432020A US 519098 A US519098 A US 519098A US 3432020D A US3432020D A US 3432020DA US 3432020 A US3432020 A US 3432020A
Authority
US
United States
Prior art keywords
ribbon
feed
spool
brake
tension
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
US519098A
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English (en)
Inventor
Allison H Caudill
Willie Goff Jr
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Application granted granted Critical
Publication of US3432020A publication Critical patent/US3432020A/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
    • B41J33/00—Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/14—Ribbon-feed devices or mechanisms
    • B41J33/16—Ribbon-feed devices or mechanisms with drive applied to spool or spool spindle
    • B41J33/22—Ribbon-feed devices or mechanisms with drive applied to spool or spool spindle by gears or pulleys

Definitions

  • Our ribbon mechanism provides small feed steps (in the order of 0.010 inch) with adequate precision without the use of complex measuring apparatus.
  • Our mechanism is unique in its simplicity, permitting it to be readily added to existing ribbon feed devices to provide multiple ribbon capabilities.
  • Existing single pass ribbon feed mechanisms employ some form of precision feed increment measuring such as a pawl and ratchet that take a precise step each advance cycle to move the ribbon some proportional amount.
  • the pawl and ratchet may control a capstan to eliminate feed variations due to diameter change of the take-up spool, as disclosed in the IBM Technical Disclosure Bulletin, vol. VI, No. 4, September 1963, page 17.
  • Mechanically metering extremely small incremental steps, as required for a single pass overstrike type of ribbon feed requires a wholly new feed drive that is not readily adaptable to machines already in service. The cost of a more complex feed system also must be weighed against the advantages of multiple ribbon selection.
  • Another object of this invention has been to provide a ribbon feed having precision that is independent of variations in temperature and humidity.
  • Another important object of this invention has been to provide a ribbon feed for an overstrike type of ribbon that is capable of feed increment adjustment to permit operator control of print quality.
  • a further object of this invention has been to provide a ribbon feed control attachment for adapting existing single pass ribbon feed mechanisms for operation with an overstrike type ribbon.
  • Our invention combines a slipping torque transmission in series with an incrementally pulsed resilient input drive and a ribbon dr-ag brake which maintains a substantial tension on ribbon supplied to a takeup spool.
  • the power source and slipping clutch are provided by an existing incrementing power source for a capstan ribbon feed, like that disclosed in the aforementioned IBM Technical Disclosure Bulletin.
  • a take-up spool drive as'disclosed therein includes a slip-force-limited spring belt transmission connected with the incremental power source. We employ this existing mechanism to provide a source of time and magnitude limited torque that is supplied to the take-up spool each occasion a ribbon advance is required.
  • a tension trapping brake preferably in the form of a pair of guide or tracking posts, provides a controlled resistance to ribbon winding.
  • the ribbon passes about the tracking posts and doubles back upon itself such that the brake retains ribbon tension at the take-up spool.
  • the incremental power source, the spring belt transmission, the take-up spool, and the tension trapping brake define a spring-mass system that is driven each feed cycle.
  • the response of the system to the fixed incremental drive varies with the eifective ribbon take-up diameter to compensate for the otherwise expected feed increase with diameter increase and thereby maintain a relatively constant linear feed increment.
  • Another phase or concept of our invention involves the provision of an automatic friction control device to compensate for frictional changes in the ribbon characteristics due to temperature and humidity. Such changes are accommodated by mounting the brake forming guide posts on a pivotally yieldable bracket arranged to permit the posts to move upon increased friction in a direction so as to slack off some of the contacting angle. The resultant frictional force is thereby decreased as required to produce a stable feed.
  • the automatic compensation mechanism further employs a manually adjustable datum set that sets the desired incrementing step by reducing or increasing the angular orientation of the braking guide posts. Accordingly, the operator can select a greater incremental step when it is desired to produce higher quality print with resulting reduced total character yield, or can select a lower quality print by reducing the ribbon feed increment for operations such as rough drafts, etc.
  • FIGURE 1 is a partial y broken away perspective view of a ribbon feed mechanism for a typewriter constructed in accordance with our invention.
  • FIGURE 2 is an enlarged plan view of the tension trapping brake shown as part of FIGURE 1.
  • a typewriter or other impact printer 10 having a platen 11 which cooperates with a print head 12 to define a printing station 13.
  • An appropriate printer is disclosed in US. Patent 2,919,002 entitled Selection Mechanism for a Single Printing Element Typewriter issued to L. E. Palmer on December 29, 1959. Printing is accomplished through the use of an inking or transfer ribbon 21 that preferably is made in accordance with either of the aforesaid US. patent applications, but the feed mechanism can advantageously be employed with any ribbon, tape, or other continuous web.
  • the ribbon 21 is fed by the novel mechanism of our invention which is mounted on a bracket or support plate 29.
  • the ribbon 21 is supplied from a spool or reel 22 rotatably mounted on pin shaft 23 and is guided through ribbon lift fingers 24 past the printing station 13.
  • a drag brake 25 that is pivoted about stud 25a and biased clockwise by a spring 25]), engages the outer periphery of the ribbon 21 on spool 22 to prevent overrun thereof which would otherwise cause loosening of the supply ribbon 21.
  • the ribbon 21 downstream of the printing station 13 is tracked around guide posts 33' and 32 of a tension trap friction drag brake and a guide member 26 to a takeup spool or reel 27 that is rotatably mounted on a pin shaft 28.
  • a typical dimensional relationship between the brake guide posts 31 and 32 and member 26 is shown in FIGURE 2 with reference to the following tabulation of significant dimensions.
  • a source 40 of incremental driving power or torque is provided of substantially the same construction as described in the aforesaid IBM Technical Disclosure Bulletin and includes a stepping pawl 41 and a ratchet wheel 42 having holes 43 therein defining rachet teeth therebetween.
  • Pawl 41 is pivotally connected to cam follower 41a by stud 41b and is urged into ratchet engagement by a spring 410.
  • a pin 41d is urged by a spring 41c into engagement with a cam 41 that is driven through a complete revolution during each print operation of the printer fit).
  • a slip limited torque or force transmission including pulleys 44 and 45, and an elastic resilient energy storing means or garter spring 46, connect the ratchet wheel 42 to the pin shaft 28 to provide a time and magnitude limited torque input to the take-up spool 27.
  • every operation of the pawl and ratchet 41, 42 will cause the application of a winding torque to take-up spool 27 which will result in a feed incrementing of the ribbon 21 resisted principally by the brake 30.
  • Our novel feed mechanism does not interfere with an existing feed for total release ribbons including ratchet driven capstan 47 and pinch roll 48 held against the capstan by a spring 49. In fact, the two mechanisms are alternately usable at the operators selection.
  • While the input to pulley 44 is a constant angular impulse each feed cycle, it is desired to cause a variable angular motion of the take-up spool 27 to compensate for its variation in diameter, and thereby generate a constant linear ribbon feed. Accordingly, when the spool 27 is empty it is necessary that it turn through a greater angle than when it is full.
  • Brake 30 performs this function by trapping the ribbon 21 upon itself.
  • Our two post, tension trap brake 30 has the highly versatile characteristic of providing a readily variable drag simply by changing the angular relationships between the ribbon Z1 and the two posts 31 and 32.
  • the bracket 34 is biased by a spring 35 to cause the posts 31 and 32 to present a large angle 'y as shown in FIGURE 2.
  • Increase in angle 7 corresponds to an increase in drag.
  • the braking posts 31 and 32 directly sense the ribbon tension and the bracket 34 yields, moving against the bias of spring 35 to reduce angle 7 and hence provide a lesser drag on the ribbon 21.
  • the system is automatically compensating and requires no attention from the operator. Ideally, the tension variation throughout the feeding of an entire ribbon should not cause significant change in angle 7. In practice, the variation tends to allow excess feed during the early or empty spool portions of feeding a ribbon.
  • Angle 'y is thereby made variable by the operator to vary the drag posed by the brake 30 and thus increases or decreases the feed stroke to select the desired number of print over-strikes and print quality. Acordingly, the operator can set the feed mechanism for either the highest quality print available from the ribbon, the highest character density, or something inbetween, depending upon the requirements of the particular job being prepared.
  • An impact printer ribbon feed mechanism comprising:
  • An impact printer as defined in claim 1 wherein in series power transmitting relationship with said said relatively fixed datum comprises: incremental power source, said transmission resilient means for adjusting the datum of said mounting energy storing means and said take-up spool being bracket to provide adjustable incremental stepping. interconnected for the transfer of limited force there- 5 3.
  • An impact printer as defined in claim 1 wherein between, said transmission and force limited connection comprises mutually exclusive, selectively operable first and seca garter spring-pulley assembly.
  • 0nd means for controllably engaging said ribbon said first means comprising a pinch roll and capstan References Cited directly coupled to said incremental power source UNITED STATES PATENTS for predetermined incremental movement thereby, v and said second means comprising brake means for 3 g gg zg zg g zgf tensm the supphed 803,400 10/1905 Conley 242 75.2 X said brake means comprising a friction brake having 1069985 8/1913 Steele 197 151 a 1,133,309 3/1915 Nall 242-752 pair of guide posts about which the ribbon is 1251081 12/1 17 M tracked said posts being supported on a mounting 9 eyer 226*195 X 2 554 028 5/1951 Helmond 197-151 bracket and oriented relatlve to the ribbon and to 3022724 2/1962 W rth 197 151 each other whereby the ribbon is caused to double o X back and engage itself at least at one point on one 20 OTHER REFERENCES of Posts; IBM

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  • Impression-Transfer Materials And Handling Thereof (AREA)
US519098A 1966-01-06 1966-01-06 Small increment ribbon feed Expired - Lifetime US3432020A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US51909866A 1966-01-06 1966-01-06

Publications (1)

Publication Number Publication Date
US3432020A true US3432020A (en) 1969-03-11

Family

ID=24066822

Family Applications (1)

Application Number Title Priority Date Filing Date
US519098A Expired - Lifetime US3432020A (en) 1966-01-06 1966-01-06 Small increment ribbon feed

Country Status (8)

Country Link
US (1) US3432020A (es)
BE (1) BE692040A (es)
CH (1) CH449667A (es)
DE (1) DE1561239B2 (es)
ES (1) ES335303A1 (es)
FR (1) FR1507797A (es)
GB (1) GB1156731A (es)
NL (1) NL6700096A (es)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3724633A (en) * 1970-12-30 1973-04-03 Ibm Feed system for an adhesive ribbon or the like
US3815494A (en) * 1972-02-01 1974-06-11 Madag Maschinen Apparatebau Apparatus for embossing moving webs
US3998313A (en) * 1973-04-16 1976-12-21 Docutel Corporation Paper web and ink ribbon feed control for character printer
US4079827A (en) * 1974-12-30 1978-03-21 Xerox Corporation Web tension control
US4132485A (en) * 1974-03-07 1979-01-02 Qume Corporation Ink ribbon cartridge with constant tension mechanism
US4302118A (en) * 1977-05-27 1981-11-24 International Business Machines Corporation Typewriter cartridge and feed mechanism therefor
US4347007A (en) * 1977-05-27 1982-08-31 International Business Machines Corporation Typewriter cartridge and feed mechanism therefor
US4383774A (en) * 1980-04-28 1983-05-17 Data Packaging Corporation Cartridge having ribbon inverting means
US4456193A (en) * 1981-09-16 1984-06-26 Bell & Howell Company Web advancement sensing methods and apparatus
EP0157627A2 (en) * 1984-04-02 1985-10-09 Xerox Corporation Loop tension ribbon cartridge
US4673141A (en) * 1985-09-12 1987-06-16 Ncr Corporation Feed control apparatus
US5372438A (en) * 1992-03-18 1994-12-13 Chung; Seng Y. Re-inking device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2447798C3 (de) * 1974-10-07 1981-11-26 Control Commerce AG, Ilanz, Graubünden Einrichtung zum Führen und Synchronisieren einen Farbbandes in Druckhammerschreibmaschinen und ähnlichen schreibenden Etikettendruckern

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US409447A (en) * 1889-08-20 Device for winding ban
US803400A (en) * 1905-05-03 1905-10-31 George F Conley Display-cabinet.
US1069985A (en) * 1912-05-14 1913-08-12 Monarch Typewriter Co Type-writing machine.
US1133309A (en) * 1914-05-08 1915-03-30 Goodyear Tire & Rubber Tensioning device.
US1251081A (en) * 1917-04-20 1917-12-25 Rose Patch And Label Co Label-making machine.
US2554028A (en) * 1948-12-11 1951-05-22 Underwood Corp Typewriter ribbon feed mechanism
US3022724A (en) * 1960-03-21 1962-02-27 Gottscho Inc Adolph Marking apparatus
US3346090A (en) * 1963-05-31 1967-10-10 Ibm Ribbon feed mechanism

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US409447A (en) * 1889-08-20 Device for winding ban
US803400A (en) * 1905-05-03 1905-10-31 George F Conley Display-cabinet.
US1069985A (en) * 1912-05-14 1913-08-12 Monarch Typewriter Co Type-writing machine.
US1133309A (en) * 1914-05-08 1915-03-30 Goodyear Tire & Rubber Tensioning device.
US1251081A (en) * 1917-04-20 1917-12-25 Rose Patch And Label Co Label-making machine.
US2554028A (en) * 1948-12-11 1951-05-22 Underwood Corp Typewriter ribbon feed mechanism
US3022724A (en) * 1960-03-21 1962-02-27 Gottscho Inc Adolph Marking apparatus
US3346090A (en) * 1963-05-31 1967-10-10 Ibm Ribbon feed mechanism

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3724633A (en) * 1970-12-30 1973-04-03 Ibm Feed system for an adhesive ribbon or the like
US3815494A (en) * 1972-02-01 1974-06-11 Madag Maschinen Apparatebau Apparatus for embossing moving webs
US3998313A (en) * 1973-04-16 1976-12-21 Docutel Corporation Paper web and ink ribbon feed control for character printer
US4132485A (en) * 1974-03-07 1979-01-02 Qume Corporation Ink ribbon cartridge with constant tension mechanism
US4079827A (en) * 1974-12-30 1978-03-21 Xerox Corporation Web tension control
US4347007A (en) * 1977-05-27 1982-08-31 International Business Machines Corporation Typewriter cartridge and feed mechanism therefor
US4302118A (en) * 1977-05-27 1981-11-24 International Business Machines Corporation Typewriter cartridge and feed mechanism therefor
US4383774A (en) * 1980-04-28 1983-05-17 Data Packaging Corporation Cartridge having ribbon inverting means
US4456193A (en) * 1981-09-16 1984-06-26 Bell & Howell Company Web advancement sensing methods and apparatus
EP0157627A2 (en) * 1984-04-02 1985-10-09 Xerox Corporation Loop tension ribbon cartridge
EP0157627A3 (en) * 1984-04-02 1986-11-20 Xerox Corporation Loop tension ribbon cartridge
US4673141A (en) * 1985-09-12 1987-06-16 Ncr Corporation Feed control apparatus
US5372438A (en) * 1992-03-18 1994-12-13 Chung; Seng Y. Re-inking device

Also Published As

Publication number Publication date
CH449667A (de) 1968-01-15
FR1507797A (fr) 1967-12-29
DE1561239A1 (de) 1970-03-19
BE692040A (es) 1967-05-29
DE1561239B2 (de) 1977-07-07
GB1156731A (en) 1969-07-02
ES335303A1 (es) 1968-04-01
NL6700096A (es) 1967-07-07

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