US3882774A - Device for reversing the direction of drive of an inked ribbon in a high-speed printer - Google Patents

Device for reversing the direction of drive of an inked ribbon in a high-speed printer Download PDF

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Publication number
US3882774A
US3882774A US403780A US40378073A US3882774A US 3882774 A US3882774 A US 3882774A US 403780 A US403780 A US 403780A US 40378073 A US40378073 A US 40378073A US 3882774 A US3882774 A US 3882774A
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US
United States
Prior art keywords
cam
ribbon
lever
arm
microswitch
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
US403780A
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English (en)
Inventor
Albert Pfiz
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.)
Walther Bueromaschinen GmbH
Original Assignee
Walther Bueromaschinen GmbH
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 Walther Bueromaschinen GmbH filed Critical Walther Bueromaschinen GmbH
Application granted granted Critical
Publication of US3882774A publication Critical patent/US3882774A/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
    • B41J33/00—Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/14—Ribbon-feed devices or mechanisms
    • B41J33/40—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction
    • B41J33/44—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction automatically
    • B41J33/51—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction automatically and characterised by the use of particular reversing control means
    • B41J33/516—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction automatically and characterised by the use of particular reversing control means using a reversing-feeler responsive to the tension of the ribbon

Definitions

  • ABSTRACT A device for reversing the direction of drive of an inked ribbon in a high-speed printer has a crank arm which guides the inked ribbonsuch that when the rib-,
  • a feed pawl on the crank arm pivots a ratchet wheel through a small angle and cam wheels rotating with the ratchet wheel actuate a cam lever which in turn engages the actuator of a microswitch connected in circuit with a synchronous motor which is reversible by the switch.
  • the present invention relates to driving the inked ribbon in a high-speed printer, more particularly, to a device for automatically reversing the direction of the drive of the ribbon.
  • ribbon reversing arrangement comprises an electrically conducting portion on each end of the ribbon.
  • the ribbon is permanently in contact with a fixed electrical contact or switch and after the ribbon has been unwound the electrically conducting portion will close a circuit on the contact device so that one motor may be switched off and the other motor switched on by means of a relay so as to change the direction of movement of the ribbon.
  • these devices 'and arrangements have been generally unsatisfactory in practice since they are relatively expensive with respect to the components required, complex in structure and thus bring about increased costs of manufacture and assembly.
  • the inked ribbons must be modified or specially prepared and in this connection reference is made to the German publication document OS 1 436 658.
  • a device for reversing the direction of drive of an inked ribbon in a high-speed printer may comprise a pivotally mounted crank having a guide pin on one of its lever arms such that a ribbon is guided over the pin.
  • a feed pawl is pivotally mounted on the other of the crank lever arms andis continuously urged by a spring into engagement with a rotably mounted ratchet wheel.
  • a pair of cam wheels are interconnected with the ratchet wheel so as to be rotatable therewith.
  • a cam lever is operatively engagable with the cam wheels and has an arm which is engagable with an actuator of a microswitch.
  • a synchronous motor drives the ribbon and is electrically connected to the microswitch so as to be reversible thereby.
  • the microswitch is actuated by the cam lever in response to the cam wheels upon angular movement of the ratchet wheel by the feed pawl when the crank arm is pivoted in response to a pull by the ribbon on the guide pin immediately prior to rewinding of the ribbon at which point the ribbon has been unwound from one spool.
  • FIG. 1 is a plan view of the ribbon reversing device in its normal position according to the present invention
  • FIG. 2 is a side view of the device of FIG. I viewed in the direction of the arrow A;
  • FIG. 3 is a plan view of the ratchet wheel and cam wheel components of the device of FIG. 1 showing the parts in position subsequently to switching of the direction of drive of the ribbon;
  • FIG. 4 is a view similar to that of FIG. 3 and showing the components back in the normal position;
  • FIG. 5 is a block diagram showing schematically the electrical circuit for reversing the direction of rotation of the synchronous motor driving the ribbon.
  • FIGS. 1 and 2 there is illustrated an inked ribbon 1 which is driven continuously by a synchronous motor in a high-speed printer in a manner which is known in the art and is accordingly not shown in the drawings.
  • the ribbon 1 is actually reciprocated between two winding spools so as to be moved past a printing position or line of the printer in a manner known in the art.
  • the ribbon is positioned over and guided upon a pin 5 which extends outwardly from an arm 2 of an angular or crank lever 4 pivotally mounted on shaft 3.
  • the ribbon 1 is in one of its end positions at which position it is unwound from one spool and completely wound on the other spool the additional drive on the ribbon will produce an increased tension or pull upon the ribbon.
  • a feed pawl 11 is pivotally mounted on the outer end 7 of the arm 7.
  • a spring 10 acts upon an end of the feed pawl 11 so as to urge the feed pawl continuously into engagement with teeth 12 of a ratchet wheel 12 rotatably mounted on a shaft 13.
  • the ratchet wheel pivots through an angle defined by the space between the teeth 12' in the direction indicated by the arrow 14.
  • Cam wheels and 16 are secured to the ratchet wheel 12 so that the cam wheels will move through the same pivot angle as the ratchet wheel and simultaneously therewith.
  • a cam lever 18 is pivotally mounted on a pin 17 and on one end thereof has a sensing projection or feeler portion 19 which rides on the outer periphery 15' of the cam wheel 15 until such a time that the feeler portion 19 drops into a recess 15". This will occur at the end of the pivoting path of the cam as shown in FIG. 3.
  • the cam lever 18 has a second arm 21 which is subjected to the action of tension spring 20 in such a manner that the arm 21 acts upon a plunger or actuator 22 of a microswitch 23.
  • a synchronous motor 24 is connected electrically with the microswitch 23 in the manner shown schematically in FIG. 5.
  • the motor 24 is thus reversible in response to actuation of microswitch 23 and its reversal of direction of rotation reverses the direction of feed of the inked ribbon.
  • the present invention has disclosed a simple but effective device for reversing the direction of drive of an inked ribbon in a high-speed printer. Only a slight increase in the tension upon the ribbon when it has been unwound from a spool is necessary to pivot the crank arm 19 and cause its feed pawl to switch or pivot the ratchet wheel 12 and cam wheels 15 and 16 through the small angles necessary to affect the switching step.
  • a device for reversing the direction of drive of an inked ribbon in a high-speed printer for data processing machines and the like comprising a pivotally mounted crank arm having first and second lever arms, a guide pin extending laterally from said first lever arm and adapted to guide an inked ribbon thereon, a feed pawl pivotally mounted on said second lever arm, a rotatably mounted ratchet wheel and interconnected first and second cam wheels rotatable therewith, spring means continuously urging said feed pawl into engagement with said ratchet wheel, a cam lever operatively engagable by said cam wheels, a microswitch engagable by said cam lever to be actuated thereby, and a synchronous motor drivingly connected to said inked ribbon and electrically connected to said microswitch so as to be reversible thereby, said microswitch actuated by said cam lever in response to said cam wheels upon angular movement of said ratchet wheel by said feed pawl when said crank arm is pivoted in response to

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  • Impression-Transfer Materials And Handling Thereof (AREA)
US403780A 1972-10-06 1973-10-05 Device for reversing the direction of drive of an inked ribbon in a high-speed printer Expired - Lifetime US3882774A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2249111A DE2249111C3 (de) 1972-10-06 1972-10-06 Vorrichtung zum Farbbandantrieb mit selbsttätiger Richtungsänderung in Schnelldruckwerken

Publications (1)

Publication Number Publication Date
US3882774A true US3882774A (en) 1975-05-13

Family

ID=5858352

Family Applications (1)

Application Number Title Priority Date Filing Date
US403780A Expired - Lifetime US3882774A (en) 1972-10-06 1973-10-05 Device for reversing the direction of drive of an inked ribbon in a high-speed printer

Country Status (9)

Country Link
US (1) US3882774A (hr)
JP (1) JPS4973220A (hr)
AT (1) AT335775B (hr)
CH (1) CH563883A5 (hr)
DE (1) DE2249111C3 (hr)
FR (1) FR2202473A5 (hr)
GB (1) GB1381834A (hr)
IT (1) IT993229B (hr)
SE (1) SE382588B (hr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0493942A1 (en) * 1990-12-31 1992-07-08 Neopost Limited Ink ribbon feed
US20130199318A1 (en) * 2010-09-03 2013-08-08 Kyungdong Navien Co., Ltd. Actuator assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112483460A (zh) * 2020-11-26 2021-03-12 扬州大学 一种防止传动轴反转的轴流泵叶轮结构
FR3133564B1 (fr) 2022-03-21 2024-02-09 Psa Automobiles Sa Ensemble de suspension comportant un bras de suspension a fixation renforcee sur un berceau

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011434A (en) * 1959-12-16 1961-12-05 Mach Tool Works Oerlikon Admin Reversing mechanism for type impression machines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714850A (en) * 1953-12-24 1955-08-09 Ibm Ribbon feed devices

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011434A (en) * 1959-12-16 1961-12-05 Mach Tool Works Oerlikon Admin Reversing mechanism for type impression machines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0493942A1 (en) * 1990-12-31 1992-07-08 Neopost Limited Ink ribbon feed
US5294203A (en) * 1990-12-31 1994-03-15 Alcatel Business Systems Limited Ink ribbon feed
US20130199318A1 (en) * 2010-09-03 2013-08-08 Kyungdong Navien Co., Ltd. Actuator assembly

Also Published As

Publication number Publication date
GB1381834A (en) 1975-01-29
ATA672373A (de) 1976-07-15
DE2249111A1 (de) 1974-04-11
AT335775B (de) 1977-03-25
CH563883A5 (hr) 1975-07-15
DE2249111B2 (de) 1980-07-03
DE2249111C3 (de) 1981-04-23
FR2202473A5 (hr) 1974-05-03
IT993229B (it) 1975-09-30
SE382588B (sv) 1976-02-09
JPS4973220A (hr) 1974-07-15

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