US3837462A - Printing ribbon indexing system - Google Patents

Printing ribbon indexing system Download PDF

Info

Publication number
US3837462A
US3837462A US30865372A US3837462A US 3837462 A US3837462 A US 3837462A US 30865372 A US30865372 A US 30865372A US 3837462 A US3837462 A US 3837462A
Authority
US
United States
Prior art keywords
printing
clutch
ribbon
movement
printing ribbon
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
Inventor
R Patel
R Aleshire
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.)
NCR Corp
Original Assignee
Ncr
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 Ncr filed Critical Ncr
Priority to US30865372 priority Critical patent/US3837462A/en
Application granted granted Critical
Publication of US3837462A publication Critical patent/US3837462A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J33/00Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/14Ribbon-feed devices or mechanisms
    • B41J33/38Slow, e.g. "creep", feed mechanisms
    • B41J33/388Slow, e.g. "creep", feed mechanisms the ribbon being fed only when type impression takes place

Abstract

A low cost printing ribbon indexing mechanism for use with a printing mechanism utilizing a single operating hammer member. The indexing mechanism includes a printing ribbon supply reel mounted on a slip clutch, a motor driven take-up reel supplying tension to the ribbon, a feed roll mounted on a one-way clutch, a plurality of link members forming an assembly engaging the clutch and feed roll and actuated by the movement of the hammer in a printing direction to condition the clutch and feed roll for a feed operation and a resilient member engaging said assembly to operate the feed roll to withdraw a predetermined length of ribbon from the supply reel such that the hammer will print on a new area of the printing ribbon.

Description

States atent 11 1 1111 3,837,462 Patel et al. 1 Sept. 24, 1974 [54] PRINTING RIBBON INDEXING SYSTEM 3,727,743 4/1973 Hengelhaupt et ul. 197/151 UX [75] Inventors: Ramesh U. Patel, Cambridge; Rex OTHER PUBLICATIONS Alesh're Byesvllle both of Ohio IBM Technical Disclosure Bulletin, Carbon Ribbon [73] Assignee: The National Cash Register T P Clutch y Extension Spring,
Company Dayton, Ohio l1tch, Vol. 8, No. 11, Apr1l 1966, pp. 1,6251 ,626.
[22] Filed: 1972 Primary Examiner-Ernest T. Wright, Jr. [21] Appl. No.: 308,653 Attorney, Agent, or Firm-J. T. Cavender; Wilbert Hawk, Jr.; Richard W. Lavin [52] U.S. Cl. 197/151 51 Int. (:1 B4lj 33/14 [57] P M [58] Field of Search 197/43, 97, 151 A low Cost Prlmmg ribbon Indexing mechamsm for use with a printing mechanism utilizing a single oper- [56] References Cit d ating hammer member. The indexing mechanism in- UNITED STATES PATENTS cludes a printing ribbon supply reel mounted on a slip h clutch, a motor driven take-up reel supplying tension agi g to the ribbon, a feed roll mounted on a one-way 2 734614 M956 Page 197/15] clutch, a plurality of link members forming an assem- 219301470 3/1960 Roller et alt:III: 1:: 197/151 bly engaging the Clutch and feed You and actuated by 3,190,430 6/1965 McGrath 197/151 the movement Ofthe hammer in 3 Printing direction to 3,348,650 10/1967 Meinherz et a1 197/151 condition the clutch and feed roll for a feed operation 3,349,888 10/1967 Page 197/151 X and a resilient member engaging said assembly to op- 4,979 5/1969 Francisco 197/151 erate the feed roll to withdraw a predetermined length g tj of ribbon from the supply reel such that the hammer u son 3,612,242 10 1971 Cassell et al 197/151 W111 prmt on a new area of the pnmmg ribbon 3,645,374 2/ 1972 Allen 197/43 X 4 Claims, l Drawing Figure 1 PRINTING RIBBON INDEXING SYSTEM BACKGROUND OF THE INVENTION The present invention is directed to a printer mechanism for printing data in the form of bars on a record tag and more particularly to a low cost indexing mechanism for moving precise increments of printing ribbon past a printing hammer preparatory to a printing operation.
The printing mechanism of the present embodiment consists of two printing stations, each printing a different color bar. Since each printing station is of the same construction, only one station will be described herein. The color bars are printed on a record tag in a coded arrangement which represents information relating to the price of the item and also providing inventory information. The record tag is read during the sale of the item by a hand-held, optical probe scanner which is squibbed" or glided across the record tag. Information from this reading is transmitted to a data collection source or an electronic cash register from which merchandise operations are carried out and inventories are controlled. Reference should be made to US. Pat. No. 3,637,993, issued on Jan. 25, 1972 to J. B. Christie et al., for a disclosure of this type of information system.
SUMMARY OF THE INVENTION In the printing of record tags on which coded information is to be utilized as part of a merchandizing operation, it is desirable that the cost of the tags be kept at a minimum. One of the areas of cost in the printing of these tags is the amount of printing ribbon which is used to print the coded information on the tags. It is desirable that all of the surface area of the printing ribbon be utilized in the printing of the tags thus insuring that the cost of printing will be held at a minimum. In order to accomplish this result, costly and complex ribbon feed mechanisms were constructed. These characteristics have seriously restricted their use in this type of printing mechanism. Therefore, it is an object of this invention to provide a ribbon indexing mechanism which indexes a printing ribbon through very small precise increments of movement and which is low in cost and simple in construction. In carrying out the object of this invention, there is, provided an indexing mecha nism which includes a supply reel of printing ribbon mounted on a slip clutch, a motor driven take-up reel which supplies tension to the ribbon system, a feed roll mounted on a one-way clutch, a linkage assembly actuated by the operation of the print hammer to condition the one-way clutch for operation and a resilient member controlled by the linkage assembly for actuating the feed roll for moving the ribbon a predetermined distance past the print station.
BRIEF DESCRIPTION OF THE DRAWING DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the Drawing, there is shown the indexing mechanism of the present embodiment which includes a supply reel 20 of printing ribbon 21. The supply reel 20 is mounted on a hub 22 which, in turn is connected to a slip clutch 19. The slip clutch 19 is of standard construction and will supply a drag on the supply reel 20 whenever the supply reel 20 is rotated. The printing ribbon 21 is threaded over a plurality of roller members 23 and a guide member 24 to a take-up reel 25. The take-up reel 25 provides constant tension on the ribbon system by means of being connected to the drive shaft 26 of a motor 27 which enters a stall condition when the take-up reel 25 is not advancing. The tension supplied by the take-up reel 25 to the ribbon system is sufficient to wind ribbon 21 onto the take-up reel 25 but is less than the drag supplied to the supply reel 20 by i the slip clutch 19. Thus the take-up reel 25 will be unable to pull ribbon 21 from the supply reel 20. I
The printing ribbon 21 is engaged by a feed roll 28 and an associated pressure roller 30. The feed roll 28 is pinned to the shaft 31 of a one-way roller clutch 32 which is actuated by a depending arm 33 attached thereto. The one-way clutch 32 is of standard construction, an example of which that may be used is disclosed in US. Pat. No. 2,240,359 issued to D. W. Weizel on Apr. 29, 1941. Rotation of the arm 33 in a clockwise direction will allow the clutch 32 to slip over the shaft 31 while a counter-clockwise movement of the arm 33 will lock the clutch 32 to the shaft 31 thereby rotating the shaft 31 and the feed roll 28 in a direction to feed ribbon 21 from the supply reel 20to the take-up reel 25. The length of printing ribbon 21 that is moved by the feed roll 28 is determined by the arc covered by the rotation of the arm 33 in a feed direction. This construction allows maximum utilization of the surface area of the printing ribbon 21 by programming the length of feed according to the width of the printing hammer member 34, thus minimizing the cost of operation of the printing apparatus.
Associated with the ribbon 21 is a hammer member 34 which is reciprocally moved in a downward direction by an actuating member (not shown) to engage the ribbon 21 and print therefrom onto a record member (not shown). Positioned in the path of the hammer 34 is the end of a return cantilever spring 35 and one end 36 of a rotatably mounted link member 37. The link member 37 is rotatably mounted on a shaft 38 secured to the machine framework and rotatably supports, at its other end, one end of a link member 40, the other end of which is rotatably mounted on the arm 33 by means of stud 42. Mounted on the lower end of the arm 33 is one end of a spring member 41, the other end of which is secured to the machine framework. The spring member 41 normally biases the arm 33' in a counterclockwise direction.
In the operation of the printer, the hammer member 34 will be moved in a downward direction to engage the ribbon 21 thereby printing on the record material a colored indicia. Movement of the hammer member 34 will also rotate the spring 35 and the link member 37 in a counter-clockwise direction about the shaft 38 resulting in the clockwise rotation of the arm 33 by the link member 40 against the action of the spring member 41. The clockwise rotation of the arm 33 conditions the clutch 32 for rotation by the spring member 41 through an are determined by the counter-clockwise rotation of the link member 37. This counter-clockwise rotation of the arm 33 by the spring member 41 occurs upon release of the downward force on the hammer member 34. When this occurs the spring 35 will initiate this return movement of the hammer member 34 to its home position.
The counter-clockwise movement of the arm 33 by the spring member 41 will lock the clutch 32 onto the feed roll 28 thereby transmitting the rotation of the arm 33 to the feed roll 28. The counter-clockwise rotation of the feed roll 28 coacting with the pressure roller 30 will overcome the pressure of the slip clutch 19 on the supply reel 20 thereby withdrawing a portion of the ribbon 21 from the supply reel 20. This action will position a fresh portion of the ribbon 21 adjacent the hammer member 34 preparatory to a new printing operation.
The length of ribbon 21 that is withdrawn by the feed roll 28 from the supply reel 20 is determined by the location of the stud 42 on the arm 33. The positioning of the stud 42 and the link member 40 away from the center of rotation of the arm 33 will decrease the length of feed of the feed roll 28. It is obvious that if frequent changes of increments of feed are required, a slot 43 can be utilized for locating the stud 42 connection between the link member 40 and the arm 33 in a manner well known in the art. Thus it will be seen from this construction that a plurality of precise small increments of movement can be programmed for the operation of the feed roll 28 which allows full utilization of the printing ribbon 21 and reduces the cost of operating the printing mechanism. The full utilization of the ribbon 21 also provides the advantage of a longer machine operation due to less ribbon change requirements.
What is claimed is:
l. A mechanism for indexing a printing ribbon a predetermined distance past a printing member comprismg:
a. a supply reel of printing ribbon;
b. braking means engaging said supply reel for retarding movement of the printing ribbon from said supply reel;
c. means for continually tensioning said printing ribbon including a motor driven take-up reel for moving said printing ribbon from said supply reel to said take-up reel;
d. a printing member slidably mounted for reciprocal movement between a printing engagement with the printing ribbon and a home position;
c. drive means engaging said printing ribbon for driving said printing ribbon past said printing member when actuated in a first direction;
f. a one-way clutch means engaging said drive means, said clutch means actuating said drive means in a first direction when rotated in a first direction;
g. an actuator member mounted on said clutch means, said actuator member conditioning said clutch means for rotating in a first direction when rotated in a second direction;
h. a linkage assembly rotatably mounted adjacent said printing member and said actuator member, said linkage assembly having a portion positioned in the path of movement of said printing member and having a second portion mounted on said actuator member whereby movement of said printing member in a printing direction will engage and rotate said linkage assembly and said actuator member a predetermined distance in said second directron;
i. and actuating means engaging said actuator member for moving said actuator member in a first direction upon rotation of said actuator member in said second direction and movement of said printing member to said home position whereby said clutch means will rotate said drive means to move a portion of the printing ribbon past said printing member from said supply reel to said take-up reel.
2. The indexing mechanism of claim 1 in which said linkage assembly includes a link member selectively mounted along the longitudinal axis of said actuator member to control the length of movement of said actuator member in said second direction whereby the actuator member will rotate said drive means a distance commensurate with the length of movement of said actuator member in said second direction.
3. The indexing mechanism of claim 2 in which said braking means comprises a slip clutch member engaging said supply reel to provide a drag on the rotation of the supply reel when the printing ribbon is removed from the supply reel, said slip clutch member supplying a drag which is greater than the force of said motor driven take-up reel on said printing ribbon and said one-way clutch means includes a one-way clutch member which transmits a torque to said drive means when moved in said first direction which is greater than the drag of said slip clutch member whereby said take-up reel will move a portion of the printing ribbon from the supply reel to the take-up reel commensurate with the length of movement of said drive means in said first direction.
4. A mechanism for indexing a printing ribbon a predetermined distance past a print hammer comprising:
a. a supply reel of printing ribbon;
b. braking means engaging said supply reel for retarding movement of the printing ribbon from said supply reel;
c. means for continually tensioning said printing ribbon including a motor driven take-up reel for moving said printing ribbon from said supply reel to said take-up reel;
d. a print hammer slidably mounted for reciprocal movement between a printing engagement with the printing ribbon and a home position;
e. means for feeding a predetermined length of printing ribbon past said print hammer including a feed roll engaging said printing ribbon;
f. a one direction clutch engaging said feed roll;
g. an oscillatable actuating means drivingly connected to said clutch for transmitting reciprocatory movement thereto, said actuating means includes an arm member secured to said clutch;
h. a first link member selectively mounted on said arm member a predetermined distance from the center of operation of said clutch;
. a second link member rotatably mounted adjacent said print hammer, said second link member engaging said first link member and having a portion extending in the path of movement of said print hammer whereby upon movement of the print hammer in a printing direction, the second link member will be rotated to move said arm member and said clutch in a non-operating direction a distance commensurate with the mounting position of said first link member on said arm member;
6 j. and resilient means engaging said arm member for will be operated to feed the printing ribbon a disreturning the arm member to a home position and tance commensurate with the movement of said operating said clutch upon movement of said print arm member in a non-operating direction. hammer to its home position whereby said feed roll

Claims (4)

1. A mechanism for indexing a printing ribbon a predetermined distance past a printing member comprising: a. a supply reel of printing ribbon; b. braking means engaging said supply reel for retarding movement of the printing ribbon from said supply reel; c. means for continually tensioning said printing ribbon including a motor driven take-up reel for moving said printing ribbon from said supply reel to said take-up reel; d. a printing member slidably mounted for reciprocal movement between a printing engagement with the printing ribbon and a home position; e. drive means engaging said printing ribbon for driving said printing ribbon past said printing member when actuated in a first direction; f. a one-way clutch means engaging said drive means, said clutch means actuating said drive means in a first direction when rotated in a first direction; g. an actuator member mounted on said clutch means, said actuator member conditioning said clutch means for rotating in a first direction when rotated in a second direction; h. a linkage assembly rotatably mounted adjacent said printing member and said actuator member, said linkage assembly having a portion positioned in the path of movement of said printing member and having a second portion mounted on said actuator member whereby movement of said printing member in a printing direction will engage and rotate said linkage assembly and said actuator member a predetermined distance in said second direction; i. and actuating means engaging said actuator member for moving said actuator member in a first direction upon rotation of said actuator member in said second direction and movement of said printing member to said home position whereby said clutch means will rotate said drive means to move a portion of the printing ribbon past said printing member from said supply reel to said take-up reel.
2. The indexing mechanism of claim 1 in which said linkage assembly includes a link member selectively mounted along the longitudinal axis of said actuator member to control the length of movement of said actuator member in said second direction whereby the actuator member will rotate said drive means a distance commensurate with the length of movement of said actuator member in said second direction.
3. The indexing mechanism of claim 2 in which said braking means comprises a slip clutch member engaging said supply reel to provide a drag on the rotation of the supply reel when the printing ribbon is removed from the supply reel, said slip clutch member supplying a drag which is greater than the force of said motor driven take-up reel on said printing ribbon and said one-way clutch means includes a one-way clutch member which transmits a torque to said drive means when moved in said first direction which is greater than the drag of said slip clutch member whereby said take-up reel will move a portion of the printing ribbon from the supply reel to the take-up reel commensurate with the length of movement of said drive means in said first direction.
4. A mechanism for indexing a printing ribbon a predetermined distance past a print hammer comprising: a. a supply reel of printing ribbon; b. braking means engaging said supply reel for retarding movement of the printing ribbon from said supply reel; c. means for continually tensioning said printing ribbon including a motor driven take-up reel for moving said printing ribbon from said supply reel to said take-up reel; d. a print hammer slidably mounted for reciprocal movement between a printing engagement with the printing ribbon and a home position; e. means for feeding a predetermined length of printing ribbon past said print hammer including a feed roll engaging said printing ribbon; f. a one direction clutch engaging said feed roll; g. an oscillatable actuating means drivingly connected to said clutch for transmitting reciprocatory movement thereto, said actuating means includes an arm member secured to said clutch; h. a first link member selectively mounted on said arm member a predetermined distance from the center of operation of said clutch; i. a second link member rotatably mounted adjacent said print hammer, said second link member engaging said first link member and having a portion extending in the path of movement of said print hammer whereby upon movement of the print hammer in a printing direction, the second link member will be rotated to move said arm member and said clutch in a non-operating direction a distance commensurate with the mounting position of said first link member on said arm member; j. and resilient means engaging said arm member for returning the arm member to a home position and operating said clutch upon movement of said print hammer to its home position whereby said feed roll will be operated to feed the printing ribbon a distance commensurate with the movement of said arm member in a non-operating direction.
US30865372 1972-11-22 1972-11-22 Printing ribbon indexing system Expired - Lifetime US3837462A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US30865372 US3837462A (en) 1972-11-22 1972-11-22 Printing ribbon indexing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30865372 US3837462A (en) 1972-11-22 1972-11-22 Printing ribbon indexing system

Publications (1)

Publication Number Publication Date
US3837462A true US3837462A (en) 1974-09-24

Family

ID=23194846

Family Applications (1)

Application Number Title Priority Date Filing Date
US30865372 Expired - Lifetime US3837462A (en) 1972-11-22 1972-11-22 Printing ribbon indexing system

Country Status (1)

Country Link
US (1) US3837462A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3977512A (en) * 1975-06-30 1976-08-31 The Singer Company Ribbon cassette and ribbon advance
US4063500A (en) * 1975-09-25 1977-12-20 E.D.M. Co., Ltd. Rotary hot-stamping apparatus
DE2951534A1 (en) * 1978-12-23 1980-06-26 Canon Kk PRINTER
WO1983002752A1 (en) * 1982-02-10 1983-08-18 Poley, John Print carriage mounting for daisywheel printer
US4456193A (en) * 1981-09-16 1984-06-26 Bell & Howell Company Web advancement sensing methods and apparatus
DE3424045A1 (en) * 1983-06-30 1985-01-03 Alps Electric Co Ltd TYPE WHEEL PRINTER

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US713703A (en) * 1900-08-27 1902-11-18 Union Type Writer Company Type-bar mechanism for type-writers.
US980280A (en) * 1910-04-05 1911-01-03 Ward S Ireland Type-writing machine.
US2734614A (en) * 1956-02-14 Proportional ribbon feed mechanism
US2930470A (en) * 1958-11-24 1960-03-29 Ibm Reel mechanism for typewriter ribbons
US3190430A (en) * 1962-10-17 1965-06-22 Royal Mcbee Corp Ribbon handling mechanism
US3348650A (en) * 1961-08-12 1967-10-24 Mecanographie Japy Soc D Ribbon feed mechanism for typewriters, computers, and similar machines
US3349888A (en) * 1962-09-12 1967-10-31 Royal Typewriter Co Inc Vibrator type ribbon handling mechanism
US3444979A (en) * 1965-06-09 1969-05-20 Olivetti & Co Spa Ribbon feeding device for a variable spacing typewriter
US3481446A (en) * 1966-10-11 1969-12-02 Telefunken Patent Ribbon feeding arrangement for n-digit code imprints
US3548994A (en) * 1968-06-28 1970-12-22 Singer Co Proportional carbon ribbon feed mechanism
US3612242A (en) * 1968-02-01 1971-10-12 Ibm Automatic ribbon takeup
US3645374A (en) * 1969-11-28 1972-02-29 Singer Co Escapement-initiating mechanism for typewriter
US3727743A (en) * 1970-03-07 1973-04-17 Triumph Werke Nuernberg Ag Carbon ribbon transporting and installation facilities

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734614A (en) * 1956-02-14 Proportional ribbon feed mechanism
US713703A (en) * 1900-08-27 1902-11-18 Union Type Writer Company Type-bar mechanism for type-writers.
US980280A (en) * 1910-04-05 1911-01-03 Ward S Ireland Type-writing machine.
US2930470A (en) * 1958-11-24 1960-03-29 Ibm Reel mechanism for typewriter ribbons
US3348650A (en) * 1961-08-12 1967-10-24 Mecanographie Japy Soc D Ribbon feed mechanism for typewriters, computers, and similar machines
US3349888A (en) * 1962-09-12 1967-10-31 Royal Typewriter Co Inc Vibrator type ribbon handling mechanism
US3190430A (en) * 1962-10-17 1965-06-22 Royal Mcbee Corp Ribbon handling mechanism
US3444979A (en) * 1965-06-09 1969-05-20 Olivetti & Co Spa Ribbon feeding device for a variable spacing typewriter
US3481446A (en) * 1966-10-11 1969-12-02 Telefunken Patent Ribbon feeding arrangement for n-digit code imprints
US3612242A (en) * 1968-02-01 1971-10-12 Ibm Automatic ribbon takeup
US3548994A (en) * 1968-06-28 1970-12-22 Singer Co Proportional carbon ribbon feed mechanism
US3645374A (en) * 1969-11-28 1972-02-29 Singer Co Escapement-initiating mechanism for typewriter
US3727743A (en) * 1970-03-07 1973-04-17 Triumph Werke Nuernberg Ag Carbon ribbon transporting and installation facilities

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM Technical Disclosure Bulletin, Carbon Ribbon Take Up Clutch Powered by Extension Spring, Mimlitch, Vol. 8, No. 11, April 1966, pp. 1,625 1,626. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3977512A (en) * 1975-06-30 1976-08-31 The Singer Company Ribbon cassette and ribbon advance
US4063500A (en) * 1975-09-25 1977-12-20 E.D.M. Co., Ltd. Rotary hot-stamping apparatus
DE2951534A1 (en) * 1978-12-23 1980-06-26 Canon Kk PRINTER
US4456193A (en) * 1981-09-16 1984-06-26 Bell & Howell Company Web advancement sensing methods and apparatus
WO1983002752A1 (en) * 1982-02-10 1983-08-18 Poley, John Print carriage mounting for daisywheel printer
DE3424045A1 (en) * 1983-06-30 1985-01-03 Alps Electric Co Ltd TYPE WHEEL PRINTER

Similar Documents

Publication Publication Date Title
US3651916A (en) Printing device with interchangeable printing members
US3767020A (en) Manually positionable automatic printer
US4498792A (en) Printing and/or correcting device for printing machines
US3837462A (en) Printing ribbon indexing system
US3209681A (en) Rotary print head with selective character forming dies
US2672092A (en) Ink ribbon feeding and ink ribbon positioning mechanism for printing machines
US3861610A (en) Intermittent drive mechanism
US3884144A (en) Compact printer
US4439051A (en) Single printing station, multiple record member feeding mechanism
US3880078A (en) Hand-held label marking device
CA1191472A (en) Character selection and escapement system for serial impact printer
US3378127A (en) Data printer with flexible print wheel
US3677486A (en) Uniform ribbon feed apparatus
US3732812A (en) Differentially positionable type wheels in remotely controlled print modules
US3154185A (en) Typewriter ribbon control arrangement
US3310147A (en) Wheel striking data printer
US3762530A (en) Printing ribbon indexing system
US3977509A (en) Bar-code writer
US3902418A (en) Printing apparatus
US4850725A (en) Unidirectional ribbon drive mechanism
US2010652A (en) Printing mechanism
US3915086A (en) Printing apparatus
US3707910A (en) Optical bar code serial printer
US3668942A (en) Indexing mechanism
US3807301A (en) Printing apparatus in data issuing instrumentalities