US3752069A - Back printer print line visibility control - Google Patents

Back printer print line visibility control Download PDF

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Publication number
US3752069A
US3752069A US00158839A US3752069DA US3752069A US 3752069 A US3752069 A US 3752069A US 00158839 A US00158839 A US 00158839A US 3752069D A US3752069D A US 3752069DA US 3752069 A US3752069 A US 3752069A
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United States
Prior art keywords
platen
fingers
operating
latch
characters
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
US00158839A
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English (en)
Inventor
D Stiles
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
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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
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Publication of US3752069A publication Critical patent/US3752069A/en
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    • 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
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/20—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on endless bands or the like
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/18—Mechanisms for rendering the print visible to the operator

Definitions

  • FIG. 1 is a partial schematic plan view of a printer
  • the invention relates generally to printers and it has mechanism embodying the invention in one of its reference in particular to back printers and a movable platen therefor.
  • Another object of the invention is to provide for pivotally mounting a platen behind a type chain having spaced apart type carrying fingers so that the platen may be pivoted out of its operating position behind the fingers to permit viewing typed information through the spaces between the fingers as they move along the print line.
  • Yet another object of the invention is to provide for so controlling the operation of a movable platen used with a flexible type carrying band that it may be removed from its operating position behind a plurality of spaced apart type fingers carried by the band and moving along the print line, when the operator interrupts keying of information, so as to permit the operator to view what has been printed.
  • Yet another important object of the invention is to provide for operating a movable platen in a back printer so as to position the platen behind a flexible metal type finger character bearing type element during printing when a print hammer impacts a document against the type finger, and removes it from behind the type finger after printing, so that the printed character can be seen.
  • FIG. 2 is a partial schematic side elevational view of the printer mechanism of FIG. 1;
  • FIG. 3 is an enlarged partial front elevational view of the flexible type carrier of FIGS. 1 and 2;
  • FIG. 4 is a sectional view of the type carrier of FIG. 3 along the line 4--4;
  • FIGS is a schematic circuit diagram showing a control circuit for the printer platen mechanism of FIGS. 1 and 2.
  • FIGS. 1 and 2 show a printer apparatus of one type with which the present invention may be used.
  • the printer apparatus comprises generally a flexible Type Carrier 10 having a straight line path between Impact Means 11 and a Platen 12 for moving a plurality of type characters along a print line of a Document 14 for performing a printing operation thereon.
  • the Impact Means 11 may, as shown in FIGS. 1 and 2, comprise a plurality of Print Hammers 16, which are arranged in side-by-side relation along the print line on the side of the Document 14 away from the Type Carrier 10.
  • the Print Hammers 16 are pivotally mounted on a Shaft 18 and have an Armature Portion l9 positioned in operating relation with a stationary Magnetic Core Member 20.
  • the Magnetic Core Member 20 has an Operating Winding 22 thereon, which may be energized for actuating the Armature 19 to impact the Print Hammer 16 against the Document 14.
  • the Type Carrier 10 may comprise a flexible Band 24 of metal such as stainless steel or the like having a plurality of spaced apart upstanding Fingers 26, as shown in FIGS. 3 and 4.
  • the Fingers 26 carry raised Type Characters 28, and raised Projections 32 of magnetic material may be spaced apart along the body of the Band 24 and used in conjunction with a magnetic Transducer 33 to produce emitter signals for keeping track of the locations of the different type characters on the Type Carrier 10, so as to compare the characters on the Carrier 10 with characters to be printed either from data input from a keyboard or the like or from a computer processing unit for effecting timed operation of the Print Hammers 16 in relation to passage of the Type Characters 28 past print positions along the print line of the Document 14 in a well-known manner such as shown in the F. M.
  • the Fingers 26 are spacedapart so as to provide Spaces 29 therebetween.
  • the flexible Band 24 may extend between a pair of spaced apart wheels represented by the Wheel 34, which is rotatably
  • the platen may comprise a T-shaped member having a flat Bar Portion 40 forming the head of the T extending along the print line in spaced relation with the Print Hammers 16.
  • the Leg 42 of the Platen 12 extends away from the print line and is provided with a Pivot Shaft 44 for pivotally supporting the Platen on spaced apart supports represented by the Support 46, which is secured by means of Screws 47, to a Base 50.
  • An Adjustable Stop 52 having a layer of Elastic Material 53 to cushion the movement of the Platen 12 is threadably secured in the Base 50 to provide an adjustable stop for positioning the Platen 12.
  • a Spring 54 secured by means of a Screw 55 to the end of the Leg 42 and attached to the Base 50 biases the Platen to its operating position.
  • the Platen 12 shown in solid outline in the printing position interferes with a line of sight designated by the dot-dash line 58 in the direction of the arrow thereon along which an operator would otherwise be able to view characters printed on the Document 14 on the left side or the side facing the operator through the Spaces 29 as the Band 24 moves along the print line during printing.
  • a line of sight designated by the dot-dash line 58 in the direction of the arrow thereon along which an operator would otherwise be able to view characters printed on the Document 14 on the left side or the side facing the operator through the Spaces 29 as the Band 24 moves along the print line during printing.
  • the Platen may, for example, be rotated in a clockwise direction about the Pivot Shaft 44 to the dotted position 12 shown, in which it is clear of the line of sight 58, so that an operator may view characters printed on the Document 14 through the Spaces 29 between the upstanding Fingers 26 of the Type Carrier as it moves along the print line. Because of the persistence of vision phenomena the entire print line may be viewed as the Type Characters 26 pass therealong, even though the printed type characters themselves are at times obscured by the passing Fingers 26, so that an operator who is printing data by operating a keyboard may readily see what he has printed.
  • the reference numeral 60 represents a Solenoid connected to operate the Pull Rod 56 for removing the Platen 12 from the line of sight 58.
  • a Platen Drive Latch 62 is connected to effect energization of the Solenoid 60. Operation of the Latch 62 is effected by connecting the set terminal s of the Latch 62 to a source of electrical energy through each of the keys on the keyboard represented by the single Key 64. This connection is effected through a Single Shot 66 and an Inverter 68 with the Single Shot having a 1.2 second pulse so as to provide a 1.2 second delay for setting the Latch 62 after the Key 64-is depressed to type a character.
  • the Key 64 is also connected to the Reset Terminal R of the Latch 62 for resetting the Latch when a Key 64 is depressed.
  • the On output of the Latch 62 is connected to set a Print Control Latch 70 to provide a Print Inhibit signal at the On terminal N.
  • the Off terminal 0 of the Latch 70 is connected to provide a Print signal to a Printer Control and Hammer Select Circuit 72, which controls the energization of the Operating Winding 22 of a selected Print Hammer 16 in a manner similar to that described in the Demer et al., and Bloom, Jr. et al.
  • the 1.2 second delay time of the Single Shot 66 and Inverter 68 provides for maintaining the Platen 12 in the operating position so long as the operator continues to key at a more or less normal rate on the order of 3 to 5 characters per second. Should the time between operating successive keys exceed the 1.2 second delay time, this indicates that the operator is hesitating and wants to see what he is printing so permits the Platen to be pulled down.
  • the output of the Inverter 68 will be up and the Latch 62 will be set so that the Solenoid 60 is energized to operate the Pull Rod 56 and pull the Platen 12 down to clear the sight line.
  • the Single Shot 66 will be energized to provide a timed output pulse.
  • the Inverter 68 output does not rise until the fall of the output signal of the Signal Shot 66.
  • the reset input R of the Latch 62 is energized directly and the Latch 62 is reset, turning off the On output and de-energizing the Solenoid 60 so that the Platen 12 is restored to the operating position by the Restore Spring 54.
  • the Off output of the Latch 62 is connected to reset the Latch 70 through the Single Shot 74 and the Inverter 75. Since the Single Shot has a pulse duration on the order of 20 milliseconds, the Latch 70 will be reset after a 20 millisecond delay, thus removing the print inhibit signal at the On output and producing the print signal at the Off output to effect operation of a print hammer by energizing its Operating Winding 22 through the Printer Control & Hammer Select Circuit 72.
  • a type carrier comprising an endless band mounted on spaced apart pulleys and having type characters on upwardly projecting fingers which have spaces therebetween and are movable along a print line on one side of a document on which a printing operation is to be performed,
  • print hammer means on the other side of said document selectively operable to impact said document against said type characters for printing characters thereon
  • a movable platen positioned on the other side of said type carrier from said document and extending along the print line to provide a backing for said fingers, said platen being normally aligned in an operating position behind said characters on said fingers and blocking said spaces between said fingers, and having operating means for moving said platen away from said print line and out of blocking relation with with said spaces so that characters printed on said document can be observed through the spaces between said fingers.
  • the invention as defined in claim 6 characterized by one or more operating keys so connected as to be operable to selectively energize different ones of said hammer means for printing, and circuit means including switch means connected in circuit with said solenoid means actuated by said operating keys to effect energization of said solenoid means between printing operations.
  • circuit means including delay means controlled by said operating keys connected in circuit relation with said switch means to delay energization of said solenoid means for a predetermined interval after a printing operation.
  • circuit means including a first latch so connected as to be reset by said operating key and set by said delay means, and a second latch so connected to said first latch as to be set when said first latch is set and so connected by delay means as to be reset a predetermined time after said first latch is set to effect energization of said print hammer means.

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  • Accessory Devices And Overall Control Thereof (AREA)
  • Handling Of Sheets (AREA)
US00158839A 1971-07-01 1971-07-01 Back printer print line visibility control Expired - Lifetime US3752069A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15883971A 1971-07-01 1971-07-01

Publications (1)

Publication Number Publication Date
US3752069A true US3752069A (en) 1973-08-14

Family

ID=22569937

Family Applications (1)

Application Number Title Priority Date Filing Date
US00158839A Expired - Lifetime US3752069A (en) 1971-07-01 1971-07-01 Back printer print line visibility control

Country Status (7)

Country Link
US (1) US3752069A (enrdf_load_stackoverflow)
JP (1) JPS5217767B1 (enrdf_load_stackoverflow)
CA (1) CA951573A (enrdf_load_stackoverflow)
DE (1) DE2224951C3 (enrdf_load_stackoverflow)
FR (1) FR2144440A5 (enrdf_load_stackoverflow)
GB (1) GB1327358A (enrdf_load_stackoverflow)
IT (1) IT955532B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960074A (en) * 1974-09-16 1976-06-01 Shugart Associates Line printer having hammer which spans three print positions
US4196666A (en) * 1976-03-04 1980-04-08 Hitachi Koki Company, Limited Printing apparatus having print line visibility control
US4527920A (en) * 1983-06-13 1985-07-09 International Business Machines Corporation Print hammer firing compensation circuit for printer velocity variation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2712998C2 (de) * 1977-03-24 1983-12-22 Ibm Deutschland Gmbh, 7000 Stuttgart Typenbanddrucker
CA1102177A (en) * 1977-05-23 1981-06-02 Thomas T. Hardt Print band one edge guide

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3540373A (en) * 1967-07-21 1970-11-17 Scm Corp Reciprocable platen in selective print wheel printing machine
FR1597830A (enrdf_load_stackoverflow) * 1968-01-29 1970-06-29
US3583315A (en) * 1968-06-04 1971-06-08 Gen Electric High-speed printer having controlled acceleration ribbon positioning differential mechanism
FR1602392A (enrdf_load_stackoverflow) * 1968-11-19 1970-11-16
US3552309A (en) * 1969-04-24 1971-01-05 Ivan Tenev Stantchev Actuating means, resetting means and ribbon feed means in settable printing machines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960074A (en) * 1974-09-16 1976-06-01 Shugart Associates Line printer having hammer which spans three print positions
US4196666A (en) * 1976-03-04 1980-04-08 Hitachi Koki Company, Limited Printing apparatus having print line visibility control
US4527920A (en) * 1983-06-13 1985-07-09 International Business Machines Corporation Print hammer firing compensation circuit for printer velocity variation

Also Published As

Publication number Publication date
DE2224951B2 (de) 1980-10-23
DE2224951A1 (de) 1973-01-18
DE2224951C3 (de) 1981-07-09
GB1327358A (en) 1973-08-22
FR2144440A5 (enrdf_load_stackoverflow) 1973-02-09
IT955532B (it) 1973-09-29
CA951573A (en) 1974-07-23
JPS5217767B1 (enrdf_load_stackoverflow) 1977-05-18

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