US3330398A - Printing head control allowing head to strike in free flight and be positively retracted - Google Patents

Printing head control allowing head to strike in free flight and be positively retracted Download PDF

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US3330398A
US3330398A US486846A US48684665A US3330398A US 3330398 A US3330398 A US 3330398A US 486846 A US486846 A US 486846A US 48684665 A US48684665 A US 48684665A US 3330398 A US3330398 A US 3330398A
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printing head
printing
platen
paper
pin
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US486846A
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John E Hylan
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Unisys Corp
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Burroughs Corp
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Assigned to BURROUGHS CORPORATION reassignment BURROUGHS CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). DELAWARE EFFECTIVE MAY 30, 1982. Assignors: BURROUGHS CORPORATION A CORP OF MI (MERGED INTO), BURROUGHS DELAWARE INCORPORATED A DE CORP. (CHANGED TO)
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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
    • B41J7/00—Type-selecting or type-actuating mechanisms
    • B41J7/92—Impact adjustment; Means to give uniformity of impression
    • 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
    • B41J7/00—Type-selecting or type-actuating mechanisms
    • B41J7/02—Type-lever actuating mechanisms
    • B41J7/30—Preventing rebound or clash of levers or type members

Definitions

  • This invention relates to apparatus for controlling the impression made by a printing element, and more particularly, relates to apparatus for controlling a single element printing head so as to be in free ight when impacting upon plural sheets of paper and sheets of carbon paper.
  • Single element printing heads are low-velocity highmass printing elements having a surface containing a plurality of characters.
  • a selected character is indexed by positioning the printing head prior to impacting it upon the paper through an ink-carrying ribbon.
  • the character is blurred on the carbon copies if the printing head is impacted under a constant pressure such as that provided by a spring.
  • the printing head frequently bounces several times unless it is restrained after printing. This also causes a blurred impression. To prevent this, it is desirable to have the printing head in free ight when it impacts on the paper and to have the printing head restrained immediately after printing on the paper.
  • apparatus having a driving means including complementary cams and complementary cam followers, a printing element, and a control surface on the printing head assembly which control surface forms a driven mating part with the driving means.
  • the complementary cam followers include a tapered slot.
  • the control surface on the printing head assembly is rigidly held by this slot during a iirst portion of the printing cycle and is loosely held in the slot during the printing stroke portion of the printing cycle.
  • the control surface of the printing head is held loosely by the slot.
  • the cam followers Just before the printing head strikes the paper the cam followers dwell so that the printing head strikes the paper in free flight, i.e., with no pressure applied to the printing head from an external source in the direction of the paper.
  • the printing head impacts on the papers one of the surfaces of the slot in the driving means catches the printv3,338,398 Patented July 11, 1967 ice ing head and moves it away from the papers 'before it has time to bounce.
  • a cushioned bumper is positioned so that the printing element hits it before hitting a single sheet of paper. The bumper subtracts some of the energy from the printing head to prevent it from cutting the paper. When several carbons are desired the top paper is held further away from the platen by the other Sheets of vpaper and sheets of carbon paper so that the printing head does not hit the cushioned bumper.
  • FIG. 1 is an elevational view of a platen, a single element printing head, and a control for the single element printing head;
  • FIG. 2 is a partial front view of the driving means and its mating driven control Surface for a single element printing head during the stroke portion of the printing cycle;
  • FIG. 3 is a partial front view of a driving means and the mating control surface of the driven means during another portion of the printing cycle.
  • FIG. 1 a single element printing head 10 is shown with solid lines as it is positioned during the stroke portion of the printing cycle and with broken lines as it is positioned during another portion of the printing cycle.
  • the printing head 10 impacts through an ink ribbon 12 onto papers held by a platen 14.
  • the ribbon is held by the ribbon mechanism housing 16.
  • T he printing head 10 is supported by a support member or lever 18 that is pivoted about the point 20 causing the printing head to impact upon the platen 14.
  • the support member 18 is rigidly attached to an abutment or pin 22, forming a control surface, shown as a solid line in FIG. 1 as it is positioned during the stroke portion of the printing cycle and as a broken line as it is positioned during another portion of the printing cycle.
  • Complementary cams 24 and 26 are mounted on the common shaft 28 and are driven together.
  • the complementary cam follower surface 30 is mounted to be driven by the cam 24 and the complementary cam follower surface 32 is mounted to be driven by the cam 26.
  • the complementary cam follower or rocker 34 is pinned at 35 so as to receive rotational forces in two directions from the cam follower surface 30 and the cam follower surface 32.
  • a slot 36 on the cam follower 34 drives the control surface of the driven means.
  • the slot 36 is shown as a solid line during the stroke portion of the printing cycle and as a broken line during another portion of the printing cycle.
  • a resilient bumper, preferable a neoprene rubber bumper 38 is positioned with respect to the support member 18 so that the support member 18 strikes the rubber bumper after traveling approximately 0.325" which is just before the printing head attached to the support member 18 strikes a single sheet of paper placed upon the platen 14. If several sheets of paper are placed one upon the other on the platen 14, the printing head 10 strikes the top sheet of paper before the shaft 18 strikes the rubber bumper 38.
  • the rubber bumper 38, the ribbon housing 16, the cams and cam followers are all attached to a rigid carrier 40 shown in part in FIG. 1.
  • the carrier 40 is movably mounted on the shaft 42 which runs parallel to the platen 14 so that the carrier 40 may be moved from the printing position to printing position.
  • This type of printing element is described more fully in Patent No. 2,879,876 to Palmer et al., issued Mar. 31, 1959.
  • the printing head may be indexed to a particular character by the mechanism described in patent application Ser. No. 319,836, now Patent No. 3,250,464, to Caspari, filed Oct. 29, 1963, and assigned to the same assignee as this application.
  • the cam follower 34 Each time the cams 24 and 26 are driven through a half cycle, the cam follower 34 impels the printing head towards the platen 14 and withdraws the printing head 10 from the platen 14 after it has impacted upon paper on the platen.
  • the slot 36 of the cam follower 34 drives the pin 22 during the first part of the stroke portion of the printing cycle and hesitates while the printing head and supporting member 18 move in free fiight towards the platen to impact with the papers placed upon the platen. Then the slot 36 is reversed in direction by the cam follower 34 to catch the pin 22 and pull the printing head away from the platen. If there is only one sheet of paper on the platen 14, the supporting member 18 hits the rubber bumper 38 before the printing head hits the single sheet of paper on the platen 14.
  • Complementary cams may be designed to provide the desired motion bythe method described on pages 112-114 of Cams by Harold A. Rothbart, John Wiley and Sons, Inc., New York, N.'Y., 1956.
  • FIG. 2 a front view is shown of the slot 36, the pin 22 .and the supporting member 18 as they are positioned with respect to each other during the stroke portion of a printing cycle.
  • the surface 44 is in contact with the pin 22 so as to drive the supporting member 18 about its pivot point 20 in the stroke portion of the printing cycle.
  • the slot 36 is large enough at this outward portion so that there is free play between the pin 22, the surface 44 and a -cam surface 46 of the slot 36.
  • the cam follower 34 pauses under the control of the cam (not shown) the pin 22 moves towards the surface 46 in the cam slot 36 so that the printing head (not shown) is in free ⁇ ight as it moves towards the platen.
  • the cam follower 34 is reversed in direction Yby the cam so that the surface 46 contacts the cam pin 22 so as to pull the printing head away from the platen and the pin to the end of the slot.
  • FIG. 3 a front view is shown of the slot 36, the pin 22 and the shaft 18 as they are positioned with respect to each other during another portion of the printing cycle.
  • the pin 22 is in a narrower portion of the slot 36 so that the slot 36 holds it firmly between its surfaces 44 and 46. In this position there is no free play in the motion of the printing head.
  • control for the printing head of this invention enables the printing head to be in free flight when it is used to print on several pages with carbon paper in between and yet controls the momentum of the printing head so that it will not cut the paper when the printing is to be done upon onlya single sheet of paper. Even though it drives the printing head into free ight during the stroke portion of the printing cycle, the driving means holds the printing head firmly during other portions of the printing cycle. Moreover, the driving means prevents bouncing of the printing head by catching it immediately after impact and pulling it away from the platen.
  • a single element printing device comprising:
  • a platen adapted to support paper on which characters are to be typed
  • a printing head having a plurality of characters upon at least one surface and being capable of being indexed so as to select one of said characters for ⁇ printing upon said paper;
  • a bumper rigidly positioned with respect to said shaft so as to stop the forward motion of said shaft as said printing head approaches within the thickness of three sheets of paper of said platen;
  • said complementary cam follower having a tapered slot and being positioned so as to engage said pin loosely during the positions of said shaft which are closest to said bumper and positioned so as to engage said pin tightly when said shaft is positioned furthest away.
  • cam means for driving said complementary cam follower so as to cause said slot to drive said pin in such a direction that said printing head approaches said platen, for causing said tapered slot to dwell just before said printing head impacts with said paper on said platen, and for moving said tapered slot so as to move said pin in such a direction as to pull said printing head away from said platen immediately after said printing head has impacted with said platen.
  • a platen adapted to support paper on which characters are to be typed
  • a printing head having a plurality of characters upon at least one surface and being capable of being indexed so as to select one of said characters for printing upon said paper;
  • a resilient bumper positioned with respect to said shaft so as to yieldingly oppose the forward motion of said shaft as said printing head approaches said platen;
  • said complementary cam follower having a tapered slot and being positioned so as to engage said pin loosely during the positions of said shaft which are closest to said bumper and positioned so as to engage said pin tightly when said shaft is positioned furthest away from said bumper;
  • cam means for driving said complementary cam follower so as to cause said slot to drive said pin in such a direction that said printing head approaches said platen, for causing said tapered slot to dwell just just before said printing head impacts with said paper on said platen, and for moving said tapered slot-so as to move said pin in such a'direction as to pull said printing head away from said platen immediately after said printing head has impacted with said platen.

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Description

E. HYLAN 3,330,398 OL ALLOWING HEAD TO STRIKE D BE POSITIVE/LY RETR D July l1, 1967 1.
PRINTING HEAD CONTR IN FREE FLIGHT AN Filed Sept. 1S, 1965 ACTE 2 Sheets-Sheet l July l1, 1967 J. E. HYL. 3,330,398
oNTaoL PRINTING HEAD C ALLO G D TO STRIKE IN FREE FLIGHT AND BE POSITIV RETRACTED v Filed Sept. 13, 1965 2 Sheets-Sheet 2 INVENTOR. JOHN E. HYLAN BY r 'vzwnz f.,
V.ATTORNEY United States Patent O 3,330,398 PRINTING HEAD CONTROL ALLOWING HEAD T STRIKE IN FREE FLIGHT AND BE P051- TIVELY RETRACTED John E. Hylan, Birmingham, Mich., assignor to Burroughs Corporation, Detroit, Mich., a corporation of Michigan Filed Sept. 13, 1965, Ser. No. 486,846 2 Claims. (Cl. 197-16) This invention relates to apparatus for controlling the impression made by a printing element, and more particularly, relates to apparatus for controlling a single element printing head so as to be in free ight when impacting upon plural sheets of paper and sheets of carbon paper.
Single element printing heads are low-velocity highmass printing elements having a surface containing a plurality of characters. A selected character is indexed by positioning the printing head prior to impacting it upon the paper through an ink-carrying ribbon. When a single element printing head is used with a plurality of sheets of paper having sheets of carbon between them, the character is blurred on the carbon copies if the printing head is impacted under a constant pressure such as that provided by a spring. Moreover, the printing head frequently bounces several times unless it is restrained after printing. This also causes a blurred impression. To prevent this, it is desirable to have the printing head in free ight when it impacts on the paper and to have the printing head restrained immediately after printing on the paper.
However, when carbons are not desired, the impact momentum is too great if the head has been in free flight. Also, the printing head should be held firmly when it is not being impelled in free flight towards the paper. Accordingly, it is an object of this invention to provide an improved control for a printing element.
It is a further object of this invention to provide apparatus for impelling a single element printing head in free flight towards the paper upon which it is to make an impression.
It is a further object of this invention to provide simple apparatus for reducing the momentum of a printing head when carbon copies are not desired.
It is a still further object of this invention to provide an apparatus which is able to drive a printing head towards the paper in free flight and is yet able to prevent repeated bouncing of the printing head upon the paper.
It is still a further object of this invention to provide apparatus for controlling a printing head so as to impel it in free flight towards the paper during the printing stroke and which is still able to hold the printing head firmly during other portions of the printing cycle.
In accordance with the above objects, apparatus is provided having a driving means including complementary cams and complementary cam followers, a printing element, anda control surface on the printing head assembly which control surface forms a driven mating part with the driving means.
The complementary cam followers include a tapered slot. The control surface on the printing head assembly is rigidly held by this slot during a iirst portion of the printing cycle and is loosely held in the slot during the printing stroke portion of the printing cycle. When the cam followers impel the driving means into the printing stroke portion of the printing cycle, the control surface of the printing head is held loosely by the slot. Just before the printing head strikes the paper the cam followers dwell so that the printing head strikes the paper in free flight, i.e., with no pressure applied to the printing head from an external source in the direction of the paper. After the printing head impacts on the papers one of the surfaces of the slot in the driving means catches the printv3,338,398 Patented July 11, 1967 ice ing head and moves it away from the papers 'before it has time to bounce.
If a single sheet of paper is used the printing head must move further towards the platen before impacting the paper. A cushioned bumper is positioned so that the printing element hits it before hitting a single sheet of paper. The bumper subtracts some of the energy from the printing head to prevent it from cutting the paper. When several carbons are desired the top paper is held further away from the platen by the other Sheets of vpaper and sheets of carbon paper so that the printing head does not hit the cushioned bumper.
The invention and other improvements thereof will be understood better and more completely from the following detailed description when considered with reference to the accompanying drawings in which:
FIG. 1 is an elevational view of a platen, a single element printing head, and a control for the single element printing head;
FIG. 2 is a partial front view of the driving means and its mating driven control Surface for a single element printing head during the stroke portion of the printing cycle; and
FIG. 3 is a partial front view of a driving means and the mating control surface of the driven means during another portion of the printing cycle.
In FIG. 1 a single element printing head 10 is shown with solid lines as it is positioned during the stroke portion of the printing cycle and with broken lines as it is positioned during another portion of the printing cycle. The printing head 10 impacts through an ink ribbon 12 onto papers held by a platen 14. The ribbon is held by the ribbon mechanism housing 16.
T he printing head 10 is supported by a support member or lever 18 that is pivoted about the point 20 causing the printing head to impact upon the platen 14. The support member 18 is rigidly attached to an abutment or pin 22, forming a control surface, shown as a solid line in FIG. 1 as it is positioned during the stroke portion of the printing cycle and as a broken line as it is positioned during another portion of the printing cycle.
Complementary cams 24 and 26 are mounted on the common shaft 28 and are driven together. The complementary cam follower surface 30 is mounted to be driven by the cam 24 and the complementary cam follower surface 32 is mounted to be driven by the cam 26. The complementary cam follower or rocker 34 is pinned at 35 so as to receive rotational forces in two directions from the cam follower surface 30 and the cam follower surface 32. A slot 36 on the cam follower 34 drives the control surface of the driven means. The slot 36 is shown as a solid line during the stroke portion of the printing cycle and as a broken line during another portion of the printing cycle.
A resilient bumper, preferable a neoprene rubber bumper 38 is positioned with respect to the support member 18 so that the support member 18 strikes the rubber bumper after traveling approximately 0.325" which is just before the printing head attached to the support member 18 strikes a single sheet of paper placed upon the platen 14. If several sheets of paper are placed one upon the other on the platen 14, the printing head 10 strikes the top sheet of paper before the shaft 18 strikes the rubber bumper 38.
The rubber bumper 38, the ribbon housing 16, the cams and cam followers are all attached to a rigid carrier 40 shown in part in FIG. 1. The carrier 40 is movably mounted on the shaft 42 which runs parallel to the platen 14 so that the carrier 40 may be moved from the printing position to printing position. This type of printing element is described more fully in Patent No. 2,879,876 to Palmer et al., issued Mar. 31, 1959. The printing head may be indexed to a particular character by the mechanism described in patent application Ser. No. 319,836, now Patent No. 3,250,464, to Caspari, filed Oct. 29, 1963, and assigned to the same assignee as this application.
Each time the cams 24 and 26 are driven through a half cycle, the cam follower 34 impels the printing head towards the platen 14 and withdraws the printing head 10 from the platen 14 after it has impacted upon paper on the platen. The slot 36 of the cam follower 34 drives the pin 22 during the first part of the stroke portion of the printing cycle and hesitates while the printing head and supporting member 18 move in free fiight towards the platen to impact with the papers placed upon the platen. Then the slot 36 is reversed in direction by the cam follower 34 to catch the pin 22 and pull the printing head away from the platen. If there is only one sheet of paper on the platen 14, the supporting member 18 hits the rubber bumper 38 before the printing head hits the single sheet of paper on the platen 14. When the slot 36 in the cam follower 34 is pulling the printing head away from the platen, the pin 22 is positioned in the narrow portion of the slot 36 so as to be held rigidly. Complementary cams may be designed to provide the desired motion bythe method described on pages 112-114 of Cams by Harold A. Rothbart, John Wiley and Sons, Inc., New York, N.'Y., 1956.
In FIG. 2 a front view is shown of the slot 36, the pin 22 .and the supporting member 18 as they are positioned with respect to each other during the stroke portion of a printing cycle. During this portion of a printing cycle, the surface 44 is in contact with the pin 22 so as to drive the supporting member 18 about its pivot point 20 in the stroke portion of the printing cycle. It will be noted that the slot 36 is large enough at this outward portion so that there is free play between the pin 22, the surface 44 and a -cam surface 46 of the slot 36. When the cam follower 34 pauses under the control of the cam (not shown) the pin 22 moves towards the surface 46 in the cam slot 36 so that the printing head (not shown) is in free` ight as it moves towards the platen. Immediately after impact the cam follower 34 is reversed in direction Yby the cam so that the surface 46 contacts the cam pin 22 so as to pull the printing head away from the platen and the pin to the end of the slot.
In FIG. 3 a front view is shown of the slot 36, the pin 22 and the shaft 18 as they are positioned with respect to each other during another portion of the printing cycle. When the printing head is not being driven towards the platen, the pin 22 is in a narrower portion of the slot 36 so that the slot 36 holds it firmly between its surfaces 44 and 46. In this position there is no free play in the motion of the printing head.
It can be seen that the control for the printing head of this invention enables the printing head to be in free flight when it is used to print on several pages with carbon paper in between and yet controls the momentum of the printing head so that it will not cut the paper when the printing is to be done upon onlya single sheet of paper. Even though it drives the printing head into free ight during the stroke portion of the printing cycle, the driving means holds the printing head firmly during other portions of the printing cycle. Moreover, the driving means prevents bouncing of the printing head by catching it immediately after impact and pulling it away from the platen.
Of course, many modifications and variations in the invention are possible in the light of the above teachings. It is therefore to be understood, that Within the scope of the appended claims, the invention may be practiced otherwise than as specifically described. What is claimed is:
1. In a single element printing device comprising:
a platen adapted to support paper on which characters are to be typed;
a printing head having a plurality of characters upon at least one surface and being capable of being indexed so as to select one of said characters for` printing upon said paper;
a shaft rigidly connected to said printing head for controlling the motion of said printing head;
a bumper rigidly positioned with respect to said shaft so as to stop the forward motion of said shaft as said printing head approaches within the thickness of three sheets of paper of said platen;
a complementary cam follower;
a pin rigidly attached to said shaft;
said complementary cam follower having a tapered slot and being positioned so as to engage said pin loosely during the positions of said shaft which are closest to said bumper and positioned so as to engage said pin tightly when said shaft is positioned furthest away.
from said bumper; and
cam means for driving said complementary cam follower so as to cause said slot to drive said pin in such a direction that said printing head approaches said platen, for causing said tapered slot to dwell just before said printing head impacts with said paper on said platen, and for moving said tapered slot so as to move said pin in such a direction as to pull said printing head away from said platen immediately after said printing head has impacted with said platen.
2. In a single element printing device comprising:
a platen adapted to support paper on which characters are to be typed;
a printing head having a plurality of characters upon at least one surface and being capable of being indexed so as to select one of said characters for printing upon said paper;
a shaft rigidly connected to said printing head for controlling the motion of said printing head;
a resilient bumper positioned with respect to said shaft so as to yieldingly oppose the forward motion of said shaft as said printing head approaches said platen;
a complementary cam follower;
a pin rigidly attached to said shaft;
said complementary cam follower having a tapered slot and being positioned so as to engage said pin loosely during the positions of said shaft which are closest to said bumper and positioned so as to engage said pin tightly when said shaft is positioned furthest away from said bumper; and
cam means for driving said complementary cam follower so as to cause said slot to drive said pin in such a direction that said printing head approaches said platen, for causing said tapered slot to dwell just just before said printing head impacts with said paper on said platen, and for moving said tapered slot-so as to move said pin in such a'direction as to pull said printing head away from said platen immediately after said printing head has impacted with said platen.
References Cited UNITED STATES PATENTS 749,914 1/ 1904 Blickensderfer 197-16 1,667,773 5/ 1928 Degener 197-17 1,755,197 4/1930 Von Reppert 197-17 1,803,082 12/1943 Von Reppert 197-17 2,847,105 8/ 1958 Barkdoll 197-29 3,126,823 3/1964 Benson 101-93 3,144,821 8/1964 Drejza 101-93 3,155,033 11/1964 Nelson et al 101-93 3,195,453 7/ 1965 Thiemann 1'01-93 3,233,715 2/1966 Flieg 197- -16 X 3,239,049 3/'1966 Voit 197-16 3,241,480 3/ 1966 Cunningham 101-93 ROBERT E. PULFREY, Primary Examiner.
E. S. BURR, .Assistant Examiner.

Claims (1)

1. IN A SINGLE ELEMENT PRINTING DEVICE COMPRISING: A PLATEN ADAPTED TO SUPPORT PAPER ON WHICH CHARACTERS ARE TO BE TYPED; A PRINTING HEAD HAVING A PLURALITY OF CHARACTERS UPON AT LEAST ONE SURFACE AND BEING CAPABLE OF BEING INDEXED SO AS TO SELECT ONE OF SAID CHARACTERS FOR PRINTING UPON SAID PAPER; A SHAFT RIGIDLY CONNECTED TO SAID PRINTING HEAD FOR CONTROLLING THE MOTION OF SAID PRINTING HEAD; A BUMPER RIGIDLY POSITIONED WITH RESPECT TO SAID SHAFT SO AS TO STOP THE FORWARD MOTION OF SAID SHAFT AS SAID PRINTING HEAD APPROACHES WITHIN THE THICKNESS OF THREE SHEETS OF PAPER OF SAID PLATEN; A COMPLEMENTARY CAM FOLLOWER; A PIN RIGIDLY ATTACHED TO SAID SHAFT; SAID COMPLEMENTARY CAM FOLLOWER HAVING A TAPERED SLOT AND BEING POSITIONED SO AS TO ENGAGE SAID PIN LOOSELY DURING THE POSITIONS OF SAID SHAFT WHICH ARE CLOSEST TO SAID BUMPER AND POSITIONED SO AS TO ENGAGE SAID PIN TIGHTLY WHEN SAID SHAFT IS POSITIONED FURTHEST AWAY FROM SAID BUMPER; AND CAM MEANS FOR DRIVING SAID COMPLEMENTARY CAM FOLLOWER SO AS TO CAUSE SAID SLOT TO DRIVE SAID PIN IN SUCH A DIRECTION THAT SAID PRINTING HEAD APPROACHES SAID PLATEN, FOR CAUSING SAID TAPERED SLOT TO DWELL JUST BEFORE SAID PRINTING HEAD IMPACTS WITH SAID PAPER ON SAID PLATEN, AND FOR MOVING SAID TAPERED SLOT SO AS TO MOVE SAID PIN IN SUCH A DIRECTION AS TO PULL SAID PRINING HEAD AWAY FROM SAID PLATEN IMMEDIATELY AFTER SAID PRINTING HEAD HAS IMPACTED WITH SAID PLATEN
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Cited By (9)

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US3461996A (en) * 1966-12-20 1969-08-19 Monroe Int Reed operated printer
US3574326A (en) * 1968-03-26 1971-04-13 Donald F Flynn Actuating mechanism for rotating printing disc
US3770095A (en) * 1970-02-02 1973-11-06 Olivetti & Co Spa Printing mechanism having a single printing element
US3838764A (en) * 1970-12-14 1974-10-01 Triumph Werke Nuernberg Ag Final positioning mechanism for single element type carrier
US3888339A (en) * 1971-08-07 1975-06-10 Triumph Werke Nuernberg Ag Impression control mechanism for a typewriter or similar machine
US3902419A (en) * 1972-08-19 1975-09-02 Agfa Gevaert Ag Apparatus for applying symbols to webs of photographic material or the like
US3980169A (en) * 1971-10-01 1976-09-14 Triumph Werke Nurnberg A.G. Impact control for single element printer
US4067429A (en) * 1975-03-21 1978-01-10 Ing. C. Olivetti & C., S.P.A. Selector system for a printing head for printing office machines
US4957380A (en) * 1988-03-14 1990-09-18 International Business Machines Corporation Tab adjust function for an electronic typewriter to permit the shifting of tabs from a first to a second format

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