US3854566A - Photoelectric tabulating apparatus - Google Patents

Photoelectric tabulating apparatus Download PDF

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Publication number
US3854566A
US3854566A US00363918A US36391873A US3854566A US 3854566 A US3854566 A US 3854566A US 00363918 A US00363918 A US 00363918A US 36391873 A US36391873 A US 36391873A US 3854566 A US3854566 A US 3854566A
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United States
Prior art keywords
shutter
signal
aperture
phototransducer
cylinder
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
US00363918A
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English (en)
Inventor
G Ellis
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.)
Xerox Corp
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Xerox 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 Xerox Corp filed Critical Xerox Corp
Priority to US00363918A priority Critical patent/US3854566A/en
Priority to CA191,334A priority patent/CA982969A/en
Priority to NL7403793A priority patent/NL7403793A/xx
Priority to DE2418530A priority patent/DE2418530A1/de
Priority to SE7406400A priority patent/SE390273B/xx
Priority to JP49055331A priority patent/JPS5020814A/ja
Priority to FR7417929A priority patent/FR2230504A1/fr
Priority to BE144647A priority patent/BE815420A/xx
Priority to GB2324974A priority patent/GB1442450A/en
Priority to IT23161/74A priority patent/IT1012805B/it
Application granted granted Critical
Publication of US3854566A publication Critical patent/US3854566A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J21/00—Column, tabular or like printing arrangements; Means for centralising short lines
    • B41J21/04—Mechanisms for setting or restoring tabulation stops
    • 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
    • B41J21/00—Column, tabular or like printing arrangements; Means for centralising short lines
    • B41J21/08—Mechanisms for initiating, effecting, skipping, or stopping tabulation movement; Means for centralising short lines

Definitions

  • ABSTRACT Apparatus for implementing the tabulating function on a typewriter or communications printer terminal.
  • An opaque cylinder is provided which rotates in synchronism with the relative movement between the printing mechanism and the recording medium.
  • the cylinder wall is perforated with a series of holes along a line of rotation and sliding shutters in the cylinder wall may be selectively displaced to either block a hole or allow the passage of light therethrough.
  • the holes correspond to character spaces, or print columns.
  • a light source and a phototransducer are aligned so that when a hole is clear, the phototransducer produces a signal in response to light impinging thereon from the light source.
  • the shutters are displaceable by two hammers, one on each side of the cylinder.
  • One of the hammers displaces the shutters into the tab clear position and the other hammer displaces the shutters into the tab set position. Receipt of a tab signal causes the apparatus to search for a hole which has its associated shutter displaced to the tab set position.
  • This invention relates to printing apparatus and, more particularly, to an arrangement for tabulation control in a typewriter-like printing terminal.
  • a typewriter-like printing terminal it is often desirable to provide an arrangement for setting and utilizing tab stops in a manner such as found on certain typewriters and communications printer terminals.
  • a communications printer terminal which is heavily electronic in implementation, it has been found difficult to provide conventional mechanical arrangements for the implementation of tabbing functions such as horizontal tab, vertical tab, and form feed.
  • These controls are the primary print head and paper movement controls for preparing tabular and/or formated printed material. It is desirable that these printing position controls should be settable, operable, and clearable from either a local (keyboard) or remote (another terminal or computer) source.
  • the arrangement should be nonvolatile (not lost due to power loss), compact, simple, reliable, and settable in any desired position (e.g.; any of 80 columns for horizontal tab).
  • a short section of a cylinder which is affixed to a shaft or other drive device which rotates in synchronism with the printhead or paper movement in a printing terminal.
  • a shaft or other drive device which rotates in synchronism with the printhead or paper movement in a printing terminal.
  • One such cylinder is required for horizontal tab control and another is required for vertical tab and form feed control.
  • the opaque cylinder shell is perforated with a series of small apertures along a line of rotation. Aligned with each aperture is a small sliding shutter having an opening therein. The shutter extends beyond the cylinder ends. In the tab set position a shutter opening aligns with a desired cylinder aperture whereas in the tab clear position the shutter blocks the cylinder aperture.
  • the shutters are positioned by two hammers, one on each end of the cylinder and directly opposed to each other.
  • the hammers are activated upon respective receipt of tab clear or tab set signals and each shutter remains in its set or clear position by spring detent or other means until relocated by a hammer.
  • a fixed light source is introduced to one side of the cylinder aperture in line with a phototransducer on the other side of the aperture. During printing, detection of a ta signal will cause the printhead or paper to advance until the next open aperture in the cylinder is reached.
  • FIG. 1 depicts a simplified schematic of a printer terminal in which the principles of this invention may be employed
  • FIG. 2 depicts an enlarged view of a tab cylinder incorporating the principles of this invention and FIG. 2(a a) depicts a shutter which may be utilized with the mechanism of FIG. 2;
  • FIG. 3 depicts an electrical schematic diagram of an illustrative tab control system
  • FIG. 4 depicts an electrical schematic diagram of an illustrative circuit which may be utilized to generate sensing signals from the phototransducer.
  • FIG. 1 depicted therein is a simplified schematic of a typical carriage drive mechanism utilized in a printer terminal.
  • the reader is referred to US. Pat. No. 3,686,678. Since an understanding of the carriage drive mechanism is only ancillary to an understanding of the present invention, only a brief description thereof is deemed necessary for the purpose of describing this invention.
  • Print head 10 Shown in FIG. 1 is a print head or printing mechanism 10 which is arranged to move laterally with respect to the recording medium 12.
  • Print head 10 may illustratively be an electrode stylus such as that disclosed in the aforementioned patent wherein recording medium 12 is a dielectric recording material upon which is deposited electric charge for later development by an electroscopic marking material.
  • print head 10 may be a golf ball or daisy wheel print head which moves across paper 12 and prints thereon by striking an inked ribbon interposed therebetween.
  • printing mechanism 10 may be stationary and recording medium 12 may move laterally, as is the case in a standard typewriter. What is important for the purposes of this invention is that there is relative movement in spaced increments between printing mechanism 10 and recording medium 12.
  • print head 10 is mounted on a slider bar, not shown, and is attached to cable 14.
  • Cable 14 is wrapped around idler pulleys 16 and 18 and is wound around capstan 20.
  • Capstan 20 is mounted for rotation on shaft 22 which is attached to print head drive 24.
  • Drive 24 may be either a stepping motor or a continuously driven motor.
  • the print head drive mechanism may be arranged so that drive 24 is bidirectional to return print head 10 to an initial starting point or the mechanism may have some other means, such as a return spring, for returning print head 10 to an initial point.
  • Mounted for rotation on shaft 28 is tab cylinder 26.
  • Shaft 28 is shown being drivingly connected to shaft 22 through worm drive 30, but it is understood that other methods of coupling the shafts 22 and 28 are also contemplated for use with this invention.
  • Cylinder 26 makes one or less revolutions each time print head 10 traverses recording medium 12 from an initial to a final position.
  • Tab cylinder 26 is illustratively a hollow cylinder with a single string of small holes equally spaced around the circumference of its surface.
  • light source 31 Internal to cylinder 26 is light source 31 in alignment with optical detector, or phototransducer, 32. Cylinder 26 is arranged, as will become evident from the following discussion, so that each of the holes 100 may be selectively blocked or left open. Each hole 100 corresponds to a particular character space, or column, as print head 10 traverses recording medium 12. These selective blockings and opening may be utilized to set tabs.
  • control circuit 34 receives signals from a local or remote input to cause print head 10 to traverse recording medium 12 and record printed indicia thereon.
  • the local input to control circuit 34 may be, for example, a typewriterlike keyboard and the remote input may be a computer vor similar device or another communications printer terminal.
  • the input may include a tab instruction so that circuit 34 may control drive 24 to move print head 10 rapidly across recording medium 12 until a signal from phototransducer 32 indicates the presence of a tab set condition at a particular character space, at which time the motion of print head 10 may be arrested.
  • circuit 34 may control drive 24 to move print head 10 rapidly across recording medium 12 until a signal from phototransducer 32 indicates the presence of a tab set condition at a particular character space, at which time the motion of print head 10 may be arrested.
  • FIG. 2 shown therein is an illustrative horizontal tab cylinder 26 embodying the principles of this invention.
  • the shell of cylinder 26 is perforated with a single string of small holes 100 equally spaced around its circumference. For an 80 column print line, 80 such holes 100 will be provided. Each hole 100 thus corresponds to a print position, or character space.
  • the arc length within which each hole 100 is placed, and the limits of the hole 100 dimensions, are determined from simple geometry. Let A arc length, R radius of cylinder 26, C circumference of cylinder 26, and H number of holes 100. Then:
  • the cylinder 26 has a 3 inch diameter and there are 80 holes 100 corresponding to 80 character spaces per line, then A equals 0.118 inches.
  • the diameter of the holes 100 must be less than 0.1 l8 inches.
  • small rectangular slits may be employed. Their center to center spacing must be 0.1 18 inches for the above example and their width must obviously be less than that figure.- it is clear then that in order to utilize a small diameter cylinder 26, the holes 100 and the subsequently described mechanism must be produced in a precision manner.
  • FIG. 2(a) shows a detailed view of such a shutter '102 having an opening 103.
  • hammers 104C and 1048 Aligned with shutters 102 are two hammers, 104C and 1048, one on either side of cylinder 26. These hammers 104C and 1048 are electrically operated solenoids and are fixedly mounted on a surface, not shown.
  • Hammer 1048 is the set tab" hammer which, when activated, taps a sliding shutter 102 with which it is aligned so that opening 103 exposes the hole in the cylinder wall.
  • the shutter 102 remains in position through some detent method, such as a flat or wire compressing spring between it and the cylinder cavity, a coil spring loaded ball, friction fit, or other.
  • Hammer 104C is the clear tab" hammer and when it is activated it strikes a shutter 102 so as to move the shutter 102 to cover the associated hole 100 so that no light can pass therethrough.
  • Cylinder 26 may rotate continuously or in step with the printing which is occurring, but the hammers 104C and 1048 can only be activated when the cylinder 26 is stopped or is being stepped at a relatively slow speed.
  • a continuous light source is applied to one surface of the cylinder 26 in line with the holes 100. It is shown in FIG. 2 to be illustratively introduced from the inside surface from lamp 106 through light pipe 108.
  • Light pipe 108 may be employed to simplify mounting and positioning of the light and may be a solid glass or plastic or a small non-coherent fiber optic bundle.
  • One end of cylinder 26 is open to permit access of the light source.
  • a phototransducer 32 which may be a phototransistor.
  • Phototransducer 32 is aligned with the holes 100 such that when a hole 100 is not obstructed by a shutter 102, the light from source 106 will pass through the hole 100 and cause a signal to appear at the output of the phototransducer 32.
  • hammers 104C and 1048 are aligned with the shutter 102 which is associated with the hole 100 through which light from source 106 passes to phototransducer 32.
  • Hammers 104C and 1048, phototransducer 32, and shaft 28 all lie in the same plane and the light from source 106 passes through the hole 100 in that plane.
  • Communication interface logic and decoder 300 is connected via communication link 302 to a remote input source such as a computer, not shown.
  • Tab commands are entered and decoded therein to control the operation of print head drive 24.
  • Tab commands may also be generated from a local keyboard via tab" switch 304, tab set switch 306 and tab clear switch 308.
  • To set a tab the print head 10 is moved to the column of interest and a tab set signal is entered either from logic and decoder 300 or tab set key 306. This signal is transmitted through OR gate 310 to activate one-shot 312 to produce a pulse which causes driver 314 to operate set hammer 1048.
  • set hammer 104$ moves the shutter 102 corresponding to that column of interest into a position where light may pass from source 106 through the corresponding hole 100 to phototransducer 32.
  • a tab clear" command can come from logic and decoder 300 or tab clear” key 308, through OR gate 316, and then a pulse is generated from one-shot 318 to cause driver 320 to operate clear hammer 104C.
  • the operation of clear hammer 104C moves the corresponding shutter 102 so as to block light from source 106 through the corresponding hole 100. Thereafter, during a printing operation, a ta signal may be received either from logic and decoder 300 or tab key 304.
  • This signal passes through OR gate 322 and through one-shot 324 to printer control logic 326.
  • Printer control logic 326 then acts to cause driver 328 to operate print head drive 24 to rapidly move the print head 10 across the recording medium 12.
  • Tab cylinder 26 rotates about shaft 28 in synchronism with the print head 10.
  • Light source 106 is always supplying light and phototransducer 32 is responsive to any light which it may receive from source 106. The print head and cylinder 26 will advance until a cylinder hole 100 is encountered which permits light passage from source 106. This triggers phototransducer 32 to send a signal through inverter 330 to oneshot 332 which then sends a pulse to printer control logic 326. This pulse causes logic 326 to arrest the motion of drive 24. Printing may then take place from this tab position.
  • FIG. 4 depicts an illustrative circuit which may be used with a phototransistor 32 utilized as the phototransducer element.
  • a phototransistor 32 utilized as the phototransducer element.
  • this transistor 32 When light from source 106 passes through a. hole 100 in the wall of cylinder 26 and impinges upon the base of phototransistor 32, this transistor 32 is turned on. The subsequent flow of current through phototransistor 32 into the base of transistor 330 causes transistor 330 to turn on, thereby causing the collector of transistor 330 to be at a low potential, placing the same low potential at terminal 340.
  • phototransistor 32 is off, thereby keeping transistor 330 in the off state. The collector of transistor 330, and consequently terminal 340, are then at a relatively high potential.
  • One system option can be the provision of a clear all tabs" signal (not shown) which may be employed to cause the print head 10 to step through all the columns and activate the clear hammer 104C as each shutter position is passed.
  • the mass of cylinder 26 should be small so as to minimize the effects of inertia, momentum, over-travel, etc., as repeated accurate positioning is essential. Depending upon printing and shaft rotational velocity, the
  • rotation of cylinder 26 may be bidirectional as the print.
  • a cylinder index point may be achieved by a light and phototransistor technique similar to that previously described. A hole in the closed end of the cylinder 26, aligned with the light and phototransistor would serve for this purpose.
  • additional holes in the closed end may be employed or additional holes adjacent to the tab stop holes 100 which are never closed by the shutters 102 may be employed, or a conventional shaft encoder may be mounted on the cylinder drive shaft 28 for this purpose.
  • a check circuit (for lamp, phototransistor, amplifiers, etc.) may be employed by, for example, reserving column number 1 for this purpose as it is seldom if ever utilized as a tab position. An always open hole in this position should cause a signal to be generated coincident with each carriage return signal. Failure to generate a signal upon a carriage return would set an alarm, interlock, operator indicator, or any similar purpose signal may be generated.
  • the phototransducer 32 and light source 106 would be positioned on the same side of the cylinder wall, either inside or outside the cylinder 26, and would be arranged so that light from the source 106 would be reflected from an exposed area to impinge upon the phototransducer 32.
  • Tabulator apparatus for use in a printer having relative movement in fixed increments between a printing mechanism and a recording medium, said apparatus comprising a cylindrical shell connected for rotation in synchronism with said relative movement, said shell having a plurality of apertures along a line of rotation of said shell, said apertures being spaced along said line to correspond to said fixed increments,
  • each of said shutters being associated with a respective one of said apertures and having an opening therein selectively alignable with a respective aperture
  • alight source mounted to transmit light to said apertures
  • a phototransducer having an output terminal for providing a signal thereon when light from said light source impinges on said phototransducer, said phototransducer being mounted in spatial relation to said shell so that said apertures pass said phototransducer in correspondence with the relative movement of said printing mechanism and said recording medium, light from said light source impinging on said phototransducer only when a shutter opening is aligned with a respective aperture passing said phototransducer.
  • the apparatus of claim 1 further including a first selectively actuatable hammer mounted relative said shell so as to be adjacent a first end of the shutter associated with the aperture passing said phototransducer,
  • a second selectively actuatable hammer mounted relative said shell so as to be adjacent the second end of the shutter associated with the aperture passing said phototransducer
  • first means responsive to a first signal for actuating said first hammer to position said adjacent shutter so as to align the opening of said adjacent shutter with said passing aperture
  • the apparatus of claim 2 further including driving means energizable in response to a third signal for causing relative movement between said printing mechanism and said recording medium, and
  • tabulator apparatus comprising a cylinder arranged to rotate in synchronism with said relative movement, said cylinder having a plurality of apertures along a line of rotation thereof, each of said apertures corresponding to a respective one of said defined columns and being at a fixed point as the printing mechanism and recording medium define the respective column,
  • each of said shutters being associated with a respective one of said apertures and having an opening therein aligned with a respective aperture when said shutter is in said first position and blocking said aperture when said shutter is in said second position,
  • a light source mounted to transmit light to the aperture at said fixed point
  • an optical detector mounted adjacent said fixed point, said detector providing a signal when light from said light source impinges thereon, said light impinging on said detector only when the shutter associated with an aperture at said fixed point is in said first position,
  • first means mounted adjacent a first end of the shutter associated with the aperture at said fixed point, said first means being responsive to a first signal for moving said adjacent shutter to said first position
  • second means mounted adjacent the second end of the shutter associated with the aperture at said fixed point, said second means being responsive to a second signal for moving said adjacent shutter to said second position
  • I driving means energizable in response to a third sig- 5.
  • tabulator apparatus comprising a cylinder arranged to rotate in synchronism with said relative movement, said cylinder having a plurality of apertures along a line of rotation thereof, each of said apertures corresponding to a respective one of said defined printing lines and being at a fixed point as the printing mechanism and recording medium define the respective printing line,
  • each of said shutters being associated with a respective one of said apertures and having an opening therein aligned with a respective aperture when said shutter is in said first position and blocking said aperture when said shutter is in said second position,
  • a light source mounted to transmit light to the aperture at said fixed point
  • an optical detector mounted adjacent said fixed point, said detector providing a signal when light from said light source impinges thereon, said light impinging on said detector only when the shutter associated with an aperture at said fixed point is in said first position,
  • first means mounted adjacent a first end of the shutter associated with the aperture at said fixed point, said first means being responsive to a first signal for moving said adjacent shutter to said first position
  • second means mounted adjacent the second end of the shutter associated with the aperture at said fixed point, said second means being responsive to a second signal for moving said adjacent shutter to said second position

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  • Common Mechanisms (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
US00363918A 1973-05-25 1973-05-25 Photoelectric tabulating apparatus Expired - Lifetime US3854566A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US00363918A US3854566A (en) 1973-05-25 1973-05-25 Photoelectric tabulating apparatus
CA191,334A CA982969A (en) 1973-05-25 1974-01-30 Tabulating apparatus
NL7403793A NL7403793A (ja) 1973-05-25 1974-03-20
DE2418530A DE2418530A1 (de) 1973-05-25 1974-04-17 Tabulator-einrichtung
SE7406400A SE390273B (sv) 1973-05-25 1974-05-14 Tabulatorapparat for skrivare
JP49055331A JPS5020814A (ja) 1973-05-25 1974-05-17
FR7417929A FR2230504A1 (ja) 1973-05-25 1974-05-22
BE144647A BE815420A (fr) 1973-05-25 1974-05-22 Appareil de tabulation pour un dispositif d'impression
GB2324974A GB1442450A (en) 1973-05-25 1974-05-24 Tabulating apparatus
IT23161/74A IT1012805B (it) 1973-05-25 1974-05-24 Apparecchiatura di tabulazione da usare in una macchina stampante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00363918A US3854566A (en) 1973-05-25 1973-05-25 Photoelectric tabulating apparatus

Publications (1)

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US3854566A true US3854566A (en) 1974-12-17

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Application Number Title Priority Date Filing Date
US00363918A Expired - Lifetime US3854566A (en) 1973-05-25 1973-05-25 Photoelectric tabulating apparatus

Country Status (10)

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US (1) US3854566A (ja)
JP (1) JPS5020814A (ja)
BE (1) BE815420A (ja)
CA (1) CA982969A (ja)
DE (1) DE2418530A1 (ja)
FR (1) FR2230504A1 (ja)
GB (1) GB1442450A (ja)
IT (1) IT1012805B (ja)
NL (1) NL7403793A (ja)
SE (1) SE390273B (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149619A (en) * 1971-09-14 1979-04-17 Casio Computer Co., Ltd. Tabulation control systems for printing apparatus
US6231250B1 (en) 1997-12-05 2001-05-15 Hitachi Koki Co., Ltd. Method of controlling reciprocal movement of hammer rank in print device
US6394676B1 (en) * 2000-02-10 2002-05-28 Premark Feg L.L.C. Media sensor system for printer mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4765026B2 (ja) * 2005-06-21 2011-09-07 株式会社エルゴジャパン 背凭れカバー

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1054875A (en) * 1912-08-31 1913-03-04 Union Typewriter Co Type-writing machine.
US2439470A (en) * 1944-11-14 1948-04-13 Ibm Variable spacing mechanism for typewriting machines
US2879876A (en) * 1955-11-17 1959-03-31 Ibm Single element printing machine
US2953231A (en) * 1959-04-24 1960-09-20 Ibm Automatic optical tabulating system
US3217856A (en) * 1963-03-28 1965-11-16 Ibm Paper feeding mechanisms for typewriters
US3315776A (en) * 1965-04-29 1967-04-25 Scm Corp Office machine with rotary carriage control member
US3429415A (en) * 1967-10-17 1969-02-25 Ricoh Kk Tab programming control system by means of codes
US3511353A (en) * 1965-06-01 1970-05-12 Int Computers & Tabulators Ltd Tape controlled apparatus
US3559792A (en) * 1967-07-21 1971-02-02 Berthold Fabrik H Digital display and control device for the setting, justification, and control of lines of print
US3656041A (en) * 1969-07-17 1972-04-11 Honeywell Inf Systems Apparatus for controlling the feeding of paper in high-speed printers
US3750797A (en) * 1970-12-28 1973-08-07 Ibm Carrier positioning and tabulation apparatus

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1054875A (en) * 1912-08-31 1913-03-04 Union Typewriter Co Type-writing machine.
US2439470A (en) * 1944-11-14 1948-04-13 Ibm Variable spacing mechanism for typewriting machines
US2879876A (en) * 1955-11-17 1959-03-31 Ibm Single element printing machine
US2953231A (en) * 1959-04-24 1960-09-20 Ibm Automatic optical tabulating system
US3217856A (en) * 1963-03-28 1965-11-16 Ibm Paper feeding mechanisms for typewriters
US3315776A (en) * 1965-04-29 1967-04-25 Scm Corp Office machine with rotary carriage control member
US3511353A (en) * 1965-06-01 1970-05-12 Int Computers & Tabulators Ltd Tape controlled apparatus
US3559792A (en) * 1967-07-21 1971-02-02 Berthold Fabrik H Digital display and control device for the setting, justification, and control of lines of print
US3429415A (en) * 1967-10-17 1969-02-25 Ricoh Kk Tab programming control system by means of codes
US3656041A (en) * 1969-07-17 1972-04-11 Honeywell Inf Systems Apparatus for controlling the feeding of paper in high-speed printers
US3750797A (en) * 1970-12-28 1973-08-07 Ibm Carrier positioning and tabulation apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149619A (en) * 1971-09-14 1979-04-17 Casio Computer Co., Ltd. Tabulation control systems for printing apparatus
US6231250B1 (en) 1997-12-05 2001-05-15 Hitachi Koki Co., Ltd. Method of controlling reciprocal movement of hammer rank in print device
US6394676B1 (en) * 2000-02-10 2002-05-28 Premark Feg L.L.C. Media sensor system for printer mechanism

Also Published As

Publication number Publication date
CA982969A (en) 1976-02-03
GB1442450A (en) 1976-07-14
BE815420A (fr) 1974-09-16
SE390273B (sv) 1976-12-13
NL7403793A (ja) 1974-05-27
JPS5020814A (ja) 1975-03-05
DE2418530A1 (de) 1974-12-12
IT1012805B (it) 1977-03-10
FR2230504A1 (ja) 1974-12-20

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