US3493091A - Print head shift mechanism - Google Patents

Print head shift mechanism Download PDF

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Publication number
US3493091A
US3493091A US717845A US3493091DA US3493091A US 3493091 A US3493091 A US 3493091A US 717845 A US717845 A US 717845A US 3493091D A US3493091D A US 3493091DA US 3493091 A US3493091 A US 3493091A
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US
United States
Prior art keywords
reed
printing
arm
magnets
print head
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
US717845A
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English (en)
Inventor
Ludwig J Kapp
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.)
TRIUMPH-ADLER AG A CORP OF GERMANY
Western Atlas Inc
Original Assignee
Litton Business Systems Inc
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 Litton Business Systems Inc filed Critical Litton Business Systems Inc
Application granted granted Critical
Publication of US3493091A publication Critical patent/US3493091A/en
Assigned to TRIUMPH-ADLER NORTH AMERICA, INC., A CORP. OF NEW YORK reassignment TRIUMPH-ADLER NORTH AMERICA, INC., A CORP. OF NEW YORK ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ROYAL BUSINESS MACHINES, INC.
Assigned to TRIUMPH-ADLER AG, A CORP. OF GERMANY reassignment TRIUMPH-ADLER AG, A CORP. OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TRIUMPH-ADLER NORTH AMERICA, INC.,
Anticipated expiration legal-status Critical
Assigned to TA TRIUMPH-ADLER AKTIENGESELLSCHAFT reassignment TA TRIUMPH-ADLER AKTIENGESELLSCHAFT RE-RECORD OF AN INSTRUMENT RECORDED AUG. 4, 1986 AT REEL 4587, FRAMES 403 TO CORRECT THE NAME OF THE ASSIGNEE. Assignors: TRIUMPH-ADLER NORTH AMERICA, INC.
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/24—Case-shift mechanisms; Fount-change arrangements

Definitions

  • FIG. 9A FORCE VERSUS DISPLACEMENT w WT 0mm OEP L WWW mMm x Q 10 a X A M E M L n w M M A 0 o ru R N xv E y M T a 0 m m .m w G0 I 0 L R REED VELOCITY DISPLACEMENT VERSUS TIME FIG. 9A
  • the arm is pivoted to a raised or lowered position to bring one or the other of the two type bands into printing position by actuating either one of the two opposed solenoids located above and below the arm and on one side of the point at which it is pivoted.
  • Acting together with the solenoids are two opposed springs which are connected to the other side of the pivot point. These springs are positioned so that when the arm is shifted from one position to the other by actuation of a solenoid, the spring opposite thereto will be stretched to store energy therein so that when the other solenoid is actuated, it will act together with that solenoid to bias the arm and thereby the print head to its new position.
  • the invention relates to an improvement in printing mechanisms, and particularly to a novel means for shifting a print head so that one or the other of two type bands thereon is moved into operative printing position.
  • Prior art devices relied on a single mechanism to actuate an arm to raise and lower a type member between one of two printing positions. Solenoids and other such mechanisms were often employed, but since only one mechanism was used, the fatigue on this mechanism through constant operation would eventually result in its failure.
  • a print head shifting mechanism which comprises opposed solenoids working in conjunction with opposed springs for biasing an arm and thereby a print head which is interconnected thereto between first and second printing positions.
  • opposed solenoids working in conjunction with opposed springs for biasing an arm and thereby a print head which is interconnected thereto between first and second printing positions.
  • opposed solenoid As one solenoid is actuated, its opposed spring is stretched so that energy is stored therein. Then when the other solenoid is actuated, and the first solenoid is released, the energy in the spring acts to bias the arm and the print head to its new position.
  • FIGS. 1-1A jointly show a front elevation of the machine embodying the invention.
  • FIG. 2 is a left side elevational view of the machine.
  • FIG. 3 is a plan view of the power reed and associated magnets as viewed along line 33 of FIG. 2.
  • FIG. 4 is a right side elevation of the printing unit.
  • FIG. 5 is a top sectional view taken along the line 5-5 of FIG. 4.
  • FIG. 7 is a cross section elevation of the same taken on line 7-7 of FIG. 6.
  • FIG. 8 is an enlarged fragmentary plan view of the printing drum and aligner means therefor.
  • FIGS. 99A and 10 are graphic illustrations of an operation of the power device.
  • the machine embodying the present invention comprises left and right side frames 1 and 2 having supported for rotation therein a non-shiftable work support platen 3. Forwardly within said frames is secured a transverse rod 4, while rearwardly of rod 4 said frames support a rail 5, which together serve to support for transverse movement a shiftable carriage C having mounted thereon the character printing drum 6, as hereinafter described.
  • a flexible steel tape 8 Secured to the left side of said carriage by means of stud 7 is a flexible steel tape 8 which passes first around a pully wheel 9 pivotally mounted upon a bracket 10 fast to the left side frame 1, then across the front of the machine and around a pully wheel 11 rotatably supported upon bracket 12 secured to the right side frame 2, and subsequently is wound upon the drum 13 fast to the shaft 14 of a stepping motor 15.
  • a second drum 16 Fast also to motor shaft 14 is a second drum 16 on which is wound a similar tape 17, which passes around a pulley wheel 18 and is secured to the right side of the printing carriage C by means of stud 19.
  • motor 15 serves to displace printing carriage C selective distances either to the right or to the left.
  • Printing carriage C comprises a support frame 20 (FIGS. 4-7) the forward end of which. is slidable upon the rod 4 and the rearward end having rollers 21 for riding along the rail 5.
  • Frame 20 is provided with a pair of upwardly extending trunnions 22 for receiving the pivot studs 23 fast within the bifurcated arms 24 forming the lower end of a U-shaped frame 24.
  • Within the upper arm 24" of said frame is bearinged for rotation the upper portion of a shaft 25 upon which is fast the character or printing drum 6.
  • drum 6 and shaft 25 may be a single piece, for instance, of molded nylon material.
  • shaft 25 is enlarged to form a socket for receiving the ball-shaped end 26 of a shaft 27 extending upwardly from a stepping motor 28 supported to the underside of the printing carriage frame 20.
  • a pin 29 extends through ball 26 and is received by an elongated vertical slot 30 in the lower end of the printing drum shaft 25, whereby to effect drive connection thereof with the motor shaft 27 in manner to permit an upward and downward movement of the printing drum.
  • a pair of spaced rearwardly extending levers 31 are each pivotally mounted at 32 upon an upwardly extending portion 20' of the carriage frame 20.
  • the rearward ends of each lever 31 are bifurcated to embrace the top and bottom sides of an enlarged circular disc 33, comprising a shoulder on the shaft 25.
  • a metal block 34 mounted to extend between the pair of arms 31 for movement therewith, is a metal block 34 which said arms serve as an armature between two opposed magnets 35, 36 supported upon the frame portion 20' of the printing carriage C.
  • a pair of balanced springs 37-37 will act to hold levers 31 and thereby the printing drum 6 at substantially a midpoint position relative to bringing one or the other of two rows of printing characters arranged around the circumference of drum 6 to the printing line with respect to platen 3. It is intended, however, that either magnet shall remain normally energized in accordance with any previous final impulse signal transmitted thereto from the known input devices.
  • This arrangement of spring balancing and with providing caps 38 of suitable anti-magnetic material, such as tetrafluoroethylene, commonly known as Teflon, upon the core of each magnet serves to provide for a more rapid response of the above devices to any said input impulse signals thereto.
  • suitable anti-magnetic material such as tetrafluoroethylene, commonly known as Teflon
  • a selection of any desired character to be printed is effected through selective forward or reverse operations of stepping motor 28 to adjust drum 6 from any last previous character selection position to any other character position according to the particular input signals received thereto from the master control devices.
  • a pair of springs 61 each at one end, being connected to the related arm 47, 48, respectively, and at their other end to a rod 62, held in a suitable notch in the rearward face of shoulders 45, 46, serves to yieldably bias said arms against the forward surface of said shoulders.
  • the forward end of block 44 is bifurcated to form upper and lower bearing support for a shaft 53 upon which is mounted for rotation between said supports a pulley wheel 54.
  • a flexible steel tape 55 is secured by stud 56 to the fixed bracket 12 of the machine and extends leftwardly, around the forward surface of pulley wheel 43, thereafter rearwardly around the pulley 54, forwardly around pulley 42 and again leftwardly to pass around a stationary pulley 57 and thence is secured at its opposite end to the distal end of a resilient reed 58 (FIGS. 2 and 3), having the opposite end thereof fast to the base plate 59'.
  • Said reed comprises the armature member for a pair of parallel electromagnets 60 fast to the base plate 59, and is designed to effect a printing operation of the drum in the following manner.
  • Magnets 60 may thereafter be deenergized and reenergized according to an established impulse repetition rate as transmitted thereto from any well-known control devices. So that any residual magnetism in magnets 60 will not delay a release of the reed 58, the side of said reed towards magnets 60 is covered with a suitable antimagnetic substance, such as for instance, tetrafluoroethylene and known commonly under the name Teflon.
  • a suitable antimagnetic substance such as for instance, tetrafluoroethylene and known commonly under the name Teflon.
  • reed 58 acts like a leaf spring, it tends to resonate but is restricted to one cycle, that is, it leaves the magnets 60 as said magents are deenergized and pulls tape 55 on a forward stroke, or away from the magnets.
  • said reed is recaptured by magnets 60 when energized, as hereinafter described, by a control circuit applied to said magnets at a given time before the reed has fully returned and which builds up the magnetic field sufficiently to pull reed 58 a remaining short distance to normal, whereby the associated parts operated by tape 55 also return to normal, with a minimum of chatter or rebound.
  • FIG. 9 illustrates the force applied by magnets 60 for deflecting power reed 58 incident to an initial potential energy storing stroke for said reed and as related to the required force of said magnets for any subsequent deflections of the reed.
  • the low current magnetic force curve will intercept the force line R, requirement for the reed at substantially the line +D and will fall below the designed reed force R along a substantial portion of said line R.
  • the kinetic energy of the moving reed is being utilized during this time portion, and a reduced power is therefore possible for magnets 60 to return reed 58 the remaining short gap represented by line +D' to +D and restore full potential energy to said reed.
  • more latitude is permissible in the timing for reenergizing of said magnet.
  • FIG. is a sinusoidal wave chart, relating the velocity curve of the reed 58 with a time displacement curve thereof and indicating the manner in which the reed becomes self-cushioning in the printing oscillation thereof and how the shock, earlier described, is minimized in the operations of the reed.
  • FIG. 10 with FIG. 9A illustrates how the reed power means functions to operate the printing devices in a given time sequence with any input repetition rate from the master control devices.
  • reed 58 will be held by said magnets at its maximum potential nergy shown at +D on the y coordinate.
  • the reed being stationary is so illustrated at zero velocity (ZERO VEL.) on the conjunction of coordinates xy.
  • ZERO VEL. zero velocity
  • the reed advances to zero deflection point A on the reed displacement curve.
  • the reed has attained maximum velocity as indicated on the velocity curve.
  • Reed 58 now reverses its force as it moves beyond point A to point D during which the velocity curve will again go to zero.
  • magnets 60 are caused to be deenergized each time for releasing a power reed 58 to effect by said reed successive printing operations and that said magnets are timed by known circuit control devices to be reenergized in a timed sequence with such input signals so as to complete the restoring of potential energy again within reed 58 in corresponding time for each subsequent release thereof.
  • Suitable well-known feed back circuits may be included where required to control timing starts for any input signal to the printer from the master control means.
  • a printing mechanism comprising a print head having first and second] rows of indicia thereon alternatively alignable with a printing position;
  • said arm engaging said shaft to shift said shaft and thereby said print head to a first position wherein a first set of indicia is aligned with the printing position and a second position wherein the second set of indicia is aligned with the printing position;
  • a first electromagnetic means positioned adjacent to said arm and adapted to move said arm about said axis;
  • a second electromagnetic means positioned adjacent to said second side of said arm and adapted to move said arm about said axis;
  • spring means biasing said arm to midpoint position between said first and second electromagnetic means and adapted to have potential energy stored therein upon movement of said arm;
  • said spring means coacting with said first means to release potential energy stored in the spring to cause movement of said arm about said axis to thereby cause said print head to move between said first position and said second position.
  • second spring means is provided, which spring means is connected to said arm adjacent said second side thereof, and wherein said second spring means is adapted to have potential energy stored therein upon movement of said arm, and wherein said second spring means coacts with said second electromagnetic means to release the potential energy stored in the spring to cause movement of said arm about said axis and thereby cause the print head to move between said second position and said first position.
  • said axis is positioned between said first and second ends and between said first and second sides.
  • first and second electromagnetic means comprise electromagnets which are adapted to be energized and deenergized and wherein said first spring means and said second biasing means comprise tension springs.
  • said first and second set of indicia comprises parallel bands of print symbols.
  • a shoulder is provided on said shaft, which shoulder is engaged by said arm to interconnect the arm and the print head.
  • said shoulder being a flat projecting member having a first and second surface and being positioned in a plane perpendicular to said shaft, said arm having a first and second spring finger projecting therefrom, said shoulder being engaged between said spring fingers so that said first surface is engaged by the first spring finger and said second surface is engaged by said second spring finger, whereby said shoulder and said shaft are adapted to tiltably move in an arc, to slideably move vertically and to move rotationally while being engaged by said fingers.

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  • Character Spaces And Line Spaces In Printers (AREA)
US717845A 1968-04-01 1968-04-01 Print head shift mechanism Expired - Lifetime US3493091A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71784568A 1968-04-01 1968-04-01

Publications (1)

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US3493091A true US3493091A (en) 1970-02-03

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Application Number Title Priority Date Filing Date
US717845A Expired - Lifetime US3493091A (en) 1968-04-01 1968-04-01 Print head shift mechanism

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US (1) US3493091A (de)
BE (1) BE730753A (de)
DE (1) DE1915926A1 (de)
FR (1) FR2005326A1 (de)
NL (1) NL6905011A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3739897A (en) * 1970-12-01 1973-06-19 Honeywell Inf Systems Internal actuator for impacting a serial printer print head
US3761880A (en) * 1972-03-03 1973-09-25 Computer Transceiver Systems Variable speed printer
US3778777A (en) * 1971-01-12 1973-12-11 Bosch Gmbh Robert High-speed print-out arrangement using continuously rotating step motor
US3876053A (en) * 1972-01-13 1975-04-08 Olivetti & Co Spa Serial printing device
US3951061A (en) * 1974-05-17 1976-04-20 Custom Printers, Inc. Label printing apparatus
US4306817A (en) * 1979-11-05 1981-12-22 International Telephone And Telegraph Corporation Bar code printing mechanism
WO1985003255A1 (en) * 1984-01-20 1985-08-01 Varitronic Systems, Inc. Print disk positioning system

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US485761A (en) * 1892-11-08 Machine
US1083076A (en) * 1910-04-26 1913-12-30 Oskar Fischer Type-writing machine.
US1355089A (en) * 1920-10-05 Electeic typewriter
US1736683A (en) * 1927-12-10 1929-11-19 Claude S Wakeland Switch
US1936656A (en) * 1931-09-01 1933-11-28 Bell Telephone Labor Inc Printing telegraph system
US2029957A (en) * 1929-01-26 1936-02-04 Trachtenberg Jakow Electrical multiple typewriter
US2633488A (en) * 1948-04-16 1953-03-31 Honeywell Regulator Co Electromagnetic relay
US3286806A (en) * 1964-09-16 1966-11-22 Olympia Werke Ag Rotatable and tiltable type head control apparatus
US3291041A (en) * 1963-07-24 1966-12-13 Soroban Engineering Inc Page printer mechanism with tilting and travelling print head

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US485761A (en) * 1892-11-08 Machine
US1355089A (en) * 1920-10-05 Electeic typewriter
US1083076A (en) * 1910-04-26 1913-12-30 Oskar Fischer Type-writing machine.
US1736683A (en) * 1927-12-10 1929-11-19 Claude S Wakeland Switch
US2029957A (en) * 1929-01-26 1936-02-04 Trachtenberg Jakow Electrical multiple typewriter
US1936656A (en) * 1931-09-01 1933-11-28 Bell Telephone Labor Inc Printing telegraph system
US2633488A (en) * 1948-04-16 1953-03-31 Honeywell Regulator Co Electromagnetic relay
US3291041A (en) * 1963-07-24 1966-12-13 Soroban Engineering Inc Page printer mechanism with tilting and travelling print head
US3286806A (en) * 1964-09-16 1966-11-22 Olympia Werke Ag Rotatable and tiltable type head control apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3739897A (en) * 1970-12-01 1973-06-19 Honeywell Inf Systems Internal actuator for impacting a serial printer print head
US3778777A (en) * 1971-01-12 1973-12-11 Bosch Gmbh Robert High-speed print-out arrangement using continuously rotating step motor
US3876053A (en) * 1972-01-13 1975-04-08 Olivetti & Co Spa Serial printing device
US3761880A (en) * 1972-03-03 1973-09-25 Computer Transceiver Systems Variable speed printer
US3951061A (en) * 1974-05-17 1976-04-20 Custom Printers, Inc. Label printing apparatus
US4306817A (en) * 1979-11-05 1981-12-22 International Telephone And Telegraph Corporation Bar code printing mechanism
WO1985003255A1 (en) * 1984-01-20 1985-08-01 Varitronic Systems, Inc. Print disk positioning system
US4544289A (en) * 1984-01-20 1985-10-01 Varitronic Systems, Inc. Print disk positioning system

Also Published As

Publication number Publication date
FR2005326A1 (de) 1969-12-12
DE1915926A1 (de) 1969-10-23
BE730753A (de) 1969-09-01
NL6905011A (de) 1969-10-03

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Legal Events

Date Code Title Description
AS Assignment

Owner name: TRIUMPH-ADLER NORTH AMERICA, INC., 500 DAY HILL RO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ROYAL BUSINESS MACHINES, INC.;REEL/FRAME:004509/0292

Effective date: 19860110

AS Assignment

Owner name: TRIUMPH-ADLER AG, FURTHER STRASSE 212, POSTFACH 49

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TRIUMPH-ADLER NORTH AMERICA, INC.,;REEL/FRAME:004587/0403

Effective date: 19860730

AS Assignment

Owner name: TA TRIUMPH-ADLER AKTIENGESELLSCHAFT, GERMANY

Free format text: RE-RECORD OF AN INSTRUMENT RECORDED AUG. 4, 1986 AT REEL 4587, FRAMES 403 TO CORRECT THE NAME OF THE ASSIGNEE;ASSIGNOR:TRIUMPH-ADLER NORTH AMERICA, INC.;REEL/FRAME:004746/0570

Effective date: 19860730

Owner name: TA TRIUMPH-ADLER AKTIENGESELLSCHAFT, FURTHER STRAS

Free format text: RE-RECORD OF AN INSTRUMENT RECORDED AUG. 4, 1986 AT REEL 4587, FRAMES 403 TO CORRECT THE NAME OF THE ASSIGNEE.;ASSIGNOR:TRIUMPH-ADLER NORTH AMERICA, INC.;REEL/FRAME:004746/0570

Effective date: 19860730