US3776131A - Printer - Google Patents

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Publication number
US3776131A
US3776131A US00284681A US3776131DA US3776131A US 3776131 A US3776131 A US 3776131A US 00284681 A US00284681 A US 00284681A US 3776131D A US3776131D A US 3776131DA US 3776131 A US3776131 A US 3776131A
Authority
US
United States
Prior art keywords
typebar
projection
printing
typewheel
printer according
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
US00284681A
Other languages
English (en)
Inventor
T Ochiai
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.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co Ltd
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 Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Application granted granted Critical
Publication of US3776131A publication Critical patent/US3776131A/en
Anticipated expiration legal-status Critical
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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/42—Hammer-impression mechanisms with anti-rebound arrangements
    • 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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/32—Means for operating hammers to effect impression arranged to be clutched to snatch roll

Definitions

  • the typewheel is made with raised characters on its periphery and rotates at constant speed.
  • the typebar is rockably supported on a shaft and has a portion for striking a selected character through paper, etc. in its printing position.
  • the position determining device is associated with the typebar to swing it from the rest position to the driving position.
  • the typebar in its driving position is impulsively rocked by engaging a hammer rotating in synchronism with the typewheel, and then returns to its rest position.
  • the typebar in its rest position engages the position determining device without rocking so as to prevent double or repeated printing.
  • an object of the present invention is to provide an improv'edprinter ofhigh reliability, low cost and simple construction.
  • This invention providesa printer comprisinga type? wheel-made with raised characters onits periphery, and
  • atypebar withaxprintinghead forprinting a-selected character oniazmaterialto be printed, such.as paper, throughaninkedf ribboniadevice for determining two different positions of' the. typebar, arest position taken whenxsaid printing head is detached from the, periphery. of the.:typewheel; and a driving position occupiedwhen' saidr printing; head comes beyond the rest. position; a driving means for causing said printing head to strike the selected character on the paper through an inkedribbon byvimpul sively driving said typebar'when saidl'printinglieadis ine the driving position" of the typebar; characterized? in".
  • 1 i BRIEFDESCRIPTION OF THE DRAWING 'FIG. 1 is a side view of a printer in .the-restzposition of the typebar according to this'invention;
  • FIG. 2 is a side view showing -the.printer:of2FIG. lsin the driving position of the typebar;
  • -'FIG.'3 is aside view illustrating the printenofiF-IG. 1
  • FIG. 4 is va side view representing a :modifiedxprinter:
  • FIG. l is shown a typewheel 2 -.which'is made with raised characters 1 on its periphery-and connected to a motor.(not shown) and rotated.counterclockwise:..at
  • A-typebar 6tisisupportedito swing around a'shaft:5.
  • a printing headflismounted ataone free. end of the typebars6-to strikea selected character on the-paper 3 through an inked ribbonx4:
  • a first projection 9 with: aarectangular .:head. is formed at the other end of thetypebar 6soas toengage the first and second engaging .portions ;-1 2i iand- 1350f 5a..
  • the pro jection 9 engages with the first portion 12 in the driving position of the typebar 6,-as shown in FIG. 2. It also engages with the second portion 13 in the rest position of the typebar 6, as shown in FIG. 1.
  • the second-portion 13 has a recess somewhat wider than the head of the first projection 9.
  • a step 15 is formed between the-second portion 13 and one free end 14 of the trigger lever 11. The'distance from the step 15 to the bottom of therecess of the second portion. '13 is somewhat shorter than the distance between the first and second engaging portions at bottom.
  • a spiral spring 16 is used to normally swing the trigger lever 11 counterclockwise around the shaft 10.
  • a predetermined swinging position is given to the trigger lever 11 so as to cause a stopper pin 17 to engage the third engaging portion 18 of the lever-11. in the rest position of the typebar .6, as shownin FIG. 1.
  • a slit 19 is formed at one free end of thelever 11.
  • the lever 11 is connected to the free end of-an armature 22 of a printing solenoid 21 through a link 20 one end of which isconnected to the slit 19.
  • The-solenoid 21 is de-energized in the rest position of thetypebar 6 shown in FIG. 1.
  • the armature 22 is sepa rated from a solenoidcore 23 by the action of the spring 16.
  • a pressure arm 24 projects almost perpendicular to thefree end portion 14 of the lever 11. Facing the arm 24, asecond projection 25 is formed in the typebar 6.
  • This shape of the lever 1 l contributes much to the miniaturization of the printer.
  • the tip of the arm 24 slidably contacts the second projection 25 in the printing positionof the typebar 6 shown in FIG. 3.
  • vAn impulse arm 26 projects on the opposite side of the typebar 6 with respect to the printing head 7.
  • a rotating printhammer 27 is disposed near the tip of the arm 26.
  • the hammer 27 is connected to the typewheel 2 through a gearing (not shown) and driven at constant 'speedcounterclockwise around a shaft 28 in synchronism with the typewheel 2 at a predetermined turning ratio.
  • On the periphery of the hammer 27 are formed two strikingportions 29 which are symmetrical with respect to the shaft 28.
  • the striking portion 29 strikes against the arm 26 and impulsively rocks the typebar 6 counterclockwisev against theaction of the spring 8.
  • the hammer 27 is set at a half turn while the typewheel 2 rotates by one char-' acter. For example, when the typewheel 2 is made with l4 raised characters-on its periphery, the hammer 27 has seven rotations per rotation of the typewheel 2.
  • the first projection 9 is positioned on the step 15 directly from the first engaging portion 12 without engaging the second portion 13 in the displacement from the driving position to the printing position of the typebar 6. In such a state, the tip of the pressure arm 24 of the lever 11 is in close contact with the second projection 25 of the typebar 6.
  • the typebar 6 swings clockwise from its printing position shown in FIG. 3 by the reaction of the strike and under the tension of the spring 8.
  • the first projection 9 securely inserts into the second portion or recess 13 by sliding along the step 15 because the first portion 12 is higher than the step 15 with respect to the bottom of the second position 13.
  • the pressure arm 24 which contacts the second projection 25 by sliding is forced to act so as to cause the trigger lever 11 to swing counterclockwise as the typebar rocks clockwise.
  • the lever 1 1 is compelled to more counterclockwise in conjunction with the tension of the spring 16 even when a clockwise force is imparted to the lever 11 before the typebar 6 returns to its rest position by energizing the solenoid 21 due to the residual magnetic field and/or a misprint signal.
  • the lever 11 swings one way (counterclockwise), thus preventing double or repeated printing.
  • FIG. 4 illustrates a modified embodiment of the invention.
  • an eccentric stopper 30 is associated with the typebar 6 in its printing position (FIGS. 1 to 3) to adjust the angular position of the typebar 6 in its driving position, that is, the position taken when the striking portion 29 of the hammer 27 contacts the impulse arm 26 of the typebar 6 or an angle )8 between a line connecting a point of contact P between the striking portion 29 and arm 26 and the center of the shaft and a line connecting the point P and the center 0 of the shaft 28.
  • the energy imparted to the typebar 6 by the rotating hammer 27 can thus be adjusted so as to regulate the printing strength of the head 7 per character.
  • the printing 1 strength is increased with increasing hammer rotation speed and decreased with decreasing hammer rotation speed, where the angular position of the typebar6 is fixed.
  • the damage inflicted on paper 3, ambiguous printing, and misprints can thus be prevented by adjusting the printing strength.
  • the velocity of the typebar 6 at the point P is v.cosB, where v is the velocity of the hammer 27 at P. If 0) denotes the angular velocity of the typebar 6 and FT), denotes the distance between P and Q, the following relationship exists:
  • FIGS. 1 to 4 designate the same parts. For the sake of brevity, the construction and operation of the printer shown in FIG. 4 are omitted here.
  • a printer comprising:
  • a typewheel (2) having characters formed on its pe riphery and rotating at a substantially constant speed
  • a driving means for impulsively driving said typebar (6) toward said typewheel (2) when said printing head (7) is in the driving position of the typebar so as to cause said printing head (7) to strike a selected character on the paper through an inked ribbon;
  • said position defining device comprises a first projection (9) fdrmed on said typebar (6), a movable trigger lever (11) having first (12) and second (13) engaging portions respectively engageable with said first projection (9) in the driving (FIG. 2) and rest (Fl 1) positions of the typebar (6), and said second engaging portion (13) including a recess into which said first projection (9) is selectively received after a printing operation to prevent said typebar (6) from moving toward said typewheel (2) arid causing undesired double printing.

Landscapes

  • Impact Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Common Mechanisms (AREA)
US00284681A 1971-08-31 1972-08-29 Printer Expired - Lifetime US3776131A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971078474U JPS5219614Y2 (de) 1971-08-31 1971-08-31

Publications (1)

Publication Number Publication Date
US3776131A true US3776131A (en) 1973-12-04

Family

ID=13663001

Family Applications (1)

Application Number Title Priority Date Filing Date
US00284681A Expired - Lifetime US3776131A (en) 1971-08-31 1972-08-29 Printer

Country Status (3)

Country Link
US (1) US3776131A (de)
JP (1) JPS5219614Y2 (de)
DE (1) DE2242771C3 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59147783A (ja) * 1983-02-14 1984-08-24 Hitachi Ltd 溶接装置の漏電流防止方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2625100A (en) * 1947-07-24 1953-01-13 Ncr Co Printing hammer rebound preventing means
US2796966A (en) * 1953-09-08 1957-06-25 Ibm Type element driving mechanism
US2949846A (en) * 1958-03-28 1960-08-23 Burroughs Corp Printing mechanism
US3266419A (en) * 1964-08-11 1966-08-16 Navigation Computer Corp High speed impact print hammer assembly with resilient energy storing means
US3292531A (en) * 1964-11-28 1966-12-20 Kienzle Apparate Gmbh Printing hammer arrangement
US3670647A (en) * 1969-11-20 1972-06-20 Burroughs Corp Method of damping rebound of print hammer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2625100A (en) * 1947-07-24 1953-01-13 Ncr Co Printing hammer rebound preventing means
US2796966A (en) * 1953-09-08 1957-06-25 Ibm Type element driving mechanism
US2949846A (en) * 1958-03-28 1960-08-23 Burroughs Corp Printing mechanism
US3266419A (en) * 1964-08-11 1966-08-16 Navigation Computer Corp High speed impact print hammer assembly with resilient energy storing means
US3292531A (en) * 1964-11-28 1966-12-20 Kienzle Apparate Gmbh Printing hammer arrangement
US3670647A (en) * 1969-11-20 1972-06-20 Burroughs Corp Method of damping rebound of print hammer

Also Published As

Publication number Publication date
JPS4835242U (de) 1973-04-27
JPS5219614Y2 (de) 1977-05-06
DE2242771B2 (de) 1977-09-29
DE2242771A1 (de) 1973-03-08
DE2242771C3 (de) 1978-06-01

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