US2990767A - Chain printer - Google Patents

Chain printer Download PDF

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Publication number
US2990767A
US2990767A US704938A US70493857A US2990767A US 2990767 A US2990767 A US 2990767A US 704938 A US704938 A US 704938A US 70493857 A US70493857 A US 70493857A US 2990767 A US2990767 A US 2990767A
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US
United States
Prior art keywords
drum
hammers
bands
hammer
voltage
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
US704938A
Other languages
English (en)
Inventor
Frederick M Demer
Richard H Harrington
Alex T Shalkey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL234516D priority Critical patent/NL234516A/xx
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US704938A priority patent/US2990767A/en
Priority to FR781277A priority patent/FR1222524A/fr
Priority to DEI15777A priority patent/DE1145405B/de
Priority to GB4135558A priority patent/GB858410A/en
Priority to GB3266460A priority patent/GB861776A/en
Application granted granted Critical
Publication of US2990767A publication Critical patent/US2990767A/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
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/32—Means for operating hammers to effect impression arranged to be clutched to snatch roll

Definitions

  • This invention relates to printing mechanisms and more particularly to printers in which a plurality of hammer means are adapted to be actuated selectively to strike type characters mounted for movement in a continuous ath.
  • Another object of the invention is to provide new and improved printer mechanism of the above character which is adapted for use with high speed electronic control systems.
  • a further object of the invention is top-rovide new and improved printer mechanism of the above character in which characters are printed in a line on a record medium at high speed.
  • FIG. 1 is a schematic diagram of typical printer mechanism constructed according to the invention
  • FIG. 2 is a partial rear view in perspective showing how the respective hammer means are coupled to the electrostatic clutch;
  • FIG. 3 illustrates one way of energizing the electrostatic clutch to actuate the type hammers selectively
  • FIG. 4 is 'a graph illustrating how a circuit of the type shown in FIG. 3 might be controlled to operate printing mechanism as in FIGS. 1 and 2.
  • a typical-printer mechanism comprises an endless belt supported on spaced apart rollers 11 and 12 and having mounted thereon a plurality of type members 13 each of which carries a number of type characterson a plate 14 on one side thereof.
  • On the other side of each type member 13 are formed a plurality of'teeth 15 equal in number to the type characters and having the same spacfnited States Patent ice ing therebetween.
  • the teeth 15 are adapted to be sensed by a plurality of spaced apart magnetic pickup heads 16 and 17 to provide timing signals for use in the control of the machine.
  • the belt also carries another magnetic member 19 which is adapted to be sensed by a magnetic pickup head 18 to provide a unique signal each time a predetermined type character on the belt is in the correct position to be struck by a predetermined one of the hammers described below.
  • the belt 10 is adapted to be driven by conventional motive means 20 through the gearing 21 and shaft 22.
  • the type members 13 on the belt 10 are adapted to be moved transversely of a record strip 23 which passes under and'over guide members 24 and 25, respectively, and is adapted to be advanced intermittently in the usual manner by lower sprockets 26 and upper sprockets 27.
  • the lower sprockets 26 are adapted to be driven by conventional motive means 28 and are also coupled in driving relation to the sprockets 27 by a belt 29 mounted on rollers 30 and 31 carried by shafts 32 and 33, respectively.
  • Printing of characters on the record strip 23 is adapted to be effected by a plurality of hammers 34 -34 respectively, rotatably mounted on a common shaft 35.
  • the hammers 34 -34 respectively are normally maintained away from the record strip 23 by spring means 36 -36 inclusive, as shown in FIGS. 1 and 2.
  • an inked ribbon 37 Interposed between the row of hammers 34 -34 and the record strip 23 is an inked ribbon 37 which is adapted to be advanced from a supply spool 38 and through a guide member 39 by a take-up spool 40 mounted on the shaft 32 which carries the roller 30.
  • the hammers 34 -34 are adapted to be actuated by an electrostatic clutch mechanism 41 comprising -a high resistance composition drum 42 having a dielectric lubricant such as silicone oil or the like on the peripheral surface thereof.
  • the drum 42 is adapted to be driven continuously by motivepleans 43.
  • Each of the hammers 34 34 has a lever arm 44 -44 to which is secured a narrow metal band 45 -45 which passes over the drum 42 and is retained by spring means 46 -46 secured to a member 46a.
  • the metal bands 45 -45 are maintained out of engagement with the face of the drum 42 by a plurality of spacer members 47, 48 and 49 which are made of insulating material and are supported on the shaft 50 of the motor 43 for relative rotation with respect thereto.
  • the spacer members 47, 48 and 49 are removed so that all of the bands 45 -45 are in sliding engagement with the drum 42. Without the spacer members, the bands would stick to the drum when the drum was at rest and make it difficult to start the mechanism.
  • the spacer members 47 and 48 are provided with arcuate openings 51 and 52, respectively, through which is adapted to pass a rod 53 secured to the spacer member 49 and to a gear 54 also mounted on the shaft 50 for rotation with respect thereto.
  • the gear 54 engages a toothed sector '55 which is pivotally mounted on a shaft 56 and is adapted to be rotated by a solenoid 57 through a linkage 58.
  • the printing mechanism shown in FIGS. 1 and 2 is adapted to be operated in conjunction with an electronic control system which forms no part of the invention, and, therefore, need not be described in detail herein. Suffice it to say that the control system is synchronized with the printer mechanism through the signals induced in the mag netic .pickup devices 1'6, 17 and .18 and during part of its cycle of operation is adapted to establish a potential difference between the drum 42 and any one of the metal bands 45 -45, corresponding to hammers that are required to be actuated.
  • a clutch control circuit of the type shown in FIG. 3, one of which is provided for each of the hammers 34 -34 in the machine of FIGS. 1 and 2. It comprises a conventional gas discharge tube 59, preferably a thyratron, having an anode 60, a. shield grid 61, a control grid 62 and a cathode 63.
  • the anode 60 is connected by a unilaterally conductive device 64 and a conductor 65 to the band 45
  • the band 45 is connected through a resistor 66 to a conductor 67 which supplies signal voltage to the drum 42.
  • the graphs shown in FIG. 4 illustrate a typical operating cycle for each of the control circuits of FIG. 3 in the printing machine of FIGS. 1 and 2.
  • a voltage of say 200 volts is applied to the anode 60 of each of the thyratrons 59 through the resistor 68.
  • a high shield grid voltage is also applied to the shield grids 61 of all the thyratrons.
  • Any thyratrons that are to be fired also receive a signal at the control grid 62 and are thereby caused to become conducting.
  • the voltage at the point A (FIG. 3) will drop from 200 volts to approximately 12 volts for all thyratrons fired.
  • the voltage values of either 200 volts for unfired thyratrons or 12 volts for fired thyratrons at point A is isolated from the bands 45 -45 and from the rotor 42 by the back resistance of the unilaterally conductive device.
  • any band that has been energized and has a potential difference with respect to the drum 42 will now be drawn tightly against the drum 42 which in its rotation will apply tension to the corresponding metal band to actuate the corresponding hammer, and each hammer is actuated by a uniform force due to uniformity in frictional engagement of the respective bands.
  • the solenoid 57 is deenergized permitting the spring 59 to return the spacer members 47, 48 and 49 to their initial positions where they maintain the metal bands 45 -45,, in spaced relationship to the drum 42.
  • the spacer members 47, 48 and 49 in moving between the metal bands 45 --45 and the drum operate to break the frictional engagement between the bands and the film of the drum.
  • 120 hammers 34 -34 may be disposed behind the record strip 23.
  • the drum 42 of the electrostatic clutch 41 may be approximately 2 /2 inches in diameter and as wide as the print line.
  • the drum speed may be approximately 800 to 900 rpm, the hammer firing time at this speed being between 500 and 600 microseconds.
  • the invention thus provides novel and highly effective printer mechanism for selectively actuating a plurality of hammer means to strike type characters mounted for movement in a continuous path.
  • electrostatic clutch means to actuate the several hammers as described above, the structure is relatively simple and inexpensive yet enables very high speeds of operation to be achieved.
  • printer mechanism the combination of a plurality of hammers disposed side by side in linear array and pivotally mounted for rotation about a common axis, resilient means normally maintaining said hammers in retracted position, a rotatable drum having an axis parallel to the axis of rotation of said hammers, and having a circumferential surface providing a condenser plate electrode and operably covered with a dielectric lubricant, means to continuously rotate said drum, a linear array of linkages of which each is connected at one end to a respective hammer and at the other end to a fixed point, and of which each has between its ends a portion wrapped around a portion of the circumference of said drum, a plurality of flexible electro-conductive metal bands of which each forms the wrapped portion of a respective one of said linkages, and of which each provides a condenser plate electrode closely spaced to said drum surface, whereby said surface, dielectric lubricant and each band form a separate condenser respective to that band, resilient means adapted by contracting

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US704938A 1957-12-24 1957-12-24 Chain printer Expired - Lifetime US2990767A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL234516D NL234516A (de) 1957-12-24
US704938A US2990767A (en) 1957-12-24 1957-12-24 Chain printer
FR781277A FR1222524A (fr) 1957-12-24 1958-12-10 Mécanisme d'impression
DEI15777A DE1145405B (de) 1957-12-24 1958-12-18 Kettendrucker fuer datenverarbeitende Maschinen
GB4135558A GB858410A (en) 1957-12-24 1958-12-22 Improvements in and relating to printing apparatus
GB3266460A GB861776A (en) 1957-12-24 1958-12-22 Improvements in and relating to printing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US704938A US2990767A (en) 1957-12-24 1957-12-24 Chain printer

Publications (1)

Publication Number Publication Date
US2990767A true US2990767A (en) 1961-07-04

Family

ID=24831461

Family Applications (1)

Application Number Title Priority Date Filing Date
US704938A Expired - Lifetime US2990767A (en) 1957-12-24 1957-12-24 Chain printer

Country Status (4)

Country Link
US (1) US2990767A (de)
DE (1) DE1145405B (de)
FR (1) FR1222524A (de)
NL (1) NL234516A (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131627A (en) * 1961-03-30 1964-05-05 Scm Corp High speed serial printer
US3135195A (en) * 1961-06-22 1964-06-02 Potter Instrument Co Inc High speed printer with moving characters and single hammer
US3164084A (en) * 1962-01-18 1965-01-05 Burroughs Corp High speed belt printer with internal hammer
US3185079A (en) * 1961-09-22 1965-05-25 Control Data Corp Belt and gear drive for high speed printer systems
US3220343A (en) * 1960-11-25 1965-11-30 Potter Instrument Co Inc High speed printers with column spanning hammers
US3233540A (en) * 1961-11-17 1966-02-08 Int Standard Electric Corp Line-at-a-time printer
US3279365A (en) * 1964-05-15 1966-10-18 Invac Corp High speed belt printer with comparison means
US3289576A (en) * 1964-12-02 1966-12-06 Ibm High speed printer with variable cycle control
US3310146A (en) * 1964-09-11 1967-03-21 Marconi Co Ltd Belt mounted printer hammers movable by shortest distance to indexed position
US3331317A (en) * 1964-05-19 1967-07-18 Sperry Rand Corp High speed bar printer
US3402657A (en) * 1965-11-24 1968-09-24 Potter Instrument Co Inc High speed belt printer with printing slug supporting means
US3420164A (en) * 1964-12-23 1969-01-07 Int Computers Ltd Cyclically operable printing and proportional spacing apparatus
US3444975A (en) * 1963-03-20 1969-05-20 Rca Corp Printer with print bars supported by parallelogram linkage arrangement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686470A (en) * 1952-04-16 1954-08-17 Florez Company Inc De Hammer impelling means for high-speed printers
US2766686A (en) * 1953-06-11 1956-10-16 Hughes Aircraft Co High speed electro-mechanical interference-type transducer
US2831424A (en) * 1954-03-01 1958-04-22 Burroughs Corp Traveling type carriage in high speed printers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE472151C (de) * 1929-02-25 Tabulating Machine Company Durch Lochkarten gesteuerte Tabelliermaschine
FR927344A (de) * 1943-04-21 1947-11-04
US2692551A (en) * 1950-05-26 1954-10-26 John T Potter High-speed rotary printer
US2695558A (en) * 1951-12-31 1954-11-30 Ibm Record card controlled printing mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686470A (en) * 1952-04-16 1954-08-17 Florez Company Inc De Hammer impelling means for high-speed printers
US2766686A (en) * 1953-06-11 1956-10-16 Hughes Aircraft Co High speed electro-mechanical interference-type transducer
US2831424A (en) * 1954-03-01 1958-04-22 Burroughs Corp Traveling type carriage in high speed printers

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220343A (en) * 1960-11-25 1965-11-30 Potter Instrument Co Inc High speed printers with column spanning hammers
US3131627A (en) * 1961-03-30 1964-05-05 Scm Corp High speed serial printer
US3135195A (en) * 1961-06-22 1964-06-02 Potter Instrument Co Inc High speed printer with moving characters and single hammer
US3185079A (en) * 1961-09-22 1965-05-25 Control Data Corp Belt and gear drive for high speed printer systems
US3233540A (en) * 1961-11-17 1966-02-08 Int Standard Electric Corp Line-at-a-time printer
US3164084A (en) * 1962-01-18 1965-01-05 Burroughs Corp High speed belt printer with internal hammer
US3444975A (en) * 1963-03-20 1969-05-20 Rca Corp Printer with print bars supported by parallelogram linkage arrangement
US3279365A (en) * 1964-05-15 1966-10-18 Invac Corp High speed belt printer with comparison means
US3331317A (en) * 1964-05-19 1967-07-18 Sperry Rand Corp High speed bar printer
US3310146A (en) * 1964-09-11 1967-03-21 Marconi Co Ltd Belt mounted printer hammers movable by shortest distance to indexed position
US3289576A (en) * 1964-12-02 1966-12-06 Ibm High speed printer with variable cycle control
US3420164A (en) * 1964-12-23 1969-01-07 Int Computers Ltd Cyclically operable printing and proportional spacing apparatus
US3402657A (en) * 1965-11-24 1968-09-24 Potter Instrument Co Inc High speed belt printer with printing slug supporting means

Also Published As

Publication number Publication date
FR1222524A (fr) 1960-06-10
NL234516A (de)
DE1145405B (de) 1963-03-14

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