US3630142A - Electromagnetic drive for print hammers - Google Patents

Electromagnetic drive for print hammers Download PDF

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Publication number
US3630142A
US3630142A US852653A US3630142DA US3630142A US 3630142 A US3630142 A US 3630142A US 852653 A US852653 A US 852653A US 3630142D A US3630142D A US 3630142DA US 3630142 A US3630142 A US 3630142A
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US
United States
Prior art keywords
armature
leg
armature means
operative position
transducer
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
US852653A
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English (en)
Inventor
Thomas C Fulks
Mushi Soraya
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.)
NCR Voyix Corp
National Cash Register Co
Original Assignee
NCR 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 NCR Corp filed Critical NCR Corp
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Publication of US3630142A publication Critical patent/US3630142A/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
    • B41J9/36—Means for operating hammers to effect impression in which mechanical power is applied under electromagnetic control

Definitions

  • FIG. 3a PATENTEO 112228 ml
  • transducer utilizes a permanent magnet means which is switched between first and second magnetic paths therein to make the transducer bistable.
  • the transducer is stable (that is, cocked) during a power ofi'" condition and does not consume power when idle, nor does it require resetting after a temporary interruption of power thereto, as holding coils require.
  • the switchingof the permanent magnet means between the first and second magnetic paths permits individual transducers to be assembled close to one another without interaction thereof. This is a very useful feature of the transducer when it is considered foruse in a print hammer module for a high-speed printer.
  • the transducer of this invention is simple in design economical to manufacture, and adaptable for a high-packing density necessary for print hammer modules of the type described. Because the transducer is bistable, it may be used as a binary memory device.
  • This invention relates to a transducer or actuator which may be used in a print column module for a high-speed printer.
  • the transducer includes a frame means and an armature means pivotally mounted thereon, with the armature means being movable between ready and operative positions.
  • Spring means are utilized to urge the armature means towards the operative position.
  • the armature means is releasably held in the ready position by a pennanent magnet means which produces first and second magnetic flux paths in cooperation with said armature means.
  • a coil means is utilized to momentarily reduce the flux density in the first flux path to permit the spring means to rotate the armature means towards operative position.
  • the rotation of the armature means towards the operative position is effective to switch the flux path from the first path to the second path, which is effective to hold the armature in the operative position until a mechanical restoring means is used to rotate the armature means against the bias of the spring means to return the armature means to the ready position.
  • FIG. I is a general perspective view of the transducer or actuator of this invention as used in combination with a ballistictype print hammer, the print hammer being shown in a ready," or home, position.
  • FIGS. 2a and 20 inclusive are side views in elevation showing an armature of the actuator in the process of striking the ballistic-type print hammer shown in FIG. 1.
  • FIGS. 30 and 3b are side views in elevation showing the armature of the actuator being returned to the "ready,” or home, position shown in FIG. 1.
  • FIG. I is a general perspective view of the transducer 10 of this invention in combination with a ballistic-type print hammer 12 to form a print column module for a high-speed printer having a rotating drum 14 with printing characters thereon.
  • the transducer 10 (FIG. I) includes a frame means 16, on which a generally planar permanent magnet means and armature means are mounted.
  • the permanent magnet means 18 is fixed to the frame means 16 and includes a first leg portion 20,
  • FIG. 2b the coil 42 is shown momentarily energized to permit therefrom along radial lines as shown.
  • the armature means 26 has a first leg 28 and a second leg 30 positioned generally perpendicular to each other, which legs extend from a center portion 32, which is pivotally joined to the frame means 16 by a pin 34.
  • the free end of the second leg 30 has one end of a tension spring 36 attached thereto, and the other end of the spring is attached to an extension 38 of the magnet means 18.
  • the tension spring 36 urges the armature means 26 to rotate clockwise as viewed in FIG. 1.
  • the armature means 26 is rotatable from a ready" position to an operative" position to strike the print hammer 12 as follows.
  • the permanent magnet means 18 has a permanent magnet 40 secured to its central leg portion 24 as shown.
  • magnet 40 has a complementary, arcuately shaped recess on one pole thereof to match an arcuate perimeter on the center portion 32 of the armature means 26.
  • the armature means 26 is held in the ready position, shown in FIG. 1 (against the bias of the spring 36), by a first magnetic field, which includes the first leg portion 20 and the central leg portion 24 of the magnet means 18, and the center portion 32 and the first leg 28 of the annature means 26.
  • the first leg portion 20 has a coil 42 secured near its end.
  • the coil 42 When the hammer l2 is'to be fired, or actuated, the coil 42 is momentarily energized to produce a magnetic field which opposes the first magnetic field to reduce it, thereby permitting the spring 36 to rotate the armature means 26 clockwise (as viewed in FIG. I). When the armature means is so rotating, a striker area 44 on the first leg 28 of the armature means 26 strikes one end of the hammer 12 to fire it.
  • the armature means 26 As the armature means 26 rotates to its operative position, it is effective to switch the permanent magnetic field of the magnet means 18 from the first magnetic field to a second magnetic field.
  • the second magnetic field includes the second leg portion 22 and the central leg portion 24 of the magnet means 18 and the center portion 32 and the second leg 30 of the armature means 26.
  • the second magnetic field assists the spring 36 and also minimizes rebounding" of the first leg 28 when it completes its driving of the hammer l2 and abuts against a return bar 46.
  • the second leg 30 of the armature means 26 comes close to but does not contact the second leg portion 22 of the magnet means l8 when the first leg 28 strikes the return bar 46.
  • the return bar 46 is part of a conventional mechanical means (not shown) for restoring the armature means 26 of the transducer 10 to the ready, or home, position.
  • a conventional mechanical means for restoring the print hammers to a home position is shown in FIGS. 1 through 4 of U.S. Pat. No. 3,049,990, cited in the Background of the Invention."
  • the hammer I2 is conventionally supported on leaf springs 48, which are part of a base portion 50, which is secured to the frame means 16.
  • FIGS. 2a, 2b, 2c, 30, and 3b The motion of the armature means 26 relative to the print hammer 12 is better shown in FIGS. 2a, 2b, 2c, 30, and 3b.
  • FIG. 2a the first leg 28 is shown held against the first leg portion 20 by the first magnetic field, previously mentioned.
  • FIG. 1 shows the spring 36 (FIG. 1) to rotate the armature means 26 so that the striker area 44 contacts the print hammer 12 to drive it towards the drum 14.
  • FIG. 2c the first leg 28 abuts against the return bar 46, stopping its progress towards the drum 14.
  • FIG. 3a shows the first leg 28 resting against the return bar 46 and the print hammer l2 departing from the striker area 44.
  • FIG. 3b shows the first leg 28 being returned to the ready position by the return bar 46.
  • the transducer 10 may be altered as shown by a second transducer 52 (FIG. I).
  • the transducers 10 and 52 are alternated along a row of print column modules to provide nestability of the modules and thereby achieve compactness.
  • the second transducer 52 (FIG. 1) is generally similar in construction to the transducer 10; however, there are some difi'erences.
  • the transducer 52 has a frame means 54, to which the permanent magnet means 18 is secured; however, the magnet means 18 of the transducer 52 is displaced about 90 from the magnet means 18 of the transducer as shown.
  • the armature means 56 of the transducer 52 performs the same function as does the counterpart in the transducer 10; however, the armature means 56 is shaped differently. It has a first leg 58, which abuts against the first leg portion of the magnet means 18 when the transducer 52 is in the ready position, shown.
  • the center portion 60 of the armature means 56 is pivotally joined to the frame means 54 by a pin 34, and a second leg 62 performs the same function as its counterpart 30.
  • the armature means 56 also has a third leg 64, which extends from the center portion 60 and has a striker area 44 on its free end.
  • the third leg 64 is so designed that the striker ares 44 travels along an arcuate path similar to that of the area 44 of the leg 28 of the transducer 10 to strike the associated hammer l2 and be returned to the ready position by the return bar 46.
  • the frame means 16 and 54 have conventional aligning notches 66 to align the print modules containing the transducers l0 and 52 along a row of such modules.
  • a print hammer actuator comprising: a frame means; a print hammer movably mounted on said frame means; an armature means pivotally mounted on said frame means and movable between a ready position and an operative position where it engages said print hammer causing it to print, an including first and second legs and a central portion having an arcuate perimeter; spring means for urging said armature means towards said operative position; magnet means having a first leg portion, a second leg portion, and a central leg portion having a permanent magnet thereon; said magnet having an arcuately shaped recess complementary to said arcuate perimeter on said central portion of said armature means;
  • said central portion and first leg of 'said armature means cooperating with said first leg portion and central leg portion of said magnet means to produce a first magnetic flux path for holding said armature means in said ready position against the bias of said spring means; said central portion and second leg of said armature means cooperating with said second leg portion and central leg portion of said magnet means to produce a second magnetic flux path which assists said spring means in rotating said armature means to said operative position;
  • said armature means includes a third leg which is positioned between said first and second legs and which third leg extends from said central portion of the armature means on a side thereof which is opposite from said permanent magnet;

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  • Impact Printers (AREA)
  • Electromagnets (AREA)
US852653A 1969-08-25 1969-08-25 Electromagnetic drive for print hammers Expired - Lifetime US3630142A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US85265369A 1969-08-25 1969-08-25

Publications (1)

Publication Number Publication Date
US3630142A true US3630142A (en) 1971-12-28

Family

ID=25313895

Family Applications (1)

Application Number Title Priority Date Filing Date
US852653A Expired - Lifetime US3630142A (en) 1969-08-25 1969-08-25 Electromagnetic drive for print hammers

Country Status (9)

Country Link
US (1) US3630142A (de)
JP (1) JPS504491B1 (de)
BE (1) BE755082A (de)
CA (1) CA921766A (de)
CH (1) CH516851A (de)
DE (1) DE2041789C3 (de)
FR (1) FR2056821A5 (de)
GB (1) GB1249769A (de)
ZA (1) ZA705142B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874287A (en) * 1973-06-05 1975-04-01 Honeywell Bull Sa Printing machines
US3968744A (en) * 1975-03-03 1976-07-13 Burroughs Corporation Self-damping unitary print hammer for high speed printers
US4397573A (en) * 1979-11-12 1983-08-09 Thiel Hans Joachim Device for embossing braille code characters
US4493253A (en) * 1983-11-23 1985-01-15 Ncr Canada Ltd. Variable impact printing means
US4703689A (en) * 1985-09-20 1987-11-03 International Business Machines Corporation Two lever print actuator with aligned pivots and energy transfer surfaces

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747521A (en) * 1971-06-25 1973-07-24 Ibm Low cost hammer unit
US3741113A (en) * 1971-06-25 1973-06-26 Ibm High energy print hammer unit with fast settle out
US3982622A (en) * 1974-10-04 1976-09-28 Teletype Corporation Actuator mechanisms for wire matrix printers
JPS54164179U (de) * 1978-05-10 1979-11-17
DE3715304A1 (de) * 1987-05-08 1988-12-01 Protechno Entwicklungsbuero Gm Nadeldruckkopf mit klappankermagneten und ansteuerverfahren dafuer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2483658A (en) * 1945-12-18 1949-10-04 Price Electric Corp Polarized electromagnetic relay
US2740057A (en) * 1952-05-13 1956-03-27 Bosch Gmbh Robert Electromagnetic prime movers
US2759114A (en) * 1951-08-10 1956-08-14 Bosch Gmbh Robert Hair cutting machine having a vibrating armature drive
US3049990A (en) * 1960-12-20 1962-08-21 Ibm Print hammer actuator
GB968562A (en) * 1961-04-28 1964-09-02 Siemens Ag Improvements in or relating to electromagnetic relays
US3153178A (en) * 1959-12-14 1964-10-13 Cons Electrics Ind Corp Magnetic lock-up relay

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2483658A (en) * 1945-12-18 1949-10-04 Price Electric Corp Polarized electromagnetic relay
US2759114A (en) * 1951-08-10 1956-08-14 Bosch Gmbh Robert Hair cutting machine having a vibrating armature drive
US2740057A (en) * 1952-05-13 1956-03-27 Bosch Gmbh Robert Electromagnetic prime movers
US3153178A (en) * 1959-12-14 1964-10-13 Cons Electrics Ind Corp Magnetic lock-up relay
US3049990A (en) * 1960-12-20 1962-08-21 Ibm Print hammer actuator
GB968562A (en) * 1961-04-28 1964-09-02 Siemens Ag Improvements in or relating to electromagnetic relays

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874287A (en) * 1973-06-05 1975-04-01 Honeywell Bull Sa Printing machines
US3968744A (en) * 1975-03-03 1976-07-13 Burroughs Corporation Self-damping unitary print hammer for high speed printers
US4397573A (en) * 1979-11-12 1983-08-09 Thiel Hans Joachim Device for embossing braille code characters
US4493253A (en) * 1983-11-23 1985-01-15 Ncr Canada Ltd. Variable impact printing means
US4703689A (en) * 1985-09-20 1987-11-03 International Business Machines Corporation Two lever print actuator with aligned pivots and energy transfer surfaces

Also Published As

Publication number Publication date
CA921766A (en) 1973-02-27
DE2041789A1 (de) 1971-04-22
JPS504491B1 (de) 1975-02-20
FR2056821A5 (de) 1971-05-14
ZA705142B (en) 1971-04-28
GB1249769A (en) 1971-10-13
DE2041789C3 (de) 1973-01-04
CH516851A (de) 1971-12-15
DE2041789B2 (de) 1972-06-08
BE755082A (fr) 1971-02-01

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