US3279364A - Hammer construction - Google Patents

Hammer construction Download PDF

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Publication number
US3279364A
US3279364A US476294A US47629465A US3279364A US 3279364 A US3279364 A US 3279364A US 476294 A US476294 A US 476294A US 47629465 A US47629465 A US 47629465A US 3279364 A US3279364 A US 3279364A
Authority
US
United States
Prior art keywords
coil
hammer
current
magnetic field
coil structure
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
US476294A
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English (en)
Inventor
Clifford J Helms
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.)
Ricoh Printing Systems America Inc
Original Assignee
Dataproducts 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 NL131643D priority Critical patent/NL131643C/xx
Application filed by Dataproducts Corp filed Critical Dataproducts Corp
Priority to US476294A priority patent/US3279364A/en
Priority to GB26305/66A priority patent/GB1087104A/en
Priority to NL6608863A priority patent/NL6608863A/xx
Priority to FR70394A priority patent/FR1497547A/fr
Priority to DED50745A priority patent/DE1289676B/de
Application granted granted Critical
Publication of US3279364A publication Critical patent/US3279364A/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
    • B41J9/02—Hammers; Arrangements thereof
    • B41J9/133—Construction of hammer body or tip
    • 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
    • B41J9/38—Electromagnetic means

Definitions

  • This invention relates generally to high speed printing apparatus and more particularly to improved impact devices for use therein.
  • the present invention is directed to a hammer construction having characteristics which make it less expensive and more reliable than previously known hammer constructions.
  • a hammer constructed in accordance with the present invention can be more ofiiciently operated than previously known hammers.
  • acoil structure comprised of a flat rigid single turn coil structure or a plurality of such coil structures laminated together, is utilized in lieu of multiturn coiled conductors supported within a rigid housing.
  • a single turn or laminated coil structure can be provided at a lower cost than previously known coil structures inasmuch as the single turn coil structure can be inexpensively formed from aluminum or copper material. It should be appreciated that such a coil structure is also inherently more reliable than prior art coil structures.
  • a transformer core is inductively coupled to the coil structure which itself functions as a transformer secondary winding.
  • a multiturn primary winding is also coupled to the transformer core.
  • FIGURE 1 is a side sectional view of one embodiment of a printing hammer constructed in accordance with the present invention
  • FIGURE 2 is a vertical sectional view taken substantially along the plane 22 of FIGURE 1 and illustrating a front view of the hammer of FIGURE 1;
  • FIGURE 3 is a perspective view of a laminated coil structure which can be alternatively employed in .the embodiment of FIGURE 1;
  • FIGURE 4 is a perspective view of a further embodiment of the invention.
  • FIGURE 5 is a rear view of a portion of a hammer bank comprised of hammers as shown in FIGURE 4.
  • a bank of printing hammers 12 is provided spaced from the drum 10.
  • the hammer bank 12 usually includes a number of hammers equal to the number of tracks formed on the drum 10.
  • a printing ribbon 14 Positioned between the hammer bank 12 and the drum 10 is a printing ribbon 14 and the paper 16 to be printed upon.
  • the paper 16 is incrementally driven (by means not shown) to each new line position. After the paper settles into a new line position, a signal is usually provided to control means (not shown) which functions to actuate each hammer just prior to the character it is to print moves into printing position.
  • a printing hammer 18 including a rigid flat unitary single turn coil structure 20 formed of conductive material such as aluminum or copper.
  • a gap 22 is formed in the coil structure thereby defining coil terminals on either side thereof.
  • the gap 22 can be filled with an insulative material (not shown).
  • the coil structure 20 can be formed from any one of several known techniques such as stamping, precision, casting, etc.
  • An impact tip 28, which can also be formed of aluminum or copper, is carried on the upper end of the coil structure 20 and preferably in electrical contact therewith.
  • the coil structure 20 is supported on a pair of electrically conductive support members and 32 which preferably comprise flat spring members having enlarged first ends 34 and 36 which are secured to opposite sides of the coil structure 20 and enlarged second ends 38 and 40 which are structurally and electrically secured to conductive portions 41 and 42 of a supporting block 43.
  • the conductive portions 41 and 42 are insulated from one another by epoxy 44 or such.
  • the supporting members 30 and 32 extend in planes which intersect each other at point 45. Portions of the coil structure 20 preferably extend below the point 45 in order to lower the center of rotation of the coil structure as described in the aforecited patent application.
  • a support assembly 46 is provided which carries a plurality of individually adjustable backstops 48 adapted to engage the rear end 50 of the impact tip 28 when the printing hammer is in its rest position.
  • the front end 52 of the impact tip 28 is of course adapted to force the paper 16 against the ribbon 14 and drum 10.
  • the first ends 34 and 36 of the conductive support members 30 and 32 are electrically secured to the coil member 20 on opposite sides of the gap 22 by some conductive material such as solder.
  • the second ends 38 and 40 of the support members 30 and 32 are respectively electrically and structurally secured to conductive portions 41 and 42 of the supporting block 43.
  • the rear edges of the portions 41 and 42 are preferably rounded so that they can be received in V-grooves formed in surface 74 of a positioning block 78. Set screws 7? can be used to secure the supporting block 43 to the positioning block 78.
  • the utilization of precision-formed V-grooves in surface '74 permits easy registration of all of the hammers 18. When in position, all of the impact tips 28 should be in substantial alignment with the center line of the drum 10.
  • the conductive portions 41, 42 of the supporting block 43 are electrically connected across a secondary winding (not shown) on a transformer core 80.
  • the conductive portions 41 and 42 are preferably formed of a heavy gauge copper or other highly conductive material in order to minimize power loss therein.
  • the ends of the supporting members 30 and 32 are enlarged of course to reduce resistance and power loss in the current path.
  • the transformer core will probably require a large cross-section which may in turn require that the transformer cores be arranged in two tiers spaced either vertically or horizontally from one another.
  • the hammer bank 12 can consist of two sections, the first section comprises of hammers 18 which are supported above a lower positioning block 78 and a second section comprised of hammers 18' depending from an upper positioning block (not shown).
  • lower and upper permanent magnet sections 96, 36 are provided each defining a plurality of gaps, each gap adapted to receive one of the hammers 18, 18 therein.
  • the permanent magnets can be arranged substantially as illustrated in US. patent application Serial No. 419,509, filed December 18, 1964, and assigned to the same assignee as the present application.
  • the permanent magnet banks are illustrated as being two deep in that patent application inasmuch as the coil projecting from each shank extends above and below the shank so that each hammer utilizes magnets both above and below its shank, in accordance with the present invention the permanent magnet bank need only be one deep since half of the hammers will utilize the lower magnet bank 96 and half of the hammers will utilize the upper bank 96.
  • the magnet banks can be cantilevered from the support assembly 46 as illustrated.
  • FIGURES 1 and 2 an improved hammer construction has been disclosed herein in which both the structural and electrical properties of a rigid unitary single turn coil preferably formed of aluminum or copper has been employed. That is, the structural properties of the coil structure have been employed to carry the impact tip 28 while the electrical properties thereof have been employed to conduct current between the ends thereof for interaction with the permanent magnetic field in order to develop a propelling force.
  • a flat rigid unitary coil member as shown in FIGURE 1 which can be formed by fabrication methods such as stamping, casting, etc., can be provided at a lower cost than a multiturn coil conductor carried within a housing.
  • a coil structure as disclosed herein has greater inherent reliability than a coiled conductor supported within a housing. That is, there is considerably less likelihood that the current path in the unitary coil structure'illustrated herein will be ruptured than in prior art coil structures.
  • the propelling force applied to the hammer is proportional to the magnitude of the permanent magnetic field, the magnitude of the current through the coil, and the number of coil turns within the magnetic field, it should be clear that if the number of turns is reduced by a factor of 100 for example, the current must be increased by that same factor if the same force is to be developed, assuming that the magnitude of the magnetic field remains constant.
  • the cross-section of the unitary single turn coil structure can be many times that of a single turn of the coiled conductive ribbon previously disposed within a housing, a current can be developed by the transformer and driven through the coil structure whose magnitude is many times greater than the magnitude of current previously driven through the coiled conductor.
  • FIGURE 3 a pluraliy of unitary coil members can be laminated together to form a rigid structure as shown in FIGURE 3 wherein three unitary coil members 110, 112, and 114 are held together by an insulating epoxy material (not shown) provided therebetween.
  • the conductive support members 30, 32 will be respectively connected to the first end of coil member 110 and the second end of coil member 114.
  • Jumpers 116 and 118 will respectively connect the second ends of coil member 110 to the first end of coil member 112 and the second end of coil member 112 to the first end of coil member 114.
  • FIG- URES 1 and 2 provides enough cross-sectional area to carry sufiicient current for all contemplated applications of the hammer 18, as the magnitude of the current is increased, the power loss, and thus the efiiciency, decreases as a consequence of the power loss in the conductive spring members 30 and 32. More particularly, inasmuch as power loss is proportional to the square of the current, the tremendous increase in current required as a consequence of reducing the number of turns by a hundred fold, causes a tremendous increase in power -loss through the spring members.
  • FIG- URES 4 and 5 current is directly induced, via transformer action, into the rigid flat unitary coil member 120.
  • the coil member 120 is similar to that illustrated in FIGURES 1 and 2 except however it defines a closed conductive loop instead of including the gap 22 (FIG- URE 1).
  • the unitary coil member 120 can also be formed by any one of a plurality of known fabrication techniques.
  • a transformer core 122 is threaded through the central opening 124 of the unitary coil member 120.
  • a multiturn primary winding 126 is wound on the transformer core 122.
  • the impact tip 138 carried by the unitary coil member 120 should be positioned at the center of percussion with respect to the center of rotation 136.
  • the hammer will have its lowest effective mass and therefore travel and contact times will be minimized.
  • the reactive forces on the support members 128 and 130 will be minimized. Because of this, and also because the support members 128 and 130 are no longer called upon to conduct current, they can comprise very simple and inexpensive spring members.
  • the positions of the transformer cores 122 can be staggered as shown in FIGURE 5 in order to enable terial which is'well suited for a transformer core for the indicated application is Supermendur.
  • transformer action can be utilized to induce a current in a laminated coil structure of the type shown in FIGURE 3 and also in prior art coil structures comprised of multiturn coiled con ductors disposed within coil housings either through supporting members as shown in FIGURES l and 2 or directly as shown in FIGURES 4 and 5.
  • FIGURES l and 2 supporting members as shown in FIGURES l and 2 or directly as shown in FIGURES 4 and 5.
  • FIGURES 4 and 5 directly as shown in FIGURES 4 and 5.
  • FIG. 4 and 5 the provision of a unitary coil member or laminated coil structure has been shown only in conjunction with rotatable mounting means, it should be apparent that such coil structures can be utilized in hammers in which the structure is propelled linearly as for example as described in the aforecited U.S. Patent No. 3,172,352.
  • currents can be induced in coil structures mounted for linear movement by transformer action.
  • a hammer construction comprising:
  • said means supporting said structure including first and second conductive springs respectively connected to said first and second terminals;
  • a hammer construction comprising:
  • a rigid coil structure comprised of one or more fiat single turn unitary conductive coil members connected in series;
  • a hammer construction comprising:
  • a rigid structure including a current conducting means
  • said means for driving current including a transformer core; and means inductively coupling said transformer core to said current conducting means.
  • a printing hammer comprising:
  • a rigid coil structure comprised of at least one fiat unitary conductive member energizable to generate a first magnetic field
  • a printing hammer comprising: a rigid coil structure including a current conducting means energizable to generate a first magnetic field; means supporting said rigid structure for substantially rotational movement about a first axis; means establishing a second magnetic field adapted to interact with said first magnetic field; and
  • means for energizing said current conducting means including a transformer core and means inductively coupling said transformer core to said current conducting means.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Impact Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
US476294A 1965-08-02 1965-08-02 Hammer construction Expired - Lifetime US3279364A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL131643D NL131643C (en, 2012) 1965-08-02
US476294A US3279364A (en) 1965-08-02 1965-08-02 Hammer construction
GB26305/66A GB1087104A (en) 1965-08-02 1966-06-13 Improvements relating to printing apparatus
NL6608863A NL6608863A (en, 2012) 1965-08-02 1966-06-24
FR70394A FR1497547A (fr) 1965-08-02 1966-07-22 Marteau de frappe pour appareils imprimeurs de caractères
DED50745A DE1289676B (de) 1965-08-02 1966-08-02 Druckhammeranordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US476294A US3279364A (en) 1965-08-02 1965-08-02 Hammer construction

Publications (1)

Publication Number Publication Date
US3279364A true US3279364A (en) 1966-10-18

Family

ID=23891274

Family Applications (1)

Application Number Title Priority Date Filing Date
US476294A Expired - Lifetime US3279364A (en) 1965-08-02 1965-08-02 Hammer construction

Country Status (4)

Country Link
US (1) US3279364A (en, 2012)
DE (1) DE1289676B (en, 2012)
GB (1) GB1087104A (en, 2012)
NL (2) NL6608863A (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493568A (en) * 1983-02-22 1985-01-15 Estabrooks David A Dot matrix printhead employing moving coils

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3072045A (en) * 1958-06-02 1963-01-08 Bull Machines Sa Triggering electronic devices for the control of electromagnetic actuating devices
US3172353A (en) * 1963-06-17 1965-03-09 Data Products Corp Variable force hammer high speed printer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1213652B (de) * 1962-02-22 1966-03-31 Olympia Werke Ag Elektromechanische Antriebsvorrichtung fuer einen Typentraeger od. dgl.
US3172352A (en) * 1963-05-13 1965-03-09 Data Products Corp Printing hammer assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3072045A (en) * 1958-06-02 1963-01-08 Bull Machines Sa Triggering electronic devices for the control of electromagnetic actuating devices
US3172353A (en) * 1963-06-17 1965-03-09 Data Products Corp Variable force hammer high speed printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493568A (en) * 1983-02-22 1985-01-15 Estabrooks David A Dot matrix printhead employing moving coils

Also Published As

Publication number Publication date
GB1087104A (en) 1967-10-11
DE1289676B (de) 1969-02-20
NL6608863A (en, 2012) 1967-02-03
NL131643C (en, 2012)

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