US3593657A - Combined print hammer module and printed circuit board - Google Patents

Combined print hammer module and printed circuit board Download PDF

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Publication number
US3593657A
US3593657A US728606A US3593657DA US3593657A US 3593657 A US3593657 A US 3593657A US 728606 A US728606 A US 728606A US 3593657D A US3593657D A US 3593657DA US 3593657 A US3593657 A US 3593657A
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US
United States
Prior art keywords
module
print
modules
hammer
circuit board
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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
US728606A
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English (en)
Inventor
John Guzak Jr
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SCM-P&S Inc
SCM Corp
Original Assignee
SCM Corp
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Publication date
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Application granted granted Critical
Publication of US3593657A publication Critical patent/US3593657A/en
Assigned to SCM-P&S, INC. reassignment SCM-P&S, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SCM CORPORATION, A NY. CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B41J9/10—Hammers; Arrangements thereof of more than one hammer, e.g. one for each character position

Definitions

  • the invention provides a compact construction by which access to adjustable printer components is attained, and by which ease of assembly and manufacture is facilitated.
  • the invention is useful where either single or plural print hammer modules are provided.
  • printers having plural print hammer modules that is, a whole bank of modules, the space between the modules is small.
  • space is conserved, and this space is available for specific purposes, for example, for adjusting the print hammers and for mounting electronic components such as diodes, transistors, and so on.
  • FIG. 1 is a partially broken away perspective view of a portion of a drum printer and shows an assembled group of print hammer modules secured on stationary frame structure in accordance with one embodiment of the present invention
  • FIG. 2 is a side elevational view of a print hammer module and a fragmentary portion of a print symbol carrier shown in FIG. I;
  • FIG. 3 is a sectional view taken along line 34 of FIG. 2;
  • FIG. 4 is a fragmentary perspective view of a hammer operator assembly in conjunction with a printed circuit board.
  • FIG. 1 depicts the arrangement of a print drum and a series of print hammer modules.
  • the modules are individually clamped in module frame structure secured to the printer frame
  • Each module has print hammers adapted for movement into printing cooperation with the print drum and an equal number of hammer operator assemblies. Ready ad justment of the print hammers is provided while the modules are held clamped in the module frame structure and any module is removable from the module frame structure without disturbing the other modules.
  • FIGS. 1 and 2 of the drawings there is shown a fragmentary portion of a data communication printer generally indicated at 10.
  • a moving print symbol carrier 11 is shown in the form of a rotating print drum, although a belt-type or any other suitable type of print symbol carrier could be used.
  • the symbol carrier 11 is shown to have rows of identical print symbol or raised type elements 12.
  • a series of print hammer modules 13 are stacked in vertical side-by-side relationship in frame structure generally indicated at 14.
  • the frame structure 14 is shown to include support plates 16 and 17 at each end of a baseplate l8, and bars or braces 19, 20 and 21 interconnecting the support plates 16 and H7 by means of threaded fasteners 22.
  • the baseplate 18, extending normally with respect to the modules I3, is adjustably secured to the frame 15 of the printer by machine screws 23 (only one of which is shown) which extend through enlarged bores 24 in the printer frame,l5.
  • the baseplate 18 is suitably secured as by threaded fasteners (not shown) to the support plates 16 and 17.
  • Side guides are secured to the frame by threaded fasteners 26'which extend through enlarged bores 27 in the guides 25 and are threadably received in the frame 15.
  • the print hammer modules 13 shown in FIG. 1 are identical for the sake of interchangeability and economy, and hence only one print hammer module 13 is shown in detail in FIG. 2.
  • Each module 13 has a frame 23 which is shown to be of planar from and, in particular, the frame 23 is flat.
  • the frame 28 is preferably blanked out of a single piece of metal, as shown, but it can be composed of or formed from other suitable materials as well.
  • Comb structure 30 is mounted to one side of the frame 2B by threaded fasteners 29.
  • a pivot 36 mounts print hammers 35 about a common axis 36'.
  • a compression spring 38 serves to urge each respective print hammer 35 to a normal position out of printing cooperation with the print symbol carrier 11.
  • All the print hammers 35 are shown to be identical and generally L-shaped in construction and have a long lever arm 39 terminating at its free end at a print or hammer head having a smooth or uninterrupted contour face 40', each print hammer 35 has a bore 35; and the print hammers 35 also have short actuating lever arms 41, 42, 43 and 44 which are shorter than the lever arms 39, which are angularly offset from the lever arms 39, and which extend radially outwardly from the axis 36.
  • the actuating lever arms 41, 42, 43 and 44 form teeth of a circular gear segment.
  • the axis of the gear segment is common with the axis 36'.
  • the lever arms 41, 42, 43 and 44 have involute contoured faces in structural rolling pairing cooperation with respective involute contoured faces at abutment ends 45', 46', 47 and 48' of hammer operator levers 45, 46, 47 and 48.
  • Hammer operator assemblies 49, 50, 51 and and their hammer operator levers 45, 46, 47 and 48 are disposed at equally spaced-apart locations to the frame 28, so that each hammer operator assembly and its respective hammer operator lever has a different angular disposition about the axis 36 to provide an angular array of operator assemblies.
  • the hammer operator levers 45 and 46 are bent inwardly toward the hammer operator levers 47 and 48, and the hammer operator levers 47 and 48 are bent inwardly toward the hammer operator levers 45 and 46.
  • the print hammers 35 are equally spaced apart and ends 45', 46, 47 and 48' terminate in adjacent and aligned relationship with respective lever arms 41, 42, 43 and 44.
  • the actuating lever arms 41, 42, 43 and 44 are shown to be at least equal in number to the number of hammer operator assemblies 49, 50,51 and 52.
  • the hammer operator levers form part of respective hammer operator assemblies generally indicated at 49, 50, 51 and 52.
  • the hammer operator assemblies 49, 50, 51 and 52 are arranged in a planar form so that four or more occupy no more lateral width than would one hammer operator assembly.
  • Each hammer operator assembly 49, 50, 51 and 52 includes an electromagnet 53 having a relatively thin U-shaped core 54, a print coil 55, and relatively flat armature 56 composed of magnetizable plates 57 secured to its respective hammer operator lever.
  • the arrnatures 56 and the respective hammer operator levers 41, 42, 43 and 44 are each pivotal as a unit about respective pivots 58 secured in. the frame 28. Studs 60 secured in the frame 28 threadably receive stop screws 61 which provide an adjustable stop device for the ends of the levers 45, 46, 47 and 48.
  • the springs 38 normally urge the print hammers 35 counterclockwise, as viewed in FIG. 2, and urge respective levers 45, 46, 47 and 48 clockwise away from pole faces 54' of respective electromagnets.
  • the ends of the levers 45, 46, 47 and 48 normally abut their respective stop screws 61, as shown in FIG. 2.
  • FIG. 2 only the first of the four print hammers 35 and springs 38 are seen, the remaining three print hammers 35 and springs 38 being hidden behind them.
  • Inked ribbon R shifts up into the path of the head 40 of the print hammer 35 each time a print hammer 35 is shifted into printing cooperation with the print symbol carrier 11.
  • a record medium R is fed stepwise in line-feed direction between the print symbol carrier 11 and the inked ribbon R by structure (not shown). Neither the inked ribbon R nor the record medium R are shown in FIG. 1 for the sake of clarity.
  • the ribbon R is shifted downwardly to the position shown in FIG. 2.
  • the symbol or symbols printed in a line on the record medium R can be read when looking down from above the modules due to the fact that ribbon R is out of the way and the modules are so constructed that they do not obstruct the view.
  • the modules 13 terminate only a short distance above the hammer heads 40 and the comb structure 29 is disposed entirely below the hammer heads 40.
  • each module is about 0.33 of an inch wide.
  • a printed circuit board 62 associated with its respective module 13 is preferably secured to its module frame 28 by an adhesive 62. Although a printed circuit board 62 with only one layer is shown, a multilayered circuit board can be used, if desired.
  • the printed circuit board 62 is shown to have a plastic insulating base 63. and conductors 64 and 64' printed on the base 63.
  • the conductors 64 and 64' extend around the ends of the operator assemblies 49 through 52 in a generally C-shaped arrangement.
  • Conductors 64' provide circuit connections for the coils 55.
  • the conductors 64 and 64' are connected to respective diodes 55 and coils 55 of hammer operator assemblies 49, 50, 51 and 52, respectively.
  • the diodes 55' suppress the inductive kick of the respective coils 55.
  • Transistors and various other printer logic components can be mounted to the base 63 and connecting conductors 64 and/or 64', if desired.
  • the conductors 64 and 64' are connected to individual conductors 65 which extend through respective enlarged bores 66 in flange portion 68 of the frame 28.
  • the conductors 65 are molded into a plug board 69 and their plug terminals 65 extend into sockets 70 molded in a connector board 70.
  • a plug board 69 is suitably secured to each flange portion 68.
  • the connector board 70 extends the full length of the frame 14 and its sockets 70' are in alignment with plug terminals 65 of all the plug boards 69.
  • Prongs 71 which extend into sockets 70' are connected to printer circuitry (not shown).
  • any module or modules 13 are individually removable from the frame 14 without disturbing the remaining modules 13 in the frame 14.
  • each module 13 is individually clamped in the frame 14 by a clamp element 72 and its associated threaded fastener 73 which, when tightened, urges its respective module frame 28 against a bar 21.
  • the baseplate 18 has parallel equally spaced-apart grooves 74 into which the module frames 28 extend.
  • the grooves 74 provide only enough clearance to provide for insertion and removal of the modules 13.
  • the grooves are accurately located and serve to locate the modules 13 and to hold them in their located positions.
  • Threaded fasteners 22 which hold the brace 19 in position are unthreaded and the brace 19 is removed.
  • As clamping surface 75 of each module 13 is parallel with the bottom of the associated groove 74, and as spring-urged ball 76 offers only slight frictional resistance, the module can be easily pulled out of the frame structure 14. While the module 13 is being pulled out of the frame structure 14, the plug terminals 65 withdraw from sockets 70'. Should it be desired to return the removed module 13 to its former position in the frame structure 14, it is merely slid back into the position it formerly occupied in the frame structure.
  • Each ball 76 exerts only slight pressure on the surface 75 of its respective module 13, and urges the module frame 28 against the baseplate 18.
  • the force of each spring 77 is regulatable by means of a set screw 78.
  • the ball 76 and the spring 77 form a resilient clamping structure 79, and there is one such clamping structure 79 for each module frame 28 although only one is shown in FIG. 2.
  • the symbol carrier rotates at a constant rate. If a particular symbol such as a G is to be printed at a particular location along the line, the head 40 of the proper print hammer 35 is driven into printing cooperation with the print symbol "G" when it is presented in front of that print head 40. Should it happen that the printed line is slightly uneven, it indicates that one or more of the print hammers 35 is driven into printing cooperation with the selected symbol element 12 either too early or too late. With the symbol carrier 11 rotating in the direction indicated by arrow A in FIG.
  • each core 54 of each electromagnet 53 is adjustable with respect to the frame 28 by virtue of machine screws 54 threadably received by the frame 28 which extend through enlarged bores 54'. It is preferred that the adjustment of each electromagnet be such that its respective armature abuts the pole face 54' before the head 40 of the print hammer 35 strikes the ribbon R, thus providing a predetermined amount of separation or loss of contact between the hammer operator lever and its related print hammer and free flight of the print hammer.
  • the ends 45, 46, 47 and 48 and the lever arms 41, 42, 43 and 44 are so dimensioned that such separation therebetween is capable of taking place, as indicated in FIG. 2.
  • the print hammer module 13 can be mounted by a carriage, as shown in said US. application, if desired.
  • a carriage guide rod can extend through an enlarged bore 82 in the module frame 28, also shown in said application.
  • the carriage can be actuated by any suitable means, not shown in said application but disclosed, for example, in US. Pat. No. 3,280,256.
  • An impact printing apparatus including a plurality of electronically driven print hammers which strike a recording surface at an impact zone, wherein the improvement comprises:
  • modules carrying groups of print hammers, print hammer driving mechanisms, and first 'electrical contact means for supplying electrical power to said driving mechanisms;
  • second electrical contact means positioned adjacent the means defining positioning channels and engaging said first electrical contact means on each module when the module is in printing position;
  • each module may be easily and quickly removed from and returned to said printing apparatus.
  • modules also carry a printed circuit board supporting printed circuits which couple the first electrical contact means to the driving mechanisms.
  • fastening means for each module include an elongated, pivotable lever perpendicularly attached to the end of the corresponding means defining a positioning channel and adjustable screw means passing through said lever and into the means defining a positioning channel, whereby a module can be removed by loosening the corresponding screw means and rotating the corresponding lever.

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US728606A 1968-05-13 1968-05-13 Combined print hammer module and printed circuit board Expired - Lifetime US3593657A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US72860668A 1968-05-13 1968-05-13

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US3593657A true US3593657A (en) 1971-07-20

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US (1) US3593657A (de)
DE (1) DE1923839A1 (de)
FR (1) FR2008398A1 (de)
NL (1) NL6906826A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728961A (en) * 1970-07-18 1973-04-24 Gross Cash Registers Ltd Arrangement for electromagnetically setting drum series print wheels
US4388861A (en) * 1980-09-19 1983-06-21 International Business Machines Corporation Bank for accommodating several print hammer units
US4703689A (en) * 1985-09-20 1987-11-03 International Business Machines Corporation Two lever print actuator with aligned pivots and energy transfer surfaces

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2874634A (en) * 1956-02-14 1959-02-24 Olympia Werke Ag Printing apparatus
US2915968A (en) * 1958-10-30 1959-12-08 Clary Corp Printer
US2940385A (en) * 1957-04-01 1960-06-14 Anelex Corp High speed printer
US2955758A (en) * 1960-10-11 jones
US2955755A (en) * 1955-07-29 1960-10-11 Burroughs Corp Electro-mechanical storage, transfer, and read-out device
US3118721A (en) * 1960-03-21 1964-01-21 Paul G Exline Apparatus for accumulating and recording digital information
US3233224A (en) * 1960-09-15 1966-02-01 Burroughs Corp Data processing system
US3289575A (en) * 1964-01-08 1966-12-06 Datamark Inc High speed printer hammer assembly
US3349646A (en) * 1966-05-20 1967-10-31 Siess Otto Razor blade sharpening device
US3418928A (en) * 1966-09-30 1968-12-31 Ponzano Gianluigi Stroke-adjusting and rebound-damping device for high-speed printer hammers
US3429258A (en) * 1968-04-10 1969-02-25 Itt Electrically actuatable counterprinter assembly
US3499382A (en) * 1967-11-24 1970-03-10 Potter Instrument Co Inc Modular assembly for high speed chain printers

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955758A (en) * 1960-10-11 jones
US2955755A (en) * 1955-07-29 1960-10-11 Burroughs Corp Electro-mechanical storage, transfer, and read-out device
US2874634A (en) * 1956-02-14 1959-02-24 Olympia Werke Ag Printing apparatus
US2940385A (en) * 1957-04-01 1960-06-14 Anelex Corp High speed printer
US2915968A (en) * 1958-10-30 1959-12-08 Clary Corp Printer
US3118721A (en) * 1960-03-21 1964-01-21 Paul G Exline Apparatus for accumulating and recording digital information
US3233224A (en) * 1960-09-15 1966-02-01 Burroughs Corp Data processing system
US3289575A (en) * 1964-01-08 1966-12-06 Datamark Inc High speed printer hammer assembly
US3349646A (en) * 1966-05-20 1967-10-31 Siess Otto Razor blade sharpening device
US3418928A (en) * 1966-09-30 1968-12-31 Ponzano Gianluigi Stroke-adjusting and rebound-damping device for high-speed printer hammers
US3499382A (en) * 1967-11-24 1970-03-10 Potter Instrument Co Inc Modular assembly for high speed chain printers
US3429258A (en) * 1968-04-10 1969-02-25 Itt Electrically actuatable counterprinter assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728961A (en) * 1970-07-18 1973-04-24 Gross Cash Registers Ltd Arrangement for electromagnetically setting drum series print wheels
US4388861A (en) * 1980-09-19 1983-06-21 International Business Machines Corporation Bank for accommodating several print hammer units
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
DE1923839A1 (de) 1969-11-20
NL6906826A (de) 1969-11-17
FR2008398A1 (de) 1970-01-23

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SCM-P&S, INC., C/O HANSON INDUSTRIES 100 WOOD AVEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SCM CORPORATION, A NY. CORP.;REEL/FRAME:004681/0977

Effective date: 19870204