US3735698A - Print hammer for a printing machine - Google Patents

Print hammer for a printing machine Download PDF

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Publication number
US3735698A
US3735698A US00063469A US3735698DA US3735698A US 3735698 A US3735698 A US 3735698A US 00063469 A US00063469 A US 00063469A US 3735698D A US3735698D A US 3735698DA US 3735698 A US3735698 A US 3735698A
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US
United States
Prior art keywords
impact beam
print hammer
supporting members
impact
print
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
US00063469A
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English (en)
Inventor
W Lenders
H Post
T Sie
J Visscher
M Quirijnen
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.)
US Philips Corp
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US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3735698A publication Critical patent/US3735698A/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
    • B41J9/127—Mounting of hammers
    • 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

Definitions

  • Fieid C 09 beam, the supporting members and the clamping means are manufactured from the same material, preferably a synthetic resin, and constitute a hammer body which consists of a single part.
  • the print [56] kef'erencesclted hammer is particularly suitable for an electro-dynamic UNITED STATES PATENTS drive and comprises for that purpose an embedded 1 magnet coil and embedded current conductors. 3,172,352 3/1965 Helms ..lO1/93C 3,172,353 3/1965 Helms 101/93 C 7 Claims, 6 Drawing Figures 31 i K l l as 37 l l I -1 PATENTEU NAYZ 91973 SHEET 1 or 2 Fig.1
  • the invention relates to a print hammer for a printing machine comprising an impact beam and two elongate flexible supporting members which are connected at one end to the impact beam and at the other end comprise means for clamping the print hammer on a stationary supporting block, the supporting members, in the rest position of the print hammer, extending substantially in parallel, the impact beam being movable relative to the clamping means in a direction parallel to its center line, the supporting members, during the displacement of the impact beam, being subjected to a bending over at least part of their length.
  • Such print hammers are used in printing machines, inter alia in high speed printing machines which comprise a rotating or translating type support.
  • the print hammers can be driven mechanically, electromagnetically or electrodynamically. It is required that the movement and impact times of the impact beam be as short as possible and remain constant so as to obtain a high impact frequency and a true uniform reproduction of the characters to be printed. Contradictory requirements are imposed upon the impact beam and the supporting members; the impact beam should be resistant to wear and rigid, whereas the supporting members must fulfil a resilient function, while furthermore the mass of the print hammer must be as small as possible.
  • a print hammer which is composed of a large number of elements, usually of small dimensions, and in which in particular the impact beam, the supporting members and the clamping means are manufactured from different materials.
  • the assembly of said elements to form a print hammer is very timeconsuming and expensive and requires a great accuracy of the prefabricated elements.
  • This known print hammer is of such a construction that the connection of the supporting members to the impact beam presents problems; in course of time the supporting members can break at the area of the connection.
  • the impact beam, the supporting members and the clamping means are manufactured mainly from the same material and constitute a hammer body which consists of a single part which has been obtained in a mould. Since the hammer body consists of one single part, connection problems, in particular of the supporting members to the impact beam, are prevented. Since the hammer body has been manufactured in a mould by moulding or' injection moulding, an optimum functional shape can easily be given to the impact beam and to the supporting members; inspite of the fact that thesecomponents are mainly manufactured from the same material, the above contradictory requirements are met at least fo a considerable part.
  • the hammer body is manufactured from a flexibly deformable synthetic resin.
  • the properties inherent in a synthetic resin for example, small mass, flexibility, damping, possibility of moulding, injection moulding, and so on, meet the multiple requirements emposed upon a print hammer in an excellent manner.
  • Synthetic resin is extremely suitable, for injection moulding.
  • the hammer body manufactured from synthetic resin has a small mass so that the inertia and hence the movement and contact times are minimized. Pressure waves to which the print hammer is subject are attenuated by the damping properties of the synthetic resin. Subsequent machining of the moulded or injection moulded hammer body is not necessary.
  • the part of the supporting members which is subject to bending shows a cross-section which increases from a minimum cross-section in the center of said part towards the two ends thereof.
  • a further preferred embodiment of the print hammer according to the invention is characterized by a rectangular cross-section the width of which is constant throughout its length and is at least equal to the thickness of the impact beam.
  • the supporting members at their ends adjoin the impact beam and the clamping means in a smooth manner.
  • the hammer body has the shape of a frame which is closed on all sides, the clamping means forming one assembly with a common connection beam.
  • Such a construction of the hammer body can be mounted easily and accurately on a supporting beam. The possibilities of damage to the hammer body and of undesired deformation of the supporting members during transport and assembly are substantially excluded.
  • the hammer body is manufactured of polyacetal.
  • a print hammer having a hammer body made of polyacetal has a much longer lifetime than, for example, the known print hammer, the impact beam of which is manufactured from aluminum.
  • the impact face of the impact beam is deformed only slightly also after prolonged useso that an accurateand even reproduction 'of the characters to be printed is ensured during a large number of strokes.
  • the distance to be covered by said face and hence the travel time remain substantially constant.
  • the hammer body according to a further embodiment of the print hammer according to the invention comprises at least partly an embedded reinforcement.
  • Glass fibers are preferably used as a reinforcement for the supporting members, and glass fibers metal or another suitable material the rigidity of which is larger than that of the synthetic resin, are preferably used as a reinforcement for the impact beam.
  • the advantage of glass fibers is that they can easily be combined with a synthetic resin in which a good adhesion between the synthetic resin and the glass fibers is obtained.
  • the above-described print hammer is particularly suitable for electrodynamic drive, the impact beam comprising a flat magnet coil supported by a coil support and the axis of which is at right angles to the direction of movement of the impact beam, the print hammer comprising means for supplying current to the magnet coil.
  • this print hammer is characterized in that the magnet coil is embedded in the hammer body, the coil support forming one assembly with the impact beam.
  • the coil with the coil support is secured to the impact beam during assembly. This activity is made superfiuous by moulding or injection moulding of the magnet coil, as a result of which in addition an accurate arrangement of the coil relative to the impact beam is obtained.
  • the impact beam, the supporting members and the clamping means comprise embedded current conductors.
  • FIG. 1 is a longitudinal cross-sectional view of an example of a print hammer according to the invention taken on the line I-I of FIG. 2,
  • FIG. 2 is a side elevation of the print hammer shown in FIG. 1,
  • FIG. 3 is a plan view of the print hammer
  • FIGS. 4, 5 and 6 show further embodiments of the print hammer according to the invention.
  • the print hammer 1 shown in FIGS. 1, 2 and 3 comprises an impact beam 3 which is supported by two elongate supporting members 5 which in the rest position extend parallel to each other and transverse relative to the center line of the impact beam 3.
  • the supporting members 5 each adjoin with one end 7 the impact beam 3 and with the other end 9 a thickened clamping means 11.
  • the impact beam 3, the supporting member 5 and the clamping means 11 are manufactured from the same material, preferably from a flexibly deformable synthetic resin and constitute a hammer body 13 consisting of one single part which has been obtained by moulding or injection moulding in a mould. Polyacetal is preferably used as the synthetic resin.
  • the impact beam 3 can be moved relative to the clamping means 11 in a direction parallel to its center line.
  • the supporting members 5 are flexibly deformed.
  • the cross-section of the supporting members 5 is rectangular and, viewed in a direction parallel to the direction of movement of the impact beam 3, increases from a minimum cross-section in the central part towards the two ends 7 and 9, while the thickness of the supporting members 5, viewed in a direction transverse to the direction of movement of the impact beam, is constant throughout its length and equal to the thickness of the impact beam.
  • the supporting members 5 adjoin the impact beam 3 and the clamping means 11.
  • the print hammer 1 shown is driven electrodynamically and comprises for that purpose a coil support 17 which forms one assembly with the impact beam 3 and I is manufactured from the same material, and a fiat embedded magnet coil 19 the axis of which extends at right angles to the direction of movement of the impact beam 3.
  • the magnet coil 19 may consist of a number of wire or ribbon windings.
  • the current conductors 21 which preferably consist of the ends of the coil windings, and the connection pins 23 for supplying current to the magnet coil, are embedded during the moulding or injection moulding of the hammer body.
  • the apertures 25 in the impact beam 3 and 27 in the coil support 17, are caused by pins in the mould for localizing the current conductors 21 and the magnet coil 19 during the moulding or injection moulding.
  • the magnet coil 19 is arranged asymmetrically relative to the hammer body 13. If desirable the magnet coil can be provided as such in the center of the impact beam 3.
  • FIG. 1 furthermore diagrammatically shows the essential elements of a high speed printing machine known per se.
  • the impact face 29 of the impact beam 3 of the print hammer 1 is arranged opposite to a rotating drum 31 on the circumference of which the characters 33 to be printed are present in relief and in juxtaposed circumferential tracks one of which is shown in FIG. 1.
  • Each track comprises all the characters which it is desirable to print while the number of tracks is equal to the total number of characters which can be printed on one and the same line.
  • an inked ribbon 35 and a paper strip 37 are present.
  • the clamping means 11 are each rigidly clamped to a fixed supporting block 39 while the connection pins 23 are connected to a current supply 41.
  • the hammer body 13 is manufactured from a synthetic resin, insulation problems do not occur.
  • stationary permanent magnets 43 are arranged, the oppositely located poles of which are opposite.
  • a print hammer is arranged on either side of the hammer body 13 at the area of the magnet coil 19 .
  • the drum 31 rotates at a speed in the order of 1,000 r.p.m., each print hammer being energized during each revolution of the drum at the correct instant for printing the desired characters by means of a control circuit.
  • the magnet coil, and hence the impact beam 3 are moved in the direction of the drum 31 by the Lorenz force.
  • the impact face 29 of the impact beam 3 impacts against the paper strip 37, as a result of which said strip together with the inked ribbon 35 is pressed against the drum 31 so that the selected character 33 is printed on the paper strip 37.
  • the impact energy is sufficient to return the print hammer to its original position. During each revolution of the drum 31 a full line can be printed and after each revolution the paper strip 37 is moved stepwise.
  • FIG. 4 shows another embodiment of the print hammer according to the invention, in which the hammer body 13 has the shape of a frame 45 which is closed on all sides and in which the clamping means 11 directly adjoin a common connection beam 47.
  • This construction enables the mounting of the print hammer on a supporting block in a simple manner.
  • the hammer is particularly suitable for mechanical drive, for electrodynamic drive. It can however, be provided with a moulded magnet coil and moulded current conductors.
  • the magnet coil need not necessarily be embedded but may also be provided in a gap on the impact beam 3 which is denoted by 49 in FIG. 4.
  • a reinforcement 51 which may consist of metal, glass fibers of another material the rigidity of which is larger than that of the synthetic resin, can be embedded in the impact beam during the moulding or injection moulding.
  • the supporting members 5 may also comprise an embedded reinforcement 53, preferably of glass fibers, as a result of which the flexible properties can be adapted to different requirements in a desirable manner.
  • the connection beam 47 may be provided with a reinforcement 55 so as to prevent a deformation of the beam during clamping.
  • FIG. 4 shows the transition of the clamping means 1 l on the connection beam 47, but a significant separation between said components need not be visible.
  • FIGS. 5 and 6 show further possible embodiments of the print hammer according to the invention.
  • the hammer body of the print hammer shown in FIG. 5 also has the shape of a closed frame.
  • the supporting members 5 are subjected only over a part of their length to a bending and comprise near their two ends 7 and 9 two bending portions 57 which have a variable cross-section and are connected by a central portion 59 of a constant crosssection.
  • FIG. 6 is a side-elevation of a print hammer in which the supporting members 5 have a cross-section the width b of which is substantially constant throughout the length of the supporting members and is larger than the thickness d of the impact beam 3.
  • the print hammer according to the invention can advantageously be used in any type of printing machine but the advantages hereof are obtained particularly when it is used in a high-speed printing machine.
  • a print hammer for a printing machine comprising an impact beam, said impact beam having an impact face formed at one end thereof adapted to cause pressure impact against a print member, a pair of flexible supporting members attached at one end thereof to and extending from said impact beam substantially parallel to each other when said print hammer is in the stationary position, a thickened portion formed at the other end of said flexible supporting members forming means for clamping said print hammer to a stationary support block at the ends of the supporting members remote from the impact beam, said impact beam, said impact face said supporting members and said clamping means being integrally made of the same flexibly deformable synthetic resin, so as to form a unitary construction.
  • connection beam formed integrally with said clamping means so that said print hammer is formed having a framed construction.

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  • Impact Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
US00063469A 1969-08-29 1970-08-13 Print hammer for a printing machine Expired - Lifetime US3735698A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6913289A NL6913289A (enrdf_load_stackoverflow) 1969-08-29 1969-08-29

Publications (1)

Publication Number Publication Date
US3735698A true US3735698A (en) 1973-05-29

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ID=19807798

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US00063469A Expired - Lifetime US3735698A (en) 1969-08-29 1970-08-13 Print hammer for a printing machine

Country Status (9)

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US (1) US3735698A (enrdf_load_stackoverflow)
AT (1) AT306068B (enrdf_load_stackoverflow)
BE (1) BE755410A (enrdf_load_stackoverflow)
CH (1) CH527471A (enrdf_load_stackoverflow)
DE (1) DE2040075C3 (enrdf_load_stackoverflow)
FR (1) FR2059309A5 (enrdf_load_stackoverflow)
GB (1) GB1325695A (enrdf_load_stackoverflow)
NL (1) NL6913289A (enrdf_load_stackoverflow)
SE (1) SE359946B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968744A (en) * 1975-03-03 1976-07-13 Burroughs Corporation Self-damping unitary print hammer for high speed printers
US3981236A (en) * 1974-03-11 1976-09-21 Sperry Rand Corporation Printhead for impact printer
US4014258A (en) * 1975-08-29 1977-03-29 Wassermann Carl I High speed printing apparatus
US4200043A (en) * 1974-04-05 1980-04-29 Canon Kabushiki Kaisha Printer hammer assembly
US4270448A (en) * 1977-07-06 1981-06-02 Kabushiki Kaisha Suwa Seikosha Printing device
US4288167A (en) * 1980-02-13 1981-09-08 General Electric Company Printhead and blades therefor
US4422377A (en) * 1979-03-26 1983-12-27 Dataproducts Corporation Print hammer and coil assembly
US4833981A (en) * 1984-08-27 1989-05-30 Dataproducts Corporation Field replaceable print hammer
WO2002088930A1 (en) 2001-04-28 2002-11-07 Baxter International Inc. A system and method for managing inventory of blood component collection

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3811377A (en) * 1973-01-02 1974-05-21 Ibm Impact printer
US5335999A (en) * 1992-12-08 1994-08-09 Printronix, Inc. Printer hammerspring

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172353A (en) * 1963-06-17 1965-03-09 Data Products Corp Variable force hammer high speed printer
US3172352A (en) * 1963-05-13 1965-03-09 Data Products Corp Printing hammer assembly
US3279362A (en) * 1965-06-11 1966-10-18 Data Products Corp Printing hammer
US3282203A (en) * 1964-04-16 1966-11-01 Burroughs Corp Magnetically operated print hammers in high speed printers
US3285166A (en) * 1964-12-18 1966-11-15 Data Products Corp High speed print hammer and bar magnet means
US3334409A (en) * 1964-09-01 1967-08-08 Honeywell Inc Method of flexure mounting print hammers
US3354820A (en) * 1966-08-26 1967-11-28 Honeywell Inc Print hammer supporting spring assembly and method of making same
US3359921A (en) * 1964-07-25 1967-12-26 Ibm Print hammer unit for high speed printers
US3447455A (en) * 1967-09-20 1969-06-03 Honeywell Inc Print-hammer mount and fabrication method

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172352A (en) * 1963-05-13 1965-03-09 Data Products Corp Printing hammer assembly
US3172353A (en) * 1963-06-17 1965-03-09 Data Products Corp Variable force hammer high speed printer
US3282203A (en) * 1964-04-16 1966-11-01 Burroughs Corp Magnetically operated print hammers in high speed printers
US3359921A (en) * 1964-07-25 1967-12-26 Ibm Print hammer unit for high speed printers
US3334409A (en) * 1964-09-01 1967-08-08 Honeywell Inc Method of flexure mounting print hammers
US3285166A (en) * 1964-12-18 1966-11-15 Data Products Corp High speed print hammer and bar magnet means
US3279362A (en) * 1965-06-11 1966-10-18 Data Products Corp Printing hammer
US3354820A (en) * 1966-08-26 1967-11-28 Honeywell Inc Print hammer supporting spring assembly and method of making same
US3447455A (en) * 1967-09-20 1969-06-03 Honeywell Inc Print-hammer mount and fabrication method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981236A (en) * 1974-03-11 1976-09-21 Sperry Rand Corporation Printhead for impact printer
US4200043A (en) * 1974-04-05 1980-04-29 Canon Kabushiki Kaisha Printer hammer assembly
US3968744A (en) * 1975-03-03 1976-07-13 Burroughs Corporation Self-damping unitary print hammer for high speed printers
US4014258A (en) * 1975-08-29 1977-03-29 Wassermann Carl I High speed printing apparatus
US4270448A (en) * 1977-07-06 1981-06-02 Kabushiki Kaisha Suwa Seikosha Printing device
US4422377A (en) * 1979-03-26 1983-12-27 Dataproducts Corporation Print hammer and coil assembly
US4288167A (en) * 1980-02-13 1981-09-08 General Electric Company Printhead and blades therefor
US4833981A (en) * 1984-08-27 1989-05-30 Dataproducts Corporation Field replaceable print hammer
WO2002088930A1 (en) 2001-04-28 2002-11-07 Baxter International Inc. A system and method for managing inventory of blood component collection

Also Published As

Publication number Publication date
DE2040075A1 (de) 1971-03-11
CH527471A (de) 1972-08-31
GB1325695A (en) 1973-08-08
NL6913289A (enrdf_load_stackoverflow) 1971-03-02
FR2059309A5 (enrdf_load_stackoverflow) 1971-05-28
DE2040075B2 (de) 1978-05-24
BE755410A (fr) 1971-03-01
AT306068B (de) 1973-03-26
SE359946B (enrdf_load_stackoverflow) 1973-09-10
DE2040075C3 (de) 1979-01-18

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