US3759174A - Print hammer striking moving type at an angle to compensate for frictional force - Google Patents

Print hammer striking moving type at an angle to compensate for frictional force Download PDF

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Publication number
US3759174A
US3759174A US00145692A US3759174DA US3759174A US 3759174 A US3759174 A US 3759174A US 00145692 A US00145692 A US 00145692A US 3759174D A US3759174D A US 3759174DA US 3759174 A US3759174 A US 3759174A
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US
United States
Prior art keywords
impact beam
type support
frictional force
printing device
impact
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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
US00145692A
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English (en)
Inventor
M Quirijnen
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US Philips Corp
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US Philips Corp
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Filing date
Publication date
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Publication of US3759174A publication Critical patent/US3759174A/en
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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

Definitions

  • ABSTRACT A printing device comprising a type support and one or more hammers cooperating therewith. Each hammer has an impact beam which is arranged so that it strikes the face of the type support at an angle in such manner that the reaction force exerted on the impact beam during a stroke of the impact beam against said face has a component, in addition to a component in thedirection of the impact beam equal to the frictional force exerted on the impact beam.
  • the invention relates to a printing device comprising a type support and one or more hammers cooperating therewith and each comprising an impact beam.
  • Printing devices of the above-described type are known and the hammers in these devices are driven mechanically, electromagnetically or electrodynamically. It is generally required that the time of movement and contact of the impact beam be as short as possible and remain constant so as to obtain a high stroke frequency and a truly uniform reproduction of the characters to be printed. In order to satisfy the said requirement, the impact beam must be resistant to detrition and be rigid and furthermore the mass of the impact hammer must be as small as possible.
  • the hammers are often arranged on supporting members which may be in the form of leaf springs.
  • a drawback of these known printing devices is that the impact beam of each of the hammers is arranged so that the face of the type support is hit at an angle of 90.
  • the impact beam strikes against the type support, first of all the reaction force of the stroke with which the impact beam strikes against the type support acts on the impact beam, while furthermore a frictional force is exerted on the impact beam due to the continuously moving type support and the paper which is taken along in a slipping manner during the stroke.
  • this frictional force rather large stresses occur in the supporting members of the impact beams which considerably reduce the life of said members.
  • the printing device is characterized in that the impact beam of each of the hammers is arranged so that it strikes against the face of the type support at an angle such that the reaction force exerted on the impact beamduring the stroke of the impact beam against said face has a component, in addition'to a component in the direction of the impact beam, which is directed opposite to and is substantially equal to the frictional force exerted on the impact beam.
  • the impact beam of each of the hammers is arranged so that the face of the type support is struck at such an angle that the reaction force has a component which compensates for the frictional force, the supporting members of said impact beams are now no longer exposed to large stresses so that the life of the printing device is considerably improved. Furthermore, the quality of the printed characters is considerably improved.
  • the impact beam of each of the hammers viewed in the direction of rotation of the type roller, is arranged in front of the plane passing through the axis of the type roller and parallel to the impact beam.
  • the impact beam of each of the hammers encloses an acute angle with the part of the chain and band, respectively, which, viewed in the direction of movement of the chain and band, respectively, is located after the relevant impact beam.
  • FIG. 1 shows diagrammatically and not to scale a known printing device having a type roller
  • FIG. 2 shows diagrammatically a printing device having a type roller in which the impact beam strikes the face of the type roller at an acute angle
  • FIG. 3 shows diagrammatically and not to scale a printing device having a type roller in which the impact beam of the hammer, viewed in the direction of rotation of the type roller, is arranged in front of the plane passing through the axis of the type roller and parallel to the impact beam,
  • FIG. 4 shows diagrammatically a printing device in which the types are supported by a chain and in which the impact beam encloses an acute angle with the part of the chain which, viewed in the direction of movement, is located after the relevant impact beam.
  • reference numeral 1 de notes a type roller which rotates in the direction denoted by an arrow.
  • an impact beam 2 is arranged which is secured to a supporting block 5 by supporting members 3 and 4, in the form of leaf springs.
  • the printing paper 6 is present between the-type roller 1 and the impact beam 2.
  • the type roller 1 moves continuously.
  • the impact beam 2 is arranged at the level of the axis 7 of the type roller 1.
  • FIG. Z shows a printing device which generally corresponds to the device shown in FIG. 1 and the components of which are denoted by the same reference numerals.
  • the impact beam 2 is arranged so that its direction corresponds to th direction of the resultant of the forces S and W of FIG. I.
  • the reaction force S which of course is again directed at right angles to the surface of the type roller, now has, in addition to a component S, in the direction of the impact beam, a component S, which is directed opposite to and is equally large as the frictional force W.
  • the adverse influences of the frictional force W on the life and the printing quality have thus been fully eliminated.
  • FIG. 3 shows diagrammatically a printing device which generally corresponds to the device shown in the preceding Figures and the components of which are therefore referred to by the same reference numerals.
  • the impact beam 2 is displaced against the direction of rotation of the roller 1 so that the impact beam 2 is now arranged in front of the plane passing through the axis 7 of the roller 1 and parallel to the impact beam.
  • the reaction force S which acts upon the impact beam is now resolved into a reaction force S, in the direction of the impact beam and reaction force S, in a direction at right angles thereto and directed upwards. So this reaction force S acts in a direction opposite to the frictional force W so that said forces can compensate for each other in the case of suitable choice of the arrangement of the impact beam.
  • the supporting members 3 and 4 are no longer loaded in their longitudinal directions by the said forces so that no large stresses can occur in the said supporting members any longer and their lifetime is considerably improved. All this is achieved without the introduction of extra structural components.
  • Direction of rotation of the type roller in the construction of the printing device shown in FIG. 2 is to the right, the impact beam 2 in this case is present above the axis of the type roller. If on the contrary it deals with a type roller the direction of rotation of which is to the left, the impact beam 2 should be arranged below the axis of. the type roller 1.
  • FIG. 4 shows a printing device in which the types are supported by a chain 8 which is moved in the direction of the arrow in a manner not shown.
  • the impact beam 9 is arranged so as to enclose an acute angle a with the plane of the chain.
  • the invention provides a printing device in which the frictional force is compensated for in a surprisingly simple manner and without the introduction of extra structural components, as a result of which a longer life and a better printing quality is obtained than in the known printing devices.
  • leaf springs have been used by way of example as supporting members for the impact beams, it will be obvious that in the case of other guides for said impact beams the advantages of the arrangement of the impact beam according to the invention occur to the same extent.
  • a printing device comprising a continuously moving type support and at least one print hammer arranged for cooperation therewith, said print hammer comprising a base member, a rigid impact beam arranged for movement toward and away from said type support, one end of said impact beam forming an impact surface for engagement with said type support, thereby producing a frictional force on said impact beam at the moment of engagement and a reaction force, and support members carried by said base for supporting said impact beam so that upon movement thereof into engagement with said type support said impact beam will strike said type support at an angle so that said reaction force has a first component in the direction of said impact beam, and a second component being substantially equal and opposite to said frictional force.
  • said type support is a rotating type roller having printing characters on the surface thereof, and wherein said impact beam is supported by said support members in front of the plane passing through the axis of said type roller and parallel to said impact beam.

Landscapes

  • Impact Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
US00145692A 1970-06-04 1971-05-21 Print hammer striking moving type at an angle to compensate for frictional force Expired - Lifetime US3759174A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7008102A NL7008102A (de) 1970-06-04 1970-06-04

Publications (1)

Publication Number Publication Date
US3759174A true US3759174A (en) 1973-09-18

Family

ID=19810239

Family Applications (1)

Application Number Title Priority Date Filing Date
US00145692A Expired - Lifetime US3759174A (en) 1970-06-04 1971-05-21 Print hammer striking moving type at an angle to compensate for frictional force

Country Status (10)

Country Link
US (1) US3759174A (de)
JP (1) JPS5223282B1 (de)
AT (1) AT312962B (de)
BE (1) BE768077A (de)
CA (1) CA943398A (de)
CH (1) CH524463A (de)
DE (1) DE2124380A1 (de)
FR (1) FR2095815A5 (de)
GB (1) GB1289456A (de)
NL (1) NL7008102A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848722A (en) * 1973-05-21 1974-11-19 Ibm Print disc assembly for a printer
US3981236A (en) * 1974-03-11 1976-09-21 Sperry Rand Corporation Printhead for impact printer
EP0226398A2 (de) * 1985-12-05 1987-06-24 Xerox Corporation Anschlagdrucker mit schräg arbeitender Druckkraft

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1102177A (en) * 1977-05-23 1981-06-02 Thomas T. Hardt Print band one edge guide
JPH0433678A (ja) * 1990-05-30 1992-02-05 Ace Denken:Kk 遊技機島
JPH04122378A (ja) * 1990-09-14 1992-04-22 Ace Denken:Kk 遊技島の開閉幕板発光装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3128694A (en) * 1961-10-16 1964-04-14 Holley Carburetor Co Print hammer mechanism
US3228325A (en) * 1964-03-16 1966-01-11 Wendell S Miller Magnetic actuated hammers in a line printer
US3292531A (en) * 1964-11-28 1966-12-20 Kienzle Apparate Gmbh Printing hammer arrangement
US3309989A (en) * 1965-09-16 1967-03-21 Gen Electric Print hammer
US3353482A (en) * 1966-04-11 1967-11-21 Rca Corp Flexible type mounts in high speed printing machines
US3623427A (en) * 1968-06-01 1971-11-30 Ibm Rotating type carrier with shiftable hammer carrier

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3128694A (en) * 1961-10-16 1964-04-14 Holley Carburetor Co Print hammer mechanism
US3228325A (en) * 1964-03-16 1966-01-11 Wendell S Miller Magnetic actuated hammers in a line printer
US3292531A (en) * 1964-11-28 1966-12-20 Kienzle Apparate Gmbh Printing hammer arrangement
US3309989A (en) * 1965-09-16 1967-03-21 Gen Electric Print hammer
US3353482A (en) * 1966-04-11 1967-11-21 Rca Corp Flexible type mounts in high speed printing machines
US3623427A (en) * 1968-06-01 1971-11-30 Ibm Rotating type carrier with shiftable hammer carrier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848722A (en) * 1973-05-21 1974-11-19 Ibm Print disc assembly for a printer
US3981236A (en) * 1974-03-11 1976-09-21 Sperry Rand Corporation Printhead for impact printer
EP0226398A2 (de) * 1985-12-05 1987-06-24 Xerox Corporation Anschlagdrucker mit schräg arbeitender Druckkraft
EP0226398A3 (de) * 1985-12-05 1988-12-14 Xerox Corporation Anschlagdrucker mit schräg arbeitender Druckkraft

Also Published As

Publication number Publication date
JPS5223282B1 (de) 1977-06-23
CH524463A (de) 1972-06-30
NL7008102A (de) 1971-12-07
FR2095815A5 (de) 1972-02-11
BE768077A (fr) 1971-12-03
CA943398A (en) 1974-03-12
AT312962B (de) 1974-01-25
DE2124380A1 (de) 1971-12-23
GB1289456A (de) 1972-09-20

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