US3883245A - Mechanism for stopping a contact screen at a predetermined position in a process camera - Google Patents

Mechanism for stopping a contact screen at a predetermined position in a process camera Download PDF

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Publication number
US3883245A
US3883245A US402209A US40220973A US3883245A US 3883245 A US3883245 A US 3883245A US 402209 A US402209 A US 402209A US 40220973 A US40220973 A US 40220973A US 3883245 A US3883245 A US 3883245A
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United States
Prior art keywords
sliders
driving means
play
contact screen
driving
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Expired - Lifetime
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US402209A
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English (en)
Inventor
Eiji Miyasaka
Kenichi Yonemaru
Kojiro Henmi
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/66—Details specially adapted for holding half-tone screens

Definitions

  • MECHANISM FOR STOPPING A CONTACT SCREEN AT A PREDETERMINED POSITION IN A PROCESS CAMERA Inventors: Eiji Miyasaka, 489-l.
  • the contact screens used for halftone photography in photomechanical process vary widely in type according to the difference in the screen ruling, screen angle, etc., and a suitable contact screen must be selected for each process work.
  • a contact screen storage section is provided above the photographing section and a suitable screen is selected from said storage section and lowered to the photographing position. This screen is then closely attached to the film and the original image is projected to thereby perform the halftone photography.
  • the present invention is aimed at providing an improved contact screen stopping mechanism which is free of the above-said defects and which is capable of stopping the contact screen retainer correctly and surely at a predetermined position and whereby any impact is prevented from being propagated to the driving source and other parts.
  • FIG. 1 is an external side view showing an embodiment of the present invention, with chains omitted from the drawing;
  • FIG. 2 is a vertical sectional front view taken along the line lI-ll of FIG. 1',
  • FIG. 3 is a side view of the section of FIG. 1 as viewed from the inside;
  • F IG. 4 is a perspective view of another embodiment of the invention for providing a play in the driving mechanism.
  • a pair of vertical guide plates 1 and 2 are retained parallel to each other longitudinally by a suitable number of spacers 3 and secured to a side plate 4 by fixturing means 5, and a vertical streak-like protuberance 6 is formed integrally on the inner one 1 of said guide plates.
  • each said slider 7 is vertically slidable with a part thereof being engaged with said protuberance 6.
  • an upfaced recess 8 In the underside of each said slider 7 is formed an upfaced recess 8, and a horizontal step 9 for sustaining a side of a contact screen retainer bar 10 is formed in the inside middle portion of said slider 7.
  • the up-faced inner and outer supporting pieces 11 and 12 are provided parallel to each other.
  • said recess 8 At an inner end portion of said recess 8 is pivotally secured the inner end of an operating member 13 by a horizontal shaft 14 extending in the longitudinal direction.
  • the outer end of said operating member 13 is secured to a chain 15 which is passed round the sprocket wheels 16 disposed in opposition at the upper and lower positions respectively.
  • a stopper 17 adapted to regulate downward movement of the outer end of said operating member 13.
  • a transversely extending shaft 18 is pivotally secured to a bearing 19 provided fixedly in a pertinent upper part of the side plate 4 in front of the chain 15, and a rocking member 20 and an arm 21 are secured to said shaft 18 on the outer and inner sides of the side plate 4, respectively.
  • a recess 22 In the rear part of said rocking member 20 is formed a recess 22 into which a pin 23 is provided between said up-faced supporting pieces 11 and 12 is received when the sliders 7 rise up to a certain predetermined level.
  • a tension spring 26 which gives a r0- tational force to the rocker member 20 such that its recessed portion 22 will be raised up.
  • a stopper 27 is provided at a pertinent upper end part of the side plate 4 so that said rocker member 20 will be stopped with its recessed portion 22 staying substantially horizontally. Also, when said rocker member 20 turns through a certain angle in the direction of lowering the recessed portion 22, the axial line of the tension spring 26 passes the center of the shaft 18 to impart a downward rotational force to the rocker member 20.
  • the downward turn of the rocker member 20 is regulated by a stopper 28.
  • a limit switch 29 arranged such that when the rocker member 20 turns upwardly, said limit switch is operated to stop movement of the chain 15.
  • Numeral 30 designates a guide for the contact screen retainer bar 10 secured to a pertinent part on the inner face of the side plate 4, said guide 30 being arranged such that its upper surface will be flush with said horizontal step 9 when the sliders 7 stay at their lower position shown in the drawings.
  • Said contact screen retainer bar 10 is arranged movable sidewise on said guide 30 by suitable selection mechanism, not shown, to allow selection of a desired contact screen.
  • the contact screen retainer bar moving mechanism are provided in pair on both right and left sides of said retainer bar 10 and arranged movable up and down while carrying both right and left ends of said retainer bar 10 on a pair of sliders 7.
  • the sprocket wheels 16 are rotated to raise up the sliders 7 through the chain 15 and operating member 13 to move the contact screen retainer bar l upwardly. During this operation, the operating member 13 remains contacted with the upper face of said recess 8.
  • the operating member 13 is rotatable about the horizontal shaft 14 and has play within the range of its rotation. so that the sliders 7 alone are raised up by the rocker member 20.
  • the desired retainer bar on the guide member 30 is selected and placed on the horizontal steps 9 of the sliders 7, and then the chain 15 is driven downwardly to lower the sliders 7 to the photographing position.
  • the contact screen retainer bar 10 need not be adjusted so strictly as required in the conventional devices. Also, there is no possibility that the driving members such as chain and belt be elongated by the impact produced by impingement against the stopper.
  • one of the sliders could fail to return perfectly to the original position due to elongation of the driving means such as chains or aberration between the right and left pitches, but according to the present invention, if the right and left devergence of the driving members is within the scope of the play of said operating member 13, both sliders 7 can be returned perfectly by adjusting the position of the limit switch 29.
  • the operating member 13 with play allows the sliders 7 to rise up free of influence by the driving source such as motor after the chain has been stopped, but it is possible to provide such play in other driving means or other parts of the driving means.
  • HQ 4 shows an example where a play is provided between each sprocket wheel 16 and its rotating shaft 31.
  • An arcuate opening 32 is provided in the boss 33 of the sprocket wheel 16 and a pin 34 is secured to the shaft 31 through said opening 32 to thereby rotate the sprocket wheel 16.
  • a mechanismm for stopping a contact screen in a process camera correctly at a predetermined position comprising sliders arranged movable up and down while carrying a contact screen retainer bar thereon, driving means with play for driving said sliders, a switch to deactuate said driving means and a rocker member and further characterized in that when said sliders are raised up and said rocker member is accordingly pushed up by a part thereof to a point beyond the dead center, said rocker member is turned additionally by a spring, and during this additional turn said rocker member engages a part of said sliders with parts of said sliders to move the latter to their stoppage position.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission Devices (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Projection-Type Copiers In General (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US402209A 1972-10-06 1973-10-01 Mechanism for stopping a contact screen at a predetermined position in a process camera Expired - Lifetime US3883245A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47099793A JPS5127536B2 (enrdf_load_stackoverflow) 1972-10-06 1972-10-06

Publications (1)

Publication Number Publication Date
US3883245A true US3883245A (en) 1975-05-13

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US402209A Expired - Lifetime US3883245A (en) 1972-10-06 1973-10-01 Mechanism for stopping a contact screen at a predetermined position in a process camera

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US (1) US3883245A (enrdf_load_stackoverflow)
JP (1) JPS5127536B2 (enrdf_load_stackoverflow)
DE (1) DE2349788C3 (enrdf_load_stackoverflow)
GB (1) GB1406390A (enrdf_load_stackoverflow)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2376416A (en) * 1942-09-24 1945-05-22 James T Campbell Enlarging and reducing camera
US2939371A (en) * 1957-12-11 1960-06-07 Powers Chemco Inc Photomechanical camera
US3068748A (en) * 1958-04-11 1962-12-18 Powers Chemco Inc Apparatus for handling a contact screen in a photomechanical camera
US3433567A (en) * 1966-06-06 1969-03-18 Photo Mechanix Inc Contact screen application to vacuum film holder
US3506350A (en) * 1966-03-24 1970-04-14 Howson Ltd W H Photographic enlarger for half-tone color printing
US3593228A (en) * 1967-11-18 1971-07-13 Dainippon Screen Mfg Device for selecting and operating contact screens in a photomechanical (process) camera
US3758206A (en) * 1971-03-04 1973-09-11 Y Inoue Device for setting a half-tone negative for producing a half-tone plate for use in polychrome printing to a predetermined position on a sheet film

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2376416A (en) * 1942-09-24 1945-05-22 James T Campbell Enlarging and reducing camera
US2939371A (en) * 1957-12-11 1960-06-07 Powers Chemco Inc Photomechanical camera
US3068748A (en) * 1958-04-11 1962-12-18 Powers Chemco Inc Apparatus for handling a contact screen in a photomechanical camera
US3506350A (en) * 1966-03-24 1970-04-14 Howson Ltd W H Photographic enlarger for half-tone color printing
US3433567A (en) * 1966-06-06 1969-03-18 Photo Mechanix Inc Contact screen application to vacuum film holder
US3593228A (en) * 1967-11-18 1971-07-13 Dainippon Screen Mfg Device for selecting and operating contact screens in a photomechanical (process) camera
US3758206A (en) * 1971-03-04 1973-09-11 Y Inoue Device for setting a half-tone negative for producing a half-tone plate for use in polychrome printing to a predetermined position on a sheet film

Also Published As

Publication number Publication date
GB1406390A (en) 1975-09-17
DE2349788B2 (de) 1980-01-17
JPS5127536B2 (enrdf_load_stackoverflow) 1976-08-13
DE2349788A1 (de) 1974-04-11
JPS4959633A (enrdf_load_stackoverflow) 1974-06-10
DE2349788C3 (de) 1980-09-18

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