US3775000A - Claw device - Google Patents

Claw device Download PDF

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Publication number
US3775000A
US3775000A US00217322A US3775000DA US3775000A US 3775000 A US3775000 A US 3775000A US 00217322 A US00217322 A US 00217322A US 3775000D A US3775000D A US 3775000DA US 3775000 A US3775000 A US 3775000A
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US
United States
Prior art keywords
tooth
perforation
distance
rearward
transporting direction
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
US00217322A
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English (en)
Inventor
E Krob
A Valoh
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3775000A publication Critical patent/US3775000A/en
Anticipated expiration legal-status Critical
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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
    • G03B1/00—Film strip handling
    • G03B1/18—Moving film strip by means which act on the film between the ends thereof
    • G03B1/20—Acting means
    • G03B1/22—Claws or pins engaging holes in the film

Definitions

  • A' drive device is adapted to impart a first movement to the shuttle mechanism cyclically in and out of engagement with the perforation holes of the strips.
  • the drive device is further adapted to impart a second movement to the shuttle mechanism cyclically and in synchronism with the first movement upand down parallelly with' the path of movement of one of the strips to move the same in transporting direction.
  • First and second teeth on the shuttle mechanism are numbered, as when seen in the transporting direction.
  • the teeth have forward and rearward surfaces opposite to each other, the surfaces of each of the teeth having a distance from each ward surface of the second tooth and the rearward surface of the first tooth increased by a further tolerance corresponds to the smallest existing distance on the strip types between the forward edge of the first perforation hole and the rearward edge of the second perforation hole; the distance of the rearward surface of the second tooth to the forward surface of the first tooth reduced by another tolerance corresponding to the largest existing distance on the strip types between the rearward edge of the first perforation hole and the forward edge of the second perforation hole.
  • multiple tooth claws have the advantage that-the film isfransported eventhen, when oneofthe perforation holes is torn. Beyond-that, the mechanical strain of thefilm may be assigned to-several :p'erforation holes, providedthat'the distance between the *two teeth corresponds exactly to the perforation pitchB-Since," however,valready in the distances of v the perforation holes-theremay, occur some tolerances, it
  • The'scope of the invention was to develop adouble tooth clawassmall as possible for striplike perforated in formation carriers of different perforation pitch and different format. According to the invention this is solved in that the distance of thefront surface of the second tooth tothe rear surface of the first tooth, a certain tolerance included, correspondsto the distance of the front edge of the related first perforation hole to the rear edge of the in running direction following perforathe distance ofthe rear edge of the first perforation hole to the front edge of the "in'running direction following perforation hole of strips of the other format, as
  • the control arrangement shows two coaxial control curves I for optionally scanning of .a cam follower, whereby each control curve is assigned to the lift movement' of the claw for one format; From the Austrian PatentSpec'ification No, 282 350a claw control by means of cams has already become known, but this invention relates to the possibility to secure a reverse run of the strip-like perforated information carrier without chang- I ing over the control arrangement. Moreover it is necessary to equalize in, the window the frame position of one format with the frame position of the other format.
  • the super 8 film is the format most in. use in the trade, the control curve assigned to this format will be scannedmore frequently; However with outer curves there is'the danger that the control curve is not always scanned faithfully upon abrupt changing from'the large radius of curvature to the small one. Hence it follows a particularly advantageous embodiment of the invention, if the control curve for super 8 format films is designed as inner curve.
  • This cam disk 2 is connected with a shutter 3, which rotates upon forward run of the film in the direction of the arrow.
  • a claw frame 4 is arranged in front of the cam disk 2, which is shiftable in vertical direction and tiltably rests in the ball guides 5.
  • the frame 4 engageswith its both teeth 6,7 the perforation of the film 8 and transports the same upon forward run in'the direction of the arrow.
  • the optical axis of the illuminating and reproducing arrangement is marked by 9.
  • cam follower 10 fixed to the frame 4, engages a groove, which is formed by the two curves 12,13.
  • a spring 14 presses the cam follower 10 against the cam disk 2.
  • the frame 4 further bears two pins 15 and 16, which cooperate with a thigh spring 17 mounted on a bolt 18.
  • a vertical slider 19 bears stops 20 and 21, by means of which the thigh spring 17 may be joined to one of the pins 15 or 16.
  • the cam follower 10 is pressed either to the curve 12 or 13.
  • the groove 11 is designed with a recess 22, which upon scanning the cam follower 10 causes a tilting of the frame 4 round the ball guide 5, whereby the claw teeth6,7 engage the perforation holes of the strip-like perforation carrier.
  • the cam follower transmits the movement predetermined by a control curve 12 or 13 to the claw teeth 6 or 7 respectively, whereby the control curve 12 is assigned to the lift movement 'of the claw for films of super 8 format, the control curve 13 for films of normal 8 format. If now for instance a normal 8 film should be transported instead of the set super 8 film, the slider 19 is pressed downwards.
  • the spring arm 17a of the thigh spring 17 is then removed from the pin 16 by the stop 21, likewise is the spring arm 17b removed from the stop 20 by the pin 15.
  • the spring 17 is now put under stress between thestop 21 and the pin 15, whereby the cam follower 10 ispressed against the control curve 13.
  • the front surface 23 of the tooth 6 engages with both formats in the third perforation hole after the ration hole to the rear edge 31 of the following perforation hole of the normal 8 format is larger by a tolerance b in the range of approximately 0.1 0.3.
  • the distance d of the surfaces 24,25 facing each other of the two teeth 6,7 is as large as the distance g from the rear edge 29 of the first perforation hole to the front edge 30 of the following perforation hole of super 8 format plus a tolerance e f in the range of approximately 0.5.
  • the distance h from the front surface 23 to the rear surface 24 of the tooth 6 is larger than the distance i from the surface 25 to the surface 26 of the tooth 7.
  • the distance h of the front surface 23 to the surfae 24 of the tooth 6 is smaller by a tolerance in the range of approximately 0.3 0.4 than the distance k of the front edge 27 to the rear edge 29 of the smallest perforation hole.
  • cam follower On the deepest point of the control curve, contrary to the illustration in FIG. 1. Therewith it is achieved that the mass of the cam follower does not counteract to the spring force as a result of the occurring inertial forces upon scanning the control curves.
  • each of said strip types having equidistant perfofation holes, the perforations of different strip types having different perforation pitches, each of said perforationholes having a forward and a rearward edge seen in said transporting direction, whereby with aligned forward edges of a first perforation hole of each of said different strip types second respective perforation holes which follow when seen in transporting direction only partly overlap each other, the apparatus comprisa shuttle mechanism located between said supply station and said take up station;
  • drive means adapted to impart a first movement to said shuttle mechanism cyclically in and out of en- I gagement with said perforation holes of said strips, said drive means being further adapted to impart a second movement to said shuttle mechanism cyclically and in synchronism with said first movement up and down parallelly with the path of movement of one of said strips to move the same in transporting direction;
  • first and second teeth on said shuttle mechanism numbered as when seen in said transporting direction, said teeth having forward and rearward surfaces opposite to each other, said surfaces of each of said teeth having a distance from each other;
  • At least said second tooth being adapted to engage said forward edges of the perforation holes of said strips when transported in said transporting direction, the distance between the forward and rearward surface of said second tooth corresponding to the space between said forward and rearward edges of the smallest perforation holes of one of said strip types to be used less a tolerance;
  • the distance between said forward surface and said rearward surface of said second tooth is larger than the corresponding distance of said first tooth.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection-Type Copiers In General (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Facsimile Scanning Arrangements (AREA)
US00217322A 1971-01-22 1972-01-12 Claw device Expired - Lifetime US3775000A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT55571A AT306515B (de) 1971-01-22 1971-01-22 Greifer

Publications (1)

Publication Number Publication Date
US3775000A true US3775000A (en) 1973-11-27

Family

ID=3493705

Family Applications (1)

Application Number Title Priority Date Filing Date
US00217322A Expired - Lifetime US3775000A (en) 1971-01-22 1972-01-12 Claw device

Country Status (4)

Country Link
US (1) US3775000A (it)
AT (1) AT306515B (it)
DE (1) DE2158969C3 (it)
IT (1) IT949334B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3907413A (en) * 1972-02-01 1975-09-23 Vockenhuber Karl Strip-feeding mechanism for motion-picture projectors and the like

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0276766A (ja) * 1988-08-31 1990-03-16 Internatl Business Mach Corp <Ibm> 用紙給送トラクタ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3428395A (en) * 1966-02-23 1969-02-18 George A Mitchell Film and pilot system
US3514196A (en) * 1969-05-05 1970-05-26 Eastman Kodak Co Motion picture projector
US3640441A (en) * 1968-10-23 1972-02-08 Vockenhuber Karl Intermittent drive mechanism for cinematographic apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3428395A (en) * 1966-02-23 1969-02-18 George A Mitchell Film and pilot system
US3640441A (en) * 1968-10-23 1972-02-08 Vockenhuber Karl Intermittent drive mechanism for cinematographic apparatus
US3514196A (en) * 1969-05-05 1970-05-26 Eastman Kodak Co Motion picture projector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3907413A (en) * 1972-02-01 1975-09-23 Vockenhuber Karl Strip-feeding mechanism for motion-picture projectors and the like

Also Published As

Publication number Publication date
DE2158969B2 (de) 1980-04-17
DE2158969A1 (de) 1972-08-10
DE2158969C3 (de) 1980-12-11
IT949334B (it) 1973-06-11
AT306515B (de) 1973-04-10

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