USRE31516E - Filmstrip metering device for a camera - Google Patents

Filmstrip metering device for a camera Download PDF

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Publication number
USRE31516E
USRE31516E US06/177,614 US17761480A USRE31516E US RE31516 E USRE31516 E US RE31516E US 17761480 A US17761480 A US 17761480A US RE31516 E USRE31516 E US RE31516E
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US
United States
Prior art keywords
gear
wind
lever
filmstrip
camera
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
US06/177,614
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English (en)
Inventor
Harumi Tanaka
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.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
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 Minolta Co Ltd filed Critical Minolta Co Ltd
Application granted granted Critical
Publication of USRE31516E publication Critical patent/USRE31516E/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G03B1/02—Moving film strip by pull on end thereof
    • G03B1/14—Special arrangements to ensure constant length of movement of film
    • G03B1/16—Special arrangements to ensure constant length of movement of film by film-arresting pins
    • 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
    • G03B1/02—Moving film strip by pull on end thereof
    • G03B1/04—Pull exerted by take-up spool
    • G03B1/08—Pull exerted by take-up spool rotated by band, chain, rack, or other linear reciprocating operation

Definitions

  • This invention relates generally to a filmstrip metering device adapted to lock a filmstrip after one frame thereof has been wound due to the operation of a wind-up member, and more particularly to such a device for metering a filmstrip having each frame thereof provided with a single metering perforation with a sensing member being engageable with a filmstrip metering perforation, the wind-up member being provided on a side of a camera body.
  • the winding of one frame of a filmstrip and the cocking of the shutter are both effected by operating the filmstrip wind-up member.
  • the filmstrip has to be locked so as to interrupt its winding around a shaft.
  • Filmstrip metering devices for use in a camera of this type are classified into three categories:
  • a clutch mechanism is disposed between a filmstrip wind-up member and a transmission member adapted to transmit the movement of the filmstrip wind-up member to a filmstrip winding shaft, while a meshing engagement between the filmstrip wind-up member and the transmission member is released by means of the clutch mechanism, when a given length of a filmstrip is wound.
  • the approach according to category (1) requires that a cocking operation of the shutter be completed simultaneously with the completion of winding one frame of the filmstrip by the operation of the filmstrip wind-up member, with the result that the length of a filmstrip to be fed until the completion of cocking of the shutter is progressively increased, depending on the length of the filmstrip wound about a filmstrip winding shaft, thus providing varying spacings between each two frames of a filmstrip.
  • the category (3) approach uses a clutch mechanism, such that when gears of a transmission member mesh with gears of a film wind-up member by means of the clutch mechanism, a high winding load is directly applied to transmission gears, with the resulting incomplete meshing between gears. As a result, a filmstrip is wound, with edges of teeth of one gear being urged against edges of teeth of another gear.
  • a filmstrip metering device for use in a camera and most nearly falls into the aforedescribed category (3).
  • Each frame of the filmstrip has a single filmstrip metering perforation, and a sensing member is movably provided on the camera body and is engageable with a filmstrip metering perforation.
  • a filmstrip winding shaft is driven by the operation of a wind-up member through the medium of transmission means having a clutch mechanism which causes meshing of a rack gear of the wind-up member with the transmission means.
  • the sensing member senses a filmstrip metering perforation in the filmstrip which is being moved by the rotation of the filmstrip winding shaft, and engages a filmstrip metering perforation, with the result that the sensing member is moved relative to the camera body.
  • the clutch mechanism is disengaged in association with the operation of the sensing member to lock the film; and a resetting member, adapted to be operated by the wind-up member in the initial phase of the winding operation of the filmstrip, releases the sensing member from engagement with the filmstrip metering perforation so as to reset the sensing member in its initial position, so that the clutch mechanism is brought into an engageable condition again.
  • the filmstrip is driven through the medium of the clutch mechanism adapted to be brought into an engaging condition due to the operation of the filmstrip wind-up member.
  • the filmstrip is locked as the sensing member engages a filmstrip metering perforation, whereby an engaging condition of the clutch mechanism is released, thereby preventing the filmstrip from being continuously driven due to a subsequent winding operation.
  • cocking of the shutter may be effected due to a subsequent winding operation in a manner that the sensing member will not exert an excessive load on the filmstrip.
  • the spacings of each frame of the filmstrip being fed may be maintained constant.
  • the clutch mechanism may be brought into an engaging condition again in association with the operation of a resetting member to release the sensing member from engagement with a filmstrip metering perforation due to the subsequent winding operation after taking a picture the re-engagement of the clutch mechanism is effected due to the meshing of the first gear included in the transmission means with the wind-up member.
  • the first gear positively engages the filmstrip wind-up member and a second gear under the action of a weak spring as well as due to the rotation of itself, thereby rotating the second gear in a manner that the second gear will move along the periphery of an intermediate gear meshing with the second gear.
  • a first lever which has been pivotally supported by a shaft of the first gear and a shaft of the second gear rotates about the center of rotation of the first gear
  • a second lever pivotally supported by the shaft of the second gear and a shaft of the intermediate gear rotates about the center of rotation of the intermediate gear, with the result that the first lever engages a stopper, while the second lever engages a locking member cooperative with the sensing member.
  • the respective centers of rotation of the first and second gears are rigidly fixed, whereupon the filmstrip wind-up member completely meshes with the first gear. Accordingly, a winding load is applied to the first gear, so that the filmstrip begins to be wound about a winding shaft through the medium of the first and second gears and the intermediate gear. More particularly, in the initial phase of the meshing operation of the wind-up member with the first gear, no winding load is applied to the first gear, so that the first gear may smoothly but positively mesh with the wind-up member, thus avoiding the danger of the filmstrip being wound under an incomplete meshing condition of the both members.
  • FIG. 1 illustrates a condition wherein a sensing member has been reset immediately before the commencement of a filmstrip winding operation
  • FIG. 2 shows a condition wherein a filmstrip is in the course of winding
  • FIG. 3 indicates a condition wherein the aforesaid winding operation has been completed
  • FIG. 4 indicates a condition where a shutter has been completed.
  • a wind-up member 1 is reciprocally mounted on the camera body (not illustrated for the sake of clarity) by a pin-in-slot arrangement. Member 1 is urged to the right, when viewing FIGS. 1 to 4, under the action of a spring 2 interconnecting a portion thereof with the camera body.
  • Rack teeth 1c are provided along an inner edge of member 1 and are adapted to mesh with the teeth of a first gear 13 forming an element of the transmission means to be described hereinafter.
  • a shoulder portion 1a is provided on an opposite edge of member 1 and is adapted to engage a shutter cocking lever 3, disposed on the camera, in the course of the leftward movement of wind-up member 1.
  • the wind-up member is formed with cutaway portions 1d. 1e which are adapted to rotate a return-movement-preventive lever 7 due to its engagement therewith, lever 7 being mounted on the camera body for pivotal movement about its shaft 7a, being connected to the camera body by means of a spring 30 for resiliently maintaining it in a neutral non-rotative position.
  • member 1 is formed with ratchet teeth 1b positioned between cutaway portions 1d and 1e which teeth are engageable with return-movement-preventing lever 7.
  • the wind-up member 1 may be prevented from returning to its initial position of FIG. 1 during its advance movement in the direction of arrow A, or may be prevented from advance during its return movement, respectively.
  • the advance movement thereof may be switched to the return movement or the return movement may be switched to the advance movement, only when return-movement-preventive lever 7 extends into cutway portions 1d or 1e at the end of the advance or return travel of the wind-up member.
  • a resetting lever 8 has a pin 8a mounted on an arm thereof which pin is engageable with return-movement-preventive lever 7, lever 8 being mounted on the camera body for pivotal movement about a shaft 8c.
  • Resetting lever 8 is resiliently biased during its rotational movement by means of a spring 9 interconnecting it with the camera body.
  • First gear 13 is mounted for rotation about a shaft 13a and is adapted to mesh with rack gear teeth 1c on the wind-up member so as to be driven by member 1.
  • the rotation of first gear 13 is transmitted through the medium of a second gear 17, an intermediate gear 18 and wind-up gear-engaging gear 19 to a filmstrip wind-up gear 20 rotatably mounted on a filmstrip cartridge 31 shown in phantom outline and being inserted into the camera body.
  • Gears 13, 17, 18, 19 constitute transmission members having intermeshing gear teeth thereon for transmitting rotation of gear 13 to that of gear 20 in a typical manner.
  • a first lever 15 is pivotally mounted on shaft 13a of the first gear as well as on a shaft 15a on which second gear 17 is mounted for rotation.
  • First lever 15 is also pivotable relative to a second lever 16 mounted for pivotal movement about shaft 15a. Accordingly, as first lever 15 pivotally moves about shaft 15a, first gear 13 rotates along the periphery of second gear 17.
  • Second lever 16 is mounted for pivotal movement on the camera body by means of a shaft 16a, on which gears 18 and 19 are mounted for rotation. Second lever 16 is urged for rotating in a counterclockwise direction by means of a spring 27 positioned between the opposite end of the second lever and a return-movement-preventive pawl 28 pivotally mounted to the camera body by its shaft 28a. Thus, first lever 15 is urged for rotation in a counterclockwise direction in such a manner whereby first gear 13 may engage rack teeth 1c of wind-up member 1.
  • An operating lever 4 is rotatably supported on the camera body by means of a shaft 4c, and is urged for counterclockwise rotation by a spring 5 bearing against a pin on the camera body and against an arm 4d of the lever.
  • Lever 4 also has a bent portion 4a engageable with the end of an arm 6a of a locking lever 6 to be described hereinafter, an inclined portion 4b engageable with a release sensor 3a connected to shutter cocking lever 3, bent portion or arm 4d being engageable with an end of arm 22b of a double-exposure-preventive lever 22 pivotally mounted on shaft 8c.
  • Locking lever 6 has a jaw portion 6b which is engageable with an end of arm 16b of second lever 16 to hold same.
  • Lever 6 is mounted on the camera body for pivotal movement about a shaft 6d, and is urged for counterclockwise rotation by a spring 21 which bears against a pin 6c on lever 6 and against a pin on the camera body.
  • Pin 6a and shaft 6d extend into guide slots 10b and 10c, respectively, which are provided in a sensing lever 10, so that lever 10 may slide relative to lever 6, and is rotatable together therewith.
  • Sensing lever 10 is urged downwardly by a spring 24 bearing against a portion thereof and against a pin on the camera body, as shown, so that a lowermost sensing portion 10a thereof continuously abuts against a filmstrip 11 contained within film cartridge 31.
  • a bent arm portion 10d, provided on sensing lever 10 at an opposite end thereof, is adapted to engage an arm 8b of resetting lever 8.
  • a spring 9 interconnects a portion of lever 8 with the camera body so as to maintain the lever in a neutral position of rotation.
  • sensing lever 10 is moved upwardly against the action of spring 24.
  • bent portion 10d is maintained out of engagement with arm 8b of lever 8, when sensing portion 10a engages a filmstrip metering perforation 11a provided for each frame of filmstrip 11.
  • lever 22 is pivotally mounted on shaft 8c of resetting lever 8, and is urged by means of a spring (not shown) for counterclockwise rotation.
  • Lever 22 has an arm 22b which is engageable with arm 4d of lever 4, and another arm 22a on an end opposite arm 22b, arm 22a being engageable with an end face of an axially movable release button shaft 23 provided on the camera.
  • a lever 25 is pivotally mounted on shaft 8c and is urged for clockwise rotation by means of a spring 26 bearing against a pin on lever 25 and on the camera body, so as to abut lever 25 against cartridge 31. Therefore, when the cartridge is not loaded in the camera, lever 25 is rotated clockwise and bears against lever 22 by means of a bent portion provided on lever 25. Thus, lever 22 is rotated clockwise together therewith. As a result, arm 22a is retracted from a moving locus of release button shaft 23.
  • sensing portion 10a of sensing lever 10 is merely abutting against filmstrip 11 without extending into a metering perforation 11a thereof, bent portion 10d is positioned out of a rotating locus of arm 8b of resetting lever 8.
  • sensing lever 10 is slightly rotated counterclockwise under the action of spring 21, so that sensing portion 10a abuts against a portion of filmstrip 11 which is spaced a small distance to the right of perforation 11a, into which the sensing portion 10a had extended.
  • locking lever 6, together with sensing lever 10 is rotated counterclockwise, so that jaw portion 6b is brought into a position engageable with arm 16b of lever 16.
  • bent portion 4a of lever 4 when rotated counterclockwise, abuts against top end 6a of lever 6.
  • First gear 13 is brought into a positive meshing engagement with rack 1c of wind-up member 1 due to the leftward movement of member 1 under the action of a weak spring 14.
  • First gear 13 is thereupon rotated counterclockwise during the leftward movement of wind-up member 1 and is firmly enmeshed with the teeth of rack 1c and of second gear 17 due to the force of spring 14 and its own rotation. Meanwhile, counterclockwise rotation of first gear 13 causes second gear 17 to rotate clockwise along the periphery of intermediate gear 18 while moving downwardly as in FIG. 3.
  • first lever 15 pivots counterclockwise about shaft 15a
  • second lever 16 pivots clockwise about shaft 16a.
  • shaft 13a of first gear 13 is not rigidly mounted in place, it is freed from a winding load, thereby permitting a smooth meshing engagement with rack 1c.
  • shaft 13a of first gear 13 and shaft 15a of second gear 17 are firmly positioned, so that first gear 13 may mesh with rack 1c completely, and a winding load may be thereby exerted on first gear 13.
  • the leftward movement of wind-up member 1 is transmitted by way of first gear 13, second gear 17, intermediate gear 18 and wind-gear-engaging gear 19 to filmstrip-wind gear 20 of cartridge 31, thereby starting the winding of the filmstrip.
  • a filmstrip metering perforation 11a approaches sensing portion 10a for the reception thereof as shown in FIG. 2.
  • sensing lever 10, together with locking lever 6, is rotated clockwise about shaft 6d, so that jaw portion 6b of locking lever 6 is disengaged from arm 16b of second lever 16.
  • jaw portion 6b of locking lever 6 is disengaged from arm 16b, the moment sensing lever 10 locks filmstrip 11.
  • top end portion 6a of locking lever 6 engages bent portion 4a of lever 4, so that lever 4 is rotated clockwise and is held in such position.
  • second lever 16 is rotated clockwise to a large extent, thereby releasing first gear 13 from its meshing engagement with rack 1c. Accordingly, filmstrip 11 is no longer driven by a subsequent winding operation, while the shutter may be cocked.
  • an arm of return-movement preventive lever 7 extends into cutaway portion 1e, so that lever 7 is rotated clockwise so as to release wind-up member 1 from its locked condition thereby permitting member 1 to be returned to its rest position to the right under the action of spring 2.
  • second lever 16 is returned by spring 27 to its position where arm 16b engages jaw portion 6b of locking lever 6.
  • release button shaft 23 When release button shaft 23 is depressed, then the shutter, cocking lever 3 and release sensor 3a travel from the lefthand cocked position to the righthand release positions, so that as shown in FIG. 4, release sensor 3a engages inclined surface 4b of lever 4, thereby rotating lever 4 clockwise.
  • bent portion 4a releases top end 6a of locking lever 6 from its engaged condition, while bent portion 4d moves away from arm 22b of double-exposure-preventive lever 22, thereby allowing lever 22 to rotate counterclockwise under the action of a spring (not shown).
  • Arm 22a of double-exposure-preventive lever 22 precludes the subsequent depression of release button shaft 23, thereby allowing a subsequent winding operation.
  • detecting lever 25 rotates clockwise under the action of spring 26, thereby causing double-exposure-preventive lever 22 to rotate in the same direction against the action of its spring.
  • arm 22a of double-exposure-preventive lever 22 is retraced from a locus of release button shaft 23, thereby allowing an advancing motion for the release button shaft 23.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Cameras Including Film Mechanisms (AREA)
US06/177,614 1975-08-21 1980-08-13 Filmstrip metering device for a camera Expired - Lifetime USRE31516E (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP50/114328 1975-08-21
JP1975114328U JPS5713543Y2 (ja) 1975-08-21 1975-08-21

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
US71623276A Continuation 1975-08-21 1976-08-20
US05/839,814 Reissue US4107715A (en) 1975-08-21 1977-10-06 Filmstrip metering device for a camera

Publications (1)

Publication Number Publication Date
USRE31516E true USRE31516E (en) 1984-02-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US06/177,614 Expired - Lifetime USRE31516E (en) 1975-08-21 1980-08-13 Filmstrip metering device for a camera

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US (1) USRE31516E (ja)
JP (1) JPS5713543Y2 (ja)
DE (1) DE2636867A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5357302A (en) * 1991-01-04 1994-10-18 Minolta Camera Kabushiki Kaisha Apparatus for feeding photographic film having two perforations per frame

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5446711U (ja) * 1977-09-08 1979-03-31

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810219A (en) 1971-12-09 1974-05-07 Agfa Gevaert Ag Film transporting mechanism for still cameras
US3820142A (en) 1973-03-12 1974-06-25 Eastman Kodak Co Camera
US3829875A (en) 1972-11-24 1974-08-13 Agfa Gevaert Ag Photographic camera for use with roll film
US4009478A (en) 1974-09-06 1977-02-22 Minolta Camera Kabushiki Kaisha Film advance and metering mechanism for cameras
US4115792A (en) 1976-08-13 1978-09-19 Agfa-Gevaert Ag Film transport mechanism for cameras

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810219A (en) 1971-12-09 1974-05-07 Agfa Gevaert Ag Film transporting mechanism for still cameras
US3829875A (en) 1972-11-24 1974-08-13 Agfa Gevaert Ag Photographic camera for use with roll film
US3820142A (en) 1973-03-12 1974-06-25 Eastman Kodak Co Camera
US4009478A (en) 1974-09-06 1977-02-22 Minolta Camera Kabushiki Kaisha Film advance and metering mechanism for cameras
US4115792A (en) 1976-08-13 1978-09-19 Agfa-Gevaert Ag Film transport mechanism for cameras

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5357302A (en) * 1991-01-04 1994-10-18 Minolta Camera Kabushiki Kaisha Apparatus for feeding photographic film having two perforations per frame
US5410380A (en) * 1991-01-04 1995-04-25 Minolta Camera Kabushiki Kaisha Apparatus for feeding photographic film having two perforations per frame

Also Published As

Publication number Publication date
JPS5229135U (ja) 1977-03-01
JPS5713543Y2 (ja) 1982-03-18
DE2636867A1 (de) 1977-03-03

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