US3703945A - Cushioning device for mechanical details in photographic cameras and similar precision apparatus - Google Patents

Cushioning device for mechanical details in photographic cameras and similar precision apparatus Download PDF

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Publication number
US3703945A
US3703945A US95070A US3703945DA US3703945A US 3703945 A US3703945 A US 3703945A US 95070 A US95070 A US 95070A US 3703945D A US3703945D A US 3703945DA US 3703945 A US3703945 A US 3703945A
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US
United States
Prior art keywords
double lever
braking
movable part
arm
journal
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
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US95070A
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English (en)
Inventor
Lennart Gunnar Oskar Dahlgren
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Individual
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Individual
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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
    • G03B19/00—Cameras
    • G03B19/02—Still-picture cameras
    • G03B19/12—Reflex cameras with single objective and a movable reflector or a partly-transmitting mirror
    • 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
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/08—Shutters
    • G03B9/28—Roller blind or flexible plate
    • G03B9/32—Double blind
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1502—Escapement

Definitions

  • Cl ..F16d 63/00 set the first jumaling Ptmt, extends twatd the [58] Field of Search ..74/1.5; 188/68, 85, 166 first iumsling and has a Zigzag famed therein and a pin on the other arm of the double lever 56]
  • References Cited engages the zigzag groove and causes the brake link to oscillate with an amplitude which increases as the pin UNITED STATES PATENTS approaches the first journaling point when the double lever is rotated by the movable part.
  • This invention relates to photographic cameras and similar precision apparatus with mechanisms comprising intermittently moving details in the form of, for example, shutters of roller blind type, hinged viewfinder mirrors and the like.
  • the invention relates to a cushioning device, which in the final phase of the movement of the mechanism detail in question softly and rapidly brakes the movement and thereby prevents rebound of the detail when it arrives at an accurately defined fixed end position.
  • Photographic cameras and similar precision apparatus comprise intermittently and rapidly operating light-weight mechanism details such as shutters of roller blind type, flap shutters, hinged viewfinder mirrors and the like. These mechanisms have in common that their total reaction time is desired to be short so as to effect rapid operation of the apparatus, for example a camera, of which the mechanism is a part.
  • the short total reaction time requires rapid acceleration at the release and rapid braking in the final phase.
  • the rapid acceleration is obtained by means of a strong spring mechanism, an electro-magnet or another drive means, which is no part of the present invention.
  • the requirement of rapid braking usually is combined with the requirement of a running as noiseless and non-vibratile as possible, an accurately defined end position of the mechanism detail and freedom from rebound.
  • the definite end position of the mechanism detail is motivated by the fact that two or more mechanisms, for example viewfinder mirror and roller blind shutter mechanisms, may coact relative to one another in such a manner, that one mechanism in its end position releases the subsequent mechanism by disengaging a catch, closing a contact or the like.
  • a less distinct end position due to varying friction and/or caused by an adjustable speed governor can result in an interruption of the function of the apparatus in question.
  • a rebound of one or several moving mechanism parts striking in the end position against a stationary stop may, for example, have the effect that a blind slit, which already has moved past the gate of the camera in the desired way, is recoiled so as momentarily to move again over the edge of the gate and thereby give rise to an incorrect exposure.
  • a plurality of means adapted to brake mechanism parts of the type here in question are already known. They involve, however, the disadvantage of being complicated and bulky, or they do not meet the aforementioned function requirements to the extent desired.
  • the cushioning device according to-the invention renders possible a rapid and soft braking of the mechanism part at a definite end position, irrespective of possible variations in the speed, as the function of the device is self-regulating to some extent.
  • the kinetic energy remaining when the moving parts are stopped in the end position against a stationary stop member, is small, and the construction effectively prevents a recoil movement with a resulting rebound of the mechanism part.
  • the vibrations are reduced to an acceptable nondetrimental level and the mechanism operates relatively noiseless.
  • a cushioning device according to the invention further includes the advantages of simple design, small space requirements and easy assembly with the mechanism to be braked.
  • FIG. 1 shows in a schematic way a view from above of the cushioning device according to the invention, assembled with a roller blind shutter, the cushioning device not yet being in operation,
  • FIG. 2 shows the moment of commencing cushioning, FIG. 2a being a detail of FIG. 2 showing another variant of the cushioning device,
  • FIG. 3 shows the device according to FIG. 1 with ongoing braking of the mechanism
  • FIG. 4 and 4a show in a corresponding way the cushioning device in its end position, FIG. 4a showing the variant corresponding to FIG. 2a.
  • the mechanism for a roller blind shutter indicated in FIGS. 14 comprises a roller blind 1 with its edge 2, which together with a second roller blind (notshown) forms a slit, which upon exposure moves from the left to the right in the Figures where it moves past a gate 3 with one lateral edge 4 thereof.
  • the roller blind I is wound on a roller blind shaft 5, carrying a stationary cogwheel 6, which coactingly engages with a toothed wheel 7 on a driving spring housing 8 supported on a shaft 9.
  • the cogwheel 6 and toothed wheel 7 are indicated in the Figures only in a schematic way.
  • the cushioning device comprises a carrier pin 10 on the spring housing 8 which actuates a double lever 11 (alternatively 11a in FIGS. 2a and 4a) mounted on a journal 12.
  • the double lever arm 13 (alternatively 13a) facing the spring housing 8 is actuated when, it comes into contact with the carrier pin 10, the other arm 14 actuating the braking and cushioning details.
  • Said details comprise a return spring 15 which tries to turn the double lever 11 (alternatively 11a) in counterclockwise direction and is fastened in a pin 16 on the arm 14 and in a stationary pin 17, and a brake link 18, which'is designed as a single plane lever supported on a journal 19 and includes a longitudinally extending zig-'- zag groove 20 with a guide pin 21 on the lever 14 running therein.
  • the variant 11a of the lever 11 shown in FIGS. 20 and 4a, in its arm 13a facing the spring housing 8, is provided with a fork-shaped recess 22 having legs 23, 24 for the carrier pin 10.
  • the amplitude ofthe oscillation increases gradually with the approach of the guide pin 21 to the end position of the groove 20 located nearest to, the journal 19.
  • the successively increasing work involved for oscillating the brake link 18 brings about a softly increasing braking effect.
  • To said braking effect contributes also, to a certain smaller degree, the successive tensioning of the return spring 15, which has as its main object to turn the double lever 11, alternatively 11a, to the starting position.
  • the driving force from the spring housing 8 considerably exceeds that from the return spring15.
  • the guide pin 21 moves easily in the groove 20 as'there is a small play, so that the mechanism always will reach its definite end position shown in FIGS.
  • the double lever 11 is prevented from being subject to rebound by the remaining kinetic'energy, because thebrake link 18 isin an outer position, and the guide pin 21 upon rebound presses against the innermost oblique surface in the groove 20 so as, to cause the brake link 18 to change its direction of motion, and thereby exerts a locking effect on the double lever 11 so that the rebound is subdued to a non-detrimental value.
  • the spring housing 8 and the mechanism driven thereby are prevented to rebound, because the carrier pin 10 is retained by the lefthand leg 23 in the recess 22 on the arm 13a.
  • the carrier pin 10 moves in clockwise direction and the return spring 15 turns the double lever 11, alternatively 11a, counterclockwise to the starting position shown in FIG. 1.
  • the details comprised in the cushioning device can be adjusted to the mechanism with which they coact and to the apparatus they are to be built in.
  • the shape and length of groove 20, for example, the relation between the arms 13, 13a and, respectively, 14 of the double lever 11, alternatively 11a, the weight and size of the brake link 18, etc. may be varied substantially without abandoning the idea of the invention.
  • the invention can also be applied within fields other than the photographic one, where equivalent mechanisms are applied which are to be braked and cushioned.
  • a cushioning device for soft, reboundless braking of an intermittently operating, movable part of a mechanical mechanism of a photographic camera or like precision apparatus comprising; double lever means mounted on a first journal means nd havin a first and a second arm respectively exten lng from e point of joumaling of said double lever; said first arm of said double lever being actuatable by said movable part; return spring means attached to said second arm of said double lever and tensioned-by said double lever being tumed'on said first journal by said movable part; brake link means mounted on a second journal means offset from said first journal, having a single arm extending from said second journal toward said first journal and having a zigzag groove formed therein; and pin means mounted on said second arm of said double lever and operatively engaged in said zigzaggroove; said brake link being oscillatable with an amplitude which increases as said pin approaches said first journal when said double lever is turned on said first journal by said movable part.
  • a cushioning device for soft, reboundless braking of an intermittently operating, movable part of a mechanical mechanism of a photographic camera or like precision apparatus comprising, a pivotally mounted braking element, an intermediate element means responsive to movement of said movable. part over a final portion of its movement for actuating said intermediate element, a follower element on one of said intermediate and braking elements, means on the other of said intermediate and braking elements defining a zigzag path along which said follower element is constrained to move upon actuation by said responsive means, whereby said braking element is oscillated about its pivot and thereby brakes movement of said intermediate element and thus also said movable element over the final portion of movement of said movable element.
  • said intermediate element comprises a two-armed lever having one arm actuatable by said movable part and supporting said follower element on its other arm.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Shutters For Cameras (AREA)
  • Cameras In General (AREA)
  • Braking Arrangements (AREA)
  • Transmission Devices (AREA)
US95070A 1970-05-06 1970-12-04 Cushioning device for mechanical details in photographic cameras and similar precision apparatus Expired - Lifetime US3703945A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE06233/70A SE332751B (enrdf_load_stackoverflow) 1970-05-06 1970-05-06

Publications (1)

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US3703945A true US3703945A (en) 1972-11-28

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US95070A Expired - Lifetime US3703945A (en) 1970-05-06 1970-12-04 Cushioning device for mechanical details in photographic cameras and similar precision apparatus

Country Status (3)

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US (1) US3703945A (enrdf_load_stackoverflow)
DE (1) DE2062232C3 (enrdf_load_stackoverflow)
SE (1) SE332751B (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5722169Y2 (enrdf_load_stackoverflow) * 1976-04-19 1982-05-14
DE2632944C3 (de) * 1976-07-22 1981-05-21 Rollei-Werke Franke & Heidecke Gmbh & Co Kg, 3300 Braunschweig Schlitzverschluß für eine fotografische Kamera

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US643286A (en) * 1899-07-31 1900-02-13 Edward P Feiker Fire-escape device.
US2981388A (en) * 1958-02-05 1961-04-25 Renault Anti-backing devices for vehicles
US3004481A (en) * 1957-07-02 1961-10-17 Gauthier Gmbh A Photographic camera with electric exposure regulator
US3053041A (en) * 1958-08-14 1962-09-11 Gamewell Co Vibration-resistant escapements
US3138343A (en) * 1962-04-25 1964-06-23 Penn Fishing Tackle Mfg Co Fishing reels

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US643286A (en) * 1899-07-31 1900-02-13 Edward P Feiker Fire-escape device.
US3004481A (en) * 1957-07-02 1961-10-17 Gauthier Gmbh A Photographic camera with electric exposure regulator
US2981388A (en) * 1958-02-05 1961-04-25 Renault Anti-backing devices for vehicles
US3053041A (en) * 1958-08-14 1962-09-11 Gamewell Co Vibration-resistant escapements
US3138343A (en) * 1962-04-25 1964-06-23 Penn Fishing Tackle Mfg Co Fishing reels

Also Published As

Publication number Publication date
DE2062232A1 (de) 1971-11-11
SE332751B (enrdf_load_stackoverflow) 1971-02-15
DE2062232B2 (de) 1973-03-29
DE2062232C3 (de) 1973-10-11

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