# US 4,396,164 A · Easy loading mechanism for cameras > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,396,164 A - Document ID: US4396164A - Status: Granted - Kind: A - Application number: 06/252,651 - Filed: 1981-04-09 - Granted: 1983-08-02 - Earliest claimed: 1980-04-11 - Assignees: Minolta Camera Kabushiki Kaisha - Inventors: Keisuke Maeda; Akira Yamanaka - Web page: https://patentgrep.com/patent/US4396164A ## CPC - G03B 17/30: Locating spools or other rotatable holders of coiled film - B65H 75/28: Arrangements for positively securing ends of material - B65H 2301/414225: fixed to shaft or mandrel, e.g. clamping or pinching leading edge to shaft or mandrel - G03B 2217/261: Details of spools - 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 (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES ## Abstract A camera film easy loading takeup spool includes a body member rotatable about a longitudinal axis past a film delivery position and a plurality of peripherally spaced pairs of longitudinal jaw members, one of each of which is swingable about a longitudinal axis between film entry opening open and closed positions relative to the respective other jaw member and spring biased to its open position and including a depending follower engaging a circular cam which closes the jaws offset from the film delivery position and permits the spring opening of the jaw proximate the film delivery position. A film perforation engaging tooth or a friction pad is carried by one of each pair of jaws and the inner ends of the jaws delineate an inner passageway of a width equal to about the film thickness. A visual indicator is actuated when any one of the jaw members is open. ## Claims ### Claim 1 A camera film takeup spool mechanism comprising: a body member rotatable about a longitudinal axis peripherally past a predetermined film delivery position and including a pair of jaw members having confronting faces delineating a film passageway, said jaw members being relatively transversely movable between an open position providing a relatively wide entry opening to said film passageway such that said film passageway delineating faces converge at the passageway end remote from said entry opening and a closed position providing a relatively narrow opening such that film is held between said jaw members; shifting means responsive to the angular position of said body member for shifting one of said jaw members to said closed position when said body member is displaced from a predetermined position and for shifting said jaw members to said open position when said body member is at said predetermined position; and engaging means for providing, at the interior of said film passageway, a predetermined clearance and frictionally engaging a film leader traversing said film passageway and inserted in said clearance. ### Claim 2 (depends on 1) The mechanism of claim 1 wherein said predetermined clearance is of a width approximately equal to the film thickness. ### Claim 3 (depends on 1) The mechanism of claim 1 wherein a first of said jaw members is swingable about a longitudinal axis between jaw entry open and closed positions and the second of said jaw members is stationary on said body member. ### Claim 4 (depends on 3) An easy loading mechanism as set forth in claim 3, wherein said control means includes biasing means for biasing said flap members toward their fully open positions and cam means for moving said flap members against said biasing means. ### Claim 5 (depends on 2) The mechanism of claim 2 wherein said engaging means includes a wall of the second of said jaw members. ### Claim 6 (depends on 3) The mechanism of claim 3 comprising a plurality of peripherally spaced pairs of said jaw members. ### Claim 7 (depends on 6) The mechanism of claim 6 including spring means resiliently biasing each of said first jaw members toward its open position. ### Claim 8 (depends on 7) The mechanism of claim 7 including a film perforation engaging tooth projecting from one of each pair of said film passageway delineating faces. ### Claim 9 (depends on 8) The mechanism of claim 8 wherein said tooth projects from said second jaw member face proximate said passageway entry opening toward said first jaw member. ### Claim 10 (depends on 7) The mechanism of claim 7 comprising a friction pad positioned on one of each pair of said film passageway delineating faces and confronting the other of said faces. ### Claim 11 (depends on 10) The mechanism of claim 10 wherein said friction pad is elastomeric and compressed between said passageway delineating faces in the jaw closed position. ### Claim 12 (depends on 7) The mechanism of claim 7 wherein said shifting means includes a stationary circular cam coaxial with said body member and followers projecting from each of said swingable jaw members into operative engagement with said cam. ### Claim 13 (depends on 7) The mechanism of claim 7 comprising condition indicating means including a member movable between visually distinguishable first and second positions and means responsive to all of said movable jaw members being in closed positions for shifting said indicator member to its first position and responsive to any one of said first jaw members being in its open position for shifting said indicator to its second position. ### Claim 14 (depends on 7) The mechanism of claim 7 wherein said body member includes a circular base, a coaxially spaced circular coupling head and a shaft coaxial with and extending between and integrally rotatable with said base and head, said jaw member pairs being coaxially arranged about to said shaft. ### Claim 15 (depends on 14) The mechanism of claim 14 wherein the peripheral face of said shaft and the confronting inside faces of said second jaw members are spaced along at least a part thereof, a distance about equal to the thickness of the film and defining inner ends of said film passageways. ### Claim 16 An easy loading mechanism for cameras, comprising: a takeup spool body member having a film insertion path into which a film leader is inserted, said takeup spool body member being rotatable about a predetermined axis; a flap member having a face delineating one side of said film insertion path, said flap member being movable between an open position effecting a relatively wide entrance opening to said film insertion path such that said film insertion path contracts approaching its end remote from said entrance and a closed position effecting a relatively narrow entrance opening to said film insertion path, said flap member being supported by said takeup spool body member so as to be rotated therewith about said predetermined axis; control means for maintaining said flap member at its closed position and moving said flap member from its closed to open position when said takeup spool body member is rotated to a predetermined angular position; and engaging means for providing, at the inner part of said film insertion path, a limited clearance and frictionally engaging a film leader traversing said path and inserted in said limited clearance. ### Claim 17 (depends on 16) An easy loading mechanism as set forth in claim 16, further comprising at least one more flap member having a similar construction and function as that of said flap member, and wherein said control means moves only one of said flap members which is positioned at said predetermined angular position to its open position and maintains the other flap members at their closed position. ### Claim 18 (depends on 16) An easy loading mechanism as set forth in claim 16, further comprising an indicating means rotatable about said predetermined axis between a first position for indicating that a film is not wound on said takeup spool body member and a second position for indicating that a film is securely wound on said takeup spool body member, and an indication control means for moving said indicating member in accordance with the position of said flap member so that said indicating member is positioned in its first position when said flap member is in its open position and that said indicating member is positioned in its second position when said flap member is in its closed position. ### Claim 19 (depends on 16) An easy loading mechanism as set forth in claim 16, further comprising an elastic member provided on a side face delineating said film insertion path in cooperation with an opposing side face, said elastic member being capable of pressing against said opposing side face when said flap member is positioned at its closed position. ### Claim 20 (depends on 19) An easy loading mechanism as set forth in claim 19, further comprising a claw provided in the vicinity of the entrance of said film insertion path, said claw having a configuration engageable with a film perforation.