KR890001453B1 - Steel camera - Google Patents

Abstract

The still camera includes a housing having a film compartment with a cassette-chamber at one side of an imaging station and for receiving a film cassette with an apertured film leader extending from it. It has film guide rails on opposite sides of the imaging station against which the film can be flattened. A take-up spool chamber is disposed on the opposite side of the imaging station and has a take-up spool. The take-up spool has a slot for accepting a film leader to be manually inserted into the slot. The slot has hook for capturing the apertured portion of the film leader. The camera further has a door movable between a film compartment closing position and a film compartment exposing position.

Description

Still camera with positioning control system of film winding sprue

1 is a perspective view of a rear-loading 35mm camera showing that the door is opened to insert a film and the film leader insertion slot of the winding sprue is properly positioned for film insertion.

FIG. 2 is a partial perspective view of the winding sprue shown in FIG. 1 showing a fan cam attached to the winding sprue to rotate the filler switch in accordance with the position of the winding spun relative to the camera housing.

3 is a representative circuit diagram for automatically winding the sprue by positioning the associated internal electric motor drive means upon opening the camera door in the shape shown in FIG.

4A shows a front view of a portion of the FIG. 1 camera in which the film seal is opened and the winding sprue is positioned appropriately for film insertion.

4 (b) shows the winding sprue according to lines 4 (b) -4 (b) of FIG. 4 (a), showing that the winding sprue is properly positioned for film insertion before the film reader is inserted into the slot. Partial section view.

4 (c) is a partial cross-sectional view of the winding spoof of FIG. 4 (a), which shows that the film reader is loosely caught in the winding sprue before closing the camera door.

Fig. 4 (d) is a partial cross-sectional view of Fig. 4 (c) showing the winding sprue which shows the state after the winding sprue is partially rotated in the film advancing direction.

FIG. 5 is an enlarged cross-sectional view of the winding spoof and film only of FIG.

* Explanation of symbols for main parts of the drawings

12 housing 13 clasp

14: door 16: cassette storage room

18, 20: film guide rail 22: winding spool

24: film reader insertion slot 26: hook

42: fan cam 48: fan-shaped cutout

59: sensor blade 52: sensor contact

The present invention relates to a 35mm type still camera with a swing-open back door that exposes the interior of the camera housing for film insertion when opened, and more specifically, a winding sprue when the winding spool is rotated. A still camera having a unique winding sprue which ensures the capture and capture of a film leader in the slot of the slot and a positioning control system for the winding sprue.

In the field of battery-operated 35 mm cameras, there are several types of means by which the film can be loaded quickly and easily into the camera. Several kinds of methods have been used to achieve this. One of them is shown in US Pat. No. 4,416,525. A film reader with a slotless winding sprue with only one or more film-joining catch hooks projecting slightly radially, wound around the winding spool by a sprocket driven by a slip clutch when the shutter release button is pressed. It is arranged to catch and hang. In a camera of this configuration, the user does not have to bother about inserting the film reader through the slots of the winding sprue, but the hook on the sprue protruding into the slot sometimes does not capture the film hole as in a normal camera. There is a case where the film cannot be advanced. Such film capture failure is believed to be due to the fact that slots and capture hooks are not ideally positioned or formed to ensure capture of the film reader.

In the patent described above, the take-up sprue is driven at a high speed relative to the cassette take-up speed during rewind, so that the catch hook releases the film without tearing during rewinding, thereby automatically peeling off the film. In the case where cost reduction is the main purpose, as in the case of the present invention, the user needs to put the film reader into the slot of the winding sprue, but the film reader capture reliability is cheaper than the structure of the patent. It is greatly improved by its features.

Another less preferred conventional method for film capture of winding spoofs is the use of friction coatings, such as synthetic rubber coatings around the winding spoof, and loading gates and feed shoes to allow the film to be wound during the initial film reader process. It is supplied to the spoof so that it is firmly wound at least one round around the wound spoof. These prior arts are inherently complex and tend to be costly as opposed to conventional methods of inserting the film into the wound through suitably positioned capture slots in the winding sprue.

In the motor-driven camera embodiment of the present invention (as is not necessary in the broader aspects of this invention) as in the camera of the patent, any form of tension sensing film supply control device may be provided in the camera, wherein the winding sprue If a sudden film tension generation at the end of the film inside is detected by one means, film advancement is no longer possible or the camera automatically switches to the rewind drive mode, and the film is automatically rewound into the cassette. Such tension sensitive devices impose a significant load on the winding sprue drive and the winding sprue itself, so that the winding sprue must be strong enough to withstand the subsequent tension spikes. A simple, hard and small monolithic winding sprue which is preferably made of a single plastic molded part and which can absorb a surge of tension without breaking is a preferred feature in the most preferred form of the present invention.

Prior to the present invention, it is easily loaded under bad rough conditions without the use of special guide shoes or related equipment, and maintains the necessary structural integrity with a small diameter winding spoof under high stress conditions and is of simple, low cost structure. Inexpensive film capture systems have not been provided for rearloaded 35mm cameras.

According to one aspect of the invention, the camera is a motor-driven winding sprue having a wide hole with a film engaging hook and a film capture slot, and the positioning of the winding sprue so that the slot of the winding sprue is disposed of the film reader And preferably motor-driven means to be in the optimum position for capture. In a preferred form of the invention in which the camera uses an electric motor for film rewinding and rewinding, the winding sprue is automatically moved to the optimum position by the same motor in response to the opening of the camera loader accompanying the film loading operation. To this end, a position sensing switching means is provided in connection with the winding sprue and the motor is operated with the door operated switch to cause the winding sprue to partially rotate to the ideal loading position.

According to a particular aspect of the present invention, the slots of the winding sprue have a unique size and shape. Thus, as in the case of winding spoofs shown in US Patent Application No. 477, 247 (US Pat. Nos. 4, 525, 048), a hook is formed in the cylindrical thin hollow cylinder that forms the winding spoof and the hook inwards considerably. Instead of protruding narrow slots, the slots of the present invention are much wider and the catch hooks project only slightly into the slots. The slot is also preferably formed in a winding sprue which is a thick walled hollow cylindrical synthetic resin molded part. The slot, which will be described in detail later, allows for a unique arrangement and structure of the catch hook. In addition, the winding sprue can receive the force generated in the winding sprue when the film tension sensing means is installed in the camera as described above.

The concept of providing a means for positioning the winding sprue to a precise optimum position by an electric motor drive in response to the opening of the film door is described in U.S. Patent Application Nos. 477,247 (US Pat. No. 4,525,048). ). The invention described herein applies to a half frame, drop-in reload camera. Unlike conventional 35mm full frame cameras, the film cartridge and film reader are inserted at the edges into small slots and holes in the camera housing end wall, and once the cartridge is placed inside the camera, the user has no access to the film reader. Can't. The slots of the winding sprue do not need to be completely visible to help the user match the film reader in the slots opened to the axial ends of the winding sprue.

Once the winding sprue is properly positioned, the film reader insertion slot is automatically aligned with the other slots on the camera end wall so that the film leader is guided into the slot of the winding spool when loading the film into the camera. Automatic sprue positioning means are essential here. Thus, providing an automatic means for positioning the winding sprue at a predetermined position where the invisible slots are aligned with the film reader end face makes it possible to fully see and approach the slots of the winding sprue and the film reader. This does not necessarily mean the automatic positioning feature of the camera.

In a preferred form of the invention, the winding sprue is automatically moved to its ideal position when the film chamber door is opened to completely exit the film chamber. The user simply inserts the film cassette into the cassette compartment so that the end of the film reader is placed in the slot of the winding sprue without any special fitting action. When the door is closed, pressure is applied to the film reader so that the film reader is placed in the ideal position captured by the hook of the winding spool as soon as the winding sprue is rotated in the film locking direction. Film advancement is automatically initiated by the closing door or subsequent action of the shutter release button.

Preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 shows a generally conventional electrically operated camera to which the principles of the present invention are applied. The camera 10 comprises a housing 12 with a cassette compartment 16, a winding sprue 22, a pair of film guide rails 18, 20 integral with the housing 12, and a film forward measuring sprocket. 30, the push button 28, which actuates the shutter and automatically initiates the advancement of the subsequent film by the battery motor drive means (not shown), and the film reader (tip) are released to wind up the sprue 22. Characterized in that there is a film termination switch member 31 to disconnect the motor drive system when separated from the. Also shown is a hinged revolving open film chamber closing door 14 that is secured in a closed position by the latch 13, which flatly presses the film against the film guide rails 18 and 20 when the door is closed. A conventional pressing plate 36 hangs on the door. In particular, the switch members 34 and 32 installed in the housing are respectively coupled to the projection 38 or the shelf 40 formed integrally with the door 14 so as to be operated in response to the opening or closing of the door 14. Consists of.

The switch member 34 at the top may be connected with conventional switching reset means for rearranging the electronic circuit (not shown) of the camera from the film rewind state to the front film advance state as the door 14 is opened or closed. . The lower switch member 32, which is operated similarly as the door 14 moves between the open and closed positions, is wound up so that the film reader insertion slot 24 is properly oriented outwards for the next film loading action. It serves to operate a special drive circuit for driving the pool 22.

The winding sprue 22 is shown as a thick cylindrical wall with a very wide film reader insertion slot 24 at the end with distant end walls 70, 72. The slot 24 and the catch hook 26 are shown in detail in the various steps of the capture section in FIGS. 2 and 4 (a) to 4 (d). 4 (a) shows that the direction of the film reader insertion slot 24 is properly positioned to fit the film reader with the front wall of the camera housing down and the film chamber open over the housing. FIG. 4 (b) is a partial cross-sectional view of the winding sprue shown in FIG. 4 (a), with the film reader insertion slot 24 positioned directly outward from the housing 12. FIG.

The film reader insertion slot 24 is slightly longer than the width of the leader end of the standard film 62 so that the edge holes 64-64 are closed when the leader end is inserted into the slot 24. It is properly aligned with respect to the catch hook 26. In particular with regard to the shape of the slot and the relationship between the slot and the horizontal plane of the guide rail 20 (see FIG. 1), the slot has two inwardly extending walls 56, 58 in its longitudinal direction. You will notice that) is formed. Thereafter, the walls are called the front wall and the back wall, respectively. The front wall 56 extends in a substantially vertical direction, is formed by cutting the radially roughly wound winding spun cylinder in a substantially radial direction, and passes into a cylindrical film reader accommodation chamber having an inner wall 60. On the other hand, the back wall 58 is arranged to be positioned approximately horizontally (thus the back wall is at an angle with respect to the radial line). In addition, the back wall does not coincide with the face of the captured film reader, so that at most only the innermost part in the radial direction of the back wall 58 is in contact with the film before starting the advancement of the film reader.

The rear wall 58 has a hook 26 extending partially in the circumferential direction at one end thereon, the hook extending in the film cell direction. The outer circumference 26a of the hook 26 is continuous with the cylindrical outer circumference of the winding sprue, and ends at the inclined surface 26c that forms the film hole trapping point, that is, the leading edge 26b. As seen from just above the film reader fitting slot 24 (FIG. 4 (b)), it is noted that the leading edge 26b of the hook 26 extends slightly beyond the rightmost projection of the rear wall. 4 (c) shows the film reader extending beyond the position shown in FIG. 4 (b) such that the hook 26 captures one of the edge holes 64 of the film. When the door is open, the film loosely extends on the guide rail 20. It is not yet in contact with the film 62 of the outermost part in the radial direction of the rear wall 58. 5 shows in more detail the portion of the winding sprue 22 in this trapped state.

4 (d) shows the arrangement direction of the film and the winding sprue after the initial film advancement is appropriately performed, where the entire rear wall 58 comes into contact with the proximal surface of the film 62. The film is now fully caught in the capture hook 26 and is thus completely flat with respect to the face of the back wall 58. Winding sprues with relatively thick walls have adequate mechanical strength. If the rear wall 58 is not inclined with respect to the film capture area as shown in Figure 4 (c), then the rear wall, which is similar in structure to the front wall 56 and is generally radially arranged, causes the film to be hooked to the hook 26. It will not jam and may result in a loss of film feed or loss of film.

In particular, in FIG. 4 (b), the relative arrangement of the front wall 56 and the rear wall 58 causes the initial insertion angle range of the film reader to be relatively widened, so as to ensure the capture of the film. It can be seen that the orientation need not be accurate. The effective insertion area of the winding sprue 22 is thus increased without substantially compromising the structural integrity of the winding sprue. This geometry also allows the hook 26 to provide a firm grip over a longer distance than the radially positioned front wall 56, which is effective between the hook 26 and the rear wall 58. This is because the locking area is considerably larger than the thickness of the ring portion formed between the outer surface of the winding sprue 22 and the inner wall 60 of the sprue. By this means, additional strength is imparted to the winding sprue.

For the winding sprue positioning system mentioned above, FIG. 2 shows the winding sprue 22 in partial form, which is a mounting shaft 44 attached to a conventional bearing and drive means (not shown). ), 46 and a fan cam 42 attached to one end of the shaft. The fan-shaped ablation portion 48, which constitutes the inward extension of the radial portion of the outer surface of the cam 42, is slidably engaged with the sensor blade (blade) 50 of a suitable shape, so that the winding sprue is driven by the motor driving means. When rotated, the sensor blade 50 is vibrated between the end positions along the arrangement direction of the cam 42. The sensor contacts 52 are arranged to face the sensor blade 50, and these two contacts, ie the sensor contacts and the sensor blade, constitute the elements of the switch S2 (see FIG. 3). Until the winding sprue is rotated to the proper position as shown in FIG. 1 (see also FIG. 4 (a)), the sensor blade 50 is retracted into the open circuit state, and the sensor blade during rotation of the winding sprue 22 ( 50) and the sensor contact 52 remain closed to complete the electrical circuit between them.

3 shows a circuit for automatically manufacturing the position of the winding sprue 22 when the door 14 is opened after rewinding the film. A modified motor drive film run control circuit is shown. Typical parts of this circuit are represented by a film progress control circuit (FACC), which is powered by the battery (B) and is adapted to the operation of the switch (S3) connected to the push button (28). In response, the relay coil R is operated for a predetermined time via the conductor L1. The conductor completes the circuit from the relay coil R to the opposite side of the power supply B. FIG.

The movable contactor (c) of the monopole two-way relay actuated contact is optionally short-circuited across the motor (M) connected between the terminal (a) of the switch (S4) and the movable contactor (c) to stop film progression. Or apply driving power from the battery B to the motor M when the movable contactor c contacts the terminal b. The control of the motor direction is regulated by the polarity changeover switch PRS, whose switching state is in response to the internal switching condition of the film progress control circuit FACC. The film advancing control circuit FACC is a setting (setting) of the film end detection switch connected to the film end switch member 31 of FIG. 1, and a door operation switch SR operatively connected to the door operation switch member 34. According to the setting of, it is reset to a forward arrangement by a known means. Means for performing such programmed switching of motor drive polarity via polarity switching switch PRS in accordance with such switch sensing are well known in the art.

In the present invention, the film advancing control circuit is preferably designed to set the polarity changeover switch (PRS) to forward (forward) polarity when the film regulator is finished, so that when the camera door is opened, the switch member 32 is associated with it. The switch S1 is closed. If the position of the film reader insertion slot 24 (FIG. 2) is not properly adjusted, the switch S2 composed of the sensor blade 50 and the sensor contact 52 is in a closed circuit state. Therefore, when one end of the relay coil R is grounded and the relay is operated, the movable contactor C comes into contact with the terminal b. Thus, electric power is transferred from the battery B to the motor M. FIG. Therefore, the winding sprue is immediately activated until the sensor blade 50 is separated from the sensor contact 52 by the fan cutout 48 of the cam to cut off the circuit and terminates the motor driving force. . At this point, the film reader insertion slots 24 face outwards to accommodate film insertion.

In this way, a comfortable and inexpensive system has been described that has all the advantages of small diameter winding sprues, overcomes the major drawbacks already outlined in the previous prior art background, and securely fits the film into a 35mm camera with a revolving open door. . By automatically positioning a single slot of the winding sprue in the optimum position for accommodating the film reader, and also by optimally adjusting the dimensions of the slot itself, the slot forming wall and the catch hook, solving the problem described above. Reliable and inexpensive systems are provided.

While the present invention has been described with reference to the preferred embodiments, those skilled in the art will understand that many changes can be made and equivalents may be substituted for elements of the invention without departing from the scope of the invention. . In addition, many modifications may be made to adapt a particular situation or material to the principles of the invention without departing from the essential scope thereof. Thus, the claims of the present invention are not intended to be limited to the specific embodiments disclosed as the best mode for carrying out the invention, but to include all embodiments and equivalents falling within the scope of the general principles disclosed herein.

Therefore, for example, various sensing means can be used for the cam-operated slot positioning switch described above. Variants such as suitably arranged commutator switches can be used equally and other various electrical sensing means including optical sensing means can also be used. Furthermore, although the present specification is directed to actuating the motor driving circuit instantaneously to redirect the winding sprue by driving the winding sprue in the forward direction, ie, the film advancing direction, in response to the switching circuit operating with the opening of the door. Although described, a very similar circuit that responds to the operation of the film termination sensor that terminates the film rewinding operation may be readily devised.

Alternatively, the door latch 13 itself may be connected to the switching means S1 '(FIG. 1), allowing the reorientation drive to be activated when the door is unlocked. Indication of the actuation switch of FIG. 3 as "S1 / S1 '" indicates that this switch can be placed in either of two positions. In addition, once the film is separated after rewinding, the switching circuit may be adapted to continue the rewinding operation of the winding sprue until the position of the winding sprue is adjusted appropriately. In short, the switching means responding to the end of film, or to the operation accompanying opening the camera door, may cause the winding sprue in either the forward or rewind direction to adjust the position of the slot for the next loading operation. Can be used to drive

Claims (14)

A housing with a film chamber on one side of the imaging section, with a cassette compartment for accommodating the film cassette in which the perforated film reader extends, and film guide surfaces on both sides of the imaging section for flattening the film, by hand Has at least one slot for receiving the film reader and at least one hook for capturing the hole portion of the film reader inserted in each slot, the hook being able to most effectively capture the hole portion of the film reader The winding sprue thread opposite the image portion to accommodate the winding sprue which can be moved to a given most ideal position, the film thread closing position and the cassette compartment and winding sprue are exposed for cassette and film reader insertion. A door that can move between the film chamber open positions and that presses the film flat against the guide surfaces when closed; In a still camera comprising an electric motor drive for driving the winding sprue in at least the film traveling direction to supply a subsequent frame of new film to the imager, and a rewind drive for rewinding the film from the winding sprue into the cassette. The winding sprue 22 at a position different from the ideal position to momentarily operate the motor drive M to position one of the slots 24 of the winding spool in the ideal position. Camera, characterized in that it has a switching system (42, 50, 52, S2, 32, S1) in response to the position of. 2. The winding system of claim 1, wherein the switching system is coupled to the door (14) to move the winding sprue as the door moves to the film chamber open position when the winding sprue is in a different position than the ideal position. A camera enabled to actuate the motor drive to be disposed in the camera. The cam system of claim 1, wherein the switching system comprises a cam 42 which rotates with the winding sprue and operates the switching system 50, 52, S2 between the open and closed positions according to the angular position of the winding sprue. Including camera. The camera according to claim 2, wherein the door (14) is adapted to press the film (62) flat against the guide rails (18, 20) when closed. 3. The winding sprue 22 according to claim 2, wherein the winding sprue 22 has a space extending therein axially, wherein the slot is an approximately axial extension passage 24 communicating between the outer surface of the winding spool and the space. A pair of substantially opposite axial extension walls 56, 58 which are spaced apart from each other in an outward direction away from the axis of rotation of the winding sprue, with the passageway being spaced apart from the two distant end walls 70, 72; Camera formed by. 6. The camera according to claim 5, wherein said slot-forming passages (24) are generally directed in the direction of said image portion and film guide surfaces at said ideal position of said winding spoof. 7. The cylindrical surface of the winding spool according to claim 6, wherein the winding sprue has a cylindrical outer surface, and the axially extending wall 56 of the passage that is farthest from the image portion when the winding sprue is in an ideal position. The other axial extension wall 58 of the passage, which extends substantially radially with respect to the image portion, forms an axially extending surface at a substantial angle with the radial surface, and the hook 26 being the A camera which is a projection from the axial extension wall 58. 8. The camera of claim 7, wherein the hook protrusion has a cylindrical outer circumference that is continuous with a cylindrical outer circumference of the winding spoof and ends at a substantially radially extending surface to form a film reader hole capture tip facing away from the image portion. 7. The hook (26) of claim 6, wherein said hook (26) protrudes from said axial extension wall (58) closest to said image portion and away from said or image portion when said winding spoof is in an ideal position. Camera with facing hole capture tip. 10. The axial extension wall (58) closest to the image portion has a radially innermost portion thereof in contact with the film during initial film advancement after film loading and subsequent to initial film advancement after loading. The camera is shaped so that substantially the entire remainder of the wall (58) is in contact with the film portion during advancing. A film winding spool 22 adjacent to the imaging section and having at least one slot 24 for receiving and capturing the end of the inserted film reader, and the winding sprue to the selected ideal loading position of the slot. In a camera having a winding sprue rotation system (M, 42, 50, 52, S2, 32, S1) for rotation; The winding sprue has an inner space extending in the axial direction, and the slot consists of an approximately axially extending passageway 24 which communicates between the outer surface of the winding sprue and the space, the passage being two Formed by distant end walls 70, 72 and a pair of axial bricks 56, 58 that are spaced apart from each other in an outward direction away from the axis of rotation of the winding sprue, the winding sprue being in this ideal position. The axial extension wall 58 which is closest to the image portion when is at is provided with a hook 26 extending circumferentially from the wall in the film advancing direction, and the axial extension wall 58 is connected to the hook. Virtually advancing the wall during advancing, following the initial film advancement, only the innermost portion of the wall in contact with the film during initial film advancement after capturing the film And the rest of the sieve is shaped to abut the portion of the inserted film. The camera according to claim 1 or 2, wherein said winding sprue has only a single axial slot (24). 4. A latch (13) according to claim 1 or 3 is provided which is operable between a locked position and an unlocked position so as to releasably lock the door in a closed position, and the switching system (S1, S1 ') is provided. Responsive to the operation of the door from the locked and closed state to the film chamber exposure position when the winding sprue is in a position different from the ideal position so that the motor drive M can be operated to place the winding sprue in the ideal position. Connected camera. 12. The camera of claim 11, wherein said winding sprue has only one axial slot (24).

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