JPH0320823Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film guide device used in a camera in which a cartridge is loaded into a cartridge chamber from the axial direction.

To simplify film loading, a cartridge insertion port and a film insertion port are opened on the bottom or side of the camera body, and the film can be loaded by dropping the cartridge in the axial direction from the cartridge insertion port. A camera that does this has been proposed. As described in Utility Application No. 57-147144, the film guide device used in this camera has a U-shaped plane and is attached to the camera body to form a film insertion opening. A device has been proposed that includes a holder, a film pressure plate located inside the pressure plate holder, and a pressure plate support member having elasticity for attaching the film pressure plate to the pressure plate holder. When loading film, the leader part that has been pulled out from the cartridge beforehand often gets caught on the film feeding belt, but in the film guide device mentioned above, the pressure plate holder is attached to the camera body to prevent deformation.
If you forcefully insert the film, the part that is caught on the film feeding belt will bend. If the side of the film's leader section bends inward in this way, the roll will become thicker when it is wound onto the take-up spool, making it impossible to wind the film with a large number of frames in the middle. It ends up. Particularly, in a type of camera that detects that film transport has stopped and automatically rewinds the film by reversing the motor, rewinding is performed from the middle of the film. Furthermore, this curved portion gets caught in the entrance of the cartridge during rewinding, making it difficult to wind it into the cartridge.
Then, when the motor rotates forward for at least one frame to set the shutter mechanism after rewinding,
Since the leader part protruding from the cartridge is wound up again, the cartridge cannot be taken out.

The purpose of the present invention is to solve the above-mentioned drawbacks, and by imparting spring properties to the pressure plate holder, the pressure plate holder comes into contact with the film leader when it curves to get over the film feeding belt. A part of it is made to stand out.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of the camera with the back cover open.
The camera body 1 has a film exposure window 2 approximately in the center, a cartridge chamber 3 and a take-up chamber 4 are formed on the left and right sides of the film exposure window 2, and a photographic lens 5 is provided on the front surface.
is installed. The cartridge 6 is loaded into the cartridge chamber 3 through a cartridge insertion port 3a opened at the bottom of the camera body 1. The cartridge 6 stored in the cartridge chamber 3 has a rewind claw 7 inserted into its spool shaft 6a.

A substantially L-shaped pressure plate holder 9 is located behind the cartridge chamber 3 and the film exposure window 2, and is fixed to the camera body 1 with screws 10. The pressure plate holder 9 is located below the film exposure window 2, extends in the film transport direction, and includes a first piece 9a whose free end has spring properties so that it can be bent to some extent, and a cartridge chamber 3. A second piece 9b is located above and extends in a direction perpendicular to the first piece 9a. This pressure plate holder 9 can be made of plastic.

A film pressure plate 15 is attached to the pressure plate holder 9 in a cantilevered manner via a pressure plate support member 14 . This pressure plate support portion 14 has a rectangular frame portion 14
a and an arm portion 14b, and is provided with spring properties. One side of the rectangular frame portion 14a is fixed to the second piece 9b of the pressure plate holder 9, and the opposite side is fixed to the film pressure plate 15, respectively. The pressure plate supporting member 14 is deformed so that the lower part of the film pressure plate 15 is slightly raised in order to prevent the film 13 from entering the back surface of the film pressure plate 15 when the cartridge 6 is loaded. The film pressure plate 15 has a long hole 15a.
is formed so that a film transport belt 16 installed on the camera body 1 can fit therein. The film transporting belt 16 has protrusions 16a formed at a constant pitch on its outer peripheral surface, and engages with the perforation 13a of the film 13 to transport the film 13.

As shown in detail in FIG. 2, the winding chamber 4 includes a flange 18a and a perforation 13a.
a take-up spool 1 having a pawl 18b that engages with the take-up spool 1;
8 and a film guide plate 19 are provided. The film guide plate 19 is curved to guide the leading end of the film 13, and supports a film pressing roller 20 at its leading end. Further, the film guide plate 19 is urged clockwise by a spring 21 to bring the film 13 into close contact with the outer periphery of the take-up spool 18, so that the leading end of the film 13 is wound around the outer periphery of the take-up spool 18 as is well known. be able to.

The back cover 22 is pivotally attached to the camera body 1 via a pair of arms 23 and 24 fixed to both ends thereof, and is opened centering on the upper part of the camera body 1. When the lock release lever 25 is slid to the left, the locking claw 26 and the back cover 22 are unlocked, and the back cover 22 opens under the action of the release lever 27. This camera back 2
2 includes a viewing window 28 for viewing the display on the cartridge 6, such as the film sensitivity and the number of film frames, a spring plate 29 for pressing the film pressure plate 15 from behind, and a plurality of guide members 30 for guiding the leading edge of the film 13. It is provided.

A resilient film guide plate 31 is rotatably provided between the film exposure window 2 and the take-up chamber 4, and its leading end falls into the film exposure window 2 when the film is loaded. When the film 13 is transferred, it is pushed by the tip of the film 13 and pivots clockwise, so that the film 13
The leading end of the winder can be inserted into the winding chamber 4. Flat surfaces 32 and 33 above and below the film exposure window 2 are for positioning the film pressure plate 15, and the film 13 is placed between the positioned film pressure plate 15 and the rails 34 and 35.
is located. Note that reference numeral 36 is a tapered surface for guiding the film 13 when taking out the cartridge 6, and reference numeral 37 is a battery cover.

FIG. 2 is a bottom view of the camera body. Back cover 2
When the camera body 1 and the pressure plate holder 9 are opened, a film insertion opening 12 is formed between the camera body 1 and the pressure plate holder 9, and a film 13 is inserted through this opening. Note that the reference numeral 38 is a battery compartment.

Push the cartridge 6 in the axial direction and insert it from the cartridge insertion opening 3a. When inserting this cartridge 6 into the cartridge chamber 3, the film 13 enters through the film insertion opening 12, and the film exposure window 2
and the film pressure plate 15.

As shown in FIG. 3, when the back cover 22 is closed after loading the cartridge 6, the film pressure plate 15 is pressed from behind by the spring plate 29 and comes into contact with the surfaces 32 and 33. The film 13 is attached to a pair of rails 34 and 35.
and the film pressure plate 15.
When the back cover 22 is completely closed, it is locked by the locking pawl 26, and at the same time a part of the back cover 22 closes the detection lever 3.
9 is pressed to turn on a switch (not shown).
When this switch is turned on, the take-up spool 18
A built-in motor rotates to rotate the film feeding belt 16 and the take-up spool 18. The film feeding belt 16 has its protrusion 16a engaged with the perforation 13a of the film 13 to feed the film 13 into the take-up chamber 4. The leading edge of the film 13 is held by a film pressing roller 20.
The perforation 13a is pressed against the outer periphery of the take-up spool 18, engages with the pawl 18b, and is wound onto the take-up spool 18.

When the blank feed pieces are continuously wound up, the motor stops rotating. From then on, each time you press the release button (not shown) to take a picture, the film 1
3 is wound up one piece at a time. When all the frames have been photographed, the motor automatically reverses and the rewind claw 7
and rotates the take-up spool 18 to remove the film 13.
can be rewound into the cartridge 6.

FIG. 4 shows the state in which the film is inserted. When dropping the cartridge 6 into the cartridge chamber 3 with the bottom of the camera body 1 facing up, the film 13 is inserted into the film insertion slot 12 as shown in A. As shown in B, since the film 13 is curved due to the winding, its side portion 13b
often gets caught on the film transport belt 16. However, when the film 13 is pushed further, the film 13 is bent and the film feeding belt 16
can overcome. When this film 13 is bent, the first arm 9a of the pressure plate holder 9
Since the film 13 is pushed by the film 13 and can escape backwards, the side portion 13b of the film 13 does not bend inward.

FIG. 5 shows another embodiment of the invention. For autoloading cameras, film 1
The leader portion of No. 3 is guided along the outer circumference of the take-up spool 18, and the perforation 13a of the leader portion quickly reaches the take-up spool 18.
It is necessary to engage the pawl 18b of the leader, thereby preventing the leader from becoming sagging and becoming thick. Therefore, in this embodiment, a flexible guide plate 40 whose tip is curved so as to come into contact with the outer periphery of the take-up spool 18 and has higher springiness than the film 13 is fixed to the film pressure plate 15. The guide plate 40 is made of a plastic film such as Mylar or a metal plate, and is processed into a shape that will not damage the film 13.

As shown in FIG. 6A, since the guide plate 40 is in contact with the outer periphery of the take-up spool 18, the leader portion of the film 13 is pressed against the outer periphery of the take-up spool 18, and the perforation 13a is pushed against the claw 18.
b can be reliably engaged. In order to increase the pressing force at the tip of the guide plate 40, the back cover 22
It is desirable to provide a convex portion 41 at the top. B shows a state in the middle of winding the film 13. When the winding diameter of the film increases, the guide plate 40
Because it has a soft waist, it can be deformed according to the film diameter.

In the present invention having the above configuration, when a part of the film gets caught on the film feeding belt and bends when loading the film, the pressure plate holder can escape to the rear, so that the film will not be bent. Therefore, it is possible to solve various problems that have conventionally occurred, such as the film becoming thick due to bending and making winding impossible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a camera embodying the present invention. FIG. 2 is a bottom view of the camera body showing the winding chamber in cross section. FIG. 3 is a sectional view of the camera with the back cover closed. FIG. 4 is an explanatory diagram showing the loading state of the film. FIG. 5 is a perspective view showing another embodiment of the present invention. FIG. 6 is a sectional view of the winding chamber showing the film winding state. 1...Camera body, 2...Film exposure window,
3... Patrone chamber, 4... Winding chamber, 5... Photographing lens, 6... Patrone, 9... Pressure plate holder, 9a... First piece, 9b... Second piece, 12
...Film insertion slot, 13...Film, 14...
...Pressure plate support member, 14a... Rectangular frame, 14b...
... Arm part, 15 ... Film pressure plate, 16 ... Film feeding belt, 18 ... Winding spool,
18b...nail, 22...back cover, 34, 35...rail, 40...guide plate, 41...convex portion.

Claims (1)

[Claims for Utility Model Registration] (1) A spring-like structure located below the film exposure window and extending in the direction of film transport while maintaining an appropriate feel so as to form a film insertion slot between the camera body and the camera body. approximately L, which is made of
a pressure plate holder having a shape of a letter; a pressure plate support member having a spring property and having one end fixed to the second piece and supported by the pressure plate holder in a cantilevered manner; and a film pressure plate held by this pressure plate support member. A film guiding device characterized in that the film pressure plate can be retracted in a direction away from the film exposure window due to the elasticity of the pressure plate support member. (2) The film guide device according to claim 1, wherein the pressure plate holder is made of plastic. (3) The pressure plate support member includes a rectangular frame portion and an arm portion, one side of the rectangular frame portion is fixed to the pressure plate holder, and the opposite side is fixed to the film pressure plate. A film guide device according to claim 1 of the patent registration claim. (4) The film according to claim 1, wherein the film pressure plate includes a flexible guide plate for guiding the leading end of the film to the outer periphery of a take-up spool. Guidance device. (5) The film guide device according to claim 4, wherein the guide plate is made of plastic film and is curved so that its leading end comes into contact with the outer periphery of the take-up spool.