JPH049025A - Film presser mechanism for drop type film loading - Google Patents

Abstract

PURPOSE:To make an entire camera compact and to hold a film with uniform force by constituting a mechanism of a fixed pressure plate which is provided to be opposed to a photographing lens and a specified movable picture frame which holds the film on a photographic plane in cooperation with the fixed pressure plate. CONSTITUTION:This mechanism is constituted of the fixed pressure plate 10 which is arranged at a position opposed to a photographing aperture part or a shutter and fixed to a main body and the movable picture frame 11 which moves and rocks. The part of the frame 11, not one end of the frame 11, is supported by a shaft so as to be able to rock by a rotary shaft 11c which can move in a direction where it separates from/contacts with the plate 10 and the frame 11 is energized by 1st and 2nd springs 11e and 29c in a direction where it separates from/contacts with the plate 10. Thus, the small moving space of the frame 11 is good, the entire camera is constituted to be compact and the film 26 is pressed to the plate 10 with good balance.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention consists of a fixed pressure plate installed facing a photographic lens, and a movable pressure plate that cooperates with the fixed pressure plate to suppress and hold the film on the photographing surface. The present invention relates to a film holding mechanism for drop-type film loading, which is composed of a screen frame and a screen frame.

``Prior Art'' Conventional film holding mechanisms, as seen in commercially available cameras, have a structure in which the film is pressed down in conjunction with the closing operation of the back cover via a spring. There is. A separate mechanism is provided for opening the space in the film loading section.

[Problems to be Solved by the Invention] In the conventional film holding mechanism described above, the pressure plate is only spring-loaded, so in order to secure the space for dropping the film, it is necessary to use the spring-loaded pressure plate A space for moving the film and a space for dropping the film are required, resulting in a poor space factor and a large stroke, resulting in the overall size of the camera. Furthermore, since the pressure plate is simply spring-loaded and no special improvements have been made, there is also the disadvantage that the force for pressing the film is not evenly distributed over the entire surface, resulting in incomplete film retention.

Therefore, an object of the present invention is to provide a film holding mechanism that is simple and compact in structure and that holds the film with uniform force.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a fixed pressure plate provided opposite to the photographing lens, and a film that cooperates with the fixed pressure plate to hold the film on the photographing surface. Consists of a movable screen frame,
The movable screen frame has a portion closer to one end supported by a rotary shaft that is movable in a direction toward and away from the fixed pressure plate, and the other end is supported by a first spring. The second end is biased in a direction away from the fixed pressure plate, and the other end is biased in a direction toward contact by a second spring.

[Function] Since the present invention is configured as described above, for example, the bottom cover is opened to funnel the film. Then, the movable screen frame is separated from the fixed pressure plate by the first spring. Therefore, the film is dropped between the movable screen frame and the fixed pressure plate. and close the bottom cover. Then, the second spring presses the movable screen frame against the fixed pressure plate, and the film is held at a predetermined position on the photographing surface.

By the way, according to the present invention, the movable screen frame is supported by a rotating shaft that can move in the direction of the fixed pressure plate, so the movement space for the movable screen frame is small, and the movable screen frame is evenly moved by the first and second springs. The film can be held with uniform pressure by being pressed against a fixed pressure plate.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a state in which the camera body 1 is turned upside down and the bottom M2 for film exchange is opened. When the bottom cover 2 is opened, the bottom of the camera body 1 has a cartridge chamber for storing the cartridge 4. 1b, a spool chamber 6 that accommodates the spool 5, and a groove 30 forming a film conveyance path from the cartridge chamber 1b to the spool chamber 6 are open, so that film can be dropped and loaded from the bottom side of the camera body, When the bottom cover 2 is closed, a film winding mechanism (not shown) is activated to perform autoloading.

The surface of the spool 5 is covered with a material having a large coefficient of friction, such as rubber 5a, and as shown in FIGS. 1 and 2, a spool lever 17 supports the vertical axis.
Supported by These spool levers 17 are configured to swing clockwise and counterclockwise about the rotating shaft 17b. On the other hand, in the subur chamber 6, there are a 10th la 7 and a 20th la 8 facing the spool 5.
These rollers are also roller supported! 1IIl
It is rotatably supported by a frame body that swings about 9.

The spool lever 17 is biased toward the rollers 7 and 8 by a spring (not shown), but its structure is not directly related to the present invention, so a description thereof will be omitted. When the bottom cover 2 is closed, the spool 5 is moved to the first and second positions as shown in FIG.
When the spool lever 17 is moved toward the 0-ra 7.8 side and the bottom cover is opened, the spool lever 17 is rotated counterclockwise, and the film guide plate 12, which will be described later, is rotated in a direction away from the spool 5.

The film guide plate 12 guides the film during film loading, and is formed into a curved shape concave toward the spool 5, as shown in FIG. It is dimensioned to be rotatable by a shaft 12b. A cam portion 12a is provided in a portion of the film guide plate 12 facing the spool 5. A pin 17a formed at the tip of the spool lever 17 is in contact with this cam portion 12a. When the spool lever swings, the bin 17a operates the cam part 12a, and the film kite plate 12 moves to the shaft +2b.
It will oscillate around. The film kite plate 12 is pushed toward the spool 5 by the temporary spring 12c (=J force).

The roller plate 14 has a 1.20-ra 7. It is arranged at a position opposite to the other side, and is supported by the main body 1 by a roller plate shaft 15. A spring load is applied to the spool side by this roller plate spring 16, and a third roller 13 that is in contact with the spool 5 is rotatably supported at its tip.

As shown in FIG. 2, FIG. 4, and FIG.
A fixed pressure plate 10 that is fixed to the main body and a movable screen frame 1 that moves and swings.
It is composed of 1. The film holding mechanism holds the film between them, and for this purpose, a fixed pressure plate 1 is used.
As shown in FIG. 2, the end facing the film 26 of 0 has inclined parts 10a, 10 that are convex toward the film.
b is forming. The fixed pressure plate 10 is formed into a plate shape from a material that does not easily damage the film base surface, such as plastic.

As shown in FIG. 4 and FIG. is formed, and the lower part is provided with an inclined part lid for guiding the film. The whole structure has a frame shape.

The movable screen frame 11 formed as described above is rotatably and swingably supported at its upper end portion by a rotation axis lie. In other words, this rotating shaft 11c is a rotating shaft 11c provided inside the O-shaped groove 1 formed in the main body 1.
and a stopper 1° C., which is formed on the main body 1 so as to be opposed to each other so as to protrude toward the rotating shaft 11c. Therefore, the movable screen frame 11 is movable around the rotating shaft 11c, and is also movable in the direction of force of the fixed pressure plate C1, which moves inside the rotary shaft 11c or into the O-shaped groove 1. be. A spring is also provided for the above-mentioned rocking or movement. That is, a bottle l1f1ρ is installed between one end of the movable screen frame 11 shown in the upper part of FIG. 4 and the main body, and a return spring lle is provided for the other bottle. . Since the return spring 11e is set in a compressed state, the movable screen frame] 1 is pressed, and the frame 11 swings with the stopper 1°C as a support, and is fixed when the bottom cover 2 is opened. Separate from the pressure plate 10. This state is shown in FIG.

A second push spring 29c for swinging the movable screen frame 11 is provided between the movable screen frame 11 and a rotary lever 29 rotatable by a rotary shaft 29b in the lower part of the main body. ing. This second C-shaped spring 29c is much weaker than the return spring lie. Therefore, when the rotary lever 29 is in a free state, that is, when the bottom M2 is open, the movable screen frame 11 is separated from the fixed pressure plate 10, as shown in FIG.

In the lower part of the main body 1, there is an operating part 29a of the rotary lever 29.
A push bottle 28 for pressing is provided so as to be freely retractable.

The push bottle 28 is released or pushed in by opening and closing the bottom cover 2.

In the cartridge chamber 1b, as shown in FIG. 6, the side wall 15 is cut out by a predetermined amount from the upper end and is formed diagonally. Further, a protrusion 1d for pressing the upper end 4a of the cartridge 4 is provided on two sides of the shooting amount 1 section 1a, and a spring member 31 for urging the cartridge 4 upward is provided below. ζ

A corrugated cartridge chambering member 25 for returning the cartridge 4 to its normal position is provided inside the bottom lid 2.

In the camera configured as described above, when the bottom cover 2 is first opened as shown in FIG. 2 when loading film, the cartridge chamber 1b, which is widened toward the bottom of the camera, is exposed, and the movable screen frame 11 is opened. is located at a distance from the fixed pressure plate 10 due to the forward bias of the return spring lie, so the camera user can move the film leader part from the cartridge 4 to a predetermined length, as shown in FIG. With the tip of the spool 5 sandwiched between the roller 7.8 and the outer circumferential surface of the spool 5 wound with rubber 5a, the cartridge 4 is pulled out from the bottom of the camera into the cartridge chamber 1b.
Insert the film leader into the movable screen frame 1.
1 and the fixed pressure plate 10, and further align the tip of the film leader part along the outer peripheral surface of the spool 5.

When the camera user closes the bottom cover 2, the cartridge holder 25 member on the bottom M2 first corrects the inclination of the cartridge 4 and makes it stand upright, allowing complete insertion of the film leader section. Second, the movable screen frame 11 is pushed into the push bin 28.
, rotate the rotation lever 29 and press the suspension spring 29c.
By this action, the film 26 is pressed against the fixed pressure plate 10 side and held on the photographing surface. At this time, even if the film is slightly shifted in the vertical direction, it is guided by the sloped portion 11d and completely dropped.

Thereafter, the spool 5 is also rotated clockwise from the position shown in FIG. 2 about the shaft +7b by a third spring (not shown), and the leading end of the film is sandwiched between the spool 5 and the roller 7.8, and the film is spooled onto the spool. Closely followed by 5. When the bottom cover 2 is further rotated in the closing direction, the film pressing force of the spool 5 on the roller 7.8 increases. As the spool lever 17 rotates, the bin 17a also rotates, and the film guide plate 12 rotates clockwise along this rotation. The roller plate 14 is also rotated by the roller plate spring 16, and together with the film guide plate 12, creates a substantially circumferential space around the outer periphery of the spool 5, thereby securing a passage for the film leader section.

When the bottom cover 2 is completely closed, the bottom cover opening/closing wing (not shown) locks the bottom cover 2, and the motor 19 driven by the battery 20 is energized by the generation of the bottom cover close signal from the bottom cover detection switch (not shown). Then, the spool 5 is rotated via the transmission gear train 27 to start feeding the film.

When idle feeding is started, the film is wound around the outer periphery of the spool 5 by rollers 7 and 8 within a range of about 45', so that sufficient feeding force is generated and the film is fed into the substantially circumferential space.

The film curls into the film guide plate 1.
2 and the roller plate 14, and is again pressed against the spool 5 by the roller 13, and the roller plate spring 16
The pushing force causes the leading end of the film to gain feeding force again, go around the spool 5, and then move between the second half of the leader section and the spool 5.
invades between. Then again, roller 7 and roller 8
Since the film is pressed against the film, its feeding force tightens the film and absorbs any slack in the film. At that time, the second half of the film is paused. After the winding is tightened, it is fed a predetermined amount and then stopped. These movements of the film are detected by a film advance detecting device (not shown), and blank advance and frame advance are performed.

When the blank feed is completed, the camera enters a shooting standby state. or,
As a method for ensuring film flatness in such a reverse winding camera, a portion of the film guide rail of the fixed pressure plate 10 and the movable screen frame 11 are both inclined in the winding direction of the spool. On the other hand, as for the method of holding the cartridge 4 of this type of camera, it is preferable to press it backwards from the relationship between the biasing direction of the DX contact piece 24 and the rearward pushing of the film.
At the same time, a slope 2b (FIG. 2) is provided to direct the film outlet of the cartridge slightly upward.

As described above, according to this embodiment, the movable screen frame 11 rotates with the 8 movements by the rotation shaft 11c, so the film can be held in a well-balanced manner by the action of both the return spring 11e and the pressing spring 29, and the movable screen By managing the dimensions of the slot provided in the frame, the screen of the tunnel can be managed.8 [Effect of the invention] As mentioned above, the book According to the invention, the movable screen frame can be moved from one end of the frame to the fixed pressure in the direction of contact with the fixed pressure by rotating the axis of rotation. , :
This movable screen frame is supported by the first axis. Second
j, which is in contact with the fixed pressure plate, is biased by the spring in one direction and away from the fixed pressure plate, so i1! This has the advantage that the interval between movements of the JJ frame is small, and the entire camera can be constructed in a compact manner. Furthermore, since the movable frame is supported by a movable rotating shaft, the film can be pressed with a fixed pressure in a well-balanced manner by the action of the first and second springs. Furthermore, according to the present invention, it can be constructed from two springs and one movable screen frame, and the film holding mechanism can be provided at a low cost.

4. [12] Explanatory drawings show an embodiment of the present invention. Figure 1 is a perspective view of the camera seen from the back side, and Figure 2 shows the state with the bottom cover open. −
' Cross-sectional view, Figure 3 is a horizontal cross-sectional view showing the closed state, Figure 4 is a vertical cross-sectional view in the optical axis direction with the bottom cover open, and Figure 5 is the optical axis direction in the closed state. The vertical sectional view, FIG. 6, is a sectional view taken along arrow A-A in FIG.

1a... Shooting amount Dδ15 2... Bottom cover 4... Patrone 5... Spool 10... Fixed pressure plate
11...Movable screen frame 1ie...Return spring (
1st spring) 11c...Rotation axis

Claims (1)

[Claims] 1. A fixed pressure plate provided facing the photographic lens,
It consists of a movable screen frame that cooperates with the fixed pressure plate to hold the film on the photographing surface, and the movable screen frame is movable in the direction of moving away from and into contact with the fixed pressure plate. It is pivotably supported by a rotating shaft, and one end thereof is biased in a direction away from the fixed pressure plate by a first spring, and the other end is biased in a direction in contact with the fixed pressure plate by a second spring. A film holding mechanism for drop-type film loading.