JPS62161134A - Automatic film winding camera - Google Patents

Abstract

PURPOSE:To wind a film securely by energizing and providing the 1st rotatable roller at a position corresponding to the notched edge side part of the narrow leader part of the film in use and also energizing and providing the 2nd rotatable roller at a downstream position of the 1st rotatable roller in the moving direction of the film. CONSTITUTION:The film is fed by a sprocket 4 and applied with a downward force while being inserted between the outer peripheral surface of a film take-up member 9 and the rubber roller 29 of a pressing means 11 for reception. Thus, the narrow leader part A of the film which enters a take-up chamber 8 while drawing a curve has its back brought into contact with a projected piece 25 and then rotate slantingly downward around a film take-up member 9 to reach a pressing means for superposition. The tip of the narrow leader part A of the film which is made free once is led to the outer peripheral surface of the film take-up member 9 again through a guide surface 10a and then inserted between a film roller 24 and the outer peripheral surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic film winding camera, and more particularly to an automatic film winding camera in which the leading edge of the film is wound around a spool using only frictional force.

In this type of automatic winding camera, when the camera back cover is opened and a film cartridge is loaded, the leading edge of the film that is slightly protruding from the cartridge (in many cases, it is also the narrow part of the leading edge) is placed on the sprocket. There are some devices that allow you to wind the film onto the spool by closing the back cover and performing the normal film winding operation. (Japanese Patent Publication No. 44-3645, Japanese Utility Model Publication No. 42-3491) However, for example, the configuration disclosed in Japanese Patent Publication No. 44-3645 disposes a large number of contact members in the circumferential direction of the spool. However, the structure is unavoidably complicated, and it is difficult to equalize the contact force of each contact member against the spool in the width direction. There is a danger that it will not be possible.

Furthermore, the configuration disclosed in Japanese Utility Model Publication No. 42-3491 requires a mechanism for displacing the position of the spool, and also requires at least four rollers in the circumferential direction of the spool, which also requires the above-mentioned structure. complication and the risk of the film being conveyed crooked.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic film winding camera that can eliminate inconveniences known as loose winding phenomenon or winding phenomenon that tend to occur during film transport (winding) with a simple structure, and can perform reliable winding. It's about doing.

Specifically, rotatable rollers for pressing the film are arranged at two locations around the spool, and the position of the first rotatable roller that first presses the film onto the spool is set at the narrow end of the film to be used. A configuration in which a second rotatable roller is biased and provided at a position corresponding to a portion on the edge side of the notch, and a second rotatable roller is biased and provided at a position downstream of the first rotatable roller when viewed in the film traveling direction. It is characterized by

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

Figure 1 shows an auto-loading 35m vehicle to which the present invention has been applied.
1 is a cross-sectional view of an M camera, in which reference numeral 1 indicates a photographic lens, 2 indicates a camera body, 3 indicates a back cover that can be opened to one side by means of a screw 3a provided at the right end, and 4 indicates a sprocket. The narrow end portion A (see Fig. 2) of the film wound on the film cartridge accommodated in the cartridge chamber 5 is passed through the space between the exposure window 6 and the pressure plate 7 by a sprocket 4 at a constant length. The film is fed into the winding chamber 8, and this winding chamber 8
The film is wound up by an automatic film winding device located inside.

The automatic film winding device includes a cylindrical film winding member 9 that is rotatably supported by a camera body 2, and a film winding member 9 that presses a narrow end portion A of the film against the circumferential surface of the film winding member 9. It includes two pressing means 10 and 11 that are spaced apart from each other in the circumferential direction.

As shown in FIG. 2, the film winding member 9 includes an inner cylinder 12 made of a rigid material such as metal and having a cylindrical shape with a flange 12a, and a hardness of 40 mm that is tightly attached to the outer periphery of the inner cylinder 12. It is provided with an outer cylinder 13 made of a high friction elastic material such as neoprene or butadiene rubber with a temperature of about 50 degrees.

An end 13 of this outer cylinder 13 closer to the flange 12a
The outer diameter of a is set to be larger than the outer diameter of the other portion 13b (for example, a diameter difference of about 0.2 to 0.4 mm). This makes it more advantageous for the side edge of the narrow end of the film to move along a straight trajectory (hereinafter referred to as an ideal straight trajectory) determined by the position of the rail near the exposure window 6 and the position of the sprocket throat claw. . It is preferable that the intermediate amount B of the large diameter end 13a be smaller than the distance from the side edge of the narrow end portion of the film to the far side of the corresponding perforation a.

The film winding member 9 is rotationally driven by a DC motor 14 inserted concentrically into the inner cylinder 12. That is,
A pinion 15 on the output shaft of the DC motor 14 is meshed with a gear on a shaft 16 rotatably installed in the camera body 2 . and a drive gear 18 loosely fitted on the shaft 16.
is meshed with the internal teeth 19 of the inner cylinder 12, and the drive gear 18 of the bracket receives rotational torque from the friction plate 20 of the shaft 16, so that the film winding member 9 is driven to rotate at a reduced speed. be done. It goes without saying that the inner cylinder 12 and the outer shell structure of the motor 14 may be integrally constructed. Regarding the relationship between the sprocket 4 and the film removing member 9, they are interlocked by an appropriate gear train means (not shown), and the rotation ratio is determined by the circumferential speed of the sprocket 4 (film feed amount) and the film winding amount. The ratio of the circumferential speed of the take-up member 9 (film winding amount in the first round) is 1:1.
．． It is desirable to set it to between 3 and 2.0.

On the other hand, as shown in FIG. 3, the film stacking pressing means 10, which is located in the winding chamber 8 and whose base is pivoted to the camera body 2 by a shaft 21, is actuated in the direction of the arrow by a spring 22 (second biasing means). The roller 24 (second rotatable roller), which is cut out integrally with a metal shaft 23, is attached to the tip bent outward (in the direction away from the film winding member). )
is supported. The roller 24 becomes an actual pressing member, and the inner surface of a plate member that rotatably supports the roller 24 serves as a guide curved surface 10a. The position of the roller 24 with respect to the film width is desirably set so as to be located outward from the perforation positions on both sides of the film. In this embodiment, the lower roller 24 is located at the large diameter portion of the film winding member 90, and theoretically it is in a state of uneven contact with the winding member 9, but this is not a problem in practice. do not have. Further, the film receiving pressing means 11 whose base is pivotally supported by a shaft 26 installed on the back M3 is biased in the direction of the arrow by a spring 27 (first biasing means), and has a rotatable tip. A rubber roller 29 (first rotatable roller) supported on a metal shaft 28 is provided. The roller 29 is positioned so that it can press a portion near the edge of the notch in the narrow end of the film when the back cover is closed. This is to apply a downward force to the leading edge of the film. The inner surface 11a of the plate member rotatably supporting the metal shaft 28 that holds the roller 29 at both ends thereof serves as a guide curved surface for the narrow end portion A of the film.

Therefore, the narrow end portion A of the film fed by the sprocket 4 is forced by the guide curved surface 11a and guided to the outer peripheral surface of the film winding member 9, and is then sandwiched between the outer peripheral surface and the rubber roller 29. Become. Further, the contact point between the rubber roller 29 and the film winding member 9 in the latter circumferential direction is near the point where the leading end of the film fed by the sprocket 4 first contacts the outer circumferential surface of the film winding member 9 in a natural state. It is set to . On the other hand, the point of contact between the roller 24 of the film stacking pressing means 10 and the outer circumferential surface of the film removing member is that the leading edge of the film is oriented by the inner wall surface of the winding chamber 8 and the guide curved surface 10a of the film stacking pressing means 10. It is desirable to set the position so as to face the outer circumferential surface of the film winding member 9 without any difficulty.

In addition, so that the pressing force of the film superimposing pressing means 10 is greater than the pressing force of the film receiving pressing means 11,
The force of each spring 22 and 27 is set.

25 is the position where the leading edge of the narrow portion of the leading edge of the film that advances in a curved trajectory first comes into contact with the inner wall surface of the winding chamber 8, and is also the position of the notch side edge A' to the 11th most part of the leading edge of the film. For example, a thickness of 1 is pasted on the inner wall surface corresponding to a nearby position.
It is a plate-shaped mouthpiece about mm in size. The five pieces are not particularly necessary when the first rotatable roller 29 is provided at the position described above, but otherwise they are effective for advancing the film on the ideal linear trajectory.

Since the illustrated embodiment has the above-described configuration, the film is fed by the sprocket 4 and is sandwiched between the outer peripheral surface of the film winding member 9 and the rubber roller 29 of the receiving pressing means 11 to apply a downward force. The narrow end portion A of the film that has entered the winding chamber 8 in a curved manner has its back side aligned with the five pieces 25.
By coming into contact with this, it rotates around the film winding member 9 in a diagonally downward direction and reaches the superimposing pressing means. Once free, the leading edge of the narrow end portion A of the film is guided again to the outer circumferential surface of the film winding member 9 via the guide surface 10a, and is then sandwiched between the film roller 24 and the outer circumferential surface. Then, the leading edge of the film continues to advance while receiving a stronger pressing force from the roller 24, and the subsequent film, that is, the film stretched between the sprocket 4 and the film removing member 9. The film hits the inner surface of the film, and is further guided by the inner surface of the film, and reaches the point of contact between the rubber roller 29 of the receiving pressing means 11 and the outer peripheral surface of the member.

facing the film winding member 90 peripheral speed is sprocket 4
The inner side is in direct contact with the outer circumferential surface of the film winding member, and the friction generating force on the outer circumferential surface of the film taking member is greater than the friction generating force between the film surfaces at the receiving rubber roller 29 position. The film part of (
The advancing speed of the leading edge portion (the leading edge of the leading edge) is greater than the advancing speed of the subsequent film portion located outside, and therefore the leading edge width of the film winding member 9. A gradually comes into close contact with the outer peripheral surface of the winding member 9. In other words, it becomes a tightly wound state. As mentioned above, the position of the rubber roller 29 of the receiving pressing means 11 is set near the notch side edge of the film's leading edge narrow part A (approximately in the center of the gold mine of the film), while the film follows an ideal straight trajectory. Whether the film advances or not is determined by the initial pressing state of the pressing means, and the present invention achieves extremely good transport (winding) compared to placing the roller 29 at the lower end of the leading edge of the film. Furthermore, the large diameter portion 13a and the
Since the piece 25 promotes the action of tilting the surface of the narrow portion at the leading end of the film, the occurrence of the sagging phenomenon is doubly or triple-prevented. But that doesn't mean you have to do it.

Now, after the narrow end portion A of the film is tightly wound around the film winding member 9, the film is not regulated by the amount of rotation of the sprocket 4, as in the case of normal film winding, and so the film is rotated one frame at a time. The film is wound around the outer periphery of the film winding member 9.

At this time, the difference in circumferential speed between the sprocket 4 and the film winding member 9 is corrected by the sliding action of the friction plate 20. The receiving pressing means can also be provided on the camera body side.

Needless to say, when winding the narrow end portion of the film around a film winding member by driving a motor, a so-called multi-frame skip feeding means that can continuously wind up the first few frames is used. It should be installed together.

As described above, when the present invention is used, the effect of winding the narrow end portion of the film around the film winding member is extremely accurate.

Furthermore, since the second rotatable rollers are disposed at least at two locations in the longitudinal direction of the winding member with the first rotatable roller in between, film transport is stabilized.

The present invention can also be applied to an automatic winding device in which the narrow end portion of the film is located above the camera in the figure; in this case, the ideal linear trajectory is located above. In addition, when the pressing means for accepting the film is provided on the camera body side, the rotating shaft of the rubber roller is placed directly in the middle between the pivot shaft and the free end of the plate member, and the guide curve is moved free from that point. It may also be provided between the ends.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a 35 mm camera according to the present invention, FIG. 2 is an enlarged sectional view of the main parts of the same camera, and FIG. 3 is an exploded perspective view of an automatic film winding device. 2 is the camera body 3 is the camera back cover 4 is the sprocket 8 is the film winding chamber 9 is the film winding member 10 is the film stacking pressing means 11 for receiving the film 12 is the inner cylinder pressing means 13 is the outer cylinder A is the leading edge of the film The narrow width part 14 is the tape applicant: Konishiroku Photo Industry Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In an automatic film winding camera, the first rotatable roller is first biased to bring the notch edge side portion of the narrow end portion of the film used into contact with the film winding member. In addition to being biased by means and provided on the back cover side,
A second rotatable roller is disposed downstream of the position of the rotatable roller when viewed in the film traveling direction, and the second rotatable roller is pressed against the film winding member by a second urging means. Automatic film winding camera. 2. The second rotatable roller has a fulcrum at one end and is provided on the free end side of the support member biased by the second biasing means, and the second rotatable roller 2. The automatic film winding camera according to claim 1, further comprising rollers each located outside of said first rotatable roller with respect to said first rotatable roller. 3. The second rotatable roller is provided on a shaft rotatably held at a portion where both ends of the free end side of the supporting member are bent toward the side opposite to the film running side. 2
Automatic film winding camera as described in section.