JPS60258528A - Camera with auto-loading device - Google Patents

Abstract

PURPOSE:To load and wind surely the front end part of a film around a take-up member to feed the film by making the pressing force to the take-up member of one pressing means larger than that of the other pressing means. CONSTITUTION:A pressing means 16 for film superposition which has the base part supported pivotally on a camera body by a shaft 15 in a take-up chamber 14 is energized in the direction of an arrow by a spring 17, and a roll 19 is an actual pressing member. A pressing means 21 for film reception which has the base part supported pivotally by a shaft 20 provided on a rear cover is energized in the direction of an arrow by a spring 22, and a roll 4 is an actual pressing member. Since energizing forces of springs 17 and 22 are so set that the pressing force of the pressing means 16 is larger than that of the pressing means 21, the front end of a front end narrow part A of the film wound around a take-up member 3 overcomes the pressing action of the pressing roll 4 and is inserted between the succeeding film part and the take-up member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic loading and winding device for a camera, and particularly to a winding member therefor.

In the automatic film loading device of a camera that uses Patrone 12, when the camera back cover is opened and a film cartridge is loaded, the leading edge of the film that comes out of the cartridge is placed on the sprocket, and the back cover is closed. Many of them are configured so that the film is automatically wound onto the spool when a normal film winding operation is performed. In this type of film, the perforation at the leading edge of the film is engaged with the pawl of the sprocket (in most cases, the tip is a narrow part, but in that case, the pawl on one side) is inserted into the film. In the winding operation, the film is fed to the spool by the rotation of the sprocket, and when the leading edge of the film comes into contact with the outer peripheral surface of the spool, the leading edge of the film is wound around the spool by some means.

There is a known means for winding the spool around the spool that engages the perforations with special claws provided on the spool, but it is difficult to avoid friction due to the simple structure and reliable operation. It is advantageous to use

In one example of this type of automatic loading device, as shown in FIG. It is bent along the same direction and guided around the spool 3, which is a winding member. In addition, the outer surface of the spool 3 is
A flat surface with no irregularities is preferred. Then, as will be described later, the film is pressed against the winding member 3 by a suppressing roller 4, 19, etc. provided at an appropriate position such as the back cover, and the film is brought into engagement with the winding member by frictional force. To explain in detail, the winding member 3 is made of a rigid material such as metal and has a lower part flange 5aQ as shown in the figure.
An inner cylinder 5 made into a sticky cylindrical shape, and an outer cylinder 6 and f closely attached to the outer periphery of the inner cylinder 5 are provided.

The outer diameter of the end 6a of the outer cylinder 6 near the flange 5a is larger than the outer diameter of the other part 6b (for example, the diameter difference is 0).
2 to 04). Specifically, in order to achieve this different shape, as shown in No. 211A, double-sided adhesive tape 7 is wrapped around the outer surface of one end of the inner tube 5, and the double-sided adhesive tape 7 is wrapped around the outer surface of the inner tube 5 and the double-sided adhesive tape 7. It is covered with a cylinder or outer cylinder 6 made of a high friction elastic material with a uniform thickness. Preferably large diameter end 6
The width B of & should be smaller than the distance from the side edge collar of the narrow end of the film to the far side of the bar foliation a.0 The winding member 3 should be It is rotationally driven by a DC motor M inserted concentrically. That is, a pinion 8 on the output shaft of the DC motor M meshes with a gear 10 on a shaft 9 rotatably installed in the camera body. A driving gear 11 loosely fitted onto the shaft 9 meshes with internal teeth 12 of the inner cylinder 5, and this driving gear 11 is loosely fitted onto the shaft 9.
The rotating torque is transmitted from the friction plate 13 of the rotating member 3, and the rotating member 3 is driven to rotate at a reduced speed. It goes without saying that the inner cylinder 5 and the outer shell structure of the motor M may be constructed integrally. The sprocket 1 and the winding member 3 are interlocked by an appropriate gear train means (not shown), and the rotation ratio depends on the circumferential speed of the sprocket 1 (film feeding speed) and the winding loss. It is desirable to set the ratio to the circumferential speed of the rotation member 3 (the amount of film winding in the first rotation) from 1:13 to 2.0.

Returning again to FIG. 1, there is a film stacking pressing means 16 located in the winding chamber 14 and having a base pivoted to the camera body by a shaft 15.
is biased in the direction of the arrow by a spring 17, and a metal shaft 18 is integrally cut out at the tip of the fCτ cola 1.
I support 9.

The roller 19 becomes an actual pressing member, and the inward direction of the plate i33 that supports the roller 19 at a rotation rate is the guide curved surface 16a. Note that the position of the roller 19 with respect to the film width is set so that it is located outside of both 111j and perforation positions Ftk of the film. In this case, the lower roller 19 is in contact with the large diameter portion of the winding member 3 and is theoretically in a state of partial contact with the winding member 3, but there is no problem in practice. In addition, the camera back (
A film receiving pressing means 21 whose base is pivotally supported on a shaft 20 installed in K (not shown) is biased in the direction of the arrow by a spring 22, and has a rotatable metal shaft 23 at its tip.
The above-mentioned suppression roller 4 is provided. In this case, in the absence of the film, only the pressing roller 4 comes into pressure contact with the outer peripheral surface of the winding member 3 and does not act as an actual pressing member, and the metal shaft 23 that holds the pressing roller 4 is rotatably supported at both ends. The inner surface 21a of the plate member is a curved guide surface for the narrow end portion A of the film. Therefore, sprocket 1
The narrow end portion A of the film fed by is forced by this guide curved surface 21a and guided to the outer peripheral surface of the unwinding member 3, and is then sandwiched between the outer peripheral surface and the pressing roller 4. . Then, the pressing roller 4 and the winding member 3.
! The contact point of : is set near the point where the leading edge of the film fed by the sprocket 1 first contacts the outer peripheral surface of the winding member 3 in a natural state, and the contact point is set near the point where the leading edge of the film fed by the sprocket 1 first contacts the outer circumferential surface of the winding member 3. The points of contact with the outer circumferential surface of the take-up member are the inner wall surface 2 of the take-up chamber 14, the guide curved surface 16 of the film overlapping suppressing means 16, and the tip of the film oriented in the opposite direction, which easily contacts the outer circumferential surface of the take-up member 3. It is desirable to set it in a position where it faces towards you. The forces of the respective springs 17 and 22 are set so that the pressing force of the film superimposing pressing means 16 is greater than the pressing force of the film receiving suppressing means 21.

Now, as shown in FIG. 2, the film winding chamber 14 is configured such that its inner wall surface 2 is aligned with the rotation axis of the winding member 3, and the outer circumferential surface of the winding member 3 and the pressing roller This is the position where the leading edge of the film leading end narrow part A which is sandwiched between the film leading end narrow part 4 and which advances in a curved trajectory first comes into contact with the inner wall surface 2 of the width chamber 14, and furthermore, the film leading end narrow part For example, six plate-shaped pieces 24 each having a thickness of about 1 degree are pasted at positions corresponding to positions near the notch side of A @A'.

The curved piece 24 may be made of any shape and material as long as it does not damage the leading edge of the film and the back surface of the film, and for example, a synthetic resin material such as Maltbren (trademark of Bayer Tsuji, Germany) may be used. Further, the thickness of the curved piece 24 is determined by the film tip narrow portion At.
- As shown in Fig. 2, the direction of movement of the narrow end portion A of the film against the inner wall surface of the rolled film is upward because the point of application of the tensile force by the sprocket 1 is close to the lower end of the film A. Prevent people from trying to swerve. The size of the curved piece 24 may be, for example, about 5 mm in width and about 10 to 15 mm in length.

Since the illustrated embodiment has the above-described configuration, the material is fed by the sprocket 1, is sandwiched between the outer circumferential surface of the winding member 3 and the pressing roller 4 of the receiving pressing means 21, and enters the winding chamber 14. The narrow end portion A of the film, which has entered in a curved trajectory, comes into contact with the curved piece 24 on its back surface, so that its surface is tilted as shown in FIG. When the circumferential edge of the film 3 is turned diagonally downward and reaches the overlapping suppressing means 16, its guide curve 165L guides the leading edge of the film tip narrow portion A to the outer circumferential surface of the winding sb member 3 again. , the narrow end portion of the film is sandwiched between the roller 19 and the outer peripheral surface. Then, the leading edge of the narrow end portion A of the film continues to advance while receiving a stronger pressing force from the roller 19, and the subsequent film, that is, the film stretched between the sprocket 1 and the winding member 3. It abuts against the inner surface of the portion (still a narrow portion) and is further guided by the inner surface of the cough film to reach a contact point between the pressing roller 4 of the receiving pressing means 21 and the outer peripheral surface of the winding member 3. In this case, piece 24
Due to the diagonal downward action of the film, there is no risk that the leading edge of the film will enter the perforation of the succeeding film section, and there is no risk of the film rolling up into a so-called box shape.

In addition, since the pressing force applied to the roller 19 of the film superimposition pressing means 16 is greater than the pressing force of the pressing roller 4 of the receiving pressing means 21, the narrow end portion A of the film that has gone around the winding member 3 is The leading edge is a part of the film that overcomes the pressing action of the pressing roller 4 and the subsequent film part and the winding member 3.
It will enter between.

Therefore, the circumferential speed of the winding member 3 is greater than the circumferential speed of the sprocket l, and the frictional force on the outer circumferential surface of the film winding member is greater than the frictional force between the film surfaces at the position of the receiving and suppressing roller 4. The advancing speed of the inner film portion (the leading edge of the narrow tip portion) that is in direct contact with the outer peripheral surface of the winding member 3 is higher than the speed at which the subsequent film portion located outside it is fed. is also larger, so
The narrow end portion A of the film circulating around the winding member 3 gradually comes into close contact with the outer peripheral surface of the winding member 3. In other words, the button becomes tightly wound. In this case, the winding member 3
Since the outer diameter of one end portion (for example, 1'1li from the end) is slightly larger than the outer diameter of the other portion 6b, the narrow end portion A of the film is normally As in the case of a medium-thick pulley, the end face of the thin end portion A of the wrapped film is securely placed on the flange 5a due to the presence of the flange 5a. It will be located. Therefore, the so-called ``sink phenomenon I'' can be completely avoided. In the illustrated embodiment, the position of the pressing roller 4 of the receiving pressing means 21 is set near the notch side edge of the narrow end portion A of the film (approximately in the center of the entire film); This is convenient for bringing the lower end portion of the narrow end portion A into contact with the support portion 68 without any force, and also helps the tilting effect of the curved piece 24 on the surface of the narrow end portion of the film to prevent the occurrence of the sagging phenomenon. It is also effective for hives. However, depending on the case, it is also possible to provide the pressing rollers 4 on both sides, for example, like the rollers 19 of the superimposing pressing means 16. .

Now, after the film leading end narrow part A is tightly wound around the film winding member 3, the film is regulated by the amount of rotation of the sprocket 1, and the film is regulated by the amount of rotation of the sprocket 1, so that the film is not unrolled. Piece by piece ++r 1st volume losing parts 30 evenings 1
It is wrapped around the circumference. At this time, sprocket 1 and Toga 1
The circumferential speed difference with the storage member 3 is corrected by the sliding action of the friction plate 13, but the surface pressure is changed by means of a pond (7 may also be used. In the illustrated embodiment, the sprocket is used to feed the film. J
However, when using a film without perforations, it is sufficient to use a friction roller means.Also, the narrow end of the film can be pulled out with fingers to the position of the pressing means for receiving the film, and then the back cover is closed. Even if the middle part of the leading edge is automatically wound simply by rotating the film winding member, if the automatic winding method with the camera back cover closed is not necessary, there is a possibility that the receiving pressure A means is provided on the camera body side, and with the back cover open, feed the leading edge of the film into the film winding member using your fingertips, and check that the narrow part of the film leading end has been wound around the film winding member. You can also close the back cover after doing so.

Needless to say, when winding the narrow end of the film on a motor-driven film winding member, it is necessary to wind the first few frames continuously. It is sufficient to provide an air feeding means.

Note that the curved piece 24 is not limited to an adhesive type, but may be formed integrally with the winding chamber, and may be made of a hard material such as metal. In addition, the inner wall surface 2 of the film winding chamber 14 does not necessarily have to be a surface that runs downward to the axis of the winding member 3, and depending on the case, it is also possible to use the curved piece 24 and tapering the inner wall surface together. It is.

It is clear that in order to ensure complete winding of the film, it is essential that the coefficient of friction between the film A and the surface of the winding member 3 be large.

In ordinary cameras, this winding member is made of metal or hard synthetic V14 resin, but the coefficient of friction of these materials is too small, making the operation unreliable.

In this invention, the surface material of the outer tube 6 of the winding member 3 is preferably an elastic material, and it has been experimentally discovered that the coefficient of friction of these materials should be 15 or more.

The inventor of this invention has discovered that natural rubber, urethane rubber, chloroglene rubber, ethylene vinyl acetate rubber,
Regarding various rubber materials such as silicone rubber and nitrile rubber, a reel with an outer diameter of 17 m and a width of 34 tm+ was actually installed in a camera, and the quality of film winding was tested.

As a result, it was found that reliable operation is possible if the friction coefficient is 15 or more, but it was not possible to obtain a material with a friction coefficient in this range due to the hardness of ethylene vinyl acetate rubber.

In selecting the material, consideration must be given to problems such as the size of the product and fogging on the film. From this point of view, silicone rubber has been found to be preferable for irons.In addition, in the case of winding parts used in movie projectors, etc., they are normally used at room temperature, and the influence of temperature is not very large. I can't say that. However, cameras are often used outdoors, and considering that they are used in regions ranging from the tropics to extremely cold regions, changes in hardness due to changes in the elastic material by m degrees, and the resulting changes in frictional resistance, are factors that cannot be ignored. becomes.

Figure 3 is a graph showing changes in the temperature-friction coefficient for silicone rubber (SR) (!: nitrile rubber (NBR) over a wide range of -30°C to 80°C). It shows a nearly constant coefficient of friction.

As a result of experiments, the hardness and friction coefficient of the materials that were determined to be suitable as surface materials for the winding member are shown below.

Silicone rubber A Same B Same C Hardness JIS Kf53 old) 51 54 59 Friction coefficient 1.75 1.75 2.00 (Friction coefficient is AST
(Measurement based on the standard of MD-1894) The measurement method of ASTM D1894 is as follows.

Vertical load: 100 to 250 g Traveling speed: 100 dragons/min Measuring method Measure the friction coefficient by attaching the material to a sled and sliding it on the film emulsion surface.The higher the friction coefficient of these rubbers, the more certain the effect will be. Needless to say, it is possible to manufacture materials with high friction coefficients that are unmeasurable for the material itself, but from a practical point of view when manufacturing spools, if the friction coefficient is large, rubber A friction coefficient of up to about 3.0 is sufficient because the material becomes soft, which reduces workability during assembly, reduces mechanical strength, and makes molding difficult.

As explained above, according to the present invention, in the automatic film loading device, by selecting the friction coefficient of the surface material of the winding member Q1 within an appropriate range, the leading end of the film fed by the sprocket can be securely engaged. By winding the film, it is possible to load and feed the film reliably, and if the material is specified, it can maintain its function and effect over a wide temperature range from -30°C to 80°C, and has a simple structure and easy operation. This made it possible to obtain a reliable automatic loading device.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the operation of automatic film loading using the winding member of the present invention, Fig. 2 is a sectional view of the main part of the automatic film loading device, and Fig. 3 is a diagram showing the coefficient of friction at a temperature of 1fK. This is a graph showing the change. The code in the diagram is 1: Sprocket.
2: Winding chamber wall surface 3: Winding member 4: Suppression roller
8: Binion 11: Drive gear 13: Friction plate 14: Winding chamber 16: Film superposition suppressing means 19: Roller 2
1: Pushing means for receiving film 24: Six plate-shaped pieces are shown, respectively. Patent applicant Konishi Roku Photo Industry Co., Ltd. Representative Patent attorney Fumi Sato (and 1 other person) Figure 1 9 ■ Figure 2 Figure 3 Temperature j change ℃

Claims (1)

[Claims] It includes a film winding member having a silicone rubber surface and two film pressing means biased to press the film to be wound against the winding member, the core pressing means having a support member and the supporting member. It consists of a roller provided on the member,
The leading edge of the film is directed between the following film and the other suppressing means by one of the suppressing means, and the pressing force of the one suppressing means against the winding member is applied to the winding member of the other suppressing means. A camera having an automatic loading device characterized in that the pressing force is greater than the pressing force against the No. 41 member.