JPH03175434A - Film driving device - Google Patents

Abstract

PURPOSE:To surely feed a film without generating a bounding phenomenon by surely positioning the part of a film surface where a sprocket tooth abuts on within a perforation from a perpendicular on a film reverse feeding direction side even when the sprocket tooth is in either positional relation. CONSTITUTION:A position where a sprocket for driving a film is integrated in a camera is made to coincide with the intersection point Q of the perpendicular l on the film surface passing the rotating center of the sprocket under a state that the rotating locus of the sprocket tooth 13a abuts on the film surface or the leading edge of the feeding direction of the perforation is positioned on the feeding direction side of the film from it. Then, the trailing edge of the feeding direction of the perforation is made to coincide with the intersection point on the barrel-like part side of a cartridge among the intersection points with the rotating locus R of the film surface and the sprocket tooth 13a under a state that two adjacent sprocket teeth 13a and 13a coincide with the film surface of positioned on the barrel-like part side of the cartridge from it. Thus, the bounding phenomenon of the sprocket is not generated and the film is surely fed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention rotates a film drive sprocket that can advance and retreat with respect to the film surface by meshing with perforations formed along the direction of the film running force. In particular, the present invention relates to a film drive device for driving a film to travel.

[Conventional technology]

A film cartridge consisting of a cylindrical part that stores photographic IM shadow film in a rolled state, and a film feeding part that extends on one side in the tangential direction of the cylindrical part and stores the leading end of the film in a straight line; The film adjusting mechanism and the like have been known from, for example, Japanese Utility Model Application Publication No. 58-67329. According to such a film cartridge structure, when loading the film into the camera or winding it up and taking it out after shooting, the leading edge of the film is retracted into the cartridge, making it easy for the operator to handle. It has the following advantages.

Hereinafter, a film cartridge 1 having the advantages described above and a film drive device 11 in a camera 10 loaded with the film cartridge 1 will be described.
An example (not publicly known) developed by the present inventors as
will be briefly explained using FIGS. 4 and 5. First, the film cartridge 1 consists of a cylindrical part 4 that stores the roll film 2 wound around a spool shaft 3, and a part of the cylindrical part 4 that extends from a part of the cylindrical part 4 to one side in the tangential direction and extends toward the leading end of the film. It has an external appearance that is integrally formed with a film feeding section 5 that stores the film in a straight line.

As shown in Figure 5, film 2 is as follows:
Five of them are built into the cartridge 1 with their tips facing the film delivery port 5a which is open to the extended end side of the delivery section 5. i! at some pitches in the feed direction! ! ! Perforations 2a, 2b, . . . are formed throughout.

In addition, in the lower @ part near the tip of this film 2, there is a related IE.
66 is bored, and this locking hole 6 is provided with a locking hole 6 that is integrally provided on the lower side of the leaf spring 7 which is fixed at one end side and lowered in the delivery portion 5 of the cartridge l. The piece 7a is engaged, thereby positioning and fixing the leading end of the film 2 within the cartridge 1, thereby normally restraining the movement of the film 2 within the cartridge 1 and preventing it from moving inadvertently. It has become. This locking piece 7a is caused by the movement of the leaf spring 7, so that it can move forward and backward with respect to the locking hole 6 of the film 2, and when this cartridge 1 is loaded into the cartridge loading chamber 12 on the camera 10 side, the camera 10 side presses the lower end 7b of the leaf spring 7 through the engagement hole 5b which is opened at a position lower than the edge of the film 2'F on the lower end side of the feeding section 5. Person in charge
The E piece 7a is pulled out from the locking hole 6 so that the film 2 can be transferred.

Further, an opening 9 is formed at one end of the inner surface of the film feeding section 5, as shown in FIG. The film is driven through the opening 9 on the camera 10 side, which will be described later. A film drive sprocket 13 constituting the device 11 is configured to engage and mesh with the perforation 2a during loading of the hatron to feed the film.

That is, as shown in FIG. 4, the camera 10 comes into contact with the loading chamber 12 into which the cartridge 1 is loaded, and the inner surface of the feeding section 5 of the cartridge 1 loaded into the loading chamber 12. The receiver that defines the loading position is the surface member 14.
The back part 12a of the loading chamber 12 and the receiver are used to feed the film in the cartridge 1 loaded with the protruding end part 4a of the cylindrical part 4 and the inner surface of the feeding part 5 in contact with each other by the surface member 14. A film early motion device including a sprocket 13 that engages and meshes with the perforation 2a through the opening 9, and a swinging lever part 15 using a well-known planetary gear mechanism that moves the sprocket 13 toward the film surface. 2111, and a back ri 16 for opening and closing the cartridge loading chamber 12. Here, the swinging lever portion 15 includes a sun gear 17 that rotates around a fixed axis on the camera 10 side, a lever arm 15a attached to the sun gear 17 by giving it an itching property by an itching spring 17a, and this A planetary gear 18 that is rotatably supported on the tip side of the lever arm 15a via a shaft 18a and meshes with the sun gear 17, and a circular arc yt that restricts the movement of the shaft 18a of this MJA gear 18.
It is constituted by a regulating plate 19 having a diameter of 1 9 a. The sun gear 17 also includes reduction gears 20, 21 .
It is connected to an electric motor 23 via a pinion 22. Further, the planetary gear 18 is connected to the sprocket 13 by a cylindrical shaft 18b, so that these rotate together as one unit.

According to such a film loading device 111, by loading the cartridge 1 into the loading chamber 12 of the camera 10, positioning it in a predetermined state, and closing the cartridge cover 16, the film 2 is loaded by the aforementioned presser 8. The restraint state within the patrone I is released, and it becomes possible to be transported. In this state, the motor 23 is driven to rotate in the direction of arrow a in FIG. direction, and is moved within the arcuate groove 19a of the regulating plate 19 to a position where it comes into contact with the front end side in the figure.

As a result, the sprocket 13 moves from the retracted position to the advanced position with respect to the film 2 in the cartridge 1,
One of the sprockets 13a of this sprocket 13 passes through the opening 9 to the perforation 2a,
2b, . . ., the film 2 is driven to travel in the feeding direction, and it becomes possible to sequentially release the film 2 from the cartridge 1. The engagement state of this sprocket 13 with the perforations 2a, 2b, . . . on the film 2 side is
In this state, the sprocket 13 rotates in the same direction through the planetary gear 18, which is rotated in the direction indicated by the arrow d in FIG. The frames are played sequentially. In addition, 24 in FIG. 6 is the feeding section 5 of the cartridge I.
This is an escape groove for the sprocket (y) of the sprocket (13) formed on the inner wall that forms the film running path inside (south 13a).

After the photographing is completed, the motor 23 is rotated in the opposite direction (broken line arrow e in FIG. 4), and the sun gear 17 is rotated accordingly.
rotates in the direction of arrow f, and moves the shaft 18a in the arcuate groove 19a of the regulating plate 19 until it abuts against the rear end side as shown by the arrow g, and as a result, the sprocket) 13 moves to a position where it is retracted from the film 2. do. At the same time, the spool shaft 3 is rotated by a rewinding mechanism (not shown), and the film 2 is rewound into the cartridge 1.

[Problem to be solved by the invention]

By the way, according to the film moving device Htt having the above-described configuration, when the film 2 starts to break in, the rotation of the motor 23 causes the swinging lever part 15 to move the sprocket 13 close to the film surface side, thereby moving the sprocket 1i13a. When engaging one sprocket with the first perforation 2a on the film 2 side and engaging it, the sprocket f4i13a
The position of the sprocket 13 and the position of the first perforation 2a may be in various positional relationships from time to time. The film 2 may not be able to run and be driven by the film 2 due to the film being bounced back.

This rebound phenomenon is transferred to the sprocket 13 on the film surface.
The state of movement will be explained using FIGS. 7(a) and 9(b) to FIGS. 9(a) and 9(b), which are viewed from the plane. That is, FIG. 7(a) shows a state in which the sprocket 13 is in a retracted position from the film 2, and from this state the motor 23
When the sun gear 17 starts to rotate, the rotation of the sun gear 17 is initially transmitted only to the lever arm 15a side, which is caused to swing around the rotation center 0 of the sun gear 17, and is integrated with the planetary gear 18 at its tip side. The sprocket 13 is brought close to the film 2 side, and one of the sprocket teeth 13a comes into contact with the film 2 as shown in FIG. 7(b), for example. During this period, the IIJ1 rotation of the sun gear 17 directly becomes the rotation of the lever arm 15a, and the 'Ii star gear 18 and sprocket 13 do not rotate relative to the lever arm 15a, but are integrally rotated with the lever arm 15a. 17 rotation center 0
It just swings around. And sprocket l
The reason why one of the 1113a contacts the film 2 and causes a rebound phenomenon is due to the phase relationship shown in Figure 7(b). A perforation 2a facing the film at a certain distance on the opposite side of the film 2 in the feeding direction,
This is a case where the tip of one sprocket IM13a comes into S contact with a portion other than sprocket 2b.

To explain this in detail, when the sun gear 17 continues to rotate further from the state shown in FIG. 7(b), this sprocket 13
The force acting on the planetary gear 18 integral with this is the 8th
The result is as shown in Figure (a). That is, the force Fl that the planetary gear 17 receives from the sun float 17 meshing with it is the force Fl, and as the sun gear 17 rotates, the lever arm 15a # is moved by the action of the friction spring 17a. Shaft 18a of planetary gear 18 (sprocket 13
The force received from the rotation center P) is the force F2, and the reaction force that the tip of the sprocket tooth 13a of the sprocket 13 receives from the film 2 is the force F3. FIG. 8(b) shows how these three forces act on the lever arm 15a, and the direction of the resultant force causes the lever ll1ii 15a to move in the direction of arrow C in the figure. It is determined whether it is displaced in the direction of arrow g (toward the film surface) or in the direction of arrow g in the figure (towards the return to the retracted position). In this case, if the distance of the tip of the sprocket 13a that contacts the film surface from the +% line is large to some extent, the resultant force of the forces Fl-F3 will further displace the lever arm 15a in the direction of arrow C. The seventh
When the sun gear 17 is further rotated from the state shown in FIG.
The rotation of the film 2 also begins, and the film 2 is partially pressed and deformed as shown in FIG. 9(a). and,
Along with this, the direction and magnitude of the reaction force F3 from the film 2 change, and at a certain point the resultant force of Fl-F3 will act to push the lever arm 15a back in the direction of arrow g, and the lever arm 15a will be pushed back in the direction of arrow g. Arm 15a is thrown back.

With this momentum, the sprocket 13
moves away from the film surface, and then returns to the arrow C from that position.
will be moved in the direction of However, if the phase of sprocket *13a at this time is in the same state as shown in FIG. The problem of not being able to engage and obtain a meshed state cannot be avoided.

The present inventors brought the sprocket 13 close to the film surface as described above to form perforations 2a, 2b, .
Sprocket @13a whose positional relationship to the film surface cannot be specified when engaging and engaging with...
As a result of various studies on the relationship between the perforations 2a, 2b,... It has been found that this occurs when one of the sprocket teeth 13a comes into contact with the nonai film surface of the perforations 2a, 2b, . . . at a certain distance in the direction.

As a countermeasure to prevent such rebound phenomenon, the initial position of the first perforation 2a and its length in the film feeding direction may be set appropriately, or the initial position of the sprocket tooth 13a of the sprocket 13 may be set appropriately. It is conceivable to set it appropriately. However, in the latter case, the sprocket 13 is ij! A complicated mechanism is required in which the film is positioned and held in a predetermined state at the avoided position, and then brought close to the film surface side and engaged.

Therefore, by developing the former idea and reliably eliminating the above-mentioned rebound phenomenon, no matter what positional relationship the sprocket teeth 13a of the sprocket 71-13 are in,
The purpose is to securely engage the first perforation 2a of the film 2 and make an advance payment.

[Step F to solve the problem]

In order to meet such demands, the film drive device related to the unreleased (!l! I decided on the installation position on the camera side as shown below.

That is, referring to FIGS. 1 and 2, when the rotation locus of the sprocket * l 3 a is in contact with the film surface (FIG. 1), a line perpendicular to the film surface passing through the rotation center of the sprocket The leading edge of the perforation in the feeding direction is located on the film feeding direction side that coincides with the intersection point Q on the film surface of , 13a coincides with the film plane r! Among the intersections between the film surface and the rotation locus R of sprocket li13a in 4 (Fig. 2), the intersection point is set to coincide with the intersection on the side of the cylindrical part of the cartridge, or to be located closer to the oily part of the cartridge. It is.

[Effect]

According to the present invention, when a film cartridge is loaded into a camera and the sprocket is brought close to and engaged with the perforation on the leading edge side of the film exposed through the opening in the film feed section, when approaching the film surface. Regardless of the positional relationship of the sprocket teeth, the part where the sprocket teeth contact the film surface will always fall within the perforation on the side opposite to the film feed direction from the perpendicular line, ensuring proper and reliable sprocket and perforation. This allows the film to be transported reliably without causing any rebound or moxibustion.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

1 and 2 show an embodiment of a film drive device according to the present invention.

Parts that are the same as or correspond to those shown in FIG.

Now, according to the present invention, in the camera lO in which the film cartridge 1 shown in FIGS. The mounting position of the film drive sprocket (13) which meshes with the perforations 2a, 2b, . . . on the camera 10 side is set as follows. That is, sprocket fM13a
The sprocket in the state shown in Figure 1, where the rotational locus of the sprocket (13) is in contact with the film surface, coincides with the intersection point Q on the film surface of a line perpendicular to the film surface passing through the rotation center P of 13, or is closer to the film feed direction than that. (The leading edge of the perforation 2a in the feeding direction is located on the right side in Figure 1, and the trailing edge of the perforation 2a in the feeding direction is located on the two adjacent sprockets.) The tooth tips of 13a and 13a are aligned with the film surface. Of the intersections between the film surface and the rotation locus R of the sprocket teeth 2a in the state shown in FIG. The position of the sprocket 13 is set so that it is located on the direction side (left side in FIG. 2).

In other words, among various initial positions where the sprocket tooth 13a approaches the film surface and the sprocket tooth 13a contacts the film surface, the position where the sprocket tooth 13a contacts the film surface is the rotation center P of the sprocket 13. As shown in FIG. 1, the state in which the sprocket 11
In a state where the rotation locus R of 3a is in contact with the film surface,
This is when it coincides with the intersection Q. In such a case, the sprocket teeth 13a are aligned with the first perforation 2.
As for the groove that meshes with a, this perforation 2
It is necessary to set the leading edge of a in the film feeding direction to coincide with the intersection Q of the perpendicular lines or to be located on the film feeding direction side.

Further, as shown in FIG. 2, the state in which the tips of the sprocket teeth 13a are in contact with the opposite point of the film 2 from the intersection point Q on the film plane even if it is the farthest away is the state in which the tips of the sprocket teeth 13a are in contact with the two sprockets 113a of the sprocket 13, as shown in FIG. , 13a are aligned with the film surface, and in order for the sprocket 113a on the opposite side of the feed direction to mesh with this perforation 2a, the trailing edge of this perforation 2a in the falling direction must be aligned with the film surface. Surface and sprocket Sho 13
It may be set to coincide with or be located closer to the cartridge cylindrical portion 4 side (on the side opposite to the feeding direction of the film 2) among the intersection points of a and the rotation locus R. Needed.

In order to satisfy these conditions, when loading the filter cartridge 1, the position where the sprocket 13 contacts the film surface when starting film drive is adjusted to be different from the leading edge of the perforation 2a in the feed direction l111. It is preferable to position it in relation to the edge and install it on the camera 10 side.

In addition, the sprocket 1
Depending on the dimensions of the sprocket teeth 13a, the length Ll in the film feeding direction of the first perforation 2a that the sprocket teeth 13a engage with may be determined. Note that the length L2 in the film feeding direction of the perforations after the second perforation 2b does not necessarily have to match Ll of the first perforation 2a.
It can be set independently from the range L1 in which there is no problem in meshing with the sprocket 13. In this case, all perforations 2a and 2b including the first perforation 2a
, . . . at least the leading edges in the feeding direction must be formed at equal pitches.

According to such a configuration, the film 2 is loaded into the camera 10 and the film 2 is misted through the opening 9 in the film feeding section 5.
When approaching and engaging the sprocket 13 with the perforation 2a of the tip (111), no matter which positional relationship the sprocket 1i13a is in when approaching the film surface, the sprocket 13 and the perforations 2a, 2b, By increasing the meshing state with 1], film can be reliably fed without causing a rebound phenomenon.

2 In this embodiment, the first perforation 2 is formed from the leading end of the film 2 as indicated by L3 in FIG.
Although the case where the length up to a is increased is shown, in the case where the length at the leading end side of this film 2 is short, the first perforation controller 2a (7) The trailing edge in the film feeding direction and the sprocket 13 The positional relationship is shown in FIG. That is, in the embodiment shown in FIG. 1, FIG. 2, and FIG. However, as shown in Fig. 3, if we consider the case where the length of the film 2 at the tip side is as short as L4, in this case, the tip of the sprocket, )ml3a, touches the film surface. The position closest to the opposite feed direction than the intersection point Q with the above-mentioned line is a position further toward the opposite feed direction than the case shown in FIG. If the trailing edge is set to correspond to the intersection of the rotation 41AH of the sprocket tooth 13a with the film surface, as in the embodiment described above, the length L1 of the remover foration 2a in the feeding direction will be lower than in the embodiment described above. The length L5 between the film 2 and the second perforation 2b becomes longer, and the length L5 between it and the second perforation 2b becomes shorter. Therefore, considering the strength in this part, the quality of the front end side of the film 2 up to the first perforation 2a described above is It is better to make it long like L3.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape and structure of each part of the camera 10, including the structure of the film drive device 11 that moves the subblock 13 forward and backward toward the film surface, can be modified as appropriate. It is free to change, and various modifications are possible.

〔Effect of the invention〕

As explained above, according to the film drive device according to the present invention, the installation position of the film coarse movement sprocket that meshes with the perforation exposed through the opening of the film feeding section when loading the film cartridge is determined by the rotational trajectory of the sprocket i. so that the leading edge of the perforation reed in the feeding direction is located at or on the film feeding direction side of the intersection of the line passing through the sprocket rotation center and the film surface when the sprocket is in contact with the film surface.
In addition, the rear end edge of this perforation in the feed direction is located on the side of the cylindrical cartridge part of the intersection between the film surface and the rotation locus of the sprocket teeth in a state where the tips of the south teeth of two adjacent streak locations 2 coincide with the film surface. Although the configuration is simple, the rotation center of the sprocket (, The tip of the sprocket tooth will no longer come into contact with the non-perforated film surface on the opposite side of the film feed direction than the perpendicular line that passes through, and the sprocket rebound phenomenon will not occur, regardless of the rotational position of the sprocket tooth. , the sprocket can be appropriately and reliably engaged with the perforations on the film side, and the film can be driven to run reliably, which has various excellent effects.

[Brief explanation of drawings]

1 and 2 are schematic explanatory views for explaining the setting position of the sprocket with respect to the first perforation of the film, showing an embodiment of the film drive device according to the present invention, and FIG. 4 is an exploded perspective view illustrating a schematic configuration of a film drive device incorporated in a camera; FIG. 5 is a perspective view illustrating a schematic configuration of a film cartridge; FIG. 6 is a diagram illustrating a modified example. 7 is a schematic diagram showing the meshing state of the sprocket with the perforation on the film side, and FIGS. 7(a) and 7(b) explain the state in which the sprocket is in direct contact with the film surface and the phase state that causes the rebound phenomenon. The schematic diagram, FIGS. 8(a) and (b), is a schematic diagram for explaining the force relationship acting on the sprocket in FIG. 7(b), and FIG. 9(a). (b) is a schematic diagram for explaining the sprocket rebound phenomenon. l...Film patrone, 2...Film,
2a, 2b... Perforation, 4... Cylindrical part, 5, 1... Film feeding section, 5a... Feeding port, 9... Opening, lO... Camera, 1
DESCRIPTION OF SYMBOLS 1... Film drive device, 12... Patrone loading chamber, 13... Sprocket, 13a... Sprocket tooth, 15... Part of swing lever, 15a...
... Lever arm, 17 ... Sun gear, 18 ... Planet gear, 19 ... Regulation plate, 23 ... Electric motor, 0 ... Sun gear rotation center, P ... ...Sprocket rotation center (planetary gear rotation center), view... line of sight.

Claims (2)

[Claims] (1) A cylindrical part that stores the roll film in a wound state, and a cylindrical part that extends on one side in the tangential direction to store the film in a straight line, and also positions the perforation on the film's leading end. In a camera in which a film cartridge is loaded, the film cartridge has a perforation on the leading edge side of the film, and the perforation on the leading end side of the film is exposed through the opening when the film cartridge is loaded. It is equipped with a film drive sprocket that meshes with the perforations, and the rotation locus of the sprocket teeth coincides with the intersection on the film surface of a line perpendicular to the film surface passing through the center of rotation of the sprocket in contact with the film surface. The leading edge of the perforation in the feeding direction is located on the film feeding direction side, and the trailing edge of this perforation in the feeding direction is the film surface with the tips of two adjacent sprocket teeth aligned with the film surface. The position of the sprocket when the film cassette is loaded, such that the sprocket tooth coincides with or is located closer to the cassette cartridge part side than the intersection point with the rotation locus of the sprocket teeth. A film drive device characterized by being set. (2) In claim 1, the length in the film feeding direction from the leading edge to the trailing edge of the perforation in which the sprocket teeth of the film drive sprocket engage and engage when loading the film cartridge is set to be longer than that of other perforations. A film drive device characterized by using a film cartridge having an enlarged film.