JPH02108041A - Film cassette - Google Patents

Abstract

PURPOSE:To reduce the force of winding film by positioning guiding rollers which linearly guide the film between both film entrance and exit parts at the respective film entrance and exit parts and respectively fitting them in both cartridge so that they can freely rotate. CONSTITUTION:The film 7 extending over both cartridges 2 and 3 is linearly guided by the guiding rollers 10 and 12 between both film entrance and exit parts 8 and 9. Therefore, the film 7 is made to pass in gaps provided in the film entrance and exit parts 8 and 9 which constitute a light shielding part, so that the film 7 can be prevented from coming into contact with internal and external light shielding wall parts 8a, 8b, 9a and 9b. Since the film 7 can be made to pass between both film entrance and exit parts 8 and 9 without being held and brought into contact with the light shielding wall parts 8a, 8b, 9a and 9b, a light shielding structure hardly becomes frictional resistance at the time of winding the film 7. Thus, the resistance at the time of winding the film becomes minimum and the force of winding film is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a film cassette used, for example, in an endoscope photographing device.

[Prior Art] A film cassette has a cassette body in which a supply cartridge and a winding cartridge are connected by a bridge to form an integrated cassette body, and a winding spool attached to the winding cartridge is rotated in conjunction with the winding operation of a photographing device. This winds up the film that is fed out from the supply spool attached to the supply cartridge. A pair of veratines is attached to each film opening formed in each cartridge, and the film covering both cartridges is inserted between the pair of veratines at both the openings. A pair of veratins attached to each of the film openings maintains a close contact with each other due to their elasticity, thereby blocking light from entering the cartridge at the film opening.

[Problems to be Solved by the Invention] As described above, the light-shielding veratins conventionally provided at the film entrance/exit are configured to be in close contact with each other due to their elastic force, so that the film that passes between them is wound up. There was a problem in that the frictional resistance during film winding was large, and therefore the force required for winding the film was large.

This invention was made in response to the above problems.
To obtain a film cassette capable of reducing film winding force.

[Means for Solving the Problems] In order to achieve the above object, the film cassette of the present invention includes a cassette body in which a supply cartridge and a winding cartridge to which a winding spool is attached are connected by a bridge and integrated; A film entrance/exit portion is provided facing each of the cartridges and has a light-shielding structure that allows the film across both cartridges to pass through without being pinched when in use; The device is equipped with a guide roller which is rotatably mounted and which straightens the film between the film entrance and exit portions.

[Function] In this film cassette, since the film entrance and exit portions of both cartridges have a light-shielding structure, this light-shielding structure can shield light from inside the cartridge and prevent the film from being exposed to light. By linearly guiding the film extending over both sides of the film by a guide roller between the two film entrances and exits, the film will not be pinched by the film entrance and exit, which has a light-shielding structure, during use. Therefore, when the film passes through the film entrance/exit section having a light-shielding structure as the film is wound up, this entrance/exit section hardly causes any frictional resistance. Moreover, since the guide roller is rotatable, no frictional resistance is generated between the guide roller and the film during film winding.

[Embodiment] Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In the figure, 1 is the cassette body, which is the supply cartridge 2.
and a winding cartridge 3 are connected by a bridge 4 and integrated. Both cartridges 2.3, which are integrally molded with the bridge 4, have removable cartridge lids 2b, 3 on bottomed cylindrical cartridge bodies 2a, 3a, respectively, as shown in FIG.
b. A supply sprue 5 is attached to the supply cartridge 2 so that both ends of the supply sprue 5 are rotatably fitted into bearing cylinder portions 2c provided on the cartridge main body 2a and the cartridge cover 2b, and a winding spool 6 is attached to the winding cartridge 3. However, both ends thereof are rotatably fitted and attached to bearing cylinder portions 3c provided on the cartridge main body 3a and the cartridge lid 3b. The film 7 wound around the supply spool 5 is wound onto a take-up spool 6 via a guide roller, which will be described later.

It goes without saying that the supply spool 5 and the winding spool 6 are connected to and rotated by a winding part, a rewinding member, etc. provided in a photographing device such as a camera.

Further, each of the supply cartridge 2 and the winding cartridge 3 is provided with film opening/exit portions 8 and 9 facing each other. These entrance/exit portions 8, 9 have a light-shielding structure that allows the film 7 covering both cartridges 2, 3 to pass through without being pinched. That is, as shown in FIG. 1, in this embodiment, the film entrance/exit section 8 is formed of a part of the peripheral wall of the supply cartridge 2, and has an inner and outer light shielding wall section 8a having a sufficient length to shield light. , 8b are made double with a gap provided between them.

One end of the gap is opened to the outside of the supply cartridge 2 as a film entrance/exit port 8c, and the other end of the gap is opened into the supply cartridge 2.

Also, similar to this entrance/exit section 8, a film entrance/exit section 9 is provided.
is a part in which inner and outer light-shielding walls 3a and 3b, which are part of the peripheral wall of the winding cartridge 3 and have sufficient length to block light, are doubled with a gap between them. One end of the gap is opened to the outside of the winding cartridge 3 as a film entrance/exit port 9c, and the other end of the gap is opened into the winding cartridge 3.

A guide roller 10 is rotatably mounted inside the supply cartridge 2 with a gap between the film entrance and exit section 8 located at an inner end of the film entrance and exit section 8 opened into the supply cartridge 2.

Note that 11. in Figure 2. a indicates a light shielding plate that blocks light at the shaft penetrating portion of the guide roller 10. Similarly, a guide roller 12 is rotatably mounted in the winding cartridge 3, located in the gap between the film openings 9 or at the inner end of the film opening 9 opened in the winding cartridge 3. Note that 11b in FIG. 2 indicates a light shielding plate that blocks light at the shaft penetrating portion of the guide roller 12. These guide rollers 10 and 12 are
It is provided to guide the film 7 that is unwound from the supply spool 5 and reach the take-up spool 6, and to hold the film 7 in a straight line between the film inlet/outlet slots 8 and 9.

In the first embodiment, the film entrance/exit portions 8.9 of both cartridges 2.3 are double light-shielding wall portions 8a, which face each other with a slight gap between the inside and outside.

8b, 9a, and 9b, forming a light shielding structure. Therefore, without using a special light-shielding member such as veratin, both cartridges 2.
By shielding the inside of the film 7 from light, exposure of the film 7 to light can be prevented.

The film 7 extending over both the cartridges 2 and 3 is moved by a guide roller 10 between the film openings 8 and 9.
12, the film 7 is guided in a straight line by the film 7, so that the film 7 is guided in a straight line by
Through this film 7, the inner and outer light-shielding walls 8a, 8b
s9a.

9b can be prevented from coming into contact with it. In this way, without sandwiching the film 7, the light-shielding walls 8a, 8bq
Both film entrance/exit portions 8 do not touch 9a and 9b.
, 9, the light-shielding structure hardly becomes a frictional resistance when the film 7 is wound up.

Furthermore, since the guide rollers 10 and 12 are rotatable, no frictional resistance is generated between them and the film 7 during film winding. Therefore, the resistance during film winding becomes extremely small, so that the film winding force can be reduced.

In the second embodiment of the present invention shown in FIG.
is inclined with respect to the outer light shielding wall parts 8b, 9b, and between these wall parts 8a, 8b, 9a.

The gap provided between 9b is used for film entrance/exit holes 8c and 9.
The C side is progressively wider. The configuration other than this point is the same as the first embodiment, so the explanation thereof will be omitted.

In this second embodiment as well, the same effects as those in the first embodiment described above can be obtained, but the inner light shielding wall portion 8a
. It can be released as shown by the dotted line in Figure 3. Therefore, it is possible to prevent the film 7 from being subjected to large bends that would increase the film winding force.

In the third embodiment of the present invention shown in FIGS. 4 and 5, inner and outer light-shielding wall portions 8a, 8b, and 9a.

9b, a convex portion 8d, 9 protrudes into the gap between them.
d are provided facing each other. Furthermore, the outer light shielding wall portion 8
b, 9b are provided with self-hinge portions ge, 9e near the convex portions 8d, 9d, and the hinge portions 8e,
The portions 8b' and 9b' beyond 9e are urged toward the inner light-shielding walls 8a and 9a by their elastic force.

Therefore, the protrusions 8d and 9d are always in contact with each other. Furthermore, the above portion 8b
', 9b' is an operating part tr4' such as a pin provided on the photographing device side when the film cassette is attached to the photographing device.
It engages with A and is pushed open. In addition,
In FIG. 4, for convenience of explanation, the supply cartridge 2 side is shown as a cross section when it is attached to the photographing device, and the winding cartridge 3 side is shown as a cross section when it is taken out from the photographing device. The configuration other than these points is the same as the first embodiment, so the explanation thereof will be omitted.

In this third embodiment as well, the same effects as in the first embodiment can be obtained, but the inner and outer light shielding walls 8a
, 8b, 9a, and 9b are configured as described above, the light shielding performance at the film entrance/exit portions 8, 9 can be further improved by the contact between the convex portions 8d and 9d.

Furthermore, since the film 7 can be held between the projections 8d and 9d by contact with each other, loosening of the film 7 can be prevented. Furthermore, when the film cassette of this embodiment is mounted on a photographing device and the back cover is closed, the operating member A causes the portions 8b'9b' of the outer light-shielding walls 8b, 9b beyond the self-hinge portions 8e, 9e to become elastic. By being pushed open against the force, the protrusions 8d and 9d are separated from each other. Therefore, during use, the film loading/unloading sections 8, 9 can pass the film 7 across both cartridges 2, 3 without being pinched.

The fourth embodiment of the present invention shown in FIGS. 6 and 7 differs from the first embodiment in the following points.

In other words, the film entrance/exit portion 8 of both cartridges 2, 3,
A bearing frame 13 is attached to 9. Elongated guide holes 1.3a are provided at both ends of the frame 13, and guide rollers 10.12 are rotatably mounted with shafts passing through these elongated holes 13a. The axis of the guide roller 10.12 is movable along the guide elongated hole 13a, and the movement causes the guide roller 10.
．． Reference numeral 12 is arranged to approach and separate from the film openings 8c and 9c to open and close these openings 8c and 9c. As shown in FIG. 6, a torsion spring 14 is attached between the end of the bearing frame 13 and the shaft of the guide roller 10.12.

This spring 14 always biases the guide roller 10.12 in the direction of contacting the film openings 3c, 9c. Further, the shafts 10a, 1.2a of the guide rollers 10, 1.2 pass through both patrones 2, 3 as shown in FIG.
The penetrating end portion engages and disengages with an operating member provided in the photographing device, and as a result of this engagement and disengagement, the guide roller 10.12 moves through the elongated hole 13a.
It is designed to be moved along. Since these unintended configurations are the same as those in the first embodiment, their explanation will be omitted.

In this fourth embodiment, the guide rollers 10.12 are constantly pressed against the film slots 8c and 9c by the biasing force of the torsion spring 14, so that a light-shielding structure is constructed and the interior of both the cartridges 2 and 3 is Prevents the exposure of the film 7 to 1
1-I can. Moreover, the film inlet/outlet 3c of the guide roller 10.12.

Since the film 7 can be clamped by pressing against 9C, loosening of the film 7 can also be prevented. Furthermore, when the film cassette of this embodiment is installed in the photographing device and the back cover is closed, the operating member on the photographing device side and each guide roller 10.
The guide rollers 10.12 are moved along the guide slots 13a of the bearing frame 13 and separated from the film openings 8c, 9c while resisting the elastic force of the torsion spring 14. . Therefore, during use, the film loading/unloading sections 8, 9 can pass the film 7 over both cartridges 2.3 without pinching it. As described above, the same effects as in the first embodiment can be obtained in this fourth embodiment as well.

In each of the above embodiments, a supply spool is attached to the supply cartridge, but this spool may be omitted.

[Effects of the Invention] As explained above, according to the present invention, both the supply side and winding side cartridges are provided with opposite film entrance/exit portions having a light-shielding structure that allows the film to pass therethrough without being pinched. , a guide roller that guides the film linearly between the film entrance and exit portions;
Since it is located at each film entrance/exit portion and is rotatably attached to each of the two cartridges, it is possible to ensure light shielding from inside each cartridge and extremely reduce the frictional resistance during film winding, thereby reducing the film winding force.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention, with FIG. 1 being a cross-sectional plan view of the entire film cassette, and FIG. 2 being a sectional view taken along line 1--2 in FIG. FIG. 3 is a cross-sectional plan view of the entire film cassette showing a second embodiment of the invention. 4 and 5 show a third embodiment of the present invention, FIG. 4 being a cross-sectional view of the entire film cassette, and FIG. 5 being a partial perspective view. 6 and 7 show a fourth embodiment of the present invention, FIG. 6 being a cross-sectional plan view of the entire film cassette, and FIG. 7 being a sectional view taken along line 1--2 in FIG. 2... Supply cartridge, 6... Winding spool, 3
... Winding cartridge, 4... Bridge, 1...
Cassette body, 7... Film, 8, 9... Film entrance/exit portion, 10.12... Guide roller. Applicant's agent Patent attorney Atsushi Tsuboi

Claims (1)

[Claims] A cassette main body is integrated by connecting a supply cartridge and a winding cartridge with a winding spool attached thereto by a bridge. The film is provided with a film entrance/exit portion having a light-shielding structure that allows the film to pass through, and a guide roller located at these film entrance/exit portions and rotatably mounted in each of the two cartridges to linearize the film between the two film entrance/exit portions. A film cassette characterized by: