JP2774866B2 - Film cassette - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a film cassette used for an endoscope camera, for example.

2. Description of the Related Art Generally, a film cassette for an endoscope camera includes a film supply unit and a film take-up unit connected via a bridge. A take-up spool is rotatably housed in the case of the film take-up section. When the film cassette is loaded in the camera for an endoscope, this take-up spool must be connected to the engaging claw of the drive shaft on the camera for the endoscope. In this case, when the take-up spool is moved in the axial direction and connected to the drive shaft on the camera side, the take-up spool is shifted in the width direction of the film.

Thus, when the film cassette is loaded, if the winding spool is shifted in the width direction of the film, the subsequent normal winding of the film cannot be performed.

On the other hand, when the drive shaft on the endoscope camera side is moved in the axial direction to be connected to the engaging claw of the take-up spool, the height of the camera is increased by the amount of movement of the drive shaft. And a mechanism for movably providing the drive shaft is required, resulting in disadvantages such as a complicated configuration on the camera side.

For this reason, usually, a portion on the winding spool side of the film cassette is moved in the axial direction and connected to an engaging claw of the drive shaft (see Japanese Patent Publication No. 61-8420).

In a film cassette of this type, in which the take-up spool is moved to be connected to the drive shaft, the take-up spool is composed of an inner cylinder and an outer cylinder, and the inner cylinder is the same as the outer cylinder. It is configured to be movable in the direction of the drive shaft. Then, the inner cylinder side member is configured to be engaged with the drive shaft by being pushed up by a pin on the camera side. Further, in order to transmit the rotational force from the rotation shaft received by the inner cylinder to the winding outer cylinder, it is necessary to incorporate an engagement means for connecting the inner cylinder and the outer cylinder.

[Problems to be Solved by the Invention] The conventional film cassette as described above has a multi-cylinder structure in which a take-up spool is constituted by an inner cylinder and an outer cylinder, and an engaging means for both cylinders is provided. It has a complicated configuration, such as installation, and has a large number of components. Further, there are drawbacks such as relatively high processing accuracy is required, assembling is troublesome, and manufacturing cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to simplify the configuration near the take-up spool, reduce the number of components, and reduce the processing accuracy of each component. An object of the present invention is to provide a film cassette which is easy to assemble.

Means and Action for Solving the Problems To solve the above problems, the present invention provides a film cassette having a film supply section and a film take-up section, wherein the film cassette has a film winding side end or a film winding end connected thereto. The winding member is wound once with a diameter substantially equal to the outer diameter of the winding spool in the film winding section, and the winding member is wound around the winding-side end of the film or the winding member connected thereto. Locking means for stopping the wound portion so as not to change its winding diameter, and an engaging protrusion projecting inward from the one winding portion, and further winding the engaging protrusion on the winding spool. And an engagement receiving portion for slidably engaging the spool in the axial direction.

According to such a configuration, a simple configuration in which the engagement receiving portion for slidably engaging the engagement protrusion on the film side in the axial direction is provided on the winding spool, the structure can be simplified. In addition, it is possible to provide a film cassette that can reduce the number of parts, reduce the processing accuracy of parts, and can easily assemble.

Embodiment FIGS. 1 to 6 are for explaining a first embodiment of the present invention.

The film cassette 1 according to the first embodiment is used for an endoscope camera 2. FIG. 4 and FIG.
As shown in the figure, the cassette body 3 is configured by connecting a film supply section 5 and a film winding section 6 via a bridge 4. For example, 8 mm or 16 m
The m filming film 7 is wound around and loaded. The leading end portion of the photographing film 7 is pulled out from an exit (not shown) of the film supply unit 5, passes through the entrance 8 of the film winding unit 6, and is introduced into the film winding unit 6, which will be described later. The spool 9 is wound around a spool 9 having a single structure.

An endoscope camera 2 used by loading the film cassette 1 is configured as shown in FIG. That is, it has a cassette storage chamber 11 in which the cassette main body 3 is loaded so as to be able to freely enter and exit from the rear of the camera 2, and the cassette storage chamber 11 is formed by a storage case 12. When loading the cassette main body 3 into the cassette storage chamber 11, the lid (not shown) of the cassette storage chamber 11 is opened, and the cassette main body 3 is inserted in the optical axis direction.

Then, when the lid is closed, the push-up pin 13 provided below the film take-up section 6 is raised to push up the spool 9, and the spool 9 is pulled up by the pawl of the drive shaft 14.
15 to be connected.

As shown in FIGS. 3 and 4, an upper surface opening 22 is formed at the center of the upper surface of the case 21 in the film take-up portion 6 of the film cassette 1. Similarly, a lower surface opening is formed at the lower surface of the case 21. 23 are formed. Although the upper surface opening 22 and the lower surface opening 23 are formed coaxially,
The upper opening 22 has a larger diameter than the lower opening 23. Further, cylindrical flanges 24 and 25 projecting toward the inside of the case 21 are formed continuously at the opening edges of the upper surface opening 22 and the lower surface opening 23. As shown in FIG. 3, the cylindrical flanges 24, 25 are provided with respective annular grooves 26, 27 formed on the take-up spool 9.
To prevent light leakage by fitting into the spool 9
Is in an engaged state for rotatably supporting.

The spool 9 is formed integrally. In the spool 9 having the single structure, the portion located inside the cylindrical flange 24 located on the upper side is formed by the winding drive shaft 14.
Is formed. An engagement receiver 28a that engages with the claw 15 of the hoisting drive shaft 14 is formed at the upper end of the engagement shaft 28. However, when the spool 9 moves upward in the axial direction, the upper end portion of the engaging shaft 28 protrudes from the upper surface opening 22 and the claw 15 of the winding drive shaft 14 on the endoscope camera 2 side described above. The engagement receivers 28a are engaged and connected. Further, a portion 29 located outside the cylindrical flange 24 located above the spool 9 has an upper end formed to be shorter than the engaging shaft 28. Then, at the end of movement in which the spool 9 moves up in the axial direction and engages with the hoisting drive shaft 14, the upper end of the portion 29 located outside the spool 9 hits the inner surface of the upper wall of the case 21 and stops. . As shown in FIG. 3, a coil-shaped spring 20 is provided between the tip of the cylindrical flange 24 and the bottom of the annular groove 26 into which the flange is fitted. After the upper end portion of the joint shaft 28 protrudes from the case 21, the return to the inside of the case 21 is sequentially performed.

Further, as shown in FIGS. 1 and 3, an engaging recess formed by a groove formed along the axial direction is formed on the outer periphery of the take-up spool 9 having a single structure as one member. (Engagement receiving portion) 30 is formed. This engagement recess
The groove forming 30 extends through the entire length of the outer portion 29 of the spool 9 in the vertical direction.

On the other hand, as shown in FIG. 2, an attachment hole 31 having the same diameter is provided at each of the leading edge portion on the leader winding side of the film 7 for photographing and the film portion one roll before this.
a, 31b are perforated. Each of the fastening holes 31a and 31b has a plurality of cuts 32 formed in the periphery thereof. These two fastening holes 31
The connection holes 33a and 31b are aligned with the attachment holes 31a and 31b, and the connection tip 33 as an engagement convex member is penetrated and attached to the a and 31b, and the film 7 is rolled and held in a ring shape. In this case, the size of the loop of the film 7 is set to a size that can be fitted to the take-up spool 9, that is, a circumferential length larger than a circumferential length obtained by multiplying the maximum diameter of the spool 9 by π (maximum circumferential length). You. However, if the size is extremely large, the loop of the film 7 is loose on the outer periphery of the spool 9. One turn is performed with a diameter substantially equal to the winding outer diameter of the spool 9.

The connecting tip 33 is made of a short columnar member, and has a circumferential groove formed in the peripheral surface thereof for fitting and locking the peripheral edges of the attachment holes 31a and 31b. Since the orbital groove 34 is formed as close as possible to the outside of the connecting tip 33, when it is mounted on the film 7, it protrudes relatively largely inside the ring of the film 7, and the amount of protrusion outside is small. .

Then, the end of the connecting tip 33 protruding into the inside of the ring-shaped film 7 is engaged with the engaging recess of the winding spool 9.
The spool 9 is engaged with the spool 9 so as to be slidable along the axial direction of the spool 9. That is, the connecting tip
Reference numeral 33 denotes a locking means for holding and forming the film 7 in a ring shape, and an engaging convex portion which fits into the engaging concave portion 30 and slidably engages.
Make up 35. The connecting tip 33 and the engaging recess 30 into which the connecting tip 33 is fitted are in a relatively marginal engagement state as shown in FIG.

The loading of the film 7 for photography into such a film cassette 1 is performed as follows. First, as shown in FIG. 2, the portion on the leader winding side of the photographing film 7 is rolled by one turn, and the two fastening holes 31a and 31b are aligned and overlapped. Then, the connecting tip 33 is inserted and penetrated into both of the fastening holes 31a, 31b, and the fastening holes 31a, 31
It fits into the peripheral part of 31b and is locked. In addition, fastening hole 3
Since the cut 32 is formed in the periphery of the opening of 1a, 31b,
The connecting chip 33 can be easily inserted into the attachment holes 31a and 31b, and can be securely attached. Then, the loop portion of the photographing film 7 rolled by one roll in this manner is fitted to the outer periphery of the outer portion 29 of the spool 9 as shown in FIG. At this time,
The engaging protrusion 35 protruding inside the connecting tip 33 is
Slide in along it. That is, the portion of the film 7 on the leader winding side is fitted to the outer periphery of the spool 9. Thus, since the connecting tip 33 is fitted into the engaging recess 30 and joined, the relative movement of the spool 9 in the axial direction is free, but it is engaged in the rotating direction. And rotate together. Then, with the film 7 fitted in this way, the spool 9 is inserted into the open case 21 of the film cassette 1 and closed to be loaded, and assembled as the film cassette 1.

When the film cassette 1 is used by being loaded into the camera 2, it is performed as follows. That is, the film cassette 1 is put into the cassette storage chamber 11 and the lid is closed. Then, the pin 13 automatically rises and the return spring 20
The spool 9 is pushed up against the urging force of
Are engaged with the hoisting drive shaft 14 and connected. In this connection operation, the spool 9 moves up, but the film 7 on the outer periphery of the spool 9 does not move, and only the spool 9 moves up. The engaging projection 35 engaging with the engaging recess 30 slides, and the film 7 remains without following. However, the engagement between the engagement concave portion 30 and the engagement convex portion 35 causes the spool 9 and the film 7 to engage with each other in the rotation direction, so that the spool 9 and the film 7 rotate integrally.
Therefore, the spool 9 is moved with the winding operation of the camera 2.
The film 7 can be wound up.

When taking out the film cassette 1 from the camera 2, when the pin 13 is lowered, the spool 9 moves independently of the film 7 by the return spring 20 and returns into the case 21.

In the first embodiment, only one engaging recess 30 is provided on the outer periphery of the take-up spool 9. However, as shown in FIG. The engaging protrusion 35 is fitted and engaged by selectively using any of them. In this way, the assembling work of loading the film cassette 1 with the film 7 can be performed more easily.

FIGS. 8 and 9 show a second embodiment of the present invention. In the second embodiment, a locking means for holding and forming the film 7 in a ring shape, a winding spool 9 and a film 7 are provided.
Is formed using the film 7 itself. In other words, the film 7 protrudes inward and extends along the axial direction of the spool 9 in the vicinity of the leading edge of the photographing film 7 on the leader winding side and the film portion one roll before the film. A pair of engaging projections 41a and 41b having a shape are formed by bending. The cross-sectional shape of the engaging projections 41a and 41b is a so-called dovetail shape in which the width of the protruding tip is larger than the width of the root. The width of the engaging protrusion 41b on the rear end side along the longitudinal direction of the film may be made smaller than that of the engaging protrusion 41a on the front end side so that the fitting is simple. Other configurations are the same as those of the above embodiment.

The pair of engaging projections 41a and 41b are fitted and connected to each other to form a substantially one-turn loop as shown in FIG. Then, the loop 7 is fitted into the outer periphery of the spool 9 as described above, and the film 7 is loaded in a state where the engaging projections 41a and 41b are positioned in the engaging recess 30 and engaged. I do. Thus, the loop of the one winding portion on the leader winding side of the film 7 is such that the film 7 fitted on the outer periphery of the spool 9 is free to move relatively in the axial direction, but the spool 7 is rotated in the rotating direction. 9 and rotate integrally. That is, the same operation and effect as those of the first embodiment can be obtained. Moreover, since the engaging projections 41a and 41b are formed using only the film 7, the number of parts can be reduced as compared with the above-described embodiment using a separate member.

FIG. 10 shows a third embodiment of the present invention. In the third embodiment, the engagement means between the take-up spool 9 and the film 7 is formed by using the film 7 in the same manner as in the second embodiment. And one engagement convex part 1a is formed similarly. Further, the film 7 is used as a means for forming the film 7 in a ring shape.
The nail 51 formed at the tip of the
It is formed and formed at the corresponding place before the winding.

Then, round the leader side of the film 7
By inserting 51 into slit 52, it can be formed into a ring shape. An engaging projection 41a protrudes from the inside, and this is fitted into and engaged with the engaging recess 30. In this case as well, the film 7 can be loaded in the same manner as in the above embodiment, for example, as in the case shown in FIG.

In this case, since the loop of the film 7 does not completely have the same circumferential length, the loop of the film 7 should be larger than the circumferential length of the outer circumference of the spool so that the loop of the film 7 becomes minimum, such as during winding. Configure.

FIG. 11 through FIG. 14 show a fourth embodiment of the present invention. In this embodiment, an engaging hole 61 is formed in the vicinity of the leading edge of the photographing film 7 on the side where the leader is wound up. The projection 62 is formed. The engagement protrusion 62 has a rounded base, and the engagement hole 61
The film 7 is formed into a ring shape by being fitted into and engaging with.
Note that a plurality of cuts 63 are formed in the periphery of the engagement hole 61. For this reason, it is difficult for the engaging projection 62 to come off.

Further, the engaging projection 62 is formed as follows. For example,
It is made as shown in FIG. 13 and FIG. That is,
As shown in FIG. 13, the film 7 is extruded using an extruding punch 65 while being heated, and then a constriction is formed using a clamping punch 66 as shown in FIG. Further, the extruded and expanded portion is crushed by the base 67 to be flat.

Note that an engagement hole 61 formed in the film 7 and an engagement projection 62 are formed.
Not only one pair but also a plurality of pairs may be provided along the width direction of the film 7. When a plurality of engagement recesses 30 are formed on the outer periphery of the spool 9 as shown in FIG. 7, a plurality of pairs of the engagement holes 61 and the engagement projections 62 are formed along the longitudinal direction of the film 7. It may be provided. This is the same in the other embodiments.

Thus, as shown in FIG. 11, the one loop-shaped portion of the film 7 on the leader winding portion side fits on the outer periphery of the spool 9 and can freely move relative to the spool 9 in the axial direction. With respect to the direction of rotation, they are engaged and rotate integrally. That is, the same operation and effect as those of the first embodiment can be obtained. Moreover, since the engagement projections 41a and 41b are formed using only the film 7, the number of parts can be reduced.

FIG. 15 shows a fifth embodiment of the present invention. In this embodiment, the engaging projection 72 is formed by bending the leading edge of the photographing film 7 on the leader winding side at least once inward to form a folded piece. The engaging projection 72 is inserted into and engaged with an engaging recess 73 formed of a narrow groove formed on the outer periphery of the spool 9. The engaging convex portion 72 is formed in the engaging concave portion 73 of the winding spool 9 along the axial direction, so that the engaging convex portion 72 is slidably locked. Further, the leading end of the film 7 is formed in a ring shape,
This structure constitutes a locking means for forming and holding the overlapping portion after winding by a fixing member 74 such as an adhesive or a double-sided tape in one loop.

FIG. 16 shows a modification of the ring forming locking means in the configuration of the fifth embodiment. That is, two pairs of slits 75a, 75b, 7 along the width direction of the film 7.
6a and 76b are separated by one turn to form one set at the lower edge and the other set at the upper edge. Then, the slits 75a, 75b, 76a, 76b of each set are engaged with each other to form a single loop at the end of the film 7.

FIG. 17 to FIG. 19 show a sixth embodiment of the present invention. In this embodiment, a winding member 81 is connected to the leading end of the photographing film 7, and the winding member 81 is wound around a winding spool. The take-up spool 82 itself is configured in substantially the same manner as in the first embodiment,
As shown in FIG. 19, the winding member 81 forms one loop with an outer diameter substantially equal to the winding outer diameter of the spool 82, and is held in that state. A part of this one-turn portion is formed with an engaging projection 88 projecting inward, and this is
The engagement protrusion 83 formed on a part of the outer periphery of the 82 is fitted. The engagement concave portion 83 is formed to be narrow corresponding to the engagement convex portion 88. The winding member 81 is a film 7
A pair of flexible wire bodies 84, 8 derived from the upper and lower ends of
The upper and lower ends of the pair of upper and lower wire members 84 and 85 are again connected to the upper and lower ends of the edge of the film 7 to be locked and held. A plurality of connecting wires 86 are provided at intervals between the pair of upper and lower wire members 84 and 85 to maintain the distance between the wire members 84 and 85. Further, as shown in FIG.
At the tips of the wound wire bodies 84, 85, another connecting wire 87, 87 is laid to form an engagement projection 88 that forms a loop. The engaging projection 88 protrudes toward the inside of the looped winding member 81. As shown in FIGS. 17 and 18, an engagement recess 83 formed in a part of the outer periphery of the spool 82 is formed.
It is fitted in. Further, the engaging concave portion 83 and the engaging convex portion 88 that is inserted into and engaged with the engaging concave portion 83 can relatively slide in the axial direction. In this example,
The width of the film 7 and the distance between the wire bodies 84 and 85
The upper and lower heights substantially coincide with each other so that they do not shift up and down.

When the film 7 is loaded on the take-up spool 82, the take-up member 81 is engaged with the take-up spool 88 by inserting the engageable projection 88 into the engageable recess 83. An annular winding member 81 is inserted around the outer periphery of the spool 82 for mounting. At this time, the winding member 81 is wound around the outer periphery of the spool 82 once, and the engaging projection 88 is engaged with the engaging recess.
It is inserted into 83 and locked, so take-up spool 82
And can be wound up. Further, only the take-up spool 82 can be moved in the axial direction and connected to the hoisting drive shaft 14 on the camera 2 side.

In this embodiment, the winding member 81 connected to the film 7 is used. However, the winding member 81 may function as a second spool wound around the outer periphery of a winding spool 82 having a single structure. You can see. Since this second spool is a wire body, it does not have a peripheral surface.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, an engagement protrusion may be provided on the take-up spool side and an engagement recess may be formed on the film side. That is, an engaging portion is provided on the film side,
What is necessary is just to constitute the engagement receiving part which slidably locks the engagement part in the axial direction on the winding spool side.

[Effects of the Invention] As described above, according to the present invention, a simple configuration in which the engagement protrusion is provided on one of the winding spool and the film side and the engagement receiving portion is provided on the other side is sufficient. Can be simplified, the number of parts can be reduced, the processing accuracy of the parts can be reduced, and a film cassette which can be easily assembled can be provided.

[Brief description of the drawings]

1 to 6 are views for explaining a first embodiment of the present invention. FIG. 1 is a plan view of a film winding portion of a film cassette, and FIG. 2 is a perspective view of a main portion of the film. FIG. 3 is a cross-sectional view of a cassette housing portion of a camera loaded with a film cassette, FIG. 4 is a plan view of the film cassette,
FIG. 5 is a side view of the film cassette, and FIG. 6 is a cross-sectional view of a cassette storage portion of a camera loaded with the film cassette. FIG. 7 is a plan view of a film winding section showing a modification of the first embodiment. 8 and 9 show a second embodiment of the present invention. FIG. 8 is a plan view of a film take-up portion of a film cassette, and FIG. 9 is a perspective view of an end portion of the film. FIG. 10 is a perspective view of a film end showing a third embodiment of the present invention. 11 to 14 show a fourth embodiment of the present invention. FIG. 11 is a plan view of a film take-up portion of a film cassette, FIG. 12 is a perspective view of an end portion of the film, FIG. FIG. 14 is an explanatory diagram of a method of forming the engaging projection. FIG. 15 is a plan view of a film winding section showing a fifth embodiment of the present invention. FIG. 16 is a perspective view of a film end showing a modification of the fifth embodiment of the present invention. 17th
FIGS. To 19 show a sixth embodiment of the present invention. FIG. 17 is a plan view of the film winding section, FIG. 18 is a longitudinal sectional view of the film winding section, and FIG. It is a perspective view of a part. 1 ... film cassette, 2 ... endoscope camera, 6 ...
... Film take-up section, 7 ... Film, 9 ... Spool, 11 ... Cassette storage chamber, 13 ... Pin, 14 ... Winding drive shaft, 30 ... Engaging concave part, 35 ... Engaging convex part, 62 ... engaging projection, 81 ... winding member, 82 ... winding spool,
83: engagement recess, 88: engagement projection.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Eiichi Fuse 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside the Olympus Optical Industrial Co., Ltd. (72) Atsushi Kibaru 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside the Olympus Optical Co., Ltd. (72) Inventor Akifumi Ishikawa 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside the Olympus Optical Co., Ltd. (72) Yoshiji Koda 2-43-2 Hatagaya, Shibuya-ku, Tokyo No. Olympus Optical Co., Ltd. (56) References JP-A-2-77058 (JP, A) JP-A-63-110449 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) ) G03C 3/00

Claims (1)

(57) [Claims] In a film cassette having a film supply section and a film take-up section, a take-up end of the film or a take-up member connected to the end of the film take-up section is provided outside a take-up spool in the film take-up section. Locking means for winding one roll with a diameter substantially equal to the diameter and stopping the wound portion on the winding side end of the film or a winding member connected thereto so as not to change the winding diameter; An engagement protrusion protruding inward from the first winding portion; and an engagement receiving portion for slidably engaging the engagement protrusion with the winding spool in the axial direction of the winding spool. A film cassette.