JPH0493939A - Film cassette - Google Patents

Abstract

PURPOSE:To simplify structure and to reduce the number of parts by providing a licking means for locking the part of the end of a film on a winding side, which rolls up by one roll, an engaging projecting part which projects inside and an engagement receiving part which locks the engaging projecting part so that it can freely slide in the shaft direction of a take-up spool. CONSTITUTION:The part of the photographing film 7 on a leader winding side is allowed to roll up by one roll, and two engaging and bonding holes 31a and 31b are aligned to be superposed. A coupling chip 33 is inserted and penetrates both holes 31a and 31b, and the peripheral parts of the holes 31a and 31b are fitted and locked in a circumferential groove 34. Then, the part of the loop of the film 7 which rolls up by one roll is fitted in the outer periph ery of the outside part 29 of the spool 9. At such a time, the engaging projecting part 35 which protrudes inside the chip 33 is positioned in an engaging recessed part 30 and slides along the recessed part 30. The spool 9 is inserted in the opened case 21 of a film cassette 1 and enclosed in a state where the film 7 is fitted therein, so that the spool 9 is loaded, and it is assembled as the film cassette 1.

Description

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

[Prior Art] Generally, a film cassette for an endoscopic camera is composed of a film supply section and a film winding section that are connected with a bridge in between. A winding spool is rotatably housed in the case of the film winding section. This take-up spool must be connected to an engaging pawl of a drive shaft on the endoscope camera side when the film cassette is loaded into the endoscope camera. In this case, when the take-up spool is moved in its axial direction and connected to the drive shaft on the camera side, the take-up spool is displaced in the width direction of the film.

As described above, if the winding spool shifts in the width direction of the film when the film cassette is loaded, the film cannot be wound normally thereafter.

On the other hand, if the drive shaft on the endoscope camera side is moved in the axial direction and connected to the engaging claw of the take-up spool, the height of the camera will increase by the amount of movement of the drive shaft. In addition, a mechanism for movably providing the drive shaft is required, which results in disadvantages such as a complicated configuration on the camera side.

Therefore, the portion of the film cassette on the take-up spool side is usually moved in the axial direction and connected to the engaging pawl of the drive shaft (see Japanese Patent Publication No. 8420/1983).

In this type of film cassette, in which the take-up spool side is moved and connected to the drive shaft, the take-up spool is composed of an inner tube and an outer tube, and the inner tube is positioned above the outer tube. It has a structure that allows it to move freely in the direction of the drive shaft. The inner cylinder side portion is pushed up with a pin on the camera side to engage with the drive shaft. Furthermore, in order to transmit the rotational force from the rotating shaft received by the inner cylinder to the winding outer cylinder, it is necessary to incorporate an engaging 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-tube structure in which the take-up spool is composed of an inner tube and an outer tube, and a means for engaging the two tubes. It has a complicated configuration, including a number of parts, and a large number of parts. Furthermore, relatively high machining accuracy is required, assembly is troublesome, and manufacturing costs are high.

The present invention has been made with attention to the above-mentioned problems, and its purpose is to simplify the configuration near the take-up spool, reduce the number of parts, and lower the processing accuracy of each part. An object of the present invention is to provide a film cassette that is easy to assemble.

[Means and effects for solving the problems] In order to solve the above problems, the present invention provides a film cassette having a film supply section and a film winding section, in which the winding side end of the film or the film cassette connected thereto is The winding member is wound once with a diameter approximately 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. a locking means for stopping the rolled portion so as not to change its winding diameter, and an engaging protrusion projecting inward from the first winding portion, and further winding the engaging protrusion onto the winding spool. The spool is provided with an engagement receiving portion that is slidably engaged in the axial direction of the spool.

According to such a structure, the structure can be simplified because the take-up spool needs only to be provided with an engagement receiving part that slidably engages the film-side retaining convex part in the axial direction. Moreover, it is possible to provide a film cassette that can reduce the number of parts, lower the processing accuracy of parts, and is easy to assemble.

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

A film cassette 1 according to this first embodiment is used in an endoscope camera 2. As shown in FIGS. 4 and 5, the cassette main body 3 is constructed by connecting a film supply section 5 and a film winding section 6 via a bridge 4. The film supply section 5 has, for example, 8 dragons or 16 dragons.
+n photographic film 7 is rolled up and loaded. The leading end portion of the photographic film 7 is pulled out from the exit (not shown) of the film supply section 5, passes through the opening 8 of the film winding section 6, and is introduced into the film winding section 6, as will be described later. It is adapted to be wound onto a spool 9 having a single structure.

An endoscope camera 2 loaded with this film cassette 1 is constructed as shown in FIG. That is, it has a cassette storage chamber 11 into which the cassette body 3 can be loaded in and out 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.

When the lid is closed, the push-up bottle 13 provided below the film winding section 6 is raised to push up the spool 9, and the spool 9 is engaged with the pawl 15 of the wind-up drive shaft 14. It is designed to be connected.

Further, as shown in FIGS. 3 and 4, an upper opening 22 is formed at the center of the upper surface of the case 2 in the film winding section 6 of the film cassette 1, and a lower opening 22 is formed at the center of the lower surface of the case 21. A portion 23 is formed. The upper surface opening 22 and the lower surface opening 23 are formed coaxially, but the upper surface opening 22 is formed with a larger diameter than the lower surface opening 23. Furthermore, cylindrical flanges 24 and 25 that protrude into the case 21 are continuously formed at the edges of each of the upper opening 22 and the lower opening 23. As shown in FIG. 3, the cylindrical flanges 24 and 25 fit into the respective annular grooves 26 and 27 formed in the winding spool 9 to prevent light leakage and to support the spool 9 rotatably. is in a state of alignment.

The spool 9 is integrally formed, and in the spool 9 having a single structure, the portion located inside the upper cylindrical collar 24 is connected to the winding drive shaft 1.
4 is formed. In addition, the claw 15 of the winding drive shaft 14 is provided at the upper end portion of the engagement shaft portion 28.
An engagement receptacle 28a that engages with is formed. When the spool 9 moves upward in the axial direction, the upper end portion of the engagement shaft 28 protrudes from the upper surface opening 22.
Claw 1 of the winding drive shaft 14 on the endoscope camera 2 side described above
The engagement receiver 28a is adapted to engage with and connect to 5. Furthermore, a cylindrical collar 24 located above the spool 9
The upper end side of the portion 29 located on the outside of the above-mentioned engagement shaft portion 2
It is formed shorter than 8. At the end of the movement when the spool 9 rises in the axial direction and engages with the winding drive shaft 14, the upper end of the outer portion 29 of the spool 9 hits the inner surface of the earthen wall of the case 21 and stops. .

As shown in FIG. 3, a coiled spring 2 is provided between the tip of the cylindrical collar 24 and the bottom of the annular groove 26 into which it is fitted.
0 is provided, and this spring 20 causes the spool 9 to
After the upper end portion of the engagement shaft portion 28 protrudes from the case 21, it returns into the case 21.

Furthermore, as shown in FIGS. 1 and 3, the outer periphery of the take-up spool 9, which has a single structure as one member, has an engaging recess formed by a groove formed along its axial direction. (An engagement receiver part) 30 is formed. The groove forming the engagement recess 30 is formed to penetrate the entire length of the outer portion 29 of the spool 9 from top to bottom.

On the other hand, as shown in FIG. 2, there are fastening holes 31 of the same diameter in each of the leading edge of the photographic film 7 on the leader winding side and the film part one roll in front of this.
a and 31b are bored. Each fastening hole 31a, 31
b has a plurality of notches 32 formed on its periphery. Both of the fastening holes 31a and 31b have the fastening holes 31a and 31b.
.

31b are aligned, the connecting tip 33 as an engaging convex member is passed through and attached, and the film 7 is rolled up and held and formed into a ring shape.

In this case, the size of the ring of the film 7 is set to be a size that can be fitted into the take-up spool 9, that is, the circumference is set to be larger than the circumference (maximum circumference) obtained by multiplying the maximum diameter of the spool 9 by π. Ru. However, if the ring is made too large, the ring of the film 7 will become bulky around the outer circumference of the spool 9, so it is usually best not to make it too large and to just loosely follow the outer circumference of the spool 9.

One turn is made with a diameter approximately equal to the winding outer diameter of the spool 9.

This connecting chip 33 is made of a short cylindrical member, and has a circumferential groove 34 formed in its peripheral surface into which the peripheral edges of the above-mentioned locking holes 31a and 31b are fitted and locked. This circumferential groove 34
is formed as close as possible to the outside of the connecting chip 33, so when it is attached to the film 7, the film 7
It protrudes relatively largely towards the inside of the annular shape, and only a small amount towards the outside.

Then, the end of the connecting tip 33 protruding inward from the ring-shaped film 7 fits into the engagement recess 30 of the take-up spool 9 and engages with the spool 9 in a slidable manner along the axial direction. It has become. In other words, the connecting tip 33 constitutes a locking means for holding and forming the film 7 in a ring shape, and an engaging protrusion 35 that fits into the engaging recess 30 and engages in a slidable manner. Note that the connecting tip 33 and the engaging recess 30 into which it is fitted are in a relatively loosely engaged state as shown in FIG.

The photographic film 7 is loaded into the film cassette 1 as described below. First, as shown in FIG.
The roll is rolled up and the two fastening holes 31a and 31b are aligned and overlapped. Then, both of the fastening holes 31a, 3
Insert the connecting chip 33 into 1b and pass through the circumferential groove 34.
The peripheral portions of the locking holes 31a and 31b are fitted into and locked. Note that since notches 32 are formed on the periphery of the anchoring holes 31a, 31b, the anchoring holes 31a,
The connecting tip 33 can be easily inserted into the connecting tip 31b and securely engaged. Next, as shown in FIG.
It is fitted onto the outer periphery of the outer portion 29 of. At this time, the engaging convex portion 35 protruding inwardly of the connecting tip 33 is positioned within the engaging recess 30 and slides therealong. That is, the ring portion of the film 7 on the leader winding side fits into the outer periphery of the spool 9. Therefore, the connecting tip 33 is inserted into the engagement recess 30.
Since the spool 9 is fitted and engaged, the spool 9 is free to move relative to the axial direction, or it is engaged in the direction of rotation and rotates integrally. Then, with the film 7 fitted thereon, the spool 9 is inserted into the open case 21 of the film cassette 1 and closed to be loaded, and the film cassette 1 is assembled.

Further, when this film cassette 1 is loaded into the camera 2 and used, it is carried out as follows.

That is, this film cassette 1 is placed in the cassette storage chamber 1.
1 and close the lid. Then, the pin 13 automatically rises to push up the spool 9 against the biasing force of the return spring 20, and the stop shaft 28 is engaged with and connected to the winding drive shaft 14. In this connecting operation, the spool 9 rises, but the film 7 on the outer periphery of the spool 9 does not move.
Only spool 9 rises. The engagement protrusion 35 that engages with the engagement recess 30 slides, and the film 7 remains without following. However, due to the engagement between the engagement recess 30 and the engagement protrusion 35, the spool 9 and the film 7 are engaged with each other in the rotational direction, and rotate integrally.

Therefore, along with the winding operation of the camera 2, the spool 9
The film 7 can be wound up.

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

In this first embodiment, only one engagement recess 30 was provided on the outer periphery of the winding spool 9, but as shown in FIG. One of them is selectively used to fit and engage the engagement protrusion 35.

In this way, the assembly work of loading the film 7 into the film cassette 1 can be performed more easily.

8 and 9 show a second embodiment of the present invention. In this second embodiment, the locking means for holding and forming the film 7 in a ring shape and the means for engaging the film 7 with the take-up spool 9 are formed using film parts. In other words, there is a gap between the part of the photographic film 7 near the leading edge on the leader winding side and the part of the film one roll in front of this, which protrudes toward the inside of the film and is long along the axial direction of the spool 9. - Form a pair of engaging convex portions 41a and 41b by bending.

The cross-sectional shape of the engaging protrusions 41a and 41b has a so-called dovetail groove shape in which the width of the protruding tip portion is larger than the width of the root portion. Note that the width of the engagement protrusion 41b on the rear end side in the longitudinal direction of the film may be made smaller than that of the engagement protrusion 41a on the front end side, so that fitting can be made easier. The other configurations are the same as those of the above embodiment.

As shown in FIG. 8, the pair of engaging convex portions 41a and 41b fit together and connect to each other to form approximately one loop. Then, this ring portion is fitted onto the outer periphery of the spool 9 as described above, and the engaged protrusion 41a is engaged.

41b is positioned in the engagement recess 30 and the film 7 is loaded in the engaged state. Therefore, the ring of the first winding portion of the film 7 on the leader winding side allows the film 7 fitted to the outer periphery of the spool 9 to move freely in the axial direction, but
In the direction of rotation, it engages with the spool 9 and rotates integrally with it. In other words, the same effects as in the first embodiment can be obtained. Moreover, since the engaging protrusions 41a, 41b are formed using only the film 7, the number of parts can be reduced compared to the above-mentioned embodiments in which separate members are used.

FIG. 10 shows a third embodiment of the invention. In this third embodiment, the means for engaging the take-up spool 9 and the film 7 is formed by using the film 7 as in the second embodiment. One engaging convex portion 41a is formed in the same manner.

The film 7 is used as a means for forming the film 7 into a ring shape, and a claw 51 formed at the tip of the film 7 and a slit 52 into which the claw is inserted are formed at corresponding positions one roll in front.

Then, round the leader end side part of the film 7, and
1 into the slit 52, it can be made into a ring shape. An engagement convex portion 41a protrudes from the inside thereof, and is fitted into the engagement recess 30 for engagement.

In this case as well, the film 7 can be loaded in the same manner as in the above embodiment, for example in the case shown in FIG.

In this case, the rings of the film 7 do not have exactly the same circumference, so when winding, etc., the rings of the film 7 should be made larger than the circumference of the spool to minimize the rings. Configure. .

11 to 14 show a fourth embodiment of the present invention. In this embodiment, an engagement hole 61 is formed in the vicinity of the most extreme edge of the leader winding side of the photographic film 7, and an engagement hole 61 is formed in a portion of the film one roll in front of the leading edge of the photographic film 7. A convex portion 62 is formed. The engagement protrusion 62 has a constricted rounded base, and is fitted into the engagement hole 61 and engaged to form the film 7 in a ring shape. Note that a plurality of notches 63 are formed on the periphery of the engagement hole 61. This makes it difficult for the engagement protrusion 62 to come off.

Furthermore, the engaging convex portion 62 is formed as follows.

For example, it is made as shown in FIGS. 13 and 14.

That is, as shown in FIG. 13, the film 7 is extruded using an extrusion punch 65 while being heated, and then
As shown in the figure, tightening is performed by using a punch 66 to form a constriction. Further, the extruded and inflated portion is crushed on a table 67 to make it flat.

Note that the engagement holes 61 and the engagement protrusions 6 formed in the film 7
2 may be provided not only in one pair but also in multiple pairs 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. It may be provided. This point also applies to other embodiments.

As shown in FIG. 11, the one-turn ring-shaped portion of the film 7 on the leader winding portion side fits on the outer periphery of the spool 9 and is free to move relatively in the axial direction. In the direction of rotation, they engage and rotate integrally. In other words, the same effects as in the first embodiment can be obtained. Moreover, since the engaging protrusions 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 leading edge of the photographic film 7 on the leader winding side is folded inward one or more times to form a folded piece to form an engaging convex portion 72. 20 Engagement convex portion 72
is an engagement recess 7 consisting of a narrow groove formed on the outer periphery of the spool 9.
It is designed to be locked by inserting it into 3. The engaging convex portion 72 is formed along the axial direction in the engaging concave portion 73 of the winding spool 9, and is adapted to slidably lock the engaging convex portion 72. Further, the tip of the film 7 is formed into a ring shape, and the overlapping portion after the first roll is formed with a fixing member 74 such as an adhesive or double-sided tape to form a locking means to hold the film 7 in the shape of a ring.

In addition, FIG. 16 shows a modification of the ring-shaped locking means in the configuration of the fifth embodiment.

That is, two pairs of slits 75a, 75b, 76a, 76b along the width direction of the film 7 are separated by one roll, one set is formed on the lower edge, and the other set is formed on the upper edge. Form. Then, each set of slits 75
a, 75 b, 76 a.

76b are engaged to form one loop at the end of the film 7.

17 to 19 show a sixth embodiment of the present invention. In this embodiment, a winding member 81 is connected to the leading end of the photographic film 7, and the winding member 81 is wound around a take-up spool 82.

The winding spool 82 itself is constructed in substantially the same manner as in the first embodiment, but as shown in FIG. It forms a ring and is held in that state. A portion of this one-wound portion is formed with an engaging protrusion 88 that projects inward, and is adapted to be fitted into an engaging recess 83 formed on a portion of the outer periphery of the spool 82. . This engagement recess 83
is formed narrowly to correspond to the engagement convex portion 88. The winding member 81 is provided with a pair of flexible wire bodies 84.85 led out from the upper and lower ends of the film 7, and the ends of the upper and lower pair of wire bodies 84.85 are connected again to the edge of the film 7. It is connected and held at the upper and lower ends of. A plurality of connecting wires 86 are installed at certain intervals between the upper and lower wire bodies 84 and 85.
．． Maintain a distance of 85.

Furthermore, as shown in FIG. 19, a wire body 84.
Another connecting wire 87.87 is installed at the tip of 85 to form an engaging convex portion 88 forming a loop. The engagement convex portion 88 is formed into a ring shape and protrudes toward the inside of the member 81 . As shown in FIGS. 17 and 18, an engaging recess 8 is formed in a part of the outer circumference of the spool 82.
It is embedded in 3. Furthermore, the engagement recess 83 and the engagement protrusion 88 that is inserted into and engaged with the engagement recess 83 are configured to be able to slide relative to each other in the axial direction. In this embodiment, the width of the film 7 and the width of the interval between the wire bodies 84 and 85 approximately correspond to the vertical height within the case 21, so that they do not shift vertically.

When loading the film 7 onto the take-up spool 82, the winding is done by inserting and locking the engaging protrusion 88 of the member 81 into the engaging recess 83. The ring-shaped winding member 81 is inserted and attached to the outer periphery of the take-up spool 82. At this time, the winding member 81 is wound once around the outer periphery of the spool 82, and its engaging protrusion 88 is inserted into the engaging recess 83 and locked.
It rotates together with the winding spool 82 and can be wound up. Further, only the winding spool 82 can be moved in the axial direction and connected to the winding drive shaft 14 on the camera 2 side.

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

It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be made without changing the gist of the invention. For example, an engaging protrusion may be provided on the take-up spool side and an engaging recess may be formed on the film side. That is, an engaging part may be provided on the film side, and the engaging part that locks the engaging part on the take-up spool side in a slidable manner in the axial direction may constitute a part.

[Effects of the Invention] As explained above, according to the present invention, it is sufficient to have a simple structure in which an engaging convex portion is provided on one side of the winding spool and the film side, and an engaging portion is provided on the other side. It is possible to provide a film cassette whose structure can be simplified, the number of parts can be reduced, the processing accuracy of parts can be lowered, and assembly work is easy.

[Brief explanation of drawings]

1 to 6 are for explaining the first embodiment of the present invention. FIG. 1 is a plan view of the film winding section of the film cassette, and FIG. 2 is a perspective view of the main parts of the film. , Figure 3 is a sectional view of the cassette storage part of the camera loaded with a film cassette, Figure 4 is a plan view of the film cassette,
FIG. 5 is a side view of the film cassette, and FIG. 6 is a sectional view of the cassette storage portion of the 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 being a plan view of the film winding section of the film cassette, and FIG. 9 being a perspective view of the end 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, in which FIG. 11 is a plan view of the film winding section of the film cassette, FIG. 12 is a perspective view of the end of the film, FIG. FIG. 14 is an explanatory diagram of a method of forming the engaging convex portion. FIG. 15 is a plan view of a film winding section showing a modification of the 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. 17 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. 19 is a plan view of the film winding section. FIG. 3 is a perspective view of the end of the film. 1... Film cassette, 2... Endoscope camera,
6... Film winding section, 7... Film, 9...
- Spool, 11... Cassette storage chamber, 13... Pin, 14... Winding drive shaft, 30... Engagement recess, 3
5... Engaging protrusion, 62... Engaging protrusion, 81... Winding member, 82... Winding spool, 83...
Engagement concave portion, 88... Engagement convex portion.

Claims (1)

[Claims] In a film cassette having a film supply section and a film winding section, the end of the film on the winding side or the winding member connected thereto has a diameter approximately equal to the outer diameter of the winding spool in the film winding section. a locking means for securing the first-rolled portion to the winding-side end of the film or a winding member connected to the winding-side end of the film so as not to change the winding diameter; The winding spool is further provided with an engaging convex portion projecting inward, and the winding spool is provided with an engaging receiving portion for slidably locking the engaging convex portion in the axial direction of the winding spool. film cassette.