JPH0473859B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light-shielding cassette for holding a roll or web of photosensitive photographic material wound around a core and for feeding the photographic material through a slit provided in a cut.

The invention is of general utility for all types of cassettes used in apparatus supplied with photographic material in the form of webs, and in particular for cassettes designed for use in apparatus for microfilm and photosetting purposes. has advantages over

A cassette for holding a roll of photosensitive material in the form of an elongated square box in which the roll of photographic material is rotatably supported and has an elongated exit slit in its peripheral wall through which the photographic material is fed is known. There is.

Many of these known types of cassettes are relatively inexpensive given the type of materials used in their construction. However, since assembly and loading are often extremely time consuming, the total cost of the final product, ie, the cassette loaded with photographic material, is rather high.

On the other hand, the steric or structural stability of such cassettes is often insufficient, problems arise regarding light shielding properties, the fixation is unstable, and moisture resistance may not be sufficient.

Many of the above-mentioned drawbacks of the known cassettes are due to the fact that the fixing means devised for the assembly of the components of the cassette are impractical and inadequate, and the light shielding properties are insufficient. It seems so.

The present invention is based on a fixing means devised for assembling a new cassette so that the improved cassette is extremely stable in structure and highly light-shielding, and the means is extremely easy to load and assemble even in a dark room. An object of the present invention is to provide an improved cassette which does not exhibit the above-mentioned disadvantages of the prior art cassettes, in such a way that the components of the cassette are easy to manufacture by known extrusion techniques. be.

It is particularly important for manufacturers of loading cassettes and for users who wish to reload cassettes in a dark room that the cassettes fit easily and firmly and are completely light-tight.

According to the present invention, the cassette has a box-like shape consisting of an outer plate and an end closure wall having an inwardly protruding central hub portion that rotatably supports a roll-shaped object within the box, and The walls of the plate are at least partially of double wall construction, and means provided in at least one of the end closure walls secure the double wall to the skin. The inner wall of the double wall cooperates with the through hole provided in the outer wall of the double wall of the skin so that ambient light passes through the through hole in the outer wall of the double wall. A slit provided in the cassette holds a photosensitive photographic material wound around a core in the form of a roll or web, which acts as a shield to prevent it from falling into the cassette. A light shielding cassette is provided for passage therethrough.

Depending on the type of equipment in which the cassette of the invention is used, the cassette may be of any suitable shape, e.g. prismatic, cubic, parallelepiped, cylindrical, etc., the end closure walls of which are shaped like a skin. It is advantageous if the cross-section and shape correspond substantially.

An exit slot running parallel to the axis of the hub preferably extends along the entire width of the outer wall, preferably between the two end closure walls, and further prevents light from penetrating into the assembled cassette. It is desirable to have a means to prevent this.

Further, the end closure walls are movable and the inner and outer circumferential walls forming a circumferential groove or passage groove for receiving the edge of the skin are spaced apart at the circumferential band from which the corresponding hub portion projects in the axial direction. The end closure wall is located within the hollow space surrounded by the double wall of the outer skin, and is locally provided with an axially protruding portion that extends the inner surface of the end closure wall. .

If the end closure wall is of the type described above, it will fit into the outer panel very smoothly. In order to fit the end closure wall into the skin, the axially protruding portion of the end closure wall must enter the skin before the end of the skin enters the peripheral groove to prevent such introduction. The protrusion provides the correct angular orientation for the end closure in response to skin preparation to be performed. Furthermore, before the skin end enters the peripheral groove in the end closure wall, the hub portion of such end closure wall enters a core of photosensitive photographic material in roll form.

In a preferred embodiment, the cassette of the present invention comprises two movable end closure walls of the type described above, each end closure wall being a mirror image of the other closure wall. The end closure wall may be made of plastic material, for example by injection molding, and the skin will not be damaged if it has been cut lengthwise through a plastic extrusion process.

The cassette of the present invention is provided with a core fixing device through which the key is inserted into the cassette loaded with a roll or web of light-sensitive photographic material wound around the core. The end closure comprises an opening in at least one of the walls. Such a core essentially consists of two concentric cylinders connected to each other by a plurality of radially extending spokes. When the key is inserted into the cassette, it is guided between two adjacent horizontal or flat bars of the core so that the core can be prevented from rotating in the cassette. Then, fix the core in the cassette. A clock-spring movement of a roll of photographic material wound around such a core is thereby reliably prevented. This arrangement provides particularly advantageous results when transporting and handling cassettes loaded with light-sensitive photographic material in roll form. Other forms of properly engaging the key with the core may be used to prevent rotational movement of the core within the cassette, such as a friction fit.

The key and core are made of a material that is sufficiently hard to meet the above objectives.

In the core or end closure wall there is provided means for independently shielding the core from light regardless of whether the core fixing device is inserted into the key cassette. This means is preferably located in the core,
provided within the structure of the cassette itself, preferably in combination with means which function independently to render the optical fixation means of the cassette completely light-tight regardless of insertion of the key into the cassette; It is preferable that the light maze be arranged in a straight line.

In another embodiment of the cassette of the invention, the bottom of the cassette is integrated with the skin of one of the end closure walls to form a removable lid of the other end closure wall. ing.

An embodiment of the cassette of the present invention will be explained based on the drawings.

Referring to FIG. 1, a cassette 1 holding a photosensitive photographic material 2 in roll or web form consists of a skin 3 and two movable end closure walls 4,5. The web-shaped photographic material 2 is wound around a core body 6 made up of two concentric cylinders 7, 8 connected to each other by a plurality of radially extending horizontal bars or flat bars 9. There is. The skin 3, the end closure walls 4, 5 and the core 6 are made of plastic material and are formed by injection molding or extrusion.

The skin 3 is shown in more detail in FIG. 2 and is connected to each other at right angles by three continuous annular end bodies 14, 15, 16, the two ends 17, 18 of which are connected to each other at right angles.
four flat walls 10 extending over the entire width of the skin 3 and freely forming exit channels or slits 19 through which the web-like photographic material is fed when being drawn from the roll 2; 11,1
It stands out from 2.13. On the inner side of the mutually facing ends 17, 18 of the skin 3, elastic strips 20, 21 of velvet, felt, soft plastic material, etc. are applied, respectively, so that the exit passage 19 is light-shielded. ing. In this practical embodiment, the ends 14, 1 of the outer panel 3
5 and 16 form the constituent parts of the outer panel 3, forming a double wall portion formed and extruded at the same time. As a result, three elongated hollow spaces 22, 23, and 24 with triangular cross sections are formed within the space surrounded by the outer panel 3. As shown in Figure 2, the double wall,
That is, the interiors of the walls 25, 26, 27 are arcuate in order to guide the photographic material into the cassette as it is withdrawn from the core 6.
Another hollow space 28 having a trapezoidal cross section is provided at the end 17 of the wall 13, and this space 28 also partially forms a double wall part of the outer panel 3. The hollow spaces 22, 23, 24 and 28 extend over the entire width of the skin 3.

The inner side of the end closure wall 4 is illustrated in FIG.
The inner and outer circumferential wall portions 29 and 30 forming a circumferential groove or passage groove 32 for receiving the inner and outer circumferential grooves 3 are spaced apart from each other.

The end portions 34, 35, 36 of the end closure wall 4 corresponding to the ends 14, 15, 16 of the outer panel 3 include:
Axially projecting portions 37, 38, 39 are provided within the groove 32 extending the inner surface of the end closure wall 4.

The extensions 37, 38, 39 fit into the respective hollow spaces 22, 23, 24 of the skin 3 and serve as guide means for assembling and closing the cassette. On the other hand, the extensions 37, 38, 39 also provide structural strength to the assembled cassette. The fourth end section 40 of the end closure wall 4 has a hollow space 2 surrounded by a trapezoidal double wall located at the end 17 of the wall 13 in the skin 3.
An axially projecting finger-like extension 41 that fits into the groove 32 is provided within the groove 32 .

Elastic tabs 42-45 with adjacent extensions 37-39, 41 and hook-like ends are provided on the outer peripheral wall 29 of the end closure wall 4. An end closure wall 4 is provided on the outside of the double wall portion surrounding the hollow spaces 22, 23, 24 in the outer panel 3.
Holes or slots 46-49 are provided which come into engagement with the respective tabs 42-45 when the respective tabs 42-45 are pressed against the corresponding ends of the skin 3. The inwardly protruding surfaces of the knobs 42 to 45 are tapered to form an inclined cam surface, so that when the end closure wall 4 is pushed into position on the outer panel 3, the knobs 42 to 45 first adjoining the distal end 33 of the skin 3, such connection causes the knob to move outwardly so that the hook-like end of each of the knobs 42-45 engages with the hole 46-49 in the skin 3.
It slides along the holes or slots 46-49 until it fits into the hole or slot 46-49, and then, under the action of the elastic recovery force in the knob 42-45, the knob snaps into the hole 46-49.
49, the end closure wall 4 and the skin 3
A snap-lock engagement is achieved between the Similar cooperating fastening means are provided at the other end of the skin 3 and at the corresponding end wall 5. In this way, the inner walls of the double walls 25, 26, 27 and 55 allow ambient light to pass through the outer panel 3 of the cassette loaded with light-sensitive photographic material.
It functions as a shield that prevents it from falling through the feed holes 46 to 49 inside.

To increase structural strength during assembly, the end closure walls 4, 5 are provided with radial or other reliefs or ribs 50, the relief pattern being adapted to suit the particular equipment in which the cassette is used. It has been carefully crafted.

The end closure wall 5 has a key 5 inserted therethrough.
2 (see Figure 1) is inserted into the cassette, and the core 6
an aperture cooperating with a transverse bar or flat bar 9 of the film support core 6 which secures the core 6 in the cassette so as to prevent the web-like photographic material from performing a clock-spring movement above; A section 51 is provided. Concentric annular walls 53, 54 are provided so as to form a light labyrinth that prevents light from falling through the opening 51 into the cassette independently of the insertion of the key 52 into the cassette. has a circular hub 31 projecting into the end closure wall.

In order to make the cassette moisture resistant, rubber seams (not shown) are installed at the distal end of the skin 3 or in the grooves 32 of the skin 3 and also of the end closure walls 4,5.
46 to 549.

FIG. 4 shows the skin 3 and the end closure wall 4 in a snap locking engagement, from which the snap locking means 42, 46:4 are shown.
3, 47: 44, 48 and 45: 49 cooperate in the double walls or hollow spaces 22, 23, 24 and 25 of the skin 3 so that the light passes through the scissor fixing means into the cassette. The inside of the closed cassette is completely shielded from the sun's rays, since each internal wall 25, 26, 27, 55 acts as a shield to prevent it from reaching the light-sensitive photographic material. It becomes clear that there is. By using the scissor fastening means in the manner described above, the entire outer surface of the cassette is kept smooth and free of protrusions that would be detrimental to the safe handling of the cassette and its safe fitting into the device.

[Brief explanation of the drawing]

FIG. 1 is an exploded view showing one embodiment of the cassette of the present invention. Figure 2 is a side view of the outer panel. FIG. 3 is a plan view of the inner side of the end closure wall. 4 is a side view of the skin of FIG. 2 closed at one of its ends by the end closure wall of FIG. 3; FIG. 1: cassette, 2: roll or web photographic material, 3: outer plate, 4, 5: end closure wall, 6: core, 7, 8: cylinder, 9: horizontal bar or flat bar, 10, 11, 12, 13: wall, 14, 15,
16: End portion, 17, 18: End portion, 19: Outlet passage groove or slit, 20, 21: Elastic band-shaped material, 22, 23, 24: Hollow space, 25, 26,
27: Wall, 28: Hollow space, 29, 30: Peripheral wall, 31: Hub, 32: Peripheral groove, 33: End of outer plate, 34, 35, 36: End portion, 37, 38,
39: Extension part protruding in the axial direction, 40: End part, 4
1: Finger-like extension, 42, 43, 44, 45: Elastic knob, 46, 47, 48, 49: Eyelet or hole, 50: Relief or rib, 51: Opening in end closure wall, 52: Key , 53, 54: annular wall, 55: inner wall.

Claims (1)

[Scope of Claims] 1. A light-shielding cassette suitable for holding a roll of web-like photosensitive photographic material wound around a core and for feeding the photographic material through a slit provided in the cassette. , the cassette has a box shape consisting of an outer panel and an end closure wall having an axially projecting central hub rotatably supporting a roll of photosensitive photographic material in the form of a web within the box of the cassette. In the light shielding cassette,
the skin walls being at least partially double-walled, and at least one of the end closure walls being adapted to snap-lock the end closure wall to the skin; , characterized in that it has an elastic knob that cooperates with a through hole provided in the outer wall of the double wall portion of the outer panel, and further, the inner wall of the double wall portion allows ambient light to pass through the double wall. A light shielding cassette, characterized in that the light shielding cassette acts as a shield to prevent the light from falling into the cassette through the space between the through hole in the outer wall of the part and the elastic knob. 2. At least one of the end closure walls is provided with an opening through which a key is inserted into the cassette, the key cooperating with a core in the cassette to engage the core. A cassette according to claim 1, characterized in that the rolled web of photographic material is prevented from rotating. 3. The core body is characterized by being made up of two concentric cylinders fixed to each other by a plurality of radially extending spokes, and the key is located in the recess between the spokes in the core body. Claim 2, wherein the core is fixed in the cassette and prevents the roll of photographic material from clock-spring movement. The cassette described in. 4. The outer panel is characterized in that it consists of four walls connected to each other by three continuous end bodies, the free ends of the first and fourth walls being connected to the outer panel. Claim 1 characterized in that the plate extends over its entire width and forms a narrow slit through which a web of light-sensitive photographic material is passed, and that at least the end body of the outer plate is double-walled. The cassette according to item 1. 5. The cassette according to claim 4, wherein at least one of the free ends of the first and fourth walls is provided with a double wall portion. (6) inner and outer peripheral walls, at least one of said end closure walls forming a peripheral groove for receiving a corresponding end of said outer skin at the peripheral band from which said hub portion projects in the axial direction; are spaced apart from each other, and at least one of the end closure walls is further provided with a groove in the skin surrounded by the double wall portion of the skin at the location of the peripheral groove. A cassette according to claim 1, characterized in that it is provided with an axially projecting portion cooperating with a corresponding hollow portion of the cassette. 7. The cassette according to claim 6, wherein the hollow portion in the outer panel extends over the entire width of the outer panel.