JPH0435889Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a film cassette loaded with photographic film.

[Prior art and its problems]

Surveillance cameras are mainly installed at entrances and exits, customer service counters, safes, etc. of financial institutions such as banks, and they take pictures of the situation in a predetermined range manually or automatically at fixed intervals as needed. In addition to being used to identify the culprit and to provide photographic evidence when a crime occurs, it also serves as a deterrent to crime. Incidentally, such surveillance cameras require photographic film as a recording medium for taking pictures, and it is desirable that these films be long films in order to reduce the number of film changes. ing. Various types of cassettes for loading such long films have been proposed. For example, as shown in Japanese Utility Model Publication No. 51-7895, plastic molded parts which are combined to provide a light-tight chamber with two parallel large-area side walls, and which are arranged on an axis within the light-tight chamber and perpendicular to the side walls, are used. a supply and take-up spool mounted in the chamber, and a supply hub and take-up spool in the chamber extending substantially perpendicularly from a side wall of a large area within the light-tight chamber for rotatably carrying the supply and take-up spools. and a film take-up hub, each spool having a cylinder providing a film take-up surface, a spindle coaxial with the cylinder, and a device for connecting the cylinder to the spindle. , the hub has a set of spring fingers projecting substantially perpendicularly to the side wall of the large area of the light-tight chamber and arranged equidistantly around a central axis to form a segmented cylindrical bearing; and the spindle has an outer diameter slightly larger than the inner diameter of the segmented cylindrical bearing, such that by displacing the spring fingers from their normal position, the spring fingers restrain the rotational action of the spool. A film cartridge adapted to exert a spring pressure on the spindle is provided, or
As shown in Japanese Patent No. 28589, in a film magazine equipped with a supply spool for supplying film and a take-up spool for winding up the film intermittently fed out by a feed claw via a slip mechanism, A film stopping means, in which a sensing arm and a film stopping arm are fixed in the form of wings on a support shaft, is pivoted close to the transport path for the fed film, and the film on the transport path is almost completely removed by the winding operation of the take-up spool. The film magazine is configured such that the film sensing arm detects that the film is in a straight line, rotates the film stopping means, and presses the film on the transfer path against the wall surface of the magazine with the film stopping arm, thereby preventing the film from moving. is provided, or as shown in Utility Model Publication No. 61-9405,
In a long film magazine that stores long films and sequentially winds them from the supply side through an opening to the take-up side, there is a disk-shaped inside or bottom of the lid of the magazine that corresponds to the brim of the supply spool. A flexible thin plate is deformed and fixed so that its peripheral part is raised in multiple places, and the raised parts are in loose contact with the outer periphery of the collar of the supply spool, and the rotation of the supply spool is gently braked. A long film magazine configured as described above is provided. However, in these conventional cassettes (magazines or cartridges), the film is once led out from the light-shielding chamber to the outside of the light-shielding chamber, and then reintroduced into the light-shielding chamber. The passageway leading to the doorway consists simply of two opposing walls. For this reason, if the width of this passage is large, light may enter the light-shielding chamber from this part, and the light-shielding performance will decrease accordingly.On the other hand, if the width of the passage is narrowed to increase the light-shielding performance, the film When the film is running, the surface of the film comes into contact with the wall of the passageway, and static electricity is generated due to contact friction. The problem is that even if a crime is photographed, the attached dirt or dust or exposure to some parts of the film can cause it to look like a bug-eaten photograph.

[Means to solve problems]

The present invention has been made in view of the above-mentioned problems, and includes a light-shielding chamber, a film outlet connected to the light-shielding chamber, a film inlet connected to the light-shielding chamber, and a film passageway in front of the film outlet. a first sprocket comprising a pair of first walls, a first sprocket having a pawl that engages with a perforation of a film disposed in the light-shielding chamber corresponding to the first wall; a protruding strip provided on one inner wall surface of the first wall; a felt provided on the other inner wall surface of the pair of first walls so as to face the protruding strip; and a felt at the film inlet. a pair of second walls forming a film path at a rear position;
a second sprocket having a pawl that engages with a perforation of a film disposed in the light-shielding chamber corresponding to the second wall; and a second sprocket provided on the inner wall surface of one of the pair of second walls. and a felt provided on the inner wall surface of the other of the pair of second walls so as to face the protruding stripes, and a felt provided on the inner wall surface of the first wall. The second sprocket is configured such that the first sprocket cannot be removed once the felt end hooks onto the first sprocket end, and a resilient material is attached to the second sprocket, and the force of the resilient material causes the first sprocket to be pulled out. To provide a film cassette characterized in that the second sprocket is constructed so that it cannot be pulled out and provides appropriate resistance to rotation.

【Example】

1 to 4 show one embodiment of the film cassette according to the present invention, in which FIG. 1 is a perspective view of the whole, FIG. 2 is a perspective view with the lid opened and the film removed; FIGS. 3a and 3b are perspective views of the inner surface of each lid body, and FIG. 4 is a perspective view of the supply side and winding side light-shielding chambers separated. In each figure, reference numeral 1 denotes a cassette for storing a long film such as a photographic film formed by a molding means using a light-shielding plastic material, for example, a predetermined plastic added with a black material such as carbon black. It is. This cassette 1 consists of a housing 2 on the supply side, a cover 3 on the supply side that cooperates with the housing 2 on the supply side to form one light-shielding chamber on the supply side, a housing 4 on the winding side, and a housing 4 on the winding side. A winding-side lid 5 is configured, which cooperates with the winding-side casing 3 to form one winding-side light-shielding chamber. Two wide and strong basic arms 6 are visible from the peripheral wall 2b of the housing 2 on the supply side, which faces the housing 4 on the winding side.
a, 6b are provided extending vertically, and protrusions 7a, 7b are provided at the tips of these basic arms 6a, 6b toward the outside. The inside of the tip is formed into a substantially tapered shape. 8a and 8b are narrow variable arms provided to extend from the bases of the basic arms 6a and 6b at positions outside thereof;
A and 8b are configured so that they bend when force is applied inward, and return to their original shape with their own restoring force when this force is released. 9a and 9b are claws provided at the tips of the variable arms 8a and 8b, and when these claws 9a and 9b are hooked into holes to be described later, the casing 2 on the supply side and the winding side It is designed to be connected to the casing 4 of. Incidentally, tapered portions 10a, 10b are formed at the tips of the claws 9a, 9b. Reference numeral 11 denotes a flat cylindrical portion extending perpendicularly from the circumferential wall 4b of the winding-side casing 4 facing the supply-side casing 2; is formed into a substantially arc shape, and hooking holes 13a and 13b are formed on both sides of the cylindrical portion 11, into which the claws 9a and 9b are hooked. Therefore, the basic arms 6a, 6 of the housing 2 on the supply side
b and the variable arms 8a, 8b are inserted into the cylindrical portion 11 of the housing 4 on the winding side, the variable arms 8a, 8b are bent inward by the inner wall surface of the tip of the cylindrical portion 11, and then moved to a predetermined position. When the claws 9a, 9b reach the positions of the holes 13a, 13b, the pressure on the variable arms 8a, 8b is released and the original state is restored, and the claws 9a, 9b are inserted into the holes 13a, 13b. The housing 2 on the supply side and the housing 4 on the winding side are connected by being hooked. On the other hand, for a cassette in which the supply side housing 2 and the winding side housing 4 are connected as shown in FIG.
By applying an inward force to the claws 9a, 9b, the variable arms 8a, 8b are bent inward to release the hooks between the claws 9a, 9b and the holes 13a, 13b, and in this state, the basic arms 6a, 6b and The housing 2 on the supply side and the housing 4 on the winding side can be separated by removing the variable arms 8a and 8b from the cylindrical portion 11. When the claws 9a and 9b are engaged with the holes 13a and 13b, the housing 2 on the supply side and the housing 4 on the winding side are firmly and integrally connected without any play. Rather, it is configured so that there is some clearance between them, and even if the supply side housing 2 and the winding side housing 4 are connected, there is some clearance between them. I try to make sure that there is some wobbling. In addition, the left and right direction in FIG.
Rear parts 9aa and 9ba of a and 9b and holes 13a and 13b
This is done by engaging the distal end portions 13aa, 13ba of the base arms 6a, 6b, and the step portions 6aa, 6ba of the basic arms 6a, 6b and the distal end portion 12 of the cylindrical portion 11,
In addition, the vertical direction in Fig. 1 is controlled by the variable arm 8.
The outer surfaces of the bases 8aa and 8ba of a and 8b and the cylindrical part 11
and the protrusions 7 of the basic arms 6a and 6b.
This is done by abutment between a, 7b and the inner wall surface of the cylindrical portion 11. Reference numeral 14 denotes a supply side spool that is detachably attached to a hub (not shown) installed on the bottom surface 2a of the supply side housing 2;
4 is a spindle 15 having a central square shaft portion;
and a cylinder 16 that is fitted onto the rectangular shaft of the spindle 15 and around which the film F is wound. There is no flange as shown. Reference numeral 17 denotes a winding-side spool that is detachably provided to a hub (not shown) installed on the bottom surface 4a of the winding-side housing 4;
Similarly to the supply spool 14, the spool 7 is composed of a spindle 18 having a square shaft at the center, and a cylinder 19 that is fitted onto the square shaft of the spindle 18 and around which the film F is wound. and no flange is provided. Reference numeral 20 denotes a circular rib formed on the inner surface of the bottom surface 2a of the supply side housing 2 at a position around the supply side spool 14 when the supply side spool 14 is arranged with respect to the supply side hub. Yes, this rib 2
Four ribs 2 radially extend from 0 toward the peripheral wall 2b.
1a, 21b, 21c, and 21d are similarly configured. 22 is a circular shape (rib 20
(a circular shape with a diameter somewhat smaller than the diameter of a circle)
This rib 22 is connected to the rib 2.
3a, 23b, 23c, 23d are ribs 21a, 2
It is provided so as to face 1b, 21c, and 21d. In addition, the rib 20 and the ribs 21a, 21b, 21c,
The height of the rib 21d is the same, and the height of the rib 22 and the ribs 23a, 23b, 23c, and 23d are the same, but the height of the rib 20 is configured to be higher than the height of the rib 22. 24 is a rib configured similarly to the rib 20 on the inner surface side of the bottom surface 4a of the housing 4 on the winding side;
a, 25b, 25c, 25d are ribs 21a, 21
Rib configured similarly to b, 21c, 21d, 2
6 is a rib configured similarly to the rib 22 on the inner surface side of the lid surface 5a of the lid body 5 on the winding side; 27a, 2;
7b, 27c, 27d are ribs 23a, 23b, 2
This is a rib configured similarly to 3c and 23d. 28 is a rib provided on the inner surface of the lid surface 3a of the supply side lid 3 almost along the peripheral wall 3b, and when the supply side lid 3 is placed on the supply side casing 2, , the upper end of the peripheral wall 2b of the supply-side housing 2 is sandwiched between the peripheral wall 3b of the supply-side lid 3 and the rib 28. Reference numeral 29 denotes a rib similar to the rib 28 provided on the inner surface of the lid surface 5a of the lid 5 on the winding side, almost along the peripheral wall 5b. In this case, the upper end of the peripheral wall of the housing 4 on the winding side is sandwiched between the peripheral wall 5b of the lid 5 and the rib 29. Reference numeral 30 denotes a sprocket for the film F that is rotatably provided at a corner position of the protruding portion 2c of the housing 2 on the supply side. Claw 3
1 is provided. Reference numeral 32 indicates an inner wall installed on the bottom surface 2a of the housing 2 on the supply side along this sprocket 30, 33 indicates an opening formed in this inner wall 32 for feeding out the film F, and 34 indicates an opening 33 formed in the bottom surface 2a of the housing 2 on the supply side. Formed inner wall 3
Felt is pasted from 2 to the inner surface of one end 2ba of the peripheral wall 2b, 35 is an inner wall provided to connect the other end 2bb of the peripheral wall 2b and the inner wall 32, and 36 is the inner wall of the inner wall 2b of the inner wall 35. This is a protruding strip portion having a substantially arcuate cross section and provided on the side in a direction perpendicular to the running direction of the film F. The felt 34 provided in the passage for feeding the film F, which is sandwiched between the peripheral wall 2b and the inner wall 35, is provided over the entire area in the thickness direction of the cassette between the bottom surface 2a and the lid surface 3a. However, only a portion of the part facing the sprocket 30 is provided as shown in the figure. Even if an attempt is made to pull out the sprocket 30 after it has been installed, the protrusion of the sprocket 30 will catch on the lower end 34a of the felt 34, making it impossible to pull out the sprocket 30. 37 is a sprocket similar to the sprocket 30 of the film F provided at the corner of the protrusion 4c of the housing 4 on the winding side; 38 is a pawl similar to the pawl 31; Incidentally, the sprocket 30 of the film F is rotatable, and although there is little resistance to the rotation,
The sprocket 37 is provided with an elastic spring 39, and the elastic force of this elastic spring presses the sprocket 37 toward the bottom surface 4a, so the rotation of the sprocket 37 is not free, but requires a large rotation. Resistance is at work. Reference numeral 40 denotes an inner wall constructed in the same manner as the inner wall 32 on the bottom surface 4a of the housing 4 on the winding side along the sprocket 37, and 41 denotes a film F formed on this inner wall 40.
An entry opening 42 is configured similarly to the opening 33 for feeding out the felt 34,
The felt 43 attached to the peripheral wall 4b is a protruding strip having a substantially arc-shaped cross section and configured in the same manner as the protruding strip 36 provided on the side of the peripheral wall 4b of the inner wall 40. Reference numeral 44 denotes a locking protrusion provided at an appropriate position on the outer surface of the peripheral wall 4b of the housing 4 on the winding side;
Reference numeral 5 designates a locking piece provided so as to extend from the circumferential wall of the lid body 5 on the winding side facing the protrusion 44, and reference numeral 46 represents a hole provided in the locking piece 45. 47 and 48 are pins provided at predetermined positions in the housing 2 on the supply side, and 49 and 50 are basic arms 6a and 6.
These pins are provided at predetermined positions in b, and holes into which the tips of these pins are inserted are formed in the supply side lid 3, and the supply side lid 3 is connected to the supply side housing 2.
After covering these pins 47, 48, 49, 5
By applying caulking means such as ultrasonic welding to the supply side lid 3, the supply side lid body 3 is integrated with the supply side housing 2. 51 is a film F configured in the housing 2 on the supply side.
A passage opening 52 corresponds to the opening 51 and is formed in the lid 3 on the supply side; 53 is an opening formed in the winding side casing 4 for passing the film F; Reference numeral 54 denotes an opening formed in the lid 5 on the winding side in correspondence with the opening 53. In the cassette 1 constructed as described above, the long film F is wound around the cylinder 16 of the supply spool 14, and the film F is wound around the sprocket 30 through the opening 33 by about 180°. felt 34 and attached to the peripheral wall 2b
and the inner wall 35 through the openings 51, 52.
The film F is stretched out to the outside of the light-shielding room on the supply side, and the film F stretched out to the outside is exposed to the felt 4 stuck to the peripheral wall 4b through the openings 53 and 54.
sprocket 3 through a passage between sprocket 2 and inner wall 40.
The winding spool 17 is wound approximately 180 degrees around the winding spool 17, and is guided through the opening 41 into the light-shielding chamber on the winding side.
When the cassette 1 with the film F arranged in this way is loaded into the camera body, the drive shaft for film winding on the camera body side is connected to the take-up side spool 17, and the drive shaft for film travel is connected to the spool 17 on the winding side. Since the drive shaft is engaged with the sprocket 37 on the winding side,
As photography progresses, the drive shaft for running the film rotates and the film F travels intermittently, and the rotation of the drive shaft for winding the film rotates the winding side spool 17 in a predetermined direction, so that the film F is rotated in a predetermined direction. F is adapted to be wound one frame at a time from the supply side spool 14 to the take-up side spool 17. In the above-mentioned cassette 1, the supply spool 14 and the take-up spool 17 on which the film F is wound are not provided with flanges that sandwich the edges of the film F at both ends thereof. Therefore, the workability when winding the film F around the supply spool 14 and the take-up spool 17 is extremely good. Moreover, as the shooting progresses, the film F is wound from the supply spool 14 to the take-up spool 17, and at this time, the supply spool 14 and the take-up spool 17 are provided with flanges. Even if there is no rib 21 on the inner side of the cassette.
a, 21b, 21c, 21d, 23a, 23b,
23c, 23d, 25a, 25b, 25c, 25
d, 27a, 27b, 27c, and 27d, the edge of the film F comes into contact with these ribs 21a, 21b, . 3 lid surface 3
a, Bottom surface 4a of the housing 4 on the winding side, Lid surface 5 of the lid body 5
Since the film F does not come into contact with a, the frictional resistance is small when the film F travels as the photographing progresses, and therefore static electricity is less likely to be generated. Not, again,
This solves the problem of poor running performance of the film F due to static electricity charging, and furthermore, if dirt or dust adheres to the film F due to static electricity charging, it will not stick to the film F, resulting in shooting that looks like it is eaten by bugs. Photography can be performed well without any problems. That is, the ribs 21a, 21b, . . . can solve the problem caused by not providing flanges on the supply spool and the take-up spool. Furthermore, these ribs 21a, 21b,...
The bottom surface 2a of the housing 2 on the supply side, the lid surface 3a of the lid body 3,
Bottom surface 4a of the housing 4 on the winding side and lid surface 5a of the lid body 5
This greatly improves the mechanical strength of the film, and even though the film F is long and therefore heavy, even if the long film F is loaded in the light-shielding chamber formed by these. , when these surfaces are bent, there is no trace. Further, since the supply side lid 3 is provided with a rib 28 almost along its peripheral wall 3b, and the take-up side lid 5 is provided with a rib 29 almost along its peripheral wall 5b, When the respective lids 3 and 5 are placed over the casings 2 and 4, the upper ends of the peripheral walls 2b and 4b of the casings 2 and 4 are connected to the peripheral walls 3b and 5b of the lids 3 and 5, and the rib 28,
29, so that the light-shielding property in the light-shielding chamber constituted by the casings 2, 4 and the lids 3, 5 is reliably maintained. Incidentally, even if the ribs 28 and 29 are not provided, the casings 2 and 4 and the lids 3 and 5 constituting the light-shielding chamber can be constructed with high dimensional accuracy. Manufacturing the bodies 2, 4 and lids 3, 5 increases the cost accordingly, and the workability of assembling a light-shielding chamber for storing the film from these housings 2, 4 and lids 3, 5 is not good. On the other hand, by providing the ribs 28 and 29, the light-shielding performance does not deteriorate even if the dimensions of the casings 2 and 4 and the lids 3 and 5 are not made highly precise, and there is a margin in the dimensions. The workability of assembling the lids 3 and 5 by covering the separate casings 2 and 4 having the same function is improved. Further, the cassette 1 can be separated from the housing 2 on the supply side and the lid 4 on the take-up side by a separating/coupling means, or
Therefore, when loading the film F, the housing 2 and the lid 3 on the supply side are connected.
It is only necessary to send the film to the film F loading workshop, which reduces transportation costs accordingly, and
After taking pictures using this cassette 1,
It is only necessary to send the winding-side housing 3 and the lid 5, in which the photographed film F is housed, to the photofinishing laboratory, thus reducing transportation costs and requiring a smaller storage space. That's fine. In particular, in the above embodiment, the supply side housing 2
Since the integrity of the cassette 1 and the casing 4 on the winding side is not made strong and some looseness is left when the cassette 1 is connected to the casing 4 on the winding side, loading work when loading the cassette 1 into the camera body is facilitated. In other words, even if the housing 2 on the supply side and the housing 4 on the winding side are configured to be separable, if the means for connecting them uses a fastening member such as a screw, it is difficult to connect them when they are connected. In this case, the housing 2 on the supply side and the housing 4 on the winding side are firmly connected, and they become the same as those that have been integrally configured in advance. However, if the supply side housing 2
In the case where the cassette 4 and the take-up side housing 4 are integrally molded, the drive shaft for winding the film of the take-up side spool disposed in the cassette attachment part on the camera body side and the take-up side casing 4 are integrally molded. Since the positions of the take-up spool 17 on the cassette side and the take-up sprocket 37 on the cassette side are aligned with respect to the drive shaft for running the film of the sprocket 37, the cassette can be installed, but the cassette 4 on the take-up side When using the cassette with replacement, the positions of the take-up spool 17 and the take-up sprocket 37 in the entire cassette may be slightly different, so the casing 4 on the take-up side and the supply side If the cassette is firmly connected to the cassette 2, this deviation cannot be adjusted and the cassette becomes unusable. However, in the above embodiment, since the housing 2 on the supply side and the housing 4 on the winding side are configured to have looseness in their connection, the housing 4 on the winding side
No matter what the combination is between the housing 2 on the supply side and the housing 2 on the winding side, that is, even if there is some variation in the configuration positions of the spool on the winding side, etc., this variation will occur between the housing 2 on the supply side and the winding side. This can be absorbed by the looseness at the connection part with the side housing 4, and the cassette can be attached to the camera body. In the case of normal magnetic tape cassettes, the drive shafts are located on the recording/reproducing device side, corresponding to the supply spool (reel) and take-up spool (reel), so the supply spool and take-up spool It is better if there is no variation in the distance between the spool and the spool.In other words, the housing housing the supply side spool and the housing housing the take-up side spool must be firmly connected. In the case of a cassette loaded with film, the drive shaft for film winding and travel is located on the winding side, so there is a strong connection between the supply side housing and the winding side housing. There is no need for this to be done. Furthermore, since magnetic tape cassettes are small in size, the amount of dimensional deformation caused by environmental (temperature) changes is small; The shape is large, and therefore the amount of dimensional deformation due to environmental changes is inevitably large. For this reason, if the supply-side housing 2 and the take-up-side housing 4 are integrated in advance, or if they are connected with parts such as screws without play, the dimensions may vary due to environmental changes. This deformation not only makes it impossible to load the cassette into the cassette mounting portion of the camera body, but also has the disadvantage that the running performance of the film deteriorates. However, if the housing 2 on the supply side and the housing 4 on the winding side are connected in such a way that looseness remains, as in the above embodiment, the above-mentioned drawbacks can be eliminated. . In particular, since the photographic film F is wound intermittently rather than continuously as in the case of magnetic tape, the film must be loosened to some extent in the path from the supply sprocket 30 to the take-up sprocket 37. Since the film F, especially the perforation part, may break when the film F is wound, the structure is such that there is some looseness in the connection between the housing 2 on the supply side and the housing 4 on the winding side. It is desirable that the film between the supply side sprocket 30 and the take-up side sprocket 37 has some degree of slack no matter what the environment is. In other words, in the case of a cassette loaded with perforated photographic film, it may be possible to separate the cassette into a supply side part and a take-up side part, or it may be a separable type. It is more convenient, and in the case of a separable type, if the structure is such that there is no looseness between the two when they are joined, there will be disadvantages, but the features of a separable type are is reduced by half, and if the structure is such that there is some wobbling between the two when they are combined, the effect of using a separable type will be maximized. Incidentally, the cylindrical portion 11 is provided in the housing 4 on the winding side, and the cylindrical portion 1
The variable arm 8 that is hooked to the holes 13a and 13b of 1
The reason why a and 8b are provided in the supply side housing 2 is that the winding side housing 4 is used many times without being thrown away. If the variable arms 8a, 8b are configured, the variable arms 8a, 8b will deteriorate after long-term use, and the claws 9a, 9b of the variable arms 8a, 8b will be caught in the holes 13a, 13b of the cylindrical portion 11. This is because you may end up not doing it. That is, since deterioration of the cylindrical portion 11 is not considered, the number of times it is repeatedly used increases accordingly. Also, a resilient spring 39 is attached to a sprocket 37 on the winding side provided in the travel path of the film F.
Since the sprocket 37 is arranged so that it cannot rotate freely and a large resistance is applied to the rotation of the sprocket 37, the running force of the film F is transferred to the take-up side sprocket 37 and the film is When the winding force of F is transmitted to the take-up spool 17 and the film F is wound from the supply spool 14 to the take-up spool 17, the film F has good running performance. That is, when the cassette 1 is attached to the cassette mounting portion of the camera body and a photographing operation is performed, the drive shaft for winding the film on the camera body side is inserted into the winding side spool 17. and,
A drive shaft for running the film is inserted into the sprocket 37 on the winding side, and the film F runs frame by frame by intermittent rotation of the drive shaft for running the film.
Intermittent running such as stop, run, stop, etc. is performed from the supply side spool 14 via the supply side sprocket 30 to the take-up side sprocket 37, and the film F that has passed the take-up side sprocket 37 is constantly in a constant state. The film is wound onto a take-up spool 17 which rotates at a constant speed in response to a force from a drive shaft for winding the film which rotates at a high speed. However, at this time, if the sprocket 37 on the winding side is configured to rotate freely,
Sprocket 37 on the winding side and spool 1 on the winding side
7, a so-called jam condition occurs in the film F, and the winding performance of the film F deteriorates.
The drive shaft for film running, which applies intermittent rotational force to the sprocket 37 on the take-up side, is operated by the motor's drive, stop, drive, stop, etc. operations, so the drive shaft stops. Sometimes, inertia in the opposite direction occurs, and as a result, the film F at a position between the sprocket 30 on the supply side and the sprocket 37 on the take-up side may not have adequate slack, and the film F, especially in the perforation part, may not have enough slack. Damage accidents such as cutting occur. However, as in the above embodiment, the rotation of the sprocket 37 on the winding side is not free; instead, the sprocket 37 on the winding side is rotated by means such as an elastic spring 39. If a control means is provided that presses against the bottom surface 4a side and thereby increases the resistance force against the rotation of the sprocket 37, the running of the film F is caused by the intermittent running of the drive shaft inserted into the sprocket 37 on the winding side. However, the reverse inertia force when the drive shaft is stopped is absorbed by the braking means and no longer appears on the surface, and the intermittent running of the film F is performed accurately, and the sprocket 37 on the winding side There is no jamming of the film F between it and the take-up spool 17, and the film F has good winding performance.
An appropriate amount of slack is left in the film F between the two, and accidents that damage the film F no longer occur. Furthermore, the housing 2 on the supply side and the lid 3 of the cassette 1 are fixed together by caulking means such as ultrasonic welding, whereas the housing 4 and the lid 5 on the winding side are fixed together using the lid. 5
A protrusion 4 that is hooked into a hole 46 of a hook piece 45 provided on the side.
4 is provided in the casing 4, and the two are connected by these, and the lid 3 cannot be removed from the casing 2 after the film F is loaded.
The cover 5 on the winding side can be easily removed from the housing 4. Therefore, after photographing with the film F, it becomes easy to take out the photographed film F from the cassette 1 and develop it. Even after taking out the film F for development, the casing 4 and the lid 5 on the winding side are separated by the protrusion 4.
4 and the hole 46 of the locking piece 45, the locking mechanism can be used repeatedly. Furthermore, for example, in the case of a surveillance camera, there are times when it is necessary to take out the film F that has already been taken and develop a portion of it due to the occurrence of a criminal incident.
In such a case, if the casing 4 on the winding side and the lid 5 are fixed together by means such as ultrasonic welding, the photographed film F cannot be taken out unless this fixation is broken. After F is taken out from the housing 4 on the winding side, it is impossible to use it again. Incidentally, in the past, cassettes with a small number of frames of film F, for example, have been provided in consideration of this problem, but this requires frequent replacement of the cassette and is not practical. Therefore, if configured as in the above embodiment,
When a long film F is used, even after a portion of the film is developed as described above, the remaining film can be used, and the film is not wasted. Showa 57-
Publication No. 139932, Publication No. 139940, Publication No. 139932, Publication No. 139940, Publication No. 139932, Publication No. 139940, Publication No.
There is no need to prepare two types of cassettes as in Publication No. 58-38134, and there is no need for the camera body to have a complicated configuration so that these two types of cassettes can be used, and even with an extremely simple configuration, Even if unphotographed parts remain on the film F, only the necessary parts can be developed, and it is extremely economical since there is no need to discard the film or waste the film. . In other words, if you want to develop a part of the image that has already been photographed, remove cassette 1 from the camera body.
The film F is cut between the supply side spool 14 and the take-up side spool 17, and only the photographed portion of the film F is taken out and developed, and the cut end of the film is stretched out from the supply side chamber. By winding the tip onto the take-up spool 17 and placing the take-up lid 5 on the take-up casing 4, the cassette 1 becomes a cassette 1 in which the overall length of the film F is shortened. Therefore, there is very little waste here. Incidentally, the housing 2 and the lid 3 on the supply side are also locked by protrusions 44 and holes 46 like the housing 4 and the lid 5 on the winding side, rather than by caulking means such as ultrasonic welding. However, from the viewpoint of preventing an accident in which the film F is exposed by accidentally opening the lid 3 on the supply side when the cassette 1 is not in use, the housing 2 on the supply side It is preferable that the lid body 3 cannot be opened after the film F is loaded. In addition, the passage between the felt 34 attached to the peripheral wall 2b of the housing 2 on the supply side and the inner wall 35, and the passage between the inner wall and the felt 42 attached to the peripheral wall 4b of the housing 4 on the winding side, Film F passes through, but
These passages are narrow in order to prevent light, dirt, and dust from penetrating inside. For this reason, when the film F passes through, the film F tends to come into contact with the inner wall 35, etc., and this contact friction tends to generate static electricity on the film F, etc., which may cause the film F to be exposed to light, or Although it has the disadvantage that dirt and dust tend to stick to it, if multiple protrusions 36 and 43 are provided on the inner wall,
The film F is less likely to come into contact with the inner wall, and static electricity is not generated due to friction of the film F when passing through the passage, thus solving the above-mentioned drawbacks. Also, due to the plurality of protrusions 36, 43,
It is even more difficult for light to enter the light-shielding chamber formed by the casings 2 and 4 and the lids 3 and 5, and the light-shielding properties are also excellent. In the above embodiment, the light-shielding chamber is composed of two light-shielding chambers, the supply-side light-shielding chamber and the winding-side light-shielding chamber. The same is true even if there is only one light-tight chamber where the take-side spools are placed in the same light-tight room.

【effect】

The film cassette according to the present invention includes a light-shielding chamber,
a film outlet connected to the light-shielding chamber; a film feed-in port connected to the light-shielding chamber; a pair of first walls forming a film passage at a position in front of the film outlet; a first sprocket having a claw that engages with a perforation of a film disposed in the light-shielding chamber; a protruding strip provided on an inner wall surface of one of the pair of first walls; a felt provided on the other inner wall surface of the first wall so as to face the protruding strip; a pair of second walls forming a film passage at a position behind the film feeding port; a second sprocket having a claw that engages with a perforation of a film disposed in the light-shielding chamber corresponding to the wall; and a convex provided on the inner wall surface of one of the pair of second walls. and a felt provided on the inner wall surface of the other of the pair of second walls so as to face the protruding strip, and a felt end provided on the inner wall surface of the first wall. is configured such that the first sprocket cannot be removed once it is caught on the end of the first sprocket, and a resilient material is attached to the second sprocket, and the force of the resilient material causes the second sprocket to The sprocket is constructed to prevent it from being pulled out and to create appropriate resistance to rotation, so the multiple protrusions can effectively block light without narrowing the width of the passage. Therefore, the light-shielding properties inside the light-shielding chamber are better, and it is also more difficult for dirt and dust to enter the light-shielding chamber, and there is less contact between the passage wall and the film, which makes it easier to use when driving. Because the film will not be rubbed by the wall of the passage,
The generation of static electricity due to sliding friction is small, and it can greatly improve the exposure of the film due to the generation of static electricity and the bug-eaten photographs caused by adhesion of dirt and dust, and further enhance the functionality of surveillance cameras.
In addition, the intermittent running characteristics of the film are excellent; for example, there have been no accidents caused by the film jamming, and furthermore, there have been no accidents caused by damage to the perforation of the film, and the assembly process has been improved. It has the advantage of being easy to assemble, as there will be no accidents if the sprocket is pulled out mid-way.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the film cassette according to the present invention, in which FIG. 1 is a perspective view of the whole, FIG. 2 is a perspective view with the lid opened and the film removed; FIGS. 3a and 3b are perspective views of the inner surface of each lid, and FIG. 4 is a perspective view of the supply side and winding side light-shielding chambers separated. 1...cassette, 2,4...casing, 3,5...
Lid body, 14... Supply spool, 17... Winding side spool, 30, 37... Sprocket, 32, 3
5... Inner wall, 34... Felt, 36... Convex strip, 40... Inner wall, 42... Felt, 43...
Convex part, F... film.

Claims (1)

[Scope of utility model registration request] a light-shielding chamber, a film outlet connected to the light-shielding chamber, a film inlet connected to the light-shielding chamber, a pair of first walls forming a film passage at a position in front of the film outlet; and the first wall. a first sprocket having a claw that engages with a perforation of a film disposed in a light-shielding chamber corresponding to the body; and a protrusion provided on an inner wall surface of one of the pair of first walls. , a felt provided on the other inner wall surface of the pair of first walls so as to face the protruding stripes, and a pair of second walls forming a film passage at a position behind the film feeding port. , a second sprocket having a pawl that engages with a perforation of a film disposed in the light-shielding chamber corresponding to the second wall; and an inner wall surface of one of the pair of second walls. and a felt provided on the inner wall surface of the other of the pair of second walls so as to face the protruding strip, the felt provided on the inner wall surface of the first wall. The second sprocket is configured such that the first sprocket cannot be pulled out once the felt end is hooked to the first sprocket end, and an elastic material is attached to the second sprocket;
A film cassette characterized in that the second sprocket cannot be pulled out due to the force of the resilient material and is configured to provide appropriate resistance to rotation.