JPH08201909A - Film pressing block - Google Patents

Abstract

PURPOSE: To reduce the number of parts and to make a film pressing block one unit by constituting the film pressing block of a plate, an abutting roller and a compressive torsion spring. CONSTITUTION: The film pressing block 2 is constituted of the plate 10, the abutting roller 28 and the compressive torsion spring 26. Besides, boss parts 22 and 24 almost coaxial with the shaft parts 12 and 14 of the plate 10 are formed opposite to each other and protruded toward the inside from an aperture part 18 formed at a part corresponding to the almost center of the shaft parts 12 and 14. Then, the spring 26 is fitted to the boss parts 22 and 24 of the plate 10. Since the block 2 assembled in such a way has the roller 28 and the spring 26 fitted to the plate 10 without making them fall, it can be assembled and kept as a single body. Besides, it can be assembled to the back cover of a camera layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film pressing block for pressing a film of a camera on a take-up spool.

[0002]

2. Description of the Related Art A photographic film for a camera is stored in a cartridge, and this cartridge is held in a cartridge storage chamber inside the camera body. When the film is loaded, the film is pulled out from the cartridge, the perforations formed at both ends of the film are engaged with the teeth of the take-up sprocket, and the tip end thereof is put on the take-up spool to close the case back. To keep the film in close contact with the take-up spool, the back cover of the camera is provided with a film pressing block, which is located near the take-up spool when the back cover of the camera is closed and the tip of the block is the take-up spool. The upper film is attached so as to press it onto the take-up spool. The film is wound on the take-up spool by the rotational drive of the take-up sprocket and the take-up spool. The conventional film pressing block is
It is composed of a bent leaf spring and a roller rotatably supported at one end of the leaf spring, and the other end of the leaf spring is fixed to the back cover of the camera with a screw or the like. This film pressing block is configured so that the roller at the tip of the plate spring presses the film onto the take-up spool by the urging force of the plate spring.

[0003]

However, since the conventional film pressing block uses a leaf spring which is easily deformed, it is easily deformed by an erroneous operation such as bending the leaf spring by touching with hand when loading the film. Had a drawback. In order to solve this problem, a plate and a torsion spring and a support member provided on the camera back cover are inserted into a single support shaft so that the plate and the torsion spring can be rotated with respect to the camera back cover. , A film pressing block has been proposed in which a plate is rotated and biased toward a spool by a torsion spring. But,
This type of film pressing block has a problem that the workability of assembling is poor due to the work of inserting the supporting shaft. Further, since the plate, the torsion spring, and the support shaft are integrated with each other only by inserting the support shaft, the plate, the torsion spring, and the support shaft are stored as a single film pressing block when removed from the camera back cover. There was also a problem that I could not do it. Further, since the plate and the support shaft which are separate members are used, there is a problem that the number of parts increases.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a film pressing block which is easy to assemble, has a small number of parts, and is resistant to deformation.

[0005]

In order to achieve the above object, the present invention is directed to a plate having a contact member for contacting a film at a front end thereof, and a pair of protrusions provided from a pair of opposite end faces of the plate. Support shaft, an opening formed between a pair of support shafts of the plate, a pair of bosses projecting from a pair of end faces facing the opening, a compression / torsion spring supported by the pair of bosses, The pair of support shafts are rotatably supported by a pair of support members formed on the back cover of the camera, and the compression / torsion spring presses the plate and the contact member of the plate presses the film onto the spool. It is characterized by biasing in the direction. Also,
A configuration is also possible in which the distance between the pair of bosses is set shorter than the natural length of compression of the compression / torsion spring. Further, the support shaft and the boss may be integrally formed with the plate. It is also possible that the contact member is a roller rotatably supported by the end of the plate. Further, the contact member may be integrally formed with the plate.

[0006]

EXAMPLES The present invention will be described below based on examples.
A camera having a film pressing block according to the present invention,
It is shown in FIG. 1 with the case back opened. When loading the film, pull out the film 1 from the cartridge and
The perforations formed at both ends of the sprocket are engaged with the teeth of the winding sprocket 110. Further, the back cover of the camera is closed with the leading end of the drawn film 1 being in contact with the take-up spool 100. Film presser block 2
Is provided on the back cover of the camera. When the back cover of the camera is closed, the block 2 is attached so that the tip of the block 2 is in a position to press the film 1. Further, adjacent to the film pressing block 2, there are provided sprocket roller pairs 52 and 54 for engaging the perforations of the film 1 with the teeth of the winding sprocket 110.

When the back cover of the camera is closed, the tip of the film pressing block 2 comes into contact with the film 1 on the take-up spool 100. When the sprocket 110 and the take-up spool 100 start rotating in this state, the film 1 is taken up by the film pressing spool 100.

The structure of the film pressing block according to this embodiment will be described with reference to FIGS. 2 is a plan view of the film pressing block, and FIG. 3 is a front view thereof. As shown in FIG. 2, the film pressing block 2 includes a plate 10, a contact roller 28, and a compression / torsion spring 26. The plate 10 is made of a resin having elasticity, and the shaft portion 12 and the shaft portion 14 which are coaxial with each other are provided on both end surfaces of the plate 10.
Are formed to project. Further, a rectangular opening 18 is formed in a portion of the plate 10 that is substantially in the center of the shaft portion 12 and the shaft portion 14. Further, the boss portion 2 which is substantially coaxial with the shaft portions 12 and 14 is directed inward from the opening portion 18.
2. Boss portions 24 are formed so as to face each other and project. A predetermined gap is set between the tip of the boss portion 22 and the tip of the boss portion 24.

Further, roller supporting portions 32 and 34 for rotatably supporting the contact roller 28 are provided at the tip of the plate 10. Holes 32b and 34b and openings 32a and 34a are formed in the roller support portions 32 and 34. The inner diameters of the holes 32b and 34b are slightly larger than the diameter of the support shaft 29 of the contact roller 28, and the openings 32a and 34a are formed.
Is set to be slightly smaller than the diameter of the support shaft 29. Since the roller support portions 32 and 34 are elastic bodies,
By pushing the support shaft 29 of the contact roller 28 into the holes 32b and 34b through the openings 32a and 34a, the contact roller 28 is rotatably supported by the roller support portions 32 and 34.

The boss portion 2 of the film pressing block 10
A compression / torsion spring 26 is attached to the units 2 and 24. The inner diameter of the wound portion of the compression / torsion spring 26 is slightly larger than the dimensions of the boss portions 22 and 24, and the natural compression length of the compression / torsion spring 26 is the boss portions 22 and 24.
Since it is set to be longer than the interval, the compression / torsion spring 26 is compressed and contracted, and the compression is released between the boss portions 22 and 24 to return to the natural length, so that the boss portion 22, Since 24 is inserted, the compression / torsion spring 26 is rotatably supported without coming off from between the boss portions 22 and 24.

The film pressing block 2 assembled in this manner has a contact roller 28 and a compression / torsion spring 2.
Since both 6 are attached to the plate 10 without coming off, the film pressing block 2 can be assembled, stored as a single unit, and later assembled to the camera back cover.

Next, the mounting structure of the film pressing block to the camera back cover according to this embodiment will be described with reference to FIGS. 4 is a plan view of the mounting structure of the film pressing block, and FIG. 5 is a sectional view taken along the line AA ′ of FIG. As shown in FIG. 5, support members 42 and 44 made of an elastic body are provided on the camera back cover. The support members 42, 44
Has holes 42b and 44b and openings 42a and 44a. The inner diameters of the holes 42b and 44b are set to be slightly larger than the shaft diameters of the shaft portions 12 and 14, and the widths of the openings 42a and 44a are set to be slightly smaller than the shaft diameters of the shaft portions 12 and 14. Since the support members 42 and 44 are elastic bodies, the film pressing block 2 can be rotated by the support members 42 and 44 by pushing the shaft portions 12 and 14 of the plate 10 into the holes 42b and 44b through the openings 42a and 44a. Supported. A spring contact member 80 is formed on the camera back cover at a position where one end of the compression / torsion spring contacts.

In this way, the film pressing block 2
When attached to the camera back cover, compression / torsion spring 2
6, one end is brought into contact with the spring contact member 80, and the other end is urged to rotate the plate 10 counterclockwise in the drawing. On the other hand, as shown in FIG. 2, a stopper portion 11 is formed at the rear end portion of the plate 10. When the contact roller 28 is not in contact with the film 1, for example, when the back cover is opened, the stopper portion 11 contacts the camera back cover, so that the plate 10 does not open from the back cover more than a predetermined angle.

When the film 1 is loaded, the plate 10 is provided with a compression / torsion spring 26 while changing the angle from the camera back cover according to the amount of the film 1 wound on the take-up spool 100. By the power
The contact roller 28 is pressed against the film 1.

Next, the pair of sprocket rollers 52, 54 for engaging the perforations of the film 1 with the teeth of the film winding sprocket 110 will be described.
As shown in FIG. 5, a sprocket roller pair 52, 54 is provided adjacent to the mounting position of the film pressing block 2. The sprocket roller 52 is rotatably supported by supporting members 72 and 73 made of an elastic body, and the sprocket roller 54 is rotatably supported by the supporting members 74 and 75.

Since the sprocket roller 52 and the sprocket roller 54 have the same mounting structure, the sprocket roller 52 will be described here. As in the case of the support members 42 and 44 of the film pressing block 2, the support members 72 and 73 also have holes 72b and 73b and openings 72a and 73.
a. The inner diameters of the holes 72b and 73b are set slightly larger than the support shaft 52a of the sprocket roller 52, and the openings 72a and 73a are set slightly smaller than the support shaft 52a. Therefore, the support shaft 52 of the sprocket roller 52 is
When a is pushed into the hole 72b, the sprocket roller 52 is rotatably supported by the hole 72b. The sprocket roller pairs 52 and 54 contact the film so that the perforations of the film 1 do not come off from the teeth of the film winding sprocket 110 when the back cover is closed.

In the present embodiment, the plate 10 and the contact roller 28 are formed as separate members, but the present invention is not limited to this, and the contact member integrally formed with the plate 10 can rotate. Without making a sliding contact with film 1,
The film 1 may be pressed against the take-up spool 100.

[0018]

As described above, according to the present invention,
The film pressing block, the plate, the contact roller,
By using a compression / torsion spring,
The number of parts has been reduced, and the film pressing block can be stored as a single unit. Further, since the contact roller and the compression / torsion spring can be easily attached to the plate, the assembling work is simplified. Further, since a leaf spring that is easily deformed is not used, there is no fear of deformation due to an erroneous operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing a camera according to the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a front view showing an embodiment of the present invention.

FIG. 4 is a plan view showing an embodiment of the present invention.

FIG. 5 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

1 Film 2 Film Holding Block 10 Plate 11 Stopper Part 12, 14 Shaft Part 18 Opening Part 22, 24 Boss Part 26 Compression / Torsion Spring 28 Contact Roller 29 Support Shaft 32, 34 Roller Support Part 32a, 34a Opening Part 32b, 34b Holes 42, 44 Support members 42a, 44a Openings 42b, 44b Holes 52, 54 Sprocket roller pairs 52a, 54a Support shafts 72, 73, 74, 75 Support members 80 Spring contact members 100 Winding spools 110 Winding sprockets

Claims (6)

[Claims] 1. A film pressing block provided on a back cover of a camera for pressing a film of a camera onto a take-up spool, comprising: a plate having an abutting member for abutting the film at a tip portion; and a pair of end faces facing each other. A pair of projecting support shafts, an opening formed between the pair of support shafts of the plate, a pair of bosses projecting from a pair of end faces facing the opening, and a pair of bosses. Supported compression and torsion springs,
The pair of support shafts are rotatably supported by a pair of support members formed on the back cover of the camera, the compression / torsion spring is the plate, and the contact member of the plate is the film. A film pressing block, wherein the film pressing block is urged in a direction in which the film is pressed against the take-up spool. 2. The film pressing block according to claim 1, wherein the boss is formed integrally with the plate. 3. The film pressing block according to claim 1, wherein the support shaft is formed integrally with the plate. 4. The film pressing block according to claim 1, wherein an interval between the pair of bosses is set shorter than a natural compression length of the compression / torsion spring. 5. The contact member is a roller rotatably supported by the plate.
Film retainer block described in. 6. The film pressing block according to claim 1, wherein the contact member is integrally formed with the plate.