JPH09222667A - Film running device and film guide roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a film surface from being scratched by rubbing, transferring impression or involving dust in the case of tensioning the film surface with specified pressure. SOLUTION: This device is provided with a cylinder part 24 constituted by closing one aperture end and having plural passages communicating with the inside on a turning surface consisting of a peripheral side surface; a film guide roller 22 composed of a shaft part inserted in the cylinder part 24 from the other end of the cylinder part 24 and pivotally and turnably supporting the cylinder part 24 through a bearing 27, and a hermetically sealing member hermetically sealing the other end, and a fluid supply means connected to the roller 22. Then, specified fluid is outputted from the turning surface of the roller 22 so as to form a fluid layer between the turning surface and the film 5. Thus, the film 5 is tensioned in a state where the roller 22 does not come in contact with the film, and the dust is blown off with the pressure of the fluid, whereby the dust is prevented from adhering to the film 5.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. TECHNICAL FIELD OF THE INVENTION Conventional Technology (FIG. 5) Problem to be Solved by the Invention Means for Solving the Problems Embodiments of the Invention (1) Overall Configuration (FIG. 1) (2) Film Guide Roller and Pneumatic Control System configuration (FIGS. 2 to 4) (3) Operation and effect Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film running device and a film guide roller, and is suitable for application to, for example, a projector.

[0003]

2. Description of the Related Art Conventionally, in a projector, the film is intermittently driven, for example, at 24 frames per second, and each frame on the film is irradiated with light source light at a position where the film is stopped, so that the film is projected on the film. The recorded frame images are sequentially projected on the screen.

In FIG. 5, reference numeral 1 denotes a projector as a whole, and a movie film 5 is driven to run from the film supply reel 2 side to the film take-up reel 4 side through the housing 3. The film supply reel 2 is wound with a movie film 5, and the movie film 5 is housed in the housing 3.
To send out and supply. A film guide roller 6 is pressed against the movie film 5 supplied into the housing 3. The film guide roller 6 has a cylindrical portion and a flange portion, and the roller surface of the cylindrical portion that abuts the film surface of the movie film 5 is rotatably supported. The film guide roller 6 presses the roller surface of the cylindrical portion against the film surface of the movie film 5 to add a predetermined tension to eliminate slack and the like.
To send out. The supply side sprocket 7 has a gear shape,
The movie film 5 is made to run at a constant speed at a predetermined speed by driving at a predetermined rotation speed while fitting teeth into guide holes (not shown) provided at both ends of the movie film 5. The supply-side sprocket 7 sends the movie film 5 to be run at a predetermined speed to the film trap section 8.

The film trap portion 8 is a film film 5
By limiting the position by sandwiching, the image frames of the frame images recorded on the movie film 5 are aligned. The projection unit 9 irradiates the movie film 5 thus aligned with the light source light emitted from the light source 10 via the condenser optical system 11. The flickering blade 12 provided between the film trap section 8 and the projection section 9 performs a shutter operation in synchronization with the frame feed speed of the movie film 5. As a result, the fritker blade 12
The light source light emitted from the projection unit 9 is intermittently shielded, and only when each frame image of the movie film 5 is on the optical axis of the light source light, the light source light is irradiated onto the movie film 5 without being blocked. Let In this way, the light source light radiated on the movie film 5 is
Image light is formed of each image transmitted through the movie film 5 and recorded on the movie film 5. The formed image light is passed through the projection optical system 13 to a screen (not shown).
Projected enlarged. In this way, the image recorded in the movie film 5 is projected on the screen.

The movie film 5 on which an image recorded by the emitted light from the light source is projected on the screen is sent to the film take-up reel 4 side by the frame feed sprocket 14 and the take-up side sprocket 15 to be wound up. . Here, frame feed sprocket 14 and winding side sprocket 1
An audio reproducing unit 16 is provided between the audio reproducing unit 5 and the audio reproducing unit 5.
The movie film 5 sent to the audio reproduction section 16 is
A tension of a predetermined pressure is applied by the film guide roller 17. The film guide roller 17 has a cylindrical portion and a flange portion, and the roller surface of the cylindrical portion that contacts the film surface of the movie film 5 is rotatably supported. The film guide roller 17 pushes the roller surface of the cylindrical portion against the film surface of the movie film 5 to send tension to the take-up sprocket 15 in a state in which tension of a predetermined pressure is added to eliminate slack. Further, by adding a tension of a predetermined pressure by the film guide roller 17, the movie film 5 is pressed against the reproducing section guide 18 and its position is regulated. The light source 19 irradiates the movie film 5 pressed against the reproducing section guide 18 with light source light. The light receiving element 20 reproduces the audio signal recorded in the movie film 5 by receiving the light source light that is emitted to and transmitted through the movie film 5.

Thus, the projector 1 can reproduce the image recorded in the movie film 5 and project it on the screen, and can also reproduce the audio signal recorded in the movie film 5 in the same manner.

[0008]

By the way, in the projector 1 having such a structure, the film guide rollers 6 and 17 are provided.
Therefore, the tension of a predetermined pressure is added to the movie film 5 so that the running movie film 5 is not loosened. However, since the roller surfaces of the film guide rollers 6 and 17 are pressed against the running movie film 5 as described above, there is a possibility that the movie film 5 is scratched by friction with the movie film 5 or the like.

First, the movie film 5 may slip on the roller surface which abuts against the film guide rollers 6 and 17 during its running. There is a problem of scratches.
Secondly, due to the tension added to the movie film 5, there is a problem that scratches and the like existing on the roller surfaces of the film guide rollers 6 and 17 are transferred to the film surface as indentations and become scratches. Thirdly, dust generated by the components in the projector 1 and dust floating in the apparatus, as well as dust caused by running abrasion of the roller surfaces of the film guide rollers 6 and 17 by the movie film 5, is generated between the film surfaces. There is a problem in that the film is caught in the film and scratches the film surface. In this case, even if scratches or the like do not occur, normal reproduction cannot be performed simply because dust or the like adheres to the film surface.

When these problems occur, the images and sounds recorded on the movie film 5 cannot be reproduced normally. In addition, the occurrence of such scratches leads to deterioration of the recording surface of the movie film 5, leading to a reduction in the number of times of screening and a shortening of the life of the movie film 5.

In order to avoid these problems, the roller surfaces of the film guide rollers 6 and 17 are required to have extremely high surface accuracy. However, the finish such as variation in processing accuracy and variation in molding, scratches caused by handling and scratches caused by friction during traveling,
Furthermore, it is difficult to maintain perfect surface accuracy due to scratches and the like caused by the attachment of dust and the like.

The film guide rollers 6 and 17 are
The roller surface of the cylindrical portion is finished with high accuracy by providing a nipping portion so as not to leave a fillet portion that causes unstable running or deformation of the movie film 5. However, in this case, the nig edge portions are concentrated and pressed against the film surface, and the problem of scratching the film surface due to scratching or indentation cannot be solved. Therefore, it is considered that the roller surface is finished with high precision and easily by eliminating the nig portion and forming the cylindrical portion and the flange portion separately. However, in this case, the maintenance work and the like becomes complicated due to the increase in the number of parts, and the problem that it is difficult to maintain the surface accuracy of the roller surface due to the factors described above cannot be solved.

The present invention has been made in consideration of the above points, and prevents film scratches caused by scratching, impression transfer, or dust entrapment when a tension of a predetermined pressure is applied to the film surface. It is intended to propose a device and a film guide roller.

[0014]

In order to solve the above problems, according to the present invention, one opening end is closed, and a cylindrical portion having a plurality of flow paths communicating with the inside is formed on a rotating surface which is a peripheral side surface. And a film guide roller including a shaft portion that is inserted into the cylindrical portion from the other end portion of the cylindrical portion and rotatably supports the cylindrical portion via a bearing, and a sealing member that seals the other end portion. , A fluid supply means connected to the film guide roller.

By outputting a predetermined fluid from the rotating surface of the film guide roller to form a fluid layer between the rotating surface and the film, tension can be added to the film without contacting the film guide roller. At the same time, it is possible to prevent dust from adhering to the film by blowing off the dust by the pressure of the fluid.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

(1) Overall Structure FIG. 1 in which parts corresponding to those in FIG. 5 are designated by the same reference numerals shows a projector 21 as a whole, and film guide rollers 22 and 23 for applying a predetermined pressure tension to the movie film 5. Except for this, the projector 1 has the same configuration as that of the projector 1 in FIG. That is, the projector 21 drives and runs the movie film 5 from the film supply reel 2 side to the film take-up reel 4 side through the housing 3. The film guide roller 22 provided in the housing 3 sends the film film 5 supplied from the film supply reel 2 to the supply side sprocket 7 in a state where tension of a predetermined pressure is added to eliminate the slack. The supply-side sprocket 7 has a gear shape, and the movie film 5 is driven at a predetermined rotation speed while fitting teeth in guide holes (not shown) provided at both ends of the movie film 5. Run at a constant speed,
It is sent to the film trap section 8.

The film trap section 8 is a film film 5
By limiting the position by sandwiching, the image frames of the frame images recorded on the movie film 5 are aligned. The projection unit 9 irradiates the movie film 5 thus aligned with the light source light emitted from the light source 10 via the condenser optical system 11. Fritker blade 1 provided between the film trap section 8 and the projection section 9
Reference numeral 2 indicates that each frame image of the movie film 5 is on the optical axis of the light source light by intermittently blocking the light source light emitted from the projection section 9 by performing a shutter operation in synchronization with the frame feed speed of the movie film 5. Only when you come to the movie film 5
Irradiate on top. The light source light radiated on the movie film 5 in this way passes through the movie film 5 and
Form image light consisting of each image recorded above. The formed image light is enlarged and projected on a screen (not shown) via the projection optical system 13, and the image recorded in the movie film 5 is projected on the screen.

The movie film 5 on which an image recorded by the emitted light from the light source is projected on the screen is sent to the film take-up reel 4 side by the frame feed sprocket 14 and the take-up side sprocket 15, and is taken up. . Also, the frame feed sprocket 14 and the winding side sprocket 15
An audio reproducing unit 16 is provided between the audio recording medium and the audio recording medium, and reproduces the audio signal recorded in the movie film 5. The film guide roller 2 provided in the audio reproducing section 16
3 sends the film film 5 to the take-up side sprocket 15 in a state where tension of a predetermined pressure is applied to the film film 5 so as to eliminate slack and the like, and presses the film film 5 against the reproducing section guide 18 to regulate the position. The light source 19 is the reproduction unit guide 1.
The light source light is applied to the movie film 5 pressed against the film 8. The light receiving element 20 reproduces the audio signal recorded in the movie film 5 by receiving the light source light that is emitted to and transmitted through the movie film 5.

(2) Construction of Film Guide Roller and Pneumatic Control System The film guide rollers 22 and 23 are composed of a cylindrical roller portion and a shaft portion rotatably supporting the roller portion. The film guide rollers 22 and 23 are
The axially supported roller portion is pressed against the film surface of the movie film 5 to add a tension of a predetermined pressure, and the air flow supplied from the pneumatic control system connected to the axial portion is passed around the roller portion via the axial portion. Let it blow out from the side. The structure of the film guide roller 22 is shown below. Since the film guide roller 23 has the same structure as the film guide roller 22, the description thereof will be omitted.

In the film guide roller 22 shown in FIG. 2, stepped flange portions 25 corresponding to the width of the movie film 5 are provided at both ends of a cylindrical portion 24 whose one open end is closed. . A predetermined number of circular through holes 26 having a diameter of about 1 [mm] are formed in the region between the opposing flange portions 25 on the peripheral side surface of the cylindrical portion 24. Further, the cylindrical portion 24 has bearings 27 at both ends of the internal space, and a rotary seal portion 28 made of a rubber O-ring is provided in the internal space on the other open end side. Further, the inward surface side of each flange portion 25 is formed so that a part thereof is tapered outward toward the outer periphery in order to prevent abrasion of the movie film 5 due to an edge and a stable film guide (not shown). No).

The hollow shaft 29 inserted into the inside of the cylindrical portion 24 from the other opening has a circular tubular shape with the end portion on the insertion side being closed, and by engagement with the bearing 27, the cylindrical portion 24 is rotatably supported. The other open end of the cylindrical portion 24 on the side where the hollow shaft 29 is inserted is sealed by a rotary seal portion 28. On the peripheral side surface of the hollow shaft 29, a predetermined number of through holes 30 having a diameter of about 2 [mm] are formed in a region inserted into the cylindrical portion 24 ahead of the rotary seal portion 28. The hollow shaft 29 has a rear intermediate portion attached to a tension arm 31, and a rear end portion thereof connected to one end portion of a flexible air introduction passage 32 made of nylon tube piping material. The other end of the air introduction path 32 is connected to an air delivery device 33, which is a compressor, and introduces the air delivered from the air delivery device 33 into the hollow shaft 29.

Here, as shown in FIG. 3, the tension arm 31 to which the hollow shaft 29 is attached is an arm portion having a predetermined length. The tension arm 31 is used for the projector 21.
It is rotatably supported by a shaft 34 press-fitted and fixed in a predetermined housing position (FIG. 1). As a result, the rotation of the tension arm 31 causes the hollow shaft 29 mounted at a position separated from the shaft 34 by a predetermined distance to move to the cylindrical portion 24.
Move with. Therefore, by rotating the tension arm 31 in the direction of the arrow shown in the drawing, the entire film guide roller 22 can be moved, and thus a predetermined amount of tension can be added to the movie film 5.

FIG. 4 shows an air pressure control system for supplying air from the air delivery device 33 to the film guide roller 22. The air delivery device 33 is a compressor, and is connected to the hollow shaft 29 in the film guide roller 22 via an air introduction path 32. The air supplied from the air delivery device 33 is set to a predetermined air pressure by the primary side pressure valve 35 and the secondary side pressure valve 36, and the supply amount is controlled to a required flow rate by the flow rate control valve 37. And is introduced into the hollow shaft 29. Here, a pressure detector 38 is arranged in the air introduction passage 32 connected to the hollow shaft 29. The pressure detector 38 detects the air pressure in the hollow shaft 29 and gives the detection result to the pressure detection circuit 39. The pressure detection circuit 39 compares the detection result with a preset air pressure, and notifies the control circuit 40 of the comparison result. The control circuit 40 controls the flow rate control valve 37 based on the notified comparison result to adjust the flow rate of the supplied air.

(3) Operation and Effect In the above-mentioned structure, the film guide rollers 22 and 23 provided in the projector 21 are sealed by the hollow shaft 29 and the rotary seal portion 28, and rotated via the bearing 27. It is freely pivoted (Fig. 2). The film guide rollers 22 and 23 are pressed against the movie film 5 (FIG. 1) in such a supported state,
The cylinder portion 24 and the flange portion 25 regulate the film position to guide the traveling.

At this time, the film guide rollers 22 and 2
3 outputs the air having a predetermined pressure supplied from the air delivery device 33 into the hollow shaft 29 from the through hole 26 via the through hole 30. The output air forms an air layer between the cylindrical portion 24 and the movie film 5. As a result, direct contact between the movie film 5 and the film guide rollers 22 and 23 can be suppressed, and dust can be blown off by air pressure to prevent the dust from being caught and attached to the film surface. Thus, the film guide rollers 22 and 2
It is possible to prevent film scratches due to the shape, scratches, dust inclusion, adhesion to the film surface, and the like.

The film guide rollers 22 and 23 are also provided.
In this way, since the tension can be added to the film surface of the movie film 5 in a state of non-contact with the film surface, there is no need to require a highly accurate surface accuracy for the rotating surface of the cylindrical portion 24, and processing and handling can be facilitated. . In this case, maintenance of surface accuracy can be easily achieved.

According to the above structure, the cylindrical portion 24, which has one opening end closed and which has a plurality of through holes 26 communicating inwardly on the roller surface which is the peripheral side surface, and the cylindrical portion 24.
The film guide rollers 22 and 23, which are inserted from the other end of the film and have a hollow shaft 29 that rotatably supports the cylindrical portion 24 via a bearing 27, are provided, and the film guide rollers 22 and 23 are provided with air. The air supply device 33 for supplying the air is supplied so that the air supplied from the air supply device 33 is output from the roller surfaces of the film guide rollers 22 and 23, and the roller surfaces of the film guide rollers 22 and 23 and the movie film 5 are separated from each other. An air layer is formed between them. Thereby, the film guide rollers 22 and 23
A tension can be added to the movie film 5 in a non-contact state with the movie film 5, and dust can be prevented from adhering to the movie film 5 by blowing off the dust by the pressure of the air. Thus, the movie film 5 can be prevented. It is possible to realize the projector 21 that prevents scratches caused by rubbing, indentation transfer, or dust entrapment when a tension of a predetermined pressure is applied to the film surface.

In the above embodiment, the projector 21
The present invention is not limited to this, but the present invention is not limited to this, and if it is a device that runs a belt-shaped film or tape while adding a tension of a predetermined pressure, it is like a video tape recorder or a movie film recording device. It may be applied to other devices.

In the above embodiment, the cylindrical portion 24
An air introduction path 32 is connected to a hollow shaft 29 that rotatably supports the air, and air supplied from an air delivery device 33 is introduced into a void in the hollow shaft 29, and a through hole 30 provided in the hollow shaft 29 is provided. Although the case where the air is delivered from the cylindrical portion 24 to the hollow shaft 29 is described above, the present invention is not limited to this, and the tip portion inserted into the cylindrical portion is opened without being blocked and air is discharged from this opening portion. You may make it provide the hollow shaft which can be sent out in the space between a cylindrical part and a hollow shaft. That is, any structure may be used as long as it can supply the air supplied to the hollow shaft to the space between the cylindrical portion and the hollow shaft.

Further, in the above-described embodiment, the cylindrical portion 24 having the rotating surfaces of the film guide rollers 22 and 23.
Although the case where a plurality of through holes 26 are provided to output air has been described above, the present invention is not limited to this, and for example, it is possible to ventilate from the inside of a sintered metal, ceramics, or a mesh material having a coarse bond to the front side. By using a member,
A cylindrical portion that can output air may be provided without providing a through hole.

Further, in the above-described embodiment, the cylindrical portion 24 and the hollow shaft 29 of the film guide rollers 22 and 23 are used.
Although the case where the circular through holes 26 and 30 are provided has been described above, the present invention is not limited to this, and the through holes having other shapes such as a slit shape may be provided.

Further, in the above embodiment, the hollow shaft 29
In the above description, the film guide rollers 22 and 23 are also used as the axis support and the air introduction, but the present invention is not limited to this, and the axis support and the air introduction may be performed in different configurations. For example, the shaft of the film guide roller is supported by a solid shaft, and air is introduced into the film guide roller by connecting an air introduction path that can be rotated flexibly.

Further, in the above-mentioned embodiment, the case where the flange portions 25 are arranged so as to face inwardly at both ends of the cylindrical portion 24 of the film guide rollers 22 and 23 has been described, but the present invention is not limited to this. Alternatively, only one side may be provided.

Further, in the above-mentioned embodiment, the case where the compressor is used as the air delivery device 33 has been described, but the present invention is not limited to this and, for example, an air cylinder or a blower device may be used.

In the above embodiment, the case where the air is outputted from the film guide rollers 22 and 23 to form the air layer between the film guide roller 22 and the film film 5 has been described.
The present invention is not limited to this, and a gas or liquid other than air such as an inert gas that does not affect the movie film may be output.

[0037]

As described above, according to the present invention, one opening end is closed, and a cylindrical portion having a plurality of flow passages communicating inwardly on a rotating surface which is a peripheral side surface, and a cylindrical portion. A film guide roller is provided which includes a shaft portion that is inserted into the cylindrical portion from the other end and rotatably supports the cylindrical portion via a bearing, and a film guide roller that includes a sealing member that seals the other end portion. And a fluid supply unit connected to the film supply unit, and a predetermined fluid supplied from the fluid supply unit is output from the rotating surface of the film guide roller to form a fluid layer between the rotating surface and the film. The tension can be added to the film without the guide roller in contact with it, and the dust can be blown off by the pressure of the fluid to prevent the dust from adhering to the film. It is possible to realize a film traveling device and the film guide rollers to prevent the occurrence of scratches caused Te cowpea to abrasion, entrainment indentation transcription or dust when added Nshiyon.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a projector according to an embodiment.

FIG. 2 is a side view showing a configuration of a film guide roller according to an embodiment.

FIG. 3 is a front view used for explaining addition of tension to a film by a film guide roller.

FIG. 4 is a block diagram showing the configuration of a pneumatic control system.

FIG. 5 is a side view showing the configuration of a conventional projector.

[Explanation of symbols]

1, 21 ... Projector, 2 ... Film supply reel, 3 ...
... Case 4 ... Film take-up reel 5 ... Movie film, 6,17,22,23 ... Film guide roller, 7 ... Supply side sprocket, 8 ... Film trap section, 9 ... Projection Section, 10, 19 ... Light source, 11 ... Condenser optical system, 12 ... Fritker blade, 13 ...
… Projection optics, 14 …… Frame feed sprocket, 15 ……
Winding side sprocket, 16 ... Audio playback unit, 1
8 ... Playback section guide, 20 ... Light receiving element, 24 ... Cylindrical section, 25 ... Flange section, 26, 30 ... Through hole, 27
...... Bearing, 28 ...... Rotary seal part, 29 ...... Hollow shaft, 31 ...... Tension arm, 32 ...... Air introduction path,
33 ... Air delivery device, 34 ... Shaft, 35 ... Primary pressure valve, 36 ... Secondary pressure valve, 37 ... Flow control valve, 3
8 ... Pressure detector, 39 ... Pressure detection circuit, 40 ... Control circuit.

Claims (8)

[Claims] 1. A film running device for running a strip-shaped film or tape while applying a tension of a predetermined pressure by the film guide roller, wherein one opening end of the film guide roller is closed. A cylindrical portion having a plurality of flow passages communicating inwardly on a rotating surface formed of a peripheral side surface, and inserted into the cylindrical portion from the other end of the cylindrical portion,
It is composed of a shaft portion that rotatably supports the cylindrical portion via a bearing and a sealing member that seals the other end portion, and is supplied from a fluid supply means connected to the film guide roller. A film running device characterized in that the fluid is introduced into a space between the cylindrical portion and the shaft portion and is output from the flow path to add the tension of the predetermined pressure to the film or tape. 2. The shaft portion has a void therein, and a through hole on the peripheral side surface for connecting the void to the outside of the shaft portion, and is obtained from the fluid supply means connected to the shaft portion. The film traveling apparatus according to claim 1, wherein a fluid is introduced into the space between the cylindrical portion and the shaft portion through the gap and the through hole in order. 3. The film running device according to claim 1, wherein the cylindrical portion has a stepped portion having a flange shape on the rotation surface facing the film or tape. 4. The film traveling apparatus according to claim 1, wherein the fluid is gas or liquid having a predetermined pressure. 5. A film guide roller adapted to apply tension of a predetermined pressure to a belt-shaped film or tape, wherein one opening end of the film guide roller is closed, and the film guide roller is provided with a circumferential side surface. A cylindrical portion having a plurality of flow paths communicating with the inside on the moving surface, and inserted into the cylindrical portion from the other end of the cylindrical portion,
It is composed of a shaft portion that rotatably supports the cylindrical portion via a bearing and a sealing member that seals the other end portion, and is supplied from a fluid supply means connected to the film guide roller. A film guide roller, wherein a tension of a predetermined pressure is added to the film or tape by introducing a fluid into a space between the cylindrical portion and the shaft portion and outputting the fluid from the flow path. 6. The shaft portion has a void inside and a through hole on the peripheral side surface for connecting the void to the outside of the shaft portion, and is obtained from the fluid supply means connected to the shaft portion. The film guide roller according to claim 5, wherein a fluid is introduced into the space between the cylindrical portion and the shaft portion through the gap and the through hole in sequence. 7. The film guide roller according to claim 5, wherein the cylindrical portion has a flange-shaped step portion on the rotation surface facing the film or tape. 8. The film guide roller according to claim 5, wherein the fluid is gas or liquid having a predetermined pressure.