JPH0310510Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a film transport device in a photographic film processing machine for developing or otherwise processing a long film.

(Prior Art) In an automatic processor for automatically developing a long length of exposed photographic film, the length of film is sequentially guided through a developing tank, a fixing tank, a washing tank, a drying device, etc. for processing. In order to do this, the long film is guided into each of these tanks and the drying device by a conveying device composed of a drive roller driven by a motor and a guide roller that rotates in conjunction with the drive roller. .

In an automatic developing machine using such a film transport device, it is necessary to remove the slack that occurs when loading the film into the transport device, and the expansion and contraction of the film material that occurs due to heating temperatures in various processing steps. Therefore, a method is used in which the film is conveyed in the direction in which the film is pulled out from the film discharge end, while removing the slack and applying an appropriate tensile force to prevent the film from being cut.

However, in a film transport device of a known structure that includes a film transport path in cooperation with a freely rotating guide roller and a plurality of drive rollers for transporting the film in the forward direction, each drive roller simultaneously The drive rollers are connected to the same drive shaft via a mechanical rotation transmission mechanism so as to rotate in conjunction with each other in the film transport direction.
Therefore, it is not possible to remove the slack in the film between each drive roller using only the tensile force obtained by applying tension to the loaded film on the discharge side.
Also, if the film is pulled too hard to remove slack, the film may slip on the drive roller, causing
There is a risk that the film may be damaged, the rotation transmission system of the drive roller may be destroyed, or the film rack itself may float up.

In particular, in the case of a drive roller in which a film is wrapped around one-sixth or more of the outer circumference of the drive roller, if the film slips, the film and the drive roller may slip. Since the contact area is large, the film is easily damaged, and this tendency increases as the wrapped portion of the film becomes larger relative to the outer peripheral length of the drive roller. Conversely, if the contact area of the film is small relative to the outer circumferential length of the drive roller, the influence of slip is relatively small.

To prevent this, for example, Japanese Patent Application Laid-Open No. 58-10739
In the method described in the publication, when the moving speed of the photographic film exceeds the circumferential speed of the roller, the common drive shaft of a plurality of transport rollers (corresponding to the drive roller in this invention) is connected to the drive device on the discharge side. The mechanism is such that the film is transferred by rotating freely according to the tensile force of the film. Furthermore, Japanese Utility Model Publication No. 58-88633 discloses that a one-way clutch is interposed between the drive device of the film transport device and the drive shaft for simultaneously driving a plurality of transport rollers, so that all A film conveying device is shown in which the rollers are configured to freely rotate only in the film conveying direction at the same time.

(Problems to be Solved by the Invention) In any of the film transport devices in the conventional photographic film processing machines described above, the transport rollers between each processing step in the processing process are mechanically coupled to rotate in conjunction with each other. Therefore, these conveying rollers rotate simultaneously in one direction of the tension according to the tension and at the same circumferential speed.

Therefore, even if it is possible to remove the slack in the film that occurs in the film transport path between each processing step, it is not possible to remove the slack between the transport rollers in the same processing section. Also, if the tension is increased in an attempt to forcibly remove this slack, the conveying roller may slip on the film surface and damage the film surface.
There was a risk of damage to the drive system for interlocking rotation of gears, etc.

Furthermore, since the conveyance rollers are mechanically coupled to rotate in conjunction with each other, it is necessary to use a relatively large tensile force to remove slack.

(Means for Solving the Problems) In order to solve the problems of the conventional film transporting device of this type as described above, the film transporting device of the photographic film processing machine of this invention is engaged with a common drive shaft. In a film transporting device for a photographic film processing machine configured to transport a film in a film rack having a plurality of rotating drive rollers through a transport path, a drive shaft and a drive roller are connected to each rotation shaft. a one-way clutch for coupling together, the one-way clutch comprising a first rotating member, a second rotating member, and a coil spring coupling the first and second rotating members;
The first rotating member includes a sprocket that engages with and rotates the drive shaft, and a first cylindrical portion provided on the sprocket and coaxial with the rotation center axis thereof, and the second rotating member includes a sprocket that rotates by engaging with the drive shaft. a collar that engages with the rotational axis of the coil spring; and a second cylindrical part provided on the collar and coaxial with the rotation center axis of the collar, the first and second cylindrical parts being inserted into the coil spring. The present invention is characterized by having a coil spring that faces each other and has both ends fixed to the first rotating member and the second rotating member.

(Function) According to the configuration of this invention, one end of the coil spring constituting the one-way clutch is fixed to the sprocket, and the other end is fixed to the collar, so that the rotational speed of the first rotating member on the sprocket side is fixed. is faster than the rotational speed of the second rotating member, the coil spring acts to tighten the first cylindrical portion and the second cylindrical portion, so that the first and second rotating members rotate simultaneously. On the other hand, if the second rotating member rotates at a faster rotation speed than the first rotating member due to the tension of the film, the winding direction of the coil spring will loosen, and this loosening will cause the second rotating member to move in the steady direction. It will rotate quickly and freely. Therefore, a plurality of drive rollers forming a film conveying path in one processing step such as developing, fixing, water washing, or drying in a photographic film processing machine are each driven by a drive device that drives these drive rollers. Since they are engaged via the one-way clutch of the above-described construction, each drive roller can be freely rotated independently with respect to the normal transport direction of the film.

Therefore, when a film is pulled in the ejection direction to remove slack from the film, at least within the same processing step (within the same film rack), multiple driving rollers independently and freely apply the pulling force. Since it rotates in the tension direction at a circumferential speed corresponding to the
It can be almost completely removed without damaging the film or the drive system gears, and in that case, the strength of the tensile force can be relatively weak.

In addition, if a drive device is provided for each processing step for the film transport path between each processing step, by applying this idea to each processing step, it will be easier to prevent the film from sagging between each processing step. It is possible to remove it.

The clutch of this invention has six points on the outer periphery of the drive roller.
This is particularly effective when the present invention is attached to a plurality of drive rollers around which a film to be conveyed over one-quarter or more, especially one-fourth or more, is wound around, such as a film U-turn roller of a film rack.

(Embodiment) FIG. 2 is a schematic diagram showing the main parts of a black and white photographic film automatic developing machine to which the film conveying device of this invention is applied.

1 is a fully developed film insertion section, 2 is a film detection section, 3 is a development processing section, 4 is a fixing processing section, 5 is a washing processing section, 6 is a squeeze section, 7 is a drying processing section, 8 is a film receiving box, 9 is a drying fan, 10 is a duct,
11 is a guide, 12 is a casing, and 13 is a long film.

In the illustrated example, this invention is implemented in each film transporting device in the developing processing section 3, the fixing processing section 4, and the water washing processing section 5.

That is, in each of these processing units 3, 4, 5, a rotation transmission system, for example, a chain 17, 18, 19, is connected by a common drive shaft 14, 15, 16, respectively.
drive rollers (a plurality of rollers are provided in each processing section, and are representatively shown as 3a, 4a, and 5a), which are rotationally driven via There are multiple units installed in each processing unit, but three are representative of each unit.
b, 4b, 5b) to form a transport path, and each drive shaft 14, 15, 1
By rotating the film 13, the film 13 is transferred in the direction of the arrow a in a steady state.

Since the configurations of the embodiments in each of these processing sections 4, 5, and 6 are completely the same, the description of this embodiment will be replaced by taking the development processing section 3 as an example.

FIG. 1 is an external view showing an example of the configuration of a film transport device within the developing processing section 3. As shown in FIG. In Figure 1,
Each of the driving rollers 20 to 26 is configured to nip the long film 13 in cooperation with guide rollers 27 to 33 which freely rotate in contact with each other, and transport the long film 13 in the direction of arrow a in a steady state. Reference numeral 34 denotes a drive shaft which is rotated by a rotary drive device (not shown), such as a motor, and rotates each drive roller at once, and includes a first sprocket 35 fixed to this drive shaft 34, and each drive roller. Each second sprocket 3 is engaged with a rotating shaft of each of the drive rollers 20 to 26 and is arranged to rotationally drive each of the drive rollers 20 to 26 via a one-way clutch constructed as described below.
6 to 42, and an endless chain 43 (partially shown in phantom lines) that is engaged with and suspended from the first sprocket 35 and all the second sprockets 36 to 42 in order to rotate the first and second sprockets in conjunction with each other.
The rotation transmission mechanism is constructed by the following. Additionally, one-way clutches 44-50 are provided between each second sprocket 36-42 and the corresponding rotation shaft of each drive roller 20-26 to allow each drive roller 20-26 to freely rotate only in the forward direction. Each is inserted.

In this embodiment, the one-way clutch is constructed integrally with the second sprocket so that the axial dimensions of the drive rollers 20-26 are approximately equal to those of the prior art.

FIG. 3 shows an example of the structure of a one-way clutch. In this example, the one-way clutch is
It is composed of a rotating member 61, a second rotating member 62, and a coil spring 63 that connects these two members, and a one-way clutch and a sprocket 64 are integrated. That is, the first rotating member 61
is formed integrally with a sprocket 64 that engages with a drive chain (not shown) to rotate, and at the center of rotation is a support hole 65 (the cross section of which is shown on the left side of the figure) which is rotatably supported on a support shaft (not shown). shape)
is installed. The first rotating member 61 also includes a first cylindrical portion 59 that is coaxial with the rotational center axis of the first rotating member 61.
is provided. The second rotating member 62 has a collar portion 66
It has a rotary shaft engaging hole 68 having a notch 67 on the side surface for engaging with a rotary shaft of a drive roller (not shown), and further has a first cylindrical portion coaxial with the central axis of rotation thereof. The second cylindrical part 60 with the same diameter as
have. Each of these rotating members 61 and 62 is inserted into each cylindrical portion 5 within a coil spring 63 as shown in the figure.
9 and 60 to face each other, and the coil spring 6
In order to apply a force in the direction of compressing and urging 3,
A second rotating member 62 having a flange portion 66 is connected to a rotating shaft of a driving roller and a sprocket 6 which is appropriately held.
It is used in a form inserted between 4 and 4. The coil spring 63 is wound in the direction in which the coil spring 63 is wound when the rotation speed of the sprocket 64 is equal to or faster than the steady rotation speed of the drive roller, and vice versa. Attach in the direction that it will loosen.

By using the sprocket with the one-way clutch integrated in the structure as described above, the coil spring 6
3 are fixedly held by both sides of the sprocket 64 and the flange 66, so that the rotational speed of the first rotating member 61 on the sprocket 64 side is the same as that of the second rotating member 61.
If the rotation speed is faster than the rotation speed of the rotating member 62, the spring 6
3 is tightly wound so as to tighten the respective cylindrical portions 59 and 60 of both members 61 and 62. Therefore, the two rotating members 61 and 62 are fixed. Therefore, both of them are strongly connected and rotate at the same time, so that each drive roller rotates normally by the driving force of the drive device.

On the other hand, the first rotating member 61 on the sprocket 64 side
a second rotating member 62 that engages the drive roller.
If the coil spring 63 tries to rotate faster due to the tension of the film 13, the winding direction of the coil spring 63 becomes loose, so that the second rotating member 62 can rotate quickly and freely in the steady direction. Therefore, by inserting such a one-way clutch into the rotating shafts of a plurality of drive rollers, the slack in the film that occurs between each drive roller can be easily removed without damaging the film or the rotation transmission system. I can do it.

For example, with the film 13 being held between a pair of drive rollers and guide rollers, the rotation of the drive rollers 20 to 26 may transport the film 13 in the direction of arrow a at a normal speed, or may cause the film 13 to be transported at a normal speed. Suppose it is stopped. At this time, for example, if the film 13 is pulled in the forward direction, that is, in the transport direction, at a speed faster than the circumferential speed of the drive rollers 20 to 26, in order to remove the slack when the film 13 is loaded during transport, each drive roller Roller 20-2
6 rotate freely in the forward direction according to the moving speed of the film 13. Therefore, the slack in the film between each of the drive rollers 20 to 26, which has conventionally been difficult to remove, can be easily removed.

In addition, by applying this invention to all the processing sections that make up the photographic film processing machine, it becomes possible to simultaneously remove the slack in the film 13 that occurs between the processing sections easily and without strain. .

The one-way clutch of this invention uses at least one-sixth of the outer circumference of a plurality of drive rollers.
wrapped around the film being conveyed, for example, the rollers 20, 21 in FIG.
When attached to 23, 24, and 26, particularly excellent effects are exhibited.

It should be noted that the one-way clutch used in this invention is not limited to the one of the embodiments described above, and it goes without saying that modifications or changes can be made within the scope of this invention.

Next, a one-way clutch that is different in structure from the one-way clutch of this invention, but which can be used in a film transport device of a photographic film processing machine, will be described as a reference.

Fig. 4A is an exploded view showing a reference example of a structure in which the second sprockets 36 to 42 and one-way clutches 44 to 50 are integrated, and Fig. 4B is a view seen from the direction of arrow b in Fig. 4A. It is shown in a front view.

In Figures A and B, 51 corresponds to each of the second sprockets 36 to 42 previously explained with reference to Figure 1. At the center of this sprocket 51, there is a three-pronged protrusion 5 oriented in a certain direction.
A through hole 55 with holes 2, 53, and 54 provided on the inner surface is bored. On the other hand, the rotation shaft 57 of the drive roller 56
A toothed portion 58 is provided on the circumferential side of one end.
In this case, the tooth portion 58 can be inserted into the through hole 55, and the protrusions 52, 5 inside the through hole 55 can be inserted into the through hole 55.
3 and 54 to allow free rotation in only one direction as indicated by arrow c. The end on which the teeth 58 of the rotating shaft 57 of the drive roller 56 formed in this way are formed is inserted into the through hole 55 of the sprocket 51 as shown in FIG. The rotating shaft 57 is supported in a coincident manner.

By using the sprocket 51 integrated with the one-way clutch configured in this way, the drive roller 56 is rotated in the direction of the arrow d so that the end of the tooth portion 58 of the rotating shaft 57 is inserted into the through hole 55. Each protrusion 5
2, 53, and 54, and thus the drive roller 56 is rotated in the direction of arrow c at the same rotational speed as the sprocket.

However, the drive roller 5 is smaller than the sprocket 51.
6 becomes faster, the protrusions 52,
Since the engagement force of the end portion of the toothed portion 58 with respect to the teeth 53 and 54 decreases, the driving roller 56
rotates freely in the c direction at high speed.

(Effects of the Invention) As explained in detail above, the film conveying device of this invention has at least a plurality of rotating shafts of a plurality of drive rollers driven by the same drive device, and a plurality of rotation shafts of a plurality of drive rollers driven by at least one and the same drive device. Since the configuration has independent one-way clutches inserted between the rotation transmission systems to the rollers, these multiple drive rollers are pulled in the film transport direction at a circumferential speed higher than the constant speed for film transport. When the film is moved, it rotates freely in the transport direction and at an arbitrary circumferential speed depending on the film running speed. Therefore, the slack in the film that occurs between the plurality of drive rollers can be easily and reliably removed by pulling the film in the film ejection direction without applying excessive force to the film itself or the rotation transmission system. be. Further, the drive rollers are configured to be allowed to rotate freely independently only in the film steady running direction, and at least one-sixth of the roller outer circumferential length of the plurality of drive rollers is wrapped with the transported film. This idea can be effective if

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of the main parts of an embodiment of the film conveying device of this invention, and FIG. 2 is a perspective view showing an example of applying this invention to an automatic developing machine for black and white film. FIG. 3 is a cross-sectional view showing a configuration example of a one-way clutch, and FIGS. 4A and 4B are an exploded view and a front view showing a reference example of a one-way clutch. 13... Long film, 14, 15, 16...
Drive shaft, 17, 18, 19... Endless chain, 20-26... Drive roller, 27-33...
Guide roller, 34...Rotation drive shaft, 35...First sprocket, 36-42...Second sprocket, 64...Sprocket, 43...Endless chain, 44-50...One-way clutch, 59
...First cylindrical part, 60... Second cylindrical part, 61...
First rotating member, 62... Second rotating member, 63...
Coil spring, 65...Support hole, 66...Brim part,
67... Notch, 68... Rotating shaft engagement hole.

Claims (1)

[Claims for Utility Model Registration] (1) A photographic film processing machine configured so that film is transported through a film transport path of a film rack having a plurality of drive rollers that rotate while being engaged with a common drive shaft. The film conveying device includes a one-way clutch that engages a drive shaft with a rotating shaft of each of the drive rollers, the one-way clutch being connected to a first rotating member and a second rotating member.
The first rotating member includes a rotating member and a coil spring coupling the first and second rotating members, and the first rotating member includes a sprocket that engages with the drive shaft and rotates, and a sprocket provided on the sprocket. the second rotating member has a first cylindrical part coaxial with the rotational center axis of the second rotating member; a second cylindrical part having a coaxial axis, the first and second cylindrical parts are inserted into the coil spring and faced each other, and both ends are fixed to the first rotating member and the second rotating member. A film transport device for a photographic film processing machine, characterized by having a coil spring. (2) In the film transport device for a photographic film processing machine as set forth in claim 1 of the utility model registration claim,
Photographic film processing characterized in that the plurality of drive rollers each having a rotating shaft engaged with a drive shaft via a one-way clutch have the film winding portion having a length of at least one-sixth of the outer circumference of the roller. The machine's film transport device. (3) In the film transport device of a photographic film processing machine as set forth in claim 1 of the utility model registration claim,
A film transport system for a photographic film processing machine, wherein said plurality of drive rollers having a rotating shaft engaged with a drive shaft via a one-way clutch are all drive rollers in said film rack.