JP2936271B2 - Photographic photosensitive material transport device in image recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a photographic light-sensitive material conveying device in an image recording apparatus that scans light modulated based on an image signal onto a photographic light-sensitive material to record an image. About.

<Conventional technology> Conventionally, as an image recording apparatus, a light beam is modulated based on an image signal, and the modulated light beam is scanned on a photosensitive material as a recording medium, thereby developing the photosensitive material exposed to light. A known optical scanning recording apparatus is known (see, for example, JP-A-59-83150).

This will be described with reference to FIG.
Beam (laser beam) 2 emitted from the mirror 4 is converted into a parallel beam by a collimator lens 3 and then a mirror 4
After being reflected by the optical deflector 5 such as a rotary polygon mirror. The light beam 22 is reflected and deflected by the light deflector 5, passes through the converging lens 6, and scans (main-scans) the photographic photosensitive material 7 in a direction substantially perpendicular to the arrow Y direction. At the same time, the photosensitive material 7 is conveyed in the direction of the arrow Y by the conveying device 8 to perform sub-scanning. Therefore, the light beam 12 is irradiated onto the photosensitive material 7 two-dimensionally.

The light beam 2 is modulated based on an image signal output from an image signal output device, and an image carried by the image signal is placed on a photosensitive material 6 exposed to the modulated light beam. Recorded as an image.

The image signal is a digital signal, is passed through a signal converter, is converted into a signal based on a predetermined conversion table, is modulated into an analog signal by a D / A converter, and is input to a modulation circuit. The modulation circuit controls the driver of the semiconductor laser 1 based on the analog image signal, so that the light beam 2 is modulated as described above.

Further, the exposed photosensitive material 7 is then sent to a known developing machine, where it undergoes development, fixing, washing and drying.
By this processing, the photographic latent image is developed, and the image carried by the image signal is recorded on the photosensitive material 7 as a visible image.

By the way, the conveying device 8 for the photosensitive material 7 is conventionally
Driving roller 9 driven to rotate by a motor (not shown)
And a driven roller (nip roller) 10 rotating in contact with the driving roller 9, and the photosensitive material 7 sandwiched between the rollers 9, 10 is conveyed by the rotation of the rollers 9, 10.

The driving roller 9 and the driven roller 10 are each formed in a cylindrical shape, and the driving roller 9 is formed to have a larger diameter than the driven roller 10. Incidentally, the axial length of each of the rollers 9 and 10 is, for example, about 300 to 600 mm.

<Problems to be Solved by the Invention> However, in the conventional transfer device 8 including such a driving roller 9 and a driven roller 10, each of the contact pressure, processing accuracy, mounting position, and the like is as follows. Various problems based on factors have occurred.

That is, it is difficult to make the peripheral surfaces of the driving roller 9 and the driven roller 10 uniform over the entire area in the longitudinal direction of the rollers 9 and 10 in contact with each other. )reference). As a result, for example, both rollers 9, 10
Even if there is no gap between them, the contact pressure between the rollers 9, 10 becomes uneven.

This one-sided contact state causes a different amount of conveyance force to the photosensitive material 7 as an object to be conveyed on the left and right sides of the rollers 9 and 10, and thus causes a large meandering.

In addition, since a relatively long roller hardly has high processing accuracy due to run-out during processing, it is difficult to make the diameter the same over the entire length of the roller. As a result, the peripheral speed of the roller differs depending on the position in the longitudinal direction of the roller, which also causes meandering. In addition, since a relatively long roller is easy to bend and has a relatively low natural frequency, when an exciting force from a motor or an external device reaches the roller, the roller is easily vibrated and uneven conveyance occurs. (See FIG. 9 (b)).

Further, as shown in FIG. 9 (c), when the driving roller 9 and the driven roller 10 are
Is slightly different from that of the driven roller 10, and the photosensitive material 7 does not move properly. For this reason, it is conceivable to forcibly restrict improper movement of the photosensitive material 7 by using a guide or the like, but this causes stress on the conveying surface of the photosensitive material 7.

Due to such stress on the conveying surface of the photosensitive material 7, the roller portion and the photosensitive material 7 are vibrated, and although slightly, uneven conveyance occurs.

In a normal optical scanning recording apparatus, the slight transport unevenness as described above hardly affects the image quality. However, in the case of a gradation image, constant speed is required when an intermediate density is obtained.
%.

Further, when the rollers 9 and 10 are considerably long or the support shaft diameter is small, if the nip is attempted to be nipped with a large contact pressure at the time of mounting, bending occurs as shown in FIG. 9D.

Conversely, if an attempt is made to attach the driving roller 9 and the driven roller 10 with a slight gap, as shown in FIG. 9E, the driven roller 10 will bend due to its own weight.

Even if the roller 10 can be attached without bending, the single long roller 10 will bend due to the thickness of the photosensitive material or the like during operation.

As a result, it is difficult for the drive roller 9 and the driven roller 10 to make uniform contact with each other, and vibration and vibration are liable to occur.

In this case, it is conceivable to use a soft material such as a rubber roller for the driven roller 10.
As shown in FIG.
The surface is permanently deformed, and the photosensitive material 7 is
If it reaches slightly above, it may meander.

When performing gradation recording on a photographic photosensitive material, transport unevenness that occurs in the conventional apparatus as described above and stress (pressure) generated on the transport surface poses a problem. In particular, when stress is applied to the photographic photosensitive material, fogging occurs. And the image quality is degraded.

As described above, in performing gradation recording on a photographic light-sensitive material, it is very important to reduce transport unevenness due to a signal or a stress generated on a transport surface, and to secure constant transport speed. When a stress is applied to a photographic light-sensitive material, fogging occurs and the image quality is reduced.

However, with a single driven roller that is long in the width direction as in the related art, it is difficult to secure the above constant speed.

In view of the above-described conventional problems, the present invention suppresses deflection, runout, vibration, and the like that have conventionally occurred due to the driven roller by improving the structure of the driven roller, and conveys uneven transport caused by these. Photographic photosensitive material in an image recording apparatus capable of conveying a photographic photosensitive material with high accuracy at a constant speed and improving recording performance, thereby eliminating fog and obtaining a high-quality image. An object is to provide a transport device.

<Means for Solving the Problems> For this reason, the present invention relates to a photographic photosensitive material conveying device in an image recording apparatus that performs image recording by scanning light modulated on the basis of an image signal on the photographic photosensitive material. In the photographic photosensitive material conveying apparatus, the photographic photosensitive material sandwiched between the two rollers is conveyed by the rotation of a driving roller and a driven roller, and an image is recorded on the photographic photosensitive material being conveyed. The driven roller is composed of a plurality of rollers that can rotate independently of each other.

<Operation> In the above configuration, each roller of the driven roller has a short axial length, so that the diameter of the roller is easy to obtain processing accuracy,
The peripheral speed of the roller can be made uniform regardless of the position of the roller in the longitudinal direction.

In addition, since each roller of the driven roller can rotate independently of each other, it is easy to adjust the contact state between the rollers, it is possible to suppress the occurrence of a one-side contact state, and the contact between each roller of the driven roller and the driving roller The pressure can be made uniform.

Further, it is possible to prevent the drive roller and the driven roller from being twisted and arranged, and to prevent the transport direction of the drive roller from being different from the transport direction of the driven roller, so that the photographic photosensitive material is transported in an appropriate direction. And no stress occurs on the conveying surface of the photographic light-sensitive material.

Also, since the length of each driven roller in the axial direction is short,
Bending is unlikely to occur, the driving roller and the driven roller are in uniform contact, and vibration and vibration are unlikely to occur. Further, even if vibration occurs, it can be generated at a relatively high frequency.

As described above, meandering and uneven transport of the photographic photosensitive material can be suppressed.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, an image recording apparatus employing an embodiment of a photographic photosensitive material conveying apparatus according to the present invention includes a light beam (laser beam) 2 emitted from a semiconductor laser 1.
Scans the photosensitive material 7 in a direction substantially perpendicular to the arrow Y direction via a collimator lens 3, a mirror 4, an optical deflector 5, and a converging lens 6, and the photosensitive material 7 is moved by the transport device 18 in the arrow Y direction. The light beam 2 is two-dimensionally irradiated onto the photosensitive material 7 after being conveyed and subjected to sub-scanning, which is as described in the section of the conventional example.

The photographic photosensitive material conveying device 18 includes a driving roller 19 and a driven roller 19, as is apparent from the schematic diagram of FIG.
The photosensitive material 7 sandwiched between the rollers 19 and 20 is conveyed by the rotation of the roller 20. The driven roller 20 is composed of a plurality of rollers 20a, 20b and 20c which can rotate independently.

The plurality of rollers 20a, 20b, 20c in this embodiment are each formed in a columnar shape, and include a rotating shaft that rotates independently.

FIG. 3 shows a specific example of mounting the rollers 20a, 20b, and 20c.

In this figure, a pair of support shafts 21 extending in the central axis direction are fixed to both ends of each of the rollers 20a, 20b, 20c. The two support shafts 21 of each of the rollers 20a, 20b, 20c are provided with a pair of mounting members 23 protruding from the mounting substrate 22 at a predetermined interval.
The bearing is supported to rotate freely. The peripheral surface of each of the rollers 20a, 20b, and 20c thus supported is brought into contact with the peripheral surface of a driving roller 19 that is driven to rotate by a motor (not shown). The mounting board 22 is supported by a mounting portion (not shown) by a pair of springs 24.

Next, the operation and effect of the transport device 18 having such a configuration will be described.

As described in the description of the conventional example, the diameter of the relatively long roller makes it difficult to obtain processing accuracy due to deflection during processing, and affects the deflection and deflection of the photosensitive material as a conveyed object. Since each roller 20a, 20b, 20c has a short axial length, the diameter of each roller 20a, 20b, 20c is easily processed with accuracy, regardless of the longitudinal position of each roller 20a, 20b, 20c. The circumferential speed of each roller 20a, 20b, 20c can be made uniform.

Further, since the rollers 20a, 20b, 20c are individually independent, it is easy to adjust the contact state between the rollers 19, 20. For example, by adjusting the length of the mounting member 23 of the roller 20, or by supporting the mounting substrate 22 with the spring 24 as in the present embodiment, the contact state between the rollers 19 and 20 can be easily adjusted,
It is easy to make the contact state uniform over the entire area in the longitudinal direction of the rollers 19 and 20, it is possible to suppress the occurrence of a one-sided contact state, and it is possible to make the contact pressure between the rollers 19 and 20 uniform.

In this case, even if each of the rollers 20a, 20b, and 20c is supported by a spring, the contact state between the rollers 19 and 20 can be easily adjusted.

As described above, meandering of the photosensitive material 7 can be prevented.

The drive roller 19 and the driven roller 20 can be prevented from being twisted and arranged, and the transport direction of the drive roller 10 and the driven roller 20 can be prevented.
Of the photosensitive material 7 can be prevented from being different from the transport direction of the photosensitive material 7.
Can be conveyed in an appropriate direction. In particular, there is no need to forcibly restrict improper movement of the photosensitive material 7 by using a guide or the like, and no stress occurs on the conveying surface of the photosensitive material 7. .

As described above, the stress on the conveying surface of the photosensitive material 7
Vibration does not occur in the roller portion and the photosensitive material 7, and it is possible to suppress the occurrence of uneven conveyance. As a result, it is possible to satisfy the constant speed for obtaining an intermediate density in the case of a gradation image.

Since the length of each roller 20a, 20b, 20c in the axial direction is short, even if it is nipped with a large contact pressure at the time of mounting, or if it is attempted to mount it by giving a slight gap between the driving roller 19 and the driven roller 20, it will bend. Is unlikely to occur.

For example, if the shaft is supported at both ends, the deflection of the shaft will be effective as the fourth power of the shaft length. For example, if the length per roller is 1/4 with the same material and the same diameter roller Is the amount of deflection of 1/256.

As described above, the driving roller 19 and the driven roller 20 are in uniform contact, and vibration and vibration are unlikely to occur.

In this case, the second moment of area of the mounting board 23 is
It is better to make it larger than the second moment of area of 20a, 20b, 20c.

In addition, even when the photosensitive material 7 is bitten by the roller 20 or when a soft material such as a rubber roller is used as the roller 20, the surface of the roller 20 is not permanently deformed due to the corners of the photosensitive material 7 and the like. It does not hinder efficient transport.

FIG. 4 and FIG. 5 show that the above-described effect can be promoted by simpler improvement in the case where the driven roller 20 is used.

That is, as shown in FIG. 4, in the case of three independent rollers 20a, 20b, and 20c, if the center roller 20b is separated from the driving roller 19 by a certain interval δ, High prevention effect. For example, in the case of an optical scanning image recording apparatus using a laser, the interval δ is preferably smaller than the focal depth of the laser.

As shown in FIG. 5, if the driven roller 20 is not provided up to the end of the photosensitive material 7, that is, the rollers 20a and 20a
If the c-ends are inserted inward by W from the ends of the photosensitive material 7, even when a soft material such as a rubber roller is used as the roller 20, marks such as corners of the photosensitive material 7 are formed on the rubber roller or the like. Without contact, uniform contact can be maintained.

In particular, even when burrs or the like for cutting appear on the end of the photosensitive material 7, uniform contact can be maintained.

In the above embodiment, each of the rollers 20a, 20b, and 20c is formed in a cylindrical shape. However, each of the rollers 20d, 20e, and 20f has a spherical shape that can be rotated in multiple directions, as shown in the schematic diagram of FIG. May be used.

FIG. 7 shows a specific structure of this embodiment.
20d, 20e, 20f, 20g, and 20h are rotatably supported in multiple directions on a spherical seat 26a of a roller receiving member 26 provided upright at predetermined intervals on the mounting member 25. Each roller 20d, 20 thus supported
The surfaces of e, 20f, 20g, and 20h are in contact with the peripheral surface of the drive roller 19. A spring 27 is inserted into a mounting hole 26b communicating with the spherical seat 26a of the roller receiving member 26, and acts to press each roller 20d, 20e, 20f, 20g, 20h against the driving roller 19. ing.

As described above, even in the embodiment using a spherical roller as the rollers 20d, 20e, 20f, 20g, and 20h, the operation and effect of the above-described embodiment are exhibited. If it is, it has a higher hit prevention effect.

In the embodiment of FIG. 1, the rollers 20a, 20b, 20c
Although the independent support shaft 21 is fixed and the support shaft 21 is rotatably supported, the roller may be rotatably supported on a single common shaft.

Further, in the embodiment of FIGS. 2 and 3, three rollers are provided, and in the embodiment of FIGS. 6 and 7, five rollers are provided, respectively. Regardless of the number, any number may be used.

<Effects of the Invention> As described above, according to the present invention, a photographic photosensitive material transport device in an image recording apparatus that performs image recording by scanning light modulated on the basis of an image signal on the photographic photosensitive material. There is a configuration in which the photographic photosensitive material held between the two rollers is transported by the rotation of the driving roller and the driven roller, and the image is recorded on the photographic photosensitive material being transported. , Because it is composed of a plurality of rollers that can rotate independently of each other, it is possible to suppress the deflection, runout, vibration, and the like that have conventionally occurred due to the driven roller, and to eliminate transport unevenness caused by these. This makes it possible to convey a photographic light-sensitive material with high accuracy at a constant speed, to improve recording performance, and to obtain a high-quality image without fogging.

[Brief description of the drawings]

FIG. 1 is a schematic view of an image recording apparatus to which an embodiment of a photographic photosensitive material conveying apparatus according to the present invention is applied, FIG. 2 is a schematic view of an embodiment of the above conveying apparatus, and FIG. FIGS. 4 and 5 are schematic views showing an improved example of the above embodiment, FIG. 6 is a schematic view of another embodiment, FIG. 7 is a front view showing a concrete example thereof, FIG. 8 is a schematic view of an image recording apparatus to which a conventional photographic photosensitive material conveying apparatus is applied, and FIGS.
(F) is a schematic diagram showing a drawback of the conventional transport device of the above. 1 ... Semiconductor laser, 7 ... Photosensitive material, 18 ... Photosensitive material transport device, 19 ... Drive roller, 20 ... Driving roller, 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h ... …roller

Continuation of the front page (56) References JP-A-63-148275 (JP, A) JP-A-50-58926 (JP, A) JP-A-63-26182 (JP, U) JP-A-59-176837 (JP, A) , U) Actually open sho 59-68359 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B65H 5/06 H04N 1/23

Claims (1)

(57) [Claims] 1. A photographic photosensitive material conveying device in an image recording apparatus for recording an image by scanning light modulated on the basis of an image signal on the photographic photosensitive material, wherein the driving roller and the driven roller rotate to rotate the photosensitive material. In a photographic light-sensitive material conveying device configured to convey a photographic light-sensitive material sandwiched between rollers and perform image recording on the photographic light-sensitive material being conveyed, the driven rollers are independently rotated. A photographic photosensitive material conveying device in an image recording apparatus, comprising a plurality of possible rollers.