JPH01179927A - Carrying device for undeveloped film - Google Patents

Abstract

PURPOSE:To prevent one point of an undeveloped film from being concentratedly irradiated and exposed for a long time with a light emitting part by a detecting slack of the film by interruption of light which is transmitted from a light emitting part to a light receiving part in accordance with the extent of slack of the film. CONSTITUTION:Light emitting parts 411 and 511 of slack detectors 4 and 5 are arranged on the side nearer to a continuous carrying roll 1, and light receiving parts 412 and 512 are arranged on sides nearer to interruptedly carrying rolls 2 and 3, and a film F forms a loop slack between these light emitting parts and light receiving parts. The film F is moved between the upper limit position corresponding to a maximum extent of slack and the lower limit position corresponding to a minimum extent of slack while being irradiated with the light from light emitting parts. In this case, the rotative speed of interruptedly carrying rolls is higher than that of the continuous carrying roll to carry the film momently when interruptedly carrying rolls 2 and 3 are rotated. Thus, the time when the light from light emitting parts is projected to one point of the film is short to reduce the total quantity of light, and exposure due to light emitting parts is difficult.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an apparatus for transporting undeveloped film.

[Prior Art] Conventionally, for example, a laser recording apparatus has been equipped with a conveyance unit that conveys a long undeveloped film at an extremely low speed for recording image information using a laser. This conveying device continuously conveys a long undeveloped film, as disclosed in JP-A-62-249138, for example.
A continuous conveyance roller that performs scanning, an intermittent conveyance roller placed before and after the conveyance roller that intermittently conveys the undeveloped film, and a lock between the continuous conveyance roller and the intermittent conveyance roller that detects slack in the undeveloped film. It consists of a sag detector. Note that the slack detector is used to create slack in the film before and after the continuous conveyance roller, so as not to apply a load to the film feed of the continuous conveyance roller.

[Problems to be Solved by the Invention] In the above-mentioned conventional conveying device, the LE is used as a slack detector.
A detector consisting of a light emitting section such as D and a light receiving section such as a photodiode can be used. In this case, as shown in FIG. 6, if the light emitting section 431B is disposed on the side far from the continuous conveyance roller, the light emitting section 431B is at the upper limit position while the slack portion of the film F moves from the lower limit position to the lower limit position. 431
One point on the film F that was receiving the irradiation light from B moves from the B1 position to the B2 position. During this time, the amount of light that a point on the film F receives from the light emitting section changes with time as shown in the graph shown in FIG. In this case, the total amount of light received by one point on the film F is determined by integrating the amount of light over time (shown with diagonal lines in Figure 7), and if the transfer wJll is small when the optical path is blocked, the irradiated light will be Since the light will be exposed for a long time, the total amount of light will be large. Therefore, even if the light emitting part 431B is a light emitting unit such as an LED with a small amount of light, if the total amount of light received at one point on the film F becomes large, a problem arises in that the light emitting part 431B is exposed. In particular, when the undeveloped film F is a highly sensitive film such as a wet film, it is easily exposed to light by the light emitting section 431B.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a transport system for undeveloped film that can prevent one point of the undeveloped film from being intensively irradiated and exposed for a long time by a light emitting section. The aim is to provide lA11It.

[Means for Solving the Problems] The undeveloped film conveying device of the present invention includes a continuous conveying roller that continuously conveys a long undeveloped film, and a continuous conveying roller arranged at least on one side of the front and back of the continuous conveying roller, It consists of an intermittent conveyance roller that intermittently conveys the undeveloped film, a light emitting section disposed on the side close to the continuous conveyance roller, and a light receiving section disposed on the side close to the intermittent conveyance roller. and a sag detector that detects sag by intermittent transmission of light from the light emitting section to the light receiving section depending on the size of the sag, and the drive of the intermittent conveyance roller is controlled by the detection signal of the sag detector. That is.

[Function 1] In the undeveloped film conveyance device of the present invention, the slack detector is disposed between the continuous conveyance roller and the intermittent conveyance roller provided at least on one side of the front and back of the conveyance roller, and the light emitting part of the slack detector is placed on the side closer to the continuous conveyance roller, and the light receiving section is placed on the side closer to the intermittent conveyance roller. The film forms a loop-shaped slack between the light emitting section and the light receiving section. When the film is continuously transported by the continuous transport roller, the slack of the film becomes smaller on the upstream side of the continuous transport roller, so the intermittent transport roller on the upstream side is driven intermittently to transport the film to the slack detector. However, since the rotational speed of the intermittent conveyance roller is sufficiently faster than that of the continuous conveyance roller, the slack increases instantly. In this way, the film maintains an appropriate amount of slack.

On the other hand, the slack in the film increases on the downstream side of the continuous conveyance roller, so the intermittent conveyance roller on the downstream side is driven intermittently to carry out the film from the slack detector, and the rotation speed of the intermittent conveyance roller changes to that of the continuous conveyance roller. Because it is fast enough compared to
The sagging will instantly become smaller. In this way, the film is held with an appropriate amount of slack. in this case,
The film moves between an upper limit position where the slack of the film is maximum and a lower limit position where the film is minimum while receiving the irradiation light from the light emitting section. At this time, when the intermittent conveyance roller rotates, the rotation speed of the intermittent conveyance roller is faster than that of the continuous conveyance roller, and because the film is instantaneously conveyed, the irradiation time that one point on the film receives from the light emitting section is short, and the total amount of light is small. Therefore, it is difficult to be exposed to light by the light emitting part.

On the other hand, when the intermittent conveyance roller is stopped, the movement per unit time in the direction in which a point of the undeveloped film retreats from the optical path is higher on the continuous conveyance roller side than on the intermittent conveyance roller side. big. Therefore, if the light-emitting part of the sag detector is placed on the side closer to the continuous conveyance roller and the light-receiving part is placed on the side closer to the intermittent conveyance roller, the irradiation time that one point on the film receives from the light-emitting part will be short, the total amount of light will be small, and the film will be The light emitting part makes it difficult to be exposed to light.

[Example] Hereinafter, a specific example of transporting an undeveloped film [1] of the present invention will be described based on the drawings.

The undeveloped film conveyance device of this embodiment is incorporated into a laser recording device, and FIG. 1 is a block diagram showing the film conveyance path of the laser recording device. Explanatory diagrams of the operations are shown in FIG. 2, respectively.

The undeveloped film conveyance device of this embodiment includes a main roller (continuous conveyance roller) 1, first and second drive rollers (
The main components are an intermittent conveyance roller) 2.3 and first and first sag detectors 4.5.

The main roller 1 is arranged on a running path 65 for undeveloped film formed between the film feeding cassette 60 and the film storage cassette 70. The main roller 1 is driven by a stepping motor (not shown) and rolls the film F in contact with its outer peripheral surface at an extremely low speed (2
, 5-1/5 eC). Two presser rollers 11 are provided on the sides of the main roller 1 to bring the transported film F into contact with the outer peripheral surface of the main roller 1.
．． 12 is provided, and the position between the presser rollers 11 and 12 is the recording position of the image information. Note that, facing this recording position, a laser recording device W180 contacts the outer peripheral surface of the main roller 1 and prints image information onto the transported film F.
is provided.

The first drive roller 2 is provided inside the film feed cassette 60, and is driven by a drive shaft (not shown) that is inserted when the film feed cassette 60 is mounted on the main body of the laser recording apparatus. This first drive roller 2 is driven by a detection signal from a sagging detector 4, which will be described later.
all are driven intermittently, and the film feeding cassette 6
0 to the main roller 1. Note that the film conveyance speed when driving the first drive roller 2 and the second drive roller 3 (described later) is set to be faster than the film conveyance speed of the main roller 1.

The second drive row 53 is disposed between the film storage cassette 70 and the second curl detector 5 provided on the downstream side of the main roller 1, and is driven by a DC motor (not shown). This second drive roller 3 is detected by a sagging detector 5, which will be described later, to detect I! IJI! ll and is driven intermittently to send the film F from the sagging detector 5 to the film storage cassette 70.

The sag detector 4 is disposed between the first drive roller 2 and the main roller 1, and is located between a pair of EDs (light emitting parts).
411 and a photodiode (light receiving section) 412; and a lower limit detection section 43 consisting of a pair of LEDs 431 and a photodiode 432.

When the upper limit detection unit 41 detects the upper limit position where the slack of the loop-shaped film F becomes maximum (LED 4
11), the drive of the first drive roller 2 is stopped. When the lower limit detection unit 43 detects the lower limit position where the slack of the film F is the minimum (LED 431
When the irradiation light is transmitted from the photodiode 432 to the photodiode 432), the first drive roller 2 is driven. The upper and lower limit detection units 41.43 are arranged at a predetermined interval so that the direction of irradiation from the LED 411.431 to the photodiode 412.432 is parallel.

Then, each LF with respect to the conveyance direction of the film F, which is conveyed in a slack state in a loop shape.

D411, 431 are arranged on the side closer to the main roller 1, and each photodiode 412, 432 is arranged on the side closer to the first drive row 52, respectively.

The sag detector 5 is disposed between the main roller 1 and the second drive roller 3, and includes an upper limit detection section 51 consisting of a pair of LEDs 511 and a photodiode 512;
It consists of a lower limit detection section 53 consisting of a pair of LEDs 531 and a photodiode 532. When the upper limit detection unit 51 detects the upper limit position where the slack of the loop-shaped film F is maximum (when the irradiation light from the LED 511 to the photodiode 512 is ml), the upper limit detection unit 51 detects the second drive roller 3. It is what drives it. When the lower limit detection unit 53 detects the lower limit position where the slack of the film F is minimum (from the LED 531 to the photodiode 53
2), the drive of the second drive roller 3 is stopped. The second detector 5 is also made of the same members as the sag detector 4,
Each LED511.531 is on the side closer to the main roller 1,
Each photodiode 512, 532 is connected to the second drive roller 3.
They are placed on the side closest to each other.

Note that the film F travel path 65 has an automatic loading mechanism for setting the film on the travel path 65.
A sensor 90 for detecting the leading edge of the film F, a guide rail 92 for guiding the film F, and the like are provided.

The undeveloped film transporting device of this embodiment is constructed as described above, and its operation will be explained next.

First, as shown in FIG. 1, the sensor 90 is activated, the autoloading mechanism feeds the undeveloped film F from the film feeding cassette 60, the leading end of the film is wound into the film storage cassette 70, and the film F is transported along the travel path. 6
5, after which the sensor 90 is deactivated.

This makes it possible to start recording image information onto the film F.

Then, when recording on the film F is started by the laser recording device 80, the main roller 1 is continuously driven at a very low speed by a stepping motor in synchronization with this, and the conveyance of the film F is started. Simultaneously with this start, the first and second sag detectors 4.5 are activated. At this time, if the film F is not at the lower limit position in the sag detector 4, the sag portion of the film F gradually becomes smaller as the main roller 1 transports the film. And finally film F
1-ED431 of the lower limit detection section 43 that was blocked by
The irradiation light is transmitted to the photodiode 432. The first drive roller 2 is driven by the detection signal received by the photodiode 432, and the film F is conveyed toward the sag detector 4. As a result, since the film conveying speed of the first drive roller 2 is faster than that of the main roller 1, the slack of the film F increases rapidly, and the photodiode 412 from the LED 411 of the upper limit detection section 41 increases.
The irradiation light that was being irradiated to the first drive roller 2 is cut off, and the drive of the first drive roller 2 is stopped based on this detection signal. Thereafter, while the main row 51 is continuously transporting the film F, the first drive row 52 repeats the above operation to transport the film F.
is intermittently conveyed to the sag detector 4. As a result, the sagging portion of the film F formed by the sag detector 4 moves between the upper limit position and the lower limit position, and is maintained within a substantially constant size range.

Here, when the slack of the film F moves from the upper limit position to the lower limit position, the one point of the film F that was receiving the irradiation light from the LED 431 of the lower limit detection section 43 at the upper limit position of the film F is greatly shifted from the A1 position to the A2 position. Moving.

In other words, the amount of movement of the film F from the optical path when moving from the A1 position to the A2 position is the amount of movement when the LED is placed closer to the first drive roller (81 in FIG. 6).
position to position 82), and the time irradiated to the - point is short. Therefore, as shown by diagonal lines in FIG.
Due to the ED431, the total amount of light received by one point on the film F is small. Further, moving the film F from the lower limit position to the upper limit position requires a shorter time than moving from the upper limit position to the lower limit position, and therefore the total amount of light received by one point of the film F by the LED 431 is small.

On the other hand, in the sag detector 5, when the main row 51 starts to be driven, the sag of the film F increases. Then, when the slack of the film F reaches the upper limit position, the irradiation light of the LED 511 that has been transmitted to the photodiode 512 is cut off. The second drive roller 3 is driven by this detection signal, and the film F is conveyed toward the film storage cassette 70. As a result, the slack of the film F becomes small, and the LED of the lower limit detection section 53
The irradiation light of 531 is transmitted to the photodiode 532,
This detection signal causes the second drive roller 3 to stop. Thereafter, while the film F is continuously conveyed by the main 0-51, the second drive port repeats the above operation to intermittently transport the film F from the sag detector 5 to the film storage cassette 70. transport.

Also in the case of this sag detector 5, the sag detector 4
As in the case of , since the LEDs 511 and 531 are arranged on the side closer to the main roller 1, when the slack of the film F moves from the lower limit position to the upper limit position, the LED 531 of the lower limit detection section 53 indicates that the slack of the film F moves from the lower limit position to the upper limit position. One point on the film F that was receiving the irradiation light moves significantly with respect to the optical path, and the irradiation time is short. Therefore, LED53
1, the total amount of light received by one point on the film F is small. Further, the time required to move the slack of the film F from the upper limit position to the lower limit position is shorter than that from the lower limit position to the upper limit position, and therefore the total amount of light received by one point of the film F by the LED 531 is small.

As described above, the transport a@r of the undeveloped film of this example was able to prevent the film F(7)-a from being intensively irradiated and exposed for a long time by the LED 431.531.

There are two types of undeveloped film used in laser recording devices and the like: dry film and wet film, and the spectral sensitivity curves of both films are shown in FIGS. 4 and 5. That is, the specific sensitivity of a wet film is around 0.0, while the specific sensitivity of a dry film is -3.01)fl
later, and wet film is easier to expose. Therefore, when using a wet film, LED 411.431.511.5 of slack detector 4.5 as in the above embodiment.
It is particularly effective to arrange the roller 31 on the side closer to the main roller 1.

In addition, although the first drive roller 52 and the second drive roller 3 were intermittently controlled, the lll1111
A similar effect can be obtained by

[Effect of R-light] The undeveloped film conveying device of the present invention is composed of a light emitting section placed near the continuous conveying roller and a light receiving section placed on the copper near the intermittent conveying roller. The apparatus includes a slack detector that detects slack by intermittent transmission of light from the light emitting section to the light receiving section depending on the size of the slack.

As a result, when the intermittent conveyance roller stops, the amount of movement per unit time in the direction in which a single point in the undeveloped film that is formed on the sag detector retreats from the optical path is smaller than that of the continuous conveyance roller. Since the sides are larger, the total amount of light received from the light emitting section at one point on the undeveloped film is reduced. In addition, when the intermittent conveyance roller rotates, the rotation speed of the intermittent conveyance roller is faster than that of the continuous conveyance roller, and because the film is instantaneously conveyed, the irradiation time that one point on the film receives from the light emitting section is short, and the total amount of light is small. . Therefore, when the intermittent conveyance roller rotates,
When stopped, the undeveloped film is less likely to be exposed to light by the light emitting section.

[Brief explanation of the drawing]

1 to 5 relate to embodiments of the present invention, FIG. 1 is a configuration diagram showing a film conveyance path of a laser recording device incorporating an undeveloped film conveyance ill, and FIG. 2 is a curvature detector. Explanatory diagram showing the movement of undeveloped film in , 3rd
The figure is a graph showing the relationship between the amount of light received at a point on the undeveloped film in Fig. 2 and time, Fig. 4 is a graph showing the spectral sensitivity curve of the dry film, and Fig. 5 is a graph showing the spectral sensitivity curve of the wet film. It is. Fig. 6 is an explanatory diagram showing the movement of the undeveloped film when a problem occurs in the sag detector, and Fig. 7 is a graph showing the relationship between the amount of light received at a point on the undeveloped film in Fig. 6 and time. . 1... Main roller (continuous conveyance roller) 2... 1st
Drive roller (intermittent conveyance roller) 3...Second drive roller (intermittent conveyance roller) 4...First sag detector 5...First sag detector

Claims (2)

[Claims] (1) a continuous conveyance roller that continuously conveys a long undeveloped film; an intermittent conveyance roller that is disposed on at least one front and rear side of the continuous conveyance roller and that intermittently conveys the undeveloped film; and the continuous conveyance roller and a light receiving part located near the intermittent conveyance roller, and the light transmitted from the light emitting part to the light receiving part is interrupted depending on the amount of slack in the undeveloped film. 1. A conveying device for undeveloped film, comprising: a sag detector for detecting sag; and a detection signal from the sag detector controls driving of the intermittent conveying roller. (2) The undeveloped film conveying device according to claim 1, wherein the light emitting section is an LED and the light receiving section is a photodiode.