JPH06156841A - Detector for residual quantity of sensitive member on planar scanning type image recording device - Google Patents

Abstract

PURPOSE:To detect the residual quantity of a film (sensitive member) in a simple manner. CONSTITUTION:The first calculating means 75 calculates the time necessary for the change of the slack quantity to the upper limit value from the lower limit value or to the lower limit value from the upper limit value on the basis of the detection signal of a limit switch (sensor) 80 for detecting the slack quantity of the slack 100 of a film (sensitive member) 20. The second calculating means 76 calculates the residual quantity of a roll film 24 on the basis of the obtained time and the speed of the roll film 24 which is controlled by the first control means 90. Accordingly, the residual quantity of the roll film 24 can be detected in a simple manner by using a device for generating the slack quantity of the slack 100 within a nearly constant range, as it is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flatbed scanning image recording apparatus such as a flatbed output scanner or an image setter for printing plate making, and more particularly to a device for detecting the remaining amount of the photosensitive material.

[0002]

2. Description of the Related Art Generally, a plane scanning image recording apparatus draws a film, which is a light-sensitive material, from a roll film (light-sensitive material roll), holds the main roller and a nip roller, and drives the main roller to rotate. , The film is conveyed in the sub-scanning direction. Then, the optical system performs main scanning with the laser beam in synchronization with the conveyance of the film in the sub-scanning direction to expose and record a duplicate image on the film.

At this time, on the film on the main roller,
"Slip" may occur due to the tension from the upstream side or the downstream side. When this "slip" occurs, the film is displaced, and a good duplicate image cannot be obtained. In this case, it is known that the "slip" of the film on the main roller is suppressed by forming a talumi on the film on the upstream side and the downstream side of the main roller. For example, JP-A-4-479 by the present applicant
There is a method using a travel roller disclosed in Japanese Patent Laid-Open No. 62-62. This conventional planar output scanner is shown in FIG.

First, the introduction roller 3 is rotated by driving the motor M ₁ , and the film 1 is pulled out in the sub-scanning direction (Y direction) from the roll film 2 accommodated in the film magazine 11, and the main roller 5 and the nip roller 6 are connected. Send until. Then, the introduction roller 3 is stopped and the film 1 is held between the nip roller 6 and the main roller 5. next,
The introduction roller 3 is rotated again, and the travel roller 4 moves in the Z direction in synchronization with the feeding of the film 1 in the Y direction, so that the talumi 16 is formed.

Next, the film 1 on which the talumi 16 is formed is sandwiched between the nip roller 6 and the main roller 5, and the main roller 5 is rotated at a constant speed by driving the motor M ₂ to form the film 1. Transport in Y direction. The optical system 7 is the film 1 in the Y direction.
The laser beam is scanned in the main scanning direction (the direction perpendicular to the paper surface) in synchronism with the conveyance of (1) to expose and record a duplicate image on the film 1.

Further, when the film 1 is conveyed in the Z direction from the main roller 5 during the exposure recording of the film 1, the guide 12 forms the talumi 17. In this way, the tarmi 16, 17 before and after the film 1 on the main roller 5
To form a film 1 during exposure recording.
It prevents unnecessary application of external force to the. The talumi 16 and 17 are controlled by a control means (not shown) so as to be in a substantially constant range.

Next, the exposed and recorded film 1 is further conveyed by a predetermined length in the Z direction, and then automatically cut by a cutter 8. In this way, a film piece of a predetermined size on which the duplicate image is recorded is formed.

Next, the film piece is collected by the discharge roller 9 which is rotated by the drive of the motor M ₃ and is collected by the collecting magazine 1.
Recovered to 0.

Here, as the duplicate image is exposed on the film 1, the film 1 of the roll film 2 decreases, and the film 1 may run short during the exposure. In this case, after the roll film 2 is replaced with a new one, the duplicate image is exposed and recorded again from the beginning, resulting in waste of time and money. Therefore, before starting the exposure recording, it is necessary to confirm the remaining amount of the film 1 of the roll film 2 in advance. FIG. 14 shows a conventional device for detecting the remaining film amount of the roll film 2.

As shown in FIGS. 14a and 14b, this apparatus obtains the rotation angular velocity B of the roll film 2 from the encoder 13 connected to the rotation shaft 2 _S of the roll film 2 and the motor M ₁ to rotate the film 1 from the encoder 13. The transport speed V is obtained, the current winding outer diameter R of the roll film 2 is calculated, and the remaining film amount is detected. The outer diameter of the roll core of the roll film 2 is R ₀ , the thickness of the film 1 is T, and the remaining film amount of the roll film 2 is L. Hereinafter, a calculation formula for detecting the remaining film amount L of the roll film 2 will be shown.

Since the winding outer diameter R of the roll film 2 and the rotational angular velocity B of the film 1 are proportional to each other, R = V / B (1) and L = π × (R ² −R ₀ ² ) / T (2) Substituting the equation (1) into the equation (2), L = π × (V ² −R ₀ ² × B ² ) / T × B ² (3) In the equation (3), constants of R ₀ and T, The remaining film amount L can be calculated by giving the respective measured values of V and B.

FIG. 15 shows another conventional apparatus for detecting the remaining amount of film. This device is equipped with a motor M _{1 for the} introduction roller 3.
The encoder 14 is connected to. Pulse counter 15
Counts the output pulses from the encoder 14. The length of the conveyed film 1 is calculated based on the count value of the pulse counter 15. The transport length calculated from the initial film length of the roll film 2 (for example, 60 m) is subtracted to detect the remaining amount. In addition, the motor M ₂ of the main roller 5
The same is true when an encoder is connected to.

Conventionally, such a device has been used to detect the remaining amount of film in a flatbed scanning image recording device.

[0014]

However, the film remaining amount detecting device in the conventional flatbed image recording device has the following problems.

As described above, in the conventional apparatus, it is necessary to install a special detecting device such as an encoder for detecting the remaining amount of the film. Therefore, there is a problem that the cost and the space are increased due to the necessity of newly installing the encoder and the like and controlling them.

An object of the present invention is to solve the above problems and to easily detect the remaining amount of the photosensitive material.

[0017]

According to another aspect of the present invention, there is provided a photosensitive material remaining amount detecting device in a flat-scanning image recording apparatus according to claim 1, wherein the photosensitive material is wound in a roll shape, and the photosensitive material roll is sent out from the photosensitive material roll. The photosensitive material is sandwiched between the nip roller and the main roller for conveying in the sub-scanning direction, and the light beam is scanned in the main scanning direction substantially orthogonal to the sub-scanning direction, and is conveyed at a constant speed by the main roller. An optical system for exposing and recording a duplicate image on a sensitive material, a sensor for detecting an upper limit value and a lower limit value of the tarumi amount of the sensitive material tarumi formed between the sensitive material roll and the main roller, and detection by the sensor Based on a signal, a control for controlling the speed of the photosensitive material roll so as to decrease the Talumi amount when the Talumi amount reaches the upper limit value and increase the Talmi amount when the Talumi amount reaches the lower limit value. Means and In the flat scanning image recording device, a device for detecting the remaining amount of the photosensitive material of the photosensitive material roll, based on the detection signal of the sensor, the amount of Talumi from the lower limit to the upper limit or from the upper limit to the lower limit. First calculation means for obtaining the time required for the change, and the remaining amount of the sensitive material based on the time obtained by the first calculation means and the speed of the sensitive material roll controlled by the control means. And a second calculating means for obtaining.

[0018]

In the flat material scanning image recording apparatus according to the present invention, the remaining amount of the sensitive material is based on the detection signal of the sensor for detecting the amount of the salami of the sensitive material by the first computing means. From the above, the time required to change from the upper limit value or the upper limit value to the lower limit value is obtained. The second calculation means calculates the remaining amount of the sensitive material of the sensitive material roll based on the time calculated by the first calculation means and the speed of the sensitive material roll controlled by the control means. Therefore, the remaining amount of the sensitive material can be easily detected by using the apparatus for forming the sensitive material tarmi in a substantially constant range as it is.

[0019]

FIG. 5 is a perspective view of an image setter 18 (planar scanning image recording apparatus) according to an embodiment of the present invention.
The imagesetter 18 conveys the film 20, which is a photosensitive material, in the sub-scanning direction (Y direction) while moving in the sub-scanning direction (Y direction).
Direction) and a light beam is scanned in a main scanning direction (X direction) that is substantially orthogonal to the (direction), and a duplicate image is exposed and recorded on the film 20. The schematic operation of the imagesetter 18 will be described below with reference to this drawing.

First, the introducing roller 26 is rotated by the drive of the motor 40, and the roll film 24 to the film 20 are rotated.
In the Z direction (direction orthogonal to the X and Y directions).
Reference numeral 22 is a film magazine. Further, the film 20 is sent to the lower side of the nip roller 32.
Next, the nip roller 32 holds the film 20 by applying a nip pressure to the main roller 28 in the Z direction. next,
The main roller 28 rotates at a constant speed by driving the motor 42, and conveys the film 20 in the Y direction while sandwiching the film 20 with the nip roller 32.

Next, the light source 46, the lens 48, and the deflector 5
An optical system 60 including a scanning lens 52 and a scanning lens 52 scans a light beam in the X direction in synchronism with the transport of the film 20 in the Y direction by the main roller 28 to expose and record a duplicate image on the film 20. To do.

The recorded film is conveyed by a predetermined length in the Y direction and then cut by the cutter 34. Thus, a film piece of a predetermined size on which the duplicate image is recorded is obtained. The film piece is collected in the collection magazine 38 by the discharge roller 36 driven by the motor 44.

FIG. 6 is a schematic sectional view of the imagesetter 18 shown in FIG. The imagesetter 18 includes a U-shaped talumi 10 before and after the film 20 on the main roller 28.
0 and 102 are formed and the film 20 is conveyed. This U
The character-shaped talumi 100 and 102 are provided to prevent “slip” and vibration of the film 20. The present invention detects the remaining film amount of the roll film 24 by using an apparatus that forms the amount of Talumi 100 and 102 in a substantially constant range.

FIG. 7 shows a functional block diagram of an apparatus for forming the tarumi 100 and 102 in a substantially constant range. The limit switch 80, which is the first sensor, detects the amount of tarumi of the tarumi 100. The first control means 90 is the talumi 10
If the Talumi amount of 0 is less than or equal to the lower limit value, the rotation speed of the motor 40 for driving the introduction roller 26 is made faster than the rotation speed of the main roller 28 based on the output signal of the limit switch 80, and the Talmi amount is greater than or equal to the upper limit value. If so, the rotation speed of the motor 40 is made lower than the rotation speed of the main roller 28 based on the output signal of the limit switch 80. In this way, the tarumi 100 is controlled within a substantially constant range.

The limit switch 82 which is the second sensor
Detects the amount of Talumi 102. The second control means 92 causes the rotation speed of the motor 44 for driving the discharge roller 36 to be slower than the rotation speed of the main roller 28 based on the output signal of the limit switch 82, if the amount of the tarumi of the tarumi 102 is less than or equal to the lower limit value. If the amount of Talumi is greater than or equal to the upper limit value, the rotation speed of the motor 44 is made higher than the rotation speed of the main roller 28 based on the output signal of the limit switch 82. In this way, the tarumi 102 is controlled within a substantially constant range.

Next, referring to FIG. 6, a U-shaped tarmi 100.
The formation state of will be described. This U-shaped Talmi 100 is
It is formed by the first guide 70. The guide 70 is arranged as follows.

The guide 70 is provided between the introduction roller 26 and the main roller 28 and has a curved shape. The guide 70 is arranged so that the straight portion 70 _a of the upper curved part of the traveling direction (Z-direction) and guide 70 of the film 20 drawn from the introduction roller 26 are substantially parallel. Further, the straight portion 70 _b and the main roller 28 of the lower curved portion of the guide 70 the film 20 and the (opposite direction of the Z-direction) tangentially are arranged substantially in parallel to be sent.

With the arrangement of the guide 70 as described above, a U-shaped talumi 100 is formed on the film 20 fed from the introducing roller 26. This state is shown in FIG. First, FIG.
As shown in a, the film 20 has a guide 70 in the Z direction.
Be pulled out. Furthermore, when pulled out in the Z direction,
As shown in FIG. 8B, the traveling direction is changed to the opposite direction of the Z direction along the guide 70 curved in a U shape, and the sheet is fed to the main roller 28. In this way, the film 20 forms the U-shaped tarumi 100. Figure 8c
The U-shaped Talumi 100 thus formed is shown in FIG.

Next, FIG. 9 shows a state in which the amount of Talumi of the U-shaped Talumi 100 is detected. In this embodiment, the limit switch 80 is provided so that the stylus 80 _S contacts the Talumi 100. A slit (not shown) is formed in the guide 70, and the stylus 80 _S penetrates this slit. The limit switch 80 is shown in FIG. 10a.

FIG. 10b shows its ON-OFF operation. In FIG. 10b, the horizontal axis represents the angle of the stylus 80 _S from the overlimit position. OF shown in point a
The angle of the stylus 80 _S gradually increases from the state of F, and α
When it reaches °, it turns on. Next, the O shown at point B
When the angle of the stylus 80 _S is decreased from the N state, β °
Changes from the ON state to the OFF state. in this way,
The limit switch 80 has a hysteresis characteristic. The stop position of the stylus 80 _S may be point D or point _C in FIG. 10b due to overshooting, but this is not an essential problem, so these are ignored here.

It is assumed that the talumi 100 is formed on the film 20 and the introduction roller 26 is rotated by the motor 40. Here, as shown in FIG. 9a, when the Talumi 100 becomes smaller and reaches the lower limit value (10
0 _MIN ), the angle of the stylus 80 _S of the limit switch 80 is α
Reach °. Therefore, the limit switch 80 is turned on. The first control means 90 in FIG. 7 takes in a switch ON output signal from the limit switch 80 and outputs a high speed mode command to the motor 40. In response to this, the motor 40 is rotated at high speed. As a result, the feeding speed of the film 20 by the introduction roller 26 becomes higher than the feeding speed of the film 20 by the main roller 28, and the amount of talumi of the talumi 100 increases. This state continues until there is a switch OFF output signal from the limit switch 80.

Then, as shown in FIG.
When 0 increases and reaches the upper limit (100 _MAX ), the angle of the stylus 80 _S of the limit switch 80 becomes smaller than β °. Therefore, the limit switch 80 is switched off.
become. The first control means 90 of FIG. 7 takes in the switch OFF output signal of the limit switch 80 and
The low speed mode command is output to 0. In response to this, the motor 40 is rotated at a low speed. As a result, the introduction roller 26
The transport speed of the film 20 by the main roller 28 becomes lower than the transport speed of the film 20 by the main roller 28.
The amount of tarmi of 00 decreases. This state continues until there is a switch ON output signal from the limit switch 80.
In this way, the apparatus can form the talumi 100 having a talmi amount in a substantially constant range without synchronizing the motor 40 for driving the introduction roller 26 and the motor 42 for driving the main roller 28. it can.

Next, referring to FIG. 6, a U-shaped tarmi 102.
The formation state of will be described. This U-shaped Talumi 102 is
It is formed by the second guide 72. The guide 72 is arranged as follows.

The guide 72 is provided between the main roller 28 and the discharge roller 36 and has a curved shape. The guide 72 is arranged in the Y direction in which the exposed film 20 is fed from the main roller 28 and the guide 72.
The left curved portion is arranged so as to be substantially parallel to the straight portion 72a. In addition, the straight portion 72 of the right curved portion of the guide 72
_b and the tangential direction (opposite to the Y direction) in which the exposed film 20 is fed to the discharge roller 36 are arranged substantially parallel to each other. In this embodiment, the guide 72
Are provided inside and outside.

With the arrangement of the guide 72 as described above, the exposed film 20 sent from the main roller 28 is U-shaped.
A character-shaped talumi 102 is formed. This state is shown in FIG.

First, as shown in FIG. 11a, the exposed film 20 is sent to the guide 72 in the Y direction. Further, when it is fed in the Y direction, as shown in FIG. 11B, it is fed to the discharge roller 36 while changing its traveling direction to the opposite direction of the Y direction along the guide 72 curved in a U shape. In this way, the exposed film 2
0 changes the traveling direction from the delivery direction from the main roller 28 to the opposite direction to the delivery direction sent to the discharge roller 36 along the curve of the guide 72, and thus U
A character-shaped talumi 102 is formed. FIG. 11c shows the U-shaped Talumi 102 thus formed.

Next, FIG. 12 shows a state in which the amount of Talumi of the U-shaped Talumi 102 is detected. Also in this case, the limit switch 82 serving as the second sensor is provided so that the stylus 82 _S comes into contact with the talumi 102. Further, a slit (not shown) is formed in the inner guide 72, and the stylus 82 _S passes through this slit. The limit switch 82 operates similarly to the limit switch 80.

It is assumed that the talumi 102 is formed on the film 20 and the discharge roller 36 is rotated by the motor 44. Here, as shown in FIG. 12a, when the Talumi 102 becomes smaller and reaches the lower limit value (10
2 _MIN ), the angle of the stylus 82 _S of the limit switch 82 is α
Reach °. Therefore, the limit switch 82 is turned on. The second control means 92 in FIG. 7 takes in the switch ON output signal of the limit switch 82 and outputs a low speed mode command to the motor 44. In response to this, the motor 44 is rotated at a low speed. As a result, the discharge roller 3
The transport speed of the film 20 by 6 is the main roller 28
The conveying speed of the film 20 becomes lower than that of the film 20, and the amount of talumi of the talumi 102 increases. This state continues until there is a switch OFF output signal from the limit switch 82.

Then, as shown in FIG.
When 02 becomes large and reaches the upper limit value (102 _MAX ), the angle of the stylus 82 _S of the limit switch 82 becomes smaller than β °. Therefore, the limit switch 82 is the switch OF.
Become F. The second control means 92 in FIG. 7 takes in the switch OFF output signal of the limit switch 82 and outputs a command for the high speed mode to the motor 44. In response to this, the motor 44 is rotated at high speed. As a result, the discharge roller 3
The transport speed of the film 20 by 6 is the main roller 28
Therefore, the conveying speed of the film 20 becomes higher than that of the film 20, and the amount of the lump of the talumi 102 decreases. This state continues until there is a switch ON output signal from the limit switch 82. In this way, the apparatus can form the talumi 102 having an approximately constant range of talmi amount without synchronizing the motor 44 for driving the discharge roller 36 and the motor 42 for driving the main roller 28. it can.

In this way, the film 2 on the main roller is
U-shaped tarumi 100 and 102 are formed before and after 0 and the film 20 is conveyed. Then, the film 20 which has been exposed and recorded is sent by an extra amount by a predetermined length, and is sent by the cutter 34.
Is cut by. Therefore, if the next exposure is performed in this state, the film is wasted. Therefore, the motor 65 attached to the roll film 24 (see FIGS. 1 and 4 described later)
Is once rotated in the reverse direction to rewind the excessively fed film 20. At this time, the introduction roller 26 is O
It is FF.

In this embodiment, when the motor 65 is rotated in the reverse direction, the remaining film amount of the roll film 24 is detected. A functional block diagram of this remaining amount detecting device is shown in FIG. In this case, the first control means 90 is also connected to the motor 65. First computing means 75
Determines the time required for the Talumi amount to change from the lower limit value to the upper limit value or from the upper limit value to the lower limit value based on the detection signal of the limit switch 80. Then, the second calculation means 7
6 determines the remaining amount of the film based on this time and the speed of the roll film 24 controlled by the first control means 90.

Here, the operating principle of this apparatus will be described.
First, as shown in FIG. 2a, the state in which the talumi 100 is formed on the film 20 is a state in which the roll film 24 and the main roller 28 are constant pulleys, and the talumi 100 that moves in a constant shape is a movable pulley. I assume. In this case, if the principle of the pulley is used, the calculation formula of Δm≈2A is established between the movement distance A of the Talumi and the feed length Δm of the film 20. In this figure, r ₀ is the guide 7
The radius is 0, and r ₁ is the radius when the Talumi 100 is a dotted line portion. Δm is the difference m ₁ −m ₀ between the path length m ₀ of the film 20 at the dotted line portion and the path length m ₁ when the Talumi 100 moves by the distance A from the dotted line portion.

Here, Δm (approximate value) obtained by calculation and the actual feed length Δm 'obtained by experiment
The relationship with (experimental value) is shown in FIG. 2b. The difference between Δm (approximate value) and Δm ′ (experimental value) is the error δ. As shown in the figure, the error δ is small and Δm is almost equal to 2A. Therefore, as assumed above, it may be considered that the movement distance A of the Talumi and the feed amount m of the film 20 have a relationship of m≈2A.

Due to this relationship, the distance 2 in which Talumi moves
If the time required for A is measured, it is possible to calculate the feed amount m of the film 20 during the measurement time, that is, the transport speed of the film 20. This transport speed is the rotational angular velocity of the roll film 24, and since the rotational angular velocity of the film 20 and the roll outer diameter of the roll film 24 are proportional, the roll outer diameter of the roll film 24 at that time can be obtained. This device is based on the above principle.

FIG. 3 is a flow chart showing the operation of this device. The operation of this device will be described below with reference to FIGS.

When the exposure of the film 20 is completed, the motor 65 and the motors 40, 42 and 44 are stopped. In this state, the detection of the remaining film amount of the roll film 24 is started (step S1). First, the motor 42 is reversely rotated to reversely feed the film 20 on the main roller 28 (step S2). Talmi 1 at the end of exposure
I can't tell if the current state of 00 is ON or OFF. Therefore, the film 20 is reversely fed along the guide 70 to forcibly form the talumi 100.

Next, it is confirmed whether or not the limit switch 80 is turned off (step S3). If it is not OFF, the process returns to step S2. Limit switch 80 is OF
When it becomes F and the tarumi 100 reaches the upper limit value, the motor 65 is driven in the high speed mode to rewind the film 20 (step S4). Next, the limit switch 80
It is confirmed whether or not it has become N (step S5). If it is not ON, the process returns to step S4. When the limit switch 80 is turned on and the tarumi 100 reaches the lower limit value, the first calculating means 75 and the second calculating means 76 calculate the remaining film amount (step S6).

In step S6, the first calculation means 7
5 calculates the time (mode switching time) required for the limit switch 80 to switch from OFF (upper limit value of Talumi 100) to ON (lower limit value of Talumi 100). The second calculating means 76 determines the roll film 24 based on the mode switching time and the speed of the motor 65 in the high speed mode.
The current winding outer diameter of is calculated and the remaining amount is detected.

The calculation formula of the remaining amount will be described with reference to FIG.
Note that the film transport speed of the main roller 28 is V, the rotational angular speed of the roll film 24 (high speed mode) is B _H , the rotational angular speed of the roll film 24 (low speed mode) is B _L ,
The mode switching time (high-speed mode) is M _H , the mode switching time (low-speed mode) is M _L , the set movement distance of Talumi (distance between ON and OFF of the limit switch 80) is A, the outer diameter of the roll core is R0, Let R be the outer diameter of the current roll film 24, T be the thickness of the film 20, and L be the remaining film amount of the roll film 24.

In the high speed mode, the following relational expressions are established.

From 2 × A = (R × B _H −V) × _MH , R = (V × _MH + 2 × A) / (B _H × _MH ) (4) On the other hand, L = π × (R ²⁻ R ₀ ² ) / T (5) Therefore, by substituting the expression (4) into the expression (5), L = π × ((V × _MH + 2 × A) ² −R ₀ ² × B _H ² × _MH ² ) / (T × B _H ² × _MH ² ) (6) In the low speed mode, the following relational expression similarly holds.

[0052] L = π × ((V × M L -2 × A) 2 -R 0 2 × B L 2 × M L 2) / (T × B L 2 × M L 2) (7) Here, R ₀ , T, A, V, _BL and _BH are set to constant values. Therefore, the remaining film amount L of the roll film 24 can be detected by measuring the mode switching time M _H or M _L and giving each measured value to the formula (6) or (7).

Thus, the tarmi 100 of the film 20
By using an apparatus for forming the film in a substantially constant range, the remaining film amount L of the roll film 24 can be easily detected.

In this embodiment, the remaining amount is detected when the film 20 is rewound, but the remaining amount may be detected when the film is fed. Further, the above-mentioned high speed mode or low speed mode can be freely set. Further, either the time required for the Talumi amount to change from the upper limit value to the lower limit value or the time required for the Talumi amount to change from the lower limit value to the upper limit value can be freely used.

[0055]

According to the remaining amount detecting device of the photosensitive material (film) in the flatbed scanning image recording apparatus of the present invention, the first computing means outputs the detection signal of the sensor (limit switch) for detecting the amount of the salient of the photosensitive material talmi. Based on this, the time required for the Talumi amount to change from the lower limit value to the upper limit value or from the upper limit value to the lower limit value is obtained. The second calculation means calculates the remaining amount of the sensitive material of the sensitive material roll based on the time calculated by the first calculation means and the speed of the sensitive material roll controlled by the control means. Therefore, the remaining amount of the sensitive material can be easily detected by using the device for forming the sensitive material tarmi in a substantially constant range as it is.

[Brief description of drawings]

FIG. 1 is an image setter 18 according to an embodiment of the present invention.
The functional block diagram of the film remaining amount detection apparatus of (planar scanning image recording apparatus) is shown.

FIG. 2 is a diagram showing a formation state of a tarumi 100.

FIG. 3 is a view showing a flowchart of the operation of the remaining film amount detecting apparatus according to the embodiment of the present invention.

FIG. 4 is a partial perspective view for explaining film remaining amount detection.

FIG. 5 is an image setter 18 according to an embodiment of the present invention.
FIG.

FIG. 6 shows a schematic cross-sectional view of an imagesetter 18.

FIG. 7 shows a functional block diagram of an apparatus for forming the tarumi 100 in a substantially constant range.

FIG. 8 is a diagram showing a state in which a tarumi 100 is formed.

FIG. 9 is a diagram showing a state in which the amount of tarumi of the tarumi 100 is detected.

FIG. 10 is a diagram showing an operating state of a limit switch 80.

FIG. 11 is a diagram showing a state in which a talumi 102 is formed.

FIG. 12 is a diagram showing a state in which the amount of tarumi of the tarumi 102 is detected.

FIG. 13 is a diagram showing an example of a conventional planar output scanner.

FIG. 14 is a diagram showing a state in which the remaining film amount of a conventional roll film is detected.

FIG. 15 is a diagram showing another state in which the remaining film amount of a conventional roll film is detected.

[Explanation of symbols]

 20 ... Film (sensitive material) 24 ... Roll film (sensitive material roll) 26 ... Introduction roller 28 ... Main roller 65 ... Motor 75 ... First computing means 76 ... Second computing means 80 ... Limit switch (sensor) 90 ... First control means 100 ... Tarumi

Claims (1)

[Claims] 1. A sensitive material roll in which a sensitive material is wound in a roll shape, a main roller for sandwiching the sensitive material fed from the sensitive material roll between a nip roller and conveying the sensitive material in a sub-scanning direction, and a sub roller. An optical system that scans a light beam in a main scanning direction substantially orthogonal to the scanning direction to expose and record a duplicate image on a photosensitive material conveyed by the main roller at a constant speed, and the photosensitive material roll and the main roller. A sensor for detecting the upper limit value and the lower limit value of the Talumi amount of the photosensitive material Talumi formed between, based on the detection signal of the sensor, so as to reduce the Talmi amount when the Talmi amount reaches the upper limit value, When the Talumi amount reaches the lower limit value, the Talmi amount is increased,
A planar scanning image recording device comprising: a control unit for controlling the speed of the photosensitive material roll; and a device for detecting the residual amount of the photosensitive material of the photosensitive material roll, wherein: First computing means for determining the time required for the amount of Talumi to change from the lower limit value to the upper limit value or from the upper limit value to the lower limit value, and the time determined by the first computing means and the feeling of being controlled by the control means. A remaining amount detecting device for a sensitive material in a flat scanning image recording device, comprising: a second calculating means for obtaining the remaining amount of the sensitive material based on the speed of a material roll.