JPS62191355A - Detecting device for remaining sensitive material - Google Patents

Abstract

PURPOSE:To enable the change in remainings to be continuously detected without any particular modification made on rolled sensitive materials and a magazine itself by providing a means for detecting the quantity of displacement of a magazine support means so as to detect the weight of remaining sensitive materials whereby providing a means for indicating the result of said detection. CONSTITUTION:Accompanied with use of an image scanning read/record device, a rolled sensitive material in a magazine 32 is pulled out to the direction B by way of a sensitive material take-out port 38 so as to be fed to an image record section. As a result, the rolled sensitive material in the magazine 32 decreases in weight, then both a magazine table 46 and a rotating member 48 are rotated to the direction C about a pivot 44 by means of repulsive force of coil springs 58a and 58b. In this case, as a gear 66 fixed on the rotating shaft 64 of No.1 variable resistor 62 is meshed with the gear section 56 of the rotating member 48, a movable contact shoe connected with the rotating shaft 64 rotates while sliding on a resistor accompanied with the rotation of the rotating member 48. And as the movable contact shoe rotates, the resistance value of the variable resistor 62 varies for changing the indicated value of an indicator 78 depending on the rotational displacement of the rotating member 48.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting the remaining amount of a predetermined object in an analog manner based on weight, and more specifically, for example, when a rolled photosensitive material stored in a magazine is pulled out from the magazine and used. When a roll of photosensitive material is pulled out, the remaining amount of the roll of photosensitive material in the magazine can be detected without visually checking it by utilizing the fact that the weight of the remaining amount of the roll of photosensitive material in the magazine decreases as the amount of the roll of photosensitive material is pulled out. The present invention relates to a remaining amount detection device for a photosensitive material configured to do so.

In recent years, in the fields of printing and plate making, image scanning reading and recording devices that create film master plates by electrically processing image information drawn on manuscripts have become widespread in order to streamline work processes and improve image quality. It is used.

This image scanning reading/recording device basically consists of an input section, a control section, and an output section. This type of image scanning reading/recording device operates as follows. That is, the input section scans a document such as a photograph or a line drawing with a laser beam or the like, and converts image information of the document into an electrical signal according to the intensity of reflected light. Next, the image information photoelectrically converted by the input section is subjected to arithmetic processing such as gradation correction and halftone separation according to the plate-making conditions in the control section. Then, the image information processed by the control section is converted into an optical signal such as a laser beam again at the output section, and the optical signal is irradiated onto the photosensitive material to record a desired image. Further, the photosensitive material after the completion of image recording is subjected to a development process and then used as a film original plate for printing or the like.

In this case, generally, the photosensitive material used is a so-called roll photosensitive material wound into a roll, and this roll photosensitive material is stored in a magazine and placed at a predetermined location in the image scanning reading/recording device. loaded. That is, the rolled photosensitive material is pulled out of the magazine through a photosensitive material outlet provided in the magazine by a photosensitive material pull-out mechanism consisting of rollers, etc., and then this rolled photosensitive material is exposed to laser light or the like as described above. After that, it is cut to a predetermined length.

In this case, the amount of roll photosensitive material remaining in the magazine decreases as the amount of roll photosensitive material used increases. Therefore, in order to avoid a situation where the roll photosensitive material is no longer fed to the image recording section, it is necessary to finally load the magazine in which the roll photosensitive material is stored outside the magazine. For this reason, it is desirable to detect the remaining amount of rolled photosensitive material in the magazine.

However, according to the prior art, in order to prevent the rolled photosensitive material inside the magazine from being exposed to external light, the magazine and the casing of the image scanning recording device are made of a light-shielding member. It is not possible to directly visually check the presence or absence of a roll of sensitive material.

Therefore, conventionally, in order to detect when the remaining amount of the roll photosensitive material is low, for example, as shown in FIG. has been adopted. In this case, the mark 4 is attached to a position close to the winding center axis of the roll photosensitive material 2, that is, near the end of the roll photosensitive material 2. Therefore, by discovering the mark 4 on the roll photosensitive material 2 that has been pulled out from the magazine and subjected to development processing, it is possible to confirm that the remaining amount of the roll photosensitive material in the magazine is small.

In this case, the roll photosensitive material 2 at the time when the mark 4 is visually recognized
However, it is impossible to constantly check the remaining amount of the roll photosensitive material 2.

Therefore, it is not possible to predict the appropriate time to replace the magazine. In addition, a roll sensitive material 2 may be used instead of the marker 6.
There is also a method of providing a cut mark 6 as shown in FIG. 1 at a predetermined part of the roll, but in this case as well, as with the case of using the mark 4, it is not possible to always know the remaining amount of the roll photosensitive material. . Furthermore, in order to use the mark 4 or the cut mark 6 in this way, it is necessary to attach the mark 4 to the roll photosensitive material 2 or provide the cut mark 6 in advance, and this work is complicated. There is a disadvantage that it is.

Furthermore, a remaining amount detection mechanism 8 as shown in FIG. 2 has also been devised. In other words, this remaining amount detection mechanism 8 detects the magazine 10.
A spring 12 having one end fixed to the spring 12, and a rotating rod 14 fixed to the other end of the spring 12,
The spring 12 urges the rotating rod 14 to rotate in the direction of arrow A. A plate 16 is fixed to the intermediate portion of the rotary rod 14, and furthermore, the tip side of the rotary rod 14 rotatably projects from the magazine 10, and a pointer 18 is fixed to the tip.

A scale member 19 is disposed adjacent to the pointer 8. On the other hand, the rolled photosensitive material 2 provided inside the magazine 10 is wound around a shaft 20, and this shaft 20 is pivotally supported on the side wall of the magazine 10.

In this case, the front end side of the roll photosensitive material 2 is connected to the magazine 10.
It is led out to the outside from a photosensitive material outlet 22 formed in the plate body 16), and is configured to come into contact with the lower part of the roll photosensitive material 2 by the biasing action of the spring 12.

In the above configuration, the roll photosensitive material 2 is connected to the photosensitive material outlet 22.
When the rolled photosensitive material 2 is pulled out to the outside of the magazine 10 via the shaft 20, the amount of the rolled photosensitive material 2 wound around the shaft 20 decreases in accordance with the amount of the pulled out. That is, as the diameter of the roll photosensitive material 2 wound around the shaft 20 decreases as the amount of the roll photosensitive material 2 is used, the plate 16 that is in contact with the lower part of the roll photosensitive material 2 becomes smaller due to the force of the spring 12. Rotates in six directions indicated by arrows under bias. Therefore, the pointer 18 integrated with the plate body 16 is rotationally displaced in the direction of arrow A, and as a result, the operator can read the scale on the scale member 19 indicated by the pointer 18 to feel the roll after loading the magazine. You can know the changes in the remaining amount of material.

However, in such a configuration, it is necessary to provide the magazine 10 with a remaining amount detection mechanism 8 consisting of a spring 12, a rotating rod 14, a plate 16, etc., and as a result, the magazine 10 itself becomes complicated and expensive. Furthermore, since the remaining amount of the rolled photosensitive material is attempted to be detected by a decrease in the radial length of the material, it is not direct, and the detection result is unreliable.

Other methods for detecting the remaining amount of roll sensitive material include:
A method has also been devised in which a relatively narrow window is provided in the side wall of the magazine, and the amount of roll photosensitive material remaining in the magazine is confirmed by optical means through this window. Of course,
In this case, the window must be light-tightly closed until the magazine is loaded into the image scanning reading/recording device, and the window must be opened after loading the magazine. Therefore, a mechanism for opening and closing the window is required, and in addition, a structure is required that prevents external light from entering the window and exposing the roll sensitive material inside the magazine before the magazine is loaded. There is a disadvantage that it is difficult to prevent exposure to light.

Furthermore, there is also a method in which a tension lever is provided in sliding contact with the upper surface of the rolled photosensitive material that is pulled out from the magazine with a predetermined tension, and whether or not the rolled photosensitive material remains is detected by the displacement of this tension lever. That is, when all of the rolled photosensitive material is led out from inside the magazine, the tension lever that was in sliding contact with the upper surface of the rolled photosensitive material is lowered in the vertical direction. Therefore, by detecting such downward displacement of the tension lever, it is possible to know whether or not there is any rolled photosensitive material remaining in the magazine. However, according to this method, it is impossible to continuously or step-by-step detect the amount of roll photosensitive material remaining in the magazine, and therefore it is impossible to predict when the magazine will be replaced. , it is difficult to quickly replace the magazine.

The present invention has been made in order to overcome the above-mentioned disadvantages, and focuses on the fact that the weight of the roll photosensitive material in the magazine changes with the amount of roll photosensitive material used as a member to be led out. By displaying changes in the weight of the roll of photosensitive material, there is no need to perform any special processing on the roll of photosensitive material or the magazine itself, and it is possible to continuously detect changes in the remaining amount of the roll of photosensitive material. The purpose of the present invention is to provide a remaining amount detection device.

To achieve the above object, the present invention provides a device for detecting the remaining amount of photosensitive material stored in a light-shielded magazine, which supports the magazine and detects the amount of photosensitive material in the magazine decreasing. The present invention is characterized by comprising a displacing support means, a weight detection means for detecting the weight of the remaining photosensitive material by detecting the amount of displacement of the support means, and a display means for displaying the detected weight.

Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 3 and FIGS. 4a and 4b, reference numeral 30 indicates a photosensitive material remaining amount detection device according to the first embodiment of the present invention. It is used to detect the remaining amount of the roll photosensitive material 34 (see FIGS. 4a and 4b) as a material. Roll sensitive material 34
is wound around a shaft 36 that is pivotally supported on the side wall of the magazine 32, and the tip end of the rolled photosensitive material 34 is passed through the magazine 3 through a photosensitive material outlet 38 (see FIG. 3) provided in the magazine 32.
Extending to the outside of 2. Therefore, the remaining amount detecting device 30 includes a tilting mechanism 40 as a supporting means that is displaced in accordance with the amount of nog of the rolled window material 34 in the magazine 32, and a weight detecting device by detecting the amount of displacement of the tilting mechanism 40. A displacement detection mechanism 42 is provided.

The tilting mechanism 40 includes a support shaft 44 that is pivotally supported inside a casing (not shown) of the image scanning reading/recording device, a magazine receiver 46 that is integrally rotatable around the support shaft 44,
It includes a rotating member 48 and a support member 50. The magazine 32 is placed on the magazine receiver 46 as shown in the figure,
At this time, plate-shaped locking members 52 and 54 for positioning the magazine 32 are fixed to the upper surface of the magazine receiver 46 parallel to each other and separated by a predetermined distance. The magazine receiver 4
A support member 50 is fixed to one end of the magazine receiver 4.
A substantially fan-shaped rotating member 48 is fixed to the other end of the rotating member 6 . A tooth portion 56 is formed in the arc-shaped portion of the rotating member 48 . Furthermore, the support shaft 44 is inserted through the rotating member 48 and the support member 50, and coil springs 58a and 58b are fitted around the support shaft 44. Both ends of each of the coil springs 58a and 58b extend linearly, one end of which comes into contact with the lower surface of the magazine receiver 46, and the other end of which is held at a predetermined position via stopper members 60a and 60b. Fixed. In this case, the coil spring 5
The rotating force in the direction of arrow C is generated in the magazine receiver 46, the rotating member 48, and the supporting member 50 by the biasing action of 8a and 58b.

On the other hand, the displacement detection mechanism 42 includes a rotary first variable resistor 62 that is disposed near the rotary member 48 as a potentiometer. The tip of the rotary shaft 64 protruding from the first variable resistor 62 has teeth 5 of the rotary member 48.
A gear 66 meshing with 6 is fixed. The first variable resistor 62 also has terminals 68 and 70 connected to both ends of a resistor (not shown), and a terminal 72 connected to a movable contact (not shown) that interlocks with the rotating shaft 64. It is provided. In this case, an electrical circuit configured via the terminals 68, 70 and 72 is configured to detect the amount of rotational displacement of the gear 66 and rotating shaft 64. Various configurations can be selected for the electric circuit, but for example, as shown in the figure, the negative electrode side of a constant voltage DC power source 74 is connected to the terminal 68, and the positive electrode side of this power source 74 is further branched into two. One of the signal lines is connected to the terminal 70 via a second variable resistor 76. The other of the branched signal lines is connected to the terminal 72 via a display 78 consisting of an ammeter.

The photosensitive material remaining amount detection device 30, which is the first embodiment of the present invention, is basically configured as described above.
Next, its action and effects will be explained.

First, as shown in FIG. 4a, a constant weight roll photosensitive material 34 is
The magazine 32 in which is stored is placed on the magazine receiver 46. At this time, the magazine 32 is positioned by the locking members 52 and 54. In this case, the magazine receiver 46, the rotating member 48, and the supporting member 50 rotate in the direction of the arrow about the support shaft 44 due to the weight of the magazine 32 and the rolled photosensitive material 34, and the coil springs 58a, 58b (see FIG. 3) It stops at a predetermined angle under the action of. That is, in the initial state in which the roll photosensitive material 34 is not being fed to the image recording section, the amount of rotational displacement of the rotating member 48 in the direction of the arrow is the largest, and at this time, the display on the display 78 indicates the predetermined maximum value. The resistance values of the variable resistors 62 and 76 of the electric circuit are set in advance so as to be a reference value.

Next, magazine 3 is used as an image scanning recording device.
The roll photosensitive material 34 in 2 is the photosensitive material outlet 38 (see Figure 3).
, and is pulled out in the direction of arrow B. As the rolled photosensitive material 34 is pulled out and fed to the image recording section in this way, the weight of the rolled photosensitive material 34 in the magazine 32 is reduced, and as a result, the spring force of the coil springs 58a and 58b is reduced. Then, the magazine receiver 46 and the rotating member 48 rotate in the direction of arrow C around the support shaft 44 (see FIG. 4). At this time, since the gear 66 fixed to the rotating shaft 64 of the first variable resistor 62 (see FIG. 3) is engaged with the teeth 56 of the rotating member 48, as the rotating member 48 rotates, A movable contact (not shown) connected to the rotating shaft 64 rotates while slidingly contacting a resistor (not shown). As the movable contactor rotates, the resistance value of the first variable resistor 62 changes, and the displayed value of the indicator 78 changes in response to the amount of rotational displacement of the rotating member 48. That is, by reading the displayed value on the display 78, the operator can know the change in the amount of roll photosensitive material 34 remaining in the magazine 32. Therefore, in practice, by determining in advance the correspondence between the change in the remaining amount of the roll photosensitive material 34 and the change in the displayed value on the display 78, it is possible to easily grasp the remaining amount of the roll photosensitive material 34. becomes. Therefore, if the remaining amount of the roll photosensitive material 34 is extremely small (and the display on the indicator 78 reaches a predetermined minimum reference value), a new magazine containing unused roll photosensitive material is loaded immediately. Please do the appropriate work.

Next, a remaining amount detection device 80, which is a second embodiment of the present invention, will be described with reference to FIG. In addition, in the following description, the same reference numerals as above indicate the same components.

The remaining amount detection device 80 includes a swing mechanism 82 and a displacement detection mechanism 84.
It consists of As in the first embodiment, locking members 52 and 54 are fixed to the upper surface of a magazine receiver 86 constituting the swing mechanism 82 as a support means. Further, an arm member 88 is fixed to one end of the magazine receiver 86, and a support member (not shown) similar to the support member 50 in the first embodiment (see FIG. 3) is fixed to the other end of the magazine receiver 86. be done. In this case, a support shaft 44 is inserted through one end of each of the support member (not shown) and the arm member 88, and this support shaft 44 is pivotally supported within a casing (not shown) of the image scanning reading/recording apparatus. Furthermore, one end portion of a coil spring 90 is engaged in the middle of the arm member 88, and the other end portion of this coil spring 90 is fixed to a predetermined upper portion of the casing (not shown). That is, the configuration is such that a rotational displacement force in the direction of arrow C about the support shaft 44 is generated in the arm member 88 and the magazine receiver 86 under the tension of the coil spring 90. Furthermore, a magnet 92 as a magnetic member is fixed to the other end of the arm member 88.

On the other hand, the displacement detection mechanism 84 is basically configured as follows.

Light emitting diodes 94a to 94c as display elements are connected in parallel to the positive electrode side of the DC power supply 74, and one ends of reed switches 96a to 96c are connected to these light emitting diodes 94a to 94C. The other ends of the reed switches 96a to 96c are connected to the negative electrode side of the DC power supply 74. In this case, the reed switches 96a to 96c
are provided along the movement path of the magnet 92, which will be described later.

In the above configuration, when the magazine 32 containing the rolled photosensitive material 34 of a constant weight is placed on the magazine receiver 86 as shown in the figure, the magazine receiver 86 and the arm member 88 are integrated around the support shaft 44. It rotates in the direction indicated by the arrow and stops at a predetermined position under the tension of the coil spring 90. In this case, the magnet 92 is close to the reed switch 96a, and the reed switch 96a is operated under the influence of the magnetic field of the magnet 92 to be in the closed state. Therefore, the light emitting diode 94
A is energized and lights up.

Next, as the roll photosensitive material 34 is used, the weight of the roll photosensitive material 34 in the magazine 32 decreases, and as a result, the arm member 88 rotates in the direction of arrow C around the support shaft 44, and the magnet 92 moves upward. Displaced to.

Therefore, the reed switch 96a becomes open,
The light emitting diode 94a turns off. Then, the reed switch 96b that receives the magnetic force of the magnet 92 is closed, and as a result, the light emitting diode 94b lights up. That is, as the magnet 92 is rotated in the direction of arrow C, the light emitting diodes 94a to 94c will blink in sequence, and the operator can remove the remaining part of the roll photosensitive material 34 by simply checking the blinking state of the light emitting diodes 94a to 94C. You can roughly know the amount. Note that if the displacement amount detection mechanism 84 is configured so that the light emitting diodes and reed switches are provided in more stages than shown in the figure, changes in the remaining amount of the roll photosensitive material 34 can be detected more accurately and continuously. Of course it will.

Next, FIG. 6 shows a schematic configuration of a remaining amount detecting device 100 according to a third embodiment.

The remaining amount detecting device 100 includes a moving mechanism 102 as a support means that moves up and down depending on the remaining amount of the roll photosensitive material 34, and a variable resistor 104 forming a weight detecting means. The magazine receiver 106 constituting the moving mechanism 102 has both ends bent and provided with locking portions 108 and 110. Furthermore, guide rods 112a to 112d extending vertically are fixed to the lower surface of the magazine receiver 106.

In addition, through holes 116a to 116d are formed in the plate-shaped guide member 114, and the guide member 114 is fixed to a predetermined location within the casing (not shown). Coil springs 118a to 118d are fitted onto the guide rods 112a to 112d, and these guide rods 112a to 112d are fitted into the through holes 116a.
116d through 116d in a slidable manner.

On the other hand, a vertically extending connecting member 120 is fixed to the end of the magazine receiver 106, and the lower end of this connecting member 120 is fixed to a slide lever 122 of a direct-acting variable resistor 104 constituting a potentiometer. be done. In addition,
In this case, the variable resistor 104 is fixedly arranged at a predetermined location within the casing (not shown). Further, an electric circuit similar to that in the first embodiment is provided using the variable resistor 104, and a display (not shown) corresponding to the display 78 in the first embodiment is attached.

In this configuration, the magazine 32 containing the rolled photosensitive material 34 is placed on the magazine receiver 106 so as to be positioned between the locking portions 108 and 110. At this time, the guide rods 112a to 112d slide vertically downward in the through holes 116a to 116d of the guide member 114 due to the weight of the magazine 32 and the roll sensitive material 34, and the magazine receiver 106 is moved under the action of the coil springs 118a to 118d. stops at a predetermined position. And magazine 3
When the rolled photosensitive material 34 in the magazine 32 is pulled out, the magazine receiver 106 is vertically displaced upward under the force of the coil springs 118a to 118d as the weight of the rolled photosensitive material 34 in the magazine 32 decreases. At this time, since the slide lever 122 integrated with the magazine receiver 106 via the connecting member 120 is displaced upward in the vertical direction, the resistance value of the variable resistor 104 changes. The change in the resistance value of the variable resistor 104 is shown by a display (not shown), and the operator can know the change in the remaining amount of the roll photosensitive material 34 by reading the displayed value on the display. I can do it.

As described above, according to the present invention, it is possible to detect the remaining amount of roll photosensitive material stored in a magazine without directly observing it visually. Moreover, since the remaining amount detecting device of the present invention is configured to detect the remaining amount of the roll photosensitive material by effectively utilizing changes in the weight of the roll photosensitive material, unlike conventional methods, it is possible to detect the remaining amount of the roll photosensitive material or the magazine. There is no need for special processing. Furthermore, since it is possible to continuously detect changes in the amount of roll photosensitive material remaining, it is possible to roughly predict when the roll photosensitive material in the magazine will run out. It is possible to load a new magazine containing unused rolls of sensitive material at an appropriate time without suddenly stopping the machine. Further, since the remaining amount detecting device of the present invention has a simple configuration, the detecting device can be provided at a low cost. Furthermore, since the display corresponding to the remaining amount of the roll photosensitive material can be configured to be displayed using an electrically operated display, various effects such as being able to freely select the position where the display is provided can be obtained. is obtained.

Although the present invention has been described above with reference to preferred embodiments, it is not limited to the present invention 1 and other embodiments. It is also possible to configure the system to indicate the remaining amount of the optical material by the rotational displacement of a mechanically connected pointer, and a displacement detection device such as an encoder can be used in place of the variable resistor. It goes without saying that various improvements and changes in design can be made without departing from the gist of the present invention.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a roll photosensitive material used to explain the remaining amount detection method according to the prior art, FIG. 2 is a schematic perspective view of the remaining amount detection mechanism according to the prior art, and FIG. A schematic perspective view of a photosensitive material remaining amount detection device according to an embodiment, FIG. 4a, and a partially omitted side view showing a displacement state of the photosensitive material remaining amount detection device according to the first embodiment , FIG. 5 is a schematic side view of a remaining amount detection device for a photosensitive material, which is a second embodiment of the present invention, and FIG. 6 is a schematic side view of a remaining amount detection device for a photosensitive material, which is a third embodiment of the present invention. It is a perspective view with some parts omitted. 30...Remaining amount detection device 32...Magazine 3
4... Roll sensitive material 40... Tilt mechanism 42
...Displacement detection mechanism 44...Spindle 46...
Magazine receiver 48... Rotating member 62... Variable resistor 78... Indicator 80... Remaining amount detection device 82... Rocking mechanism 84... Displacement detection mechanism 86... Magazine Receptacle 88... Arm member 92... Magnet 96a-96c... Reed switch 100... Remaining amount detection device 102... Moving mechanism 104... Variable resistor 106... Magazine receiver 112a-112d ...Guide Rondo 114...
Guide member 104... Variable resistor patent applicant Fuji Photo Film Co., Ltd. f 3゜FIG, 4b

Claims (6)

[Claims] (1) A device for detecting the remaining amount of photosensitive material stored in a light-shielded magazine, comprising a support means that supports the magazine and is displaced as the amount of photosensitive material in the magazine decreases, and the support means weight detection means for detecting the weight of the remaining photosensitive material by detecting the amount of displacement;
A remaining amount detection device for a photosensitive material, comprising: display means for displaying the detected weight. (2) In the device according to claim 1, the support means includes a magazine holder that is rotatable about a support shaft and rotates under the biasing action of an elastic body, and the weight detection means is configured to detect the magazine. What is claimed is: 1. A residual quantity detection device for photosensitive material, comprising a variable resistor having a movable contact that engages with a receiver, and configured such that the resistance value of the variable resistor changes as the magazine receiver rotates. (3) In the device according to claim 1, the support means includes a magazine support that is oriented in a substantially vertical direction and is linearly displaced under the biasing action of an elastic body, and the weight detection means is arranged in the magazine support. A remaining amount detection device for photosensitive material, comprising a variable resistor having a movable contact connected to the magazine receiver, the resistance value of the variable resistor changing as the magazine holder is displaced. (4) In the device according to claim 2 or 3, the display means includes a display device that applies a constant voltage to a variable resistor and displays a display corresponding to the amount of current flowing through the variable resistor. . A remaining amount detection device for a photosensitive material, which is configured to detect a change in the resistance value of the variable resistor using the indicator. (5) In the device according to claim 2 or 3, the weight detection means includes a magnetic member that is displaced integrally with the magazine holder, and a plurality of weight detection means arranged along the displacement path of the magnetic member. and a reed switch, and each reed switch is configured to open and close as the magnetic member is displaced. (6) In the apparatus according to claim 5, a display element is connected to each reed switch, and the display element is configured to display in stages the state of decrease of the photosensitive material in the magazine. A device for detecting the remaining amount of photosensitive material.