JP2971591B2 - Recording medium playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium reproducing apparatus, and more particularly, to a transport structure for a recording medium such as a recording sheet subjected to reproduction processing.

[0002]

2. Description of the Related Art Recording paper used for so-called copying, printing and the like carries a visible image by adhering ink or toner to the surface thereof, and functions as a recording medium. By the way, such recording paper is made from pulp as a raw material, but in recent years, it has been proposed to reuse it in terms of resource conservation. That is, as a method of performing the above-described reuse, in a case where recording paper using deinkable ink and recording paper using non-deinkable ink are mixed, ink that can be deinked is used. There is a method of selecting and collecting used recording paper, converting it into fiber, and regenerating it. On the other hand, apart from such a reproduction process, it has been proposed to use a developer having a deinkable toner as a main part and to erase the toner to obtain a reproduced recording sheet.

[0003]

By the way, the recording paper reproduced by the latter method is set in the paper feeding section of the printing apparatus and is again subjected to printing, but the recording paper discharged from the reproduction processing section is used. In some cases, printing material that has not been subjected to reprocessing is attached to the recording paper, and such recording paper is discharged and stored in the same manner as regenerated recording paper. Identification is required, and there is a risk that the printing operation takes time. Further, even in the case of a recording sheet having a printing portion using a renewable material, for example, the printing amount is large, and the printing portion may not be completely erased in one reproduction process. Even in this case, identification is required as in the case described above. Furthermore, when the background density of the recording paper is high, even if the printed portion is erased and reproduced, for example, if this is detected by a density sensor or the like, it may be erroneously determined that it cannot be reused. There is. In addition, when detecting whether or not the density sensor can be reused by using the above-described density sensor, it is sometimes desired that accurate determination can be performed even if the number of density sensors is reduced. SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording paper reproducing apparatus capable of accurately and promptly reproducing a recording paper when using the above-described conventional reproduction-processed recording paper. It is a further object of the present invention to provide a recording paper reproducing apparatus in which the density detecting means used for grasping the reproducing state can have a simple structure.

[0004]

In order to achieve this object, the invention according to claim 1 comprises means for feeding a printed recording medium obtained by a printing device, and erasing a printed portion on the recording medium. A recording medium reproducing apparatus comprising: a reproduction processing unit that reproduces the recording medium; a unit that stores a reusable recording medium among the recording media after the reproduction processing; and a unit that collects a non-reusable recording medium. In the transport path of the recording medium discharged from the reproduction processing means, the recording medium is transported at a position branched to a means for storing the reusable recording medium and a means for collecting the non-reusable recording medium. Means for switching and setting a path, means for detecting the density of the reproduction surface of the recording medium provided on the introduction side and discharge side of the recording medium with respect to the reproduction processing means, and the density detection means on the input side. A control unit connected to the output side, wherein the control unit compares the detection result from the density detection unit, and according to the result, the control unit switches the conveyance path switching unit. It is characterized by setting a posture.

According to a second aspect of the present invention, in the recording medium reproducing apparatus according to the first aspect, the control unit controls the density of the recording medium before reproduction (D ₁ ) and the density of the recording medium after reproduction (D ₂ ). relationship with is is characterized in that in the case of satisfying the relationship of D ₁ -D ₂ ≦ 0, drives the conveyance path switching means to guide the recording medium to the collecting means.

According to a third aspect of the present invention, there is provided means for feeding a printed recording medium obtained by a printing apparatus, reproduction processing means for erasing and reproducing a printed portion on the recording medium, Means for storing a reusable recording medium among the recording media, means for collecting a non-reusable recording medium, and sending the discharged recording medium to the reproduction processing means again
A recording medium reproducing apparatus having a retransmission means, Te conveying path smell of the recording medium discharged from said reproduction processing means
Means for setting switching the conveying path of the provided in the recording medium at a position which is branched into a unit and the retransmission unit for upper Symbol storage, provided in the introduction side and the discharge side of the recording medium to said reproducing processing means, Means for detecting the density of the reproduction surface of the recording medium; and a control unit in which the density detection means is connected to the input side and the transport path switching means is connected to the output side. When the density after reproduction is lower than the density before reproduction, and when the density after reproduction is lower than the reference density when reusable, the recording medium is supplied to the storage means for the reusable recording medium. The transport path switching means is set to the position for feeding, and if the density after reproduction is higher than the reference density, the transport path switching means is set to the position for executing the reproduction process again. It is characterized by:

According to a fourth aspect of the present invention, in the recording medium reproducing apparatus according to the third aspect, the control unit uses the background density of the recording medium as a reference density when reusable.

According to a fifth aspect of the present invention, in the recording medium reproducing apparatus according to the second aspect, the means for detecting the density of the reproducing surface of the recording medium is movable in a direction perpendicular to the transport direction of the recording medium. It is characterized by being provided in.

[0009] According to a sixth aspect of the invention, the means for feeding the printed recording medium obtained by the printing apparatus, a reproduction processing means for reproducing and erasing the print unit on the recording medium, after the reproduction process Means for storing a reusable recording medium among the recording media, means for collecting a non-reusable recording medium, and sending the discharged recording medium to the reproduction processing means again
A recording medium reproducing apparatus having a retransmission means, the re
Feed means and the upper Symbol reservoir hand stage and said recovery means are located on the same side with respect to the reproduction processing unit, the reproduction process
Recording medium before reproduction processing by means and said reproduction processing
On the reproduction surface with the recording medium reproduced by the means
It is characterized in that a means for detecting the density of the same portion is provided, and a conveyance path of the recording medium to each of the means is set in accordance with a detection result by the density detecting means.

[0010]

According to the first, second, fifth and sixth aspects of the present invention, it is possible to detect the density on the reproduction surface of the recording medium which is introduced to and discharged from the reproduction processing means, and classify the recording medium according to its activity. it can. In particular, according to the second aspect of the present invention, when the density after reproduction is high, it is determined that reproduction cannot be performed, and the recording medium is recovered, so that a defective reproduction cannot be reused.

According to the third and fourth aspects of the present invention, the density on the reproducing surface of the recording medium introduced and discharged to the reproducing processing means is detected, and the density after reproduction with respect to the reference density when reusable is possible. If the value is higher, the recording medium is conveyed so that the reproduction processing can be performed again, so that the reproduction processing can be executed again.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a schematic layout diagram for explaining the overall configuration of a recording medium reproducing apparatus (hereinafter, referred to as a recording paper reproducing apparatus for convenience) in the case of recording paper according to a first embodiment of the present invention. .

That is, the recording paper reproducing apparatus 1 shown in FIG.
Is provided on one wall of a housing 1A with a paper feed section 1B for accommodating recording paper S after copying obtained by a printing device such as a copying machine. The above-described paper feeding unit 1B includes a recording paper storage cassette 1B1, a feeding roller 1B2 that can be selectively brought into and away from the leading end of the recording paper S in the cassette 1B1, and a feeding roller.
The recording paper S in the cassette 1B1 is fed out and fed to a reproduction processing unit 1C described later.

On the other hand, the reproduction processing section 1C is provided with a recording paper transport path extending from the upper side to the lower side in the figure, and a meandering path 1Ca for reversing the printing surface of the recording paper is provided in the transport path. It is. Then, the reproduction processing unit 1C
As a toner in the developer used in the copying machine 2, a structure for erasing a printed portion when a toner using a biodegradable plastic is used is provided. 2, a print disassembly processing unit 1C1, a drying unit 1C2, and a cleaning unit 1C3 having the configuration shown in FIG. That is, for example, the print disassembly processing unit 1C1 is extended between the disintegrant storage tank 1C1a, the tank 1C1a, and the recording paper surface on the transport belt 1C1b.
The drying unit 1C2 comprises a far-infrared lamp 1C2a as a heater, a conveyor belt 1C2b, and a steam exhaust fan 1C2c. Accordingly, the recording paper S fed from the paper feeding unit is subjected to the application of the decomposing agent by the decomposing agent applying device 1C1c by setting the conveying speed of the conveying belt 1C1b, and the printing portion on the surface is biodegraded. It is erased, dried in the drying section 1C2, and fed to a cleaning section 1C3 described later. The inside of the print disassembly processing unit 1C1 is controlled by a temperature and humidity sensor 1C1d to control the temperature and humidity for accelerating the disassembly. The setting of the temperature and humidity by the sensor 1C1d is performed by the ultrasonic humidifier 1C1e and The operation is performed by the ceramic heater 1C1f in the transport belt 1C1b facing the non-reproduction processing surface of the recording paper S.

On the other hand, the above-described cleaning unit 1C3
It has a function of removing toner of a printing portion which has been released on the surface of the recording paper by drying. Specifically, a rotary brush 1C3a capable of rubbing the surface of the recording paper, and a surface of the recording paper which comes into contact with the brush 1C3a. To remove toner that has been swept from
Cleaning blade 1C3b and cleaning blade 1C
The rotary brush 1 sandwiches the recording paper S with a toner collecting member 1C3c made of a paddle wheel or a screw body for collecting the toner removed from the rotary brush 1C3a by 3b.
The ultrasonic transducer 1C3d is disposed so as to face the C3a. And the cleaning unit 1C3
The recording paper S that has passed through is discharged to the recording paper storage stacker 1D located on the exit side of the transport path with the printing surface inverted in FIG. 1 and the non-reproduction surface facing upward.

In FIG. 1, the recording paper storage stacker 1D
Among the recording sheets S discharged from the reproduction processing section 1C, a reusable recording sheet storage stacker 1D1 for storing reusable recording sheets S and a discard tank 1D2 for collecting and storing non-reusable recording sheets are provided. And one of them is discard tank 1
At the entrance of the recording paper to D2, a shredder 1D3 is provided to cut the recording paper to be introduced. Therefore, the transport path 1E on the recording paper discharge side from the reproduction processing section 1C branches to the above-described stacker 1D1 for storing recording paper and the discarding tank 1D2, and the swingable first position is located at this branch position. A transport path switching claw 1E1 is provided. The first transport path switching claw 1E1 is set in a rocking position by a solenoid 1E1a that is driven and controlled by a control unit described later, and is set in a normal position, that is, an initial position, for example, to the discard tank 1D2. Is set so that the recording paper can be introduced. Further, the above-described transport path 1E is further branched behind the first transport path switching claw 1E1, one of which is in the above-mentioned stacker 1D1 for storing reusable recording paper, and the other is in the above-mentioned reproduction processing section. It has been extended to 1C.

For this reason, the first transport path switching claw 1E1
A second conveyance path switching claw 1E2 is also provided at a branch position of the conveyance path located behind the second conveyance path. And this nail 1E2
Is a solenoid 1 driven and controlled by a control unit described later.
The rocking position is set by E2a, and the normal position, that is, the initial position, for example, the direction in which the recording paper S can be introduced toward the reproduction processing unit 1C is set. In the drawing, reference numeral 1E3 indicates a feeding roller disposed in the transport path.

On the other hand, as shown in FIG. 4, the main part of the control unit 2 is constituted by a microcomputer 2A, and is connected to an external device via an I / O interface 2B. ing. That is, the I / O interface
The input side of the source 2B is connected to the reflection type photosensors 3 and 4 for density detection, which are disposed on the recording paper introduction position in the reproduction processing unit 1C and on the recording paper discharge side of the reproduction processing unit 1C, respectively. The drive circuit 5 for the solenoid 1E1a for the first transport path switching claw 1E1 and the second
The drive circuit 6 of the solenoid 1E2a for the transport path switching claw 1E2 is connected to each of them.

The photo sensors 3 and 4 described above are similar to those shown in FIG.
As shown in FIG. 5B, the moving direction is a direction perpendicular to the transport direction (St) of the recording paper S, and together with the transport direction of the recording paper S, as shown by a broken line in FIG. A large area can be scanned for density detection over the width direction and the longitudinal direction of the recording paper S. The relationship between the outputs from the photosensors 3 and 4 and the density, in other words, the amount of residual toner, is as shown in FIG. 6, and in FIG. The output is shown to drop.

In the control unit 2 described above, the density (D ₁ ) of the reproduction surface on the recording paper S before the reproduction processing by the photosensors 3 and 4 and the density of the reproduction surface on the recording paper after the reproduction processing are performed. If the relationship of D ₁ −D ₂ ≦ 0... (1) is satisfied by inputting (D ₂ ), the first conveyance path is not driven by driving the drive circuit 5 of the solenoid 1E1a. Switching claw 1E1
In an initial position. Accordingly, the recording paper S discharged from the reproduction processing unit 1C passes through the transport path 1E and is fed to the discard tank 1D2. On the other hand, when each density described above satisfies the relationship of D ₁ −D ₂ > 0 (2), the drive circuit 5 of the solenoid 1E1a is driven to drive the first conveyance path switching claw 1E1. Swing from the initial position. Accordingly, the recording paper S discharged from the reproduction processing unit 1C passes through the transport path 1E and is fed to the position of the second transport path switching claw 1E2. By the way, when the attitude of the first transport path switching claw 1E1 in the latter case is set, the density (D ₂ ) of the reproduction surface of the recording paper after the reproduction processing is equal to the reference density (D 2 ₀ )
Is determined. In other words, this determination is a standard density background density of the recording paper, D ₀ -D _{2> 0} ····· when a relationship of (3) the concentration concentration reusable recording paper after regeneration Then, the driving circuit 6 of the solenoid 1E2a is driven to swing the second transport path switching claw 1E2 from the initial position. Therefore, the recording paper S is fed toward the recording paper storage stacker 1D1. On the other hand, if the relationship shown in (3) is not satisfied, the drive circuit 6 of the solenoid 1E2a is driven by judging that although the reproduction process has been performed, the complete erasure of the printed portion has not been performed in one process. Without this, the second conveyance path switching claw 1E2 is maintained in the initial position.
Therefore, the recording paper S is not fed to the recording paper storage stacker 1D1, but is fed to the reproduction processing unit 1C, and undergoes another reproduction process. The background density used as the above-mentioned reference density is actually the density of the background when not in use, taking into account the density (D ₀ ′) due to the contamination by toner remaining in the fibers of the recording paper S. (D _MIN ) is set as D ₀ = D _MIN + D ₀ ′.

Since the present embodiment has the above configuration,
The conveyance state of the recording paper will be described below based on the operation of the control unit 2 shown in the flowcharts of FIGS. That is, when the recording paper S is fed from the paper supply unit 1B to the reproduction processing unit 1C, the density of the reproduction surface of the recording paper S is detected before being introduced into the reproduction processing unit 1C.
Is stored in the storage unit of the control unit 2. The density of the reproduction surface of the recording paper S discharged after the reproduction processing is detected by the photo sensor 4, and this detection data is taken into the above-mentioned storage unit, and the relations of (1) to (3) are obtained. Is determined.
Next, the first transport path switching claw 1E is determined according to the determination result.
By setting the positions of the first and second transport path switching claws 1E2, the feed paths to the recording paper storage stacker 1D1, the discard tank 1D2, and the reproduction processing unit 1C are set.

In the above-described configuration, the photosensor for detecting the density of the recording paper is provided on the recording paper introduction side and the discharge side with respect to the reproduction processing unit 1C. Can also.

FIG. 9 shows the configuration in the case described above.
In this configuration, a paper feed unit, a recording paper storage stacker, and a discard tank are provided on the same side of the reproduction processing unit 1C. That is, the transport path of the recording paper from the paper feeding section 1B to the reproduction processing section 1C is the transport path 1E from the reproduction processing section 1C to the stacker 1D1 for storing the reused recording paper and the reproduction processing section 1C.
It merges near the entrance of C, and a photosensor 3 for density detection is provided at this merging position. The above-described transport path 1E branches in the middle into a path leading to the reusable recording paper storage stacker 1D1 and a path leading to the discarding tank 1D2. Only the nail 1E4 corresponding to 1E1 is arranged. The swinging position of the claw 1E4 is set by the solenoid 1E1.
a. Therefore, in this configuration, among the feeding rollers 1E3 provided on the transport path 1E, the recording paper S is stored in such a manner that the recording paper S can be introduced into the reproduction processing section 1C again to receive the reproduction processing. A roller provided at a position corresponding to the recording paper introduction side of the stacker 1D1 is configured to be rotatable in the forward and reverse directions, and constitutes a switchback roller 7. It is designed to be able to be extended from a state where the end is gripped. According to the present embodiment, since a photosensor for density detection can be commonly used, the structural cost can be reduced by reducing the number of components and simplifying the transport path. In addition, the photo sensor 3 may detect the movement of the recording paper at the same position in synchronization with the movement of the recording paper.

Here, the toner of the printing section which is erased in the above-mentioned reproduction processing section will be described. The components of the toner are as follows. This toner uses a biodegradable plastic. For example, a plastic classified as a polysaccharide is used as its component. The specific plastics are Ecostar and Ecostar Plus (both are brand names manufactured by Ogiwara Kogyo)
This plastic is used in an amount of 1 to 70 parts by weight, preferably 1.5 to 50 parts by weight, based on 100 parts of the binder resin. The particle size of the toner made of this plastic is about 30 μm or less, preferably 3 to 20 μm.
Is selected. Then, in order to improve the fluidity of the toner, another external additive such as TiO ₂ , SiO ₂ , SnO ₂ or Al ₂ O ₃ may be added. Further, when the biodegradable plastic described above is used, the enzyme for decomposing the toner may be lipase or lipase.
An active substance is used. The lipases described above are esterases that undergo ester degradation, in addition to lipases on enzymatic degradation.
Phospholipase, lysophoslipase and the like may be used. Further, the lipase-active substance has the same action as lipase, and specifically, crude lipase, lipase-containing substances, lipase-producing bacteria and lipase-producing cultures are used. is there. Further, in order to promote the decomposition performance, a buffer for maintaining the pH at the time of decomposition, and a surfactant for increasing the contact area with the decomposing enzyme may be used. Monophosphates, second phosphates and nonionic surfactants as surfactants may be used.

Further, as the toner to be erased and reproduced by the above-mentioned reproduction processing section 1C, there is also a toner using a photo-decomposable plastic. In this case, the print decomposition processing in the reproduction processing section 1C shown in FIG. As a structure of the section 1C1, although not shown, a xenon lamp, a mercury lamp, an LED or a laser capable of irradiating short-wavelength light is used in place of the decomposition agent storage tank 1C1a and the decomposition agent application device 1C1c.
And, in addition to this, the structure is combined with the cleaning portion 1C3.

As the toner using a photodegradable plastic, a plastic containing a polymer of a vinyl ketone monomer is used. Specifically, the toner has the following components. Methyl vinyl ketone, methyl isopropenyl ketone, t-butyl vinyl ketone, ethyl vinyl ketone, phenyl vinyl ketone, divinyl ketone, acetoxymethol ketone, chloromethyl ketone, α-acetoxymethyl vinyl ketone, β-chlorovinyl methyl ketone, α- Chloromethyl vinyl ketone. Further, the polymer of these vinyl monomers may be a homopolymer or a copolymer, and specific examples of the monomer of the copolymer include ethylene, styrene, and methyl vinyl monomers. Examples include methacrylate, α-butyl methacrylate, α-ethylenehexyl methacrylate, vinyl chloride, α-methylstyrene, acrylonitrile, vinyl acetate, and propylene. This plastic is used in an amount of 1 to 70 parts by weight, preferably 1.5 to 5 parts by weight, based on 100 parts of the binder resin.
0 parts by weight.

Further, as the photolysis accelerator, aldose
-Α-naphthylamine condensate, acetylacetone, metal diethyl-dithiocarbamate iron, saltyl aldehyde, α-methylcaptobenzothiazole, metal stearate, thiodipropionic acid, iron acetylacetonate
G, p-benzoquinone, α-naphthoquinone, anthraquinone and its derivatives are selected. Further, by adding the above-mentioned decomposition accelerator to the above-mentioned binder resin, 1 to 70 parts by weight is selected, preferably 1.5 to 50 parts by weight, based on 10 C0 parts of the binder. The decomposition accelerators may be used alone or in combination of two or more. The toner particle size is about 30 μm or less, preferably 3 to 20 μm. In order to improve the fluidity of the toner, TiO ₂ , SiO ₂ , Sn
Other additives such as O ₂ and Al ₂ O ₃ may be added.

The above-mentioned photodegradable plastic is used in toner
When light is irradiated, the ketone group in the light-absorbing agent efficiently absorbs light energy, and functions such as fixing adhesion as a toner are removed in order to cut a -CC bond.
Therefore, as a light source used for light irradiation, short-wavelength light having good absorptivity is preferable, and therefore, a lighting device such as a xenon lamp or a mercury lamp containing a large amount of ultraviolet light is preferably used. In addition, instead of these illumination light sources, a short wavelength laser
May be used. Further, the short wavelength light described above is
Such a light source using short-wavelength light is advantageous because it effectively acts on the decomposition accelerator added to the binder resin.

[0029]

According to the first, second, fifth and sixth aspects of the present invention, the density on the reproducing surface of the recording medium introduced and discharged to the reproducing processing means is detected, and the recording medium is classified according to its activity. be able to. In particular, according to the second aspect of the present invention, when the density after reproduction is high, it is determined that reproduction cannot be performed, the recording medium is discarded, and a defective reproduction cannot be reused. As a result, it is possible to quickly use a recording medium such as recycled paper without the need for classification when the reproduced recording medium is reused.

According to the third and fourth aspects of the present invention, the density on the reproduction surface of the recording medium introduced and discharged to the reproduction processing means is detected, and the density after reproduction with respect to the reference density when reusable is possible. If the value is higher, the recording medium is conveyed again to the reproduction processing means, so that the reproduction processing can be executed again. Thus, if the playback surface cannot be used even with the recording medium on which the playback processing has been performed, the playback processing can be automatically performed again. Moreover, even if it is determined that the paper cannot be reused, it can be automatically determined that the cause is affected by the background density, such as colored recording paper. It is possible to improve the use of the reproduced recording medium by omitting the sorting operation.

[Brief description of the drawings]

FIG. 1 is a schematic layout diagram for explaining an overall configuration of a recording medium reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a part of a reproduction processing unit used in the apparatus shown in FIG.

FIG. 3 is a perspective view showing another part of the reproduction processing unit shown in FIG. 1;

FIG. 4 is a block diagram for explaining a control configuration of a reproduction processing unit shown in FIG. 1;

5A and 5B are a schematic perspective view and a plan view for explaining the configuration and operation of a density detecting unit connected to the control unit shown in FIG.

FIG. 6 is a diagram for explaining characteristics of the control unit shown in FIG. 4;

FIG. 7 is a flowchart for explaining the operation of the control unit shown in FIG. 4;

FIG. 8 is a flowchart for explaining the operation of the control unit shown in FIG. 4;

FIG. 9 is a schematic layout diagram for explaining another configuration of the recording medium reproducing device shown in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Recording paper reproducing apparatus which is one of the recording medium reproducing apparatuses 1B Paper feed section 1C Reproduction processing section 1D Stacker 1D1 Recording paper storage stacker 1D2 Discard tank corresponding to a collection section 1E Transport path 1E1 First transport path switching claw 1E2 Second transport path switching claw 2 Control unit 3, 4 Photosensor as density detecting means 5, 6 Drive unit for first and second transport path switching means

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Tohru Iida 1-3-6 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd. (56) References JP-A-63-183476 (JP, A) JP-A-63-183476 Hei3-140987 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03G 21/00 570-578 B41J 29/26 B41J 29/36

Claims (6)

(57) [Claims] 1. A means for feeding a printed recording medium obtained by a printing apparatus, a reproduction processing means for erasing and reproducing a stamped portion on the recording medium, and a reproduction processing means for reproducing the recording medium after the reproduction processing. What is claimed is: 1. A recording medium reproducing apparatus comprising: means for storing a usable recording medium; and means for recovering a non-reusable recording medium, wherein the reusable recording medium is transported in a transport path of the recording medium discharged from the reproduction processing means. Means for setting a transport path of the recording medium, which is provided at a position branched into a means for storing the recording medium and a means for collecting the non-reusable recording medium, and an introduction side of the recording medium with respect to the reproduction processing means. Means for detecting the density of the reproduction surface of the recording medium provided on the discharge side; the density detecting means connected to the input side; and the transport path switching means connected to the output side. And a control unit, the control unit compares the detection results from the density detecting means, a recording medium reproducing apparatus characterized by setting the state position of the conveyance path switching means according to the result. 2. The recording medium reproducing apparatus according to claim 1, wherein the control section determines a relationship between a density (D ₁ ) of the recording medium before reproduction and a density (D ₂ ) of the recording medium after reproduction. ₁ when satisfying a relationship -D ₂ ≦ 0, the recording medium reproducing apparatus characterized by driving the vector conveyance path switching means for directing the discarding means recording medium. 3. A means for feeding a printed recording medium obtained by a printing device, a reproduction processing means for erasing and reproducing a printed portion on the recording medium, and a reproduction processing means of the recording medium after the reproduction processing. A recording medium reproducing apparatus comprising: means for storing a usable recording medium; means for collecting a non-reusable recording medium; and resending means for sending the discharged recording medium to the reproduction processing means again. means for setting switching the conveyance path of the recording medium provided in a position which is branched into a unit and the retransmission unit for upper Symbol storage keep <br/> during conveyance path of the recording medium discharged from the reproduction processing means, Means for detecting the density of the reproduction surface of the recording medium provided on the introduction side and discharge side of the recording medium with respect to the reproduction processing means, the density detection means being connected to the input side, and the conveyance path switching means Is the output side A connected control unit, wherein the control unit is configured to, when the density after reproduction is lower than the density before reproduction, when the density after reproduction is lower than the reference density when reusable. Set the transport path switching means in a state of feeding the recording medium to the storage means of the reusable recording medium, and, if the density after reproduction is higher than the reference density, A recording medium reproducing apparatus, wherein the transport path switching means is set in a state of executing a reproducing process. 4. A recording medium reproducing apparatus according to claim 3, wherein said control unit uses the background density of the recording medium as a reference density when reusable. 5. The recording medium reproducing apparatus according to claim 2, wherein the means for detecting the density of the reproducing surface of the recording medium is provided so as to be movable in a direction perpendicular to the recording medium transport direction. A recording medium reproducing apparatus characterized by the above-mentioned. 6. A means for feeding the printed recording medium obtained by the printing apparatus, a reproduction processing means for reproducing and erasing the print unit on the recording medium, re of the recording medium after regeneration treatment means for storing a recording medium usable by a recording medium reproducing apparatus having a means for recovering the recording medium can not be reused, and a retransmission means for sending the discharged recording medium again to the reproduction processing unit, the retransmission means and the upper Symbol reservoir hand stage and said recovery means are located on the same side with respect to the reproduction processing unit, the re
The recording medium before the reproduction processing by the raw processing means and the reproduction
On the playback surface with the recording medium that has been played back by the raw processing means
Means for detecting the concentration at the same location in the
A recording medium reproducing apparatus configured to set a transport path of a recording medium to each of the above-described units in accordance with a detection result of the density detecting unit.