JP5774632B2 - Sheet full detection device, sheet stacking device, and erasing device - Google Patents

Description

  The embodiment described in this specification relates to a technique for detecting the fullness of a sheet when the conveyed sheet is stacked in a predetermined sheet storage unit such as a cassette.

  For example, there is an image erasing apparatus as an apparatus for stacking conveyed sheets in a sheet storage unit such as a cassette (Patent Document 1).

  Such an image erasing apparatus requires a sheet fullness detecting device for detecting that the sheets stacked on the sheet cassette are full, for example, in order to convey and stack the image-erased sheets on a sheet cassette.

  By the way, such a sheet fullness detection device may interfere with a sheet to be conveyed depending on the arrangement position and structure thereof, and interference with the sheet cassette must be avoided when taking out the sheet cassette. Furthermore, if high-precision sheet full detection can be performed, a large number of sheets can be conveyed at one time without interrupting the paper discharge operation.

  On the other hand, such a sheet fullness detecting device is arranged at a high part integration density where many parts are arranged, and therefore, an arrangement and a configuration in consideration of assembling and exchanging parts are desired.

JP 2011-184202 A

  An object of the present invention is to provide a sheet fullness detection device that can detect fullness with high accuracy and facilitates assembly and maintenance, a sheet stacking device including the sheet fullness detection device, and an erasing device.

Embodiments described in this specification, rotatable movable body conveys the sheet I by the conveying roller to hold the tip portion to the product placement area, provided you sequentially stacking equipment, are stacked This is a sheet full detection device for detecting the fullness of a sheet.

The sheet full sensing device tip is placed on the cam member provided on said movable member and said movable member follows the pivoting movement of the lifting for the sheet conveyance, the tip the cam A lever member that rotates while tracing over the member, and a sensor unit that outputs a full detection signal when the lever member rotates to the full position of the sheet.

Further, the sheet stacking apparatus according to the embodiment described in this specification includes the above-described sheet fullness detecting device, an elevating drive mechanism that lowers the movable body by its own weight and raises it by a spring force, and the movable body is at a retracted position. And a stopper portion that is connected to the movable body and prevents movement of the movable body .

Further, the erasing device of the embodiment described in this specification includes an erasing unit that erases an image printed with an erasable color material, a conveying unit that conveys a sheet erased by the erasing unit, and the conveying unit The sheet stacking apparatus to which the sheet transported in the above is transported,
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1 is a schematic front view of an erasing device according to an embodiment. The front view which shows schematic structure of the reuse paper accommodation cassette and alignment (conveyance) roller unit of FIG. The front view which shows the structure provided with the fullness detection mechanism in the alignment (conveyance) roller unit of FIG. FIG. 2 is a control block diagram of a control unit that performs operation control of the erasing apparatus of FIG. The front view of the full detection mechanism shown in FIG. The figure which shows the case where the detection state of a full detection mechanism is not a sheet full. The figure which shows the case where the detection state of a full detection mechanism is a sheet full. The figure which shows the state which the alignment (conveyance) roller unit went up to the retracted position. FIG. 7 is a perspective view of an alignment roller unit corresponding to FIG. 6. FIG. 9 is a perspective view of an alignment (conveyance) roller unit corresponding to FIG. 8. The perspective view of the rotation drive part which rotates an alignment (conveyance) roller unit for raising / lowering operation is shown, and the state rotated in the direction which raises an alignment roller unit is shown. The perspective view of the rotation drive part which rotates an alignment (conveyance) roller unit for a raising / lowering operation is shown, and the state rotated in the direction which lowers an alignment (conveyance) roller unit is shown. The top view which shows the relationship between an alignment (conveyance) roller unit and a stopper. FIG. 14 is a perspective view of FIG. 13. FIG. 6 is a perspective view showing a relationship between an alignment (conveyance) roller unit and a stopper, and a diagram showing a state in which the alignment (conveyance) roller unit is lowered and conveys a sheet to align the sheet. FIG. 5 is a perspective view showing a relationship between an alignment (conveyance) roller unit and a stopper, and a state in which the alignment roller unit is raised to a retracted position.

  Hereinafter, embodiments will be described with reference to the drawings.

  1 is a schematic view of an erasing apparatus according to the embodiment, FIG. 2 is a front view showing a schematic configuration of a reuse paper storage cassette and an alignment roller unit of FIG. 1, and FIG. 3 is provided with a full detection mechanism in the alignment roller unit of FIG. FIG. 4 is a control block diagram of a control unit that controls the operation of the erasing apparatus of FIG.

  In FIG. 1, a decoloring apparatus 101 includes a sheet feeding unit 10, a decoloring unit 20, a transport unit 40, a control unit 50 configured as shown in FIG. 4 for controlling the entire erasing apparatus, and a configuration illustrated in FIGS. At least a paper discharge unit 60. The paper discharge unit 60 includes a sheet full detection unit 70.

  The erasing apparatus 101 erases the color of the image on the paper (sheet), and performs, for example, a heat treatment on the sheet on which the image is printed with the erasable color material, so that the image (color material) on the sheet is It has a decoloring part that erases the color. A color erasable color material (erasable color material) such as a color erasable toner and a color erasable ink includes a color developing compound, a color developer, and a color eraser. Examples of the color developing compound include leuco dyes. Examples of the developer include phenols. The decolorizer includes a substance that is compatible with the color developing compound when heated and does not have an affinity for the developer. Colors that can be decolored develop color due to the interaction between the color developing compound and the developer, and decolorize because the interaction between the color developing compound and the developer is interrupted by heating above the decoloring temperature. .

  A sheet feeding unit 10 receives a sheet before erasing (a sheet is set), a sheet erasing holding unit (hereinafter referred to as a sheet feeding cassette) 11, and a sheet before erasing held by the sheet feeding cassette 11. A conveyance path 41 (conveyance section 40) for guiding to the erasing section 20 to be performed, and a sheet feeding roller for giving a propelling force (conveyance force) that enables conveyance (movement) of the sheet before erasing by the conveyance path 41 to the sheet before erasing 12, the conveyance roller 13 and the conveyance roller 14 are included.

  The conveyance path 41 is connected to a conveyance path 42 (conveyance section 40) that is partially shared with a reading section 30 described later.

  The conveyance path 42 (conveyance unit 40) is a sheet before erasing that is guided to the erasing unit 20 or the color of the image is erased in the erasing unit 20 (the color material that has developed color is erased). Hereinafter, the erasable sheet is guided to a erasable sheet holding unit (hereinafter referred to as a paper discharge unit) 60. The conveyance path 42 includes conveyance rollers 33 and 34 that apply a driving force that enables conveyance of the sheet along the conveyance path 42 to the pre-decolored sheet and the decolored sheet, respectively.

  The decoloring unit 20 divides the pre-decoloring sheet from the conveyance path 42 toward the heating unit 21 based on the reading result by the reading unit 30 to be described later, and the pre-decoloring sheet branched by the branching unit 22. A conveyance path 47 (conveyance unit 40) that guides the heating unit 21 and conveyance rollers 23 to 25 that impart a propulsive force that enables conveyance of the pre-decoloring sheet to the heating unit 21 to the pre-decoloring sheet. Conveying rollers 26 to 28 for guiding the decolored sheet to the conveying path 42. For example, the heating unit 21 applies a predetermined temperature to a sheet passing through a nip region defined by one roller and an endless belt, or between two rollers arranged so that the axes defining the rotation center are substantially parallel to each other. The above color erasing temperature (heat) is applied to erase the color erasable color material image.

  The reading unit 30 includes first and second image sensors 31 and 32 that detect that a sheet passing through the conveyance path 42 is a pre-decolored sheet. The first and second image sensors 31 and 32 read images on both sides of the sheet passing through the conveyance path 42. The control unit 50 determines the presence / absence of an image based on the read image information.

  The conveyance path 42 is connected to a conveyance path 43 that guides the decolored sheet branched by the branching device 22 to the paper discharge unit 60.

  The conveyance path 43 (conveyance unit 40) includes the paper discharge branching device 16 and the conveyance roller 15, and removes the decolored sheet branched by the branching device 22 from the first decolorized sheet holding unit (hereinafter, referred to as “decolored sheet holding unit”). It is guided to either a reusable paper cassette (61) or a second erased sheet holder (hereinafter referred to as a stocker) 62. The decolored sheets stored in the reuse paper cassette 61 are guided by the transport roller 63 and the transport path 44 (transport section 40). The decolored sheets stored in the stocker 62 are guided by transport rollers 63 to 65 and transport paths 45 and 46 forming the transport unit 40.

  A predetermined position where a sheet can be supplied to the conveyance path 42, for example, a conveyance path 41 that conveys a sheet supplied by the sheet feeding cassette 11 or a decolored sheet that has been decolored by the heating unit 21 is conveyed to the conveyance path 42. A manual paper feed unit 17 that supplies the pre-decolored sheet to the heating unit 21, that is, the decoloring unit 20 without passing through the paper feeding cassette 11, and a position upstream of the conveyance path 42 of the conveyance path 47 that conveys A manual feed path 48 including the feed roller 18 is connected.

  The controller 50 includes, for example, a CPU (Central Processing Unit) 51, a ROM (Read Only Memory) 52, a RAM (Random Access Memory) 53, and an input / output (I / O) port. 54, an operation unit 55, a discharge motor driving unit (driver) 56, a conveyance path switching control unit (branch unit driving unit) 57, a temperature control unit 58, a power supply unit 59, and the like.

  The CPU 51 controls the operation of each unit in accordance with the operation program stored in the ROM 52. The ROM 52 stores an operation program for operating the heating unit 21, a reference value used for comparison with the detection results of the first and second image sensors 31 and 32, and the RAM 53 inputs through the I / O port 54. For example, detection results from the first and second image sensors 31 and 32, reception of input from jam sensors prepared at predetermined positions of the respective transport paths 41 to 48 input through the I / O port 54, and instruction input by the operation unit 55 Responsible for temporary data retention during execution of processing routines according to (operation information). For example, the I / O port 54 converts detection results from the first and second image sensors 31 and 32 into a format that can be processed by the CPU 51, converts an instruction input from the operation unit 55 into a format that can be processed by the CPU 51, and discharges it. It contributes to the reception of various elements included in the paper unit 60, such as control instructions to the motor and branching device, the sheet full detection signal detected by the sheet full detection unit 70, and the rotation drive unit of the alignment (conveyance) roller unit. This contributes to drive instructions to the drive motor.

  The operation unit 55 receives an input of a control instruction from a user, for example, and outputs a control command corresponding to the dynamic control instruction so that the CPU 51 can read the control command.

  The paper discharge unit 60 uses the reusable sheet cassette (first erased sheet holding unit) 61 or the stocker (second erased sheet holding unit) 62 through the branching unit 16 for the erased sheet passing through the transport unit 43. I will guide you.

  As shown in FIG. 2, the reuse paper cassette 61 includes a housing 161, a stacking tray 162, a fulcrum 163 that supports the stacking tray 162, and the like, for example, a direction orthogonal to the stacking direction of sheets held by the stacking tray 162 (FIG. It can be moved in the middle and front and back directions of the paper, and can be removed from the paper discharge unit 60 (erasing device 101).

  The stacking tray 162 includes a stopper 162 that extends in a predetermined direction in which an angle formed by the paper table 162a and the paper table 162a is constant, for example, a direction orthogonal thereto. The side (sheet input side) far from the stopper 162b of the sheet table 162a is urged upward (sheet input side) by a spring member 162c or the like positioned between the housing 161.

  The stacking tray 162 is connected to the housing 161 at a fulcrum 163. The fulcrum 163 is one end of the stopper 162b of the stacking tray 162, and is far from the side away from the sheet table 162a and the sheet conveying side (sheet input end side). Located in position. The alignment (conveyance) roller 111 and the alignment (conveyance) restraining plate 165 are positioned at a predetermined position in the housing 161 in a state where the reuse paper cassette 61 is set at the operation position of the paper discharge unit 60.

  The conveyance roller 111 is disposed at a rotating front end portion of the conveyance roller unit 110 and conveys a sheet that moves on the paper tray 162a of the stacking tray 162 in the conveyance direction. The transport roller unit 110 is rotatably mounted with the transport roller unit support shaft 112 as a fulcrum, and is rotated in the up and down directions by a transport roller unit rotation drive unit 80 described later shown in FIGS. Further, the conveyance restraining plate 165 also moves up and down at the same timing as the conveyance roller unit 110 by a rotation drive mechanism (not shown). If the longitudinal direction of the transport roller unit support shaft 112 is the front-rear direction, the direction orthogonal to the transport roller unit support shaft 112 is the sheet transport direction.

  As shown in FIGS. 5 and 9, the transport roller unit 110 has a movable body 113 having a rectangular shape, for example, which is rotatably attached to the transport roller unit support shaft 112, and the rotation support shaft 114 is attached to the movable body 113. A conveyance roller 111 is rotatably attached to the medium. The movable body 113 is forcibly driven to rotate in the upward direction by the transport roller unit rotational drive unit 80, and descends by its own weight against the spring force in the downward direction. Accordingly, when the conveying roller 111 comes into contact with the uppermost position of the sheets stacked on the stacking tray 162, the lowering of the movable body 113 stops, and the sheet conveyed from the paper discharge roller 63 is sent to the back of the reuse paper cassette 61. . Then, the conveyance roller unit rotation driving unit 80 starts to be driven in the upward direction, and the movable body 113 is raised to a predetermined retreat position.

  A series of operations for lowering the movable body 113 by its own weight from the retracted position to the uppermost position of the stacked sheets, conveying the sheet, and raising the movable body 113 again is performed for each sheet discharged by the discharge roller 63. . When a sheet is conveyed and stacked in the reuse paper cassette 61 by the paper discharge roller 63, there is a limit to the number of cassettes that can be accommodated, so the sheet full detection unit 70 is provided. As the sheet fullness detection sensor constituting the sheet fullness detection unit 70, there are methods such as direct reading by a reflection sensor and an actuator type by a transmission type sensor. In this embodiment, an inexpensive actuator method is used.

  In the present embodiment, the sheet full detection unit 70 that detects the fullness of the sheet is configured by utilizing the change in the inclination angle of the movable body 113 at the lowered position as the number of sheets stacked increases.

  As described above, the detection sensor of the sheet full detection unit 70 uses an actuator method using a transmission type sensor.

  The seat full detection unit 70 rotates around the rotation support shaft 71 by rotating integrally with the detection lever member 72 that rotates about the rotation support shaft 71 whose axial direction is the front-rear direction, and the detection lever member 72. An operating portion having a fan-shaped light shielding member 73 that moves, and a transmission sensor portion 74 that is disposed between the light projecting and receiving portions arranged to face each other and that is turned on and off by the rotational position of the light shielding member 73. .

  The sheet full detection unit 70 has a lowered position and a raised position, similar to the transport roller unit 110, and in the case shown in FIG. 6 in which no sheets are stacked in the reuse paper cassette 61, the light shielding member 73 serves as the sensor unit 74. The sensor unit 74 outputs an ON signal. When the sheets stacked on the reuse paper cassette 61 increase and become full, as shown in FIG. 7, the light shielding member 73 is in a position to block the light projecting / receiving axis of the sensor unit 74, and the sensor unit 74 outputs an off signal. To do.

  The rotation support shaft 71 of the sheet full detection unit 70 and the conveyance roller unit support shaft 112 may be a common axis, but in this embodiment, they are separate axes. In the present embodiment, the rotation support shaft 71 is disposed downstream of and above the transporting roller unit support shaft 112 in the sheet transport direction. Further, the length of the detection lever member 72 is shorter than the length of the movable body 113 of the transport roller unit 110 in the sheet transport direction.

  In the present embodiment, a cam portion 115 is provided along the sheet conveyance direction on the front side of the movable body 113 in the front-rear direction, and the tip of the detection lever member 72 is in contact with the cam portion 115 from above. Accordingly, the detection lever member 72 is also raised and lowered following the raising and lowering operations of the transport roller unit 110. At that time, the rotation angle (operation angle) of the detection lever member 72 can be made wider than the rotation angle (operation angle) of the transport roller unit 110 by the cam locus of the cam portion 115. For this reason, the sensitivity of the sheet full detection unit 70 can be increased. In particular, the sensitivity in a region close to the full position can be arbitrarily increased by the cam locus of the cam portion 115.

  Here, the detection lever member 72 is merely on the conveyance roller unit 110, the detection lever member 72 slides on the cam portion 115, and the sliding surfaces of the detection lever member 72 and the cam portion 115 wear. For this reason, it is desirable to use a sliding material such as POM for these sliding portions.

  Further, the sensor unit 74 of the sheet full detection unit 70 is easier to lay out the sensor in the vicinity of the rotation support shaft 71, but can be arbitrarily set depending on the relationship with the attachment position with the light shielding member 73. Further, the light shielding member 73 can also be disposed at a position where it does not interfere with the curled portion when the conveyed sheet is curled.

  The sheet full detection unit 70 is configured such that the detection lever member 72 does not directly contact the sheets stacked on the reuse paper cassette 61 and moves up and down following the conveyance roller unit 110, and the heavy conveyance roller unit 110 is configured to move the sheet. Thus, it becomes difficult to be affected by the curl of the sheet, and the number of sheets (height) for which full detection is required is also stabilized.

  The sheet full detection unit 70 similarly rises and falls following the rise and fall of the transport roller unit 110 from the maximum lowered position shown in FIG. 6 to the retracted position that is the raised position shown in FIG. In the state shown in FIGS. 6 and 9, since the sheet stacking amount is not full, the light blocking member 73 does not block the light projecting / receiving axis of the sensor unit 74. Next, in the state shown in FIGS. 7 and 10, the sheet stacking amount is full, so the light blocking member 73 blocks the light projecting / receiving axis of the sensor unit 74. Here, the operating angle of the detection lever member 72 is larger than the operating angle of the transport roller unit 110 rotated from the state of FIG. 6 to the state of FIG. 7. Then, in order to pull out the reuse paper cassette 61, as shown in FIG. 8, the transport roller unit 110 is further raised and stopped at the substantially horizontal retreat position. In this retracted position, the detection lever member 72 of the sheet full detection unit 70 is present in the movable body 113, and therefore does not interfere with the reused paper cassette 61 that is pulled out.

  Further, when the transport roller unit 110 is assembled or replaced, the sheet full detection unit 70 has a structure in which the detection lever member 72 is simply on the cam unit 115 with respect to the transport roller unit 110. The work can be performed regardless of the sheet full detection unit 70. The same applies to the reverse case.

  Next, the configuration of the transport roller unit rotation drive unit 80 will be described with reference to FIGS. 11 and 12.

  A conveyance roller unit rotation drive unit (hereinafter abbreviated as a rotation drive unit) 80 is rotatable with respect to a conveyance roller unit support shaft (hereinafter abbreviated as a unit support shaft) 112 fixed to an apparatus main body (not shown). The movable body 111 of the attached transport roller unit 110 and the linear drive mechanism 81 are connected by a one-way engagement clutch 83.

  The one-way engagement clutch 83 is provided integrally with the first clutch 182 that is rotatably mounted on the unit support shaft 112 and the axially rear end side of the movable body 111, and is a rod shape that engages with the first clutch 182. A (claw-shaped) second clutch 183 is used. In the state shown in FIG. 11, the first clutch 182 is engaged with the second clutch 183 by rotating counterclockwise, and the movable body 111 is rotated counterclockwise around the unit support shaft 112. That is, the movable body 111 is rotated in the upward direction.

  On the other hand, in FIG. 11, when the first clutch 182 is rotated in the clockwise direction, the engagement with the second clutch 183 is released, and the movable body 111 can freely rotate in the clockwise direction. That is, in this embodiment, the movable body 111 rotates in the downward direction by its own weight.

  The linear drive mechanism unit 81 transmits the counterclockwise rotation and the counterclockwise rotation to the first clutch 182. The linear drive mechanism 81 is hooked on a slider 184 that can linearly reciprocate along the sheet conveying direction and a hook 185 provided at one end of the slider 184, and the slider 184 is spring-biased to the left in FIG. A tension spring (not shown) and a cylindrical stud (connecting pin) 187 that is expended from the slider 184 along the front-rear direction and is rotatably accommodated in the concave groove 186 of the first clutch 182 are provided.

  Since the slider 184 is given a moving force toward the upstream side (left side in the figure) in the sheet conveying direction by the spring force of the tension spring, the first clutch 182 is counterclockwise via the connecting pin 187. The rotating power is transmitted to the second clutch 183. Then, the second clutch 183 lifts and turns the movable body 111 by the spring force of the tension spring.

  Further, the first clutch 182 functions as a stopper for a rotational moment in which the movable body 111 rotates in the clockwise direction due to its own gravity when engaged with the second clutch 183. For this reason, as shown in FIG. 12, the slider 184 is slid downstream in the sheet conveying direction (right side in FIG. 11) against the spring force of the tension spring, and the engagement between the first clutch 182 and the second clutch 183 is achieved. When the match is released, the movable body 111 drops by its own gravity in the clockwise direction, that is, the movable body 111 in its descending direction. The connecting pin 187 is disposed in the groove 186 with a degree of freedom of movement in the radial direction in order to convert the linear motion of the slider 184 into the rotational motion of the first clutch 182.

  In the present embodiment, the slider 184 has a cam engagement plate portion 188 protruding in the front-rear direction, and the cam engagement plate portion is applied to the cam rotation plate 190 connected to the drive shaft 189 extending in the front-rear direction by the spring force of the tension spring. 188 is in contact. The slider 184 is formed with a long hole portion 191 having a size that does not interfere with the drive shaft 189 even if the drive shaft 189 passes therethrough and moves in the sheet conveying direction.

  The rotary cam plate 190 is rotationally driven by a drive motor (not shown) connected to the drive shaft 189. In the retracted state shown in FIG. 11, the first cam portion 190a having the lowest cam height of the rotating cam plate 190 contacts the cam engagement plate portion 188, and the slider 184 is most upstream in the sheet conveying direction by the spring force of the tension spring. Slide to the side position.

  In addition, at the maximum lowered position of the transport roller unit 110 shown in FIG. 12, the second cam portion 190 b having the highest cam height of the rotating cam plate 190 is in contact with the cam engagement plate portion 188. The cam position of the rotating cam plate 190 is detected by the sensor 192, and the transport roller unit 110 is moved to the retracted position when the reuse paper cassette 61 is taken out. Alternatively, the third cam portion 190c having an intermediate cam height may be set as a standby position, and the next sheet conveyance may be waited at this standby position.

  On the other hand, in addition to the conveying roller 111, a plate-like protruding plate portion 201 protruding upward is attached to the movable body 111. The protruding plate portion 201 has a curved rear end surface 201a facing downstream in the sheet conveying direction. Is formed.

  In the present embodiment, as described above, when the transport roller unit 110 is lifted, the spring force of the tension spring is used, so that the transport roller unit 110 may bounce and stop at a predetermined lift position. It is done.

  In addition, the transport roller unit 110 has two positions, a rising position and a lowering position. Switching between these positions is performed by a motor (not shown) or by its own weight, but it is moved at a speed according to the sheet transport. Therefore, vibration is generated, and sometimes the sheet conveyance amount of the conveyance roller 111 is affected.

  As shown in FIGS. 13 to 16, in the present embodiment, the ceiling disposed in the top surface portion of the cassette housing portion of the paper discharge portion 60 is for reinforcing the strength by avoiding interference with the transport roller unit 110. Using the plate 202, a stopper protrusion 203 that protrudes horizontally toward the upstream side in the sheet conveyance direction is projected on the upstream side in the sheet conveyance direction of the top plate 202, and the conveyance roller unit 110 is moved to a predetermined ascending position. A part of the transport roller unit 110 can be brought into contact with the stopper projection 203 at the position where the distance is reached.

  Since the protruding plate portion 201 of the conveyance roller unit 110 is provided at a position where it does not interfere with the stopper projection 203, a part of the conveyance roller unit 110 contacts the stopper projection 203 when the conveyance roller unit 110 is turned up, Vibration of the transport roller unit 110 is suppressed.

  13 is a top view in a state where the conveyance roller unit 110 is lowered, and FIG. 14 is a perspective view thereof. A gap is formed between the stopper projection 203 and the rear end surface 201a of the projection plate 201 in the sheet conveyance direction. There is. Further, even in the sheet conveyance state shown in FIG. 15, there is a gap in the sheet conveyance direction between the stopper projection 203 and the rear end surface 201a of the protruding plate 201.

  When the conveyance roller unit 110 is raised and the conveyance roller unit 110 reaches the standby position, as shown in FIG. 16, a part of the conveyance roller unit 110 and the stopper projection 203 interfere with each other in the sheet conveyance direction, and contact with each other in the front-rear direction. It becomes possible to contact.

  In this standby position, a gap 204 formed between the top plate 202 and the movable body 111 of the transport roller unit 110 is an interference in the sheet transport direction between a part of the transport roller unit 110 and the stopper projection 203. It is delimited in the front-rear direction by (overlap). Therefore, curled sheets stacked in the reuse paper cassette 61 are prevented from entering the gap 204.

  Therefore, the vibration at the time of separation of the conveyance roller unit 110 is suppressed, the operation of the conveyance roller unit 110 is stabilized, and the conveyance amount of the conveyance roller 111 is also ensured. In addition, by applying a cushioning material or the like to the stopper projection 203, it is possible to reduce the collision noise between the transport roller unit 110 and the stopper projection 203 during separation.

  Furthermore, even if a sheet that has been transported and stored in the cassette is unusable due to curling or the like in the reuse paper cassette 61, the periphery of the stopper projection 203 is formed into a comb-tooth shape by the member on the movable body 111 side. If the cover is provided, it is possible to reliably prevent the next conveyed sheet from passing through the gap 204 by mistake, and to prevent the sheet from jamming.

  In consideration of the fact that the movable body 111 rotates around the support shaft 112 and the formation of the gap 204, the outer shape of the movable body 111 is, for example, a fan shape, and the gap 204 is made as narrow as possible. The sheet may be prevented from entering the gap 204 in any state within the operation range of the transport roller unit 110.

  In the above-described embodiment, an example in which the sheet fullness detection device is provided in the erasing device has been described. However, the present invention is not limited to this, and can be applied to an apparatus for stacking conveyed sheets.

  The present embodiment can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the scope of claims, and is not restricted by the text of the specification. Further, all modifications, various improvements, alternatives and modifications belonging to the equivalent scope of the claims are all within the scope of the present invention.

  In the above description of the embodiment, the decoloring process is described as erasing the color of the image, but may include the meaning of erasing the image. That is, the erasing apparatus described in the present embodiment is not limited to an apparatus that erases the color of an image by heat. For example, an apparatus that erases the color of an image on a sheet by irradiating light is formed on a special sheet. It may be a device that erases the color of the printed image. Alternatively, the erasing device may be a device that removes (erases) an image on a sheet. The erasing device may be configured to make the image on the sheet invisible so that the sheet can be reused.

60 Paper discharge unit 61 Reuse paper cassette 70 Sheet fullness detection unit 80 Alignment (conveyance) roller unit rotation drive unit 110 Alignment (conveyance) roller unit 111 Conveyance roller 112 Conveyance roller unit support shaft 113 Movable body

Claims (5)

Rotatable movable member is provided on the stacked sequentially to that equipment by conveying the sheet I by the conveying roller to hold the product placement area at the tip, the sheet full state detection device for detecting the full sheets loaded Because
A front end portion is placed on a cam member provided on the movable body , and the front end portion rotates while tracing the top of the cam member following the turning operation of the movable body moving up and down for sheet conveyance. A moving lever member ;
When the lever member rotates to the full position of the sheet, a sensor unit that outputs a full detection signal;
A sheet fullness detecting device. The movable body rotates with the first support shaft as a fulcrum,
The lever member has a sheet full state detection apparatus according to claim 1, wherein the pivoting to Rukoto the first support shaft and the coaxial or different second shaft as a fulcrum. The sheet fullness detection apparatus according to claim 1 or 2, wherein the movable body is movable together with the lever member to a predetermined retreat position. A sheet full detection device according to any one of claims 1 to 3,
An elevating drive mechanism that lowers the movable body by its own weight and raises it by a spring force;
When the movable body reaches the retreat position, the stopper is connected to the movable body and prevents movement of the movable body ;
A sheet stacking apparatus. An erasing unit for erasing an image printed with an erasable color material;
A conveying unit that conveys the sheet erased by the erasing unit;
The sheet stacking apparatus according to claim 4, wherein the sheet conveyed by the conveyance unit is conveyed,
An erasing device.

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