JP2020015610A - Paper discharge device - Google Patents

Abstract

To inhibit paper collapse of paper bundles occurring in accompany with conveyance in a paper discharge device, without requiring a long time for the conveyance.SOLUTION: A paper discharge device 1 includes: a first conveyor 10 and a second conveyor 20 (conveyance units) for conveying a paper bundle PB consisting of multiple sheets of stacked paper P; a first conveyor transport drive unit 70 and a second conveyor transport drive unit 80 (driving units) for driving the first conveyor 10 and the second conveyor 20; and a control unit 30 for controlling the first conveyor transport drive unit 70 and the second conveyor transport drive unit 80. The control unit 30 determines at least one of conveyance speed and conveyance acceleration at which the paper bundle PB is conveyed by the first conveyor 10 and the second conveyor 20, based on stacked paper information (a paper kind, paper size, a paper direction, and a number of paper sheets) of the paper bundle PB stacked on the first conveyor 10 and the second conveyor 20.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a sheet discharge device that conveys a stacked sheet bundle.

  2. Description of the Related Art Conventionally, as a paper discharge device disposed on a paper discharge side of a printing device, a paper discharge device including a belt conveyor on which paper discharged from the inside of the printing device is stacked, and conveying the paper by the belt conveyor is known. (For example, see Patent Document 1).

JP-A-9-301627

  By the way, the transport unit such as the above-described belt conveyor transports a sheet bundle including a plurality of sheets when sheets are sequentially stacked and a print job is completed or when the number of stacked sheets reaches a predetermined number. .

  However, at the time of transporting a sheet bundle, the transport speed at the time of constant speed transport is higher, the transport acceleration at the time of accelerated transport (that is, positive acceleration) is larger, or the transport acceleration at the time of decelerated transport (that is, negative acceleration) is smaller. The larger the absolute value is, the more likely the paper bundle is to be broken. Note that paper collapse means, for example, a state in which a sheet is shifted in a sheet bundle or a state in which a sheet has dropped from the sheet bundle.

  By lowering the transport speed or reducing the absolute value of the transport acceleration, the paper collapse can be suppressed, but the transport time of the sheet bundle is extended accordingly.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet discharge device capable of suppressing paper sheet collapse of a sheet bundle caused by conveyance without requiring a long time for conveyance.

  In one aspect, a paper discharge device includes a transport unit that transports a bundle of sheets, which is a plurality of stacked sheets, a drive unit that drives the transport unit, and a control unit that controls the drive unit. The control unit determines at least one of a transport speed and a transport acceleration at which the transport unit transports the sheet bundle based on the loaded sheet information of the sheet bundle loaded on the transport unit.

  According to the above aspect, it is possible to suppress the paper sheet collapse of the sheet bundle caused by the conveyance without requiring a long time for the conveyance.

FIG. 1 is a configuration diagram illustrating a printing system including a sheet discharging device according to an embodiment. FIG. 3 is a diagram illustrating a control configuration of a sheet discharging device according to one embodiment. 5 is a table showing a relationship between stacked paper information and a transport speed and a transport acceleration according to one embodiment. 5 is a graph (part 1) illustrating an example of a conveyance speed and a conveyance acceleration of a sheet bundle in one embodiment. 6 is a graph (part 2) illustrating an example of a conveyance speed and a conveyance acceleration of a sheet bundle in one embodiment. 9 is a graph (part 3) illustrating an example of a conveyance speed and a conveyance acceleration of a sheet bundle in one embodiment.

  Hereinafter, a paper discharge device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram illustrating a printing system 100 including a paper discharge device 1 according to an embodiment.

  The printing system 100 illustrated in FIG. 1 includes a first printing device 110, a first intermediate device 120, a second printing device 130, a second intermediate device 140, and the sheet discharging device 1.

  In the printing system 100, when one-sided printing is performed on the paper P, the first printing device 110 or the second printing device 130 performs one-sided printing. When double-sided printing is performed on the paper P, for example, the first printing device 110 performs front side printing, and the second printing device 130 performs back side printing. In FIG. 1, the transport paths R1, R2-1, R2-2, R3, R4-1, and R4-2 of the sheet P are indicated by broken lines.

  The first printing device 110 includes a paper feed table 111, a scraper roller 112, a pickup roller 113, a registration roller pair 114, a printing unit 115, a suction conveyance unit 116, and a paper discharge roller pair 117.

Sheets P before printing are stacked on the sheet feeding table 111.
The scraper roller 112 is a feed roller that feeds and transports the uppermost sheet P among the sheets P stacked on the sheet feeding table 111.

  The pickup roller 113 conveys the sheet P fed by the scraper roller 112.

  The registration roller pair 114 conveys the sheet P after the sheet P is abutted for skew correction.

  The printing unit 115 has, for example, a line head type inkjet head (not shown) for each color used for printing. The printing method of the printing unit 115 may be a printing method other than the inkjet printing method.

  The suction conveyance unit 116 is arranged to face the printing unit 115. The suction conveyance unit 116 conveys the sheet P by a belt while adsorbing the sheet P.

  The discharge roller pair 117 discharges the paper P from the first printing device 110 by transporting the paper P.

  The first intermediate device 120 includes a transport roller pair 121, a switchback roller pair 122, and a transport roller pair 123.

  The transport roller pair 121 transports the sheet P discharged from the first printing device 110 by the discharge roller pair 117 of the first printing device 110. The paper P transported by the transport roller pair 121 is fed from a straight transport path R1 continuing from the first printing device 110 to a reverse transport path R2-1 for reversing the sheet P or a straight transport without reversing the sheet P by a switching mechanism (not shown). The transport is switched to the route R2-2.

  The switchback roller pair 122 is rotatable in both forward and reverse directions, and switches back the paper P in the reverse transport path R2-1 and transports the paper P toward the transport roller pair 123.

  The transport roller pair 123 transports the sheet P transported from the reverse transport path R2-1 or the straight transport path R2-2 to the straight transport path R3 following the second printing device 130.

  The second printing device 130 includes a pair of registration rollers 131, a printing unit 132, a suction conveyance unit 133, and a pair of discharge rollers 134.

  The registration roller pair 131 conveys the sheet P after the sheet P is abutted for skew correction.

  The printing unit 132 has, for example, a line head type inkjet head (not shown) for each color used for printing. The printing method of the printing unit 132 may be a printing method other than the inkjet printing method.

  The suction conveyance section 133 is arranged to face the printing section 132. The suction conveyance unit 133 conveys the sheet P by a belt while adsorbing the sheet P.

  The paper discharge roller pair 134 discharges the paper P from the second printing device 130 by transporting the paper P.

  The second intermediate device 140 includes a transport roller pair 141, a switchback roller pair 142, and a transport roller pair 143.

  The transport roller pair 141 transports the sheet P discharged from the second printing device 130 by the discharge roller pair 134 of the second printing device 130. The sheet P conveyed by the pair of conveying rollers 141 has a straight conveying path R3 continuing from the second printing apparatus 130 and a reversing conveying path R4-1 for reversing the sheet P or a straight conveying method for not reversing the sheet P by a switching mechanism (not shown). The transport is switched to the route R4-2.

  The switchback roller pair 142 is rotatable in both forward and reverse directions, and switches back the paper P in the reverse transport path R4-1 and transports the sheet P to the transport roller pair 143.

  The transport roller pair 143 discharges the sheet P transported from the reverse transport path R4-1 or the straight transport path R4-2 from the second intermediate device 140.

FIG. 2 is a diagram illustrating a control configuration of the sheet discharging device 1.
As shown in FIG. 1, the paper discharge device 1 includes a first conveyor 10 and a second conveyor 20. As shown in FIG. 2, the paper discharge device 1 includes a control unit 30, a storage unit 40, an interface unit 50, a sensor 60, a first conveyor transport driving unit 70, and a second conveyor transport driving unit 80. And a first conveyor elevating drive unit 90.

  The sheet discharging device 1 is disposed in a printing system 100 including a first printing device 110 and a second printing device 130, which are examples of a plurality of printing devices. What is necessary is just to arrange | position to the apparatus which performs. Further, the paper discharge device 1 is disposed adjacent to the second intermediate device 140, but may be disposed adjacent to the second printing device 130 without passing through the second intermediate device 140. Further, the paper discharge device 1 may be a paper discharge device integrally including the second intermediate device 140.

  As shown in FIG. 1, the first conveyor 10 has a belt 11 and rollers 12 and 13.

  The belt 11 is stretched between the rollers 12 and 13. As described above, the sheet P discharged from the second intermediate device 140, that is, the printed sheet P is stacked on the belt 11. As described above, the sheets P discharged from the printing devices (the first printing device 110 and the second printing device 130) are sequentially stacked on the first conveyor 10 (belt 11). That is, the first conveyor 10 also functions as a paper discharge tray. Further, the belt 11 conveys a sheet bundle PB, which is a plurality of sheets P, at a timing when the control unit 30 described later controls the first conveyor conveyance driving unit 70.

  One of the rollers 12 and 13 is a driving roller to which power is transmitted from a first conveyor conveyance driving unit 70 described later, and the other is a driven roller.

The second conveyor 20 has a belt 21, rollers 22 and 23, and a mounting table 24.
The belt 21 is stretched between the rollers 22 and 23. Further, the belt 21 is disposed downstream of the belt 11 in the transport direction D of the first conveyor 10 and transports the sheet bundle PB transported from the belt 11 to, for example, the center of the belt 21 in the transport direction D. Thereafter, the sheet bundle PB is received by the user. Note that a third conveyor may be arranged further downstream of the second conveyor 20 in the transport direction D. In this case, the second conveyor 20 conveys the sheet bundle PB to the third conveyor.

  One of the rollers 22 and 23 is a driving roller to which power is transmitted from a second conveyor conveyance driving unit 80 described later, and the other is a driven roller.

  The installation table 24 is installed so that the height of the belt 21 is adjusted to the height of the belt 11 during transportation.

  Here, the first conveyor 10 and the second conveyor 20 are examples of a transport unit (conveyor) that transports the sheet bundle PB. The transport unit may be only the first conveyor 10 on which the sheets P are sequentially stacked. The first conveyor 10 and the second conveyor 20 have the belts 11 and 21 and can be said to be belt conveyors, but may be other conveyance units such as a roller conveyor. Although FIG. 1 shows the first conveyor 10 housed in the housing and the second conveyor 20 not housed in the housing, both the first conveyor 10 and the second conveyor 20 are housed. It may be housed in the body, or both may not be housed in the housing.

  The control unit 30 illustrated in FIG. 2 includes a processor (for example, a CPU: Central Processing Unit) that functions as an arithmetic processing device that controls the operation of the entire sheet discharging device 1, and the operation of each unit such as the first conveyor transport driving unit 70. Control. The control unit 30 is not limited to a single control unit. For example, the control unit 30 controls the first conveyor transport driving unit 70 and the first conveyor lifting / lowering driving unit 90, and controls the second conveyor transport driving unit 80. The control unit and the control unit may be separately arranged.

  The storage unit 40 is, for example, a ROM (Read Only Memory) which is a read-only semiconductor memory in which a predetermined control program is recorded in advance, and a work storage area as necessary when the processor executes various control programs. A random access memory (RAM), which is a semiconductor memory that can be written and read as needed, is used.

  The interface unit 50 exchanges various information with an external device such as a control unit of the printing system 100. For example, the interface unit 50 receives, from the control unit of the printing system 100, information that the printing of the print job has been completed, and based on this information, the control unit 30 determines if the first conveyor 10 is at the position where the first conveyor 10 has moved up. The first conveyor up / down drive unit 90 is controlled so as to lower the first conveyor 10 to the transport position at the lower end. Further, the control unit 30 controls the first conveyor transport driving unit 70 so that the first conveyor 10 transports the sheet bundle PB.

  Alternatively, when the number of sheets P stacked on the first conveyor 10 has reached a predetermined number (for example, the sensor that detects the height of the first When it is detected that the first conveyor 10 descends and is at the lower end conveyance position as the sheets P are stacked on the conveyor 10), the first conveyor 10 conveys the sheet bundle PB by the first conveyor 10. The transport drive unit 70 is controlled.

  The sensor 60 includes a sensor for detecting the height of the first conveyor 10, a sensor for detecting a position of the sheet bundle PB stacked on the first conveyor 10 in the transport direction D, and a sensor for detecting the position of the sheet bundle PB stacked on the second conveyor 20. It is preferable to include a sensor or the like for detecting a position in the transport direction D. Further, the sensor 60 may include an airflow detection sensor that detects an airflow that is an example of environment information of an environment in which the paper discharge device 1 is installed, a humidity detection sensor that detects a humidity that is another example of environment information, and the like. . These airflow detection sensor and humidity detection sensor function as an example of an environment information detection unit that detects environment information. The environment information detected in this way is acquired by the control unit 30. Note that environmental information such as airflow and humidity may be detected by a sensor of a device other than the sheet discharging device 1 and acquired by the control unit 30 via the interface unit 50.

  The first conveyor transport drive unit 70 is an example of a drive unit (actuator) that drives the first conveyor 10, and the second conveyor transport drive unit 80 is an example of a drive unit (actuator) that drives the second conveyor 20. is there. The first conveyor transport driving unit 70 and the second conveyor transport driving unit 80 are, for example, motors. In addition, a single drive unit serving as the first conveyor transfer drive unit 70 and the second conveyor transfer drive unit 80 is arranged, and the power of this single drive unit is applied to each of the first conveyor 10 and the second conveyor 20. It may be transmitted.

  The first conveyor lifting drive unit 90 is an actuator for moving the first conveyor 10 between an upper end initial position and a lower end transfer position, and is, for example, a motor. Under the control of the control unit 30, the first conveyor lifting drive unit 90 lowers the first conveyor 10 as the sheets P are stacked on the first conveyor 10.

  By the way, when the first conveyor 10 and the second conveyor 20 convey the sheet bundle PB, as the conveying speed of the sheet bundle PB at the time of the constant speed conveyance is higher, the conveyance acceleration of the sheet bundle PB at the time of the accelerated conveyance (that is, the positive acceleration). Is greater, or the absolute value of the transport acceleration (that is, negative acceleration) of the sheet bundle PB during decelerated transport is greater, the paper bundle PB is more likely to collapse. By lowering the transport speed or reducing the absolute value of the transport acceleration, the paper collapse can be suppressed, but the transport time will be increased accordingly.

  Therefore, in consideration of the transport time, it is desirable that the transport speed of the sheet bundle PB be as fast as possible or the absolute value of the transport acceleration be as high as possible. Therefore, in the present embodiment, the control unit 30 determines whether the first conveyor 10 and the second conveyor 20 have the sheet based on the later-described stacked sheet information of the sheet bundle PB stacked on the first conveyor 10 and the second conveyor 20. The transport speed and / or the transport acceleration for transporting the bundle PB are determined. Further, the control unit 30 controls the first conveyor conveyance driving unit 70 and the second conveyor conveyance driving unit 80 on the basis of the determined conveyance speed and the conveyance acceleration, so that the first conveyer 10 and the second conveyer 20 transfer the paper. The bundle PB is transported.

  If one of the transport speed and the transport acceleration is not determined based on the loaded paper information, the other that is not determined may be a predetermined value that is not based on the loaded paper information. Further, the control unit 30 controls the transport speed and the transport speed based on the above-described loading sheet information only when the setting of performing the process of determining the transport speed and the transport acceleration based on the loading sheet information is set by, for example, a user. The conveyance acceleration may be determined.

  First, an example in which the control unit 30 determines the transport speed and the transport acceleration by referring to the table illustrated in FIG. 3 stored in the storage unit 40 will be described.

  FIG. 3 is a table showing the relationship between the loaded paper information (parameters), the transport acceleration during accelerated transport or decelerated transport, and the transport speed during constant-speed transport.

  First, the loaded sheet information of the sheet bundle PB loaded on the first conveyor 10 or the second conveyor 20 includes the type of the sheet P (the sheet type in FIG. 3), the size of the sheet P (the sheet size in FIG. 3), 3 (the sheet direction in FIG. 3) and the number of stacked sheets P (sheet bundle PB) (the number of sheets in FIG. 3).

  In the table shown in FIG. 3, four types of paper type, paper size, paper direction, and number of paper sheets are included as the loading paper information, but the table shown in FIG. 3 may include at least one loading paper information. The stacking sheet information is acquired by the control unit 30 based on, for example, a print job.

  The paper type is, for example, plain paper having a relatively large basis weight (weight per unit area), thin paper having a relatively small basis, or the like. Since thin paper has a smaller basis weight than plain paper, if the paper size is the same, the weight is reduced, and the frictional force against sliding is reduced. Therefore, it can be said that thin paper is more likely to collapse than plain paper.

  Note that the paper type may include thick paper having a larger basis weight than plain paper. Further, the paper type is not limited to the basis weight (thin paper or plain paper), and may be another paper type such as the material of the paper P. This is because the frictional force generated differs depending on the material of the paper P, and the likelihood of paper collapse also differs.

  The paper size is, for example, A3 (297 × 420 mm), A4 (210 × 297 mm), or the like. A4, which is smaller in size than A3, has a smaller contact area with the belts 11 and 21 of the first conveyor 10 and the second conveyor 20 than A3, so that the frictional force is smaller. Therefore, it can be said that A4 is more likely to cause paper collapse than A3.

  The paper direction is a vertical direction in which the longitudinal direction of the paper P is parallel to the transport direction D, or a horizontal direction in which the longitudinal direction of the paper P is orthogonal to the transport direction D. In the horizontal direction, since the distance from the center of gravity to the overturning fulcrum is shorter than in the vertical direction, it can be said that paper collapse is more likely to occur in the horizontal direction.

  The number of sheets is, for example, 1 to 1000, 1001 to 2000, 2001 or more. The larger the number of stacked sheets, the higher the center of gravity. Therefore, 2001 or more sheets are most likely to be broken, and 1001 to 2000 sheets are most likely to be broken next, and 1 to 2000 sheets are most likely to be broken. It is unlikely to occur. In the table of FIG. 3, the number of sheets is divided into three ranges, but may be divided into four or more or two ranges.

The table in FIG. 3 includes the transport acceleration (a1 to x1 [m / s ² ]) during accelerated transport and the transport acceleration (a2 during decelerated transport) corresponding to the above-described paper type, paper size, paper direction, and number of paper sheets. To x2 [m / s ² ]) and the speed (a3 to x3 [m / s]) at the time of constant speed conveyance. The transport acceleration and the transport speed may be determined experimentally. For example, the absolute value of the transport acceleration becomes smaller and the transport speed becomes slower as the loaded paper information includes information that easily causes paper collapse. It is good to be set as follows.

For example, in the table shown in FIG. 3, when the paper type is "thin paper", the paper size is "A4", the paper direction is "horizontal", and the number of paper sheets is "2001 or more", paper collapse is most likely to occur. It is desirable that the absolute value of the acceleration x1 [m / s ² ] at the time of conveyance and the acceleration x2 [m / s ² ] at the time of deceleration conveyance be the smallest and the speed x3 [m / s] at the time of constant speed conveyance be the slowest. .

  The smaller the absolute value of the transport acceleration (ie, positive acceleration) during accelerated transport and the transport acceleration during decelerated transport (negative acceleration), the less likely paper collapse occurs, and the direction of the acceleration is opposite. is there. Therefore, a value obtained by subtracting -1 times the transport acceleration during accelerated transport may be set as the transport acceleration during decelerated transport.

  Further, for the sheet bundle PB under the condition (for example, the sheet size B4) including the stacking sheet information that is not included in the table of FIG. May be done.

  For example, the paper size B4 (257 × 364 mm) is smaller than A3 (297 × 420 mm), but larger than A4 (210 × 297 mm), which is more likely to cause paper collapse than A3. Therefore, in such a case, the control unit 30 determines the transport speed of B4 to be lower than the transport speed of A3 and higher than the transport speed of A4, where the other loaded paper information such as the paper type matches. It is preferable that the transport acceleration of B4 is determined to be a transport acceleration whose absolute value is smaller than the transport acceleration of A3 and whose absolute value is larger than the transport acceleration of A4. For example, the control unit 30 may determine the transport speed and the transport acceleration of B4 so that the other loaded paper information such as the paper type becomes an intermediate value between A3 and A4, or A3, A4 and B4. The transport speed and the transport acceleration of B4 may be determined so that the respective ratios of the transport speed and the transport acceleration coincide with the area ratio of.

  When the control unit 30 cannot acquire a part (for example, paper type) of the loaded paper information included in the table of FIG. 3 as the loaded paper information of the paper bundle PB, the paper type “plain paper” and other The transport speed may be determined to be an intermediate value between the transport speed corresponding to the acquired loaded paper information and the transport speed corresponding to the sheet type “thin paper” and other acquired loaded paper information. Similarly, for the transport acceleration, for example, the transport acceleration corresponding to the paper type “plain paper” and the other acquired loading paper information, and the transport acceleration corresponding to the paper type “thin paper” and the other acquired loading paper information It is preferable to determine an intermediate value between the transfer acceleration and the transfer acceleration. That is, the control unit 30 may determine the transport speed and the transport acceleration based on the plurality of transport speeds and the plurality of transport accelerations corresponding to the acquired part of the loaded paper information.

FIG. 4 is a graph illustrating an example of the transport speed and the transport acceleration of the sheet bundle PB.
In FIG. 4, the sheet type “plain paper”, the sheet size “A3”, and the sheet direction “portrait” are common, and the number of sheets is “1 to 1000”, “1001 to 2000”, “2001 or more”. 3 shows examples of the conveyance acceleration and the conveyance speed of the sheet bundle PB under three different conditions.

As shown in FIG. 3, under the conditions of “1 to 1000 sheets”, “1001 to 2000 sheets”, and “2001 or more”, the transport acceleration at the time of accelerated transport is a1, b1, c1 [m / s ² ], the transport acceleration during decelerated transport is a2, b2, c2 [m / s ² ], and the transport speed during constant-speed transport is a3, b3, c3 [m / s]. ].

As shown in FIG. 4, under the condition (the thin solid line) where the number of sheets is "1 to 1000", paper collapse is hardest to occur among the three conditions, and therefore, the transport acceleration a1 [m / s ² ] and the transport acceleration a2 [m / s ² ] during decelerated transport become the largest, and the transport speed a3 [m / s] during constant-speed transport becomes the fastest.

Under the condition that the number of sheets is “1001 to 2,000” (thick solid line), paper collapse is the second least likely to occur among the three conditions, and therefore the transport acceleration b1 [m / s ² ] during accelerated transport And the absolute value of the transport acceleration b2 [m / s ² ] at the time of decelerated transport becomes the second largest, and the transport speed b3 [m / s] at the time of constant speed transport becomes the second fastest.

Further, under the condition that the number of sheets is “2001 or more” (thin broken line), paper collapse is most likely to occur among the three conditions. Therefore, the transport acceleration c1 [m / s ² ] during accelerated transport and the decelerated transport The absolute value of the transport acceleration c2 [m / s ² ] at the time becomes the smallest, and the transport speed c3 [m / s] at the time of the constant speed transport becomes the slowest.

  As described above, in the relationship between the transport speed and the absolute value of the transport acceleration, the absolute value of the transport acceleration may be smaller as the transport speed is slower. However, as shown in FIG. Only the acceleration (z11, z12, z13) and the transport acceleration (z21, z22, z23) during decelerated transport may be different from other conditions, and the transport speed (y10) during constant-speed transport may be constant. Further, only one of the transport acceleration during the accelerated transport and the transport acceleration during the decelerated transport may be different from the other conditions. As shown in FIG. 6, the transport acceleration (z30) during accelerated transport and the transport acceleration (z40) during decelerated transport are constant, and only the transport speeds (y21, y22, y23) during constant-speed transport are different. May be different from the above condition.

  As described above, the control unit 30 illustrated in FIG. 2 determines at least one of the transport acceleration at the time of accelerated transport, the transport acceleration at the time of decelerated transport, and the transport speed at the time of constant-speed transport based on the loaded paper information. Good.

  In the above description, an example in which the control unit 30 determines the transport speed and the transport acceleration by referring to the table has been described. By doing so, at least one of the transport acceleration during accelerated transport, the transport acceleration during decelerated transport, and the transport speed during constant-speed transport may be determined.

  As an example, the reference transport speed (reference transport speed) and transport acceleration (reference acceleration) are not changed in the case of the paper type “plain paper”, and the paper is more likely to collapse than “plain paper”. In the case of a sheet type “thin paper” that is likely to be generated, the speed is reduced by multiplying the reference transport speed by a set value (less than 1), or is reduced by subtracting the set value from the reference transport speed. The control unit 30 can determine the transport speed and the accelerated transport degree by performing such an operation for each piece of loaded paper information.

  Note that the control unit 30 can also determine the transport speed and the transport acceleration by calculation without using the reference transport speed and the reference transport acceleration. For example, the transport speed and the transport acceleration can be determined by calculation by adding or multiplying the set values corresponding to each piece of loaded paper information.

  Further, the control unit 30 may determine the transport speed and the transport acceleration based on environmental information such as airflow and humidity of the environment where the paper discharge device 1 is installed, in addition to the above-described loaded paper information.

  For example, it can be said that paper collapse is more likely to occur when the airflow is strong than when the airflow is weak. In addition, when the humidity is low, the weight of the paper P is smaller than when the humidity is high, so that it can be said that the paper P is likely to collapse. Therefore, the setting value corresponding to the environment information may be determined such that the transport speed becomes slower and the absolute value of the transport acceleration becomes smaller as the airflow becomes stronger or the humidity becomes lower.

  For example, the control unit 30 multiplies, adds, or subtracts a set value corresponding to the environment information from the transfer speed and the transfer acceleration obtained by referring to the table shown in FIG. And the transport acceleration can be determined. Further, as described above, when the control unit 30 performs the calculation using the set value corresponding to each piece of stacked paper information without referring to the table, not only the set value corresponding to the stacked sheet information but also the environmental information The calculation may be performed using the set value corresponding to.

  In the present embodiment described above, the paper discharge device 1 includes the first conveyor 10 and the second conveyor 20, which are an example of a transport unit that transports a sheet bundle PB that is a plurality of stacked sheets P, Controls a first conveyor transport drive 70 and a second conveyor transport drive 80, which are examples of a drive for driving the conveyor 10 and the second conveyor 20, and controls the first conveyor transport drive 70 and the second conveyor transport drive 80. And a control unit 30 that performs the operation. The control unit 30 controls the transport speed and the transport acceleration at which the first conveyor 10 and the second conveyor 20 transport the sheet bundle PB based on the loaded sheet information of the sheet bundle PB loaded on the first conveyor 10 or the second conveyor 20. Is determined.

  For this reason, if the loaded sheet information of the loaded sheet bundle PB is a condition in which the paper collapse is likely to occur, the transport speed can be reduced and the absolute value of the transport acceleration can be reduced as compared with the condition in which the paper collapse is unlikely to occur. By doing so, paper collapse can be suppressed. Further, compared to the case where the transport speed is uniformly reduced or the absolute value of the transport acceleration is reduced, it is possible to prevent the transport of the sheet bundle PB from taking much time. Therefore, according to the present embodiment, it is possible to suppress the sheet collapse of the sheet bundle PB caused by the conveyance without requiring a long time for the conveyance.

  Further, in the present embodiment, the loaded paper information includes the type of the paper P (the paper type in FIG. 3), the size of the paper P (the paper size in FIG. 3), the orientation of the paper P (the paper direction in FIG. 3), and It includes at least one of the number of stacked sheets P (the number of sheets in FIG. 3). This makes it possible for the loaded paper information to accurately represent the likelihood of paper collapse, so that it is possible to determine an accurate transport speed or transport acceleration that does not easily cause paper collapse and does not require a long time for transport. it can.

  Further, in the present embodiment, the control unit 30 determines at least one of the transport speed and the transport acceleration by referring to a table representing the relationship between the loaded paper information and at least one of the transport speed and the transport acceleration. I do. Therefore, the control unit 30 can accurately determine the transport speed and the transport acceleration by a simple control of referring to the table.

  Further, in the present embodiment, the control unit 30 determines at least one of the transport speed and the transport acceleration by performing an operation based on the set value corresponding to the loaded paper information. Therefore, even if a table is not prepared, the control unit 30 can determine an accurate transfer speed and a transfer acceleration that are unlikely to cause paper collapse and do not require a long time for transfer.

  Further, in the present embodiment, the control unit 30 determines at least one of the transport speed and the transport acceleration based on the loaded paper information and the environment information of the environment where the paper discharge device 1 is installed. As described above, since the control unit 30 determines the transport speed and the transport acceleration based on not only the loaded paper information but also the environmental information, the precise transport speed that does not cause paper collapse and does not require a long time for transport is determined. And the transport acceleration can be determined.

  Further, in the present embodiment, the transport unit includes the first conveyor 10 that transports the sheet bundle PB, and the second conveyor 20 that is disposed downstream of the first conveyor 10 in the transport direction D and transports the sheet bundle PB. The driving unit includes a first conveyor conveyance driving unit 70 for driving the first conveyor 10 and a second conveyor conveyance driving unit 80 for driving the second conveyor 20, and the control unit 30 Based on the sheet information, at least one of the transport speed and the transport acceleration at which the first conveyor 10 and the second conveyor transport unit 20 transport the sheet bundle PB are determined. As a result, as described above, for the sheet bundle PB delivered from the first conveyer 10 to the second conveyer 20, it is possible to suppress the paper collapse that occurs with the conveyance without requiring a long time for the conveyance.

  It should be noted that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying constituent elements without departing from the scope of the invention at the stage of implementation. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, all components described in the embodiments may be appropriately combined. Of course, various modifications and applications are possible without departing from the spirit of the invention. Hereinafter, the inventions described in the claims at the time of filing the application of the present application are additionally described.

[Appendix 1]
A conveyance unit that conveys a sheet bundle that is a plurality of stacked sheets,
A drive unit for driving the transport unit,
A control unit for controlling the driving unit,
The control unit may determine at least one of a transport speed and a transport acceleration at which the transport unit transports the sheet bundle based on loaded sheet information of the sheet bundle loaded on the transport unit. Paper ejection device.

[Appendix 2]
The sheet discharge device according to claim 1, wherein the loaded sheet information includes at least one of the type of the sheet, the size of the sheet, the direction of the sheet, and the number of sheets stacked.

[Appendix 3]
The control unit determines the at least one of the transport speed and the transport acceleration by referring to a table representing a relationship between the loaded paper information and at least one of the transport speed and the transport acceleration. 3. The sheet discharging device according to claim 1, wherein

[Appendix 4]
The control unit determines at least one of the transport speed and the transport acceleration based on the loaded paper information and environmental information of an environment in which the paper ejection device is installed. 4. The paper discharge device according to any one of 1 to 3, above.

[Appendix 5]
The transport unit has a first conveyor that transports the sheet bundle, and a second conveyor that is disposed downstream of the first conveyor in the transport direction and transports the sheet bundle,
The drive unit has a first conveyor transport drive unit that drives the first conveyor, and a second conveyor transport drive unit that drives the second conveyor,
The control unit determines at least one of the transport speed and the transport acceleration at which the first conveyor and the second conveyor transport unit transport the sheet bundle based on the loaded paper information. 5. The paper discharge device according to any one of supplementary notes 1 to 4.

DESCRIPTION OF SYMBOLS 1 Paper discharge device 10 1st conveyor 11 belts 12 and 13 rollers 20 2nd conveyor 21 belts 22 and 23 rollers 24 Installation base 30 Control part 40 Storage part 50 Interface part 60 Sensor 70 First conveyor conveyance drive part 80 Second conveyor conveyance Drive unit 90 First conveyor lifting drive unit 100 Printing system 110 First printing device 120 First intermediate device 130 Second printing device 140 Second intermediate device P Paper PB Paper bundle

Claims (5)

A conveyance unit that conveys a sheet bundle that is a plurality of stacked sheets,
A drive unit for driving the transport unit,
A control unit for controlling the driving unit,
The control unit determines at least one of a transport speed and a transport acceleration at which the transport unit transports the sheet bundle based on the loaded sheet information of the sheet bundle loaded on the transport unit. Paper ejection device. The sheet discharging device according to claim 1, wherein the loaded sheet information includes at least one of the type of the sheet, the size of the sheet, the direction of the sheet, and the number of sheets stacked. The control unit determines the at least one of the transport speed and the transport acceleration by referring to a table representing a relationship between the loaded paper information and at least one of the transport speed and the transport acceleration. The sheet discharging device according to claim 1, wherein: The control unit determines at least one of the transport speed and the transport acceleration based on the loaded paper information and environmental information of an environment in which the paper ejection device is installed. Item 4. The sheet discharging device according to any one of Items 1 to 3. The transport unit has a first conveyor that transports the sheet bundle, and a second conveyor that is disposed downstream of the first conveyor in the transport direction and transports the sheet bundle,
The drive unit has a first conveyor transport drive unit that drives the first conveyor, and a second conveyor transport drive unit that drives the second conveyor,
The control unit determines at least one of the transport speed and the transport acceleration at which the first conveyor and the second conveyor transport unit transport the sheet bundle based on the loaded paper information. The sheet discharge device according to claim 1.

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