JP2018039193A - Sheet transportation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically change a loading position of a sheet on a paper discharge table after paper discharge depending on property of the sheet to further improve accuracy of paper discharge.SOLUTION: In a sheet transportation device, a paper discharge part 5 for discharging and loading a transported print sheet 41 on a paper discharge table 54 with a paper discharge roll 52 includes: a load current measurement instrument 81 and a paper sensor 83 for identifying property of the print sheet 41; and a control part for controlling a discharge speed of the print sheet 41 by the discharge roll 52 to load the print sheet 41 having different property in the same position on the paper discharge table 54 based on the result from the load current measurement instrument 81 and the paper sensor 83.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sheet conveying device that discharges and stacks sheets (sheets) on a sheet discharge table, and more particularly, to a sheet conveying device that can be stacked in an orderly manner on a sheet discharge table.

  2. Description of the Related Art Image forming apparatuses such as stencil printing apparatuses and ink jet printing apparatuses are provided with a paper feed unit having a paper feed tray for stacking and storing printing paper as recording media. In this sheet feeding unit, a bundle of sheets of a predetermined size is stacked, and the stacked uppermost sheet is picked up by a pickup roll, and is sent out from the sheet feeding tray to the image forming unit through a conveyance path.

  In addition, the image forming apparatus includes a paper discharge unit (sheet conveyance device) that discharges and stacks paper on which an image is formed by the image forming unit on a paper discharge table.

  The paper discharge unit switches the paper discharge speed for each job unit to change the paper position on the paper discharge table after paper discharge (for example, Patent Document 1) or print paper. It is also known that the accuracy of paper discharge can be improved by allowing the user to select the type in advance.

  In addition, a sheet discharging apparatus and an image forming apparatus that can satisfactorily stack all kinds of sheets on a sheet stacking unit have been proposed (for example, Patent Document 2).

JP-A-2005-231895 JP 2010-159124 A

  However, in the method of switching the discharge speed for each job as described in Patent Document 1, it is not possible to identify the properties (characteristics) of the paper such as the thickness and the friction coefficient, which are different for each paper. For this reason, the discharge position on the discharge table varies depending on the properties of the paper, and the discharge alignment may deteriorate.

  Further, in the case of Patent Document 2 in which information related to the type of sheet is input by the user, the user's operation is required, which is troublesome.

  The present invention has been made in view of such a problem, and a sheet conveying apparatus capable of improving the accuracy of a sheet discharge position when a sheet is discharged onto a sheet discharge table by a simple user operation. The purpose is to provide.

  In order to achieve the above object, a first feature of the sheet conveying apparatus according to the present invention is a sheet conveying apparatus that discharges and stacks conveyed sheets onto a sheet discharge table by a sheet discharge unit. Based on a measuring device for measuring the load current value of the motor when feeding the sheet, a sensor for detecting the transmittance of the conveyed sheet, the measurement result of the measuring device and the detection result of the sensor, A discharge speed correction unit that determines a correction value of the discharge speed of the sheet, and a discharge value of the sheet by the discharge unit based on the correction value of the discharge speed of the sheet determined by the discharge speed correction unit. And a control means for controlling the paper speed.

  According to the first feature of the sheet conveying apparatus according to the present invention, a measuring instrument for measuring a load current value of a motor when feeding a sheet, a sensor for detecting a transmittance of a conveyed sheet, and a measuring instrument Based on the measurement result and the detection result of the sensor, a discharge speed correction unit that determines a correction value of the discharge speed of the sheet, and a correction value of the discharge speed of the sheet determined by the discharge speed correction unit Control means for controlling the sheet discharge speed of the sheet discharge means.

  For this reason, it is possible to more accurately identify the properties of the sheet and to control the conveyance speed suitable for the properties of the sheet to further improve the accuracy of paper discharge alignment.

1 is a schematic configuration diagram of a stencil printing apparatus to which a sheet conveying apparatus according to Embodiment 1 of the present invention is applied. 1 is a functional configuration diagram illustrating a functional configuration of a stencil printing apparatus to which a sheet conveying apparatus according to a first embodiment of the present invention is applied. It is explanatory drawing shown in order to demonstrate the measurement operation | movement of the friction coefficient in the stencil printing apparatus to which the sheet conveying apparatus which concerns on Example 1 of this invention is applied. It is explanatory drawing shown in order to demonstrate thickness detection operation | movement with the stencil printing apparatus to which the sheet conveying apparatus which concerns on Example 1 of this invention is applied. FIG. 5 is an explanatory diagram for explaining a discharge speed determination operation in the stencil printing apparatus to which the sheet conveying apparatus according to the first embodiment of the invention is applied. 5 is a flowchart for explaining the flow of processing in the stencil printing apparatus to which the sheet conveying apparatus according to Embodiment 1 of the present invention is applied.

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

  In Embodiment 1 of the present invention, a stencil sheet is made based on an image read from a document, and a printing sheet (sheet) is fed while rotating a drum around which the stencil sheet thus made is wound. An example will be described in which the present invention is applied to a stencil printing apparatus for printing by pressing a printed printing paper against a drum.

<Configuration of stencil printing machine>
A configuration of a stencil printing apparatus to which the sheet conveying apparatus according to the first embodiment of the present invention is applied will be described.

  FIG. 1 is an apparatus configuration diagram illustrating a hardware configuration of a stencil printing apparatus to which a sheet conveying apparatus according to a first embodiment of the present invention is applied.

  As shown in FIG. 1, the stencil printing apparatus 1 includes a plate making unit 2, a printing unit 3, a paper feeding unit 4, a paper discharge unit (sheet conveying device) 5, and a plate discharging unit 6.

  The plate making unit 2 is arranged at a position opposite to the thermal head 23, a base paper storage unit 22 that stores the rolled long stencil sheet 21, a thermal head 23 that is disposed downstream of the base paper storage unit 22, and the thermal head 23. The platen roll 24, a pair of base paper feed rolls 25 disposed downstream of the platen roll 24 and the thermal head 23, a light pulse motor 26 for rotating the platen roll 24 and the base paper feed roll 25, and a pair of A base paper cutter 27 disposed downstream of the base paper feed roll 25.

  The plate making unit 2 conveys the long stencil sheet 21 by the rotation of the platen roll 24 and the base paper feed roll 25, and each dot of the thermal head 23 based on the image data read by the image reading unit (not shown). When the heat generating element selectively generates heat, the stencil sheet 21 is thermally perforated to make a plate, and the stencil sheet 21 thus made is cut with a sheet cutter 27 to produce a stencil sheet 21 having a predetermined length.

  The printing unit 3 includes a drum 32 that rotates in the direction of arrow A in FIG. 1 by the driving force of the main motor 31, and a base paper clamp unit 33 that is provided on the outer peripheral surface of the drum 32 and clamps the front end of the stencil base paper 21. ing.

  The printing unit 3 includes a base paper confirmation sensor 34 that detects whether or not the stencil paper 21 is wound around the outer peripheral surface of the drum 32, a reference position detection sensor 35 that detects the reference position of the drum 32, and a main motor. And a rotary encoder 36 that outputs a pulse signal at a predetermined period in accordance with the rotation of 31. The rotation angle of the drum 32 can be calculated by detecting the output pulse signal of the rotary encoder 36 based on the detection output (reference position pulse signal) of the reference position detection sensor 35.

  Further, the printing unit 3 includes a press roll 37 disposed at a position below the drum 32. The press roll 37 is pressed against the outer peripheral surface of the drum 32 by the driving force of the solenoid unit 38. It is configured to be able to change between a standby position separated from the outer peripheral surface. The press roll 37 is shifted from the standby position to the pressing position in synchronization with the sheet feeding operation from the sheet feeding unit 4, and is positioned at the pressing position only when the printing paper 41 passes through the lower part of the drum 32. It is positioned at the standby position.

  Then, the leading end of the stencil sheet 21 conveyed from the plate making unit 2 is clamped by the stencil sheet clamping unit 33, and the drum 32 is rotated in this clamped state, and the stencil sheet 21 is wound around the outer peripheral surface of the drum 32. Then, the printing paper 41 fed from the paper feeding unit 4 in synchronization with the rotation of the drum 32 is pressed against the stencil paper 21 wound around the drum 32 by a press roll 37, so that the stencil paper is applied to the printing paper 41. Ink is transferred from the 21 perforations and an image is printed.

  The paper feed unit 4 includes a paper feed tray 42 on which the print paper 41 is stacked, primary paper feed rolls 43 and 44 that transport only the uppermost print paper 41 from the paper feed base 42, and the paper width direction. Installed on the drum 32, and a paper separating plate 49 for feeding the printing paper 41 fed from the primary paper feeding rolls 43 and 44 one by one, and the printing paper 41 conveyed by the primary paper feeding rolls 43 and 44 on the drum 32. A pair of secondary paper feed rolls 45 that are transported between the drum 32 and the press roll 37 in synchronization with the rotation, and a paper feed that detects whether or not the print paper 41 has been transported between the pair of secondary paper feed rolls 45. A sensor 46 and a paper presence / absence sensor 48 for detecting the printing paper 41 stacked on the paper feed tray 42 are provided.

  In addition, on the upstream side in the transport direction of the primary paper feed rolls 43 and 44, the print paper 41 that comes in contact among the plurality of print papers 41 placed on the paper feed table 42 faces the downstream side in the transport direction. An upstream assist roll 71 for feeding paper is provided. Further, between the primary paper feed rolls 43 and 44 and the secondary paper feed roll 45 in the transport direction, it is installed coaxially with the paper spreading plate 49 in the paper width direction. A downstream assist roll 73 is provided that conveys the printed paper 41 to the secondary paper feed roll 45 by abutting it from below.

  The rotation of the main motor 31 is selectively transmitted to the primary paper feed rolls 43 and 44 via a paper feed clutch 47. The secondary paper feed roll 45 is configured to transmit the rotation of the motor 75, and the upstream assist roll 71 is configured to transmit the rotation of the motor 72, and the downstream assist The roll 73 is configured to transmit the rotation of the motor 74.

  The paper discharge unit 5 includes a paper separation claw 51 that separates the printed print paper 41 from the drum 32, a paper discharge roll 52 that conveys the print paper 41 separated from the drum 32 by the paper separation claw 51, A paper discharge motor 55 that drives the paper roll 52, a paper jam detection sensor 53 that detects whether the print paper 41 passes through the paper discharge roll 52, and the print paper 41 that is discharged by the paper discharge roll 52. And (41A, 41B).

  The paper discharge roll 52 is provided with a paper discharge fan 52 a that sucks the printing paper 41 toward the paper discharge roll 52 so that the paper discharge roll 52 can discharge the print paper 41.

  The paper jam detection sensor 53 detects whether or not the printing paper 41 printed by the printing unit 3 is correctly conveyed. If the paper jam detection sensor 53 does not detect the conveyance of the printing paper 41 even after a predetermined time has elapsed after printing, it is determined that the printing paper 41 remains in the printing unit 3.

  The plate discharging unit 6 guides the leading end of the stencil sheet 21 unclamped from the outer peripheral surface of the drum 32, and transports the guided stencil sheet 21 while being peeled off from the drum 32, and this plate discharging transport. A stencil box 62 for storing the stencil sheet 21 conveyed by the means 61 and a stencil compression member 63 for pushing the stencil sheet 21 conveyed into the stencil box 62 by the stencil conveying means 61 into the stencil box 62 are provided. Have.

  Further, the stencil printing apparatus 1 to which the sheet conveying apparatus according to the first embodiment of the present invention is applied, for example, as a discriminating unit, when driving the primary paper feeding rolls 43 and 44 for conveying the printing paper 41 is used. A load current measuring device 81 that measures the load current value of the motor 31 and a paper sensor 83 that detects the transmittance of the printing paper 41 conveyed by the primary paper feed rolls 43 and 44 are provided.

  The paper sensor 83 is a transmissive sensor that is provided in the vicinity of, for example, the primary paper feed rolls 43 and 44 and detects the thickness of the print paper 41 according to the amount of light transmitted through the print paper 41.

  The load current value may be measured by measuring a change in the drive current supplied to the main motor 31 when the printing paper 41 is transported by a control unit described later without using the load current measuring device 81. Instead of the primary paper feed rolls 43 and 44, the load current value of the motor 72 that drives the upstream assist roll 71 or the load current value of the motor 74 that drives the downstream assist roll 73 is measured. There may be.

  That is, in the stencil printing apparatus 1 to which the sheet conveying apparatus according to the first embodiment of the present invention is applied, the properties of the printing paper 41 having different properties for each printing paper 41, such as thickness and friction coefficient, are automatically identified. The discharge speed onto the discharge tray 54 is optimized according to the properties of the printing paper 41. As a result, it is possible to further improve the accuracy of paper discharge alignment during sorting without requiring user operation.

  FIG. 2 is a functional configuration diagram illustrating a functional configuration of the stencil printing apparatus 1 to which the sheet conveying apparatus according to the first embodiment of the present invention is applied.

  As shown in FIG. 2, in the first embodiment of the present invention, the stencil printing apparatus 1 includes a storage unit 8, an operation unit 9, and a control unit 10.

  The storage unit 8 stores, for example, the monitored friction coefficient and thickness of the printing paper 41 as parameters, and a threshold value (load current value / transmittance) for identifying the properties of the printing paper 41 based on the parameters. ) Stores a preset identification data table or the like.

  In the identification data table, for example, a correction value for optimizing the conveyance speed of the printing paper 41 according to the property (thickness and / or friction coefficient) of the printing paper 41 is stored. Here, the correction value refers to the conveyance speed (especially, the discharge speed) according to the properties of the print paper 41 so that the paper discharge alignment of the print papers 41A and 41B having different properties on the discharge table 54 is good. ) Is a coefficient for correcting a reference transport speed (for example, a standard discharge speed defined in advance according to the property of the most commonly used normal printing paper 41). is there.

  The operation unit 9 is provided in the upper part of the stencil printing apparatus 1, and includes a start key for starting plate-making and printing, a stop key for stopping plate-making and printing, and a numeric keypad for inputting the number of prints (whichever (Not shown) and the like, and supplies an operation signal based on a user operation to the control unit 10.

  The control unit 10 performs central control of the stencil printing apparatus 1.

  For example, the control unit 10 performs the plate making unit 2, the printing unit 3, the paper feeding unit 4, the paper discharging unit 5, the plate discharging unit 6, and the operation unit 9 based on a task that is a predetermined unit process. And control.

  The control unit 10 further includes a paper discharge speed correction unit 85.

  The control unit 10 monitors the friction coefficient of the printing paper 41 by, for example, measuring the load current value of the main motor 31 by the paper discharge speed correction unit 85 and determines the thickness of the printing paper 41 from the analog value of the paper sensor 83. Monitor it. Based on the result of monitoring using the friction coefficient and thickness of the printing paper 41 as parameters, the paper discharge speed correction unit 85 refers to, for example, an identification data table stored in the storage unit 8 and prints having different properties. For example, a correction value for optimizing the paper discharge speed of the printing paper 41 is read from the identification data table so that the paper discharge alignment on the paper discharge tray 54 is good. Then, according to the correction value, for example, the control unit 10 controls the paper discharge motor 55 that drives the paper discharge roll 52.

  By monitoring the two parameters of the coefficient of friction and the thickness, the properties of the printing paper 41 can be identified in more detail and more accurately.

  FIG. 3 is an explanatory diagram for explaining a load current value measuring operation for monitoring the friction coefficient of the printing paper 41.

  That is, in the paper discharge speed correction unit 85, for example, as shown in FIG. 3, when the load current value of the main motor 31 is higher than the threshold value A by the load current measuring device 81, the paper has a high friction coefficient. If it is lower than the threshold A, it is identified as a sheet having a small friction coefficient. It can be presumed that the gripping force by the paper discharge roll 52 becomes stronger as the friction coefficient is larger, and the grip force by the paper discharge roll 52 becomes smaller as the friction coefficient is smaller.

  FIG. 4 is an explanatory diagram for explaining the transmittance detection operation for monitoring the thickness of the printing paper 41.

  That is, in the paper discharge speed correction unit 85, for example, as shown in FIG. 4, when the analog value (transmittance) detected by the paper sensor 83 is higher than the threshold value B, the paper discharge speed correction unit 85 is thin. If it is lower than B, it is identified as cardboard.

  The threshold values A and B, correction values, and the like are set based on the friction coefficient and thickness of the normal printing paper 41, and may be set by the manufacturer. Depending on the nature of the printing paper 41 used frequently by the user, it may be set as appropriate.

  FIG. 5 is a diagram illustrating an example of an identification data table stored in the storage unit 8 included in the sheet conveying apparatus according to the first embodiment of the present invention.

  When the load current value is high, the friction coefficient of the conveyed printing paper 41 is large, so that the gripping force by the paper discharge roll 52 is increased accordingly. For this reason, since the slip of the print paper 41 is small, the speed of the print paper 41 discharged on the paper discharge tray 54 is discharged at a speed close to the rotational speed of the paper discharge roll 52. Therefore, as shown in FIG. 5, the discharge speed correction value is set to be lower as the load current value is higher.

  Moreover, since the paper is thin when the transmittance is high, the stiffness is so weak that it is difficult to discharge the paper far away. Therefore, as shown in FIG. 5, the correction value of the paper discharge speed is set to be higher as the transmittance is higher.

  Then, the paper discharge speed correction unit 85 refers to the identification data table DT shown in FIG. 5 and determines an optimal discharge speed correction value according to the properties of the printing paper 41.

  In this way, regardless of the nature of the printing paper 41, the printing paper 41 is considered in consideration of the surface state (friction coefficient) and thickness of the printing paper 41 as compared with the case where the rotation speed of the paper discharge roll 52 is constant. Since the optimum correction value of the discharge speed according to the property of 41 is determined, the print sheet 41 can be discharged to a more appropriate discharge position on the discharge table 54.

<Operation of Stencil Printing Apparatus 1>
Next, the operation of the stencil printing apparatus 1 will be described.

  FIG. 6 is a flowchart for explaining the flow of processing related to the printing operation of the stencil printing apparatus 1 to which the sheet conveying apparatus according to the first embodiment of the present invention is applied.

  First, when the user operates the start key of the operation unit 9, the printing operation is started in the stencil printing apparatus 1 (step S101). Then, based on the control by the control unit 10, the stencil sheet 21 is prepared in the plate making unit 2 and printed from the paper supply unit 4 to the printing unit 3 in synchronization with the printing operation in the printing unit 3. The paper 41 is fed.

  Along with the feeding operation of the printing paper 41, as shown in FIG. 3, the load current value of the main motor 31 for driving the primary feeding rolls 43 and 44 is measured by the load current measuring device 81 (step S103), as shown in FIG. 4, the transmittance of the conveyed printing paper 41 is detected by the paper sensor 83 (step S105).

  Thereafter, the paper discharge speed correction unit 85 of the control unit 10 determines a correction value of the paper discharge speed according to the properties of the printing paper 41.

  That is, the paper discharge speed correction unit 85 performs a paper identification process (step S107). Specifically, if the measurement result (friction coefficient) of the load current value of the main motor 31 by the load current measuring device 81 exceeds the threshold value A, the paper discharge speed correction unit 85 determines the load current value (friction coefficient). ) Is identified as a high sheet, and if it is less than the threshold A, it is identified as a sheet having a low load current value (friction coefficient). Further, if the result of the transmittance detection of the printing paper 41 by the paper sensor 83 exceeds the threshold value B, the paper discharge speed correction unit 85 identifies that the paper has a high transmittance (thin). If it is less than the threshold value B, it is identified as a sheet with low (thick) transmittance.

  Then, the paper discharge speed correction unit 85 refers to the identification data table DT read out from the storage unit 8 and determines a correction value of the paper discharge speed for the print paper 41 based on the identification result ( Step S109).

  Next, the paper discharge speed correction unit 85 sets the paper discharge speed for discharging the printed paper 41 after printing onto the paper discharge tray 54 in accordance with the determined discharge speed correction value. Determine (step S111). Specifically, the paper discharge speed correction unit 85 multiplies the reference paper discharge speed by the correction value of the paper discharge speed determined in step S109 to discharge paper on the paper discharge tray 54. Determine the speed. At this time, the control unit 10 may have a reference discharge speed as a default value, or a reference value of the discharge speed stored in advance in the storage unit 8 may be read.

  The above-described processing up to the determination of the paper discharge speed is performed until the printing processing on the printing paper 41 in the printing unit 3 is completed.

  In this way, when the discharge speed of the printing paper 41 is determined in the discharge speed correction unit 85, the control unit 10 matches the timing of the printing operation in the printing unit 3 with the determined discharge. According to the speed, the paper discharge motor 55 that drives the paper discharge roll 52 of the paper discharge unit 5 is controlled (step S113).

  As a result, the print paper 41 is discharged onto the paper discharge tray 54 at a paper discharge speed optimized according to its properties (surface condition and thickness), and all the print papers 41 are aligned at the same paper discharge position. Loaded.

  For example, as shown in FIG. 1, in the case of a printing paper 41A identified as having a lower transmittance (thickness) than that of a normal printing paper 41 and a high load current value (high friction coefficient), Therefore, the output of the paper discharge motor 55 is weakened by the correction value (0.8) and the paper discharge speed is reduced, so that an appropriate value on the paper discharge table 54 is obtained. Discharged to the position.

  On the other hand, in the case of the printing paper 41B identified as having a higher transmittance (thinner thickness) than that of the normal printing paper 41 and a low load current value (small friction coefficient), the printing paper 41B is compared with the normal printing paper 41. Since the output of the paper discharge motor 55 is increased by the correction value (1.2) and the paper discharge speed is increased, the paper is discharged to an appropriate position on the paper discharge tray 54. .

  Such processing is repeated for each printing paper 41, for example, so that a plurality of printing papers 41 having different properties can be stacked at substantially the same paper ejection position on the paper ejection tray 54.

  For example, in the bundle of print sheets 41 stacked on the sheet feed table 42 of the sheet feed unit 4, if all the print sheets 41 have the same properties (characteristics), this is not a problem, but the properties are different. Even when the print sheets 41 are mixed, it is possible to suppress variations in the discharge positions of the print sheets 41 discharged onto the discharge table 54.

  That is, in the stencil printing apparatus 1 to which the sheet conveying apparatus according to the first embodiment of the present invention can be applied, the properties of the printing paper 41 such as the thickness and the friction coefficient, which are different for each printing paper 41, are automatically identified. The paper discharge speed onto the paper discharge stand 54 is optimized according to the properties of the print paper 41. As a result, regardless of the nature of the printing paper 41, all the printing papers 41 can be stacked at the same paper discharge position on the paper discharge tray 54.

  Further, since the property of the printing paper 41 is identified by a combination of a plurality of parameters, it can be identified in more detail and more accurately.

  In addition, since the paper discharge position can be changed by a simple process of changing the paper discharge speed based on the correction value, no user operation is required, and the accuracy of paper discharge alignment during sorting can be further improved.

  As described above, according to the stencil printing apparatus 1 to which the sheet conveying apparatus according to the first embodiment of the present invention can be applied, the properties of the printing paper 41 such as the thickness and the friction coefficient are automatically identified, and the properties of the printing paper 41 are determined. Accordingly, it is possible to optimize the discharge speed onto the discharge table 54. As a result, regardless of the nature of the printing paper 41, all the printing papers 41 can be stacked at the same paper discharge position on the paper discharge tray 54. Therefore, it is possible to further improve the accuracy of paper discharge alignment during sorting while eliminating the need for user operation.

  In the first embodiment of the present invention, the correction value for the paper discharge speed is determined based on the transmittance (thickness) and the load current value (friction coefficient) by referring to the identification data table DT. However, the correction value for the paper discharge speed may be determined based on one of the transmittance (thickness) and the load current value (friction coefficient).

  In the first embodiment of the present invention, a stencil sheet is made based on an image read from an original, and a printing sheet (printing medium) is pressed while rotating a drum around which the stencil sheet is made. However, the present invention is not limited to this and may be an image forming apparatus of another printing method such as an ink jet method or a laser method. That is, any image forming apparatus having a paper discharge unit may be used.

DESCRIPTION OF SYMBOLS 1 ... Stencil printing apparatus 2 ... Plate making part 3 ... Printing part 4 ... Paper feed part 5 ... Paper discharge part 6 ... Plate discharging part 8 ... Memory | storage part 9 ... Operation part 10 ... Control part 31 ... Main motor 32 ... Drum 34 ... Base paper confirmation Sensor 35 ... Reference position detection sensor 36 ... Rotary encoder 37 ... Press roll 41, 41A, 41B ... Printing paper 42 ... Paper feed tray 43,44 ... Primary paper feed roll 45 ... Secondary paper feed roll 46 ... Feed sensor 47 ... Feeding clutch 48 ... Paper presence / absence sensor 52 ... Ejecting roll
53 ... Paper jam detection sensor 54 ... Discharge stand 55 ... Discharge motor 71 ... Upstream assist roll 72, 74,75 ... Motor 73 ... Downstream assist roll 81 ... Load current measuring device 83 ... Paper sensor 85 ... Discharge speed Correction unit DT ... Data table for identification

Claims (1)

A sheet conveying apparatus for discharging and stacking a conveyed sheet on a sheet discharge table by a sheet discharge unit,
A measuring instrument for measuring the load current value of the motor when feeding the sheet;
A sensor for detecting the transmittance of the conveyed sheet;
A discharge speed correction unit that determines a correction value of the discharge speed of the sheet based on the measurement result of the measuring device and the detection result of the sensor;
Control means for controlling the discharge speed of the sheet by the discharge means based on a correction value of the discharge speed of the sheet determined by the discharge speed correction section;
A sheet conveying apparatus comprising:

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