Printing system including static eliminator, control method of the same and program

Abstract

To solve the problem that an optimal voltage value applied for static elimination exists depending on use environment and the type of sheets, and when printing is performed using a plurality of types of sheets, the voltage value needs to be set to an optimal voltage value according to the change of the type of printing sheets.SOLUTION: A printing system including a printer for executing printing processing on a sheet and a static eliminator for performing static elimination of the printed sheet has: specification means for specifying the type of sheets on the basis of a signal from a sensor; and setting means for setting a static elimination adjustment value of the static elimination processing on the basis of the specified type of sheet.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a printing system including a static eliminator that eliminates static electricity from a charged recording medium, and a control method and program for the printing system. [Background technology]

[0002] Recording media (hereafter referred to as "sheets") used in printing work are transported in a statically charged state due to residual charge during the electrophotographic process or slight friction with transport rollers and guides that occurs during sheet transport. This static electricity can cause sheets to stick together. It can also cause dust and paper powder to adhere to the finished product, resulting in a decrease in the quality of the finished product. Here, ordinary paper and the like has a low electrical resistance of its own, and charges move easily within the paper, so the amount of charge itself is small and dissipates quickly. However, sheets made of synthetic resin (plastic), such as cardboard, synthetic paper, and coated paper, have a high electrical resistance of their own, and charge movement is less likely to occur within the sheet. As a result, sheets such as cardboard, synthetic paper, and coated paper tend to be more likely to become charged and to retain charge. In addition, it is generally known that they are easily affected by the environment, especially humidity, and that the lower the humidity, the less discharged into the air, making them more likely to become charged with static electricity. If post-processing is performed while the sheets are stuck together, this not only affects the sheet alignment process and reduces the quality of the post-processing, but also may induce jams due to poor paper feeding or transport during post-processing in the offline finisher. Therefore, it is desirable to remove static electricity from the sheets after the printing process before performing post-processing. In view of this, a proposal has been made to apply a voltage to a pair of transport rollers located downstream in the sheet transport direction to cancel the electric charge on the sheet (see Patent Document 1). There has also been a proposal to use a media sensor equipped with a light-emitting element such as an LED and a light-receiving element such as a photodiode, which detects the characteristics of a sheet, such as its thickness and surface condition, based on the amount of reflected light received by irradiating the sheet as it passes (see Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-258881 [Patent Document 2] JP 2017-138406 A Summary of the Invention [Problem to be solved by the invention]

[0004] The discharge by applying a voltage to the conveying roller (hereinafter referred to as "discharging roller") is performed by applying a charge opposite to the charge on the sheet to the sheet via the discharging roller, thereby canceling the static electricity. Therefore, the discharge control by the discharging roller (application of a charge opposite to that of the sheet to the discharging roller) needs to be performed according to the amount of charge on the sheet. In other words, there is an optimal charge adjustment value for static elimination for each printing environment, such as the characteristics of the sheet and humidity. If static elimination control is performed on a sheet in an inappropriate charge adjustment state, it may cause charging instead, which may lead to further sticking of the sheet. In addition, when printing using multiple types of sheets, if the user does not notice the change in the type of sheet and continues printing without changing the static elimination adjustment value, the sheet will be discharged without being static eliminated. Thus, the conventional technology has a problem in that it is not possible to switch and perform appropriate static elimination control according to the multiple types of sheets. In view of the above problems, the present invention aims to provide a mechanism for appropriately eliminating static electricity from printed matter by identifying the type of sheet using a sensor and setting a static elimination control setting value according to the type of sheet. [Means for solving the problem]

[0005] The present invention is a printing system comprising a printing device that performs a printing process on a sheet and a static elimination device that performs a static elimination process on the printed sheet, and is characterized in having an identification means for identifying the type of sheet based on a signal from a sensor, and a setting means for setting a static elimination adjustment value for the static elimination process based on the identified type of sheet. Effect of the Invention

[0006] According to the present invention, even when printing on a plurality of types of sheets, the type of sheet can be identified by a sensor, and a static elimination control setting value suitable for that type of sheet can be set, thereby enabling static elimination of the printed matter to be performed appropriately. [Brief description of the drawings]

[0007] [Figure 1] Overall configuration diagram of the system according to this embodiment [Diagram 2] Block diagram of the hardware configuration of the printing system [Diagram 3] Cross-section of the printing system [Figure 4] FIG. 1 is a diagram of an operation unit provided in a printing device. [Diagram 5] Block diagram of the hardware configuration of the static eliminator [Figure 6] FIG. 1 is a diagram of an operation unit provided in a static eliminator. [Figure 7] Schematic diagram of static elimination process [Figure 8] Media sensor schematic diagram [Figure 9] Flowchart of printing and static elimination processing according to an embodiment [Figure 10] Static electricity removal setting list [Figure 11] 11 is a flowchart of a printing and static elimination process according to another embodiment. [Figure 12] Static electricity removal setting list DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the following embodiments do not limit the invention according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. Overall system configuration FIG. 1 shows the overall configuration of the simplest system of this embodiment, which includes a printing system 1000 and a client computer 102 (hereinafter referred to as a “PC”), which are connected to each other via a network 101. The PC 102 can then transmit PDL (Page Description Language) code data, which is a print job, to the printing system 1000 via the network 101 .

[0009] Printing system hardware configuration (block diagram) Next, the hardware configuration of the printing system 1000 will be described with reference to the system block diagram of FIG. The printing system 1000 includes a printing apparatus 100 and a sheet processing apparatus 200, which are enclosed by a dotted line in the figure. Any number of sheet processing devices 200 can be connected to the printing device 100. In this embodiment, an MFP (Multi Function Peripheral) having multiple functions such as a copy function and a printer function will be described as an example of the printing device 100. However, the printing device 100 may be a single-function printing device having only a copy function or only a printer function. In this embodiment, as an example, the printing system 1000 is assumed to include various components described below. The printing system 1000 is configured so that sheet processing for sheets printed by the printing device 100 can be performed by a sheet processing apparatus 200 connected to the printing device 100. However, it is also possible to configure the printing system 1000 using only the printing device 100 without connecting the sheet processing apparatus 200. The sheet processing apparatus 200 is configured to be able to communicate with the printing apparatus 100, and can receive instructions from the printing apparatus 100 and execute sheet processing as described below. A scanner unit 201 reads an image on a document, converts it into image data, and transfers it to other units. The external I / F 202 transmits and receives data to and from other devices connected to the network 101 . The printer unit 203 prints an image based on the input image data onto a sheet. 4, the operation unit 204 has a hard key input unit 402 and a touch panel unit 401, and receives instructions from a user via them. The operation unit 204 also displays various information on the touch panel unit 401 that the operation unit 204 has. The control unit 205 is a so-called CPU (Central Processing Unit) and controls the overall processing and operation of various units included in the printing system 1000. In other words, it also controls the operation of the printing apparatus 100 and the sheet processing apparatus 200 connected to the printing apparatus 100. The ROM 207 stores various computer programs executed by the control unit 205. For example, the ROM 207 stores programs for causing the control unit 205 to execute various processes in flowcharts described below, and display control programs required to display various setting screens described below. The ROM 207 also stores programs for the control unit 205 to interpret PDL code data received from the PC 102 and expand it into raster image data. The ROM 207 also stores a boot sequence, font information, and the like. The RAM 208 stores image data and PDL code data sent from the scanner unit 201 and the external I / F 202, various programs loaded from the ROM 207, and setting information. The RAM 208 also stores information related to the sheet processing apparatus 200 (such as information related to the type and function of each sheet processing apparatus 200 connected to the printing apparatus 100). The control unit 205 can use the information related to the sheet processing apparatus 200 stored in the RAM 208 for control.

[0010] The HDD (hard disk drive) 209 is composed of a hard disk and a drive unit that reads and writes data to the hard disk. The HDD 209 is a large-capacity storage device for storing image data input from the scanner unit 201 and compressed by the compression / decompression unit 210. The control unit 205 can print image data stored in the HDD 209 by the printer unit 203 based on an instruction from a user. The HDD 209 is also used as a spooler, and the control unit 205 can manage PDL code data received from the PC 102 as a print job and store it in the HDD 209. The control unit 205 can also manage the print jobs stored in the HDD 209, and can also acquire the number of print jobs stored and setting information made for the print jobs. The compression / decompression unit 210 compresses and decompresses image data stored in the RAM 208 and HDD 209 using various compression methods such as JBIG and JPEG.

[0011] Printing system mechanism (cross-section) Next, the configuration of the printing system 1000 will be described with reference to the cross-sectional view of FIG. 3 is a cross-sectional view of the printing apparatus 100 and a sheet processing apparatus 200 connected to the printing apparatus 100. In this figure, the sheet processing apparatus is configured to include a static eliminator 200-3a and a saddle stitcher 200-3b. (Printing device) First, the printing device 100 will be described. An automatic document feeder (ADF) 301 separates a stack of documents set on a loading surface of a document tray in page order starting from the first page, and conveys the documents onto a document glass platen for scanning by a scanner 302 . The scanner 302 reads an image of a document conveyed onto a glass platen, and converts the image into image data by a CCD. A rotating polygon mirror (polygon mirror or the like) 303 emits a beam of light, such as a laser beam, modulated according to image data, and irradiates the beam as reflected scanning light onto a photosensitive drum 304 via a reflecting mirror. A latent image formed on the photosensitive drum 304 by the laser beam is developed with toner, and the toner image is transferred to a sheet material attached on a transfer drum 305. A full-color image is formed by sequentially executing this series of image formation processes for yellow (Y), magenta (M), cyan (C), and black (K) toners. After four image formation processes, the sheet material on the transfer drum 305 on which the full-color image has been formed is separated by a separation claw 306 and conveyed to a fixing device 308 by a pre-fixing conveyor 307. The fixing unit 308 is made up of a combination of rollers and belts, and has a built-in heat source such as a halogen heater, and melts and fixes the toner on the sheet material onto which the toner image has been transferred, by using heat and pressure.

[0012] The discharge flapper 309 is configured to be swingable around a swing axis and determines the conveying direction of the sheet material. When the discharge flapper 309 swings clockwise in the figure, the sheet material is conveyed straight and is discharged outside the machine by the discharge rollers 310. The control unit 205 controls the printing device 100 to perform single-sided printing through the above-described series of sequences. On the other hand, when images are to be formed on both sides of the sheet material, the discharge flapper 309 swings counterclockwise in the figure, and the sheet material is changed course downward and sent to the double-sided conveying section. The double-sided conveying section includes an inversion flapper 311 , an inversion roller 312 , an inversion guide 313 , and a double-sided tray 314 . The reversing flapper 311 swings about a swing shaft to determine the conveying direction of the sheet material. When processing a double-sided printing job, the control unit 205 controls the printer unit 203 to swing the inversion flapper 311 counterclockwise in the figure after printing has been completed on the first side of the sheet, and to send the sheet to the inversion guide 313 via the inversion rollers 312. Then, in a state where the rear end of the sheet material is sandwiched between the reversing rollers 312, the reversing rollers 312 are stopped once, and the reversing flapper 311 continues to oscillate in the clockwise direction in the figure. Then, the reversing rollers 312 are rotated in the reverse direction. As a result, the sheet is switched back and conveyed, and the sheet is controlled so that it is guided to the double-sided tray 314 with the rear end and the front end of the sheet switched. The sheet material is temporarily stacked on the double-sided tray 314 , and then the sheet material is fed again to the registration rollers 316 by the re-feed rollers 315 .

[0013] At this time, the sheet material is fed so that the side opposite to the first side transfer process faces the photosensitive drum. Then, a second image is formed on the second side of the sheet in a manner similar to the process described above. Then, images are formed on both sides of the sheet material, and the sheet undergoes a fixing process, and is discharged from inside the main body of the printing apparatus 100 to the outside of the apparatus via a paper discharge roller 310 . The control unit 205 controls the printing device 100 to perform double-sided printing according to the above-described series of sequences. The printing device 100 also has a paper feed section that stores sheets required for printing. The paper feed section includes paper feed cassettes 317 and 318 (each capable of accommodating, for example, 500 sheets), a paper feed deck 319 (capable of accommodating, for example, 5,000 sheets), a manual feed tray 320, and the like. The sheet feed cassettes 317, 318 and the sheet feed deck 319 can be used to set various sheets of different sizes and materials separately for each sheet feed section. Moreover, various types of sheets, including special sheets such as overhead projector sheets, can be set on the manual feed tray 320.

[0014] (static eliminator) Next, the static eliminator 200-3a will be described. First, FIG. 5 is a system block diagram of the hardware configuration of the static eliminator 200-3a. The static eliminator also has a control unit 501 separate from the printing device 100, and this control unit 501 controls the entire static eliminator 200-3a while communicating with the control unit 205 of the printing device 100 in Fig. 2 via a bus (not shown). The control unit 501 is also a so-called CPU. The operation unit 502 has a configuration as shown in FIG. 6, and the user can perform settings for the static eliminator 200-3a via the operation unit 502. [Operation section] The mode setting switch 601 in FIG. 6 switches whether or not static elimination is performed by the static elimination device 200-3a (ON / OFF), and the control unit 501 controls the static elimination processing unit 503 described later to execute the static elimination processing only when the switch is ON. In addition, an adjustment dial 602 consisting of a thumb rotary switch adjusts the strength of the static elimination control performed when the mode setting switch 601 is ON, and is controlled by the control unit 501 so as to be effective only when the mode setting switch 601 is ON. The static elimination processing unit 503 is composed of a static elimination roller 322, an ionizer 323, and a voltage application controller 321, which will be described later, and is responsible for eliminating static electricity from the conveyed sheet. The control unit 501 realizes control of applying a voltage to the static elimination roller 322 and the ionizer 323 via the voltage application controller 321. The ROM 504 stores a boot program for the static elimination device 200-3a, a control program for the operation unit 204, a static elimination processing program for the static elimination processing unit 503, etc. Then, the control unit 501 loads necessary programs from the ROM 504 into the RAM 505 as appropriate and executes them.

[0015] <Static charge removal treatment> Here, the charge removal process performed by the charge removal unit 503 will be described with reference to FIG. FIG. 7 is a diagram showing a schematic diagram of a state in which a charge eliminating process is performed in the charge eliminating device 200-3a on a sheet that has been printed by the printing device 100. In FIG. First, the sheet 701 passes through a media sensor 800, and is then conveyed via a conveying path to a developing and transferring section consisting of a photosensitive drum 304 and a transfer drum 305, where toner is applied to the sheet. The charged toner 702 placed on the sheet is negatively charged, and the sheet is then fixed through the fixing device 308 and conveyed to the charge removing device 200-3a with the print surface 703 side negatively charged. The charge elimination device 200-3a includes a positively charged charge elimination roller 322, which applies a positive charge to the negatively charged print surface 703 by contact elimination with the roller, thereby eliminating the charged state. However, it is expected that negative charges that could not be completely removed by the charge removal process using the charge removal roller 322, or conversely, positive charges that have been charged, will remain on the sheet 705 after it has passed through the charge removal roller. Therefore, the static eliminator 200 - 3 a in this embodiment further includes an ionizer 323 downstream of the static elimination roller 322 . The ionizer 323 is a device that generates a corona discharge by applying a voltage to an electrode needle provided within the device, and uses the ions thus generated to eliminate the charge. In this manner, the static electricity is roughly eliminated by the static elimination roller 322, and the remaining charge is adjusted by the ionizer 323, so that the sheet 707 after the static elimination process discharged from the static eliminator 200-3a is in a state where the static electricity has been eliminated. Returning to the explanation using the cross-sectional view of Figure 3, the static elimination device 200-3a has a static elimination roller 322 and its paired roller, and the sheet transported to the static elimination device 200-3a is transported while being clamped between both rollers, and rough static elimination is performed by the static elimination roller 322 described above. Thereafter, the wafer is transported outside the apparatus by transport rollers 324 while an ionizer 323 removes residual charge from the wafer.

[0016] (Saddle stitching machine) Next, the saddle stitching machine 200-3b will be described. The sheet processing by the saddle stitching machine 200-3b includes, for example, saddle stitching, punching, cutting, shift discharge, folding, and stapling. Here, these jobs are referred to as "saddle stitching jobs." When processing a saddle stitching job, the control unit 205 first conveys the sheets of this job printed by the printing device 100 to the saddle stitching machine 200-3b, and then the control unit 205 causes the saddle stitching machine 200-3b to process the sheets of this job. Then, the control unit 205 holds the printed matter of the saddle stitching job, which has been subjected to sheet processing by the saddle stitching machine 200-3b, in the discharge destination Z of the saddle stitching machine 200-3b. Note that there are multiple discharge destination candidates for the discharge destination Z. This is used when the saddle stitching machine 200-3b can perform multiple types of sheet processing and a discharge destination is assigned for each sheet processing. In this embodiment, a detailed description of the transport procedure of the saddle stitching job will be omitted.

[0017] Media sensor structure The sheet type determination process performed by the media sensor 800 will be described with reference to FIG. An LED 801 as a light emitting element and a photodiode 802 as a light receiving element are disposed inside the media sensor 800. The amount of reflected light of the light emitted by the LED 801 can be detected by the photodiode 802. Also, a guide portion 803 into which the sheet 701 enters is provided. The control unit 205 receives the input signal of the photodiode 802 as an output value (signal) of the media sensor 800. The control unit 205 can determine the type of the sheet being fed (the material and thickness of the sheet 701) according to the difference in the received value for each sheet. The control unit 205 optimally controls the image forming speed and the temperature of the fixing unit 308 in accordance with the type of sheet detected here. By using the media sensor 800 to identify the type of sheet, the user does not need to be aware of or set the type of sheet. Furthermore, by using the media sensor 800 to identify the type of sheet, the static elimination adjustment value set in the static elimination roller of the static elimination device 200-3a is optimally controlled. The above-described configuration of media sensor 800 is merely an example, and the present invention is not limited to this configuration. For example, in addition to the light-emitting element and light-receiving element described in the present invention, a method of combining an ultrasonic sensor such as a piezoelectric element is also effective.

[0018] Printing, static elimination (sheet type determination) Next, the printing and static electricity removal process in this embodiment will be described with reference to the flowchart in FIG. The flowchart in FIG. 9 is implemented by the control unit 205 reading a program stored in the ROM 207 into the RAM 208 and executing it. In S901, the control unit 205 of the printing device 100 determines whether a print job has been submitted. If a print job has not been submitted (No in S901), the control unit 205 waits until a print job is submitted, and if a print job has been submitted (Yes in S901), the control unit 205 advances the process to S902. In S902, the control unit 205 interprets the received print job, determines the sheet size to be used for printing, determines the paper discharge port, and selects one of the paper feed cassettes 317 and 318, the paper feed deck 319, and the manual feed tray 320 to start paper feeding. In S903, the sheet is passed through the media sensor 800, and the control unit 205 identifies the type of the sheet by receiving the output value of the media sensor 800. The type of the sheet indicates the thickness of the sheet and the smoothness of the surface of the sheet. In S904, the control unit 205 obtains from the HDD 209 the discharge setting list 1000L, which is composed of the necessity of discharge processing and the discharge adjustment value according to the type of sheet, and searches for an item corresponding to the type of sheet identified in S903 to determine the necessity of discharge processing and the discharge adjustment value. The static elimination setting list 1000L which requires static elimination processing is defined in advance and stored in the HDD 209, or is created and stored by the user. In S905, if it is determined that the static elimination process is required (Yes in S905), the control unit 205 advances the process to S906, and if not (No in S905), the control unit 205 advances the process to S912. In S906, the control unit 205 suspends the processing of the print job. In S907, the control unit 205 searches the static elimination setting list 1000L for the type of sheet specified in S903, and if it is determined that a static elimination adjustment value for the corresponding item exists (Yes in S907), the control unit 205 advances the process to S908. If it is determined that a static elimination adjustment value for the corresponding item does not exist (No in S907), the control unit 205 advances the process to S909. In S908, the control unit 205 sets the static elimination adjustment value of the static elimination roller 322 acquired from the static elimination setting list 1000L in the voltage application controller 321, and the process proceeds to SS911. 10, if there is no static elimination adjustment value like item 1001 in the static elimination setting list 1000L, and if no static elimination adjustment value has been set in S907, the next process of S909 is performed. In S909, the control unit 205 displays on the operation unit 204 a message (not shown) indicating that the static elimination adjustment value cannot be set (cannot be acquired), and displays a message urging the user to manually set the static elimination adjustment value using the mode setting switch 601. In the next step S910, the user sets the static electricity removal adjustment value using the mode setting switch 601, and then issues a command to start printing from the operation unit 204, whereupon the control unit 205 advances the process to S911. In S911, the control unit 205 releases the pause of the print job, and the process proceeds to S912. In S912, the control unit 205 executes printing, and the process proceeds to S913. In S913, the processes from S902 onwards are repeated until printing of all pages is completed, and the above processes are terminated. If it is determined in S903 that the previous sheet is the same type of sheet, the processes in S904 to S911 may be omitted and the print process may be executed in S912 with the static elimination adjustment value settings of the previous sheet. This eliminates the need to temporarily stop the process, thereby shortening the processing time.

[0019] (Static charge removal setting list) FIG. 10 shows an example of a static elimination setting list 1000L referenced in determining the necessity of static elimination based on the type of sheet detected and identified by the media sensor 800 in S904 of FIG. 9 and in determining the static elimination adjustment value. The static elimination setting list 1000L is made up of the types of sheets that can be detected and identified by the media sensor 800, whether static elimination is necessary depending on the type of sheet, and static elimination adjustment values ​​that indicate the strength of static elimination control when static elimination is necessary. Although examples of types of sheets that can be identified by the media sensor 800 include thin paper, regular paper, and thick paper, classification based on units that can be detected by the media sensor 800 may also be used. As described above, the setting values ​​for the static elimination control suitable for the type of sheet are determined based on the determination result of the type of sheet by the media sensor 800 and the static elimination setting list 1000L, and it is possible to start the printing process after setting the static elimination settings.

[0020] [Second embodiment] In the first embodiment, a case has been described in which the type of sheet is identified using the media sensor 800 and static elimination settings are performed. In the second embodiment, a case will be described in which a static elimination control setting value suitable for the humidity measured by a hygrometer is additionally determined, and static elimination settings are performed before starting print processing. In the second embodiment, the hardware configuration of the device is the same as that of the first embodiment, and a hygrometer is additionally provided. Detailed description of the same configuration as that of the first embodiment will be omitted.

[0021] Printing, static elimination The printing and static electricity removal process in the second embodiment will be described with reference to the flowchart in FIG. The flowchart in FIG. 11 is implemented by the control unit 205 reading a program stored in the ROM 207 into the RAM 208 and executing it. 11 are similar to the processing in the flowchart of FIG. 9, except for S1101 to S1103, and therefore the different points will be mainly described below. In S903, the control unit 205 receives the output value of the media sensor 800 to identify the type of sheet, and the process proceeds to S1101. In S1101, the static elimination setting list 1200L in FIG. 12, which is composed of the necessity of static elimination processing according to the type of sheet and the static elimination adjustment value, is read from the HDD 209, and the item corresponding to the type of sheet identified in S903 is searched for to determine only whether static elimination processing is necessary. Thereafter, in S905, it is determined that a charge removal process is necessary, and after the print job is temporarily suspended in S906, in S1102, the control unit 205 measures the humidity during printing using a hygrometer 710 (not shown) installed in the printing apparatus 100. An item corresponding to the measured humidity is searched for in S1103, and if a corresponding static elimination adjustment value is found in S907, the static elimination adjustment value is set in the static elimination roller 322 in S908. As described above, the difference from FIG. 9 is that in addition to identifying the type of sheet by the media sensor 800, the static electricity removal adjustment value is determined based on the humidity measured by the hygrometer 710. In addition, after determining whether or not static electricity is required in S1101, the print job is temporarily stopped in S906, and then the humidity is measured in S1102, but the humidity measurement may be performed in parallel with the identification of the type of sheet by the media sensor, which can omit the process of S1102 and shorten the period during which the job is temporarily stopped.

[0022] (Static charge removal list) FIG. 12 shows an example of a static elimination setting list 1200L referenced in determining whether static elimination is necessary based on the type of sheet identified by the media sensor 800 in S1101 of FIG. 11, and in determining the static elimination adjustment value based on humidity in S1103 of FIG. The static elimination setting list 1200L is composed of the “type of sheet” that can be identified by the media sensor 800, the “humidity” at the time of printing measured by the hygrometer 710, the “necessity of static elimination” according to the type of sheet and humidity, and a “static elimination adjustment value” that indicates the strength of static elimination control when static elimination is required. Although examples of types of sheets that can be identified by the media sensor include thin paper, regular paper, and thick paper, other classifications based on units that can be detected by the media sensor 800 may be used.

[0023] As described above, according to the second embodiment, it is possible to determine the setting value of the static electricity removal control suitable for the type of sheet and humidity based on the results of the determination of the type of sheet by the media sensor and the humidity measurement, and to start the printing process after setting the static electricity removal setting. (Other Examples) The present invention can also be realized by a process in which a program for implementing one or more of the functions of the above-described embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program. The present invention can also be realized by a circuit (e.g., ASIC) that implements one or more of the functions. The disclosure of this embodiment includes the following configuration, method, and program. (Configuration 1) A printing system including a printing device that performs a printing process on a sheet and a static elimination device that performs a static elimination process on the printed sheet, A means for identifying the type of sheet based on a signal from the sensor; a setting unit for setting a charge removal adjustment value for the charge removal process based on the identified type of sheet; A printing system comprising: (Configuration 2) The setting means searches the static elimination setting list for an item corresponding to the type of sheet specified by the specifying means, and sets a static elimination adjustment value for the static elimination process of the corresponding item. 2. The printing system according to configuration 1. (Configuration 3) The setting means is searching the static elimination setting list for an item corresponding to the type of sheet specified by the specifying means, and if the corresponding item requires static elimination processing and has no setting of a static elimination adjustment value for the static elimination processing, displaying on a display means that a static elimination adjustment value cannot be set; Sets the static electricity removal adjustment value for static electricity removal processing that is set manually by the user. 3. The printing system according to configuration 1 or 2. (Configuration 4) A measuring means for measuring humidity, The setting means searches the static elimination setting list for an item corresponding to the type of sheet specified by the specifying means and the measured humidity, and sets a static elimination adjustment value for the static elimination process of the corresponding item. 4. The printing system according to any one of configurations 1 to 3. (Configuration 5) The identifying means identifies the type of sheet based on a value detected and output by a media sensor. 5. The printing system according to any one of configurations 1 to 4. (Configuration 6) The media sensor is composed of a light emitting element and a light receiving element. 5. The printing system according to configuration 4. (Configuration 7) The types of sheets are classified according to the thickness and the smoothness of the sheet surface. 7. The printing system according to any one of configurations 1 to 6. (Method 1) A method for controlling a printing system including a printing device that performs a printing process on a sheet and a static elimination device that performs a static elimination process on the printed sheet, comprising: detecting and identifying the type of sheet fed to the printing device; a setting step of setting a static elimination adjustment value for the static elimination process based on the identified type of sheet; 13. A method for controlling a printing system comprising: (Program 1) A program for causing a computer to execute the printing system control method according to the first method. [Explanation of symbols]

[0024] 1000 Printing System 102 PC 200-3a Static eliminator 800 Media Sensor 801 Light emitting element 802 Photodetector 803 Guide part 1000L Static electricity removal setting list 1200L Static electricity removal setting list

Claims

1. A printing system including a printing device that performs a printing process on a sheet and a static elimination device that performs a static elimination process on the printed sheet, A means for identifying the type of sheet based on a signal from the sensor; a setting unit for setting a charge removal adjustment value for the charge removal process based on the identified type of sheet; A printing system comprising:

2. The setting means searches the static elimination setting list for an item corresponding to the type of sheet specified by the specifying means, and sets a static elimination adjustment value for the static elimination process of the corresponding item.

2. The printing system according to claim 1.

3. The setting means is searching the static elimination setting list for an item corresponding to the type of sheet specified by the specifying means, and if the corresponding item requires static elimination processing and has no setting of a static elimination adjustment value for the static elimination processing, displaying on a display means that a static elimination adjustment value cannot be set; Sets the static electricity removal adjustment value for static electricity removal processing that is set manually by the user.

3. The printing system according to claim 1, wherein the first and second printing units are connected to each other.

4. A measuring means for measuring humidity, The setting means searches the static elimination setting list for an item corresponding to the type of sheet specified by the specifying means and the measured humidity, and sets a static elimination adjustment value for the static elimination process of the corresponding item.

3. The printing system according to claim 2.

5. The identifying means identifies the type of sheet based on a value detected and output by a media sensor.

3. The printing system according to claim 1, wherein the first and second printing units are connected to each other.

6. The media sensor is composed of a light emitting element and a light receiving element.

6. The printing system according to claim 5.

7. The types of sheets are classified according to the thickness and the smoothness of the sheet surface.

3. The printing system according to claim 1, wherein the first and second printing units are connected to each other.

8. A method for controlling a printing system including a printing device that performs a printing process on a sheet and a static elimination device that performs a static elimination process on the printed sheet, comprising: a step of identifying the type of sheet based on a signal from the sensor; a setting step of setting a static elimination adjustment value for the static elimination process based on the identified type of sheet; 13. A method for controlling a printing system comprising:

9. A program for causing a computer to execute the printing system control method according to claim 8.

Images