JP6380191B2 - Image forming apparatus and image forming method - Google Patents

Description

  The present invention relates to an image forming apparatus and an image forming method.

  In an image forming apparatus such as a copying machine or a multifunction peripheral, it is necessary to output a printed matter on a sheet equivalent to a document sheet according to a user request. For example, in Japanese Patent Laid-Open No. 05-000746 (Patent Document 1), when a plurality of documents to be printed include documents having different properties such as thickness and paper quality, a sheet material faithful to the properties of the document is automatically added. An image forming apparatus that selects an image and forms an image thereon is disclosed. This apparatus compares the paper type of the original and the paper type set in each paper feed stage, and feeds paper from the paper feed stage in which the paper type that matches the paper type of the original is set.

JP 05-000746 A

  However, the technique described in Patent Document 1 is predicated on the fact that a paper type is registered in advance for each paper feed stage by a user's manual operation, and there is a problem that it takes time and effort for the user. In addition, if there is an error in the paper type registered by the user, a printed matter based on the registered paper type is output, and thus there may be a case where a printed matter close to the properties of the original cannot be output.

  Accordingly, the present invention has been made to solve the above-described problems, and provides an image forming apparatus and an image forming method capable of obtaining a printed matter equivalent to a document while eliminating the user's trouble. With the goal.

An image forming apparatus according to one aspect of the present invention includes an original paper type detection unit, a paper conveyance control unit, a paper type detection unit, a paper type determination unit, an image formation control unit, and a blank paper discharge control unit. Is provided. When a document is conveyed by the automatic document feeder for reading an image of a document, the document paper type detector detects a first media sensor provided in advance in the document conveyance path of the automatic document feeder. And detecting the characteristic value of the surface of the conveyed document. The paper transport control unit transports paper from a specific paper feed cassette according to the order of the cassette among the plurality of paper feed cassettes, and when the determination by the paper type determination unit for the paper does not match the original, The paper is transported from the next specific cassette according to the order of arrangement of the cassettes . The paper type detection unit detects the characteristic value of the surface of the conveyed paper using the second media sensor. The paper type determination unit determines whether the characteristic value of the surface of the paper matches the characteristic value of the surface of the document. The image formation control unit forms an image of the original on the paper when the characteristic value of the surface of the paper matches the characteristic value of the surface of the original, and when the characteristic value does not match, the paper remains blank. . The blank paper discharge control unit discharges the paper as a blank sheet to a discharge tray when the image formation control unit determines that the sheet remains blank.

  The paper type determination unit calculates an addition value obtained by adding a width value to the characteristic value of the surface of the document as an upper limit value, and calculates a subtraction value obtained by subtracting the width value from the characteristic value of the document surface as a lower limit value. Then, it is determined whether or not the characteristic value of the surface of the paper is included between the lower limit value and the upper limit value.

  The image formation control unit stops the image formation of the document when the other sheet feeding cassette does not exist.

An image forming method according to one aspect of the present invention includes an original paper type detection step, a paper conveyance control step, a paper type detection step, a paper type determination step, an image formation control step, and a blank paper discharge control step. Is provided. In the manuscript paper type detecting step, when the manuscript is conveyed by the automatic manuscript feeding unit for reading the manuscript image, a first media sensor provided in advance in the manuscript conveyance path of the automatic manuscript feeding unit is used. And detecting the characteristic value of the surface of the conveyed document. The paper transport control step transports paper from a specific paper feed cassette in accordance with the order of arrangement of the plurality of paper feed cassettes, and if the paper type determination for the paper does not match the original, A sheet is conveyed from the next specific cassette according to the arrangement order. In the paper type detection step, the characteristic value of the surface of the conveyed paper is detected using the second media sensor. The paper type determination step determines whether or not the characteristic value of the surface of the paper matches the characteristic value of the surface of the document. In the image formation control step, when the characteristic value of the surface of the paper matches the characteristic value of the surface of the original, the image of the original is formed on the paper, and when the characteristic value does not match, the paper is left blank. . In the blank paper discharge control step, when the image is left blank in the image formation control step , the blank paper is discharged to the discharge tray as blank paper.

  According to the image forming apparatus and the image forming method of the present invention, it is possible to obtain a printed material equivalent to a document while eliminating the user's trouble.

1 is a conceptual diagram illustrating an overall configuration of an image forming apparatus according to an embodiment of the present invention. 1 is a functional block diagram of an image forming apparatus in an embodiment of the present invention. It is a flowchart for showing the execution procedure of the embodiment of the present invention. FIG. 4A is a diagram illustrating an example of the same document print mode screen in the embodiment of the present invention (FIG. 4A), and FIG. 4B is a diagram illustrating an example of an automatic document feeder in the embodiment of the present invention (FIG. 4B). is there. FIG. 5A shows an example of a paper conveyance path and a paper discharge tray in the embodiment of the present invention, and an example in the case where a sheet of the same paper type as the original paper type in the embodiment of the present invention exists. It is a figure (FIG.5 (B)) which shows this. FIG. 6A is a diagram illustrating an example when a sheet of the same paper type as that of the original in the embodiment of the present invention does not exist (FIG. 6A), and FIG. 6 (B)).

  In the following, an embodiment of an image forming apparatus and an image forming method of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. In addition, the following embodiment is an example which actualized this invention, Comprising: The thing of the character which limits the technical scope of this invention is not. Moreover, the alphabet S added before the number in a flowchart means a step.

  An image processing apparatus will be described below as an example of an embodiment of the present invention. As the image processing apparatus, for example, a multifunction machine 100 (MFP: Multi Function Peripheral) having a function such as a facsimile, a copy, a scanner, and a printer, a copier, a printer, and the like can be employed.

  As illustrated in FIG. 1, the image processing apparatus 100 receives job setting conditions from the user via the operation unit 101. The job includes, for example, a job such as copying, facsimile, scanning, and printing.

  Upon receiving the job setting condition, the image processing apparatus 100 drives each unit such as the image reading unit 102, the sheet conveying unit 103, and the image forming unit 104 to execute the job. The image reading unit 102 reads an image of a document placed on the document table 102a or the automatic document feeding unit 102b. The image processing apparatus 100 includes a plurality of paper feed cassettes 105, and the paper transport unit 103 includes, for example, a paper feed cassette 105 that stores paper specified by the job setting conditions among the plurality of paper feed cassettes 105. The selected sheet is transported from the selected paper feed cassette 105 to the image forming unit 104. The image forming unit 104 transfers a toner image corresponding to the image of the document onto the conveyed paper, and fixes it with a fixing roller to form a printed matter. The image processing apparatus 100 includes a plurality of paper discharge trays 106, and the image forming unit 104 discharges the formed printed matter, for example, onto the paper discharge tray 106 specified by the job setting conditions.

  Although not shown, the control circuit of the image processing apparatus 100 is a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a HDD (Hard Disc Drive), an SSD (Solid State Drive), or a SSD (Solid State Drive). The driver corresponding to each part is connected by an internal bus.

  The CPU uses, for example, the RAM as a work area, executes a program stored in a ROM, HDD, SSD, etc., and receives data, instructions, signals, instructions, etc. from the driver based on the execution results, It controls the operation of each drive unit related to the execution of the job. Further, for each unit (shown in FIG. 2) to be described later other than the drive unit, the CPU implements each unit by executing each program. The ROM, RAM, and the like store programs and data that realize each unit described below.

  Next, the configuration and execution procedure according to the embodiment of the present invention will be described with reference to FIGS. First, when a user carries a document, goes to the image processing apparatus 100, and turns on the power of the image processing apparatus 100, the display reception unit 201 of the image processing apparatus 100 displays an operation screen on the touch panel of the operation unit 101. Display. On the operation screen, job setting conditions to be input to the image processing apparatus 100 can be input.

  Here, the operation screen is provided with a key for a specific print mode (original original print mode) for executing printing on a paper of the same paper type as the original paper type, and the user can select the specific print mode. When the key is selected, the display accepting unit 201 accepts the selection of the specific print mode key and displays the same original print mode screen corresponding to the specific print mode on the touch panel (FIG. 3: S101).

  As shown in FIG. 4A, the same original print mode screen 400 includes a message 401 indicating the same original print mode, a description 402 of the same original print mode, an original placement instruction 403, and an OK. Key 404 is displayed.

  When the user places the document on the automatic document feeding unit 102b and selects the OK key 404 while viewing the same document print mode screen 400, the display receiving unit 201 receives the selection of the OK key 404 ( (FIG. 3: S102 YES), this is notified to the document image reading unit 202. Upon receiving the notification, the document image reading unit 202 first starts conveying the document placed on the automatic document feeding unit 102b (FIG. 3: S103).

  For example, the automatic document feeder 102b includes a document placing tray 405 on which the document O is placed, a first transport roller 406 that transports the document O on the document placing tray 405, and the document O. A document conveyance path 407 for guiding the image reading unit 102 provided below. The automatic document feeder 102b includes a second transport roller 408 that transports the document O in the document transport path 407, and a document discharge tray 409 that discharges the document O on which an image has been read. ing. The document image reading unit 202 starts transporting the document O on the document placement tray 405 by rotating the first transport roller 406.

  When the document image reading unit 202 starts conveying the document, the document sheet type detection unit 203 notifies the document sheet type detection unit 203 to that effect, and the document sheet type detection unit 203 that has received the notification, as shown in FIG. Using the first media sensor 410 provided in advance in the transport path 407, the characteristic value of the surface of the transported original O is detected (FIG. 3: S104). The first media sensor 410 can detect the characteristic value of the surface of the paper, and can be, for example, a CCD. The characteristic value is a value for specifying the type (paper type) of the document or paper, and depends on the performance (CCD, etc.) and type of the first media sensor 410. , Mottle etc. can be mentioned. In the embodiment of the present invention, the characteristic value will be described as the degree of patchiness.

  For example, the manuscript paper type detection unit 203 activates the first media sensor 410 in accordance with the conveyance of the manuscript O of the manuscript image reading unit 202 and detects the degree of patchiness on the surface of the manuscript O being conveyed. . The first media sensor 410 shown in FIG. 4A is provided on the upstream side of the document conveyance path 407 from the position where the image of the document O is read, and the surface roughness of the surface of the document O is acquired.

  Further, the document image reading unit 202 continues to transport the document O, the image reading unit 102 reads the image of the document O (FIG. 3: S105), and rotates the second transport roller 408 to rotate the document. The document O is discharged to a discharge tray 409.

  When the document image reading unit 202 completes reading of the image of the document O, the document conveyance control unit 204 is notified to that effect, and the sheet conveyance control unit 204 that has received the notification identifies a specified one of the plurality of paper feed cassettes 105. Is selected (FIG. 3: S106).

  Here, as shown in FIG. 1, four paper feed cassettes 105 are provided, and four paper feed cassettes 105 are stacked from the top to the bottom. For example, when the uppermost sheet cassette 105 is the first sheet cassette and the lowermost sheet cassette 105 is the fourth sheet cassette, the sheet conveyance control unit 204 is the most recent in the same document print mode. First, the upper first sheet cassette 105 is selected.

  Then, the paper transport control unit 204 rotates a transport roller such as a pickup roller of the selected first paper feed cassette 105 via the paper transport unit 103 to transport the paper from the first paper feed cassette 105. Is started (FIG. 3: S107).

  When the sheet conveyance control unit 204 starts conveying the sheet, the sheet type detection unit 205 is notified of this, and the sheet type detection unit 205 that has received the notification conveys the sheet conveyance path as shown in FIG. Using the second media sensor 501 provided in advance in 500, the characteristic value of the surface of the conveyed paper P is detected (FIG. 3: S108). The characteristic value is the same as the characteristic value detected by the first media sensor 410, and is, for example, patchiness.

  For example, the paper type detection unit 205 activates the second media sensor 501 in accordance with the conveyance of the paper P by the paper conveyance control unit 204. The second media sensor 501 shown in FIG. 5A is a sheet P transported from a plurality of paper feed cassettes 105 on the upstream side of the sheet transport path 500 from the position where the toner image of the image forming unit 104 is transferred. Are provided in a common conveyance path 502 that passes in common. The second media sensor 501 shown in FIG. 5A is provided, for example, at a position immediately upstream of the registration roller 504 provided immediately before the photosensitive drum 503 of the image forming unit 104. The second media sensor 501 is provided on the lower side of the common transport path 502 and detects the degree of patchiness on the back surface of the transported paper P. When the paper P is transported, it is temporarily stopped by the registration roller 504, so that the paper type detection unit 205 detects the degree of unevenness on the back surface of the temporarily stopped paper P by the second media sensor 501. In determining whether or not the paper type of the document O matches the paper type of the paper P, there is no particular problem with the characteristic value of the front surface of the document O or the characteristic value of the back surface of the paper P.

  When the paper type detection unit 205 detects the degree of patchiness on the back side of the paper P, the paper type determination unit 206 notifies the fact to that effect, and the paper type determination unit 206 that has received the notification determines the degree of patchiness on the back side of the paper P. Then, it is determined whether or not the degree of patchiness on the surface of the document O coincides (FIG. 3: S109).

  For example, the paper type determination unit 206 calculates, as an upper limit value, an added value MO + D obtained by adding a width value D (−) stored in advance in a specific memory to the surface mottleness MO (−) of the document O. Then, a subtraction value MO-D obtained by subtracting the width value D (-) from the surface roughness MO (-) of the original O is calculated as a lower limit value, and the surface roughness MP (- ) Is included between the lower limit MO-D and the upper limit MO + D.

  Here, for example, when the paper type of the original O is coated paper and the paper type of the paper P of the first paper feed cassette 105 is recycled paper, the following is performed. In S109, as a result of the determination, if the speckle degree MP (−) on the back surface of the paper P is not included between the lower limit value MO−D and the upper limit value MO + D, the paper type determination unit 206 It is determined that the unevenness MP (−) on the back surface of the paper P does not match the unevenness MO (−) on the front surface of the document O (FIG. 3: S109 NO), and notifies the blank paper discharge control unit 207 to that effect. To do. Upon receiving the notification, the white paper discharge control unit 207 discharges the paper P to the paper discharge tray 106 as white paper (FIG. 3: S110).

  For example, the blank paper discharge control unit 207 stops the toner image formation on the image of the original O on the photosensitive drum 503 of the image forming unit 104, stops the fixing process of the fixing roller 505, and the paper of the registration roller 504. P is conveyed to a paper discharge conveyance path 506 on the downstream side of the fixing roller 505.

  Here, as shown in FIG. 1, six discharge trays 106 are provided, and six discharge trays 106 are arranged from the top to the bottom. The uppermost discharge tray 106 is a first discharge tray and the lowermost discharge tray 106 is a sixth discharge tray. As shown in FIG. Each of the paper discharge trays 106 is provided with a branching portion 507 for guiding the paper discharge trays 106. For example, when the white paper discharge control unit 207 discharges the white paper P to the first paper discharge tray 106, the branch path 507 of the first paper discharge tray 106 is opened and another paper discharge is performed. By closing the branch path 507 of the tray 106 and connecting the paper discharge conveyance path 506 and the first paper discharge tray 106, the blank paper P conveyed to the paper discharge conveyance path 506 is discharged to the first discharge. The paper is discharged to the paper tray 106. As a result, the paper P of a paper type different from the paper type of the original O can be discharged as a white paper without forming an image. In addition, when discharging the paper P of the first paper feed cassette 105 to the first paper discharge tray 106, the user can later transfer the white paper P to the paper feed cassette 105. When the paper is stored, the paper feed cassette 105 in which the paper P is stored can be specified from the order of the paper discharge tray 106, which improves the convenience for the user.

  Upon completion of paper discharge, the white paper discharge control unit 207 notifies the paper transfer control unit 204 to that effect, and the paper transfer control unit 204 that has received the notification notifies the paper supply cassette of the discharged white paper P It is determined whether or not there is another paper feed cassette 105 other than 105 (FIG. 3: S111).

  Here, in the above description, since the sheet conveyance control unit 204 selects the uppermost first sheet cassette 105 among the four sheet cassettes 105 and conveys the sheet P, the three other There is a paper feed cassette 105. Therefore, the sheet conveyance control unit 204 determines that there is another sheet feeding cassette 105 (FIG. 3: S111 YES), and in order from the top, the second sheet feeding cassette 105 immediately below the first sheet feeding cassette 105 is moved. Select (FIG. 3: S106). Similarly to the above, when the paper transport control unit 204 starts transporting paper from the second paper feed cassette 105 (FIG. 3: S107), the paper type detection unit 205 uses the second media sensor 501 to The degree of unevenness on the back surface of the paper P from the second paper feed cassette 105 is detected (FIG. 3: S108). Then, the paper type determination unit 206 determines whether or not the unevenness on the back surface of the paper P matches the unevenness on the surface of the document O (FIG. 3: S109).

  Here, as shown in FIG. 5B, the paper type of the document O is coated paper, and the paper type of the paper P from the second paper feed cassette 105 to the fourth paper feed cassette 105 is OHP, In the case of bond paper or coated paper, in other words, when a paper of the same paper type as that of the original O is stored in any of the plurality of paper feed cassettes 105, it is as follows. That is, since the paper type of the paper P of the second paper feed cassette 105 and the third paper feed cassette 105 is not the same as the paper type of the original O, the paper P is discharged as white paper. The paper P is sequentially conveyed from the second paper feed cassette 105 to the lowermost fourth paper feed cassette 105. Since the paper type of the paper P in the fourth paper feed cassette 105 is the same as the paper type of the original O, the paper type determination unit 206 determines that the surface characteristic value of the paper P is the original O in S109. And the image forming control unit 208 is notified of this (FIG. 3: S109 YES). Upon receiving the notification, the image formation control unit 208 forms an image of the document O on the paper P via the image formation unit 104, and executes printing (FIG. 3: S112).

  For example, the image forming control unit 208 forms a toner image for the image of the document O on the photosensitive drum 503 of the image forming unit 104, conveys the paper P of the registration roller 504, and forms the toner image on the paper P. Transfer. Further, the image formation control unit 208 executes a fixing process of the fixing roller 505 on the transferred toner image to form a printed matter.

  As described above, in the embodiment of the present invention, when printing on the paper P having the same paper type as the original O, the paper type information registered in advance for each paper feed cassette 105 is not used. The paper P having the same paper type as that of the original O is automatically searched using the characteristic value of the media sensor. Accordingly, for example, it is not necessary for the user to manually register the paper type information for each paper feed cassette 105, and the user's trouble can be eliminated. Even if the user mistakenly registers the paper type information in the paper cassette 105, it is printed on the paper P of the same paper type as that of the original O because it is based on the characteristic value of the media sensor. A printed matter can be obtained. Furthermore, it is possible to automatically obtain a printed material (copy material) close to the original O, and it is possible to reliably prevent printing on the paper P of a paper type different from the paper type of the original O.

  For example, the image forming control unit 208 uses the lowermost sixth paper discharge tray 106 as a paper discharge tray for printed matter, and when the printed matter is discharged to the sixth paper discharge tray 106, By opening the branch path 507 of the sixth discharge tray 106, closing the branch path 507 of the other discharge tray 106, and connecting the discharge transport path 506 and the sixth discharge tray 106, The printed material conveyed to the paper discharge conveyance path 506 is discharged to the sixth paper discharge tray 106. In this way, for example, the lowermost sixth discharge tray 106, which is different from the discharge tray 106 for discharging white paper, is used as a dedicated discharge tray 106 for printed matter. As a result, it is possible to clearly distinguish the types of paper to be discharged by setting the paper discharge tray 106 for discharging white paper as the uppermost level and the paper discharge tray 106 for discharging printed matter as the lowest level. And improve user convenience.

  On the other hand, as shown in FIG. 6A, the paper type of the original O is Japanese paper, and the paper types of the paper P from the first paper feed cassette 105 to the fourth paper feed cassette 105 are recycled paper, OHP. In the case of the bond paper or the coated paper, in other words, when a paper of the same paper type as that of the original O is not stored in any of the plurality of paper feed cassettes 105, the following is performed. That is, the paper P from the first paper feed cassette 105 to the fourth paper feed cassette 105 is sequentially conveyed and discharged as white paper. When the paper P in the fourth paper feed cassette 105 is discharged as white paper (FIG. 3: S110), in S111, the paper transport control unit 204 determines whether or not the other paper feed cassette 105 exists. Is determined (FIG. 3: S111).

  Here, when the paper P of the fourth paper feed cassette 105 is discharged as white paper, the other paper feed cassette 105 does not exist (FIG. 3: S111 NO), so the paper transport control unit 204 does so. Is notified to the image forming control unit 208. Receiving the notification, the image formation control unit 208 stops the job in the same document print mode (FIG. 3: S113).

  For example, the image formation control unit 208 completely stops the toner image formation on the image of the original O and the fixing process of the fixing roller 505 and notifies the display reception unit 201 to that effect. Upon receiving the notification, the display reception unit 201 displays a cancel screen 600 for canceling the job in the same document original print mode on the touch panel.

  On the cancel screen 400, as shown in FIG. 6B, a message 601 indicating cancellation, an explanation 602 indicating that there is no paper of the same paper type as the original O, and printing are canceled. A message 603 to that effect and an OK key 604 are displayed. As a result, the user can confirm that there is no paper of the same paper type as that of the original O.

  Here, for example, the user acquires blank sheets in order from the uppermost sheet discharge tray 106 toward the lower sheet discharge tray 106, and the acquired white sheets are transferred from the uppermost sheet cassette 105 to the lower sheet cassette. By storing in order toward 105, it becomes possible to correctly return the white paper to the original paper feed cassette 105.

  In the embodiment of the present invention, printing on one original document O has been described. However, even when a plurality of original documents O have mixed paper types, the characteristic value is detected for each original document O. Since the paper P having the same characteristic value as the detected characteristic value of the original O is retrieved and printed, the same effect as described above is obtained.

  In the embodiment of the present invention, the second media sensor 501 provided in advance in the paper conveyance path 502 is used to detect the characteristic value of the back surface of the paper P. However, other configurations may be used. For example, the second media sensor 501 may be provided on the upper side of the common transport path 502 so as to detect the characteristic value of the surface of the transported paper P. Alternatively, a second media sensor 501 may be provided for each paper feed cassette 105 to detect the characteristic value of the paper P conveyed from the paper feed cassette 105.

  In the embodiment of the present invention, printing is performed on the paper P having a characteristic value that matches the characteristic value of the document O. However, other configurations may be used. For example, the paper type determination unit 206 determines whether or not the characteristic value of the surface of the paper matches the characteristic value of the surface of the original and whether or not the size of the paper matches the size of the original. Determine. When the characteristic value of the paper matches the characteristic value of the original and the size of the paper matches the size of the original, the image formation control unit 208 displays the image of the original on the paper. Form. On the other hand, the blank sheet discharge control unit 207 discharges the sheet as a blank sheet when the characteristic value of the sheet does not match the characteristic value of the document or when the size of the sheet does not match the size of the document. Paper is ejected to the paper tray. Alternatively, the paper transport control unit 204 may be configured to transport paper from a specific paper feed cassette that stores paper of the same size as the original size among the plurality of paper feed cassettes.

  In the embodiment of the present invention, the image forming apparatus 100 is configured to include each unit. However, a program that realizes each unit may be stored in a storage medium and the storage medium may be provided. In this configuration, the program is read by the apparatus, and the apparatus realizes the units. In that case, the program itself read from the recording medium exhibits the effects of the present invention. Furthermore, it is possible to provide a method for storing the steps executed by each means in a hard disk.

  As described above, the image forming apparatus and the image forming method according to the present invention are useful for an image forming apparatus such as a printer, a copier, and a multifunction peripheral, and obtain a printed matter equivalent to an original while eliminating the user's trouble. This is effective as an image forming apparatus and an image forming method that can be used.

DESCRIPTION OF SYMBOLS 100 Image forming apparatus 105 Paper feed cassette 106 Paper discharge tray 201 Display reception part 202 Original image reading part 203 Original paper type detection part 204 Paper conveyance control part 205 Paper type detection part 206 Paper type determination part 207 Blank paper discharge control part 208 Image Formation control unit

Claims (4)

When a document is conveyed by an automatic document feeder for reading an image of the document, the document is conveyed using a first media sensor provided in advance in a document conveyance path of the automatic document feeder. A manuscript paper type detection unit for detecting the characteristic value of the surface of the manuscript;
When a sheet is transported from a specific sheet feeding cassette according to the order of arrangement of the plurality of sheet feeding cassettes and the determination by the sheet type determination unit for the sheet does not match the original, the order of the cassette is followed. A paper transport control unit for transporting paper from the next specific cassette;
A paper type detection unit for detecting a characteristic value of the surface of the conveyed paper using a second media sensor;
The paper type determination unit for determining whether the characteristic value of the surface of the paper matches the characteristic value of the surface of the document;
An image formation control unit that forms an image of the original on the paper when the characteristic value of the surface of the paper matches the characteristic value of the surface of the original;
A blank paper discharge control unit that discharges the paper as a blank sheet to a discharge tray when the image formation control unit leaves the sheet blank;
An image forming apparatus comprising: The paper type determination unit calculates, as an upper limit value, an addition value obtained by adding a width value to the speckled degree that is a characteristic value of the surface of the original, and subtracts the width value from the specularity that is a characteristic value of the surface of the original. The image forming apparatus according to claim 1, wherein the subtraction value is calculated as a lower limit value, and it is determined whether or not the characteristic value of the surface of the sheet is included between the lower limit value and the upper limit value. The image formation control unit stops forming an image of the original when the sheet is discharged as a blank sheet to a discharge tray and there is no cassette other than the sheet cassette for the discharged blank sheet. Item 2. The image forming apparatus according to Item 1. When a document is conveyed by an automatic document feeder for reading an image of the document, the document is conveyed using a first media sensor provided in advance in a document conveyance path of the automatic document feeder. A manuscript paper type detecting step for detecting the characteristic value of the surface of the manuscript;
If a sheet is transported from a specific sheet cassette among a plurality of sheet cassettes and the paper type determination for the sheet does not match the original, the next sheet according to the order of the cassette is A paper transport control step for transporting paper from a particular cassette,
Using a second media sensor, a paper type detection step for detecting a characteristic value of the surface of the conveyed paper;
The paper type determination step for determining whether or not the characteristic value of the surface of the paper matches the characteristic value of the surface of the document;
An image forming control step of forming an image of the original on the paper if the characteristic value of the surface of the paper matches the characteristic value of the surface of the original, and leaving the paper blank if not matched;
If the paper is left blank in the image formation control step , a blank paper discharge control step for discharging the paper as a blank sheet to a discharge tray;
An image forming method comprising:

Images