Image forming apparatus and adjustment mark

Abstract

This invention provides an image forming apparatus and adjustment marks that allow the post-processing position to be easily aligned with the position of a reference line by manual measurement. [Solution] The image forming apparatus 1 comprises a printing unit 2 that forms a printed image on a recording medium P, and a post-processing unit 3 that performs post-processing on the recording medium P on which the printing unit 2 has formed a printed image. The image forming apparatus 1 also comprises an adjustment chart generation unit 5 that generates a composite image having adjustment marks for measuring the amount of deviation from the post-processing position as an adjustment chart. The image forming apparatus 1 also comprises a post-processing setting unit 6 that adjusts the processing position of the post-processing performed by the post-processing unit 3 using the measured amount of deviation.

Description

[Technical Field]

[0001] The present invention relates to an image forming apparatus and an adjustment mark. [Background Art]

[0002] Conventionally, as an image forming apparatus, one that processes multi-up printed matters such as business cards and coupons is known (see, for example, Patent Document 1). In such an apparatus, after a plurality of print images are printed, post-processing such as cutting is performed by an inline (printing process) trimmer unit (hereinafter also referred to as TU). In addition, the printed matter is provided with a reference line serving as a reference position for cutting between each graphic and an auxiliary line parallel to the reference line. Accordingly, even when the cutting surface overlaps the reference line and disappears, positional deviation (deviation amount, deviation direction, etc.) can be detected from the position of the auxiliary line.

[0003] As described above, the conventional image forming apparatus enables highly accurate adjustment of the post-processing position even when there are influences such as machine differences for each TU or specification changes of post-processed printed matters by using the reference line and the auxiliary line drawn on the recording medium. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent No. 7517185 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] In the conventional apparatus configured as described above, when the cut position occurs outside the reference line, it is necessary to actually measure the length from the cut surface to the reference line. In addition, when the cut position occurs inside the reference line, it is necessary to actually measure the length from the cut surface to the auxiliary line and perform a calculation of subtracting the length from the distance between the reference line and the auxiliary line.

[0006] Furthermore, there are known systems that use scanners installed in the post-cutting process to automatically detect misalignment. For example, a single recording medium may be cut into multiple cards (such as business cards). In such cases, depending on the pitch spacing of the transport rollers, it may not be possible to transport the small pieces of printed material to the scanner position. Therefore, automatic detection of misalignment was not possible, and further improvements were needed.

[0007] This invention was made in view of the above background, and aims to provide an image forming apparatus and adjustment marks that allow the position of post-processing to be easily aligned with the position of a reference line by manual measurement. [Means for solving the problem]

[0008] The above problems of the present invention are solved by the following configuration. That is, the image forming apparatus is (1) The image forming apparatus comprises a printing unit that forms a printed image on a recording medium, and a post-processing unit that performs post-processing on the recording medium on which the printing unit has formed the printed image. The image forming apparatus comprises an adjustment chart generation unit that generates a composite image having adjustment marks for measuring the amount of deviation from the post-processing position as an adjustment chart. The image forming apparatus comprises a post-processing setting unit that adjusts the processing position of the post-processing performed by the post-processing unit using the measured amount of deviation.

[0009] (2) The adjustment chart generation unit is an image forming apparatus according to (1) that further synthesizes a reference line indicating the position of the post-processing to the composite image. (3) The image forming apparatus described in (1) can calculate the amount of deviation from the dimensions of the processing surface formed on the recording medium by post-processing. (4) The adjustment chart generation unit is an image forming apparatus as described in (3), which combines the composite image with a calculation method for calculating the amount of displacement from the length of the processing surface.

[0010] (5)(2) The adjustment mark used in the image forming apparatus described above has an arbitrary deviation amount reference point on the reference line and an intersection point where a perpendicular line from the deviation amount reference point intersects a parallel line parallel to the reference line. The adjustment mark has a ratio setting point where the extension of the hypotenuse intersects the parallel line, which increases the distance on the parallel line from the intersection point by a predetermined ratio according to the distance on the perpendicular line from the deviation amount reference point. As a result, the adjustment mark has a triangular shape. Furthermore,

[0011] (6) The ratio setting point is the adjustment mark described in (5), having a first ratio setting point and a second ratio setting point, which are spaced apart in opposite directions from the intersection point. (7) The adjustment mark has a positive region and a negative region opposite each other across the reference line, and the color and / or intensity of the positive region and the negative region are different, and is used in the image forming apparatus described in (2). [Effects of the Invention]

[0012] According to the present invention, an image forming apparatus and adjustment marks are provided that allow the position of post-processing to be easily aligned with the position of a reference line by manual measurement. [Brief explanation of the drawing]

[0013] [Figure 1] This is a side view showing the overall configuration of the image forming apparatus according to the embodiment. [Figure 2] This is a block diagram illustrating the internal configuration of an image forming apparatus. [Figure 3] This is a plan view showing an example of a printed image printed on a recording medium. [Figure 4] This is a plan view showing an example of adjustment marks printed on a recording medium. [Figure 5] This is a plan view of the adjustment marks used to calculate the amount of deviation in the cutting position. [Modes for carrying out the invention]

[0014] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the present specification and the accompanying drawings, components having substantially the same functions are denoted by the same reference numerals, and redundant description thereof will be omitted. For the convenience of description, a direction along a horizontal plane perpendicular to the paper conveyance direction F is referred to as the width direction W herein. Furthermore, in FIG. 1, the description of the recording medium P being printed is omitted, and only the conveyance direction F of the recording medium P conveyed in the image forming apparatus 1 is indicated by an arrow.

[0015] Modes for carrying out the present invention will be described in detail below with reference to the respective drawings. FIG. 1 shows the image forming apparatus 1 according to the present embodiment. The image forming apparatus 1 includes a printing unit 2 that forms a printed image on a recording medium P to produce a printed matter. The printing unit 2 is connected to a paper feeding unit 4 that holds a plurality of recording media (also referred to as media) P on the upstream side in the conveyance direction F, each of which is held in a paper feeding tray. Then, the printing unit 2 prints a printed image on the recording medium P conveyed from the paper feeding unit 4 by an intermediate transfer method using an electrophotographic process technology.

[0016] That is, the printing unit 2 primarily transfers toner images of respective colors of Y (yellow), M (magenta), C (cyan), and K (black) formed on a photoconductive drum (not shown) onto an incorporated intermediate transfer belt. Then, an image formed by superimposing the four-color toner images is secondarily transferred onto at least one of the front surface and the back surface of the recording medium P conveyed from the paper feeding tray, whereby a printed image is formed.

[0017] Furthermore, the image forming apparatus 1 includes a post-processing unit 3 on the downstream side of the printing unit 2 in the conveyance direction F. The post-processing unit 3 is configured to perform post-processing steps such as cutting on the recording medium P on which a printed image has been formed by the printing unit 2. Furthermore, the post-processing unit 3 may include a paper discharge unit or the like having a plurality of paper discharge trays in the conveyance direction F of the image forming apparatus 1. Then, the recording medium P post-processed by cutting or the like is carried out from the post-processing unit 3 in the form of a booklet or the like.

[0018] Further, in the image forming apparatus 1 according to the embodiment, an operation panel 7 for inputting a displacement amount measured by manual measurement and an image reading unit for reading an image from a duplication target such as a document are provided on an upper portion of a housing that accommodates a printing unit 2.

[0019] Among these components, the operation panel 7 is configured such that a user can input a manually measured displacement amount to adjust the processing position of post-processing performed by the post-processing unit 3. The operation panel 7 of the embodiment includes a display unit 8 such as an LCD (Liquid Crystal Display) or an organic EL (Electro-luminescence) display. Further, the operation panel 7 includes an operation unit 9 including various operation keys or the like that can input instructions from a user as numerical values or position information. In addition, a part of the operation unit 9 may be integrally provided as a touch panel on the display unit 8. The operation panel 7 sends input information input via the operation unit 9 as an input signal to a control unit described later.

[0020] Further, the operation panel 7 displays a setting screen for various operations on the display unit 8 based on a display signal sent from the control unit. The setting screen can display information assisting input, such as a guide for setting a post-processing position, for example. Note that other input devices such as a mouse and a tablet may be used as the operation unit 9, or may be used in combination therewith.

[0021] Further, a control unit provided in the image forming apparatus 1 is connected to the operation panel 7, and is also connected to the printing unit 2, the post-processing unit 3, and the paper feed unit 4. The control unit comprises a CPU (Central Processing Unit) and ROM (Read Only Memory). Furthermore, the control unit includes a storage device such as RAM (Random Access Memory) or HDD (Hard Disk Drive). The CPU reads a program corresponding to the processing content from the ROM or storage device and loads it into the RAM. Note that the storage device is not limited to an HDD. For example, the storage device may consist of recording media such as an SSD (Solid State Drive) or DVD (Digital Versatile Disc)-ROM.

[0022] The CPU then works in cooperation with the deployed program and various data stored in storage units such as storage to control the printing unit 2, post-processing unit 3, and paper feeding unit 4, which constitute the respective parts of the image forming apparatus 1. For example, the user looks at the post-processing position setting screen displayed on the display unit 8 of the control panel 7 and presses the adjustment sheet output button on the control unit 9. As a result, the CPU of the control unit controls the printing unit 2 to print an adjustment chart 10 for adjusting the post-processing position onto the recording medium P sent from the paper feed unit 4.

[0023] Furthermore, the CPU of the control unit is configured to control the post-processing unit 3 to perform specified post-processing, such as cutting, on the recording medium P transported from the printing unit 2. The image forming apparatus 1 of this embodiment includes an adjustment chart generation unit 5 that generates a composite image as an adjustment chart, and a post-processing setting unit 6 that adjusts the processing position of the post-processing performed by the post-processing unit 3 using the measured amount of deviation.

[0024] As schematically shown in Figure 2, in the control by the control unit, when adjusting the post-processing position using an adjustment chart, the adjustment chart generation unit 5 that generates a composite image and the operation panel 7 provided on the post-processing setting unit 6 are mainly used. Of these, the adjustment chart generation unit 5 generates a composite image as an adjustment chart 10.

[0025] The adjustment chart generation unit 5 sends print image data of the adjustment chart, which includes multiple adjustment marks 11, to the printing unit 2. The printing unit 2 can then print the adjustment chart 10 (see Figure 3) onto the recording medium P.

[0026] As shown in Figure 3, the adjustment chart 10 includes a linear reference line 12 indicating the position of the post-processing step, and multiple adjustment marks 11 for measuring the amount of deviation from the post-processing step. Of these, the reference line 12 indicates the cutting line used to cut and separate multi-page printed materials such as business cards and coupons from the recording medium P.

[0027] In this embodiment, we will explain the case where "four-sided trimming" is performed, as shown in Figure 3. "Four-sided trimming" is one method of trimming a recording medium P, and the trimming position information is stored in advance in a storage device or the like. "Four-sided trimming" trims the four edges of the recording medium P in the transport direction F and the width direction W perpendicular to the transport direction. In further embodiments, slit trimming may be performed simultaneously in the transport direction F and the width direction W of the recording medium P. As a result, the size of the recording medium P (printed material) after trimming will be the desired size. For example, the size of the recording medium P (printed material) after trimming may be the size of a business card, and it may be separated into four small pieces.

[0028] However, on the recording medium P after the cutting process, the cutting lines overlap with the reference lines, making it highly likely that the reference lines disappear. For this reason, conventional methods for measuring the amount of misalignment include printing multiple auxiliary lines parallel to the reference line. For example, on the adjustment sheet S after cutting, there may be cases where one of the two auxiliary lines, the one on the reference position side, disappears while the other auxiliary line remains. In this case, it can be said that a positional misalignment has occurred with a misalignment amount greater than or equal to the distance between the reference position and one of the auxiliary lines on the reference position side, and less than the distance between the reference position and the other auxiliary line.

[0029] In conventional measurement methods, if the cutting position occurs outside the reference line, it is necessary to measure the length from the cut surface to the reference line. Furthermore, if the cutting surface occurs inside the reference line, it is necessary to measure the length from the cutting surface to the auxiliary line and subtract this from the distance between the reference line and the auxiliary line.

[0030] Therefore, it was necessary to actually measure the length from the cutting surface to the reference line, or from the cutting surface to the auxiliary line, and then decide whether to calculate the position adjustment value, which made the adjustment process complicated. In contrast, in the image forming apparatus 1 of this embodiment, an adjustment chart 10 having adjustment marks 11 as shown in Figure 3 is printed on the recording medium P. The adjustment chart 10 is a composite image in which a reference line 12 indicating the position where post-processing is performed and adjustment marks 11 for measuring the amount of deviation from the position where post-processing is performed are combined.

[0031] The adjustment chart 10 is pre-stored in the storage device as print data for each size of the recording medium P and the printed material. In the measurement method for the adjustment value of this embodiment, first, as a post-processing step by the post-processing unit 3, the recording medium P on which the adjustment chart 10 is printed is cut. Then, the user can easily calculate the amount of deviation from the width dimension X of the portion of the processed surface 40 (see Figure 5) that is cut in the post-processing step that overlaps with the adjustment mark 11.

[0032] The adjustment mark 11 of this embodiment is mainly composed of a positive region 13 printed outside the reference line 12 of the printed material, and a negative region 14 printed inside the reference line 12 of the printed material, facing the positive region 13 across the reference line 12. The positive region 13 and the negative region 14 each have the shape of an isosceles triangle. The positive region 13 and the negative region 14 are printed so as to be symmetrical in the transport direction F, with an arbitrary deviation amount reference point 15, which is located on the reference line 12, as their common vertex.

[0033] Furthermore, the positive region 13 and the negative region 14 of the embodiment have a positive side intersection point 20 and a negative side intersection point 21, respectively, which are formed by intersecting the positive side parallel line 16 and the negative side parallel line 17, which are parallel to the reference line 12, with perpendicular lines 18 and 19 from the deviation amount reference point 15.

[0034] In this embodiment, the dimension of the perpendicular line 18 from the displacement reference point 15 to the positive intersection point 20 and the dimension of the perpendicular line 19 from the displacement reference point 15 to the negative intersection point 21 are configured to be the same length. Furthermore, the positive region 13 and the negative region 14 each have a ratio setting point on the positive side and a ratio setting point on the negative side, respectively.

[0035] The positive ratio setting points of the embodiment include a first positive ratio setting point 24 and a second positive ratio setting point 25, which are spaced apart in opposite directions from the intersection point 20 in the direction of extension of the parallel line 16. Furthermore, the negative ratio setting points of the embodiment include a positive first ratio setting point 26 and a second ratio setting point 27, which are spaced apart in opposite directions from the intersection point 21 in the direction of extension of the parallel line 17.

[0036] Furthermore, the triangular shapes forming the positive region 13 and the negative region 14 have hypotenuses 28, 29 and 30, 31, respectively. The triangular shapes also constitute the ratio setting points where the extensions of the hypotenuses 28, 29 and 30, 31 intersect the parallel lines 16 and 17. In this embodiment, the first ratio setting point 24 and the second ratio setting point 25 on the positive side increase the distance between the intersection point 20 and the opposite direction on the respective parallel lines 16 by a predetermined ratio, according to the distance between them on the perpendicular line 18 from the deviation reference point 15. Furthermore, the first ratio setting point 26 and the second ratio setting point 27 on the negative side increase the distance between them in opposite directions on the respective parallel lines 17 from the intersection point 21 by a predetermined ratio, according to the distance between them on the perpendicular line 19 from the deviation reference point 15.

[0037] In this embodiment, the adjustment mark 11 is set such that the ratio of the lengths of the sides of the triangle enclosed by the deviation reference point 15, the intersection point 20, and the first ratio setting point 24 within the positive region 13 shown in Figure 4 is a:b:c = 1:√5:2. Furthermore, within the positive region 13, the second ratio setting point 25 of the embodiment is spaced the same distance from the intersection point 20 in the width direction W, in the opposite direction to the first ratio setting point 24.

[0038] Furthermore, within the negative region 14 shown in Figure 4, the ratio of the lengths of the sides of the triangle enclosed by the displacement reference point 15, the intersection point 21, and the first ratio setting point 26 is set to 1:√5:2. Note that the ratio of the sides of the triangle is not limited to this ratio. Furthermore, within the negative region 14, the second ratio setting point 27 of the embodiment is spaced the same distance from the intersection point 21 in the width direction W, in the opposite direction to the first ratio setting point 26.

[0039] Furthermore, as shown in Figure 4, the positive area 13 and the negative area 14 of the adjustment mark 11 are differentiated in color and / or shade. For example, the positive area 13 is colored blue, while the negative area 14 is colored red.

[0040] Furthermore, the adjustment chart generation unit 5 of the embodiment generates an adjustment chart 10 by combining a calculation method 50 that calculates the amount of deviation from the length of the processing surface 40 with the composite image. The user can easily understand the adjustment value by looking at the calculation method 50 printed on the recording medium P. In this embodiment, the recording medium P is printed with the calculation method 50, which is "Cutting deviation amount = Cutting surface length ÷ 4". However, the method is not limited to this, and the adjustment chart 10 may be generated to combine and print calculation methods 50 that are adapted to the ratio of each side of a pre-set triangular shape according to the recording medium P and the type of printed material.

[0041] Therefore, the user can recognize the adjustment value by visually inspecting the processing surface 40. Furthermore, the adjustment value can be manually entered from the operation unit 9 provided on the operation panel 7, eliminating the need for automatic measurement. Therefore, unlike conventional methods, a scanner is not required in the post-cutting process, and it can be applied to printed materials that have been cut into multiple cards (such as business cards).

[0042] In the image forming apparatus 1 configured in this way, when the adjustment sheet output button on the operation unit 9 is pressed down, the control unit controls the printing unit 2 to print the adjustment chart 10 on the recording medium P. In the embodiment, the adjustment chart 10 is generated by combining a reference line 12 and adjustment marks 11 having a positive region 13 and a negative region 14 at symmetrical positions on the opposite side of the reference line 12.

[0043] For example, when the post-processing unit 3 cuts the recording medium P on which the adjustment chart 10 is printed, the processing surface 40 may be separated from the reference line 12 by a predetermined amount Y in the forward or backward direction F of the transport direction.

[0044] Figure 5 illustrates a case where the processing surface 40 is cut with a displacement Y behind the reference line 12 in the transport direction F. The same applies when the processing surface 40 is cut with a displacement forward in the transport direction F. Therefore, this explanation focuses on the case where the processing surface 40 is located within the negative region 14, and omits the explanation for the case where the processing surface 40 is formed within the positive region 13.

[0045] The adjustment mark 11 of this embodiment can calculate the amount of deviation Y from the width dimension X of the processing surface 40 formed on the recording medium P in the post-processing cutting step. For more details, the user visually measures the width dimension X of the width direction W that falls within the negative region 14 of the processed surface 40 that has been cut during post-processing, using a measuring tool such as a ruler.

[0046] In this case, the end face of the recording medium P, such as paper, becomes the processing surface 40. Therefore, compared to the conventional method of measuring the length from the cutting surface to the reference line in a direction almost perpendicular to the processing surface, it is only necessary to measure the width dimension X of the processing surface 40 in a stable state along the end face, thereby improving measurement accuracy.

[0047] In this embodiment, if the processing surface 40 is located in the blue-colored portion of the adjustment mark 11, it can be determined that the cutting position is shifted forward of the reference line 12. Conversely, if the processing surface 40 is located in the red-colored portion, it can be easily determined that the cutting position is shifted backward of the reference line 12. Furthermore, even for printed materials such as business cards, which are too small to be transported after cutting and therefore cannot be automatically measured, it is possible to easily determine the direction of the shift and take an actual measurement.

[0048] Then, the user, while looking at the calculation method 50 printed on the recording medium P, inputs an adjustment value that is 1 / 4 of the measured width dimension X in the width direction W, and the adjustment direction (front or back) via the operation unit 9 provided on the operation panel 7. Therefore, the accuracy of the adjustment value calculated from the measured value is four times higher.

[0049] In the post-processing setting unit 6, adjustment value data obtained by manual measurement is input from the operation panel 7 by the user. The control unit of the image forming apparatus 1 adjusts the cutting position performed in the post-processing unit 3 using the input adjustment values. As a result, the image forming apparatus 1 and adjustment mark 11 of the embodiment can easily align the position of the processing surface 40, which is to be cut by post-processing, with the position of the reference line 12 by manual measurement.

[0050] In this embodiment, Figure 5 illustrates a case where the processing surface 40 is cut with a displacement Y behind the reference line 12 in the transport direction F, but the embodiment is not limited to this. For example, even when the processing surface 40 is shifted forward in the transport direction F during cutting, the length of the processing surface 40 located within the positive region 13 is measured. Then, by inputting the adjustment value from the operation unit 9 on the operation panel 7, the position of the processing surface 40 after post-processing can be aligned with the position of the reference line 12. Other configurations and effects are the same as in the case where the processing surface 40 is shifted backward and located within the negative region 14, as shown in Figure 5.

[0051] Although one embodiment of the present invention has been described above, the embodiments are merely illustrative and do not limit the technical scope of the present invention. The present invention can take various other embodiments, and furthermore, various modifications such as omissions and substitutions can be made without departing from the spirit of the present invention. These embodiments and their variations are included in the scope and spirit of the invention as described herein, and are included in the scope of the invention and its equivalents as described in the claims.

[0052] For example, the adjustment mark 11 used in the image forming apparatus 1 of the embodiment has a positive area 13 and a negative area 14 with different colors. However, the adjustment mark 11 is not limited to this. For example, the positive area 13 and the negative area 14 may have different print density. That is, it is sufficient that the positive area 13 and the negative area 14 have different colors and / or density. Furthermore, the size of the positive area 13 and the negative area 14, the ratio of each side, and the placement location are not particularly limited.

[0053] For example, the triangle may be a right-angled isosceles triangle with side ratios a:b:c of 1:1:√2. In this case, the calculation method for the adjustment value is Y=X / 2. Alternatively, the adjustment mark 11 may be a triangle enclosed by the deviation amount reference point 15, the intersection point 21, and the first ratio setting point 26 in the negative region 14. Or, it may be a triangle enclosed by the deviation amount reference point 15, the intersection point 21, and the second ratio setting point 27, or either one alone may be used. In this case, the calculation method for the adjustment value is Y=X / 2.

[0054] Furthermore, if the deviation from the reference line 12 occurs only on one side in the forward and backward direction of the reference line 12, the adjustment mark 11 only needs to have either the corresponding positive region 13 or the negative region 14. Furthermore, in the embodiment, we have described a case in which the post-processing of the recording medium P is performed by the post-processing unit 3 as a post-processing step performed by the image forming apparatus 1. However, post-processing is not limited to cutting. For example, the system may be configured to perform perforation or folding as a post-processing step. In other words, post-processing can be performed on the recording medium P on which the printing unit 2 has formed a printed image.

[0055] In this invention, the post-processing setting unit 6 adjusts the desired position of perforation or folding using the amount of deviation measured manually. Manual measurement is performed by using a composite image with adjustment marks 11 as an adjustment chart 10, allowing for quick and accurate determination of the deviation from the reference line 12. Therefore, the position of post-processing can be easily aligned with the reference line, not only for cutting but also for perforation and folding. Thus, this invention can exhibit practically beneficial effects, such as further improving the quality of printed materials. [Explanation of Symbols]

[0056] 1. Image forming apparatus 2 Printing Department 3. Post-processing 4. Paper feed unit 5. Adjustment Chart Generation Unit 6. Post-processing setting unit 7. Control Panel 8 Display 9 Control section 10 Adjustment Chart 11 Adjustment Mark 12. Reference Line

Claims

1. A printing unit that forms a printed image on a recording medium, A post-processing unit which performs post-processing on the recording medium on which the printing unit has formed a printed image, An adjustment chart generation unit generates an adjustment chart of a composite image having adjustment marks for measuring the amount of deviation from the position of the post-processing, A post-processing setting unit adjusts the processing position of the post-processing unit to be performed by the post-processing unit using the measured amount of deviation, An image forming apparatus equipped with the following features.

2. The adjustment chart generation unit further synthesizes a reference line indicating the position of the post-processing on the composite image. The image forming apparatus according to claim 1.

3. The image forming apparatus according to claim 1, wherein the amount of deviation can be calculated from the dimensions of the processed surface formed on the recording medium by post-processing.

4. The adjustment chart generation unit combines the composite image with a calculation method for calculating the amount of displacement from the length of the processing surface. The image forming apparatus according to claim 3.

5. An adjustment mark used in an image forming apparatus according to claim 2, having a triangular shape, comprising: an arbitrary deviation amount reference point on the reference line; an intersection point obtained by drawing a perpendicular line from the deviation amount reference point to a parallel line parallel to the reference line; and a ratio setting point where the extension of the hypotenuse that increases the distance on the parallel line from the intersection point by a predetermined ratio according to the distance on the perpendicular line from the deviation amount reference point intersects the parallel line.

6. The adjustment mark according to claim 5, wherein the ratio setting points include a first ratio setting point and a second ratio setting point, which are spaced apart in opposite directions from the intersection point.

7. The adjustment mark used in the image forming apparatus according to claim 2, wherein the adjustment mark has a positive region and a negative region opposite each other across the reference line, and the color and / or intensity of the positive region and the negative region are different.

Images