JP2009292111A - System and method for detecting position of holding tray and recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately obtain a center position of a set part of a holding tray. <P>SOLUTION: The system for detecting the position of the holding tray includes: a circular mark for detection 80 which is provided on one surface of the holding tray 55 having the set part 71 for setting material to be set Q; a mark position detection sensor 85 scanning the mark for detection 80 along first and second scanning lines crossing with each other on the one surface, and detecting a position of an intersection of the outer periphery of the mark for detection 80 with the scanning lines; and a set part center obtaining part 93 obtaining the center position of the set part 71 based on the mark center position of the mark for detection 80 obtained based on the detected position of the intersection. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a holding tray position detection system for detecting a center position of the set portion of a holding tray on which a set material such as a recording material is set, a method for detecting the setting portion center of the holding tray, and a recording apparatus. .

Hereinafter, an ink jet printer which is an example of a recording apparatus will be described as an example. Inkjet printers include both soft recording materials that are not self-supporting, such as paper and film, and hard recording materials that are self-supporting, as represented by optical disks (CD-R, DVD-R, etc.). However, there is a printer having a structure capable of selectively executing recording. When recording is performed on the CD-R or the like, a dedicated holding tray prepared as a separate accessory is used, or the holding tray in the printer main body described in Patent Document 1 below is used. An ink jet printer with a built-in structure is used.
The holding tray is provided with a shallow set portion for setting an optical disc (recording material) such as a CD-R on the upper surface thereof, and the optical disc (recording material) is set against the shallow set portion of the holding tray. ) Is set and transported.

  In the inkjet printer, in order to perform recording at an accurate position with respect to the label surface of the optical disc (recording material), the center position of the set portion of the optical disc (recording material) is detected. Recording is performed by developing the recording data based on the center position.

Patent Document 2 below discloses a detection method for detecting the outer peripheral position of an optical disk itself set on a holding tray and obtaining the center position of the optical disk based on the detected value. In addition, a square hole for position detection serving as a reference for detecting the center position of the set unit is provided in the holding tray, a center position of a quadrangle formed by the square hole is obtained, and the set unit is obtained from the obtained center position. A detection method of obtaining the center position of the image has also been implemented.
JP 2005-59584 A JP 2003-217259 A

  However, in the case of the method of detecting the outer peripheral position of the optical disc (recording material) itself, there are variations in the size of the label surface of the optical disc and the outer peripheral diameter of the optical disc from manufacturer to manufacturer, and the outer periphery of the optical disc. Since the reflection member on the surface where the pits are formed is visible in the portion, it is difficult to accurately detect the label surface of the optical disc and the outer peripheral edge of the optical disc using the reflective sensor.

  On the other hand, in the case of the method using the square hole provided in the holding tray, the above-mentioned problem does not occur, but when the skew (tilt) is generated in the holding tray, as shown in FIG. Since the detection center 101 of the square mark, which is the square hole 100, deviates from the original center 102 of the square hole 100, the center position of the set portion cannot be obtained accurately.

  An object of the present invention is to provide a holding tray position detection system, a detection method, and a recording apparatus that can accurately determine the center position of the setting portion of the holding tray.

  To achieve the above object, a holding tray position detection system according to a first aspect of the present invention is a circular detection mark provided on one surface of a holding tray having a set portion for setting a material to be set. And mark position detection in which the detection mark is scanned along the first and second scanning lines intersecting each other within the one surface, and the position of the intersection between the outer periphery of the detection mark and the scanning line is detected. A sensor and a set part center determining unit for determining a center position of the set part based on a mark center position of the detection mark determined based on the detected position of the intersection.

  According to this aspect, since the detection mark is formed in a circular shape, the center position of the detection mark is the same as that of the conventional square detection mark even in a situation where the skew is generated in the holding tray. Can be obtained without any influence of the skew. Thereby, the center position of the set portion can be obtained with high accuracy.

  According to a second aspect of the present invention, in the holding tray position detection system according to the first aspect, the holding tray includes a chuck portion that chucks a central portion of the set material to be set. One detection mark is provided at the center of the chuck portion.

  According to this aspect, since one detection mark is provided at the center of the chuck portion, the obtained mark center position becomes the center position of the set portion as it is. Therefore, the center position of the set portion can be obtained with a simple structure and without performing arithmetic processing. Furthermore, the center position of the set portion can be obtained with high accuracy without any influence of the skew.

  According to a third aspect of the present invention, in the holding tray position detection system according to the first aspect, the number of the detection marks is two, and the set portion center determination portion includes the two determined mark center positions. The center position of the set portion is obtained based on the above.

  According to this aspect, by specifying in advance the relative positional relationship between the center positions of the two detection marks and the center position of the set portion, the center position of the set portion can be determined without being affected by the skew. It can be obtained with high accuracy. That is, when skew has occurred, it can be understood that skew has occurred in the holding tray by obtaining the center positions of the two detection marks. Since the amount of skew can be obtained by simple arithmetic processing, the center position of the set portion can be accurately obtained without being affected by the skew.

  According to a fourth aspect of the present invention, in the holding tray position detection system according to the third aspect, the two detection marks are on a straight line passing through the center of the set portion, and the center of the set portion. It is equidistant from, and it is provided in the outer position of the said set part.

  According to this aspect, if the center positions of the two detection marks are known, the center of the set portion is located at the midpoint between them, so that the calculation process can be simplified.

  According to a fifth aspect of the present invention, in the holding tray position detection system according to the first aspect, at least three of the detection marks are arranged on a concentric circle at the center of the set portion. The part center obtaining unit obtains the center position of the set part, which is the center position of the concentric circles, based on the obtained at least three mark center positions.

  According to this aspect, since at least three detection marks are arranged on the concentric circles at the center of the set portion, the center positions of the concentric circles are determined based on the obtained at least three mark center positions. The center position of a certain set portion can be easily obtained, whereby the center position of the set portion can be accurately obtained without any influence of skew. Further, similarly to the third aspect and the fourth aspect, the skew amount of the holding tray can be obtained at the same time.

  According to a sixth aspect of the present invention, there is provided a method for detecting a center of a set portion of a holding tray, wherein the holding tray provided with a circular detection mark is moved in the transport direction, and the detection mark is moved by a mark position detection sensor. A first detection step in which the mark position detection sensor is positioned on a movement line and the mark position detection sensor is moved on the movement line to detect two intersections in the movement direction with the outer periphery of the detection mark; and the mark position detection sensor Are moved on the detection mark moving line when the holding tray is conveyed, the holding tray is moved in the conveyance direction, and two intersection points in the conveyance direction with the outer periphery of the detection mark A mark center of the detection mark is obtained from two intersection points in the movement direction and two intersection points in the transport direction, and based on the obtained mark center. It is characterized in that and a step determined setting section center obtain the center of the set portion of the set material are.

  According to this aspect, the mark center of the detection mark can be obtained by using the movement of the holding tray in the transport direction and the movement of the mark position detection sensor. By using the circular detection mark, the center position of the mark can be accurately obtained without being affected by the skew of the holding tray, and the center position of the set portion can be accurately determined based on the accurate mark center. Can be sought.

  A recording apparatus according to a seventh aspect of the present invention includes a holding tray having a set portion for setting a recording material, a position detection system for the holding tray for detecting a center position of the setting portion of the holding tray, A recording execution device capable of executing recording on the recording material set on the holding tray based on the center position of the set unit obtained by the position detection system, and the position detection system of the holding tray includes: The detection mark is scanned along a circular detection mark provided on one surface of the holding tray and first and second scanning lines intersecting each other in the one surface, and the outer periphery of the detection mark and the detection mark A mark position detection sensor for detecting a position of an intersection with the scanning line, and a mark center position of the detection mark obtained based on the detected position of the intersection; It is characterized in that and a set portion center seeking unit for determining the center position of the mounting portion Te.

  According to this aspect, the same operations and effects as those of the first aspect can be obtained, the center position of the set portion can be obtained with high accuracy, and high-quality recording without positional deviation is realized. be able to.

  Hereinafter, a holding tray position detection system according to the present invention, a holding tray set portion center detection method executed by using the holding tray position detection system, and a recording apparatus including the holding tray position detection system explain. First, the inkjet printer 1 is taken up as the best mode for carrying out the recording apparatus of the present invention, and the outline of the overall configuration will be described with reference to the drawings.

  1 is a perspective view when the holding tray showing the internal structure of the ink jet printer is located at the set position, and FIG. 2 is a view when the holding tray showing the outline of the internal structure of the ink jet printer is located at the detection execution position. It is a sectional side view. The illustrated ink jet printer 1 according to this embodiment is a composite ink jet printer in which an image reading device (scanner) (not shown) is mounted on the upper portion, and a soft recording material such as paper or film, This is an ink jet printer that can perform recording on both a hard recording material Q such as an optical disc including a CD-R and a DVD-R.

  The inkjet printer 1 conveys the recording material Q using a holding tray 55 in which a set recess 71 and a chuck portion 72 for setting a hard recording material Q as a setting material are formed on the upper surface 55a. By reciprocally moving a recording material conveying device (conveying means) 5 that reciprocates in a direction A and a returning direction D and a carriage 40 on which the recording head 42 is mounted in a width direction B intersecting the conveying direction A. The central position O of the set recess 71 on the upper surface 55a of the holding tray 55, that is, the central position O of the chuck portion 72 is determined by the recording execution device 4 that performs desired recording and the mark position detection sensor 85 mounted on the carriage 40. This is basically configured by including a set center detecting device 7 for the required holding tray.

  In the recording material conveying device 5, a set recess 71 for setting the recording material Q and a chuck portion 72 for holding the inner peripheral edge 73 of the central opening of the recording material Q are formed on the upper surface 55a. A holding tray 55, and a conveyance roller 34 that includes a conveyance driving roller 35 and a conveyance driven roller 36 that sandwich the holding tray 55 and apply a conveyance force to the holding tray 55. Has been.

  The holding tray 55 is a rectangular flat plate member having a short depth dimension. The set recess 71 described above is formed at a position slightly ahead of the center position in the width direction B on the upper surface 55a of the holding tray 55 (FIG. 1), and the above-described chuck portion 72 is formed at the center of the set recess 71. Has been. The recording material Q, which is a material to be set that can be set on the holding tray 55, is a CD-R, CD-RW, DVD-R, DVD-RW, Various optical discs including a Blu-ray disc attracting attention as a next-generation optical disc and those to be developed in the future can be applied.

  The transport roller 34 has a long transport drive roller 35 extending in the width direction B, and a plurality of short transport rollers 35 that are in pressure contact with the peripheral surface of the transport drive roller 35 and arranged at appropriate intervals in the width direction B. It is comprised by the conveyance driven roller 36. FIG. The transport driving roller 35 is provided with respect to a roller driving shaft 35a that extends horizontally between side frames (not shown) in the apparatus main body.

  The recording execution device 4 basically includes a carriage 40 provided above the recording execution area 51, a recording head 42 mounted on the lower surface of the carriage 40, and a platen 38 provided below the recording execution area 51. It is structured.

  The carriage 40 is a member that can reciprocate along a carriage guide shaft 41 spanned along a width direction B that intersects the conveyance direction A of the recording material Q. The recording head 42 is a member that performs recording directly on the recording surface of the upper surface of the recording material Q by discharging ink supplied from an ink supply device (not shown) from a nozzle port (not shown) formed on the lower surface. is there. The platen 38 is a conveyance guide member for the recording material Q that supports the lower surface of the recording material Q conveyed to the recording execution area 51 and defines a gap PG between the lower surface of the recording head 42. is there.

[Example 1]
Next, it is executed by using the structure of the holding tray position detection system 7 according to the present embodiment applied to the ink jet printer 1 configured as described above and the holding tray position detection system 7. A method for detecting the center of the set portion of the holding tray will be specifically described with reference to the drawings.
FIG. 3 is a perspective view showing the holding tray, and FIG. 4 is a plan view showing the holding tray position detection system in a state where the holding tray has reached the detection execution position. FIG. 5 is an enlarged plan view of the main part showing the vicinity of the set position center detection mark on the return position side when the holding tray is skewed, and FIG. 6 is a home view when the holding tray is skewed. It is a principal part top view which expands and shows the set part center detection mark periphery of a position side (one-digit side).

  The holding tray position detection system 7 according to this embodiment includes two set portion center detection marks provided on the upper surface 55a of the holding tray 55 having a set recess 71 and a chuck portion 72 for setting the recording material Q. 80L, 80R and the set part center detection marks 80L, 80R are irradiated with light so as to cross at least from two intersecting plane directions, and intersection points 87L with the outer circumferences of the set part center detection marks 80L, 80R, Mark position detection sensor 85 for detecting 88L, 87R, 88R, 89L, 90L, 89R, 90R, and intersection points 87L, 88L, 87R, 88R detected by mark position detection sensor 85, 89L, 90L, 89R, Based on the position of 90R, the mark center positions 91L and 91R of the set center detection marks 80L and 80R are obtained. Includes the obtained mark center position 91L, a set portion center seeking unit 93 for obtaining the center position O of the set concave portion 71 on the basis of the 91R (the center position O of the chuck portion 72), the.

  The set center detection marks 80L and 80R are formed in a circular shape with a regular circle in plan view as a characteristic configuration of the present invention. In the present embodiment, the holes 81L that penetrate the upper surface 55a and the lower surface of the holding tray 55 are provided. 81R. In this embodiment, the mark center positions 91L and 91R of the two set portion center detection marks 80L and 80R are on a straight line passing through the center O of the chuck portion 72 and are equidistant from the center O. It is provided at the left and right outer positions of the set recess 71.

  In addition, identification marks 83L and 83R having a cross shape in plan view that are long in the width direction B and the conveyance direction A are provided around the set center detection marks 80L and 80R. The identification marks 83L and 83R are configured by white coating films 84L and 84R applied to the upper surface 55a of the holding tray 55, and the center of the set portion is determined by the brightness difference from the set portion center detection marks 80L and 80R. The outer peripheral positions of the detection marks 80L and 80R are easily detected.

  The mark position detection sensor 85 is constituted by a light reflection sensor as an example, and is provided in the vicinity of the recording head 42 on the lower surface of the carriage 40. The mark position detection sensor 85 emits light toward the positions of the set center detection marks 80L and 80R, reflects the reflected light, and irradiates and reflects the identification marks 83L and 83R. It has enough sensitivity to at least distinguish it from the returned light.

In this embodiment, the light emitted from the mark position detection sensor 85 due to the movement of the mark position detection sensor 85 in the width direction B and the movement of the holding tray 55 in the transport direction A is the mark for detecting the set portion center. 80 across the width direction B and the conveyance direction A, the first intersection points 87L and 87R and the second intersection points 88L and 88R in the width direction B, and the third intersection points 89L and 89R and the fourth intersection point in the conveyance direction A A total of eight intersections of 90L and 90R can be detected.
The mark position detection sensor 85 is not limited to the light reflection sensor, and may be a magnetic sensor, for example.

  The set portion center obtaining unit 93 obtains the mark center positions 91L and 91R of the set portion center detection marks 80L and 80R from the detected eight intersections, and sets based on the obtained two mark center positions 91L and 91R. Calculation processing for obtaining the center position O of the recess 71 is executed. Then, based on the center position O of the set recess 71 obtained by the set portion center obtaining unit 93, desired recording is performed by the recording execution device 4 described above.

  Next, a method for detecting the center of the set portion of the holding tray according to this embodiment, which is executed by using such a holding tray position detection system 7, will be described. The set part center detection method of the present embodiment includes (1) a first detection process, (2) a second detection process, and (3) a set part center determination process.

(1) First Detection Step First, by moving the holding tray 55 in which circular set portion center detection marks 80L, 80R are provided on the upper surface 55a in the transport direction A, the set portion center detection marks 80L, 80R is positioned on the movement line L of the mark position detection sensor 85. That is, after the conveyance motor 34 is driven and a passage detection sensor (not shown) detects the passage of the holding tray 55, the holding tray 55 is brought to the detection execution position 52 by further driving in a predetermined step.

  Then, the mark position detection sensor 85 is moved in the width direction B to cross the chuck center detection marks 80L and 80R, and at two intersections in the width direction B with the outer periphery of the set portion center detection marks 80L and 80R. The first intersections 87L and 87R and the second intersections 88L and 88R are detected.

  That is, the carriage 40 is moved from the return position to the home position side or from the home position to the return position side, and the light emitted from the mark position detection sensor 85 mounted on the lower surface of the carriage 40 is transmitted from the identification marks 83L and 83R. The positions of the first intersection points 87L and 87R and the second intersection points 88L and 88R are detected by passing the set center detection marks 80L and 80R.

(2) Second Detection Step First, with the mark position detection sensor 85 positioned above the set portion center detection marks 80L and 80R, the holding tray 55 is moved in the return direction D to set the set portion center. The detection marks 80 </ b> L and 80 </ b> R are positioned at upstream positions in the transport direction A of the mark position detection sensor 85.

  That is, (1) after the first detection step, when the mark position detection sensor 85 is positioned above the set center detection marks 80L and 80R, the set center detection mark is left as it is. If not positioned above 80L and 80R, the carriage 40 is moved to position the mark position detection sensor 85 above the set center detection marks 80L and 80R. Subsequently, the transport roller 34 is driven in a predetermined step in the reverse direction, the holding tray 55 is moved in the return direction D, and the set portion center detection marks 80L and 80R are transported behind the moving line L. A is positioned upstream of A.

  Then, the holding tray 55 is moved in the conveyance direction A, the mark position detection sensor 85 is crossed, and the third intersection 89L, which is two intersections in the conveyance direction A with the outer periphery of the set portion center detection marks 80L, 80R. , 89R and the fourth intersections 90L, 90R are detected. That is, the transport roller 34 is driven in the normal rotation direction in predetermined steps, and the light emitted from the mark position detection sensor 85 mounted on the lower surface of the carriage 40 is detected from the upstream identification marks 83L and 83R to detect the center of the set portion. The positions of the third intersection points 89L and 89R and the fourth intersection points 90L and 90R are detected by passing the marks 80L and 80R and the downstream identification marks 83L and 83R.

(3) Set portion center determining step In the set portion center determining step, the first intersection points 87L and 87R and the second intersection points 88L and 88R which are two intersection points in the width direction B and the two intersection points in the transport direction B are the first intersection points. The mark center positions 91L and 91R of the set portion center detection marks 80L and 80R are obtained from the positions of the three intersection points 89L and 89R and the fourth intersection points 90L and 90R, and the set recess 71 is determined based on the obtained mark center positions 91L and 91R. The center position O is obtained.

  That is, as shown in FIGS. 5 and 6, the perpendicular line passing through the midpoints of the first intersection points 87L and 87R and the second intersection points 88L and 88R, and the midpoints of the third intersection points 89L and 89R and the fourth intersection points 90L and 90R are represented. Find the intersection with the perpendicular that passes through. The intersections obtained in this way become the mark center positions 91L and 91R of the set center detection marks 80L and 80R. The mark center position 91L of the set position center detection mark 80L on the return position side and the mark center position 91R of the set position center detection mark 80R on the home position side are obtained independently. When the midpoint of the two mark centers 91L and 91R obtained in this way is obtained, the midpoint becomes the center position O of the set recess 71.

[Example 2]
The holding tray position detection system 7, the holding tray set portion center detection method, and the recording apparatus 1 according to the present invention are basically configured as described above, but do not depart from the gist of the present invention. Of course, it is possible to change or omit the partial configuration.

  FIG. 7 is a plan view showing an embodiment of a holding tray position detection system in which only one set portion center detection mark is provided on the holding tray. That is, in the holding tray position detection system 7A shown in FIG. 7, the set portion center detection mark 80 has a single circular shape in plan view and is positioned at the center position O of the chuck portion 72 on the upper surface 55a of the holding tray 55. Is provided. According to the holding tray position detection system 7A having such a structure, the obtained mark center position 91 becomes the center position O of the set portion 71 as it is. Accordingly, it is possible to obtain the center position O of the set recess 71 with a simple structure and without performing arithmetic processing. Furthermore, the center position O of the set recess 71 can be obtained with high accuracy without any influence of skew.

[Example 3]
FIG. 8 is a plan view showing an embodiment of a holding tray position detection system in which two set portion center detection marks are provided on the holding tray. That is, in the holding tray position detection system 7B shown in FIG. 8, two set portion center detection marks 80L and 80R are provided at positions deviating from the center position O of the set recess 71 in the transport direction A. Further, the mark center positions 91L and 91R of the two set portion center detection marks 80L and 80R are set so as to be positioned on a straight line parallel to the scanning line L when the holding tray 55 is not skewed. .

  Also with the holding tray position detection system 7B having such a structure, the relative positional relationship between the mark center positions 91L and 91R of the two set portion center detection marks 80L and 80R and the center position O of the set recess 71 is specified in advance. By doing so, the center position O of the set recess 71 can be accurately obtained without any influence of skew. That is, when skew occurs, it can be understood that the skew is generated in the holding tray 55 by obtaining the mark center positions 91L and 91R of the two set portion center detection marks 80L and 80R. The amount of skew can be obtained from the amount of deviation of the mark center positions 91L and 91R in the transport direction A by a simple calculation process, so that the center position of the set portion can be accurately obtained without being affected by the skew. Is possible.

[Example 4]
FIG. 9 is a plan view showing an embodiment of a holding tray position detection system in which three set portion center detection marks are provided on the holding tray. That is, in the holding tray position detection system 7C shown in FIG. 9, three set portion center detection marks 80L, 80C, and 80R are provided, and these three set portion center detection marks 80L, 80C, and 80R are provided. It is arranged on a concentric circle 95 at the center position O of the set recess 71. Then, the set portion center determining unit 93 estimates the circle 95 passing through these mark centers 91L, 91C, 91R from the obtained three mark center positions 91L, 91C, 91R, and the center of the estimated circle 95 Is determined as the center position O of the set recess 71.

  According to the present embodiment, the center position O of the set recess 71, which is the center position of the concentric circle 95, can be easily obtained based on the obtained three mark center positions 91L, 91C, 91R. Therefore, the center position O of the set recess 71 can be accurately obtained without being affected by the skew. Further, similarly to the second and third embodiments, the skew amount of the holding tray can be obtained at the same time.

[Other Examples]
In addition to the hole portion 81, the set portion center detection mark 80 is affixed or pasted to the holding tray 55 itself or a top surface 55a of the holding tray 55 which has a dark color such as black. It may be a sealing material or the like. Similarly, the identification mark 83 is not limited to the white coating 84, but is attached to the holding tray 55 itself or a top surface 55a of the holding tray 55 to which a bright color such as white or a fluorescent color with high reflectance is attached. It may be a sealing material or the like.

  In addition, the holding tray position detection system 7 and the recording apparatus 1 according to the present invention have a structure capable of supporting both the soft recording material and the hard recording material Q, and only the hard recording material Q. The structure which can respond | correspond to.

1 is a perspective view showing an internal structure of an ink jet printer according to the present invention. FIG. 3 is a side sectional view when a holding tray showing an outline of an internal structure of the ink jet printer is located at a detection execution position. The perspective view which shows a holding | maintenance tray. The top view which shows the position detection system of the holding tray of the state which the holding tray reached | attained the detection execution position. The principal part top view which expands and shows the detection mark periphery by the side of a return position in case the skew has arisen in the holding tray. The principal part top view which expands and shows the detection mark periphery by the side of a home position in case the skew has arisen in the holding tray. The top view which shows the other Example of the position detection system of a holding | maintenance tray. The top view which shows other Example of the position detection system of a holding | maintenance tray. The top view which shows the further another Example of the position detection system of a holding | maintenance tray. The top view which shows the problem of the conventional square hole of the state in which the skew has arisen in the holding tray.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Inkjet printer (recording apparatus), 4 recording execution apparatuses, 5 recording material conveying apparatus, 7 holding tray position detection system, 34 conveying roller, 35 conveying driving roller, 35a roller driving shaft, 36 conveying driven roller, 38 Platen, 40 Carriage, 41 Carriage guide shaft, 42 Recording head, 51 Recording execution area, 52 Detection execution position, 53 Set position, 55 Holding tray, 55a Top surface, 71 Set recess, 71a Bottom surface, 72 Chuck part, 73 Inner edge, 80 set portion center detection mark, 81 hole portion, 83 identification mark, 84 white coating film, 85 mark position detection sensor, 87 first intersection point, 88 second intersection point, 89 third intersection point, 90 fourth intersection point, 91 mark center , 93 Set part center seeking part, 95 Concentric circle (yen), 100 Hole, 101 detection center, 102 (original) center, Q (hard) recording material (optical disc), A transport direction, B width direction, D return direction, PG gap, O set center, L movement line, a Distance

Claims (7)

A circular detection mark provided on one surface of a holding tray having a set portion for setting a set material;
A mark position detection sensor that scans the detection mark along the first and second scanning lines intersecting each other in the one surface, and detects a position of an intersection between the outer periphery of the detection mark and the scanning line; ,
A holding tray position detection system comprising: a set portion center determining portion for determining a center position of the set portion based on a mark center position of the detection mark determined based on the detected position of the intersection. In the holding tray position detection system according to claim 1,
The holding tray is provided with a chuck portion for chucking a center portion of the set material to be set, in the set portion,
One holding mark is provided at the center of the chuck portion, and the holding tray position detecting system is characterized in that one detection mark is provided. In the holding tray position detection system according to claim 1,
There are two detection marks,
The holding portion position determining system is characterized in that the set portion center determining portion determines a center position of the set portion based on the two determined mark center positions. In the holding tray position detection system according to claim 3,
The two detection marks are on a straight line passing through the center of the set part, are equidistant from the center of the set part, and are provided at positions outside the set part. Position detection system. In the holding tray position detection system according to claim 1,
At least three detection marks are arranged on a concentric circle at the center of the set part,
The holding portion position detecting system, wherein the set portion center determining portion determines a center position of the set portion, which is a center position of the concentric circles, based on the determined at least three mark center positions. A holding tray provided with a circular detection mark is moved in the transport direction, the detection mark is positioned on the movement line of the mark position detection sensor, and the mark position detection sensor is moved on the movement line. A first detection step of detecting two intersections in the movement direction with the outer periphery of the detection mark;
With the mark position detection sensor positioned on the detection mark moving line when transporting the holding tray, the holding tray is moved in the transport direction to transport the mark to the outer periphery of the detection mark. A second detection step of detecting two intersections in the direction;
A set part center obtaining step for obtaining a mark center of the detection mark from two intersections in the moving direction and two intersections in the transport direction, and obtaining a center of the set part of the set material based on the obtained mark center;
A method for detecting the center of a set portion of a holding tray, comprising: A holding tray having a set portion for setting a recording material;
A holding tray position detection system for detecting a center position of a set portion of the holding tray;
A recording execution device capable of performing recording on the recording material set on the holding tray based on the center position of the set unit obtained by the position detection system,
The holding tray position detection system
A circular detection mark provided on one surface of the holding tray;
A mark position detection sensor that scans the detection mark along the first and second scanning lines intersecting each other in the one surface, and detects a position of an intersection between the outer periphery of the detection mark and the scanning line; ,
A recording apparatus comprising: a set part center determining unit that determines a center position of the set part based on a mark center position of the detection mark that is determined based on the detected position of the intersection.

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