KR100288696B1 - Apparatus for pollution prevention of a reference sheet in shuttle type multi funtion peripheral - Google Patents

Abstract

An object of the present invention is to prevent the reference sheet from being contaminated by the ink ejected from the printing head, so that an accurate white reference value can be detected.

Therefore, the present invention performs a scanning operation and a printing operation while reciprocating along a guide rail installed in a direction orthogonal to the conveying direction of paper while the scanning head and the printing head are accommodated in one carriage, and the scanning head is effective. A shuttle type multifunction apparatus comprising a reference sheet attached to a readable area outside a reading area and recorded with a white pattern: installed on the top of the reference sheet and opened and closed from the reference sheet to prevent contamination from ink scattered from the printing head. Possible protective cover; It includes opening and closing means for opening and closing the protective cover from the reference sheet; When the scanning head reaches the readable area of the reference sheet for the reading head to read the reference sheet, the protective cover is opened from the reference sheet by the opening and closing means, and the opening and closing as the scanning head is separated from the readable area of the reference sheet. Its feature is that the protective cover closes the reference sheet by means.

Description

Reference sheet contamination prevention device of shuttle type MFP {APPARATUS FOR POLLUTION PREVENTION OF A REFERENCE SHEET IN SHUTTLE TYPE MULTI FUNTION PERIPHERAL}

The present invention relates to a reference sheet contamination prevention device of a shuttle type multifunction device, and more particularly, to a shuttle type multifunction device including an inkjet printer and a shuttle type scanner, wherein the reference sheet is contaminated by ink sprayed from an inkjet printing head. The reference sheet contamination prevention apparatus of the shuttle type multifunction apparatus including a protective cover for preventing and a mechanism for controlling the opening and closing operation of the protective cover.

Recently, due to the development of office automation (OA) equipment and the increase of the penetration rate, the Multi Function Peripheral (MFP) has been proposed to perform multiple functions simultaneously as a single device. Here, the definition of complex functions can be divided into two categories.

First, it is a function of the integrated structure of office automation equipment (scanner, facsimile machine, copier, printer, etc.) required in the office environment. Second, the computer occupies a key position in the office environment (usually, ″ personal computer (PC) Is used to create new, more complex functions.

Among these, a multifunction printer in which a scanner, a facsimile, a copier, and a printer are integrated can be roughly classified into a shuttle type and an array type. In the array method, the time required for scanning an original is short and expensive, and the shuttle method has a long time required for scanning an original compared to the array method, but the price is cheaper.

On the other hand, in the shuttle type multifunction apparatus, the scanner sequentially scans a predetermined area of the original in one scanning operation, and this unit is called a slice. That is, the pixels of the slice scanned at one time according to the number of pixels of the photoelectric conversion element (″ charge coupled device (CCD) ″ or contact image sensor (CIS) ″ mounted in the scanner). The number is determined. In other words, the scanning operation by the scanner is performed by moving the scanning head from the leftmost edge of the document to the most right edge in slice units. In this case, the scanning head divides the document into bands to perform a scanning operation. In this case, one band refers to a range in which the original is scanned once in the horizontal direction by the scanning head.

In addition, the shuttle-type MFP has a white roller or a white panel or a white sheet (on a readable area outside the effective reading area of the scanning head in order to set a white reference value of the image data scanned by the scanner). A reference sheet consisting of White Paper) is attached. That is, the general scanning head outputs the scanning head even when the reference sheet on which the white pattern is printed due to the nonuniformity of the lamp and the nonuniformity of the sensitivity for each pixel of the photoelectric conversion element within the read width section is shown in FIG. 1. It becomes an uneven waveform ("A" part) as shown in FIG.

Correcting to reset this to the correct white reference value ("B" part) is called shading correction. In normal image processing, the shading phenomenon is a phenomenon occurring in an imaging tube such as a videoconductor, a cathode ray tube, and the like, and refers to a phenomenon in which the brightness varies depending on the screen portion of a television. This is caused by non-uniformity of the target or secondary redistribution from the target to the target, which improves the distorted image quality by mounting the adjusting electron lens. However, recently, the concept limited to such a display device has been applied to an image input device such as an image scanning device in an extended concept having the same meaning.

In other words, shading correction corrects the phenomenon that the edges of the screen are darkened or deformed due to the characteristics of the lens system when digitizing general documents, aerial photographs, etc. to generate digital image data for computers. The density conversion function is determined for each partition and the density is corrected so that the entire screen has a uniform brightness, and the shading data is obtained through shading correction through a dummy scanning process. Method and the like.

That is, the shading correction operation first scans the reference sheet attached to the device to calculate a shading correction coefficient for converting a waveform such as ″ A ″ of FIG. 1 into a flat white reference value such as ″ B ″. Then, by scanning the original and applying the shading correction coefficient to the scanned data to compensate, it is possible to obtain almost the same image information as the image recorded on the original.

Meanwhile, according to the mechanical structure of the shuttle multifunction apparatus, the scanning head and the printing head are accommodated in one carriage, and the scanning head and the printing head are simultaneously transferred as the driving force of the carriage return motor is transmitted to the carriage. At this time, the printing head is formed by spraying ink onto the recording paper through a nozzle while being spaced a predetermined distance from the recording paper to be transferred. Therefore, a phenomenon occurs in which peripheral parts are contaminated due to scattering of ink during the printing operation through the printing head.

However, such a conventional shuttle-type multifunction device does not have a separate equipment for preventing contamination by scattering ink. In particular, when a reference sheet attached to set a white reference value is contaminated by scattering ink, the following problem occurs.

That is, when the reference sheet is contaminated, an error occurs in the white reference value, and thus an error occurs in the image correction operation (for example, the shading correction operation). Therefore, distortion occurs in the scanning data. As a result, the image quality of the printed matter to be output is lowered, resulting in a decrease in reliability of the product.

Therefore, the present invention is to solve such a problem, an object of the present invention is to prevent the reference sheet is contaminated by the ink ejected from the printing head, the reference of the shuttle-type multifunction device capable of detecting an accurate white reference value It is to provide a sheet contamination prevention device.

1 is a voltage waveform obtained by the photoelectric conversion element of the scanning head when scanning the reference sheet,

2 is a schematic structural diagram of a shuttle scanner applied to embodiments of the present invention;

3 is a detailed structural diagram of a reference sheet contamination prevention apparatus according to a first embodiment of the present invention;

4 and 5 is an operating state of the reference sheet contamination prevention apparatus according to the first embodiment of the present invention,

6 is a detailed structural diagram of a reference sheet contamination prevention apparatus according to a second embodiment of the present invention;

7 and 8 is an operating state of the reference sheet contamination prevention apparatus according to a second embodiment of the present invention,

9 is a detailed structural diagram of a reference sheet contamination prevention apparatus according to a third embodiment of the present invention;

10 and 11 are operation state diagrams of the reference sheet contamination prevention apparatus according to a third embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

203: Scanning Head 204: Printing Head

205: carriage 206: guide rail

207: Carriage Return Motor

210: Reference Sheet 211: Home A'ssy

212, 601, 901: Protective cover 213: Guide pin

214: Cover Damper 215, 603, 905: elastic member

217: side frame 218: pedestal

219, 906: guide slot

220: guide panel 221: carriage damper

602, 909: contact 902: pinion gear

903: Gear Shaft 904: Bushing

907: Stopper Pin 908: Rack Gear

A feature of the present invention for achieving the above object is a scanning operation and a printing operation while reciprocating along a guide rail installed in a direction orthogonal to the conveying direction of paper while the scanning head and printing head are accommodated in one carriage. A shuttle type multifunction apparatus comprising a reference sheet attached to a readable area outside the effective reading area of a scanning head and having a white pattern recorded thereon: a reference sheet to prevent contamination from ink scattered in the printing head. A protective cover installed at the top and openable from the reference sheet; It includes opening and closing means for opening and closing the protective cover from the reference sheet; When the scanning head reaches the readable area of the reference sheet for the reading head to read the reference sheet, the protective cover is opened from the reference sheet by the opening and closing means, and the opening and closing as the scanning head is separated from the readable area of the reference sheet. The protective cover is in such a way as to close the reference sheet.

Here, the opening and closing means receives the movement force of the carriage to control the opening and closing operation of the protective cover.

In addition, the opening and closing means includes a guide pin protruding from the protective cover; A guide panel including a guide slot coupled to the guide pin and processed to correspond to a movement trajectory of the protective cover to guide the guide pin when the carriage contacts the protective cover and the protective cover moves toward the side frame of the shuttle scanner. ; It is provided between the protective cover and the side frame, and includes an elastic member for holding the protective cover against the carriage side on the movement trajectory of the protective cover.

The apparatus may further include a cover damper attached to one end of the protective cover opposite to the carriage to mitigate an impact when the carriage and the protective cover are in contact. The cover damper may be attached to one side of the carriage opposite to the protective cover. It may further include a carriage damper to mitigate the impact when the contact.

Further, when the protective cover is separated from the reference sheet, an inclined surface having a predetermined slope is formed so that the protective cover moves in a suspended state by a predetermined height, and a pedestal installed on the movement trajectory of the protective cover to guide the movement path of the protective cover. It may further include.

In addition, the protective cover is processed into a rounded shape in the area that is in contact with the inclined surface of the support when moving the movement trajectory.

On the other hand, the opening and closing means may be in contact with one side of the carriage facing the protective cover, the contact portion bent upward from one side of the protective cover facing the carriage to expand the area in contact with one side of the carriage; It is installed between the other side and the side frame of the protective cover opposite to the contact portion, and includes an elastic member for pressing the protective cover to the carriage side on the movement trajectory of the protective cover.

On the other hand, the opening and closing means is formed on one side of the protective cover, integrally configured with the protective cover, and the pinion gear rotatable about the gear shaft; A bushing mounted on the guide rail at the point where the reference sheet is attached and movable on the guide rail; A rack gear integrally formed with the bushing and engaged with the pinion gear to convert the linear motion of the bushing into the rotational motion of the pinion gear; It is provided on the guide rail between the side frame and the bushing, and includes an elastic member for pressing the bushing to the carriage side on the movement trajectory of the bushing.

In addition, the guide slot machined by a predetermined length in the longitudinal direction of the bushing; It may further include a stopper pin extending in a vertical direction from the guide rail, coupled to the guide slot, and preventing the bushing from moving beyond the predetermined distance to the carriage side to prevent the bushing from being separated to the carriage side.

The predetermined length is the length from the position where the protective cover can sufficiently open the reference sheet to the position where the carriage does not contact the protective cover when the protective cover closes the reference sheet and the carriage moves on the effective scanning area. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the elements of each drawing, it should be noted that the same elements are denoted by the same reference numerals as much as possible even if they are displayed on different drawings. In addition, in the following description there are shown a number of specific details, such as components of the specific circuit, which are provided only to help a more general understanding of the present invention that the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

<1st Example of this invention>

2 is a schematic structural diagram of a shuttle scanner applied to embodiments of the present invention, Figure 3 is a detailed structural diagram of a reference sheet contamination prevention apparatus according to a first embodiment of the present invention, Figure 4 And FIG. 5 is an operation state diagram of the reference sheet contamination prevention apparatus according to the first embodiment of the present invention.

First, referring to FIG. 2, the main frame 201 supporting the shuttle-type multifunction apparatus and the base frame 202 forming a conveyance path of paper have an integrated structure.

In addition, the scanning head 203 is installed spaced apart from the effective reading area of the document by a predetermined distance, the scanning head 203 for scanning the image information recorded on the document, and separated from the effective printing area of the recording paper by a predetermined distance and the scanning head 203 A printing head 204 which is installed adjacent to and prints image information, a carriage 205 supporting the scanning head 203 and the printing head 204 simultaneously, and a guide rail for guiding the carriage 205 in a left-right reciprocating motion ( Guide rail) 206, a carriage return motor 207 that provides driving force for the carriage 205 to reciprocate from side to side, and a carriage return motor 207 and carriage 205 simultaneously. A transfer belt 208 which is mounted and transfers the driving force of the carriage return motor 207 to the carriage 205, and a pickup roller which picks up the originals loaded on the cassette (not shown) and feeds them onto the transfer path of the originals ( Not shown ), A drive roller 209 for transferring the document picked up by the pickup roller to the effective reading area of the scanning head 203 and the effective printing area of the printing head 204, and an ejection for discharging the document whose scanning operation is completed. One side readable area of the base frame 202 included in the roller (not shown) and the flow trace of the carriage 205 and beyond the effective reading area of the scanner head 203 and the effective printing area of the printing head 204. The reference sheet 210 includes a reference sheet 210 on which a white pattern of a predetermined type is attached to and attached to the scanning head 203.

And, a home assay in which a capping device (not shown) is installed to prevent the nozzle of the printing head 204 from being dried at a point opposite from the point where the reference sheet 210 is attached, that is, the base frame 202. 211 is configured.

Meanwhile, referring to FIG. 3, the structure of the pollution prevention device is described in detail. A protective cover 212 having a size enough to cover the reference sheet 210 and an outer side of one or both sides of the protective cover 212 may be described. Consists of a guide pin (213) protruding into.

In addition, a cover damper 214 is provided at one end of the protective cover 212 opposite to the carriage 205 to mitigate an impact upon contact with the carriage 205, and a protective cover facing from the cover damper 214. The other end of the 212 is provided with an elastic member 215 for holding the protective cover 212 on the movement trajectory of the protective cover 212. On the other side of the elastic member 215, a supporting member 216 having a predetermined slope is attached to the side frame 217 so that the elastic force of the elastic member 215 can be efficiently transmitted to the protective cover 212. .

On the other hand, when the protective cover 212 is separated from the reference sheet 210, the inclined surface having a predetermined inclination is formed so that the protective cover 212 moves in a suspended state by a predetermined height, and the movement path of the protective cover 212 is formed. A guide 218 for guiding is installed on the movement trajectory of the protective cover 212, and the protective cover 212 simultaneously guides the movement trajectory of the protective cover 212 when the protective cover 212 moves in a lifted state. The guide panel 220 is provided with a guide slot 219 is processed to a size similar to the size of the guide pin 213 to support the support state of the.

In addition, a carriage damper 221 of FIG. 4 having the same shape and function as the cover damper 214 is attached to one end of the carriage 205 opposite the cover damper 214 of the protective cover 212. The contact surfaces of the 214 and the carriage damper 221 are surface treated to be easily slidable from each other. The contact portion of the protective cover 212 that contacts the inclined surface of the pedestal 218 is processed into a rounded shape such that the protective cover 212 can easily move on the inclined surface of the pedestal 218.

An operation of the first embodiment having such a configuration will be described in detail with reference to FIGS. 4 and 5.

When the carriage 205 moves away from the initially positioned home assay 211 and moves in the ″ A ″ direction to adjust the white reference value, the carriage damper 221 attached to the carriage 205 is attached to the protective cover 212. The cover damper 214 is brought into contact with each other, and the protective cover 212 is moved toward the elastic member 215 while slidingly moving along the surface of the pedestal 218 by the moving force of the carriage 205. At this time, the protective cover 212 as the guide pin 213 is moved along the guide slot 219 is processed to have the same inclined surface and the inclined surface of the pedestal 218, the protective cover 212 as shown in FIG. It becomes a state. At this time, the elastic member 215 is in a state where the elastic force is accumulated. As shown in FIG. 5, when the protective cover 212 is separated from the reference sheet 210, the scanning head 203 scans the white pattern recorded on the reference sheet 210 to detect the white reference value.

When the white reference value detection process is completed, the carriage 205 moves in the direction ″ B ″ of FIG. 5, and the guide pin 213 moves along the guide slot 219 by the elastic force of the elastic member 215. Thus, the protective cover 212 covers the reference sheet 210.

On the other hand, the scanning head 203 and the printing head 204 moved in the &quot; B &quot; direction after finishing the image adjustment operation (white reference value detection operation and shading correction operation, etc.) perform scanning and printing operations on originals and recording paper. At this time, since the reference sheet 210 is covered by the protective cover 212, it is possible to prevent contamination from the ink scattered from the printing head 204.

<2nd Example of this invention>

6 is a detailed structural diagram of a reference sheet contamination prevention apparatus according to a second embodiment of the present invention, Figures 7 and 8 is an operational state diagram of the reference sheet contamination prevention apparatus according to a second embodiment of the present invention. It is. In the second embodiment of the present invention, the rest of the components except for the configuration of the pollution prevention device can be applied in the same manner as the configuration of Figure 2, the drawings and description of the overall configuration of the shuttle-type multifunction device will be found in advance that is omitted. .

Referring to Figure 6 in detail the structure of the pollution prevention device, a protective cover 601 of a size sufficient to cover the reference sheet 210 is installed on the upper portion of the reference sheet 210, one of the carriage 205 One side of the protective cover 601 which is in contact with the side is formed with a contact portion 602 bent upward to expand the area in contact with one side of the carriage 205.

In addition, an elastic member 603 is provided between the other side of the protective cover 601 opposite to the contact portion 602 and the side frame 217 to support the protective cover 601 on the movement trajectory of the protective cover 601. .

At this time, the protective cover 601 is installed to make a sliding movement between the reference sheet 210 and the side frame 217 by the movement force of the carriage 205 after one side of the carriage 205 and the contact portion 602 is in contact. do.

The operation of the second embodiment having such a configuration will be described in detail with reference to FIGS. 7 and 8.

When the carriage 205 moves away from the initially positioned home assay 211 and moves in the ″ C ″ direction (see FIG. 7) to adjust the white reference value, one side of the carriage 205 is formed on the protective cover 601. In contact with the contact portion 602, the protective cover 601 moves toward the side frame 217 by the moving force of the carriage 205. At this time, the elastic member 603 is in a state where the elastic force is accumulated. Thus, the protective cover 601 is in a state as shown in FIG. 8. When the protective cover 601 is separated from the reference sheet 210 as shown in FIG. 8, the scanning head 203 detects the white reference value by scanning the white pattern recorded on the reference sheet 210.

When the white reference value detection process is completed, the carriage 205 moves in the direction ″ D ″ of FIG. 8, and the protective cover 601 moves toward the reference sheet 210 by the elastic force of the elastic member 603. Accordingly, the protective cover 601 covers the reference sheet 210.

On the other hand, the scanning head 203 and the printing head 204 moved in the &quot; D &quot; direction after finishing the image adjustment operation (white reference value detection operation and shading correction operation, etc.) perform scanning and printing operations on originals and recording paper. At this time, since the reference sheet 210 is covered by the protective cover 601, it is possible to prevent contamination from ink scattered from the printing head 204.

<3rd Example of this invention>

9 is a detailed structural diagram of a reference sheet contamination prevention apparatus according to a third embodiment of the present invention, and FIGS. 10 and 11 are operational state diagrams of the reference sheet contamination prevention apparatus according to a third embodiment of the present invention. It is. In the third embodiment of the present invention, the rest of the components except the configuration of the pollution prevention apparatus can be applied in the same manner as the configuration of FIG. .

Referring to Figure 9 in detail the structure of the pollution prevention device, a protective cover 901 of a size that can sufficiently cover the reference sheet 210, and a pinion gear (pinion gear formed on one side of the protective cover 901) 902. At this time, the protective cover 901 is formed in a substantially flat plate shape, the pinion gear 902 has a structure integrated with the protective cover 901. The pinion gear 902 is rotatable with respect to the gear shaft 903.

In addition, a bushing 904 is installed on the guide rail 206 at the point where the reference sheet 210 is attached, wherein the bushing 904 is movable on the guide rail 206 and the bushing 904. An elastic member 905 is installed between the side frame 217 and the bushing 904. In addition, a guide slot 906 is formed at a predetermined length in the longitudinal direction at a predetermined position of the bushing 904, and the bushing 904 is prevented from being separated toward the carriage 205 in a state of being coupled to the guide slot 906. A stopper pin 907 extending from the guide rail 206 is formed.

On the other hand, at the point where the bushing 904 and the pinion gear 902 face each other, the rack gear 908 is formed in an integrated structure with the bushing 904, and the rack gear 908 meshes with the pinion gear 902.

In addition, at one side of the carriage 205 facing the bushing 904, a contact portion 909 is formed in contact with the bushing 904 to transmit the moving force of the carriage 205 to the bushing 904.

The operation of the third embodiment having such a configuration will be described in detail with reference to FIGS. 10 and 11.

When the carriage 205 leaves the initially positioned home assay 211 and moves in the ″ E ″ direction (see FIG. 10) to adjust the white reference value, the contact 909 attached to the carriage 205 is bushing 904. ) Is pushed toward the side frame 217, so that the bushing 904 moves to the side frame 217.

When the bushing 904 moves, the rack gear 908 integrated with the bushing 904 moves, and the pinion gear 902 meshed with the rack gear 908 rotates about the gear shaft 903. Thus, the protective cover 901 is rotated about the gear shaft 903, and thus the reference sheet 210 is opened as shown in FIG. At this time, the elastic member 905 is in a state where the elastic force is accumulated.

As shown in FIG. 11, when the protective cover 901 is separated from the reference sheet 210, the scanning head 203 scans the white pattern recorded on the reference sheet 210 to detect the white reference value.

When the white reference value detection process is completed, the carriage 205 moves in the direction ″ F ″ of FIG. 11, and the bushing 904 moves along the guide rail 206 by the elastic force of the elastic member 905. Accordingly, the protective cover 901 rotates about the gear shaft 903 and covers the reference sheet 210. At this time, the stopper pin 907 moves along the guide slot 906 of the bushing 904. When the stopper pin 907 reaches the end of the guide slot 906, the bushing 904 cannot move further. Is stopped.

On the other hand, the scanning head 203 and the printing head 204 moved in the &quot; F &quot; direction after finishing the image adjustment operation (white reference value detection operation and shading correction operation, etc.) perform scanning and printing operations on originals and recording paper. At this time, since the reference sheet 210 is covered by the protective cover 901, it is possible to prevent contamination from the ink scattered from the printing head 204.

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

As a result, according to the reference sheet contamination prevention apparatus of the shuttle-type multifunction device according to the present invention, the following advantages occur.

That is, since the protective cover is separated from the reference sheet only when the image adjustment operation is performed, and the protective cover keeps covering the reference sheet when the scanning operation of the document or the printing sheet is performed, the ink scattered during the printing operation The reference sheet can be prevented from being contaminated.

Claims (11)

Scanning and printing are performed while reciprocating along a guide rail installed in a direction perpendicular to the conveying direction of paper while the scanning head and the printing head are stored in one carriage, and out of the effective reading area of the scanning head. In a shuttle multifunction machine comprising a reference sheet attached to a readable area and recorded with a white pattern: A protective cover installed at an upper end of the reference sheet and openable and openable from the reference sheet to prevent contamination from ink scattered from the printing head; And And opening and closing means for opening and closing the protective cover from the reference sheet; When the scanning head reaches the readable area of the reference sheet for the scanning head to read the reference sheet, the protective cover is opened from the reference sheet by the opening and closing means, and the scanning head is the reference sheet. The reference sheet contamination prevention apparatus of the shuttle type multifunction apparatus according to claim 1, wherein the protective cover closes the reference sheet by the opening and closing means. The method of claim 1, wherein the opening and closing means, Reference sheet contamination prevention device of the shuttle type multifunction device, characterized in that to control the opening and closing operation of the protective cover by receiving the movement force of the carriage. The method of claim 2, wherein the opening and closing means, A guide pin protruding from the protective cover; The guide pin is coupled, the guide is processed in a shape corresponding to the movement trajectory of the protective cover to guide the guide pin when the carriage is in contact with the protective cover and the protective cover is moved to the side frame side of the shuttle scanner A guide panel including a slot; And And a resilient member installed between the protective cover and the side frame and pressurizing the protective cover to the carriage side on a moving track of the protective cover. The method of claim 3, wherein And a cover damper attached to one end of the protective cover opposite to the carriage to mitigate an impact when the carriage and the protective cover are in contact with each other. The method of claim 3, wherein And a carriage damper attached to one side of the carriage opposite the protective cover to mitigate an impact when the protective cover and the carriage come into contact with each other. The method of claim 3, wherein An inclined surface having a predetermined slope is formed to move in a state where the protective cover is lifted by a predetermined height when the protective cover is separated from the reference sheet, and the movement track of the protective cover is guided to guide the movement path of the protective cover. Reference sheet contamination prevention device of the shuttle multifunction device further comprising a pedestal installed on. The method of claim 6, wherein the protective cover, The reference sheet contamination prevention device of the shuttle type multifunction machine, characterized in that the portion which is in contact with the inclined surface of the pedestal when the moving trajectory is moved in a rounded shape. The method of claim 2, wherein the opening and closing means, A contact portion which is in contact with one side of the carriage facing the protective cover and is bent upward from one side of the protective cover facing the carriage to expand an area in contact with one side of the carriage; And Reference sheet contamination of the shuttle type multifunction apparatus including an elastic member which is installed between the other side of the protective cover and the side frame opposite to the contact portion, and presses the protective cover to the carriage side on the movement trajectory of the protective cover. Prevention device. The method of claim 2, wherein the opening and closing means, A pinion gear formed on one side of the protective cover, integrally formed with the protective cover, and rotatable about a gear axis; A bushing mounted on the guide rail at the point where the reference sheet is attached and movable on the guide rail; A rack gear integrally formed with the bushing and engaged with the pinion gear to convert a linear motion of the bushing into a rotational motion of the pinion gear; And And a resilient member installed on the guide rail between the side frame and the bushing, the elastic member pressing the bushing toward the carriage on the moving track of the bushing. The method of claim 9, A guide slot machined by a predetermined length in the longitudinal direction of the bushing; And And a stopper pin extending from the guide rail in a vertical direction, coupled to the guide slot, and preventing the bushing from moving beyond the predetermined distance to the carriage side to prevent the bushing from being separated from the carriage side. Reference sheet contamination prevention device for shuttle multifunction devices. The method of claim 10, wherein the predetermined length, From the position where the protective cover can sufficiently open the reference sheet to the position where the carriage does not contact the protective cover when the protective cover closes the reference sheet and the carriage moves on the effective scanning area. Reference sheet contamination prevention device of the shuttle-type multifunction device characterized in that the length.