JP2007306136A - Image reading apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reading apparatus capable of preventing an adverse effect on a reading operation of a carriage due to a contact between harness wires and motive power transmission members and avoiding the harness wires from being damaged due to a contact of the harness wires with an inner edge of an insertion hole of a sheet-metal-made chassis member. <P>SOLUTION: In the image reading apparatus provided with the carriage movably supported along a guide rail 72 formed on the sheet-metal-made chassis member and scanning an image of an original on a platen glass, the power transmission members 56, 57 for delivering the motive power of a drive motor to the carriage, and the harness wires 45 wired from the insertion hole 40 provided to a side face 72d of the guide rail 72, a synthetic-resin-made wire protection cover 41 integrally formed with a cylindrical main body part 42 for covering the inner edge part 40a of the insertion hole 40 and an eaves part 43 projected from the main body part 42 in a manner of being extended between the harness wires 45 wired from the insertion hole 40 and the power transmission members 56, 57 is mounted to the insertion hole 40. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image reading apparatus that scans and reads an image of a document on a platen glass with a carriage that is movably supported along a guide rail, and more particularly to a chassis member that constitutes a chassis portion of the image reading apparatus. The present invention relates to an image reading apparatus having a harness wiring arranged out of the inserted hole.

An image reading apparatus included in a scanner, a facsimile, a copying machine, or the like includes a carriage on which a light source and a reflection mirror are mounted, as shown in Patent Document 1, and an image of an original placed on a platen glass by the carriage. The original image is read by scanning and guiding the scanned image to an imaging unit such as a CCD. In this type of image reading apparatus, a sheet metal chassis member constituting a chassis portion of the image reading apparatus, a guide rail installed on the chassis member that movably supports the carriage, and the power of the drive motor to the carriage. A power transmission member for transmission, and a harness wiring arranged out of an insertion hole provided in the chassis member.
JP 2002-72055 A

  However, in this image reading apparatus, when the installed harness wiring is bent due to poor installation at the time of assembly or maintenance, or when the power transmission member is bent due to an impact during driving In this case, there is a problem in that the harness wiring and the power transmission member come into contact with each other, adversely affecting the movement of the carriage, leading to a decrease in image reading accuracy. Further, there is a possibility that the harness wiring may be damaged when it contacts the power transmission member. On the other hand, when the inner edge portion of the insertion hole provided in the chassis member made of sheet metal is not hemmed, an unprocessed sharp sheet metal cut surface may be exposed at the inner edge portion. In such a state, there is a possibility that the harness wiring inserted through may come into contact with the cut surface and be damaged.

  The present invention has been made in view of the above-described points, and an object of the present invention is to prevent the harness wiring from coming into contact with the power transmission member and adversely affecting the reading operation of the carriage, and to be provided on a sheet metal chassis member. An object of the present invention is to provide an image reading apparatus capable of preventing a harness wiring inserted through an insertion hole from being damaged by coming into contact with an inner edge of the insertion hole.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present application provides an image of a document on a platen glass that is supported so as to be movable along a sheet metal chassis member and a guide rail installed on the chassis member. In the image reading apparatus, comprising: a carriage that scans and scans; a power transmission member that transmits power of a driving motor to the carriage; and a harness wiring that is disposed out of an insertion hole provided in the chassis member. A cylindrical main body portion that is inserted into the hole and covers the inner edge portion thereof, and an eave portion that protrudes from the main body portion so as to extend between the harness wiring extending from the insertion hole and the power transmission member. A synthetic resin wiring protection cover formed integrally is mounted in the insertion hole.

  According to a second aspect of the present invention, in the image reading apparatus according to the first aspect, the guide rail protrudes from an upper surface of the chassis member and is integrally formed with the chassis member, and the insertion hole is formed in the insertion hole. The power transmission member is stretched above the harness wiring that is formed to open in the side surface portion of the guide rail and protrudes from the insertion hole.

  According to a third aspect of the present invention, in the image reading device according to the second aspect, the eaves portion of the wiring protection cover is formed in a plate shape that covers the upper side of the harness wiring extending from the insertion hole. It is characterized by being.

  The invention according to claim 4 of the present application is the image reading apparatus according to claim 3, wherein both ends of the eaves portion in the extending direction of the power transmission member are on both sides of the harness wiring that protrudes from the insertion hole. It is characterized by being a curved part which curves so as to surround the part.

  According to the invention described in claim 1 of the present application, even when the harness wiring coming out from the insertion hole is bent and floats or when the power transmission member is bent, the harness wiring and power Since the contact of the transmission member can be prevented, it is possible to prevent the reading operation of the carriage from being adversely affected and to prevent the image reading accuracy from being lowered. In addition, since the inner edge of the insertion hole is covered by the main body of the wiring protective cover, there is no risk that the harness wiring will come into contact with the inner edge even if an unprocessed sharp sheet metal cut surface is exposed. Therefore, it is possible to prevent the harness wiring from being damaged. In addition, since the wiring protection cover with the eaves formed integrally is directly attached to the chassis member made of sheet metal, the position of the eaves is not shifted even if the harness wiring or power transmission member contacts the eaves. It has excellent impact strength. Further, since the wiring protection cover is attached to the insertion hole of the chassis member, it can be easily attached.

  According to the invention described in claim 2 of the present application, the harness wiring that protrudes from the insertion hole formed in the side surface portion of the guide rail that protrudes from the upper surface of the chassis member is bent and floated or stretched upward. Even when the installed power transmission member bends and hangs down, the harness wiring and the power transmission member can be prevented from contacting each other.

  According to invention of Claim 3 of this application, it can prevent that a harness wiring and a power transmission member contact with the wiring protective cover of a simple structure.

  According to the invention described in claim 4 of the present application, by providing the curved portions at both ends in the extending direction of the power transmission member of the eaves portion, the harness wiring that is lifted up from the both ends of the eaves portion to the power transmission member side Therefore, it is possible to effectively prevent the harness wiring from coming into contact with the traveling power transmission member. Further, even when the power transmission member bends and contacts the eaves part, the power transmission member is not caught by the eaves part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an image forming apparatus including an image reading apparatus according to an embodiment of the present invention. First, a schematic overall configuration of the image forming apparatus will be described with reference to FIG. The image forming apparatus according to the present invention may be any of a copier, a facsimile machine, a printer, or a so-called multifunction machine having these functions as long as the image forming apparatus includes an image reading device. The image forming apparatus 1 shown in FIG. 1 includes a recording unit 2 installed on the lower side and a reading unit 3 installed on the upper side. The recording unit 2 includes a recording device 4, a paper feed cassette 5, and a recording paper discharge tray 6. The paper stored in the paper feed cassette 5 is fed to the recording device 4. After recording, the paper is discharged to the recording paper discharge tray 6.

  The reading unit 3 scans and reads an image of a document, an operation panel 7 attached to a side portion on the front side of the image reading device 10, and one side of the image reading device 10 on the upper side. And a document presser cover 8 attached so as to be openable and closable by a hinge mechanism not to be opened. An automatic paper feeder (ADF device) 20 that automatically feeds a document is attached to one end of the document pressing cover 8.

  FIG. 2 is a side sectional view showing the detailed configuration of the image reading apparatus 10 and the automatic paper feeder 20. The automatic paper feeder 20 includes a document tray 21 on which a plurality of documents are stacked and held, a laterally U-shaped transport path 22, a paper discharge tray 23 on which the transported documents are stacked and held, and a document on the document tray 21. Pick-up roller 24 and paper feed roller 25 for feeding the paper to the conveyance path 22, a conveyance roller 26 for conveying the document by nipping the conveyance path 22, a discharge roller 27 provided near the exit of the conveyance path 22, and a reading position And a CIS reading unit 28 having a contact image sensor (hereinafter referred to as “CIS”) that reads an image of a document at P2.

  FIG. 3 is a schematic plan view showing the configuration of the image reading apparatus 10. Note that the image reading apparatus 10 shown in FIG. 2 shows a section taken along the line AA in FIG. As shown in FIGS. 2 and 3, the image reading apparatus 10 includes a sheet metal chassis member 70 that constitutes a chassis portion of the image reading apparatus 10, a bottom surface portion 31, and a side wall portion 32. A cover member 30 to be installed and an upper cover 35 shown in FIG. 2 that covers an upper portion of a carriage storage portion 33 formed inside the side wall portion 32 are provided. The cover member 30 and the upper cover 35 are both made of synthetic resin, and a platen glass 36 is installed on the upper surface portion 35 a of the upper cover 35. In FIG. 3, the upper cover 35 is not shown. The chassis member 70 includes a flat bottom surface 71 and a pair of guide rails 72 and 72 that are integrally formed on the front and back surfaces of the bottom surface 71. These guide rails 72, 72 protrude into the carriage storage portion 33 from an opening 31 a formed in the bottom surface portion 31 of the cover member 30. The guide rails 72, 72 are laid in parallel in the longitudinal direction in the left-right direction, have a substantially rectangular cross-sectional shape protruding upward from the bottom surface portion 71 of the chassis member 70, and the top surface of the guide rails 72, 72 is a flat surface. It is a moving surface 72a, 72a. An operation panel installation section 34 for installing the operation panel 7 is provided outside the carriage housing section 33 on the front side.

A full rate carriage 12 and a half rate carriage 15 that are supported at both ends by guide rails 72 and 72 are installed in the carriage housing portion 33. These are movable in the left-right direction along the guide rails 72, 72 in the carriage storage portion 33.
The full-rate carriage 12 includes a main body portion 12a having both ends thereof mounted on the sliding surfaces 72a and 72a of the guide rails 72 and 72, a light source lamp 13 and a reflection mirror 14 mounted on the main body portion 12a. Yes. The half-rate carriage 15 includes a main body portion 15a, a flat plate-like support member 16 that is attached to the main body portion 15a and has both end portions placed on the sliding surfaces 72a and 72a of the guide rails 72 and 72, and A pair of reflecting mirrors 17 and 17 are provided above and below the support member 16.

  As shown in FIG. 3, the imaging unit 18 and the inverter device 19 are installed on the bottom surface portion 71 of the chassis member 70 exposed from the openings 31 b and 31 c provided in the bottom surface portion 31 of the cover member 30. . The imaging unit 18 is a CCD imaging unit including an imaging lens 18a that converges incident reflected light, and a CCD image sensor (photoelectric element) 18b that converts an optical image generated by the convergent light into image data. The inverter device 19 is a device for stabilizing the irradiation light of the light source lamp 13.

  A carriage drive mechanism 50 is installed inside the guide rails 72, 72. The carriage drive mechanism 50 includes drive pulleys 51 and 51 installed at the inner positions of the right end portions 72b and 72b of the guide rails 72 and 72, and driven pulleys 53 and 53 installed at the inner positions of the left end portions 72c and 72c. In addition, endless power transmission members 56 and 56 are wound between the drive pulleys 51 and 51 and the driven pulleys 53 and 53. The drive pulleys 52 and 52 are installed at the inner positions of the right end portions 72b and 72b of the guide rails 72 and 72, and the driven pulleys 54 and 54 are installed at the inner positions of the left end portions 72c and 72c. Endless power transmission members 57 and 57 are wound between 52 and 52 and driven pulleys 54 and 54. One power transmission member 56, 56 is fixed to the full rate carriage 12, and the other power transmission member 57, 57 is fixed to the half rate carriage 15. The drive pulleys 51, 51 and the drive pulleys 52, 52 are all attached to a drive shaft 58, the driven pulleys 53, 53 are attached to a rotating shaft 64, and the driven pulleys 54, 54 are attached to a rotating shaft 65. The power transmission members 56 and 56 and the power transmission members 57 and 57 are installed at inner positions 72d and 72d of the guide rails 72 and 72, and are stretched in a direction along the guide rails 72 and 72.

  As shown in FIG. 3, a drive motor 60 is disposed outside the carriage housing 33 on the back side. One end of the drive shaft 58 is disposed adjacent to the drive motor 60, and between the pulley 59 attached to one end of the drive shaft 58 and the pulley 62 attached to the rotation shaft 60a of the drive motor 60, A power transmission member 63 is stretched over and the rotation of the drive motor 60 is transmitted to the drive pulleys 51 and 51 and the drive pulleys 52 and 52. The ratio of the diameters of the drive pulley 51 and the drive pulley 52 is approximately ½. Thus, the scanning speed and scanning distance of the half-rate carriage 15 with respect to the scanning speed and scanning distance of the full rate carriage 12 are both set to be approximately ½.

  The full rate carriage 12 and the half rate carriage 15 move along the guide rails 72, 72 from the left end to the right direction from the left end by the circumferential motion of the power transmission members 56, 57 driven by the drive motor 60. At that time, as shown in FIG. 2, the original on the platen glass 36 is irradiated with light from the light source lamp 13 of the full-rate carriage 12, and the reflected light from the original is sequentially reflected by the reflection mirrors 14, 17, and 17. By being guided to the image unit 18, the image of the document is read.

  When the image reading device 10 reads a document image as a flat bed scanner, the document pressing cover 8 is closed and the document placed on the platen glass 36 is pressed and fixed. In this state, the original image is read by the image reading apparatus 10. On the other hand, when reading an original image using the automatic paper feeder 20, the original fed from the original tray 21 to the conveyance path 22 is reversed so as to make a U-turn from above to below along the conveyance path 22. Then, when reaching the reading position P1 and passing through the reading position P1, the image reading apparatus 10 in which the full-rate carriage 12 and the half-rate carriage 15 are aligned with the reading position P1 reads the image on the front side of the document. . Further, when the original is transported through the transport path 22 and passes the reading position P2, the image on the back side of the original is read by the CIS reading unit 28. Thereafter, the paper is discharged to the paper discharge tray 23.

  Here, the harness wiring disposed on the bottom surface portion 31 of the cover member 30 of the image reading apparatus 10 will be described. An insertion hole 40 is formed in the inner side surface 72 d of the guide rail 72 disposed on the back side in the carriage housing portion 33, and the harness wiring 45 disposed on the bottom surface portion 31 of the cover member 30 from the insertion hole 40. 46 comes out. The harness wirings 45 and 46 include electronic components such as a control base (not shown) installed below the chassis member 70 and the cover member 30, and the imaging unit 18 installed on the bottom surface 71 of the chassis member 70. This is a wiring component that is electrically connected to an electronic component such as the inverter device 19. A wiring protective cover 41 that is a synthetic resin member is attached to the insertion hole 40.

  FIG. 4 is a partially enlarged view showing the insertion hole 40 provided in the inner side surface 72 d of the guide rail 72 and the wiring protection cover 41 attached to the insertion hole 40. In FIG. 5 and the following FIG. 5, the harness wiring 46 is not shown. As shown in FIG. 4, the wiring protection cover 41 has a cylindrical shape formed to have an outer peripheral dimension slightly smaller than the inner peripheral dimension of the insertion hole 40 so as to cover the inner edge portion 40 a when inserted into the insertion hole 40. The main body part 42 and an eaves part 43 projecting in a direction along the side wall of the main body part 42 from a substantially upper half of one open end of the main body part 42 are integrally formed.

  The eaves portion 43 is formed in a plate shape that covers the upper portion of the harness wiring 45 that protrudes from the insertion hole 40 onto the bottom surface portion 31, and its both end portions follow the outer periphery of the insertion hole 40 toward the tip. Thus, the curved portions 43a and 43a are curved downward. The curved portions 43 a and 43 a are disposed on both ends of the eaves portion 43 in the extending direction of the power transmission members 56 and 57 when the wiring protection cover 41 is attached to the insertion hole 40. Further, the curved portions 43 a and 43 a are formed in a curved state so as to surround both sides of the harness wiring 45 protruding from the insertion hole 40 in a state where the wiring protection cover 41 is attached to the insertion hole 40. On the other hand, a strip-like snap-fit engagement piece 44 is formed at the other opening end (opening end inserted into the insertion hole 40) of the main body 42 of the wiring protection cover 41. The snap-fit engagement piece 44 is snap-engaged with an engagement portion (not shown) inside the guide rail 72 when the wiring protection cover 41 is attached to the insertion hole 40, so that the wiring protection cover 41 is inserted into the insertion hole 40. It is for fixing so as not to easily come off.

  FIG. 5 is a view showing a state in which the wiring protection cover 41 is attached to the insertion hole 40. As shown in the figure, the power transmission members 56 and 57 of the carriage drive mechanism 50 are stretched above the harness wiring 45 extending from the insertion hole 40. The eaves portion 43 of the wiring protection cover 41 attached to the insertion hole 40 extends between the harness wiring 45 and the power transmission members 56 and 57 so as to cover the upper side of the harness wiring 45. . As a result, when the harness wiring 45 coming out from the insertion hole 40 is bent due to a poor arrangement during assembly or maintenance, or the power transmission members 56 and 57 are bent due to an impact during driving. Even in the state, the eaves portion 43 can prevent the harness wiring 45 and the power transmission members 56 and 57 from contacting each other. Accordingly, it is possible to prevent the harness wiring 45 and the power transmission members 56 and 57 from coming into contact with each other to prevent adverse effects on the operations of the full rate carriage 12 and the half rate carriage 15, and to prevent a reduction in image reading accuracy.

  In addition, both end portions of the eaves portion 43 in the extending direction of the power transmission members 56 and 57 are bent to the curved portions 43 a and 43 a formed so as to surround both sides of the harness wiring 45 protruding from the insertion hole 40. Therefore, it is possible to prevent the harness wiring 45 that has been lifted from being exposed to the power transmission members 56 and 57 from both side ends of the eaves portion 43, so that the power transmission member 56 that is running above the eaves portion 43, It is possible to effectively prevent the harness wiring 45 from coming into contact with 57. Even when the power transmission members 56 and 57 are bent and come into contact with the eaves portion 43, the power transmission members 56 and 57 are not caught by the eaves portion 43.

  Also, as shown in FIG. 4, since the inner edge portion 40a of the insertion hole 40 is covered with the main body portion 42 of the wiring protection cover 41, even when a raw sharp sheet metal cut surface is exposed on the inner edge portion 40a. Since there is no possibility that the harness wiring 45 comes into contact with the cut surface, the harness wiring 45 can be prevented from being damaged. In addition, since the wiring protection cover 41 is directly attached to the chassis member 70 made of sheet metal, even when the harness wiring 45 and the power transmission members 56 and 57 come into contact with the eaves portion 43, the eaves portion 43 may be displaced from the position. There is little risk of damage, and it has sufficient impact strength. Further, since the wiring protection cover 41 is inserted into the insertion hole 40 and mounted, the wiring protection cover 41 can be easily attached. In particular, since it is fixed by the snap-fit engagement piece 44 when inserted into the insertion hole 40, it can be easily attached without using a tool or the like.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims, the specification, and the drawings. Is possible. It should be noted that any shape, structure, and material not directly described in the specification and drawings are within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. For example, the specific shape and position of the insertion hole 40 formed in the chassis member 70 are not limited to the shape and position shown in the above embodiment. Therefore, the insertion hole 40 has a guide rail 72 as long as the eaves portion 43 of the wiring protection cover 41 attached to the insertion hole 40 extends at a position between the power transmission members 56 and 57 and the harness wiring 45. It may be formed at a position other than the inner side surface 72d.

  Further, the specific shape of the wiring protection cover 41 is not limited to that shown in the above embodiment. That is, the wiring protective cover of the present invention protrudes from the main body portion so as to extend between the cylindrical main body portion covering the inner edge portion of the insertion hole and the harness wiring and the power transmission member protruding from the insertion hole. The specific shape of the main body portion and the eaves portion may be other shapes as long as the eave portion is provided. The configuration of the image reading apparatus 10 shown in the above embodiment is an example, and other configurations can be adopted as appropriate. For example, the full-rate carriage 12 and the half-rate carriage 15 are not limited to those equipped with the light source lamp 13 and the reflection mirrors 14, 17, and 17 as in the above embodiment. A device equipped with a lamp and an imaging unit may be used.

1 is a perspective view illustrating an overall configuration of an image forming apparatus including an image reading apparatus according to an embodiment of the present invention. 2 is a side cross-sectional view illustrating configurations of an image reading device and an automatic paper feeder. FIG. 1 is a schematic plan view showing a configuration of an image reading apparatus. It is a perspective view which shows the penetration hole provided in the side part of the guide rail integrally formed in the chassis member, and the wiring protection cover with which this penetration hole is mounted | worn. It is a perspective view which shows the state which mounted | wore the wiring protective cover in the insertion hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10 Image reading apparatus 12 Full-rate carriage 15 Half-rate carriage 18 Imaging unit 19 Inverter apparatus 20 Automatic paper feeder 30 Cover member 33 Carriage storage part 35 Upper cover 36 Platen glass 40 Insertion hole 40a Inner edge part 41 Wiring protection cover 42 Main body portion 43 Eave portion 43a Bending portion 44 Snap fit engagement piece 45 Harness wiring 46 Harness wiring 50 Carriage drive mechanism 56 Power transmission member 57 Power transmission member 60 Drive motor 70 Chassis member 71 Bottom surface portion 72 Guide rail 72d Inner side surface

Claims (4)

A sheet metal chassis member, a carriage that is movably supported along a guide rail installed on the chassis member, reads and scans an image of a document on a platen glass, and power that transmits power of a drive motor to the carriage In the image reading apparatus provided with the transmission member and the harness wiring arranged out of the insertion hole provided in the chassis member,
A cylindrical main body portion that is inserted into the insertion hole and covers an inner edge portion thereof, and an eaves portion that protrudes from the main body portion so as to extend between the harness wiring extending from the insertion hole and the power transmission member An image reading apparatus, wherein a wiring protective cover made of synthetic resin formed integrally is mounted in the insertion hole. The image reading apparatus according to claim 1,
The guide rail protrudes from the upper surface of the chassis member and is integrally formed with the chassis member, and the insertion hole is formed in the side surface portion of the guide rail, and the harness wiring extending from the insertion hole An image reading apparatus, wherein the power transmission member is stretched upward. The image reading apparatus according to claim 2,
The eaves portion of the wiring protection cover is formed in a plate shape that covers the upper side of the harness wiring coming out of the insertion hole. The image reading apparatus according to claim 3.
An image reading apparatus characterized in that both end portions of the eaves portion in the extending direction of the power transmission member are curved portions that are curved so as to surround both side portions of the harness wiring coming out of the insertion hole.

Images