JP5435216B2 - Image reading device - Google Patents

Description

  The present invention relates to an image reading apparatus applied to a copying machine, a scanner, a facsimile, and the like.

  This type of image reading apparatus is configured to read an original image on a platen glass by using a reading unit, and an automatic document feeder (ADF) provided on a platen cover to convey the original. However, there is a form of reading by the reading unit. An image reading apparatus having these two forms can be found in, for example, Patent Document 1. In this case, a single platen glass disposed on the upper surface of the document placing table covers the reading position of the transported document and the entire reading area of the placed document. On the upper surface of the glass at the reading position of the transported document, a wedge-shaped cross-section guide body that guides the document transported by the automatic document transport device in the reverse direction is fixed. Can be placed.

  Some image reading apparatuses cover the upper surface of the reading position of the conveyed document with a contact glass separate from the platen glass (Patent Document 2). In this case, the above-mentioned guide body is arranged between the platen glass and the contact glass, and both the plate glasses are divided by the guide body. In many cases, the support frame that supports the contact glass is formed of a plastic molded product, and the previous guide body is integrally formed on one side of the upper surface thereof.

Japanese Patent Laying-Open No. 2005-57534 (paragraph number 0011, FIG. 1) JP 09-171274 A (paragraph number 0010, FIG. 1)

  For example, in a copier, a basic specification that has only a function for reading a placed document and a specification that adds a reading function for a transported document to the basic specification are available. Can be selected. In order to cope with such a situation, manufacturers provide a platen cover that simply covers the upper surface of the platen glass and a platen cover that incorporates an automatic document feeder. In addition, the reading unit is configured to handle both placed documents and conveyed documents, and the upper surface of the reading position of the conveyed document is covered with contact glass, and the image reading apparatus is applied to both specifications in common. I can do it.

  As described above, if the reading unit is shared and the upper surface of the reading position of the conveyed document is covered with the contact glass, the basic specifications and the function-added specifications can be used in common to reduce the overall cost of the image reading apparatus. . However, in the basic specification model, the contact glass and the guide body are only useless, increasing the wasteful cost burden. Further, since the guide body having a wedge-shaped cross section protrudes along the home position of the platen glass, a part of the book (original) placed on the upper surface of the platen glass is received by the guide body, and the page to be read is read. There are cases where it cannot be held securely. Furthermore, since the guide body protrudes in a state where the platen cover is released, the appearance impression is likely to be impaired.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an image reading apparatus capable of optimizing the structure of a document placing table by using a model having a basic specification and a model having a function added, thereby realizing cost reduction and improved usability. .

An image reading apparatus according to the present invention includes:
A reading unit that is disposed inside the document placing table and reads an image of the placed document and the conveyed document;
A mounting table cover that has a main opening that defines a placement area for the document to be placed, and a mounting opening that opens toward the image reading position of the transported document, and covers the upper surface of the document table;
A platen glass disposed on the upper surface of the document table, the periphery of which is held by the table cover;
With
The platen glass is arranged so as to face the placement area of the placed document and not to reach the image reading position of the transported document,
Either one of the decorative cover that closes the mounting opening and the window unit including the contact glass is arranged inside the document placing table according to the difference in the specifications of the image reading function, and opens in the opening space of the mounting opening. It is attached to the upper surface of the facing frame ,
The window unit includes the contact glass facing the image reading position, and a support frame that supports the contact glass .

  A mounting seat is provided on the upper surface of the frame facing the mounting opening, and either the decorative cover or the window unit is mounted on the mounting seat according to the difference in the specifications of the image reading function.

  Each of the decorative cover and the window unit is provided with a positioning portion that serves as a position reference when the placed document is placed on the platen glass. A shading sheet is disposed on the positioning portion.

  In a state where the decorative cover is mounted on the mounting seat, the upper surface of the decorative cover and the upper surface of the mounting table cover are flush with each other.

The upper surface of the supporting lifting frame, provided a guide member and a positioning portion for upwardly guiding the fed-document.

Either one of a platen cover that does not include an automatic document conveyance unit and a platen cover that includes an automatic document conveyance unit can be mounted on the document table, and the upper surface of the frame includes the decorative cover, When any one of the window units including the contact glass can be mounted, and the model of the function addition specification is capable of both reading the image of the placed document and reading the image of the transported document, the automatic When the platen cover including the document conveying unit and the window unit including the contact glass are mounted, and the basic specification model is capable of only reading the image of the original document, the automatic document conveying unit is A platen cover that is not provided and the decorative cover are configured to be attached .

  In the image reading apparatus of the present invention, a main opening and a mounting opening are provided in the mounting table cover of the document mounting table so that either the decorative cover or the window unit can be mounted on the frame facing the mounting opening. Specifically, when the image reading apparatus has a basic specification that only reads a placed document, the decorative cover is fixed to the frame and the attachment opening is closed with the decorative cover. In addition, in the case of a function-added specification that reads a transported document in addition to the placed document, a window unit is fixed to the frame instead of the decorative cover so that the image of the transported document can be read through the window unit. did.

  According to the image reading apparatus of the present invention configured as described above, the basic specification model and the function-added specification model share the reading unit to save cost, and the basic specification model covers the mounting opening. It is possible to optimize the structure of the document table by eliminating the waste of the structure. As a result, it is possible to reduce the cost of the basic specification model by omitting the window unit including the contact glass, and to eliminate the extra cost burden imposed on the user of the same model. In addition, when reading the image of the original placed on the platen glass, the page to be read can be brought into close contact with the platen glass without being disturbed by protrusions. Usability can be improved.

  If each of the decorative cover and the window unit is provided with a positioning portion, the positioning when placing the placed document on the platen glass can be performed by the positioning portion. The structure of the table can be optimized.

  When a positioning part is provided in each of the decorative cover and the window unit, and the shading sheet is arranged in the positioning part, it is possible to easily replace the deteriorated shading sheet with the effort of removing the decorative cover or the window unit. . By the way, in the conventional document table, the shading sheet cannot be replaced unless all the presser frames that hold the periphery of the platen glass are removed, and much labor is required for the replacement work. It was.

  According to the image reading apparatus in which the upper surface of the decorative cover and the upper surface of the mounting table cover are flush with the decorative cover mounted on the mounting seat, the entire upper surface of the document mounting table is flattened in the basic specification model. The appearance can be refreshed. Furthermore, the document can be prevented from being caught as much as there are no obstacles such as protrusions.

  According to the window unit in which the window unit is constituted by the contact glass and the support frame, and the guide body and the positioning portion of the conveyed document are provided on the upper surface of the support frame, the glass support and the conveyed document are formed by only one support frame. The guide and the positioning function of the placed document can be exhibited at the same time. Accordingly, it is possible to optimize the structure of the document placing table at the same time while simplifying the structure of the document placing table in the function-added specification model.

  Depending on the difference between the basic specification model and the function-added specification model, the image reader that replaces the decorative cover and platen cover, and the window unit and platen cover reduces the number of dedicated parts provided for each model. However, the structure of the document table can be optimized. Even after a new image reading apparatus is introduced, the specification can be easily changed by simply replacing the previous replacement parts, and the image reading apparatus can be adapted to changes in the user's usage. .

It is a top view which shows the combination structure of the document mounting base concerning this invention. It is a front view of a multifunction machine showing an application example of an image reading apparatus. FIG. 3 is a plan view of an image reading unit in a state where a document table is separated. It is the sectional view on the AA line in FIG. It is a principle explanatory view showing a schematic structure of an automatic document feeder. It is a perspective view which shows the upper surface structure and lower surface structure of a window unit. It is a top view of the state which attached the window unit to the attachment opening. It is the BB sectional view taken on the line in FIG. It is a perspective view which shows the upper surface structure and lower surface structure of a decorative cover. It is a top view of the state which attached the decorative cover to the attachment opening. It is CC sectional view taken on the line in FIG.

  FIG. 1 to FIG. 11 show an embodiment in which the image reading apparatus according to the present invention is applied to a multifunction machine having a copy function and a facsimile function. In the present invention, “front / rear”, “left / right”, and “up / down” follow the cross arrows shown in FIGS.

  In FIG. 2, the multifunction machine includes a recording unit 1 and an image reading unit (image reading device) 2 disposed above the recording unit 1. The recording unit 1 is provided with an image recording device 3 and a fixing device 4. A platen cover 5 for opening and closing the document reading surface is provided on the upper surface of the image reading unit 2, and an automatic document feeder (ADF) 6 is incorporated in the upper part thereof. An operation panel 7 is provided on the front surface of the image reading unit 2. Below the recording unit 1, paper feed cassettes 8 are arranged in multiple stages, and each paper feed cassette 8 contains sheets of different sizes. The paper on which the image is printed via the image recording device 3 and the fixing device 4 is discharged to the paper discharge unit 9 below the image reading unit 2. The platen cover 5 swings up and down around a hinge provided at the rear end thereof, thereby covering the upper surface of the document table 12 or opening the upper surface of the document table 12.

  3 and 4, the image reading unit 2 has a document table 12 whose upper surface is covered with a platen glass 11, a reading unit 13, a carriage 14 that supports the optical system of the unit 13, and a CCD An image sensor 15 and the like are arranged. The document table 12 includes a housing 16 that occupies the lower half, a table cover 17 and a rear cover 18 that are fixed to the upper surface of the housing 16, the platen glass 11, and the like. A carriage 14, a driving device for driving the carriage 14, and the like are assembled to the front and rear frames of a rectangular frame-shaped sheet metal frame 19 disposed inside the document table 12.

  As shown in FIG. 4, the carriage 14 includes a first carriage 22 and a second carriage 23. Both the first and second carriages 22 and 23 have a frame-like structure that is long in the front-rear direction, and their front and rear ends are guided by the front and rear frames of the frame 19 so as to be reciprocally slidable. The second carriage 23 is provided with a light source 24 for irradiating a document and a first mirror 25. A second mirror 26 and a third mirror 27 are arranged on the first carriage 22. The image redirected by the third mirror 27 is sent to the lens unit of the CCD image sensor 15. The reading unit 13 includes a light source 24, first to third mirrors 25 to 27, a CCD image sensor 15, and the like. The optical system components excluding the CCD image sensor 15 are both first and second. Arranged on the carriages 22 and 23.

  The carriage drive device includes a first drive system 31 and a second drive system 32 provided corresponding to the first and second carriages 22 and 23. Each of the first and second drive systems 31 and 32 is configured as a wound transmission structure using a belt as a transmission medium. By driving the drive shaft 33 on the right end side in FIG. 4 through gears with the power of the motor 34, the drive systems 31 and 32 can be simultaneously driven. The first and second carriages 22 and 23 are connected to the straight portions of the belts of the drive systems 31 and 32 and can reciprocate between the left and right pulleys. The second carriage 23 when reciprocating is the first carriage 22. Move twice as fast.

In FIG. 5, the automatic document conveyance unit 6 is disposed along a horizontal U-shaped conveyance path 39 provided between an upper document tray 37 and a lower discharge tray 38 and a conveyance path 39. A paper roller 40, a group of transport rollers 41, a paper discharge roller 42, and the like are included. A presser frame 43 that presses the document downward is disposed on the lower surface side of the reversing portion of the conveyance path 39. Due to the presser frame 43, the document is pushed down by a spring.

  The mounting table cover 17 is formed of a box-shaped plastic molded product having an opening on the lower surface and the rear surface, and is opened on the upper surface so as to face the image reading position of the conveyed document and a main opening 45 that defines a placement area for the document to be mounted. The mounting opening 46 is formed in a state adjacent to the left and right (see FIG. 3). The front-rear width of the mounting opening 46 is set slightly larger than the front-rear width of the main opening 45, and a stepped portion 47 for receiving the window unit 50 is formed on the inner periphery excluding the inner edge on the main opening 45 side.

  By pressing the front and rear edges and the right edge of the platen glass 11 placed on the upper end surface of the frame 19 with a pressing wall 48 (see FIG. 4) provided along the main opening 45, the platen glass 11 is placed on the frame 19 and the placing table. The cover 17 can be pinched and fixed inside and outside. A mounting seat 49 for fixing the window unit 50 is provided on the upper surface of the frame 19 facing the opening space of the mounting opening 46 (see FIG. 1). Although not shown, the mounting table cover 17 is fixed to the frame 19 by fastening the front and rear of the left and right side surfaces with screws.

  As shown in FIG. 6, the window unit 50 includes a contact glass 51 and a support frame 52 that supports the glass 51. The support frame 52 is made of a plate-like plastic molded product that is long in the front and rear, and a loading seat 53 for fitting the contact glass 51 into the plate surface is recessed. On the upper surface of the support frame 52, a guide body 54 for guiding the conveyed document upward and a positioning portion 55 are integrally formed. The guide body 54 has a wedge-shaped cross section and protrudes upward continuously from the upper opening edge of the loading seat 53 on the platen glass 11 side.

  As shown in FIGS. 7 and 8, the positioning portion 55 in a state in which the window unit 50 is mounted in the mounting opening 46 covers the upper surface of the left side edge of the platen glass 11, and the side edge of the document is covered by the right end surface thereof. Receiving and positioning the document. That is, the positioning unit 55 functions as a position reference when placing the placed document on the platen glass 11. A sheet groove 56 is formed in the lower surface of the positioning portion 55, and a white shading sheet 57 is attached to the inside. The shading sheet 57 adjusts the white balance in the reading unit 13.

  Positioning pins (positioning protrusions) 60 and fastening bosses 61 are provided on the inner surfaces of the front end and the rear end of the support frame 52. As shown in FIG. 1, the mounting seat 49 has a positioning hole 62 corresponding to the positioning pin 60, a screw hole 63 corresponding to the fastening boss 61, and a rectangular engagement hole 64 corresponding to a connecting claw 76 described later. And are formed. In order to facilitate the assembly of the support frame 52 to the mounting seat 49, the front positioning hole 62 is formed in a notch shape.

  The window unit 50 can be positioned with respect to the mounting seat 49 by inserting the front positioning pin 60 into the notch-shaped positioning hole 62 and fitting the rear positioning pin 60 into the round hole-shaped positioning hole 62. In this state, by screwing screws (bolts) 65 inserted through the front and rear fastening bosses 61 into the screw holes 63, the window unit 50 can be fixed to the frame 19, and the entire mounting opening 46 can be closed with the support frame 52. it can.

  In the window unit 50 fixed to the frame 19 as described above, the lower surface of the loading seat 53 and the fastening boss 61 is received by the frame 19. Further, as shown in FIG. 8, the window unit 50 is positioned directly below the presser frame 43 of the automatic document feeder 6. Therefore, as shown by the solid line in FIG. 4, the image of the document conveyed along the upper surface of the window unit 50 is read by positioning the second carriage 23 at the conveyed document reading position directly below the contact glass 51. be able to. When reading an image of a placed document, scanning is started with the second carriage 23 positioned at a placed document reading position indicated by an imaginary line in FIG.

  The multi-function machine configured as described above is a model with a function addition specification capable of both reading a placed original and reading a transported original. When this multi-function machine is a model with basic specifications that can only read a placed document, a platen cover 70 that does not include the automatic document feeder 6 is assembled to the document placing table 12 as shown in FIG. The decorative cover 71 is fixed to the mounting seat 49 to close the mounting opening 46.

  As shown in FIGS. 9 to 11, the decorative cover 71 is made of a plate-shaped plastic molded product that is long in the front-rear direction, and a positioning portion 72 is provided along the side edge on the platen glass 11 side. The positioning unit 72 functions as a position reference when the placed document is placed on the platen glass 11 by receiving the side edge of the document at the right end surface thereof. A sheet groove 73 similar to that of the previous support frame 52 is formed in the lower surface of the positioning portion 72, and a white shading sheet 74 is affixed therein. On the inner surfaces of the front and rear ends of the decorative cover 71, positioning pins (positioning protrusions) 75, connecting claws 76 that are inserted and engaged with the engaging holes 64 of the mounting seat 49, and fastening bosses 77 are provided. . The connecting claw 76 includes a claw arm that can be elastically deformed in the front-rear direction.

  In the decorative cover 71, the front and rear positioning pins 75 are fitted into the positioning holes 62, and the whole is pushed in in this state to engage the connecting claws 76 with the engaging holes 64. Further, by screwing screws (bolts) 65 inserted through the front and rear fastening bosses 77 into the screw holes 63, the decorative cover 71 can be fixed to the frame 19 and the entire mounting opening 46 can be closed. The upper surface of the decorative cover 71 in this state is flush with the upper surface of the mounting table cover 17 as shown in FIG. Therefore, even when an image is read in a state where the original document is placed on the upper surface of the platen glass 11, the original document can be held and held by the platen cover 70 in a state where the read target page is in close contact with the platen glass 11. Further, since the entire upper surface of the mounting table cover 17 and the decorative cover 71 surrounding the platen glass 11 is flattened, the impression of the appearance of the document mounting table 12 can be made clear. Since there are no obstacles, it can contribute to prevention of document catching.

  In addition to the above embodiments, the shading sheets 57 and 74 can be provided on the upper surface side of the positioning portions 55 and 72. In that case, a light projection window is formed in the positioning portions 55 and 72, and the shading sheets 57 and 74 are arranged in the positioning portions 55 and 72 in a state in which the upper opening of the light projection window is closed. The decorative cover 71 can be fastened to the frame 19 with screws 65 in the same manner as the support frame 52 of the window unit 50.

5 Platen Cover 6 Automatic Document Conveying Section 11 Platen Glass 12 Document Placement Table 13 Reading Unit 17 Placement Table Cover 19 Frame 45 Main Opening 46 Mounting Opening 49 Mounting Seat 50 Window Unit 51 Contact Glass 52 Support Frame 54 Guide Body 70 Platen Cover 71 Makeup cover

Claims (7)

A reading unit that is disposed inside the document placing table and reads an image of the placed document and the conveyed document;
A mounting table cover that has a main opening that defines a mounting region for the document to be placed and a mounting opening that opens toward the image reading position of the transported document, and covers the upper surface of the document mounting table;
A platen glass disposed on the upper surface of the document table, the periphery of which is held by the table cover;
With
The platen glass is arranged so as to face the placement area of the placed document and not to reach the image reading position of the transported document,
A decorative cover for closing the mounting opening, either the window unit including the contact glass, in accordance with the difference of the specifications of the image reading function, the open space of the arrangement has been the mounting opening to the inside of the document placing table It is attached to the upper surface of the facing frame ,
The image reading apparatus, wherein the window unit includes the contact glass facing the image reading position, and a support frame that supports the contact glass . A mounting seat is provided on the upper surface of the frame facing the mounting opening,
The image reading apparatus according to claim 1, wherein one of the decorative cover and the window unit is attached to the mounting seat according to a difference in specifications of the image reading function.   The image reading apparatus according to claim 1, wherein each of the decorative cover and the window unit is provided with a positioning portion that serves as a position reference when placing the placed document on the platen glass.   The image reading apparatus according to claim 3, wherein a shading sheet is disposed in the positioning portion.   The image reading apparatus according to claim 2, wherein an upper surface of the decorative cover and an upper surface of the mounting table cover are flush with each other when the decorative cover is mounted on the mounting seat. Before SL on the upper surface of the support frame, a guide member for upwardly guiding the transport document, the image reading apparatus according to claim 3, wherein said positioning portion is provided. Either one of a platen cover that does not include an automatic document conveyance unit and a platen cover that includes an automatic document conveyance unit can be mounted on the document table .
On the upper surface of the frame, either the decorative cover and the window unit including the contact glass can be attached,
In the case of a model with a function-added specification capable of both reading the image of the original document and reading the image of the transported document, the window including the platen cover including the automatic document transport unit and the contact glass Unit is attached,
According to the case of the type of read only possible basic specifications of the image of the placement document includes a platen cover not provided with the automatic document feeder, that is configured such that the the decorative cover is attached Item 7. The image reading apparatus according to any one of Items 1 to 6.

Images