JP5469387B2 - Document conveying apparatus and image processing apparatus - Google Patents

Description

The present invention relates to a document conveying apparatus and an image processing apparatus including a driving motor for driving a rotating body such as a conveying roller in a scanner, a facsimile machine, a copier, a printer, a multifunction machine, and the like.

When a servo motor is used as a drive motor for this type of document conveying device, generally, a slit encoder that rotates integrally with the motor is read by an optical sensor, and based on the read information, motor control and sheet control are performed by a control unit. The transport position is detected.

  By the way, a slit type encoder has a plurality of fine holes (slits) formed in the rotation direction by an etching method or the like. For this reason, when shavings or dust entering from the rotating body side or the outside adheres to the slit and the slit is closed, the control unit detects the sheet conveyance position and the like based on information read by the optical sensor. In some cases, false detection may occur.

  Therefore, a motor encoder in which the slit plate is covered with a case has been proposed (Patent Document 1).

JP-A-5-296789

  However, in the motor encoder in which the slit plate is covered with the case as in the conventional case, since the motor unit itself becomes large depending on the case, it is difficult to effectively use the space, which causes the size reduction of the rotating body driving device. . In addition, when attaching a case to a motor, since the components etc. for attaching this case to a motor other than a case are needed, weight reduction and cost reduction become difficult.

The present invention, while securing the dust resistance of the reading plate, it is possible to reduce the size of the apparatus, the document feeder and can achieve weight reduction and cost reduction by reducing the number of parts An object is to provide an image processing apparatus.

In order to achieve the above object, the present invention is an original conveying apparatus, which drives an original tray for placing an original, conveying means for conveying an original along a conveying path, and a rotating body of the conveying means. Rotating body driving means having a reading plate that is provided in the driving means and detects rotation information of the rotator that is driven by the driving means; and a housing of the apparatus main body that houses the rotating body driving means. And a dust-proof space is defined as a space surrounding at least the read plate by a member forming a housing of the apparatus main body, and the document tray has one end of the conveyance path at an upper end portion of the apparatus main body. The side of the transport path is inclined with respect to the opening, the upstream side in the transport direction of the transport path is tilted along the connection direction of the document tray, and the dust-proof space is connected to the paper feed tray. Lower upper end of the device body at the portion where one end is opened in the A and and the conveying path between the upstream side of the portion of the serial transport path is a bottom side of the apparatus main body which faces the portion inclined It is provided in the side end part.

  According to the present invention, it is possible to reduce the size of the apparatus while ensuring the dustproofness of the reading plate, and it is possible to reduce the number of parts and achieve weight reduction and cost reduction.

It is a schematic sectional drawing for demonstrating an image reading apparatus provided with the rotary body drive device which is an example of embodiment of this invention. It is the disassembled perspective view which looked at the main body housing of the image reading apparatus shown in FIG. 1 from the bottom face side. It is the top view seen from the bottom face for demonstrating the internal structure of the image reading apparatus shown in FIG.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view for explaining an image reading apparatus including a rotating body driving device that is an example of an embodiment of the present invention.

  In the image reading apparatus 10 shown in FIG. 1, a paper feed tray 12 on which a document (sheet) S is stacked is supported so as to be openable and closable with respect to the apparatus main body housing 10A. The paper feed tray 12 covers the paper feed port of the original S in the closed state, and the original S is stacked in the open state (the state shown in FIG. 1).

  Further, the apparatus main body housing 10A accommodates a lower frame 107 and an upper frame 108 supported to be openable and closable with respect to the lower frame 107.

  In the lower frame 107, a feeding roller 14, a conveying roller 16, a reading sensor 18, and a conveying roller 20 are sequentially arranged toward the downstream side in the document conveying direction, and the roller shafts of the rollers 14, 16, and 20 The frame 107 is rotatably supported.

  The lower frame 107 is provided with a driving motor (driving means) 113 and a control board 114 that transmit driving force to the roller shafts of the rollers 14, 16, and 20 via a gear mechanism 115 (see FIG. 2). Yes.

  In the present embodiment, for example, the drive motor 113 has drive shafts protruding at both ends in the axial direction, and an encoder (read plate) 113a (see FIG. 3) is attached to the end of one drive shaft. Although not shown, the encoder 113a is a slit-type encoder having a plurality of fine holes (slits) formed in the rotation direction and rotating integrally with the motor 113. In the present embodiment, the driving motor 113 having the above-described plate to be read is used as an example of a rotating body driving unit.

  An optical sensor 113b (see FIG. 3) for reading a slit of the encoder 113a when the drive motor 113 rotates is attached to an end surface of the drive motor 113 on the encoder 113a side via a plate-like bracket 113c.

  Based on the rotation information of the encoder 113a read by the optical sensor 113b, the control unit mounted on the control board 114 performs drive control of the motor 113, detection of the sheet conveyance position, and the like.

  On the other hand, the upper frame 108 includes a separation roller 15 that forms a roller pair with the feeding roller 14, a conveyance roller 17 that forms a conveyance roller 16 and a conveyance roller pair, and a conveyance roller that forms a conveyance roller 20 and a discharge roller pair. 21 is arranged.

  The roller shafts of the rollers 15, 17, and 21 are rotatably supported by the upper frame 108, and a reading sensor 19 is disposed between the conveying roller 17 and the conveying roller 21 so as to face the reading sensor 18. ing.

  The plurality of documents S stacked on the sheet feeding tray 12 are separated and fed one by one from the lowermost document to the conveyance path by the feeding roller 14 and the separation roller 15 and fed to the conveyance path. The document S is transported downstream by transport roller pairs 16 and 17.

  The original S transported downstream in the transport path is scanned on the front and back images by the reading sensors 18 and 19, and is then discharged out of the apparatus by the discharge roller pairs 20 and 21.

  The reading operation of the original image by the reading sensors 18 and 19 is performed by the controller of the control board 114 between the feed amount of the original S conveyed by the conveying roller pairs 16 and 17 and the reading signal of the encoder 113a by the optical sensor 113b. It is done accurately by synchronizing.

  The image data read by the reading sensors 18 and 19 is transferred to an external device (not shown) via a communication I / F mounted on the control board 114.

  2 is an exploded perspective view of the apparatus main body housing 10A of the image reading apparatus 10 shown in FIG. 1 as viewed from the bottom side, and FIG. 3 is viewed from the bottom side for explaining the internal structure of the image reading apparatus 10 shown in FIG. It is a top view.

  Here, in the present embodiment, each part constituting the image reading apparatus 10 described above is accommodated in the apparatus main body housing 10A. In the present embodiment, as shown in FIG. 2, the apparatus main body housing 10A is divided into a plurality of divided bodies (members forming the apparatus main body housing 10A). Specifically, the apparatus main body housing 10A is divided into side plates 109a and 109b, a roller housing 110, a back plate 111, and a bottom plate 112, respectively. Note that the apparatus main body housing 10 </ b> A substantially includes constituent members such as outer shells such as side plates 107 and 107 a on the side facing the back plate 111, members that cover internal functional units, and the like.

  The side plates 109a and 109b engage with the lower frame 107 on both sides in the axial direction of the conveying roller pairs 16, 17 and the like. Further, the back plate 111 forms a wall portion on the upstream side in the document transport direction of the apparatus main body housing 10A.

  At the corner (corner) between the side plate 109a and the back plate 111 of the side plates 109a and 109b, the back plate 111 is placed in a state where the drive motor 113 has its axis substantially parallel to the axis of the conveying roller pair 16, 17, etc. It is arranged along the inner wall surface.

  The drive shaft opposite to the drive shaft to which the encoder 113a of the drive motor 113 is attached protrudes from the side plate 107a of the lower frame 107 toward the side plate 109a of the apparatus main body housing 10A, and a drive gear 113d is provided at the protruding end. It is fixed.

  Then, the driving force of the driving motor 113 is transmitted to the roller shafts of the feeding roller 14 and the conveying rollers 16 and 17 protruding from the side plate 107a of the lower frame 107 through the gear mechanism 115 including the driving gear 113d.

  The roller housing 110 is a member that partitions between the feeding roller 14 and the conveying rollers 16 and 20 and the drive motor 113, and is disposed along the axial direction of the roller shaft.

  A protruding portion 110a that extends to the front of the back plate 111 is formed at a substantially central portion in the axial direction of the roller housing 110, and a protruding portion 110c that reaches the back plate 111 is formed at the front end surface of the protruding portion 110a. Has been.

  The projecting portion 110c is disposed on a side farther from the bottom plate 112 than the surface of the projecting portion 110a facing the bottom plate 112, and on the side plate 109a side of the projecting portion 110a, a step surface having substantially the same level as the projecting portion 110c. 110e is formed.

  Further, an extended portion 110b extending to the side plate 107a of the lower frame 107 is formed on the side surface on the downstream side in the document transport direction from the step surface 110e of the overhang portion 110a.

  A relief groove 110d for escaping the bracket 113c of the optical sensor 113b attached to the motor body of the drive motor 113 is formed in the extended portion 110b.

  Then, as shown in FIG. 2, the back plate 111 and the side plates 109a and 109b are attached to the lower frame 107 in the directions of arrows A and B, respectively, and the roller housing 110 and the bottom plate 112 are attached in the directions of arrows C and D, respectively. Attach to. Thereby, apparatus main body housing 10A is assembled.

  In such an assembled state, the roller housing 110 partitions the rollers 14, 16, 20 and the drive motor 113, and the side plates 109a, 109b, the back plate 111, and the bottom plate 112 provide a space between the drive motor 113 and the outside. Is partitioned. Thereby, a dust-proof space that is a space surrounding the encoder 113a attached to the drive motor 113 is defined. That is, the dust-proof structure of the encoder 113a attached to the drive motor 113 is formed by the members that form the apparatus main body housing 10A.

  Here, the control board 114 is disposed on the protrusion 110c and the stepped surface 110e of the roller housing 110, and the mount 114a mounted on the control board 114 is formed in the dust-proof space E formed on the side plate 109a side of the protrusion 110c. (See FIG. 3).

  As described above, in the present embodiment, the roller housing 110 partitions the rollers 14, 16, 20 and the drive motor 113. Thereby, it is possible to prevent dust such as paper dust and dust adhering to each of the rollers 14, 16 and 20 from entering the drive motor 113 side. Further, since the roller shafts of the rollers 14, 16, and 20 protrude from the side plate 107a of the lower frame 107, it is possible to prevent dust and the like from entering the drive motor 113 side from the opening formed in the side plate 107a. .

  Further, since the drive motor 113 and the outside are partitioned by the side plates 109a and 109b, the back plate 111, and the bottom plate 112, it is possible to prevent dust and the like from entering the drive motor 113 from the outside. it can.

  Thus, in this embodiment, the dustproof property of the encoder 113a can be ensured. Thereby, it is not necessary to attach the case which covers the encoder 113a to the drive motor 113. That is, the dust-proof space is defined by the members forming the apparatus main body housing 10A, and the encoder 113a is disposed in the dust-proof space, while eliminating the need for a case such as a conventional motor encoder. Can be secured.

  In addition, since the conventional case is not required, space can be saved. As a result, the device can be reduced in size and the number of parts can be reduced to achieve weight reduction and cost reduction. can do.

  Further, in the present embodiment, the mount 114a mounted on the control board 114 can be disposed along the dust-proof space E formed on the side plate 109a side of the protrusion 110c. Thereby, the control board 114 can be brought close to the vicinity of the encoder 113a attached to the drive motor 113, and the space in the apparatus can be used effectively.

  The configuration of the present invention is not limited to that exemplified in the above embodiment, and the material, shape, dimensions, form, number, arrangement location, and the like can be changed as appropriate without departing from the scope of the present invention. It is.

<Other embodiments>
As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to one Embodiment mentioned above.

  For example, in the above-described embodiment, the case where the drive motor 113 is disposed at the corner of the apparatus main body housing 10A has been described, but the present invention is not limited to this.

  For example, a rotating body driving means such as a drive motor with an encoder may be disposed inside the apparatus main body housing. In this case, an internal wall is provided as the apparatus main body housing, and a dust-proof space is defined as a space surrounding a reading plate such as an encoder by the internal wall.

  As a result, the same effects as those of the above-described embodiment can be obtained, and the influence of dust or the like that is substantially mixed from the outside by the housing member that forms the outer shell of the apparatus can be further reduced.

  In the above-described embodiment, the slit plate is exemplified as the plate to be read. However, the present invention is not limited to this, and a shielding plate may be adopted as the plate to be read. The present invention broadly covers the entire reading plate. That is, the present invention can be applied to a reading plate such as a code plate having a predetermined code or a magnetic plate.

  In the above-described embodiment, the image reading apparatus has been described as an example. However, the present invention is of course not limited thereto, and can be applied to, for example, a document conveying apparatus (sheet conveying apparatus).

  That is, according to the present invention, in a document conveying device including an apparatus main body housing in which a rotating body driving unit having a reading plate attached to a driving unit is accommodated, at least a reading plate is surrounded by a member forming the apparatus main body housing. A dust-proof space may be defined as the space.

  As described above, even when the present invention is applied to the document conveying device, the same effect as that of the above-described embodiment can be obtained.

  The present invention is not limited to the above-described image reading apparatus. The document processing apparatus includes a document conveying device to which the rotating body driving device is applied and a document processing unit that performs predetermined processing on the document. It can also be applied to (image processing apparatus).

  Here, examples of the document processing apparatus include a printer, a facsimile, a check scanner such as a check or bill, a multifunction machine, and the like, but the present invention is not limited to these. In any case, a device body housing for mounting the drive means with the plate to be read is provided with a dustproof space for preventing dust and the like from adhering to the plate to be read such as a slit plate mounted on the drive means such as a motor. For example, the type of the apparatus is not particularly limited.

DESCRIPTION OF SYMBOLS 10 Image reader 10A Apparatus main body housing 14 Feed roller 16, 17 Conveyance roller pair 20, 21 Discharge roller pair 109 Side plate 110 Roller housing 111 Back plate 112 Bottom plate 113 Drive motor 113a Encoder 113b Optical sensor 114 Control board 114a Mounted object

Claims (5)

A document feeder,
A document tray for placing documents;
Conveying means for conveying the original along the conveying path;
A driving means for driving the rotating body of the conveying means, and a rotating body driving means provided on the driving means and having a reading plate for detecting rotation information of the rotating body driven by the driving means;
A housing of the apparatus main body for accommodating the rotating body driving means,
A dust-proof space is defined as a space surrounding at least the read plate by the member forming the housing of the apparatus main body,
The document tray is connected in an inclined state with respect to a portion where one end side of the transport path opens at the upper end of the apparatus main body, and the upstream side in the transport direction of the transport path is along the connection direction of the document tray. Tilt and
The dust-proof space is opposed to a portion where the upper end of the apparatus main body is inclined at a portion between the paper feed tray and the upstream portion of the transport path in the transport direction and where one end of the transport path is open. An original conveying apparatus provided in a lower end portion which is a bottom surface side of the apparatus main body.   The housing of the apparatus main body is divided into a plurality of divided bodies, and the dust-proof space partitions the divided body partitioning between the rotating body and the rotating body driving means, and the rotating body driving means and the outside. The document feeder according to claim 1, wherein the document feeder is defined by the divided body.   The rotary body driving means is disposed at a corner of the housing of the apparatus main body, and the member that defines the dust-proof space includes a member that forms an inner wall surface of the housing of the apparatus main body. The document conveying device according to 1.   The document feeder according to claim 1, wherein the plate to be read is an encoder having a plurality of slits formed in a rotation direction.   An image, comprising: a sheet conveying device serving as the document conveying device according to claim 1; and a processing unit configured to perform a predetermined process on a sheet conveyed by the sheet conveying device. Processing equipment.