JPH05147797A - Sheet discharge guide device of sheet transport type - Google Patents

Abstract

PURPOSE:To simply change over the forward/backward discharging direction of document sheets and provide smooth transportability for document sheet with eventual curling downward by equipping a movable guide plate with a document guide surface, a projection for changing the heading, and a detaining part for the leading edge of the sheet, and supporting this guide plate on the device body with possibility of swinging oscillatively. CONSTITUTION:Each document sheet 50 is fed from a table 30 installed ahead of the device body 2, inserted to between rollers 18, 32, and passed to a reading sensor 10. Further the document sheet 50 is sent onto sheet transport guides 14, 28 with rotation of rollers 20, 34 and discharged from the back of the device body 2. A movable guide plate 54 is swung oscillatively clockwise with a shaft 58 as the center and one end is detained with a detaining recess 60 to cause rising on the transport guide 28. Then the document sheet 50 gets on the guide plate 54 to make turning as directed ahead of the device body 2, so that the discharging direction can be switched simply. Even though the document sheet 50 is curling downward, its leading edge runs against the detaining part 54b of the guide plate 54 and is curved by the projection 54a, so that the sheet can be discharged ahead smoothly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-conveying scanner, and more specifically, a one-way document conveying path for dropping a document inserted from the front of the scanner body from the rear of the scanner body and a document from the rear side of the body. The present invention relates to a sheet ejection guide device capable of arbitrarily selecting one of a reverse return document conveyance path for guiding a return direction toward the front of the main body.

[0002]

2. Description of the Related Art Conventionally, in a sheet driving type scanner, there is known a one-way document feeding method in which a document sheet inserted from the front of the main body is read by a reading sensor in the main body and then discharged from the rear portion of the main body. After reading the original paper inserted from the front with the reading sensor inside the main body, the original is made a U-turn upward from the rear of the main body to the front of the main body, whereby the original is discharged to the front side of the main body. The scheme is known.

[0003]

With respect to the operability of the scanner, after reading the original paper inserted from the front of the main body,
The reverse document transport method that ejects paper to the front side of the main body is excellent, but if the document paper is much thicker than the standard size, or if it is a material such as aluminum-kent paper that does not return when bent, In this case, there is a problem that if the original document is bent by the guiding action of the guide plate in the U-turn direction when the original document returns to the front of the main body, this bending cannot be restored. Further, in the one-way document feeding method, the problem of bending of the document sheet does not occur, but there is a problem that the operability is not good because the document sheet is discharged out of the reach of the operator. The present invention is intended to solve the above problems.

[0004]

In order to achieve the above object, the present invention provides a reading surface on a reading sensor 10 by means of rollers 18, 20, 32, 34 for transporting a document in the main body 2 from the front of the main body 2. In a sheet-conveying scanner that conveys a document to the rear of the main body 2 and discharges the document from the rear to the outside, a guide surface that guides the document obliquely upward and a substantially intermediate position between the guide surfaces are provided. The convex portion 54a for converting the upward moving motion of the original document to the forward moving motion of the main body and the locking portion 54 for locking the leading end of the original document over the convex portion 54a.
A movable guide plate 54 having b and 54c is swingably supported by the main body 2 between a position for guiding the document and a position away from the guiding position.

[0005]

When the movable guide plate 54 is moved to the position for guiding the original, the original sent from the front side to the rear side of the main body 2 reaches the movable guide plate 54 and is guided by the movable guide plate 54 to be guided obliquely upward. It When this original document reaches the convex portion 54a of the movable guide plate 54, it is guided in the front discharge direction by the convex portion 54a.

When the document is curled downward and the document passes over the convex portion 54a, the leading end of the document is locked by the locking portions 54b and 54c, and in this state the document is still movable. As it goes along, the portion near the leading edge of the document bends toward the front of the main body 2. When the curved portion becomes large, the leading edge of the document is disengaged from the locking portions 54b and 54c due to the weight of the curved portion, and the portion near the leading edge of the document falls to the front portion of the main body 2 and is discharged to the front of the main body 2. Move in the direction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. Reference numeral 2 denotes a main body of the sheet conveyance type scanner, which is composed of a base 4 and an upper cover 8 pivotally supported on the base 4. A reading sensor 10 is arranged substantially in the center of the base 4, and the sensor 10 is connected to a controller (not shown) built in the base 4.

Sheet conveyance guides 12 and 14 are provided in front of and behind the reading sensor 10. The reading sensor 10
A transparent reading surface having a sheet supporting surface is provided above the reading unit. Reference numerals 18 and 20 denote drive rollers rotatably supported by the base 4, and the drive rollers 18 and 20 are connected to a drive motor M provided in the base 4 via a power transmission mechanism 24. ..

The drive motor M is constructed so that its rotation is controlled by a controller. The base 4 includes a front drive roller 18 and a rear drive roller 20 in front of the front drive roller 18.
The sheet conveying guides 26 and 28 are fixedly provided at the rear side of the sheet. Reference numeral 30 denotes a table for sheet conveyance, which is fixed to the front end of the base 4.

Reference numerals 32 and 34 denote front driven rollers and rear driven rollers, which are rotatably and vertically movable on the base 4 and are in contact with the corresponding drive rollers 18 and 20 by their own weight. Reference numerals 36, 38, 40, and 42 are sheet conveyance guides arranged on the base 4, and face the corresponding conveyance guides 26, 12, 14, and 28, respectively. 44
Is a shading plate, which is composed of a flat plate portion 44a, a front rising portion 44b, and a rear rising portion 44c, and has a U-shaped side surface as a whole.

The rising portion 44b is provided with the reading sensor 10
Is rotatably supported by the side plate of the base 4 via a rotation support shaft 52 so as to be rotatable about an axis line that is horizontal to the reading surface of the document and is perpendicular to the document conveying direction. A receiving member 46 is fixed to the upper end of the rising portion 44c, and the receiving member 46 is in contact with the upper surface of a supporting member 48 fixed to the paper transport guide 40 by the weight of the shading plate 44.

In the state where the receiving member 46 is locked to the supporting member 48, the white surface of the flat plate portion 44a is opposed to the reading surface of the reading portion of the reading sensor 10 in parallel with a predetermined interval. There is. The facing interval between the flat plate portion 44a and the reading surface is set to the same dimension as the normal sheet thickness.

Reference numeral 54 denotes a movable guide plate, and mounting plates 56 are fixedly provided on both sides of the movable guide plate. The mounting plate 56 is located above the sheet conveying guide 28 and is parallel to the drive roller 20. The base 4 is freely rotatable around various axes.
A shaft 58 is supported by the side plate of the.

The lateral width of the movable guide plate 54 is set to be substantially the same as the lateral width of the transport guide 28. The movable guide plate 54 is placed between the state of being placed on the upper surface of the upper cover 8 shown by a solid line in FIG. 1 and the state of being raised obliquely above the transport guide 28 shown by a virtual line. The shaft 58 is swingable.

The paper feed guide 28 is provided with an engaging recess 60 for locking the movable guide plate 54 at an obliquely upper position. The movable guide plate 54
In the approximate center of the guide surface that guides the document sheet 50 obliquely upward, a convex portion 54a having gently inclined surfaces a and b is formed at the front and rear ends, and further, at the tip of the movable guide plate 54. , A protrusion-shaped locking portion 5 for locking the progress of the document sheet 50
4b is formed.

Next, the operation of this embodiment will be described. When the document 50 is discharged from the front of the main body 2 to the rear,
As shown by the solid line in FIG. 1, the movable guide plate 54 is placed on the upper cover 8.

When the document 50 is manually inserted from the table 30 in front of the main body 2 between the guides 26 and 36 and further between the rollers 18 and 32, the document 50 is read by the rotation of the drive roller 18 driven by the motor M. The document 50 is sent to the sensor 10, and the document 50 is read there.

Further, the original 50 is moved on the sheet conveying guide 14 by the rollers 18 and 32, is inserted between the rollers 20 and 34, and is rotated from the discharge end of the sheet conveying guide 28 to the main body 2 by the rotation of the driving roller 20. As shown in FIG. 4, it is dropped and discharged backward.

After reading the original 50, from the rear of the main body 2,
In order to make a U-turn upward and return to the front of the main body 2, the movable cover 54 is centered around the shaft 58.
In FIG. 1, the movable guide plate 54 is swung clockwise, and one end of the movable guide plate 54 is locked to the vertical surface of the engaging recess 60. In this state, the movable guide plate 54 is in a state of standing obliquely upward on the transport guide 28, as shown by the dotted line in FIG.

In the above-mentioned state, the document 50 sent on the transport guide 28 rides on the movable guide plate 54 as shown in FIG. 5, and U-turns toward the front of the main body 2 along this. ..

When the original sheet 50 without curl or upward curl passes over the convex portion 54a,
There is no problem because upward movement is converted to forward movement by the forward guiding action of the convex portion 54a. However, with respect to the document sheet 50 having the curl downward, the document sheet 50 having the curl downward over the convex portion 54a has its leading end hitting the engaging portion 54b, and the original sheet 50 is moved by the feeding motion in the traveling direction. As shown in FIG. 3B, the portion near the leading edge of the document sheet 50 is bent toward the front A of the main body 2.

The curved portion is smoothly formed by the convex portion 54a. When the curved portion of the document sheet 50 becomes large, the leading edge of the document sheet 50 is disengaged from the locking portion 54b due to the weight of the document sheet 50, and the portion near the leading edge of the document sheet falls forward of the main body 2 as shown in FIG. 3C. Then, the traveling direction of the manuscript paper 50 is converted to the front of the main body 2, and the manuscript paper 5
0 is discharged to the front of the main body 2. Incidentally, the locking portion 54b
In addition to the protruding shape, as shown in FIG.
It is also possible to form a concave curve on the upper part of and to use this concave curved surface as the locking portion 54c.

[0023]

Since the present invention is configured as described above, by switching the position of the movable guide plate, it is possible to switch between front and rear ejection of a document, and even a sheet with a curl downward can be reliably conveyed forward. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is an overall side sectional view of a sheet conveyance type scanner.

FIG. 2 is a partially cutaway external view.

FIG. 3 is a side view for explaining the operation.

FIG. 4 is an explanatory side view.

FIG. 5 is an explanatory side view.

FIG. 6 is an explanatory side view showing another embodiment.

[Explanation of symbols] 2 main body 4 base 6 pivot 8 cover 10 reading sensor 12 guide 14 guide 16 reading surface 18 roller 20 roller 22 drive motor 24 power transmission mechanism 26 guide 28 guide 30 table 32 roller 34 roller 36 guide 38 guide 40 Guide 42 Guide 44 Shading plate 46 Receiving member 48 Supporting member 50 Original document 52 Rotating support part 54 Movable guide plate 54a Convex part 54b Locking part 54c Locking part 56 Mounting plate 58 Shaft

Claims (3)

[Claims] 1. A reading sensor 1 for reading a document from the front of the main body 2 by means of rollers 18, 20, 32, 34 for conveying paper in the main body 2.
In the paper-conveying type scanner which conveys the document to the reading surface above 0, further conveys the document to the rear of the main body 2, and ejects the document from the rear to the outside, the guide surface for guiding the document obliquely upward and the guide surface A convex portion 54a that is provided at the intermediate position and that changes the upward movement of the document into the forward movement of the main body.
And a movable guide plate 54 having locking portions 54b and 54c for locking the leading edge of the document that has passed over the convex portion 54a, is rocked between a position for guiding the document and a position away from the guiding position. A sheet discharging device, which is supported on the main body 2 as much as possible. 2. The paper ejection guide device for a paper transport type scanner according to claim 1, wherein the locking portion 54b is formed in a projection shape. 3. The sheet ejection guide device for a sheet conveyance type scanner according to claim 1, wherein the engaging portion 54c has a concave curved surface shape.