JPH01214556A - Automatic original manuscript feed device - Google Patents

Abstract

PURPOSE:To enable matching the widthwise ends of an original manuscript with a manuscript position on a platen by applying the constitution wherein a carrying and winding body is shifted in a direction orthogonal with a manuscript carriage direction on the basis of a detected signal from a detecting means and controlling a shift means so that the manuscript will match with manuscript carriage reference. CONSTITUTION:When carried with a roller pair 11 to a space between a platen 12 and a carriage belt 13, a manuscript M is detected with a widthwise dislocation sensor 25 in respect of a dislocation amount from carriage reference, and carried to and placed on the platen 12 with a transfer belt 13. A control means, upon receipt of a detected signal from the sensor 25, turns cams 37a and 37b with the servomotor 42 of a shift means 36, depending upon the aforesaid dislocation amount and moves the belt 13 toward a direction orthogonal with a manuscript carriage direction, thereby matching the manuscript M with manuscript carriage reference.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to an automatic document feeder used in image forming apparatuses such as copying machines and facsimile machines. ).

(B) Prior Art Conventionally, an automatic document feeder equipped with a conveyor belt has been known.As shown in FIG. There is. The automatic document feeder 1' has a document tray 3 on which documents are stacked, and a paper feed roller 5 that feeds the documents is disposed downstream of the tray 3. Further, facing the roller 5, a weight 6 that can be raised and lowered to prevent the document from flapping is disposed, and downstream of the paper feed roller 5, a conveying roller 7 that conveys the document and a weight 6 that separates the document. A separation belt 9 is provided. Furthermore, a conveyance path 10 for conveying the original is provided downstream of the rollerf, and the conveyance path 10
A pair of conveying rollers 11 is provided. A conveyance belt 13 wound around a drive roller 21 and a driven roller 22 that cover the platen 12 of the copying machine 2 is disposed downstream of the conveyance path 10. A U-shaped paper discharge path 15 is arranged below the path 10. Further, the inner guide surface of the U-shaped portion of the paper ejection path 15 is constituted by a large roller 16, and a pair of paper ejection rollers 17 are provided at the downstream end of the paper ejection path 15 for ejecting the original to the document tray 3. is installed. Furthermore, a reversing path 19 is communicated with the conveying path 10 and the paper ejecting path 15, and a flapper 20 for branching the document is disposed at a branching point between the reversing path 19 and the paper ejecting path 15. There is.

Then, when a document is stacked on the document tray 3 and a start key (not shown) is pressed, the document is held between the paper feed roller 5 and the weight 6 that descends to press the document against the roller 5, and is held by the conveyance roller 5. will be sent to. Then, the original ζ is separated one by one by the roller 7 and the separation belt 9, and only the lowest original is transported to the transport roller pair 11, which transfers the platen 12 to the transport belt 1.
Preferential treatment will be given to those between 3 and 3. Further, the document is placed on the belt 13
The document is conveyed and placed at the document placement position on the platen 12, and the image is copied onto a sheet by the copying machine 2. and,
After copying, the document is conveyed to the left by the conveyor belt 13 and discharged to the document tray 3 through the paper discharge path 15 .

←→ Problem to be Solved by the Invention By the way, in the above-mentioned automatic document feeder 1', when installing the device 1' in the copying machine 2 and during maintenance, the support leg 23 that supports the automatic document feeder 1' is (see Figure 12) in a direction perpendicular to the document transport direction, the widthwise edge of the document can be moved to the platen 2.
There has been a demand for an automatic document feeder that aligns the widthwise end of each document with the document position on the platen 2 when conveying each document.

(C) Means for Solving the Problems The present invention aims to solve the above-mentioned problems, and for example, as shown in FIGS. The hanging body (13) moves the original to the original processing position (
In an automatic document feeder (1) configured to convey and place a document on a document feeder (12), the conveyance wrapper (13) is supported movably in a direction perpendicular to the document conveyance direction, and Based on a detection means (25) for detecting a deviation, a movement means (36) for moving the conveyance wrapper (13) in a direction perpendicular to the document conveyance direction Cζ, and a detection signal lζ from the detection means (25), The transport winding body (January is the document transport direction C)
A control means (5) for controlling the moving means (36) so as to align the document with the document conveyance reference by moving the document in a direction perpendicular to the direction ζ.
o).

(e) Operation Based on the above-described configuration, the deviation of the document fed to the conveyance wrapper (13) from the document conveyance standard is detected by the detection means (25), and the document is detected by the conveyor wrapper (13). The document is transported and placed at the document processing position (12). Then, the control means (5o) receives the detection signal from the detection means (25).
) uses the moving means (36) to move the transport winding member (13) in a direction perpendicular to the original transport reference to align the original with the original transport reference.

Note that the symbols in brackets above do not limit equivalent configurations.

(F) Examples Examples of the present invention will be described below with reference to the drawings.

Note that the same parts as those described above are given the same reference numerals and the description thereof will be omitted.

As shown in FIG. 2, the automatic document feeder 1
A lateral displacement sensor 25 for detecting lateral displacement of the document M from the conveyance reference is provided downstream of the paper discharge path 15 and near the conveyance belt 13 , and a paper discharge sensor 26 is provided downstream of the paper discharge path 15 and upstream of the paper discharge roller pair 17 . It is equipped with

As shown in FIG. 3, the lateral shift sensor 25
It has a surface light emitter 30 consisting of a light source 27 and a diffuser plate 29, and the diffuser plate 29 is provided with a hole 29a. Further, a guide 31 is disposed at a position opposite to the surface light emitter 3o, and a hole 31a of the same size as the hole 29a is bored in the guide 31, and a hole 31a is provided below the hole 31a. The hole 31. A line sensor 32 is disposed to receive light from a light source 27 configured with a CCD or the like having a size that covers the area a.

Furthermore, the driving roller 21 and the driven roller 22 are
As shown in the figure, each shaft 21a122a is rotatably supported by the body frame 33, and these shafts 21. a, 22a are urged toward the back by a spring 35 whose one end is fixed to the body frame 33. and,
Cams 37a and 37b of a lateral shift correction device 36 are in contact with the rear ends of these shafts 21a and 22a, and rotation of the cams 37 causes the shafts 21a and 22a and the conveyor belt 13 to
are arranged to move together in the direction of arrow Z. Moreover, the shaft 21. A pulley 39 is fixed on the back side of a, and the pulley 39 is connected to a pulley 4 fixed to the output shaft of a motor 40 via a belt (not shown).

Further, the tank misalignment correction device 36 has a correction motor 42, as shown in detail in FIGS. 4 and 5, and a gear 43 is fixed to the output shaft of the motor 42. The cam 37a is rotatably supported by a shaft 45 erected on the body frame 33 in the vicinity of the motor 42, and a gear 46 is provided below the cam 37a. The gear 46 meshes with the gear 43 via an idle gear 47. Moreover, the cam 37a and the cam 37
b is connected to the cams 37a and 37b by a link rod 49, so that the cams 37a and 37b are interlocked with each other.

On the other hand, the automatic document feeder 1 has a control section 50, as shown in FIG. The control section 50 is further connected to a control section 51 of the copying machine 2.

As shown in detail in FIG. 7, the paper ejection roller pair 17 is composed of upper and lower rollers 7a and 17b that press into contact with each other, and the upper roller 17a is in contact with the lower roller 1.
It is rotatably supported by a support plate 53 supported by a shaft 52 of 7b. A gear 55 is mounted on the support plate 53.
is supported coaxially with the roller 17a with frictional force being regulated, and the gear 55 meshes with a gear 59 fixed to the output shaft of a motor 57 via a gear 56 supported on a shaft 52. .

The operation of this embodiment will be explained with reference to the flowchart in FIG.

When a document M is placed on the document tray 3 and a start key (not shown) is pressed, the paper feed roller 5 starts rotating and the weight 6 descends to press the document M against the paper feed roller 5. As a result, the document M is fed to the nip between the conveyance roller 7 and the separation belt 9, and
The documents are separated one by one and only the lowest document M is transported to the transport roller pair 11 (Sl). Then, the document M is moved between the platen 12 and the conveyor belts 1 to 1 by the roller pair 11.
3. At this time, the deviation amount δ of the document M from the transport reference O is detected by the lateral deviation sensor 25 (S
2), a control unit 5 that receives a detection signal from the sensor 25;
0, it is determined whether the deviation amount δ is within a preset value (S3). If it is determined that the deviation amount δ is within the set value, the control unit 50ζ detects whether the document M has been sent to the document placement position on the platen 12 by the conveyor belt 13 from a sensor (not shown). Make decisions based on signals (
S4). Then, when it is determined that the original 1iiJM has been conveyed to the document placement position, the control unit 50 causes the correction motor 42 to rotate the cam 37a by a predetermined amount in accordance with the deviation amount δ detected by the lateral deviation sensor 25 (S5). ), the cam 37a
As a result of the rotation, the cam 37b rotates together via the link rod 49. Furthermore, the shaft 21a is rotated by the rotation of these cams 37a and 37b.

The conveyance bell 1-13 moves together with the conveyor belt 22a in the direction of arrow Z to correct the lateral shift of the document M. After the lateral deviation correction is completed, the control unit 50 requests the control unit 51 of the copying machine 2 to copy. Then, the control section 51 of the copying machine 2 reads the image of the document M into a copying section (not shown), and further copies it onto a sheet 1- fed from a paper feeding section (not shown) (S6). After the copying is completed, the document M is conveyed leftward by the conveyor belt 13, passes through the paper discharge path 15, and is conveyed to the pair of paper discharge rollers 17. Then, when the document M is held between the pair of rollers 17 and discharged toward the document tray 3, when the paper discharge sensor 26 detects the rear end of the document M, the motor 57 rotates by a predetermined amount. The rotation of 57 is gear 59, 56.5
5, the support plate 53 and the upper roller 17a are rotated in the direction of the arrow from the home position A to the discharge position B (9th
(see figure). As a result, the original M is gently ejected to the uppermost position of the originals M stacked on the original tray 3 (S
7). Then, the original M on the original tray 3 is copied in the same manner as described above (S8), and when all the original MM have been copied, the copying work is completed.

Further, in S3 described above, if it is determined that the deviation amount δ of the original IIM is not within the set value, the control unit 50 controls the original [M
(S9), and an alarm is issued to an operation unit (not shown) (310).

In addition, in the above-mentioned embodiment, the surface light emitter 3 is used as the detection means.
0 and the line sensor 32, the present invention is not limited to this, and a plurality of reflective or transmissive sensors may be used.

Further, in the above embodiment, the conveyance belt 13 is moved in parallel to correct the deviation amount δ of the original T14M, but the present invention is not limited to this, and as shown in FIG. 10, two correction motors 42 are provided, It is also possible to correct the skew feeding of the document M by tilting the conveyor belt 13.

(G) As described in detail, according to the present invention, the conveyor wrapping body is
4WI Move in a direction perpendicular to the feed direction and move the original 8I! Since it is configured to match the document transport reference, it is possible to correct the deviation of the document from the document transport reference and accurately place the document at the document processing position.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing essential parts of an automatic document feeder according to the present invention, FIG. 2 is a front sectional view showing the automatic document feeder according to the present invention, and FIG. FIG. 4 is a front sectional view showing the detection means, FIGS. 4 and 5 are views showing the moving means according to the present invention, and FIG. 6 is a block diagram showing the control means according to the present invention. Also, Figures 7 and 9
The figure is a front sectional view showing the operation of the embodiment. 9. Furthermore, FIG. 8 is a flowchart showing the operation of the present invention. FIG. 10 is a plan view showing another embodiment of the present invention. Moreover, FIG. 11 and FIG. 12 are diagrams showing a conventional example. 1... Automatic document feeder, 1'2.
・P-document processing position, 13.・Transport winding body, 25.
- Detection means, 36.. Movement means, 50.. Control means. Applicants Canon Co., Ltd., Nippon Seimitsu Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] 1. In an automatic document feeder in which a document is conveyed and placed at a document processing position by a conveyance wrapper, the conveyor wrapper is supported so as to be movable in a direction perpendicular to the document conveyance direction. a detection means for detecting a deviation of the document from a document conveyance reference; a moving means for moving the conveyance wrapper in a direction perpendicular to the document conveyance direction; An automatic document feeder comprising: control means for controlling the moving means to move the wrapping body in a direction perpendicular to the document conveyance direction so as to align the document with a document conveyance reference.