JP3399568B2 - Document protection device for image forming equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine and, more particularly, to an original protecting device for an image forming apparatus provided in an original reading apparatus. 2. Description of the Related Art Conventionally, an image forming apparatus forms a latent image on a photosensitive member, and includes a conveying roller for feeding a document fed by a document feeder at a constant speed, and an illumination for irradiating the document. And an exposure glass, and a document reading device for reading an image while feeding the document is provided. When a document is placed on the document reading apparatus and conveyed, the mechanism is generally provided with a mechanism for restricting the document from being skewed. If the document is skewed, the document must pass through a path other than the regular path of the transporting unit, and hit or strike somewhere, causing a problem that the document may be damaged or broken and the document may be damaged. In the case where the skew of the skew is the same, the larger the document, the larger the amount of skew and the greater the adverse effect on the document. SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus which can stop the conveyance of a document when the skew amount of the document exceeds a certain range and protect the document without damaging it. An object of the present invention is to provide a document protection device. In order to achieve the above object, the present invention comprises a transport roller for feeding a fed document at a constant speed, and illumination and exposure glass for irradiating the document. A document reading device for reading an image while feeding the document, and forming a latent image on a photoreceptor, provided in a document conveying path of the document reading device, perpendicular to a conveying direction and having a predetermined width from a maximum document width. A document protection device for an image forming apparatus, comprising: a document detection device positioned outside by a dimension. By employing the document protection device of the image forming apparatus of the present invention, a document detection device which is perpendicular to the document conveyance path of the document reading device and located outside the maximum document width by a predetermined dimension is detected. By providing the apparatus, when the skew amount of the original exceeds a certain range, the conveyance of the original is stopped, and the original is automatically protected without being damaged. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 7 is a schematic configuration diagram of an image forming apparatus provided with a document reading device. In the figure, an image forming apparatus 1
A document reader 3 is mounted on the upper part, reads an image of a document supplied by a document feeder (not shown), forms a latent image on the photoconductor 11 via a mirror 5, a lens 7, and a mirror 9, The developing is performed by the developing device 13 and the sheet feeding cassette 15
Plain paper inner is fed by a paper feed roller 17, the toner image is transferred by the transfer-separation Chi catcher over di turbocharger 19, clean the toner at the transfer after the cleaner 21, it is transported by the transport unit 23 fixing unit 25 The sheet is discharged after being fixed. FIG. 1 is a schematic sectional view of an embodiment of a document detecting device in which a document protecting device according to the present invention is implemented. In the figure, the original is placed on a guide plate 27 and inserted in the direction of arrow A up to the abutment plate 29. At this time, the sensor 31 detects that the document has been inserted, and after a predetermined time, the abutment plate 29 rotates in the direction of the arrow d and moves to the position 29A. At this time, the support plate 33 rotates in the direction of arrow b,
The drive roller 36 rotating in the direction of the arrow a descends and sends the document to the abutment plate 35 together with the driven roller 38. The timing with the plain paper in the image forming apparatus 1 is checked,
5 rotates in the direction of the arrow c to reach the position of 35A, and the conveyance of the document is started. The original is driven by driving rollers 37, 37A, 37B and driven rollers 39, 39A,
39B, the sheet is conveyed in the direction of arrow B via the conveyance path 41 and discharged. On the way, the illumination lamp 43 irradiates the document passing therethrough, and the information is transmitted to the image forming apparatus 1 main body side in the arrow direction e through the exposure glass 45. An original detecting device 47, which is an original protecting device according to the present invention, mainly comprises a lever member 49 and a photo sensor 5.
1 is comprised. The lever member 49 is rotatably supported on the support plate 33 by a shaft 55, and has a fan-shaped box body 53 and a lever end 5 provided at a lower end of the box body 53.
7 and a torsion coil spring 59 which is provided on the box portion 53 and always urges in the direction opposite to the arrow direction f. As shown in FIGS. 2 and 3, the photo sensor 51 is composed of a light emitting element 63 and a light receiving element 65, and is always mounted on the mounting plate 61 through a groove 67 provided in the box 53. opposite that provided on. As shown in FIG. 4, the original detecting device 47 is located at a right angle to the conveying direction in the original conveying path, and is larger than the maximum original width indicated by the original regulating plates 69 provided on both sides of the driving roller 36 and the driven roller 38. , And are arranged on both outer sides by a predetermined size. As shown in FIG. 1, the original reading device 3
Is moved in the document discharging direction B by a plurality of moving rollers 71, and is positioned at the document reading device 3A as shown in FIG. 7, and performs a normal copy in which the document is fixed without using the document reading device 3. It is possible to The document detecting device 47 configured as described above
When one or both of the two levers 57 are simultaneously depressed for some reason when the document passes between the levers 57, as shown in FIG. The document protection device is located at 57A and automatically protects the document without damaging the document by stopping the conveyance of the document from the open state of the photo sensor 51 to the closed state. FIG. 5 is a schematic explanatory view of another embodiment of the present invention. In the figure, the original detecting device 73 is provided with a photo sensor 51 including a light emitting element 63 and a light receiving element 65, and the mounting plate 6
1 is a document protection device that detects a skew of the document and automatically protects the document when the passing document passes directly between the light emitting element 63 and the light receiving element 65. FIG. 6 is a schematic explanatory view of still another embodiment of the present invention. In the drawing, the original detecting device 75 has a photosensor 51 composed of a light emitting element 63 and a light receiving element 65 disposed on a mounting plate 61. Normally, when the photosensor 51 is opened with the balance maintained, the original strikes the lever 77. At this time, the lever 77 rotates and the photo sensor 51 is closed to detect the skew of the document and automatically protect the document. The present invention is not limited to the above embodiment, but can be embodied in other modes by making appropriate design changes. As is apparent from the above description, the document protecting device of the image forming apparatus according to the present invention is arranged so that the document protecting path of the document reading apparatus is perpendicular to the carrying direction and larger than the maximum document width. By providing a document detection device positioned outside by a predetermined size, the problem of the related art is effectively solved. When the skew amount of the document exceeds a certain range, the conveyance of the document is stopped and the document is damaged. Without any protection.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of an embodiment of the present invention. FIG. 2 is a main part configuration diagram of the document protection device shown in FIG. 1; FIG. 3 is an explanatory diagram of an operation state of FIG. 2; FIG. 4 is an attachment state diagram of FIG. 2; FIG. 5 is a schematic configuration diagram of another embodiment of the present invention. FIG. 6 is a schematic configuration diagram of still another embodiment of the present invention. FIG. 7 is a schematic configuration diagram of an image forming apparatus in which the present invention is implemented. DESCRIPTION OF REFERENCE NUMERALS 1 image forming apparatus 3 document reading device 29 abutment plate 33 support plate 43 illumination lamp 47 document detecting device 51 photo sensor 49 lever member 53 box body portion 73, 75 document detecting device

Continuation of front page (72) Inventor Yasunori Maeda 6-3-3 Shimorenjaku, Mitaka City, Tokyo Copier Corporation (72) Inventor Naoto Mori 6-3-3 Shimorenjaku, Mitaka City, Tokyo Copier Corporation (72) Inventor: Tsukasa Tejima 6-3-3, Shimorenjaku, Mitaka City, Tokyo Copier Corporation (72) Inventor: Hidetaka Fukiharu 6-3-3, Shimorenjaku, Mitaka City, Tokyo Copier Corporation (72) Inventor Kazuhiro Nishimura 6-3-3 Shimorenjaku, Mitaka City, Tokyo, Japan (72) Inventor Iwao Kawamura 6-3-3 Shimorenjaku, Mitaka City, Tokyo, Japan Copier Corporation (56) References JP JP-A-60-236955 (JP, A) JP-A-4-106048 (JP, A) JP-A-59-36053 (JP, A) JP-A-4-235843 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) B65H 7/10 G03G 15/00 H04N 1/00

Claims (1)

(57) [Claim 1] It has a transport roller for feeding a fed document at a constant speed, illumination and an exposure glass for irradiating the document, and reads an image while feeding the document. An image forming apparatus provided with a document reading device and forming a latent image on a photoconductor, comprising: a plurality of documents which are provided in a document conveying path of the document reading device and which are positioned at right angles to a conveying direction and located outside by a predetermined size from a maximum document width. A plurality of document detection devices, each of which has the same shape, a fan-shaped box body in which a light-shielding portion is formed in an arc part of the fan, and a box body part that protrudes downward from a pivot of the fan. One in this box
A document formed on the body and deviating from the document conveyance path
A lever end that rotates and a document that has deviated from the document conveyance path abuts against the lever end.
During rotation of the box body when the lever end is rotated
A shaft body formed as the core, the light-emitting element and a light-receiving element disposed on both sides of the light-shielding portion;
When the document does not hit the lever end with the photo sensor consisting of
The light emitted from the light emitting element passes through the groove formed in the light shielding portion.
The box part so that the light is received by the light receiving element.
A torsion coil spring for urging the box body.
For example, when a document is abutted against the lever end, said light emitting element
The shaft so that the light emitted by the child is blocked by the light blocking part.
An image forming apparatus, wherein the box portion is rotated about a center .