JPH0797199B2 - Document feeder for image forming apparatus - Google Patents

Description

The present invention relates to a document feeder for an image forming apparatus, and more particularly to a conveyor belt for feeding a document onto a contact glass surface of an image forming apparatus such as a copying machine or a facsimile. The present invention relates to an image forming apparatus having an inversion conveyance path for reversing an original and conveying the original onto the contact glass surface, and being openably and closably mounted on the upper surface of the image forming apparatus main body.

(B) Conventional Technology The above-described document feeder is used to automatically copy both the front and back sides of a document, but the document may be jammed in the transport belt or the reverse transport path. In this case, the entire original feeding device or a part of the cover of the reverse feeding path is opened and the original is taken out.
If the conveyor belt or the rollers of the reverse conveyance path are activated, it is dangerous to the operator and damages the document conveying apparatus.

On the other hand, it is known to provide one safety switch for each of the opening and closing of the document feeding device and the opening and closing of a part of the cover of the reverse feeding path.

(C) Problems to be Solved by the Invention The document feeder is operated to be opened and closed, and further has therein a mechanism for feeding a document to an automatic point and further reversing the document. Therefore, the document feeder is apt to have a very complicated structure, and a structural simplification is desired.

(D) Means for Solving Problems and Actions Thereof The present invention includes a conveyor belt for conveying an original on the contact glass surface of an original conveying apparatus, and a reverse conveying path for inverting the original and conveying it on the contact glass surface. In the image forming apparatus having an openable and closable upper surface of the image forming apparatus main body, a part of the cover of the reversing conveyance path is configured to be openable and closable,
A swing mechanism that swings according to opening and closing of a part of the cover,
A fixed piece fixed to a predetermined position of the immovable portion of the document feeder, and a relative position variation with the fixed piece attached to the swing mechanism, based on opening and closing of a part of the cover and opening and closing of the document feeder. And a switch capable of detecting the open / closed state of the document feeder, the document feeder of the image forming apparatus.

That is, according to the present invention, the switch is attached to a swinging mechanism that swings by opening / closing a part of the cover of the reversing conveyance path, and the opening / closing of either the document conveyance device or a part of the cover with respect to the immovable fixed piece. However, the switch for detecting the opening and closing of the document feeder and the cover is provided as a single switch, thereby simplifying the structure of the document feeder.

(E) Examples The present invention will be described in detail based on the examples shown in the drawings. The present invention is not limited to this.

First, referring to FIGS. 4 to 5, the document feeder 2 of the copying machine 1
Has a conveyor belt 4 for conveying a document on the surface of the contact glass 3 and a reversing conveyance path 5 for reversing the document and conveying it on the surface of the contact glass 3, and is mounted on the upper surface of the copying machine body 6 so as to be openable and closable. Has been done. 7 and 7a are hinges, 8
Is a cover of the document conveying device 2, 9 is a part of the cover, that is, a cover part of the reverse conveying path 5, and the part 9 is attached to the other part so as to be openable and closable.

Thus, the hinge portion 7 substantially includes a support plate 10 that substantially supports the document feeder 2 and a spindle 11 that rotatably supports the support plate 10.
A fixed plate 12 as an immovable part which is supported by the main body 6 and is fixed to the copying machine main body 6; and a fixed piece 13 fixed to the fixed plate.
And a swing mechanism 14 which is mounted on the support plate 10 and swings in response to opening and closing of the part 9 of the cover, and a micro switch 15 as a safety switch attached to the swing mechanism. Since the hinge portion 7a has the same structure as the hinge portion 7 with respect to the opening and closing of the document feeder 2, the description thereof will be omitted.

The swing mechanism 14 is mainly composed of a lever 16, a swing plate 20, and a spring coil 18, the lever 16 is rotatably supported by a fixed pin 17 of the support plate 10, and one end 25 is a part 9 of the cover. It is arranged so as to be pressed in the A rotation direction, the other end 19 is pulled in the reverse A rotation direction by the spring coil 18, and is pin-connected to one end 21 of the rocking plate 20 by a long hole. Oscillating plate 20 is spindle 22
Is rotatably supported by the micro switch 15 at the other end 23.
Is attached.

The fixed plate 12 is bent in a substantially U shape, the bottom surface is fixed to the main body 6, and the main shaft 11 is pivotally supported by the facing surface. The support plate 10 is bent into a substantially N-shape so as to cover the fixed plate 12, and is supported by the main shaft 11 via a substantially N-shaped adjusting plate 24 which covers the support plate 10. There is. The adjusting plate 24 is provided to adjust the height of the support plate 10.

Next, the operation of the hinge portion 7 will be described.

(A) Opening and closing a part of the cover In particular, when the part 9 of the cover is opened in FIG. 2, one end 25 of the lever 16 biased in the reverse A rotation direction by the spring coil 18 causes The push-down by the part 9 is released, and the part 9 becomes free and rotates in the reverse A rotation direction. Thus, the oscillating plate 20 rotates in the B rotation direction in response to the rotation of the lever 16, and the operating piece 26 of the microswitch 15 and the fixed piece.
The position relative to 13 is changed, and the micro switch 15 is operated. That is, the micro switch 15 outputs a detection signal for opening the part 9 of the cover, and forcibly turns off the drive motor (not shown) so that the operation of each roller of the reverse conveyance path 5 does not occur.

(B) Opening / Closing the Original Conveying Device In particular, in FIG. 3, when the original conveying device 2 is opened, the supporting plate 10 rotates about the main shaft 11 in the C rotation direction, so that the supporting plate 10 is mounted on the supporting plate 10. The relative position between the actuating piece 26 and the fixed piece 13 of the microswitch 15 which has been operated is changed, and the microswitch 15 is actuated. That is, the micro switch 15 outputs a detection signal of the opening of the document feeder 2 and forcibly turns off the drive motor (not shown) so that the operation of the conveyor belt 4 of the document feeder 2 does not occur.

Reference numeral 27 is a link, which regulates the rotation angle of the support plate 10 in the C rotation direction. That is, one end of the link 27 has a shaft 29 that can slide along the bending slit 28 formed in the support plate 10.
The other end of the link 27 is pivotally supported by the fixed plate 12. The shaft 29 is pulled and urged below the bending slit 28 in the open state by a pair of strong spring coils (not shown). Therefore, the support plate 10 tries to move to the lower end of the bending slit 28, but the link 27
The movement is regulated by.

As described above, the manuscript conveying device 2 of the copying machine 1 senses whichever one of the cover portion 9 and the manuscript conveying device 2 is opened by only one micro switch 15, and detects the appropriate portion to detect the corresponding portion. The drive can be stopped.

(F) Effect of the Invention According to the present invention, it is possible to detect the opening of either the document feeder or the part of the cover with one switch, so that the driving of the corresponding part can be stopped with a simple configuration. Can be guaranteed.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention,
FIG. 3 is an explanatory diagram for explaining the operation of the main part, FIG. 4 is an explanatory diagram of the document feeder, and FIG. 5 is an overall configuration explanatory diagram. 1 ... Copier, 2 ... Document transport device, 3 ... Contact glass, 4 ... Convey belt, 5 ... Reverse transport path, 6 ... Copier body, 7 ... Hinge part, 9 ... Cover Part, 10 …… support plate, 11 …… spindle, 12 …… fixing plate, 13 …… fixing piece, 14 …… oscillating mechanism, 15 …… micro switch.

Claims (1)

[Claims] 1. An image forming apparatus having a conveying belt for conveying an original on a contact glass surface and an inversion conveying path for reversing an original and conveying the original on the contact glass surface, and opening and closing on an upper surface of an image forming apparatus main body. In the image transfer device that can be mounted, a part of the cover of the reverse transfer path is configured to be openable and closable,
A swing mechanism that swings according to opening and closing of a part of the cover,
A fixed piece fixed to a predetermined position of the immovable portion of the document feeder, and a relative position variation with the fixed piece attached to the swing mechanism, based on opening and closing of a part of the cover and opening and closing of the document feeder. A document transporting device of an image forming apparatus, which is operated by means of a cover and a switch capable of detecting an open / closed state of the document transporting device.