JPS646507Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic copying machine, and more particularly to an electrostatic copying machine having a function of manually feeding copy paper into the body of the electrostatic copying machine to make copies.

In an electrostatic copying machine that transfers an image formed on an electrostatic photosensitive layer on the surface of a photosensitive drum onto copy paper, the copy paper is It may stick to the surface of the photosensitive drum and cause paper jams. In some conventional electrostatic copying machines, a peeling device is provided on one side of the photosensitive drum, and the peeling device pulls and guides one side edge of the copy paper transferred to the outside of the photosensitive drum. is configured to do so. In such an electrostatic copying machine, it is necessary for one side edge of the copy paper to pass through the peeling device, and if the copy paper is machined at a position where one side edge of the copy paper does not pass through the peeling device. If the paper is manually fed into the body, the peeling action will not be achieved and paper jams may occur. Further, when manually feeding paper, the paper tends to be fed diagonally, causing a problem that copying cannot be performed properly.

Another prior art is a paper feeding error detection device for an electrostatic copying machine disclosed in Utility Model Application Laid-Open No. 50-33051, a part of which is shown in FIG. A manual feed guide 31b is provided in the opening 31a of the body 31 of the electrostatic copying machine, and the manual feed guide 31b can be opened and closed. A detection element 33 is provided downstream of the paper feed roller 37 . The copy paper 35 that has passed the detection element 33 is conveyed by a pair of conveyance rollers 34, and the toner image on the photosensitive drum 38, which has been visualized by a developing device 36, is transferred and fixed, thereby making a copy. It turns out. The stacked copy paper 39 is fed by a paper feed roller 40,
It is supplied toward the conveyance roller 34.

When manually feeding the copy paper 35, the copy paper 35 is pushed through the manual feed guide 31b shown by the imaginary line, and the properly inserted copy paper is detected by the detection element 33 via the paper feed roller 37. Thereafter, when the print button is pressed, copy paper is supplied by the conveyance roller 34 and a copying operation is started.

In such prior art, the detection element 3 is not activated until the copy paper 35 is pushed deeply into the body 31.
3, the copy paper is detected, and in this state the print button is pressed to make a copy. Therefore, even if the copy paper 35 is inserted into the machine body 31, if it is not detected by the detection element 33, the reason is (a) the copy paper 35 is not inserted enough into the machine body 31; Is it from the body?
or (b) it is not possible to determine whether this is because the copy paper 35 is fed diagonally, resulting in poor operability.

Further, in this prior art, the copy paper 35 is configured to be inserted into the machine body 31 along the manual feed guide 31b, but there is no description that one end side of the copy paper 35 is guided. Therefore, it is difficult to appropriately manually feed the copy paper 35, and there is a problem in that the paper is easily fed diagonally.

Another problem with this prior art is that when manually feeding paper, the copy paper must be passed between paper feed rollers 37, which makes feeding difficult depending on the type of copy paper. In particular, thin copy paper tends to wrinkle easily. Therefore, at this time, the pair of rollers 37 must be temporarily separated from each other.

Moreover, in this prior art, the copy paper 35 is detected by the detection element 33 when it is manually fed, and the copying operation can only be started by pressing the print button after that. Therefore, the operator cannot use both hands to concentrate solely on the task of inserting the copy paper 35 into the machine body 31. Therefore, the operator must not use both hands to insert the copy paper 35 being manually fed while pressing the print button.
There is a risk that the paper may be fed skewed by mistake, which may cause a paper jam.
Furthermore, paper is fed at an angle and copying is not performed properly.

The purpose of the present invention is to provide an electrostatic copying machine that has improved operability, can properly feed copy paper, prevents paper jams and skewed paper feeding, and has a simplified configuration. That's true.

In the present invention, one side edge of the copy paper is aligned with a guide piece 23 provided on the side edge of the manual insertion table 3 of an electrostatic copying machine, and the copy paper is manually fed into the machine, and the copy paper is copied by the copy paper conveying means 6. In an electrostatic copying machine that conveys paper, the guide piece 23 is disposed at or near the guide piece 23 and on the upstream side of the copy paper conveying means 6.
The copy sheets are arranged within a length range along the copy paper transport direction, and are spaced apart from each other by a distance l2 smaller than the minimum length of the copy paper that can be copied on a virtual straight line along the paper feeding direction 5, and the copy paper a plurality of first detection elements 25, 30 for detecting the one side end of the copy paper conveying means 6; When at least two of the second detection element 27 and the first detection elements 25 and 30, which are arranged at a distance from each other and detect the copy paper, detect the one side edge of the copy paper, drive the copy paper conveying means 6; control means 28 and 29 for disabling the copy paper conveyance means 6 when the second detection element 27 detects copy paper; and conveying the copy paper conveyed from the copy paper conveyance means 6 to the second detection element 27. An electrostatic copying machine is characterized in that it includes means for:

According to the present invention, when manually feeding copy paper into an electrostatic copying machine, one side edge of the copy paper is guided along the guide piece provided at the side edge of the manual feed tray of the electrostatic copying machine. feed paper to the machine at the same time. This reliably prevents the copy paper from being inserted diagonally when the copy paper is fed.

Furthermore, the copy paper that is fed with one end along the guide piece is within the length range along the copy paper conveying direction of the guide piece at or near the guide piece and on the upstream side of the copy paper conveying means. One end of the paper is detected by at least two of the plurality of first detection elements provided on a virtual straight line along the paper feeding direction. The electrostatic copying machine according to the present invention is configured to operate the copy paper conveying means only when the at least two first detection elements arranged as described above detect the one side edge of the copy paper. ing.
Therefore, even if copy paper is conveyed diagonally, this can be reliably detected, and malfunctions and paper jams caused by diagonal conveyance can be reliably prevented.

The first detection elements 25, 30 are spaced apart from one another by a distance l2 that is smaller than the minimum length of a copy paper that can be copied, and the distance between the copy paper transport means 6 and the second detection element 27 is a value l1 that is greater than or equal to the maximum length of a copy paper that can be copied.
When at least two of the detectors 5 and 30 detect the one side edge of the copy paper, the copy paper transport means 6 is driven, so that the copy paper can be prevented from being transported at an angle as described above.

FIG. 1 is a perspective view of an electrostatic copying machine according to an embodiment of the present invention. A document holding plate 2 is provided at the top of the machine body 1, and the document holding plate 2 presses the document against the document table. An insertion table 3 for manual paper feeding is provided on the right side of the machine body 1 in FIG. The copying process is performed, and the copy paper 18 that has been copied is placed on a receiving plate 4 provided on the left side of the machine body 1 in FIG.
is discharged.

FIG. 2 is a perspective view showing a simplified conveyance path of the electrostatic copying machine shown in FIG. 1. FIG. Copy paper 18 manually fed from insertion table 3 in the direction of arrow 5 is conveyed toward photosensitive drum 8 by copy paper conveyance means 7 including a pair of paper feed rollers 6 . The photosensitive drum 8 is used to transfer the image formed on the electrostatic photosensitive layer onto copy paper. The surface of the photosensitive drum 8 is charged and charged along the movement path of the electrostatic photosensitive layer.
An image forming processing area for performing exposure and development, and a transfer area for transferring the toner image formed on the electrostatographic photosensitive layer to copy paper are provided. In the transfer area, the electrostatic photosensitive layer of the photosensitive drum 8 comes into contact with the copy paper, and the toner image is transferred. Reference numeral 9 indicates a transfer device. The transferred copy paper 18 is transferred to the fixing roller 1
0, and is discharged onto the receiving plate 4 by the discharge roller 11.

FIG. 3 is a plan view of the vicinity of the photosensitive drum 8.
The photosensitive drum 8 is pivotally supported on the body 1 by a shaft 12. A chain 14 is wound around a sprocket wheel 13 fixed to the shaft 12, and the photosensitive drum 8 is driven to rotate. For example, one rotation of the photosensitive drum 8 completes one copying process. A peeling area 15 and an image processing area 16 are formed on the photosensitive drum 8 along its axial direction. The outer diameter of the outer periphery of the photosensitive drum 8 forming the peeling area 15 is smaller than the outer diameter of the outer periphery of the photosensitive drum 8 forming the image processing area 16. Copy paper 18 on which the transfer process has been completed
is peeled off.

4 is a perspective view of the photosensitive drum 8 viewed from the discharge side in the copy paper transport direction 5, and FIG. 5 is a sectional view of the photosensitive drum 8 viewed from the peeling area 15 side. A peeling claw 17 is provided close to the outer periphery of the peeling area 15.
The peeling claw 17 has an arcuate surface 19 that guides one end of the copy paper 18 radially outward of the photosensitive drum 8 . The top portion 19a of the arcuate surface 19 protrudes radially outward from the outer peripheral portion of the photosensitive drum 8 forming the image processing area 16. Copy paper 18
One end of the photosensitive drum 8 is peeled off from the photosensitive drum 8 along this arcuate surface 19 and guided by a peeling guide roller 20 provided on the discharge side of the photosensitive drum 8 .

FIG. 6 is a simplified plan view of the paper feed roller 6 and the insertion table 3. Power from a chain 21 which is constantly driven is transmitted to the paper feed roller 6 via an electromagnetic clutch 22.

FIG. 7 is an end view taken along the section line - in FIG. 6. A guide piece 23 extending along the copy paper conveyance direction 5 is fixed to one end of the insertion table 3 .
One end 24 of the manually fed copy paper 18 is guided along this guide piece 23. Guide piece 23
is positioned such that one end 24 of the copy paper 18 guided along the guide piece 23 passes through the separation area 15 of the photosensitive drum 8. Copy paper 1
8 is manually fed with its one side edge 24 along the guide piece 23, the one side edge of the copy paper 18 reliably passes through the separation area 15 in the machine body 1,
Therefore, the copy paper 18 can be peeled off from the photosensitive drum 8 by the peeling claw 17.

Therefore, according to the present invention, one end 2 of the copy paper 18
A detection switch 25 is provided for detecting that the guide piece 4 is in contact with the guide piece 23. The detection switch 25 is provided on or near the guide piece 23, and the actuator 26 of the detection switch 25 is swung by one end 24 of the copy paper 18 inserted along the guide piece 23. be done. The detection switch 25 is made conductive by the swinging of the actuator 26. This detection switch 25 is
It is arranged upstream of the paper feed roller 6 (lower in FIG. 6, right in FIG. 8, which will be described later).

Along the conveyance direction 5 of the copy paper 18, the guide piece 2
3, another detection switch 30 is provided on a virtual straight line along the transport direction 5 with respect to the detection switch 25. This detection switch 30 detects the copy paper 18 and becomes conductive. Detection switch 2
5 and 30 are arranged within a length range of the guide piece 23 along the copy paper conveyance direction. Distance l2 between the detection switches 25 and 30 along the conveyance direction 5 of the copy paper 18
is smaller than the maximum length of copy paper that can be copied.

FIG. 8 is a sectional view of the copy paper 18 including the insertion table 3 and the paper feed roller 6 along the conveyance direction 5. As shown in FIG. A detection switch 27 for detecting the copy paper 18 being transported is provided in front of the paper feed roller 6 in the copy paper transport direction. The distance l1 between the paper feed roller 6 and the detection switch 27 is equal to or larger than the maximum length l of the copy paper 18 that can be copied along the conveying direction 5 (l1≧l). As a supplementary explanation, the copy paper 18 is conveyed between the paper feed roller 6 and the detection switch 27 so that the copy paper 18 conveyed by the paper feed roller 6 reaches the detection switch 27. Means such as transport rollers are provided.

FIG. 9 is an electrical circuit diagram related to the detection switches 25, 27, and 30. Detection switch 25, 3
0 are connected in series. Detection switch 25, 30
conducts when its actuator is swung by the copy paper 18. The detection switch 27 is turned off when the copy paper 18 is detected. The detection switches 25 and 30 include an electromagnetic clutch 22 and a relay 28.
are connected in series. The self-holding switch 29 of the relay 28 and the detection switch 27 are connected in series, and this series circuit includes the detection switch 25,
30 in parallel.

When one end 24 of the copy paper 18 is inserted along the guide piece 23 of the insertion table 3, the detection switches 25 and 30 are electrically connected. Therefore, the electromagnetic clutch 22 is excited and turned on, and the rotational power from the chain 21 is transmitted to the paper feed roller 6. Therefore, the copy paper 18 is conveyed into the machine body 1 by the paper feed roller 6. When the detection switches 25 and 30 are turned on, the relay 28 is excited, and at the same time, the self-holding switch 29 is turned on.

When the copy paper 18 is being conveyed by the paper feed roller 6 and the trailing edge of the copy paper 18 is between the detection switch 25 and the paper feed roller 6, the detection switches 25 and 30 return to their original state. In order to continue conveying the copy paper 18 by the paper feed roller 6 even if it returns to the state and turns off, the detection switch 27 is activated.
is provided. The detection switch 27 is conductive when the copy paper 18 is not detected, and therefore the electromagnetic clutch 22 is energized. After the rear end of the copy paper 18 passes the paper feed roller 6,
The electromagnetic clutch 22 transmits the rotational power from the chain 21 to the paper feed roller 6 until the copy paper 18 turns off the detection switch 27.

These detection switches 25 and 30 detect the vicinity of the left end of the copy paper 18 along the conveying direction 5 in FIG. That is, by detecting the end portion along the transport direction 5 using at least two detection switches, it is possible to detect that the copy paper 18 is being transported parallel to the transport direction 5. Therefore, a configuration in which a plurality of detection switches are generally provided and the above operation is performed when at least two of the detection switches detect copy paper 18 is also included in the spirit of the present invention.

According to this embodiment, the detection switches 25, 30
The electromagnetic clutch 22 is turned on for the first time when both detect copy paper at the same time. These detection switches 25 and 30 detect the copy paper 18 when one end 24 of the copy paper 18 is guided along the guide piece 23. Therefore, even if the copy paper 18 is inserted diagonally with respect to the conveyance direction 5, the paper feed roller 6 is not driven, and diagonal feeding of the copy paper 18 is prevented.

As mentioned above, the electrostatic copying machine of this embodiment is
As shown in FIGS. 3 to 6, a guide piece 23 was provided on the upstream side of the conveying direction 5 with respect to the peeling claw 17. This guide piece 23 has detection switches 25 and 30 spaced apart from each other along the conveyance direction 5.
is provided.

Therefore, when the copy paper 18 is to be inserted into the machine body 1 using the insertion table 3, the one end 24 thereof is inserted along the guide piece 23. This results in
It is possible to reliably prevent the copy paper 18 from being conveyed diagonally.

Furthermore, by arranging the detection switches 25 and 30 as described above, when the copy paper 18 is about to be conveyed in the slanted state, the detection switches 25 and 30 are arranged as described above.
At least one of the paper sheets 30 is in a state where the one side edge 24 of the copy paper 18 is not detected. The electrostatic copying machine of the present invention is configured not to perform a copying operation in such a case, thereby preventing malfunctions such as malfunctions and paper jams caused by the diagonal conveyance.

The detection switches 25, 27, 30 may be photoelectric elements or the like. As yet another embodiment of the present invention, the present invention may be implemented to prevent copy paper from adhering not only to the photosensitive drum but also to a rotary body for copy processing such as a fixing roller.

As described above, according to the present invention, unless one side edge of the copy paper is manually fed along the guide piece, the copy paper conveyance means is not activated, and the copy paper is passed with one side edge aligned. Copy paper is conveyed only when it is manually fed along the guide piece.
Therefore, paper jams and skewed paper feeding do not occur.

In particular, in the present invention, the plurality of first detection elements 25, 3
0 is provided close to the guide piece 23 and on an imaginary straight line on the upstream side of the copy paper conveyance means 6, and is arranged within the length range of the guide piece 23 along the copy paper conveyance direction. Therefore, guide piece 2 guides one side edge of the copy paper.
3, the copy paper can be immediately detected by the first detection elements 25, 30. Here, only when at least two first detection elements 25, 30 detect one side edge of the copy paper, the copy paper conveying means 6 is activated. In this way, paper jams and skewed paper feeding can be prevented. Further, since it can be immediately determined whether copy paper has been properly manually fed, operability is improved.

In addition, in the present invention, one side edge of the copy paper is attached to the guide piece 2.
Since the copy paper is manually fed into the machine body along the line 3, it is easy to appropriately manually feed the copy paper, thereby improving operability.

Furthermore, in the present invention, the plurality of first detection elements 2
When one side edge of the copy paper is detected by the copy paper 5 and 30, the copy paper conveyance means 6 is activated to convey the copy paper and start copying. Therefore, the operator can concentrate on feeding the copy paper while aligning one end of the copy paper along the guide piece 23, and can reliably feed the copy paper appropriately. Therefore, as described in connection with the prior art described above, the present invention does not require the complicated operation of operating the print button while manually feeding paper. In this way, with the present invention, copy paper can be fed appropriately,
Moreover, operability is improved.

Furthermore, in the present invention, the first detection elements 25, 3
0 is provided upstream of the copy paper conveyance means 6, and the copy paper conveyance means 6 is operated only when one side edge of the copy paper is detected by at least two first detection elements 25, 30. Ru. Therefore, the first
When the copy paper is passed between the paper feed rollers 37 in the prior art described above with reference to the drawing, there is no fear that wrinkles will be formed on the copy paper, and the manual paper feed can be performed smoothly. be able to.

Furthermore, in the present invention, the first detection elements 25, 3
0, a second detection element 27 is provided, and the second detection element 27 is provided.
The distance l1 between the detection element and the copy paper transport means 6 is set to a distance greater than or equal to the maximum length of copy paper that can be copied. This achieves the effect of simplifying the construction. If the second detection element 27
A timer measures the time from when the leading edge of the copy paper is detected until the trailing edge of the copy paper passes the copy paper conveyance means 6. If the copy paper conveyance means 6 is configured to be inactive, a timer will be required and the configuration will be complicated. In the present invention, since the second detection element 27 is provided and the distance l1 as described above is provided, a timer is not required and the configuration is simple.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of copying paper according to an embodiment of the present invention;
2 is a simplified perspective view showing the conveyance path of the copy paper 18, FIG. 3 is a plan view of the vicinity of the photosensitive drum 8, and FIG. 4 is a perspective view of the photosensitive drum 8 seen from the discharge side in the copy paper conveyance direction 5. 5 is a side view of the photosensitive drum 8, FIG. 6 is a plan view of the insertion table 3 and paper feed roller 6, FIG. 7 is an end view taken along the cutting plane line - of FIG. 6, and FIG. FIG. 9 is a sectional view along the conveying direction 5 including the insertion table 3 and the paper feed roller 6, FIG. 9 is an electric circuit diagram of an embodiment of the present invention, and FIG. 10 is a simplified sectional view of the prior art. DESCRIPTION OF SYMBOLS 1... Machine body, 3... Insertion stand, 4... Reception plate, 5... Conveyance direction, 7... Copy paper conveyance means, 8... Photosensitive drum, 9
...Transfer device, 15...Peeling area, 17...Peeling claw, 18
...Copy paper, 22...Electromagnetic clutch, 23...Guide piece, 24...One side end of copy paper 18, 25, 27, 3
0...Detection switch.

Claims (1)

[Claims for Utility Model Registration] A method for manually feeding copy paper into the machine by aligning one side edge of the copy paper with a guide piece 23 provided at the side end of the manual insertion table 3 of an electrostatic copying machine, and copy paper conveying means 6 In an electrostatic copying machine that transports copy paper by
The copy sheets are arranged within a length range along the copy paper transport direction, and are spaced apart from each other by a distance l2 smaller than the minimum length of the copy paper that can be copied on a virtual straight line along the paper feeding direction 5, and the copy paper a plurality of first detection elements 25, 30 for detecting the one side end of the copy paper conveying means 6; When at least two of the second detection element 27 and the first detection elements 25 and 30, which are arranged at a distance from each other and detect the copy paper, detect the one side edge of the copy paper, drive the copy paper conveying means 6; control means 28 and 29 for disabling the copy paper conveyance means 6 when the second detection element 27 detects copy paper; and conveying the copy paper conveyed from the copy paper conveyance means 6 to the second detection element 27. 1. An electrostatic copying machine comprising means for: