JPS6283945A - Paper feeder - Google Patents

Abstract

PURPOSE:To properly supply recording paper of desired size, by displaying a corresponding position, in accordance with an output signal calculating a use size, on a hand feed tray on the basis of a detection signal from a document size detecting means and a projection magnification assignment signal from an input means. CONSTITUTION:Copying action, forming a picture on recording paper, is started, and when no corresponding cassette is discriminated, a size of the recording paper to be supplied to a picture forming part is calculated in a control means 37 on the basis of a picture projection magnification assignment signal, output from an input means 36, and a signal of a document size detecting means. And a device, outputting from the control means 37 a display signal to a display means 35 of a hand feed tray 17 while lighting a light emitting diode 34 to display a paper feed position, sets side end restricting plates 33, 33 to a display position while supplies the recording paper with the plates 33, 33 serving as the reference, then the device, starting the copying action forming a picture on the recording paper supplied from the hand feed tray 17, finishes control action. In this way, the recording paper in size corresponding to the picture can be easily further properly supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvements in paper feeding devices in image forming apparatuses such as copying machines and printers.

(Prior Art) Conventionally, in an image forming apparatus equipped with a variable magnification function that changes the image projection magnification, an image forming apparatus is used according to an original size signal and a copy magnification signal, as shown in Japanese Patent Application Laid-open No. 54-126041, for example. Some devices are configured to calculate the size of recording paper to be loaded, select a paper feed cassette containing recording paper of the corresponding size, and automatically feed the paper. A conventional device with this configuration automatically selects a paper cassette containing recording paper of the size closest to the above size when a paper cassette containing recording paper of the corresponding size is not installed in the machine. Although it is easy to operate, it does not always select the desired size of recording paper, which may result in the image being out of size or leaving more blank space on the recording paper than necessary. There is a risk of Additionally, a warning sound is generated to prompt the user to install a paper cassette containing recording paper of the appropriate size.
In this case, there is a problem in that the paper feed cassette must be replaced every time even during single-shot copying, which is a complicated operation.

(Object of the Invention) The present invention has been made to solve the above-mentioned problems, and is an image forming method that can easily and appropriately supply recording paper of a desired size while preventing the image from running out of size. The purpose is to obtain a paper feeding device for an apparatus.

(Structure of the Invention) A first gist of the present invention is a paper feeding device equipped with a manual feed tray that manually feeds recording paper, including input means for specifying an image projection magnification and document size detection means for detecting the size of the document. and a control means for calculating the size of the recording paper to be used based on the detection signal output from the document size detection means and the projection magnification designation signal output from the input means, and the output from the control means A display means is provided on the manual feed tray for displaying the feeding position corresponding to the width size of the recording paper in response to a signal.

With this configuration, recording paper of a size corresponding to the image can be easily and appropriately supplied based on the position displayed on the display means.

A second gist of the present invention is a paper feeding device equipped with a manual tray for manually feeding recording paper, which includes an input means for specifying an image projection magnification, an original size detection means for detecting the size of the original, and an input means for specifying an image projection magnification; and a control means for calculating the size of the recording paper to be used based on the detection signal output from the original size detection means and the projection magnification designation signal output from the input means, and is movable in the width direction of the recording paper. The manual feed tray is provided with a side edge regulating plate and a driving means for moving the side edge regulating plate to a position corresponding to the width size of the recording paper in response to an output signal from the control means.

With this configuration, the side edge regulating plate of the manual feed tray is automatically installed at a predetermined position according to the recording paper size calculated based on the original size and image projection magnification, and the image is imaged with this side edge regulating plate as a reference. It is possible to easily and appropriately supply recording paper of a size corresponding to the size of the paper.

(Embodiment) FIG. 1 shows a schematic diagram of an electrostatic copying machine equipped with a paper feeding device according to the first invention. Above this electrostatic copying machine, a document mounting table 3 consisting of a document presser 1 and a contact glass 2 is provided, and below it, a document irradiation lamp 4, reflecting mirrors 5, 6°7, and a lens 8 are provided. An optical system section 9 is provided. Further, in the center of the body, a photosensitive drum 10, a main charging device 11, a developing device 12, a transfer charging device 12a1, a separation charging device 12b1, a cleaning device @
13, an image forming section 15 equipped with a static elimination lamp 14, etc. is formed, and a paper ejection tray 16 is provided on the left side of the machine body in the figure, and a manual feed tray 17 and paper feed cassettes 18 and 19 are provided on the right side. A paper feed section 20 is provided.

The recording paper fed from the paper feed section 20 via the paper feed roller 20a and the conveyance roller 20b is supplied to the image forming section 15 via the conveyance mechanism 24 consisting of registration rollers 21, guide plates 22, and pre-transfer rollers 23. Thereafter, the sheet is discharged onto the paper discharge tray 16 via a discharge bridge 28 consisting of a conveyor belt 25, a fixing roller 26, a discharge roller 27, and the like.

Further, below the contact glass 2, a document size detecting means 30 consisting of a plurality of photosensors 29 is disposed, and each photosensor 29 detects the size of the document on the contact glass 2.
The document size is detected by detecting the trailing edge of the document placed above. Each of the photosensors 29 is disposed facing the lower surface of the contact glass 2 at a predetermined inclination angle in order to prevent malfunction due to reception of reflected light from the contact glass 2. In addition, in order to prevent the two photosensors from malfunctioning due to reception of reflected light from the bottom surface of the document presser 1 or incident light from the outside, it is necessary to close the document presser 1 immediately before closing the document presser 1 (for example, at an opening angle of approximately 150 degrees). It is desirable to control the detection means 3o so as to operate it.

As shown in FIG. 2, the manual feed tray 17 includes a tray main body 31 and a side edge regulating plate for recording paper supported so as to be slidable left and right along slide grooves 32 and 32 formed in the tray main body 31. 33, 33, and is configured to move the side edge regulating plates 33.degree. 33 in the width direction of the recording paper based on the center line according to the width size of the recording paper to be supplied. Further, the tray main body 31 is provided with a display means 35 consisting of a light emitting diode 34, etc., which displays the feeding position according to the size of the recording paper.

Further, an input means including a print key, an image projection magnification input key, etc. is provided on the top surface of the copying machine, and signals outputted from this input means 36 and the document size detection means 30 are input to the control means 37. be done. The control means 37 determines the size of the recording paper to be supplied to the image forming section 15 based on the image projection magnification designation signal outputted from the input means 36 and the original size detection signal outputted from the original size detection means 30. Calculated in .

This control means 37 generates a selection signal for selecting one of the paper feed cassettes 18 and 19 containing recording paper of a corresponding size, or a display means 35 of the manual feed tray 17.
The apparatus is configured to output a display signal indicating the installation position of the side edge regulating plate 33, ie, the feeding position of the recording paper.

In the above configuration, the control operation for automatically selecting and displaying the recording paper to be used or performing paper feeding control for supplying the recording paper will be explained based on the flowchart shown in FIG. first,
It is determined whether or not a paper feed cassette containing recording paper of the size calculated by the control means 37 is attached to the machine body (step S1). If it is determined that there is a corresponding cassette, a cassette selection signal is output from the control means 37 to the paper feed section 20 (step 82). Then, the recording paper is fed out from the cassette (
In step S3), a copying operation for forming an image on this recording paper is started (step 84).

If it is determined in step S1 that there is no corresponding cassette, a display signal is output from the control means 37 to the display means 35 of the manual feed tray 17 (step S5), and the light emitting diode 34 is turned on. The paper feeding position is displayed (step S6). Then, the side edge regulating plate 33.33 is installed at the position indicated by the light emitting diode 34, and the recording paper is fed based on this side edge regulating plate 33.33, and is fed from the manual feed tray 17. A copying operation for forming an image on recording paper is started in step S4, after which the control operation ends.

In this way, the display means 35 is provided on the manual feed tray 17,
Since the feeding position of the recording paper to be fed is displayed, the side edges pAi, lJ plate 33 .
33 can be installed to manually feed recording paper.

Therefore, if a paper cassette containing recording paper of the size to be used is not installed in the machine, the trouble of replacing the paper supply cassette each time can be saved, and it can also accommodate recording paper of an approximate size unlike conventional devices. It is possible to prevent the occurrence of out-of-size images due to selection of a paper feed cassette, and to easily and appropriately supply recording paper. Particularly when performing one-shot copying in which an image is formed on a single sheet of recording paper, it is extremely convenient because the complicated operation of replacing the cassette can be omitted.

Note that when performing continuous copying in which images are formed on a large number of recording sheets, it is not necessarily necessary to feed the recording sheets from the manual feed tray 17, but a cassette is selected based on the display position of the display means 35, and the cassette is may be attached to the aircraft.

FIG. 4 shows main parts of an embodiment of a paper feeding device according to the second invention,
In other words, it shows the manual feed tray 17 viewed from the bottom. This paper feeding device is used instead of the display means 35 or together with the recording paper side edge regulating plates 33, 33.
The recording paper feeding apparatus is provided with a driving means 38 for moving the recording paper to a position corresponding to the width size of the recording paper used, and the other parts are constructed in the same manner as the paper feeding apparatus according to the first aspect of the invention. That is, this driving means 38 has screws 3 on the lower surface of the side end regulating plate 33.33.
The stepper motor 43 includes a rack 40.41 which is fixedly fixed to the rack 40.41 below the tray body 31, and a stepping motor 43 having a pinion 42 which is engaged with the rack 40.41. Then, the stepping motor 43 rotates a predetermined number of times in accordance with the output signal output from the control means 37, so that the side end regulating plate 3
3.33 is configured to be moved to a position corresponding to the recording paper.

In the paper feed device with this configuration, when the paper feed cassette containing the recording paper to be used is not installed in the machine, the side edge regulation plates 33 and 33 are positioned at positions corresponding to the width size of the recording paper to be used. It is installed automatically via the drive means 38. Therefore, it is possible to easily and appropriately supply recording paper of a size corresponding to the image based on the position of the side edge regulating plates 33, 33.

In the above embodiment, a center-based type paper feeding device that feeds the recording paper based on the center line has been described, but the present invention is a one-sided paper feeding device that feeds the recording paper based on one side of the paper. The same applies to types. Furthermore, a stepping motor 43 is used as the driving means 38 for the side end regulating plate 33, and by controlling the rotation speed of this motor 43, the side end regulating plate 33 is moved to a predetermined installation position. A reed switch may be arranged at a position corresponding to the size of the paper, and the installation position of the side end regulating plate 33 may be controlled by this switch.

Further, in the case where the document feeder is provided with a document feeder that automatically feeds the document onto the contact glass 2, the document feeder may be provided with document size detection means.

That is, as shown in FIG. 5, a side edge detection sensor 5 is attached to a side edge regulating plate υ1 and is disposed so as to be movable left and right.
0.50 to detect the side edges of the document, and detect the width of the document by calculating the distance between both side edge detection sensors 50° and 50, and also detect the front and rear edges of the document. A document size detection unit may be provided that calculates the length of the document by detecting the document conveyance time in accordance with the output signal from the feed detection sensor 51. By providing a document size detection means in the document feeder in this way, even when a document of a special size that is not standard is fed from the document feeder, the size of the document can be accurately detected, and the size of the document can be detected accurately. and the image projection magnification input from the input means 36, the manual feeding position of the recording paper can be accurately displayed, or the side edge regulating plate 33 can be installed at a predetermined position. be.

(Effects of the Invention) As explained above, the first invention provides means for controlling the size of recording paper to be used based on the detection signal output from the document size detection means and the image projection magnification designation signal output from the input means. Since the feeding position of the recording paper is displayed by the display means in accordance with the output signal from the control means, the recording paper of the size corresponding to the image can be easily and appropriately fed according to this display position. This has the advantage that the complicated operation of replacing the paper feed cassette each time during single-shot copying can be omitted, and it is also possible to prevent images from running out of size.

Further, in the second aspect of the invention, the side edge regulating plate of the manual feed tray is moved by the drive means to a position corresponding to the width size of the recording paper to be fed in accordance with the output signal from the control means. It is possible to easily and appropriately supply recording paper of a size corresponding to an image based on the edge regulating plate.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing an embodiment of the present invention, Fig. 2 is a plan view showing main parts of the first invention, Fig. 3 is a flowchart showing control operation, and Fig. 4 is a main part of the second invention. a perspective view showing the part;
FIG. 6 is a perspective view showing another example of actual droplets after the document size detection means of FIG. 5; 170.・Manual feed tray, 20...Paper feed section, 30...
・Document size detection means, 33...side edge regulation plate, 35・
...Display means, 36...Input means, 37...Control means, 38...Driving means. Patent applicant Agent: Sanda Kogyo Co., Ltd.
Patent Attorney Etsushi Kotani Patent Attorney Cho 1) Masamukai Patent Attorney Yasuo Itaya Figure 2 30 32 3':)

Claims (1)

[Claims] 1. In a paper feeding device equipped with a manual tray for manually feeding recording paper, an input means for specifying an image projection magnification, an original size detection means for detecting the size of an original, and this original size detection control means for calculating the size of the recording paper to be used based on the detection signal output from the means and the projection magnification designation signal output from the input means; A paper feeding device characterized in that a display means for displaying a feeding position corresponding to a width size of the sheet is provided on a manual feed tray. 2. In a paper feeder equipped with a manual feed tray that manually feeds recording paper, an input means for specifying an image projection magnification, an original size detection means for detecting the size of the original, and a detection output from the original size detection means a control means for calculating the size of the recording paper to be used based on the signal and the projection magnification designation signal output from the input means, a side edge regulating plate movable in the width direction of the recording paper; and the control means A paper feeding device characterized in that the manual feed tray is provided with a driving means for moving the side edge regulating plate to a position corresponding to the width size of the recording paper in accordance with an output signal from the paper feeder.