JPS63213831A - Automatic magnification setting device for image forming device - Google Patents

Abstract

PURPOSE:To form a correct image without the occurrence of scant size for the image or the like by calculating the projection magnification of an image in a control means based on detection signals outputted from a recording paper size detecting means and an original size detecting means. CONSTITUTION:An original size detecting means 30 detects the original size, and a recording paper size detecting means 36 detects the size of a manually fed recording paper. If the recording paper size is standard, the standard size is discriminated; but if it is nonstandard, a smaller standard size is discriminated. Since a control means 43 calculates the projection magnification of the image in accordance with sizes of the manually fed recording paper and the original to form the image, a correct image is easily formed without the occurrence of scant size for the image or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic magnification setting device for 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, as shown in Japanese Patent Application Laid-Open No. 57-185060, a document size detection signal and a record in a paper feeding power centimeter are used. Some devices are configured to calculate the projection magnification of an image according to a paper size detection signal and automatically perform a magnification change operation.

(Problems to be Solved by the Invention) In the conventional apparatus with this configuration, no consideration is given to the case where recording paper is fed from the manual feed tray, and therefore, when the size of the manually fed recording paper and the original document are different, The operator has to calculate the projection magnification of the image, which is complicated, and there are problems in that the image may be out of size due to calculation errors, or an unnecessarily large margin may be formed in the recording area.

The present invention has been made to solve the above-mentioned problems, and eliminates the need for the complicated operation of calculating the projection magnification of an image when feeding recording paper from a manual feed tray, and also eliminates the need for image projection magnification due to calculation errors. It is an object of the present invention to provide an automatic magnification setting device for an image forming apparatus that can prevent out-of-size etc. from occurring.

(Means and effects for solving the problems) The present invention has the following features:
An automatic magnification setting device for an image forming apparatus equipped with a manual feed tray for manually feeding recording paper, comprising: a document size detection means for detecting the size of a document; and a document size detection means for detecting the size of the recording paper fed from the manual feed tray. The recording paper size detection means is equipped with a plurality of detection switches arranged corresponding to the recording paper of various standard sizes, and when the recording paper of the standard size is supplied, the recording paper of the standard size is detected. It determines that it is paper and outputs a recording paper size signal, and if a non-standard size recording paper is supplied, it is assumed that it is a recording paper of the smaller standard size that is close to the non-standard size, and the recording paper is It is characterized by comprising a recording paper size detection means for outputting a paper size signal, and a control means for calculating a projection magnification of an image according to the detection signals output from the original size detection means and the recording paper size detection means. It is something to do.

With the above configuration, the document size detection means detects the document size, and the recording paper size detection means detects the size of manually fed recording paper. At this time, if the recording paper is a standard size, it is determined to be the corresponding size, and if the recording paper is a non-standard size, it is considered to be a smaller standard size recording paper, and it is determined to be the recording paper size. . Then, the control means calculates the projection magnification of the image corresponding to the size of the manually fed recording paper and the document, and forms the image.
It is possible to form an appropriate image without causing the image to be out of size or the like.

(Embodiment) FIG. 6 shows a schematic diagram of an electrostatic copying machine (hereinafter simply referred to as a copying machine) according to an embodiment of the present invention. A document R stand 3 consisting of a document holder 1 and a contact glass 2 is provided above the body of this copying machine, and below it is an optical system section consisting of a document irradiation lamp 4, reflectors 5, 6, 7, and a lens 8. 9 are arranged. Further, an image forming section 15 is formed in the center of the body, which includes a photosensitive drum 10, a main charging device 11, a developing device 12, a transfer charging device 12a, a separation charging device 12b, a cleaning device 13, a static elimination lamp 14, etc. In the figure, a discharge tray 16 is provided on the left side of the machine body, and a paper feed section 20 consisting of a manual feed tray 17 and paper feed cassettes 18 and 19 is provided on the right side.

The recording paper is supplied from the paper feed section 20 via the paper feed roller 20a and the conveyance roller 20b, and is supplied to the image forming section 15 via the conveyance mechanism 24, which includes a registration roller 21, a guide plate 22, and a pre-transfer roller 23. Thereafter, it is configured to be discharged onto the discharge tray 16 via a discharge mechanism 28 that includes a conveyance belt 25, a fixing roller 26, a discharge roller 27, and the like.

Further, below the contact glass 2, an original size detecting means 30 consisting of a plurality of photosensors 29 is disposed, and each photosensor 29 detects the rear end of the original A placed on the contact glass 2. The document size is detected by detecting the copy. Each of the photosensors 29 is disposed facing the lower surface of the contact glass 2 at a predetermined angle of inclination in order to prevent malfunctions due to reception of reflected light from the contact glass 2.

In addition, in order to prevent the photosensor 29 from malfunctioning due to reception of reflected light from the lower surface of the document holder 1 or incident light from the outside, the photo sensor 29 should be placed immediately before closing the document holder 1 (for example, at an opening angle of about 15 degrees). It is desirable to control the detection means 30 to operate.

As shown in FIG. 2, the manual tray 17 includes a tray body 31 and a slider formed on the tray body 31. recording paper side edge regulating plates 33 and 33 supported so as to be slidable left and right along the i32, 32, and the side edge regulating plates 33 and 33 are arranged with respect to the center line according to the width size of the recording paper to be supplied. It is configured to move 33 degrees 33 in the width direction of the recording paper. Further, the tray main body 31 is provided with a front end switch 34a and a rear end switch 34b as recording paper detection switches consisting of limit switches (or photo sensors, etc.) on the upstream and downstream sides of the recording paper feeding direction of the approximately center line. It is being

FIG. 1 shows the manual feed tray 17 viewed from the bottom. This manual feed tray 17 has a side end regulating plate 33.
33 to a position corresponding to the width size of the recording paper, and detecting means 3 for detecting the size of the recording paper.
6 is installed.

That is, this driving means 35
A rack 38 is fixed to the lower surface of the tray body 31 with screws 37 and 37, and is disposed below the tray body 31.
．． 39 and a pinion 40 engaged with this rack 38,39. The side end regulating plates 33, 33 are configured to move in parallel in opposite directions via this pinion 40, and are positioned with the recording paper in between. still,
It goes without saying that in the case of a single-side reference type feeding device, a configuration in which only one side end regulating plate is moved may be used. The detection means 36 includes a magnet 41 disposed on either side of the rack 38°390, and reed switches R1, R2°R3 disposed on the tray body 31 side so that the detection surface faces the magnet 41. , R4. Then, the side end regulating plate 3 is inserted through the racks 38, 39 and the pinion 40.
As the magnet 41 moves 3 degrees 33, the detection switch 7 R1 is attached to a predetermined position according to the recording paper.
, R2, R3, and R4.

The means for detecting the size of recording paper in the manual feed tray 17 having the above configuration will be explained based on the flowchart shown in FIG. In this embodiment, for example, when the magnet 41 is in a position just opposite the detection switch R1 in FIG.
The description will be made assuming that the detection switch R2 corresponds to the width of B5R according to the IS standard, and similarly, the detection switch R2 corresponds to the A4R, the detection switch R3 corresponds to the B5, and the detection switch R4 corresponds to the A4. Also, when the side edge of the recording paper is located between adjacent switches, the detection switch close to it is turned ON.
The performance of the detection switches R1 to R4 and the magnet 41 are adjusted so that
The position of is set.

First, the presence or absence of recording paper is determined by the tip switch 34a, and the
The following detection is performed in the N state (step Sl). That is, in step S2, it is determined whether the rear end switch 34b is in the ON state. If it is in the ON state, it is determined that the paper is a large-sized recording paper, and the process proceeds to step S3.

In step S3, it is determined whether the detection switch R4 is in the ON state, and if it is in the ON state, the process advances to step S4. In step S4, it is determined whether or not the detection switch R3 is in the ON state. If it is in the OFF state, it is determined in step S5 that the recording paper size is A3 size, and a recording paper size signal is output. At this time, the magnet 41 is located exactly opposite the detection switch R4, and the rear end switch 34b is detecting the presence of recording paper.

The detection switch R4 is in the ON state in step S3, and the detection switch R3 is in the ON state in step S4! If it is in the pus, in step S6, it is assumed to be B4 size, which is the smaller size nearby, and a recording paper size signal is output. At this time, the magnet 41 is in a position intermediate between the detection switch R4 and the detection switch R3, and the rear end switch 34b is detecting the presence of recording paper.

When the detection switch R4 is in the OFF state with the steering knob S3, the process advances to step S7, and the detection switch R3 is set to ○Na''.
It is detected whether the device is in the Detection switch R3 is O
If it is in the N state, the recording paper size is determined to be B4 in step s8, and a recording paper size signal is output. At this time, the magnet 41 is in a position exactly opposite the detection switch R3, and the rear end switch 34b is detecting the presence of recording paper.

In step S3, the detection switch R4 is in the OFF state,
If the detection switch R3 is in the OFF state in step S7, the recording paper size detection operation ends.

Returning to step S2 again, the rear end switch 34b is turned OFF.
If it is in the F state, the recording paper size is relatively small, and the process advances to step S9.

In step S9, it is determined whether the detection switch R4 is in the ON state, and if it is in the ON state, the process proceeds to step SIO.

Then, in step SIO, it is determined whether the detection switch R3 is in the ON state, and if it is in the OFF state, step SIO is performed.
At 1, the recording paper size is determined to be A4, and a recording paper size signal is output. At this time, the magnet 41 is connected to the detection switch R.
4, and the rear end switch 34b
does not detect the presence of recording paper.

If the detection switch R4 is in the ON state in step S9 and the detection switch R3 is in the ON state in step SIO, in step 512, the recording paper size is assumed to be B5 size, which is the adjacent smaller size, and the recording paper is Outputs paper size signal. At this time, the magnet 41 is between the detection switch R4 and the detection switch R3, and the rear end switch 34b is not detecting the presence of recording paper.

If the detection switch R4 is in the OFF state in step S9, the process proceeds to step 513, and in step S13 it is determined whether the detection switch R3 is in the ON state. If the detection switch R3 is in the ON state, the process advances to step S14, where it is determined whether the detection switch R2 is in the ON state. If the detection switch R2 is in the OFF state, the recording paper size is determined to be 85 size in step S15. At this time, the magnet 41 is located exactly opposite the detection switch R3, and the rear end switch 34b is not detecting the presence of recording paper.

In step S13, the detection switch R3 is in the ON state,
If the detection switch R2 is in the ON state in step S14, the recording paper size is assumed to be A4R size, which is the adjacent smaller recording paper size, in step S16.
Outputs the recording paper size signal. At this time, the magnet 4I is
Located between detection switch R3 and detection switch 7-chi R2,
The rear end switch 34b does not detect the presence of recording paper.

When the detection switch R3 is in the OFF state in step S13, the process advances to step S17, and in step S17 it is determined whether the detection switch R2 is in the ON state.

If the detection switch R2 is in the ON state in step S17, the process proceeds to step 318, where it is determined whether the detection switch R1 is in the ON state. If the detection switch R1 is in the OFF state in step S18, the recording paper size is determined to be A4R in step S19, and a recording paper size signal is output. At this time, the magnet 41 is just facing the detection switch R2, and the rear end switch 34b is not detecting the presence of recording paper.

In step S17, the detection switch R2 is in the ON state,
If the detection switch R1 is in the ON state in step 318, in step S20, the recording paper size is determined to be BSR size, which is the smaller adjacent recording paper size, and a recording paper size signal is output. At this time, the magnet 41 is connected to the detection switch R2.
and the detection switch R1, and the rear end switch 34b does not detect the presence of recording paper.

If the detection switch R2 is in the OFF state in step S17, the process advances to step 521, and the detection switch R1 is in the ON state.
It is determined whether the condition exists or not.

If the detection switch R1 is in the ON state, step S22
In this step, the recording paper size is determined to be B5R, and a recording paper size signal is output. At this time, the magnet 41 is in a position just opposite the detection switch R1, and the rear end switch 3
4b does not detect the presence of recording paper.

If the detection switch R1 is in the OFF state in step S21, the series of recording paper size detection operations is ended.

In this way, in the recording paper size detection means 36, when the side edge regulating plate 33. When the recording paper is of a special size, the closest smaller standard size is regarded as the recording paper size, and a recording paper size signal is output.

In FIG. 3, detection signals outputted from the recording paper size detection means 36, original size detection means 30, and cassette detection means 20C for detecting the recording paper size in the paper feed cassette are input to the control means 43. The control means 43 calculates the projection magnification of the image, and outputs a control signal to the lens 8 of the optical system section 9 according to this value.
This lens 8 is set to a predetermined magnification.

In the above configuration, the control operation when performing automatic magnification setting control will be explained based on the flowchart shown in FIG. 5. First, it is determined whether or not to manually feed the recording paper to be used from the manual feed tray 17 (step TI
). And paper feeding power cent 18.1 instead of manual feeding
If it is determined that the paper is automatically fed from 9, the size of the recording paper accommodated in the selected cassette is output from the cassette detecting means 20C based on the copy button ON signal (step 'r2).

Further, if it is determined in step T1 that manual feeding is to be performed, based on the copy button ON signal,
The recording paper size detection means 36 detects the recording paper size and outputs the value to the control means 43 (step T
3). In this control means 43, the recording paper size detection means 36 or the paper feeding power center 181, 19
The projection magnification of the image is calculated based on the recording paper size output from the recording paper size and the document size output from the document size detection means 36 (step T4). Thereafter, a control signal is output from the control means 43 to the lens 8, and the lens 8
The magnification is set (step T5), and the copying operation for forming an image on the recording paper according to this magnification is started (step T6). In this way, the recording paper size detection means 36 is provided in the manual feed tray 17, Since the projection magnification of the image is calculated in the control means 43 based on the signal values output from the detection means 36 and the document size feed means 30 provided opposite to the lower surface of the contact glass 2, the recording paper Even when the image is manually fed, an appropriate image can be easily formed without causing the image to be out of size.

Moreover, in image forming apparatuses, when the size of the recording paper is A size or B size according to the JIS standard, the magnification ratio is constant, so it is easy to select the magnification ratio. Even when manually feeding recording paper of a special size other than the standard, the image projection magnification can be easily and accurately set without the need for troublesome calculations of magnification because it is treated as the closest standard size. The advantage is that it can be done.

Incidentally, in the above embodiment, a center reference type feeding device was described which supplies the recording paper with reference to the center line, but the present invention is a one side reference type feeding device which supplies the recording paper with an example of a side portion of 5i1J. is similarly applicable.

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. 6, a side edge detection sensor 50 is attached to a side edge regulating plate or the like and is disposed so as to be movable left and right.
．． 50 to detect the width of the document by calculating the distance between the side edge detection sensors 50 and 50, and detect the front and rear edges of the document. A document size detection means may be provided that calculates the length of the document by means such as detecting the document conveyance time according to the output signal from the detection sensor 51. In this way, when the document feeder is provided with the document size detection means, the document size can be accurately detected even when a document of a special size outside the standard is fed, and this document size and There is an advantage that the image projection magnification can be easily and accurately set according to the recording paper size detected by the recording paper size detection means 35.

Furthermore, since the manual feed tray 17 is provided with detection switches R1 to R4 and the recording paper size detection means 36 for detecting the recording paper size as described above is provided, the recording paper corresponding to the document size is selected based on the set projection magnification. , manual feed tray 17
It is also possible to automatically select and supply recording paper from among the paper feed cassettes 18 and 19.

(Effects of the Invention) As described above, the present invention provides detection signals output from the recording paper size detection means provided in the manual feed tray and the document size detection means provided opposite to the lower surface of the contact glass. Since the projection magnification of the image is calculated by the control means based on the image projection magnification, the image does not run out of size even when feeding recording paper manually (and an appropriate image can be easily formed). .Also,
Even when manually feeding recording paper of a special size other than the standard, use the smaller JIS closest to the recording paper.
Since the size of the standard recording paper is assumed, it is very easy to select the variable magnification, and the image projection magnification can be easily and accurately set.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of the manual feed tray according to the present invention as seen from the bottom, Fig. 2 is a plan view of the manual feed tray according to the present invention, Fig. 3 is a block diagram, and Fig. 4 is the recording paper size. FIG. 5 is a flowchart showing the control operation when performing automatic magnification setting control, FIG. 6 is a schematic diagram showing an embodiment of the present invention, and FIG. 7 is a flowchart showing the control operation for detecting the document size. FIG. 3 is a perspective view showing another embodiment of the device. 17... Manual feed tray 30... Document size detection means 36... Recording paper size detection means 43... Control means

Claims (1)

[Scope of Claim] An automatic magnification setting device for an image forming apparatus equipped with a manual feed tray that manually feeds recording paper, comprising a document size detection means for detecting the size of a document, and recording paper fed from the manual feed tray. A recording paper size detection means for detecting the size of recording paper, comprising a plurality of detection switches arranged corresponding to recording paper of various standard sizes, and when a recording paper of standard size is supplied. , determines that the recording paper is of the standard size and outputs a recording paper size signal, and if non-standard size recording paper is supplied, outputs the recording paper of the smaller standard size that is close to the non-standard size. a recording paper size detection means for outputting a recording paper size signal; and a control means for calculating an image projection magnification according to the detection signals output from the original size detection means and the recording paper size detection means. 1. An automatic magnification setting device for an image forming apparatus, characterized in that: