JPS58179856A - Electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To make operation of transfer paper designation switches unnecessary, by selecting one of plural transfer paper feed means in accordance with the output signal of an original size sensor and that of a variable power ratio designating circuit, and actuating it. CONSTITUTION:The titled copying machine is provided with original size sensors 16, 17 for detecting size of originals 2 placed on the original set tray 1 of an original feeder, a variable power ratio designating circuit operated with plural variable power ratio designating switches for designating copying magnification of an exposing device 13, and means for causing a variable power ratio changing means to decide a variable power ratio in accordance with the output signal of the variable power ratio designating circuit, and in addition, means for selecting and actuating one of plural transfer paper feeding means 31 in accordance with the output signals of the sensors 16, 17 and that of the variable power ratio designating circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic copying machine that copies an image of a document onto transfer paper.

Conventionally, there has been a document feeding device that can feed originals, an exposure device that has a variable magnification ratio changing means that can change the copying magnification, and transfer paper cassettes of multiple different sizes that correspond to the size. The transfer paper cassettes accommodate transfer paper of the same size, and the transfer paper in these transfer paper cassettes is fed by separate transfer paper feeding means.

In an electronic copying machine equipped with a transfer paper feeding device capable of controlling means for causing the variable magnification ratio changing means to determine the variable magnification ratio; a transfer paper designation circuit operated by a plurality of transfer paper designation switches for designating one of a plurality of different sizes of transfer paper; An electronic copying machine is known which has means for operating a designated one of a plurality of transfer paper feeding means based on an output signal of a paper designation circuit.

However, this electronic copying machine has the drawback that the operator must determine the appropriate size of transfer paper based on the thickness of the original and the variable magnification ratio, and then operate the transfer paper selection switch. be.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic copying machine that can eliminate the above-mentioned drawbacks.

The present invention is characterized by a document size sensor that detects the size of the document placed on the document set tray of the document feeder, and a plurality of magnification ratio designation switches that specify the copying magnification of the exposure device. a magnification ratio designating circuit; a means for causing a magnification ratio changing means to determine a magnification ratio based on an output signal of the magnification ratio designation circuit; and an output signal of the document size sensor and an output of the magnification ratio designation circuit. The present invention also includes means for selecting and operating one of the plurality of transfer paper feeding means based on the signal.

The present invention will be described in detail below based on the illustrated embodiments. In FIG. 1, reference numeral 1 indicates a document set tray. A document 2 is placed on the document set tray 1 with the image side facing down. A side guide 3 is provided so that it can be moved by hand in correspondence with the document setting. A side guide (not shown) is fixed to the document set tray 1 so as to face the side guide 3 at a predetermined distance. This side guide and the above side guide 3
This guides the document 2 on the document upper tray 1 when it is fed. A paper feed roller 4 is arranged in the middle of the document set tray 1 and on the side in the feeding direction of the document s2.

On top P, a platen 5 for placing the original 2 is arranged at a predetermined distance from the paper feed roller 4 .

Between the paper feed roller 4 and the platen 50, there is a separation roller 6 and a pinch roller (towards the feeding direction of the document 2).
7 is placed. Belt rollers 8, 8 are arranged on both sides of the platen 50, respectively, and a conveyor belt 9 is attached to these belt rollers 8. The document set tray 1, side guide 3, paper feed roller 4, separation roller 6, pinch roller 7, belt roller 8, and transport belt 9 constitute a document feeder lO that feeds the document 2 onto the platen 5. There is.

On the side of the platen 5 in the direction in which the document 2 is discharged, a stopper 11 is disposed below the conveyance belt 9 so as to be movable along the conveyance path of the document 2. This stopper 11 is disposed on the conveyance path of the document 2 by a solenoid and stops the document 2 only when necessary. A document discharge tray 12 is arranged on the side of the platen 5 in the direction in which the document 2 is discharged, at a predetermined distance from the tray 11. The original discharge tray 12 is provided with a stop plate 12a for stopping the original 2 so as to be movable in accordance with the size of the original 2.

The document 2 placed on the document tray 1 is sent to the separation roller 6 by the rotational force of the paper feed roller 4, and these separation rollers 6 only feed the document 2 at the lowest position. The other documents 2 are also separated and sent toward the pinch roller 7. These pinch rollers 7 feed the original 2 between the platen 5 and the conveyor belt 90, and the conveyor belt 9 conveys the original 2 along the platen 5.

The document 2 conveyed by the conveyance belt 9 is stopped for a predetermined period of time by a stopper 11 located on the conveyance path, and is brought to rest on the platen 5.

The driving force to the conveyor belt 9 is applied to the original 2 at the stopper 11.
It is cut off just before it is stopped. An exposure device [13] and a drum-shaped photoreceptor 14 are arranged below the platen 5. Image light from the document 2 that is stationary on the platen 5 is irradiated onto the photoreceptor 14 in the form of a slit by the S optical system *13.

After the photoreceptor 14 is irradiated with the image light of the entire image surface of the original 2 by the exposure device 13, the stopper 11 moves away from the transport path of the original 2 and a driving force is applied to the transport belt 9, so that the original 2 is ejected toward the original ejection tray 12 by the conveyor belt 9, and is stored in the original ejection tray 12 by colliding with the stop plate 12a and being stopped.

A document presence/absence sensor 15 for detecting the presence or absence of a document 2 is arranged above the document set tray 1 . The document presence/absence sensor 15 is composed of, for example, a light emitting element and a light receiving collector.

Document size sensors 16 and 17 are fixed below the document set tray 1. Below these document size sensors 16 and 17, there is a detection plate 18 as shown in FIG.
．． 19 are arranged.

These document size sensors 16.17 use proximity switches, and generate an output signal when the detection plate 18.19 is nearby, and output a signal when the detection plate 18.19 is not nearby. does not occur. The document size sensors 16 and 17 move together with the side guide 3, and as shown in FIGS. If the originals 2 are placed in the position indicated by B5, then the originals 2 are placed in the Japanese Industrial Standards A row No. 3, B row No. 4, A row No. 4, and B row No. 5, respectively.
This is the case when it is placed on the The above original size sensor 16
, 17 emit output signals in proximity to the sensing plates 18, 19 only when in positions A3 and B4. The document size sensors 16 and 17 are close to the detection plates 18 and 19 and generate output signals only when they are in the B4 and A4 positions.

The exposure device 13 includes an illumination lamp 2o, a lamp 7
1, a first movable mirror 22, a second movable mirror 23, an in-mirror lens 24, a stationary mirror 25, and a slit forming plate 2-6.

The first movable mirror 22 is arranged to receive image light from the document 2 illuminated by the illumination lamp 20,
A second movable mirror 23 is arranged to receive the image light from the first movable mirror 22. The in-mirror lens 2 is configured to receive the image light from the second movable mirror 23.
4 is arranged, and a fourth stationary mirror 25 is arranged so as to receive the image light from this in-mirror lens 24. The photoreceptor 14 is arranged to receive the image light from the fourth stationary mirror 25. A slit forming plate 26 is arranged near the photoreceptor 140.

The first movable mirror 22 and the second movable mirror 23 are
The illumination lamps 20 and 7 are moved synchronously in the directions of arrows a and b at a speed ratio of 2:1 by a driving means (not shown).
The rector 21 is moved in the direction of the arrow a in synchronization with the first movable mirror 22 at the same speed as the first movable mirror 22, so that the slit-shaped image light from the original 2 is directed onto the photoreceptor 14, which is rotated in the direction of the arrow C. irradiated. The first movable mirror 22, the second movable mirror 23, the illumination lamp 20 and the mirror 21
After reaching the return position, it is moved in the direction opposite to the directions of arrows a and b and returns to the home position.

The positions of the in-mirror lens 24 and the fourth stationary mirror 25 can be changed by a magnification ratio changing means 27, and the copying magnification of the exposure device 13 can be changed to a predetermined value. If the copy magnification is changed, the first
The ratio between the moving speed of the movable mirror 22 and the circumferential speed of the photoreceptor 14 is changed to a predetermined value. The magnification ratio changing means 27 is configured by, for example, transmitting the rotational force of a servo motor to the in-mirror lens 24 and the fourth stationary mirror 25 by means of power transmission means. The operation of the magnification ratio changing means 27 is controlled by a magnification ratio designation circuit 28 operated by a plurality of magnification ratio designation switches displaying magnification ratios such as 1, 0.82, 0.7.1, etc. Controlled based on output signal. The exposure device [13] is not limited to the illustrated embodiment.

Around the photoreceptor 14, a charging device 29, a developing device 3
0. A transfer paper feeding device 31, a transfer device 32, a transfer paper separating claw 33, a fixing device 34, a cleaning device 35, a static eliminator 5136, and the like are arranged at predetermined positions.

The above-mentioned transfer paper feeding amount 31 is Japanese Industrial Standards B row No. 5, A
Transfer paper 37 of the size of row No. 4, row B no. 4, and row A no. 3
38, 39, 40.
41, and paper feed rollers 42a and 43a from which the transfer paper 37 is fed separately.

44a, 45a, a plurality of guide plates 46, and the transfer device 3
The paper feed rollers 42a, 4 are arranged near the paper feed rollers 42a, 4
Transfer paper 3 sent out by 3a, 44a, 45a
7 is temporarily stopped and feeds the transfer paper 37 between the transfer device 32 and the photoreceptor 14 in synchronization with the toner image on the photoreceptor 14. Above paper feeder 04
2a, 43a, 44a', and 45a are each rotated by separate driving means, and these are connected to the transfer paper feeding means 42.4.
It consists of 3.44 and 45.

The transfer paper 37 fed between the transfer device 32 and the photoconductor 14 is separated from the photoconductor 14 by the transfer paper separation claw 33 after the toner image of the photoconductor 14 is transferred by the transfer device 132. First, the paper passes through a conveyance roller 46 and a guide plate 47 to enter a fixing device 34, where the toner image is fixed, and then is discharged to a transfer paper discharge tray 49 by a discharge roller 48.

As shown in FIG. 5, the transfer paper cassettes 38, 39,
Mark sheets 50, 51, 52. are on the side plates of 40 and 41.
53 are attached, and these mark sheets 50
, 51, 52, and 53, there are arranged three transfer paper cassette size sensors 54, 55, 56, and 57 each consisting of a pair of light emitting elements and a light receiving element. For example, the mark sheet 50.5 receives light from the transfer paper cassette size sensor 54, 55, 56° 570 light emitting element.
1, 52, and 53 are expressed as "l" when there is an input and as "0" when there is no input, then 111, 110, and 101 are applied to the light receiving elements of the transfer paper cassette size sensors 54, 55, and 56, and 57, respectively. The transfer paper cassettes 38, 39, 40,
When transfer paper cassette size sensor 41 is not located at the paper feeding position, the light receiving elements of transfer paper cassette size sensors 54, 55, 56, and 57 receive information of 000. Above the transfer paper cassette) 38, 39, 40, 41, there is a transfer paper 37
Transfer paper presence sensor 58, 59.60 detecting the presence or absence of
, 61 are arranged, and these transfer paper presence/absence sensors 58, 59, 60, and 61 are composed of, for example, a light emitting element and a light receiving element.

As shown in FIG. 6, the output signals of the document presence sensor 15, document size sensor 16, 17, transfer paper cassette size sensor 54, 55, 56, 57, and transfer paper presence sensor 58, 59, 60, 61 are input. Control circuit 62
given to. Further, the output signal of the magnification ratio specifying circuit 28 is also given to the input control circuit 62, and the output signal of the operation circuit 63 for giving a start signal etc. is also given to the input control circuit 62.
given to 2.

The human control circuit 62 is connected to a central control circuit 64, and this central control circuit 64 has a ROM 65 and a RAM 66.
and is connected to the output control circuit 67. The central control circuit 64 performs control according to a predetermined program stored in the ROM 65.

The RAM 66 above is mainly the document size sensor 16°17
, transfer paper cassette size sensor 54, 55.56.5
7 and the output signal from the magnification ratio designation circuit 28 are stored. On the output side of the output control circuit 67, in addition to the magnification ratio changing means 27, the transfer paper feeding means 42, 43, 44, and 45 and the display device 68, there is also a device k that needs to control the operation of the electronic copying machine. It is connected.

The central control circuit 64 controls the operations of all devices in the electronic copying machine, and among these controls, the controls necessary for carrying out the present invention will be described below.

When the central control circuit 64 receives a start signal from the operation circuit 63, it outputs output signals from the original size sensor 16, 17, the operated magnification ratio designation circuit 28, and the transfer paper cassette size sensor 54, 55, 56°57. R, AM6
Based on the information from the document size sensors 16, 17 and the variable magnification ratio specifying circuit 28 stored in the RAM 66, which size transfer paper cassettes 38, 39,
Select whether to feed the transfer paper 37 of 40°41, and press R.
Based on the information from the transfer paper cassette size sensors 54, 55, 56, and 57 stored in the AM66, it is determined whether the selected one of the transfer paper cassettes 38, 39, 40, and 41 is placed at the paper feeding position. Transfer paper cassette selected by determination) 38, 39.

If 40.41 is placed in the paper feed position, the selected transfer paper cassette) 38.39, 40° Transfer paper 3 at 41
transfer paper feeding means 42, 43, 44,
45 and operate at ℃.

The central control circuit 64 prohibits the start of the copying operation when there is no output signal from the document presence sensor 15, the transfer paper cassette size sensor 54, 55, 56, 57, or the transfer paper presence sensor 58, 59, 60, 61. In addition, the display device 68 displays the fact that copying is not possible, and the transfer paper cassettes 38, 39, 40, 4 indicate that there is no original.
1 is not placed at the paper feeding position or that there is no transfer paper. If a new variable magnification ratio is set in the variable magnification ratio designation circuit 28 after the start of the copying operation is prohibited, the start of the copying operation is set on the assumption that there is no condition for prohibiting the start of the copying operation. The ban is lifted.

Further, when the central control circuit 64 receives the output signal from the zoom ratio specifying circuit 28, it is necessary to change the zoom ratio based on this output signal and the previous zoom ratio information stored in the RAM 66. Only when it is necessary to change the magnification ratio, an output signal is given to the magnification ratio changing means 27 to operate it and change the magnification ratio of the exposure bag [13] to a predetermined value.

Note that the document size sensor that detects the size of the document 2 may be composed of a plurality of light emitting elements and light receiving elements. In addition, the transfer paper cassettes 38, 39, 4
The transfer paper cassette size sensor that detects the size of 0.41 has magnetic tapes attached to the side plates of the transfer paper cassettes 38, 39, 40, and 41, and a magnetically sensitive semiconductor located at a position facing these magnetic tapes. A plurality of sensors using elements may be arranged and these sensors may be configured to detect the magnetized portion of the magnetic tape.

A desired number of variable magnification ratios can be specified by the variable magnification ratio designation circuit 28, and in this case, a plurality of different sizes can be selected from the variable magnification ratio B and the size of the document. It is necessary to arrange a plurality of transfer paper cassettes containing transfer paper, and to arrange a number of transfer paper feeding means corresponding to these transfer paper cassettes.

The electronic copying machine of the present invention simply specifies the magnification ratio by operating a plurality of magnification ratio designation switches in the magnification ratio designation circuit, and the electronic copying machine specifies the magnification ratio based on the output signal of the document size sensor and the magnification ratio designation circuit. Since the transfer paper feeding means of the transfer paper cassette containing the transfer paper of the required size is selected and activated, there is no need for an operator to select the transfer paper.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view schematically showing the electronic copying machine of the present invention, FIG. 2 is a partially cutaway front view showing a document size sensor of the above electronic copying machine, and FIGS. 3 and 4 are the same as the above original. FIG. 5 is a partially cutaway side view showing the size sensor, FIG. 5 is a perspective view showing the transfer paper cassette and the transfer paper cassette size sensor of the electronic copying machine of the present invention, and FIG. 6 shows a device for controlling the same electronic copying machine. FIG. DESCRIPTION OF SYMBOLS 1... Original set tray, 2... Original, 3... Side guide, 13... Exposure device, 14... Photoreceptor,
15... Original presence/absence sensor, 16. 17... Original size sensor, 18° 19... Detection plate, 27... Magnification ratio changing means, 28... Magnification ratio designation circuit, 31...・
Transfer paper feeding device, 37... Transfer paper, 38, 39, 40
゜41...Transfer paper cassette, 42, 43, 44゜45
...Transfer paper feeding means, 54, 55, 56°57...
Transfer paper cassette size sensor, 58.59, 60.6
1... Transfer paper presence/absence sensor, 64... Central control circuit, 65... ROM, 66... RAM

Claims (1)

[Claims] A document feeding device capable of feeding a document, an exposure device having a variable magnification ratio changing means capable of changing the magnification of copying, and a plurality of transfer paper cassettes of different sizes. An electronic device comprising at least a transfer paper feeding device that accommodates transfer paper of a size corresponding to the transfer paper cassette and can feed the transfer paper of these transfer paper cassettes by separate transfer paper feeding means. In a copying machine, a document size sensor detects the size of the document placed on the document set tray of the document feeder, and multiple magnification ratio designation switches are used to specify the copying magnification of the exposure device. a magnification ratio designation circuit, a means for causing the magnification ratio changing means to determine the magnification ratio based on the output signal of the magnification ratio designation circuit 2, and an output signal and the magnification ratio of the document size t sensor. An electronic copying machine comprising means for selecting and operating one of a plurality of transfer paper feeding means based on an output signal of a designated circuit.