JPH0133411B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an apparatus for recording an image on a recording material according to a document. 2. Description of the Related Art Conventionally, there has been known a recording apparatus such as a copying machine that includes a plurality of cassettes containing recording materials of different sizes (hereinafter referred to as transfer paper). In such an apparatus, the operator must select a cassette containing a desired size of transfer paper according to the document size before starting copying, which is troublesome for the operator. From this point of view, a method has been proposed in which a sensor is provided in the document holding member to detect the size of the document set on the document table and select the recording material according to the detected size (Japanese Patent Application Laid-Open No. Publication No. 50-11242). However, this requires manual setting of the original on the original table, and the original size detection operation is performed after turning on the copy switch, which increases the copying time by the time required for size detection. There were flaws.
Furthermore, since a paper sensor is required depending on the type of document, the configuration becomes complicated and the cost increases. The present invention has been made in view of the above points, and its purpose is to reduce the annoyance of the operator due to copy mistakes, etc., and to perform recording operations fully automatically and quickly. To provide a low-cost recording device with a simple configuration. That is, the present invention provides feeding means 211, 217, 221, and 223 for feeding a document to an exposure position, and detecting the passing time of the document fed by the feeding means before the exposure position. a first detection means 123 for detecting the size; a plurality of storage means 4 ₁ , 4 ₂ for storing recording materials; a second detection means 126 for detecting the size of the recording materials stored in the plurality of storage means; selection means 140, 1 for comparing the detection outputs of the detection means 123 and the second detection means 126 and selecting a storage means storing a recording material of a size corresponding to the document size from among the plurality of storage means;
42, 153-158, recording means 17, 18, 26-29 for recording an image corresponding to the document fed to the exposure position on the recording material fed from the storage means selected by the selection means; 32, 34,
prohibiting means 152, 137 for comparing the detection outputs of the first detecting means 123 and the second detecting means 26 and prohibiting the output of a recording start signal if there is no storage means storing a recording material of a size corresponding to the document size;
The present invention provides a recording device characterized by having the following. This eliminates the need for a recording material selection operation, which can reduce the troublesomeness of the operator. Further, since the document size is detected according to the passage time of the document while the document is being fed, the number of detection means is small, the configuration is simple, and the cost is low. Furthermore, since this document size detection is performed before the exposure position, it becomes possible to perform the recording operation immediately after the document reaches the exposure position. First, an example of a copying machine to which the present invention is applied will be explained. This copying machine is a powder development transfer type copying machine.
The configuration is such that all kinds of originals can be easily copied, such as sheet-like documents, thick originals such as books, etc. In FIG. 1, 1 is a machine box, 2 is a document table on which a document is placed, and a document auto feeder 3 covers the document table. 4 ₁ , 4 ₂ are transfer sheets of different sizes 5 ₁ ,
5 is a cassette that stores ₂ , and 6 is a tray on which transfer paper that has been transferred and is discharged from the machine is placed. 7 is the main switch, 8 is the warning display section, 10
1 is a paper size display section, 11 is a copy density adjustment dial, 12 is a continuous copy number selection key, 13 is a continuous copy button that is linked to it, and 14 is a non-linked 1
The copy button 15 indicates a stop button for canceling continuous copying. A hopper is placed in the front right where the door is opened to store replenishment agent and send it out as needed. The operation of this copying machine will be explained with reference to FIG. The document glass 16 is moved by the document auto feeder 3.
Place the original to be copied on top of the glass with the tip 1
6 Place it according to ₁ . Next, when the copy button 13 or 14 is pressed, the photosensitive drum 17 starts rotating clockwise in the figure. When the photosensitive drum 17 reaches a predetermined position and a signal to start exposure is issued, the illumination lamp 18 and first mirror 19, which are the movable parts of the optical system,
starts moving in the right direction in the drawing at the same speed as the circumferential speed of the photosensitive drum 17, and the second mirror 20 starts moving in the direction in the drawing at half that speed. The image of the document illuminated from below by the illumination lamp 18 is
Mirror 19, second mirror 20, lens 21, third
An image is formed on the photosensitive drum 17 at the exposure section 24 by an optical system consisting of a mirror 22 and a fourth mirror 23 .
When the exposure is completed, the moving part of the optical system detects its position, stops moving to the right, and immediately moves in the opposite direction, i.e.
Return to the left. This return speed is made faster than the reciprocating speed to increase copying efficiency. Then, when it returns to the initial position, the drive to the moving part of the optical system is cut off.
Stop. When copying a large number of copies continuously from the same document, it is sufficient to specify an arbitrary number of copies using the continuous copy number selection key 12 and start the copying using the continuous copy button 13. Furthermore, by starting with the single copy button 14, only one copy can be made regardless of the number of copies specified by the copy number selection key 12. The photosensitive drum 17 has a three-layer structure in which a photosensitive layer on a conductive substrate is covered with a transparent insulating layer.
Rotate clockwise as shown. The drum 17 is first charged by a positive charger 26 that is supplied with a high voltage current from a high voltage power source. Subsequently, when it reaches the exposure section 24, the image of the document described above is subjected to slit exposure and at the same time is AC charged (discharged) by an AC charger 27 supplied with AC high voltage current from a high voltage power source. Then, an electrostatic latent image is formed on the surface of the photosensitive drum 17 by the next full-face exposure using the full-face exposure lamp 28 and enters the developing device 29 . In the developing device 29, the carrier on the sleeve 31 rotating around the magnet 30 comes into contact with a magnetic brush made of toner, so that the electrostatic latent image on the photosensitive drum 17 is developed and visualized. Next, the transfer paper 5 sent from the paper feed section is brought into close contact with the photosensitive drum 17, and the transfer charger 32 charges the photosensitive drum 17 with a high voltage current from a high voltage power supply, so that the developed image on the photosensitive drum 17 is transferred onto the transfer paper 5. transcribed. After the transfer, the transfer paper 5 is separated from the photosensitive drum 17 by being restrained at one end by a separation belt and guided to the fixing device 34. The edge portion 35 ₁ of the cleaning blade 35 is pressed against the photosensitive drum.
The remaining toner is wiped away and the next cycle is repeated. The toner wiped by the cleaning blade 35 rises onto the cleaning blade 35 and is removed by the screw 36 from the photosensitive drum 17 on the front side in the figure.
Developing device 2 is installed outside the area of
9 and used again for development. Transfer paper 5 ₁
is stored in the cassette ₄₁ , and the transfer paper ₅₂ is stored in the cassette _{42 .}
It is removably attached to 38 ₂ . Various cassettes are available for different sizes of transfer paper, and can be easily replaced as needed. The selection of paper feed from the paper feed section 38 ₁ or 38 ₂ is performed by an automatic cassette selection device, which will be described later. When the photosensitive drum 17 reaches a predetermined position and issues a paper feed signal, the constantly rotating paper feed roller 39 ₁ or 39 ₂ is pressed onto the transfer paper 5 ₁ or 5 ₂ by an electromagnetic drive device (not shown). Transfer paper 5 ₁ or 5 ₂
is sent out to the right in the figure. Next, the first register rollers 40 ₁ , 41 ₁ or 40 ₂ , 41 ₂ prevent skewing and send the paper in the correct direction. Subsequently, the second register rollers 42 and 43 synchronize with the image on the photosensitive drum 17 using signals from the movable part of the optical system, and then the transfer paper 5 is brought into close contact with the photosensitive drum 17 as described above, and the image is transferred thereto. . After the transfer is completed, the transfer paper is removed from the photosensitive drum 17 by the separation belt.
Next, it enters the fixing device 34. In the fixing device 34, a transfer paper 5 having an unfixed image on its surface is passed between a hard elastic fixing roller 46 heated by a heating roller 45 having a heater 44 inside and a facing roller 48 also having a heater 47 inside. As the toner passes through and is heated, the toner is thermally fused and the image is fixed on the transfer paper 5. After the transfer paper 5 leaves the fixing device 34, the charge remaining on the surface is finally removed by the static eliminator 49, and then the transfer paper 5 is transferred to the discharge rollers 50, 51.
It is then discharged onto the guide plate 103 of the device. The photosensitive drum 17 of this copying machine is capable of copying up to the width of an A3 sheet, and its outer circumference is somewhat longer than the length of an A3 sheet. , the backward movement requires almost the same amount of time as the forward movement. Therefore, in the case of A3 copying, one sheet is printed for every two revolutions of the photosensitive drum, and in the case of A4 copying,
The transfer paper is fed horizontally (in a direction perpendicular to the longitudinal direction) so that one copy can be made per rotation of the photosensitive drum. The above-mentioned difference in cycle due to paper size is determined by a signal from the cassette 4 ₁ or 4 ₂ selected by an automatic cassette selection device to be described later, and the amount of movement of the movable part of the optical system is controlled. After the copying operation is completed, the trailing edge of the transfer paper 5 is
After passing through the discharge rollers 50 and 51, the photosensitive drum 17 stops. At this time, in order to prevent the cleaning blade 35 from constantly being in pressure contact with the surface of the photosensitive drum 17, which may affect the image, the edge portion ₃₅₁ of the cleaning blade 35 should be placed near the seam of the photosensitive layer, that is, the area where the image does not appear. The photosensitive drum 17 stops at this position. In addition, 52 and 53 are transfer paper 5, cassette 4,
This is a storage space for developer and other consumables. Referring to FIG. 3, the document auto feeder 3 will be described in further detail. A document switch 203 consisting of a detection element such as a micro switch is provided in a part of the document table 2 of the ADF, and detects whether or not there is a document 202 on the document table 2. The manuscript must be full size (e.g. A3, B4 size),
Or half size (e.g. A4, B5 size)
However, when placing the original on the original platen 2, the original must be fed horizontally (the width direction of the original matches the direction of transport of the original) for full-size originals. As can be seen, a half-size original is placed so that the original is fed vertically (the longitudinal direction of the original coincides with the direction in which the original is transported). The document 202 placed on the document table 2 is moved by the rotor 2.
04, is held between rollers 205, and fed onto the belt 211. The timing of feeding the document is determined by moving the timing roller 206 downward from the state shown in the figure.
The document sent out onto 11 passes through a light emitting element 20.
8 and a light receiving element 209. This switch is arranged at a position through which both full-size and half-size originals must pass, and is shown as an original detection switch 123 in FIG. A switch having a similar structure is arranged in parallel with the switch 123 (shifted in a direction perpendicular to the plane of FIG. However, it is arranged at a position where half-size originals do not pass through, and is shown as an original size detection switch 124 in FIG. Of course, if half-size originals are fed horizontally and full-sized originals are fed vertically, the size of the original can be detected by the time it takes for the original to pass, and the presence of the original can also be detected. It's good. Presser rollers 210 and 212 are placed on the belt 211.
Therefore, the document on the belt 211 is transferred to the right in FIG.
17 and 218, and a guide 219, the document is sent onto a glass table 220 that constitutes the document table of the copying machine. A belt 221 is further wound between the rollers 217 and 223, and the roller 223 moves up and down as shown by arrow F, so by moving the roller 223 downward, the glass is sent onto the glass table 220. It is possible to further transport the original document to the left in the figure. Since a stopper 225 is provided at the left end of the glass table 220, the original hits the stopper 225, and at the same time, a motor (not shown) is stopped by the original selection detection output of the original selection detector 224, and the original transport belt is stopped. and stop driving the rollers. After the predetermined copying of the original is completed, the stopper 225 is retracted from the original transport path, and the roller 22
3 moves downward and rotates, moving the original to the left in the figure, and ejecting the document onto the ejection tray 328 by the ejection roller 226. Next, the folding device will be further explained with reference to FIG. 2 and FIGS. 4 to 6. The transfer paper 5 discharged by the rollers 50 and 51 is guided by a guide plate 103, sent upward by a feed roller 102 and a conveyor belt 104, and guided to a folding part by a presser roller part 105. This folding portion is formed by a pair of rollers 107, 108 and a plunger 1, as shown in FIGS.
19, a roller 106 controlled as shown in FIG. 5 or FIG.
18, etc. To explain the operation of the folding section, when the transfer paper 5 transported upward by the conveyor belt 104 and the presser roller 105 is half size, the "fold signal" shown in FIG. 8 is derived. Not done. Therefore, the guide plate 118 is held at the position shown in FIG. 6 by a spring (not shown), and the roller 106 is moved to the position shown in dotted line in FIG. As shown in FIG. 6, the arm 113 and the stopper 116 are in contact with each other (the position shown in FIG. 6). Therefore, as shown in FIG. 6, the transfer paper 5 coming up from below is guided by the guide plate 118 between the rollers 107 and 108, and is discharged onto the tray 6 as it is. On the other hand, when the transfer paper 5 is full size, a "folding signal" is derived from the circuit shown in FIG. When this folding signal is derived, an electromagnetic drive device (not shown) moves the guide plate 118 to the position shown in FIG.
arm 113 and stopper 117
is held in the position where it stops. Therefore, the transfer paper 5 that has come up from below is held between the rollers 106 and 107 and enters the storage section 109. As shown in FIG. 5, the end portion 11 of the storage portion 109
After the leading edge of the transfer paper 5 hits the roller 10
When the transfer paper 5 is further transported upward by the rollers 6 and 107, a portion 53 of the transfer paper 5 is bent, caught between the rollers 107 and 108, bent, and discharged onto the tray 6. . FIG. 7 shows a timing chart when the apparatus of the present invention makes two copies of each document sent from the ADF to the document table. First, at timing 1, the operator presses the "copy button" B, but since no original is set in the ADF, no operation is performed. Timing 2 indicates that the operator noticed this and set the document. Timing 4 indicates that the operator has pressed the "copy button" again. As a result, since the copy conditions are met, the "ADF document feed motor" is driven, and one document is taken out and sent onto the document table. At timing 5, a full-size original is sent, the original detection switch 1 and the original size detection switch 2 are driven, and the original size storage element is set.
Timing 6 indicates that the document has passed through the switch. Timing 7 indicates that the original end of the document sent to the document table has reached the proper position and the "document home position" switch is activated. Therefore, as a result, the "ADF document feed motor" is stopped and the document is stopped on the glass table. Furthermore, based on the result of this stop, the "copy signal" is turned on to drive the main body of the copying apparatus. Simultaneously with this drive, the "folding solenoid 111" is excited in response to the operation of the document size storage element at timing 5. At timing 8, the post-rotation cycle is entered and a "coincidence signal" indicating that the number of copies set by the operator matches the number of copies is generated. Timing 9 indicates that the photosensitive drum in the copying device has reached the home position when the "coincidence signal" is generated, and when these two conditions are met, the copying device is stopped, so " copy signal”
Turn it off. Furthermore, due to this stop, “ADF
The document feed motor is driven to eject the document on the document table and send a new document to the document table.Furthermore, the document size memory element set at timing 5 is cleared, and the size of the subsequent document is stored. Prepared for memory.Timing 1
At 0, it detects that a full-size document has arrived again and remembers that it is full-size. Timing 11 indicates that the original that has been on the original table has been completely discharged from the original table. Furthermore, a "timer" is set by this ejection signal, and this is activated in order to turn off the "ADF document feed motor" at the fall of this timer signal when there is no subsequent document after the timer time elapses. ing. Timing 12 indicates that the original has passed through the original size detection switches 1 and 2. At timing 13, the second document reaches the appropriate position on the document table within the time that this "timer" does not turn off, and the "document home position" is reached.
Indicates that the switch was activated. Furthermore, as in the case of timing 7, this turns off the "ADF document feed motor" and turns on the "copy signal" that drives the main body of the copying machine. Also, the document size memory element is set again, Since it remembers that it is full size, the "folding solenoid 111" continues to be excited.Then, the copy cycle is repeated in the same way.At timing 14, the same operation as at timing 4 is performed.At timing 15, Since only the original detection switch 1 is set, it indicates that a half-size original is being sent, and therefore the original size storage element is not set and the half-size original is memorized. This indicates that the original has passed the switch. At timing 17, the second original is ejected from the original table, and
The third and final document is fed from the ADF's document tray, and the "remaining document amount detection" switch is turned off, indicating that there are no more documents in the document tray. At timing 18, the movement is similar to timings 7 and 13, but at timing 15
Then, in response to remembering that it is half size, the "destruction solenoid 111" is turned OFF. At timing 19, after the third and final document is ejected, the document does not appear even after the timer time elapses, so the "ADF document feed motor" is activated.
Turned off to indicate that all operations have stopped. Now, consider the relationship between the operation of the original size storage element and the time the copy paper takes to reach the folding section. In the circuit according to the present invention, at the rising edge of the copy signal,
That is, the copying machine is designed to respond only when it starts copying, and as is clear from the timing chart, the time b' when the last copy sheet for each document reaches the folding section is
Since this is the time when the ADF is sending the next document to the document table, the "folding solenoid 111" is
It is unlikely that an inconvenience such as switching occurs. Next, FIG. 8 shows a circuit that embodies the timing shown in FIG. 7 based on the above explanation. The control circuit shown in FIG. 8 includes a copy button switch 120 (its output waveform is the seventh
(Figure A), the remaining amount switch 203 (its output waveform is shown in Figure 7B) that detects whether or not there is a document remaining, and the document switch 224 (its output) that detects whether or not the document is at the home position. The waveform is the 7th
(D), the document detection switch 123 that detects the presence of a document (its output waveform is shown in FIG. 7), the document size detection switch 124 that detects the size of the document (its output waveform is shown in FIG. 7), and the photosensitive drum By installing the drum detection switch 125 (its output waveform is shown in Fig. 7), which detects whether or not the drum is in the position, and the cassette containing the transfer paper into the copying machine, the transfer paper stored in the cassette can be detected. An input signal is obtained by a cassette switch 126 which is driven according to the size. As mentioned above, each switch outputs a high level signal to the contact when the contact is in contact with the "present" or "ON" side contact in the diagram, and outputs a low level signal in other states. This is what we have derived. (However, the cassette switch 126 is the opposite.) Each of the above-mentioned switches is a switch that has already been explained or is a well-known switch, so a detailed explanation thereof will be omitted here. The control circuit shown in FIG. 8 uses the switches described above as input signals, and receives an "ADF signal" (waveform C in FIG. 7) that commands the drive of the ADF document feed motor, and a "copy signal" that commands the execution of a copy cycle. ” (its waveform is shown in Figure 7), a “solenoid signal” which commands the drive of the folding solenoid mentioned above, and a “folding signal” (the waveform of which is shown in FIG. The waveforms are shown in Fig. 7 (N), the "upper paper feed signal" or the "lower paper feed signal" which commands the drive of the feed roller 391 or 392 to feed the transfer paper stored in the upper cassette or the transfer paper stored in the lower cassette. This is used to derive the paper feed signal. The ADF signal mentioned above is the RS flip-flop 127
The ADF signal is generated by the set output of the ADF signal, but there are two possible cases regarding the timing at which this ADF signal is derived. This is the case represented by timings 4 and 9 in FIG. The case represented by timing 4 is the AND gate 128 in FIG. This is the case where a low level signal is input to the input of the AND gate 128 (which is the logic for setting), and the case represented by timing 9 is the case where a low level signal is input to the input 2 of the AND gate 128. In the case represented by timing 4 above, the logic is assembled in the NAND gate 129, so when the copy button switch is turned on with the document remaining amount switch 121 in the "present" state and the document switch 122 in the "absent" state, the NAND gate Inputs 1, 2, and 3 of 129 all go high, and the output goes low, setting flip-flop 127. In the case represented by timing 9 above, the output Q of the RS flip-flop 130 that derives the "copy signal" drives the differentiating circuit 131, and inputs a low level corresponding to the falling edge of the flip-flop 130 to the input 2 of the AND gate 128. The flip-flop 127 is set by inputting the differential pulse. The flip-flop 127 is reset.
There are two possible cases in which the derivation of the ADF signal stops. This is the case represented by timings 7 and 19 in FIG. The case represented by timing 7 is a case where a low level signal is applied to input 1 of the AND gate 132 in FIG.
The case represented by 9 is a case where a low level signal is applied to the input 2 of the AND gate 132. AND gate 132 has a logic structure that outputs a low level signal when a low level signal is input to either input 1 or 2, and resets flip-flop 127. In the case represented by timing 7 above, at the moment when the original switch 122 is switched to "present", that is, when the output of the inverter 133 changes from a high level to a low level, the differentiating circuit 134 is driven by the inverter output. Then, the low level pulse signal generated by the differentiating circuit 134 is applied to input 1 of the AND gate 132 to reset the flip-flop 127. In the case represented by timing 19 above, when the original switch 122 changes from "present" to "absent", a timer 135 is set, and a high level signal is derived from the timer 135 for a predetermined time. . When the timer 135 passes a predetermined time and its output changes from a high level to a low level, the differentiating circuit 136 is driven to apply a low level pulse signal to the input 2 of the AND gate 132 to drive the flip-flop 127. This is for resetting. The above-mentioned "copy signal" is constituted by the set output signal of the RS flip-flop 130, and the case where the flip-flop 130 is set is typified by timing 7 in FIG. The output of the NAND gate 137 is applied to the set terminal of the flip-flop 130, and the output of the original switch 122 is applied to the input 1 of the NAND gate 137. The output of the original switch 122 is applied in this way only when the original switch 122 is on.
This is to allow the flip-flop 130 to set, and to prevent the flip-flop 130 from setting at timing 19 in FIG. 7, for example. At the input 2 of the NAND gate 137, a differentiation circuit 138 differentiates the fall of the output Q of the flip-flop 127, and generates a low-level differential pulse at the moment the output Q changes from a high level to a low level; This differential pulse is inverted by an inverter 139 and then applied. The output of the matching circuit 140 is applied to the input 3 of the NAND gate 137;
The output of an RS flip-flop 141, which is a document size storage element, is applied to input 1 of 40, and the output size signal of the cassette selected by selector 142 is applied to input 2. Therefore, the size of the transfer paper stored in the cassette selected by the original size signal applied to input 1 and the selector 142 (the size referred to here means full size or half size)
Only when they match, a high level signal is derived from the output of the matching circuit 140, and this high level signal is applied to the input 3 of the NAND gate 137. Therefore, the flip-flop 130 has the original switch 122, the original size signal and the transfer paper size match, and the flip-flop 127
It is set when changes from set to reset. The case at timing 9 in FIG. 7 is representative of the case where the flip-flop 130 is reset and the derivation of the copy signal is stopped. That is, the flip-flop 130 is reset by the output of the NAND gate 143, but the output of the drum detection switch 125 is applied to the input 1, and the contents of the counters 144 and 145 are compared to the input 2, and the contents of the counters 144 and 145 are compared. The output of a matching circuit 146 which derives a high level signal when the contents of the two matches is applied. Note that the counter 144 is a counter that stores the number of sheets set by the sheet number setting key 12, and the counter 145 is a counter that counts the number of copies made from the same original. The folding signal is composed of the Q output of the JK flip-flop 147, and this flip-flop 1
The Q output of the flip-flop 141 is applied to the J terminal of the flip-flop 47, and the Q output of the flip-flop 130 is applied to the CP terminal. The flip-flop 141 applies the output of the NAND gate 148 to the set terminal, and the output of the document detection switch 123 is applied to the input 1 of the NAND gate 148, and the output of the document size detection switch 124 is applied to the input 2, so that As mentioned above, switch 12
It is set only when both 3 and 124 outputs are present. In other words, when the flip-flop 141 is deriving the Q output, it indicates that the document size is full size (needs to be folded and ejected), and when the flip-flop 141 is not deriving the Q output (the document detection switch 123 is in the ON state and the switch 124 is in the OFF state), the Q output is not derived and the document size is half size (there is no need to fold and eject the document). As is clear from the above description, the fold signal is derived when the flip-flop 141 derives the full-size signal and the flip-flop 130 derives the copy signal. The output of the differential circuit 131 is applied to the reset input of the flip-flop 141, and the Q output of the flip-flop 141 is applied to the reset input of the flip-flop 141 through an inverter 149.
7, the flip-flop 147 is applied to the K terminal of FIG.
When the copy signal changes from a low level to a high level in a state where it is detected that the document size is half size as shown at 8, the derivation of the Q output (derivation of the solenoid signal) is stopped. The size signal is applied to the matching circuit 140 through the signal line 150, and the derivation of the upper and lower paper feed signals will be explained in more detail below. As mentioned above, the cassette switch 126 is the three switches MS1 to MS3 that are activated when the cassette 41 is inserted into the upper tier, and the three switches MS1 to MS3 that are activated when the cassette 42 is inserted into the lower tier. Three switches MS4 to be driven
Each switch is controlled according to the size of the transfer paper stored in the inserted cassette (cassette size) as shown in the table below.

[Table] When the output of the switch MS controlled as described above is applied to the selector 142, and a low level signal is derived from the signal line 151 and is applied to the terminal a, the outputs of MS1 to MS3 are applied to the selector 142. When a high level signal is derived from the signal line 151 and is applied to terminal a, the outputs from MS4 to MS6 are output to outputs 1 to 3 of the selector 142. The selector 142 is configured. Therefore, if we pay attention to the output 3 of the selector 142, as is clear from Table 1, if a high level signal is derived from this output 3 due to the OFF of the switch MS, then the full size cassette has been selected. , switch MS ON
If a low level signal is derived by , then the half-size cassette has been selected. Therefore, if the Q output of the flip-flop 141 is applied to the input 1 of the matching circuit 140, and the signal of the output 3 of the selector 142 is applied to the input 2, the matching circuit 140 will tell you that the original size and the cassette size match. When the document size and cassette size do not match (for example, both full size and half size), a high level signal is derived. Therefore, if the original size and the cassette size do not match, a low level signal is applied to the NAND gate 137 via the signal line 152, so that no set signal is input to the flip-flop 130 and no copy signal is derived. Also, after this low level signal is made into a high level signal by the inverter 153,
applied to input 1 of AND gate 154. Since the oscillation output of the oscillator 155 (the oscillation output changes between a high level and a low level) is applied to the AND gate 154 input 2, the application of the first high level pulse in the oscillation output causes the AND gate 155 to
4 higher level pulse is JK flip-flop 1
It is applied to the CP terminal of 56. By applying such a pulse, the flip-flop 1
56 is inverted, the signal level on the signal line 151 also changes, causing the selector 142 to change the cassette selected from the upper stage to the lower stage, or from the lower stage to the upper stage. As a result of changing the selected cassette in this way, if the original size and the cassette size match, a low level signal is applied to input 1 of the AND gate 154, so that the oscillation output of the oscillator 155 is applied to the CP terminal of the flip-flop 156. This state is maintained without being applied. The Q output of the flip-flop 156 is connected to the AND gate 15.
7, the output is applied to input 2 of AND gate 158, and the output is applied to input 2 of AND gate 158,
Since the transfer paper feed signal (such a signal is well known in ordinary copying machines) is applied to input 1 of 8, the output of AND gate 157 is applied to the paper feed signal in FIG. roller 39
₂ as a solenoid drive signal for driving an electromagnetic drive device (not shown) for pressing the transfer paper 5 ₂ ,
If the output of the AND gate 158 is used as a solenoid drive signal for driving an electromagnetic drive device (not shown) for pressing the paper feed roller 39 ₁ onto the transfer paper 5 ₁ in FIG. It is possible to automatically select a cassette.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a copying machine to which the present invention is applied, FIG. 2 is a side sectional view of the copying machine shown in FIG.
3 is a side sectional view showing the document auto feeder applied to the copying machine shown in FIG. 1; FIGS. 4 and 5;
6 is a side sectional view showing the folding section applied to the copying machine shown in FIG. 1, FIG. 7 is a signal waveform diagram showing the operation timing of the copying machine shown in FIGS. 1 and 2, and FIG. 8 is a control circuit diagram for forming the signal waveform shown in FIG. 7. Here, 3 is a document auto feeder, 4 ₁ and 4 ₂ are cassettes, 5 ₁ and 5 ₂ are transfer paper sheets, 106, 107,
108 is a roller, 111 is a solenoid, 127,
130, 141, 147, 156 are flip-flops, 120, 121, 122, 123, 12
4,125 is a switch, 140 is a matching circuit, 14
2 is a selector.

Claims (1)

[Scope of Claims] 1. Feeding means for feeding an original to an exposure position; a first means for detecting the original size by detecting the passage time of the original fed by the feeding means before the exposure position; a detection means, a plurality of storage means for storing recording materials, a second detection means for detecting the size of the recording materials stored in the plurality of storage means, and a comparison with the detection outputs of the first detection means and the second detection means. a selection means for selecting a storage means storing a recording material of a size corresponding to the document size from among the plurality of storage means; a recording means for recording an image corresponding to the document fed to the document; and a storage means for comparing the detection outputs of the first detecting means and the second detecting means and storing a recording material of a size corresponding to the document size. A recording device comprising: , prohibition means for prohibiting output of a recording start signal.