JPH0733200B2 - Sheet material discharging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a sheet material discharging device for discharging a sheet material to a predetermined position by means of a sheet material discharging device, for example, a document conveying device connected to a copying machine, a sorter, and a copying machine main body. Control of the discharge part, the double-sided inside the copying machine, or the intermediate tray part for multiple copying.

(Prior Art) Some conventional examples of a document feeding device, which is a typical example of this type of device, will be described.

As shown in FIGS. 15 to 19, the originals stacked on the paper feed trays 201, 301, 401 are separated one by one from above or below by the separating units 202, 302, 402, placed on the platens 204, 304, 404 by the transport belts 203, 303, 403, processed, and then discharged. Tray 20
It is configured to be discharged to 5,305 or returned to the paper feed tray 401.

(Problems to be Solved by the Invention) However, in the document feeder configured as described above, the method for ejecting a document is the same regardless of the characteristics of each document. For example, the discharging speed is the same as the normal conveying speed regardless of the stiffness and size of the original. For this reason, when the original is not firm, if you have an elevation angle even a little at the moment when it begins to be ejected, it will trap the air layer and curl up upward, curl up in the output tray image, or the original. When the size of is large, the paper tray may be bumped (type in Fig. 16),
There is a defect that the original is damaged or the original is jammed. Such drawbacks are caused especially when the conveyance speed is high, when the original is curled from the beginning, when the original is weak, in other words when the transparency is high or the paper thickness is thin. The degree of occurrence will increase.
Further, even if the paper thickness is not thin, as the size of the original becomes larger, not only the collision occurs but also the possibility of curling increases.

These drawbacks are not limited to the document feeder, but are for the copy paper ejecting section of the main body of the copying machine (A in Fig. 13), the inside of the copying machine having the functions of double-sided copying and multiplex copying, and the intermediate for multiplex copying. The same applies to the carry-out section (section B in FIG. 13) discharged toward the tray, and the discharge section (FIG. 14) into each bin of the sorter connected to the main body of the copying machine. Documents and copy papers made of materials other than the above) were turned up, curled up, and jammed due to it.

The present invention has been made in view of the above problems, and an object thereof is to provide a sheet material discharging device capable of preventing the occurrence of curling, curling, and jamming due to uneven sheet characteristics. .

(Means for Solving the Problem) In the present invention, in a sheet material discharging device that discharges a sheet material to a predetermined position by a discharging means at a discharging speed slower than a conveying speed, The detecting means for detecting and the discharging means for discharging the sheet material detected by the detecting means so that the sheet material having a thickness smaller than a predetermined thickness is discharged at a slower speed than the sheet material having a thickness larger than the predetermined thickness. And a control unit for controlling the sheet material discharge device.

The detection means may detect the thickness by detecting the transparency of the sheet material.

It is preferable that the control means controls the discharging means such that a thinner sheet material is discharged at a slower speed.

Further, the control means, in the case of a small-sized sheet material,
The control for making the discharging speed at the time of discharging slower than the conveying speed is not performed.

(Working) Since the sheet material is easily turned up or rounded depending on the thickness or size of the sheet material, it is possible to change the sheet material discharging speed according to the characteristics of the sheet material such as the thickness or the size, and thus the sheet material may be turned up or down. You can prevent jams.

(Embodiment) With reference to the drawings, a description will be given below of a document feeder which is an embodiment of the sheet material discharging device of the present invention.

FIG. 1 shows a document feeder 1 embodying the present invention as a copying machine 2.
It is a longitudinal cross-sectional view showing a state of being mounted on the main body. Here, the document feeder 1 will be described by using the type shown in FIG. 16 of the conventional example, but either of the types shown in FIGS. 15 and 17 may be used.

The document feeder 1 is arranged above the copying machine 2 and has a full-face belt 7 wound around a driving roller 5 and a driven roller 6 facing the platen 3 of the copying machine 2. One end of a shaft 8a of a motor 8 is connected to the shaft 5a of the drive roller 5, and a clock disk 9 is fixed to the other end of the shaft 8a.

A photo interrupter 10 is arranged near the clock disk 9. The photo interrupter 10 is configured to count the number of slits in the clock disk 9 to control the movement amount of the entire surface belt 7. A paper discharge tray 12 for receiving processed documents is arranged in the apparatus main body 11 above the entire surface belt 7.

The paper feed tray 13 is attached so as to be rotatable around a hinge 14. By rotating the paper feed tray 13 in the direction of arrow A in the figure, the originals on the paper discharge tray 12 can be easily taken out. A sub-tray 15 is built in the paper feed tray 13 and is attached rotatably around a sub-tray hinge 16. When processing a large-sized original, the paper feed tray is enlarged by rotating it in the direction of arrow B in the drawing. A bending guide pair 18 is provided downstream of the full-face belt 7.
And a paper discharge roller 17 for discharging the document M conveyed by the entire surface belt 7. Bending guide pair 18
A paper discharge sensor 19 for detecting the leading edge and the trailing edge of the document is disposed inside the sheet.

Further, on the left side of the paper feed tray 13, a paper feed roller 20 that feeds the originals M placed on the paper feed tray 13 one by one from the bottom, and rotates the paper M in the counterclockwise direction to convey the original M. A conveyor belt 21, a separation belt 22 that rotates counterclockwise to separate the originals M one by one, a pair of conveyor rollers 23 that conveys the originals M, and a sensor 24 that detects the front and rear ends of the originals M are provided. ing. As a result, a feeding path 25 for feeding the document M onto the platen 3 is formed.

Further, as shown in FIG. 2, a transparency detecting sensor 26 constituting sheet material characteristic detecting means is provided in the vicinity of the conveying roller pair 23.
Is arranged, and the sensor 26 is arranged on the same document width side as the sensor reference 24 on the document reference side. The reason is that the edge (side edge) of the document has less noise than other places.

The sensor 26 is a transmissive sensor, and detects the transparency of the original document passing through the paper feed path, and determines whether the original document is a thin original document in which curling or curling is likely to occur, or vice versa.

Then, when the paper feed tray 13 is closed and a start key (not shown) of the copying machine 2 is pressed, the paper feed roller 20 starts rotating to feed the original document from the lowest position. Discharge M is a conveyor belt
The sheets 21 are separated and conveyed one by one from the lower side to the separation belt 22 and the separation belt 22, and the document M is further sandwiched and conveyed by the conveyance roller pair 23 and inserted between the entire surface belt 7 and the platen 3. Then, the original M is placed on the original placing standard 27 on the platen 3 by the rotation of the entire surface belt 7, and is copied by a copying unit (not shown) of the copying machine 2. After copying, the original M is driven by the drive roller 5.
The sheet is conveyed to the right by the full-face belt 7 which rotates by the drive of the above, and further passes through the bending guide pair 18, is pinched by the pair of sheet discharge rollers 17, and is discharged onto the sheet discharge tray 12.

Now, the document feeder 1 is configured to control the sheet discharge speed according to the transparency of the document (that is, indirectly, the sheet thickness). The operation procedure will be described below.

A-1) When a start key (not shown) of the copying machine 2 is turned on, the conveyor belt 21 and the separation belt 22 at the original conveyance place work to separate the originals one by one from the lower side.

A-2) A document enters the feeding path 25 and is inserted between the entire surface belt 7 and the platen 3 by the pair of conveying rollers 23.

A-3) The original is placed on the platen reference 27 by the rotation of the pair of conveying rollers 23 and the entire surface belt 7.

Therefore, when the document passes through the feeding path 25, the transparency of the document is detected by the transparency detection sensor 26. For example, the transparency is detected by looking at the output voltage of the transparency detection sensor 26. FIG. 3 shows that when the document passes through the feeding path 25, the document is thin paper,
It shows the level of each output voltage in the case of thick paper. If there is no document, level V ₀ , thin paper (for example,
52 g / m ² ), V _H , thick paper (eg 105 g / m ² ), V _H
It becomes _L. That is, this output voltage is the control means S such as CPU.
When the output level is high, the paper is thin, and as the output level is low, the paper is thick. The paper discharge speed is controlled by this information.

A-4) Copying is performed by a copying unit (not shown) of the copying machine 2.

A-5) The entire belt 7 conveys the belt to the right and enters the bending guide pair 18.

A-6) When the leading edge of the document reaches the paper ejection sensor 19, the paper ejection speed control starts. The discharge speed is determined by the output level of the transparency detection sensor 26 detected in the section A-3.
FIG. 4 shows the relationship between the paper discharge speed and the output level of the transparency detection sensor 26. When using thin paper (52 g / m ² ), the output level is V _H and the discharge speed is S _L. When using thick paper (105 g / m ² ), output level V _L and discharge speed S
It is _H and ejects paper at a relatively high speed. That is, when thin paper, it is likely that curling or curling will occur, so paper is ejected at a low speed.On the other hand, for thick paper where curling or curling is not likely to occur, priority is given to the original replacement speed, and paper is ejected at high speed. To prevent a decrease in productivity. FIG. 5 shows the timing of the paper discharge sensor 19 and the paper discharge speed.

A-7) When the original is completely discharged onto the discharge tray 12,
The next document is fed, and the same operation is repeated until there is no document in the paper feed tray 13.

The change of the sheet discharge speed in the item A-6) may be performed by rotating the motor 8 with the output voltage or by controlling the duty to the motor by the chopper control.

In the above embodiment, the discharge speed is controlled over the entire transparency according to the transparency of the original, but in another embodiment, when the transparency of a predetermined value is set and the value exceeds the threshold, The discharge speed may be controlled in the same manner as in the above embodiment, and when the value is less than that value, the discharge speed may be constant.

FIG. 6 shows the transparency at this time, that is, the transparency detection sensor.
It shows the relationship between the output level of 20 and the discharge speed.
All when the set level V _R following output level paper discharge speed shows that constant as S _R. It has been revealed by the setting level 50g / m ² ~60g / m ² paper our experiments that it is preferable to set between the output level when the. This makes it possible to improve productivity without unnecessarily reducing the discharge speed of an original such as a 60 g / m ² or 80 g / m ² paper whose transparency is slightly lower than the set level (that is, thick).

Further, as shown in FIG. 7, a plurality of predetermined values may be set to change the paper discharge speed stepwise.

Since the tendency of the sheet as a sheet to be turned over or curled up depends on the thickness of the document (this thickness is detected by the transparency), according to the above embodiment, it is possible to prevent the curled up and the curling up. It is possible to prevent a document jam caused by the above.

Next, a second embodiment in which the characteristics of the detected original include not only the paper thickness but also the size will be described. That is, a case where the document feeder has a document size detecting means will be described according to the procedures A-1) to A-7) of the above embodiment.

A-1), A-2), and A-3) are the same as those in the above embodiment.

A-3 ') When a document passes through the feeding path 25, the A-
At the same time as detecting the transparency in the item 3), the sensor 24 detects the document size. That is, the feed amount from the time when the leading edge of the original document reaches the sensor 24 to the time when the trailing edge comes off is counted by the clock disk 9 and the photo interrupter 10. 8th
Shown in the figure is a relational diagram of the output of the output photointerrupter 10 of the sensor 24. The clock pulses of the photo interrupter 10 when the sensor 24 is ON are counted. For example, in the case of a small size original, the output of the sensor 24 is as shown by the solid line, and the clock pulse between A and B is counted. In the case of a large-sized document, the clock pulses output from A to C are counted as indicated by the one-dot chain line, and the clock pulses are counted. Thereby, the document size can be detected. The paper discharge speed is controlled based on the information on the document size and the information on the transparency of the document in the item A-3).

A-4) and A-5) are the same as in the above embodiment.

A-6 ') When the leading edge of the document reaches the paper ejection sensor 19, the paper ejection speed control starts. The speed control method is determined by the document size and transparency in the items A-3) and A-3 '). 9th
Shown in the figure is a flow chart for making that determination. In the first judgment, the information on the document size is first judged. When the document size information in A-3 ') is a small size, the discharge speed control is not performed, and the paper is discharged at the normal transport speed. This is to prevent undesired prolongation of the original replacement time even in the case of a small-sized original even if the original has a high transparency (that is, a thin one), which is less likely to be curled and curled. When the document size information is a large size, the same paper discharge speed control as in the item A-6) is performed.

A-7) is the same as in the above embodiment. Note that the discharge speed control here is performed by the method described in the section A-6), but as described with reference to FIGS. 6 and 7, the discharge speed control is performed when the transparency is equal to or lower than a predetermined transparency. The sheet may be discharged without performing (FIG. 10), or a plurality of predetermined values may be set to change the sheet discharging speed stepwise.

Further, in the second embodiment, the original size is judged first, but in the other embodiments, the transparency is divided first, and if the transparency is lower than the set transparency, the paper is discharged at the normal conveying speed, and then the original is cut. The size may be divided into smaller ones, and those smaller than the set size may be ejected at the normal transport speed, and those exceeding the set size may be controlled to eject at a low speed by controlling the paper ejection speed. .

According to the second embodiment described above, by detecting not only the transparency of the original document but also the size as the characteristic of the original document which is the sheet material, it becomes possible to perform finer control of the original document ejection speed and obtain good ejection. Therefore, the productivity of printed matter can be improved.

Instead of the transparency detecting means 26, a thickness detecting means 500 for directly detecting the paper thickness can be used as shown in FIG. This thickness detecting means 500 is composed of a pair of conveying rollers 17
a, 17b (see FIG. 1). The thickness detecting means 500 includes a pair of conveying rollers 17a, 17b, an auxiliary plate 501,
It is made up of a spring 502 and a sensor 503.

The lower end of the auxiliary plate 501 is rotatably supported with a pin 504 as a fulcrum, and the intermediate conveyance roller 17b is rotatably attached to the lower end of the auxiliary plate 501 and the spring 5 attached to the upper end of the auxiliary plate 501.
The roller 17b is pressed against the drive-side transport roller 17a by 02. A flag portion 501a is provided on the upper end of the auxiliary plate 501 so that it can enter and leave the inside of the sensor 503.

Then, when a thick paper document passes between the pair of conveying rollers 17a and 17b, the flag 501a of the auxiliary plate 501 moves to the left side of the drawing, greatly interrupts the sensor 503, and lowers the output of the sensor 503 ( (See Figure 12). Further, when a thin paper document passes, the output of the sensor 503 becomes higher than that in the case of thick paper. In this way, the thickness of the document is detected and it is determined whether the document is a thin document in which curling or curling is likely to occur or vice versa. The discharge method control based on the detection result is the same as that described above. Further, it is also possible to combine the thickness detecting means 500 and the size detecting means in the same manner as described above.

(Other Embodiments) The present invention is not limited to the document conveying device as in the first and second embodiments described above. FIG. 13 shows the application of the present invention to the copy paper discharge section (A section in the figure) of the copying machine body and the intermediate tray discharge section (B section in the figure) for double-sided copying. The copy paper is fed from the copy paper cassette 701 of the main body 700 by the paper feed roller 702, the image on the photosensitive drum 703 is transferred onto the copy paper, fixed by the fixing device 704 downstream, and ejected onto the ejection tray 707 by the ejection roller 705. It In the case of double-sided copying, after passing through the fixing device 704, the path enters the path 708, is switched back and enters the next path 709, and is stacked on the intermediate tray 711 by the intermediate tray discharge roller 710. Then, the sheet is re-fed to the path 713 by the sheet re-feed roller 712, and is discharged in the same manner as described above.
Discharged on top.

Now, in front of the discharge roller 705, the transparency detection sensor 7
06 and transparency detection sensors 715 are arranged in front of the intermediate tray discharge roller 701. Since the discharge rollers 705 and 710 are controlled by the detection data of the sensors 706 and 715, the discharge states of the discharge tray 7107 and the intermediate tray 711 become good. The details of the control are the same as in the first embodiment described above. Further, the main body registration roller 714 may be provided with the thickness detecting means shown in FIG. 11, and the discharge control of the respective discharge rollers 705 and 710 may be performed based on this detection data. The details are the same as in the second embodiment described above.

FIG. 14 shows an embodiment in which the present invention is applied to a sorter device mounted on a copying machine or the like. The copy paper from the main body 700 is conveyed by the discharge roller 705, and the discharge roller in the sorter 800
It is sequentially discharged to the bin 801 by 802. Here, a transparency detection sensor 803 is installed upstream of the discharge roller 802, and the roller 802 is discharge-controlled by this detection data.
Details of the control are as described in the first embodiment. Further, the main body registration roller 714 may be provided with a thickness detecting means, and the sorter discharge roller 802 may be discharge-controlled based on the detection data. Details of the control are as described in the second embodiment.

As described above, according to the sheet material discharging device of the present invention, the thickness of the sheet material detected by the detecting means for detecting the thickness of the sheet material discharged by the discharging means has a predetermined value. Sheet materials thinner than the specified thickness shall be controlled to be discharged at a slower speed than sheet materials thicker than the specified thickness.For small-sized sheet materials, the discharge speed for discharging again should be lower than the conveyance speed. Since the control for slowing down is not performed, it is possible to change and discharge the sheet material at an appropriate discharging speed according to the thickness and size of the sheet material, without changing the conveying speed. Therefore, it is possible to obtain a good discharge state without curling, curling, and jamming without lowering the efficiency of the entire apparatus.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a discharging and conveying device according to an embodiment of the sheet material discharging device of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is an output of a sensor 26 of FIG. FIG. 4 is a diagram showing the voltage, FIG. 4 is a diagram showing the relationship between the output voltage of the sensor 26 shown in FIG. 3 and the controlled discharge speed, and FIG. 5 is a timing chart for controlling the discharge speed. FIG. 7 is a diagram showing the relationship between the output voltage of the sensor 26 and the discharge speed, and FIG. 8 is the sensor of FIG.
FIG. 9 is a diagram showing the relationship between the output of 24 and the output of the photo interrupter 10, FIG. 9 is a control flow chart diagram used in the second embodiment, FIG. 10 is a modified diagram of the flow chart in the second embodiment, and FIG. FIG. 12 is a diagram showing a thickness detecting means for detecting the thickness of the sheet material, FIG. 12 is a diagram showing the relationship between the thickness of the document as the sheet material and the output voltage of the sensor in FIG. 11, and FIG. 13 is another embodiment. FIG. 14 is a diagram illustrating a case where the present invention is applied to a discharge section of a copying machine main body in an example, FIG. 14 is a diagram illustrating a case where the present invention is applied to a sorter device of a copying machine according to another embodiment, and FIG. ~ Fig. 19 is a diagram showing an example of a document conveying device which is a conventional sheet material discharging device. Explanation of reference numerals 1 ... Original transport device, 2 ... Copying machine 5 ... Drive roller, 6 ... Followed roller 7 ... Full belt, 8 ... Motor 9 ... Clock disk 10 ... Photo interrupter 11 ... Device main body, 12 …… Paper tray 13 …… Paper tray, 14 …… Hinge 15 …… Sub tray 16 …… Sub tray hinge 17 …… Paper ejection roller, 18 …… Bending guide pair 19 …… Sensor, 20… … Feeding roller 21 …… Conveying gate, 22 …… Separating belt 23 …… Conveying roller pair, 24 …… Sensor 25 …… Feed path 26 …… Transparency detection sensor 27 …… Platen standard

Claims (4)

[Claims] 1. A sheet material discharging device for discharging a sheet material to a predetermined position by a discharging means at a discharging speed slower than a transporting speed, and a detecting means for detecting a thickness of the discharged sheet material; A sheet material whose sheet thickness detected by the means is thinner than a predetermined thickness, and which controls the discharging means so as to discharge the sheet material at a slower speed than a sheet material thicker than the predetermined thickness. Material discharging device. 2. The sheet material discharging device according to claim 1, wherein the detecting means detects the thickness of the sheet material by detecting the transparency of the sheet material. 3. The sheet material discharging device according to claim 1, wherein the control means controls the discharging means such that a thinner sheet material is discharged at a slower speed. 4. The control means does not control the discharging speed at the time of discharging to be lower than the conveying speed in the case of a small-sized sheet material.
The sheet material discharging device according to the item.