JPS60113223A - Automatic original feeder - Google Patents

Abstract

PURPOSE:To bring a conveyed original into contact automatically by starting taking a copy without projecting a register gate which stops the original on platen glass in contact with the platen glass. CONSTITUTION:A CPU21 is connected to ROM23, RAM24, a belt running motor driving circuit 25, a plunger solenoid driving circuit 26, and a copy control circuit 27. The register gate 7 is normally in a projection state, and stops the original which is sent automatically and then lowers the projection part below the platen glass 2 before a copy is taken. Therefore, the automatically sent original is brought into contact with on the glas 2 excellently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic document feeder in an electronic copying machine.

[Prior art]

Some electronic copying machines are designed to automatically feed an original set next to a platen cover onto a platen glass with the platen cover closed, and to automatically eject the original after copying is completed.

FIG. 1 shows a part of such a conventional electronic copying machine. In this electronic copying machine, a platen glass 2 is provided at the center of the upper part of the main body 1, a document set B3 is provided on the right side of the platen glass 2, and a document discharge section 4 is provided on the left side. A platen cover 5 is provided above the platen glass 2 so as to be openable and closable around its rear end. The platen cover 5 is provided with a belt 6. The belt 6 receives the driving force of a motor (not shown) provided in the main body 1 of the copying machine via a universal joint (also not shown), and travels in the direction of the arrow.

A resist gate 7 is provided on the left side of the platen glass 2 so as to be rotatable about a horizontal axis (not shown). The resist gate 7 is normally protruded appropriately above the platen glass 2 as shown in FIG.
As shown in the figure, the surface is substantially flush with the surface of the platen glass 2.

Let us now assume that the platen cover 5 of this electronic copying machine is closed, and in this state, the original 8 is automatically fed and copied. In this case, the original 8 is first set in the original setting section 3, and its leading end is inserted between the platen glass 2 and the belt 6 as appropriate. Then, a switch (not shown) for detecting the document set is pressed by the leading edge of the document 8 and turned on, setting the apparatus to automatic document feeding mode.

In this state, when a copy start button on an operation panel (not shown) is pressed, the belt 6 starts running and feeds the original 8 onto the platen glass 2. The belt 6 stops running at the leading edge of the document 8. As a result, the original 8 is set at the desired position on the platen glass 2. When the original 8 is set in this manner, the scanning unit 9 provided below the braten glass 2 starts driving at this timing and copies are made. When the specified number of copies are completed, the plunger solenoid is driven at this timing, and the registration gate 7 changes from the state shown in FIG. 2 to the state shown in FIG. 3. This releases the registration gate 7 from locking the document 8. Next, the belt 6 starts running again, and the document 8 is discharged to the document discharge section 4. When the document 8 is ejected, the plunger solenoid returns to its original non-driven state.
The resist gate 7 also returns to its original state shown in FIG.

At the point when the original 8 is sent out to the original output section 4, the next original 8
is set in the document setting section 3 and the switch for detecting document set is turned on, the next document 8 is fed in simultaneously with the feeding of the previous document 8. Therefore, the copy start button only needs to be pressed once at the beginning. If the document 7 is not set on the document setting section 3 even after a certain period of time has elapsed since the document 8 was delivered to the document discharge section 4, the apparatus enters a stop mode.

On the other hand, when performing normal copying with this electronic copying machine, the platen cover 5 is opened, the document 8 is directly set at a desired position on the platen glass 2, and then the platen cover 5 is closed. In this state, the switch for detecting the document set is off, and the apparatus is in the normal copying mode. Therefore, in this case, even if the copy start button is pressed, the belt 6 remains stopped and normal copying is performed.

By the way, in such an electronic copying machine, after copying is completed, the registration gate 7 is placed in the state shown in FIG. 3, and the original document 8 is ejected. Therefore, at the time of copying, the belt 6 is pushed up by the resist gate 7, and a gap is created between the belt 6 and the platen glass 2. As a result, the leading edge of the document 8 may be lifted, creating a shadow, and the image quality may be inferior. This was particularly noticeable when the document 8 was thin paper. For example, when making a full-size copy of the document 8 having the image information indicated by diagonal lines in FIG. Only the image at the tip 13 of 12 is reduced, and the image quality is inferior. Further, when copying the recording paper 12 obtained in this manner, only the image at the leading edge 15 of the next recording paper 14 is further reduced as shown by diagonal lines in FIG. 4(C). In particular, when reduction copying is repeatedly performed, only the leading edge of the finally obtained copy image is abnormally reduced, resulting in a significantly inferior image quality.

[Purpose of the invention]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an automatic document feeder that can bring an automatically fed document into close contact with a platen glass.

[Structure of the invention]

In the present invention, after the document that is automatically fed is brought into contact with the registration gate and set at the desired position on the platen glass, the registration gate is set in a state where it does not protrude above the platen glass. Copying is started in this state.

〔Example〕

The present invention will be described in detail below with reference to Examples.

FIG. 5 shows the automatic document feeder of this embodiment. The CPU (central processing unit) 21 is connected to the data bus 2
2, a read-only memory 23, a random access memory 24, and a belt running motor drive circuit 25.
, a plunger solenoid drive circuit 26, and a copy control circuit 27, respectively. This device is provided with a copy start button 28 and a switch 29 for detecting a document set as input means, and a data bus 2.
2 to input data.

Next, the operation of this device is shown in a flowchart (Figure 6) and Figures 1--
This will be explained with reference to FIG. When this device is in the stop mode, the CP[J21 monitors whether the switch 29 for detecting the document set is turned on (step ■).
. While it is not turned on (N), the CPU 21 puts the apparatus in the normal copying mode (step 2). The original 8 is set in the original setting section 3, and the switch 29 for detecting the original set is pressed.
When turned on (step ■; Y), the CPU 21 sets the apparatus to automatic document feeding mode (step ■).

In this state, the CPU 21 monitors whether or not the copy start button 28 is pressed (step 2).

When the copy start button 28 is pressed (Y), the CPU 2
1 supplies a drive signal to the belt running motor drive circuit 25. This drives the motor 30 for belt running,
The belt 6 starts running, and the document 8 is transferred to the platen glass 2.
Send it upwards (step ■). When the leading edge of the document 8 contacts the registration gate 7, the CPU 21 stops the belt 6 from running at this timing. As a result, the original 8 is set at the desired position on the platen glass 2.

Next, CPIJ21 is the plunger solenoid drive circuit 26
The drive signal is supplied to the As a result, the plunger solenoid 31 is driven, and the resist gate 7 changes from the state shown in FIG. 2 to the state shown in FIG. 3 (step 2; Y). Therefore, the original 8 is brought into close contact with the platen glass 2 in a good manner. Next, the CPU 21 supplies a copy start signal to the copy control circuit 27, thereby starting copying (step 2).

The CPU 21 monitors when copying is completed (step 2). When copying is complete (Y
), the CPU 21 causes the belt 60 to start running, and the document 8 is discharged (step (2)). When the ejection of the original 8 is completed, the CPU 2' 1 returns the registration gate 7 to the original state shown in FIG. 2 (step @). At this time, the CPU
21 monitors whether the switch 29 for detecting the document set is turned on (step 2). When it is on (Y), that is, when the next original 8 is set in the original setting section 3, the next original 8 is fed in at the same time as the previous original 8 is ejected (step ■), Thereafter, copies are made in the same manner as above, and then they are automatically ejected.

On the other hand, if the switch 29 for detecting the document set is off (step 2; N), copying is completed and the apparatus enters the stop mode.

In the above embodiment, the registration gate 7 is normally set to the state shown in FIG. 2, and after the document 8 that is automatically fed is stopped and before copying is started, the registration gate 7 is set to the state shown in FIG. 3. It is not limited to this. For example, the registration gate 7 is normally set to the state shown in FIG. 3, and when the switch 29 for detecting document set is turned on or the previous document 8 has been ejected, the state is set to the state shown in FIG. 2, and the document is automatically fed. After stopping the coming original 8 and before copying starts, the third
The state shown in the figure may be adopted.

In this way, since the registration gate 7 is normally in the state shown in FIG. 3, the original 8 can be kept in close contact with the platen glass 2 even when the platen cover 5 is opened and closed to perform normal copying.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to bring the automatically sent document into close contact with the platen glass, thereby improving image quality. Moreover, since it can be done electrically without changing the machine, there is no increase in cost.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram showing a part of a conventional electronic copying machine, Figures 2 and 3 are diagrams showing each state of the resist gate of the same copying machine, and Figure 4 is a diagram showing the state of the resist gate of the same copying machine. FIG. 5 is a block diagram of an automatic document feeder according to an embodiment of the present invention, and FIG. 6 is a flow chart for explaining the operation of the automatic document feeder. 2...Platen glass, 3...Document setting section, 4...Document discharge section, 5...Platen cover, 6...Belt , ? ...Regist Gate, 8...Manuscript, 21...CPLJ. 23...Read-only memory, 24...
...Random access memory, 26...
Plunger solenoid drive circuit, 27... Copy control circuit, 28... Copy start button, 29...
・Switch for detecting document set, 30... Belt running motor, 31... Plunger solenoid. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Ume Yuki Yamauchi 1 Figure 4 (A) (Japanese) (C) Figure 5

Claims (1)

[Claims] A document setting section is provided next to the platen glass, and when the platen cover is closed, a belt provided therein automatically feeds the document set in the document setting section onto the platen glass, and copying is completed. In an electronic copying machine that automatically ejects the document later, the platen glass is provided on the document ejection side, and the document that is automatically fed in a state that is protruded above the platen glass is placed on the platen glass. a resist gate for stopping at a desired position; a switching mechanism for selectively switching the resist gate between a first state in which it projects above the platen glass and a second state in which it does not project; The registration gate is in a first state when the original is automatically fed and is in a second state before copying is started;
An automatic document feeder comprising: a control section that controls the switching mechanism.