JPS6213075Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic document feeder used in a copying machine or the like, and more particularly to a semi-automatic document feeder (hereinafter referred to as SADH) in which an operator inserts sheets one by one.

As shown in FIGS. 1 and 2, the conventional well-known SADH includes an original set tray 1, an original feed roller 2, a pre-registration gate 3, an original transport belt 4, an original registration gate 5, and a platen glass 6.
and a document insertion detection sensor 7.

In such conventional SADH, the manuscript is
When the sheet is set on the sheet set tray 1 and the sensor 7 detects this, the roller 2 begins to rotate.
This roller 2 is set diagonally with respect to the insertion direction, and by pressing the inserted document against the gate 3 and guide 8, it functions to correctly set the document inserted diagonally with respect to the direction of travel. ing.

The original hit against gate 3 and guide 8 is
The roller 2 stops traveling by slipping on the document. Before long, the gate 3 is opened and the document is sent under the belt 4 while following the guide 8. At this time, the belt 4 begins to rotate, and the document is conveyed on the platen toward the gate 5 while being sandwiched between the belt and the platen glass 6.

When the leading edge of the document hits the guide 5, the rotation of the belt stops and the setting of the document is completed.

Next, a normal copying cycle begins, but when the next original is set on tray 1 during that copying cycle, that original remains inserted into gate 3 and guide 8 as described above. Slipped and waiting. When the copying operation is completed, the gate 5 is opened and the belt 4 is then rotated to discharge the copied original. At the same time, the document waiting at the entrance gate 3 is set on the platen 6 by the above-described operation.

As described above, in the conventional SADH, while the previous document is being used for copying, the next document is placed against the gate 3 and the guide 8 and waits in a stopped state, and the roller 2 is placed between the document and the document. However, especially in the case of thin originals, there is a drawback that the originals may buckle without slipping.

The present invention improves this drawback by rotating the roller 2 for a certain period of time when a new document is inserted, and then stopping the roller 2.

The present invention will be described in detail below with reference to the drawings. FIG. 3 is a block diagram of one embodiment of the present invention, and FIG. 4 is a time chart thereof. When the first document is inserted into the document tray 1 at time _t0 , the output A of the sensor 7 becomes L level, the output of the one shot multi 11 becomes L for a certain period of time, and the timer 12 is activated.

As a result, the output of the OR circuit 13 becomes H level during the scheduled time T, and the driving relay 1 of the roller 2
4 is energized, and the document passes through the pre-registration gate 3.
will be transported towards. Preferably, the scheduled time T is selected to be approximately equal to the time required for the document to hit the pre-registration gate 3 and be skew corrected. When the scheduled time has elapsed, timer 1
The output of 2 is turned off, so the OR circuit 13
The output becomes L and the roller 2 stops.

Next, when the print switch S is temporarily closed, the flip-flop 16 is set and its Q output goes high.
Therefore, the control relay 17 for the gate 3 is energized and the gate 3 is opened, and the OR circuit 13 is activated.
The output becomes H and the roller 2 is driven. Meanwhile, the flip-flop 18 is also set, the drive relay 19 for the belt 4 is energized, and the first document is conveyed onto the platen 6. At the same time, the output of the one-shot multi 23 temporarily becomes H, so that the drive relay 20 for the gate 5 is temporarily energized, and the copied original is ejected.

When the first document passes the sensor 7, the flip-flop 16 is reset, so the drive relay 17 is deenergized, the gate 3 is closed, and the roller 2 is also stopped at the same time. A belt stop signal B is generated from the main body control circuit 21 just as the document is conveyed over the platen glass 6 and hits the registration gate 5. This resets flip-flops 18 and 22 and deenergizes belt drive relay 19. Thereafter, a copy cycle begins at time _t1 .

If the second document is inserted into the tray 1 before the first copy cycle is completed, the output A of the sensor 7 becomes L and the roller 2
The driving relay 14 is energized for a scheduled time T. As a result, the document is conveyed to a location close to or hitting the pre-registration gate 3.

When the copying of the first original is completed, the SADH copy end signal D from the main body control circuit 21 becomes L. As is clear from the above, the gate 5 is thereby opened and the first original is ejected, and at the same time the roller 2 and the belt 4 are driven to convey the second original to a specified position. After that, the same operation is repeated.

As explained above, according to the present invention, the document inserted into the document tray 1 is conveyed by the roller 2, but when the document hits the pre-registration gate 3 or is conveyed close to it, the roller 2 stops. Since it is automatically stopped, a document inserted diagonally can be set correctly in the direction of travel, and even if the paper of the document is thin, buckling or damage will not occur.

It is clear that the timer 12 in FIG. 3 can be omitted and the one-shot multi 11 can perform the timer function, but if the timer 12 is provided, the driving time of the roller 2 can be arbitrarily selected to be long. There is.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the automatic document feeder, FIG. 2 is a sectional view taken along the line 2, FIG. 3 is a block diagram of an embodiment of the present invention, and FIG. 4 is a time chart thereof. 2...Document feed roller, 3...Pre-registration gate, 4...Document transport belt, 6...Platen glass, 7...Document insertion detection sensor.

Claims (1)

[Scope of Claim for Utility Model Registration] A document set tray, a document conveyor belt provided on a platen glass disposed downstream of the document set tray, and a feed roller that feeds the document placed on the document set tray to the conveyor belt. a pre-registration gate provided between the conveyor belt and the feed roller in a direction perpendicular to the traveling direction of the conveyor belt; and a pre-registration gate provided on a side surface of the document set tray in parallel to the traveling direction of the conveyor belt. A guide, a sensor that detects a document set on the feed roller and starts the feed roller based on the detection output, and a timer that stops the feed roller activated by the sensor after a predetermined time. . An automatic document feeder, wherein the feed roller is arranged to convey the document obliquely toward a pre-registration gate and a guide.