JPH0361178B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document feeding device that feeds a document in an apparatus that makes copies while feeding the document.

Conventionally, when a document is fed diagonally using this type of document feeder, if the document is fed diagonally, the edge of the document may get caught on document conveyance means such as a feed roller, resulting in damage to the document. Sometimes.

Therefore, a method has been proposed in which a switch is provided to stop the document transport means, and when the document is fed diagonally, the operator operates this switch to suddenly stop document feeding to prevent damage to the document. ing.

However, even with this configuration, due to operator inexperience, the switch may not be operated and the document may be damaged, and even if the switch is operated, the document may get caught in the document transport means. Since the document remains in the original state, it is inconvenient to take out the document.

The present invention has been made in view of the above-mentioned circumstances, and it is provided that the document is fed diagonally to such an extent that there is a risk that the edge of the document may get caught on the document conveying means such as a feed roller and the document may be damaged. If there is no risk of damage to the original, the original is fed in to improve work efficiency; if there is a risk of damage to the original, the original transport means is reversely driven to remove the original. To provide a document feeding device which prevents documents from being damaged by automatically discharging documents from an entrance side and eliminates the need for an operator to take out documents manually. In a document feeder that conveys a document 9 from an entrance 4a thereof to a document table 2 along a conveyance path, a plurality of document detectors 7 and 8 are arranged at intervals on the conveyance path of the document 9. , the time from when any one of the plurality of document detectors 7 and 8 detects the document 9 to when the other document detector detects the document is determined according to the degree of inclination of the transported document 9. determination means for determining whether or not a set time has been exceeded, and after the determination means detects the document 9 by one of the document detectors, the other document detector detects the document 9. When it is determined that the elapsed time has exceeded the set time, the document conveyance means 5 is driven in a direction in which the document 9 leaves the document table 2, and one of the document detectors detects the document 9 by the determination means. When it is determined that the time from when the document 9 is detected until the document 9 is detected by another document detector does not exceed the set time, the document conveying means 5 is driven in the direction in which the document 9 is directed toward the document placing table 2. The invention is characterized in that it includes a control means for controlling.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic plan view of the entire copying machine body 1.
A document feeding device 3 is provided on one end edge 2a side of the document placing table 2 provided at the document table 2 .

The document feeding device 3 is connected to an entrance 4 of the main body 4 of the device.
A document transport means 5 such as a document feed roller and a document detector 6 (hereinafter referred to as the first switch 6) such as a switch are provided on the side a, and the exit 4 is located closer to the document transport means 5 than the document transport means 5.
At the b side position, a plurality of first and second document detectors 7 and 8 (hereinafter referred to as second and third switches 7 and 8) such as switches are located at the same position in the document feed direction orthogonal to the document feed direction X. They are placed at intervals. 9
is the manuscript.

FIG. 2 is a circuit diagram of the drive control means for the document conveying means 5, and the output side of the first switch 6 is connected to the entrance side 10a of the OR gate 10;
b is connected to a transistor 12 provided in the power supply circuit of the first relay 11, and its contact 11a is connected in series with a contact 14a of the second relay 14 provided in the electric circuit of the drive motor 13 of the document transport means 5. It has been done. 15 is a delay.

FIG. 3 is a circuit diagram of the diagonal feed determination means, and the second and third switches 7 and 8 are the inlet side 16a of the OR gate 16 and exclusive OR gate 17,
16a, 17a, and 17a, respectively,
The output side 16b of the OR gate 16 is a timer circuit 18
Exclusive OR gate 17
The output side 17 of is inputted to a timer circuit 18 as a reset signal.

The output side of the timer 18 is connected via a flip-flop 19 to a transistor 20 provided in the power supply circuit of the second relay 14.

Next, the details of each circuit diagram and the operation will be explained.

When the original 9 is inserted into the entrance 4a, the first switch 6
turns on, a signal is sent to the input side 10a of the OR gate 10, a signal is output from the output side 11b, the transistor 12 turns on, and the first relay 11 turns on.
Turned on. As a result, the contact 11a is turned on and the drive motor 13 is energized. At this time, the second and third switches 7 and 8 are OFF, so the second relay 1
4 is OFF, its contact 14a is on the normal rotation side (A), and the drive motor 13 rotates in the normal direction, so that the document 9 is fed.

Thereafter, the original 9 steps on the second and third switches 7 and 8 to turn them on.

As a result, the output of the OR gate 16 becomes an H signal, turning on the timer circuit 18.

At this time, the second and third switches 7 and 8 are activated simultaneously.
When turned on, exclusive OR gate 17
In order to maintain the L signal, the timer circuit 18 continues to be reset. For this reason, the flip-flop 19 maintains its output L signal with the initial reset applied at the start, so the transistor 2
0 is OFF.

In this manner, when the original 9 is normally fed and moved, the original transport means 5 continues to be driven, and the original 9 is sequentially fed toward the original placing table 2.

Then, when the trailing edge of the document 9 crosses the first switch 6, the first switch 6 is turned off, and after that, when the time determined by the delay circuit 15 has elapsed, the OR
The output of the gate 10 becomes an L signal, the transistor 12 is turned off, and the contact 11a of the first relay 11 is closed.
Since the drive motor 13 is turned OFF and stopped, document feeding is completed.

Further, as shown in FIG. 4, when the original 9 is fed in in an oblique state, the first
Since the switch 6 is turned on by the document 9, the drive motor 13 is driven to rotate normally, the document conveying means 5 is fed, and the document 9 is fed.
The switch 8 is turned on and the timer circuit 18 is turned on, but since the second switch 7 is turned off at this time, the output of the exclusive OR gate 17 becomes an H signal, and resetting of the timer circuit 18 is prohibited and the timer circuit 18 is turned on. The circuit 18 performs a counting operation, and if the timer circuit 18 reaches a predetermined count before the document 9 turns on the second switch 7, the output of the timer circuit 18 becomes an H signal and sets the flip-flop 19.

In other words, the timer circuit 18 takes the time from when the third switch 8 is turned on to when the second switch 7 is turned on.
When the set time is exceeded, the output of the timer circuit 18 becomes an H signal, and one of the second and third switches 7 and 8 is turned ON by the OR gates 16 and 17 and the timer circuit 18.
A determining means is formed that outputs a signal when the other is not turned on within a predetermined time after the first one is turned on.

When the flip-flop 19 is set, the transistor 20 turns on and the second relay 14 turns on, so
The contact 14a is switched to the reverse position (b), and the drive motor 13 is driven in the reverse direction, so that the feed roller 5 is rotated in the reverse direction and the document 9 is ejected from the inlet 4a.
The contact point 14a forms a control means for driving the document conveying means 5 in the opposite direction.

In this way, the fact that the time from when the third switch 8 is turned on to when the second switch 7 is turned on is longer than the set time of the timer circuit 18 means that the original 9
This means that the document 9 has been slanted by a certain angle or more. In this case, the document conveying means 5 is driven in the opposite direction and the document 9 is ejected from the entrance 4a, thereby preventing the document 9 from being damaged.

Further, the original document 9 is automatically ejected from the entrance 4a by the document conveyance means 5 without having to manually pull it out from the document conveyance means 5 as in the conventional case, which simplifies the operation.

Since the document feeding device according to the present invention is configured as described above, whether the document 9 being conveyed by the document conveying means 5 toward the document placing table 2 is being fed diagonally in a diagonal state of more than a predetermined value or not. judge,
If it is less than a predetermined value, the document is forwarded in order to improve the efficiency of the work, and if it is more than a predetermined value, the document transport means 5
The document 9 is automatically ejected from the entrance side by driving the document 9 in the opposite direction, and the document 9 can be prevented from being damaged, and the operation is easy without requiring the operator to take out the document 9 manually. It becomes easy.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a general schematic plan view, FIG. 2 is a drive control circuit diagram of the document conveying means, FIG. 3 is a circuit diagram of the diagonal feed determination means, and FIG. 4 is an explanatory diagram of a diagonal feeding state. 2 is a document placement table, 4a is a document feeder at the entrance of the main body, 5 is a document feeder, 7 and 8 are document detectors, 9
is the manuscript.

Claims (1)

[Scope of Claims] 1. In a document feeder that conveys a document 9 from its entrance 4a to a document table 2 along a conveyance path, a plurality of document detectors 7 are arranged at intervals on the conveyance path of the document 9. , 8, and the time from when any one of the plurality of document detectors 7 and 8 detects the document 9 to when the other document detector detects the document is determined by the inclination of the transported document 9. and determining means for determining whether or not a set time set according to
When it is determined that the time until the detection of the document has exceeded the set time, the document transport means 5 is moved in the direction in which the document 9 leaves the document table 2, and the document 9 is moved toward the entrance 4a.
The document 9 is driven until the document 9 is ejected, and the determination means determines that the time from when one of the document detectors detects the document 9 to when the other document detector detects the document 9 does not exceed the set time. A document feeding device characterized by comprising a control means for controlling the document conveying device 5 in a direction in which the document 9 moves toward the document placing table 2 when the determination is made.