JPS61200532A - Original feeding device for copying machine - Google Patents

Abstract

PURPOSE:To facilitate the maintenance of a copying machine by detecting the following-up feeding of originals by a sensor and then handling a following original normally without deciding on jam occurrence after a precedent original is scanned. CONSTITUTION:Originals 2 stack on a tray 1 are detected by a sensor 5, one original is sent out to turn on sensors 6 and 7 and stopped abutting on a gate 13, which is elevated when an original feeding device 1 enters a copy ready state. If the sensor 7 does not detects an original within a specific time after the start of the rotation of a roller 10, it is decided that a jam occurs and the operation is stopped. If two originals are fed successively having a time difference and the precedent original is at a copying position, the following original turns on the sensor 6, the jam occurrence is not displayed and the operation is carried on. Therefore, the follow-up feeding of the original which is judged to have jammed is judged automatically and its easily handled.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a document jam prevention device for a copying machine equipped with a self-#J document feeder, and particularly relates to a document jam prevention device for a copying machine equipped with a self-#J document feeder. Even if it detects that a document has been sent from the document tray in the
The present invention relates to a copying machine configured to be able to continue normal copying operations.

(Prior art) In a copying machine equipped with an automatic document feeder, a sensor for the number of stages is provided on the conveyor belt of the automatic document feeder R'a, and a roller for sending out the document from the document tray and a sensor for feeding the nip feed are provided. The feed rollers are sequentially formed to sequentially detect the documents sent out from the document 1-lay according to their conveyance path, and control their conveyance.

However, when the originals are sent out from the original tray, they are not always sent out accurately one by one, and sometimes there are cases where the originals are mixed in, or the originals below are slightly shifted after -1 sheet of originals. You may be forced into a situation.

Among these, double feeding can be dealt with by re-copying when the situation occurs, but if two originals are consecutively fed with a slight deviation, If the length of the document is much longer than the set length, the sensor installed in front of the feed roller may not detect the end of the document. , it will continue to be on.

Therefore, by detecting this state, a document jam signal is output, and the operation of the copying machine is stopped. This indicates that there is a jam inside the automatic document feeder between the original inserted into the automatic document feeder and the original that has stopped in the middle of the transport path. Sometimes it was necessary to open the automatic document feeder, remove the fed document, and then resume the copying operation.

In other words, in conventional automatic document feeders, even if the document is not jammed as described above, if the document is not being fed normally in its transport path, a jam will always occur. It is designed to output a signal and stop the copying operation of the copying machine. Therefore, when the second document is driven in, even if the first document is normally stopped on the platen by the conveyor belt and the next document is stopped and waiting by the gate, It has the disadvantage of not being able to perform copying operations.

(Problems to be Solved by the Invention) The present invention solves the drawbacks of conventional automatic document feeders as described above. is set on the platen by the conveyor belt, and even if it detects that the next original is stopped by Go 1~, the copying operation can be continued without outputting the second original. is intended to provide.

(Means and effects for solving the problems) The copying machine of the present invention includes an automatic document feeder formed to cover the top of the platen, and a document feeder formed at a stage before the automatic document feeder. It consists of

The document feeding device consists of a document tray, a guide plate following the document tray, and a document feeder that feeds documents one by one from the document tray.
It is composed of a feed roller, a second feed roller provided at a predetermined interval from the first feed roller, a skew roller, a gate, etc., and furthermore, a plurality of sensors are provided at predetermined positions on the conveyance path. , detects the state of conveyance of the original, and inputs the detection signal to a control device that controls the driving of each device for copying operations, so that copying operations can be performed according to a predetermined program. I have to.

In the automatic document feeder of the present invention, the second document is also driven by the first feed roller, and when the first document is positioned on the platen, the next document is stopped before the gate. If this state is detected, after reading the first document, the document that has been stopped midway is fed onto the platen, and the copying operation is continued.

Therefore, in the automatic document feeder of the present invention, even if a slight abnormality occurs such as the document being pushed back in during the process of conveying the document, the automatic document feeder does not immediately display a jam indication, but according to a predetermined program. processing so that copying operations are not interrupted.

(Embodiment) To explain the configuration of the apparatus of the present invention according to the illustrated example, the automatic document feeder of the present invention includes an automatic document feeder 15, a document I/ray 1, , a guide plate 3 connecting therebetween, and feed rollers 10 and 11 for conveying the original 2.

First, in the document tray 1, the guide plate 3 on the lower surface of the document tray 1 is
A hole 7L4 is formed on the plate member following the hole, and a sensor 5 is provided facing the hole. Further, a feed roller 10 is formed above the document tray 1 to feed the documents 2 on the document tray 1 one by one from the top.

As the feed roller 10 used in the document editing of the present invention, a disc-shaped one having a configuration similar to that of a conventionally used feed roller may be used. It is preferable to use a device that includes a plate-shaped rotating member and conveys the document in a state where the document is squeezed by the rotating member.

The second feed roller 11, which is provided following the document tray 1, has a pair of rollers sandwiching the document conveyance path, and is formed so that the document 2 can pass between the rollers. A hole 7L4a is formed in the guide plate 3 in front of the feed roller 11, and a sensor 6 is provided facing the hole 4a.

In addition, a gate 1 is placed in front of the automatic document feeder 15.
3 is formed to be movable up and down, and a skew roller 12 is provided in front of the guide plate 3. A hole 4b is provided in the guide plate 3, and a sensor 7 is provided facing the hole 4b. The skew roller 12 has a cylindrical or disc-shaped [cola body with protrusions made of a relatively soft elastic material protruding from the periphery of the skew roller 12, and its rotation causes the document stopped at the gate 13 to 2 to the conveyor belt 16.

The automatic document feeder 15 of the present invention, like the conventional automatic document feeder, transports a conveyor belt 16 having protruding pads 17 at predetermined intervals from a drive roller 1.
8, and the conveyor belt 1
6 covers the platen 20 of the copying machine, and the entire automatic document feeder 15 is moved through the hinge so that the I! It is designed to be movable.

The device of the present invention having the above-mentioned configuration is driven as follows. That is, when a document 2 is placed on the document tray 1, the sensor 5 detects its state and sets the automatic document feed mode.

Therefore, when the copy start button is pressed, the first feed roller 10 and the second feed roller 11 start rotating, feed one sheet of the original 2, and the original m2
When passing over the document 6, the sensor 6 is turned on, and after the document advances further and the sensor 7 is turned on, it hits the gate 13 and stops.

Next, when the automatic document feeder 15 is ready for copying, the gate 13 rises, the skew row 512 rotates a little, and the document 2 is inserted into the entrance of the automatic document feeder 150. In this state, the conveyor belt 16 is driven to convey the document 2 onto the platen 20 and set it at the copying position.

The sensor 6 is turned off when the document 2 is conveyed by the conveyor belt 16 and the trailing edge has finished passing through, or when the distance between the sensor 6 and the gate 13 is greater than the length of the document 2. is set to be turned off when the original 2 is conveyed by the feed roller 11 and the end portion thereof has passed.

In the apparatus of the present invention, if the sensor 7 does not detect the document 2 within a predetermined time after the first feed roller 10 starts rotating, it is assumed that a jam has occurred in the middle of the conveyance path. Displaying the image and stopping the operation of the copying machine is similar to that of a conventional copying machine.

Therefore, in normal operation, the state of the document is detected by a plurality of sensors, and each transport device is controlled based on the detected information, but in the apparatus of the present invention, the above-mentioned In addition to the normal control of a copying machine as described above, when it is detected that two originals are fed from the original tray with a slight deviation by the feed roller 10, the state is accurately determined. The point is that the jam signal can be processed without affecting the output.

In other words, when the first feed roller 10 feeds two originals 2 with a slight deviation, the previous original turns on the sensor 6 and the gate +J-7 in turn, and the gate 1 turns on.
It is stopped by 3. Next, Goo 1-13 was interposed,
The skew row 512 starts rotating and transfers Moe's original to the transport belt 16 and transports it to the copying position on the platen 20, but the later original is stopped on the sensor 6.
Since the sensor 6 is kept on, it is determined that an abnormality has occurred in document feeding.

Therefore, after the copying operation of the previous original is completed, the first feed roller 10 is rotated half a rotation, and the second feed roller 11 is rotated to transport the original that has stopped midway, and I try to send up to 13.

This transport control is performed using a control device (not shown), and by changing the program of the copying machine using a control device such as a microcomputer for controlling the copying operation. It is now possible to do so.

The control operation of the copying machine of the present invention will be explained based on a flowchart as shown in FIG. 2. First, when the original 2 is placed on the original tray 1 in step A, the sensor 5 detects its state. Set the copier to automatic document feed mode. Next, when you press the start button of 'f4''j m, the first feed roller 10 and
When the second feed roller 11 starts rotating and starts conveying the document 2 from the document tray 1, and the leading edge of the document is detected by the sensor 6 in step C, the first feed roller 10 starts rotating. Stop rotation. The second feed roller 11 continues to be driven and conveys the original 2 until it hits the goo-13, and when the sensor 7 detects the original 2, the driving is stopped.

Next, when copying using the automatic document feeder 15 becomes possible in step D, the conveyor belt 16 is activated to stop the document at a predetermined position on the platen 20! ′
Copying is performed, but even in that case, if the next document driven into the document conveyance path remains, the sensor 6 does not turn off and continues to be on.

Therefore, when the sensor 6 is turned off in step E, the process moves to step F, where it is determined whether or not there are still originals left on the original tray 1. If there are originals left, the next copying operation is started. If there are no remaining originals, copying ends.

Furthermore, when the sensor 6 is in the ON state in step E, it is determined that the original has stopped in the middle of the conveyance path, and the process moves to step G, where the operation of copying the previous original is started. After finishing, the first feed roller 1
0 by half a rotation, and the second feed roller 11
The originals stopped in the middle of the conveyance path are conveyed to Groups 1 to 13 by normal rotation.

Then, when the operation in step G is completed, step D
Then, the predetermined processing operation is performed. However, even if the predetermined operation is performed in step G, for example, when the document is not detected by the sensor 7 within a predetermined time after the first feed roller 10 starts rotating, If the sensor 6 does not turn off even after the document is transported, the document is not being transported normally, so it is determined that a jam has occurred, and a jam signal is issued and the copying operation is started. The printer stops, notifies the operator, and allows the operator to process the jammed document.

In the above-described embodiments of the present invention, the automatic document feeder and the device for supplying documents to the automatic document feeder are described as having the same configuration as a conventionally used copying machine. However, the device of the present invention is not limited to the above-described embodiments, and can also be applied to devices using other types of conveyance devices, and furthermore, the control steps thereof can be Of course, it is also possible to change the configuration according to the configuration of the copying machine.

(Effects of the Invention) Since the device of the present invention has the above-described configuration, it can automatically determine whether or not a document is being fed, which was determined to be a jam in conventional automatic document feeders. However, this process can be easily performed, and maintenance of the copying machine can be facilitated.

Furthermore, the apparatus of the present invention can be applied by only slightly changing the program of the control device installed in the copying machine and without changing the other configurations, which particularly increases the cost of the copying machine. There's nothing to do.

Furthermore, the copying machine equipped with the automatic document feeder of the present invention is extremely easy to operate, and anyone can easily operate the copying machine.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of an automatic document feeder of the present invention, and FIG. 2 is a flowchart showing the control operation of the copying machine of the present invention. Reference numerals in the figure 1...Original tray, 2...Original, 3.
...Guide plate, 4...Hole, 5-7...
... Sensor, 10-11 ... Feed roller, 12 ... Skew roller, 13 ...
・Goo!・, 15... Automatic document feeder, 16
......Transport belt, 17...Pad, 1
8... Drive roller, 20... Platen. (1 other person)

Claims (1)

[Claims] Two sets of feed rollers are provided in front of the document conveyance belt, the first feed roller is used to take out the document from the document tray, and the second feed roller is used to feed the document to the document conveyance belt. In the configured automatic document feeder, when the sensor formed near the second feed roller detects that the document has been further fed, after scanning the first document sent,
A copying apparatus characterized in that the control device controls the operation of the two sets of feed rollers so that only the document stopped midway is sent to the automatic document feeder, thereby preventing the occurrence of a document jam. The machine's automatic document feeder.