JPS5814158A - Original automatic feeding device - Google Patents

Abstract

PURPOSE:To drive a carrying belt continuously to carry an original to an ejection path again by the signal due to a detector if the original is stuck to the carrying belt. CONSTITUTION:In the normal case, an original inserted between a pickup roller 3 and a paper feed roller 4 is sent onto an original platen glass 47 by a carrying belt 15 and is positioned, exposed, and ejected through rollers 20 and 21; however, when the original is stuck to the belt by charging or the like and is not ejected to pass through a part 56 between the belt 15 and an ejection guide 55, the abnormality is detected by a sensor 54. By this abnormality detection signal, the rotation of the pickup roller 3 is stopped to inhibit the insertion of originals, and the belt 15 is driven continuously until the original passes through ejection rollers 20 and 21 normally and is ejected. If the sensor 54 detects the abnormality again, a jam signal is issued to stop the driving of the belt.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic document feeder of an image forming device such as a copying machine or a recording device, and more particularly, to an automatic document feeder for an image forming apparatus such as a copying machine or a recording device, and more specifically, for example, an automatic document feeder for automatically aligning a copied document on a four-light document placing table (platen). , relates to an automatic document feeder such as a copying machine that automatically ejects a document after copying is completed.

The following is an explanation using a copying machine as an example.

Conventionally, this type of device has been used to detect problems such as when the original is stuck to the original transport belt due to charging or the like, or when the original is curled upward. ) could get stuck between the upper cup and the document conveying belt, damaging the original, and the upper cup (C) had to be removed when taking out the snowy original.

The present invention eliminates the drawbacks of the above-mentioned conventional examples. 1) Even if the original accidentally gets between the upper cover and the original transport belt, the original can be removed without damaging the original, and without removing the 2nd cover. An object of the present invention is to provide an automatic document feeder that allows document take-out.

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

FIGS. 1 and 2 show an embodiment of the present invention.

FIG. 1 is a sectional view showing one embodiment of the automatic sheet document feeder of the present invention. In FIG. 1, reference numeral 1 denotes an entrance tray on which sheet originals are stacked, and the sheet originals 2 on the entrance tray 1 are stacked with the lower side in the figure facing up (image surface). The pickup roller 3 is made of a rubber-based material with a large coefficient of friction, and is centered around the feed roller shaft 10.
- Swings in direction B. A feed roller 5 (made of the same material as the pickup roller 3) is fixed to the feed roller shaft 10, and rotates as the feed roller shaft 10 rotates, and this rotation is controlled by a gear (not shown) so that the pickup roller 3 As a result, the feed roller 5 and the pickup roller 3 are configured to rotate in the same direction and have the same circumferential speed. Further, the rotation shaft (not shown) of the first paper feed roller 4 is fixed to the paper feed tray 1, and the sheet document 2 is inserted between the pickup roller 3 and the first paper feed roller 4, and the pickup roller 3 , is configured to be driven when the document is pushed and conveyed.

Also, six second paper feed rollers are configured to be slidable so as to have a pressing force toward the paper feed roller shaft 10.
When the sheet document passes between the feed roller 5 and the second feed roller 6, it is configured to be driven. ] Up,
The pickup arm 8 swings about the pickup arm shaft 7 as a swing axis, and has a U-shaped 1pJ9a at one end. The shaft 9b is fixed to the paper feed arm 9, which swings about the feed roller shaft 10 as a swing shaft. Therefore, when the pickup arm shaft 7 swings and rotates counterclockwise, the pickup arm 8 swings counterclockwise, and the paper feed arm 9 also swings around the feed roller shaft 10.
Rock counterclockwise. At this time, pick up roller 3
is separated from the first paper feed roller 4. Next, when the pickup arm shaft 7 swings clockwise, the pickup arm 8 swings clockwise, and the paper feed arm 9 also swings clockwise about the feed roller shaft 10. At this time, the pickup roller 3, which has been separated from the first paper feed roller 4, comes into pressure contact with the first paper feed roller 4, and when a sheet document 2 is present, the pickup roller 3 is in a state where it can sandwich and feed the sheet document.

Note that the document presence/absence sensor 11 is a reflective sensor that detects the presence or absence of a sheet document. In addition, the tip detection sensor 1
2 is a reflective sensor that detects the leading edge of a sheet document.

Furthermore, the full-surface belt 15 is an endless belt with a width large enough to cover the entire surface of the sheet document, and the surface is made of a rubber-based material with a medium-thick friction coefficient so that the document can be conveyed by frictional force. Coated. Additionally, even if it gets dirty, it has been treated with alcohol, etc. to remove the dirt. This entire surface belt (15) is applied to a drive row 213 and a turn roller 19, and the turn roller 19 has a force applied to its shaft 19a to the left in FIG. The entire surface belt 15 is constructed so as not to cause slippage. Further presser rollers 16, 17, 18
are provided inside the full-surface belt 15, and include the feed roller 5, presser rollers 16, presser rollers 16 and 17, and presser rollers 17 and 18.
The distance between the presser roller 18 and the paper discharge roller 20 is set at a distance that is slightly smaller than the conveyable sheet original size. Each roller 16, 17, 18 presses the full-face bell) 15 against the original platen glass 47 with a weak pressure, and increases the conveying force when the sheet original 2 passes between the original platen glass 47 and the full-face bell) 15. There is.

Note that the discharge detection sensor 22 is a reflective sensor that detects discharge of a sheet document and turns on a jam lamp if no document passes for a certain period of time.

Further, the ejection roller 20 is pressed by the ejection roller 21, and then the sheet original, which has been copied on the original platen glass 47, is caught and ejected. In addition, discharge roller 2
1 follows the movement of the sheet original. The documents discharged by the discharge roller 2o are sequentially loaded onto the paper discharge tray 23. Note that the discharge roller 21 has a knurled shape to facilitate loading onto the paper discharge tray 23.

Now, referring to FIG. 2, an embodiment of the driving section of the present invention will be described.

The drive gear 42 is fixed to the rotating shaft 43a of the motor 43, and the drive of the motor is transmitted to the gear 40 via the idler gear 41. Here, the rotation of the gear 40 is transmitted to the clutch shaft 44 by ON-OFF' of the electromagnetic clutch 35, and when the electromagnetic clutch 35 is energized, it is turned ON. Further, the electromagnetic brake 34 moves to stop the rotation of the clutch shaft 44, and when the electromagnetic brake 34 is energized, the rotation of the clutch shaft 44 is stopped. The gear 36 is fixed to the clutch shaft 44 and rotates when the clutch shaft 44 rotates, transmitting rotation to the clock disc gear 37 to increase its speed and rotate the clock disc 38.

The clock disk 38 has fine grooves on its circumference, and the photointerrupter 39 reads the number of grooves and counts the number of clocks. The rotation of the clutch shaft 440 is transmitted to the drive roller shaft 14 by the drive pulley 33 fixed to the clutch shaft 44 and the belt 32 looped around the driven pulley 31 fixed to the drive roller shaft 14 . Further, the pulley (large) 25 is attached to the drive roller shaft 14 via a spring clutch (not shown), and the plunger 7 controls the spring clutch control ring 26 via the clutch pawl 28, thereby controlling the drive transmission. Turn ON/OFF.

Further, 23 small pulleys receive 250 rotations of a large pulley via a belt 24, and are connected to the feed roller shaft 10 via a one-way clutch (not shown).

Now, the circumferential speed of the full surface bell) 15 is set to be slightly faster than the circumferential speed of the feed roller 5.
A diameter ratio of 23 has been chosen. When the sheet document 2 is held by the full-surface belt 15 and reaches the same speed as the belt 15, the small pulley (23) and the feed roller shaft 10 are connected in one way so that the feed roller 25 follows the sheet document 2. There is. Note that the feed row 25 and the pickup roller 3 are gear-coupled so that they have the same rotational direction and the same circumferential speed. Further, the plunger 30 swings the paper feed roller shaft 7 via the lever 29, so that the pickup roller 3
perform up and down movements.

Next, the operation of the above configuration will be explained in order.

A sheet original 2 is placed on an entrance tray l, and the sheet original is inserted between a pickup roller 3 and a paper feed roller 4. Then, the document presence sensor 11 detects a sheet document, and after a certain period of time, the plunger 30 is energized, the pickup roller 3 descends, and the document is sandwiched between the pickup roller 3 and paper feed roller 4 (in the state where there is no sheet document The pickup roller 3 is lifted upward). At the same time, the motor 43 rotates, the clutch 35 is also energized, and the drive row 213 rotates. In this state, the plunger 27 is not energized and the spring clutch (not shown)
Therefore, the pulley 25 (large) is stationary and the sheet document is not conveyed. When the motor 43 rotates and a certain period of time elapses, the plunger 30 is energized, the clutch claw 28 is separated from the control knob 26, the rotation of the drive roller shaft 14 is transmitted to the feed roller shaft 10, and the feed roller etc. 5 and the cook-up roller 3 are rotated. . At this time, the sheet original 2 begins to be conveyed. Then, when the leading edge of the sheet original 2 passes between the feed roller 5 and the second paper feed roller 6, the leading edge of the sheet original 2 is detected by the leading edge detection sensor, and from this point on, the photo interrupter 39 is activated by the clock disc 38. Start counting the number of clocks. Next, the sheet original 2 enters between the full-surface belt 15 and the original platen glass 47, and when its leading edge comes below the presser roller 16, the conveying force of the full-face belt 15 increases, and the sheet original 2 moves around the full-surface belt 15. The feed roller follows the sheet original 2 at a speed that is the same as the speed of the sheet document 2 and faster than the circumferential speed of the feed roller 25.

When the trailing edge of the sheet original 2 is detected by the paper presence/absence sensor 22, the plunger 30 is energized and the pickup roller 3 moves upward. Further, when the trailing edge of the sheet document 2 is detected by the leading edge detection sensor 12, the power to the plunger 27 is cut off, and the rotation of the feed roller 5 and the pickup roller 3 is stopped. This is because the next sheet document will not be accepted.

Now, the motor 43 detects when the leading edge of the paper is detected by the leading edge detection sensor 12.
When the alarm is notified and the first incrementer 39 counts a certain number of clocks, the power is cut off, and at the same time, the clutch 35 is turned off, the brake 36 is energized, and the clutch shaft 44 is instantaneously stopped.

As a result, the rotation of the drive roller shaft 14 and the movement of the full-surface bell 15 are stopped instantaneously, and the sheet original 2 is stopped at a predetermined position on the original platen 47.

Note that the power to the brake 36 is cut off for a certain period of time. Immediately, a copy start signal is sent to the copying machine main body to start copying, and exposure of the copying machine main body starts.

Then, the motor 43 rotates in response to the main unit copy end signal.
When the clutch 35 is energized, the full-surface belt 15 starts to eject the sheet original 2, the original is held between the ejection roller 20 and the ejection roller 21, and the sheet original 2 is ejected onto the paper ejection tray 23.

Note that when the document presence/absence sensor 11 is sensing the next document, the discharge detection sensor 22 detects the leading edge of the sheet document 2, and then the plunger 27 is energized to feed the sheet document in the same manner.

The above describes the operation of the document passing through the first pass, but here, the document may stick to the belt due to electrostatic charge after the first copy, or it may be curled, etc. The operation of passing the second paper/waste that is caught between the document conveying belt and the document conveyance belt will be explained with reference to FIGS. 3 and 4.

FIG. 3 is a detailed cross-sectional view of the document discharge section, and FIG. 4 is a detailed cross-sectional view of the document feed section.

After copying is completed, if the document passes between the entire surface belt 15 and the upper ejection guide 55 due to the above-mentioned reasons, it will
It is detected by the document detection sensor "IJ-54" installed at a distance corresponding to one dead space, which is the same time as the time detected by the sensor 22 when the paper passes through the paper path 111).After detection, the plunger 27 is energized. When the belt breaks, the feed roller 5 and pickup roller 3 stop rotating, and the next document is not fed.Furthermore, after detection by the document detection sensor 54, the rotation of the belt stops when the document is between the entire surface of the belt 15 and the upper paper feeding guide 57. After passing through the 20th paper bus between the upper cover 〇 and the front surface bell 15 through the gap 58, it returns to the first paper bus and continues until it is ejected to the document ejection tray 23. At this time, the signal from the document detection sensor 54 indicates that the document is in the first position.
The optical system (not shown) does not operate during the 310 paper passes, so no copying is performed.

Now, if the original that has returned to the first paper path enters the second paper path again, a jam signal is immediately issued when the original is detected again by the original detection sensor 54, and the rotation of the belt is stopped.

The document detected the second time by the document detection sensor 54 has its trailing edge remaining in the first paper path.
The book can be easily taken out by hand by opening the device in the same manner as in the book mode.

As explained above, even if a document should be caught between the belt and the upper blade bar, the present invention can automatically eject the document without stopping the operation of the automatic document feeder. L. Even if the original is reeled in, the rotation of the belt must be stopped once the original has been reeled in, so that the document can be easily taken out.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of the original 1-6 automatic feed position according to the present invention, Fig. 2 is a cross-sectional view of the driving section of the drive section, and Fig. 3 is a detailed cross-sectional view of the paper ejection section. 1 and 4 are detailed cross-sectional views of the paper feed section. In the figure, 1... Entrance tray, 3... Pick up roller, 4... First paper feed roller, 5... Feed roller, 6... Second paper feed roller, 8... Pickup arm, 9...Paper feed arm, 11...Document detection sensor, 12...Tip detection sensor, ]3...Drive roller, 15...Full surface belt, ]6, 17, 18...
- Presser roller, 19... Turn roller, 20... Paper ejection roller, 24, 25... Pulley, 27... Plunger, 43... Motor, 47... Original platen glass, 54...・・Document detection sensor.

Claims (1)

[Claims] (1) An automatic document feeder that automatically feeds a document from a document feeder onto a document tray and automatically ejects the document after image formation has a detection means for detecting that the document has deviated from a predetermined conveyance path. An automatic document feeder characterized in that the conveyance means continues to be driven until the document is ejected by a detection signal from the detection means. (The automatic document feeder described in Section 11).