JPS5937501B2 - Paper feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement of a paper feeding device, specifically, a paper feeding device for feeding sheets of paper such as copy paper, copy manuscript, printing paper, etc. one by one using a paper feeding roller and a separation roller. Regarding.

Conventionally, a paper feeding device using a paper feeding roller and a separation roller has been used, and as schematically shown in FIG. The feed roller a is driven in the direction of arrow A, and the separation roller is driven in the direction of arrow B via a slip clutch c.

The friction force between the paper feed roller a and the separation roller is greater than the friction force of the clutch plate of the slip clutch c, and the friction force between the separation roller and the paper d is greater than the friction force between the paper feed roller a and the paper d.
This is set to be smaller than the frictional force between the paper d and the frictional force of the clutch plate of the slip clutch c. Therefore, when the paper feed roller a is stopped, the separation roller is also stopped,
Slip clutch c is slipping. and paper feed roller a
When the paper feed roller a and the separation roller are driven, the friction force between the paper feed roller a and the separation roller is greater than the friction force of the clutch plate of the slip clutch c, so the paper feed roller a and the separation roller rotate in the normal direction, and both rollers a and b Paper d is inserted between them, and the separation roller comes into contact with paper d, and the frictional force between the separation roller and paper d is smaller than the frictional force of the clutch plate of slip clutch c, so that slip clutch c Since it no longer slips, the separating roller rotates in the direction of arrow C to perform a separating action, and only the lowest sheet of paper is sent out in the direction of arrow D by paper feed roller a. However, such conventional paper feeding devices tend to cause so-called double feeding, in which two or more sheets of paper are sent out at the same time, and this double feeding increases as the paper feeding speed increases, and is an obstacle to increasing the speed of the paper feeding device. It was becoming.

As a solution to the above problem, JP-A-51-1511
37, which is very effective because it can automatically copy a large number of originals, but 1.
, When making a small number of copies of two sheets, the time required to set the originals on the automatic document feed tray becomes large compared to the overall copying process, so it is necessary to manually place the originals on the document loading tray (
platen) and make copies.
In this case, the document transport belt on the platen functions as a normal platen cover and does not eject the document even after copying has been completed, resulting in problems such as misplacing the document and troublesome handling (setting and removing). It was hot. The present invention has been made in consideration of the above-mentioned problems, and is a paper feeding device that has the function of automatically feeding, copying, and ejecting a large number of originals. The object of the present invention is to provide a paper feeding device that always ejects the original document after completion of copying, thereby preventing the original from being left behind and shortening the copying process.

The present invention will be explained below based on FIGS. 2 to 4.

2 and 3 show an example in which the present invention is applied to an automatic document feeder of a copying machine, and FIG. 4 shows its control circuit.

Documents 1 are stacked in a tray 2, and the lowest document 1 is sent out by a paper feed roller 3 and a separation roller 4, and is set on a platen 7 by a document conveyance belt 6 via a pinch roller 5 and copied. Ru.

The original 1 that has been copied is discharged by the original transport belt 6. The document conveying belt 6 rotates in one direction together with the cover 6a, so that it can be opened and closed relative to the platen 7.

A drive system for the paper feed roller 3, original conveyance belt 6, and pinch roller 5 is constructed as shown in FIG.

That is, the rotational force of the motor M is transmitted to the driving shaft 10 via the high-speed clutch 8 and the epicycle gear 9,
A drive belt 11 and a drive chain 12, which are wound around a pulley provided on the drive shaft 10, drive a paper feed roller 3, a separation roller 4, a document conveyance belt 6, and a pinch roller 5. It's summery. In addition, 13
14 is a paper feeding clutch, and 14 is a slip clutch. The operation of the paper feeding device configured as described above will be explained using the control circuit shown in FIG. 4.

First, raise the document conveying belt 6 as shown by the chain line in FIG.
We will explain the operation when downloading and making a copy.

In this case, since the document is not in tray 2, the micro switch MSl in FIG. 4 is open, so the relay RL is open.
l does not work.

When a start signal is input by the operator pressing the start button in this state, contact S1-1 of relay RLl opens and contact S1-2 closes. Therefore, a copy start signal is issued and copying begins. When the number of copies reaches a predetermined number and scanning of the final copy is completed, a paper feed start signal is input. Then, relay RL6 is activated and motor M is driven. At this time, relay RLl does not operate, so contact S1
-5 is open and relay RL3 is not activated. Also DC24V
On the line , the coil L2 enters from the contact S4-1 and the contact S3-2 line, the high-speed clutch 8 is connected, and the document conveyance belt 6 begins to feed out the copied document at high speed. At this time, contact S6-1 is closed, contact S1-
Since timer T2 is closed, timer T2 starts at the same time and times out after the set time (2 seconds in this embodiment). Now contact St2-1 opens and relay RL
6 is broken. On the other hand, at this time, contact St2-2 is also closed, but since relay RLl is disconnected and contact S1-6 is open, no copy start signal is output. This completes the document ejection operation. Next, use in automatic document feed mode will be explained.

When a document is set in tray 2, the micro switch MS1
is activated, which turns on relay RLl, which closes contact S1-5 and puts relay RL3 into the activated state. When a start signal is sent in this state, contact S1-2 is opened, contact S1-1 is closed, and relay RL6 is activated to maintain its self-holding state. Motor M now rotates. At the same time, contact S6-1
When the timer T1 closes, the timer T1 starts. At this time, since RL3 is operating, the contact S3-2 on the DC24 line is open and the coil L2 is not excited, while the contact S4-1 is normally closed, and the contact S1-7 is in the micro It is closed by the operation of switch NSL, and coil L1 is energized. Therefore, the paper feed clutch 13 is connected by the excitation of the coil L1, and the high speed clutch 8 is disconnected by the deenergization of the coil L2, and the paper feed roller 3 is rotated at a low speed by the shifted transmission of the epicycle gear 9. As a result, the lowest document 1 on the tray 2 is sent out at a low speed (8 m71 L/SeC in the embodiment). Next, as the time T1 increases, the contact St-1 opens, so the relay RL3 becomes inactive and the contact S3-2 closes, thereby energizing the coil L2 and connecting the high-speed clutch 8.

Therefore, the paper feed roller 3 rotates at high speed by the outer shell transmission of the epicycle gear 9, and the document 1, which was being sent out at a low speed, is sent out at a high speed (340 ml/Sec in the embodiment). The sent document 1 is first passed through the micro switch MS2.
, then activates micro switch MS3 and relay RL
4 self-holds and the normal side of the contact S4-1 opens, thereby demagnetizing the coil L1 and stopping the drive of the paper feed roller 3. However, the coil L2 continues to be excited by the micro switch MS2. Therefore, subsequent documents 1 are transported by the pinch roller 5 and the conveyor belt 6, which are driven via the high-speed clutch 8. When the rear end of the document 1 passes the micro switch MS2, the micro switch MS2 is turned off, the coil L2 is demagnetized, the high speed clutch 8 is cut off, and the conveying belt 6 is driven at low speed by the shaft transmission of the epicycle gear 9. Ru.

Subsequently, as the trailing edge of the document 1 passes, MS3 is also turned off, and since S4-2 is closed, relay RL is activated, which connects contact S5-1 and causes timer T2 (set time 2 seconds) starts. While the timer T2 is operating, the original 1 is aligned on the platen 7 at a low speed by the conveyor belt 6. At the same time, the coil L is energized by the connection of the contact S5-2, and the paper feed roller 3 is rotated at a low speed by the connection of the paper feed clutch 13, and the next document is sent out at a low speed.
Then, when the timer T2 times up, the self-holding state of the relay RL6 is released, and the motor M is stopped.

As a result, the original 1 on the platen 7 is stopped at the copy position, and the next original 1 is stopped after being slightly fed out by the paper feed roller 3. Note that due to time-up of timer T2, contact St2-2 closes, and at this time, relay R
Ll is excited, contact S1-4 is closed, and St2-
1 opens, relay RL6 becomes inoperable, and contacts S5-,
is closed, the input to timer T2 is cut off, but timer T
An off delay (not shown) is provided at the contacts St2-1 and st2-2, and the copy signal is sent during the delay time.

At the same time, a copying signal is sent, and during copying, relay RL is activated and relay RL3 remains inactive. Next, when the paper feeding start signal is sent again, the relay RL
6 holds itself, and motor M rotates.

At this time, relay RL3 is inactive, so contact S
The coil L2 is energized by the connection of 3-2 and the normal side of the contact S4-1, and with the high-speed clutch 8 connected, the coil L1 is also energized and the sheet feeding clutch 13 is connected. As a result, the next document 1, which had been slightly fed out by the low-speed feed of the paper feed roller 3, is fed out at high speed. At the same time, the first original 1 that has been copied is discharged from the platen 7 by the conveying belt 6. The next document 1 is the same as the document 1 ejected from the platen 7.
2. It is fed while operating MS3, and then the paper feed tray 2
The original above is sent out in the same way. When the last document is fed in this way, the micro switch MS is turned off while the document is being transported and fed, but the relay RLl continues to open contacts S1-4 due to its self-retention until the feeding of the last document is completed. Contacts S1-6 and S1-7 are kept closed to continue normal operation.

Further, ejection of the last original after copying is performed in exactly the same manner as when the original is manually set on the platen 7 since the micro switch MSl has already been turned off. As is clear from the above description, the present invention ensures that the original is ejected after copying is completed, regardless of whether the original is set in the automatic document feed mode or manually, and is highly effective in preventing misplaced originals and shortening the copying process. be.

[Brief explanation of drawings]

FIG. 1 is a perspective view schematically showing a paper feeding device, FIG. 2 is a side view showing an example of the present invention, FIG. 3 is a perspective view of the drive system of the present invention, and FIG. 4 is a drive control of the present invention. It is a diagram showing a circuit. 2 is a tray, 6 is a document carrying belt, and 7 is a platen.

Claims (1)

[Claims] 1 A microswitch MS_1 detects a large number of originals on the tray 2, sends them one by one between the platen 7 and the original conveying belt 6 in contact with the platen, and automatically ejects the originals after copying is completed. In the paper feeding device according to the present invention, there is a motor drive device that drives the motor M when there is no document on the tray 2 and the microswitch MS_1 for detecting the presence or absence of the document is open and when copying is completed; A paper feeding device comprising a clutch device that connects a motor M and a driving shaft 10 that drives a document conveyance belt 6, and a timer device that sets the operating time of the clutch device and the motor M.