JPS5882929A - Paper feeding - Google Patents

Abstract

PURPOSE:To surely carry out the feeding of a first paper when papers in a tray are successively fed, by setting the maximum draw-in time of the first paper longer than that of the consecutive papers. CONSTITUTION:A sequencer 21 disposed in a facsimile device receives an operation starting signal 23 from a control board 22 and a detecting signal 24 from a sensor 26, and delivers a starting signal 25 as a measurement starting signal to a 5sec timer 26 and a 2sec timer 27. The sequencer 21 is also provided with a counter for counting the starting signal, and therefore, delivers a first sheet signal 28 at the stage in which the first starting signal is issued, to the 5sec timer 26. Then, the consecutive sheet signals are delivered at the stage in which the consecutive sheet starting signals are issued, to the 2sec timer 27. The output signals 31, 32 from both timers 26, 27 are delivered to a two-input type AND- circuit 34 through an OR-circuit 33.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding method for feeding sheets stacked on a tray one by one to predetermined locations in an apparatus.

2. Description of the Related Art Many reading devices or recording devices such as facsimile machines and copying machines employ a paper feeding method in which a document or recording paper is automatically fed to a predetermined location within the device.

6fr 1 Figure shows a facsimile machine equipped with a function to automatically feed originals. ft feed roller 13 and trigger roller 14 are provided. The feed roller 13 is in contact with the bottom layer of the document 12 through an opening provided in the bottom plate of the document supply tray 11, and by its rotation, the feed roller 13 passes the bottom document t) to the IJ roller 14. The roller 14 is the document supply tray 1
1 and is driven by a drive motor 15 together with a feed roller 13 . trigger roller 14
A retard roller 16 is disposed above and facing the retard roller 16 to completely prevent double feeding of the documents 12. A.D.F.I.
The document sent out from the platen 3 is conveyed along a path indicated by a dotted line 2 and passes over the upper surface of the platen 3. A lamp 4 for illuminating the original and a reading optical system (not shown) are arranged below the platen 3, and image information is read by light reflected from the original. The document that has passed through the platen 3 is further conveyed along the path indicated by the dotted line 2, and then transferred to the catch tray 5.
Used in conjunction with above.

Incidentally, in such a facsimile, a sensor 6 for detecting a document is arranged in a path of the document at a predetermined distance from the document supply tray 11. The control circuit (not shown) is
Each time the ADF1 starts driving, time is measured and the feeding status of the originals sent out one after another from the original supply tray 11 is monitored. and for a certain period of time (e.g. 2
If the sensor 6 does not detect the original within 1 second), it is assumed that the feeding of the original has failed, and necessary measures such as stopping the operation of the apparatus are taken.

However, with a facsimile like this that is fully equipped with an ADF,
There were many cases where feeding of the first document after setting the document on the document supply tray failed. In particular, as shown in Figure 2,
If the originals 12 are set on the original supply tray 11 with their front edges neatly aligned, there is a high probability of failure in feeding.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a paper feeding method that can effectively feed the first sheet of paper stacked on a tray.

In the present invention, there are two types of time (long and short) during which paper can be fed and unloaded (hereinafter referred to as the maximum pull-in time), and for the first sheet of paper, the longer time is set to the maximum length. For the second and subsequent sheets, the shorter time f, #tL is used as the dog retraction time to achieve the above purpose. FIG. 3, which describes the present invention in detail, shows the main parts of a facsimile machine for realizing the paper feeding method of this embodiment. A sequencer 21 provided in the facsimile receives an operation start signal 23 from the operation panel 22 and a detection signal 24 from the mind sensor 6, respectively.

The sequencer 21 includes a time counter (not shown) that counts clock signals. By pressing the start button on the operation panel 22, an operation start signal 23 is sent to the sequencer 21.
is input, the start signal 25 is input at a predetermined period.
is output. Start signal 25 is 5 second timer 26 and 2
The signal is input to each of the second timers 27 as a signal for starting measurement.

The sequencer 21 also includes a counter that counts the start signals 25, and outputs the first signal 28 when the first start signal is output, and outputs the second signal 28 when the second and subsequent start signals are output. Thereafter, a signal 29 is output.

The first sheet signal 28 is supplied to the 5 second timer 26 and enabled. 2 second timer 27 for signal 29 after 2nd picture
is supplied and enabled. 5 second timer 26
and the respective output signals 31 and 32 of the 2 second timer 27 are 1
After passing through the seven circuit 33, the signal is supplied to one input terminal of the two-person group circuit 34.

Furthermore, the sequencer 21 includes a flip-flop circuit which is set by the detection signal 24.

The document passage signal 35 outputted from the negative logic output terminal is supplied to the other input terminal of the AND circuit 34. The output signal 36 of the AND circuit 34 is supplied to the motor drive circuit 37, and when this signal 36 is at H()h i) level, the motor drive circuit 37
A drive signal 38 is supplied from the drive motor 15 to the drive motor 15 .

FIG. 4 is for explaining the feeding method of the document 12 in this facsimile. The operator of the device uses the operation panel 22
When the upper start button is pressed, the sequencer 21 outputs the first start signal 25. (Figure 4a) is generated. At this time, since the first sheet signal 28 is being supplied to the 5 second timer 26, the timer 26 generates an H level output signal 31 (FIG. 4b) for 5 seconds. At this stage, the document passage signal 35 is at H level, and the AND circuit 34
An output signal 36 (FIG. 4C) of H level is outputted from. As a result, driving of the drive motor 15 is started.

When the drive motor 15 is driven, the feed roller 13 and the tril roller 14 rotate.dIf the front edge of the document 12 is aligned as shown in FIG. The whole thing is moving forward little by little,
At the stage where their front ends are pressed against the circumferential surface of the retard roller 16 and shifted in a stepwise manner, the lowermost original document is wedged between the trigger roller 14 and the retard roller 16. As a result, the first document is sent out.

When the first document advances along the path shown by the dotted line 2 and passes through a pair of registration rollers 41 and 42, it is detected by the sensor 6 within 5 seconds from the start of ADFI drive, and the detection signal is output. 24 (FIG. 4d), the output signal 36 is stopped. The subsequent conveyance of the document is performed by registration rollers 41 and 42. On the contrary,
If the sensor 6 does not detect the document within 5 seconds from the start of driving the ADFl, the drive motor 15
stops. At this time, the control circuit performs necessary operations such as displaying the paper jam. When the first original is fed to the paperback, a second start signal 252 is generated. This causes the 92 second timer 7 to set to 2.
An output signal 32 (FIG. 4e) of H level is generated for a period of seconds. At the same time, an H level output signal 36 (FIG. 4C) is output from the AND circuit 34, and driving of the drive motor 15 is started. At this point, the front edges of the documents in the document supply tray are staggered in a stepped manner. Therefore, the document is immediately fed out by the feed roller 14 in the normal case. Sensor 6 detects this within 2 seconds,
When the detection signal 24 is output, the output signal 36 is stopped at this point, and the same applies to the 033rd and subsequent documents for which the driving of the drive motor 15 is stopped. If the sensor 6 does not detect a document within 2 seconds, the operation will be as described above.

As explained above, according to the present invention, when the sheets stored in the tray are continuously fed out, the maximum retraction time is set longer for the first sheet than for the second and subsequent sheets. Changes can improve the reliability of the paper feed mechanism.

Note that, for example, in the case of a facsimile, various control signals are transmitted before the image signal is transmitted. Therefore, if these times are allocated to the paper feeding time, ゛1
The increase in the maximum pull-in time for the second sheet does not actually cause any problems.

Moreover, the maximum pull-in time for the second and subsequent cards can be set to be as short as or even shorter than before, so there is no risk of the time required to complete the operation of the device becoming longer, and, for example, the line usage There will be no increase in fees.

Further, in the embodiment, the ADF has been described, but the present invention is not limited to this. Furthermore, it goes without saying that the present invention can be similarly applied to an upper feed type paper feeding mechanism that feeds paper from above.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a facsimile equipped with an ADF, FIG. 2 is a side view showing an example of how documents are stored in the document supply tray, and FIG. FIG. 4 is a waveform diagram for explaining the operation of the circuit portion shown in FIG. 3. 11... Original supply tray 12... Original 15... Drive motor 21... Sequencer 26... Five minute timer 27... ...Two-minute timer applicant Fuji Xerox Co., Ltd. Representative patent attorney Yu Ume Yamauchi

Claims (1)

[Claims] In a paper feeding device that feeds multiple sheets of paper stacked on a tray one by one to both predetermined locations of the device, the length of time that the entire paper feeding operation can be performed is set, For the first sheet of paper to be fed out, the paper feeding operation is performed within the longer time period,
A paper feeding method characterized in that for the second and subsequent sheets of paper that are continuously fed thereafter, the paper feeding operation is performed within the shorter time period.