JPH0592844A - Sheet transport device - Google Patents

Abstract

PURPOSE:To provide a sheet transport device capable of processing jam securely and easily. CONSTITUTION:When a jam is detected by jam detecting sensors 16, 17, a green LED (1) in an applicable one of an opening guide plate 10, 11 emits light to indicate a subject part of jam processing. In case the opening guide plate 10, 11 which is not related with the jam processing is opened, a red LED (2) in the applicable opening guide plate 10, 11 emits light for alarming.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper conveying device applied to a copying machine, facsimile machine, printer, printing machine and the like.

[0002]

2. Description of the Related Art Conventionally, in a copying machine, as a position display means for a jammed paper, there is an indicator on the operation panel or inside the outer case (a position visible when the cover is opened) for roughly displaying the paper conveyance path. Jam processing was performed by opening and closing the guide plate of the paper transport path with reference to the display.

[0003]

However, in the conventional copying machine, since the correspondence between the display portion of the position display means and the actual positional relationship of each jam portion is unclear, the jammed paper is liable to be left behind. There was a problem that the guide plate unrelated to the jam disposal was forgotten to be opened and closed, and the jam was generated again.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper conveying device which can surely and easily carry out a jam treatment.

[0005]

[Means for Solving the Problems] The above objects are to provide a plurality of guide plates for guiding the conveyance of a sheet, a plurality of jam sensors for detecting a jam of a sheet in a sheet conveyance path, and detection of opening and closing of each of the guide plates. A plurality of opening / closing sensors, and a first light emitting unit that emits light in the vicinity of a guide plate where a jam occurs based on a detection output of the jam sensor when a jam occurs
It is achieved by means of.

Further, in the first means, when the guide plate different from the generation site is opened, the first light emitting means is provided in the vicinity of the guide plate based on the detection output of the opening / closing sensor for detecting the opening / closing of the guide plate. Is achieved by a second means comprising a second light emitting means emitting in a different color.

In the second means, instead of the second light emitting means, a third means provided with an alarm means for notifying an erroneous operation can be achieved.

Further, a plurality of paper sensors provided in the middle of the paper conveyance path for detecting passage of the paper, a timing generating means for generating a jam detection timing, and a paper output by the paper sensor and the timing generating means. It is also achieved by the fourth means, which comprises a detecting means for detecting the jam and an illuminating means for illuminating the sheet conveying path for each jam occurrence site according to the detection output of the detecting means.

The fourth means can also be achieved by the fifth means provided with an internal lighting means for illuminating the inside of the device when the cover body forming the exterior body of the device is opened.

[0010]

In the first and second means, when a jam occurs,
Based on the detection output of the jam sensor that detected the jam,
The first light emitting means emits light in the vicinity of the guide plate where the jam has occurred. Further, when the guide plate that is not effective for the jam treatment is opened, the second light emitting means emits another color based on the detection output of the opening / closing sensor that detects the opening / closing of the guide plate.

Further, in the third means, when a guide plate that is not effective for jamming is opened, an alarm means such as a buzzer operates to notify an erroneous operation.

In the fourth means, when a jam occurs, the detecting means detects the jam of the paper by the jam generating portion by the output signals of the paper sensor and the timing generating means, and the illuminating means detects the jam by the detected output. Illuminate the paper transport path according to the location of the jam.

Further, in the fifth means, when the cover body is opened, the internal lighting means illuminates the inside of the apparatus main body.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the essential parts of the first embodiment of the present invention, showing only the vicinity of the starting point of the paper feed path of the paper feed section. In the figure, reference numerals 1 and 2 are upper and lower two-stage sheet cassettes,
4 and 5 are pick-up rollers, 6 and 7 are separation / conveyance roller pairs,
Numerals 8 and 9 are fixed guide plates for guiding the conveyance of the paper fed from the paper cassette. Numerals 10 and 11 are openable and closable guide plates installed opposite the fixed guide plates 8 and 9, and 12 and 13 are opening and closing guides. Open detection sensors that detect the open states of the plates 10 and 11, 14 and 15 that are closed detection sensors that also detect the closed state respectively, and 16 and 17 are jam detection sensors that detect the jammed paper in the transport path, respectively. Reference numeral 19 denotes a green LED (1) which is a first light emitting means and a red L which is a second light emitting means provided on each of the opening and closing guide plates 10 and 11.
It is a light-emitting unit composed of ED (2). Although not shown, fixed guide plate-opening / closing guide plate pair, open detection sensor, close detection sensor, jam detection sensor, LED (1) -LED
(2) A total of n pairs are provided along the paper transport path.

FIG. 2 is a block diagram of the control system of the first embodiment. Reference numeral 20 denotes a plurality of (1 to n) open detection sensors (12, 13) via I / O ports 21, 22. , The close detection sensor (14, 15) and the jam detection sensor (16,
17), the LED (1), the LED (2), the main body door open / close detection unit 23, and the CPU (central processing unit) for exchanging signals with the operation panel 24 and the like.

3 to 6 show LEDs according to the state of the n jam detecting sensors and the opening / closing guide plate of the first embodiment.
It is a flow chart which shows drive control of (1) and LED (2).

With reference to FIGS. 3 and 4, the drive control will be described by taking a flow relating to the first jam detection sensor as a representative. It is effective to remove the jammed paper when the jam is detected by the jam sensor (eg 16) during the copying operation of the copier (Y in S1) and the operation of the copier is stopped (S1-1). Green LED on the open / close guide plate (10)
(1) is turned on (S1-2), and the fact that a jam has occurred is also displayed on the operation panel 24 (S1-3). In the state where the jammed paper remains (the jam detection sensor (16) is turned on), the green LED (1) (of the light emitting section 18) is lit and the occurrence of jam is displayed on the operation panel 24.
The first jam detection sensor (16) is turned off (S1
-4), if the first opening / closing guide plate (10) is closed (N in S1-5), check the open / closed state of the second opening / closing guide plate (for example, 11) (S1-6). ..

When the second opening / closing guide plate (11) is opened (Y in S1-6), the second opening / closing guide plate (1) is opened.
Turn on the red LED (2) of 1) (S1-7), 2
Notify that the opening / closing guide plate (11) is open. After that, when it is detected that the second opening / closing guide plate (11) is closed (N in S1-6), the red LED (2) of the second opening / closing guide plate (11) is turned off (S1).
-8). After repeating the same judgment and processing until the (n-1) th opening / closing guide plate is finished, if the nth opening / closing guide plate is open (Y in S1-9), the red color The LED (2) is turned on (S1-10), and if it is closed (N in S1-9), the LED (2) is turned off (S1-11). Next, after turning off the first green LED (1) (S1-12), when it is confirmed that the main body door opened for the jam treatment is closed (N of S1-13), the operation is performed. Turn off the jam display on the panel 24 (S1
-14).

FIGS. 5 and 6 are subroutines when the i (2.ltoreq.i <n) jam detection sensor and the nth jam detection sensor output an ON signal.
Since the operation is the same as the ON operation of the second jam detection sensor, description thereof will be omitted.

FIG. 7 is a block diagram of a control system according to the second embodiment of the present invention. In the first embodiment, a single LED 30 that operates in the same manner as the green LED (1) is provided in the light emitting portion. It has the same configuration except that it is provided with a buzzer 31 as an alarm means instead of the red LED (2).

8 to 11 show the LED 30 and the buzzer 31 depending on the state of the n jam detecting sensors and the opening / closing guide plate.
3 is a flow chart showing the drive control of the. As is apparent from the figure, the only difference from the first embodiment is that the buzzer 31 is always sounded (WSi-7) when it is detected that each opening / closing guide plate is open. There is no change in the behavior of.

FIG. 12 is a schematic diagram of a copying machine according to the third embodiment of the present invention, in which 40 is a drum-shaped photosensitive member and 41 is a photosensitive member.
Is a light beam optical path for exposing the photoconductor, 42 is a cleaning device, 43 is a developing device, 44 is a transfer drum, 45 is a fixing device, 46 is a conveyor belt for feeding the paper from the transfer drum 44 to the fixing device 45, and 47 is a paper discharge. Rollers, 48 are registration rollers, 49 is a relay roller, 50 and 51 are upper and lower two-stage sheet feeding cassettes, 52, 53 and 54 are lamps (illuminating means), and the first lamp 52 is a sheet feeding cassette 50 or 51. The second lamp 53 is installed near the transfer port of the photoconductor 40, and the third lamp 54 is installed near the transport belt 46 near the take-out port. Further, 55 to 59 are paper sensors for paper detection, which include a relay sensor 55, a pre-registration sensor 56, a pre-cleaning sensor 57, a conveyance path sensor 58, and a paper ejection sensor 5.
9 are installed. Signals from the above-mentioned sensors and switches and control signals to respective parts are received and transmitted by a CPU (not shown).

FIG. 13 is a timing chart showing the detection timing of each sheet sensor. The detection timing of each sensor will be described below. (1) The time a from the reference point (the time when the paper is fed from the paper feed cassette 50, 51 by a pick-up roller (not shown) operated by the paper feed signal) until the leading edge of the paper reaches the relay sensor 55 is the relay sensor 55 ON. If it is not in the timing of, it is detected as a jam. (2) If the time b from the reference point until the leading edge of the sheet reaches the pre-registration sensor 56 is not at the illustrated on-timing, it is detected as a jam. (3) If the time c from the reference point until the trailing edge of the sheet passes through the relay sensor 55 is at the illustrated on-timing, it is detected as a jam. (4) If the time d from the reference point until the front edge of the sheet reaches the pre-cleaning sensor 57 is not on timing, it is detected as a jam. (5) If the time e during which the trailing edge of the paper leaves the pre-registration sensor 56 from the reference point is at the on-timing shown in the figure, it is detected as a jam. (6) The sensor 57 is located at the rear end of the paper from the reference point before cleaning.
If the time f for exiting is at the illustrated on-timing, it is detected as a jam. (7) If the time g for the leading edge of the sheet to reach the transport path sensor 58 from the reference point is not at the illustrated on-timing, it is detected as a jam. (8) If the time h for the leading edge of the sheet to reach the sheet ejection sensor 59 from the reference point is not at the on-timing shown in the figure, it is detected as a jam. (9) If the time i for the trailing edge of the sheet to pass through the transport path sensor 58 from the reference point is at the illustrated on-timing, it is detected as a jam. (10) If the time j for the trailing edge of the sheet to pass through the sheet ejection sensor 59 from the reference point is at the illustrated on-timing, it is detected as a jam.

FIG. 14 shows the first to third lamps 52, 5
It is a block diagram of the lighting / lighting-out control system of 3,54.
0 is a timing generator which is a timing generating means for generating a jam detection timing, 61 to 65 are inverters,
66-75 are AND circuits which take the logical product of the signal from the timing generator 60 and the output signal from each sensor and output it. 76-78 are the logical sum of the output signals of the AND circuits 66-75 as input signals. This is an OR circuit that takes and outputs. From the OR circuit 76, the above (1), (2),
The jam detection output signal as described in (3) and (5) is output, the jam detection output signal as described in (4) and (6) above is output from the OR circuit 77, and the OR circuit is also provided. The jam detection output signals as described in (7) to (10) above are output from 78, and the first lamp 52 and the second lamp 53 are output based on the respective jam detection output signals.
The third lamp 54 is driven to light.

In the present embodiment, the place where the remaining paper of the jam is actually illuminated by the illumination means such as the red incandescent lamp, the fluorescent lamp, the LED, etc. in the machine, the operator can check the transport path reliably and easily. , It does not cause any problems such as the removal of jam paper.

FIG. 15 is a wiring diagram showing the electrical connection of the internal illumination lamp of the main body, where 80 is the main power switch and 81
Is a power supply device, 82 is a switch provided in a part of a cover body provided in the main body of the apparatus, 83 is an illumination lamp which is an internal illumination means of the main body, and the switch 82 is closed and energized when the cover body is opened. , 84 are power circuits of the main body of the copying machine.
As is clear from this wiring diagram, when the cover body is opened for jam treatment, replenishment of consumables, etc., the illumination lamp 83 is turned on and the inside of the main body is illuminated, which facilitates the work.

[0027]

As described above, according to the first aspect of the present invention, the first light emitting means emits light in the vicinity of the guide plate where the jam occurs, so that the jam treatment can be performed reliably and easily. According to the second or third aspect of the present invention, when the guide plate unrelated to the jam treatment is opened, the second light emitting means emits light in a color different from that of the first light emitting means, or an alarm is issued. It is possible to prevent jamming due to forgetting to close the plate. Further, according to the invention described in claim 4, since the illuminating means illuminates the sheet conveying path for each jam occurrence portion when a jam occurs, the jam processing target portion becomes clear and the jam processing becomes easy. Further, according to the fifth aspect of the invention, when the cover body of the apparatus body is opened, the inside of the apparatus body is illuminated by the internal lighting means, which facilitates the jam processing work.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part in a first embodiment of a paper carrying device of the present invention.

FIG. 2 is a block diagram of a control system of the first embodiment.

FIG. 3 is a flow chart of drive control operation of the LED (1) and the LED (2) of the first embodiment.

FIG. 4 is a flow chart that follows the flow chart of FIG. 3;

5 is a flow chart that follows the flow chart of FIG.

FIG. 6 is a flow chart that follows the flow chart of FIG. 5;

FIG. 7 is a block diagram of a control system according to a second embodiment of the present invention.

FIG. 8 is a flow chart of drive control of the LED and the buzzer of the second embodiment.

9 is a flow chart following the flow chart in FIG. 8;

FIG. 10 is a flow chart that follows the flow chart of FIG. 9;

11 is a flow chart that follows the flow chart of FIG.

FIG. 12 is a schematic configuration diagram of a third embodiment of the present invention.

FIG. 13 is a timing chart showing the detection timing of each sheet sensor.

FIG. 14 is a block diagram of a lighting / extinguishing control system for the first to third lamps.

FIG. 15 is a wiring diagram showing the electrical connection of the internal illumination lamp of the main body.

[Explanation of symbols]

 10, 11 Opening / closing guide plate 12, 13 Open detection sensor 16, 17 Jam detection sensor 18, 19 Light emitting part (first light emitting means, second light emitting means) 31 Buzzer (alarm means) 52-54 Lamp (illuminating means) 55- 59 paper sensor 60 timing generator 83 illumination lamp (internal illumination means)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kenichi Hamano 1-3-6 Nakamagome, Ota-ku, Tokyo In stock company Ricoh Co., Ltd. (72) Takuro Kamiya 1-3-6 Nakamagome, Ota-ku, Tokyo Share In Ricoh Company (72) Inventor Kiyoshi Fukushima 1-3-6 Nakamagome, Ota-ku, Tokyo Stock Company Ricoh (72) Inventor Masahiro Kitayama 1-3-6 Nakamagome, Ota-ku, Tokyo Stock Company Ricoh ( 72) Inventor Toshiya Yabei 1-3-6 Nakamagome, Ota-ku, Tokyo Within Ricoh Co., Ltd.

Claims (5)

[Claims] 1. A plurality of guide plates for guiding conveyance of a sheet, a plurality of jam sensors for detecting a jam of a sheet in a sheet conveying path, a plurality of open / close sensors for detecting opening / closing of each of the guide plates, and a jam occurrence. A paper conveying device equipped with a first light emitting means which sometimes emits light in the vicinity of a guide plate where a jam occurs based on the detection output of the jam sensor. 2. The first light emission according to claim 1, wherein when a guide plate different from a generation site is opened, the first light emission is performed in the vicinity of the guide plate based on a detection output of an opening / closing sensor that detects opening / closing of the guide plate. A paper conveying device including a second light emitting unit that emits light in a color different from that of the unit. 3. The paper conveying device according to claim 2, further comprising an alarm means for notifying an erroneous operation in place of the second light emitting means. 4. A plurality of paper sensors provided in the middle of the paper conveyance path for detecting passage of paper, a timing generation means for generating a jam detection timing, and a signal output from the paper sensor and the timing generation means. A paper conveyance device comprising: a detection unit that detects a jam of a sheet for each jam generation site; and an illumination unit that illuminates a paper conveyance path for each jam generation site according to the detection output of the detection unit. 5. The paper conveying apparatus according to claim 4, further comprising an internal lighting unit that illuminates the inside of the apparatus when the cover body forming the exterior body of the apparatus is opened.