JPH0818704A - Sheet transport device that can be opened and closed - Google Patents

Abstract

(57) [Summary] [Purpose] Detecting the opening and closing of the document guide plate at low cost and preventing malfunctions / operations when opening. [Structure] The document presence / absence sensors 51, 52 and the document edge detection sensors 53, 54 are also used as guide plate opening / closing detection sensors.
When the document guide is released, the actuator 5 is arranged so that the document sensor 52 and the document edge sensor 54 are in a constant detection state.
1 and 53 are arranged, release is determined based on the detection state, and the sheet feeding operation is controlled accordingly. When the document guide is released, the actuators 51 and 53 are arranged so that the detection states of the document sensor 52 and the document edge sensor 54 shift and change, and the release is determined according to the timing of the detection state and the change of the detection state, and the feeding is performed accordingly. Controls paper operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an openable / closable sheet conveying device, and more particularly, to a sheet feeding device such as a facsimile, a copying machine, a printer or a scanner.

[0002]

2. Description of the Related Art FIGS. 18 and 19 show a conventional example.

Conventionally, the sheet sensor detects whether or not the sheet is set, and the sheet edge sensor only detects the leading edge and the trailing edge of the sheet. The control is shown in Figure 1.
It was 8, and the detection of fixing / releasing the sheet guide was not performed. Alternatively, even if it is done, the sensor 55 dedicated to the sheet guide is used to detect the fixation / release of the sheet guide as shown in FIG.

[0004]

However, the above-mentioned conventional example has the following drawbacks.

If the sheet guide is released when the sheet is not set, the sheet actuator moves to the same position as when the sheet is set, and the sheet sensor erroneously detects that the sheet is set, and the sheet is set. The pre-conveyance roller, separation conveyance roller, feeding roller, and paper ejection roller rotated during the operation. At this time, since the pressing force of each roller is also released, the load on the drive system is reduced and noise is generated.

Further, when the sheet guide is released, it is erroneously detected that the sheet is set. Therefore, there is a possibility that the normal operation can be performed and the erroneous operation may be performed while the sheet guide is released.

Further, when the sheet guide is released during the operation, the operation does not stop, the above-mentioned noise is generated, or the sheet is not conveyed even during the operation, which may cause a malfunction. .

In the case where a dedicated sensor is used, a sensor is required, the cost of parts is increased, the number of assembling steps is increased, and the cost is increased.

[0009]

According to the present invention, the sheet sensor and the sheet edge sensor are also used as a sensor for detecting the opening / closing of the sheet guide so that the opening / closing can be accurately detected at low cost. .

According to the present invention, specifically, the sheet actuator and the sheet edge actuator are arranged so that the detection states of the sheet sensor and the sheet edge sensor are constant when the sheet guide is released, and the sheet edge is released when the sheet guide is released. By determining whether the sheet guide is released or not depending on the sensor detection state and the sheet sensor detection state, it is possible to detect the release of the sheet guide without a specialized sensor before the paper feeding operation. The paper feeding operation is controlled according to the detection.

On the other hand, the seat actuator and the seat edge actuator are arranged so that the detection states of the seat sensor and the seat edge sensor are changed at the timings when the detection states of the seat sensor and the seat edge sensor are deviated in accordance with the changes in the fixing and releasing of the seat guide. By determining whether the sheet guide is released or not depending on the detection state of the edge sensor and the timing of change in the detection state, it is possible to detect the release of the sheet guide without the need for a special sensor before the paper feeding operation. The paper feeding operation is controlled according to the detection.

[0012]

【Example】

(Embodiment 1) First, with reference to FIGS. 1 and 2, an outline of an entire facsimile apparatus using a paper feeding apparatus constructed according to the present invention will be described.

In FIGS. 1 and 2, 1 is a main body of the apparatus, 2 is an original placing table configured so that a plurality of original sheets S can be stacked on a top cover of the main body 1, and 3 is an original S.
An image reading unit for reading image information of 4, a recording unit including a laser beam printer, a document conveying unit 5, a document pressing unit 6, a contact image sensor 7, a document discharge tray 8, a laser scanner 9, 10 is an image forming unit, 11 is a cassette paper feeding unit, 12 is a recording paper discharge tray, and 13 is an MP.
(Multi-recording paper) cassette, 14 opening / closing lid, 15 AD
F cover, 16 is an upper document guide, 17 is a weight shaft, 18
Is a document holding plate, 19 is a lower document guide, 50 is a guide lock, 51 is a document actuator, 52 is a document sensor, 5
3 is a current edge actuator, 54 is a document edge sensor, 20 is a partition between an image reading unit and a recording unit, 21 is a control unit of a facsimile machine, 22 is a handset, 23 is a conveyance guide, 24 is an operation unit, and 25 is a display unit. , 26 is a tally lamp showing the operation state of the facsimile apparatus, 28 is a light cover, 29 is an MP cassette sensor, and 30 is an MP separation unit.

The image reading section 3 conveys the document S loaded on the document placing table 2 by the pre-conveying roller 5b and the pre-conveying pressing piece 5a which is in pressure contact with the pre-conveying roller 5b.
Separate one by one. Further, the paper feed roller 5f and the pressing spring 5
While being fed to the contact-type image sensor 7 by the paper feed roller 5e or the like pressed by k, the document pressing unit 6 presses the document S against the contact-type image sensor 7 by the weight shaft 17 and the document pressing plate 18 to bring the document S into close contact. The image information of the document S is read. Then, the document S is output to the document discharge tray 8 by the discharge roller 5h and the discharge roller 5g pressed by the pressing spring 5k. During this time, the original S is placed on the upper original guide 1
6 and the lower document guide 19. Guides by the upper document guide 16 and the lower document guide 19 are fixed and released by a guide lock 50. The guide lock 50 includes a guide lock claw 50a and a guide lock spring 50b. The guide lock claw 50a is a guide lock spring 50.
The boss of the upper document guide 16 is fixed by the spring force of b.

A slider 2a is slidable on the document table 2 in a direction perpendicular to the conveying direction of the document S (width direction of the document S).
Is provided so that both sides of the original document S stacked on the original document table 2 can be aligned by the slider 2a. If the original S is a long original, the extension original tray 2b can be opened to prevent the rear end of the original S from protruding from the original table 2 and hanging down.

A first embodiment of the present invention will be described with reference to FIGS.

First, the operations of the document actuator 51, the document sensor 52, the document edge actuator 53, and the document edge sensor 54 during the paper feeding operation will be described with reference to FIGS.

The document sensor 52 and the document edge sensor 54 are photo sensors.

As shown in FIG. 3A, the original document actuator 51 blocks the original document sensor 52 without the original document S. FIG.
When the document S is set as shown in FIG.
Since the document a is pushed up, the document actuator 51 does not block the document sensor 52. The document S is detected by the change from the blocked state to the unblocked state. The left-handed rotation of the actuators 51 and 53 is restrained so as to stop at the position shown in FIG.

As shown in FIG. 4A, when the leading edge of the document S is not transported to the document edge actuator 53 even when the document S is transported, the document edge actuator 53 blocks the document edge sensor 54. As shown in FIG. 4B, when the document S is conveyed and the leading edge of the document S passes through the document edge actuator 53, the lever 53a is pushed up and the document edge actuator 53 causes the document edge sensor 54 to move.
Do not block. The change from the blocking state to the non-blocking state detects the leading edge of the document S. As shown in FIG. 4C, when the document S is further conveyed and the trailing edge of the document S passes the document edge actuator 53, the document edge actuator 53 moves to the original position and the document edge actuator 53 causes the document edge sensor 54 to move. Block off. The rear end of the document S is detected by the change from the non-blocking state to the blocking state. The levers 51a and 53a also serve as weights for turning the actuators 51 and 53 in accordance with the inclination angle thereof.

Next, as a feature of the present invention, the document actuator 51, the document sensor 52, the document edge actuator 53, and the document edge sensor 54 when the upper document guide 16 is released when the paper feeding operation is not performed. The operation will be described.

As shown in FIG. 3A, when the upper document guide 16 is fixed when there is no document S, the document actuator 51 is blocking the document sensor 52 and the document edge actuator 53 is the document edge sensor 54. Is blocking. When the upper document guide 16 starts to be released as shown in FIG. 5A, the document actuator 51 keeps blocking the document sensor 52 and the document edge actuator 53 does not block the document edge sensor 54.

As shown in FIG. 3B, when the upper document guide 16 is fixed when the document S is set,
The document actuator 51 does not block the document sensor 52, and the document edge actuator 53 blocks the document edge sensor 54. When the upper document guide 16 starts to be released as shown in FIG. 5B, the document edge actuator 5
3 does not block the document edge sensor 54 by turning right under its own weight. Further, the document actuator 51 blocks the document sensor 52.

According to the present invention, before the sheet feeding operation, in the case of FIGS. 5A and 5B, the manuscript sensor 52 is set to the manuscript actuator 5.
When the document edge actuator 53 is blocked by 1 and the document edge sensor 54 does not block the document edge sensor 54, it is determined that the upper document guide is released.

FIG. 6 shows an example of control according to the present invention.

In the standby state, when the document edge sensor 54 has a document (the document edge sensor is not blocked), it is determined that the upper document guide 16 is released, and error processing is performed (S0). When the document S is set (the document sensor 52 is not blocked), the state of the document edge sensor 54 is determined (S1). When the document edge sensor 54 detects that there is no document S (the document edge sensor 54 is blocked), the setting operation is started (S2). When the document edge sensor 54 detects that there is a document (the document edge sensor 54 is not blocked), it is determined that the upper document guide 16 is released,
When error processing is performed and the document sensor 52 and the document edge sensor 54 return to the state of no document, the process returns to the beginning (S).
3).

The error processing includes displaying an error message, transmitting an error sound, and prohibiting the input of a specific input switch (start of sheet feeding by a sheet feeding button or sheet feeding by a sheet feeding command). This prevents erroneous operation. Also,
After the error processing, the document sensor 52 and the document edge sensor 5
The reason why 4 returns to the beginning of the process after returning to the "no document" state is to prevent malfunction when the document S remains in the document guide.

After the setting operation and before the start of the paper feeding operation, if the document edge sensor 54 detects that the document S remains "absent", the flow advances to the processing for determining the start of the paper feeding operation (S4). After the setting operation and before the start of the paper feeding operation, when the document edge sensor 54 detects that the document S is present, it is determined that the upper document guide 16 is released, error processing is performed, and the process returns to the beginning (S5). . When the paper feed operation start is input from the input switch, the paper feed operation is performed and the process proceeds to the next process (S6). If not started, the process returns to the previous process (S7).

FIG. 7 shows an example of a timing chart of the present invention.

In FIG. 7A, the document guide is not released,
6 is a timing chart when the paper is normally fed. Figure 7
(B) is an example when the document guide is released.

FIG. 8 shows an example of a block diagram of the present invention. It is composed of a sensor, an LCD (display), a speaker, a drive motor, an input switch, and a CPU (central processing unit), and control / judgment is performed by the CPU.

As described above, the document actuator 51,
By detecting the state of the document sensor 52 and the document edge sensor 54 by configuring the document sensor 52, the document edge actuator 53, and the document edge sensor 54, it is possible to detect the release of the upper document guide without a dedicated sensor. The paper feed control can be performed accordingly.

FIG. 9 shows a modification of the first embodiment.

The arrangement position of the document edge sensor 54 is changed. The guide lock 50 is also composed of a lock sesame 50c and a leaf spring 50d. When the upper document guide 16 is released, the detection state of the document edge sensor 54 changes as shown in FIG. 9B.

In this way, if the guide edge sensor and the document sensor are arranged so that the detection states are constant when the guide is released, the release mechanism, the sensor, and the actuator may have any form and shape. There is no limit.

The control, the timing chart and the block diagram also include all the control performed by detecting the release of the guide, and FIGS. 6, 7 and 8 are examples and are not limiting.

Next, a second embodiment will be described with reference to FIGS.

The operation of the document actuator 51, the document sensor 52, the document edge actuator 53, and the document edge sensor 54 when the upper document guide 16 is released, which is a feature of the present invention, will be described with reference to FIGS. The left-handed rotation of the actuators 51 and 53 is restrained so as to stand still at the position shown in FIG.

As shown in FIG. 3A, when the upper document guide 16 is fixed when there is no document S, the document actuator 51 is blocking the document sensor 52, and the document edge actuator 53 is the document edge sensor 54. Is blocking. When the upper document guide 16 starts to be released as shown in FIG. 10A, the document edge actuator 53 does not block the document edge sensor 54. When it is further released as shown in FIG. 10B, the document actuator 51 also rotates rightward by its own weight and does not block the document sensor 52.

As shown in FIG. 3B, when the upper document guide 16 is fixed when the document S is set,
The document actuator 51 and the document sensor 52 are not blocked, and the document edge actuator 53 blocks the document edge sensor 54. When the upper document guide 16 starts to be released as shown in FIG.
First, the document sensor 52 is turned counterclockwise to block the document sensor 52, and the document edge actuator 53 remains blocked from the document edge sensor 54. When further released, as shown in FIG. 11 (b),
The document edge actuator 53 is rotated clockwise so as not to block the document edge sensor 54, and the document actuator 51 remains blocking the document sensor 52. When further released, as shown in FIG. 11C, the document actuator 51 also rotates rightward by its own weight in accordance with the release angle and does not block the document sensor 52.

As shown in FIG. 4B, when the upper document guide 16 is fixed while the document S is being fed and conveyed, the document actuator 51 does not block the document sensor 52, and the document edge actuator 53 is also the document. The edge sensor 54 is not blocked. When the upper document guide 16 is released as shown in FIG. 12A, the document edge actuator 53 blocks the document edge sensor 54, and the document actuator 51 also blocks the document sensor 52. When further released as shown in FIG. 12B, the document edge actuator 53 does not block the document edge sensor 54 and the document actuator 5
Reference numeral 1 blocks the document sensor 52. When it is further released as shown in FIG. 12C, the document actuator 51 also does not block the document sensor 52.

With this configuration, when the upper document guide 16 is released, the document sensor 52 and the document edge sensor 54 are blocked first, and then the document edge sensor 54 detects the detection state before the document sensor 52. Change from "block" to "do not block".

On the contrary, when the upper document guide 16 is fixed, the document sensor 54 changes the detection state from "not block" to "block" before the document edge sensor 54.

In the second embodiment, when the document sensor 52 and the document edge sensor 54 are in a blocked state, and the document edge sensor 54 changes the detection state from "blocked" to "not blocked", the upper document is It is determined that the guide 16 has been released, and then the upper document guide 16 is determined to be fixed when the document edge sensor 54 changes the detection state from “not blocked” to “blocked”.

13 and 14 show the control of the second invention.

FIG. 13 shows a document guide release detection routine. Document sensor 52 and document edge sensor 54 are OFF
The process proceeds to the next process of detecting (blocked) (S1). If not detected, the processing returns to the original processing (S7). When the document edge sensor 54 changes from OFF (blocked) to ON (not blocked) (S2), it is determined that the document guide is released, and error processing is performed (S3). The error processing includes stopping the paper feeding operation, displaying an error message, transmitting an error sound, and prohibiting the input of a specific input switch. This prevents the operation. If the document edge sensor 54 does not change from OFF (blocked) to ON (not blocked), the process returns to the original process (S8). After the error processing (S4), when the document edge sensor 54 changes from ON (not blocked) to OFF (blocked) (S5), it is determined that the document guide is fixed and the process returns to the standby state (S6). Document edge sensor 5
If 4 does not change from ON (not blocked) to OFF (blocked), it is determined that the document guide is still released, and error processing is continued (S9).

FIG. 14 shows the control when the document guide detection routine is included in the control of the paper feeding operation. A document guide detection routine is inserted between each operation.

FIG. 15 shows an example of a timing chart of the second invention. FIG. 15A is a timing chart when the document guide is not released and is fed normally.
FIG. 15B is an example when the document guide is released.

FIG. 16 shows a modification of the second embodiment.

The document edge sensor 54 is replaced with a reflection type sensor. The document edge actuator 53 is also changed to a different shape with a reflection plate.

As shown in FIG. 16A, when there is no document, both the document sensor and the document edge sensor are in the "no document" state. As shown in FIG. 16B, when there is a document, both the document sensor and the document edge sensor are in the "document present" state.
When the upper document guide 16 is released, as shown in FIG.
Since the document edge sensor 54 is separated from the document S, there is no document and the document sensor also has no document. When the document is further released, the document edge actuator moves and the document exists, as shown in FIG. At this time, the document sensor is in the state of no document. Further, when released, the document sensor also changes to the document present state as shown in FIG. 17 (c).

On the contrary, when the document guide is fixed, the operation opposite to that when it is released is performed.

As described above, if the guide edge sensor and the document sensor are arranged so that the detection states of the document sensor are displaced and changed when the guide is released, the release mechanism, the sensor, and the actuator may have any shape and shape. Is not meant to be limited.

The control, the timing chart and the block diagram also include all the controls performed by detecting the release of the guide, and FIGS. 13, 14 and 15 are examples and are not limited.

Next, the recording section will be described for reference.

The recording section 4 emits a modulation signal from the laser beam oscillator 9a of the laser scanner 9 based on the image signal output from the control section 21, and the modulated beam is sent by the polygon mirror 9b to the photoconductor of the image forming section 10. Recording information is formed by irradiating the drum 10a with scanning light to form image information on the surface of the photosensitive drum 10a, and is fed from the cassette paper feeding unit 11, the second cassette unit 27 or the MP cassette unit 13 to the image forming unit 10. After the image information is transferred and fixed on the paper S ′, the paper is discharged to the recording paper stack tray 12.

The photosensitive drum 10a is incorporated into the recording cartridge 10e together with the primary charger 10b, the developing roller 10c, and the cleaning roller 10d, and is detachably attached to the apparatus main body 1. Then, the surface of the photosensitive drum 10a is uniformly charged by the primary charger 10b, and when the scanning light is reflected on the surface of the polygon mirror 9b and reflected by the folding mirror 9c, a latent image is formed, and the latent image is formed on the developing roller. The toner is supplied from 10c so as to be visualized.

A transfer charging device 10f is arranged around the photosensitive drum 10a of the image forming section 10, and the thermal fixing device 10 is provided in the recording paper conveying path downstream of the photosensitive drum 10a.
g, a paper discharge roller 10h are arranged.

After the toner image formed on the surface of the photosensitive drum 10a is transferred onto the recording paper S'by the transfer charger 10f,
The toner image is conveyed along the conveyance guide 23, the toner image is fixed by the thermal fixing device 10g, and the recording paper is ejected to the recording paper ejection tray 12 by the ejection roller 10h.

The MP cassette unit 13 is arranged slightly below the center of the apparatus main body 1. The recording sheets S ′ loaded on the MP cassette 13a are attached to the MP intermediate plate 13 by the pressure contact member 13b.
When c is rotated upward, it is pressed against the MP separation roller 30a and separated one by one by the MP separation pad 30b (friction piece separation method).
c, and further includes a conveyance roller 28a and a cover-side U-turn guide 28 arranged on the light cover 28.
b and the main body side U-turn guide 28c arranged on the apparatus main body 1 side are reversed. Further, the recording sheet S ′ being fed
Is detected by the registration sensor 28d, the paper is fed and the image output timing is adjusted so that the front edge of the toner image formed on the photosensitive drum 10a and the front edge of the recording sheet S'match, and then the transfer charger 10f. And photoconductor drum 10
It is transported to and from a. The image is recorded on the lower surface side of the recording paper S ′ loaded on the MP cassette 13a.

Further, the recording paper S'is regulated at its side end face and rear end face by the mounted MP regulating plate 13d which is movable in accordance with the recording paper size so that skewing and non-feeding do not occur. The size and presence / absence of the recording paper S ′ are detected by the MP cassette sensor 29. The maximum number of recording sheets that can be stacked is 100, and the recording sheets are pulled out to the left side toward the apparatus main body 1 (side loading method). The sizes of recording sheets that can be stacked are three types: A4, letter (LTR), and legal (LGL).

The cassette sheet feeding section 11 is arranged so that the top plate 11h of the cassette sheet feeding section 11 is in contact with the bottom lower surface of the apparatus main body 1, and the top surface of the top panel 11h is the bottom plate of the apparatus main body 1. There is. The recording sheet S ′ stacked in the sheet feeding cassette 11a has an intermediate plate 11e biased upward by an intermediate plate spring 11f, and a semicircular sheet feeding roller 11b and a pair of separating claws 11b.
The recording sheets S ′ are separated one by one by the d (claw separation method), and the separated recording paper S ′ is conveyed by the cassette conveying roller pair 11c, passes between the MP separation base 30c and the sheet passing guide 28e, and is conveyed by the conveying rollers. 28a, the cover side U-turn guide 28b arranged on the light cover 28, and the main body side U-turn guide 28c arranged on the apparatus main body 1 side. From this point, it is the same as the sheet feeding from the MP cassette unit 13 described above. The paper path joins immediately before the transport roller 28a. The image is recorded on the lower surface side of the recording paper S ′ stacked in the paper feed cassette 11a.

The number of stackable recording sheets in the cassette 11a is 5
It is configured to be pulled out to the front of the apparatus main body 1 (front loading method).
The stackable recording paper size is A4, Letter (LT
R).

As an option, it can be separated from and combined with the cassette paper feeding unit 11, and the number of stackable recording sheets of the entire apparatus can be changed from 100 sheets to 600 sheets.

The apparatus main body 1 is provided with a cartridge cover 14 which can be opened and closed. By opening the cartridge cover 14, the recording cartridge 10e is opened.
It can be pulled out and replaced. Further, the cartridge cover 14 is provided with an interlock mechanism so that the recording unit 4 does not operate when the cartridge cover 14 is open or the recording cartridge 10e is not set in the apparatus main body 1. Also,
The drum photosensitive prevention shutter 10i provided on the recording cartridge 10e is designed to interlock with the setting of the recording cartridge 10e to the apparatus main body 1. When the cartridge cover 14 is opened and the recording cartridge 10e is set to the apparatus main body 1, the shutter is released. 10i is opened, and when the recording cartridge 10e is taken out from the apparatus main body 1, the shutter 10i is closed to prevent unnecessary exposure of the photosensitive drum 10a.

The partitioning section 20 is a duct that separates the image reading section 3 and the recording section 4, and the image reading section 3 is adversely affected by the heat generated from the recording section 4 by flowing air by a fan (not shown). This prevents water vapor that is received or evaporated from the recording paper S ′ from condensing and dripping on the recording paper S ′.

The contact-type image sensor 7 uses L as a light source.
The image information surface of the original S is irradiated with light from the ED array, and the reflected light reflected from the image information surface is focused on the sensor element by the SELFOC lens to read the image information.

As described above, according to the embodiment of the present invention, the release of the sheet guide can be detected without using a dedicated sensor, and the sheet feeding operation is controlled accordingly. If the sheet guide is released when is not set, false detection of the sheet sensor does not occur. Therefore, the sheet setting operation is not performed, and noise is not generated due to malfunctions such as the rotation of the preparatory conveyance roller, the separation conveyance roller, the paper feed roller, and the paper discharge roller, and the operation is quiet.

(2) It is safe because normal operation cannot be performed while the seat guide is released and there is no possibility of erroneous operation.

(3) Since no dedicated sensor / part is required and the cost of parts and the number of assembly steps are the same, the cost is low. Serviceability does not deteriorate.

(4) Even if the sheet guide is released during operation, the operation stops without malfunction, there is no fear of noise or erroneous operation, and reliability is high and noise is low.

[0072]

Since the sheet conveying apparatus according to the present invention is configured as described above, it has an effect that it has excellent detection ability and is inexpensive.

[Brief description of drawings]

FIG. 1 is a perspective view of an entire facsimile apparatus embodying the present invention.

FIG. 2 is an external view of a facsimile apparatus embodying the present invention.

FIG. 3 is a detailed sectional view of a document feeding system embodying the present invention.

FIG. 4 is an operation explanatory diagram of FIG. 3;

5 is an explanatory diagram of the operation of FIG.

FIG. 6 is a flow chart for carrying out the present invention.

FIG. 7 is a timing chart for implementing the present invention.

FIG. 8 is a block diagram in which the present invention is implemented.

FIG. 9 is a sectional view of a document feeding system showing a modified example of the first embodiment of the present invention.

FIG. 10 is a sectional view of a document feeding system according to a second embodiment.

11 is an explanatory diagram of the operation of FIG.

12 is an explanatory diagram of the operation of FIG.

FIG. 13 is a flowchart of the second embodiment.

FIG. 14 is a flowchart of the second embodiment.

FIG. 15 is a timing chart of the second embodiment.

FIG. 16 is a sectional view of a document feeding system showing a modified example of the second embodiment.

FIG. 17 is an operation explanatory diagram of FIG. 16;

FIG. 18 is a flowchart of a conventional example.

FIG. 19 is a sectional view of a conventional document feeding system.

[Explanation of symbols]

1 Device Main Body 2 Document Placement Table 3 Image Reading Unit for Reading Image Information of Document S 5 Document Conveying Unit <Sheet Conveying Unit> 6 Document Pressing Unit 7 Contact Image Sensor 8 Document Ejecting Tray 10 Image Forming Unit 16 Upper Document Guide < Sheet guide means> 18 Original pressing plate 19 Lower original guide <Sheet guide means> 21 Control unit of facsimile machine 50 Guide lock <Guide lock means> 51 Original actuator <Sheet actuator> 52 Original sensor <Sheet sensor> 53 Original edge actuator < Sheet edge actuator> 54 Document edge sensor <Sheet edge sensor> 55 Sheet guide dedicated sensor

Claims (5)

[Claims] 1. A sheet transporting device capable of opening and closing, wherein a sheet presence / absence detection sensor having an actuator whose posture is changed is also used as a sheet transport path opening / closing detection sensor. 2. A sheet conveying means for conveying a sheet, a sheet guide means for forming a sheet conveying path from an upper sheet guide and a lower sheet guide, a sheet actuator and a sheet sensor for detecting whether a sheet is set, and a sheet. A sheet edge actuator for detecting the edge of the sheet and a sheet edge sensor, wherein the sheet actuator is capable of opening and closing, and the sheet actuator detects the state of detection by the sheet sensor when the sheet conveying path is opened, An openable / closable sheet conveying device characterized in that an edge actuator is configured so that the detection state of the sheet edge sensor is constant, and the open / closed state is known from the detection state of the sheet edge sensor. 3. A sheet conveying means for conveying a sheet, a sheet guide means for forming a sheet conveying path from an upper sheet guide and a lower sheet guide, a sheet actuator for detecting whether a sheet is set, and a sheet sensor, A sheet edge actuator for detecting the edge of the sheet and a sheet edge sensor, wherein the sheet actuator changes the detection state of the sheet sensor, and the sheet edge actuator detects the state of the sheet edge sensor. The sheet sensor and the sheet edge sensor are arranged so that the timings of the changes in the detection states of the sheet sensor and the sheet edge sensor are deviated at this time. Characterized by knowing the open / closed state That, openable sheet conveying device. 4. When the sheet conveying path is opened, first, the sheet sensor and the sheet edge sensor are in a state of no sheet,
4. The sheet edge sensor is arranged so as to change from the state without a sheet to the state with a sheet prior to the sheet sensor, and it is determined that the sheet has been opened due to this change, and control is performed according to the change. Sheet transport device. 5. When the sheet conveying path is closed, first, the sheet sensor changes the state with the sheet to the state without the sheet before the sheet edge sensor, and then changes the sheet sensor and the sheet edge sensor to the state without the sheet. 5. The sheet conveying apparatus according to claim 4, wherein the sheet sensor and the sheet edge sensor are arranged so as to be in a sheet-less state, and it is determined that the sheet is closed due to this change, and control is performed accordingly.