JP2013051483A - Automatic document conveying device and document reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fall prevention members which prevent documents from falling out with simple structure.SOLUTION: An automatic document conveying device 100b comprises a document conveying unit 5, a paper output tray 4, and a document tray 6. The paper output tray 4 is provided in the document conveying unit 5. The document tray 6 is also provided in the document conveying unit 5 facing the paper output tray 4, and comprises fall prevention members 10 (10a, 10b, ...) on its back face opposite to the paper output tray 4 for preventing documents in the paper output tray 4 from falling out.

Description

  The present invention relates to an automatic document feeder and a document reading device.

A multifunction device capable of printing or the like includes a paper tray for storing paper and a document reading device above the paper tray. The document reading device includes a document reading unit for reading an image of a document, a document table, a document cover, and an automatic document feeder. The document table is a table on which a document is placed. The document cover is provided on the upper part of the document table, and holds down the document placed on the document table. When the user places the document on the document table, closes the document cover, and then operates a predetermined button, the document reading unit can read the image of the document.
The automatic document transport device includes a document transport unit for automatically transporting a document, a document tray for supplying a document to the document transport unit, and a paper discharge tray. As another method of reading a document with the document reading unit, a user places a document to be read on a document tray and operates a predetermined button. Thereby, the document conveying unit conveys the document to the document reading unit, and the document reading unit reads the image of the document. Thereafter, the document is discharged to a discharge tray above the document cover.

  If the document cover is opened while the document remains on the discharge tray, the document on the discharge tray may fall from the gap between the discharge tray and the document tray. Patent Document 1 discloses a configuration in which a document pressing member that operates in response to opening and closing of a document cover is provided on the document cover, and when the document cover is opened, the document is pressed by a protrusion of the document pressing member. Yes.

JP-A-9-65029

  In the conventional configuration, the document pressing member needs to be provided on the document cover so as to operate in conjunction with the document cover. For this purpose, it is necessary to change the structure of the document cover, adjust the interlocking operation between the document pressing member and the document cover, etc., increasing the number of manufacturing processes and making the structure complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to realize prevention of dropping of a document with a simple configuration.

  Hereinafter, a plurality of modes will be described as means for solving the problems. These aspects can be arbitrarily combined as necessary.

  An automatic document feeder according to an aspect of the present invention includes a document feeder, a paper discharge tray, and a document tray. The paper discharge tray is provided in the document transport unit. The document tray is provided in the document transport unit so as to face the paper discharge tray, and includes a fall prevention member for preventing the document on the paper discharge tray from dropping on the back surface that is the surface facing the paper discharge tray.

When the user places a document on the document tray and presses a predetermined button, the document transport unit takes the document from the document tray and discharges the document to the discharge tray. If the output tray is tilted while the original is placed on the output tray, the original on the output tray will have a force in the direction of dropping from the gap between the output tray and the original tray due to its own weight. Works. Since the document tray is provided with a fall prevention member on the back surface, the document on the paper discharge tray is supported by the fall prevention member at this time. Therefore, it is possible to prevent the document from dropping from the gap between the paper discharge tray and the document tray.
For example, the fall prevention member itself has a simple structure such as a plate-like plate, and may be simply attached to the back side of the document tray. Therefore, the document can be prevented from dropping by using a simple configuration.

In the automatic document feeder, the fall prevention member may be formed so as to protrude from the back surface of the document tray toward the discharge tray side.
Since the fall prevention member is formed so as to protrude, it can support the original that has been bent from the paper discharge tray toward the original tray.

In the automatic document feeder, the fall prevention member may be provided on the rotating shaft side for opening and closing the document cover on which the document transport unit is placed, on the back surface of the document tray.
If the document cover is rotated around the rotation axis and opened, the document on the paper discharge tray is bent and falls on the document tray. At this time, a greater weight is applied to the document on the side closer to the rotation axis of the document cover than on the side far from the rotation axis. Therefore, by providing the fall prevention member on the rotating shaft side on which a greater weight is applied, it is possible to efficiently support the document to be dropped from the paper discharge tray. That is, even if the number of fall prevention members is small, it is possible to reliably prevent the document from dropping.

In the automatic document feeder, the paper discharge tray may include a regulating member that prevents movement of the document.
If the document cover is rotated around the rotation axis and opened, the document on the paper discharge tray is supported by the regulating member on the first side close to the rotation axis side. At this time, the paper surface between the first side of the document and the second side opposite to the first side is bent, and the vicinity of the apex of the bending is supported by the fall prevention member. As described above, the restricting member, together with the fall preventing member, prevents the document from dropping.

  The document reading apparatus includes a document table, a document cover, and the automatic document conveying device described above. A document is placed on the document table. The document cover can be opened and closed with respect to the document table. The automatic document feeder is placed on the document cover.

When the user places a document on the document tray and presses a predetermined button, the document conveying unit takes in the document on the document tray and conveys the document to the document reading unit in the document reading apparatus. The document that has been read by the document reading unit is discharged to a discharge tray. If the document cover is opened with the document placed on the sheet discharge tray, the sheet discharge tray is provided on the document cover, so that the sheet discharge tray is inclined with respect to the document table in the same manner as the document cover. At this time, a force acts on the document in the paper discharge tray in the direction of dropping from the gap between the paper discharge tray and the document tray due to its own weight. Since the document tray is provided with a fall prevention member on the back surface, the document on the paper discharge tray is supported by the fall prevention member at this time. Therefore, it is possible to prevent the document from dropping from the gap between the paper discharge tray and the document tray.
For example, the fall prevention member itself has a simple structure such as a plate-like plate, and may be simply attached to the back side of the document tray. Therefore, the document can be prevented from dropping by using a simple configuration.

  The automatic document feeder and the document reading device according to the present invention can prevent the document from being dropped with a simple configuration.

1 is a perspective view illustrating an external configuration of a multifunction machine. FIG. 3 is a front view of the upper part of the multifunction machine as seen from the user's standing position side. FIG. 3 is a configuration diagram of the back side of a document tray. FIG. 3 is a side view of the upper part of the multi-function machine as seen from the document discharge direction. FIG. 2 is a perspective view of a multifunction machine in which a document cover is open. FIG. 3 is an explanatory diagram of a state in which a document is supported by a fall prevention member as viewed from the side of the multifunction peripheral. FIG. 6 is an explanatory diagram of a state in which a document is supported by a regulating member as viewed from the side of the multifunction peripheral. FIG. 6 is another configuration diagram showing the back side of the document tray.

(1) Overall Configuration of Multifunction Device FIG. 1 is a perspective view showing an external configuration of a multifunction device.
The multifunction device 100 is a device having a plurality of functions such as printing, facsimile communication, and a document reading function. The multi-function device 100 includes a document reading device 100a at the top and a paper tray 9 at the bottom. The document reading device 100a includes, for example, a document reading unit 1, a document table 2, a document cover 3, an operation panel 8, an automatic document feeder 100b, and the like. Further, the automatic document feeder 100b includes, for example, a paper discharge tray 4, a document feeder 5, a document tray 6, a guide 7, and the like. These configurations will be described below.
A document table 2 for placing a document on the upper surface of the document reading unit 1 is provided. The document table 2 is formed of, for example, a glass surface, and the document reading unit 1 reads an image by scanning the document with light irradiated through the document table 2. Alternatively, the document reading unit 1 reads an image by irradiating light to a document transported from a document transport unit 5 described later.

  On the document table 2, a document cover 3 for pressing a document placed on the document table 2 is provided. The document cover 3 is formed to be openable and closable around the rotation axis. The user opens the document cover 3 to place the document on the document table 2 and presses the document cover 3 to hold the document on the document table 2. close up. Further, after the reading of the document is completed, the user can open the document cover 3 and remove the document from the document table 2. The document cover 3 has, for example, a rectangular shape, and a mechanism serving as a rotation shaft is provided on the side opposite to the side on the user's standing position side. Therefore, the user can open the document cover 3 by lifting the document cover 3 from the standing position side about the rotation axis toward the back side.

  On the document cover 3, a document transport unit 5 and a document tray 6 for supplying documents to the document transport unit 5 are provided. The document transport unit 5 transports a document from the document tray 6 to the document reading unit 1 when the user places a document on the document tray 6 and presses a predetermined button. The document reading unit 1 reads an image of the conveyed document. The document tray 6 is provided with a guide 7, and the user can position the document by adjusting the guide 7. Although not shown in FIG. 1, a fall prevention member 10 a that protrudes from the document tray 6 toward the sheet discharge tray 4 is provided on the back surface of the document tray 6.

Between the document tray 6 and the document cover 3, a paper discharge tray 4 on which a document discharged from the document transport unit 5 is placed is further provided. In FIG. 1, the upper surface of the document cover 3 forms the paper discharge tray 4, but a paper discharge tray may be provided separately from the document cover 3.
The document transport unit 5, the document tray 6, the paper discharge tray 4, and the like are attached so as to move together with the document cover 3. For example, the document conveying section 5, the document tray 6, and the paper discharge tray 4, which are different components, are fixed by being engaged with each other. Alternatively, at least two or more components such as the document conveying unit 5, the document tray 6, and the paper discharge tray 4 may be formed inseparably. For example, the document tray 6 and the document conveyance unit 5 may be formed inseparably. With such a configuration, the document transport unit 5, the document tray 6, the paper discharge tray 4, and the like move integrally with the document cover 3 when the document cover 3 is opened and closed.

  An operation panel 8 is provided on the user's standing position side of the multifunction device 100, and the user operates the operation buttons and the liquid crystal panel in the operation panel 8 to cause the multifunction device 100 to execute a desired operation. Further, a sheet tray 9 for storing sheets is provided at the lower part of the multifunction peripheral 100, and sheets of various sizes are stored.

(2) Fall Prevention Member (2-1) Outline of Fall Prevention Member FIG. 2 is a front view of the multifunction device viewed from the user's standing position side, and FIG. 3 is a configuration diagram of the back side of the document tray. FIG. 3 is a side view of the upper part of the multi-function device as viewed from the document discharge direction.

  A fall prevention member 10a protruding from the bottom 6c is provided on the bottom 6c, which is the back surface opposite to the surface on which the document is placed on the document tray 6. That is, the fall prevention member 10 a is formed to protrude from the document tray 6 toward the paper discharge tray 4 at a predetermined height. Further, the fall prevention member 10 a is formed by a plate-like member extending along the direction of taking in the original from the original tray 6 or the direction of discharging the original from the original conveying section 5. In the configuration of FIG. 3, in particular, the fall prevention member 10 a is formed along the longitudinal direction of the document tray 6. The fall prevention member 10 a is attached so that the plate-like surface portion thereof is substantially orthogonal to the surface portion of the document tray 6.

  As shown in FIG. 3, the document tray 6 is provided with locking portions 6a and 6b, and the document tray 6 is attached to the document conveying portion 5 via the locking portions 6a and 6b. The locking portion 6b is provided on the rotating shaft side of the document cover 3 with respect to the locking portion 6a, and the fall prevention member 10a is provided on the locking portion 6b side with respect to the locking portion 6a.

(2-2) Usage State of Fall Prevention Member FIG. 5 is a perspective view of the multifunction machine in which the document cover is open, and FIG. 6 shows a side view of the multifunction machine where the document is supported by the fall prevention member. It is explanatory drawing seen from.

  When the user places a document on the document tray 6 and presses a predetermined button on the operation panel 8, the document transport unit 5 transports the document from the document tray 6 to the document reading unit 1. The document that has been read by the document reading unit 1 is discharged to the paper discharge tray 4. Here, if the document cover 3 is opened with the document placed on the sheet discharge tray 4 as shown in FIG. 5, the sheet discharge tray 4 is inclined with respect to the document table 2 in the same manner as the document cover 3. The document on the paper tray 4 moves in the direction of dropping. That is, as shown in FIG. 6, a force acts on the document 20 on the paper discharge tray 4 in the direction of dropping from the gap between the paper discharge tray 4 and the document tray 6 due to its own weight, and the document 20 bends. However, the document tray 6 falls over.

Since the fall prevention member 10a is provided on the bottom 6c which is the back surface of the document tray 6 of the present embodiment, the fall prevention member 10a supports the document 20 bent toward the document tray 6 side. Therefore, even when the document cover 3 is opened, the document 20 on the paper discharge tray 4 can be prevented from dropping from the gap between the paper discharge tray 4 and the document tray 6.
The document 20 may be supported not only by the fall prevention member 10 a but also by the paper discharge tray 4 and the document tray 6. That is, as shown in FIG. 6, the first side 20 a close to the rotation axis of the original 20 is supported on the upper surface of the paper discharge tray 4, and the second side 20 b facing the first side 20 a of the original 20 is the original tray 6. The portion 20c of the original 20 that is largely bent can be supported by the fall prevention member 10a.

  Such a fall prevention member 10 has a simple configuration such as a plate-like plate, for example, and only needs to be attached to the back surface of the document tray 6. Therefore, the document can be prevented from dropping with a simple configuration.

(2-3) Position and Size of Fall Prevention Member The fall prevention member 10a is configured so that when the document cover 3 is opened with the document placed on the discharge tray 4 as described above, the document is removed from the discharge tray 4. It is provided at a position and a size that can support the original 20 that is bent and falls on the tray 6.

  For example, as shown in FIGS. 3 and 4, the fall prevention member 10 a is provided on the rotating shaft side of the document cover 3 with respect to the center of the back surface of the document tray 6. In FIG. 3, the locking portion 6b is provided closer to the rotating shaft of the document cover 3 than the locking portion 6a, and the fall prevention member 10a is provided closer to the locking portion 6b than the locking portion 6a. ing. By providing the fall prevention member 10a at such a position, the original 20 that is about to fall from between the paper discharge tray 4 and the original tray 6 as shown in FIG. The apex of the bending of the document 20 is, for example, a point at which the force to fall on the document 20 due to its own weight acts most. By supporting the apex of this deflection by the fall prevention member 10a, the document 20 can be prevented from dropping efficiently. That is, by providing the fall prevention member 10a at a point where a greater weight is applied, the document 20 can be reliably prevented from falling even if the number of fall prevention members 10a is small.

  More specifically, as shown in FIG. 4, the fall prevention member 10 a is provided at a position W <b> 1 from the rotation axis side of the document cover 3 with respect to the opening width W <b> 2 of the paper discharge tray 4. Here, the opening width W2 of the paper discharge tray 4 is defined by the end surfaces of the side walls 4b and 4c of the paper discharge tray 4, for example. If the opening width W2 and the starting point of the position W1 are defined by the end surface of the side wall 4c on the rotating shaft side and are “0”, the position of the end surface of the opposing side wall 4b is W2. Here, if the position W1 falls within the range of 10 to 60% from the rotation axis side with respect to the opening width W2 of the paper discharge tray 4, it is preferable that the document 20 can be prevented from dropping efficiently. Note that the position of 50% from the rotation axis side with respect to the opening width W2 means the center of the paper discharge tray 4. The rotation axis side of the document cover 3 is the side wall 4c side of the paper discharge tray 4 in FIG.

  Further, the fall prevention member 10a is formed at a height capable of supporting the original 20 that has been bent and bent from the paper discharge tray 4 to the original tray 6 side. For example, as shown in FIGS. 2 and 4, the height H <b> 1 of the fall prevention member 10 a is designed to be 10 to 90% of the opening width H <b> 2 between the bottom 6 c of the document tray 6 and the upper surface 4 a of the paper discharge tray 4. And preferred. Here, the height H1 of the fall prevention member 10a is a height at which the fall prevention member 10a protrudes from the bottom 6c of the document tray 6 as viewed from the front of the multifunction peripheral 100, for example, as shown in FIG. The opening width H <b> 2 is a width defined by the bottom 6 c of the document tray 6 and the upper surface 4 a of the paper discharge tray 4 when viewed from the front of the multifunction peripheral 100. Note that the height of the fall prevention member 10a is preferably a height that does not prevent the document from being discharged from the paper discharge tray 4, and further, does not interfere with the user taking out the document from the paper discharge tray 4. The height is preferred.

  The heights H1 of the fall prevention members 10a may be the same, but may be the same as long as the original 20 can be prevented from falling, and need not be the same. For example, the height H1 may change according to the inclination of the document tray 6. In the case of FIG. 2, the document tray 6 is inclined so that the opening width H <b> 2 increases as the distance from the document transport unit 5 increases. The fall prevention member 10a is formed such that its height H1 gradually increases from the point B where it begins to protrude from the bottom 6c of the document tray 6 to the vertex A. The height H1 is formed so that the height H1 gradually decreases from the apex A toward the side away from the document conveying section 5 in order to make it easy and safe to take out the document 20 from the discharge tray 4. ing. Eventually, from the point B to the vertex A, the distance (H2-H1) between the fall prevention member 10a and the paper discharge tray 4 can be designed to be substantially constant. Thus, the original 20 that is bent from the paper discharge tray 4 to the original tray 6 is not supported by one point of the fall prevention member 10a, but by a straight line from the point B to the vertex A of the fall prevention member 10a. I can support it. Therefore, it is possible to prevent the document from dropping more reliably.

(3) Effects of Embodiment The above embodiment can be expressed as follows.

(A) The automatic document feeder 100b includes a document feeder 5, a paper discharge tray 4, and a document tray 6. The paper discharge tray 4 is provided in the document conveying section 5. The document tray 6 is provided in the document transport unit 5 so as to face the paper discharge tray 4, and is dropped on the back surface that is the surface facing the paper discharge tray 4 to prevent the document on the paper discharge tray 4 from dropping. The prevention member 10 (10a, 10b ...) is included.
When the user places a document on the document tray 6 and presses a predetermined button, the document transport unit 5 takes the document from the document tray 6 and discharges the document to the paper discharge tray 4. If the paper discharge tray 4 is tilted while the original is placed on the paper discharge tray 4, the original on the paper discharge tray 4 falls from the gap between the paper discharge tray 4 and the document tray 6 due to its own weight. Force acts in the direction of Since the document tray 6 of the automatic document feeder 100b is provided with the fall prevention member 10 (10a, 10b...) On the back surface, the document on the paper discharge tray 4 is dropped at this time. 10b ...). Therefore, it is possible to prevent the document from dropping from the gap between the paper discharge tray 4 and the document tray 6.
The fall prevention member 10 (10a, 10b,...) Itself has a simple configuration such as a plate-like plate, for example, and the document tray 6 Just install it on the back of the. Therefore, the document can be prevented from dropping by using a simple configuration.

(B) In the automatic document feeder 100b, the fall prevention member 10 (10a, 10b...) Is formed so as to protrude from the back surface of the document tray 6 toward the sheet discharge tray 4 side.
The fall prevention member 10 (10a, 10b,...) Formed so as to protrude can support a document that has been bent from the discharge tray 4 to the document tray 6 side.

(C) In the automatic document feeder 100b, the fall prevention member 10 (10a, 10b,...) Rotates to open and close the document cover 3 on which the document feeder 5 is placed on the back surface of the document tray 6. It is provided on the shaft side.
When the document cover 3 is rotated around the rotation axis and opened, the document on the paper discharge tray 4 is tilted to the document tray 6 while being bent. At this time, a greater weight is applied to the document on the side closer to the rotation axis of the document cover 3 than on the side farther from the rotation axis. Therefore, by providing the fall prevention member 10 (10a, 10b,...) On the rotating shaft side on which a larger weight is applied, it is possible to efficiently support the document to be dropped from the paper discharge tray 4. That is, even with a small number of fall prevention members 10 (10a, 10b...), It is possible to reliably prevent the document from dropping.

(D) In the automatic document feeder 100b, the paper discharge tray 4 includes a regulating member 12 that prevents movement of the document.
If the document cover 3 is opened by rotating about the rotation axis, the first side near the rotation axis side of the document on the paper discharge tray 4 is supported by the regulating member 12. At this time, the paper surface between the first side of the document and the second side opposite to the first side is bent, and the fall prevention member 10 (10a, 10b,. ). As described above, the regulating member 12 together with the fall prevention member 10 (10a, 10b...) Prevents the document from dropping.

(E) The document reading apparatus 100a includes the document table 2, the document cover 3, and the automatic document feeder F described above. A document is placed on the document table 2. The document cover 3 can be opened and closed with respect to the document table 2. The automatic document feeder 100 b is placed on the document cover 3.
When the user places a document on the document tray 6 and presses a predetermined button, the document transport unit 5 takes in the document on the document tray 6 and transports the document to the document reading unit 1 in the document reading apparatus 100a. The document that has been read by the document reading unit 1 is discharged to the discharge tray 4. If the document cover 3 is opened with the document placed on the discharge tray 4, the discharge tray 4 is provided on the document cover 3. Tilt. At this time, a force acts on the document in the paper discharge tray 4 in the direction of dropping from the gap between the paper discharge tray 4 and the document tray 6 due to its own weight. Since the document tray 6 of the automatic document feeder 100b is provided with the fall prevention member 10 (10a, 10b...) On the back surface, the document on the paper discharge tray 4 is dropped at this time. 10b ...). Therefore, it is possible to prevent the document from dropping from the gap between the paper discharge tray 4 and the document tray 6.
The fall prevention member 10 (10a, 10b,...) Itself has a simple configuration such as a plate-like plate, for example, and the document tray 6 Just install it on the back of the. Therefore, the document can be prevented from dropping by using a simple configuration.

(4) Other Embodiments Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention. In particular, a plurality of embodiments and modifications described in this specification can be arbitrarily combined as necessary.

(A) In the above-described embodiment, the fall prevention member 10 a is provided on the back surface of the document tray 6. However, a regulating member 12 for preventing the document from dropping may be further provided on the upper surface of the discharge tray 4. .
FIG. 7 is an explanatory view of the state in which the document is supported by the restriction member, as viewed from the side of the multifunction machine. As shown in FIG. 7, a regulating member 12 that protrudes toward the document tray 6 is provided on the upper surface of the paper discharge tray 4. As shown in FIG. 5, when the document cover 3 is opened with the document placed on the paper discharge tray 4, the document 20 is bent toward the document tray 6 side while being bent. At this time, the first side 20 a close to the rotation axis of the original 20 is supported by the regulating member 12 on the paper discharge tray 4, and the second side 20 b facing the first side of the original 20 is supported on the back surface of the original tray 6. The large deflection portion 20c of the document 20 is supported by the fall prevention member 10a. Therefore, the fall of the document can be more reliably prevented by the cooperation of the regulating member 12 and the fall prevention member 10a.
In order to support the first side 20a of the document 20 that is close to the rotation axis of the document cover 3, the restriction member 12 is preferably provided on the rotation axis side of the fall prevention member 10a.
For example, the regulating member 12 may be formed by a plate-like member extending along the direction in which the document is discharged from the document conveying unit 5, or only a part of the first side 20 a of the document 20 is supported. It may be formed of a member made of small pieces.
When the document cover 3 also serves as the paper discharge tray 4, a restriction member 12 is provided on the document cover 3.

(B) In the image forming apparatus of the above embodiment, only one fall prevention member 10a is provided, but two or more fall prevention members 10a may be provided. FIG. 8 is another configuration diagram showing the back side of the document tray 6. As shown in FIG. 8, for example, two fall prevention members 10a and 10b are provided. Further, as shown in FIG. 8, in order to increase the strength of the document tray 6, reinforcing members 11a, 11b, 11c and the like may be provided separately from the fall prevention members 10a, 10b. The reinforcing members 11a, 11b, and 11c do not protrude from the back surface of the document tray 6.

(C) In the embodiment, the material of the fall prevention member 10 a is not particularly limited, but the fall prevention member 10 a may be formed of the same material as the document tray 6. Alternatively, the fall prevention member 10a may be formed of a material different from that of the document tray 6, and may be formed of, for example, a rubber-like member having a large frictional force. By increasing the frictional force between the fall prevention member 10a and the document 20, the document 20 can be prevented from dropping efficiently.

  The present invention can be widely applied to image forming apparatuses.

1 Document reader
2 Document table
3 Document cover
4 Output tray
4a Bottom surface 4b, 4c Side wall 5 Automatic document feeder
6 Document tray
6a, 6b Locking part
6c Bottom 7 Guide
8 Operation panel
9 Paper tray
10a, 10b Fall prevention member
11a, 11b, 11c Reinforcing member
12 Regulatory members
20 Document 20a First side 20b Second side 20c Large deflection portion 100 Multifunction device 100a Document reading device
100b Automatic document feeder

Claims (5)

A document transport section;
A paper discharge tray provided in the document conveying section;
A document that is provided in the document conveying section so as to face the paper discharge tray, and includes a fall prevention member for preventing the document on the paper discharge tray from dropping on the back surface that is the surface facing the paper discharge tray. A tray,
An automatic document feeder.   The automatic document feeder according to claim 1, wherein the fall prevention member is formed so as to protrude from the back surface of the document tray toward the discharge tray side.   The automatic document conveyance device according to claim 1, wherein the fall prevention member is provided on a rotating shaft side for opening and closing a document cover on which the document conveyance unit is placed on a back surface of the document tray. .   The automatic document feeder according to claim 1, wherein the discharge tray includes a regulating member that prevents movement of the document. A document table on which the document is placed;
A document cover that can be opened and closed with respect to the document table;
An automatic document feeder according to any one of claims 1 to 4, which is placed on the document cover;
A document reading apparatus comprising:

Images