JP3560039B2 - Automatic document feeder - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automatic document feeder provided in a document processing machine such as an electrostatic copying machine, a facsimile or an image reader.
[0002]
[Prior art]
2. Description of the Related Art In recent years, copiers have come to use an automatic document feeder that automatically supplies a plurality of documents sequentially to a document setting position on the upper surface of a transparent plate with the speeding up and automation of copying processing. Also, an automatic document feeder that automatically and sequentially feeds a plurality of documents to a document processing machine such as a facsimile or an image reader is widely used. This type of automatic document feeder includes a document table on which a document is placed, document loading means for feeding the document placed on the document table toward a transparent plate of a document processing machine, and a document feeding means. A transport belt mechanism that positions the fed document at a predetermined position on the transparent plate and transports the document along a document transport path formed on the transparent plate, and a document discharge unit that discharges the document transported by the transport belt mechanism. Is provided.
[0003]
The transport belt mechanism includes a support frame, a drive roller and a driven roller disposed in parallel with the support frame at an interval in the transport direction, and wound around the drive roller, the driven roller and the support frame. And an endless belt provided between the driving roller and the driven roller, and a belt pressing means for pressing the endless belt toward the transparent plate. The belt pressing means is composed of a plurality of pressing rollers disposed on the endless belt at predetermined intervals in the width direction.
[0004]
[Problems to be solved by the invention]
Thus, in the automatic document feeder provided with the above-described transfer belt mechanism, the endless belt and the document are rubbed at positions corresponding to the edge portions at both ends of each pressing roller. For this reason, when a document on which images are printed on both sides is conveyed, streak-like stains are generated on the endless belt at portions passing through both ends of each pressing roller. The dirt on the endless belt causes a document to be conveyed thereafter to be stained. In order to solve such a problem, a roller having substantially the same length as the width of the endless belt may be used instead of the pressing roller. However, the roller increases the weight and the cost. There is.
[0005]
The present invention has been made based on the above fact, and a main technical problem thereof is that an automatic belt having a transport belt mechanism capable of preventing contamination of an endless belt caused by an edge portion of a pressing member that presses the endless belt. An object of the present invention is to provide a document feeder.
[0006]
[Means for Solving the Problems]
According to the present invention, there is provided an automatic document feeder having a transport belt mechanism for transporting a document along a document transport path formed on a transparent plate of a document processor.
The transport belt mechanism includes a support frame, a driving roller and a driven roller disposed in parallel with the support frame at an interval in the transport direction, and winding the drive roller, the driven roller, and the support frame. A hung endless belt, and a belt pressing member disposed between the driving roller and the driven roller to press the endless belt toward the transparent plate,
The belt pressing member includes a pressing plate disposed in the width direction of the endless belt, having a length corresponding to the document conveying area, and mounted on a bottom plate of the support frame,
The pressing plate is formed of a sheet member having elasticity, and has a curved portion protruding toward the endless belt, the curved portion is formed so as to press the endless belt, and both sides in the moving direction of the endless belt. Affixed to the lower surface of the bottom plate by a double-sided adhesive tape or an adhesive,
An automatic document feeder is provided.
[0007]
The pressing plate is made of an elastic sheet member, and both end portions in the moving direction of the endless belt are engaged with a plurality of locking claws provided on the bottom plate. Further, the pressing plate is formed of a plate material having elasticity, and both end portions in the moving direction of the endless belt are engaged with a plurality of locking claws provided on the bottom plate. Further, the pressing plate is formed of a synthetic resin material, and a plurality of support portions are provided at intervals on both sides in the moving direction of the endless belt, and the plurality of support portions are respectively provided on the bottom plate. A coil spring with both ends engaged is hung and elastically supported.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of an automatic document feeder configured according to the present invention will be described in detail with reference to the accompanying drawings.
[0009]
1 and 2 show an upper end portion of the electrostatic copying machine 2 and an automatic document feeder 4 mounted thereon. The electrostatic copying machine 2 has a housing 6, and a transparent plate 8 (FIG. 2), which may be a glass plate, is provided on an upper surface of the housing 6. On one side (left side in FIG. 2) of the transparent plate 8, a document regulating member 10 for determining a document set reference position G is provided, and on the other side (right side in FIG. 2), a stationary mounting member 12 is provided. . The automatic document feeder 4 constructed in accordance with the present invention has a closed position indicated by a solid line in FIG. 1 on the upper surface of the housing 6 of the electrostatic copying machine 2 around a turning axis extending along the rear edge of the transparent plate 8. It is mounted to be pivotable between an open position indicated by a two-dot chain line. When manually placing a document on the transparent plate 8 of the electrostatic copying machine 2, the automatic document feeder 4 is opened to expose the transparent plate 8, and the document is placed at a required position on the transparent plate 8. Then, the automatic document feeder 4 is closed, and the transparent plate 8 and the original placed thereon are covered. When placing a document on the transparent plate 8, the document is placed in a desired position by abutting one edge of the document against the leading edge of the document regulating member 10 and positioning the trailing edge of the document at the document setting reference position G. Position. When the original is automatically loaded onto the transparent plate 8 using the automatic document feeder 4 and is automatically output from the transparent plate 8, the automatic document feeder 4 is positioned at the closed position.
[0010]
Continuing with reference to FIG. 1, the illustrated automatic document feeder 4 includes a front cover 14 and a rear cover 16 that are disposed at an interval in the front-rear direction (the direction perpendicular to the plane of FIG. 2). In. The front cover 14 and the rear cover 16 can be formed from an appropriate synthetic resin. A rear support substrate (not shown) is disposed in the rear cover 16, and such a rear support substrate is connected via a mounting mechanism (not shown) which may itself be a known form. Thus, it is mounted on the upper surface of the housing 6 of the electrostatic copying machine 2 so as to be pivotable. Various components of the automatic document feeder 4 are directly or indirectly supported by the rear support substrate. A document placing means 18 and a document discharge tray 20 are disposed between the front cover 14 and the rear cover 16. The document placing means 18 includes a document table 22 extending upward from the left end to the right rear end in FIG. 2 and an auxiliary table rotatably mounted on the rear end of the document table 22. 24. The document table 22 has a pair of width regulating members 26 movably in the width direction. The pair of width regulating members 26 are connected to each other below the document table 22 via a well-known rack and pinion mechanism (not shown), and approach each other in conjunction with each other. And in a direction away from each other. The document discharge tray 20 is disposed below the document placing means 18, and has a document placing surface 201 formed in a mountain shape when viewed from the front-back direction (a direction perpendicular to the paper surface in FIG. 2). A left end cover 28 is disposed between the left ends of the front cover 14 and the rear cover 16, and a right end cover 29 is disposed between the right ends.
[0011]
Continuing the description with reference to FIGS. 1 and 2, a forward feed unit 30 is provided downstream of the document table 22 in the transport direction. The forward feed unit 30 includes a guide plate 32 extending downstream of the document table 22 in the transport direction. An opening is formed on the upstream side of the guide plate 32, and a forward feed roller 34 constituting the forward feed means 30 is disposed below the opening. The forward feed roller 34 is formed of an elastic material having a high coefficient of friction such as urethane rubber, and is disposed so that a part of the outer peripheral surface slightly projects upward from an opening formed in the guide plate 32. The rotating shaft (not shown) of the forward feed roller 34 is operatively connected to an electric motor 35 as a drive source via a power transmission mechanism (not shown).
[0012]
Above the forward feed roller 34, a forward feed pressing mechanism 36 constituting the forward feed means 30 is provided. The forward feed pressurizing mechanism 36 includes a rotating shaft 362 disposed above the forward feed roller 34 in parallel with the forward feed roller 34, an upper end fixed to the rotating shaft 362, and a lower end located above the original document. And a pressing plate 364 which is placed on the table 22 and acts on the document (P) inserted on the guide plate 32. The pressing plate 364 is formed of an elastic thin plate made of a stainless steel plate in the illustrated embodiment, and the upper end thereof is fixed to the rotating shaft 362 by a fixing means such as a screw. The upper position of the feed roller 34 is configured to be positioned at an operation position that acts on the upper surface of the uppermost document placed on the document table 22 and presses the document, and a non-operation position that is separated from the document. . The rotating shaft 362 constituting the forward feed pressing mechanism 36 is connected to side plates 39, 39 provided at the front and rear ends of a support substrate 38 disposed above the forward feed roller 34 (the rear side plate 39 in FIG. 2). (Only one is shown). The rotating shaft 362 is connected to a solenoid (not shown) via a link mechanism, and is turned in a predetermined direction when the solenoid is energized, and is turned in a predetermined direction when the solenoid is deenergized. It is turned in the opposite direction. Therefore, the pressing plate 364 attached to the rotating shaft 362 presses the original inserted above the guide plate 32 when the solenoid (not shown) is urged to rotate the rotating shaft 362 in a predetermined direction. Is deenergized and the rotation shaft 362 is rotated in the direction opposite to the predetermined direction, and is separated from the document.
[0013]
A paper feed roller 40 is provided downstream of the advance unit 30. The paper feed roller 40 is formed of a material having a large friction coefficient, such as urethane rubber, and its rotation shaft is operatively connected to an electric motor 35 as a drive source via a power transmission mechanism (not shown). The paper feed roller 40 is disposed such that a part of the outer peripheral surface slightly protrudes upward from an opening formed in the guide plate 32.
[0014]
A document separation mechanism 50 is provided above the paper feed roller 40. The document separation mechanism 50 includes a separation roller 51 in the illustrated embodiment. The separation roller 52 includes a fixed shaft 52, a cylindrical portion 53 formed of an appropriate synthetic resin and rotatably disposed on the fixed shaft 52, and a cylindrical portion formed of an elastic material having a large friction coefficient such as urethane rubber. 53, a surface layer 54 mounted on the outer peripheral surface of the sheet feeding roller 40, and a torque limiter mechanism 55 disposed between the fixed shaft 52 and the cylindrical portion 53. 46 is provided in contact with the outer peripheral surface. The torque limiter mechanism 55 includes a spring clutch mechanism that fixes the tubular portion 53 to the fixed shaft 52 when a predetermined or more driving torque acts on the tubular portion 53. The separation roller 51 provided with the torque limiter mechanism 55 does not constitute a novel feature of the automatic document feeder constituted according to the present invention, and the constitution itself may be a known form. The details are omitted in this specification. In the illustrated embodiment, an example is shown in which the separation roller 52 is used as the document separation mechanism 50, but a separation belt mechanism or another separation mechanism can be used as the document separation mechanism 50.
[0015]
On the upstream side of the document separation mechanism 50 in the transport direction, a front separation unit 60 is disposed so as to face the paper feed roller 40. The front separating means 60 includes a front separating support plate 64 disposed in the axial direction of the sheet feeding roller 40 and having an upper end attached to the support substrate 38 by a screw 52, and an upper end formed on the lower end of the front separating support plate 64. The front handling plate 66 is mounted. The pre-separation plate 66 is formed of an elastic sheet member such as a polyethylene terephthalate (PET) resin sheet member, and the upper end thereof is mounted on the pre-separation support plate 66 by a fixing member such as an adhesive or a double-sided adhesive tape. ing.
[0016]
Continuing the description with reference to FIG. 2, a transport belt mechanism 70 is provided below the document placing means 18. The transport belt mechanism 70 includes a support frame 71, a drive roller 72 and a driven roller 73 that are disposed in parallel with the support frame 71 at intervals in the transport direction, and the drive roller 72 and the driven roller 73. An endless belt 74 wound around a frame 71, and a plurality of belt pressing members 75 disposed between the driving roller 72 and the driven roller 73 at intervals in the transport direction (the left-right direction in FIG. 2). It is composed of The drive roller 72 and the driven roller 73 are rotatable at both ends in the transport direction of the front and rear side plates 711, 711 (only the rear side plate 711 is shown in FIG. 2) of the support frame 71. The driving roller 72 is operatively connected to an electric motor (not shown) via a suitable power transmission mechanism. The lower running portion of the endless belt 74 of the transport belt mechanism 70 having such a configuration is extended along the transparent plate 8 of the electrostatic copying machine 2, and a document transport path 76 is defined between the two. .
[0017]
Next, the belt pressing member 75 will be described with reference to each embodiment shown in FIGS.
In the first embodiment shown in FIG. 3, the belt pressing member 75 includes a pressing plate 751 formed of an elastic sheet member such as a polyethylene terephthalate (PET) resin sheet member, and conveys the document in the width direction of the endless belt 74. It has a length corresponding to the area. The pressing plate 751 projects toward the endless belt 74 and is curved, and both sides of the endless belt 74 in the moving direction (left and right directions in FIG. 3) are attached to the lower surface of the bottom plate 712 constituting the support frame 71 by double-sided adhesive tape 77. 77 or an appropriate adhesive. The pressing plate 751 formed by bending the sheet member in this manner presses the back surface of the endless belt 74 whose curved portion 751a passes below the transparent roller 8 between the driving roller 72 and the driven roller 73.
Since the pressing plate 751 in the first embodiment shown in FIG. 3 has a length corresponding to the document transport area of the endless belt 74, the edge of the document transport area wants to exist. It is possible to prevent the endless belt from being stained by the edge of the pressing member. Further, since the pressing plate 751 is made of a sheet member, it can be manufactured lightweight and inexpensively.
[0018]
In the second embodiment shown in FIG. 4, the mounting structure of the pressing plate 751 made of an elastic sheet member in the first embodiment to the bottom plate 712 is changed. That is, locking pawls 712a, 712a formed by cutting and raising downward at predetermined intervals in the transport direction are provided at positions on the bottom plate 712 where the pressing plate 751 is mounted. Then, the pressing plate 751 is protruded toward the endless belt 74 and is curved, and both sides in the moving direction of the endless belt 74 are engaged with the locking claws 712a and 712a, respectively, and mounted. In this embodiment, a double-sided adhesive tape is not required as compared with the first embodiment, and the mounting work becomes easier.
[0019]
In the third embodiment shown in FIG. 5, the belt pressing member 75 is formed of a spring steel plate. The pressing plate 753 formed of a spring steel plate has a length corresponding to the document conveyance area in the width direction of the endless belt 74, and has a curved portion 753a at the center. A plurality of notches 753b are formed on both sides of the pressing plate 753 in the moving direction of the endless belt 74, and a plurality of support portions 753c are provided. On the other hand, the bottom plate 712 of the support frame 71 has an opening 712b extending in the width direction. The opening 712b has a length in the width direction corresponding to the pressing plate 753. In addition, a plurality of locking claws formed by cutting and raising the bottom plate 712 at both sides of the opening 712b in the moving direction of the endless belt 74 at intervals corresponding to the plurality of support portions 753c of the pressing plate 753. 712c is provided. Then, the plurality of support portions 753c of the pressing plate 753 are engaged with the plurality of locking claws 712c, and the curved portion 753a is projected downward through the opening 712b. The rear surface of the endless belt 74 passing through the plate 8 is pressed. The third embodiment configured as described above also has the same operation and effects as those of the first embodiment and the second embodiment. In the embodiment shown in FIG. 5, the pressing plate 753 is formed of a spring steel plate. However, even if the pressing plate 753 is similarly formed of a plate material such as a suitable elastic synthetic resin, the pressing plate 753 is different from the embodiment shown in FIG. A similar effect can be obtained.
[0020]
In the fourth embodiment shown in FIG. 6, the belt pressing member 75 is formed of a synthetic resin. The pressing plate 754 formed of a synthetic resin has a curved portion 754a at the center and a plurality of cutouts 754b at both sides, similarly to the pressing plate 753 in the third embodiment shown in FIG. A plurality of support portions 754c are provided. The pressing plate 754 in this embodiment does not necessarily require that the synthetic resin material has elasticity. On the other hand, an opening 712b extending in the width direction is formed in the bottom plate 712 of the support frame 71 similarly to the third embodiment shown in FIG. 5, and both sides of the pressing plate 754 are provided on both sides of the opening 712b in the transport direction. A plurality of locking holes 712d formed at intervals corresponding to the plurality of spring support portions 754c provided in the portion are provided. Then, the curved portion 754a of the pressing plate 754 is inserted into the opening 712b formed in the bottom plate 712 of the support frame body 71 from above, and the coil springs 77 are respectively hung on the plurality of spring support portions 754c, and both ends thereof are locked holes. 712d. Therefore, in the embodiment shown in FIG. 6, the curved portion 754a of the pressing plate 754 presses the back surface of the endless belt 74 by the spring force of the coil spring 77.
[0021]
Returning to FIG. 2, the description will be continued. A document carrying path 80 is formed between the document carrying path 705 and the paper feed roller 40. This document carrying path 80 is defined by an inner guide plate 801 and an outer guide plate 802. A registration roller pair 82 is provided in the document carrying path 80. The registration roller pair 82 includes a driving roller 821 and a driven roller 822. The drive roller 821 of the pair of registration rollers 82 is operatively connected to an electric motor (not shown) via an appropriate power transmission mechanism.
[0022]
A document discharging means 90 is provided on the right side of the document conveying path 76 in FIG. The document discharge means 90 includes a document discharge path 92, a pair of conveyance rollers 94 disposed in the document discharge path 92, and a discharge roller pair 96 disposed at a discharge side end of the document discharge path 92. I have. The transport roller pair 94 includes a drive roller 941 and a driven roller 942, and the discharge roller pair 96 also includes a drive roller 961 and a driven roller 962. The drive roller 941 of the transport roller pair 94 and the drive roller 961 of the discharge roller pair 96 are operatively connected to an electric motor (not shown) via an appropriate power transmission mechanism.
[0023]
The automatic document feeder in the illustrated embodiment is configured as described above, and the operation and effect thereof will be described below.
In performing the copying operation, the operator first places the document P to be copied on the document table 22, inserts the document P forward, and positions the front end of the document P above the forward feed roller 32. When the copy start key is pressed by the operator, the solenoid (not shown) of the forward feed pressing mechanism 36 is urged, and the pressing plate 364 is positioned at the operation position, and presses the original P inserted on the guide plate 32. I do. The electric motor 35 is driven at the same time when the document P is pressed by the pressing plate 364, and the forward feed roller 34 and the paper feed roller 40 are driven to rotate in the directions indicated by arrows in FIG. The rotation of the forward feed roller 34 in the direction indicated by the arrow in FIG. 2 causes a contact between the outer peripheral surface of the forward feed roller 34 and the lower surface of the lowermost document of the document layer inserted on the guide plate 32. The original is sent out by the frictional conveyance force. At this time, the originals on the original layer are moved in the transport direction due to friction between each other, but a small number (1 to 3) of the originals are transported downstream by being regulated by the front separating means 60.
[0024]
As described above, when the number of originals is controlled to a small number (1 to 3) by the action of the pre-separation means 60, only the lowermost originals pass through the feed roller 32 and the separation roller 51 of the original separation mechanism 50. The document is separated and transported to the document carrying path 80. Then, the front end of the document conveyed to the document carry-in path 80 is brought into contact with the nip portion of the registration roller pair 82 in a non-operating state, and the primary feeding is completed.
[0025]
When the primary paper feeding is completed as described above, the registration roller pair 82 and the transport belt mechanism 70 are operated, and the trailing edge of the primary fed paper is positioned at the document setting reference position G on the transparent plate 8. Then, an exposure operation is performed.
When the exposure operation is completed, the transport belt mechanism 70 and the transport roller pair 94 of the document discharge means 90 and the discharge roller pair 96 are operated, and the document that has been exposed on the transparent plate 8 passes through the document discharge path 92 to the document discharge tray. The document 20 is discharged onto the document placing surface 201.
[0026]
【The invention's effect】
Since the automatic document feeder according to the present invention is configured as described above, the following effects can be obtained.
[0027]
That is, the belt pressing member of the transport belt mechanism is formed of a pressing plate disposed in the width direction of the endless belt and having a length corresponding to the document transport region and mounted on the bottom plate of the support frame, and the pressing plate is An edge portion of the pressing member that presses the endless belt because the curved portion protrudes toward the endless belt and is configured to press the endless belt because the edge portion exists in the document conveying area because the curved portion presses the endless belt. Thus, it is possible to prevent the endless belt from being stained. Further, since the belt pressing member is formed of a pressing plate, it can be manufactured lightly and inexpensively.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state in which a preferred embodiment of an automatic document feeder configured according to the present invention is mounted on an electrostatic copying machine.
FIG. 2 is a schematic sectional view of the automatic document feeder shown in FIG.
FIG. 3 is a sectional view showing a first embodiment of a transport belt mechanism provided in the automatic document transport apparatus shown in FIGS. 1 and 2;
FIG. 4 is an essential part perspective view showing a second embodiment of a transport belt mechanism provided in the automatic document transport apparatus shown in FIGS. 1 and 2;
FIG. 5 is an essential part perspective view showing a third embodiment of a transport belt mechanism provided in the automatic document transport apparatus shown in FIGS. 1 and 2;
FIG. 6 is an essential part perspective view showing a fourth embodiment of a transport belt mechanism provided in the automatic document transport apparatus shown in FIGS. 1 and 2;
[Explanation of symbols]
2: Electrostatic copying machine 4: Automatic document feeder 6: Housing of electrostatic copying machine 8: Transparent plate 10: Document restricting member 18: Document placing means 20: Document discharge tray 22: Document table 30: Forward feed means 32 : Guide plate 34: forward feed roller 35: electric motor 36: pressing mechanism 362: rotating shaft 364 of pressing mechanism: pressing plate 38 of pressing mechanism: support substrate 40: feed roller 42: rotation of feed roller Axis 44: cylindrical portion of paper feed roller 46: roller portion of paper feed roller 50: document separation mechanism 51: separation roller 60: front separation means 64: support plate 66 of front separation means: front separation plate 70: transport belt mechanism 71: Support frame body of transport belt mechanism 72: Drive roller 73 of transport belt mechanism: Driven roller 74 of transport belt mechanism: Endless belt 75 of transport belt mechanism: Belt pressing member 75 of transport belt mechanism: Press plate 752: Press 753: pressure plate 754: pressing plate 76: the document feed path 77: double-sided adhesive tape 80: document introduction passage 82: a pair of registration rollers 90: document discharge means 92: the document delivery passage 94: transport roller pair 96: discharge roller pair

Claims (5)

In an automatic document feeder having a transport belt mechanism for transporting a document along a document transport path formed on a transparent plate of a document processor,
The transport belt mechanism includes a support frame, a driving roller and a driven roller disposed in parallel with the support frame at an interval in the transport direction, and winding the drive roller, the driven roller, and the support frame. A hung endless belt, and a belt pressing member disposed between the driving roller and the driven roller to press the endless belt toward the transparent plate,
The belt pressing member includes a pressing plate disposed in the width direction of the endless belt, having a length corresponding to the document conveying area, and mounted on a bottom plate of the support frame,
The pressing plate is made of a sheet member having elasticity, and has a curved portion protruding toward the endless belt, the curved portion is formed so as to press the endless belt, and both sides in the moving direction of the endless belt are formed. Affixed to the lower surface of the bottom plate by a double-sided adhesive tape or an adhesive,
An automatic document feeder, characterized in that: In an automatic document feeder having a transport belt mechanism for transporting a document along a document transport path formed on a transparent plate of a document processor,
The transport belt mechanism includes a support frame, a drive roller and a driven roller disposed in parallel with the support frame at an interval in the transport direction, and wound around the drive roller, the driven roller, and the support frame. A hung endless belt, and a belt pressing member disposed between the driving roller and the driven roller and pressing the endless belt toward the transparent plate,
The belt pressing member includes a pressing plate disposed in the width direction of the endless belt, having a length corresponding to the document conveying area, and mounted on a bottom plate of the support frame,
The pressing plate is made of a sheet member having elasticity, and has a curved portion protruding toward the endless belt, the curved portion is formed so as to press the endless belt, and both sides in the moving direction of the endless belt are formed. Being engaged with a plurality of locking claws provided on the bottom plate,
An automatic document feeder, characterized in that: In an automatic document feeder having a transport belt mechanism for transporting a document along a document transport path formed on a transparent plate of a document processor,
The transport belt mechanism includes a support frame, a drive roller and a driven roller disposed in parallel with the support frame at an interval in the transport direction, and wound around the drive roller, the driven roller, and the support frame. A hung endless belt, and a belt pressing member disposed between the driving roller and the driven roller and pressing the endless belt toward the transparent plate,
The belt pressing member includes a pressing plate disposed in the width direction of the endless belt, having a length corresponding to the document conveying area, and mounted on a bottom plate of the support frame,
The pressing plate is formed of a plate material having elasticity, includes a curved portion protruding toward the endless belt, the curved portion is formed so as to press the endless belt, and both sides in the moving direction of the endless belt are formed. Being engaged with a plurality of locking claws provided on the bottom plate,
An automatic document feeder, characterized in that: A plurality of supporting portions are provided at both sides of the pressing plate in the moving direction of the endless belt at intervals, and the supporting portions are engaged with the plurality of locking claws. Item 4. The automatic document feeder according to Item 3 . In an automatic document feeder having a transport belt mechanism for transporting a document along a document transport path formed on a transparent plate of a document processor,
The transport belt mechanism includes a support frame, a driving roller and a driven roller disposed in parallel with the support frame at an interval in the transport direction, and winding the drive roller, the driven roller, and the support frame. A hung endless belt, and a belt pressing member disposed between the driving roller and the driven roller to press the endless belt toward the transparent plate,
The belt pressing member includes a pressing plate disposed in the width direction of the endless belt, having a length corresponding to the document conveying area, and mounted on a bottom plate of the support frame,
Pressing plate is formed of a synthetic resin material, the curved portion includes a curved portion protruding endless belt side is formed so as to press the endless belt, each of the moving direction side portions of the endless belt spacing A plurality of supporting portions are provided, and the plurality of supporting portions are elastically supported by coil springs having both ends engaged with the bottom plate, respectively.
An automatic document feeder, characterized in that:

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