JP2851956B2 - Sheet document feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet document feeder, and more particularly, to a copying machine for reading information of a sheet document, for example.
The present invention relates to a sheet document loading / unloading device in a document reading device such as a facsimile or an image scanner.

[0002]

2. Description of the Related Art Conventionally, as a device for separating, carrying in, and transporting a sheet document of this kind from a stacking unit to a reading unit, and discharging the same outside the apparatus after reading is completed, sheet paper is provided upstream and downstream of the reading unit. In many cases, two or more pairs of independent transport rollers for transporting the paper while transferring are provided. Further upstream of these arrangements, there is a pick-up roll for supplying the stacked sheets and a separating function for feeding the sheets one by one to the reading section. In addition, on the downstream side, there is a stackable tray unit for receiving sheet paper.

[0003]

However, in the above-mentioned conventional example, each sheet loading tray table is required before and after the reading section, and it protrudes from the floor area of the main body. In addition, a large number of parts are required for connection and control of drive to a large number of transport rolls and distant rolls.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, there is provided a single rotating transport roll and a member which is in contact with a distant and opposite position on the outer peripheral surface of the roll. , One of which comes into contact with the transport roll is a transport unit for loading the sheet into the reading unit, and the other is a transport unit for discharging the sheet after reading.

[0005] From the sheet document stacking section adjacent to the transport roll, the sheet roll is supplied to the transport roll section by rotation of a supply roll, and the sheet paper is separated one by one at a carry-in tangent portion of the transport roll and guided to a reading section. After the image information on the original sheet is read, a path having a necessary curvature for making a U-turn of the sheet paper is provided, and the path is guided to a discharge driven section at a position opposite to the rotating transport roll, and a tangential line is formed. , And discharges the trailing edge of the sheet paper onto the upper surface of the discharge receiving tray.

The means for feeding a document sheet by a single transport roll imparts one-way drive rotation to the transport roll, transmits rotation transmission drive in the same direction from the transport roll shaft to the sheet paper supply roll, and transfers the sheet on the sheet document stacking section. In the downstream direction. If the contact section for carrying in the sheet is pressed against the transport roll with a wear-resistant rubber sheet or the like, which is usually called friction piece separation, even if multiple sheet papers are transported to the tangential section, they are separated. Only one sheet document passes through the tangent portion and is sent to the reading unit by the outer peripheral rotation of the transport roll.

An independent driven roll may be provided adjacent to the reading section. The discharge of the sheet is completed when the sheet paper after the U-turn has passed the trailing edge of the driven roll tangent portion, and the rear portion of the sheet has a height (loading allowance) space that can be stacked on the tray. Below.

[0008] The supply roll and the connecting drive unit leading to the supply roll are configured to escape from a necessary area for discharging and stacking sheets, and are not obstructed to the transfer of the sheet when guiding the sheet to the separation unit. Meets.

Further, in order to relieve the trouble of conveyance in the conveyance path leading to the conveyance and discharge of the sheet paper, the functional parts which assist in the conveyance and discharge in contact with the outer periphery of the conveyance roll are separated from the outer periphery of the conveyance roll. There is also a means for opening the sheet paper effectively.

The total height space between the sheet original stacking space and the sheet discharge function is an important space for changing the direction of the sheet, and is important in setting the radius of curvature for determining the U-turn of the sheet. A single transport sheet is transported to the image reading unit on one of the outer peripheral surfaces of the rotating transport roll, and a double transport effect of transporting the original sheet in the return direction on the other outer peripheral surface.

[0011] A sheet document is carried into the reading section on the upper surface of the transport roll, guided in a return direction on the lower surface side of the roll, and guided on a paper discharge table. It can be implemented in any of the two ways of discharging.

In the latter case, if the arrangement of the sheet document loading table is inclined, the upper surface of the loading table or the upper surface of the stacked sheets is located on the side of the sheet loading section away from the transport roll. However, it has a double effect that can be shared as a receiving tray for sheet documents discharged as it is.

[0013] In the event of failure in the loading and discharging of sheet paper and the opening in the paper path for the purpose of facilitating the removal processing of unsent sheet paper, the discharge stacking table adjacent to the transport roll is moved. If the movable member is made movable around the conveying roller rotating bearing, the contact member located on the opposite side of the rotating conveying roller is opened, and the uneven cam portion added to the outer peripheral portion of the sheet discharge stacking table holding portion is moved. In conjunction with this, the contact member can be easily separated from the outer peripheral surface of the transport roll, and there is also an effect that a configuration in which an independent release mechanism is not required can be realized. With these functions, the supply roll and reading roll can be arranged close to each other with the rotating transport roll as the center, eliminating the need to disperse the drive mechanism, enabling centralized arrangement, and using a simplified configuration. Required functions can be collected in a small frame.

[0014] The drive for rotation can be easily transmitted from one place, and the transmission to the supply roll can be easily formed by directly connecting the gears with a gear, and an arm for holding the gear and the supply roll can be easily formed. Configuration is possible in pairs.

The arm pair exposes only a part of the outer peripheral surface of the supply roll which needs to be supplied in contact with the sheet paper, and the gears are built in the arm in order to protect the sheet from being carried in and out. Further, the arm member can also serve as a sheet paper guiding function. As a result, the sheet stacking margin can be secured, and the trailing edge of the sheet paper dropped on the tray is protected from the outer periphery of the transport roll. There is no need to provide a separate discharge roll pair, and it can be configured with a small number of parts, achieving a multifunctional effect.

In order to read the image at a high peripheral speed and a high-definition image, it is necessary to prevent variations in the accuracy of the diameters of the respective rolls. In the example, in loading and unloading a single sheet, a factor that produces image quality resulting from a speed difference is removed.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

Reference numeral 1 denotes a basic frame, in which a sheet paper stacking unit, a loading unit reading unit, a discharging unit, and a discharge receiving table, which are integrally formed in the left and right side plates 2 and 3, are incorporated.

Reference numeral 11 denotes a bottom of the frame 1, which serves as a sheet paper loading table. A sheet S as a sheet document is stacked thereon, and a roll 6 for supplying the sheet to the transport roll 5 is placed on the uppermost surface of the sheet S by its own weight or light pressure. The main transport roll 5 is fixed on a rotatable shaft 51 that is supported by the side plates 2 and 3. Numeral 52 is a partial roller which is fixed at a constant interval in the axial direction, has the same outer diameter as the transport roll 5, and is rotatable together with the shaft 51. On the shaft 51, there are provided a pair of arms 7a and 7b which are rotatably supported by the shaft. The arms 7a and 7b hold the supply roll 6 in a rotatable manner. Built-in. 8 is a holding shaft of the supply roll, 9 is a connecting gear for transmitting rotation to the supply roll 6, and 10 is an idler gear rotatable on an idler shaft 7a 'on the arm 7a. The gear 10 meshes with a gear 11 connected to a transport drive shaft 51, and
1. With the rotation of the transport roller 5, a rotation drive in the same direction is transmitted to the supply roll 6 described above.

These gears are incorporated in the arm 7a, and only a part of the outer periphery 6a of the supply roll 6 protrudes from the outside of the arm bottom surface 7a "and is in contact with the sheet paper to be carried in.

A separation roll 13 for separating sheet paper is assembled on the shaft 12 located below the transfer roll 5 in a pressure-contact state with the transfer roll 5, and the shaft 12 is separated from the shaft 12 through a spring clutch called a torque limiter (not shown). The rotation force is transmitted to the separation roll 13. The separation roll 13 rotates in the same direction as the transport roll 5 and performs a separation action of rotating a plurality of sheet papers conveyed to the tangential portions of both rolls in the return direction so that only one sheet of paper can pass. Let

Reference numeral 15 denotes a reading roll, which extends over the entire effective width of the sheet, and makes the outer peripheral surface white so that image information on a transparent base sheet document can be read.

Small holding arm 1 rotatable on separation shaft 12
A driven roller 17 is rotatably mounted on the arm 16, and a plurality of rollers are pressurized by a spring 18 so that the roller 17 can be pressed against the reading roll 15. The pressing means causes one end of the spring 18 to abut on the lower part of the paper loading base, and the other end thereof is wound in a coil shape around the outer periphery of the shaft 12 and then pushes the lower end of the small holding arm upward. Being energized. One sheet original conveyed by the transport roll 5 enters a tangential portion with the driven roller 17 by the rotation of the reading roll 15, and the reading unit 20 reads image information. Light from the light source L illuminated through the translucent material 21 is reflected on a document surface passing between the reading roll 15 and the translucent material 21 to optically image the reflected light, Read the image information with the photo sensor. The paper whose path has been changed by the guide members 22 and 23 that transport the read sheet paper is guided to the upper outer peripheral surface of the transport rolls 5 and 52. There is a shaft 24 positioned parallel to the transport roll shaft 51, and the rollers 25 that can idle on the shaft are transport rollers 5, 52.
The shaft 24 is pressurized by a spring 26 so as to rotate following the rotation of the shaft 24.

The above-mentioned advancing sheet paper is transported by rolls 5,5.
It is guided to a tangential portion formed by the second roller 25 and the driven roller 25, and is discharged in the discharge direction.

The transport roll shaft 51 and the paper discharge shaft 24 are vertically movable in the long grooves 23a formed in the side plates 2 and 3.

A gear (not shown) mounted on the transport roller shaft 51 meshes with a gear on the reading roll shaft via an idler gear 28 which can idle on the main body stay shaft 27, and rotates the transport roll shaft. Read force roll 15
To rotate the sheet paper in the direction of transporting the sheet paper to the downstream side. The outer peripheral speed of the transport roll and the outer peripheral speed of the reading roll are set to be the same, and the transport speed of the sheet paper at the reading unit is the same as the loading and unloading speed of the transport roll. During the period from the loading to the discharging, a stable feed without image disturbance is guaranteed.

Reference numeral 30 denotes a discharge sheet receiving table, the other end of which is rotatably mounted on the outer periphery of the transport roll bearing 31, and is mounted so as to be positioned in the illustrated position. The plurality of ribs 301 on the lower surface of the receiving table have a guiding function when the sheet paper is set on the loading table.

The discharge sheet receiving table 30 is configured to be located below a predetermined distance away from a tangent line which is in contact with the transport rolls 5, 52 and the roller 25. The pair of arms 7a and 7b holding the supply roll 6 are also composed of arms having a diameter smaller than the diameter of the transport roll 5, and the connection gears 11, 10 and 9 reaching the supply roll 6 are also provided inside the arm. .

According to this configuration, the sheet paper can be rotated under the condition that the tip of the idler gear escapes from the conveyance path 7a '"in which the leading end of the sheet paper is guided to the tangential portion of the conveyance roll 5, and does not hinder the advancement of the sheet. The upper surface of the arm 7a is located below the upper surface of the paper stack of the discharge tray 30 and the idler gear 10 is built in 7a to enable the rotation transmission drive to the supply roll 6, so that the paper to the discharge tray 30 is The tray section with a fixed loading margin was made possible without obstructing the discharge.

Adjacent to the driven discharge roller 25, a discharge shaft 24
It is rotatable above. Finger 32 is under its own weight,
Lower than the roll tangent. When the sheet paper is discharged, the leading end is lifted by the sheet paper to the tangential position, and performs an auxiliary function of reliably dropping the final trailing edge into the stacking space at the rear of the tray. Further, a stopper 302 for protecting the trailing edge of the sheet paper from being caught in the transport roll 5 is provided on the sheet receiving tray adjacent to the roller 52.

S in FIG. 2 is a stacked sheet of paper,
The sheet is conveyed in the downstream direction by the supply roll 6 and separated by the separation unit. The conveyance roll carries one sheet of paper, passes through the reading unit, changes the course by the guide plate, and receives the sheet at the discharge unit. It is discharged to the table. P1 indicated by a two-dot broken line is a diagram in which one sheet of paper is reliably discharged onto the receiving table.

The sheet paper stacking table has an inclined configuration as shown in the figure, and the sheet sheet being discharged advances on the sheet discharge receiving table, and the front end of the sheet paper advanced from the table surface is the inclined table or the top of the remaining stack. While touching the paper, it rises slowly,
The trailing edge of the sheet paper at the end of discharging is stopped by the stopper portion 30 of the receiving stand.
2, and the originals that have been sequentially read are stacked.

FIG. 3 is a view showing the open state of the paper path in the present invention from the embodiment of FIG.
Is rotated from the normal use position in the direction indicated by the arrow.

The side plates 2 and 3 have a bearing 31 for holding a main transport shaft 51 and a groove 3 in which the paper discharge shaft 24 can move vertically.
06 is formed, and the main transport rolls 5,
The driven roller 25 is pressurized by the spring 26 with a pressing force required for the roller 52. By the operation of releasing the sheet path (arrow A), the sheet receiving tray 30 rotates counterclockwise on the transport roll bearing 31, and the projections 303 and 304 having a convex shape are displaced in the same direction. 304 presses down the bearing 33, and the contact between the transport roll 5 and the separation roll 13 is released, so that an interval is generated.

Further, the upper convex portion 303 pushes the shaft 24 upward, and similarly, a space is generated between the transport rolls 5 and 52 and the driven roller 25. The other contacting the transport shaft may be released. As described above, there is an effect that an independent release mechanism is not required.

As described above, according to the embodiment of the present invention, the sheet paper having the image information loaded on the loading table is carried one by one into the apparatus having the reading section, and after the reading, the U-turn is performed. In a device that discharges the same sheet paper onto the opposite outer circumference of a single main transport roll that rotates in one direction, the same sheet paper can be loaded and discharged, and the sheet paper can be discharged from the loading position. A reading unit for reading image information is provided in parallel in an intermediate process of discharging.

Since a reading roll section arranged near the main transport roll in the reading section is constituted together with a driven member, the gear on the main transport roll axis is rotated directly via the idler gear to the gear on the reading roll axis. Can communicate
Transfer of the sheet paper to carry-in, reading, and discharging has the effect of enabling high-resolution reading without uneven feeding. Also, by making the radius of curvature necessary for making a U-turn of the sheet paper adjacent to the main transport roll, the flow of the original document sheet can be made smoother and the path length of the sheet paper in the apparatus can be set to the shortest. Has a highly reliable effect.

The carrying-in and carrying-out auxiliary members can be made only by pressing against the planar member, and the effect can be sufficiently exerted by a rollable driven member. In addition, the rotation of the separation roll, which employs a retard roll for separating the sheet paper from the stacking section, is rotated from the gear on the main transport roll shaft to the gear on the separation roll drive shaft via the idler gear. It has the effect of a simple configuration that can be transmitted.

Normally, in the case of friction piece separation, which is widely used, all of the above-described retard separation mechanism components are not required, and only the separation piece needs to be brought into direct contact with the transport roll.

Further, the supply roller is rotated in the carrying-in direction by a gear meshing with an idler gear provided inside a swingable arm from the gear on the carrying roll shaft, to separate and carry in the loaded sheet paper. There is also an effect that the roll can be supplied with a simple configuration.

The discharge tray, which is retracted from the tangential direction (the traveling direction of the discharged sheet) formed by the transport roll and the driven discharge roll to form a stacking margin necessary for discharge, is also provided.
This has the effect that it can be configured around the transport shaft.

Further, the holding arm of the supply roll can also be swung coaxially, and has an effect of enabling a form which does not hinder the stacking allowance of the sheet receiving tray.

From the loading table, sheet documents are separated and carried one by one by a supply roll, and the U-turned sheet paper is read by a linear transport parallel to the main transport roll axis, and the shortest path of the sheet paper is performed by the same transport roll. Since the loading and the reading and discharging of the sheet are completed, the skew, the transport unevenness, and the transport trouble, which are likely to occur when the sheet paper is transported, are released, and there is an effect that a high-resolution reading device can be obtained.

The paper receiving tray can also remove the sheet paper when it stays by a slight rotation in the opening direction on the transport roll bearing.

Further, the sheet paper loading table also serves as a sheet receiving tray after reading.

[0046]

As described above, since the path length of the sheet paper is configured around the main transport roll, it is possible to carry in and discharge the sheet paper while maintaining high reliability. The remarkable effect of reducing the number of parts can be achieved. As other effects brought by these, it has become possible to provide a significantly inexpensive device as well as a reduction in size, thickness, and weight.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a reading apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which an upper cover is removed.

FIG. 3 is a front sectional view schematically showing a discharge unit.

[Explanation of symbols]

 Reference Signs List 1 frame 11 loading table 6 supply roll 5 transport roll 13 partial roll 15 reading roll 22, 23 guide guide 25 discharge roller 30 discharge tray

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65H 5/06 B65H 3/06 340 B65H 15/00 B65H 29/22 G03G 15/00 107

Claims (1)

(57) [Claims] 1. A loading table for storing a sheet document, a supply roll for feeding the sheet document of the loading table, a transport roll for transporting the fed sheet document, and a sheet document in contact with the transport roll. Separating means for separating the conveyed sheet document, a guide means for U-turning the conveyed sheet document, a reading roll for guiding the sheet document conveyed by the conveying roll at a reading position, and a U-turn in contact with the conveying roll. A sheet document feeder, comprising: a discharge roll that discharges the sheet document that has been fed; and a transmission unit that transmits the rotational force of the transport roll to the supply roll and the reading roll.