JP2912794B2 - Reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reading device for reading and transmitting image information of a document, and more particularly to an improvement in a driving mechanism for feeding and conveying a document.

[0002]

2. Description of the Related Art In recent years, in this type of reading apparatus, when an original is fed, an original feed roller is provided in addition to a feed roller to feed the original. The introduction roller is a roller that pushes out the original loaded on the original platen to the paper feed roller,
It is an elliptical roller. When a large number of originals are stacked on the platen, the travel path to the paper feed roller becomes narrower toward the paper feed roller. In some cases, the leading edge of the gripped document does not reach the paper feed roller. The introduction roller is
It is provided on the upstream side of the document feed direction from the paper feed roller, and even when a large number of documents are stuck in the middle of the traveling path, it rotates at the lowermost layer of the document bundle, and the document is formed in an elliptical shape. By extruding from the lower layer of the bundle, the bundle of aligned documents is broken and the documents are advanced to the paper feed roller. Since the introduction roller does not separate the originals one by one, a plurality of originals may reach the feed roller.

When a document arrives at the paper feed roller, a separation piece in contact with the peripheral surface of the paper feed roller presses the upper surface of a plurality of originals to restrict advance, and the paper feed roller rotates at the lower surface of the plurality of originals. As a result, only the lowermost document of the plurality of documents is fed out and fed one by one.

When a document is fed, the introduction roller and the feed roller stop rotating until the next document is fed and are on standby. At this time, since the shape of the introduction roller is elliptical, it is necessary to stop it with the flat surface facing upward so as not to hinder the feeding of the next original.

Conventionally, a projection is provided on a rotation shaft of an introduction roller, and an arm of a solenoid comes into contact with the projection, and a sensor O for detecting whether a document is fed or not is provided.
ON and OFF of solenoid arm corresponding to N and OFF
By controlling the rotation of the rotation shaft of the introduction roller in F, control for electrically stopping the introduction roller with the flat surface thereof facing upward has been performed.

[0006]

However, in the above-mentioned conventional configuration, when the rotation of the introduction roller is stopped, the stop position of the introduction roller is electrically controlled. And the circuit configuration becomes complicated.

As a technique for solving this problem, Japanese Patent Laid-Open No.
There is a technique disclosed in Japanese Patent Application Laid-Open No. 4-243735.
That is, a configuration in which a protrusion is provided on the rotation shaft of the introduction roller, a contact portion of a rotatable stopper member is brought into contact with the protrusion, and the contact portion is released from contact with the protrusion by switching the rotation direction of the motor. And With this configuration, when the motor rotates in the reverse direction, the stopper member is reversed to separate the contact portion from the protrusion, and when the motor rotates in the forward direction, the stopper member rotates again in the direction in which the contact portion contacts the rotation shaft of the introduction roller. Let me. When the motor is rotated forward, the introduction roller rotates to feed out the document. When the rotation shaft of the introduction roller makes one rotation and the projection comes into contact with the contact portion, the introduction roller stops with the carrier surface facing upward.

Certainly, according to the above-described technique, the stop position control of the introduction roller is performed not by the electric control using the solenoid but by the control of the forward / reverse rotation of the motor.
The circuit configuration can be simplified. However, if the feeding of the original by the introduction roller is not performed smoothly, the rotation of the introduction roller makes one rotation, the contact portion of the stopper member and the projection come into contact, and the rotation of the introduction roller stops. There is a problem that the paper is not fed out and stopped without reaching the paper roller. Further, when the guide roller is further rotated to feed out the document, the rotation of the normally rotated motor must be reversed again to release the contact between the contact portion and the projection and rotate the guide roller. Did not. In this case, when the motor rotates in the reverse direction, the introduction roller stops, so that the original advances or stops during the operation of feeding one original. Since the paper feeding is not smooth, there is a possibility that the user may be misunderstood that the apparatus has failed. Therefore,
It was difficult to say that the above-described technique had the same effect as the control performed by providing the electric control circuit.

Further, since the transport roller for transporting the fed document past the reading point is rotated by the same motor as the introduction roller and the feed roller, the transport roller also rotates in the transport direction when the motor rotates in the reverse direction. The document cannot be conveyed until the rotation direction of the motor is switched to the normal direction, and the reading operation of a plurality of documents at a high speed cannot be performed. .

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problem, in which control is performed to stop the introduction roller with the flat surface facing upward only by controlling the forward / reverse rotation of the motor, and to temporarily stop the feeding operation of one document. Therefore, the present invention realizes a reading device that can be executed smoothly.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a drive motor capable of rotating forward and backward, a feed roller for separating and feeding originals one by one together with a separating piece, and a feed roller. An introductory roller with an irregularly shaped outer periphery for feeding the document intermittently to the roller, and a circumferential width provided on the rotating shaft of the introductory roller
An introducing roller gear having a notch in a part of the conveying roller and the document feeding direction the conveying roller in both the forward rotation time and reverse rotation of the drive motor for conveying passes the reading point of the document fed A first transmission means having a first planetary gear for rotating the guide roller gear, and rotating the introduction roller by meshing with an arc portion other than the notch portion of the introduction roller gear, reaching the notch portion, and then rotating the introduction roller, and then rotating the introduction roller at a width not greater than the width of the notch portion. Circumference
An intermediate gear having the same configuration as described above, and wherein the feed roller and the introduction roller are always engaged with the gear of the paper supply roller and the introduction roller gear when the drive motor rotates normally, and the paper supply roller is rotated in the reverse rotation. The notch portion which is separated from the gear and the introduction roller gear and meshes with the intermediate gear.
And a second transmission means having a second planetary gear having a circumferential width greater than the width of the second planetary gear.

Further, a drive motor capable of rotating forward and reverse, an introduction roller having an irregularly shaped outer periphery for intermittently feeding an original to a paper supply roller, and a part of a circumferential width provided on a rotation shaft of the introduction roller.
The introduction roller gear having a notch portion, and the notch portion that engages with an arc portion that is not the notch portion of the introduction roller gear, rotates the introduction roller, reaches the notch portion, and idles after reaching the notch portion.
An intermediate gear with the following circumferential width wide, by rotating the introduction rollers the drive motor is engaged said introduction roller gear directly to the forward rotation, the intermediate meshes with the intermediate gear spaced apart from the inlet roller gear during reverse rotation Rotate the gear
And a planetary gear having a circumferential width larger than the width of the notch .

[0013]

[0014]

[0015]

According to the present invention, when the drive motor is rotated in the normal direction, the transport roller is rotated by the first planetary gear, and the paper feed roller is rotated by the second planetary gear to start the original feeding operation. . When the document is fed, the drive motor switches the rotation in the reverse direction, and the second planetary gear is separated from the gear of the feed roller and the gear of the introduction roller. Only rotation continues. The introduction roller rotates via the intermediate gear even when the second planetary gear is separated from the gear of the introduction roller. However, the gear of the introduction roller
Is provided with a notch in a part of the circumferential width, so that when an intermediate gear having a width equal to or less than the width of the notch enters the notch , it does not mesh with the introduction roller gear and the rotation of the introduction roller stops. . The position of the cut-out portion of the introduction roller gear is provided so that when the introduction roller stops, the flat surface faces upward and stops.

Thus, when the original is fed to the paper feed roller using the guide roller having an irregular outer periphery, the guide roller can be stopped with the flat surface facing upward only by switching the rotation direction of the drive motor. Therefore, there is no need to provide an electric control circuit, and the circuit configuration can be simplified.

Further, since the introduction roller continues to rotate while the drive motor rotates in the normal rotation direction, even if the feeding of the original does not take time and does not proceed smoothly, the repetition of the original in the feeding operation of one original is performed. Is not stopped,
There is no danger of giving the user anxiety about the device.

Further, regardless of the rotation direction of the drive motor, the transport rollers rotate in the document transport direction, so that the next document can be fed without waiting for the previous document to be transported.

[0019]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a sheet feeder in the reading apparatus of the present invention.
FIG. 3 is a perspective view illustrating an appearance of a reading unit provided with a transport mechanism.

FIG. 2 is an enlarged perspective view showing a main part of a paper feeding and conveying mechanism in the reading apparatus according to one embodiment of the present invention. FIG. FIG. FIGS. 4 and 5 are cross-sectional views showing a state in which the document is fed by the paper feeding and conveying mechanism.
FIG. 3 is a cross-sectional view showing a state in which the paper feeding and conveyance mechanism conveys a document.

In FIG. 1 to FIG. 7, reference numeral 1 denotes a reading apparatus provided with a paper feeding and conveying mechanism according to the present embodiment. Reference numeral 2 denotes an A point sensor, which detects the presence or absence of a document and detects the size of the document when a document is present. Reference numeral 3 denotes an introduction roller, which feeds out the original and causes the original to reach the feed roller 4 even when the leading end of the original set on the original table does not reach the feed roller 4. Reference numeral 4 denotes a paper feed roller, which separates the original fed by the introduction roller 3 one by one together with a separation piece and feeds it to a reading point. Reference numeral 5 denotes a B point sensor, which detects whether a document is fed. 6 is an open / close sensor that projects obliquely outward from the inside of the device 1 and detects whether the open / close unit 9 is in the open position or the closed position. Reference numerals 7 and 8 denote a transport roller a and a transport roller b, which transport the document fed by the feed roller 4 through the reading point. Reference numeral 9 denotes an opening / closing unit, which is provided rotatably. The operator opens the opening / closing section 9 when the document is jammed to open the document conveyance path and removes the jammed document. Reference numeral 10 denotes a motor, which can rotate forward and backward. Reference numeral 11 denotes a motor gear, which transmits the rotation of the motor 10 to another gear.
Reference numerals 12 and 13 denote planetary gears a and planetary gears b, whose rotation shafts move in accordance with the direction of rotation to be applied, and change the object to which the rotation is transmitted. When the planetary gear a12 and the planetary gear b13 move, a long hole is provided as a guide, and a rotating shaft is fitted into the long hole, and moves along the long hole.
Reference numerals 14 and 15 denote an intermediate gear a and an intermediate gear b. The intermediate gear a14 transmits the rotation of the motor 10 to another gear, and the intermediate gear b15 receives rotation from the intermediate gear a14 and receives planetary gear a1.
2 to transmit the rotation. A gear shaft 16 has an intermediate gear b15 at one end and an intermediate gear c17 at the other end. Reference numeral 18 denotes an introduction roller gear, which is provided on a shaft of the introduction roller 3. A notch is partially provided on the surface of the introduction roller gear 18 in a size less than the entire width. Reference numeral 19 denotes an intermediate gear d which receives rotation from the planetary gear a12 and transmits the rotation to the introduction roller 18. The size of the notch of the introduction roller gear 18 is determined according to the arc of the intermediate gear d19. Reference numeral 20 denotes a paper feed roller gear provided on a rotation shaft of the paper feed roller 4, and rotates by receiving rotation transmitted from a planetary gear a12.

Reference numeral 21 denotes an intermediate gear e. When the motor 10 rotates in the forward direction, the planetary gear b13 moves along the elongated hole and receives rotation when it reaches one end of the elongated hole. Further, the intermediate gear e21 transmits the rotation to the intermediate gear f22 and the conveying roller a gear 23. When the motor 10 rotates in the reverse direction, the planetary gear b13 moves through the long hole in the reverse direction, and when reaching the other end, transmits the rotation to the intermediate gear f22. Further, the intermediate gear f22 rotates the intermediate gear e21.
, And the intermediate gear e21 transmits the rotation to the conveying roller a gear 23. The conveyance roller a7 rotates via the rotation shaft 24 by the rotation of the conveyance roller a gear 23. Reference numeral 25 denotes a conveyance roller b gear, which rotates by receiving rotation from the intermediate gear f22, and rotates the conveyance roller b8 via a rotation shaft 26. Reference numerals 27 and 28 denote a pinch roller a and a pinch roller b, which are provided to face the transport roller a7 and the transport roller b8, respectively. Reference numerals 29 and 30 denote a coil spring a and a coil spring b which are fitted to the shaft portions of the planetary gears a and b.

Hereinafter, the operation of the reading apparatus of the present invention configured as described above will be described.

First, a document is set on a document table. When the point A sensor 2 detects the presence of a document, the motor starts transmitting rotation in the forward direction. On the side of the device 1, as shown in FIG.
14, the intermediate gear a14 transmits the rotation to the planetary gear b13. The planetary gear b13 moves in the direction of arrow A when the motor 10 rotates in the forward direction. Planetary gear b13
First transmits the rotation to the intermediate gear e21, and then transmits the rotation to the intermediate gear e21.
21, an intermediate gear f22 and a conveying roller a gear 23
The rotation is transmitted to. Further, the rotation transmitted to the intermediate gear f22 is transmitted to the gear 25 for the conveying roller b. Thus, the conveying roller a gear 23 and the conveying roller b gear 25 rotate, and the conveying roller a7 and the conveying roller b8 rotate in the document conveying direction.

On the center side of the apparatus 1, as shown in FIG. 5, first, when the intermediate gear b15 on the side surface receives the rotation of the motor 10 through the intermediate gear a14, the rotation of the rotary shaft 16 is performed. The intermediate gear c17 rotates. Next, the intermediate gear c17 transmits the rotation to the planetary gear a12, and the planetary gear a1
2 moves in the direction of arrow B. Further, the planet gear a12 transmits the rotation to the introduction roller gear 18 and the paper feed roller gear 20. As a result, the introduction roller 3 and the paper supply roller 4 rotate, so that the document set on the document table is transported to the paper supply roller 4 by the introduction roller 3, and when the leading end of the document reaches the paper supply roller 4, The document is fed by the rotation of the roller 4 and the advance of the documents other than the bottommost document is regulated by a separating piece (not shown), and the documents are fed one by one. At this time, the introduction roller 3 continues to rotate without any restriction while the motor 10 rotates in the normal rotation direction. Therefore, even if the document is not fed by one rotation of the introduction roller 3, the introduction roller 3 continues to rotate, so that the document is smoothly fed by the introduction roller 3.

When a document is fed and the leading edge of the document reaches the B point sensor 5 in FIG. 1, the B point sensor 5 detects that the document has been fed. When the B point sensor 5 detects the leading edge of the document and conveys the document for a predetermined time or a predetermined amount, the rotation direction of the motor 10 switches from the forward direction to the reverse direction.

When the motor 10 rotates in the reverse direction, the rotation of the motor 10 is first transmitted from the motor gear 11 to the intermediate gear a14 on the side of the apparatus 1, as shown in FIG.
Next, the rotation of the intermediate gear a14 is transmitted to the planetary gear b13, and the planetary gear b13 moves in the direction of arrow C. The rotation of the planet gear b13 is transmitted to the intermediate gear f22, and the rotation of the intermediate gear f22 is transmitted to the intermediate gear e21 and the conveying roller b gear 25. Further, the rotation of the intermediate gear e21 is transmitted to the conveying roller a gear 23. As a result, the transport roller a7 and the transport roller b8 rotate. At this time, the rotation direction of the motor 10 is reversed, but the transport roller a7 and the transport roller b8 continue to rotate in the same direction. In other words, the movement of the planetary gear b13 changes the object to transmit the rotation from the intermediate gear e21 to the intermediate gear f22. Therefore, even if the motor 10 reverses the rotation direction, the transport rollers a7 and the transport rollers b8 move in the document transport direction. It will keep spinning. Therefore, it is not necessary to start feeding the next document until the previous document has been conveyed, and the next document can be started before the previous document is conveyed. Can be performed.

On the center side of the apparatus 1, when the motor 10 rotates in the reverse direction as shown in FIG. 7, first, the rotation of the motor 10 is transmitted from the intermediate gear a14 on the side to the intermediate gear b15. The rotation of the rotation shaft 16 of the gear b15 rotates the center intermediate gear c17. Next, receiving the rotation of the intermediate gear c17, the planetary gear a12 moves in the direction of arrow D. When the planetary gear a12 rotates and moves, the rotation is transmitted to the intermediate gear d19 and the intermediate gear d19 is transmitted.
Moves in the direction of arrow E, the intermediate gear d19 meshes with the introduction roller 3, and the introduction roller gear 18 rotates. Since the introduction roller gear 18 is provided with a notch, the teeth of the intermediate gear d19 enter the notch of the introduction roller gear 18 shortly after the introduction roller 3 rotates, and the intermediate gear d1
Numeral 9 enters the notch of the introduction roller gear 18 and idles.
Therefore, even if the intermediate gear d19 continues to rotate, the teeth of the intermediate gear d19 and the teeth of the introduction roller 3 do not mesh with each other.
The rotation is not transmitted to the introduction roller gear 18 and the introduction roller 3
Stops, and the introduction roller 3 stands by with the flat surface facing up. Thus, when the document is fed and the rotation of the motor 10 starts to rotate in the reverse direction, the introduction roller 3 stops rotating with the flat surface up, and can stand by for feeding the next document.

The fed document is transported by transport rollers a7 and b8. When the point B sensor 5 detects the trailing edge of the original, and after the detection has been performed for a predetermined time or a predetermined amount after the detection, and the point A sensor 2 detects that the next original exists, the rotation direction of the motor 10 is changed to the normal rotation direction. And the above operation is repeated again.

When the motor 10 rotates in the reverse direction,
Since the planetary gear a11 moves in the direction of arrow D as described above, there is no gear that meshes with the paper feed roller gear 19, and the rotation of the paper feed roller 4 stops. This is because, when the leading edge of the document reaches the point B sensor 5, the transport roller a7 transports the document, so that it is necessary to stop the rotation of the paper feed roller 4. That is, the rotation speed of the feed roller 4 is different from the rotation speed of the transport roller a7,
When the rotation speed of the paper feed roller 4 is higher, the original slacks between the conveyance roller a7 and the paper supply roller 4, and when the rotation speed of the paper feed roller 4 is lower, the original is pulled and conveyed to the conveyance roller a7. This prevents the roller a7 from conveying the document. Therefore, when the B point sensor 5 detects the leading edge of the document and conveys the document for a predetermined time or a predetermined amount, the rotation of the paper feed roller 4 is stopped.

As described above, according to the present invention, when an original is fed to the paper feed roller using the elliptical introduction roller 3, an electric control circuit for the solenoid is provided only by controlling the forward and reverse rotations of the motor 10. Instead, the introduction roller 3 can be stopped with the flat surface facing upward only by the combination of the gears. Also, the motor 10 rotates in the reverse direction until the document is fed, and while the motor 10 is rotating in the reverse direction, the introduction roller 3 continues to rotate, so that the document does not stop during the document feeding operation. Thus, the document is smoothly fed from the viewpoint of the user.
Further, regardless of the rotation direction of the motor 10, the transport roller 7 and the transport roller 8 rotate in the document transport direction, so that the next document can be fed even before the transport of the document is completed.

[0033]

As is apparent from the above description, the present invention provides a drive motor capable of rotating forward and backward, a feed roller for separating and feeding a document one by one together with a separation piece, and a feed roller for the feed roller. An introductory roller with an irregularly shaped outer periphery for feeding the document intermittently, and a part of the circumferential width provided on the rotating shaft of the introductory roller
An introducing roller gear having a notched portion, rotates the conveying roller in the document conveying direction in both of the conveying roller, forward rotation time and reverse rotation of the drive motor for conveying passes the reading point the document fed A first transmission means having a first planetary gear, and a circumferential width equal to or less than the width of the notch portion which rotates by rotating the introduction roller by engaging with an arc portion which is not the notch portion of the introduction roller gear and reaches the notch portion, and then idles. An intermediate gear, and the gear of the paper feed roller and the introduction roller gear are always engaged with the drive motor during normal rotation to rotate the paper supply roller and the introduction roller. A width of the notch portion which is separated from the gear and the introduction roller gear and meshes with the intermediate gear.
And a second transmission means having a second planetary gear having a large circumferential width, so that the first transmission means performs both forward rotation and reverse rotation of the drive motor.
Drive transmission is performed to rotate the transport roller in the document transport direction, and the second transmission means stops the feed roller and stops the introduction roller with the flat surface up when the drive motor rotates in the reverse direction. , The feeding operation of the next original can be started, and the reading operation speed of a plurality of originals can be increased.

Further, the present invention includes a reversible drive motor, and the introduction rollers outer periphery irregular shape unwinding the original intermittent to the feeding roller, provided on a rotating shaft of the introduction roller circumference
Before the introduction roller gear having a partially cut-out portion of the width of, from reaching the rotating cutout section of the introduction roller meshes with arcuate portions that are not cut-out portion of the introduction roller gear idles
An intermediate gear having a circumferential width equal to or less than the width of the notch , the drive motor directly meshing with the introduction roller gear during normal rotation to rotate the introduction roller, and separated from the introduction roller gear during reverse rotation to form the intermediate gear; Mesh with the intermediate gear
And a planetary gear having a circumferential width larger than the width of the notch portion for rotating the notch portion. Since the introduction roller is rotated through the intermediate gear until the intermediate gear enters, the rotation of the introduction motor and the paper feed roller can be continued or stopped by simply switching the rotation direction of the drive motor without providing an electric control circuit. Switching can be performed, and when the introduction roller is stopped, the introduction roller can always be stopped with the flat surface facing upward.

Furthermore, when the drive motor rotates forward, there is no member such as a protrusion for limiting the number of rotations of the introduction roller.
It can continue to rotate without interruption. As a result, even when the feeding of one document by the introduction roller is not performed smoothly and it takes time, the movement of the document does not stop in the feeding operation of one document.
There is no risk of giving the user distrust of the device.

[0036]

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of a reading apparatus provided with a paper feeding and conveying mechanism according to the present invention.

FIG. 2 is an enlarged perspective view showing a main part of a paper feeding and conveying mechanism in the reading apparatus according to the embodiment of the present invention;

FIG. 3 is a perspective view showing a state when a document is introduced in FIG. 2;

FIG. 4 is a sectional view of a side portion of the reading device according to the present invention when a document is fed;

FIG. 5 is a cross-sectional view of a central portion of the reading device of the present invention when a document is fed.

FIG. 6 is a cross-sectional view of a side portion of the reading device according to the present invention during document conveyance.

FIG. 7 is a cross-sectional view of a central portion of the reading device of the present invention during document conveyance.

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 introduction roller 4 feed roller 7 transport roller a 8 transport roller b 10 motor 12 planetary gear a 13 planetary gear b

Claims (2)

(57) [Claims] 1. A drive motor capable of rotating forward and backward, a paper feed roller for separating and feeding a document one by one together with a separation piece, and an introduction roller having an irregular outer periphery for feeding the document intermittently to the paper feed roller. And the circumference of the
An introduction roller gear having a notch in a part of the width, a transport roller for transporting the fed document through a reading point, and transporting the document at both forward and reverse rotations of the drive motor. A first transmission means having a first planetary gear for rotating in the direction, and not more than the width of the notch portion which engages with an arc portion which is not the notch portion of the introduction roller gear, rotates the introduction roller, reaches the notch portion, and then runs idle. Circumference of
An intermediate gear having a width, and a gear of the paper feed roller and the introduction roller gear constantly rotating when the drive motor rotates forward to rotate the paper supply roller and the introduction roller, The notch portion which is separated from the gear of the paper roller and the introduction roller gear and meshes with the intermediate gear.
And a second transmission means having a second planetary gear having a circumferential width larger than the width of the reading device. 2. A drive motor capable of rotating forward and reverse, and an introduction roller having an irregular outer periphery for intermittently feeding an original to a paper feed roller;
An introduction roller gear provided on the rotation shaft of the introduction roller and having a notch in a part of a circumferential width thereof; After reaching the notch, the width of the notch
An intermediate gear having a lower circumferential width , wherein the drive motor directly meshes with the introduction roller gear during normal rotation to rotate the introduction roller, and separates from the introduction roller gear during reverse rotation and meshes with the intermediate gear to rotate the intermediate gear. Before rotating
A planetary gear having a circumferential width larger than the width of the notch .