JPH01308329A - Paper feeder - Google Patents

Abstract

PURPOSE:To eliminate the necessity for performing operation of setting a position of a carrier while decreasing resistance of a feed roller by providing the carrier which moves to a position in accordance with a paper width forcing a pressing roller to come into press contact with the feed roller. CONSTITUTION:When a document S is in width size of A3, a carrier 90 is moved to a position corresponding to a photosensor A3. When the movement is completed, next a cam motor 71 is electrified rotating a cam shaft 74 by 90 deg. through a reduction gear mechanism. As the result, a pressing roller 91a in a front side is forced to come into press contact with a feed roller 10b in the front side through a right end part of the document S in a position corresponding to the photosensor A3. Here because a cam member is 90 deg. rotated also in a rail unit 80, a front side pressing roller 81a is forced to come into press contact with a front side feed roller 10a through a left end part of the document S in the home position. Successively rotating the feed rollers 10a, 10b, the document is fed to a rear side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device, and more particularly to a paper feeding device that feeds paper such as a document or recording paper using a feed roller and a pressure roller.

[Conventional technology]

Conventionally, this type of paper feeding device has been provided with feed rollers and pressure rollers at predetermined intervals across the entire width of the paper feed, and all the pressure rollers were in pressure contact with the feed roller during paper feeding, regardless of the width of the paper. .

It also has a pair of pressure rollers, one located at the home position and the other mounted on a carrier that is movable in the width direction of the paper, and the carrier is moved manually or manually and electrically to the edge of the paper. A paper feeding device is also known in which the paper is fed by moving a pressure roller to press the feed roller only at both ends of the paper.

[Problem to be solved by the invention]

In the conventional paper feeding device described above, pressure rollers are provided at predetermined intervals across the entire width of the paper feed, and all the pressure rollers are in pressure contact with the feed roller regardless of the width of the paper during paper feeding. There is a problem in that a lot of resistance is applied to the feed roller, and a lot of load is also placed on the feed motor that rotates the feed roller.

Additionally, in order to avoid paper feeding stoppage due to high load on the feed motor, the feed motor must be powerful, which creates the problem of having to use a large or expensive feed motor. I was.

On the other hand, in a paper feeding device in which the carrier is manually or manually operated and electrically moved to the end position of the paper, and the paper is fed by pressing the pressure roller against the feed roller only at both ends of the paper, the position of the carrier is Settings are manual or manual 1
Since this is done electrically by Kuwasaku, there are problems in that it is cumbersome to operate and difficult to accurately position.

In view of the above-mentioned points, it is an object of the present invention to reduce the resistance of the feed roller by adjusting the width of the paper, automatically moving the carrier according to the width of the paper, and bringing the pressure roller into pressure contact with the edge of the paper. It is an object of the present invention to provide a paper feeding device that reduces the number of operations required for carrier position setting.

[Means to solve the problem]

The paper feeding device of the present invention is arranged at a home position corresponding to one end in the width direction of paper to be fed and at several positions corresponding to the other end in the width direction of paper of several width sizes. a plurality of photosensors that detect paper width; a bail unit that is provided at the home position and presses a pressure roller against a feed roller via one end of the paper;
a carrier that moves to a position according to the paper width detected by the photo sensor and presses the pressure roller against the feed roller through the other end of the paper; and a carrier that rotates to press the paper that is pressed by the pressure roller. It is characterized by comprising the feed roller for feeding.

[Effect]

In the paper feeding device of the present invention, a home position corresponding to one end in the width direction of paper to be fed and a number of positions corresponding to the other end in the width direction of paper of several width sizes are arranged. Multiple photosensors detect the paper width, and the bail unit installed at the home position presses the pressure roller against the feed roller via one end of the paper, and the carrier is positioned according to the paper width marked by the photosensor. The press roller is moved to press the feed roller through the other end of the sheet, and the feed roller rotates to feed the sheet pressed by the press roller.

(Example〕 Next, the present invention will be explained in detail with reference to the drawings.

FIGS. 1 and 2 are a plan view and a front view showing a paper feeder according to an embodiment of the present invention. (
This is applied to a large document reading device that can read up to (Fig. 3).

In this document reading device, a document guide table 1 is supported by a pair of legs 2a and 2b and is disposed horizontally. (Upper side in Figure 1)
A pair of photosensors HP, A4~
A1 is arranged. The front-side and rear-side photosensors IP are arranged at the home position, which is the left end side of the document guide table 1, and are adapted to detect the left end portions of documents S of all width sizes.

In other words, the document guide table 1 includes the document guide table L and the insertion guide plate 13 while guiding the left end of the document S along the document guide 12 that defines the home position.
(See FIG. 3) A document S is inserted between the two.

The front and rear photosensors A4 are placed at a distance slightly shorter than the widthwise length of the A4-sized document S from the home position, and are designed to detect the right edge of the A4-sized document S. ing. Similarly,
Photo sensor A3. A2 and A1 are placed at positions slightly shorter than the widthwise length of the A3 size, A2 size, and AI size originals from the home position, respectively, and are located at the right edge of the A3 size, A2 size, and A1 size originals S. It is designed to detect each.

The photosensors HP, A4 to A1 on the front side have the role of detecting the document width and checking the skew of the document S. i#! When you insert the
With the leading edge of the document S being pushed up against the paper stopper 41 (see Figure 3), the photosensor HP and photosensor A4 located at the front home position are turned on, so that the document S has the width of A4 size. is detected.

Similarly, in the case of a document S having an Al size width, photosensor HP and photosensor A4. A3. Since A2 and A1 are turned on, it is detected that the document S has the width of the Al size.

The rear photosensors HP, A4 to AI have the role of checking the skew of the document S, checking the jam, and checking the paper end. If the side photosensor HP and photosensor A4 are turned off at i11, the rear end (paper end) of the document S is detected. Also,
For example, after the tip t: of the document S passes through the front side photosensor HP and photosensor A4, the rear side photosensor HP and photosensor A
4 are turned on at the same time, it means that the document S was sent without being skewed, and if they are not turned on, it is detected that a jam has occurred in the original IgIS.

Further, the document guide table 1 is provided with feed rollers loa and 10b along the front side, and feed rollers 10c and 10d along the rear side, respectively. Front side feed rollers 10a and 10
b is fixed coaxially to the front side feed roller shaft 11a, and the feed roller 10a with the short axis length is attached to the front side photosensor HP located at the home position.
A feed roller 1 with a long axis length is arranged to correspond to
0b is arranged so as to correspond to all of the front side photosensors A4 to A1. Similarly, the rear feed rollers 10c and 10d are coaxially fixed to the rear feed roller shaft 11b, and the short-axis feed roller 10c corresponds to the rear photosensor HP located at the home position. The feed roller 10d, which has a long axis, is arranged so that the feed roller 10d has a long axis.
It is arranged to correspond to all AI.

Further, three line image sensors 30a to 30c are arranged at the center of the document guide table 1 so that the main scanning direction is the left and right direction, and a reading section 30 is arranged in the sub-scanning direction.
They are arranged in a staggered manner with the positions T and orientations of 0a1 to 30CI (see Fig. 3) being alternately different. As shown in FIG. 3, these line image sensors 30a to 30c are fixed to the image sensor mounting adjustment plate 32 so as to face the lower surface of the platen glass 31. are placed and arranged on the image sensor mounting base 33, respectively. The image sensor mounting base 33 is attached to the left and right side frames 1a and 15 of the document guide table l.
It is fixedly installed on a base frame 37 installed between them. Image sensor installation jl! ] The straightening plate 32, that is, the line image sensors 30a to 30c, is 1! It can be moved and adjusted in the front-rear direction with the adjusting screw 34, in the up-down direction with the adjusting screw 35, and in the left-right direction with the adjusting screw 36 (see FIG. 2).

As described above, the three line image sensors 30a to 3
0c in the sub-scanning direction of reading units 30al to 30c+
The reason why the positions and orientations of the line image sensors 30a to 30c are arranged in a staggered manner is to prevent omissions in reading the document S between the line image sensors 30a to 30c, and to prevent the reading of the original S from occurring between the line image sensors 30a to 30c, as well as to improve the accuracy in the sub-scanning direction between the reading units 30a1 to 30c3. This is to narrow the interval and facilitate adjustment of reading retiming of the line image sensors 30a to 30c.

As a result of arranging the three line image sensors 30a to 30c in a staggered manner with the positions and orientations of the reading units 30a, to 30C alternated in the sub-scanning direction, the line image sensors 30a and 30c are in the phase for pre-reading. The read information from the line image sensor 30b in the phase that performs subsequent reading is shifted by the phase difference, and the read control signal for the line image sensors 30a and 30c in the phase that performs the preceding reading is Needless to say, it is necessary to reverse the order in which the read control signals are given and the order in which the read control signals are given to the line image sensor 30C in the phase that performs subsequent reading.

As shown in FIG. 3, a rotating plate 46 is swingably attached to the front feed roller shaft 11a, and the base of a paper stopper 41 is fixed to one end of the rotating plate 46. . The tip of the paper stopper 41 has a plurality of protrusions, and these protrusions serve as photo sensors HP of the document guide table l.

At the other end of the zero rotation plate 46, which protrudes above the document guide table 1 through a plurality of through holes drilled in the vicinity of A4-A1 and temporarily restricts the further intrusion of the document S,
6. The other end of the six actuating body 44 is connected to one end of an actuating body 44 that is swingably supported on a support shaft 42 and urged to rotate counterclockwise (in FIG. 3) by a coil spring 43. A plunger of a paper stopper solenoid 45 fixed in the document guide table 1 is connected to the solenoid 45 .

The front feed roller shaft 11a and the rear feed roller shaft 11b are rotatably installed between the left and right side frames la and lb of the document guide table 1.

As shown in tW, the output shaft of a feed motor 50 is connected to the right end of the front feed roller shaft 11a protruding from the right side frame 1b of the document guide table l via a reduction gear mechanism 51. . On the other hand, at the left end of the front feed roller shaft 11a protruding from the left side frame la of the document guide table 1, as shown in FIG.
a is fixed. A gear 52b and a boo IJ are also attached to the left end of the rear feed roller shaft 11b protruding from the left side frame 1a of the document guide table l.
53b is fixed.

A belt 54 is passed between the pulleys 53a and 53b, and tension is applied to the belt 54 by a tensile pulley 55. Therefore, the front feed roller shaft 11a and the rear feed roller axis 1
1b rotates in the same direction at the same speed by the driving force of the feed motor 50 via a pulley 53a, a belt 54, and a pulley 53b.

Furthermore, original feed belt driving gears 61a and 61b are meshed with the gears 52a and 52b, respectively. The document feed belt drive gears 61a and 61b are fixed to the left ends of document feed belt drive shafts 62a and 62b, which are rotatably installed between the side frames 1a and lb, and protrude from the left side frame la, respectively. The document feed belt drive shafts 62a and 62b include
As shown in FIG. 3, the document feed belt drive roller 63a
and 63b are fixed respectively. A document feed belt 64 whose outer peripheral surface is at a white level is passed between the document feed belt drive rollers 63a and 63b. It is brought into pressure contact with the platen glass 31 by a pair of press rollers 67a and 67b urged downward by a spring 66. Therefore, the document feed belt 64 is transported by the driving force of the feed motor 50 simultaneously with the rotation of the front and rear feed roller shafts 11a and llb. Note that the transport speed of the document feed belt 64 and the outer peripheral speed of the feed rollers 10a to 10d are set to be approximately equal.

Furthermore, as shown in Fig. 5, the left side frame l
A cam motor 71 is fixed to the inside of the side frame 1a, and the cam motor 7 extends outward through the side frame 1a.
A gear 73 is meshed with the output shaft of No. 1 via a reduction gear mechanism 72. This gear 73 is fixed to the left end protruding from the side frame 1a of a camshaft 74 rotatably installed between the side frames la and lb. An initial plate 75 is integrally attached. An actuator of a limit switch 76 is in contact with the outer peripheral surface of the initial play door 5, and the initial rotational position of the camshaft 74 is detected by a projection 75a.

The camshaft 74 is attached to the side frame 1 as shown in FIG.
The cross section between a and lb is square, and the bail unit 80 (see Figure 1) and carrier 90 (first
(see figure) is arranged so as to be inserted through this camshaft 74.

The bail unit 80 is fixed at a home position, and is configured to press the left end of the document S using front and rear pressing rollers 81a and 81b.

Further, the carrier 90 moves the camshaft 7 between the position corresponding to the photosensor A4 and the position corresponding to the photosensor A1.
4, and presses the right end of the document S by front and rear pressing rollers 91a and 91b.

The bail unit 80 and the carrier 90 have the same structure with the only difference being that the bail unit 80 is fixed and the carrier 90 is movable. 90, as shown in FIG.
4, and the mounting plates 90a and 9
A guide frame 1 in which sliding bodies 90c and 90d screwed to 0b are installed between side frames la and lb.
Guide rails 1θ and If fixed to c and 1d
It is designed to slide in the main scanning direction while being fitted and guided by.

The cam member 92 has a shape in which two fan-shaped cam plates are joined with a phase difference of about 70 degrees, and the cam surface of the cam member 92 has rollers 94a and 94a attached to arms 93a and 93b. 94b are in contact with each other. Arms 93a and 93b are swingably supported by support shafts 95a and 95b, and are supported by coil springs 96.
a and 96b give a habit of rotating clockwise and counterclockwise around support shafts 95a and 95b, respectively. Arms 93a and 9 due to this habit
Rotation of the cam member 92 is normally restricted by the rollers 94a and 94b coming into contact with the cam surface of the cam member 92. Front and rear pressure rollers 91a and 91b are rotatably attached to the ends of arms 93a and 93b opposite to the rollers 94a and 94b, respectively.

On the cam surface of the cam member 92 opposite to the one in contact with the rollers 94a and 94b, there are rollers 98a of balance arms 97a and 97b that average out the reaction torque of the cam member 92.
and 98b are in contact with each other. The balance arms 97a and 97b are mounted with torsion springs 9 on the mounting plate 9Qe.
9a and 99b, it is swingably biased and attached.

Further, as shown in FIG. 1, a carrier motor 101 is fixed to the lower surface of a mounting plate 1g installed at a position near the home position between the front and rear guide frames 1c and 16. The output shaft of the carrier motor 101, which protrudes upward through the mounting plate 1g, is connected to the output shaft of the carrier motor 101 via a reduction gear mechanism.

A carrier moving belt 04 is hooked between this pulley 102 and a boot 03 which is rotatably supported on a part of the right side frame 1b. A portion of the linearly extending portion on the pronto side is fixed to the mounting plate 90e of the carrier 90 by a mounting portion 100 (see FIG. 3). Therefore, when the carrier motor 101 is driven, the pulley 102 rotates, the carrier moving belt 104 is transferred, and the carrier 90 slides along the camshaft 74 in the main scanning direction.

Furthermore, the photosensor A of the rear guide frame 1d
Near the position corresponding to No. 4, a No. 7 sensor 105 for detecting the initial position of the carrier 90 is arranged.

Next, the operation of the paper feeding device of this embodiment configured as described above will be explained. Note that here, the document S to be fed is
An example will be explained in which the document is an A3 size document.

First, when you turn on the power to the paper feeder, the -r-
The carrier moving belt 104 is moved by 101-h<X1 overnight, and the carrier moving belt 104 is transferred via the pulley 102, and the carrier 90 is moved in the direction of the initial position corresponding to the photosensor A4. Then, when the photosensor 105 detects that the carrier 90 has been moved to the initial position, the drive of the carrier motor 101 is stopped, and the carrier 90 stands still at the initial position.

From this state, in order to read the document S, place the leading edge of the original WIS onto the document guide table 1 from the front side.
When the document S is inserted until it hits the vapor stopper 41, the document S is detected by the front photosensors HP, A4, and A3. Therefore, it is determined that the width size of the document S is A3 size, and the carrier motor 101 is driven to move the carrier 90 from the initial position to the position corresponding to the photosensor A3. This allows the carrier to move via the pulley 102 (bell for carrier movement).
104 is transferred, and the carrier 90 is attached to the photosensor A.
Move to the position corresponding to 3.

When the movement of the carrier 90 is completed, the cam motor 71
The camshaft 7 is energized through the reduction gear a mechanism 72.
4 is rotated 90 degrees counterclockwise (in FIG. 3). As a result, in the carrier 90, as shown in FIG.
The cam member 92 is rotated 90 degrees counterclockwise, and the front arm 9 is moved back toward the cam shaft 74 by the cam surface.
3a rotates clockwise around the support shaft 95a due to the elasticity of the coil spring 96a, and presses the front pressure roller 91a.
is pressed against the front feed roller 10b via the right end of the document S at a position corresponding to the photosensor A3.

At this time, also in the bail unit 80, the cam member (
(not shown) is rotated 90 degrees counterclockwise, so that the front-side suppression roller 81a is in the home position and the original
The feed roller 10a on the front side is pressed through the left end portion of the feed roller 10a.

The front pressure rollers 81a and 91a pass the document S to the front feed rollers 10a and 10b.
Then, as shown in FIG. 4, the vapor stopper solenoid 45 is driven, and the actuating body 44 is rotated around the support shaft 42 against the elasticity of the coil spring 43. The plate 46 rotates around the feed roller shaft 11a, and the protruding piece of the paper stopper 41 touches the document guide table 1.
The document S above is evacuated from the path.

When the protrusion of the paper stopper 41 completes retraction of the document S on the document guide table 1 from the path, the feed motor 50 is driven, and the feed roller shaft 11a is rotated counterclockwise via the reduction gear mechanism 51. The document S is sent to the rotation side of the feed rollers 10a and 10b while its right and left ends are pressed against the feed rollers loa and 10b by the front pressure rollers 81a and 91a. At this time, at the same time as the front side feed rollers 10a and 10b rotate, the pulley 53a,
The rear feed roller shaft 11b is also rotated via the belt 54 and the boo IJ 53b, and the rear feed rollers 10c and 10d are also rotated. In addition, the gear 52a
, 52b and document feed belt drive gears 61a, 61
document feed belt roller shafts 62a and 62b via b
is rotated, and the document feed belt rollers 63a and 63b
Accordingly, the document feed belt 64 is also fed from the front side to the rear side while facing the platen glass 31.

When the document S is fed and its leading edge reaches the position of the platen glass 31, the document S is also sandwiched between the platen glass 31 and the document feed belt 64, and is fed, and while passing over the platen glass 31, a line image is formed. Images are read by sensors 30a to 30c.

Further, when the document S is fed and its leading edge passes through the rear photosensors HP, A4, and A3, it is detected that the leading edge of the document S has been fed normally, and the cam motor 71
is driven again, and the camshaft 74 is rotated 180 degrees counterclockwise. Therefore, the cam member 92 rotates 180 degrees, and as the cam surface retreats toward the camshaft 74, the rear arm 93b rotates counterclockwise around the support shaft 95b due to the elasticity of the coil spring 96b. Rear side pressure roller 91
b is pressed against the rear feed roller 10d via the right end of the document S at a position corresponding to the photosensor A3.

Similarly, in the bail unit 8o, the rear pressure roller 81b is pressed against the rear feed roller 10c.

Also, the document S on the rear side pressure rollers 81b and 91b is
Subsequently, the cam surface of the cam member 92 is separated from the camshaft 74 side, and the front arm 93a resists the elasticity of the coil spring 96a and presses against the support shaft 95a. The front pressure roller 91a is separated from the front feed roller 10b by rotating counterclockwise. Similarly,
In the bail unit 80 as well, the front-side suppression roller tna is separated from the front-side feed roller 10a.

Therefore, after this, the document S is moved to the rear pressing roller 8.
1b and 91b, the rear feed roller 10
While being pressed against c and 10d, the feed roller 10
c and 10d rotations.

When the trailing edge of the document S passes through the rear photosensors HP, A4, and A3, it is detected that the document S has been normally fed to the trailing edge, and the cam motor 71 is driven again to move the camshaft 74 counterclockwise. is rotated 90 degrees. As a result, in the carrier 90, the cam member 92 returns to the state shown in FIG. 3, and the rear arm 93b is supported against the elasticity of the coil spring 96b due to the separation of the cam surface of the cam member 92 from the camshaft 74 side. 11b95 Rotate clockwise around b,
The rear pressure roller 91b is the rear feed roller 1.
separated from 0d. Similarly, in the bail unit 80, the rear pressure roller 81b is separated from the rear feed roller 10C. Then, the limit switch 76 detects the protrusion 75a of the initial plate 75, and the cam motor 71 is stopped at the initial rotation position of the camshaft 74.

At the same time, the drive of the feed motor 50 is stopped, and the front side and rear side feed roller shafts 1
The rotations of 1a and llb are stopped, and the feeding of the original S by rear-side pressure rollers 81'b and 91b and feed rollers IOC and 10d is stopped.

Further, the drive of the vapor stopper solenoid 45 is stopped, and the elasticity of the coil spring 43 causes the operating body 44 to move to the support shaft 4.
2 in the counterclockwise direction, and the rotating plate 46 rotates clockwise around the feed roller shaft 11a, so that the projecting piece of the paper stopper 41 is moved into the path of the document S on the document guide table 1. It becomes a state in which it protrudes to prevent the insertion of the original S. Therefore, the paper feeding device returns to the initial state in which the document S can be read subsequently.

After that, when the original IKS is inserted into the original guide table 1 in order to read the original S again, the carrier 90 moves from the position corresponding to the photosensor A3 to the position corresponding to the width size of the original S, and then the original IKS is inserted into the original IKS to read the original S. feeding begins.

In the above embodiment, the paper feeding device is a large document reading device, but it goes without saying that the present invention can be applied not only to document reading devices, but also to printers, plotters, and the like.

(Effects of the Invention) As explained above, the present invention detects the width of the paper, automatically moves the carrier according to the width of the paper, and presses the carrier against the feed roller via the edge of the paper using the pressure roller. As a result, the number of pressure rollers can be reduced to a minimum of two, and the resistance of the feed roller is reduced, so there is no longer a burden on the feed motor as in the past, and the feed motor does not need to be large or expensive. This has the effect of eliminating

Furthermore, since there is no need for manual or manually operated electric positioning in order to move the carrier to the edge of the paper, there is an effect that accurate positioning of the carrier can be performed without troublesome operations.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a paper feeding device according to an embodiment of the present invention, Fig. 2 is a front view of the paper feeding device shown in Fig. 1, and Fig. 3 is an enlarged view of the paper feeding device shown in Fig. 1. 4 is a cross-sectional view, and FIG. 4 is a diagram showing the main part of the paper feeding device shown in FIG. 3, and FIG. 5 is a side view of the paper feeding device shown in FIG. 1. In the figure, l...document guide table, la, lb side frame, lc, ld guide frame, 1Qa-10d feed roller, 11a, 11b feed roller shaft, 12...
・・Document guide, 308~30c・Line image sensor, 31・・・・
・Platen glass, 41...Paper stopper, 45...Solenoid for paper stopper, 50...
...Feed motor, 52a, 52b - Gear, 53a, 53b - Pulley, 54... Belt, 61a, 61b - Original feed belt driving gear, 64...
...Document feed belt, 71...Cam motor, 74...Cam shaft, 75...Initial plate, 75a...Protrusion, 76...Limit switch, 80 ...Bail unit, 818.81b Press roller, 90 ... Carrier, 92 ... Cam member, '93a, 93b Arm, 978.97b Balance arm, 101 ...・Carrier motor, 104...
...Carrier movement belt, HP, A4~Al, photo sensor, S...Manuscript. Patent applicant Silver Seiko Co., Ltd.

Claims (1)

[Claims] A home position corresponding to one end in the width direction of the paper to be fed and a number of positions corresponding to the other end in the width direction of paper of several width sizes to control the paper width. a plurality of photosensors for detection; a bail unit provided at the home position for pressing a pressure roller into contact with a feed roller through one end of the paper; and a bail unit for moving the paper to a position according to the paper width detected by the photosensor. A paper feeding device comprising: a carrier that presses a pressure roller against a feed roller via the other end of the paper; and the feed roller that rotates and feeds the paper pressed by the pressure roller.