JPH08131862A - Paper feeder of shredder - Google Patents

Abstract

PURPOSE: To surely prevent locking of a shredding part of a paper feeder of a shredder by feeding-in of a paper bundle of a thickness exceeding a shredding capacity without lowering paper transporting efficiency. CONSTITUTION: This paper feeder has a front paper feed roller 20 on the font end side of a stage 11 to be paced with paper and a rear paper feed roller 21 on the rear end side. The paper feeder is provided with a paper thickness detecting means 40 for detecting the thickness of the paper bundle delivered by the front and rear paper feed rollers 20, 21 and a paper width detecting means 19 for detecting the paper width of the paper bundle. The shredding sectional area of the paper bundle is determined by a calculating means from the width of the paper bundle detected by this paper width detecting means 19 and the thickness of the paper bundle detected by the paper thickness detecting means 40 at the time of paper feeding. The driving of the second roller driving means E of the rear paper feed roller 21 is controlled in speed and the rotating speed of the rear paper feed roller 21 is controlled according to the shredding sectional area determined in such a manner, by which the thickness of the paper bundle is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be applied to a shredder for shredding paper such as discarded documents with a cutter in a shredding section.
More specifically, the present invention relates to a paper feeding device that is used by being attached to the shredder and that feeds paper to the shredder.

[0002]

2. Description of the Related Art Conventionally, in this type of paper feeder, generally,
It is more efficient than sending the sheets one by one, so multiple sheets are stacked and sent to the shredder. However, in the case of the overlap feeding, when the sheets are fed in a bundle of sheets having a thickness exceeding the shredding capacity of the shredding portion, the shredding portion may be locked by the sheet bundle.

Therefore, a conventional paper feeding device is provided with a paper thickness detecting means for detecting the thickness of the fed paper bundle, and the paper thickness detecting means confirms that the thickness of the paper bundle is not less than a certain value. In some cases, when it is detected, a warning device is activated to give a warning, or the drive of the paper feeding motor is automatically stopped.

However, if the drive of the paper feed motor is automatically stopped, the shredding work is interrupted halfway, which is inconvenient, and the paper feed motor must be restarted to restart the work. It must be troublesome. Even when a warning is given, the paper feeding must be stopped immediately after the warning, which is troublesome, and similarly, the shredding processing work is interrupted, which is inconvenient.

Therefore, when the applicant detects that the thickness of the sheet bundle is more than a certain value by the sheet thickness detecting means, the sheet conveying is continued as it is, while the conveying amount is limited to reduce the shredding ability. A paper feeding device that prevents a paper bundle having an excessive thickness from being fed to the shredder has already been proposed.

[0006]

However, since the shredding capacity of the shredding portion corresponds to the shredding cross-sectional area (thickness of paper stack × width) of the paper stack to be shredded by the cutter, it is conventionally required. As described above, merely adjusting the thickness of the sheet bundle is not sufficient to prevent the lock of the shredded portion due to the feeding of the sheet bundle having the paper amount exceeding the shredding ability.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reliably prevent the shredding portion from being locked by the feeding of a sheet bundle having a paper amount exceeding the shredding capacity in the paper feeding device of the shredder without lowering the transportation efficiency. To prevent.

[0008]

Therefore, the present invention provides
For example, as shown in the illustrated embodiment below, the stacked paper P
In a paper feeding device of a shredder that feeds a plurality of stacked sheets S to a shredder, a front and rear feed rollers 20 and 21 and upper and lower feeding rollers 34 and 35 that feed the sheet bundle S
And a sheet bundle S sent by the sheet feeding means
Paper thickness detecting means 40 for detecting the thickness t of the
Paper width detecting means 19 for detecting the paper width of the sheet bundle, the paper width of the sheet bundle S detected by the paper width detecting means 19, and the paper thickness detecting means 4
Calculation means for obtaining the shredded sectional area of the sheet bundle S from the thickness t of the sheet bundle S detected at 0, and the thickness of the sheet bundle S sent out by the paper feeding means according to the shredded sectional area obtained by the computing means And adjusting means for adjusting.

According to a second aspect of the present invention, for example, in the shredder sheet feeding apparatus according to the first aspect, the sheet width detecting means 19 is fed by the sheet feeding means as shown in the following illustrated embodiment. It is characterized in that it is arranged at a position where the width of the sheet bundle S can be detected.

[0010]

Then, the stacking sheet P is sent to the shredding section by the sheet feeding means into a sheet bundle S in which a plurality of sheets are stacked. Then
The thickness t of the sheet bundle S sent out is detected by the sheet thickness detecting means 40, and the sheet width of the sheet bundle S is detected by the sheet width detecting means 1.
Detect at 9. Then, the shredding cross-sectional area of the sheet bundle S is obtained by the calculating means from the sheet width of the sheet bundle S detected by the sheet width detecting means 19 and the thickness t of the sheet bundle S detected by the sheet thickness detecting means 40. The thickness of the sheet bundle S sent out by the paper feeding means is adjusted by the adjusting means according to the shredded cross-sectional area obtained by the calculating means.

According to the second aspect of the present invention, the paper width is detected by the paper width detecting means 19 after the paper bundle S is sent out by the paper feeding means.

[0012]

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

1 and 2 show a paper feed device for a shredder which is an embodiment of the present invention. Further, FIG. 1 shows the configuration of a paper transport system including a part of the drive system of the paper feeding device, and FIG. 2 shows the configuration of the remaining drive system.

In this paper feeding device, a paper conveying system is provided between laterally long side plates indicated by reference numeral a in FIG. 1 and reference numeral b in FIG. 2, and a drive system is provided outside one side plate b (front side in the drawing). ).

The front side of the sheet conveying system (the left side in FIG. 1)
Is provided with a paper feed path 10 for guiding a sheet to a shredder (not shown), and the rear side of the paper feed path 10 (right side in FIG. 1)
Is equipped with a loading platform 11.

The paper feed path 10 is formed by mounting an upper guide plate 12 and a lower guide plate 13 between the side plates a and b so as to be substantially horizontal between them. The right end portion of the lower guide plate 13 is bent downward in a crank shape, and a mounting step portion 13a is provided there.

The loading table 11 is formed by bending both sides of the plate-shaped tray portion 11a downward and rearwardly of the bent portion 11b (see FIG. 1).
A support shaft 14 is provided on the center right end side, and the support shaft 14 is rotatably supported about the support shaft 14 between the side plates a and b. Then, the tip end side (the left end side in FIG. 1) of the tray portion 11a is placed on the mounting step portion 13a to hold the loading table 11 substantially horizontally. The tray section 11a is provided with the paper presence / absence detection means 17 and the paper width detection means 19. Those detection means 1
As 7 and 19, for example, a micro switch or a photo sensor is used.

As the paper width detecting means 19, for example, as shown in FIG. 3, an example using a plurality of photosensors 19a is shown. In that example, as shown in FIG. 9A, each photo sensor 19a is set to a predetermined paper size (for example, A5 and B5) in the width direction of the stacked paper P set on the basis of one side.
・ A4, B4, and A3) are arranged at intervals. FIG. 11B shows an example in which a plurality of photosensors 19a are similarly arranged at intervals when the stacked sheets are set based on the center. By arranging in such a manner, the paper width detecting means 19 detects the paper width of the bundle of paper in a stepwise manner according to the predetermined paper size. This makes it possible to reliably detect the paper width for each predetermined paper size such as 4A / B4.

Further, as the paper width detecting means 19, for example, as shown in FIG. 4, a rod-shaped CCD element is used, and its CC
It is also possible to dispose the D element in the width direction of the stacked sheets P set with one side as a reference, as shown in FIG. FIG. 11B shows an example in which when the stacked paper P is set with the center as a reference, the CCD elements are similarly arranged across the stacked paper P in the width direction. With such an arrangement, the paper width detecting means continuously detects the paper width of the sheet bundle in the width direction regardless of the predetermined paper size. This makes it possible to detect the paper width of a bundle of paper other than the predetermined size.

Further, as shown in FIG. 1, in the paper transport system, a push-up arm 15 is provided below the leading end side of the tray portion 11a.
Is provided. The push-up arm 15 is formed by bending a plate material into an L shape and providing a protrusion 15a at the tip. Then, the base end portion is fixed to the arm shaft 16 that rotatably supports between the side plates a and b,
The protrusion 15a is arranged upward on the lower side of the tray 11a.

Therefore, above the stacking table 11, the front sheet feeding roller 20 is arranged on the front end side thereof, and the rear sheet feeding roller 21 is arranged on the rear end side thereof. The front paper feed roller 20 has a roller shaft 22.
Is hung between the side plates a and b to be rotatably supported. A rotating frame 24 is rotatably attached to the roller shaft 22.

The rotating frame 24 includes a flat plate portion 24a and downward bending plate portions 24b provided on both sides of the flat plate portion 24a.
Formed with. Further, the fixed shaft 29 is provided so as to project outward from the tip end side (the left end side in the drawing) of the bending plate portion 24b. Further, the rear sheet feeding roller 21 is rotatably attached to the rear end side of the bending plate portion 24b with the roller shaft 25 as a fulcrum. And the roller shafts 22 and 25 of both rollers 20 and 21
The pulleys 26 and 27 are mounted on the upper side.

Further, the rotating frame 24 is provided at its rear end side with roller driving means E which is a part of a driving system. The roller driving means E includes a motor 32 mounted on the flat plate portion 24a and a driving force of the motor 32, which is applied to the rear sheet feeding roller 21.
And a gear train G ₅ for transmission to. And the bending plate portion 2
4b supports the pulley 33 of the gear train G ₅ , and the pulley 3
A rotation transmission belt 28 is stretched between the pulley 3 and the pulley 27. Then, as shown in the figure, when the sheets are stacked on the sheet mounting surface 11c of the stacking table 11, the rear sheet feeding roller 21 rides on the stacked sheet P.

Further, in the above-described paper transport system, a lever shaft 30 is arranged in front of the front paper feed roller 20 in parallel with the roller shaft 22, and the lever shaft 30 is rotatable between the side plates a and b. To support. Then, the turning lever 31 is fixed to the lever shaft 30, and the tip end 31 a of the turning lever 31 is arranged to face the lower side of the fixed shaft 29.

Further, the upper conveying roller 34 is arranged in front of the lever shaft 30, and the lower conveying roller 35 is arranged below it. The upper and lower conveying rollers 34, 35 are in contact with each other in the sheet feeding path 10, and rotatably support the roller shafts 36, 37 by spanning them between the side plates a, b. The upper conveyance roller 34 has a roller shaft 36 that is strong and does not bend, while the lower conveyance roller 35 has a roller shaft 37 that is flexible. A pulley 38 is provided on the roller shaft 36, and the pulley 38 and the pulley 26 of the front paper feed roller 20 are provided.
A rotation transmission belt 39 is stretched between them.

Therefore, the paper thickness detecting means 40 supported by the upper guide plate 12 is arranged in front of the front paper feed roller 20.
The paper thickness detecting means 40 is composed of, for example, a filler 41 and a light reflection type micro displacement sensor 42. Fira 41
According to the thickness of the bundle of sheets passing between the conveying rollers 34 and 35, the shaft 41b is rotatably provided. Although not shown, the micro displacement sensor 42 is provided such that the light emitting portion and the light receiving portion face the base end portion 41 a of the filler 41. Then, the displacement amount of the filler 41 is detected based on the reflected light emitted from the light emitting portion of the micro displacement sensor 42, reflected by the base end portion 41a of the filler 41 and entering the light receiving portion, and the thickness of the sheet bundle is detected.

By the way, in the above-mentioned paper transport system,
The front paper feed roller 20 is rotatably supported between the side plates a and b, and as shown in FIG. 2, it is moved vertically by penetrating both ends of the roller shaft 22 through elongated holes 46 provided in the side plates a and b. Support as much as possible. The bearing 43 fitted in the long hole 46
Is provided on the roller shaft 22, and the bearing 43 is constantly urged downward by an urging spring 44 to abut against the edge of the elongated hole 46 to hold the front paper feed roller 20 at a predetermined height position. On the other hand, the micro detection switch 45 is attached near the front paper feed roller 20 and inside the side plate b. The actuator 45a of the micro detection switch 45 is constantly pressed against the roller shaft 22.

In addition to the roller driving means E described above, the driving system is provided with a loading table driving means indicated by reference numeral A in FIG. 2 and a rotating lever driving means B provided on the upper side thereof. Roller driving means C on the front side of B and A respectively
・ Provide D.

The loading platform driving means A has a motor 5
0, and a gear train G ₁ for transmitting the driving force of the motor 50 to the arm shaft 16 of the push-up arm 15. The rotation lever driving means B has a motor 51 and a gear train G ₂ for transmitting the driving force of the motor 51 to the lever shaft 30 of the rotation lever 31.
Is provided. The roller driving means C includes a motor 52 and a driving force of the motor 52, which is applied to the roller shaft 36 of the upper conveyance roller 34.
Gear train G ₃ for transmission to The roller driving means D includes a motor 53 and a gear train G ₄ that transmits the driving force of the motor 53 to the roller shaft 37 of the lower conveyance roller 35.

Although not shown in the figure, the sheet feeding device described above uses the paper width of the paper bundle detected by the paper width detecting means 19 and the thickness of the paper bundle detected by the paper thickness detecting means 40 to determine the shredded cross-sectional area of the paper bundle. A calculation means for calculating Further, there is provided an adjusting means for adjusting the rotation speed of the rear sheet feeding roller 21 by appropriately controlling the driving of the roller driving means E in accordance with the shredded sectional area of the sheet bundle obtained by the calculating means.

Therefore, the sheet feeding device having the above-described structure is properly mounted on the main body of the shredder for use.

During use, the operating switch is appropriately operated to drive the motor 51 of the rotating lever driving means B to rotate the rotating lever 31. Then, the tip end 31a of the rotating lever 31 is applied to the fixed shaft 29, and the rotating frame 24 is rotated to a certain angular position to open the top of the loading platform 11. Then, the waste sheets are stacked on the stacking table 11. Then, the presence / absence of the stacked paper P on the stacking base 11 is detected by the paper presence / absence detection means 17, and the paper width of the stacked paper P is detected by the paper width detection means 19.

Thereafter, the operation switch is operated to reversely drive the motor 51 of the rotating lever driving means B to rotate the rotating lever 3
1 is rotated in the opposite direction to return the rotating frame 24, and the rear sheet feeding roller 21 is placed on the stacked sheets. Then, a paper feed start switch (not shown) is turned on. Then, based on the detection signal indicating that there is paper in the paper presence / absence detection means 17, although not shown, the control means operates the motor 50 of the loading platform drive means A, and the driving force of the motor 50 is changed to the gear train G ₁ Is transmitted to the arm shaft 16 to rotate the push-up arm 15, and the push-up arm 15 rotates the loading table 11 to push up the tip end side thereof. When the leading end side of the stacked paper P hits the front paper feed roller 20, the actuator 45a moves slightly upward to turn on the micro detection switch 45, and the stacked paper P
It is detected that the topmost one is at a predetermined height position.
Then, based on the detection signal, the above-mentioned control means stops the operation of the motor 50 of the loading platform driving means A, and holds the loading platform 11 at this predetermined height position as shown in FIG. At this time, the paper thickness detecting means 40 is in a state of not detecting the paper thickness, as shown in FIG.

Then, the motor 52 of the roller driving means C is driven, and the driving force thereof is transmitted by the gear train G ₃ to rotate the upper conveying roller 34, and at the same time, the motor 53 of the roller driving means D is driven to drive the same. The force is transmitted by the gear train G ₄ to rotate the lower conveyance roller 35. Then, the front paper feed roller 20 is rotated in synchronization with the upper conveyance roller 34 via the rotation transmission belt 39. Further, the motor 32 of the roller driving means E is driven, and the driving force thereof is transmitted via the gear train G ₅ and the rotation transmission belt 28 to rotate the rear sheet feeding roller 21. Then, as shown in FIG.
At 1, the stacked sheets P are fed out.

At that time, when the uppermost first sheet s is fed out by the distance d (distance between the roller shaft 25 and the rear end of the stacked sheets P), the rear sheet feeding roller 21 comes into contact with the second sheet and Start feeding the first sheet. Similarly, after feeding the second sheet by the same distance d, the second sheet comes into contact with the third sheet, and as shown in FIG. Eventually, the sheets s are continuously fed while forming the sheet bundle S while being displaced by the distance d, and are conveyed to the shredder of the shredder through the sheet feeding path 10 by the upper and lower conveying rollers 34 and 35. At that time, assuming that the length of the sheet s is L as shown in FIG. 9, the relationship of (n-1) <L / d ≦ n sheets is established, and normally n sheets are fed, and n × (sheets (1 sheet thickness)
= (The thickness t of the sheet bundle S).

At the time of this conveyance, the filler 41 of the paper thickness detecting means 40 is rotated clockwise from the state shown in FIG. 6A according to the thickness t of the sheet bundle S, as shown in FIG. The micro displacement sensor 42 detects the amount of displacement of the filler 41 at that time to detect the thickness t of the sheet bundle S. Then, from the thickness of the sheet bundle S thus detected and the sheet width of the sheet bundle S detected by the sheet width detecting means 19 as described above,
The shredding cross-sectional area of the sheet bundle S is obtained by the calculating means. Then, when the shredded cross-sectional area is equal to or larger than the preset predetermined value X, the driving of the roller driving means E is controlled to be decelerated by the above-mentioned adjusting means to slow the rotation speed of the rear sheet feeding roller 21. Then, according to the slow speed, the deviation of the rear end of the sheet s fed by the rear sheet feeding roller 21 increases from d to d ₁ as shown in FIG. At that time, (m-1)
<L / d ₁ ≦ m, and m <n. That is, the number of sheets fed by the rear sheet feeding roller 21 is reduced by that much, and as a result, the shredded sectional area of the sheet bundle S is reduced.
Then, the sheet bundle S is adjusted so as not to become thick.

On the contrary, when the thickness t of the sheet bundle S is thinned and the shredded sectional area is equal to or smaller than the predetermined value X, the driving of the roller driving means E is accelerated and controlled by the adjusting means. Then, the rotation speed of the rear sheet feeding roller 21 is increased. Then
Depending on the high speed, the deviation of the rear end of the sheet s fed by the rear sheet feeding roller 21 is from d to d _{2 as} shown in FIG.
It becomes short. That is, the number of sheets fed out by the rear sheet feeding roller 21 increases correspondingly, and as a result, the shredded cross-sectional area of the sheet bundle S increases and approaches the predetermined value X. Then, the sheet bundle S
Adjust to increase the thickness of.

By the way, in the present invention, for example, FIG.
As described above, it is preferable to arrange the above-described paper width detection means 19 on the downstream side in the paper conveyance direction. The paper width detecting means 19 is attached to, for example, the upper guide plate 12 toward the paper feed path 10. And the front and rear sheet feeding rollers 20 and 21
After the stacked sheets P have been sent out by, the sheet width detection means 19 detects the sheet width of the sheet bundle S when passing through the sheet feeding path 10.

However, even if the paper width changes midway after the paper is sent out, as in the case of sending out stacked sheets of paper of different width sizes, the changed paper width is detected by the paper width detecting means 19 and Paper width and paper thickness detecting means 40
The shred cross-sectional area of the sheet bundle S is obtained from the thickness detected in step S1, and the rotational speed of the rear sheet feeding roller 21 is changed according to the changed shred cross-sectional area to adjust the thickness of the sheet bundle.

Further, in the above embodiment, the thickness of the sheet bundle is adjusted by changing the rotation speed of the rear sheet feeding roller 21 in accordance with the shredded cross-sectional area of the sheet bundle to be sent out. However, according to the present invention, for example, the thickness of the sheet bundle can be adjusted according to the shredded cross-sectional area of the sheet bundle by the configuration shown in the following embodiments.

That is, for example, the upper transport roller 34 shown in FIG. 12 is used as a forward transfer roller, while the lower transport roller 35 is used.
Is configured as a reversible roller capable of reversing forward and backward.
When the shredded cross-sectional area of the sheet bundle is equal to or smaller than the predetermined value X, the forward transfer roller 34 and the reversible roller 35.
On the other hand, when both of them are rotated in the normal direction, when the value is equal to or more than the predetermined value X, the reversible roller 35 is rotated in the reverse direction to return the sheet bundle onto the stacking table 11, thereby adjusting the thickness of the sheet bundle.

[0042]

Therefore, according to the present invention, at the time of sheet feeding, not only the thickness of the sheet bundle, but also the sheet feeding means according to the shredded cross-sectional area of the sheet bundle by the cutter, which is obtained from the sheet thickness and the sheet width. The configuration is such that the sheet conveyance amount is adjusted, whereby it is possible to reliably prevent the sheet bundle having a sheet amount exceeding the shredding capability from being fed and the shredding portion to be locked.

According to the second aspect of the present invention, the paper width of the bundle of papers is detected by the paper width detecting means after the papers are sent out. Therefore, for example, when the stacked papers with different widths are mixed, the paper is sent out. Even if the paper width changes in the middle later, the paper feeding amount can be appropriately changed by the adjusting means in accordance with the change.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a paper transport system including a part of a drive system of a paper feeder of a shredder which is an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing the remaining drive system.

FIG. 3A is a layout configuration diagram in which paper width detecting means are installed at intervals according to a predetermined paper size set on the basis of one side and FIG. 3B on the basis of center.

FIG. 4A is a layout configuration diagram in which the sheet width detecting means is installed across the sheet width set in the width direction of the stacked sheets set with one side reference and FIG. 4B center reference.

FIG. 5 is an explanatory diagram of a sheet ready state of the sheet feeding device.

FIG. 6A is a state explanatory view showing a paper thickness non-detection state by the paper thickness detection means, and FIG. 6B is a state explanatory view showing a paper thickness detection state.

FIG. 7 is an explanatory diagram of a state immediately after the start of sheet feeding in this sheet feeding device.

FIG. 8 is a state explanatory view showing a state after the rear sheet feeding roller contacts the second sheet.

FIG. 9 is a state explanatory view showing a state in which sheets are shifted to form a bundle of sheets and the sheets are sent out.

FIG. 10 is an explanatory diagram of a state when the rotational speed of the rear sheet feeding roller is slowed to increase the deviation of the sheet.

FIG. 11 is an explanatory diagram of a state when the rotational speed of the rear sheet feeding roller is increased to reduce the deviation of the sheet.

FIG. 12 is a partial schematic configuration diagram of a front side of a paper feeding device according to another embodiment of the present invention.

[Explanation of symbols]

 19 Paper Width Detection Unit 20/21 Front / Back Feeding Roller (Paper Feeding Unit) 34/35 Vertical Conveying Roller (Paper Feeding Unit) 40 Paper Thickness Detecting Device P Stacked Paper S Paper Bundle t Paper Bundle Thickness

Claims (2)

[Claims] 1. A paper feed device for a shredder that feeds a stack of a plurality of stacked sheets to a shredder and feeds the sheet bundle, and the thickness of the sheet bundle sent by the sheet feeding means. From the sheet width detecting means for detecting the sheet width, the sheet width detecting means for detecting the sheet width of the sheet bundle, the sheet width of the sheet bundle detected by the sheet width detecting means, and the thickness of the sheet bundle detected by the sheet thickness detecting means. A shredder feeding device comprising: a calculating means for obtaining a shredded cross-sectional area of a sheet bundle; and an adjusting means for adjusting the thickness of the sheet bundle sent out by the paper feeding means according to the shredded sectional area obtained by the calculating means. Paper equipment. 2. The paper feed device for the shredder according to claim 1, wherein the paper width detection means is arranged at a position where the paper width of the sheet bundle fed by the paper feed means can be detected.