JPH08192067A - Paper feeder of shredder - Google Patents

Abstract

PURPOSE: To prevent the rear side of a paper feed belt from riding on a stage and the smooth transportation of paper bundles from being hindered with a paper feeder of a shredder even if the paper for placement runs short or the length thereof is short. CONSTITUTION: The belt transporting means 60 of a specified weight is composed of front and rear paper feed rollers 20, 21, a paper feed belt 30 and a turning arm 24 above the stage 11. On the other hand, the stage 11 is formed by highly curing the central part in its longitudinal direction. The paper P for placement is then placed and set on the stage 11 and the belt transporting means 60 is placed on the paper P for placement. The rear side of the paper feed belt 30 is held in a position apart from the stage 11 at all times.

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 sheet feeding device that is used by being attached to the shredder and that feeds shredded paper to the shredded portion G.

[0002]

2. Description of the Related Art Conventionally, in this type of paper feeder, generally,
Since it is more efficient than sending the shredded sheets one by one, they are sent to the shredder by stacking multiple sheets.

For this reason, in the prior art, for example, as shown in FIG. 9, the paper feed belt 2 is stretched between the rollers 3 and 4 on the upper side of the apparatus main body 1 and the left side in the figure is inclined downward. There is a configuration in which the shredded sheets are arranged on the sheet feeding belt 2 at the time of sheet feeding and the sheet feeding belt 2 is driven to feed the sheet bundle S from below the stacked sheets P to the shredding section.

By the way, in such a type, since the shredded sheets are stacked on the sheet feeding belt 2 and the sheet bundle S is sent out from the lower side of the stacked sheets P by the sheet feeding belt 2, the stacking amount is large. When the stacked sheets P are relatively heavy, the sheet bundle S can be delivered by the friction between the lowest sheet and the sheet feeding belt 2. However, since the stacking capacity is reduced to several sheets, the stacked paper P
When becomes lighter, the bundle of sheets S cannot be delivered because the frictional force between the lowermost sheet and the sheet feeding belt 2 is weak.

Therefore, the applicant has already proposed a paper feeding device which does not become impossible to carry even if the stacked sheets are small and the stacked sheets are light.

That is, the sheet feeding device has a front sheet feeding roller 3 arranged on the front end side above the shredded sheet placing table 5 as schematically shown in FIG. A rotary frame 6 is rotatably mounted on the roller shaft 3a, and a rear paper feed roller 4 is mounted on the rear end side of the rotary frame 6, and a space between the paper feed roller 4 and the front paper feed roller 3 is attached. Hang the paper feed belt 2 over. Then, the sheet feeding belt 2, the front and rear sheet feeding rollers 3 and 4, and the rotating arm 6 form a belt conveying means 7 having a constant weight, and the belt conveying means 7 is placed on the stacked paper P and is always kept at a constant weight. The stacked sheets P are configured to be pressed.

However, when the paper is fed, even if the stacking amount becomes small, the paper bundle S is reliably sent to the shredder portion by the paper feeding belt 2 without being unable to be conveyed as described above.

[0008]

However, in such a paper feeding device, as shown in FIG. 7, for example, shredded paper having a relatively short length is stacked on the mounting table 5, and the belt is conveyed on the shredded paper. When the means 7 is placed, the rear side of the sheet feeding belt 2 may be placed on the placing table 5 depending on the loading height of the loaded sheets P. Therefore, when the sheet feeding belt 2 is driven in that state, the friction between the rear side and the mounting table 5 becomes a belt driving load, and therefore the sheet bundle cannot be smoothly conveyed from the stacked sheets P. Further, even when relatively long shredded sheets are stacked on the mounting table 5, if the stacking amount of the shredded paper becomes small, the rear side of the sheet feeding belt 2 is similarly placed on the mounting table 5.
In some cases, the stack of sheets cannot be smoothly conveyed from the stacked sheets P placed on top.

Therefore, an object of the present invention is to prevent the smooth conveyance of a stack of sheets by placing the rear side of the sheet feeding belt on the mounting table even when the number of remaining stacked sheets is short or the length thereof is short. To prevent.

[0010]

Therefore, the present invention provides
For example, as shown in the following illustrated embodiment, shredded paper sheets s are stacked, and the stacked paper sheets P are endless paper feed belt 30.
In the paper feed device of the shredder that drives the paper feed belt 30 to feed the stack of paper S from the stacked paper P to the shredder, and the mounting table 11 on which the stacked paper P is placed.
And a push-up means such as a push-up arm 15 for holding the uppermost sheet of the stacked sheets P on the mounting table 11 at the sheet feeding position,
The feeding belt 30 is provided between the rollers 20 and 21 to contact the uppermost sheet and is placed on the stacked sheet P. The belt conveying unit 60 is provided, and the center of the placing table 11 in the longitudinal direction. It is characterized in that the portion is formed high.

[0011]

In the present invention, when shredding is performed by the shredder, shredded paper s is loaded on the mounting table 11. And
The stacked sheets P are set on the mounting table 11 with the central portion in the length direction being highly curved. Then, the uppermost sheet on the mounting table 11 is held at the sheet feeding position by the pushing-up means, the sheet feeding belt 30 is brought into contact with the uppermost sheet, and the belt conveying means 60 is placed on the stacked sheet P. . Then, the sheet feeding belt 30 is driven to send the sheet bundle S from the stacked sheets P to the shredding section.

[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. FIG. 1 shows the configuration of the sheet transport system of the sheet feeding device, and FIG. 2 shows the configuration of the 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 FIG. 2). side)
To be installed.

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)
The mounting table 11 is provided.

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 mounting table 11 has a plate-shaped tray portion 11a and a hem portion 11b in which both sides of the tray portion 11a are bent downward, and a central portion in the lengthwise direction shown in FIG. Formed. Then, a support shaft 14 is provided on the rear end side (right end side in the figure) of the hem portion 11b, and is supported rotatably about the support shaft 14 between the side plates a and b. Then, the leading end side (the left end side in FIG. 1) of the tray portion 11a is placed on the mounting step portion 13
It is mounted on a and holds the mounting table 11 substantially horizontally.
Then, the paper presence / absence detecting means 17 is attached to the tray portion 11a. As the detecting means 17, for example, a micro switch or a photo sensor is used.

Further, the paper transport system is provided with a push-up arm (push-up means) 15 below the tip side of the tray portion 11a. 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 is connected to the side plates a and b.
It is fixed to the arm shaft 16 which is rotatably supported between the projections 1
5a is arranged upward on the lower side of the tray portion 11a.

Therefore, above the mounting table 11, the front paper feeding roller 20 is arranged on the front end side, and the rear paper feeding roller 21 is arranged on the rear end side. 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. Also, on the rear end side of the bent plate portion 24b,
The rear paper feed roller 21 is attached rotatably around a roller shaft 25.

After that, an endless paper feed belt 30 is stretched between the paper feed roller 21 and the front paper feed roller 20. Then, the paper feeding belt 30 and the both paper feeding rollers 20
The belt transporting means 60 having a constant weight is constituted by 21 and the rotating arm 24. Then, as shown in FIG. 1, when the shredded sheets are stacked on the mounting table 11, the sheet feeding belt 30 comes into contact with the edge portion 31 at the rear end of the stacked sheets P, and the belt conveying means 60 is stacked. It is placed on the paper P.

Further, in the above-described sheet conveying system, the upper conveying roller 34 is arranged in front of the front sheet feeding roller 20, 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 conveying roller 34 is the roller shaft 3
6 has a strong rigidity so as not to bend, and the lower transport roller 35 has a roller shaft 37 having elasticity.

By the way, in the above-described 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, penetrates both ends of the roller shaft 22 through bearings 43 into elongated holes 46 provided in the side plates a and b. And support it so that it can move up and down. Then, the bearing 43 is constantly urged downward by the urging spring 44 to be pressed against the edge of the elongated hole 46. On the other hand, the micro detection switch 45 is attached near the front paper feed roller 20 and inside the side plate b.
Then, the actuator 4 of the micro detection switch 45
5a is constantly pressed against the bearing 43.

Now, in FIG. 2, the drive system has a symbol A.
In addition to the mounting table drive means shown in FIG. 2 and the sheet feeding belt drive means B provided on the upper side, roller drive means C and D are provided in front of these drive means B and A, respectively.

The mounting table 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 sheet feeding belt driving means B includes a motor 51 and a gear train G ₂ that transmits the driving force of the motor 51 to the sheet feeding belt 30. The pulley 26 provided coaxially with one gear of the gear train G ₂
The drive transmission belt 27 is stretched between the pulleys 28 provided on the roller shaft 21. The roller driving means C includes a motor 52 and a driving force of the motor 52 for the upper conveying roller 3
A gear train G ₃ for transmitting to the four roller shafts 36 is provided. 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.

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

During use, the rotating frame 24 is rotated to a certain angular position to open the mounting table 11. Then, shredded sheets are stacked on the mounting table 11. Then, the stacked sheets P are set on the mounting table 11 with the central portion in the length direction being highly curved. Thereafter, the rotating frame 24 is returned, and the sheet feeding belt 30 is attached to the edge portion 31 at the rear end of the stacked sheets P.
Then, the belt conveying means 60 is placed on the stacked paper P in contact with. At that time, since the belt conveying means 60 is placed on the stacked paper P whose center portion in the lengthwise direction is highly curved, even when the length of the stacked paper P is short as shown in FIG.
The rear side of the sheet feeding belt 30 is held at a position apart from 1, and the rear side does not rest on the mounting table 11.

Then, a paper feed start switch (not shown) is turned on. Then, based on the detection signal indicating that there is a sheet in the sheet presence / absence detecting means 17, although not shown, the drive control means operates the motor 50 of the mounting table drive means A, and the driving force of the motor 50 is changed to the gear train G. _{In step 1} , the force is transmitted to the arm shaft 16 to rotate the push-up arm 15, and the push-up arm 15 rotates the mounting table 11 to push up the tip side thereof. When the leading end side of the stacked paper P is pressed against the front paper feed roller 20 via the paper feed belt 30, the actuator 45a moves slightly upward to turn on the micro detection switch 45, and the topmost paper P of the stacked paper P is loaded. Is detected at a predetermined height position. Then, based on the detection signal, the drive control means stops the operation of the motor 50 of the mounting table driving means A, and holds the mounting table 11 at the sheet feeding position of the predetermined height as shown in FIG. .

The motor 5 of the paper feeding belt driving means B
1, the driving force is transmitted through the gear train G ₂ and the drive transmission belt 27, the front sheet feeding roller 20 is rotated, and the sheet feeding belt 30 is driven. Further, 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 driving force to the gears. Row G
_The lower conveying roller 35 is rotated by the transmission by means of ₄ . Then, as shown in FIG. 4, the uppermost shredded paper sheet s is fed out from the stacked paper sheets P in the paper feed direction a by the paper feed belt 30.

When the uppermost first sheet s is fed out as described above, the sheet feeding belt 30 is in contact with the edge portion 31 at the rear end of the stacked sheets P, and as shown in an enlarged view in FIG. ,
Immediately, the second sheet s'is also contacted to start feeding the sheet.
When the second sheet is started to be fed, the sheet feeding belt 30 immediately contacts the third sheet to start feeding the sheet. And then
By repeating this, as shown in FIG. 6, the sheet bundle S having a step-like shape slightly shifted by one sheet is continuously fed out. Then, the sheet bundle S is transferred to the upper and lower transport rollers 34.
At 35, the paper is conveyed to the shredder of the shredder through the paper feed path 10.

[0031]

Therefore, according to the present invention, the sheet feeding belt, which is stretched between the plurality of rollers, is provided with the belt conveying means for contacting the uppermost sheet, and the belt conveying means is placed on the stacked sheets. Since the stacked sheets are always pressed with a constant weight, the stacked sheets do not become unusable even when the stacking amount is small. Therefore, regardless of the amount of stacked sheets, the sheet feeding belt can be used to stack the sheets. Can be reliably sent to the shredder.

Since the central portion of the mounting table in the length direction is formed to be high and the stacked sheets are set on the mounting table, the sheet feeding belt is used even when the stacked sheets are short or the length is short. This prevents the rear side of the stack from resting on the stacking table, which prevents the friction between the rear side of the paper feed belt and the stacking table from hindering the smooth conveyance of the stack of sheets during paper feeding. can do.

[Brief description of drawings]

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

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

FIG. 3 is an explanatory diagram of a sheet ready state of the sheet feeding device.

FIG. 4 is an explanatory diagram of a state immediately after the start of sheet feeding in the sheet feeding device.

5 is a partially enlarged view of the rear end side of the stacked sheets in FIG.

FIG. 6 is a state explanatory view showing a state in which a sheet bundle is sent out in a staircase pattern in which the sheets are slightly shifted one by one.

FIG. 7 is an explanatory view of a state in which short shredded sheets are stacked in FIG.

FIG. 8 is a schematic configuration diagram showing a paper feeding device of a conventional shredder.

FIG. 9 is a schematic configuration diagram showing another conventional paper feeding device of a shredder.

[Explanation of symbols]

 11 mounting table 15 push-up arm (push-up means) 20/21 front and rear sheet feeding rollers (roller) 30 sheet feeding belt 60 belt conveying means P stacked sheet S sheet bundle s shredded sheet

Claims (1)

[Claims] 1. A shredder for feeding shredded sheets, contacting an endless sheet feeding belt with the stacked sheets, and driving the sheet feeding belt to feed a sheet bundle from the stacked sheets to a shredder section. In the apparatus, a mounting table on which the stacked sheets are mounted, and a pushing-up unit that holds the uppermost sheet of the stacked sheets on the mounting table at a sheet feeding position,
And a belt transporting unit that hangs the paper feed belt between a plurality of rollers to contact the uppermost sheet and place the sheet on the stacked sheets, wherein the center of the placing table in the length direction is formed high. , Shredder paper feeder.