JP3202482B2 - Shredder paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder in a shredder which feeds paper to a shredder when, for example, a paper to be discarded is put into a paper feed port and a start switch is pressed.

[0002]

2. Description of the Related Art In a shredder, if the thickness of a sheet conveyed to the shredder is more than a predetermined value, the shredder is locked, and it is necessary to prevent this. Conventionally, each of the means described in the following publications is known as the prevention means.

[0003] A thickness detecting section for detecting the thickness of a sheet is provided in a sheet inserting section.
When the thickness of the sheet is equal to or more than a predetermined value, a warning device is activated to issue a warning, or the sheet conveying motor is stopped.

[0004] When a sheet exceeding the shredding capacity is forcibly inserted, it is determined by a microswitch that the paper feed belt conveyor is overloaded or that the sheet is not fed. Detects and stops or reverses the drive motor of the shredder body.

[0005]

However, these prior arts lock when the thickness of the paper exceeds a predetermined value. Therefore, in order to surely prevent such a problem from occurring, the cutting capability of the cutting section is required. On the other hand, the setting value of the paper thickness has to be considerably reduced, and there is a problem that the processing ability is poor.

Accordingly, it is an object of the present invention to improve the processing capacity by setting the set value of the paper thickness as close as possible to the cutting capacity of the cutting section.

[0007]

Therefore, according to the present invention, there is provided a first paper feeding means 26 which always drives forward and sequentially feeds stacked papers 16, and faces the first paper feeding means 26. A second paper feeding means 43 which forwardly drives the paper 16 sent out by the first paper feeding means 26 to directly transport the paper 16 to the shredding section or reversely transports the paper 16 in the reverse direction to return the paper 16;
Whether the thickness of the paper 16 sent out by the paper supply means 26 and the second paper supply means 43 is in the first state equal to or less than the first set value,
A sheet thickness detecting means for detecting whether the state is a second state exceeding the first set value and not more than the second set value, or a third state exceeding the second set value; The first
The second sheet feeding unit 43
And control means 57 for driving forward when detecting the second state and stopping when detecting the third state.

[0008]

When, for example, the paper 16 to be discarded is set and the start switch 56 is pressed, the first paper feeding means 2
6 and the second paper feeding means 43 is driven forward to feed out the paper 16. Then, the thickness of the fed sheet 16 is detected by the sheet thickness detecting means 50, and when the sheet 16 is in the first state, the first sheet feeding means 26 and the second sheet feeding means 43 are directly corrected by the control means 57. It drives and transports all of the fed paper 16 to the shredder. In the second state, the second paper supply unit 43 is stopped, the conveyance of the paper 16 in contact with the second paper supply unit 43 is stopped, and the remaining paper 16 is conveyed to the shredding unit. In the third state, the second paper supply means 43 is driven in reverse, the paper 16 in contact therewith is reversely transported, and the remaining paper 16 is transported to the shredding section.

[0009]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. 1 and 2 show a schematic configuration of a paper feeder of a shredder according to an embodiment of the present invention.

Reference numeral 17 in the figure denotes a loading table on which the paper 16 to be discarded is placed. A paper presence sensor 20 is provided on the loading table 17 on the left side in the figure.

As shown in FIG. 2, the paper presence sensor 20 includes a sensing lever 22 which is rotated by the paper 16 to be discarded.
And a light shielding plate 23 mounted coaxially with the sensing lever 22.
And a photocoupler 24 that is shielded from light by the light shielding plate 23.

A first paper supply means 26 and a second paper supply means 43 are disposed on the left side of the paper presence sensor 20 in FIG. The first paper supply means 26 supports a roller shaft 27 rotatably by being supported between a pair of side plates in the shredder main body 10, and a plurality of forward transfer rollers 28 are provided on the roller shaft 27. It becomes. A swing bearing base 29 is rotatably provided by being supported by the roller shaft 27. On the other hand, another roller shaft 30 is supported on the swing bearing base 29 and provided in parallel with the roller shaft 27. A plurality of paper feed rollers 31 are provided on the other roller shaft 30. Then, a belt 32 is wrapped around the one feed roller 31 and the one forward transfer roller 28.
Further, one of the pair of relay guide rollers 21 disposed apart from the first paper supply means 26 and the forward transfer roller
The belt 34 is also hung over one of the la 28. Then, the first motor 35 rotates the roller shaft 27, rotates the forward transfer roller 28, and feeds the feed roller 31 and the relay guide roller pair 21 via the belts 32 and 34. To rotate.

The oscillating bearing base 29 has a projection 29a.
Which is engaged with the push-up lever 39. The push-up lever 39 is provided with a feed-on / off switching electromagnet 40.
Turns clockwise or counterclockwise according to the on / off state of. The on / off of the electromagnet 40 causes the swing bearing base 2
Reference numeral 9 denotes a paper feed roller 3
1 is an upper retreat position where paper is not fed, and
Can be switched to a lower sheet feeding position where sheet feeding is performed. FIG. 1 shows a state at the retreat position.

On the other hand, the second paper supply means 43 is provided between the pair of side plates and rotatably provided with a roller shaft 44, and provided with a plurality of reversible rollers 45 on the roller shaft 44. Then, the roller shaft 44 is rotated by the second motor 46 capable of reversing forward and reverse, and the reversible roller 45 is rotated.

A paper thickness detecting means 50 is disposed between the first paper feeding means 26 / the second paper feeding means 43 and the relay guide roller pair 21. The sheet thickness detecting means 50 includes a sensing lever 51 which is pushed up by an amount corresponding to the thickness of the sheet 16 passing between the forward transfer roller 28 and the reversible roller 45,
A light-shielding plate 52 that rotates integrally with the sensing lever 51; and a light-emitting element 53 and a light-receiving element 5 that face each other with the light-shielding plate 52 interposed therebetween.
4 is provided. As shown in FIG. 1, an arc-shaped optical path window 55 having a narrow width on the right and a wide width on the left is provided at the tip of the light shielding plate 52, as shown in FIG. Then, the light transmission amount is changed according to the rotational displacement of the light shielding plate 52, and the output of the light receiving element 54 according to the received light amount is obtained.

FIG. 3 is a block diagram showing an electric configuration in this embodiment. The first motor 35, the second motor 46 and the electromagnet 40 are connected to a start switch 56 for starting a paper feeding operation, and the paper It is controlled by the control means 57 in accordance with signals from the presence / absence sensor 20 and the paper thickness detecting means 50.

FIG. 4 shows a flow of the control operation. First, in step S1, it is determined whether or not the paper 16 has been loaded on the loading table 17 based on a signal from the paper presence / absence sensor 20, and if it is determined that there is no paper, this is repeated until the paper 16 is loaded. If it is determined that there is paper, the process proceeds to step S2, where it is determined whether the start switch 56 is on. If not, the determinations of steps S1 and S2 are repeated.

When the start switch 56 is turned on, the flow advances to step S3 to determine the presence or absence of the paper 16 based on a signal from the paper presence / absence sensor 20.
Proceed to. The sheet thickness detecting means 50 determines whether the thickness of the sheet 16 is in the first state below the first set value, in the second state above the first set value and below the second set value, or in the second state. It is detected whether the state is the third state exceeding the set value. The paper 16
The paper thickness detecting means 50 before detecting the state is shown in FIG.

Immediately after the start switch 56 is turned on, the paper thickness detecting means 50 does not detect the paper 16, so it is in the first state of not more than the first set value, and proceeds to step 5. Then, the electromagnet 40 is turned on, and the first motor 35 and the second motor 46 are driven to rotate forward. Electromagnet 4
When 0 is turned on, the push-up lever 39 is rotated counterclockwise in FIG. 1 to lower the swing bearing base 29 as shown in FIG. Then, the first paper feeder 26 is driven forward to feed the stacked paper 16, and the second paper feeder 43 is also driven forward to transport the paper 16 sent out by the first paper feeder 26 as it is.

Then, when the paper 16 sent out by the first paper supply means 26 and the second paper supply means 43 is detected by the detection lever 51, the detection lever 51 is pushed from the state shown in FIG. 6 by an amount corresponding to the paper thickness. At the same time, the light-shielding plate 52 rotates clockwise to reach the state shown in FIG. Then, the light from the light transmitting element 53 is received by the light receiving element 54 through the optical path window 55,
The small output of the light receiving element 54 is obtained, and it is detected that the first state is equal to or less than the first set value. Then, when the first state is equal to or less than the first set value, the transport of all of the fed sheets 16 to the shredding unit 14 via the relay guide roller pair 21 is repeated.

If the thickness of the fed sheet is not in the first state below the first set value, the process proceeds to step 6 as shown in FIG. It is determined whether the state is the second state. At this time, as shown in FIGS. 8 and 9, when the light shielding plate 52 rotates more, the amount of received light increases, and the light output of the light receiving element 54 is obtained and detected. When it is detected that the second state is greater than the first set value and equal to or less than the second set value, the process proceeds to step S7, and the second motor 46 is stopped, as shown in FIG. Then, the conveyance of the paper 16 in contact with the reversible roller 45 is stopped, and the remaining paper 16 is conveyed to the shredding unit 14.

Further, the thickness of the fed sheet 16 is the first
When the light-shielding plate 52 pivots greatly to reach the state shown in FIGS. 10 and 11 instead of the second state exceeding the set value and being equal to or less than the second set value, the amount of received light further increases, and the large output of the light-receiving element 54 To obtain the third state exceeding the second set value. If it is detected that the third state is exceeded by exceeding the second set value, as shown in FIG.
8, the electromagnet 40 is turned off, and the second motor 46 is turned on in FIG.
Reverse driving is performed in the direction indicated by the arrow 0 in the middle. Then push up lever 3
9 is rotated clockwise, the swing bearing base 29 is pulled up, the paper feed roller 31 is separated from the paper 16, the paper 16 in contact with the reversible roller 45 is reversely conveyed, and the remaining paper 16 is sent to the shredder 14. Transport.

In steps S5, S7 and S8, the operation returns to step S3 and the same processing is repeated. If it is determined in step S3 that there is no paper, the process proceeds to step S9 to determine the elapse of a predetermined time, and after the elapse of the time, the process proceeds to step S10 to perform the electromagnet 40, the first motor 35, and the second motor 46. Is turned off and the process ends.

In the illustrated embodiment, the paper thickness detecting means 50 is disposed between the first paper feeding means 26 / second paper feeding means 43 and the relay guide roller pair 21, and the paper thickness detecting means 50 is Was detected directly to detect the paper thickness. But,
The sheet thickness detecting means 50 detects the sheet thickness by sensing the sheet thickness by the sensing lever 51 indirectly via the reversible roller 45 as shown in FIG. 12 and through one relay guide roller 21 as shown in FIG. It is good also as a structure which detects.

That is, in FIG.
8, the roller shaft 27 of the reversible roller 45 is flexible and the roller shaft 44 of the reversible roller 45 is made flexible so that the reversible roller 45 can be vertically displaced. The tip of a sensing lever 51 is engaged with the roller shaft 44 of the reversible roller 45.

FIG. 13 shows a relay guide roller pair 2
One of the roller shafts 33 is made of a material having flexibility, and one of the relay guide rollers 21 is displaceable.
The tip of a sensing lever 51 is engaged with the flexible roller shaft 33.

12 and 13, the sensing lever 51 detects that the reversible roller 45 is lowered according to the thickness of the sheet 16 pressed by the forward transfer roller 28. Thus, with the configuration shown in FIGS. 12 and 13, the sheet feeding device 13 can be further reduced in size.

[0028]

According to the present invention, the thickness of the fed sheet is detected by the sheet thickness detecting means, and when the sheet is in the first state by the control means, the first sheet feeding means and the second sheet feeding means are intact. The paper means is driven forward to convey all of the fed paper to the shredding section, and when in the second state, the second paper feeding means is stopped, the conveyance of the paper in contact with it is stopped, and the remaining paper is stopped. The sheet is conveyed to the shredding section, and when the sheet is in the third state, the second sheet feeding means is driven in reverse to convey the sheet in contact therewith and the remaining sheet is conveyed to the shredding section. Therefore, the following effects are obtained. It is possible to positively suppress the transport of a sheet having a thickness exceeding the set value into the shredded section before the sheet, and to prevent locking of the shredded section in advance. The thickness of the paper to be sent to the shredding unit is brought close to the shredding capacity limit of the shredding unit, so that more sheets can be smoothly transported, and the processing capacity can be increased. Since a large number of sheets are cut at one time, the bulk after shredding can be reduced as compared with the case where the sheet is divided into a small number of sheets and shredded several times.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a paper feeder of a shredder according to an embodiment of the present invention, viewed from a direction orthogonal to a paper transport direction.

FIG. 2 is a perspective view thereof.

FIG. 3 is a block diagram illustrating an electrical configuration of the sheet feeding device.

FIG. 4 is a flowchart illustrating a control operation of the sheet feeding device.

FIG. 5 is a state explanatory diagram showing a state in which the paper thickness detecting means detects that the sheet is in a first state equal to or less than a first set value.

FIG. 6 is a state explanatory view showing a state before paper detection by the paper thickness detecting means.

FIG. 7 is an enlarged view of the paper thickness detecting means shown in FIG.

FIG. 8 is a state explanatory view showing a state in which the paper thickness detecting means detects that the sheet is in a second state exceeding a first set value and not more than a second set value.

FIG. 9 is an enlarged view of the paper thickness detecting means.

FIG. 10 is a state explanatory view showing a state in which the sheet thickness detecting means has detected that the sheet has exceeded a second set value and is in a third state.

FIG. 11 is an enlarged view of the paper thickness detecting means.

FIG. 12 is a side view of another embodiment of the sheet feeding device of the present invention, viewed from a direction orthogonal to a sheet conveying direction.

FIG. 13 is a side view of still another embodiment, viewed from a direction orthogonal to a sheet conveying direction.

[Explanation of symbols]

 16 paper 26 first paper feeding means 43 second paper feeding means 50 paper thickness detecting means 57 control means

Claims (1)

(57) [Claims] A first paper feeder which always drives the paper feeder to sequentially feed the stacked papers; a first paper feeder provided opposite to the first paper feeder; A second paper feeding means for directly transporting the paper to the cut portion or reversely transporting the paper in a reverse drive direction, and the thickness of the paper fed by the first paper feeding means and the second paper feeding means is set to a first set value. The first state below, or the second state above the first set value and below the second set value;
Paper thickness detecting means for detecting whether the state is a third state exceeding a second set value, and when the paper thickness detecting means detects the first state, the second paper feeding means is driven forward. Control means for stopping when detecting the second state and reversely driving when detecting the third state.