JP3236584B2 - Paper shredder - 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 sheet shredding device (shredder) for shredding waste documents and the like, and more particularly to an opening width of a guide path following an insertion port for inputting paper sheets.

[0002]

2. Description of the Related Art A paper shredding device is a device for shredding documents and the like in order to maintain confidentiality of the documents and the like to be discarded.
In a general sheet shredding device, a document or the like is input from an input port and sent to a rotating cutter through a guide path following the input port. In the rotating cutter, the paper sheet is passed between two rotating blades meshing with each other, and the paper sheet is cut into a line having a width of several millimeters in the vertical direction. Further, depending on the paper sheet shredding device, the one shredded in the vertical direction is further shredded in the horizontal direction by a rotating spiral cutter and a fixed flat cutter.

In such a paper sheet shredding apparatus, it is preferable that an opening width of a guide path following an inlet satisfies the following plural requirements.

(1) There is no possibility that a user's finger or the like accidentally touches the cutter.

(2) It is possible to simultaneously supply the maximum number of sheets or the thickness of the sheets that can be shredded, and to limit the excessive supply of the sheets to the cutter exceeding the maximum number of sheets.

(3) The paper sheets supplied to the cutter and partially shredded are returned in the reverse direction, and are safely and easily discharged from the inlet 2 through the guide path 130.

According to the requirement (1), it is necessary to narrow the opening width without making it wider than necessary.

According to the above (2), it is necessary to set an appropriate opening width that does not excessively exceed the thickness of the maximum number of pieces that can be shredded, which is determined according to the capabilities of the cutter, the driving motor, and the like.

[0009] Since the partially shredded paper sheets are thicker than the thickness before shredding, in order to easily discharge the paper sheets, according to the requirement (3), the opening width is required. Need to be as wide as possible.

As described above, the plurality of requirements (1) to (3) are mutually contrary requirements.

[0011]

However, as shown in FIG. 4, the conventional guideway 130 following the inlet 2 has a constant opening width d from the inlet side to the cutter side. Was.

For this reason, conventionally, only the above requirements (1) to (3) have been set so as to partially satisfy the requirements in a well-balanced manner. Could not be fully satisfied individually.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to individually satisfy a plurality of requirements imposed on the opening width of a guide path following an inlet. It is to provide.

[0014]

In order to achieve the above object, a sheet shredding apparatus according to the present invention feeds a sheet from an input port and feeds the sheet to a rotating cutter through a guide path following the input port. In the sheet shredding device for shredding, the guide path and the input port are formed so that papers can be returned to the input port via the guide path, and from the input port side to the cutter side. The opening width in the feeding direction of the guide path, which is an opening width through which sheets can pass, is larger than the opening width in the return direction of the guide path, which is an opening width through which sheets can pass from the cutter side to the input port side. It is characterized by being formed narrow.

[0015] An opening width switching means for switching the opening width of the guide path between the opening width in the feed direction and the opening width in the return direction in accordance with the moving direction of the paper sheet is provided.

The opening width switching means is rotatable around a fulcrum in a direction in which the opening width of the guide path is increased by receiving a return force acting from the cutter side to the insertion port side. It has a gate lever which cannot rotate around the fulcrum upon receiving a feed force acting on the cutter side from a mouth side.

Further, the gate lever has a return lever portion capable of receiving the return force, and the fulcrum is located closer to the cutter than the return lever portion.

Further, the gate lever is urged in a direction against the rotation about the fulcrum upon receiving the return force.

Further, the opening width switching means has a stopping means for stopping and maintaining the gate lever so that the opening width in the feeding direction does not become smaller than the thickness of the maximum number of sheets that can be cut. I do.

An opening is formed in a wall surface forming the guide path so that the gate lever can protrude into the guide path and can retreat from the guide path. I do.

Further, the gate lever has a U-shaped cross section.

Further, the present invention is characterized in that a safety switch is provided which prohibits the cutter from rotating in a forward direction, in which the paper sheets can be cut when the opening width of the guide path is wider than the opening width in the feeding direction.

In the above-mentioned invention, the opening width in the feeding direction of the guide path, which is the opening width through which the paper sheets can pass from the insertion port side to the cutter side, is changed from the cutter side to the insertion port side. Is formed to be narrower than the opening width in the return direction of the guide path, which is an opening width through which the vehicle can pass, so that it is possible to individually satisfy a plurality of requirements imposed on the opening width of the guide path.

The opening width of the guide path can be switched by the opening width switching means between the opening width in the feed direction and the opening width in the return direction in accordance with the moving direction of the paper sheet. .

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a paper sheet shredding device according to the present invention will be described below with reference to the drawings.

As shown in FIG. 5, an input port 2 for inputting paper sheets to be cut is provided on an upper surface of the main body 1 of the paper sheet shredding apparatus. I have. Two cutter rollers 3 and 4 are provided so as to mesh with each other diagonally below the lower end of the guide path 30.

The paper sheets inserted from the input port 2
It is sent to cutter rollers 3 and 4 through 0. As shown in FIG. 6, the cutter rollers 3 and 4 have rotating shafts 5 and 6 with disk-shaped cutter blades attached at equal intervals. Further, a horizontal cutter device 7 is provided below the meshing portion of the cutter rollers 3 and 4. This horizontal cutter device 7
Is composed of a spiral cutter 8 having a spiral blade and a flat cutter 9. As shown in FIG. 7, the spiral cutter 8 has a shaft 10 provided with a spiral cutter blade 11. In addition, the flat cutter 9 has a flat cutter blade 19 at the tip end, for example, having a triangular cross section.

Cutter rollers 3, 4 and spiral cutter 8
Is driven and rotated by a motor 13. A gear 12 is coaxially attached to the motor 13, and a driving force of the motor 13 is transmitted by the gear 12 to a gear 14 disposed coaxially with the cutter roller 3 to drive the cutter rollers 3 and 4. Further, the rotation of the gear 12 is transmitted to a gear 15 disposed coaxially with the rotation shaft 10 of the spiral cutter 8, and the spiral cutter 8 is driven. The motor 13 has an output of about several hundred watts.

When a sheet is inserted from the insertion port 2, the sheet input sensor detects this and the motor 13 is automatically started.
Thereby, the cutter rollers 3 and 4 and the spiral cutter 8 rotate. The inserted paper sheets are cutter rollers 3 and 4.
Thereby, for example, it is cut in the longitudinal direction into a linear shape having a width of about 3 mm to 6 mm. The linearly shredded paper sheets are guided into the horizontal cutter device 7 and further cut short in the horizontal direction. The trimming length is determined by the number of revolutions of the spiral cutter 8 and is about 10 mm to 35 mm. The paper sheets (shredded scraps) thus finely cut fall into a scrap container 16 provided at a lower portion of the apparatus.

In the sheet shredding device described above, according to the present invention, in the vicinity of the guide path 30, an opening width switching for switching the opening width d of the guide path 30 in accordance with the moving directions A and B of the sheets. Means 40 are provided. Here, the moving direction A is a direction in which the paper sheets move from the insertion port 2 side to the cutter rollers 3 and 4 side, and the moving direction B is a paper sheet moving from the cutter rollers 3 and 4 side to the insertion port 2 side. Direction.

Hereinafter, the aperture width switching means 40 will be described in detail with reference to FIGS.

The guide path 30 is composed of an upper panel 31 and a lower panel 32 disposed in parallel with each other with an interval of width d2.

The opening width switching means 40 is provided with a gate lever 41 having a U-shaped cross section for switching the opening width d of the guide path 30 in accordance with the moving directions A and B of the paper sheets.

The gate lever 41 has a feed-side lever portion 41a on the side of the input port 2 having a cross section of "C" and a return section on the side of the cutter rollers 3 and 4 having a cross section of "C". It has a side lever portion 41b and a stop portion 41c located at the tip end of a feed side lever portion 41a that determines the position of a regular gate lever 4 that can shred paper sheets.

The upper panel 31 has an opening 31a. A gate lever 4 is provided near the lower end of the opening 31a.
A fulcrum 42 is formed as a center at which 1 rotates. The fulcrum 42 is closer to the cutter roller 3 than the return side lever portion 41b.
Located on the 4th side. The gate lever 41 is biased by a spring in a direction against turning around the fulcrum 42 in a counterclockwise direction.

The gate lever 41 pivots counterclockwise about the fulcrum 42 and can protrude into the guide path 30 through the opening 31a. The gate lever 41 pivots clockwise about the fulcrum 42 and rotates in the opening 31a. Can be withdrawn from the guideway 30 via the.

In the vicinity of the upper end of the opening 31a, the driving conditions of the cutter rollers 3, 4 are restricted according to whether the gate lever 41 is at the position shown in FIG. 2 or the position shown in FIG. A safety switch 44 is provided.

Next, the relationship between the moving direction of the paper sheet 50 and the operation of the gate lever 41 will be described with reference to FIGS.

Since the gate lever 41 is biased by a spring so as to rotate clockwise around the fulcrum 42, the sheet shredding device can regularly shred the sheet as shown in FIG. In the state shown. In this state, the stop portion 4 of the gate lever 41
1c hits the upper end of the opening 31a and is kept stopped.

In the state shown in FIG.
Is that the opening width d of the guide path 30 is d1, and this opening width d
Is referred to as a feed direction opening width d1. This feed direction opening width d1
From the input port 2 side to the cutter rollers 3 and 4 side.
Is an opening width that can pass through, and in the state shown in FIG.
The opening width d1 in the feed direction is set, for example, substantially equal to the thickness of the maximum number of shredable sheets so as not to be smaller than the thickness of the maximum number of shredable sheets.

When the paper sheet 50 is sent from the insertion port 2 to the cutter rollers 3 and 4, the leading end of the paper sheet 50 hits the feed side lever portion 41 a of the gate lever 41, and the feed force is applied to the feed side lever portion 41 a. The gate lever 41 rotates around the fulcrum 42 because the rotation moment acting on the feed-side lever 41a by the feed force is counterclockwise and the stop 41c is stopped at the upper end of the opening 31a. The paper sheet 50 is sent to the cutter rollers 3 and 4 via the guide path 30 without being rotated clockwise or counterclockwise, and is cut there.

In the gate lever 41 shown in FIG. 2, the stop 41c is in contact with the upper end of the opening 31a, and unlike the case shown in FIG. 3, the stop 41c is set so that the safety switch 44 is ON. Absent. In this case, the safety switch 44 does not function, and the cutter rollers 3 and 4 are in a state in which the cutter rollers 3 and 4 can be driven to rotate forward, reverse, or stop according to the operation display of the main switch (not shown).

As described above, when the gate lever 41 is in the state shown in FIG. 2, the opening width d1 in the feeding direction is set to, for example, the maximum number of sheets that can be shredded so as not to be smaller than the thickness of the maximum number of sheets that can be shredded. Is set to be substantially equal to the thickness of the paper sheet 50, it is possible to restrict the excessive supply of the paper sheet 50 to the cutter rollers 3 and 4. Also, since the thickness of the maximum number of sheets that can be shredded is usually smaller than the size of a finger or the like, the user's finger or the like is mistakenly
4 can be eliminated.

Next, the case where the gate lever 41 is in the state shown in FIG. 3 will be described.

FIG. 3 shows a case where the paper sheet 50 that has been partially shredded is returned in the moving direction B. The partially shredded paper sheet 50 is thicker than before shredding. To return from the cutter rollers 3 and 4 to the insertion port 2 side, the guide path 30
Is set as follows in the return direction opening width d2 which is wider than the feed direction opening width d1. Here, the opening width d2 in the return direction is an opening width through which the paper sheet 50 can pass from the cutter rollers 3 and 4 to the insertion port 2 side.

When the paper sheet 50 is sent from the cutter rollers 3 and 4 to the slot 2, the leading end of the paper sheet 50 hits the return lever portion 41b of the gate lever 41, and the return force is applied to the return lever portion 41b. To give a return moment to the return lever portion 41b around the fulcrum 42, and the gate lever 41 rotates clockwise around the fulcrum 42. Here, the return force acting on the return side lever portion 41b is the stop portion 4
1c acts in a direction away from the upper end of the opening 31a. Then, the stop portion 41c that has hit the upper end portion of the opening 31a moves until the stop portion 41c hits the switch portion of the safety switch 44, and the distance between the projecting point of the intermediate portion of the gate lever 41 and the lower surface panel 32 increases. The opening width d is set to the return direction opening width d2.

In this case, the stop 41c is connected to the safety switch 44.
Is set to ON, the safety switch 44 functions,
Forward rotation driving in which the cutter rollers 3 and 4 are driven in a direction in which paper sheets are drawn into the cutter rollers 3 and 4 from the insertion port 2 side is prohibited. And in the state shown in FIG.
Even if a hand or finger is inserted into the guideway 30 from the side and the forward rotation is erroneously instructed by the main switch, the cutter rollers 3 and 4 do not perform forward rotation and secure the safety of the hand and finger. can do.

As described above, when the gate lever 41 is in the state shown in FIG. 3, the opening width D of the guide path 30 has been changed to the return direction opening width d2 which is wider than the feed direction opening width d1, and therefore, The paper sheet 50 whose thickness has been increased by the partial shredding can be easily and safely returned to the inlet 2 side.

As described above, according to the embodiment of the present invention, the opening width of the guide path 30 is changed according to the moving direction of the paper sheet 50, and the opening width d1 in the feeding direction can be shredded. For example, the thickness of the maximum number of sheets that can be shredded is set to be approximately equal to the thickness of the maximum number of sheets that can be cut so as not to be smaller than the thickness of the number of sheets. Can be restricted, and the user's fingers can be prevented from accidentally touching the cutter rollers 3 and 4. In addition, when returning the paper sheet 50 to the insertion slot 2, the guide path is used. 30 is wider than the opening width d1 in the feed direction and can be changed to the opening width d2 in the return direction. Can be returned to

In the above description, the case where the opening 31a for projecting or retracting the gate lever 41 is formed in the upper panel 31 has been described.
It is also possible to form an opening in the lower panel 32 for projecting or retreating, and set the fulcrum 42 on the lower panel 32 side.

[0051]

As described above, according to the structure of the present invention,
Feeding direction opening width of the guide path, which is the opening width through which the sheets can pass from the input port side to the cutter side, and return direction of the guide path, which is the opening width through which the sheets can pass from the cutter side to the input port side. Since it is formed narrower than the opening width, it is possible to individually satisfy multiple requirements imposed on the opening width of the guideway, eliminating the possibility that the user's fingers etc. will accidentally touch the cutter, Excessive supply of paper sheets to the cutter exceeding the number or thickness can be restricted, and the paper sheets supplied to the cutter and partially shredded can be safely and easily discharged from the input port. be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an opening width switching means of a paper sheet shredding device according to the present invention.

FIG. 2 is a cross-sectional view illustrating an operation state of a gate lever constituting an opening width switching unit of the paper sheet shredding device according to the present invention.

FIG. 3 is a cross-sectional view illustrating another operation state of the gate lever constituting the opening width switching means of the paper sheet shredding device according to the present invention.

FIG. 4 is a cross-sectional view showing the vicinity of a guide path of a conventional sheet shredding device.

FIG. 5 is a diagram showing the upper inside of the paper sheet shredding device.

FIG. 6 is a view showing a pair of cutter rollers.

FIG. 7 is a view showing a spiral cutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet shredding apparatus main body 2 Input port 3, 4 Cutter roller 30 Guide path 31 Upper panel 32 Lower panel 40 Opening width switching means 41 Gate lever 41a Feed side lever part 41b Return side lever part 41c Stop part 44 Safety switch 50 Paper Leaves d Guideway opening width d1 Feeding direction opening width d2 Returning direction opening width

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Nakajima 239, Onishi, Onishi-cho, Tano-gun, Gunma Prefecture Sakae Co., Ltd. (72) Inventor Kiyoshi Yamaguchi 239, Onishi, Onishi-machi, Tano-gun, Gunma, Inc. Inside Sakae (56) References JP-A-63-88056 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B02C 18/00-18/44

Claims (9)

(57) [Claims] 1. A sheet shredding device for feeding a sheet through an inlet and feeding and shredding the sheet to a rotating cutter via a guide path following the inlet, wherein the guide path and the inlet are provided with the guide. Through the road
The paper type is formed to be able to return to the entrance, and the opening width in the feeding direction of the guide path, which is the opening width through which the paper sheets can pass from the input port side to the cutter side, is equal to the input side from the cutter side. A sheet shredding device, wherein the sheet shredding device is formed to be narrower than a return direction opening width of the guide path, which is an opening width through which sheets can pass to the mouth side. 2. An apparatus according to claim 1, further comprising an opening width switching means for switching the opening width of the guide path between the opening width in the feed direction and the opening width in the return direction in accordance with the moving direction of the paper sheet. Item 6. The paper sheet shredding device according to Item 1. 3. The opening width switching means is rotatable around a fulcrum in a direction in which the opening width of the guide path is increased by receiving a return force acting from the cutter side to the loading port side. The sheet shredding device according to claim 2, further comprising a gate lever that is not rotatable around the fulcrum upon receiving a feeding force acting on the cutter side from a mouth side. 4. The apparatus according to claim 3, wherein the gate lever has a return lever portion capable of receiving the return force, and the fulcrum is located closer to the cutter than the return lever portion. A sheet shredding device according to claim 1. 5. The sheet shredding device according to claim 3, wherein the gate lever is urged in a direction against rotation about the fulcrum under the return force. . 6. An opening is formed in a wall surface forming the guide path so that the gate lever can protrude into the guide path and can retreat from the guide path. The sheet shredding device according to claim 3. 7. The paper sheet shredding device according to claim 3, wherein the gate lever has a V-shape in cross section. 8. The opening width switching means includes stop means for stopping and maintaining the gate lever so that the opening width in the feeding direction does not become smaller than the thickness of the maximum number of sheets that can be cut. The sheet shredding device according to claim 3. 9. The apparatus according to claim 1, further comprising a safety switch for prohibiting the cutter from rotating forward when the width of the guide path is larger than the width of the feed direction. Item 6. The paper sheet shredding device according to Item 1.