JP5037844B2 - Shredder cutter structure - Google Patents

Description

  The present invention relates to a cutter structure of a shredder that shreds, for example, non-paper sheets (hereinafter referred to as shredded objects) such as paper and documents, and particularly suppresses noise generated during shredding processing. The present invention relates to a cutter structure of a shredder that can be made smaller.

For example, Patent Document 1 is known as a conventional shredder cutter structure, in particular, a cutter blade.
The cutter described in Patent Document 1 has a plurality of identically shaped blades arranged alternately and repeatedly in the rotational direction with a plurality of identically shaped notch recesses on the outer periphery. Is made larger than the length of the notch recess, and the cut object is cut into a fine strip shape.
Japanese Utility Model Publication No. 62-156351

  However, the cutter of the shredder described in Patent Document 1 has an arc shape in which the outer peripheral surface of the blade is concentric with the rotation center of the cutter, and when the shredded object is shredded between the cutters of this shape The portion in front of the cutter of the shredded object is greatly shaken in the front-rear direction by both cutters, which is a major cause of noise generation.

  The present invention has been made to solve the conventional problems as described above, and at the stage of cutting the object to be shredded, the portion in front of the cutter of the object to be shredded is moved forward and backward by the cutter. An object of the present invention is to provide a shredder cutter structure that can suppress noise generated during shredding by reducing the amplitude of the shredder.

According to the present invention, the above problem is solved as follows.
(1) A pair of rotating shafts each having a plurality of substantially disk-shaped cutters arranged in a row are provided, and the blades of the cutters in the other rows are arranged between adjacent cutters in each row. In a shredder cutter structure, wherein the cutters are arranged parallel to each other and rotated in opposite directions in a state where the adjacent cutters in both rows are slid together, the cutters are arranged on the outer peripheral surface. and a blade and cutout recess, to together provided so as alternately towards the rotating direction, a rake angle δ eggplant blade and the front side surface of the blade with respect to a line connecting the rotation center and the edge of the mosquito jitter When 20 ° ≦ δ ≦ 30 ° and the blade edge angle β of the blade is 35 ° ≦ β ≦ 40 °, the angle formed by the extension line of the edge surface on the outer edge of the blade and the edge surface on the side away from the blade edge α is set within the range of 15 ° ≦ α ≦ 25 °, and the blade edge angle β of the blade is 40 ° ≦ β When the 45 ° sets the angle alpha in the range of 5 ° ≦ α ≦ 15 °.

(2) In the above item (1), a concave portion is provided at the center of the outer end face of the blade, which is recessed toward the center of rotation with respect to the virtual outer peripheral circle passing through the blade edge of the cutter in a side view.

(3) In any of the above (1) or (2) of the bottom surface of the cutout recess, so as to be positioned on the virtual yen forming a substantially concentric with a virtual outer peripheral circle passing through the cutting edge of the cutter in a side view form To do.

  According to the first aspect of the present invention, at the stage of cutting the shredded object, the portion of the shredded object in front of the cutter can reduce the amplitude that is swung in the front-rear direction by the cutter. Noise generated during processing can be suppressed.

According to the second aspect of the present invention, since the concave portion that is recessed toward the rotation center side than the virtual outer peripheral circle that passes through the blade edge of the cutter in a side view is provided in the central portion of the outer end surface of the blade , The width of the portion in front of the cutter that is swung by both cutters and moved in the front-rear direction can be further reduced.

According to the third aspect of the invention, the bottom surface of the cutout recess, so is formed so as to be positioned on the virtual yen forming a substantially concentric with a virtual outer peripheral circle passing through the cutting edge of the cutter in side view and cut The movement in the front-rear direction of the object to be shredded immediately after can be suppressed to reduce noise.

  The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a shredder provided with an embodiment of the cutter structure of the present invention, FIG. 2 is a longitudinal side view, and FIG. 3 is an operating state by upper and lower guide plates that similarly form an insertion passage at the insertion port. It is a principal part expansion vertical side view which shows roughly.

  As shown in FIGS. 1 and 2, the shredder (1) includes a case body (2) made of a vertically long bottomed box-like body having a short front-rear dimension and a long left-right dimension. The case main body (2) has an upper surface and a front surface that are open, and the interior is partitioned into housing spaces (2a) and (2b).

  The shredding unit (3) is detachably assembled in the upper housing space (2a) in the case body (2). The shredding unit (3) has an upper surface cover (5) provided with an operation panel (4) at the front. An input port (6) through which the object (A) is input is provided. The insertion port (6) is followed by an insertion passage (7) that is inclined downward at a predetermined angle toward the rear of the case body (2).

  The insertion passage (7) is formed by a pair of upper and lower guide plates (8) and (9), and a bent portion (7b) is formed at the lower end of the first passage portion (7a) and the first passage portion (7a). ) Through the second passage portion (7c).

The upper guide plate (8) is fixed to the upper surface cover (5), and as shown in FIG. 3, the base end portion (8a) that forms the first guide surface that becomes the upper surface of the first passage portion (7a). And a distal end portion (8b) that forms a second guide surface serving as an upper surface of the second passage portion (7c), and the distal end portion (8b) extends from the first passage portion (7a) to the second passage portion ( 7c) For the purpose of guiding the tip of the shredded object (A) that is inserted downward, and when a hard object exceeding its capacity, such as a plastic plate or a metal plate, is inserted, insert it. in suppression purposes so as to form a bent portion of the insertion path (7) (7b), are allowed to bend or curve downward.

The lower guide plate (9) includes a base end portion (9a) that forms a first guide surface that is a lower surface of the first passage portion (7a), and a second guide surface that is a lower surface of the second passage portion (7c). The end (9c) on the inlet (6) side is pivotally attached to the top cover (5) with the shaft (10), and the end (9b) side tilts downward. It is attached freely. The tip portion (9b) of the lower guide plate (9) cooperates with the tip portion (8b) of the upper guide plate (8) so that the second passage portion (7c) expands rearward and downward. As shown, it is bent so as to hang down almost directly below.

  Between the lower guide plate (9) and the upper guide plate (8), an interval (a) is formed for forming an insertion passage (7) that can be inserted in a state where several sheets of paper are stacked. As described above, the base end portion (9a) is arranged in parallel with the base end portion (8a) of the upper guide plate (8), and is attached upward by the leaf spring (11) so as to maintain this distance (a). It is energized. Also, on the lower surface side, a foreign object or a thick object such as cardboard exceeding the interval (a) of the insertion passage (7) is inserted from the insertion port (6), and the lower guide plate (9) of the leaf spring (11) is inserted. A thick object detection sensor (12) comprising a limit switch is provided for detecting the movement of the lower guide plate (9) due to the tilt when tilted downward (in the direction of the arrow) against the urging force.

  Below the insertion passage (7), a pair of chopping rollers (13a) (13b) at the rear and the front are arranged in mesh with each other. Here, the relationship between the meshing portion (B) between the chopping rollers (13a) and (13b) and the insertion passage (7) is as shown in FIG. 3 from the tip portion (8b) of the upper guide plate (8). The extension line (C1) extending straight diagonally rearward and downward is set so as to be displaced rearward by a slight distance (x) with respect to the center of the meshing part (B).

  As shown in FIG. 3, the chopping rollers (13a) and (13b) are disk-shaped cutters (15a) and (15b) that are mounted on the rotary shafts (14a) and (14b) at regular intervals. is there. A plurality of blades (16) and cutout recesses (17) are provided on the outer peripheral surface of each cutter (15a) (15b) so as to be alternately repeated in the rotation direction.

Further, as shown in FIGS. 5 and 6, the blade tip angle (β) of the blade (16) is 35 ° ≦ β ≦ 55 °, and the line connecting the rotation center (O) of the cutters (15a) (15b) and the blade tip. The rake angle (δ) of the blade with the surface on the near side of the blade is 20 ° ≦ δ ≦ 40 °, the extension line of the end surface on the outer edge of the blade (16), and the end surface on the side away from the blade edge Is set to be within a range of 5 ° ≦ α ≦ 35 °.

At the center of the outer end surface (16a) of the blade (16) in the cutter (15a) (15b), as clearly shown in FIG. 6, the blade (16) of the cutter (15a) (15b) in a side view. A concave portion (28) recessed in a U-shape is provided on the rotation center (O) side of the virtual outer circumference circle (27) passing through the cutting edge of the blade, and the bottom surface (17a) of the notch concave portion (17) The cutter is located on the virtual circle (29) of the cutter (15a) (15b) concentric with the virtual outer circle (27) .

  Further, as shown in FIG. 6, the radius of the virtual outer circumference circle (27) passing through the cutting edge of the cutter (15a) (15b) is (R1), and the virtual circle (29) passing through the bottom surface (17a) of the notch recess (17). (R2) and the connection radius between the bottom surface (17a) of the notch recess (17) and the front surface of the cutter (15a) (15b) blade (16) is (R3). The radius (R3) is set within a range of 1/3 to 2/3 of the difference between the radius (R1) and the radius (R2).

  The blades (16) and the cutout recesses (17) of the cutters (15a) and (15b) in the respective rotary shafts (14a) and (14b) are provided so as to be opposite to each other as shown in FIGS. . Further, as shown in FIG. 4, the pair of rotating shafts (14a) and (14b) is arranged between the other rotating shaft (14b) between the cutters (15a) and (15a) in the cutter row of one rotating shaft (14a). The cutters (15b) and (15b) blades (16) in the cutter rows of the cutters are alternately inserted into and parallel to each other, and a forward / reversible motor (18) disposed below the top cover (5) is provided. When driven forward, the adjacent cutters (15b) (15b) in both rows rotate in opposite directions, and the shredded object (A) is shredded. ing.

  In the lower housing space (2b) in the case body (2), a waste storage box (C) for storing shredded waste discharged from the shredded portion is housed in a removable manner from the front opening (2c). ing. On the upper surface of the bottom of the lower storage space (2b), a waste storage box detection sensor (19) comprising a limit switch is installed. The waste storage box detection sensor (19) has a waste storage box (C) at a fixed position. It is detected whether it is located in.

The upper portion of the case body (2), the first fall detection sensor (20a) is likewise, in the center of the bottom, a second fall detection sensor (20b) are installed respectively, the first fall detection sensor ( 20a) is a highly accurate and reliable sensor that operates with slight vibrations and shocks, such as a non-contact pendulum type switch in which the built-in photosensor is turned on and off by rolling the ball. The initial fall state of the case body (2) is detected. On the other hand, the second fall detection sensor (20b) is composed of, for example, a rod sensor, and operates when the case body (2) is inclined, for example, about 20 degrees or more. It is designed to detect accurately.

  A door (21) is provided on the front surface of the case body (2) so that it can be opened and closed. The open / closed state of the door (21) is a limit provided in the vicinity of the door hinge (21a) of the case body (2). It is detected by a door opening detection sensor (22) comprising a switch. The door open detection sensor (22) stops the operation of the motor (18) of the drive unit when the door (21) is open, and allows the motor (18) to be driven when the door (21) is closed. Operates as follows.

  As shown in FIG. 1, a pair of left and right paper sensors (23), (23) for detecting the insertion state of the shredded object (A) in the width direction of the insertion passage (7) at the insertion port (6). Is installed. As shown in FIGS. 2 and 3, each sheet sensor (23) includes a light projecting element (24a) provided on the upper guide plate (8) and the lower guide plate (9) so as to face each other. It consists of a light receiving element (24b).

  On the operation panel (4), as shown in FIG. 1, button switches (25) such as a start / restart button (25a), a reverse button (25b), a stop button (25c), etc. There is an LED display lamp group (26) for displaying OFF, during operation or stop, with thick material, full of waste storage box, open door / no waste storage box, motor overheating, and the like.

Next, the operation of this shredder will be described.
When the object to be shredded (A) is thrown from the slot (6), this is detected by the two paper sensors (23) and (23), the motor (18) is driven to rotate forward, and the shredder roller ( 13a) and 13b are rotated. As shown by the arrow (D) in FIG. 3, the shredded object (A) thrown from the slot (6) slides on the lower guide plate (9) at the slot (6). Proceed through the first passage (7a). When the distal end reaches the second passage portion (7c), it comes into contact with the distal end portion (8b) of the upper guide plate (8), and then slidably contacts the lower surface of the distal end portion (8b) while the second passage portion ( 7c) Proceed backwards and downwards. When leaving the second passage portion (7c) , it proceeds toward the meshing portion (B) as it is and enters the meshing portion (B).

  As shown in FIG. 7, the shredded object (A) bitten in the meshing part (B) is bitten between the cutters (15a) and (15b), and the tip of the shredded object (A) For example, as shown in FIGS. 7A to 7J, the portion is drawn between the cutters 15a and 15b while being swung back and forth along the outer ends of the cutters 15a and 15b. .

Here, in the structure of the present embodiment, the edge angle (β) of the blade (16) of the cutter (15a) (15b) is set to 35 ° ≦ β ≦ 55 °, and the rotation center of the cutter (15a) (15b) (O ) And the front edge of the blade with respect to the line connecting the blade edge, the rake angle (δ) of the blade is 20 ° ≦ δ ≦ 40 °, the extension line of the edge surface on the outer edge of the blade and the side away from the blade edge. The angle (α) formed with the end face is set within a range of 5 ° ≦ α ≦ 35 °, and a recess (28) is provided at the center of the outer end face (16a) of the blade (16), so that a notch recess (17 ) Is positioned on the virtual circle (29) of the cutter (15a) (15b) in a side view, so that the cover bitten between the cutters (15a) (15b) The shredded material (A) has a smaller width that is swung along the outer edges of the cutters (15a) and (15b), suppresses the sound generated during shredding processing, is shredded with a small sound, and is strip-shaped. Is cut.

  The blade (16) of the cutters (15a) and (15b) has a connection radius (R3) set within a range of 1/3 to 2/3 of the difference between the radius (R1) and the radius (R2). Therefore, the object to be cut (A) is well bitten, the cut object (A) is not likely to be cut poorly, and the cut object (A) cut into a strip shape is removed from the notch recess (17). It is easy to come out, and this makes it possible to always maintain good cutting performance.

  The shredded roller (13a) (13b), which is a shredded portion, is loaded with the shredded object (A) exceeding the maximum shredded number, and when the shredded portion is overloaded, it is automatically reversed. It returns toward the 2nd channel | path part from a shredded part. At this time, in the structure of the present embodiment, an extension line (C1) that extends straight obliquely downward from the front end portion (8b) of the upper guide plate (8) is provided between the chopping rollers (13a) and (13b). Since the engagement portion (B) is slightly rearwardly shifted by a distance (x) with respect to the engagement center (B), the second passage portion (7c) is configured to expand rearward and downward, so that it is reversed. The object to be cut (A) can be easily taken out without being caught on the upper and lower guide plates (8) and (9).

  The width of the shredded object (A) caught between the cutters (15a) and (15b) of the present invention is reduced along the outer peripheral surface of the cutters (15a) and (15b). The following verification tests 1 to 3 were performed in order to confirm the actions and effects that can suppress and reduce the generated sound.

(Verification test 1)
First, when the cutting edge angles (β) of the cutters (15a) and (15b) are 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, their sharpness and durability In order to verify the above, a verification test 1 was conducted. As shown in FIG. 8, the test results showed that both the sharpness and durability were in the practical range when the blade edge angle (β) was in the range of 35 ° to 60 °. In addition, the symbol of sharpness and durability in FIG. 8 decreases as it goes to the symbol ◎ → ◯ → Δ → x, respectively, and x indicates that it is out of the practical range.

(Verification test 2)
Subsequently, sharpness, edge angle (beta) of 35 ° each in the range of practical durability both, 40 °, 45 °, 50 °, 55 °, and 60 °, and recess angles of (28) Verification test 2 was conducted to verify the noise level when (α) was 5 °, 15 °, 25 °, 35 °, and 40 °. As shown in FIG. 9, the test results showed that both the sharpness and noise were in the practical range when the angle (α) was in the range of 5 ° to 35 °. Note that the noise symbol in FIG. 9 decreases as it goes to the symbol →→ ○, and “−” indicates that the rake angle (δ) is out of range.

(Demonstration test 3)
Subsequently, the sharpness of the cutters (15a) and (15b) when the rear angle (θ) of each blade is 15 °, 20 °, 25 °, 30 °, 35 °, 40 °, 45 °, 50 °. Then, a verification test 3 was conducted to verify the durability. As shown in FIG. 10, the test results showed that the sharpness was in the practical range when the blade rear angle (θ) was in the range of 15 ° to 50 °. Note that the sharpness symbol in FIG. 10 decreases as it goes from symbol 記号 → ◯ → Δ.

(Demonstration test 4)
Subsequently, the rake angles (δ) are set to 15 °, 20 °, 25 °, 30 °, 35 °, 40 °, and 45 °, respectively, and each cutting edge of the cutter (15a) (15b) is set as shown in FIG. The radius of the virtual circumference circle that passes through (R1), the radius of the virtual circle that passes through the bottom surface of the notch recess (17) (R2), the bottom surface (17a) of the notch recess (17) and the blades of the cutter (15a) (15b) ( When the connection radius between the front surface of 16) is (R3), the clogged state of the connection radius (R3), that is, the recess R value of the notch recess (17) was verified. As shown in FIG. 11, the test results show that the recess R value is not clogged in the range of 0.8 ≦ R ≦ 3, the biting into the cut object (A) is good, and the cut of the cut object (A) is performed. It has been found that defects are less likely to occur, and the strips (A) cut into strips are likely to come out of the notch recesses (17), so that good cutting performance can always be maintained. Note that the clogging symbol in FIG. 11 decreases as it goes to the symbol →→ ◯ → Δ, respectively, and “−” indicates that it cannot be performed.

The concave portion R value (connection radius (R3)) is expressed as follows in relation to (R1) and (R2).
R (0.8) = 0.5 / 3 (R1-R2)
R (1.5) = 1/3 (R1-R2)
R (2.3) = 1.5 / 3 (R1-R2)
R (3) = 2/3 (R1-R2)
R (3.8) = 2.5 / 3 (R1-R2)
That is, 0.8 ≦ R3 ≦ 3 can be expressed by the following formula.
[(R1-R2) / 3≤R3≤ (R1-R2) /1.5]

Therefore, from the above demonstration tests 1 to 4, the edge angle (β) of the blade (16) is 35 ° ≦ β ≦ 55 °, the rake angle (δ) is 20 ° ≦ δ ≦ 40 °, and the angle (α) is 5 °. If ≦ α ≦ 35 °, the width of the shredded object (A) swung along the outer edges of the cutters (15a) and (15b) is reduced without reducing sharpness and durability. It has been found that the effect of suppressing and reducing the sound generated during processing can be obtained. Also, if the connection radius (R3) is set within the range of [(R1−R2) / 3 ≦ R3 ≦ (R1−R2) /1.5], the notch recess (17) will not be clogged and good cutting performance will always be achieved. It was found that it can be maintained.
In addition, since all the examples were measured by varying the angle in units of 5 °, actually, even in the range of ± 2 ° to 3 ° from the limit value of the angle described in the claims. Similar results were obtained.

It is a perspective view of a shredder provided with one embodiment of the present invention. Similarly, it is a vertical side view. Similarly, it is a principal part expansion vertical side view which shows roughly the operation state by the up-and-down guide plate which forms the insertion channel | path in an insertion port. Similarly, it is a schematic plan view showing a pair of chopping rollers. Similarly, it is an enlarged view showing the shape of a pair of cutters. Similarly, it is the principal part enlarged view of a cutter. Similarly, it is a figure which shows the operation | movement which a pair of shredding roller shreds a to-be-chopped thing. Similarly, it is a figure which shows the relationship between the sharpness of blade edge angle, and durability. Similarly, it is a figure which shows the relationship between the noise of a blade edge | tip angle, a square-shaped angle, and sharpness. Similarly, it is a figure which shows the relationship between a blade rear side angle and sharpness. Similarly, it is a figure which shows the clogging relationship of a rake angle and a recessed part R value.

(1) Shredder
(2) Case body
(2a) Upper housing space
(2b) Lower housing space
(2c) Opening
(3) Shred unit
(4) Operation panel
(5) Top cover
(6) Slot
(7) Insertion passage
(7a) First passage
(7b) Bending part
(7c) Second passage
(8) Upper guide plate
(8a) Base end
(8b) Tip
(9) Lower guide plate
(9a) Base end
(9b) Tip
(9c) End
(10) axis
(11) Leaf spring
(12) Thick object detection sensor
(13a) Shredded roller
(13b) Shredded roller
(14a) Rotating shaft
(14b) Rotating shaft
(15a) Cutter
(15b) Cutter
(16) Blade
(16a) Outer end face
(17) Notch recess
(17a) Bottom
(18) Motor
(19) Waste container detection sensor
(20a) First fall detection sensor
(20b) Second fall detection sensor
(21) Door
(21a) Door hinge
(22) Door open detection sensor
(23) Paper sensor
(24a) Emitting element
(24b) Light receiving element
(25) Switches
(25a) Start / Restart button
(25b) Reverse button
(25c) Stop button
(26) LED display lamp group
(27) Virtual circumference circle
(28) Recess
(29) Virtual circle
(A) Shredded material
(B) Meshing part
(C) Waste storage box
(D) Arrow
(a) Interval
(x) Deviation amount
(O) Center of rotation
(α) Angle between extension line and end face
(β) Cutting edge angle
(δ) Rake angle
(θ) Blade rear angle

Claims (3)

A pair of rotating shafts each having a plurality of substantially disk-shaped cutters arranged in a row, and the blades of the cutters in the other rows are alternately arranged between the adjacent cutters in each row. In the cutter structure of the shredder that is arranged in parallel with each other and rotates in the opposite direction to each other in a state where the adjacent cutters in both rows are slid together,
The cutter, on the outer peripheral surface, the blade and the cutout recess and together provided so as alternately towards the rotating direction, mosquitoes jitter rotational center of the blade with respect to a line connecting the cutting edge of the front side of the When the rake angle δ of the eggplant blade is set to 20 ° ≦ δ ≦ 30 ° and the blade edge angle β of the blade is set to 35 ° ≦ β ≦ 40 °, the extension line of the end surface on the outer edge of the blade is separated from the blade edge. When the angle α formed with the end face on the side is set within a range of 15 ° ≦ α ≦ 25 ° and the blade edge angle β of the blade is 40 ° ≦ β ≦ 45 °, the angle α is 5 ° ≦ A cutter structure of a shredder, which is set within a range of α ≦ 15 ° . The cutter structure of a shredder according to claim 1, wherein a concave portion is provided at a central portion of the outer end face of the blade, which is recessed toward the center of rotation with respect to a virtual outer peripheral circle passing through the blade edge of the cutter in a side view. The bottom surface of the cutout recess, according to any of claims 1 or 2, characterized in that formed so as to be positioned on the virtual yen forming a substantially concentric with a virtual outer peripheral circle passing through the cutting edge of the cutter in a side view Shredder cutter structure.

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