JPH02149355A - Paper shredder - Google Patents

Abstract

PURPOSE:To carry out regular and reverse rotation of a one-way rotating motor by installing a manual reverse rotation means having a reverse rotation component installed on a drive transfer means for driving a shredding cutter driven in the reverse direction and control electrically the driving means in accordance with the regular and reverse rotation positions of the operation of said reverse rotation means. CONSTITUTION:Driving force is generated in one direction in order to rotate and drive a paper shredding cutter 1 in driving means 23 and 51. Drive transfer means 24-30, transfer driving force to the cutter 1 in the shredding pieces of paper based on the connection with said driving means, and the cutter 1 is rotated in the regular rotation direction. Further, reverse rotation components 31 and 34 for driving the cutter 1 manually are interposed in said drive transfer means for a manual reverse rotation means 43. A position sensing means 44 senses the regular rotation position or the reverse rotation position by the operation of the manual reverse rotation means 43, while a control means controls electrically said driving means by the sensing state of a position sensing means 44. As a result, the regular and reverse rotations of the cutter can be carried out by using a one-way rotation motor.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a document shredding device for shredding documents into indecipherable pieces, and in particular, a document shredding device that drives a shredding cutter in forward or reverse rotation. Regarding a shredding device for.

<Prior Art> In general, a shredding mechanism for shredding documents into small pieces is composed of a pair of cutter rollers that rotate with each other, or a combination of a rotating cutter and a fixed cutter. The latter shredding mechanism is based on Utility Model Publication No. 51-45585.
As disclosed in the publication, it is composed of a rotary cutter having a spiral blade and a fixed cutter provided in pressure contact with the spiral blade.

In the above-mentioned shredding mechanism, the cutter is rotated in the opposite direction as necessary. For example, if an overload occurs when shredding with a cutter, the overload can be detected by detecting the load current of the motor that drives the cutter.
The above motor is stopped. Thereafter, in order to remove the document that has stopped midway, it is necessary to drive the cutter in the reverse direction.

To achieve this, a motor capable of forward and reverse rotation is used as the drive motor.

<Problems to be Solved by the Invention> Here, in order to rotate the cutter in the forward or reverse direction, by using a motor that can rotate forward or reverse, the motor can be stopped by detecting an overload as described above, and to retrieve the document,
Such a motor can easily be reversed.

However, the above-mentioned motor that can rotate forward and reverse,
It is expensive and cannot be used in inexpensive document shredding devices. Therefore, it is desired to use an inexpensive motor that rotates in only one direction.

According to this, when it is necessary to take out a document in a state where the motor has stopped due to overload state detection, the document can be taken out directly by the child. In this case, since the driving force is transmitted from the drive motor to the cutter via a means for transmitting it, for example, a large number of gears, the transmitting means and the cutter itself are forced to be driven. There is a risk that problems such as breakage or damage may occur.

Moreover, if the motor rotates in one direction, it is not possible to drive the cutter in the reverse direction when the cutter needs to be rotated in the reverse direction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a document shredding device that can rotate a cutter forward or reverse by using a motor that rotates only in one direction with a simple reversing mechanism. In particular, it is an object of the present invention to provide a simple reversal mechanism that prevents damage to the transmission means, etc. when forward or reverse rotation of the cutter is transmitted via the transmission means from the motor.

Means for Solving Problems> The document shredding device of the present invention has a structure in which a driving force is transmitted to the shredding rotary cutter from a drive means that rotates in one direction via a drive transmission means. A manual reversing means is provided in which a reversing member is interposed in the drive transmission means so that the cutter for use is driven in the opposite direction, and the driving means is energized in response to detection of a normal rotation position or a reverse rotation position of the operation of the manual reversing means. It is characterized by a control configuration.

<Function> According to the document shredding device of the present invention, the cutter is moved in the shredding direction (
The cutter can be driven in the reverse direction by rotating the cutter in the normal rotation direction, or by interposing a reverse rotation member in the drive transmission means. In this case, the motor will stop due to overload,
In order to remove a document that has stopped midway, the cutter can be reversed to easily remove the document.

Further, the drive motor is energized according to the detected state of the normal rotation position or the reverse rotation position related to the operation of the manual reversing means. That is, since the reversing member is driven by detecting the state in which it is interposed in the transmission means, the reversing member and the like can be prevented from being forced to connect. Therefore, damage caused by the transmission means including the reversing member etc. can be prevented.

<Embodiment> FIG. 1 is an external perspective view showing a driving portion of a document shredding device according to the present invention, and FIG. 2 is a sectional view showing the structure of the document shredding device according to the present invention.

First, referring to FIG. 2, an overview of the entire document shredding device will be explained. The document shredding device 50 includes a vertical cutting cutter means 60;
The shredding portion is constituted by the transverse cutter means 61 in the present invention. At the bottom of the input lower 0 for inputting documents, a vertical cutter means 60 is disposed, and a transverse cutter means 61 is disposed further below the vertical cutter means 60. The document input from the input lower 0 is first cut into long lengths by the action of the vertical cutter means 60, and then shredded into chips by the action of the transverse cutter means 61.

The shredded debris is discharged and collected into a shredded debris storage section 71 located at the bottom of the document shredder 50.

The vertical cutter means 61 is composed of a pair of cutter members 62 and 63 in which metal circular blades 64 having a thickness of 1 to 3 mm and resin molded spacers 65 are alternately provided. The circular blades 64 are cut into long pieces by rotating the circular blades 64, which are provided at intervals of approximately 3 to 8 mm and facing each other by spacers 65, in contact with each other. In particular, the cutter members 62 and 63 are rotatably driven by shafts 66 and 6, 7.
Circular blades 64 and spacers 65 are inserted alternately into the blades 64 and are arranged so that the circular blades 64 are in contact with each other. and,
The circular blade 64 is attached to rotate as the shafts 66 and 67 rotate.

Further, the transverse cutter means 6I is composed of the rotary cutter l and the fixed cutter 16 shown in FIGS. 2 and 3. In particular, the fixed cutter [6] is rotatably supported by a shaft portion 17, and its cutting edge is pressed in the direction of the rotary cutter 1 by a biasing means (not shown) such as a spring.

As shown in FIG. 4, the rotary cutter 1 is comprised of a cutter part 3 having a spiral blade 4 and a cylindrical part 2 for rotatably holding the rotary cutter 1. This rotary cutter 1 cuts two pieces of cylindrical metal at the cutter part 3.
A spiral groove 5 is provided. The diameter of the cylindrical part 2 and the diameter of the cutter part 3 are substantially the same. In addition, in the cutter part 3, the width 121 of the groove 5 and the interval ρ between the grooves,
is determined as follows. Since a long document inserted into the groove 5 is shredded in combination with a fixed cutter, it is better to make the width of the groove 5 as long as possible so that more documents can fit into the groove 5 for better shredding efficiency. Become. On the other hand, if the width of the groove 5 is too long, the strength of the rotary cutter will be weakened, which is not preferable. Therefore, 0.8≦C, /
The grooves may be formed so that ρ2≦3.0.

Moreover, as shown in FIG. 41.42 (see Figure 1) and is rotatably held. In addition, as shown in FIG. 3, a drive gear 2 for rotating the rotary cutter l is provided.
1 is fixed to the end of the cylindrical part 2 of the rotary cutter l,
It meshes with the rotation transmission gear 22. The details of this drive will be explained later. Also, the shaft 1 of the fixed cutter 16
7 is rotatably held between the frames 41 and 42, and is rotated by the urging force of a spring or the like.
is pressed against.

In the shredding mechanism configured as described above, when a long document to be shredded is placed between the rotary cutter I and the fixed cutter I6 while the rotary cutter I is being rotated, a portion of the document is It enters the groove 5 of the rotary cutter 1 and is then shredded into chips by the spiral blade 4 of the rotary cutter and the fixed cutter 16.

The rotary cutter 1 having a spiral blade is made of the same material as a drill used for drilling work. for example,
It is created by forming one or more grooves in a cylindrical metal such as carbon steel or alloy steel. The rotary cutter 1 is provided with a groove to constitute a part of the cutter, and the optimum number of grooves varies depending on the diameter of the metal. If the number of grooves is increased with a small diameter item, there is a risk that sufficient strength will not be obtained and it will break. Furthermore, if the number of grooves is reduced with a large diameter one, the shredding efficiency will not be good.

Therefore, in the case of a cylindrical metal having a diameter of 8 to 40 mm, the number of threads is preferably 1 to 6, preferably 2 to 4. Also,
This rotary cutter is comprised of a cutter part with a groove formed therein and a cylindrical part without a groove formed therein. In addition, when the number of grooves is 2, the depth of the groove is 1 of the diameter of the cylindrical metal.
/2 to 1/4 is preferred. If the grooves are made too deep, the strength of the rotary cutter will be weakened and there is a risk of damage.On the other hand, if the grooves are made too shallow, it will be difficult for long documents to fit into the grooves, resulting in poor shredding efficiency. In addition, since it is made of cylindrical metal, a portion of the cutter and the cylindrical portion are integrally formed, which increases mechanical strength and has the same outer diameter. Further, the helix angle between the rotating shaft of the rotary cutter and the spiral blade is preferably 5 to 50 degrees, preferably 15 to 35 degrees.

The rotation of the rotary cutter I and the cutter members 62 and 63 by the circular blade 64 is performed by the drive motor 51. In this case, the ratio of each gear constituting the driving force transmission means is selected so that the circumferential speed of the rotary cutter 1 is faster than the circumferential speed of the circular blade 64. When the circumferential speed of the rotary cutter 1 placed at the bottom of the circular blade is made slower than the circumferential speed of the circular blade 64, the cutter rises to the vertical cutter between the vertical cutter 60 and the horizontal cutter 61 and is shredded into long pieces. The document is bent, and as a result, it becomes difficult to insert the document into the groove 5 of the rotary cutter l, and the transverse cutter cannot efficiently shred the document.

Therefore, specifically, the circumferential speed of the rotary cutter 1 is 50-2
00 mm/sec, the circumferential speed of the circular blade 64 is lO~100
It is preferable to set it as mm/sec. The drive motor 51 is driven and controlled by a switch provided on an operation section (not shown) or a document detection switch (not shown) provided near the document input lower 0.

Next, with reference to FIG. 1, the driving of the circular blade 64, rotary cutter 1, etc. will be explained. The drive motor 51 is, for example, a shaded motor that is driven to rotate in one direction, and when energized, that is, driven, it is connected directly to the rotating shaft 23 (directly formed integrally with the rotating shaft 23) and is connected to a transverse gear. 231 transmits rotation to the spindle gear 24. The Haba gear 24 has a normal gear 24 coaxially therewith. is provided, and transmits rotation to the gear 25 via the gear 24. Also, the gear 25 is coaxially connected to the gear 25. is provided, and this gear 251
The rotation is transmitted to the gear 26 via the gear 26. Further, a gear 26. which is coaxial with the gear 26. transmits rotation to the gear 27 for driving the rotary cutter 1. A gear 27 coaxial with the gear 27. In Fig. 2, the cutter member 6 on the left side is
A gear 28 fixed to one end of the shaft 66 on the second side is engaged, and this gear 28 is engaged with a gear 29 fixed to the end of the shaft 67 on the cutter member 63 side.

On the other hand, a gear 30 is further meshed with the gear 26,
Rotation is transmitted to the rotary cutter 1 according to the invention via a shaft 40 to which the gear 30 is fixed. Such a shaft 40 is connected to a frame 41. /12 is rotatably supported. Therefore, a transmission gear 22 is fixed to the end of the shaft 4o opposite to the gear 30 fixed to the end of the shaft 40. The transmission gear 22 meshes with a drive gear 21 fixed to the shaft of the rotary cutter l, that is, the cylindrical portion 2 of the rotary cutter l. Therefore, when the rotary cutter l rotates clockwise in the figure as the drive motor 51 rotates (counterclockwise), the shafts 66, 67 of the cutter members 62, 63 move in the direction of shredding documents. are rotated respectively.

As described above, the rotational force of the drive motor 51 is transmitted to the shaft 6667 of the rotary cutter 1 and the cutter member 62, 63 through the rotation transmission means consisting of a large number of gears.

The gears 27, 27. and gears 24, 24. , are rotatably supported on the frame 42 side of the shredding device 50. Further, the shafts 66 and 67 are rotatably provided between the frames 41 and 42 via bearings. Also, gear 25
．． 25. The gear 26261 is rotatably provided on the swinging member 31 which is rotatably supported on the frame 42 and is used for manual reverse drive.

Next, the reverse rotation drive according to the present invention will be explained.

The swinging member 31 is rotatably supported by a shaft 32 attached to a frame 42, and the gears 26, 26, . is rotatably supported. Therefore, even if the swinging member 31 rotates, the gear 26. and gear 2
7 will never be disengaged. This swinging member 31 has a spring 33, a frame 42 and a swinging member 31.
Since the gear 241 and the gear 25 are interposed between the gear 241 and the gear 25, the gear 241 and the gear 25 are always urged in the direction in which they mesh. Therefore, normally, rotation is transmitted to the drive motor 51 in the normal direction.

Further, as shown in FIG. 2, the operating surface of the document shredding device 50 is provided with a reverse manual operation section 43 for driving the shredding cutter in the reverse direction when overloaded. A portion of the reverse manual operation section 43 protrudes from the operation surface of the document shredding device 50, and the other end is connected to an end opposite to the shaft 32 of the swinging member 31. Therefore, the swinging member 31 is rotated clockwise against the spring 33 by pressing the reverse manual operation section 43 .

The swinging member 31 further includes a protruding piece 31. A reversing gear 34 meshing with the gear 25 is rotatably supported. The reversing gear 34 is located in a corresponding relationship with the gear 243, and is arranged to mesh with the gear 241 when the swinging member 31 rotates clockwise.

By providing a manual reverse transmission means with the above structure,
When the reverse manual operation section 43 is pressed down, the rotation of the swinging member 31 causes the gear 24, which is a transmission means for transmitting the rotational force of the drive motor 51. and the gear 25, as shown in FIG. 5(b).
As shown in the figure, a reversing gear 34 is interposed. As a result, the rotational force on the rotary cutter 1 and the circular blade 64 (collectively referred to as the cutter) acts in the opposite direction, so even if the drive motor 51 rotates in the same direction, the cutter will act in the opposite direction to the shredding direction. direction.

Furthermore, when the operation section 43 is released, the spring 33
Due to the action of , the swinging member 31 returns to its original position, and the fifth
As shown in Figure (a), the reverse gear 34 is disengaged from the drive transmission means for normal rotation. Therefore, when the drive motor 51 is driven (energized), each cutter is driven to rotate in the shredding direction.

Here, by pressing the reverse manual operation section 43, the swinging member 3
1 is rotated clockwise and the reversing gear 34 is interposed in the drive transmission means, the drive motor 51 is driven (energized).
need to be controlled. For example, when a document shredding cutter is overloaded, the drive motor 5I is forcibly de-energized. In addition, due to other factors,
It becomes necessary to reverse the cutter. In this case, the drive motor 51 is connected to the gear 24. of the reverse gear 34. If it rotates during connection (intervention) with the gear, the connection will be forced and the impact will damage other gear groups, including the reversing gear, and even the cutter.

For this purpose, the position of the swinging member 31 is detected, and energization of the drive motor 51 is controlled in accordance with this detection. When detecting the position of the swinging member 31, that is, when driving the cutter in normal rotation, the gear 24, which is a drive transmission means, is used. and 25 are engaged, and in the case of reverse drive, the reverse gear 34
It is necessary to detect the meshing position of the gear 241 and the gear 241. Therefore, as shown in FIGS. 5(a) and 5(b), two protrusions 31t and 31s are formed on the swinging member 31, and each protrusion 31. , 313, a microswitch 44 for position detection is fixedly arranged on the frame 42.

As described above, the microswitch 44 is in the forward rotation position (gear 24 and 25
are engaged), the operating piece 441 of the microswitch 44 is pressed by the convex portion 31t, and when the manual reverse operation section 43 is pressed down, the reverse operation position (reverse gear 34
and the gear 24 are in mesh with each other), the operating piece 44° of the microswitch 44 is pressed by the convex portion 313. Therefore, the microswitch 44 is activated when the convex portion 3L,
31. At actuating piece 44. Since the pressure on is released, the contact opens.

The microswitch 44 has a contact point 44° at the sixth point.
As shown in the figure, it is connected to the drive circuit of the motor 51. In the figure, the drive motor 51 is connected to the power supply switch SW
The circuit configuration is such that power A, C, and power are supplied through the contact 442. In particular, the switch SW may be considered to have a configuration in which its contacts close (ON) due to suppression, maintain that state, and return to the open state (OFF) when, for example, motor overload is detected.

In addition, the switch SW is turned ON when it is pressed manually.
L. It may be a simple switch that turns off when the pressure is released. In this case, another contact point for de-energizing the motor 51 upon overload detection is separately provided in the energizing circuit.

In the circuit diagram shown in FIG. 6, when the document is to be shredded by the cutter, the reverse manual operation section 43 is in a non-pressed state as shown in FIG. 5(a), and the microswitch 44 detects this state. The contact point 44. is closed. Therefore, if the power switch SW is pressed, the drive motor 5I
is energized, the cutter is rotated in the forward direction, and the document is shredded.

If it becomes necessary to drive the cutter in the opposite direction due to detection of an overload condition or other factors, the reverse manual operation section 43 is pressed down. At this time, the contact 44 of the microswitch 44. opens, and the drive motor 51 is temporarily stopped (already stopped in the overload detection state). This pressing is continued, and when the reverse gear 34 engages with the gear 24, the contact 44 of the microswitch 44. is closed, and power supply to the drive motor 51 is started (with the switch SW in the ON state).

In the device shown in FIG. 5, since the position of the swinging member 31 is detected by one switch, when the drive motor 51 is energized during reverse rotation, the power supply switch SW must be turned OFF. For example, the drive motor 51 cannot be driven in the reverse position. Therefore, in order to drive the drive motor 51 more efficiently in the normal rotation position or the reverse rotation position, microswitches 45 and 46 for detecting the respective positions may be provided as shown in FIG.

The microswitches 4, 5, 46 are fixed to the frame 42 so as to be operated by a protrusion 314 provided on the swinging member 31. The microswitch 45 is a switch for detecting a normal rotation position, and the microswitch 46 is a switch for detecting a reverse rotation position.

Further, FIGS. 8(a) to 8(c) show a specific example in which the stroke of the reverse manual operation section 43 is increased, thereby ensuring detection of the forward rotation or reverse rotation position. One end of the manual reverse operation section 43 is connected to the swinging member 31 via a return spring 47 which is smaller in force than the urging force of the spring 33. A convex portion 43.
is formed, and the microswitch 45 is fixedly arranged at a predetermined position so that the microswitch 45 is operated by this convex portion 431.

Therefore, as shown in FIG. 8(a), when the reverse manual operation section 43 is not pressed down, the forward rotation detection microswitch 45 is activated by the protrusion 43.
, and detects the normal rotation position. The return spring 47 is compressed while the reverse manual operation section 43 is pressed down, and the rotation of the swinging member 31 is restricted until the compression is completed. At this time, Fig. 8(b)
As shown in the figure, the microswitch 45 has a convex portion 43. further away, and the normal rotation position is not detected. However, in this state, the microswitch 46 does not detect the reverse position.

Furthermore, when the reverse manual operation part 43 is pressed down, the return spring 47 is compressed to the final extent, and the swinging member 31 is then rotated, so that the protrusion 314 is rotated as shown in FIG. 8(c). The microswitch 46 is operated to detect the reverse position.

FIG. 9 shows the drive motor 5 in a position detection state using the microswitches for detecting each position in FIGS. 7 and 8.
1 shows a specific example of the No. 1 energization control circuit. In the figure, the switch SW is similar to the circuit in FIG.
A contact point 45 of a microswitch 45 that detects the normal rotation position is connected in series to this switch SW. is connected to the drive motor 51
A, C.

Supply power. Further, a contact 461 of the microswitch 46 for detecting the reverse position is connected in parallel to a series circuit of the switch SW and the contact 451.

According to the above circuit configuration, if the reverse position is detected by the microswitch 46, 2. Regardless of the switch SW,
The cutter can be rotated in the reverse direction by energizing the drive motor 51. In particular, the switch SW is turned off due to overload detection.
Even in this state, by pressing the reverse manual operation section 43, the cutter can be reversed and the document being shredded can be easily removed. Moreover, as in the example shown in FIG.
The microswitch 45 detects this in the middle of pressing down, and after completely cutting off the power to the drive motor 51, the swinging member 31 is rotated, and the microswitch 46 is in the reverse position.
Since the drive motor 51 is energized only after it is detected by
It is possible to reliably prevent reverse rotation during rotation, and prevent damage to gears, etc.

In the above embodiments, a document shredding device having a vertical cutter and a horizontal cutter has been described, but the present invention can be carried out even if only a vertical cutter or only a horizontal cutter is provided.

<Effects> According to the present invention, even if a motor for driving a shredding cutter is used that rotates only in one direction,
The cutter can be driven in reverse, making it easy to remove documents that have stopped shredding midway through overload. Moreover,
Since the drive motor can be energized when the forward rotation position or the reverse rotation position is detected, rotation is transmitted in a reliable connection state while avoiding forced connection, so damage to the transmission member, cutter, etc. can be prevented.

Therefore, a very inexpensive drive motor can be used, and the cost of the document shredding device can be reduced.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing the details of the driving part of the document shredding device according to the present invention, Fig. 2 is a sectional view showing the document shredding device showing the overall structure of the present invention, and Fig. 3 is a transverse cutter. FIG. 4 is a front view showing an example of a rotary cutter, and FIGS. 5(a) and 5(b) show a specific example of energization control of a drive motor according to the present invention. 6 is a circuit diagram showing a specific example of the drive motor energization control in FIG. 5, FIG. 7(a)(b) and FIG. 8(a)
9 to 8(c) are configuration diagrams showing other specific examples for controlling the energization of the drive motor according to the present invention, and FIG.
FIG. 3 is a circuit diagram related to energization control of the drive motor in the figure. ■... Rotating cutter, 16... Fixed cutter 23.
...Motor rotating shaft, 24-30...Transmission gear 3I...
- Swinging member, 34... Reverse gear, 43... Reverse manual operation section, 44.4-5.46... Micro switch, 62.6
3... Cutter member. Agent Patent attorney Takeshi Sugiyama (1 other person) Figure 5 Figure 6 Figure 9

Claims (1)

[Claims] 1. In a document shredding device that shreds documents by rotating a cutter for shredding documents, a drive that generates a driving force in one direction to rotate the cutter for shredding. means, a drive transmission means connected to the drive means for transmitting driving force to the shredding cutter in the direction of shredding documents, and rotating the shredding cutter in the normal rotation direction; a manual reversing means in which a reversing member for driving the shredding cutter in the reverse direction is interposed in the drive transmission means; a position detecting means for detecting a normal rotation position or a reverse rotation position by operating the manual reversing means; A document shredding device comprising: a control means for controlling energization of the drive means according to a detection state of the position detection means.