JPH02152557A - Document shredder - Google Patents

Abstract

PURPOSE:To obtain the document shredder which widens the conditions for use and is improved in shredding efficiency by providing switching means for switching the windings for rotating a shredding motor according to shredding conditions. CONSTITUTION:The intermediate taps of the windings 2 of the shredding motor 1 are led out as switching terminals 4A, 4B, 4C in order to switch the shredding capacity. A power source 5 is supplied to the windings 2 via a power supply switch 3 and the winding switching means 4. The number of the paper which can be simultaneously shred by the shredder and the time when the shredding can be continuously executed are determined by the output torque of the shredding motor 1 and the temp. rise of the shredding motor 1, respectively. The output torque and the temp. rise are determined by the current (i) flowing in the shredding motor 1. Any of the switching terminals 4A to 4C is selected and switched according to the conditions of use. For example, all the operator has to do is to select the switching terminal meeting the conditions of use displayed in the table. Namely, the switching terminal 4C to increase the max. number of the sheets to be shred is merely selected if the number of the paper to be shred is small. The selection of the switching terminal 4A to execute continuous use suffices if a large amt. of the paper to be shred exists.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a document shredding device for shredding documents into unreadable pieces, and particularly relates to drive control of shredding force, vines, etc. .

<Prior art> In general, a shredding mechanism for shredding documents into fine pieces consists of a pair of cutter rollers that rotate together, or a rotary cutter (spiral cutter) as disclosed in Japanese Utility Model Publication No. 51-45585. There is a combination of a fixed cutter and a fixed cutter.

A shredding device equipped with the above-mentioned shredding mechanism depends on the capacity of the shredding motor (drive motor) that drives the cutter, etc., as well as its continuous usage direction (rated time) and maximum number of sheets shredded simultaneously (maximum shredding torque). It is left to the.

Therefore, users use the device according to the specifications within their capabilities.

In addition, conventional document shredding devices are equipped with a shredding motor protection device such as a protection switch to prevent burnout due to overheating of the shredding motor when shredding exceeds the shredding motor's capacity for a long time. It is being Therefore, the activation of the protection switch may cause damage to the shredding motor. This prevents the shredding motor from overheating.

In addition, as disclosed in Utility Model Publication No. 54-414111, an alarm thermostat is activated due to overheating of the shredding motor, and a warning indicator light is lit to alert the user of the one-sentence shredding machine. There are some things.

<Problems to be solved by the invention> Conventionally, the capacity of the shredding motor is fixed, so if the shredding motor is used under conditions that do not match the usage conditions of the user, the shredding motor will overheat and the protective device will be activated. The shredding device becomes unusable.

The temperature at which the shredding motor protection device operates is high, and once it is activated, the shredding motor will not start until the temperature drops, and it will take a considerable amount of time before it can shred again, reducing the efficiency of shredding work. There was a problem in that the value decreased significantly.

In addition, in Utility Model Publication No. 54-4148, the temperature of the shredding motor increases and the alarm display device operates, and the decision to shred is left to the user, so the user may ignore the alarm display device or There is a risk that shredding may continue without sufficiently reducing the number of sheets shredded at the same time. In this case, the shredding motor protection device still operates, and the problem that the efficiency of the shredding work is significantly reduced cannot be solved.

As described above, since the shredding capacity of the shredding motor is specified, the usage conditions are determined and the shredding motor is limited to use only in a narrow range of boxes, making it impossible to improve the efficiency of shredding work.

The present invention aims to enable the shredding capacity of a shredding motor, widen the conditions of use, and improve the efficiency of shredding operations.

<Means for Solving the Problems> The document shredding device of the present invention is characterized in that it is provided with means for switching various windings of the shredding motor that drives the shredding cutter.

In addition, the present invention allows switching of the shredding motor's X @ cutting capacity.
It is characterized in that it is carried out in response to temperature detection of the shredding motor.

Function> According to the document shredding device of the present invention, by switching the winding of the M cutting motor, the internal impedance of the motor changes, and the flowing current changes. Therefore, the temperature rise value and output torque of the shredding motor change. If the temperature rise is low, the continuous use time of the device (open at rated time) will be longer, the output torque will be greater, and the number of sheets that can be processed (shredded) will increase.

Therefore, for a small amount of documents, the number of sheets to be shredded at one time can be increased and the processing time can be significantly shortened.

Further, since the shredding capacity of the shredding motor is switched in accordance with the rise in temperature of the shredder motor, the temperature rise is automatically suppressed. As a result, continuous use of the device is also possible.

<Embodiment> FIG. 1 is a circuit diagram for driving and controlling a shredding motor that rotates a thin 1fr 7J vine according to the present invention. The shredding motor 1 is a general AC shaded motor, and has a plurality of nine dark taps of one winding 2 as switching terminals A, B, and C in order to switch the shredding capacity. This winding 2 is supplied with power A, C, and power 5 via a power supply switch 8 and a winding cutting means 4. In the figure, reference numeral 6 denotes a protective contact for preventing overheating of the shredding motor 1, and when the motor 1 reaches a predetermined temperature T or higher, the contact opens.

The winding switching means 4 is, for example, a manual switching switch, and the common terminal 4o is connected to the power supply 5 side, and the switching terminals 'A-4B* and 4c are connected to the winding 2 of the 116 disconnection motor l. connected to each tap.

In this circuit configuration, if the supply switch 3 is turned on,
The shredding motor 1 is driven with a shredding capacity according to the winding selected by the winding switching means 4. For example, if tap A of winding 2 is not selected, a current i determined by the impedance of that winding flows through the circuit. in this case,
The output torque of the M required motor l is determined by the current i,
It also determines the rate of temperature rise. Here, the windings of each tap A to C of one gravel 2 have a relationship of A>B>C, and the current for this is iA(iB < i(H(iA nitap A
Current in case of winding with tap B, in: Current in case of winding with tap B*Current in case of winding with tap C)
There is a relationship between

The shredding motor 1 shown in FIG. 1 is arranged to drive a shredding cutter as shown in the schematic perspective view and sectional view of the shredding device in FIGS. 2 and 3.

The document shredding device 10 has a shredding section comprised of a vertical cutter means 20 and a transverse cuffer means 80. The vertical cutter means 20 is disposed below the input port 11 for inputting documents, and the transverse cutter means 30 is disposed further below the vertical cutter means 20. Documents input from the input slot 11 above are
First, it is cut into long lengths by the action of the vertical cutter means 20, and then into chips by the action of the transverse cutter means 30. The shredded chips are discharged and collected into a shredded waste storage section 12 located at the bottom of the document shredding device IO.

The vertical cutter means 20 is constructed by opposingly disposing a pair of cutter members in which metal circular blades 21 with a thickness of 1 to 8 m and resin molded spacers 22 are alternately provided. The circular blades 21 are provided at intervals of about 8 to 81III by spacers 22, and the circular blades 21 facing each other contact and rotate to shred documents into long pieces. Particularly, each cutter member has circular blades 21 and spacers 22 alternately inserted into a rotationally driven shaft 23, and circular blades 21 and spacers 22 facing each other.
1 is in contact with fm. and.

The circular blade 21 is attached to rotate as the shaft 28 rotates.

The transverse cuffer means 30 is composed of a rotary cutter 31 having a spiral blade shown in FIGS. 2 and 3 and a fixed cutter 87.

In particular, the fixed cutter 37 is rotatably supported by an integrally formed shaft portion 88, and the cutting edge is rotated by the rotational force and the force of the blade 31 by a biasing means such as a spring. It is configured to be pushed in the direction. The rotating shaft 23 of the circular blade 21 and the rotating cuffer 81 each have a bearing 1
3 and 14 are press-fitted and rotatably provided between frames 15 and 16.

The shredding motor 1 is fixedly arranged on a bottom plate or the like that is a connecting member with the frame 15.16, and the motor rotation shaft 41
A helical gear 41 directly connected to (directly formed integrally with the rotating shaft 41) transmits rotation to a helical gear 42. A normal gear 43 is provided coaxially with the Hasuha gear 42.
Rotation is transmitted to the gear 44 via the gear 48. Further, a gear 45 is provided coaxially with the gear 44, and rotation is transmitted to a gear 46 via this gear 45.

Further, a gear 47 coaxial with the gear 46 transmits rotation to a gear 48 for rotationally driving the one circular blade 21.

A gear 50, which is fixed to one end of the shaft 28 of the cutter member on the left side in FIG. 2, meshes with a gear 49 coaxial with the gear 48. A gear 51 fixed to one end is engaged.

On the other hand, a gear 52 is further meshed with the gear 46,
Via the shaft 5B to which the gear 52 is fixed.

Rotation is transmitted to the rotating cuffer 81. Such shaft 58
is rotatably supported by a frame 1316. Therefore, a transmission gear 54 is fixed to the other end of the shaft 58 on the opposite side to the gear 52 fixed to one end of the shaft 5B. The transmission gear 54 meshes with a drive gear 55 fixed to the shaft of the rotary cutter 31, that is, one end of the cylindrical portion of the rotary cuffer 81. Therefore, the rotational force
1 rotates clockwise in FIG. 1 as the shredding motor l rotates (counterclockwise), and a shaft 23 that rotates the circular blade 21 of the vertical cutter mechanism rotates in the direction of shredding documents. Each rotates.

As described above, the rotational force of the motor 1 is transmitted to the rotary cutter 81 and the shafts 23 of the vertical cutting cutter member through the rotation transmission means consisting of a large number of gears.

The gears 48.49 and 42.48 are flfJi
It is rotatably supported on the outer surface of the cutting device 10 on the frame 16 side. Further, @28 is rotatably provided between the frames 15 and 16 via a bearing 18. Further, the gears 44, 45 and 46, 47 are rotatably provided on a swinging member 60 that is rotatably supported on the frame 16 and is used for manual reverse drive.

The swinging member 60 is rotatably supported by a shaft 61 attached to the frame 16, and the gears 46, 47 are rotatably supported on this shaft 61. Therefore,
Even if the swinging member 60 rotates, the gears 47 and 48 will never become disengaged. This swinging member 6
Since the spring 62 is interposed between the frame 16 and the swinging member 60, the gear 43 and the gear 4 are always connected.
4 is biased in the direction of engagement. Normally, rotation is transmitted in the forward direction by the shredding motor 1.

Further, as shown in FIG. 3, on the operation surface of the document shredding device 10, there is a reverse manual operation section 63 for driving in reverse during overload.
has been established. A portion of the reverse manual operation section 63 protrudes from the operation surface of the document cutting device IO, and the other end is connected to an end opposite to the shaft 61 of the swinging member 60. By pressing the second reverse manual operation section, the swinging member 60 is rotated clockwise against the spring 62. The swinging member 60 further has a reversing gear 56 rotatably supported on a protruding piece 59 and meshing with the gear 44 .

This reversing gear 56 is located in a corresponding relationship with the gear 43, and is arranged so as to mesh with the gear 48 when the swinging member 60 rotates clockwise.

By providing a manual reverse transmission means with the above structure,
When the manual reverse operation unit 68 is pressed down, the rotation of the swinging unit +; t60 causes the reverse rotation gear 5 to rotate at the same time as the gears 43 and 44, which are transmission means for transmitting the rotational force of the shredding motor 1.
6 intervenes. As a result, the rotational force on the rotary cutter 81 and the circular blade 21 acts in the opposite direction, so that the shredding motor 1
Even if the paper is rotated in the same direction, the document can be simply removed.

Furthermore, when the operation section 63 is released, the spring 62
, the swinging member 60 returns to its original position and the third
As shown in the figure, the reverse gear 56 is disengaged from the transmission means for forward rotation.

In the document shredding device configured as described above, when the power supply switch aft arranged on the operation unit surface is operated and its contact is turned on, the windings 2 of the shredding motor 1 are connected to A and C.
, a power source 5 is supplied. As a result, the rotation of the gear 41 formed on the rotating shaft 40 of the shredding motor 1 rotates the circular blade 21 and the rotary cutter 31 via various gears (transmission means).

In this state, when a document is inputted from the input port 11, the pieces are shredded by the rotating force/tar means 61M1 and stored in the storage section 12. At this time, the number of sheets of shredded paper that can be simultaneously shredded by the shredding device 10 is determined by the output torque of the M motor 1. The output torque of the shredding motor 1 is determined by the current i flowing through the shredding motor 1. Further, the time during which the shredding device 10 can continuously shred the material is determined by the temperature rise of the shredding motor 1. The temperature rise of the shredding motor 1 is also determined by the current i flowing through the shredding motor 1. As the current 1 increases, the output torque of the shredding motor 1 increases, and the number of sheets that can be simultaneously shredded by the M-cutting device 10 increases. However, on the other hand, the temperature rise of the shredding motor 1 increases, and the time during which the shredding device 1° can continuously shred the material becomes shorter. Conversely, when the current 1 flowing through the shredding motor 1 decreases, the output torque of the shredding motor 1 decreases, and the number of sheets that can be simultaneously shredded by the shredding device 10 decreases. However, on the other hand, the temperature rise of the shredding motor 1 becomes lower, and the time during which the shredding device 10 can continuously shred the food becomes longer. The number of sheets that can be simultaneously shredded by the shredding device 1 and the time that it can be shredded continuously are relative to the current i in terms of shredding ability.

Therefore, depending on the usage conditions, the switching terminal 4A, which is a switching means,
, 4B, and 40.

That is, the switching terminals may be selected to meet the usage conditions as shown in Table 1 below.

Table 1 As described above, if the number of documents to be shredded is small, the switching terminal 4c can be selected to increase the maximum number of sheets to be shredded, and the processing time can be greatly shortened. Furthermore, if the shredded documents exist in a large publication, four switching terminals may be selected for continuous use.

In this case, due to overheating of motor 1, contact 6 of the protection switch
1. The user of the document shredding device can set the optimal shredding conditions by switching the switching means 4 according to the method and conditions of use. Since it can be used at any time, it is possible to increase shredding efficiency. Further, it becomes easy for the provider of the document shredding device to design a shredding device that meets the needs of the user of the shredding device, and there is no need to prepare a variety of models, which is advantageous in terms of cost.

In the above embodiments, the switching means 4 has been described as being switched manually, but it may also be configured to switch according to a rise in the temperature of the shredding motor 1. FIG. 4 shows an example of the circuit configuration, and the same parts as in FIG. 1 are designated by the same reference numerals.

In the figure, reference numeral 40 denotes a switching means, which detects an increase in the shredding motor l by /M degrees and switches the switching contacts 40A and 40C. The switching means 4o switches the switching contacts 40A and 40c based on the temperature detection set at a temperature lower than the operating temperature of the protective contact 6 for overheating prevention. For example, the shredding device 10
The initial VC is.

The temperature of the shredding motor 1 is low, below the above-mentioned temperature T1, and in that state it is in contact with the switching contact 40c side, and as the temperature rises, when it reaches 10 or more, it switches to the 40 contact.

In the circuit diagram of FIG. 4, when the power supply switch 3 is turned on, the switching means 4o selects the terminal 40c side, and the device 10 operates even with the capacity 4c shown in Table 1, for example. If the switching means 40 operates in this state and detects the temperature TI before the #lIl disconnection motor 1 rises and the protective contact 6 operates (opens), the switching means 40 will switch from the terminal 40C side to the
Switch to 0A side. Although kneading reduces the output torque of the shredding motor 1 and the maximum number of sheets to be shredded, the temperature rise is suppressed and the continuous use time can be extended.

As mentioned above, in the initial state, the maximum number of sheets to be shredded is large, so when shredding a small amount of documents, a significant time reduction can be expected. 10 can be used continuously, switching is performed midway through, and shredding can be performed efficiently without operating the maintenance If contact 6 or the like.

Here, the means 40 for switching the terminals 40c and 40A based on temperature detection may be made of, for example, a bimetal whose shape changes depending on the temperature, a shape memory alloy, or the like. In other words,
By utilizing the change in shape, each contact point may be closed to connect the terminals 40c and 40A.

In the example shown in Fig. 4, the shredding motor 10 has a winding wire of 2'ft.
Although the switching is performed by deriving two taps, it is of course possible to select and switch a plurality of taps in response to a plurality of different temperature detections. Furthermore, it would be more effective if conditions such as the maximum number of sheets to be shredded were displayed to the user in response to the switching operation to indicate the ability when the shredding capacity of the M-folding motor l is switched. Become. That is, when switching is performed due to a rise in temperature, the number of sheets to be shredded, etc. are variably switched and displayed at the same time. From this, the user knows that it is only necessary to input documents according to the number of sheets.

<Effects> According to the document shredding device of the present invention, it is possible to use the document according to the usage situation, and shredding work can be performed efficiently.

Furthermore, since the protection device is controlled so as not to operate in accordance with the rise in temperature, it is possible to continue using the shredding work without stopping, and it is possible to improve work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of drive control of the shredding motor of the shredding device according to the present invention, and FIGS. 2 and 3 are perspective views schematically showing an example of the document a'a shredding device of the present invention. The sectional view and FIG. 4 are circuit configuration diagrams showing a specific example of the tune of the shredding motor according to the present invention. 1: Shredding motor, 2: Winding wire. 4 (40): Switching means, 21: Circular blade, 31: Rotary cutter representative Patent attorney Takeshi Sugiyama (and 1 other person) Figure 1

Claims (1)

[Claims] 1. In a document shredding device equipped with a shredding motor for driving a shredding mechanism that shreds paper, a winding for rotating the shredding motor is switched depending on shredding conditions. A document shredding device characterized by comprising a switching means. 2. A shredding motor for transmitting rotational force to a document shredding mechanism equipped with a cutter for shredding paper, and responsive to temperature detection of the shredding motor to switch the shredding capacity of the shredding motor. A document shredding device characterized by comprising an actuated switching means.