JP7280766B2 - shredder cutter control mechanism - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling the rotation of a cutter of a shredder for efficient residual feed, and at the same time, to a shredder control mechanism capable of efficiently detecting full shredders.

Many shredder designs for shredding paper are known in the prior art. Generally, the paper is shredded into a plurality of noodles in the direction in which the paper is shredded, and the noodles are further shredded in the horizontal direction.

JP-A-2002-273252

The configuration shown in FIG. 1 of Patent Document 1 is an example of a typical conventional shredder, in which vertical cutting cutters 12 and 12 shred the shredder into noodles, followed by horizontal cutting cutter 13 and horizontal cutting cutter 14 . It is finely shredded in the horizontal direction by The longitudinal cutting process and the transverse cutting process are performed in conjunction with each other.

A typical cutter control in the conventional example is, as shown in the flow sheet of FIG. performs normal shredding. On the other hand, when the loaded paper runs out and the sensor no longer detects paper (2), in order to shred all the paper remaining between the position of the sensor and the cutter, the remaining paper is sent in the direction of the cutter and the residual feed process is performed. Go to mode (3). Note that the relationship between paper detection 2 and 2' is a logical configuration on the flow, and when paper is not detected, the cutter operation (4) for discharging the remaining paper fragment is directly performed in the remaining feed processing mode 3. , indicates that normal operation is performed while the presence of paper is detected. The operation of the cutter shreds and discharges the remaining pieces of paper, and includes an idling operation for removing fine shreds adhering to the cutter. It was set to a fixed time, for example 8 seconds. Then, when the remaining feed time has passed, the cutter stops and a series of operations are performed in the standby state (5).

By the way, in the case of the conventional control as described above, the setting of the remaining feed time in the remaining feed processing mode (3), that is, the cutter operation (4) is preset to 8 seconds, for example. Even if the load is low, such as when there is only one piece of paper to be processed, or even if there is actually no load, the cutter will operate for the eight seconds. In other words, there is a problem that unnecessary remaining feed processing is performed for low-load targets. Conversely, if the target paper strips consist of multiple sheets, the load applied to the cutter becomes high. There is also a problem that the cutter stops while biting into the cutter. Therefore, if it is possible to change the remaining feeding time in accordance with the state of the remaining pieces of paper, the shredding process can be performed more efficiently.

As a further problem, shredders are generally equipped with a storage box below the cutter for accumulating shredded paper pieces. The drive of the cutter is stopped at the point of time. This fill level is detected by a sensor that monitors the shred height from the vertical direction of the bin. However, if the cutter stops when it detects that the paper is full while shredding, the paper will bite into the cutter strongly during shredding, and even if the cutter drive is restored, there is a risk that the cutter rotation will be hindered. There is In order to avoid this, conventionally, when the full state is detected, the cutter is forwardly rotated for up to 7 seconds until the paper detection is turned off, and then the remaining feed is performed for 5 seconds. If paper feed is still detected after 7 seconds of forward rotation, the cutter is reversed. It prevents paper jams.

Referring to FIG. 4, a series of processes for conventional fullness detection will be explained. First, when fullness is detected by the sensor (12) during the paper shredding process (11), a fullness processing step (13) is started. Here, when the paper is continuously detected and the forward rotation time elapses (15), the process shifts to re-insertion prevention processing (18), and after reverse rotation for 4 seconds (19), shifts to the standby state after an error (17). The reverse rotation time of 4 seconds is an example, and does not imply a strict limitation to 4 seconds. If the paper is not detected in the middle (16), the remaining feed process (20) is performed, and after the remaining feed time has elapsed, the paper detection is confirmed (20'). The flow of the prevention process (18) is performed, and if the paper is not detected, the standby state after the error (17) is entered as it is.

By the way, in the conventional full detection described above, if an attempt is made to continuously add sheets of paper, depending on the feeding speed, additional feeding is permitted even though the paper is full, or the additional feeding is permitted. Depending on the amount of paper that is used, the actual amount of fullness will be uneven, and if the fullness level is set to the very limit of the storage box, the shredded pieces of paper will protrude from the storage box. . Therefore, a process of fullness detection without unevenness is desired.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems, and to provide a highly reliable shredder by achieving efficient residual feeding and uniform fullness detection processing. It is something to do.

In order to solve the above problems, the present invention provides a control mechanism for a cutter of a shredder, comprising a step of detecting paper in a paper shredding process, and shredding after the paper is no longer detected in the process of detecting paper. It consists of a remaining feed processing process for shredding the paper inside, and this remaining feed processing is a time calculated from the actual rotation speed of the cutter driven by the inverter-controlled motor and the predetermined shredding length. is the remaining feed time. According to this means, the time required for the remaining feed process is calculated from the speed at which the cutter is actually rotating. When the load is large due to the disconnection, the remaining feed time is lengthened, and since these times are variable according to the load, the remaining feed can be reliably performed. Here, the term "paper is no longer detected" means that detection is turned off from an ON state due to the absence of paper in a state in which the presence or absence of paper is continuously monitored by a sensor.

In addition, the actual rotation speed of the cutter is detected by detecting the operating frequency of the inverter control and calculating it based on this frequency. No need. Therefore, it is possible to prevent the detection unit from malfunctioning due to dust generated at the time of shredding.

Further, the remaining feed time is calculated by dividing the predetermined shredding length by the actual rotation speed of the cutter, and adding the time corresponding to the predetermined number of idling of the cutter. Since it is set to time, it is possible to respond by appropriately setting the shredding length regardless of whether the shredder is large or small.

In addition, the present invention employs a mechanism that performs processing when the shredded waste is full in the storage box. is divided by the actual rotation speed of the cutter. As a result, the length of the paper to be fed does not vary depending on the rotational speed of the cutter. Furthermore, after the presence of paper is no longer detected, the processing described in claim 1 also eliminates unevenness. Further, when the paper is additionally inserted during the remaining feeding process, the re-insertion prevention process is performed as soon as the paper is detected to prevent the shredded paper pieces from protruding from the storage box. On the other hand, when the presence of paper is detected, the cutter is rotated in the normal direction for a certain period of time, and the motor drive is stopped after a certain period of time after preventing new paper to be shredded from being introduced.

According to the present invention, it is possible to efficiently achieve the remaining feed required at the final stage of shredding by the shredder. In addition, since the shredded paper pieces to be stored in the storage box can be unified at a uniform level, it is possible to improve the storage efficiency.

FIG. 4 is a flowchart showing a series of processes for remaining feed according to the present invention; FIG. 4 is a flowchart showing a series of processes for fullness detection according to the present invention; FIG. 10 is a flow chart showing the remaining feed processing of the conventional example. FIG. 10 is a flow chart showing processing for full detection in a conventional example;

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. FIG. 1 is a flow diagram illustrating a series of processes for residual feeding of paper strips to be shredded, and the same numbers as in FIG. 3 showing the conventional example indicate the same processes. When the paper shredding process is started (1) and the presence of paper is detected (2), normal operation is started. Then, if the sensor provided at the paper inlet does not detect the paper, the remaining feed process is started (3). In the remaining feed process (3), the remaining feed time T is calculated from the actual rotational speed of the motor that drives the cutter (21), and on the condition that the paper is not detected (2') the cutter rotates for the time T. Then, the remaining feed is performed (22). Taking the calculation of the time T as an example, the control of the rotation speed of the motor is performed by inverter control. to calculate Specifically, as an example, it is possible to divide the distance from the sensor used in paper detection (2) until the piece of paper leaves the cutter by the actual rotation speed of the motor, and further feed the distance of two circumferences of the outer circumference of the cutter. The available time is calculated from the actual number of rotations of the motor. These two rounds are idling portions for removing shreds adhering to the cutter. Therefore, even if the actual speed of the motor varies depending on the load, the amount of input paper is small and the load is small. If the speed is slow, the time T will be long. In this way, even if the number of paper strips to be left-feeded is a single sheet and the load is small, or if the load is large because there are a plurality of sheets, the remaining-feeding process can be performed reliably.

The cutter operating time for residual feed (22) is controlled by time T, which generally varies between 2 and 16 seconds. However, this numerical value is an example and does not mean that the time is limited to 2 to 16 seconds. Then, when the time T of the remaining feed (22) elapses, it shifts to the standby state (5). If paper is detected in determination (2'), the process returns to paper shredding process (1), and normal operation or residual feed process (3) is selected according to the conditions.

As described above, in this embodiment, since the rotation speed of the motor and the remaining feed time T are interlocked, the remaining feed processing is terminated early when the load of shredding is small, and when the load is large, the rotation of the motor is reduced. Since the speed becomes slower, the time for remaining feed processing can be appropriately secured accordingly. An important element for calculating the remaining feed time T in the present invention is to detect the number of revolutions of the motor under inverter control and divide a predetermined distance based on that number of revolutions. The specific structure of the shredder does not matter as long as it can achieve this.

Next, processing for fullness detection will be described with reference to the flow chart of FIG. The same numbers as those shown in the flowchart of FIG. 4 indicate the same processing. First, when the sensor detects fullness during the paper shredding process (11) (12), at the same time, a buzzer or pilot lamp is used to notify this, and the subsequent fullness processing process (13) is started. Up to this point, it is the same as before. In the details of the full processing step (13), first, the forward rotation time T1 is calculated from the motor speed (31). The calculation criterion for T1 is the time required to feed the A4 size paper that is the most subject to shredding. That is, since the length of the A4 size paper is fixed, the time T1 is determined by dividing this by the actual speed of the motor. The speed of the motor is the same as explained in FIG. When the time T1 has passed (32) on the condition that the paper is detected (14), the process proceeds to the re-insertion prevention process (19). A series of processes for transitioning to the re-entry prevention process are the same as those described with reference to FIG. Here, the error processing is to stop the motor drive in order to stop the rotation of the cutter when a series of fullness detection processing is completed. Any means can be used to cancel the error processing, such as canceling by pressing a reset button, or removing the shredded waste from the storage box and re-installing the storage box in a state where there is storage capacity.

On the other hand, if it is determined that no paper remains in the paper detection process step (14), the remaining feed time T is calculated based on the speed of the motor (21). The time T is the same as the description of the flow in FIG. Also, under the condition that the paper is not detected (33), the cutter rotates for the time T and the remaining feed is performed (22). Then, when the time T of the remaining feed (22) has passed, it shifts to the standby state after error (18). If paper is detected in judgment (33), the process proceeds to re-insertion prevention processing (19), and the same processing as described with reference to FIG. 4 is performed. In the present embodiment, the time T1 is calculated, and after the motor is rotated forward for the time T1, re-entry prevention processing is performed. The time T is calculated, and the remaining feed processing shown in FIG. 1 is performed. In the flow chart showing the present embodiment, the function of the rhomboid block indicating judgment includes a block that simultaneously means a case of judgment only and a function that performs processing along with judgment, but refer to the detailed description of the invention for these. It is understandable.

In this way, when fullness is detected, the discharge time is calculated based on the speed of the motor actually running on the basis of A4 paper, which is used most often. Whether the number of sheets is one or a plurality of sheets, shredding can be reliably performed to the end. In the present embodiment, A4 paper is used most frequently, but the basic technique is the same regardless of whether the paper is B5 or B4.

1 Paper shredding process 2 Paper detection 3 Remaining feed process mode 4 Cutter operation 5 Standby state 11 Paper shredding process 12 Full detection 13 Full process 14 Paper detection 15 Cutter forward rotation 18 Re-insertion prevention process 21 Time T calculation 22 Remaining feed 31 Calculate time T1

Claims (4)

A shredder cutter control mechanism comprising a process of detecting paper in a paper shredding process, and a residual feed for shredding the paper being shredded after the paper is no longer detected in this process of detecting paper. In this remaining feed processing step , the remaining feed time is calculated from the actual rotational speed of the cutter driven by the inverter-controlled motor and the predetermined shredding length . It has a step of detecting the fullness of the scrap storage box, drives the motor for the time obtained by dividing the length of paper to be shredded by the actual rotation speed of the cutter, and does not detect the presence of paper. A shredder cutter control mechanism characterized in that it sometimes shifts to the remaining feed processing step . 2. A control mechanism for a cutter of a shredder according to claim 1, wherein the actual rotation speed of the cutter is calculated based on the detected frequency of inverter-controlled operation. 3. The remaining feed time is calculated by dividing a predetermined shredding length by the actual rotational speed of the cutter, and further adding a time corresponding to the predetermined number of idle rotations of the cutter. Shredder cutter control mechanism. The shredder cutter according to claim 1 , which rotates the cutter in the normal direction for a certain period of time when the presence of paper is detected, prevents the introduction of new paper to be shredded, and stops the motor drive after the certain period of time has elapsed. control mechanism.

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