JP2007136261A - Safety device for shredder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device for shredder capable of preventing paper clogging from occurring while permitting cost reduction of the shredder as a whole. <P>SOLUTION: The safety device for shredder is provided with a detection means 17 for detecting an over-heating state, disposed on a motor 14 for driving shredding parts 13, 13 that shred material (A) to be shredded, and stops a drive of the motor when the detection means detects the over-heating state, wherein the detection means has a setting temperature that is set to be lower than the over-heating limit temperature of the motor and, when detecting a prescribed setting temperature before rising to the over-heating limit temperature of the motor, the detection means performs prediction discrimination of motor stoppage by means of a prediction means and, after a prescribed time elapses from the prediction discrimination, the drive of the motor is stopped. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shredder that shreds non-paper such as paper and documents (hereinafter referred to as a shredded object), and in particular, prevents abnormal overheating of a motor that drives the shredded portion. The present invention relates to a shredder safety device.

  In a conventional shredder, as disclosed in Patent Document 1, a motor that drives a shredder that shreds an object to be shredded is provided with a detecting means that detects an overheating state, and the detecting means includes the overheating. A safety device is provided to stop driving the motor when a state is detected.

  The safety device detects the overheating state of the motor by the first and second detection means, makes the set temperature of the first detection means higher than the set temperature of the second detection means, When the set temperature is reached, the motor is stopped, the motor cooling device is operated to cool the motor, and the motor is driven when the set temperature of the second detection means is reached. When this happens, the motor cooling device is stopped.

JP-A-1-299646 (FIG. 2)

  However, in the above-described conventional safety device, two sensors are used as detection means for detecting an overheated state of the motor, and the motor cooling device is installed in order to shorten the time from the stop of the motor drive to the re-drive. Since it is used, the entire device becomes expensive.

Further, since the motor is stopped immediately when the overheating temperature of the motor reaches the set temperature of the first detection means, the motor cools while the shredded object is sandwiched between the shredded portions. Until then, the shredding operation was interrupted for several tens of minutes, and there was a problem that paper jams were likely to occur.
In particular, in a shredder, a highly confidential document or the like is processed, and therefore, there is a problem in that a person in charge of processing cannot leave the site if it is left unprocessed.

  An object of the present invention is to provide a safety device for a shredder capable of reducing the cost of the entire apparatus and preventing stopping of a paper jam.

  According to the present invention, the above problem is solved as follows.

(1) A motor that drives a shredder that shreds an object to be shredded, such as paper and documents, is provided with a detecting means that detects an overheating state, and when the detecting means detects the overheating state, In the shredder safety device for stopping driving, the detection means is set to a lower temperature than the overheat limit temperature of the motor, and a prediction means for detecting a predetermined set temperature before rising to the overheat limit temperature of the motor Thus, the motor stop prediction determination is performed, and after a predetermined time has elapsed from the prediction determination, the driving of the motor is stopped.

(2) In the above item (1), after the drive of the motor is stopped, the motor is re-driven after a predetermined time has elapsed since the temperature of the motor dropped to the predetermined set temperature. .

  According to the first aspect of the present invention, when the preset temperature of the detection means is set lower than the overheat limit temperature of the motor, and the predetermined preset temperature before the rise to the overheat limit temperature of the motor is detected, the prediction means Because the motor stop prediction is performed by a predetermined time, and the motor drive is stopped after a predetermined time has elapsed since the prediction determination, it is only necessary to use a single sensor as a detection means, thereby reducing the overall cost of the apparatus. In addition, the shredding of the shredded object can be completed while the motor stops driving, and the occurrence of a paper jam, that is, the stop in the unprocessed state can be prevented.

  According to the second aspect of the present invention, after the motor driving is stopped, the motor for the next process is driven after a predetermined time has elapsed since the temperature of the motor dropped to the predetermined set temperature. Therefore, the probability of unprocessed stop can be reduced, the motor can be naturally cooled without using a cooling device, and the cost of the entire device can be reduced.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a shredder equipped with the safety device of the present invention, FIG. 2 is a vertical side view, and FIG. FIG. 4 is a control block diagram of a driving system and a display system by each detecting means, and FIG. 5 is a diagram showing the motor overheating temperature. FIG. 6 is a flowchart showing the control state of the drive system and the display system by the detection means, and FIG.

  As shown in FIGS. 1 and 2, the shredder (1) of the present embodiment has a case body (2) composed of a vertically long bottomed cylindrical body with short sides before and after in plan view and long sides on the left and right. The upper part is opened, and the storage spaces (2a) and (2b) are defined on the upper and lower sides.

  In the upper storage space (2a) in the case body (2), a shredding unit (3) is detachably assembled. The shredding unit (3) has a top cover (5) provided with an operation panel (4) at the front, and the top cover (5) has a thin center such as paper / documents at the center of the top surface. A slot (6) into which the cut piece (A) is thrown is formed. The insertion port (6) is formed of a pair of upper and lower guide plates (7) and (8) that are inclined downward at a predetermined angle toward the rear of the case body (2). The upper guide plate (7) is fixed to the upper surface cover (5) by bending or curving the front end portion (7a) downward, and the lower guide (8) has its front end portion (8a) connected to the upper guide plate. It is positioned forward and inward from the tip (7a) of (7) and is bent in a suspended state, and its end (6) side end (8b) is pivotally attached by a shaft (9) to the lower side. Can be tilted.

  As shown in FIG. 3, the upper guide plate (7) and the lower guide (8) have an interval (a) that forms an insertion passage (10) into which several sheets of paper can be inserted in a stacked state. The lower guide (8) is urged upward by the leaf spring (11) so as to maintain this interval (a), and the insertion passage (10) is inserted from the insertion port (6) side. ) When a thick object such as a person's hand or cardboard that is greater than the distance (a) is inserted, the lower guide (8) tilts downward (in the direction of the arrow) against the urging force of the leaf spring (11). The movement of the lower guide (8) due to this tilting is detected by a thick object detection sensor (12) comprising a limit switch.

  Further, the distal end portion (7a) of the upper guide plate (7) is bent or curved so as to face the distal end portion (8a) of the lower guide (8) on the outlet side of the insertion passage (10), When a hard and difficult-to-bend object that is more than shredding capacity, such as a plastic plate or a metal plate, is inserted from the insertion passage (10), the insertion is suppressed and the object to be shredded along with further insertion (A) The lower guide (8) is actuated to tilt downward against the biasing force of the leaf spring (11), and the lower guide (8) is moved by this tilting. The thick object detection sensor (12) is used for detection.

  A pair of front and rear chopping rollers (13) and (13) serving as chopping portions are meshed with each other at the lower portion of the inlet (6) in the upper surface cover (5). These chopping rollers (13) and (13) An object to be shredded (A) is introduced into the upper part of the space through the insertion port (6) through the insertion passage (10). The chopping rollers (13) and (13) are interlocked with a motor (14) that is disposed adjacent to the lower portion of the upper surface cover (5) and can be rotated forward and backward. The shredded object (A) is driven to be shredded.

  In the lower storage space (2b) in the case body (2), a trash box (B) for storing shredded waste shredded at the shredded portion from the front opening (15) is loaded and stored. It has become so. A trash can detection sensor (16) comprising a limit switch is installed on the inner bottom surface of the lower storage space (2b), and the trash can detection sensor (16) is loaded depending on the presence or absence of the trash can (B). Is detected.

  As shown in FIG. 2, the housing (14a) of the motor (14) is provided with an overheat detection sensor (17) for directly detecting the overheat state of the motor (14). 17) is set to a set temperature (eg, 70 ° C.) lower than the overheat limit temperature (eg, 100 ° C.), which is an abnormal overheat temperature of the motor (14), and increases to the overheat limit temperature of the motor (14). When a predetermined set temperature before the detection is detected, the prediction means that heating is predicted in the future is performed by the prediction means, and after a predetermined time elapses (for example, 1 minute) from the prediction determination, the motor ( 14) After the drive of 14 is stopped and the drive of the motor (14) is stopped, the temperature of the motor (14) is lowered to the predetermined set temperature and after a predetermined time has elapsed (for example, 5 minutes), Controlled so that the motor (14) can be driven again It has become the jar.

  Further, a door (18) is provided on the front surface of the case body (2) so as to be freely opened and closed. The door (18) is opened and closed near the door hinge (18a) of the case body (2). It is detected by a door open detection sensor (19) consisting of a provided limit switch, and this door open detection sensor (19) stops the motor (14) of the drive unit when the door (18) is open, When the door (18) is closed, the motor (14) is controlled to be allowed to drive.

  Further, as shown in FIG. 1, two sheet sensors (20) for detecting the insertion state of the shredded object (A) in the width direction of the insertion passage (10) in the insertion port (6). (20) is installed. As shown in FIGS. 2 and 3, each of the sheet sensors (20) has an insertion passage (10) in which the insertion port (6) is formed by an upper guide plate (7) and a lower guide (8). ) Between the light projecting element (20a) and the light receiving element (20b).

  On the operation panel (4), as shown in FIG. 1, button switches such as a start / restart button (reset button) (21a), a reverse button (21b), a stop button (21c) (21 LED display lamp group (22) for displaying power supply, operation stopped, thick object, full trash, door open / no trash, motor overheat, etc. are provided. These button switches (21) and the above-described overheat detection sensor (17) of the motor (14) are connected to a controller (24) comprising a microcomputer together with other sensors (23) as shown in FIG. The controller (24) controls the drive / stop of the motor (14) via the motor driver (25) when the overheat detection sensor (17) detects the overheat state of the motor (14), and the display driver ( The LED display lamp group (22) is selectively lit / flashed via 26).

  Next, the control state of the motor (14) by the overheat detection sensor (17) will be described based on the flowchart and timing chart of FIG. Note that the start mode can be selectively switched between the auto mode and the manual mode, and in the present embodiment, the auto mode will be described as an example. In FIG. 6, the time lag of the temperature from the initial overheating state of the motor (14) through the overheating limit state to the cooling state is indicated by a dotted line.

  First, in step (hereinafter abbreviated as ST) 1, the object to be cut (A) is detected by the two paper sensors (20) and (20). When the object to be cut (A) is inserted into the insertion port (6) of the top cover (5) and the two paper sensors (20) and (20) are both turned on, the motor (14) is driven to rotate forward in ST2. Then, the process proceeds to ST3. In ST1, when the paper sensor (20) is OFF, the process returns.

  In ST3, when all the safety detection sensor conditions of the other safety detection routines in the shredder (1) are normal, that is, when all the sensors are OFF, the shredder roller (13 ) (13), the shredded object (A) is shredded (ST4). In this state, when both the paper sensors (20) and (20) are turned off and it is judged that the shredding of the shredded object (A) is finished (ST5), the operation of the motor (14) is stopped after 5 seconds. (ST6), the shredding is finished and the process returns to the auto start.

  In ST5, even if one of both paper sensors (20) and (20) is turned off, if the other is maintained in the ON state, the process returns to ST2 to continue the forward drive of the motor (14). The shredded object (A) is shredded until both the paper sensors (20) and (20) are turned off. During shredding operation of the shredded object (A), the forward drive of the motor (14) is continued unless both paper sensors (20) (20) are turned off. Accordingly, it is possible to reliably prevent a paper jam between the chopping rollers (13) and (13) during chopping.

  In ST3, when there is an abnormality in the sensor conditions of the other safety detection routine in the shredder (1), that is, as in this embodiment, the overheat temperature of the motor (14) exceeds the set temperature of 70 ° C., and overheat detection is performed. When the sensor (17) becomes NO (ST7), the lamp indicating the motor overheating in the LED display lamp group (22) blinks (ST8). At this time, the motor (14) does not stop immediately, but continues the shredding drive of the shredded object (A) for 1 minute (ST9). Thus, the shredding of the shredded object (A) can be completed while the motor (14) stops driving, and a paper jam, that is, an unprocessed stop state can be prevented.

  In ST9, after the drive of the motor (14) has passed for 1 minute, the operation of the motor (14) is stopped (ST10), and the lamp indicating the motor overheating of the LED display lamp group (22) is lit (ST11), The motor (14) is naturally cooled.

  In ST12, when the temperature of the motor (14) falls below the set temperature of 70 ° C. and the overheat detection sensor (17) is turned off, the motor (14) is driven until a required cooling time, for example, 5 minutes elapses. Is stopped (ST13), and the natural cooling of the motor (14) is continued.

  In ST13, after the motor (14) has been stopped for 5 minutes, the lamps indicating the motor overheating in the LED display lamp group (22) are extinguished (ST14), and the auto-start standby state is restored.

  In ST7, when the overheat detection sensor (17) is in an OFF state and there is an abnormality in another sensor condition in the shredder (1), that is, when an error has occurred in another routine, the process proceeds to ST15 and an error occurs. Is released.

  In ST15, when the error is canceled and it is determined that the other sensor conditions are normal, the process proceeds to ST16, the start / restart button (21a) is turned ON, and the auto-start standby state is restored.

It is a perspective view showing one embodiment of a shredder provided with the safety device of the present invention. It is a vertical side view. 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. It is a control block diagram of the drive system and display system by each detection means. It is a flowchart which shows the control state of the drive system by the detection means of a motor overheat temperature, and a display system. It is also a timing chart.

Explanation of symbols

(1) Shredder
(2) Case body
(2a) Upper storage space
(2b) Lower storage space (storage section)
(3) Shredder unit
(4) Operation panel
(5) Top cover
(6) Input port
(7) Upper guide plate
(7a) Tip
(8) Lower guide plate
(8a) Tip
(8b) Rear end
(9) Shaft
(10) Insertion passage
(11) Leaf spring
(12) Thick object sensor
(13) Shredded roller (shredded part)
(14) Motor
(14a) Housing
(15) Opening
(16) Trash detection sensor
(17) Overheat detection sensor (detection means)
(18) Door
(18a) Door hinge
(19) Door open detection sensor
(20) Media sensor
(20a) Emitting element
(20b) Photo detector
(21) Button switches
(21a) Start / Restart button
(21b) Reverse button
(21c) Stop button
(22) LED indicator lamp group
(23) Other sensors
(24) Controller
(25) Motor driver
(26) Display driver
(A) Shredded object
(B) Trash
(a) Interval

Claims (2)

The motor that drives the shredding part that shreds the shredded object such as paper and documents is provided with a detecting means for detecting the overheating state, and when the detecting means detects the overheating state, the driving of the motor is stopped. In the shredder safety device
The detecting means is set to a lower temperature than the overheat limit temperature of the motor and performs prediction determination of motor stop by a prediction means for detecting a predetermined set temperature before rising to the overheat limit temperature of the motor. A shredder safety device, wherein a drive of the motor is stopped after a predetermined time has elapsed since the prediction determination. The shredder safety according to claim 1, wherein the motor can be driven again after a predetermined time has elapsed since the temperature of the motor dropped to the predetermined set temperature after the motor was stopped. apparatus.

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