JPH0994472A - Automatic starting and automatic stopping mechanism of shredder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to surely shred paper to the last with a shredder which detects the paper by using a start lever. SOLUTION: A paper detecting plate 9 disposed to project into a paper feed port is fixed to one end of a transmission shaft 10 freely rotatably supported at a detecting plate protective frame 12. The start lever 13 is fixed to the other end. The paper detecting plate and the start lever are made cooperatively turnable. An actuator 22 of a microswitch is disposed to face the front end of the start lever. Further, the outer flank of a switch cam 14 for actuating the actuator by rotating cooperatively with a rotary blade is provided with an ejecting projection in a circumferential direction. On the other hand, the front end of the moving piece of a start lever stopper 16 disposed at the left frame of the main body is provided with a detaining projection 19 projecting into the rotating region of the start lever and is simultaneously provided with a projection for release in the position contacable with the ejecting projection on the outer flank of the switch cam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shredder which shreds paper inserted into a paper slot with a pair of rotary blades, detects when a paper is thrown in, and automatically rotates the rotary blade to shred the paper. This is related to the shredder auto-start / auto-stop mechanism that stops the rotary blade when the end of the paper is detected and ends the shredding, and does not use an optical sensor or an electric timer, but a cam mechanism, etc. The rotation of the rotary blade is controlled by switching the on / off operation of a micro switch connected to the drive motor of the rotary blade.

[0002]

Conventional shredder auto-start / auto-stop mechanisms are usually
A sensor is provided at the paper insertion port, and when the paper is inserted, the sensor detects the presence or absence of the paper and controls the rotation of the rotary blade. In this case, since there is a certain distance between the detection position of the sensor and the position of the shredded portion of the rotary blade, even if the end of the paper passes the sensor and a signal indicating that there is no paper is present, The end has not reached the rotary blade yet, and until the shredding is completed, it is necessary to continue rotating the rotary blade for a while after that.

In the case of a shredder using an optical sensor as a sensor, an electric timer is often provided in order to continue the rotation of the rotary blade. That is, when the optical sensor detects the passage of paper, the electric signal causes the timer to operate, and after the set time has elapsed, a signal for stopping the drive motor of the rotary blade is output. But,
In this case, there is a problem that the circuit becomes complicated and it takes time to manufacture.

On the other hand, in a shredder of the type in which a mechanical start lever is provided as a sensor, a micro switch is pressed by the start lever pressed on the paper, and the micro switch directly turns on the power source of the drive motor for the rotary blade, Although it can be manufactured at low cost, when the paper passes the start lever, the micro switch is turned off and the drive motor stops before the paper finishes passing the rotary blade.
For this reason, it has been necessary to manually push the forward rotation switch and the like and continue to rotate the motor until the shredding is completed.

The present invention is a shredder using a start lever as a device for detecting the presence / absence of paper, which overcomes the above-mentioned problems, and even if the start lever returns at the end of paper, the cam motor or the like rotates the drive motor for a certain period of time. It is an object of the present invention to provide an automatic start / auto stop mechanism of a shredder that can continue to perform the above and reliably cut the paper to the end without relying on manpower.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a paper detection plate provided so as to project into a paper insertion port is fixed to one end of a transmission shaft rotatably supported by a detection plate protection frame, and the other end of the transmission shaft is fixed to the other end. Is a switch that locks the start lever so that the paper detection plate and the start lever can rotate in conjunction with each other, and the micro switch actuator faces the tip of the start lever. While providing a push-up protrusion in the circumferential direction on the outer surface of the cam,
At the tip of the movable piece of the start lever stopper provided on the left frame of the main body, there is provided a locking projection that projects into the rotation area of the start lever, and at the same time, at a position where it can contact the push-up projection on the outer surface of the switch cam. The above-mentioned problem is solved by providing a releasing projection.

More specifically, a swinging shaft is installed on the tip of the movable piece, and a swinging piece that is swingable about this shaft is attached, and the lower surface of the swinging piece is a slanted front surface and the back surface is locked. The above problem is solved by means of providing a locking projection having a surface, or by providing a locking member having a slidable front surface and a back surface as a locking surface directly at the tip of the movable piece. It is a thing.

In the shredder auto-start / auto-stop mechanism of the present invention having the above-described structure, when the paper is inserted, the paper detection plate rotates, and the start lever that interlocks via the transmission shaft rotates to push the actuator of the microswitch to drive it. The motor is operated and the rotary blade is rotated to start shredding, but at that time, even if the stop projection temporarily blocks the return of the start lever and the end of the paper is detected, The above-mentioned actuator is pressed by the cam surface of the cam to continue the rotation of the rotary blade, and then the push-up projection pushes the start lever stopper outward by the rotation of the switch cam, releasing the locking of the start lever, The state is returned to and the rotation of the rotary blade is stopped. Therefore, even after the end of the paper is detected, the rotary blade continues to rotate and can be shredded to the end of the paper until the push-up protrusion of the switch cam releases the lock of the start lever.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The details of the auto-start / auto-stop mechanism of a shredder according to the present invention will be described below based on the embodiments shown in the drawings. 1 and 2 are a plan view and a front view showing an outline of a main part of a shredder to which the present invention is applied. In the drawings, 1 is a right frame, 2 is a left frame, 3 and 3 are both parallel frames 1,
A pair of rotary blades rotatably supported between two blades. 4,
Reference numeral 4 denotes a co-operating gear that is attached to one shaft end of the rotary blade 3 and meshes with each other, and co-rotates the rotary blades 3 in opposite directions. Reference numeral 5 denotes a drive gear attached to the shaft end of the drive motor 6, which transmits the driving force of the drive motor 6 to the cooperating gear 4 via the transmission gear 7 to rotationally drive the rotary blade 3. The frame of the shredder body, electric circuit, etc. are omitted.

Reference numeral 8 denotes a paper inlet, which is installed between the frames 1 and 2 so as to face above the rotary blade 3 and guide the shredded paper to the occlusal portion of the rotary blade 3. Also, 9, 9
Is a paper detection plate provided so as to project from one side of the paper insertion port 8 to a paper passage portion, and one end of the paper detection plate 1 will be described below.
It is fixed to 0 so as to be rotatable, and its tip is faced between the guide projections 11 and 11 projecting from the other inner surface of the paper insertion opening 8 with a predetermined width. Reference numeral 12 denotes a detection plate protection frame provided on one side of the paper insertion port 8, which protects the rotation of the paper detection plate 9 and also rotatably supports the transmission shaft 10.

The movement of the paper detection plate 9 will be explained. First, when the paper is loaded, the leading end of the paper is guided by the guide projection 11 described above.
The paper detecting plate 9 is pushed outward by advancing along the ridges of the sheet, and that state continues while the sheet is present. That is,
The paper detection plate 9 rotates rearward about the transmission shaft 10, and the rotation of the transmission shaft 10 detects intrusion and passage of paper. On the other hand, when the paper runs out, the detection plate rotates in the direction opposite to the above due to the moment of the paper detection plate 9, and the paper detection plate 9 returns to the original position to determine the paper-free state. In the above embodiment, the paper detection plates 9 are provided at two places near the central portion, but the present invention is not limited to this, and in order to accurately detect the end portion of a deformed paper, the paper insertion plate 9 It is desirable to provide a plurality of locations over the entire width of the mouth 8.

Next, FIG. 3 is an enlarged view of the portion A shown in FIG. 2, and FIG. 4 is a side view thereof. In the figure, 10 is the above-mentioned transmission shaft, which rotates on the detection plate protection frame 12. The paper detection plate 9 is fixed to one end, and the start lever 13 is fixed to the other end in a suspended state. Therefore, the start lever 13 rotates in conjunction with the paper detection plate 9 via the transmission shaft 10. A switch cam 14 is fixed to the shaft end of one of the rotary shafts 3a of the pair of rotary blades 3 and contacts the actuator 22 of the microswitch 21 described later in accordance with the rotation of the rotary cam 3a. It realizes an on / off operation. As shown in FIG. 5, for example, the switch cam 14 has a large-diameter cam surface 14a in which a part of the cylinder is cut out and the actuator 22 of the micro switch is pressed for a substantially half circumference to keep it in the ON state. The other half circumference is a small radius cam surface 14b which separates the actuator and turns off the microswitch. In addition, a semi-cylindrical push-up protrusion 15 that pushes outwardly a release protrusion 20 of the start lever stopper 16 described below is provided on the outer surface of the switch cam 14 in the circumferential direction.

The lower end of the start lever stopper 16 is fixed to the left frame 2 and the start lever 1
3, a swinging shaft 17 is installed at the tip of a movable piece 16a extending upward to the vicinity of the side surface, and a swinging piece 18 that is swingable about this shaft is attached. Then, the lower end of the swing piece 18 is provided with a triangular locking projection 19 which projects into the rotation area of the start lever 13 and has a slidable surface 19a with an inclined front surface and a locking surface 19b on the rear surface ( (See FIG. 6). Further, a release projection 20 is provided at a position where the movable piece 16a can come into contact with the push-up projection 15.

The swing piece 18 is normally in contact with the start lever 13 as shown in FIG. 7. However, when the start lever 13 is rotated rearward in conjunction with the paper detection plate 9, the start lever 13 swings. After pushing the moving piece 18 rearward, it advances along the sliding surface 19a, and after passing completely, the swinging piece 18 returns to its original state by a moment, and the locking surface 19b on the rear surface thereof causes the start lever 13 to move. It will prevent the return of.

The reason why the locking mechanism is adopted is as follows. That is, in the paper detection mechanism according to the present invention, the paper detection plate 9 is rotated by the insertion of the paper as described above, and the start lever 13 interlocking with the paper detection plate 9 is rotated while pushing the locking projection 19, so that the thin paper is detected. If the start lever 13 is resistant to rotation in the case of shredding, the paper detection plate 9 that interlocks with the start lever 13 may not be pushed in even if paper is inserted. This is because it is necessary to reduce the resistance to.

The micro switch 21 is directly connected to the power supply circuit of the entire shredder and controls the rotation / stop of the drive motor 6 directly.
Of the start lever 13 is in contact with the end portion of the start lever 13 when the micro switch 21 is off. When the switch cam 14 rotates as the rotary blade 3 rotates, the micro switch 21 is turned on while the cam surface 14a having the larger radius contacts the actuator 22. It is installed in such a position. Note that the illustration of the electrical wiring is omitted.

Next, the operation of the auto-start / auto-stop mechanism of the shredder according to the present invention will be described. Generally, the shredder controls the drive motor such as forward rotation, reverse rotation, automatic (auto start,
Auto stop) changeover switch is provided. Of these, the present invention works when automatic is selected.

FIG. 8 (A) shows a stopped state before the paper is loaded. In this state, the paper detection plate 9 projects to the paper passing portion of the paper loading port 8 and is interlocked via the transmission shaft 10 to start. The lever 13 is in a state of hanging by its own weight. Therefore, the actuator 22 of the micro switch 21 is also in the off state, and the drive motor 6 is stopped. Further, the cam surface 14b of the switch cam 14 having a small diameter faces the actuator 22.

Next, as shown in FIG. 8B, the paper insertion port 8
When the paper (P) is fed into the paper, the paper advances on the guide projection 11 so as to push the paper detection plate 9 outward, and the paper detection plate 9 moves to the transmission shaft 1
The transmission shaft 10 rotates about 0, and the start lever 13 connected to the other end of the transmission shaft 10 also interlocks and rotates about the transmission shaft 10. The rotation of the start lever 13 presses the actuator 22 of the micro switch 21 to turn on the micro switch 21, the drive motor 6 rotates, and the rotation of the rotary blade 3 starts shredding of the paper (P).

At this time, the start lever 13 has the swing piece 18
It slides along the sliding surface 19a of the locking projection 19 at the lower end, and moves forward while pushing the rocking piece 18 rearward through the rocking shaft 17, so that the rocking piece 18 is moved by the start lever 13. After the passage, the moment returns to the original position on the back surface of the start lever 13. Although the switch cam 14 rotates together with the rotary blade 3, the start lever 13 moves the micro switch 2 while the paper (P) passes through the paper detection plate 9.
Since the first actuator 22 is continuously pressed, the rotary blade 3 can continue to rotate regardless of the position of the cam surface of the switch cam 14.

On the other hand, as shown in FIG. 8C, paper (P)
When the trailing end of the sheet has passed through the paper detection plate 9, the start lever 13 tries to return to the initial state due to the moment, but since the swinging piece 18 returns to the original position as described above, the start lever is returned. The rear surface of 13 abuts on the locking surface 19b of the locking projection 19 of the rocking piece 18, and the start lever 13
Has prevented the return of. At this time, since the large-diameter cam surface 14a of the switch cam 14 is pressing the actuator 22 of the micro switch 21, the micro switch 21 is maintained in the ON state and the rotary blade 3 continues to rotate.

When the switch cam 14 rotates to the position shown in FIG. 8D, the contact surface of the switch cam 14 with the actuator 22 shifts from the large diameter cam surface 14a to the small diameter cam surface 14b. Then, the actuator 22 tries to return to the off state. However, the start lever 13 moves the swinging piece 1
8 is blocked, the actuator 22 of the microswitch 21 is blocked from returning while being in contact with the start lever 13. Therefore, the ON state of the micro switch 21 is maintained and the rotary blade 3 continues to rotate.

When the switch cam 14 further rotates, FIG.
When it reaches the position shown in (E), the push-up protrusion 15 on the outer surface of the switch cam 14 contacts the release protrusion 20 of the start lever stopper 16 and pushes it outward. Then, the entire swing piece 18 provided on the upper end of the movable piece 16a is retracted and the locking projection 19 is disengaged from the back surface of the start lever 13, so that the start lever 13 is returned to its original initial position by the moment. However, at this time, since the large cam surface 14a of the switch cam 14 is in contact with the actuator 22 of the micro switch 21, the micro switch 21 remains in the on state for a while, and the rotary blade 3 continues to rotate. Of.

When the switch cam 14 rotates to the position shown in FIG. 8F, the contact surface of the switch cam 14 with the actuator 22 shifts from the large diameter cam surface 14a to the small diameter cam surface 14b. The micro switch 21 is turned off, and the drive motor 6 and the rotary blade 3 are stopped. That is, the state returns to the above state (A).

By the above operation, the paper (P) is detected by the paper detection plate 9
After passing through, as shown in FIGS. 8D to 8F, while the switch cam 14, that is, the rotary blade 3 rotates for more than half a rotation,
The micro switch 21 maintains the ON state, and the drive motor 6 and the rotary blade 3 continue to rotate. Therefore, it is possible to surely cut up to the end of the paper.

In the above embodiment, the effective lengths of the cam surface 14a having a large radius and the cam surface 14b having a small radius are changed, and the switch cam 14 is attached to the rotary shaft 3a of the rotary blade 3.
It is possible to further adjust the duration of the ON state of the microswitch 21, that is, the duration of rotation of the drive motor 6 by further reducing the speed and connecting it through an appropriate gear, instead of directly connecting to.

Further, FIGS. 9A and 9B show another embodiment of the start lever stopper 16, in which the locking member 23 corresponding to the locking projection 19 in the above embodiment is attached to the movable piece 16a. It is provided directly on the tip of the. That is, when paper is inserted, the start lever 13 rotates according to the movement of the paper detection plate 9 as shown in FIG.
At this time, the start lever 13 moves the sliding surface 2 of the locking member 23.
It slides on 3a and moves forward while pushing the entire movable piece 16a backward, and the movable piece 16a returns to its original state by its elastic force after the start lever 13 has completely passed. After that, the same movement as in the above-described embodiment is performed, and even when the paper is finished, the locking surface 23b of the locking member 23 prevents the start lever 13 from returning, and the rotation plate 3 continues to rotate. After that, when the push-up protrusion 15 of the switch cam 14 pushes up the release protrusion 20 of the start lever stopper 16, the locking member 2
Since the lock of 3 is released, the start lever 13 returns to the initial state by the moment.

In the present embodiment, since the structure of the locking member 23 does not require the swing shaft 17 and the like, and the structure is extremely simple, the manufacturing cost and the like can be reduced. However, in this case, when the start lever 13 rotates and pushes the locking member 23 outward, it is necessary to overcome the elastic force of the movable piece 16a to rotate and move it forward. The thickness of the paper is such that the paper detection plate 9 can be pushed in.

[0029]

As described above, the automatic start / auto stop mechanism of the shredder according to the present invention has a simple action of allowing the rotary blade to continue rotating for a certain period of time even after the end of the paper is detected. Since it is realized by the cam mechanism and does not rely on a separate electric circuit or the like as in the conventional case, it is possible to provide a shredder equipped with an auto start / auto stop mechanism at an extremely low cost.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing a shredder to which the mechanism of the present invention is applied.

FIG. 2 is a front view schematically showing a shredder to which the mechanism of the present invention is applied.

FIG. 3 is a partially enlarged view of part A of FIG.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a sectional view of a switch cam.

6A is a perspective view of the rocking piece, and FIG. 6B is a cross-sectional view of the rocking piece.

FIG. 7 is an explanatory diagram of a locked state of the swing piece.

FIG. 8 is an explanatory diagram of a series of operations of a start lever, a micro switch, and a cam mechanism.

FIG. 9A is a front view of another embodiment of the locking projection,
(B) Partial enlarged view of the locking projection

FIG. 10 is an operation explanatory view of another embodiment of the locking protrusion.

[Explanation of symbols]

 8 Paper Input Port 9 Paper Detection Plate 10 Transmission Shaft 12 Detection Plate Protective Frame 13 Start Lever 14 Switch Cam 15 Push Up Protrusion 16 Start Lever Stopper 16a Movable Piece 18 Swinging Piece 19 Locking Protrusion 20 Micro Switch 22 Actuator

Claims (3)

[Claims] 1. A paper detection plate provided so as to project into a paper input port,
It is fixed to one end of a transmission shaft that is rotatably supported by the detection plate protection frame, and a start lever is fixed to the other end of the transmission shaft so that the paper detection plate and the start lever can rotate together. A micro switch actuator is exposed to the front of the switch cam, and a push-up protrusion is provided in the circumferential direction on the outer surface of the switch cam that rotates in conjunction with the rotary blade to operate the actuator. At the tip of the movable piece, a locking projection protruding into the rotation area of the start lever is provided, and at the same time, a release projection is provided on the outer surface of the switch cam at a position where it can abut. Shredder auto-start / auto-stop mechanism. 2. A swinging shaft is installed on the tip of the movable piece, and a swinging piece which is swingable about the swinging shaft is attached to the lower end of the movable piece. The shredder auto-start / auto-stop mechanism according to claim 1, wherein a locking projection is provided. 3. A shredder auto-starting apparatus according to claim 1, further comprising a locking member having a slidable front surface and a rear locking surface provided directly on the tip of the movable piece.
Auto stop mechanism.