JPS6393359A - Paper-clogging detector for document shredder - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention provides a document shredding 11' for shredding documents for disposal. <Relating to a paper jam detection device for a shredder.

BACKGROUND OF THE INVENTION Conventional document shredding machines are broadly classified into three types: manual paper feeding, automatic paper feeding, and dual paper feeding with automatic paper feeding and automatic paper feeding.

However, in dual-feed document shredding machines, even though there are many paths for transporting shredded paper, even if a paper jam occurs in one of those paths, it will not be displayed at all, or the paper jam indicator will simply indicate that the paper is jammed. It only shows what is happening. Note that if a paper jam occurs in a pair of rotary shredding blades located after the conveyance path, the load on the shredding blade drive motor will increase, so a device that detects this and indicates a paper jam is not generally adopted. There is.

Problems to be Solved by the Invention As mentioned above, when the number of conveyance paths increases, even if paper jam I) occurs, the location of the paper jam is unknown, and the user has to decide between the manual conveyance path and the automatic conveyance path. There is a problem in that it is necessary to check everything, which makes the work complicated.

Furthermore, in a device that detects paper jams based on load fluctuations in the motor of the shredding blade, the conveyance device continues to operate even if a paper jam occurs, so there is a problem that the conveyance device may be damaged.

Therefore, the present invention has been developed to detect where a paper jam has occurred in a manual conveyance path or an automatic conveyance path, and to display the position to the user using a paper jam location display device, thereby making it possible to easily clear the paper jam. The purpose is to provide a clogging detection device.

<Means for Solving the Problems> The means for solving the problems according to the present invention are as follows: the top perspective view of a document shredding machine equipped with a paper jam detection device shown in FIG.
As shown in the cross-sectional view and the front view of the same map-type paper jam location display device in FIG. Paper jam detectors C and D are respectively provided, and a paper jam location display device 4 is provided for displaying the paper jam location when these paper jam detectors detect a paper jam.

In the above problem solving means, if the first detection switch 15 does not detect rotation after a certain period of time after the basket switch 14 constituting the paper jam detector C is turned on, or the rotation stops midway. In this case, the control circuit determines that a paper jam has occurred between the basket switch 14 and the first detection switch 15 of the automatic conveyance path A. Then, the first and second indicator lights L1 and L2 of the paper jam location display device 4 are turned on to notify the user that a paper jam has occurred in the automatic conveyance path A, and at the same time, the clutch of the conveyance device is released.

In addition, in the manual conveyance path B, the second detection switch 22
A paper jam is determined if the third detection switch 23 does not turn on after a certain period of time after it was turned on, or if the third detection switch 23 remains on and turns off due to the rotation of the detection roller 24 of the second detection switch 22 stopping. . and,
Third and fourth indicator lights L3. L4 is turned on to notify that a paper jam has occurred, and the clutch of the conveying device 20 is released.

<Example> Hereinafter, an example according to the present invention will be described with reference to the drawings. 1st
The figures are a top perspective view of a document shredding machine equipped with a paper jam detection device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the same, FIG. The figures are perspective views of the first detection switch and the second detection switch, FIG. 5 is a block diagram of the control circuit, and FIGS. 6 and 7 are flowcharts of the control circuit. In the illustrated document shredding machine, the paper jam detection device includes an automatic conveyance path A from the automatic paper feed port 2a of the shredded paper 1 to a pair of rotary shredding blades 3, and a manual paper feed port 2b. First and second paper jam detectors C and D are provided respectively in the manual conveyance path B leading to the shredding blade 3, and when these paper jam detectors C and D detect a paper jam, they detect the paper jam location. A paper jam location display device 4 is provided to display the paper jam location.

The automatic conveyance path A is arranged at the upper stage of the main body upper part 5, and includes a shredded paper stacking device 6, a first conveyance roller 7a adjacent to this, and a second conveyance roller 7 on the rear side.
b, a double-feed prevention brake 8 made of an elastic plate that comes into contact with the roller 7b, and a guide plate 9 that guides the shredded paper 1 between the second conveyance roller 7b and the shredding blade 3.

The shredded paper stacking device 6 includes an upper open type basket 10 fixed to the second part 5 of the main body, and the basket
10, a compression spring 12 interposed between the station 11 and the bottom plate of the basket 10, and a hinge attached to the automatic paper feed slot 2a in the upper part 5 of the main body so as to be freely openable and closable. It consists of a supported basket cover 13.

The paper jam detector C of the automatic conveyance path A is composed of a basket switch 14 and a first detection switch 15. The basket switch 14 includes a swingable detection arm 14a on the upper body 5, a return spring for the arm 14a, and a contact that turns on and off as the arm 14a swings.

Further, the manual conveyance path B is arranged at the lower stage of the main body upper part 5, that is, below the automatic conveyance path A, and the manual conveyance path B
are the manual paper feed port 2b at the front of the upper part 5 of the main body, and the paper feed port 2
It consists of a manual feed switch 16 arranged on the rear side of b, a pair of drive rollers 17, an endless belt 18 wound around these, and a presser roller 19 that presses the shredded paper 1 against the belt 18. a conveyance device 20 and the device 20
A pair of guide plates 21 spanned between the rear end and the shredding blade 3
It consists of

The paper jam detector in the manual feed path B includes the manual feed switch 16, a second detection switch 22 disposed above the belt 18, and a third detection switch 23 disposed on the guide plate 21. It consists of

The manual feed switch 16 has a swingable arm 1.
6a, the return spring of this arm 16a, and the arm 16a4.
! It consists of contacts that turn on and off depending on the movement. The third detection switch 23 includes a swingable arm 23a and this arm 23.
It consists of a return spring a and a contact that turns on and off as the arm 23a swings.

Further, as shown in FIG. 4, the first detection switch 15 and the second detection switch 22 each have a cylindrical conveyance detection roller 2 that rotates when it comes into contact with the shredded paper 1 when the shredded paper passes through.
4 (this roller may have a grooved cylindrical shape or the like), and a toothed wheel 26 fixed to the pongee 25 of the detection roller 24, and a 7-oto coupler 27 (7) that electrically detects rotation by the toothed wheel 26 and its teeth 26a. encoders 15a and 23a (reed switches, etc.). 28
are the shredding blade 3 and the conveyance roller 7 at 7 b.
+ 17, a main motor that drives the conveyor belt 20, etc.; 29, a shredded chip storage box;

The paper jam location display device 4 is disposed on the front side of the operation switch 30 on the upper surface of the main body 5, and as shown in FIG.
, the display section 3a of the shredding blade 3, the first indicator light (LDE) Ll arranged in the basket switch display section of the automatic conveyance path A, and the first detection switch display section of the automatic conveyance path A. a second indicator light L2 arranged on the second detection switch display section of the manual conveyance path B;
It consists of a fourth indicator light L4 arranged on the third detection switch display section of the manual conveyance path B.

FIG. 5 is a block diagram of the entire control circuit of the document shredding machine including the paper jam detection device.The control microcomputer has a CPU connected to a ROM and a RAM. display board 31, basket switch 1
4. First detection switch 15 and second detection switch 22
The encoders 15a, 22a, the manual feed switch 16, and the third detection switch 23 are connected to the main motor 28, and the conveyance roller 7 of the automatic conveyance path A.
electromagnetic clutch E1 of a, electromagnetic clutch E2 of the drive roller 17 of manual conveyance path B, first, second, third, fourth indicator light L1
-L4 are connected to each other.

Next, the effect will be explained. First, to explain the case of automatic paper feeding, turn on the power switch and open the basket cover 13. Then, the station 11 is pushed down by an interlocking mechanism (not shown) with the cover 13, so the basket switch 14 remains in the OFF state, and the number of shredded sheets that can be stored above the station 11 is reduced. Put into basket 10. Then, cover 13 is closed. Then,
Pushed up by the force of the station 11 spring 12, the topmost shredded paper 1 contacts the automatic conveyance roller 7a and at the same time contacts the arm 14a and swings it to the on side, so the basket switch 14 is turned on. do.

Then, the clutch E1 of the automatic conveyance roller 7a is engaged and the shredded paper 1 is conveyed. Then, the shredded paper 1 is sent out one by one by transport rollers 7a and 7b, and is prevented from being electrically transported by the double-feed prevention brake 8. Then, while rotating the detection roller 24 of the first paper jam detector C, the paper is sent between the pair of shredding blades 3 and shredded. At this time, if the first detection switch 15 does not detect rotation after a certain period of time after the basket switch 14, which also serves as a start switch, is turned on, or if the rotation stops midway,
The control circuit determines that a paper jam has occurred in the basket switch 14 and first detection switch 15 of the automatic conveyance path A. The first and second indicator lights Ll of the paper jam Q location display device 4
, L2 are turned on to notify the user that a paper jam has occurred in the automatic transport path A, and at the same time, the clutch E1 of the transport device is disengaged.

To explain this with respect to the block diagram in Figure 5 and the 70-chart in Figure 6, when the power is turned on, the CP
U controls each component according to the program in the ROM. First, counters i and j are set to "0". In addition, all seven lugs of the basket switch 14, first detection switch 15, manual feed switch 16, and second detection switch 22 are turned off to "0".

Then, when the basket switch 14 indicates that there is shredded paper, the basket switch flag is turned on to "1" and the counter i is incremented (1+1). If there is no paper to be shredded by the basket switch 14, the shredding blade is stopped and stands by. Until i=2, the T1 counter counts the T1 time and then checks whether the first detection switch 15 is turned on or off.

Note that TI>tl, and tl is the basket switch 1
4 to the first detection switch 15.

Then, if the first detection switch 15 is in the OFF state, the controller checks whether the basket switch 14 is on or off again. If the first detection switch 15 is on, the detection roller 24 should be rotating.
0" and rotate the shredding blade 3. Then, check again whether the basket switch 1 is on or off. If the counter i becomes 2, the CPU stops the shredding blade 3 and displays a paper jam (JAM display). That is, the basket switch 14 detects that there is shredded paper, and the second detection switch 22 detects that there is no shredded paper for a certain period of time, and displays a paper jam.

Next, to explain the case of manual paper feeding, when the shredded paper 1 is inserted into the paper feed port 2bi of the manual transport path B, the manual feed switch 16 is turned on because its arm 16a swings.
Since the belt 18 of the conveyance device 20 operates, the shredded paper 1
is transported and introduced into the shredding blade 3. In this process, the shredded paper 1 rotates the detection roller 24 of the second detection switch 22, which turns it on, and the shredded paper 1 swings the arm 23a of the third detection switch 23, causing the third detection switch to be turned on. Switch 23 is turned on.

However, if the third detection switch 23 does not turn on after a certain period of time after the second detection switch 22 was turned on, or if the third detection switch 23 remains on and turns off due to the rotation of the detection roller 24 of the third detection switch 22 stopping. It is determined that there is a paper jam.

And the third and fourth indicator lights L3. L4 is turned on to notify that a paper jam has occurred, and the clutch E2 of the conveying device 20 is disengaged. In addition, in the case of manual paper feeding, the "shredded paper" may be pulled out on the way, so the manual feed switch 16
is designed to handle this problem.

The case of this manual feed path B will be explained with reference to FIGS. 5 and 6. When the manual feed switch 16 indicates that there is shredded paper, the manual feed switch flag is turned on and the counter j is incremented.

If there is no paper to be shredded by the second detection switch 22, the shredding blade stops and waits for 12 hours until the counter j = 2 (T2>t2, t2 is the manual feed switch 1
6 to the second detection switch 22), and then checks whether the second detection switch 22 is on or off. If the second detection switch 22 is on, the detection roller 24 should be rotating, so the counter j should be set to "0" and the time T3 (T3>t3, t3
counts the paper feeding time from the second detection switch 22 to the third detection switch 23), checks whether the third detection switch 23 is on or off, and if the third detection switch 23 is off and there is no shredded paper. A paper jam is displayed and the third detection switch 2 is pressed.
3 is on and there is paper to be shredded, the shredding blade 3 is rotated.

Furthermore, I go back to check whether the manual feed switch 16 is on or off. If counter j becomes 2, CPU
li Shred 3 Stop the cutter and display the paper jam display.

That is, when the manual feed switch 16 detects that there is shredded paper and the second detection switch 22 detects that there is no shredded paper for a certain period of time, a paper jam is displayed.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, in the present invention, the paper jam detector in the manual conveyance path B uses a switch that is turned on when the shredded paper 1 passes, and if the paper is fed with a certain interval between each shredded paper, the number of paper jams is almost constant. A paper jam may be detected by using the switch being turned on and off depending on the time. However, with this configuration, it is not possible to handle long shredded paper 1 such as roll paper or to support overlapping paper feeding.

Furthermore, as the switches for the paper jam detectors C and D, sensors that optically detect the presence or absence of the shredded paper 1, i.e., sensors that detect changes in light in the characters or curled portions of the shredded paper 1 may be used. .

Furthermore, the paper jam location display device 4 is not limited to the map type shown in FIG. The basket switch 14. is installed near each cover or paper feed port of path A and manual transport path B, or the basket switch 14. First detection switch 15, second detection switch 22. A paper jam indicator light may be installed near the third detection switch 23 and turned on. Note that the concept of the display of the paper jam location display device 4 also includes notification by a buzzer or voice. In addition, the plurality of conveyance paths are not limited to the automatic conveyance path A and the manual conveyance path B, but also multiple automatic conveyance paths A divided by the type and thickness of the shredded paper 1, and a plurality of manual conveyance paths. It may be B.

<Effects of the Invention> As is clear from the above description, according to the present invention, the control circuit determines that a paper jam has occurred in the first conveyance path due to the action of the first paper jam detector, and displays the location of the paper jam. A paper jam occurrence indication is displayed on the first conveyance path display section of the device to notify the user. Further, the control circuit determines that a paper jam has occurred in the manual conveyance path due to the action of the second paper jam detector, and displays a paper jam occurrence indication on the second conveyance path display section of the paper jam location display device;
Notify the user. Therefore, there is an excellent effect in that the user can easily deal with paper jams.

Incidentally, in the present invention, if the shredded paper conveying device is configured to stop immediately when a paper jam occurs as in the embodiment, the damage can be prevented.

In addition, as in the embodiment, if the paper jam detector is configured with a pair of switches installed at different locations on the same conveyance path, and a paper jam is determined based on the paper feeding time between these switches, it is possible to avoid overlapping paper feeding. It can also detect paper jams when shredding paper, roll paper (computer paper), etc., greatly improving the performance of document shredding machines.

[Brief explanation of the drawing]

FIG. 1 is a top perspective view of a document shredding machine equipped with a paper jam detection device according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of the same, and FIG. 3 is a front view of the same map-shaped paper jam location display device. FIG. 4 is a perspective view of the first detection switch and the second detection switch, FIG. 5 is a block diagram of the control circuit, and FIGS. 6 and 7 are flow charts of the control circuit. 1: Shredded paper, 2a: Paper feed slot, 2b: Manual paper feed slot, 3:
Shredding blade, 4: Display device, 14: Basket switch, 1
5: First detection switch, 16 two-hand differential feed switch,
22: Second detection switch, 23: Third detection switch, A
: Automatic conveyance path, B: Manual conveyance path, C, D: Paper jam detector, L1 to L4: Indicator light. Applicant Tsunehisa Nakamura 1: Shredded paper 2 = Paper feed port 2b: Manual paper feed port 3: Shredder blade 22: Second detection switch 23: Third detection switch A: Automatic Conveyance path B: Manual conveyance path C, D: Paper jam detector L1 to L4: Indicator light Fig. 1

Claims (1)

[Claims] Paper jam detectors are installed in each of the multiple conveyance paths from the shredded paper feed port to the shredder blade, and when these paper jam detectors detect a paper jam, they display the paper jam location. A paper jam detection device for a document shredding machine, characterized in that a display device is provided.