JPH0418902B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a cutting machine (shredder) equipped with a paper feeding mechanism.

<Prior art> A cutting machine equipped with a paper feeding mechanism is patented in West Germany.
Disclosed in DE2214799.

According to the West German patent, the paper feed tray on which documents are set is always biased by a spring in the direction in which the feed roller is provided, and the document set on the paper feed tray is pushed upward by the feed roller. A more appropriate amount is fed towards the cutter. The document fed to the cutter is cut into small pieces by the cutter.

In this way, the paper feed tray is always urged in the direction of the feed roller by the spring, so in order to set a document on the paper feed tray, the paper feed tray must be pushed down by hand. First, there is the problem of extremely poor operability.

Furthermore, when the cutter is reversed, the documents on the cutter and the feed roller flow backwards toward the paper feed table, so there is no space for the documents flowing backwards to be returned, which can cause problems such as paper jams. This was the cause of the occurrence.

Furthermore, when a trouble occurs, if the trouble is resolved, the cutting process will start immediately.
It's very dangerous.

Furthermore, if the document set on the paper feed table is not fed due to a failure of the feed roller, the paper feed trouble cannot be detected, resulting in very poor workability and operability.

<Object of the Invention> In view of the above-mentioned circumstances, the present invention enables documents to be placed on the paper feed tray by controlling the elevation of the paper feed tray in conjunction with the opening/closing operation of the paper feed tray cover that covers the paper feed tray. The purpose is to make it easy to set up.

Another object of the present invention is that when there are no documents on the paper feed tray, the paper feed tray is lowered so that documents can be set immediately even if the paper feed tray cover is opened.

Still another object of the present invention is to lower the paper feed table when reversing the cutter for cutting the document, thereby creating a space between the top of the document and the document feeding means; The purpose is to secure a space for documents to flow backwards and to prevent paper jams from occurring.

Still another object of the present invention is to lower the paper feed table when a trouble is detected.
The purpose is to be able to deal with trouble immediately and to prevent cutting from starting immediately after the trouble is resolved.

Still another object of the present invention is to immediately stop the feeding operation when a trouble in the paper feeding mechanism is detected.

Still another object of the present invention is to provide a plurality of paper feed ports, so that even if a paper feed unit having one of the plurality of paper feed ports stops due to a problem, the other paper feed port is not activated. The object of the present invention is to improve cutting efficiency by making it possible to perform cutting processing using a paper feeding section that has a paper feed section.

<Example> Hereinafter, the configuration of the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of a cutting machine according to an embodiment of the present invention, and FIG. 2 is a schematic sectional view of the cutting machine.

In the figure, 1 represents the main body of the cutting machine. The cutting machine main body 1 includes two paper feed ports, that is, a first paper feed port 2 and a second paper feed port 3.

The first paper feed port 2 includes a paper feed tray 4 on which a discarded document is placed, and a paper feed tray cover 5 that covers the paper feed tray 4. A large amount of documents can be set in the first paper feed port 2, and a feed roller 7 is provided for feeding the set documents in appropriate amounts to cutters (cutting sections) 6a and 6b. As shown in the figure, the cutting section consists of a pair of rollers 6a and 6b, and the rollers 6a and 6b are driven by a motor 8.
It rotates by the drive of.

On the other hand, the second paper feed port 3 is used when cutting two to three sheets of documents. That is, when a document to be discarded by cutting is inserted into the second paper feed port 3, the cutters 6a and 6b sequentially cut the document.

Hereinafter, a paper feeding section including the feeding roller 7 and a feeding mechanism for feeding set documents to the cutting sections 7a and 7b will be described as a first paper feeding section and a second paper feeding port 3. The paper feeding section is called a second paper feeding section.

As mentioned above, if there are two paper feed sections, the first paper feed section and the second paper feed section, while the document is being cut by the first paper feed section, if there is a document that needs to be cut urgently, For example, the paper is fed into the second paper feed section. Further, in parallel with the cutting process from the first paper feeding section, urgent documents can also be cut.

In addition, when cutting continuous paper such as computer form paper, the continuous paper is set on the setting tables 10a and 10b supported by the support rod 9, and the leading end of the set continuous paper is cut into the second feeder. Insert the paper into the paper section and perform the cutting process.

The documents fed into the cutters 6a and 6b are stored in the lower part 11 of the main body after being cut.
The front door 12 of the lower part 11 of the main body has a structure that can be opened, and the shredded waste stored in the lower part 11 of the main body (correctly, the bag provided in the lower part 11 of the main body) can be disposed of as appropriate. It's becoming like that.

In the figure, 13 is an operation panel, and 14 is a display section for displaying the operating status of the cutting machine. Further, the paper feed tray cover 5 is provided with a window portion 15 made of a transparent material, so that even when the paper feed tray cover 5 is closed, the amount of documents set in the first paper feed portion is not visible to the outside. It's starting to look like this.

A perspective view of the first paper feeding section is shown in FIG.

In the figure, reference numeral 16 denotes a DC motor, and the driving force of the DC motor 16 is transmitted to the rotating shaft 18 through the reduction gear unit 17. Can rotate.

The paper feed tray 4 is provided with a recess 19 for reinforcement, and is further provided with an actuator 20 for detecting whether or not there is a document on the paper feed tray 4.

The driving force of the synchronous motor 21 is transmitted to the rotating shaft 22 through a speed reduction mechanism (not shown).

A feeding roller 23 is fixed to the rotating shaft 22. Moreover, the arm 2 is
4 is attached freely.

A shaft 25 is attached to the other end of the arm 24, and feeding rollers 7 are provided at both ends of the shaft 25.

Furthermore, since the rotational force of the rotating shaft 22 is transmitted to the shaft 25 via the belt 26, when the synchronous motor 21 rotates, not only the conveying roller 23 but also the feeding roller 7 rotates.

In the figure, 27 is an actuator for detecting the top position of the document placed on the paper feed table 4. Further, 28 is a guide for guiding the document to the paper feed tray 4, and 29 and 30 are guides for guiding the document to the paper feed tray 4.
This is a guide that guides the document set above to the cutting section.

Next, details of the paper feeding section and cutting section of the cutting machine of this embodiment will be explained using FIGS. 4 to 6. Already available parts are given the same reference numerals.

In addition to the cutters 6a and 6b, guide plates 32 and 33 are fixed to the cutter fixing frame 31. This cutter fixing frame 31 is
It is fixed to a lower unit 35 via a vibration isolating rubber 34.

The rotating shafts 18 and 22, the guide 28, the paper feed tray cover 5, the guides 29 and 30, etc. that constitute the first paper feed section are attached to the paper feed frame 36.
Further, the paper feed frame 36 is attached to the lower unit 35 without using the vibration isolating rubber 34.

Here, the lower unit 35 is a wooden casing that surrounds a garbage bag (box) on six sides, and is provided with an openable door 12 in the front, and the cutter 6a, 6b is provided in the upper part. An opening 37 is formed through which the cut waste passes.

FIG. 4 shows the paper feed tray cover 5 in an open state. When the paper feed tray cover 5 is opened, the cover switch CSW 38 is turned off and the paper feed tray 4 is moved downward. And the arm 2
A protrusion 39 formed at one end of the guide 1
7, the feed roller 7 is stopped at the position shown in the figure.

In addition, a switch 40, a switch 41, a switch 42, a switch 43, and a switch 44 are provided.

The switch 40 is provided to detect whether a document is inserted into the paper feed port 3 or not.

Further, the switch 41 is provided to detect whether or not a document exists on the conveyance path between the guide 29 and the guide 30, that is, the presence or absence of a document.

Furthermore, the switch 42 is provided to detect that the paper feed table 4 is at the lowest position shown in FIG.

Furthermore, the switch 43 is provided to detect the presence or absence of documents on the paper feed tray 4.

Further, the slider 44 is provided to detect the top position of a large amount of documents stacked on the paper feed tray 4.

Figure 5 shows a large amount (300 to 500 sheets) on the paper feed tray 4.
After setting the document 45, remove the paper feed tray cover 5.
Shows the closed state.

At this time, the top of the document 45 operates the actuator 27, and the switch 44 is activated.
The top of the paper feed tray 4 rises until it is turned on. Note that a spring 46 is attached to the lower part of the paper feed tray 4, which is connected to the DC motor 1.
This was installed as an auxiliary device to reduce the power of the 6.

The sixth example shows a state in which there are several documents on the paper feed table 4.

Here, as can be seen by comparing the position of the feeding roller 7 in FIG. 5 and FIG. 6, the larger the amount of documents set, the more the feeding roller 7
position becomes higher. This is because the height of the leading edge of the paper feed is used as a reference.

As is clear from the figure, the paper feed tray cover 5 is rotatable around the fulcrum 47, and the cover switch CSW 38 is pressed on the side of the paper feed tray cover 5 where the cover portion is not formed. A member 48 is provided. The pressing member 48 does not press the cover switch CSW 38 when the paper feed tray cover 5 is open, and on the contrary, does not press the cover switch CSW 38 when the paper feed tray cover 5 is closed. Press.

FIG. 7 shows the control of the cutter motor 8 for rotating the cutters 6a, 6b, the control of the synchronous motor 21 for rotating the feed roller 7, and the power supply circuit.

In the figure, 49 is an AC power supply, 50 is a main power switch, 51 is a transformer, 52 is a switch for changing the power supply voltage in response to the fact that commercial power supply voltage differs depending on the country, and 53 and 54 are switches from AC to DC. The DC converters 55 and 56 for conversion are, respectively,
A switch detects the opening of the door 12, and a switch detects a temperature rise of the cutter motor 8.

Also, in the figure, , , are inverted signals of the cutter motor drive signal MFR, the cutter motor reverse rotation signal MRR, and the paper feed signal PFR, respectively.

Therefore, when is "L" and is "H",
The cutter motor 8 rotates normally;
When is "L" and is "L", the cutter motor 8 rotates in reverse.

When is "L", the motor 21 rotates.

In addition, in the same figure, 57, 58, 59, 60
is a normally open contact, and 61 and 62 are normally closed contacts.

<Position control of paper feed tray 4> The paper feed tray 4 is controlled when the paper feed tray cover 5 is open, when there is no document on the paper feed tray 4, and when the cutters 6a and 6b are reversed. , and is controlled to descend in both cases of paper feeding errors.

In addition, when a document is set on the paper feed table 4, the actuator 27 is operated to raise the top of the document until the switch 44 is turned on.

<Drive control of cutter motor 8> When the switch 40 or switch 44 is ON
The cutters 6a, 6b rotate when the switch 40 or 44 is turned off and until a certain period of time has elapsed after the switch 40 or 44 is turned off. However, if an overload is applied to the cutters 6a, 6b during the cutting process, the cutters 6a, 6b stop rotating. In this state, for example, even if a document is inserted into the paper feed port 3, the cutters 6a and 6b do not rotate. In this case, the cutting process cannot be performed unless the reverse rotation switch is pressed once to reverse the cutters 6a and 6b.

<Control of Feeding Mechanism> When paper is set on the paper feeding table 4, the feeding roller 7 and the conveyance roller 23 perform a feeding operation.

However, the paper feeding operation will stop in the following cases.

(i) If the document does not pass through the conveyance path pinched by the guides 29, 30 even after a predetermined period of time has elapsed after the start of the paper feeding operation; (ii) If the document does not pass through the conveyance path pinched by the guides 29, 30; (iii) When there are no more documents on the paper feed tray 4 (Parallel cutting from two paper feed trays) Processing> The documents set on the paper feed table 4 and the documents inputted from the paper feed port 3 can be simultaneously cut by the cutters 6a and 6b.

Furthermore, even when the first paper feeding unit is unable to feed paper due to a paper feeding error or the like, the cutters 6a and 6b are configured to rotate when the switch 40 is turned on, so that the cutters 6a and 6b can be rotated from the paper feeding port 3. cutting process can be performed.

Next, control circuit diagrams for performing the above-described control are shown in FIGS. 8 to 14. Time charts of each circuit are shown in FIGS. 15 to 18.

In the circuit shown in FIG. 8, 63 is a timer circuit, and the details of the timer circuit 63 are shown in FIG. Further, the input/output relationship of the timer circuit 63 is shown in FIGS. 19a and 19b.

For example, as shown in FIG _.
If the level becomes "L" above, the output becomes "L" until the input becomes "H" again after the predetermined time _T1 has elapsed. Further, as shown in FIG. 5B, if the input remains at "L" within the predetermined time _T1 , the output remains at "H" without any change. The predetermined time T ₁ can be changed by selecting the resistor 64 and capacitor 65.

Also, Fig. 10 shows the input circuit of the switch BSW that detects when the cutting waste is full. When the cutting waste becomes full, the switch BSW turns ON and the output of the inverter 66 becomes "H", indicating that it is full. signal
Set to FULL.

FIG. 11 shows the input circuit of the start/stop key STK.

In the figure, 67 is a J- with clock pulse input terminal.
It is a K flip-flop, and when a rising signal is input to the CP terminal, its output Q inverts the previous output and outputs it. However, the preset input terminal
When a rising signal is input to PR, output Q becomes "H" regardless of the output state at that time. Also, when a rising signal is input to clear terminal CLR, output Q becomes "H" as described above. It becomes "L" regardless of the output state at that time.

The output Q of the flip-flop 67 is assumed to be a signal. Therefore, when no rising signal is input to the PR terminal and CLR terminal, the signal will be inverted every time the start/stop key is pressed.

FIG. 12 shows a detection circuit when a large amount of documents are fed into the cutters 6a, 6b and the motor 8 is overloaded.

In the figure, MI is a signal indicating a voltage proportional to the amount of current flowing through the motor 8. The motor 8
When a current exceeding a predetermined amount flows through the comparator 68
The output of the timer 69 becomes "H", and the signal output from the timer 69 becomes "L". The timer 69 is provided for noise removal and is not particularly necessary. However, the delay time of the timer 69 is several tens to hundreds of milliseconds.

Normally, the output of the NAND gates 70 and 71 is
They are "L" and "H", respectively. At this time, the motor 8 is overloaded and the timer 6
When the output of the NAND gate 9 becomes "L", the output of the NAND gate 70 becomes "L", and the output of the NAND gate 71 becomes "H". The NAND gate 70,7
The output signals of 1 are respectively OVER.

Therefore, when the motor 8 is overloaded,
The OVER signal becomes "H" and its inverted signal becomes "L", and when the output of the NOR gate 72 becomes "H" in this state, the OVER signal becomes "L".

As will be described later, the NOR gate 72 receives input of C in response to the reverse rotation signal of the cutters 6a and 6b and a reset signal generated when the main power is turned on.

Figure 13 shows a circuit for generating a reset signal when the main power switch is turned on.

When the main power source 50 is turned on, as is clear from the figure, the comparator 73 outputs a signal that becomes "L" only for a predetermined time after the power source is turned on. this,
Use as RESET signal.

FIG. 14 shows a circuit for detecting the temperature rise of the motor 8.

When the door 12 is closed, the door switch 55 is closed and the THP terminal outputs a voltage of 24V. When the temperature of the motor 8 rises, the thermoswitch 56 is opened and the output voltage of V becomes OV.

Therefore, when the thermo switch 56 is opened, the output of the comparator 74 becomes "H".

Normally, the voltage divided by resistors 75 and 76 is
Since the voltage is set to be lower than 24V, the output of the comparator 74 becomes "L".

In the figure, 75 to 112 are gate circuits, 113 is a normally open contact, 114 and 115 are changeover switches, and 116 to 120 are timers.

Next, the operation of the above-mentioned control circuit will be explained using the time charts shown in FIGS. 15 to 18.

The time chart in FIG. 15 shows that: Time t ₁ : The paper feed cover 5 is opened (the switch 38 is OFF).

Time t ₂ : The discarded document is set on the paper feed tray 4 (the switch 43 is turned on).

Time t ₃ : The paper feed tray cover 5 is closed (the switch 38 is turned on).

Time t ₄ : Start cutting (switch 44 is turned on).

Time t ₅ : The paper feed tray cover 5 is opened during the cutting process (the switch 38 is OFF).

Time t ₆ : After adding the discarded documents, close the paper feed tray cover 5 (the cover 38 is ON).

Time _t7 : All the discarded documents on the paper feed table 4 have been fed (the switch 43 is turned off).

Time _t8 : After a predetermined period of time has elapsed from time _t7 , the cutters 6a and 6b stop, and the cutting process ends.

This represents the operation of

When the paper feed tray cover 5 is opened at time _t1 , the output of the inverter 78 becomes "L". At time _t2 , when the discarded document is set on the paper feed table 4, the switch 43 is turned on, and the inverter 77 is turned on.
The output becomes "H".

At time _t3 , when the paper feed tray cover 5 is closed, the output of the inverter 78 becomes "H",
The output of the AND gate 97 becomes "H", and until the switch 44 is turned on, that is, until the output of the inverter 81 becomes "H",
Since the output of No. 2 becomes "L", the normally open contact 113 is closed, the DC motor 16 is rotated in the forward direction, and the paper feed table 4 is raised. At time _t4 , the top of the document set on the paper feed tray 4 operates the actuator 27, turning on the switch 44,
The output of the inverter 81 becomes "H". and,
PFR, both become "L", the synchronous motor 21 and the cutter motor 8 start rotating, and the document set on the paper feed table 4 is cut.

During this cutting process, when the paper feed tray cover 5 is opened at time _t5 , the output of the AND gate 97 becomes "L", and the outputs of the inverters 100 and 102 remain "L" until the switch 42 is turned ON. Therefore, the switching segments 114 and 115 are switched,
The DC motor 16 rotates in reverse, and the paper feed tray 4 descends to the lowest position.

When additional documents are added to the already set documents and the paper feed tray cover 5 is closed at time _t6 (the switch 38 is turned on), the inverter 102 keeps "L" until the switch 44 is turned on. The sheet is output, the sheet feed table 4 is raised, and the cutting process is performed. At time _t7 , when all the documents have been fed onto the paper feed tray 4, the switch 43 is turned on.
The output of the inverter 77 becomes "L".
After that, the time set by the timer 120 (approximately 3
seconds), it becomes "H" and the cutters 6a, 6b rotate until then.

In FIG. 16, the time chart shows that the cutting process from the first paper feeding section is continuing, and at time _t1 : the cutting processing from the second paper feeding section starts.

Time t ₁₂ : The above cutting process ends.

Time t ₁₃ : Paper feeding trouble occurs in the first paper feeding section.

Time t ₁₄ : The cutting process from the second paper feed section is resumed.

Time t ₁₅ : The paper feed cover 5 is opened.

Time _t16 : The above cutting process ends.

It represents the time of.

During the cutting process from the first paper feed section, when a document is input from the second paper feed section (the paper feed port 3) at time _t11 , the switch 40 turns ON and the output of the inverter 82 becomes "H". .

The documents sent from the first paper feed section and the documents input from the second paper feed section are simultaneously cut by the cutters 6a and 6b.

At time _t12 , cutting from the second sheet feeding unit ends.

At time _t13 , when a paper feeding trouble occurs in the first paper feeding section, ERJ becomes "H" and becomes "H".
The synchronous motor 21 then stops (the cutting process from the first sheet feeding section is interrupted).

In this way, when a paper feeding problem occurs in the first paper feeding section,
When a document is input from the second paper feed section (paper feed port 3) at time _t14 , the output of the NOR gate 105 is
“L” regardless of the output of AND gate 104
Therefore, becomes "L", the cutter motor 8 rotates, and the cutting process from the second paper feeding section can be performed.

At time _t15 , when the paper feed tray cover 5 is opened, ERJ becomes "L" and the trouble is resolved. Then, when the trouble is removed and the paper feed table cover 5 is closed, cutting from the first paper feed section is started again.

In FIG. 17, time t ₂₁ : The motor 8 is overloaded.

Time t ₂₂ : Reverse key turns ON.

Time t ₂₃ : The reverse key turns OFF.

It represents the time.

When the motor 8 is overloaded at time _t21 during the cutting process from the first sheet feeding section, the overload signal OVER becomes "H", and the inverter 100,
Since both outputs of 102 become "H", the paper feed tray 4 is lowered.

At time _t22 , when the reverse key is pressed, becomes "L" and the cutters 6a, 6b are reversed. At this time, the overload signal OVER becomes "L" and is reset.

In this way, troubles caused by overload can be reset by operating the reverse key.

Further, the cutters 6a and 6b rotate only when the reverse rotation key is pressed.

FIG. 18 is a time chart showing the detection of paper feed trouble. Time t ₃₁ : The paper feed table cover 5 is opened.

Time _t32 : Set the documents.

Time _t33 : The paper feed tray cover 5 is closed.

Time _t34 : The leading edge of the preceding paper is detected.

Time _t35 : After the time set by the timer 116 (approximately 3 seconds) has elapsed since time _t34 , the leading edge of the following paper is not detected, so a paper feeding problem is detected.

Time _t36 : Open the paper feed tray cover 5 (resolve the paper feed trouble).

Time _t37 : Close the paper feed tray cover 5 and continue cutting.

It represents the time of.

Times t ₃₁ to _{t 33} are the same as t ₁ to _{t 3} in FIG. 15. At time _t34 , when the output of the inverter 79 becomes "L", this means that the trailing edge of the preceding paper is detected by the switch 41, and at time _t35 , after a predetermined period of time has elapsed, the output of the inverter 79 becomes "H". ”, the output of the timer 116 becomes “L”, and the outputs of the AND gates 86 and 87 are
They become "L" and "H", respectively. Also, inverter 10
Since the outputs of 0 and 102 are both "L", the paper feed table 4 is lowered.

<Effects> As described above, according to the present invention, in a cutting machine equipped with a feeding mechanism that feeds documents stacked on a paper feed tray from the upper portion in an appropriate amount toward the cutter using a feeding roller, A moving means is provided for moving the paper feed tray in a direction away from the feed roller when the cutter reverses, and when the cutter reverses, the uppermost portion of the documents stacked on the feed roller and the paper feed tray is provided. Since a space is formed between the cutter and the cutter, when the cutter rotates in the opposite direction to the cutting direction, a space is secured for the documents to flow backwards, preventing paper jams and making it easier to use. Above, it is convenient.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a cutting machine according to an embodiment of the present invention, FIG. 2 is a sectional view of the cutting machine, FIG. 3 is a diagram showing the structure of the first paper feed section of the cutting machine, and FIG. 6 to 6 are diagrams for explaining the structure of the paper feeding section and cutting section of the cutting machine, FIGS. 7 to 14 are circuit diagrams configuring the cutting machine, and FIGS. 15 to 18 are circuit diagrams. FIG. 19 is a time chart showing the operation of the circuit, and FIG. 19 is a diagram showing input and output waveforms of the circuit. 1... Cutting machine main body, 2... First paper feed port, 3...
2nd paper feed port, 4... Paper feed stand, 5... Paper feed stand cover, 6a, 6b... Cutter, 7... Paper feed roller, 8... Motor, 16... DC motor, 18... Rotating shaft, 20... Actuator, 21... Synchronous motor, 22... Rotating shaft, 23... Conveyance roller, 24... Arm,
25... Axis, 26... Belt, 27... Actuator, 28... Guide, 29, 30... Guide, 31... Cutter fixing frame, 32, 33
... Guide plate, 35 ... Lower unit, 36 ... Paper feed frame, 38 ... Cover switch, 39 ...
Projection, 40, 41, 42, 43, 44...Switch, 45...Document, 46...Spring, 49
...AC power supply, 50...Main power switch, 55...
...Switch, 56...Switch, 57, 58, 5
9, 60... Normally open contact, 61, 62... Normally closed contact, 63... Timer circuit.

Claims (1)

[Scope of Claims] 1. In a cutting machine equipped with a paper feeding mechanism that feeds documents stacked on a paper feeding table from above in appropriate amounts toward a cutter using a feeding roller, when the cutter reverses, A moving means is provided for moving the paper feed tray in a direction away from the feed roller, and when the cutter is reversed, a space is created between the feed roller and the top of the documents stacked on the paper feed tray. A cutting machine characterized by being shaped so that