JP2002036179A - Paper cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper cutter capable of inhibiting the bounce of a cutting machine while keeping the paper cutting performance, and reducing the power consumption. SOLUTION: A control part 11 gives the command to a motor driving part 12, and controls the driving power supplied from a power source 15 to a motor 107. That is, the heavy-current is supplied to the motor to surely start a movable blade 102 in starting, the current to the motor is reduced in cutting the paper after the starting, and the current supplied to the motor is further reduced to reduce a speed of the movable blade in returning the movable blade after the completion of the cutting. When the returning of the movable blade to a standard position is detected by a switch 108, the reverse power is applied to the motor to damp the movable blade. The power supplying time and the amount of supply power to the motor can be corrected corresponding to a temperature of the cutter part 10 or the quality of the paper to be cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cutting apparatus, and more particularly, to controlling the driving power of the cutting machine in at least three stages to maintain the paper cutting ability and suppress the bouncing of the cutting machine. The present invention relates to a paper cutting device capable of reducing electric power.

[0002]

2. Description of the Related Art A portable terminal or facsimile is equipped with a cutter for cutting a printed sheet. For example,
In a roller type cutter for cutting a sheet by moving a circular movable blade on a rail-shaped fixed blade, it is necessary to reciprocate the movable blade on the fixed blade by a motor.

In a conventional roller cutter, when the cutter is started to be used, the power supplied to the motor is increased to overcome the static friction to activate the movable blade, and thereafter the power supplied to the motor is reduced. The movable blade was reciprocated on the fixed blade.

[0004]

However, the paper is cut by the forward movement of the movable blade, and it is not necessary to cut the paper at the time of backward movement. When the power supply to the motor after the movable blade is activated is constant, At the time of the backward movement, the speed of the movable blade becomes high, so that the movable blade cannot be accurately stopped at the reference position by bouncing after reaching the reference position, and the power consumption cannot be avoided.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a paper cutting device capable of suppressing bouncing of a cutting machine and reducing power consumption while maintaining the paper cutting ability. With the goal.

[0006]

According to a first aspect of the present invention, there is provided a sheet cutting apparatus, comprising: a sheet cutting unit; a driving unit for driving the sheet cutting unit; and power supplied to the driving unit in accordance with an operation state of the sheet cutting unit. Power supply adjusting means for controlling at least three stages. In the present invention, the power for driving the paper cutting means is controlled in at least three stages.

The paper cutting apparatus according to a second aspect of the present invention further comprises a reference position detecting means for detecting that the paper cutting means is at the reference position, wherein the supply power adjusting means is configured to start at a first predetermined position when the driving means is started. The time starting power is set to a cutting power that is smaller than the starting power for at least a second predetermined time after the driving unit is started until the cutting of the sheet by the driving unit is completed. The return of the paper cutting means to the reference position is detected by the reference position detecting means to return to a return power which is smaller than the disconnection power for the third predetermined time, when the return of the paper cutting means to the reference position is detected. And a supply power adjusting means for adjusting the braking power in the opposite direction to the starting power, the cutting power, and the returning power for the fourth predetermined time.

In the present invention, the power for driving the paper cutting means is controlled in four stages of starting power, cutting power, return power and braking power. The paper cutting apparatus according to the third invention further comprises a temperature detecting means for detecting an ambient temperature of the paper cutting means, wherein the supply power adjusting means comprises a first predetermined time, a second predetermined time, and a fourth predetermined time. A temperature compensating means for compensating at least one of the time, the starting power, the disconnecting power, the returning power and the braking power according to the ambient temperature detected by the temperature detecting means is included.

In the present invention, the power supply time and power supply to the paper cutting means are corrected according to the ambient temperature of the cutting means. The paper cutting device according to a fourth aspect further comprises a paper quality setting means for setting the paper quality of the paper, wherein the supply power adjusting means is configured to control the first predetermined time, the second predetermined time, and the fourth predetermined time.
And a paper quality correction unit that corrects at least one of the starting power, the cutting power, the return power, and the braking power according to the paper quality set by the paper paper quality setting unit.

In the present invention, the power supply time to the paper cutting means and the power supply are corrected according to the paper quality of the paper to be cut.

[0011]

FIG. 1 is a block diagram of a paper cutting apparatus according to the present invention, which comprises a cutter unit 10, a control unit 11, a motor drive unit 12, a temperature sensor unit 13, and a paper quality setting unit 14. I have. The cutter unit 10 has a fixed blade 101 installed across the top of the paper 100, and a circular movable blade 102 runs along the fixed blade 101. The movable blade 102 is mounted on a carriage 103, and the carriage 103 is fitted with a spiral shaft 104. A groove is formed in the spiral shaft 104 so that the carriage 103 reciprocates along the spiral shaft 104 when rotating in one direction.

A gear 105 provided at the left end of the spiral shaft 104 is fitted with a gear 106, and the gear 106 is directly connected to a motor 107 (a DC motor or a stepping motor). That is, it is possible to reciprocate the movable blade 102 along the fixed blade 101 by rotating the motor 107 in one direction. A switch 108 which is turned off when the carriage 103 is at the reference position and turned on when the carriage 103 is apart from the reference position is provided at the right end of the cutter unit 10. The return of the position is transmitted to the control unit 11.

Instead of the above configuration, the completion of the forward movement and the backward movement of the carriage 103 may be detected by two switches. The control unit 11 is composed of, for example, a microprocessor.
OM112, RAM113, cutter interface 1
14 and an upper interface 115.

The upper interface 115 is connected to a host computer (not shown), receives a paper cutting command from the host computer, and transmits a paper cutting end signal to the host computer. The cutter interface 114 controls the motor driving power supplied from the power supply 15 via the motor driving unit 12, and also controls the internal temperature of the cutter unit 10 from the temperature sensor unit 13, the paper quality setting value from the paper quality setting unit 14, and The position of the carriage 103 is fetched from the switch 108.

FIG. 2 is a functional diagram of the paper cutting apparatus according to the present invention. The control section 11 has a drive current setting function 21, a conduction time setting function 22, and a correction function 23 incorporated therein. The drive current setting function 21 controls the switching duty ratio and the energizing direction of the switching element included in the motor drive unit 12 which is an integrated circuit element. The energization time setting function 22 controls the power supply time to the motor. further,
The correction function 23 corrects the switching frequency and the energizing time according to the temperature in the cutter unit 10 and the quality of the paper to be cut.

FIG. 3 is a flowchart of a sheet cutting control routine executed by the control unit 11 constituted by a microprocessor, which is executed as an interruption process every time a cutting command is received from the host computer. First, at step 30, a disconnection command is read from the host computer. At step 31, for example, the temperature θ inside the cutter unit 10 detected by the temperature sensor unit 13, which is a thermistor, is read. Next, in step 32, the paper quality setting value C set by the paper quality setting unit 14 is read.

In step 33, the index i indicating the sheet cutting stage is set to the initial value "1", and step 3
4, the switching duty ratio DR of the motor drive unit 12 is obtained from a table preset in the ROM 112, for example.
(I), the ON time T _ON (i) of the motor 107 and the current direction D _ON (i) are read. In step 35, it is determined whether or not the index i has reached "4". When a negative determination is made, that is, when the index i has not reached "4", the index i is incremented in step 36 and the process returns to step 34. .

Conversely, when the determination in step 36 is affirmative, that is, when the index i reaches "4", this routine is terminated. FIG. 4 is a flowchart of the motor driving routine executed in step 35 of the sheet cutting control routine. In step 350, the motor _ON time T _ON (i) and the motor driving unit switching duty ratio DR according to the internal temperature θ of the cutter unit 10. At least one of (i) is corrected.

When the internal temperature θ of the cutter unit 10 increases, the movable blade 101 and the fixed blade 102 made of metal expand and the frictional force between the movable blade 101 and the fixed blade 102 increases. This is because it is necessary to increase the current or extend the current supply time to the motor. That is, the ON time TON and the switching duty ratio DRON after the temperature correction are calculated by the following equation.

DRON ← f _D (θ, i) · DR (i) TON ← f _T (θ, i) · T _ON (i) where f _D (θ, i) and f _T (θ, i) are This is a function of the predetermined internal temperature θ of the cutter unit and the stage i.
Next, at step 351, at least one of the motor-on time TON after temperature correction and the motor drive unit switching duty ratio DRON is corrected according to the paper quality to be cut.
This is because when cutting thick paper or hard paper, the load on the movable blade increases, so it is necessary to increase the supply current to the motor or extend the supply current time to the motor. is there.

That is, the ON time T after the paper quality correction is calculated by the following equation.
Calculate ON and switching duty ratio DRON. DRON ← g _D (θ, i) DRON TON ← g _T (θ, i) TON Note that g _D (θ, i) and g _T (θ, i) are predetermined paper quality C and stage i. Function.

After resetting the motor time T in step 352, the corrected switching duty ratio DRON and current direction D _ON (i) are output in step 353.
When the switching duty ratio DRON is increased, the current flowing through the motor 107 increases, and when the duty ratio is reduced, the current flowing through the motor 107 decreases. or,
If the current direction D _ON (i) is at the “H” level, the motor 10
7, the current flows in the forward direction, and if the current is at the "L" level, the motor 107 flows in the reverse direction.

At step 354, stage index i
Is determined to be "3". Then, step 354
If an affirmative determination is made in step 355, the switch 10 is switched in step 355.
It is determined whether 8 has been turned off. If a negative determination is made, the process returns to step 353. Conversely, if the determination in step 355 is affirmative, this routine ends. Step 354
If a negative determination is made in step 356, it is determined in step 356 whether the current supply time T to the motor has exceeded the on-time TON. If a negative determination has been made, the flow returns to step 353. Conversely, if the determination in step 356 is affirmative, this routine ends.

FIG. 5 is a diagram for explaining the operation of the paper cutting apparatus according to the present invention. The operation mode of the movable blade, the motor current, the state of the switch, the value of the index i, the switching duty ratio DR (i) and the current Represents the direction D _ON (i). When a cutting command is output to the paper cutting device according to the present invention, the stage index i is set to "1". Then, the switching duty ratio DR (1) is set large, and the current direction D _ON (1) is set to the “H” level. Therefore,
A large current flows in the motor 107 in the normal rotation direction during the first ON time T.
_ON (1) flows, the motor starts rotating and the movable blade 102
Starts cutting the paper 100. Note that the first ON time T _ON (1) is set as a time during which the movable blade 102 reliably starts moving.

First ON time T_ON(1) Stay after lapse
The di-index i is changed to "2". Then switch
The switching duty ratio DR (2) is set to medium and the
Direction D _ON(2) is maintained at the "H" level. That is,
After the movable blade 102 starts moving, the motor 107
The movable blade 102 does not
The disconnection can be continued, and the power consumption can be reduced.

When driving at the switching duty ratio DR (2) continues for the second _ON time T _ON (2), the movable blade 1
02 ends the movement along the spiral shaft 104, and starts the backward movement guided by the groove of the spiral shaft 104. That is, the second ON time T _ON (2) is
02 is set to the time at which the end of the torsion and the start of the return are surely started.

Second ON time T_ON(2) Stay after lapse
The di-index i is changed to "3". Then switch
The switching duty ratio DR (3) is set to a small value,
Direction D _ON(3) is maintained at the "H" level. That is, return
Not only do you need to cut the paper,
To control the speed of the motor 103
The flow is further reduced and the power consumption is also reduced.

When the carriage 103 reaches the operation range of the switch 108, the switch 108 operates and the stage index i is changed to "4". Then, the switching duty ratio DR (4) becomes minute and the current direction D _ON (4)
Is set to the "L" level. That is, a small current flows in the reverse direction of the motor 107, and the brake is applied to the carriage 103 to surely stop the carriage 103 at the reference position.

After the lapse of the fourth _ON time T _ON (4), the current supply to the motor 107 is stopped. Note that the switch 10 for detecting that the carriage 108 is at the reference position.
As 8, a mechanical contact switch or a photoelectric switch can be used. Further, it is desirable that the paper quality setting unit 14 sets the paper quality by a jumper resistor and a dip switch on the printed circuit board.

Further, in the above embodiment, the roller type cutter has been described, but it is apparent that the present invention can be applied to a guillotine type cutter. Further, the motor may be a stepping motor instead of a DC motor.

[0031]

According to the paper cutting apparatus according to the first and second aspects of the present invention, the power is adjusted in at least three stages in accordance with the operation state of the paper cutting means, thereby reliably cutting the paper and bounding the paper cutting means. Prevention and reduction of power consumption can be achieved at the same time. According to the paper cutting apparatus of the third aspect, the driving time and the power are adjusted according to the ambient temperature of the cutting means, and reliable operation is guaranteed even when the temperature fluctuates.

According to the paper cutting device of the fourth invention,
The drive time and the power are adjusted according to the paper quality of the paper to be cut, and a reliable operation is guaranteed even when the paper quality is changed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a paper cutting device according to the present invention.

FIG. 2 is a functional diagram of the paper cutting device according to the present invention.

FIG. 3 is a flowchart of a sheet cutting control routine.

FIG. 4 is a flowchart of a motor drive routine.

FIG. 5 is an explanatory view of the operation of the sheet cutting device according to the present invention.

[Explanation of symbols]

 Reference Signs List 10 cutter unit 100 paper 101 fixed blade 102 movable blade 103 carriage 104 spiral shaft 105, 106 gear 107 motor 108 switch 11 control unit 110 bus 111 CPU 112 ROM 113 RAM 114 ... Cutter interface 115 ... Higher-level interface 12 ... Motor drive unit 13 ... Temperature detection unit 14 ... Paper quality setting unit 15 ... Power supply

Claims (8)

[Claims] 1. A paper cutting means, a driving means for driving the paper cutting means, and a supply power adjusting means for controlling power supplied to the driving means in at least three stages according to an operation state of the paper cutting means. Paper cutting device to be equipped. 2. The apparatus according to claim 1, further comprising: a reference position detection unit configured to detect that the sheet cutting unit is at a reference position, wherein the supply power adjustment unit sets a start power for a first predetermined time when the driving unit starts. After the drive unit is started, at least until the cutting of the sheet by the driving unit is completed, the cutting power is smaller than the starting electric power for a second predetermined time. For a third predetermined time during which it is detected that the paper cutting means has returned to the reference position, the return power is smaller than the cutting power, and the reference position detection means detects that the paper cutting means has returned to the reference position. And a supply power adjusting means for adjusting the starting power, the cutting power, and the returning power to a braking power in a direction opposite to the fourth predetermined time. 3. The apparatus according to claim 2, further comprising a temperature detecting unit configured to detect an ambient temperature of the sheet cutting unit, wherein the power supply adjusting unit controls the first predetermined time, the second predetermined time, and the fourth predetermined time. 3. The sheet according to claim 1, further comprising a temperature correction unit configured to correct at least one of the starting power, the cutting power, the return power, and the braking power according to an ambient temperature detected by the temperature detection unit. 4. Cutting device. 4. A paper quality setting means for setting the paper quality of the paper, wherein the power supply adjusting means is configured to control the first predetermined time, the second predetermined time, the fourth predetermined time, and the start-up. 4. The paper quality correction unit according to claim 1, further comprising a paper quality correction unit configured to correct at least one of the power, the cutting power, the return power, and the braking power according to the paper quality of the paper set by the paper paper quality setting unit. A paper cutting device according to claim 1. 5. The paper cutting apparatus according to claim 1, wherein said paper cutting means comprises: a rail-shaped fixed blade; and a movable blade running along said fixed blade. . 6. The paper cutting apparatus according to claim 1, wherein said paper cutting means is a guillotine cutter. 7. The sheet cutting device according to claim 1, wherein the driving unit is a DC motor. 8. The paper cutting apparatus according to claim 1, wherein said driving means is a stepping motor.