JP2002053253A - Web winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web winding device capable of consistently winding a web at a high speed without generating any breakage or wrinkles of the web, or any defective web winding. SOLUTION: This web winding device comprises a control means for rotating a winding roller at a speed slower than the regular winding speed for a predetermined period before the winding roller is rotated at the regular winding speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web winding device for winding a web output from a printing device into a roll.

[0002]

2. Description of the Related Art As one of motor control techniques in a web winding device, there is known a configuration in which a constant web winding speed is obtained by constant power output control of an AC motor. In this configuration, in order to take up the web in a roll shape so as to prevent displacement or wrinkles during winding, a constant tension is applied to the conveyed web in a direction opposite to the feed direction to the motor rotating shaft. The connected roller is rotated. Here, when the AC motor is rotated while applying a constant tension F to the web, if the output P of the AC motor is kept constant, the circumferential velocity v on the circumference of the roller is kept constant (∵
P = Tr.ω = F.v = constant value). AC motor output P
In order to keep the voltage constant, if the voltage V is constant, P = V
In i, feedback control is performed with a current taken from the shunt from i to obtain a constant power output.

Further, as another motor control technique, a configuration for obtaining a constant angular velocity by servo control is known. The servo control motor generally realizes a control that detects a rotational speed by a sensor and obtains a constant rotational angular speed by feedback control.

[0004] As another motor control technique, a motor control system using a stepping motor is known. The basic principle of a stepping motor is to obtain a rotational angular velocity proportional to a driving pulse frequency.

[0005]

By the way, in the case of the constant power control of the AC motor, as the winding speed increases, the rate of change of the rotational angular velocity at the start of winding increases, and near the instant of unwinding. A sudden tension is applied between the web and the roller, and the web comes off the take-up roller, making it difficult to unwind.
The angular acceleration at the time of unwinding increases as the radius of the winding roller decreases, and a sharp angular acceleration is applied.Since this angular acceleration is determined by the output power of the motor, the angular acceleration is reduced to a gradual acceleration, and the initial winding speed is increased slowly. Can not change the deceleration of the angular acceleration properly.

In a motor control system for obtaining a constant rotational angular velocity by servo control, in the application of a web winding device, the roller diameter changes with the winding of the web, and the circumferential speed of the web on the roller circumference changes with time. Therefore, at a constant motor rotation angular velocity, the web peripheral speed on the roller circumference does not match the web feed speed of the printing apparatus, and the web cannot be wound as it is.

Further, the stepping motor is not suitable for applications requiring a relatively large torque, such as web winding.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a web take-up apparatus which is less likely to cause breakage and wrinkles of the web and poor take-up, and can stably perform high-speed take-up of the web. It is in.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a web take-up device having a web take-up roller for taking up a web output from a printing device in a roll form. This is achieved by providing control means for rotating the take-up roller at a speed lower than the normal take-up speed for a certain period of time prior to rotation.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the overall configuration of the web winding device of the present invention. First, the configuration of the web winding device will be described. In FIG. 1, a web winding device 1
Are a web input unit 5, a web capture unit 8, a buffer unit 1
4. Tension generator 17, direction changer 22, web take-up unit 2
3 and a microcomputer control device 2.

The microcomputer control device 2 realizes a web winding function by program control, and includes a web input unit 5, a web loading unit 8, a buffer unit 14, and a tension generating unit 1.
The electrical control for the respective motor driving parts and sensor parts existing in the web 7 and the web take-up unit 23 is performed by a ROM.
4 is executed by the control program 3.

Control program 3 in microcomputer control device 2
Calculates the web take-up diameter at the web take-up roller unit 25 by performing low-speed initial take-up from a state in which the initial take-up diameter is unknown, and thereafter, the web following the web output speed of the printing apparatus. The take-up acceleration rotation of the rotation angle acceleration for achieving the take-up speed is performed, and thereafter, even if the take-up diameter gradually changes due to take-up, the circumferential speed on the take-up roller 25 circumference is automatically set.
(m / s) performs winding at a constant peripheral speed that matches the web output speed (m / s) of the printing apparatus. The control program 3 is stored in the ROM 4.

The web input unit 5 includes a web input buffer 6
And a buffer sensor 7. The web input buffer 6 prevents the output operation and the capture operation of the web input buffer 6 from being stopped as much as possible with respect to the speed difference between the speed of the web output from the printing apparatus and the capture speed when the web capture unit 8 captures the web. Then, a space capable of storing and storing the web is provided by changing the amount of deflection of the web within the web capacity range.

As shown in FIG. 1, a plurality of pairs of light-emitting lamps and light-receiving sensors are prepared as shown in FIG. 1 (three pairs in this example), and a light-receiving sensor determines how much web margin the web buffer 6 has. The judgment is made based on a plurality of level values in the on / off state of the light receiving sensor in the light shielding state or the light receiving state.

The web take-in unit 8 includes a web take-in roller 9,
Web take-in presser roller 10, Web take-up motor 11
And a rotary encoder 13, which takes in the web from the buffer 6 between the take-in roller 9 and the take-down press roller 10, rotates the motor 11, and guides the web between the rollers to the buffer 15 via the buffer 6.

The rotating shaft of the web taking-in roller 9 is connected to the rotating shaft of the web taking-in motor 11 via a speed reduction mechanism 12. The rotation of the web take-in motor 11 is controlled by the speed reduction mechanism 12.
The web take-in roller 9 is rotated via the. The web take-in press roller 10 applies pressure to the web take-in roller 9 across the web, and when the roller 9 rotates, it rotates passively due to frictional force, and can convey the web sandwiched between both rollers.

The rotating shaft of the web taking-in motor 11 is connected to the rotating shaft of the web taking-in roller 9 via a speed reduction mechanism 12, and when the motor 11 rotates, the rotation angular velocity is reduced by the speed reducing mechanism 12, and the web taking-in roller 9 is rotated. To rotate. The speed reduction mechanism 12 reduces the rotation of the web take-in motor 11 at a constant speed reduction ratio I 1, and transmits rotational power to the web take-up roller 9.

The rotating shaft of the rotary encoder 13 is connected to the rotating shaft of the web take-in press roller 10, and is used to calculate the web take-in speed.

The buffer unit 15 includes a buffer sensor 16. The buffer 15 performs both the web input operation from the web intake unit 8 and the web winding operation by the web winding unit 23. To minimize intermittent activity (browsing and stopping the web),
A space is provided to allow the web to bend and accumulate and store it by a fixed length so that both can operate continuously.

The output web buffer sensor 16 has the same mechanism as that of the buffer sensor 7, and a plurality of pairs of light emitting lamps and light receiving sensors are prepared as shown in the figure. Of the light receiving sensor or the on / off state of the light receiving state is determined by a plurality of level values.

The tension generating section 17 includes feed rollers 18, 1
9, the torque motor 20 and the rotary encoder 21 generate a web tension repelling the winding, and stretch the web to obtain an effect of winding the web without wrinkles. The feed roller 18 applies pressure to the feed roller 19 to pinch the web, and the feed rollers 18, 1
9 is passively rotated by the feeding of the web taken up by the frictional force between the web and the rollers.

The rotating shaft of the torque motor 20 is connected to the rotating shaft of the feed roller 21 to generate a repulsive tension in a direction opposite to the web feeding direction when the web is wound. The torque motor 20 itself does not generate an active rotational power, but generates a constant torque as a repulsive force when a rotating shaft is passively rotated by an external force when a constant DC voltage is applied. The generated torque is the web tension itself.

The rotary shaft of the rotary encoder 21 is connected to the rotary shaft of the feed roller 19, and generates a pulse signal according to the rotation of the feed roller 19. By measuring the pulse frequency, the peripheral speed on the winding roller circumference, that is, the web winding speed can be calculated and obtained.

The web direction changer 22 changes the direction in which the web is conveyed from the tension generating section 17 to the web winding section 23. The web take-up unit 23 includes a take-up motor 24, a take-up roller 25, a speed reduction mechanism 26, a rotary encoder 2
7, and the web is wound around a winding roller 25. The take-up motor 24 has a built-in motor controller that operates so as to reach the designated rotational angular velocity at the designated acceleration time when the rotational angular velocity and the designated acceleration time are given as parameters, and performs the designated rotation. Regarding the rotational angular velocity, the characteristic that the rotational speed is kept constant even when the output torque changes due to an external force is programmed in the motor controller.
The take-up roller 25 is connected to the rotation shaft of the take-up motor 24 via a speed reduction mechanism 26, and takes up the web around the circumference.

The reduction mechanism 26 includes a rotating shaft of the motor 24,
It is connected between the rotating shaft of the winding roller 25 and the reduction ratio I
2, the rotation speed of the winding motor 24 is reduced to 1 / I2 times, the motor allowable torque is amplified to I2 times, and the rotation power is transmitted to the winding roller 25.

The rotary encoder 27 is attached to the winding motor 24 and generates a pulse signal according to the rotation of the motor. By measuring the pulse frequency, the rotation angular velocity of the winding motor 24 can be calculated and obtained.

Operation panel 2 connected to control microcomputer 2
Reference numeral 8 displays a guidance message to the operator according to an instruction from the control microcomputer 2, and sends a key operation instruction from the operator to the control microcomputer 2. The power supply device 29 supplies power to the control microcomputer 2, the operation panel 28, and the motor driver circuit / sensor detection circuit 31. Reference numeral 30 denotes a CPU in the control microcomputer 2, and reference numeral 31 denotes a motor driver circuit / sensor detection circuit, which constitutes an actuator (various motor) drive circuit and a sensor detection circuit in the web winding device 1 belonging to the control microcomputer 2. , And operate under program control from the CPU. Reference numeral 32 denotes a connection cable to various motors and sensors, and a motor driver circuit / sensor detection circuit 31
And electric wires connecting the actuators (various types of motors) in the web winding device 1 and the sensor groups. Reference numeral 33 denotes a power supply cable, a wire for supplying power from the power supply device 29 to the control microcomputer 2, the operation panel 28, the motor driver circuit / sensor detection circuit 31, and a cable 34 to a commercial power supply. A power supply 29 and a commercial power supply (A
C100V, 200V, etc.). Reference numeral 35 denotes a printing device.

Next, the overall operation of the web winding device of the present invention will be described. (Taking-up preparation operation) Before taking up the web, the operator prepares to take up the web. That is, a page feed operation is performed on the printing apparatus side, and a web of a necessary length until reaching the winding roller 25 is drawn out. The web take-up device 1 is ready for take-up after the power is turned on (READY
Until the state), the printing apparatus 35 side indicates an unwindable state by an interface signal (not shown).
The web is in a state where it cannot be sent from the printing device because it has notified the NOT READY state. The operator
The web is input to the web buffer 6, the web intake unit 8, the output web buffer 15, the tension generating unit 17, the direction change unit 22
Is passed manually, and the leading end of the web is stopped at the web stopper of the winding roller 25.

After the web setting operation, when the operator presses the READY key on the operation panel 28, the web take-up device 1 changes the READY state meaning a take-up ready state to the printing device 35.
This is notified to the printing apparatus by an interface signal, and the printing apparatus 35 can output the web. (Web capturing operation) At the moment when the operator presses the READY key, the state of the web sensor of the input web buffer 7 is (C1, C2, C3) = (OFF, ON, ON) and the sensor of the output web buffer 16 is The state is (D1, D2, D3) = (OFF, ON, ON). Here, the sensor is turned off when light from the light-emitting lamp is blocked, turned on when receiving light, and when a web exists at the sensor height, the sensor is blocked and turned off, and there is no web at the sensor height. In this case, the sensor receives light and turns on.

The web capture unit 8 calculates (C1, C2, C3) = (OFF, ON,
In the case of (ON) or (ON, ON, ON), it is considered that a sufficient amount of web is not output from the printing apparatus to be taken into the input web buffer, and the taking motor 11 is in a state where it does not start rotating. On the other hand, under the condition that the state of the output web buffer sensor 16 is (D1, D2, D3) = (OFF, ON, ON), the web take-up unit 23 stores sufficient web to perform winding in the output web buffer. And the winding motor 24 does not start rotating.

When the printing device 25 starts outputting the web, the web of the input web buffer unit 6 is lowered in a U-shape by the weight of the web. When the state of the buffer sensor 7 becomes (C1, C2, C3) = (OFF, OFF, ON), the motor 11 operates at a speed slightly lower than the web output speed of the printing device 25 (for example, in the printing device). At 80% of web speed).

As for the conditions of the web input and the web capture, the feed speed of the printing device 25 is 20% faster than the web capture speed. Is (C1, C2, C3) =
(OFF, OFF, OFF).

After this condition is satisfied, the take-in motor 11 rotates at a web feed speed slightly higher than the printing device 25 (for example, a speed of 101% of the web speed in the printing device), and the state of the web sensor 7 of the web buffer 6 is changed. Is (C
As long as the condition of (1, C2, C3) = (OFF, OFF, OFF) (the state in which the web is leaning to the bottom) is satisfied, the capture at the printing apparatus 25 and the current web feed speed is continued. Here, the state of the web sensor 7 of the input web buffer 6 is (C1, C2, C3) = (OF) because the printing device 25 has temporarily stopped the print output.
F, OFF, ON) (the bottom web sensor is ON)
The capture speed is set slightly lower than the web feed speed of the printing device 25 (here, 80%), and capture is continued. If the printing device 25 is still stopping printing,
The state of the web sensor 7 of the input web buffer 6 is (C1, C
2, C3) = (OFF, ON, ON)
N), and upon detection of this state, the take-in motor 11 is stopped, and the system waits until web feeding of the printing apparatus 25 is resumed.

In this way, the web take-in section 8 determines the taking-in to the web buffer 6 and the web buffer 15 by the state (C1, C2, C3) of the web sensor 7 of the web buffer 6, and controls the web taking-in speed. I do. In a time interval in which the web output of the printing apparatus is continuous, the input buffer 6
The position of the web sensor in the input web buffer 6 is (C1, C2, C3) = (OFF, OFF, ON) and (C1, C2, C3) = (O
FF, OFF, OFF) and go up and down between them to stabilize. (Web Winding Operation) Next, the operation of the web winding section will be described. As shown in FIG. 2, the motor rotation angular velocity of the web take-up unit is changed from the motor stopped state (initial state) to (P
AHSE I) low speed winding phase, (PHASE II) acceleration winding phase, (PHASE III) constant peripheral speed phase, (PHASE IV) stop phase. The winding operation of each phase in FIG. 2 will be described. (Initial state) Web sensor 1 of output web buffer 15
(D1, D2, D3) = (OFF, ON, ON) when READY key is pressed in the state of No. 6
Or assume (ON, ON, ON). In this case, it is determined that there is not enough web in the output web buffer 15 to start winding, and the winding motor 24 does not start rotating. (Low-speed winding phase) As the output of the printer device continues and the web is taken in, the web sensor 16 of the output buffer 15 changes to (D1, D2, D3) = (OFF, OFF, OFF). Reaches a position near the bottom of the output buffer 15 in a U-shape, and the winding motor 24 winds the winding roller 25 around the winding roller 25 at a sufficiently low rotation angular velocity so that the web end does not come off the winding roller 25. To take. In the time section of about 10 rotations, the web feed speed Va is calculated from the read value of the encoder 21, the rotation speed ωa of the winding motor 24 is calculated from the value of the encoder 27, and the roller radius is calculated from these measured values. Find r. The calculation procedure of the roller radius r is as follows.

Ωa = 2π · f1 / N1 (rad / s) Equation 1 ωb = 2π · f2 / N2 (rad / s) Equation 2 Va = Rout · ωb Here, ωb in Equation 2 is substituted, and Va = 2π · Rout · f2 / N2 (m / s) Equation 3 r = Va / (ωa / I2) Here, ωa in Equation 1 and Va in Equation 3 are substituted, and r = I2 · Rout · f2 · N1 / ( f1 · N2) (m) Equation 4 (Acceleration Winding Phase) Since the roller radius has been determined, the peripheral speed of the winding roller 25 is then set to the target peripheral speed = acceleration time T.
A target rotation angular velocity ω ₁ of the winding roller 25 for accelerating to V0 (= web feed speed in the printing apparatus) is calculated.

Incidentally, the calculation method of ω ₁ (rad / s) (the calculation method of the target initial angular velocity in the angular velocity acceleration phase of the winding roller)
Is as follows. (1) Specifications of the take-up motor 24 to be used The variable speed of the take-up motor 24 to be used is specified as acceleration time /
By setting two parameters, deceleration time and rotation angular velocity,
It is designed to reach the specified rotational angular velocity at the specified acceleration time / deceleration time. In accordance with the motor specifications, in the acceleration winding phase, it is necessary to set two parameters of the acceleration time (deceleration time) and the rotational angular velocity. Here, the angular velocity ω ₁ is the initial angular velocity of the winding roller 25 in a constant peripheral speed phase for controlling the web feed speed of the printing apparatus to be constant. (2) the target Calculation slow winding phase of the winding roller angular velocity omega ₁ of starts rotation angular velocity of the winding roller 25 in omega ₀ is slow, the feed roller 18 (radius D / 2 = 5
(0 mm) is to be sent for a length of 10 rotations.
At this time, since the roller paper is wound around the winding roller 25 (initial radius R ₀ = 53 mm), the winding number Nz of the winding roller is:
Nz (times) ≒ 10πD / 2πR ₀ = 5D / R ₀ = 5 × 100
/53=9.43 (times) (Equation (1)).

In the accelerated winding phase, the rotational angular velocity is actually
The degree control has an 8-character characteristic, but the angular velocity is ω₀→ ω₁of
Approximate by equiangular acceleration motion. This equiangular acceleration motion
To the angular acceleration α (rad / s^Two), Acceleration time T₁(s) then ω₁= Ω₀+ ΑT₁… Equation (2) Therefore, α = (ω₁−ω₀) / T₁(rad / s^Two) ... Equation (3) The rotation speed Nx (times) of the take-up roller in the accelerated take-up phase.
Nx = (ω₁+ Ω₀) T₁/4π...Equation (4) angular velocity ω₁The radius of the take-up roller at₁, Web thickness d
Then r₁= R₀+ D (Nx + Nz), where equation (1)
Substituting equation (4) gives r₁= R₀+ D ((ω₁+ Ω₀) T ₁/ 4π
+ Nz) and ω₁Ω ω on both sides from 0₁Multiply by r₁ω₁
= R₀ω₁+ D ((ω ₁+ Ω₀) T₁/ 4π + Nz) ω₁,here
Assuming that the web feed speed of the printing apparatus is V0, V0 =
r₁ω₁Holds, V0 = R₀ω₁+ D ((ω₁+ Ω₀)
T₁/ 4π + Nz) ω₁, 4πV0 =
4πR₀ω₁+ D ((ω₁+ Ω₀) T₁+ 4πNz) ω₁Represented by
You. This equation is further organized into a quadratic equation for ω and written.
DT₁ω₁ ^Two+ (4πR₀+ D (T₁ω₀+ 4πNz)) ω₁-4πV0 = 0 Equation (5) Equation (5) is obtained from the formula of the solution of the quadratic equation to the solution ω₁Is the count a,
b and c are a≡dT₁, B≡4πR₀+ D (T₁ω₀+ 4πN
z), c≡-4πV0, ω₁> 0 from ω₁Is simply
One solution, ω₁= (-B + √ (b^Two-4ac)) / 2a
(Equation (6)) is obtained. In the actual calculation, the defined a, b, c
The solution is calculated by calculating the count of
It is an easier way to calculate.

The winding motor 24 is connected to the winding roller 25 via a speed reduction mechanism 26 (reduction ratio I2).
Rotational angular velocity initial speed of the take-up motor 24 in acceleration winding phase, the I2 · ω _1. (Acceleration operation) obtained I2 · omega ₁ and (rad / s), the addition acceleration specified time T ₁ (s) is in the take-up motor 24 as a parameter, the motor starts accelerating, the target rotation angular velocity after T ₁ reached I2 · ω _1, at the same time the angular velocity of the winding roller 25 reaches omega _1, the winding circumferential speed at this time corresponds to the web feeding speed V0 of the printing apparatus. After that, it enters the constant peripheral speed phase. (Constant peripheral speed phase) In this phase, a constant time T
Read the encoder 2 in intervals, that value from the current time of the winding roller radius r (calculated value by measurement) determined, then expect calculate roller radius r _n after T elapses from the present,
The process of calculating the rotation angular speed of the winding motor from the condition of keeping the peripheral speed of the winding roller at that time at the web feed speed V0 of the printing apparatus, starting the rotation, and waiting for the elapse of T time is repeated until the roller winding amount is full. .

It should be noted that the method of obtaining the winding roller radius r (measured value by measurement) at the current time is as follows. The current peripheral speed of the winding roller is determined at the moment when the acceleration in the accelerated winding phase is completed. Assume that at time, it matches the web feed speed V0 of the printing device. The pulse frequency f2 generated by the rotary encoder 2 attached to the web feed roller which rotates at the same peripheral speed as the web feed speed in close contact with the web
(Hz), the rotational angular velocity ωb of the feed roller is calculated from the above equation. That is, when the rotary encoder 2 outputs N2 (number) pulses in one round, ωb = 2πf2 / N
2 (rad / s).

Similarly to the above, the rotational angular velocity ωa of the winding motor is calculated from the pulse frequency f1 generated by the rotary encoder 3.
Ask for. That is, when the rotary encoder 2 outputs N1 (number) pulses in one round, ωa = 2πf1 /
N1 (rad / s).

The actual winding speed Vc of the web winding is the peripheral speed (m / s) when the winding roller (radius Route (m)) rotates at the rotational angular speed ωb (rad / s). Vc = Rout · ω
b = Rout · 2πf2 / N2 (rad / s) is obtained. The actual feed speed Vc of the web winding is set to be equal to the circumferential speed of the winding roller, and the web roller radius r of the winding roller moving at a constant speed at ωa is given by: Vc = r (ωa / I2) r = Vc / (ωa / I2) = (Rout · 2πf2 / N
2) / (2πf1 / (N1 · I2)) = I2 · Rout · f2 ·
N1 / (f1 · N2) is obtained. (For prediction calculator of the winding roller angular velocity after T has elapsed from the moment of the roller radius r) accelerating winding phase Motomari the target take-up roller angular velocity omega _1, the immediately after the acceleration of the take-up motor angular velocity I2 · omega ₁ is completed The roller radius r immediately after the end of acceleration was determined. Here, take the acceleration end time at a constant circumferential speed phase time origin of t = 0, obtaining the expected calculated value of the winding roller angular velocity omega _n after specified time T has elapsed since t = 0.

It is assumed that the time T has elapsed from the time t = 0, and that the winding roller has rotated n times at this time. The angular velocity at time t = 0 is ω ₁ = V0 / r, the roller radius is r from t = 0 until immediately before the winding roller makes one rotation, and the roller radius becomes r + d at the moment of one rotation. Sunawachi time t = 0 from the angular velocity V0 / r is considered by a time t ₁ that the winding roller is rotated 1 angular velocity V0 / r is kept constant. Therefore
(V0 / r) · t ₁ = 2π (= one rotation) is established. Therefore t ₁
= 2πr / V0.

The angular velocity of the second rotation of the winding roller is such that the radius of the winding roller increases by d (m) for one web from time t = t _1, so that the angular velocity is V0 / (r + d). angular velocity by the time t ₂ when the winding roller is rotated 1 is considered that in one rotation remains constant. Therefore, (V0 / r + d) · t ₂ = 2π
(= One rotation) is established. Therefore, t ₂ = 2π (r + d) / V0.

Similarly, considering the ith rotation of the winding roller (i =
1, 2, 3, ... angular velocity of n), the web 1 from the time t = t _i
Since the radius of the d-roller increases by the number of sheets, the angular velocity becomes V0 / (r +
In id), it is considered that the angular velocity is kept constant only for the time t _i during which the winding roller makes one rotation, and one rotation is made. Therefore V0 /
(r + id) t _i = 2π (= one rotation) holds. Therefore t _i =
2π (r + id) / V0.

To summarize the above, the time T required for the winding roller to make n rotations starts at time t = 0 (where time t = 0 is the start time of the acceleration phase), and T = (π / π / π) V0)
(2rn + dn ² + dn) = (π / V0) (dn ² + (2r +
d) n), therefore πdn ² + π (2r + d) n−T · V0 =
It becomes 0. The solution n of this equation becomes a single solution from n> 0,
When coefficients a = πd, b = π (2r + d), and c = −T · V0 are set, n = (− b + √ (b ² -4ac)) / 2a. By substituting a, b, and c into the above equation, from time t = 0 to T
The winding roller rotation speed n after time is obtained, and this time t = T
In so web is wound by n times r, winding roller radius becomes = r _n (r + nd), and the angular velocity omega _n in the winding roller radius _{ω n = V0 / (r +} nd). (Estimation calculation of the angular velocity of the winding motor after a lapse of T from the moment of the roller radius r) From the reduction ratio I2, the angular velocity ωx of the winding motor is ωx = I2
Ω _n = I2 · V0 / (r + nd) can be expectedly calculated. Thus, the expected rotational angular velocity of the winding motor is obtained. (Change of speed of winding motor rotation speed by expected calculation (deceleration)) Estimated rotation angular speed ωx (rad / s) of winding motor after T has elapsed
Then, the designated acceleration time T is given to the parameters of the winding motor to change the speed. Next, after elapse of the time T (s), the process returns to the first step of the constant peripheral speed phase. In this manner, the winding roller peripheral speed is changed at intervals of T (s) until the web winding is completed, and the roller web winding at an approximately constant peripheral speed V0 (m / s) is performed. (Stop Phase) When the roller rotation reaches the maximum winding diameter, the roller full sensor is turned on. When this is detected, the winding motor 24 and the take-in motor 11 are turned off, and the printing apparatus 3 is turned off.
For No. 5, NOT READY is transmitted via the interface signal line, and the output from the printing apparatus is stopped.

[0046]

As described above, according to the present invention, web breakage and wrinkles are hardly generated, and poor winding is less likely to occur, and stable high-speed web winding can be performed. An apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of the present invention.

FIG. 2 is an explanatory diagram showing a temporal speed change of a winding roller of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Web take-up apparatus, 2 ... Microcomputer control apparatus, 5 ... Web input part, 8 ... Web take-in part, 14 ... Output web buffer part, 17 ... Tension generation part, 22 ... Direction changer, 23 ... Web take-up Part, 28 ... operation panel, 29 ... power supply unit, 31
... Motor driver circuit / sensor detection circuit, 35 ... Printing device.

Claims (2)

[Claims] 1. A web take-up device comprising a web take-up roller for taking up a web output from a printing device in a roll form, wherein the web take-up roller is rotated at a normal take-up speed for a predetermined period of time. A web winding device comprising a control unit for rotating the winding roller at a speed lower than the normal winding speed. 2. The control device according to claim 1, wherein the control unit includes a calculating unit that calculates an initial radius including a web wound on the winding roller during a low-speed rotation period of the winding roller. The web take-up device as described in the above.