JPH0688703B2 - Accelerator for speed difference absorption of sheet material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention provides a temporary processing speed between a pre-process and a post-process of a line on which a sheet material such as a synthetic resin film, a metal foil or a cloth runs. The present invention relates to a sheet-shaped material speed difference absorption accumulator which absorbs the speed difference and enables stable traveling of the sheet-shaped material when such a difference occurs, and particularly relates to a drive device for the accumulator.

(Prior Art) In a line in which the above-mentioned sheet-like material (hereinafter, simply referred to as a sheet) continuously runs, an accumulator for temporarily absorbing the speed difference is generally used when a processing speed difference occurs between the front and rear devices. Has been done.

This kind of accumulator operates so that when the post-process is decelerated or stopped, the sheet is stored together with the start of the storage of the sheet, and when the post-process is chasing operation, the withdrawal of the stored sheet is started together with the withdrawal. However, conventionally, during such an operation, the sheet tension in the accumulator is significantly different from the steady tension due to changes in the inertia and mechanical loss of the rotating part and moving part (guide rollers and movable machine frame) that make up the device. There was a changing problem.

In order to minimize this tension fluctuation, the applicant of the present invention has previously described Japanese Patent Publication No. 58-46424, Japanese Patent Publication No. 62-25581, Japanese Patent Publication No. 62-25582, and Japanese Patent Publication No. 63-63456.
As proposed in Japanese Examined Patent Publication No. 60-157443, it is possible to positively drive the movement of the movable frame for sheet storage at a speed adapted to the processing speed difference between the front and rear devices, or to actively drive such a movable frame. In addition, not only in the steady state, but also during operation of the accumulator, positively drive some or all of the guide rollers in the device by the differential gear mechanism or endless belt tension at each speed that matches the speed difference. Provides a speed difference absorption accumulator in which fluctuations in sheet tension during operation of the accumulator are minimized.

(Problems to be solved by the invention) However, in the process of processing a sheet-like material, the line speed has recently become higher and faster, and with this speeding up, the required storage amount of the sheet becomes longer, and the number of guide rollers in the accumulator is increased. It has increased. Further, the sheet to be processed becomes thinner, and low tension and low tension fluctuation are required. The conventional differential gear drive system cannot cope with such a demand because the device becomes large and complicated. or,
In the case of the endless belt drive system, the tension fluctuation of the sheet becomes excessive due to the transmission delay due to the belt elongation during the transition period, which causes the problem of wrinkling and width fluctuation.

In view of such an actual situation, the present invention drives each guide roller in the accumulator independently by a small speed variable motor in order to advantageously cope with an increase in the number of guide rollers and increases the appropriateness of each guide roller. An object of the present invention is to solve the above-mentioned problem by calculating the number of rotations from the speed difference between the front and rear devices and using the calculated value as the speed command for each speed variable motor.

(Means for Solving the Problems) That is, according to the present invention, which is adapted to the above-mentioned object, a plurality of fixed-side guide roller groups provided in a machine frame and an elevator frame capable of moving up and down with respect to the machine frame are provided. A plurality of elevating-side guide roller groups are provided, and the sheet-like material sent from the previous step is sequentially passed through the inlet-side guide rollers located closest to the front-step side of the fixed-side guide roller group, and the elevating side It is stretched around the guide roller and each fixed side guide roller, and is fed to the subsequent step through the outlet side guide roller located on the most rear side of the fixed side guide roller group, and a speed difference occurs between the front and rear steps. At this time, in the speed difference absorbing accumulator for sheet-like material that absorbs the speed difference between the front and rear processes by moving the guide roller group up and down, A small speed variable motor is provided, and a motor provided with the guide roller of the inlet side of the small speed variable motor is provided with a motor provided with the guide roller of the outlet side so that the peripheral speed of the guide roller is the same as in the previous step. Are controlled so that the peripheral speed of the guide rollers is a speed corresponding to the speed change in the subsequent process, and the speed difference between the inlet side guide roller and the outlet side guide roller is calculated by the calculating means to obtain the total number of the elevating side guide rollers. A value obtained by dividing by 2 is calculated, and the calculated value is used as a tolerance so that the peripheral speed of each guide roller varies from the peripheral speed of the inlet side guide roller to the peripheral speed of the outlet side guide roller in an arithmetic progression. The basic feature is to control each motor provided on each guide roller other than the inlet side and outlet side guide rollers.

In this case, a calculation value obtained by dividing the speed difference between the inlet side guide roller and the outlet side guide roller by the calculation means by twice the total number of the lifting side guide rollers is set as the lifting speed of the elevator frame, and the calculation is performed. When the value is positive, the elevator frame is positively driven in the sheet-like object storage direction, while when the calculated value is negative, the elevator frame is actively driven in the sheet-like object feeding direction.

Further, in such an accumulator, a small speed variable motor provided on the outlet side guide roller is used at a predetermined acceleration / deceleration gradient or at a predetermined acceleration / deceleration change rate to a set speed at the time of stopping the post-process and re-driving the post-process. It is also a feature of the present invention that an acceleration / deceleration gradient setting device for decelerating or accelerating is provided.

(Operation) In the accumulator of the present invention configured as described above, each guide roller is rotationally driven by each small speed variable motor, and when there is a speed difference between the front and rear steps, the rotation is performed from the inlet side guide roller. Each guide roller is controlled so as to change in an arithmetic series toward the outlet side guide roller.

Therefore, the tension applied to the sheet stretched around each guide roller is extremely small and has little fluctuation even when the accumulator is operating.

Further, in this case, the calculated value obtained by dividing the speed difference between the inlet side guide roller and the outlet side guide roller by twice the total number of the elevating side guide rollers is set as the elevating speed of the elevator frame. By positively driving the frame, it is possible to prevent changes in the tension of the seat due to the lifting motion of the elevator frame,
The action of each of the small speed variable motors described above becomes more effective.

Further, according to the present invention, by providing an acceleration / deceleration gradient setting device for a small speed variable motor attached to the outlet side guide roller,
Smooth progress of each rotating part and moving part of the accumulator can be obtained when the subsequent process is stopped or restarted.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of the speed difference absorption accumulator of the sheet-like material of the present invention, and particularly shows the case where there are four lifting guide rollers in the accumulator.

In the figure, the sheet (S) is sent out from the previous step (1) (represented by a pinch roller device).

This sheet (S) is a first roller composed of a dancer roller (3) and a position sensor (4) for detecting the position of the dancer roller (3).
It is introduced into the accumulator through the dancer roller device (2) and the guide roller groups (R ₀ ), (R ₁ ) ...
It is stretched in a hairpin shape on (R ₈ ) and pulled out by a pinch roller device (5) on the accumulator outlet side.

Here, in the guide roller group, an even number (R ₀ ),
(R ₂ ), (R ₄ ) ... (R ₈ ) are fixed side guide rollers, which are rotatably supported by the accumulator main machine frame (not shown), while odd number (R ₁ ), ( R ₃ ) ...
(R ₇ ) is a guide roller for lifting and lowering, and a lifting frame (6) that moves up and down along the guide rail of the main frame, not shown.
It is rotatably supported by. Further, the sheet (S) sent out from the accumulator outlet pinch roller device (5) passes through the second dancer roller device (7) on the accumulator outlet side and is taken by the post-process (8) (represented by a pinch roller device). It is like this.

Reference numeral (10) is a yansa for detecting the position of the dancer roller (9) of the second dancer roller device (7).

Since the structures of the first and second dancer roller devices (2) and (7) and the pinch roller device (5) in the above description are known, detailed description thereof will be omitted.

Next, in the figure, (LTG) is the sheet speed detector in the previous step (1), (m ₀ ), (m ₁ ), (m ₂ ) ... (m ₇ ) are the guide rollers (R ₀ ), (R ₁ ), (R ₂ ) ... (R ₇ ) drive motor,
(C ₀ ), (C ₁ ), (C ₂ ) ... (C ₇ ) are controllers of the drive motors (m ₀ ), (m ₁ ) ... (m ₇ ).

(Mb) is the guide roller group (R ₀ ), (R ₁ ) ... (R ₈ ).
Among them, the drive motor for driving both the outlet side guide roller (R ₈ ) located closest to the outlet side of the accumulator and the outlet side pinch roller (5), (TGb) is the motor (M
b) Speed detector, (Cb) is the controller of the motor (Mb), and (C ₈ ) is equivalent to the diameter ratio of the outlet side pinch roller (5) and the outlet side guide roller (R ₈ ). It is a mechanical power transmission device having a transmission ratio.

On the other hand, (Ma) is a motor for driving an elevating device (not shown) of the elevating frame (6), and (Ca) is a controller of the motor (Ma).

(Mw) is a drive motor for the subsequent step (8), and (Cw) is a controller for the motor (Mw).

(11) is a ratio controller when the post-process (8) is synchronized with the previous process (1), and (12) is when the post-process (8) is chased at a faster speed than the previous process (1). The ratio controllers (11) and (12) are
It is selected and used by switches (S ₁ ) and (S ₂ ).

(13) is an acceleration / deceleration slope setting device, and (14) is a calculator (1
5), (16) ... (21) are 1/8, 2/8 ... of each input signal
It is a ratio controller that outputs the value of 7/8.

The accumulator of the present invention thus has a drive motor (m ₁ ) for each guide roller (R ₀ ), (R ₁ ) ... (R ₇ ),
(M ₂ ) ... (m ₇ ) and its controller (C ₀ ), (C ₁ ) ...
(C ₇ ) and ratio controllers (15), (16), ... (21) are provided, and their operation will be explained next. Normally, during operation, the speed is synchronized with the speed V _{0 of the} previous process. Then all the guide rollers (R ₀ ), (R ₁ ) in the accumulator…
(R ₈ ), the exit pinch roller (5) and the post-process (8) are driven by known tuning control.

More specifically, the output of the speed detector (LTG) in the previous process is used as the speed command signal, and the switches (S ₁ ) and (S ₃ ) are closed to detect the position detection sensor (4) of the first dancer roller (3).
By feeding back the output of the guide roller drive motors (m ₀ ), (m ₁ ), (m ₂ ) ... (m ₇ ) and the outlet pinch roller drive motor (Mb) in the accumulator, the pre-process speed V _o
The drive motor (Mw) in the latter step (8) also uses the output of the speed detector (LTG) as a speed command signal to control the position detection sensor (1) of the dancer roller (9).
The output signal of 0) is fed back, and the motor (Mw) is controlled so as to be synchronized with the pre-process speed V _o .

When there is a speed difference between the front and rear steps of the accumulator, assuming that the speed of the outlet side pinch roller (5) of the accumulator is V, the speed difference becomes ΔV = V ₀ −V, and at this time, the front and rear steps have excess and deficiency. Speed of the elevator frame (6) of the accumulator so that the sheet (S) is stored without being stored, or the stored sheet (S) is delivered to the next process without excess or deficiency.
Va is ΔV / 8, which is a value obtained by dividing the speed difference ΔV by twice the number of guide rollers on the elevation side (see JP-B-58-46424).

Here, when the value of ΔV is positive, it is the direction in which the sheet (S) is stored, that is, when the elevator frame (6) moves to the rising side in the embodiment, and when ΔV is negative, it is stored. The direction in which the sheet (S) is fed out, that is, in the embodiment,
This is a case where the elevator frame (6) moves in the descending direction.

On the other hand, when the elevator frame (6) is moving as described above, the moving speed of the machine frame (6) acts in a summing or differential manner on the peripheral speed of each guide roller in the accumulator. That is,
The inlet side guide roller (R ₀ ) of the accumulator is the same speed as the previous process speed V ₀ , but the outlet side guide roller (R ₈ ) is the drive speed V of the motor (Mb) and each guide roller ( The peripheral speed of R ₁ ), (R ₂ ) ... (R ₇ ) is ΔV / 8
Is set as a tolerance, and each time one guide roller passes, V ₀ changes to V from the inlet side guide roller (R ₀ ) toward the outlet side guide roller (R ₈ ) in an arithmetic series.

FIG. 2 is a diagram showing a specific mode of the above speed change.

Here, in Fig. 2, the post-process of the accumulator is temporarily stopped,
This is the case where after the required processing, the post-process is re-driven.
During this period, the accumulator stores the sheet (S) delivered by the previous process in the accumulator, and after the re-driving of the subsequent process, delivers the sheet (S) stored by the chasing operation. The peripheral speed of each guide roller or the ascending / descending speed of the elevator frame during this period is shown over time.

First, in the figure, from T ₀ to T ₁ is in normal operation, so that the guide rollers in the accumulator are all driven at the same speed as the previous process speed V ₀ .

Then, at T _1, when a stop signal is sent from the subsequent process as appropriate, the switch (S ₁ ) is opened, and the motor (Mb) is driven by the acceleration / deceleration gradient setter (13) according to the preset deceleration gradient. It slows down and stops at T ₂ .

Therefore, the speed of the guide roller (R ₈ ) changes from A to B ₈ (V ₀ to 0) from T ₁ to T ₂ .

During this period, the difference ΔV between the speed of the guide roller (R ₈ ) and the speed of the previous process is the speed detector (LTG) and the speed detector (TG
It is detected by the matching of b), and the detected value is calculated by the arithmetic unit (1
4) is input and ΔV / 8 is calculated and output.

This calculated value ΔV / 8 is used for the ascending / descending speed of the elevator frame (6) and the rotation speed of the guide rollers (R ₁ ) ... (R ₇ ). First, regarding the elevator frame (6), the switch (S ₁ ) Simultaneously with the opening of the switch, the switch (S ₃ ) is opened and the switch (S ₄ ) is closed.
The speed difference signal ΔV / 8 is used as a speed command signal, and the output signal of the position detection sensor (4) of the dancer roller (3) is fed back to the accumulator ascending / descending speed control side so that the speed difference between the front and rear steps is generated by the ascending / descending motor (Ma). The elevator frame (6) is lifted at a speed that matches the above, that is, the speed of A '→ B' shown at the bottom of FIG.

On the other hand, with respect to the guide rollers (R ₁ ), (R ₂ ) ... (R ₇ ), the speed difference signal ΔV / 8 corresponds to each guide roller (R ₁ ),
(R ₂ ) ... (R ₇ ) drive motors (m ₁ ), (m ₂ ) ... (m ₇ ) Input to ratio controllers (15), (16) ... (21) in the control circuit attached to Is calculated and output so that the ratio matches each roller, and this output value is matched with the previous process speed signal V _0, and sequentially for each guide roller (R ₁ ), (R ₂ ) ... (R ₇ ). Further, these calculated values are input to the respective guide roller drive motors (m ₁ ), (m ₂ ) ... (m ₇ ) as their speed signals and controlled so that each guide roller is driven at each speed. There is.

Next, in the figure, during the period from T ₂ to T ₃ , the motor (Mb) is still stopped, so at the point T ₃ the speed is detected until the restart signal is transmitted from the subsequent process. Vessel (TG
Since the value of b) is 0, the speed difference between the front and rear processes, ΔV = V ₀ , and the speed signal of the accumulator lift drive motor (Ma)
V _0/8 continues to lift frame (6) rises next the speed, and the guide rollers _{(R 1), (R 2} ) ... (R 7) , respectively It is driven at a constant speed.

Next, at T _3, when the restart signal is issued from the subsequent process, at the same time when the switch (S ₁ ) is opened and the switch (S ₂ ) is closed, the motor (Mb) is started and the acceleration / deceleration gradient setter (13) It accelerates as set in and reaches the pre-process speed V ₀ at T ₄ . And during this period from T ₃ to T ₄ , the speed of each guide roller (R ₁ ), (R ₂ ) ... (R ₇ ) is the same as the speed of decelerating and stopping the motor (Mb), It is driven at each speed that matches the difference. Note that FIG. 2 shows the speeds at this time as C ₈ → D, C ₇ → D ... C ₁ → D.

Furthermore, the motor (Mb) is switched (S ₂ ) even at T ₄
The speed signal is switched to the speed (1 + α) V ₀ set by the ratio controller (12), so the motor (Mb) is set to the set speed (1 + α).
Accelerate further to V ₀ .

Therefore, in the figure, the period from T ₄ to T ₅ enters the chasing operation region, and each guide roller (R ₀ ) ... (R ₈ ) is shown in FIG. 2 at each speed matching the speed difference between the front and rear processes. (D →
It is driven according to E ₈ ), (D → E ₇ ) ... (D → E ₁ ).

On the other hand, in the elevator frame (6), after the motor (Mb) is restarted at the time point T ₃ , the speed difference ΔV between the front and rear steps decreases, so the ascending speed ΔV / 8 decreases, that is, Then, the ascending speed of the elevator frame (6) decreases and ΔV = 0 at the time of T ₄ when the speed of the motor (Mb) reaches the previous process speed V ₀ . And as mentioned above, the motor (Mb) further accelerates to (1 + α) V ₀ even after passing the T ₄ point.
The sign of the speed difference ΔV = (V ₀ −V) changes from positive to negative between T ₄ and T ₅ .

Therefore, the elevator frame (6) stops at the T ₄ point and continues to reverse in the descending direction.

Then, as described above, after the guide rollers (R ₀ ) ... (R ₈ ) are respectively driven and the elevator frame (6) continues to descend, T _{5 in the} figure
At the time of, the motor (Mb) follows the chasing speed (1+
α) Reach V ₀ .

Each of the guide rollers (R ₀ ) ... (R ₈ ) is driven at the chasing speed as shown in FIG. 2 after this T ₅ point, and the elevator frame (6) after this T ₅ point as shown. Continues to descend at a constant speed and returns to the old position at point T ₆ . Then, the switch (S ₁₎ by an appropriate place return signal at this time closed, by open switch (S _2), the motor (Mb) is switched to the tuning control circuit of a pre-process speed, the switch (S The feedback signal of the sensor (4) is also switched to the tuning control circuit of the motor (Mb) by opening ₄ ) and closing the switch (S ₃ ).

Therefore, when the time point of T ₇ is reached, the speed difference ΔV = 0 and the elevator frame (6) is stopped, and all the guide rollers are driven in synchronization with the previous process speed V ₀ .

As described above, for the sake of convenience of explanation, there are four elevating side guide rollers and five fixed side guide rollers, that is, nine guide rollers in the apparatus.
In the case of a book, the guide roller (R ₀ ),
In the case of (R ₁ ), ... (R _n ), the total number of guide rollers is (n
+1), of which even-numbered guide rollers (R ₀ ), (R ₂ ), (R ₄ ) ... (R _n ) are fixed sides, and odd-numbered guide rollers (R ₁ ), (R ₃ ). , (R ₅ ) ... (R _n-1 ) are the guide rollers on the ascending and descending side, Becomes Then, this calculated value becomes the ascending / descending speed signal of the elevator frame (6), and the guide rollers (R ₁ ) and
The speeds of (R ₂ ) ... (R _n-2 ), (R _n-1 ), change in an arithmetic range, Of course,

Further, in FIG. 2, the acceleration / deceleration gradient of the motor (Mb) is shown as a constant gradient, but the acceleration / deceleration gradient setter (13) in this case keeps the change in acceleration / deceleration constant (differentiation of acceleration / deceleration). It is also possible to apply a device such as (fixing the value), and in this case, it is noted that smoother operation of each rotating part and moving part can be obtained during the transitional period (starting and stopping). .

(Effects of the Invention) As described above, in the accumulator according to the present invention, each guide roller is provided with a small speed variable motor, and each motor is controlled as described above. Since the speed is changed from the inlet side guide roller to the outlet side guide roller in an arithmetic series, only a very weak tension acts on the sheet in the accumulator when the accumulator is operating, and at that time. There is almost no fluctuation in the tension, and it is possible to sufficiently cope with the increase in the line speed or the sheet requiring a low tension.

Further, in this case, as described in claim 2, the calculated value obtained by dividing the speed difference between the inlet side guide roller and the outlet side guide roller by twice the total number of the elevating side guide rollers is defined as the elevating speed of the elevator frame. By positively driving the elevator frame, the sheet tension fluctuation due to the lifting motion of the elevator frame is prevented, and the effect of preventing the sheet tension fluctuation by the drive control of each guide roller by the motor is further ensured. .

Particularly, in the present invention, since the acceleration / deceleration gradient setting device is provided for the small speed variable motor attached to the outlet side guide roller, each rotating part of the accumulator at the time of stopping or restarting the subsequent process and The smooth operation of the moving part is obtained, and the above-mentioned effects are made more effective.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a sheet-like material speed difference absorption accumulator of the present invention, and FIG. 2 is an operation explanatory view of the accumulator shown in FIG. (R ₀ ), (R ₂ ), (R ₄ ), (R ₆ ), (R ₈ ) ... Fixed side guide roller, (R ₁ ), (R ₃ ), (R ₅ ), (R ₇ )… Elevator guide rollers, (m ₀ ), (m ₁ ) ... (m ₇ ) ... Small speed variable motor, (6) ... Elevator frame, (13) ... Acceleration / deceleration gradient setter.

Claims (2)

[Claims] 1. A front process comprising: a plurality of stationary guide roller groups provided on a machine frame; and a plurality of elevating guide roller groups provided on an elevator frame capable of moving up and down with respect to the machine frame. The sheet-like material sent from is passed through the inlet side guide roller of the fixed side guide roller group, which is located at the frontmost process side, and then sequentially stretched over the elevating side guide rollers and the fixed side guide rollers, and the fixing is performed. Out of the side guide roller group, it is fed to the subsequent step through the outlet side guide roller located in the rearmost step, and when a speed difference occurs between the front and rear steps, the elevating side guide roller group moves up or down to In the speed difference absorbing accumulator for absorbing the speed difference between the sheet-shaped objects, a small speed variable motor for rotating the guide rollers is provided on each of the fixed-side and up-and-down side guide rollers, and the small speed variable motor is provided. Of the motors provided with the guide rollers on the inlet side so that the peripheral speed of the guide rollers is the same as in the previous step, while the motor provided with the guide rollers on the outlet side has a peripheral speed of the guide rollers which is the speed of the subsequent step. The speeds corresponding to the changes are controlled respectively, and the value of the speed difference between the inlet side guide roller and the outlet side guide roller is divided by twice the total number of the elevating side guide rollers by the calculating means to calculate a value.
Using the calculated value as a tolerance, the peripheral speed of each guide roller from the peripheral speed of the guide roller on the inlet side to the peripheral speed of the guide roller on the outlet side is differentiated by an arithmetic series so that the peripheral speed of the guide rollers other than the guide rollers on the inlet side and the outlet side is different. While controlling each motor provided in each guide roller, an acceleration / deceleration gradient setter is provided in the small speed variable motor provided in the exit side guide roller, and the motor is re-driven in the stop of the post process and in the post process. A sheet-shaped object speed difference absorption accumulator characterized by enabling deceleration or acceleration to a set speed at a predetermined acceleration / deceleration gradient or a predetermined acceleration / deceleration change rate. 2. A calculated value obtained by dividing the speed difference between the inlet side guide roller and the outlet side guide roller by the calculation means by twice the total number of the lifting side guide rollers is set as the lifting speed of the elevator frame, and When the calculated value is positive, the elevator frame is positively driven in the sheet storage direction, while when the calculated value is negative, the elevator frame is positively driven in the sheet feeding direction. 1. A sheet-shaped material speed difference absorption accumulator according to 1.