JP2019063942A - Belt-like object cutting device - Google Patents

Abstract

To provide a belt-like object cutting device capable of preventing a subsequent belt-like object from colliding with a cut paper sheet even if a carrying speed of the belt-like object is increased.SOLUTION: An upstream carrying part 510 always carries dry paper 101 at a set speed to a cutting carrying part 520, and the cutting carrying part carries the dry paper at a speed substantially equal to the set speed to a downstream carrying part 540 via a cutting device 530 in normal control, and carrying of the dry paper is stopped in a state of sandwiching the dry paper in cutting control, and stays the dry paper carried from the upstream carrying part in a loop shape on a carrying path, and the dry paper is carried at a staying resolution speed faster than the set speed after the cutting control, and the downstream carrying part carries the dry paper at a speed substantially equal to the set speed in the normal control, and is stopped together with the cutting carrying part in the cutting control, and the cut paper sheet is carried to the downstream side at a discharge speed faster than the set speed after cutting, and a control part adjusts a stopping period and the starting resolution speed of the cutting carrying part in the cutting control based on an increase-decrease in the set speed of the upstream carrying part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a band-shaped material cutting device, and relates to a technology for cutting band-shaped paper in a paper making machine such as, for example, a waste paper recycling apparatus for recycling used paper.

  Conventionally, as this type of technology, for example, there is one described in Patent Document 1. This is a cutting device for used paper recycling apparatus, which cuts a paper-made banded paper into recycled paper of a predetermined size. The strip of paper is conveyed along the longitudinal direction by the conveyance section, and cut by a cutter in a direction intersecting the conveyance direction. The transport unit includes a transport roller provided upstream of the cutter in the transport direction of the strip, and a pressing roller disposed opposite to the transport roller and sandwiching the strip with the transport roller. Then, the pressing roller is raised by the skew feeding correction means to release the strip from the pinched state to be in the non-restrained state, and the traveling direction of the skewed sheet under the pinched state is corrected.

Patent No. 5906547

  In the used paper recycling apparatus described in Patent Document 1, when cutting a strip of paper with a cutter, the transport of the strip of paper is stopped by sandwiching the strip of paper between rollers at the front and back positions of the cutter. During this time, the subsequent sheet is being conveyed, and the sheet is warped on the upstream side of the conveying roller and the pressure roller, and the tension of the sheet becomes slack, which causes wrinkles.

  For this reason, after cutting by the cutter, the following bent strip of paper is quickly transported by the transport roller and the pressing roller to eliminate slack in tension of the strip of paper. In addition, the sheet-fed material after cutting is also discharged at a speed faster than the normal conveying speed.

  The recycled paper processing apparatus contains a plurality of processing units, such as a head box for carrying out each process of papermaking, a wire unit, a dewatering unit, a dryer unit, a finishing unit, etc., inside a casing. Normally the same is basically the same.

  In the case of reducing the thickness of the strip paper, for example, the paper thickness is adjusted by increasing the conveyance speed of the wire section without changing the supply amount of pulp suspension poured from the head box per unit time. There is. In this case, the transport speed passing through the drier part naturally becomes faster, but this is dealt with by adjusting the heating temperature according to the heating load.

  As a result, the thinner the thickness of the strip, the faster the normal transport speed, and the greater the transport speed, the greater the deflection of the strip during cutting. For this reason, in order to eliminate the subsequent deflection of the sheet after cutting, it is necessary to increase the speed at which the sheet is conveyed by the conveying roller and the pressing roller. However, if this speed is too fast, the subsequent sheet may collide with the sheet preceding the conveyance path downstream of the cutter.

  In order to miniaturize the used paper recycling apparatus, the processing units are arranged in proximity to each other. For this reason, the space for deflecting the strip in the transport path on the upstream side of the cutter also becomes narrow. For this reason, the strip-shaped paper is bent in a loop shape and becomes high, which causes a problem in eliminating the deflection of the strip-shaped paper.

  When the loop is low, the pinched state between the transport roller and the press roller is released to be in the unrestrained state, and the belt paper cancels the loop by the elastic force and restores the straight posture, and along the transport path To stretch. However, if the loop becomes too high, the force for restoring the straight posture weakens, and it becomes difficult to cancel the loop in the unconstrained state.

  The present invention solves the above-mentioned problems, and provides a strip cutting device capable of preventing a subsequent strip from colliding with a sheet after cutting even if the transport speed of the strip is increased. With the goal.

  In order to solve the above problems, the strip cutting device of the present invention arranges the upstream transport portion, the cutting transport portion, the cutting device, and the downstream transport portion on the transport path of the strip, and performs normal control and cutting of each portion. The upstream conveyance unit always conveys the strip to the cutting conveyance unit at a set speed in both normal control and cutting control, and the cutting conveyance unit has a speed substantially equal to the set speed in normal control. The strip is transported to the downstream transport unit through the cutting device, and the transport of the strip is stopped in a state of sandwiching the strip in the cutting control, and the strip transported from the upstream transport portion is looped on the transport path After the cutting control, the strip is conveyed at a retention canceling speed faster than the set speed, and the downstream conveyance unit conveys the strip at a speed substantially equal to the set speed in normal control, and together with the cutting conveyance unit in the cutting control Stop After cutting the strip, the sheet material after cutting is conveyed downstream at a discharge speed faster than the set speed, and the control unit sets the stopping time and the retention cancellation speed of the cutting conveyance unit in cutting control to the upstream conveyance unit. It is characterized by adjusting based on increase and decrease of speed.

  The strip cutting apparatus according to the present invention includes an upstream transport unit, a cutting transport unit, a cutting device, and a downstream transport unit on the transport path of the strip, and further includes a control unit that performs normal control and cutting control of each unit. The transport section transports the strip to the transport section for cutting at a set speed in both normal control and cutting control, and the transport section for cutting passes the strip at a speed substantially equal to the set speed in normal control through the cutting device Conveying to the downstream conveyance unit, stopping conveyance of the band in a state of holding the band in cutting control, causing the band conveyed from the upstream conveyance to stay in a loop on the conveyance path, and conveyance after cutting control In the initial stage of resumption or in the middle of conveyance, the pinched state of the band is released, the downstream conveyance section conveys the band at a speed substantially equal to the set speed in normal control, and stops together with the cutting conveyance section in cutting control. After cutting the object, the sheet material after cutting is conveyed downstream at a discharge speed higher than the set speed, and the control unit controls the stop time of the cutting conveyance unit in the cutting control based on the increase or decrease of the setting speed of the upstream conveyance unit. It is characterized by adjusting.

  In the strip cutting device according to the present invention, the control unit transports the strip at a retention speed that is faster than a set speed at the initial stage of transport resumption after cutting control in the transport unit for cutting. It is characterized in that it is adjusted to increase or decrease following the increase or decrease of the set speed.

  In the strip cutting device according to the present invention, the cutting transport unit has a pair of transport rollers facing each other through the strip, and stops in a state in which the strip is held between both transport rollers in cutting control, In the control, the strip is transported in a state of nipping between the transport rollers, and between the transport resumption initial stage after cutting control or in the middle of transport, the gap between both transport rollers is temporarily opened to release the nipping state with the strip. It features.

  In the strip cutting device according to the present invention, the cutting and conveying unit includes a loop accommodation space that allows the strip conveyed from the upstream conveyance to stay in a loop on the conveyance path on the upstream side of the pair of conveyance rollers. It is characterized by having a pressing portion for pressing the loop-like band-shaped material of the housing space portion toward the transport path.

In the band-shaped material cutting device of the present invention, the upstream conveyance section has a heating section for heating the band-shaped material,
The control unit changes the heating time of the strip by changing the time for the strip to pass through the heating unit, and changes the set speed according to the increase or decrease of the time for the strip to pass through the heating unit. .

  In the strip cutting device of the present invention, the control unit is characterized by having an input unit for changing and setting at least one of the time for the strip to pass through the heating unit and the heating temperature of the heating unit.

  The strip heating apparatus according to the present invention has a heating unit for heating the strip, and an input unit for changing and setting at least one of the time for the strip to pass through the heating unit and the heating unit. A strip heating device to be used.

  As described above, according to the present invention, the cutting and conveying section retains in a loop shape on the upstream conveying path by releasing the pinched state with respect to the band during initial stage of conveyance resumption after cutting control or during conveyance. An object extends downstream through the cutting and conveying section.

  The control unit adjusts the stop time of the cutting conveyance unit in the cutting control based on the increase or decrease of the set speed of the upstream conveyance unit to cut the sheet material after cutting to a position that does not disturb the conveyance of the subsequent strip. The time required to carry can be secured, and the strip can be properly carried and cut regardless of the increase in the set speed of the upstream carrying portion.

  In addition, by adjusting the stagnation elimination speed based on the increase or decrease of the setting speed of the upstream conveyance section, the deflection of the band-shaped material staying in a loop shape on the upstream conveyance path is large due to the increase of the setting speed of the upstream conveyance section. Even with this, the large deflection of the strip can be eliminated promptly.

  A force applied by the push-down portion is provided by providing the pressing portion for pressing the loop-shaped strip toward the transport path in the loop accommodation space portion where the cutting transport portion retains the strip in the loop shape on the transport path. This contributes to the elimination of the loop, and the strip can be quickly extended onto the transport path even if the loop of the strip is raised.

  With the control unit having the input unit that changes and sets the time for passing the heating unit of the strip, the degree of heating intended by the user can be appropriately adjusted, and the convenience is improved.

A schematic view showing a used paper recycling apparatus according to an embodiment of the present invention Flow chart showing normal control and disconnection control in the same embodiment Flow chart showing heating time control in the same embodiment

  Hereinafter, embodiments of the present invention will be described based on the drawings. In FIG. 1, the used paper processing apparatus 1 which is one type of paper making machine comprises a paper making apparatus 2 which makes a paper making process for making a band of wet paper 100 and a drying apparatus which makes a drying process for drying the wet paper 100 which is a band. 4 and an open top white water storage unit 5 for storing filtered water from the paper making process, and a control device (not shown) for controlling each unit.

  The waste paper processing apparatus 1 includes a dewatering process between the paper making process and the drying process, and the dewatering process includes a dewatering belt made of felt. Furthermore, in the present embodiment, although a strip of wet paper 100 and dry paper 101 obtained by preparing a pulp suspension is described as a strip as an example, an adhesive is added to the fiber as a strip. The elongated material formed into a belt shape is also a belt-like material in the present invention.

  The paper making apparatus 2 includes a paper making unit 20 and a wet paper dispersion unit 6. The paper making section 20 has a paper making wire 22 wound around the rollers 21 of the first group, and a head box 23 for supplying a pulp suspension to the paper making wire 22. The papermaking wire 22 is rotated in an endless track and travels across the wet paper web transfer path 22a and the return path 22b, and the wet paper web 100 is made on the wet paper web of the paper wire 22 in the wet paper web 22a. The formed wet paper web 100 is transferred to the drying device 4 of the next process at the end side of the wet paper web transfer path 22a. The paper making wire 22 is made of metal or synthetic resin, and has a mesh shape to have water permeability and air permeability.

  The wet paper web dispersing section 6 of the paper making apparatus 2 is detachably provided to the apparatus main body in the middle of a path where the drainage falls from the paper making wire 22 to the white water storage section 5. The wet paper web distributor 6 receives the wet paper web 100 falling from the wet paper web forming surface of the paper making wire 22 in the return path 22 b. In the present embodiment, the wet paper web dispersing section 6 has a dispersing plate 61 for receiving the wet paper web 100 falling from the paper making wire 22.

  Further, a cleaning nozzle 24 as a cleaning means is provided inside the endless track of the papermaking wire 22, and the cleaning nozzle 24 is directed to the back surface opposite to the wet paper web forming surface of the papermaking wire 22-. Release the cleaning solution.

  The paper making apparatus 2 has a pressing and dewatering unit 25. The squeezing and dewatering unit 25 includes a pair of squeezing and dewatering rollers 25 a and 25 b that sandwich the papermaking wire 22 and the wet paper web 100. The pressing and dewatering rollers 25a and 25b press the wet paper web 100 against the paper making wire 22, squeeze the wet paper web 100, and dewater it.

  And, the drying device 4 is disposed as the next process of the paper making device 2. The drying device 4 includes a drying roller 41 which forms a heating unit by incorporating a heating device such as a heater, and a canvas belt 415 which is stretched between the drying roller 41 and the plurality of rollers 412. In addition, a scraper unit 400 which peels the dry paper 101 of a strip from the drying roller 41 is disposed in sliding contact with the drying roller 41.

  A wet paper web transfer unit 301 is formed between the paper making unit 20 and the drying device 4. The wet paper web transfer section 301 is formed between the specific roller 21 a of the first group of rollers 21 of the paper making section 20 and the specific roller 412 a of the plurality of rollers 412 of the drying device 4.

  An upstream conveyance unit 510, a cutting conveyance unit 520, a cutting device 530, and a downstream conveyance unit 540 are sequentially arranged from the upstream side to the downstream side on the conveyance path of the dry paper 101 downstream of the scraper unit 400 in the conveyance direction. There is.

  The upstream conveyance unit 510 has a first conveyance roller pair 511 and 511, and here, the drying device 4 and the paper making apparatus 2 also constitute the upstream conveyance unit 510.

  As described above, in the present embodiment, the strip is a strip obtained by making a pulp suspension, but an elongated material formed by adding an adhesive to fibers is treated as a strip. In this case, the upstream conveyance unit is configured by a conveyance belt, a pressing roller, a heating roller, and the like. That is, fibers mixed with an additive such as an adhesive are deposited on the conveyance belt to form a band, which is conveyed while pressing the band by the pressing roller and conveyed while the band is heated by the heating roller.

  Next, the first conveying roller pairs 511 and 511 face each other up and down via the dry paper 101, and the dry paper 101 is always sent to the downstream-side conveying unit 520 at a set speed for both normal control and cutting control described later. Transport Normal control and disconnection control will be described in detail later.

  The cutting conveyance unit 520 includes the second conveyance roller pair 521a and 521b, and the upper non-driving side conveyance roller 521a is provided vertically movable with respect to the lower driving side conveyance roller 521b. There is.

  Further, a loop accommodation space 522 is provided on the conveyance path between the second conveyance roller pair 521a, 521b and the first conveyance roller pair 511, 511. The loop accommodation space 522 is a space for the dry paper 101 to bend in a loop at the time of cutting control. A push-down portion 523 is provided at the upper position of the loop accommodation space 522. The push-down portion 523 is convexly curved upward, and is provided so as to be vertically swingable around the axial center of the lower end support shaft 523a.

  The push-down portion 523 is lifted by the wet paper web 101 staying in a loop shape in the loop accommodation space 522 during cutting control and swings upward. Then, when the second conveyance roller pair 521a, 521b releases the state of holding the dry paper 101, the push-down portion 523 applies a force downward to the loop by its own weight.

  The cutter blade pairs 531 and 531 of the cutting device 530 are disposed opposite to each other via the transport path of the dry paper 101 on the downstream side of the second transport roller pair 521a and 521b in the transport direction.

  The downstream conveyance unit 540 has third conveyance roller pairs 541 and 541 at positions separated by a necessary and sufficient distance from the cutter blade pairs 531 and 531, and further has a fourth conveyance roller pair 542 and 542 on the downstream side in the conveyance direction. The third transport roller pairs 541 and 541 and the fourth transport roller pairs 542 and 542 are disposed to face up and down via the dry paper 101.

Hereinafter, the operation concerning the above-mentioned composition is explained.
(Papermaking process)
In the paper making section 20, a pulp suspension is supplied from the head box 23 to the paper making wire 22, and the wet paper web 100 is made on the wet paper forming surface of the paper making wire 22. The wet paper web 100 is transferred from the paper making unit 20 to the drying device 4 in the wet paper web transfer unit 301.

In the wet paper web transfer portion 301, the wet paper web 100 made on the wet paper web forming surface of the paper making wire 22 is a space by the paper paper wire 22 being reversed along the outer periphery of the specific roller 21a and separated from the wet paper web 100. The transfer is transferred to the canvas belt 415 which is inverted by the specific roller 412 a of the drying device 4.
(Drying process)
In the drying device 4, the canvas belt 415 to which the wet paper web 100 has been transferred advances toward the drying roller 41, sandwiches the wet paper web 100 between the canvas belt 415 and the drying roller 41, and the wet paper 100 is received by the heat received from the drying roller 41. Is dried to obtain a dry paper 101. Then, the scraper unit 400 peels the dry paper 101 from the drying roller 41.
(Finishing process)
The dry paper 101 separated from the drying roller 41 is conveyed by the first roller pair 511 and 511 of the upstream conveyance unit 510 toward the cutting conveyance unit 520, the cutting device 530, and the downstream conveyance unit 540. In the following steps, the control unit repeats normal control and disconnection control.
(Normal control)
As shown in FIG. 2, in normal control, the control unit operates the upstream conveyance unit 510 at a set speed, and operates the cutting conveyance unit 520 and the downstream conveyance unit 510 at a speed substantially equal to the set speed. Are transported (S1). Here, in order not to apply tension to the dry paper 101, the cutting conveyance unit 520 and the downstream conveyance unit 510 are set to a speed slower than the set speed, for example, about 95% to 99.9% of the set speed. It is preferable to adjust.

Next, it is determined whether the leading edge of the dried paper 101 to be conveyed has reached a set distance based on the cutter blade pair 531 and 531 of the cutting conveyance unit 520, for example, a distance corresponding to the length in the longitudinal direction A4. To do (S2).
(Cut off control)
The control unit performs cutting control when the transport distance of the dry paper 101 reaches the set distance. That is, the cutting conveyance unit 520 and the downstream conveyance unit 540 are stopped, and the dried paper 101 is held by the second conveyance roller pair 521a and 521b, the third conveyance roller pair 541 and 541, and the fourth conveyance roller pair 542 and 542 To be in a restricted state (S3).

  Then, the cutting device 530 is operated to cut the dried paper 101 with the cutter blade pair 531 and 531 (S4).

  The first conveyance roller pair 511, 511 of the upstream conveyance unit 510 conveys the dry paper 101 toward the cutting conveyance unit 520 at a set speed at all times in both normal control and cutting control. For this reason, the dried paper 101 is bent upward in the form of a loop with a set height Hr on the conveyance path between the first conveyance roller pair 511, 511 and the second conveyance roller pair 521a, 521b, and the loop accommodation space portion Stays at 522

  The loop of the dried paper 101 staying in the loop accommodation space 522 lifts the push-down portion 523 and the push-down portion 523 swings upward around the pivot 523 a.

  When the cutting device 530 cuts the dry paper 101, the downstream conveyance unit 540 receives the sheet (cut material) of the dry paper 101 after cutting at a discharge speed faster than the set speed (paper making speed) on the downstream side High-speed transport toward (omitted) (S5).

  It is judged whether this dry paper 101 is thick paper or not (S6), and the rear end of the conveyance direction of the sheet is separated from the cutting edge of the cutter blade pair 531, 531 by the set distance Lset downstream in the conveyance direction To judge. In the case of thin paper, for example, it is determined whether or not 18 mm is conveyed (S7), and in the case of thick paper, for example, it is determined whether or not 12 mm is conveyed (S8).

  This judgment is based on the following reasons. In a state where the downstream conveyance unit 540 conveys the sheet material of the dried paper 101, when the pinched state of the second conveyance roller pair 521a and 521b of the cutting conveyance unit 520 is released, the dried paper 101 retained in the loop accommodation space 522 Is rapidly sent downstream in the transport direction, and the loop is eliminated.

  At this time, the trailing end of the preceding sheet of dry paper 101 is separated downstream by the set distance Lset in the maximum distance Lmax from the cutting edge of the cutter blade pair 531, 531 to the third conveying roller pair 541, 541 If not, the leading end of the subsequent strip of dry paper 101 collides to cause jamming. For this reason, the determination described above is performed.

  Then, the control unit maintains the nipping state of the second transport roller pair 521 a and 521 b of the cutting transport unit 520 until the rear end of the dry paper 101 in the transport direction is transported by 12 mm or 18 mm as described above. Restrain the 101 band.

  Here, change control of the set speed (paper-making speed) of the upstream conveyance unit 510 will be described. When the supply amount of the pulp suspension supplied from the head box 23 to the paper making wire 22 is maintained constant, the thickness of the wet paper web 100 is adjusted by increasing or decreasing the set speed (paper making speed) of the paper making wire 22. . By maintaining the supply amount of the pulp suspension constant, it is possible to adjust the thickness while securing the quality of the wet paper web 100 stable.

  For example, if the feed rate of the pulp suspension is kept constant and the setting speed (paper making speed) of the paper making wire 22 is increased, the thickness of the wet paper 100 and the dry paper 101 decreases and becomes thinner. The amount of slack of the dry paper 101 generated at the time of cutting control is increased. Therefore, the control unit maintains the nipping state of the second transport roller pair 521a and 521b of the cutting transport unit 520 until the rear end of the dry paper 101 in the transport direction is transported by 18 mm as described above. Restrain the band of

  The papermaking wire 22, the drying roller 410, and the first conveying roller pairs 511 and 511 do not have to convey the wet paper 100 at the same speed, and may convey the wet paper 100 at different speeds. As a result, breakage or sagging of the wet paper web 100 in the paper making process can be prevented, and the paper can be properly transported.

  Also, if the feed rate of the pulp suspension is kept constant and the setting speed (paper making speed) of the paper making wire 22 is decreased, the thickness of the wet paper 100 and the dry paper 101 increases and becomes thicker, and the setting speed decreases. The amount of slack of the dry paper 101 generated at the time of cutting control is reduced. For this reason, the control unit maintains the nipping state of the second transport roller pair 521a and 521b of the cutting transport unit 520 until the rear end of the dry paper 101 in the transport direction is transported by 12 mm as described above. Restrain the band of

  Therefore, the stop time of the cutting conveyance unit 520 in the cutting control is adjusted based on the increase and decrease of the set speed (paper-making speed) of the upstream conveyance unit 510.

  The control unit can lengthen the stop time of the cutting conveyance unit 520 in the cutting control when the setting speed of the upstream conveyance unit 510 is high and the setting speed of the upstream conveyance unit 510 is high. In this case, it is possible to easily avoid that the following strip collides with the rear end of the preceding cut when the nipping state is released. The release of the clamping state can eliminate the loop.

  When the clamping state is not released, a collision can be avoided. At that time, the loop can be eliminated by adjusting the acceleration of the stagnation elimination speed and the maximum speed to an appropriate value.

  The control unit can shorten the stop time of the cutting conveyance unit 520 in the cutting control when the setting speed of the upstream conveyance unit 510 is high and the setting speed of the upstream conveyance unit 510 is high. In this case, the loop can be properly eliminated. At that time, when the conveyance of the cutting conveyance unit 520 is resumed before releasing the holding state, and the conveyance speed at the time of the conveyance restart is made slower than when the setting speed of the upstream conveyance unit 510 is low, the holding state is released. Can reduce the risk of collision.

  When the clamping state is not released, a collision can be avoided. Further, by setting the transport speed at the time of resuming transport of the strip by the cutting transport unit 520 slower than when the set speed of the upstream transport unit 510 is low, the risk of collision can be further reduced.

  The control unit can increase the retention speed of the cutting conveyance unit 520 in the cutting control when the setting speed of the upstream conveyance unit 510 is high and the setting speed of the upstream conveyance unit 510 is high. In this case, the loop can be properly eliminated. Further, by making the stopping time longer, it is possible to avoid a collision when the nipping state is released. And when not canceling a pinching state, a collision can be canceled.

  The control unit can make the stagnation elimination speed of the cutting conveyance unit 520 in the cutting control slower than when the setting speed of the upstream conveyance unit 510 is high than when the setting speed is high. In this case, it is difficult to make a collision. In addition, the loop can be eliminated by releasing the clamping state.

  And when not canceling the pinched state, if necessary, shorten the stop time at the time of cutting, or after resuming the conveyance of the strip by the cutting conveyance unit 520, the time until reaching the maximum speed at the stagnation cancellation speed By shortening, it is possible to eliminate the loop.

  That is, as the setting speed (paper making speed) of the upstream conveyance unit 510 is higher, the loop of the dry paper 101 staying in the loop accommodation space 522 becomes longer and longer while the cutting conveyance unit 520 is stopped. When the nipping state of the second conveyance roller pair 521a, 521b is released, the dried paper 101 rapidly fed to the downstream side in the conveyance direction reaches far.

  For this reason, the stop time of the cutting conveyance unit 520 is set to be longer as the set speed (paper making speed) of the upstream conveyance unit 510 is increased.

  In addition, as the setting speed (papermaking speed) of the upstream conveyance unit 510 is lower, the loop of the dry paper 101 staying in the loop accommodation space 522 becomes smaller and shorter while the cutting conveyance unit 520 is stopped. When the nipping state of the second conveyance roller pair 521a and 521b is released, the distance which the dry paper 101 which is rapidly fed to the downstream side in the conveyance direction reaches is shortened.

  For this reason, the stop time of the cutting conveyance unit 520 is set to be shorter as the set speed (paper making speed) of the upstream conveyance unit 510 decreases. By shortening the stop time of the cutting conveyance unit 520, it is possible to suppress the occurrence of wrinkles, warpage, and the like that are more likely to occur as the dry paper 101 becomes thicker at the time of loop formation.

  Next, when the trailing end of the preceding sheet of dry paper 101 is separated from the cutting edge of the pair of cutter blades 531 and 531 by the set distance Lset downstream in the transport direction, the control returns from the cutting control to the normal control.

  That is, the nipping state of the second conveyance roller pair 521a, 521b of the cutting conveyance unit 520 is released (S9). This opening is performed by moving the upper non-driving side conveyance roller 521a upward with respect to the lower driving side conveyance roller 521b.

  By the release of the holding state, the dried paper 101 staying in the loop accommodation space 522 is rapidly fed to the downstream side in the transport direction, and the loop is eliminated. When the loop is low, the strip of the dry paper 101 is canceled by the elastic force in a short time to restore the stretchable posture in a short time, and extends along the transport path.

  If the loop becomes too high, the force to restore the flexible posture weakens, and it becomes difficult to cancel the loop in the unconstrained state.

  However, the push-down portion 523 is lifted by the wet paper web 101 staying in a loop shape in the loop accommodation space 522 at the time of cutting control and is swung upward, and the second transport roller pair 521a, 521b sandwich the dried paper 101 The push-down portion 523 exerts a downward force on the loop by its own weight when it is released.

  The force applied by the depressing portion 523 contributes to the elimination of the loop, and the strip of the loop can be quickly extended onto the transport path even if the loop of the dry paper 101 becomes high. Further, the sheet feeding of the dry paper 101 is corrected by releasing the nipping state of the second conveyance roller pair 521a and 521b.

  Next, it is determined whether or not the state of opening the second conveyance roller pair 521a, 521b has passed the set opening time (S10).

  When the elapsed time satisfies the set open time, the nipping state of the second conveyance roller pair 521a, 521b is resumed (S11).

  That is, the upper non-driving side conveyance roller 521a is moved downward, and the dried paper 101 is nipped by the lower driving side conveyance roller 521b and the upper non-driving side conveyance roller 521a to resume the conveyance. The strip-like dry paper 101 is fed through the cutting device 530 toward the downstream conveyance unit 540 onto the conveyance path.

  At this time, in the present embodiment, the cutting conveyance unit 520 conveys the dry paper 101 at a retention resolution speed faster than the set speed at the initial stage of conveyance resumption after cutting control. This retention speed is set in the range of 115% to 130% of the set speed (paper making speed).

  Then, the presence or absence of the slack of the dry paper 101 is determined (S12), and when the slack is eliminated, the transport speed of the cutting transport unit 520 is returned to the set speed.

  The control unit increases / decreases the retention speed of the cutting conveyance unit 520 in accordance with the increase / decrease of the set speed (paper-making speed) of the upstream conveyance unit 510. For this reason, the slack of the dry paper 101 is promptly eliminated.

  When the conveyance speed of the upstream conveyance unit 510 is low, the conveyance speed of the cutting conveyance unit 520 is also slowed to adjust the tension related to the strip and prevent the strip from being damaged.

  In the present embodiment, release of the nipping state of the second conveyance roller pair 521a, 521b is performed at the initial stage of conveyance resumption after cutting control. However, the conveyance by the cutting conveyance unit 520 is resumed while maintaining the nipping state of the second conveyance roller pair 521a and 521b prior to the release of the nipping state, and then the nipping state of the strip with respect to the dry paper 101 is It is also possible to cancel.

  Further, in the present embodiment, the nipping state of the second conveyance roller pair 521a, 521b is released, but it is also possible to operate without completely opening it.

  Furthermore, the cutting conveyance unit 520 may be configured not to include a mechanism for releasing the nipping state without the second conveyance roller pair 521a and 521b approaching and separating. In this case, the rotational drive and the rotational stop of the second conveyance roller pair 521a, 521b are repeated. Then, the timing at which the rotational driving of the second conveyance roller pair 521a, 521b is restarted, that is, the timing at which the cutting conveyance unit 520 restarts the conveyance of the wet paper 100 after the dry paper 101 is cut by the cutting device 530. The conveyance speed of the unit 520 is adjusted in accordance with the conveyance speed of the upstream conveyance unit 510.

  In this case, since the slack of the dry paper 101 is not eliminated at one time by the release of the nipping state of the second conveyance roller pair 521a, 521b, the following dry paper is used for the sheet of the first dry paper 101. A collision of the belts 101 does not occur.

  Therefore, the control unit increases / decreases the stop time of the cutting conveyance unit 520 in cutting control in accordance with the increase / decrease of the set speed (paper making speed) of the upstream conveyance unit 510, and the stagnation elimination speed of the cutting conveyance unit 520 Is adjusted to follow the increase or decrease of the set speed (paper-making speed) of the upstream conveyance unit 510.

  For example, as the set speed (paper-making speed) of the upstream conveyance unit 510 increases, the stop time of the cutting conveyance unit 520 is shortened, and the resumption of operation of the cutting conveyance unit 520 after cutting control is accelerated. By suppressing the increase in the amount of sag of the dry paper 101 due to the increase of (the paper making speed) and making the residence elimination speed fast so as not to cause a collision, the sag of the dry paper 101 can be quickly eliminated.

  Next, the thickness of the wet paper 100 is adjusted by maintaining the feed rate of the pulp suspension supplied from the head box 23 to the paper making wire 22 constant and increasing or decreasing the set speed (paper making speed) of the paper making wire 22. In this case, the rotational speed of the motor is adjusted by adjusting the supply current or the supply voltage to the motor that drives the cutting device 530. Thus, the time required for cutting the dry paper 101 by the cutting device 530 may be adjusted according to the thickness of the dry paper 101. In particular, when the set speed of the upstream conveyance unit 510 is increased, by shortening the time required for cutting the dry paper 101, it is possible to suppress an increase in the amount of sag of the dry paper 101 at the time of cutting control.

  Further, the thickness of the wet paper web 100 is adjusted by maintaining the set speed (paper making speed) of the paper making wire 22 constant and increasing or decreasing the amount of supply of the pulp suspension supplied from the head box 23 to the paper making wire 22. Is also possible.

  Furthermore, it is also possible to provide the control unit with an input unit for changing and setting the heating time for the wet paper web 100 to pass through the drying device (heating unit) 4 or the heating temperature of the drying device (heating unit).

  With this configuration, when the user determines that the heating on the dry paper 101 is insufficient or when the heating is determined to be excessive, the heating time and the heating temperature can be arbitrarily changed.

  Hereinafter, control when the user changes the heating time will be described with reference to FIG.

  Paper making is started, and it is determined whether or not drying adjustment for changing the heating time has been instructed (S13).

  When the drying adjustment is instructed, it is determined whether or not the current operating condition is in the cutting control (S14).

  After the timing of the cutting control, it is determined whether the drying adjustment is an instruction to increase or decrease the heating time (S15).

  In the case of an instruction to increase the heating time, the conveyance speeds of the drying roller 41, the first conveyance roller pairs 511, 511, the cutting conveyance unit 520, and the downstream conveyance unit 540 are reduced (S16).

  Due to the deceleration of the conveyance speed of each part in S16, a speed difference is generated between the papermaking wire 22 on the upstream side and a slack is formed on the wet paper web 100. After waiting for the completion of deceleration of the transport speed of each part in S16 (S17), the amount of supply of the head box 23 is reduced and the transport speed of the papermaking wire 22 is reduced (S18).

  The transport speed of the papermaking wire 22 is checked (S19), and control returns to the normal control.

  In the case of the instruction to decrease the heating time, the feed rate of the head box 23 is increased, and the transport speed of the papermaking wire 22 is accelerated (S20).

  Due to the acceleration of the transport speed of the papermaking wire 22 in S20, a speed difference occurs between the drying roller 41 and the cutting transport unit 520, and a slack is formed on the wet paper web 100. After waiting for the completion of the acceleration of S20 (S21), the conveyance speed of the drying roller 41 and the conveying part 520 for cutting is accelerated (S22).

  The conveyance speed of the drying roller 41 is confirmed (S23), and the control returns to the normal control.

  By the above-described operation, the time for the wet paper web 100 to stay in the drying device 4 is increased or decreased. Also, by adjusting the feed rate of the pulp suspension to be supplied from the head box 23 to the papermaking wire 22 according to the increase or decrease of the transport speed of the drying device 4, the thickness of the wet paper 100 is made equal before and after the drying adjustment. I assume.

  It is not necessary to provide the above-described control unit with an input unit for changing and setting the heating time for the wet paper 100 to pass through the drying device (heating unit) 4 or the heating temperature of the drying device (heating unit). There is no need for the user to set the heating time.

  The downstream transport unit may transport the sheet material at a discharge speed faster than the set speed after cutting the strip, and may discharge at the same speed as the set speed after cutting the strip, or is slower than the set speed It may be discharged at a speed. In these cases, for example, by appropriately adjusting the transport resumption timing of the transport unit 520 for cutting, the release timing of the nipping state, the stagnation cancellation speed, etc., the following strip is prevented from coming in contact with the preceding sheet. can do.

DESCRIPTION OF SYMBOLS 1 waste paper processing apparatus 2 paper making apparatus 4 drying apparatus 5 white water storage part 6 wet paper dispersion part 20 paper making part 21 1st group roller 21a specific roller 22 paper making wire 22a wet paper web transfer path 22b return path 23 head box 24 washing nozzle 25 squeezing dewatering unit 25a, 25b squeezing dewatering roller 41 drying roller 61 dispersing plate 100 wet paper 101 dry paper 301 wet paper transferring unit 400 scraper unit 412 roller 412a specific roller 415 canvas belt 510 upstream conveying unit 511, 511 first conveying roller Pair 520 conveyance part 521a, 521b second conveyance roller pair 522 loop accommodation space part 523 push-down part 523a spindle 530 cutting device 531, 531 cutter blade pair 540 downstream conveyance part 541, 543 third conveyance roller pair 542, 543 4 transport roller pairs

Claims (8)

An upstream conveyance unit, a cutting conveyance unit, a cutting device, and a downstream conveyance unit are disposed on the conveyance path of the strip, and a control unit is provided to perform normal control and cutting control of each unit.
The upstream transport section transports the strip at a set speed to the cutting transport section at all times under normal control and cutting control,
The conveying unit for cutting conveys the strip at a speed substantially equal to the set speed in the normal control to the downstream conveying unit through the cutting device, and stops the conveyance of the strip in a state in which the strip is held in the cutting control. The belt-like material transported from the unit is retained in a loop on the transportation path, and after cutting control, the belt-like material is transported at a stagnation eliminating speed faster than a set speed;
The downstream transport section transports the strip at a speed substantially equal to the set speed in the normal control, and stops together with the cutting transport section in the cutting control, and the sheet after cutting at a discharge speed faster than the set speed after the strip is cut. Transport downstream,
What is claimed is: 1. A band-shaped object cutting apparatus comprising: a control unit that adjusts a stopping time and a retention speed of a cutting conveyance unit in cutting control based on increase and decrease of a set speed of an upstream conveyance unit. An upstream conveyance unit, a cutting conveyance unit, a cutting device, and a downstream conveyance unit are disposed on the conveyance path of the strip, and a control unit is provided to perform normal control and cutting control of each unit.
The upstream transport section transports the strip at a set speed to the cutting transport section at all times under normal control and cutting control,
The conveying unit for cutting conveys the strip at a speed substantially equal to the set speed in the normal control to the downstream conveying unit through the cutting device, and stops the conveyance of the strip in a state in which the strip is held in the cutting control. The belt-like material transported from the unit is retained in a loop on the transportation path, and in the initial stage of transportation resumption after cutting control, or in the middle of transportation, the pinched state of the belt-like material is released.
The downstream transport section transports the strip at a speed substantially equal to the set speed in the normal control, and stops together with the cutting transport section in the cutting control, and the sheet after cutting at a discharge speed faster than the set speed after the strip is cut. Transport downstream,
What is claimed is: 1. A band-shaped object cutting apparatus, wherein the control unit adjusts the stop time of the cutting conveyance unit in the cutting control based on an increase or decrease of a set speed of the upstream conveyance unit.   The control unit causes the strip transport unit to transport the strip at a stagnation cancellation speed faster than the set speed at the initial stage of transport resumption after cutting control, and increases or decreases the stagnation cancellation speed by increasing or decreasing the set speed of the upstream transport unit. The band-shaped material cutting device according to claim 2, characterized in that it is adjusted.   The cutting conveyance unit has a pair of conveyance rollers facing each other via a strip, and stops in a state in which the strip is held between both conveyance rollers in cutting control, and in a normal control, a strip is interposed between both conveyance rollers 4. The apparatus according to claim 2, wherein the article is conveyed in a state in which the object is nipped, and the conveyance rollers are temporarily opened between conveyance rollers at the initial stage of conveyance resumption after cutting control or during conveyance. Strip-cutting device as described.   The cutting and conveying unit includes a loop accommodation space that allows the strip conveyed from the upstream conveyance to stay in a loop on the conveyance path on the upstream side of the pair of conveyance rollers, and the looped strip of the loop accommodation space. The belt-like object cutting apparatus according to claim 4, further comprising: a pressing portion configured to press the sheet toward the transport path. The upstream conveyance unit has a heating unit that heats the band-like material,
The control unit changes the heating time of the strip by changing the time for the strip to pass through the heating unit, and changes the set speed according to the increase or decrease of the time for the strip to pass through the heating unit. The band-shaped material cutting device according to any one of claims 1 to 5.   The strip cutting apparatus according to claim 6, wherein the control unit has an input unit for changing and setting at least one of a time during which the strip passes through the heating unit and a heating temperature of the heating unit. What is claimed is: 1. A strip heating apparatus comprising: a heating unit for heating a strip; and an input unit for changing and setting at least one of a heating time and a time during which the strip passes through the heating unit.

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