JP4139718B2 - Sheet thickness measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet thickness measuring apparatus, and more particularly to an apparatus for easily and accurately measuring a sheet thickness on-line as well as off-line at a sheet manufacturing site such as a film.
[0002]
[Prior art]
Conventionally, as a method of measuring the thickness of a sheet sampled at a sheet manufacturing site such as a film, there are a method using a pressure measuring device and a method using a stylus measuring device. However, since the thickness cannot be measured continuously over the entire length or width of the sheet by the conventional method using the pressure measuring apparatus, when the thickness profile over the entire length or width of the sheet is to be obtained. Not suitable. In addition, in the conventional method using a stylus type measuring device, if the measurement stylus compresses the sheet, a measurement error occurs, and if the measurement stylus acts as a brake, the sheet is measured for elongation. An error will occur.
[0003]
Therefore, the present inventor has developed a rotary caliper meter as disclosed in Japanese Patent Laid-Open No. 2002-168601 (Patent Document 1) as a solution to such problems of the conventional method. This rotary caliper meter has a measuring roll / pinch roll that can be displaced according to the thickness of the sheet whose thickness is to be measured, and the sheet whose thickness is to be measured is sandwiched between the measuring roll / pinch roll. A feed roll for feeding the sheet as described above, a detection means for outputting a signal indicating the amount of displacement of the measurement roll / pinch roll, a measurement value of the thickness of the sheet by processing an output signal from the detection means Signal processing means for providing.
[0004]
According to such a rotary caliper meter, it is possible to measure the sheet thickness continuously over the entire length of the sheet of a predetermined length by driving the feed roll and backup roll, and it is very easy and quick. Measurement can be performed over the entire length of the sheet. Further, since the measurement roll also serves as the driving of the sheet, it is not necessary to apply tension to the measurement target sheet, so that more accurate measurement can be performed.
[0005]
[Patent Document 1]
JP 2002-168601 A
[0006]
[Problems to be solved by the invention]
Recently, however, there has been a demand for application not only to off-line sample sheet thickness measurement but also to sheet thickness measurement in a sheet production line. The rotary caliper meter as described above has no problem in measuring the thickness of the sheet sampled at the production site of film or the like offline, but it is used for measuring the thickness of the sheet in the sheet production line. There is room for improvement. Furthermore, recently, it has been found that in the case of analyzing the quality of a sheet or the like, it is impossible to perform a precise analysis only by measuring the thickness change of one line in the sheet surface. There has also been a demand for application to the measurement of thickness change over the entire sheet surface for precise analysis. The rotary caliper meter as described above is not fully developed in terms of application to the measurement of the thickness change over the entire sheet surface, and cannot satisfy such a request satisfactorily. Absent.
[0007]
An object of the present invention is to provide a sheet thickness measuring apparatus capable of sufficiently satisfying the above-described demand.
[0008]
[Means for Solving the Problems]
According to one aspect of the present invention, in a sheet thickness measuring apparatus for measuring the thickness of a sheet, a measurement roll and pinch roll that can be displaced according to the thickness of the sheet whose thickness is to be measured; A backup roll that receives the sheet so that the sheet whose thickness is to be measured is sandwiched between the measuring roll and the pinch roll, and a displacement amount of the measuring roll and the pinch roll is detected and a signal indicating the displacement amount is output. Detecting means, moving means for moving the measuring roll / pinch roll, the backup roll and the detecting means between an offline position and an online position, the measuring roll / pinch roll and the backup roll, Roll driving means for driving the sheet to be measured so as to have the same peripheral speed as the online traveling speed of the sheet whose thickness is to be measured; Sheet thickness, characterized in that it comprises a signal processing means for processing the output signal from the means for providing a measure of the thickness of the sheet measuring apparatus is provided.
[0009]
According to one embodiment of the present invention, there is further provided elevating means for elevating and lowering the measurement roll / pinch roll with respect to the backup roll.
[0010]
According to another embodiment of the present invention, the roll driving means includes synchronizing means for rotating the measuring roll / pinch roll and the backup roll in synchronization.
[0011]
According to still another embodiment of the present invention, the signal processing means includes a memory for storing zero point correction data, and gives a measurement value corrected by the zero point correction data stored in the memory.
[0012]
According to another aspect of the present invention, in a sheet thickness measuring device for measuring the thickness of a sheet, a measurement roll and pinch roll that can be displaced according to the thickness of the sheet whose thickness is to be measured, A feed roll / backup roll for feeding the sheet so as to sandwich the sheet whose thickness is to be measured between the measurement roll / pinch roll and a displacement amount of the measurement roll / pinch roll to detect the displacement Detection means for outputting a signal indicating the amount of displacement, table means for placing the sheet whose thickness is to be measured, and the sheet which is placed on the table means and whose thickness is to be measured is the measurement roll Sheet extruding means for extruding between the cum-pinch roll and the feed roll / backup roll; and the table means as the measuring roll-pinch roll and the A moving means for moving the sheet in the direction crossing the feeding direction of the sheet by the feed roll and backup roll; and a signal processing means for processing an output signal from the detecting means to give a measured value of the thickness of the sheet, An apparatus for measuring sheet thickness is provided.
[0013]
According to one embodiment of the present invention, the signal processing means includes a memory for storing zero point correction data, and provides a measurement value corrected by the zero point correction data stored in the memory.
[0014]
According to another embodiment of the present invention, the measurement value given by the signal processing means is measured with the dots having different colors or lightness colors depending on the magnitude of the measurement value. It further comprises printing means for printing out on a printing surface having the same or similar spread as the entire surface of the sheet to be printed.
[0015]
According to still another aspect of the present invention, a sheet thickness measuring apparatus for measuring the thickness of a sheet includes a detection unit that can be moved in a direction crossing the traveling direction of the sheet whose thickness is to be measured. The detection unit includes a measurement roll / pinch roll that can be displaced according to a thickness of the sheet whose thickness is to be measured, and a sheet whose thickness is to be measured between the measurement roll / pinch roll. A backup roll that catches the sheet so as to be sandwiched, a detection means that detects a displacement amount of the measurement roll / pinch roll and outputs a signal indicating the displacement amount, the measurement roll / pinch roll, and the backup roll, Roll driving means for driving the sheet so as to have the same peripheral speed as the traveling speed of the sheet whose thickness is to be measured, and further processing an output signal from the detecting means Sheet thickness, characterized in that it comprises a signal processing means for providing a thickness measure of the serial sheet measuring device is provided.
[0016]
According to one embodiment of the present invention, the roll driving means includes synchronizing means for rotating the measuring roll / pinch roll and the backup roll in synchronization.
[0017]
According to another embodiment of the present invention, the measurement roll / pinch roll and the backup roll are each supported by a turning support device.
[0018]
According to still another embodiment of the present invention, the signal processing means includes a memory for storing zero reading data and / or zero correction data, and the zero reading data and / or zero correction stored in the memory. Gives the measurement corrected by the data.
[0019]
According to still another aspect of the present invention, in a sheet thickness measuring apparatus for measuring the thickness of a sheet, the sheet whose thickness is to be measured is received and has the same peripheral speed as the traveling speed of the sheet. A backup roll that is driven to rotate; and a detection unit that can be moved in a direction crossing a traveling direction of the sheet whose thickness is to be measured, and the detection unit is configured to transfer the sheet whose thickness is to be measured to the backup A measurement roll / pinch roll that is sandwiched between the rolls and can be displaced according to the thickness of the sheet, and a detection that detects a displacement amount of the measurement roll / pinch roll and outputs a signal indicating the displacement amount Means and a roll driving means for driving the measurement roll / pinch roll so as to have the same peripheral speed as the traveling speed of the sheet whose thickness is to be measured. Sheet thickness, characterized in that processes the output signal from the means comprises signal processing means for providing a measure of the thickness of the sheet measuring apparatus is provided.
[0020]
According to an embodiment of the present invention, the detection means includes a magnetic sensor that outputs a signal corresponding to the distance to the peripheral surface of the backup roll.
[0021]
According to another embodiment of the present invention, the detection means includes a magnetic sensor for measurement that outputs a signal corresponding to a distance to the circumferential surface of the measurement roll and pinch roll, and a circumferential surface of the backup roll. A correction magnetic sensor that outputs a signal corresponding to the distance.
[0022]
According to still another embodiment of the present invention, the measurement roll / pinch roll is supported by a turning support device.
[0023]
According to still another embodiment of the present invention, the signal processing means includes a memory for storing zero reading data and / or zero correction data, and the zero reading data and / or zero correction stored in the memory. Gives the measurement corrected by the data.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Next, based on an accompanying drawing, the present invention is explained in detail about an embodiment and an example of the present invention.
[0025]
FIG. 1 is a schematic elevational view showing mechanical components of a sheet thickness measuring apparatus as one embodiment of the present invention capable of measuring sheet thickness even on-line. As shown in FIG. 1, the sheet thickness measuring apparatus of this embodiment includes a base portion 20, a moving table 20A that is installed on the base portion 20 and can move in the direction of the arrow, and on the moving table 20A. The stepping motor 21 fixedly held on the upright support column 23 and the tip of a support rod 22B supported so as to be able to rotate by a bearing unit 22A mounted and fixed on the moving table 20A are attached to this support. A backup roll 22 that can rotate as the rod 22B rotates, and a tip of a support rod 25B that is supported so that one end can be rotated by a bearing unit 25A provided at the other end of a leaf spring 24 that has one end fixed to the support column 23. And a measurement roll / pinch roll 25 that can be rotated as the support rod 25B rotates, And mainly comprises a magnetic sensor 27 arranged to face upwardly of the support beam 27A is mounted fixedly held to the other end of and measuring roll and pinch roll 25 fixed holding one end to the upper end of the column 23. In this case, the measurement roll / pinch roll 25 is preferably made of a magnetic material.
[0026]
In the sheet thickness measuring apparatus of this embodiment, a bearing unit 25C that holds the intermediate portion of the support rod 25B so as to be rotatable is provided at the intermediate portion of the support rod 25B. An air cylinder 27B for raising and lowering the measurement roll / pinch roll 27 is attached to an intermediate portion of the beam 27A. The air cylinder 27B acts on the bearing unit 25C via the spring 27C so that the measurement roll / pinch roll 25 can be moved up and down, and the measurement unit as described later is moved between the offline position and the online position by the movement of the moving table 20A. When moving forward and backward, the measuring roll / pinch roll 25 is raised so that no force is applied in the lateral direction of the sheet. The leaf spring 24 always acts on the measuring roll / pinch roll 25 in such a direction that the outer peripheral surface of the measuring roll / pinch roll 25 comes into contact with the outer peripheral surface of the backup roll 22.
[0027]
Furthermore, in the sheet thickness measuring apparatus of this embodiment, the spur gear 31 is attached to the intermediate portion of the support rod 22B, and the spur gear 30 is also attached to the support rod 25B. The spur gear 31 and the spur gear 30 can be engaged with each other. On the other hand, a timing pulley 21A is provided on the drive shaft of the stepping motor 21, and a timing pulley 22C is also provided on the support rod 22B. A timing belt is provided between the timing pulley 21A and the timing pulley 22C. 21B is hung. Therefore, when the stepping motor 21 is energized, the support rod 22B is rotationally driven through the timing pulley 21A, the timing belt 21B, and the timing pulley 22C, and the backup roll 22 is rotationally driven. Due to the engagement with the gear 30, the support rod 25 </ b> B is also rotationally driven, and therefore the measurement roll / pinch roll 25 is also rotationally driven. In this case, the backup roll 22 and the measurement roll / pinch roll 25 are driven to rotate synchronously through the engagement of the spur gear 31 and the spur gear 30. Further, the leaf spring 24 allows the upward displacement of the roll 25 by the thickness of the sheet between the rolls 22 and 25, but continues to act to press the roll 25 against the loin 22 through the sheet. It can be. At this time, since the upward shift amount of the roll 25 is very small, the normal engagement between the spur gear 30 and the spur gear 31 is not affected.
[0028]
The magnetic sensor 27 is sandwiched between the backup roll 22 and the measurement roll / pinch roll 25 by sensing the upward movement of the measurement roll / pinch roll 25 as described above and outputting a signal corresponding thereto. Indicate the thickness of the printed sheet.
[0029]
In the above-described embodiment, the spur gear is used as a means for synchronizing the rotational drive between the backup roll 22 and the measurement roll / pinch roll 25. However, the invention is not limited to this, and a timing belt is used. Alternatively, both rolls can be driven by separate stepping motors or synchronous motors.
[0030]
Further, when the peripheral surface of both rolls 22 and 25 is a crown surface (see FIG. 2), the contact portion between the measured sheet and each roll sandwiched between both rolls 22 and 25 becomes a pinpoint, and the sheet is measured. It is possible to make the unit a narrow range. In addition, the measurement unit can be arbitrarily changed by changing the curvature of the crown surface. Furthermore, in the above-described embodiment, the tips of the rolls 22 and 25 are tapered so that they can enter stably even when the sheet edge is curled. Further, the pressurizing load of the measuring roll / pinch roll 25 can be controlled by changing the spring strength of the spring 27C constituting a part of the lifting mechanism.
[0031]
The movement of the moving table 20A in the arrow direction can be performed by using, for example, a commercially available linear movement actuator (not shown) called an X-axis stage or a pulse stage. In this case, it is preferable that the linear movement actuator can recognize the movement position.
[0032]
FIG. 2 is a block diagram showing electrical components of the sheet thickness measuring apparatus of this embodiment. As shown in FIG. 2, the sheet thickness measuring device of this embodiment includes a stepping motor 21, a magnetic sensor 27, a linear movement actuator for the moving table 20A, and a control device 40 connected to various switches. The control device 40 includes a CPU 41, a motor driver 42, an I / O and counter circuit 43, an A / D converter 44, a memory 45, a keyboard 46, a display 47, and a printer 48. The motor driver 42 is input with a line speed signal sent from a line speed measuring device (not shown) for measuring the line speed of a sheet that is transferred online at a sheet manufacturing site such as a film. It is configured to be.
[0033]
Next, the operation of measuring the sheet thickness online with the sheet thickness measuring apparatus having the above-described configuration will be described.
[0034]
First, as a measurement preparation operation, the moving table 20A is placed on standby at the origin position, and therefore the measurement unit mounted on the moving table 20A is placed on standby at the position shown in FIG. The dirt on the peripheral surfaces of the backup roll 22 and the measurement roll / pinch roll 25 is wiped off. Next, the line speed signal from the sheet production line is received by the motor driver 42, the motor driver 42 is operated under the control of the CPU 41, the stepping motor 21 is driven, and the backup roll 22 and the measurement roll 25 are lined. It is allowed to idle at a speed synchronized with the speed (a state where the sheet to be measured is not between the rolls 22 and 25). The driving pulse of the stepping motor 21 at this time is counted by the counter circuit 43, and the output signal of the magnetic sensor 27 is taken in via the A / D converter 44 at each timing. This signal data is associated with each phase of the measurement roll 25, and one round of the roll is stored in the memory 45. The data stored in the memory 45 in this way indicates changes in the output signal of the magnetic sensor 27 due to fluctuations and distortions of each roll during one rotation of the roll and changes in the magnetic characteristics of the measurement roll. The stored data is set as zero point correction data. That is, this zero point correction data is used to remove measurement errors of the sheet thickness due to the shake and distortion of each roll and the change in the magnetic properties of the measurement roll in the next online measurement operation.
[0035]
After completing such a measurement preparation operation, an online measurement operation is started. While moving the air cylinder 27B and raising the measurement roll / pinch roll 25, the moving table 20A is moved, and the measurement thereon is performed. The unit is moved from the origin position to the on-line measurement position (the position where the sheet S to be measured is traveling in FIG. 1), and the air cylinder 27B is driven again to lower the measurement roll / pinch roll 25. Then, the sheet S that is traveling online is sandwiched between the measurement roll / pinch roll 25 and the backup roll 22, and the online measurement operation is started. It is preferable that the movement of the measurement unit from the origin position to the online measurement position is performed as quickly as possible. This is to prevent measurement errors from being caused by environmental temperature changes or the like.
[0036]
In this online measurement operation, the backup roll 22 and the measurement roll / pinch roll 25 are rotated at a speed synchronized with the traveling speed of the sheet S to be measured that is sandwiched between the rolls and in this state, The driving pulse of the stepping motor 21 is counted by the counter circuit 43 and the output signal of the magnetic sensor 27 is taken in via the A / D converter 44 at each timing. This signal data is stored in the memory 45 as sheet thickness data. This thickness data is zero point correction data stored in the memory 45 in the zero reading operation as the measurement preparation operation as described above, and is corrected in accordance with each phase of the roll to obtain the actual sheet thickness. This is a measured value. That is, the actual sheet thickness measured by the sheet thickness measuring device is obtained by calculating the difference between the thickness data obtained by the online measurement operation and the zero point correction data obtained by the zero reading operation for each position of the roll. It is output by calculating according to the phase.
[0037]
In order to cancel the change in the output of the magnetic sensor as much as possible due to the temperature change in the measurement environment so as not to cause a measurement error, the on-line measurement operation is continuously performed for a certain time, and then the moving table 20A is moved. Return the measurement unit to the offline origin position, perform zero reading again, update the zero point correction data, then move the measurement unit to the online measurement position and repeat the online measurement operation for a fixed time. Such an operation may be repeated.
[0038]
In order to capture the phase of the backup roll, a combination of an asynchronous motor and a rotary encoder may be used. As a method of capturing the displacement of the measurement roll, the displacement of the leaf spring may be captured by a linear gauge, or the strain of the leaf spring may be captured by a strain gauge.
[0039]
The magnetic sensor may be a static magnetic field type or an eddy current type. Further, the support of the measurement roll may be a combination of a linear guide and a spring instead of a leaf spring.
[0040]
The sheet thickness measuring apparatus according to an embodiment of the present invention described with reference to FIGS. 1 and 2 is suitable for measuring a change in thickness of one line of a sheet on-line. When analyzing the quality of the sheet, it is not possible to perform a precise analysis simply by knowing the change in the thickness of the sheet for one line, so not only the thickness change for one line but also the thickness change over the entire surface of the sheet. It has been required to measure. Therefore, according to the present invention, there is also provided a sheet thickness measuring apparatus that can easily and accurately measure the thickness change over the entire surface of the sheet, although it is offline. FIG. 3 is a schematic plan view showing mechanical components of such a sheet thickness measuring apparatus as another embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line AA ′ of FIG. FIG. 5 is a block diagram showing the electrical components of the sheet thickness measuring apparatus in association with the schematic elevation view of the sheet thickness measuring apparatus of FIG.
[0041]
As shown in FIGS. 3, 4, and 5, the sheet thickness measuring apparatus of this embodiment includes a base portion 120, a moving table 120 </ b> A that is installed on the base portion 120 and can move in the direction of the arrow, A stepping motor 121 disposed on the base part 120 and a support unit 122B supported so as to be rotatable by a bearing unit 122A attached and fixed on the base part 120 are attached to the tip of the support rod 122B, and as the support rod 122B rotates. A feed roll / backup roll 122 that can rotate, and a bearing unit 125A provided at the other end of a plate spring 124 that is fixed at one end to a support column 123 erected on the base portion 120, are supported so that one end can be rotated. The support rod 125B is attached to the tip of the support rod 125B. A measuring roll / pinch roll 125 that can rotate and a support beam 127A that is fixedly held at one end on the upper end of the support column 123. The magnetic sensor 127 is mainly provided. In this case, the measurement roll / pinch roll 125 is preferably made of a magnetic material.
[0042]
The leaf spring 124 always exerts an action on the measuring roll / pinch roll 125 in such a direction that the outer circumferential surface of the measuring roll / pinch roll 125 comes into contact with the outer circumferential surface of the feed roll / backup roll 122. Yes.
[0043]
Furthermore, in the sheet thickness measuring apparatus of this embodiment, the spur gear 131 is attached to the intermediate portion of the support rod 122B, and the spur gear 130 is also attached to the support rod 125B. The spur gear 131 and the spur gear 130 can be engaged with each other. On the other hand, a timing pulley 121A is provided on the drive shaft of the stepping motor 121, and a timing pulley 122C is also provided on the support rod 122B. A timing belt is provided between the timing pulley 121A and the timing pulley 122C. 121B is hung. Therefore, when the stepping motor 121 is energized, the support rod 122B is rotationally driven via the timing pulley 121A, the timing belt 121B, and the timing pulley 122C, and the feed roll / backup roll 122 is rotationally driven, and at the same time, the spur gear The support rod 125B is also driven to rotate by the engagement between the spur gear 131 and the spur gear 130, and therefore the measurement roll / pinch roll 125 is also driven to rotate. In this case, the feed roll / backup roll 122 and the measurement roll / pinch roll 125 are driven to rotate synchronously through the engagement of the spur gear 131 and the spur gear 130. At this time, the rolls 122 and 125 operate so as to transfer a sheet as a measurement object inserted between the rolls 122 and 125. Further, the leaf spring 24 allows a shift of the roll 125 upward by the thickness of the sheet between the rolls 122 and 125, but continues to act to press the roll 125 against the roll 122 through the sheet. It can be. At this time, since the upward shift amount of the roll 125 is very small, the normal engagement between the spur gear 130 and the spur gear 131 is not affected.
[0044]
The magnetic sensor 27 senses the upward movement of the measurement roll / pinch roll 125 as described above, and outputs a signal corresponding thereto, so that the feed roll / backup roll 122 and the measurement roll / pinch roll 125 Indicate the thickness of the sandwiched sheet.
[0045]
The movement table 120A can be moved in the direction of the arrow in FIG. 3, for example, by using a commercially available linear movement actuator 120B called an X-axis stage or a pulse stage. In this case, it is preferable that the linear movement actuator can recognize the movement position. In this embodiment, a guide 120C for guiding the movement of the moving table 120A in the arrow direction and supporting the moving table 120A is disposed on the base portion 120.
[0046]
As is well shown in the plan view of FIG. 3, a notch opening 120D is formed at the center of the moving table 120A. The feed roll / backup roll 122 and the measurement roll / pinch roll 125 are It arrange | positions so that the location of the notch opening part 120D may be faced. Furthermore, the moving table 120A acts to push the sheet S as an object to be measured placed on the moving table 120A toward the notch opening 120D during automatic measurement. A pusher 120E and a second pusher 120F are provided.
[0047]
As shown in FIG. 5, the sheet thickness measuring apparatus of this embodiment is connected to the stepping motor 121, the magnetic sensor 127, the linear movement actuator 120B, the first pusher 120E, the second pusher 120F, and various switches. A control device 140 is provided. The control device 140 includes a CPU 141, a motor driver 142, an I / O and counter circuit 143, an A / D converter 144, a memory 145, a keyboard 146, a display 147, and a printer 148.
[0048]
Next, the operation of measuring the thickness change over the entire surface of the sheet offline with the sheet thickness measuring apparatus having the above-described configuration will be described.
[0049]
First, a sheet sampled at a sheet manufacturing site such as a film is prepared as a sheet whose thickness is to be measured. The sheet to be measured is, for example, a strip. Next, as a measurement preparation operation, dirt on the peripheral surfaces of the feed roll / backup roll 122 and the measurement roll / pinch roll 125 is wiped off. Then, the stepping motor 21 is driven to idle the feedback roll / backup roll 122 and the measurement roll / pinch roll 125 at a constant speed (a state in which the sheet to be measured is not between the rolls 22 and 25). In this case, the rotation direction of the feed roll / backup roll 122 and the measurement roll / pinch roll 125 is such that the sheet is transferred to the right in FIG. At this time, the driving pulse of the stepping motor 121 is counted by the counter circuit 143, and the output signal of the magnetic sensor 127 is taken in via the A / D converter 144 at each timing. This signal data is associated with each phase of the measurement roll 125, and one round of the roll is stored in the memory 145. Since the data stored in the memory 145 in this way indicates changes in the output signal of the magnetic sensor 127 due to shake and distortion of each roll during one rotation of the roll and changes in the magnetic characteristics of the measurement roll. The stored data is used as zero point correction data when measurement is performed by moving the sheet to the right by the moving table 120A. In other words, this zero point correction data indicates the sheet thickness due to the shake and distortion of each roll and the change in the magnetic properties of the measurement roll when the thickness is measured by moving the sheet to the right in the next measurement operation. Used to remove measurement errors.
[0050]
Next, the stepping motor 21 is driven in the reverse direction to cause the feedback roll / backup roll 122 and the measurement roll / pinch roll 125 to idle at a constant speed (a state where the sheet to be measured is not between the rolls 22 and 25). In this case, the rotation direction of the feed roll / backup roll 122 and the measurement roll / pinch roll 125 is such that the sheet is transferred to the left in FIG. At this time, the driving pulse of the stepping motor 121 is counted by the counter circuit 143, and the output signal of the magnetic sensor 127 is taken in via the A / D converter 144 at each timing. This signal data is associated with each phase of the measurement roll 125, and one round of the roll is stored in the memory 145. Since the data stored in the memory 145 in this way indicates changes in the output signal of the magnetic sensor 127 due to shake and distortion of each roll during one rotation of the roll and changes in the magnetic characteristics of the measurement roll. The stored data is used as zero point correction data when measurement is performed by moving the sheet to the left by the moving table 120A. In other words, the zero point correction data indicates the sheet thickness due to the shake and distortion of each roll and the change in magnetic properties of the measurement roll when the thickness is measured by moving the sheet to the left in the next measurement operation. Used to remove measurement errors.
[0051]
After completing such a measurement preparation operation, an offline automatic measurement operation is started. The measurement sheet S is placed on the left portion of the cutout opening 120D of the moving table 120A. Then, the feed roll / backup roll 122 and the measurement roll / pinch roll 125 are rotationally driven in such a direction as to move the sheet to the right. The measurement operation is started by lightly pressing the left end of the sheet S with the first pusher 120E so that the right end of the sheet S is inserted between the backup roll 122 and the measurement roll 125. Such a measurement operation is preferably started as quickly as possible. This is to prevent measurement errors from being caused by environmental temperature changes or the like. In a state where the sheet S to be measured is sandwiched between the feed roll / backup roll 122 and the measurement roll / pinch roll 125 and travels in the right direction, the driving pulse of the stepping motor 121 is counted by the counter circuit 143. At each timing, the output signal of the magnetic sensor 127 is taken in via the A / D converter 144. This signal data is stored in the memory 145 as sheet thickness data. This thickness data is zero point correction data for the measurement operation by the rightward running of the sheet stored in the memory 45 in the zero reading operation as the measurement preparation operation as described above, and for each phase of the roll. Corresponding corrections are made to obtain actual sheet thickness measurements. That is, the actual sheet thickness measurement value by this sheet thickness measuring device is the difference between the thickness data obtained by the rightward running measurement operation and the zero point correction data obtained by the rightward running zero reading operation. Is output in accordance with each phase of the roll.
[0052]
In this way, when the thickness of one line of the sheet is measured in the right direction and the sheet S is held at the right side of the notch opening 120D of the moving table 120A, the linear movement actuator 120B is driven to move the moving table 120A forward by a certain amount in the direction of the arrow (see FIG. 3). Then, the feed roll / backup roll 122 and the measurement roll / pinch roll 125 are rotationally driven in such a direction as to move the sheet to the left. The second pusher 120F lightly pushes the right end of the sheet S so that the left end of the sheet S is inserted between the backup roll 122 and the measurement roll 125, thereby starting the measurement operation in the left traveling of the sheet S. Be made. In a state in which the sheet S to be measured is sandwiched between the feed roll / backup roll 122 and the measurement roll / pinch roll 125 and travels to the left, the driving pulse of the stepping motor 121 is counted by the counter circuit 143. At each timing, the output signal of the magnetic sensor 127 is taken in via the A / D converter 144. This signal data is stored in the memory 145 as sheet thickness data. This thickness data is zero point correction data for the measurement operation by the leftward running of the sheet stored in the memory 45 by the zero reading operation as the measurement preparation operation as described above, and for each phase of the roll. Corresponding corrections are made to obtain actual sheet thickness measurements. That is, the actual sheet thickness measurement value by this sheet thickness measuring device is the difference between the thickness data obtained by the leftward running measurement operation and the zero point correction data obtained by the leftward running zero reading operation. Is output in accordance with each phase of the roll.
[0053]
Thus, when the thickness measurement for the next one line of the sheet S is performed in the left direction travel and the sheet S is held in the left side portion of the notch opening 120D of the moving table 120A, The linear movement actuator 120B is driven again to further advance the movement table 120A by a certain amount in the direction of the arrow (see FIG. 3), and then the measurement operation by the rightward traveling of the seat is started. By automatically repeating such an operation, the thickness of the entire sheet S is measured.
[0054]
FIG. 6 is a diagram schematically showing each measurement line on the sheet S as described above, and FIG. 7 is a graph showing an example of a thickness measurement result in one measurement line. It is. In this embodiment, the printer 148 is a color printer, and the thickness measurement value of the sheet S can be printed with dots of different colors or lightness colors depending on the magnitude of the thickness measurement value. . For example, as shown on the right side of the graph display in FIG. 7, when the thickness measurement value is equal to the target value, the thickness measurement value is printed out with yellow dots, and the thickness measurement value is the target value. If the thickness measurement value is smaller than the value and equal to the lower limit value, the thickness measurement value is printed with a blue dot.If the thickness measurement value is greater than the target value and equal to the upper limit value, the thickness measurement value is Print out with red dots, and when the measured thickness is between the target value and the lower limit, print out with a dot in the middle color between yellow and blue depending on the size, When the thickness measurement value is a value between the target value and the upper limit value, control is performed such that printing is performed with dots of an intermediate color between yellow and red depending on the magnitude. By doing this, the thickness measurement value measured by the reciprocating operation as described above is scanned on the printing surface having the same or similar spread as the entire surface of the sheet to be measured in the same manner as the reciprocating operation during the measuring operation. As a result of printing out, a print result as illustrated in FIG. 8 can be obtained. The print result in FIG. 8 can be regarded as a three-dimensional graph of the sheet to be measured in which the thickness change over the entire surface of the sheet to be measured is shown as a color change. This print result expresses the thickness of each position on the entire surface of the sheet to be measured as a color distribution, and makes it easy to visually recognize the thickness image on the entire surface of the sheet.
[0055]
The sheet thickness measuring apparatus according to another embodiment of the present invention described with reference to FIGS. 3 to 8 can easily and accurately measure the thickness change over the entire surface of the sheet, but is limited to off-line measurement. ing. On the other hand, there are various types of non-contact thickness meters that can measure the thickness over the entire surface of the sheet online. However, when measuring a soft sheet, there has been a problem that there is a large difference in absolute value between the measured value measured with a non-contact thickness meter and the measured value measured with a contact-type thickness meter. Therefore, there is a demand for a contact type thickness meter that can measure the thickness over the entire surface of the sheet online. Therefore, according to the present invention, there is also provided a contact-type sheet thickness measuring apparatus that can easily and accurately measure a thickness change over the entire surface of the sheet online. FIG. 9 is a schematic elevational view showing mechanical components of such a sheet thickness measuring apparatus as still another embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along the line AA ′ of FIG. It is. FIG. 11 is an elevation view showing details of the detection unit of the sheet thickness measuring apparatus of FIG. 9, and FIG. 12 is a side view of the detection unit of FIG. FIG. 13 is a block diagram showing the electrical components of the sheet thickness measuring apparatus of this embodiment.
[0056]
As shown in FIGS. 9 to 13, the sheet thickness measuring device of this embodiment is attached to the upper beam 201 and the upper beam 201 and the lower beam 202 that are horizontally provided between the left and right frames. Upper linear rail 203, lower linear rail 204 attached to lower beam 202, upper moving step motor 205 disposed at the right corner of upper beam 201, and lower moving step disposed at the left corner of lower beam 202 A motor 206, an upper right timing pulley 207 disposed at the right corner of the upper beam 201, a lower right timing pulley 208 disposed at the right corner of the lower beam 202, and a drive shaft of the upper moving step motor 205 are attached. The upper left timing pulley 209 and the lower moving step motor 206 are driven. Lower left timing pulley 210 attached to the shaft, upper timing belt 211 hung between upper left timing pulley 209 and upper right timing pulley 207, and between lower left timing pulley 210 and lower right timing pulley 208 A lower timing belt 212 hung on, an upper origin sensor 213 which may be a proximity switch disposed near the left end of the upper linear rail 203, and a lower origin which may be a proximity switch disposed near the left end of the lower linear rail 204 The sensor 214 mainly includes a detection unit 220 that is disposed between the upper linear rail 203 and the lower linear rail 204 and configured to move left and right along the upper linear rail 203 and the lower linear rail 204. Yes.
[0057]
The detection unit 220 is attached to the upper linear rail 203 via a linear bearing 221, and is configured to move along the upper linear rail 203. The detection unit 220 is linear with respect to the lower linear rail 204. And a lower moving table 224 that is mounted via a bearing 223 and configured to move along the lower linear rail 204. As well shown in FIGS. 11 and 12, the detection unit 220 is further attached via an upper leaf spring 227 between the upper turning support device 225 and the upper balance support device 226 provided on the upper moving table 222. And a lower support frame 232 attached via a lower leaf spring 231 between a lower turning support device 229 and a lower balance support device 230 provided on the lower moving table 224. The leaf springs 227 and 231 may be a link mechanism and a spring, and the lower leaf spring 231 is not necessarily provided.
[0058]
The upper turning support device 225 has a turning shaft 225A connected to one end of the upper leaf spring 227, as shown in a partial cross section in FIG. 11, and the turning shaft 225A is interposed via a bearing 225B. It is supported so that it can rotate. The lower turning support device 229 has a rotation shaft 229A supported so as to be able to turn via a bearing in the same configuration as the upper turning support device 225, and one end of the lower leaf spring 231 is arranged in this rotation. It is connected to the moving shaft 229A. As shown well in FIG. 11, the lower balance support device 230 has a structure in which the other end of the connection link 230A connected to one end of the lower support frame 232 is supported by a coil spring 230B and can be balanced and stationary at the center. It is said that. The upper balance support device 226 has a structure similar to that of the lower balance support device 230, and has a structure in which the other end of the connection link 226A connected to one end of the upper support frame 228 is supported by a coil spring and balanced and stationary at the center. It is said that.
[0059]
As well shown in FIG. 11, a measurement roll step motor 233 is attached to one side of the upper support frame 228, and the measurement roll / pinch roll is attached to the drive shaft of the measurement roll step motor 233. 234 is attached, and a magnetic sensor 235 is attached to the other side of the upper support frame 228. Further, a backup roll step motor 236 is attached to one side of the lower support frame 232, and a backup roll 237 is attached to the drive shaft of the backup roll step motor 236. A metal plate 238 is attached to the other side of 232. The measurement roll / pinch roll 234 preferably has a crown as shown in FIG. 11, but the backup roll 237 does not necessarily have a crown. Further, as shown in FIG. 11, the distance between the magnetic sensor 235 and the metal plate 238 is set to a predetermined value L in a state where the measurement roll / pinch roll 234 and the backup roll 237 are in contact with each other. . Further, as shown in FIG. 12, the rotation shafts 225A and 229A are offset by a predetermined distance OS with respect to a line connecting the centers of the measurement roll / pinch roll 234 and the backup roll 237, as described later. It is possible to prevent an unreasonable force from being applied to the sheet S as the measurement object. The magnetic sensor 235 may be an eddy current type or a static magnetic field type.
[0060]
9 and 10, the upper moving table 222 is connected to the lower path of the upper timing belt 211 via the upper connecting bracket 239A, and the upper timing belt 211 is connected to the upper moving step motor. When driven by 205, it is moved along the upper linear rail 203 accordingly. The lower moving table 224 is connected to the upper path of the lower timing belt 212 via the lower connecting bracket 239B. When the lower timing belt 212 is driven by the lower moving step motor 206, the lower moving table 224 is It can be moved along the linear rail 204.
[0061]
Next, with reference to FIG. 13 in particular, the electrical components of the sheet thickness measuring apparatus of this embodiment will be described. As shown in FIG. 13, the sheet thickness measuring apparatus of this embodiment includes a measuring roll step motor 233, a backup roll step motor 236, a magnetic sensor 235, an upper origin sensor 213, a lower origin sensor 214, and an upper movement sensor. A step motor 205, a lower moving step motor 206, and a control device 240 connected to various switches are provided. The control device 240 includes a CPU 241, a motor driver 242 for the measurement roll step motor 233 and the backup roll step motor 236, a motor driver 242A for the upper step motor 205 and the lower step motor 206, and an I / O. And a counter circuit 243, an A / D converter 244, a memory 245, a keyboard 246, a display 247, and a printer 248. The motor driver 242 receives a line speed signal sent from a line speed measuring device (not shown) that measures the line speed of the sheet that is transferred online at the sheet manufacturing site such as a film. It is configured to be.
[0062]
Next, an operation of measuring the thickness over the entire surface of the sheet online with the sheet thickness measuring apparatus having the above-described configuration will be described.
[0063]
First, the basic operation will be described. As the measurement preparation operation, the upper moving step motor 205 and the lower moving step motor 206 are driven to move the upper moving table 222 and the lower moving table 224 to the positions of the origin sensors 213 and 214, thereby causing the detection unit 220 to move. Move to the origin position. FIG. 9 shows a state in which the detection unit 220 is at the origin position in this way. In FIG. 9, the sheet S as the object to be measured is transferred online in a direction perpendicular to the paper surface of FIG. It is supposed to be. The dirt on the peripheral surfaces of the backup roll 237 and the measurement roll / pinch roll 234 is wiped off. Next, the line speed signal from the sheet production line is received by the motor driver 242, and the motor driver 242 is operated under the control of the CPU 241 to drive the measurement roll step motor 233 and the backup roll step motor 236. The measurement roll / pinch roll 234 and the backup roll 237 are caused to idle at a speed synchronized with the line speed (a state where the sheet to be measured is not between the rolls 234 and 237). That is, the measurement roll 234 and the backup roll 237 are rotated in synchronization with each other at a peripheral speed synchronized with the line speed (seat traveling speed).
[0064]
Next, the upper moving step motor 205 and the lower moving step motor 206 are synchronized to start driving, and the upper moving table 222 and the lower moving table 224 are synchronized to the sheet S traveling online ( Move to the right in FIG. Then, the sheet S that is traveling online is sandwiched between the measurement roll / pinch roll 234 and the backup roll 237. The backup roll 237 and the measurement roll / pinch roll 234 are rotated at a speed synchronized with the traveling speed of the sheet S to be measured sandwiched between them, and in this state, the upper moving step motor 205 is rotated. In addition, the counter circuit 243 counts the driving pulses of the step motor 206 for lower movement and the step motor 234 for measurement roll and the step motor 236 for backup roll and the output signal of the magnetic sensor 235 via the A / D converter 244 at each timing. Capture. This signal data is stored in the memory 245 as sheet thickness data. When the measurement of the sheet S is started, the dimension L between the magnetic sensor 235 and the metal plate 238 changes according to the thickness of the sheet S. Since this is proportional to the sheet thickness, the thickness of the sheet S can be known from the change in the output signal of the magnetic sensor 235. As illustrated in FIG. 14, if the output signal of the magnetic sensor 235 is graphed corresponding to each position in the width direction of the sheet S, the thickness distribution of the sheet can be obtained. In this way, by causing the detection unit 220 to reciprocate in the width direction of the sheet S, it is possible to measure the thickness change over the entire surface of the sheet online.
[0065]
Since the sheet thickness measuring apparatus of this embodiment has various configurations that can measure the sheet thickness with high accuracy, the measurement operation by these components will be described below.
[0066]
First of all, since the magnetic sensor 235 is used, it is affected by the surrounding magnetic environment. Therefore, in the sheet thickness measuring apparatus of this embodiment, when there is no sheet S traveling on-line, a measurement operation similar to the basic operation as described above is performed in advance, and the upper moving step motor 205 and the lower portion The counter circuit 243 counts the drive pulse of the moving step motor 206, the measurement roll step motor 234, and the backup roll step motor 236, and takes in the output signal of the magnetic sensor 235 via the A / D converter 244 at each timing. . This signal data is stored in the memory 245 as read error information, that is, zero read data. Then, by adjusting the thickness data of the sheet measured in the basic operation as described above with this zero reading data, it is possible to obtain a high-precision measurement value that is not affected by the surrounding magnetic environment. .
[0067]
Second, the effects of the swivel support devices 225 and 229 as described above will be described. As shown in FIG. 15, when the rolls 233 and 237 move by the arrow B while the sheet S whose thickness is to be measured advances in the direction of arrow A, the direction in which the rolls 233 and 237 advance with respect to the sheet S is the cutting angle θ. Draw the locus of arrow C while holding it. At this time, if there are no swivel support devices 225 and 229 in the support portions of the rolls 233 and 237, a sliding force is generated between the rolls 233 and 237 and the sheet surface. This damages the sheet and at the same time causes vibration of the roll, causing measurement errors. In order to prevent this, a turning support device is provided. The swivel support device is free to rotate without a fixed angle in the absence of a seat. When the zero reading operation is performed when there is no sheet, if the positions of the upper and lower rolls, that is, the positions of the measurement roll 234 and the backup roll 237 are shifted, there is no meaning of zero reading. Therefore, the upper balance support device 226 and the lower balance support device 230 are provided so that the balance is achieved at the center.
[0068]
Third, the reason why the measurement roll step motor 233 and the backup roll step motor 236 are used to drive the measurement roll / pinch roll 234 and the backup roll 237 will be described. It is difficult to manufacture the upper and lower rolls, that is, the measurement roll / pinch roll 234 and the backup roll 237 having a perfect circle. However, even if the upper and lower rolls are not perfect circles, the upper and lower rolls are rotated completely synchronously by the step motors. Can be obtained.
[0069]
Fourth, compensation for temperature characteristics of the magnetic sensor 235 will be described. Sensors are generally accompanied by fluctuations in output values due to heat. Therefore, when the detection unit is reciprocated in the width direction of the sheet in the basic operation as described above, the output signal of the magnetic sensor 235 is increased every time the measurement roll / pinch roll 234 and the backup roll 237 are detached from the sheet. It is stored in the memory 245 as zero point correction data at the time of zero, so that it can be used for correction of the measured thickness value.
[0070]
A modification of the sheet thickness measuring apparatus according to the embodiment described with reference to FIGS. 9 to 15 will be described with reference to FIGS. 16 to 24. In this modification, an existing backup roll can be used instead of the backup roll 237 in the above-described embodiment, and there is an advantage that the cost of the entire apparatus can be reduced.
[0071]
FIG. 16 is a schematic elevation view showing mechanical components of a sheet thickness measuring apparatus as a modified example, and FIG. 17 is a longitudinal sectional view of the sheet thickness measuring apparatus of FIG. 18 is an elevation view showing details of the detection unit of the sheet thickness measuring apparatus of FIG. 16, and FIG. 19 is a side view of the detection unit of FIG. FIG. 20 is a view similar to FIG. 18 showing a modification of the detection unit, and FIG. 21 is a side view of the detection unit of FIG. FIG. 22 is a block diagram showing the electrical components of the sheet thickness measuring apparatus according to this modification.
[0072]
As shown in FIGS. 16 to 19, the sheet thickness measuring apparatus according to this modification is configured to measure the sheet thickness of the embodiment described with reference to FIGS. It has the same structure as the device. The sheet thickness measuring device according to this modification is arranged at the upper beam 301 provided horizontally between the left and right frames, the upper linear rail 303 attached to the upper beam 301, and the left corner of the upper beam 301. Step motor 305 for upper movement, upper right timing pulley 307 disposed at the right corner of part beam 301, upper left timing pulley 309 attached to the drive shaft of upper movement step motor 305, and upper left timing pulley 309 And an upper timing belt 311 hung between the upper right timing pulley 307, an upper origin sensor 313 which may be a proximity switch or the like disposed near the left end of the upper linear rail 303, and the upper linear rail 303. It can be moved left and right along the upper linear rail 303 And a backup roll 337 supported so that each end of the rotation shaft 304 can be rotated by a bearing 302 provided at the lower part of the left and right frames, and a bottom portion of the frame. The idling and measurement drive motor 306 for driving the backup roll 337 via the timing belt 312 and the backup arranged at the bottom of the frame and connected to the rotating shaft of the backup roll 337 via the timing belt 314 A rotary encoder 308 for detecting a roll phase and a rotation origin is mainly provided.
[0073]
The detection unit 320 includes an upper moving table 322 that is attached to the upper linear rail 303 via a linear bearing 321 and configured to move along the upper linear rail 303. As shown well in FIGS. 18 and 19, the detection unit 320 further includes an upper support frame 328 attached to an upper turning support device 325 provided on the upper moving table 322 via an upper leaf spring 327. . The leaf spring 327 may be a link mechanism and a spring.
[0074]
The upper turning support device 325 has a turning shaft 325A connected to one end of the upper leaf spring 327 as shown in a partial cross section in FIG. 18, and this turning shaft 325A is interposed via a bearing 325B. It is supported so that it can rotate.
[0075]
As well shown in FIG. 18, a measurement roll step motor 333 is attached to one side of the upper support frame 328, and the measurement roll and pinch roll is attached to the drive shaft of the measurement roll step motor 333. 334 is attached, and a magnetic sensor 335 is attached to the other side of the upper support frame 328. The measurement roll and pinch roll 334 is preferably crowned as shown in FIG. Further, as shown in FIG. 18, the distance between the magnetic sensor 335 and the peripheral surface of the backup roll 337 is set to a predetermined value L in a state where the measurement roll / pinch roll 334 and the backup roll 337 are in contact with each other. Has been. Further, as shown in FIG. 19, the object to be measured is offset as described later by offsetting the rotation shaft 325A by a predetermined distance OS with respect to a line connecting the centers of the measurement roll / pinch roll 334 and the backup roll 337. It is possible to prevent an excessive force from being applied to the sheet S. The magnetic sensor 335 may be an eddy current type or a static magnetic field type.
[0076]
16 and 17, the upper moving table 322 is connected to the lower path of the upper timing belt 311 via the upper connecting bracket 339A, and the upper timing belt 311 is connected to the upper moving step motor. When driven by 305, it is moved along the upper linear rail 303 accordingly.
[0077]
Next, a modification of the detection unit 320 will be described with reference to FIGS. The configuration of this modification is such that the magnetic sensor 335 is arranged directly above the measurement roll / pinch roll 334 to directly measure the displacement of the measurement roll / pinch roll 334, and the lower end of the support column 335A attached to the upper moving table 322. The configuration of the detection unit 320 described with reference to FIGS. 16 to 19 is the same as the configuration of the detection unit 320 described above with reference to FIGS. 16 to 19 except that the correction magnetic sensor 335 </ b> A is attached to the peripheral surface of the backup roll 337. Accordingly, in FIGS. 20 and 21, the same components are denoted by the same reference numerals and will not be described in further detail. The relationship between the diameter D of the backup roll 337 and the diameter d of the measurement roll / pinch roll 334 is an integral multiple.
[0078]
Next, with reference to FIG. 22 in particular, the electrical components of the sheet thickness measuring device according to this modification will be described. As shown in FIG. 22, the sheet thickness measuring apparatus of this modification includes a measurement roll step motor 333, a backup roll drive motor 306, a backup roll phase detection rotary encoder 308, a magnetic sensor 335, and a correction magnetic sensor. 335A, an upper origin sensor 313, an upper moving step motor 305, and a control device 340 connected to various switches. The control device 340 includes a CPU 341, a motor driver 342 for the measurement roll step motor 333 and the backup roll drive motor 306, a motor driver 342A for the upper movement step motor 305, an I / O and counter circuit. 343, A / D converter 344, memory 345, keyboard 346, display 347, and printer 348. The motor driver 342 receives a line speed signal sent from a line speed measuring device (not shown) that measures the line speed of a sheet that is being transferred online at a sheet manufacturing site such as a film. It is configured to be.
[0079]
Next, an operation of measuring the thickness over the entire surface of the sheet online with the sheet thickness measuring apparatus having the above-described configuration will be described.
[0080]
First, the basic operation will be described. As a measurement preparation operation, the upper moving step motor 305 is driven to move the upper moving table 322 to the position of the origin sensor 313, thereby moving the detection unit 320 to the origin position. FIG. 16 shows a state in which the detection unit 320 is in the origin position in this way. In FIG. 16, the sheet S as the object to be measured is a peripheral surface of the backup roll 337 in a direction perpendicular to the paper surface of FIG. It is assumed that it is transferred online so as to come into contact with. The dirt on the peripheral surfaces of the backup roll 337 and the measurement roll / pinch roll 334 is wiped off. Next, a line speed signal from the sheet production line is received by the motor driver 342, and the motor driver 342 is operated under the control of the CPU 341 to drive the measurement roll step motor 333 and the backup roll drive motor 306. The measurement roll / pinch roll 334 and the backup roll 337 are idled at a speed synchronized with the line speed (a state where the sheet to be measured is not between the rolls 334 and 337). That is, the measurement roll 334 and the backup roll 337 are rotated in synchronization with each other at a peripheral speed synchronized with the line speed (seat traveling speed). At this time, the rotation ratio between the backup roll 337 and the measurement roll 334 has a mechanical configuration that is 1: 1 or an integer multiple of N: 1.
[0081]
Next, the rotation origin of the backup roll 337 is obtained from the origin signal of the rotary encoder 308, and at the same time, the driving of the upper moving step motor 305 is started. The driving speed of the upper moving step motor 305 is determined based on the signal of the rotary encoder 308 coupled to the backup roll 337. When operated in this way, the detection unit 320 scans the circumferential surface of the backup roll 337 spirally as shown in FIG. 23, and always passes through the same place. The output of the magnetic sensor 325 or 325A at this time is stored in the memory 345 and stored as the magnetic characteristics of the backup roll 337. In this way, the peripheral surface of the backup roll is spirally scanned because the thickness change in the width direction of the sheet, that is, the sheet thickness measuring apparatus of this modification is operated in the profile mode for measuring the thickness profile. This is the case.
[0082]
The sheet thickness measuring apparatus according to this modification can be operated not only in the profile mode as described above but also in a trend mode for measuring a thickness change in the longitudinal direction of the sheet, that is, a thickness trend. In order to operate in this trend mode, it is only necessary to measure the thickness while the detection unit 320 is stationary at a desired position in the width direction of the sheet S. By doing so, the width of the sheet S is measured. A thickness trend for one line in the longitudinal direction of the sheet at the directional position can be obtained. After obtaining the thickness trend for one line, the thickness of the detection unit 320 is moved to another position in the width direction of the sheet S and stopped in the same manner, and another thickness is measured. You can get a minute thickness trend. For measurement in such a trend mode, as shown in FIG. 24, the output of the magnetic sensor 325 or 325A is stored in the memory 345 in a circular state with respect to the backup roll 337, and is stored as the magnetic characteristics of the backup roll 337. It is also necessary to keep it. In some cases, since there is a difference in the magnetic sensor output of the rotational speed of the backup roll, it is necessary to change the rotational speed and store the magnetic sensor output in the memory.
[0083]
In the sheet thickness measuring apparatus shown in FIGS. 9 to 15, only the operation in the profile mode for obtaining the thickness profile has been described. However, the sheet thickness measuring apparatus of this embodiment also describes the above-described operation. It can be operated in a trend mode similar to that described above.
[0084]
Next, the upper moving step motor 305 is driven to return the detecting unit 320 to the scanning origin, and at the same time when the roll origin is detected, the upper moving step motor 305 is driven again to move the detecting unit 320 on the backup roll 337. The movement starts toward the sheet S. When the measurement roll / pinch roll 334 of the detection unit 320 is placed on the sheet S, the output signal from the magnetic sensor 335 changes according to the thickness. Naturally, since this signal output includes various error factors such as the magnetic characteristics of the backup roll 337, the true thickness is obtained by adjusting the correction value stored in the memory 345 described above. This is the same as in the previous embodiment.
[0085]
The sheet thickness measuring apparatus of this modification also has various configurations that can measure the sheet thickness with high accuracy, but the description of the measurement operation by these components has been described for the above-described embodiment. This is substantially the same as that described above, and will not be described in detail here.
[0086]
Finally, in this modified example, a description will be given of a point that is devised so as to cope with a low sheet speed. When the sheet speed becomes low, the cutting angle θ shown in FIG. 15 becomes large, and in the configuration of the detection unit shown in FIGS. 18 and 19, the magnetic sensor 335 is greatly deviated from the center of the backup roll 337, and the magnetic sensor can be measured. There is a possibility of deviating from the range. In this case, as in the detection unit shown in FIGS. 20 and 21, a magnetic sensor for measurement 335 is disposed immediately above the measurement roll / pinch roll 334, and the displacement of the measurement roll / pinch roll 334 is directly measured, and the backup roll The thermal expansion error of 337 and the machine frame may be corrected and canceled by the signal output of the correcting magnetic sensor 335A. Therefore, it is necessary to store the output values of both sensors 335 and 335A while driving each roll when there is no sheet and moving the detection unit. Also, the zero check is performed in the absence of the sheet in the same manner as in the above-described embodiment.
[0087]
【The invention's effect】
Even on-line such as a sheet production line, the thickness of the sheet can be measured with higher accuracy by a contact method. In this case, it is possible to measure not only the thickness trend in one line in the longitudinal direction of the sheet but also the thickness profile in the width direction of the sheet. Therefore, since not only the thickness change for one line in the sheet surface but also the thickness change over the entire sheet surface can be measured, analysis of the sheet quality and the like can be performed more precisely.
[0088]
In addition, since the thick and thin image of the entire sheet surface can be easily visually recognized, the application range is widened.
[Brief description of the drawings]
FIG. 1 is a schematic elevational view showing mechanical components of a sheet thickness measuring apparatus as an embodiment of the present invention capable of measuring sheet thickness even on-line.
FIG. 2 is a block diagram showing electrical components of the sheet thickness measuring apparatus of the embodiment of FIG.
FIG. 3 is a schematic plan view showing mechanical components of such a sheet thickness measuring apparatus as another embodiment of the present invention.
4 is a cross-sectional view taken along the line AA ′ of FIG. 3;
FIG. 5 is a block diagram showing electrical components of the sheet thickness measuring apparatus in association with the schematic elevation view of the sheet thickness measuring apparatus of FIG. 3;
6 is a diagram schematically showing each measurement line on a sheet by the apparatus of the embodiment of FIG. 3 for easy understanding.
7 is a graph showing an example of a thickness measurement result in one measurement line on a sheet by the apparatus of the embodiment of FIG. 3; FIG.
FIG. 8 is a diagram exemplifying measurement result printing results by the apparatus of the embodiment of FIG. 3;
FIG. 9 is a schematic elevation view showing mechanical components of a sheet thickness measuring apparatus as still another embodiment of the present invention.
10 is a cross-sectional view taken along the line AA ′ of FIG. 9. FIG.
11 is an elevational view showing details of a detection unit of the sheet thickness measuring apparatus shown in FIG. 9;
12 is a side view of the detection unit of FIG. 11. FIG.
13 is a block diagram showing the electrical components of the sheet thickness measuring apparatus according to the embodiment of FIG.
14 is a diagram illustrating the output signal of the magnetic sensor in the sheet thickness measuring apparatus of FIG. 9 as a graph corresponding to each position in the width direction of the sheet.
15 is a view for explaining a roll cutting angle in the apparatus of FIG. 9; FIG.
FIG. 16 is a schematic elevation view showing mechanical components of a sheet thickness measuring apparatus as a modification of the present invention.
17 is a longitudinal sectional view of the sheet thickness measuring apparatus shown in FIG.
18 is an elevational view showing details of a detection unit of the sheet thickness measuring apparatus shown in FIG. 16. FIG.
FIG. 19 is a side view of the detection unit in FIG. 18;
20 is a view similar to FIG. 18 showing a modification of the detection unit of FIG.
FIG. 21 is a side view of the detection unit in FIG. 20;
FIG. 22 is a block diagram showing an electrical configuration part of a sheet thickness measuring apparatus according to a modified example of FIG.
23 is a view for explaining spiral scanning of a backup roll in the apparatus of FIG.
FIG. 24 is a diagram for explaining a state where the backup roll is in a trend mode in the apparatus of FIG. 16;
[Explanation of symbols]
S sheet
20 Base part
20A moving table
21 Stepping motor
21A Timing pulley
21B Timing belt
22 Backup roll
22A Bearing unit
22B Support rod
22C Timing pulley
23 Support pillar
24 leaf spring
25 Measuring roll and pinch roll
25A Bearing unit
25B Support rod
25C Bearing unit
27 Magnetic sensor
27A Support beam
27B Air cylinder
27C Spring
30 spur gear
31 Spur gear
40 Control device
41 CPU
42 Motor driver
43 I / O and counter circuit
44 A / D converter
45 memory
46 keyboard
47 display
48 printer

Claims (16)

In a sheet thickness measuring device that continuously measures the thickness of the sheet in a production line of a sheet such as a film ,
A measurement roll and pinch roll that can be displaced according to the thickness of the sheet whose thickness is to be measured;
A backup roll for receiving the sheet so as to sandwich the sheet whose thickness is to be measured between the measurement roll and the pinch roll;
Detecting means for detecting a displacement amount of the measurement roll and pinch roll and outputting a signal indicating the displacement amount;
Moving means for repetitively moving the measuring roll and pinch roll, the backup roll and the detecting means between an offline position and an online position of the sheet production line ;
Roll driving means for driving the measurement roll and pinch roll and the backup roll so as to have the same peripheral speed as the online running speed of the sheet whose thickness is to be measured;
Signal processing means for processing an output signal from the detection means to give a measured value of the thickness of the sheet.   The sheet thickness measuring apparatus according to claim 1, further comprising elevating means for elevating and lowering the measurement roll / pinch roll relative to the backup roll.   The sheet thickness measuring apparatus according to claim 1, wherein the roll driving unit includes a synchronizing unit that rotates the measurement roll / pinch roll and the backup roll in synchronization.   The sheet thickness measuring apparatus according to claim 1, wherein the signal processing means includes a memory for storing zero point correction data, and gives a measurement value corrected by the zero point correction data stored in the memory.   In the sheet thickness measuring device for measuring the thickness of the sheet, between the measurement roll and pinch roll that can be displaced according to the thickness of the sheet whose thickness is to be measured, and the measurement roll and pinch roll, A feed roll / backup roll for feeding the sheet so as to sandwich the sheet whose thickness is to be measured, and detection means for detecting a displacement amount of the measurement roll / pinch roll and outputting a signal indicating the displacement amount And table means for placing the sheet whose thickness is to be measured, and the sheet which is placed on the table means and whose thickness is to be measured are the measurement roll / pinch roll and the feed roll / backup roll Sheet extruding means for extruding between the measuring roll and the pinch roll and the feed roll and back-up. A sheet thickness comprising: moving means for moving the sheet in a direction crossing the sheet feeding direction by a roll; and signal processing means for processing an output signal from the detecting means to give a measured value of the thickness of the sheet. Measuring device.   6. The sheet thickness measuring apparatus according to claim 5, wherein the signal processing means includes a memory for storing zero point correction data, and gives a measurement value corrected by the zero point correction data stored in the memory.   The measurement value given by the signal processing means has the same or similar spread as the entire surface of the sheet whose thickness is to be measured, with dots of different colors or lightness depending on the magnitude of the measurement value. The sheet thickness measuring apparatus according to claim 5, further comprising a printing unit that prints out the printed surface.   In a sheet thickness measuring apparatus for measuring the thickness of a sheet, the sheet thickness measuring apparatus includes a detection unit that can be moved in a direction crossing a traveling direction of the sheet whose thickness is to be measured. A measurement roll and pinch roll that can be displaced according to the thickness of the sheet to be measured, and a backup roll that receives the sheet so as to sandwich the sheet whose thickness is to be measured between the measurement roll and pinch roll; Detection means for detecting the displacement amount of the measurement roll / pinch roll and outputting a signal indicating the displacement amount, the measurement roll / pinch roll and the backup roll, and the traveling speed of the sheet whose thickness is to be measured; Roll driving means for driving so as to have the same peripheral speed, and further processing the output signal from the detecting means to give a measured value of the thickness of the sheet Sheet thickness measuring apparatus comprising: a signal processing means.   The sheet thickness measuring apparatus according to claim 8, wherein the roll driving unit includes a synchronizing unit that rotates the measurement roll / pinch roll and the backup roll in synchronization.   The sheet thickness measuring device according to claim 8 or 9, wherein the measurement roll / pinch roll and the backup roll are each supported by a turning support device.   9. The signal processing means includes a memory for storing zero reading data and / or zero correction data, and provides a measurement value corrected by the zero reading data and / or zero correction data stored in the memory. The sheet thickness measuring apparatus according to 9 or 10.   In the sheet thickness measuring apparatus for measuring the thickness of the sheet, a backup roll that receives the sheet whose thickness is to be measured and is rotationally driven so as to have the same peripheral speed as the traveling speed of the sheet, and the thickness A detection unit that can be moved in a direction crossing the traveling direction of the sheet to be measured, the detection unit sandwiching the sheet whose thickness is to be measured between the backup roll and the sheet A measurement roll / pinch roll that can be displaced according to the thickness of the measurement roll, a detection means for detecting a displacement amount of the measurement roll / pinch roll and outputting a signal indicating the displacement amount, and the measurement roll / pinch roll, Roll driving means for driving the sheet so as to have the same peripheral speed as the traveling speed of the sheet whose thickness is to be measured, and further processing an output signal from the detection means Sheet thickness measuring apparatus comprising: a signal processing means for providing a measure of the thickness of the serial sheet.   The sheet thickness measurement apparatus according to claim 12, wherein the detection unit includes a magnetic sensor that outputs a signal corresponding to a distance to the peripheral surface of the backup roll.   The detection means includes a measurement magnetic sensor that outputs a signal according to the distance to the circumferential surface of the measurement roll / pinch roll, and a correction magnetic sensor that outputs a signal according to the distance to the circumferential surface of the backup roll. The sheet | seat thickness measuring apparatus of Claim 12 containing these.   The sheet thickness measuring device according to claim 12, wherein the measuring roll and pinch roll is supported by a turning support device.   13. The signal processing means includes a memory for storing zero reading data and / or zero correction data, and provides a measurement value corrected by the zero reading data and / or zero correction data stored in the memory. The sheet thickness measuring apparatus according to any one of 15.

Images