JPH09304001A - Measuring device of thickness of paper bundle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for accurately and speedily measuring the thickness of a paper bundle. SOLUTION: A rod 2 is vertically provided on a platform 1. A roller bearing 7 and the moving-scale part 8a of a digital depth gauge 8 are attached to the rod 2. The display part 8b of the digital depth gauge is attached to a measuring- instrument fixing mount 9. On the other hand, this device has the structure that a cam 5 with a rotation axis 11 with a right angle to the axis of the rod 2 is attached to it and turning a handle 6 rotates the cam 5, brings the rim of the cam 5 into contact with the roller bearing 7, pushes up the rod 2 upwards, and maintains a fixed height just before a certain fixed point on the rim. After passing this fixed point of the rim, the rod 2 drops and the lower end face 10 of the rod 2 reaches the upper surface of the platform 1. A paper bundle K whose thickness is to be measured is mounted on the platform 1 just beneath the lower end face 10 of the rod 2, and the thickness is measured from the reading of the digital depth gauge 8 at the time when the lower end face 10 reaches the surface of the paper bundle K.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thickness measuring instrument for a sheet bundle, which is capable of performing accurate and quick measurement by eliminating the individual difference of inspectors in the conventional thickness measurement. is there.

[0002]

2. Description of the Related Art In the papermaking process, the thickness of paper is controlled to be almost constant. Particularly in the case of bookbinding paper, when the paper thickness is different from the standard value, even if the difference between the individual papers is small, the difference in the thickness of one book is accumulated and the error becomes large. further,
Since the shipping box for books has a predetermined size, the problem that the total thickness of the stacked books and the size of the box do not match easily occurs. Therefore, for such paper, not only the management of the paper thickness of one sheet, but also the management of the thickness of the paper bundle is performed by stacking the paper sheets. Conventionally, such thickness measurement of a paper bundle is performed by sampling paper from a roll of paper produced by a paper machine to form a bundle of paper pieces, and an inspector measures the paper bundle with a caliper.

[0003]

In the conventional measuring method using a caliper, the measured value is likely to vary due to individual differences due to the tightening condition of the finger of the inspector, and the measured value varies depending on the inspector. Can't get For example, when a bundle standard thickness of 100 sheets and a bundle standard thickness of 12.2 mm is measured with a caliper, it is 12.0 to 12.4.
A variation of about mm occurs, and the variation is about 34 mm when books are piled up and the height is, for example, 1 m. Further, since the inspector directly measures the thickness of the sheet bundle, there is a drawback that the measurement takes too long. The present invention
It is an object of the present invention to provide a measuring device capable of accurately and quickly measuring the thickness of a sheet bundle by eliminating the disadvantage of the individual difference among inspectors due to the above-mentioned vernier calipers.

[0004]

According to a first aspect of the present invention, a measuring section is composed of a base and a rod which is vertically reciprocated linearly by a cam mechanism on the base, and the measuring unit is provided between the base and a lower end surface of the rod. A thickness measuring instrument for setting a bundle of papers and measuring a thickness of the bundle of papers, wherein the rod is moved from a base to an upper position of a certain height by rotation of a cam having a manual handle, It is a thickness measuring device for a bundle of papers, which has a moving characteristic of dropping from a fixed position.

According to a second aspect of the present invention, the moving scale portion of the electronic digital caliper mechanism is attached to the rod, and the display portion of the electronic digital caliper mechanism is attached to the measuring device fixing base fixed to the base to measure the measured value. Is a thickness measuring instrument for paper bundles according to claim 1, which digitally displays.

According to the third aspect of the present invention, a roller bearing is attached to the rod side of the portion of the cam device where the rod contacts the cam, and the lower end surface of the rod, which is the measuring portion, contacts the lower end surface of the rod. The thickness measuring device for a sheet bundle according to claim 1 or 2, wherein a cemented carbide is attached to the base portion to prevent wear. Claim 4
The present invention is the paper bundle thickness measuring instrument according to any one of claims 1 to 3, wherein a weight is attached to the rod and the pressing force of the paper bundle in the measuring unit is adjusted by adjusting the mass of the weight.

In the cam device used in the present invention, the cam (the driving node of the cam device) is rotated by the rotation of the handle, and the edge of the cam comes into contact with the roller bearing of the rod (the driven node of the cam device). The rod can be lifted upward by gradually pushing up the roller bearing while rotating the bearing. At the position where the peripheral edge farthest from the rotation axis of the cam contacts the roller bearing, the lower end surface of the rod can be pushed up to the highest position. Further, when the cam rotates and a certain peripheral edge (rod drop start position) passes through the roller bearing, the cam rapidly drops due to the weight of the rod and the load of the weight, and the lower end surface contacts the base surface.

That is, the position where the constant peripheral edge of the cam, which is the rod drop start position, comes into contact with the roller bearing is always maintained at a constant height. In this case, the moving scale part of the electronic digital caliper mechanism is attached to the rod, and the dimension indication is 0 point when the lower end surface of the rod is in contact with the base surface, and the height from the base surface increases as the lower end surface of the rod rises. Since the height can be displayed, the height of the lower end surface of the rod can be easily and accurately known.

The present invention is constructed as described above,
To measure the thickness of the stack of paper, rotate the cam and temporarily stop it near the position where the peripheral edge farthest from the rotation axis of the cam comes into contact with the roller bearing mounted on the rod. After a paper bundle for measuring the thickness is placed between and, the cam is rotated to drop the rod on the paper bundle from the cam peripheral edge at the rod drop start position. The thickness of the paper bundle can be easily read from the gauge value of the dimension display when the lower end surface of the rod reaches the surface of the paper bundle. The thickness measuring instrument of the present invention can be used even when the number of sheets is small.
Naturally, it can also be used to measure the thickness of a sheet.

The cylindrical rod is constantly subjected to a constant load downward by the weight and weight of the rod, and the falling start position of the rod is the peripheral edge of the cam and the roller bearing attached to the rod. Since a constant position can always be held at the contact position, the drop distance of the rod is always kept constant, and the pressing force (measured pressure) on the lower end surface of the rod becomes constant. Therefore, the bundle of papers can always measure the thickness under the same conditions. The weight can be omitted by adjusting the mass of the rod, but if the weight is manufactured and attached separately, it is easy to adjust the pressing pressure (measurement pressure) at the measuring part when manufacturing the measuring instrument. Also, when the number of sheets in the sheet bundle changes at the time of measurement, it is possible to change the measurement pressure by replacing only the weight.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. The present invention will be described with reference to FIG.
A cylindrical rod 2 mounted vertically on top is installed. A weight 3 is attached to the upper end of the rod 2, and the lower side is formed in an inverted conical shape. The masses of the rod and the weight may be determined so as to correspond to the thickness measuring device determined by JIS.

A cam 5 having a rotary shaft 11 perpendicular to the shaft center of the rod 2 is attached to a measuring device fixing base 9 fixed to the base 1. A handle 6 is attached to the rotating shaft 11 of the cam 5 and can be rotated by the handle 6. Further, a roller bearing 7 is attached to the rod 2 and has a shaft parallel to the rotation shaft 11 of the cam 5 and is rotatable in contact with the peripheral edge of the cam 5.

Further, a digital depth gauge (Japan Micro) is provided at the outer peripheral position of the rod 2 along the axis.
meter Mfg. Co. Ltd. Manufactured, trade name) 8 is attached to the moving scale portion 8a, and the display portion 8b is attached to the measuring instrument fixing base 9. The digital depth gauge 8 displays 0 points when the lower end surface 10 of the rod 2 is in contact with the surface of the base 1, and can display the height from the surface of the base 1 as the lower end surface 10 rises. Further, the cemented carbide 4 is attached to the lower end of the rod 2, and the cemented carbide plate is also embedded in the contact portion of the base 1 with which the lower end surface 10 of the rod 2 comes into contact. It is possible to prevent wear of the lower end surface 10 and the surface of the base 1.

FIG. 2 shows an example of the cam. The cam 5 has a curved peripheral edge. The cam 5
The peripheral edge P farthest from the rotary shaft 11 gradually approaches the rotary shaft 11 to reach the peripheral edge Q, and is connected to the peripheral edge R which is the closest distance in the step of the peripheral edge Q. There is. Incidentally, cam 5
Is not limited to such a shape, and the point is that the lower end surface 10 of the rod 2 can hold an upper position of a certain height above the surface of the base 1 by the rotation of the cam and the rod can drop. .

When the cam 5 rotates in the direction of the arrow in FIG. 2, the roller bearing 7 lifts the rod 2 to the highest position at the peripheral edge P, and is separated from the roller bearing 7 at the step of the peripheral edge Q. To fall. In other words, the roller bearing 7 causes the rod 2 to drop at the step portion from the peripheral edge Q to the peripheral edge R. In the cam 5 of FIG. 2, since the lower end surface 10 of the rod 2 contacts the base 1 before the roller bearing 7 contacts the peripheral edge R of the cam 5,
The roller bearing 7 does not come into contact with the peripheral edge R of the cam 5.

Next, a method for measuring the thickness of the sheet bundle with the apparatus of the present invention will be described. When the handle 5 is rotated to rotate the cam 5 in the direction of the arrow in FIG. 2, the peripheral edge of the cam 5 comes into contact with the roller bearing 7, and the roller bearing 7 is rotated and pushed by the peripheral edge of the cam 5. The rod 2 is lifted and pushed up by the peripheral edge P to a position of maximum height. In this state, a sheet bundle K for measuring the thickness is placed on the surface of the base 1 just below the lower end surface 10 of the rod 2, and then the handle 6 is rotated to rotate the cam 5.

The cam 5 reaches the peripheral edge Q while rotating the roller bearing 7 and slightly lowering the rod 2 along the edge, and when passing through the peripheral edge Q, the rod 2 is at the step portion.
Falls, and the lower end surface 10 of the rod 2 reaches the stack of paper. In this case, the height at the peripheral edge Q can be accurately read by the digital depth gauge 8. Also, rod 2
When the lower end surface 10 of the sheet contacts the sheet bundle, the numerical value of the digital depth gauge 8 indicates the thickness of the sheet bundle immediately, so that the thickness of the sheet bundle can be easily known.

If a slight straight line portion Z is formed immediately before the peripheral edge Q of the cam 5, the rod 2 can be temporarily stopped at the linear portion Z and then fall from the peripheral edge Q. Accurate measurement can be performed because the force due to the acceleration due to the manual rotation of is eliminated. If the lower end surface 10 of the rod 2 is in contact with the surface of the base 1 and the digital depth gauge 8 does not show 0 points, the reset button of the digital depth gauge 8 can be used to correct it to 0 points. Good.

Further, to subsequently measure the thickness of the paper bundle,
If the lower end surface 10 of the rod 2 is in contact with the surface of the base 1 and the handle 6 is rotated to rotate the cam 5, the cam 5 will start moving from the vicinity of the peripheral edge R closest to the rotation axis 11 at the edge. While contacting the roller bearing 7, the roller bearing 7 is gradually pushed up to push up the rod 2, and once the rotation is stopped at the position of the peripheral edge P, the same operation as above is performed to measure the thickness of the sheet bundle. can do. It should be noted that if an error occurs in the display of the digital depth gauge 8, or if necessary, it is desirable to periodically measure the accuracy with a thickness gauge to confirm the accuracy.

FIG. 3 is a graph of the same sample having a thickness standard of 12.2 mm taken 300 mm in the width direction of the paper machine and measured with a caliper and a measuring instrument of the present invention at a pitch of 20 mm. In FIG. 3, the solid line + indicates the measured value according to the present invention.
The solid line in □ is the measured value by calipers.

As is apparent from FIG. 3, when measured with the measuring device of the present invention, the range of variation in measured values is 0.12 m.
m is 0.3m when measured with calipers
m. It is speculated that this difference is due to the fact that, in the case of calipers, the force for pressing the sheet bundle during measurement tends to fluctuate, whereas the measuring device of the present invention has a constant force for pressing. Regarding the measurement time, in the case of 96 sheets of paper bundle and 4 measurement points, it took about 5 minutes for sample collection in any case, but about 5-10 seconds for measurement with the measuring instrument of the present invention. The caliper required about 3 to 5 minutes, while the workability was remarkably improved.

[0023]

As described above, according to the present invention, the cam (the driving node of the cam device) is rotated by the rotation of the handle, and the rod having a constant load (the driven node of the cam device) is dropped from a certain height to remove the paper bundle. Since the thickness can be measured, the force (measurement pressure) that presses the sheet bundle during measurement becomes constant, and the measurement error due to the distortion of the sheet bundle can be reduced. Therefore, it is possible to eliminate variations in the measured values when the conventional calipers are used for measurement, and it is possible to quickly obtain accurate numerical values.

Further, according to the present invention, unlike the conventional measurement of calipers by an inspector, since the measurement can be performed by a simple work of rotating the handle, the measurement time can be greatly reduced and the workability can be greatly improved. it can. Further, since the present invention rotates a cam to drop a rod having a constant load from a constant height, it can be manually operated, and requires no power such as air and electric power, and is accurate and quick. The thickness of the paper bundle can be measured.

Further, the result of the paper bundle thickness measurement can be promptly fed back to the increase or decrease of the basis weight of the paper machine, and the accuracy of the paper bundle thickness measurement can be improved so that the over action (actually, the paper thickness can be reduced). However, it is possible to prevent the action of correcting the paper thickness) from the measurement result that the paper thickness has changed, and it is possible to contribute to the improvement of the efficiency of the papermaking operation.

[Brief description of drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is a plan view of an example of a cam.

FIG. 3 is a comparison data of the measured value according to the present invention and the measured value by calipers.

[Explanation of symbols]

 1: Base 2: Rod 3: Weight 4: Cemented carbide 5: Cam 6: Handle 7: Roller bearing 8: Digital depth gauge 8a: Moving scale part of digital depth gauge 8b: Digital depth gauge display part 9: Measuring instrument Fixed base 10: Lower end surface of rod 11: Rotational axis of cam P: Peripheral edge farthest from rotational axis of cam Q: Peripheral edge with step R: Peripheral edge closest to rotational axis of cam Z: Circular Edge straight line K: Paper bundle

Claims (4)

[Claims] 1. The thickness of a stack of papers, wherein the measuring unit comprises a base and a rod that reciprocates up and down linearly by a cam mechanism on the base, and a stack of papers is set between the base and the lower end surface of the rod. A thickness measuring device for measuring the movement of the rod, wherein the rod has a moving characteristic of moving from a base to an upper position of a certain height by the rotation of a cam having a manual handle and then dropping from the certain position. A paper bundle thickness measuring device. 2. The measured value is digitally displayed by attaching a moving scale portion of an electronic digital caliper mechanism to the rod and further attaching a display portion of the electronic digital caliper mechanism to a measuring device fixing base fixed to a base. The thickness measuring device for a sheet bundle according to claim 1, wherein 3. A roller bearing is attached to the rod side of the portion where the rod contacts the cam, and a cemented carbide is formed on the base portion where the lower end surface of the rod which is the measuring portion contacts the lower end surface of the rod. The sheet bundle thickness measuring instrument according to claim 1 or 2, which is attached. 4. The paper bundle according to claim 1, wherein a weight is attached to the rod and the weight of the weight is adjusted to adjust the pressing force of the paper bundle in the measuring unit. Thickness measuring instrument.