JPH0197594A - Method of detecting contact pressure of shear type slitter - Google Patents

Abstract

PURPOSE: To detect the contact pressure between a top slitter and a bottom slitter quantitatively and precisely by interposing a strain detection member adapted to strain in dependence on the contact pressure between both these slitters, between the top slitter and a housing. CONSTITUTION: Papermaking slitting work is allowed by pressing a top slitter 3 down on a bottom slitter 2 rotating. The reaction force or contact pressure of the bottom slitter 2 relative to the top slitter 3 during this process accordingly strains a strain detection member 22 interposed between the top slitter 3 and a housing 4. When a contact pressure is caused between both these slitters 2 and 3, the position of the strain detection member 22 relative to the housing 4 is held unchanged but that relative to the top slitter 3 changes because of the free axial movement of the top slitter 3. By this principle the strain detection member 22 is allowed to have a distortion, which is detected by a strain gauge 29 and is used for the calculation of the contact pressure between both these slitters 2 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a contact pressure detection method for a shear type slitter, and more particularly to a contact pressure detection method for a shear type slitter that detects contact pressure using a strain gauge.

[Prior Art] A shear type slitter is generally known as one of the slitter for slitting paper manufacturing. As shown in FIG. 3, the shear type slitter 1 includes a bottom slitter 2 that rotates on its own axis, and a top slitter 3 that rotates in contact with the bottom slitter 2 and is movable in the axial direction.
and a housing 4 that supports the top slitter 3.

The bottom slitter 2 has a rotation drive means 5, and is supported by a housing 4 so as to be rotatable around its axis. Then, the top slitter 3 descends from the position 1 of the broken line 6 to the position of the solid line 7 in FIG. 4, contacts the bottom slitter 2, and is rotated, thereby slitting the paper 8.

Conventionally, the contact pressure between the top slitter 3 and the bottom slitter 2 in this slitting operation has been determined based on the operator's intuition. That is, when the operator lowers the top slitter 3 to the position indicated by the solid line 7 and actually slits the paper 8, and reaches a degree of cutting that seems appropriate, the operator fixes the top slitter 3 and proceeds with the slitting operation.

[Problems to be Solved by the Invention] The contact pressure between the two slitters 2 and 3 greatly influences the cutting quality of the paper 8 and the life of the top slitter blade 10. Therefore, it has been desired to devise a method that can quantitatively and accurately express this contact pressure without relying on the operator's intuition.

The present invention was made in consideration of the above circumstances, and aims to eliminate the difference in blade life and cutting quality that occurs between operators, and to properly control the contact pressure between the top slitter and bottom slitter in order to optimize both. The present invention aims to provide a method for detecting contact pressure by accurately detecting reflected distortion.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a bottom slitter that rotates on its own axis, a top slitter that is rotated in contact with the bottom slitter and is movable in the axial direction, and supports the top slitter. In a method for detecting the contact pressure generated between a top slitter and a bottom slitter when paper is slit by a shear type slitter consisting of a housing, a distortion detection member that is distorted according to the contact pressure is placed between the top slitter and the housing. The strain gauge is provided to detect the strain occurring in the strain detection member, and the contact pressure is detected based on the detected strain.

[Operation] The top slitter of the cosier type slitter is supported by the housing so as to be movable in the axial direction and rotatable around the axis. Paper slitting work using a shear type slitter is performed by pressing a top slitter against a rotating bottom slitter. The reaction force, ie, the contact pressure, generated at this time from the bottom slitter to the top slitter distorts the strain detection member provided between the top slitter and the housing.

Specifically, when contact pressure is generated between both slitters, the relative positions of the strain detection member and the housing do not change, but the relative positions of the strain detection member and the top slitter change because the top slitter is freely movable in the axial direction. Due to the cracking, the strain detection member becomes distorted.

Then, the strain occurring in the strain detection member is detected by a strain gauge, and the contact pressure is calculated from the detected strain.

[Example] An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 shows a partial cross section of the top slitter 3, bottom slitter 2, and housing 4 of the shear type slitter 1 shown in FIG.

As shown in the figure, the top slitter 3 has a shaft 12 that is movable in the direction of its center line 11, and a blade that extends in the radial direction of the shaft 12 via a first bearing 13 and has a wedge-shaped cross section at its outer end. a holder 14 for holding the blade 10; a blade 10 held by the holder 14 and rotated in contact with the bottom slitter 2 to perform the slitting operation; It mainly consists of a cylinder 15 provided.

Further, the housing 4 mainly includes a gauging 20 that supports the shaft 12 via a second bearing 18, and an arm member 21 that extends from the gauging 20 and moves the top slitter 3.

Further, a distortion detection member 22 is provided between the top slitter 3 and the housing 4, which is distorted according to the contact pressure between the top slitter 3 and the bottom slitter 2 when the blade 10 contacts the bottom slitter 2. Specifically, its bottom portion is fixed to the shaft 12, and its collar portion is supported by the casing 20 via a spring 19. Further, as shown in FIG. 2, the strain detection member 22 has a circular opening 24 in the center thereof, into which the shaft 12 is inserted, and four notches 25 around the opening 24. are doing. Further, as shown in FIG. 1, the bottom portion 23 is thick at the portion fixed to the shaft 12 and thinner at the outer edge in the radial direction. Further, as shown in FIG. 2, the cylindrical body part 26 also has a slit part 2 in its longitudinal direction.
5, and the four uncut portions 28 of the bottom portion 23 have a structure that is easily distorted due to the structure of the bottom portion 23 and this slit portion 25 described above.

Each of these uncut portions 28 is provided with a strain gauge 29 for detecting strain occurring in these portions. Calculating means and display means (not shown) are connected to the two strain gauges to display the contact pressure based on the signals from the strain gauges 29.

The strain detection member 22 is made of hardened 5CH430, which has good strain sensitivity.

Therefore, when the blade 10 of the top slitter 3 contacts the rotating bottom slitter 2 and rotates, the force acting on the blade 10 is applied to the shaft 12 via the holder 14, and the shaft 12 moves in the right direction in FIG. move slightly.

At this time, the vicinity of the opening 24 of the bottom 23 of the strain detection member 22 is fixed to the shaft 12 and moves in the same manner as the shaft 12 because the plate thickness is large. However, the uncut portion 28 located between the notches 25 does not move like the shaft 12 because the plate thickness is small and the collar 30 receives force in the left direction in the drawing from one spring. Therefore, it will be greatly distorted. And a strain gauge 2 provided in the uncut portion 28
9 detects these distortions, and the distortions are processed by an arithmetic unit (not shown) and displayed by a display means.

Therefore, the contact pressure between the top slitter 3 and the bottom slitter 2 can be expressed quantitatively and accurately. This makes it possible to quantify the life of the blade 10 and the degree of paper cutting, and also to automate the slitting operation.

[3 Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) Since the contact pressure is detected by the amount of strain detected by the strain gauge, the contact pressure can be expressed quantitatively.

(2+ Since the strain detection member is provided between the top slitter and the housing, changes in contact pressure of the top slitter can be detected as changes in strain of the strain detection member, and even slight distortion can be detected accurately.

(3) By being able to accurately detect large distortions, contact pressure can also be detected with high precision.

(4) Therefore, the contact pressure can be adjusted easily.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining the contact pressure method of the shear type slitter according to the present invention, Fig. 2 is a perspective view of the main part of Fig. 1, Fig. 3 is a schematic diagram of the shear type slitter, and Fig. 4 is a left side view of FIG. In the figure, 1 is a shear type slitter, 2 is a bottom slitter, 3 is a top slitter, 4 is a housing, 8 is a papermaker, 22 is a strain detection member, and 29 is a strain gauge. Patent Applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Representative Patent Attorney: Nobuo Kinutani Figure 3

Claims (2)

[Claims] (1) When slitting paper with a shear type slitter consisting of a bottom slitter that rotates, a top slitter that rotates in contact with the top slitter and is movable in the axial direction, and a housing that supports the top slitter, the top slitter In the method of detecting the contact pressure generated between the bottom slitter and the bottom slitter, a strain detection member that is distorted according to the contact pressure is provided between the top slitter and the housing, and the strain occurring in the strain detection member is detected by a strain gauge; A contact pressure detection method for a shear type slitter, characterized in that the contact pressure is detected based on detected distortion. (2) The contact pressure detection method for a shear type slitter according to claim 1, wherein the distortion detection member has a bottomed cylindrical shape, and the bottom and the cylindrical part are notched so as to be easily distorted.