JPH085032B2 - Shear type slitter contact pressure detector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact pressure detection device for a shear type slitter, and more particularly to a contact pressure detection device for a shear type slitter that detects contact pressure with a strain gauge.

[Prior Art] A shear type slitter is generally known as one of the slitters for slitting paper manufacturing. As shown in FIG. 3, the shear type slitter 1 is composed of a bottom slitter 2 which rotates, a top slitter 3 which is rotated in contact with the bottom slitter 2 and which is axially movable, and a housing 4 which supports the top slitter 3.

The bottom slitter 2 has a rotation driving means 5 and is supported by the housing 4 so as to be rotatable around its axis.
Then, the top slitter 3 is lowered from the position of the broken line 6 in FIG. 4 to the position of the solid line 7 and comes into contact with the bottom slitter 2 to be rotated, whereby the papermaking 8 is slit.

Conventionally, the contact pressure between the top slitter 3 and the bottom slitter 2 in this slitting work has been determined by the operator's intuition. That is, the operator lowered the top slitter 3 to the position indicated by the solid line 7 and actually slitted the papermaking machine 8 to reach an appropriate cutting condition, and fixed the top slitter 3 to proceed with the slitting work.

[Problems to be Solved by the Invention] The contact pressure between the slitters 2 and 3 greatly affects the cutting quality of the papermaking 8 and the life of the blade 10 of the top slitter. Therefore, it has been desired to devise a method for expressing this contact pressure quantitatively and accurately without depending on the operator's intuition.

The present invention has been made in consideration of the above circumstances, and corrects the contact pressure between the top slitter and the bottom slitter in order to eliminate the difference in blade life and cutting condition between operators and to optimize both. An object of the present invention is to provide a device for detecting a contact pressure by accurately detecting a reflected strain.

[Means for Solving the Problems] In order to achieve the above object, the present invention supports a bottom slitter that rotates, a top slitter that is in contact with the bottom slitter and that is rotatable in the axial direction, and the top slitter. In a device that detects the contact pressure generated between the top slitter and the bottom slitter when slitting papermaking with a shear type slitter consisting of a housing, a strain detecting member that distorts according to the contact pressure is provided between the top slitter and the housing. , The outside of the strain detection part has a bottomed cylindrical shape, and the bottom part and the cylindrical part are notched so as to easily distort.The strain generated in the strain detection member is detected by the strain gauge, and the detected strain causes the contact pressure. Is detected.

[Operation] The top slitter of the shear type slitter is supported by the housing so as to be movable in the axial direction and rotatable about the axis. The slitting work of paper making by the shear type slitter is performed by pressing the top slitter against the rotating bottom slitter. At this time, the reaction force from the bottom slitter with respect to the top slitter, that is, the contact pressure, distorts the strain detecting member provided between the top slitter and the housing.

Specifically, when a contact pressure is generated between the two slitters, the relative position between the strain detecting member and the housing does not change, but that of the strain detecting member and the top slitter changes because the top slitter is movable in the axial direction. As a result, the strain detecting member is distorted. The strain detecting member is in the shape of a bottomed cylinder, and the bottom and the cylinder are notched so as to easily distort.

Then, the strain generated in the strain detecting member is detected by the strain gauge, and the contact pressure is calculated from the detected strain.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

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

As shown in the figure, the top slitter 3 has a shaft 12 movable in the direction of its center line 11 and a blade having a wedge-shaped cross section extending radially from the shaft 12 via a first bearing 13 and having an outer end. A holder 14 for holding 10, a blade 10 held by the holder 14 and rotated in contact with the bottom slitter 2 for slitting work, and a center line
A bolt 16 and a nut 17 are provided on the shaft 12 at one end of the shaft 12.
It is mainly composed of a cylinder 15 provided through the.

The housing 4 mainly includes a casing 20 that supports the shaft 12 via the second bearing 18, and an arm member 21 that extends from the casing 20 to move the top slitter 3.

A strain detecting member 22 that distorts according to the contact pressure between the top slitter 3 and the bottom slitter 2 when the blade 10 contacts the bottom slitter 2 is provided between the top slitter 3 and the housing 4. Specifically, the bottom portion is fixed to the shaft 12, and the brim portion is supported by the casing 20 via the spring 19. Further, as shown in FIG. 2, the strain detecting member 22 has a circular opening 24 for inserting the shaft 12 at the center of its bottom 23, and four notches 25 around the opening 24. Have Further, as shown in FIG. 1, the plate thickness of the bottom portion 23 is formed such that the portion fixed to the shaft 12 is thick and the radial outer edge is thin. Further, as shown in FIG. 2, the tubular portion 27 also has a slit portion 25 in the longitudinal direction thereof, and the above-mentioned bottom portion 23.
Due to this structure and this slit portion 27, the four uncut portions 28 of the bottom portion 23 are easily distorted.

A strain gauge 29 for detecting the strain generated in each of these non-notched portions 28 is attached. Further, a calculation means and a display means (not shown) for displaying the contact pressure by the signals from the strain gauges 29 are provided so as to be connected to the strain gauges 29.

The strain detecting member 22 is made by quenching SCM430 having good strain sensitivity.

Therefore, when the blade 10 of the top slitter 3 comes into contact with the rotating bottom slitter 2 and is rotated, the force acting on the blade 10 reaches the shaft 12 via the holder 14, and the shaft 12 slightly moves to the right in FIG. Moving. At this time, the vicinity of the opening 24 of the bottom portion 23 of the strain detecting 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 non-notched portion 28 located between the notched portions 25 has a small plate thickness, and
Since the spring 30 receives the force in the left direction of the drawing by the spring 19, it does not move similarly to the shaft 12, and therefore is largely distorted. Then, the strain gauge 29 provided in the non-notched portion 28 detects these strains, and the strains are arithmetically processed by an arithmetic unit (not shown) and displayed by the display means.

Therefore, the contact pressure between the top slitter 3 and the bottom slitter 2 can be quantitatively and accurately expressed. As a result, the service life of the blade 10 and the degree of cutting of paper can be quantified, and the slitting work can be automated.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

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

(2) Since the strain detecting member is provided between the top slitter and the housing, the contact pressure change of the top slitter can be detected as the strain change of the strain detecting member, and even a slight strain can be accurately detected.

(3) Further, since the strain can be accurately detected, the contact pressure can also be detected with high accuracy.

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

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a contact pressure detection device for a shear type slitter according to the present invention, FIG. 2 is a perspective view of an essential part of FIG. 1, FIG. 3 is a schematic view of a shear type slitter, and FIG. FIG. 4 is a left side view of FIG. 3. 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 papermaking, 22 is a strain detecting member, and 29 is a strain gauge.

Claims (2)

[Claims] 1. A bottom slitter which rotates on its axis, and a top slitter which is in contact with the bottom slitter and is rotatable and axially movable.
In a contact pressure detecting device for detecting a contact pressure generated between the top slitter and the bottom slitter when slitting paper by a shear type slitter composed of a housing supporting the top slitter, a strain distorted according to the contact pressure. The strain detecting member is provided between the top slitter and the housing, and the strain detecting member has a bottomed cylindrical shape, and the bottom and the cylinder are notched so as to easily distort, and the strain generated in the strain detecting member. Is detected by a strain gauge, and the contact pressure is detected by the detected strain. 2. The contact pressure detecting device for a shear type slitter according to claim 1, wherein the strain detecting member is formed by quenching SCM430.