JPH0724226Y2 - Slitter knife holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a knife holder used in a slitting machine for cutting a long piece of paper, film, cloth or other sheet-like material into a certain width, The present invention relates to a knife holder that automatically controls the contact pressure between an upper knife and a lower knife.

(Prior Art) A fritter that cuts a long sheet into a certain width is generally called a shear cut type slitter. It rotates in cooperation with a lower knife with a U-shaped cross section and an upper knife that are rotated by a motor. A slitter knife composed of a disc-shaped upper knife and a slitter knife.

The lower knife among the upper and lower knives is fixed in the axial direction, and the upper knife is provided so as to make a lap contact with the lower knife via a spring, but the contact pressure between the upper knife and the lower knife is the sheet shape to be cut. It is indispensable to adjust the material material and thickness, that is, the property of the material to be cut, so as to optimize the life of the knife or the cutting surface.

Further, the contact pressure of the knife needs to be adjusted often by changing the cutting dimension or exchanging the knife due to wear or the like. In the past, this adjustment was made based on the experience and intuition of the individual operator.

(Problems to be solved by the invention) However, it is difficult for the same operator to adjust the contact pressure of the knife, which depends on the intuition of the operator, every time the adjustment is frequently performed by the same operator. However, the contact pressure was inevitably varied, resulting in a great difference in the life and sharpness of the knife.

On the other hand, as a solution to this problem,
There is a slitter knife holder described in Japanese Patent No. 5035.
This holder comprises a slitter knife supported by the holder body, and a slide drive motor for moving the upper knife and the lower knife of the slitter knife along the slide bed, and slides on the slide bed. A strain gauge is attached to the vertical rod that is suspended from the slide base and suspends the holder body, and the contact pressure of the upper and lower knives is detected by the resistance change of the gauge, and the slide drive is performed through the control circuit by the detected signal. This is to automatically adjust the contact pressure of the knife by driving the motor to move the upper knife or the lower knife.

However, in the knife holder, since the strain gauge is attached to the vertical rod that is separated from the holder body, a rubber or the like is interposed between the knife and the vertical rod to cause a time difference in strain detection, and For the same reason, the responsiveness deteriorates and the rod produces only a very slight deflection.Moreover, since this deflection is not always visible only on the side to which the strain gauge is attached because the rod is round, the deflection is taken up by the upper knife. It was extremely difficult to detect it separately from the rotational vibration of the. Then, as the diameter of the knife decreased due to polishing, the distance between the contact point of the knife and the gauge of the rod gradually became shorter.From this, the fulcrum changed and the strain of the gauge was the same as when the knife had a large diameter. do not do.

Further, in the above-mentioned knife holder, since the upper knife is moved integrally with the holder main body, the vertical rod, the slide base, and the motor, there is a drawback that the device becomes large in size. .

The present invention copes with the actual situation as described above, and finds a new structure especially for the mechanism for moving the bearing shaft and the upper knife, so that the contact pressure of the knife can be maintained accurately and easily and automatically. It is an object of the present invention to provide a slitter knife holder that is equipped with a device and is compact and simple.

(Means for Solving the Problems) That is, the feature of the slitter knife holder of the present invention which meets the above-mentioned purpose is that the slitter upper knife is rotatably attached to the tip and the base end is attached to the holder body. A horizontal bearing shaft, slide means for sliding the bearing shaft in the axial direction, slide amount adjusting means for adjusting the slide amount of the sliding means, an adjusting motor for operating the adjusting means, and the bearing shaft are provided. In a slitter knife holder equipped with a contact pressure detector that generates a signal voltage corresponding to the contact pressure of the upper knife and the lower knife, an upper limit indicating voltage circuit, a lower limit indicating voltage circuit, and a motor control circuit, the bearing shaft is A sensing portion formed by thinning the shaft in the vertical direction is provided at an intermediate portion thereof, and the slide means is a piston with the base end of the bearing shaft fixed. Ton and a fluid pressure cylinder into which the piston is fitted, and the slide amount adjusting means is a screw screw that is screwed into the cylinder rear wall and has its tip end abutted against the piston rear end, The adjustment motor is arranged to rotate the screw screw, and the contact pressure detector has:
A strain gauge attached to the sensing portion of the bearing shaft is provided.

(Operation) In the slitter knife holder of the present invention having the above-mentioned configuration, the sensing section provided on the bearing shaft by vertically thinning the shaft is more sensitive to the contact pressure of the upper knife and the lower knife,
In addition, the strain gauges will be bent accurately in the direction of the attached strain gauges, and this deflection will be connected to the adjusting motor through each circuit, and the motor will slide the bearing shaft through the screw screw to reduce the contact pressure between the upper and lower knives. It can always be maintained at a predetermined set value.

Since the upper knife is moved only by sliding the bearing shaft to which the knife is attached, the device itself has a compact and simple structure.

Embodiment Hereinafter, an embodiment of the slitter knife holder of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment of a slitter knife holder of the present invention. In the drawing, (1) shows a slitter upper knife, (2) shows a bearing shaft, and (3) shows a holder body.

The bearing shaft (2) rotatably supports the slitter upper knife (1) at its tip end through a bearing (4), and the base portion of the bearing shaft (2) passes through a piston (16) which will be described later. It is attached to 3).

Further, a sensing portion (5) in which the bearing shaft (2) is vertically thinly formed is provided in an intermediate portion of the bearing shaft (2) provided substantially horizontally, and the sensing portion (5) is provided in the sensing portion (5). Each has a strain gauge (6) attached.

The strain gauge (6) has an amplifier (7) as shown in FIG.
A lower limit indicating voltage circuit (9) including a lower limit voltage comparing circuit (8), an upper limit indicating voltage circuit (11) including an upper limit voltage comparing circuit (10), and an appropriate voltage comparing circuit (12). Are connected to a proper instruction voltage circuit (13), and these supporting voltage circuits (9), (11) and (13) are connected to a motor control circuit (15) to operate or stop the adjusting motor (14). ing. That is, the control circuit (15) compares the signal voltage of the strain gauge (6), which generates a resistance voltage in proportion to the contact pressure of the knife, with the voltage of the set contact pressure, and outputs a lower limit, an upper limit, Proper, each indicating voltage circuit (9), (1
According to the instructions 1) and 13), the adjustment motor (14) is rotated in the direction in which the contact pressure of the knife increases in the case of the lower limit instruction voltage and in the direction of the above contact pressure in the case of the upper limit instruction voltage. When the voltage is applied, the adjusting motor (14) is stopped.

On the other hand, as shown in FIG. 1, the holder body (3) has the above-mentioned piston (16) and a cylinder (17) into which the piston (16) is slidably inserted, and the piston (16) is a cylinder. It is provided so as to be able to retreat to the right in the drawing by air passing through a rod (18) that holds (17) from above.

A return spring (19) for urging the piston (16) forward is provided on the rear side of the piston (16), and the return spring (19) is screwed into the rear wall of the cylinder (17) so that the front end of the return spring (19) contacts the rear end of the piston (16). A screw screw (20) to be abutted is provided. The head of the screw (20) has a spur gear (2
1) is provided, and this spur gear (21) meshes with the spur gear (22) of the adjusting motor (14) via another gear.

In the figure, (23) is a stopper for stopping the piston (16),
Reference numeral (24) is an air cylinder for raising and lowering the holder body (3).

When using the embodiment slitter knife holder having the above configuration, after adjusting the height of the upper knife (1) by the lifting air cylinder (24), the air is transferred from the rod (18) to the cylinder (17). Is sent to move the piston backward, and the upper knife (1) at the tip of the bearing shaft (2) is strongly elastically contacted with the lower knife indicated by the alternate long and short dash line. Due to the contact pressure with the lower knife, the upper knife (1) receives an upward force, and the sensing portion (5) of the bearing shaft (2) flexes like a wobble. The lateral movement amount of the bearing shaft (2) at this time is regulated by the screw screw (20).

Then, due to the deflection of the sensing section (5), the strain gauge (6) emits a signal voltage as described above, and the signal voltage is applied to the lower limit, upper limit, appropriateness, each indicating voltage circuit (9), (11), 1
3) Compare with the preset voltage of the contact pressure of the knife. When the signal voltage of the strain gauge (6) exceeds the upper limit setting value, the upper limit indicating voltage circuit (11), and when the signal voltage falls below the lower limit setting value, the lower limit indicating voltage circuit (9),
Further, when it is appropriate, the appropriate instruction voltage circuit (13) sends an instruction signal to the motor control circuit (15).

Then, the motor control circuit (15) causes the adjusting motor (14) to rotate normally, reversely, and stop in response to the above-mentioned instruction signals. That is, according to the upper limit instruction signal, the adjusting motor (14) is operated so that the screw screw (20) for sliding the bearing shaft (2) having the upper knife back and forth is rotated in the tightening direction to lower the contact pressure, According to the lower limit instruction signal, the adjusting motor (14) is operated to rotate the screw screw (20) in the loosening direction to increase the contact pressure, and according to the proper instruction signal, these are stopped.

As described above, in the slitter knife holder of the present invention, the contact pressure of the knife is set in advance, and thereafter, the upper knife and the lower knife are brought into contact with each other at the above set pressure by their own weight. Even if the contact pressure of the machine changes due to the cause, the contact pressure of the knife can be completely automatically controlled, for example, by immediately returning to the set contact pressure.

Further, in this embodiment, since the contact between the first upper knife and the lower knife is performed by air pressure, even if the upper and lower knives are strongly contacted, the elasticity of the air causes the contact of the knives to be an elastic contact, Damage of the blade is less than that of mechanical contact (however, it goes without saying that other fluid pressure such as hydraulic pressure can be used).

(Effect of the Invention) As described above, in the slitter knife holder of the present invention, the middle portion of the bearing shaft having the upper knife at the tip is thinly provided vertically to form a sensing portion, and the strain gauge is attached to the sensing portion. An adjusting motor that is provided with an instruction and control circuit that is attached to the gauge, fixes the bearing shaft base end to the piston of the fluid pressure cylinder, and operates screw bolts that regulate the retreat of the piston by the circuits. The sensing unit with the bearing shaft and the strain gauge detect the contact pressure of the upper and lower knives directly and sensitively and accurately regardless of the knife diameter. It is possible to operate the adjusting motor and the screw screw to slide the bearing shaft and automatically keep the contact pressure of the knife at the set value.

Since the adjustment of the contact pressure of the knife is performed only by sliding the bearing shaft to which the upper knife is attached, the holder itself has a compact and simple structure, reducing the manufacturing cost, reducing the installation work, and the work. It also has an advantage in effective use in the field, and its practical effect is extremely large.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the slitter knife holder of the present invention, and FIG. 2 is a circuit diagram of the same embodiment. (1) …… Slitting knife, (2) …… Bearing shaft, (3) …… Holder body, (5) …… Sensor,
(6) …… Strain gauge, (9) …… Lower limit indication voltage circuit,
(11) …… Upper limit voltage circuit, (13) …… Proper voltage circuit, (14) …… Adjustment motor, (15) …… Motor control circuit, (16) …… Piston, (17) …… Cylinder , (20)
...... Screw screws.

Claims (1)

[Scope of utility model registration request] 1. A substantially horizontal bearing shaft having a slitter upper knife rotatably attached to its tip end and a base end attached to a holder body, and a slide means for sliding the bearing shaft in its axial direction. A slide amount adjusting means for adjusting the slide amount of the slide means, an adjusting motor for operating the adjusting means, and a contact pressure detector provided on the bearing shaft for generating a signal voltage according to the contact pressure of the upper knife and the lower knife. An upper limit instruction voltage generation circuit that issues an upper limit instruction signal when the signal voltage exceeds an upper limit set value, and a lower limit instruction voltage generation circuit that issues a lower limit instruction signal when the signal voltage falls below a lower limit set value, The adjustment motor is driven by the lower limit instruction signal to move the bearing shaft in the direction in which the contact pressure of the upper and lower knives increases, and the adjustment motor is driven by the upper limit instruction signal. In the slitter knife holder, which comprises a motor control circuit for moving the bearing shaft in a direction in which the contact pressure of the upper and lower knives decreases, and stopping the adjusting motor when the contact pressure is appropriate, the bearing shaft includes: A sensing portion formed by thinning the shaft vertically is provided in an intermediate portion of the sliding means, and the sliding means is composed of a piston to which the bearing shaft base end is fixed and a fluid pressure cylinder into which the piston is fitted. The slide amount adjusting means is a screw screw that is screwed into the cylinder rear wall and has its tip end abutted against the piston rear end, and the adjustment motor is arranged to rotate the screw screw. The contact pressure detector is provided with a strain gauge attached to a sensing portion of the bearing shaft, and a slitter knife holder. Over.