JPS625757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a twin-blade sheet cutting device suitable for use in cutting multiple layers of sheet materials such as synthetic resin flexible sheets, paperboard, and high-quality paper.

Conventional cutting devices of this type have mainly used the so-called shear-cut method, which uses a pair of upper and lower disc-shaped rotating blades, but since this device usually rotates in tandem, there is no space between the upper and lower rotating blades. Slippage occurs, and during rotation, deflection causes eccentric runout and surface runout, resulting in poor cutting quality, resulting in a loss of precision, making it difficult to make clean cuts, and reducing production efficiency due to cutting irregularities. was inviting. Furthermore, this phenomenon has recently been noticeable in the cutting of soft synthetic resin sheets, and efforts have been made to develop cutting devices to improve this phenomenon.

In view of the actual situation of conventional sheet cutting, the present invention aims to overcome the problem and provide an effective cutting device. The blades are both directly driven by variable speed motors, making it possible to control the speed of the rotary blade depending on the cutting conditions, and making it easy to adjust the position of the cutting point due to wear on both the upper and lower rotary blades. Each configuration is the main feature.

Hereinafter, specific aspects thereof will be further described based on embodiments shown in the accompanying drawings.

However, it goes without saying that the present invention is not limited to such illustrated embodiments, and that various design changes can be made without departing from the above-mentioned objectives.

1 and 2 are a front view and a side view of the cutting device of the present invention, and in the figures, 1 is a base of the cutting device of the present invention, which is fitted into a guide rail 2, and a sliding handle 3.
By operating the main body of the cutting device, the main body of the cutting device can be moved to an appropriate position and fixed.

On the other hand, reference numerals 4 and 5 denote an upper rotary blade and a lower rotary blade, which are the characteristics of the present invention. These two blades 4 and 5 are integrated with support members 6 and 13, respectively, and each has its own separate feedback circuit, which allows speed fluctuations. The shafts of variable speed motors 8, 15 with low speeds are fixed by bolts 7, 14 so that they can rotate, and the motors 8, 15 are directly driven to control the cutting speed of the sheet material to be cut. The speed control method is used to always maintain a constant peripheral speed of the rotary blades 4 and 5.

The upper and lower rotary blades 4 and 5 are both configured to have the same shape, and are both formed in a shape that slopes sharply from one side toward the other side in the thickness direction of the blade. The blades are disposed so that their sharp end surfaces are circumscribed and located in the same plane between them, and the thicker portions of the blades are located on opposite sides with the plane as a boundary.

Of course, the shape of the rotary blade is basically the shape shown in the drawings, but the angle and shape of the blade edge can be appropriately designed based on the material to be cut, and the optimal angle and shape are selected respectively.

In particular, as the lower rotary blade, a disc blade with a U-shaped cross section, such as the conventional shear cut type, can be used, but from the viewpoint of production and management of the rotary blade, it is preferable to use the same shape.

The position of the lower rotary blade 5 can be adjusted by means of a frame 16 extending upward from the base 1 through its elongated hole 18 and a tightening bolt 17. When adjusting the position of the cutting point, the tightening bolt 17 is loosened and the vertical position adjusting screw 19 is used to always set the cutting point at a predetermined position.

On the other hand, the frame 16 supports the sheet platform 20 above the lower rotary blade 5, and further extends upward to be connected to the holding frame of the upper rotary blade 4.

And, by this upper frame, the motor 8
An upper rotary blade 4 attached to a rotating shaft is supported, and the upper rotary blade 4 also has an adjustment knob 10 and a tightening knob for adjusting the meshing position with the lower rotary blade as the blade wears. A bolt 12 is provided, loosen the tightening bolt 12 as appropriate, and adjust the adjustment knob 10.
Adjustments are now being made based on On top of that,
Furthermore, the lower rotary blade 5 is attached to the frame of this upper rotary blade.
A tightening bolt 11 and an adjustment knob 9 are provided for adjusting the contact pressure of the upper rotary blade 4 against the
The contact pressure can be adjusted by loosening the tightening bolt 11 and operating the adjustment knob 9. In this case, a cushion spring mechanism (not shown) is built into the support member 6 to absorb the contact pressure caused by the overlap. Of course, this adjustment mechanism may be provided not only on the upper rotary blade side but also on the lower rotary blade side, or, although it is more complicated, it can also be provided on both sides of the upper and lower rotary blades.

In the figure, 21 is a regulating plate for the feed sheet S.

The device of the present invention has the configuration as described above,
Now, when placing the material S to be cut on the mounting table 20 and cutting it using the device of the present invention, first, the upper and lower rotary blades are each tightened in accordance with the type of the material S to be cut. Loosen the bolts 12 and 17 and adjust the adjustment knob 1.
0 or adjusting screw 19 to set the position, and furthermore, adjust the contact pressure of both rotating blades to an appropriate pressure by operating the tightening bolt 11 and adjustment knob 9 in the same way,
Thereafter, the variable speed motors 8 and 15 are driven to feed and maintain the material S to be cut, such as synthetic resin soft film, paperboard, and high-quality paper, and the cutting speed is always kept constant at a constant rate. Cut the circumferential speed from a predetermined point.

In this case, the number of rotations of the lower rotary blade 5 is set slightly higher than the feeding speed of the sheet to be fed, for example, by about 0.5 to 8%, and the number of rotations of the upper rotary blade 4 is further set higher than the number of rotations of the lower rotary blade 5. If the size is slightly larger, very effective and good cutting can be performed.

If the rotary blades 4 and 5 become worn as cutting progresses, loosen the tightening bolts 12 and 17 at any time.
Adjustment is made by rotating the adjustment knob 10 or adjustment screw 19, and the position is again located at the correct joining position.

Furthermore, in order to make the wear of the upper and lower rotary blades as uniform as possible, the upper and lower rotary blades 4 and 5 may be replaced with each other.

For this purpose, it is extremely advantageous that the upper and lower rotary blades have the same shape.

Thus, by using the apparatus of the present invention, the material to be cut can be cut into sheets with a beautiful finish in terms of appearance.

As described above, in the device of the present invention, the upper and lower rotary blades have the same blade shape, and the shape is tilted sharply from one side toward the other side in the blade thickness direction, and the arrangement is The sharp end faces are located on the same plane and the blade thickness directions are located in opposite directions with respect to the same plane, so that the sharp inclined surfaces of both the upper and lower rotary blades are aligned in a straight line. They are located on a flat surface, maintain balance with each other, and contact the material to be cut, making it possible to reliably join the cutting edge surfaces without causing eccentric wobbling, etc., and cut with a beautiful cutting surface, unlike the conventional shear cut method. It has an excellent cutting effect that produces clean cuts that are difficult to make, and both of these rotating blades can be used in the same shape, making them highly compatible and easy to manufacture.Furthermore, each blade is driven by a separate variable speed motor. As a result, there is no mutual slippage, and in addition, the cutting efficiency is improved by ensuring a circumferential speed that matches the cutting speed of the material being cut.In addition, by using the tightening bolt, adjustment screw, adjustment knob, etc. It is an extremely practical twin-blade type sheet cutting device as it has various features such as ensuring that the position of the rotary blade is set reliably.

The device of the present invention allows easy selection of the angle and shape of the cutting edge, and is particularly useful for cutting soft synthetic resin sheets and various paper sheets.

[Brief explanation of the drawing]

FIG. 1 is a front view of the cutting device of the present invention, and FIG. 2 is a side view of the same. 4... Upper rotating blade, 5... Lower rotating blade, 6,1
3... Rotating blade support member, 7, 14... Rotating blade mounting bolt, 8, 15... Variable speed motor, 9, 10
... Adjustment knob, 11, 12, 17 ... Tightening bolt, 19 ... Vertical position adjustment screw.

Claims (1)

[Scope of Claims] 1. In an apparatus that includes a pair of upper and lower rotary blades arranged circumscribed and cuts a fed sheet by rotation of the rotary blades, the outer periphery of the pair of rotary blades is Consisting of the same blade shape that is sloped in a sharp shape from one side to the other side, the sharp side end surface of the blade configuration is located in the same plane above and below,
The blades are arranged so that their thickness directions are opposite to each other with respect to the plane, and the speed of each rotary blade can be adjusted individually by direct drive, and at least one of the rotary blades is provided with a mechanism to prevent wear of the rotary blade. A sheet cutting device characterized by being provided with an accompanying cutting position adjustment mechanism. 2. The sheet cutting device according to claim 1, wherein the contact pressure of the upper rotary blade with respect to the lower rotary blade can be adjusted. 3. Claims 1 or 2, wherein a cushion spring mechanism is incorporated in the support member of the upper rotary blade, and buffering of the contact pressure between the upper and lower rotary blades is absorbed by the cushion spring mechanism. Sheet cutting device as described in section. 4. Claim 1, wherein the rotational speed of the lower rotary blade is higher than the sheet feeding speed, and the rotational speed of the upper rotary blade is even higher than that of the lower rotary blade.
The sheet cutting device according to item 1, 2 or 3.