JPS6146277B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a rotary plate cutting device.

The first conventional rotary corrugated sheet cutting device
To explain with Figures 2 and 3, a is a solid upper knife cylinder, b is a solid lower knife cylinder, and c and d are fixed to the circumferential surfaces of the knife cylinders a and b by bolts e and f. The knives g ₁ and g ₂ are fixed to both ends of the upper knife cylinder a, and the shafts h ₁ ,
h ₂ is the axis fixed to both ends of the lower knife cylinder b, i and j are the frames, k ₁ and k ₂ are the axes g ₁ and g ₂ of the upper knife cylinder a, which can be rotated to the respective frames i and j. Supporting bearings l ₁ and l ₂ are bearings that rotatably support the axes h ₁ and h ₂ of the knife cylinder b to the frames i and j, and m ₁ and m ₂ are fixed to both ends of the upper knife cylinder a. The gears n ₁ and n ₂ are the same gears m 1 and n ₂ fixed to the lower knife cylinder b, respectively.
m is a gear meshed with ₂ , q is a DC motor, p is a gear fixed to the output shaft of the same DC motor q, o is a gear fixed to the shaft h ₁ of the lower knife cylinder b and meshed with the same gear p, When the upper and lower knife cylinders a and b are stopped and the upper and lower knives c and d are at position A in Fig. 3, when a cardboard sheet r is sent between the upper and lower knife cylinders a and b, the DC motor q The rotation of is transmitted to knife cylinder b via gear p and o axis h ₁ ,
It is also transmitted to the upper knife cylinder a through the gears n ₁ , n ₂ , m ₁ , m ₂ , and the upper knife cylinder a,
b synchronously in the direction of the arrow, and the upper and lower knives c,
d are engaged at position B in FIG. 3 to cut the corrugated cardboard sheet r. In addition, in order to cut the cardboard sheet r to a desired length, the upper and lower knife cylinders a and b are rotated at non-uniform speeds during one rotation by a DC motor q and a control device (not shown). . That is, the rotation of the DC motor q is controlled by the control device, and the upper and lower knives c, d are rotated.
is gradually accelerated to the running speed of the cardboard sheet r during the section from position A to position B in Fig. 3,
During the section from position B to position C, the traveling speed is the same as that of the cardboard sheet r, and during the section from position C to position A, it is gradually decelerated and stopped at position A, completing one rotation. There is. Here, in order to cut the corrugated cardboard sheet r to an arbitrary length, the acceleration/deceleration time and the stop time may be controlled by the control device. Since the above operations are repeated, the corrugated paperboard sheet r is continuously cut into arbitrary lengths.

In the rotary corrugated sheet cutting device, the upper and lower knife cylinders a and b are bent due to the cutting load generated when cutting the corrugated sheet r, and a gap is created between the upper and lower knives c and d, which reduces the sharpness of the knives c and d. becomes worse. In order to improve the sharpness of the knives c and d, the diameters of the upper and lower knife cylinders a and b are increased and the bending rigidity is increased.
It is necessary to reduce the deflection of b, but if the diameter of the solid upper and lower knife cylinders a and b is increased to increase the bending rigidity, the inertia GD ² will increase, so it is necessary to increase the horsepower of the DC motor q. Yes, as a result,
There was a problem that power consumption increased.

The present invention addresses the above-mentioned problems, and consists of hollow knife cylinders that rotate in opposite directions by attaching knives to their peripheral surfaces, and a shaft that extends through each hollow part of each knife cylinder. and a plurality of bearings interposed between the respective shafts and the respective knife cylinders, the rotary plate material cutting device is rotatably supported, and its purpose is to cut the knife. An object of the present invention is to provide an improved rotary plate cutting device that can improve the taste without increasing the power consumption of a drive motor.

Next, the rotary plate-shaped material cutting device of the present invention was installed in the fourth and fifth
To explain with an example shown in the figure, 1 is a hollow upper knife cylinder, 2 is a hollow lower knife cylinder, and 3 and 4 are fixed to the circumferential surface of each of the knife cylinders 1 and 2 with bolts 5 and 6. knife, 7,8
is a shaft passing through the hollow part of each of the knife cylinders 1 and 2, 9 and 10 are frames, 11a and 11b are tapered sleeves that firmly fix both ends of the shaft 7 to the frames 9 and 10, and 12a and 12b are the above-mentioned Tapered sleeves 13a, 13b, and 13c, which firmly fix both ends of the shaft 8 to the frames 9 and 10, are interposed between the shaft 7 and the upper knife cylinder 1 to rotatably support the knife cylinder 1. do 3
three bearings 14a, 14b, and 14c are interposed between the shaft 8 and the lower knife cylinder 2 to rotatably support the lower knife cylinder 2; and 15a and 15b are the upper knife cylinders. Gears fixed to both ends of cylinder 1, 16a, 16b
are gears fixed to both sides of the upper knife cylinder 1, 16a and 16b are gears fixed to both ends of the lower cylinder 2 and meshed with the gears 15a and 15b, 17 is a DC motor, and 19 is rotatable to the frame 9. 18 is a coupling that connects the coaxial shaft 19 and the output shaft of the DC motor 17; 20 is a coupling that is fixed to the shaft 19 and connects the gear 16a;
As in the past, the gears meshed with the DC motor 17.
The rotation of the coupling 18 shaft 19 gears 20, 16
a to the lower knife cylinder 2, and the gear 16
a, 16b, 15a, and 15b to the upper knife cylinder 1, and the upper and lower knife cylinders 1 and 2 rotate synchronously at an inconstant speed, so that the corrugated sheet 21 is continuously cut into arbitrary lengths. It is becoming more and more like this.

As described above, the knife cylinders 1 and 2, which rotate in opposite directions, are made hollow by attaching the knives 3 and 4 to their circumferential surfaces, and the knife cylinders 1 and 2 are penetrated through the respective hollow parts. Bearings 13a to 13 interposed between the provided shafts 7 and 8 and the respective knife cylinders 1 and 2
Since the knives 3 and 4 are rotatably supported by the knives 3 and 14c, the sharpness of the knives 3 and 4 can be improved without increasing the power consumption of the DC motor 17. Next, the reason will be explained in detail.

The knife cylinder is deflected by the cutting load generated when cutting the corrugated cardboard sheet, and the amount of deflection depends on the value of the moment of inertia of the knife cylinder. Generally, the deflection calculation of a beam subjected to concentrated load is as follows: y=βW ³ /EI where y: Deflection at the center of the beam β: Supporting conditions for the beam W: Load acting on the beam E: Longitudinal elastic modulus of the beam I: Beam Moment of inertia of area: Performed at the support span of the beam. When this is applied to the calculation of the deflection of the knife cylinder and the deflections of the conventional knife cylinder and the knife cylinder of the present invention are compared, the results are as follows. First, the deflection of the conventional knife cylinder will be explained. Since both ends of the knife cylinder are attached to the frame via bearings, both ends are supported, and β=1/48. Further, if the cutting load W, support span, and longitudinal elastic modulus E are the same values as the knife cylinder of the present invention, and the moment of inertia of the knife cylinder is I ₀ , then the deflection y ₁ of the knife cylinder is y ₁ = 1/48W ³ /EI becomes ₀ . Next, the deflection of the knife cylinder of the present invention will be explained. Since the shaft is firmly fixed to the frame, the support condition β can be regarded as fixed at both ends, and β=1/192. Also, if the moment of inertia of the hollow knife cylinder is I ₁ and the moment of inertia of the shaft is I ₂ , then the moment of inertia of the area I ₀ is I ₀ = I ₁ + I ₂ and the deflection y ₂ of the knife cylinder is , y ₂ =1/192W ³ /EI ₀ , the deflection is reduced to 1/4 of the conventional value, and the sharpness of the knife is improved.

Next, the effect of reducing power consumption will be explained. Generally, the required torque T for acceleration/deceleration motion is T=GD ²・(Ni−N ₀ )/375t(Kg
m) Here, T: Required torque GD ² : Inertia of driven body t: Acceleration/deceleration time (reaching from N ₀ to N ₁
time) N ₀ : Number of revolutions of the driven body before acceleration/deceleration N ₁ : Number of revolutions of the driven body after acceleration/deceleration after t seconds, and if N ₁ =N ₀ =N, power consumption P
becomes P=T・N/974(KW). Here, the power consumption of the conventional cutting device and the power consumption of the cutting device of the present invention are compared as follows. Now, if the acceleration/deceleration time t and the motor rotation speed N when accelerating the knife cylinder from a stopped state to a certain speed are the same between the conventional type and the present invention, the power consumption P of the motor is the same as that of the rotating knife. It depends on the size of the cylinder inertia GD ² . Also inertia
The relationship between GD ² and the moment of inertia I is I _p = I _x + I _y GD ² = 4・r・L・I _p where I _p : Polar moment of inertia I _x : Around the neutral axis x Moment of inertia of area I _y : Moment of inertia of area around the neutral axis y r : Specific weight L : I Expressed by the length of an object with a cross section of _p . Here, the polar moment of inertia I _p of a knife cylinder with a circular cross section is I _x =I _y =I ₀ I _p =2I ₀ . If the outer diameter of the conventional solid knife cylinder is D, the outer diameter of the hollow knife cylinder of the present invention is similarly D, and its inner diameter is d, I _p of the conventional solid knife cylinder is: I _p =x/32D ⁴ , which is designated as I _p1 . Moreover, I _p of the hollow knife cylinder of the present invention is I _p =π/32(D ⁴ −d ⁴ ), which is designated as I _p2 . Furthermore, assuming that the specific weight r and surface length L of the conventional knife cylinder and that of the present invention are the same, the inertia GD ² of the conventional solid knife cylinder is GD ² ₁ =4・r・L・It becomes I _p1 . Moreover, the inertia GD ² ₂ of the hollow knife cylinder of the present invention is GD ² ₂ =4・r・L・I _p2 , and the ratio of both is: It is expressed as As an example, D=250mm, d=180mm
If so, GD ² will be 73% of the conventional one, and the conventional one will be 75KW.
The motor horsepower that used to be required is now only 55KW.

In the embodiment shown in Figs. 4 and 5, both ends of the shafts 7 and 8 are firmly fixed to the frames 9 and 10 to increase the bending rigidity of the knife cylinders 1 and 2, thereby improving the sharpness of the knife. , supported as shown in Figures 6 and 7,
The bending rigidity of the knife cylinders 1 and 2 may be increased. That is, in FIG. 6, frames 9 and 10
The bending rigidity of the knife cylinders 1, 2 is increased by attaching the housings 22, 23 to the outer surfaces of the knife cylinders, and extending the shafts 7, 8 to the housings 22, 23, and supporting the shafts 7, 8 at four points. Increase it,
Another example in which the sharpness of the knife is improved is shown in Fig. 7.
The bending rigidity of the knife cylinders 1 and 2 is increased by applying a load W to both ends of the shafts 7 and 8 using the hydraulic cylinders 24 and 25, and causing the shafts 7 and 8 to flex in the opposite direction by the amount of flexure caused by the cutting load. This is another embodiment in which the sharpness of the knife is improved.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional rotary plate-shaped body switching device, Fig. 2 is a longitudinal cross-sectional side view taken along the arrow line in Fig. 1, Fig. 3 is an explanatory diagram of its operation, and Fig. 4 is the invention of the present invention. FIG. 5 is a longitudinal sectional side view taken along the arrow line in FIG. It is a diagram. 1, 2...knife cylinder, 3, 4...knife,
7, 8...axis, 13a-13c, 14a-14c...
bearing.

Claims (1)

[Claims] 1 Knife cylinders with knives attached to their circumferential surfaces and rotating in opposite directions are made hollow, and each of the knife cylinders is provided with a shaft passing through each hollow part, and between each of the same shafts and each of the knife cylinders. A rotary plate material cutting device characterized in that it is rotatably supported by a plurality of interposed bearings.