JPS5871096A - Rotary cutter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary cutter that can be applied to a cutting device for plate materials such as corrugated cardboard sheets, various papers, and thin metal plates.

To explain the conventional rotary corrugated sheet cutting device with reference to FIGS. 1 and 2, a is an upper knife cylinder, b is a lower knife cylinder, and c and d are poles on the circumferential surface of each of the knife cylinders a and b. ) Knife fixed by e and f 'g++g2
are shafts fixed to both ends of the upper knife cylinder a, hl,
h2 is a shaft 1 fixed to both ends of the lower knife cylinder b;
゜j is a frame, kl, 4 is a bearing that rotatably supports the axis gsygz of the upper knife cylinder a on each of the frames t+j; 11. □ is the lower knife cylinder b
The axis hs+h2 of the frame 1. This is a bearing that rotatably supports the j.

Also, m@Hf112 is the gear fixed to both ends of the upper knife cylinder a, %nl Hn2 is the gear fixed to the lower knife cylinder z
' A gear, q, fixed to b and meshing with the gears m, , m.
is a motor, usually a DC motor. Moreover, p is a gear connected to the output shaft of the same %-taq, and 0 is a gear fixed to the shaft h1 of the lower knife cylinder b and meshed with the same gear p.

Now, in the above-mentioned apparatus, the material to be cut 1, such as a cardboard sheet r, passes between the upper knife cylinder a and the lower knife cylinder b, and the cutting is performed as shown in FIG.

o1 axis, to the lower knife cylinder b via the gear nl
+ n2 r ms r mt are transmitted to the upper knife cylinder a, and the cut is caused by the contact between the cutting edges of the upper knife C fixed to the upper knife cylinder a and the lower knife d fixed to the lower knife cylinder b. Material r is shear cut.

``□ However, in the conventional device mentioned above, as can be easily inferred from the cutting method of the scissors, both knives cut the material while crushing it. This pattern is modeled in Fig. 3. The material to be cut C is crushed and separated at the contact area between knife A and knife B.Therefore, this method is a so-called push cut, and knife A and knife B1
does not slide relative to each other in the longitudinal direction.

When cutting something, it is a daily experience that it is easier to cut by pulling rather than pushing, and the cut surface is sharp and clean. Therefore, when cutting with this method, the cut surface will not be sharp unless the structure of the knife and the position of the upper and lower knives are properly designed, and since a large cutting force is required, the thickness of the material to be cut is large. When cutting materials with high cutting resistance, such as materials, it is necessary to increase the motor power, and there are disadvantages such as damage to the blade.

The present invention was proposed in order to eliminate the above-mentioned conventional drawbacks, and by making at least one of a pair of knives (cylinders) move back and forth 5 times in an axial direction, the cutting quality can be improved and cutting resistance can be improved. It is an object of the present invention to provide a rotary cutter that can reduce the rigidity of the device and save power by reducing the amount of force required.In the conventional device shown in FIG. A method was adopted in which the knives C and a fixed to the upper and lower cylinders were brought into contact with each other by rotating the knives C and B in opposite directions to crush and cut the material passing between the two cylinders.

In the present invention, both cylinders are rotated in the same manner as described above, and one or both cylinders are rotated in the axial direction c, E-
Therefore, we aim to provide a rotary cutter in which the upper and lower knives are slid relative to each other to cut the material to be cut while moving the knife.The principle is shown in a model in Fig. 7. Shown in detail.

That is, the knife A2 and the knife B2 move relative to each other while being in contact with each other at their respective cutting edge portions, and the material to be cut C is cut at the cutting portion while being pulled by the knife A2. Here, the reason why the sharpness is good when using this method will be explained below.

We also experience in our daily life that when you use a knife to cut something, it cuts better if you pull it while cutting.

This is because when cutting while pulling, the cross section taken along the line where the blade moves when cutting into something becomes more acute than when it is not pulled by 1.0 The knife is shown in Figure S. When the knife is not pulled, that is, when pushing, the line along which the knife moves while cutting the object constitutes ΔPIRIQI, and when cutting while pulling the knife, it becomes △P2R2Q2, so the angle at which the knife cuts into the object is LP+R+Qt.
On the other hand, it becomes L Pt R2Q2 and gradually becomes an acute angle. It is a natural theory that sharp edges cut better than obtuse edges, which explains the sharpness of cutting while pulling.

Now, in order to apply the above principle to a rotary cutting device,
The lower knife is not moved axially and the upper knife is moved 0 or the upper knife is not moved axially and the lower knife is moved. Alternatively, move the upper knife and the lower knife in opposite directions. You can choose one of the following.

Further, both knife cylinders may be rotated in the conventional manner, and the structure is such that the knives move as the two knives come into contact with each other. Therefore, it is sufficient to perform seven reciprocating motions for one rotation of the cylinder.

As the cutting force is low and disappears, there is no problem in reducing the rigidity of the device itself. Not only does it contribute to cost reduction, but since both knives slide in contact with each other, self-sharpening can be expected. The embodiment of the present invention will be explained below with reference to the drawings. Figure 6 shows the device of the first embodiment of the present invention. is the upper knife cylinder, (g) is the lower knife cylinder, (,7
) (4') is a knife fixed to the circumferential surface of each knife cylinder, (S) is a shaft inserted into the hollow part of the upper knife cylinder (1), and (A) (7) is the lower knife. Cylinder (2
) is the shaft fixed at both ends of the (g) (9) is the frame, (10) (//) is the upper knife cylinder <
The slide bearing that enables the shaft (S) of i) to reciprocate, (/2) (/3) rotates the shaft (A) (?) of the lower knife cylinder (k) to the frame (g) (9) Bearing that can support (/ is the upper knife cylinder (1)
) is rotatable around the axis (j), Cl
3) (16) is a gear fixed to both ends of the upper knife cylinder (1), supported by a shaft (j) with a bearing (not shown),
0(/?) is a gear that can rotate around the axis (j).
) (1g) is a gear fixed to both ends of the lower knife cylinder (c) and meshes with the gear (/j) (lA), (19) is the motor, and (〃) is connected to the output shaft of the motor (19). The gear (-7) is fixed to the shaft (6) of the lower knife cylinder (2) and the gear 1 (n) that meshes with the gear (〃) is connected to the motor (l).
(J) is the shaft, (3) is the bevel gear fixed to the coaxial shaft (2) and meshes with the bevel gear (22), (n) is the bevel gear connected to the output shaft of the shaft (J). A disk fixed to the upper end, (
:lA) is a connecting rod whose one end is fixed to the disk (C) via a pin (27), and the other end is connected to the shaft (5) via a pin (3) and a fixing jig (29). .

Next, the effect will be explained. In the above device, when a material to be cut, such as one-corrugated cardboard, is installed between the upper knife cylinder (1) and the lower knife cylinder (2), the rotational force of the motor (/9) is applied to the gear (J) ( , 2/) and the shaft (6) to the lower knife cylinder (k), and the lower knife cylinder (k) rotates. At the same time, the driving force is a gear [17]
The driving force is transmitted from the gear to the gear (/, !1), and from the gear (1g) to the gear (/6), causing the upper knife cylinder (1) to rotate in the opposite direction to the lower knife cylinder (k). On the other hand, the rotational force of the motor (19) is the bevel gear (-1, 2)
Rotate the axis (2!I) through (,2-7) and rotate the axis (,
The disc (O) fixed to the disc (24') rotates, and the connecting rod (I) fixed to the disc (O) with a pin (core) rotates around the pin (27) as a fulcrum. The connecting rod (
A shaft (&) fixed to a roller (roller) via a pin (c) and a fixing jig (c) reciprocates in the axial direction.

When the shaft (&) reciprocates, the upper knife cylinder (1) also reciprocates accordingly, but as mentioned above, the upper knife cylinder (1) also rotates at the same time via the bearing. Because the lower knife cylinder (K) does not reciprocate and the upper knife cylinder (1) reciprocates in the axial direction, the gear (17) (/S) is
The width is wider than that of the same gear CI.
(lA) slides while rotating.Also, the rotation of the upper and lower knife cylinders (1) (, 2) and the timing of the reciprocating movement must be synchronized, and the upper knife (3) and lower knife
How to pull off the material to be cut at the same time as (lI) comes into contact with it□
The process of moving the upper knife (3) in the axial direction, then moving back in the axial direction after the cutting is completed and the upper and lower knives (4') are removed may be repeated.

FIG. 7 shows another embodiment in which the upper knife cylinder (1) is reciprocated. In this embodiment, the end of the shaft (1) is
No. 3 is fixed, and one end of the rod [No. 3] has a groove (31) fitted into a groove (31) carved in the shaft (6), which has an approximately elliptical shape, and the circumferential temperature 〇Now, in Figure 7, when the shaft (6) rotates, the groove (3/)
The rod (3) fitted in moves horizontally, and the axis (j
) reciprocates and performs the same cutting action as in the first embodiment. - Furthermore, in each of the above embodiments, the lower knife cylinder does not reciprocate, and only the upper knife cylinder reciprocates.

Although one example of the cutting method of the present invention is not shown, contrary to the above, the lower knife cylinder may be moved reciprocally without reciprocating the upper knife cylinder, or the upper knife cylinder and the lower knife cylinder may be moved relative to each other. It is also possible to adopt a structure in which the upper and lower knives are slid relative to each other, such as a structure in which the upper and lower knives are cut while approaching each other.Since the present invention is constructed as described in detail above, 1 the material to be cut is cut while being pulled by the knife. The method can be realized as a rotary cutting device.

Therefore, according to the present invention, a very sharp cutting edge can be guaranteed, there is no problem even if the rigidity of the device itself is reduced, and the cutting edge can be prevented from becoming flat and the cutting edge can always be kept sharp. It has many excellent effects.

[Brief explanation of the drawing]

FIG. 7 is a side sectional view of a conventional rotary corrugated sheet cutting device, FIG. 2 is a front sectional view of the main parts in FIG. 7 and 9 are perspective views for explaining the state, and FIG. 9 is a perspective view showing a model of a state in which a material to be cut is cut by a knife of a rotary cutter according to an embodiment of the present invention. SW is an explanatory view of the cutting angle by the knife; FIG. 6 is a side sectional view of a rotary cutter showing a first embodiment of the present invention, and FIG. 7 is a side sectional view of a rotary cutter showing a first embodiment of the present invention.
It is a side sectional view showing only a different structure from the figure. Explanation of the main parts of the diagram C... Upper knife cylinder C... Lower knife cylinder j, 4'... Upper and lower knives! ,A,? ...Shikumari patent applicant Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] A rotary cutter is composed of a pair of knife cylinders, each of which has a knife extending in the axial direction on its outer circumferential surface and rotates in opposite directions, and cuts a workpiece passing between the two cylinders with the interfering portion of both knives. A rotary cutter characterized in that at least one of the pair of knife cylinders is reciprocated in the axial direction.