JPH0579478B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a sheet material cutting device that uses a circular rotary blade that rotates and moves in cooperation with a long fixed blade.

2. Description of the Related Art In recent years, as one type of cutting device for band-shaped sheet materials such as paper, a circular rotary blade that moves while rotating and a long-shaped blade are used, which have advantages such as being able to eliminate the effects of wear on the blade edge. Cutting devices in combination with fixed blades have come into use. In this type of cutting device, the rotating blade is slightly inclined relative to the fixed blade so that the peripheral part of the rotating blade comes into pressure contact with the edge of the fixed blade at one point in front of the moving direction of the rotating blade. This is important in ensuring sharpness. In particular, in order to cut the sheet material not only when the rotary blade moves forward, but also when it moves backward, the above-mentioned slope of the rotary blade is adjusted.
A device having means for switching between forward movement and backward movement has been proposed (for example, Japanese Patent Publication No. 50-24466).

A conventional sheet material cutting device will be described below. FIG. 6 is a perspective view showing a schematic configuration of a conventional sheet material cutting device, and FIG. 7 is a plan view of the device shown in FIG. 6 viewed from above. In these figures, 1 is a sheet material such as paper, 2 is a long fixed blade installed under the sheet material 1, and here, the upper surface of the fixed blade 2 is 2a, and the edge is 2b. do. 3
4 is a guide rail installed above the sheet material 1 so as to be parallel to the edge 2b of the fixed blade 2; 4 is a rotary blade support member loosely fitted into the guide rail 3; 5 is a rotary blade support member 4; A swinging lever is swingably mounted on the front part of the upper surface; 6 is a headed shaft for making the swinging lever 5 swingable; 7a, 7b;
is a pin that limits the swinging of the swinging lever 5; 8 is a shaft fixed to the front part of the swinging lever 5; 9 is a spring fitted into the shaft 8; 10 is a rotatable member at the tip of the shaft 8. The attached rotary blade, 12 is a pin fixed to the rear end of the upper surface of the swing lever 5, and 13 is a wire, each end of which is fixed to the pin 12.

The operation of the sheet material cutting device configured as described above will be described below.

First, the sheet material 1 is fed close to the upper surface 2a of the fixed blade 2 and placed in place. On the other hand, spring 9
presses the rotary blade 10 forward, and as a result, the peripheral part of the rotary blade 10 touches the edge 2b of the fixed blade 2.
It is constantly in pressure contact with the Also, the wire 13 is passed along the guide rail 3, and is driven by a suitable drive mechanism (not shown) for each cutting process.
It is designed to be pulled alternately from side to side. In FIG. 7, the wire 13 is pulled to the left, so the rotary blade support member 4 is
are pulled and moved in the same direction through the As a result, the rotary blade 10 also moves to the left. At this time, the swinging lever 5 swings clockwise around the headed ring 6, and its rear arm is in pressure contact with the pin 7a, so that the rotary blade 10 connects its end face to the edge of the fixed blade 2. 2b by an angle θ. Therefore, the rotary blade 10 rolls while bringing the forward portion in the forward direction into point pressure contact with the edge 2b of the fixed blade 2. As the rotary blade 10 moves, the sheet material 1 is cut from the right side in FIG. 7 by the peripheral portion of the rotary blade 10 that is in point pressure contact with the edge 2b of the fixed blade 2.

When the cutting process is completed as described above, the wire 13 is pulled to the right in FIG.
The swing lever 5 swings counterclockwise around the headed shaft 6, and presses its rear end against the pin 7b. As a result, the end face of the rotary blade 10 is oriented in the opposite direction to that described above.
It is inclined with respect to the edge 2b of the fixed blade 2.
Therefore, the peripheral portion of the rotary blade 10 is in point pressure contact with the edge 2b of the fixed blade 2 at its right side. On the other hand, the sheet material 1 is stopped after being fed the required amount, and cutting is performed by the backward movement of the rotary blade 10, that is, by the movement to the right in FIG.

Problems to be Solved by the Invention However, in the above conventional configuration, the inclination of the rotary blade is switched by a wire that is pulled left and right and components such as a swing lever that swings around a fulcrum shaft. Because of this basic configuration, there was a problem in that the device for switching the rotary blades was complicated and expensive.

The present invention solves the above conventional problems,
Without complicating the device, the circular rotary blade that rotates and moves with a simple structure and the elongated fixed blade work together, and the rotary blade can easily remove strips of paper, etc. in both the forward and backward movements. It is an object of the present invention to provide a sheet material cutting device that can cut sheet materials well.

Means for Solving the Problems In order to achieve this object, the sheet material cutting device of the present invention has at least three rollers arranged in the moving direction of the rotary blade on the rotary blade support member, and these at least three rollers are arranged in the direction of movement of the rotary blade. Among the rollers, one roller in the center is always in contact with a guide rail that guides the reciprocating movement of a moving body consisting of a rotary blade support member, etc.
At least two other rollers are arranged at a position retreated from the guide rail by an amount corresponding to the inclination angle when the peripheral portion of the rotary blade is brought into contact with the edge of the fixed blade.

Effect With this configuration, in both forward and backward movements of the rotary blade, at least one center roller among at least three rollers and a roller on the rear side in the moving direction of the rotary blade By having a total of two rollers in contact with the guide rail, there is no need to use a swinging lever that swings around the fulcrum shaft.
With an extremely simple configuration, it is possible to ensure an inclination when the peripheral portion of the rotary blade contacts the edge of the fixed blade.

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

FIG. 1 is a perspective view of a sheet material cutting device according to an embodiment of the present invention, and FIG. 2 is a side sectional view taken from the direction of arrow E in FIG. In these figures, numeral 30 denotes a sheet material which is a material to be cut and is omitted in FIG. 20 is an elongated fixed blade, 20a is the edge of the fixed blade, 19 is a rotating shaft, 21 is a circular rotating blade rotatably supported around the rotating shaft 19, 22
31 is a collar that maintains the gap between the rotary blade 21 and the bearing 22; 32 is the rotary blade 2;
1, a leaf spring 23 that presses the peripheral part of the rotary blade 21 toward the edge 20a of the fixed blade;
4 is a fixing screw for the leaf spring 23; 25 is a rotary blade support member that is alternately pulled left and right and moves together with the rotary blade 21; and 26a and 26b are rotary blade support members 25.
Fixed pins 27a and 27b are fixed at their ends to the fixed pins 26a and 26b, and wires are pulled alternately in the left and right directions by a driving means (not shown); 28 is the rotary blade 21 and the rotary blade; This is a guide rail that guides the moving direction of the moving body made of the support member 25 and the like. In addition, the rotary blade support member 2
In this embodiment, a total of six rollers including rollers 29a and 29b are attached to the roller 5, and these six rollers are used as wheels when moving the rotary blade support member 25 along the guide rail 28. It functions as follows. 28a, 28b, 28c, 28d, 28 shown on the guide rail 28
The symbols e and 28f are for explaining the installation positions of the six rollers. Rotary blade support member 2
The positions of the six rollers attached to the guide rail 28 are such that the six rollers attached to the roller 2 are in contact with the upper surface 28a of the guide rail 28.
Rollers 33a, 33b and 33 are placed in the space narrowed by the two side walls 28b and 28e.
The rollers 34 are installed such that the rollers 34c and 34c ride on the shelves 28f.

The arrangement of these rollers will be explained in detail with reference to FIG. Figure 3 is in Figure 1,
It is a plan sectional view seen from above with the upper plate portion of the guide rail 28 removed. The above-mentioned roller 33a,
The rollers 33b and 33c are installed almost in a line along the guide rail 28, but among these rollers, the two rollers 33a and 33c at both ends are in contact with their respective outer peripheries and the outer periphery of the center roller 33b. The tangents F and F' touch the outer periphery of the central roller 33b and are drawn parallel to the end surface of the rotary blade 21 (which coincides with the side wall 28b in FIG. 3), respectively. It is arranged to move backward by an angle θ.

In this arrangement, due to the balance of forces described below, the central roller 33b is in contact with the side wall 28b at point G, and the rollers 33a or 33c at both ends are in contact with the side wall 28b at point G.
does not come into contact with the side wall 28e. FIG. 4 is a diagram showing a portion that reciprocates together with the rotary blade 21 and the rotary blade support member 25, that is, a moving body extracted from FIG. 2. The thick arrow indicates the direction of the force applied to the moving body from the outside. The movable body moves the rotary blade 21 to the edge 2 of the fixed blade 20 by the leaf spring 23.
Since it is pressed toward 0a (see FIG. 1), it receives a reaction force P from the edge 20a of the fixed blade 20. Due to this reaction force P, the movable body tries to move to the right in FIG. 4, so the roller 33b comes into contact with the side wall 28b of the guide rail 28 (see FIG. 2) and receives the reaction force Q. Here, P=Q, and the forces in the left and right directions are balanced. Further, the roller 34 is connected to the guide rail 28
The rollers 29a and 29b receive an upward force R from the shelf 28f (see FIG. 2), and a downward force S from the eaves 28a of the guide rail 28. The magnitude of these two forces satisfies R=S, and the forces acting in the vertical direction are also balanced. However, in order to simplify the explanation, the drag force received from the sheet material 30 as the rotary blade 21 cuts through the sheet material 30 (see FIG. 2) is omitted here.

By the way, P and Q form a couple, so when the distance between P and Q is l as shown in Figure 4,
Counterclockwise moment of inertia P× relative to the moving body
give l. On the other hand, R also forms a couple, and as shown in FIG. 4, when the distance between R and S is m, a clockwise moment of inertia R×m is imparted to the moving body. Here, P×l=R×m, and the moments of inertia are also balanced.

From the above explanation, the force that the moving body receives from the outside is balanced by P, Q, R, and S, so the third
As shown in the figure, the roller 33b contacts the side wall 28b of the guide rail 28 at point G, and the rollers 33a and 33c are not pressed against the side wall 28e.

The operation of the sheet material cutting device configured as described above will be described below.

First, when the required amount of sheet material 30 (see FIG. 2) is fed and placed at a predetermined position close to the fixed blade 20, one of the wipers 27a and 27b is driven by an appropriate drive means (not shown). Twisted and pulled. In this example, 27a will be pulled first. As a result, the moving body including the rotary blade 21, the rotary blade support member 25, etc. moves to the right along the guide rail 28. When moving, the rotary blade 21 and the rotary blade support member 25 move while maintaining a constant inclination with the guide rail 28, which will be explained with reference to FIGS. 3 and 5. Fourth
A force Q received from the side wall 28b of the guide rail 28 shown in the figure acts on the roller 33b at a point G shown in FIG. In other words, since it acts at one point, the balance of forces on the rotary blade support member 25 is unstable, and it becomes possible to rotate around point G. Further, FIG. 5A is a plan sectional view showing a state in which the rotary blade support member 25 in FIG. 3 is being pulled by the wire 27a and is moving in the direction of arrow D. The member 25 is pulled to the right by the wire 27a, while the rotary blade 21 receives cutting resistance from the fixed blade 20 and the sheet material 30. As a result, the rotary blade support member 25 generates a rotation moment in the counterclockwise direction, rotates counterclockwise, and the roller 33c comes into contact with the side wall 28b of the guide rail 28 at point H, so that it is in a stable state. ,
Move in the direction of arrow D. At this time, the rotary blade support member 25 is inclined at an angle θ with respect to the guide rail 28. Incidentally, the rotary blade 21 is held substantially parallel to the rotary blade support member 25 by the leaf spring 23. Therefore, the rotary blade 21
The fixed blade 20 will be tilted by approximately the angle θ,
As a result, the peripheral part of the rotary blade 21 and the fixed blade 20
The edge 20a touches at one point in front of the rotary blade moving direction,
To cut a sheet material 30 well.

Next, when the rotary blade support member 25 moves backward, it is similar to when it moves forward. FIG. 5B is a plan sectional view showing a state in which the rotary blade support member 25 is being pulled by the wire 27b and is moving in the direction of arrow D'. Here, the sheet material 30 has been fed the required amount and is stopped, as in the forward movement. This time, the rotary blade support member 25 is pulled to the left by the wire 27b, creating a clockwise rotational moment, and the roller 33a comes into contact with the side wall 28b of the guide rail 28 at point J. As a result, the rotary blade support member 25 is tilted at an angle θ with respect to the guide rail 28 in the opposite direction to the forward movement, and the peripheral part of the rotary blade 21 is connected to the edge 20a of the fixed blade 20 and the front side in the rotary blade movement direction. The sheet material 30 is cut well by moving in the direction of arrow D' while touching at one point.

As described above, according to this embodiment, the three rollers 33a, 33b,
33c, the central roller 33b and the rotary blade 21
The rear end roller (33a or 3
3c), a total of two rollers are on the guide rail 28.
By contacting the side surface 28b of the rotary blade 21
The inclination when the peripheral portion of the rotary blade 21 abuts against the edge 20a of the fixed blade 20 can be ensured both during the forward movement and during the backward movement.

Effects of the Invention The present invention provides a rotary blade support member that moves in the cutting direction of the sheet material with at least three rollers lined up in the moving direction of the rotary blade, and moves the rotary blade support member along a guide rail. By slightly devising the arrangement of the rollers, which are parts of Both of the double movements have the effect of being able to cut the sheet material well.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a schematic configuration of a sheet material cutting device according to an embodiment of the present invention, FIG. 2 is a side sectional view seen from the direction of arrow E in FIG. 1, and FIG. The plan sectional view, FIG. 4, is a side view of only the parts shown in the side sectional view of FIG. 2, which extract only the parts that reciprocate together with the rotary blade, and FIGS. 5A and B.
FIG. 6 is a perspective view showing a schematic configuration of a conventional sheet material cutting device, and FIG. FIG. 6 is a plan view of the device of FIG. 6; 1, 30... Sheet material, 2, 20... Fixed blade,
2b, 20a... Edge of fixed blade, 10, 21... Rotating blade, 23... Leaf spring, 4, 25... Rotating blade support member, 13, 27a, 27b... Wire, 29
a, 29b, 33a, 33b, 33c, 34...
Roller, 3, 28...Guide rail, P, Q,
R, S...Arrow representing the direction of force, θ...An angle of inclination that the end face of the rotating blade makes with respect to the edge of the fixed blade.

Claims (1)

[Claims] 1. A circular rotary blade that rotates around a rotating shaft,
a fixed blade having an edge that comes into contact with the rotating blade; a rotating blade support member that rotatably supports the rotating blade and reciprocates along the edge of the fixed blade; and the rotating blade and the rotating blade supporting member. a guide rail for guiding the reciprocating movement of a movable body made of Among the rollers, one roller in the center is always in contact with the guide rail, and
A sheet material cutting device characterized in that the other rollers are arranged at positions farther back from the guide rail than the central roller.