JPH04201194A - Sheet material cutting device - Google Patents

Abstract

PURPOSE:To recover a sheet material cutting device in the failure state easily or automatically to an original state by moving a circular blade in the pressure contact direction between the circular blade and a fixed blade and in the direction away from the fixed blade when the circular blade is at a standby position at one end of the longitudinal direction of the fixed blade. CONSTITUTION:When a sheet material to be cut is erroneously put into a cutting part in plural or when a sheet material to be cut which is thicker and harder than usual is inserted, a repulsive force acting between a rail 2 and a fixed blade 6 is increased, and if resulted deflection exceeds an overlapping amount of a blade edge 7 of the fixed blade 6 and a peripheral edge of a circular blade 1, the circular blade 1 rides onto the fixed blade 6. However, the circular blade 1 can not be moved much because of a retaining ring 9 and it is moved to a standby position riding on the fixed blade 6. When a rod 10 placed at the standby position for pushing back the circular blade 1 is pushed in the direction shown by an arrow A in this state, the circular blade 1 is recovered to a normal state.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a method for cutting sheet materials used in devices such as copying machines and printers to cut paper, film, etc. as recording media into arbitrary lengths. 6 [Prior Art] Conventionally, this type of sheet material cutting device was developed, for example, by
This method is disclosed in Japanese Utility Model Application Publication No. 24'466, Japanese Utility Model Application Publication No. 14491/1983, or Japanese Utility Model Application Publication No. 117096/1988. All of these are composed of a fixed blade with a straight cutting edge and a disc-shaped round blade that rotates while pressing and sliding a peripheral edge against the cutting edge.The round blade is rotatably mounted on a movable table. The movable platform is suspended on a rail for movement in the left and right longitudinal directions. The sheet material to be cut is
In order to pass between the fixed blade and the rail, both the fixed blade and the rail are fixed so as to maintain a fixed positional relationship with each other at the left and right ends.

[Problem to be solved by the invention] In the sheet material cutting device having the conventional structure as described above,
Both fixed blades and rails can be considered to be beams that are supported or fixed at both ends, so they tend to sag, especially at the center, which can prevent multiple sheets of material from accidentally entering the cutting section. When the cutting force exceeds a certain level, such as when a sheet material to be cut that is thicker and harder than usual is inserted, the fixed blade or If bending deformation occurs in the rail, the round blade is pressed against the fixed blade, so the cutting edge of the round blade will ride on the top surface of the fixed blade, making it impossible to perform subsequent cutting operations. cause a phenomenon.

Normally, cutting equipment with this type of blade is installed in a place where it cannot be easily accessed from the outside for the safety of the operator, so in order to restore the cutting equipment that has experienced this type of malfunction, This requires a large amount of man-hours to be carried out by dedicated repair workers.

In order to prevent such problems from occurring, it is desirable to increase the rigidity of each member so that the fixed blade or rail does not easily bend. This is not desirable since it becomes heavy and expensive.

In addition, it is important to avoid accidentally inserting more than one sheet into the cutting section, and to avoid using sheets that are thicker and harder than a certain level. It is difficult to ensure perfection in a device that is used by an unspecified number of operators.

[Means for Solving the Problems] The sheet material cutting device of the present invention, as a first means for solving the above-mentioned problems, moves the round blade that is pressed against the fixed blade in the pressing direction. The aim is to create a structure that suppresses the amount to the minimum necessary range, and as a second means, in the standby position of the round blade at either the left or right end of the fixed blade or both ends,
The feature is that a means for pushing out the round blade in a direction opposite to the pressing direction is provided.

Since the round blade has not moved significantly from its normal position due to the first method, it is very easy to return the round blade to its normal position by pushing it in the left and right standby positions. It is.

As a second means, by utilizing the fact that the round blade is driven left and right, in either the left or right standby position or both,
This makes it possible to install a mechanism that automatically pushes out the round blade.

Alternatively, by providing a sloped notch at one or both ends of the cutting edge of the fixed blade, it is possible to return the round blade to its normal standby state without having to push the round blade with power.

That is, the present invention provides a sheet material cutting device comprising a fixed blade having a straight cutting edge and a disc-shaped round blade that rotates while pressing and sliding on the two peripheral edges of the cutting edge C. means for limiting the amount of movement in the direction; when the round blade is in a standby position at one end of the fixed blade in the longitudinal direction, the round blade is moved away from the fixed blade in a pressure contact direction between the round blade and the fixed blade; A sheet material cutting device characterized by having a means for moving the blade, and a means for limiting the amount of movement of the round blade in the axial direction in the same sheet material cutting device;
At a standby position of at least one end of the fixed blade in the longitudinal direction, a sloped notch of a size exceeding the amount of movement limited by the means for limiting the amount of movement of the round blade in the axial direction is formed on the cutting edge of the fixed blade. This is a sheet material cutting device characterized by processing.

[Function] In the present invention, even if the cutting edge of the round blade runs over the cutting edge of the fixed blade due to an erroneous operation, the device can be easily or automatically restored to its original state by manual operation, and the device can be used continuously. can be placed in a state of

[Example] FIG. 1 shows an example of the first invention of the present application. The round blade l is rotatably attached to a shaft 4 fixed to a movable table 3 which is attached to a rail 2 so as to be able to slide from side to side. They are in pressure contact.

A retaining ring 9 is attached to the tip of the shaft 4 to limit the amount of movement of the round blade 1 in the axial direction.

If multiple sheets of sheet material to be cut accidentally enter the cutting section, or if a sheet material to be cut that is thicker and harder than usual is inserted, the repulsive force acting between the rail 2 and the fixed blade 6 will increase. If the deflection that occurs exceeds the amount of overlap between the cutting edge 7 and the peripheral blade 8, the round blade 1 will ride on the fixed blade 6.

However, the round blade 1 cannot be moved very much due to the retaining ring 9, so it moves to the standby position while riding on the fixed blade 6.

In this state, by pushing the rod 10 placed at the standby position for pushing back the round blade 1 in the direction of arrow A, it is easy to return the round blade 1 to its normal state.

FIG. 2 shows another embodiment of the first invention of the present application, in which a wedge-shaped protrusion 11 is installed at one end of the fixed blade 6, and the round blade l collides with this protrusion 11 and at the same time springs up. 5 and returns to the normal standby position. Such a protrusion may be provided only at one end of the fixed blade 6, or may be provided at both ends.

FIG. 3 shows an embodiment of the second invention of the present application, in which a sloped notch 12 is provided at one end of the fixed blade 6.
When the round blade l comes to this position, its cutting edge moves downward and returns to its original state. Such a sloped notch may be provided only at one end of the fixed blade 6, or may be provided at both ends.

[Effects of the Invention] According to the present invention, it is possible to easily or automatically restore a sheet material cutting device to its original state after it has become malfunctioning due to an erroneous operation that is generally considered to be unavoidable, thereby reducing the downtime of the device. It is possible to obtain the effect of being able to minimize the amount of damage.

[Brief explanation of the drawing]

1 and 2 are perspective views showing an embodiment of the first invention of the present application, and FIG. 3 is a perspective view showing an embodiment of the second invention of the present application. 1: Round blade, 2 Rail, 3 - Moving table, 5: Spring, 6 Fixed blade, 9゛ Retaining ring, lO: Drive rod, 11 protrusions, 12: Notch Figure 1 Figure 2 Figure 3 rI! J,,,4: Axis

Claims (4)

[Claims] (1) In a sheet material cutting device composed of a fixed blade having a straight cutting edge and a disc-shaped round blade that rotates while sliding a peripheral blade in pressure contact with the cutting edge, movement of the round blade in the axial direction means for limiting the amount; and when the round blade is in a standby position at one longitudinal end of the fixed blade, moving the round blade in a direction away from the fixed blade in a pressure contact direction between the round blade and the fixed blade. A sheet material cutting device characterized in that it has a means for cutting. (2) The device according to claim 1, further comprising a drive rod that pushes and moves the round blade in a direction opposite to the pressing direction of the round blade at a standby position at one end of the fixed blade in the longitudinal direction. Sheet material cutting equipment. (3) A tilted wall surface is provided at a standby position at one end of the fixed blade in the longitudinal direction, and the drive movement of the round blade in the left and right longitudinal direction is converted into a direction in which the round blade is moved away from the fixed blade. The sheet material cutting device according to scope 1. (4) In a sheet material cutting device configured with a fixed blade having a straight cutting edge and a disc-shaped round blade that rotates while sliding a peripheral edge on the cutting edge, the amount of movement of the round blade in the axial direction and a slope-shaped notch having a size that exceeds the amount of movement limited by the means for limiting the amount of movement of the round blade in the axial direction at a standby position of at least one end of the fixed blade in the longitudinal direction. A sheet material cutting device characterized by processing a fixed blade into a cutting edge.