JP3518771B2 - Sheet material cutting device and cutting method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cutting a guillotine type sheet material in which a movable blade is slidably moved relative to a fixed blade to cut a roll-shaped recording paper or a continuous folding sheet into an arbitrary length. The present invention relates to a device and a cutting method.

[0002]

2. Description of the Related Art A sheet material cutting device mounted on a mini printer or the like having a recording paper width of about 150 mm or less is required to be small and lightweight and have a long service life as the printer body is miniaturized. Cutting (full cut), or
A function to perform uncut cutting (partial cutting) is required. A cutting device called a normal rotary type, which has been widely used in the past, cannot be installed in a mini-printer or the like because, for structural reasons, a partial cut for partially leaving uncut cannot be performed. For this reason, a cutting device for a mini-printer in which a full cut or a partial cut must be arbitrarily selected is a cutting device using a saw-toothed blade, a so-called guillotine type in which a movable blade moves up and down with respect to a fixed blade. A cutting device is often used.

A saw blade-shaped thin blade tool described in Japanese Utility Model Laid-Open No. 62-172595 and a counter blade provided with a groove into which the saw blade-shaped tool is recessed are arranged so as to face each other. It is widely used to cut a sheet between a mating blade and a saw blade so as to penetrate the sheet. Further, Japanese Patent Application Laid-Open No. 01-289697 discloses a device that cuts a sheet from both ends toward the center while the thin plate-shaped movable blade having a V-shaped cutting edge line and the cutting edge of a fixed blade on the other side cross-contact with each other. Has been done. Furthermore, the actual Kaihei 02-1
No. 10496 also comprises a movable blade having an inverted V-shaped cutting edge and a fixed blade having a straight blade edge, and a shear angle is formed from the left and right sides of the blade toward the center, and the movable blade is vertically and horizontally with respect to the fixed blade. A cutting device is disclosed which operates simultaneously in both directions.

[0004]

Recently, the sheet material cutting device mounted on a mini-printer or the like is not only a low-priced, small-sized and light-weighted device, which is equipped with a driving unit and only performs a full cut, and only a partial cut. There has been an increasing demand for a cutting device having a function of selecting two types of cutting, full cut and partial cut. 62-17259
The cutting device using the saw-toothed blade described in No. 5 is
Cutting is done by making a hole in the paper with the sharp edge of the cutting tool, then opening this hole and cutting it off at the cutting edge of the trough, so cut the paper by increasing or decreasing the depth of the cutting edge of the saw blade. Alternatively, perforations may be left uncut. However, in this cutting device, the sharpness greatly depends on the sharpness of the tip of the blade, and the blade is easily worn by repeated use.

Since the cutting device described in Japanese Utility Model Laid-Open No. 2-110496 has a structure in which the movable blade moves not only vertically but also left and right, an extra movable blade length is required for an effective cutting width.
The cutting device becomes larger in the width direction of the sheet. Actual Kaihei 01-289
In the cutting device described in No. 697, the sheet is cut by a pair of blades including a movable blade having a V-shaped concave cutting edge and a fixed blade that presses the cutting edge against the cutting edge. Therefore, the structure is highly reliable with the same principle as the scissors. In addition, it is possible to partially leave an uncut portion on the sheet as necessary. The general structure of this type of cutting device is such that a slider provided at the center of a movable blade can reciprocate in a long hole of a thin plate-like elastic frame as shown in FIGS. It is mounted like a sandwich between the movable blade and the plate nut. Further, in order for the slider to reciprocate while sliding in the elongated hole, it is necessary that the slider has a diameter slightly smaller than that of the elongated hole and a thickness slightly larger than that of the frame.

Further, since the movable blade is assembled by superposing it on the fixed blade fixed to the frame, the blade edges interfere with each other by a step corresponding to the thickness of the fixed blade, and the interference causes bending of the frame. This is a structure in which the blade edges are brought into pressure contact with each other, and at present, this structure is most often used as a cutting device for a mini printer. However, the guillotine-type cutting device having this structure has a structure in which the movable blades recessed in a V-shape and a fixed blade having a straight blade edge are cross-contacted to each other to obtain meshing of the blade edges. Since the meshing is obtained by bending one of the blade materials, the angle at which the blade edges intersect, that is, the biting angle tends to gradually decrease from both ends to the central portion.

In particular, in the vicinity of the central portion of the V-shaped movable blade, the biting angle of the blade edges approaches 0 °, and the mutual meshing of the blade edges becomes linear meshing, which makes stable cutting difficult. If this point is observed microscopically, it means that the sheet is forcibly torn near the end of cutting.
The present invention has been made to make it easier to use the above-mentioned conventional cutting device, and makes the mutual engagement of the cutting edges from cutting start to cutting end stable from beginning to end, and stable cutting even at the center of the end of cutting. An object of the present invention is to provide a sheet material cutting apparatus and a cutting method capable of cutting the sheet material.

[0008]

DISCLOSURE OF THE INVENTION In order to solve the above-mentioned problems, the present invention has been studied, and as a result, a thin plate-like movable blade having a V-shaped cutting edge line and a blade edge press-contacted thereto. In a cutting device having a structure of a fixed blade that generates a mesh, a deformed cutting groove is provided in the V-shaped central portion of the movable blade,
It has been found that the movable blade and the fixed blade generate a stable meshing from the start to the end of the cutting to form a biting angle by generating a local bending in the central portion of the V-shape, thereby completing the present invention. I did.

In a cutting device using a movable blade having a V-shaped cutting edge line, in order to stabilize the meshing, the central portion of the fixed blade fixed to the frame is curved in advance in a convex shape,
The center part of the movable blade may be bent in the press contact direction. However, in any case, the meshing of the cutting edges becomes linear near the end of cutting (center part), and the biting angle is 0 °.
There is a phenomenon that approaches. The present invention is characterized by maintaining a stable meshing by providing a deformed groove in the center of the movable blade.

Specifically, the present invention specifically comprises a fixed blade having a cutting edge that is substantially straight in the cutting direction and a thin plate-shaped movable blade whose V-shaped recessed cutting edge is in pressure contact with the fixed blade. At least one cutting edge of the movable blade has a convex warp in the pressing direction with respect to the other cutting edge, and the movable blade is cut in the vicinity of the V-shaped bottom portion which is the central portion of the V-shaped recessed cutting edge. A sheet material cutting device having a deformed groove for providing a biting angle at the end portion. Also,
A fixed blade having a cutting edge that is substantially straight in the cutting direction and a thin plate-shaped movable blade whose V-shaped recessed cutting edge is pressed against the fixed blade are convex in the pressing direction with respect to the other cutting edge. The movable blade is provided with a deformed groove near the bottom of the V-shape which is the center of the V-shaped recessed edge, and the vicinity of the deformed groove is locally bent to bite at the end of cutting. A method for cutting a sheet material, which is characterized in that a corner is provided. The deformed groove referred to in the present invention is a general term except for a simple U-shaped or V-shaped shape dug parallel to the cutting direction.

[0011]

In the sheet material cutting device of the present invention, the shear angle is formed by forming the V-shaped concave edge line of the movable blade material. Then, when the fixed blade and the movable blade are brought into pressure contact with each other, the mutual blade edges generate a warp in a relatively convex direction in the pressure contact direction to form a pressure contact force and a biting angle. In the sheet material cutting device of the present invention, both the movable blade having the V-shaped blade edge line and the fixed blade are pressed in order, while cutting from both ends of the blade edge toward the center with the same biting angle as scissors. The cutting is completed at the central part.

The major difference between the scissors and the sheet material cutting device of the present invention is that the scissors change from the beginning to the end of cutting such that the shear angle formed by the cutting edges gradually decreases, whereas in the present invention, the shearing angle changes gradually. Since the blade edge of the movable blade is V-shaped, the shear angle remains constant from beginning to end, and the operating force of the movable blade required for cutting is almost constant. In the present invention, the pressure contact force of the movable blade with respect to the fixed blade requires a force equal to or more than the minimum force required for cutting the set sheet, and the pressure contact force of the frame to which the movable blade is slidably fixed is required. Since the structure is obtained by bending, the rigidity of the frame must be more than the minimum pressure contact force. If the rigidity of the frame is insufficient, the engagement of the cutting edge will be weakened,
This is because the cutting of the paper becomes unstable.

When the cutting is started and the cutting edges start to mesh with each other, the movable blade is pressed against the central support portion at a position farthest from the support portion, so that the thin plate-shaped movable blade and the fixed blade are in a mutually convex state. The bent angle shows the maximum value in the bent state. The warp amount of the movable blade gradually decreases as the meshing of the cutting edges moves to the central portion, the biting angle also decreases, and the biting angle becomes 0 near the end of cutting in the central portion. A deformed groove is provided in the center of a thin plate-shaped movable blade that is recessed in a V shape, and the vicinity of this groove is further locally deflected to give a biting angle with the fixed blade at the center of cutting. As a result, the meshing can be stabilized until the end of cutting.
The stable meshing eliminates the need to apply a strong pressure contact force to the movable blade, and can prevent excessive wear of the cutting edge.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments and drawings. FIG. 1 is an assembly conceptual diagram showing the structure of an embodiment of the sheet cutting apparatus of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 shows a state of a deformed groove portion provided in the central portion of the movable blade near the end of cutting. FIG. 4 is a sectional view, and FIG. 4 is a plan view showing the shape of the modified groove of another embodiment. 5 and 6 are an assembly conceptual view and a sectional view of a conventional cutting device. The movable blade 1 is fixed to the central portion of a movable blade base 12 having a plate thickness of 1.2 mm by using a plate nut 6 and a screw 7 via a slider 5 slightly thicker than the plate thickness of the frame 4 by about 0.2 mm. The slider 5 has a smaller size than the slide hole 42 provided in the central portion of the frame 4, and is fitted so as to slide in the slide hole 42.

At the bottom, which is the center of the V-shape of the movable blade 1,
An approximately S-shaped deformed groove 11 was provided, and the fixed blade 3 was fixed below the observation window 41 provided in the frame 4 with an adhesive. The sheet cutting device assembled in this way is
A shear angle is formed between the fixed blade edge 31 and the fixed blade edge 31 by the V-shaped movable blade edge 12, and the movable blade 1 and the movable blade base metal 2 bend in accordance with the thickness of the fixed blade 3 to cause the fixed blade to bend. 3 and the movable blade 1 are pressed against each other, and the frame 4 and the fixed blade 3 are warped in the pressing direction to form a biting angle. The sheet (not shown) fed through the sheet passing window 41 provided in the frame 4 starts to be cut from both ends of the sheet when the movable blade 1 moves downward, and ends at the central portion.

In the sheet material cutting device of the present invention,
As shown in FIG. 3, due to the action of the irregular groove 11 provided on the movable blade 1, the protrusion formed by providing the irregular groove further bends and meshes with and meshes with the cutting edge at the cutting center (near the cutting end). Maintains the included angle and enables stable cutting from the beginning to the end of cutting. Although the irregular groove shown in this embodiment has a substantially S-shape, the T
The shape may be a shape, a round shape, a rhombus, or the like. An example of the shape of the irregular groove is shown in FIG. Further, in this embodiment, the inlet of the irregular groove is slightly shifted from the bottom of the V-shape to obtain the left-right balance, but the inlet of the irregular groove may be provided at the bottom of the V-shape. Further, in this embodiment, the movable blade is mainly fixed to the base metal with a plate nut and a screw through a slider, the fixed blade is fixed below a paper passing window provided in the frame, and the slider is provided in the frame. Although the present invention has been described by the structure in which the movable blade is slidably fitted into the slide hole to operate the movable blade, other structures may be used as long as the movable blade has a V-shaped recessed cutting edge line. May be

[0017]

According to the present invention, in a cutting device comprising a thin plate-shaped movable blade having a V-shaped recessed cutting edge line and a fixed blade to which the movable blade is pressed, a central portion of the thin plate-shaped movable blade is provided. By providing a notch groove, it is possible to suppress a decrease in the biting angle at the cutting center part (cutting end part) and maintain an appropriate biting amount from the beginning of cutting to the end of cutting, maintaining more stable cutting. It has become possible to provide a cutting device capable of doing so. Also, since the pressure contact force applied to the movable blade accompanying this can be reduced, the loss due to friction between the frame and the sliding portion, which occurs as a reaction force of the pressure contact force, is reduced, and the drive unit can be downsized. The effect that became possible also appeared.

[Brief description of drawings]

FIG. 1 is an assembly conceptual diagram showing an embodiment of a sheet material cutting device of the present invention.

FIG. 2 is a cross-sectional view showing the structure of an embodiment of the sheet material cutting device of the present invention.

FIG. 3 is a cross-sectional view showing a situation in the vicinity of a modified groove provided in the movable blade near the end of cutting according to the sheet material cutting device of the present invention.

FIG. 4 is a plan view showing a shape of another embodiment of the irregular groove according to the sheet material cutting device of the present invention.

FIG. 5 is an assembly conceptual diagram showing an example of a conventional sheet material cutting device.

FIG. 6 is a cross-sectional view of FIG. 5 showing an example of a conventional sheet material cutting device.

[Explanation of symbols]

1 movable blade, 11 modified groove, 12 cutting edge of movable blade, 2
Movable blade base metal, 3 fixed blade, 31 fixed blade edge, 4 frame, 41 paper passage window, 42 slide hole, 5 slider,
6 plate nuts, 7 screws

Claims (2)

(57) [Claims] 1. A fixed blade having a cutting edge that is substantially straight in the cutting direction, and a thin plate-shaped movable blade whose V-shaped recessed cutting edge is pressed against the fixed blade. At least one of the fixed blade and the movable blade. Has a convex warp in the direction of pressure contact with the other cutting edge, and the movable blade has a biting angle at the end of cutting near the bottom of the V-shaped center of the V-shaped concave cutting edge. An apparatus for cutting a sheet material, which has a modified groove for imparting a groove. 2. A fixed blade having a cutting edge that is substantially straight in the cutting direction, and a thin plate-shaped movable blade whose V-shaped recessed cutting edge is pressed against the fixed blade with respect to the other cutting edge. Is provided with a convex warp in the pressing direction, the movable blade is provided with a deformed groove near the bottom of the V-shape which is the center of the V-shaped recessed edge, and the vicinity of the deformed groove is locally bent. A method of cutting a sheet material, wherein a biting angle is provided at a cutting end portion.