JP2574794Y2 - Cutting equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting apparatus for cutting long paper such as heat-sensitive roll paper and photosensitive roll paper into an arbitrary length in information-related equipment such as a facsimile machine.

[0002]

2. Description of the Related Art Conventionally, a cutting device of this kind is disclosed in
As disclosed in Japanese Patent Application Laid-Open No. 3-11104, a moving blade that has a linear blade surface and is driven to rotate about a rotary shaft inclined at a predetermined angle with respect to a sheet conveying surface, and a linear blade that is also a linear blade A cutting blade that has a surface and is rotatable about a rotation axis that is substantially parallel to the paper transport surface, and starts cutting the intersection of the moving blade and the receiving blade by rotating the moving blade around the rotation axis. It is known to cut a long sheet by sequentially moving from a position to a cutting end position.

Further, there is also a construction in which a receiving blade is rotatable in order to absorb a manufacturing error, a warp, or the like of each blade, and a receiving blade is constantly biased to a movable blade by a spring.

In these cutting devices, paper can be cut without limitation, regardless of the shape of the cutting edge, but in reality, the force (driving torque) applied during cutting is limited. Therefore, it is necessary to cut the paper by cutting the moving blade and / or the receiving blade to sharpen the blade edge, reduce the contact area between the blade and the paper, and increase the cutting stress generated at the time of cutting. The drive torque has been reduced.

[0005] When the cutting edge is cut,
After assembling each blade as a cutting device, the same operation as cutting is repeated several times without inserting paper, removing brittle parts of the cutting edge generated at the time of cutting, and smoothing for the first time by accommodating the cutting edges. A cutting operation can be obtained.

[0006]

However, in such a cutting apparatus using a moving blade and a receiving blade, a cutting process using a milling cutter or the like is necessary for manufacturing the blade, and cutting is performed without inserting a sheet after assembly. There is a problem in that the manufacturing cost is extremely high in the manufacturing process, such as the necessity of a break-in process such as repeating the same operation several times as at the time.

The present invention has been made to solve the above-mentioned problems, and simplifies the manufacturing process of the moving blade and the receiving blade, and can omit a break-in process after assembly.
An object is to provide an inexpensive cutting device.

[0008]

According to a first aspect of the present invention, there is provided a cutting apparatus for cutting a sheet by a pair of moving blades and a receiving blade. pressed against the edge of the body and the receiving blade, using anyone produced by press cutting, to each other physician that anyone part
Is done .

A cutting device according to a second aspect of the present invention includes a moving blade body rotatable about a predetermined axis and a cutting blade substantially parallel to a sheet conveying surface.
A receiving blade body rotatable around a rotating shaft,
An elastic body for pressing the cutting edge and the cutting edge of the moving blade body into pressure contact with each other;
In addition, the cutting edge of the moving blade body and the receiving blade body uses a wholly generated by press cutting, and a part of the wholly.
Are pressed against each other .

The moving blade body and the receiving blade body are located on the boundary side of the shearing surface generated by press cutting from the start to the end of the cutting .
It is desirable that the parts are pressed against each other.

[0011]

The cutting device according to the first invention having the above configuration is
Press cutting on the cutting edge of a pair of moving blade and receiving blade
Use who is generated, and who
The long paper is cut by pressing against .

Further, the cutting device of the second invention having the above-described configuration can make use of anyone generated by press cutting.
The moving blade body and the cutting edge of the receiving blade body are pressed against each other by the elastic contact body, and in this state, the moving blade body is rotated about a predetermined axis to move at the intersection of the moving blade body and the receiving blade body. The long paper is cut by sequentially moving the blade along the rotation locus of the blade edge.

Further, the cutting edges of the movable blade body and the receiving blade body are cut.
From the start of cutting to the end of cutting,
Located on the boundary side with the shear plane generated by cutting
Parts, that is, very small arcs are pressed against each other
That is, the long paper is easily cut.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

First, as shown in FIGS. 1, 2 and 3, the cutting device 30 of the present invention mainly comprises an upper blade unit 1 which is a movable blade, a lower blade unit 2 which is a receiving blade, and an upper blade. The cutter frame 3 supports the unit 1 and the lower blade unit 2, and the torsion spring 8 is a resilient contact body that is urged to rotate so that the lower blade unit 2 is always pressed against the upper blade unit 1. The upper blade unit 1 includes an upper blade 4 that forms a cutting blade, an upper blade frame 5 that holds the upper blade 4, pins 6 and 7 that form a rotation axis of the upper blade unit 1, and an upper blade unit 1. And a working shaft 9 for transmitting power. The pins 6 and 7 are rotatably supported by the cutter frame 3, and the upper blade unit 1 is prevented from coming off from the cutter frame 3 by attaching a retaining ring 12 to the tip of the pin 6.

The lower blade unit 2 includes a lower blade 10 that cuts a sheet in cooperation with the upper blade 4 and a lower blade frame 11 that holds the lower blade 10, and protrusions provided at both ends of the lower blade frame 11. The portions 13 and 14 are rotatably supported by holes 17 and 18 provided in the cutter frame 3, respectively.

The torsion spring 8 has a projection 13 of the lower blade frame 11 inserted into the coil portion thereof, and one of the hooks 15 is opposite to the surface on which the lower blade 10 of the lower blade frame 11 is held. The other hook 16 is hooked on the surface side, and the other hook 16 is hooked on a hole 19 provided in the cutter frame 3, and constantly urges the lower blade 10 in the direction of pressing against the upper blade 4.

Further, as shown in FIGS. 2 and 3, the pin 7 is disposed at a position displaced from the
The upper blade 4 and the lower blade 10 are configured to contact at one point by inclining the rotation axis of the lower blade unit 2 with respect to the rotation axis of the lower blade unit 2.

That is, as shown in FIG. 2, the upper blade 4 for displacing the pin 7 at a position displaced upward with respect to the pin 6 and tilting the rotation axis to sequentially move the cutting portion.
3 and the inclination angle (hereinafter referred to as shear angle) A of the lower blade 10, and FIG.
As shown in FIG.
The angle of skew B between the upper blade 4 and the lower blade 10 is determined by disposing the upper blade 4 and the lower blade 10 at a position displaced horizontally to the side and tilting the rotation axis.
Is given.

When the upper blade unit 1 is rotated by a predetermined angle about the pins 6 and 7 by the rotational force transmitted from the operating shaft 9, the cutting edges of both the upper blade 4 and the lower blade 10 start cutting. From the cutting edge to the cutting end side, whereby the sheet 20 inserted between the upper blade 4 and the lower blade 10 is cut.

Next, the sectional shape of the cutting edge used in this embodiment will be described with reference to FIG.

The cutting edge manufactured by press cutting includes (1) a portion deformed when the tool bites into the material (whore), and (2) a glossy portion rubbed on the side of the tool by receiving a large shear strain. (Cross section), (3) Cracks formed in the material, and irregularities appeared (fracture section), and FIG.
(4) comprises a portion (burr) generated when the material is torn.

[0023] Among them, a part where plastic flow is generated by the pressure applied from the tool (hereinafter referred to as a primary part) and a part where plastic deformation occurs due to frictional force with the tool near the tool (hereinafter referred to as 2nd part). Who can be next).

Although these may be included in anyone in a general sense, the second-order wholly exists at the boundary between the first-order wholly and the shear surface and has a very small radius of curvature. Since this is a part whose appearance is clearly different from the first-order who has a large radius of curvature, it is treated as another part.

The section of the secondary part has a radius of 0.0
It is an extremely small arc of about 3 to 0.05 mm , and its range (the angle indicated by θ in the figure) varies depending on various conditions at the time of press cutting, such as the material, cutting speed, cutting load, etc.
It never goes away.

Next, referring to FIGS. 5 to 10, the positional relationship between the respective blades of the design example having the upper blade 4 and the lower blade 10 will be described.

FIG. 5 shows the upper blade 4 at the beginning of cutting the paper 20.
The upper blade 4 and the lower blade 10 when the cutting device 30 is viewed from the direction of arrow X in FIG.
3 shows only the positional relationship between the pins 6 and 7 constituting the rotation axis of the upper blade unit 1, and the upper blade 4 shows only a portion necessary for cutting the paper 20. FIG. 6 is an enlarged cross-sectional view of a contact portion between the upper blade 4 and the lower blade 10, and a finely hatched portion indicates a secondary drain region.

FIG. 7 is a view similar to FIG. 5 for clarifying the positional relationship between the upper blade 4 and the lower blade 10 just in the middle between the start and end of cutting. FIG. 8 is also similar to FIG. It is an expanded sectional view of the contact part of the upper blade 4 and the lower blade 10.

FIG. 9 is similar to FIG. 5 for clarifying the positional relationship between the upper blade 4 and the lower blade 10 at the end of cutting, and FIG. 10 is similar to FIG. Lower blade 1
It is an expanded sectional view of the contact part of No. 0.

The positional relationships shown in these figures are skew angle A, shear angle B, radius of rotation of upper blade 4, lower blade 1
Although it can vary in various ways depending on the positional relationship between the rotation axis of the upper blade 4 and the rotation axis of the upper blade 4, as shown in FIGS. And upper blade 4
If the positions of the pins 6 and 7 with respect to the lower blade 10 and the radius of rotation are set so that the secondary droop of the upper blade 4 and the secondary droop of the lower blade 10 are pressed against each other even at the end of cutting after the rotation, Also, the secondary blades of the upper blade 4 and the secondary blades of the lower blade 10 come into pressure contact with each other. In addition, the shape of the cutting edge by press cutting needs to be preliminarily subjected to a preliminary test, and to measure the secondary droop region under various conditions to determine the region θ.

By setting the positions of the blades and the rotation fulcrum as described above, the very small arcs having a radius of 0.03 to 0.05 mm, which are secondary droops of the blades, are always in contact from the start to the end of cutting. In this case, the blade is pressed with a very small contact area, so that the paper 20 can be easily cut without increasing the driving torque of the driving motor, as compared with a cutting device using a grinding blade. Can be.

It should be noted that the present invention is not limited to the setting and arrangement shown in FIG. 5, and even if the position and range of the secondary wholly change due to the difference in the material of the blade and the pressing method, the blade to be used is not changed. It can be similarly implemented if the secondary blades of the upper blade and the lower blade are set so as to be pressed from the start to the end of cutting according to the shape of.

The torsion spring 8 serving as an elastic contact member for constantly pressing the lower blade unit 2 against the upper blade unit 1 can be replaced by a member capable of elastic deformation of a required amount.
If the rotation range of the lower blade unit 2 is reduced by changing the arrangement of each blade, the lower blade frame 11 of the lower blade unit 2 is fixed to the cutter frame 3 and the elastic deformation of the lower blade frame 11 alone is sufficient. Is also possible.

[0034]

[Effects of the Invention] As is apparent from the above description, the cutting device of the present invention utilizes wholly generated by press cutting for each cutting edge of the moving blade and the receiving blade, and ends the cutting from the start of cutting. Until the time, of whom, especially press cutting
On the boundary side between the shear plane generated by the work and who
Parts, that is, the sections having a radius of curvature of about 0.03 to 0.05 mm are configured to be pressed against each other, so there is no need to perform cutting by a milling machine or the like.
The break-in process after assembly can also be omitted, and the manufacturing process can be simplified and a very inexpensive cutting device can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a cutting device of the present invention.

FIG. 2 is a schematic front view of the cutting device according to the present invention, in which the cutter frame 3 is partially sectioned;

FIG. 3 is a schematic top view of the cutting device of the present invention with the cutter frame 3 partially sectioned;

FIG. 4 is a cross-sectional view of a press-cut cutting edge.

FIG. 5 is a diagram showing the positional relationship between the upper blade 4 and the lower blade 10 at the beginning of cutting the paper 20 of the cutting device of the present invention.

6 is an enlarged cross-sectional view near a contact point between the upper blade 4 and the lower blade 10 in FIG.

FIG. 7 is a diagram showing the positional relationship between the upper blade 4 and the lower blade 10 in the middle of the start and end of cutting of the paper 20 of the cutting device of the present invention.

8 is an enlarged cross-sectional view near a contact point between the upper blade 4 and the lower blade 10 in FIG.

FIG. 9 is a diagram showing the positional relationship between the upper blade 4 and the lower blade 10 at the end of cutting the paper 20 in the cutting device of the present invention.

FIG. 10 is an enlarged sectional view near a contact point between the upper blade 4 and the lower blade 10 in FIG. 9;

[Explanation of symbols]

 1 upper blade unit 2 lower blade unit 4 upper blade 10 lower blade

Claims (3)

(57) [Scope of request for utility model registration] 1. A cutting device for cutting a sheet by a pair of moving blades and a receiving blade, wherein a cutting edge of the pair of moving blades and the receiving blade is formed by using a drone generated by press cutting. In whose part
A cutting device which is pressed against each other . 2. A movable blade body rotatable about a predetermined axis.
Can be rotated about a rotation axis substantially parallel to the paper transport surface.
A receiving blade, a cutting edge of the receiving blade, and a cutting edge of the moving blade;
An elastic body for pressing the moving blade body,
Who is produced by press cutting on the cutting edge of the blade
A cutting device characterized by being pressed against each other at any part of the cutting device. Wherein the moving blade and the bed knife body, from the start cutting until the cut ends, located on the boundary side of said of the sagging, the shear surface produced by press cutting
The cutting device according to claim 1 or 2, wherein the portions are pressed against each other.