JPS61152391A - Figure cut-out device using 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] [Industrial Application Field] The present invention relates to a figure cutting device using a cutter,
In particular, the relative position and relationship of the cutter can be adjusted appropriately in the X and Y directions along the line segments that make up the figure (meaning a figure of any shape, and refers to the concept of a wide range including characters and symbols; the same applies hereinafter). This invention relates to a figure cutting device that cuts out a desired shape from a plate-shaped material by being driven.

[Prior Art] When cutting out a desired figure by driving a cutter in X and Y along the line segments that make up the figure, as in the above-mentioned cutting device, the direction of the cutter blade is set in the tangential direction of the cutout shape. Must be suitable.

Otherwise, problems such as breakage of the blade or damage to the material may occur.

For this reason, the conventional figure cutting device is separately provided with a rotation drive mechanism for the cutter blade as shown in FIG.

That is, the rotation of the support 22 of the cutter blade 21 can be controlled by a drive source 23 such as a pulse motor, and the cutting edge 24 of the cutter blade 21 is set on the rotation shaft 25 of the support 22. 1m1 calculated by
A mechanism is provided in which the cutter blade 21 always maintains the tangential direction of the figure 2B at its cutting point by controlling the rotation angle of the drive source 23 based on unidirectional data.

E Problems to be Solved by the Present Invention] As described above, the conventional figure cutting device requires a separate rotary drive mechanism for the cutter blade, which inevitably makes the device complicated and expensive. Ta.

The present invention was made in view of the shortcomings of conventional figure cutting devices using cutter blades, and aims to simplify the device, reduce costs, and improve accuracy. To provide a new figure cutting device which improves the quality of cut out figures without causing any damage.

Hereinafter, the present invention will be explained based on examples.

[Means for Solving the Problems] FIG. 1(A) is a schematic diagram showing an embodiment of follow-up type cutter support means, which is a component of the figure cutting device according to the present invention.

In this Figure 1 (^), 11 is a separate conventional X.

a support member driven by a Y drive mechanism (not shown);
12 is a cutter support provided to be freely rotatable with respect to the support member 11, and 13 is a rotation axis of the cutter support 12.

Further, 14 is a cutter blade detachably attached to the cutter support 12, and 15 indicates the cutting edge thereof.

In the present invention, the cutter blade 14 is, as shown in the figure,
The cutting edge 15 is mounted at a position offset from the rotating shaft 13 by a distance.

In the configuration shown in FIG. 1(A), when a driving force F is applied in an arbitrary direction to the cutter support 12 via the support member 11 from an external drive mechanism (not shown), the first
As shown in Figure (B), the force F'' that tries to rotate the cutter blade 14 around the cutting edge 15
4 itself.

Therefore, the supporting member 11
As the cutter blade 14 is driven, the cutter blade 14 naturally rotates in the direction along the line segment and almost follows the tangential direction of the cutout shape.

One of the features of the present invention is that it includes such follow-up type cutter support means as one component.

However, as will be explained next with reference to FIG. 3, this alone may cause practical problems.

FIG. 3 shows the relationship between the line segment 31 constituting the desired figure and the locus 32 along which the cutting edge 15 moves when the follow-up type cutter support means shown in FIG. 1(A) is used.

In FIG. 3, when the support member 11 (rotary shaft 13) is driven along desired line segments 31-1 to 31-2, the cutter blade 14 (FIG. 1(A)) 14- in the figure
Line segment 31- after the arrangement of 1.14-2.14-3...
The cutting edge 15 asymptotically approaches in the direction of 2 and moves on the trajectory 32.

That is, if the follow-up type cutter support means shown in FIG. Generally, it will show a state of blunted corners.

FIG. 4 is a block diagram schematically showing the X and Y drive control section provided in the present invention to prevent the cutout shape from becoming obtuse as described above.

In FIG. 4, reference numeral 41 denotes a coordinate memory that stores coordinate information necessary for specifying a line segment of a desired shape given from the outside.For example, the line segment 5 shown in FIG.
1-1.51-2.51”3., etc., (X
O, YO); (Xl, Yl); (X2.Y2); (X3
The coordinates such as °Y3) are stored.

42 is an angle 61 to θn formed by two consecutive line segments based on the coordinate information read from the coordinate memory 41.
(However, the angle θn is the intersection angle between the line segment 51-n and the line segment 51-n+1).

43 is an X, Y drive control section, and depending on the magnitude of the intersection angle θn calculated by the calculation section 42, the following a1 or b
Selectively perform any of the operations described in . That is, when a, the intersection angle θ≧predetermined angle.

When two consecutive line segments intersect at an angle θn greater than or equal to a predetermined angle, in other words, the currently focused line segment 51-n (that is, the line segment to be cut out) and the next line segment 51-n
If +1 intersects at a relatively obtuse angle, coordinate memory 4
The coordinates (X n, Y n) read from No. 1 are set as drive target coordinates and are directly instructed to the next stage X, Y drive section 44 .

Note that 45 and 46 are drive sources such as pulse motors provided to actually drive the support member 11 in the X and Y directions based on the drive signals from the X and Y drive section 44.

When b2 intersection angle θ <predetermined angle.

When two consecutive line segments intersect at an angle θn less than or equal to a predetermined angle, in other words, the two line segments 51-n and 51-n+1
If they intersect at a relatively acute angle, the X, Y drive control section 43 sequentially executes the two operations described in (1) and (2) below.

(1) First, the final tip P n (X n, Yl
) of the dummy point Pdn, which is assumed to be located at a distance corresponding to the eccentricity fiD of the cutting edge from Fi (Xdn,
Ydn).

Then, the coordinates (X dn) of the obtained dummy point Pdn.

Y dn) as the drive target coordinates, the next stage X, Y drive unit 44 is commanded to move the support member 11 to the target coordinates.

(2) Drive source 4 corresponding to the commands to the above-mentioned X and Y drive section 44
When the operation 5.46 is completed, next, the line segment 51-n
The next line segment 51 from the drive target coordinates (Xdn, Ydn) centering on the final tip P n (X n, Yl) of
-n+1 above, a command to rotate the support member 11 (rotary shaft 13) using the eccentricity scale as a radius is given by X, Y.
A command is given to the drive section 44.

The operation of the X, Y drive control section 43 described above will be explained based on a specific example shown in FIG.

In FIG. 6, for example, if the intersection angle θ1 is less than a predetermined angle, as shown in Part 1 above, first, the eccentric f
The coordinates of the dummy point P old, which is separated by f1D (Xdl, Yd
l) is commanded as the driving target coordinate, and the dummy point Pdl
The support member 11 (rotary shaft 13) moves until the end.

At this time, since the cutting edge 15 and the rotating shaft 13 are separated by a certain distance, the cutting edge 15 moves along the line segment 51-1,
This means that the final tip P1 has been reached.

Further, by the above sequence b-■, the supporting member 11 is moved around the final tip P1 (Xl, Yl) of the line segment.
(Rotary shaft 13) rotates and is brought to point Q on the next continuous line segment 51-2.

At this time, because the cutting edge 15 has already reached the final tip P1 (Xl, Yl) of the line segment 51-1 due to the sequence of step (1) above, the supporting member 11 eventually rotates around the cutting edge 15. Therefore, the position of the cutting edge 15 itself does not move.

As described above, the cutting operation corresponding to the line segment 51-1 is completed.

Next, when cutting out the line segment 51-2, assuming that the intersection angle θ2 is an obtuse angle greater than or equal to a predetermined angle, the coordinates P 2 (X 2. Y 2) are the drive target coordinates, as described in section a above. The command is directly sent to the X and Y drive unit 44 as follows, and the support member 1
1 (rotating shaft 13) moves onto the coordinate point P2.

At this time, since the rotating shaft 13 and the cutting edge 15 are separated by a distance, the cutting edge 15 is located at a distance D from the point P2 (X2.Y2).
This means that the point R (FIG. 6) on the line segment 51-2, which is just in front of you, has been reached.

As described above, the cutting operation up to point R is completed, and the line segment on the point P1 has been faithfully reproduced.

Next, the support member 11 (rotary shaft 13) moves along the line segment 51-3, starting from the coordinate P2 (X2°Y2), and performs a cutting operation corresponding to the line segment 51-3. In this case, the trajectory of the cutting edge 15 is a trajectory 61 starting from point R. 'Therefore, this cutting edge 15
As is clear from FIG. 6, the locus 61, that is, the cutout shape, slightly deviates from the desired line segments 51-2 and 51-3.

However, since the maximum value of the misalignment that occurs in this way depends on the predetermined angle that serves as the reference for comparison, by appropriately setting the predetermined angle in advance, the misalignment can be reduced to an almost negligible degree. It can be held down and does not cause any practical problems.

The embodiments described above have been described for the case where a plate-shaped material is completely cut out with a cutter, but it can also be applied as is to other cases, such as when cutting grooves along a desired shape. be.

In addition, in order to further reduce breakage of the cutting edge, the cutter blade is deflected by an appropriate amount in seven directions (directions perpendicular to the Alternatively, the amount of engagement between the cutting edge and the material may be reduced.

[Effects of the Invention 1] As described above in detail, the figure cutting device according to the present invention is equipped with a follow-up type cutter support means, and the cutter support member 11 is adjusted according to the intersection angle θ of two consecutive line segments.
(Rotary shaft 13) is characterized by having different movement paths, which eliminates breakage of the blade and damage to the material, improves the quality of the cut shapes, and simplifies the device and reduces costs. The present invention provides a graphic cutting device that makes it possible to cut out shapes.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram illustrating an embodiment of one component of a figure cutting device according to the present invention, FIG. 2 is a diagram showing an example of a conventional figure cutting device, and FIG. 3 is a conventional figure cutting device. FIG. 4 is a diagram showing the relationship between the line segment 31 constituting the desired figure and the locus 32 along which the cutting edge moves when using the figure cutter, and FIG. FIG. 5 is a block diagram showing an example of a desired line segment, and FIG. 6 is an explanatory diagram of the operation of the X and Y drive control section shown in FIG. 4. 11... Support member 12... Cutter support 13... Rotating shaft 14... Cutter blade 15... Blade edge 31... Line segment 32... Blade edge locus 4
1... Coordinate memory 42... Intersection angle calculation unit 4
3...X, Yllll! Dynamic control section 45.46...
Drive source D... eccentricity amount

Claims (1)

[Scope of Claims] A cutter support means in which the cutting edge 15 of the cutter blade 14 is rotatably supported on the support member 11 eccentrically by D from the rotation axis 13, and the relative position of the cutter support means and the material to be cut. an X, Y drive unit 44 that drives the relative positional relationship in the X and Y directions;
An intersection angle calculation unit 42 that calculates the intersection angle θ of two consecutive line segments during Y driving, and when the calculated angle θ is less than or equal to a predetermined angle, the intersection angle calculation unit 42 calculates the intersection angle θ of two consecutive line segments; , instructing a dummy point Pd assumed to be a distance away from the final tip P of the line segment by a distance corresponding to the eccentricity D as the driving target coordinates,
Furthermore, the apparatus further includes an X, Y drive control unit 43 that commands rotational drive with the eccentricity D as a radius from the drive target coordinates to the next line segment with the final tip P of the line segment as the center. A figure cutting device using a cutter with this feature.