JPH0994798A - Nose guide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nose guide by which a cutting edge projection quantity can be precisely regulated by means of a simple operation while loss of parts and the like is prevented. SOLUTION: In a nose guide 30, an energizing part 36 is arranged in a supporting part 31, which is arranged surroundingly around a cutter 47, movably in the vertical direction and is energized upward/downward by means of a spring body 42. On the side face of the supporting part 31, a notch part 35, in which a stepped type engaging part is formed in the upper/lower edge part, is arranged, while on the side face of the energizing part 36, a projection 39 to be engaged with the engaging part in the notch part 35 is projected. Therefore, a cutting edge projection quantity of the cutter 47 can be optionally regulated by engaging the projection 39 in the energizing part 36 with the predetermined part in the engaging part in the supporting part 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nose guide used in a cutting plotter for cutting under computer control and capable of arbitrarily adjusting the cutting depth of an object to be cut by adjusting the amount of protrusion of the cutting edge of the cutter. is there.

[0002]

2. Description of the Related Art Generally, a cutting plotter in which a cutter is moved by computer control is widely used for cutting characters and figures on a sheet material or a plate material. Some of such cutting plotters use a nose guide for adjusting the cutting depth.

As a device provided with such a nose guide, there is a cutting plotter 1 as shown in FIG.
In this cutting plotter 1, a carriage 3 holding a cutter 2 (see FIG. 8) is guided by a guide mechanism 4 on a drawing table 5 in a left-right direction (X direction) and a front-back direction (Y direction).
The cutter 2 can be moved in the vertical direction (Z direction). A nose guide 6 is attached so as to surround the periphery of the cutting edge of the cutter 2 held by the carriage 3.

As shown in FIG. 8, the nose guide 6 includes a cutter holding portion 9 having a holding hole 7 for holding the cutter 2 and a large diameter screw hole 8 provided on the lower side of the holding hole 7, and a screw on the upper side. A biasing portion 12 formed on a screw portion 10 that is screwed into the hole 8 and provided with a flange-shaped sliding surface portion 11 on the lower end portion;
The nut 13 is screwed to the screw portion 10 and fixed to the urging portion 12 while being in contact with the lower end of the cutter holding portion 9.

In use, the urging portion 12 is rotated to adjust the protruding amount of the cutting edge of the cutter 2, and then the nut 13 is rotated to tighten and fix the urging portion 12. As a result, it becomes possible to perform cutting at a depth corresponding to the height of the cutting edge of the cutter 2 protruding from the lower end surface of the sliding surface portion 11 of the biasing portion 12.

Therefore, when cutting is performed using this nose guide 6, the cutting edge of the cutter 2 protruding from the lower end of the urging portion 12 is inserted into the work piece 14 placed on the upper surface of the drawing table 5 to urge the urging portion. The sliding surface portion 11 of the workpiece 1
By moving the guide mechanism 4 and the carriage 3 according to a preset program in the state of being brought into contact with the surface of 4, characters and figures can be cut with a constant cutting depth.

[0007]

However, in the nose guide 6 as described above, the protrusion amount of the blade tip of the cutter 2 is adjusted by rotating the urging portion 12 by hand, so that the protrusion amount of the blade tip is accurately adjusted. There is a problem that it is difficult to adjust it to, and it is difficult to perform accurate cutting as set.

Further, in order to accurately adjust the amount of protrusion of the cutting edge of the cutter 2, it is necessary to know the displacement amount of the protrusion of the cutting edge of the cutter 2 for one rotation of the biasing portion 12, and to adjust the amount of protrusion to a predetermined value. Then, it becomes necessary to calculate how many times the urging portion 12 needs to be rotated. As a result, there is a problem that the operation of adjusting the amount of protrusion of the cutting edge becomes complicated, and the dimensional accuracy of the screw holes 8 of the cutter holding portion 9 and the screw portion 10 of the biasing portion 12 must be made highly accurate.

Further, since the urging portion 12 and the nut 13 are provided in a sandwiched portion between the carriage 3 and the drawing table 5, there is a problem that it is difficult to adjust the amount of protrusion of the cutting edge.

Therefore, the inventor of the present invention has developed and has already filed a patent application (Japanese Patent Application No. 6-304359) for a nose tide capable of solving the above problems. This nose guide is as shown in FIG. 9, and a cylindrical supporting portion 18 having a lower end portion formed in an engaging portion 17 having a small diameter is screwed into the screw hole 16 of the cutter holding portion 15. A biasing portion 21 having an upper end formed in a large-diameter engagement portion 19 and a lower end formed in a flange-shaped sliding surface portion 20 is disposed in the movable portion 18 in a vertically movable state.

A spring member 22 is provided between the engaging portion 17 of the supporting portion 18 and the engaging portion 19 of the urging portion 21 to urge the urging portion 21 upward so that the lower end of the supporting portion 18 is urged. A plurality of height adjusting plates 23 (only one plate is shown) can be detachably inserted between the sliding surface portion 20 of the urging portion 21 and the urging portion 21. Therefore, normally, the lower end of the supporting portion 18 and the upper surface of the sliding surface portion 20 of the urging portion 21 are in contact with each other, and the cutter 24
Although almost all of the blade edges of the cutter are projected, the urging portion 21 moves downward as the plates 23 are inserted one by one, and the amount of projection of the blade of the cutter 24 decreases.

However, in the above nose guide, there is a problem that the height adjusting plate 23 is a detachable separate component and is easily lost. Also, when adjusting the height at a very small height, a large number of thin plates 23 are prepared,
There is also a problem that it is necessary to prepare a large number of plates 23 having different thicknesses. The present invention has been made in view of such circumstances, and by improving the nose guide, it is possible to accurately adjust the protruding amount of the cutting edge with a simple operation without using a plate that is a separate component. The purpose is to provide.

[0013]

In order to solve the above-mentioned problems, a nose guide according to the present invention has a blade part in the cutter at the lower end of a carriage for holding a cutter having a blade part at the lower end. A cylindrical supporting part is provided so as to surround the upper part of the cylindrical supporting part, and a cylindrical urging part that can move up and down and rotate along an axis and has a sliding surface on the lower surface is provided on the supporting part. A nose guide provided in a state where a blade portion of a cutter is projected by a predetermined amount, and a stepped engaging portion having different height positions is formed on an upper edge portion or a lower edge portion on a side surface of the support portion. A cutout is provided, and a projection capable of engaging with the engagement portion of the cutout is provided on the side surface of the biasing portion in a protruding manner.
The biasing portion is biased upward or downward by a spring body and the projection is engaged with an arbitrary engaging portion, so that the amount of protrusion of the cutting edge of the cutter can be arbitrarily adjusted.

[0014]

That is, in the nose guide of the present invention, the urging portion is provided in the lower end portion of the carriage so as to be vertically movable via the support portion so as to surround the cutter held by the carriage, and the urging portion is formed by the spring body. Is biased upwards or downwards by. Then, the side surface of the support portion is provided with a notch portion in which a stepped engaging portion is formed at the upper edge portion or the lower edge portion, and the side surface of the biasing portion can be engaged with the engaging portion of the notch portion. It is configured by projecting various projections. That is, when the biasing portion is biased upward, a stepped engaging portion is provided at the upper edge portion of the cutout portion,
When the biasing portion is biased downward, the stepped engaging portion is provided at the lower edge portion of the cutout portion.

Therefore, the biasing portion is pushed down against the elasticity of the spring body or pushed upward to rotate about the shaft, and the projection of the biasing portion is brought into contact with the engaging portion of the support portion. It becomes possible to easily adjust the protruding amount of the cutting edge of the cutter by engaging with the portion of. As a result, the cutting depth during cutting can be set to an arbitrary constant value,
Enables highly accurate cutting.

Further, the adjustment of the protruding amount of the cutting edge of the cutter does not require rotating the urging portion or attaching or detaching the plate of another component between the supporting portion and the urging portion as in the conventional example, but the urging portion of the urging portion is adjusted. Since it is only necessary to change the engaging position between the protrusion and the engaging portion of the supporting portion, it is possible to perform the process very easily and quickly. Moreover, parts such as plates are not lost. Next, the nose guide of the present invention will be described in detail with reference to embodiments.

[0017]

1 and 2 show a nose guide 30 according to the present invention. In the figure, 31 is a short cylindrical support portion, and a screw portion 32 is engraved on the outer peripheral surface on the upper end side,
An inward flange-shaped step portion 33 is provided on the inner peripheral surface of the lower end so as to project. On the slightly lower side of the side portion of the support portion 31, semi-circular engaging portions 34a, 34b, 34 whose lower end edges are horizontal and whose upper end edges have different heights by a constant height, respectively.
The notch 35 formed in c, 34d, 34e is bored.

Reference numeral 36 denotes a substantially cylindrical urging portion which is accommodated in the support portion 31 in a vertically movable state and rotatable about an axis, and has an outward flange-shaped step on the outer peripheral surface of the upper end. The portion 37 is provided so as to project, and the recessed portion 38 is provided at three locations (only one location is visible in FIG. 2) on the lower surface of the step portion 37.

The urging portion 36 has a semi-circular engagement portion of the support portion 31 (semi-circular engagement portion hereafter, if it is not specified which semi-circular engagement portion, a semi-circular engagement portion is provided on a slightly lower side of the outer peripheral surface. A rod-shaped projection 39 having a diameter set so that it can be engaged with the circular engagement portion 34) is projected, and a large-diameter flange-shaped sliding surface portion 40 is fixed to the lower end portion. The sliding surface portion 40 has a lower surface formed as a horizontal sliding surface and an upper surface formed as a taper surface which becomes lower toward the outer peripheral side. As shown in FIG. 3, a screw 41 is formed on the body portion 36a of the urging portion 36. It is fixed.

Reference numeral 42 denotes a spring which is arranged with the upper end portion fitted in each of the three recesses 38, and the lower end portion is fixed to the upper surface of the stepped portion 33 of the support portion 31, and the biasing portion 36 is provided.
Is biased upward. Further, the projection 39 engages with each semi-circular engagement portion 34 of the cutout portion 35 and maintains the biasing portion 36 at a predetermined height against the elasticity of the spring 42.

The nose guide 30 is attached to the cutter holding portion 43 of the carriage of the cutting plotter as shown in FIG. That is, the ring-shaped body 45 having the threaded portion 44 engraved on the inner peripheral surface is fixed to the lower end portion of the cutter holding portion 43 with the screw 46, and the threaded portion 44 of the ring-shaped body 45 is supported by the support portion. By screwing the screw portion 32 of the nose 31, the nose guide 30
Is attached to the cutter holder 43.

A cutter 47 is rotatably attached to the cutter holding portion 43 along the central axis, and the tip end of the cutting edge 48 thereof projects downward from the lower surface of the nose guide 30. There is. And this cutting edge 48
As shown in FIG. 4, the protrusion 39 has a semi-circular engagement portion 34e.
When the urging portion 36 is positioned at the uppermost end by engaging with, the substantially entire cutting edge 48 comes to project from the lower end surface of the nose guide 30, and the projection 39 engages with the semicircular engaging portion 34a. When the biasing portion 36 is located at the lowermost position (the portion indicated by the alternate long and short dash line in the figure), only a small tip portion of the cutting edge 48 is projected.

In this construction, when cutting, when the cutting depth of the work piece is deep and is substantially equal to the length of the cutting edge 48 of the cutter 47, the projection 39 is engaged with the semicircular engagement portion 34e. Nose guide 30 for cutting edge 48
The amount of protrusion from the lower end surface is set to the same length as the cutting depth.
Then, in that state, move the cutter 47 to the nose guide 30.
Along with this, the cutting edge 48 is pierced into the workpiece, and the cutter 47 is moved while the sliding surface portion 40 is in sliding contact with the surface of the workpiece for cutting.

When the cutting depth of the workpiece is shallow, the sliding surface portion 40 is pulled downward to lower the urging portion 36 so that the protrusion 39 is engaged with the semicircular engaging portion 34e. To release. Then, in this state, the sliding surface portion 40 is rotated to release the sliding surface portion 40 with the projection 39 aligned with the position of the semicircular engagement portion 34a. As a result, due to the elasticity of the spring 42,
The biasing portion 36 moves up, and the protrusion 39 engages with the semicircular engagement portion 34a.

In this case, the cutting edge 48 of the cutter 47 is in a state of slightly protruding from the lower end of the sliding surface portion 40 shown by the one-dot chain line in FIG. 4, and cutting is performed in this state to cut a thin work piece. You can In addition, the projection 39 is appropriately formed according to the thickness of the workpiece by the semicircular engagement portion 34b,
By engaging with 34c and 34d, it is possible to cut workpieces of various thicknesses within the range of the length of the cutting edge 48.

As described above, the nose guide 30 is provided by a method that relies on the operator's intuition such as adjusting the amount of protrusion of the cutting edge while rotating the urging portion 12, as in the conventional example, or by a plurality of methods. Instead of adjusting the amount of protrusion of the cutting edge while attaching or detaching the plate 23, the protrusion 39 protruding from the biasing portion 36 is formed on the semicircular engagement portion 34 of the notch portion 35 provided on the support portion 31. Cutting edge 48 by engaging with a predetermined part
It is designed to adjust the amount of protrusion.

In the operation, the sliding surface portion 40 is pulled downward against the spring 42 to lower the urging portion 36 and rotate the urging portion 36 to rotate the projection 39 into a predetermined semicircular engaging portion 34.
Only by releasing the sliding surface portion 40 in a state of being matched with the position of, it is extremely easy and the accuracy of the protruding amount is improved.
Further, since another component such as the plate 23 is not used, there is no problem that the component or the like is lost. In the above embodiment, five semi-circular engaging portions are provided, but the number may be increased or decreased as required.

FIG. 5 shows a state in which the nose guide 50 according to another embodiment of the present invention is attached to the cutter support portion 43. In this nose guide 50, the step portion 52 of the urging portion 51 is not provided with the recess portion for fixing the spring, and the spring 4 is
No two are provided. Then, one large spring 53 is provided between the upper end of the urging portion 51 and the lower end of the cutter support portion 43 so as to surround the periphery of the cutter 47, and urges the urging portion 51 downward.

Further, as shown in FIG. 6, the notch 55 of the supporting portion 54 has a semi-circular engaging portion 56a, 56b, 56c, 56d whose upper edge is horizontal and whose lower edge has different heights. ，
56e is formed. The configuration of the other parts is the same as in the above embodiment. Therefore, the same parts are denoted by the same reference numerals.

With this construction, when the projection 39 of the biasing portion 51 engages with the uppermost semi-circular engagement portion 56a, the sliding surface portion 40 is positioned above (the solid line portion in FIG. 6) and the cutting edge 48 is moved. The amount of protrusion is maximized, making it possible to cut thick workpieces. Further, when the protrusion 39 engages with the lowermost semi-circular engagement portion 56e, the sliding surface portion 40 is positioned downward (the one-dot chain line portion in FIG. 6) and the protrusion amount of the cutting edge 48 is minimized, so that the thin workpiece is processed. Allows cutting of objects. Further, by engaging the projection 39 with each of the semicircular engaging portions 56b, 56c, 56d, it is possible to cut a workpiece having another thickness.

In the above embodiment, the elasticity of the spring 53 is set to be larger than the pressing force with which the sliding surface portion 40 is pressed against the workpiece so that the sliding surface portion 4 can be cut during cutting.
It is necessary to prevent 0 from moving upwards. Other functions and effects are similar to those of the above-described embodiment.

[0031]

As described above, in the nose guide according to the present invention, the amount of protrusion of the cutting edge of the cutter can be changed only by changing the engagement positions of the projection of the biasing portion and the semicircular engagement portion of the support portion. Therefore, the operation becomes extremely easy. Further, the amount of protrusion of the cutting edge is determined by the height of the semi-circular engagement portion, so that the adjustment accuracy is improved. Further, since no separate component is used, there is no problem of losing the component.

[Brief description of drawings]

FIG. 1 is a perspective view showing a nose guide according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing a state in which a part of the nose guide according to the embodiment of the present invention is cut away.

FIG. 3 is a cross-sectional view showing a state in which a nose guide according to an embodiment of the present invention is attached to a cutter holding portion.

FIG. 4 is an explanatory view showing a state in which the blade edge of the cutter projects from the lower end of the nose guide according to the embodiment of the present invention.

FIG. 5 is a sectional view showing a state in which a nose guide according to another embodiment of the present invention is attached to a cutter holding portion.

FIG. 6 is an explanatory view showing a state in which the blade edge of the cutter projects from the lower end of the nose guide according to another embodiment of the present invention.

FIG. 7 is a perspective view of a cutting plotter including a nose guide according to a conventional example.

FIG. 8 is a cross-sectional view of a conventional nose guide.

FIG. 9 is a cross-sectional view showing a state in which cutting is performed using a nose guide according to another conventional example.

[Explanation of symbols]

30,50 Nose guide 31,54 Supporting portions 34a, 34b, 34c, 34d, 34e, 56a, 5
6b, 56c, 56d, 56e Semi-circular engagement part 35,55 Notch part 36,51 Energizing part 39 Protrusion 40 Sliding surface part 42,53 Spring 43 Cutter holding part 47 Cutter 48 Blade part

Claims (1)

[Claims] 1. A cylindrical supporting portion is provided at a lower end portion of a carriage for holding a cutter having a blade portion formed at a lower end portion so as to surround an upper portion of the blade portion of the cutter, and the supporting portion is provided with a vertical support. A nose guide provided with a cylindrical urging portion that can be moved and rotated along an axis and whose lower surface is a sliding surface with a blade portion of the cutter projecting by a predetermined amount. On the side surface of the portion, a notch portion having stepped engaging portions with different height positions is formed on the upper edge portion or the lower edge portion, and the side surface of the biasing portion is engaged with the engaging portion of the notch portion. A protrusion that can be fitted is projected, the biasing portion is biased upward or downward by a spring body, and the projection is engaged with an arbitrary engaging portion, so that the protruding amount of the cutting edge of the cutter is arbitrarily adjusted. A nose guide characterized by being able to do it.