JPS624541A - Angle fixing device for workpiece - Google Patents

Abstract

PURPOSE:To enable a prescribed inclined angle to be kept, by providing a reference plane on a base table having a support table for supporting a workpiece on a working table, first and second reference portions on the support table at the side of the base table, and means for preventing rotation of the support table. CONSTITUTION:A base table 14 is provided with a reference plane 20 and receiving surfaces 26, 28 forming a concave portion 22 of V-shaped cross section. A support table 16 is provided with two concave grooves 30, 32 each forming two receiving surfaces 38, 40 and 42, 44. First and second shafts 50, 54 are attached to the V-shaped concave grooves 30, 32 with screws 52, 56. Rotation of the support table 16 is prevented by inserting a clamping screw 66 of preventing means 18 into a screw hole 24 of the base table 14 so as to enable the first shaft 50 to press the receiving surfaces 26, 28 of the base table 16. When the clamping screw 66 is loosened, the support table 16 is rotatable with respect to the base table 14 for changing an inclined angle, whereby the support table 16 can be fixed to its proper attitude.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to an angle fixing device for maintaining a workpiece in a posture inclined at a predetermined angle with respect to an object such as a processing knife or a surface plate.

(Prior Art) An angle fixing device for a workpiece generally includes a base installed on a workbench, such as a surface plate, and first and second reference parts having arcuate outer surfaces; a support stand arranged on the base to be rotatable about the first reference part and for supporting the workpiece; and a blocking means for maintaining the table in an attitude inclined at a predetermined angle with respect to the base.

As one of such angle fixing devices, the outer surface of the first reference part is pressed against the base by an IF-, female thread, or a presser plate, and the friction between the base and the first reference part is reduced. There are devices that use force to prevent rotation of the support with respect to the base.

This device is designed to prevent rotation of the support base relative to the base.
+l- When a suppressing force is applied to the support base by the female thread or the presser plate, processing errors of the set screw and the screw hole that receives it, the first reference part and the recess that receives it, the clearance or the process error of the presser plate, Furthermore, the first
Due to changes in the position at which the first reference part is pressed, the direction of the pressing force is inclined with respect to the diametrical direction of the first reference part. In this way, when the pressing force is inclined with respect to the diametrical direction of the first reference part, a component of the pressing force acts on the shaft part as a force that rotates the first reference part and thus the support base with respect to the base.

However, in the conventional device described above, since the pressing force is applied to the outer surface of the first reference part, the distance from the part of the first reference part that contacts the base to the part to which the pressing force is applied is long. Therefore, even if the component force is small, a large rotational moment acts on the shaft portion, and the first reference portion rotates with respect to the base when fixing the attitude of the support with respect to the base. In this way, if the support is rotated when the support is fixed to the base, the angle of the support with respect to the base changes, so it is difficult to fix the support in a posture tilted at the correct angle relative to the base. Can not.

Another type of angle fixing device is to rotatably support one end of an adjustment bar having an elongated hole on a base, and fix the other end of the adjustment bar to the support using a tightening screw passing through the elongated hole. There is a device that releasably fixes the angle of the support stand relative to the base.

However, since this device does not fix the center of rotation between the base and the support stand, that is, the first reference part, the support stand moves relative to the base at the first reference part.

It is not possible to fix the support stand at the correct tilt angle with respect to the base.

(Object of the Invention) An object of the present invention is to provide an angle fixing device capable of fixing a support stand in a posture tilted at a correct angle with respect to a base.

(Structure of the Invention IO &) The angle fixing device of the present invention is a base that is installed on a workbench and has a reference surface and a recess with a V-shaped cross section on the opposite side of the base from the workbench. a support stand disposed on the side of the reference surface of the base to support the workpiece, the support stand having an arcuate outer surface and a holding hole centered at the center of the arc of the outer surface; a support base comprising a reference portion of wSl received in a recess and a second reference portion having an arcuate outer surface provided at a position facing the reference surface; Apply a force toward the top of the recess along the bisector of the angle formed by the two defined receiving surfaces to the inner circumferential surface of the holding hole on the bisector.

and blocking means for pressing the outer surface of the first datum against the two front surfaces and releasably inhibiting rotation of the support with respect to the base.

(Effect of the invention).

According to the present invention, the first reference part is provided with a holding hole centered at the center of the tension surface of the outer surface thereof, and the pressing force for releasably fixing the support base to the base is applied to the holding hole. Since the pressing force is applied to the inner peripheral surface, the distance from the part of the support base that contacts the base to the part to which the pressing force is applied is significantly shorter than that of a device that applies the pressing force to the outer surface of the shaft of the first reference part. , Therefore, the rotational moment acting on the shaft due to the pressing force is small, and the shaft does not rotate when the support is fixed to the base, and the support is fixed in a posture tilted at the correct angle with respect to the base. can do.

Further, in the present invention, since the first reference part, which is the center of rotation with respect to the base, is fixed, the first reference part does not move with respect to the base, and the support base can be placed in a more correct posture with respect to the base. Can be fixed.

(Example) Embodiments of the present invention shown in the drawings will be described below.

The angle fixing device IO shown in FIGS. 1 to 3 includes a base 14 installed on a workbench 12 such as a surface plate.

It includes a support 16 disposed on the opposite side of the base from the workbench 12 to support the workpiece, and a blocking means 18 for releasably blocking rotation of the support 16 with respect to the base 14.

As shown in FIG. 1, the base 14 has a reference plane 20 and a cross section V.
A letter-shaped recess 22 and a female threaded hole 2 extending from the bottom of the recess.
4 on the side opposite to the workbench 12. The recess 22 is VyI in the illustrated example. Of the two receiving surfaces 26 and 28 that define the V-shaped section of the recess 22, one 26 is flush with the reference surface 20, and the other 28 is inclined at approximately 90 degrees with respect to the receiving surface 26. . Therefore, it is easy to process the reference surface 20 and the receiving surfaces 26 and 28. The internally threaded hole 24 extends along the bisector of the angle formed by the receiving surface 26.28.

As shown in FIG. 1, the support base 16 includes first and second grooves 30.32 having a V-shaped cross section extending parallel to the recess 22, and a first groove 30.32 extending from the bottom of each groove 30.32. 1 and 2nd IF female threaded holes 34 and 36 are provided on the base 14 side. The first recess fM 30 is provided at a position facing the recess 22, and the second recess groove 32 is provided at a position facing the reference surface. The first and second set screw holes 34.36 form two receiving surfaces 38 that define a V-shaped portion of the groove 30.32.
．． It extends in the direction of the bisector of the angle formed by 40, 42, and 44.

The support stand 16 also has a first reference part 46 provided at a position facing the recess 22 and a second reference part 48 provided at a position facing the reference surface 20 at an angle of 12° from the workbench. Be prepared for bias. As shown in FIG. 5, the first reference part 46 is
A first shaft 50 received in the first groove 30, and a first shaft 50 that passes through the first shaft in the diametrical direction and is screwed into the first female threaded hole 34. A female thread 52 is provided. The second reference portion 48 is connected to the second groove 3 as shown in FIG.
2, and a second internal screw 56 that extends diametrically through the second shaft and is screwed into the second set screw hole 36.

As shown in FIG. 4, the first shaft 50 has two holding holes 58 that are open in the end face in the longitudinal direction. The holding/holding hole 58 is centered at the center of the outer surface of the first shaft 5o and has the same diameter.

Note that instead of providing the two holding holes 58 in the first shaft 50, one through hole may be provided in the first shaft 50, and the first and second reference portions 46. 48 is
It may be a protrusion from the base 14, in which case the first
The second reference part 46 has a resilient outer surface, and the first reference part 46 has a holding hole 58 centered on the arc of the outer surface thereof.

The support stand 16 further includes a support section 60 that supports the workpiece.
on the side opposite to the workbench 12. The support 60 includes a support device, such as a magnetic chuck 62 or a bias, attached to the support base 16.

As shown in FIGS. 4 and 7, the blocking means 18 includes two presser shafts 64 inserted into the presser holes 58, and each presser shaft 6.
4 in the diameter direction of the female threaded hole 24 of the base 14.
A cap screw 66 that is screwed into the holder is provided. Each presser shaft 64 is
It has a head 6B having approximately the same radius of curvature as the outer surface of the first reference part 46, that is, the radius of curvature of the first shaft 50, and a shaft 70 concentric with the head. The shaft portion 70 has a diameter slightly smaller than the diameter of the presser hole 58 and is inserted into the presser hole 58 . Each cap screw 66 passes through a hole provided in the shaft portion 70.

Note that, as shown in FIG. 8, one through hole 72 is provided in the first reference portion 46 instead of the holding hole 58.

Instead of using two presser shafts 64, one presser shaft 74 may be used.

When using the angle fixing device 1O, the retaining screw 6 of the blocking means 1B
6 into the female screw hole 24 of the base 14, the presser shaft 64
is the base 1 along the bisector of the angle formed by the receiving surfaces 26 and 28.
4 presses the first shaft 50 against the receiving surface 26,28 of the base 14, thereby preventing the support base 16 from rotating relative to the base 14. On the other hand, when the retaining screw 66 is loosened, the frictional force between the first shaft 50 and the receiving surface 26.28 becomes smaller, so the support base 16 is rotated relative to the base 14, and the support base 16 is rotated relative to the base. The tilt angle can be changed.

In the above-mentioned angle fixing device IO, the pressing force for preventing the rotation of the support stand 16 with respect to the base stand 14 is
Of these, it is applied to the inner peripheral surface portion of the bisector -L of the angle formed by the receiving surfaces 26 and 28 in the direction of the bisector. Therefore, in the device to, the distance from the contact portion of the first shaft 50 with the receiving surface 26.28 to the portion of the first shaft 50 to which the pressing force is applied is such that the pressing force is applied to the first shaft 50. Even if the pressing force is shorter than when applied to the outer circumferential surface, and therefore the direction of the pressing force is inclined with respect to the diametrical direction of the first shaft 50.

The rotational moment acting on the first shaft 50 due to the component force of the pressing force is small, and when the pressing force is applied to the support stand 16, the support stand 16 does not rotate, and the support body 16 is corrected relative to the base stand 14. Can be fixed in position.

In addition, a concave groove 30.32 having a V-shaped cross section provided on the support base 16.
Connect the first and second shafts 50.54 to ■L female threads 52,5.
6, the outer surfaces of the first and second reference parts can be finished with high precision.

The angle fixing device 80 shown in FIGS. 9 to 11 has one presser hole 8 penetrating the first shaft 50 along its central axis.
2 are provided. Further, this device 80 has a first shaft 50
a pair of support plates 84 facing the end faces in the central axis direction;
First and second presser rollers 86 supported by each support plate
, 88, and a threaded rod 90 for moving the presser rollers toward each other and away from each other.

Each support plate 84 is screwed into the base 14 and has a support hole 94 at a position facing the holding hole 82. Each support hole 9
4 is slightly larger than the diameter of presser foot 682, and support hole 9
4 is located closer to the base 14 than the center of the holding hole 82.

The first and second presser rollers 86, 88 have conical heads that are received in the support holes 94 such that the heads face each other. Further, as shown in FIG. 11, the first and second press rollers 86 and 88 are supported by a key 96 on the support plate 84 so that they can slide but cannot rotate. The first and second presser rollers 86, 88 have holes passing through them along their central axes. The hole of the second presser roller 88 is a female threaded hole.

Threaded rod 90 has a head at one end and a thread at the other end. The threaded rod 90 is connected to the first presser roller 86 and the presser hole 82.
and extends through the second presser roller 88 and is screwed into the screw hole of the second presser roller 88 .

When using the angle fixing device 80, the threaded rod 90 of the blocking means 92
By rotating the first and second presser rollers 8
6. When 88 are brought close to each other, the presser rollers 86, 88
The head of the presser contacts the inner surface of the holding hole 82 and presses the first shaft 50 toward the base 14. As a result, the first shaft 50 is pressed against the receiving surface 28.28 of the base 14, and the support base 16 is prevented from rotating relative to the base 14. On the other hand, when the threaded rod 90 is loosened, the first and second presser rollers 86.8
8 are separated from each other, so that the first shaft 50 and the receiving surface 26.2
8 becomes smaller, the support stand 16 can be rotated with respect to the base 14, and the inclination angle of the support stand 16 with respect to the base 14 can be changed.

Ru.

The above-mentioned angle fixing device 80 also has a support base 1 relative to the base 14.
A pressing force for preventing rotation of the holding hole 82 is applied to the bottom portion of the holding hole 82 on the bisector of the angle formed by the receiving surfaces 26 and 28 in the direction of the bisector. For this reason, Sou@aO is
from the contact portion with the receiving surface 26.28 of the first shaft 50
The distance to the part of the shaft 50 to which the pressing force is applied is shorter than when the pressing force is applied to the outer peripheral surface of the first shaft 50, and therefore the direction of the pressing force is the diametrical direction of the first shaft 50. Even if the first shaft 50 is tilted to the opposite direction, the rotational moment acting on the first shaft 50 due to the component force of the pressing force is small, and when the pressing force is applied to the support stand 16, the support stand 16 does not rotate. 16 can be fixed in a correct posture relative to the base 14.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the angle fixing device of the present invention, Fig. 2 is a left side view of the device, Fig. 3 is a plan view of the device, and Fig. 4 is the - ■Cross-sectional view taken along the line, 5th
The figure is a cross-sectional view taken along the V-V line in Figure 3, Figure 6 is a cross-sectional view taken along the Vt-W line in Figure 3, and Figure 7 is a cross-sectional view taken along the ■-■ line in Figure 2. 8 is a sectional view showing another embodiment of the blocking IF means, and FIG. 9 is a sectional view showing an embodiment of the blocking means used in another embodiment of the angle fixing device of the present invention. Front view, Figure 1O is a sectional view taken along line X-X in Figure 9,
11 is a sectional view taken along the X-line in FIG. 9; 12: Workbench, 14: Base, 16 Support stand, 18.92: Blocking means. 20: Reference surface, 22: Recess, 24: Female threaded hole, 26.28: Reception surface, 30.32
: Concave groove, 34, 36: Set screw hole, 38.40,
42, 44: receiving surface, 46: first reference part, 48: second reference part. 50.54: Shaft, 52, 56: City female thread, 58
, 82: Presser hole, 64, 74: Presser shaft. 66: Holder screw, 68: Head, 70: Shaft, 84
: Support plate, 86, 88: Presser roller, 90:
Threaded rod, 94: Support hole. Agent Patent Attorney Nobuyuki Matsunaga Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 T

Claims (7)

[Claims] (1) A base installed on a workbench, which has a reference surface and a recess with a V-shaped cross section on the side opposite to the workbench; a first datum received in the recess, the support being disposed on the side and supporting the workpiece, the support having an arcuate outer surface and a holding hole centered at the center of the arc of the outer surface; and a support base including a second reference portion having an arcuate outer surface provided at a position facing the reference surface, and an angle formed by two receiving surfaces defining a V-shaped cross section of the recess. A force directed toward the top of the recess along the bisector is applied to the inner circumferential surface of the presser hole on the bisector, and the outer surface of the first reference part is pressed against the two receiving surfaces. , blocking means for releasably blocking rotation of the support with respect to the base. (2) The support base has first and second grooves each having a V-shaped cross section extending parallel to the recess of the base, and a V-shaped cross section of the groove extending from the bottom of each groove. first and second setscrew holes extending in the direction of a bisector of an angle formed by two receiving surfaces defining the portion, and the first reference portion is received in the first recess. a first shaft; a first set screw passing through the first shaft in a diametrical direction thereof and being screwed into the first set screw hole to fix the first shaft to the support base; , the second reference part includes a second shaft received in the second recessed groove, passes through the second shaft in a diametrical direction thereof, and is screwed into the second set screw hole. The angle fixing device according to claim 1, further comprising a second set screw for fixing the second shaft to the support base. (3) The angle fixing device according to claim 1 or 2, wherein the receiving surface of one of the recesses of the base is parallel to the reference surface. (4) The base has a cross section V of the recess from the bottom of the recess.
The blocking means has a female threaded hole extending along a bisector of the angle formed by the two receiving surfaces defining the letter-shaped portion, and the blocking means includes:
a head having a radius substantially the same as the radius of curvature of the first reference part; a presser shaft inserted into the presser hole of the first reference part and having a shaft concentric with the head; and a screw passing through the shaft portion in the diametrical direction thereof and being screwed into the female threaded hole.
The angle fixing device according to any one of item 3). (5) The holding hole of the first reference part is a through hole that penetrates the first reference part along the central axis of the first reference part, and the base is formed from the bottom of the recess. a female threaded hole extending along a bisector of an angle formed by the two receiving surfaces defining a V-shaped section of the recess, the blocking means having a presser shaft passing through the through hole; The angle fixing device according to any one of claims (1) to (3), comprising a screw passing through the presser shaft in a diametrical direction thereof and screwed into the female threaded hole. . (6) The holding hole of the first reference part is a through hole that penetrates the first reference part along the central axis of the first reference part, and the blocking means is a through hole that penetrates the first reference part along the central axis of the first reference part. a pair of support plates fixed to the base so as to face the end faces in the axial direction of the base plate, the pair of support plates having support holes at positions facing the through holes; first and second presser rollers having conical heads non-rotatably received and having holes axially extending therethrough;
first and second presser rollers supported by the support plate such that their tops face each other and whose tops are inserted into the through hole; and a screw that passes through the through hole and the first and second presser rollers. Claims 1 to 3 include a threaded rod that moves the first and second rollers toward each other and away from each other. angle fixing device. (7) The angle fixing device according to claim (6), wherein the center of the support hole is located closer to the base than the center axis of the through hole.