JP3394622B2 - XY-axis centering vise for square work - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an XY axial centering vise for a square work, and more particularly to an improvement in a technique for fastening a square work with four fastening jaws.

In the present invention, the "X-axis, Y-axis" means two axes which are orthogonal to each other in a plane, and in the following description, the two directions are the left-right direction and the vertical direction in the plan view.
The case of a book axis is illustrated, but the present invention is not limited to this.

The "square work" to which the present invention is directed
Has four corners at right angles when viewed in a plan view,
Further, it means an article having an outer shape that is line-symmetric with respect to at least one of the X axis and the Y axis passing through the centroid. In the following description, the case of a rectangular parallelepiped is illustrated, but the present invention is not limited thereto.

[0004]

2. Description of the Related Art Conventionally, two feed screws, each having a left-hand threaded portion and a right-handed threaded portion, are used to fasten a rectangular work piece and are orthogonal to each other. The leftward threaded portion and the rightward threaded portion are formed on both sides of the feed screw over substantially the same range. The two feed screws intersect three-dimensionally in the middle of the leftward screw portion and the rightward screw portion.
These feed screws are vertically separated from each other and extend in the X-axis direction and the Y-axis direction in the horizontal plane. Further, each feed screw is rotatable with respect to the frame and is immovable in the axial direction. A pair of fastening jaws are assembled to each feed screw by being screwed into the leftward screw portion and the rightward screw portion. By rotating the feed screw, these fastening jaws slide on the frame to move toward or away from each other. This fastening work is performed manually or automatically, but in any case, it is required to evenly fasten (center) a square work between fastening jaws in the X-axis and Y-axis directions.

In the case of manual operation, each feed screw is rotated in advance to separate the two pairs of fastening jaws from each other, and a rectangular parallelepiped workpiece is set inside the four fastening jaws. Then, first, the feed screws in the X-axis direction are rotated to bring the fastening jaws that come close to each other into contact with the two sides of the square work facing in the X-axis direction to temporarily tighten the square work, and then the Y-axis feed screw is attached. The fastening jaws that are rotated and come close to each other are brought into contact with the other two opposite sides of the rectangular workpiece to temporarily tighten them. Then, the feed screw in the X-axis direction is rotated again to strengthen the fastening of the fastening jaw to the square work, and the feed screw in the Y-axis direction is rotated again. By repeating this operation so that the four fastening jaws uniformly apply the fastening force to each side of the rectangular work, the final fastening of the rectangular work is performed.

In the case of automatic operation, the positions of the fastening jaws in the X-axis and Y-axis directions are detected by a position sensor, and based on the detection signal, the X-axis and Y-axis feed screws are simultaneously driven by appropriate drive mechanisms ( For example, the square work is fastened by being rotated by a geared motor or the like) and finally the four fastening jaws are evenly contacted with the respective sides of the square work.

[0007]

SUMMARY OF THE INVENTION In the case of manual operation,
Since it is necessary to rotate each of the X-axis and Y-axis feed screws little by little while observing the fastening state with respect to the rectangular work, the workability is inevitably deteriorated.
Further, if the temporary fastening by the fastening jaw for the square work in one axial direction is too strong, there will be no slip between the square work and the fastening jaw on the one axial direction side when fastening by the fastening jaw in the other axial direction. So X
It becomes impossible to perform uniform fastening, that is, centering, in both the axial and Y-axis directions.

In the case of automatic operation, it is necessary to install a control system for a drive mechanism, a hydraulic mechanism, a position detection sensor, etc. in the centering vise, which complicates the construction and inevitably increases the equipment cost. In addition, it is necessary to input data regarding the dimensions and fastening force of the rectangular work into the control system.
It becomes complicated in terms of work.

An object of the present invention is to improve workability in fastening a rectangular work, achieve uniform fastening in both X-axis and Y-axis directions, and provide a simple and inexpensive structure.

[0010]

In order to achieve such an object, according to the present invention, a feed screw having a rightward screw portion and a leftward screw portion in the axial direction is rotatable but not movable in the axial direction. The slide block is supported by the frame, and each screw portion is screwed into the frame so as to be slidable in the axial direction (X-axis direction) of the feed screw. The opposite sides of both slide blocks face each other. Incline in the direction away from the feed screw toward the slide block, and
A pair of inclined surfaces extending so as to form an equal angle with respect to the axis of the feed screw are formed, and each one of the four corners of the square work to be fastened is abutted on each inclined surface. The gist is that the fastening jaws that are restrained by the sliding block are slidably engaged with each other on the back surface so that the contact portions of the pair of fastening jaws of the slide block are symmetrical with respect to the axis of the feed screw.

[0011]

When the feed screw is rotated, the pair of slide blocks move relative to each other in the axial direction (X-axis direction) of the feed screw to
Approach a square work placed between a pair of slide blocks. As a result, one of the fastening jaws comes into contact with the side surface in the X-axis direction of the corner portion of the rectangular work, that is, the end portion of one of the two surfaces facing each other in the X-axis direction at a contact portion.
Then, a force in the X-axis direction acts on the fastening jaw. Then, due to the action of the component force in the inclination direction of the inclined surface with which the fastening jaw engages on the back surface, the fastening jaw starts to slide in the direction approaching the rectangular work along the inclined surface. As a result, the fastening jaws move along the Y-axis side surface of the corner of the square work, that is, X
The abutting portion contacts the end of one of the two surfaces that face each other while being separated in the direction orthogonal to the axis. In this way, when the fastening jaw contacts both the X-axis direction side surface and the Y-axis direction side surface of the corner of the square work, the fastening jaw moves the square work along the X-axis direction and the Y-axis direction as the slide block moves. Direction and move to. In this way, finally, all the side surfaces of the four corners of the square work come into contact with the fastening jaws, and the square work is centered in both the X-axis direction and the Y-axis direction, that is, in the X-axis direction. The middle of the two sides that are separated from each other is located on the X axis, and the middle of the two sides that are separated from each other in the Y axis direction is located on the Y axis that passes through the center of the feed screw. Equally tied and restrained.

[0012]

1 to 4, an example of an XY axis direction centering vise of the present invention will be described below. In addition, in FIG. 1 which is a plan view, a feed screw described later extends in the left-right direction,
This axial direction is called the X-axis direction and the vertical direction orthogonal to this is called the Y-axis direction.

The body frame 1 has a substantially rectangular parallelepiped shape,
A guide groove 11 is formed in the central portion in the Y-axis direction so as to extend over the entire X-axis direction. The guide groove 11 has an inverted T-shaped cross section and opens on the upper surface of the main body frame 1. Further, a concave portion 12 which is a seat for receiving a screw holder described later is formed in the central portion of the guide groove 11 in the X-axis direction (see FIGS. 2 and 3). Further, a shaft support member 13 for a feed screw is attached to one end of the main body frame 1 in the X axis direction.

A screw holder 3 for supporting a feed screw is provided at the center of the guide groove 11 of the main body frame 1 in the X-axis direction. As shown in FIG. 2, the screw holder 3 has a base 31 that fits into the central recess 12 of the main body frame 1, and the base 31 is locked to the main body frame 1 by a locking screw 32. That is, a screw hole is formed in the screw holder 3, and the locking screw 3
The screw holder 3 is fixed to the frame 1 by screwing 2 through a through hole formed in the frame 1. A pair of stands 33 are integrally formed on the upper surface of the base 31 so as to be spaced apart in the X-axis direction and project upward. Through holes for passing the feed screws are formed in these stands 33 in the X-axis direction. The screw holder 3 is divided into two in the X-axis direction so that the screw holder 3 and the feed screw 1 can be assembled.

The feed screw 2 is supported by the shaft support member 13 and the screw holder 3 and extends horizontally in the body frame 1 in the X-axis direction so that the feed screw 2 is rotatable with respect to the body frame 1. Has been done. The end of the feed screw 2 protruding from the shaft support member 13 has a hexagonal shape, and the feed screw 2 can be rotated by attaching an appropriate jig to this portion and rotating the jig. The feed screw 2 has a leftward screw portion 21 and a rightward screw portion 22 which are separated from each other in the X-axis direction. As shown in FIG. 1, the feed screw 2 has a small-diameter portion 23 on the left and right and a large-diameter portion 2 in the middle at the center.
4 are formed. In assembling with the screw holder 3, the large-diameter portion 24 of the feed screw 2 is accommodated between the left and right stands 33 of the screw holder 3 via the left and right thrust bearings 25. Is restricted in the X-axis direction. This assembled state is also shown in FIG.

A slide block 4 is screwed into each of the screw portions 21 and 22 of the feed screw 2. Each slide block 4
Are screwed so as to be located at equal distances from the position of the large diameter portion 24 formed in the central portion of the feed screw 2, that is, from the center position of the frame in the X-axis direction. Each slide block 4 includes a base portion 46 and a work rest portion 4.
1 and a base support portion 42. The base portion 46 of the slide block 4 is fitted into the guide groove 11 of the main body frame 1 as shown in FIGS. 2 and 3. The leftward threaded portion 21 and the rightward threaded portion 22 formed on the feed screw 2 have opposite screw directions, and the feed amounts of the slide block 4 per unit rotation of the feed screw 2 are mutually different. Are equal. Therefore, when the feed screw 2 rotates, both slide blocks 4 are guided by the guide groove 11 and move the same distance in the direction toward or away from each other in the X-axis direction.

The upper surface of the base portion 46 of each slide block 4 constitutes a mounting portion 41 on which the end of the rectangular work in the X-axis direction is placed. A mouthpiece support portion 42 is formed extending upward from the mounting portion 41. A pair of mounting surfaces 51 is formed on each of the mouthpiece support portions 42. A lock screw 44 is provided on the attachment surface 51 of each base support portion 42 to fix the base 4
3a, 43b, 43c and 43d are locked respectively. On the front surface of the bases 43a, 43b, 43c, 43d,
A guide groove having a T-shaped cross section is formed. Then, two bases 43a, 4 belonging to the same slide block 4
The bottom surfaces 50 of the guide grooves 3b, 43c, 43d are set so as to extend at equal angles θ to the left and right in the X-axis direction. As a result, each slide block 4 is formed with a pair of inclined surfaces forming an inclination angle θ with respect to the X-axis direction.

A fastening jaw 45 is slidably attached to each of the mouthpieces 43a, 43b, 43c, 43d along the inclined surface thereof. That is, the rear portion of the fastening jaw 45 is slidably fitted in the T-shaped guide groove forming the inclined surface. Further, the fastening jaw 45 is a V-shaped block having an abutting portion for restraining a corresponding corner portion of the rectangular work,
The abutting portion is composed of a member piece 53 that abuts on the side surface of the corner work in the X-axis direction when restraining the corresponding corner portion, and a member piece 54 that also abuts the side surface of the corner work in the Y-axis direction. ing. The member pieces 53 and 54 contact the corresponding corners of the rectangular workpiece via the restraining surfaces 55 and 56, respectively. The inclined surfaces of the pair of caps 43a, 43b, 43c, 43d attached to each slide block 4 are symmetrical with respect to the X axis, and each fastening jaw 45 has the same shape. The positions of the contact portions of the pair of fastening jaws 45 belonging to No. 4 are also symmetrical with respect to the X axis.

Next, the operation will be described with reference to FIG. First, the four corners of the square work W are placed on the work placing portion 41 of the slide block 4 between the left and right slide blocks 4 in the separated state. More specifically, first, with respect to the fastening jaws 45 provided on the mouthpieces 43a and 43c, and also with respect to the fastening jaws 45 provided on the mouthpieces 43b and 43d, the facing restraining surfaces 55, 5 facing each other.
The feed screw 2 is rotated so that the slide blocks 4 are separated from each other so that the interval 5 is larger than the length of the set rectangular work in the X-axis direction. Further, the fastening jaws 45 are provided in the guide grooves so that the distance between the restraining surfaces 56, 56 of the pair of fastening jaws 45 provided on each slide block 4 is slightly larger than the length of the rectangular workpiece in the Y-axis direction. Slide it. After that, the four corners of the rectangular work W are manually placed on the work placement part 41 and set. Then, when the feed screw 2 is rotated in one direction, the left and right slide blocks 4 move toward each other and the fastening jaw 45 approaches the square work W. Since the center of the square work W is set to be displaced from the central portion of the frame 1, as the feed screw 2 is rotated in one direction, first,
Any one of the four fastening jaws 45
Contact the side surface in the X-axis direction of the corner of the rectangular work W on the constraining surface 55 of the member piece 53. Further, when the feed screw 2 is rotated, the fastening jaw 45 receives the reaction force from the square work W via the restraining surface 55. That is, a force parallel to the X axis acts on the fastening jaw 45. On the other hand, since the back surface of the fastening jaw 45 is slidably engaged with the inclined surface of the mouthpiece 43 with the inclination angle θ, when a force in the X-axis direction is applied in this manner, the component force in the θ direction causes the inclined surface to move. Along with this, the fastening jaw 45 starts to slide toward the feed screw 2. At this time, the restraining surface 55 of the member piece 53 slides on the corner of the rectangular work W. Eventually, the restraining surface 56 of the member piece 54 of the fastening jaw 45 comes into contact with the Y-axis direction side surface of the corner portion of the rectangular work W.
As a result, the fastening jaws 45 have the contact surfaces 55,
Both 56 contact the rectangular work W. Further, when the feed screw 2 is rotated, the fastening jaw 45 moves the contact surface 5
The rectangular work W is moved in the X and Y axis directions via 5, 56. At this time, the other fastening jaws 45 also come into contact with the side surfaces of the corners of the rectangular work W in the X-axis direction at the restraint surfaces 55, and when the restraint surface 56 makes contact with the corners in the Y-axis direction, the square work W is moved. Move in the X and Y axis directions. In this way, finally, all of the four fastening jaws 45 hit the side surfaces of the four corners of the square work W and fasten and restrain the square work W. At this time, the rectangular work W moves in the X-axis direction and the Y-direction.
Centered axially. That is, in the rectangular work W, the middle of the two side surfaces in the X-axis direction is located on the axis of the feed screw 2, and the middle of the two side surfaces in the Y-axis direction is located on the Y-axis passing through the center of the feed screw 2. is doing.

At the stage of assembling the vice of the present invention, the Z axis of the left and right slide blocks 4 screwed onto the feed screw 2 (the axis perpendicular to the horizontal plane defined by the X axis and the Y axis).
If there is a discrepancy in the left / right distribution with respect to, that is, the middle between the left and right slide blocks 4 is the frame 1
If it does not match the center of the screw holder, screw holder 3
It suffices to adjust the fixed position of No. 1 with respect to the frame 1 in the X-axis direction. In this case, the through hole formed in the frame 1 for inserting the locking screw 32 may be a long hole in the X-axis direction, and the recess 12 may be formed to have a large length in the X-axis direction. It is desirable that the middle between the left and right slide blocks 4 coincide with the center of the frame 1, but it does not necessarily have to coincide with the center of the frame 1. This is because when the centering vise of the present invention is fixed on the table of a machine tool, the rectangular work W
The center position of the square work W in the fastened state, that is, the coordinates of the intersection point of the diagonal lines of the square work W is found by actual measurement, and this position is stored as the origin in the NC controller. This is because processing work can be executed.

In the above embodiment, the case where the rectangular parallelepiped rectangular work W is fastened has been described, but it is also possible to fasten the T-shaped rectangular work W1 as shown in FIG. Of course, this rectangular work W1 has a symmetry axis 57
Are set along the X-axis direction. The positions of the contact portions of the pair of fastening jaws 45 provided on the slide block 4, specifically, the respective restraining surfaces 55 of the pair of fastening jaws,
It suffices if the position of 56 is symmetrical with respect to the X axis (the axis of the feed screw 2). Therefore, the pair of inclined surfaces provided on the slide block 4 may not be provided at symmetrical positions with respect to the X axis as long as the inclination angles are equal to each other, and one inclined surface may be formed at a position translated in the X axis direction. At this time, the fastening jaw 45 provided on the inclined surface
The amount of protrusion from the inclined surface may be changed according to the amount of movement of the inclined surface.

[0022]

According to the present invention, the centering and fastening of the rectangular work in the X-axis and Y-axis directions can be achieved at the same time by operating (rotating) one feed screw. Therefore, the workability of the centering work is significantly improved as compared with the conventional technique. Further, since only one feed screw is used, it is structurally simpler and less expensive than the conventional two-axis type.

[Brief description of drawings]

FIG. 1 is a plan view showing a centering vise of the present invention in a non-fastened state.

FIG. 2 is a partially sectional side view of the same.

FIG. 3 is an end view of the same.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a plan view showing a state in which a rectangular work is fastened.

FIG. 6 is a plan view showing a T-shaped work fastening state.

[Explanation of symbols]

1 body frame 11 Guide groove 2 Lead screw 21 Leftward thread 22 Rightward thread 25 thrust bearing 3 screw holder 4 slide blocks 41 Work placement section 43a, 43b, 43c, 43d 45 Fastening Joe W square work

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-174360 (JP, A) Actually open 7-20230 (JP, U) Actually open 4-35836 (JP, U) Actually open 53- 67982 (JP, U) Actual Open Sho 53-7899 (JP, U) Actual Open Sho 63-7462 (JP, U) Actual Open Sho 55-103130 (JP, U) Actual Open Sho 52-166884 (JP, U) Jikkou 7-5987 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16H 25/20-25/24

Claims (2)

(57) [Claims] 1. A tool having left and right screw parts whose screw directions are opposite to each other.
Yes, it can rotate with respect to the frame but cannot move axially
A feed screw which is supported lifting the it to each threaded portion of the feed screw
It is screwed together and can be moved in the axial direction by rotating the feed screw.
A pair of slide blocks mounted on the frame
On each side of the slide block,
Be at an equal angle to the lead screw and separate from the lead screw.
1 toward the opposite slide block side
A pair of inclined surfaces and a work rest are formed, and each inclination
The surface of one corner of the square work placed on the work rest
Fastening jaws that abut the side surface and restrain it are installed along the inclined surface.
It is slidably installed on each slide block.
An XY axial centering vise for a square work, wherein the abutting portions of a pair of fastening jaws provided are at symmetrical positions with respect to the axis of the feed screw. 2. A contact portion of each fastening jaw is composed of a member piece that abuts the X-axis direction side surface of a corner portion of the rectangular work piece and a member piece that abuts the Y axis direction side surface when the square work piece is restrained. The centering vise according to claim 1, wherein: