JPS6213220Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a jig that can position a small square piece on the surface of a plate such as a disk with high precision.

For example, two head bases with head tips are attached to a rotating head cylinder of a VTR (video tape recorder), and the mounting positions are precisely positioned on the same diameter line displaced by 180 degrees on the outer circumferential surface of the rotating cylinder. However, an assembly jig is used to position the two head bases at the same time. The present invention relates to an improvement of such an assembly jig.

FIG. 1 is a plan view of a rotating cylinder used in a VTR, and FIG. 2 is a sectional view thereof. In the illustrated rotating cylinder 3, a video tape (not shown) comes into contact with one head chip 1, is guided by the outer circumferential surface of the rotating cylinder 3, and contacts another head chip 1' displaced by 180 degrees. The cable is then pulled out and laid. That is, as shown in FIGS. 1 and 2, this rotating cylinder 3 has head bases 2 and 2' to which the heads 1 and 1' are attached in advance, which are on the diameter line of the rotating cylinder 3 and on the upper surface of the periphery at an angle of 180 degrees with respect to its central axis. They are attached to the displaced positions with screws 4 and 4', respectively. and,
The tolerance a of the mounting position is extremely strict,
The distance on the outer periphery of the rotating cylinder 3 must be within ±several μm. Since this error greatly affects the reliability of the device, it is important to avoid errors in the shape of the rotating cylinder 3, head chips 1, 1', and head bases 2, 2', as well as errors in the shape of the head bases 2, 2, and 2 of the head chips 1, 1'.
Naturally, the error in the position of adhesion to 2' is made to be smaller than the above-mentioned tolerance ± several μm. Note that the holes 5 and 5' are used as positioning holes when using a conventional assembly jig, and are aligned with the center line A-A of the position where the head chips 1 and 1' are assembled.
These are positioning holes of the rotary cylinder 3 that are equidistant from the center axis C-C on the center line B-B of the rotary cylinder 3, which is orthogonal to the center line B-B of the rotary cylinder 3.

FIGS. 3 to 5 are block diagrams of a conventional assembly jig used for assembling head bases 2, 2' to which head chips 1, 1' are bonded in advance to a rotating cylinder 3 as described above. First, this will be explained.

In the figure, reference numeral 7 denotes a pedestal mounted on a workbench, and an inversion base 10 is attached to the top surface of the pedestal, which can be manually rotated 180 degrees about a shaft support 8 by means of a rotary grip 9. This inversion base 10 is the third
It is supported on a pedestal 7 by a protruding portion (not shown) of the pedestal 7, with the front side facing up as shown in the figure, and the back side facing up as shown in FIG.

A through-hole 11 is provided on the surface of the inversion base 10 for fitting and mounting the rotating cylinder 3.
A reference base 14, which is larger than the pass-through window 11, is attached to the rear surface with a gap. A horizontal V-block 6 for positioning the rotary cylinder 3 is fixed to the reference base 14 through a window 11 from the front side of the inversion base 10.

Reference numeral 13 is a toggle clamp for fixing the rotary cylinder 3 by pressing it in a direction perpendicular to the plane of the paper. Its support shaft is supported by a pedestal 13a, and when the handle 13b is pulled up perpendicularly to the plane of the paper, it rotates. The side of the rubber presser plate 13c that presses the cylinder 3 is also pulled up, and by pushing down the handle 13b, the presser plate 13c is pressed from the spindle side, and finally, even in a parallel state, the rotating cylinder 3
This is to press and hold. The structure of this toggle clamp is clearly shown in FIGS. 6 and 7, which will be described later.

Reference numerals 17 and 17' denote a pair of head base positioning clamps, which are rotatably supported around pivot supports 18 and 18' on the inversion base 10, and are used to position the head bases 2 and 2' approximately in the center. It has working shafts 21, 21' protruding inwardly, and support shafts 19, 1 are attached to the reversing base 10.
The open state is maintained by a leaf spring 20 supported by 9'. The working shafts 21, 21' of the clamps 17, 17' are located between the reversing base 10 and the reference base 14, and their respective tips are inclined in opposite directions, as shown in FIG. As shown in the enlarged view, the inclined portions of the working shafts 21, 21' press one corner of the head bases 2, 2' to move them in the horizontal direction in the drawing.

As shown in FIG. 4, the reference base 14 is formed with through-holes 16, 16' having reference surfaces 15a, 15b for positioning the head bases 2, 2'.

This assembly jig is constructed as described above. When fixing the head chip to the rotating cylinder, the inverted base 10 is first placed on the stand 7 with its surface facing up, and the rotating cylinder 3 is inserted between the inverted base 10 and the toggle clamp 13 with the toggle clamp 13 being opened.
The positioning holes 5, 5' of the rotating cylinder 3 are fitted with pins 1
In this state, the side of the rotating cylinder 3 is pressed against the groove of the V-block 6, and the toggle clamp 13 is operated to rotate the rotating cylinder 3.
is pressed and held on the reference base 14.

Next, the inversion base 10 is inverted as shown in FIG. ,2
Push one corner of the head base 2, 2' with the slope part of 1', slide it in the horizontal direction using the reference surface 15a of the pass-through window 16, 16' as a guide, and press the other reference surface 1.
The head base 2, 2' is positioned at 5b. In this state, head base 2,
Machine screws 4, 4' are inserted into the screw holes machined in 2' and fixed to the rotary cylinder 3 by tightening them. Thereafter, by turning over the reversing base 10 and manually opening the head base clamps 17, 17' and the toggle clamp 13, the rotating cylinder 3 with the head bases 2, 2' assembled can be taken out.

However, according to the jig having the structure described above, the head bases 2, 2' to be assembled to the rotating cylinder 3 cannot be easily assembled.
Because of the structure in which the inclined parts of the work shafts 21, 21' of the head base clamps 17, 17' are pressed against one corner for positioning, there is a point contact, and the head base may tilt or roll over during the pressing operation, making it difficult to accurately I couldn't determine the position. Also, holes 5 and 5' for positioning the rotating cylinder 3 are provided.
The gap between the rotary cylinder 3 and the pins 12 and 12' caused the rotary cylinder 3 itself to be misaligned, making it impossible to assemble the head base with high precision.

An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a jig that can position the square piece as described above with high precision.

The present invention is a jig for positioning a square piece to an object to be assembled that is positioned at a predetermined position on a flat plate, and a jig for guiding the square piece to the flat plate and stopping it at a predetermined position. An operating rod is attached to the flat plate and is rotatable in parallel with the flat plate surface; comprising an L-shaped pressing piece that comes into contact with two adjacent sides of the piece, and a tensioning means that pulls one piece of the pressing piece toward the operating rod,
By inserting a square piece into the opening and rotating the operating rod, the square piece is pressed against one reference surface of the flat plate opening with the inner surface of one piece of the L-shaped pressing piece. Then, the inner surface of the other piece is pressed against the other reference surface for positioning, thereby achieving the above object.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 6 to 9. FIG. 6 corresponds to the above-mentioned FIG. 3, and FIG. 7 is a partially omitted side view of the same. Further, FIG. 8 shows a state in which the inversion base shown in FIG. 6 is inverted. Furthermore, the ninth
The figure is an enlarged view of the main part of FIG.

Rotating cylinder 3 used in this example
is a groove 22 in which a rotation stopper bar engages with a circumferential portion of the rotary cylinder 3 on line A-A shown in FIG.
is formed.

In FIG. 6, the reversing base 30 is reversible on the pedestal 27 about the pivot support 28, and 29 is a grip for operating it.
A horizontal V block 31 and a toggle clamp 33 are attached to the surface of the reversing base 30 for positioning and holding the rotary cylinder 3 in a predetermined position. Furthermore, V block 31
A protrusion bar 32 for stopping rotation of the rotary cylinder 3 in the circumferential direction is passed through the center thereof, and an arrow-shaped protrusion 34 is formed at the tip of the protrusion bar 32. It is adapted to engage with a groove 22 formed on the circumferential side of the rotating cylinder 3. 35 is a spring fitted around the protrusion rod 32 inside the V-block 31. 36 indicates the protrusion bar 32 when the protrusion bar 32 is not used.
This is a stopper for storing the V-block 31 in the V-block 31.
It is rotatable to the protrusion rod 32 side about a.
Note that 37 is a handle to be held when pulling out the protrusion rod 32.

The toggle clamp No. 33 has the same function as the one shown in FIG. 3 above, and as shown in FIG.
A clamp shaft 38 is pivotally attached to the handle 23, and
The handle 23 side is connected to a base 33a by a connecting rod 39. A leaf spring 41 is attached to the clamp shaft 38 by a bolt 40.
A circular presser plate 4 with a rubber plate 43 glued to its lower surface.
2 is installed. This toggle clamp 33 is
When the handle 23 is pulled up, the holding plate 42 is pulled up by the link mechanism between the handle 23, the clamp shaft 38, and the connecting rod 39, and the inversion base 3
A space is created between the V-block 31 and the toggle clamp 33, and the rotary cylinder 3 is interposed therein, and by pushing down the handle 23, the holding plate 42 is pushed down, and the state shown in FIG. 7 is maintained. It is possible.

In addition, the reversing base 30 is provided with figures 8 and 9.
As shown in the figure, through-holes 46, 46' are opened to form two reference surfaces for positioning the head bases 2, 2' on the rotary cylinder 3. 47
is a head base clamp for pressing and positioning the head bases 2, 2' at predetermined positions on the rotating cylinder 3, and is attached to the reversing base 30. That is, as shown in the enlarged view of FIG.
5 as a pivot in the directions of arrows E and D. Further, the clamp shaft 47a has protrusions 48, 48' formed on the upper and lower parts of the clamp shaft 47a, centering on the fulcrum shaft 55, and an L-shaped press at the end that can rotate about the pins 52, 52'. The pieces 45, 45' are mounted so as to be located within the aforesaid windows 46, 46'.
Further, springs 56, 56' are provided between the pressing pieces 45, 45' and the clamp shaft 47a.
is stretched, and is normally located at the position indicated by the broken line in Figure 9. Further, a spring 51 is provided between the clamp shaft 47b side and the metal fitting 24 fixed to the inversion base 30.
The clamp shaft 47a is normally pulled in the direction of arrow D.

A method of using the square piece assembly jig constructed as described above will be described below.

First, as shown in FIG. 6, the inversion base 30 is placed with the toggle clamp attachment side facing upward, the handle 23 of the toggle clamp 33 is pulled up to lift the presser plate 42, and the rotary cylinder 3 is placed on the inversion base 30.
In this case, the protrusions 34 of the protrusion rods 32 are fitted into the grooves 22 of the rotary cylinder 3, and the outer peripheral surface of the rotary cylinder 3 is placed in contact with the grooves of the V block 31 for positioning. And the handle 23 of the toggle clamp 33
is pressed down, and while pushing the rotary cylinder 3 toward the V-block 31 side using the holding plate 42, it is pressed from the upper surface to fix it. In this state, the grip 29 is operated to invert the inversion base 30 as shown in FIG.

Therefore, by operating the handle 47a of the head base clamp 47, the arrow E is pressed against the spring 51.
direction to widen the gap formed by the L-shaped pressing pieces 45, 45' and the through-holes 46, 46'. The head bases 2, 2' are inserted therein, and one side of the head bases 2, 2' is placed against the inner wall of the windows 46, 46'. Thereafter, the clamp shaft 47a of the head base clamp 47 is gradually returned together with the tensile force of the spring 51, and moved in the direction of arrow D. At this time, the L-shaped pressing pieces 45, 45' are in the position indicated by the broken line in the initial state, but by performing the above-mentioned operation, the inner wall of one of the pressing pieces 45, 45' is pressed against the head bases 2, 2. ' is pushed in the direction of the arrow, and it comes into contact with the inner wall of the windows 46, 46'. Furthermore, when the clamp shaft 47a is rotated, the respective pressing pieces 45, 45' are moved to the pin 52,
It rotates about 52' as a fulcrum and takes a position as shown by the solid line against the springs 56, 56'. When the head bases 2, 2' are further rotated, the head bases 2, 2' are moved in the direction of the arrow by the inner wall of the other pressing piece 45, 45', and are housed in the predetermined position shown in FIG. Therefore, although not shown in the figure, screws are passed through the screw holes of the head bases 2 and 2', and the head bases 2 and 2 are inserted into the rotary cylinder 3 as shown in FIG.
2' is fixed. In that case, head base 2,
2' is a spring 5 tensioned on the clamp shaft 47b.
Since this state is maintained by pulling the head base clamp 47, there is no need to hold the head base clamp 47, and both hands can be used to tighten the screws.

After the head bases 2, 2' have been assembled, the reversing base 30 is returned to the position shown in FIG. The rotating cylinder 3 can be taken out by performing an opening operation.

In this way, in the above embodiment, in order to position the two head bases with high precision on the circumference passing through the center of the rotating cylinder, two openings are formed in the flat plate, and the inner walls of the openings are used to guide the head bases. The head base is also used as a reference plane, and the positioning and pressing mechanism for the head base is such that at the initial stage of operation, an L-shaped pressing piece presses the head base against one inner wall of the opening, and then it is pushed out to a predetermined position. . Therefore, unlike the conventional method in which an inclined part is formed at the tip of a part of the head base clamp and the inclined part is pressed against one corner of the head base for positioning, the head base does not roll over during operation. It can be reliably assembled in the specified position. Additionally, the positioning and locking mechanism for the rotating cylinder includes a V block on a flat plate that stops rotation in the horizontal direction, a protrusion rod that is attached integrally with the V block to stop rotation, and a bar that stops movement in the vertical direction. Since it is also equipped with a clamp mechanism, the rotating cylinder can be positioned with high precision.

Naturally, the present invention is not limited to the above-mentioned embodiments, but also applies to assembling a single square piece to an object to be assembled, and assembling two square pieces on the same straight line. It can be applied to a wide range of things.

As is clear from the above embodiments, the mechanism for positioning the square piece to the object to be assembled according to the present invention uses an L-shaped pressing piece to press two sides of the square piece;
Moreover, since this is performed by a two-step operation, the square piece can be positioned reliably, the positioning accuracy is greatly improved, and furthermore, there are advantages and effects such as good workability.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a rotating cylinder, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIGS. 3 to 5 are diagrams showing the configuration of a conventional square piece positioning jig. Figure 3 is a partly omitted plan view showing the inverted base with the rotary cylinder positioned face up;
The figure is a partly omitted plan view showing the inverted state of the inversion base, FIG. 5 is a partially enlarged view of FIG. 4, and FIGS. 6 to 9 are views showing one embodiment of the present invention. hand,
Figure 6 is a partly omitted plan view showing the reversing base with the rotary cylinder positioned face up, Figure 7 is a partly omitted front view of Figure 6, and Figure 8 is a partially omitted plan view of the reversing base with the rotating cylinder turned over. FIG. 9 is a partially omitted plan view showing the state in which the device is in the same state as shown in FIG. 2, 2'... Head base, 3... Rotating cylinder, 30... Inversion base, 31... V block, 32... Protrusion bar, 34... Protrusion, 35,5
1, 56, 56'... Spring, 45, 45'...
...L-shaped pressing piece, 46, 46'... Pass-through window, 47
... Head base clamp, 47a... Clamp shaft, 48, 48'... Protrusion, 52, 52'... Pin, 55... Fulcrum shaft.

Claims (1)

[Claims for Utility Model Registration] 1. A jig for positioning a square piece on an object to be assembled which is positioned at a predetermined position on a flat plate, the jig being a jig for positioning a square piece on the flat plate and guiding the square piece to a predetermined position. an opening formed with two reference surfaces for stopping the plate in the position, an operating rod attached to the flat plate and rotatable parallel to the flat plate surface; It includes an L-shaped pressing piece that comes into contact with two adjacent sides of a square piece inserted into an opening formed in a flat plate and presses them, and a tensioning means that pulls one piece of the pressing piece toward the operating rod. , by inserting a square piece into the opening and rotating the operating rod, the square piece is placed on one reference surface of the flat plate opening with the inner surface of one piece of the L-shaped pressing piece. 1. A positioning jig for a rectangular piece, characterized in that the jig is configured to press the square piece, and then press the inner surface of the other piece against the other reference surface for positioning. 2. The object to be assembled with square pieces positioned at predetermined positions on a flat plate has a disk shape, and two square pieces are positioned on the outer peripheral surface displaced by 180 degrees around the diameter line of the disk. The flat plate has an opening formed with two reference surfaces for guiding and restraining the two square pieces in a predetermined position, and The operating rod for pressing and positioning is rotatably attached to a flat plate with the center of the disk as a pivot, and L-shaped pressing pieces are pivoted in opposite directions at positions equidistant from the pivot of the operating rod. By inserting the square piece into the opening and rotating the operating rod, the two square pieces can be simultaneously positioned at a position on the outer peripheral surface of the disk displaced by 180 degrees. A positioning jig for a rectangular piece as set forth in claim 1 of the utility model registration claim characterized by the structure.