JP3046243B2 - Plug press-in device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an apparatus for press-fitting a plug such as a blind plug into an opening such as a hole formed in a work.

[0002]

2. Description of the Related Art Conventionally, as a device for press-fitting a plug such as a blind plug into an opening of a work, there is known a press-fit device as shown in FIG. The press-fitting device includes a substrate 51 disposed above the workpiece W, a holder 52 on the lower surface side of the substrate 51, which is mounted in alignment with the plug insertion hole 51a, and a held cone plug. A press-fitting tool 53 for press-fitting the P is provided.
Then, the plug P supplied through the plug insertion hole 51a is held by the holder 52, and the press-in tool 53 is lowered from above and press-fitted.

At this time, a plurality of works W are clamped on a concentric circle, and plugs P,.
, The work W is index-rotated around the central axis. Holder 5
2 includes four spring pins 54 for holding the plug P,
Are fixed by a fixing member 55. The spring pins 54,... Are extended downward from all sides and then bent downward to hold the plug P at the center. When the plug P is supplied to the holder 52 after the work W is positioned, the press-fitting tool 53 descends from above and presses the plug P toward the press-fitting portion Wa to press-fit. When the press-fitting is completed. Then, the work W is rotated by the index so that the next press-fitting portion Wa faces below the holder 52, a new plug P is supplied, and press-fitting is sequentially repeated.

[0004]

However, in the case of the conventional device, since the plug P is held by the four spring pins 54,..., It is difficult to center the press-fitting. When the second plug P is to be press-fitted into a place where the plug P has already been press-fitted, the second plug P remains hooked on the spring pin 54, and the work W is index-rotated in this state. Then, the spring pin 54 is bent by the plug P, and cannot be held even if the plug P is supplied next time.

[0005] Therefore, the centering of the plug P is ensured and smooth plug press-fitting is performed, and even if the plug P is accidentally hit twice,
A technology that does not affect the function of the device has been desired.

[0006]

According to the present invention, in order to solve the above-mentioned problems, according to the present invention, a holding tool for holding a plug, and a press-fitting tool for press-fitting the plug held by the holding tool into a press-fitting portion of a work. In a plug press-fitting device provided with a main body, as a holding tool, a main body arranged close to the press-fitting portion of the work, and a main body supported by an elastic body, and arranged at a predetermined distance from the press-fitting portion and provided in a predetermined direction in the press-fitting direction. A holding body that can move in a stroke is provided, a holding hole is formed in the holding body to engage with an outer surface of the plug to hold the plug, and the holding tool is moved together with the plug in a predetermined stroke press-fitting direction when the plug is press-fitted. After that, when the plug is disengaged from the holding hole, the elastic body returns to the original position by the restoring force.

[0007] The plug is held by the holding hole of the holding body, and the plug is pushed in and pressed in. At this time, the holding body is moved by a predetermined stroke in the pressing-in direction by the engaging force, so that the plug is initially pressed in. Hold to a position close to the stage for smooth press fitting. Then, if the holder is returned to the original position by the restoring force of the elastic body after the plug comes out of the holding hole, the interference between the plug and the holder can be suppressed.

When the plug is engaged with the holding hole,
An engagement member such as an O-ring or a C-ring may be provided on the inner peripheral surface of the holding hole, or the diameter of the holding hole may be reduced so that the inner surface of the holding hole is engaged with the outer surface of the plug by frictional resistance. Or by other means. If the elastic force of the elastic body supporting the holding body is made weaker than the engaging force between the plug and the holding hole, the holding body is moved while the plug is held in the holding hole when a pressure input is applied to the plug. Can be done. Further, a member such as a stopper is used as necessary in order to regulate the movement stroke of the holding member to a predetermined value.

According to a second aspect of the present invention, the predetermined distance between the holding body and the press-fitting portion of the work is at least equal to or longer than the length of the plug and equal to or longer than a predetermined stroke in the press-fitting direction of the holding body. Until the press-fit portion is reached and engaged, the engagement between the plug and the holding hole is maintained, and the plug and the holding hole are disengaged shortly before the press-fitting starts.

Here, if the distance between the holder and the press-fitting portion of the work is at least longer than the length of the plug, for example, when the plug is hit twice, when the holder returns to the original position, There is no situation in which the plug is caught between the holding body and the press-fitting portion. For example, no trouble occurs even if the work is index-rotated thereafter. If the distance between the holding body and the press-fitting portion of the work is set to be equal to or longer than the moving stroke of the holding body, they do not interfere with each other during the press-fitting. Furthermore,
Until the tip of the plug reaches the press-fitting part of the workpiece at the time of press-fitting, the engagement between the plug and the holding hole is maintained, and if the plug and the holding hole are released before the press-fitting starts, the centering of the plug is performed. Can be performed accurately, and even when the plug is hit twice, for example, the plug comes out of the holding hole,
The empty holder can be reliably returned to the original position.

According to a third aspect of the present invention, the holder is provided with checking means for checking the presence or absence of a plug in the holding hole. Then, for example, if a photoelectric sensor is used as the checking means and the operation of the press-fitting tool is controlled by a detection signal of this sensor, it is possible to prevent idle hit.

[0012]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a sectional view of a main part of the press-fitting device, FIG. 2 is a plan view of a holder, and FIG.
FIG. 4 is a sectional view taken along the line A, and FIG.

The plug press-fitting device 1 of the present invention is configured as a device for press-fitting cone plugs P,... Into press-fitting parts Wa,. As shown in FIG. 1, a plurality of works W are clamped on a table (not shown) rotatable around an index axis R, and a plug P is sequentially press-fitted into each press-fitting portion Wa while rotating the index table. I'm going to go.

A substrate 3 as a main body is provided above a predetermined height from the upper surface of the workpiece W. While being provided at a predetermined distance away,
A press-fitting tool 5 is provided above the holding tool 2 so as to be vertically movable. A supply path 6 for supplying the plug P toward the holder 2 is provided on the upper surface of the substrate 3.
Is provided with a sensor 7 for confirming the passage of the plug P.

As shown in FIGS. 2 and 3, the holder 4 of the holder 2 is supported on the substrate 3 by four springs 8 as elastic bodies.
.. Can be moved downward by a predetermined stroke with respect to the substrate 3, and a holding hole 4a is provided at the center.

The diameter of the holding hole 4a is slightly larger than the large diameter portion of the plug P, so that the plug P can pass through with little resistance.
An O-ring 10 is provided in a. And this O
The ring 10 is adapted to be able to engage with the outer peripheral portion of the intermediate portion of the plug P. Therefore, when the plug P is supplied from the supply path 6 into the holding hole 4a, the plug P falls down and is engaged and held by the O-ring 10.

The engaging force of the O-ring 10 is made stronger than that of the springs 8,..., And when the plug P held by the O-ring 10 is pressed downward, the springs 8,. I have. The amount of the stroke in which the springs 8,... Are contracted and the holding body 4 moves downward is regulated by the stopper 9 within a stroke range shorter than the interval t between the lower surface of the holding body 4 and the press-fitting portion Wa, which will be described later. When the pressing force is further applied to the plug P after the holding body 4 contacts the stopper 9, the plugs P and O
The ring 10 is disengaged.

When the plug P is press-fitted, the O-ring 1 is kept until the lower end of the plug P reaches the press-fitting portion Wa and engages with it.
0 and the plug P are kept engaged, and O
The engagement between the ring 10 and the plug P is released. For this reason, the distance s between the O-ring 10 and the press-fitting portion Wa when the holding body 4 is lowered by a predetermined stroke (FIG.
(A)) is slightly shorter than the length of the plug P. By doing so, the centering of the plug P can be accurately performed, and even if the plug P is hit twice, for example, in a place where the plug P is already press-fitted, the plug P immediately after the lower end of the plug P reaches the press-fitting portion Wa. Can be reliably removed from the holding hole 4. The O-ring 10 as described above is
A C-ring may be used, or the diameter of the holding hole 4a may be reduced to hold the plug P by frictional resistance on the inner surface, or by other means.

The photoelectric sensor 11 is provided in the holding hole 4a.
Is facing. The photoelectric sensor 11 checks the presence or absence of the plug P in the holding hole 4a, and controls the operation of the press-fitting tool 5 based on the detection signal.

As shown in FIG. 3, the distance t between the lower surface of the holder 4 and the press-fitting portion Wa is longer than the length of the plug P, and is longer than the lowering stroke of the holder 4. Therefore, for example, when the holding member 4 is restored and rises to the original position after hitting the plug P twice, a problem that the remaining plug P is caught between the lower surface of the holding member 4 and the press-fit portion Wa. In addition, there is no problem that the lower surface of the holding body 4 comes into contact with the upper surface of the work W at the time of press-fitting.

The above-described double strike will be described with reference to FIG. As shown in FIG. 4A, when the plug P is supplied into the holding hole 4a and pressed by the press fitting 5, the holding body 4 moves downward together with the plug P while contracting the springs 8,. When the holding member 4 moves by a predetermined stroke, the holding member 4 cannot be further lowered by the stopper 9, and
Thereafter, the plug P starts coming out of the O-ring 10.

Finally, the plug P is connected to the O-ring 10
And the plug P is disengaged from the holding hole 4a, but the position where the plug P exits the O-ring 10 is immediately after the lower end of the plug P reaches the press-fitting portion Wa. For this reason, FIG.
As shown in (B), at the time when the lower surface of the plug P being press-fitted comes into contact with the upper surface of the plug P already driven, the plug P being press-fitted surely comes out of the holding hole 4a and is in a free state. Further, the holding body 4 has returned to the original position in a state where the engagement with the plug P is released and the pressing force is eliminated. In addition, since the distance t between the lower surface of the holding member 4 and the upper surface of the press-fitting portion Wa is longer than the length of the plug P, the upper surface of the plug P and the lower surface of the holding member 4 are separated from each other.

Therefore, even if the workpiece W is rotated next by the index, the plug W and the holder 4 do not interfere with each other.
No trouble.

[0024]

As described above, in the present invention, the main body is provided with the holding member supported by the elastic body, and the holding member is engaged with the outer surface of the plug to hold the plug. In order to form the holding hole and to move the holding body in a predetermined stroke press-fit direction at the time of press-fitting the plug, and then, when the plug comes out of engagement with the holding hole, the elastic body returns to the original position by the restoring force. The press-fitting of the plug can be performed smoothly, and the holding body is returned to the original position after the press-fitting. Therefore, even if there is a problem with the press-fitting of the plug, interference can be avoided. By setting the interval between the holding body and the press-fitting portion of the work and the timing at which the engagement between the plug and the holding hole is released to a predetermined interval and timing, as in claim 2,
In particular, it is possible to prevent the occurrence of a defect in a situation such as a double strike. Further, if a checking means for checking the presence or absence of the plug in the holding hole is provided as in claim 3, it is possible to prevent a problem such as performing an empty shot.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of the press-fitting device.

FIG. 2 is a plan view of a holder.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an operation diagram of a double-hit state of a plug.

FIG. 5 is a conventional view of a holder.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Press-fitting device, 2 ... Holder, 3 ... Board, 4 ... Holder, 4
a: holding hole, 5: press-in tool, 8: spring, 9: stopper, 10: O-ring, t: interval, P: plug, W: work, Wa: press-fit portion.

Claims (3)

(57) [Claims] 1. A plug press-fitting device comprising: a holding tool for holding a plug; and a press-fitting tool for press-fitting a plug held by the holding tool into a press-fitting portion of a work. A main body disposed in close proximity to the portion, and a holding body supported by an elastic body on the main body and arranged at a predetermined distance from the press-fitting portion and movable by a predetermined stroke in the press-fitting direction. A holding hole is provided for holding the plug by engaging with the outer surface of the plug. When the plug moves in a predetermined stroke press-fit direction together with the plug during press-fitting, and thereafter the plug comes out of engagement with the holding hole, the restoring force of the elastic body A press-fitting device, wherein the plug press-fitting device returns to its original position. 2. The plug press-fitting device according to claim 1, wherein the predetermined interval between the holding body and the press-fitting portion of the work is at least equal to or longer than the length of the plug and equal to or longer than a predetermined stroke with respect to the press-fitting direction of the holding body. Further, the plug and the holding hole are maintained in engagement with each other until the plug tip reaches and engages with the press-fitting portion of the workpiece at the time of press-fitting, so that the plug and the holding hole are disengaged immediately before the press-fitting starts. A plug press-fitting device characterized by the above-mentioned. 3. The plug press-fitting device according to claim 1, wherein the holder has a check unit for checking the presence or absence of a plug in the holding hole.