JPH047858Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floating mechanism of an assembly device for assembling a second member to a first member.

[Conventional technology]

When assembling the second member to the first member using a robot or the like, the second member must first be placed in an accurate position relative to the first member. For example, when the first member is a connecting rod main body and the second member is a metal to be attached to the large end of the connecting rod main body, extremely high precision is required in the attachment positional relationship between the connecting rod main body and the metal.

If high precision is required in the arrangement of the first member and the second member, an extremely expensive robot is required to achieve high precision, and careful work is also required. Therefore, the cost increases significantly and it takes time and effort.

In order to solve such problems, floating mechanisms for assembly devices have been proposed. The floating mechanism of the assembly device is a mechanism in which the holding member holding the second member is kept in a floating state with respect to the first member, and the holding member contacts the first member. The precise position of the holding member with respect to the first member is determined at the moment when the holding member is held, thereby accurately positioning the second member with respect to the first member.

As a prior art document disclosing a floating mechanism of an assembly device, for example, Japanese Patent Application Laid-Open No. 1987-
211433, JP-A-55-137853 or JP-A-56-
There are 62738.

[Problem that the invention attempts to solve]

By the way, when assembling metal to the connecting rod body of an engine, for example, it is impossible to use the floating mechanism described in the above-mentioned prior art documents. This is due to the following reason.

Fig. 4 is a perspective view of the conrod of the engine, 1 is the conrod main body, 2 is the conrod main body 1
The metal 2 is attached (press-fitted) to the large end 3 of the metal 2, but the metal 2 must be accurately aligned with the large end 3 in both the arrow PP direction and the arrow QQ direction. The floating mechanisms described in the above-mentioned prior art documents are all for assembling a cylindrical object into a hole, but when assembling the metal 2 to the connecting rod body 1 of the engine, the metal 2 has a planar projection shape. Since it is rectangular, it must be accurately aligned with the large end 3 of the connecting rod main body 1 in the front, rear, left and right directions. Therefore, it is not possible to use a simple floating mechanism in which a cylinder is assembled into a hole as it is. This is the reason why the floating mechanism described in the above-mentioned prior art document cannot be used when assembling the metal 2 to the cooking rod body 1 even if it is attempted to be used.

At present, no floating mechanism has been proposed for accurately positioning and assembling a second member (for example, metal) to a first member (for example, a connecting rod main body) in the longitudinal and lateral directions.

The present invention solves these problems of the conventional technology.

The technical problem of the present invention is to provide a floating mechanism that can be used when accurately positioning and assembling a second member (e.g., metal) to a first member (e.g., a connecting rod body) in the front, rear, left, and right directions. It is in.

[Means for solving problems]

In order to achieve this technical problem, the following measures are taken in the present invention.

That is, the floating mechanism of the assembly device according to the present invention is the first floating mechanism located below.
A floating mechanism used in an assembly device for assembling a second member onto the member from above, the floating mechanism comprising a top plate whose position is fixed relative to the first member during the assembly work, and , holding means for holding the second member and assembling the second member to the first member;
a drive plate to which the holding means is attached and which is displaceable with respect to the flat plate; and a drive plate which is attached to the top plate and which displaces the drive plate with respect to the top plate; and a driving means for moving the rod toward the member, the holding means comprising a hanging rod body, a pressing member fixed to the hanging rod body, and a pressing member attached to the hanging rod body. the second member against the first member by holding the second member and abutting the first member;
a left-right positioning member for positioning the member in the left-right direction; and a left-right positioning member that is attached to the hanging rod main body and that moves the second member forward and backward relative to the first member by coming into contact with the first member. The suspension rod body is composed of a front-rear positioning member for positioning the rod, and the suspension rod body includes a suspension rod extending upward, and a suspension rod located below the suspension rod and integrally fixed to the suspension rod. the suspension rod is loosely fitted into a through hole formed in the drive plate, and a compression coil spring is disposed between the drive plate and the base; The base portion and the drive plate are connected by a cable, and the entire holding means is suspended from the drive plate by the cable.

[Effect]

In the present invention, the holding means holding the second member is provided with a front-back positioning member 34 and a left-right positioning member, each of which is aligned with the first member, thereby The position of the second member relative to the first member in the longitudinal and lateral directions is accurately determined.

On the other hand, in the present invention, the holding means holding the second member is suspended by a cable, and the hanging rod is loosely fitted into the through hole, so that there is no connection between the through hole and the hanging rod. The holding means can freely move forward, backward, left and right by the distance between the two.

Therefore, even if there is a misalignment between the second member and the first member, as long as the longitudinal positioning member and the left-right positioning member are aligned with the first member, The position of the second member can be accurately determined both in the front, rear, left and right directions.

Thus, according to this embodiment, the second member can be accurately positioned and assembled to the first member in the front, rear, left and right directions.

〔Example〕

FIG. 1 is a side view of a floating mechanism of an assembly device according to an embodiment of the present invention.

The one in Figure 1 is the engine conrod body 1.
The metal 2 is assembled to the large end 3 of the metal 2.

In FIG. 1, 4 is a bolt provided at the large end 3. After the metal 2 is assembled, a cap (not shown) is fixed to the bolt 4 with a nut (not shown), thereby completing the cooking stove.

FIG. 2 is a longitudinal sectional view of a floating mechanism of an assembly device according to an embodiment of the present invention.

In FIG. 2, 11 is a top plate. Top plate 11
is attached to a robot (not shown). An air cylinder 15 is attached to the top plate 11, and a rod 16 extends from the air cylinder 15. The tip of the rod 16 is fixed to a drive plate 21. A holding means 12 holding the metal 2 is attached to the drive plate 21.

The metal 2 is held by being attracted to the left-right positioning member 33 of the holding means 12 by negative pressure.

When the air cylinder 15 is driven and the rod 16 is lowered, the drive plate 21 is also lowered, so the holding means 1
2 also goes down. By lowering the entire holding means 12, the metal 2 is assembled to the large end 3 of the connecting rod body 1.

Since guides (not shown) are provided between the top plate 11 and the drive plate 21, one each in the front and back direction (arrow P-P), the drive plate 21 can move accurately with respect to the movement of the rod 16. .

The holding means 12 includes a hanging rod body 31,
A pressing member 32, a left-right positioning member 33,
It is composed of a longitudinal positioning member 34.

The suspension rod body 31 is composed of an upwardly extending suspension rod 35 and a base portion 30 located below the suspension rod 35 and integrally fixed to the suspension rod 35. A compression coil spring 69 is provided between the drive plate 21 and the base 30.
is located.

The inside of the hanging rod 35 is hollow. A through hole 36 is bored in the drive plate 21, and the hanging rod 35 passes through the through hole 36 and extends toward the top plate 11. Through hole 36
The inner diameter of the suspension rod 35 is larger than the outer diameter of the suspension rod 35. Therefore, the hanging rod 35 is loosely fitted into the through hole 36.

The tip of the hanging rod 35 is a conical part 4
It is said to be 1. The top plate 11 is provided with a conical storage section 42 that removably stores the conical section 41.

The hanging rod main body 31 and the pressing member 32 are fixed with bolts 44. Pressing member 32
A left-right positioning member 33 is attached.
That is, from the left-right positioning member 33, the rod 4
3 extends upward, and the rod 43 is the pressing member 3.
2 and extends upward through a through hole 48 formed in the hole 2. An enlarged portion 45 is provided at the tip of the rod 43, and the left-right positioning member 33 is suspended from the pressing member 32 by the enlarged portion 45.

The left-right positioning member 33 has a first role of holding the metal 2. As described above, the metal 2 is held by being attracted to the left-right positioning member 33 by negative pressure. 45 is a negative pressure passage, and 46 is a negative pressure introduction port.

The second role of the lateral positioning member 33 is to position the metal 2 with respect to the large end 3 of the connecting rod body 1 in the lateral direction, that is, in the direction perpendicular to the plane of the paper. A portion designated by the reference numeral 51 is a portion for positioning the metal 2 in the left-right direction, that is, in the direction perpendicular to the plane of the paper.

The longitudinal positioning member 34 is attached to the hanging rod main body 31 so as to be slidable in the vertical direction. This is linear motion bearing 5
This is realized by 2. The linear motion bearing 52 is located at the base 3 of the hanging rod body 31.
It is housed in a bearing housing 53 that is fixed at 0.

A nut 54 is mounted on the longitudinal positioning member 34.
The collar 55 is fixed by the collar 5.
5, the longitudinal positioning member 34 is suspended from the bearing housing 53.

The longitudinal positioning member 34 is arranged in the longitudinal direction of the metal 2 with respect to the connecting rod main body 1, that is, in the direction of the arrow P-P.
This is for directional positioning. The front-back positioning members 34, one in the front-back direction (P-P direction), are connected by a connecting member 61 in order to keep the distance between them constant.

A groove 62 that matches the bolt 4 of the connecting rod body 1 is bored in the longitudinal positioning member 34 . By aligning the groove 62 with the bolt 4 of the connecting rod body 1, the holding means 12, that is, the metal 2, is positioned with respect to the connecting rod body 1 in the front-rear direction (P-P direction).

Returning to FIG. 1, 11 is a top plate, and 21 is a drive plate. Further, 12 is the holding means explained in detail in FIG. As explained in FIG. 1, the holding means 12 is composed of a hanging rod main body 31, a pressing member 32, a left-right positioning member 33, and a front-back positioning member 34. 6
1 is a connecting member.

The left-right positioning member 33 has a distal end portion that is
As indicated by the reference numeral 63 in FIG.
It is U-shaped. By holding the large end 3 of the cooking stove main body 1 with this U-shaped portion, the metal 2 is positioned relative to the cooking stove main body 1 in the left-right direction, that is, in the direction of arrow Q-Q. code 5
The part where 1 is closed is the part for positioning the metal 2 in the left and right direction.

As can be seen from FIG. 1, in this embodiment, the holding means 12 is suspended from the drive plate 21 by a piano wire 14 (referred to as a cable in the present invention).
This embodiment is characterized by this point.

Two piano wires 14 are stretched in parallel on the left and right sides of the holding means 12. The lower part of the piano wire 14 is welded to a connecting member 65 fixed to the base 30 of the hanging rod body 31. The upper part of the piano wire 14 is welded to a hanging rod 66 that is attached to the drive plate 21 so as to be able to slide in vertical direction.

The hanging rod 66 is slidable in the vertical direction with respect to the drive plate 21 by the linear motion bearing 52. The linear motion bearing 52 is housed in a bearing housing 67 fixed to the drive plate 21.

A collar 82 is fixed onto the hanging rod 66 by a nut 81, and the hanging rod 66 is suspended from the bearing housing 67 by the collar 82.

FIG. 3 is an enlarged longitudinal sectional view of the portion indicated by arrow Z in FIG. 1.

In FIG. 3, 14 is a piano wire, and 66 is a hanging rod. The suspension rod 66 has a hole 72 extending perpendicular to the axis, the piano wire 14 is inserted into the hole 72, and the piano wire 14 is brazed to the suspension rod 31 at this portion.
What is designated by the reference numeral 73 is solder for brazing.

The operation of this embodiment will be explained.

In this embodiment, the holding means 12 holding the metal 2 is provided with a front-back positioning member 34 and a left-right positioning member 33, and these members are connected to the bolts 4 of the connecting rod body 1, respectively.
and the big end 3. Thereby, the position of the metal 2 in the longitudinal and lateral directions with respect to the connecting rod main body 1 can be accurately determined.

On the other hand, in this embodiment, the holding means 12 holding the metal 2 is suspended by the piano wire 14, and the hanging rod 35 is loosely fitted into the through hole 36. Therefore, the holding means 1 is removed by the distance between the through hole 36 and the hanging rod 35.
2 can move freely forward, backward, left and right.

Therefore, even if there is a misalignment between the metal 2 and the connecting rod main body 1, the longitudinal positioning member 34
When the bolt 4 and the left-right positioning member 33 are aligned with the bolt 4 and the large end 3 of the connecting rod body 1, the position of the metal 2 with respect to the connecting rod body 1 can be accurately determined in both the front, rear, right, and left directions.

Thus, according to this embodiment, the metal 2 can be accurately positioned and assembled to the connecting rod main body 1 in the front, rear, left and right directions.

In FIG. 2, when the air cylinder 15 is driven and the metal 2 is positioned on the connecting rod body 1,
Furthermore, the air cylinder 15 is driven to lower the entire holding means 12. Then, the compression coil spring 6
Since both ends 71 of the metal 2 are pressed by the pressing member 32 via the large end 3
is press-fitted into the

Furthermore, in this embodiment, as shown in FIG.
The piano wire 14 is brazed in the hole 72.
In other words, since the piano wire 14 is not welded to the hanging rod 66 at the portion designated by the reference numeral 73 in FIG. 1, deterioration of the piano wire 14 due to heat during brazing can be prevented. . Incidentally, the portion designated by reference numeral 73 in FIG. 2 is the weakest portion of the piano wire 14, but if brazing is performed at such a portion, the piano wire 14 will become even weaker and its durability will be significantly reduced. The same applies to the brazing between the connecting member 65 and the piano wire 14.

In this embodiment, the piano wire 14 is not directly connected to the drive plate 21, but is connected to the drive plate 21 via a linear motion bearing 52. This is because the entire holding means 12 is lowered in order to press fit the metal 2. This is to prevent the piano wire 14 from buckling and the durability of the piano wire 14 being impaired when the piano wire 14 is bent. That is, as in this embodiment, the piano wire 14 is connected via the linear motion bearing 52.
is connected to the drive plate 52, even if the entire holding means 12 is lowered, the hanging rod 66
This is because the piano wire 14 hardly needs to buckle because it protrudes upward.

In addition, in this embodiment, when the metal 2 is not being assembled to the cooking rod main body 1, the conical part 41 of the hanging rod 35 is placed in the storage part 42 of the top plate 42, as shown in FIG. This is because of the following reasons.

That is, the top plate 11 is not completely fixed to a robot (not shown), but is moved in order to attach the metal 2 to the holding means 12. If the holding means 12 swings back and forth during this movement, it is unfavorable in terms of the durability of the piano wire 14. Therefore, when moving the entire top plate 11 including the holding means 12, it is necessary to fix the holding means 12 to the top plate 11. This is hanging rod 35
This is the reason why the conical part 41 is stored in the storage part 42 of the top plate 42.

Furthermore, as can be seen from FIG. 2, the hanging rod 35 is hollow, and the part marked with 77 is constricted and has a very thin wall.
This is to ensure that if abnormal force is applied to the holding means 12 for some reason, this part will break and other parts will not be damaged.
This is because the hanging rod main body 31 is relatively cheap compared to other parts, although the other parts are made with great precision and are very expensive.

Although a specific embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and includes various embodiments within the scope of the utility model registration claims. For example, in this embodiment, the piano wire 14 is used to hang the holding means 12, but the wire is not limited to the piano wire, and any cable with high flexibility may be used.

[Effect of idea]

According to the present invention, it is possible to accurately position and assemble the second member to the first member in the longitudinal and lateral directions.

[Brief explanation of the drawing]

FIG. 1 is a side view of a floating mechanism of an assembly device according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of a floating mechanism of an assembly device according to an embodiment of the present invention, and FIG. is the arrow Z in Figure 1.
FIG. 4 is a perspective view of the conrod of the engine. 1... Conn rod main body (first member), 2...
Metal (second member), 11...Top plate, 12...
Holding means, 14... Piano wire (cable), 15
. . . Air cylinder (driving means), 21 . 35
...Hanging rod, 36...Through hole, 69...
Compression coil spring.

Claims (1)

[Claims for Utility Model Registration] A floating mechanism used in an assembly device for assembling a second member from above to a first member disposed below, the floating mechanism comprising: a top plate whose position is fixed relative to the first member; holding means for holding the second member and assembling the second member to the first member;
a drive plate to which the holding means is attached and which is displaceable with respect to the flat plate; and a drive plate which is attached to the top plate and which displaces the drive plate with respect to the top plate; and a driving means for moving the rod toward the member, the holding means comprising a hanging rod body, a pressing member fixed to the hanging rod body, and a pressing member attached to the hanging rod body. the second member against the first member by holding the second member and abutting the first member;
a left-right positioning member for positioning the member in the left-right direction; and a left-right positioning member that is attached to the hanging rod main body and that moves the second member forward and backward relative to the first member by coming into contact with the first member. The suspension rod body is composed of a front-rear positioning member for positioning the rod, and the suspension rod body includes a suspension rod extending upward, and a suspension rod located below the suspension rod and integrally fixed to the suspension rod. the suspension rod is loosely fitted into a through hole formed in the drive plate, and a compression coil spring is disposed between the drive plate and the base; A floating mechanism for an assembly device, wherein the base portion and the drive plate are connected by a cable, and the entire holding means is suspended from the drive plate by the cable.