JPH0790375B2 - Work table for work with protrusions - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a workbench of a work with protrusions, and more particularly, to a technique for moving a work in a horizontal direction to position the work.

[Conventional technology]

Conventionally, as an example of a spot welding device as a technique for moving and positioning a work as described above, for example,
JP 59-157787 Gazette or JP 58-166982
There is one disclosed in Japanese Patent Publication No. JP-A No. 2003-242242, and each of the references is configured to move the work in the XY direction by a driving force in order to position the work with respect to the spot welding device.

[Problems to be Solved by the Invention]

Here, considering the means for moving the work in the XY directions, it is possible to position the work with a relatively small size by directly supporting the work on a movable rail or the like, but the work is a thin plate material. Since it is possible that a large-sized object will be deformed by its own weight, when moving such a work, the work is slid on the table while being placed on the table, or
It is desirable to move with the table to position the work.

However, it is difficult to place the work on the table in a stable posture, such as when a work having a protrusion on the lower surface is attempted to be positioned, a special jig is required according to the shape of the work. Further, in the structure in which the work is moved together with the table, not only the structure for moving the work in all the XY directions is increased in size but also the actuator is increased in capacity.

Further, assuming that the spot welding apparatus is carried out by moving the work in the XY directions, positioning can be improved by automatic control such as teaching playback, but the work efficiency can be increased, but the work can be made up of many parts. In the case of a device configured with, it is effective to artificially move the work and temporarily attach the parts before performing the spot welding apparatus by automatic control in order to improve work efficiency.

An object of the present invention is to firstly configure a workbench of a work with a projection capable of feeding and positioning a large work having a projection in a stable posture in a horizontal direction to a predetermined position, and secondly by a simple operation. The point is to construct a work table for a work piece with a protrusion that can move the work piece by a large amount.

[Means for Solving the Problems]

The first feature of the present invention is to provide a large number of pillar-shaped members having a height larger than the protruding length of the protrusion formed on the lower surface of the work,
The table is provided at a predetermined interval so as to slidably support the work in the horizontal direction, and the table and the column arranged above the table are movable in the first horizontal direction with respect to the gantry. A chucking hand configured to hold a work supported by the column-shaped member is movable with respect to the column so as to feed the work in a second horizontal direction orthogonal to the first horizontal direction. And a first positioning means for determining the position of the chucking hand in the second horizontal direction with respect to the column, and an integrated movement position of the table and the column in the first horizontal direction with respect to the gantry. The second feature of the present invention resides in that each of the second positioning means determines a second positioning means. The second positioning means has a coupling mechanism for coupling the table and the column, and an actuator. In addition, the connecting mechanism is configured to be capable of releasing the connection, and its operation and effect are as follows.

[Work]

According to the first feature described above, since a large number of pillar-shaped members contact the position avoiding the protrusion during work to support the work, the work having the protrusion can be maintained in a stable posture, and the second feature can be obtained. During the movement by the positioning means, the column and the table are moved relative to the gantry without relative movement while the workpiece is held by the chucking hand, so that the column and the workpiece are integrally moved in the first horizontal direction. By moving the chucking hand, the relative position with respect to the pedestal can be determined, and when the first positioning means moves, the chucking hand moves the chucking hand relative to the column while holding the work. The work in a second horizontal direction in a direction orthogonal to the first direction by sliding the work at the upper end of the strut-like member in a state where the work is passed between the strut-like members. By moving becomes capable determines the relative positions of the gantry.

In other words, according to the present invention, the positional relationship between the columnar member and the protrusion on the lower surface of the work is set to allow the movement of the work on a straight line by the first positioning means, and the interval between the pillar-shaped members is set. The movement of the work in the movement direction, the direction orthogonal to this movement direction, and the combined direction thereof is also permitted.

Further, according to the second feature, by releasing the connection of the chucking hand of the second positioning means, the column and the chucking hand can be largely separated from the table. The upper end of the pillar-shaped member is slid while avoiding contact with the work, and the work can be artificially sent in an arbitrary horizontal direction and a synthetic direction thereof to be set at a desired position.

This is used, for example, for work such as temporarily moving the work by artificially moving the work table of the present invention even when the work is configured to include a large number of parts. When changing the chucking position of the chucking hand for a large work, the work can be easily moved artificially.

〔The invention's effect〕

Therefore, a workbench of a work with a protrusion is constructed which can feed a large work having a protrusion on the lower surface to a predetermined position in a horizontal direction in a stable posture and perform positioning (claim 1).
Further, the workbench of the work with a projection is constructed so that the work can be artificially moved to a desired position by a simple operation (claim 2).

In particular, in the present invention, even when the first and second positioning means are simultaneously actuated to move the work in the combined direction at the shortest distance, the protrusion of the work is not brought into contact with the strut-like member. Also in the case of performing control, there is an effect that it is possible to quickly position the work without performing a special calculation process such as obtaining a relative positional relationship between the support member and the protrusion of the work (claim 1). ).

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 5, a base (2) having a pair of upper and lower electrodes (1), (1) for spot welding, and a work (W) with respect to the base (2). A work table having a table (4) on which a large number of pillar-shaped members (3) are erected so as to determine a predetermined position, and a column (5) arranged above the table (4). And a spot welding device is configured.

As shown in FIG. 6, the table (4) is a mount (6).
5 is supported by a mount (6) via a plurality of rails (7) so that it can slide in the Y direction (first horizontal direction) shown in FIG. Each one is connected to one stay (8) at the base end side, and these stays (8) ... Are adjusted so that their positions can be adjusted in the Y direction with respect to the table (4). It is supported by the table (4) via.

As shown in FIG. 6 and FIG. 8, a ball (11) rotatably held by a holder (10) is provided at the upper end of each pillar-shaped member (3).
Is adapted to allow the work (W) placed on the upper ends of the pillar-shaped members (3) to slide by rotation.

As shown in FIG. 2, the columns (5) are arranged in a horizontally long shape along the X direction (second horizontal direction) shown in FIG. 5, and are arranged at two locations in the center and at both ends thereof. Legs (1
2), (12), (13), (13), and the lower end of each leg is provided along the Y direction (first horizontal direction) on the side of the mount (6) (14). The column (5) is configured to be slidable in the Y direction orthogonal to the X direction by being supported by.

As shown in FIGS. 5 and 7, on the side surface of the column (5), there is provided a chucking hand (16) for interlocking and connecting the work (W) by the operation of the cylinder (15), and the chucking hand (16). A pair of rails (18), (18) for guiding the connecting frame (17) of (16) in the X direction and a pair of rails (18) for reciprocating the connecting frame (17) in the X direction. A first positioning means (A) is provided that is screwed with the nut (19) on the side and has a screw shaft (21) that is rotated by the electric motor (20) in the forward and reverse directions. There is.

Of the above-mentioned leg portions, the leg portions (1
3) and (13) have a pin (2
A connecting mechanism (C) for connecting and disconnecting the table (4) by inserting / removing the lock frame (24) in (3) is provided.

As shown in FIG. 4, a nut (25) on the table (4) side is screwed between the mount (6) and the table (4),
In addition, the electric motor (26) provided on the gantry (6) side comprises a screw shaft (27) that can be rotated in the forward and reverse directions, and a mechanism for moving the table (4) in the Y direction is provided. This mechanism and the connecting means (C) are collectively referred to as second positioning means (B).

Then, the second positioning means (B) can integrally move the table (4) and the column (5) when the table (4) and the column (5) are connected by the connecting mechanism (C). Is configured.

Further, the movement of the chucking hand (16) in the first positioning means (A) is detected, and the movement of the table (4) by the second positioning means (B) is detected. A non-contact type stroke sensor (not shown) is provided along the direction, and when performing work with this spot welding apparatus, the work (W) is placed on the column-shaped members (3), ... By connecting the work (W) to the side of the first positioning means (A) by the king hand (16) and setting the connection mechanism (C) in the connected state, the work (W) in the X direction can be moved. The movement is performed by sliding the work (W) at the upper ends of the pillar-shaped members (3) by the operation of the first positioning means (A), and the movement of the work (W) in the Y direction is performed by the second positioning means ( By the operation of B), the work (W) is It is configured to be moved together with the table (4) and the column (5).

The control system is configured so that the signal from the stroke sensor is fed back when performing automatic control such as teaching playback to move the work (W) in the X-Y directions.

The strut-like member (3), even if the work (W) is formed with a protrusion (Wa) as shown in FIG. 8, in a state where the contact with the protrusion (Wa) is avoided. ) Can be stably supported, and the stays (8), respectively, are provided so that the protrusion (Wa) and the strut-like member (3) do not come into contact with each other when the work (W) is moved in the X direction. The position of the table (4) is adjusted to form a space for moving the protrusion (Wa) in the X direction.

Since the stay (8) is positioned, a large number of engaging holes (28) are formed on the table (4) side as shown in FIG.
a) is provided with a plate (28), and a pin (29) manually operated to engage with the engaging hole (28a) is attached to the stay (8) side by a spring (30). It is provided in a biased state.

Incidentally, when temporarily attaching the parts to the work (W), the connection of the connection mechanism (C) is released, and the work (manual work () is performed with the column (5) being separated from the welding point. The position can be adjusted in (W) or by moving the table (4) only in the Y direction.

[Other Embodiments] In addition to the above embodiments, the present invention can be implemented in various ways, for example, by using a hydraulic type or a chain as the drive structure of the first and second positioning means, and sliding of the upper end of the strut-like member. The structure can be variously implemented by providing a resin material having a low friction coefficient on the upper end of the pillar-shaped member.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

Drawing shows an embodiment of a spot welding apparatus according to the present invention,
1 is a plan view of the welding apparatus, FIG. 2 is a front view of the welding apparatus, FIG. 3 is a side view of the welding apparatus, FIG. 4 is a view showing a screw shaft of the second positioning means, and the like. FIG. 6 is a perspective view showing the outline of the structure of the welding apparatus, FIG. 6 is a front view showing a strut-like member, FIG. 7 is a side view showing a chucking hand, a connecting mechanism, etc., and FIG. 8 is a strut-like member. It is a side view of a state where a work is placed. (3) ...... Support member, (4) ...... Table, (5) ...
… Column, (6) …… Stand, (16) …… Chucking hand, (26) …… Actuator, (A) …… First positioning means, (B) …… Second positioning means, (C) ... ... Connection mechanism, (W) ... work, (X) ... second horizontal direction, (Y) ... first horizontal direction.

Claims (2)

[Claims] 1. A large number of column-shaped members (3) having a height larger than the protruding length of a protrusion formed on the lower surface of a work (W).
Are provided on the table (4) at predetermined intervals so as to slidably support the work (W) in the horizontal direction, and the table (4) and a column (arranged above the table (4) ( 5) and 5) are movable in the first horizontal direction (Y) with respect to the pedestal (6), and a chucking hand for holding the work (W) supported by the pillar-shaped members (3). (16) is configured to be movable with respect to the column (5) so as to feed the work (W) in a second horizontal direction (X) orthogonal to the first horizontal direction (Y), and A first positioning means (A) for determining the position of the chucking hand (16) in the second horizontal direction (X) with respect to the column (5), and the first with respect to the pedestal (6).
Of the work with protrusions, each of which is provided with second positioning means (B) for determining the integrally moving position of the table (4) and the column (5) in the horizontal direction (Y). 2. A connecting mechanism (C) for connecting the table (4) and the column (5) by the second positioning means (B),
Actuator (26) and connecting mechanism (C)
The workbench of the work with protrusions according to claim 1, wherein the worktable is configured so that the connection can be released.