Tool change system for a machine

Description

FIELD OF THE INVENTION

The invention concerns a tool change system for a machine with an automatically (multiaxis) moveable tool according to the preamble of the independent claim. In particular, a robot can be involved and its tool can be an atomizer for series coating of workpieces, like vehicle bodies.

BACKGROUND OF THE INVENTION

Tool change systems for painting robots, whose atomizer is fastened to a flange that forms the releaseable part, which is secured by pneumatic forces on a machine flange forming the fixed part, are state of the art. To release the atomizer, an air connection is operated by the robot itself for opening of a closure cylinder of the atomizer change device of the robot. This air supply by the robot itself can lead to unintentional release of the atomizer possibly during the coating operation during improper control, which not only results in mechanical damage and failure of the coating unit, but also results in an inadmissible hazard of explosion by separation of the electrical connections of the electrostatic atomizer.

SUMMARY OF THE INVENTION

The task of the invention is a tool change system in which the hazard of unintentional opening of the tool change device of the machine is reliably prevented.

This task is achieved by the features of the claims.

In the system described here, the tool change device contained in the machine can only be opened when the tool is reliably fixed in the external change station and coupled to the connections there. The tool in coating installations, in addition to an atomizer, can also be other tools, like hood openers, measurement devices, etc. It is also important in electrostatic painting robots or other coating machines that the atomizer be additionally grounded during loosening of its mouth by opening of the change device.

Control of the air connection expediently accessible on the outside of the robot or other machine can occur automatically in the change station, for example, with a compressed air signal or possibly by opening of the closure. The outer lying air connection has the additional advantage that, if necessary, rapid manual separation of the tool from the machine is also possible by means of a device similar to a manual air pump.

As an embodiment of the invention, the carousel-like change station for atomizers and other tools of a coating installation for series coating of vehicle bodies described in DE 101 15 470 is considered.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows the mounting plate of the change station; and

FIG. 2 shows the flange part of an atomizer insertable into the mounting plate.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1, a mounting plate 10 defines a periphery and has six storage places 12 for the changeable (not shown) atomizer and/or other tools, like hood openers, measurement devices, and the like (not shown). Each atomizer and/or tool includes a flange part 11 releasable from a fixed part of a machine, for example, a painting robot, shown schematically in FIG. 1, that is secured during operation to the fixed part of the robot by a pneumatic cylinder closure. The mounting plate 10 is a carousel-like station rotatable relative to the painting robot. Alternatively, the mounting plate 10 is linearly movable (not shown) relative the painting robot.

The storage places 12 are formed by fork-like recesses into which the flange part 11 of the tools separable by the robot can be introduced in the direction of arrow 12′. A tool holder 19 mounted to float in all three spatial axes preferably has media connections defined by at least two connections 13 for air, rinsing agents and other operating media, identification devices 15 and an adjustable spring-loaded bolt 18. During insertion of the flange parts 11 into the storage places 12, air connections 14 arranged on the flange parts 11 (FIG. 2) and releaseably connected to the connections 13 between the uncoupled state and the coupled state. The connections 13 can also serve for grounding of the atomizer. The identification devices 15 of the storage places are connected during insertion of the atomizer to inserts 16 replaceably arranged in the flange part 11 for type recognition. The flange part 11 also has a centering 17 that engages in an adjustable spring-loaded bolt 18 during insertion of the flange part 11 into the storage place 12. Interaction of the bolt 18 with the centering device 17 serves for position fixation of the flange part 11 in the normal direction of the mounting plate 10. The elements apparent at 20 are a device formed, for example, by ball-check elements for centering of the storage fork in a prescribed position in a prism insert.

The invention has been described in an illustrative manner, and it is to be understood that the terminology which has been used is intended to be in the nature of words of description rather than of limitation.

Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims, wherein reference numerals are merely for convenience and are not to be in any way limiting, the invention may be practiced otherwise than as specifically described.