Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
Patent
1992-02-14
1994-05-24
Pellinen, A. D.
Electricity: conductors and insulators
Conduits, cables or conductors
Preformed panel circuit arrangement
361785, H01R 2368
Patent
active
053150716
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a line branching printed circuit board for a computer numerical controller, and more particularly, to a line branching printed circuit board for a computer numerical controller which permits an easy change of the branching of input/output signal lines between a computer numerical controller and a numerically controlled machine tool.
2. Description of the Related Art
The input/output signal lines between a computer numerical controller and a numerically controlled machine tool are branched on the way from an input/output circuit of the computer numerical controller to the individual control circuits of the numerically controlled machine tool.
Conventionally, such a line branching is made on a line branching panel, and the terminals of the line branching panel are wire-wrapped for connection, but currently, line branching printed circuit boards are used to branch signal lines. The use of a line branching circuit board eliminates erroneous connections and permits an easy line branching, and therefore, line branching printed circuit boards are extremely advantageous particularly when producing standardized products or for mass production.
As mentioned above, when an input/output signal line between a computer numerical controller and a numerically controlled machine tool was branched using a conventional line branching panel, the terminals of the line branching panel were wire-wrapped for connection. This required skill and time, and further, were liable to result in an erroneous connection.
Also, in the conventional line branching printed circuit board for a computer numerical controller, the pins of a particular connector of the input/output signal line of the computer numerical controller are keyed to and connected to the pins of a particular connector of the input/output signal line of the numerically controlled machine tool, because of a pattern-based connection, and accordingly, the input/output signal lines between the computer numerical controller and the numerically controlled machine tool are fixed. Therefore, if it becomes necessary to increase the number of the input/output signals between the computer numerical controller and the numerically controlled machine tool, or to change the signal route, then the pattern on the line branching printed circuit board must be cut and a plating wire must be soldered to the pattern by hand, and thus any change in the branching of an input/output signal line takes much time.
SUMMARY OF THE INVENTION
The present invention is intended to solve the above-mentioned problem, and the object of the present invention is to provide a line branching printed circuit board for a computer numerical controller which permits an easy change of a line branching.
To fulfill the aforementioned object, a line branching printed circuit board for a computer numerical controller, which is designed to branch an input/output signal line between a computer numerical controller and a numerically controlled machine tool, is provided. The line branching printed circuit board comprises a first circuit board connector connected to a junction connector to which an input/output signal line from the computer numerical controller is connected, a plurality of second circuit board connectors individually connected to the junction connectors to which the input/output signal lines to the numerically controlled machine tool are connected, the pins thereof being pattern-connected to the pins of the first circuit board connector, a third circuit board connector having pins pattern-connected to spare pins of the first circuit board connector and spare pins of the plurality of the second circuit board connectors, and a connection changing connector attached to the third circuit board connector for selecting the pins of the third circuit board connector which are to be connected.
Regular input/output signals between a computer numerical controller and a numerically controlled machine tool are transferred through the
REFERENCES:
patent: 4963824 (1990-09-01), Hsieh et al.
Fanuc Ltd.
Krishnan Aditya
Pellinen A. D.
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