Boots – shoes – and leggings
Patent
1994-08-23
1996-01-09
Ruggiero, Joseph
Boots, shoes, and leggings
364141, 34082579, G05B 1918
Patent
active
054834600
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a numerically controlled machine tool for machining a workpiece according to a command entered from a keyboard or the like, and more specifically, to a numerically controlled machine tool provided with a machine control console including a keyboard, changeover switches and the like.
2. Description of the Related Art
Recently, a keyboard and switches such as changeover switches and the like on a machine control console provided for a numerically controlled machine tool give a feeling of operation by emitting an LED (light emitting diode) when they are pressed. The light emitting diode is particularly useful when a switch difficult to give a feeling of operation such as a flat key switch is pressed.
In general, an on/off state of switches on a machine control console is determined by means of a matrix. The determination of the on/off state is carried out in such a manner that the switches are caused to correspond to the points of intersections on the matrix and a common signal is supplied to each common line. Conventionally, a numerical control apparatus includes driving circuits for supplying a signal to each of the switches on the machine control console and receiving circuits for receiving signals from the machine control console.
Nevertheless, a problem arises in that when the number of signal lines increases between the machine control console and the numerical control apparatus, a noise such as an impulse or the like is liable to be mixed to the signal lines particularly in a factory where the numerical control apparatus is installed and faulty operation of a machine tool is caused by it. Further, another problem arises in that since as many driving circuits and receiving circuits as the number of signal lines are required, cost increases.
SUMMARY OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide a numerically controlled machine tool by which signal lines between a machine control console and a numerical control unit are reduced to lower a manufacturing cost and to reduce negative affects of noise.
To solve the above problem, according to the present invention, there is provided a numerically controlled machine tool including a numerical control unit and machining a workpiece according to a command input from a keyboard or the like, which comprises switch matrixes having matrix elements disposed thereto in a matrix shape, a first driving circuit for supplying common signals to the common lines of said switch matrixes, a second driving circuit for receiving output signals from data lines of said switch matrixes, and a receiving circuit for receiving input data signals from data lines of said switch matrixes.
The switch matrixes have the matrix elements disposed thereto in a matrix shape. The first driving circuit supplies common signals to the common lines of the switch matrixes.
The second driving circuit receives output data signals from the data lines of the switch matrixes. In the same way, the receiving circuit receives input data signals from the data lines of the switch matrixes.
As described above, since the number of unnecessary common lines can be reduced by the provision of the common wires with the second driving circuit and the receiving circuit, a manufacturing cost can be reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram showing a schematic arrangement of switch matrixes;
FIG. 2 is a schematic view showing a numerically controlled machine tool in its entirety;
FIG. 3 is a block diagram showing an arrangement of a numerical control unit and a keyboard;
FIG. 4 is a diagram showing a specific arrangement of the switch matrix; and
FIG. 5 is a time chart showing a change of respective signals on common lines and data lines.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 2 is a schematic view showing a numerically controlled machine
REFERENCES:
patent: 4168426 (1979-09-01), Furukawa
patent: 4419761 (1983-12-01), Kuze
patent: 4616306 (1986-10-01), Kuzma et al.
Aizawa Yasuharu
Kokura Masuo
Fanuc Ltd.
Ruggiero Joseph
LandOfFree
Numerically controlled machine tool having switch matrices with does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Numerically controlled machine tool having switch matrices with , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Numerically controlled machine tool having switch matrices with will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1307200