JPH0135758B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positioning method for returning a head to a desired origin among a plurality of origins in a head numerical control machine that moves the head in a predetermined direction along an XY coordinate plane on a table surface. .

Conventionally, multiple limit switches are placed on the movement line of the X cursor along the X rail, and multiple limit switches are placed on the movement line of the Y cursor along the Y rail, and the Place multiple limit switches on the line,
Each limit switch corresponds to a predetermined origin. In such a method, if you want to set the head from any position to a certain origin,
First, compare the coordinate values between the current position of the head and the desired origin position, determine the return direction of the head based on this, and then drive the head in the direction of the desired origin so that the X cursor and Y cursor move as desired. When the limit switch corresponding to the home position is turned on, a stop command is issued to the head. According to this method, it is first necessary to store the positions of all origins in a computer, then compare the current position of the head with the desired origin position, and perform arithmetic processing to determine the double return direction of the head. There was a flaw in which the amount of input information to the computer increased. In addition, since multiple limit switches are placed on the movement line of the XY cursor in correspondence with multiple origins, the contacts of the limit switch operate each time the XY cursor moves, causing the limit switch to become fatigued in a short period of time. There was a defect that its lifespan was shortened.

An object of the present invention is to provide a multiple origin positioning method that eliminates the above-mentioned defects.

The configuration of the present invention will be explained below based on the attached explanatory drawings.

2 is the table of the head numerically controlled automatic drafting machine, and the X rails 4 and 6 are fixedly installed on both sides of this table.
X cursors 8 and 10 are movably attached to the X rails 4 and 6. The X cursor 8.
10 are equipped with X pulse motors 12 and 14, respectively, and when pulses are supplied to the X pulse motors 12 and 14, the X cursors 8 and 10 move to the X rails 4 and 10, respectively.
6. 16
is a Y rail installed over the X cursors 8 and 10, and a Y cursor 18 is movably attached to this. When a pulse is supplied to the Y pulse motor 20 mounted on the Y cursor 18,
The Y cursor 18 is configured to move along the Y rail 16. Reference numeral 22 denotes a drawing head, on which a pen 24 is supported so as to be movable up and down, and the holder of the pen 24 is connected to an up/down drive mechanism. The XY pulse motors 12, 14, 20 and the elevating drive mechanism are controlled by instructions from a computer, and the drawing head 22 is sent in a predetermined direction along the table 2, and the tip of the pen 24 is moved to the paper on the table 2. A predetermined pattern is automatically drawn on the paper by moving the paper toward and away from the image. Reference numeral 26 denotes a position detector for a fixed origin (for the No. 1 origin) consisting of a limit switch, and is arranged on the X rail 4 so that the X cursor 8 comes into contact with the movable switch piece. 28 is the above No. 1
It is a position detector for the origin, and the Y rail 16 is moved so that the Y cursor 18 comes into contact with the movable switch piece.
It is located in Move the X cursor 8 along the X rail 4 in the left direction (-x axis direction) in FIG. 1 until the position detector 26 is inserted, and
Move the cursor 18 along the Y rail 16 to the top of FIG.
Position detector 28 is turned on in the downward direction (-y axis direction)
The position of the pen 24 when it is moved until becomes becomes the fixed origin (No. 1 origin) set on the table 2. 30 is a group of home return switches provided on the operation panel 32, No. 1, No. 2, No. 3, No. 4, No.
5. ... Consists of No.Pn switches, which are set on table 2 respectively, such as No. 1 origin, No. 2 origin, No. 3 origin, No. 4 origin, No. 5 origin,
...corresponds to No.Pn origin.

Each origin after the No. 2 origin can be arbitrarily set by inputting coordinate data values based on the No. 1 origin into the calculator 34 using an input device.

The home return switch group 30 is connected to a computer 34.
It has a function of inputting a return-to-origin signal and reading the return-to-origin coordinate data value corresponding to the selected origin from the storage device of the computer.

In the above configuration, in order to return the pen 24 to the origin from an arbitrary pen position A, first, the origin to which the pen is to be returned is selected. Here, the case where No. 2 origin is selected will be explained.

When the No. 2 origin switch is turned on, the computer supplies △-X and △-Y pulses to the XY pulse motors 12, 14, and 20, respectively, by the ON output signal of the switch, and the X cursors 8, 10 teeth,
The Y cursor 18 moves along the X rails 4 and 6 in the Δ-X direction, that is, in the left direction in the drawing, and the Y cursor 18 moves in the Δ-Y direction, that is, in the downward direction in the drawing, along the Y rail 16.
Next, the computer checks whether position detectors 26 and 28 are ON or OFF.
If only the position detector 28 is ON,
Pulses in the Δ-X direction are supplied to the pulse motors 12 and 14, and when only the position detector 26 is ON, pulses in the Δ-Y direction are further supplied to the pulse motor 20. Next, when the computer determines that both position detectors 26 and 28 are turned on, if the return switch is No. 1, the return operation of the head 22 is completed. Currently, the No. 2 return switch is selected, so next, check the switch number and select the No. 2 return switch.
The coordinate values of the second origin are read from the storage device of the computer 34, coordinate data pulses of Δ×1 are output to the X pulse motors 12 and 14, and ΔY1 are output to the Y pulse motor 20, and the pen 24 is positioned at the No. 2 origin. Next, it is checked whether the head 22 has finished moving and the return operation is completed. When the origin of No. 3 and other No. Pn is selected, the pen returns to the origin in the same manner as above.

Although the above example is a case in which the return-to-origin command is issued by manual switch operation, the return-to-origin information may also be input to the input tape for driving the head to the computer. Note that this method can also be applied to a head numerically controlled machine that moves with respect to the table Y rail.

As described above, in the present invention, a fixed origin of the head is set on the table surface by a head position detection device, and any other origin is set with reference to the fixed origin.
Since the setting is performed using XY coordinate data, the head position detecting device is not used for setting any other origin, so there is no problem of failure of the device.

Further, there is an effect that it is possible to prevent the operation of the computer and the input data from becoming complicated and voluminous.

[Brief explanation of drawings]

1 is an explanatory plan view, FIG. 2 is a plan view of the operation panel, FIG. 3 is an explanatory view, and FIG. 4 is a flowchart of the operation sequence. 2...Table, 4,6...X rail, 8,1
0...X cursor, 12, 14...X pulse motor, 16...Y rail, 18...Y cursor, 2
0...Y pulse motor, 22...Drawing head, 2
4... Pen, 26, 28... Position detector, 30...
...Home return switch group, 32...Operation panel, 3
4...Calculator.

Claims (1)

[Claims] 1. In a head numerical controller that automatically controls the position of the head relative to the table using a computer, a head position detection device sets a fixed origin on the table, while inputting a return-to-origin signal to the computer. At the same time, a plurality of origin return switches are provided on the operation panel of the head numerical controller for reading selected origin return coordinate data values based on the fixed origin corresponding to the selected origin from the storage device of the computer, selecting one of the homing switches to turn it on to return the head to the fixed origin, corresponding to the selected homing coordinate data value subsequently called by the selected homing switch; 1. A method for positioning multiple origins, characterized in that a drive signal is applied to a head driving device to return the head to an arbitrary origin.