JP2901084B2 - Dog grid spacing adjustment method and dog - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention is provided with a rotary encoder and detects a point to be detected of a dog set at an origin position at the time of origin return, and then detects a next Z-phase signal. The present invention relates to a dog-grid interval adjusting method and a dog that can easily perform a dog-grid interval adjusting operation in a positioning device that defines an origin position by the appearance of a dog.

(Prior Art) In a positioning device provided with a rotary encoder and which determines the home position by the appearance of the next Z-phase signal following detection of a detected point of the dog set at the home position upon home return,
To ensure the detection of the Z-phase signal, the dog-grid interval, that is, the interval between the detected point of the dog and the appearance of the Z-phase signal, is set to one of the Z-phase signal interval (usually a distance corresponding to one rotation of the rotary encoder). Set near / 2. If this interval is too short, the Z-phase detection may fail due to an error in the software processing time, and the origin may be set based on the next Z-phase signal, resulting in an error for one rotation of the encoder.

For this reason, conventionally, the dog is made position adjustable,
Dog grid spacing was adjusted at the time of shipment. This adjustment is performed, for example, by hitting one end of the dog with the fixing screw loosened, shifting the dog by an appropriate amount, and then tightening the fixing screw again.

(Problems to be Solved by the Invention) However, since the conventional dog-grid interval adjustment method as described above adjusts the dog position back and forth, the dog-grid interval is 1 / the Z-phase signal interval. You have to check the adjustment amount and move the dog so that it becomes 2.
There has been a problem that the adjustment requires a lot of trouble and can be adjusted only by a skilled person.

Therefore, the present invention provides a positioning device that includes a rotary encoder and determines the origin position by the appearance of the next Z-phase signal subsequent to the detection of a detected point of the dog set at the origin position when returning to the origin. It is an object of the present invention to provide a dog-grid interval adjustment method and a dog that can easily, quickly, and surely perform the adjustment without necessarily being an expert.

[Means for Solving the Problems] The present invention for solving the above problems is provided with a rotary encoder, and after the detection of a detected point of the dog set at the origin position at the time of the origin return, a next Z-phase signal is outputted. In the method for adjusting the dog-grid interval of the positioning device that defines the origin position by the appearance of the dog, the dog that can shift the detected point by about 1/2 of the interval at which the Z-phase signal appears by inverting the position is provided. It is characterized in that the dog is reversed in advance when the dog-grid interval is inappropriate, and the dog-grid interval is optimized.

In addition, a rotary encoder is provided, and after the detection of the detected point of the dog set at the home position upon home return, the next Z
In a dog used in a positioning device that defines the origin position by the appearance of a phase signal, the two detected points are defined as the difference between the different distances before and after the mounting center position and half the distance between the appearances of the Z phase signal. It is characterized by having.

(Operation) In the dog grid interval adjusting method and the dog of the present invention,
By inverting the dog, the dog grid spacing can be changed to Z
Since it can be shifted by about 1/2 of the layer signal interval, the adjustment can be performed only by inversion of the dog.

(Embodiment) FIG. 1 is a sectional view showing a dog structure according to an embodiment of the present invention.

The dog 1 of this example has three tapping holes 2, 3, and 4 for mounting at equal intervals, and the both end positions are manufactured so as to have dimensions of m and n with respect to the center mounting hole 3, respectively. Have been.
Detected points P ₁ , P _{2 at} which a certain distance from both ends to the inside is detected by a limit switch described later
Are formed on the front and rear side wall tapered surfaces. In the dimensions m and n, mn is set to 1/2 of the signal interval of the Z layer of the rotary encoder. Specifically, for example, the Z-layer signal interval is set to 6 mm.
Then, mn = 3 mm.

As shown in FIG. 2 (a), the dog 1 is in a state where the surface opposite to the detection points P ₁ and P ₂ is brought into contact with the base 5,
The detected point P ₁ or P ₂ is located so that the limit switch 6 arriving from one direction of the base 5 is detected in the direction in which the limit switch 6 comes, and is fixed by three screws 7, 8, 9. Things. Incidentally, when the limit switch 6 is depressed dog 1, enters the inner region of the detection point P ₁ or P ₂ LE
D10 lights up.

As shown in FIG. 2 (a), the dog 1 has a central screw 8
Fixing by inverting, the detected points from P ₁ to P ₂ to,
Or it can be changed from P ₂ to P _1. The displacement of the detected position due to the reversal is 3 mm because mn = 3 mm.

With the dog 1 having the above-described configuration, for example, when the origin is returned in the fixed state shown in FIG. 2A, the operation chart of FIG. 3 is accompanied by the axis operation shown in FIG. Alternatively, the signal of the limit switch 6 changes from the off state to the on state at the timing shown in (d), and then the axis operation is stopped by the appearance of the Z-phase signal shown in (b), and the stop position becomes the origin position. Is set. In the figure, the horizontal axis represents distance.

At this time, as also shown in the conventional example, short or as distance shown in (C) Fig between the position Xz the detected position of the detection point P ₁ (X ₁ or X ₂₎ appearing the Z-phase signal If too long,
A detection error may occur due to an error in the software processing time or the like, and the next Z-phase signal may be detected. That is,
(C) The state shown in the figure is defective (indicated by X),
(D) The state shown in the figure is good (indicated by a circle).

 FIG. 4 shows a method of determining whether adjustment is necessary.

As shown in the figure, when the Z-phase signal interval is 6 mm, the interval is divided into four equal parts, and adjustment is necessary when the detection point of the detected position P ₁ (P ₂ ) enters the region 11 on both sides. can do. Also, when in the inner region 12, no adjustment may be required.

Therefore, in this example, in the relationship shown in FIG.
According to the procedure shown in the figure, the necessity of adjustment is determined, and if adjustment is necessary, the dog 1 is inverted.

FIG. 5 is a flowchart showing a procedure for determining whether or not adjustment is necessary when the positioning device is a back gauge device of a bending machine.

First, when a manual operation key for origin return is pressed in step 501 and a start key for automatic origin return is pressed in step 502, the origin return operation is started and fixed to a moving body (stopper) of the back gauge device. The limit switch 6 shown in FIG. 2 detects the point (P ₁ ) to be detected of the dog 1 and stops upon detection of the next Z-phase signal according to the procedure shown in FIG.

Therefore, in step 503, the current value A (for example, 121.3 mn) displayed on the back gauge current value display is noted. In step 504, the lighting of the LED 10 is confirmed.

Next, press the memory key at step 505 to store the origin, then press the single-acting mode key at step 506, set 1.4mm with the “numerical value input” key at step 507, and operate the input key to set the back gauge. Origin A noted in the value
When a value A + 1.4 mm obtained by adding 1.4 mm to A is input, and an automatic mode is designated and a start command is issued in step 508, the back gauge device is moved to the position of A + 1.4 mm.

The 1.4 mm input here is the distance unit 1.5 shown in FIG.
It is rarely smaller than mm.

Therefore, if the LED 10 is turned off with this movement, it is determined that adjustment is necessary in the relationship shown in FIG.

Therefore, if it is confirmed that the LED 10 is turned off in step 509, the dog 1 is inverted in step 510, and the adjustment operation is completed.

On the other hand, if the lighting of the LED is confirmed in step 509, the process proceeds to step 511, and the back gauge device is operated with the coordinate value set to A + 4.6 mm as in steps 505 to 508.

The input 4.6 mm is a value which is rarely larger than the value of the triple amount of the interval unit shown in FIG.

Therefore, if the LED 10 is still lit with this movement, it is determined that adjustment is necessary in the relationship of FIG. 4, and in this case, the process proceeds to step 510 and the dog 1 is inverted. Then, the adjustment work is completed.

If it is confirmed in step 512 that the LED 10 is turned off, the fourth
In the relationship shown in the figure, it can be determined that the detection of the detected point (P ₁ ) is within the poorly adjusted region.

As described above, in this example, the necessity of the adjustment of the dog 1 can be determined based on the input operation of the numerical values 1.6 mm and 4.6 mm after the return to the home position by turning on and off the LED 10. Since it is only necessary to reverse, the discrimination process is easy and the adjustment is easy. Also, since it can be objectively determined and adjusted,
The adjustment work can be performed easily and quickly even by an inexperienced person. In addition, there is an advantage that the user can arbitrarily adjust by referring to the instruction manual as needed.

In the above embodiment, the necessity of the adjustment is determined by turning on and off the LED 10 according to the procedure shown in FIG.
By displaying the distance from detection of P ₁ and P ₂ to detection of the Z-phase signal, it is automatically determined whether or not this distance is within 1/4 to 3/4 of the Z-phase signal interval. In such a case, the adjustment command may be output when not in this section.

[Effects of the Invention] In summary, the present invention is a dog-grid interval adjusting method and a dog as described in the claims.
Adjustment can be performed easily, quickly and reliably only by reversing the dog.

[Brief description of the drawings]

FIG. 1 is a sectional view of a dog according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a mounting method thereof, FIG. 3 is a chart showing an operation method of a shaft, and FIG. FIG. 5 is a flowchart showing a procedure for determining whether or not adjustment is necessary. 1… dog 6 …… limit switch P ₁ , P ₂ … point to be detected

Claims (2)

(57) [Claims] A method of adjusting a dog-grid interval of a positioning device having a rotary encoder and defining a home position with the appearance of a next Z-phase signal following detection of a detected point of the dog set at the home position upon home return. In the above, a dog capable of shifting the detected point by about 1/2 of the interval at which the Z-phase signal appears by inverting installation is prepared in advance, and when the dog-grid interval is inappropriate, the dog is replaced. A method for adjusting a dog grid interval, comprising inverting a dog grid interval. 2. A dog used in a positioning device having a rotary encoder, which determines a home position after the detection of a detected point of the dog set at the home position upon home return, and which determines the home position by the appearance of the next Z-phase signal. A dog comprising two detected points at different distances before and after a position, wherein a difference between the different distances is a distance which is about half of an interval in which the Z-phase signal appears.