JPS5931722B2 - Non-contact rotary sequencer - Google Patents

Description

[Detailed description of the invention] The present invention relates to a contactless rotary sequencer.

Conventionally, this type of rotary sequencer combines a mechanically rotating disk and a limit switch that fits into a recess formed around the disk, and adjusts the amount of rotation according to the rotation of the disk. A so-called rotary cam switch that detects this as a digital signal has been developed.

However, these rotary cam switches are mainly configured to generate digital signals according to a predetermined angular position using a mechanical method, so the structure is complicated and it is difficult to generate a signal according to a predetermined angle. In some cases, it is difficult to extract signals with high precision. The present invention was proposed to improve the above-mentioned drawbacks, and has the following features: easier to handle, easier to change angle settings, and easier to expand setting locations compared to conventional products. This is the purpose. The present invention makes it possible to keep the contacts in the on state and conversely to keep them in the off state from any point to any point within the rotation angle of 0 to 3600 of the machine shaft, and it is possible to keep the contacts in the on state and conversely in the off state. It attempts to provide a contact rotary sequencer.

Next, embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows the on and off states of the contacts.
2>θ1. Also, when the angles θ3 to θ4 are in the off state, θ4>θ3. Turning the switch on and off is either the above-mentioned A or 口. Fig. 2 shows a block diagram of the present invention. 1. is a rotation angle detector which generates a digital absolute value signal when the rotating body rotates by a certain angle; An absolute encoder is used as the rotation angle detector.

Therefore, the number of angle divisions can be arbitrarily selected, and the number of steps per revolution is, for example, 100 steps,
You are free to take 360 steps or 1000 steps. Reference numerals 2 and 3 are rotation angle setters, respectively. 2 outputs a signal B at the position where the ON state is set, and 3 outputs the signal 5C at the position where the OFF state is set at the set value. The rotation angle detector 1 , rotation angle setters 2 and 3 each output a signal in binary coded decimal code.

4 is a comparator, and the output signal from the rotation angle detector 1 is input to the comparator via a buffer amplifier 5 as an A signal.

The output signals from the rotation angle setters 2 and 3 are applied to a comparator 4 as signals B2 and C', respectively. In the comparator, the input signals A, B', and C' are compared, and A
It outputs as four types of signals: ≧B', A<C', B>C5, and B<C'. Reference numeral 6 denotes a logic circuit which can obtain an output according to the following equation by four input signals input to the window comparator logic circuit.

The output of this logic circuit 6 is an encoded state of either A or A in FIG. The output from the logic circuit 6 is then applied to the non-contact relay 8 via the buffer amplifier 7. In addition, in FIG. 2, the rotation angle setting devices 22, 32...2n
, 3n correspond to 2 and 3 above, and the same applies to the comparators 42...41 and the logic circuits 62...6n. The same applies to buffer amplifiers 72...7n1 and non-contact relays 82...8n. FIG. 3 shows a specific circuit of the present invention.

In the figure, A, B, and C indicate input terminals for the A signal, B signal, and C signal, respectively.

Reference numeral 5 indicates a buffer amplifier, and the portions surrounded by one-dot chain lines indicate the comparator A1 logic circuit 6, respectively.

As described above, in the present invention, the output A of the rotation angle detector and the outputs B and C of the two rotation angle setters are connected to each other via a comparator so that A≧B, A<C, B>C, B<C The configuration is such that the output of D is obtained by using these outputs as input, and this turns the non-contact relay on and off.
b) Since an absolute encoder is used as the rotation angle detector, the rotation angle has absolute value memorability (
(b) The configuration is simple, as it is only necessary to connect an absolute encoder to the rotating shaft. (c) Setting values can be changed even while the machine is operating, which is not only easy but also quick. (d) The setting device can be installed in any location, and the number of settings can be increased freely. (e) Since the electronic circuit is made of gate logic circuits, there are few unstable elements. , and has excellent noise resistance.

Any absolute encoder currently available on the market as an angle detector can be used.

Although a digital switch is used as the rotation angle setting device, a thumb switch or a set switch may also be used. The present invention can be used for automatic sequence control in industrial machinery, and can also be used in places where sequence timing is frequently changed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram, FIG. 2 shows an embodiment of the present invention, and FIG. 3 shows a specific circuit. 1... Rotation angle detector, 2, 3... Rotation angle setter, 4... Comparator, 5, 7...
...Buffer amplifier, 6...Logic circuit, 8.
...Non-contact relay.

Claims (1)

[Claims] 1 The absolute value output A of the rotation angle detector, the output B of the rotation angle setter that specifies the ON position, and the output C of the rotation angle setter that specifies the OFF state are added, so that A≧B, A<C, B >C, B
<A comparator that gives an output of
(B<C)}+{((A≧B)+(A<C))×(B>
C) A non-contact rotary sequencer comprising a logic circuit to which the output of } is given, and a relay activated by the output of the logic circuit.