JPH04160700A - Speed information detector - Google Patents

Abstract

PURPOSE:To reduce the number of cores in a cable, to compact a circuit size and to reduce the number of design/production processes by providing each sensor with plural I/O terminals, providing plural switches between each I/O terminal and its corresponding sensor and deciding which speed sensor outputs a speed signal. CONSTITUTION:Speed signals outputted from respective speed sensors 3a to 3n in accordance with the approach of an object 2 to be measured are supplied to corresponding coding circuits 6a to 6n and then supplied to a traveling controlling controller 5 through the internal switches and I/O terminals of the coding circuits 6a to 6n. In this case, the ON/OFF states of the switches included in respective coding circuits 6a to 6n are respectively changed. Thereby, ID data corresponding to respective speed sensors at the rate of 1 to 1 are supplied to the controller 5 together with the corresponding speed signal at the time of outputting the sped signal, so that which speed sensor outputs the ID data can be decided. Consequently, the number of cores of the cable 7 and the size of an input interface circuit can be reduced and the number of design/production processes can also be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a speed information detection device suitable for use in detecting the speed of an object being transported by a linear motor type transport device or the like.

"Prior Art" An outline of a speed information detection device in a conventional linear motor type conveyance device will be explained with reference to FIG.

In the figure, 1 is the track of the near motor, on which the carrier 2 runs. 3a, 3b,...3n are n speed sensors provided on the track 1, and when the carrier 2 passes a point where each speed sensor is installed, its speed is detected and the detection result is sent as a speed signal. Output as . This speed signal is supplied to the connection box 9, 9°, which is provided one for each of the four speed sensors, and connected to the cables 4, 4.
．． . . . sequentially through the travel control controller 5.
is supplied to

Next, the travel control controller 5 controls each speed sensor 3a.
, 3b, . . . 3n have input terminals (not shown) provided one-to-one. Based on which input terminal the speed signal is supplied to, it is determined which speed sensor 3a, 3b, . . . 3n the speed signal is supplied to, and based on the supplied speed signal. Accordingly, predetermined travel control is performed.

In addition, in FIG. 2, only one carrier 2 is running in the section where the speed sensors 3a to 3n are provided. In addition, if it is necessary to lengthen trajectory 1,
is divided into predetermined sections, and each component shown in FIG. 2 is provided for each section.

In this case, one carrier 2 can be provided in each section.

"Problem to be Solved by the Invention" By the way, in the configuration shown in FIG. 2, each speed sensor 3a
, 3b, . . . 3n are transmitted independently and in parallel to the travel control controller 5. Therefore, as the number of speed sensors increases, the number of cores of the cable 4 increases, and each speed sensor 3a, 3b , 3n to each connection box 9, 9. . . ., and the scale of the input interface circuit (not shown) to be provided in the travel control controller 5 is also large. In addition, speed sensors 3a, 3b,...
Since it is necessary to supply the speed signal output from the drive controller 5 to the corresponding input terminal of the travel control controller 5, each connection box 9, 9 . There is also the problem that the internal connections are different in .

This invention was made in view of the above circumstances,
It is an object of the present invention to provide a speed information detection device that can reduce the number of cable cores and the scale of an input interface circuit, and can extremely reduce the number of design and manufacturing steps.

"Means for Solving the Problems" In order to solve the above problems, the present invention includes a plurality of sensors that detect the speed of an object to be measured when it approaches and outputs the detection result as a speed signal; a coding means having a plurality of input/output terminals and a plurality of switches inserted between the input/output terminals and the corresponding sensors; and a plurality of input terminals; determination means for determining from which speed sensor the speed signal is output based on whether the speed signal is supplied to the terminal, and a corresponding input/output terminal of each of the encoding means and an input of the determination means; It is characterized by being connected to a terminal.

"action" Each sensor outputs a speed signal when the object to be measured approaches.

This speed signal is supplied to a corresponding encoding means, supplied to an input/output terminal via an internal switch, and further supplied to a determining means.

Here, if the on/off state of each switch is set so that the judgment means makes a correct judgment, the corresponding input of the judgment means is transmitted via the input/output terminal corresponding to the switch set to the on state. Since the speed signal is supplied to the terminal, the determining means determines which speed sensor outputs the speed signal.

"Example" An embodiment of the present invention will be described below with reference to FIG.

In the figures, parts corresponding to those in FIG. 2 are designated by the same reference numerals, and their explanations will be omitted.

In the figure, 6a, 6b, . . . 6n are n encoding circuits, and each speed sensor 3a, 3b, . . . 3
It is provided corresponding to n. Then, the encoding circuit 6a
, 6b, ... 6n are cables 7.7.・・・・・・
are sequentially connected in series via . . . and connected to the relay box 10. The relay box 10 and the travel control controller 5 mutually transmit various necessary signals in addition to the speed signal. In addition, Ke-puru 7, 7.・・・・・・
... is a 7-core cable, of which - conductor 79
is the common wire. And each encoding circuit 6a,
6b, . . . 6n, the corresponding conductors of the cable 7.7 connected to both ends thereof are strapped together.

Next, inside the encoding circuit 6a, 81 to 86 are switches, one end of which is connected to the speed sensor 3a, and the other end of which is connected to each conductor of the cable 7.7 except for the common wire 79.
They are connected one to one. Therefore, the speed signal is transmitted via the on-state switch to the cable 7.7. ... is supplied to the corresponding conductor.

That is, the on/off state of each switch 81 to 86 is 2.
If we express the “1” signal and “0” signal of each bit of 5-digit decimal data (hereinafter referred to as identification data), the identification data is added to the speed signal output from the speed sensor 3a. You can see if it will be output.

Incidentally, the encoding circuits 6b, . . . 6n are also configured in the same manner as the encoding circuit 6a.

In the above configuration, each encoding circuit 6a, 6b.

...If the on/off state of the switch provided in 6n is different for each encoding circuit, either speed sensor 3a
, 3b, . It can be determined whether a speed signal is output from the speed sensor. Here, the cable 7. having seven conducting wires as in this embodiment.
7. . . , each encoding circuit 6a, 6b, .
...When assigning different identification data to each 6n, 26-1=63 speed sensors can be connected, except when the value of the identification data is "O", and the speed Compared to the number of sensors, the cable is 7゜7,・
The number of core wires can be made extremely small, and the scale of the input interface circuit to be provided in the travel control controller 5 can be made small. moreover,
Encoding circuits 6a, 6b.

- Since 6n can be uniformly manufactured, it is suitable for mass production, and the number of design/manufacturing steps can be extremely small.

The purpose of the traveling controller 5 is to control the speed of the carrier 2 to a predetermined target speed based on the detected speed signal. Therefore, the same identification data may be attached to sections that are adjacent to each other and have the same target speed.

For example, assume that the target speed of the carrier 2 is selected from a total of three speeds: first speed, second speed, and third speed, and each speed sensor 3a, 3b, 3c, 3d, 3e, . . . 3n If the target speeds at the provided positions are respectively 3rd speed, 2nd speed, 2nd speed, 2nd speed, 1st speed, . . . , 1st speed, then the speed sensor 3 b.

The target speeds at the positions 3c and 3d are both the second speed. Therefore, no matter which one of these three speed sensors outputs a speed signal, the travel control controller 5 operates to minimize the error of the detected speed with respect to the second speed. The same identification data may be attached to the speed signals of these three speed sensors.

In other words, the number of speed sensors provided at the shift points on the track 1 (positions marked with the symbol "mu" in FIG. 1) is determined by the number of speed sensors provided on the cables 7, 7, . Although it is limited by the number of cores, the constant speed point (symbol “△” in Fig. 1)
The number of speed sensors provided at the positions marked with ) can be arbitrarily set within a range that does not cause any practical problems.

"Effects of the Invention" As explained above, according to the speed information detection device of the present invention, by appropriately setting the on/off state of the switch provided in the encoding means, it is possible to detect any speed sensor in the reading means. Since it is possible to determine whether a speed signal has been output from the input interface, the number of cores of the cable and the scale of the input interface circuit can be reduced, and the number of design and manufacturing steps can be extremely reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional speed information detection device. 3a, 3b...Speed sensor (sensor), 5...
...Travel control controller (judgment means), 6a, 6b
... Encoding circuit (encoding means), 81 to 86...
····switch.

Claims (1)

[Scope of Claims] A plurality of sensors that detect the speed of an object to be measured when it approaches and output the detection result as a speed signal, and a plurality of input/output terminals provided on each of the sensors, and a plurality of input/output terminals. a coding means comprising a plurality of switches interposed between the encoder and the corresponding sensor; and a plurality of input terminals, the encoding means comprising a plurality of switches interposed between the encoder and the corresponding sensor; a determining means for determining whether a speed signal has been output from the encoder, and an input/output terminal of each of the encoding means and an input terminal of the determining means are connected to each other.