JPS5924047B2 - code board - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a code board on which a predetermined code is written,
In particular, it relates to a code board on which the code can be rewritten.

For example, in the assembly process of an automobile factory, when many types of parts are automatically transported to each assembly line in a predetermined order, it is necessary to automatically read the type of each part.

This is done by attaching a code board on which a code corresponding to the type of each IQ part, such as a packet or pallet containing each part, is written, and reading this code board electrically or mechanically. By the way, if the code of one code board is fixed, only one type of part can be associated with one code board, and when handling many types of parts, many codes will be required. A board is required, and if the code board is fixed to a packet or the like, a large number of packets or the like are required. Therefore, handling becomes inconvenient. For this reason, there is a need for a code board that allows the codes on the code board to be rewritten arbitrarily, but conventionally most of the codes are mechanical. There are devices that read codes by pressing down on a metal piece and using a proximity switch to detect the unevenness of the metal piece keyboard.

Code plates with such mechanically movable parts have larger shapes, short lifespans, and low reliability.Furthermore, mechanical operations such as pressing are required when rewriting codes. It is difficult to automate code rewriting. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a code board whose code can be rewritten, is compact, has high reliability, has a long life, and whose code rewriting can be easily automated.

A preferred embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 4.

1 and 2 show elements responsible for one unit of code, FIG. 1 is an explanatory diagram of the configuration, and FIG. 2 is a sectional view.
1 and 2, an element 1 arranged on a code plate has a resonant circuit consisting of a coil 2 and an impedance element such as a capacitor 3. In FIG. A self-holding reed switch 4 is inserted and connected to this resonant circuit. The resonant circuit into which the reed switch 4 is inserted and connected is housed in a case 5, and the case 5 is filled with resin 6. The reed switch 4 opens and closes its contacts depending on the direction of the magnetic pole of an external DC magnetic field, and self-maintains the state after the magnetic field is removed.

The DC magnetic field is provided, for example, by a solenoid electromagnet T with an iron core. When the reed switch 4 is in the closed state, a resonant circuit is formed, and this resonant circuit is detected by the detection coil 9 of the proximity switch 8. That is, the proximity switch 8 generates a detection signal based on the change in the oscillation state of the oscillator due to a change in the impedance of the detection coil 9. An induced current flows through the coil 2 due to the resonance circuit, causing the impedance change in the detection coil 9. Proximity switch works. Therefore, one unit of code can be formed by making the open and closed states of the reed switch 4 correspond to, for example, "01" and "1".
By the way, when using a normal high-frequency oscillation type proximity switch 8, that is, a proximity switch that operates by increasing the conductance of the detection coil 9, the inductance of the coil (coupling coil) 2 of the resonant circuit is set by the L1 capacitor 3.
When the capacitance value of is set to C, it is preferable to set it to v, since the impedance change of the detection coil 9 will be the largest.

Note that f in the above equation is the oscillation frequency of the proximity switch 8. Further, when a resistor is used instead of the capacitor 3 as an impedance element, the resistance value R is preferably selected as R''-2πFL-r.

In this formula, r is the effective resistance value of the coil (coupled coil) 2. FIG. 3 is a perspective view showing an example of the use of the code plate 10, which is formed by arranging a plurality of elements 1 having the above structure.

A code plate 10 on which a plurality of the elements 1 are arranged is attached to the outer wall of the bucket 20. A predetermined code is written on the code plate 10 according to the type of parts to be stored in the bucket 20. For example, in the case of a code plate consisting of four elements, a four-digit binary number such as 60010''''0101'' can be formed by making the opening and closing of the reed switches of the elements correspond to 00''''11. FIG. 4 is a diagram for explaining an example of an automatic rewriting device for writing or rewriting a predetermined code on the code board 10. A plurality of solenoid electromagnets r that apply a DC magnetic field to each reed switch 4 of each element 1 of the code plate 10 are driven by a drive circuit 30. This drive circuit 30 is controlled by an encoder 40. The encoder 40 outputs a predetermined code signal in response to input signals from a plurality of input devices such as push buttons 41, 42, . . . corresponding to the type of part. For example, when using a 4-digit binary number as a code, if the pushbutton 41 corresponding to the nut is pressed, the encoder 40 outputs a code signal "0010", which is transmitted via the drive circuit 30 to a predetermined solenoid electromagnet r. The copy 00107 is written (or rewritten) on the code plate 10 in order to excite the magnetic pole in the direction corresponding to the code.
. As explained above, the code board of the present invention has a plurality of resonant circuits and a self-holding type reed switch inserted and connected to each of these resonant circuits, and these switches are opened by an external magnetic field. Or, since the closed state allows the code to be rewritten without requiring any mechanical moving parts, without contact with the code board, and without power supply, automation of code rewriting can be easily achieved. . Furthermore, since the code plate of the present invention does not require a power source, it can be installed on the side of a moving body that does not have a power source. Note that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various configurations are possible without departing from the gist of the present invention.

[Brief explanation of the drawing]

All the figures show an embodiment of the code plate according to the present invention, and FIGS. 1 and 2 are a configuration explanatory diagram and a sectional view showing one of the elements arranged on the code plate, and FIG. FIG. 4 is a perspective view showing an example of the usage state of the code plate, and is an explanatory diagram for explaining code rewriting. 1... 1 element of code plate, 2... Coil, 3... Capacitor, 4... Self-holding reed switch, 5...・Case, 6...
... Filled resin, 7 ... Solenoid electromagnet, 8
... Proximity switch, 9 ... Detection coil, 10 ... Code plate, 20 ... Bucket, 30 ... Drive circuit, 40.・・・・・・Encoder, 41, 42, ・・・・・・Push button.

Claims (1)

[Claims] 1 It is attached to the moving object and has a plurality of resonant circuits and a self-holding reed switch inserted and connected to each of these resonant circuits, and these switches are opened or closed by an external magnetic field. A code board characterized by: