NL7903835A - Key code copying machine using magnetic elements - uses Hall generators between pairs of transistors forming part of differential amplifiers and LED signal elements - Google Patents

Abstract

The electronic code reading machine esp. for machine tools, is designed for code cards using small magnets, and makes use of the Hall effect. A Hall generator (H1) is mounted between the base terminals of two transistors (T1, T2). These form one stage each of a differential amplifier, with transistors (T3, T4) connected in parallel, each of these latter transistors being in series with a rectifier diode (L1, L2). Two further transistors (T5, T6) are each connected in parallel with the differential amplifiers, and have a light emitting diode (L3, L4) in series, one with each, one diode being red for a north pole and green for a south pole. A similar circuit arrangement with a second Hall generator (H2) is connected in parallel.

Description

Vergonet in Leeuwarden.

Key copier for keys with magnets.

The invention relates to a key copying machine with which keys with magnets can be read.

The US patent publications already disclose the reading of card keys USA 3,896,292 ✓ USA 3,944,762 and USA 3 * 763,676. Furthermore, the visualization of agnetic polarity is known from U.S. Pat. No. 3,663,699.

The object of the invention is electronic

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reading the magnet polarities using the hall effect. A number of Hallgen atoms are used as readers.

Electrical construction of the copier.

15 In drawing 1, two differential amplifiers with transistors are tilted. The hall generator is located between the two bases connected 11 and 12.

Behind this are two direct current amplifiers connected 13 and 13 * Ia the output leads are a 2C. switched red or green light-emitting diode. Two other light-emitting diodes are connected in the collector lines of transistor '13 and f4. With the help of the two potentiometer p.m. 1 and p.a. 2, the voltage on both 790 3 8 35 2 * r is set.

bases of Ί3 and Τ4 »The setting is controlled so that the diodes L1 and L2 just glow. The circuit is then set to its most sensitive. In the drawing 1 we see an example circuit in which two hall generators 5 are used. One for the left and one for the right magnets.

The calibration of the machine can be done with a normal magnet with known polarity. Hereafter it is noted on the outside of the copier that e.g. the LED lights up red and the south is green. Both light emitting diodes are designed as two in one.

In drawing two we see the mechanical construction of the key copier. The -je is located under the base plate 1; circuit. Runner 2 is found on this, where at the end three glued-on plates 3 and 3 serve as key holders. In a guide slot 6, the runner finds the necessary guidance where the guide bolts 7 and S hold the runner in place. At the end of the runner 2o is a scale 9 where arrows 10 and 11 indicate the positions of the magnets. On the base plate the two hall generators are glued 12 and 13%

Furthermore, the t * / ee potentiometers 14,16 for lines and 15γ17 for right outwards.

25 The numbers 18 and 19 indicate the position of the two Double light emitting diodes.

7903835

Claims (7)

1. The copier works by magnetic polarity lending characterized in that lending takes place doGr Kail generates. 2. Behind the Hall generator and a circuit that reads out the characteristic that will be established with this reading A'ocrdpcol, Clear pole or no magnet, leak 1. 3.-behind the hall generators a circuit with. the attribute that it reads on. only south pole and drawing 5 4. Behind the hall generators a circuit with the 790 3 8 35 -'V characteristic that it only reads on north poles drawing 3 but then exchanges the basic principles of the generator. b 5. Claims 1 to b and further characterized in that the Hall generators are mounted on plates such as drawing 5 pj whereby the position of the hall generator can be changed by unscrewing the screw 33 and the hall can be shown on the plate 32. shifted. In order to set up the machine for other types of keys, Another possibility to realize the key reading is another gas seal to be applied in Figure 3. Here the entire polarity of the key is not read, but it is only read out on north poles. After this, the other positions in the key where there are no suid poles or no magnets in the lock are filled with south poles. Finally, Figure 4 still shows the possibility of manufacturing a clamping machine without mechanical 1 :. movable parts in which the owing is effected by 14 hall generators and behind which each generator a circuit of choice token 1 or drawing 5. g 30 is the base plate or the case in which the circuit and 51 is the keyhole. * 2ek 5 32 and 35 Kali confirmation-conclusions. 6. Claims 1 to 5, characterized in that the output of each hall generator is associated with a memory in which the output of the differential amplifier can be stored, with the option of resetting this memory later. -you The preceding claims 1 to 6, further characterized in that the polarity indication is indicated by a number of LEDs or lamps at the outputs of the readout circuit, wherein, depending on the calibration of the copier, the letter N is indicated of 20 'north pole and the designation 5 is given for the south pole, - pFVergonet 10 May 1979 * 7903835