JPS629959B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stop control device that stops a card conveyance motor in a card reader or the like when a card reaches a specified position.

In recent years, various types of cards with information recorded on them, such as magnetic cards and punch cards, have come to be used for inputting information, and card input devices such as card readers have become widely used in various fields.
It is necessary to accurately stop these cards at a predetermined position before punching, etc., and it is necessary to quickly stop the card transport motor for operating the card transport mechanism depending on the card's predetermined position. It has reached this point.

For example, in magnetic card public telephones, a commercially available magnetic card is used instead of coins, data on the number of calls is recorded in advance, and the card is inserted into the public telephone's card slot. The magnetic card is stored inside the device, the data on the magnetic card is subtracted according to the actual call frequency, and the data on the remaining call frequency is updated and recorded on the magnetic card according to this result, and then discharged. However, at this time, a hole indicating the residual speech power is punched at a predetermined portion of the magnetic card, so it is necessary to accurately stop the magnetic card at a predetermined position corresponding to the residual speech power at the time of punching.

The present invention has the purpose of completely satisfying such requirements, and has the purpose of connecting a card conveying motor with a pulse generator that generates a pulse signal in accordance with the rotation of this motor, and in which the motor is in a braking state. The pulse width of the pulse signal generated by the pulse generator is then monitored,
To provide an extremely effective stop control device for a card conveying motor that can reliably stop a card at a prescribed position by stopping braking output to the motor when the pulse width exceeds a predetermined value. It is something.

Hereinafter, details of the present invention will be explained with reference to figures showing examples.

FIG. 1 is a block diagram showing the configuration. When a start signal ST is given to the motor drive unit MD that drives the card transport motor M, the drive unit MD generates a normal rotation output, so The motor M rotates in the forward direction, and the card CD runs in the forward direction.

When the card CD travels and reaches the detection position, the card CD is detected by the detection element SS such as a light receiving element and the position detection part CS, and the waveforms at each part of FIG. 1 and the rotation speed r of the motor M are shown in FIG. 2. As a result, a detection force a is generated, which is applied to the position selection section PS.

Then, a separate controller controls switches SW ₁ to
Since SWn is selectively turned on depending on the stop position of the card CD, the position selection unit PS consisting of a code conversion circuit, a gate circuit, etc. It is converted into a code indicating the count value and sent to the counter TC.

As the counter TC, for example, a presettable subtraction counter is used, and is preset by a code indicating the count value from the position selection section PS.

On the other hand, a pulse generator PG such as a rotary pulse generator is connected to the motor M, which generates a pulse signal b according to the rotation of the motor M, and generates a waveform shaping unit.
Since it is fed to the clock input of the counter TC via WF, the counter TC
performs subtraction, and if the count value becomes zero, the output c
is generated and applied to the motor drive section MD and pulse width detection section PT.

Then, the motor drive unit MD converts the output d from the forward rotation output F to the reverse rotation output B, and applies this to the motor M as a braking output, so the motor M starts decelerating, and the pulse width of the pulse signal b changes accordingly. t _p expands.

In addition, the pulse width detection section PT, which is composed of a monostable multivibrator and a gate circuit driven by the change point of the pulse signal b, becomes active after the motor drive section MD generates a braking output due to the output c, and the pulse width detection section PT is driven by the change point of the pulse signal b. The pulse width t _p of is monitored, and when the pulse width t p exceeds a predetermined value T, a detected force e is generated, thereby stopping the output d of the motor drive unit MD. Then, due to inertia, it rotates slightly forward and then comes to a complete stop.

Therefore, if the predetermined monitoring value T of the pulse width t _p is determined according to the inertia of the motor M and the transport mechanism, the switches SW ₁ to SWn can be adjusted based on the position where the card CD is detected by the detection element SS. Accurately stops at the specified position determined by the on state.

However, if the forward rotation output F and the reverse rotation output B are alternating current or pulse signals, direct current may be sent as the braking output and electromagnetic braking may be used.
Depending on the conditions, various modifications are possible, such as omitting the counter TC and providing a signal corresponding to the output c from a separate circuit.

As is clear from the above description, according to the present invention, the braking output is stopped depending on the deceleration status of the card conveyance motor, so the card can be accurately stopped at a specified position, and with a simple configuration. By achieving the objective, remarkable effects can be obtained in terms of stop control for card conveying motors for various uses.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a timing chart showing the waveforms of various parts and the rotation speed of the motor in FIG. CD...Card, M...Card transport motor,
MD...Motor drive section, PG...Pulse generation section,
PT...Pulse width detection section.

Claims (1)

[Claims] 1: a motor drive section that drives a card conveyance motor; a pulse generation section that is connected to the motor and generates a pulse signal according to the rotation of the motor; and a pulse generation section that is connected to the motor drive section after the motor drive section generates a braking output. and a pulse width detection section that generates a detection force and stops the output of the motor drive section when the pulse width of a pulse signal generated by the motor exceeds a predetermined value. Device.