JPS592067B2 - Punch hole reading method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a perforated tape or card reading mechanism that includes:
The present invention relates to a punch-hole reading method in which the conduction state of contacts is checked in advance to avoid erroneous readings.

FIG. 1 is a side view of a main part of a conventional device of this type.

In the figure, reference numeral 1 denotes a perforated tape or card, which is fed by a feeding mechanism (not shown). Reference numeral 2 denotes a lead pin for reading the punch tape or card 1, and is slidably mounted in the pin guide 3.

4 is a pin lever, which is rotatably supported on a support shaft 4a;
The lead pin 2 is fixed to one end 4b, and the other end 4c contacts the movable bar 5 and pushes it to the left.

A fixed spring 6 is installed opposite to the movable spring 5. Contacts 5a and 6a are fixed to these springs 5 and 6, respectively, facing each other. This is a so-called normally open type reading spring which is displaced to the right by the restoring force of the movable spring 5 and closes the contacts 5a and 6a when a hole is detected.

T is a reset lever that is rotatably supported on a support shaft Ta, one end 7b abuts on the pin lever 4, and the other end 7c abuts on a reset cam 8, and the reset cam 8 is rotatably supported on a support shaft Ba. supported.

9 is hung on the reset lever 7 by a lever spring,
A clockwise force is always applied to the reset lever T.

Therefore, the lead pin 2 is displaced up and down depending on whether there is a hole in the punch tape or the card 1, so the pin lever 4
The contacts 5a, 6a are turned on and off via the holder, thereby detecting the presence or absence of a perforation and allowing the perforation tape or card 1 to be read.

Since the conventional device has the above-mentioned configuration, even if the reading contacts 5a and 6a have a contact failure due to adhesion of dust or oil, the reading will continue as is, which may cause erroneous reading. There was a flaw that caused it. In order to eliminate these drawbacks, the present invention uses a so-called normally closed type contact for reading detection, and when the contact is in a normal state, a monitoring pulse is applied in advance to confirm contact continuity, and then reading is performed. The drawings will be described in detail below.

FIGS. 2, 3, and 4 are side views of main parts, circuit configuration block diagrams, and time charts showing one embodiment of the present invention.

The same parts in FIG. 2 as in FIG. 1 are given the same reference numerals. In FIG. 2, reference numeral 11 denotes a movable spring, and a fixed spring 12 is provided opposite to the movable spring 11, and contacts 11a and 12a are fixed to these springs 11 and 12, respectively, facing each other. The movable spring 11 is pushed to the left by the other end 4c of the pin lever 14, and when the lead pin 2 detects a hole in the perforation tape or card 1, it is pushed to the right by the restoring force of the movable spring 11. This is a normally closed type reading spring with a structure in which the contact points 11a and 12a open when the contact point 11a and 12a are displaced. Next, the operation of the present invention will be explained using FIGS. 2, 3, and 4.

Now, in the state shown in FIG. 2, in which the punch tape or card 1 is sent to the reading unit by a feeding mechanism (not shown) and the reading contacts 11a and 12a are closed and energized, a reading start pulse is applied. When A is input, contact monitoring pulse generator 2
A contact monitoring pulse B is generated from 1, and the contact monitoring pulse B is connected to a set cam drive circuit 22 and an AND gate 23.
It becomes the input to. At this time, the read contacts 11a, 12a are in the closed state, and if there is no contact failure, the 0R gate output of the 0R gate 24 from the read contacts 11a, 12a is "O".Therefore, the input to the AND gate 23 Since the contact monitoring pulse B is [1] and the 0R gate output C is "0", the AND gate output D is "O", that is, there is no contact failure, and the reset cam drive circuit 22 operates and the reset cam Drive pulse E causes reset cam 8 to rotate shaft 8.
Rotate around a. When the other end 7c of the reset lever 7 reaches the trough of the set cam 8, one end 7b1 of the reset lever 7 rotates around the shaft 7a due to the tensile force of the lever spring 9, and the other end 7c moves to the trough of the set cam 8. It comes into contact with the valley of. Therefore, depending on whether or not there is a hole in the perforation tape or the card 1, the other end 4c of the pin lever 4 is connected to the movable spring 1.
Pushed to the right by the restoring force of the lead pin 2, the lead pin 2 is displaced in the pin guide 3, and the contacts 11a and 12a are turned on and off, thereby detecting the presence or absence of a perforation, and inserting the perforation table or Card 1 can be read. After reading is completed, the reset cam 8 rotates and the reset lever 7
When the other end 7c comes into contact with the peak of the set cam 8 and returns to the state shown in FIG. The above operation is repeated. Furthermore, during reading, the 0R gate output C of the 0R gate 24 from the reading contacts 11a and 12a becomes [1], but at this time, the contact monitoring pulse B is "o", so the AND gate output D is "0".
” and has no effect on the set cam drive circuit 22. Furthermore, before starting the reading operation in FIG. 2, the reading contact 11a
, 12a, the read contact 11a,
The 0R gate output C of the 0R gate 24 from 12a is [1
”, and when the reading start pulse is input in this state, the contact monitoring pulse B is “1” and the AND gate 23 is opened, and the AND gate output D1, that is, the contact fault signal is output. The excitation of the reset cam drive circuit 22 is stopped and the continuation of the reading operation is stopped. As explained above, according to the present invention, the above-mentioned normally closed contact is used as the reading contact, and a monitoring pulse is applied in advance every time the reading is recycled, and the reading is performed after confirming the continuity of the contact. This has a great effect in preventing misreading.

[Brief explanation of drawings]

FIG. 1 is a side view of the main part of a conventional device, FIG. 2 is a side view of the main part showing an embodiment of the present invention, and FIG. 3 is a block diagram of the circuit configuration of the embodiment shown in FIG. FIG. 4 is a time chart illustrating the operations of FIGS. 2 and 3. 11...Movable spring, 11a, 12a...
・Contact, 12...Fixing spring, 21...
Contact monitoring pulse generator, 22... Reset cam drive circuit, 23... AND gate, 24...
...0R gate, 25...Feed drive circuit.

Claims (1)

[Claims] 1. In a mechanism that reads perforations on a perforated tape or card by the vertical movement of a lead pin, a normally closed contact is used as the reading contact, and the contact is monitored in advance at each reading cycle. Characteristic punch hole reading method.