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ND COMPUTER SYSTEMS¶
[Photo: ND Card Reader Machine]
ND 400/402 CARD READER, 285 cpm¶
ND 450 CARD READER INTERFACE¶
INTRODUCTION¶
The ND 400/402 Card Readers and the ND 450 Card Reader Interface are low-cost card readers for the ND computer family. Using vacuum pick mechanism, these small, compact Card Readers are designed for operating where cards are especially vulnerable to damage through rough handling or adverse environment.
FEATURES¶
- 285 cards per minute
- 550 card hopper capacity
- Vacuum pick mechanism
- Straight through card track
- Light emitting diode light station
- Phototransistor head station
- Manual or automatic picker shut-down
- Status indicators: READ, PICK, STACK and HOPPER check
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Product Description¶
Card Feeding Mechanism¶
The card feeding mechanism is designed around an air flow system using air pressure to separate the cards and a vacuum to pick the cards. Pressurized air riffles the first half inch of cards in the input hopper such that they stand apart, individually "air cushioned" from the rest of the card deck and each other. This prevents the cards from sticking together in case of static electricity, hole locking, or torn webs and eliminates frictional forces between the cards.
The vacuum picker pulls the bottom card in and holds it against the picker's rubber surface. When a pick command is received, the reader's electronics drives a rotary solenoid coupled to the picker sector causing it to rotate. As the solenoid moves the picker sector, the card is accelerated due to the friction forces caused by the vacuum between the picker’s rubber surface and the card. The picker sector rotates pulling the card toward and into the drive rollers. When the leading edge of the card reaches the drive rollers, the rollers pull the card into the card track. The picker is now returned to its rest position by spring tension. As the card in the track clears the picker's surface, the next card is sucked down ready for the next pick command.
Reader Control¶
A phototransistor sensor array reads standard 12 row, 80 column punched cards in serial, column by column. Reader Control synchronizes the electronic scanning of the card with the mechanical actions of the reader. This provides card picking, card movement through the read station, data flow control and card stacking. Data Detection converts the light/dark conditions of the read station into usable digital signals for Data Storage. Data Storage provides the data synchronization, buffering and retainment required for data transfer from the reader.
Specifications¶
Card Readers: Documation M200¶
| Specification | Details |
|---|---|
| Card rate | 285 cards per minute, standard |
| Card type | 80 column ANSI x 3.11.1969 punched per ANSI X3.21.1967 |
| Hopper/stacker | Approximately 550 cards |
| Light source | Infrared light emitting diodes |
| Read station | Phototransistor, 12 bits parallel |
| Electronics | TTL integrated circuit logic |
| Internal clock | Crystal oscillator |
| Power | 1425 VA starting load for 3 sec. 650 VA running load |
Size¶
| Dimension | Measurement |
|---|---|
| Height | 41.3 cm (16") |
| Width | 58.6 cm (23") |
| Depth | 45.7 cm (18") |
| Weight | 27.2 kg (60 lbs) |
Power¶
| Model | Voltage/Frequency |
|---|---|
| Power (ND 400) | 230 VAC ± 10%, 50 Hz |
| Power (ND 402) | 115 VAC ± 10%, 60 Hz |
Environment¶
| Condition | Range |
|---|---|
| Temperature (operating) | 10 to 38° C |
| Relative Humidity (operating) | 30 to 90% |
[Logo: Norsk Data]
[Logo: ND COMTEC]
NOTE: NORSK DATA reserves the right to change specifications without given notice!