Reader for reading magneto-optical characters, with the options of printing them or storing them
First Claim
1. In a magneto-opical character reader for reading characters such as CMC7 characters, the reader comprising a path suitable for receiving and driving a document carrying such characters through predetermined positions, a premagnetization transducer for premagnetizing said characters, a read transducer for reading said characters, and electronic control and processing means connected to said transducers, the improvement wherein said path for receiving the document includes wheels having axes fixed relative to a frame, and said transducers being mounted opposite a respective one of said wheels and being controllably and resiliently urgeable towards said respective wheel.said electronic control and processing means including read means comprising:
- analog amplifier means having an anti-saturation gain characteristic;
first comparator means possessing hysteresis and having a signal input connected to the output of said analog amplifier means, and a reference input receiving a reference voltage close to zero volts, an output, and an output to said reference input to provide said hysteresis;
second, fast-acting comparator means having a signal input connected to the output of said analog amplifier means, a reference input connected to the output from the first comparator via a capacitative circuit including a diode, and an output connected to said input via a diode link; and
logic means for providing a logic signal representative of the characters read on the basis of the output signals from said two comparator means.
2 Assignments
0 Petitions
Accused Products
Abstract
A reader for reading magneto-optical characters, with the options of printing them or storing them.
A track is provided for driving a check from an inlet plate (T1) over various portions of path (T2, T3 and T4). Wheels (G1 and G2) are provided beneath the path, and may be motor driven. Above said wheels there are heads (TM1 and TM2) respectively for premagnetizating and reading CMC7 characters. Each head is mounted on one arm of a corresponding bell crank (L1, L2) which cranks are pivoted to a frame at their corners (L10 and L20). The other arm (L12 and L22) of said bell cranks are resiliently urged by springs (L15 and L25) mounted on an actuator rod (AC) which is itself driven by an electromagnet (EM2). It has turned out that such an assembly ensures effective transducer operation of the heads (TM1 and TM2) for reading CMC7 characters.
38 Citations
9 Claims
-
1. In a magneto-opical character reader for reading characters such as CMC7 characters, the reader comprising a path suitable for receiving and driving a document carrying such characters through predetermined positions, a premagnetization transducer for premagnetizing said characters, a read transducer for reading said characters, and electronic control and processing means connected to said transducers, the improvement wherein said path for receiving the document includes wheels having axes fixed relative to a frame, and said transducers being mounted opposite a respective one of said wheels and being controllably and resiliently urgeable towards said respective wheel.
said electronic control and processing means including read means comprising: -
analog amplifier means having an anti-saturation gain characteristic; first comparator means possessing hysteresis and having a signal input connected to the output of said analog amplifier means, and a reference input receiving a reference voltage close to zero volts, an output, and an output to said reference input to provide said hysteresis; second, fast-acting comparator means having a signal input connected to the output of said analog amplifier means, a reference input connected to the output from the first comparator via a capacitative circuit including a diode, and an output connected to said input via a diode link; and logic means for providing a logic signal representative of the characters read on the basis of the output signals from said two comparator means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification