Bar Code Readers and Printers 

Bar Code Readers

They are classified as non-contact or contact readers. Some require a human being to operate them and others are stand -alone automatic units. Contact bar code reader are hand held wands or light pens operated by moving the tip of the wand rapidly passed the bar code on the object or document. Noncontact bar code readers do not utilizes a contacting wand to read the bar code. They focus a light beam on the bar code & a photo detector reads the reflected signal to interpret the code. The reader probe is situated at certain distance from the bar code throughout the reading process.

Bar Code Printers

Preprinted bar codes are produced by using traditional techniques such like letterpress and flexographic printing. These methods are utilized for printing labels in big quantities for product cartoons. A comparatively new technology for bar code making of metal parts in a factory makes use of a laser etching procedure. The process provides a permanent identification mark on the item that is not susceptible to damage in the harsh environments which are encountered in several manufacturing processes.