Machine Vision

Machine vision covers cameras, code readers and image-based sensors that identify or inspect parts automatically. Seven Star LLC in Oman lists fixed-mount code readers such as the Keyence SR-X100 autofocus 2D code reader and the SICK Lector63x image-based code readers, which read 1D barcodes and 2D codes such as Data Matrix and QR for traceability. SICK vision sensors such as the InspectorP62x, TriSpector1000 and Visionary 3D cameras, laser scanners and RFID read/write devices are being added to the range, and other models can be sourced on request.

Where 2D code readers and vision sensors are used

A fixed-mount code reader is placed over a conveyor, at a packing station or inside a machine, and sends the decoded data to a PLC or a tracking database each time a part passes. Typical uses are tracking serialized components through assembly, verifying labels on cartons and pallets, and reading direct part marks, which are codes laser-etched or dot-peened into metal. Direct part marks are harder to read than printed labels because contrast is low and the surface reflects light, so the reader’s lighting and decoding algorithm matter. Autofocus models adjust to the reading distance without manual lens setting, which helps when product height changes between batches.

Selecting a machine vision code reader

Define the code type and the smallest module (cell) size, the reading distance and field of view, whether parts are moving and at what speed, the surface and marking method, and the interface to the control system, for example an Ethernet-based fieldbus or a serial link. Plants in the GCC that send a sample image of the code together with these figures receive a more accurate model proposal.