Panel Builder US

January 18, 2021

On any production line, it's imperative to keep things moving. No-reads caused by faulty barcodes or unreliable readers can significantly hamper production by wasting both time and materials. Fortunately, there are several possible solutions for barcode reading problems, depending on what's causing the issue.

In some cases, a readable barcode may receive a no-read result simply because of its position relative to the reader. Some readers have unique requirements for focal distances (which are often limited by internal optics), angles or orientations. The reader’s depth of field determines where it must be positioned in order to decode reliably.

Reading angle and barcode presentation angle can have an impact

In addition to the distance, the angle at which a barcode reader scans or captures images of a symbol can also impact its read performance. Mounting a reader perpendicular to a code may cause specular reflection that can hamper its ability to capture the entire code in high enough contrast. This would cause a no-read result even if the code is flawless.

No-reads can also occur if a barcode is presented to the reader at a particular rotation or orientation that’s not accommodated by the reader’s technology. Laser barcode scanners, for instance, must always be oriented so that the laser’s scan line is perpendicular to the bars of the code. If the scan line doesn’t cross all symbol elements, it won’t be properly decoded.

Possible solutions for reading position issues

It’s important to refer to a barcode reader’s technical specifications to make sure that the limitations and requirements of its position relative to a code won’t be a problem. If application constraints are a major concern, you can employ a barcode reader that’s designed for unpredictable distances, angles and orientations.

For instance, barcode readers with built-in autofocus can reliably decode symbols at variable distances within their depths of field without manual focal adjustment. Even more capable are liquid lens autofocus barcode readers, which contain actual liquid that gets manipulated to change the lens curvature and adjust it to practically infinite focal distances.

Managing applications with space constraints

Applications with varying read angles and specific mounting requirements may benefit more from barcode imagers than laser scanners. Imagers use built-in cameras to capture images of codes rather than relying on reflective laser beams, so they’re less likely to be obstructed by specular reflections when the imager is mounted perpendicular to the code.

Barcode imagers can also read codes in any orientation, and therefore don’t need to be mounted at the same rotation as the code to ensure a reliable read. In fact, they’re often the best choice in applications where codes are hand-applied to parts or where parts are fed into equipment in unpredictable orientations.

For applications with space constraints and geometric challenges, mounting options may be severely limited. Right-angle mirrors can be incorporated in these cases to help readers “see” codes even when they’re not positioned in direct view of them. Many readers use special algorithms to decode mirrored images of barcodes that appear “flipped.”

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https://automation.omron.com/en/us/blog/barcode-positioning-tips

 

Editor's Pick: Featured Product News


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The Compax3 Servo drive is far from a new product. Developed by the Electromechanical and Drives Division Europe, Parker's global servo drive platform is widely used in industrial manufacturing to control motorized processes in automated assembly, including robotics and the machining of parts. Parker’s customers are well-acquainted with the benefits of the drives used in packaging, the production of sheet goods and the operation of printing presses, as well as automated testing equipment for both automotive and consumer goods.

Recently however, the Compax3 has found new purpose in healthcare and life sciences markets where precise and safe movement is paramount. The drive’s flexibility, accuracy and comprehensive list of safety features has led to its adoption in positioning tables, exercise equipment and therapy devices.

A Chinese medical equipment manufacturer has designed an effective, efficient rehabilitation device with intelligent feedback that relies on Parker parts for safe, stable and reliable motion control.

For some people with physical disabilities, appropriate exercise training with rehabilitation equipment can prevent muscle atrophy and improve muscular strength and dexterity in upper and lower limbs. Different patients require varying levels of intensity and training modes.

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In the past, enclosure accessories were limited to being Recognized Components which might have required the end user to initiate additional evaluation in order to allow the use of these products. The new certification for environmental-rated accessories for enclosures utilizes the UL Listing Mark, so enclosure accessories can be installed without further evaluation.

New Listing Certification for US and Canada (FTTA/FTTA7)

This new Listing certification for enclosure accessories assists manufacturers who utilize Type or IP rated enclosures (for example, Types 3R and 4X or IP55 and IP66) in being able to use Type or IP rated enclosure accessories such as window kits, hole plugs, filter fan kits, etc. The benefits of this new Listing certification are two-fold: it is more cost efficient for manufacturers and it can also accelerate market access for end users.

Types of Listed Products

  • • Bolts • Breather Vents • Drain Vents
  • • External Mounting Means • Filter Fan Kits • Gasketed Screws
  • • Gland Plates • Hole Seals • Overlays
  • • Rain Shrouds • Sealing Washers • Ventilation Kits
  • • Window Kits


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PBUS-26-Schurter-DKIV1Phase-400.jpg

SCHURTER expands its range of current-compensated chokes for printed circuit board mounting, to include a vertical design for 1-phase high current applications. The new DKIV-1 sports a compact design and smaller footprint due to its vertical orientation. The series is available with a ferrite or nanocrystalline core for a wide range of rated currents from 10 A to 50 A.

Like all other aspects of today’s electronic design, the power circuit is oftentimes built using discrete components on printed circuit boards. With the trend toward integrating components, to achieve smaller and smaller form factors, thermal problems and high current on the PCB can become a challenge. Traditional block filters might well address these challenges, but their larger package size also presents challenges due to the mentioned space constraints; therefore, an effective asymmetrical common mode choke, together with capacitors mounted on the PCB, offer a better solution.

The DKIV-1 series is suitable for use in any application requiring EMC asymmetrical inductance. Application examples include frequency converters, charging stations, UPS systems and switching power supplies. The DKIV-1 is an ideal solution for multistage filter applications, where the combined use of a vertical choke (DKIV series) and a horizontal choke (DKIH series) reduces the mutual interference of the magnetic fields caused by the individual chokes.

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