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Measuring technology for complete wheels


DOT recognition system

The inmess DOT recognition system is able to detect the tire DOT-code even under difficult production conditions, allowing a very high recognition rate to be achieved.


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DOT-Recognition System (DOT)

The DOT recognition system is used for automated recognition of the DOT coding on tire sidewalls, consisting of the “Tire Identification Number” (TIN) and the “Date of Manufacturing” (DOM). This coding consists of letters and numbers according to the DOT specification and describes the tire type, the production location and the production date.

In a fully automated process based on laser-based 3D measurement technology, the DOT recognition system finds the coding and reads the corresponding characters for a target/actual comparison of the TIN and for reading the DOM.

  • The wheel is conveyed via the infeed into the pickup stand. It is assumed here that the complete wheels are provided by the conveyor system with an accuracy of ±30 mm transverse to the conveying direction. If this cannot be guaranteed, this has a detrimental effect on the cycle time.
  • There, the wheel is centered and the outer diameter of the wheel is measured.
  • The measured diameter is compared with the inspection plan.
  • The wheel is lifted from the lifting unit, centered and clamped flat against a Vulkollan plate.
  • The tire to be measured is rotated by the complete machine at a maximum speed of 360°/s.
  • The laser sensor is mechanically positioned in the machine above the DOT code. The radial image area is approx. 60-90mm.
  • The laser sensor continuously records height coordinates during one rotation.
  • The software fully automatically identifies the position of TIN and DOM based on previously taught-in features with a read rate of >99% when reading a tire sidewall.
  • The evaluation time is a maximum of 1s, which can usually be integrated into the overall process without affecting the cycle time.
  • TIN and DOM are transmitted to a higher-level system control. If necessary, a comparison is made with the target TIN and DOM and an IO/NIO signal is transmitted to the machine.
  • The read TIN and DOM can optionally be saved for later analysis, taking into account the available memory space.
  • Each variant to be found (tire or wheel-tire combination) must be taught in once before automated recognition. This process takes place semi-automatically. This means that the software automatically creates a suggestion for the tire areas to be evaluated without the operator making any specifications for this. This suggestion is accepted or rejected by the operator. In the second case, the operator creates the areas to be evaluated manually. The automatic teach-in process usually takes less than 30s, with manual intervention within one minute. Specifications regarding font types or teach-in of fonts are not required.
  • If the “DOT” lettering does not exist on the side panel, other features can be used to determine the position of the TIN and DOM.
  • 2006/42/EG – EG-Maschinenrichtlinie
  • Code of Federal Regulations
  • Title 49 – Transportation §574.5 Tire identification requirements

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