Parchment cutter: direct linear motion review

Bright green bar: required pizza leading-edge detection

The bright green bar represents the required line-scan detection position across the conveyor. The sensing system must accurately detect the leading edge of the incoming pizzas across all three lanes. The bar identifies a functional requirement; the sensor model and final mounting position remain to be selected.

Track the product from the scan point to the cut point. The controls must use the measured distance along the conveyor from the sensing line to the blade cutting line, together with conveyor travel feedback, to track where each detected row is as it approaches the blade. TecMation should specify the encoder or equivalent position-tracking arrangement and account for sensor response, controls latency and blade travel time so parchment contact occurs at the intended location between rows.

Leading-edge detection establishes the row position. The cutting sequence must also account for pizza diameter, actual row spacing, any stagger across the three lanes and the required parchment flap. The supplier should confirm whether trailing-edge or clear-gap detection is also needed to verify that the blade path is clear. Scan-to-cut distance must be measured and calibrated on the installed machine; the animation does not validate this sensing and tracking function.

What the comparison shows

The existing system converts horizontal pneumatic actuator travel into vertical blade movement through a four-bar linkage. The proposed arrangement applies linear motor motion directly to the guided crosshead. The intended benefits are fewer linkage connections and programmable blade movement and raised-position dwell. TecMation should assess the resulting force, control and mechanical requirements.

Demonstration conditions

The new animation shows rows of three 14-inch pizzas. Its initial settings are 50 ft/min conveyor speed, a 4-inch gap between rows, a 1.5-inch blade stroke and a 250 ms down-and-return cycle. These give an illustrative 1.8-second row period and 1.55-second raised-position dwell.

These settings illustrate motion; they are not a validated operating envelope. The two illustrated motor bodies come from the supplied CAD concept and do not identify selected LinMot products. The existing simulator can be adjusted to other pizza sizes and operating conditions.

Requested supplier review

• Recommend a motor or guided module arrangement, including whether two, three or four motors are appropriate. Space is available for up to four motors.
• Confirm the total moving mass. The existing review gives a preliminary 31 lb (14.1 kg) retained crosshead and blade payload; add the moving parts of the proposed LinMot arrangement. Recalculate the previous ORCA-specific assembly allowance for the selected components.
• Size peak and continuous force, acceleration, cycle time, raised-position holding duty and thermal capacity over the required production range.
• Specify coordinated multi-motor control and load sharing for the rigid crosshead, including feedback and fault response. A shared start signal alone should not be treated as a validated synchronization method.
• Identify drives, power supplies, feedback, cables, mounting, guides, cooling and any counterbalance or holding provision required.
• Confirm blade clearance and effective cutting overtravel, parchment cutting resistance, guide friction, mechanical alignment and suitability for the flour-exposed production environment.
• Specify the full-width pizza leading-edge sensing system represented by the bright green bar, its mounting position, measured scan-to-cut distance, conveyor position feedback and tracking logic. Account for all three lanes, row stagger, sensing and control delays, blade response and the required cut position within the parchment gap.
• Provide a proposed component list, electrical requirements, quotation and an application test plan.