System overview

Standard Knockoff

Sensor-timed reject for moderate-speed lines

SSI’s Standard Knockoff is a simple, reliable reject mechanism for moderate-speed conveyors. An upstream system asserts a fail digital output. The knockoff queues fail events and waits for the product to reach a trigger sensor at the reject point—then actuates the reject. Extend/retract confirmation sensors validate each cycle before the next reject.

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SSI Standard Knockoff system
Alternate view of SSI Standard Knockoff machine
Machine layout supports repeatable throughput and straightforward line integration.

What it solves

  • Cost-effective pass/fail enforcement at a reject point
  • Straightforward I/O integration to upstream inspection
  • Reliable reject cycling with actuator confirmation

How it works

  1. Latch fail — Upstream fail output is queued.
  2. Detect product — Product hits the trigger sensor at the reject point.
  3. Actuate — Knockoff extends; extend sensor confirms stroke; then it retracts.
  4. Complete — Retract sensor confirms cycle; next queued reject is ready.

Included vs optional

Included

  • Fail input + queue logic
  • Trigger sensor timing with adjustable delay
  • Extend/retract confirmation sensing

Optional

  • Stack light and alerting integrations
  • Additional ready/fault handshakes
  • Custom discharge/reject conveyor interface

Project inputs (for scoping)

  • Product size/weight and line speed
  • Minimum spacing between products
  • Reject discharge constraints (bin/chute/conveyor)
  • Trigger source + interlock requirements