Medium Duty Zero Pressure Live Roller Accumulator, Roach Model SZ196ZPA Smart Zone™

Roach Model SZ196ZPA Smart Zone® conveyor safely accumulates packages with zero back pressure utilizing zone singulation operation

TYPE: Accumulation Conveyors

MODEL: Roach Model SZ196ZPA Smart Zone™

The 196ZPA SMART ZONE™ live roller conveyor accumulates packages using zero backpressure and zone singulation operation.

The most common type of zero pressure conveyors use rollers to transport  containers while using a retro-reflective photo eye to accumulate the products into zones.  The first box travels down the conveyor and stops at the last photo-eye.  The next box comes down the conveyor and stops at the previous photo-eye, not touching the first box, hence the term zero-pressure. This is very important when trying to convey various sizes and weights of product as the boxes should not come into contact with each other.


  • Accumulates packages with zero back pressure
  • Utilizes zone singulation
  • Can transport loads up to 125 lbs/ft. effectively
  • No weight limitations
  • The SMART ZONE™ replaces sensor rollers with photoelectric sensors to accumulate products with difficult minimal weight restrictions
  • Easy to install
  • Zero pressure conveyors use sensors to segregate the conveyor into zones that accumulate product


  • Beverage
  • Brewery
  • Winery
  • Dairy products
  • Glass bottle
  • Food processing
  • Food/Vegetable processing
  • Package handling
  • Carton transporting
  • Converting plants
  • Manufacturing 
  • Distribution


  • Tread Rollers: 1.9” dia. x 16 ga. steel, model 196S
  • Pressure Rollers: 1.9” dia. x 16 ga. steel, model 196S; 8” BF with 6” wide belt.
  • Belting: 6” wide black PVC-120 COS.
  • Drive Pulley: 4” dia. with 1-3/16” dia. shaft or 8” dia. with 1-7/16” dia. shaft, both crowned and fully lagged
  • End Pulley: 4” dia., crowned, with 1-3/16” dia. shaft.
  • Return Rollers: 1.9” dia. x 16 ga. steel, model 196S, adjustable
  • Bearings: All pulley bearings are precision, heavy duty, lubricated, ball bearing units with cast iron housings
  • Speed: 60 FPM, constant
  • Accumulation: Zone singulation operation; 2’-0” long zones. 1’-0” of live roller over end plates at each end of conveyor remains “live” during operation (# of zones x zone length + 2’ = overall conveyor length). Zones are pneumatically actuated using photo electric sensors. 
  • Bed: 7” x 1-1/2” x 12 ga. channel frame slotted for tread rollers to pop-out. When unit is installed at 7’-0” elevation or higher, rollers must be retained in conveyor frame. Specify desired elevation. Bed sections attached with couplings and floor supports.
  • FRL: Unit is provided with filter, regulator, lubricator with 1/4” ports.
  • Pneumatic Actuation: Maximum air line pressure should not exceed 30 PSI.
  • Squaring Rods: Adjustable rods on underside of bed allow frame to be squared for improved belt tracking and are standard on all units over 30’.
  • Motor Drive: 1/3 HP, 230/460/3, 60 cycle, ODP right angle gear motor.
  • Roller Chain: Drive pulley is driven by No. 50 roller chain for 1-1/2 HP or less and No. 60 chain on larger drives. Chain take-up provided on motor base.


  • Accumulation: 30” and 60” zones available in 3” and 6” roller centers; 40” and 60” zones available in 4” roller centers.
  • Slug Release: Products may be slug released rather than individual product release in normal zone singulation; accumulation mode will not be disturbed when slug release option utilized.
  • Belting: 6” wide black PVC-150; 12” wide PVC-120.
  • End Drive: Mounted underneath conveyor. Minimum possible height is 20” TOR for underneath mounted end drive. Belt take-up required for end drive (if substituting end drive for center drive).
  • Auxiliary Take-Up: Provides 24” of belt take-up; specify location. 
  • Floor Supports: Supports, knee brac-es, casters and polytier supports available. See Conveyor Accessories.
  • Ceiling Hangers: 5/8” dia. threaded rod with hardware to attach rods to conveyor. Provides 6’ clearance between ceiling and TOR (furnished in place of floor supports). See Conveyor Accessories.
  • Galvanized Rollers: Both tread and pressure rollers available in galvanized steel, model 196G. Specify tread only or both tread and pressure rollers.
  • Tread Rollers: 1.9” dia. x 12 ga. steel tread rollers, model 192S, available in Model SZ192ZPA SMART ZONE®.
  • Speed: Constant speed 15-120 FPM; DC variable speed; AC inverter variable speed. Other constant or variable speeds available. NOTE: Capacity changes with speed.
  • Motors: Available through 3 HP in TEFC, explosion proof, dirty duty, brake motor, 115/230/1, 575/3, etc.
  • Defused SmartZone: Photoeyes mounted below tread rollers.

For more information on the Model SZ196ZPA Medium Duty Zero Pressure Live Roller Accumulator SmartZone™ Conveyor, please contact a Thomas Conveyor & Equipment Automation Engineer at 844 220 0086 or click on the Contact Us button above.

QUESTIONS? CALL 844-220-0086