Page 22 of Double PlusŪ Chain & Sprockets by U.S. Tsubaki

design guidelines selection guidelines x for double plus chain with snap covers when using the arrangement as shown in fig 13 be aware that the sprocket cannot engage the chain from the top surface of the snap covers when bending the chain toward the snap cover side do not bend beyond the r dimension of the plastic return guide see page 8 snap covers and installation are shown in figs 14 and 15 figure 13­take-up arrangement for limited space for double plusŪ with snap covers Ū viii sprocket and shaft driver sprockets should be keyed with both left and right sprockets matched in phase take-up sprockets should be keyless with separate shafts on left and right other sprockets should not be keyed figure 14­snap covers for outer and inner links ix maximum conveyor length double plusŪ chain operates well on conveyors with lengths not exceeding 50 ft 15 m when conveyor distances are greater than 50 ft 15 m make several shorter conveyors in line if you require one continuous system longer than 50 ft 15 m consult u.s tsubaki figure 15­proper installation of snap covers maintenance guidelines double plus with plastic rollers is designed to operate in a dry environment without contamination from water or oil otherwise the start-up function of the chain will be minimized or eliminated making conveying difficult transfer product onto double plus chain smoothly and avoid dropping heavy product onto the chain double plus with plastic rollers is designed to operate without lubrication · if the chain begins to make noise in the sprocket area because of a lack of oil lubrication may be applied carefully at the space between the link plates see fig 16 if oil gets on plastic rollers clean them immediately · steel roller double plus requires lubrication use sae 10 20 for engineering class double plus chain use sae 30 40 figure 16­lubricating double plusŪ chain 20

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