4. Top Chains
Sprockets Use special sprockets for this chain.
If you use steel sprockets, make sure to install guide rings to prevent the chain from sliding off. This can happen if materials are unevenly distributed on the chain, or if the chain is misaligned. Split engineered plastic sprockets come with guides on every tooth or every other tooth. Therefore, guide rings are not necessary. Maintenance on split sprockets is quite simple. They are easy to install and remove from the shaft. An engineered plastic idler pulley may be substituted for the sprocket at the tail shaft. The idler pulley rotates freely, without bearings, on the fixed steel shaft. NOTE: Excessive chain tension can damage the idler pulley.
Table 4.10 TTTop Chain Characteristics
Chain Bushing Maximum Pitch Diameter Allowable
Sprocket
Number
Outer Diameter of
(mm)
(mm)
Load (kN)
of Teeth P.C.D. 10.5 129.26 11.5 141.22 12.5 153.20
Steel
Plastic Plastic Idler Wheel
130
1.47 (N-type)
142.5
154.5 (Split is available)
38.1
12.7 2.16 (SS-type)
: Available
Chains for Special Applications Special finishes on the upper part of the plate are available. The ground type has a fine finish to allow for extra-smooth sliding of conveyed bottles. The anti-abrasion finish has hard chrome plating on the upper side of the top plate.
167
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