Page 327 - needle bearings

Tensioner pulleys for textile machinery
NTN

Tensioner Pulleys for Textile Machinery

These pulleys are used to guide and tension the tapes
and belts driving the spindles of a fine spinning machine, Composition of nominal number
a roving frame, a false twister, etc. Nominal number comprises type code (JPUʝʝS) ,
A pulley drawn precisely from steel plate by precision dimension code (Pulley outer dia. (D) and tail code.
deep drawing is press-fitted in the outer ring of shaft Tension pulley with special-purposed holder is
bearing in in place of inner ring. represented by nominal number + tail code (holder
nominal number).
Types and construction
Single-row or double-row ball bearing is built in this JPU 90 SʴJF4S
pulley, which is internally prefilled with lithium soap base
grease. Grease is replenished through a grease hole Holder nominal number
which is internally provided in the stud. Two different
Tail code
mounting methods are available as follows for these
pulleys; one method is to bolt a pulley to the roller carrier Dimension code
of machine with holder bolt using a special-purposed
holder (Type code: JFʝʝS) and another method is to bolt Type code
directly a pulley to machine frame using the bolting hole
drilled in the stud and a corresponding hexagon head Fig. 4
bolt. A knock pin press-fitted in the stud end face is to
lock the bolt after tightened.
When a pulley is directly bolted to machine frame,
provide the hexagon head bolt center with a grease
through-hole for grease replenishing and screw a grease
nipple in its end face.
In mounting a double-row ball bearing type tension
pulley, insert the stud directly into machine frame and
tighten it with nut, without using the special-purposed
holder. Replenish grease using the box nut.

Fig. 1 Fig. 2
Single-row bearing type Tension pulley
ension pulley with holder

Box nut

Fig. 3
Double-row bearing type
tension pulley

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