The document summarizes the compound needle warp knitting machine. It introduces the machine, which was developed in 1946 and features tubular compound needles and two guide bars. It can produce 1000 courses per minute, twice as fast as bearded needle machines. The document then describes the three step loop formation process involving needle rise and guide bar swing, the overlap and return swing, and landing and knock-over. Finally, it distinguishes tricot and raschel fabrics that can be produced on the machine, with tricot using fine yarns for simple designs and raschel using heavy yarns for intricate patterns.

1. COMPOUND NEEDLE WARP
KNITTED MACHINE

2. INRODUCTION
 Compound needle warp knitting
machine was introduced in 1946,
with its tubular compound needles
and two guides bar.
 It has speed of 1000 courses per
minute being more than twice of
bearded needle machine.
 New features - double eccentric
element drive, positive warp let-
off, light spring warp tension rails.

3. LOOP FORMATION
 There are basically three steps involved, which are –
 1. Needle rise and guide bar swing:
With the sinkers forward holding down the fabric, the hooks and tongues
rise, with the hook rising faster, until the head of the latter is level with the
guide holes. The guides then swing through to the back of the machine.

4.  2. The overlap and return swing:
The guide swing to the front of the machine,
immediately, the hooks and the tongues
start to descend with the tongues
descending more slowly, thus closing the
hooks.
 3. Landing and knock-over:
The sinkers start to withdraw as
the needles descend so that the old loop is
landed onto the closed hook and then
knocked-over as it descends below the
sinker belly. At this point the under lap
occurs before the needles begin their
upward rise and the sinkers move forward
to hold down the fabric.

5. PROCESS

6. TRICOT AND RASCHEL FABRICS
TRICOT FABRIC RASCHEL FABRIC
 Fabrics with fine yarns.
 Without design or with simple
geometric design.
 Fabrics having heavy yarns.
 Intricate designs, open spacing and
surface effect patterns.

7. THANK YOU