Knitting technology, Third Edition

19.18
The Tsudakoma TFK machine
The first automatic V-bed machine to operate 
without cam boxes
, the model 
TFK
,
was demonstrated by the 
Tsudakoma Corporation
at the 1995 ITMA exhibition.
The 
Asahi Chemical Industry Co.
supported its earlier development. The model
TFK
has a working width of 122 cm (48 in) in gauges 7, 8, 10 and 12, with a maximum
variable speed of 1.2 m/sec.
Individual linear electric motors drive the needles in their tricks (Fig. 19.13) The
computer and control system regulate the linear motors to simulate the conven-
tional actions of the knitting and transfer cams.
As each course of knitting takes place, the knitting curves or 
waves
of the needles
are clearly visible. The machine is fitted with 12 or 16 yarn carriers on four double-
sided rails. Each yarn carrier is driven by its own quick-start step motor, via a

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Knitting technology
toothed belt. The yarn runs from the package to the yarn guide in a direct line via
a yarn tensioner and knot catcher.
The machine computer synchronizes the needle clearing with the yarn carrier
drive. Stitch length is programmed for each needle, with the linear motor allowing
the needle to draw whatever loop length is required. Up to 30 different stitch lengths
can be drawn across the knitting width. The stitch length ranges up to 8 mm in 
0.1 mm graduations.
There is a moveable holding-down sinker between every two needles, each of
which is driven by its own linear motor. They can be used for accumulated tuck
stitch fabrics or, when knitting without the takedown system, needle bed racking by
means of a step motor can take place over up to 7 needles in either direction.
Knitting begins with the start-up comb engaging the first course of the fabric,
which is then taken over by the sub-assembly and final takedown mechanism. All
have individually-programmed motor drives. When the garment component is com-
pleted, the yarn ends are clamped and severed by an automatic cutting device. The
Needle position control
to Yarn Carrier 1
Needle position control
to Yarn Carrier 2
Yarn Carrier 1
Yarn Carrier 2
knitting needle
fabric
Linear motor
Direct command to linear motors
Computer
Servo motor
Timing belt