Brother TZ1 B651 Basic Repairs & Adjustments page 17

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IMPORTANT !!!
SWITCH THE MACHINE OFF BEFORE PROCEEDING WITH THE ADJUSTMENTS :
:
How A Stitch Is Formed
The needle enters the work and continues to its lowest point of travel.
As the needle starts to rise from the bottom of its stroke the thread is gently trapped in
the long groove of the needle forcing the thread on the scarf side to be thrown out into
what is known as LOOP FORMATION.
This loop can be forced to be small or large depending how long the TIMING of the hook
is.
The longer the hook takes to reach the needle the larger the loop formation will be.
Normal textile timing is usually around 2/3mm, but for heavy products such as saddlery it
may be necessary to retard the timing to even 4/5mm.
Once the thread has been successfully picked up by the hook point the hook continues to
rotate to carry the thread under the bobbin base and over the bobbin case trapping the
bobbin thread completing what is known as a LOCKSTITCH
LOCKSTITCH LOOP FORMATION
Thread
Fabric
Needle Eye
Needle
Loop Formation
Hook Pick Up
Point
2/3mm lift from
the bottom of the
needle stroke
12:1
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