Page 262 - CTS - Sewing Technology - TP - Volume - 2-0

SEWING TECHNOLOGY - CITS

TASK 3: Practice installing the bobbin case on Zig Zag Machine (Fig 1)
1 Turn the sewing machine pulley to align the reference line on the pulley with the indent in the motor cover.

2 Hold the bobbin so that the thread spools out counter clockwise, and place the bobbin into the bobbin case.

Fig 1

3 Pass the thread through slot (1) and hook it under the tension spring (2).

4 Pass the thread back through the slot (3) and then pull it out from the thread guide.
A and B on the thread guide (4) (Guide to identification)
a Normally A should be used.
b The amount of lower thread feeding-out is greater than for A, so this is ideal for extremely stretchy materials
and medium-weight materials.
5 Check that the latch (5) of the bobbin case, insert the bobbin case into the rotary hook.
6 While holding the latch (5) of the bobbin case, insert the bobbin case into the rotary hook.
Turn off the power switch before installing the bobbin case.
The machine may operate if the treadle is depressed by mistake, which could result in injury.

TASK 4: Practice upper threading on zig zag machine (Fig 1)
1 Turn the sewing machine pulley to align the reference line (1) on the pulley with the indent (2) in the motor
cover (needle up stop position)
2 This will make threading easier and it will prevent the thread from coming out at the sewing start.

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CITS : Apparel - Sewing Technology - Exercise 36 CITS : Apparel - Sewing Technology - Exercise 36