Lewis 17 - Page 27

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tension staff 1553 (See Plate 7, page 40). Aiter making this adjustment,
it will generally be necessary to retime the hook.
93. The timing of the hook, which is actuated by the shaft on
which gear -1024 is mounted, is provided by the lower gear 1028, Figure
K, as per instructions in paragraphs 45, 46, 47.
THREAD BREAKAGE: HOW TO OVERCOME
94. Aiter considerable service
the needle will be inclined to cut a sharp
edge in the groove of the needle guide,
causing thread breakage. When this
occurs, we recommend replacing needle
guide, Figure S which can be done at a
very small cost. However, if new needle
guide is not conveniently procurable,
smooth the groove with emery cloth to
eliminate sharpness.
FigureS.·
GUIDE .
95. When thread breakage occurs, check up on the parts
through or over which the thread passes, to see if they have become
sharp. We refer to the following parts: needle guide, needle clamp
and thread guide, thread take-up, bobbin case retainer 1057 and the
needle.
96. Thread breakage may be caused by the bobbin being too
tight in the bobbin case. While this is not a frequent condition, at the
same time as the bobbin becomes old, it has a tendency to warp and
bind in the bobbin case. Old bobbins should be discarded.
97. Thread breakage may be caused if the h<?ok, Figure J, page
14, is improperly timed, causing the point of the hook to fail to pie~ up
the loop from the needle at the proper time. See Paragraphs 46, 47,
48 'Page 15 for timing the hook. Before timing hook, see that needle is
correctly timed to plunger. See Paragraphs 53, 54, and 55 Page 17.
98. If the bobbin is wound too full, or if the thread has become
tangled in the bobbin, thread breakage will result.
99. On a new machine just put in operation, thread breakage
may be due to accumulation of oil in the hook which must be removed
as per instructions in Paragraph 9 •
100. Thread breakage may also result if the tension of the
needle thr·ead is either too loose or too tight. Check up on.this.