SINGER 15-30 Treadle Sewing Machine - Manual (Page 14)

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Sewing Machine No. 15
14
The tension on the bobbin thread is regulated by the screw (1, Fig. 8) in the bobbin case tension
spring. To increase the tension, turn the screw over to the right. To decrease the tension, turn the
screw over to the left.
When the tension on the bobbin thread has been once properly adjusted, it is seldom necessary to
change it, as a correct stitch can usually be obtained by varying the tension on the needle thread.
To Regulate the Length of Stitch
The length of stitch is regulated by the large thumb screw (14, Fig. 6) in the slot on the front of the
arm near the bobbin winder.
To lengthen the stitch, loosen this screw and move it downward. To shorten the stitch, move the
screw upward. When the desired length of stitch is obtained, tighten the thumb screw.
To Turn a Corner
Stop the machine with the needle at its lowest point. Raise the presser foot and turn the work as
desired, using the needle as a pivot.
To Regulate the Pressure on the Material
For ordinary family sewing, it is seldom necessary to change the pressure on the material. If sewing
fine silk or flimsy material, lighten the pressure by turning the thumb screw (13, Fig. 5) on the top of
the machine over to the left. To increase the pressure, turn this screw over to the right. The pres-
sure should be only heavy enough to prevent the material from rising with the needle and to enable
the feed to move the work along evenly; a heavier pressure will make the machine run hard.
To Sew Flannel or Bias Seams
Use a short stitch and as light a tension as possible on the needle thread so as to have the thread
loose enough in the seam to allow the goods to stretch if necessary.
A Stitch to Ravel Easily
can be made if desired, by having the tension on the needle thread so light that the bobbin thread
will not draw into the goods but lie straight, as shown in Fig. 15.