摘要:
A sewing machine which may employ a loop-making hook rotating about a vertical axis employs a one-way bobbin and bobbin case. A bobbin can have a larger flange and a smaller flange so as to fit in a suitably configured bobbin case in only one way. The bobbin may have a blind axial opening with a guide groove to fit a winder spindle in only one way so that the bobbin can only be wound in one way. Attempts at incorrect orientations cause the bobbin to protrude from the bobbin case in an obviously incorrect manner. Inadvertent efforts to wind the bobbin incorrectly are likely to be fruitless. Thus, a user can readily install the bobbin in the bobbin case with a proper orientation and with the thread correctly wound. Surprisingly, stitching problems, such as poor seams or the like, can be reduced.
摘要:
A sewing machine having a reciprocatory needle (9) and a reciprocatory thread-take-up device (17) to deliver thread to the needle employs a thread control device (16) located between the thread take-up device (17) and the needle (9) to engage and apply light tension to the thread. The thread control device can have two opposed plates (24,25) between which the thread runs and which cooperate to apply spring pressure to the thread, for example, a guide plate (25) and a spring plate (24). The guide plate (25) or other device can include catcher structure (37) to catch thread escaping the take-up device (17). The thread control device (17) can help control premature descent of the thread and improperly tensioned stitches.
摘要:
A new disposition is introduced into the shank of a sewing machine needle defining a shank (1), a shoulder (2), a blade (3), a clearance above eye (4), an eye (5) and a point (6). The shank (1) presents two transverse sections forming a T-shaped profile according to the sections BB and CC, and the T-shaped profile defines a unique height (G2) along an extent (S5) of the shank (1), and a unique width (S4) on a line (C1) extending along an area of a section (T1) of the extent (S5) that is equal to a width (S4) on a line (C2) of another section of the extent (S5).
摘要:
A sewing machine having a reciprocatory needle (9) and a reciprocatory thread-take-up device (17) to deliver thread (11) to the needle (9) employs a thread control device (16) located between the thread take-up device (17) and the needle (9) to engage and apply light tension to the thread (11). The thread control device (16) can have an opposed plate (25) and spring wire (24) between which the thread runs and which cooperate to apply spring pressure to the thread. Downstream thereof a thread brush (27) can be employed through which the thread runs. The thread (11) can be further lightly tensioned and laterally positioned by the thread brush (27). The guide plate or other device can include catcher structure to catch thread escaping the take-up device. The thread control device can help control premature descent of the thread and improperly tensioned stitches.