摘要:
An upper thread (6) is guided to extend vertically by a pair of thread guides (4) vertically opposed to each other. A thread take-up lever (9, 9a, 9b, 9c, 46) is installed so that it is horizontally reciprocated across the space between the pair of thread guides. When the thread take-up lever is reciprocated, it engages the thread positioned between the thread guides to draw it in V-form during its forward travel and stops drawing the thread to form a slack in the thread in its return travel. To prevent this slacked thread portion from clinging to the thread take-up lever, a thread holding member (28, 29, 30, 31, 32, 33) or thread braking member (36, 37, 38, 41, 45, 49) made of easily deformable material and adapted to contact the thread to thereby prevent the thread from following the movement of the thread is installed at at least one position along the path of travel of the thread engaging portion (10, 10a, 10b, 10c, 50) of the thread take-up lever.
摘要:
An improved overlock machine is proposed which is easier to set a thread through a looper. The members which would obstruct the access to the looper are mounted on a movable portion (45) of a bed frame. By swinging open the movable portion (45), the obstructing members are moved to their inoperative position. A fixed knife (5) only, or both the fixed knife (5) and the movable knife (11) are mounted on the movable portion.
摘要:
An overlock sewing machine which can readily form a rolled seam with no requirement for a complicated tension adjusting operation is disclosed. In this overlock sewing machine, an auxiliary thread tensioner (15) is provided independently of a main thread tensioner (4), providing a lower looper thread (9) with thread tension which is necessary for forming an over-edge chain stitch, in the vicinity thereof. An end cam 25 is provided on a shaft 13 of a dial 12 for feed adjustment, so that an upper pawl 23 rams one portion of the peripheral edge of a tension disc 20 and expands a side which is opposed thereto for canceling tension provision to the lower looper thread (9) passed through tension discs and provides the tension only by the main thread tensioner (4) to carry out an ordinary over-edge chain stitch when a lower pawl 24 is engaged with a high lift part of the end cam 25. In a rolled seam, the lower pawl 24 is engaged with a lower lift part of the end cam 25 by a rotational operation of the dial 12, and the upper pawl 23 is detached from the tension disc 20. Thus, tension which is provided by the auxiliary thread tensioner (15) in addition to the main thread tensioner (4) is applied to the lower looper thread (9), and it is not necessary to carry out tension adjustment in switching between the over-edge chain stitch and the rolled seam.
摘要:
A full rotary loop taker assembly comprising a loop taker (11) rotatably held in a loop taker support (1), and a driver (3) for rotatively driving the loop taker as it is rotated around a rotative axis (4) intersecting the rotative axis (12) of the loop taker. The loop taker is formed on its bottom surface wall (16) with at least three angularly spaced engaging holes (17a, 17b, 17c). The driver is formed with at least three angularly spaced projections (10a, 10b, 10c) adapted to be received in the engaging holes. During the rotation of the driver, the projections are successively received in the corresponding engaging holes in such a manner as to ensure that there is always at least one projection which has been received in the corresponding engaging hole. Further, to allow passage of an upper thread loop (23), in a predetermined angular range in the rotation of the driver the respective projections are ready to escape from the corresponding holes.
摘要:
A slit (7) is formed which lies in a vertical plane and extends from an upper surface of a sewing machine frame (1) to a front surface. A tension device (5), a thread take-up spring (30), and upper and lowerthread guides (23, 24) are disposed along the direction in which the slit (7) extends. A thread take-up lever (12) is installed so that it is reciprocated horizontally across the space between the pair of thread guides (23, 25). The placement of the thread in the tension device (5), thread take-up spring (30), and two thread guides (23, 24) can be attained by simply pulling the upper thread vertically downward through the slit (7). When the thread take-up lever is reciprocated, during its forward stroke it arrests the portion of the thread positioned between the two thread guides (23, 24) and draws it in V form. During its return stroke, the thread take-up lever (12) releases the thread to allow the latter to loosen in loop form.
摘要:
An embroidering apparatus for use with a sewing machine (20) has a body (26) supported on a bed (21) and movable back and forth and laterally along guide rails (33, 35) extending perpendicularly to each other. A table (27) and a support frame (28) to which an embroidery frame (45) is attachable are mounted on the body for movement therewith. A fixed tracing needle (41) is oriented to the table on which an original pattern is to be placed. ln operation, the table can be manipulated to permit the tracing needle (41) to follow the pattern on the table (27) while the latter is being moved around.
摘要:
An overlocking sewing machine capable of easily performing rolled sewing without the need of any troublesome tension adjusting operation. This machine is provided with an auxiliary thread tensioner (15) separately from near a main-thread tensioner (4), by which yarn tension required for forming edge linking is applied to a lower looper thread (9). An end cam (25) is provided on a shaft (13) of a dial (12) for feed adjustment such that when a lower pawl (24) engages with a high lift portion of the end cam (25), an upper pawl (23) pushes in one location on a peripheral edge of tension dishes (20) to expand a side of the tension dishes opposite to the location so that the lower looper thread (9) passing between the tension dishes is released from application of tension and is subjected to application of tension only by the main-thread tensioner (4) for normal edge linking. When rolled sewing is performed, turning operation of the dial (12) causes the lower pawl (24) to engage with a low lift portion of the end cam (25) to disengage the upper pawl (23) from the tension dishes (20). Accordingly, tension is applied on the lower looper thread (9) by the auxiliary thread tensioner (15) as well as the main-thread tensioner (4), so that it is unnecessary to perform adjustment of tension at the time of switching between edge linking and rolled sewing.