JPH02126577U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is an external view showing a sewing machine incorporating a looper thread supply amount adjusting device according to a first embodiment of the present invention;
Figure 2 is an internal configuration diagram of the main parts, Figure 3 is a configuration diagram of the looper thread supply amount adjustment device as seen from the right side of Figure 2, and Figure 4 is the opening provided in the main body case. FIG. 5 is a graph showing the thread pulling timing by the thread take-up member according to the first embodiment in comparison with the conventional one, and FIG. 6 is a graph showing the relationship between the shape of the lower looper thread locking plate and the thread drawing timing. FIG. 7 is an explanatory diagram showing the second embodiment of the present invention, and FIG. 7 is a diagram corresponding to FIG.
FIG. 8 is a view corresponding to FIG. 3 showing a third embodiment of the present invention, FIG. 9 is a detailed view of main parts showing a fourth embodiment of the present invention, and FIG. 10 is a sectional view taken along the line -- of FIG. 9. Figure 11 is a sectional view taken along the - line in Figure 9, and Figure 12 is a cross-sectional view of Figure 9.
FIG. 13 is an explanatory diagram showing a conventional looper thread supply amount adjusting device of a sewing machine. 1: Upper looper shaft, 2: Lower looper shaft, 3: Swing arm, 4: Upper looper, 7: Lower looper, 10: Main body case, 11: Opening/closing cover, 13: Thread for upper looper, 1
4: Lower looper thread, 15b, 15c: Thread tension device,
24: Main shaft, 26: Swing arm, 29: Needle bar drive shaft, 30, 58: Swing member, 35: Thread supply amount adjustment device, 36, 46, 56, 66: Thread supply amount adjustment mechanism, 37, 48 , 68a, 68b: balance member, 3
8, 75: opening, 47: crank, 57: fulcrum shaft, 61: endless belt, 67: mounting member.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A main body case in which the looper thread whose thread tension is adjusted with a thread tension device is guided along the outer surface to an upper looper and a lower looper; A needle bar drive shaft that drives the needle bar in conjunction with the main shaft; A needle bar drive shaft that drives the needle bar up and down in the same phase as the needle bar in conjunction with this needle bar drive shaft. The balance member has a sickle-shaped balance member that swings in the direction of the opening, and when the balance member moves through the opening from a first position close to the opening to a second position away from the opening, The looper thread located at the opening is hooked and pulled into the main case, and when moving from the second position to the first position, the pulled-in looper thread is released outside the main case and the looper thread is pulled into the main case. a yarn feed amount adjustment mechanism for adjusting the feed amount; the balance member is arranged so that the timing at which the lower looper yarn is pulled out from the upper looper is almost the same as when the phase is delayed by a necessary degree with respect to the needle bar. A looper thread supply amount adjusting device for a sewing machine, characterized in that the shape is set. 2. A main body case in which the looper thread whose thread tension has been adjusted with a thread tension device is guided along the outer surface to the upper looper and the lower looper; An opening that communicates the inside and outside of the case; A needle bar drive shaft that drives the needle bar in conjunction with the main shaft; A hook-shaped take-up that slides horizontally in the same phase as the needle bar in conjunction with this needle bar drive shaft. member, and when the balance member moves through the opening from a first position close to the opening to a second position away from the opening,
The looper thread located at the opening is hooked and pulled into the main body case, and when moving from the second position to the first position, the pulled-in looper thread is released outside the main body case and the looper thread is pulled into the main body case. and a thread supply amount adjusting mechanism for adjusting the supply amount of the yarn, wherein the timing at which the lower looper yarn is pulled out from the upper looper is approximately the same as when the phase is delayed by a necessary degree with respect to the needle bar. A looper thread supply amount adjusting device for a sewing machine, characterized in that the shape is set as follows. 3. A main body case in which the looper thread whose thread tension has been adjusted with a thread tension device is guided along the outer surface to the upper looper and the lower looper; an opening that communicates between the inside and outside of the case; and a sickle-shaped balance member that is linked to the main shaft and swings up and down at a timing with a required number of degrees of phase delay relative to the needle bar, and the balance member is connected to the opening. On the other hand, when moving through the opening from a first position close to the opening to a second position away from the opening, the looper thread located at the opening is hooked and pulled into the main body case, and A sewing machine comprising: a thread supply amount adjustment mechanism that discharges the pulled-in looper thread outside the main body case to adjust the supply amount of the looper thread when moving from the second position to the first position; looper thread supply amount adjustment device. 4. A main body case in which the looper thread whose thread tension has been adjusted with a thread tension device is guided along the outer surface to the upper looper and the lower looper; an opening that communicates between the inside and outside of the case; a swinging arm that swings as the main shaft rotates to reciprocate the upper looper shaft; and a swinging arm that is attached to this swinging arm so that the phase lags the needle bar by the required number of degrees. It has a hook-shaped balance member that swings left and right at a timing, and when the balance member moves through the opening from a first position close to the opening to a second position away from the opening. The looper thread located at the opening part is hooked and pulled into the main body case, and when moving from the second position to the first position, the drawn looper thread is released outside the main case. A looper thread supply amount adjustment device for a sewing machine, comprising: a thread supply amount adjustment mechanism for adjusting the supply amount of looper thread.