JPS60864Y2 - double chainstitch sewing machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a raising and lowering device for a sickle-shaped guide member that guides a bobbin thread to a looper in a double chainstitch sewing machine.

In a conventional double chainstitch sewing machine, the sickle-shaped guide member that guides the bobbin thread to the looper is installed close to and parallel to the looper in an upright state, and is integrated with the base of the looper. When inserting the bobbin thread into the thread threading hole using the tip of your finger, it is often inconvenient to thread the thread through, and this has the disadvantage that it often affects the efficiency of sewing work.

In order to eliminate this drawback, the present invention improves the sickle-shaped guide member so that when threading the thread, the guide member can be tilted to the side to facilitate threading.

The present invention will be described with reference to an embodiment shown in the drawings. Reference numeral 1 denotes a sewing machine body, a bobbin 2 for an upper thread is provided on the minus side, and a bobbin 4 for a lower thread is provided on one side of the machine base 3.

Reference numeral 5 designates a looper provided directly below the needle 6 that moves up and down, and a groove-shaped holding frame 9 integral with the base is erected parallel to the looper at the outer end of the base 8 supported by the shaft 7. A bearing 10 is provided on the outside near the root of the frame, and the base of the guide member 12 for the bobbin thread 11, whose upper part is bent into a sickle shape, is attached to the bearing 15.
The guide member is fitted and erected within the groove-shaped holding frame 9 as shown in FIG.
3, the hook is removably fixed and held.

14 is a guide hole provided in the guide member 12 through which the bobbin thread 11 is inserted.

Since the present invention is constructed as described above, when inserting the bobbin thread 11 into the guide hole 14 of the guide member 12 as shown in FIG. If you pull it out with your fingertips, the guide member 12, which has been stopped by the spring plate 13, will come off the spring plate and fall outward as shown in FIG. 3, making it easy to insert the bobbin thread. The bobbin thread can be easily passed through the guide hole 14 with a fingertip.

After threading the thread, raise the guide member 12 with your fingertips,
When the guide member is press-fitted into the groove-shaped holding frame 9, the guide member returns to the state shown in FIG. 2, and the spring plate 13 prevents the guide member from falling over.

This sickle-shaped guide member is also provided in conventional double chainstitch sewing machines, but the base is configured integrally with the base of the looper,
Since it cannot be raised or lowered, the guide member is always in the state shown in FIG. 2, and therefore, when threading the thread, the looper becomes an obstacle, making it extremely difficult and inconvenient to insert the thread.

Therefore, during sewing work, threading the bobbin thread through the sewing machine takes time, which has a disadvantage in that work efficiency is seriously affected.

However, as described above, in the present invention, the guide member 12 can be tilted to the state shown in FIG. 3 where it is easy to pass the bobbin thread, so it is extremely easy to pass the bobbin thread through, and it is not necessary to insert the bobbin thread as in the conventional case. It does not take much time to insert the material, which has the effect of improving the efficiency of sewing work.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a front view showing the main parts of the invention excluding the cover frame, Fig. 2 is a perspective view of only the main parts of the invention, and Fig. 3 is a view with the guide member folded down. FIG. 3... Machine base, 5... Looper, 9...
...Groove type holding frame, 10...Bearing, 11...
...Lower thread, 12...Oil guide member, 13...
Spring plate, 14...Bobbin thread guide hole, 15...
...Shaft attachment part.

Claims (1)

[Scope of utility model registration request] A bearing integrated with the base is provided on the base side of the looper installed below the throat plate, and the base of a sickle-shaped guide member through which the bobbin thread is inserted and guided is pivotally supported on the bearing so that it can be raised and lowered laterally, A double chainstitch sewing machine, characterized in that a spring plate is installed on the upper side of the bearing portion to detachably hold the sickle-shaped guide member.