JPH036295Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a bobbin holding device used in a full-rotation hook of a sewing machine.

BACKGROUND ART A latch lever pivoted to the upper part of a center post is used to prevent a bobbin stored in a bobbin case from flying out, which is mainly seen in full-rotation hooks of the inclined hook type. Figures 5 and 6 show an example of this, in which a slit is machined in the axial direction on the upper part of the center post a, and a cross section L is formed in that part.
A leaf spring b of the shape is caulked, and its horizontal portion is brought into elastic contact with a cam d integrally formed with a latch lever c pivoted on the upper part of the center post to hold the latch lever c at the solid line position or the dashed-dotted line position as shown in the figure. , the bobbin e is held in the position shown by the solid line, and can be attached and removed in the vertical position shown by the dashed dotted line.

Problems to be Solved by the Invention With the above-mentioned conventional device, it is not easy to form a slit in the upper part of the center post, and it is also not easy to caulk the leaf spring in a narrow space. Furthermore, if the leaf spring is too strong, it will be difficult to operate the latch lever, and if the leaf spring is too weak, it will not be possible to securely hold the bobbin, and it will also be difficult to set the spring pressure appropriately. Moreover, the leaf spring and the cam portion of the latch lever are prone to wear and deformation due to long-term use.

Means to Solve the Problems The present invention eliminates the need for slits on the upper part of the center post and caulking of leaf springs, etc., making manufacturing easier, and also creating a bobbin with a structure that does not require the use of springs. This holding device is characterized in that a latch lever, which is pivotally supported on the upper part of a center post, is attracted to an inner pot or a bobbin case, or both, by a magnet, thereby holding the bobbin.

Embodiment In the embodiment shown in FIGS. 1 and 2, a latch lever 4 is pivotally attached to the upper part of a center post 3 of a bobbin case 2 attached to an inner hook 1 so that it can be opened and closed in the vertical direction, and the latch lever 4 of the inner hook 1 is connected. When the latch lever 4 is moved to the solid line position shown in the figure and the magnet 5 attracts the bobbin 6, the bobbin 6 is held, and when the latch lever 4 is raised, the bobbin 6 is held.
In order to make it easier to raise the latch lever 4, the tip of the latch lever 4 protrudes to form a hook in the illustrated embodiment.

In the embodiment shown in FIG. 3, magnets 8 are embedded in the joints of the latch lever 4 to the bobbin case 2 and the inner hook 1.

In the embodiment shown in FIG. 4, a center post 12 is provided protruding from an inner pot 11, a latch lever 13 is pivotally attached to the upper part of the center post 12, and a magnet 14 is embedded in the portion of the inner pot where the latch lever 13 is joined.

In each of the above embodiments, the magnet is provided on one side, but the magnet may be provided on both sides. In addition, some or all of the surfaces that are connected to the magnet, such as the latch lever, inner pot, and bobbin case, must be made of magnetic material such as iron, but other body parts may be made of non-magnetic material such as plastic. .

Effects of the invention As described above, according to this invention, it is only necessary to mount the latch lever on the upper part of the center post, and there is no need for any other attachment or machining, resulting in a simple structure and easy manufacturing. Become. In addition, there are fewer parts that are worn or deformed due to opening and closing of the latch lever, and the bobbin can be held reliably for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the first embodiment, Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is a longitudinal sectional view of the second embodiment, Fig. 4 is a longitudinal sectional view of the third embodiment, and Fig. 5. 6 is a plan view of the conventional example excluding the inner pot, and FIG. 6 is a sectional view thereof. 1... Inner pot, 2... Bobbin case, 3... Center post, 4... Latch lever, 5... Magnet,
6...Bobbin, 11...Inner pot, 12...Center post, 13...Latch lever, 14...Magnet.

Claims (1)

[Scope of utility model registration request] A latch lever is pivoted to the upper part of the center post that protrudes from the inner pot or the bobbin case attached to the inner pot, and when the lever is raised, the bobbin cannot be attached to or removed from the inner pot or the bobbin case, but when the bobbin is pushed down again. In the bobbin holding device of a sewing machine, which sometimes holds the installed bobbin, a magnet is embedded in at least one side of the inner pot or bobbin case and the latch lever, which the latch lever touches when the latch lever is pushed down, and the latch lever is held by the magnet. A bobbin holding device that is attached to an inner pot, a bobbin case, or both.