JPH05156Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications This invention relates to a needle thread guide for sewing machines.

Prior Art On the needle thread path from the spool to the needle of a sewing machine, there are
Several needle thread guides are provided at locations where the direction of the thread changes or where it is necessary to prevent the thread from coming off the needle thread path. One example is a thread guide incorporated in a thread take-up device as shown in FIG. This thread take-up device reciprocates in the horizontal direction in conjunction with the upper shaft, and when it moves forward, it captures the needle thread 2 passed through the thread guide 1 and pulls it inside the thread take-up cover 3 to absorb thread slack. It is designed to tighten the thread and release it during the double movement to loosen the thread.
The thread take-up cover is provided to prevent the loosened needle thread from hanging down and catching on other parts of the sewing machine, and is integrally molded from resin to reduce production costs. Thread guide 1 incorporated into thread take-up cover 3
Since wear resistance is required, it is usually made of metal and formed separately from the balance cover 3, and is attached to the balance cover 3 by screwing. Utility Model Application Publication No. 61-67683, which can be installed with one touch, has a pair of insertion parts forming an engaging part, and each insertion part is attached to a pair of insertion parts protruding from the sewing machine. A device in which the device can be inserted and removed is disclosed.

Problems that the invention aims to solve When installation is done using screws as described above, a tool is required to screw in the screws in addition to the screws, and usually several screws must be screwed in order to fix the device. Must be.

1986 Utility model that can be installed with one touch
In the case of the one shown in No. 67683, if the insertion is loose, it will come out easily, and if it is too tight, it will be difficult to insert and remove. Considerable manufacturing precision is required to ensure that it is easy to insert and remove, and that it does not easily come off when installed.

The object of the present invention is to provide a thread guide that requires less precision in manufacturing and can be installed with a single touch.

Solution to the Problem The thread guide of the present invention is made by bending an elastic plate material from the middle part to form insertion parts on both sides, and cutting grooves from the bent parts to form thread introduction grooves. The device is formed on a component and can be attached by elastically deforming both insertion portions and inserting the insertion portion with a different spacing between the tips of the two insertion portions with a different spacing from the spacing between the tips of the two insertion portions. be.

In order to ensure that the thread guide can be attached reliably, a protrusion is provided on either the insertion part or the inserted part, and a recess such as a recess or small hole is provided on the other side, into which the protrusion fits and locks. Preferably, the portion is force-fitted into the recess.

As long as the thread guide is provided with insertion parts at regular intervals on both sides, the bent part at the middle part may have any shape, but preferably the overall cross-sectional shape is U-shaped, U-shaped, It is formed in a symmetrical shape such as a V shape.

Embodiment Each of the figures shows a thread guide that is incorporated into a thread take-up cover.The thread guide 11 of the embodiment shown in Figs. 1 and 2 has a U-shaped cross section and is slightly expanded toward the free end. It is made of a plate spring body with a dogleg-shaped introduction groove 12 formed on the side, and is U-shaped, with tongues 13 protruding from both sides of the side, and the upper and lower free ends facing outward. It is slightly warped. On the other hand, the thread take-up cover 14 to which the thread guide 11 is assembled has a U-shaped cross section, and a flat groove 16 communicating with a window 15 formed on the side surface is formed on each opposing inner surface of the upper and lower shelves 14a, 14b. The thread guide 11 is inserted from the window side with its free end narrowed, and the upper and lower shelves 14a and 14b also have an opening 17 narrower in width than the window 15 and the flat groove 16. The introduction groove 12 of the thread guide 11 inserted through the opening 17 is exposed from the side surface.
The balance cover 14 is also formed with recesses 18 on both the left and right sides of the window 15 into which the tongue pieces 13 fit, and the ends of the flat grooves 16 on the free end side face outward in correspondence with the free end of the thread guide 11. It has a gently curved R shape.

The present embodiment is constructed as described above.
When assembling the thread guide 11 to the thread take-up cover 14, the thread guide 11 is attached to the thread take-up cover 14 with the free end of the thread guide 11 being narrowed.
The yarn guide 11 is forcibly inserted through the window 15 of the flat groove 11. When the free end of the yarn guide 11 is pushed in until it reaches the R-shaped portion of the flat groove end, the yarn guide 11 is compressed.
When the tongue 13 is fitted into the recess 18, it is pressed against the bottom surface of the flat groove and fixed therein.

3 and 4 show another embodiment, in which the thread guide 21 is formed in a normally closed state, contrary to the above embodiment, without warping the free end. On the other hand, the left and right edges of the opening 23 of the thread take-up cover 22 are formed in a step shape, and the thread guide 21 is attached by force-fitting the free end of the thread guide 21 into the stepped portion from the outside so as to cover the opening 23. It has come to be done by doing.

5 and 6 show other embodiments.
In the embodiment shown in Fig. 4, the free end of the thread guide is slightly curved outward, and small holes 32 are bored in the upper, lower, left and right edges of the thread take-up cover 3.
3 has protrusions 35 that fit into the small holes 32 on the protruding pieces 34 of the stepped portions on both left and right edges of the opening. The thread guide 31 is attached to the thread take-up cover 33 by placing the upward and downward curved free ends against the projecting piece 34 and pushing them in.
The upper and lower free ends climb over the protrusion 35 and pass through the small hole 32.
It is adapted to be locked when the protrusion 35 is fitted into the .

The thread guides in each of the above embodiments are all built into the thread take-up cover, but they are attached to the sewing machine frame or to an attached part formed or fixed to the sewing machine frame in the same manner as in the above embodiments, and the thread guide from the bobbin to the needle is connected to the sewing machine frame. It can also be used as a thread guide placed on the path.

Effects of the invention As described above, the thread guide of the invention can be installed in one-touch and securely by simply pushing it into the sewing machine frame or sewing machine parts with the insertion part elastically deformed and the spacing between the tips changed. In addition, the spacing between the tips of the insertion portions only needs to be appropriately different from the spacing between the inserted portions, and there is no need for them to match, which eases manufacturing accuracy and facilitates manufacturing.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the thread guide before it is attached to the thread take-up cover, Fig. 2 is a side view of the same, Fig. 3 is a perspective view of another embodiment, Fig. 4 is a side view of the same, and Fig. 5 is a perspective view of another embodiment. FIG. 6 is a perspective view of the embodiment, FIG. 6 is a side view of the same, and FIG. 7 is a plan view of a thread take-up device which is an example of how the thread guide is used. 1, 11, 21, 31... Thread guide, 3, 1
4, 22, 33... Balance cover, 12... Introduction groove, 13... Tongue piece, 17, 23... Opening, 18
... Depression, 32 ... Small hole, 35 ... Convexity.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An elastic plate is bent from the middle part to form an insertion part on both sides, and a cut groove is made from the bent part to form a thread introduction groove, and a sewing machine frame or a sewing machine part is manufactured. an upper thread guide for a sewing machine which is attached by elastically deforming both inserting parts and inserting the inserted parts with a different spacing between the tips of the inserting parts with a different spacing from the spacing between the tips of the above-mentioned inserting parts. . (2) The sewing machine according to claim 1 of the utility model registration claim, wherein one of the insertion part and the inserted part is provided with a protrusion, and the other is provided with a recess such as a recess or small hole into which the protrusion fits and locks. Needle thread guide.