JPS58121986A - Yarn conditioner of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a thread tension device for a sewing machine.

In recent years, there has been a general trend toward automation in the functional configuration of sewing machines, and complicated built-in threading devices are also seen, but this makes it difficult to assemble a large number of parts, ensure accuracy, and increase costs. The thread tension device of the present invention, which still has many points to be rationalized, has a simple structure and stable function that matches modern design sensibilities, and is designed to be manufactured at a low cost. It is something.

Embodiments of the thread tension device of the present invention will be described below with reference to the accompanying drawings.

1 is the base plate of the proposed thread tension device, and 2#-i is the front plate.

The base plate holder includes a portion 1a, arm portions 1b and 1b'' for attaching the front plate 2, and an ear piece 1C91C'' that are integrally formed.

3#-i elastic plate is formed with a dish-shaped surface portion 3a projecting from one end (to the left in the figure), and a cutout portion 6b is provided on the right side of the portion. 3aVi At the winding portion provided at the other end, the elastic plate 3 is wound [c is the ear piece 1c of the base plate].
, 1c'', and is fixed to the base plate 1 by a pin 4.

Then, the base plate 1#-i elastic plate 3 is placed in the middle,
The arm portion 1b+1'' is connected to the front plate 2.

(At this time, pass through the notch 3b of the elastic plate of one arm 1bFi.) In addition, in the combined body of the base plate 1 and the front plate 2, the dish support of the base plate is connected to the part 1a and the dish-shaped surface part 3a of the elastic plate. A thread tension disc 5 is disposed between them, and a disc holder 6 is provided at one end of which is fixed to the front plate 2, coinciding with the center of each of these members.

Thus, the thread loosening cylinder 7 is fitted onto the pin A with its lower end in contact with the elastic plate 6, and the dish-shaped surface part 3 of the elastic body and the thread are attached to the chain thread loosening cylinder 7. An 8#-i adjustment knob (made of flexible resin material, for example) is screwed into the 8#-i adjustment knob, which is placed in a loose relationship with the 5 adjustment plates. is slidably locked in its longitudinal direction.

Note that this is an adjustment display marked above the long hole 2sL on the surface of the front plate 2C, and the assembly of the thread tension regulator is attached to the sewing machine under the form of exposing the front side of the front plate by appropriate means. It is placed at a suitable location in the upper thread path of the frame.

The thread tension device of the present invention is constructed as described above, and its operation will be described below.

An upper thread (not shown) is passed between the thread tension disk 5 and the disk-shaped surface portion 3a of the elastic plate.

For example, if the adjustment knob 8 is now placed at the display 0 position, the knob will not press the elastic plate 3 and no pressure will be applied to the thread tension plate 5 portion. When the knob 8 is slid in the directions indicated by indications 1 to 10, the pressing force of the elastic plate of the knob increases sequentially, and the pressing force of the thread tension disc increases accordingly. To adjust the strength of this thread presser force,
The setting is determined by the position at which the knob 8 is slid and set above the long hole 2. For example, when it is desired to obtain an appropriate thread pressing force at a selected display position, by adjusting the adjustment screw 9 at the display position, The pressing force can be finely adjusted.

When you raise the presser foot lifting lever (not shown) at the end of sewing, if you associate this movement with pushing the thread releaser 7, then
The thread loosening operation is completely satisfied.

As mentioned earlier, in the conventional device, many parts were assembled and stored in a narrow space, so it was difficult to ensure the accuracy of the thread presser spring pressure, etc. However, with the present invention, the number of component parts is small, and the pressure adjustment is easy. The production cost is also low, which is a real profit hole.

[Brief explanation of the drawing]

FIG. 1 is a front view of the thread tension Wi (set) of the present invention, FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a developed view of the main components shown in Ifi11!2. 1...Base plate, 2...Front plate, 3...Elastic plate, 5
... Thread tension disc, 6... Disc holder pin, 7... Thread loosening tube, 8... Adjustment knob, 9... Adjustment screw. Patent applicant Reio Nakai, representative of Aisin Seiki Co., Ltd.

Claims (1)

[Claims] A base plate fixed to a sewing machine frame, a front plate coupled to the base plate, an elastic plate having a dish-shaped surface portion interposed between the base plate and the front plate, and a thread tension plate interposed therebetween; A thread tension device for a sewing machine in which the thread pressing force is adjusted by pressing the elastic plate by operating an adjustment knob having an adjustment screw slidably engaged with the plate.