JPS5830548Y2 - Sewing machine feed mechanism - Google Patents

Description

[Detailed description of the invention] This invention works in cooperation with the feed dog that performs four feed movements under the presser foot to clamp the fabric, moves in the feeding direction following the movement of the fabric by the feed dog, and then lifts the fabric. This invention relates to a feed foot for a sewing machine that can prevent the lower layer of cloth from shifting.

In general, sewing machine fabric feed is carried out by a feed dog that performs four feed movements floating above the throat plate and moving in the feed direction while holding the fabric between it and the presser foot. Since the fabric is not configured to move in the feeding direction simply by pressing the fabric, when the fabric is fed, misalignment in the feeding direction is likely to occur between the lower fabric shoulder on the feeding dog side and the upper layer on the presser foot side.

To solve this problem, a feed foot is provided to hold the cloth instead of a presser foot when the cloth is fed, that is, when the feed dog rises, and the feed foot is moved to follow the movement of the cloth, thereby eliminating the misalignment of cloth feed. This is shown in Utility Model Application No. 108864/1983.

This invention relates to an improvement of the device described in the above-mentioned publication, and provides a device with a new structure in which a magnet is used to perform the backward movement of the feed foot after it moves to follow the cloth feed. That is.

The first embodiment shown in Figs. 1 to 5 utilizes the property that magnets that attract each other easily slide by applying a slight external force, and immediately move back when the external force is released after sliding. It was designed to make a return movement of
The details will be explained below based on the drawings.

In the figure, reference numeral 1 denotes a support stand detachably attached to a presser bar (not shown), a presser lever 2 is engaged on one side of the front surface of the support stand, and a needle bar (not shown) is engaged on the other side. Swing levers 5 that swing as the needle bar moves up and down are pivotally connected to each other.
By engaging with a cam portion 3 at one end, the presser lever can be pivoted counterclockwise, thereby causing a presser portion 4 formed on the other side of the presser lever to move the feed foot (described later) onto the fabric. It is designed to be pressed so as to press it against the surface.

A presser foot 9 is also attached to the support base 1 with mounting plates 8, 8 attached to both the front and rear sides, and the presser foot 9 accommodates a feed foot 11 in a hollow portion 10 that is open at the bottom. The feed foot has a handle 12 that protrudes from the presser foot, and is pivotably connected at one end to a stand 15 that supports a magnet 14, and is supported by the attraction action of the magnet 14 or by a separately provided spring (
(not shown), it is supported by coming into contact with the presser portion 4.

Reference numeral 16 denotes a convex portion formed at the contact portion of the handle portion 12 with the presser portion 4. The convex portion is formed in a semi-cylindrical shape and makes line contact with the presser portion 4, and as described later, the feed foot 11 Frictional resistance when moving following the cloth 19 is reduced.

A magnet 19 is further fixed to the bottom of the support base 1,
The magnet 14 is set so that the magnetic poles of the opposing parts are opposite to each other in order to attract each other.

The magnets 14 and 19, which are attracted to each other in this way, easily slide due to the above-mentioned properties of the magnets by applying only a slight external force to the feed leg, and immediately return to the movement when the load is released.

20 is a feed dog, 21 is a throat plate, and 22 is a needle.

Next, the operation of this device will be explained.

When the feed dog 20 rises above the throat plate 21, the needle bar (not shown) is in the raised position and the swing lever 5 is pivoted clockwise.
As a result, the presser foot lever 2 is pivoted counterclockwise, the presser foot 4 presses down the convex portion 16, the feed foot 11 protrudes below the presser foot 9, and the cloth 17 is clamped between it and the feed dog 20. .

When the feed dog 20 moves in this state and cloth feed is performed,
The feed foot pressed against the upper surface of the cloth by the presser foot 4 moves in the feed direction as the cloth moves (see FIG. 4).

Next, cloth feeding is stopped by the descent of the feed dog to the lower surface of the throat plate, and when the needle bar descends, the swing lever 5 pivots counterclockwise, and the pressing operation of the feed foot 12 by the presser foot lever 2 is released. The feed leg 12 is lifted upward by the attraction action of the magnets and returned to its original position by the mutual action of the magnets (see FIG. 5).

In the second embodiment shown in FIG. 6, the repulsive force of the magnet is used to move and return the feed leg. The magnets 27 and 27 are set so that the opposing portions of the magnets 26 have the same magnetic pole.

As a result, the magnet 26 normally receives the repulsive force of the magnet 27 from both sides, and is maintained in a balanced state at an intermediate position. However, this balanced state is extremely unstable and can easily change with a slight external force, so the feed foot 28 The movement associated with cloth feeding is easily carried out, and after the movement, when the feed foot is separated from the cloth surface and the load is released, the magnet 26 immediately returns to its original position due to the repulsive force of the two magnets 26 and 27 that have approached each other, and is returned to the above-mentioned intermediate position. is maintained in an equilibrium state.

As described above, this idea involves attaching a magnet to the feed foot that is pressed down in conjunction with the needle bar when the feed dog rises and holds the fabric between the feed dog and the feed foot, which attracts or repels the magnet. A magnet is provided to hold the magnet in a slidable manner, and when the cloth is fed, the feed foot moves to follow the cloth, preventing the upper and lower layers of the cloth from shifting, and the feed dog descends. After the cloth feed stops, if the feed foot separates from the cloth, it can immediately return to its original position due to the magnetic action.

In addition, in the first embodiment, even if one of the magnet 14 supported on the stand 15 and the magnet 19 fixed to the support stand 1 is made of a magnetic material such as a piece of iron, the same effect as in the above embodiment can be obtained. be able to.

[Brief explanation of the drawing]

The figures show an embodiment of the feed foot of the sewing machine of the present invention. Figure 1 is a plan view of the first embodiment, Figure 2 is a front view thereof, Figure 3 is an exploded perspective view, and Figure 4 is a cloth FIG. 4 shows the state when cloth feeding is stopped, and FIG. 6 is a schematic diagram of the second embodiment. 1... Support stand, 2... Presser lever, 4
... Presser section, 5 ... Swing lever, 9.
...Presser foot, 11...Feed foot, 12...
...Handle, 14...Magnet, 15...
- Base, 16... Convex portion, 19... Magnet,
25...stand, 26.27...magnet, 2
8...Okuriashi.

Claims (1)

[Scope of utility model registration request] 1. It has a support base that is removably attached to the presser foot and is equipped with a presser foot and a magnetic body, and a feed foot that moves up and down in synchronization with the feed dog, and the feed foot engages with the needle bar and moves the needle bar. It is pressed down under the presser foot by a lever device that operates in conjunction with the vertical movement, and the cloth is held between it and the feed dog that rises above the throat plate, and a magnetic body is attached to the cloth. The magnetic body is attached to the support base, and while in normal conditions it tries to be held in a predetermined position by magnetic action, when the fabric is fed, a load is applied by the above-mentioned feeding legs that try to keep up with the moving fabric. A sewing machine's feed foot mechanism that can slide. 2. The feed foot mechanism for a sewing machine according to claim 1, wherein at least one of the magnetic bodies is formed of a magnet, and both are set so that the magnetic poles of their opposing parts are opposite to each other. 3. The above-mentioned magnetic bodies are all formed of magnets, and the magnets attached to the support stand are provided on both sides of the magnet attached to the feed leg on the movement path, and the magnetic poles of the opposing parts are the same. The feed foot mechanism 4 of the sewing machine according to the registered claim 1 is set so that the feed foot is pivotably supported by the magnetic body and is always urged to be attracted by the magnetic action of the magnetic body. A feed foot mechanism for a sewing machine according to claim 1.