JPS6215027Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a presser foot mechanism for a sewing machine.

The presser mechanism of a sewing machine is generally fitted into a bush 1 attached to the sewing machine so that it can slide vertically, and is normally biased downward by the action of a coil spring 3 wound between the bush 1 and the presser bar arm 2. the presser foot 4, the presser foot 5 attached to the lower end of the presser bar, the presser foot lifting lever 6, which has a cam part pivoted on the sewing machine frame that engages the presser bar arm 2 from below, and the force of the coil spring. It consists of a mechanism 7 that adjusts the presser foot pressure by adjusting the presser foot pressure.When assembling the presser foot mechanism, it is necessary to attach the presser rod
Many steps were required, such as fixing the presser bar arm, pivoting the presser foot lifting lever, and installing the adjustment mechanism.

The purpose of this invention is to simplify assembly and reduce manufacturing costs by unitizing the presser mechanism.

To explain this with reference to the drawings, it is slidably inserted into a slit 12 formed in the support plate 11,
A presser bar 14, preferably in the shape of a plate as shown, with a presser foot 13 fixed to its lower end, and a cam portion to which a tongue piece 16 protruding from the presser bar is rotatably pivoted by a stepped screw 17. 18 is engaged with the support plate 11 from above, and a presser foot lifting lever 20, which is parallel to the presser bar 14 and whose lower end is slidably inserted into the support plate 11 in the same manner as the presser bar, is preferably a plate-shaped lever. The adjustment member 21, a coil spring 25 hooked on a pin 22 protruding above the presser bar and a pin 23 protruding below the adjustment member to connect them, and a vertical coil spring 25 formed on the presser bar 14 and the adjustment member 21, respectively. Groove or vertical hole 26
an operating shaft 28 whose base is inserted into the brush 27; and a knob 31 which is fitted onto the protruding end of the operating shaft 28 and engages the eccentric cam 29 with a pin 30 protruding from the adjusting member 21. The sewing machine frame is configured as a unit, and the sewing machine frame has a rear cover 33 formed separately and detachably fixed to the main body 34, and the main body 34 has a recess in which the support plate 11 is attached, preferably as shown in the figure. A forked boss 36 into which the bush 27 is fitted is formed on both sides of the lower part of the groove 35 into which both side edges of the support plate 11 are fitted, and a circle concentric with the operating shaft 28 and integrally formed with the knob 31. Board part 3
A circular hole 38 into which the screws 7 fit is formed in each side wall. 40 is a vertical hole formed in the back cover 33 for a presser foot lifting lever.

To assemble the above unit to the frame, attach the knob 31 to the operating shaft 28 on the main body 34 with the rear cover 33 removed.
The unit that has been removed is attached by fitting the support plate 11 into the groove 35 and the bush 27 to the boss part 26, respectively, and then fitting the knob 31 inserted from the outside of the side wall onto the operating shaft 28 and fitting it into the boss part. 3
After fixing the bushing 27 fitted in the button 6 with the presser foot 42, press the rear cover 33 into the vertical hole 40 with the presser lever 20 inserted, and then press the main body 34.
It is installed on.

In the embodiment described above, the disc part 37 is integrally formed on the knob 31 and the disc part is fitted into the circular hole 38 in the side wall of the main body, or the eccentric cam is inserted into the circular hole 38 without providing the disc part. It may also be loosely fitted (FIG. 6). In this case, the circular hole 38 needs to be formed in a size that allows the eccentric cam to rotate.

Furthermore, if the circular hole in the above embodiment is formed as a horizontal hole with one side open as shown in FIG. 7, the unit can be assembled with the knob attached.

In the above embodiment, the vertical movement of the presser bar and the adjusting member is guided by passing the shaft through the vertical groove or hole formed in the presser bar and the adjusting member. It is also possible to provide a guide member for vertically movable guidance, and to fix the mounting portion of the guide member to the main body. In this case, the knob is only rotatably attached to the main body.

It is also possible to replace the knob in the above embodiment with a pin 30 protruding from the adjustment member or an operating member such as a screw that engages with the upper end surface of the adjustment member.

As described above, the presser mechanism of the present invention includes a presser bar, a presser foot lifting lever, and a spring that biases the presser bar downward.
The mechanism that adjusts the strength of the spring is configured as a unit, and the entire unit or most of it can be assembled into the frame as is, which greatly shortens the assembly process. Is possible.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional presser mechanism, Fig. 2 is a rear view of the presser mechanism according to the present invention, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is an exploded perspective view. FIG. 5 is a perspective view of essential parts of the sewing machine frame, FIG. 6 is a perspective view of a modified version of the knob, and FIG. 7 is a modified view of the knob fitting portion of the frame. DESCRIPTION OF SYMBOLS 11... Support plate, 14... Presser bar, 20... Presser foot lifting lever, 21... Adjustment member, 25... Coil spring, 28... Operating shaft, 31... Knob, 33...
...Back cover, 34...Main body, 35...Groove.

Claims (1)

[Scope of utility model registration request] A support plate 11 that is removably attached to the main body of a sewing machine frame with the back cover removed, which is made up of a main body 34 and a back cover 33; and a presser bar that is slidably inserted into the support plate and has a presser foot 13 fixed to its lower end. 14
and a presser foot lifting lever 20 which rotatably pivots the cam portion 18 to the presser bar and engages the support plate from above.
, an adjustment member 21 that is slidably inserted into the support plate parallel to the presser bar, and a spring 25 that connects the presser bar and the adjustment member and urges the presser bar downward.
and an operating member 31 for vertically moving the adjusting member.
and can be attached to the main body 34,
A presser mechanism for a sewing machine, in which a unit is constituted by a presser bar and a guide means for vertically movably guiding an adjusting member, and the entire unit can be attached to a main body 34, or the operating member 31 can be removed and assembled from the unit.