JPS6332705Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for adjusting the amount of rise of a presser foot and an upper feed foot of a sewing machine.

[Conventional technology]

In a sewing machine, the presser foot and the upper feed dog alternately move up and down to feed the cloth and sew, and the amount of rise of the presser foot and the upper feed foot is balanced according to the thickness of the sewing material. However, conventionally, the adjustment is
As shown in Fig. 3, the set screw N
Upper feed presser foot lifting arm 1 is tightened and fixed with
1, it was customary to loosen the set screw N, rotate it, change the mounting position, and tighten it again. In order to obtain the desired amount of lift, the user had to turn the sewing machine, check the actual amount of change, and then use intuition to estimate the next mounting position.While repeating this process, the desired position was found.

[Problem that the invention attempts to solve]

However, with such a configuration, the work to obtain the desired amount of rise that is balanced between the presser foot and the upper feed foot is complicated and not only wastes time and a great deal of effort, but also requires a lot of effort during tightening and untightening. The problem is that the service life of the parts is likely to be shortened, such as damage to the mounting surface of the rotating shaft due to wear of the threaded part or change in position.

[Means for solving problems]

The present invention has been made in view of the above-mentioned circumstances, and solves these problems by providing a telescopically adjustable lifting amount adjustment device that connects the upper feed presser foot lifting arm and the presser bar lifting arm with a link configuration. The purpose is to resolve the issue.

〔Example〕

Hereinafter, a rising amount adjusting device A according to an embodiment of the present invention
will be explained based on FIGS. 1 and 2.

First, to describe the structure with reference to Fig. 1, 1 is a main body having a substantially rectangular parallelepiped shape, and a long hole 1a is bored in the longitudinal direction, and a sliding groove 1m is carved on the inner surface of the long hole 1a facing oppositely. It has been done. A movable piece 2 having a mounting set screw hole 2a is slidably inserted into the groove 1m. Further, an inner flange 1t for rotatably holding an adjustment knob 3 is formed on the open end side of the elongated hole 1a of the main body 1, and the knob 3 is screwed into the moving piece 2 to prevent rotation. A threaded rod 5 fixed with a nut 4 is screwed through, and the inner rib 1t is held between the inwardly protruding rib portion 3t. The moving piece 2 is moved back and forth. In addition, at the other end of the main body,
A mounting set screw hole 6 for movably connecting to a presser bar lifting arm (not shown) is bored.

Further, a stop groove 5m is cut in the longitudinal direction at the tip of the threaded rod 5, and a claw 7t that locks into the groove 5m and an elastic stopper protrude into a bolt hole (not shown). 7 is fitted onto the tip, and the curved tip presses against the outer circumferential surface of the adjustment knob 3 to prevent rotation.

With the configuration described above, as shown in FIG. 2, the moving piece 2 is movably connected to the upper feed presser foot lifting arm 11 by the mounting set screw 10 fitted into the mounting set screw hole 2a, and This lifting amount adjusting device A is used by being movably connected to the L-shaped presser bar lifting arm 13 through the other mounting set screw hole 6 and the set screw 12.

Therefore, in order to adjust the amount of rise, after releasing the pressure contact of the elastic stopper 7 with the adjustment knob 3, rotate the knob 3 with your finger, and then move the moving piece 2 through the threaded rod 5 into the slide groove 1m. Since the upper feed presser foot lifting arm 11 and the presser bar lifting arm 13 can be easily reciprocated, the distance L between the set screw hole 2a and the set screw hole 6 can be expanded or contracted. can. In this case, since the upper feed presser foot lifting arm 11 is stationary, the presser foot lifting arm 13 will rotate. For example, in order to raise the presser bar 14 to the raised position in order to cope with thicker sewing materials, it is necessary to extend the distance L. Therefore, when the adjustment knob 3 is screwed in, the screw rod 5 pulls the moving piece 2, so the distance L is extended, and the presser bar lifting arm 13 is therefore rotated clockwise in the figure. At this time, the upper feed bar 15 does not move downward because the lower surface of the upper feed dog 16 is supported, but supports the base 13k of the presser bar lifting arm 13.
4 is raised by a lower arm 13u movably connected to the metal fitting 17. However, since the metal fitting 17 is combined with a guide metal fitting 18 that guides the roller 17c in the vertical direction, the presser bar 13 that rises together with the connecting metal fitting 17,
It won't tilt. Further, at the time when the stretching operation for the distance L is completed, the tension coil spring 19 is balanced and the connection fulcrum 17s of the connection fitting 17 is in the raised position, so the upper feed rod 15 also rises. These increases are
By providing a reference scale on the moving piece 2 and a dimensional scale on the corresponding surface of the main body 1, more precise adjustment is possible.

When the desired amount of increase is obtained, the adjustment knob 3 is again prevented from rotating by the elastic stopper 7, and the sewing machine is used.

〔Effect of the invention〕

As explained above, the present invention provides a lifting amount adjusting device in which the distance between the upper feed presser foot lifting arm and the presser bar lifting arm can be expanded and contracted by operating the adjustment knob. Since the amount of lift of the legs can be adjusted while directly checking with the naked eye, not only can the desired amount of lift be achieved extremely quickly and easily, but there is no wear and tear on parts, significantly improving work efficiency. effective.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing one embodiment of the present invention, the figure is a half-sectional front view, the figure is a plan view, Fig. 2 is an explanatory front view showing the state of use, and Fig. 3 is a conventional lift. It is an explanatory front view of an amount adjustment method. 1a...Elongated hole, 2...Movement piece, 3...Adjustment knob, 5...Threaded rod, 6...Set screw hole, 11...Upper feed presser foot lifting arm, 13...Presser bar lifting arm, L... …
Connection distance.

Claims (1)

[Scope of utility model registration request] A movable piece movably connected to the upper feed presser lifting arm is slidably inserted into a long hole drilled in the longitudinal direction, an adjustment knob is provided at one end to engage with a threaded rod protruding from the piece, and an adjustment knob is provided at the other end. A presser foot, characterized in that the presser foot has a set screw hole movably connected to the presser bar lifting arm, and the connection distance between the upper feed presser foot lifting arm and the presser bar lifting arm can be adjusted by expanding or contracting. A device for adjusting the amount of rise of the upper feed foot.