JPS6219339Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a presser mechanism for an overlock sewing machine equipped with an upper feed dog.

When threading the needle on an overlock sewing machine, if the presser foot is placed on the needle plate, the presser foot (or the mounting base if it is attached to the presser foot via the presser foot or a mounting base) will get in the way. This makes it difficult to thread the thread. Therefore, threading is normally carried out after lifting the presser foot lever to release the spring pressure on the presser foot, and then moving the presser foot and the attachment base to the side, but as shown in Figure 1, the upper feed dog In the type of overlock sewing machine that is placed in the through hole of the presser foot, the upper feed dog that fits therein becomes an obstacle, making it impossible to move the presser foot laterally.

In the above type of overlock sewing machine,
Since the presser foot cannot be moved to the side, the presser foot must be moved above the throat plate by depressing the presser foot lifter pedal to clear a sewing jam, remove and disassemble the throat plate, clean it, or align the looper with the needle. This is done after raising the presser foot, but the amount of rise of the presser foot is regulated by the upper looper and cannot be set large, so the space formed between it and the throat plate is small.
It was not easy to carry out the above work in such a space.

If the part of the presser foot that engages with the upper feed dog on one side of the through hole is cut out, the presser foot can be moved laterally, and the above problem can be solved, but in this case Another problem arises in that the function of the presser foot against the cloth is insufficient.

The purpose of this invention is to provide a presser foot mechanism that allows the presser foot to be moved laterally without impairing the function of the presser foot in an overlock sewing machine in which the upper feed dog is placed in the through hole of the presser foot. There is a particular thing.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a presser foot, and 2 is an upper feed dog arranged in a through hole 3 of the presser foot. The former is connected via a mounting base 6 to a presser stand 5 whose base is supported so as to be rotatable vertically and horizontally, and can move vertically and horizontally. The latter upper feed dog 2 is supported by a feed stand 7 which operates in conjunction with the sewing machine, and can move forward and backward as well as vertically.
The presser foot 1 feeds the cloth in cooperation with a feed dog (not shown) below the presser foot 1. Reference numeral 9 denotes an elastic mechanism which presses the feed table 7 by the action of an internal spring and urges the upper feed dog 2 downward. A similar elastic mechanism (not shown) is also provided on the presser table 5, which always urges the presser foot 1 downward to bring it into elastic contact with the needle plate 10.

When inserting cloth under the presser foot, it is necessary to slightly lift the presser foot and the upper feed dog, which are in elastic contact with the throat plate and feed dog, above the throat plate against the action of the elastic device. For this reason, the feed stand arm 1 is fixed to an operating shaft 15 that rotates in one direction when a foot pedal (not shown) is depressed and moves back by the action of a helical spring 13.
6 and a presser foot arm 17 are provided, and when the operating shaft rotates in one direction by pressing the foot pedal, each of the arms 16 and 17 pivots upward, and the feed table 7 and presser foot 5 are rotated. It is designed to be lifted against the action of the ammunition device. Even after being lifted onto the throat plate in this way, the upper feed dog 2
is fitted into the through hole 3 of the presser foot 1, and in this state, even if the lifting device (not shown) is released, the presser foot 1 will be caught by the upper feed dog 2. It cannot be avoided horizontally by itself. Therefore, as shown in FIG. 2, one end is fixed to the side surface of the presser foot with a screw 19, and a pull-out lever 20 is fixed to the plate spring 21 with a screw 22 to protrude upward. Press the piece 23 with the presser stand 5
A hook member 24 is provided which is fitted into a slot 25 formed in the presser foot, and a protrusion 23 (see FIG. 3) which normally protrudes above the presser foot arm 17 is retracted by the pull-out operation of the pull-out lever 20. and presser foot arm 1
7 can rise without engaging the protruding piece 23. Even if the pull-out lever 20 is pulled out, the protruding piece 23 is moved backward, the foot pedal is depressed, and the feed table arm 16 and the presser foot arm 17 are pivoted upward, only the feed table arm 16 is moved. The presser foot 1 remains stationary simply by engaging the roller 27 at its tip with the feed base 7 and lifting the upper feed dog. For this reason, the upper feed dog comes to be located on the presser foot, and when the above-mentioned lifting lever is raised and the action of the bullet device is released, it becomes possible to avoid the presser foot 1 to the side.

In the normal state in which the pull-out lever 20 is not inserted and the protruding piece 23 protrudes as shown in FIG. 3, the presser foot 5 is also lifted up via the protruding piece 23 by the upward pivoting of the presser arm 17.

Furthermore, when the presser foot 1 and the upper feed dog 2 are raised and the pull-out lever 20 is operated to move the protrusion 23 backward, the presser foot 5 is disengaged from the protrusion 23 and descends. In this case as well, it is possible to avoid the presser foot 1 to the side. In addition, 29 in the figure
is a hook-shaped stopper formed on the leaf spring 21 that protrudes through a small hole 30 formed in the presser foot 5, and prevents the leaf spring from being bent by operating the pull-out lever until the stopper 29 engages with the side surface of the presser foot. It is possible to regulate it.

FIG. 4 shows another example of a stopper for regulating the amount of bending of a leaf spring, in which the base is fixed to the presser base together with the leaf spring 33 by screws 34 on the outside of the leaf spring 33 from which the pull-out lever 32 is formed protrudingly. A stopper 36 in the shape of a leaf spring is provided, and the stopper is bent so as to have an appropriate distance from the head of a screw 35 that fixes a hook member (not shown). The range is limited to the point where it engages with the stopper.

The presser foot mechanism of the present invention is constructed as described above, and can avoid the presser foot laterally even in the type of overlock sewing machine in which the upper feed dog is positioned and fitted into the through hole of the presser foot. Therefore, it is possible to thread the needle and remove the needle plate without difficulty.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of an overlock sewing machine equipped with a presser foot mechanism according to the present invention, Fig. 2 is an exploded perspective view of the main parts of the presser foot mechanism, Fig. 3 is a sectional view, and Fig. 4 shows another stopper. It is a principal part perspective view of the presser mechanism provided. 1...Presser foot, 2...Upper feed dog, 3...Through hole,
5...Press base, 6...Mounting base, 7...Feed base, 1
0... Throat plate, 15... Operating shaft, 16... Arm for feed stand, 17... Arm for presser foot, 20... Pull-out lever, 21... Leaf spring, 23... Protruding piece, 24
...Hook member, 29...Stopper.

Claims (1)

[Claims for Utility Model Registration] (1) A presser foot whose base is rotatably supported vertically and horizontally and supported by a presser foot that is always urged downward by an elastic device; An upper feed dog that is supported by an upper feed table that moves up and down and back and forth in conjunction with the main shaft, and that is arranged and fitted in a through hole provided in the presser foot to feed the cloth in cooperation with the lower feed dog. , an overlock sewing machine having a mechanism for lifting the upper feed table and raising the upper feed dog above the throat plate in conjunction with the operation of the operating member; an operating shaft that rotates in conjunction with the operating member; A presser foot arm fixed to the operating shaft,
When the knob is operated, there is an engagement position that is interposed between the presser foot arm and the presser foot and transmits the movement of the presser foot arm to the presser foot, and an engagement position that is retracted from this position and the presser foot arm and the presser foot are engaged. It has a presser foot lifting mechanism consisting of a protrusion that is switched to a disengaged position separated from between the upper feed dog and the presser foot, and when the protrusion is in the engaged position, the upper feed dog and the presser foot are moved by operating the operating member. are raised and lowered simultaneously, and when the protruding piece is switched to a non-engaging position by operating the knob, the upper feed dog is raised by operating the operating member and positioned above the presser foot. (2) The protruding piece protrudes laterally from the presser foot and engages with the upper surface of the presser arm.
Overlock sewing machine as described in section. (3) The overlock sewing machine according to claim 1, wherein the knob is formed protrudingly from a leaf spring whose base is attached to the presser foot. (4) The leaf spring is formed with a hook-shaped stopper that protrudes through a small hole in the presser foot, and the bending of the leaf spring is restricted to a range until the stopper engages with the presser foot.Claim 3 of the registered claim. Overlock sewing machine as described. (5) The overlock sewing machine according to claim 3, wherein a stopper is provided on the outside of the leaf spring to restrict bending of the leaf spring beyond a certain amount.