JPS6045383A - 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] This invention provides a sewing machine equipped with an upper feed device that performs four movements, including forward and backward movement and up-and-down movement, with an upper feed device that performs lower feed and inter-feed in cooperation with teeth. .

Tokuen No. 52-86844 as a top feeding device for kunun,
Utility Publication No. p856-11772, Special Publication No. 57-26795
The immediate version indicated by the number is known. In this device, the upper feed mountain is rotatably supported in the vertical direction by a drive group that reciprocates in the feed direction. The vertical movement is caused by the crank that moves to the main shaft with the lower lever U of the upper feed rotation and jams vertically, that is, the crank II is pushed upward against the action of the spring, and the crank moves downward. When the sewing machine is stopped, the main shaft is in a state where it can rotate freely because it is lowered by the action of the above spring when the sewing machine is stopped, or because the above spring always acts to push down the upper feed arm. When the upper feed arm is lifted, the upper feed arm will descend until the upper feed dog reaches the cloth on the plate or the throat plate, and the crank will also be pushed down accordingly, causing the spindle to rotate downward. This becomes a problem when the crank is on its upward stroke when the machine is stopped. This is because the main shaft, which is connected to the crank via the transmission 4.'t, is rotated in the opposite direction, resulting in skipped stitches when the sewing machine is moved again to start sewing.

Figures 1A to 1F show the seam forming process of an edge stitch sewing machine using 3 threads. The sewing machine is stopped when the puller comes out of loop 4 of
Returns to the state shown in FIG. 1C in which the right luniper thread is scooped into the button 5 without scooping the loop 4 with the hand 1ju. In this state, unlike the one in the diagram, loop 4 is not hooked to the right looper, so when the sewing machine is driven again, skipped stitches may occur. The same problem occurs in sewing machines that normally sew the edges of the moon, and it occurs more noticeably in sewing machines where the upper feed dog or the needle drop position acts backward in the feed direction.

To eliminate the skipped stitch phenomenon, use a needle positioner.
It would be possible to use the attached drive motor so that the crank always stops at a fixed position, but using a motor like the one described above makes the sewing machine more local, which is not desirable.

An object of the present invention is to provide another simple means for preventing rotation of the main shaft immediately after the sewing machine is stopped, thereby preventing the above-mentioned skipped stitch phenomenon from occurring.

One means for achieving the above object is to use a sewing machine that is coupled to a crank or equipped with an upper feed device of the type proposed by the applicant Kasaki in Japanese Patent Application No. 57-216400 and Japanese Patent Application No. 57-225294. Of the various mechanisms of the sewing machine, including the upper and lower feed mechanisms, the upper needle mechanism, the knife mechanism, the looper mechanism, and the main shaft, which are linked to the drive side of the clutch, the upper feed arm is constructed as appropriate. A spring that acts in the opposite direction to the spring that presses down is provided, and the action of the former spring on the actuating member is canceled by the spring, so that rotation of the main shaft is not caused. In the latter known vertical movement mechanism in which the upper feed dog is raised and lowered by a spring, the crank is pressed against the upper feed arm, and in the above-mentioned type proposed by the applicant Kasaki, the jiK *b side of the clutch is pressed against the driven side. During one rotation, the main shaft rotates in a certain range against the action of the latter spring, and in other ranges it only rotates with the aid of the spring R4, which causes the upper feed arm to rotate. There is no problem in going up and down. That is, the main shaft rotates during one revolution against the action of the latter spring, which causes the crank to lower or one of the clutches to move.
When the driving side rotates in a direction in which it is pulled out from the driven side, the upper feed arm descends together with the crank due to the action of the former's spring, and also rotates in the direction in which the latter's spring acts, causing the crank to rise. Alternatively, when either the driving side or the driven side of the clutch is rotated in the direction f that allows it to move from →ψ, the upper feed arm of the former moves up against the action of the spring.

Another means for achieving the above object is to brake the appropriate operating members of the upper and lower feed mechanisms, upper needle mechanism, knife mechanism, looper mechanism, and other mechanisms provided in the sewing machine.

In one embodiment, the brake piece is spring-loaded against an eccentric cam fixed to the main shaft.

When the upper feed arm is lifted, it is pressed against an eccentric cam or brake piece.

In another embodiment, the upper feed arm may move in different paths when the upper feed bowl is raised and when it is lowered, e.g. by a rod connected to an eccentric cam or a lower feed table t. A brake piece is provided which engages to brake the rod or the lower feed table when the rod is in position.

If the embodiments of the present invention are explained below with reference to the drawings, the second problem is the upper feed device of the sewing machine of the type proposed by the applicant in %A 1977-216400, that is, one end is connected to the crank 12 of the front and rear feed shaft 11. An upper feed arm 16 having an upper feed dog 15 facing the lower feed m13 at its free end, an elastic device 17 that presses down the upper feed arm, and a vertical feed shaft 18.
The crank pin 20 is connected to the upper knife shaft 23 and the crank 22 is slidably assembled to the two prongs 21 attached to the upper knife 16. However, the mounting of the slider 26, which is slidably mounted on the swinging tray or the crankshaft 25, is adjusted by adjusting the position. The first one is loosely fitted into the il+18 so that it can only be rotated. a two-pronged lever 27, which is fixed to the vertical feeder 18, and a clutch piece that removably engages in the circumferential direction with the two-pronged clutch piece of the above-mentioned elastic mechanism 17, which has an effect of two prongs/<-27. It has a collar 28 with a main shaft (not shown) when the upper feed teeth 13 are lifted
When the upper knife 30 that follows rises and rotates downward (the two-pronged lever 27), the action of the bullet device 17 engages the clutch piece and the upper feed 1% 16 and crank 22.
F) After being pushed down and its descent stopped by the upper feed dog 13, the cloth on the steel plate, or the side plate, the two-pronged lever 27 further rotates to the bottom dead center, separating both clutch pieces. When the two-pronged lever 27 reaches the bottom dead center one point and reverses, both clutch pieces engage on the way up, and from then on, the crank 22 is raised against the action of the elastic device, and the upper feed dog is moved. This mainly refers to the vertical movement mechanism of the upper feed device of a sewing machine that is designed to lift.While the upper feed lever is being lifted, the action of the elastic device moves the upper feed through the engaged clutch pieces. Female shaft, main shaft, and other M
In order to prevent rotation due to this action, the two-pronged lever 27 has a mechanism that balances the rotational torque of the ammunition device 17, that is, in a direction opposite to that of the ammunition device. The coil spring 33 that acts and urges the two-pronged lever 27 to rotate upward connects the upper part 4 to the sewing machine frame.
The lower end is hooked to a port 34 at the rear of a two-pronged lever (see Figure 3) to prevent downward rotation due to the action of the bullet device when the sewing machine is stopped. can be,
This is done to prevent reverse rotation of the main shaft.

In the illustrated example, the two-pronged lever is equipped with a coil spring to counteract the action of the bullet device, or other mechanisms that interact with the two-pronged lever, such as the upper knife, the upper sword, or the main - etc. may be provided with a coil spring, torsion spring, plate spring, etc. to balance the effect caused by the ammunition device.

Figure 4 shows another embodiment for preventing reverse rotation of the main shaft when the sewing machine is stopped.A cam 42 is fixed to the main shaft 41, and the cam is raised by lifting the upper feed dog. When the spring is loaded, the brake piece 431 is pressed and braked to prevent rotation of the main shaft due to the action of the bullet arm.

Instead of installing the cam 42 on the main shaft, other rotating shafts or oscillating m#i
+ and brake ab in the same manner as above.
It is also possible to use a rod connected to an eccentric cam fixed to the rotating shaft, a lower feed table, etc., which move in different paths when the upper feed dog ascends and when it descends. , a brake piece may be provided that directly engages and brakes the upper feed dog when it is lifted.

According to the sewing machine of the present invention, the various mechanisms are prevented from moving due to the action of the elastic device that pushes down the upper feed arm when the sewing machine is stopped, and the reverse rotation of the main shaft is also prevented, which is different from the conventional sewing machine. Unlike sewing machines equipped with an upper feed device, A) there is no skipped stitch phenomenon that occurs at the beginning of stitching.

[Brief explanation of the drawing]

Figures IA-F are explanatory diagrams showing the seam formation process for edge stitching, Figure 2 is a perspective view of the vertical movement mechanism of the upper feed dog, Figure 3 is an elastic view of the main part of the mechanism, Figure 4 shows a sectional view of another embodiment. 15. Upper feed dog 16. Upper feed arm 17. Bullet device 18.
・Main axis 42 @ @ Cam 430 Brake piece Patent attorney Akira Sato - Procedural amendment - (spontaneous) May 7, 1930, Taku 1 Patent Office Commissioner Kazuo Wakasugi 1 Indication of case 1988 Patent Application No. 20515 2 Name of the invention
Sewing machine 4 Agent and drawing 8 Contents of the amendment As shown in the attached sheet / "Figure 4 is" in the 8th line of page 9 of the specification is corrected as follows. "Figure 4 shows a coil spring 35 attached to the upper knife shaft 23 of the upper knife mechanism.
5 shows an example in which a coil spring 37 is wound around the swing shaft 36 that swings in conjunction with the main shaft (not shown) of the upper needle mechanism, and FIG. The balance weights 381 and 381 each show an example in which one end of the compression spring 39 is locked to bias the swing shaft 36 in one rotation direction. Figure 7 is a j U page 10, lines 11-12, "Figure 4 shows..." is replaced with "Figures 4-6 are perspective views of different embodiments, and Figure 7 is a perspective view of yet another embodiment." A cross-sectional view of the embodiment is shown.'' 3. Figure 4 of the drawings has been corrected to Figure 7, and Figure 4 of the attached drawings has been corrected.
Add figures 5 and 6. Procedural amendment September 28, 1980 Manabu Shiga, Commissioner of the Patent Office 2 Name of the invention Sewing machine 3 Relationship to the case of the person making the amendment Patent applicant Manufacturer of Pegasus sewing machine, 5-7-2 Sagisu, Fukushima-ku, Osaka, 570 Representative of Co., Ltd. Mima Daido 5 Date of amendment order June 12, 1980 6 Target of amendment Drawings 4V85, 6 and 7 attached to procedural amendment submitted on May 7, 1988

Claims (1)

[Claims] (1) An upper feed arm that is pivotally supported by a member that reciprocates in the feed direction so as to be able to swing vertically, and has an upper feed dog at its free end that faces the lower feed dog; A vertical movement mechanism including an elastic device that presses down the feed arm, and a crank that swings vertically in conjunction with a main shaft on the underside of the top feed arm and engages with the top feed arm to move the arm up and down. In a sewing machine equipped with an upper feed device having
Rotation of the main shaft due to the action of the above-mentioned elastic device is applied to appropriate operating parts of the various mechanisms of the sewing machine, including the upper and lower feed mechanisms, upper needle mechanism, knife mechanism, looper mechanism, and other main shafts that are affected by the above-mentioned elastic device. A sewing machine characterized in that it is provided with a blocking means (2), wherein the means is a spring provided to act on the operating member in a direction opposite to that of the elastic device and cancel the action of the device. The sewing machine described in item 1 (8) The above means works when the upper feed arm is lifted.
The patented S which is a braking device that controls *J8 regulation of J gun
The sewing machine (4) according to Paragraph 1 of the invention, wherein the actuating member is a duck, a cam is mounted on the shaft, and the braking device is a brake piece that is loaded with a spring that is applied to the cam. Sewing machine described in paragraph 3