JPS59168879A - Height control mechanism of feed table - 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 The present invention relates to a mechanism for adjusting the height of a feed table in a sewing machine equipped with a cylindrical bed.

On a sewing machine equipped with a cylindrical bed, such as a feed-out arm sewing machine, when performing down-stitching, depending on the shape (steps) of the seamed part of the sewing product, if only the general Because of the drawbacks that occur, a light row roller device for upper fabrics is used, but this device did not provide a fundamental solution.

To address this issue, a differential feed mechanism, throat plate shape, presser foot surface shape, etc. were used, but perfect sewing was difficult due to the precision of the parts involved, the type of fabric, etc., and adjustments were required each time.

Fig. 1 is a front cross-sectional view showing the height adjustment mechanism of the feed table in a conventionally proposed sewing machine equipped with a cylindrical vent.
(4) are formed, and rectangular bearings (5) and (6) are fitted into the long grooves (3) and (4), respectively. The eccentric cam portion (7a) of the eccentric bottle (7) is fitted into the hole of the square bearings (5) and (6). Eccentric bottle (7)
is rotatably fitted into the wall of the bed (8), and the screw (9)
If you stop it at , it will not rotate, but if you loosen the screw (9) and rotate the eccentric bottle (7) through the groove (not shown) in the head of the eccentric bottle, it will rotate through the square bearings (5) and (6). and the feed stand (
1) and (2) move up and down in the same direction at the same time to adjust the distance between the feed dog (not shown) and the throat plate.

However, with the conventional mechanism described above, the differential amount can be easily adjusted from the outside, and the adjustment of the respective heights of the left and right feed dogs cannot be easily corrected. Correct and beautiful sewing could not be done without this.

The present invention allows the height of the left and right feed dogs to be adjusted independently and at the same time, and eliminates the problems of the conventional drawbacks such as misaligned seams and bent seams.
The object of the present invention is to provide a mechanism for adjusting the cylindrical length of a feed base, which allows correct and beautiful sewing without sewing shrinkage.

In order to achieve the above object, the present invention includes a cylindrical bed and has two feed tables driven by a main shaft, the feed tables are held by a shaft fixed to the bed near the center, and each In a sewing machine having a structure in which vertical movement is given to each feed dog by an eccentric shaft via a square bearing, the eccentric shaft is a first shaft coaxially provided with an eccentric cam portion corresponding to each of the square bearings. and a second axis, the first axis and the second axis.
The first shaft is configured to be rotatable in forward and reverse directions, respectively.
When a screwdriver or the like is engaged with the groove in the head of the shaft and the second shaft and the shafts are rotated in any direction, forward or backward, each square bearing is rotated independently by the rotation of the eccentric cam of each shaft. The height of the feed dog can be adjusted independently via each feed stand.

Further, the present invention enables the first shaft and the second shaft to rotate in the forward and reverse directions within a limited range, and within the rotation range, the eccentric directions of both eccentric cam portions are made to match, and at this point, By allowing the first and second shafts to rotate forward at the same time, the eccentric cam portion simultaneously brings the feed bases to the same height via square bearings, allowing the heights of each feed dog to be adjusted simultaneously. Also, when the first or second shaft is reversed, only one shaft rotates, and the square bearing moves up and down via the eccentric cam part of the shaft, and the height of one feed dog is adjusted by the feed base. can be adjusted, and eventually the other shaft is rotated to adjust the height of the other feed dog, and eventually the height of each feed dog can be adjusted independently.

Since the present invention is constructed as described above, the height of the feed dog on both the left and right sides can be freely adjusted from outside the bed, and corrections such as seam unevenness, seam deviation, and seam shrinkage can be carried out extremely easily. Furthermore, since the height of the feed dog can be freely adjusted, the precision of parts related to height can be made looser than before, which reduces manufacturing costs such as assembly and processing.

Generally, when sewing with the upper fabric tip side roller device or the differential feed device, if the height of the feed dog is changed from side to side by an appropriate amount using the mechanism of the present invention in addition to this, the pressure during fabric feeding can be further adjusted. The feed with the higher feed dog starts feeding a little earlier than the other one, resulting in irregular stitching, and defects such as seam unevenness and misalignment can be easily and completely corrected.

Embodiments of the present invention will be explained below with reference to the drawings. FIGS. 2 to 5 show embodiments of the present invention, FIG. 2 is an exploded perspective view of the feed base and feed dog vicinity, and FIG. 3 is a feed shaft. FIG. 4 is an exploded perspective view of the feed mating shaft portion of an embodiment different from that in FIG. 2, and FIG.
FIG. 6 is an explanatory diagram showing the operating state of the eccentric cam in the illustrated embodiment.

First, in the first embodiment shown in FIGS. 1 and 2, (10)
(11) is driven by the main shaft of the sewing machine, and the feed dog (12+(
+31 to 45, a feed table that generates joint motion, and the feed table (10) αυ has a screw Q4) (14α) and Ua”A
(15α) Te said feeding tooth θ2) (13) is attached.

In addition, near the center of the feed table (10) (1υ) is a square bearing (
16) Long groove (10a) in which (17) can slide (I
c) and held on the bed α8), and a first shaft 11.c) fitted onto the first shaft a9). Eccentric cam portions (19α) and (20α) formed on each part of the second shaft (20)
However, the hole (16α) of the square bearing α6) (17) (
17a), and as shown in Figure 3, the feed bar +10)Ql
). Also, the first axis α9) and the second axis (20)
are screws (21) and (22) respectively.
is fixed to. (c) (24) are respectively the first axis α9)
and a second shaft (20) provided on the head end face of each of the second shafts (20) for rotating the respective shafts. A, (25) is the throat plate. The bed 01 is a cylindrical bed, and the feed table aO)0υ is held near the center by a shaft (not shown) fixed to the bed a8), and is connected to the feed dog via a square bearing (16) (1η). (12) This is a structure that gives vertical movement to (13).

Next, I will explain the effects. First, I and J (21) (22)
After loosening, engage a screwdriver or the like in the grooves (C) and (3) to rotate the first shaft α9) and the second shaft (20), and the eccentric cam portion (19α) on the shafts ( 20α), the square bearing (16) (1 gear) moves up and down, and the feed plate (10) (I
The height of f) can be adjusted individually.

Next, to explain the @2 embodiment in Fig. 4, (194
) and (20;), and a pin opening that fits into the notch (26) of the second shaft (26) is driven into the i-th #Ia6, and the pin (27) is inserted into the notch. ■The inside of ω can be rotated in the circumferential direction.

Next, the operation of the embodiment shown in FIG. 4 will be explained.

First, when a screwdriver or the like is engaged with the second shaft (26J groove (241) and the second shaft (20) is rotated clockwise,
The pin of the first axis LJ4 (2η is the left end of the notch (26)
26, the first shaft 119) also rotates together. In this case, as shown in Fig. 5 (a) and (b), the eccentric cam part rx
9c:) <2 or 4 eccentric directions are designed to match. Therefore, the feed table flO) (11) can simultaneously move the feed teeth up and down from the center A of the eccentric cam part.

Next, when the second shaft (20) is rotated counterclockwise, the rotation range of the notch (2G) is limited to the eccentric cam portion (20α5).
It rotates from position A, which is the center in the drawing direction, to position C, which is the center in the eccentric direction of the eccentric cam part (20α) of the second shaft (2o), and at the same time creates a difference in the vertical position of the feed table (10) (1υ). Therefore, the height of the feed dog (+3) is higher than that of the feed dog (+3).
12) can be adjusted low. In addition, B is an axis that does not rotate (1
9). Although grooves are not required on the end face of the first shaft (+6), they may be provided.The above example is a case where two bottles (two bottles) are installed on the first shaft (+9). Even if a notch groove is provided on the first shaft (09) and a pin that engages with the @me notch groove is implanted on the second shaft (20) so as to protrude toward the center hole, the same effect can be achieved. play.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view showing the engagement of the feed table and eccentric pin in a conventional sewing machine equipped with a cylindrical vent, and Fig. 2 is an exploded perspective view of the feed table height adjustment mechanism showing an embodiment of the present invention. , FIG. 3 is a front sectional view corresponding to FIG. 1 of the feeding shaft portion of FIG. 2, FIG. 4 is an exploded perspective view of the feeding shaft portion showing an embodiment different from that in FIG. 2, and FIG. Figures (A), (B), (C), and (B) are explanatory diagrams showing different operating states of the eccentric cam in the case of FIG. 4, respectively. Explanation of main parts of the figures 10, 11...Feed base 12.13...Feed teeth 16, 17...Square bearing 18...Bed 19α, 19a...Eccentric cam portion 20α, 20a... Eccentric cam parts 23, 24...Groove 26...Notch part 26a...Left end 27...Bin patent
Applicant Aisin Seiki Co., Ltd. Figure 3 Figure 5 (a) (c) (b) (d)

Claims (2)

[Claims] (1) It is equipped with a cylindrical bed and has two feed stands driven by a main shaft, and the feed stands are held by a shaft fixed to the bed near the center, and eccentrically connected through respective square bearings. In a sewing machine having a structure in which a shaft gives vertical movement to each feed dog, the eccentric shaft is constituted by a first shaft and a second shaft coaxially provided with eccentric cam portions corresponding to the square bearings, respectively. A height adjustment mechanism for a feed base, characterized in that the first shaft and the second shaft are rotatable in forward and reverse directions, respectively, so that the height of each feed dog can be adjusted independently. (2) It is equipped with a cylindrical bed and has two feed stands driven by a main shaft, and the feed stands are held by a shaft fixed to the bed near the center, and eccentrically connected through respective square bearings. In a sewing machine having a structure in which a shaft gives vertical movement to each feed dog, the eccentric shaft is constituted by a first shaft and a second shaft coaxially provided with eccentric cam portions corresponding to the square bearings, respectively. At the same time, the first shaft and the second shaft are made to be rotatable in forward and reverse directions within a limited range, and the eccentric directions of both eccentric cam parts are made to coincide within the range of rotation, and at this point The first shaft and the second shaft can be rotated in the normal direction at the same time, so that the height of each feed dog can be adjusted simultaneously, and at the same time, either the first shaft or the second shaft can be reversed. A height adjustment mechanism for a feed base, characterized in that the height of each feed dog can be adjusted independently.