JPS6226062Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to sewing machines, and in particular to a sewing machine that operates in conjunction with the sewing machine mechanism to perform four movements in the vertical and horizontal directions, and works in conjunction with a presser foot to press cloth. This relates to cloth feeding teeth that feed intermittently.

(Prior Art) The cloth feed teeth of a conventional sewing machine, as shown in the partial view of Figure 4, are configured to form inclined surfaces 4a on vertical surfaces 3a that are equally spaced apart and perpendicular to the cloth feed direction over the entire length in the cloth feed direction, and have upper ends made up of parallel ridges 5a that are equally spaced apart and formed by the intersections of the vertical surfaces 3a and the inclined surfaces 4a.

For this reason, when sewing a resilient and thick sewing product such as a carpet woven with thick thread using the cloth feed dog configured as described above, the spacing between the cloth feed dogs is small and the upper edge is Because of the ridgeline, the upper end of the cloth feed dog does not bite firmly into the carpet, and because the carpet is heavy, the cloth feed dog slips against the bottom surface of the carpet, making it impossible to feed the carpet by the specified amount, resulting in uneven stitch pitch. There was a drawback.

[Structure of the idea]

In this design, the feed dog on the front side in the cloth feeding direction has a ridge line consisting of a vertical surface and an inclined surface, the tip of the feed dog on the front side in the cloth feeding direction is made to have a sharp tip, and the interval between the feed teeth is set to be smaller than that of the feed dog on the front side. The purpose is to eliminate the above-mentioned drawbacks of the conventional method by providing a rough structure.

(Example) Reference numeral 1 denotes a feed dog body, which forms three cloth feed teeth 2a, 2b, and 2c that are parallel to each other along the cloth feed direction. Approximately 3 points in front of these cloth feed teeth in the cloth feed direction
The 1/4th part (right side) forms a ridgeline 5 consisting of the intersection of a vertical plane 3 perpendicular to the cloth feeding direction and a slope 4 whose tip is highly inclined with respect to the cloth feeding direction, and also forms a ridgeline 5 between the teeth. A flat portion 6 is formed in between, and the interval between these ridge lines 5 is approximately 2 mm to 3 mm. In addition, approximately two-thirds of the front part (left side) of each cloth feed tooth in the cloth feed direction is located on a vertical surface 7 perpendicular to the cloth feed direction.
On the other hand, there is a slope 8 which is highly inclined toward the front in the cloth feeding direction, and each cloth feeding tooth 2a, 2 as shown in FIG.
Form slopes 9a, 9b, and 9c that slope from the left and right sides of b and 2c toward the upper center edge, and have a slope of 0.1 mm to 1 mm at the tip.
A sharp part with ridge lines 10a, 10b, 10c of about mm is formed, and a flat part 11 is formed between these teeth, and the interval between these ridge lines is larger than the interval between the cloth feeding teeth on this side in the cloth feeding direction. Roughly 5mm to 6mm.

(Effect of the invention) As described above, this invention allows the cloth feed dog to move in four directions in conjunction with the sewing machine mechanism and feed the carpet etc. in cooperation with the cloth presser. The sharp edge bites into the carpet, increasing the fabric feeding force, ensuring that the carpet is fed by a predetermined amount, and creating stitches with a constant stitch length, resulting in sewn products with stable quality and high commercial value. In addition, the feed dog on the front side in the cloth feeding direction does not have a sharp point, and the frictional resistance between the feed dog and the carpet in these areas is small. While sewing the carpet, it is easy for the operator to manipulate the carpet from side to side so that the seams are formed along the corners and curved portions, which makes it possible to easily and reliably sew the corners and curved portions. be.

[Brief explanation of drawings]

Fig. 1 is a plan view, Fig. 2 is a side view from below Fig. 1, Fig. 3 is a side view from the left side of Fig. 1, and Fig. 4 is a partial perspective view showing a conventional feed dog. be. 1... Feed dog body, 2a, 2b, 2c... Cloth feed dog, 3... Vertical surface, 4... Slope, 5... Ridge line, 7
...Vertical plane, 8...Slope, 9a, 9b, 9e...
Slope, 10, 10b, 10c...ridge line.

Claims (1)

[Claim for Utility Model Registration] The sewing machine is linked to the sewing machine mechanism and performs four movements in the vertical and horizontal directions, and has a cloth feed tooth that intermittently feeds the cloth in cooperation with the presser foot, and A cloth feed for a sewing machine, characterized in that the feed dog has a ridge line consisting of a vertical surface and a slope, the feed dog at the front in the cloth feed direction has a sharp upper end shape, and the spacing is coarser than that of the feed dog on the near side. teeth.