JPS608853Y2 - Improvement of vertical feed sewing machine - Google Patents

Description

[Detailed explanation of the idea] This invention relates to the improvement of a vertical feed sewing machine.

It is well known that in a vertical feed sewing machine, the sewing material is sandwiched between the bottom feed and the top feed.

In this sewing process, if the item to be sewn is a thin fabric, especially a thin fabric such as georgette, if an appropriate tension is applied to the front in the sewing direction and stretch stitching is performed, the stitching will be finished very well.

In conventional vertical feed sewing machines, the top feed is on top of the bottom feed, so even if there is a slight difference between the two feed amounts (the top feed is large), slippage between the fabric and the top feed will not occur. Therefore, a good stretching stitch effect could not be expected.

In the present invention, the above-mentioned problem is solved by operating the upper feed on the throat plate without disposing the upper feed on the lower feed.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figure 1 shows the vertical feed sewing machine of the present invention, where 1 indicates an arm;
2 is a bed, 3 is a needle bar, and a needle 4 is provided.

5 is a feed base, to which a lower feed 6 is fixed, 7 is a throat plate, 8 is a presser foot, and 9 is an appropriate drive means from an upper shaft (not shown).
This is an upward feed that operates on the throat plate 7.

FIG. 2 shows a conventional vertical feed arrangement.

(The same symbols are attached to parts with the same functions as those shown in the first diagram.

) That is, as can be seen from the figure, the upper feed 9 is the intermediate tooth 6a of the lower feed at the forward position of the needle hole 7a of the throat plate 7 in the feeding direction.
placed above.

Therefore, even if the tightening cloth pressed by the presser foot 8 is pinched and fed between the lower feed intermediate teeth 6a in front of the needle drop line 7a and the upper feed 9, which has a slightly larger feed amount than the lower feed 6, the upper feed A slight slip phenomenon occurs between the and the tightening cloth.

This prevented the desired stretch stitch effect.

In the present invention, as shown in FIG. 3, the intermediate tooth 6a of the lower feeder 6 opposite to the upper feeder 9 is eliminated.

Therefore, naturally, there is no feed dog slot in the front part of the needle hole 7a of the needle plate 7.

Therefore, during sewing, the upper feeder 9 sandwiches the knitted fabric between the needle plate surface and the needle plate surface in front of the needle drop 7a in the sewing direction.

Note that, as described above, the upper feed amount is larger than the lower feed amount by a predetermined amount.

With this, the upper feed 9 that contacts the top surface of the throat plate applies a slightly different pulling force in the feed direction to the part that is clamped between the lower feed 6 and the presser foot 8. Good stretch stitching without wrinkles etc. can be performed.

According to the present invention, the conventional inconveniences can be overcome with a simple structure, and it is useful for streamlining and improving the handling of work operations and the sewing effect.

[Brief explanation of drawings]

Figure 1 is a side view of the main parts of the vertical feed sewing machine of the present invention;
The figure is an explanatory diagram of the relevant main parts as seen in the prior art, and FIG. 3 is an explanatory diagram of the present invention. 1: Arm, 2: Bed, 4: Needle, 6: Down feed, 7: Throat plate, 8: Presser foot, 9: Up feed.

Claims (1)

[Scope of utility model registration request] The feed dog of the lower feed opposite to the upper feed is abolished, and the upper feed is operated independently of the lower feed in front of the needle hole center line on the upper surface of the throat plate in the feeding direction, and the feed amount of both the upper and lower feeds is reduced. Improvement of the vertical feed sewing machine with a difference in the vertical feed.