Sewing – Special machines – Positionable work carrier
Patent
1998-11-19
2000-01-18
Izaguirre, Ismael
Sewing
Special machines
Positionable work carrier
112309, D05B 3900
Patent
active
060149388
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention generally relates to a hemming apparatus for fabric products. This invention more particularly relates to a hemming apparatus or hemstitching apparatus for single-fabric products such as towels, handkerchiefs, luncheon mats, pillow cases and scarves.
2. Prior Art
To produce single-fabric products, generally of rectangular configuration, such as towels, handkerchiefs, luncheon mats, pillow cases or scarves, an elongated fabric material is first cut into fabric pieces of appropriate dimensions, then their hems are sewn or lock seamed to prevent fraying. Japanese Laid-Open Patent Publication No. 4-26480 discloses a method for hemming fabrics as shown in the attached FIG. 53C, where the four corners of a fabric piece are locked squarely. Japanese Laid-Open Patent Publication No. 7-24169 discloses another method for hemstitching fabrics, where the four corners of a fabric piece are locked or sewn roundly.
Straight side portions (edges) of fabric pieces (fabrics) are sewn or lock seamed as the fabrics advance relative to a sewing device. The corner portions of fabrics are sewn or lock seamed as or after the corners turn 90 degrees relative to the sewing device for "round" or "square" corner treatments respectively. Such a square corner treatment is provided when a 90-degree turning of fabrics is made while the needle of the sewing device is idling. On the other hand, such a round corner treatment is provided when a 90-degree turning is made while the needle is functioning.
Japanese Laid-Open Patent Publication No. 4-189388 discloses a hemming apparatus for rectangular fabric products, which comprises, as shown in the attached FIG. 53A: table; direction of fabric feeding; the swing arm; and
The attached FIG. 53C-1 shows a square fabric piece generally defined by "C" which is fed close to the needle of the sewing device 2 shown in FIG. 53(A), "P" indicating where the needle contacts the fabric C.
The elevator device 10 lowers the fabric absorber device 9, whose absorbers 11 absorb the fabric C placed on the work table 1 after the rail driver 5 turns the threaded rail 4, sending the nut device 6 in the fabric feeding direction, and then the nut device 6 stops over the fabric C. The fabric C is advanced toward the needle point P (direction A) with the feeder teeth of the sewing device 2 (synchronized with the nut movement), and sewn along an edge (see FIG. 53C-2). Then the fabric C attached to the absorbers 11 is swung 90 degrees in the direction B around the needle point P by means of the swing arm 7 driven by the arm driver 8. Next, the nut device 6 is retreated on the threaded rail 4 by means of the rail driver 5 such that the fabric C is placed before the needle point P as shown in FIG. 53C-4. The foregoing sewing process is repeated in the direction D to treat another edge of the fabric C as the fabric C advances in the direction A shown in FIG. 53C-5. The remaining two edges of the fabric C are sewn or locked in the same manners. Practically all these steps are performed automatically.
The hemming apparatus described above provides the following advantages: a) reduction in manpower; and b) homogeneous quality of edge treatment as the feeding of fabrics is provided automatically.
However, this hemming apparatus is not without a shortcoming: before another sewing takes place so as to provide a gap between the needle point P and the fabrics, which generate "time loss"; and
Japanese Laid-Open Patent Publication No. 7-24169 discloses an edge locking or sewing apparatus, which automatically provides "round" corner seaming, comprising, as shown in FIG. 52: round; holder plate 30 toward the sewing device 2; corner pin 33 for a predetermined angle.
A fabric placed on the work table 20 is pressed and held by the holder plate 30, which is sent toward the sewing device 2 by means of the fabric feeder 60. The holder device 80 holds a corner pin 33 and the rotary device 90 turns or swings the holder plate 30 for a predetermined angle. The fabric is overlo
REFERENCES:
patent: 5018462 (1991-05-01), Brocklehurst
patent: 5400728 (1995-03-01), Zinssmeister
patent: 5647292 (1997-07-01), Morgulis et al.
patent: 5778811 (1998-07-01), Gill et al.
patent: 5809919 (1998-09-01), Mitchell et al.
Barudan Sewing Machine Co., LTD.
Izaguirre Ismael
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