Feeding device for a hemstitching machine

Details Feeding device for a hemstitching machine Feeding device for a hemstitching machine

2001-09-05

2002-09-17

Izaguirre, Ismael (Department: 3765)

Sewing

Stitch forming

Chain or double chain

C112S302000

Reexamination Certificate

active

06450109

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a feeding device, and more particularly to a feeding device for a hemstitching machine.
2. Description of Related Art
With reference to
FIGS. 6 and 7
, a conventional feeding device (
61
) for a hemstitching machine (
60
) in accordance with the prior art is mounted on an underside of the hemstitching machine (
60
). The hemstitching machine (
60
) includes a needle (
62
), a feeding plate (
63
) and the feeding device (
61
). The needle (
62
) is mounted above the feeding device (
61
). The feeding plate (
63
) is mounted on top of the feeding device (
61
). The feeding device (
61
) comprises a plate-like base (
65
), and a sliding shuttle (
68
). The plate-like base (
65
) has a &Lgr;-shaped feeding hole (
66
) defined in one end and a guiding rail (
67
) longitudinally formed on the other end of the base (
65
). The guiding rail (
67
) points toward the apex of the feeding hole (
66
). The sliding shuttle (
68
) is slidably mounted on the guiding rail (
67
). A lip (
680
) extends from the sliding shuttle (
68
). A pivoting tab (
70
) is pivotally attached to the lip (
680
). A torsion spring (
69
) is mounted between the lip (
680
) and the pivoting tab (
70
). The torsion spring (
69
) has a first end abutting the lip (
680
) and a second end abutting the pivoting tab (
70
). When the sliding shuttle (
68
) moves near the feeding hole (
66
), the free end of the pivoting tab (
70
) moves into the feeding hole (
66
) and always maintains contact with the guiding rail (
67
) because of the force applied by the torsion spring (
69
).
To operate the conventional feeding device for a hemstitching machine, the sliding shuttle (
68
) is moved away from the feeding hole (
66
) along the guiding rail (
67
), and the pivoting tab (
70
) twists the torsion spring (
69
). Then the thread (
50
) is pulled from the hemstitching machine by the free end of the pivoting tab (
70
). The thread (
50
) is pushed into the feeding hole (
60
) when the sliding shuttle (
68
) moves toward the feeding hole (
66
), and the free end of the pivoting tab (
70
) is pressed into the feeding hole (
66
) due to the restitution force of the torsion spring (
69
). Then the thread (
50
) extends through the feeding hole (
66
) from opposite sides of the feeding hole (
66
) and is ready for use.
The conventional feed device for a hemstitching machine can feed the thread to the hemstitching machine. However, it also has the following disadvantages.
1. The structure of the conventional feeding device for a hemstitching machine is complex because the lip (
680
), the pivoting tab (
70
) and the torsion spring (
69
) are necessary for pushing the thread (
50
) into the feeding hole (
66
).
2. To start the hemstitching machine, the user must hold the free end of the thread (
50
) with one hand to prevent the thread (
50
) from moving back through the feeding plate (
63
), and push the sliding shuttle (
68
) toward the feeding hole (
66
) with the other hand to pick up the thread (
50
) for the first stitch. Consequently, the conventional feeding device is inconvenient to operate.
The present invention has arisen to mitigate and/or obviate the disadvantages of the conventional feeding device for a hemstitching machine.
SUMMARY OF THE INVENTION
The main objective of the present invention is to provide an improved feeding device for a hemstitching machine, which is convenient to use and has a simplified structure.
To achieve the objective, the feeding device for a hemstitching machine in accordance with the present invention includes a base having a feeding end with a protrusion extending from the feeding end and being inclined relative to the plane of the base. A slot is longitudinally defined in the base opposite to the feeding end. A sliding shuttle is slidably mounted on the base and has a groove defined to correspond to the protrusion of the base. The sliding shuttle includes two opposite sides each having a positioning plate attached to the sliding shuttle. A rotating shuttle is rotatably mounted on the base and includes a U-shaped pivot seat pivotally connected to the base. A torsion spring is mounted in the pivot seat and secured between the pivot seat and the base. A drive arm extends from the pivot seat, and a handle extends from the bottom of the pivot seat.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.


REFERENCES:
patent: 4977842 (1990-12-01), Fukao et al.
patent: 5076181 (1991-12-01), Wang
patent: 5347941 (1994-09-01), Mizuno
patent: 5704302 (1998-01-01), Tseng

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