Unitary double-acting piston thread cutter assembly

Details Unitary double-acting piston thread cutter assembly Unitary double-acting piston thread cutter assembly

1999-09-24

2001-09-11

Izaguirre, Ismael (Department: 3765)

Sewing

Elements

Thread cutting, severing or breaking

Reexamination Certificate

active

06286445

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is directed to a sewing machine, and in particular, to a unitary double-acting piston chain thread cutter assembly for a sewing machine.
2. Description of Related Art
Sewing machines are used to produce a multitude of garments at a high speed of production. Chain threads between garments must be cut quickly, and preferably, without stopping the production of the next garment.
Chain thread cutter assemblies are widely used for cutting the chain thread formation between garments or pieces. By way of example, Clinton Industries manufactures a cutter assembly (model 3115FCA) that is permanently mounted via screws drilled into the top plate of the sewing machine. The cutter assembly comprises two separate sections: a driver section and a body section. To install the cutter assembly holes must first be drilled in the top plate of the sewing machine. Then the body section is secured to the top plate of the sewing machine behind the presser foot via screws. The driver section is placed behind the body section and slid together so that projection members extending from the driver section are received in complementary shaped apertures defined in the body section. A guard is positioned so that it extends over the top surface of both sections and secured via a screw to the driver section. Because of the separate components, assembly of the cutter assembly is time consuming and requires proper alignment of the two sections so that the guard fits over the top. Another disadvantage of this conventional device is that it is permanently affixed to the top plate of the sewing machine and thus can not be readily removed. The driver section includes a driving piston. During installation the driver section is arranged in the lateral direction so that the driving piston is substantially perpendicular to the direction of the cutter assembly. This is disadvantageous in that it is difficult to mount the assembly on space restricted overedge machines.
It is therefore desirable to provide a unitary chain thread cutter assembly that may be readily and releasably mounted to a wide variety of sewing machines.
SUMMARY OF THE INVENTION
An object of the present invention is to develop an integrated chain thread cutter and driver as a single unitary device thereby making the device more compact and reducing the time necessary for assembly.
Another object of the present invention is to provide a universal chain thread cutter that is releasably mountable to a wide variety of sewing machines. In accordance with the present invention the unitary double-acting thread cutter includes an integrated cutter section and drive section forming a single unitary device. The thread cutter assembly also includes a universal tension mount for releasably securing the thread cutter assembly to the top plate of a variety of different types and models of sewing machine. A V-shaped moveable blade has two sides with a pivot point defined at the intersection of the sides. Along one side of the moveable blade is disposed a cutting or knife edge. A double-acting piston and drive link are disposed longitudinally in the housing and connected so that they are both displaced at the same time. The drive link is also connected to the side of the moveable blade opposite that of the cutting or knife edge, so that movement of the piston and drive link in a longitudinal direction, in turn, causes the moveable blade to be displaced, whereby the cutting or knife edge of the moveable blade engages with that of a stationary blade and severs the thread chain.


REFERENCES:
patent: 3242892 (1966-03-01), Fowler
patent: 3250237 (1966-05-01), Myska
patent: 3430592 (1969-03-01), Florczak
patent: 3648634 (1972-03-01), Van Hazendonk
patent: 3696770 (1972-10-01), Dunne et al.
patent: 3815533 (1974-06-01), Bray
patent: 4202286 (1980-05-01), Freire Costas
patent: 4453481 (1984-06-01), Garnett et al.
patent: 5127350 (1992-07-01), Okada et al.
Clinton Service Guide Model 3115FCA for Flat Bed Machines (1994).

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