US 4,478,163 A · Dual exposure hot wire cutter

Abstract

A cutting assembly allows efficient automatic cutting of synthetic thread, and also allows manual cutting thereof. A guide block has a bottom surface past which cloth is adapted to move in a direction A, and a narrow channel is formed in the block substantially parallel to the direction A. A vacuum cut-thread removal passageway is formed in the block at the channel leading end and in operative communication with the channel, the passageway being elongated in a dimension intersecting the channel. A notch is formed in the block adjacent, but spaced from, the channel leading end and vacuum passageway. A wire of electrically conductive material is mounted so that it extends through the notch and channel and cuts thread moved into contact with it. An integral block having particular passageways formed therein provides a venturi arrangement adjacent the vacuum passageway to provide the vacuum source.

Claims12

Dependent claims

A cutting assembly for cutting thread, comprising:

a guide block having a bottom surface for movement of cloth therepast in a direction A;
means defining a narrow channel in said guide block substantially parallel to said direction A, said channel being open at said bottom surface, and having a trailing end and a leading end spaced from each other in the direction A;
means defining a vacuum cut-thread removal passageway in said block at said channel leading end, and in operative communication with said channel, said passageway elongated in a dimension intersecting said channel;
a wire portion of electrically conductive material adapted to be connected to a source of e.m.f.;
and
means for mounting said wire portion in said channel, spaced from the channel top, so that said wire extends in said channel generally perpendicular to said direction A adjacent, but spaced from, the intersection of said channel and said vacuum passageway, out of the primary flow of air into the vacuum passageway.

3 more elements

A cutting assembly for cutting thread comprising:

a guide block having a bottom surface for movement of cloth therepast in a direction A;
means defining a narrow channel in said guide block substantially parallel to said direction A, said channel being open at said bottom surface, and having a trailing end and a leading end spaced from each other in the direction A;
means defining a vacuum cut-thread removal passageway in said block at said channel leading end, and in operative communication with said channel, said passageway elongated in a dimension intersecting said channel;
means defining a notch in said block adjacent, but spaced from, said channel leading end and said vacuum passageway, said notch including an open bottom and end;
a wire of electrically conductive material adapted to be connected to a source of e.m.f.;
and
means for mounting said wire in said notch and said channel so that thread in said notch or said channel can be brought into contact with said wire, and severed thereby.

4 more elements

Dependencies are inferred from the claim text.

Dual exposure hot wire cutter

Life of this patent

Dual exposure hot wire cutter

Life of this patent

Abstract

Claims12