US 5,085,157 AGranted

Sewing machine with an adjustable cutting device

AssigneeDurk Opp Adler Aktiengesellschaft

InventorsDetlef Jung, Gerhard Riss, Heinz Niehaus

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Abstract

A knife which is moveable vertically by a mover cooperates during the cutting process with a cutting plate which is mounted in a throat plate. A cutting edge of the knife is aligned parallel to an upper edge of the cutting plate so that these two cutting bodies momentarily contact each other over the full surface. In order to achieve a predetermined depth of penetration of the cutting edge into the cutting plate, which is made of visco-elastic plastic, the knife is first brought into an upper position by the mover. Then it is adjusted by a displacement member mounted in the mover. Its vertical position with respect to the cutting plate is displaced by a desired amount, while maintaining the parallel relationship of the cutting edge and the upper edge, regardless of their instantaneous position.

Claims14

Dependent claims

An adjustable cutting device in a sewing machine, comprising

a mover fastened to a frame of the sewing machine;
a rod depending from the mover and mounted so as to be moveable in a vertical direction by the mover;
a block connected at a lower portion of said rod, a moveable cutting member being fastened to the block, the moveable cutting member cooperating for cutting with a second cutting member on the frame;
the block being secured by guide means against rotation with respect to the frame the block being connected to the rod;
and by loosening the connection, the rod being moveable rotationally in response to rotation of a displacement member in the mover;
and
means for converting the rotational movement of the rod into movement of the block axially of the rod, whereby the rotation of the rod moves the movable cutting member vertically with respect to the second cutting member without changing a relative angle defined between them.

4 more elements

Dependencies are inferred from the claim text.