Cutting device for creating a slit opening for a buttonhole
AssigneeDurkopp Adler Aktiengesellschaft
InventorsBernd Pofalla, Christian Mollenkamp
Life of this patent
Estimating the term…
Abstract
A cutting device in a sewing machine for creating a slit opening for a buttonhole in a workpiece. First and second tool parts are spaced apart from each other in an open position and can be brought together in a closed position. One tool part has a block and the other tool part has a cutting edge. The block is formed in the shape of a strip, is accepted into a slit located on the sewing machine and is attached there with a clamping device. A slit opening can be created in a workpiece in a block-cutting mode by the cutting edge and the block. The cutting device can also be used for making a slit opening in a workpiece in a slit-cutting mode by removing the block and providing a different cutting edge, which can be performed in a simple manner.
Claims9
A cutting device for creating a slit opening for a buttonhole in a workpiece, comprising:
- first and second tool parts, which are movable apart from each other in an open position and adjacent to each other in a working position,
- the cutting device being operable alternatively in either a slit-cutting mode or a block-cutting mode, wherein:
- the second tool part has an elongated slit and the first tool part has a knife that, in the slit-cutting mode, is movable into the slit to create the slit opening, and
- in the block-cutting mode, a block is received in said elongated slit in said second tool part, the block having a working surface and the first tool part having a cutting edge that is movable to the working surface to create the slit opening,
- the block having the form of a strip and having a thickness corresponding to the width of said elongated slit and a length that corresponds at most to a lengthwise extension of the slit,
- an upper surface of the block having said thickness and said length, forms the working surface,
- the block is receivable in the slit with the working surface in alignment with an upper edge of the second tool part, and
- the block has a support surface on a lower side thereof opposite to the working surface.
Dependencies are inferred from the claim text.