Method of operating a sewing machine, especially a multi-needle sewing machine, and an arrangement for performing the method
First Claim
1. A method of operating a sewing machine, especially a multi-needle sewing machine, in which the material to be sewn is advanced in any desired direction in a sewing plane delimited by a support, the respective needle is mounted on a needle holding arrangement and in operation moves with the thread substantially normal to the sewing plane through the material to a region situated beyond the latter, being deviated from its initial course by the action of the material thereon as the latter advances during the sewing stroke, and a gripper associated with the needle is mounted on a gripper holding arrangement for angular displacement along a displacement plane substantially normal to the sewing plane into and out of the region to engage the thread thereat, at least one of the holding means being mounted on the support for movement relative thereto along the sewing plane, comprising the steps of moving the one holding means along the sewing plane, and so controlling the movement of the one holding means during the moving step and while the needle performs its sewing stroke in dependence on the needle deviation that the distance between the needle and the displacement plane of the gripper remains substantially constant in the course of the sewing stroke.
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Accused Products
Abstract
A sewing machine, particularly a multi-needle sewing machine, includes at least one sewing arrangement which includes a reciprocating needle mounted on a needle holding arrangement and a gripper mounted on a gripper holding arrangement for angular displacement along a displacement plane and operative for engaging a thread delivered by the needle through the material being sewn to a predetermined region beyond the material. As the material is advanced, especially transversely of the displacement plane, during the sewing stroke of the needle, it acts on the needle and deviates the same from its initial course. To avoid malfunctions, at least one of the holding arrangements is mounted on the support for movement at least transversely of the displacement plane and parallel to the sewing plane of the material, and such one holding means is displaced by an appropriate moving arrangement in dependence on the extent of the deviation of the needle in such a manner that the distance between the needle and the displacement plane of the gripper is maintained substantially constant during the sewing stroke of the needle.
29 Citations
14 Claims
- 1. A method of operating a sewing machine, especially a multi-needle sewing machine, in which the material to be sewn is advanced in any desired direction in a sewing plane delimited by a support, the respective needle is mounted on a needle holding arrangement and in operation moves with the thread substantially normal to the sewing plane through the material to a region situated beyond the latter, being deviated from its initial course by the action of the material thereon as the latter advances during the sewing stroke, and a gripper associated with the needle is mounted on a gripper holding arrangement for angular displacement along a displacement plane substantially normal to the sewing plane into and out of the region to engage the thread thereat, at least one of the holding means being mounted on the support for movement relative thereto along the sewing plane, comprising the steps of moving the one holding means along the sewing plane, and so controlling the movement of the one holding means during the moving step and while the needle performs its sewing stroke in dependence on the needle deviation that the distance between the needle and the displacement plane of the gripper remains substantially constant in the course of the sewing stroke.
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6. A moving arrangement for use in a sewing machine, especially a multi-needle sewing machine, in which the material to be sewn is advanced in any desired direction in a sewing plane delimited by a support, the respective needle is mounted on a needle holding arrangement and in use moves with the thread substantially normal to the sewing plane through the material to a region situated beyond the latter, being deviated from its initial course by the action of the material thereon as the latter advances during the sewing stroke, and a gripper associated with the needle is mounted on a gripper holding arrangement for angular displacement along a displacement plane substantially normal to the sewing plane into and out of the region to engage the thread thereat, at least one of the holding arrangements being mounted on the support for movement relative thereto at least parallel to the sewing plane, comprising means for moving the one holding means along the sewing plane;
- and means for so controlling the operation of said moving means in dependence on the extent of the needle deviation as the needle performs its sewing stroke that the distance between the needle and the displacement plane of the gripper remains substantially constant in the course of the sewing stroke.
- View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
Specification