Method and sewing system for the production of a pocket insert
AssigneeDurkopp Adler Aktiengesellschaft
InventorsHeinz Goldbeck, Dietrich Kahler, Thorsten Vogt
Life of this patent
Estimating the term…
Abstract
A method and sewing apparatus including a twin-needle sewing machine (3) for making a pocket insert having a flap. The workpiece (47) is placed in a preparation station (50) and gripped by clamping plates (41, 42), then transported into a sewing position (51), and thereafter into a cutting position (52). Before the seams are made, measurement variables which provide information with respect to the angles formed by the flap-limiting edges are fed to a control (23). As a function of the measurement variables, a control (23) automatically sets the angles of the corner knives (69, 70) provided at the cutting position (51).
Claims20
A method for the production of a pocket insert with the use of a sewing system, comprising the following steps:
- positioning an intermediate sewing-material part on a first sewing-material part in a preparation station, and positioning a second sewing-material part on the intermediate sewing-material part;
- transporting the sewing-material parts jointly into a sewing position and sewing them together with seams which extend parallel to a first axis (A), the seams having limiting points (G,H;
- I,K), and the second sewing-material part having edges extending at angles (W1;
- W2) to the first axis (A),
- making a longitudinal cut extending between the seams in the first sewing-material part and in the intermediate sewing-material part;
- transporting the sewing-material parts into a cutting position in which corner cuts with variable angular positions are carried out in the first sewing-material part and in the intermediate sewing-material part, the corner cuts having end points (P,Q;
- R,S);
- before making the corner cuts, detecting at least one of the edges of the second sewing-material part with a sensor device which is connected with a control unit;
- after detection of the at least one edge, providing an angle measurement signal representative of a measurement value from the sensor device to the control unit, and calculating at least one angle in response to said at least one edge of the second sewing-material part on the basis of said angle measurement signal;
- providing a setting member for the corner knife with a control signal from the control unit corresponding to the at least one detected edge of the second sewing-material part;
- and
- turning the corner knife in response to the control signal until the end points (P, Q;
- R, S) of the corner cut define a line extending parallel to a line defined by the limiting points (G,I;
- H,K) of the seams.
A sewing system for the production of a pocket insert, comprising:
- a twin-needle sewing machine with a drive for producing seams extending parallel to a first axis (A) in a first sewing-material part, an intermediate sewing-material part positioned thereon, and a second sewing-material part which is positioned on said intermediate sewing-material part and which has a first edge and a second edge, each extending at a respective angle (W1, W2) to said first axis (A);
- a transport device with a drive for transporting the sewing-material parts;
- a knife for producing a longitudinal cut at least in the first sewing-material part and between the seams;
- a cutting device, including a drive and corner knives, for producing corner cuts at least in the first sewing-material part, said corner cuts being provided with arms having end points (P, O, R, S), and
- a control for controlling the drives of the twin-needle sewing machine, the transport device, and the cutting device, and for providing the corner knives with variable angle positions for the production of the corner cuts;
- a sensor device disposed for detecting at least one of the edges of the second sewing-material part and for sending a sensor signal representative of a measurement value to the control;
- said control having a control part for converting said sensor signal into an angle measurement signal representative of said variable angle positions.
Dependencies are inferred from the claim text.