Method and device for sewing machine
First Claim
1. A sewing machine, comprising:
- a needle fitted with an upper thread,a drive element which drives the needle to perform an upward and downward movement to guide the upper thread through a sewing material which is fed between the upper thread and the under thread, so that the upper thread forms a loop below the sewing material,a shuttle which houses an under spool for the under thread,a gripper arm on the shuttle which hooks into the loop on the upper thread and guides the upper thread around the under spool so that a stitch is produced on the sewing material, anda take-up lever which at each stitch draws a knot which is formed in the sewing material by the upper thread and under thread in cooperation,a memory for storing stitch data for a sewing pattern,a thread feeder to feed upper thread to the needle,a control unit which from the data calculates the necessary thread consumption per stitch and thus controls the thread feeder,a function where the control unit in collaboration with the thread feeder adjusts the advanced thread quantity in relation to the theoretically calculated thread consumption,a mechanism for dyeing the upper thread where a color change for the thread dyeing is controlled by the control unit to be performed at a time when the calculated thread consumption in the quantity of stitches which according to the sewing pattern is present between the sewing material and the next color change in the sewing pattern, is equal to the length which corresponds to the length of the actual upper thread remaining between the sewing material and a dyeing point in the dyeing mechanism.
1 Assignment
0 Petitions
Accused Products
Abstract
A sewing machine for stitching thread with several colors according to a sewing pattern stored in the form of stitch data in a memory, where the thread is dyed by a mechanism for dyeing the thread and where the upper thread is fed to a needle by a thread feeder. The thread consumption per stitch is calculated by a control unit from the data. The thread feeder is controlled by the control unit so that for each step it advances the calculated thread consumption for the stitch. A thread consumption for the quantity of stitches which according to the sewing pattern remains between the sewing material and the next color change for the upper thread in the sewing pattern is calculated by the control unit, whereupon the dyeing mechanism is controlled by the control unit to initiate the dyeing of the upper thread with the next color at a time when the calculated thread consumption is equal to the length corresponding to the length of the actual upper thread remaining between the sewing material and the dyeing point in the dyeing mechanism.
-
Citations
18 Claims
-
1. A sewing machine, comprising:
-
a needle fitted with an upper thread, a drive element which drives the needle to perform an upward and downward movement to guide the upper thread through a sewing material which is fed between the upper thread and the under thread, so that the upper thread forms a loop below the sewing material, a shuttle which houses an under spool for the under thread, a gripper arm on the shuttle which hooks into the loop on the upper thread and guides the upper thread around the under spool so that a stitch is produced on the sewing material, and a take-up lever which at each stitch draws a knot which is formed in the sewing material by the upper thread and under thread in cooperation, a memory for storing stitch data for a sewing pattern, a thread feeder to feed upper thread to the needle, a control unit which from the data calculates the necessary thread consumption per stitch and thus controls the thread feeder, a function where the control unit in collaboration with the thread feeder adjusts the advanced thread quantity in relation to the theoretically calculated thread consumption, a mechanism for dyeing the upper thread where a color change for the thread dyeing is controlled by the control unit to be performed at a time when the calculated thread consumption in the quantity of stitches which according to the sewing pattern is present between the sewing material and the next color change in the sewing pattern, is equal to the length which corresponds to the length of the actual upper thread remaining between the sewing material and a dyeing point in the dyeing mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for dyeing upper thread with a sewing machine which comprises:
-
a needle fitted with an upper thread, a drive element which drives the needle to perform an upward and downward movement to guide the upper thread through a sewing material which is fed between the upper thread and the under thread, so that the upper thread forms a loop below the sewing material, a shuttle which houses an under spool for the under thread, a gripper arm on the shuttle which hooks into the loop on the upper thread and guides the upper thread around the under spool so that a stitch is produced on the sewing material, and a take-up lever which at each stitch draws a knot which is formed in the sewing material by the upper thread and under thread in cooperation, a memory for storing stitch data for a sewing pattern, and a mechanism for dyeing the upper thread, the method comprising; feeding the upper thread to the needle with a thread feeder, calculating a necessary thread consumption per stitch with a control unit from said data, the thread feeder is controlled by the control unit so that for each stitch it advances the calculated thread consumption for the stitch, a thread consumption for the quantity of stitches which according to the sewing pattern remains between the sewing material and the next color change for the upper thread in the sewing pattern is calculated by the control unit, the advanced thread quantity in relation to the theoretically calculated thread consumption is adjusted by the control unit in collaboration with the thread feeder, the dyeing mechanism is controlled by the control unit to initiate a dyeing of the upper thread with the next color at a time when the calculated thread consumption is equal to length corresponding to the length of the actual upper thread remaining between the sewing material and the dyeing point in the dyeing mechanism. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
Specification