Individual needle control tufting machine
A tufting machine and method for operating a tufting machine operating a needle selection mechanism based on pattern data by selecting a needle with yarn required for the pattern such that the selected needle is driven by a needle bar through the backing medium, to form a tuft while a needle that is not required for the pattern is not selected by the needle selection mechanism. Yarn is fed via a yarn feed mechanism comprising a plurality of actively driven yarn drives each driving a respective yarn to a respective needle, the yarn drives being at a location between a yarn creel and the needle. The method being characterised by operating the yarn feed mechanism to deliver at least 70% of the yarn required for a tuft as the needle moves from top dead center to bottom dead center.
1. A method for operating a tufting machine, the method comprising:
feeding a backing medium through a tufting region using backing rollers;
reciprocating a needle bar at the tufting region to drive needles into and out of the backing medium, the needle bar comprising at least one row of needles;
receiving loops of yarn on gauge parts on the opposite side of the backing medium;
controlling the operation of the tufting machine using a controller which receives pattern data for a carpet to be tufted;
operating a needle selection mechanism controlled by the controller based on the pattern data by selecting a needle or group of needles with yarn required for the pattern such that the selected needle or group of needles is driven by the needle bar through the backing medium to form a tuft or tufts while a needle or group of needles that is not required for the pattern is not selected by the needle selection mechanism and is not driven through the backing medium as the needle reciprocates; and
feeding yarn via a yarn feed mechanism comprising a plurality of actively driven yarn drives each driving a respective yarn to a respective needle, the yarn drives being at a location between a yarn creel and the needle;
wherein the yarn feed mechanism delivers at least 70% of the yarn required for a tuft as the needle moves from top dead center to bottom dead center.
2. The method according to claim 1 , further comprising operating the yarn feed mechanism to deliver at least 80% of the yarn required for a tuft as the needle moves from top dead center to bottom dead center.
3. The method according to claim 1 , wherein the yarn is fed from the yarn drive to the needle without passing through a latch.
4. The method according to claim 1 wherein the yarn is fed from the yarn drive to the needle without passing through a pair of puller rolls.
5. The method according to claim 1 , wherein the yarn is fed from the yarn drive to the needle without passing through any tension regulating or tension influencing components.
6. A tufting machine, the machine comprising;
backing rollers to feed a backing medium through a tufting region;
a needle bar on one side of the backing medium in the tufting region, the needle bar comprising at least one row of needles and being reciprocable at the tufting region to drive needles into and out of backing medium;
gauge parts on the opposite side of the backing medium to receive loops of yarn formed by the needles;
a controller which receives pattern data for a carpet to be tufted;
a needle selection mechanism controlled by the controller based on the pattern data such that a needle or group of needles with yarn required for the pattern is selected by the needle selection mechanism to be driven by the needle bar through the backing medium to form a tuft or tufts while a needle or group of needles that is not required for the pattern is not selected by the needle selection mechanism and is not driven through the backing medium as the needle bar reciprocates;
and a yarn feed mechanism comprising a plurality of actively driven yarn drives each yarn feed drive being configured to drive a respective yarn to a respective needle, the yarn drives being at a location, in use, between a yarn creel and the needle, wherein the yarn feed mechanism is configured to deliver at least 70% of the yarn required for the tuft as the needle moves from top dead center to bottom dead center.
7. The tufting machine according to claim 6 , wherein the yarn is arranged to be fed from the yarn drive to the needle without passing through a latch.
8. The tufting machine according to claim 6 , wherein the yarn is arranged to be fed from the yarn drive to the needle without passing through a pair of puller rolls.
9. The tufting machine according to claim 6 , wherein the yarn is arranged to be fed from the yarn drive to the needle without passing through any tension regulating or tension influencing components.
10. The tufting machine according to any of claim 6 , wherein the yarn feed mechanism is configured to deliver at least 80% of the yarn required for the tuft as the needle moves from top dead center to bottom dead center.
11. The tufting machine according to any of claim 6 , further comprising a yarn compensation device to take up slack upstream each yarn feed drive.
12. The tufting machine according to claim 11 , wherein the yarn compensation device comprises a weight for each yarn which pulls each yarn down to absorb slack.