JPH03185126A - Unification of yarn count in ring spinning frame - Google Patents

Abstract

PURPOSE: To uniform the count of the subject yarn by controlling the number of revolutions of each of plural bottom rollers of a draft system, driving the rollers, correcting a draft condition by the change of fine spinning speed, supplying a fibrous material and altering the whole draft amount in a draft zone. CONSTITUTION: Plural bottom rollers 1-3 of a draft system are driven individually or in divided groups by driving systems 4 and 5. The number of revolutions of each roller is prestored as a control program in a circuit board and can be independently controlled by a control system 9 built in a computer 10. When a spinning speed is raised or dropped, a drafting condition is corrected and a larger amount or a smaller amount of a fibrous material is supplied. The whole draft amount is changed in one or a few draft zones to uniform the count of yarn in a ring fine spinning frame.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of driving a plurality of bottom rollers of a draft system individually or in groups using respective drive devices, so that the number of revolutions of each bottom roller becomes independent. The present invention relates to a method for making the yarn count uniform in a ring spinning machine, which can be adjusted by adjusting the yarn count.

[Prior art and the problem to be solved by the invention] By driving a plurality of draft system bottom rollers individually or in groups using respective drive devices, the rotation speed of each can be adjusted independently. The ring spinning machine is published in patent publication DB 2753924 of the Federal Republic of Germany.
It is disclosed in C2. In this device, each drive, independent of the ring spinning frame, uniformly changes the speed of all operating elements.

Today, in high-speed ring spinning machines, the spindle is 25.0
The target is a rotation speed of 0.00 revolutions per minute. It has also been found that as the spinning speed increases, the properties of the spun yarn change. The thread becomes thinner. On the other hand, when the spinning speed decreases, the yarn becomes coarser. This phenomenon occurs not only at the start of operation of the ring spinning frame, but also at the end of operation. The target speed requires several hours of continuous operation of the low-speed ring spinning machine traveler. and,
Although it has the disadvantage of sorting the spun yarn within such a long time, this is something that must be eliminated.

[Means, actions, and effects for solving the problem] According to claim (1) of the present invention, it is possible to spin 0 yarns uniformly during the entire spinning time. In the invention, as the spinning speed increases, fiber material is additionally supplied to the draft system in an amount corresponding to a preset ratio. It is known among those skilled in the art that by additionally increasing the speed of the draft bottom roller, the draft ratio in the next draft area is suppressed and thus more fiber material is fed into the yarn. . The opposite is also true regarding the decrease in spinning speed. if,
If a power outage occurs in the power supply, the yarn count will be equalized by the emergency power supply until the machine stops.

The invention is possible by providing a unit with the usual three pairs of draft rollers or, in the sliver process, a unit with five pairs of draft rollers.

Claim (2) indicates a preferred form of the main draft area. It is desirable to leave the easily affected break area as it is without changing the rotational speed of the feed bottom roller or apron bottom roller excessively. To simplify the method, both draft bottom rollers can be driven in common.

If the yarn count becomes finer under high spinning speeds, the resulting yarn length increases proportionately. Therefore, the twist of the yarn is reduced.

If the twist of the yarn is of great importance, this effect must be compensated for. This is claim (4)
The problem is solved by claim (5).

According to claim (6), it is possible to provide an actual machine with a control system having an execution program that determines a necessary speed change under certain conditions.

According to claim (7), all possible conditions can be adopted in the control program by evaluating the given spinning technology parameters, so that the range is further expanded.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, taking as an example a draft system having three pairs of rollers. Of the complete draft system, only the feed bottom roller 1, the apron bottom roller 2 and the delivery bottom roller 3 are shown. The feed bottom roller 1 and the apron bottom roller 2 are commonly driven by an electric motor 4, and the delivery bottom roller 3 is driven by an electric motor 5. The fiber material passes through the draft system in the order of the bottom roller. During its passage, a top roller (not shown) pushes the fibrous material against bottom rollers, each rotating at a different speed. By increasing the speed from one pair of rollers to the next, the fiber material is drafted and finally twisted by a ring/traveler (not shown) on its way to the spindle 6. An electric motor 8 drives a spindle 6 via a tangential belt 7.

Instead of the tangential belt 7 shown, the spindle can also be driven by a single electric motor, which is advantageous for high-speed spinning. On the other hand, the electric e18 can drive additional elements, such as the delivery bottom roller 3, for example.

Current to all drive motors is supplied via frequency converters, etc., and the motors are supplied with angle transmitters (an
gle transmitter) and a positioning processor (positioning processor).
cessor).

In order to obtain the desired count thickness, feed bottom roller 1 and apron bottom roller 2 are used for break drafting.
The rotational speed of the delivery bottom roller 3 increases, i.e. superproportionally, to a higher speed than the delivery bottom roller 3 if the spinning speed increases. The electric motor 4 receives control commands from a control system 9 built into a computer 10, with important parameters stored in advance on a circuit board as a special control program.

By increasing the rotational speed of the feed bottom roller 1 and the apron bottom roller 2 together, an excessive speed difference between the apron bottom roller 2 and the very fast delivery bottom roller 3 causes more fiber material to be transferred to the yarn. break draft is reliably maintained. Actually, 25,000
A compensation of about 6% is made for a spinning speed of 0 revolutions per minute.

In addition to the method described above, if the rotation of the bottom rollers of all draft systems becomes low proportionally when the spinning speed increases,
Higher twists can be added to the yarn when the rotational speed is increased proportionally or when the spindle speed is increased proportionately. This operation can be preset in the control system of the machine through a variable program using a computer or thread monitoring device.

[Brief explanation of drawings]

The accompanying drawing is a schematic configuration diagram of an apparatus according to an embodiment of the present invention.

Claims (8)

[Claims] (1) Yarn count in a ring spinning machine whose rotational speed can be adjusted independently by driving multiple bottom rollers of the draft system individually or in groups using each drive device. In the homogenization method, when the spinning speed is increased or decreased, the total draft volume is changed in one or several draft zones so that more or less fiber material is fed by modifying the draft conditions; A method for making yarn count uniform in a ring spinning machine, characterized by: (2) A claim in which, when the spinning speed increases or decreases, the rotation speeds of the feed bottom roller (1) and the apron bottom roller (2) are increased or decreased in excessive proportion to the delivery bottom roller (3). A method for making yarn count uniform in a ring spinning machine according to (1). (3) The method for making yarn count uniform in a ring spinning machine according to claim (2), wherein the feed bottom roller (1) and the apron bottom roller (2) are driven in common. (4) A claim in which, when the spinning speed increases or decreases, the rotational speed of all draft bottom rollers is additionally increased or decreased in excess proportion to the spinning speed (
1) A method for making yarn count uniform in a ring spinning machine according to any one of claims 1 to 3. (5) Claim (1) wherein when the spinning speed increases or decreases, the rotational speed of the spindle is increased or decreased in excess proportion to all the drafting bottom rollers.
A method for making yarn count uniform in a ring spinning machine according to any one of claims 1 to 3. (6) Claim (1) that the over-proportional/low-proportional increase in rotational speed is predetermined by a control program.
A method for making yarn count uniform in a ring spinning machine according to any one of claims 1 to 5. (7) Over-proportional/under-proportional increase in rotational speed is determined in advance by data on computerized spinning technology parameters including fiber material, yarn count, twist, traveler properties, spinning geometry and control program. A method for making yarn count uniform in a ring spinning machine according to any one of claims (1) to (5), wherein the method is set as follows. (8) The ring precision according to one of claims (1) to (5), wherein the over-proportional/under-proportional increase in the rotational speed is determined directly by the thread monitoring device and the control program. A method to equalize the thread count in a spinning machine.