DE303858C - - Google Patents

Description

. The working methods known today of the flat combing machines, which are based on the principle based, to capture the cleaned tuft by means of suitable take-off devices and After hammering in a pricking comb, the fiber ends are dutched with the very fine needles pulling the same invariably have a disadvantage. It will be when there is Fiber withdrawal next to the short ones, between the

ίο stripped fibers embedded noils and impurities — which hold back the real job of the pricking comb is - due to the fiber friction numerous hairs with in the passage openings between torn into the needles, which are actually only considered for the next print. These force themselves into the through-openings which narrow in a funnel-shaped manner and complicate the fiber passage to a considerable extent, creating strong Longitudinal stretching and breaking of the stripped fibers are caused. In fact, some of the broken ones get there Fibers in the top, the mean fiber length of which is thereby impaired. the other part in the comb, thus worsens the so-called Romaine ratio, while all fibers of the The tension band will experience permanent elongation due to the stress. The present The purpose of the invention is to bring this about. impermissible cross-sectional constrictions from the start, d. H. from the beginning of the deduction, to prevent and in the further course to counteract it effectively.

The process underlying today's standard working procedures is strict taken an inhibited default. The fiber masses accumulate behind the cutting comb. Without this inhibiting effect - if, for example, the pricking comb is not engaged would - the trigger movement would initiate a free, unrestrained delay in which further progress, the penetration of entrained fibers would come to a standstill by itself. the warped fibers would, due to the fiber friction, follow the withdrawal movement, at a slower speed, which decreases steadily after the dense fiber sliver, i.e. their individual speeds would initially all values between speed accept the withdrawal movement and the sliver. The full haul-off speed can theoretically none of the penetrating fibers' reach, due to the inhibitory effect of the. farther back fiber masses. The individual speeds experience another Reduction the further the withdrawal goes, as the fleece thins out more and more and the fiber friction that causes the entrainment decreases. This comes to a standstill come before the fiber extraction is finished.

With this in mind, the present application intends to be a free one unchecked delay even after striking

Claims (3)

of the Vorstechkammes to be selected that after that by the Abzugyorrichtung caused detection of the cleaned fiber barf the sliver at the fixed or the take-off device following Vorstechkamm is withdrawn after its impact, in order to penetrate the resulting delay Fibers not caught by the take-off device into the needles of the pre-cutting comb ίο to encounter. The method can also be carried out in such a way that the pre-cutting comb with the start of the pull-out of the trigger movement at the same speed as possible follows, as long as follows that a penetration of entrained fibers into his Needling is effectively countered. Its movement can be slowed down to the same extent as the speed of the penetrating force Fibers ■ decreases. That will depend on the fiber length and the nature of the fleece and can be regulated accordingly be designed. Incidentally, it is irrelevant whether the comb follows the trigger, the one behind Lying fiber masses ahead of it, or whether with a fixed comb and a held one By pulling back the sliver, the fiber beard created the same movement conditions will. Only the relative movements are decisive. In Fig. 1, A, A denotes a pull-off device which acts like pliers and which grips the cleaned tuft as close as possible to the pricking comb in order to pull the fiber ends through the fine needling of the same. Pre-cutting comb K and sliver remain at rest during the withdrawal, at least they do not change their mutual position. The consequence is the stagnation and compression of the entrained fiber masses immediately behind the comb, along with the disadvantageous consequences discussed above. Fig. 2 shows the state to which the proposed method aims. The pre-cutting comb K follows the withdrawal movement and retains a certain lead over the entrained fiber masses, which ensures that the fibers caught by A, A are pulled through more gently. Precondition for the exact implementation of the process is that all the fibers gripped by the withdrawal device are withdrawn at the same time, as can be achieved most reliably by withdrawing organs that act like pincers. If the rotating take-off cylinders are to be used with the running leather in between, which have proven themselves to be excellent and ensure a high level of performance of the machine, the gradual fiber removal inherent in this device must be avoided As the rotating cylinders A, A swing towards them, gradually grasp the fibers, first the most protruding ones, and pull them through the comb K (Fig. 3) Fibers as well as a shrinking and tangling of their ends behind the "comb promoted and the fiber passage is made more difficult. This can be countered by making the linear approach speed with which the rotating cylinders swing towards the beard equal to their peripheral speed. Both movements then cancel each other out, while the cylinders roll up, as it were, on the beard without first causing a trigger. This can now be done either by the rotary motion alone, as soon as the oscillating motion is slowed down or comes to a standstill, or by reversing the approach motion, by knocking out the trigger parts, or finally by combining both motions, which then add up, as is usual in the practice. If, however, the comb should follow the trigger movement at the same speed as possible - which was made as a requirement for the implementation of the inventive concept. - so, at least for the duration of this process, the rotary movement must be brought to a standstill and the trigger effected solely by the deflection movement of the trigger device. This is because the comb cannot follow a trigger accelerated by the rotary movement, since it hits immediately behind the trigger device and consequently cannot move forward faster than it. If the comb comes to a standstill, the trigger can be accelerated by continuing the rotary movement. In this way it is possible to counteract the compaction of the fiber masses behind the comb and to achieve the state which is characterized in FIG. 4 and which corresponds completely to the state indicated by FIG. ■ Patent claims: i. Method for combing textile fibers on flat combing machines, thereby characterized in that after the detection caused by the trigger device cleaned. Fiber beard the sliver at fixed or following the take-off device The pre-cutting comb is withdrawn after it has been hammered in, in order to pass through the entering Delay in penetration of the fibers not grasped by the take-off device into the needles of the pre-cutting comb to meet.; · 2. The method according to claim i, characterized in that the Vorstechkamm the Trigger movement from the beginning of the trigger at the same speed as possible follows and here leads the movement of the sliver. 3. Device for the purpose of performing the Method according to claim 1 and 2 below Use of oscillating take-off rollers, characterized in that the speed the swinging movement with which. -the rotating trigger- ■ roll approaching the tuft, equal to the peripheral speed of the same. 1 sheet of drawings.