DE2010145A1 - Device for braking yarn bobbins in creel - Google Patents

Description

Continental Gummi-Werke Aktiengesellschaft, Hanover

Device for braking yarn bobbins in creel

The invention relates to devices for braking yarn bobbins in creel through an adjustable braking force

For pulling the multitude of threads from the thread spools one The precise control of the thread tension is indispensable for the creel, in order to obtain a thread sheet of uniform consistency and to exclude thread breaks as far as possible. It is known, for this purpose the individual bobbins or the bobbin carriers rotating with the bobbins due to the thread tension Braking devices provided with and these of weight-loaded To influence dancer rollers to associated limit switches. For higher requirements for compliance with tight tolerances and the delay-free reduction of occurring voltage peaks the known devices are no longer sufficient, and it was therefore not the desired uniform stress distribution in to reach all running threads. The invention arises as the task of enabling smooth thread withdrawal while maintaining tensile stresses that are as constant as possible, where the same or at least practically the same voltage values set in all unwinding threads as a prerequisite for an end product of consistently uniform quality and can be sustained.

This task is performed with devices of the type mentioned at the beginning solved in that the directly or indirectly on a spool of thread acting braking force in inverse proportion to the Tension of the running thread is made adjustable, expedient

BATH ORIGINAL

109839/07310 * 2 -

moderately with the help of a path-dependent regulating the size of the braking force Actuator which is movable with changes in the tension of the thread guided in operative connection with the actuator. In an advantageous embodiment of the invention, the actuator is designed as a lever pivotable about a fixed pivot point, on the one hand with the braking means producing the braking force, for example one with the circumference of one with the bobbin coupled brake disc surrounding brake band, is in operative connection and on the other hand one of the thread at least wrapped around part of its circumference, freely rotatable bearing a bearing leadership role. The arrangement is made so that the constant by a weight or a spring Lever loaded in the braking sense under the action of the thread tension introduced via the guide roller in the sense of a reduction the braking force is pivotable.

The invention creates a finely-tuned, responsive control system in which the brake means as an actuator attacking braking and thread guide forces opposing each other Generate torques and as a result constantly seek to level off to a state of equilibrium. By Specification of a certain braking force that can be set arbitrarily by adjusting a thread tension or shifting a braked weight can be selected and set as the initial value, arises in automatic control processes under partial Reduction of the initial braking force reduces the thread tension to a practically constant value. Irregularities in the Thread guidance, as for example due to incorrect thread position caused on the coil and can appear in the form of voltage peaks are caused by mutual influence the effective braking force is absorbed and balanced as it arises. The high sensitivity of the invented

109839/0730 BAD OR ₁ GlNAL

Appropriate device therefore allows only small fluctuations the ping-controlled value of the flushing deceleration. It is as a result also possible, consistently uniform for a large number of spools of thread Adjusting tensions in the running threads and thereby gaining a thread sheet, which is uniformly pre-tensioned in all parts, as the end result. Through the right to function Operation of the device manages to master even extreme operating conditions and states, such as the 'VprHT' processing of highly twisted threads that can easily become jammed incline in the course of the cadre and so far only difficult to adhere to proiicr care to be treated, or immediate suppression the annoying bobbin overrun and thus avoidance of loose threads when switching off the winding drive. Another advance ■ fceiJ the device according to the invention can still be seen in • 'ifjii -nie. quickly and easily by simply changing the initial fire force can be converted to handle different goods.

The invention is based on the schematic representation of a Embodiment illustrated in the drawing.

The drawing shows the arrangement diagram of the device in side view. On a carrier 1 of the support frame of an Oatter cell i. «T a brake disk 3 wrapped around a part of its circumference by a brake band 2 is supported so that it can rotate freely around a pivot k. The brake band 2 is on the one hand fixed to a holder 5 placed on the carrier 1 and on the other hand is connected to a brake lever 7 via a damping spring 6. The brake lever 7, in turn, is pivotably deflected at one end to an attachment 8 of the carrier and at its free end carries a rotatably mounted thread guide roller 9 'by a displaceably attached weight 10, which is located in the area between the guide roller 9 and the fastening point of the brake band 2 arbitrarily adjusted and

109839/0730 - h -

BAD OBiGrNAL

can be clamped in any position with the help of clamping screws 11 and that it is constantly in the clockwise direction seeks to pivot, the brake lever is left in the braking direction »To cushion excessive angular deflections in both directions BJnri rubber buffers 12 or other elastic suspension elements intended.

Cinema not drawn bobbin of yarn from which the thread 13 tangles is drawn off with the brake disc 3 directly in releasable connec tion, such that the torque generated by the cable on the bobbin circumference also sets the brake disc in rotation. The running thread 13 first runs onto a deflecting roller lh resiliently mounted in a fixed relation to the carrier 1 in order to be fed to the guide roller 9 on the brake lever 7 via a fixed guide eye 15. With the help of a downstream deflection roller 16 arranged in a rotatable bearing on the carrier 1, the thread is guided around the guide roller 9 so that the arc of loop coincides over an angle of the order of 180 ° with the lower half of the roller surface in the drawing. In this arrangement, the thread forces form a resultant which acts against the force of gravity of the weight 10 on the brake lever 7 and seeks to pivot it counter-clockwise in the sense of reducing the braking force.

In the rest position, i.e. with the winding drive switched off and consequently With loose, tension-free thread 13, the brake band 2 is full tightened to the brake disc 3. The initial value of the abandoned Braking force can be adjusted at will by moving the weight 10 and moving the attachment point for the Adjust the brake band on the brake lever 7. As soon as a tension is built up in the thread 13 after switching on the winding drive, if the brake lever swings upwards in the sense of releasing the brake,

109839/0730 BADORIGfNAL

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2010H5

until the equilibrium between the opposing forces on the brake lever is reached. The damping spring 6 has proven to be important for the soft and elastic braking of the yarn package, since it prevents the control system from jerking upwards. Similarly, also the guide roller 9 acts directly upstream fixed Führungöse 15 from low. As soon as the thread tension collapses with the winding drives being switched off, the band brake falls under the full force of gravity of the weight 10 with the undiminished circumferential braking force, so that the brake disk 3 and thus the wire spool are stopped without delay. ■

1098 39/0730 _ - 6 -

Claims (1)

20Ί0Η5 Claims; 1. Device for braking yarn bobbins in creel by a controllable braking force, characterized in that the braking force acting directly or indirectly on a bobbin is adjustable in inverse proportion to the tension of the running thread (13). " c. Device according to Claim 1, characterized by an actuator which regulates the magnitude of the braking force in a path-dependent manner and which can be moved with changes in the tension of the thread guided in operative connection with it. 3. Apparatus according to claim 2, characterized in that the Actuator is designed as a lever (7) which can be pivoted about a fixed pivot point and which, on the one hand, provides the braking force causing braking means is in operative connection and on the other hand one of the thread (13) at least over a part around its circumference, freely rotatably mounted guide roller (9) carries. '+. Device according to Claim 2 or J5i, characterized in that that the loaded by a constantly effective braking force actuator under the action of the thread tension in the sense of a Reduction of the braking force is pivotable. 5. Device according to claims 3 to k, characterized by such an arrangement of the guide roller (9) wrapped around by the thread (13) that the torque exerted by it on the actuator (7) is opposite to that exerted by the braking force. 109839/0730 6 «Device according to claims 3 to 5» characterized in that that the guide roller (9) at the free end of the through a Weight (19) or an actuator loaded in the braking direction (7) is arranged * 7. Device according to one of claims 3 to 6, characterized in that it has a fixed guide (15) connected upstream of the guide roller for the thread (13) running onto the roller circumference. 8. Device according to one of claims 3 to 6, characterized in that the braking means, e.g. The brake disc (3) wrapped around the yarn bobbin, wrapped around the brake band (2), via a spring (6) with the actuator (7) are in operative connection. 9. Device according to one of claims 3 to 7i, characterized in that the range of motion of the actuator (7) according to is limited in both directions by spring elements (12). Hanover, March 2, 1970 70-11 P / 10 G / South South / Ba 109839/0730 Blank page