DE3100880A1 - Bobbin creel for twisting or warping machines - Google Patents

Abstract

Slide-guided prebraking rods (15) are jointly displaceable by slides (16, 17) relative to stationary prebraking rods (14). For this, gearwheels (22) engage on the slides (16, 17) via a rack profile (20). At the same time, there can act on the gearwheels (22) a rotary slide (30) which, automatically and as a function of the starting speed of the machine up to the normal operation of the latter, returns the movable prebraking rods (15) from a stand-by point (34) during a machine standstill, via at least one intermediate position (35), into a maximum clamping position (36) and then into the normal operating position (35). This allows a readjustment of the yarn tension as a function of the starting speed of the machine and therefore an immediate commencement of the yarn-monitoring functions. <IMAGE>

Description

COIL GATE FOR SHEARING MACHINES OR SHEEPING MACHINES

The present invention relates to a creel for /, el, t el - or IJcluiritiaachinon, in which the coils, which are attached to the bobbin holders arranged in horizontal and vertical rows, withdrawn threads, each guided by a thread clamping device comprising a movable clamping jaw and by a thread monitor needle are scanned, with each vertical row between the bobbin holders and the thread clamping devices vertically, one pre-brake rod arrangement with a stationary pre-brake rod and a pre-brake rod that can be displaced parallel to it extends, between which rods all threads of the relevant vertical row of bobbins run.

A creel of this type is known from DE-OS 28 41 of the same applicant. Have here the pre-brake rod arrangements, in particular, have the task of insulating and limiting the respective thread balloon. the Movable Vor ^ remsstangen are common from the normal Braking position can be moved into a disposal position and back. In the disposal position, they allow one unhindered manipulation of the coils.

When such a creel is in operation, all threads drawn off the bobbins pass through the associated pre-brake Rod arrangements partially wrapped around their rods, then around the clamping gap of the relevant To enforce thread clamping device. The thread is then deflected around the KadonwMchtornadol to the Winding tree down.

When the machine is shut down, all thread clamping devices close to keep the entire thread field taut.

When restarting, all thread clamps must be opened again relatively quickly in order to avoid overloading the to avoid threads pulled off the winding machine. But since, on the other hand, the machine has a longer start-up phase until it reaches its normal, the normal thread tension essentially determining withdrawal speed needed, it comes after the sudden opening of the Thread clamping devices lead to a rapid drop in thread tension, resulting in thread monitoring by means of the thread guard ternadel prevented until the threads have at least approximately reached their normal thread tension again.

During this time, thread breaks that occur cannot be detected. Previous compenuiil ion:; inuiSi; ruihiiHMi in 1 · '< > ιπι

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longer closing times for the thread clamping devices lead to high signs of wear in particular on the movable clamping plates.

Kü iiJl .sobject of the present invention To create creel of the aforementioned type, which allows the disadvantages of known arrangements to be avoided and in particular without additional burden of the threads and, with less stress on the thread clamping devices, monitoring of the threads immediately after the order has been initiated.

This is achieved according to the invention in that the parallel Vorb resins rod η allot Vorbr (; ins-rod arrangements for readjustment of the thread tension depending on the start-up phase of the machine up to their normal operation via common control and drive means from a disposal position when the machine is at a standstill via at least one intermediate position that is not yet or just exciting the thread into a thread maximum exciting position can be moved and then reset to a normal operating position.

The configuration is then preferably such that the intermediate position corresponds to the normal operating position, where-

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then the normal operating position can be preset.

It is advantageous if the displacement of the relocatable pre-brake rods from the disposal site jump to the intermediate position and from the intermediate position to the clamping position proportional to the increase in Start-up speed of the machine takes place.

With these measures, after opening the pad clamping devices immediately after the machine has been started up a "softer", relatively less Achieve a drop in tension on the threads and as immediate as possible a monitoring of the threads by means of the thread monitor needles.

In the case of a creel, in which the displaceable pre-brake rods are slide-guided, with a toothed wheel engaging the slide via a rack, the training can be so that the control and drive means a rotary piston valve acting on the gear and at least one, intermediate positions of the movable pre-brake rods indicating pneumatic position switch.

Here it is advantageous if the Pneumnti ksclial t he via a switch roller with an adjusting cam on the sciIi i ti en

interacts, the position of the pneumatic switch then being adjustable relative to the longitudinal extent of the slide arrangement is.

A preferred embodiment then continues to exist da-0'3 rin that the pneumatic switch is arranged on a movable support that can be operated with a hand before:; I el I spindle closed min. .

An example embodiment of the subject matter of the invention is explained in more detail below with reference to the drawing. Show it:

1 shows a schematic representation of a creel reduced in height to two bobbins, for example one Warping machine, half side view;

Fig. 2 is a plan view of a detail of the arrangement according to Fig.l with the inventive control and drive means of a pre-brake rod assembly;

3a in a schematic representation and in plan view to 3e the individual operating positions of the two pre-brake rods according to a pre-brake rod arrangement

Fig. 3 to each other and with respect to the thread clamping devices concerned, and

4 shows a graphical representation of the course of the thread tension on a bobbin winder as a function of different bot \ iobsphdKon.

According to FIGS. 1 and 2, the creel shown includes oil or oil for a not shown in detail Warping machine in a known manner a plurality of horizontal and vertical rows of bobbin holders in Form of spindles 3, which from a plurality of mutually parallel and, in the example shown, extend perpendicularly Project support tubes 2. In a manner not shown in detail, these support tubes 2 are, for example, via round chains 5 supported on the machine frame. In a known manner, a coil 4 is attached to each of the spindles 3, from which the threads F are withdrawn together when warping or warping and are placed on the winding beam, not shown in detail be wound up on the machine. This arrangement carrying the coils is referred to as coil board 1.

0 A so-called brake board 6 is arranged in front of the reel board 1, seen in the withdrawal direction, which has vino lines Ouertraverse 7 and an upper crossbar 8 am not

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includes machine frame shown in more detail. From the cross members 8 protrude outriggers 9 and 10, between which there are vertical profile supports 11 extend, corresponding to the number of vertical rows of coils of the coil board 1. Each Profile support II has a number of thread monitor needles corresponding to the number of bobbins 4 in a vertical row 12, as well as a movable clamping plate 13 for each thread F, the latter with a corresponding Counter surface on the profile support 11 cooperates to form a thread clamping device. All clamping plates 13 are can be operated jointly via means not shown in detail.

Immediately in front of each profile support 11 between these and the support tubes 2 of the coil board 1 are each a Arranged pair of pre-brake rods 14, 15, with a stationary pre-brake rod 14 and one that can be displaced parallel to this Pre-brake rod 15, between which all threads of the relevant vertical row of bobbins run. The stationary pre-brake rods 14 of all brake rod assemblies are fixed at their ends to the lower and upper boom 9 and 10, respectively. The linden of the displaceable pre-brake rods 15, however, are fixed in a lower and upper slide 16 and 17, respectively

stored. The carriages 16 and 17 are in a lower and upper guide rail 18 and 19, which extends over Parts of the gate length extend on the lower and upper boom 9 and 10, respectively, and are supported so as to be displaceable together. At least at one end of the creel, the lower or upper carriage 16 and 17 raqt over the lateral lower and upper arms 9 and 10, respectively, and goes into a toothed tamjen profile 20 at this point above. With the rack profile 20 of the lower and upper carriages 16 and 17 meshes on a common Gear wheel pair 22 seated on shaft 21. By rotating the gear wheels 22, the carriage pair 16, 17 and so that the movable pre-brake rods 15 supported by the latter can be moved back and forth (FIG. 2).

So far, creels of the type described above are generally known, with a handwheel, not shown on the shaft 21 allows the displacement of the movable pre-brake rod 15 relative to the stationary pre-brake rod manual adjustment of each pre-brake rod arrangement. the movable pre-brake rods when the machine is at a standstill, for example for an unhindered bobbin change or for Elimination of a thread break from the pre-cut position in a disposal position for the stationary Vorbrenissi.armen away · / .iir.I rush.

Run through the prescribed arrangement during operation the threads F withdrawn from the bobbins 4 the Vorbremsstanqenordnung with partial wrapping around them Rods 1Ί and 15, and the clamping gap of the relevant Ü5 thread clamping device 11, 13 to then, with partial looping of the associated thread monitor needle 12, for To get to the winding beam, not shown, which pulls the threads from the bobbins 4 while rotating.

If the system is shut down, for example to change the bobbin or to repair thread breaks the KLenun plates 13 together to the corresponding Goqenflachen pressed against the profile supports 11 and thus the threads clamped. By doing this, as already mentioned, is triggered simultaneously for all thread clamping devices 11, 13, of the creel, is at a standstill the entire thread field kept taut on the machine.

If the machine then starts up again, the thread clamping devices 11, 13 are closed in good time open that the threads are under the tension of the winding tree not be overloaded. However, this causes, as some t: boons such a strong momentary drop in thread tension, that the effect of the thread monitor needles 12 only set in with an undesirably long time delay

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can, as will be explained in more detail below.

In order to solve the problem according to the invention, namely a drop in thread tension below the minimum functional tension for effective thread monitoring immediately after restarting the machine and after that To prevent loosening of the thread clamping devices, the parallel displaceable Vorbremsstangon 15 of all Vorbroms rod arrangements for readjustment of the thread tension depending on the increasing start-up speed of the Machine up to its normal operating speed via control and drive means to be explained in more detail below adjusted from the aforementioned disposal position to the maximum tensioning position for the thread and back out of this brought into the normal operating position.

Various control and drive means are conceivable for this. In the present case, these tax and drive means a rotary piston valve 30 between its open cylinder 31 and its closed cylinder 32 a tooth profile piston rod 33 is arranged, which also the upper or lower gear of the gear pair 22 for Displacement of the slides 16, 17 carrying the pre-brake rods 15. The maximum immersion depth of the

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Piston rod 33 in the open cylinder 31 or in the closed cylinder determines the end positions of the movable pre-brake rods 15. This is the aforementioned disposal position dor prebroming rods 15 as shown in Fig. J with L 34, the intermediate or normal operating position is denoted by 35 and the tensioning position that is the maximum tensioning of the thread is denoted by 36.

For the adjustable definition of this aforementioned intermediate or normal operating position 35, an im is used here Pneumatic switch 37, not shown in more detail, of the rotary piston valve 30, its switch role 38 cooperates with an adjusting cam 39 on the relevant lower or upper slide 16 or 17, thereby accumulating the Switch roller 38 when adjusting the carriage concerned on the adjusting cam 39, the control circuit of the rotary piston valve 30 receives a signal, for example a momentary stop signal. As FIG. 2 shows, the position of the pneumatic switch 37 is relative to the longitudinal extension the relevant guide rail 18 or 19 adjustable, for which the pneumatic switch 37 on a bewoijliehen Support 40 is attached, with a Verstellspindol 4] interacts with a handwheel 42, never in any case dos supports 40 can be read off via a pointer 43 on a scale 44.

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As FIG. 3 a now shows on the basis of two horizontally adjacent coils 4, the clamping plate 13 is in normal operation put away from the profile support 11 and the bot-hitting movable pre-brake rod 15 in the normal operating position 35, in which the thread F is not touched here. This thread F wraps around the thread guard tornado 1 12 at 90 ° and is deducted in the direction of arrow 45. This normal be-Lriubss part 35 can also be enjoyable;:; I · 'i q. Io κι ΐη, where liio movable pre-brake rod 15 the thread! · 'ot.was /.wischen tii * ι stationary pre-brake rod 14 and the profile support 11 has retracted. According to the above, this situation can be achieved by means of Handwheel 42 can be set, corresponding to the illustration according to FIG. 2.

If the machine is now stopped, for example by means of the thread monitor needle 12 on the left bobbin according to FIG. 3b as a result of a thread break, the Regulk receives rc? ir. dos Rotary piston valve 30 sends a corresponding signal to swiiiil. borrowed mobile pre-brake rods 15 by the action of the AufZylinders 31 via their carriage 16, 17 in the said To move disposal position 34 in the direction of arrow 46 (Fig. 3b). The machine is switched off at the same time clamping all of the threads F in the aforementioned manner.

With the re-commissioning of the winding machine now receives

in a first start-up phase in which the thread clamping devices 11, 13 are still closed, but the thread monitor needle 12 has already been returned to its scanning position (F-'i-cj. 3c), the control circuit of the »rotary piston valve 30 a signal, according to which the rotary piston valve all mobile pre-brake rods 15 by the action of the cylinder 32 in the direction of arrow 47 back against the stationary pre-brake rods 14 into an intermediate position 35 brings which intermediate position expediently corresponds to the normal operating position shown in Fig. 3a or in Fig. 3e. This position can, as described above, by the from. Control cam 39 actuated pneumatic switch 37 signals been. Here it is useful if the distance from the disposal position 34 in the intermediate position 35 quickly is overcome.

The further start-up phase now takes place practically at the same time with the opening of the thread clamping devices 11, 13 a continuously increasing pre-tensioning of the thread proportionally the increase in speed of the rocking drum 0 by moving and immersing the Ijowocj] ichen pre-brake rods 15 between the stationary ones Vorbrenisa tangon 14 and the profile carriers 11 (Fig. 3d).

As soon as the winding machine has reached its normal speed, a reversing signal takes place in the control circuit of the

Rotary piston valve 30 a return of the movable Pre-brake rods 15 in the above-described normal operating position 35 according to FIGS. 3a or 3e.

At this point it should be mentioned that the above-described control of the movable pre-brake rods 15 is of course can also be achieved in other ways without departing from the inventive concept. For example, can all shifts with servomotors or the like. Be made and the entire control via microprocessors take place. '

The functional sequence according to the invention described above is explained in more detail below with reference to the graphic representation according to FIG. The dashed Curve Fj shows the course of the thread tension from the moment the machine is started until it is reached the normal working speed of the winding machine concerned without the application of the orfindungsgemässen This curve Fj follows the relationship between thread tension Z and time t. Then the winding machine downstream of the creel set in motion, then the thread tension rises first as a result of the clamping of the thread by the closed

Clamping plate 13 in the time t- ^ to a maximum value Z- ^. When the clamping plate 13 is opened, the thread suction drops quickly to a voltage value 7> 2 '. This voltage value Z2 is below the minimum functional voltage Z5, which is necessary for an effective thread monitoring function by means of the thread monitor needle 12. However, this means that within the time segment t .- ^, up to which point in time the tension of the thread F _{1 has} again reached the value Z5, thread monitoring by means of the thread monitor needle 12 is not possible. Only after the normal working speed has been reached, namely at time t. ^ 1 , the thread F has reached its normal tensile stress ν , which then remains constant.

From the above, it can be seen that the time t for the closed state of the clamping plate 13 must be kept as small as possible so that the thread is not overstrained is exposed, apart from the wear and tear on the clamping plate. This limited time t thus prevents also, that by clamping the thread for a longer period of time, a tension drop on the thread below the minimum functional tension Z for an effective Fcidenüberwachungsfunkt ion occurs by means of the thread monitor needle 12.

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In order to prevent the tension on the thread in question from dropping below the minimum functional tension Ζ _ς for an effective thread monitoring function, a time t occurs practically simultaneously with the start-up of the machine. continuously increasing

tension the thread according to the dash-dotted curve F in Figure 4 by the above-described adjustment of the pre-brake rods 14, 15 relative to one another.

By superimposing the tensile forces on the thread according to the curves F and F in Figure 4 then results an actual course of tension on the thread according to the solid curve F ″, which shows that aich the course of the thread tension practically approximates a Sirius shape with a soft and relatively low one Voltage drop to the value Z ^ after opening of the clamping plate 13 and without a significant increase in the tensile stress to the value Z even during the clamping time t

Without having to give the thread a significant additional load during the clamping phase, it can now by the measure according to the invention the UebiTwuchumj of the thread immediately after starting the device, so that no unresolved thread breaks are processed will.

In addition, the measures according to the invention allow a Shortening the closing time t of the clamping plates 13, which considerably reduces their wear and tear and also allows that knots in the thread can pass again as quickly as possible, thus avoiding new thread breaks.

Claims (8)

PATENT CLAIMS 1. Bobbin creel for Zettel- odor Schärniasch i non, at. wolchom those withdrawn from bobbins ninri on bobbin holders arranged in horizontal and vertical rows Threads, each through a movable "toilet jaw." comprehensive thread clamping device are guided and scanned by a thread monitor needle, wherein between the bobbin holders and the thread clamping devices of each vertical row a vertical pre-brake rod arrangement with a stationary and a pre-brake rod displaceable parallel to this extends, between which rods all the threads of the vertikiilcn concerned Coil row run, characterized in that the parallel relocatable Vorbromsstancjun (Ib) of all pre-brake rod arrangements (14,15) for readjustment of the thread tension depending on the start-up phase of the machine until their normal operation via common; Control and drive means (16-22, 30-33) from a disposal position (34) when the machine is at a standstill for at least an intermediate position (35) that is not yet or is just tensing the thread into one that is maximally tensing the thread Position (36) movable and then into a normal bot.r i.obi; -wIο llung (35) can be rolled back. 2. creel according to claim 1, characterized in that that the intermediate position (35) corresponds to the normal operating position (35). 3. creel according to claim 1 or 2, characterized - /. O I need the normal operating position (35) to pre-enter is cash. 4. creel according to one of claims 1 to 3, characterized in that the displacement of the displaceable Pre-braking catch (15) from the disposal position (34) to the intermediate position (35) suddenly and from the Intermediate position (35) in the clamping position (36) proportionally to the increase in the start-up speed of the machine. 5. Spool creel according to one of the preceding claims 1 to 4, in which the displaceable pre-brake rods (15) are slide-guided, a gear wheel (22) engaging the slide (16, 17) via a rack (20), characterized in that the control - and drive means a rotary piston valve (30) acting on the gearwheel (22) and at least one intermediate position of the movable pre-brake rods (15) . ic] (Mulen pneumatic position switch (37) uinfcissun. * » & Ο α ο» β - ■ · 6. creel according to claim 5, characterized in that the pneumatic switch (37) has a switch role (38) interacts with an adjusting cam (39) on the slide (IG, I7). 7. creel according to claim 5 or 6, characterized in that that the position of the pneumatic switch (37) relative to the longitudinal extent of the carriage assembly (16.17 or 18.19) is adjustable. 8. creel according to claim 7, characterized in that that the Pneumatikschlater (37) is arranged on a movable support (40) which is connected to a manually operated adjusting spindle (41) cooperates.