JP7458768B2 - Ring spinning machine with draft section - Google Patents

Description

The present invention is a ring spinning machine having a draft section, the draft section being formed by a pair of rollers, each pair of rollers rotating at different rotational speeds, and having a group of bottom rollers of machine length. The roller group relates to a ring spinning frame, in which the roller group is formed by partially grooved roller segments, and the bottom roller group is each equipped with a length compensation device.

Ring spinning machines with machine-length draft section assemblies positioned in both the front and rear machine areas have been known for many years and are described in detail in part in numerous patent applications.

Such a machine-length draft section assembly has a bottom roller, which is typically formed by a machine-length group of bottom rollers, which are themselves connected to each other in a relatively non-rotatable manner. It consists of multiple roller segments.

In the area of the working unit, a top roller rests on the bottom roller group, the top roller being driven in a frictionally connected manner by the bottom roller group and together with the bottom roller group forming a roller pair. In this case, the bottom rollers of the machine length are usually driven by a relatively strong electric motor, which is arranged in the drive frame of the textile machine on the machine end side, and which, for example, has an interposed reduction gear. Through this, the front roller pair, the middle roller pair and the back roller pair each rotate at different rotational speeds, thereby serving to properly draw the provided fibrous material.

In the case of high-performance draft sections, as used in modern ring spinning machines and described, for example, in US Pat. No. 7,937,924, the middle roller pair of the draft section is often additionally equipped with a so-called apron. The bottom rollers of such a draft section are usually additionally supported rotatably in the area of a so-called roller stand, the front bottom roller being often supported on a slider which is arranged slidably in a set manner on the roller stand, so that the draft width of the preliminary draft area can be adjusted. The bottom rollers of the middle and back roller pairs are also often supported on the roller stand in corresponding bearing devices.

However, in ring spinning machines constructed in this way, which usually have a number of working units arranged side by side, each operated by one of a plurality of draft sections, in the region of the draft section, Various problems often occur if appropriate measures are not taken. The draft rollers of the bottom roller group are not only subjected to some relatively strong torsional loads, for example due to the introduced torque, but also expansion of the length of the draft rollers often occurs due to heating. In this case, in particular, the degree of torsion of the individual bottom roller groups depends on various factors, such as the diameter of the draft roller, bearing friction, restraint due to tension of the apron, etc., and may vary greatly.

The various torsions in the draft rollers of the bottom roller group do not necessarily have an adverse effect during the running of the draft section, but since the torsions in the draft rollers increase and decrease in various ways over time, the draft during acceleration or deceleration of the draft section Errors often occur. That is, depending on whether the twist of the draft roller leads or lags with respect to the draft roller connected upstream or downstream of this draft roller, thin or thick spots will appear in the yarn, which will affect the quality. This may result in a decrease in the quality or thread breakage.

Various proposals have already been made in the past in order to prevent different torsions as much as possible, or at least to reduce them to a value that is not undesirable, in the draft section, especially when the bottom roller group is relatively long.

For example, it has been proposed to arrange a further gear transmission at the end of the bottom roller group opposite to the draft section drive, which further gear transmission is activated when the draft section is started. It serves to at least maintain the various angular positions of the bottom roller group that occur when stopped or at rest.

Furthermore, in connection with ring spinning machines with a long draft section, the bottom roller group has been equipped with a draft section transmission device, and each draft section transmission device is located approximately in the center of the length of the bottom roller group. It has also been proposed that each long bottom roller group is equipped with at least one free end thereof an auxiliary motor that introduces a torque.

However, the arrangement of the draft section transmission in the central region of the length of the draft roller has the disadvantage that the serial division of the working unit is interrupted at that point, which significantly complicates the structure of the ring spinning frame. It has some disadvantages.

According to another comparable proposal, described for example in DE 10 2015 010 854, powerful drives are used at both ends of the bottom roller group, in this way the torsion in the bottom roller group is prevented. Avoided as much as possible.

Furthermore, for example from DE 10 2005 054 817 A1, a ring spinning machine is known, the draft section of which has a main drive at the machine inlet side and a further auxiliary drive in the extension of the bottom roller group. This known, relatively complex draft section assembly could not be achieved in practice either.

Uncontrollable length expansion of the draft section rollers can also lead to serious operational troubles in ring spinning machines, and various solutions have already been proposed to solve this problem.

In practice, in the context of a ring spinning machine with several draft sections of machine length, it has been found, for example, that the bottom roller groups of these draft sections each consist of two roller segments of approximately the same length, and that the roller segments themselves is widely known to be composed of a plurality of roller members. Two roller segments of approximately the same length are each connected at their end to a drive and are movable in the axial direction via a so-called cylinder separation in an approximately central region of the ring spinning frame. Yes, but not rotatably connected. That is, although such known cylinder separations can compensate for thermally induced length expansion of the roller segments, such cylinder separations can be used to transfer the distance from one roller segment to the other. No torque can be transmitted to the segment.

In another known configuration, in the draft section of the machine length, at the beginning of each group of bottom rollers, a cardan shaft is installed, which is connected to the respective bottom rollers that occur during operation of the ring spinning frame. Compensate for group length expansion. However, such a structure is not only extremely complex, but also, in such an arrangement, the entire length expansion of the bottom roller group acts exclusively in one direction, which is highly problematic.

Starting from the above-mentioned prior art, the problem underlying the present invention is to provide a ring spinning machine in which the draft section is configured so that the bottom rollers are not damaged by excessive loads due to torsion or length expansion.

According to the invention, the length compensation devices integrated in the bottom roller groups are constructed and arranged in such a way that both length compensation and torque transmission are possible with respect to the respective bottom roller groups. Solved by

Preferred forms of the invention are the subject of the dependent claims.

In other words, the configuration and arrangement of the length compensation device according to the invention not only reliably ensures that the torque introduced by the drive to the bottom roller group during operation of the ring spinning machine is always transmitted over the entire length of the bottom roller group, but also ensures that, if necessary, the length compensation device immediately compensates for any length expansion that occurs in the area of the bottom roller group, which is usually caused by heat.

In this case, according to an advantageous embodiment, the length compensation device each has a compensation shaft and a holding part, the compensation shaft and the holding part being positively connected shafts. The compensation shaft forming the hub connection preferably has a P4C polygonal profile (cross-sectional shape as defined in German Industrial Standard 32712). Such a P4C polygonal profile does not have a notch effect, unlike most conventional axially slidable profiles. That is, since only torsional loads are applied to a shaft with a P4C polygonal profile, such a polygonal shaft has a fatigue strength that is approximately 30% higher than, for example, a splined shaft profile.

Preferably, the compensation shaft is rotatably supported on the bottom roller bearing via a bearing sleeve. The roller segments of the bottom roller group are preferably each axially slidably connected to the compensation shaft via a holding part. The roller segments of the bottom roller group preferably each have a connecting member including a holding part.

Such a configuration has the advantage, in particular, that the corresponding roller segments of the bottom roller group are not only reliably connected to one another in terms of drive via the compensation shaft of the length compensation device according to the invention, but are also reliably and precisely positioned via a bearing sleeve rotatably supported in the bottom roller group.

Furthermore, the design of the compensating shaft according to the invention, together with the attached retaining part of the roller segments of the bottom roller group, makes it possible, during the spinning operation of the ring spinning frame, to prevent damage to the roller segments of the bottom roller group due to heat, for example. It is also ensured that when a length change occurs, it is always compensated immediately by an axial sliding movement between the compensation shaft and the holding part.

In an advantageous embodiment, the connecting element with the retaining part is in each case mounted in a relatively rotationally fixed manner by a press fit on one of the roller segments of the bottom roller group. Such an arrangement makes it possible to realize a reliable and durable connection device in the end region of the roller segments of the bottom roller group with relative ease, which, moreover, can be realized at a relatively low cost. Manufactured in

A very advantageous configuration is also obtained if the bottom roller bearing is supported relative to the length compensation device on a roller stand which is arranged approximately in the machine central region of the ring spinning frame. Such a support ensures relatively easily that the roller segments of the bottom roller group are properly rotatably supported over their entire length, especially in the area of the length compensator.

Preferably, the bottom roller bearing is constructed in such a way that the bearing sleeve on which the compensation shaft is mounted can be inserted from above into the bottom roller bearing, which can be opened by pivoting the pivot member, and can be locked into the bottom roller. ing. Such an arrangement makes it possible, for example, to remove worn or damaged bottoms, since the bearing sleeve can always be positioned in the bottom roller bearing and fixed there relatively problem-free and without significant time costs. Replacing the roller group is significantly facilitated and simplified.

In an alternative form, the length compensator can in principle also be formed by an axle-hub connection, the compensation axis of the axle-hub connection being configured as a splined axis, the splined axis being Corresponds to the corresponding inner centering part. However, as suggested in the above description, a length compensator with a splined axis has a longer length in the long run compared to a length compensator in which the compensation axis has a P4C polygonal profile. This has the important disadvantage that notch effects occur which can have an adverse effect on the fatigue strength of the fatigue compensator. The P4C polygonal profile allows a higher torque transmission compared to other form-fitting axle-hub connections, or can be configured with a correspondingly smaller amount for the same torque. The P4C polygonal profile allows particularly good longitudinal sliding of the shaft and hub relative to each other under torque and central loads. Thereby, the distance between the length compensators or the length of the roller segments may be more than 60 meters.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

1 shows a ring spinning machine in which the draft section has roller pairs and the bottom roller groups are each equipped with a length compensation device constructed according to the invention; 1 shows an enlarged side view of the draft section of a ring spinning frame, which has, as usual, a front roller pair, a middle roller pair and a back roller pair; FIG. 1 shows a general schematic plan view of a bottom roller group in a draft section assembly of a ring spinning machine; FIG. 1 shows a slightly oblique perspective view of two roller segments of a bottom roller group and a length compensation device constructed in accordance with the present invention disposed between the roller segments. 5 shows the individual parts of the length compensation device according to FIG. 4 in a perspective view; FIG. 4 shows the length compensator according to FIG. 4 in a partially sectional side view in the assembled state; FIG.

FIG. 1 shows a ring spinning frame 1 in a schematic cross-sectional view. The draft section 10 of the ring spinning frame 1 has roller pairs 21, 22, 23, respectively, and in this case, the bottom roller groups 21u, 22u, 23u are each equipped with a length compensator 31 configured according to the present invention. It is being

In the embodiment shown, the ring spinning frame 1 has a pedestal 2 from which a vertical stand tube 3 extends upwardly, the stand tube 3 preferably being rectangular in cross section. It supports the suction duct 4 configured as follows. A bridge member 5 is attached to the stand tube body 3, and the bridge member 5 itself holds two mutually parallel support tubes 6 extending in the longitudinal direction of the machine, and the support tubes 6 include a plurality of rings. A bearing housing for the spinning spindle 7 is fixed, on which the spinning cop 8 is wound up during the spinning operation.

In the illustrated embodiment, so-called roller stands 9 are attached to two support tubes 11 extending in the longitudinal direction of the machine. Bottom roller groups 21u, 22u, 23u of the draft section 10 are supported on the roller stand 9, and the bottom roller groups 21u, 22u, 23u form roller pairs 21, 22, 23, respectively. 21, 22, and 23 rotate at different rotational speeds, and draw the roving material 12 at that time.

The ring spinning frame 1 furthermore has a vertically arranged support 13 for the roving material creel 14 . In this embodiment, a roving bobbin 15 is suspended from a roving material creel 14, and the roving material 12 of the roving bobbin 15 is deflected via a deflection rod 24 or the like, so that the draft portion drawn out by 10.

A part of the motion mechanism 25 of the ring spinning machine 1 is also mounted to the side of the suction duct 4. That is, in this area, the lift device for the ring rail 18, the balloon control ring 19, and the yarn guide 20 supported so that it can slide vertically are arranged.

A bobbin changer 33 is furthermore attached to the arm 32 of the frame 2 of the ring spinning machine 1, which mainly consists of a plurality of shear systems with shear arms, a gripper bar and an empty tube gripper arranged on the gripper bar. In this case, the shear systems can be actuated by a push/pull tube running along the ring spinning machine 1.

FIG. 2 shows the draft section 10 in an enlarged side view, in which each of the driveable bottom roller groups 21u, 22u, 23u extending in the machine length direction of the draft section 10 has a length configured according to the invention. A distortion compensation device 31 is provided. As is known, such a draft section 10 has top rollers 21o, 22o, 23o in addition to bottom roller groups 21u, 22u, 23u, and the top rollers 21o, 22o, 23o are used during spinning operation. It is placed on the bottom roller groups 21u, 22u, 23u, and is carried by the bottom roller groups 21u, 22u, 23u in a frictional connection manner.

In this case, the bottom roller groups 21u, 22u, and 23u are supported on the roller stand 9, for example, via sliders 41. In this case, the exact assembly positions of the bottom roller groups 21u, 22u, and 23u, i.e., the distance between the sliders 41, can be adjusted by corresponding screw bolts, etc.

The machine-length bottom roller groups 21u, 22u, 23u usually consist of a plurality of roller segments, each of which is provided with a structuring 40 in the area of the working surface. In this case, furthermore, as shown in FIG. 3, the bottom roller groups 21u, 22u, 23u can be driven in a predetermined manner via a drive device 27 arranged at the end of the machine. In other words, the bottom roller groups 21u, 22u, 23u are connected to an electric motor drive device 28 via a reduction gear transmission 29 configured as a variable speed gear transmission, for example, so that the bottom roller groups 21u, 22u, 23u are connected to an electric motor drive device 28. The rotation speed can be set. In this case, the draft value of the preliminary draft area 35 located between the front roller pair 21 and the middle roller pair 22, the middle roller pair 22 and the back roller pair 23 and the draft value of the main draft area 36 arranged between them can be adjusted in a predetermined manner.

As can be further seen from FIG. 2, a support 45 is fixed to the roller stand 9 via a holding rod 16, and a swing carrier 26 and a load arm 17 of the draft section 10 are supported on the support 45, respectively. ing. In this case, the top rollers 21o, 22o, 23o of the draft section 10 are supported in a paired arrangement on the swinging carrier 26, in a known manner via corresponding holding elements (not shown). has been done.

FIG. 3 shows a schematic plan view of the bottom roller groups 21u, 22u, 23u of the draft section 10 of the ring spinning frame 1.

As already suggested in the foregoing description, these bottom roller groups 21u, 22u, 23u each consist of a plurality of roller segments 34, 48, etc., which are connected to each other in a manner that cannot rotate relative to each other. The bottom roller groups 21u, 22u, 23u are supported by a roller stand 9 at regular intervals, and are connected to an electric motor 28 disposed on the machine entrance side and supplied with energy from a power supply network 44, for example, and a deceleration motor 28. It is rotated by a drive 27 having a transmission 29 . In other words, the bottom roller groups 21u, 22u, 23u are connected to one another in a positive and frictional manner by means of a speed change gear of the reduction gear 29.

In this embodiment, another drive device 46 is further arranged on the opposite side of the ring spinning frame 1 from the drive device 27, and the transmission device 37 of this drive device 46 is also provided with the bottom roller groups 21u, 22u. , 23u.

The transmission device 37 is adapted to ensure that the rotational speeds of the bottom roller groups 21u, 22u, and 23u are accurately adjusted and maintained relative to one another, and as indicated, the transmission device 37 can also be provided with driving force by an electric motor 47.

The bottom roller groups 21u, 22u, 23u are further provided with a length compensation device 31 configured according to the present invention in the region of approximately the machine center 30 of the ring spinning machine 1. That is, the length compensation device 31 is configured and arranged so that both torque transmission and thermal length compensation are possible for the bottom roller groups 21u, 22u, 23u.

A precise embodiment of a length compensation device 31 constructed according to the invention will be explained in more detail below with reference to FIGS. 4, 5 and 6.

FIG. 4 shows a slightly oblique perspective view of an intermediate portion of the bottom roller group 21u of the draft section 10 of the ring spinning frame 1.

As is known, such a bottom roller group 21u consists of a number of roller segments that are connected to each other before being assembled so that they cannot rotate relative to each other. A bottom roller group 21u of this kind has, for example, as shown in Figures 3 to 6, in particular central roller segments 34, 48, between which a length compensation device 31 is assembled, which is configured as follows according to the present invention.

In an advantageous embodiment, the length compensating device 31 consists of a compensating shaft 38, a bearing sleeve 39, a bottom roller bearing 42 and a connecting member 43, as can be seen in particular from FIG. The compensation shaft 38 has a so-called P4C polygonal profile and is preferably surface hardened, and is fixed in the installed state in a bearing sleeve 39, which itself has a bottom roller. It is rotatably positioned in a bearing 42 , the bottom roller bearing 42 being supported on a roller stand 9 which is preferably arranged in the region of approximately the machine center 30 of the ring spinning frame 1 .

In the assembled state shown in FIG. 6, the compensation shaft 38 is connected to a connecting element 43 which is itself mounted, for example by press-fitting, in the roller segments 34, 48. That is, the connecting elements 43 each have a preferably likewise surface-hardened central holding part 49, which allows the connecting elements 43 and thus the roller segments 34, 48 to slide axially on the compensating shaft 38. The P4C polygonal profile of the compensation axis 38 is adapted and adjusted as possible.

Such an axial sliding of the connecting member 43 on the compensation shaft 38 occurs, inter alia, whenever a heat-induced length expansion of the bottom roller group 21u, 22u, 23u occurs. Moreover, at the same time, the P4C polygonal profile is able to transmit relatively large torques without problems, so that the operation of the ring spinning frame is not disturbed by such a length expansion of the bottom roller group 21u, 22u, 23u. There isn't.

As already explained, in the case of the P4C polygonal profile, no notch effect occurs during torque transmission, so the P4C polygonal profile has a 30% higher fatigue strength than the conventional spline shaft profile.

1 Ring spinning machine 2 Frame 3 Stand pipe body 4 Suction duct 5 Bridge member 6 Support tube 7 Spindle for ring spinning 8 Spinning cop 9 Roller stand 10 Draft section 11 Support tube 12 Roving material 13 Support column 14 Roving material creel 15 Roughing Thread bobbin 16 Holding rod 17 Load arm 18 Ring rail 19 Balloon control ring 20 Thread guide 21u Bottom roller group 21o Top roller 22u Bottom roller group 22o Top roller 23u Bottom roller group 23o Top roller 24 Direction rod 25 Movement mechanism 26 Swing carrier 27 Drive device 28 Electric motor 29 Reduction transmission device 30 Machine center 31 Length compensator 32 Arm 33 Bobbin change device 34 Roller segment 35 Reserve draft area 36 Main draft area 37 Transmission device 38 Compensation shaft 39 Bearing sleeve 40 Structured part 41 Slider 42 Bottom roller bearing 43 Connection member 44 Power supply network 45 Support body 46 Drive device 47 Electric motor 48 Roller segment 49 Holding section

Claims (6)

A ring spinning machine (1) having a draft section (10),
The draft portion (10) is formed by a pair of rollers (21, 22, 23), and the pair of rollers (21, 22, 23) rotate at different rotational speeds and extend in the machine length direction. It has a bottom roller group (21u, 22u, 23u), the bottom roller group (21u, 22u, 23u) is formed by roller segments (34, 48), and the bottom roller group (21u, 22u, 23u) In a ring spinning machine (1), each of which is equipped with a length compensator (31),
The length compensation device (31) incorporated in the bottom roller group (21u, 22u, 23u) is capable of both length compensation and torque transmission with respect to the bottom roller group (21u, 22u, 23u), respectively. constructed and arranged so that
The length compensator (31) has a compensation shaft (38) having a P4C polygonal profile and a holding part (49), and the compensation shaft (38) and the holding part (49) are form-connected. form the shaft hub joint of the formula,
In the state where the compensation shaft (38) and the holding part (49) are coupled, the roller segments (34, 48) of the bottom roller group (21u, 22u, 23u) are connected to the holding part (49), respectively. A ring spinning frame (1), characterized in that it is axially slidably connected to said compensation shaft (38) via a ring. 2. The ring spinning machine (1) according to claim 1 , characterized in that the compensation shaft (38) is rotatably supported in a bottom roller bearing (42) via a bearing sleeve (39). 3. The roller segment (34, 48) of the bottom roller group (21u, 22u, 23u) each has a connecting member (43) that includes the holding part (49) . ring spinning machine (1). Each of the connecting members (43) is relatively unrotatably attached to one of the roller segments (34, 48) of the bottom roller group (21u, 22u, 23u) by press-fitting. The ring spinning machine (1) according to claim 3 , wherein the ring spinning machine (1) is 3. The bottom roller bearing (42) is supported on a roller stand (9) arranged approximately in the region of the machine center (30) of the ring spinning frame ( 1 ). ring spinning machine (1). The bottom roller bearing (42) can be inserted from above into the bottom roller bearing (42) in which a bearing sleeve (39) on which the compensation shaft (38) is attached can be opened, and the bottom roller bearing (42) Ring spinning frame (1) according to claim 2 , characterized in that it is configured to be lockable within ).