Pneumatic system for doffing system of ring spinning machine, method for operating doffing system, and doffing system

Abstract

The present invention relates to a pneumatic system for a doffing system of a ring spinning machine (RMS), wherein the doffing system comprises two doffing beams, a plurality of grippers, and doffing motors for raising and lowering the doffing beams, the pneumatic system is divided into at least four sections for supplying compressed air to the grippers, and further comprises a hose and / or tube and / or passage system to a pneumatic cylinder enabling lateral inward and outward rotation of at least one doffing beam of the doffing system, the pneumatic system comprises a main air supply unit, the main air supply unit is connected to first and second main air connection lines (MACs), the first MAC is positioned to pass through a main pneumatic panel (PP) of the RMS located at the outside end of the RMS, and the first MAC is controlled by the PP.

Description

Technical Field

[0001] Field of the Invention The present invention is positioned in the field of doffing for ring spinning machines, and relates to a pneumatic system for a doffing system, a doffing system provided with such a pneumatic system, and a method for operating such a doffing system.

[0002] Technical Background Based on the state of the art, it is known to operate doffing systems in ring spinning machines by means of a pneumatic system in combination with a doffer motor and / or another mechanism (for example, a spring mechanism).

[0003] In doffing systems used in modern spinning mills, the pneumatic system has a single compressed air inlet, which supplies compressed air to two sections or two pneumatic systems of the doffing system located on either side of the ring spinning machine (each on one side of the ring spinning machine). Based on this, a partial two-pneumatic system may include, for example, a single solenoid valve, a set of quick-release discharge valves or additional solenoid valves for the motion of rotating the doffing beam inward and outward, and a single solenoid valve for inflating and deflating the grippers, these valves located on the doffing beam. Multiple grippers are arranged on this doffing beam, and these grippers are inflated and deflated to grip full cups (winding tubes on which the spinning yarn is wound) and empty tubes. The doffing beam is designed so that it can rotate outward and inward by the operation of a pneumatic cylinder. These cylinders are typically located every other section, every two sections, or every three sections in a so-called mechanical section (for example, a double-sided ring spinning machine with a total of 1824 working units, each side having 24 working units). These pneumatic cylinders perform vertical motion, which is converted into lateral rotational motion of the doffer beam. The doffer beam extends along one side of the ring spinning machine. The doffer beam is formed from a single aluminum profile up to approximately 70 m in length, or from a certain number of shorter aluminum profiles (e.g., 14 x 5 m profiles) connected to one another. In cases where the ring spinning machine has an intermediate drive mechanism, the doffer beam may be divided and extend along one side of the ring spinning machine, for example, half of it.

[0004] Because the doffer beam or profile extends along the entire length of the machine, a large volume is defined to be filled by the pressure that causes the grippers positioned on the doffer beam to expand and / or contract. Therefore, filling the air passages provided in the profile specifically for the grippers of the doffer takes time.

[0005] The pneumatic cylinders for rotating the doffer beam inward and outward are positioned along the entire length of the machine, and it takes a long time to ensure a sufficient supply of compressed air.

[0006] Since doffing time significantly impacts the overall productivity of spinning machines, the field of technology is constantly striving to provide solutions for reducing doffing time.

[0007] Description of the Invention The object of the present invention is to reduce doffing time, which is achieved by a pneumatic system for a doffing machine as described in independent claim 1, a doffing system comprising such a pneumatic system as described in a further independent claim, and a method for operating such a doffing system. Advantageous embodiments of the present invention are described in the dependent claims.

[0008] The essence of the present invention lies in a pneumatic system for a doffing system of a ring spinning machine, the doffing system comprising at least two doffing beams, a plurality of grippers arranged on the at least two doffing beams, and a doffing motor for raising and lowering the doffing beams vertically, wherein the pneumatic system for the doffing system is divided into at least four sections, each comprising a hose and / or tube and / or passage system for supplying compressed air to and from the grippers of the doffing system. Furthermore, the pneumatic system comprises a hose and / or tube and / or passage system to and from a pneumatic cylinder, the pneumatic cylinder facilitating lateral inward and outward rotation of at least one doffing beam of the doffing system (= inward / outward rotation mechanism). The pneumatic system further includes a main air supply unit, which is connected to first and second main air connection passages, the first main air connection passage being positioned to pass through the main pneumatic panel of the ring spinning machine located at the outside end of the ring spinning machine, and the first main air connection passage is controlled by the main pneumatic panel.

[0009] The doffing system within the scope of the present invention is a general doffing system used in a spinning mill, and its role is to remove a full cup from a ring spinning machine, more precisely from a spindle, and replace this full cup with an empty tube delivered by several types of conveying systems (which will, for example, transport the full cup to a downstream winder). The doffing system comprises at least two doffing beams, each of which is at least one on each side of the machine, and a plurality of grippers arranged on these at least two doffing beams. These grippers may be detachably arranged. The grippers are connected to the doffing beams, which are provided with perforation holes / openings in each hose / tube or passage of the doffing beam, thereby allowing compressed air to flow into the grippers (more precisely, the membranes of the grippers). Furthermore, the doffing system comprises a doffing motor for raising and lowering the doffing beams or the structures supporting the doffing beams in the vertical direction. This motor is located at the gear end of the ring spinning machine, that is, the end opposite the outer end of the ring spinning machine, and performs a horizontal motion, which generates a vertical moment in the doffer beam structure.

[0010] As already mentioned, in most cases the doffing beam extends along the entire length of the machine. In only a few cases the doffing beam is split in the middle of the ring spinning machine, resulting in four doffing beams.

[0011] The doffer beam itself is fabricated from an aluminum profile, which forms passages for accommodating, for example, electrical wires / cables and hoses / tubes or passages for compressed air supply. These passages provide perforations / openings that can be airtightly closed for compressed air supply. Compressed air is introduced into the doffer beam from one of the first and second main air connection passages at the out end of the ring spinning machine (described below) or in the middle of the ring spinning machine, controlled by an intermediate drive unit of the ring spinning machine.

[0012] Within the scope of this invention, the pneumatic system refers to all mechanical parts that come into contact with the compressed air portion, which is specifically designed to produce the motion of the doffing system, including the expansion and contraction of the gripper. The pneumatic system extends from the so-called out-end of the ring spinning machine (the mechanical part that houses the control panel, main pneumatic panel, monitor, UID, and more) through hoses / tubes and / or passages having perforations / openings in the aluminum doffer profiles for compressed air supply to the gripper, or through hoses / tubes to the pneumatic cylinders of the doffer beam (for the inward and outward rotation mechanism for rotating the doffer beam inward and outward). The pneumatic system includes various types of valves, pressure regulators and pressure switches, barometers, quick-release valves and solenoid valves for monitoring the gripper, pneumatic cylinders, etc.

[0013] The pneumatic system of the doffing system is divided into four sections. Each section comprises a hose and / or tube and / or passage system for supplying compressed air to the gripper of the doffing system and for discharging it from the gripper. Within the scope of the present invention, such division of the pneumatic system of the doffing system does not necessarily result in a physical division of the doffing system, e.g., a doffing beam or a ring spinning machine; rather, the system is divided into supply level and / or drive level and / or control and adjustment level.

[0014] According to the present invention, the pneumatic system comprises a main air supply unit and two main air connection passages, a first and a second, connected to the main air supply unit via a T-shaped connection passage. At least one of these main air connection passages (e.g., the first main air connection passage) is arranged to pass through the main pneumatic panel of the ring spinning machine, located at the outside end of the ring spinning machine. This main air connection passage (e.g., the first main air connection passage) is controlled by the main pneumatic panel. For example, the first main air connection passage is provided to supply grippers in at least two sections of the doffering system's pneumatic system (preferably two sections located near / adjacent to the outside end of the ring spinning machine), and further supplies hoses / tubes and / or passages assigned to the pneumatic cylinders of the inward / outward swivel mechanism of the doffering system for the entire ring spinning machine, and supplies further systems, such as a draft system, a drum separator, and supplies for rappet motion.

[0015] The main pneumatic panel is located at the outside of the ring spinning machine and is designed to control not only the supply to the grippers of at least two sections of the doffering system, but also the supply to the hoses / tubes and / or passages assigned to the pneumatic cylinders of the inward / outward swivel mechanism of the doffering system for the entire ring spinning machine, as well as the supply to further systems, such as the draft system, the drum separator, and the supply for the lappet motion. In addition, the main pneumatic panel (and auxiliary pneumatic panel) of the ring spinning machine is equipped with various valves, control valves, barometers, etc.

[0016] The presence of first and second main air connection passages via a T-shaped connection passage, starting from the main air supply unit, and the arrangement according to the present invention, namely, the first main air connection passage is positioned to pass through the main pneumatic panel of the ring spinning machine, and each second main air connection passage extends in the opposite direction rather than passing through the main pneumatic panel (allowing compressed air to flow in the opposite direction to the first main connection passage) (see general function of the T-shaped connection passage), and according to a preferred embodiment of the present invention, passes through an auxiliary pneumatic panel located in the intermediate drive unit of the ring spinning machine. This arrangement provides a remarkably rapid supply of compressed air to the grippers located in each section of the pneumatic system of the doffering system or in the doffer beam, because the compressed air is supplied through these two main air connection passages / two paths of compressed air. A predetermined required pressure is achieved in a shorter time, and as a result, for example, the grippers are inflated more quickly.

[0017] Similarly, the release of compressed air and, for example, the contraction of the gripper are achieved. As a result, the overall doffing time is reduced. Combined with additional adjustments as described below, the overall doffing time can be reduced even further. Reducing the doffing time improves the overall productivity of the ring spinning machine and increases the feed rate to the downstream winder.

[0018] According to a preferred embodiment, the second main air connection path of the pneumatic system is arranged to pass through an auxiliary pneumatic panel located in the intermediate drive unit of the ring spinning machine. The second main air connection path passes through an auxiliary pneumatic panel located in the intermediate drive unit of the ring spinning machine, which controls the compressed air supply for the grippers of two sections of the pneumatic system of the doffing system located near the gear end of the ring spinning machine, rather than through the main pneumatic panel, thus significantly reducing the time required to inflate and deflate the grippers. As a result of the direct compressed air supply, the supply is faster compared to compressed air supply through a single main air connection path that passes through the main control panel of the ring spinning machine, as used in conventional ring spinning machines, and consequently, the predetermined pressure is achieved more quickly.

[0019] Preferably, each of the first and second main air connection passages of the pneumatic system is connected to at least one section of the pneumatic system section of the doffing system.

[0020] Advantageously, the first main air connection passage is positioned to supply compressed air to the third and fourth sections of the pneumatic system of the doffing system. The third and fourth sections of the pneumatic system of the doffing system are two sections located close to the outside end of the ring spinning machine. The first main air connection passage is a main air connection passage that passes through the main control panel of the ring spinning machine and further supplies compressed air to the third and fourth sections of the pneumatic system of the doffing system, and also supplies air to the pneumatic cylinders of the inward / outward rotation mechanism of the doffing beam of the entire ring spinning machine.

[0021] Advantageously, the second main air connection passage is positioned to supply compressed air to the first and second sections of the pneumatic system of the doffing system. The second main air connection passage passes through the auxiliary pneumatic panel of the intermediate drive unit of the ring spinning machine and exclusively supplies compressed air to the grippers of the first and second sections of the pneumatic system of the doffing system.

[0022] According to an advantageous embodiment of the present invention, a first main air connection passage is arranged to supply compressed air to a pneumatic cylinder. As a result of this arrangement, the overall doffing time is made faster. The first main air connection passage supplies compressed air to two sections of the pneumatic system of the doffing system, in particular to the pneumatic cylinders of the inward / outward swivel mechanism, in order to inflate (or deflate) the gripper closest to the out end of the ring spinning machine (enabling the lateral inward and outward swivel (rotation) of at least one doffing beam of the doffing system). The remaining two sections of the pneumatic system of the doffing system are located closer to the gear end of the ring spinning machine, i.e., further away from the main air supply section, so that the compressed air to inflate (and deflate) the grippers in those sections must travel an additional distance, which consumes time. Therefore, a faster supply of compressed air is provided by an additional second main air connection passage that supplies the pneumatic system of the doffing system to those two sections.

[0023] According to an advantageous embodiment of the present invention, the compressed air supply section for supplying and releasing compressed air to and from the grippers of the doffing system from the first and second main air supply connection passages of each section of the doffing system's pneumatic system is controlled by four solenoid valves. In pneumatic systems used to date, only one solenoid valve controls the expansion and contraction of the grippers. By using four solenoid valves, faster air supply and release are possible because the valves are located closer to each gripper. Furthermore, by using solenoid valves in each of the four sections of the doffing system's pneumatic system, direct control and rapid opening and closing, and thus faster supply of compressed air to each section, are possible. The solenoid valves are located, for example, in the main pneumatic panel and the auxiliary panel.

[0024] According to an advantageous embodiment of the present invention, the pneumatic system of the doffing system is provided with four additional quick-release valves R1, R2, R3, R4 for multiple pneumatic cylinders of the doffing inward / outward rotation mechanism. The pneumatic cylinders of the doffing inward / outward rotation mechanism are connected to the structure of the doffing beam, so that the vertical motion of the cylinder coils is converted into lateral inward and / or outward rotational motion of the doffing beam. The four additional quick-release valves adjacent to the quick-release valves used in conventional ring spinning machines or conventional doffing systems of ring spinning machines result in even faster compressed air supply / release.

[0025] The essence of the present invention is a doffing system comprising at least two doffing beams, a plurality of grippers arranged on the at least two doffing beams, and a doffing motor for moving the doffing beams in a vertical direction, wherein the doffing system further comprises a pneumatic system according to the present invention, a controller for controlling the speed of the doffing motor, and a solenoid valve provided in the pneumatic system. The controller is located at the out end of the ring spinning machine or elsewhere on the ring spinning machine and controls the solenoid valve (opening and closing) and the doffing motor, thereby ensuring that all these processes are carried out at the appropriate time, in the appropriate mode, etc.

[0026] The present invention further relates to a method for operating a doffing system according to the present invention, which may be performed in different orders and is controlled by a controller. A method for supplying compressed air to at least four sections of the pneumatic system of a doffing system through a main air supply unit and first and second main air connection paths, • A method for raising and lowering a doffer beam vertically using a doffer motor, and A method for rotating a doffer beam inward by supplying compressed air to the doffer beam's pneumatic cylinder, · a method step of pivoting the doffer beam outward by discharging compressed air from the pneumatic cylinder via at least four additional quick-release valves; · a method step of inflating grippers arranged on at least two doffer beams by supplying compressed air via at least four solenoid valves; · a method step of deflating the grippers arranged on at least two doffer beams by discharging compressed air via at least four solenoid valves, the method comprising the same.

[0027] An exemplary sequence of the method according to the present invention is described below: supplying compressed air to the pneumatic cylinder of the doffer beam of the doffing system to pivot the doffer beam outward in the lateral direction; raising the doffer beam vertically from the lower standby position by the doffer motor to reach the upper standby position; discharging compressed air from the pneumatic cylinder of the doffer beam of the doffing system through an additional quick-release valve, in particular a valve for pivoting the doffer beam inward; lowering the doffer beam from the upper standby position by the doffer motor to reach the first gripping position; supplying compressed air via at least four solenoid valves to inflate the grippers, thereby gripping the full cop on the spindle; raising the doffer beam vertically from the first gripping position by the doffer motor to reach the upper standby position; supplying compressed air to the pneumatic cylinder of the doffer beam of the doffing system to pivot the doffer beam outward; lowering the doffer beam from the upper standby position by the doffer motor to reach the lower standby position; discharging compressed air from the pneumatic cylinder of the doffer beam of the doffing system through an additional quick-release valve, in particular a valve for pivoting the doffer beam inward; The doffer beam is lowered from its lower standby position by the doffer motor and brought to the release position; The gripper is contracted by releasing compressed air through at least four solenoid valves, thereby releasing the full cup, for example, by rotation, and thereby freeing the full cup in Rieter's SERVOdisc or any other full cup / empty tube conveying system that delivers empty tubes; The gripper is inflated by supplying compressed air through at least four solenoid valves, thereby gripping the empty tube; The doffer beam is raised vertically from the release position by the doffer motor to the standby position; Compressed air is supplied to the pneumatic cylinder of the doffer beam of the doffer system, causing the doffer beam to rotate outward; The doffer beam is raised vertically from the lower standby position by the doffer motor and brought to the upper standby position; Compressed air is released from the pneumatic cylinder of the doffer beam of the doffering system through an additional quick-release valve, in particular, a valve for rotating the doffer beam inward; The doffer beam is lowered vertically from the upper standby position to the first gripping position by the doffer motor; The gripper is retracted and the empty tube is positioned on the spindle by releasing compressed air through at least four solenoid valves; The doffer beam is raised vertically from the first gripping position by the doffer motor to reach the upper standby position; Compressed air is supplied to the pneumatic cylinder of the doffer beam of the doffer system, causing the doffer beam to rotate outward; The doffer beam is lowered vertically from the upper standby position to the lower standby position by the doffer motor.

[0028] This illustrates the very basic sequence of method steps carried out by the present invention. As already stated, the sequence may be changed, for the basic method steps remain the same: expansion and contraction of the gripper, raising and lowering of the doffer beam, inward rotation and outward rotation of the doffer beam.

[0029] The controller controls the process step by matching the speed of the motor doffer to the expansion / contraction speed of the gripper and the inward and outward rotation speeds of the doffer beam. Preferably, the speed of the doffer motor is increased by 1-20%, preferably 5-12%, and more preferably 10%, of the speed used in a standard doffering system. This is done / controlled to keep up with / follow the shorter doffering time resulting from the faster supply of compressed air provided by the pneumatic system according to the present invention.

[0030] When all three actions are accelerated using the doffing system or pneumatic system according to the present invention, the doffing time can be reduced by up to 30%. This reduction in doffing time improves the overall productivity of the ring spinning machine and allows for continued beneficial upgrades to the pneumatic system as disclosed in the present invention (additional compressed air inlet, additional solenoid valve, additional quick-release valve, and increased doffing motor speed). [Brief explanation of the drawing]

[0031] [Figure 1] To facilitate understanding of the present invention, this diagram schematically shows an assembly of a pneumatic system according to the state of the art. [Figure 2] This figure schematically shows an assembly of the pneumatic system according to the present invention. [Figure 3] This diagram schematically shows a portion of a conventional ring spinning unit equipped with a doffing system. [Figure 4]This diagram schematically shows an example of a quick-release valve assembly for the inward / outward rotation mechanism of a doffer beam.

[0032] Figure 1 shows a schematic overall assembly of a pneumatic system or pneumatic circuit according to the level of technology. It shows the pneumatic system of a doffing system 3 for a double-ended ring spinning machine with an out-end 1 and a gear end 1. The main air connection passage 4 extends to both sides of the doffing system 3 from a single solenoid valve located on a pneumatic panel, for example, on the out-end 1 of the ring spinning machine, supplying compressed air to, for example, a doffer beam and the pneumatic cylinder of this doffer beam. For the expansion and contraction of, for example, the gripper in the double-ended doffing system, the compressed air supply is controlled by a single solenoid valve. Compressed air flows entirely from the out-end 1 of the ring spinning machine through perforated passages in the profile of the doffer beam (usually made from aluminum) to the gear end 2 to expand the gripper. For the contraction of the gripper, compressed air flows entirely from the gear end 2 to the out-end 1. This is indicated by dotted arrows in Figure 1. A ring spinning machine may have, for example, 1824 spinning units, so the path for compressed air from out end 1 to gear end 2, and vice versa, may be up to 70m or even more. As a result, the volume of compressed air required to achieve a predetermined pressure is large, which consumes time.

[0033] Figure 2 shows an overall assembly of a pneumatic system according to an embodiment of the present invention. Figure 2 also shows a pneumatic system of doffing system 3 for a double-sided ring spinning machine. However, this pneumatic system 3 is divided into four sections, and this division does not necessarily result in a physical division of the doffing system or the ring spinning machine; rather, the system is divided into supply level and / or drive level and / or control and adjustment level. Thus, the doffing beam may, for example, still extend along all sides of a double-sided ring spinning machine. In cases where the ring spinning machine has an intermediate drive unit in the middle of the ring spinning machine, the pneumatic system of doffing system 3 is divided into four sections Q1, Q2, Q3, and Q4 accordingly. The doffing beam comprises a profile made of, for example, aluminum, which comprises at least passages having perforations / openings for supplying compressed air to the gripper. The doffer beams assigned to the third and fourth sections Q3 and Q4 of the pneumatic system are connected to a first main air connection path M1 that starts from the main air supply unit M of the ring spinning machine and passes through the main pneumatic panel PP. This first main air connection path M1 is controlled by solenoid valves V3 and V4, in which case V3 is assigned to section Q3 of the pneumatic system and V4 is assigned to section Q4 of the pneumatic system. The solenoid valves may be located on the main pneumatic panel PP. The main air connection path M2 is assigned to the doffer beams of the first and second sections Q1 and Q2 of the pneumatic system and starts from the main air supply unit M located within the spinning machine. The second main air connection path M2 is controlled by solenoid valves V1 and V2, in which case V1 is assigned to section Q1 of the pneumatic system and V2 is assigned to section Q2 of the pneumatic system. The solenoid valves V1 and V2 may be located on the auxiliary pneumatic panel of the intermediate drive unit.

[0034] Compressed air flows from the main air supply unit M and is divided into first and second main air connection passages M1 and M2 via a T-shaped connection passage, and then flows in two directions: one direction through the first main air connection passage M1 through the main pneumatic panel PP toward sections Q3 and Q4 of the pneumatic system and reaching the pneumatic cylinders of the inward / outward rotation mechanism of the entire ring spinning machine, and the other direction through the second main air connection passage M2 through an auxiliary pneumatic panel (not shown) toward sections Q1 and Q2 of the pneumatic system.

[0035] As a result of this configuration, compared to a pneumatic system of the technical level shown in Figure 1, compressed air distribution is faster, and the volume that needs to be filled in each main air connection channel M1, M2 to reach a predetermined pressure is achieved significantly more quickly. This time saving outweighs the additional configuration cost of a second main air connection channel and an additional solenoid valve.

[0036] The arrows extending from the outer end 1 of the ring spinning machine indicate the compressed air flow, which is divided into four sections Q1, Q2, Q3, and Q4 of the pneumatic system by controlling solenoid valves V1, V2, V3, and V4. The dashed arrows indicate the compressed air flow within the four sections Q1, Q2, Q3, and Q4 of the pneumatic system, showing that the volume that must be filled with compressed air and / or emptied is significantly smaller than that of exemplary embodiments of the art shown in Figure 1.

[0037] Figure 3 shows a portion of a conventional ring spinning unit equipped with a doffering system. Only the main components are described to illustrate the basic function of the doffering system 3. The doffer beam 05 is formed from an aluminum profile and is equipped with a passage for compressed air. A gripper 02 is attached to the doffer beam 05 so as to be able to inflate and deflate, for example, the membrane of the doffer gripper 02, for gripping and releasing the full cup 06 or empty tube 08 from the spindle 07 or from the conveying system 09 for the full cup 06 and empty tube 08, using compressed air. The doffer beam 05 may be raised and lowered by a structure 01 driven by a doffer motor (not shown) located at at least one end of the ring spinning machine on each side of the ring spinning machine. The doffering system 3 is equipped with a swivel system for the doffer beam 05. This system allows the doffer beam 05 to swivel inward and outward. The inward / outward rotation mechanism for the doffer beam 05 is actuated by a pneumatic cylinder 04. This system enables at least the following actions of the doffer beam 05: To raise and lower the Doffa beam 05 in the vertical direction, To rotate the Doffa Beam 05 inward and outward, Inflating and deflating Gripper 02 This will make it possible to implement this.

[0038] Figure 4 shows a quick-release valve assembly for the inward / outward rotation mechanism of a doffer beam. The inward / outward rotation mechanism comprises a doffer beam that is moved / rotated laterally away from the ring spinning machine. This is accomplished by the extension and contraction of several pneumatic cylinders (PCs) connected to the doffer beam structure included in the inward / outward rotation mechanism. These pneumatic cylinders (PCs) perform vertical motion (extension and contraction), which is converted into lateral rotational motion of the doffer beam by the structure of the inward / outward rotation mechanism. In cases where the doffer beam may be divided into two or more parts, it extends along one side of the ring spinning machine. The pneumatic cylinders (PCs) are, for example, located every 1 / 6 of the ring spinning machine and are supplied via four quick-release valves EV1, EV2, EV3, EV4. According to the present invention, four additional quick-release valves AV1, AV2, AV3, and AV4 are provided, and depending on the embodiment, even more quick-release valves may be provided. As a result of this configuration, compressed air supply / release becomes faster, and a faster overall doffing time is achieved.

Claims

1. A pneumatic system for a doffing system of a ring spinning machine, the doffing system comprising at least two doffing beams (05), a plurality of grippers 02 arranged on the at least two doffing beams (05), and a doffing motor for raising and lowering the doffing beams (05) in the vertical direction. The pneumatic system of the doffing system is divided into at least four sections (Q1, Q2, Q3, Q4), each comprising a hose and / or tube and / or passage system for supplying compressed air to and from the gripper (02) of the doffing system, Furthermore, the pneumatic system comprises a hose and / or tube and / or passage system to and from a pneumatic cylinder (PC), the pneumatic cylinder (PC) enabling lateral inward and outward rotation of at least one of the doffing beams (05) of the doffing system, the pneumatic system comprises a main air supply unit (M), the main air supply unit (M) is connected to first and second main air connection passages (M1, M2), the first main air connection passage (M1) is arranged to pass through the main pneumatic panel (PP) of the ring spinning machine located at the out end (1) of the ring spinning machine, and the first main air connection passage (M1) is controlled by the main pneumatic panel (PP). Pneumatic system.

2. The pneumatic system according to claim 1, wherein the second main air connection passage (M2) is arranged to pass through an auxiliary pneumatic panel located in the intermediate drive unit of the ring spinning machine.

3. The pneumatic system according to claim 1 or 2, wherein each of the main air connection passages (M1, M2) is connected to at least one of the sections (Q1, Q2, Q3, Q4) of the pneumatic system of the doffing system.

4. The pneumatic system according to claim 3, wherein the first main air connection passage (M1) is arranged to supply compressed air to the third and fourth sections (Q3, Q4) of the pneumatic system of the doffing system.

5. The pneumatic system according to claim 3 or 4, wherein the second main air connection passage (M2) is arranged to supply compressed air to the first and second sections (Q1, Q2) of the pneumatic system of the doffing system.

6. The pneumatic system according to any one of claims 1 to 5, wherein the first main air connection passage (M1) is arranged to supply compressed air to the pneumatic cylinder (PC).

7. The pneumatic system according to any one of claims 1 to 6, wherein the compressed air supply section for supplying and releasing compressed air from the main air connection passages (M1, M2) of each section (Q1, Q2, Q3, Q4) of the pneumatic system of the doffing system to the gripper (02) of the doffing system is controlled by four solenoid valves (V1, V2, V3, V4).

8. The pneumatic system according to any one of claims 1 to 7, wherein the pneumatic system of the doffing system is provided with four additional quick-release valves (R1, R2, R3, R4) for a plurality of pneumatic cylinders (PCs) of the doffing inward / outward rotation mechanism.

9. A doffing system comprising at least two doffing beams, a plurality of grippers (02) arranged on the at least two doffing beams (05), and a doffing motor for moving the doffing beams (05) in a vertical direction, wherein the doffing system further comprises a pneumatic system according to any one of claims 1 to 8, a controller for controlling the speed of the doffing motor, and solenoid valves (V1, V2, V3, V4) and quick-release valves (R1, R2, R3, R4) provided in the pneumatic system.

10. A method for operating the doffing system according to claim 9, which may be performed in different orders and is controlled by the controller, A method for supplying compressed air to at least four sections (Q1, Q2, Q3, Q4) of the pneumatic system of the doffing system through the main air supply unit (M) and two main air connection passages (M1, M2), A method step of raising and lowering the doffer beam (05) in the vertical direction by the doffer motor, A method step of rotating the doffer beam (05) inward by supplying compressed air to the pneumatic cylinder (PC) of the doffer beam (05), A method step of rotating the doffer beam (05) outward by releasing compressed air through at least four quick-release discharge valves (R1, R2, R3, R4), A method step of inflating the grippers (02) positioned on the at least two doffer beams (05) by supplying compressed air through at least four solenoid valves (V1, V2, V3, V4), A method step of contracting the grippers (02) positioned on the at least two doffer beams (05) by releasing compressed air through the at least four solenoid valves (V1, V2, V3, V4) Methods that include...

11. The method according to claim 10, wherein the speed of the doffer motor is increased by 1 to 20%, preferably 5 to 12%, and more preferably 10%, of the speed used in a standard doffering system.

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