CN220998556U - Storage winding mechanism of laminating machine - Google Patents

Abstract

Storage winding mechanism of laminating machine: comprises a winding device, a winding adjusting device and a material storage device; one end of the adjusting rod is hinged to the first bracket, a winding press roller is arranged at the other end of the adjusting rod and is positioned above the winding device, the cylinder body end of the first driving cylinder is hinged to the first bracket, and the telescopic rod end of the first driving cylinder is rotatably connected to the middle part of the adjusting rod; the tail end of a rotating shaft of the winding press roller is connected with a first sprocket, a first speed reducing motor is further arranged on the adjusting rod, an output shaft of the first speed reducing motor is connected with a second sprocket in a transmission manner, and the first sprocket and the second sprocket are matched through a chain; the first guide roller, the second guide roller and the third guide roller are sequentially arranged on the adjusting rod in a staggered mode. The material storage winding mechanism has the advantages that the adjustable range of the material storage device is large, and the structure is stable and reliable; the optimal winding angle can be ensured, so that the winding is stable; the coiled material can be compacted, so that the cloth is tightly wound; the cloth can keep good tension and flatness, so that the winding material is more compact and has no wrinkles.

Description

Storage winding mechanism of laminating machine

Technical Field

The utility model belongs to the field of film coating machines, and particularly relates to a storage winding mechanism of a film coating machine.

Background

The film coating machine is also called an extrusion compound machine, a casting machine, an extrusion casting machine, a casting compound machine, a film coating machine and a plastic coating machine, is one of extrusion molding machines, is widely used in modern industrial production, is used for coating paper, cloth and other base materials, and has the advantages of high automation degree, simple and convenient operation, high production speed, uniform coating thickness and the like.

The storage winding mechanism of the existing laminating machine is simple in structure, and particularly for the flax laminating machine, when cloth is rolled, the phenomena of unsmooth compaction, unstable rolling, wrinkling of the coiled material and the like exist due to thicker cloth thickness, so that the storage winding mechanism of another laminating machine is needed to solve the problems.

Disclosure of utility model

Based on the content in the background technology, the utility model provides a material storage rolling mechanism of a film coating machine, which comprises a rolling device, a rolling adjusting device and a material storage device, wherein the rolling adjusting device is arranged between the rolling device and the material storage device through a first bracket;

The rolling device is in the prior art, the coiled material rolling device is equipment widely applied to industrial workshops and is used for rolling coiled materials, the coiled material rolling device is generally composed of a frame, a driving wheel, a guide wheel, a braking device, an electronic control system and the like, the production efficiency can be improved, the manpower input is reduced, the production cost is reduced, and the specific structure is not repeated;

The winding adjusting device comprises an adjusting rod, a winding press roller, a first driving cylinder, a first sprocket, a first speed reducing motor, a second sprocket, a chain, a first guide roller, a second guide roller and a third guide roller;

One end of the adjusting rod is hinged to the first bracket, a winding press roller is arranged at the other end of the adjusting rod and is positioned above the winding device, the cylinder body end of the first driving cylinder is hinged to the first bracket, the telescopic rod end of the first driving cylinder is rotatably connected to the middle part of the adjusting rod, the first driving cylinder is specifically a cylinder or a hydraulic cylinder, and under the driving of the first driving cylinder, one end of the adjusting rod, provided with the winding press roller, can swing up and down, so that the pressing force of the winding press roller on winding cloth can be adjusted at any time, coiled materials are compacted, and the cloth is tightly wound;

The end of the rotating shaft of the rolling press roller is connected with a first sprocket, the adjusting rod is also provided with a first speed reducing motor, the output shaft of the first speed reducing motor is connected with a second sprocket in a transmission way, the first sprocket and the second sprocket are matched through a chain, the rolling press roller can rotate under the driving of the first speed reducing motor, the rotating direction of the rolling press roller is opposite to the rolling direction of the rolling device, good tension and flatness of cloth can be kept under the extrusion of the rolling press roller, and the rolling material is more compact and has no wrinkles;

The first guide roller, the second guide roller and the third guide roller are sequentially arranged on the adjusting rod in a staggered mode, cloth from the storage device is guided by the plurality of guide rollers, so that the cloth can be wound on the winding roller of the winding device after being contacted with the surface of the winding press roller on the adjusting rod along the adjusting rod, and the optimal winding angle can be ensured when the adjusting rod swings and is adjusted, so that winding is stable.

Preferably, the storage device comprises a fixed bracket, a floating bracket, a fixed winding roller and a floating winding roller; the fixed winding rollers are arranged on the upper cross beam of the fixed support at intervals, the floating winding rollers are arranged on the floating support at intervals, guide rails are fixedly connected to the upright posts on two sides of the fixed support respectively, sliding grooves matched with the guide rails are formed in two sides of the floating support, and two sides of the floating support are clamped on the corresponding guide rails through the corresponding sliding grooves respectively, so that the floating support can slide along the direction of the guide rails; the floating support is positioned below the upper cross beam of the fixed support, the plurality of floating winding rollers and the plurality of fixed winding rollers are staggered and opposite to each other, and the floating winding rollers can move up and down along with the floating support; the cloth through the laminating complex winds the roller with upper and lower alternation, bypasses the fixed of storage device around roller and float around the roller, and when the conveying speed of cloth is greater than the rolling speed, floating support and float around the roller and can down move under self gravity to increase this storage device's cloth storage volume, when the conveying speed of cloth is less than the rolling speed, floating support and float around the roller under the tensioning and the tensile of cloth, can follow the guide rail orientation upward movement, thereby release storage device's cloth storage volume. The storage device has the advantages of large adjustable range and stable and reliable structure.

The storage winding mechanism of the laminating machine further comprises an auxiliary traction device, wherein the auxiliary traction device is arranged between the winding adjusting device and the storage device and comprises a second speed reducing motor, a traction roller, a traction press roller, a press arm and a second driving cylinder;

The traction roller is connected to the support plate, the traction roller is driven by a second gear motor, one side of the support plate is fixedly connected to the first support, the other side of the support plate is fixedly connected to a stand column of a fixed support of the storage device, a traction press roller is further arranged above the traction roller, the traction press roller is arranged at one end of a press arm, the other end of the press arm is rotationally connected to a telescopic rod end of a second driving cylinder, the middle part of the press arm is rotationally connected to the support plate, and the cylinder body end of the second driving cylinder is connected to the first support; the traction press roller adjusts the pressing force through a second driving cylinder, so that the phenomenon of slipping of cloth and the traction roller can be avoided, and the second driving cylinder is specifically a cylinder or a hydraulic cylinder; the auxiliary traction device can adjust the tension of cloth at the storage device according to the winding speed of the winding device, and improves the stability of cloth transmission.

Further, this laminating machine's storage winding mechanism still includes edge cutting device, auxiliary traction device's pull roll is the expansion roller, the expansion roller is prior art, specifically can be one kind of expansion roller in the CN209602817U patent, can be through the automatic expansion of cloth on the expansion roller, avoids influencing subsequent cutting when preventing the appearance of fold, makes the cloth expand and opens and also be convenient for subsequent side cut process.

The trimming device is arranged at the side of the storage device and comprises a trimming winding roller, a cutter, a third driving cylinder and a pressing and cutting table; a second bracket is arranged between the first bracket and the fixed bracket of the storage device, namely one end of the second bracket is fixedly connected with the first bracket, and the other end of the second bracket is fixedly connected with the upright post of the fixed bracket; the trimming winding roller is rotationally connected to the second bracket through a bearing seat, two ends of the trimming winding roller are respectively rotationally connected with a cutter, one side of the cutter is rotationally connected to the tail end of a telescopic rod of a corresponding third driving cylinder, a pressing cutting table is arranged below the other side of the cutter, the pressing cutting table is fixedly arranged on the second bracket, and the cylinder body end of the third driving cylinder is rotationally connected to the support plate; the cutter is a pressing cutter, cloth is pulled and expanded by the auxiliary traction device and then passes through the trimming device after coming out of the storage device, the edge of the cloth is trimmed, the appearance and the size of the cloth reach the standards, and finally the cloth is wound.

Preferably, the first guide roller is connected to the adjusting rod through a bearing seat, a screw hole is formed in the bearing seat of the first guide roller, a screw is arranged in the screw hole, one end of the screw is fixedly connected with a knob, the other end of the screw is connected with a limiting block, and the rotating shaft of the first guide roller can be extruded by the limiting block through screwing the knob, so that the first guide roller is locked and cannot rotate; when the winding device is full and needs to cut off the cloth to be rewound and wound, the first guide roller cannot rotate freely through the locking structure, so that the cloth cannot slide down due to the self-rotation of the guide roller.

Through the technical scheme, the utility model at least comprises the following beneficial effects:

According to the material storage and rolling mechanism of the film coating machine, the adjustable range of the material storage device is large, the structure is stable and reliable, the cloth from the material storage device is guided by the guide rollers, so that the cloth can be wound on the rolling roller of the rolling device after being contacted with the surface of the rolling press roller on the adjusting rod along the adjusting rod, and the optimal rolling angle can be ensured when the adjusting rod swings and adjusts, so that the rolling is stable; under the drive of the first driving cylinder, one end of the adjusting rod, provided with the winding press roller, can swing up and down, so that the pressing force of the winding press roller on the winding cloth can be adjusted at any time, the coiled material is compacted, and the cloth is tightly wound; under the drive of a speed reducing motor, the rolling compression roller can rotate, the rotation direction of the rolling compression roller is opposite to the rolling direction of the rolling device, good tension and flatness can be kept under the extrusion of the rolling compression roller, and the rolling material is more compact and has no wrinkles.

In a further scheme, the auxiliary traction device can adjust the tension of cloth at the storage device according to the winding speed of the winding device, so that the stability of cloth transmission is improved; after the cloth comes out from the storage device, the cloth is drawn and expanded by the auxiliary drawing device and then passes through the trimming device, and the edge of the cloth is trimmed, so that the appearance and the size of the cloth reach the standards and then are rolled.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a material storage and winding mechanism of a film coating machine according to an embodiment of the present application;

FIG. 2 is a schematic view of a structure of a winding adjusting device according to an embodiment of the present application;

FIG. 3 is a schematic view of a storage device according to an embodiment of the present application;

FIG. 4 is a schematic view of the auxiliary traction device according to the embodiment of the present application;

Fig. 5 is a schematic view of a structure of a trimming device according to an embodiment of the present application;

Reference numerals illustrate: the device comprises a winding device 1, a winding adjusting device 2, an adjusting rod 21, a winding press roller 22, a first driving cylinder 23, a first sprocket 24, a first gear motor 25, a second sprocket 26, a chain 27, a first guide roller 28, a second guide roller 29, a third guide roller 30, a storage device 3, a fixed bracket 31, a floating bracket 32, a fixed winding roller 33, a floating winding roller 34, a guide rail 35, an auxiliary traction device 4, a traction roller 41, a second gear motor 42, a traction press roller 43, a pressing arm 44, a second driving cylinder 45, a trimming device 5, a trimming winding roller 51, a cutter 52, a third driving cylinder 53, a pressing table 54, a first bracket 6, a 7 support plate 8, a second bracket 8 and a knob 9.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings, which are simplified schematic diagrams illustrating the basic structure of the present utility model only by way of illustration, and thus show only the constitution related to the present utility model.

In the description of the present utility model, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, it is merely for convenience of describing the present utility model and simplifying the description, and it is not indicated or implied that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus the terms describing the positional relationship are merely for illustration and are not to be construed as limiting the present patent; the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," and the like may explicitly or implicitly include one or more of such features. The specific meaning of the terms described above will be understood by those of ordinary skill in the art as the case may be.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1 to 5, a material storage winding mechanism of a film coating machine comprises a winding device 1, a winding adjusting device 2 and a material storage device 3, wherein the winding adjusting device 2 is arranged between the winding device 1 and the material storage device 3 through a first bracket 6;

The winding device 1 is in the prior art, and is a device widely applied to industrial workshops and used for winding coiled materials, and is generally composed of a frame, a driving wheel, a guide wheel, a braking device, an electronic control system and the like, so that the production efficiency can be improved, the manpower input can be reduced, the production cost can be reduced, and the specific structure of the winding device is not repeated.

The winding adjusting device 2 described with reference to fig. 2 comprises an adjusting rod 21, a winding press roller 22, a first driving cylinder 23, a first sprocket 24, a first gear motor 25, a second sprocket 26, a chain 27, a first guide roller 28, a second guide roller 29 and a third guide roller 30;

One end of the adjusting rod 21 is hinged to the first bracket 6, a winding press roller 22 is arranged at the other end of the adjusting rod 21 and is positioned above the winding device 1, the cylinder body end of the first driving cylinder 23 is hinged to the first bracket 6, the telescopic rod end of the first driving cylinder 23 is rotatably connected to the middle part of the adjusting rod 21, the first driving cylinder 23 is specifically a cylinder or a hydraulic cylinder, and under the driving of the first driving cylinder 23, one end of the adjusting rod 21, provided with the winding press roller 22, can swing up and down, so that the pressing force of the winding press roller 22 on winding cloth can be adjusted at any time, coiled materials are compacted, and the cloth is tightly wound;

The end of the rotating shaft of the rolling press roller 22 is connected with a first chain wheel 24, the adjusting rod 21 is also provided with a first gear motor 25, the output shaft of the first gear motor 25 is in transmission connection with a second chain wheel 26, the first chain wheel 24 and the second chain wheel 26 are matched through a chain 27, the rolling press roller 22 can rotate under the driving of the first gear motor 25, the rotating direction of the rolling press roller 22 is opposite to the rolling direction of the rolling device 1, good tension and flatness of cloth can be kept under the extrusion of the rolling press roller 22, and the rolling material is more compact and has no wrinkles;

The first guide roller 28, the second guide roller 29 and the third guide roller 30 are sequentially arranged on the adjusting rod 21 in a staggered manner, and the cloth from the storage device 3 is guided by a plurality of guide rollers, so that the cloth can be wound on the winding roller of the winding device 1 after being contacted with the surface of the winding press roller 22 on the adjusting rod 21 along the adjusting rod 21, and the optimal winding angle can be ensured when the adjusting rod 21 swings and adjusts, so that the winding is stable.

Referring to fig. 3, the storage device 3 includes a fixed bracket 31, a floating bracket 32, a fixed winding roller 33, and a floating winding roller 34; the fixed winding rollers 33 are arranged on the upper cross beam of the fixed support 31 at intervals, the floating winding rollers 34 are arranged on the floating support 32 at intervals, guide rails 35 are fixedly connected to the upright posts on two sides of the fixed support 31 respectively, sliding grooves matched with the guide rails 35 are formed in two sides of the floating support 32, and two sides of the floating support 32 are clamped on the corresponding guide rails 35 through corresponding sliding grooves respectively, so that the floating support 32 can slide along the direction of the guide rails 35; that is, the floating bracket 32 is located below the upper beam of the fixed bracket 31, the plurality of floating winding rollers 34 and the plurality of fixed winding rollers 33 are offset and opposite to each other, and the floating winding rollers 34 can move up and down along with the floating bracket 32; the cloth through the laminating compounding winds up and down alternately, and bypasses the fixed winding roller 33 and the floating winding roller 34 of the storage device 3, when the conveying speed of the cloth is greater than the winding speed, the floating support 32 and the floating winding roller 34 can move downwards under the self gravity, so that the cloth storage amount of the storage device 3 is increased, and when the conveying speed of the cloth is less than the winding speed, the floating support 32 and the floating winding roller 34 can move upwards along the direction of the guide rail 35 under the tensioning and stretching of the cloth, so that the cloth storage amount of the storage device 3 is released. The material storage device 3 has the advantages of wide adjustable range and stable and reliable structure.

Referring to fig. 4, the storage winding mechanism of the film coating machine further comprises an auxiliary traction device 4, wherein the auxiliary traction device 4 is arranged between the winding adjusting device 2 and the storage device 3, and the auxiliary traction device 4 comprises a traction roller 41, a second gear motor 42, a traction press roller 43, a press arm 44 and a second driving cylinder 45;

The traction roller 41 is connected to the support plate 7, the traction roller 41 is driven by a second gear motor 42, one side of the support plate 7 is fixedly connected to the first bracket 6, the other side of the support plate is fixedly connected to the upright post of the fixed bracket 31 of the storage device 3, a traction press roller 43 is further arranged above the traction roller 41, the traction press roller 43 is arranged at one end of a press arm 44, the other end of the press arm 44 is rotatably connected to a telescopic rod end of a second driving cylinder 45, the middle part of the press arm 44 is rotatably connected to the support plate 7, and the cylinder body end of the second driving cylinder 45 is connected to the first bracket 6; the traction press roller 43 adjusts the pressing force through the second driving cylinder 45 in such a way that the slipping phenomenon of the cloth and the traction roller 41 can be avoided, wherein the second driving cylinder 45 is specifically a cylinder or a hydraulic cylinder; the auxiliary traction device 4 can adjust the tension of cloth at the position of the storage device 3 according to the winding speed of the winding device 1, and improves the stability of cloth transmission.

Referring to fig. 5, the material storage winding mechanism of the film coating machine further comprises a trimming device 5, wherein the traction roller 41 of the auxiliary traction device 4 is an expansion roller, the expansion roller is in the prior art, and can be specifically an expansion roller in CN209602817U, the cloth on the expansion roller can be automatically expanded through an expansion strip on the expansion roller, the occurrence of wrinkles is prevented, the subsequent trimming is prevented from being influenced, and the cloth is expanded to facilitate the subsequent trimming process.

The edge cutting device 5 is arranged beside the storage device 3, and the edge cutting device 5 comprises an edge cutting winding roller 51, a cutter 52, a third driving cylinder 53 and a pressing and cutting table 54; a second bracket 8 is further arranged between the first bracket 6 and the fixed bracket 31 of the storage device 3, namely one end of the second bracket 8 is fixedly connected with the first bracket 6, and the other end of the second bracket 8 is fixedly connected with the upright post of the fixed bracket 31; the trimming winding roller 51 is rotationally connected to the second bracket 8 through a bearing seat, two ends of the trimming winding roller 51 are respectively rotationally connected with a cutter 52, one side of the cutter 52 is rotationally connected to the tail end of a telescopic rod of a corresponding third driving cylinder 53, a pressing and cutting table 54 is arranged below the other side of the cutter 52, the pressing and cutting table 54 is fixedly arranged on the second bracket 8, and the cylinder body end of the third driving cylinder 53 is rotationally connected to the support plate 7;

The cutter 52 is a press-cutting cutter 52, cloth is drawn and expanded by the auxiliary drawing device 4 after coming out of the storage device 3, then passes through the trimming device 5, the edge of the cloth is trimmed, the appearance and the size of the cloth reach the standards, and finally the cloth is wound.

In a specific embodiment, referring to fig. 2, the first guide roller 28 is connected to the adjusting rod 21 through a bearing seat, a screw hole is formed in the bearing seat of the first guide roller 28, a screw is arranged in the screw hole, one end of the screw is fixedly connected with a knob 9, the other end of the screw is connected with a limiting block, and screwing the knob 9 can enable the limiting block to squeeze the rotating shaft of the first guide roller 28, so that the first guide roller 28 is locked and cannot rotate; when the winding device 1 is full and needs to cut off the cloth and wind again, the first guide roller 28 cannot rotate freely through the locking structure, so that the cloth cannot slide down due to the self-rotation of the guide roller.

The foregoing description is only illustrative of the preferred embodiments of the present utility model, and various changes and modifications can be made by those skilled in the art without departing from the spirit and principles of the present utility model, and it is intended to cover all such modifications, equivalents, and improvements as fall within the true spirit and scope of the utility model.

Claims (5)

1. The utility model provides a storage winding mechanism of laminating machine which characterized in that: the device comprises a winding device (1), a winding adjusting device (2) and a storage device (3), wherein the winding adjusting device (2) is arranged between the winding device (1) and the storage device (3) through a first bracket (6);

The winding adjusting device (2) comprises an adjusting rod (21), a winding press roller (22), a first driving cylinder (23), a first sprocket (24), a first gear motor (25), a second sprocket (26), a chain (27), a first guide roller (28), a second guide roller (29) and a third guide roller (30);

One end of the adjusting rod (21) is hinged to the first bracket (6), a winding press roller (22) is arranged at the other end of the adjusting rod (21) and is positioned above the winding device (1), the cylinder body end of the first driving cylinder (23) is hinged to the first bracket (6), and the telescopic rod end of the first driving cylinder (23) is rotatably connected to the middle part of the adjusting rod (21);

The tail end of a rotating shaft of the winding press roller (22) is connected with a first sprocket (24), a first gear motor (25) is further arranged on the adjusting rod (21), a second sprocket (26) is connected with an output shaft of the first gear motor (25) in a transmission manner, and the first sprocket (24) and the second sprocket (26) are matched through a chain (27);

The first guide roller (28), the second guide roller (29) and the third guide roller (30) are sequentially arranged on the adjusting rod (21) in a staggered mode.

2. The stock winding mechanism of a laminating machine according to claim 1, wherein: the storage device (3) comprises a fixed bracket (31), a floating bracket (32), a fixed winding roller (33) and a floating winding roller (34); the fixed winding rollers (33) are arranged on the upper cross beam of the fixed bracket (31) at intervals, and the floating winding rollers (34) are arranged on the floating bracket (32) at intervals;

Guide rails (35) are fixedly connected to the upright posts on two sides of the fixed support (31) respectively, sliding grooves matched with the guide rails (35) are formed in two sides of the floating support (32), and the two sides of the floating support (32) are clamped on the corresponding guide rails (35) through corresponding sliding grooves respectively, so that the floating support (32) can slide along the guide rails (35).

3. The stock winding mechanism of a laminating machine according to claim 2, wherein: the automatic feeding device is characterized by further comprising an auxiliary traction device (4), wherein the auxiliary traction device (4) is arranged between the winding adjusting device (2) and the storage device (3), and the auxiliary traction device (4) comprises a traction roller (41), a second speed reducing motor (42), a traction press roller (43), a press arm (44) and a second driving cylinder (45);

The traction roller (41) is connected to the support plate (7), the traction roller (41) is driven by the second gear motor (42), one side of the support plate (7) is fixedly connected to the first support (6), the other side of the support plate is fixedly connected to the fixed support (31) of the storage device (3), the traction roller (41) is further provided with a traction press roller (43), the traction press roller (43) is arranged at one end of the press arm (44), the other end of the press arm (44) is rotationally connected to the telescopic rod end of the second driving cylinder (45), the middle part of the press arm (44) is rotationally connected to the support plate (7), and the cylinder body end of the second driving cylinder (45) is connected to the first support (6).

4. A stock winding mechanism of a laminating machine according to claim 3, wherein: the device also comprises a trimming device (5), and a traction roller (41) of the auxiliary traction device (4) is an expansion roller; the trimming device (5) is arranged beside the storage device (3), and the trimming device (5) comprises a trimming winding roller (51), a cutter (52), a third driving cylinder (53) and a pressing and cutting table (54);

Still be provided with second support (8) between fixed bolster (31) of first support (6) and storage device (3), cut edge around roller (51) rotation connect in second support (8), cut edge around the both ends of roller (51) rotate respectively and be connected with cutter (52), one side of cutter (52) rotates and is connected in the telescopic link end of corresponding third actuating cylinder (53), and the opposite side below of cutter (52) is provided with presses and cuts platform (54), press and cut platform (54) fixed set up on second support (8), the cylinder body end of third actuating cylinder (53) rotates and is connected in extension board (7).

5. The stock winding mechanism of a laminating machine according to claim 1, wherein: the first guide roller (28) is connected to the adjusting rod (21) through a bearing seat, a screw hole is formed in the bearing seat of the first guide roller (28), a screw is arranged in the screw hole, one end of the screw is fixedly connected with a knob (9), the other end of the screw is connected with a limiting block, and the rotating shaft of the first guide roller (28) is extruded by the limiting block by screwing the knob (9).