Cutting device of gripper shuttle loom

Abstract

The cutting device comprises a rack and a connecting plate, the two ends of the connecting plate are connected with the rack respectively, a sliding assembly is arranged on the top face of the connecting plate, a control unit is fixedly arranged on one side of the rack, the sliding assembly is electrically connected with the control unit, and the bottom of the sliding assembly is connected with a cutting assembly. The cutting-off assembly horizontally moves in the width direction of the connecting plate, a fixing assembly is arranged below the connecting plate, the bottom of the fixing assembly is fixedly connected to the rack, a tensioning assembly is arranged above the fixing assembly, the two sides of the tensioning assembly are fixedly connected to the rack, the fixing assembly is used for fixing the textile fabric on the winding roller, and the fixing assembly is used for fixing the textile fabric on the winding roller. The tensioning assembly tensions the textile fabric between the conveying mechanism and the winding roller so that the textile fabric can be cut by the cutting assembly. According to the textile fabric cutting device, the textile fabric is fixed and tensioned through the fixing assembly and the tensioning assembly, and the situation that the textile fabric slides in the cutting-off process and deviates in the cutting process is prevented.

Description

Technical Field

[0001] The present application relates to the field of projectile looms, and in particular to a cutting device of a projectile loom. Background Art

[0002] The projectile loom is a loom that uses a projectile shuttle to introduce the weft yarn into the shed for weaving. It has the characteristics of high speed, large load and good operating reliability. It can weave special industrial fabrics such as screens, cotton, linen, silk, and wool fibers. It is suitable for the production of multi-color weft fabrics or multi-width fabrics.

[0003] A Chinese utility model with publication number CN212741686U discloses a cutting device for a shuttle machine, a cutting device for a shuttle machine, which is arranged on a frame of the shuttle machine, including a fixed plate arranged on the frame, a cutting mechanism slidably arranged on the fixed plate, a guide mechanism arranged on the fixed plate, and a driving mechanism for driving the cutting mechanism to move. The cutting device can cut the textile under the action of the driving mechanism, instead of manual cutting, saving manpower, improving work efficiency, and being able to maintain stability during movement. However, during use, the cut textile is not fixed and limited, causing the textile to be offset when being cut, affecting the cutting effect.

[0004] With respect to the above-mentioned related technologies, the applicant believes that when the cutting device is cutting the textile, if the cutting textile is not fixed and limited, the textile may be offset during cutting, thus affecting the cutting effect. Utility Model Content

[0005] In order to prevent deviation of textile fabrics during cutting, the present application provides a cutting device for a gripper loom.

[0006] The cutting device of a gripper loom provided in the present application adopts the following technical solution:

[0007] A cutting device for a shuttle loom comprises a frame and a connecting plate, wherein both ends of the connecting plate are connected to the frame respectively, a sliding assembly is arranged on the top surface of the connecting plate, a control unit is fixedly arranged on one side of the frame, the sliding assembly is electrically connected to the control unit, a cutting assembly is connected to the bottom of the sliding assembly, and the cutting assembly moves horizontally in the width direction of the connecting plate, a fixing assembly is arranged under the connecting plate, the bottom of the fixing assembly is fixedly connected to the frame, a tensioning assembly is arranged above the fixing assembly, and both sides of the tensioning assembly are fixedly connected to the frame, the fixing assembly fixes the textile on the winding roll, and the tensioning assembly tensions the textile between the transmission mechanism and the winding roll for cutting by the cutting assembly.

[0008] By adopting the above technical solution, when the textile is removed from the winding roller after collection, the textile on the winding roller is fixed and limited by the fixing roller, and the textile between the transmission mechanism and the winding roller is tensioned by the tensioning roller to prevent the cutting component from slipping when cutting the textile, resulting in offset cutting.

[0009] Optionally, the fixing assembly includes a fixing plate, a first cylinder, a fixing frame and a fixing roller, the two ends of the fixing plate are respectively fixedly connected to the two sides of the frame, the top surface of the fixing plate is fixedly connected to the two first cylinders, the two first cylinders are electrically connected to the control unit, the output ends of the two first cylinders are respectively connected to the bottom of the fixing frame, the top of the fixing frame is connected to the fixing roller, the two ends of the fixing roller are respectively fixedly connected to the inner walls on both sides of the top of the fixing frame, and the fixing roller moves up and down in the vertical direction.

[0010] By adopting the above technical solution, the fixed plate is fixed on the frame, the first cylinder is electrically connected to the control unit, the control unit controls the extension and retraction of the first cylinder to control the lifting and lowering of the fixed roll, and the lifting and lowering of the fixed roll is used to adjust the fixed limit of the textile on the winding roll to prevent deviation during the cutting process.

[0011] Optionally, the tensioning assembly includes two tensioning plates, a tensioning frame, a second cylinder and a tensioning roller, the two tensioning plates are fixed on the frame, the two tensioning plates are respectively fixedly connected to the second cylinders, the second cylinders are electrically connected to the control unit, the output ends of the two second cylinders respectively pass through the tensioning plates and are connected to one end of the tensioning frame, the other end of the tensioning frame is connected to the tensioning roller, the two ends of the tensioning roller are respectively fixedly connected to the inner walls on both sides of one end of the tensioning frame, and a sliding assembly is provided on one side of the tensioning roller.

[0012] By adopting the above technical solution, the tensioning frame is fixed on the frame, the second cylinder is electrically connected to the control unit, the control unit controls the second cylinder to extend and retract, and the extension and retraction of the second cylinder drives the tensioning roller to move, so that the tensioning roller can tension the textile between the conveying mechanism and the winding roller, preventing the textile between the conveying mechanism and the winding roller from becoming loose due to lack of tension, resulting in deviation during the cutting process.

[0013] Optionally, the sliding assembly includes two parallel sliding plates, a mounting plate and a driving component, the bottoms of the two sliding plates are respectively rollingly connected to rollers, the rollers drive the two sliding plates to be slidingly connected to the connecting plates, the tops of the two sliding plates are respectively fixedly connected to the mounting plates, the mounting plates are located between the two parallel sliding plates, and the tops of the mounting plates are fixedly connected to the driving component.

[0014] By adopting the above technical solution, the connecting plate is fixed on the frame, a sliding plate is slidably arranged on the connecting plate, and a mounting plate is arranged on two parallel sliding plates, so that the mounting plate can slide on the horizontal plane of the connecting plate, thereby driving the driving components on the mounting plate to move.

[0015] Optionally, two slide rails are provided on the top surface of the connecting plate, and the length direction of the two slide rails is consistent with the length direction of the connecting plate. The two slide rails are respectively slidably connected to rollers, and a limiting groove is provided between the two slide rails, and the length direction of the limiting groove is consistent with the length direction of the slide rails. A rack is provided on one side of the limiting groove, and the rack is fixed on one side of the slide rail, and the length direction of the rack is consistent with the length direction of the limiting groove, and the rack is meshingly connected to the driving component.

[0016] By adopting the above technical solution, a slide rail is provided on the connecting plate for the sliding plate to move in the slide rail, a limit groove is provided between the slide rails for the cutting component to move in the limit groove, and a rack is provided on one side of the limit groove to cooperate with the driving component to drive the cutting component to move in the limit groove.

[0017] Optionally, the driving component includes a driving motor and a gear, the driving motor is fixed on the mounting plate, the output end of the driving motor passes through the mounting plate and is rotatably connected to the cutting assembly, the driving motor is electrically connected to the control unit, the gear is located below the output end of the driving motor, and the gear is meshedly connected to the rack.

[0018] By adopting the above technical solution, the drive motor is electrically connected to the control unit, and the control unit controls the start and stop of the drive motor. When the drive motor is started, the drive motor transmission gear rotates, and the gear engages with the rack, so that the gear moves on the rack. When the drive motor is turned off, the gear stops rotating, and the gear stops moving on the rack.

[0019] Optionally, the cutting assembly includes a rotating shaft and a disc blade, one end of the rotating shaft is connected to the output end of the driving motor, and the other end of the rotating shaft is connected to the disc blade, the disc blade is fixedly sleeved on the bottom of the rotating shaft, the rotating shaft is connected to a gear, and the gear is fixedly sleeved on the middle of the rotating shaft, the rotating shaft moves horizontally in a limit groove, and a distance measuring component is provided at one end of the limit groove.

[0020] By adopting the above technical solution, the rotating shaft is connected to the output end of the driving motor, the driving motor rotates, driving the rotating shaft to rotate, the gear is fixedly sleeved on the rotating shaft, the rotating shaft drives the gear to rotate, and the disc blade is also fixedly sleeved on the rotating shaft, so that the rotating shaft also drives the disc blade to rotate.

[0021] Optionally, the ranging component includes a protective shell and a ranging element, one side of the protective shell is fixedly connected to one end of the limiting groove, the ranging element is provided inside the protective shell, and the ranging element is electrically connected to the control unit.

[0022] By adopting the above technical solution, the distance measuring element is electrically connected to the control unit, the distance measuring element detects the position of the rotating shaft moving in the limit groove and feeds back to the control unit, the control unit controls the start and stop of the drive motor, thereby controlling the movement of the rotating shaft in the limit groove, preventing the rotating shaft from hitting the limit groove multiple times and causing damage to the device.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. When the winding roll needs to be removed after completing the collection, the connected textile needs to be cut. The textile on the winding roll is fixed and limited by the fixing roll, and the textile between the transmission mechanism and the winding roll is tensioned by the tensioning roll. Then, the textile is cut by the cutting assembly. During the cutting process, the textile is in a fixed and tensioned state, which prevents the textile from slipping during the cutting process, resulting in offset in the cutting.

[0025] 2. The distance measuring component detects and controls the moving position of the cutting component to prevent the cutting component from hitting one end of the limit groove when moving and cutting. Multiple collisions may cause damage to the device and affect its service life.

[0026] 3. The control unit uses unified control to fix and tension the textile, and then controls the movement of the cutting components, reducing manual operations and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The invention is a schematic diagram of the overall structure of a cutting device of a projectile loom.

[0028] Figure 2 The present invention is a front view of a cutting device of a projectile shuttle loom.

[0029] Figure 3 The present invention is a partial structural schematic diagram of a cutting device of a projectile shuttle loom.

[0030] Figure 4 The invention discloses a flow chart of a control unit of a cutting device of a projectile loom.

[0031] Explanation of the reference numerals: 1. frame; 11. connecting plate; 111. slide rail; 112. limit groove; 113. rack; 12. winding roller; 13. transmission mechanism; 2. fixing assembly; 21. fixing plate; 22. first cylinder; 23. fixing frame; 24. fixing roller; 3. tensioning assembly; 31. tensioning plate; 32. tensioning frame; 33. second cylinder; 34. tensioning roller; 4. control unit; 5. sliding assembly; 51. sliding plate; 511. roller; 52. mounting plate; 53. driving component; 531. driving motor; 532. gear; 6. cutting assembly; 61. rotating shaft; 62. disc blade; 7. distance measuring component; 71. protective shell; 72. distance measuring element. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-4 This application is described in further detail.

[0033] The embodiment of the present application discloses a cutting device for a gripper loom.

[0034] Reference Figure 1 A cutting device of a shuttle loom comprises a frame 1 and a connecting plate 11, wherein both ends of the connecting plate 11 are connected to the frame 1 respectively, a sliding assembly 5 is arranged on the top surface of the connecting plate 11, a control unit 4 is fixedly arranged on one side of the frame 1, the sliding assembly 5 is electrically connected to the control unit 4, the control unit 4 controls the movement of the sliding assembly 5, the bottom of the sliding assembly 5 is connected to the cutting assembly 6, the sliding assembly 5 drives the cutting assembly 6 to move horizontally in the axial direction of the winding roll 12, a fixing assembly 2 is arranged below the connecting plate 11, the fixing assembly 2 is located at the bottom of the frame 1, the bottom of the fixing assembly 2 is fixedly connected to the frame 1, a tensioning assembly 3 is arranged above the fixing assembly 2, both sides of the tensioning assembly 3 are fixedly connected to the frame 1 respectively, the fixing assembly 2 is located below the winding roll 12, the tensioning assembly 3 is located above the winding roll 12, the fixing assembly 2 fixes the textile on the winding roll 12, the tensioning assembly 3 tensions the textile between the transmission mechanism 13 and the winding roll 12 for cutting by the cutting assembly 6.

[0035] Reference Figure 2 The fixing assembly 2 includes a fixing plate 21, a first cylinder 22, a fixing frame 23 and a fixing roll 24. The two ends of the fixing plate 21 are fixedly connected to the two sides of the frame 1 respectively. The top surface of the fixing plate 21 is fixedly connected to the two first cylinders 22. The two first cylinders 22 are electrically connected to the control unit 4. The control unit 4 controls the lifting of the first cylinders 22. The output ends of the two first cylinders 22 are respectively connected to the bottom of the fixing frame 23. The top of the fixing frame 23 is connected to the fixing roll 24. The two ends of the fixing roll 24 are respectively fixedly connected to the inner walls on both sides of the top of the fixing frame 23. The first cylinder 22 drives the fixing roll 24 to move up and down in the vertical direction.

[0036] The tensioning assembly 3 includes two tensioning plates 31, a tensioning frame 32, a second cylinder 33 and a tensioning roller 34. The two tensioning plates 31 are fixed on the frame 1. The two tensioning plates 31 are fixedly connected to the second cylinders 33 respectively. The second cylinders 33 are electrically connected to the control unit 4. The control unit 4 controls the lifting and lowering of the second cylinders 33. The output ends of the two second cylinders 33 respectively pass through the tensioning plates 31 and are connected to one end of the tensioning frame 32. The other end of the tensioning frame 32 is connected to the tensioning roller 34. The two ends of the tensioning roller 34 are fixedly connected to the inner walls on both sides of one end of the tensioning frame 32, so that the second cylinder 33 drives the tensioning roller 34 to move up and down in the vertical direction.

[0037] Reference Figure 3 The sliding assembly 5 includes two parallel sliding plates 51, a mounting plate 52 and a driving component 53. The bottoms of the two sliding plates 51 are respectively connected to rollers 511 for rolling, and the rollers 511 drive the two sliding plates 51 to slide and connect to the connecting plate 11. The tops of the two sliding plates 51 are respectively connected to the mounting plates 52 for fixing, and the mounting plates 52 are located between the two parallel sliding plates 51. The tops of the mounting plates 52 are fixedly connected to the driving component 53. Two slide rails 111 are provided on the top surface of the connecting plate 11. The length direction of the slide rail 111 is consistent with the length direction of the connecting plate 11. The two slide rails 111 are respectively slidably connected to the rollers 511. A limiting groove 112 is provided between the two slide rails 111. The length direction of the limiting groove 112 is consistent with the length direction of the slide rail 111. The limiting groove 112 provides a guiding effect for the movement of the driving component 53. A rack 113 is provided on one side of the limiting groove 112. The rack 113 is fixed on one side of the slide rail 111. The length direction of the rack 113 is consistent with the length direction of the limiting groove 112.

[0038] Reference Figure 3The driving component 53 includes a driving motor 531 and a gear 532. The cutting assembly 6 includes a rotating shaft 61 and a disc blade 62. The driving motor 531 is fixed on the mounting plate 52. The driving motor 531 is electrically connected to the control unit 4. The control unit 4 controls the start and stop of the driving motor 531. The driving component 53 provides power for the rotation and movement of the cutting assembly 6. The output end of the driving motor 531 passes through the mounting plate 52 and is rotatably connected to one end of the rotating shaft 61. The other end of the rotating shaft 61 is connected to the disc blade 62. The gear 532 is fixedly sleeved on the bottom of the rotating shaft 61, and the rotating shaft 61 is also connected to the gear 532. The gear 532 is fixedly sleeved on the middle of the rotating shaft 61. The gear 532 is located below the output end of the driving motor 531. The gear 532 is meshed and connected to the rack 113. The driving motor 531 is started, and the driving motor 531 drives the rotating shaft 61 to rotate. The rotating shaft 61 drives the disc blade 62 to rotate, so that the disc blade 62 has the ability to cut. At the same time, the rotation of the rotating shaft 61 drives the gear 532 to rotate. The rotating gear 532 and the fixed gear 532 are connected to the fixed gear 532. The rack 113 fixed on the connecting plate 11 is meshed, and the gear 532 moves to drive the rotating shaft 61 to move horizontally in the limiting groove 112, thereby driving the rotating disc blade 62 to move horizontally with the rotating shaft 61. A distance measuring component 7 is provided at one end of the limiting groove 112. The distance measuring component 7 includes a protective shell 71 and a distance measuring element 72. One side of the protective shell 71 is fixedly connected to one end of the limiting groove 112. The protective shell 71 is provided with a distance measuring element 72 inside. The protective shell 71 plays a protective role in protecting the distance measuring element 72 to prevent external dust from affecting the distance measuring element. The accuracy of the component 72 is measured. The distance measuring element 72 is electrically connected to the control unit 4. The distance measuring element 72 detects the distance between the rotating shaft 61 and one end of the limiting groove 112, and feeds back to the control unit 4 in real time. When the distance between the rotating shaft 61 and one end of the limiting groove 112 reaches the set value, the control unit 4 stops driving the motor 531, stops the rotating shaft 61 from rotating, and thus stops the disc blade 62 from rotating and moving, preventing the rotating shaft 61 from moving excessively and hitting one end of the limiting groove 112. Multiple collisions cause damage to the device and reduce its service life.

[0039] Reference Figure 3 and Figure 4When the textile is cut, the control unit 4 sends instructions to the first cylinder 22 and the second cylinder 33 at the same time, starts the first cylinder 22 to fix the textile on the winding roll 12, and starts the second cylinder 33 to tension the textile, stops the first cylinder 22 and the second cylinder 33, and then the control unit 4 starts the drive motor 531, and the drive motor 531 drives the cutting component 6 to move and cut the textile. During the textile cutting process, the distance measuring element 72 always detects the moving position of the cutting component 6 and feeds back to the control unit 4. When the moving position of the cutting component 6 reaches the set value, the control unit 4 stops the drive motor 531, stops the cutting component 6 from moving to complete the cutting, and then the control unit 4 starts the drive motor 531 again to return the cutting component 6 to the initial position, and then starts the first cylinder 22 and the second cylinder 33 to return to the initial position, completing a complete cutting operation.

[0040] The implementation principle of the cutting device of a gripper loom in the embodiment of the present application is as follows:

[0041] When the winding roll 12 needs to be removed after completing the collection, the connected textile needs to be cut, the device is started, and the control unit 4 sends instructions to the first cylinder 22 and the second cylinder 33 at the same time, so that the fixing roll 24 fixes the textile on the winding roll 12, and the tensioning roll 34 tensions the textile between the transmission mechanism 13 and the winding roll 12. The control unit 4 stops the first cylinder 22 and the second cylinder 33, and then the control unit 4 starts the drive motor 531, and the drive motor 531 drives the cutting component 6 to move. In the process of the cutting component 6 moving and cutting the textile The distance measuring element 72 constantly detects the distance between the cutting component 6 and one end of the limiting groove 112 and feeds back to the control unit 4. When the distance between the cutting component 6 and one end of the limiting groove 112 reaches the set value, the control unit 4 stops driving the motor 531 to stop the cutting component 6 from moving and complete the cutting. Then the control unit 4 starts the driving motor 531 again to return the cutting component 6 to the initial position, and then starts the first cylinder 22 to drive the fixing component 2 to return to the initial position, and starts the second cylinder 33 to drive the tensioning component 3 to return to the initial position, completing a complete cutting operation.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cutting device for a gripper loom, characterized in that: The invention comprises a frame (1) and a connecting plate (11), wherein both ends of the connecting plate (11) are respectively connected to the frame (1), a sliding assembly (5) is arranged on the top surface of the connecting plate (11), a control unit (4) is fixedly arranged on one side of the frame (1), the sliding assembly (5) is electrically connected to the control unit (4), the bottom of the sliding assembly (5) is connected to a cutting assembly (6), the cutting assembly (6) moves horizontally in the width direction of the connecting plate (11), a fixing assembly (2) is arranged below the connecting plate (11), the bottom of the fixing assembly (2) is fixedly connected to the frame (1), a tensioning assembly (3) is arranged above the fixing assembly (2), the two sides of the tensioning assembly (3) are fixedly connected to the frame (1), the fixing assembly (2) fixes the textile on the winding roll (12), and the tensioning assembly (3) tensions the textile between the transmission mechanism (13) and the winding roll (12) for cutting by the cutting assembly (6).

2. A cutting device for a gripper loom according to claim 1, characterized in that: The fixing assembly (2) comprises a fixing plate (21), a first cylinder (22), a fixing frame (23) and a fixing roller (24); two ends of the fixing plate (21) are respectively fixedly connected to two sides of the frame (1); the top surface of the fixing plate (21) is fixedly connected to two first cylinders (22); the two first cylinders (22) are electrically connected to a control unit (4); the output ends of the two first cylinders (22) are respectively connected to the bottom of the fixing frame (23); the top of the fixing frame (23) is connected to the fixing roller (24); two ends of the fixing roller (24) are respectively fixedly connected to the inner walls on both sides of the top of the fixing frame (23); and the fixing roller (24) moves up and down in a vertical direction.

3. The cutting device of a gripper loom according to claim 1, characterized in that: The tensioning assembly (3) comprises two tensioning plates (31), a tensioning frame (32), a second cylinder (33) and a tensioning roller (34); the two tensioning plates (31) are fixed on the frame (1); the two tensioning plates (31) are respectively fixedly connected to the second cylinder (33); the second cylinder (33) is electrically connected to the control unit (4); the output ends of the two second cylinders (33) respectively pass through the tensioning plates (31) and are connected to one end of the tensioning frame (32); the other end of the tensioning frame (32) is connected to the tensioning roller (34); the two ends of the tensioning roller (34) are respectively fixedly connected to the inner walls on both sides of one end of the tensioning frame (32); and a sliding assembly (5) is provided on one side of the tensioning roller (34).

4. A cutting device for a gripper loom according to claim 3, characterized in that: The sliding assembly (5) comprises two parallel sliding plates (51), a mounting plate (52) and a driving component (53); the bottoms of the two sliding plates (51) are respectively rollingly connected to rollers (511); the rollers (511) drive the two sliding plates (51) to be slidingly connected to the connecting plate (11); the tops of the two sliding plates (51) are respectively fixedly connected to the mounting plates (52); the mounting plates (52) are located between the two parallel sliding plates (51); and the tops of the mounting plates (52) are fixedly connected to the driving component (53).

5. A cutting device for a gripper loom according to claim 4, characterized in that: Two slide rails (111) are provided on the top surface of the connecting plate (11), the length direction of the two slide rails (111) is consistent with the length direction of the connecting plate (11), the two slide rails (111) are respectively slidably connected to the rollers (511), a limiting groove (112) is provided between the two slide rails (111), the length direction of the limiting groove (112) is consistent with the length direction of the slide rail (111), a rack (113) is provided on one side of the limiting groove (112), the rack (113) is fixed on one side of the slide rail (111), the length direction of the rack (113) is consistent with the length direction of the limiting groove (112), and the rack (113) is meshingly connected to the driving component (53).

6. A cutting device for a gripper loom according to claim 5, characterized in that: The driving component (53) comprises a driving motor (531) and a gear (532); the driving motor (531) is fixedly mounted on the mounting plate (52); an output end of the driving motor (531) passes through the mounting plate (52) and is rotatably connected to the cutting component (6); the driving motor (531) is electrically connected to the control unit (4); the gear (532) is located below the output end of the driving motor (531); and the gear (532) is meshedly connected to the rack (113).

7. A cutting device for a gripper loom according to claim 6, characterized in that: The cutting assembly (6) comprises a rotating shaft (61) and a disc blade (62); one end of the rotating shaft (61) is connected to the output end of a driving motor (531); the other end of the rotating shaft (61) is connected to the disc blade (62); the disc blade (62) is fixedly sleeved on the bottom of the rotating shaft (61); the rotating shaft (61) is connected to a gear (532); the gear (532) is fixedly sleeved on the middle of the rotating shaft (61); the rotating shaft (61) moves horizontally in a limiting groove (112); and a distance measuring component (7) is provided at one end of the limiting groove (112).

8. A cutting device for a gripper loom according to claim 7, characterized in that: The distance measuring component (7) comprises a protective shell (71) and a distance measuring element (72); one side of the protective shell (71) is fixedly connected to one end of the limiting groove (112); a distance measuring element (72) is provided inside the protective shell (71); and the distance measuring element (72) is electrically connected to the control unit (4).

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