Automatic hard paper dispensing and conveying device

Abstract

The application discloses a kind of hard paper automatic package transmission device, including rack, be sequentially arranged in the direction of hard paper conveying and be set on rack and feed mechanism, package mechanism and discharge mechanism;Feeding mechanism includes hard paper conveying groove and shifter rod assembly;There is a package area in the front end of hard paper conveying groove, and the package mechanism is arranged in the package area, and the package mechanism includes reference baffle arranged in the front side of package area, guide groove arranged in the rear side of package area, channel arranged in one side of package area, and the other side opposite to channel is provided with push plate, and the guide groove is provided with plugboard and air knife blowing downward above, and the outer side of reference baffle is provided with limit sensor, and the probe of limit sensor passes through slot and slightly exceeds the inner side of reference baffle.The application can automatically package hard paper according to predetermined number, realize uninterrupted production, and further reduce production cost, improve work efficiency.

Description

Technical Field

[0001] This invention relates to the field of packaging technology, and more specifically to an automatic cardboard packaging and conveying device. Background Technology

[0002] Currently, cardboard repackaging on the market is divided into two methods: manual weighing and repackaging, or feeding individual sheets of paper to a receiving device, counting them with a counting device, and outputting them for the next process after reaching a set number of sheets.

[0003] Manual weighing and repackaging not only takes up a large portion of the packaging process, resulting in low packaging efficiency, but also the quality of repackaging depends entirely on the skill level of the repackaging workers, leading to inconsistent repackaging standards and a significant human element involved.

[0004] However, when feeding individual sheets of paper to the receiving device, counting them using a counting device (with 125 sheets per group of cardboard) takes a lot of time, resulting in low packaging production speed. In addition, since each sheet of paper is very thin, only 0.44mm and weighs about 16g, the cardboard group is prone to tipping over during the counting and stacking process. Summary of the Invention

[0005] Based on this, and in response to the above problems, the present invention provides an automatic cardboard packaging and transmission device.

[0006] The objective of this invention can be achieved through the following technical solutions: An automatic cardboard packaging and conveying device includes a frame, a feeding mechanism, a packaging mechanism, and a discharging mechanism arranged sequentially on the frame along the cardboard conveying direction. The feeding mechanism includes a cardboard conveying trough and a lever assembly. The cardboard conveying trough includes two upper guide rods spaced apart and two lower guide rods spaced apart. The distance between the two lower guide rods is less than the width of the cardboard. The top surfaces of the two lower guide rods form a support surface for supporting the cardboard. The distance between the two upper guide rods is adapted to the width of the cardboard. There are two lever assemblies, which are symmetrically arranged on the frame. Each lever assembly includes a feeding plate, a feeding plate lifting cylinder for driving the feeding plate to rise and fall, and a feeding plate horizontal movement cylinder for driving the feeding plate to move horizontally. The feeding plate has a groove that cooperates with the lower guide rod. There is an movable gap between the two feeding plates. A sub-packaging area is located at the front end of the cardboard conveying trough. A sub-packaging mechanism is set within the sub-packaging area. The sub-packaging mechanism includes a reference baffle located at the front of the sub-packaging area, a guide groove located at the rear of the sub-packaging area for guiding the cardboard, a channel located on one side of the sub-packaging area, and a pusher plate located on the opposite side of the channel. A pusher plate cylinder is fixed on a mounting frame above the pusher plate to drive the pusher plate to move towards the channel. An insert plate and an insert plate cylinder for driving the insert plate to rise and fall are located above the guide groove on the mounting frame. An air blowing knife for blowing air downwards is also located above the guide groove. A limit sensor is horizontally arranged on the outer side of the reference baffle. A groove is opened on the reference baffle, and the probe of the limit sensor passes through the groove and slightly extends beyond the inner side of the reference baffle. The guide groove consists of a first guide plate and a second guide plate fixed at intervals on the bottom surface of the mounting frame. The first guide plate and the second guide plate form a temporary storage groove adapted to the cardboard assembly between the reference baffle and the reference baffle. The channel consists of a base plate and a front baffle and a rear baffle vertically arranged at the front and rear edges of the base plate. The discharge mechanism includes a support base, a motor mounted on the support base, a tilting box driven by the motor to swing, a forming push plate transverse movement cylinder located below the tilting box, a forming push plate driven by the forming push plate transverse movement cylinder to move horizontally, and a positioning sensor fixed on one side of the support base. The top and the side facing the channel of the tilting box are provided with openings, and the bottom and front sides are provided with notches for the forming push plate to pass through. It also includes a top material cylinder fixed on the rear side of the tilting box and a pressure block driven by the top material cylinder. The rear side of the tilting box has a through hole for the pressure block to pass through.

[0007] Using the above technical solution, the cardboard in the queue is placed in the cardboard conveyor trough. The lever assembly pushes the cardboard in the queue forward. When the cardboard at the front of the queue contacts the reference baffle, the limit sensor is activated, and an air-blowing knife begins to blow air, creating a gap between the cardboard sheets below the air-blowing knife. A drive plate descends and inserts into the gap, separating the cardboard sheets at the front of the queue into a cardboard group. The drive pusher plate then pushes this cardboard group to the next process. Afterward, the pusher plate and the insert plate return to their initial positions, thus completing the automatic packaging of a predetermined number of cardboard sheets. This device has a high degree of automation, enabling uninterrupted production, thereby reducing production costs and improving work efficiency.

[0008] As a further aspect of the present invention: the bottom surface of the mounting frame is provided with an insert plate position adjusting block for adjusting the position of the insert plate. The insert plate position adjusting block includes a horizontal plate, an upper vertical plate and a lower vertical plate connected to the upper and lower sides of the horizontal plate. The lower vertical plate abuts against the rear side of the insert plate. The horizontal plate has a slotted hole, and the mounting frame has a threaded hole corresponding to the slotted hole. A bolt is installed in the threaded hole, and the end of the bolt passes through the threaded hole and is screwed into the slotted hole, thereby fixing the insert plate position adjusting block to the mounting frame. Using the above technical solution, the number of sheets of cardboard in each cardboard group is controlled by the distance between the insert plate and the reference baffle. Thus, by adjusting the position of the insert plate and the distance between the insert plate and the reference baffle using the insert plate position adjusting block, the number of sheets of cardboard in each cardboard group is controlled.

[0009] As a further aspect of the present invention, the bottom surface of the lower vertical plate is provided with a stop member located above the front end of the cardboard conveying groove. This design prevents the cardboard from being hooked and pulled upwards when the insert plate is pulled out.

[0010] As a further aspect of the present invention: a mounting opening is provided on the first guide plate, and an adjusting block is inserted into the mounting opening. Using the above technical solution, the position of the adjusting block can be adjusted left and right to meet the requirements for packaging cardboard of different widths.

[0011] As a further aspect of the invention: the lower end of the insert plate has a three-pronged plug, the thickness of which gradually decreases from top to bottom. Using this technical solution, the insert plate is easier to insert into a queue of cardboard and also easier to remove.

[0012] As a further aspect of the present invention: a feeding plate slide is fixed on the output end of each feeding plate transverse cylinder, the feeding plate lifting cylinder is fixed on the feeding plate slide, and slide rails are fixed on the left and right sides of the frame respectively, and the feeding plate slides are fixed on the corresponding slide rails respectively.

[0013] In summary, this invention enables automatic packaging of cardboard according to a predetermined number of sheets, achieving uninterrupted production, thereby reducing production costs and improving work efficiency. Attached Figure Description

[0014] The invention will now be further described with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the structure of an automatic cardboard packaging and conveying device according to the present invention; Figure 2 This is a schematic diagram of the toggle assembly of the present invention; Figure 3 This is a schematic diagram of the subcontracting mechanism of the present invention; Figure 4This is an exploded view of the subcontracting mechanism of the present invention; Figure 5 This shows that after the insert plate is driven by the cylinder to descend, it is inserted into the cardboard in the queue, dividing the front part of the cardboard in the queue into a cardboard group. Figure 6 This illustrates how a pusher plate, driven by a cylinder, pushes the pusher plate out of the channel to eject the cardboard assembly. Figure 7 yes Figure 1 Enlarged view of point A in the middle; Figure 8 This is a schematic diagram of the structure of the insert plate of the present invention; Figure 9 This is a schematic diagram of the insert plate of the present invention from another perspective; Figure 10 This is a schematic diagram of the mounting bracket of the present invention; Figure 11 This is a schematic diagram of the structure of the insert plate position adjustment block of the present invention; Figure 12 This is a schematic diagram of the material discharge mechanism of the present invention; Figure 13 This is a schematic diagram of the material discharge mechanism of the present invention from another perspective; Figure 14 yes Figure 12 Enlarged view of point B in the middle. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figure 1 As shown, the present invention is an automatic cardboard packaging and conveying device, including a frame 10, a feeding mechanism 20, a packaging mechanism 40 and a discharging mechanism 50 disposed on the frame along the cardboard conveying direction.

[0018] like Figure 1As shown, the feeding mechanism 20 includes a cardboard conveying trough 30 and a lever assembly 21. The cardboard conveying trough 30 is used to convey multiple sheets of cardboard 7 arranged in a vertical queue. The cardboard conveying trough 30 includes two upper guide rods 301 spaced apart and two lower guide rods 302 spaced apart below the upper guide rods 301. The distance between the two lower guide rods 302 is less than the width of the cardboard, and the top surfaces of the two lower guide rods 302 form a support surface for supporting the cardboard. The distance between the two upper guide rods 301 is adapted to the width of the cardboard. It should be noted that at the beginning of operation, the cardboard needs to be manually laid from the inlet to the outlet of the cardboard conveying trough 30. During operation, the cardboard needs to be continuously conveyed to the inlet of the cardboard conveying trough 30.

[0019] Combination Figure 2 As shown, there are two lever assemblies 21. The two lever assemblies 21 are symmetrically arranged on the frame 10, left and right. Each lever assembly 21 includes a feed plate transverse movement cylinder 26 fixed to the frame 10, a feed plate slide 22 fixed to the output end of the feed plate transverse movement cylinder 26, a feed plate lifting cylinder 23 fixed to the feed plate slide 22, and a feed plate 24 driven to rise and fall by the feed plate lifting cylinder 23. Slide rails 25 are fixed to the left and right sides of the frame 10, respectively. The feed plate slides 22 are fixed to the corresponding slide rails 25. Each feed plate 24 has a groove 241 through which a corresponding lower guide rod 302 passes. The lower guide rod 302 guides the feed plate 24. There is an movable gap between the two feed plates 24, so that when the two feed plates 24 are driven to move horizontally in opposite directions, they do not interfere with each other.

[0020] During operation, one of the lever assemblies 21 acts as the current lever assembly. The feed plate lateral movement cylinder 26 within this assembly is activated, driving the piston rod of the cylinder to move backward, thus moving the feed plate 24 to the inlet of the cardboard conveying trough 30. Subsequently, the feed plate lifting cylinder 23 drives the feed plate 24 to rise and insert between the cardboard sheets arranged in a queue. Then, the feed plate lateral movement cylinder 26 drives the feed plate 24 to return, pushing all the cardboard sheets in front of the feed plate 24 forward. When the piston rod of the feed plate lateral movement cylinder 26 returns to its initial position, the feed plate lifting cylinder 23 drives the feed plate 24 to descend, thus completing one cardboard pushing process. During the process of the current lever assembly pushing the cardboard forward, another lever assembly 21 acts as the new current lever assembly, driving the feed plate 24 to the inlet of the cardboard conveying trough 30, and then the above steps continue sequentially. In this way, the cardboard 7, arranged in a queue, is continuously conveyed to the outlet of the cardboard conveying slot 30 under the alternating push of the two lever assemblies 21.

[0021] Combination Figure 3 , Figure 4 , Figure 7 and Figure 10 As shown, a packaging area is located at the front end of the cardboard conveying trough 30, and a packaging mechanism 40 is disposed within the packaging area. The packaging mechanism 40 is used to first divide the arriving cardboard into cardboard groups 8 according to a preset number of sheets, and then push the divided cardboard groups 8 to the next process. The packaging mechanism 40 includes a reference baffle 41 located at the front of the packaging area, a guide groove 49 located at the rear of the packaging area for guiding the cardboard, a channel 491 located on one side of the packaging area, and a pusher plate 44 located on the other side opposite to the channel 491. A pusher plate cylinder 43 is fixed on the mounting frame 42 above the pusher plate 44 to drive the pusher plate 44 to move towards the channel. An insert plate cylinder 45 and an insert plate 46 driven by the insert plate cylinder 45 to rise and fall are provided above the guide groove 49. A blower blade 47 for blowing air downwards is also provided on the mounting frame 42 above the guide groove 49. A limit sensor 48 is horizontally disposed on the outer side of the reference baffle 41. The reference baffle 41 has a slot 411. The probe of the limit sensor 48 passes through the slot 411 and extends slightly beyond the inner side of the reference baffle 41.

[0022] like Figure 3 and Figure 4 As shown, the guide groove 49 consists of a first guide plate 421 and a second guide plate 422 fixedly and spaced apart on the bottom surface of the mounting bracket 42. The first guide plate 421 and the second guide plate 422 form a temporary storage groove adapted to the cardboard assembly between themselves and the reference baffle 41. The channel 491 consists of a base plate 4911 and a front baffle 4912 and a rear baffle 4913 erected at the front and rear edges of the base plate 4911.

[0023] In this embodiment, combined with Figure 8 and Figure 9 As shown, the lower end of the insert plate 46 has a three-prong plug 460. The thickness of the three-prong plug 460 gradually decreases from top to bottom. This design makes it easier to insert the insert plate into the queue of cardboard and also facilitates its removal.

[0024] When doing homework, combine Figure 5 and Figure 6 As shown, the lever assembly 21 pushes the cardboard in the queue forward, thus giving the cardboard a thrust. When the cardboard at the front of the queue contacts the inner side of the reference baffle, and the thrust acts on the limit sensor and triggers the limit sensor 48 to send a signal, the air-blowing knife 47 starts blowing air, creating a gap between the cardboard in the queue below the air-blowing knife 47. Subsequently, the insert plate cylinder 45 drives the insert plate 46 to descend and insert into the gap, separating the cardboard at the front of the queue to form a cardboard group 8. Then, the push plate cylinder 43 drives the push plate 44 to push the cardboard group 8 towards the channel 491. When the push plate 44 pushes the cardboard group 8 out of the channel 491 and pushes it to the next process, the push plate cylinder 43 drives the push plate 44 to reset, the insert plate cylinder 45 drives the insert plate 46 to rise, and then waits for the next task to be triggered.

[0025] like Figure 3 and Figure 4 As shown, the insert cylinder 45 is fixed to the mounting bracket 42 via the upper bracket 423. A mounting base 451 is fixed to the output end of the insert cylinder 45. The upper end of the insert plate 46 is connected to the lower end of the mounting base 451. A pair of guide rails 452 are fixed to the upper bracket 423. The mounting base 451 is fixed to the guide rails 452.

[0026] Combination Figure 11 As shown, a plate position adjusting block 461 for adjusting the position of the insert plate 46 is provided on the bottom surface of the mounting bracket. The plate position adjusting block 461 includes a horizontal plate 4611, an upper vertical plate 4612 connected to the upper and lower sides of the horizontal plate 4611, and a lower vertical plate 4613. The lower vertical plate 4613 abuts against the rear side of the insert plate 46. A slotted hole 4614 is provided on the horizontal plate 4611. A threaded hole 4615 is provided on the mounting bracket 42 corresponding to the slotted hole 4614. A bolt is provided in the threaded hole 4615, and the end of the bolt passes through the threaded hole 4615 and is screwed into the slotted hole 4614, thereby fixing the plate position adjusting block 461 to the mounting bracket. In this embodiment, there are two slotted holes 4614 and two threaded holes. The number of sheets of cardboard in each cardboard group is controlled by the distance between the insert plate and the reference baffle. This is achieved by adjusting the position of the insert plate using the insert plate position adjustment block 461, which in turn adjusts the distance between the insert plate and the reference baffle, thus controlling the number of sheets of cardboard in each group. To adjust, loosen the bolt, then move the insert plate adjustment block 461 forward and backward. After adjusting the position, tighten the bolt. Furthermore, as... Figure 8 and Figure 11 As shown, a stop 4616 is provided on the bottom surface of the lower vertical plate 4613. The stop 4616 is located above the front end of the cardboard conveying groove 30 and is used to prevent the cardboard from being hooked together and carried upward when the insert plate 46 is pulled out.

[0027] An air knife position adjustment block is also provided between the air knife 47 and the mounting bracket 42. The position of the air knife 47 can be adjusted by adjusting the position of the air knife position adjustment block forward and backward. This is all existing technology and will not be described in detail.

[0028] like Figure 3 and Figure 4 As shown, a mounting opening 4211 is provided on the first guide plate 421. An adjusting block 4212 is inserted into the mounting opening 4211. In this way, the position of the adjusting block 4212 can be adjusted left and right to meet the requirements of packing cardboard of different widths.

[0029] Combination Figures 12-14As shown, the discharge mechanism 50 includes a support base 51, a motor 52 mounted on the support base, a tilting box 53 driven by the motor 52 to swing, a forming pusher plate transverse movement cylinder 55 located below the tilting box 53, a forming pusher plate 54 driven by the forming pusher plate transverse movement cylinder 55 to move laterally, and a positioning sensor 56 fixed to one side of the support base. The tilting box 53 has openings 531 on its top and the side facing the channel, and notches 532 on its bottom and front sides for the forming pusher plate to pass through.

[0030] The discharging mechanism 50 also includes a top-loading cylinder 58 fixed to the rear side of the flip box 53 and a pressure block 57 driven by the top-loading cylinder. The rear side of the flip box 53 has a through hole 533 through which the pressure block 57 can pass. Thus, when the cardboard group 8 is pushed entirely into the receiving cavity of the flip box 53 by the pusher plate 44 from the left opening 531, the top-loading cylinder 58 drives the pressure block 57 to press down the cardboard group. Subsequently, the motor 52 drives the flip box 53 to flip forward 90°. When the positioning sensor 56 senses the flip box 53 and sends a signal, the top material cylinder 58 drives the pressure block 57 to return, releasing the cardboard group. At the same time, the forming push plate lateral movement cylinder 55 is activated, driving the forming push plate 54 to move forward. The forming push plate 54 passes through the notch 532 of the flip box 53 and pushes the cardboard group 8 to the next process. Then, the forming push plate lateral movement cylinder 55 drives the forming push plate to reset, and the motor 52 drives the flip box 53 to reset. Then, it waits for the next task to be triggered.

[0031] During operation, the two lever assemblies 21 alternately push the cardboard in the queue forward, giving the cardboard a thrust. When the cardboard 7 at the front of the queue contacts the inner side of the reference baffle, the thrust acts on the limit sensor and triggers the limit sensor 48 to send a signal. Then, the air blower 47 blows air onto the cardboard in the queue below, creating a gap between the cardboard in the queue. Subsequently, the insert plate cylinder 45 drives the insert plate 46 to descend and insert into the gap, separating the cardboard at the front of the queue to form a cardboard group 8. Then, the push plate cylinder 43 drives the push plate 44 to push the cardboard group 8 towards the channel 491. After that, the push plate 44 pushes the cardboard group 8 out of the channel 491 and pushes it to the flip box 53. Then, the push plate cylinder 43 drives the push plate 44 to reset, the insert plate cylinder 45 drives the insert plate 46 to rise, and then waits for the next task to be triggered.

[0032] When the cardboard group 8 enters the flip box 53, the top material cylinder 58 drives the pressure block 57 to press the cardboard group 8. Then, the motor 52 drives the flip box 53 to flip forward 90°. After that, the top material cylinder 58 drives the pressure block 57 to return and release the cardboard group 8. At the same time, the forming push plate transverse movement cylinder 55 is activated, driving the forming push plate 54 to move forward and push the cardboard group 8 to the next process. Then, the forming push plate transverse movement cylinder 55 drives the forming push plate to reset, the motor 52 drives the flip box 53 to reset, and then waits for the next task to be triggered.

[0033] In summary, the automatic cardboard packaging and conveying device of the present invention can automatically package cardboard according to a predetermined number of sheets, realize uninterrupted production, thereby reducing production costs and improving work efficiency.

[0034] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. An automatic cardboard packaging and conveying device, comprising a frame, a feeding mechanism, a packaging mechanism, and a discharging mechanism arranged sequentially along the cardboard conveying direction on the frame; characterized in that, The feeding mechanism includes a cardboard conveying trough and a lever assembly. The cardboard conveying trough includes two upper guide rods spaced apart and two lower guide rods spaced apart. The distance between the two lower guide rods is less than the width of the cardboard. The top surfaces of the two lower guide rods form a support surface for supporting the cardboard. The distance between the two upper guide rods is adapted to the width of the cardboard. There are two lever assemblies, which are symmetrically arranged on the frame. Each lever assembly includes a feeding plate, a feeding plate lifting cylinder for driving the feeding plate to rise and fall, and a feeding plate horizontal movement cylinder for driving the feeding plate to move horizontally. The feeding plate has a groove that cooperates with the lower guide rod. There is an movable gap between the two feeding plates. A sub-packaging area is located at the front end of the cardboard conveying trough. A sub-packaging mechanism is set within the sub-packaging area. The sub-packaging mechanism includes a reference baffle located at the front of the sub-packaging area, a guide groove located at the rear of the sub-packaging area for guiding the cardboard, a channel located on one side of the sub-packaging area, and a pusher plate located on the opposite side of the channel. A pusher plate cylinder is fixed on a mounting frame above the pusher plate to drive the pusher plate to move towards the channel. An insert plate and an insert plate cylinder for driving the insert plate to rise and fall are located above the guide groove on the mounting frame. An air blowing knife for blowing air downwards is also located above the guide groove. A limit sensor is horizontally arranged on the outer side of the reference baffle. A groove is opened on the reference baffle, and the probe of the limit sensor passes through the groove and slightly extends beyond the inner side of the reference baffle. The guide groove consists of a first guide plate and a second guide plate fixed at intervals on the bottom surface of the mounting frame. The first guide plate and the second guide plate form a temporary storage groove adapted to the cardboard assembly between the reference baffle and the reference baffle. The channel consists of a base plate and a front baffle and a rear baffle vertically arranged at the front and rear edges of the base plate. The discharge mechanism includes a support base, a motor mounted on the support base, a tilting box driven by the motor to swing, a forming push plate transverse movement cylinder located below the tilting box, a forming push plate driven by the forming push plate transverse movement cylinder to move horizontally, and a positioning sensor fixed on one side of the support base. The top and the side facing the channel of the tilting box are provided with openings, and the bottom and front sides are provided with notches for the forming push plate to pass through. It also includes a top material cylinder fixed on the rear side of the tilting box and a pressure block driven by the top material cylinder. The rear side of the tilting box has a through hole for the pressure block to pass through.

2. The automatic cardboard packaging and conveying device according to claim 1, characterized in that, The bottom surface of the mounting bracket is provided with a plate position adjustment block for adjusting the position of the plate. The plate position adjustment block includes a horizontal plate, an upper vertical plate and a lower vertical plate connected to the upper and lower sides of the horizontal plate. The lower vertical plate abuts against the rear side of the plate. The horizontal plate is provided with an oblong hole. The mounting bracket is provided with a threaded hole at the position corresponding to the oblong hole. A bolt is provided in the threaded hole. After the end of the bolt passes through the threaded hole, it is screwed into the oblong hole, thereby fixing the plate position adjustment block on the mounting bracket.

3. The automatic cardboard packaging and conveying device according to claim 2, characterized in that, The bottom surface of the lower vertical plate is provided with a stop above the front end of the cardboard conveying groove.

4. The automatic cardboard packaging and conveying device according to claim 1, characterized in that, The first guide plate has an installation port, and an adjustment block is inserted into the installation port.

5. The automatic cardboard packaging and conveying device according to claim 1, characterized in that, The lower end of the plug has a three-prong plug, the thickness of which gradually decreases from top to bottom.

6. The automatic cardboard packaging and conveying device according to claim 1, characterized in that, Each of the feed plate transverse cylinders has a feed plate slide fixed to its output end. The feed plate lifting cylinder is fixed to the feed plate slide. The left and right sides of the frame are respectively fixed with slide rails, and the feed plate slides are respectively fixed to the corresponding slide rails.

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