High speed tray placing machine

Abstract

The utility model discloses a high -speed swing tray machine, including machine table and set up on the sorting box mechanism and the ejection box mechanism of machine table, the sorting box mechanism includes the blanking channel, translation support board and translation drive module, the blanking channel is along the up and down direction and is thorough, translation drive module connection drive translation support board moves along the horizontal direction to make translation support board enter or leave blanking channel, and then make blanking channel close or open, the ejection box mechanism includes the lifting support board and lifting drive module, and the lifting support board is located blanking channel below, and lifting drive module connection drive lifting support board and lift to make lifting support board close to or away from translation support board. This high -speed swing tray machine can shorten the drop distance of plastic box, thereby reduce the vibration when the plastic box drops, and improve product sorting efficiency.

Description

Technical Field

[0001] This utility model relates to automatic tray-stacking equipment, and more particularly to a high-speed tray-stacking machine. Background Technology

[0002] Chinese Patent Application No. CN202410215438.5 discloses a blister box sorting machine, including a frame and a box feeding mechanism, a material feeding mechanism, a placement and sorting mechanism, a box tray mechanism, and a pallet tray mechanism mounted on the frame. During operation, the placement and sorting mechanism first places the blister boxes from the box feeding mechanism into the box tray mechanism, and then sorts the products to be sorted from the material feeding mechanism into the blister boxes in the box tray mechanism. The box tray mechanism includes two rotating trays and an opening and closing drive device connected to drive the two rotating trays to open and close relative to each other. The pallet tray mechanism includes a support platform and a platform lifting device connected to drive the support platform to rise and fall. When the blister boxes are full of products, the platform lifting device first drives the support platform to rise to a certain height, and then the opening and closing drive device drives the two rotating trays to rotate and open, so that the blister boxes fall from the rotating trays onto the support platform.

[0003] The rotating tray needs to occupy the space below when it rotates, so the supporting platform cannot be raised too high to avoid colliding with the rotating tray. This results in the blister box falling a large distance, and the resulting vibration will shake the product out of the blister box.

[0004] To address this issue, existing technologies add a liftable pick-and-place mechanism to the blister box sorting machine to pick up and place the blister boxes between the tray mechanism and the box mechanism. However, this not only increases equipment costs, but also requires other mechanisms to pause and wait while the pick-and-place mechanism is working, which also affects product sorting efficiency. Utility Model Content

[0005] To address the shortcomings of the existing technology, this utility model provides a high-speed tray sorting machine that can shorten the drop distance of the blister pack, thereby reducing the vibration generated when the blister pack falls and improving product sorting efficiency.

[0006] The technical problem to be solved by this utility model is achieved through the following technical solution: A high-speed tray-loading machine includes a machine base and a sorting tray mechanism and a discharging tray mechanism disposed on the machine base. The sorting tray mechanism includes a feeding channel, a translation tray, and a translation drive module. The feeding channel runs vertically through the material, and the translation drive module drives the translation tray to move horizontally, so that the translation tray enters or leaves the feeding channel, thereby closing or opening the feeding channel. The discharge tray mechanism includes a lifting tray and a lifting drive module. The lifting tray is located below the discharge channel, and the lifting drive module is connected to drive the lifting tray to move up and down so that the lifting tray moves closer to or away from the translation tray.

[0007] Furthermore, there are at least two translation pallets, each translation pallet being evenly arranged around the unloading channel; there are at least two translation drive modules, each translation drive module being connected to drive one translation pallet to move closer to or away from the center of the unloading channel, so that each translation pallet simultaneously enters or leaves the unloading channel.

[0008] Furthermore, the sorting tray mechanism also includes multiple positioning baffles and multiple positioning drive modules. Each positioning baffle is located above the translation tray and surrounds the unloading channel. Each positioning drive module is connected to drive one positioning baffle to move horizontally, so that each positioning baffle moves closer to or away from the center of the unloading channel.

[0009] Furthermore, the positioning baffle located between two adjacent translation pallets includes an upper positioning part and a lower positioning part connected to each other. The upper positioning part is located above the translation pallet, and the lower positioning part is located below the translation pallet.

[0010] Furthermore, the sorting tray mechanism also includes a first support, which is disposed on the machine platform and surrounds the unloading channel; the translation tray is movably disposed below the first support via corresponding guide rails or guide grooves, and each positioning baffle is movably disposed above the first support via corresponding guide rails or guide grooves.

[0011] Furthermore, the sorting tray mechanism also includes a support partition, which is disposed in the middle of the feeding channel to divide the feeding channel into two parallel feeding sub-channels, with its two ends detachably mounted on the first support.

[0012] Furthermore, the lifting drive module includes a second bracket, a lifting driver, a lifting connecting plate, and multiple lifting guide rods. The second bracket is mounted on the machine base. The lifting tray is located above the second bracket, and the lifting connecting plate is located below the second bracket. Each lifting guide rod is vertically and vertically inserted into the second bracket, with its upper end fixedly connected to the lifting tray and its lower end fixedly connected to the lifting connecting plate. The lifting driver is mounted on the second bracket and drives the lifting tray to move up and down.

[0013] Furthermore, the high-speed tray-loading machine also includes an empty box feeding mechanism and a product feeding mechanism disposed on the machine platform. The empty box feeding mechanism and the product feeding mechanism are respectively disposed on opposite sides of the sorting tray mechanism and the discharge tray mechanism in the horizontal direction. The empty box feeding mechanism is used to feed and place the blister boxes into the sorting tray mechanism, and the product feeding mechanism is used to feed and sort the products to be sorted into the blister boxes of the sorting tray mechanism.

[0014] Furthermore, the empty box feeding mechanism includes an empty box hopper module, an empty box suction cup module, and an empty box moving module. The empty box moving module drives the empty box suction cup module to move between the empty box hopper module and the sorting tray mechanism, so that the empty box suction cup module picks up the blister box from the empty box hopper module and places the picked-up blister box into the sorting tray mechanism. The product loading mechanism includes a product feeding module, a product suction cup module, and a product moving module. The product moving module drives the product suction cup module to move between the product feeding module and the sorting tray mechanism, so that the product suction cup module picks up the product to be sorted from the product feeding module and places the picked-up product into the blister box of the sorting tray mechanism.

[0015] Furthermore, the high-speed tray-loading machine also includes a horizontal guide rail mechanism, which is located above the empty box feeding mechanism, the product feeding mechanism, and the sorting tray mechanism. The empty box suction cup module and the product suction cup module are movably mounted on the horizontal guide rail mechanism. The empty box moving module drives the empty box suction cup module to move along the horizontal guide rail mechanism, and the product moving module drives the product suction cup module to move along the horizontal guide rail mechanism.

[0016] This utility model has the following beneficial effects: The high-speed tray-swiping machine of this utility model uses the horizontal movement of the translational pallet to close or open the feeding channel. After the translational pallet moves into the feeding channel, the blister box can be supported on the translational pallet. After the translational pallet moves away from the feeding channel, the blister box can fall through the feeding channel onto the lifting pallet. Since the translational pallet does not need to occupy the space below when it moves horizontally, the lifting height of the lifting pallet is greatly improved, which can further shorten the falling distance of the blister box, thereby reducing the vibration generated when the blister box falls. It also eliminates the need to set up a special picking and placing mechanism between the sorting pallet mechanism and the discharging pallet mechanism, which can reduce equipment costs and improve product sorting efficiency. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of the high-speed plate-swivel machine provided by this utility model.

[0018] Figure 2 This is a schematic diagram of the sorting tray mechanism and the discharge tray mechanism in the high-speed tray machine provided by this utility model.

[0019] Figure 3 This is a schematic diagram of another structure of the sorting tray mechanism in the high-speed tray machine provided by this utility model.

[0020] Figure 4 A schematic diagram of the discharge tray mechanism in the high-speed swivel tray machine provided by this utility model.

[0021] Figure 5 A schematic diagram of another high-speed plate-swivel machine provided by this utility model. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," and "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Example 1 like Figure 1 As shown, a high-speed tray-dispensing machine includes a machine base 1 and a sorting tray mechanism 3 and a discharging tray mechanism 4 disposed on the machine base 1. The sorting tray mechanism 3 is used to support the blister box a when sorting products, and the discharging tray mechanism 4 is used to support the blister box a when discharging products.

[0027] like Figure 2 As shown, the sorting tray mechanism 3 includes a feeding channel 30, a translation tray 32, and a translation drive module 33. The feeding channel 30 runs through the vertical direction, and the translation drive module 33 drives the translation tray 32 to move horizontally, so that the translation tray 32 enters or leaves the feeding channel 30, thereby closing or opening the feeding channel 30. The discharge tray mechanism 4 includes a lifting tray 41 and a lifting drive module 42. The lifting tray 41 is located below the discharge channel 30. The lifting drive module 42 drives the lifting tray 41 to move up and down, so that the lifting tray 41 moves closer to or away from the translation tray 32.

[0028] The high-speed tray-loading machine of this utility model uses the horizontal movement of the translational pallet 32 ​​to close or open the unloading channel 30. After the translational pallet 32 ​​moves into the unloading channel 30, the blister box a can be supported on the translational pallet 32. After the translational pallet 32 ​​moves away from the unloading channel 30, the blister box a can fall onto the lifting pallet 41 through the unloading channel 30. Since the translational pallet 32 ​​does not need to occupy the space below when it moves horizontally, the lifting height of the lifting pallet 41 is greatly improved, which can further shorten the falling distance of the blister box a, thereby reducing the vibration generated when the blister box a falls. It also eliminates the need to set up a special picking and placing mechanism between the sorting pallet mechanism 3 and the unloading pallet mechanism 4, which can reduce equipment costs and improve product sorting efficiency.

[0029] During sorting and traying, packaging boxes can be placed on the lifting pallet 41 first, and then blister packs a filled with products can be stacked inside the packaging boxes. In this case, the lifting drive module 42 drives the lifting pallet 41 to the same height each time, so that the packaging boxes are as close as possible to the translation pallet 32, or even in close contact with the translation pallet 32. Alternatively, packaging boxes can be left unplaced, and blister packs a filled with products can be directly stacked on the lifting pallet 41. In this case, the lifting drive module 42 initially drives the lifting pallet 41 to its maximum height, so that the lifting pallet 41 is as close as possible to the translation pallet 32, or even in close contact with the translation pallet 32. After each layer of stacked blister packs a is placed on the lifting pallet 41, the lifting drive module 42 drives the lifting pallet 41 to descend a predetermined height, so that the top layer of blister packs a is as close as possible to the translation pallet 32, or even in close contact with the translation pallet 32.

[0030] In this embodiment, there are two sets of sorting tray mechanism 3 and discharging tray mechanism 4. The two sets of sorting tray mechanism 3 and discharging tray mechanism 4 are arranged side by side in the horizontal direction to realize the synchronous sorting of two products to be sorted, thereby further improving the product sorting efficiency.

[0031] The number of translation pallets 32 is at least two, and each translation pallet 32 ​​is evenly arranged around the unloading channel 30; the number of translation drive modules 33 is at least two, and each translation drive module 33 is connected to drive one translation pallet 32 ​​to move closer to or away from the center of the unloading channel 30, so that each translation pallet 32 ​​enters or leaves the unloading channel 30 at the same time.

[0032] When each of the translation pallets 32 moves closer to the center of the feeding channel 30 to enter the feeding channel 30 simultaneously, the feeding channel 30 is in a closed state, and the blister box a cannot pass through the feeding channel 30. When each of the translation pallets 32 moves away from the center of the feeding channel 30 to leave the feeding channel 30 simultaneously, the feeding channel 30 is in an open state, and the blister box a can pass through the feeding channel 30.

[0033] In this embodiment, there are two translation pallets 32, and the interval angle between the two translation pallets 32 is 180°. If there are three translation pallets 32, the interval angle between the three translation pallets 32 is 120°; if there are four translation pallets 32, the interval angle between the four translation pallets 32 is 90°, and so on. Each translation drive module 33 includes two translation cylinders, which are respectively connected to both ends of the corresponding translation pallet 32 ​​to jointly drive the corresponding translation pallet 32.

[0034] The sorting tray mechanism 3 also includes multiple positioning baffles 34 and multiple positioning drive modules 35. Each positioning baffle 34 is located above the translation tray 32 and surrounds the unloading channel 30. Each positioning drive module 35 is connected to drive a positioning baffle 34 to move horizontally, so that each positioning baffle 34 moves closer to or away from the center of the unloading channel 30, thereby pushing the blister box a on the translation tray 32 to move, and thus adjusting the relative position of the blister box a and the lifting tray 41 in the horizontal direction.

[0035] In this embodiment, there are four positioning baffles 34, with a 90° interval between them. The four positioning baffles 34 are located on the front, back, left, and right sides of the feeding channel 30, respectively, to position the blister pack a on the translation tray 32 from these four directions. Each positioning drive module 35 includes two positioning cylinders, each connected to both ends of the corresponding positioning baffle 34 to jointly drive the corresponding positioning baffle 34.

[0036] Of course, the number of positioning baffles 34 can also be increased to position the blister box a on the translation tray 32 from more directions.

[0037] Preferably, the positioning baffle 34 located between two adjacent translation pallets 32 includes an upper positioning part 341 and a lower positioning part 342 connected to each other. The upper positioning part 341 is located above the translation pallet 32 ​​and is used to position the blister box a on the translation pallet 32. The lower positioning part 342 is located below the translation pallet 32 ​​and is used to position the packaging box or the uppermost blister box a on the lifting pallet 41.

[0038] like Figure 4 As shown, the lifting plate 41 has at least one notch 410 on its edge corresponding to the lower positioning part 342. When the lifting plate 41 is raised to its maximum height, each lower positioning part 342 enters the corresponding notch 410.

[0039] The sorting tray mechanism 3 also includes a first support 31, which is disposed on the machine base 1 and surrounds the unloading channel 30; the translation tray 32 is movably disposed below the first support 31 via corresponding guide rails or guide grooves, and each positioning baffle 34 is movably disposed above the first support 31 via corresponding guide rails or guide grooves.

[0040] Preferred, such as Figure 3As shown, the sorting tray mechanism 3 also includes a support partition 36, which is disposed in the middle of the unloading channel 30 to divide the unloading channel 30 into two parallel unloading sub-channels 301, the two ends of which are detachably installed on the first support 31.

[0041] When each sorting tray mechanism 3 only needs to sort one product at a time, the support partition 36 can be removed from the first support 31, and a single blister box a with a size adapted to the unloading channel 30 can be placed on the translation tray 32 for product sorting. When each sorting tray mechanism 3 needs to sort two products at a time, the support partition 36 can be installed on the first support 31, and two blister boxes a with a size adapted to the unloading sub-channel 301 can be placed on the translation tray 32 for product sorting.

[0042] Preferably, the two sorting tray mechanisms 3 are arranged side by side along the first horizontal direction, and the two feeding sub-channels 301 in each sorting tray mechanism 3 are arranged side by side along the second horizontal direction, so as to finally realize the synchronous sorting of the four products to be sorted, wherein the first horizontal direction is perpendicular to the second horizontal direction.

[0043] like Figure 4 As shown, the lifting drive module 42 includes a second bracket 421, a lifting driver 422, a lifting connecting plate 423, and multiple lifting guide rods 424. The second bracket 421 is mounted on the machine base 1. The lifting pallet 41 is located above the second bracket 421, and the lifting connecting plate 423 is located below the second bracket 421. Each lifting guide rod 424 is vertically and vertically inserted into the second bracket 421, with its upper end fixedly connected to the lifting pallet 41 and its lower end fixedly connected to the lifting connecting plate 423. The lifting driver 422 is mounted on the second bracket 421 and drives the lifting pallet 41 to move up and down.

[0044] The lifting drive 422 includes a drive motor, a lead screw assembly, a transmission belt, and a transmission wheel. The drive motor and the lead screw assembly are both mounted on the second bracket 421. The lead screw assembly is connected to the lifting support plate 41. The drive motor is connected to the lead screw assembly via the transmission belt and the transmission wheel.

[0045] To improve the stability of each lifting guide rod 424, preferably, the second bracket 421 includes an upper fixed plate, a lower fixed plate, and multiple connecting side plates. The upper fixed plate and the lower fixed plate are arranged opposite each other vertically, and each connecting side plate is connected between the upper fixed plate and the lower fixed plate. Each lifting guide rod 424 passes through the upper fixed plate and the lower fixed plate, and is connected to the upper fixed plate and the lower fixed plate respectively through corresponding linear bearings.

[0046] Example 2 As an optimization of Embodiment 1, in this embodiment, such as Figure 5 As shown, the high-speed tray loading machine also includes an empty box feeding mechanism 2 and a product feeding mechanism 5 disposed on the machine base 1. The empty box feeding mechanism 2 and the product feeding mechanism 5 are respectively disposed on opposite sides of the sorting tray mechanism 3 and the discharge tray mechanism 4 in the horizontal direction. The empty box feeding mechanism 2 is used to feed and place the blister box a into the sorting tray mechanism 3, and the product feeding mechanism 5 is used to feed and sort the product to be sorted into the blister box a of the sorting tray mechanism 3.

[0047] The empty box feeding mechanism 2 includes an empty box hopper module 21, an empty box suction cup module 22, and an empty box moving module 23. The empty box moving module 23 drives the empty box suction cup module 22 to move between the empty box hopper module 21 and the sorting tray mechanism 3, so that the empty box suction cup module 22 picks up the blister box a from the empty box hopper module 21 and places the picked-up blister box a into the sorting tray mechanism 3.

[0048] The product loading mechanism 5 includes a product feeding module 51, a product suction cup module 52, and a product moving module 53. The product moving module 53 drives the product suction cup module 52 to move between the product feeding module 51 and the sorting tray mechanism 3, so that the product suction cup module 52 picks up the product to be sorted from the product feeding module 51 and places the picked-up product into the blister box a of the sorting tray mechanism 3.

[0049] The high-speed tray-loading machine also includes a horizontal guide rail mechanism 6, which is located above the empty box feeding mechanism 2, the product feeding mechanism 5, and the sorting tray mechanism 3. The empty box suction cup module 22 and the product suction cup module 52 are movably mounted on the horizontal guide rail mechanism 6. The empty box moving module 23 drives the empty box suction cup module 22 to move along the horizontal guide rail mechanism 6, and the product moving module 53 drives the product suction cup module 52 to move along the horizontal guide rail mechanism 6. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present utility model, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the present utility model.

Claims

1. A high-speed tray-loading machine, comprising a machine base and a sorting tray mechanism and a discharging tray mechanism disposed on the machine base, characterized in that, The sorting tray mechanism includes a feeding channel, a translation tray, and a translation drive module. The feeding channel runs vertically through the material, and the translation drive module drives the translation tray to move horizontally, so that the translation tray enters or leaves the feeding channel, thereby closing or opening the feeding channel. The discharge tray mechanism includes a lifting tray and a lifting drive module. The lifting tray is located below the discharge channel, and the lifting drive module is connected to drive the lifting tray to move up and down so that the lifting tray moves closer to or away from the translation tray.

2. The high-speed plate-spinning machine according to claim 1, characterized in that, The number of translation pallets is at least two, and each translation pallet is evenly arranged around the unloading channel; the number of translation drive modules is at least two, and each translation drive module is connected to drive one translation pallet to move closer to or away from the center of the unloading channel, so that each translation pallet enters or leaves the unloading channel at the same time.

3. The high-speed plate-spinning machine according to claim 1 or 2, characterized in that, The sorting tray mechanism also includes multiple positioning baffles and multiple positioning drive modules. Each positioning baffle is located above the translation tray and surrounds the unloading channel. Each positioning drive module is connected to drive a positioning baffle to move horizontally, so that each positioning baffle moves closer to or away from the center of the unloading channel.

4. The high-speed plate-spinning machine according to claim 3, characterized in that, The positioning baffle located between two adjacent translation pallets includes an upper positioning part and a lower positioning part connected to each other. The upper positioning part is located above the translation pallet, and the lower positioning part is located below the translation pallet. The edge of the lifting pallet is provided with at least one notch corresponding to the lower positioning part. When the lifting pallet is raised to its maximum height, each lower positioning part enters the corresponding notch.

5. The high-speed plate-spinning machine according to claim 4, characterized in that, The sorting tray mechanism further includes a first support, which is disposed on the machine platform and surrounds the unloading channel; the translation tray is movably disposed below the first support, and the positioning baffle is movably disposed above the first support.

6. The high-speed plate-spinning machine according to claim 5, characterized in that, The sorting tray mechanism also includes a support partition, which is disposed in the middle of the feeding channel to divide the feeding channel into two parallel feeding sub-channels, with its two ends detachably mounted on the first support.

7. The high-speed plate-spinning machine according to claim 1, characterized in that, The lifting drive module includes a second bracket, a lifting driver, a lifting connecting plate, and multiple lifting guide rods. The second bracket is mounted on the machine platform. The lifting pallet is located above the second bracket, and the lifting connecting plate is located below the second bracket. Each lifting guide rod is vertically and vertically inserted into the second bracket, with its upper end fixedly connected to the lifting pallet and its lower end fixedly connected to the lifting connecting plate. The lifting driver is mounted on the second bracket and drives the lifting pallet to move up and down.

8. The high-speed plate-spinning machine according to claim 1, characterized in that, The high-speed tray-loading machine also includes an empty box feeding mechanism and a product feeding mechanism disposed on the machine platform. The empty box feeding mechanism and the product feeding mechanism are respectively disposed on opposite sides of the sorting tray mechanism and the discharge tray mechanism in the horizontal direction. The empty box feeding mechanism is used to feed and place blister boxes into the sorting tray mechanism, and the product feeding mechanism is used to feed and sort the products to be sorted into the blister boxes of the sorting tray mechanism.

9. The high-speed plate-spinning machine according to claim 8, characterized in that, The empty box feeding mechanism includes an empty box hopper module, an empty box suction cup module, and an empty box moving module. The empty box moving module drives the empty box suction cup module to move between the empty box hopper module and the sorting tray mechanism, so that the empty box suction cup module picks up the blister box from the empty box hopper module and places the picked-up blister box into the sorting tray mechanism. The product feeding mechanism includes a product feeding module, a product suction cup module, and a product moving module. The product moving module drives the product suction cup module to move between the product feeding module and the sorting tray mechanism, so that the product suction cup module picks up the product to be sorted from the product feeding module and places the picked-up product into the blister box of the sorting tray mechanism.

10. The high-speed plate-spinning machine according to claim 9, characterized in that, The high-speed tray-loading machine also includes a horizontal guide rail mechanism, which is located above the empty box feeding mechanism, the product feeding mechanism, and the sorting tray mechanism. The empty box suction cup module and the product suction cup module are movably mounted on the horizontal guide rail mechanism. The empty box moving module drives the empty box suction cup module to move along the horizontal guide rail mechanism, and the product moving module drives the product suction cup module to move along the horizontal guide rail mechanism.

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