Automatic feeding equipment

Abstract

The invention provides automatic feeding equipment. The automatic feeding equipment comprises a feeding mechanism, a material receiving and lifting mechanism, a transferring mechanism, a material taking gripper mechanism and a foundation frame. The material receiving lifting mechanism, the transferring mechanism and the material taking gripper mechanism are all installed on the foundation frame. The feeding mechanism comprises a feeding support and a feeding track, and the feeding track is arranged on the feeding support and used for conveying the storage box; a recycling station is formed at the top of the feeding bracket; the receiving and lifting mechanism is used for receiving and lifting the storage boxes conveyed by the feeding mechanism; the transferring mechanism is installed on the foundation frame, the material taking gripper mechanism is connected to the top of the foundation frame in a sliding mode, the material taking gripper mechanism is further connected with a synchronous belt of the transferring mechanism, and conveying of the transferring mechanism to the material taking gripper mechanism is achieved. The product and the storage box are transferred to the designated position through automatic operation, installation work is completed, and the working efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of automation equipment, and in particular relates to an automatic feeding equipment. Background Art

[0002] During the production and installation of fuel filler caps, they need to be installed one by one by a robot. The fuel filler caps are placed in batches on pallets, and then the pallets are placed into storage boxes layer by layer. In order to cooperate with the robot to realize automated operation, the pallet and storage box with the fuel filler caps need to be transported to the designated location. After the robot takes away the fuel filler caps, the empty pallets are collected and put into the recycling box, and then the empty storage boxes are uniformly processed. In order to improve production efficiency, how to realize automated operation of the above work is an urgent problem to be solved. Summary of the invention

[0003] In view of this, the present invention aims to provide an automatic feeding device to solve the above problems.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] An automatic feeding device comprises a feeding mechanism, a material receiving and lifting mechanism, a transfer mechanism, a material taking and grabbing mechanism and a basic frame; the material receiving and lifting mechanism, the transfer mechanism and the material taking and grabbing mechanism are all installed on the basic frame;

[0006] The feeding mechanism is arranged at one end of the basic frame, and a material taking station is arranged at the other end of the basic frame; a material receiving and lifting mechanism is arranged between the feeding mechanism and the material taking station;

[0007] The feeding mechanism includes a feeding bracket and a feeding track. The feeding track is arranged on the feeding bracket. The feeding track is arranged obliquely for conveying the storage box. A recycling station is formed on the top of the feeding bracket.

[0008] The receiving and lifting mechanism is arranged on one side of the feeding mechanism, and is used to receive and lift the storage box transmitted by the feeding mechanism;

[0009] The transfer mechanism is installed on the basic frame, the material grabbing gripper mechanism is slidably connected to the top of the basic frame, and the material grabbing gripper mechanism is also connected to the synchronous belt of the transfer mechanism, so that the transfer mechanism transmits the material grabbing gripper mechanism; the material grabbing gripper mechanism is used to suck the pallet.

[0010] Furthermore, the feeding bracket is composed of profiles, and a blocking component is provided on the feeding bracket, and the blocking component is used to block the storage box passing through the feeding track; the blocking component includes a blocking cylinder and a blocking plate, and the blocking plate is installed to the output end of the blocking cylinder.

[0011] Furthermore, the material receiving and lifting mechanism includes a material receiving component and a lifting component;

[0012] The lifting assembly includes a lifting slide rail, a lifting motor and a lifting screw; the lifting slide rail is installed on the basic frame, the lifting motor and the lifting screw are also installed on the basic frame, and the lifting screw is connected to the output end of the lifting motor; the material receiving assembly is connected to the lifting slide rail through a slider, and the material receiving assembly is also threadedly connected to the lifting screw through a nut seat to achieve the lifting and lowering of the material receiving assembly.

[0013] Furthermore, the material receiving assembly includes a receiving bottom plate, a receiving top plate, a receiving cylinder and a receiving limit assembly; the receiving top plate is hinged to one end of the receiving bottom plate, and a receiving cylinder is provided between the receiving top plate at the other end and the receiving bottom plate, and the receiving cylinder can lift the receiving top plate; the raised receiving top plate can be connected to the feeding track.

[0014] Furthermore, a surrounding plate is provided on the upper surface of the receiving top plate, and a receiving limit assembly is also provided on one side of the receiving top plate; the receiving limit assembly includes an X-direction limit cylinder, a Y-direction limit cylinder and a receiving limit plate;

[0015] The X-direction limit cylinder is installed to the lower surface of the end of the receiving top plate away from the hinge point, the Y-direction limit cylinder is installed to the output end of the X-direction limit cylinder, and the receiving limit plate is installed to the output end of the Y-direction limit cylinder to achieve the limitation of the storage box entering the receiving top plate.

[0016] Furthermore, the transfer assembly includes a transfer motor and a synchronous belt; the transfer motor is installed on a basic frame, and a driving wheel and a driven wheel are respectively provided at both ends of the basic frame, and the driving wheel and the driven wheel are connected by a synchronous belt; the output end of the transfer motor is connected to the driving wheel; and transfer slide rails are provided on both sides of the top of the basic frame.

[0017] Furthermore, the material grabbing gripper mechanism comprises a vertical moving assembly and a gripper assembly; a bottom plate is provided at the bottom of the vertical moving assembly, and the bottom plate is connected to the transfer slide rail via a transfer slider;

[0018] The bottom of the base plate is also fixedly connected to the synchronous belt through a fixing piece to achieve lateral driving of the vertical moving component;

[0019] The gripper assembly is installed on the moving end of the vertical moving assembly through a connecting frame to achieve the up and down movement of the gripper assembly.

[0020] Further, the gripper assembly includes a gripper integrated frame, a gripper body and an adjustment plate;

[0021] The gripper integrated frame is composed of profiles, and a plurality of gripper bodies are connected to the gripper integrated frame through an adjustment plate; an oblong groove is provided on the adjustment plate to adjust the position of the gripper body.

[0022] Furthermore, the gripper body is connected to the adjustment plate via an extension rod; the gripper body and the extension rod are connected via an angle adjustment member to achieve adjustment of the angle of the gripper body.

[0023] Furthermore, the gripper body includes an outer tube, an inner tube and a suction cup; the inner tube is sleeved onto the outer tube, a spring is provided between the inner tube and the outer tube, a suction cup is provided at one end of the inner tube, and the other end is connected to an air source.

[0024] Compared with the prior art, the automatic feeding equipment described in the present invention has the following advantages:

[0025] (1) The present invention provides an automatic loading device, which is designed with an inclined slide rail to move the storage box by gravity and then lift the storage box to a specified position.

[0026] Then the products in the storage box are transferred to cooperate with the subsequent work, and the operation is automated to improve work efficiency.

[0027] (2) The present invention provides an automatic loading device, which completes the storage limit by receiving the limit component to avoid shaking and facilitate the subsequent absorption of the tray;

[0028] (3) The present invention provides an automated loading device that can accurately absorb a pallet and then transport the pallet to a designated location through a transfer mechanism to complete automated operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of an automatic feeding device according to an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of the cooperation between the feeding mechanism and the material receiving and lifting mechanism according to the embodiment of the present invention Figure 1 ;

[0032] Figure 3 Schematic diagram of the cooperation between the feeding mechanism and the material receiving and lifting mechanism according to the embodiment of the present invention Figure 2 ;

[0033] Figure 4 Schematic diagram of the material receiving assembly according to the embodiment of the present invention Figure 1 ;

[0034] Figure 5 Schematic diagram of the material receiving assembly according to the embodiment of the present invention Figure 2 ;

[0035] Figure 6 It is a schematic diagram of the cooperation between the transfer mechanism and the material grabbing gripper mechanism according to an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of a gripper assembly according to an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of a gripper body according to an embodiment of the present invention.

[0038] Fig. 9 This is a cross-sectional view of the gripper body described in an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1. Feeding mechanism; 11. Feeding bracket; 12. Feeding track; 13. Blocking assembly; 2. Material receiving and lifting mechanism; 21. Material receiving assembly; 211. Receiving bottom plate; 212. Receiving top plate; 213. Receiving cylinder; 214. Receiving limit assembly; 2141. X-axis limit cylinder; 2142. Y-axis limit cylinder; 2143. Receiving limit plate; 22. Lifting assembly; 221. Basic frame; 222. Lifting slide rail; 223. Lifting motor ; 224, lifting screw; 3, transfer mechanism; 31, transfer motor; 32, synchronous belt; 33, transfer slide rail; 4, material picking gripper mechanism; 41, vertical moving assembly; 42, gripper assembly; 421, gripper integrated frame; 422, gripper body; 4221, outer tube; 4222, inner tube; 4223, suction cup; 4224, spring; 423, adjustment plate; 424, extension rod; 43, bottom plate; 5, feeding station; 6, recycling station. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0045] An automatic feeding device, such as Figure 1-Figure 9 As shown, it includes a feeding mechanism 1, a material receiving and lifting mechanism 2, a transfer mechanism 3, a material taking and grabbing mechanism 4 and a basic frame 221; the material receiving and lifting mechanism 2, the transfer mechanism 3, and the material taking and grabbing mechanism 4 are all installed on the basic frame 221;

[0046] The feeding mechanism 1 is arranged at one end of the basic frame 221, and a material taking station is arranged at the other end of the basic frame 221; a material receiving and lifting mechanism 2 is arranged between the feeding mechanism 1 and the material taking station;

[0047] The feeding mechanism 1 includes a feeding bracket 11 and a feeding track 12. The feeding track 12 is arranged on the feeding bracket 11. The feeding track 12 is inclined and is used to transport the storage box. The top of the feeding bracket 11 forms a recycling station 6.

[0048] The receiving and lifting mechanism 2 is arranged on one side of the feeding mechanism 1, and is used to receive and lift the storage box transmitted by the feeding mechanism 1;

[0049] The transfer mechanism 3 is installed on the base frame 221, and the material grabbing mechanism 4 is slidably connected to the top of the base frame 221. The material grabbing mechanism 4 is also connected to the synchronous belt 32 of the transfer mechanism 3, so that the transfer mechanism 3 can transfer the material grabbing mechanism 4; the material grabbing mechanism 4 is used to suck the pallet;

[0050] The transfer mechanism 3 enables the material grabbing gripper mechanism 4 to move and transform between the material grabbing station, the material receiving and lifting mechanism 2 and the recycling station 6 .

[0051] The feeding mechanism 1, the material receiving and lifting mechanism 2, the transfer mechanism 3, and the material taking gripping mechanism 4 are all connected to the controller.

[0052] Preferably, the feeding bracket 11 is composed of profiles, and a blocking component 13 is provided on the feeding bracket 11, and the blocking component 13 is used to block the storage box passing through the feeding track 12;

[0053] The blocking assembly 13 includes a blocking cylinder and a blocking plate, which is mounted to the output end of the blocking cylinder; the blocking plate acts on the rear end of the storage box to control the storage box to enter the assembly line in sequence.

[0054] Preferably, the material receiving and lifting mechanism 2 includes a material receiving component 21 and a lifting component 22;

[0055] The lifting assembly 22 includes a base frame 221, a lifting rail 222, a lifting motor 223 and a lifting screw 224; the lifting rail 222 is mounted on the base frame 221, the lifting motor 223 and the lifting screw 224 are also mounted on the base frame 221, and the lifting screw 224 is connected to the output end of the lifting motor 223;

[0056] The material receiving assembly 21 is connected to the lifting slide rail 222 through a slider, and the material receiving assembly 21 is also threadedly connected to the lifting screw 224 through a nut seat to achieve the lifting and lowering of the material receiving assembly 21.

[0057] The lifting motor 223 is connected to the controller, and the controller controls the lifting motor 223 to work, and then the material receiving assembly 21 rises;

[0058] Preferably, the material receiving assembly 21 includes a receiving bottom plate 43211, a receiving top plate 212, a receiving cylinder 213 and a receiving limit assembly 214; the receiving top plate 212 is hinged to one end of the receiving bottom plate 43211, and a receiving cylinder 213 is provided between the receiving top plate 212 and the receiving bottom plate 43211 at the other end, and the receiving cylinder 213 can lift the receiving top plate 212; the receiving bottom plate 43211 is connected to the lifting screw 224 through a nut seat, thereby realizing the overall lifting of the material receiving assembly 21; the receiving cylinder 213 is connected to the controller.

[0059] The raised receiving top plate 212 can be connected to the feeding track 12 , so that the storage box can finally enter the receiving top plate 212 .

[0060] Preferably, a surrounding plate is provided on the upper surface of the receiving top plate 212, and a receiving limit assembly 214 is also provided on one side of the receiving top plate 212; the surrounding plate is in a semi-enclosed form, allowing the storage box to enter first, and then the storage box is limited by the receiving limit assembly 214; a buffer rod is also provided on the surrounding plate at the end, and a buffering effect is provided when the storage box enters and directly contacts the receiving box; two rows of pulleys are also provided on the surface of the receiving top plate 212 to reduce the friction of the storage box.

[0061] The receiving limit assembly 214 includes an X-axis limit cylinder 2141, a Y-axis limit cylinder 2142 and a receiving limit plate 2143, which realize position adjustment in the X and Y directions. The receiving limit assembly 214 is connected to a controller.

[0062] The X-axis limit cylinder 2141 is installed to the lower surface of the end of the receiving top plate 212 away from the hinge point, the Y-axis limit cylinder 2142 is installed to the output end of the X-axis limit cylinder 2141, and the receiving limit plate 2143 is installed to the output end of the Y-axis limit cylinder 2142; the storage box entering the receiving top plate is limited; the upper part of the receiving top plate 212 is also provided with an infrared sensor, which is connected to the controller for detecting whether the storage box enters.

[0063] The storage box with the oil tank cover is transmitted from the feeding track 12. At this time, the receiving top plate 212 of the receiving assembly 21 is lifted, and the storage box enters the receiving top plate 212. Then the controller controls the receiving top plate to be leveled, and then controls the lifting assembly 22 to work, and lifts the receiving assembly 21 loaded with the storage box to the specified position.

[0064] Preferably, the transfer assembly includes a transfer motor 31 and a synchronous belt 32; the transfer motor 31 is installed on the base frame 221, and a driving wheel and a driven wheel are respectively provided at both ends of the base frame 221, and the driving wheel and the driven wheel are connected by a synchronous belt 32; the output end of the transfer motor 31 is connected to the driving wheel; the transfer motor 31 drives the synchronous belt 32 to move when it works, and then drives the material grabbing gripper mechanism 4 to move; transfer slide rails 33 are provided on both sides of the top of the base frame 221.

[0065] Preferably, the material grabbing gripper mechanism 4 comprises a vertical moving component 41 and a gripper component 42; the vertical moving component 41 is a linear module capable of realizing vertical movement;

[0066] The bottom of the vertical moving assembly 41 is provided with a bottom plate 43, which is connected to the transfer slide rail 33 through a transfer slider; the bottom of the bottom plate 43 is also fixedly connected to the synchronous belt 32 through a fixing member, so as to realize the lateral drive of the vertical moving assembly 41;

[0067] The gripper assembly 42 is mounted on the moving end of the vertical moving assembly 41 via a connecting frame to achieve the up and down movement of the gripper assembly 42 .

[0068] Preferably, the gripper assembly 42 includes a gripper integrated frame 421, a gripper body 422 and an adjustment plate 423; the gripper integrated frame 421 is composed of profiles, and a plurality of gripper bodies 422 are connected to the gripper integrated frame 421 through an adjustment plate 423; an oblong groove is provided on the adjustment plate 423 to adjust the position of the gripper body 422; it can be easily adjusted to ensure that the pallet can be accurately sucked.

[0069] Preferably, the gripper body 422 is connected to the adjustment plate 423 via an extension rod 424; the gripper body 422 and the extension rod 424 are connected via an angle adjustment piece to adjust the angle of the gripper body 422. The angle adjustment piece is a commercially available piece that can adapt the gripper body 422 to different working environments and working conditions.

[0070] Preferably, the gripper body 422 includes an outer tube 4221, an inner tube 4222 and a suction cup 4223; the inner tube 4222 is sleeved on the outer tube 4221, a spring 4224 is provided between the inner tube 4222 and the outer tube 4221, a suction cup 4223 is provided at one end of the inner tube 4222, and the other end is connected to an air source, so as to realize the suction of the pallet; and by providing the spring 4224, when the gripper body 422 falls, it can play a buffering role to protect the equipment and the pallet.

[0071] During operation, the material grabbing gripper mechanism 4 is used to grab the pallet, and after the grabbing is completed, the position is changed by the action of the transfer component and moved to the specified position.

[0072] Working principle: the trays with fuel filler caps are loaded into the storage box layer by layer, and then transported to the receiving top plate 212 of the receiving assembly 21 by the feeding mechanism 1;

[0073] The controller controls the lifting assembly 22 to work, so that the storage box is lifted to the specified position. After reaching the specified position, the controller controls the transfer mechanism 3 to move the material grabbing mechanism 4 to the position corresponding to the material receiving and lifting mechanism 2. The material grabbing mechanism 4 sucks the tray in the storage box. After the suction is completed, it moves to the material grabbing station under the drive of the transfer mechanism 3, and then puts it on the material grabbing station;

[0074] The robot takes the products in the tray one by one for installation. After the installation is completed, the material grabber mechanism 4 sucks the empty tray, and then moves it to the recycling station 6 under the drive of the transfer mechanism 3 and puts it into the storage box of the recycling station 6.

[0075] Then continue to return to the material receiving and lifting mechanism 2, suck up the pallet of the next layer and repeat the above steps. After all the pallet operations are completed, the material picking gripper mechanism 4 sucks up the empty storage box and moves it to the recycling station 6, continues to transport the products of the next storage box, and repeats the above steps.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic feeding device, characterized in that: It includes a feeding mechanism, a material receiving and lifting mechanism, a transfer mechanism, a material taking and grabbing mechanism and a basic frame; the material receiving and lifting mechanism, the transfer mechanism and the material taking and grabbing mechanism are all installed on the basic frame; The feeding mechanism is arranged at one end of the basic frame, and a material taking station is arranged at the other end of the basic frame; a material receiving and lifting mechanism is arranged between the feeding mechanism and the material taking station; The feeding mechanism includes a feeding bracket and a feeding track. The feeding track is arranged on the feeding bracket. The feeding track is arranged obliquely for conveying the storage box. A recycling station is formed on the top of the feeding bracket. The receiving and lifting mechanism is arranged on one side of the feeding mechanism, and is used to receive and lift the storage box transmitted by the feeding mechanism; The transfer mechanism is installed on the basic frame, the material grabbing gripper mechanism is slidably connected to the top of the basic frame, and the material grabbing gripper mechanism is also connected to the synchronous belt of the transfer mechanism, so that the transfer mechanism transmits the material grabbing gripper mechanism; the material grabbing gripper mechanism is used to suck the pallet.

2. The automatic feeding equipment according to claim 1, characterized in that: The feeding bracket is composed of profiles, and a blocking component is provided on the feeding bracket, and the blocking component is used to block the storage box passing through the feeding track; the blocking component includes a blocking cylinder and a blocking plate, and the blocking plate is installed to the output end of the blocking cylinder.

3. The automatic feeding equipment according to claim 1, characterized in that: The material receiving and lifting mechanism comprises a material receiving component and a lifting component; The lifting assembly includes a lifting slide rail, a lifting motor and a lifting screw; the lifting slide rail is installed on the basic frame, the lifting motor and the lifting screw are also installed on the basic frame, and the lifting screw is connected to the output end of the lifting motor; the material receiving assembly is connected to the lifting slide rail through a slider, and the material receiving assembly is also threadedly connected to the lifting screw through a nut seat to achieve the lifting and lowering of the material receiving assembly.

4. The automatic feeding equipment according to claim 3, characterized in that: The material receiving assembly includes a receiving bottom plate, a receiving top plate, a receiving cylinder and a receiving limit assembly; the receiving top plate is hinged to one end of the receiving bottom plate, and a receiving cylinder is provided between the receiving top plate at the other end and the receiving bottom plate, and the receiving cylinder can lift the receiving top plate; the raised receiving top plate can be connected to the feeding track.

5. The automatic feeding equipment according to claim 4, characterized in that: The upper surface of the receiving top plate is provided with a surrounding plate, and one side of the receiving top plate is also provided with a receiving limit assembly; the receiving limit assembly includes an X-direction limit cylinder, a Y-direction limit cylinder and a receiving limit plate; The X-direction limit cylinder is installed to the lower surface of the end of the receiving top plate away from the hinge point, the Y-direction limit cylinder is installed to the output end of the X-direction limit cylinder, and the receiving limit plate is installed to the output end of the Y-direction limit cylinder to achieve the limitation of the storage box entering the receiving top plate.

6. The automatic feeding equipment according to claim 1, characterized in that: The transfer assembly includes a transfer motor and a synchronous belt; the transfer motor is installed on a basic frame, and a driving wheel and a driven wheel are respectively provided at both ends of the basic frame, and the driving wheel and the driven wheel are connected by a synchronous belt; the output end of the transfer motor is connected to the driving wheel; transfer slide rails are provided on both sides of the top of the basic frame.

7. The automatic feeding equipment according to claim 6, characterized in that: The material grabbing gripper mechanism comprises a vertical moving assembly and a gripper assembly; a bottom plate is provided at the bottom of the vertical moving assembly, and the bottom plate is connected to the transfer slide rail via a transfer slider; The bottom of the base plate is also fixedly connected to the synchronous belt through a fixing piece to achieve lateral driving of the vertical moving component; The gripper assembly is installed on the moving end of the vertical moving assembly through a connecting frame to achieve the up and down movement of the gripper assembly.

8. The automatic feeding equipment according to claim 7, characterized in that: The gripper assembly comprises a gripper integrated frame, a gripper body and an adjustment plate; The gripper integrated frame is composed of profiles, and a plurality of gripper bodies are connected to the gripper integrated frame through an adjustment plate; an oblong groove is provided on the adjustment plate to adjust the position of the gripper body.

9. The automatic feeding equipment according to claim 8, characterized in that: The gripper body is connected to the adjustment plate via an extension rod; the gripper body and the extension rod are connected via an angle adjustment member to achieve adjustment of the gripper body angle.

10. The automatic feeding equipment according to claim 8, characterized in that: The gripper body comprises an outer tube, an inner tube and a suction cup; the inner tube is sleeved on the outer tube, a spring is arranged between the inner tube and the outer tube, a suction cup is arranged at one end of the inner tube, and the other end is connected to an air source.

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