Speed-controlled docking device

Abstract

The utility model provides a speed-controllable docking device, which is used to be arranged between a printer and a file filling device, and includes a fixed frame, a support plate, a paper feed detection sensor, a plurality of file detection sensors, a conveying module and a paper output module. The two ends of the support plate are respectively an input end and an output end, and the input end is provided with a paper feed detection sensor, and the support plate is provided with a plurality of buffer positions arranged in the transverse direction. The plurality of file detection sensors are respectively arranged at the plurality of buffer positions in a one-to-one correspondence. The conveying module includes a synchronous belt, which is used to sequentially transfer the ends of the plurality of files to each buffer position in the transverse direction. The paper output module is used to convey the files to the file filling device. The utility model provides a speed-controllable docking device, which can make a plurality of files be arranged in order when the speed of the printer is relatively fast, and output the files at a speed matching the file filling device, and by caching a certain number of files, the situation where the speed of the printer is relatively slow can be neutralized.

Description

Technical Field

[0001] The utility model relates to the technical field of automation equipment, in particular to a speed-controllable docking device. Background Art

[0002] With the advent of the industrial age, printers have long been closely related to us. Even in the digital information age, paper documents are still the authoritative choice for some industries, such as admission letters, lawyer letters, etc. Usually, the documents output by the printer are automatically loaded into envelopes one by one through the document filling device. The inkjet printers we currently use have uneven paper output speeds and cannot match the speed of the document filling device. When the paper output speed of the printer is faster than that of the document filling device, the documents will be stacked in the paper output area of ​​the printer, resulting in the inability to transport the documents normally.

[0003] Therefore, it is necessary to provide a speed-controllable docking device to solve the above technical problems. Utility Model Content

[0004] The utility model provides a speed-controllable docking device, which can arrange multiple files in order when the speed of the printer is fast, output the files at a speed matching the file filling device, and neutralize the situation of slow printer speed by caching a certain number of files.

[0005] The technical solution of the utility model is:

[0006] A speed-controllable docking device, used to be arranged between a printer and a document filling device, comprising:

[0007] Fixed frame;

[0008] A support plate, which is arranged on the fixing frame, and has two ends, respectively, an input end and an output end, wherein the input end is used to connect with the output end of the printer, the input end is provided with a paper feeding detection sensor, and the support plate is provided with a plurality of buffer positions arranged in a transverse direction;

[0009] A plurality of document detection sensors are respectively disposed at the plurality of buffer positions in a one-to-one correspondence;

[0010] A conveying module is arranged on the fixing frame, the conveying module comprises a synchronous belt, the synchronous belt is sleeved on the supporting plate, and is used to sequentially transfer the ends of a plurality of files to each of the buffer positions in a transverse direction; and

[0011] The paper output module is arranged on the fixing frame and adjacent to the output end, and is used for delivering the document to the document filling device.

[0012] In the speed-controllable docking device of the utility model, four buffer positions are provided, and four file detection sensors are provided correspondingly.

[0013] In the speed-controllable docking device of the utility model, a plurality of perforations are arranged on the support plate, and the document detection sensor is located below the support plate and at the perforations.

[0014] In the speed-controllable docking device of the utility model, a plurality of the document detection sensors are arranged at equal intervals, and the conveying module further comprises a stepping motor which is transmission-connected to the synchronous belt.

[0015] In the speed-controllable docking device described in the utility model, the support plate includes a first section, a second section and a third section, the input end is located in the first section, the output end is located in the third section, the first section is lower than the third section, the second section is obliquely arranged between the first section and the second section, the buffer position is arranged on both the third section and the second section, and the angle between the third section and the second section on the upper side of the support plate is 180°-270°.

[0016] In the speed-controllable docking device described in the utility model, the conveying module also includes a conveying driving wheel, a first conveying driven wheel and a second conveying driven wheel, and the synchronous belt is sleeved on the three. The conveying driving wheel is located at the first section, the first conveying driven wheel is located at the connection between the second section and the third section, and the second conveying driven wheel is located at the output end.

[0017] In the speed-controllable docking device described in the utility model, the conveying module also includes a first guide plate, which is arranged above the synchronous belt, the first guide plate includes a first inclined section and a first parallel section, the first inclined section is inclined relative to the synchronous belt, one end of the first inclined section is connected to the fixed frame, and the other end extends toward the direction of the paper output module and is connected to one end of the first parallel section, the other end of the first parallel section extends toward the direction of the paper output module, and the first parallel section is pressed parallel to the synchronous belt at the conveying driving wheel.

[0018] In the speed-controllable docking device described in the utility model, the conveying module also includes a second guide plate, which is arranged above the synchronous belt, the second guide plate includes a second inclined section and a second parallel section, the second inclined section is inclined relative to the synchronous belt, one end of the second inclined section is connected to the fixed frame, and the other end extends toward the direction of the paper output module and is connected to one end of the second parallel section, the other end of the second parallel section extends toward the direction of the paper output module, the second parallel section is pressed parallel to the synchronous belt between the conveying driving wheel and the first conveying driven wheel, and the second parallel section is close to the first conveying driven wheel relative to the first parallel section.

[0019] In the speed-controllable docking device described in the utility model, the paper discharge module includes a paper discharge driving wheel and a paper discharge driven wheel arranged vertically, and the two are in squeeze contact; the conveying module also includes a third guide plate, which is obliquely arranged above the second conveying driven wheel, and is used to press the paper toward the gap between the paper discharge driving wheel and the paper discharge driven wheel.

[0020] In the speed-controllable docking device described in the utility model, the fixed frame includes a fixed plate, a base, a position adjustment connecting rod, a support rod and a connecting structure. The base is provided with a strip hole, and the strip hole extends in the transverse direction. The base is connected to the fixed plate through the strip hole. The two ends of the position adjustment connecting rod are rotatably connected to the base and the connecting structure respectively. One end of the support rod is fixedly connected to the fixed plate, and the other end is rotatably connected to the connecting structure. The support plate is connected to the connecting structure.

[0021] Compared with the prior art, the utility model has the following beneficial effects: the speed-controllable docking device of the utility model, the paper input detection sensor detects the output file of the printer, and the file output by the printer is delivered to the paper output module through the delivery module, and then the file is delivered to the file filling device through the paper output module; when the printer speed is fast, the ends of multiple files are respectively delivered to multiple buffer positions through multiple file detection sensors, so that multiple files are arranged in an orderly staggered manner to avoid multiple files being stacked together and difficult to separate; a certain number of files are cached, and the delivery module outputs the files one by one at a speed matching the file filling device; and, when the printer speed is slow, the files at each buffer position can be delivered one by one to the paper output module to ensure the operating efficiency of the file filling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the utility model.

[0023] Figure 1The present invention is a schematic diagram of the overall structure of a speed-controllable docking device provided in a preferred embodiment of the present invention.

[0024] Figure 2 Another overall structural schematic diagram of a speed-controllable docking device provided in a preferred embodiment of the utility model.

[0025] Figure 3 A schematic structural diagram of a support plate of a speed-controllable docking device provided in a preferred embodiment of the utility model.

[0026] in,

[0027] 11. Fixed frame,

[0028] 111. fixing plate, 112. base, 1121. strip hole, 113. position adjustment connecting rod, 114. support rod, 115. connection structure,

[0029] 12. Support plate, 121. Input end, 122. Output end, 123. Perforation, 124. First section, 125. Second section, 126. Third section,

[0030] 13. Paper feeding detection sensor,

[0031] 14. Document detection sensor,

[0032] 15. Conveying module,

[0033] 151. synchronous belt, 152. driving conveyor wheel, 153. first conveyor driven wheel, 154. second conveyor driven wheel, 155. first guide plate, 1551. first inclined section, 1552. first parallel section, 156. second guide plate, 1561. second inclined section, 1562. second parallel section, 157. third guide plate,

[0034] 16. Paper discharge module, 161. Paper discharge driving wheel, 162. Paper discharge driven wheel.

[0035] In the figures, structurally similar elements are denoted by the same reference numerals. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0037] Directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used for reference to the directions of the drawings. The directional terms used are used to illustrate and understand the present invention, and are not used to limit the present invention.

[0038] The words "first", "second" and the like in the terminology of the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, and should not be construed as limiting the order of precedence.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The inkjet printers we currently use directly stack documents in the paper output area after printing, and the printer will have an uneven paper output speed. As a result, when connecting to professional document filling equipment, the speed cannot match the document filling equipment, affecting the operating efficiency of the document filling equipment.

[0041] The following is a preferred embodiment of a speed-controllable docking device provided by the utility model that can solve the above technical problems.

[0042] Please refer to Figure 1 , Figure 2 and Figure 3 The preferred embodiment of the utility model provides a speed-controllable docking device, which is used to be arranged between a printer and a document filling device, and includes a fixed frame 11, a support plate 12, a paper feed detection sensor 13, a plurality of document detection sensors 14, a conveying module 15 and a paper discharge module 16. The support plate 12 is arranged on the fixed frame 11, and its two ends are an input end 121 and an output end 122, respectively. The input end 121 is used to connect with the output end 122 of the printer, and the input end 121 is provided with a paper feed detection sensor 13, and the support plate 12 is provided with a plurality of buffer positions arranged in the transverse direction. The plurality of document detection sensors 14 are respectively arranged at the plurality of buffer positions in a one-to-one correspondence. The conveying module 15 is arranged on the fixed frame 11, and the conveying module 15 includes a synchronous belt 151, which is sleeved on the support plate 12, and is used to sequentially transfer the ends of the plurality of documents to each buffer position in the transverse direction. The paper discharge module 16 is arranged on the fixed frame 11, and is arranged adjacent to the output end 122, and is used to convey the documents to the document filling device.

[0043] In the speed-controllable docking device of the utility model, the paper input detection sensor 13 detects the output file of the printer, and the file output by the printer is delivered to the paper output module 16 through the delivery module 15, and then the file is delivered to the file filling device through the paper output module 16; when the speed of the printer is relatively fast, the ends of the multiple files are respectively delivered to the multiple buffer positions through the multiple file detection sensors 14, so that the multiple files are arranged in an orderly staggered manner to avoid the multiple files being stacked together and difficult to separate; a certain number of files are cached, and the delivery module 15 outputs the files one by one at a speed matching the file filling device; and, when the speed of the printer is relatively slow, the files at each buffer position can be delivered one by one to the paper output module 16 to ensure the operating efficiency of the file filling device.

[0044] Please refer to Figure 1 , there are four buffer positions, and the file detection sensors 14 are set to the corresponding four. Usually, there are four files in a print task, and four buffer positions can be used to buffer all four files in a print task. With the above structure, the number of buffer positions can be matched with the number of files to avoid waste.

[0045] Please refer to Figure 1 and Figure 3 The support plate 12 is provided with a plurality of perforations 123, and the document detection sensor 14 is located below the support plate 12 and at the perforations 123. With this structure, each document detection sensor 14 can accurately correspond to each buffer position, and the document detection sensor 14 will not affect the normal conveyance of the document.

[0046] Please refer to Figure 1 , multiple document detection sensors 14 are arranged at equal intervals, and the conveying module 15 also includes a stepping motor, which is connected to the synchronous belt 151. In the above structure, the driving device of the conveying module 15 adopts a stepping motor, which can realize the movement of the synchronous belt 151 according to the specified parameters, so that the documents are arranged in order, and it is convenient to control the documents to be transmitted one by one to the paper output module 16. Multiple document detection sensors 14 are arranged at equal intervals, so that multiple documents can be evenly arranged at equal intervals.

[0047] Please refer to Figure 3The support plate 12 includes a first section 124, a second section 125 and a third section 126. The input end 121 is located in the first section 124, and the output end 122 is located in the third section 126. The first section 124 is lower than the third section 126. The second section 125 is tilted between the first section 124 and the second section 125. The third section 126 and the second section 125 are both provided with buffer positions. The angle between the third section 126 and the second section 125 on the upper side of the support plate 12 is 180°-270°. The inlet of the document filling device is higher than the outlet of the printer. With the above structure, the paper output module 16 can be set at the same height as the inlet of the document filling device. The horizontal first section 124 receives the documents output by the printer, and the documents are gradually raised by the second section 125. Then, the documents are delivered to the paper output module 16 by the horizontal third section 126, which can solve the problem that the inlet of the document filling device and the outlet of the printer are not at the same height.

[0048] Please refer to Figure 1 The conveying module 15 further includes a conveying driving wheel 152, a first conveying driven wheel 153 and a second conveying driven wheel 154, and the synchronous belt 151 is sleeved on the three. The conveying driving wheel 152 is located at the first section 124, the first conveying driven wheel 153 is located at the connection between the second section 125 and the third section 126, and the second conveying driven wheel 154 is located at the output end 122. With the above structure, the synchronous belt 151 located between the conveying driving wheel 152 and the first conveying driven wheel 153 is parallel to the second section 125 to ensure that the document is always in contact with the synchronous belt 151.

[0049] Please refer to Figure 1 The conveying module 15 also includes a first guide plate 155, which is arranged above the synchronous belt 151. The first guide plate 155 includes a first inclined section 1551 and a first parallel section 1552. The first inclined section 1551 is inclined relative to the synchronous belt 151. One end of the first inclined section 1551 is connected to the fixing frame 11, and the other end extends toward the direction of the paper discharge module 16 and is connected to one end of the first parallel section 1552. The other end of the first parallel section 1552 extends toward the direction of the paper discharge module 16. The first parallel section 1552 is pressed parallel to the synchronous belt 151 at the conveying driving wheel 152. In the above structure, the first parallel section 1552 can guide the document with a certain initial speed coming out of the printer. The document position is mechanically aligned through the first parallel section 1552. The first parallel section 1552 presses the document toward the synchronous belt 151, so that appropriate friction is generated between the document and the synchronous belt 151, thereby facilitating the synchronous belt 151 to transport the document. At the same time, the angle between the first inclined section 1551 and the synchronous belt 151 is an acute angle in the paper feeding direction. During the transportation of the document, the first inclined section 1551 has a certain elasticity, which can prevent the first parallel section 1552 from applying too much pressure to the document, causing the document to be transported unsmoothly.

[0050] Please continue to refer to Figure 1 The conveying module 15 also includes a second guide plate 156, which is arranged above the synchronous belt 151. The second guide plate 156 includes a second inclined section 1561 and a second parallel section 1562. The second inclined section 1561 is inclined relative to the synchronous belt 151. One end of the second inclined section 1561 is connected to the fixing frame 11, and the other end extends toward the direction of the paper output module 16 and is connected to one end of the second parallel section 1562. The other end of the second parallel section 1562 extends toward the direction of the paper output module 16. The second parallel section 1562 is pressed in parallel on the synchronous belt 151 between the conveying driving wheel 152 and the first conveying driven wheel 153. The second parallel section 1562 is close to the first conveying driven wheel 153 relative to the first parallel section 1552. In the above structure, when the document is conveyed on a slope, the second parallel section 1562 can position the document so that appropriate friction is generated between the document and the synchronous belt 151, thereby facilitating the synchronous belt 151 to convey the document. At the same time, the angle between the second inclined section 1561 and the synchronous belt 151 is an acute angle in the paper feeding direction. During the conveyance of the document, the second inclined section 1561 has a certain elasticity, which can prevent the second parallel section 1562 from applying excessive pressure to the document, causing the document to be conveyed unsmoothly.

[0051] Please continue to refer to Figure 1 , the paper discharge module 16 includes a paper discharge driving wheel 161 and a paper discharge driven wheel 162 arranged vertically, and the two are in squeeze contact. The conveying module 15 also includes a third guide plate 157, which is tilted above the second conveying driven wheel 154 and is used to press the paper to the gap between the paper discharge driving wheel 161 and the paper discharge driven wheel 162. In the above structure, the paper discharge driving wheel 161 and the paper discharge driven wheel 162 send the document out through friction, and the conveying process is stable. After the document is conveyed through the slope, its end is easy to face upward. At the same time, when the document leaves the conveyor belt, it will be subjected to the external force given by the second conveying driven wheel 154, and the document is easy to be skewed or misaligned, resulting in the document being unable to align with the gap between the paper discharge driving wheel 161 and the paper discharge driven wheel 162. The position of the document can be adjusted by the third guide plate 157, and the end of the document can be sent into the gap between the paper discharge driving wheel 161 and the paper discharge driven wheel 162.

[0052] Please refer to Figure 2The fixed frame 11 includes a fixed plate 111, a base 112, a position adjustment connecting rod 113, a support rod 114 and a connecting structure 115. The base 112 is provided with a strip hole 1121, which extends in the horizontal direction. The base 112 is adjustably connected to the fixed plate 111 through the strip hole 1121. The two ends of the position adjustment connecting rod 113 are rotatably connected to the base 112 and the connecting structure 115 respectively. The support rod 114 is arranged in the vertical direction, one end of which is fixedly connected to the fixed plate 111, and the other end is rotatably connected to the connecting structure 115, and the support plate 12 is connected to the connecting structure 115. In the above structure, the relative position of the base 112 and the fixed plate 111 in the horizontal direction can be adjusted through the strip hole 1121, so that the connecting structure 115 is driven to rotate relative to the support rod 114 through the position adjustment connecting rod 113, and then the height of the input end 121 of the support plate 12 is adjusted to align with the outlet of the printer.

[0053] The working process of the speed-controllable docking device of the preferred embodiment of the utility model is as follows:

[0054] Assume that the four buffer positions on the support plate 12 are position 1, position 2, position 3 and position 4 from the output end 122 to the input end 121, respectively. If the speed of the printer is fast, multiple files continuously flow to the input end 121 of the support plate 12, and the paper input detection sensor 13 will detect the files printed by the printer. The synchronous belt 151 will first send the first file to position 4. After the second file arrives, the synchronous belt 151 will send the first file to position 3 and send the second file to position 4 at the same time, and so on, until the first file is sent to position 1, the second file is sent to position 2, the third file is sent to position 3, and the fourth file is sent to position 4. When the file filling device needs a file, the conveying driving wheel 152 and the paper discharge driving wheel 161 rotate at the same time, and the first file is sent to the conveyor belt of the file filling device by the paper discharge driving wheel 161. When the first file is separated from the paper discharge driving wheel 161, the paper discharge driving wheel 161 stops rotating. At this time, the synchronous belt 151 will send the second file to position 1, and the latter will be arranged in sequence. The speed of the printer is uncontrollable, sometimes fast and sometimes slow. By caching a certain number of files on the support plate 12, files with fast printing speed can be cached to balance the slow printing speed. Therefore, no matter how fast or slow the printer is, when the file filling device needs files, the paper output module 16 can deliver the files to the file filling device one by one to ensure the operating efficiency of the file filling device.

[0055] This completes the working process of the speed-controllable docking device of the preferred embodiment.

[0056] The speed-controllable docking device of the utility model has a paper input detection sensor that detects the output file of the printer, and transmits the file output by the printer to the output module through the conveying module, and then transmits the file to the file filling device through the output module; when the speed of the printer is relatively fast, the ends of the multiple files are respectively conveyed to the multiple buffer positions through the multiple file detection sensors, so that the multiple files are arranged in an orderly staggered manner, and it is avoided that the multiple files are stacked together and difficult to separate; a certain number of files are buffered, and the conveying module outputs the files one by one at a speed matching the file filling device; and, when the speed of the printer is relatively slow, the files at each buffer position can be conveyed one by one to the output module, so as to ensure the operation efficiency of the file filling device.

[0057] To sum up, although the present invention has been disclosed as above in the form of preferred embodiments, the protection scope of the present invention is not limited thereto, and any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the concept of the technical solution of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A speed-controllable docking device, characterized in that: Used to be set between a printer and a document filling device, it includes: Fixed frame; A support plate, which is arranged on the fixing frame, and has two ends, respectively, an input end and an output end, wherein the input end is used to connect with the output end of the printer, the input end is provided with a paper feeding detection sensor, and the support plate is provided with a plurality of buffer positions arranged in a transverse direction; A plurality of document detection sensors are respectively disposed at the plurality of buffer positions in a one-to-one correspondence; A conveying module is arranged on the fixing frame, the conveying module comprises a synchronous belt, the synchronous belt is sleeved on the supporting plate, and is used to sequentially transfer the ends of a plurality of files to each of the buffer positions in a transverse direction; and The paper output module is arranged on the fixing frame and adjacent to the output end, and is used for delivering the document to the document filling device.

2. The speed-controllable docking device according to claim 1, characterized in that: The number of buffer positions is four, and the number of file detection sensors is correspondingly four.

3. The speed-controllable docking device according to claim 1, characterized in that: The support plate is provided with a plurality of through holes, and the document detection sensor is located below the support plate and at the through holes.

4. The speed-controllable docking device according to claim 1, characterized in that: The plurality of document detection sensors are arranged at equal intervals, and the conveying module further comprises a stepping motor which is transmission-connected to the synchronous belt.

5. The speed-controllable docking device according to claim 1, characterized in that: The support plate includes a first section, a second section and a third section, the input end is located in the first section, the output end is located in the third section, the first section is lower than the third section, the second section is obliquely arranged between the first section and the second section, the buffer position is arranged on both the third section and the second section, and the angle between the third section and the second section on the upper side of the support plate is 180°-270°.

6. The speed-controllable docking device according to claim 5, characterized in that: The conveying module also includes a conveying driving wheel, a first conveying driven wheel and a second conveying driven wheel, and the synchronous belt is sleeved on the three. The conveying driving wheel is located at the first section, the first conveying driven wheel is located at the connection between the second section and the third section, and the second conveying driven wheel is located at the output end.

7. The speed-controllable docking device according to claim 6, characterized in that: The conveying module also includes a first guide plate, which is arranged above the synchronous belt, the first guide plate includes a first inclined section and a first parallel section, the first inclined section is inclined relative to the synchronous belt, one end of the first inclined section is connected to the fixed frame, and the other end extends toward the direction of the paper output module and is connected to one end of the first parallel section, the other end of the first parallel section extends toward the direction of the paper output module, and the first parallel section is pressed parallel to the synchronous belt at the conveying driving wheel.

8. The speed-controllable docking device according to claim 7, characterized in that: The conveying module also includes a second guide plate, which is arranged above the synchronous belt, the second guide plate includes a second inclined section and a second parallel section, the second inclined section is inclined relative to the synchronous belt, one end of the second inclined section is connected to the fixing frame, and the other end extends toward the direction of the paper output module and is connected to one end of the second parallel section, the other end of the second parallel section extends toward the direction of the paper output module, the second parallel section is parallel to the synchronous belt between the conveying driving wheel and the first conveying driven wheel, and the second parallel section is close to the first conveying driven wheel relative to the first parallel section.

9. The speed-controllable docking device according to claim 6, characterized in that: The paper discharge module includes a paper discharge driving wheel and a paper discharge driven wheel arranged vertically, which are in squeeze contact with each other; the conveying module also includes a third guide plate, which is obliquely arranged above the second conveying driven wheel and is used to press the paper toward the gap between the paper discharge driving wheel and the paper discharge driven wheel.

10. The speed-controllable docking device according to any one of claims 1 to 9, characterized in that: The fixing frame includes a fixing plate, a base, a position adjustment connecting rod, a support rod and a connecting structure. The base is provided with a strip hole, the strip hole extends in the transverse direction, the base is connected to the fixing plate through the strip hole, and the two ends of the position adjustment connecting rod are rotatably connected to the base and the connecting structure respectively. One end of the support rod is fixedly connected to the fixing plate, and the other end is rotatably connected to the connecting structure. The supporting plate is connected to the connecting structure.

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