A solder mask printing device for PCB boards

Abstract

The present invention discloses a solder mask printing device for a PCB board, which includes a printing device body. The interior of the printing device body is of a cavity structure, and auxiliary device one and auxiliary device two are provided on the outer side wall of the printing device body. Moreover, auxiliary device one and auxiliary device two are detachably fixed to the printing device body. The printing device body includes a vertical side wall one, a vertical side wall two, a top plate one and a bottom plate one. An opening one is provided on the vertical side wall one, and an opening two is provided on the vertical side wall two. A detachable curtain one and a detachable curtain two are respectively provided on the opening one and the opening two. A support pad is provided on the bottom of the printing device body. The beneficial effects of the present invention are: compact structure, reducing the working intensity of workers, improving the printing of PCB boards at different angles, and improving the simple drilling of PCB boards.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB board processing, and particularly to a solder mask printing device for PCB boards. Background Art

[0002] A printed circuit board, also known as a printed wiring board, is a provider of electrical connections for electronic components. Its development has a history of more than 100 years. Its design is mainly layout design. The main advantages of using a circuit board are greatly reducing wiring and assembly errors, improving the automation level and production labor rate. According to the number of circuit board layers, it can be divided into single-sided boards, double-sided boards, four-layer boards, six-layer boards, and other multi-layer circuit boards.

[0003] Although the existing printed circuit board devices can perform printing, there are still many defects: 1. Chinese Patent No. CN211329957U discloses a solder mask printing device for PCB boards, and specifically discloses: including a housing, a printing device, and a fixing device; the printing device includes an ink tank fixedly connected to the top of the housing, a support plate fixedly connected inside the housing, a chute opened inside the support plate, and a rodless cylinder fixedly connected to the top of the support plate; the fixing device includes a fixing plate fixedly connected inside the housing, a movable groove opened at the top of the fixing plate, a movable block slidably connected inside the movable groove, a side plate fixedly connected to the top of the movable block, a connecting cylinder installed at one end of the side plate, and a placement plate fixedly connected to the top of the fixing plate. A screw rod is rotatably connected inside the movable groove, and the screw rod is threadedly connected to the movable block. One end of the screw rod is sleeved with a small gear, the small gear is meshed with a large gear, the large gear is sleeved at one end of a crank, and the crank is rotatably connected to the top of one end of the fixing plate through a bearing. The output end of the connecting cylinder is fixedly connected to one end of a fixing frame, and a groove is opened inside one end of the fixing frame. One end of the groove communicates with an adjustment hole, an adjustment bolt is threadedly connected inside the adjustment hole, one end of the adjustment bolt is fixedly connected to a pressing plate, and the pressing plate is slidably connected to the groove. An anti-slip rubber pad is fixedly connected to the bottom end of the groove. The output end of the rodless cylinder is fixedly connected to one end of a connecting rod, and the other end of the connecting rod is fixedly connected to a slider. The bottom end of the slider is fixedly connected to a connecting seat. One end of the ink tank communicates with one end of a connecting hose, and the other end of the connecting hose communicates with the inside of the connecting seat. An electrostatic spray gun is installed at one end of the connecting seat, and the electrostatic spray gun communicates with the connecting hose; although this patent discloses a horizontal clamping device, in the actual printing process, it is necessary to initially print the back of the board. The existing single clamping device makes the effect of secondary printing on the back unsatisfactory.

[0004] Based on the above technical defects, the present application urgently needs a solder mask printing device for PCB boards. Summary of the Invention

[0005] The object of the present invention is to overcome the shortcomings of the prior art, and provide a solder mask printing device for a PCB board, which has a compact structure, reduces the working intensity of workers, improves the printing of the PCB board at different angles, and improves the simple drilling of the PCB board.

[0006] The object of the present invention is achieved by the following technical solutions: A solder mask printing device for a PCB board, including a printing device body, the inside of the printing device body is a cavity structure, and an auxiliary device one and an auxiliary device two are provided on the outer side wall of the printing device body, and the auxiliary device one and the auxiliary device two are detachably fixed on the printing device body;

[0007] The printing device body includes a vertical side wall one, a vertical side wall two, a top plate one and a bottom plate one. An opening one is provided on the vertical side wall one, an opening two is provided on the vertical side wall two, a detachable curtain one and a detachable curtain two are respectively provided on the opening one and the opening two. A support pad is provided at the bottom of the printing device body. A first cavity and a second cavity are provided inside the printing device body, and a detachable partition one is provided between the first cavity and the second cavity. A printing component is provided inside the second cavity. A detachable support plate one is provided on the auxiliary device one. The inside of the auxiliary device two is a cavity structure, and the top is provided with a flowing port.

[0008] In the solder mask printing device for a PCB board of the present invention, the volume of the second cavity is larger than the volume of the first cavity. A detachable placing plate one and a detachable placing plate two are provided at the bottom of the detachable support plate one. A detachable drilling device is provided above the detachable support plate one. The auxiliary device one includes a vertical side wall three, and an opening three is provided on the vertical side wall three. The detachable support plate one is placed on the detachable placing plate one and the detachable placing plate two respectively through the opening three.

[0009] In the solder mask printing device for a PCB board of the present invention, a through hole one is provided on the auxiliary device one. The length of the detachable support plate one is greater than the width of the auxiliary device one. Blind hole threads one and blind hole threads two are respectively provided at the bottoms of the opening one and the opening two. A detachable telescopic support component one and a detachable telescopic support component two are respectively provided on the blind hole threads one and the blind hole threads two.

[0010] In the solder mask printing device for a PCB board of the present invention, the detachable support component one and the detachable support component two respectively include a fixed section one and a telescopic section two provided above the fixed section one. A support rotating roller one is provided at the top of the telescopic section two. The printing component includes a vertical auxiliary plate one and a vertical auxiliary plate two. A detachable cover plate one is provided between the vertical auxiliary plate one and the vertical auxiliary plate two. A through hole two is provided in the middle of the detachable cover plate one, and a lifting plate one is provided on the through hole two.

[0011] In the solder mask printing device for PCB boards of the present invention, a first section and a second section are provided on the top of the first lifting plate, and the first section and the second section are integrally formed. Through holes three are provided in the middle of the first section and the second section respectively, and a detachable auxiliary printing plate one and a detachable auxiliary printing plate two are respectively provided on the through holes three. Both ends of the detachable auxiliary printing plate one and the detachable auxiliary printing plate two are fixed by bolts. A rectangular groove one is provided on the detachable auxiliary printing plate one, and at least three rectangular grooves one are provided. A vertical rectangular groove two is provided on the top of the detachable auxiliary printing plate two, and the rectangular groove one and the rectangular groove two are arranged in a cross manner.

[0012] In the solder mask printing device for PCB boards of the present invention, the length of the rectangular groove two is less than the length of the rectangular groove one. Detachable rotating universal wheels are provided on the tops of the detachable auxiliary printing plate one and the detachable auxiliary printing plate two. Rotating plates one and two are respectively provided at both ends of the detachable cover plate one, and the rotating plate one cooperates with the detachable telescopic support member one, and the rotating plate two cooperates with the detachable telescopic support member two. The rotating plate one and the rotating plate two are hinge-rotatably connected to both ends of the detachable cover plate one.

[0013] In the solder mask printing device for PCB boards of the present invention, the rotating plate one and the rotating plate two have the same structure, and both are provided with a third section and a fourth section. The third section and the fourth section are integrally formed. At least five columns of through holes four and five detachable raised strips are provided on the third section. The through holes four and the detachable raised strips are arranged in an alternating manner. A guiding inclined surface one is provided between the fourth section and the third section, and guiding grooves one, two, three and four are provided at the bottom of the guiding inclined surface one.

[0014] In the solder mask printing device for PCB boards of the present invention, a detachable airtight baffle one is provided on the guiding grooves one, two, three and four. Detachable fixing flanges are provided at both ends of the detachable airtight baffle one, and the fixing flanges are fixed by bolts. Semi-circular protrusions one, two, three and four are provided at the bottom of the detachable airtight baffle one, and the semi-circular protrusions one, two, three and four cooperate with any position of the guiding grooves one, two, three and four.

[0015] In the solder mask printing device for a PCB board of the present invention, the PCB board can be placed on the first rotating plate, the second rotating plate or the first lifting plate. Above the printing component, there is a movable spraying plate, and a number of spraying branch pipes are provided on the bottom of the movable spraying plate. Above the movable spraying plate, there is a first movable pipe, and the first movable pipe can move freely on the first detachable partition plate. On the first top plate, there is a storage tank, and a first connecting hose is provided between the storage tank and the first movable pipe.

[0016] In the solder mask printing device for a PCB board of the present invention, on one side of the first detachable airtight baffle, there is a tapered deflector, and the tapered deflector is detachable. The ends of the first rotating plate and the second rotating plate are located above the first auxiliary device and the second auxiliary device.

[0017] The present invention has the following advantages:

[0018] 1. The interior of the printing device body of the present invention is a cavity structure, and the first auxiliary device and the second auxiliary device are provided on the outer side wall of the printing device body, enabling auxiliary processing and efficient collection and disposal of the printing liquid. The first auxiliary device and the second auxiliary device are detachably fixed to the printing device body.

[0019] The printing device body includes a first vertical side wall, a second vertical side wall, a first top plate and a first bottom plate. There is a first opening on the first vertical side wall and a second opening on the second vertical side wall. A first detachable curtain and a second detachable curtain are respectively provided on the first opening and the second opening, enabling installation and disassembly according to needs. A support pad is provided on the bottom of the printing device body. A first cavity and a second cavity are provided inside the printing device body, and a first detachable partition is provided between the first cavity and the second cavity. A printing component is provided inside the second cavity. A first detachable support plate is provided on the first auxiliary device. The interior of the second auxiliary device is a cavity structure, and the top is provided with a draining opening, ensuring the collection of the printing liquid.

[0020] 2. The volume of the second cavity of the present invention is larger than that of the first cavity, enabling convenient printing in the second cavity. A first detachable placing plate and a second detachable placing plate are provided on the bottom of the first detachable support plate, enabling processing and disposal according to actual needs. A detachable drilling device is provided above the first detachable support plate. The first auxiliary device includes a third vertical side wall, and there is a third opening on the third vertical side wall. The first detachable support plate is placed on the first detachable placing plate and the second detachable placing plate respectively through the third opening.

[0021] An auxiliary device I is provided with a through hole I. The length of the detachable support plate I is greater than the width of the auxiliary device I, so as to ensure the installation and disassembly of the PCB board. Blind hole threads I and II are respectively provided at the bottoms of the opening I and the opening II, and a detachable telescopic support member I and a detachable telescopic support member II are respectively provided on the blind hole threads I and II.

[0022] The detachable support member I and the detachable support member II respectively include a fixed section I and a telescopic section II provided above the fixed section I. A support rotating roller I is provided at the top of the telescopic section II, so as to enable sliding jacking, meeting the printing disposal at different angles. The printing member includes a vertical auxiliary plate I and a vertical auxiliary plate II, and a detachable cover plate I is provided between the vertical auxiliary plate I and the vertical auxiliary plate II. A through hole II is provided in the middle of the detachable cover plate I, and a lifting plate I is provided on the through hole II. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the present invention;

[0024] Figure 2 is a schematic structural diagram of the lifting plate I in the present invention;

[0025] Figure 3 is a schematic structural diagram of the rotating plate I in the present invention;

[0026] Figure 4 is Figure 1 a partial enlarged schematic view of part A in;

[0027] Figure 5 is Figure 1 a partial enlarged schematic view of part B in;

[0028] Figure 6 is Figure 1 a partial enlarged schematic view of part C in;

[0029] Figure 7 is Figure 3 a sectional schematic view taken along line D-D in;

[0030] Figure 8 is Figure 7 a partial enlarged schematic view of part E in;

[0031] Figure 9 is Figure 1 a partial enlarged schematic view of part F in.

[0032] In the figure, there are a printing device body 1, a first auxiliary device 2, a second auxiliary device 3, a first vertical side wall 4, a second vertical side wall 5, a first top plate 6, a first bottom plate 7, a first opening 8, a second opening 9, a first cavity 10, a second cavity 11, a detachable support plate 1, a detachable placement plate 14, a detachable placement plate 15, a third vertical side wall 16, a third opening 17, a first blind hole thread 18, a second blind hole thread 19, a first fixed section 20, a second telescopic section 21, a first support rotating roller 22, a first vertical auxiliary plate 23, a second vertical auxiliary plate 24, a detachable cover plate 1, a second through hole 26, a first lifting plate 27, a first section 28, a second section 29, a detachable auxiliary printing plate 1, a detachable auxiliary printing plate 2, a first rectangular groove 32, a second rectangular groove 33, a first rotating plate 34, a second rotating plate 35, a third section 36, a fourth section 37, a fourth through hole 38, a detachable raised strip 39, a first guiding inclined surface 40, a first guiding groove 41, a second guiding groove 42, a detachable airtight baffle 1, a detachable fixed flange 44, a first semi-circular protrusion 45, a storage box 46, a tapered guiding plate 47, and a movable spraying plate 48. Detailed implementation manners

[0033] The following further describes the present invention in conjunction with the accompanying drawings. The protection scope of the present invention is not limited to the following:

[0034] As Figures 1 to 9 shown, a solder mask printing device for a PCB board includes a printing device body 1. The interior of the printing device body 1 has a cavity structure, and a first auxiliary device 2 and a second auxiliary device 3 are provided on the outer side wall of the printing device body 1, enabling selection according to needs, and the first auxiliary device 2 and the second auxiliary device 3 are detachably fixed on the printing device body 1;

[0035] The printing device body 1 includes a first vertical side wall 4, a second vertical side wall 5, a first top plate 6, and a first bottom plate 7. A first opening 8 is provided on the first vertical side wall 4, a second opening 9 is provided on the second vertical side wall 5, and a detachable curtain 1 and a detachable curtain 2 are respectively provided on the first opening 8 and the second opening 9. A support pad is provided at the bottom of the printing device body 1. A first cavity 10 and a second cavity 11 are provided inside the printing device body 1, and a detachable partition 12 is provided between the first cavity 10 and the second cavity 11. A printing component is provided inside the second cavity 11. A detachable support plate 1 is provided on the first auxiliary device 2. The interior of the second auxiliary device 3 has a cavity structure, and the top is provided with a flow opening.

[0036] The volume of the second cavity 11 is larger than that of the first cavity 10. A detachable placing plate one 14 and a detachable placing plate two 15 are provided on the bottom of the detachable support plate one 13. A detachable drilling device is provided above the detachable support plate one 13. The auxiliary device one 2 includes a vertical side wall three 16, and an opening three 17 is provided on the vertical side wall three 16. The detachable support plate one 13 is placed on the detachable placing plate one 14 and the detachable placing plate two through the opening three 17 respectively.

[0037] A through hole one is provided on the auxiliary device one 2. The length of the detachable support plate one 13 is greater than the width of the auxiliary device one 2, so as to facilitate the placement of relevant PCB boards. Blind hole threads one 18 and blind hole threads two 19 are respectively provided on the bottoms of the opening one 8 and the opening two 9. A detachable telescopic support member one and a detachable telescopic support member two are respectively provided on the blind hole threads one 18 and the blind hole threads two 19.

[0038] The detachable support member one and the detachable support member two respectively include a fixed section one 20 and a telescopic section two 21 provided above the fixed section one 20. A support rotating roller one 22 is provided on the top of the telescopic section two 21. The printing member includes a vertical auxiliary plate one 23 and a vertical auxiliary plate two 24. A detachable cover plate one 25 is provided between the vertical auxiliary plate one 23 and the vertical auxiliary plate two 24. A through hole two 26 is provided in the middle of the detachable cover plate one 25. A lifting plate one 27 is provided on the through hole two 26, so as to be able to lift and print the PCB board.

[0039] A first section 28 and a second section 29 are provided on the top of the lifting plate one 27. The first section 28 and the second section 29 are integrally formed. Through holes three are respectively provided in the middle of the first section 28 and the second section 29. A detachable auxiliary printing plate one 30 and a detachable auxiliary printing plate two 31 are respectively provided on the through holes three. Both ends of the detachable auxiliary printing plate one 30 and the detachable auxiliary printing plate two 31 are fixed by bolts. A rectangular groove one 32 is provided on the detachable auxiliary printing plate one 30, and at least three rectangular grooves one 32 are provided. A vertical rectangular groove two 33 is provided on the top of the detachable auxiliary printing plate two 31, so as to be able to accumulate liquid to pre-immerse the back of the PCB board. The rectangular groove one 32 and the rectangular groove two 33 are arranged crosswise.

[0040] The length of the rectangular groove two 33 is less than the length of the rectangular groove one 32. Removable rotating universal wheels are provided on the tops of the removable auxiliary printing plate one 30 and the removable auxiliary printing plate two 31. Rotating plates one 34 and rotating plates two 35 are respectively provided at both ends of the removable cover plate one 25. Removable limiting components are provided at the ends of the rotating plate one 34 and the rotating plate two 35, and the removable limiting components can also block the excessive flow of relevant printing liquid to the auxiliary device one 2 or the auxiliary device two 3. And the rotating plate one 34 cooperates with the removable telescopic support component one, the rotating plate two 35 cooperates with the removable telescopic support component two, and the rotating plate one 34 and the rotating plate two 35 are hinge-rotatably connected to both ends of the removable cover plate one 25.

[0041] The structures of the rotating plate one 34 and the rotating plate two 35 are the same, and both are provided with a third section 36 and a fourth section 37. The third section 36 and the fourth section 37 are integrally formed. At least five columns of through holes four 38 and five removable raised strips 39 are provided on the third section 36. The through holes four 38 and the removable raised strips 39 are arranged alternately. A diversion inclined surface one 40 is provided between the fourth section 37 and the third section 36. A diversion groove one 41, a diversion groove two 42, a diversion groove three and a diversion groove four are provided at the bottom of the diversion inclined surface one 40.

[0042] Removable sealed baffles one 43 are provided on the diversion groove one 41, the diversion groove two 42, the diversion groove three and the diversion groove four. Removable fixing flanges 44 are provided at both ends of the removable sealed baffle one 43, and the fixing flanges 44 are fixed by bolts. Semi-circular protrusions one 45, semi-circular protrusions two, semi-circular protrusions three and semi-circular protrusions four are provided at the bottom of the removable sealed baffle one 43. The semi-circular protrusions one 45, the semi-circular protrusions two, the semi-circular protrusions three and the semi-circular protrusions four cooperate with any position of the diversion groove one 41, the diversion groove two 42, the diversion groove three and the diversion groove four, so as to be able to block.

[0043] The PCB board can be placed on the rotating plate one 34, the rotating plate two 35 or the lifting plate one 27. A movable spraying plate 48 is provided above the printing component. A number of spraying branch pipes are provided at the bottom of the movable spraying plate 48. A movable pipe one is provided above the movable spraying plate 48, and the movable pipe one can move freely on the removable partition one 12. A storage box 46 is provided on the top plate one 6, and a connecting hose one is provided between the storage box 46 and the movable pipe one.

[0044] A tapered diversion plate 47 is provided on one side of the removable sealed baffle one 43, so as to be able to move the printing liquid to both sides. And the tapered diversion plate 47 is removable. The ends of the rotating plate one 34 and the rotating plate two 35 are located above the auxiliary device one 2 and the auxiliary device two 3.

[0045] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A solder mask printing device for a PCB board, characterized in that: It includes a printing device body. The interior of the printing device body is a cavity structure, and an auxiliary device one and an auxiliary device two are provided on the outer side wall of the printing device body. The auxiliary device one and the auxiliary device two are detachably fixed to the printing device body; The printing device body includes a vertical side wall one, a vertical side wall two, a top plate one and a bottom plate one. An opening one is provided on the vertical side wall one, and an opening two is provided on the vertical side wall two. A detachable curtain one and a detachable curtain two are respectively provided on the opening one and the opening two. A support pad is provided at the bottom of the printing device body. A first cavity and a second cavity are provided inside the printing device body. A detachable partition one is provided between the first cavity and the second cavity. A printing component is provided inside the second cavity. A detachable support plate one is provided on the auxiliary device one. The interior of the auxiliary device two is a cavity structure, and the top is provided with a draining opening; Blind holes with threads one and two are respectively provided at the bottoms of the opening one and the opening two. A detachable telescopic support component one and a detachable telescopic support component two are respectively provided on the blind holes with threads one and two; The detachable telescopic support component one and the detachable telescopic support component two respectively include a fixed section one and a telescopic section two provided above the fixed section one. A support rotating roller one is provided at the top of the telescopic section two. The printing component includes a vertical auxiliary plate one and a vertical auxiliary plate two. A detachable cover plate one is provided between the vertical auxiliary plate one and the vertical auxiliary plate two. A through hole two is provided in the middle of the detachable cover plate one, and a lifting plate one is provided on the through hole two; A first section and a second section are provided at the top of the lifting plate one. The first section and the second section are integrally formed. Through holes three are respectively provided in the middles of the first section and the second section. A detachable auxiliary printing plate one and a detachable auxiliary printing plate two are respectively provided on the through holes three. Both ends of the detachable auxiliary printing plate one and the detachable auxiliary printing plate two are fixed by bolts. A rectangular groove one is provided on the detachable auxiliary printing plate one, and at least three rectangular grooves one are provided. A vertical rectangular groove two is provided on the top of the detachable auxiliary printing plate two. The rectangular groove one and the rectangular groove two are arranged crosswise; The length of the rectangular groove two is less than the length of the rectangular groove one. Detachable rotating universal wheels are provided on the tops of the detachable auxiliary printing plate one and the detachable auxiliary printing plate two. Rotating plates one and two are respectively provided at both ends of the detachable cover plate one. The rotating plate one cooperates with the detachable telescopic support component one. The rotating plate two cooperates with the detachable telescopic support component two. The rotating plate one and the rotating plate two are hinge-rotatably connected to both ends of the detachable cover plate one.

2. The solder mask printing device for a PCB board according to claim 1, characterized in that: The volume of the second cavity is larger than that of the first cavity. A detachable placing plate one and a detachable placing plate two are provided on the bottom of the detachable support plate one. A detachable drilling device is provided above the detachable support plate one. The auxiliary device one includes a vertical side wall three, and an opening three is provided on the vertical side wall three. The detachable support plate one is placed on the detachable placing plate one and the detachable placing plate two respectively through the opening three.

3. The solder mask printing device for a PCB board according to claim 2, characterized in that: A through hole one is provided on the auxiliary device one. The length of the detachable support plate one is greater than the width of the auxiliary device one.

4. A solder mask printing device for a PCB board according to claim 3, characterized in that: The rotating plate one and the rotating plate two have the same structure and both are provided with a third section and a fourth section. The third section and the fourth section are integrally formed. At least five columns of through holes four and five detachable protruding strips are provided on the third section. The through holes four and the detachable protruding strips are arranged alternately. A guiding inclined surface one is provided between the fourth section and the third section. A guiding groove one, a guiding groove two, a guiding groove three and a guiding groove four are provided on the bottom of the guiding inclined surface one.

5. The solder mask printing device for a PCB board according to claim 4, characterized in that: Detachable sealing baffles one are provided on the guiding groove one, the guiding groove two, the guiding groove three and the guiding groove four. Detachable fixing flanges are provided at both ends of the detachable sealing baffle one, and the fixing flanges are fixed by bolts. Semi-circular protrusions one, semi-circular protrusions two, semi-circular protrusions three and semi-circular protrusions four are provided on the bottom of the detachable sealing baffle one. The semi-circular protrusions one, semi-circular protrusions two, semi-circular protrusions three and semi-circular protrusions four are matched with any position of the guiding groove one, the guiding groove two, the guiding groove three and the guiding groove four.

6. The solder mask printing device for a PCB board according to claim 5, wherein: The PCB board can be placed on the rotating plate one, the rotating plate two or the lifting plate one. A movable spraying plate is provided above the printing component. A number of spraying branch pipes are provided on the bottom of the movable spraying plate. A movable pipe one is provided above the movable spraying plate, and the movable pipe one can move freely on the detachable partition one. A storage box is provided on the top plate one, and a connecting hose one is provided between the storage box and the movable pipe one.

7. A solder mask printing device for a PCB board according to claim 6, characterized in that: A tapered guiding plate is provided on one side of the detachable sealing baffle one, and the tapered guiding plate is detachable. The ends of the rotating plate one and the rotating plate two are located above the auxiliary device one and the auxiliary device two.

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