Printed wiring board for color facsimile communication system

Abstract

The application discloses a printed circuit board for color facsimile communication system and relates to the technical field of circuit boards. A plurality of embedding entrances are formed on the main circuit board, and two embedded plates are detachably connected in the embedding entrances. A limiting structure is arranged in the embedding entrance and is fixed on the inner walls on the two sides of the embedding entrance. A fixing shaft is connected to the central position of the embedding entrance. The embedded plate comprises a surface layer and an embedded layer. The embedded layer comprises a concave strip, a bonding strip and two positioning strips. The concave strip is in the shape of a 'Fang' and is fixed on the middle position of the bottom surface of the surface layer. The concave part of the concave strip is away from the surface layer and is in the shape of a semicircle with the same radius as the cross section of the fixing shaft. The bonding strip is fixed on the bottom surface of the surface layer. The two positioning strips are respectively fixed on the two sides of the bottom surface of the surface layer. When the embedded plate on the circuit board is replaced by an operator, the embedded plate does not need to be taken out from the embedding groove on the circuit board, replaced and then put back into the embedding groove, so that the technical effect of simplifying the operation steps and reducing the labor intensity is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit boards, and in particular to a printed circuit board for a color fax communication system. Background Art

[0002] Color fax communication systems utilize scanning technology to decompose a fixed document into numerous pixels at the transmitting end, converting these pixels into a series of connected electrical signals for transmission to a distant destination. The various printed circuits in electronic communication system equipment are the functional organs of the system hardware, similar to the various organs that make up the human body. The printed circuit boards (PCBs) in systems and end products are the carriers of these circuits, serving as the backbone, nerves, and blood vessels of the hardware circuits. Currently, after electronic components are connected and soldered to the PCB, if a portion of the printed circuit board is damaged during soldering or if a component is damaged during use, the entire PCB must be replaced, which is very costly.

[0003] Chinese invention patent authorization publication number CN111447734B discloses a portable circuit board. The circuit board body is provided with a plurality of recesses, in which two symmetrically arranged panels are removably placed. The printed circuit on the top surface of the circuit board body and the printed circuit on the top surface of the panel are the same conductive circuit. The recesses are provided with a limiting structure for limiting the position of the two replacement panels. If a part of the printed circuit is damaged during welding or a part of the electronic component is damaged during use, the operator can remove the panel from the recess and replace it, thereby saving costs.

[0004] Although the above device saves the production cost of printed circuit boards, the operator needs to remove the panels from the grooves on the circuit board and replace them, and then put the panels back into the grooves. This operation is cumbersome and labor-intensive. Summary of the Invention

[0005] The embodiments of the present application provide a printed circuit board for a color fax communication system, which solves the technical problem in the prior art that when an operator replaces panels on a circuit board, the operator needs to sequentially remove the panels from the mounting slots on the circuit board, replace them, and then install them back into the mounting slots, which is cumbersome and labor-intensive. The embodiment of the present application provides a printed circuit board for a color fax communication system, which solves the technical problem that when an operator replaces panels on a circuit board, the operator needs to sequentially remove the panels from the mounting slots on the circuit board, replace them, and then install them back into the mounting slots, thereby simplifying the operation steps and reducing labor intensity.

[0006] The embodiment of the present application provides a printed circuit board for a color fax communication system, comprising a main circuit board, wherein the main circuit board is provided with a plurality of insertion openings, and two inserts are detachably connected in the insertion openings;

[0007] The insertion opening is provided with a limiting structure for limiting two inserted plates, and the limiting structure is fixed on the inner walls on both sides of the insertion opening;

[0008] A fixed shaft is connected to the central position of the insertion opening, and the outer shape of the fixed shaft is cylindrical;

[0009] The inserted plate includes a surface layer and an inserted layer where a printed circuit is arranged;

[0010] The inserted layer includes a concave strip, a fitting strip and two positioning strips;

[0011] The concave strip is in the shape of "匚", and is fixed at the middle position of the bottom surface of the surface layer. The recessed part on the concave strip is far from the surface layer and the recessed shape is a semi - circle with the same radius as the cross - sectional circle radius of the fixed shaft;

[0012] The fitting strip is fixed on the bottom surface of the surface layer;

[0013] The two positioning strips are respectively fixed on both sides of the bottom surface of the surface layer. The end of the positioning strip far from the concave strip extends out of the surface layer towards the direction of the nearest limiting structure, and the end face of the positioning strip extending out of the surface layer is an arc surface.

[0014] The top surface of the surface layer is the surface where the printed circuit is arranged. The surface opposite to the top surface is the bottom surface of the surface layer. The width of the top surface of the surface layer is greater than the width of the bottom surface, and the two side surfaces of the surface layer are arc surfaces;

[0015] The main circuit board further includes limiting strips. Each group of limiting structures includes two limiting strips respectively located on the opposite inner walls on both sides of the insertion opening;

[0016] The concave strip, the fitting strip and the positioning strip have the same length, and the distribution direction of the three is the same as the direction of the limiting strip;

[0017] When the two inserted plates are inserted into the insertion opening, the side of the limiting strip close to the inserted plate is in contact with the inserted plate. The side of the limiting strip far from the inserted plate is an arc surface, and the minimum distance between this arc surface and the center line of the fixed shaft is not less than half of the width of the surface layer;

[0018] The material of the limiting strip is rubber, so that when pressing the inserted plate to rotate the two inserted plates 180 degrees around the fixed shaft, it will not be hindered by the limiting strip.

[0019] The height of the concave strip is equal to half of the height of the fitting strip;

[0020] The height of the positioning strip is equal to half of the height of the fitting strip;

[0021] The width of the inserted layer is not greater than the width of the top surface of the surface layer.

[0022] The number of the fitting strips is multiple, and there is a gap with the size of a fitting strip between two adjacent fitting strips;

[0023] The position of the fitting strip on one side of the concave strip and the position of the gap on the other side of the concave strip are symmetrical with respect to the concave strip. When the inlay layers of the two panels are fitted on the fixed axis, the fitting strips on the two panels are joined together, and the concave positions of the two concave strips are closely attached to the fixed axis.

[0024] The material of the embedded layer is rubber.

[0025] The fixed axis is parallel to the limiting strip and has the same length as the limiting strip, and the center point of the fixed axis is the same as the center point of the embedding opening;

[0026] The radius of the fixed shaft cross-section circle is smaller than the height of the embedded layer.

[0027] The main circuit board is provided with a capsule groove and a fixing groove;

[0028] The fixed shaft includes an elastic capsule and a support body;

[0029] The elastic sac is cylindrical after expansion, with one end of the elastic sac close to the panel fixed to the support body, and the other end of the elastic sac away from the panel fixed to the inner wall of the sac groove. When the elastic sac expands, it expands along the inner wall of the sac groove.

[0030] The support body is a cylinder, and a limiting block is fixed on one end of the support body away from the elastic capsule;

[0031] The limit block is a cylinder, the radius of the cross section of the limit block is greater than the radius of the cross section of the support body, and the central axes of the limit block and the support body are the same straight line;

[0032] The sum of the lengths of the limiting block and the supporting body is equal to the length of the limiting strip;

[0033] The radius of the cross-section circle of the support body is smaller than the height of the embedded layer.

[0034] The internal space shapes of the capsule groove and the fixing groove are both cylindrical;

[0035] The cross-sectional radius of the cylinder formed by the internal space of the capsule groove is the same as the cross-sectional radius of the support body, the cross-sectional radius of the cylinder formed by the internal space of the fixing groove is the same as the cross-sectional radius of the limit block, and the limit block is slidably connected to the inner wall of the fixing groove so that the limit block can slide along the inner wall of the fixing groove;

[0036] The depth of the capsule groove is greater than the depth of the fixing groove;

[0037] The fixing axis, the capsule groove and the fixing groove are located on the same straight line.

[0038] The main circuit board is provided with an air guide channel;

[0039] The end of the air guide channel close to the fixed axis passes through the inner wall of the capsule groove and is connected to the internal space of the elastic capsule, and the end of the air guide channel away from the fixed axis is connected to the space outside the circuit board;

[0040] An air valve is provided at one end of the air guide channel away from the fixed axis. After the air valve is connected to an external air pump, the elastic bag is inflated or deflated through the air guide channel.

[0041] The maximum length of the elastic sac after expansion along the inner wall of the sac groove is equal to the sum of the depths of the fixed groove and the sac groove, and the length of the elastic sac after shrinking back to the normal state without external stretching along the inner wall of the sac groove is equal to the depth of the sac groove.

[0042] The radius of the cross-section circle of the limiting block is equal to the height of the positioning strip of the bonding strip;

[0043] The length of the limit block is half of the radius of the cross-section of the limit block, and the depth of the fixing groove is greater than the length of the limit block;

[0044] A groove of the same size as the limit block is formed on one end of the panel close to the limit block. When the elastic bag contracts and drives one end of the limit block to move out of the fixing groove, the limit block is embedded in the groove, so that the panel will not be hindered by the limit block when it is lifted.

[0045] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0046] By providing a through embedding opening on the main circuit board, a fixed shaft is fixedly connected to the embedding opening, and concave strips and fitting strips are provided on the embedding layer of the panel, the embedding layers of the two panels are fitted on the fixed shaft through the fitting strips, and the concave strips in the middle of the embedding layers of the two panels are tightly attached to the fixed shaft. When replacing the panels, it is only necessary to press the panels and rotate the two panels 180 degrees around the fixed shaft to complete the replacement; this effectively solves the technical problem in the prior art that when operators replace panels on a circuit board, they need to remove the panels from the embedding grooves on the circuit board, replace them, and then install them back into the embedding grooves, which is a cumbersome and labor-intensive operation. In addition, when operators replace panels on a circuit board, they do not need to remove the panels from the embedding grooves on the circuit board one by one, replace them, and then install them back into the embedding grooves, thereby simplifying the operation steps and reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of the circuit board structure of a printed circuit board for a color fax communication system of the present invention;

[0048] Figure 2 Schematic diagram of the fixed axis of the printed circuit board for the color fax communication system of the present invention;

[0049] Figure 3FIG1 is a panel structure diagram of a printed circuit board for a color fax communication system of the present invention;

[0050] Figure 4 A schematic diagram of a panel of a printed circuit board for a color fax communication system of the present invention;

[0051] Figure 5 A schematic diagram of the panel structure of a printed circuit board for a color fax communication system of the present invention;

[0052] Figure 6 FIG1 is a schematic diagram of a panel flip of a printed circuit board for a color fax communication system according to the present invention;

[0053] Figure 7 This is a structural diagram of a fixed axis of a printed circuit board for a color fax communication system of the present invention;

[0054] Figure 8 Schematic diagram of the fixed axis of the printed circuit board for the color fax communication system of the present invention;

[0055] Figure 9 Schematic diagram of the capsule slot of the printed circuit board for the color fax communication system of the present invention;

[0056] Figure 10 A schematic diagram of a valve of a printed circuit board for a color fax communication system of the present invention;

[0057] Figure 11 Schematic diagram of the fixing groove of the printed circuit board for the color fax communication system of the present invention.

[0058] In the picture:

[0059] Main circuit board 100, connection hole 110, embedding port 120, limiting strip 130, capsule groove 140, fixing groove 150, air guide channel 160, valve 161; fixed shaft 200, elastic capsule 210, support body 220, limiting block 230; panel 300, surface layer 310, embedding layer 320, concave strip 321, fitting strip 322, positioning strip 323. DETAILED DESCRIPTION

[0060] To facilitate understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0061] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are for illustrative purposes only and do not represent the only implementation method.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains; the terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0063] See also Figure 1 , is a schematic diagram of the circuit board structure of a printed circuit board for a color fax communication system of the present invention. The printed circuit board for a color fax communication system of the present invention includes a main circuit board 100, a fixed shaft 200, and a panel 300. The main circuit board 100 is provided with a through insertion opening 120, to which the fixed shaft 200 is fixedly connected. The inserting layer 320 of the panel 300 is provided with a concave strip 321 and a bonding strip 322. The inserting layers 320 of the two panels 300 are bonded to the fixed shaft 200 via the bonding strip 322. The concave strip 321 in the middle of the inserting layers 320 of the two panels 300 is tightly bonded to the fixed shaft 200. When replacing the panels 300, the panel 300 only needs to be pressed to rotate the two panels 300 around the fixed axis 200 by 180 degrees. This effectively solves the technical problem in the prior art that when replacing the panels 300 on the circuit board, the operator needs to remove the panels 300 from the mounting grooves on the circuit board, replace them, and then install them back into the mounting grooves, which is cumbersome and labor-intensive. In addition, when replacing the panels 300 on the circuit board, the operator does not need to remove the panels 300 from the mounting grooves on the circuit board, replace them, and then install them back into the mounting grooves one by one, thereby simplifying the operation steps and reducing labor intensity.

[0064] Example 1

[0065] like Figure 1 and Figure 2As shown, the printed circuit board for the color fax communication system of the present application includes a main circuit board 100, a fixed shaft 200 and a panel 300; the main circuit board 100 is the main body of the circuit board, and the main circuit board 100 includes connection holes 110, an embedding opening 120 and a limiting strip 130; the connection holes 110 are located at the four corners of the main circuit board 100 and are used to install the circuit board on the corresponding equipment; the main circuit board 100 is provided with a plurality of through-embedding openings 120, and two panels 300 are detachably connected in the embedding openings 120. The printed circuit on the top surface of the main circuit board 100 and the circuit on the panel 300 are the same conductive circuit; the embedding openings 120 are provided with a limiting structure for limiting the two panels 300, and the limiting structure is fixed to the embedding openings 120. On the inner walls on both sides, each set of limiting structures includes two limiting strips 130 located on the opposite inner walls on both sides of the embedding opening 120; the length of the limiting strips 130 is the same as the length of the embedding opening 120 (that is, the length of the side in the same direction as the limiting strips 130), the length of the embedding opening 120 is the same as the length of the corresponding panel 300 (that is, the length of the side in the same direction as the limiting strips 130), the width of the embedding opening 120 (that is, the length of the side perpendicular to the length direction of the embedding opening 120 in the horizontal plane) is the same as the width of the corresponding panel 300 (that is, the length of the side perpendicular to the length direction of the panel 300 in the horizontal plane), and half of the height of the embedding opening 120 is the same as the height of a single panel 300, so that two panels 300 can be spliced ​​together with the embedding opening 120.

[0066] The fixed shaft 200 is a cylinder, and both ends of the fixed shaft 200 are fixed on the inner wall of the insertion opening 120. The fixed shaft 200 is parallel to the limiting strip 130 and has the same length. The center point of the fixed shaft 200 is the same as the center point of the insertion opening 120.

[0067] like Figure 3 and Figure 4As shown, the panel 300 includes a surface layer 310 and an embedded layer 320; the surface layer 310 is the part of the top surface of the panel 300 where a printed circuit is arranged, and the embedded layer 320 is the bottom part of the panel 300 opposite to the surface layer 310; the top surface of the surface layer 310 is the surface where the printed circuit is arranged, the surface opposite to the top surface is the bottom surface of the surface layer 310, the width of the top surface of the surface layer 310 is greater than the width of the bottom surface, and the two side surfaces of the surface layer 310 are arc surfaces; the embedded layer 320 includes a concave strip 321, a fitting strip 322 and a positioning strip 323; the concave strip 321 is in the shape of a "匚", the concave strip 321 is fixed at the middle position of the bottom surface of the surface layer 310, the sunken position on the concave strip 321 is far from the surface layer 310 and the sunken shape on the concave strip 321 is a semi-circle; the fitting strip 322 is a cuboid, and the fitting strip 322 is fixed on the bottom surface of the surface layer �10; the number of the positioning strips 323 is two, the two positioning strips 323 are respectively fixed on both sides of the bottom surface of the surface layer 310, the end of the positioning strip 323 far from the concave strip 321 extends out of the surface layer 310 towards the direction of the nearest limiting structure, and the end face of the positioning strip 323 extending out of the surface layer 310 is an arc surface; the lengths of the concave strip 321, the fitting strip 322 and the positioning strip 323 are the same, and the distribution direction of the three is the same as the direction of the limiting strip 130.

[0068] Further, the radius of the cross-sectional circle of the fixed shaft 200 is smaller than the height of the embedded layer 320, the sunken shape of the concave strip 321 is a semi-circle, and the radius of the semi-circle is the same as the radius of the cross-sectional circle of the fixed shaft 200; the height of the concave strip 321 is equal to half of the height of the fitting strip 322; the height of the positioning strip 323 is equal to half of the height of the fitting strip 322; the width of the embedded layer 320 is not greater than the width of the top surface of the surface layer 310.

[0069] Further, as Figure 5 and Figure 6 shown, the number of the fitting strips 322 is multiple, there is a gap with the size of a fitting strip 322 between two adjacent fitting strips 322, and the positions of the fitting strips 322 on one side of the concave strip 321 and the positions of the gaps on the other side of the concave strip 321 are symmetrical with respect to the concave strip 321, so that when the embedded layers 320 of two panels 300 are fitted on the fixed shaft 200, the fitting strips 322 on the two panels 300 are joined together, and at this time, the sunken positions of the two concave strips 321 are closely attached to the fixed shaft 200; the material of the embedded layer 320 is rubber.

[0070] Furthermore, when the two panels 300 are embedded in the embedding opening 120, the side of the limiting strip 130 close to the panel 300 is in contact with the panel 300, and the side of the limiting strip 130 away from the panel 300 is an arcuate surface, and the minimum distance between the arcuate surface and the center line of the fixed axis 200 is not less than half the width of the surface layer 310; the limiting strip 130 is made of rubber, so that when the panel 300 is pressed to rotate the two panels 300 180 degrees around the fixed axis 200, they will not be hindered by the limiting strip 130.

[0071] When replacing the panel 300 of the printed circuit board for the color fax communication system according to the embodiment of the present application, the steps are as follows:

[0072] S1: The operator first presses the panel 300 to rotate the two panels 300 180 degrees around the fixed axis 200, so that the printed circuit on the replaced panel 300 is aligned with the printed circuit on the main circuit board 100;

[0073] S2: The operator fixes the corresponding electronic components on the corresponding panel 300 by plugging or soldering;

[0074] S3: After the electronic components are connected, the operator connects the printed circuit on the replaced panel 300 to the printed circuit on the main circuit board 100 by soldering.

[0075] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0076] The present invention solves the technical problem in the prior art that when an operator replaces a panel 300 on a circuit board, the operator needs to remove the panel 300 from the mounting groove on the circuit board and then install it back into the mounting groove, which is cumbersome and labor-intensive. Instead, the operator can replace the panel 300 on the circuit board by simply pressing the panel 300 and rotating the two panels 300 180 degrees around the fixed axis 200, thereby simplifying the operation steps and reducing labor intensity.

[0077] Example 2

[0078] During the replacement of panel 300 for the color fax communication system printed circuit board in the above-described embodiment, it was discovered that if the circuit board was already secured to a fixture or device, such that the bottom surface of the circuit board was relatively close to the fixture or device, there would be insufficient space for panel 300 to be flipped over on the main circuit board 100. This embodiment of the present application optimizes the structure of the main circuit board 100 and the fixing shaft 200 based on the above-described embodiment.

[0079] like Figures 7 to 11As shown, the main circuit board 100 is provided with a capsule groove 140 and a fixing groove 150; the fixed shaft 200 includes an elastic capsule 210 and a support body 220; the shape of the elastic capsule 210 after expansion is cylindrical, and the end of the elastic capsule 210 close to the panel 300 is fixed to the support body 220, and the end of the elastic capsule 210 away from the panel 300 is fixed to the inner wall of the capsule groove 140. When the elastic capsule 210 expands, it expands along the inner wall of the capsule groove 140; the support body 220 is a cylinder, and a limit block 230 is fixed on the end of the support body 220 away from the elastic capsule 210; the limit block 230 is a cylinder, the radius of the cross-sectional circle of the limit block 230 is greater than the radius of the cross-sectional circle of the support body 220, and the central axis of the limit block 230 and the support body 220 is the same straight line; The sum of the lengths of the limit block 230 and the support body 220 is equal to the length of the limit strip 130; the radius of the cross-sectional circle of the support body 220 is smaller than the height of the embedded layer 320; the internal space shapes of the capsule groove 140 and the fixed groove 150 are both cylindrical; the cross-sectional circle radius of the cylinder formed in the internal space of the capsule groove 140 is the same as the cross-sectional circle radius of the support body 220, and the cross-sectional circle radius of the cylinder formed in the internal space of the fixed groove 150 is the same as the cross-sectional circle radius of the limit block 230, and the limit block 230 is slidably connected to the inner wall of the fixed groove 150, so that the limit block 230 can slide along the inner wall of the fixed groove 150; the depth of the capsule groove 140 is greater than the depth of the fixed groove 150; the fixed axis 200, the capsule groove 140 and the fixed groove 150 are located on the same straight line.

[0080] The main circuit board 100 is provided with an air guide channel 160; the end of the air guide channel 160 close to the fixed axis 200 passes through the inner wall of the capsule groove 140 and is connected to the internal space of the elastic capsule 210, and the end of the air guide channel 160 away from the fixed axis 200 is connected to the space outside the circuit board; the end of the air guide channel 160 away from the fixed axis 200 is provided with an air valve 161, which is connected to an external air pump to inflate or exhaust the elastic capsule 210 through the air guide channel 160; when the elastic capsule 210 is in an expanded state, the elastic capsule 210 is inflated. Under the push of the elastic sac 210, one end of the fixed shaft 200 with the limit block 230 rests against the fixed groove 150; when the panel 300 in the embedding port 120 needs to be replaced, an external air pump is used to evacuate the elastic sac 210 to shrink the elastic sac 210. Driven by the elastic sac 210, the end of the fixed shaft 200 with the limit block 230 moves out of the fixed groove 150; after turning off the air pump, the panel 300 is pressed to lift the end of the panel 300 close to the limit block 230. At this time, the two panels 300 have enough space to flip 180 degrees.

[0081] Furthermore, the maximum length of the elastic sac 210 after expanding along the inner wall of the sac groove 140 is equal to the sum of the depths of the fixed groove 150 and the sac groove 140, and the length of the elastic sac 210 after shrinking along the inner wall of the sac groove 140 back to a normal state without being stretched by external force is equal to the depth of the sac groove 140.

[0082] Furthermore, the radius of the cross-sectional circle of the limit block 230 is equal to the height of the positioning strip 323 of the fitting strip 322; the length of the limit block 230 is one-half of the radius of the cross-sectional circle of the limit block 230, and the depth of the fixing groove 150 is greater than the length of the limit block 230; a groove of the same size as the limit block 230 is formed on the end of the panel 300 close to the limit block 230. When the elastic capsule 210 contracts and drives one end of the limit block 230 to move out of the fixing groove 150, the limit block 230 is embedded in the groove, so that the panel 300 will not be hindered by the limit block 230 when it is lifted.

[0083] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0084] When the circuit board is fixed on a fixture or device so that the bottom surface of the circuit board is close to the fixture or device, the fixing shaft 200 is lifted from the main circuit board 100 so that the two panels 300 attached to the fixing shaft 200 have enough space to flip over.

[0085] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations are readily apparent to those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A printed circuit board for a color fax communication system, comprising a main circuit board (100), characterized in that: The main circuit board (100) has a number of embedding ports (120), and two embedding plates (300) are detachably connected in the embedding ports (120); a limiting structure for limiting the two embedding plates (300) is provided in the embedding ports (120), and the limiting structure is fixed on the inner walls on both sides of the embedding ports (120). A fixed shaft (200) is connected to the center position of the embedding port (120), and the outer shape of the fixed shaft (200) is cylindrical. The embedding plate (300) includes a surface layer (310) and an embedding layer (320) for arranging printed circuits. The embedding layer (320) includes a concave strip (321), a fitting strip (322) and two positioning strips (323). The concave strip (321) is in the shape of "匚", and is fixed at the middle position of the bottom surface of the surface layer (310). The recessed part on the concave strip (321) is away from the surface layer (310) and the recessed shape is a semi-circle with the same radius as the cross-sectional circle radius of the fixed shaft (200); the fitting strip (322) is fixed on the bottom surface of the surface layer (310). The two positioning strips (323) are respectively fixed on both sides of the bottom surface of the surface layer (310). The end of the positioning strip (323) away from the concave strip (321) extends out of the surface layer (310) towards the direction of the nearest limiting structure, and the end face of the positioning strip (323) extending out of the surface layer (310) is an arc surface. The top surface of the surface layer (310) is the surface for arranging printed circuits, the surface opposite to the top surface is the bottom surface of the surface layer (310). The width of the top surface of the surface layer (310) is greater than the width of the bottom surface, and the two side surfaces of the surface layer (310) are arc surfaces. The main circuit board (100) further includes limiting strips (130). Each group of limiting structures includes two limiting strips (130) respectively located on the opposite inner walls on both sides of the embedding port (120). The concave strip (321), the fitting strip (322) and the positioning strip (323) have the same length, and the distribution directions of the three are the same as the direction of the limiting strip (130). When the two embedding plates (300) are embedded in the embedding port (120), the side of the limiting strip (130) close to the embedding plate (300) is in contact with the embedding plate (300). The side of the limiting strip (130) away from the embedding plate (300) is an arc surface, and the minimum distance between this arc surface and the center line of the fixed shaft (200) is not less than half of the width of the surface layer (310). The material of the limiting strip (130) is rubber, so that when the embedding plate (300) is pressed to rotate the two embedding plates (300) 180 degrees around the fixed shaft (200), it will not be hindered by the limiting strip (130).

2. The printed wiring board for a color facsimile communication system according to claim 1, wherein: The height of the concave strip (321) is equal to half of the height of the fitting strip (322). The height of the positioning strip (323) is equal to half of the height of the fitting strip (322). The width of the embedding layer (320) is not greater than the width of the top surface of the surface layer (310).

3. The printed wiring board for a color facsimile communication system according to claim 2, wherein: The number of the fitting strips (322) is multiple, and there is a gap with the size of a fitting strip (322) between two adjacent fitting strips (322). The position of the fitting strip (322) on one side of the concave strip (321) and the position of the gap on the other side of the concave strip (321) are symmetrical with respect to the concave strip (321); when the inlay layers (320) of the two panels (300) are fitted on the fixed shaft (200), the fitting strips (322) on the two panels (300) are joined together, and at this time, the concave positions of the two concave strips (321) are closely attached to the fixed shaft (200); The material of the embedded layer (320) is rubber.

4. The printed wiring board for a color facsimile communication system according to claim 3, wherein: The fixed axis (200) is parallel to the limiting strip (130) and has the same length, and the center point of the fixed axis (200) is the same as the center point of the embedding opening (120); The radius of the cross-section of the fixed shaft (200) is smaller than the height of the embedded layer (320).

5. The printed wiring board for a color facsimile communication system according to claim 3, wherein: The main circuit board (100) is provided with a capsule groove (140) and a fixing groove (150); The fixed shaft (200) includes an elastic capsule (210) and a support body (220); The elastic sac (210) is cylindrical in shape after expansion. One end of the elastic sac (210) close to the panel (300) is fixed to the support body (220), and one end of the elastic sac (210) away from the panel (300) is fixed to the inner wall of the sac groove (140). When the elastic sac (210) expands, it expands along the inner wall of the sac groove (140). The support body (220) is a cylinder, and a limiting block (230) is fixed on one end of the support body (220) away from the elastic capsule (210); The limiting block (230) is a cylinder, the radius of the cross-section of the limiting block (230) is greater than the radius of the cross-section of the support body (220), and the central axes of the limiting block (230) and the support body (220) are the same straight line; The sum of the lengths of the limiting block (230) and the supporting body (220) is equal to the length of the limiting strip (130); The radius of the cross-sectional circle of the support body (220) is smaller than the height of the embedded layer (320).

6. The printed wiring board for a color facsimile communication system according to claim 5, wherein: The internal spaces of the capsule groove (140) and the fixing groove (150) are both cylindrical in shape; The cross-sectional radius of the cylinder formed by the internal space of the capsule groove (140) is the same as the cross-sectional radius of the support body (220), the cross-sectional radius of the cylinder formed by the internal space of the fixing groove (150) is the same as the cross-sectional radius of the limit block (230), and the limit block (230) is slidably connected to the inner wall of the fixing groove (150), so that the limit block (230) can slide along the inner wall of the fixing groove (150); The depth of the capsule groove (140) is greater than the depth of the fixing groove (150); The fixed axis (200), the capsule groove (140) and the fixed groove (150) are located on the same straight line.

7. The printed wiring board for a color facsimile communication system according to claim 6, wherein: An air guide channel (160) is provided on the main circuit board (100); An end of the air guide channel (160) close to the fixed shaft (200) passes through the inner wall of the capsule groove (140) and is connected to the internal space of the elastic capsule (210), and an end of the air guide channel (160) away from the fixed shaft (200) is connected to the space outside the circuit board; An air valve (161) is provided at one end of the air guide channel (160) away from the fixed shaft (200). The air valve (161) is connected to an external air pump to inflate or deflat the elastic bag (210) through the air guide channel (160).

8. The printed wiring board for a color facsimile communication system according to claim 7, wherein: The maximum length of the elastic sac (210) after expansion along the inner wall of the sac groove (140) is equal to the sum of the depths of the fixing groove (150) and the sac groove (140), and the length of the elastic sac (210) after shrinking along the inner wall of the sac groove (140) back to a normal state without being stretched by external force is equal to the depth of the sac groove (140).

9. The printed wiring board for a color facsimile communication system according to claim 8, wherein: The radius of the cross-section circle of the limiting block (230) is equal to the height of the positioning strip (323) of the fitting strip (322); The length of the limiting block (230) is half the radius of the cross-section of the limiting block (230), and the depth of the fixing groove (150) is greater than the length of the limiting block (230); A groove having the same size as the limit block (230) is formed on one end of the panel (300) close to the limit block (230); when the elastic capsule (210) contracts and drives one end of the limit block (230) to move out of the fixing groove (150), the limit block (230) is embedded in the groove, so that the panel (300) will not be hindered by the limit block 230 when it is lifted.

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