A circuit board automatic up and down plate machine system

Abstract

The application discloses a kind of circuit board automatic upper and lower plate machine systems, it is related to circuit board processing and automatic feeding and discharging technical field.The system includes plate feeder, lower plate machine, conveying component and fixture;Fixture includes bearing plate and press plate, both are respectively provided with corresponding positioning hole each other.The first plate taking component of plate feeder includes suction cup for taking and placing press plate and positioning pin, positioning pin passes through the positioning hole of press plate and is inserted into the positioning hole of bearing plate in the state that suction cup absorbs press plate, to guide correction and positioning to press plate before suction cup releases press plate.Thereby it can improve the positional accuracy when press plate is repeatedly taken and placed and reset, reduce the possibility of press plate transverse misplacement and circuit board deviation, and be favorable to realize circuit board automatic loading and unloading and fixture circulation conveying.

Description

Technical Field

[0001] This invention relates to the field of circuit board processing and automatic loading and unloading technology, specifically to a circuit board fixture for carrying, positioning and pressing circuit boards, and a loading and unloading machine system capable of automatically loading, unloading and recycling circuit boards from the fixture, which is particularly suitable for the continuous production of flexible circuit boards. Background Technology

[0002] In the processing of flexible circuit boards (PCBs), including printing, surface mount, translation, and reflow soldering, fixtures are typically used to support, flatten, and position the boards, while pressing components maintain the boards' position relative to the fixtures. Around the same fixture, repeated operations such as removing pressing components, loading PCBs, resetting pressing components, unloading processed PCBs, and transferring fixtures are required. In current production, these operations are often performed manually or in segments by independent mechanisms, requiring manual intervention or repositioning between each stage. This results in numerous operational steps, insufficient equipment coordination, and difficulty in establishing a stable and continuous automated process.

[0003] Because flexible circuit boards are thin and prone to bending, wrinkling, or displacement, even small lateral deviations can cause misalignment of the boards, skewed pressing edges, or dragging of the flexible circuit board when the pressing plate is picked up and placed back on the carrier plate. If there is no direct mechanical guidance and positioning during the pressing plate's approach to the carrier plate, relying solely on the stopping position of the pick-and-place mechanism or the contact between the pressing plate and the carrier plate is insufficient to guarantee stable reset after multiple pick-and-place operations. This can also lead to pick-and-place interference, board displacement, and production cycle fluctuations. Therefore, how to guide and correct the lateral position of the pressing plate relative to the carrier plate during each pick-and-place and reset process, and achieve repeatable mechanical positioning, while simultaneously accommodating automatic board loading and unloading and fixture cyclic transport, is a technical problem that needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic board loading and unloading machine system for circuit boards, so as to at least solve the problems of lack of reliable guidance and positioning of the pressing plate during repeated loading, unloading and resetting, easy lateral misalignment relative to the carrier plate, and further affecting the positional stability and continuous automatic operation of the flexible circuit board.

[0005] To achieve the above objectives, the present invention provides an automatic circuit board loading and unloading machine system, including a loading machine, a unloading machine, a conveying assembly, and a fixture; the loading machine includes a first bearing assembly, a first board picking assembly, and a loading assembly; the unloading machine includes a second bearing assembly, a second board picking assembly, and a unloading assembly; the conveying assembly is disposed between the loading machine and the unloading machine; the fixture includes a bearing plate and a pressing plate detachably disposed on the bearing plate; the first board picking assembly includes a mounting plate, a suction cup disposed on the lower surface of the mounting plate for picking up or releasing the pressing plate, and a positioning pin disposed on the lower surface of the mounting plate; the bearing plate and the pressing plate are separate... The fixture is provided with corresponding positioning holes that cooperate with the positioning pins. The lower end of the positioning pin is tapered and can pass through the positioning hole of the pressing plate and insert into the positioning hole of the support plate while the suction cup is picking up the pressing plate. This guides and corrects the lateral position of the pressing plate relative to the support plate and positions the two before the suction cup releases the pressing plate. The first support assembly, the first plate picking assembly, and the upper plate assembly cooperate to complete the circuit board loading. The second support assembly, the second plate picking assembly, and the lower plate assembly cooperate to complete the circuit board unloading. The conveying assembly conveys the fixture with the circuit board unloaded to the upper plate machine.

[0006] Preferably, the fixture includes a support plate and a pressing plate disposed on the support plate, wherein the support plate is embedded with a magnet for attracting the pressing plate, and a circuit board is located between the support plate and the pressing plate.

[0007] Preferably, the upper plate machine further includes a first body and a first double belt module disposed on the first body, the first bearing component and the first plate picking component are respectively connected to the first double belt module and can be raised and lowered respectively, and the upper plate component is disposed on the first body; the lower plate machine further includes a second body and a second double belt module disposed on the second body, the second bearing component and the second plate picking component are respectively connected to the second double belt module and can be raised and lowered respectively, and the lower plate component is disposed on the second body.

[0008] Preferably, the first bearing component includes two first upright plates that are connected to each other and spaced apart, one of which is connected to the first double belt module, and the two first upright plates are respectively provided with first bearing guide rails on their opposite inner sides, and the two first bearing guide rails together form the bearing space of the fixture.

[0009] Preferably, the first plate-removing assembly further includes a connecting seat, which is connected to the first dual-belt module, and the mounting plate is fixedly connected to the connecting seat; multiple suction cups are spaced apart on the lower surface of the mounting plate. During plate removal, the positioning pin enters the positioning holes of the pressing plate and the support plate, and the suction cups pick up the pressing plate; during resetting, the positioning pin passes through the positioning hole of the pressing plate picked up by the suction cup, and its tapered lower end is guided into the positioning hole of the support plate as the first plate-removing assembly descends to correct lateral deviation. After the positioning fit is formed, the suction cups release the pressing plate. The second plate-removing assembly has the same structure as the first plate-removing assembly.

[0010] Preferably, the upper plate assembly includes a first linear drive module, a support arm, a first lifting module, and a first suction cup assembly. The first linear drive module is installed on the first body, the support arm is connected to the first linear drive module, the first lifting module is installed on the support arm, and the first suction cup assembly is connected to the first lifting module.

[0011] Preferably, the lower plate assembly includes a second linear drive module, a guide table, a second lifting module, a second suction cup assembly, and a first roller shaft. The second linear drive module is disposed on the second machine body, the second lifting module is connected to the second linear drive module, the second suction cup assembly is connected to the second lifting module, and the first roller shaft is rotatably disposed on the guide table.

[0012] Preferably, the conveying assembly includes two oppositely arranged guide rails, which are inclined downwards from the lower platen towards the upper platen, and rollers for rolling and supporting the fixture are provided on the opposite inner sides of the two guide rails.

[0013] Preferably, the unloading machine further includes a second body. The second bearing assembly includes two second vertical plates, two support rails, two transmission arms, a contact rod, a unloading plate, a second roller shaft, and two connecting assemblies. The two support rails are respectively disposed on the two second vertical plates, the two transmission arms are respectively rotatably connected to the two second vertical plates, the contact rod is connected between the two transmission arms, the unloading plate is located between the two second vertical plates, the second roller shaft is rotatably disposed on the upper surface of the unloading plate, and the lower surface of the unloading plate is provided with a first connecting rod and a second connecting rod. The connecting assembly includes a housing fixed to the second vertical plate and a rotating component rotatably connected to the housing. The rotating component is provided with a receiving notch for the first connecting rod to enter, and the second vertical plate is provided with a guide notch for the second connecting rod to move. The lower part of the guide notch is straight and the upper part is arc-shaped. The second body is provided with a trigger plate. When the second bearing assembly rises, the contact rod contacts the trigger plate and drives the transmission arm to rotate, so that the unloading plate first lifts the fixture and then rotates and tilts.

[0014] The present invention also provides a circuit board fixture, including a carrier plate and a pressing plate detachably disposed on the carrier plate. The carrier plate is embedded with a magnet for attracting the pressing plate, and the circuit board is located between the carrier plate and the pressing plate. The carrier plate and the pressing plate are respectively provided with corresponding positioning holes. The positioning holes are used for positioning pins for picking up the board assembly to pass through the pressing plate and insert into the carrier plate to determine the position of the pressing plate relative to the carrier plate.

[0015] The technical solution provided in this application has at least the following technical effects or advantages: The pressing plate is picked up and placed and the circuit board is loaded by the cooperation of the first bearing component, the first plate picking component and the upper plate component. The pressing plate is picked up and placed and the circuit board is unloaded by the cooperation of the second bearing component, the second plate picking component and the lower plate component. The jig bearing, pressing component picking and placing and circuit board transfer are connected in a defined process, reducing manual disassembly and handling, and improving the efficiency of continuous operation.

[0016] The positioning pin forms a mechanical positioning engagement with the positioning holes on the pressing plate and the carrier plate. The tapered lower end of the positioning pin can be inserted into the positioning hole of the carrier plate when the pressing plate descends and resets, and converts small lateral deviations into guide corrections, so that the chuck has determined the position of the pressing plate relative to the carrier plate before releasing the pressing plate. The magnet embedded in the carrier plate then attracts and holds the pressing plate, thereby reducing the possibility of pressing plate resetting misalignment and flexible circuit board being dragged, and improving positioning consistency during repeated pick-and-place operations.

[0017] The first load-bearing component and the first plate-removing component, as well as the second load-bearing component and the second plate-removing component, can be raised and lowered separately, so that the picking and placing of the pressing plate and the load-bearing action of the fixture are independent of each other; the upper plate component and the lower plate component complete the transfer of the flexible circuit board through a combination of linear movement and lifting movement, which can reduce the interference between the moving parts and facilitate the connection with the production cycle.

[0018] The conveying assembly limits the movement direction of the fixture by relatively set guide rails, and the fixture is carried by rollers on the inner side of the guide rails. This reduces the resistance to the movement of the fixture, so that the fixture that has completed the unloading of the circuit board can be conveyed from the lower board machine to the upper board machine, reducing the manual intervention in the fixture transfer process.

[0019] The trigger plate, contact rod, transmission arm, unloading plate, connecting component and guide notch work together to convert the rising stroke of the second bearing component into a phased action of the unloading plate first lifting linearly and then rotating and tilting, so that the fixture is first separated from the support guide rail and then released; the paired transmission arm and support guide rail also help to improve the repeatability stability of the fixture lifting, tilting unloading and resetting process.

[0020] The above description of the invention is used to summarize the technical solution of the present invention and is not intended to limit the scope of protection of the present invention; the specific scope of protection of the present invention shall be determined by the claims. Attached Figure Description

[0021] The structure, connection relationships, operation process, and technical effects of the various embodiments of the present invention will become clearer upon referring to the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar structures, wherein: Figure 1 This is a schematic diagram of the overall structure of the automatic circuit board loading and unloading machine system of the present invention; Figure 2 This is a schematic diagram of the structure of the loading machine and the conveying assembly of the present invention; Figure 3 This is a schematic diagram of the internal structure of the upper plate machine of the present invention; Figure 4 This is a schematic diagram of the structure of the upper plate machine after part of the machine body has been removed; Figure 5 This is a schematic diagram of the upper plate assembly of the present invention; Figure 6 This is a schematic diagram of the assembly structure of the first bearing component and the first plate-removing component of the present invention; Figure 7 This is an exploded structural diagram of the first bearing component and the first plate-removing component of the present invention; Figure 8 This is a schematic diagram of the lower plate mechanism of the present invention; Figure 9 This is a front view structural diagram of the lower plate mechanism of the present invention; Figure 10 This is a schematic diagram of the structure of the lower plate machine after removing part of the machine body; Figure 11 This is a schematic diagram of the assembly structure of the internal components of the lower circuit board of the present invention; Figure 12 This is an exploded structural diagram of the internal components of the lower circuit board of the present invention; Figure 13 This is a first-view structural schematic diagram of the lower plate assembly of the present invention; Figure 14 This is a second-view structural schematic diagram of the lower plate assembly of the present invention; Figure 15 This is a schematic diagram of the assembly structure of the lower plate assembly, the second bearing assembly, and the second plate removal assembly of the present invention; Figure 16 This is a schematic diagram of the second bearing component in the inclined unloading state in Embodiment 2 of the present invention; Figure 17 This is a schematic diagram of the bottom structure of the second supporting component in Embodiment 2 of the present invention; Figure 18 This is an exploded structural diagram of the connecting component of the present invention; Figure 19 This is an exploded structural diagram of the second bearing component and fixture in Embodiment 2 of the present invention; Figure 20 This is a schematic diagram of the structure of the fixture of the present invention.

[0022] Explanation of reference numerals in the attached figures 100-Loading machine, 110-First machine body, 120-First double belt module, 130-First load-bearing component, 131-First upright plate, 132-First load-bearing guide rail, 140-First plate-removing component, 141-Connecting seat, 142-Mounting plate, 143-Suction cup, 144-Positioning pin, 150-Loading component, 151-First linear drive module, 152-Load-bearing support arm, 153-First lifting module, 154-First suction cup component; 200-Unloading machine, 210-Second body, 211-Trigger plate, 220-Second double belt module, 230-Second bearing assembly, 231-Second upright plate, 2311-Guide notch, 232-Support guide rail, 233-Transmission arm, 234-Contact rod, 235-Unloading plate, 2351-First connecting rod, 2352-Second connecting rod, 236-Second roller, 237-Connecting assembly, 2371-Housing, 2372-Rotating component, 23721-Protrusion, 2373-Tension spring, 2374-Limiting part, 240-Second plate picking assembly, 250-Unloading assembly, 251-Second linear drive module, 252-Guide table, 253-Second lifting module, 254-Second suction cup assembly, 255-First roller; 300 - Conveyor assembly; 310 - Guide rail; 400- Fixture, 410- Bearing plate, 420- Pressing plate. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0025] The term "first height" as used in this document refers to the working height that facilitates the placement and loading of the upper plate assembly 150 or lower plate assembly 250 with the fixture 400; "second height" refers to the release height at which the second bearing assembly 230 continues to rise and connects the empty fixture 400 with the conveying assembly 300. All of the above heights are relative to the corresponding machine body and execution components, and are not limited to a fixed value.

[0026] Example 1 like Figures 1 to 2 As shown, the automatic board loading and unloading machine system of this embodiment includes a board loading machine 100, a board unloading machine 200, and a conveying assembly 300. The loading machine 100 is used to load the flexible circuit board to be processed into the fixture 400. After the flexible circuit board is processed, it is removed from the fixture 400 by the unloading machine 200. The conveying assembly 300 is set between the loading machine 100 and the unloading machine 200 and is used to send the empty fixture 400 after unloading back to the loading machine 100 to load the next flexible circuit board.

[0027] The loading machine 100 and unloading machine 200 are located on the processing path of the flexible circuit board, and the conveying assembly 300 forms a fixture return path that is different from the processing path. The flexible circuit board enters the processing station from the loading machine 100 along with the fixture 400, and separates from the fixture 400 at the unloading machine 200; the empty fixture 400 is then returned to the loading machine 100 via the conveying assembly 300, thereby avoiding the need to pile up the unloaded fixtures 400 and then manually put them back in.

[0028] The loading machine 100 includes a first body 110, a first double belt module 120, a first bearing component 130, a first plate picking component 140, and a loading component 150; The first double belt module 120 is disposed on the first body 110. The first bearing component 130 and the first plate taking component 140 are both installed on the first double belt module 120. The first double belt module 120 is used to control the first bearing component 130 and the first plate taking component 140 to perform lifting and lowering movements respectively.

[0029] Specifically, the first dual-belt module 120 includes two sets of belt drive mechanisms arranged vertically and independent of each other. Each set of belt drive mechanisms includes a driving wheel, a driven wheel, a drive belt wound between the driving wheel and the driven wheel, and a drive source for driving the driving wheel to rotate. The drive belt of one set of belt drive mechanisms is connected to the first bearing assembly 130, and the drive belt of the other set of belt drive mechanisms is connected to the first plate-taking assembly 140. The two sets of belt drive mechanisms are driven by their respective drive sources, so that the first bearing assembly 130 and the first plate-taking assembly 140 can move up and down independently of each other.

[0030] The first dual-belt module 120 provides vertical movement to the first bearing assembly 130 and the first plate-removing assembly 140, respectively, so that the first bearing assembly 130 is used to determine the working height of the fixture 400, and the first plate-removing assembly 140 is used to change the height of the pressing plate 420. By changing the relative distance between the two, the pressing plate 420 can be removed and repositioned without removing the bearing plate 410.

[0031] The upper plate assembly 150 is disposed on the first body 110 and is used to load the flexible circuit board onto the first support assembly 130 to realize the loading operation.

[0032] The upper plate assembly 150 has a linear transfer action in the horizontal direction and a lifting and placing action in the vertical direction. It can first lift the flexible circuit board away from the feeding position, then transfer it laterally to the top of the carrier plate 410 and lower it for release. This action sequence can reduce the interference between the flexible circuit board and the first machine body 110 or the first carrier assembly 130 during the transfer process.

[0033] Furthermore, the fixture 400 includes a support plate 410 and a pressing plate 420, wherein the support plate 410 is embedded with a magnet for adsorbing the pressing plate 420.

[0034] The support plate 410, made of aluminum, balances the structural rigidity and overall weight of the fixture 400. The pressing plate 420 responds to the attraction of the magnet inside the support plate 410. The magnetic attraction allows the pressing plate 420 to remain pressed without mechanical fasteners penetrating the flexible circuit board, facilitating repeated assembly and disassembly of the pressing plate 420 by the first board removal assembly 140 and the second board removal assembly 240, while reducing the impact of fastener assembly and disassembly on the production cycle.

[0035] The support plate 410 and the pressing plate 420 are respectively provided with corresponding positioning holes, with the pressing plate 420 located above the support plate 410. The positions of the positioning holes correspond to the positioning pins 144. When the suction cup 143 picks up the pressing plate 420, the positioning pins 144 pass through the positioning holes of the pressing plate 420. After the first plate-removing assembly 140 carries the pressing plate 420 down, the lower end of the positioning pins 144 is provided with a guide portion. The cross-sectional area of ​​the guide portion gradually increases from bottom to top. In this embodiment, the guide portion of the positioning pins 144 has a conical structure, and the conical lower end of the positioning pins 144 continues to be inserted into the positioning holes of the support plate 410. The conical lower end generates a guiding effect during the process of entering the positioning holes of the support plate 410, gradually correcting the small lateral deviation between the pressing plate 420 and the support plate 410. When the positioning pins 144 simultaneously engage with the positioning holes of the two plates, a mechanical positioning reference for the pressing plate 420 relative to the support plate 410 is established.

[0036] During use, the empty fixture 400 returns to the first support assembly 130. The first dual-belt module 120 first drives the first plate-retrieving assembly 140 to descend, causing the positioning pin 144 to enter the corresponding positioning hole and the suction cup 143 to adsorb the pressing plate 420. Then, it drives the first plate-retrieving assembly 140 to rise to remove the pressing plate 420. The first dual-belt module 120 then controls the first support assembly 130 to move to the first height, and the upper plate assembly 150 picks up the flexible circuit board to be processed and places it on the support plate 410. After that, the first dual-belt module 120 drives the first plate-retrieving assembly 140 to descend carrying the pressing plate 420. At this time, the positioning pin 144 has passed through the positioning hole of the pressing plate 420, and its tapered lower end continues to be inserted into the positioning hole of the support plate 410 to guide and correct the lateral position of the pressing plate 420. With the positioning pin 144 maintaining the positioning engagement, the suction cup 143 releases the pressing plate 420, and the magnet inside the carrier plate 410 immediately attracts and holds the pressing plate 420, thereby pressing the flexible circuit board between the two. After the pressing and positioning are completed, the fixture 400 is sent to the processing station for sequential processing such as printing, surface mounting, translation, and reflow soldering, and finally enters the unloading machine 200 for unloading.

[0037] After pressing, the fixture 400 carries the flexible circuit board into the processing station in sequence. The processing station in this embodiment includes, but is not limited to, a printer, a pick-and-place machine, a translation machine, and a reflow soldering workstation; different processing equipment can be transferred using a conveyor structure adapted to the fixture 400, and finally the fixture 400 enters the unloading machine 200 for unloading operation.

[0038] The first support assembly 130 includes two first upright plates 131, which are connected to each other and form a support space for the fixture 400 between them. One of the first upright plates 131 is connected to the first double belt module 120. First support guide rails 132 are fixedly provided on opposite sides of the two first upright plates 131, and the two first support guide rails 132 are used to support the fixture 400.

[0039] Two first bearing guide rails 132 are arranged opposite to each other and together form the support surface of the fixture 400, keeping the middle area of ​​the fixture 400 open, facilitating the first plate-removing assembly 140 to approach the pressing plate 420 from above, and facilitating the lifting and lowering of the first bearing assembly 130. Two first upright plates 131 are connected to each other, so that the two first bearing guide rails 132 maintain a stable relative position when bearing the fixture 400.

[0040] The first plate-removing assembly 140 includes a connecting seat 141, a mounting plate 142, suction cups 143, and a positioning pin 144. The connecting seat 141 is connected to the first double-belt module 120, and the mounting plate 142 is fixedly connected to the connecting seat 141. Multiple suction cups 143 are spaced apart on the lower surface of the mounting plate 142 to form a distributed adsorption of the pressing plate 420. The positioning pin 144 is located on the lower surface of the mounting plate 142, and its lower end has a tapered structure. Both the bearing plate 410 and the pressing plate 420 have positioning holes that cooperate with the positioning pin 144. The suction cups 143 are used to hold and transfer the pressing plate 420 vertically, and the cooperation between the positioning pin 144 and the positioning holes is used to determine the lateral position of the pressing plate 420 when it is being sucked up or released. The two work together to complete the picking up, placing, and positioning of the pressing plate 420.

[0041] When removing the pressing plate 420, the first plate-removing assembly 140 descends first, allowing the positioning pin 144 to enter the positioning holes of the pressing plate 420 and the support plate 410. Then, the suction cup 143 contacts and adsorbs the pressing plate 420. After adsorption is established, the first plate-removing assembly 140 rises, the positioning pin 144 exits the positioning hole of the support plate 410, and carries the pressing plate 420 away, while the positioning pin 144 remains inserted through the positioning hole of the pressing plate 420. When resetting the pressing plate 420, the first plate-removing assembly 140 descends carrying the pressing plate 420, and the tapered lower end of the positioning pin 144 enters the positioning hole of the support plate 410 to correct the lateral deviation of the pressing plate 420. While the positioning pin 144 remains inserted, the suction cup 143 releases the adsorption, allowing the magnet to continue holding the pressing plate 420. Therefore, the release action of the suction cup 143 occurs after the mechanical positioning is established, which can reduce the possibility of the pressing plate 420 moving laterally due to magnetic attraction at the moment of release.

[0042] The upper plate assembly 150 includes a first linear drive module 151, a support arm 152, a first lifting module 153, and a first suction cup assembly 154. The first linear drive module 151 is installed inside the first body 110. The support arm 152 is connected to the first linear drive module 151. The first lifting module 153 is installed on the support arm 152. The first suction cup assembly 154 is connected to the output end of the first lifting module 153. When the support plate 410 is at a first height, the first lifting module 153 drives the first suction cup assembly 154 to descend. The first suction cup assembly 154 then adsorbs the flexible circuit board and rises. The first linear drive module 151 then drives the support arm 152, the first lifting module 153, the first suction cup assembly 154, and the adsorbed flexible circuit board to move linearly together above the support plate 410. Subsequently, the first lifting module 153 drives the first suction cup assembly 154 to descend, and the first suction cup assembly 154 places the flexible circuit board on the carrier plate 410 and releases the suction, thereby completing the loading action of the flexible circuit board.

[0043] When the carrier plate 410 is at the first height, the first lifting module 153 drives the first suction cup assembly 154 to move downwards. The first suction cup assembly 154 then adsorbs the flexible circuit board to be processed and moves upwards. The first linear drive module 151 then drives the carrier arm 152, the first lifting module 153, the first suction cup assembly 154, and the adsorbed flexible circuit board to move linearly together, so that the flexible circuit board reaches above the carrier plate 410. Subsequently, the first lifting module 153 drives the first suction cup assembly 154 to descend to the placement position. The first suction cup assembly 154 releases the adsorption and releases the flexible circuit board, thereby completing the loading action of the flexible circuit board.

[0044] The first linear drive module 151 is responsible for lateral transfer between the material picking position and above the fixture 400, and the first lifting module 153 is responsible for vertical adjustment between the adsorption height and the release height. The two directions of movement are divided, so that the first suction cup assembly 154 can leave the material picking surface first and then move horizontally, and then descend to release the plate after reaching above the support plate 410, thereby reducing the possibility of the flexible circuit board scratching the surrounding structure during the transfer process.

[0045] The unloading machine 200 includes a second body 210, a second double belt module 220, a second bearing component 230, a second plate picking component 240, and an unloading component 250.

[0046] The second support assembly 230, the second plate-removing assembly 240, and the lower plate assembly 250 are arranged around the same fixture operating position: the second support assembly 230 supports the fixture 400 from below, the second plate-removing assembly 240 approaches the pressing plate 420 from above, and the lower plate assembly 250 approaches the flexible circuit board after the pressing plate 420 is removed. This spatial relationship allows the plate removal, plate picking, and fixture release to be completed sequentially within the lower plate machine 200.

[0047] The second double belt module 220 is disposed inside the second body 210. The second bearing component 230 and the second plate taking component 240 are both installed on the second double belt module 220. The second double belt module 220 is used to control the second bearing component 230 and the second plate taking component 240 to perform lifting and lowering movements respectively.

[0048] The second double belt module 220 controls the lifting and lowering of the second bearing component 230 and the second plate taking component 240 respectively. The second plate taking component 240 can first contact the pressing plate 420 and take the plate, then the second bearing component 230 can reach the material taking height of the lower plate component 250, and finally the second bearing component 230 can continue to rise to the jig release height, so that different actions share the vertical arrangement space.

[0049] The lower plate assembly 250 is disposed on the second body 210 and is used to remove the flexible circuit board from the carrier plate 410 to realize the lower plate operation.

[0050] When removing the board, the unloading assembly 250 only picks up the flexible circuit board that has been released from pressure. The pressing plate 420 is held separately by the second board removal assembly 240, while the carrier plate 410 continues to be supported by the second carrier assembly 230. This separates the disassembly and assembly of the pressing plate 420 from the transfer of the flexible circuit board, reducing mutual interference between the two during the unloading process.

[0051] When the fixture 400 carrying the flexible circuit board arrives at the unloading machine 200, the fixture 400 is supported by the second support assembly 230. The second board-removing assembly 240 first engages with the positioning hole on the fixture 400 through its positioning pin, and then uses a suction cup to pick up the pressing plate 420 and carry the pressing plate 420 upward to release the pressure of the pressing plate 420 on the flexible circuit board. The unloading assembly 250 then removes the flexible circuit board from the support plate 410, completing the unloading operation. After the flexible circuit board is removed, the second double belt module 220 drives the second support assembly 230 to rise, or drives the second board-removing assembly 240 to fall, or performs both actions simultaneously, so that the pressing plate 420 approaches the support plate 410 again. The positioning pin of the second board-removing assembly 240 first guides and positions the pressing plate 420 and the support plate 410, and then the suction cup releases the pressing plate 420, so that the pressing plate 420 is reset to the predetermined position. Subsequently, the second double belt module 220 drives the second bearing assembly 230 to move to the second height and releases the empty fixture 400, which is then returned to the upper plate machine 100 by the conveying assembly 300.

[0052] After the pressing plate 420 is placed back onto the support plate 410, the empty fixture 400 returns to its assembled state, ready for overall reflow. The second support assembly 230 then lifts or guides the empty fixture 400 to a position where it connects with the conveying assembly 300, so that when the empty fixture 400 leaves the lower plate machine 200, the support plate 410 and the pressing plate 420 remain held together by magnetic attraction, reducing relative movement between the two plates during the reflow process.

[0053] The conveying assembly 300 includes at least a guide rail 310 and a conveyor belt mechanism for conveying the fixture 400.

[0054] In this embodiment, the conveying component 300 provides active conveying force to the fixture 400 by means of a conveyor belt mechanism. The conveyor belt mechanism drives the empty fixture 400 after it has been unloaded to return from the unloading machine 200 to the loading machine 100. The guide rail 310 is used to support the fixture 400, limit the moving direction of the fixture 400, and dock with the first supporting component 130 of the loading machine 100.

[0055] The second plate-removing assembly 240 has the same structure as the first plate-removing assembly 140, and the second bearing assembly 230 has the same structure as the first bearing assembly 130; their specific connection relationship and operation mode can be referred to the relevant descriptions of the first plate-removing assembly 140 and the first bearing assembly 130.

[0056] The second plate-removing assembly 240 uses the same connecting seat, mounting plate, suction cup, and positioning pin structure as the first plate-removing assembly 140. When the second plate-removing assembly 240 picks up or resets the pressing plate 420, the positioning pin first engages with the positioning holes on the pressing plate 420 and the support plate 410, and then the suction cup establishes or releases its suction. Therefore, both ends of the upper and lower plates can complete the picking and placing of the pressing plate 420 with the same mechanical reference. The second support assembly 230 in Embodiment 1 uses the same double-plate and double-support guide rail structure as the first support assembly 130, and thus can support the fixture 400 with the same two-sided support method.

[0057] The lower plate assembly 250 includes a second linear drive module 251, a guide table 252, a second lifting module 253, a second suction cup assembly 254, and a first roller 255; The second linear drive module 251 establishes a lateral transfer stroke between the fixture 400 and the guide table 252, the second lifting module 253 establishes a vertical stroke between the pick-up height and the safe transfer height of the flexible circuit board, and the first roller 255 forms a rolling support surface after the flexible circuit board is released. This structure allows the flexible circuit board to detach from the fixture 400 before being transferred and exported.

[0058] The second linear drive module 251 is disposed within the second body 210. The second lifting module 253 is connected to the second linear drive module 251, and the second suction cup assembly 254 is connected to the second lifting module 253. When the fixture 400 is supported on the second bearing assembly 230 and is at the first height, the second linear drive module 251 first drives the second lifting module 253 and the second suction cup assembly 254 to move above the fixture 400. The second lifting module 253 then drives the second suction cup assembly 254 to descend and pick up the flexible circuit board. Subsequently, the second lifting module 253 drives the second suction cup assembly 254 to rise, and the second linear drive module 251 drives the second lifting module 253, the second suction cup assembly 254, and the adsorbed flexible circuit board to move linearly together to above the guide table 252. The first roller shaft 255 is rotatably disposed on the guide table 252, and the second suction cup assembly 254 descends and releases the adsorption, allowing the flexible circuit board to fall onto the supporting surface formed by the first roller shaft 255, thereby completing the unloading and guiding.

[0059] During the above process, the second lifting module 253 keeps the second suction cup assembly 254 in an approximately vertical position during suction and release, and the second linear drive module 251 moves the adsorbed flexible circuit board toward the guide table 252 after it leaves the fixture 400. The first roller 255 can roll and support the flexible circuit board after it is released, reducing friction and dragging of the flexible circuit board relative to the guide table 252, which helps maintain the flatness of the circuit board.

[0060] When the system completes one cycle, the fixture 400 sequentially undergoes the following processes: empty fixture positioning, removal of the pressing plate 420 after positioning, placement of the flexible circuit board, guiding and repositioning of the pressing plate 420, insertion of the fixture 400 into the processing station, repositioning and removal of the pressing plate 420, unloading of the flexible circuit board, guiding and repositioning of the pressing plate 420 again, and return of the empty fixture 400. Both repositionings of the pressing plate 420 occur after the positioning pin and positioning hole have engaged before the suction cup is released, ensuring that the pressing plate 420 returns to the support plate 410 with the same positioning reference in different stations and multiple cycles. Each action is based on the stable support of the fixture 400 on the corresponding support component. The timing of action switching can be determined by the stroke position, the arrival signal, or existing equipment control logic to ensure that the next action is executed only after the previous action is completed.

[0061] Example 2 Compared with Embodiment 1, the difference in this embodiment is that the second bearing component 230 includes two second upright plates 231, two support guide rails 232, two transmission arms 233, a contact rod 234, a feeding plate 235, a second roller shaft 236, and two connecting components 237. This embodiment retains the structure and working process of the upper plate machine 100, the second plate picking assembly 240, the lower plate assembly 250, and the fixture 400 in Embodiment 1; the difference is that this embodiment further limits the material unloading linkage structure of the second bearing assembly 230, so that in addition to bearing and lifting the fixture 400, the second bearing assembly 230 can automatically change the posture of the fixture 400 when it reaches the second height and send it into the conveying assembly 300, and the conveying assembly 300 uses rollers to bear the fixture 400 and uses gravity to achieve return.

[0062] Two second vertical plates 231 are connected to each other, and one of the second vertical plates 231 is connected to the second double belt module 220. Two support guide rails 232 are respectively set on the two second vertical plates 231. Two transmission arms 233 are respectively rotatably installed on the two second vertical plates 231. A contact rod 234 is installed between the two transmission arms 233. The lower surface of the unloading plate 235 is provided with a first connecting rod 2351 and a second connecting rod 2352. A second roller shaft 236 is rotatably installed on the upper surface of the unloading plate 235. The two support guide rails 232 are used to support the fixture 400. The unloading plate 235 is located between the two second vertical plates 231, and the second roller shaft 236 is lower than the contact surface between the two support guide rails 232 and the fixture 400.

[0063] The ends of the two transmission arms 233 away from the contact rod 234 directly abut against the lower surface of the feed plate 235. The transmission arms 233 and the feed plate 235 are not fixedly connected. When the transmission arms 233 rotate, they push the feed plate 235 upward through the contact position. After the push is released, the feed plate 235 can fall back relative to the transmission arms 233.

[0064] In the initial loading state, the second roller 236 is lower than the contact plane between the two support guide rails 232 and the fixture 400. Therefore, the fixture 400 is supported by the two support guide rails 232, and the second roller 236 does not lift the fixture 400. This height relationship ensures that the second load-bearing assembly 230 maintains stable load-bearing when receiving the fixture 400, the second plate-removing assembly 240 removes the pressing plate 420, and the unloading assembly 250 removes the flexible circuit board, preventing the unloading structure from prematurely changing the posture of the fixture 400.

[0065] The connecting assembly 237 includes a housing 2371, a rotating member 2372, and a tension spring 2373. The housing 2371 is fixedly mounted on the second upright plate 231. The housing 2371 has a receiving space for accommodating the rotating member 2372. The rotating member 2372 is rotatably connected to the housing 2371 within the receiving space and has a receiving notch for the first connecting rod 2351 to enter. The housing 2371 has a sliding groove, and the rotating member 2372 has a protrusion 23721. One end of the tension spring 2373 is connected to the protrusion 23721, and the other end is connected to the housing 2371. The tension spring 2373 applies an elastic force to the rotating member 2372 toward its initial position, causing the protrusion 23721 to contact one end of the sliding groove and causing the receiving notch of the rotating member 2372 to face downwards, so that the first connecting rod 2351 rises with the feed plate 235 and enters the receiving notch.

[0066] In its initial state, the tension spring 2373 keeps the rotating member 2372 in the position with the receiving notch facing downwards. The first connecting rod 2351 can rise with the feed plate 235 and enter the receiving notch. When the rotating member 2372 rotates, the protrusion 23721 moves along the slide groove and stretches the tension spring 2373, thereby storing elastic potential energy for subsequent reset. The slide groove also limits the range of motion of the protrusion 23721 to prevent the rotating member 2372 from rotating without constraint.

[0067] The first connecting rod 2351 and the second connecting rod 2352 both have rectangular cross-sections. The housing 2371 has a guide portion that slides with the first connecting rod 2351. The rectangular cross-section of the first connecting rod 2351 engages with the guide portion to restrict the first connecting rod 2351 from moving linearly up and down in the initial stage of operation. A limiting portion 2374 is provided at the bottom of the housing 2371 to prevent the first connecting rod 2351 from dislodging downwards from the guide portion. Both second vertical plates 231 have guide notches 2311. The lower part of the guide notch 2311 is linear, used to guide the second connecting rod 2352 to move linearly up and down; the upper part of the guide notch 2311 is arc-shaped, used to allow the second connecting rod 2352 to rotate with the feed plate 235.

[0068] The rectangular fit between the first connecting rod 2351 and the guide part, and the fit between the second connecting rod 2352 and the straight lower part of the guide notch 2311, together restrict the material plate 235 from rotating in the initial stage of operation. Only when the second connecting rod 2352 rises to the arc-shaped upper part of the guide notch 2311 and the first connecting rod 2351 enters the receiving notch of the rotating part 2372, can the material plate 235 rotate. This establishes a mechanical sequence of first lifting and then tilting.

[0069] The second body 210 is equipped with a trigger plate 211. When the second double belt module 220 drives the second bearing assembly 230 to rise and approach the second height, the contact rod 234 contacts the trigger plate 211. As the second bearing assembly 230 continues to rise, the trigger plate 211 fixed to the second body 210 drives the two transmission arms 233 to rotate synchronously relative to the second vertical plate 231 through the contact rod 234. The ends of the two transmission arms 233 away from the contact rod 234 push the unloading plate 235 upward, causing the unloading plate 235 to drive the first connecting rod 2351 and the second connecting rod 2352 to rise. In the initial stage of operation, under the combined constraint of the guide part of the housing 2371 and the straight lower part of the guide notch 2311, the unloading plate 235 only moves in the vertical direction; the second roller 236 rises with the unloading plate 235 and contacts the lower side of the fixture 400, pushing the fixture 400 away from the support guide rail 232. Simultaneously, the first connecting rod 2351 enters the receiving notch of the rotating member 2372, and the second connecting rod 2352 moves to the upper arc-shaped part of the guide notch 2311. Subsequently, as the second bearing assembly 230 continues to rise, the contact rod 234 continues to contact the trigger plate 211, and the transmission arm 233 continues to push the unloading plate 235, causing the unloading plate 235 to gradually tilt around the rotation axis of the rotating member 2372 as the rotation center; the rotating member 2372 rotates accordingly and stretches the tension spring 2373, while the fixture 400 rolls along the second roller shaft 236 to the conveying assembly 300 under the action of gravity.

[0070] In the initial stage of operation, the unloading plate 235 moves only in the vertical direction under the combined constraints of the guide portion of the first connecting rod 2351 and the housing 2371, and the straight lower portion of the second connecting rod 2352 and the guide notch 2311. As the transmission arm 233 continues to lift the unloading plate 235, the second roller 236 contacts the lower side of the fixture 400 and pushes the fixture 400 away from the support guide rail 232; at the same time, the first connecting rod 2351 enters the receiving notch of the rotating part 2372, and the second connecting rod 2352 moves to the arc-shaped upper portion of the guide notch 2311.

[0071] As the second supporting component 230 continues to rise, the contact rod 234 continues to contact the trigger plate 211, and the transmission arm 233 further pushes the unloading plate 235. Since the second connecting rod 2352 has entered the arc-shaped upper part of the guide notch 2311, and the first connecting rod 2351 has cooperated with the receiving notch of the rotating component 2372, the unloading plate 235 transitions from the linear lifting stage to the rotation tilting stage, and gradually tilts with the rotation axis of the rotating component 2372 as the rotation center. When the rotating component 2372 rotates, it drives the protrusion 23721 to move along the slide groove of the housing 2371 and stretch the tension spring 2373; the fixture 400 rolls along the second roller shaft 236 under the action of gravity and slides toward the conveying component 300.

[0072] The aforementioned guiding relationship establishes a clear sequence of actions: first, the jig 400 is lifted off the support guide rail 232, and then the unloading plate 235 is tilted. This avoids jamming caused by the jig 400 tilting directly while still constrained by the support guide rail 232; the two transmission arms 233 move synchronously under the connection of the contact rod 234, and provide pushing force from both sides of the unloading plate 235, which can reduce the tilting caused by uneven force on the left and right sides of the unloading plate 235.

[0073] After the jig 400 leaves the unloading plate 235, the second double belt module 220 drives the second bearing assembly 230 to descend, and the contact rod 234 gradually disengages from the trigger plate 211, releasing the triggering action on the transmission arm 233. The tension spring 2373 releases its elastic potential energy and drives the rotating component 2372 to rotate, causing the protrusion 23721 to approach the initial end of the chute again. Under the reset action of the tension spring 2373 and its own gravity, the unloading plate 235 returns from an inclined state to a horizontal state and falls back with the transmission arm 233. The second connecting rod 2352 returns from the arc-shaped upper part of the guide notch 2311 to the straight lower part, the first connecting rod 2351 exits the receiving notch of the rotating component 2372, and the second roller 236 returns to below the bearing plane of the support guide rail 232 to receive the next jig 400.

[0074] During the reset process, the accommodating space of the housing 2371 provides rotational clearance space for the rotating component 2372 and the first connecting rod 2351 entering the accommodating notch of the rotating component 2372, and the arc-shaped upper part of the guide notch 2311 on the second upright plate 231 provides rotational clearance space for the second connecting rod 2352; as the unloading plate 235 falls back, the first connecting rod 2351 and the second connecting rod 2352 return to their corresponding straight guide positions, thereby preventing the unloading plate 235 from getting stuck with the housing 2371 or the second upright plate 231 during reset.

[0075] The limiting part 2374 restricts the downward disengagement of the first connecting rod 2351, the two ends of the slide groove limit the range of motion of the protrusion 23721, and the tension spring 2373 keeps the rotating part 2372 tending to return to its initial position; these structures together improve the positional certainty of the connecting assembly 237 during repeated actions. The lifting and tilting of the unloading plate 235 are both triggered by the lifting stroke of the second bearing assembly 230, eliminating the need for a separate active drive component dedicated to tilting the unloading plate 235, which simplifies the unloading linkage.

[0076] Furthermore, the two guide rails 310 of the conveying assembly 300 are arranged opposite each other, and rollers are respectively provided on their inner sides. The guide rails 310 are inclined downwards from the lower platen machine 200 toward the upper platen machine 100. The empty fixture 400 is carried by the rollers under the action of gravity and flows back along the guide rails 310 to the first carrying assembly 130 of the upper platen machine 100 to enter the next upper platen cycle. Thus, the fixture 400 can be circulated between the upper platen machine 100, the processing station and the lower platen machine 200, reducing the manual handling required for the return of the empty fixture 400.

[0077] In this embodiment, the conveying assembly 300 does not have a conveyor belt mechanism. Instead, the empty fixture 400 is carried by the guide rail 310 and the rollers on its inner side, which are arranged opposite to each other. The empty fixture 400 is allowed to flow back along the rollers under the action of gravity by utilizing the height difference formed by the guide rail 310 tilting downward from the lower platen 200 toward the upper platen 100.

[0078] In this embodiment, the triggering timing of the unloading action is determined by the contact position between the trigger plate 211 and the contact rod 234. The movement sequence and reset state of the unloading plate 235 are determined by the linear guide section, the arc guide section, the rotating component 2372, and the tension spring 2373, so that the lifting, tilting, releasing, and resetting actions can be completed continuously with the lifting and lowering of the second bearing component 230. This linkage structure retains the conventional bearing function of the second bearing component 230 on the fixture 400, and also allows the empty fixture 400 to reliably enter the return path after the unloading is completed.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Modifications, equivalent substitutions, or improvements made by those skilled in the art without departing from the concept of the present invention should all fall within the scope of protection of the present invention; the scope of protection of the present invention is determined by the claims.

Claims

1. An automatic circuit board loading and unloading machine system, characterized in that, The device includes an upper plate feeder (100), a lower plate feeder (200), a conveying assembly (300) disposed between the upper plate feeder (100) and the lower plate feeder (200), and a fixture (400); the fixture (400) includes a support plate (410) and a pressing plate (420) detachably disposed on the support plate (410); the upper plate feeder (100) includes a first plate taking assembly (140); The first plate-removing assembly (140) is provided with a suction cup (143) for picking up or releasing the pressing plate (420) and a positioning pin (144); the support plate (410) and the pressing plate (420) are respectively provided with positioning holes that correspond to each other and cooperate with the positioning pin (144); the lower end of the positioning pin (144) is provided with a guide portion, the cross-section of the guide portion gradually increases from bottom to top, and can pass through the positioning hole of the pressing plate (420) and insert into the positioning hole of the support plate (410) while the suction cup (143) picks up the pressing plate (420).

2. The automatic circuit board loading and unloading system according to claim 1, characterized in that, The carrier plate (410) is embedded with a magnet for attracting and holding the pressing plate (420) after the positioning pin (144) has been positioned. The circuit board is located between the carrier plate (410) and the pressing plate (420).

3. The automatic circuit board loading and unloading system according to claim 1, characterized in that, The upper plate machine (100) further includes a first body (110), a first double belt module (120), a first bearing component (130), and an upper plate component (150) disposed on the first body (110). The first bearing component (130) and the first plate-removing component (140) are respectively connected to the first double belt module (120) and can be raised and lowered respectively. The upper plate component (150) is disposed on the first body (110). The lower plate machine (200) includes a second body (210), a second double belt module (220), a second bearing component (230), a second plate-removing component (240), and a lower plate component (250) disposed on the second body (210). The second bearing component (230) and the second plate-removing component (240) are respectively connected to the second double belt module (220) and can be raised and lowered respectively. The lower plate component (250) is disposed on the second body (210).

4. The automatic circuit board loading and unloading system according to claim 3, characterized in that, The first support component (130) includes two first upright plates (131) that are connected to each other and spaced apart. One of the first upright plates (131) is connected to the first double belt module (120). The two first upright plates (131) are respectively provided with first support guide rails (132) on their opposite inner sides. The two first support guide rails (132) together form the support space of the fixture (400).

5. The automatic circuit board loading and unloading system according to claim 3, characterized in that, The first plate-removing assembly (140) further includes a connecting seat (141) and a mounting plate (142). The connecting seat (141) is connected to the first double belt module (120), and the mounting plate (142) is fixedly connected to the connecting seat (141). The suction cup (143) and the positioning pin (144) are both disposed on the lower surface of the mounting plate (142). There are multiple suction cups (143) and they are spaced apart. The second plate-removing assembly (240) has the same structure as the first plate-removing assembly (140).

6. The automatic circuit board loading and unloading system according to claim 3, characterized in that, The upper plate assembly (150) includes a first linear drive module (151), a support arm (152), a first lifting module (153), and a first suction cup assembly (154). The first linear drive module (151) is installed on the first body (110). The support arm (152) is connected to the first linear drive module (151). The first lifting module (153) is installed on the support arm (152). The first suction cup assembly (154) is connected to the first lifting module (153).

7. The automatic circuit board loading and unloading system according to claim 3, characterized in that, The lower plate assembly (250) includes a second linear drive module (251), a guide table (252), a second lifting module (253), a second suction cup assembly (254), and a first roller (255). The second linear drive module (251) is disposed on the second body (210). The second lifting module (253) is connected to the second linear drive module (251). The second suction cup assembly (254) is connected to the second lifting module (253). The first roller (255) is rotatably disposed on the guide table (252).

8. The automatic circuit board loading and unloading system according to claim 1, characterized in that, The conveying assembly (300) includes two oppositely arranged guide rails (310), which are inclined downwards from the lower platen machine (200) toward the upper platen machine (100), and rollers for rolling the jig (400) are provided on the opposite inner sides of the two guide rails (310).

9. The automatic circuit board loading and unloading system according to claim 1, characterized in that, The unloading machine (200) includes a second body (210) and a second bearing assembly (230). The second bearing assembly (230) includes two second vertical plates (231), two support guide rails (232), two transmission arms (233), a contact rod (234), a unloading plate (235), a second roller shaft (236), and two connecting assemblies (237). The two support guide rails are respectively disposed on the two second vertical plates, the two transmission arms are respectively rotatably connected to the two second vertical plates, the contact rod is connected between the two transmission arms, the unloading plate is located between the two second vertical plates, and the second roller shaft is rotatably disposed on the upper surface of the unloading plate. The lower surface of the plate is provided with a first connecting rod (2351) and a second connecting rod (2352); the connecting assembly includes a housing (2371) fixed to the second upright plate and a rotating component (2372) rotatably connected to the housing. The rotating component is provided with a receiving notch for the first connecting rod to enter. The second upright plate is provided with a guide notch (2311) for the second connecting rod to move. The lower part of the guide notch is straight and the upper part is arc-shaped. The second machine body is provided with a trigger plate (211). When the second bearing assembly rises, the contact rod contacts the trigger plate and drives the transmission arm to rotate, so that the unloading plate first lifts the fixture (400) and then rotates and tilts.

10. The automatic circuit board loading and unloading system according to claim 9, characterized in that, The connecting assembly (237) further includes a tension spring (2373), the housing (2371) is provided with a groove and a receiving space for accommodating the rotating member (2372), the rotating member (2372) is provided with a protrusion (23721) that moves along the groove, and the tension spring (2373) is connected between the protrusion (23721) and the housing (2371).

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