A screen and FPC pressing device

Abstract

The present invention relates to the field of screen processing technology, and in particular to a screen and FPC pressing device, comprising a workbench, a hot pressing assembly and a winding assembly. The workbench is provided with a working area for placing processing materials, and the hot pressing assembly comprises a drive shaft, a hot pressing head and a one-way transmission mechanism; the winding assembly comprises a new material winding wheel, a waste material winding wheel and a plurality of guide wheels; a rack is axially provided on the drive shaft, and the rack is connected to the waste material winding wheel through a one-way transmission mechanism. The drive shaft and the isolation tape of the present invention work in coordination with each other in that when the one-way transmission mechanism drives the waste material winding wheel to rotate when the hot pressing head approaches or moves away from the working area, the waste material winding wheel winds up the isolation tape, and the isolation tape of the working section is replaced during the movement of the hot pressing head, thereby shortening the time of a single screen and FPC pressing, improving the efficiency of the screen and FPC pressing process, and at the same time eliminating the drive mechanism for replacing the isolation tape, simplifying the equipment, and reducing the production cost of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of screen processing, and in particular to a screen and FPC pressing device. Background Art

[0002] The touchscreen manufacturing process involves using conductive adhesive to press-fit the touchscreen and FPC together. Prior art methods typically pre-fix the conductive adhesive to the touchscreen, align the FPC pins with the touchscreen, and then heat-press the conductive adhesive to achieve stable contact between the touchscreen and FPC. However, during the implementation of the present invention, the applicant discovered that, to prevent damage to the product during heat-pressing, an isolation strip was required between the hot pressing head and the conductive adhesive. However, the introduction of this isolation strip increased the manufacturing cost of the equipment. Summary of the Invention

[0003] The purpose of the present invention is to provide a screen and FPC pressing device to solve the above technical problems existing in the prior art, which mainly includes the following contents:

[0004] The present invention discloses a screen and FPC pressing device, comprising a workbench, a hot pressing assembly and a winding assembly, wherein a work area for placing processing materials is provided on the workbench, the hot pressing assembly comprises a drive shaft, a hot pressing head and a one-way transmission mechanism, the output end of the drive shaft is connected to the hot pressing head, and the input end of the drive shaft is used to connect to a power source to realize axial reciprocating movement of the drive shaft, so that the hot pressing head approaches or moves away from the work area; the winding assembly comprises a new material winding wheel, a waste material winding wheel and a plurality of guide wheels, the isolation tape wound on the new material winding wheel passes through the plurality of guide wheels in sequence and is connected to the waste material winding wheel, the plurality of guide wheels are used to change the winding path of the isolation tape, the winding path includes a working section, the working section is located between the working area and the hot pressing head, a rack is axially provided on the drive shaft, the rack is connected to the waste material winding wheel through a one-way transmission mechanism, and the one-way transmission mechanism is used to convert the axial movable stroke of the rack into the rotation stroke of the waste material winding wheel when the hot pressing head approaches or moves away from the work area, so as to realize the replacement of the isolation tape at the working section.

[0005] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0006] The drive shaft and the isolation tape of the present invention work in coordination. When the one-way transmission mechanism drives the waste winding wheel to rotate when the hot pressing head approaches or moves away from the working area, the waste winding wheel winds up the isolation tape. The isolation tape of the working section can be replaced during the movement of the hot pressing head, which can shorten the single screen and FPC pressing time and improve the screen and FPC pressing processing efficiency. At the same time, the isolation tape replacement drive mechanism is eliminated, the equipment is simplified, and the equipment production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0008] Figure 1 It is a structural schematic diagram of the pressing device of the present invention;

[0009] Figure 2 Schematic diagram of the connection structure of the hot pressing component and the winding component of the present invention;

[0010] Figure 3 It is a structural schematic diagram of the hot pressing assembly of the present invention;

[0011] Figure 4 Schematic diagram of the internal structure of the swing member of the present invention;

[0012] Figure 5 is a cross-sectional view of the swing member of the present invention;

[0013] Figure 6 It is a structural schematic diagram of the storage chamber of the present invention;

[0014] Figure 7 It is a structural schematic diagram of the one-way transmission assembly of the present invention;

[0015] Figure 8 is an exploded view of the first gear and the second gear of the present invention;

[0016] Figure 9 is an exploded view of the first gear and the second gear of the present invention from another perspective;

[0017] Figure 10 yes Figure 9 A partial enlarged view of point A in the middle.

[0018] In the picture:

[0019] 10. Workbench; 110. Working area; 20. Hot pressing assembly; 210. Drive shaft; 220. Rack; 230. Swinging member; 240. Hot pressing head; 241. Connecting rod; 242. Sliding rod; 243. Resetting member; 250. Storage chamber; 251. Piston; 252. Storage area; 260. Comparison tube; 261. Vertical section; 270. Power source; 30. Winding assembly; 310. New material winding wheel; 320. Guide wheel; 330. Waste material winding wheel; 40. One-way transmission mechanism; 410. First rotating shaft; 420. First gear; 421. Annular groove; 422. Wedge surface; 423. Abutment surface; 430. Second gear; 431. Limiting member; 432. Elastic member; 440. Gear set; 50. Isolation belt; 510. Working section. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0021] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0022] The touch screen production and processing process includes a process of using conductive glue to press the touch screen and FPC into shape. The principle is to pre-fix the conductive glue on the touch screen, then align the FPC pins and the touch screen, and then use the process of hot pressing the conductive glue to achieve stable pressing between the touch screen and the FPC. In order to prevent damage to the product during hot pressing of the conductive glue, an isolation tape needs to be set between the hot pressing head and the conductive glue. During the hot pressing process, the hot melt glue is easy to adhere to the isolation tape. In order to prevent the isolation tape with residual conductive glue from affecting the pressing and forming of the next touch screen and FPC, it is necessary to add a driving mechanism to replace the isolation tape during the interval of the hot pressing process. However, the introduction of the driving mechanism not only complicates the equipment structure, but also increases the manufacturing cost of the equipment. In order to solve the technical problem of high equipment preparation cost caused by the replacement of the isolation tape, the present invention provides a screen and FPC pressing device, which drives the isolation tape to be replaced in an orderly manner through the driving mechanism of the hot pressing head, eliminating the driving mechanism for replacing the isolation tape. At the same time, the replacement of the isolation tape is integrated into the hot pressing process. Compared with replacing the isolation tape during the interval of hot pressing processing, the efficiency of touch screen and FPC pressing is effectively improved, as shown in the following embodiments.

[0023] Example 1

[0024] Some embodiments of the present application provide a screen and FPC pressing device, such as Figures 1 to 3As shown, it includes a workbench 10, a hot pressing assembly 20 and a winding assembly 30. The workbench 10 is provided with a work area 110 for placing processing materials. In this embodiment, the processing material refers to the material on which the conductive glue has been fixed to the touch screen, and the FPC pins and the touch screen are aligned. The production technology for realizing the above-mentioned processing materials is existing technology and will not be described in detail here; the hot pressing assembly 20 includes a driving shaft 210, a hot pressing head 240 and a one-way transmission mechanism 40. The output end of the driving shaft 210 is connected to the hot pressing head 240, and the input end of the driving shaft 210 is used to connect to the power source 270. The power source 270 outputs kinetic energy to the driving shaft 210, driving the driving shaft 210 to move back and forth along the axial direction, and the hot pressing head 240 moves synchronously with the driving shaft 210, so that the hot pressing head 240 is close to or away from the working area 110. The power source 270 is existing technology, which can be a cylinder, a hydraulic cylinder, a motor, a wire The rod transmission assembly, etc., is not specifically limited here; the winding assembly 30 includes a new material winding wheel 310, a waste material winding wheel 330 and a plurality of guide wheels 320, the new material winding wheel 310 is a driven wheel, and the isolation belt 50 wound on the new material winding wheel 310 passes through the plurality of guide wheels 320 in turn and is connected to the waste material winding wheel 330, and the plurality of guide wheels 320 are used to change the winding path of the isolation belt 50, and the winding path includes a working section 510, the working section The working section 510 is located between the working area 110 and the hot pressing head 240. A rack 220 is axially arranged on the driving shaft 210. The rack 220 is connected to the waste winding wheel 330 through a one-way transmission mechanism 40. The one-way transmission mechanism 40 is used to convert the axial movable stroke of the rack 220 into the rotational stroke of the waste winding wheel 330 when the hot pressing head 240 approaches or moves away from the working area, so as to realize the replacement of the isolation belt 50 at the working section 510.When the screen and FPC are pressed and formed, the processing material is placed in the working area 110, and then the driving shaft 210 drives the hot pressing head 240 to move toward the processing material. During this process, the hot pressing head 240 first contacts the isolation belt 50 of the working section 510, and then drives the isolation belt 50 to move downward synchronously until the processing material is in place. Then the hot pressing head 240 works to heat-melt the conductive adhesive through the isolation belt 50, so that the conductive adhesive is evenly distributed between the screen and the FPC. After a preset time, the driving shaft 210 drives the hot pressing head 240 to retract, and the pressing process of the screen and the FPC can be completed. During this process, when the one-way transmission mechanism 40 drives the waste winding wheel 330 to rotate when the hot pressing head 240 approaches the working area 110, the waste winding wheel 330 winds up the isolation tape 50, and the isolation tape 50 of the working section 510 is replaced during the movement of the hot pressing head 240 toward the working area 110. It is preferred to complete the complete replacement of the isolation tape 50 in the working section 510 before the hot pressing head 240 and the isolation tape 50 come into contact, thereby shortening the single screen and FPC pressing time and improving the screen and FPC pressing processing efficiency. At the same time, the replacement drive mechanism of the isolation tape 50 is eliminated, the equipment is simplified, and the equipment production cost is reduced.

[0025] In some embodiments, the guide wheel 320 is a fixed pulley.

[0026] In some embodiments, under normal circumstances, there is a preset gap between the isolation belt 50 of the working section 510 and the processing material in the working area 110, so that during the process of retracting the hot pressing head 240, the isolation belt 50 is automatically separated from the processing material under the action of its own tension, which is convenient for replacing the isolation belt 50 and the processing material in the working area 110.

[0027] In some embodiments, in order to improve the quality of the screen and FPC pressing molding, the device can be set to further include a swinging member 230, the output end of the drive shaft 210 is rotatably connected to the swinging member 230, and the hot pressing head 240 is arranged at the bottom of the swinging member 230. Along the direction of gravity, the center of gravity of the swinging member 230 is below the rotation connection point between the drive shaft 210 and the swinging member 230, and the reciprocating movement of the drive shaft 210 is a reciprocating movement stroke along the direction of gravity; based on the above structural design, there is a defect when the conductive glue is pre-fixed on the touch screen, which allows the processed material and the hot pressing head 240 to be in contact with each other. When the contact is unbalanced, the swing part 230 and the drive shaft 210 cooperate to correct the contact angle between the hot pressing head 240 and the processing material, adapt to the inclination of the contact surface of the processing material caused by the pre-fixing defect of the conductive glue, so that the pressure of the drive shaft 210 can overcome the defect and be evenly transmitted to the processing material. Cooperate with the subsequent heating work to allow the conductive glue after hot melting to be redistributed evenly due to the pressure difference, thereby improving the product pressing processing quality, and avoiding the stress concentration caused by the pre-fixing defect of the conductive glue, which causes damage to the processing material, thereby improving the product pressing processing yield and reducing the processing loss cost.

[0028] In some embodiments, when performing hot pressing and bonding work on the screen and the FPC, increasing the tension of the isolation tape 50 helps to improve the quality of the hot pressing and bonding process. Figures 3 to 5 As shown, the hot pressing head 240 and the swinging member 230 can be set to have a sliding stroke along the direction of gravity, and the hot pressing head 240 is connected to the swinging member 230 through the reset member 243. Under normal circumstances, the hot pressing head 240 and the swinging member 230 are at the lower limit of the sliding stroke, and the maximum distance between the hot pressing head 240 and the swinging member 230 is maintained; based on the above structure, when the one-way transmission mechanism 40 drives the waste winding wheel 330 to rotate when the hot pressing head 240 approaches the working area 110, the drive shaft 210 moves downward, and at the same time, the waste winding wheel 330 is driven by the one-way transmission mechanism 40 to replace the isolation belt 50 of the working section 510, and the working section 510 is completed before the hot pressing head 240 contacts the isolation belt 50. The isolation tape 50 in 510 is completely replaced, and then the drive shaft 210 that continues to move downward will drive the isolation tape 50 to contact the processing material through the hot pressing head 240, so that the isolation tape 50 is clamped by the hot pressing head 240 and the processing material. At the same time, since there is a sliding stroke between the hot pressing head 240 and the swinging member 230, the drive shaft 210 has a certain stroke to continue moving downward. In this stroke, the swinging member 230 can be used to overcome the pre-fixation defect of the conductive adhesive, and the drive shaft 210 can also drive the waste winding wheel 330 to continue to wind up, tightening the clamped isolation tape 50, thereby helping to improve the distribution uniformity of the hot-melt conductive adhesive during hot pressing treatment and improving the quality of hot pressing bonding processing.

[0029] In some embodiments, in order to realize the detection of the uniformity of the contact pressure between the hot pressing head 240 and the processing material, Figures 2 to 6 As shown, at least two storage chambers 250 can be provided on the swing member 230, and a piston 251 is provided in the storage chamber 250. A storage area 252 for filling an observation medium is provided above the piston 251. The piston 251 is connected to the thermal pressure head 240 below by a connecting rod 241. The connecting rod 241 is symmetrically provided on both sides of the thermal pressure head 240. The storage area 252 is connected to the comparison tube 260. The diameter of the comparison tube 260 is smaller than the inner diameter of the storage area 252. The observation medium is used to feedback the local contact pressure between the thermal pressure head 240 and the processing material. The greater the local contact pressure between the thermal pressure head 240 and the processing material, the greater the amount of observation medium pushed into the comparison tube 260 by the piston 251. Based on the design that the diameter of the comparison tube 260 is smaller than the inner diameter of the storage area 252, the observation sensitivity of the observation medium in the comparison tube 260 can be effectively improved. Preferably, the ratio of the diameter of the comparison tube 260 to the inner diameter of the storage area 252 is 1:2~20.

[0030] In some embodiments, in order to facilitate the comparison and observation of the contact pressure between the hot pressing head 240 and the processed material, as shown in FIG. Figure 6 As shown, a comparison tube 260 can be provided including vertical sections 261 arranged along the direction of gravity, and the vertical sections 261 are arranged adjacent to each other. Based on the above structural design, the uniformity of the contact pressure between the hot pressing head 240 and the processed material can be judged by observing the height difference of the medium in the vertical section 261, and whether there is local stress concentration can be checked.

[0031] In some embodiments, in order to facilitate quantitative observation of the contact pressure between the hot pressing head 240 and the processed material, a marking unit can be set on the vertical segment 261, and the marking unit is used to assist in observing the observation medium in the vertical segment; the marking unit can be a numerical value or a scale line.

[0032] In some embodiments, in order to avoid damage to the processed material due to excessive local stress, a connecting pipe can be set between the head end of the comparison tube 260 and the storage area 252, and a pressure relief valve is provided at the tail end of the comparison tube 260. When the contact pressure between the local hot pressure head and the processed material is greater than a preset value, the contact pressure is correspondingly transmitted to the comparison tube 260 through the corresponding connecting rod 241 and the piston 251. Accordingly, the pressure in the comparison tube 260 is greater than the threshold, and the pressure relief valve opens to release the contact pressure between the hot pressure head 240 and the processed material at that location, thereby avoiding damage to the processed material at that location due to excessive contact pressure, and providing safety redundancy for the screen and FPC pressing work.

[0033] In some embodiments, in order to achieve uniform power transmission between the hot pressing head 240 and the swinging member 230, a sliding rod 242 can be provided on the hot pressing head 240, and a sliding groove matching the sliding rod 242 can be provided on the swinging member 230. The sliding rod 242 is connected to the inner wall of the sliding groove through a reset member 243. The center of gravity of the hot pressing head 240, the center of gravity of the swinging member 230, the sliding rod 242 and the sliding groove are arranged on the same straight line along the direction of gravity.

[0034] In some embodiments, in order to realize the one-way transmission mechanism 40, the axial movable stroke of the rack 220 is converted into the rotation stroke of the waste winding wheel 330, as shown in FIG. Figures 7 to 10 As shown, the one-way transmission mechanism 40 can be provided to include a first rotating shaft 410, a first gear 420 is provided on the first rotating shaft 410 to rotate coaxially, the first gear 420 is engaged with the rack 220, a second gear 430 is rotatably sleeved on the first rotating shaft 410, a limiting member 431 is provided on one of the second gear 430 and the first gear 420, the limiting member 431 is connected to the corresponding gear through an elastic member 432, and an annular groove 420 is provided on the other of the second gear 430 and the first gear 420. 1. A plurality of mating parts are provided in the annular groove 421. The mating parts are provided with a wedge surface 422 and an abutting surface 423. The abutting surface 423 is used to abut and cooperate with the limiting member 431 to realize synchronous rotation of the second gear 430 when the first gear 420 rotates clockwise. The wedge surface 422 is used to cooperate with the limiting member 431 to realize transmission unlocking between the first gear 420 and the second gear 430 when the first gear 420 rotates clockwise, and the second gear 430 is transmission-connected to the waste winding wheel 330.

[0035] In some embodiments, in order to control the amount of the waste winding wheel 330 that winds up the isolation belt 50 to match the rotation stroke of the waste winding wheel 330 driven by the rack 220, the second gear 430 can be arranged to be connected to the waste winding wheel 330 through the gear set 440; based on the above structure, the isolation belt 50 in the working section 510 is completely replaced before the hot pressing head 240 contacts the isolation belt 50. It should be noted that the gear set 440 is a prior art, and specifically can be at least one of a spur gear, a helical gear, a bevel gear, a worm gear, and a planetary gear, and is not specifically limited here.

[0036] In some embodiments, in order to realize the one-way transmission mechanism 40 to transmit kinetic energy to the waste winding wheel 330 in one direction during the extension or retraction of the drive shaft 210, so that the waste winding wheel 330 can replace the isolation belt 50, a rotation damping can be set on the rotating shaft of the waste winding wheel 330. The rotation damping is used to limit the rotation of the second gear 430 when the first gear 420 rotates clockwise, thereby preventing the second gear 430 from rotating synchronously with the first gear 420.

[0037] In some embodiments, in order to enable the one-way transmission mechanism 40 to transmit kinetic energy to the waste winding wheel 330 in one direction during the extension or retraction of the drive shaft 210, so that the waste winding wheel 330 can replace the isolation belt 50, the one-way transmission mechanism 40 can also be set as a ratchet structure.

[0038] In some embodiments, the one-way transmission mechanism 40 is preferably provided to convert the axial movable stroke of the rack 220 into the rotational stroke of the waste winding wheel 330 when the hot pressing head 240 approaches the working area 110, so as to replace the isolation belt 50 before the hot pressing work is carried out, thereby reducing the risk of the isolation belt 50 being contaminated by the environment.

[0039] In some embodiments, as the waste winding wheel 330 works for an increasing amount of time, the amount of isolation tape 50 accumulated on the waste winding wheel 330 increases, and the winding radius gradually increases. In order to avoid the problem of waste of isolation tape caused by an increase in the winding radius, the height of the hot pressing head 240 raised by the drive shaft 210 in the direction away from the working area 110 can be set to gradually decrease with the number of working times. Specifically, when the number of extension and retraction times of the drive shaft 210 reaches a preset number, the height of the first-level drive shaft 210 is reduced, and the corresponding rack 220 drives the waste winding wheel 330 to rotate. The replacement amount of the isolation tape 50 by the waste winding wheel 330 is controlled to avoid waste of the isolation tape 50 due to excessive replacement.

[0040] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0041] Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order depending on the functions involved. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0042] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A screen and FPC pressing device, characterized in that: The hot pressing assembly comprises a workbench, a hot pressing assembly and a winding assembly, wherein a working area for placing processed materials is provided on the workbench, the hot pressing assembly comprises a driving shaft, a hot pressing head and a one-way transmission mechanism, the output end of the driving shaft is connected to the hot pressing head, and the input end of the driving shaft is used to connect a power source to realize the axial reciprocating movement of the driving shaft, so that the hot pressing head approaches or moves away from the working area; the winding assembly comprises a new material winding wheel, a waste material winding wheel and a plurality of guide wheels, the isolation tape wound on the new material winding wheel passes through a plurality of guide wheels in turn and is connected to the waste winding wheel, and the plurality of guide wheels are used to change the winding path of the isolation tape, the winding path includes a working section, the working section is located between the working area and the hot pressing head, a rack is axially arranged on the driving shaft, and the rack is connected to the waste winding wheel through a one-way transmission mechanism, and the one-way transmission mechanism is used to convert the axial active stroke of the rack into the rotation stroke of the waste winding wheel when the hot pressing head approaches or moves away from the working area, so as to realize the replacement of the isolation tape at the working section.

2. The screen and FPC pressing device according to claim 1, characterized in that: The device also includes a swinging member, the output end of the drive shaft is rotatably connected to the swinging member, the hot pressing head is arranged at the bottom of the swinging member, and along the direction of gravity, the center of gravity of the swinging member is below the rotation connection point between the drive shaft and the swinging member, and the reciprocating movement of the drive shaft is a reciprocating movement stroke along the direction of gravity.

3. The screen and FPC pressing device according to claim 2, characterized in that: The thermal pressing head and the swinging member have a sliding stroke along the direction of gravity. The thermal pressing head is connected to the swinging member through a reset member. Under normal conditions, the thermal pressing head and the swinging member are at the lower limit of the sliding stroke, and the maximum distance between the thermal pressing head and the swinging member is maintained.

4. A screen and FPC pressing device according to claim 2 or 3, characterized in that: At least two storage chambers are provided on the swinging member, a piston is provided in the storage chamber, a storage area for filling the observation medium is provided above the piston, the bottom of the piston is connected to the thermal pressure head through a connecting rod, and the connecting rods are symmetrically provided on both sides of the thermal pressure head. The storage area is connected to the comparison tube, and the diameter of the comparison tube is smaller than the inner diameter of the storage area.

5. The screen and FPC pressing device according to claim 4, characterized in that: The contrast tube includes vertical sections arranged along the direction of gravity, and the vertical sections are adjacent to each other.

6. The screen and FPC pressing device according to claim 5, characterized in that: The vertical section is provided with a marking unit, and the marking unit is used to assist in observing the observation medium in the vertical section; The head end of the comparison tube is communicated with the storage area, and the tail end of the comparison tube is provided with a pressure relief valve.

7. The screen and FPC pressing device according to claim 4, characterized in that: A sliding rod is provided on the thermal pressure head, and a sliding groove matching the sliding rod is provided on the swinging member. The sliding rod is connected to the inner wall of the sliding groove through a reset member. The center of gravity of the thermal pressure head, the center of gravity of the swinging member, the sliding rod and the sliding groove are arranged on the same straight line along the direction of gravity.

8. The screen and FPC pressing device according to any one of claims 1 to 3, characterized in that: The one-way transmission mechanism includes a first rotating shaft, a first gear rotating coaxially provided on the first rotating shaft, the first gear meshing with the rack, a second gear rotatably sleeved on the first rotating shaft, a limiting member is provided on one of the second gear and the first gear, the limiting member is connected to the corresponding gear through an elastic member, an annular groove is provided on the second gear and the other of the first gear, a plurality of mating members are provided in the annular groove, a wedge surface and an abutting surface are provided on the mating member, the abutting surface is used to cooperate with the limiting member to realize synchronous rotation of the second gear when the first gear rotates clockwise, the wedge surface is used to cooperate with the limiting member to realize transmission unlocking between the first gear and the second gear when the first gear rotates clockwise, and the second gear is transmission-connected to the waste winding wheel.

9. The screen and FPC pressing device according to claim 8, characterized in that: The second gear is connected to the waste reel through a gear set; And / or, a rotation damper is provided on the rotating shaft of the waste winding wheel, and the rotation damper is used to limit the rotation of the second gear when the first gear rotates clockwise.

10. The screen and FPC pressing device according to any one of claims 1 to 3, characterized in that: The one-way transmission mechanism is used to convert the axial movable stroke of the rack into the rotational stroke of the waste winding wheel when the hot pressing head approaches the working area; The height of the thermal pressing head raised by the driving shaft in a direction away from the working area gradually decreases with the number of operations.

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