Roller press for flexible circuit board

Abstract

The utility model belongs to the technical field of printed circuit board manufacturing, and relates to a roller press for a flexible circuit board, which comprises a control box and a rolling mechanism. The control box comprises a box body and two limiting baffles arranged on the upper surface of the box body, the two limiting baffles are arranged in parallel, and a channel for the flexible circuit board to pass through is formed in the upper surface of the box body; the rolling mechanism comprises a supporting frame connected to the box body, a driving roller assembly arranged in the box body and a driven roller assembly arranged on the upper portion of the supporting frame, the driving roller assembly comprises a driving roller located below the channel, and the driven roller assembly comprises a driven roller located above the channel; the driven roller comprises a heating shaft which is horizontally and fixedly arranged, a bearing which is positioned outside the heating shaft and a high-temperature-resistant silica gel layer which is positioned outside the bearing; and a temperature control display for displaying the real-time temperature of the heating shaft and a rotating speed controller for controlling the rotating speed of the driving roller are arranged on the side wall of the box body. The roller press not only can meet the fast-paced hot rolling requirement, but also can prevent the sticking piece from being damaged due to overlarge rolling force.

Description

Technical Field

[0001] The utility model relates to the technical field of printed circuit board manufacturing, in particular to a rolling machine for flexible circuit boards. Background Art

[0002] Flexible circuit board, referred to as soft board or FPC, is a highly reliable and excellent flexible printed circuit board made of polyimide or polyester film as the substrate. It has the characteristics of high wiring density, light weight and thin thickness.

[0003] In order to facilitate the shading design requirements of fixing the FPC body and backlight products during the subsequent assembly of the whole machine, it is necessary to stick adhesives of various sizes on the front and back of different products. Usually, bubbles will be generated after the FPC adhesive is pasted, the adhesion between the colloid and the FPC is poor, and there will be abnormalities such as reverse release. The larger the pasting size, the higher the defective rate.

[0004] Chinese patent CN216391506U discloses an efficient FPC compensation sheet mounting machine, which adopts a heating molding method for bonding. According to different product sizes, multiple sets of pressing carriers are opened. During operation, the action process of fixing the board → placing the board → pressing → taking the board is required. The working hours and efficiency are low, and the machine equipment is large in size and difficult to carry. Various supporting carriers are stored together and take up space.

[0005] Chinese patent CN201986270U discloses an FPC laminating machine, which uses upper and lower rollers to laminate the FPC passing through the frame onto the panel. The upper roller is divided into a laminating section and a material-allowing section with an outer diameter smaller than the laminating section, so that the material section avoids the FPC surface and achieves non-destructive and non-repeated rolling. However, if the adhesive backing is applied, the rolled part must be in the FPC area, and there are uneven patches on the FPC. If the pressure is too high, it is easy to damage the patch.

[0006] Therefore need to provide a kind of new rolling machine to solve the above problems. Summary of the invention

[0007] The main purpose of the utility model is to provide a rolling machine for a flexible circuit board, which can not only meet the needs of fast-paced hot rolling, but also avoid damage to the patch due to excessive rolling force.

[0008] The utility model achieves the above-mentioned purpose through the following technical solutions: A rolling machine for flexible circuit boards, comprising a control box and a rolling mechanism;

[0009] The control box comprises a box body and two limit baffles arranged on the upper surface of the box body, wherein the two limit baffles are arranged in parallel and form a channel on the upper surface of the box body for the flexible circuit board to pass through;

[0010] The rolling mechanism includes a support frame connected to the box body, an active roller assembly arranged in the box body, and a driven roller assembly arranged on the upper part of the support frame, wherein the active roller assembly includes an active roller located below the channel, and the driven roller assembly includes a driven roller located above the channel, and the driven roller includes a horizontally fixed heating shaft, a bearing located outside the heating shaft, and a high-temperature resistant silicone layer located outside the bearing;

[0011] The side wall of the box body is provided with a temperature control display for displaying the real-time temperature of the heating shaft and a speed controller for controlling the speed of the active roller.

[0012] Specifically, the active roller assembly also includes an active synchronous wheel fixed to one end of the active roller, a speed regulating motor fixed in the box, a driven synchronous wheel driven by the speed regulating motor, and a synchronous belt for transmitting the active synchronous wheel and the driven synchronous wheel.

[0013] Specifically, the support frame includes a plurality of guide columns connected to the box body and a top plate fixed to the upper ends of all the guide columns, the driven roller assembly also includes a lifting plate and a lifting frame passed through by all the guide columns, and the lifting plate and the lifting frame are both provided with linear bearings that cooperate with the guide columns; the driven roller is pivotally connected to the lower part of the lifting frame, and two pressure sensors are clamped between the lifting plate and the lifting frame, and the two pressure sensors are located on both sides above the channel, the lifting plate is threadedly connected to the top plate through two pressure adjusting nuts, the pressure adjusting nuts adjust the vertical distance between the upper surface of the lifting plate and the lower surface of the top plate, and the pressure adjusting nuts are located close to the pressure sensors; the side wall of the box body is provided with a pressure gauge for displaying the pressure value measured by the pressure sensor.

[0014] Furthermore, the active roller is a rubber roller.

[0015] Furthermore, height limiting blocks for limiting the highest position of the lifting frame are provided on both sides of the top plate, and the lifting plate avoids the space of the height limiting blocks.

[0016] Specifically, a pair of opposite side surfaces of the box body are respectively provided with handles.

[0017] The beneficial effects of the technical solution of the utility model are:

[0018] This rolling machine can use a specially designed driven roller to complete the rolling operation, adopt a fixed heating shaft to provide heat to help the adhesive backing stick to the flexible circuit board, use a high-temperature resistant silicone layer to adapt to the uneven patch structure on the flexible circuit board, and use bearings to make the high-temperature resistant silicone layer rotate around the heating shaft, thereby improving the efficiency of adhesive backing and preventing the patches on the flexible circuit board from being broken by excessive rolling pressure, thereby ensuring the quality of adhesive backing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of a rolling machine;

[0020] Figure 2 is a three-dimensional diagram of the control box;

[0021] Figure 3 is a three-dimensional diagram of a rolling mechanism;

[0022] Figure 4 It is a cross-sectional view of the active roller.

[0023] The numbers in the figure represent:

[0024] 1-control box, 11-box, 12-limit baffle, 13-pressure gauge, 14-speed controller, 15-temperature control display, 16-handle;

[0025] 2-Rolling mechanism,

[0026] 21-support frame, 211-guide column, 212-top plate, 2121-height limit block,

[0027] 22-active roller assembly, 221-active roller, 222-active synchronous wheel, 223-speed regulating motor, 224-driven synchronous wheel,

[0028] 23-driven roller assembly, 231-driven roller, 2311-heating shaft, 2312-bearing, 2313-high temperature resistant silicone layer, 232-lifting plate, 233-pressure adjusting nut, 234-lifting frame, 235-pressure sensor, 236-linear bearing. DETAILED DESCRIPTION

[0029] The utility model is further described in detail below in conjunction with specific embodiments.

[0030] Example:

[0031] like Figures 2 to 4 As shown, a rolling machine for a flexible circuit board of the utility model comprises a control box 1 and a rolling mechanism 2.

[0032] like Figure 1 and Figure 2 As shown, the control box 1 includes a box body 11, two limit baffles 12 arranged on the upper surface of the box body 11, a pressure gauge 13 arranged on the side of the box body 11, a speed controller 14, a temperature control display 15 and a pair of handles 16; the two limit baffles 12 are arranged in parallel and form a channel for the flexible circuit board to pass through on the upper surface of the box body 11; the pair of handles 16 are respectively arranged on a pair of opposite sides of the box body 11.

[0033] like Figure 3 and Figure 4 As shown, the rolling mechanism 2 includes a support frame 21 connected to the box body 11, an active roller assembly 22 arranged in the box body 11, and a driven roller assembly 23 arranged on the upper part of the support frame 21, the active roller assembly 22 includes an active roller 221 located below the channel, the driven roller assembly 23 includes a driven roller 231 located above the channel, and the driven roller 231 includes a horizontally fixed heating shaft 2311, a bearing 2312 located outside the heating shaft 2311, and a high-temperature resistant silicone layer 2313 located outside the bearing 2312; the speed of the active roller 221 is controlled by the speed controller 14. The active roller 221 is a rubber roller. The temperature control display 15 is used to display the real-time temperature of the heating shaft 2311.

[0034] The active roller 221 is powered, and the driven roller 231 is unpowered. When the flexible circuit board passes through the channel, it must pass through the gap between the active roller 221 and the driven roller 231. The upper surface of the flexible circuit board is subjected to the downward pressure of the driven roller 231. The active roller 221 generates friction on the lower surface of the flexible circuit board, which then moves it toward the channel exit. The upper surface of the flexible circuit board also generates friction on the driven roller 231, which makes it rotate at the same linear speed as the active roller 221. When the upper surface of the flexible circuit board is to be affixed with adhesive, the driven roller 231 will make it fit the patch on the surface of the flexible circuit board tightly. The high-temperature resistant silicone layer 2313 has good elasticity and heat resistance, so on the one hand, it can transfer the heat generated by the heating shaft 2311 to the adhesive, and on the other hand, it can prevent the patch protruding from the upper surface of the flexible circuit board from being damaged by too much pressure. The heating shaft 2311 needs to wait until the heating speed is stabilized at a relatively high temperature before starting the rolling operation. The temperature control display 15 is used to monitor whether the heating condition of the heating shaft 2311 has stabilized. The speed controller 14 adjusts the time for the flexible circuit board to pass through the channel by controlling the speed of the active roller 221, so that the adhesive is fully heated and adheres to the upper surface of the flexible circuit board. If the passing time is too short, the adhesive adhesion is insufficient, and if the passing time is too long, the work efficiency is low. In the case where the active roller 221 is a rubber roller, the surface is also elastic. If the flexible circuit board needs double-sided adhesive, the active roller 221 can also stick the adhesive on the back to the uneven surface, which can also achieve the purpose of avoiding crushing the patch.

[0035] like Figure 3 As shown, the active roller assembly 22 also includes an active synchronous wheel 222 fixed to one end of the active roller 221, a speed regulating motor 223 fixed in the box body 11, a driven synchronous wheel 224 driven by the speed regulating motor 223, and a synchronous belt (not shown) for transmitting the active synchronous wheel 222 and the driven synchronous wheel 224.

[0036] The synchronous belt transmission method can save the axial space of the active roller 221 and avoid the problem of large wear on parts caused by the axial deviation between the active roller 221 and the speed regulating motor 223.

[0037] like Figure 3 As shown, the support frame 21 includes a plurality of guide columns 211 connected to the box body 11 and a top plate 212 fixed to the upper ends of all the guide columns 211. The driven roller assembly 23 also includes a lifting plate 232 and a lifting frame 233 passed through by all the guide columns 211. The lifting plate 232 and the lifting frame 233 are both provided with a linear bearing 236 that cooperates with the guide columns 211. The driven roller 231 is pivotally connected to the lower part of the lifting frame 233. Two pressure sensors 235 are sandwiched between the lifting plate 232 and the lifting frame 233. The two pressure sensors 235 are located on both sides above the channel. The pressure gauge 13 is used to display the pressure value measured by the pressure sensor 235. The lifting plate 232 is threadedly connected to the top plate 212 through two pressure regulating nuts 233. The pressure regulating nuts 233 adjust the vertical distance between the upper surface of the lifting plate 232 and the lower surface of the top plate 212. The pressure regulating nuts 233 are located close to the pressure sensor 235.

[0038] The lifting plate 232 and the lifting frame 233 must move strictly along the guide column 211. The two pressure adjustment nuts 233 are used together to adjust the height of the lifting plate 232, so as to control the maximum pressure generated when the driven roller 231 is subjected to the pressure reaction force of the flexible circuit board. The real-time pressure during rolling will be reflected on the pressure gauge 13, so the absolute height of the lifting plate 232 can be adjusted by synchronously rotating the two pressure adjustment nuts 233 to control the pressure acting on the adhesive. If the pressure is too small, the adhesive will not stick firmly, and if the pressure is too large, it is easy to crush the patch. For flexible circuit boards of different thicknesses, it is necessary to adjust the height of the lifting plate 232 relative to the channel to ensure the stability of the rolling quality and to flexibly use it in more products. During debugging, a test board with uniform thickness can be allowed to replace the flexible circuit board through the channel. At this time, the two pressure gauges 13 will display two values. If the two values ​​are not equal, it means that the side with a larger reading on the lifting plate 232 is slightly lower than the side with a smaller reading, so reverse adjustment is required until the two values ​​are consistent. This ensures that the axis of the driven roller 231 is parallel to the axis of the active roller 221, and the gap distance between the active roller 221 and the driven roller 231 is uniform.

[0039] like Figure 3 As shown, height limiting blocks 2121 for limiting the highest position of the lifting frame 233 are provided on both sides of the top plate 212 , and the lifting plate 232 avoids the space of the height limiting blocks 2121 .

[0040] The detection distance of the pressure sensor 235 is very small. If there is no height limit block 2121, the lifting frame 233 will rise indefinitely, and the pressure sensor 235 will be over-extruded and damaged before it is adjusted into place. With the height limit block 2121, the lifting frame 233 will only rise to the point where it contacts the bottom surface of the height limit block 2121. The height limit block 2121 offsets part of the pressure, thereby protecting the pressure sensor 235. When this problem occurs, just increase the height of the lifting plate 232, and the roller press can be put into use only when the maximum pressure value reaches a reasonable range.

[0041] The rolling machine can utilize a specially designed driven roller 231 to complete the rolling operation, and adopts a fixed heating shaft 2311 to provide heat to help the adhesive backing adhere to the flexible circuit board. The high-temperature resistant silicone layer 2313 is used to adapt to the uneven patch structure on the flexible circuit board. The bearing 2312 is used to make the high-temperature resistant silicone layer 2313 rotate around the heating shaft 2311, thereby improving the efficiency of the adhesive backing and preventing the patches on the flexible circuit board from being broken by excessive rolling pressure, thereby ensuring the quality of the adhesive backing.

[0042] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A rolling machine for flexible circuit boards, characterized in that: Including a control box and a rolling mechanism; The control box comprises a box body and two limit baffles arranged on the upper surface of the box body, wherein the two limit baffles are arranged in parallel and form a channel on the upper surface of the box body for the flexible circuit board to pass through; The rolling mechanism includes a support frame connected to the box body, an active roller assembly arranged in the box body, and a driven roller assembly arranged on the upper part of the support frame, wherein the active roller assembly includes an active roller located below the channel, and the driven roller assembly includes a driven roller located above the channel, and the driven roller includes a horizontally fixed heating shaft, a bearing located outside the heating shaft, and a high-temperature resistant silicone layer located outside the bearing; The side wall of the box body is provided with a temperature control display for displaying the real-time temperature of the heating shaft and a speed controller for controlling the speed of the active roller.

2. The rolling machine for flexible circuit boards according to claim 1, characterized in that: The active roller assembly also includes an active synchronous wheel fixed to one end of the active roller, a speed regulating motor fixed in the box, a driven synchronous wheel driven by the speed regulating motor, and a synchronous belt for transmitting the active synchronous wheel and the driven synchronous wheel.

3. The rolling machine for flexible circuit board according to claim 1, characterized in that: The support frame includes a plurality of guide columns connected to the box body and a top plate fixed to the upper ends of all the guide columns, the driven roller assembly also includes a lifting plate and a lifting frame passed through by all the guide columns, and the lifting plate and the lifting frame are both provided with linear bearings that cooperate with the guide columns; the driven roller is pivotally connected to the lower part of the lifting frame, and two pressure sensors are clamped between the lifting plate and the lifting frame, and the two pressure sensors are located on both sides above the channel, and the lifting plate is threadedly connected to the top plate through two pressure adjusting nuts, and the pressure adjusting nuts adjust the vertical distance between the upper surface of the lifting plate and the lower surface of the top plate, and the pressure adjusting nuts are located close to the pressure sensor; the side wall of the box body is provided with a pressure gauge for displaying the pressure value measured by the pressure sensor.

4. The rolling machine for flexible circuit boards according to claim 1 or 3, characterized in that: The active roller is a rubber roller.

5. The rolling machine for flexible circuit board according to claim 3, characterized in that: Height limiting blocks for limiting the highest position of the lifting frame are arranged on both sides of the top plate, and the lifting plate avoids the space of the height limiting blocks.

6. The rolling machine for flexible circuit boards according to claim 1, characterized in that: A pair of opposite sides of the box body are respectively provided with handles.

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