A CCD web assembly machine

Abstract

The present application relates to printed circuit board technical field, disclose a kind of CCD coiled material assembly machine, comprising: assembly machine main body, the discharge end of assembly machine main body is provided with parabola generating mechanism, for detecting the tension of PCB finished product transparent film;Parabola generating mechanism includes first lift head and second lift head sequentially arranged along PCB circuit discharge path, parabolic forming area is formed between first lift head and second lift head, when PCB circuit passes through the area, the natural parabolic shape of opening upward is formed by the collaborative push of two lift heads, and movable sensor device is arranged below the parabolic shape;The present application counter-tension compensation component realizes closed-loop control of tension compensation by sandwich type pressing structure, which is characterized by deep coupling of mechanical deformation and intelligent algorithm.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of printed circuit board, more particularly, it relates to a CCD roll assembly machine. BACKGROUND

[0002] In the automatic production process of PCB (printed circuit board) roll, the tension control of the film covering process is the core and key link affecting the final quality of the product, because the PCB roll is usually processed in the form of continuous roll, and the film covering process, as an indispensable part, needs to accurately and smoothly paste the functional film such as protective film and insulating film on the surface of the circuit board substrate.

[0003] The existing equipment usually adopts fixed sensors for fixed point tension detection, which cannot dynamically scan the tension distribution of the whole path of the PCB circuit. Since the PCB circuit is prone to local tension fluctuation due to factors such as material elasticity and equipment vibration during operation, fixed point detection cannot accurately reflect the overall tension state, resulting in insufficient compensation accuracy. Therefore, we propose a CCD roll assembly machine. SUMMARY

[0004] The present application provides a CCD roll assembly machine, which solves the technical problem of insufficient compensation accuracy caused by the difficulty of fixed point detection in accurately reflecting the overall tension state in the related art.

[0005] The present application provides a CCD roll assembly machine, which comprises: an assembly machine main body, a parabolic generating mechanism is arranged at the discharge end of the assembly machine main body, which is used for detecting the tension of the transparent film of the finished PCB product;

[0006] The parabolic generating mechanism comprises a first film lifting head and a second film lifting head arranged in sequence along the discharge path of the PCB circuit, and a parabolic forming area is formed between the first film lifting head and the second film lifting head. When the PCB circuit passes through the area, the two film lifting heads cooperatively push and lift to form a natural parabolic shape with the opening upward. A movable sensor device is arranged below the parabolic shape.

[0007] The counter-tension compensation assembly comprises a film pressing plate and a PCB circuit fixing plate, and the PCB circuit sequentially passes through the clamping channel formed by the film pressing plate and the PCB circuit fixing plate. A plurality of counter-tension lifting assemblies are arranged at the bottom of the PCB circuit fixing plate.

[0008] The tension data of the PCB circuit after film covering is collected in real time by the sensor device, and after being processed by the system algorithm, the counter-tension lifting assembly drives the PCB circuit fixing plate and the film pressing plate to bend and deform synchronously, realizing sandwich type compression counter-tension compensation.

[0009] Further, the first film lifting head comprises a pneumatic push rod one, an extension arm one, a film lifting plate one and a film pressing column one, the pneumatic push rod one is fixed in the bottom wall near the discharge end of the assembly machine body, the pneumatic push rod one is fixedly provided on the telescopic arm, the film lifting plate one is provided above the pneumatic push rod one, and the film pressing column one is provided above the film lifting plate one.

[0010] Further, the two ends of the film pressing column one are fixedly provided with the extension arm one, and the end of the extension arm one away from the film pressing column one is fixedly connected with the pneumatic push rod one, the film lifting plate one is made of hard material, the outer wall of the film pressing column one is made of soft material, the film lifting plate one is semicylindrical, and the arc surface faces one side of the film pressing column one, and the coated PCB line passes through the gap between the film lifting plate one and the film pressing column one.

[0011] Further, the second film lifting head comprises a pneumatic push rod two, a film lifting plate two, an extension arm two and a film pressing column two, the pneumatic push rod two is fixed on one side of the discharge end of the first film lifting head, the pneumatic push rod two is fixedly provided on the telescopic arm, the film lifting plate two is provided above the pneumatic push rod two, and the film pressing column two is provided above the film lifting plate two, the two ends of the film pressing column two are fixedly provided with the extension arm two, and the end of the extension arm two away from the film pressing column one is fixedly connected with the pneumatic push rod two.

[0012] Further, the film lifting plate two is made of hard material, the outer wall of the film pressing column two is made of soft material, the coated PCB line passing through the film lifting plate one and the film pressing column one, then passing through the gap between the film lifting plate two and the film pressing column two, and finally passing through the film pressing plate and the PCB line fixing plate.

[0013] Further, the space between the first film lifting head and the second film lifting head is fixedly provided with a film passing bottom box, the upper surface of the film passing bottom box is provided with a sliding groove, the sliding groove is transversely coincident with the transverse center line of the film passing bottom box, the sliding groove is slidably provided with a sliding seat, and the sliding seat is fixedly provided with a sensor.

[0014] Further, two driving screws are rotatably arranged in the film passing bottom box, and the two driving screws respectively penetrate into the sliding seat, the sliding seat is threadedly connected with the driving screws, the top ends of the two driving screws are connected through a transmission belt, the driving end of the driving screw is provided with a servo motor, and the servo motor is fixedly connected with the film passing bottom box.

[0015] Further, the counter-tension compensation assembly further comprises a film passing box, the film passing box is fixedly provided with a fixing frame, and the center position of the fixing frame is fixedly provided with an electric push rod.

[0016] Further, the upper wall of the film pressing plate is fixedly provided with a plurality of plastic strips and a pressure bearing frame, the pressure bearing frame is H-shaped, the center position of the pressure bearing frame is fixedly connected with the telescopic arm of the electric push rod, the height of the pressure bearing frame is greater than the total height of the film pressing plate and the PCB line fixing plate, and the plurality of plastic strips are transverse and the same as the advancing direction of the PCB line.

[0017] Further, the counter-tension pushing assembly comprises counter-tension pushing plates, and micro-control pushing rods are fixedly arranged below the counter-tension pushing plates; the counter-tension pushing plates are parallel to each other and perpendicular to the running direction of the PCB line; and the wires of the micro-control pushing rods are connected with the system.

[0018] The present application has the following advantages:

[0019] The present application realizes the accurate tension control in the PCB film coating process through the parabola generating mechanism, and the core innovation is to construct a dynamic parabola forming system; the cooperative pushing action of the first lifting head and the second lifting head enables the PCB line to complete the film coating in a natural parabola trajectory; the stress concentration problem in the traditional linear processing is effectively dispersed through the geometric optimization; and the movable sensor device forms a three-dimensional monitoring network at the bottom of the parabola, and can capture the micro tension fluctuation in real time.

[0020] The counter-tension compensation assembly realizes closed-loop control of tension compensation through a sandwich type pressing structure, which deeply couples mechanical deformation and intelligent algorithm; the clamping channel formed by the pressing plate and the fixed plate has elastic deformation space; in cooperation with the multiple groups of independently controlled counter-tension pushing assemblies at the bottom, the system can predict the tension change trend through analysis algorithm, and drive the pressing plate to generate compensation deformation in the opposite direction of the film coating tension. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the present application;

[0022] Figure 2 is a schematic diagram of the first lifting head structure of the present application;

[0023] Figure 3 is a schematic diagram of the second lifting head structure of the present application;

[0024] Figure 4 is a schematic diagram of the film passing bottom box structure of the present application;

[0025] Figure 5 is a schematic diagram of the sensor device structure of the present application;

[0026] Figure 6 is a schematic diagram of the initial state structure of the counter-tension pushing plate of the present application;

[0027] Figure 7 is a schematic diagram of the compensation state structure of the counter-tension pushing plate of the present application;

[0028] Figure 8 is a schematic diagram of the counter-tension pushing plate structure of the present application.

[0029] In the diagram: 11. Assembly machine main body; 2. Parabola generation mechanism; 21. First lifting film head; 211. Pneumatic push rod one; 212. Extension arm one; 213. Lifting film plate one; 214. Pressing film column one; 22. Second lifting film head; 221. Pneumatic push rod two; 222. Lifting film plate two; 223. Extension arm two; 224. Pressing film column two; 23. Film conveying box; 24. Sensor component; 25. Slide seat; 26. Slide groove; 27. Drive screw; 28. Transmission belt; 29. ​​Servo motor; 31. Film conveying box; 32. Fixing frame; 33. Electric push rod; 34. Pressure bearing frame; 35. Pressing film plate; 36. Plastic strip; 37. PCB circuit fixing board; 38. Micro-controlled push rod; 39. Anti-tension push plate. Detailed Implementation

[0030] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0031] like Figure 1 - Figure 8 As shown, a CCD roll assembly machine includes: an assembly machine body 11, and a parabola generating mechanism 2 is provided at the discharge end of the assembly machine body 11 for detecting the tension of the transparent film of the finished PCB.

[0032] The parabola generating mechanism 2 includes a first lifting head 21 and a second lifting head 22 arranged sequentially along the PCB circuit discharge path. A parabola forming area is formed between the first lifting head 21 and the second lifting head 22. When the PCB circuit passes through this area, it forms a natural parabola shape with an upward opening through the coordinated lifting action of the two lifting heads. A movable sensor 24 is arranged below the parabola shape.

[0033] The anti-tension compensation assembly includes a pressure plate 35 and a PCB circuit fixing plate 37. The PCB circuit passes through the clamping channel formed by the pressure plate 35 and the PCB circuit fixing plate 37 in sequence. The bottom of the PCB circuit fixing plate 37 is equipped with multiple sets of anti-tension lifting assemblies.

[0034] The system collects tension data of the PCB circuit after lamination in real time through sensor 24. After processing by the system algorithm, it controls the anti-tension pushing component to drive the PCB circuit fixing plate 37 and the pressure plate 35 to bend and deform synchronously, so as to realize sandwich-type pressing anti-tension compensation.

[0035] The first lifting film head 21 includes a pneumatic push rod 211, an extension arm 212, a lifting film plate 213, and a pressing film column 214. The pneumatic push rod 211 is fixed in the bottom wall near the discharge end of the assembly machine body 11. The lifting film plate 213 is fixedly installed on the telescopic arm of the pneumatic push rod 211, and the pressing film column 214 is arranged parallel above the lifting film plate 213.

[0036] Extension arms 212 are fixedly installed at both ends of the film pressing column 214, and the end of the extension arm 212 away from the film pressing column 214 is fixedly connected to the pneumatic push rod 211. The lifting plate 213 is made of rigid material, and the outer wall of the film pressing column 214 is made of soft material. The lifting plate 213 is semi-cylindrical, and the arc surface faces the side of the film pressing column 214. The PCB circuit after film coating passes through the gap between the lifting plate 213 and the film pressing column 214.

[0037] The second lifting film head 22 includes a pneumatic push rod 221, a lifting film plate 222, an extension arm 223, and a pressure column 224. The pneumatic push rod 221 is fixed to one side of the discharge end of the first lifting film head 21. The lifting film plate 222 is fixedly installed on the telescopic arm of the pneumatic push rod 221. The pressure column 224 is arranged parallel above the lifting film plate 222. Extension arms 223 are fixedly installed at both ends of the pressure column 224, and the end of the extension arm 223 away from the pressure column 214 is fixedly connected to the pneumatic push rod 221.

[0038] The second lifting film plate 222 is made of rigid material, while the outer wall of the second pressing film column 224 is made of flexible material. The coated PCB circuit passes through the lifting film plate 213 and the first pressing film column 214, then passes through the gap between the second lifting film plate 222 and the second pressing film column 224, and finally passes through the pressing film plate 35 and the PCB circuit fixing plate 37.

[0039] A membrane bottom box 23 is fixedly arranged in the space between the first lifting membrane head 21 and the second lifting membrane head 22. A sliding groove 26 is opened on the upper surface of the membrane bottom box 23, and the sliding groove 26 is horizontally aligned with the horizontal center line of the membrane bottom box 23. A sliding seat 25 is slidably arranged inside the sliding groove 26, and a sensor component 24 is fixedly arranged on the sliding seat 25.

[0040] The inner cavity of the lamination base box 23 is equipped with two drive screws 27, which are respectively inserted into the interior of the slide block 25. The slide block 25 is threadedly connected to the drive screws 27. The top ends of the two drive screws 27 are connected by a transmission belt 28. The drive end of the drive screws 27 is equipped with a servo motor 29, which is fixedly connected to the lamination base box 23.

[0041] The anti-tension compensation assembly also includes a film-passing box 31, on which a fixing frame 32 is fixedly installed, and an electric push rod 33 is fixedly installed at the center of the fixing frame 32.

[0042] The upper wall of the film pressing plate 35 is fixedly provided with a plurality of plastic strips 36 and a pressure bearing frame 34. The pressure bearing frame 34 is H-shaped, the center of the pressure bearing frame 34 is fixedly connected with the telescopic arm of the electric push rod 33, the height of the pressure bearing frame 34 is greater than the total height of the film pressing plate 35 and the PCB line fixing plate 37, and the plurality of plastic strips 36 are transverse and the same as the running direction of the PCB line.

[0043] The counter-tension push-up assembly comprises a counter-tension push plate 39, the lower side of the counter-tension push plate 39 is fixedly provided with a micro-control push rod 38, a plurality of counter-tension push plates 39 are parallel to each other and perpendicular to the running direction of the PCB line, and the wires of a plurality of micro-control push rods 38 are connected with the system.

[0044] In use, after the film coating is completed, the PCB line first passes through the first film lifting head 21, then passes over the upper side of the sensor device 24, then passes through the second film lifting head 22, and finally passes through the film passing box 31;

[0045] Through the simultaneous work of the pneumatic push rod one 211 and the pneumatic push rod two 221, the film lifting plate one 213 and the film lifting plate two 222 are pushed to rise, and the PCB line is simultaneously lifted by the rising of the two. When the film lifting plate one 213 and the film lifting plate two 222 rise to a preset value, the PCB line is clamped between the film lifting plate one 213 and the film pressing column one 214, the other end is tightly clamped by the film lifting plate two 222 and the film pressing column two 224, and the middle segment of the PCB line naturally droops to form an open upward parabola.

[0046] The film lifting plate one 213 and the film lifting plate two 222 are made of hard material, which can ensure that the PCB line is lifted with the same contact surface each time, and the film pressing column one 214 and the film pressing column two 224 are made of soft material, which can protect the PCB line.

[0047] When the PCB line is lifted, the servo motor 29 works, the two drive screws 27 are rotated by the transmission belt 28, the sliding seat 25 slides along the sliding groove 26, and the sensor device 24 reciprocally runs along the PCB line running route, so that the sensor device 24 detects the parabola formed by the PCB line, detects the data of the PCB line, and the greater the tension of the PCB line after the film coating, the lower the lowest end of the parabola, and vice versa. The data detected by the sensor device 24 is transmitted to the system, and the system calculates the data.

[0048] After the tension detection of the PCB line by the sensor device 24 is completed, the pneumatic push rod one 211 and the pneumatic push rod two 221 simultaneously control the film lifting plate one 213 and the film lifting plate two 222 to descend, so that the two ends of the PCB line naturally droop on the film passing bottom box 23, and then the PCB line is conveyed to the clamping area of the film pressing plate 35 and the PCB line fixing plate 37.

[0049] At this time, the film pressing plate 35 is lowered by the electric push rod 33 to tightly press the PCB circuit between the film pressing plate 35 and the PCB circuit fixing plate 37, and then according to the data detected by the sensor 24, the system controls a plurality of micro-control push rods 38 to work to drive a plurality of anti-tension push plates 39 to rise;

[0050] According to the data detected by the sensor 24 in different regions of the parabola, the system controls the anti-tension push plates 39 in the corresponding positions to rise to different heights, thereby more favorably compensating the tension accurately;

[0051] The anti-tension push plates 39 rise to push the PCB circuit fixing plate 37, so that the PCB circuit fixing plate 37 bends upward, so that the PCB circuit is bent between the film pressing plate 35 and the PCB circuit fixing plate 37, preventing dislocation friction, thereby reducing the influence on the PCB circuit, and forming sandwich clamping and bending;

[0052] After the tension compensation is completed, the micro-control push rod 38 drives the anti-tension push plate 39 to reset, and the film pressing plate 35 and the PCB circuit fixing plate 37 are re-horizontally through the backtracking elasticity of a plurality of plastic strips 36. After the PCB circuit is pressed flat, the film pressing plate 35 is raised by the electric push rod 33, and finally the PCB circuit continues to proceed to the next step.

[0053] Parabolic tension detection structure: through the cooperative lifting of the first lifting head 21 and the second lifting head 22, a natural parabolic shape with an upward opening is formed, the linear relationship between the lowest point height of the parabola and the tension is used to realize non-contact tension detection, and the combination of the hard lifting plate and the soft film pressing column ensures the stability of the contact surface and avoids crushing the PCB circuit.

[0054] Dynamic scanning type sensor layout: the movable sensor 24 realizes reciprocating motion through the screw rod 27 driven by the servo motor 29, can scan the whole path of the parabolic region, accurately locates the tension abnormal point, such as the change of the lowest point height of the parabola, and the data collection is more comprehensive.

[0055] Sandwich type anti-tension compensation mechanism: the film pressing plate 35 and the PCB circuit fixing plate 37 form a clamping channel, combined with a plurality of anti-tension lifting assemblies, the anti-tension push plate 39 is locally lifted by the micro-control push rod 38 to make the PCB circuit fixing plate 37 and the film pressing plate 35 bend synchronously, form a compensation curvature opposite to the original parabola, and realize accurate tension neutralization.

[0056] Self-adaptive material protection design: the film pressing column one 214 and the film pressing column two 224 adopt soft material to avoid scratching the film caused by hard contact;

[0057] The plastic strips 36 provide the reset elasticity of the pressing plate 35 to prevent excessive bending damage to the circuit.

[0058] Closed-loop control process: sensor data is fed back to the system in real time, and the reverse tension push-up assembly is controlled to act through algorithm calculation, forming a closed-loop control of "detection-analysis-compensation", to ensure that the tension fluctuation range is controllable.

[0059] Step 1:

[0060] Initial membrane positioning: the PCB circuit after lamination passes through the pressing column one 214 and the pressing column two 224, and finally enters the clamping channel of the pressing plate 35 and the PCB circuit fixed plate 37.

[0061] Step 2:

[0062] Parabolic shape construction: the pneumatic push rod one 211 and the pneumatic push rod two 221 synchronously push the pressing plate one 213 and the pressing plate two 222 to rise, lifting the PCB circuit to a preset height, and the middle section naturally droops to form an open upward parabola.

[0063] The soft outer wall of the pressing column one 214 and the pressing column two 224 clamps the circuit at both ends to avoid slipping.

[0064] Step 3:

[0065] Dynamic tension detection: the servo motor 29 drives the two drive screws 27 to rotate, and the transmission belt 28 drives the sliding seat 25 to reciprocate along the sliding groove 26, and the sensor device 24 scans the parabolic area to collect the lowest point height data. The greater the tension, the lower the lowest point, and the data is transmitted to the system in real time.

[0066] Step 4:

[0067] Reverse tension compensation execution: the system controls the micro-control push rod 38 at the corresponding position to drive the reverse tension push plate 39 to lift, so that the PCB circuit fixed plate 37 bends upward to form a reverse curvature with the pressing plate 35 to neutralize the original parabolic tension; the plastic strip 36 ensures the bending synchronization of the pressing plate 35.

[0068] Step 5:

[0069] Reset and continuous production: after compensation is completed, the micro-control push rod 38 drives the reverse tension push plate 39 to reset, and the plastic strip 36 restores the elasticity to make the pressing plate 35 and the PCB circuit fixed plate 37 tend to be horizontal.

[0070] The electric push rod 33 lifts the pressing plate 35 to release the circuit, and the PCB circuit continues to proceed to the next process, and the cycle is repeated.

[0071] The above describes the embodiments of the present application, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are only illustrative but not restrictive, and the person of ordinary skill in the art can make many forms under the inspiration of the present embodiments, which all belong to the protection of the present embodiments.

Claims

1. A CCD web assembly machine characterized by, The utility model relates to a kind of PCB line tension compensation device, including: The discharge end of the assembly machine body (11) is provided with parabolic generating mechanism (2), for detecting the tension of PCB finished product transparent film; The parabolic generating mechanism (2) includes first lift head (21) and second lift head (22) sequentially arranged along PCB line discharge path, and the first lift head (21) and the second lift head (22) form a parabolic forming area, and the PCB line forms an open upward natural parabolic shape by the coordinated push-lift action of the two lift heads when passing through the area, and a movable sensor (24) is arranged below the parabolic shape. The anti-tension compensation assembly includes a film pressing plate (35) and a PCB line fixing plate (37), the PCB line sequentially passes through the clamping channel formed by the film pressing plate (35) and the PCB line fixing plate (37), and the bottom of the PCB line fixing plate (37) is provided with a plurality of anti-tension push-lift assemblies. The anti-tension compensation assembly further includes a film passing box (31), and a fixed frame (32) is fixedly arranged on the film passing box (31), and an electric push rod (33) is fixedly arranged at the center position of the fixed frame (32). The upper wall of the film pressing plate (35) is fixedly provided with a plurality of plastic strips (36) and a pressure bearing frame (34), the pressure bearing frame (34) is H-shaped, the center position of the pressure bearing frame (34) is fixedly connected with the telescopic arm of the electric push rod (33), the height of the pressure bearing frame (34) is greater than the total height of the film pressing plate (35) and the PCB line fixing plate (37), and the plurality of plastic strips (36) are transverse and in the same direction as the PCB line. The anti-tension push-lift assembly includes an anti-tension push plate (39), a micro-control push rod (38) is fixedly arranged below the anti-tension push plate (39), the plurality of anti-tension push plates (39) are parallel to each other and perpendicular to the running direction of the PCB line, and the wires of the plurality of micro-control push rods (38) are connected with the system. The tension data of the PCB line after film covering is collected in real time by the sensor (24), and the anti-tension push-lift assembly is driven to bend and deform synchronously with the PCB line fixing plate (37) and the film pressing plate (35) after system algorithm processing, realizing sandwich type compression anti-tension compensation.

2. A machine according to claim 1, wherein, The first lift head (21) includes a pneumatic push rod (211), an extension arm (212), a lift plate (213), and a film pressing column (214), the pneumatic push rod (211) is fixed in the bottom wall near the discharge end of the assembly machine body (11), the lift plate (213) is fixedly arranged on the telescopic arm of the pneumatic push rod (211), and the film pressing column (214) is arranged above the lift plate (213) in parallel.

3. A machine according to claim 2, wherein the drive means comprises a motor and a drive belt. The extension arm one (212) is fixedly arranged at two ends of the film pressing column one (214), and the end of the extension arm one (212) away from the film pressing column one (214) is fixedly connected with the pneumatic push rod one (211), the film pressing plate one (213) is made of hard material, the outer wall of the film pressing column one (214) is made of soft material, the film pressing plate one (213) is a semi-cylindrical shape, and the arc surface faces one side of the film pressing column one (214), and the coated PCB circuit passes through the gap between the film pressing plate one (213) and the film pressing column one (214).

4. The machine of claim 2 wherein, The second film pressing head (22) comprises a pneumatic push rod two (221), a film pressing plate two (222), an extension arm two (223) and a film pressing column two (224), the pneumatic push rod two (221) is fixed on one side of the discharge end of the first film pressing head (21), the pneumatic push rod two (221) is fixedly provided with the film pressing plate two (222) on the telescopic arm, the film pressing plate two (222) is provided with the film pressing column two (224) in parallel above, the film pressing column two (224) is fixedly provided with the extension arm two (223) at two ends, and the end of the extension arm two (223) away from the film pressing column one (214) is fixedly connected with the pneumatic push rod two (221).

5. A machine according to claim 4, wherein the drive means comprises a motor and a drive belt. The film pressing plate two (222) is made of hard material, the outer wall of the film pressing column two (224) is made of soft material, the coated PCB circuit passing through the film pressing plate one (213) and the film pressing column one (214) again passes through the gap between the film pressing plate two (222) and the film pressing column two (224), and finally passes through the film pressing plate (35) and the PCB circuit fixing plate (37).

6. The machine of claim 1 wherein, The space between the first film pressing head (21) and the second film pressing head (22) is fixedly provided with a film passing bottom box (23), the upper surface of the film passing bottom box (23) is provided with a sliding groove (26), the sliding groove (26) is transversely coincident with the transverse center line of the film passing bottom box (23), the sliding groove (26) is slidably provided with a sliding seat (25), and the sliding seat (25) is fixedly provided with a sensor device (24).

7. A machine according to claim 6, wherein the said means for moving the said web material comprises a plurality of rollers. Two driving screws (27) are rotatably arranged in the film passing bottom box (23), and the two driving screws (27) respectively penetrate into the sliding seat (25), the sliding seat (25) is threadedly connected with the driving screw (27), the top ends of the two driving screws (27) are connected through a transmission belt (28), and the driving end of the driving screw (27) is provided with a servo motor (29), and the servo motor (29) is fixedly connected with the film passing bottom box (23).

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