Automatic dust-sticking paper replacing device for PCB (printed circuit board) dust remover

Abstract

The invention discloses an automatic dust-sticking paper replacing device for a PCB dust remover. The automatic dust-sticking paper replacing device comprises a moving unit, a temporary storing and taking cylinder unit, a material guiding unit, a material preparing unit and a feeding unit. The temporary storage and taking cylinder unit is arranged at the upper end of the moving unit and comprises a pair of U-shaped frames used for containing dust sticking paper, and the other side face of the vertical plate is provided with a push-out assembly used for pushing out a paper cylinder in the PCB dust remover. The material guiding unit is arranged on one side of the temporary storing and taking cylinder unit and comprises a material guiding plate and a U-shaped frame used for guiding the dust sticking paper to the upper portion or the lower portion, and the material guiding plate is matched with the long edge of the C-shaped groove. The material preparing unit is arranged on one side of the material guiding unit and comprises a rectangular-ambulatory-plane frame which is obliquely arranged and used for containing multiple sets of dust sticking paper, and a lifting cover is assembled at a lower end opening of the rectangular-ambulatory-plane frame. The feeding unit is arranged at one end of the temporary storing and taking cylinder unit and used for pushing the dust sticking paper placed on the temporary storing and taking cylinder unit into a preset installation position in the PCB dust remover. The dust removal paper can be replaced automatically and quickly, and manpower is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB board surface treatment, and particularly to an automatic dust sticking paper replacement device for a PCB dust removal machine. Background Art

[0002] When a circuit board (PCB) is produced, dust, particles and other pollutants will be generated on its surface. In order to improve the cleanliness of the circuit board in subsequent processes such as soldering, assembly or detection, dust removal operations are required.

[0003] As Figure 10 shown, the currently used PCB dust removal machine 7 includes a maintenance port, on which a maintenance cover 71 is assembled. Inside the PCB dust removal machine 7, there is a PCB conveying mechanism. During dust removal, the PCB is conveyed and passes between two silica gel wheels 75 sleeved outside two second rotating shafts 74 as shown in Figure 11 shown. Inside the PCB dust removal machine 7, there is also a pair of first rotating shafts 72. A sleeve roller 73 is fixed on the outer peripheral side of the first rotating shaft 72. The sleeve roller 73 is the component for sleeving the dust sticking paper. A complete set of dust sticking paper includes a paper tube 8 and a paper roll wound around the outer peripheral side thereof. The position of the first rotating shaft 72 can be automatically adjusted by the PCB dust removal machine 7, so that the outermost paper of the paper roll of the dust sticking paper can remove the pollutants adsorbed on the silica gel wheel 75. And the PCB dust removal machine 7 also has the functions of automatically cutting the paper roll and taking away the waste paper. After the paper roll of the dust sticking paper is used up, as Figure 11 shown, only the paper tube 8 remains at this time. The operator needs to open the maintenance cover 71, take away the paper tube 8, then sleeve a new dust sticking paper on the sleeve roller 73, and then cover the maintenance cover 71. In addition, at one end of the PCB dust removal machine 7 far from the maintenance port, the first rotating shaft 72 and the second rotating shaft 74 are respectively driven by multiple motors. Some PCB dust removal machines 7 also have multiple rotating seats for supporting the first rotating shaft 72 and the second rotating shaft 74 at one end close to the maintenance port, but the rotating seats can be automatically disengaged when the dust sticking paper needs to be replaced. During continuous production, the operator needs to repeat this operation many times every day, consuming a lot of manpower. Summary of the Invention

[0004] In view of the above defects, the present invention provides an automatic dust sticking paper replacement device for a PCB dust removal machine, which can automatically and quickly complete the replacement operation of the dust removal paper, saving manpower.

[0005] In order to achieve the object of the present invention, the following technologies are proposed: An automatic dust sticking paper replacement device for a PCB dust removal machine, comprising: A moving unit for moving the replacement device; The temporary storage cylinder unit is arranged at the upper end of the mobile unit and includes a horizontal plate. A C-shaped groove is opened at the upper end of one side surface of the horizontal plate. Sliders are respectively arranged below both ends of the horizontal plate, and several rollers are arranged at the lower ends of the sliders. A vertical plate is arranged on the upper end surface of the horizontal plate. A pair of U-shaped frames arranged vertically are arranged on one side surface of the vertical plate for placing sticky dust paper. A pushing component for pushing the paper cylinder in the PCB dust removal machine outwards is arranged on the other side surface of the vertical plate; The material guiding unit is arranged on one side of the temporary storage cylinder unit and includes a fourth linear mechanism with an output direction perpendicular to the axis of the paper cylinder. A second rotating motor is arranged at the output end of the fourth linear mechanism. A material guiding plate is arranged at one end of the outer peripheral side of the output shaft of the second rotating motor for guiding the sticky dust paper to the U-shaped frame located above or below. The material guiding plate matches the long side of the C-shaped groove; The stock preparation unit is arranged on one side of the material guiding unit and includes a return-shaped frame which is inclined and used for placing multiple sets of sticky dust paper. A lifting cover is assembled at the lower port of the return-shaped frame; The feeding unit is arranged at one end of the temporary storage cylinder unit and is used for pushing the sticky dust paper placed on the temporary storage cylinder unit into a predetermined installation position in the PCB dust removal machine.

[0006] Furthermore, the pushing component includes a second linear mechanism arranged on the other side surface of the vertical plate and parallel to the axis of the paper cylinder. A third linear mechanism parallel to it is arranged at the sliding end of the second linear mechanism. Two pairs of first rotating motors are arranged at the output end of the third linear mechanism. A rotating plate is arranged at the output end of the first rotating motor. An arc plate matching a part of the arc of the cross-section of the paper cylinder is arranged at one end of the rotating plate.

[0007] Furthermore, the feeding unit includes a pair of sixth linear mechanisms arranged in the vertical direction. A pushing ring is arranged at the output end of the sixth linear mechanism. The inner diameter of the pushing ring is larger than the outer diameter of the sleeve roller of the PCB dust removal machine and smaller than the outer diameter of the paper cylinder. A limiting arc is further arranged at the upper part of one end of the pushing ring. The inner peripheral side of the limiting arc matches the outer peripheral side of the paper roll.

[0008] The beneficial effects of this technical solution are as follows: Through the automatic sticky dust paper replacement device of the present application, the used paper cylinder can be automatically removed and a new dust removal paper can be automatically loaded, which can reduce a large amount of manual operations, improve the automation level, and save labor consumption. Description of the Drawings

[0009] Figure 1 The three-dimensional view of the mobile unit, temporary storage cylinder unit, material guiding unit, stock preparation unit, and feeding unit in the embodiment of the present application is shown.

[0010] Figure 2 The partial three-dimensional view of the mobile unit in the embodiment of the present application is shown.

[0011] Figure 3 The three-dimensional view of the overall temporary storage cylinder unit, material guiding unit, stock preparation unit, and feeding unit, as well as the partial mobile unit in the embodiment of the present application is shown.

[0012] Figure 4 Shows a perspective view of the temporary storage cylinder unit according to an embodiment of the present application.

[0013] Figure 5 Shows a partial perspective view of the temporary storage cylinder unit according to an embodiment of the present application.

[0014] Figure 6 Shows a perspective view of the material guiding unit according to an embodiment of the present application.

[0015] Figure 7 Shows a perspective view of the stock preparation unit according to an embodiment of the present application.

[0016] Figure 8 Shows an exploded view of the stock preparation unit according to an embodiment of the present application.

[0017] Figure 9 Shows a perspective view of the loading unit according to an embodiment of the present application.

[0018] Figure 10 Shows a schematic diagram of the assembly position of the open - cover positioning unit according to the present application on the PCB dust removal machine.

[0019] Figure 11 Shows a schematic diagram of some components inside the PCB dust removal machine in the background art of the present application. Detailed implementation manners

[0020] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] As Figures 1 to 10 shown, an automatic dust - sticking paper replacement device for a PCB dust removal machine includes a moving unit 1, a temporary storage cylinder unit 2, a material guiding unit 3, a stock preparation unit 4, a loading unit 5, and an open - cover positioning unit 6.

[0022] The moving unit 1 includes a vehicle plate 11. A plurality of universal wheels 12 are provided at the lower end of the vehicle plate 11. A support platform 13 is provided at the upper end of the vehicle plate 11. A positioning block 131 is provided on one end face of the support platform 13. A pair of inclined blocks 14 are provided on one side of the upper end face of the support platform 13. A grip rod 15 is provided between the upper parts of the opposite faces of the two inclined blocks 14. A placement groove 16 is provided on the other side of the upper end face of the support platform 13. During operation, a waste cylinder frame 161 is provided in the placement groove 16. By providing the waste cylinder frame 161, it is convenient to collect the used paper cylinder 8. Guide grooves 17 are respectively provided at both ends of the placement groove 16. A first linear mechanism 18 is further provided on the upper end face of the support platform 13, and a pull plate 19 is provided at its output end. One end of the pull plate 19 is located outside one of the guide grooves 17.

[0023] The temporary storage cylinder unit 2 is provided at the upper end of the mobile unit 1 and includes a horizontal plate 21. At the upper end of one side surface of the horizontal plate 21, a C-shaped groove 211 is opened. The C-shape mentioned here refers to the shape that is C-shaped when viewed from above. At both ends of the horizontal plate 21, inverted L-shaped plates 212 are respectively provided. At the lower end of the vertical part of the inverted L-shaped plate 212, a slider 213 is provided. At the lower end of the slider 213, a plurality of rollers 214 slidably engaged with the guide groove 17 are provided. At one end of the slider 213, a connecting plate 215 is provided. At one end of the connecting plate 215, an outer plate 22 is provided. At one end of the outer plate 22 facing the output shaft direction of the first linear mechanism 18, a convex plate 221 further extends, which is used for the pull plate 19 to contact and slide the slider 213. On the upper end surface of the horizontal plate 21, a vertical plate 23 is provided. On one side surface of the vertical plate 23, a pair of U-shaped frames 231 arranged up and down are provided. The top surface of the U-shaped frame 231 is opened with an arc groove matching the outer peripheral side of the paper roll 9 of the dust sticking paper. When loading the dust sticking paper, when two dust sticking papers are placed on the U-shaped frame 231, the paper tubes 8 of each dust sticking paper are respectively coaxial with the first rotating shafts 72 of the PCB dust removal machine 7. At one end of the U-shaped frame 231 located below, a first guiding inclined plate 232 further extends. On the other side surface of the vertical plate 23, a second linear mechanism 24 parallel to the axis of the paper tube 8 is provided. Its sliding end is provided with a third linear mechanism 25 parallel to it. At the output end of the third linear mechanism 25, a mounting plate 251 is provided. On one side surface of the mounting plate 251, two pairs of first rotating motors 26 are provided. The output end of the first rotating motor 26 is provided with a rotating plate 261. At one end of the rotating plate 261, an arc plate 27 matching a part of the arc of the cross-section of the paper tube 8 is provided, which is used to push the paper tube 8 in the PCB dust removal machine 7 outwards. On the other side surface of the horizontal plate 21, a convex rod 28 is further provided. At one end of the convex rod 28, a second guiding inclined plate 29 is provided, which is used to guide the paper tube 8 pushed out by the arc plate 27 into the waste cylinder frame 161 to prevent the paper tube 8 from falling between the PCB dust removal machine 7 and the temporary storage cylinder unit 2.

[0024] The material guiding unit 3 is provided on one side of the temporary storage cylinder unit 2 and includes a fourth linear mechanism 31 with an output direction perpendicular to the axis of the paper tube 8. Its bottom end is provided with a first support 311 fixed on the support table 13. The output end of the fourth linear mechanism 31 is provided with a supporting block 32. On its upper end, a machine frame 321 and a rotating seat 322 are provided. On the machine frame 321, a second rotating motor 33 is provided. The output shaft of the second rotating motor 33 is rotatably fitted in the rotating seat 322. A swinging plate 34 is sleeved on the outer peripheral side of the output shaft of the second rotating motor 33. At one end of the swinging plate 34, a material guiding plate 35 is provided. On both sides of the material guiding plate 35, limiting plates 36 are respectively provided. The distance between the opposite surfaces of the two limiting plates 36 is 5 mm larger than the length of the paper tube 8. The material guiding plate 35 is used to guide the dust sticking paper to the U-shaped frame 231 located above or below. The C-shaped structure formed by connecting the material guiding plate 35 and the two limiting plates 36 matches the C-shaped groove 211, which is used to push the horizontal plate 21 to move when the material guiding plate 35 is rotated to the vertical state.

[0025] The stock preparation unit 4 is arranged on one side of the material guiding unit 3 and includes a U-shaped frame 41 which is inclined and used for placing multiple sets of sticky dust papers. A number of second brackets 411 fixed on the support table 13 are provided under the bottom surface of the U-shaped frame 41. A flip cover 43 is assembled at the upper port of the U-shaped frame 41. Specifically, an extension ring 42 is provided at the top of the upper port of the U-shaped frame 41, a convex part 431 is provided at the upper end of the flip cover 43, and rotating rods 432 which are rotatably matched inside the extension ring 42 are respectively provided at both ends of the convex part 431. A lifting cover 46 is assembled at the lower port of the U-shaped frame 41. Specifically, a third bracket 44 is provided on the top surface of the U-shaped frame 41, a fifth linear mechanism 45 is provided on one side surface of the third bracket 44, a side plate 451 is provided at its output end, the lifting cover 46 is arranged at one end of the side plate 451, and the lower port of the U-shaped frame 41 is located above one end of the material guiding plate 35. The arrangements of the flip cover 43 and the lifting cover 46 can enclose the U-shaped frame 41, so that the sticky dust papers prepared in the U-shaped frame 41 will not be contaminated before being loaded into the PCB dust removal machine 7.

[0026] The feeding unit 5 is arranged at one end of the temporary storage cylinder unit 2 and includes a pair of sixth linear mechanisms 51 arranged along the vertical direction. A first inverted L-shaped frame 56 is provided on one side of the lower sixth linear mechanism 51, a second inverted L-shaped frame 57 is provided on one side of the upper sixth linear mechanism 51. The vertical parts of the first inverted L-shaped frame 56 and the second inverted L-shaped frame 57 are both fixed on the support table 13. A push plate 52 is provided at the output end of the sixth linear mechanism 51. A pair of fixing plates 53 are provided on one side surface of the push plate 52. A push ring 54 is provided at one end of the fixing plate 53. The inner diameter of the push ring 54 is larger than the outer diameter of the sleeve roller 73 of the PCB dust removal machine 7 and smaller than the outer diameter of the paper cylinder 8. The push ring 54 is used to push the sticky dust paper to the installation position inside the PCB dust removal machine 7. A limiting arc 55 is further provided at the upper part of one end of the push ring 54. The inner peripheral side of the limiting arc 55 matches the outer side surface of the paper roll 9 and is used to prevent the sticky dust paper from falling when it is between the temporary storage cylinder unit 2 and the PCB dust removal machine 7 and has not contacted the sleeve roller 73.

[0027] The open cover positioning unit 6 is fixed at one end of the PCB dust removal machine 7 and includes a fixing frame 61. A third rotary motor 62 is provided on the fixing frame 61, and its output shaft is coaxial with the rotary shaft of the maintenance cover 71 of the PCB dust removal machine 7. A rocking rod 63 is provided at one end of the output shaft of the third rotary motor 62. A seventh linear mechanism 64 is provided at the lower end of the rocking rod 63, and an insertion plate 65 which is used to penetrate between the outer side surface of the maintenance cover 71 and its handle is provided at its output end. The open cover positioning unit 6 further includes a C-shaped block 66, and a positioning groove 67 which matches the positioning block 131 is provided on one end surface of the C-shaped block 66.

[0028] Through the open cover positioning unit 6, the automation degree of the replacement device can be further improved, automatic open cover can be realized, and the positioning of the main body part of the replacement device can be facilitated, thus improving the accuracy of sticky dust paper replacement.

[0029] In this embodiment, the first linear mechanism 18, the third linear mechanism 25, the fourth linear mechanism 31, the fifth linear mechanism 45, the sixth linear mechanism 51, and the seventh linear mechanism 64 all adopt single-axis linear cylinders, and the second linear mechanism 24 adopts a rodless linear cylinder.

[0030] Working mode: First, the moving unit 1 moves the moving unit 1, the temporary storage cylinder unit 2, the material guiding unit 3, the stock preparation unit 4, and the feeding unit 5, that is, the main body part of the sticky dust paper automatic replacement device, to one end of the PCB dust removal machine 7. Specifically, the positioning block 131 is abutted against the positioning groove 67 so that the main body part is positioned more precisely.

[0031] Then, prepare some sticky dust papers in the loop frame 41 in advance. For example, put all the sticky dust papers to be used on the same day into the loop frame 41.

[0032] Then, the insertion plate 65 is inserted between the outer side surface of the inspection cover 71 and its handle through the seventh linear mechanism 64, and then the inspection cover 71 is rotated and opened by the third rotating motor 62.

[0033] Next, start the automatic replacement operation of the sticky dust paper. Of course, at this time, the PCB dust removal machine 7 has entered the state of replacing the sticky dust paper, and the blocking outside the first rotating shaft 72 and the second rotating shaft 74 has been removed. The following is a specific description.

[0034] First, the third linear mechanism 25 is moved close to the PCB dust removal machine 7 through the second linear mechanism 24, and then the mounting plate 251 is pushed into the PCB dust removal machine 7 through the third linear mechanism 25. Then, the first rotating motor 26 rotates each arc plate 27 to an inclined state first and then to a horizontal state, and the paper cylinders 8 are pulled out of the PCB dust removal machine 7 from one end. Then, the two paper cylinders 8 slide into the waste cylinder frame 161 through the second guiding inclined plate 29.

[0035] Then, the two dust removal papers prepared in the stock preparation unit 4 are prepared to the temporary storage cylinder unit 2 through the material guiding unit 3. Specifically: First, place the dust removal paper on the upper U-shaped frame 231. The angle of the material guiding plate 35 is as Figure 3 shown. Then, the lifting cover 46 is opened through the fifth linear mechanism 45 to release a set of dust removal papers, and then the lifting cover 46 is closed. The dust removal papers fall into the upper U-shaped frame 231. Similarly, the material guiding plate 35 is rotated by the second rotating motor 33, and then the above operation is repeated to place the dust removal papers on the lower U-shaped frame 231 as well.

[0036] Then continue to rotate the material guide plate 35 through the second rotating motor 33 to make it vertical, then push the cross plate 21 to the end through the fourth linear mechanism 31, and then control the push ring 54 to push the dust removal paper through the sixth linear mechanism 51. Since the distance between the main body part of the automatic dust removal paper replacement device and the PCB dust removal machine 7 is not specifically described above, if the distance is relatively far, the dust removal paper can also be limited to prevent falling by rotating the arc plate 27 in the reverse direction to the horizontal state on the other side. After the dust removal paper is pushed to the predetermined position on the sleeve roller 73, the feeding unit 5 is removed.

[0037] And so on, every predetermined time, for example, 1 hour, repeat the above automatic replacement operation of the dust removal paper.

[0038] The above are only some embodiments listed in this application and do not limit this application.

Claims

1. An automatic sticky paper replacement device for a PCB dust removal machine, characterized in that: include: A moving unit (1) for moving the replacement device; The temporary storage and retrieval cylinder unit (2) is arranged at the upper end of the mobile unit (1), and comprises a horizontal plate (21), the upper end of one side of which is provided with a C-shaped groove (211), sliders (213) are respectively provided below the two ends of the horizontal plate (21), and the lower ends of the sliders (213) are provided with a plurality of rollers (214), the upper end surface of the horizontal plate (21) is provided with a vertical plate (23), one side of which is provided with a pair of U-shaped frames (231) arranged vertically and used for placing dust sticky paper, and the other side of the vertical plate (23) is provided with a pushing component for pushing out the paper cylinder (8) in the PCB dust removal machine (7); The material guide unit (3) is arranged on one side of the temporary storage and retrieval drum unit (2), and comprises a fourth linear mechanism (31) whose output direction is perpendicular to the axis of the paper drum (8), and a second rotary motor (33) at its output end. A material guide plate (35) is arranged at one end of the outer peripheral side of the output shaft of the second rotary motor (33) for guiding the dust-sticking paper to the U-shaped frame (231) located above or below, and the material guide plate (35) matches the long side of the C-shaped groove (211); A material preparation unit (4) is arranged on one side of the material guide unit (3), and comprises a circular frame (41) which is arranged at an angle and is used to place a plurality of sets of dust-sticking papers, and a lower end of the circular frame (41) is equipped with a lifting cover (46); The loading unit (5) is arranged at one end of the temporary storage and retrieval cylinder unit (2) and is used to push the dust sticking paper placed on the temporary storage and retrieval cylinder unit (2) into a predetermined installation position in the PCB dust removal machine (7).

2. The automatic sticky paper replacement device for a PCB dust removal machine according to claim 1 is characterized in that: The mobile unit (1) comprises a vehicle plate (11), a plurality of universal wheels (12) are provided at the lower end of the vehicle plate (11), a support platform (13) is provided at the upper end of the vehicle plate (11), a pair of inclined blocks (14) are provided on one side of the upper end surface of the support platform (13), a gripping rod (15) is provided between the upper parts of the opposing surfaces of the two inclined blocks (14), a guide groove (17) is provided on the other side of the upper end surface of the support platform (13), and a first linear mechanism (18) is also provided on the upper end surface of the support platform (13), the output of which is A pull plate (19) is provided at one end of the pull plate (19), one end of which is located outside a guide groove (17), a roller (214) is slidably fitted in the guide groove (17), a connecting plate (215) is provided at one end of the slider (213), an outer plate (22) is provided at one end of the connecting plate (215), and a convex plate (221) is extended from one end of the outer plate (22) in the direction of the output shaft of the first linear mechanism (18), which is used for the pull plate (19) to contact and make the slider (213) slide.

3. The automatic sticky paper replacement device for a PCB dust remover according to claim 2 is characterized in that: A placement groove (16) is provided on the other side of the upper end surface of the support platform (13). When in operation, a waste tube frame (161) is provided in the placement groove (16). Two guide grooves (17) are respectively provided at both ends of the placement groove (16). A protruding rod (28) is further provided on the other side of the horizontal plate (21). A second guiding inclined plate (29) is provided at one end of the protruding rod (28) for guiding the paper tube (8) pushed out by the arc plate (27) into the waste tube frame (161).

4. The automatic sticky paper replacement device for a PCB dust removal machine according to claim 1 is characterized in that: The top surface of the U-shaped frame (231) is an arc surface, which matches the outer peripheral side surface of the paper roll (9) of the sticky paper. When the sticky paper is loaded, when two sticky papers are placed on the U-shaped frame (231), the paper tubes (8) of each sticky paper are coaxial with each first rotating shaft (72) of the PCB dust removal machine (7), and a first guide inclined plate (232) is also extended from one end of the U-shaped frame (231) located at the bottom.

5. The automatic sticky paper replacement device for a PCB dust removal machine according to claim 1, characterized in that: The ejection assembly comprises a second linear mechanism (24) arranged on the other side of the vertical plate (23), the axis of the second linear mechanism (24) being parallel to the axis of the paper tube (8), a third linear mechanism (25) being parallel to the second linear mechanism (24) being arranged at a sliding end thereof, two pairs of first rotating motors (26) being arranged at an output end thereof, a rotating plate (261) being arranged at an output end thereof, and an arc plate (27) matching a partial arc of a cross section of the paper tube (8) being arranged at one end thereof.

6. The automatic sticky paper replacement device for a PCB dust removal machine according to claim 1 is characterized in that: Limiting plates (36) are respectively provided on both sides of the material guide plate (35); a C-shaped structure formed by connecting the material guide plate (35) and the two limiting plates (36) matches the C-shaped groove (211) and is used to push the horizontal plate (21) to move when the material guide plate (35) is rotated to a vertical state.

7. The automatic sticky paper replacement device for a PCB dust removal machine according to claim 1, characterized in that: The upper end of the circular frame (41) is equipped with a flip cover (43).

8. The automatic sticky paper replacement device for a PCB dust removal machine according to claim 1, characterized in that: A third bracket (44) is provided on the top surface of the circular frame (41), a fifth linear mechanism (45) is provided on a side surface of the third bracket (44), an output end of which is provided with a side plate (451), a lifting cover (46) is provided at one end of the side plate (451), and a lower port of the circular frame (41) is located above one end of the material guide plate (35).

9. The automatic sticky paper replacement device for a PCB dust removal machine according to claim 1, characterized in that: The feeding unit (5) comprises a pair of sixth linear mechanisms (51) arranged in a vertical direction. A push ring (54) is provided at the output end of the sixth linear mechanism (51). The inner diameter of the push ring (54) is larger than the outer diameter of the sleeve roller (73) of the PCB dust remover (7) and smaller than the outer diameter of the paper roll (8). A limit arc (55) is also provided at the upper portion of one end of the push ring (54). The inner circumference of the limit arc (55) matches the outer circumference of the paper roll (9).

Images