JPS6320672B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is characterized in that a large number of pin insertion holes are bored in the substrate.
When using ultra-thin sheets of approximately 0.2 to 1.0 mm to make PC boards flexible, a double-sided sander for flexible sheets is used to remove burrs from perforations on both sides of the sheet by polishing. The conveyance surface of the first conveyor belt provided with many ventilation holes and the conveyance surface of the second conveyance belt provided with many ventilation holes are arranged vertically on the same level and are connected almost horizontally. , a first contact plate provided with a plurality of suction holes through which the ventilation holes of the first conveyor belt coincide with and pass through is fixed to the surface opposite to the conveyance surface of the first conveyor belt; A second contact plate having a plurality of suction holes through which the ventilation holes of the second conveyor belt coincide with each other is fixed on the opposite surface of the first contact plate, and A first group of suction boxes arranged in tandem on one side is attached, and a second group of suction boxes arranged in tandem in the conveying direction is attached on the opposite side of the contact passing surface of the second conveyor belt of the second contact plate. Attached to each of the conveying surfaces of the first and second conveying belts, several first sheets are attached to alternately touch and polish both sides of the flexible sheet that is sucked into the ventilation holes of each conveying surface and conveyed in one direction. A group of polishing wheels and a group of second polishing wheels are arranged so that the distance between them and each conveying surface can be freely adjusted, and flexible sheets to be polished are placed in front and behind each polishing wheel. The present invention is characterized in that a pressing plate is provided to press each conveying surface of the conveying belt.

In wide belt sanders, etc., the conveyor belt that conveys the grinding and abrasive material is provided with many ventilation holes for vacuum suction, and a suction box is placed on the opposite side of the conveyor belt in correspondence with the belt sanding part of the sanding belt. The one with the arranged structure is
It is known from Publication No. 3117. however,
It is not possible to temporarily polish both sides of a flexible sheet with a belt sander machine having only one conveyor belt, and a dedicated polishing machine adapted to the properties of the flexible sheet is required. Furthermore, since both the front and back surfaces are polished several times, even if two machines can be placed one above the other, it is not possible to modify the structure to connect several machines at a time.

The object of the present invention is to provide a polishing machine which is exclusively used for polishing several times each side of a flexible thin sheet, which is a new material for polishing.
Below, preferred embodiments of the present invention will be described.

FIG. 1 is a side view of this embodiment, in which a first conveyor belt 4 is stretched around a tension/driven roll 2 and a drive roll 3 at the front part of the machine frame 1 (on the left side of the figure).
A second conveyor belt 8 is stretched around a driven roll 6 and a drive roll 7 at the rear of the machine frame 1 (on the right side in the figure). The first conveyor belt 4 has its upper running surface as a conveying surface 4a, and the second conveyor belt 8 has its lower running surface as a conveying surface 8a. In the length direction of 1, the conveyance surface 4a,
A delivery belt 12 is provided, which is arranged and connected to each other so that the belts 8a are on the same level, and is stretched over a driven roll 10 and a drive roll 11 on the lower surface of the right end of the second conveyor belt 8. The first and second conveyor belts 4 and 8 and the delivery belt 12 are connected to a chain wheel 5 on the axis of the drive roll 3 and a chain 17 that is stretched around a chain wheel 14 driven by a deceleration motor _M1 via a chain 13. , drive roll 7
The wheels are engaged with the chain wheels 9 of the shafts of the wheels 9 and 9 to run at the same speed and in the same direction. Further, the chain 18 is hooked onto the chain foil 15 of the drive roll 11 of the delivery belt 12, and the belt 12 is caused to run at high speed. Each belt 4,
Reference numerals 8 and 12 denote small-diameter ventilation holes, which have the same width as the flexible sheet a to be polished, and are arranged at regular intervals in the length direction and width direction in the first conveyor belt 4 and the second conveyor belt 8, respectively. 16 (Figures 4 and 5), 16a (Figure 7)
form.

The above-mentioned ventilation holes 16 or 16a sequentially match and pass through suction holes on the opposite side (inner surface) of the conveying surface 4a of the first conveying belt 4 and the opposite side (inner surface) of the conveying surface 8a of the second conveying belt 8 A first contact plate 19 and a second contact plate 19 formed with 20 and 20a, respectively.
a are fixedly provided, and three contact plates 19, 19a are arranged in tandem at approximately constant intervals on the opposite surface of each contact plate 19, 19a where the first conveyor belt 4 and the second conveyor belt 8 run in contact with each other. A group of first vacuum suction boxes 21 and second vacuum boxes 21a is provided, and piping of a vacuum pump (not shown) is connected to each of the boxes 21, 21a. In addition, several first and second polishing foils are provided on the conveying surface 4a of the first conveying belt 4 and the conveying surface 8a of the second conveying belt 8 to alternately contact and polish the front and back surfaces of the flexible ultra-thin sheet a. 31, 31a
Place a group of

The first contact plate 19 provided with a group of first vacuum suction boxes 21 and the second contact plate 19a provided with a group of second vacuum suction boxes 21a are shown in FIGS. 2 and 3 and 6 and 7. The specific structure of each is the same except that the top and bottom positions are reversed, so
4 and 6, which show only the first contact plate 19, the first contact plate 19 has a mounting piece 22 provided in a protruding manner, and a bolt protruding from a support piece 24 provided on the machine frame 1. The first contact plate 19 and the second contact plate 19 are inserted into the spring 26 and wrapped around the bolt 25.
a. A nut 27 is screwed onto the bolt 25 to provide elastic support and adjust the elasticity of the spring 26.

The first polishing foil 31 and the second polishing foil 31a both slide in the vertical direction to freely adjust the contact pressure against the flexible sheet a, and are structurally the same. To explain only the wheel 31, as shown in FIG. The adjustment screw 35, which is rotated by the handle 36, is brought into contact with the handle 36 and can be moved up and down.
A chain wheel 37 is fixed to the shaft 32 and driven via a chain 38 by a motor _M2 installed on the machine frame 1. The motor M ₂ is configured such that the motor casing base is appropriately floated from the installation base 39.
When the movable bearing 34 and the first polishing wheel 31 are adjusted to the upper position by the adjustment screw 35, the motor _M2 also rises in synchronism to prevent the chain 38 from being overstrained. The second polishing foil 31a is attached to the chain 38.
The same applies to motor _M3 driven via a.

In front and behind the first and second polishing foils 31 and 31a, there are presser plates 41 and 4 that press the flexible sheet a against the respective conveyance surfaces 4a and 8a of the first and second conveyor belts.
1a is provided. FIG. 9 shows the holding plates 41, and as shown in FIG. The first contact plate 19 and the second contact plate 19a are elastically supported by a spring 45, and a nut 46 is screwed onto each bolt 44, and the mounting structure is the same for both the first contact plate 19 and the second contact plate 19a. (See FIGS. 6 and 7) Others 47, 47a, and 48 are small-diameter presser rolls that correspond to the first and second conveyor belts 4 and 8 and the delivery belt 12. Reference numerals 51 and 52 are guide plates disposed opposite to each other from above and below with a slight difference between the first and second conveyor belts 4 and 8.
These are the contact plates 19, 19a and the holding plates 41, 4.
It is supported by the machine frame 1 using the same means as 1a.

In this embodiment, the adjustment screw 35 (second polishing foil 3
1a, the first and second abrasive wheels 31, 3 are adjusted by adjusting screws 35a-35a (not shown).
The contact pressure on the flexible ultra-thin sheet a to be polished conveyed by the first conveyor belt 4 and the second conveyor belt 8 of 1a is adjusted, and the contact pressure is adjusted faster than the belts 4 and 8 by the motors M ₂ and M ₃ . Rotate at speed.
(When the sheet a to be polished is not being fed, it is necessary to polish the first and second conveyor belts 4 and 8 using the first and second polishing foils 31 and 31a to prevent wear. (The operation for that purpose is outside the scope of the present invention.) After the above adjustment, the flexible ultra-thin sheet to be polished is removed from a feeder device (not shown) or a hole punching device connected to the left side of the machine frame 1. A is continuously fed out onto the conveying surface 4a of the first conveying belt 4, and the presser plate 4
1 while pressing the first contact plate 19 against the conveyance surface 4a.
Each time the ventilation hole 16 of the first conveyor belt 4 passes through the suction hole 20 of the sheet a, the lower surface of the sheet a is sucked by the negative pressure of the vacuum suction box 21, and the upper surface of the sheet a is polished by the first polishing foil 31. The first vacuum suction box 21 and the first polishing foil 31 are on the conveying surface 4a.
Since several of them are arranged in groups in the traveling direction of the first polishing foil 31, the suction and polishing described above are repeated, and the polishing performance of each of the first polishing foils 31 is adjusted so that the groups of first polishing foils 31 are sequentially subjected to rough polishing to finish polishing. Polishing can be improved by using different materials.

When the above-mentioned upper surface polishing is completed, the sheet a is transported with its upper surface in contact with the transport surface 8a of the second transport belt 8,
Each time the ventilation hole 16a of the conveying surface 8a passes the lower surface of the suction hole 20a of the second contact plate 19a while being pressed against the conveying surface 8a by the holding plate 41a, the negative pressure of the vacuum suction box 21a causes the conveying surface 8a and sheet a to is suctioned, and the bottom surface of sheet a is polished by polishing foil 3.
Polish by 1a. This lower surface polishing is similar to the above-mentioned upper surface polishing, and it is equally advantageous to perform rough polishing and finish polishing sequentially.

The sheet a whose upper and lower surfaces have been ground alternately as described above is transferred to the delivery belt 12 and sent out.

As clarified from the above description, the present invention is arranged so that the conveying surfaces of the first conveying belt and the second conveying belt, which have a large number of ventilation holes, are on the same level, are arranged vertically, and are oriented almost horizontally. The conveying surfaces are, for example, the lower surface on one conveyor belt and the upper surface on the other conveyor belt, so that both sides of the flexible sheet are alternately represented by each conveyor surface. Polishing can be performed using the first and second groups of polishing foils for each conveyor belt, and while both sides of the flexible sheet are pressed against the conveyor surfaces of the first and second conveyor belts by a presser plate, the upper surface is temporarily adsorbed. The sheet is ground by a group of abrasive foils alternately so that it does not fall even when the sheet is being removed. At that time, the sheet and the conveying surface of the conveyor belt are suctioned by a group of suction boxes on the opposite side of the group of abrasive foils, and This is to prevent the abrasive wheels from being agitated by the rotation of the polishing foils, and since the first and second contact plates to which the groups of suction boxes are fixed are closed except for the suction holes, the first and second conveyor belts, The two conveyor belts and the flexible sheet to be polished contact each contact plate through the respective contact surfaces of the first and second conveyor belts without losing flatness and causing flexure. For this reason, it has the advantage of being able to polish both sides of an extremely thin flexible sheet several times in a good and efficient manner. This has the effect of simplifying the arrangement and downsizing the double-sided sanding machine.

[Brief explanation of the drawing]

The attached drawings show one embodiment of the present invention, in which FIG. 1 is a side view, FIGS. 2 and 3 are side views of the first conveyor belt 4 and the second conveyor belt 8, and FIG. 4 is a partially cutaway view of a part. A plan view, FIG. 5 is a cut side view of a part of the polishing foil 31, FIG. 6 is a front view cut along the line AA in FIG.
Figure 7 is a front view cut along the line B-B of Figure 3, Figure 8 is a partial side view, Figure 9 is a partial plan view, and Figure 10 is a front view cut along the line C-C of Figure 9. be. 4...First conveyance belt, 4a...Conveyance surface, 8...
...Second conveyance belt, 8a...Conveyance surface, 16, 16
a... Ventilation hole, 19, 19a... First and second contact plates, 20, 20a... Suction hole, 21, 21a...
First and second vacuum suction boxes, 31, 31a...
First and second groups of polishing foils, 41, 41a...presser plate, _M1 , _M2 , _M3 ...motor.

Claims (1)

[Claims] 1. The conveying surface of the first conveying belt provided with many ventilation holes and the conveying surface of the second conveying belt provided with many ventilation holes are arranged vertically on the same level and are connected almost horizontally. A first contact plate provided with a plurality of suction holes through which the ventilation holes of the first conveyor belt match and pass through is fixed to the surface opposite to the conveyor surface of the second conveyor belt, and A second contact plate having a plurality of suction holes through which the ventilation holes of the second conveyor belt match and pass through is fixed on the side surface, and a second contact plate is fixed on the side surface opposite to the contact passage surface of the first conveyor belt of the first contact plate. Attaching a group of first suction boxes in which several suction boxes are arranged in tandem, and attaching a group of second suction boxes in which several suction boxes are arranged in tandem in the conveying direction on the opposite side of the second contact plate from the contact passing surface of the second conveyor belt; Several first polishing wheels are provided on each conveyance surface of the first and second conveyance belts to alternately contact and polish both sides of the flexible sheet that is sucked into the ventilation holes of each conveyance surface and conveyed in one direction. A group of abrasive wheels and a group of second abrasive wheels are arranged such that the distance between them and each conveyor surface can be freely adjusted, and a flexible sheet to be polished is placed in front and behind each abrasive wheel on each of the first and second conveyor belts. A double-sided sanding machine for flexible sheets, characterized by a press plate that presses down on the conveying surface.