JP3240359B2 - Spraying device for powder on sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for dispersing powder on a sheet-like material provided in a step of transporting a green sheet or the like forming an alumina substrate for mounting electronic components as a sheet-like material.

[0002]

2. Description of the Related Art Generally, in a process of manufacturing an alumina substrate for mounting electronic components from a green sheet, a continuous strip-shaped green sheet is obtained, and then slits or V-grooves are divided into one for mounting electronic components. Is formed on a predetermined sheet surface, and the green sheet is divided into several sheets for mounting electronic components, and a plurality of sheets are stacked on one another and sent to the next firing step.

As shown in FIGS. 7 and 8, a green sheet stacking and conveying device includes a punching mechanism 1 and a shooter 2.
A belt conveyor 3 for receiving green sheets sequentially fed through the belt conveyor, upper and lower brush roll groups 4 for removing punched debris and the like of the green sheets sent between the rolls through the belt conveyor 3, and are stacked in a later step In order to prevent sticking of the green sheet, a powder dispersing mechanism 6 for adhering alumina powder to each sheet surface of the green sheet transferred from the brush roll group 4 onto the belt conveyor 5, and a dispersing mechanism for this powder A belt conveyor 7 that receives the green sheet from 6 and conveys it to a post-process;
A stacking mechanism 8 for receiving green sheets from the belt conveyor 7 and dropping the sheets downward; and a pitch feed conveyor 9 for stacking a plurality of green sheets dropped from the stacking mechanism 8 and sending them to the next process. Is used.

Conventionally, the above-mentioned powder dispersing mechanism 6 includes a storage tank 6b having an alumina powder discharge gate 6a at a lower part, and a single tank disposed inside the storage tank 6b to scrape the alumina powder on a roll surface. A moving roll 6c and a high-voltage cable 6d that is stretched in parallel in a direction directly below the rotating roll 6c to scatter the alumina powder on the roll surface by electric discharge.
Are provided.

In the powder dispersing mechanism 6, since the high-voltage cable 6d is located immediately below the rotating roll 6c, the alumina powder adheres to the high-voltage cable 6d. There is a disadvantage that the efficiency is easily lost and the alumina powder cannot be stably removed on the sheet surface of the green sheet.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a method for dispersing powder such as alumina to a sheet-like material which can be scattered effectively by discharging with a high-voltage cable and the powder can be stably dispersed on the sheet surface of the sheet-like material. It is an object to provide a spraying device.

[0007]

According to the present invention, there is provided an apparatus for dispersing powder on a sheet-like material according to the present invention, wherein a storage tank having a powder discharge gate provided at the center of the lower part of the tank by inclined plates extending obliquely downward from both side walls, A pair of rotating rolls arranged in parallel with a distance in a tank immediately above the gate, and the rotating rolls are rotated clockwise and counterclockwise in an upward direction so that the powder is rolled from the inclined plate on the roll surface. In addition to being equipped so that it can be scraped out toward the discharge gate, a high-voltage cable that scatters the powder downward by discharge is stretched in the direction parallel to the rotating roll at the upper part of the interval between the rotating rolls. An umbrella-shaped member that comes into sliding contact with the roll surface of the roll is provided above the high-voltage cable.

[0008]

In the apparatus for spreading powder on a sheet-like material according to the present invention, the powder scraped from the inclined plate toward the discharge gate on the roll surface of the rotating roll is scattered downward by the discharge of the high-voltage cable acting from above. From this, a certain amount of powder can be stably removed on the sheet surface of the sheet-like material, and by providing an umbrella-shaped member whose lower end is in sliding contact with the roll surface of each rotating roll above the high-voltage cable, the powder is removed. By preventing the high voltage cable from adhering on the cable, the discharge of the high voltage cable can be effectively applied to the powder.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 6, an embodiment of the present invention will be described with reference to FIGS. In the step of performing, a continuous alumina green sheet (hereinafter simply referred to as a “green sheet”) in a strip shape is divided into a plurality of sheets as an alumina substrate, and the green sheets are stacked before being stacked one by one. In order to prevent sticking of the powder, an alumina powder is attached and installed as a powder dispersing mechanism for adhering the alumina powder to each sheet surface.

[0010] The sheet stacking / transporting apparatus has, as a basic transporting line, each mechanism having the same arrangement as that shown in FIGS. Here, after obtaining a strip-shaped continuous green sheet, slits and V-grooves necessary to divide the sheet surface of the green sheet into a single alumina substrate are formed, and the green sheet is further converted into an alumina substrate. A plurality of substrates are stacked one upon another by dividing the substrate into a plurality of substrates. In the figure, the same components as those shown in FIGS. 7 and 8 are denoted by the same reference numerals.

In FIGS. 1 and 2, reference numeral 1 denotes a green sheet punching mechanism, 2 denotes a shooter for dropping green sheets punched by a plurality of alumina substrates by the punching mechanism 1 into the next process, and 3 denotes a shooter 2. A plurality of brush rolls arranged one above the other so as to remove punching debris and the like of the green sheets sent from the receiving conveyor 3;
Reference numeral 5 denotes a belt conveyor for receiving green sheets sequentially fed from the brush roll group.

Reference numeral 6 denotes a powder dispersing mechanism for removing the alumina powder on each sheet surface while the green sheet is being conveyed by the belt conveyor 5, and 7 denotes a powder dispersing mechanism.
A belt conveyor 8 receives green sheets sequentially sent from the belt conveyor 8, a stacking mechanism unit that receives the green sheets sequentially sent out from the belt conveyor 7 one by one, and stacks a plurality of the green sheets, 9 is a stacker that stacks a plurality of green sheets. A pitch feed conveyor for sending out to the next process in each mountain unit as a table is shown.

In the sheet conveying device,
As shown in FIG. 3, the powder dispersing mechanism 6 includes a storage tank 61 in which an alumina powder discharge gate 60 is provided at the center of the lower part of the tank by inclined plates 67 and 68 extending obliquely downward from both side walls. A pair of rotating rolls 62 and 63 applied to each roll surface, a high-voltage cable 64 that scatters alumina powder downward by electric discharge, and an umbrella-shaped member whose lower end is in sliding contact with the roll surface of each rotating roll 62 and 63. 65a, 6
5b.

In the construction, a pair of rotating rolls 62, 63
Are arranged in parallel in the tank immediately above the gate at an interval, and are rotated clockwise and counterclockwise in different directions in the upward direction so that the alumina powder is rolled on the inclined plates 67 and 6.
It is equipped so that it can be scraped out from 8 to the discharge gate 60. The high-voltage cable 64 is stretched in the direction parallel to the rotating rolls 62 and 63 above the center within the interval between the rotating rolls 62 and 63, and discharges the alumina powder scraped off from the roll surfaces of the rotating rolls 62 and 63. It is provided as one that scatters downward. The umbrella-shaped members 65a and 65b are leaf springs, and are positioned diagonally below by fixing the upper end to the beam member 66 so that the lower end can be elastically displaced by slidingly contacting the roll surfaces of the rotating rolls 62 and 63. Provided.

In the powder dispersing mechanism 6, the alumina powder is applied to the inclined plates 62, 6 on the roll surfaces of the rotating rolls 62, 63.
3, the alumina powder is scattered downward by the discharge of the high-voltage cable 64 acting from above, so that a certain amount of powder can be stably dislodged on the sheet surface of the green sheet S. . By providing umbrella-shaped members 65a and 65b whose lower end portions are in sliding contact with the roll surfaces of the rotating rolls 62 and 63 above the high-voltage cable 64, it is possible to prevent the alumina powder from adhering onto the high-voltage cable 64. High voltage cable 6 to prevent
4 can effectively act on the alumina powder.

In the powder dispersing mechanism 6, the inclined plates 76 and 68 forming the above-mentioned discharge gate 60 are arranged obliquely below the storage tank 61 as slide plates. The slide plate is mounted such that the plate surface is in contact with the roll surfaces of the rotating rolls 62 and 63 so that the scraping amount of the alumina powder can be adjusted. The storage tank 61 is provided so that alumina powder can be supplied by attaching an opening / closing lid 69 to the upper side.

In the sheet conveying apparatus including the powder dispersing mechanism 6, the green sheet shrinks with time due to natural drying, and slits and V-grooves for division are provided on one side of the sheet surface. Therefore, the green sheet is easily bent and deformed in a certain direction due to the difference in the shrinkage ratio between the sheet surface side provided with the slits and the V-grooves and the other surface side. In order to remove the bending deformation, the receiving conveyor 3 is provided with the following sheet bending correcting mechanism.

As the receiving conveyor 3, there is provided an endless belt 30 which rotates at a constant speed in several lines in parallel. The endless belt 30 is set at a rotational speed that keeps a reversal space back and forth so that a green sheet that is reversed with every other green sheet described later does not overlap with a green sheet that is located behind. ing.

While the green sheet is being conveyed by the endless belt 30, a green sheet reversing means 31 for reversing every other green sheet on the belt surface is provided. The green sheet reversing means 31 includes a substantially L-shaped hook 31a.
1b, the hook 31a is provided to move up and down between the strips of the endless belt 30.

When the green sheet S is turned over as shown in FIG. 4, the hook 31a is moved downward so that the leading end is located below the belt surface of the endless belt 30, and if the green sheet S is hooked at the front edge in the traveling direction. For example, the green sheet S is lifted up from the leading edge so as to be supported on the belt surface. At the same time, since the endless belt 30 continues to rotate at a constant speed, the supporting edge of the green sheet by the upward movement of the hook 31a and the constant speed rotation of the endless belt 30 support the trailing edge of the green sheet in the traveling direction. Is configured as a mechanism for reversing on the belt surface.

The reversal tact can be performed in about 0.8 seconds when the press tact for forming a slit or a V-groove on the green sheet for dividing the alumina substrate is about 0.8 to 1.0 second. Further, the reversing speed can be easily adjusted by adjusting the speed by the driving means 31b of the hook 31a and the driving motor of the endless belt 30, and the positional variation after the reversal can be suppressed to be small.

As means for controlling the driving of the reversing means 31, the presence of the green sheet is detected by the reflected light from the sheet surface, and a drive command is issued to the reversing means 31 for every other detected green sheet. Photo sensor 3
1c is provided on the starting end side of the endless belt 30 from the position where the reversing means 31 is provided.

A green sheet feed interval correcting means 32 is provided at the start end of the endless belt 30 at a predetermined distance from the position where the reversing means 31 is provided. The green sheet feeding interval correction means 32 includes a stopper 32a for locking the green sheet at the front edge in the traveling direction, and the air cylinder or the like is used as a driving means 32b to make the stopper 32a protrude or retract between the strips of the endless belt 30, or move up and down. Equipped to do so.

The green sheet feeding interval correcting means 3
In order to correct the green sheet feeding interval so that the green sheet turned over on the belt surface of the endless belt 30 and the green sheet located on the rear side do not overlap in principle, a predetermined value is set for each green sheet. In this cycle, the stopper 32 may be provided so as to move up and down or move up and down between the strips of the endless belt 30.

Alternatively, a stopper 32 may be provided at every other green sheet conveyed by the endless belt 30 so as to move up and down or move up and down between the strips of the endless belt 30. In this case, as shown in FIG. 5, the initial feed interval by the endless belt 30 must be set to at least half (W / 2) + α of the length W of one green sheet. // 2) While the sheet is conveyed by + α, the green sheet S2 located behind the inverted green sheet S1 is locked by a stopper for a predetermined time,
The green sheet S2 is displaced rearward on the belt surface of the endless belt 30 by about half W / 2 of the length W of one green sheet.

By displacing the green sheet S2, a reversal space equal to or more than one green sheet can be secured behind the inverted green sheet S1, so that the green sheet behind the green sheet S1 is reversed with the reversal of the green sheet S1. Prevents overlapping with S2. However, in this case, the interval at which each green sheet is sent to the next process varies for every two sheets.

In order to make the sending interval constant, as shown in FIG. 6, the initial feeding interval by the endless belt 30 is set to W + α which is equal to or more than the length of one green sheet, and the feeding interval is set to W + α. On the way of transport, the green sheet S2 located behind the inverted green sheet S1
Is locked by a stopper for a predetermined time, thereby displacing the belt surface of the endless belt 30 backward by about W length of one green sheet.

When the green sheet S2 is displaced, a feed interval 2W + α equal to or more than two green sheets is provided behind the inverted green sheet S1, and the green sheet S1 is fed along with the reversal of the green sheet S1. Interval W
Since it is + α, the next step can be sequentially sent out at a predetermined interval.

The green sheets, which are alternately inverted on the belt surface of the endless belt 30, are sent to the belt conveyor 5 via the brush roll group 4. Further, by feeding the powder into the above-described powder dispersing mechanism 6, the alumina powder is removed to the sheet surface of the green sheet in order to prevent mutual sticking by stacking a plurality of sheets in a later step.

The green sheet from which the alumina powder has been removed is sent from the belt conveyor 5 to the stacking mechanism 8 via the belt conveyor 7. The stacking mechanism 8 includes a pair of hangers 80a and 80b that open and close, and when one green sheet is received, the hangers 80a and 80b move apart in the horizontal direction, so that the green sheet is arranged below the pitch. It drops on the belt surface of the feed conveyor 9 and immediately thereafter closes in the original approaching direction.

In order to control the opening operation of the hangers 80a, 80b, a photo sensor 81 similar to that described above is provided above the hangers 80a, 80b. Also,
In order to count the number of stacked green sheets due to the opening and closing movements of the stacking mechanism 8, a green sheet conveyance number counting sensor 82 is provided in the middle of the conveyance of the green sheets by the belt conveyor 7, and is provided on the belt surface of the pitch feed conveyor 9. Is provided with an end limit sensor 83.

When a predetermined number of green sheets are stacked in a pile, the pitch feed conveyor 9 rotates a plurality of stacked green sheets at each pitch by rotating at a pitch P slightly larger than the width of the green sheets. Then, the pitch is rotated so as to feed into the next firing step.

While the green sheets are being conveyed to the pitch feed conveyor 9, each green sheet naturally shrinks and shrinks with time. Along with the shrinkage, slits and V-grooves necessary to divide the alumina substrate for mounting electronic components into a single sheet are provided in advance on a predetermined sheet surface. It is easy to bend and deform so that the shaping surface side is curved upward.

Even if the bending deformation occurs, as described above, the bending direction is reversed by inverting every other sheet on the belt surface of the receiving conveyor 3 (endless belt 30) until the green sheet is fed into the stacking mechanism 8. Since the sheets are alternately conveyed and sequentially stacked on the belt surface of the pitch feed conveyor 9 from the stacking mechanism section 8, the sheets are bent by their own weight during the pitch feed to the next firing step. Can be corrected.

Therefore, in the sheet conveying apparatus for stacking and transporting a sheet-like object, a bending deformation in a specific direction which occurs during the conveyance of the sheet-like object can be corrected very easily when continuously manufacturing an alumina substrate for mounting electronic components. In addition, the sheet stacking / transporting device for correcting the deflection can be efficiently used with a simple mechanism without requiring a significant change, thereby contributing to an improvement in productivity.

In the above-described embodiment, the green sheet used for manufacturing the alumina substrate for mounting electronic components is exemplified as a sheet-like material. However, other than this, a sheet-like material made of a magnetic material or a dielectric material may be used. The same applies to the manufacturing process.

[0037]

As described above, according to the apparatus for spreading powder on a sheet according to the present invention, a certain amount of powder is applied to the sheet in order to prevent sticking of a plurality of stacked green sheets. It can be reliably and reliably removed from the seat surface.

[Brief description of the drawings]

FIG. 1 is a side view showing a sheet conveying apparatus including a powder dispersing apparatus according to the present invention.

FIG. 2 is a plan view showing the sheet-like laminating and conveying device.

FIG. 3 is an explanatory view showing a powder dispersing device according to the present invention.

FIG. 4 is an explanatory view showing the order of operation of sheet reversing means provided in the stacking and conveying apparatus of FIG. 1;

5 is an explanatory diagram showing an example of a case in which intervals are set by a sheet interval correction means provided in the stacking / conveying apparatus of FIG. 1 in order of elapse of time.

6 is an explanatory diagram showing an interval setting of another example and an interval setting of FIG. 5 in order of elapse of time.

FIG. 7 is a side view showing a sheet conveying device according to a conventional example.

FIG. 8 is a plan view showing the stacking / conveying device for the sheet-like material.

[Explanation of symbols]

 60 powder discharge gate 61 powder storage tank 62,63 rotating roll 64 high voltage cable 65a, 65b umbrella-shaped member

Continuation of the front page (56) References JP-A-62-205923 (JP, A) JP-B-46-8114 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05B 5 / 00-5/16 B65G 65/30-65/48

Claims (1)

(57) [Claims] 1. A storage tank in which a powder discharge gate is provided at the center of the lower part of the tank by means of inclined plates extending obliquely downward from both side walls, and a pair of rotating rolls arranged parallel to each other at intervals in a tank immediately above the gate. And the rotating roll is rotated clockwise,
It is equipped so that the powder can be swept counterclockwise upward and the powder can be scraped from the inclined plate toward the discharge gate on the roll surface, and a high-voltage cable that scatters the powder downward by discharge is placed above the rotation roll. And a umbrella-shaped member, the lower end of which is in sliding contact with the roll surface of each rotating roll, is provided above the high-voltage cable. Spraying device.