JPS58177358A - Screen printer - Google Patents

Abstract

PURPOSE:To enable a screen printer to match different sizes of printing mediums by a method in which negative pressure suction positions are selectively and movably provided in plural groove rows provided in the advancing direction of a printing table, and a feed belt is detachably provided in a going in and out manner from the table face. CONSTITUTION:Two feeding belts 2 are provided in such a way that they can hide in plural rows of grooves 3 formed on a printing table 1 during the printing period but come out of the grooves after the ending of printing. Printing medium M is fed from a medium region L to the printing table 1 as the belts 2 turn. Then, when the belts 2 are moved to the other grooves according to the sizes of the medium M, the belts 2 are pressed toward the axial direction of shafts 6 and 7, and the spring 8 of a pulley 2b is removed from concaved parts 6a and 7a and coupled with a desired concaved part. Also, negative pressure suction ports 11 are properly provided in the grooves 3, and air permeable parts 12 are combined with closing parts 13 in such a way as to enable concentrated suction of negative pressures in the table 1 to be performed selectively at any position. The printing position in a printing medium can be secured effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screen printing machine that performs printing processing by securing a thin plate material for a printed wiring board carried onto a printing table at a predetermined printing position on the printing table. To explain this in detail, a plurality of grooves in which the conveyor belt is housed are bored on the surface of the printing table at appropriate intervals on the edge, and negative pressure suction parts in these grooves are appropriately selected or It is characterized by being movable, and the interval between the conveyor belts can be adjusted as appropriate, and the material carried onto the printing table can be suctioned and fixed by a negative pressure suction section at an appropriate position. This invention relates to improvements to screen printing machines.

Conventionally, the material is carried onto the printing table by a conveyor belt and is secured at a predetermined printing position for printing processing. After the printing process is completed, the material is transferred to the next processing step using the same conveyor belt that was used when the material was brought in. The existence of screen printing machines that are designed to be transported to other locations is widely known. However, in this type of printing machine, it is not possible to adjust the distance between the conveyor belts, so it is inconvenient to handle materials of different sizes. This means that the printing machine cannot handle it completely. In addition, in terms of securing the printing position on the printing table, a structure that uses negative pressure suction force is generally widely used as a means of ensuring this, but this type of negative pressure suction structure In this method, a large number of small ventilation holes are formed on the entire surface of the printing table, and the material at a predetermined printing position is secured on the printing table by the negative pressure suction force from the small holes. When handling small materials with ventilation holes drilled across the entire surface of the printing table, there will be areas on the printing table where the surface of the material does not come in contact with the surface of the printing table, making it wasteful to suction negative pressure in those areas. become. Moreover, negative pressure suction in unnecessary parts also reduces the suction force in other parts, which is a big negative factor. Furthermore, when handling materials that have a considerable number of through-holes, the conventional negative-pressure suction structure on the printing table surface makes it difficult to apply negative-pressure suction force to desired parts of the through-hole material as appropriate. That is impossible.

The present invention was made in view of the above-mentioned prior art, and rationally utilizes a plurality of grooves on the area of the printing table provided in order to flexibly handle the conveyance of materials of different sizes. It is an object of the present invention to provide an efficient screen printing machine that can easily move a conveyor belt and can appropriately supply negative suction force to areas that require it. Embodiments of the present invention will be described below with reference to the drawings.

In Figure 1, a thin plate material M for a printed wiring board is placed on a printing table 1.
It is a schematic top view explaining the screen printing machine just before being carried in. In the figure, 2 is a conveyor belt for carrying the material M from the material supply IdL in the previous process onto the printing table 1 and carrying it out to the subsequent process after the printing process, with a groove bored in one side of the printing table. It is configured to be able to rotate within 3. The position of the material Mf'i carried onto the printing table 1 in its advancing direction is regulated by coming into contact with a stopper 4, and its position in the direction perpendicular to the advancing direction is regulated by a fixed position regulating member 5a and a moving position regulating member 5b. . It should be noted that the stopper 4 is designed to be recessed beyond the surface of the printing table during printing. After positioning on the printing table 1, the material M is brought into close contact with the surface of the printing table 1 to ensure its positioning. Next, a predetermined pattern of electric circuits is printed on the surface of the material M by running squeegees S and q on the surface using a screen plate (see FIG. 4). After printing is completed, the paper is carried out to the next processing step by the same conveyor belt 2 that was used when it was carried in. The conveyor belt 2 on the printing table 1 is designed to sink into the groove 3 during printing, and to be exposed outside the groove 3 after printing is completed. It may be moved, and its drive mechanism (not shown) may have an appropriate structure. A plurality of grooves 3 on the printing table 1 are formed on the edge at appropriate intervals in the direction of movement of the material M, and preferably the intervals are as small as possible. As described above, the material conveying belt 2 is configured to be rotatable within the groove 3 bored in one surface of the printing table. Although the structure of the conveyor belt 2 may be determined as appropriate, the structure shown in FIG. 2 is used here. In other words, the conveyor belt 2 includes a belt-shaped belt 2a and a pulley 2b on which the belt 2a is hooked.
It receives power from a drive shaft 6 that rotates outside the end of each groove 3 so that it can rotate independently within each groove 3. 7 is a support shaft of the conveyor belt 2 provided at the other end of the groove 3.

Although the conveyor belt 2 will eventually be able to move into the groove 3 as appropriate and rotate within the groove 3, the structure for attaching and detaching both shafts of the conveyor belt 2 to and from the groove 7 is appropriate. Often, for example, a drive shaft 6 facing each groove 3 of the printing table 1 as shown in FIGS. 2(1) and 2(2)
A structure may be adopted in which recesses 5a and 7a having a V-shaped cross section are formed in the curved surfaces of the support shaft 7, and a springing member 8 provided on the pulley 2b that always springs in the direction of the center thereof is engaged. 9
II'i key, which fits into a keyway (not shown) of the shaft 6.7. Thus, in order to move the conveyor belt 2 from one groove 3 to another groove 3, the conveyor belt 2
Slightly forcefully push the spring member 8 of the pulley in the axial direction of the shaft 6.7 to the recesses 5a and 7a of the shaft 6°T.
Then, the shaft 6 facing the desired groove 3
．． What is necessary is to engage the resilient member 8 with the recesses 5a and 7a of 7.

10 is a power source for a drive shaft 6 rotating outside the end of the groove 3. A negative pressure suction part is provided inside the groove 3 bored on one surface of the printing table, but the negative pressure suction part may be set as appropriate, for example, by a small hole or slit-shaped hole provided in the groove 3. It may be the negative pressure suction port 11 or the negative pressure suction member 15 movably mounted within the groove 3. Therefore, if the negative pressure suction part in this groove 3 is a small hole or slit-shaped negative pressure suction port 11 provided in the groove 3, the negative pressure suction action at a desired position is carried out by this small hole or slit. It is possible to appropriately select and move the desired position of the negative pressure suction port 11 in the form of It is possible to expect a negative pressure suction effect at a desired level by moving the position appropriately. Although the selection or movement of the negative pressure suction part within the groove 3 may be performed by any appropriate means, in FIGS. 3 to 6, the negative pressure suction part is formed into a small hole or slit-shaped negative pressure suction port 11 11tI'i A small hole' or a slit-like structure, or a combination of a small hole and a slit-like structure may be used (see FIGS. 5 (1) to (3)). Negative pressure air is supplied to the negative pressure suction port 11 through a supply path P from a vacuum pump (not shown) installed separately. Also, this negative pressure suction port 11
It goes without saying that the selection means may be determined as appropriate. For example, the selection means may be determined as appropriate. It is also possible to install them in combination in the groove 3 and select any position within the groove 3 to expect a negative pressure suction effect.

Note that the ventilation member 12 and the closing member 13 do not necessarily have to be separate and independent members, and a single member inserted into the groove 3 may have both functions. FIG. 6 is an explanatory diagram of the 11:1 ventilation member 12 and the closing member 13, which is one means for selecting the negative pressure suction port 11 at an arbitrary position, and shows the surface facing the negative pressure suction port 11. is formed in the recess 14. With such a structure, the other part of the negative pressure suction port 11 is slightly closed by the recess 14, and there is an advantage that a more efficient negative pressure suction action can be expected. Further, the negative pressure suction port 11 in the groove 3 to which the conveyor belt 2 is attached needs to be completely closed by an appropriate means, such as a thin-walled closing member 13 or other suitable thin plate member. Of course, in this case, the negative pressure suction port 11 may be closed by the belt 2a of the conveying belt 2 that is inserted into the groove 3 of the printing table 1.

In addition, when using the ventilation member 12 and the closing member 13 mentioned here, these negative pressure suction ports 11 installed in the groove 3
Neither of the selection members should protrude from one surface of the printing table, and preferably their surfaces are flush with the surface of the printing table.

Furthermore, the negative pressure suction port 11 may be installed anywhere within the groove 3, and is not limited to the bottom.

For example, it may be provided on the inner wall of the groove 3, and the groove 3 in this case does not necessarily have to be a bottomed groove. However, in this case, the ventilation member 12 and the closing member 13 need to be supported by appropriate means S, and the ventilation member 12
It is also necessary to pay attention to the communication structure with (see Figure 7).

8 to 12 are explanatory diagrams in the case where the negative pressure suction part is a negative pressure suction member 15 movably mounted in the groove 3. Negative pressure air is supplied from a separately installed vacuum pump (not shown) via a flexible hose 15a, and the air can move freely within the groove 3. 151) is a negative pressure suction member 150 ventilation hole. The size and structure of the negative pressure suction member 15 may be determined as appropriate, and if necessary, the groove 3
Any material may be used as long as it can move inside and independently exert a negative pressure suction action. There may be one or a plurality of the tabs and their ventilation holes 121), and the tabs themselves may also function as a cover for the groove 3.

Further, although the groove 3 in which the negative pressure suction member 15 moves is normally formed in a bottomed shape, it is not limited to this, and for example,
The flange portion supporting the negative pressure suction member 15 may be left, and the bottom portion may be made into a space 3a (see FIGS. 10 and 11). When the bottom is formed into a space 3a, there is an advantage that the negative pressure air supply hose 15a can be more easily stored when the negative pressure suction member 15 is moved. Thus, the negative pressure suction effect at any position on the printing table 1 can be achieved by moving the negative pressure suction member 15 to a desired position within the groove 3. Of course, it may be determined as appropriate.

Note that the negative pressure suction member 15 installed in the groove 3 must not protrude from the first surface of the printing table, and preferably its surface is flush with the first surface of the printing table. . Furthermore, it is preferable that the part of the groove 3 where the negative pressure suction member 15 and the conveyor belt 2 are not attached is filled with a suitable member on the same surface as the printing table 1.

As described above, the present invention rationally utilizes a plurality of grooves on an area having negative pressure suction parts to make it possible to appropriately adjust the interval between conveyor belts, and to adjust the negative pressure suction parts in the grooves as appropriate. Since it is possible to select or move a concentrated negative pressure suction action at any position on the printing table, it is possible to quickly respond to the collection of materials of different sizes and to apply the desired part of the material more easily. It has become possible to easily supply strong negative pressure suction power, and it has become possible to easily create screen printing machines that can be used in a wide range of applications and are highly efficient.

[Brief explanation of the drawing]

Fig. 1 is a partly omitted top view explaining the outline of the printing press according to the present invention, and Fig. 2 (1) and (2) show the relational structure of the conveyor belt, drive shaft, and support shaft in Fig. 1. An explanatory diagram, Figure K3 is a partly omitted top view showing the relationship between the negative pressure suction port in the groove of the printing table and the selection means of this negative pressure suction port, and Figure 4 is the print table and the top view on the printing table. A schematic explanatory diagram of the material and its relationship with the screen plate,
Fig. 5 is an explanatory diagram of the shape of the negative pressure suction port, Fig. 6 is an explanatory diagram of an example of the means for selecting the negative pressure suction port, and Fig. 7 is an explanatory diagram of the shape of the negative pressure suction port.
The figure shows a modification of the groove, negative pressure suction port, and ventilation member.
□ explanatory diagrams, Figures 8 and 9 are explanatory diagrams of the relationship between the II'i groove and the negative pressure suction member, Figures 10 and 11 are explanatory diagrams of modified examples of the groove and the negative pressure suction member, FIG. 12 is an explanatory diagram of the negative pressure suction member. 1...Printing table, 2...Transportation belt, 3...
・Groove, 7... Drive shaft, 11... Negative pressure suction port,
12... Ventilation member, 13... Closure member, 15...
Negative pressure suction member. Patented Hatakyujin Ha

Claims (1)

[Claims] The material that is continuously and automatically carried onto the printing table by a conveying belt is positioned at a predetermined position on this printing table to perform the printing process, and the conveying belt is submerged from the printing table surface during printing, In a screen printing machine that is exposed from the printing table surface after printing is completed, two or more grooves facing the direction of movement of the material are bored on the printing table surface, and a negative pressure suction part is installed in these grooves. Tomo VC
A screen characterized in that a conveyor belt rotatable within each groove is detachably attached, and a negative pressure suction part in a raised groove can be appropriately selected or moved within each groove. Printer.