JPH0623747U - Screen exchange device for printing - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Simplifies screen replacement and facilitates automation. [Configuration] The screen 1 is installed on a screen base 13 of a screen printing machine 12, and is clamped and fixed from both sides by a screen fixing cylinder 11. Screen stand 1
An intermediate conveyor 14 is arranged on one end side of 3.
The intermediate conveyor 14 is swingably installed so that the other end, which is a swing end, moves up and down with one end side supported by the support column 15 as a fulcrum. The swinging end side of the conveyor 14 is moved up and down by an elevating mechanism 17 such as an air cylinder.
On the swinging end side of the intermediate conveyor 14, a plurality of stages of screen racks 18 and 20 are radially arranged around a fulcrum of the intermediate conveyor 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screen printing machine used for screen-printing cream solder or the like on a circuit board, and supplying and replacing a screen stored in another rack. In the present invention, the screen means that a screen mesh or a metal mask is attached to the frame.

[0002]

[Prior art]

 A screen printer is used to print cream solder for soldering chip-shaped circuit components mounted on a circuit board on the circuit board. This screen printing machine includes a screen having a screen frame stretched with a screen mesh, and a squeegee which is arranged on the screen and reciprocates a blade in a direction orthogonal to its longitudinal direction.

In this screen printing machine, each time a printed circuit board is printed, another screen having a different printing pattern is set and used. Such a printing screen is usually stored in a rack having several storage spaces. Conventionally, when replacing the screen set on the screen printing machine, the screen removed from the screen printing machine is stored in the storage area of the empty rack and another screen stored in another storage area is replaced. I took it out of the rack and set it on a screen printer. Then, such a screen replacement was performed manually.

[0004]

[Problems that the device is trying to solve]

 However, there is a problem that manual screen replacement requires manpower each time the printed circuit board is changed, resulting in loss of time and inability to cope with unmanned production lines. Therefore, in view of the problems of the conventional printing screen changing device, an object of the present invention is to provide a printing screen changing device in which the screen can be easily replaced easily and easily.

[0005]

[Means for Solving the Problems]

 That is, according to the present invention, in order to achieve the above-mentioned object, in a device for supplying a screen with a printing mask on a screen frame to a screen printing machine, a plurality of screen racks for accommodating the screen, and the screen rack. An intermediate conveyor for supplying a screen from the rack to the screen printing machine side is provided, and the intermediate conveyor is swingably installed so that the other end side moves up and down with the screen printing machine side as a fulcrum. Provided is a screen exchange device for printing, comprising a vertical movement mechanism for oscillating the side, and a plurality of stages of screen racks being arranged radially around a fulcrum of the intermediate conveyor.

[0006]

[Action]

 In the screen exchanging device for printing according to the present invention, the intermediate conveyor for supplying the screen from the screen rack to the screen printing machine swings by the vertical movement mechanism so that the other end moves up and down with the screen printing machine as a fulcrum. In addition, since the multiple screen racks are arranged radially around the fulcrum of the intermediate conveyor, when the screen is stored in the rack or the screen is sent from the rack to the intermediate conveyor side, You can swing the conveyor and select a rack to contact it. For example, when storing a used screen that has been placed on the intermediate conveyor after being removed from the screen printer in the rack on the upper level, and when taking out the screen to be used next from the rack on the lower level, first use the intermediate conveyor. The end opposite to the fulcrum of () (hereinafter referred to as “swing end”) faces upward, and the swing end is connected to the upper rack. Then, after the screen of the intermediate conveyor is sent to the same rack, the swing end is lowered, the lower rack is contacted, and the screen is received from the same rack. Then, this screen is sent to the screen printing machine on the fulcrum side by the intermediate conveyor and set. In this way, by simply swinging the intermediate conveyor with one end as a fulcrum, the rack of any stage and the screen printing machine side can be connected via the intermediate conveyor, so it is suitable for automation and suitable power means such as a pusher. When combined with, the screen can be replaced automatically.

[0007]

【Example】

 Next, an embodiment of the present invention will be specifically described with reference to the drawings. As shown in FIG. 1, the screen 1 has a screen frame 15 assembled in a rectangular shape and a screen mesh 2 attached to the screen frame 2. An emulsion or the like is applied to the mesh 2, and a cream is printed on the circuit board by a method such as photo printing. A pattern for printing a printing paste such as solder is formed. For example, as shown in FIG. 1, this screen 1 is installed on a screen base 13 of a screen printing machine 12, and is clamped and fixed from both sides by a screen fixing cylinder 11.

A squeegee 5 is arranged on the screen 1. The illustrated squeegee 5 is attached to the lower surface of the squeegee holding member 3, and the squeegee holding member 3 is slidably held along the guide 6 in the direction indicated by the arrow. Further, a screw shaft 9 installed in parallel with the guide 6 is screwed into a screw bearing 10 provided on the squeegee holding member 3, and the screw shaft 9 is driven by a motor 7. Therefore, by driving the motor 7, the squeegee 5 reciprocates along the guide 6 in the direction indicated by the arrow. Further, 4 is an elevating mechanism for elevating the squeegee 5. By the elevating mechanism 4, the tip of the squeegee 5 hits the upper surface of the screen mesh 2 of the screen 1 and further pushes it down. On the other hand, below the screen 1, a conveyor 8 that conveys the circuit board b to be printed is arranged. The circuit board b conveyed by the conveyor 8 is stopped immediately below the screen 1 and is raised and held right below the screen mesh 2.

An intermediate conveyor 14 is arranged on one end side of the screen bases 13 arranged in parallel. The intermediate conveyor 14 is swingably installed so that the other end, which is a swing end, moves up and down, with one end side thereof supported by a column 15 as a fulcrum. The intermediate conveyor 16 is driven by a motor 16 and conveys the screen 1 mounted on the intermediate conveyor 16 from the fulcrum side to the swing end side or in the opposite direction. Further, the swing end side of the conveyor 14 is moved up and down by an elevating mechanism 17 such as an air cylinder, whereby the intermediate conveyor 14 swings around the fulcrum, and the swing end moves up and down.

Further, a plurality of stages of screen racks 18 and 20 are arranged on the swinging end side of the intermediate conveyor 14. Although the screen racks 18 and 20 shown in the figure have two upper and lower stages, it is of course possible to provide the screen racks 18 and 20 with three or more stages. The screen racks 18 and 20 are in the form of conveyors, and are driven by motors 19 and 21, respectively, and the screen 1 mounted on the screen racks can be conveyed from one end side to the other end side. The plurality of screen racks 18, 20 are arranged radially around the fulcrum of the intermediate conveyor 14. In the case of the illustrated embodiment in which the screen racks 18 and 20 are provided in two stages, the upper screen rack 18 is installed horizontally, but the lower screen rack 20 introduces the screen 1 from the intermediate conveyor 14 side. It is installed so that one end is higher than the other end.

In this screen printing apparatus, as shown in FIG. 1, a screen 1 is set on a screen base 13, and it is sandwiched and fixed by screen fixing cylinders 11 from both sides. A paste, which is printing ink, is supplied on top. Then, the squeegee 5 is lowered by the lifting mechanism 4, the lower end side of the squeegee 5 is applied to the upper surface of the screen mesh 2, and the rotation of the motor 7 causes the squeegee 5 to follow the guide 6 as shown by an arrow in FIG. The paste is moved to the lower right direction and the upper left direction alternately, and the paste supplied on the screen mesh 2 is spread on the screen mesh 2 in a thin and uniform amount. Subsequently, the circuit board b is raised and held right below the screen mesh 2, the screen mesh 2 is pushed downward by the squeegee 5, and the squeegee 5 is moved while its lower surface is brought into contact with the printed surface of the circuit board b, that is, the upper surface. . As a result, the paste is printed on the circuit board b according to the print pattern formed on the screen mesh 2. Next, the circuit board b is discharged by the conveyor 8, another circuit board b is raised and held right below the screen mesh 2, and printed in the same manner. By repeating this in sequence, the paste is printed on the circuit board b one after another.

Next, a procedure for replacing the screen 1 for printing on another type of circuit board b will be described. First, after releasing the fixation of the screen 1 by the screen fixing cylinder 11, the screen 1 is placed on the intermediate conveyor 14 from the screen base 13. Now, as shown in FIG. 2, when the upper screen rack 18 is empty and the lower screen rack 20 stores the screen 1'to be used next, the intermediate conveyer is shown in FIG. As shown by, the screen 1 is fed from the intermediate conveyor 14 to the upper screen rack 18 as indicated by the arrow with the swinging end connected to the upper screen rack 18. Then, the intermediate conveyer 14 is swung to lower the swing end, and the intermediate screen 14 is brought into contact with the lower screen rack 20. In this state, the motor 21 (see FIG. 1) of the lower screen rack 20 is driven to send the screen 1 ′ from the lower screen rack 20 to the intermediate conveyor 14 as indicated by the arrow. After that, the intermediate conveyor 14 is returned horizontally, the screen 1'is sent to the screen base 13 side and set at a predetermined position, and is clamped and fixed by the screen fixing cylinder 11 from both sides. In this state, printing on the circuit board is performed as described above. The screens 1 and 1'can be sent manually from the screen base 13 to the intermediate conveyor 14 or from the intermediate conveyor 14 to the screen base 13, but a power means such as a pusher can also be used. . In particular, when automating the exchange of the screens 1 and 1 ', it is needless to say that it is necessary to employ power means.

[0013]

[Effect of device]

 As described above, according to the present invention, it is possible to provide a screen exchanging device which simplifies the exchanging of the screen and can easily shift to the automation.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a printing screen changing device according to an embodiment of the present invention.

FIG. 2 is a schematic side view of essential parts in a state in which a used screen is discharged to the screen rack side in the printing screen changing device according to the embodiment.

FIG. 3 is a schematic side view of an essential part of a state in which a screen to be used next in the printing screen changing device according to the embodiment is supplied to the screen printing machine side.

[Explanation of symbols]

 1 Screen 2 Screen Mesh 3 Squeegee Holding Unit 4 Squeegee Lifting Mechanism 5 Squeegee 6 Squeegee Holding Unit Guide 7 Squeegee Drive Motor 8 Circuit Board Conveyor 11 Screen Fixing Cylinder 14 Intermediate Conveyor 17 Vertical Moving Mechanism that Swings the Intermediate Conveyor 18 Screen rack 20 Screen rack b Circuit board

Claims (1)

[Reference number] 0040325-01 [Claims for utility model registration] 1. A device for supplying a screen printing machine with a screen mask covered with a printing mask to a screen printing machine. And an intermediate conveyer that is swingably installed so that the other end moves up and down with the screen printing machine side as a fulcrum, and includes a vertical movement mechanism that swings the other end. A screen exchange device for printing, wherein the stepped screen racks are arranged radially around a fulcrum of the intermediate conveyor.