JPH0628955B2 - Past collection mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paste solder printing apparatus for connecting printed circuit components such as printed boards and integrated circuits used in electronic equipment, and more particularly to a squeegee. The attached paste is related to a suitable means for collecting the solder from the squeegee.

[Background of the Invention]

As a conventional method of applying a solder paste to a printed circuit board, there is an example of using a printing device such as a stepped squeegee as disclosed in JP-A-57-181191. However, these conventional examples disclose the method at the time of printing the solder paste, and do not cover the recovery of the solder paste after the printing is completed. That is, the method of removing the solder paste attached to the squeegee after printing is not automated,
As shown in FIG. 4, when the squeegee 1 after printing is manually lifted from the metal mask 6 and lifted in the direction indicated by 3, the residual paste 4-a adhered to the squeegee 1 by the thin plate-like spatula 5. Since it was cut off, it took a lot of work time.

[Object of the Invention] An object of the present invention is to achieve automation of the paste printing process by efficiently collecting the paste attached to the squeegee.

[Outline of Invention]

A viscous paste-like solder containing a surface active agent such as rosin is extremely likely to adhere to a rubber material such as a squeegee. After printing, simply pulling up the squeegee causes paste dripping and stains the surroundings. Therefore, a jig is required to remove the residual paste attached to the squeegee once the squeegee is pulled up from the metal mask. At this time, in consideration of preventing the paste from adhering to such a jig as much as possible, a mechanism for dropping the paste with a thread-shaped one was devised.

That is, the present invention provides a filamentous paste cutting means which is held at a constant tension which is the surface of the squeegee in a state where the squeegee is pulled up from the metal mask after paste printing and moves along the residual paste adhering portion, A feature of the paste collecting mechanism is that the residual paste is separated from the squeegee and collected by the paste cutting means.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS. First, the structure of the mechanism will be described with reference to FIG. 1 and FIG. 2. The paste recovery mechanism 7 according to the present invention includes a paste cutting tool 10 for holding a thread-like object made of, for example, a polyimide resin material under tension, and a thin plate. A paste cutting plate 8 made of a metallic material or the like and having the paste cutting tool 10 attached to the tip thereof, and a paste receiving plate 9 disposed below the paste cutting plate 8 and made of a stainless steel material or the like,
Further, a vertical movement drive source 15 such as an air cylinder that enables the plates 8 and 9 to move up and down as shown by an arrow 14, and a paste receiving plate 9 that moves the paste cutting plate 8 back and forth in the direction of arrow 11.
And a back-and-forth driving source 16 composed of an air cylinder or the like for moving back and forth in the direction of arrow 12.

The operation method of the paste cutting plate 8 and the paste receiving plate 9 is the second
More specifically, referring to the drawings, the forward / backward movement 11 of the paste cutting plate 8 is performed by a drive unit 16-a at the tip of a forward / backward movement driving source 16 on a shaft 17 on which the paste cutting plate 8 is mounted and fixed. For the forward / backward movement 12, the holder 18 on which the paste receiving plate 9 is mounted is fixed, and
-b. The vertical movement 14 of the paste cutting plate 8 and the paste receiving plate 9 is simultaneously performed by a single drive source. As shown in FIG. 2, this mechanism allows the squeegee head 13 holding the squeegee 1 to be mounted. FIG. 2 shows the state at the end of paste recovery. At the start of the paste recovery, the plates 8 and 9 are retracted and raised from the tip of the squeegee 1.

The paste collecting operation is divided into steps (A) to (E) as shown in FIG. First, (A) shows a state in which the squeegee 1 is swept over the metal mask 6, that is, the squeegee 1 is stopped after printing is completed. Next, as shown in (B), the squeegee 1 is once driven so as to rise, and the squeegee 1 to which the paste 4 is attached separates from the metal mask 6. If the paste is cut only in this (B) step, the next step (C) can be omitted, but since it is not cut due to the viscosity of the paste, the paste 4 attached to the squeegee 1 by the slide operation 18 after the squeegee is raised in the (C) step. -a is separated from the paste 4-b remaining on the metal mask 6. In the next step (D), the residual paste 4-a attached to the squeegee 1 is cut, and the paste cutting plate 8 is once lowered 14 along the end face of the squeegee 1 which has been moved forward 11. Finally, the squeegee 1 is cut at the edge, and the residual paste 4-a is dropped onto the metal mask 6 as the dropping paste 4-c. In this state, the adhered paste 4-d may still remain on the paste cutting plate 8, and the paste 4-d is received by the advancing operation 12-a of the paste receiving plate 9 as shown in the step (E), and the paste is dropped. Prevent. More than
By the series of steps (A) to (E), it is possible to return almost the same amount of the solder paste 4 supplied to the metal mask 6 to the metal mask 6 at the end of printing.

〔The invention's effect〕

According to the present invention, since the paste attached to the squeegee can be efficiently collected, there is an effect that automation of the paste printing process can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view of a paste recovery mechanism according to an embodiment of the present invention, FIG. 2 is a side view showing the mechanism of FIG. 1 in a sectional view, and FIG. 3 is a view for explaining the operation of the mechanism. FIG. 4 is a diagram showing a conventional paste collecting method. 1 ... Squeegee, 4 ... Paste, 4-a ... Residual paste, 4-b ... Metal side paste, 4-c ... Drop paste, 4-d ... Adhesive paste, 6 ... Metal mask, 7 …… Paste recovery mechanism, 8 …… Paste cutting board, 9 …… Paste receiving board, 10 …… Paste cutting tool.

Claims (1)

[Claims] 1. A paste printing apparatus in which paste-like solder is supplied to a metal mask by sweeping the squeegee over the metal mask, and the squeegee of the squeegee is pulled up from the metal mask after paste printing. A thread-shaped paste cutting means held on the surface and along a portion where the residual paste is attached and held at a constant tension is provided, and the residual paste is separated from the squeegee and collected by the paste cutting means. Paste recovery mechanism.