JPH04247687A - Automatic kneading method of cream solder - Google Patents

Abstract

PURPOSE:To provide for an automatic kneading method for automatically kneading a cream solder by a printing operation according to squeegee on a screen when a machine at a pre- or a post-process stops for a certain amount of time. CONSTITUTION:When a stopping time of a machine at a pre- or a post-process reaches a certain time which is set previously, a substrate 4 to be printed next is put into queue on a carrying-in rail and a cream solder 7 is kneaded for a certain number of times by a pair of left and right squeegees 6 and 8 by printing operation on a screen 5. After this operation ends, the substrate 4 on the carrying-in rail 1 is carried in and is set on a work holder 2 and then printing is started again.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an automatic kneading method for cream solder, and in particular, the present invention relates to an automatic kneading method for cream solder, in which cream solder is automatically kneaded by a printing operation using a squeegee on a screen, especially when a machine in the previous or subsequent process is stopped for a certain period of time. Concerning automatic kneading method.

0002

BACKGROUND OF THE INVENTION In recent years, screen printing using cream solder has become mainstream in the field of circuit formation.

An example of the configuration of a conventional printing press and a printing method will be explained with reference to FIG.

As shown in the figure, the printing machine is divided into a board loading rail 1, a work holder 2, and a board unloading rail 3. A substrate 4 supplied from a substrate supply section (not shown) passes through the carry-in side rail 1 and is conveyed to the work holder 2. Next, the work holder 2 is placed on the screen 5.
By pressing the squeegee 6 against the screen 5 and moving it from the left or right to the right or left, the cream solder 7 is printed on the substrate 4 and passes through the carry-out rail 3 to proceed to the next process. Printing on the next supplied substrate 4 is performed by moving the squeegee 8 from the right or left to the left or right. In this way, printing is performed while using the squeegees 6 and 8 alternately. When the predetermined number of prints is reached, a roll of cleaning paper 9 is set on the back side of the screen 5 to remove dirt and start printing again.

[0005]

[Problems to be Solved by the Invention] In such a conventional printing method, if the machine for the previous or subsequent process stops for a long time during printing, the cream solder 7 is left on the screen 5 without changing its shape. Ru. If this happens, the cream solder 7 will become hard due to its characteristics, and if you start printing again in that state, it will not be possible to print uniformly, or the gap between the board 4 and the screen 5 will worsen, causing clogging of the screen 5, and as a result, the board This will increase the defective rate. If you want to soften the cream solder 7, you can temporarily collect the cream solder 7 in a separate container and stir it in there, but this takes time and effort, and reduces production.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an automatic kneading method for cream solder that can prevent changes in the properties of cream solder and keep printing conditions constant.

[0007]

[Means for Solving the Problem] In order to solve this problem, according to the automatic cream solder kneading method of the present invention, when the stop time of the machine in the previous or post process reaches a preset fixed time, the next printing process is performed. The board to be processed is placed on standby on the carry-in rail, the cleaning paper from the cleaner unit comes out from the back of the screen and is set on the back of the screen, the work holder is raised, and one squeegee on the side with cream solder is placed on the screen. The printing operation is performed by descending upward, moving from left or right to right or left and rising, and then the other squeegee performs the same printing operation as the one squeegee, repeating this printing operation a certain number of times, and The cream solder is automatically kneaded, and after the automatic kneading operation is finished, the cleaning paper is stored in the cleaning unit, the work holder is lowered, and the board on the carry-in rail is carried in and set on the work holder. Then, the work holder rises and printing resumes.

[0008]

[Function] The automatic kneading method for cream solder of the present invention has the above-described structure. When the machine in the previous or subsequent process stops for a certain period of time, the cream solder is automatically kneaded on the screen under certain conditions, so that the cream solder has a certain viscosity. This means that cream solder can always be printed under the same conditions.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for automatically kneading cream solder according to an embodiment of the present invention will be described below with reference to the drawings.

[0010] As shown in the flowchart in Figure 1 and Figure 2, if a machine that is in continuous operation is stopped for a long time due to a problem in the front (post) process, the cream solder on the screen becomes hard and causes problems in printing. To prevent this, set the machine stop time and automatic kneading conditions for cream solder in advance. During continuous printing, when the machine stops due to a problem in the previous (post) process and the machine stops for a preset period of time, the board 4 to be printed next is kept on standby on the carry-in rail 1. A roll of cleaning paper 9 in a cleaner unit (not shown) comes out from behind the screen 5 to the front, and the work holder 2 rises. Next, one squeegee 6 or 8 on the side where the cream solder 7 is located descends, moves from left or right to right or left and rises, and the other squeegee 8 or 6 then performs a printing operation. By repeating this a predetermined number of times, the hardened cream solder 7 is kneaded on the screen 5, and the viscosity is adjusted to an appropriate level to keep the printing conditions constant. When this operation is completed, the cleaning paper 9 is stored in the cleaner unit section, the work holder 2 is lowered, the substrate 4 on the carry-in rail 1 is carried in, and printing is resumed.

[0011] When restarting printing after the printer has been powered off for a long time with the cream solder 7 on the screen 5, the operation of kneading the cream solder 7 as described above is performed by external input.

According to the above method, even if the cream solder becomes hard, it can be kneaded on the screen, the work of returning the cream solder to another container and kneading it again can be omitted, and by keeping the printing conditions constant, the board quality can be improved. It is possible to improve the

[0013]

[Effects of the Invention] As is clear from the description of the above embodiments, according to the automatic kneading method for cream solder of the present invention, changes in the viscosity of cream solder can be prevented and printing conditions can always be kept constant. , can provide intelligent printing machines.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing an automatic kneading method for cream solder according to an embodiment of the present invention.

FIG. 2 shows a state in which cream solder is automatically kneaded by a printing machine used in the automatic kneading method for cream solder according to an embodiment of the present invention. (a) is a plan view, and (b) is a front view.

[Fig. 3] Showing the configuration of a conventional printing machine using cream solder, (a) is a plan view, and (b) is a front view.

[Explanation of symbols]

1 Loading rail 2 Work holder 4 Board 5 Screen 6 Squeegee 7 Cream solder 8 Squeegee 9 Cleaning paper

Claims (1)

[Claims] Claim 1: When the stop time of the machine in the front or back process reaches a preset certain time, the board to be printed next is placed on standby on the carry-in rail, and the cleaning paper in the cleaner unit is moved from the back of the screen. The workpiece is placed on the back side of the screen, and the workpiece holder rises.
One squeegee on the side where the cream solder is located descends onto the screen, moves from left or right to right or left and performs an upward printing motion, and then the other squeegee performs the same printing motion as said one squeegee. This printing operation is repeated a certain number of times to automatically knead the cream solder, and after this automatic kneading operation is completed, the cleaning paper is stored in the cleaning unit, the work holder is lowered, and the solder paste is placed on the carry-in rail. A method for automatically kneading cream solder in which a board is carried in and set on the work holder, and the work holder is raised to resume printing.