JPH04176649A - Dispenser for cream solder - Google Patents

Abstract

PURPOSE:To perform automatic kneading until the optimum viscosity for coating a base sheet with cream solder reaches by providing a stirrer in a syringe storing cream solder, a motor rotating the stirrer, a torque meter for the motor and a control unit controlling a compressor applying pressure on the liq. face of the solder. CONSTITUTION:Cream solder 3 is stored in a syringe 1 and a stirrer 2 rotated by means of a motor 6 is provided and a torque meter 7 is set on the rotating shaft 9 of the motor 6. A torque metered by means of the torque meter 7 corresponds to a viscous resistance of the stirred cream solder 3 and the torque meter 7 is connected with a control unit 5 controlling the motor 6 and as the control unit 5 controls a compressor 4 applying gas pressure to the liq. face of the cream solder 3 in such a way that a specified amt. of the cream solder 3 is output on a screen mask 18, it is possible to output automatically the cream solder 3 of a required viscosity on the screen mask 18.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a cream solder dispenser that automatically stirs cream solder stored in a syringe until it reaches a desired viscosity.

(Prior Art) Electronic components such as ICs and LSIs are mounted by applying cream solder onto the circuit pattern of a board using a screen printing machine and adhering to the cream solder. When applying cream solder to a board, a desired viscosity is required, so conventionally, at the start of printing work, etc., the cream solder in the container was kneaded manually for about 5 minutes until it reached the optimal viscosity, and then Printing was performed by transferring the material from this container to the syringe of a screen printing machine. When a viscous fluid such as cream solder is kneaded or otherwise stressed, its fluidity increases, which is called thixotropy.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional method, when starting work on -day, when restarting work after a long stoppage of operation, or after consuming all the cream solder in the syringe, it is difficult to use a new ream. It is extremely troublesome and the work efficiency is poor because it is necessary to manually knead the solder every time just before replenishing the solder. To provide a means for automatically kneading cream solder stored in a syringe until the viscosity becomes optimal for applying it to a substrate.

(Means for Solving the Problems) The present invention includes a syringe in which cream solder is stored, a stirrer disposed inside the syringe for stirring the cream solder, a motor for rotating the stirrer, and a motor for rotating the stirrer. A cream solder dispenser is composed of a torque meter that measures the torque of the motor based on the viscous resistance of the cream solder, a compressor that applies gas pressure to the liquid level of the cream solder, and a control unit that controls the motor and compressor. It is something.

(Function) In the above configuration, at the start of work on -day, or immediately after replenishing new ream solder after all the cream solder in the syringe has been consumed, the stirring bar is first driven by the motor, and the cream solder in the syringe is Stir and knead. Since the viscous resistance of cream solder is measured as motor torque, the control unit is notified of the torque value measured by the torque meter. When the cream solder reaches a desired viscosity, the drive of the motor is stopped in response to a stop signal from the control unit, thereby obtaining cream solder having an optimal viscosity for application to the board.

Next, the compressor is activated by a command from the control unit, and cream solder is discharged onto the screen mask.

(Example) Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view of a cream solder dispenser, and 1 is a syringe in which cream solder 3 is stored. A stirrer 2 that is driven and rotated by a motor 6 is provided inside the syringe 1 . Further, a hair ring 8 is provided at the contact portion between the syringe 1 and the stirrer 2 to ensure smooth rotation. A torque meter 7 is disposed on the rotating shaft 9 of the motor 6 to measure the torque when the stirrer 2 stirs the cream solder 3 in the syringe 1 . The torque measured by the torque meter 7 corresponds to the viscous resistance of the cream solder 3 being stirred. The torque meter 7 is
It is connected to a control unit 5 that controls the drive of the motor 6. The control unit 5 also has a function of controlling the compressor 4 that applies gas pressure to the liquid level of the cream solder 3 so as to discharge a predetermined amount of the cream solder 3 onto the screen mask 18 .

Therefore, according to this device, when starting work on day -, when restarting work after a long stop, or immediately after replenishing new ream solder 3 after all the cream solder 3 in syringe 1 has been consumed, etc. , by driving the motor 6,
The stirrer 2 is rotated to mix the cream solder 3, the torque at this time is measured by the torque meter 7, the viscosity of the cream solder 3 is notified to the control unit 5, and when the cream solder 3 has reached the desired viscosity, By stopping the driving of the motor 6 and then driving the compressor 4, the cream solder 3 having a desired viscosity can be automatically discharged onto the screen mask 18.

Further, this means can also be applied to a replenishment notification means for cream solder 3. That is, when the remaining amount of cream solder 3 in the syringe 1 decreases, the motor 6 is
is driven appropriately to measure the torque, and if the torque is less than a predetermined value, it is determined that the remaining amount of cream solder 3 is low, and a notification means such as a buzzer is activated to notify when it is time to replenish the cream solder 3. It is possible to notify that the time has come. Note that the present invention does not prohibit driving the motor 6 all the time, but if the motor 6 is constantly rotating, electric power will be wasted, so the driving of the motor 6 should be kept to the minimum necessary. desirable.

FIG. 2 is a side view of the container 16 that stores the cream solder 3. This container 16 includes a container body 12, an outer lid 10, and an inner lid 11.
It is more than that. - At the end of the day's work, spatulas 14
The cream solder 3 on the screen mask 18 is scraped off and collected in the container 16, but conventionally, the cream solder 3 on the screen mask 18 is collected in the container 16.
After removing the inner container from the container, the container was collected by rubbing the spatula 14 against the entrance of the container. However, with this method, there are problems such as cream solder adhering to the entrance of the container and making the entrance of the container sticky.

Therefore, in this method, a notch 13 is formed in the inner lid 11 as shown in FIG. 3, and a spatula 14 is rubbed against the brim 17 as shown in FIG. It is designed to be rubbed into the inside of the main body 12.

Note that the sealability of the container is maintained by placing a gasket 15 on the top of the inner container.

By forming the notch 13 and the collar 17 in the inner lid 11 in this manner, the cream solder 3 can be collected without contaminating the container 16.

(Effects of the Invention) As explained above, the present invention includes a syringe in which cream solder is stored, a motor located inside the syringe that rotates the cream solder, and a motor based on the viscous resistance of the cream solder. A cream solder dispenser consists of a torque meter that measures the torque of the cream solder, a compressor that applies gas pressure to the liquid level of the cream solder, and a control unit that controls the motor and compressor. can be automatically mixed to the optimum viscosity for application.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a side view of a cream solder dispenser, Fig. 2 is a side view of a cream solder storage container, and Fig. 3 is a perspective view of the inner lid of the container. ,
FIG. 4 is a side view during recovery. 1...Syringe 2...Stirrer 3...Cream solder 4...Compressor 5...Control unit 6...Motor 7...Torque meter

Claims (1)

[Claims] A syringe that stores cream solder, a stirrer inside the syringe that stirs the cream solder, a motor that rotates this stirrer, and the torque of the motor based on the viscous resistance of the cream solder. A cream solder dispenser comprising: a torque meter that applies gas pressure to the liquid level of the cream solder; a compressor that applies gas pressure to the liquid level of the cream solder; and a control unit that controls the motor and compressor.