JPS6225262Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an adhesive dispensing device.

For example, as shown in FIG. 1, pressurized gas 4 is introduced into a container 2 containing adhesive 1 through an air supply pipe 3, which pushes a rubber bush 5 and causes adhesive 1 to be applied from a nozzle 6 at the tip of the container. Conventionally, in such an adhesive dispensing device (that is, a so-called dispenser device), the gas pressure P and supply time T are kept constant as shown in FIG. 2 depending on the application of the adhesive 1. Therefore, the amount of adhesive 1 applied was controlled to be constant.

However, since adhesives generally respond sensitively to changes in temperature and change their viscosity, the pressure P and supply time T of the gas are
There was a drawback in that it was not possible to control fluctuations in the amount of application due to changes in viscosity due to temperature fluctuations simply by keeping the values constant. In particular, when using the adhesive 1 to fix chip parts (not shown) on the board 7, the chip parts are small, so
An extremely small amount of adhesive 1, about 10,000 c.c., must be dispensed, and in such a case, if the ambient temperature fluctuates, it is impossible to maintain the dispensed amount at about 1/10,000 c.c. Ta.

The object of this invention is to eliminate the drawbacks of the above-mentioned conventional devices and to provide an adhesive dispensing device that dispenses a constant amount of adhesive regardless of fluctuations in ambient temperature.

This invention will be explained with reference to embodiments shown in the drawings.

FIG. 3 shows one embodiment of this invention, and since numerals 1 to 7 are similar to those in FIG. 1, their detailed explanation will be omitted. 11 is an ambient temperature measuring member that generates an output voltage corresponding to the ambient temperature using a temperature sensor such as a thermistor; 12 is a reference temperature setting member that generates an output voltage corresponding to a predetermined reference temperature; 13 14 is a temperature difference detection member that compares the output voltage of the ambient temperature measuring member 11 and the output voltage of the reference temperature setting member 12 and generates an output voltage corresponding to the difference in ambient temperature with respect to the reference temperature; A pulse generating member 15 which generates a pulse having a pulse width corresponding to the output voltage of the member is a plunger which opens a valve 16 provided in the air supply pipe 3 only during the pulse generating period of the pulse generating member 14. The pulse generating member 14 determines in advance the relationship between the viscosity and temperature of the adhesive 1 using the reference temperature as a reference, and based on that data, calculates the amount necessary to achieve a predetermined application amount at the reference temperature. Based on the pulse width corresponding to the opening time of the valve 16, the pulse width is varied according to the temperature difference. That is, as shown in FIG. 4, for example, when the temperature difference is 0, the pulse width corresponding to the required opening time of the valve 16 is
Assuming W ₀ , when the temperature difference is +Δt ₁ (i.e., the ambient temperature is higher than the reference temperature), the pulse width is W ₀ −WΔt ₁ (i.e., narrower than W ₀ ), and when the temperature difference is −Δt ₂ (i.e., when the ambient temperature is lower than the reference temperature), the pulse width is W ₀ + WΔ
t ₂ (that is, wider than W ₀ ).

The adhesive dispensing device described above determines in advance the relationship between the viscosity and temperature of the adhesive 1 to be used, and based on that data, adjusts the pulse width of the pulse generating member 14 to correspond to the required opening time of the valve 16. I'll keep it.
When such an adhesive dispensing device is used, the valve 16 is opened during the period of pulse generation from the pulse generating member 14 to introduce the pressurized gas 4 into the container 2, thereby pushing the rubber bush 5 and adhering it. The agent 1 will be applied from the nozzle 6. When the ambient temperature changes, the pulse generation period (that is, pulse width) changes accordingly, and the adhesive is always dispensed in a constant amount.

Note that as the pressure gas 4, pressure air or other appropriate pressure gas can be used, and the adhesive 1 used is preferably one whose relationship between viscosity and temperature changes linearly, but it is preferable that the relationship between viscosity and temperature changes linearly. It goes without saying that this invention can be modified in various ways to the above-described embodiments.

Since this device is configured as described above, it is possible to apply a constant amount of adhesive regardless of fluctuations in ambient temperature. Therefore, for example, to fix chip parts, an extremely small amount of about 1/10000c.c. Even when dispensing adhesive, it has excellent effects such as being able to consistently maintain the dispensing amount at around 1/10000c.c. regardless of fluctuations in ambient temperature. .

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view showing an example of a conventional one;
FIG. 2 is a timing chart of the one shown in FIG. 1, FIG. 3 is an explanatory diagram showing an embodiment of this invention, and FIG. 4 is a diagram showing the pulse width of the one shown in FIG. 1: Adhesive, 2: Container, 3: Air supply pipe, 4: Pressure gas, 5: Rubber bushing, 6: Nozzle, 7: Substrate, 11: Ambient temperature measuring member, 12: Reference temperature setting member, 13: Temperature difference detection Member, 14: Pulse generating member, 15: Plunger, 16: Valve.

Claims (1)

[Scope of utility model registration request] An adhesive dispensing device that introduces pressure gas into a container containing an adhesive to dispense adhesive from a nozzle at the tip of the container includes a member for measuring ambient temperature, and a member for measuring ambient temperature, Based on the relationship between the temperature difference of the measured ambient temperature and the viscosity of the adhesive, which is determined in advance with reference to the reference temperature, the detected value is determined based on the pulse width at the reference temperature. An adhesive dispensing device comprising: a member that generates a pulse whose pulse width varies depending on a temperature difference; and the pressurized gas is introduced into the container during a period in which the pulse is generated.