JPS58223540A - Insert press-fit device - Google Patents

Abstract

PURPOSE:To improve the work efficiency by operating a piston rod lowering circuit and a pressure adjusting circuit so that a heater is lowered and after a fixed time an insert is pressed and inserted. CONSTITUTION:An insert press-fit device is provided with a piston rod lowering circuit (a), a pressure adjusting circuit (b), a press-fit mechanism 18 pressing the insert by means of a high pressure lowering circuit (c), and a raising mechanism 19 automatically adjusting the raised position of a heater 9 by means of a piston rod raising circuit (d) and a CR timer 25. Accordingly, the heater 9 can be smoothly lowered and the insert can be press-fitted exactly and in a short time, and in addition, the position of the heater can be automatically adjusted by operating the press-fit mechanism 18 and the raising mechanism 19 even if the press-fitting position of the insert is changed in one molding, thereby the necessity to adjust the heater manually at each time can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for press-fitting an insert such as a screw into a plastic molded product used for a housing, which is a cover for an office machine, computer, etc., for example.

Recently, the housings of office machines, computers, etc. are increasingly made of lightweight plastic molded products that can be molded and colored freely. For installation, it is usually necessary to fit inserts such as screws. Therefore, at present, the screw is placed in a pre-prepared hole in the molded product, and a soldering iron is applied to the tip of the screw to heat the screw and plasticize the resin around the hole, and then the screw is press-fitted. It is being put into a hole.

However, with this method, there are many holes in the molded product, and since it is manual work, it not only takes a considerable amount of time, but also screws are often inserted diagonally when press-fitting, so other parts cannot be inserted into the mold. It is often impossible to attach the product to the product. Moreover, because the screws were forced in, softened resin overflowed from the water inlet. For this purpose, resin trim work is also required.

Therefore, as a device to improve these points, an ultrasonic heating device is attached to a slide shaft that moves a certain amount in the vertical direction with respect to the platform for the molded product, and this ultrasonic heating device is placed in the hole of the molded product. A device was proposed that press-fits the insert by pressing it against the inserted insert, but in this device, the amount of movement of the ultrasonic heating device is set, so if the height increases, the insert may not be press-fitted enough. The height from the surface of the molded product placed on the platform to the tip of the ultrasonic heating device must always be kept constant. If there are multiple positions and different heights, it is necessary to change the position of the ultrasonic heating device each time, or to place the molded product on a platform using a bed, which is inconvenient. Furthermore, work efficiency has not yet been sufficiently improved.

The present invention has been made in view of the above-mentioned points and aims to further improve them.Even if the height of the press-fitting position of the molded product from the mounting base changes, the height of the heating device can be freely adjusted. The object of the present invention is to provide an insert press-fitting device that maintains a constant height from the surface of the molded product to the tip of the heating device, press-fits the insert accurately and in a short time, and improves work efficiency. be.

In other words, its characteristics are that, in an insert press-fitting device that presses and inserts an insert by moving a heating device such as an ultrasonic wave or a heater up and down with respect to a platform for a plastic molded product, (a) the piston rod lowering circuit of the cylinder; a press-fitting mechanism that operates a pressure adjustment circuit to lower the heating device, simultaneously operates the heating device, and after a certain period of time switches the piston rod lowering circuit to a high-pressure lowering circuit to press and insert the insert; ) The raising of the heating device by the operation of the piston rod raising circuit,
A variable resistor for adjusting the rising height is connected in series with a variable resistor for setting the rising height, whose resistance value decreases as the piston rod rises, and an OR timer is used in combination with this and a capacitor. The insert press-fitting device is equipped with a lifting mechanism that adjusts the height of the insert.

Embodiments of the device of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an overall view of the insert press-fitting device according to the present invention, in which (1) hub plastic molded product (2) multiplied by (1)
The piston rod (5) is attached to the outside of the cylinder (on the side in the figure) so that its piston rod (5) can be moved up and down by compressed air in the cylinder.
) is connected to the slide shaft 7) (6), which is fixed by the shift table (8) <s) fixed to the base plate (7) located outside the platform (1), and the piston rod (
It is configured to move up and down according to the movement of 5).

A heating device, for example, an ultrasonic heating device (9) (ff: arm 00 for coupling) is provided at the upper end of the slide shaft (6).

(11) is a switch for setting the elevated position of the heating device, which is attached to the outer peripheral surface of the air cylinder (4) and provided at regular intervals in the longitudinal direction;
) is shown as being positioned in three stages: (lla), (llb), and (llc).

FIG. 2 shows the air ring in the device as described above.
An example of the air circuit connected to (4) is shown. In the figure, (a) is the piston rod descending air circuit of the cylinder, and the air is transferred to the pressure reducing valve (b) and the switching valve θ3) (straight section).
, valve 04) (straight section) and air cylinder = (
4) and lowers the piston rod (5).

On the other hand, (b) is the pressure adjustment air circuit, and the air is supplied by the pressure reducing valve ◇5
) is introduced into the air cylinder (4) via the valve (16) and acts to push up the piston rod (5).

Therefore, this latter circuit (b) operates simultaneously with the piston rod lowering air circuit (a), and the piston rod (
5) is balanced by this pusher force, and the piston rod (5) is smoothly lowered to φ. ) to switch the high-pressure air that has passed through the
(dotted line), valve 04) (dotted line), and a mechanism for introducing the insert into the air cylinder (4) and press-fitting the insert under high pressure.

In addition, (d) is the piston rod raising circuit, and the pressure reducing valve (1
2), switching valve θ3) (dotted chain line), knob (
+4) The piston rod (5) is raised by air introduced into the air cylinder via the dashed line.

The operation system diagrams of the press-fitting mechanism (b) which operates such an air circuit to hold the insert and the lifting mechanism 09) which automatically adjusts the ascending position of the heating device are shown in Figure 3 (a) and middle), respectively. Shown below. First, in Figure 3 (a), the heating device 'It
(9) '? : When the descending relay 420) is activated, the switch of the valve θ4) and the switch SD of the valve 06) are turned on, and at the same time, the ultrasonic heating device f(9), which is a heating device, starts to operate. by this,
Air is introduced into the piston rod lowering air circuit (a) and the pressing air circuit (b), and the piston rod (5) begins to descend smoothly. After a certain period of time, that is, when the tip of the heating device (9) comes into contact with the insert set in the hole of the molded product, the switch of the switching valve 03) is activated by the timer - (Tz) that operates simultaneously with the ON of the switch SB of the valve 04). s□ is turned on, high pressure air is introduced into the high pressure F air down circuit (c), and the operating ultrasonic heating device (9) press-fits the insert into the molded product using the high pressure. in this case,
The pressurized air circuit (b) is in an active state.

On the other hand, in Fig. 3 (b), when the relay (2I) that raises the heating device (9) is activated, the valve (1→
When the switch is turned on and the switch SA is opened, air flows only through the piston rond rising circuit (d) and the heating device (9) begins to rise.

At the same time, the OR timer (25) operates.
This OR timer (25) is a variable resistor vR1 (26) that presets the rising height of the II'i heating device (9), and a variable resistor for correcting the rising height whose resistance value gradually decreases as the piston rod rises. The capacitors VRz (27) are connected in series and are combined with a capacitor (28).

In addition, as shown in FIG. 1, the variable resistor VR207)
C is fixed to the aforementioned board (7), and the lever c! 3), one end of which is the upper mounting part c of the air cylinder (4)! The piston rod (5) is in contact with the piston rod (5) and rotates as the piston rod (5) rises. However, when the height (h) from the mounting base (1) to the position where the insert is press-fitted exceeds a certain value, the variable resistor (v)
The resistance value of R2 (2 forces becomes zero, and the variable resistor vR1 (
26) will be activated. Therefore, the function of this variable resistor VR2 (27) is
This is to correct the height H) that rises after insertion of the heating device (9) when the heating device (9) is small to an ideal position.

This is the height (h) from the insertion base (1) to the position where the insert is press-fitted, as shown in Figure 4, and the height (H) to which the heating device (9) rises after the insert is press-fitted (from the surface of the molded product to the mounting base). variable resistor V R1
When (h) is relatively small with only ('':6), it takes time to increase the air pressure in the air cylinder (4) and raise the piston rod (5), so the raised position of the heating device is Although it is much smaller than the ideal position (b), variable resistor VR1 (36) and variable resistor VR2
(If 2η is used in combination, the height H) will approach (2).

However, such an OR timer (25) is designed to adjust the set time by varying the amount of time the capacitor C (28) is charged by changing the resistance value. Activate switch I24) and switch SA of valve θ→. The piston rod raising circuit (d) is closed by FF, and the raising of the heating device (9) is stopped.

Therefore, if this lifting mechanism α9) is used, the platform (1
Even if the height (h) from ) to the insert press-fitting position changes, the height (H) at which the heating device rises after press-fitting the insert will not be influenced by this and will approach the ideal position (), so the insert will The position is easy to determine.

It is also possible to freely change the position of the heating device (9) by raising the heating device (9) one stroke (H) at a time.

3(b)) is a switch for the case of the reverse order in the operation described later. .

Next, we will explain the effect when using the above-mentioned mechanism. First, as shown in Figure 5, one molded product (2
), the height of the press-fitting position of the insert changes in three steps: α, β, and γ.

In the case of press-fitting B and O, when insert A is first press-fitted, the heating device (9) is raised by H by the operation of the lifting mechanism (19) shown in FIG. 3 (b). Next, when press-fitting the insert B, the height from the heating device (9) to the insert B increases, but when the press-fitting mechanism (18) shown in FIG. 3 (a) is operated, the heating device (9)
is lowered until it contacts the insert B, and then high pressure air is introduced into the high pressure descending air circuit (0) by a timer (Tz) and the insert B is press-fitted. After that, the rising mechanism (1
9) causes the heating device (9) to rise by H2.

In the same way, press insert 0 into press-fit mechanism α8) and lift mechanism 0.
9). In this case, by changing the set time of the timer (Tz), the time until the insert is press-fitted can be changed. In addition, the rising height of the heating device (9) after insert E
Even if the height of the insert press-fitting position gradually decreases from α, β, and γ, it will remain almost the same, that is, H, medium H2, so if inserts at the same height are continuously press-fitted, the insert position setting will be fixed. Can be press-fitted quickly and accurately.

Conversely, when inserts O, B, and A are used in this order, when the lifting mechanism (19) is actuated by the switch (26), the heating device N (9) is raised by (H). moreover"
In order to raise the temperature twice, the current may be passed through the raising mechanism (19) again.

In this way, the inserts B and A can be press-fitted by raising the heating device (9) one stroke (H) at a time.

As described above, the insert E device of the present invention includes a press-fitting mechanism that presses the insert using the piston rod F lowering circuit, the suppression adjustment circuit, and the high pressure lowering circuit, and the histone rod raising circuit'QOR tie? - Since it is equipped with a lifting mechanism that automatically adjusts the lifting position of the heating device,
The heating device descends smoothly and inserts the insert accurately.
Moreover, it is possible to press-fit in a short time, and even if the position at which the insert is press-fit changes in one molded product, the position of the heating device can be automatically adjusted by operating the press-fitting mechanism and the lifting mechanism. Therefore, there is no need to manually adjust the heating device each time. Even if the height from the platform to the insert press-fitting position is small, the rising height of the heating device after the inserter) should be adjusted to the above OR.
Since the heating device can be raised to an approximately ideal position using the timer, the position of the insert can be determined easily especially when the height from the platform to the insert press-fitting position is small.

As described above, the insert press-fitting device of the present invention solves the problems of conventional insert press-fitting devices and can greatly improve work efficiency.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of the insert press-fitting device according to the present invention, Fig. 2 is a diagram of the air circuit connected to the air cylinder, and Figs. 3 (a) and (b) are the press-fitting mechanism for inserting the insert, respectively. Figure 4 shows the operating system diagram of the lifting mechanism that automatically adjusts the heating device's lifting position. FIG. 5 is an explanatory diagram showing the operation of the heating device when the height of the inserter 1-E person's position changes. (1)・・・・・・・・・A stand for placing plastic molded products. (2)...Plastic molded products. (4)...Tune/Cylinder, (5)...Tune/Piston Rondo. (6)・・・・・・Slide shaft, (9)・Song・
・Heating device. 08)...Press-fitting mechanism, (To)...Mountain--lifting mechanism. (a)...Piston rond descending circuit. (1)) Pressure adjustment circuit, (C) Song...
High voltage down circuit. (d)...Piston rond rising circuit. (25)...OR timer (26)...Variable resistor for setting the rising height. (27)・・・・・・Variable resistor for adjusting the rising height. (28)----・,, capacitor

Claims (1)

[Claims] 1. Insert press-fit Ml, in which the insert is press-inserted by moving a heating device such as ultrasonic waves or a heater up and down with respect to the platform for the plastic molded product by the up and down movement of the piston rod of the cylinder, and is connected to the piston mid lowering circuit of the cylinder. A press-fitting mechanism that activates a suppression adjustment circuit to lower the heating device and simultaneously activates the heating device, and after a certain period of time switches the piston mid lowering circuit to a high pressure lowering circuit to press and insert the insert, and a piston rod rising height. The setting variable resistor is connected in series with a variable resistor for adjusting the rise height, whose resistance value decreases as the piston rod rises, and an OR timer combined with a capacitor is used to operate the piston rod rise circuit. 1. An intert press-fitting device comprising: a lifting mechanism that automatically adjusts the lifting of a wall heating device.