JPH0437657Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to an electric sealing gun that presses a cartridge filled with caulking agent or sealant from the bottom to push out the sticky agent inside.

(b) Prior art As a conventional technology of this kind, there is
Publication No. 112867 (hereinafter referred to as "Conventional Example 1") and Japanese Patent Application Laid-open No. 1122251 (hereinafter referred to as "Conventional Example 2")
I got what is shown.

In the conventional example 1, the gear that transmits the rotation of the motor to the rack is made into a free gear so that the entire shaft can rotate, so that the rotation of the motor is not forcibly transmitted to the rack, and the rack can be pulled back at any time. It has been made possible to do so.

Furthermore, in the conventional example 2, a clutch is interposed between the gears provided between the motor and the rack, so that the driving force of the motor can be connected and disconnected. .

(c) Problems to be Solved by the Invention In both Conventional Examples 1 and 2 above, the press rod that presses the cartridge was returned to its original position by the user pulling back or by reversing the motor.

As described above, in the conventional type, the cartridge cannot be replaced unless the user pulls back the push rod one by one, which requires extremely troublesome operations.

Another problem is that it takes time to return the push rod to its original position by reversing the motor because a reduction gear is provided therebetween.

(d) Means for solving the problem The purpose of the present invention is to enable quick cartridge replacement by automatically pulling the press bar back to its original position using a spring when the press bar moves to a predetermined position. This is an electric sealing gun that pushes a cartridge filled with caulking or sealant from the bottom with a pushing rod driven by a motor to push out the adhesive inside. , a clutch that connects and disconnects the rotation of the motor that operates in response to the on operation of the switch; a first gear that is driven via the clutch; a second gear whose rotary shaft rotates in conjunction with the second gear; a third gear which meshes with the second gear when the second gear moves in response to an on operation of the switch; and a third gear formed on the third gear and the extrusion rod. a fourth gear that meshes with the rack, a spring is locked to the third gear or the fourth gear, and when the motor operates, the gear winds up the gear, and the second gear engages with the third gear. When the gear is released from the meshed state, the fourth gear is reversely rotated by the reaction force of the spring, and the push rod is pulled back.

(e) Examples Examples of the present invention will be described below based on the drawings. FIG. 1 is a longitudinal cross-sectional view showing the internal structure of an electric sealing gun according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the internal structure of the electric sealing gun shown in FIG.

2 is a main body, which has a handle 2a and a cartridge attachment part 2b.

4 is a motor built into the main body 2, and 6 is a clutch.

This clutch 6 connects and disconnects the rotation of the motor 4, and is connected when the motor 4 operates and disconnected when the motor 4 stops.

8 is a wheel shaft, which rotates when the clutch 6 is engaged.

10 is a first gear, which is fixed to the end of the wheel shaft 8 and rotates together with this wheel shaft.

A second gear 12 meshes with the first gear 10, and is supported by a lever 14 loosely fitted to the wheel shaft 8.

16 is a third gear, and 18 is a fourth gear that meshes with the third gear 16.

20 is an extruded rod on which a rack is formed;
It meshes with the gear 18, and its rotation causes it to move rightward in the figure and press the cartridge containing the adhesive. A switch 22 is provided at the base of the handle 2a of the main body 2, and when pressed with a finger, slides backward and returns to its original position by a spring 24 within the handle 2a.

A part of this switch 22 has an inclined elongated hole 22.
a, and a pin 26 attached to the end of the lever 14 is inserted into this elongated hole 22a.

28 is a limit switch built into the handle 2a, which is turned on when the switch 22 is pushed deeply;
The motor 4 operates and stops in response to signals from the motor.

30 is a U-shaped stopper attached to the rear end of the push rod 20.

The bent end 30a of the stopper 30 comes into contact with the rear end of the switch 22 which is in the on state when the push rod 20 is most protruded to the right in the figure, and acts to push the switch 22 back. It is.

32 is a spring, and in this embodiment, as shown in FIG. 5, the end thereof is attached to a part of the third gear 16, and is wound up when this gear rotates.

Next, the operation of the sealing gun of this embodiment having the above-mentioned structure will be explained using the operation explanatory diagrams shown in FIGS. 3 to 5.

First, when the switch 22 is in the OFF state as shown by the two-dot chain line in FIG. 1, the lever 14 supporting the second gear 12 rotates counterclockwise in the figure, as shown in FIG. Therefore, the gear 12a of the second gear 12 and the gear 16a of the third gear 16
It doesn't mesh with that.

Here, when the switch 22 is pushed in as shown in FIG. 1 or FIG.
The second gear 1 rotates clockwise in conjunction with the movement of the second gear 1.
The second gear 12a and the third gear 16a mesh with each other.

When the switch 22 is pushed further, the limit switch 28 is turned on and the motor is activated.
Further, the clutch 6 is connected and the rotation of the motor 4 is transmitted to the wheel shaft 8.

As a result, the first, second, and
The third and fourth gears 10, 12, 16, and 18 are driven, and the push rod 20 begins to move.

When the push rod 20 is moving in this way, if you release your hand from the switch 22, the spring 24 will push the switch 22 back slightly and turn off the limit switch 28, which will turn off the motor 4.
stops, and furthermore, the clutch 6 is disengaged.

At this time, the first, second, third, fourth gears 10,
12, 16, and 18 are in the meshed state.

Thereafter, when the switch 22 is pushed in again, the limit switch 28 is turned on, the motor 4 is operated, the driving force is transmitted to the gear via the clutch 6, and the push rod 20 begins to move.

When the push rod 20 protrudes to the far right in the figure, the switch 22 is pushed back by the end 30a of the stopper 30 interlocked with the push rod 20, and at the same time the limit switch 28 turns off, the motor 4 stops. The switch 22 is further pushed back by inertia, and the lever 14 moves again to the position shown in FIG. 4, and the meshing state between the second gear 12 and the third gear 16 is released.

Therefore, the load applied to the third gear 16 becomes lighter, and the spring 3 that is wound up by the rotation of the third gear 16 becomes lighter.
This third gear 16 rotates in the reverse direction due to the reaction force of 2.

Therefore, the pushing rod 20 moves to the left in the figure via the fourth gear 18 and returns to the initial state.

The spring 32 may be locked to the fourth gear 18, or the center end of the spring may be locked to the shaft of the gear and wound up.

(f) Effects of the invention According to the invention, since the gear is reversed by a spring without using a reduction gear, the pushing rod can be quickly returned to its original position.

Further, the switch can be automatically returned to the OFF state by a stopper linked to the push rod, and furthermore, no load is applied to the motor when the push rod is extended to the extreme end.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the internal structure of an electric sealing gun according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the internal structure of the electric sealing gun shown in FIG. 1, and FIG. and Figure 4 are the same as Figures 1 and 2.
Figure 5 shows the meshing state of the gears shown in Figure 1.
It is a figure which shows the spring and 3rd gear shown in FIG. 4...Motor, 6...Clutch, 10...1st
Gear, 12...Second gear, 14...Lever, 16
...Third gear, 18...Fourth gear, 20...Extrusion rod, 22...Switch, 24...Spring, 2
8...Limit switch, 30...Stopper, 3
2...Spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an electric sealing gun that presses a cartridge filled with caulking agent or sealant from the bottom with a pushing rod driven by a motor to push out the adhesive inside, a sliding switch; a clutch that connects and disconnects the rotation of the motor that operates in response to an ON operation of the switch; a first gear that is driven via the clutch; and a first gear that meshes with the first gear; a second gear whose rotating shaft rotates in conjunction with the operation of the switch; a third gear that meshes with the second gear when the second gear moves in response to the ON operation of the switch; and the third gear and the extruder. a fourth gear that meshes with a rack formed on a rod; a spring is locked to the third gear or the fourth gear; when the motor operates, the gear is wound up by the gear; When the gear is released from meshing with the third gear, the fourth gear is reversed by the reaction force of the spring, and the push rod is pulled back. (2) The extrusion rod is provided with a stopper,
The electric sealing gun according to claim 1, wherein when the pushing rod is moved by the motor, the switch, which is in the on state, is pushed back by the stopper and turned into the off state.