JPH0130545B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a propulsion mechanism used to intermittently propel a piston in an adhesive extrusion tool or the like.

[Conventional technology]

Conventionally, a ratchet mechanism or the like has been used to perform the above-described operation. This uses a pawl and a pawl wheel.

[Problem to be solved by the invention]

In the case of the above-mentioned conventional mechanism, it tends to be complicated, and it is difficult to incorporate this mechanism, especially in the case of a small product. Therefore, there was a desire for a smaller and more compact propulsion mechanism that would perform the same function.

The present invention has been made in response to such demands, and aims to provide a propulsion mechanism that can be constructed compactly with an extremely simple structure, that can be easily incorporated into small products, and that operates reliably. purpose.

[Means to solve the problem]

The present invention provides a propulsion rod 1 to which parts to be intermittently propelled are fixed above the holder part 9.
is held in a state where it is slidably inserted into the sliding body 13 and the torsion coil spring 2 held therein, and a return spring 14 is inserted between the spring suppressing plate 15 provided at the tip of the propulsion rod 1 and the sliding body 13. , the torsion coil spring 2 extends the middle part downward and bends outward to form a downward bend part 5, and both ends of the torsion coil spring 2 are fixed to the sliding body 13,
Furthermore, the above-mentioned problem was solved by a propulsion mechanism in which a trigger part 8 equipped with a sliding body pushing member 11 is pivotally attached to a holder part 9 via a torsion coil spring 10.

[Effect]

By rotating the trigger part, the downward bent part of the torsion coil spring is pressed and tightened, and the propulsion rod is tightened. In this state, when the pushing member presses the sliding member as the trigger portion rotates, the propulsion rod moves forward via the torsion coil spring. When the trigger part is returned, the propulsion rod is released from the tightening by the torsion coil spring and becomes able to slide against the torsion coil spring and sliding member, and the torsion coil spring and sliding member are moved by the action of the return spring, leaving the propulsion rod behind. Return to original position.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. Figures 1 and 2 show the principle of its operation. In the figure, reference numeral 1 denotes a propulsion rod, which is usually a round rod, and is slidably inserted into the coil portion of the torsion coil spring 2. A part 3 to be intermittently propelled is fixed to the propulsion rod 1. In this state, if the torsion coil spring 2 is simply moved back and forth, its coil portion will slide along the propulsion rod 1, and the propulsion rod 1 will not move. Therefore, before the torsion coil spring 2 is advanced, the coil ends 4, 4 and the intermediate portion 5 are pressurized in the winding direction, that is, in the direction of the arrow in FIG. 2. Then, the diameter of the coil is reduced and the propulsion rod 1 is tightened by the torsion coil spring 2.
It moves together with the torsion coil spring 2. When the torsion coil spring 2 retreats, the pressure applied to the coil end portions 4, 4 and the intermediate portion 5 is released. Then, the propulsion rod 1 is released from the tightening by the torsion coil spring 2, and even if the torsion coil spring 2 retreats, it reaches its forward position.
Thus, as the torsion coil spring 2 reciprocates,
The propulsion rod 1 and parts 3 are advanced by one pitch.

Next, a gun-type adhesive extruder incorporating the mechanism according to the present invention will be explained with reference to FIGS. 3 and 4. In the figure, 6 is a cylinder portion into which a cartridge filled with adhesive is loaded, and a piston 7 is inserted from its rear open end. The one shown is an extrusion tool for a two-component adhesive, and cylinder portions 6 are arranged side by side. In this case, a connecting member is installed to connect the ends of both cylinder parts 6,6. The distal end of the piston 7 is fixed to the propulsion rod 1. 8 is a trigger part, 9 is a holder part, and 10 is a torsion coil spring that always applies rotational force in the opening direction to both parts, and is attached to the pivot of the trigger part 8. 11 is a pushing member provided at the upper end of the trigger part 8; 12 is a hook part formed by bending the upper end of the trigger part 8. Reference numeral 13 denotes a sliding body that holds the torsion coil spring 2, which fixes the coil ends 4, 4 of the torsion coil spring 2, and bends the downward bent part 5 outward to expose it, and slides into contact with the hook part 12. let Reference numeral 14 denotes a return spring wrapped around the tip of the propulsion rod 1, which is fixed to a spring restraining plate 15 installed in the cylinder section 6. This return spring 14
always acts to push back the sliding body 13.

In the above configuration, first, the piston 7 is pulled back, and then the upper cover of the cylinder portion 6 is opened, a cartridge is loaded therein, and the tip of the cartridge is cut off to open the cartridge. and holder part 9
, put your finger on the trigger part 8, and pull it. Then, the hook part 12 rotates and pushes down the downwardly bent part 5 that is in sliding contact with the hook part 12. As a result, since the coil ends 4, 4 are fixed, the propulsion rod 1
will be wound into a coil. On the other hand, as the trigger part 8 moves, the pushing member 11 also rotates, pushing the sliding body 13 forward against the return spring 14. At this time, since the propulsion rod 1 is tightly wound around the torsion coil spring 2, it moves forward together with the sliding body 13. When the trigger member 8 is released, the trigger member 8 returns to its original position due to the action of the torsion coil spring 10, the pressurized state of the coil end 5 by the hook part 12 is released, and the sliding member 13 by the pushing member 11 is released. The pressurized state is also released. As a result, the torsion coil spring 2
The sliding body 13 also becomes slidable along the propulsion rod 1 and is pushed back to its original position by the action of the return spring 14. In this way, the propulsion rod 1 and the piston 7 fixed thereto move forward one pitch, and the adhesive in the cartridge is pushed out by that amount. Thereafter, by repeating the above-mentioned operation, a fixed amount can be pushed out.

〔Effect of the invention〕

As described above, the present invention has an extremely simple structure, can be easily incorporated into small products, and has the effect of operating reliably.

[Brief explanation of drawings]

1 and 2 are diagrams showing the structure of the present invention, and FIGS. 3 and 4 are diagrams showing the structure when the present invention is applied to an adhesive extrusion tool. Explanation of symbols, 1... Propulsion rod, 2... Torsional coil spring, 3... Parts, 4... Coil end, 5...
...downward bend.

Claims (1)

[Claims] 1 Above the holder part 9, the propulsion rod 1 to which the parts to be intermittently propelled are fixed is held in a state where it is slidably inserted through the sliding body 13 and the torsion coil spring 2 held therein. 1
A return spring 14 is interposed between the spring suppressing plate 15 provided at the tip of the spring and the sliding body 13, and the torsion coil spring 2 has its middle portion extended downward and bent outward to form a downward bent portion 5. Further, both ends of the torsion coil spring 2 are fixed to a sliding body 13, and a trigger part 8 having a sliding body pushing member 11 is further attached to the holder part 9.
A propulsion mechanism is constructed by pivotally attaching the following via a torsion coil spring 10.