JPH0357393Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a pendant box moving device for machine tools, and is useful when applied to large machine tools.

<Prior Art> FIG. 3 shows a pendant box moving device according to the prior art, and FIGS. 4a and 4b show its chain and cable parts, respectively. In these figures, 1 is a machine body, and 2 is a pendant arm swing bracket, which is attached to the machine body 1. 3 is a pendant arm, 4 is a pendant box, 5 is a cable that supplies electrical signals from the machine body 1 to the pendant box 4, 6 is a chain, one end of which is fixed to the pendant box 4, and the other end of which is the end of the cable 5. is fixed to the machine body 1. Chain 6 is thus lifting pendant box 4. 7 is a sprocket that meshes with the chain 6, and 8 is a drive unit for vertical movement of the pendant box that drives the sprocket 7. This drive unit 8 has a built-in brake mechanism using a spring force to maintain its position after driving. 10 is a guide roller for moving the chain. At this time, the cable 5 is integrally fastened with a metal fitting 9 so that it can move together with the chain 6. This is to prevent the cable 5 from loosening and getting caught on the pendant arm 3 or the like if the cable 5 does not match the movement of the chain 6.

<Problems to be solved by the invention> In the conventional technology as described above, fixing the cable 5 and the chain 6 at a certain pitch with the metal fittings 9 is a work that requires a lot of man-hours, and in long-term use, the cable 5 Slippage occurs between the cable 5 and the metal fitting 9, and the cable 5 is pulled in some parts, but loosens in other parts, making the movement of the chain 6 unstable, and in extreme cases, there is a problem that the sprocket 7 may become disengaged.

In view of the above-mentioned problems with the conventional technology, the present invention has been developed to provide a pendant box movement for machine tools that allows the amount of movement of the wire rope and cable to be the same without integrally connecting the wire rope and cable that lift the pendant box. The purpose is to provide equipment.

<Means for Solving the Problems> The configuration of the present invention to achieve the above object has a pendant arm whose base end is rotatably supported by the machine tool body and extends horizontally. In a machine tool pendant box moving device that moves a pendant box suspended from the tip, the pendant box is wound by a winch and is disposed along the pendant arm from the base end to the tip end. A wire rope that suspends the pendant box by fixing the pendant box to the end of the wire rope is connected to the machine tool body at one end and is placed along the pendant arm from the base end to the tip end. A cable whose other end is connected to the pendant box and serves as a transmission path for electrical signals between the machine tool body and the pendant box, and a wire rope that is rotatably supported at the tip of the pendant arm and hangs down toward the pendant box. In addition, the cable has a sheave that contacts the same outer peripheral surface through a gap, and the force directed toward the side opposite to the pendant box due to the weight of the cable on the machine tool body side centering on the sheave is due to the weight of the cable on the pendant box side. At the same time, the force directed toward the side opposite to the pendant box due to the weight of the cable on the machine tool main body side centered on the sheave is always greater than the force in the opposite direction to the aforementioned force due to the weight of the pendant box. The feature is that the force is always smaller than the force in the opposite direction.

<Operation> In the present invention having the above configuration, when the wire rope is let out from the winch, the pendant box descends under its own weight because the wire rope is constantly exerted a downward force by the pendant box. The sheave rotates due to the frictional force between the wire rope and the sheave, and the cable also moves together due to the frictional force between the sheave and the cable as the sheave rotates. On the other hand, if the wire rope is wound around the winch, the sheave will rotate due to the same frictional force as described above. At this time, since a force directed toward the machine tool is always acting on the cable, the cable also moves together with the wire rope.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

The device of this embodiment is the same as the prior art in that a swing bracket 2 is attached to a part of the machine body 1, but the pendant arm 3 whose base end is pivotably supported by the swing bracket 2 is , the distal end side 3b is formed to be removable from the proximal end side 3a, and is fixed to the upper surface of the proximal end side 3a, and the distal end of the piston rod 21a is connected to the distal end of the distal end side 3b. It is formed to be expandable and retractable by driving the cylinder 21. Further, a winch 8a is fixed to the base end of the pendant arm 3, and four sheaves 20a to 20d are rotatably supported from the base end to the distal end. Of these, the winch 8a is wire rope 6a
The wire rope 6 is wound by its drive.
A is fed out and wound up. The wire rope 6a hangs down from the tip of the pendant arm 3 along the pendant arm 3 from the winch 8a in contact with the sheaves 20b to 20d, and the pendant box 4 is fixed to the end thereof. The cable 5 has one end connected to the machine body 1, and is arranged along the pendant arm 3 in contact with the sheaves 20a to 20d, and the other end is connected to the pendant box 4 to provide electricity between the machine body 1 and the pendant box 4. It serves as a signal transmission path.

As described above, the wire rope 6a and the cable 5 are in contact with the sheaves 20b to 20d, and this aspect will be explained using the sheave 20d as an example and with reference to FIG. 2, which is a cross-sectional view taken along line A-A in FIG. I'll keep it. As shown in the figure, the wire rope 6a and the cable 5 are in contact with the same outer peripheral surface of the sheave 20d through a gap.

Furthermore, in this embodiment, the force directed toward the side opposite to the pendant box due to the weight of the cable 5 on the machine body 1 side centered on the sheave 20c is opposite to the force due to the weight of the cable 5 on the pendant box 4 side. It is constructed so that the force is always greater than the force in the direction. That is, when the pendant box 4 is at the lowest position, the weight of the cable 5 on the side of the pendant box 4 is maximum, but even at this time, the weight of the cable 5 on the side of the machine body 1 is made to be large. . Thus, considering only the cable 5, a force directed toward the machine body 1 is always acting on the cable 5. At the same time, the force directed toward the side opposite to the pendant box due to the weight of the cable 5 on the machine body 1 side centered on the sheave 20c is always smaller than the force in the opposite direction to the force due to the weight of the pendant box 4. It is configured so that That is, when the pendant box 4 is at the highest position, the weight of the cable 5 on the machine main body 1 side is the minimum, but even at this time, the weight of the pendant box 4 is large. Thus,
When the winch 8a is driven and the wire rope 6a is let out, the pendant box 4 is always lowered by its own weight. Specifically, in the case of this embodiment, one end of the cable 5 is connected to the machine body 1, and the force that pulls the cable 5 on the pendant box side due to the force caused by the weight of the cable on the machine body 1 side is transferred to the machine body 1. Since the force is due to half the weight of the cable 5 on the side, it is sufficient to make the following relationship hold at the same time.

2 x (cable weight on the pendant box side) < (cable weight on the machine body side) 2 x (weight of the pendant box) > (cable weight on the machine main body side) In this embodiment, the wire rope 6a is driven by the winch 8a. When the wire rope 6a is wound up, the sheaves 20b to 20d rotate due to the frictional force between the wire rope 6a and the sheaves 20b to 20d, but at this time, a force toward the machine body 1 is acting on the cable 5. , the cable 5 moves in synchronization with the wire rope 6a in the same direction due to the frictional force between the sheaves 20b to 20d and the cable 5.
On the other hand, the wire rope 6 is driven by the winch 8a.
When the wire rope 6a is let out, a force is always acting on the pendant box 4 to lower it, so the pendant box 4 descends while pulling the wire rope 6a. Along with this, wire rope 6a
Due to the frictional force between the sheaves 20b to 20d and the frictional force between the sheaves 20b to 20d and the cable 5, the cable 5 moves in synchronization with the wire rope 6a in the same direction.

<Effects of the invention> As specifically explained above with the examples,
According to the present invention, the movement of the wire rope can be transmitted to the cable via the sheave without causing slippage, so that the wire rope and cable can be moved integrally and synchronously while being separated. Therefore, the structure of the pendant box moving device can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along the line A-A, Fig. 3 is a front view showing the prior art, and Fig. 4a is its chain and cable. FIG. 4b is a side view showing the state of connection with FIG. 4a, and FIG. 4b is a cross-sectional view of FIG. 4a. In the drawing, 1 is the machine body, 3 is the pendant arm, 4 is the pendant box, 5 is the cable, and 6
a is wire rope, 8a is winch, 20a~2
0d is a sheave.

Claims (1)

[Scope of utility model registration request] A machine tool pendant box moving device that has a horizontally extending pendant arm whose base end is rotatably supported by a machine tool body and moves a pendant box suspended from the tip of the pendant arm, A wire rope is wound by a winch and is placed along the pendant arm from the base end to the distal end of the pendant arm, and the pendant box is fixed to the end of the wire rope, thereby lifting the pendant box. It is connected to the machine tool body, and is arranged along the pendant arm from the base end to the tip end, and the other end is connected to the pendant box, and serves as an electrical signal transmission path between the machine tool body and the pendant box. A wire rope that is rotatably supported at the tip of the pendant arm and hangs down toward the pendant box, and a sheave in which the cable contacts the same outer peripheral surface through a gap, and The force directed away from the pendant box due to the weight of the cable on the machine tool body side is always greater than the force in the opposite direction to the force due to the weight of the cable on the pendant box side. A machine tool characterized in that the force directed toward the side opposite to the pendant box due to the weight of the cable on the machine tool main body side is always smaller than the force in the opposite direction to the force due to the weight of the pendant box. pendant box moving device.