JPH05318215A - Vertical shaft mechanism - Google Patents

Abstract

PURPOSE:To provide a vertical shaft device in which the weight of the vertical shaft moving parts is always balanced with the weight of a counterweight by means of a simple constitution. CONSTITUTION:The weight of a counterweight is fine adjusted by a deadweight for adjustment 18 in accordance with the weight of the vertical shaft moving parts 2, 3, 4, 7, 8 so as to cancel the weight of the shaft moving parts, and thereby the weight of the counterweight is always balanced with these moving parts 2, 3, 4, 7, 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical axis mechanism, for example, a vertical axis mechanism for a vertical column type machine tool.

[0002]

2. Description of the Related Art Conventionally, for example, in a vertical column type machine tool, a weight (hereinafter referred to as a counterweight) for canceling the weight of a vertical axis moving portion has been used. The vertical axis moving portion is servo-controlled and positioned by this counter weight, and a predetermined machining work or the like is performed with a tool arranged at the tip.

This counterweight is a weight having a weight corresponding to the vertical axis moving part, and this weight is connected to the vertical axis moving part through a pulley member and hangs down on the side opposite to the vertical axis moving part with a column as a machine body being sandwiched therebetween. Is configured.
As a result, the weight of the vertical axis moving unit is canceled while the weight of the weight and the weight of the vertical axis moving unit are balanced.

[0004]

By the way, an electric wire, a coolant pipe, a cooling water pipe, etc. are attached to the vertical axis moving part of such a vertical axis column type machine tool, and the vertical axis is changed by these design changes or additional parts. Since the weight of the entire moving part changes, it is rarely used in a completely balanced state.

Further, when the vertical shaft moving portion is attached to a precision sliding type oil sliding guide or the like so as to move in the vertical axis direction, the sliding resistance of the guide is large in the finishing state of each machine tool. Because of the change, the weights of the counterweight and the vertical axis moving section are not balanced. As described above, a method of positioning by servo control can be considered even when the weight of the counter weight and the weight of the vertical axis moving portion are not perfectly balanced.

However, when the weight of the counter weight and the weight of the vertical axis moving portion are not balanced,
For example, a command value as shown by a broken line in FIG. 5 is given by servo control, and the vertical axis moving unit makes a motion including different overshoot amounts in the vertical direction of the vertical axis as shown by a solid line in FIG.
There is a problem that positioning and repeatability may be deteriorated and servo adjustment may be very difficult.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a vertical shaft mechanism having a simple structure and capable of constantly balancing the weights of the vertical shaft moving portion and the counter weight.

[0008]

SUMMARY OF THE INVENTION In the present invention, the above object is to provide a vertical axis moving section that moves in an upright vertical axis direction, and in a vertical axis mechanism that executes vertical axis processing, depending on the weight of the vertical axis moving section. This is achieved by a vertical axis mechanism that includes a counterweight that finely adjusts the weight to cancel the weight of the vertical axis moving unit.

Further, according to the present invention, the counterweight may be composed of a first weight having a predetermined weight corresponding to the vertical axis moving portion and a second weight which can be finely adjusted.
Further, in the present invention, the second weight of the counterweight may be formed of a plurality of weight members, and the second weight may be detachably attached to the first weight according to the weight of the vertical axis moving portion.

[0010]

The operation of the present invention will be described with reference to the reference numerals of corresponding structures in the embodiments for the convenience of understanding. The counterweight 15 is finely adjusted according to the weight of the vertical axis moving parts 2, 3, 4, 7, 8 to adjust the vertical axis moving parts 2, 3, 4, 7, 8.
By canceling the weight of the vertical weight, the vertical axis moving parts 2, 3, 4, 7, 8 and the counter weight 1 are always
Weights of 5 can be balanced.

A first weight 16 having a predetermined weight corresponding to the vertical axis moving portions 2, 3, 4, 7, and 8 and a plurality of weight members are formed so that fine adjustment is possible, and the first weight 16 can be detachably attached. By configuring the counterweight 15 with the attached second weight 18, the weights of the vertical axis moving portions 2, 3, 4, 7, 8 and the counterweight 15 can always be balanced with a simple configuration.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are given, but the scope of the present invention is, unless otherwise stated in the following description, limiting the present invention.
It is not limited to these modes.

In FIG. 1, reference numeral 1 indicates a schematic structure of a vertical column type machine tool to which a counterweight according to the present invention is applied as a whole, and a cup type as a tool attached to a bracket 3 of a Z-axis main spindle 2 which is a vertical axis. The wheel 4 is controlled to move in the vertical direction of the Z-axis while rotating, and the workpiece 6 placed on the X-axis-Y-axis table 5 is subjected to desired cutting or perforation for planar processing. .

In the vertical column type machine tool 1 of this embodiment, as shown in FIGS. 2 and 3, the spindle 2 is attached to the Z-axis slide 8 through the spindle bracket 7, and the column 9 is used.
The Z-axis slide 8 is attached to the precision sliding type oil slide guide 10 formed by the concave groove 9a and the guide member 9b.
Is guided so that it can move in the vertical direction of the Z axis as a whole.

A wire 11 is connected to the upper portion of the Z-axis slide 8, and the wire passes through the pulleys 12a and 12b arranged at the upper end of the column 9 by means of a guide shaft 13 and a linear bearing 14 to move the Z-axis vertically. It is connected to a counterweight 15 adapted to be movable in the direction.

As shown in FIG. 4, the counterweight 15 includes a counterweight main body 16 selected for the main weight of the vertical axis moving portion composed of the main spindle 2, the bracket 3, the main spindle bracket 7 and the Z-axis slide 8, and this counterweight 16. A plurality of adjustment weights 18 are detachably attached to bolt-shaped weight attachment portions 17 that are erected on both ends of the lower surface of the weight body 16.

Therefore, in the case of the counterweight 15, even if the electric wiring, the coolant pipe, the cooling water pipe and the like for the main shaft 2 are attached or changed and the total weight of the vertical axis moving portion changes, the counterweight 15 is By selecting the number of adjusting weights 18 to be attached to the weight attaching portion 17, the total weight of the vertical axis moving portion can be canceled.

Similarly, the weight of the tool mounted on the bracket 3 is changed, and the sliding resistance of the waterproof seal or the sliding resistance of the precision sliding oil sliding guide 10 changes depending on the finishing condition. Also, by selecting the number of adjusting weights 18 to be attached to the weight attaching portion 17, the total weight of the vertical axis moving portion can be canceled.

This embodiment is configured as described above,
A plurality of counterweights 15 for canceling the weight of the vertical axis moving part including the spindle 2, the bracket 3, the main axis bracket 7, and the Z-axis slide 8 are detachably attached to the counterweight body 16 substantially corresponding to the weight of the vertical axis moving part. By forming the adjusting weight 18 as described above, it is possible to realize the vertical column type machine tool 1 that can always cancel the total weight of the vertical moving portion.

Further, according to the above-mentioned structure, a plurality of adjusting weights 18 are detachably attached to the bolt-like weight attaching portions 17 that are erected on both ends of the lower surface of the counter weight body 16, thereby simplifying the configuration. Thus, it is possible to realize the vertical column type machine tool 1 which can always cancel the total weight of the vertical axis moving portion.

Further, a vertical axis column type machine tool 1 capable of performing servo adjustments such as positioning, repetition, and minute feed easily and with high accuracy is realized, including the influence of mechanical factors such as the sliding resistance of the oil slide guide. it can.

In the above embodiment, the oil slide guide of the precision sliding type is used as the Z-axis slide guide of the vertical axis moving part, and the guide shaft and the linear bearing are used as the counter weight guide. The guide system is not limited to this, and the same effects as those of the above-described embodiment can be realized by using various guide systems.

In the above embodiment, the case where the present invention is applied to the vertical column type machine tool is described.
The present invention is not limited to this, and may be applied to, for example, a projection exposure apparatus or the like. That is, the present invention can be widely applied to a vertical axis mechanism that uses a counter weight to position the vertical axis moving portion that moves in the vertical direction of the vertical axis with high accuracy.

[0024]

As described above, according to the present invention, the weight of the counterweight is finely adjusted according to the weight of the vertical axis moving part to cancel the weight of the vertical axis moving part, so that the vertical axis is always maintained. It is possible to balance the weights of the moving part and the counterweight, and thus it is possible to realize a vertical axis mechanism that can position the vertical axis moving part with high accuracy.

Further, a first weight corresponding to the vertical axis moving portion,
Since the counterweight is composed of a plurality of weight members, which can be finely adjusted and is detachably attached to the first weight, the counterweight is configured so that the weight of the vertical axis moving portion and the counterweight is constantly maintained with a simple structure. A vertical axis mechanism that can balance the

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a vertical column type machine tool including a vertical mechanism according to the present invention.

FIG. 2 is a schematic diagram showing a relationship between a vertical axis moving unit and a counterweight in the vertical axis column type machine tool of FIG.

FIG. 3 is a plan view showing a configuration of a counter weight.

FIG. 4 is a characteristic curve diagram showing overshoot in the vertical direction of a vertical axis due to a conventional counterweight.

[Explanation of symbols]

 1 Vertical column type machine tool 2 Spindle 3 Bracket 4 Cup type wheel 5 X-axis-Y-axis table 6 Workpiece 7 Spindle bracket 8 Z-axis slide 9 Column 10 Oil slide guide 11 Wire 12 Pulley 13 Guide shaft 14 Linear bearing 15 Counter Weight 16 Counterweight body 17 Weight mounting part 18 Adjustment weight

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[Procedure amendment]

[Submission date] March 5, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

FIG. 4 is a cross-sectional view showing a configuration of an oil slide guide.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 5

[Correction method] Added

[Correction content]

FIG. 5 is a characteristic curve diagram showing overshoot in the vertical direction of the vertical axis due to a conventional counterweight.

Claims (3)

[Claims] 1. A vertical axis moving section that vertically moves in a vertical axis direction to perform vertical axis processing. In a vertical axis mechanism, the weight of the vertical axis moving section is finely adjusted to cancel the weight of the vertical axis moving section. A vertical axis mechanism comprising a counter weight for 2. The vertical axis mechanism according to claim 1, wherein the counterweight is composed of a first weight having a predetermined weight corresponding to the vertical axis moving portion and a second weight which can be finely adjusted. . 3. The second weight of the counterweight is formed of a plurality of weight members, and is detachably attached to the first weight according to the weight of the vertical axis moving portion. The vertical mechanism according to claim 2.