JPS63300832A - Table guide device - Google Patents

Abstract

PURPOSE:To enable a high accurate guide to be attained by forming one of the guides, which are guided by a guide rail on its guide surfaces directed to an opposite direction to each other, as the fixed guide, mounted being fixed to a table, and the other as the idling guide movable in the lateral direction. CONSTITUTION:A tension spring 21 presses an idling guide 15 to one guide surface 11B of a guide rail 11, and this action brings also a fixed guide 13, fixed to a table 12, into contact with a guide surface 11A in the opposite side of the guide rail 11 under a suitable pressure. The table 12, running along the guide rail 11 under this condition, can be moved being high accurately guided by the fixed guide 13 in a predetermined position with the guide rail 11 serving as the reference. Now generating a change of temperature, even when each part generates different thermal deformation, the idling guide 15 is continually pressed to the guide rail 11 by the tension spring 21, accordingly a device, pressing also the fixed guide 13 to the guide rail 11, enables a high accurate guide to be always attained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a table guide device for guiding a table in a straight line with high precision in machine tools, measuring instruments, newspaper fax machines, plotters, etc.

2. Description of the Related Art Conventionally, as shown in FIG. 5, a table guide device for holding a table movably in a straight line in a machine tool includes a guide rail 2 attached to a main body 1 and a guide rail 2 fixed to the bottom surface of a table 3. A device having a pair of guide portions 4 and configured to slide on the upper surface 2A and side surface 2B of the guide rail 2 is known. Further, as shown in FIG. 6, the main body 1 has an inverted V-shaped guide portion 5 on the top surface.
It is also known that the table 3 is provided with a guide rail 5 having a groove A, and a guide portion 6 having an inverted V-shaped groove that engages with the guide surface 5A is fixedly provided on the table 3.

Problems to be Solved by the Invention However, according to the above-mentioned conventional configuration, when the guide rail and the table including the guide portion are made of different materials, the coefficient of thermal expansion differs, so that when the temperature changes, The amount of thermal deformation of each component differs, and play may occur between the guide rail and the guide portion, or the guide rail may become so tight that it may become impossible to slide. Therefore, in order to eliminate the effects of temperature shrinkage, the guide section including the guide rail and table must be made of the same material.Therefore, there is no freedom in selecting the constituent materials, making it difficult to use inexpensive materials. There was a problem that.

The present invention was made in view of the above-mentioned problems, and it is possible to use materials that are optimal for the usage conditions regardless of the coefficient of thermal expansion of the constituent materials, and there is no problem even if there is a temperature change. It is an object of the present invention to provide a table guide device for a temperature compensation function group that can guide a table with high precision.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention forms guide surfaces facing in opposite directions on the guide rails, and on the other hand, the table guided by the guide rails has guide surfaces facing in opposite directions. A fixed guide with a sliding surface that contacts the guide surface on the opposite side is provided in a fixed manner, and a floating guide with a sliding surface that contacts the guide surface on the opposite side is provided so as to be movable in the lateral direction. The device is equipped with a configuration in which a pressing member is thrown to press the guide surface against the guide surface.

Operation In the present invention, with the above-described configuration, the pressing member presses the floating guide held on the table against one guide surface of the guide rail. It is pressed against the guide surface of the guide rail by pressure. As a result, even if different thermal deformations occur between the guide rail and the table, the contact between the fixed guide, the floating guide and the guide rail is always maintained.
High-precision guidance is possible, and in other words, it is possible to use materials with different coefficients of thermal expansion without impairing guide performance.

Examples Examples of the present invention will be described below. Fig. 4 is a schematic front view showing an embodiment in which the present invention is applied to the w and s sub-scanning mechanisms of newspaper fax machines, Fig. 2 is an enlarged view of section A in Fig. 1, and Fig. 3 is a side view of that part. It is.

In the same figure, 11 is a guide rail, with guide surfaces 11A and IIB on opposite sides and a guide surface 11 on the top surface.
It has C. 12 is a movable table on which a manuscript can be placed;
13 is a fixed guide fixedly attached to the lower surface of the table 12. The fixed guide 13 includes a guide surface 11A of the guide rail 11 and sliding surfaces 13A and 13B guided by the IIC. A fixed guide 14 is fixed to the lower surface of the table 12, and includes a sliding surface 14A guided by a guide surface 11B on the upper surface of the guide rail. 15 is a floating guide provided with a sliding surface 15A guided by the guide surface 11B of the guide rail 11. 16 is a guide support plate fixed to the table 12;
Reference numeral 7 designates a floating plate rotatably held by a pin 18 on the guide support plate 16, and 19 designates an operating shaft fixed to the floating guide 15, which is movable within an elongated hole 20 formed horizontally in the guide support plate 16. and is rotatably held by the floating plate 17. With this configuration, the floating guide 15 is connected to the floating plate 1.
It can move laterally by turning 7, and can come into contact with the guide surface 11B of the guide rail 11. Reference numeral 21 denotes a tension spring constituting a pressing member that presses the floating guide 15 against the guide surface 11B of the guide rail 11. Here, the materials of the guide rail 11, table 12, fixed guide 13, 14, floating guide 15, etc. are determined based on other conditions such as strength, hardness, wear resistance, cost, etc., without considering the coefficient of thermal expansion. It has been selected with consideration. As the guide rail 11,
For example, artificial marble is suitable from the viewpoint of cost and wear resistance.

In the apparatus configured as described above, the fixed guides 13, 14 and the floating guide 15 provided on the table 12 are in contact with and guided by the guide rail 11. At this time, tension spring 2
1 presses the floating guide 15 against one guide surface 11B of the guide rail 11, and due to this action, the table 12
The fixed guide 13 fixed to is also in contact with the guide surface 12A on the opposite side of the guide rail 11 with appropriate pressure. Since the table 12 travels along the guide rail 11 in this state, the table 12 can be guided by the fixed guide 13 to a predetermined position based on the guide rail 11 with high precision.

Now, even if temperature changes occur and different thermal deformations occur in each part, the floating guide 15 is always pressed against the guide rail 11 by the tension spring 21, and therefore the fixed guide 13 is also pressed against the guide rail 11, so that precision is always maintained. guide is possible.

In the above embodiment, the fixed guides 13, 14 and the floating guides 15 simply have sliding surfaces and are in contact with and guided by the guide surfaces of the guide rails, but air is blown onto these sliding surfaces. An air bearing may be used in which a large number of holes are provided to form a thin air layer between the sliding surface and the guide surface.

Further, in the above embodiment, the guide rail 11 is simply shown as having a rectangular cross section, but this guide rail can be modified in various ways. For example, as shown in FIG. Guide member 23A and this guide member 2
It is also possible to use a guide rail 23 consisting of a rail body 23B that holds 3A. With this configuration, only the guide member 23A is made of a highly wear-resistant material, such as artificial marble, and costs can be reduced. In addition, in the case of FIG. 4, the fixed guide 13 and the floating guide 15
It goes without saying that the guide surfaces for guiding the guide members 23A are not necessarily limited to the outer side surfaces as shown in the drawings, but may also be formed using the inner surfaces facing each other of the guide members 23A.

Effects of the Invention As is clear from the above description, the present invention provides a fixed guide in which one of the guides guided by guide surfaces facing in opposite directions formed on a guide rail is fixedly attached to a table, and the other is a fixed guide that is fixedly attached to a table. By making the floating guide movable laterally, and by providing a pressing member that presses the floating guide against the guide surface, even if different thermal deformations occur in the guide rail and the table, the fixed guide and the floating guide are always separated. The material is pressed against the guide surface of the guide rail with appropriate pressure and guided well, making it possible to achieve high-precision guidance without considering the coefficient of thermal expansion as the material of each component. This has the effect that the most suitable material for the device can be selected.

The table guide device of the present invention has large intervals between guide surfaces facing in opposite directions formed on the guide rail, and is therefore particularly suitable for devices whose dimensions are likely to change due to thermal deformation, such as newspaper fax machines and plotters. It is particularly suitable as a guide device for a table that moves in the sub-scanning direction on which a large recording paper or original document is placed.

[Brief explanation of drawings]

Fig. 1 is a schematic front view showing a table guide device according to an embodiment of the present invention, Fig. 2 is an enlarged view of part A thereof, Fig. 3 is a side view thereof, and Fig. 4 is a table guide according to another embodiment. A schematic front view of the device, FIGS. 5 and 6 are schematic front views showing a conventional table guide device, respectively. 11...Guide rail, IIA, IIB, IIC...
Guide surface, 12... table, 13... fixed guide,
13A, 13B...Sliding surface, 14...Fixed guide,
15...Idling guide, 15A...Sliding surface, 16...
- Guide support plate, 17... floating plate, 21... tension spring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Tetp 3B Figure 5 Figure 6

Claims (1)

[Claims] A guide rail for movably holding a table,
a guide rail having a pair of guide surfaces facing in opposite directions; a fixed guide fixed to the table and having a sliding surface that contacts one of the guide surfaces of the guide rail;
A table guide that is held movably on the table in a lateral direction and has a sliding surface that contacts the other guide surface of the guide rail, and a pressing member that presses the floating guide against the guide surface. Device.