JPS6144761Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a machine tool, particularly a machine tool equipped with a protective cover.

Conventionally, various protective covers have been used to protect machine tools from chips and cutting fluid generated during machining. 1 and 2 are general views of a conventional machine tool, in which a table 2 is placed on a table bed 1, and a workpiece is mounted on this table 2. A saddle 4 is placed on a bed 3 connected to the table bed 1 and moves in the left-right direction in FIG. 1 along a guide portion 3a provided on the bed 3. A column 5 is mounted on the saddle 4 so as to be slidable along guide portions 4a, 4a in a direction perpendicular to the sliding direction of the saddle 4 (left-right direction in FIG. 1). A spindle head 6 is supported on the front surface of the column 5 so as to be slidable in the vertical direction.

A tool is inserted into the main spindle 7, and as shown in FIG. and attached below. One of the telescopic covers 10a, 10a is attached between the lower end of the spindle head 6 and the lower end of the column 5, and the other is attached between the upper end of the spindle head 6 and the upper end of the column 5. It is being Therefore, as the spindle head 6 moves in the vertical direction, the telescopic cover 10a expands and contracts. As shown in FIG. 4, the telescopic cover 10a has a pair of guide members 12 having a plurality of vertical grooves 11 fixed on both sides of the front surface of the column 5.
Both ends of each cover plate of the telescopic cover 10a are slidably fitted into the telescopic cover 10a.

Further, FIG. 5 shows a telescopic cover 10b in which the cover plates of FIG. 3 are stacked in the opposite manner. In FIG. 6, one end is fixed to the spindle head 6,
Winding device 1 whose other end is provided at the lower part of column 5
3 shows a winding cover 14 made of cloth or the like. Furthermore, as shown in FIG. 7, there is a telescopic bellows cover 15 having one end fixed to the spindle head 6 and the other end fixed to the lower end of the column 5. These covers are similarly provided above the spindle head 6, so that chips, cutting fluid, etc. generated when a tool inserted into the spindle 7 processes a workpiece are removed from the feed screw 9, nut 8, and guides (not shown). This prevents it from adhering to surfaces, drive devices, etc.

However, as shown in FIGS. 3 to 7, the conventional telescope covers 10a, 10
b. In the winding cover 14 and the bellows cover 15, in FIG.
There was a drawback that the vertical groove 11 of No. 2 was easily clogged.

Moreover, in the telescopic cover 10b shown in FIG.
There were disadvantages in that the cover could be easily penetrated and damaged, causing galling, and that cutting fluid could enter and cause rust.

In addition, the winding cover 14 shown in Fig. 6 and the bellows cover 15 shown in Fig. 7 are likely to be scratched or punctured by the heat of the chips or the corners of the chips. There was a problem. Furthermore, in the case of the telescopic covers 10a and 10b, when the spindle head 6 moves, especially during fast running, the friction noise of the cover plates against each other becomes noise, which creates a poor working environment and reduces working efficiency.

The present invention has been made to solve the above problems, and one embodiment of the present invention will be described below based on the drawings. In Figure 8, 22 is the bed 23
This is a column mounted on the column 22 so as to be slidable horizontally (in the Z direction in the figure), and the spindle head 25 is slidable in the vertical direction, that is, in the Y direction in the figure, via a guide surface (not shown) on this column 22. It is supported by Spindle head 2
A nut 26 is fixed to 5, and a feed screw 27 is screwed into this nut 26. The upper end of the feed screw 27 is rotatably supported within a bracket 28 and connected to a drive motor 28a, and the lower end thereof is also rotatably supported within a bracket 29. As shown in FIG. 9, a pair of brackets 31a and 31b are provided at the upper end of the front surface of the column 22, and rollers 32 having a predetermined length are mounted on these brackets 31a and 31b, and bearings (not shown) are mounted on these brackets 31a and 31b. The axis of the roller 32 is in the horizontal direction.

A roller 33 having the same diameter and length as the roller 32 is rotatably supported at the front lower end of the column 22 by a bracket (not shown).

A shaft 34 is rotatably supported at the upper end of the rear part of the column 22 via brackets 35a, 35b and bearings (not shown), and a pair of sprockets 36a, 36b are fixed coaxially to both ends of the shaft 34. has been done. Similarly, a shaft 37 is rotatably supported at the lower end of the rear part of the column 22 via brackets 38a, 38b and bearings (not shown), and a pair of sprockets 39a, 39b are provided at both ends of the roller 37. It is fixed coaxially.

An end portion of a steel belt 41 having a width slightly smaller than the length of the roller 32 or 33 is fixed to the lower end portion of the front surface of the spindle head 25. This steel belt 41 is made of, for example, a spring steel plate, and its middle portion is It is stretched over rollers 33.

A pair of chains 42a and 42b are connected by fastening members T to both corners of the rear end of the steel belt 41 that is folded back to the rear of the column 22 by the roller 33, and the chains 42a and 42b
are engaged with the sprockets 39a and 39b, respectively, and are folded back over the rear of the column 22.

Similarly, the end of a steel belt 43 having substantially the same width as the steel belt 41 is fixed to the upper end of the front surface of the spindle head 25 (FIG. 9), and is stretched around the roller 32.

The tips of chains 44a and 44b are connected to both corners of the rear end of the steel belt 43 folded back behind the column 22 by the rollers 32 by fastening members T, and these chains 44
a, 44b are engaged with the sprockets 36a, 36b and folded back below the column 22.

The rear ends of the chains 42a and 44a, and 42b and 44b are connected to each other by tensioning devices C, C. As shown in Fig. 15, the tensioning device C applies tension to the chains 42a and 44a by a disc spring 45a, and the tension can be adjusted appropriately by a screw member 45b and a nut 45c.

Column 22 as shown in Figures 13 and 14.
On both front sides of the column 22, cover members 46a and 46b having an L-shaped cross section and extending in the vertical direction of the column 22 are fixed by bolts or the like, respectively.
A guide groove 47 is provided at opposite ends of 6a and 46b.
a, 47b are formed. These grooves 47a,
Both ends of the steel belt 43 are slidably inserted above the groove 47b, and similarly, the steel belt 43 is fitted in the groove 47b.
Both horizontal ends of the steel belt 41 are slidably inserted below the belts a and 47b.

In this way, both steel belts 41, 43
Accordingly, the feed screw 27, nut 26, column 22
The information surfaces etc. are covered.

Reference numeral 47 in FIG. 12 is a wiper fixed to the lower end of the column 22 near the bottom of the roller 33. This wiper 47 extends over the entire width of the steel belt 41 and lightly contacts the surface of the steel belt 41. Remove chips, cutting oil, etc. A coolant nozzle 48 is disposed below the wiper 47 at the base of the column 22.
No. 8 injection holes are directed toward the wiper 47.

Next, the effect will be explained.

The drive motor 28a is started to rotate the feed screw 27, and the nut 26 moves up or down together with the spindle head 25. The spindle head 25 is column 2
2 and moves the steel belt 41 accordingly. This steel belt 41
While rotating the roller 33, the chain 42a,
42b. Chain 42a,
42b is the roller 37 and sprocket 39a, 3
The chains 44a and 44b are moved via the fastening member T while rotating the chain 9b. chain 44
a and 44b move on the steel belt 43, and at this time both ends of the steel belts 41 and 43 slide along guide grooves 47a and 47b.

Steel belt 41 removes chips and cutting fluid during machining.
43 and will not adhere to the feed screw 27, guide surface, etc. inside the column 22. The chips and cutting fluid collide with the surface of the lower steel belt 41 due to their own weight, and fall together with the cutting fluid. When the spindle head 25 moves downward, the steel belts 41 and 43 rotate counterclockwise in FIG. 8, and at this time the wiper 47 (FIG. 12) acts to wipe away chips and the like on the surface of the steel belt 41. The chips etc. accumulated on the wiper 47 are removed from the nozzle 48.
It can be blown off by coolant, compressed air, etc. In addition, steel belts 41, 4
3 becomes loose, it is possible to maintain an appropriate tension at all times by adjusting the tension device C.

As explained above, according to this idea,
By constructing the cover with an elastically flexible steel belt and chain, it is possible to significantly improve the sealing performance against chips and cutting fluid. In addition, since the opposite side of the guide surface of the column is a chain, maintenance is easy, and since there are two chains and sprocket wheels that mesh with the chains are provided at both ends of the shaft, it has excellent strength and is suitable for steel belts. Since no excessive force is applied, there is no risk of twisting. In addition, not only is the problem of adhesion and accumulation of chips eliminated, but the space required for attaching the cover is reduced, which improves the accessibility of tools to the workpiece. This has the effect of requiring a simpler configuration.

The above configuration has been explained regarding the cover for the guide surface of the column 22, that is, the Y direction in FIG.
It is also possible to apply the present invention to a cover for the guide surface between the bed and the table 2, and the guide surface between the bed 4 and the column 5.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional machine tool, Fig. 2 is a side view thereof, and Fig. 3 is a sectional view showing a conventional cover.
Fig. 4 is a sectional view taken along the line A-A in Fig. 3, Figs. 5 to 7 are sectional views showing other conventional covers, and Fig. 8 shows a part of the machine tool of this invention. Side view, Figure 9 is a - arrow line view of Figure 8, Figure 10
Figures 11 and 11 are views taken along the - and - arrows in Figure 8, respectively, Figure 12 is a side view showing the lower end of the column, Figure 13 is a perspective view of the column, and Figure 14 is a view of Figure 13. It is a sectional view taken along the line XII-XII, and FIG. 15 is a front view of the tensioning device. 22... Column (fixed member), 25... Spindle head (movable member), 26... Nut, 27... Feed screw, 28a... Drive device (motor), 32, 3
3, 34, 37...Roller, 36a, 36b, 3
9a, 39b... Sprocket, 41, 43...
steel belt.

Claims (1)

[Scope of utility model registration request] A protective cover for a machine tool that covers and protects a guide surface of a fixed member and a sliding surface of a movable member that reciprocates along the guide surface from chips and cutting fluid, wherein both ends of the guide surface of the fixed member are rotatable outward. a pair of roller members having at least the width of a guide surface and attached to the movable member, and a pair of flexible band-like covers having at least the width of the guide surface, one end of which is fixed to the movable member and the other end of which is wrapped around the roller member. a shaft member provided on the opposite side of the guide surface side of the fixed member and having at least the width of the guide surface; a pair of sprocket wheels provided at both ends of the shaft member; a pair of chains connected to the other end sides of a pair of flexible band-like covers that mesh with each other and have both ends stretched around the roller member, and the flexible band-like cover follows the movement of the moving member. A protective cover for machine tools that moves in a closed loop.