JPH06126576A - Aligning device for rail in planer - Google Patents

Abstract

PURPOSE:To provide an aligning device which accurately positions an elevator rail into a centering state and fixes it on a planer, and can be widely used for various sizes of elevator rails. CONSTITUTION:A plurality of electro-magnetic type magnet chucks 32a to 32f longitudinally mutually crossing at right angles are laidly provided on a table 14 in a plane state. Front and rear end centering devices 36, 38 which clamp both sides at the front and rear end of a rail to execute its centering are receivably provided, and in the case of receiving the centering device, its cover is leveled with the magnet chucks 32a to 32f. A middle centering device 80 which clamps both the sides of the middle section of the rail in order and executes its centering is provided so as to be movable in the longitudinal direction of the table 14. First the centering of the front and rear parts of the rail are executed, and the above parts are fixed. Next the centering of a plurality of middle parts is executed in order by the movable middle centering device 80, and the middle parts are fixed by the magnet chucks 32a to 32f corresponding to them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centering device for highly accurately and efficiently performing cutting work on rails, particularly elevator rails, using a planing machine.

[0002]

2. Description of the Related Art An elevator rail has a shape as shown in FIG.
Also, it is necessary to cut the inclined surfaces 5 and 6 forming the boundary between the upper surface and both side surfaces to finish with high accuracy.

Conventionally, a planing machine has been used for processing such elevator rails. That is, a workpiece is fixed on a table of a planing machine, and required cutting is performed by a cutting tool that is intermittently fed in a direction perpendicular to the movement direction of the table. In order to finish the cutting with high accuracy, it is indispensable to accurately center the workpiece with respect to the cutting tool and fix it on the table.

As shown in FIGS. 11 and 12, the conventional centering method generally used is a T-shaped groove b on the upper surface of the table a on both sides of the position where the rail workpiece 1 is to be fixed.
And c are formed along the longitudinal direction of the table a, and a piece d and a clamp e corresponding to the rail size are mounted in these T-shaped grooves, and the clamp is manually or hydraulically operated while positioning by the piece, The base portion 7 was sandwiched and fixed.

Further, as another centering method, as shown in FIG. 13, a plurality of magnets f are fixed at predetermined intervals in the length direction of the table a, and the work 1 is attracted and fixed thereon. Among them, there is also proposed one in which a positioning device g corresponding to the rail size is installed in the space between the magnets.

[0006]

However, according to the former method, the chips produced when the workpiece 1 is cut with the cutting tool enter the T-shaped grooves b and c formed on the table a, and these T Top d and clamp e installed in the groove
There was a problem that it took a lot of time to clean because a phenomenon such as being entangled with the product occurred. In addition, there are cases where the operation must be stopped to clean during cutting, which is not preferable in terms of work efficiency and yield.

In the latter method, no groove is formed on the table a itself, but the mounting surface of the workpiece 1 is not the same, and the cutting chips enter the lower space between the magnets f or the positioning device g. They were entangled and caused similar problems.

Further, in each of the above-mentioned conventional examples, the workpiece 1
Positioning is performed with reference to the base portion 7, but even if the base portion 7 is accurately centered, the main body portion (upper surface 2, both side surfaces 3 and 4, inclined surfaces 5 and 6) to be originally cut is defined. The centering accuracy of the upper part) may be impaired.

Further, there are various specified sizes of elevator rails, and in the case of the above-mentioned conventional example, different tops d and positioning devices g must be used according to the size of the workpiece 1, which is troublesome. In addition, the product cost was increased.

[0010]

SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned problems of the prior art and completely eliminates the unevenness from the mounting surface of the rail workpiece on the planing machine at least during the cutting work. It is an object of the present invention to provide a centering device having a novel configuration which is flat and can achieve highly accurate cutting work and can easily remove chips.

In order to achieve this object, a rail centering device for a planing machine according to the present invention comprises a plurality of electromagnetic magnet chucks arranged on a table of the planing machine and orthogonal to the electromagnetic magnet chucks. And a centering device for positioning at a predetermined axial center position on a portion of the rail arranged in the longitudinal direction of the table on the electromagnetic magnet chuck, and the electromagnetic magnet chuck below the rail positioned by the centering device. The rail is attracted and fixed to the position by magnetizing.

The centering device includes an elevating member capable of ascending / descending above a table, a clamp means for sandwiching both side surfaces of the rail when the elevating member descends, and a pair of both side surfaces of the rail for actuating the clamp means. Clamping and centering actuation means.

The centering device is provided on the cross beam of the planing machine and performs centering at a position where each electromagnetic magnet chuck on the table moving in the longitudinal direction is directly below the centering device or moves in the longitudinal direction of the table. It can be configured to be mounted on a possible moving body and stop at a position above each electromagnetic magnet chuck to center that part of the rail.

The centering device includes a front end centering device for centering the front end of the rail on the electromagnetic magnet chuck close to the front end of the table, and a rear end of the rail on the electromagnetic magnet chuck close to the rear end of the table. Can be configured to include a rear end centering device for centering and an intermediate part centering device for centering an arbitrary number of predetermined intermediate parts.

The front end centering device and the rear end centering device are provided in contact with the front end and the rear end of the table, respectively, and an openable and closable cover that is flush with the upper surface of the electromagnetic magnet chuck in the closed state, and the cover. With the open state, the clamp means is protruded above the front and rear electromagnetic magnet chucks to be lifted to a position where the rail front and rear ends are sandwiched, and the rail front and rear rails are operated by operating the clamp means. And an actuating means for clamping and centering the ends.

The middle part centering device includes an elevating member which can be elevated and lowered above the table, a clamping means which is positioned so as to sandwich both side surfaces of the rail when the elevating member descends, and both sides of the rail by operating the clamping means. And means for clamping and centering the surface.

This intermediate centering device is provided on the cross beam of the planing machine and performs centering at a position where each electromagnetic magnet chuck on the table moving in the longitudinal direction is directly below the centering device, or the table longitudinal It can be configured to be provided on a movable body that can move in a direction, and stop at a position above each electromagnetic magnet chuck to center the relevant portion of the rail.

The operation sequence of these centering devices is as follows. First, the front and rear end centering devices are simultaneously operated, the front and rear end portions of the rail are simultaneously clamped and centered, and then the front end and rear end electromagnetic types are operated. The front and rear ends of the rail are attracted and fixed by magnetizing the magnet chuck, and then the intermediate centering device is operated to clamp and center a predetermined intermediate portion of the rail, and then the electromagnetic type of the intermediate position is used. It is preferable that the magnet chuck be magnetized to operate so as to attract and fix the middle portion of the rail.

Furthermore, a wiper for removing chips and cutting fluid generated during cutting can be provided.

[0020]

A centering device is a combination of a centering device for centering a predetermined portion of a rail and an electromagnetic magnet chuck at a position corresponding to the predetermined portion centered by the centering device.

The upper surface of the electromagnetic magnet chuck on which the rail is placed is completely flat, and the centering device is concealed or retracted after the centering work is completed. The operation of removing chips and cutting fluid generated by cutting can be easily performed without disturbing the cutting.

The front end portion and the rear end portion of the rail are simultaneously centered by the front end portion and the rear end portion centering device, and then the predetermined middle portion of the rail is sequentially centered by the middle portion centering device. The long rail can be centered with high accuracy and efficiency over the entire length.

[0023]

1 and 2 show the configuration of a centering device according to an embodiment of the present invention used with a planing machine for cutting an elevator rail.

The planing machine 10 itself has a known structure,
A fixed bed 12, a table 14 provided on the bed for horizontal reciprocating motion in the longitudinal direction, a column 16 standing upright from both sides at a substantially intermediate position of the bed, and a column extending above the table between the columns. There are provided a cross beam 18 and a unit 22 having a large number of cutting tools 20 movably mounted along the cross beam.

The driving means for moving the table 14 horizontally with respect to the bed 12 and the driving means for moving the unit 22 in the horizontal and vertical directions with respect to the cross beam 18 are of known constructions. Can be provided and is omitted from the drawing.

Reference numeral M in the drawing is a reference position in the longitudinal direction of the bed 12. Therefore, the bed 12 extends further to the right than that shown in the drawing, but such an extended portion is omitted for convenience of illustration.

In the illustrated example, a planing machine 1 capable of simultaneously cutting 12 elevator rails at a time
It is shown as 0.

The elevator rail to be cut by the planing machine 10 is preliminarily subjected to a predetermined centering operation by the centering device 30 according to the embodiment of the present invention. The configuration of the centering device 30 will be described in detail below.

On the upper surface of the table 14, a plate-shaped electromagnetic magnet chuck 32 (32a ...
32f) is applied in a plurality of strips at predetermined intervals. A large number (12) of elevator rails are placed on these electromagnetic magnet chucks 32 and are juxtaposed at substantially predetermined intervals in the table width direction.

In this embodiment, the iron plate 34 is placed flush with the space between the electromagnetic magnet chucks 32 to eliminate the gap. This serves to support the elevator rail in a stable manner and facilitates discharge of chips generated during cutting by the cutting tool 20. Instead of using the iron plate 34, a large number of electromagnetic magnet chucks may be spread on the table 14 without any gap.

The centering device 30 is provided with first to third centering devices. First centering device 36
The second centering device 38 and the second centering device 38 are installed substantially in front of and behind the table 14, respectively, and perform centering processing on the front and rear ends of the elevator rail, respectively.

Since the configurations of the front end centering device 36 and the rear end centering device 38 are substantially the same, the front end centering device 36 will be described below with reference to FIG.
Will be described with reference to.

The front end centering device 36 is disposed on the bed 12 of the planing machine 10 in contact with the front end portion (right end in FIG. 1) of the table 14 and inside a casing 40 having a width dimension substantially equal to that of the table 14. Be accommodated. A cover 42 that closes the upper surface of the casing 40 is openably and closably provided.

A cylinder 44 is installed on the bottom surface 41 of the casing 40, and a rack 48 that meshes with the pinion 50 is formed on the front upper surface side of the piston rod 46 of the cylinder 44.

An arm 54 is attached to the rotating shaft 52 of the pinion 50. The tip of the arm 54 is pivotally supported by a shaft 58 provided below the right end of the actuation body 56 in the figure.

With the above structure, the arm 54 connected to the shaft 52 rotates with the movement of the piston rod 46,
The operating body 56 moves up and down to open and close the cover 42 supported by the support roll 60. Figure 3 shows piston rod 4
6 shows the most forwardly projected state, and the cylinder 44 is hydraulically operated so as to retract from this position, whereby the pinion 50 rotates clockwise in the drawing, and the arm 5
4 also rotates in the same direction and occupies the position shown by the phantom line in FIG. At this time, the cover 42 comes to the position shown by the phantom line in the figure to close the casing 40, and in this state, the cover 42 is flush with the electromagnetic magnet chuck 32 (and the iron plate 34) on the table 14.

A second arm 61 is provided in parallel with the arm 54, and is rotatably connected between a fixed shaft 62 and a shaft 63 provided substantially below the central portion of the operating body 56. The arm 62 rotates in conjunction with the movement of the arm 54 described above, and stably supports the actuation body 56.

Actuator 56 and arm 5 supporting it
Reference numerals 4 and 61 are provided in correspondence with the number of elevator rails to be cut. In this embodiment, twelve actuating bodies 56 and arms 54 and 61 are provided. When the width dimension of the table 14 is large, these driving means can be appropriately divided and provided. In this embodiment, the driving means is divided into two parts from the center in the width direction, and one cylinder 44 is provided for each of them. Thus, the six actuating members 56 are simultaneously operated. In this case, a drive control device (not shown) for operating each cylinder 44 in synchronization is required.

Referring further to FIGS. 4 and 5, a cylinder 64 is built in each actuating body 56, and racks 68, 68 formed on both side surfaces of the tip end portion of the piston rod 66 thereof.
The pinions 70 and 70 are engaged with each other. Arms 74 and 74 are connected to the rotary shafts 72 and 72 of the pinions 70 and 70, respectively, and clamp pins 76 and 76 are attached to the inner surfaces of the ends of the arms facing each other.

Therefore, by hydraulically operating the cylinder 64 in the direction for retracting the piston rod 66, the pinions 70, 70 and the arms 74, 74 rotate in the directions shown in the figure, and the clamp pins 76, 76 come close to each other. To do. Thus, both side surfaces 3, 4 of the elevator rail 1 are clamped by these clamp pins 76, 76,
Positioned. Naturally, the piston rod 6
The position of each operating body 56 is set in advance so that the central axis 67 of 6 coincides with the center line between the side surfaces 3 and 4 of the elevator rail 1 and both inclined surfaces 5 and 6 to be cut. In addition, since the cylinder 64 of each actuating member 56 is actuated in synchronization by the drive control device, the front ends of all the elevator rails 1 can be accurately centered simultaneously by the above positioning.

In FIG. 5, reference numeral 14a indicates the front end face of the table 14.

The second centering device or rear end centering device 38 is the front end centering device 3 described above.
6 has the same structure as that of Table 6, but has a table 14 in a symmetrical direction.
It is installed in contact with the rear end portion (the left end in FIG. 1). Similarly, the rear end centering device 38 simultaneously and accurately centers the rear ends of the elevator rails 1 mounted on the electromagnetic magnet chuck 32.

The third centering device is provided for sequentially centering several intermediate portions of each elevator rail 1 whose front and rear ends are accurately centered by the first and second centering devices 36 and 38. Used.

As shown in FIGS. 6 and 7, the third centering device, that is, the intermediate centering device 80, is mounted so as to be lifted and lowered by a cylinder 82 provided at the front end of the cross beam 18 in the planing machine 10. It has a plate 84. The figure shows a state in which the mounting plate 84 is descending to the lowermost position, and in this position centering of the elevator rail center portion described later is performed.

On the front surface of the mounting plate 84, a number of actuators 86 corresponding to the number of elevator rails 1 to be cut, that is, 12 actuators 86 in this embodiment are mounted.

A cylinder 88 is built in each actuating body 86, and a pinion 94, 94 is provided on a rack (not shown) formed on both side surfaces of the tip portion of the piston rod 90 of the cylinder 88, respectively.
Are meshed. Arms 98 and 98 are connected to the rotating shafts 96 and 96 of these pinions, respectively, and clamp rollers 100 and 100 are attached to the inner surfaces of the ends of the arms which face each other. The structure for actuating the clamp roller via the engagement between the rack and the pinion is the same as that of the actuating member 56 of the front end centering device 36 shown in FIG.

Thus, hydraulically operating the cylinder 88 to raise the piston rod 90 causes the pinions 94, 94 and arms 98, 98 to move the clamp rollers 100, 100 closer to each other from the position shown in FIG. To rotate in the opposite direction.

Therefore, both side surfaces 3 of the elevator rail 1,
4 is clamped and positioned by these clamp rollers 100, 100. The position of each actuating body 86 is set in advance so that the central axis 91 of the piston rod 90 coincides with the center line between the cutting tools 20, 20 for cutting both side surfaces 3, 4 and both inclined surfaces 5, 6 of the elevator rail 1. Further, since the cylinder 88 in each actuating body 86 is actuated in synchronization with each other by the drive control device, the predetermined central portion of all the elevator rails 1 can be accurately centered simultaneously by the above positioning.

Reference numeral 102 is a chip removing device, which is attached to the cross beam 18 in front of the unit 22.

This chip removing device 102 is, as shown in FIG. 8, a pressing plate 106 connected to a rod 103 hanging from the cross beam 18 via a spring 104.
Further, a skirt-shaped wiper 108 and a pair of strip-shaped wipers 110 and 112 are attached. The rod 103 is used to remove chips and cutting fluid after cutting with the cutting tool 20.
When the table 14 descends from the cross beam 18, these wipers 108, 110, 112 are pressed against the upper surfaces of the electromagnetic magnet chuck 32 and the iron plate 34, and as the table 14 advances in the direction indicated by the arrow F in the figure. Bucket 24 that guides chips and cutting fluid and is provided behind the table
(Fig. 1) Discharge into the inside. As is clear from the above description, since the upper surfaces of the electromagnetic magnet 32 and the iron plate 34 are completely flat and have no irregularities, the removal of chips and cutting fluid with these wipers is extremely efficient and easy. Be seen.

The wiper 108 mainly removes cutting fluid, and the wipers 110 and 112 mainly serve to remove chips. As shown in FIG. 9, the wipers 110 and 112 have a wing shape so that both side parts thereof are retracted with respect to the table advancing direction F, so that the chips are carried to the bucket 24 while being converged in the central direction.

The operation of the centering device 30 according to this embodiment will be described below.

A predetermined number (12 in this embodiment) of works of the elevator rail 1 are placed on the table 14 of the planing machine 10.
More precisely, they are placed side by side on the electromagnetic magnet chuck 32 and the iron plate 34. The elevator rails 1 need to be juxtaposed at predetermined positions and at predetermined intervals for high-precision cutting by the unit 22, but this is achieved by the centering device 30 described later, so at this point, approximate positioning is achieved. Just go.

Next, the first and second centering devices 36 and 38 are operated to center the front and rear ends of each elevator rail 1. Since the operations of the front end centering device 36 and the rear end centering device 38 are symmetrical, the front end centering device 36 will be described below. At this point, the front end centering device 36 in the storage position shown by the phantom line in FIG. By hydraulically operating the cylinder 44 to extend the piston rod 46 and rotating the arm 54 (and the auxiliary arm 62) counterclockwise (FIG. 3) through the engagement between the rack 48 and the pinion 50. The operating position is shown by the solid line in FIG. As a result, the cover 42 is opened, the actuating body 56 provided corresponding to each elevator rail is lifted, and the clamp pins 76, 76 at the tip thereof project onto the first magnet chuck 32a, and the front end portion of each elevator rail is Both side surfaces 3 and 4 are sandwiched (FIGS. 3 and 4).

In this state, the cylinders 64 of the respective actuating bodies 56 are simultaneously hydraulically actuated, and the piston rods 6
By retracting 6 (FIGS. 4 and 5), the clamp pins 76, 76 rotate in a direction in which they approach each other, and both side surfaces 3, 4 of the front end of the elevator rail are clamped.

As described above, each elevator rail 1
The front end of is clamped in the centering state on the first magnet chuck 32a.

Similarly, the rear end centering device 38 is also operated, and the rear end of each elevator rail is clamped in the centering state on the sixth magnet chuck 32f.

Next, the magnet chucks 32a, 32
By magnetizing f, the clamped front and rear end portions of each elevator rail 1 are attracted and fixed onto these magnet chucks 32a and 32f.

After fixing the front and rear end portions of each elevator rail 1 to the centering state in this way, the third intermediate portion centering device 80 is operated to sequentially perform centering for a predetermined intermediate portion of each elevator rail 1. To do. This work is performed as follows.

First, the cylinder 82 is hydraulically operated to lower the intermediate centering device 80 to the position shown in FIG.
Move the table 14 in the direction of arrow F from the position in FIG.
The table 14 is stopped when the second magnet chuck 32b reaches directly below the intermediate centering device 80.

At this position, the center centering device 8
When the cylinder 88 built in each actuating body 86 at 0 is hydraulically operated at the same time to retract the piston rod 90,
The clamp rollers 100, 100 rotate in a direction in which they approach each other, and are pressed against both side surfaces 3, 4 of each elevator rail 1. By magnetizing the magnet chuck 32b in this state, the elevator rail portion on the second magnet chuck 32b is centered.

Next, the third magnet chuck 32c
The table 14 is moved so that is positioned directly below the intermediate centering device 80. Then, in the same manner, the elevator rollers on the third magnet chuck 32c are centered by the clamp rollers 100, 100.

Similarly, the fourth magnet chuck 32 will be described below.
Centering work is sequentially performed on d and the portion on the fifth magnet chuck 32e.

For each actuating body 86 in a state of clamping both side surfaces 3 and 4 of each elevator rail 1 on the second magnet chuck 32b, the centering work for the portion on the fifth magnet chuck 32e is completed. It is maintained in this clamped state until. As a result, each elevator rail 1 is automatically centered even when it is not on the magnet chuck when the intermediate centering device 80 is moved, thereby preventing the elevator rails from being placed in a meandering state. Clamp roller 10
0 is a member that rotates freely, and is useful for smoothing the relative movement of the operating body 86 with respect to the elevator rail 1.

As described above, first of all, the front end portion and the rear end portion of each elevator rail are centered by the front end centering device 36 and the rear end centering device 38 at the same time. The predetermined centering work is completed by sequentially performing the centering work in the middle part by the middle part centering device 80.

After the centering work is completed, the front end centering device 36 and the rear end centering device 38 are set to the storage positions shown by phantom lines in FIG. Due to the hydraulic operation of the cylinder 82, the cylinder 82 is lifted and retracted to a position where it does not interfere with the cutting work.

Since the cutting work by the cutting tool 20 of the planing machine 10 is the same as the conventional one, its explanation is omitted.

The chips produced as a result of the cutting operation by the cutting tool 20 are guided to the rear of the table 14 by the chip removing device 102 having two kinds of wipers 108, 110 and 112, and discharged to the bucket 24. During the cutting operation, both the front end centering device 36 and the rear end centering device 38 are in the storage position, the cover 42 is closed, and the electromagnetic magnet chuck 32 and the iron plate 34 on the table 14 are completely flush with each other. Therefore, there is no unevenness that interferes with the discharge work of the chips and cutting fluid by the wiper, and smooth removal is guaranteed.

[0069]

According to the present invention, since the centering work of the elevator rail to be cut is efficiently performed, it is possible to perform the required high precision cutting.

The front end portion and the rear end portion of each elevator rail which are juxtaposed on the table are simultaneously centered by the front end centering device and the rear end centering device. Since the rear end centering device is flush with the table after the centering work is completed, there is no protrusion on the table during the cutting work, and the work of removing chips and the like is smoothly performed.

Further, the center centering device for centering the middle part of each elevator rail is attached to the cross beam of the planing machine so as to be able to move up and down, and after the completion of the centering work, it retreats upward and interferes with the cutting work. Never be.

Accurate positioning is achieved because the centering work is performed with reference to both side surfaces of the elevator rail itself, which requires high-precision cutting.

It can be commonly used for centering work of various rails without the need to replace parts, is excellent in versatility, and can reduce product cost.

[Brief description of drawings]

FIG. 1 is a front view showing a centering device according to an embodiment of the present invention together with a planing machine used in connection therewith.

2 is a side view of the device of FIG. 1. FIG.

FIG. 3 is a front view showing a configuration of a front end centering device in the centering device.

FIG. 4 is a partially cutaway view showing a configuration of an operating body in the front end centering device of FIG.

5 is a top view showing details of the configuration of the operating body of FIG. 4 and a positional relationship between the operating body and a table and an elevator rail.

FIG. 6 is a front view showing the configuration of an intermediate centering device in the centering device.

FIG. 7 is a partial front view of the intermediate centering device of FIG.

FIG. 8 is a front view showing a configuration of a chip removing device in the centering device.

9 is a top view showing the shape of the wiper in the chip removing device of FIG. 8. FIG.

FIG. 10 is a cross-sectional view showing a shape of an elevator rail to be a target of centering work and cutting work.

FIG. 11 is a side view schematically showing an example of a conventional centering method.

FIG. 12 is a plan view schematically showing the conventional example of FIG.

FIG. 13 is a schematic view showing another example of a conventional centering method.

[Explanation of symbols]

 1 Elevator Rail 10 Planing Machine 14 Table 20 Bit 30 Centering Device 32 Electromagnetic Magnet Chuck 36 (First) Front End Centering Device 38 (Second) Rear End Centering Device 42 Cover 44 Cylinder 56 Actuator 64 Cylinder 76 Clamp Pin 80 (Third) Center Part Centering Device 82 Cylinder 86 Actuator 88 Cylinder 100 Clamp Roller 102 Chip Removal Device

Claims (11)

[Claims] 1. A plurality of electromagnetic magnet chucks arranged on a table of a planing machine, and portions of rails arranged on the electromagnetic magnet chuck perpendicular to the electromagnetic magnet chucks in the longitudinal direction of the table. And a centering device for positioning the rail at a predetermined axial center position, and by magnetizing an electromagnetic magnet chuck below the rail positioned by the centering device, the rail is attracted and fixed at that position. Rail centering device for planing machines. 2. The centering device comprises an elevating member capable of ascending / descending above a table, a clamp means for sandwiching both side surfaces of the rail when the elevating member is descending, and a clamp means for activating the rail. 2. The centering device according to claim 1, further comprising actuating means for clamping and centering both side surfaces. 3. The centering device is provided on a cross beam of a planing machine, and each electromagnetic magnet chuck on a table moving in a longitudinal direction performs centering at a position directly below the centering device. Item 2. The centering device according to item 2. 4. The centering device is provided on a movable body that is movable in the longitudinal direction of the table, and stops at a position above each electromagnetic magnet chuck to center the corresponding portion of the rail. Centering device. 5. A front end centering device for centering a front end of a rail on an electromagnetic magnet chuck near a front end of a table, the centering device comprising:
7. A rear end centering device for centering a rear end part of a rail on an electromagnetic magnet chuck near a rear end of a table, and an intermediate part centering device for centering an arbitrary number of predetermined intermediate parts. 1. Centering device. 6. The openable and closable cover, wherein the front end centering device and the rear end centering device are respectively provided in contact with the front end and the rear end of the table, and are flush with the upper surface of the electromagnetic magnet chuck in the closed state. Clamping means for protruding to a position where the front end portion and the rear end portion of the rail are sandwiched by protruding above the electromagnetic magnet chucks on the front end side and the rear end side in a state where the cover is opened,
6. The centering device according to claim 5, further comprising an operating means for operating the clamp means to clamp and center the front and rear ends of the rail. 7. The intermediate centering device includes an elevating member capable of ascending / descending above a table, a clamp means for sandwiching both side surfaces of a rail when the elevating member descends, and actuating the clamp means. 7. A centering device according to claim 5, further comprising an actuating means for clamping and centering both side surfaces of the rail. 8. The centering device is provided on a cross beam of a planing machine, and each electromagnetic magnet chuck on a table moving in the longitudinal direction is centered at a position directly below the centering device. The centering device according to claim 7, wherein the centering device is a centering device. 9. The center centering device is provided on a movable body that is movable in the longitudinal direction of the table, and stops at a position above each electromagnetic magnet chuck to center that portion of the rail. 7. Centering device. 10. The front end and rear end centering devices are simultaneously operated to simultaneously clamp and center the rail front end and rear end, and then the front end side and rear end side electromagnetic magnet chucks are magnetized. Adsorbing and fixing the front and rear ends of the rail by means of, then operating the intermediate centering device to clamp and center a predetermined intermediate portion of the rail, and then magnetize the electromagnetic magnet chuck at the intermediate position. The centering device according to any one of claims 5 to 9, wherein the centering device is actuated so as to adsorb and fix the middle part of the rail. 11. The centering device according to claim 5, further comprising a wiper for removing chips and cutting fluid generated during cutting.