JPH06226504A - Bar feeder - Google Patents

Abstract

PURPOSE:To facilitate the location and feed of a bar inserted in a spindle by inserting a barlike stopper movably forward and backward and radially into an axial slit formed in the side wall of the spindle and making this stopper move in the direction of the axis of the spindle by a moving mechanism. CONSTITUTION:After a spindle 22 is stopped in a fixed phase to locate a slit 22x right below a slit detecting sensor 28, a lift cylinder 13 of a stopper moving mechanism 10 is extended to insert a barlike stopper 19 into respective slits 22a, 22x of the spindle 22 and drive tube 25t. Next, a movable frame 18 is moved in the direction of the axis of the spindle 22 by the rotation of a ball screw 16 with a movable motor 16m to locate the stopper 19 in a predetermined position. Then, a barlike workpiece 2 is inserted into a drive tube 25t forced to abut against the stopper 19 by a press mechanism 40. Then, the workpiece 2 is clamped by a chuck 26 and the spindle 22 is rotated to work the workpiece 2 while the stopper 19 is withdrawn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stores a rod to be processed in a spindle through hole formed in a spindle of a machine tool, and stores the rod to be processed in the through hole of the spindle in the axial direction of the spindle. To a bar feeder to send to.

[0002]

2. Description of the Related Art A related art relating to this is disclosed in Japanese Patent Laid-Open No. 2-9.
It is described in Japanese Patent No. 5501. The bar feeder described in this publication is provided with a guide rail for horizontally supporting the bar to be processed, and a feed arrow for feeding the bar to be processed in the axial direction along the guide rail. There is. Then, this bar material feeder is installed behind a main shaft such as a lathe. Here, when the bar to be processed is set on the guide rail of the bar feeder, the axis of the bar to be processed is substantially coincident with the center line of the spindle through hole formed in the spindle. To feed the bar to be processed to the spindle, the feed arrow is moved in the direction of the spindle by a predetermined distance. As a result, the bar to be processed is sent out in the axial direction along the guide rail, and the bar to be processed is inserted from the rear into the spindle through hole and positioned at a predetermined position.

[0003]

However, the above-mentioned rod feeder has a structure for feeding the rod to be processed from the rear to the main shaft of a lathe or the like. Therefore, a space for installing the bar feeder and a space for advancing and retracting the feed arrow are required behind the main shaft. That is, there is a problem that the total length of the machine tool becomes long because the bar feeders are arranged in series with the main shaft. The technical problem of the present invention is to enable the bar feeders to be arranged in parallel with the main shaft, thereby making the total length of the machine tool shorter than before and effectively utilizing the equipment space. is there.

[0004]

The above-mentioned problems can be solved by a bar feeder having the following features. That is, the rod feeder according to the present invention stores the rod to be processed in the spindle through hole formed in the spindle of the machine tool, and the rod to be processed stored in the spindle through hole has the shaft center of the spindle. In a rod feeding device for feeding in the direction, a slit formed in the side wall of the spindle, which is a gap-shaped opening for communicating the spindle through hole with the outside, and a slit arranged in parallel with the spindle through hole, A rotation stop mechanism that stops the rotation of the main shaft, a rod-shaped stopper formed into a size that can pass through the slit, and the slit are fixed by the rotation stop mechanism so that the position of the slit becomes a fixed position in the rotation direction. The stopper may be inserted into the spindle through hole from the slit while being positioned at a position, and the stopper may be moved by a predetermined distance along the slit. And a cut stopper moving mechanism.

[0005]

According to the present invention, in order to feed the rod to be processed in the axial direction of the spindle, first, the rotation of the spindle is stopped by the rotation stopping mechanism so that the position of the slit becomes a fixed position. In this state, the stopper moving mechanism is operated to insert the stopper into the inside of the spindle through hole from the slit, and further move the stopper to a predetermined position. Next, the bar to be processed is inserted into the main shaft through hole from the front of the main shaft (on the side of the blade of the machine tool), and the end of the bar to be processed is brought into contact with the stopper. Then, the stopper moving mechanism is actuated again to move the stopper forward along the slit by a predetermined distance, so that the bar to be processed can be fed in the axial direction of the main shaft. Here, since the slit is formed in the side wall of the spindle, the stopper is inserted into the spindle through hole in a direction intersecting with the spindle, that is, from the side of the spindle. For this reason, it becomes possible to arrange the bar material feeder side by side with the main shaft. For example, if the rotation of the main shaft is stopped so that the slit always points downward, the bar feeder can be installed below the main shaft.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A bar feeder according to an embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 shows a main shaft 22 of a lathe 20 and a stopper moving mechanism 1 of a bar feeder.
2 is a side view showing a positional relationship with 0, FIG. 2 (A) is a view taken along the line II-II of FIG. 1, and FIG. 2 (B) is a spindle 22 of the lathe 20.
FIG. 3 is a front view showing a positional relationship between the stopper moving mechanism 10 and the stopper moving mechanism 10. Further, FIG. 3 shows a lathe 20 and a stopper moving mechanism 1.
It is a side view (A) and a front view (B) showing the whole 0. The main shaft 22 of the lathe 20 has a main shaft through hole 2 extending in the central axis direction.
It is a columnar member formed with 2k, and both ends of the outer surface thereof are supported by the bearing member 22j via bearings 22b. Further, the bearing member 22j is the main shaft 2
2 is fixed to the headstock 24 while being held horizontally. A pulley 22p is coaxially fixed to the rear end surface (the left end surface in FIG. 1) of the main shaft 22, and the rotational force of the main shaft motor 22m is transmitted to the pulley 22p via a belt 22f. . Here, the spindle motor 22
An encoder (not shown) is attached to m, and the rotation angle of the motor rotation shaft, that is, the main shaft 22 indirectly.
The rotation angle of can be detected. The output of the encoder is input to a control device (not shown).

Further, a chuck 25 for gripping a bar 2 to be processed (hereinafter referred to as a work 2) is coaxially attached to the tip end surface (right end surface in FIG. 1) of the main shaft 22. As shown in FIG. 1 and FIG. 2B, the chuck 25 has four claws 25h that abut the outer surface of the work 2 from the radial direction to fix the work 2, and these claws 25h.
A cylindrical drive tube 2 for moving h in the radial direction
It is equipped with 5t. With the center line of the drive tube 25t aligned with the inside of the spindle through hole 22k,
In addition, it is housed in a state where movement in the axial direction is allowed.

A hook-like member 25a having an inclined surface 25s is fixed to a tip portion (right end in FIG. 1) of the drive tube 25t at a position facing each of the claws 25h. On the other hand, the inclined surface 2 of the hook-shaped member 25a is also provided at the end of the claw 25h.
An inclined surface 25k having an equal inclination is formed at a position facing 5s. Then, the drive tube 25t is displaced forward (to the right in FIG. 1), the inclined surface 25s of the hook 25a contacts the inclined surface 25k of the claw 25h, and the inclined surface 25k of the claw 25h is centered. When pressed in the direction, the claw 25h is moved by the action of the inclined surface 25k.
5 is displaced toward the center. That is, the four claws 25h are displaced in a direction in which they approach each other, and the work 2 is gripped. On the contrary, when the driving tube 25t is displaced rearward and the inclined surface 25s of the hook-shaped member 25a is separated from the inclined surface 25k of the claw 25h, the four claws 25h are displaced by the force of the springs 25c. The grip of the work 2 is released.

A ring plate 26r is provided at the rear end portion (left end in FIG. 1) of the drive tube 25t through a bearing 25b.
Is rotatably connected to the drive tube 25t. The piston rod 27p of the chuck cylinder 27 is connected to the ring plate 26r.
It should be noted that the chuck cylinder 27 is attached to the headstock 24 by the spindle 2
It is fixed coaxially with 2. With this structure, when the chuck cylinder 27 is driven, the drive tube 25t is displaced in the axial direction, and the four claws 25h move in the radial direction. Further, since the drive tube 25t is supported by the ring plate 26r via the bearing 25b, the drive tube 25t can also rotate together with the main shaft 22 when the main shaft 22 rotates.

As shown in FIGS. 1 and 2A, the main shaft 22 is provided with a slit 22x. The slit 22x is formed in the side wall of the main shaft 22 and is a gap-shaped opening that communicates the main shaft through hole 22k with the outside and is arranged in parallel with the main shaft through hole 22k. Further, two slits 22x are formed at positions facing each other with the center line of the main shaft 22 interposed therebetween. Also, the chuck 25
Also in the drive tube 25t of the slit 22 of the main shaft 22
A slit 25x is formed at a position facing x.
Further, a slit detection sensor 28 is attached to the bearing member 22j of the main shaft 22. The slit detection sensor 28 is arranged right above the main shaft through hole 22k, and a slit detection signal can be output at the timing when the slit 22x passes right below the sensor 28. Then, the output signal of the slit detection sensor 28 is input to the control device. Here, as the slit detection sensor 28, a proximity sensor, a photoelectric sensor, or the like is preferably used.

A spindle motor 22 for rotating the spindle 22.
The constant m is stopped by the control device so that the main shaft 22 stops at a position where the main shaft 22 makes one further rotation from the timing when the slit detection sensor 28 detects the slit 22x. Therefore, when the main shaft 22 is stopped, the slit 22x is always positioned immediately below the slit detection sensor 28. That is, the slit 22x is always positioned vertically. Thus, the spindle motor 22m, the slit detection sensor 28, and the control device correspond to the rotation stopping mechanism of the present invention.

A stopper moving mechanism 10 is installed just below the main shaft 22. The stopper moving mechanism 10
Is provided with a gantry 12, and an elevating cylinder 13 is vertically fixed to the center of the gantry 12. The lifting cylinder 13 is a cylinder for lifting and lowering the surface plate 14,
The platen 14 is fixed to the tip of the piston rod 13p. A guide rod 14r is vertically fixed to the lower surface of the surface plate 14 with the piston rod 13p interposed therebetween, and the guide rod 14r is slidably inserted into a bush 12b mounted on the mount 12. . A pair of bearing mounts 15 are fixed on the upper surface of the surface plate 14 in the axial direction of the main shaft 22.
Both ends of the ball screw 16 are rotatably supported by the bearing 5b. The ball screw 16 is arranged so that its plane position coincides with the axial center of the main shaft 22, and a pulley 16p is coaxially fixed to the tip portion (right end in FIG. 1) of the ball screw 16. A moving motor 16m for rotating the ball screw 16 is mounted on the surface plate 14, and a motor rotating shaft of the moving motor 16m is connected to a pulley 16p of the ball screw 16 via a belt 16f. . Here, the moving motor 16
Since an encoder (not shown) is attached to m, the rotation angle of the motor rotation shaft can be detected.

Guide rails 17 are attached to the lower portions of the pair of bearing mounts 15 in parallel with the ball screws 16. The lower slider 18d of the movable frame 18 is engaged with the guide rail 17 so as to be movable along the guide rail 17. A nut 18n is fixed to the center of the upper portion of the movable frame 18, and the nut 18n is screwed with the ball screw 16. With this structure, when the ball screw 16 is rotated in the forward direction or the reverse direction by the moving motor 16m, the moving mount 18 moves back and forth between the bearing mounts 15 by the screw action. A rod-shaped stopper 19 is vertically fixed to the upper surface of the movable mount 18 at a position coinciding with the axis of the main shaft 22. Here, the stopper 19
Is smaller than the gap between the slit 22x formed in the main shaft 22 and the slit 25x formed in the drive tube 25t. Therefore, when the lifting cylinder 13 raises the surface plate 14 of the stopper moving mechanism 10 while the main shaft 22 is stopped, the stopper 19 passes through the slits 22x and 25x and is inserted into the drive tube 25t. To be done. In this state, when the ball screw 16 is rotated by the moving motor 16m, the stopper 19 moves in the axial direction inside the drive tube 25t along the slits 22x and 25x.

As shown in FIG. 3, a cutting tool moving unit 30 for moving a cutting tool 32 is arranged above and above the main shaft 22, and a work pressing unit is provided at a position facing the front surface of the main shaft 22. A mechanism 40 is arranged. The work pressing mechanism 40 includes a horizontal cylinder 42 and a pressing cylinder 44. The horizontal cylinder 42 is arranged at the same height as the main shaft 22 at a right angle to the main shaft 22, and a pressing cylinder 44 is fixed to the tip of the piston rod 42p. In addition, the pressing cylinder 4
4 is arranged at the same height as the main shaft 22 and parallel to the main shaft 22. Then, the horizontal cylinder 42
The pressing cylinder 44 moves horizontally by a predetermined distance, so that the axis of the pressing cylinder 44 coincides with the axis of the main shaft 22. A pressing plate 44b for pressing the work 2 in the axial direction is attached to the tip of the piston rod 44p of the pressing cylinder 44.

Next, a procedure for supplying the work 2 by the bar material feeder according to this embodiment will be described. First, the spindle 2
Stop the rotation of 2. At this time, as described above, in the spindle motor 22m, when the slit detection sensor 28 detects the slit 22x, the spindle 22 is further moved to the 1st position.
A constant phase stop is performed by the controller to stop at the rotated position. Therefore, when the main shaft 22 is stopped, the slit 22x is always positioned immediately below the slit detection sensor 28. That is, the slit 22x is always positioned vertically. In this state, the lift cylinder 13 of the stopper moving mechanism 10 is driven in the direction in which the piston rod 13p is extended, and the surface plate 1
4, the rod-shaped stopper 19 moves from below to the slit 22x of the main shaft 22 and the drive tube 25.
It is inserted into the slit 25x of t. Then, with the tip of the stopper 19 being housed inside the drive tube 25t, the rise of the surface plate 14 is stopped.

Then, the moving motor 16m is driven, and the moving base 18 moves in the axial direction of the main shaft 22 following the ball screw 16 and the guide rail 17 by the screw action of the ball screw 16 and the nut 18n. by this,
The tip of the stopper 19 also moves inside the drive tube 25t along the slits 22x and 25x. Then, when the stopper 19 is positioned at a predetermined position, the work 2 is inserted into the drive tube 25t from the front of the main shaft 22. Next, the work pressing mechanism 40
The horizontal cylinder 42 is driven to align the axis of the pressing cylinder 44 with the axis of the main shaft 22. Further, when the pressing cylinder 44 is driven in the direction in which the piston rod 44p is extended, the pressing plate 44b attached to the tip of the piston rod 44p presses the work 2 in the axial direction, so that the end of the work 2 ends. The portion abuts on the tip of the stopper 19. As a result, the work 2 is positioned at the predetermined position. Then, in this state, the chuck cylinder 27 is driven in the direction in which the piston rod 27p is extended, and the drive tube 25t is displaced forward, whereby the four claws 25h are displaced in the central direction and the work 2 is chucked. Two
It is grasped by 5.

When the work 2 is gripped by the chuck 25, the work pressing mechanism 40 is returned to its original state, and the elevating cylinder 13 of the stopper moving mechanism 10 is driven in the direction for accommodating the piston rod 13p, so that the work is fixed. The board 14 descends. As a result, the rod-shaped stopper 19 causes the slit 25x of the drive tube 25t and the slit 2 of the main shaft 22.
It is pulled out from 2x. Next, the spindle 22 is rotated by the spindle motor 22m, and the cutting tool 32 is moved by the cutting tool moving unit 30 according to the shape of the product, whereby the work 2 is cut. In this way, when the first machining of the work 2 is completed, the work 2 is further forwarded by a predetermined size, and the next machining is performed.

In order to feed the work 2 forward by a predetermined size, first, the chuck cylinder 27 is operated to move the work 2
Release the grip. Next, the platen 14 is raised and the stopper 19 is inserted into the drive tube 25t through the slits 22x and 25x. In this state,
By driving the moving motor 16m, the stopper 19 is moved forward by a predetermined dimension along the slits 22x and 25x. As a result, the work 2 is pushed by the stopper 19 and sent forward by a predetermined dimension. Next, by pressing the work 2 in the axial direction by the work pressing mechanism 40, the end of the work 2 is surely brought into contact with the stopper 19, and the work 2 is gripped by the chuck 25. The subsequent cutting process is as described above. As described above, in the bar material feeder according to the present embodiment, the stopper 19 is inserted from below the main shaft 22 into the main shaft through hole 2.
The work 2 can be supplied by inserting it into 2k and moving it in the axial direction. Therefore, the stopper moving mechanism 10 can be installed under the main shaft 22, and the total length of the lathe 20 can be made shorter than before.

[0019]

According to the present invention, since the rod to be processed can be fed from the side of the spindle, the rod feeder can be installed side by side with the spindle. As a result, the total length of the machine tool is shorter than before, and the equipment space can be effectively used.

[Brief description of drawings]

FIG. 1 is a side view of a stopper moving mechanism of a bar feeder according to an embodiment of the present invention.

FIG. 2 is a front view of a stopper moving mechanism of the bar feeder according to the embodiment of the present invention.

FIG. 3 is a diagram showing a positional relationship between a lathe and a stopper moving mechanism.

[Explanation of symbols]

 2 Workpiece rod 10 Stopper moving mechanism 19 Stopper 22 Spindle 22k Spindle through hole 22x Slit 22m Spindle motor (rotation stop mechanism) 25x Slit 28 Slit detection sensor (rotation stop mechanism)

Claims (1)

[Claims] 1. A bar material feeder for accommodating a workpiece bar material in a spindle through hole formed in a spindle of a machine tool and for feeding the processed bar material accommodated in the spindle through hole in the axial direction of the spindle. In the slit formed in the side wall of the spindle, which is a gap-shaped opening that communicates the spindle through hole with the outside, the slit arranged in parallel with the spindle through hole, and the position of the slit in the rotation direction. A rotation stop mechanism for stopping the rotation of the main shaft so as to be in a fixed position, a rod-shaped stopper formed into a size that can pass through the slit, and a state in which the slit is positioned at a fixed position by the rotation stop mechanism. A stopper capable of inserting the stopper from the slit into the spindle through hole and further moving the stopper along the slit by a predetermined distance Bar feeder, characterized in that it comprises a kinematic mechanism.