JPH028676Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention allows the tool mounted on the spindle and the tool gripped by the magazine disk of the tool magazine to be directly connected by relative movement between the spindle head and the tool magazine. This article relates to a machine tool tool magazine that is exchangeable.

[Prior art]

This type of tool magazine is directly supported by a frame installed on the bed of the machine tool, and the spindle head is moved in a first direction toward and away from the magazine disk, and in a second direction parallel to the spindle. The tool holder with the tool attached to it can be replaced.

[Problem that the invention attempts to solve]

However, in such conventional technology, if an excessive stroke is accidentally given to the spindle head during adjustment of the machine tool, or if the control device goes out of control due to an abnormal signal during tool exchange, etc. There was a problem that either or both of them could be damaged. The present invention is designed to prevent the tool magazine from being damaged by retracting in such a case.

[Means for solving problems]

For this purpose, the tool magazine for a machine tool according to the present invention includes a support stand 30 supported by a frame 18 erected on the bed 10 of the machine tool, and a tool magazine for a machine tool according to the present invention, as illustrated in the embodiment of the attached drawings. A magazine disk 35 is pivoted parallel to the main shaft 15 of the machine and indexed and rotated, and a magazine disk 35 is provided on the magazine disk 35 so as to protrude in the radial direction at intervals in the circumferential direction, and is removable at each tip. tool holder 3
7, and includes a plurality of gripping devices 36 for gripping the magazine disc 35, and a first direction parallel second direction Z
In a tool magazine of a machine tool in which the tool holder mounted on the main spindle 15 is replaced with the tool holder gripped by the gripping device 36 by moving to,
The frame 18 is provided with the first and second directions X,
A base 20 that is slidably supported in one direction of Z and slidably supports the support base 30 in the other direction, and this base is connected to the frame 18.
The first spring 25 holds the reference position for
and a second spring 43 that holds the support stand 30 at a reference position with respect to the base stand 20, and is actuated by detecting that at least one of the base stand 20 and the support stand 30 has moved from the reference position. It is characterized by being equipped with a switch 28.

[Effect]

The spindle head 14 is arranged in a first direction X and a second direction Z.
The magazine disk 35 was rotated for indexing, and the tool holder attached to the main shaft 15 was returned to the empty gripping device 36 and was gripped by another gripping device 36. A predetermined tool holder is attached to the main spindle 15. Such operations are performed when adjusting the machine tool or during normal tool replacement, but if an excessive stroke is accidentally given to the spindle head 14 during adjustment, or if the control device goes out of control due to an abnormal signal during tool exchange, the spindle head 14
collides with the tool magazine M, in particular with the gripping device 36 indexed to the tool change position A. When such a collision occurs, the base 20 or the support 30 moves from its respective reference position in the first or second direction against the biasing forces of the first and second springs 25 and 43, At the same time, the switch 28 is activated.

[Effect of idea]

As described above, according to the present invention, when the tool magazine is collided with the spindle head, it automatically moves against the biasing forces of the first and second springs, so that there is no excessive force on the tool magazine and the spindle head. This prevents the application of excessive force and prevents damage due to collision, and at the same time, the movement of the rod toward the main shaft can be stopped by operating the switch. Further, after the cause of the collision is removed, the base 20 and the support 30 can be immediately returned to their reference positions by the biasing forces of the first and second springs.

〔Example〕

The embodiments shown in the accompanying drawings will be described below.

As shown in FIG. 7, the tool magazine M according to the present invention is supported by a frame 18 erected on the bed 10 of a machine tool. A column 12 is guided and supported in the horizontal Z direction perpendicular to the X direction and driven back and forth on the moving table 11, and a spindle head 14 is guided in the vertical Y direction on the column 12. It is supported and driven back and forth. The main shaft head 14 has a main shaft 15 parallel to the Z direction.
is pivotally supported and rotationally driven, and this main shaft 15 has a built-in locking device for removably attaching a tool holder 37 to which a rotary tool T is fixed.

As shown in FIGS. 1 to 3, the base 20 of the tool magazine M includes a bottom plate 21, a front plate 22, a side plate 23,
23a, and is guided and supported by a guide rail 18a fixed to the upper end of the frame 18 so as to be slidable in the Z direction parallel to the main shaft 15 (left and right in FIG. 1). A first spring 25 is interposed between the plate 24 fixed to the rear end of the rear extension plate 21a fixed to the bottom plate 21 and the plate 18b fixed to the rear end of the guide rail 18a, as shown in FIG. , biases the base 20 toward the reference position, which is the rearmost position in which it can slide. As shown in FIGS. 2 and 3, a micro switch 2 is fixed to the rear of the guide rail 18a via a bracket 26.
The actuator 8 is made engageable with a dog 27 provided on the plate 24, so that when the base 20 moves from its reference position against the spring 25, the micro switch 28 is activated. In order to avoid complicating the drawing, the micro switch 28 is not shown in Figure 1.
The entry is omitted.

As shown in FIGS. 1 to 3, the support plate 30a of the support base 30 is engaged with the guide grooves 22a, 22a of the front plate 22 of the base 20, and thus the support base 30 is connected to the main shaft 15 by the base 20. It is guided and supported so as to be slidable in the horizontal X direction (left and right direction in FIG. 2) perpendicular to the left and right directions. A rotating shaft 31 and a magazine disk 35 fixed to the front surface of the rotating shaft 31 are connected to the main shaft 15 on the support base 30.
It is pivotally supported around an axis parallel to , and index rotation is provided by an index drive motor 32 installed on a support base 30 . An encoder 33 for outputting a rotational phase signal of the magazine disk 35 is provided on the back side of the support base 30 in parallel with the index drive motor 32, and both 32 and 33 are connected to the front plate 22 as shown in FIG.
It protrudes rearward through a hollow hole provided in the. The dimensions of the hollow hole 22b are made large enough to allow the support stand 30 to move a considerable distance to the right (in the X1 direction, which will be described later) with respect to the front plate 22 from the reference position shown in FIG.

As shown in FIG. 4, a guide member 4 is provided on the front plate 22.
0 is fixed, and correspondingly, the support plate 30a of the support base 30 is provided with a notch member 41 having a conical recess 41a. A positioning latch 42 is slidably inserted into the guide member 40, and a second spring 43 is interposed between it and a screw plug 44 provided at the rear end of the guide member 40, so that the conical protrusion at the tip of the positioning latch 42 is inserted. The support base 30, which is engaged with the conical recess 41 of the notch member 41 and thereby guided and supported by the base 20, is held at the reference position shown in FIGS. 2 and 3.

As shown in FIG. 2, eight sets of gripping devices 36 are provided on the magazine disk 35 at equal intervals in the circumferential direction and projecting in the radial direction. Each gripping device 36 includes a fixed pawl 36a fixed to the magazine disk 35, and a movable pawl 36b which is provided to be openable and closable with respect to the fixed pawl 36a by a pivot shaft 36c and biased in the closing direction by a spring (not shown). Both claws 36a, 3
The tool holder 37 is removably gripped by sandwiching the groove 37b of the flange 37a of the tool holder 37, which fixes the rotary tool T (see FIG. 7) between the tip ends of the tool holder 6b.

When returning the tool holder 37 attached to the spindle 15 to the tool magazine M, first index the empty gripping device 36 to the tool exchange position A, and move the spindle head 14 to the Y position.
direction to be at the same height as the tool change position A,
Next, the tool holder 37 is moved in the Z direction to match the Z direction position of the groove 37b of the tool holder 37 mounted on the spindle head 14 with that of the gripping device 36. Next, as shown in FIG. 5, the spindle head 14 is moved in the X direction to approach the magazine disk 35, and as shown by the two-dot chain line,
The tool holder 37 is gripped by the gripping device 36. Next, after releasing the locking device built into the main shaft 15, the main shaft head 14 is moved to the main shaft 1 as shown in FIG.
If you move in the Z2 direction parallel to 5, the tool holder 37
is gripped by the gripping device 36 and pulled out from the main shaft 15. When mounting the tool holder 37 gripped by the gripping device 36 of the tool magazine M on the spindle 15, the gripping device 36 is indexed to the tool exchange position A, and the height of the spindle head 14 is made the same as the tool exchange position A. Afterwards, contrary to the above, the spindle head 14 is moved in the X direction to be coaxial with the tool holder 37, moved in the Z1 direction, and the tool holder 37 is inserted into the spindle 15 and attached by the locking device, and then The gripping device 36 may be removed by moving in the X2 direction.

When inserting the tool holder 37 gripped by the gripping device 36 into the spindle 15, if the spindle head 14 overstrokes in the Z1 direction due to erroneous operation or runaway, a force is generated that presses the gripping device 36 in the Z1 direction. This force causes the support stand 30 and the base stand 20 to move in the Z1 direction from the reference position relative to the frame 18 against the first spring 25. This movement prevents the gripping device 36, the spindle head 14, the tool magazine M, etc. from being subjected to an excessive force greater than the biasing force of the first spring 25, and the micro switch 28 is activated to stop the movement of the spindle head 14. be done. If the cause of the overstroke is removed and the spindle head 14 is moved back in the Z2 direction, the support stand 3
0 and the base 20 are immediately returned to their reference positions by the first spring 25, allowing normal operation.

If the spindle head 14 overstrokes in the X1 direction due to erroneous operation or runaway when the tool holder 37 attached to the spindle 15 is gripped by the gripping device 36, a force is generated that presses the gripping device 36 in the X1 direction. This force causes the support stand 30 to move from the reference position relative to the base stand 20 against the second spring 43.
Move in the X1 direction. This movement causes the gripping device 3 to
6. The second part is attached to the spindle head 14 and tool magazine M, etc.
Application of an excessive force greater than the biasing force of the spring 43 is avoided. In this case, since the gripping device 36 grips the tool holder 37 near the end of the stroke of the spindle head 14 in the The control device built into the machine operates and the X1 of the spindle head 14
The direction stroke stops. After removing the cause of the overstroke, the main shaft head 14 is moved back in the X2 direction, and the second spring 43 engages the conical protrusion at the tip of the positioning latch 42 with the conical recess 41a of the notch member 41, thereby fixing the support base 30. Returning to the standard position allows normal operation.

Note that, like the base 20, the relief mechanism of the support base 30 is also biased toward the reference position by a spring, and the movement of the support base 30 with respect to the base 20 is detected by a micro switch, and the release mechanism of the headstock 14 is It is also possible to stop the movement of.

[Brief explanation of drawings]

The drawings show an embodiment of a tool magazine for a machine tool according to the present invention, and FIG. 1 is an overall side view, FIG. 2 is an overall rear view, FIG. 3 is an overall plan view, and FIG.
5 and 6 are explanatory views of the operation, and FIG. 7 is an overall side view of a machine tool equipped with the above embodiment. Explanation of symbols, 10...Bed, 14...Spindle head, 15...Spindle, 18...Frame, 20...
... base, 25 ... first spring, 28 ... switch, 30 ... support stand, 35 ... magazine disk,
36... Gripping device, 37... Tool holder, 43...
...Second spring, X...first direction, Z...second direction.

Claims (1)

[Scope of utility model registration request] A support stand supported by a frame erected on the bed of the machine tool, a magazine disk that is pivoted parallel to the main axis of the machine tool and indexed and rotated by this support stand, and A plurality of gripping devices are provided to protrude in the radial direction at intervals in the circumferential direction, and each of the gripping devices removably grips a tool holder at the tip thereof, and the gripping devices are arranged to index and rotate the magazine disk and to rotate the main shaft of the machine tool. By moving the head toward and away from the magazine disc in a first direction and in a second direction parallel to the main shaft, the tool holder mounted on the main shaft is replaced with the tool holder gripped by the gripping device. In a tool magazine for a machine tool, a base is slidably supported by the frame in one of the first and second directions and supports the support base slidably in the other direction. a base, a first spring that holds the base at a reference position with respect to the frame, a second spring that holds the support base at a reference position with respect to the base, and at least one of the base and the support base. A tool magazine for a machine tool, characterized in that it is equipped with a switch that operates upon detecting movement from its reference position.