JPH0214914Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to an improvement of a tool magazine device for a machine tool.

Prior Art When a magazine body for storing tools is provided with a pair of fixed pawls and a movable pawl that can be opened and closed, the tool holder can be attached and detached using a numerically controllable machine tool. That is, the spindle head of the machine tool moves to accommodate the tool holder inside the empty fixed claw and movable claw by movement based on its numerical control, and then goes to pick up a new tool holder from the magazine body. At this time, of the pair of fixed claws and movable claws, the movable claw is biased in the closing direction by a spring or the like, and when the tool holder is attached or detached, it resists the biasing force and opens, allowing the tool holder to be attached or detached. Allow.

However, when the magazine main body rotates, there is a risk that the tool holder held by the pair of fixed claws and the movable claw may fall due to displacement of the movable claws in the opening direction due to impact or the like. Therefore, appropriate retaining means, ie, locking means, is required for the movable claw portion.

Purpose of the invention and its solution Herein, the purpose of the invention is to provide a mechanical locking means for the movable claw part, to lock or unlock it using the movement of a numerically controllable machine tool, and to The purpose is to make it possible to omit the driving source.

Therefore, in the present invention, a lock shaft is provided at the rearward displacement position of the movable claw so that it can move forward and backward, and the forward and backward movement of this lock shaft is mechanically connected to the movement of the spindle head of a numerically controllable machine tool.

Configuration of the invention Hereinafter, the configuration of the invention will be specifically explained based on the drawings.

First, FIG. 1 shows a tool magazine device 1 of the present invention.
1 shows the overall configuration of a machine tool 2 equipped with. This machine tool 2 is controlled by numerical control, and includes a base 5 movable in the X-axis direction on a bed 4 in order to move the spindle head 3 in the X-, Y-, and Z-axis directions, and a base 5 mounted on the base 5. The main shaft housing 7 is provided with a column 6 movable in the Z-axis direction and a spindle housing 7 movable in the Y-axis direction. The main shaft 3a of the main shaft head 3 is connected to the main shaft housing 7.
The tool 8 is rotatably supported by.

On the other hand, a frame 9 is attached to one end of the bed 4.
The magazine body 10 is rotatably supported by. That is, this magazine body 10 has a triangular shape as a whole, and is rotatably supported by a shaft 11 in the Z-axis direction at the center. Note that this shaft 11 is rotated by an indexing drive device (not shown) as necessary when exchanging tools. The magazine body 10 holds a plurality of pairs of fixed claws 12 and a plurality of movable claws 13 along each side thereof.

FIGS. 2 and 3 show the fixed claw 12 and movable claw 13. The fixed claw 12 is
It is fixed to the magazine body 10, and the movable claw 13 is rotatably supported by a substantially central support pin 14 at a position corresponding to the fixed claw 12, and is always closed by a spring 15. biased in the direction. Note that a key 1 for positioning the tool 8 is provided between the fixed claw 12 and the movable claw 13.
6 is installed.

The magazine main body 10 slidably holds a lock shaft 17 in the Z-axis direction by a bearing tube 18 for each movable claw 13. This lock shaft 17 has a groove 19
It is prevented from coming off by a locking pin 20 that fits into the movable claw 13, and an unlocking part 21 made of a recess and a flat locking part 22 higher than the recessed part are integrally formed at a position corresponding to the rear end part of the movable claw 13. There is. Further, a knob 46 is provided at the tip of the lock shaft 17, and the lock shaft 17 can be moved manually. This lock shaft 17 is positioned by a click ball 45 or the like in the forward or backward position, so that it does not move when unnecessary. Also, this lock shaft 17 has a pin 2 at its rear end.
3 engages one end of the swing arm 24. This swing arm 24 is attached to the back side of the magazine body 10 by a shaft 25a of a bracket 25.

On the other hand, the frame 9 is located on the back side of the magazine body 10, and the holder 26 is located at the tool exchange position.
is fixed. As seen in FIGS. 3 to 5, this holder 26 has a first rod 27 at a position corresponding to each lock shaft 17, and a second rod 28 at a position corresponding to the tip of the swing arm 24. is slidable in the axial direction and is held while being biased in the backward direction by respective springs 29 and 30. The first rod 27 and the second rod 28 have pins 31 and 31 at their rear end portions.
32 to L-shaped interlocking arms 33 and 34, respectively. These interlocking arms 33,
34 is a bracket 3 attached to the holder 26
5, 36 are rotatably supported by respective fulcrum pins 37, 38, and rollers 41, 42 are rotatably supported by roller shafts 39, 40 at the other end. These rollers 41 and 42 are connected to a triangular dog 4 attached to the side surface of the spindle head 3.
3. They correspond to the chevron-shaped dog 44, respectively.
These first rod 27, second rod 28, interlocking arms 33, 34, and the swing arm 24
constitutes a transmission mechanism for transmitting the motion of the spindle head 3 to the lock shaft 17.

Function of the invention Next, the function of the tool magazine device 1 will be explained together with the movement of the machine tool 2. First, when the tool 8 attached to the spindle head 3 is stored between the empty fixed claw 12 and the movable claw 13, the tool 8 of the spindle head 3 is placed between the empty fixed claw 12 and the movable claw 13. Thereafter, the base 5 moves in the X-axis direction, and the tool 8 is moved in the direction of the magazine body 10.

During this movement process, the dog 43 first hits the roller 41 as shown in FIG. 4, and the interlocking arm 33
Rotate counterclockwise. At this time, the first rod 27 moves forward against the spring 29 and moves the lock shaft 17 in the forward protruding direction, thereby opening the unlocking portion 21 to the rear end of the movable claw 13 as shown in FIG. position in the part. In this way, the movable claw 13 is brought into an unlocked state in which it can be opened within the recessed area of the unlocking portion 21.

Parallel to this unlocking operation, the tool 8 of the spindle head 3 enters the empty fixed pawl 12 and movable pawl 13 and is held thereby. In this state, when the spindle head 3 retreats in the Z-axis direction, the tool 8 moves back to the spindle head 3.
, and is supported by a pair of fixed claws 12 and movable claws 13 . In this way, the tool 8 of the spindle head 3 is transferred to the magazine body 10.

Furthermore, when the spindle head 3 retreats in the Z-axis direction, the dog 44 hits the roller 42 as shown in FIG. 5, causing the interlocking arm 34 to similarly rotate counterclockwise. At this time, the second rod 28 pushes the tip of the swing arm 24 as shown by the imaginary line in FIG. 3, causing the lock shaft 17 to retreat from the protruding position. At this time, since the lock portion 22 comes into contact with the rear end portion of the movable claw 13, the movable claw 13 cannot move in the opening direction, and the tool 8 is reliably held in a state where it does not come off. When the tool 8 is stored in the magazine body 10 in this manner, it automatically enters the locked state.

Thereafter, in order to mount a new tool 8, the spindle head 3 is positioned on the same axis as the new tool 8 by rotating the magazine body 10 or moving the spindle head 3 in the Y-axis direction, and then moved in the Z-axis direction. By moving forward along the same axis, the first rod 27 advances the lock shaft 17 by the dog 43, brings the new tool 8 into the unlocked state, and fits the main shaft 3a into it.
Next, by moving backward in the X-axis direction, a new tool 8 is extracted from the pair of fixed claws 12 and movable claws 13 in the unlocked state. In this way, a tool change is performed by the movement of the machine tool 2.

Note that when the magazine body 10 is indexed and rotated, the lock shaft 17, the swing arm 24, and the first rod 2
7. The second rod 28 is in a separate state.

Modification of the Idea In the above embodiment, corresponding to the triangular shape of the magazine body 10, the first rod 27 is attached to each of the four movable claws 13 arranged vertically at the tool changing position.
and four pairs of second rods 28 are provided. However, the magazine body 10 is a disc, and a pair of fixed claws 12 and a movable claw 1 are provided on the outer periphery of the magazine body 10.
3 and when tools are always changed at the same position, the first rod 2 is held only at that position.
7. It is sufficient that the second rod 28 is provided. Note that such locking and unlocking operations can also be performed manually, if necessary, by operating a knob 46 provided at the tip of the locking shaft 17.

Effect of invention The present invention provides the following effects.

Since all the tools are set in a state where they are not mechanically released between the fixed pawl and the movable pawl when the magazine body is indexed and rotated, it is possible to reliably prevent accidents of falling tools.

In addition, a pair of fixed claws and a movable claw are mechanically connected directly to the movement of the machine tool when changing tools, and can reliably switch between the locked and unlocked states, so a special drive source is not required. First, the structure and control can be simplified.

Furthermore, since the tool is unlocked only in conjunction with the exchange operation, malfunctions at positions other than the exchange position can be reliably prevented, resulting in safety.

[Brief explanation of the drawing]

Fig. 1 is a front view of a machine tool equipped with the tool magazine device of the present invention, Fig. 2 is a rear view of the magazine main body, Fig. 3 is a horizontal sectional view of a part of the magazine main body,
FIGS. 4 and 5 are horizontal sectional views of a portion during operation. 1... Tool magazine device, 2... Machine tool, 3
... Spindle head, 8 ... Tool, 9 ... Frame, 10
... Magazine body, 11 ... Shaft, 12 ... Fixed claw, 13 ... Movable claw, 15 ... Spring, 17
... Lock axis, 21 ... Unlock section, 22 ...
Lock part, 24... Swinging arm, 27... First rod, 28... Second rod, 29, 30... Spring, 33, 34... Interlocking arm, 43, 44
...Dog.

Claims (1)

[Scope of utility model registration request] A magazine body rotatably provided on the frame, a pair of fixed pawls and a movable pawl provided on the magazine body for gripping tools, and a movable pawl that can freely move forward and backward into the magazine body at a position where it can be engaged with the movable pawl. The movable claw is held in a locked state when the locking part is in a position corresponding to the movable claw, and the movable claw is held in an unlocked state when the unlocking part is in a position corresponding to the movable claw. The lock shaft includes a lock shaft and a transmission mechanism that transmits the motion of the spindle head of the machine tool to the lock shaft, and the transmission mechanism is connected to the lock shaft at one end and is swingably supported by the magazine body. a first rod that is movably provided in the frame at a position corresponding to the lock axis in the arm and tool exchange position;
A second rod is movably provided on the frame at a position corresponding to the other end of the swinging arm in the tool exchange position, and engages with the first and second rods at one end so as to be swingable on the frame. A tool magazine device comprising two interlocking arms provided, and two dogs attached to the spindle head of the machine tool and acting on the other end of each interlocking arm to impart rotational movement to the interlocking arms.