JPS5820742B2 - Tool magazine tool lock/unlock device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tool lock/unlock device for a tool magazine.

It is an object of the present invention to secure the locking of a tool, which is expandably inserted into a plurality of tool sockets pivotally held in a tool magazine, until the tool is gripped by an exchange arm, thereby removing the tool from the tool socket. This is to prevent the material from falling off.

Another object of the invention is to enable the tool to be locked and unlocked using the pivoting movement of the exchange arm.

Still another object of the present invention is to configure the tool sockets such that a lock shaft provided in each tool socket is operatively connected to one operating piece rotated by the exchange arm when the tool socket falls. The goal is to make it simple.

A tool changer installed in a vertical machine tool is generally provided with a tool magazine that pivotally holds a number of tool sockets into which tools are inserted in an expandable manner.

This tool magazine usually holds the tool socket horizontally,
When the tool socket with the required tool inserted is indexed to the exchange position, the tool socket is turned from a horizontal position to a vertical position parallel to the spindle, and the tool is exchanged between this tool socket and the spindle by the exchange arm. .

Therefore, a tool magazine used in such a vertical machine tool requires a locking device that prevents the tools from falling out of the tool socket, and an unlocking device that releases the locking device when the tool is replaced.

Therefore, the present invention provides a lock shaft for locking tools in a large number of tool sockets that are pivotally held in a tool magazine, and operatively connects the lock shaft to an operating piece by overturning the tool socket. The tool is rotated to lock and unlock the tool by utilizing the rotational movement of the exchange arm.

Embodiments of the present invention will be described below based on the drawings.

1 and 2, reference numeral 10 indicates a chain type one-tool magazine installed on the side of a column (not shown) of a machine tool, and a base 11 of this tool magazine 10 has a drive motor connected to a drive motor. A sprocket 12 and a recessed driven wheel are supported with a space therebetween, and an endless chain 13 meshing with the driving sprocket 12 is suspended between the driven wheel and the sprocket.

Socket supports 14 are integrally formed on the chain links constituting the chain 13 at equal intervals, and a tool socket 15 is pivotable on these socket supports 14 by a pair of pivot pins 16 as shown in FIG. is maintained.

The axis of each tool socket 15 is held horizontally by a guide rail 17 arranged along its movement locus, but the guide rail 17 is notched at the exchange position CP.
This allows the tool socket 15 indexed to the exchange position CP to be cartwheeled.

Although not shown in FIG. 1, a tool 20 is removably inserted into each of the tool sockets 15, and a pair of holding pins 23 are attached to the pull stud 21 of the tool 20, and are urged in the diameter direction by a spring 22. is engaged.

One end of the holding pin 23 is inserted into a block 25 fixed to the tool socket 15, and a lock shaft 26 is rotatable in the block 25 in a direction transverse to the holding pin 23, that is, parallel to the axis of the tool socket 15. It is fitted.

A rectangular engagement head 21 is formed at the tip of the lock shaft 26, and a notch 28 is formed in a portion of the outer peripheral surface of the lock shaft 26 in correspondence with the holding pin 23.

The lock shaft 26 is rotated between an angular position where the notch 28 faces the holding pin 23 (unlocked position) and an angular position where its outer peripheral surface faces the holding pin 23 (locked position). When the lock shaft 26 is in the unlocked position, the holding pin 23 is allowed to retreat, allowing the tool 20 to be removed from the tool socket 15.

However, normally the lock shaft 26 as shown in FIG.
is held in the locked position, thereby preventing the holding pin 23 from retreating and preventing the tool 20 from falling out of the tool socket 15.

Although not shown, in order to position the lock shaft 26 in two positions, the lock position and the unlock position, the block 25 has a retainer that releasably engages with each engagement groove formed in the lock shaft 26. A matching ball is loaded inside and is biased by a spring.

A socket tipping cylinder 30 is formed in the magazine base 11 in correspondence with the exchange position CP, and a piston 31 is fitted into the cylinder 30 so as to be slidable in the vertical direction.

An engaging member 32 is fixed to the rod end of the piston 31,
A U-shaped engagement groove 33 is formed in this engagement member 32 .

An engagement roller 34 bearing the block 25 of the tool socket 15 indexed to the exchange position CP is engaged in the engagement groove 33 so that the engagement roller 34 can pass through the engagement groove 33, thereby releasing the tool from the holding force exerted by the guide rail 17. The socket 15 is an engaging member 32
The same angular retention is still ensured by engagement with.

The tool socket 15 indexed to the exchange position CP is pivoted in a vertical plane using the pivot pin 16 as a fulcrum by the vertical movement of the retaining member 32 caused by the operation of the socket overturning cylinder 30. Its axis is rotated 90° from horizontal to vertical.

Further, the magazine base 11 is provided with a restraining cylinder 36 in which a piston rod 35 removably engaged with the engaging member 32 is fitted so as to be slidable in the horizontal direction.

The piston rod 35 is usually held at the forward end by the force of the spring 31 and engaged with the engagement member 32, thereby preventing the engagement member 32 from rising and moving the tool socket 15 indexed to the replacement position CP. Also, the tool socket 15 is prevented from falling down due to the weight of the tool 20.

However, the piston rod 35 is retracted against the spring 31 by the action of fluid pressure, thereby being separated from the engagement member 32 and allowing the tool socket 15 to fall.

Furthermore, a plate 41 having a receiving opening 40 is fixed to the magazine base 11 to receive the tool socket 15 which has been vertically turned over at the exchange position CP as described above.
An operating shaft 42 is supported on this plate 41 so as to be rotatable about a vertical axis.

A slit 43 is formed at the upper end of the operating shaft 42, which engages with the rectangular engagement head 27 of the lock shaft 26 when the tool socket 15 is vertically turned over.

The lower end of the operating shaft 42 has a cutout groove 44 as shown in FIG.
An actuating piece 45 having a shape formed therein is fixed.
The actuating piece 45 is rotatable within an angular range in which it engages with each other, and the actuating piece 45 is held by a regulating pin 41 biased by a spring 46 at each rotating end.

The operating piece 45 is rotated using the rotational movement of the exchange arm, which will be described later.

In FIGS. 1 and 5, 50 indicates a spindle head mounted on the front surface of the column so as to be movable up and down, and this spindle head 5
0, a main shaft 51 is rotatably supported around a vertical axis, and a tool 20 is removably inserted into the lower end of this main shaft 51.

Reference numeral 52 denotes an exchange arm for exchanging the tool 20 between the tool socket 15 vertically turned over at the exchange position CP and the main shaft 51, and this exchange arm 52 is fixed to the back surface of the magazine base 11. It is supported by a support body 53 so as to be reversibly rotatable and movable in the axial direction.

At both ends of the exchange arm 52, there are semicircular tool grips 55,
56 are formed, and the tool 20 is gripped by these tool gripping portions 55, 56 and presser bars 57, 58 fitted to both ends of the exchange arm 52 so as to be able to advance and retreat while being biased by a spring.

The exchange arm 52 also has a cutout groove 44 of the operating piece 45.
An operating pin 59°60 that rotates the operating piece 45 by engaging with the
is installed protrudingly.

Next, the operation of the apparatus of the present invention configured as described above will be explained.

While the workpiece is being processed by the tool 20 inserted into the spindle 51, the tool 20 to be used next is moved to the exchange position CP.
The drive sprocket 12 is driven by the recessed drive motor to rotate the chain 13.

As a result, each tool socket 15 into which the tool 20 is inserted is sequentially indexed to the exchange position CP, and its engagement roller 34 is sequentially engaged with the engagement member 32.

When the tool socket 15 into which the required tool 20 is inserted is indexed to the exchange position CP, the same mouth movement of the chain 13 is stopped, and in this state until the machining with the tool 20 inserted into the main shaft 51 is completed. stand by.

When the predetermined machining with the tool 20 inserted into the spindle 51 is completed, the spindle head 50 is moved to the upper end position for tool exchange, and at the same time, the tool socket 15 indexed to the exchange position CP is overturned. be exposed.

That is, when the processing is completed, the restraining cylinder 3 is first
6 is supplied with pressure fluid, and the piston rod 35 is moved back against the spring 31 and separated from the engagement member 32.

Subsequently, pressure fluid is supplied to the cylinder 30 for overturning the socket, and the engaging member 32 is raised together with the piston 31, whereby the tool socket 15 is placed in the horizontal state shown by the solid line in FIG. 2 with the pair of pivot pins 16 as fulcrums. From there, it is turned over 90 degrees to the vertical position shown by the two-dot chain line.

When the tool socket 15 is turned over by 90 degrees, the lock shaft 26
The square engaging head 27 of is engaged with the slit 43 of the operating shaft 42.

When the spindle head 50 is positioned at the rising end and the tool socket 15 at the exchange position CP is turned over to a vertical position, the exchange arm 52 is rotated by a predetermined angle clockwise in FIG.
The tools 20 and 20 inserted into the main spindle 52 and the tool socket 15 are gripped by tool grips 55 and 56 and presser bars 57 and 58 provided at both ends thereof.

At this time, as the exchange arm 52 is gripped and rotated, the operating pin 60 protruding therefrom engages with the notch groove 44 of the operating piece 45, thereby rotating the operating piece 45 counterclockwise in FIG. 4 by a predetermined angle.

The operation shaft 42 is integrally rotated by the rotation of the operating piece 45, and the lock shaft 26 is rotated by a predetermined angle via the engagement head 27 that engages with the slit 43.

As a result, the lock shaft 26 has its notch 28 aligned with the holding pin 2.
3 to the unlocked position facing the retaining pin 23
The tool 20 inserted into the tool socket 15 is unlocked so that the tool 20 can be moved back.

This action of unlocking the tool 20 is performed at the turning end of the exchange arm 52, and when the tool 20 is unlocked, the tool gripping portion 56 and the presser bar 58 are engaged with the tool 20. Therefore, there is no risk that the tool 20 will fall out of the tool socket 15.

On the other hand, the tightening of the tool 20 on the main shaft 51 is released.

Subsequently, the exchange arm 52 is advanced (lowered) by a predetermined amount in the axial direction, and the tools 20 and 20 held at both ends are released from the main shaft 51 and the tool socket 15, respectively, and after that, the exchange arm 52 is rotated 180 degrees and , is retracted (raised) by a predetermined amount in the axial direction.

As a result, the used tool 20 removed from the main spindle 51 is inserted into the tool socket 15, the next tool 20 removed from the tool socket 15 is inserted into the main spindle 51, and at the same time, the operating pin 59 is inserted into the operating piece 45. It is engaged with the notch groove 44.

The tool 20 inserted into the main shaft 51 is tightened integrally with the main shaft 51, and then the exchange arm 52 is rotated counterclockwise in FIG. 5 by a predetermined angle and returned to its original position.

Due to the return turning movement of the exchange arm 52, the actuating piece 45 is rotated by the actuating pin 60 by a predetermined angle clockwise in FIG. It is rotated by a predetermined angle clockwise in FIG.

Therefore, the notch 28 of the lock shaft 26 is retracted from the holding pin 23, and the holding pin 23 is again prevented from retreating by the outer peripheral surface of the lock shaft 26, and the tool 20 inserted into the tool socket H5 is locked. .

As described above, when the exchange arm 52 is returned to its original position, the spindle head 50 is lowered for machining the workpiece, and the tool socket 15 is changed from the vertical state to the horizontal state again by the action of the socket tipping cylinder 30. In this state, the magazine is driven to index the tool 20 to be used next to the exchange position CP.

As described above, the present invention provides that each tool socket pivotally held in a tool magazine includes a holding pin that can move forward and backward, and that engages with a pull stud of a tool that is removably inserted into the tool socket. A rotatable locking shaft for locking and unlocking the holding pin is provided, and an operating shaft is provided at the base of the tool magazine to engage with the locking shaft of the tool socket that is turned over from horizontal to vertical in the exchange position; Since the structure includes an operating piece that is fixed to the operating shaft and rotated by the rotation movement of the exchange arm, the tool inserted into the tool socket is not locked by the lock shaft except when it is gripped by the exchange arm. It has the effect of reliably preventing the tool from falling out of the tool socket underneath, and since it is only necessary to attach a lock shaft to each tool socket, the configuration of a large number of tool sockets can be simplified, and the tool can be locked easily. Since the unlocking is performed by the 11th rotation operation of the exchange arm, there are advantages such as no special driving source is required.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway front view of the tool magazine, FIG. 2 is an enlarged cross-sectional view taken along the line ■-■ in FIG. Figures 4 and 4 are cross-sectional views drawn along the lines ■-■ and ■-bar in Figure 2, respectively, and Figure 5 is a diagram showing the alternating seeding arm seen from the V direction in Figure 1. . 10... Tool magazine, 11... Magazine base, 14... Socket support, 15...
...Tool socket, 16...Pivot pin,
20... Tool, 21... Pull stud, 23... Holding pin, 26... Lock shaft, 27... Engaging head , 28... Notch, 30... Socket tipping cylinder, 42...
...Operation axis, 43...Slit, 45.
...Operating piece, 50... Spindle head, 51...
...Main shaft, 52...Replacement arm, 55.5
6...Tool gripping part, 59, 60...Operating pin, CP...Replacement position.

Claims (1)

[Scope of Claims] 1. A tool magazine horizontally holding a number of pivotable tool sockets into which tools are inserted in an expandable manner; In the tool changing device in which tools are exchanged using an exchange arm, each of the tool sockets is provided with a holding pin that engages with a pull stud of the tool so as to be movable back and forth, and each of the tool sockets is provided with a lock shaft that engages with the holding pin. is provided to be rotatable between a lock position and an unlock position, and the base of the tool magazine is rotatably provided with an operating shaft that engages one end of the lock shaft when the tool socket is vertically fallen. An operating piece is fixed to one end of the operating shaft, and the operating piece is reversibly rotated by the gripping and rotating operations of the exchange arm, and the locking shaft is locked via the operating shaft by forward and reverse rotation of the operating piece. A tool lock/unlock device for a tool magazine, characterized in that it rotates between a position and an unlock position. 2. A notch is provided in a part of the outer circumferential surface of the lock shaft, and when the lock shaft is in the locked position, the outer circumferential surface corresponds to the holding pin to prevent the holding pin from retreating, and when the lock shaft is in the unlocked position, the outer circumferential surface corresponds to the holding pin. The tool lock/unlock device for a tool magazine according to claim 1, wherein the notch is made to correspond to the holding pin to allow the holding pin to retreat. 3. The tool magazine according to claim 1, wherein a slit is formed at one end of the operating shaft, and a rectangular engagement head that engages with the slit in a separable manner is formed at one end of the lock shaft. Tool lock/unlock device.