JP2578412B2 - Automatic stylus changer for copying machine tools - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic stylus changing device for a copying machine tool, and relates to an improved copying machine that improves the speed of automatic stylus changing and simplifies the structure. The present invention relates to an automatic stylus changing device for a machine.

[Conventional technology]

Various types of automatic stylus changers for copying machine tools have already been proposed. For example, Japanese Patent Publication No. 60-59109 discloses two types of automatic stylus changers by the present applicant. That is, in the automatic stylus changing device of one of the two copying machine tools, a stylus storage device is provided in a fixed arrangement on the table of the machine tool, and the spindle head of the machine tool and the tracer head support are integrated. The tracer head is moved closer to and positioned on the stylus storage device by moving the tracer head relative to the table in three X, Y and Z directions, and a desired stylus is moved between the tracer shaft of the tracer head and the stylus storage device. The automatic exchange to is performed. This type of automatic stylus changer is used for X,
The tracer head can be moved closer to and away from the stylus storage device by using the feed mechanism in the Y and Z axes, but it is fixed and arranged on the table when the copying model is placed on the table. In addition, the stylus storage device that is used is an obstacle, and the moving stroke of the table requires a stroke length longer than a required distance dimension from the work so that the tracer head can reach the stylus storage device provided at the end of the table. There is. In addition, every time the stylus is automatically replaced, the X, Y, and Z
Since the mechanical operation in the axial direction is required, there is a disadvantage that the machining operation is interrupted, the stylus exchange is completed, and the time required to start the machining operation again becomes relatively long. However, the position of the tracer head is not always constant with respect to the stylus storage device, so that there is a disadvantage in that the command for performing the movement positioning of the stylus on the storage device must be changed each time.

In contrast to the above-described automatic stylus changing device of the copying machine tool of the former type, the other type of automatic stylus changing device has a stylus magazine fixed to an end of a tracer arm for supporting a tracer head, and a tracer head and a stylus magazine. A stylus changer arm similar to the change arm used in the automatic tool changer of a well-known machine tool is provided between the stylus changer arm and the stylus changer using the vertical movement and the turning operation of the changer arm. Is achieved. This configuration has a stylus magazine that is not on the table of the machine tool, but has both a stylus magazine and a changer arm at the tip of the tracer arm for supporting the tracer head. There is an impossible point.In addition, the stylus is pulled out of the changer arm from the tracer shaft of the tracer head or the socket of the stylus magazine, and the stylus mounting means is locked.
It has various disadvantages such as unlocking, turning for replacing the stylus, returning to a standby position that does not interfere with machining, and the need for a number of actuators associated therewith. Also has the disadvantage of being relatively complex.

[Problems to be solved]

Therefore, the above-described automatic stylus changing apparatus for a copying machine tool has various difficulties to be improved in terms of function and structure. Therefore, the present invention eliminates the structure for mounting the stylus magazine on the table. In addition to improving the access to the model by attaching the copying model and the operator, the time required for stylus replacement is shortened, and the space utilization and the structure are simplified in terms of mechanical structure. It is an object of the present invention to provide an automatic stylus changing device for a copying machine tool improved in both functions and structure.

[Solution]

In view of the above-described object, according to the present invention, there is provided an automatic stylus changing apparatus for a copying machine tool that automatically changes a stylus mounted on a tracer shaft of a tracer head of the copying machine tool in accordance with an exchange command. A tracer head lifting / lowering operation means for raising / lowering the tracer head on the support, and a plurality of styluses which are movably mounted on the tracer head support and accommodate a plurality of styli in a fixed posture, and index a desired stylus to a stylus replacement position. Stylus magazine enabled, stylus mounting means provided on each stylus to removably mount a stylus on the tracer shaft of the tracer head,
A magazine moving means for moving the stylus magazine between a retracted position away from the tracer head and a stylus transfer position closest to the tracer head in accordance with a stylus exchange command; and the stylus magazine has been moved to the stylus transfer position. At the stylus exchange position of the stylus magazine, the attachment / detachment actuation means for setting the stylus attachment means of the stylus to be exchanged into the clamped state or the unclamped state, and attached to the tracer shaft of the tracer head of the copying machine tool. In an automatic stylus changing device of a copying machine tool for automatically changing a stylus in response to a change command, the stylus magazine is rotatably mounted on the magazine base movably mounted on the tracer head support base and the magazine base. Supported, said A magazine plate in which a plurality is formed on the outer peripheral of the nest surface and notch for respective holding the number of styli,
Rotation driving means for indexing and rotating the magazine plate with respect to the stylus replacement position in accordance with a control command, wherein the stylus mounting means includes a tapered conical portion formed at a tip of a tracer shaft of the tracer head. A plurality of clamping spheres engaged with a V-groove formed on the outer periphery; a stylus attached to a lower end; and a fitting recess formed therein and complementary to a tapered conical portion at the tip of the tracer shaft; A socket member having a plurality of radial receiving holes for loosely receiving the clamping spheres, and a sphere contact surface facing the radial receiving holes inside the lower end while accommodating the socket members so as to be vertically movable, A sleeve member having a flange formed outside the lower end and an insertion opening at the top end formed with an insertion port at the tip of the tracer shaft; an upper end of the socket member and the sleeve portion; A compression spring mounted between the upper end of the sleeve member and pressing the sphere contact surface of the sleeve member toward the plurality of clamping spheres received by the socket member to apply a clamping force; The attachment / detachment actuating means is pivotally attached to the magazine base at a position opposed to the outer peripheral portion of the magazine plate, and is engaged with a flange of the sleeve member at a bifurcated portion to press the sleeve member against the compression spring. A multi-link lever operable to extend and push down, and pivotally held at a position in the magazine base away from the outer periphery of the magazine plate;
A cylinder device in which a telescopic piston end is coupled to the multi-link type lever, wherein the cylinder device responds to a stylus exchange command to extend and retract the stylus mounting means by the multi-link type lever and the stylus; An automatic stylus changing device for a copying machine tool, characterized in that the mounting means is clamped, and the magazine plate is configured to expand and contract between a retracted position where the magazine plate can be indexed and rotated without interference. According to this, when the stylus magazine is replaced with a stylus, the stylus magazine can be moved from the retracted position to the stylus transfer position close to the tracer axis of the tracer head to prepare for the stylus replacement. For stylus exchange only for stylus magazine There is no need to move dimensionally, moreover, without requiring changer arm is to perform a stylus replacement. Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

〔Example〕

FIG. 1 is a sectional view showing an essential part of a structure of an automatic stylus changing device of a copying machine tool according to an embodiment of the present invention, and FIG. 2 is a sectional view of a copying machine tool having the automatic stylus changing device. FIG. 3 is a front view, and FIG.
FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 1, FIG. 5 is a cross-sectional view showing the structure of the stylus mounting means, and FIG. It is a flowchart explaining the effect | action of a stylus exchange.

Referring first to FIG. 2, there is shown an overall configuration of a copying machine tool provided with an automatic stylus changing device according to the present invention. This copying machine tool is guided on a bed 10 fixed on the floor in the Y-axis direction perpendicular to the plane of FIG.
A saddle 14 that can move linearly with the guide 12 is provided. On this saddle 14, a table 16 that can move linearly in the X-axis direction (along the plane of FIG. 2) orthogonal to the Y-axis direction is provided. Is provided. A column 18 is fixedly provided upright on the back surface of the bed 10, and a spindle head 20 is formed on the column 18 in the Z-axis direction perpendicular to the upper surface of the table 16 on the column 18. It is provided so as to be able to move linearly along the guide surface. The spindle head 20 has a tool spindle 22 on which a tool T is mounted, and performs machining on a workpiece W on the table 16. Saddle 14, table 16, spindle head described above
Y-axis motor M _y, X-axis motor M _x, Z-axis motor M _z is provided a linear movement of the 20 as a drive source for driving, respectively.

A tool magazine 24 of a well-known automatic tool changer is mounted on the column 18 so as to be rotatable about its central axis, and a plurality of tools T are detachably attached to the tool magazine 24 via a tool socket. It is stored.
Hitting the automatic tool change, indexing the desired tool T tool change position shown in chain line T _a within the tool magazine 24 is mounted a tool T indexed in the tool change position T _a to the tool spindle 22 The tool T and the tool change arm 26 are used to automatically change one another. Reference numeral 28 denotes a handle for manually displacing the tool spindle 22 up and down.

On the other hand, in the copying machine tool, an arm-shaped tracer head support 30 extending in the lateral direction from the column 18 is provided, and the tracer head 32 can be moved up and down on the tracer head support 30. The stylus is held at the lower end of the tracer head 32 so as to be detachable. Elevating operation of the tracer head 32 is driven by the lifting motor M _T, tracer head itself, as described later, is held in the lower end of the tracer head moving table 36, actuating the tracer head moving table 36 of the elevating motor M _T Accordingly, the tracer head 32 moves up and down with respect to the tracer head support 30. At this time, the tracer head 32 moves up and down together. Further, a stylus magazine support stand is provided on the tracer head support base 30 at a position not shown in FIG. 2 by a separate mounting structure or an integral structure, and the stylus magazine support base has a plurality of stylus magazines 40 described later. Is provided for storing the replacement stylus and for exchanging the stylus with the tracer head 32.

In addition to the mechanical configuration described above, the copying machine tool includes a copying control unit 100 and a stylus exchange control unit 1 as electrical control means.
02 etc., and the former copying control unit 100
When the stylus 34 of the tracer head 32 is displaced by the stylus 34 of the tracer head 32, the displacement signal is received from the tracer head 32, and the motors M _X , _X ,
It is provided as a control function unit that controls the operations of M _Y and M _Z and copies the workpiece W to the same or similar dimensions as the copying model M. On the other hand, when receiving the exchange of the stylus 34 is needed between the stylus exchange control unit 102 trace machining process as a command signal from the above-mentioned scanning control unit 100, the lifting motor M _T and stylus magazine tracer head 32
A control signal accompanying stylus replacement is sent to the stylus 40 and the stylus 34 is automatically replaced with respect to the tracer shaft of the tracer head 32.

Referring now to FIG. 3, there is shown a tracer head held on the tracer head support 30 shown in FIG.
A detailed configuration example of 32 elevating operation mechanisms is shown. The tracer head support 30 has a bracket 4 on the front of the jaw 30a.
The above-mentioned tracer head moving base 36 is attached to the bracket 42 so as to be able to move up and down along the guide surface 44 in the upward and downward directions. Tracer head carriage 36
Has a tracer head 32 fixed at its lowermost end by a suitable fixing means, and a tracer shaft 33 for attaching a stylus 34 (FIG. 2) to the tip of the tracer head 32.
Is provided. The tracer head moving base 36 is formed as a hollow structure as shown in the figure, and a nut 48 is fixed to a seat 46 provided above the inside thereof. And
A feed screw 50 having a predetermined length in the axial direction of the tracer head moving base 36 is screwed into the nut 48.
The upper end of 50 is rotatably and axially immovably supported by a rotary bearing 54 mounted on a pedestal 52 provided on the upper end of the bracket 42, and is connected to a pulley 56a. 52a is a cover. Also, the pulley 56a
Constituting the belt pulley mechanism for transmitting to the screw 50 sends the rotational output of the combined by elevating motor M _T to another pulley 56b mounted on the output shaft end of the elevating motor M _T of the tracer head 32 through the belt 58 doing. The feed screw 50 and the nut 48 are connected to the tracer head moving base 36 and the tracer head 32.
Of the lifting screw mechanism. As the lifting motor M _T, using the servo motor, is formed so as to be controlled appropriately in accordance with desired operation of the feed screw mechanism according to the control signal. FIG. 3 shows a part of a magazine support base 60 for supporting the stylus magazine 40.

Referring now to FIGS. 1 and 4, FIG. 1 shows a partial structure of a main part of an embodiment of an automatic stylus changing apparatus according to the present invention, including a cross-sectional view.
A magazine support 60 provided integrally with the tracer head support 30 holding the 32 or by a separate mounting structure is provided. A bracket 62 is formed below the magazine support base 60, and a lateral guide surface 64 is formed. The guide surface 64 is formed as a guide for moving the slide base 66, which is a component of the stylus magazine 40, toward the tracer head 32, and retracting the slide base 66 in the opposite direction. The outer end of a piston rod 70 of a fluid cylinder 68 provided as an actuator for driving the approach movement and the retreat movement of the slide base 66 is connected, and the outer end of a cylinder body 68a of the fluid cylinder 68 slides. It is pivotally connected to a bracket 66a projecting downward from the base 66 by pin connection. That is, when the cylinder body 68a reciprocates with respect to the piston rod 70 of the fluid cylinder 68 in accordance with the supply of the pressurized fluid, the slide base 66 approaches the tracer head 32 to the position closest to the tracer head 32 along the guide surface 64, or For example, it is separated from the head 32. First
The figure shows that the slide base 66 is at the retracted position.

The slide base 66 has a column 72 extending downward, and a magazine base 74 is provided at a lower end of the column 72. The slide base 66, the column 72, and the magazine base 74 may be formed as an integral structural element. An annular boss 76 is formed on the magazine base 74, and a magazine plate 80 is mounted on the outer periphery of the boss 76 via a bearing 78 so as to be pivotable about the bearing 78. In the magazine plate 80, a plurality of storage holes 82 for storing and holding a plurality of styluses 34 are formed at substantially equal intervals in a circumferential direction. In the magazine plate 80, an internal gear 84 is engraved on the inner periphery of the central large-diameter hole, and a pinion 86 meshes with the internal gear 84. The pinion 86 is directly connected to an indexing motor 88 mounted on a magazine base 74, and the magazine plate 80 is engaged with the pinion 86 and the internal gear 84 in accordance with the rotation of the indexing motor 88. It is possible to pivot over a desired rotation angle. Then, a desired one of the plurality of styluses 34 held in the plurality of storage holes 82 by the rotation of the magazine plate 80 is placed at a predetermined angular position, that is, a stylus replacement position that is aligned with the tracer axis of the tracer head 32 in the magazine radial direction. It can be indexed to ST _a . And this stylus magazine 40 magazine board
The stylus 34 indexed to the stylus exchange position ST _a at 80 directly below the position of the tracer axis 33 of the head 32 to the tracer,
That is, if the stylus 34 is moved from the stylus magazine 40 to the stylus transfer position where the stylus can be transferred to the tracer shaft 33 by the linear sliding of the slide base 66, the stylus can be replaced. Of course, a magazine plate
Indexing the empty stylus housing hole 82 in the 80 to stylus replacement position ST _a, which if brought into reach stylus transfer position described above is brought closer to the tracer shaft 33, head to tracer
Needless to say, for example, a used stylus 34 attached to the tracer shaft 33 of the 32 can be transferred back to the empty stylus storage hole 82.

Now, as described above, in order to transfer the stylus 34 between the stylus magazine 40 and the tracer shaft 33 to achieve the stylus automatic exchange, means for attaching the stylus 34 to the shaft end of the tracer shaft 33, This mounting means is required to be operated in two states, a clamp state and an unclamped state, and both means for attaching and detaching to and from the shaft end of the tracer shaft 33 are required. FIG. 1 shows a cylinder-operated attachment / detachment device 90 provided on the stylus magazine 40 as an embodiment of the latter attachment / detachment means. The attachment / detachment device 90 includes a fluid cylinder 92 having one end pivotally connected to the slide base 66, a joint member 95 attached to a tip of a piston 94 of the fluid cylinder 92, and a joint member 95.
Are formed as a multi-link structure type lever device such as a lever member 98 which is connected to the bracket 97 fixed on the magazine base 74 by a pin connection, while being connected via two link members 96a, 96b. The attachment apparatus 90 is in contact with the lever member 98 described above in the flange portion 34a to be described later which is provided in the stylus 34 indexed to the stylus exchange position ST _a stylus magazine 40 is brought, a downward pressing force to the flange portion 34a When applied, the mounting means described below is shifted to the unclamped state, and when separated from the contact position with the flange portion 34a, the mounting means is shifted to the clamped state, and the link member is operated in accordance with the operation of the fluid cylinder 92. 96a and 96b expand or contract, and as a result, the lever member 98 is configured to contact or separate from the flange portion 34a of the stylus 34.

FIG. 4 is a diagram showing the plan configuration of the stylus magazine 40 including the above-mentioned attaching / detaching device 90 viewed downward from the line IV-IV in FIG. 1, and shows a plurality of styluses 34 around the magazine plate 80.
It is clearly the arrangement of the structure as well as stylus exchange position ST _a possible storage housed. It is also specified that each of the stylus storage holes 82 is a notch-shaped hole (egg hole) which is opened outward in the radial direction of the circular magazine plate 80.

FIG. 5 shows an embodiment of a mounting means for detachably mounting the stylus 34 to the lower end of the tracer shaft 33 of the tracer head 32. In this embodiment, the stylus 34 is mainly attached to the tracer shaft 33 itself. Is provided as a mounting device 110 formed to exhibit two states of a clamp state and an unclamped state with respect to a lower end of the mounting apparatus 110.

The mounting device 110 causes a plurality of clamp spheres 112 to be engaged with a V-shaped groove 135 formed in a tapered conical portion 133 at the lower end of the tracer shaft 33 by a spring urging force. The stylus 34 is mounted on the tracer shaft 33 by utilizing the engagement of the stylus 34. That is, the mounting device 110 has a hollow cylindrical socket 116 for fixing and holding the stylus 34 with fixing means such as a set screw 114 or the like, and the upper portion of the socket 116 has a tracer shaft 33.
Is formed to receive the lower end of the tracer shaft 33, and the inner peripheral wall of the opening is formed in a complementary shape so as to be able to tightly engage with the tapered conical portion 133 formed at the lower end of the tracer shaft 33. A tapered portion 118 is provided, and a plurality of holes 120 are provided directly above the tapered portion 118 for receiving the clamp sphere 112 in a loosely fitted state. The socket 116 is inserted into a sleeve 122 also having a hollow cylindrical shape. Conversely, the sleeve 122 is formed so as to be slidable up and down along the outer periphery of the socket 116. The sleeve 122 has the flange portion 34a for the stylus 34 at the lowermost outer periphery, and has a spherical contact surface 124 facing the hole 120 of the socket 116 at the lower inner periphery. The top of the sleeve 122 is formed as an insertion opening for the tracer shaft 33, and an inwardly projecting annular lip 126 is formed as a spring seat. A compression spring is arranged to surround the tracer shaft 33 inserted from above between the lip 126 and the top end of the socket 116.
128 are stored. The compression spring 128
It is provided to always apply a spring biasing force to press the socket 116 downward from above with respect to 2, and in a state where the socket 116 is pressed downward with respect to the sleeve 122 as described above, The sphere contact surface 124 of the sleeve 122 presses the clamp sphere 112 inward, so that the clamp sphere 112 is inserted into the tapered conical portion 1 of the inserted tracer shaft 33.
It is engaged with the V-shaped groove 135 formed in 33 and becomes a clamped state.

On the other hand, when the mounting device 110 is in the clamped state, if the sleeve 122 is forcibly moved down with respect to the socket 116 against the spring biasing force of the compression spring 128, the sphere contact surface 124 of the sleeve 122 is Dissociates from the clamp sphere 112. As a result, the inward pressing force acting on the clamp sphere 112 is released, and the clamp sphere 112 can move freely in the hole 120 of the socket 116. Thus, the clamp sphere 112 is released from the V-shaped groove 135 of the tracer shaft 33, so that the mounting device 110 is in an unclamped state. In this case, the sleeve described above
The means for moving the 122 downward with respect to the socket 116 is the attaching / detaching device 90 provided on the stylus magazine 40 described above, and the stylus 34 is inserted into the storage accommodating hole 82 in the magazine plate 80 of the stylus magazine 40 for the fifth time. As shown in the figure, when the fixing is performed at the step 116a of the socket 116, the flange 3
When the lever 4a is pressed by the lever member 98 (having a bifurcated shape as shown in FIG. 4) of the attaching / detaching device 90, the above-described clamped state can be shifted to the unclamped state. When the lever member 98 of the attachment / detachment device 90 is pulled back from the position shown by the dashed line in FIG. 1 to the position shown by the solid line, the clamped state of the attachment device is restored.

In the above description, the mechanical structure and operation of the raising / lowering operation mechanism of the tracer head, the stylus magazine, the stylus magazine moving device, the stylus mounting device, and the attaching / detaching device constituting the automatic stylus changing device of the copying machine tool according to the present invention. The operation of the automatic stylus changing device will be described below with reference to the operation flowchart shown in FIG.

Now, the stylus automatic exchange is performed by transferring the stylus 34 attached to the tracer shaft of the tracer head 32 to another stylus 34 while the copying control unit 100 shown in FIG. 2 is performing the copying according to a predetermined program. When the need for replacement occurs, it is generally started by sending a signal instructing the stylus replacement control unit 102 to replace the stylus. Of course, it is also possible for the worker to start by sending a signal instructing the stylus exchange to the stylus exchange control unit 102 voluntarily. In addition, it is also possible to provide an appropriate detecting means for detecting that an abnormality has occurred in the stylus 34 in use, and to perform a stylus automatic exchange in response to an abnormality occurrence detection signal from the detecting means. .

Upon receiving the stylus automatic exchange command, the stylus exchange control unit 102 generates a stylus automatic exchange control signal in a predetermined order. At that time, first, the copying operation of the copying machine tool is interrupted, but the saddle 14, the table 16, and the spindle head 20 may simply be stopped at the position at that time, or if necessary. Accordingly, automatic tool change and other operations may be performed in parallel.

First, the stylus automatic replacement is started by a step of raising the tracer head 32 from the copying operation position in contact with the model M to a predetermined stylus replacement standby position. The stylus replacement standby position is such that the surface of the jaw 116a of the stylus 34 mounted on the tracer head 32 raised as shown in FIG.
At a position slightly higher than the stylus receiving surface of the magazine plate 80 (the upper surface of the stylus storage / storage hole 82) by a few millimeters, thereby interfering with the empty storage hole 82 of the stylus magazine 40 from the tracer shaft 33. Without returning the stylus 34.

Then, the tracer head 32 the stylus magazine 40 with indexing the empty stylus housing hole 82 in the stylus magazine 40 to the stylus exchange position ST _a from the retracted position
, The stylus is advanced to the stylus transfer position immediately below. This is achieved by the operation of the fluid cylinder 68 described above. When the stylus magazine 40 moves to the stylus transfer position immediately adjacent to the tracer head 32, the tracer head 32 at the stylus replacement standby position is lowered by the same amount as the above-described appropriate amount of rise. Due to this lowering operation, the stylus 34 attached to the lower end of the tracer shaft 33 becomes an empty storage hole 82 of the stylus magazine 40.
To sit down. That is, the jaw 116a of the socket 116 of the stylus 34 comes into contact with the upper surface of the stylus storage hole 82 of the magazine plate 80. Next, the attachment / detachment device 90 is operated, and the attachment device 110 of the stylus 34 is shifted to the unclamped state. As a result, first, the stylus 34 attached to the lower end of the tracer shaft 33 becomes an empty storage hole of the stylus magazine 40.
Transferred to 82, returnable. Next, this mounting device 11
When the tracer head 32 is raised in the unclamped state of 0, the stylus 34 is separated from the tracer shaft 33 and the return to the stylus magazine 40 is completed. At this time,
The attachment / detachment device 90 includes the stylus 34 returned from the tracer shaft 33.
(Returns to the position indicated by the solid line in FIG. 1).

Next, the indexing operation of the stylus magazine 40 is performed while the tracer head 32 is maintained at the above-described raised position. That next step of action to index the desired stylus 34 to be mounted to the tracer head 32 to a stylus replacement position ST _a is performed. As described above, the indexing action is driven by the indexing motor 88.

When the above-described indexing of the desired stylus 34 is completed,
The attachment / detachment device 90 is operated again, and the attachment device 110 of the desired stylus 34 is set in the unclamped state. Next, when the tracer head 32 at the raised position is lowered, the tracer shaft
The tip of 33 is a stylus waiting in the unclamped state
It is inserted inside 34 mounting devices 110. Therefore, when the attachment / detachment device 90 is pulled up at this time, the mounting device 110 returns to the clamped state, and as a result, the stylus 34
It is firmly attached to the lower end of 33.

Next, when the tracer head 32 is again raised to the stylus replacement standby position, the ascent operation is performed with the desired stylus 34 attached to the lower end of the tracer shaft 33, so that the stylus 34 is stylus storage hole 82 of the stylus magazine 40.
Leave upward from. When the stylus magazine 40 reaches this state, when the stylus magazine 40 is moved backward from the stylus transfer position to the retreat position, the above-described desired stylus 34 is completely separated from the storage hole 82 of the stylus magazine 40, and the stylus 34 is automatically replaced. One cycle of operation is complete. At this time, the stylus exchange control unit 102 sends a stylus automatic exchange completion signal and the tracer head 32.
Is brought close to the copying model M, and preparation for restarting the copying process is prepared.

The embodiment of the automatic stylus changing apparatus of the copying machine tool according to the present invention has been described above. According to the present invention, the following effects can be obtained based on the above-described configuration and operation.

〔The invention's effect〕

1.Because it is not mounted on the table of the stylus magazine machine tool but is held on the magazine support mounted on the tracer head support, there is no obstacle to the setup work process of mounting the copying model on the table. Further, since the worker has good accessibility to the copying model and the work, the work is easy.

2.A means for raising and lowering the tracer head and a means for moving the stylus magazine in the horizontal direction are provided.In the stylus automatic change process, mutual approach operation can be performed only with the stylus magazine and the tracer head. Since it is not necessary to operate the feed shaft of the shaft and use it for stylus replacement, the cycle time required for automatic stylus replacement can be reduced as compared with the related art. Further, the machine tool can perform other operations such as automatic tool change in parallel if desired.

3. Since there is no stylus changing arm and the structure in which the tracer head is directly positioned at the stylus changing position of the stylus magazine to perform stylus changing, the number of actuators for stylus changing is small, and the structure is simplified. In particular, when replacing the stylus with the tracer shaft of the tracer head by activating the mounting device, the compact multi-link lever is operated by a single cylinder device to clamp and unclamp the mounting device. In addition to this, the magazine plate holding multiple styli can be indexed and rotated near the tracer head so that the required stylus can be mounted on the tracer head. It also contributes to space saving.

[Brief description of the drawings]

FIG. 1 is a side view showing an essential part configuration of an embodiment of an automatic stylus changing apparatus for a copying machine tool according to the present invention, including a partial sectional view, and FIG. 2 is provided with the automatic stylus changing apparatus. Mechanism diagram showing overall configuration of copying machine tool, third
The figure is a side view including a partial cross-section showing the elevating operation mechanism of the tracer head viewed from the direction of arrows III-III in FIG.
4 is a sectional view taken along the line IV-IV of FIG. 1, FIG. 5 is an enlarged sectional view showing one embodiment of a detailed structure of the stylus mounting device, and FIG. 6 is an automatic stylus changing device according to the present invention. 6 is a flowchart for explaining the operation of FIG. 16 ... table, 20 ... spindle head, 22 ... tool spindle, 30 ... tracer head support, 32 ... tracer head, 33 ... tracer shaft, 34 ... stylus, 40 ... stylus magazine, 60 ... magazine support, 64 ... guide surface , 66… Stide base, 68…
Fluid cylinder, 90 ... detachment device, 100 ... copying control unit, 102 ...
Stylus replacement control unit, 110 ... mounting device, T ... tools, ST _a
... Stylus replacement position, M ... Copy model.

Claims (1)

(57) [Claims] 1. A tracer head lifting / lowering operating means for raising / lowering a tracer head 32 on a tracer head support 30;
A stylus magazine 40 that is movably mounted on the tracer head support and houses a plurality of styluses 34 in a fixed posture, and enables a desired stylus to be indexed to a stylus replacement position, and a tracer shaft of the tracer head. A stylus mounting means 110 provided on each stylus for detachably mounting the stylus, and a stylus replacement command between a retracted position where the stylus magazine is separated from the tracer head and a stylus transfer position immediately adjacent to the tracer head. A magazine moving means for moving the stylus magazine according to the stylus magazine, and a detachable stylus mounting means for the stylus to be exchanged at the stylus exchange position of the stylus magazine when the stylus magazine is moved to the stylus transfer position. With operating means 90 Configured Te, an automatic stylus replacement device of a copying machine to automatically exchange in accordance with the change command of the stylus to be attached to the tracer axis of the tracer head tracing machine tool, the stylus magazine, the tracer head supporting base
A magazine base 74 movably mounted on the magazine 30; a magazine plate 80 rotatably supported by the magazine base and having a plurality of receiving surfaces and notches formed on the outer periphery thereof for holding the plurality of styli 34; Rotating drive means 88 for indexing and rotating the magazine plate with respect to the stylus replacement position in accordance with a control command, wherein the stylus mounting means has a taper formed at the tip of a tracer shaft 33 of the tracer head 32. A plurality of clamping spheres 112 engaged with a V-shaped groove 135 formed on the outer periphery of the conical portion 133, and a stylus 34 attached to the lower end thereof. The inside thereof is complementary to the tapered conical portion at the tip of the tracer shaft 33. And a socket member 116 having a plurality of radial receiving holes 120 for loosely receiving the plurality of clamping spheres, and the socket member can be relatively moved up and down. And a sleeve member 122 having a spherical contact surface 124 facing the radial receiving hole inside the lower end, a flange 34a formed outside the lower end, and an insertion opening at the top end of the tracer shaft formed therein, and the socket Compression mounted between the upper end of the member and the upper end of the sleeve member to press the sphere contact surface of the sleeve member against the plurality of clamping spheres received by the socket member to apply a clamping force. A spring 128, wherein the detachable operating means is pivotally attached to the magazine base 74 at a position opposite to the outer peripheral portion of the magazine plate, and engages with the flange 34a of the sleeve member 122 at a forked portion. A multi-link lever 98 that can be extended to push down the sleeve member against the compression spring 138, and separate from the outer peripheral portion of the magazine plate in the magazine base. While being pivotally retained in position, and a cylinder device 92 which combines the expansion piston end to the multi-link type lever,
In response to the stylus exchange command, the cylinder device causes the multi-link lever to unclamp the stylus mounting means, clamps the stylus mounting means, and allows the magazine plate 80 to be indexed and rotated without interference. An automatic stylus changing device for a copying machine tool, wherein the stylus changing device is configured to extend and contract between a retracted position and a retracted position.