KR970008474B1 - Automatic tool changer of machine tool - Google Patents

Abstract

None.

Description

Automatic tool changer of factory machine

1 is a longitudinal sectional view showing a schematic configuration of a main component part according to the best embodiment of the automatic tool changer according to the present invention.

2 is a longitudinal sectional view showing a main part of a tool magazine.

3 is a view from arrow A of the tool magazine shown in FIG.

4 is a view from arrow B of the tool magazine shown in FIG.

5 is an exploded perspective view schematically showing the main part of the automatic tool changer according to the present embodiment.

6 is a view seen from arrow C of FIG. 1 showing an embodiment of a tool magazine index mechanism used in this embodiment.

FIG. 7 is a view from arrow D of FIG. 1 showing the spindle head as seen from the tool magazine side.

FIG. 8 is a view seen from arrow E of the spindle head shown in FIG. 7. FIG.

9 (a)-(j) are schematic diagrams showing the motions of the tool magazine disposed at the fixed position, the spindle head lifting in the Z-direction, and the grip arms provided to rotate index the tool magazine. Explanatory diagram.

FIG. 10 is a time chart diagram showing the operation of each member corresponding to the movement of the spindle head shown in FIGS. 9 (b)-(j) over time. FIG.

* Explanation of symbols for main parts of the drawings

12 Frame 18 Nut

20: Ball screw 22: Servo motor

24: spindle head 40: spindle

42: tool support 48: tool holder

64: magazine base 66: tool magazine

82: holder holding means (grip arm) 82: 2 branch portion

84: pivoting shaft 86: movable cam body

86a: movable cam surface 87: fixed cam body

87a: fixed cam surface 94: first cam follower

96: second cam follower 97: rail plate

98: support pin

The present invention relates to an automatic tool changer for a machine tool, and more particularly, a plurality of grip arms which are arranged to reciprocate a spindle head with respect to a frame, and which can hold a tool holder. An automatic tool changer for a machine tool which rotates a tool magazine and automatically transmits and receives a tool holder between the spindle head and the tool magazine by reciprocating the spindle head.

Multifunctional machine tools represented by machining centers (MCs), which are designed to perform a variety of machining operations such as thread cutting, hole drilling, spot facing processing, etc. on a workpiece in a single device, require tools such as taps and drills to be previously stored in a predetermined storage location. In general, an automatic tool changer (ATC) for storing a large number of tools in a timely manner, selecting a desired tool in a timely manner, and automatically replacing the tool with the used tool is usually disposed. Various types of automatic tool changers have been proposed, but the cam mechanism is moved between the tool magazine which is fixed to the frame by moving the spindle head in the vertical direction (hereinafter referred to as "Z-axis direction"). A mechanism for performing tool change by using the tool has been put into practical use.

For example, a machine tool proposed by Showa 62 (1987) Patent Application No. 102345 of the Applicant's earlier application can be clamped and released with a tool holder with a V-shaped groove on the outer periphery. A spindle head rotatably supported by the reciprocating drive mechanism, the spindle head being reciprocated in the axial direction of the spindle axis with respect to the frame by means of a reciprocating drive mechanism, and fixed to the frame; The tool holder is provided with a tool magazine which is rotatably indexable so that the grip arm formed at the free end has a two-part gripper that can be gripped in the substantially V-shaped groove, and the tool can be changed automatically. In a machine tool, a first cam follower is disposed at a semi-free end near the pivoting portion on the grip arm, and is based on the reciprocating movement of the spindle head. A first cam body having a cam surface in contact with the cam follower and guiding the two branch portions along the approximately V-shaped groove portion of the tool holder is disposed on a side opposite to the tool magazine of the spindle head.

Further, the machine tool has a second cam follower disposed at the semi-free end of the grip arm, and contacts the cam follower based on the reciprocating movement of the spindle head so that the second branch of the grip arm faces the spindle head. The 2nd cam body which formed the cam surface to oscillate is fixedly arrange | positioned at the side surface which opposes the tool magazine of the said spindle head.

However, in the case of moving the spindle head in the Z-axis direction to move the grip arm supported so as to swing in the tool magazine disposed at a fixed position with respect to the frame by the first cam body disposed on the side of the spindle head, Since the grip arm is moved by the first cam follower disposed near the pivoting portion of the grip arm, the tool support portion of the second branch at the free end of the grip arm and the V-shaped groove portion cast in the tool holder are placed. An error in the gripping position occurs due to an error in the contact between the first cam body and the cam follower, or a multiple of the machining error of the grip arm, the cam body, and the pivoted portion.

Furthermore, when the second cam body for swinging the second branch of the grip arm toward the spindle head is provided with two cam bodies for moving the grip arms, the machining precision of both cam bodies and the machining precision of the pivoting portions of the grip arms In this case, excessive force is applied to the pivoting part of the grip arm during abnormal operation, which leads to an increase in manufacturing cost or failure of the automatic tool changer.

In order to cope with the current small quantity production of a large variety of products, it is very important to enable stable tool change in the market which requires frequent tool change and shortening of machining time by several seconds. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is an annular groove formed in the tool support portion and the tool holder of the two-branch portion at the free end of the grip arm when the tool is pulled out from the main shaft and sent to the tool magazine. It is an object of the present invention to provide an automatic tool changer that can easily achieve a precision at a grip position of a. Further, another object of the present invention is to provide an automatic tool changer that can perform tool change stably without excessive force being applied to the pivoting portion of the grip arm.

In order to achieve the above object, the automatic tool changer of the present invention has a first cam follower disposed near the two branch portions of the grip arm, and at the same time based on the movement of the spindle head. A peripheral surface of the tool holder mounting portion on the main side from a side facing the tool magazine of the spindle head, the fixed cam body having a cam surface for applying a swinging motion to the grip arm and drawing out a tool holder mounted on the main shaft. It is characterized in that the fixed installation over).

In addition, the automatic tool changer which achieves another object of the present invention is provided with a movable cam body which is elastically floating on a side opposite to the tool magazine of the spindle head and is narrower than the second branch. A second cam follower capable of contacting the cam surface of the movable cam body is provided on the grip arm on the opposite side with the first cam follower and the swinging center interposed therebetween.

Next, an embodiment of the automatic tool changer according to the present invention will be described with reference to FIGS.

(About spindle head and tool magazine)

The machine tool equipped with the automatic tool changer shown in FIG. 1 is arranged in a frame 12 fixed to a vertical column 10, and includes a main head 24 for reciprocating in the Z-axis direction, and the frame ( The tool magazine 66 which is arrange | positioned through the magazine support 58 at 12) and which can be indexed rotationally is provided basically. That is, the guide rail 14 is vertically disposed on the frame 12, and the main shaft head 24 opens the guide rail 14 through a pair of sliding saws 16 and 16 disposed in a vertical relationship. Therefore, it is mounted so that it can go up and down in the Z-axis direction. The nut 18 is fixed to the spindle head 24 at an appropriate position, and a rotatable ball screw 20 supported in parallel along the guide rail 14 is inserted into the nut 18. Then, the ball screw 20 is rotationally driven in the forward direction by the servomotor 22 disposed behind the frame 12, so that the spindle head 24 has a nut 18 and a ball screw 20. Movement along the guide rail 14 to move up and down in the Z-axis direction is given under the action of screwing.

Inside the spindle head 24 is vertically disposed so that the spindle 40 with the tool support 42 at the lower end can rotate, the spindle 40 for the drive of the tool installed above the frame 12 It is connected to the motor 36 via the cup ring 38, and is rotated by this motor 36. As shown in FIG. The tool support part 42 of the main shaft 40 is able to fit the arbor 52 in the tool holder 48 with the tool 50 mounted at the tip, and the tool holder 48 is connected to the tool support part ( 42, the pull stud 54 provided in this holder 48 is clamped (clamped) by the holder holding member 44 provided in the main shaft 40. As shown in FIG. In addition, the holder clamping member 44 is pressed by the draw bar 46 which is coaxially inserted into the center through hole of the main shaft 40, so that the pull stud 54 of the holder clamping member 44 is pressed. The pinch is released (unclamped) so that the tool holder 48 can be removed.

(Agreement and Release of Organization of Tool Holders)

In order to clamp the tool holder 48 fitted to the tool support portion 42, and to release the clamp, a crank lever and a cam mechanism for imparting a rocking motion thereto are provided. In other words, the L-shaped crank lever 30 is supported so as to be able to swing through the support shaft 32 at an appropriate position of the main shaft head 24. The distal end portion can engage with the pin 56 protruding orthogonal to the draw bar 46. In addition, an urban plate cam 28 having an inclined surface inclined downward from the top thereof is fixed to the other long lever 30b of the crank lever 30 so that the plate cam 28 is located on the movement trajectory. The cam follower 26 disposed on the servomotor 22 can be disengaged from the cam follower 26. In addition, the tension coil spring 34 is elastically mounted between the long lever 30b and the spindle head 24, and the crank lever 30 is normally applied in a clockwise direction, and thus the short lever 30a is used. The pin 56 is released.

Then, when the spindle head 24 is raised by the driving of the servomotor 22, the cam follower 26 in which the plate cam 28 installed on the crank lever 30 is disposed at a fixed position in the raising process. ), And gives the crank lever 30 a counterclockwise movement about the support shaft 32. Due to this, the short lever 30a pushes the pin 56 downward and exerts a force on the holder clamping member 44 through the drawbar 46 to clamp the pull stud 54 of the tool holder 48. Release it.

(About the rotating index mechanism of the tool magazine)

In the magazine support 58 fixed to the frame 12, as shown in FIG. 1, a support shaft 60 is inclined to the lower left side and is disposed adjacent to the tool change region of the spindle head 24. A cylindrical magazine base 64 with a collider is supported by 60 so that it can rotate through the bearing 62. As shown in FIG. The magazine base 64 is arranged so that a plurality of grip arms 82 which function as holder holding means described later can be radially swinged in plural (ten in the illustrated example) at the required center angle. In the magazine base 64, a roller-shaped cam follower 78 is provided on one side of the index disc 80 centering on the support shaft 60 so as to correspond to the position where the grip arm 82 is disposed. In the example, 10) are installed.

As shown in FIG. 6 which is the figure seen from the arrow C of FIG. 1 and FIG. 1, the indexing motor 68 is inverted in the upper part of the casing 67 arrange | positioned perpendicularly to the said magazine support 58. FIG. The drive shaft 70 is connected to the rotary shaft 69 of the motor 68 via the cup ring 71. Bevel gears 72 are fixed to the lower end of the drive shaft 70, and the bevel gears 72 are bevel gears 74 provided on the rotating shaft 75 horizontally supported through the bearings 73 and 73. In conjunction with, the rotational shaft 75 can be given rotation in the required direction. A barrel cam 76 having a cam groove 76a is formed on the rotary shaft 75, and a cam groove 76a is formed on the outer circumferential surface of the curved line. The radial groove is disposed on the index disc 80 in the cam groove 76a. Each cam follower 8 is fitted in order. The index cam is intermittently applied to the index disc 80 by the rotation of the barrel cam 76.

(About grip arm)

Next, the grip arm 82 of the element indexed by the above-mentioned rotary index mechanism, and the mechanism which oscillates and drives this grip arm for the hand of the tool holder 48 are demonstrated. As shown in FIG. 2 to FIG. 4, the magazine base 64 constituting a part of the tool magazine 66 has a clevis 81 at a desired center angle in the circumferential direction around the support shaft 60. Are arranged in sequence (10 in the city example). Each clevis 81 is supported so that the rod-shaped grip arm 82 can swing through the support shaft 84, and the free end of the arm faces radially outward. In the free end of the grip arm 82, as shown in FIG. 3, a second branch 83 having a dimension capable of clamping the annular groove 48a formed in the outer diameter portion of the tool holder 48. ) Is formed. In addition, at each inner end of the second branch 83, a hole 83a clogged in a direction orthogonal to the memorization portion is laid, and the compression coil spring 99 is formed in the blocked hole 83a. The support pin 98, which is suppressed by N, is accommodated so as to retreat, and the front end of the support pin 98 faces the inside of the second branch. Therefore, at both inner ends of the second branch 83, a pair of support pins 98 and 98 align their centers so that their ends face each other. Then, by aligning the second branch 83 of the grip arm 82 with the annular groove 48a of the tool holder 48, the pair of support pins 98, 98 cause the annular groove 48a. The tool holder 48 is gripped in contact with each other by being inserted into and contacted with the elasticity of the compression coil spring 99. Further, at each outer end of the second branch 83, the first cam follower 94, which has the center of rotation of the support pin 98 as its center of rotation, is rotatably provided. .

In addition, as shown in FIG. 2, an additional blocked hole 82a is also formed in the semi-free end of the grip arm 82, and the compressed coil spring 92 is formed in the blocked hole 82a. Together, the steel balls 90 are elastically stored so that a part of the steel balls 90 protrudes from the opening of the blind hole 82a. Moreover, as shown in FIG. 2, the grip support collar 88 which provided the guide surface 88a which has an arc-shaped cross section on the outer periphery is shown in the boss part 64a in the magazine base 64 outside. The steel ball 90 provided in the said grip arm 82 is fitted in this guide surface 88a, and can contact elastically. In addition, a notch groove 88b is provided on the magazine base 64 side of the guide surface 88a, and each grip arm 82 in the index standby state in FIG. 1 moves the steel ball 90 to the notch groove 88b. ), The arm 82 can be stably supported in the posture.

As shown in FIG. 1 and FIG. 5, it is the position of the half free end side of the arm length direction which clamps the pivoting shaft 84 with the pivoting point of the said grip arm 82, and is close to the pivoting shaft 84. FIG. The second cam follower 96 in the shape of a roller is supported so that it can rotate. The second cam follower 96 is able to correspond to the inclined surface movable cam surface 86a formed on the movable cam body 86 shown in Figs. That is, as shown in FIG. 1, FIG. 7 and FIG. 8, the movable cam body 86 is supported by the support shaft 93 on the vertical surface of the spindle head 24 and opposite to the tool magazine 66. As shown in FIG. It is axially supported, and the compression coil spring 85 is arrange | positioned between this movable cam body 86 and the spindle head 24, and the movable cam body 86 is made to be able to elastically float. As shown in FIGS. 5 and 7, the movable cam body 86 is formed to have a smaller width than the second branch 83, and the second branch 83 has the movable cam body 86 interposed therebetween. It can pass through the trajectory. In addition, as shown in FIG. 7, the lower surface trace 94b of the 1st cam follower 94 in the said 2nd branch part can also pass through the movable cam body 86 in between. As shown in FIG. 1, FIG. 5, FIG. 7, and FIG. 8, the fixed cam body 87 is fixed to the axial bottom of the main shaft head 24. As shown in FIG. The fixed cam body 87 has a cam surface 87a having a gentle curve in the front and an inclined surface subsequent thereto and a rear surface parallel to the bottom of the spindle head 24. The cam surface of the fixed cam body 87 is formed. The center trace 94a of the first cam follower 94 guided to 87a is made to coincide with the center of the annular groove portion 48a of the tool holder 48. In addition, as shown in FIG. 8, the center trace 96a of the 2nd cam follower 96 has the inclined surface shape which imitated the cam surface of the movable cam body 86. As shown in FIG.

The first cam follower 94 and the second cam follower 96 provided on the grip arm 82 are described later with reference to FIGS. 9 (a)-(j) and 10. By the reciprocating movement in the tool exchange area of the axis head 24 around the origin Z0, the cam surface 87a of the fixed cam body 87 and the cam surface 86a of the movable cam body 86 are respectively corresponded. Positioned for sliding contact. That is, when the spindle head 24 is reciprocated in the Z-axis direction, the first cam follower 94 is fixed to the fixed cam body 87 and the second cam follower 96 is movable cam body under the conditions described below. 86, the grip arm 82 makes a predetermined rocking motion about the pivoting shaft 84 under each corresponding cam action. At this time, the steel ball 90 installed in the semi-free end of the grip arm 82 is separated from the notch groove 88b formed in the grip support collar 88 to move according to the arc-shaped guide surface 88a.

(Operation of the device according to the embodiment)

Next, the operation of the automatic tool changer according to the embodiment configured as described above will be described with reference to FIGS. 9 (a) to (j). As described above, the spindle head 24 and the fixed cam body 87 and the movable cam body 86 provided thereon are screwed together with the ball screw 20 and the nut 18 by the rotation of the servomotor 22. While being subjected to the lifting and lowering movement in the Z-axis direction, the tool magazine 66 rotates the magazine base 64 by the rotation of the index motor 68 at the correct position on the frame 12 of each grip arm. The tool holder 48 supported by 82 is indexed. Therefore, the origin Z0 which becomes the reference | standard operation level of the main-axis head 24 is set throughout FIG. 9 (a)-(j). In addition, the operation timing of each member which concerns on FIG. 9 (a)-(j) is shown by chart in FIG.

9 (a) shows a state in which the work 91 is cut by the machine tool of the present invention. The lower open end of the main shaft 40 in the main shaft head 24 is located in the workpiece processing region below the origin Z0. In this state, the first cam follower 94 provided on the grip arm 82 The corresponding fixed cam body 87 is in a fully raised position. In addition, the second cam follower 96 is also at the position where the corresponding movable cam body 86 is fully raised, and the second branch 83 of the grip arm 82 is kept in the leftmost direction. have. That is, the second branch 83 is largely spaced apart from the specific tool holder 48 mounted on the tool support 42 of the main shaft 40, so that the main shaft head 24 is the workpiece 91 alone. It can be lowered toward to carry out the required cutting processing.

9 (b) shows a state in which the spindle head 24 leaves the workpiece 91 and rises to the tool change region. Since the second branch portion 83 of the grip arm 82 does not contact the movable cam body 86 which is narrower than the second branch portion 83 and is along the vertical side of the main shaft head 24, the main shaft head 24 ) Can rise freely.

FIG. 9 (c) shows a state in which the main shaft head 24 is raised via the state shown in FIG. 9 (b) so that the lower open end of the main shaft 40 substantially coincides with the origin Z0. The main shaft 40 is in a state of completion of orientation (rotational direction positioning), and the second cam follower 96 of the grip arm 82 is located in the middle of the movable cam body 86 and the grip arm 82 is located. ) Is swinging slightly counterclockwise around the pivoting shaft 84. Further, the first cam follower 94 of the grip arm 82 is located in the middle of the fixed cam body 87, whereby a pair of support pieces 98 and 98 provided in the second branch 83 are provided. (FIG. 3) is formed in the outer diameter portion of the tool holder 48 so as to coincide with the annular groove 48a located horizontally.

The first cam follower 94 at the free end of the grip arm 82 and the second cam follower 96 at the half free end side are respectively provided to the fixed cam body 87 and the movable cam body 86. Because of contact, the pivoting of the grip arm 87 when an error occurs, for example, when an error occurs in the mounting positions of both the cam bodies 86 and 87 or when a cutting object or the like is attached to the cam surface of the fixed cam body 87. Excessive force is applied to the shaft 84 or the like, but this force is absorbed by the elastic floating of the movable cam body 86.

Next, in order to replace the tool holder 48, the state in which the spindle head 24 has risen by the distance Z30, for example from the origin Z0 is shown in FIG. 9 (d). In the process of raising the spindle head 24 to this level, the plate cam 28 of the crank lever 30 shown in FIG. 1 comes into contact with the cam follower 26, and the crank lever 30 is tensioned. Rotation in the counterclockwise direction is started in response to the elasticity of the coil spring 34. In addition, as the spindle head 24 rises above the origin Z0, the movable cam body 86 is connected to the corresponding second cam follower 96 to further swing the grip arm 82 counterclockwise. . Thus, the second cam follower 94 is guided along the fixed cam body 87, and the pair of support pins 98, 98 provided at the second branch 83 of the grip arm 82 It moves in alignment with the annular groove 48a of the tool holder 48. The support pins 98 and 98 are retracted against the elasticity of the coil springs 99 and 99, thereby retracting. It is located on the centerline C.

At this point, the short lever 30a of the crank lever 30 starts to push down the pin 56 installed on the drawbar 46, and the holder for the pull stud 54 of the tool holder 48. The release of the clamping by the clamping portion 44 is started.

9 (e) shows a state in which the main shaft head 24 has risen by the distance Z50 from the origin Z0. As can be seen from FIG. 10, immediately before reaching this state, the crank lever 30 is fully oscillated, the holder clamping member 44 releases the pull stud 54, and unlocks the tool holder 48. The clamp is closed. The grip arm 82 oscillates further counterclockwise under the action of both cam surfaces 87a and 86a and the corresponding cam followers 94 and 96 so that the steel balls 90 of the arm 82 are moved. Is stabilized by falling in the notch groove 88b of the grip support collar 88, and the operation is completed. In addition, the support pins 98 and 98 of the two arm branches 83 grip the annular groove 48a of the tool holder 48 so that the grip of the tool holder 48 by the grip arm 82 is achieved. Is done.

From this point on, the drawing of the tool holder 48 is started. That is, the spindle head 24 further rises from the position shown in FIG. 9 (e). For example, as shown in FIG. 9 (f), the spindle head 24 is further moved by the distance Z138 from the origin Z0. When raised, the tool holder 48 used for the work of the workpiece 91 remains gripped by the grip arm 82, thereby pulling out the tool holder 48 (from the spindle head 24 to the tool magazine 66). India) is being completed. In this state, the index motor 68 described with reference to FIGS. 1 and 6 is rotationally driven, and the rotation index of the index disc 80 is made under the cam action of the barrel cam 76 and the cam follower 8. . For this reason, a separate grip arm 82 holding the tool holder 48 to be used next is positioned to align the center line C directly under the tool support portion 42 of the spindle head 24 (Fig. 9 ( g)).

Next, the process of fitting this newly indexed tool holder 48 to the tool support part 42 of the spindle head 24 is demonstrated. When the servomotor 22 is rotated in the opposite direction, under the action of screwing the ball screw 20 and the nut 18, the spindle head 24 is moved from the position of the distance Z138 shown in FIG. It descends to the position of distance Z50 indicated in (h). The arbor 52 of the tool holder 48 newly indexed by the lowering of the spindle head 24 is inserted into the tool support 42. In FIG. 9 (f) and (g), the first cam follower 94 is separated from the fixed cam body 87. However, the cam follower (9) reaches the state shown in FIG. 94 again contacts the corresponding fixed cam 87, and the cam follower 94 moves along the cam surface 87a to start the grip arm 82. That is, the grip pressure 82 starts the swing in the clockwise direction centering on the pivoting shaft 84, and the support pins 98 and 98 provided in the second branch 83 of the arm 82. The retracting operation follows the operation of the annular groove 48a formed in the tool holder 48. In addition, the second cam follower 96 is in contact with the movable cam body 86, and excessive force is not applied to the pivoting shaft 84 or the like of the grip arm 82, and to the elastic floating of the movable cam body 86. This force is absorbed by it.

Moreover, when the spindle head 24 descends to the distance Z30, as shown in FIG. 9 (i), the plate cam which is coupled to the cam follower 26 to the diameter and swings the crank lever 30 counterclockwise ( 28 begins to escape from the cam follower 26 and initiates clamping by the holder clamping member 44 against the pull stud 54 of the toolholder 48.

As shown in FIG. 9 (j), when the spindle head 24 further descends and reaches the origin Z0, the plate cam 28 in the crank lever 30 is completely separated from the cam follower 26. As a result, the holder clamping member 44 clamps the pull stud 54 to end the clamping operation. In addition, the grip arm 82 is interlocked with the fixed cam body 87 of the cam follower 94 so that the steel ball 90 provided at the tip of the arm is notched from the notch groove 88b of the grip support collar 88. Break away and swing clockwise. Then, the grip arm 82 is completely separated from the tool holder 48 fitted to the tool support 42. This allows the rotation of the spindle 40 and allows machining to the workpiece 91. Furthermore, when the spindle head 24 is lowered than the origin Z0, the grip arm 82 escapes further in the spacing direction as shown in FIG. 9A, for example, and the workpiece 91 by the spindle head 24. The single descent of is possible.

As described above, in the automatic tool changer of the present invention, the first cam follower is disposed in the vicinity of the second branch of the grip arm, and the swing arm moves in contact with the cam follower based on the thrust of the spindle head. And a cam surface for forming a cam surface for drawing out a tool holder mounted on the spindle is fixed from the side facing the tool magazine of the spindle head over the peripheral end surface of the tool holder mounting portion of the spindle. According to the present invention, the grip arm oscillation movement is performed reliably so that a stable automatic tool change is possible.

In addition, the automatic co-exchanging apparatus of the present invention is provided with a movable cam body which is elastically floatable on the side of the spindle head facing the tool magazine and is narrower in width than the second branch portion, and is provided with the first cam follower. A second cam follower may be provided on the grip arm on the opposite side with the swinging center in between, and in this case, a pivoting portion of the grip pressure in linkage between the grip arm and the spindle head. It is possible to perform stable automatic tool change quickly without applying excessive force, and do not require very high precision during machining of each cam body and processing of the pivoting part of the grip arm, and the manufacturing effect is easy. have.

Claims (2)

A tool holder with an annular groove angled to its outer circumference is supported so as to rotate a spindle having a clamping release mechanism capable of clamping and releasing, and a tool change area in the axial direction of the spindle with respect to the frame by a reciprocating drive mechanism. And a rotating index so as to swing each of a plurality of grip arms formed at a free end, each of which has a spindle head reciprocated over the workpiece machining area, and a two-branch portion fixed to the frame and cooperating with the annular groove to hold the tool holder. In a machine tool provided with a tool magazine installed so as to be able to automatically change a tool, a first cam follower is disposed near the second branch of the grip arm, and at the same time, a movement of the spindle head is performed. In contact with this cam follower to impart a rocking motion to the grip arm and to form a cam surface for drawing out the tool holder mounted on the main shaft. Body cam tool magazine device bridges a automatic tool machine of the plant, it characterized in that the fixed installed over the peripheral end face (端面) of the tool holder mounting portion of the spindle from the relative side of the spindle head. The movable cam body according to claim 1, wherein a movable cam body which is elastically movable on the side of the spindle head facing the tool magazine and which is narrower than the second branch is provided, and the first cam follower and the swing center And a second cam follower capable of contacting the cam surface of the movable cam body on the grip arm on the opposite side with the gap between them.

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