JP2006305663A - Automatic tool changer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect mounting failure when a tool holder having mounted a cutting tool is mounted to a tool holding part placed in a tool attaching/detaching position, and to prevent the tool holder from colliding with a spindle mounting the tool holder. <P>SOLUTION: The automatic tool changer is provided with a mounting failure detection mechanism 80 which detects the mounting failure of the tool holder 75 to a grip arm 38 placed in the tool attaching/detaching position for attaching/detaching the tool in a rotary type tool magazine. The mounting failure detection mechanism 80 is equipped with a pair of notch formed plate 81 mutually oppositely disposed on both sides of the rotational direction of the grip arm 38 at the tool attaching/detaching position. The notch formed plate 81 has a notch part 81b wherein a tapered engagement part 75a of the tool holder 75 correctly mounted to the grip arm 38 at the tool attaching/detaching position can pass through without contact, and the tapered engagement part 75a of the tool holder 75 incorrectly mounted to the grip arm 38 cannot pass through without contact. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an automatic tool changer provided with a tool magazine or pot having a plurality of tool holding portions in a rotatable manner, and in particular, a mounting failure of a tool holder with a cutting tool attached to the tool holding portion or the pot is detected. About things.

  Conventionally, in a machine tool such as a machining center configured to be able to perform various types of machining such as threading, drilling and counterboring on a workpiece in a single device, multiple types of cutting tools such as taps and drills are used. Are stored in advance in a predetermined storage location. Such a machine tool is provided with an automatic tool changer (so-called tool changer) that selects a desired cutting tool in a timely manner and automatically exchanges it with a used cutting tool.

  As this type of automatic tool changer, various types such as a grip method and a pot method have been proposed. Grip-type automatic tool changers are generally put into practical use with a plurality of grip arms arranged in a ring and equipped with a tool magazine that can be pivoted and indexed. Has been.

  For example, in the automatic tool changer for a machine tool disclosed in Patent Document 1, a tool magazine in which a plurality of tool pots are annularly arranged close to a main shaft is rotatably provided. Therefore, an operator sets a tool used for machining a workpiece in a tool holder, and attaches the tool holder to an empty grip arm. In this case, the tool holder is gripped by a pair of support pins provided at the two crotch portions of the grip arm in the V-shaped groove portion.

  At the time of tool change during machining, the spindle head is raised to a predetermined position (Z-axis origin), whereby the V-shaped groove portion of the tool holder on which the used tool is mounted is held by the grip arm. When the spindle head is further raised from that position, the spindle head rises in the vertical direction (Z-axis direction) in the holding state, so that the tool holder is extracted from the tool holding portion of the spindle head.

  Next, the magazine motor is driven, the magazine base is rotated, and another grip arm that holds a tool holder on which a tool to be used next is mounted is positioned directly below the tool holding portion of the spindle head. Then, the spindle head is lowered in the vertical direction, and the newly indexed tool holder is inserted into the tool holding portion of the spindle head, so that the tool is changed.

By the way, in general, the tool holder is formed with a keyway. When the toolholder is mounted on the spindle, the toolholder is positioned on the grip arm because the keyway of the toolholder is attached so as to match the positioning key on the spindle side. A key is provided. Therefore, when the tool is set in the tool holder, it is necessary to securely fit the positioning key provided on the grip arm into the key groove formed in the tool holder.
Japanese Examined Patent Publication No. 7-80109 (pages 4-5, FIG. 1)

  In the automatic tool changer for a machine tool described in Patent Literature 1, when a tool holder on which a tool is set is mounted on a grip arm, the key groove of the tool holder is not securely fitted to the positioning key of the grip arm In other words, even if an attachment failure occurs, the attachment failure is not detected at all.

  Therefore, when a mounting failure occurs, when the tool is replaced, the tool holder is transferred to the spindle with the position shifted, and the spindle and the tool holder collide when the spindle descends due to high-speed movement. In the worst case, the grip arm could be damaged.

  In particular, when the replacement position of the tool holder provided in the tool magazine is at a high place different from the low delivery position to be transferred to the spindle, it is difficult for the operator to mount the tool holder. There is a problem that the attachment to the grip arm tends to be incomplete.

  The automatic tool changer according to claim 1 is an automatic tool changer having a rotary magazine in which a plurality of tool holders holding a tool holder to which a cutting tool is attached are arranged on the circumference. A mounting failure detecting means for detecting mounting failure of the holder is provided.

  Since the automatic tool changer is provided with the mounting failure detection means, when the tool holder is mounted on the tool holding portion, if the mounting of the tool holder is incorrect, the mounting failure is detected.

  According to a second aspect of the present invention, there is provided the automatic tool changer according to the first aspect of the invention, wherein the mounting failure detecting means is provided at a tool attaching / detaching position for attaching / detaching a tool among a plurality of tool holding portions of the rotary magazine.

  According to a third aspect of the present invention, there is provided the automatic tool changer according to the second aspect of the invention, wherein the mounting failure detecting means is a pair of notches disposed opposite to each other in the rotational direction of the tool holding portion at the tool attachment / detachment position. The tool holder is provided with a forming plate, and the notch forming plate can pass through the taper engagement portion of the tool holder correctly attached to the tool holding portion at the tool attaching / detaching position in a non-contact manner and is poorly attached to the tool holding portion. The taper engaging portion has a notch portion that cannot pass through in a non-contact manner.

  According to a fourth aspect of the present invention, there is provided the automatic tool changer according to the third aspect of the invention, wherein the mounting failure detecting means is configured such that the taper engaging portion of the tool holder that is poorly mounted on the tool holding portion contacts the notch forming plate. A circuit interrupting section that is closed and an alarm means that electrically outputs an alarm when the circuit interrupting section is closed are provided.

  According to a fifth aspect of the present invention, there is provided the automatic tool changer according to the second aspect of the invention, wherein the attachment failure detecting means is defective in the taper engaging portion of the tool holder correctly attached to the tool holding portion at the tool attaching / detaching position and the tool holding portion. And a detection switch for detecting the taper engagement portion of the tool holder mounted on the tool holder in an identifiable manner.

  According to a sixth aspect of the present invention, there is provided the automatic tool changer according to the fifth aspect of the invention, wherein the detection switch is provided with a switching actuator that can be switched between a use position for detection and a retreat position retracted from the use position. It is a thing.

  According to a seventh aspect of the present invention, there is provided the automatic tool changer according to the fifth aspect of the present invention, wherein the automatic tool changer is provided with a rotating member that takes different postures between the state in which the tool holder is correctly mounted and the state in which the tool holder is improperly mounted. The switch performs detection via a rotating member.

  According to an eighth aspect of the present invention, there is provided the automatic tool changer according to the third aspect of the invention, wherein the mounting failure detecting means detects that the notch forming plate is pushed by the tool holder that is mounted in the tool holding portion. It has a mounting detection switch.

  According to a ninth aspect of the present invention, there is provided the automatic tool changer according to the first aspect of the invention, wherein the attachment failure detecting means is respectively provided in a perpendicular direction to tip portions of a pair of holding pins provided in the tool holding portion for holding the tool holder. A pair of stroke detection means having an output rod capable of abutment and capable of detecting the advance stroke of the output rod, and holding the tool holder correctly mounted upon receiving the output of the pair of stroke detection means A discriminating means for discriminating whether or not the tool holder is mounted based on the difference between the stroke of the output rod until it abuts on the pin and the stroke of the output rod until it abuts on the holding pin when the tool holder is improperly mounted; It is equipped with.

  According to a tenth aspect of the present invention, there is provided the automatic tool changer according to the first aspect, wherein a tool holding portion is provided at a tip end portion of the grip arm of the rotary magazine and engages with a key groove of a tool holder held by the tool holding portion. A key member is provided on the grip arm, and a key member is slidably attached to the tip end side arm portion of the grip arm in the length direction, and an elastic member is provided to elastically bias the key member toward the tool holding portion, The mounting failure detection means is configured to detect mounting failure of the tool holder via the key member.

  The automatic tool changer according to claim 11 is an automatic tool changer having a rotary magazine in which a plurality of tool holders for holding a tool holder to which a cutting tool is attached are arranged on the circumference. A tool insertion guide is provided for guiding the tool holder to be correctly attached to the tool holding part located at the tool attaching / detaching position for attaching / detaching the tool among the tool holding parts.

  Effective use of the tool insertion guide that guides correct tool holder installation enables correct tool holder installation to the tool holder located at the tool attachment / detachment position for tool attachment / detachment among multiple tool holders of the rotary magazine Is possible.

  The automatic tool changer according to claim 12, wherein the automatic tool changer has a pod-type magazine in which a plurality of pots holding a tool holder to which a cutting tool is attached are arranged in a substantially oval shape when viewed from the front. Mounting failure detecting means for detecting a mounting failure is provided.

  Since the automatic tool changer is provided with the mounting failure detection means, when the tool holder is mounted on the pot, if the mounting of the tool holder is incorrect, the mounting failure is detected.

  According to a thirteenth aspect of the present invention, there is provided the automatic tool changer according to the twelfth aspect of the invention, wherein the attachment failure detecting means is two sets of restricting members disposed opposite to each other in the moving direction of the tool holding portion at the tool attaching / detaching position. The restricting member is provided with a hook-like portion of the tool holder that is correctly attached to the tool holding portion at the tool attachment / detachment position so that the hook-like portion of the tool holder can pass in a non-contact manner and is poorly attached to the tool holding portion. It has a contact restricting portion that cannot pass through in a non-contact manner.

  According to a fourteenth aspect of the present invention, there is provided the automatic tool changer according to the thirteenth aspect, wherein the mounting failure detecting means is provided at a tool attaching / detaching position for attaching / detaching a tool among a plurality of pots of the pot type magazine.

  According to the invention of claim 1, in an automatic tool changer having a rotary magazine in which a plurality of tool holders holding a tool holder to which a cutting tool is attached are arranged on the circumference, a mounting failure detection means is provided, When the tool holder is installed in the tool holder of the rotary magazine, if the tool holder is not installed correctly, it can be detected and the collision between the spindle and the tool holder can be avoided. This can surely prevent the grip arm from being damaged.

  According to the invention of claim 2, since the mounting failure detecting means is provided at the tool mounting / removing position for tool mounting / removal among the plurality of tool holding portions of the rotary magazine, the tool positioned at the tool mounting / removing position for tool mounting / detaching. When the tool holder is mounted on the holding portion, the mounting failure can be reliably detected. Other effects similar to those of the first aspect are obtained.

  According to a third aspect of the present invention, the mounting failure detecting means includes a pair of notch forming plates disposed opposite to each other in the rotational direction of the tool holding portion at the tool attaching / detaching position. The taper engaging part of the tool holder correctly attached to the tool holding part at the tool attaching / detaching position can be passed through the plate in a non-contact manner, and the taper engaging part of the tool holder not properly attached to the tool holding part is not in contact with the plate. Therefore, when the tool holder is poorly mounted on the tool holder, the taper engaging portion of the tool holder contacts the notch forming plate, and the contact of the rotary magazine The rotation can be stopped, and the collision between the spindle and the tool holder can be easily and reliably prevented. Other effects similar to those of the second aspect are achieved.

  According to the invention of claim 4, the mounting failure detection means includes a circuit interrupting portion that is closed when the taper engaging portion of the tool holder that is poorly mounted on the tool holding portion contacts the notch forming plate, Alarm means that electrically outputs an alarm when this circuit interrupting part is closed, so that a faulty attachment of the tool holder to the tool holding part can be recognized by the alarm, and collision between the spindle and the tool holder is easy It is possible to prevent it reliably. Other effects similar to those of the third aspect are achieved.

  According to the invention of claim 5, the mounting failure detection means includes a taper engaging portion of the tool holder that is correctly mounted on the tool holding portion at the tool attaching / detaching position, and a taper of the tool holder that is incorrectly mounted on the tool holding portion. Since it has a detection switch that detects the engagement portion in an identifiable manner, it is possible to easily detect a mounting failure of the tool holder based on a detection signal output from the detection switch. Other effects similar to those of the second aspect are achieved.

  According to the sixth aspect of the present invention, since the switch is provided so that the detection switch can be switched between the use position for detection and the retreat position retracted from the use position, the detection switch is used at the use position. By switching from the retracted position to the retracted position, the mounting operation for mounting the tool holder on the tool holding portion is not obstructed, the breakage of the detection switch can be avoided, and the mounting operation can be speeded up. Other effects similar to those of the fifth aspect are obtained.

  According to the invention of claim 7, there is provided a rotating member that takes different postures in a state in which the tool holder is correctly mounted and a state in which the tool holder is incorrectly mounted, and the detection switch is interposed via the rotating member. Therefore, it is possible to easily detect a mounting failure of the tool holder based on the detection signal from the detection switch according to the rotation position of the rotation member with a simple configuration in which only the rotation member is provided. it can. Other effects similar to those of the fifth aspect are obtained.

  According to the invention of claim 8, since the mounting failure detection means has a failure mounting detection switch that detects that the notch forming plate has been pushed by the tool holder that is mounted to the tool holding portion. With a simple configuration in which only the mounting detection switch is provided, the mounting failure of the tool holder can be easily detected based on the detection signal from the defective mounting detection switch. Other effects similar to those of the third aspect are achieved.

  According to the ninth aspect of the present invention, the attachment failure detecting means has an output rod that can be brought into contact with the front ends of a pair of holding pins provided in the tool holding portion for holding the tool holder, respectively. And a pair of stroke detection means capable of detecting the advancing stroke of the output rod, and an output rod until receiving the output of the pair of stroke detection means until the tool holder is properly attached to the holding pin And a discriminating means for discriminating whether or not the tool holder is mounted based on the difference between the stroke of the output rod and the stroke of the output rod until it comes into contact with the holding pin when the tool holder is poorly mounted. With only a simple configuration, it is possible to easily detect a mounting failure of the tool holder based on the stroke of the output rod. Other effects similar to those of the first aspect are obtained.

  According to the invention of claim 10, a tool holding portion is provided at a tip portion of the grip arm of the rotary magazine, and a key member that engages a key groove of a tool holder held by the tool holding portion is provided on the grip arm. A key member is slidably attached to the tip arm portion of the grip arm in the length direction, and an elastic member is provided to elastically bias the key member toward the tool holding portion. Since the tool holder is not properly mounted via the tool holder, it is possible to easily detect the tool holder mounting failure with a simple configuration in which only the elastic member and the key member are provided. Other effects similar to those of the first aspect are obtained.

  According to the invention of claim 11, in the automatic tool changer having a rotary magazine in which a plurality of tool holding portions for holding a tool holder to which a cutting tool is attached are arranged on the circumference, a plurality of tools of the rotary magazine is provided. Since the tool insertion guide that guides the tool holder to be installed correctly to the tool holding unit located at the tool attachment / detachment position for attaching / detaching the tool among the holding parts is provided, by effectively utilizing the tool insertion guide, The tool holder can be correctly attached to the tool holding portion located at the tool attachment / detachment position, and the collision between the spindle and the tool holder can be easily and reliably prevented.

  According to the invention of claim 12, in the automatic tool changer having a pod-type magazine in which a plurality of pots holding a tool holder to which a cutting tool is attached are arranged in a substantially oval shape when viewed from the front, the tool holder to the pot Since there is a mounting failure detection means for detecting a mounting failure, when a tool holder is mounted on a pot of a pot-type magazine, if the tool holder is not mounted correctly, the mounting failure can be detected. Therefore, the collision between the main shaft and the tool holder can be avoided, and the breakage of the grip arm can be surely prevented.

  According to a thirteenth aspect of the present invention, the mounting failure detecting means includes two sets of restricting members disposed opposite to each other in the movement direction of the pot at the tool attaching / detaching position, and the restricting member is the tool attaching / detaching position. A contact restricting portion in which the hook-shaped portion of the tool holder correctly mounted in the pot of the tool holder can pass in a non-contact manner and the hook-shaped portion of the tool holder that is incorrectly mounted in the tool holding portion cannot pass in a non-contact manner. Therefore, when the tool holder is poorly attached to the pot, the hook-shaped portion of the tool holder comes into contact with the contact restricting portion of the restricting member, and the contact makes it possible to stop the rotation of the pot type magazine. The collision between the spindle and the tool holder can be easily and reliably prevented. Other effects similar to those of the twelfth aspect are achieved.

  According to the fourteenth aspect of the present invention, since the attachment failure detecting means is provided at the tool attaching / detaching position for attaching / detaching the tool among the plurality of pots of the pot-type magazine, the tool holding portion located at the tool attaching / detaching position for attaching / detaching the tool When the tool holder is attached to the tool holder, the attachment failure can be reliably detected. Other effects similar to those of the thirteenth aspect are achieved.

  The automatic tool changer according to the present invention includes a tool holder attached to a tool holding portion located at a tool attaching / detaching position for tool attachment / detachment among a plurality of tool holding portions of a rotary magazine having a plurality of tool holding portions arranged on a circumference. The mounting failure is mechanically detected using a notch forming plate having a notch when the tool holder rotates.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the machine tool 1 is not illustrated, but an XY axis moving device (not shown) that moves the main shaft 22 in the X direction and the Y direction orthogonal to each other, and a Z axis that moves the main shaft 22 up and down. The moving device 5, the main shaft driving device 20 that rotationally drives the main shaft 22, the automatic tool changer 2 that automatically transfers the tool holder 75 to the main shaft 22, and a pallet changing device (not shown). However, the machine tool 1 is integrally provided with a numerical controller 9 that controls each of the plurality of moving mechanisms and driving mechanisms.

  The automatic tool changer 2 provided in the machine tool 1 includes a vertical column 3, a frame 4 extending leftward from the column 3, a spindle head 6 that can be reciprocated in the Z-axis direction by a Z-axis moving device 5, The frame 4 is provided with a rotary tool magazine 8 and the like which are arranged through a magazine support 7 and can be indexed by rotation.

  First, the Z-axis moving device 5 will be briefly described with reference to FIG. A guide rail 11 is fixed to the frame 4 in the vertical direction at the side thereof. A spindle head 6 is attached to the guide rail 11 via a pair of sliding pieces 12 arranged in the vertical direction so as to be movable up and down along the guide rail 11 in the Z-axis direction. A nut 13 is fixed to the support frame 4a that supports the spindle head 6 at an appropriate position. The nut 13 is screwed into a rotatable ball screw 14 supported in parallel along the guide rail 11.

  By rotating the ball screw 14 in both forward and reverse directions by a Z-axis motor 15 disposed above the frame 4, the spindle head 6 is driven up and down in the Z-axis direction along the guide rail 11 by the nut 13 and the ball screw 14. .

  Next, the spindle drive device 20 will be described with reference to FIG. Inside the spindle head 6, a spindle 22 having a tool mounting portion 21 at the lower end portion is rotatably arranged vertically. The main shaft 22 is connected to a main shaft motor 23 provided above the frame 4 via a coupling 24 and is driven to rotate by the main shaft motor 23.

  The tool mounting portion 21 can be fitted with a taper engaging portion 16 in a tool holder 75 having a cutting tool 74 mounted on the tip. When the tool holder 75 is inserted into the tool mounting portion 21, the pull stud 75 b provided at the tip portion of the tool holder 75 is clamped by the holder holding portion 25 provided inside the main shaft 22. When the holder clamping portion 25 is pressed by a draw bar 26 that is coaxially inserted into the central through hole of the main shaft 22, the clamp of the pull stud 75 b by the holder clamping portion 25 is released, and the tool holder 75 can be removed. .

  In order to clamp the tool holder 75 inserted in the tool mounting portion 21 and release the clamp, a crank lever 28 described later and a cam mechanism for imparting a swinging motion to the crank lever 28 are provided. A substantially L-shaped crank lever 28 is pivotally supported at an appropriate position of the spindle head 6 via a support shaft 27. The crank lever 28 includes a short lever 28a integrally formed in the horizontal direction and a long lever 28b integrally formed in the vertical direction. The distal end portion of the short lever 28 a can be engaged with a pin 29 that projects orthogonally to the draw bar 26.

  Further, a plate cam 30 having an inclined surface is fixed to the long lever 28b, and the plate cam 30 can be engaged with and disengaged from the cam follower 31 provided in the Z-axis motor 15 so as to be positioned on the movement locus. It has become. A tension coil spring 32 is interposed between the long lever 28b and the spindle head 6, and the crank lever 28 is always urged clockwise to release the pressing of the pin 29 by the short lever 28a.

  When the spindle head 6 is raised by driving the Z-axis motor 15, the plate cam 30 provided on the crank lever 28 is engaged with the cam follower 31 at the fixed position in the raising process, and the crank lever 28 is centered on the support shaft 27. Add counter-clockwise movement. As a result, the short lever 28a presses the pin 29 downward, biases the holder holding portion 25 via the draw bar 26, and releases the clamp of the tool holder 75 from the pull stud 75b.

  Next, the tool magazine 8 will be described. As shown in FIGS. 2 and 3, the magazine support 7 is provided with a support shaft 35 which is adjacent to the tool change area of the spindle head 6 and which is directed obliquely to the lower left. A cylindrical magazine base 36 with a flange is pivotally supported on the support shaft 35 via a bearing 37. In the magazine base 36, a plurality of (for example, ten) grip arms 38 each having a tool holding portion 38A at the front end portion are arranged radially and swingably at equal intervals in the circumferential direction.

  In addition, an indexing disc 39 centering on the support shaft 35 is fixed to the magazine base 36 by bolts 40. A plurality of roller-shaped cam followers 41 are provided on one side surface of the indexing disc 39 so as to correspond to the positions where the grip arms 38 are disposed.

  Next, the drive system of the tool magazine 8 will be described. As shown in FIGS. 2 and 6, a magazine motor 46 is arranged upside down on the upper portion of the casing 45 arranged vertically to the magazine support 7. A connecting shaft 47 is connected to the drive shaft 46 a of the magazine motor 46 through a coupling 48. A bevel gear 49 is fixed to the lower end portion of the connecting shaft 47, a bevel gear 52 fixed to a rotating shaft 51 rotatably supported by a bearing 50 meshes with the bevel gear 49, and the rotating shaft 51 can be rotated by a magazine motor 46. It has become.

  The rotating shaft 51 is provided with a barrel cam 53 in which a cam groove 53a having a predetermined curve in which a straight line portion and a screw portion are continuously formed is formed on the outer peripheral surface, and the indexing disc 39 is formed in the cam groove 53a. The cam followers 41 arranged radially can be sequentially fitted. By the rotation of the barrel cam 53, intermittent indexing rotation is given to the indexing disc 39.

  Next, a description will be given of the grip arm 38 that is radially arranged in the tool magazine 8 and has a tool holding portion 38A formed at the tip.

  As shown in FIGS. 2 to 4, ten grip arms 38 are radially arranged on the magazine base 36 constituting a part of the tool magazine 8. In the magazine base 36, ten clevises 56 are sequentially arranged at a required central angle in the circumferential direction around the support shaft 35. A rod-like grip arm 38 is pivotally supported on each clevis 56 via a pivot shaft 57 so that the free end of the grip arm 38 faces radially outward.

  As shown in FIG. 4, at the free end of the grip arm 38, there is formed a non-opening / closing forked portion 38a set to a size capable of sandwiching a V groove 75e provided around the outer diameter portion of the tool holder 75. Yes. A dead end hole 38b is formed in each of the bifurcated portions 38a in a direction perpendicular to the length direction of the grip arm 38.

  Each dead hole 38b accommodates a holding pin 60 that is elastically pressed by the coil spring 59 so that the holding pin 60 can be retracted, and the front end of each holding pin 60 faces the inside of the fork. That is, the tool holding portion 38A is configured by the bifurcated portion 38a and the pair of holding pins 60, and the plurality of tool holding portions 38A are arranged on the circumference.

  Therefore, when the V groove 75e of the tool holder 75 is positioned and pushed into the bifurcated portion 38a of the grip arm 38, the pair of holding pins 60 are inserted through the V groove 75e, and the tool holder 59 is pressed from both sides by the spring force of the coil spring 59. The tool holder 75 can be held in a state where the 75 is sandwiched. However, a first cam follower 61 having a rotation center at the center of the holding pin 60 is rotatably provided at each outer end of the bifurcated portion 38a.

  As shown in FIG. 3, another dead end hole 38 c is also drilled at the inner free end of the grip arm 38. A steel ball 63 is held together with the coil spring 62 in the dead hole 38c, and a part of the steel ball 63 protrudes from the opening of the dead hole 38c. The boss portion 36a of the magazine base 36 is fitted with a grip support collar 64 having a guide surface 64a having an arcuate cross section on the outer periphery, and a steel ball 63 provided on the grip arm 38 is elastically provided on the guide surface 64a. Can be contacted.

  A notch groove 64b is provided around the guide base 64a on the magazine base 36 side. In FIG. 3, each grip arm 38 in the indexing standby state engages the steel ball 63 with the notch groove 64b, so that the grip arm 38 is stably held in its posture.

  As shown in FIG. 3, a second cam follower 65 having a roller shape is pivotally supported at a position close to a pivot shaft 57 serving as a pivot point of the grip arm 38. The second cam follower 65 can be brought into contact with a sloped movable cam surface formed on the movable cam body 66 (see FIG. 2).

  Here, the magazine base 36 and the plurality of grip arms 38 are covered with an umbrella-shaped front cover 70 inclined on the front side thereof, and on the rear side thereof with a plate-shaped rear cover 71 (see FIGS. 1 and 9). Covered. The front cover 70 and the rear cover 71 prevent the chips cut out when the cutting tool 74 is used for cutting from entering the magazine base 36.

  In this case, since the uppermost position of the rotary tool magazine 8 is set as the tool attaching / detaching position, it is easy to attach / detach the replacement tool holder 75 to / from the grip arm 38 located at the tool attaching / detaching position which is the uppermost position. Thus, a substantially U-shaped notch 71 a is formed in the upper end portion of the rear cover 71 corresponding to the tool attachment / detachment position.

  When changing the tool, if the spindle head 6 moves to the Z-axis origin position (not shown), it is used by the spring force of the holding pin 60 and the coil spring 59 of the bifurcated portion 38a of the grip arm 38 located at the lowermost end of the tool magazine 8. The tool holder 75 to which the cutting tool 74 is attached is held in the V groove 75e. Thereafter, the spindle head 6 moves up to the tool change position (FIG. 9) in the vertical direction, so that the tool holder 75 is extracted from the tool mounting portion 21 of the spindle head 6.

  Next, the magazine base 36 is rotated by the rotational drive of the magazine motor 46, and the grip arm 38 holding the tool holder 75 to which the cutting tool 74 to be used in the next cutting operation is held is attached to the tool mounting portion 21 of the spindle head 6. Moves directly under and is positioned. Thereafter, since the spindle head 6 is moved downward in the vertical direction, the newly indexed tool holder 75 is inserted into the tool mounting portion 21 of the spindle head 6 to complete the tool exchange.

  Next, among the plurality of tool holding portions 38A of the rotary type tool magazine 8, the attachment for detecting the attachment failure of the tool holder 75 to the grip arm 38 (tool holding portion 38A) located at the tool attaching / detaching position for attaching / detaching the tool. The defect detection mechanism will be described. Here, prior to the description, the tool holder 75 will be briefly described.

  As shown in FIG. 7, the tool holder 75 includes a taper engagement portion 75a (taper shank portion) which is a main body portion thereof, a pull stud 75b integrally formed at one end portion of the taper engagement portion 75a, and a taper engagement. The flange portion 75c is formed integrally with the other end portion of the joint portion 75a, and the collet chuck 75d is formed integrally with the flange portion 75c and on which the cutting tool 74 is mounted. However, an annular V-shaped groove 75e to be held by the grip arm 38 is formed in the bowl-shaped portion 75c, and a pair of key grooves 75f are recessed.

  On the other hand, a key member 42, which is a small plate member that engages with the key groove 75f when the tool holder 75 is mounted, is fixed to the proximal end portion of the bifurcated portion 38a of the grip arm 38. However, the distal end portion of the key member 42 partially protrudes from the proximal end portion of the bifurcated portion 38 a and can be engaged with the key groove 75 f of the tool holder 75. Therefore, when the tool holder 75 is attached to the grip arm 38 at the tool attachment / detachment position, in the correct apparatus state in which the key member 42 of the grip arm 38 is securely fitted in the key groove 75f of the tool holder 75, FIG. As shown, the tool holder 75 is held in the proper mounting position closest to the grip arm 38.

  However, when the tool holder 75 is attached to the grip arm 38, the key member 42 of the grip arm 38 is not fitted in the key groove 75f of the tool holder 75, that is, the attachment position of the tool holder 75 to the grip arm 38 is delicate. 8-2, the tool holder 75 is not detached from the grip arm 38, and the grip arm 38 is displaced (separated from the normal mounting position). ) It is held in a defective mounting position.

  In this way, when the tool holder 75 held by the grip arm 38 is moved to the lower delivery position of the main shaft 22 in a poorly mounted state, the tool holder 75 and the tool holder 75 The main shaft 22 may collide and the grip arm 38 may be damaged. Therefore, the mounting failure of the tool holder 75 is detected by the mounting failure detection mechanism 80 to prevent the grip arm 38 from being damaged.

  Next, the mounting failure detection mechanism 80 will be described. As shown in FIGS. 9 and 10, the metal support plate 7 is made of a metal plate having a predetermined thickness at a predetermined portion corresponding to the grip arm 38 (tool holding portion 38A) located at the tool attachment / detachment position. A pair of left and right notch forming plates 81 are disposed on opposite sides of the grip arm 38 in the rotational direction. These notch forming plates 81 are integrally connected by a connecting plate 81a at the lower end thereof, and are fixed to the magazine support 7 by a fixing screw 82 via the connecting plate 81a.

  However, the rear ends of these notch forming plates 81 are attached to the rear cover 71 by welding or the like over the entirety, and the rigidity of the notch forming plate 81 is enhanced. By the way, in each of these notch forming plates 81, as shown in FIG. 10, a taper engaging portion 75a of the tool holder 75 correctly mounted on the grip arm 38 at the tool mounting position can pass without contact. Notch portions 81b are respectively formed. However, the notch portion 81b is not allowed to pass through the taper engagement portion 75a of the tool holder 75 that is poorly attached to the grip arm 38 in a non-contact manner.

Next, the operation of the mounting failure detection mechanism 80 configured as described above will be described.
The operator attaches the tool holder 75 to which the cutting tool 74 used in the next cutting operation is attached to the grip arm 38 positioned at the tool attaching / detaching position which is the uppermost position of the tool magazine 8 as described above. After the tool holder 75 is mounted on the grip arm 38, cutting is started by the numerical controller 9 based on the control program, and the magazine motor is used when the cutting tool 74 of the newly mounted tool holder 75 is used. When 46 is driven, the magazine base 36 is rotated in a predetermined rotation direction.

  As described above, when the newly installed tool holder 75 is correctly attached to the grip arm 38 when the magazine base 36 is rotated in a predetermined direction, the taper engaging portion 75a of the tool holder 75 is It can pass through the notch 81b of the notch forming plate 81 provided on the rotation direction side in a non-contact manner. In this case, the newly indexed tool holder 75 is moved to the lower delivery position of the spindle 22 and is securely attached to the tool mounting portion 21 of the spindle head 6 by the downward movement of the spindle 22.

  However, when the newly indexed tool holder 75 is poorly attached to the grip arm 38, the taper engaging portion 75a of the tool holder 75 is provided on the notch forming plate 81 provided on the rotation direction side. It cannot pass through the notch 81b in a non-contact manner. As a result, the rotation load of the magazine base 36 is increased, while the rotation torque of the magazine motor 46 is relatively small, so that the rotation of the magazine base 36 is stopped.

  As described above, the pair of notch forming plates 81 disposed opposite to each other in the rotational direction of the grip arm 38 at the tool attaching / detaching position is provided, and the notch forming plate 81 is provided with the grip arm 38 at the tool attaching / detaching position. The taper engagement portion 75a of the tool holder 75 correctly mounted on the (tool holding portion 38A) can pass through in a non-contact manner, and the taper engagement of the tool holder 75 that is poorly mounted on the grip arm 38 (tool holding portion 38A). Since the joint portion 75a has a notch portion 81b that cannot pass through in a non-contact manner, the taper engaging portion 75a of the tool holder 75 is notched-formed plate 81 when the tool holder 75 is poorly attached to the grip arm 38. The rotation of the rotary tool magazine 8 can be stopped by the contact, and the collision between the spindle 22 and the tool holder 75 can be easily and reliably prevented.

Next, a modified example in which the above embodiment is partially modified will be described.
[1] The mounting failure detection mechanism 80A described above is partially changed so that the taper engagement portion 75a of the tool holder 75 that is poorly mounted on the grip arm 38 makes the notch portion 81b of the notch forming plate 81A non-contact. Thus, it is possible to electrically detect the state incapable of passing (see FIGS. 11 to 13).

  As shown in FIGS. 11 and 12, a pair of left and right pairs of metal plates having a predetermined thickness is formed on a predetermined portion corresponding to the grip arm 38 located on the magazine support base 7 at the tool attaching / detaching position. The notch forming plates 81A are disposed on opposite sides of the grip arm 38 in the rotational direction, and these notch forming plates 81A are integrally connected by a connecting plate 81a at the lower end thereof. However, the pair of notch forming plates 81A is fixed to the rear cover 71 via a rubber sheet 83 on the back surface thereof and fixed to the magazine support base 7 via a rubber sheet 84 attached to the lower side thereof. It is fixed with screws 82.

  That is, the pair of notch forming plates 81 </ b> A is reliably insulated from the magazine support base 7 and the rear cover 71. Here, the insulating part by the rubber sheets 83 and 84 corresponds to the circuit interrupting part. Also in this case, the taper engagement portion 75a of the tool holder 75 correctly attached to the grip arm 38 at the tool attachment position can pass through the notch portion 81b in a non-contact manner, and is poorly attached to the grip arm 38. The taper engaging portion 75a of the tool holder 75 cannot pass through the notch portion 81b in a non-contact manner.

  Next, the control system will be described. Each notch forming plate 81A is provided with a first contact 85, and as shown in FIG. 13, these first contacts 85 are connected to the control unit (C / U) via connection lines. It is connected to 100 input / output ports. On the other hand, a second contact 86 is provided on each magazine support 7, and the second contact 86 is connected to an input / output port of the control unit 100 via a connection line. An alarm buzzer 101 is further connected to the control unit 100.

  Here, the control unit 100, the alarm buzzer 101, and the like constitute an alarm means. In this case, even if the magazine support 7, the magazine base 36 connected thereto, the grip arm 38 pivotally attached thereto, and the tool holder 75 attached thereto are electrically short-circuited, As described above, since the pair of notch forming plates 81A is reliably insulated from the magazine support base 7 and the rear cover 71, the first contact 85 and the second contact 86 are always open. is there.

  However, as will be described later, since the tool holder 75 is poorly attached to the grip arm 38, when the tool holder 75 and the notch forming plate 81A come into contact, the notch forming plate 81A and the magazine base 36 are brought into contact with each other. Since the circuit is electrically short-circuited, the first contact 85 and the second contact 86 are closed.

Next, the operation of the mounting failure detection mechanism 80A configured as described above will be described.
As in the above-described embodiment, when the magazine motor 46 is driven and the magazine base 36 is rotated in a predetermined rotation direction in order to determine the newly mounted tool holder 75 after cutting is started, the operator performs If the mounting state of the tool holder 75 to the grip arm 38 at the tool attachment / detachment position is normal, the taper engaging portion 75a of the tool holder 75 is not in the notch portion 81b of the notch forming plate 81A provided on the rotation direction side. Since the first contact 85 and the second contact 86 can be opened by contact, the alarm buzzer 101 is not sounded by the control unit 100.

  However, when the newly mounted tool holder 75 is poorly mounted on the grip arm 38, the taper engaging portion 75a of the tool holder 75 is provided on the notch forming plate 81A provided on the rotation direction side. When it is impossible to pass through the notch 81b in a non-contact manner, the first contact 85 and the second contact 86 are closed as described above, so that the alarm buzzer 101 sounds by the control unit 100.

  Therefore, the operator can reliably recognize the mounting failure of the tool holder 75 by the buzzer sound. At the same time, at least the magazine motor 46 can be brought to an emergency stop, and damage to the grip arm 38 holding the tool holder 75 can be reliably prevented.

[2] A defective mounting detection mechanism 80B obtained by partially changing the above-described defective mounting detection mechanism 80 is provided, and it is defective that the notch forming plate 81B is pushed by the tool holder 75 that is poorly mounted on the grip arm 38. You may make it detect with mounting | wearing detection switches 87 and 88 (refer FIGS. 14-16).

  As shown in FIGS. 14 and 15, a pair of left and right pairs of metal plates having a predetermined thickness is formed on a predetermined portion corresponding to the grip arm 38 located on the magazine support base 7 at the tool attaching / detaching position. A notch forming plate 81B is disposed on opposite sides of the grip arm 38 in the rotational direction. These notch forming plates 81B are integrally connected to each other at a lower end portion thereof by a connecting plate 81a, and are fixed to the magazine support base 7 with fixing screws 82.

  Also in this case, each notch forming plate 81B is formed with a notch portion 81b similar to that of the above embodiment. Further, a first defect mounting detection switch 87 is provided close to the outside (right side) of the right notch forming plate 81, and a second defect is provided outside the left notch forming plate 81 (left side). A mounting detection switch 88 is provided in proximity.

  Next, the control system will be described. As shown in FIG. 16, the first and second defective mounting detection switches 87 and 88 are connected to the input / output ports of the control unit 100 (C / U) via connection lines, respectively. Has been. An alarm buzzer 101 is connected to the control unit 100.

Next, the operation of the mounting failure detection mechanism 80B configured as described above will be described.
In the same manner as in the above embodiment, when the magazine motor 46 is driven and the magazine base 36 is rotated in a predetermined rotation direction in order to index the newly mounted tool holder 75 after the cutting process is started, it is determined by the operator. When the mounting state of the tool holder 75 to the grip arm 38 at the tool attachment / detachment position is correct, the taper engaging portion 75a of the tool holder 75 is not in the notch portion 81b of the notch forming plate 81B provided on the rotation direction side. Since it can pass by contact, the first or second defective attachment detection switches 87 and 88 are in an open state, and the alarm buzzer 101 does not sound by the control unit 100.

  However, when the newly mounted tool holder 75 is poorly mounted on the grip arm 38, the taper engaging portion 75a of the tool holder 75 is provided on the notch forming plate 81B provided on the rotation direction side. When it is impossible to pass through the notch 81 b in a non-contact manner, the notch forming plate 81 B on the rotation direction side is pushed by the tool holder 75.

  As a result, the first or second defective mounting detection switches 87 and 88 provided just outside the notch forming plate 81B are closed by the pushing of the notch forming plate 81B. Sounds. Thus, the operator can reliably recognize the mounting failure of the tool holder 75 by the buzzer sound. At the same time, at least the magazine motor 46 can be stopped at an emergency, and the breakage of the grip arm 38 holding the tool holder 75 can be surely prevented.

[3] A mounting failure detection mechanism 80C obtained by partially changing the mounting failure detection mechanism 80 described above is provided, and a pull stud 75b that is a part of the tool holder 75 that is correctly mounted on the grip arm 38 at the tool mounting position, and a grip The pull stud 75b of the tool holder 75 that is poorly attached to the arm 38 may be detected by the detection sensor 89 so as to be distinguishable (see FIGS. 17 and 18).

  As shown in FIG. 17, the normal attachment detection sensor 89 made of a proximity sensor is attached to a predetermined portion corresponding to the tool attachment position of the rear cover 71 on the extension of the axis of the tool holder 75 correctly attached to the grip arm 38. In addition, it is provided in an obliquely inclined manner so as to approach the pull stud 75b. That is, whether or not the tool holder 75 is attached to the grip arm 38 can be identified by the normal attachment detection sensor 89 based on whether or not the proximity state of the pull stud 75b is detected.

  Next, the control system will be described. As shown in FIG. 18, the normal mounting detection sensor 89 and the mounting state confirmation switch 90 are connected to the input / output port of the control unit (C / U) 100. An alarm buzzer 101 is connected to the control unit 100.

Next, the operation of the mounting failure detection mechanism 80C configured as described above will be described.
The operator attaches the tool holder 75 to which the cutting tool 74 used in the next cutting operation is attached to the grip arm 38 positioned at the tool attaching / detaching position which is the uppermost position of the tool magazine 8 as described above. After the tool holder 75 is attached to the grip arm 38, when the operator operates the attachment state confirmation switch 90, the control unit 100 reads a detection signal from the normal attachment detection sensor 89.

  When the detection signal read by the control unit 100 is a normal mounting signal for detecting the proximity state of the pull stud 75b, and the operator is correctly mounting the tool holder 75 on the grip arm 38, the control unit 100 Does not sound the alarm buzzer 101.

  However, when the detection signal read by the control unit 100 is a mounting failure signal for detecting the non-proximity state of the pull stud 75b, and the mounting state of the tool holder 75 to the grip arm 38 by the operator is defective. The alarm buzzer 101 sounds by the control unit 100.

  Thus, the operator can reliably recognize the mounting failure of the tool holder 75 by the buzzer sound. At the same time, at least the magazine motor 46 can be brought to an emergency stop, and damage to the grip arm 38 holding the tool holder 75 can be surely prevented. However, the taper engagement portion 75 a of the tool holder 75 may be detected by the normal mounting detection sensor 89 so as to be identifiable.

[4] A mounting failure detection mechanism 80D in which the above-described mounting failure detection mechanism 80 is partially changed is provided, and the normal mounting detection sensor 89 provided in the above-described modified form [2] is used for detection, and this use Switching may be performed by the switching cylinder 102 (which corresponds to a switching actuator) over the retracted position retracted from the position (see FIGS. 19 and 20).

  That is, as shown in FIG. 19, a predetermined portion corresponding to the tool mounting position of the rear cover 71 is partially cut out, and the switching cylinder 102 is fixed to the magazine support 7 corresponding to the cutout. A normal mounting detection sensor 89 is fixed to the tip of the piston rod of the switching cylinder 102 through a mounting plate 103 in an inclined manner.

  In this case, when the piston rod of the switching cylinder 102 is in the retracted state, the normal mounting detection sensor 89 is switched to the retracted position (shown by a solid line) retracted to the rear side of the rear cover 71, while the piston of the switching cylinder 102 When the rod is in the advanced state, the normal mounting detection sensor 89 is switched to the use position (illustrated by a two-dot chain line) moved to the front side of the rear cover 71. When the normal mounting detection sensor 89 is switched to its use position, whether the tool holder 75 is mounted on the grip arm 38 is identified based on whether the normal mounting detection sensor 89 detects the proximity state of the pull stud 75b. It is possible.

  Next, the control system will be described. As shown in FIG. 20, a normal mounting detection sensor 89 and a mounting state confirmation switch 90 are connected to an input / output port of a control unit (C / U) 100 as a control device. In addition, an alarm buzzer 101 and a switching cylinder 102 are connected.

Next, the operation of the mounting failure detection mechanism 80D configured as described above will be described.
The operator attaches the tool holder 75 to which the cutting tool 74 used in the next cutting operation is attached to the grip arm 38 positioned at the tool attaching / detaching position which is the uppermost position of the tool magazine 8 as described above. After the tool holder 75 is mounted on the grip arm 38, when the mounting state confirmation switch 90 is operated by the operator, the control unit 100 drives the switching cylinder 102 to advance, and a normal mounting detection sensor after a predetermined time. The detection signal from 89 is read.

  When the detection signal read by the control unit 100 is a normal mounting signal for detecting the proximity state of the pull stud 75b, and the operator is correctly mounting the tool holder 75 on the grip arm 38, the control unit 100 Thus, the alarm buzzer 101 is not sounded.

  However, when the detection signal read by the control unit 100 is a mounting failure signal for detecting the non-proximity state of the pull stud 75b, and the mounting state of the tool holder 75 to the grip arm 38 by the operator is defective. The alarm buzzer 101 sounds by the control unit 100.

  Thus, the operator can reliably recognize the mounting failure of the tool holder 75 by the buzzer sound. At the same time, at least the magazine motor 46 can be brought to an emergency stop, and damage to the grip arm 38 holding the tool holder 75 can be surely prevented.

[5] A mounting failure detection mechanism 80E obtained by partially changing the above-described mounting failure detection mechanism 80 is provided, and the posture is different between the state in which the tool holder 75 is correctly mounted and the state in which the tool holder 75 is defectively mounted. The rotation member 110 may be provided, and the rotation posture of the rotation member 110 may be detected by the normal mounting detection sensor 89 (see FIGS. 21 to 23).

  As shown in FIGS. 21 and 22, the rear cover 71 is arranged so that the replacement tool holder 75 can be easily attached to and detached from the grip arm 38 located at the tool attaching / detaching position that is the uppermost position of the rotary tool magazine 8. A substantially rectangular notch 71b is formed in the upper end portion corresponding to the tool attachment / detachment position. Therefore, the rotating member 110 is hinged to the lower end portion of the notch 71b at the lower end portion thereof so as to be able to appear and disappear in the notch 71b.

  The rotating member 110 is formed by bending a plate member so as to substantially follow the entire side surface of the tool holder 75, and a pair of left and right side plates 110b are integrally formed on the back plate 110a. When the tool holder 75 is attached to the grip arm 38, if the rotating member 110 is swung forward, the tool holder 75 is attached to the grip arm 38 correctly. Since the back plate 110a can abut on the whole and the side plate 110b simultaneously abuts on both the left and right sides of the tool holder 75, the rotating member 110 moves to the normal swing position shown by the solid line in FIG.

  However, when the mounting position of the tool holder 75 attached to the grip arm 38 is shifted in a direction parallel to the swinging direction of the grip arm 38, the entire rotating member 110 is properly connected via the back plate 110a. It does not rotate to the swing position. Further, even when the mounting position of the tool holder 75 attached to the grip arm 38 is shifted in a direction perpendicular to the swinging direction of the grip arm 38, the entire rotating member 110 is properly swung through the side plate 110b. It does not rotate to the moving position. Therefore, a normal mounting detection sensor 89 is provided that can detect the rotating member 110 when the rotating member 110 is rotated to the normal swing position.

  Next, the control system will be described. As shown in FIG. 23, a normal mounting detection sensor 89 and a mounting state confirmation switch 90 are connected to an input / output port of a control unit (C / U) 100 as a control device. In addition, an alarm buzzer 101 is connected.

Next, the operation of the mounting failure detection mechanism 80E configured as described above will be described.
The operator attaches the tool holder 75 to which the cutting tool 74 used in the next cutting operation is attached to the grip arm 38 positioned at the tool attaching / detaching position which is the uppermost position of the tool magazine 8 as described above. After the tool holder 75 is attached to the grip arm 38, when the operator operates the attachment state confirmation switch 90, the control unit 100 reads a detection signal from the normal attachment detection sensor 89.

  If the detection signal read by the control unit 100 is a normal mounting signal that detects the proximity state of the rotating member 110 and the operator has correctly installed the lip arm of the tool holder 75, the control unit With 100, the alarm buzzer 101 is not sounded.

  However, when the detection signal read by the control unit 100 is a defective mounting signal that detects the non-proximity state of the rotating member 110 and the mounting state of the tool holder 75 to the grip arm 38 by the operator is defective. The alarm buzzer 101 sounds by the control unit 100.

  Thus, the operator can reliably recognize the mounting failure of the tool holder 75 by the buzzer sound. At the same time, at least the magazine motor 46 can be brought to an emergency stop, and damage to the grip arm 38 holding the tool holder 75 can be surely prevented.

[6] A mounting failure detection mechanism 80F obtained by partially changing the mounting failure detection mechanism 80 described above is provided, and the holding position of the pair of left and right holding pins 60 when the grip holder 38 holds the tool holder 75 is determined. The first and second normal mounting detection sensors based on the strokes of the piston rods 103a and 104a are detected by detecting the advancing positions (strokes) of the piston rods 103 and 104 of a pair of first and second cylinders arranged orthogonally to each other. Based on the detection signal from 89, whether the tool holder 75 is attached or not may be determined (see FIGS. 24 to 26).

  That is, as shown in FIGS. 24 and 25, a pair of first and second cylinders 103 and 104 are formed at the upper end of the rear cover 71 at right angles to the pair of holding pins 60 provided on the grip arm 38, respectively. It is fixed via a mounting plate 111. However, the piston rods 103a and 104a (which correspond to the output rods) of the first and second cylinders 103 and 104 are respectively extended to the rear side.

  Therefore, small detection plates 112 for detecting the strokes (advance amounts) of the piston rods 103a and 104a are fixed to the rear end portions of the rear piston rods 103a and 104a, respectively. Further, when the tip portions of the piston rods 103a and 104a that have advanced are brought into contact with the tip portions of the pair of holding pins 60 in a state where the tool holder 75 is correctly mounted, a pair of detection plates 112 that can detect each detection plate 112. First and second normal wearing detection sensors 89A and 89B are provided.

  Here, when the tool holder 75 is correctly mounted, as described above, the key member 42 of the grip arm 38 is securely fitted in the key groove 75f of the tool holder 75, and the pair of grip arms 38 is paired. Since the holding pins 60 are respectively engaged with the V-grooves 75e, the advance amounts of the pair of holding pins 60 are both equal and maximum.

  At this time, since the strokes of the pair of piston rods 103a and 104a contacting the tip of the holding pin 60 are both maximized, the pair of first and second normal mounting detection sensors 89A and 89B correspond to the detection plates 112 corresponding thereto. Can be detected respectively.

  However, when the tool holder 75 is mounted defectively, that is, when the key member 42 of the grip arm 38 is not securely fitted in the key groove 75f of the tool holder 75, the mounting of the tool holder 75 to the grip arm 38 is performed. The position is unstable. In this case, the protruding amount of the pair of holding pins 60 is different, or even if the protruding amount of the pair of holding pins 60 is the same, the protruding amount is smaller than the protruding amount when correctly mounted. Yes.

  That is, in any of the cases described above, the stroke of the pair of piston rods 103a and 104a is not the same as the stroke when correctly mounted. Therefore, when the piston rods 103a and 104a are advanced, the pair of first and second normal mounting detection sensors 89A and 89B cannot simultaneously detect the corresponding detection plates 112.

  As described above, the stroke of the piston rods 103a and 104a until the tip end of the holding pin 60 comes into contact with the tool holder 75 correctly mounted, and the holding pin 60 with the tool holder 75 mounted in a defective state. Whether the tool holder 75 is attached or not can be determined from the difference between the strokes of the piston rods 103a and 104a until the tip comes into contact.

  Next, the control system will be described. As shown in FIG. 26, an input / output port of a control unit 100 (which corresponds to a determination unit, C / U) as a control device includes a first normal mounting detection sensor 89A and a second normal mounting detection sensor 89B. The mounting state check switch 90 is connected, and the alarm buzzer 101, the first cylinder 103, and the second cylinder 104 are connected to its output port.

Next, the operation of the mounting failure detection mechanism 80F configured as described above will be described.
The operator attaches the tool holder 75 to which the cutting tool 74 used in the next cutting operation is attached to the grip arm 38 positioned at the tool attaching / detaching position which is the uppermost position of the tool magazine 8 as described above. After the tool holder 75 is mounted on the grip arm 38, when the mounting state confirmation switch 90 is operated by the operator, the control unit 100 drives the pair of first and second cylinders 103 and 104 to advance simultaneously. Then, after a predetermined time, the detection signals from the first and second normal wearing detection sensors 89A and 89B are read.

  Therefore, the control unit 100 makes a determination based on the detection signals from the first and second normal mounting detection sensors 89A and 89B, and each detection signal is a normal mounting signal for detecting the detection plate 112, and is determined by the operator. When the mounting state of the tool tool 75 on the lip arm is correct, the alarm buzzer 101 is not sounded by the control unit 100.

  However, when at least one of the two detection signals read by the control unit 100 is an attachment failure signal that does not detect the detection plate 112, and the attachment state of the tool holder 75 to the grip arm 38 by the operator is bad. The alarm buzzer 101 sounds by the control unit 100.

  Thus, the operator can reliably recognize the mounting failure of the tool holder 75 by the buzzer sound. At the same time, at least the magazine motor 46 can be brought to an emergency stop, and damage to the grip arm 38 holding the tool holder 75 can be surely prevented.

[7] A mounting failure detection mechanism 80G obtained by partially changing the mounting failure detection mechanism 80 described above is provided, and a key member 42 is mounted on the distal end side arm portion of the grip arm 38 so as to be slidable in the length direction thereof. A block-shaped rubber member 115 that elastically biases the key member 42A provided on the arm 38 toward the tool holding portion 38A on the holding pin 60 side is provided, and the mounting failure of the tool holder 75 is detected via the key member 42A. You may make it do (refer FIGS. 27-29).

  As shown in FIGS. 27 and 28, the rear end of the key member 42A provided on the grip arm 38 is extended rearwardly through a through hole (not shown) formed in the grip arm 38. A bent forming portion 42a is formed at the rear end portion of the key member 42A, which is bent in the shape of a letter along the grip arm 38, so that the key member 42A does not come off toward the tool holding portion 38A. .

  A block-shaped rubber member 115 is attached to the lower surface of the key member 42A in FIG. However, the rear end of the rubber member 115 is brought into contact with a locking wall (not shown) immediately before the through hole of the grip arm 38. Therefore, the key member 42A is always urged in the distal direction (rightward in FIG. 28) by the elastic force of the rubber member 115, and can be engaged with the key groove 75f of the tool holder 75.

  By the way, as shown in FIG. 28, a red mark 116 coated with red paint is provided on the upper surface of the key member 42A opposite to the lower surface to which the rubber member 115 is adhered, and in the vicinity of the bend forming portion 42a. It has been. That is, when the tool holder 75 is correctly mounted, the key member 42A is in a predetermined normal position, and thus the red mark 116 of the key member 42A is hidden in the engagement hole of the grip arm 38. When the key member 42A is moved to the bent forming portion 42a side, the red mark 116 is exposed to the outside.

Next, the operation of the mounting failure detection mechanism 80G configured as described above will be described.
The operator attaches the tool holder 75 to which the cutting tool 74 used in the next cutting operation is attached to the grip arm 38 positioned at the tool attaching / detaching position which is the uppermost position of the tool magazine 8 as described above. At this time, as described above, when the key member 42A of the grip arm 38 is securely fitted in the key groove 75f of the tool holder 75, the key member 42A is at a predetermined normal position. As indicated by 29-1, the red mark 116 is not exposed to the outside.

  However, even when the key member 42A of the grip arm 38 is mounted so as not to be securely fitted into the key groove 75f of the tool holder 75, the tool holder 75 receives the spring force of the pair of holding pins 60 and receives the key member 42A. Since the key member 42A is pressed, the key member 42A moves to the bending portion 42a side, and the red mark 116 is exposed to the outside. By detecting the red mark 116, the worker can surely recognize the mounting failure of the tool holder 75 with his eyes.

[8] A tool insertion guide for guiding the tool holder 75 to be mounted correctly to the grip arm 38 positioned at the tool mounting / removal position for mounting / removing the tool among the plurality of grip arms 38 of the rotary type tool magazine 8 May be provided (see FIGS. 30 to 32).

  As shown in FIG. 30, the tool holder 75 is held on the magazine support 7 by the grip arm 38 while sliding with the key groove 75f held at a predetermined rotational phase with respect to the axis. A tool insertion guide 120 is erected. As shown in FIG. 31, the tool insertion guide 120 includes a guide main body 122 standing in a box shape on a mounting plate 121 at the lower end, and a pair of left and right inclined shapes formed on the guide main body 122. It includes a guide rail portion 122a, a pair of left and right V-groove guide rails 122b integrally formed in the vicinity of the lower end of the guide rail portion 122a, a slide member 123 having a key abutting portion 123a at the tip portion, and the like. .

  The guide rail portion 122a is provided in parallel with a space enough to fit the taper engaging portion 75a of the tool holder 75, and the pair of V-groove guide rails 122b are formed in the V-groove 75e of the tool holder 75 from opposite directions. It is bent so that it can be engaged simultaneously. However, a notch 122c for passage is provided at the lower end in the inclination direction of the guide rail portion 122a and the V-groove guide rail 122b so as not to prevent the turning movement of the tool holder 75 when the tool holder 75 is attached to the grip arm 38. Is formed.

  The slide member 123 is supported at the lower end portion thereof by the guide rail portion 122a so as to be slidable in the length direction, and at the tip end portion of the upper end portion, a forward projecting key that can be engaged with the key groove 75f of the tool holder 75 A contact portion 123a is provided.

Next, the operation and effect of the tool insertion guide 120 will be described.
When the operator mounts the tool holder 75 to which the cutting tool 74 used in the next cutting operation is attached to the grip arm 38 positioned at the tool attaching / detaching position which is the uppermost position of the tool magazine 8, the operator 75 hook-shaped portions 75c are placed on a pair of guide rail portions 122a and held with one hand, and the slide member 123 is moved to the tool holder 75 side with the other hand, and the key contact portion 123 a is engaged with the key groove 75 f of the tool holder 75.

  That is, since the pair of key grooves 75f of the tool holder 75 are formed at target positions every 180 °, the key groove 75f on the opposite side to the key groove 75f in contact with the key contact portion 123a is the grip arm 38. The phase is such that the key member 42 can be fitted. While maintaining this state, the operator can slide the tool holder 75 and the slide member 123 simultaneously along the guide rail portion 122a so that the operator can correctly attach the grip holder 38 without changing the phase of the tool holder 75. .

  Although not shown, the automatic tool changer 2A provided in the machine tool 1 is similar to the first embodiment in that a vertical column, a frame extending leftward from the column, and a Z-axis moving device A spindle head that can reciprocate in the axial direction, a pot-type tool magazine 8A that is arranged on a frame via a magazine support and can be indexed by rotation are provided.

  As shown in FIGS. 33 and 34, since the pot-type tool magazine 8A is a well-known one, its details will be omitted and will be described briefly.

  The pot-type tool magazine 8A includes a plurality of tool pots 125 (this corresponds to a tool holding portion), and each of the plurality of tool pots 125 is provided inside a magazine base 126 fixed to the machine tool main body side. The transfer mechanism 127 is attached. That is, the transfer mechanism 127 includes a pair of left and right sprockets 128 rotatably supported inside the magazine base 126, an endless chain 129 spanned between the two sprockets 128, and the chain 129. A bracket (not shown) fixed to the outer peripheral side, a magazine motor 46A for driving the chain 129, and the like are provided.

  The plurality of tool pots 125 are rotatably attached to the bracket, but the inner wall surface of the outer peripheral portion of the magazine base 126 contacts the tool pot 125 in the most range of the transfer path of the tool pot 125. Is in a state. Therefore, the inner wall surface is in a state of restricting the rotation of the tool pot 125, and the tool pot 125 is maintained in a state where the cutting tool 74 is directed to the front.

  On the other hand, an indexing hole 126a is provided on the lower end side of the magazine base 126, and the tool pot 125 directs the cutting tool 74 downward from a horizontal mounting posture only in the tool change position where the indexing hole 126a is provided. It can be switched to a vertical posture. Therefore, although not shown in the drawings, a tilting mechanism that rotates the tool pot 125 between a horizontally held state and a vertically changed state is provided at the tool change position.

  By driving the magazine motor 46A, the chain 129 is rotationally driven through the pair of sprockets 128, and the plurality of tool pots 125 are integrally transferred through the bracket. By the way, two sets of mounting failure detection members 131 and 132 that detect a mounting failure of the tool holder 75 to the tool pot 125 located at the tool attaching / detaching position among the plurality of tool pots 125 (this corresponds to mounting failure detecting means). Are provided opposite to each other in the moving direction of the tool pot 125.

  As shown in FIG. 33, an upper regulating member 131 is fixed to the right and left sides of the index opening 126a corresponding to the tool attaching / detaching position on the inner peripheral wall portion of the magazine base 126, and The lower regulating members 132 are fixed to the right and left sides of the index port 126a, which are the outer peripheral wall portions.

  As shown in FIG. 34, a downward trapezoidal contact restricting portion 131 a that protrudes downward is formed at the lower end portion of each upper restricting member 131, and protrudes upward at the upper end portion of each lower restricting member 132. An upward trapezoidal contact restricting portion 132a is formed.

  That is, when the tool holder 75 is correctly mounted on the tool pot 125 positioned at the indexing port 126a, when the plurality of tool pots 125 rotate counterclockwise, the hook-shaped portion 75c of the tool holder 75 is on the right side. When the plurality of tool pots 125 rotate clockwise, the hook-like portion 75c of the tool holder 75 can pass through the contact restriction portions 131a and 132a of the upper and lower restriction members 131 and 132 without contact. Can pass through the contact restriction portions 131a and 132a of the upper and lower restriction members 131 and 132 on the left side without contact.

Next, functions and effects of the mounting failure detection members 131 and 132 will be described.
The operator attaches the tool holder 75 to which the cutting tool 74 used in the next cutting operation is attached to the tool pot 125 located at the tool attaching / detaching position, which is the indexing opening 126a of the tool magazine 8A, and then performs control by the numerical control device. Cutting is started based on the program, and when the magazine motor 46A is driven when using the cutting tool 74 of the newly mounted tool holder 75, the magazine base 126 is rotated in a predetermined rotation direction.

  As described above, when the newly installed tool holder 75 is correctly attached to the tool pot 125 when the magazine base 126 is started in the predetermined rotation direction, the hook-like portion 75c of the tool holder 75 is The contact restricting portions 131a and 132a provided on the rotation direction side can pass through in a non-contact manner. In this case, the newly indexed tool holder 75 is moved to the lower delivery position of the spindle, and is securely attached to the tool attachment portion of the spindle head 6 by the downward movement of the spindle.

  However, since chips and the like adhere to the taper engaging portion 75a of the newly indexed tool holder 75, the tool holder 75 is defective in the tool pot 125 as shown by a two-dot chain line in FIG. When the tool holder 75 protrudes forward with respect to the tool pot 125, the contact restricting portions 131a and 132a provided with the hook-shaped portion 75c of the tool holder 75 on the rotation direction side are provided. Cannot pass through without contact. As a result, the rotation load of the magazine base 126 is increased, while the rotation torque of the magazine motor 46A is relatively small, so that the rotation of the transfer mechanism 127 is stopped. Therefore, the collision between the main shaft and the tool holder 75 can be easily and reliably prevented.

In this embodiment, the mounting failure detection means is provided at the tool mounting / removal position for tool mounting / removal, but the mounting failure detection means may be anywhere as long as it can be fixed.
In addition, those skilled in the art can implement the present invention in a form in which various modifications are added to the above-described embodiment, and the present invention includes such various modified forms.

1 is a side view of a machine tool having an automatic tool changer according to a first embodiment of the present invention. It is a principal part vertical side view of an automatic tool changer. It is a tool magazine principal part vertical section side view. It is D arrow line view of FIG. FIG. 4 is a view as viewed from an arrow E in FIG. 3. It is F arrow line view of FIG. It is a front view of a tool holder. It is a top view of the grip arm which attached the tool holder correctly. It is a top view of the grip arm which mounted | worn the tool holder badly. It is a side view of a tool magazine. It is a perspective view of a pair of notch formation board. FIG. 10 is a diagram corresponding to FIG. 9 according to a first modification. FIG. 11 is a diagram corresponding to FIG. 10 according to a first modification. It is a block diagram of a control system concerning the 1st change form. FIG. 10 is a diagram corresponding to FIG. 9 according to a second modification. It is a front view of a pair of notch formation board which concerns on a 2nd modification. FIG. 14 is a diagram corresponding to FIG. 13 according to a second modification. FIG. 10 is a diagram corresponding to FIG. 9 according to a third modification. FIG. 14 is a diagram corresponding to FIG. 13 according to a third modification. FIG. 10 is a diagram corresponding to FIG. 9 according to a fourth modification. FIG. 14 is a diagram corresponding to FIG. 13 according to a fourth modification. FIG. 10 is a diagram corresponding to FIG. 9 according to a fifth modification. It is a perspective view of a rotation member. FIG. 14 is a diagram corresponding to FIG. 13 according to a fifth modification. FIG. 10 is a diagram corresponding to FIG. 9 according to a sixth modification. FIG. 8 is a view corresponding to FIG. 8-1 having a pair of cylinders. FIG. 14 is a diagram corresponding to FIG. 13 according to a sixth modification. FIG. 10 is a diagram corresponding to FIG. 9 according to a seventh modification. It is a perspective view of the key member which stuck the rubber member. It is a figure which shows the state of a key member when a tool holder is correctly mounted | worn. It is a figure which shows the state of a key member when a tool holder is mounted | worn defectively. FIG. 10 is a diagram corresponding to FIG. 9 according to a seventh modification. It is a perspective view of a tool insertion guide. It is a side view of a tool insertion guide and a tool holder. It is a perspective view of the pot type magazine which concerns on 2nd Example. It is a principal part longitudinal section partial side view of FIG.

Explanation of symbols

2 Automatic tool changer 8 Rotating type tool magazine 8A Pot type tool magazine 22 Main shaft 38 Grip arm 42 Key member 42A Key member 60 Holding pin 74 Cutting tool 75 Tool holder 75a Taper engaging portion 75c Keyhole 75f Key groove 80 Mounting failure detection mechanism 80A to 80G Mounting failure detection mechanism 81 Notch formation plate 81A Notch formation plate 81B Notch formation plate 81b Notch portion 85 First contact 86 Second contact 87 First failure mounting detection switch 88 Second failure mounting Detection switch 89 Normal mounting detection sensor 89A First normal mounting detection sensor 89B Second normal mounting detection sensor 102 Switching cylinder 103 First cylinder 104 Second cylinder 110 Rotating member 112 Detection plate 101 Alarm buzzer 115 Rubber member 120 Tool insertion guide 123 Slide member 125 Tool pot 13 Regulating member 131a abutting regulating portion 132 regulating member 132a abutting regulating unit

Claims (14)

In an automatic tool changer having a rotary magazine in which a plurality of tool holders holding a tool holder to which a cutting tool is attached are arranged on the circumference,
An automatic tool changer comprising a mounting failure detection means for detecting a mounting failure of a tool holder to a tool holder.     2. The automatic tool changer according to claim 1, wherein the attachment failure detection unit is provided at a tool attaching / detaching position for attaching / detaching a tool among a plurality of tool holding portions of the rotary magazine. The mounting failure detection means includes a pair of notch forming plates disposed opposite to each other on both sides in the rotation direction of the tool holding portion at the tool attachment / detachment position,
The notch forming plate is configured such that the taper engaging portion of the tool holder correctly attached to the tool holding portion at the tool attachment / detachment position can pass in a non-contact manner and the tool holder taper badly attached to the tool holding portion. The automatic tool changer according to claim 2, wherein the engaging portion has a notch portion that cannot pass through in a non-contact manner.   The mounting failure detecting means includes a circuit interrupting portion that closes when a taper engaging portion of a tool holder that is poorly mounted on the tool holding portion contacts the notch forming plate, and the circuit interrupting portion is closed. The automatic tool changer according to claim 3, further comprising alarm means for electrically outputting an alarm when the alarm is issued.   The mounting failure detecting means can identify a taper engaging portion of a tool holder that is correctly mounted on a tool holding portion at the tool attaching / detaching position and a taper engaging portion of a tool holder that is mounted incorrectly on the tool holding portion. The automatic tool changer according to claim 2, further comprising a detection switch for detecting the position of the automatic tool changer.   6. The automatic tool changer according to claim 5, further comprising a switching actuator capable of switching the detection switch between a use position for the detection and a retreat position retracted from the use position. .   There is provided a rotating member that takes different postures between the state in which the tool holder is correctly mounted and the state in which the tool holder is mounted incorrectly, and the detection switch performs detection via the rotating member. 6. The automatic tool changer according to claim 5, wherein   The said attachment defect detection means has a defect attachment detection switch which detects that the notch formation board was pushed by the tool holder with which the said tool holding | maintenance part was mounted | worn defectively. Automatic tool changer. The mounting failure detection means includes
A pair of strokes that have output rods that can be brought into contact with the front ends of a pair of holding pins for holding the tool holder provided in the tool holding portion, respectively, from the orthogonal direction and that can detect the advance stroke of the output rod Detection means;
The stroke of the output rod until receiving the output of the pair of stroke detection means and coming into contact with the holding pin when the tool holder is correctly attached, and the holding pin when the tool holder is badly attached Discriminating means for discriminating whether or not the tool holder is mounted based on a difference from the stroke of the output rod until it comes into contact with
The automatic tool changer according to claim 1, further comprising: The tool holding portion is provided at the tip portion of the grip arm of the rotary magazine, the key member that engages the key groove of the tool holder held by the tool holding portion is provided in the grip arm, and the tip side arm of the grip arm The key member is attached to the portion so as to be slidable in the length direction, and an elastic member is provided to elastically bias the key member toward the tool holding portion,
2. The automatic tool changer according to claim 1, wherein the mounting failure detection means is configured to detect a mounting failure of the tool holder via the key member. In an automatic tool changer having a rotary magazine in which a plurality of tool holders holding a tool holder to which a cutting tool is attached are arranged on the circumference,
A tool insertion guide is provided for guiding a tool holder to be correctly attached to a tool holding part located at a tool attaching / detaching position for attaching / detaching a tool among a plurality of tool holding parts of the rotary magazine. Automatic tool changer to do. In an automatic tool changer having a pot type magazine in which a plurality of pots holding a tool holder to which a cutting tool is attached are arranged in a substantially oval shape when viewed from the front,
An automatic tool changer provided with a mounting failure detecting means for detecting a mounting failure of a tool holder in a pot. The mounting failure detection means includes two sets of restricting members disposed on opposite sides of the tool attachment / detachment position in the moving direction of the pot,
The restricting member allows the hook-like portion of the tool holder correctly attached to the pot at the tool attaching / detaching position to pass in a non-contact manner, and the hook-like portion of the tool holder not correctly attached to the tool holding portion to be non-contact The automatic tool changer according to claim 12, further comprising a contact restricting portion that cannot pass through.     14. The automatic tool changer according to claim 13, wherein the attachment failure detecting means is provided at a tool attaching / detaching position for attaching / detaching a tool among a plurality of pots of the pot type magazine.

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