JPH06633U - Automatic tool changer - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain an automatic tool changer capable of recovering a cutting tool supplied from a magazine and used again in the magazine. [Structure] The used drill holder 70 is extracted from the cutting device 20 by the tool transfer device 208 and moved to the recovery position. After indexing the magazine 130, the slider 162
Is moved forward to push the new drill holder 70 into the spindle hole of the cutting device 20 by the pushing rod 172 and hold it in the cutting device 20. After the used drill holder 70 is gripped by the retracting rod 170, the slider 162 is retracted, and the used drill holder 70 is collected in the empty holding sleeve 144 in the collecting position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic tool changer, and more particularly, to an apparatus that can collect a cutting tool, which has been supplied from a magazine and used, into a magazine again.

[0002]

[Prior art]

 There are two types of automatic tool changers, one is that the cutting tool is attached to the spindle of the machine tool from the tip side of the spindle, and the other is that the cutting tool is pushed out to the tip of the spindle from the rear part of the spindle hole.

In an automatic tool changer in which a cutting tool is attached from the tip side of a spindle, a used cutting tool stored in a magazine is removed after the used cutting tool attached to the spindle is removed. It is attached to the main shaft by approaching the tip of the main shaft from the front of the. The used cutting tools are returned to the magazine.

On the other hand, in an automatic tool changing device for attaching a cutting device from the rear end side of the spindle, for example, the device described in Japanese Patent Publication No. 62-166936, the cutting tool stored in the magazine before use is , It is extruded from the rear part of the spindle hole to the tip of the spindle and is replaced with the used cutting tool attached to the spindle. This device can be used for cases where it is not possible to place a magazine in front of the cutting device, such as when another processing device is installed in front of the cutting device or when the installation space is small. The automatic replacement of cutting tools can be easily performed.

[0005]

[Problems to be solved by the device]

 However, in the above device, when exchanging the cutting tool, the used cutting tool attached to the spindle is pushed out of the spindle hole by the cutting tool before use, and the saucer placed below the spindle is replaced. I was able to receive it. Therefore, there was a problem that the saucer had to be taken in and out every time the tool was replaced in order to prevent chips and cutting oil generated during cutting from entering the saucer.

In view of this problem, an object of the present invention is to obtain an automatic tool changing device of a type in which a cutting tool before use is attached from the rear side of a spindle, and which does not drop a used tool on a tray. It was done.

[0007]

[Means for Solving the Problems]

 And, the gist of the present invention is an automatic tool changer that pushes a cutting tool stored in a magazine before use from the rear part of a spindle hole to the tip of the spindle and replaces it with a used cutting tool attached to the spindle. In the above, a tool recovery device was installed to collect used tools again in the magazine.

[0008]

[Action]

 In the automatic tool changer configured as described above, when the tool is changed, the used cutting tool attached to the spindle is returned to the magazine again by the tool recovery device. Therefore, when the cutting tool before use is attached to the spindle, the used tool is prevented from being pushed out of the spindle and falling.

[0009]

[Effect of device]

 According to the tool changer of the present invention, since the used cutting tools are collected again in the magazine, it is not necessary to provide a separate tray for receiving the cutting tools, and to insert and remove it every time the tools are replaced. The space around the tip of the can be used more effectively for other devices.

[0010]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings. In FIGS. 1 and 2, 10 is a base. On the base 10, three support plates 12, 14 and 16 extending in the vertical direction are erected at intervals in the longitudinal direction of the base 10.

A cutting device 20 is mounted on the base 10. As shown enlarged in FIGS. 6 and 7, through holes 22 and 24 are formed in the support plates 12 and 14, respectively, and the cutting device 20 penetrates these through holes 22 and 24, and the base plate It is arranged along the longitudinal direction of 10. As shown in FIG. 9, the housing 26 of the cutting device 20 is immovably fixed to the base 10 by bolts 28 and the like.

In FIG. 9, a cylindrical sleeve 32 is fitted in the axial hole 30 of the housing 26, and is integrally fixed to the housing 26 by a bolt at a flange portion 34. A main shaft 46 is rotatably fitted in the sleeve 32 via four bearings 36, and a rear end portion of the main shaft 46 projects from the sleeve 32 and the housing 26. A stepped spindle hole 50 extending in the axial direction is formed in the spindle 46, and a hollow rod 52 is inserted from the rear end portion.

A cover 54 is fixed to the front end face of the main shaft 46, and a labyrinth seal 57 is formed between the cover 54 and another cover 56 fixed to the front end face of the sleeve 32. Intrusion of dust between the main shaft 46 and the sleeve 32 is prevented.

A collet 58 is inserted from the tip side of the spindle hole 50. The collet 58 has a substantially cylindrical shape, and is screwed into the female screw hole 62 at the front end of the hollow rod 52 at the male screw portion 60 formed at the rear end thereof, so that the collet 58 is integrated with the hollow rod 52. It is possible to move in the axial direction. An outer peripheral taper surface is formed at the tip of the collet 58, and is fitted to the inner peripheral surface of a tapered hole 64 formed at the front end of the axial hole 50 of the main shaft 46. Further, an engagement protrusion 66 is formed on the inner peripheral side of the front end of the collet 58. The relative rotation between the collet 58 and the main shaft 46 is blocked by the key 68.

A drill holder 70, which is a tool holder, is inserted through the collet 58. An engagement recess 74 into which the engagement projection 66 of the collet 58 can be fitted is formed on the outer peripheral surface of the holder body 72 of the drill holder 70. A torque transmission member 76 is fitted in the holder body 72 so as to be slidable in the axial direction. A pin 78 is provided upright on the torque transmission member 76, and the pin 78 is engaged with an elongated hole 80 formed in the holder main body 72, whereby the relative rotation between the drill holder 70 and the torque transmission member 76. Are prevented. The axial position of the torque transmission member 76 is determined by the screw member 82 screwed into the female screw hole 81 of the drill holder 70. A loosening prevention member (not shown) is provided between the screw member 82 and the threaded portion of the female screw hole 81 to prevent the screw member 82 from easily moving in the axial direction. Further, the retreat limit of the screw member 82 is determined by the retaining ring 84 fitted on the inner peripheral surface of the female screw hole 81.

A pull stud 86 is screwed into the female screw hole 81 of the holder body 72. The pull stud 86 is always attached to the holder main body 72 with a constant insertion depth by bringing the tip end thereof into contact with the retaining ring 84. Further, a tool engaging portion 88 is formed at the tip end portion of the torque transmitting member 76, and the torque is transmitted by engaging the fitting projection of the drill 90 as a cutting tool. A collet chuck 92 is provided at a front end portion of the holder main body 72 that extends through the cover 54, and the collet chuck 92 is tightened with the drill 90 engaged with the torque transmission member 76. As a result, the drill 90 is held by the drill holder 70 such that the drill 90 cannot move and rotate in the axial direction.

On the other hand, a pulley 96 is attached to the rear end of the main shaft 46 by a fixing device 98 so as not to rotate relative to each other. A V-belt 106 is provided between the pulley 96 and a pulley 104 held by a rotary shaft 102 of a servo motor 100 (see FIGS. 1 and 6) mounted on the support plate 12 of the base 10 so as not to rotate relative to each other. The rotation of the servo motor 100 is transmitted to the main shaft 46.

A sleeve 110 is fixed to the hollow rod 52 extending from the rear end of the main shaft 46. A piston is attached to the sleeve 110 via a bearing (not shown) so as to be relatively rotatable and relatively immovable in the axial direction. This piston is fitted in a housing 114 of a cylinder 112 shown in FIG. 8 so as to be liquid-tight and slidable, and divides the inside of the housing 114 into two hydraulic chambers. A cover 116 is fixed to the rear end of the main shaft 46, and is coupled to another cover 118 that is fitted in the housing 114 so as to be rotatable relative thereto. Therefore, as the main shaft 46 rotates, the covers 116 and 118 rotate together with the main shaft 46, but the piston of the cylinder 112 and the housing 114 do not rotate.

When the sleeve 110 and the hollow rod 52 are retracted by the operation of the cylinder 112, the collet 58 is drawn into the axial hole 50 and its diameter is reduced by the tapered hole portion 64 of the main shaft 46. As a result, the engagement projection 66 engages with the engagement recess 74 of the drill holder 70, and the drill holder 70 is fixed to the main shaft 46 so that it cannot move and rotate relative to the main shaft 46. 70, the torque is transmitted to the drill 90 via the torque transmission member 76, and the drill 90 is rotated to perform cutting.

As shown in FIG. 1, on the base 10, a small support plate 122 is provided upright between the support plates 14 and 16. Arms 124 and 126 are extended from plate surfaces of the support plates 14 and 122 facing each other, and the magazine 130 is supported from below by the arms 124 and 126.

As shown enlarged in FIGS. 3 and 5, the magazine 130 includes a pair of discs 132 and 134. Both discs 132 and 134 are connected by a connecting shaft 140 via mounting members 136 and 138 so that they cannot move relative to each other. Twelve holding holes 142 are formed at equal angular intervals along the outer circumference of each of the discs 132 and 134, and the respective holding holes 142 are fitted with the ends of twelve holding sleeves 144, respectively. As a result, the holding sleeve 144 is held by both discs 132 and 134. A drill holder 70 holding a new drill 90 before use is held in each of the 11 holding sleeves 144 of the 12 holding sleeves 144 except a specific one. . The state is conceptually shown in FIG. In the figure, ∘ indicates the sleeve 144 holding the drill holder 70, and ∘ indicates the empty sleeve 144. It should be noted that FIGS. 3 and 4 show the drill holder 70 in one holding sleeve 144 as a representative.

A rotary shaft 146 is rotatably held by the support plate 122 via a bearing. The rotating shaft 146 is hollow, and a support shaft 147 is fitted inside thereof so as to be relatively movable in the axial direction and not relatively rotatable, and a grip 148 is attached to its rear end. The tip portion of the support shaft 147 is a fitting portion that can be fitted into the fitting hole of the mounting member 138 only in one relative phase. The support shaft 147 is urged in the forward direction by the urging force of a spring member (not shown), but if the worker grips the grip 148 and pulls it, the support shaft 147 moves backward, and the fitting portion disengages from the mounting member 138. The magazine 130 can be removed. Although not shown, the arm 124 is provided with a center coaxial with the support shaft 147. When the magazine 130 is supported by the center and the support shaft 147, the mounting members 136 and 138 are provided. It is adapted to be slightly lifted from the arms 124 and 126.

A toothed pulley 150 is attached to the rotary shaft 146 so as not to rotate relative to it, while a servo motor 152 for magazine indexing is attached to the holding plate 120. The servo motor 152 includes an encoder 153. There is. Since the toothed belt 158 is wound around the toothed pulley 156, which is attached to the output shaft 154 of the servo motor 152 so as not to rotate relative to it, and the toothed pulley 150, the rotation shaft is rotated by the servo motor 152. The magazine 130 is rotated through a fixed angle via the 146 and the support shaft 147.

As shown in FIGS. 1 and 5, between the support plates 14 and 16, a pair of guide rods 160 are arranged at positions vertically separated from each other, and the upper and lower corners of the U-shaped slider 162 are arranged vertically. A sliding portion 164 provided on the portion is slidably fitted to both guide rods 160. The slider 162 has an upper wall 165 and a bottom wall 166 extending parallel to the base 10. An arm 167 extends from the tip of the top wall 165 and an arm 168 extends from the tip of the bottom wall 166. Has been. A pull-in rod 170 is fixed to the arm 167, and a push-out rod 172 is fixed to the arm 168. The rods 170 and 172 extend in parallel to the longitudinal direction of the base 10, and have an outer diameter of a size that can be fitted into each holding sleeve 144 of the magazine 130.

A gripping tool 174 as shown in FIG. 4 is attached to the tip of the retractable rod 170. The gripping tool 174 grips the pull stud 86 of the drill holder 70 by the biasing force of the spring 177 arranged between the pair of gripping claws 176. Further, an axial hole 178 as shown in FIG. 9 is formed at the tip of the push rod 172, and the pull stud 86 is accommodated so that the tip surface abuts on the rear end surface of the drill holder 70. Is pushed into the spindle hole 50 of the cutting device 20.

Further, on the base 10, a rodless cylinder 180 is fixed in parallel with the guide rod 160 between the support plates 14 and 16, and its piston is connected to the slider 162 by the connecting member 182. ing. Therefore, the operation of the rodless cylinder 180 causes the slider 162 to move while being guided by the guide rods 160, so that the rods 170 and 172 move in and out of the holding sleeves 144 of the magazine 130. As shown in FIG. 5, grooves 184 communicating with the respective holding holes 142 are formed at 12 locations on the outer peripheral portions of both discs 132, 134 of the magazine 130, and the grooves 184 are formed in each holding sleeve 144. A groove 185 communicating with is formed along the longitudinal direction. These grooves 184, 185 are sized to allow the arms 167, 168 of the slider 162 to pass through, and the slider 162 passes through the grooves 184, 185 even when the magazine 130 is in any indexing phase. It is allowed to move in the longitudinal direction of the base 10. The width of the groove 185 of the holding sleeve 144 is smaller than the diameter of the drill holder 70.

As shown in FIGS. 3 and 5, a spreading member 186 is attached to the upper end of the support plate 122. When the retracting rod 170 is retracted to the vicinity of the retracted end, the gripping tool 174 is fitted into the expanding member 186, and both gripping claws 176 are expanded against the biasing force of the spring 177, so that the gripping tool 174 is expanded. The gripped drill holder 70 is released and left inside the holding sleeve 144. When the drill holder 70 is gripped by the gripper 174, the pull studs 86 expand the gripping claws 176 to hold the drill holder 70.

As shown in FIG. 1, below the magazine 130, the base 10 is provided with stoppers 188 and 190. The stopper 188 has a stopper surface 189 capable of contacting the front end surface of the base portion 191 of the arm 168 of the slider 162 shown in FIG. 5, and is fixed to the base 10 near the front end portion of the rodless cylinder 180. There is. On the other hand, the stopper 190 has a bell crank shape as shown in FIG. 6, and is supported by a support base 192 so as to be rotatable around a support pin 194, as shown in FIG. On the side of the stopper 190 facing the stopper 188, a stopper surface 196 is formed which can come into contact with the rear end surface of the base 191 of the arm 168. A piston rod 202 of the air cylinder 200 is rotatably connected to the stopper 190 via a connecting member 198. The air cylinder 200 is rotatably attached to the base 10.

Therefore, when the air cylinder 200 operates and the piston rod 202 is extended, the stopper 190 rotates around the support pin 194, and the stopper 190 is moved as shown by the chain double-dashed line in FIG. Although it is retracted to a position outside the movement path of the slider 162, the slider 62 advances to the forward end position shown by the chain double-dashed line in FIG. 3, and the front end surface of the base 191 of the arm 168 contacts the stopper surface 189 of the stopper 188. In the contact state, the piston rod 202 is contracted, so that the stopper surface 196 of the stopper 190 comes very close to the rear end surface of the base 191.

As shown in FIG. 1, a sleeve 204 is disposed between the support plate 12 and the support plate 14, and a sleeve 206 extends from the end surface of the support plate 12 opposite to the support plate 14. Has been. The sleeves 204 and 206 have the same diameter as the holding sleeve 144 of the magazine 130, and the sleeves 204 and 206 and the retracting rod 170 are coaxial. Therefore, if the magazine 130 is indexed and one of the holding sleeves 144 is positioned at a position coaxial with the sleeves 204 and 206 (hereinafter referred to as a recovery position), the slider 162 is moved. The retracting rod 170 penetrates the holding sleeve 144 and fits into the sleeve 206 from the sleeve 204.

On the other hand, since the magazine 130 is indexed, the holding sleeve 144 at the collecting position is located at a fifth position counterclockwise in FIG. 5 and FIG. 10, that is, at a position separated by 150 degrees. The sleeve 144 is positioned at a position coaxial with the hollow rod 52 of the cutting device 20 (hereinafter, referred to as a mounting position). Therefore, as the slider 162 moves forward, the pushing rod 172 is fitted into the hollow rod 52 of the cutting device 20.

A tool transfer device 208 is provided on the end surface of the support plate 12 opposite to the support plate 14. The tool transfer device 208 includes a cylinder 210. The cylinder 210 is fixed to the support plate 12, and the tip end portion of the piston rod is connected to the mounting plate 214 as shown in FIGS. 1 and 2. A pair of guide bushes 216 are fixed to the support plate 12 slightly below the cylinder 210, and fixed guide rods 218 are axially slidably fitted to both ends of the mounting plate 214. By doing so, the movement of the mounting plate 214 is guided.

A rotary air cylinder 224 is attached to the attachment plate 214, and a rotating arm 226 is fixed to the rotation shaft of the rotary air cylinder 224. The rotation limit of the rotation arm 226 is defined by a stopper 228 (see FIG. 7) fixed to the mounting plate 214.

A holder gripper 232 is provided at the tip of the rotating arm 226. The holder gripper 232 is located on the axis of the spindle 46 when the rotating arm 226 is in the operating position shown by the solid line in FIG. 7, and on the axis of the sleeve 206 when it is in the original position shown by the chain double-dashed line. To be made. The holder gripping tool 232 has a pair of gripping claws 234, and both gripping claws 234 are opened and closed by the operation of the air cylinder 236 fixed to the rotating arm 226, thereby gripping and releasing the drill holder 70.

In the automatic tool changer configured as described above, a case where a new drill 90 housed in the magazine 130 is attached to the spindle 46 of the cutting device 20 will be described.

First, a drill holder 70 holding a new drill 90 (hereinafter referred to as a new drill holder 70) is housed in 11 of the 12 holding sleeves 144 of the magazine 130. Then, with the operator pulling the grip 148 and retracting the support shaft 147, the magazine 130 is placed on both arms 124 and 126. By releasing the grip 148 and rotating the magazine 130, when the magazine 130 and the support shaft 147 are in phase with each other, the support shaft 147 fits into the mounting member 138, and the magazine 130 has a specific phase with respect to the support shaft 147. Will be supported by. After that, when the operator presses the start button, the servo motor 152 is started to rotate the magazine 130, and as shown in FIG. 10, the specific holding sleeve 144 that holds nothing inside is in the collection position. When it is positioned at, the servo motor 152 is stopped based on the signal of the encoder 153.

In the cutting device 20, the hollow rod 52 and the collet 58 are advanced by the operation of the cylinder 112 so that the drill holder 70 can be mounted.

Next, the rodless cylinder 180 is operated, the slider 162 is advanced while being guided by the guide rod 160, and the retracting rod 170 enters the holding sleeve 144 in the recovery position, while the pushing rod 172 is in the mounting position. Of the drill holder 70, the pull stud 86 of the drill holder 70 is fitted into the axial hole 178 of the extruding rod 172, and the tip end surface of the extruding rod 172 abuts on the rear end surface of the drill holder 70. Push to the cutting device 20 side.

When a sensor (not shown) detects that the slider 162 is moved to the forward end position and abuts on the stopper 188, the air cylinder 200 causes the stopper 190 to position the slider 162 from the retracted position. The slider 162 is rotated to the position to prevent the slider 162 from retracting. In this way, with the slider 162 positioned at the forward end position, in the cutting device 20, the collet 58 is retracted by the cylinder 112, and the new drill holder 70 is fixed to the spindle 46. At this time, the drill holder 70 tends to retract together with the collet 58, and a force in the retracting direction is applied to the slider 162 via the pushing rod 172, but these retracting are prevented by the stopper 190 and the spindle of the drill holder 70 is prevented. The axial position with respect to 46 is precisely determined.

After the mounting of the drill holder 70 is completed, the stopper 190 is rotated to the retracted position by the air cylinder 200 to allow the slider 162 to retract. Then, the slider 162 is retracted by the operation of the rodless cylinder 180, and the retracting rod 170 is extracted from the sleeves 206 and 204, and the extruding rod 172 is extracted from the sleeve 52.

When the drill holder 70 is first attached to the cutting device 20, the empty holding sleeve 144 is positioned at a position corresponding to the retracting rod 170, so that the retracting rod 170 does not hold anything. Then, the slider 162 is fitted into the sleeve 206, and the slider 162 is retracted to be pulled back into the holding sleeve 144 as it is. When the sensor (not shown) detects that the slider 162 has returned to the original position at the left end, the operation of the rodless cylinder 180 is stopped, and a series of operations is completed.

Next, a case will be described in which the used drill 90 is replaced with a drill that has not been used after being cut by the cutting device 20. First, the servo motor 152 is activated and the magazine 130 is rotated clockwise by 150 degrees. As a result, of the 12 holding sleeves 144, the drill holder 70 is first pushed out and the empty holding sleeve 144 is positioned at the recovery position corresponding to the retracting rod 170, and the holding sleeve 144 moves counterclockwise from the holding sleeve 144. The holding sleeve 144, which is 150 degrees apart, is positioned in the mounting position corresponding to the push rod 172.

On the other hand, with the rotating arm 226 of the tool transfer device 208 positioned in the working position, the air cylinder 236 is operated and the drill holder 70 is gripped by the holder gripper 232. Thereafter, in the cutting device 20, the hollow rod 52 and the collet 58 are advanced by the operation of the cylinder 112, and the drill holder 70 holding the used drill 90 held by the main shaft 46 (hereinafter, used drill Grip holder 70) is released.

Next, the mounting plate 214 is advanced by the cylinder 210, and the drill holder 70 gripped by the rotating arm 226 is extracted from the spindle hole 50. Then, the rotary air cylinder 224 is operated to rotate the rotary arm 226 until it abuts on the stopper 228, so that the used drill holder 70 that has been extracted can be inserted into the sleeve 206.

In parallel with the above operation, the slider 162 is advanced in the same manner as described above, the rods 170 and 172 are inserted into the holding sleeves 144, and the new drill holder 70 is pushed into the spindle hole 50. Also at this time, since the holding sleeve 144 into which the retracting rod 170 is inserted is empty, the retracting rod 170 is advanced without gripping anything.

After the slider 162 is positioned at the forward end position and the retracting is prevented by the stopper 190, the collet 58 is retracted by the cylinder 112 and the new drill holder 70 is fixed to the spindle 46 of the cutting device 20. .

On the other hand, in the tool transfer device 208, the air cylinder 236 is operated and the used drill holder 70 held by the holder holding tool 232 is inserted into the sleeve 206. At this time, since the retracting rod 170 has reached the forward end position, the pull stud 86 is sandwiched between the two gripping claws 176 of the gripping tool 174 at the end of the insertion of the drill holder 70 into the sleeve 206. Subsequently, the grip of the drill holder 70 by the holder gripping tool 232 is released, and the rods 170 and 172 are retracted together with the slider 162, so that the used drill holder 70 is drawn into the magazine 130. Then, when the gripping tool 174 of the retracting rod 170 is positioned inside the expanding member 186, both gripping claws 176 are expanded against the biasing force of the spring 177, and the used drill holder that has been gripped is used. Release 70 into retention sleeve 144 in the retrieval position. Therefore, the used drill holder 70 is collected in the empty holding sleeve 144 of the magazine 130.

In this embodiment, the slider 162, the retracting rod 170, the pushing rod 172, the gripping tool 174, the rodless cylinder 180, the sleeves 204 and 206, the tool transporting device 208, and the like constitute a tool collecting device. is there.

In this embodiment, the magazine 130 is provided with 12 holding sleeves 144, and 11 of them holds the new drill holder 70, so that the drill 90 is replaced in the same manner. By rotating the magazine 130 clockwise by 150 degrees each time, a new drill holder 70 is sequentially attached to the spindle 46 from the holding sleeve 144 numbered 1, 2, 3, ..., 11 in FIG. It is attached and collected in the original holding sleeve 144 after use. When the eleventh drill holder 70 has been used and the last drill holder 70 is recovered, the 11th holding sleeve 144 that has been emptied by removing the drill holder 70 is in the recovery position. As it is rotated, the particular retaining sleeve 144, which was initially empty, is rotated to the mounting position. Therefore, even if both rods 170 and 172 are moved forward together with the slider 162, nothing is supplied to the cutting device 20, and only the used drill holder 70 is recovered by the retracting rod 170.

As described above, in this embodiment, the tool can be automatically changed 11 times by attaching the magazine 130 once. After 11 times of replacement, the used drill holders 70 have been collected in all 11 holding sleeves 144 of the magazine 130, so the magazine 130 is removed and the new drill holder 70 is replaced. The operation can be easily resumed by attaching another held magazine 130.

In the embodiment described above in detail, the new drill holder 70 was held by the eleven holding sleeves 144 of the magazine 130, but if the device is changed a little, it will be twelve. The new drill holder 70 can be held by all of the holding sleeves 144, and sequentially replaced. The push rod 172 is also provided with a gripping tool 174 similar to the retractable rod 170, and an expanding member 186 for releasing the drill holder 70 gripped by the push rod 172 into the holding sleeve 144. .

In the device of this configuration, when the new drill 90 is first attached to the spindle 46 of the cutting device 20, the retracting rod 170 moves to the holding sleeve 144 in the collecting position as the slider 162 moves forward. While pushing in and gripping the pull stud 86 of the new drill holder 70, the push rod 172 enters the holding sleeve 144 at the mounting position and pushes the cutting tool 20 side while gripping the new drill holder 70.

The retracting rod 170 grips the new drill holder 70 and fits into the sleeve 206 via the sleeve 204, but is retracted into the holding sleeve 144 while gripping the drill holder 70 by retracting the slider 162. When the grasping tool 174 of the retracting rod 170 is positioned inside the expanding member 186, both grasping claws 176 are expanded against the biasing force of the spring 177, and the new drill holder 70 that has been grasped is recovered. Release into the holding sleeve 144.

Similar to the above-described embodiment, each time the drill 90 is replaced, the magazine 130 is rotated clockwise by 150 degrees, and another new drill holder 70 is sequentially attached to the spindle 46. After use, It is collected in the original holding sleeve 144. When the twelfth drill holder 70 is collected, the pushing rod 172 again holds the used drill holder 70 collected by the holding sleeve 144 and advances it. Not actuated, the used drill holder 70 is not attached to the spindle 46. Therefore, as the slider 162 retracts, the push rod 172 is retracted while retaining the used drill holder 70, releasing it into the retaining sleeve 144.

As described above, in the present embodiment, since the tool can be automatically changed 12 times by attaching the magazine 130 once, the working efficiency can be further improved. Further, it is not necessary to empty the specific holding sleeve 144 in advance, and the servo motor 152 rotates the magazine 130 so that the arbitrary two holding sleeves 144 are located at the collecting position and the mounting position, respectively. Well, the mounting of the magazine 130 becomes easy, and the occurrence of operational mistakes is avoided.

Although the drill 90 is replaced by the magazine 130 in the above-described two embodiments, another cutting tool can be replaced. It is also possible to hold the tool holders of the same shape holding different types of tools in the magazine 130, and to cause the cutting device 20 to sequentially hold different tools.

In addition, the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art, such as appropriately changing the configuration of the tool recovery device.

[Brief description of drawings]

FIG. 1 is a front view showing an entire automatic tool changer according to an embodiment of the present invention.

FIG. 2 is a plan view of the device.

FIG. 3 is a front view (partially sectional view) showing an enlarged main part of the apparatus.

FIG. 4 is an enlarged plan view (partially sectional view) of a main part of the apparatus.

5 is an enlarged VV sectional view of FIG.

6 is an enlarged VI-VI sectional view of FIG.

FIG. 7 is an enlarged left side view of FIG.

FIG. 8 is an enlarged front view showing a cutting device attached to the above device.

9 is a front cross-sectional view showing an enlarged main part of the cutting device of FIG. 8. FIG.

FIG. 10 is a view for explaining the supply of tools from the magazine of the above device to the cutting device.

[Explanation of symbols]

 70 Drill Holder 90 Drill 130 Magazine 144 Holding Sleeve 152 Servo Motor 162 Slider 170 Pulling Rod 172 Extruding Rod 204 Sleeve 206 Sleeve 208 Tool Transfer Device

Front page continued (72) Kozo Ohashi 26 Hirako Yoshiwara-cho, Toyota-shi, Aichi Fuji Seiko Co., Ltd. (72) Inventor Masahiro Ishikawa 1 Toyota-cho, Toyota-shi, Aichi (72) Devised Author Hirohito Yoshimura 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor: Tahiro Takasaki 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An automatic tool exchanging device for extruding a cutting tool stored in a magazine before use from a rear portion of a spindle hole to a tip of a spindle and replacing the used cutting tool attached to the spindle with a used tool. An automatic tool changer comprising a tool recovery device for recovering the tool in the magazine again.