JP2008110447A - Workpiece discharge device and machine tool provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece discharge device provided with a guide means for preventing jumping of a product by shock of cutting-off. <P>SOLUTION: This workpiece discharge device is arranged on a spindle distal end side of a machining machine for machining a workpiece W integrally rotated by being attachably/detachably fixed at a distal end of a rotated and driven spindle S by a machining tool. The device is integrally provided with the guide means to hold and guide the distal end side of the workpiece W when performing the cutting-off work of the workpiece W in which machining of a prescribed machining part projecting from the spindle S is completed. The guide means is constituted to perform the guide by proximity moving to approach toward the spindle S of a holding means 26. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a work discharging apparatus that discharges a work released from the main spindle of a processing machine from the main spindle and a machine tool including the work discharging apparatus.

A gripping means for gripping a protruding portion of the workpiece from the spindle, which is disposed on the spindle tip side of a processing machine for processing a workpiece that is detachably fixed to the tip of a spindle that is conventionally driven to rotate by a processing tool, An advancing / retreating means for moving the gripping means back and forth with respect to the main shaft, and the gripping means retracts and moves in a direction away from the main shaft in a gripping state of the work, thereby removing the workpiece released from the main shaft A workpiece discharge device that discharges from a workpiece is known (see, for example, Patent Document 1).
Japanese Patent Publication No. 08-18162

  When the predetermined machining portion protruding from the workpiece spindle is finished, the processing machine performs a parting work of the work with a parting tool or the like, and separates the processed product from the work. However, since the tip of the workpiece (product) is free during the parting operation, there is a drawback that the product may not be able to be collected by the parting impact.

  In order to solve the above-described problems, the workpiece discharge device of the present invention is disposed on the tip end side of a spindle of a processing machine that processes a workpiece W that is detachably fixed to the tip end of a spindle S that is rotationally driven and rotates integrally with a processing tool. A gripping means 26 for gripping the protruding portion of the workpiece W from the spindle S and an advancing / retreating movement means 14 for moving the gripping means forward and backward with respect to the spindle S are provided. The gripping means 26 is in a gripping state of the workpiece W. In a workpiece discharge device that discharges the workpiece W released from the spindle S from the spindle S by retreating in a direction away from the spindle S, the workpiece for which a predetermined machining portion protruding from the spindle S has been processed is completed. Guide means for holding and guiding the leading end side of the workpiece W during the cut-off operation of W is provided, and the guide means performs the above-described guide by proximity movement toward the spindle S. Are the first, characterized in that integrally attached to Uni gripping means 26 side.

  Secondly, the guide means is constituted by a hollow pipe 29, and the workpiece is guided by inserting the distal end side of the workpiece W into the hollow pipe 29.

  Thirdly, the hollow pipe 29 constituting the guide means is provided so as to be switchable between a guide attitude Y protruding from the gripping means toward the main shaft S side and an accommodation attitude X accommodated on the gripping means side. .

  Fourthly, the gripping means 26 is composed of a pair of opposing chuck claws 23a and 23b, and the workpiece W is gripped and released by opening and closing the chuck claws 23a and 23b.

  Fifthly, there is provided a discharge switching means 10 for discharging the discharged workpiece W 'and the product separated from the workpiece W by the cut-off operation, to different positions.

  Further, the present invention is characterized in that the machine tool is integrally provided with a work discharging device characterized by at least one of the first to fifth features.

  According to the structure of the workpiece discharging apparatus of the present invention configured as described above, the guide means holds and guides the leading end side of the workpiece when the workpiece is cut off, so that the product separated from the workpiece by the cutting off is bounced off when the workpiece is cut off. Flying is prevented and the product collection efficiency can be improved.

  Since the guide means is integrally provided on the gripping means side, it is not necessary to provide guide means separately from the work discharging device. In particular, the guide means is used as the main shaft by the advancing / retracting means for moving the gripping means forward / backward with respect to the main shaft. On the other hand, it is possible to move forward and backward, and there is an advantage that the guide means can be provided easily and at low cost.

  In particular, the guide means is constituted by a hollow pipe, and the guide means can be easily configured by guiding the work by inserting the tip end side of the work into the pipe. The means can be easily incorporated.

  The guide means (hollow pipe) is provided so that the posture can be switched between a guide posture protruding from the gripping means toward the main shaft side and an accommodation posture accommodated on the gripping means side, so that the guide means is set to the guide posture only during the cut-off operation. Since the holding posture can be set when the workpiece is discharged by the gripping means, the workpiece can be guided during the cut-off work without hindering the gripping work of the work by the gripping means.

  In particular, the gripping means is composed of a pair of chuck claws facing each other, and the chuck claw is opened and closed so that the workpiece can be gripped and released. The hollow pipe in the guide posture can be easily projected from between the gaps, and the gripping means provided with the guide means can be configured easily.

  In addition, by providing discharge switching means that discharges the discharged workpiece and the product separated from the workpiece by the cut-off work to different positions, the workpiece discharged from the processing machine side and the above product are both on the workpiece discharger side. It has the effect of being able to feed and collect separately efficiently.

  In addition, by configuring a machine tool, for example, an automatic lathe, integrally provided with the work discharge device, it has the various effects provided by the work discharge device, has high product recovery efficiency, and easily discharges remaining materials. There is an effect that a machine tool capable of being configured can be configured easily.

  FIG. 1 and FIG. 2 are a side view and a plan view of a workpiece discharge / recovery device using the workpiece discharge device of the present invention. This work discharge and collection device is disposed on the front end (front end) side of the spindle S of an automatic lathe L that is a machine tool. The automatic lathe L integrally fixes the main shaft S and the work W to the main shaft S that is driven to rotate about the front-rear direction by projecting a rod-shaped work W by a predetermined length from the tip. The portion of the workpiece W protruding from the guide bush G is processed by the processing tool T arranged in front of the guide bush G.

  When the automatic lathe L finishes machining the portion of the workpiece W that protrudes from the guide bush G, the automatic lathe L performs a cut-off operation in front of the guide bush G with a cut-off tool that is one of the processing tools T. Separate. Thereafter, the workpiece W is sequentially projected from the spindle S until a length required for machining the product cannot be projected, and a plurality of products are manufactured from one workpiece W.

  On the automatic lathe L, chips generated during processing of the workpiece W, workpieces remaining on the spindle S side in a state where the length required for processing the product cannot be projected (remaining material), the above products, etc. are dropped. When discharging, a bowl-like chute SH is provided that guides the discharge from the automatic lathe L side such as chips, remaining material, and products toward the workpiece discharge and recovery device obliquely forward and downward.

  The chute SH is provided so as to be inclined so that the end side (the front end side in the present embodiment) is lowered. Both ends of the chute SH are open. For this reason, the chute SH receives the above-mentioned chips, remaining materials, products, etc. on the rear end side, and this work is opened from the front end where the chips, remaining materials, products, etc. that move while sliding down in the chute SH are opened. Discharge toward the discharge collection device. The front end portion where the chute SH is opened constitutes a discharge port for chips, remaining materials, products, and the like. The automatic lathe L is conventionally known and will not be described in detail.

  As shown in FIGS. 1 to 4, the workpiece discharge / collection apparatus includes a stand 1 and a chuck unit 2. The stand 1 includes a bottom plate 3. A support column 4 is erected on the rear side of the bottom plate 3. A base plate 6 is integrally fixed on the support column 4. A remaining material chip collection box 7 for collecting the remaining material and chips is installed on the bottom plate 3 in front of the column 4. The opened upper part of the residual material chip collection box 7 is located directly under the discharge port of the chute SH.

  On the other hand, a vertical frame 8 is erected on the right side of the bottom plate 3. A fixed shooter 9 for product recovery is integrally fixed to the vertical frame 8. The fixed shooter 9 has a hook shape and is inclined so that the rear side is lowered. The rear end of the fixed shooter 9 is opened, and a product collection box (not shown) for collecting the product is installed below.

  A central vertical frame 11 is erected at a substantially horizontal center of the bottom plate 3. A recovery switching cylinder 12 is fixedly attached to the central vertical frame 11. The recovery switching cylinder 12 is an air cylinder. The recovery switching cylinder 12 is arranged in the front-rear direction so that the cylinder rod 12a protrudes rearward (automatic lathe L side) and expands and contracts (slides) back and forth.

  A movable shooter 13 for product recovery is integrally fixed to the cylinder rod 12a of the recovery switching cylinder 12. The movable shooter 13 has a hook shape and is inclined so that the fixed shooter 9 side (right side in the present embodiment) is lowered. Both ends of the movable shooter 13 are open, and the right end is positioned above the fixed shooter 9.

  When the cylinder rod 12a of the recovery switching cylinder 12 is in the contracted state, the movable shooter 13 has a product receiving posture A in which the left end portion is positioned substantially directly below the discharge port of the chute SH described above. When the recovery switching cylinder 12 extends and operates the cylinder rod 12a rearward, the movable shooter 13 is retracted such that the front end edge is located behind the front end of the chute SH and the left end is retracted from the discharge port of the chute SH. Posture B

  Both postures of the movable shooter 13 are switched by the expansion and contraction drive of the cylinder rod 12 a by the recovery switching cylinder 12. The recovery switching cylinder 12 is set as an initial state in which the cylinder rod 12a is extended and operated rearward. Therefore, the retractable posture B of the movable shooter 13 is set to the initial posture.

  When the automatic lathe L drops the product onto the chute SH during the product receiving posture A of the movable shooter 13, the product is transferred from the chute SH to the movable shooter 13, and is transferred from the movable shooter 13 to the fixed shooter 9. 9 and is collected in the product collection box.

  When chips or remaining materials are dropped onto the chute SH from the automatic lathe L side when the movable shooter 13 is in the retracted position B, the chips and remaining materials are not inherited from the chute SH to the movable shooter 13 and are directly omitted from the chute SH. It is discharged directly below and collected in the remaining material chip collection box 7.

  The collection switching cylinder 12, the movable shooter 13, the fixed shooter 9 and the like constitute the discharge switching means 10. The discharge switching means 15 can discharge the chips, the remaining material, and the product to different places by the operation of the recovery switching cylinder 12. Thereby, this workpiece | work discharge | emission collection | recovery apparatus can distinguish the said swarf and a remaining material, and a product separately, respectively, as mentioned above.

  The chuck unit 2 described above includes a unit slide cylinder 14 fixed on the base plate 6 of the stand 3. The unit slide cylinder 14 is an air cylinder. The unit slide cylinder 14 is attached in the front-rear direction so that the cylinder rod 14a protrudes rearward and expands and contracts (slides) back and forth.

  A main bracket 16 is integrally fixed to the front end (rear end) of the cylinder rod 14a. The main bracket 16 constitutes a frame of the main body 15 of the chuck unit 2. A main body 15 of the chuck unit 2 is formed on the main bracket 16.

  On the upper side of the main bracket 16, a chuck opening / closing cylinder 17 is integrally fixed substantially at the center in the left-right direction. The chuck opening / closing cylinder 17 is attached in the front-rear direction so that the cylinder rod 17a protrudes rearward and expands and contracts (slides) back and forth. The chuck opening / closing cylinder 17 is an air cylinder.

  Slide bushes 18 are provided on both the left and right sides of the main bracket 16 with the chuck opening / closing cylinder 17 interposed therebetween. Guide shafts 19 are inserted into the left and right slide bushes 18 so as to be slidable back and forth. A chuck opening / closing plate 21 is integrally fixed to a rear end portion of the guide shaft 19 protruding from the main bracket 16.

  The cylinder rod 17 a of the chuck opening / closing cylinder 17 is integrally fixed to the chuck opening / closing plate 21. The chuck opening / closing plate 21 slides back and forth using the guide shaft 19 as a guide by the longitudinal movement of the cylinder rod 17a by the chuck opening / closing cylinder 17.

  A pipe frame 22 in the form of a hollow pipe in the front-rear direction is integrally attached to a substantially central part in the vertical direction of the main bracket 16 at a substantially central part in the left-right direction. A pair of upper and lower chuck claws 23 a and 23 b are attached to the front end (rear end) side of the pipe frame 22 via a mounting plate 22 a protruding vertically.

  Both chuck claws 23a and 23b are pivotally supported by the mounting plate 22a so as to be swingable up and down, and are opposed to each other. As a result, the rear ends of the chuck claws 23a and 23b are opened and closed with each other to form an open / close chuck portion 26. A spring 24 is interposed between the front and rear sides of the swing fulcrum of both chuck claws 23a and 23b. The open / close chuck portion 26 is biased to an open posture by a spring 24.

  A tapered portion 27 is formed at the front end portions of both chucks 23a, 23b. On the other hand, an open / close driving body 28 having a tapered surface 28a corresponding to the tapered portion 27 is slidably fitted to the pipe frame 22 described above. The chuck opening / closing plate 21 is fitted in a groove portion 28b formed on the outer peripheral side of the opening / closing drive body 28.

  The tapered portions 27 of the chucks 23a and 23b are along the tapered surface 28a of the opening / closing drive body 28 by the urging force. For this reason, the opening / closing drive body 28 is driven to slide back and forth along the pipe frame 22 by the longitudinal movement of the cylinder rod 17a by the chuck opening / closing cylinder 17, so that the opening / closing chuck portion 26 opens and closes.

  The open / close chuck portion 26 is switched to a closed position by the chuck open / close cylinder 17 extending the cylinder rod 17a backward and moving the open / close drive body 28 backward. In the chuck opening / closing cylinder 17, the contracted state of the cylinder rod 17a is set as an initial state. For this reason, the open / close chuck portion 26 is set to an open posture as an initial posture.

  As described above, the opening / closing driving means 25 of the opening / closing chuck portion 26 is formed by the opening / closing cylinder 17, the opening / closing drive body 28, the chuck opening / closing plate 21 and the like, and both the postures of the opening / closing chuck portion 26 are driven by the expansion / contraction driving of the cylinder rod 17a by the opening / closing cylinder 17. Is switched.

  A guide pipe 29 made of a hollow pipe is concentrically inserted into the pipe frame 22 so as to be slidable. The front end side of the guide pipe 29 is integrally fixed to the cylinder rod 31 a of the guide pipe cylinder 31. The guide pipe cylinder 31 is attached to a bracket 32 fixed to the main bracket 16.

  The guide pipe cylinder 31 is attached in the front-rear direction so that the cylinder rod 31a protrudes rearward and expands and contracts (slides) in the front-rear direction. The guide pipe cylinder 31 is an air cylinder.

  As a result, the guide pipe 29 is in the accommodated posture X in which the rear end is accommodated in the pipe frame 22 in a contracted state of the cylinder rod 31 a of the guide pipe cylinder 31. When the guide pipe cylinder 31 extends and operates the cylinder rod 31a rearward, the guide pipe 29 assumes a guide posture Y in which the rear end protrudes forward of the open / close chuck portion 26 in the open state.

  The guide pipe 29 is switched to both the above postures by the expansion and contraction drive of the cylinder rod 31 a by the guide pipe cylinder 31. In the guide pipe cylinder 31, the contracted state of the cylinder rod 31a is set as an initial state. For this reason, the accommodation posture X of the guide pipe 29 is set as the initial posture.

  As described above, the main body 15 of the chuck unit 2 configured on the main bracket 16 slides back and forth by the expansion and contraction drive of the cylinder rod 14a by the unit slide cylinder 14, and moves to the axis of the main shaft S with respect to the main shaft S. Move forward and backward along. The unit slide cylinder 14 constitutes an advancing / retreating means for advancing / retreating the open / close chuck portion 26 together with the main body 15 back and forth along the axis of the main shaft S with respect to the main shaft S.

  The main body 15 takes a separated posture in which the cylinder rod 14a of the unit slide cylinder 14 is greatly separated from the automatic lathe L in a contracted state. When the unit slide cylinder 14 extends and operates the cylinder rod 14a backward, the main body 15 takes a close attitude approaching the automatic lathe L from the front.

  In the unit slide cylinder 14, the contracted state of the cylinder rod 14a is set as an initial state. For this reason, the chuck unit 2 is set with the separation posture of the main body 15 as an initial posture, and both postures are switched by the expansion and contraction drive of the cylinder rod 14 a by the unit slide cylinder 14.

  The cylinders 12, 14, 17, 31 are controlled so as to be driven in cooperation by a controller (not shown). Further, the arrangement of the chuck unit 2 and the height of the stand 1 are set in advance so that the axis of the pipe frame 22 and the axis of the main shaft S are aligned.

  The workpiece discharge and collection apparatus is configured as described above. As shown in FIG. 5, when the workpiece W is machined by the machining tool T, all the cylinders 12, 14, 17, and 31 are set to the initial state. . Therefore, the main body 15 of the chuck unit 2 takes the separation posture β, and the movable shooter 13 takes the retracted posture B. The open / close chuck portion 26 takes an open posture σ, and the guide pipe 29 takes a storage posture X.

  As a result, the chuck unit 2 does not interfere with the workpiece processing, and chips during the processing of the workpiece W are collected in the chip residue collection box 7 via the movable shooter 13 and the fixed shooter 9, and the automatic lathe L The workpiece W can be processed smoothly.

  As shown in FIG. 6, at the time of parting work by the parting tool T ′, the guide pipe cylinder 31 and the unit slide cylinder 14 are switched from the initial state to the extending operation state of the cylinder rods 31a and 14a, and the recovery switching cylinder 12 is The cylinder rod 12a is switched to the contracted state.

  As a result, the guide pipe 29 is switched to the guide posture Y, the main body 15 of the chuck unit 2 is switched to the proximity posture α, and the movable shooter 13 is switched to the product receiving posture A. Since the chuck opening / closing cylinder 17 is in an initial state, the opening / closing chuck portion 26 assumes an open posture σ. Since the open / close chuck portion 26 is in the open posture σ, the guide pipe 29 can protrude rearward from between the chuck claws 23a and 23b.

  The front end of the workpiece W is inserted into the guide pipe 29 depending on the posture of each part of the workpiece discharge / recovery device. However, the chuck unit 2 can insert the cutting tool T ′ between the rear end of the guide pipe 29 and the guide bush G when the main body 15 is in the proximity position α and the guide pipe 29 is in the guide position Y as described above. Is set in advance.

  When the workpiece W is cut off from this state by the cut-off tool T ', the front end of the workpiece W is inserted and held in the guide pipe 29, so that the product is prevented from jumping due to the impact at the time of cut-off, and the product falls on the chute SH. To do. As a result, the product is transferred from the chute SH to the movable shooter 13 and is collected from the fixed shooter 9 to the product collection box.

  As shown in FIG. 7, when collecting the remaining material, the unit slide cylinder 14 is switched from the initial state to the extending operation state of the cylinder rod 14a. As a result, the main body 15 of the chuck unit 2 is switched to the proximity posture α, and the end portion of the remaining material is inserted into the open / close chuck portion 26 in the open posture σ. From this state, the chuck opening / closing cylinder 17 is switched to the extending operation state of the cylinder rod 17a.

  As a result, the open / close chuck portion 26 is in the closed posture γ and grips (chucks) the end portion of the remaining material W ′. In order to increase the protruding length of the remaining material W ′ from the guide bush G, the main shaft S slides toward the guide bush G side. In some cases, the rear end of the remaining material W ′ may be pushed by a pushing arrow to cause the remaining material W ′ to protrude toward the opening / closing chuck portion 26.

  From the state where the remaining material W ′ is chucked by the opening / closing chuck portion 26 as described above and the integrated fixing of the remaining material W ′ by the main shaft S is released, the unit slide cylinder 14 is changed to the initial state as shown in FIG. By switching, the chuck unit 2 can draw the remaining material W ′ from the main shaft S forward because the main body 15 assumes the separation posture β.

  By switching the chuck opening / closing cylinder 17 from the state in which the remaining material W ′ is pulled forward from the main shaft S to the initial state as described above, the open / close chuck portion 26 is switched to the open posture σ, and the remaining material W ′ is removed from the chute SH. Fall and discharge. As described above, the chuck unit 2 constitutes a workpiece discharge device for discharging the workpiece (remaining material) W ′ from the spindle S.

  At this time, since the recovery switching cylinder 12 is in the initial state, the movable shooter 13 takes the retracted posture B, and the remaining material W ′ that has been dropped and discharged is recovered from the chute SH into the chip residue recovery box 7. Since the guide pipe cylinder 31 is in the initial state, the guide pipe 29 has the accommodation posture X, and does not hinder the chucking of the remaining material W ′ by the opening / closing chuck portion 26.

  With this structure, the workpiece discharge / recovery device discharges the remaining material W ′ by the chuck unit 2 (work discharge device) and collects the discharged remaining material W ′ in the same manner as a conventional chuck for discharging the remaining material. In addition, it is possible to guide the workpiece W during the cut-off work. Thereby, it is not necessary to provide a special guide for the workpiece W during the cut-off operation, and the guide can be installed at low cost.

  When the workpiece W is cut off, by guiding the workpiece W, the product can be prevented from jumping off, and the workpiece (product) can be dropped almost directly in front of the spindle S by the cutting-off operation. Can be improved. In the present embodiment, since the chuck unit 2 (work discharge device) side includes the discharge switching means 10, it is possible to easily separate and collect the chips, the remaining material, and the product.

  Since the guide pipe 29 which is a guide means made of a hollow pipe is integrally provided on the open / close chuck portion 26 side, the open / close chuck portion is operated by the unit slide cylinder 14 which is a forward / backward moving means of the open / close chuck portion 26 (main body 15). 26 moves close to or away from the main shaft S. For this reason, it is not necessary to provide a forward / backward moving means for the special main shaft 26 for the guide pipe 29, and the guide means for holding and guiding the tip of the workpiece W at the time of cut-off can be simply configured.

  Since the axis of the guide pipe 29 and the axis of the main shaft S coincide with each other on a straight line, the tip of the workpiece W mounted on the axis of the main shaft S by the back-and-forth movement of the guide pipe 29 is easily attached to the guide pipe 29. Inserted. Since the guide means is simply constituted by the guide pipe 29, the guide pipe 29 is easily assembled in the pipe frame 22 on the open / close guide portion 26 side.

  In addition, the workpiece discharge / recovery device is integrally attached to a machine tool such as the automatic lathe L, and a workpiece discharge device (chuck unit 2) is integrally provided on the machine tool side via the work discharge / recovery device. A machine tool provided with a discharge device can be configured easily. In this case, it is possible to simply configure a machine tool that has the respective functions and effects provided in the workpiece discharge device, has high product recovery efficiency, and can easily discharge the remaining material.

It is a side view of this work discharge | emission collection | recovery apparatus. It is a top view of this work discharge | emission collection | recovery apparatus. It is a front view of this work discharge | emission collection | recovery apparatus. It is a center right sectional view of a chuck unit portion. It is a side view of the workpiece | work discharge | emission collection | recovery apparatus at the time of the normal processing of a workpiece | work. It is a side view of the workpiece | work discharge | emission collection | recovery apparatus at the time of cut-off work. It is a side view of the workpiece | work discharge | emission collection | recovery apparatus at the time of chucking of remaining material. It is a side view of the workpiece | work discharge | emission collection | recovery apparatus at the time of discharge | emission of a remaining material.

Explanation of symbols

10 Discharge switching means 14 Unit slide cylinder (advance / retreat means)
23a Chuck claw 23b Chuck claw 26 Opening / closing chuck part (gripping means)
29 Guide pipe (hollow pipe)
S Spindle X Storing posture Y Guide posture W Work W 'Remaining material (work)

Claims (6)

  A workpiece (W) that is detachably fixed to the tip of the spindle (S) that is driven to rotate is disposed on the tip of the spindle of a machine tool that uses a machining tool to process the workpiece (W), and the spindle (S) of the workpiece (W). Gripping means (26) for gripping the projecting portion from the head and forward / backward moving means (14) for moving the gripping means (26) forward and backward relative to the main shaft (S) are provided, and the gripping means (26) In the workpiece discharge device for discharging the workpiece (W ′) released from the fixation to the spindle (S) by retreating in a direction away from the spindle (S) in the gripping state of W), Guide means for holding and guiding the tip side of the workpiece (W) at the time of the cut-off operation of the workpiece (W) that has completed the machining of the predetermined machining portion protruding from the spindle (S) is provided. S) Workpiece discharge device that is integrally attached to the gripping means (26) side so as to perform the guide by contact movement.   The work discharging apparatus according to claim 1, wherein the guide means comprises a hollow pipe (29), and the work is guided by inserting the tip end side of the work (W) into the hollow pipe (29).   The attitude of the hollow pipe (29) constituting the guide means can be switched between a guide attitude (Y) protruding from the gripping means toward the main shaft (S) and an accommodation attitude (X) accommodated on the gripping means (26) side. The work discharging apparatus according to claim 2, wherein the work discharging apparatus is provided.   The gripping means (26) is composed of a pair of opposing chuck claws (23a) and (23b), and the workpiece (W) is gripped and released by opening and closing the chuck claws (23a) and (23b). The work discharging apparatus according to claim 1, 2 or 3.   The workpiece discharge according to claim 1, further comprising discharge switching means (10) for discharging the discharged workpiece (W ') and the product separated from the workpiece (W) by the cut-off operation to different positions. apparatus.   A machine tool provided with a workpiece ejection device integrally provided with the workpiece ejection device according to claim 1 or 2 or 3 or 4 or 5.

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