TW202015852A - Workpiece support - Google Patents

Abstract

A support rod (2), an advancing spring (43), and an output member (24) are disposed on a housing (1) in the stated order from the upper side. When the support rod (2) is moved to a lower-limit position, the support rod (2) may be affixed to the housing (1) due to some abnormality. An engaging part (70) of the output member (24), which is moved upward toward the support rod, collides with a locking part (71) of the support rod (2) to thereby undo the aforementioned state of fixation.

Description

Workpiece support

The invention relates to a device for supporting a workpiece when the workpiece is processed by a working machine such as a milling machine or a grinder.

For such a workpiece supporter, there has conventionally been described in Patent Document 1 (Japanese Patent Laid-Open No. 2003-307205). This prior art is constructed as follows.

The cylindrical support rod inserted into the upper wall of the casing can move up and down in the casing. An output member that can move up and down is inserted in the lower portion of the cover. The fully threaded bolt is screwed into the barrel hole of the support rod. An entry and exit spring is installed between the full-thread bolt and the output member, and the entry and exit spring urges the support rod and the output member away. Then, by driving upward toward the output member, the output member moves the support rod upward through the entry and exit springs. In this way, the upper end surface of the support block supports the lower surface of the workpiece placed on the mounting table from below. The application force of the entry/exit spring has an application force to the extent that it opposes the weight of the support rod, friction resistance, etc., but is set to have an application force to the extent that the workpiece is not lifted from the mounting table. Moreover, a sufficient gap is formed between the upper end of the output member and the lower end of the full-thread bolt, and also when the support rod moves to the lower limit position and the output member moves to the upper limit position, the full-thread bolt does not contact the output member. Through this, the output member is constituted to indirectly press the work support through the entry and exit springs. As a result, the output member does not lift the workpiece from the mounting table through the workpiece supporter, thereby preventing the machining accuracy of the workpiece from deteriorating. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2003-307205

[Problem to be solved by invention]

When the workpiece supporter is in the released state, any reason, for example, is that the supporting rod is fixed to the upper wall of the housing due to the falling chips and cutting oil. In this case, even if the output member presses the support lever upward, the above-mentioned fixed state cannot be released by the entry-exit spring having an applied force that does not lift the workpiece as described above.

An object of the present invention is to provide a workpiece supporter that can release the state in which the support rod and the cover of the workpiece supporter are fixed for any reason. [Means to solve the problem]

In order to achieve the above object, the first invention is, for example, shown in FIGS. 1 to 3, 4, 5A, and 5B, and the work support is configured as follows. The support rod 2 that can move toward the end side and the base end side in the axial direction in the housing 1 is inserted into the end wall 1 a of the housing 1. The ring-shaped collet 5 is fitted around the outer periphery of the aforementioned support rod 2. The piston 12 inserted into the cylinder bore 11 formed in the axial direction in the casing 1 is driven by the axial direction of the piston 12 to lock the support rod 2 through the collet 5. An output member 24 that can move in the axial direction is inserted into the base end wall 1b of the aforementioned housing 1. The support rod 2 and the output member 24 are biased by the biasing means and separated. When the support rod 2 at the limit position on the base end side is fixed to the fixed state of the housing 1 due to any abnormality, the output member 24 moves from the base end side to the end side via Thus, the engaging portion 70 formed on the output member 24 is pressed from the base end side to the engaging portion 71 formed on the support rod 2 to release the fixed state.

In the work support of the above-mentioned first invention, in the released state moving to the limit position on the base end side, for any reason, for example, chips and cutting oil accumulated on the end portion of the housing are dropped, and the support rod It is fixed to the end wall of the housing. In this case, by moving the output member toward the tip side, the engaging portion of the output member is brought into contact (collision) with the locking portion of the support rod. As a result, the fixed state of the support rod and the cover can be surely released.

The first invention described above is preferably a combination of the following (1) to (3). (1) For example, as shown in FIGS. 1 to 3, 4, 5A, and 5B, the distance S from the limit position on the proximal end side of the output member 24 to the limit position on the end side is set to be less than The distance H from the engaging portion 70 of the output member 24 to the locking portion 71 of the support rod 2 is longer. In this case, the engaging portion of the output member is surely abutted (collided) to the locking portion of the support rod at the limit position on the base end side. Therefore, by the impact of the collision, the fixed state of the support rod and the cover is surely released.

(2) The urging means is constituted by the operating chamber 15 formed on the base end side of the support rod 2 and the operating pressure fluid supplied to the operating chamber 15. In this case, the support rod is surely raised by the urging means configured as described above.

(3) The urging means is constituted by the access spring 43 installed between the support rod 2 and the output member 24. In this case, the support rod is surely raised by the urging means configured as described above.

In order to achieve the above object, the second invention is, for example, as shown in FIGS. 6A and 6B, and the work support is configured as follows. The support rod 2 that can move toward the end side and the base end side in the axial direction in the housing 1 is inserted into the end wall 1 a of the housing 1. The ring-shaped collet 5 is fitted around the outer periphery of the aforementioned support rod 2. The piston 12 is inserted into the cylinder bore 11 formed in the axial direction in the aforementioned housing 1. By driving the piston 12, the piston locks the support rod 2 through the collet 5. An output member 24 that can move in the axial direction is inserted into the base end wall 1b of the aforementioned housing 1. The access spring 43 installed between the support rod 2 and the output member 24 is urged to separate the support rod 2 and the output member 24. When the aforementioned entry-exit spring 43 is compressed to the bottom, the adjacent windings of the entry-exit spring 43 are in close contact with each other. When the support rod 2 at the limit position on the base end side is fixed to the fixed state of the housing 1 due to any abnormality, the output member 24 moves from the base end side to the end side through Thus, the output member 24 is pressed from the base end side to the support rod 2 through the advancing spring 43 in the tight state to release the fixed state.

Fig. 1 shows a first embodiment of the present invention. In this embodiment, the case where the present invention is applied to an air-pressure type work support is exemplified. First, the structure of the work support described above will be described.

The cover 1 of the work support is screwed to a receiving hole formed in the bed T as a fixed table. The housing 1 includes an upper wall (end wall) 1a, a lower block 1b constituting a lower wall (base end wall), and a carcass portion 1c. The support rod 2 is inserted into the housing 1 and can be moved in the up-down direction (the end side and the base end side in the axial direction). On the upper part of the support rod 2, a full-thread bolt 3 that is in contact with the work W is provided.

A pinch fixing area R is provided in the lower half of the outer peripheral surface of the support rod 2, and a cylindrical collet 5 is fitted into the pinch fixing area R. The collet 5 includes a push-out outer peripheral surface 5a that narrows upward, and is elastically reduced in diameter by a slit 5b extending in the vertical direction. An annular gear 6 is arranged on the outer peripheral side of the collet 5, and the push-out inner peripheral surface 6a of the gear 6 faces the push-out outer peripheral surface 5a of the collet 5 from above. A plurality of balls 8 are inserted into the annular pushing gap 7 formed between the pushing outer peripheral surface 5a and the pushing inner peripheral surface 6a.

The first cylinder 10 for actuation includes a first cylinder bore (cylinder bore) 11 formed in the carcass portion 1c of the housing 1, and the first cylinder bore 11 inserted between the first cylinder bore 11 and the transmission 6 An annular first piston (piston) 12, an operating chamber 13 that lowers the first piston 12, and a first spring 14 that raises the first piston 12. The first spring 14 is attached to the spring chamber 15 formed on the lower side of the transmission 6.

In more detail, the upper part of the above-mentioned first piston 12 is guided to the upper wall 1a by the sealing member 16 while maintaining the sealing state, and the lower part of the first piston 12 is guided by the other sealing member 17 while maintaining the sealing state. Lead to the lower block 1b. Next, by supplying compressed air to the operating chamber 13, a downward force acts on a large-area annular pressure-receiving surface formed on the upper end of the first piston 12, and an upward force acts on the pressure formed on the first piston 12. The small area of the annular pressure receiving surface at the lower end causes the first piston 12 to descend due to these upper and lower differential forces.

The aforementioned first spring 14 is here constituted by a compression coil spring, and is installed between a spring receiver 19 installed above the lower surface of the transmission 6 and a spring receiver 20 installed below the lower end of the collet 5. Moreover, the upper spring bearing 19 catches the plurality of balls 8. Then, the urging force of the first spring 14 transmits the lower spring receiver 20 to contact the lower end of the collet 5 with the lower block 1b.

A second cylinder 21 for advancing and retreating is provided in the lower block 1b described above. The second cylinder 21 is configured as follows. In the lower block 1b, the large-diameter second cylinder bore 22 and the small-diameter rod hole 23 are connected in series upward. The second piston 25 of the output member 24 is inserted into the second cylinder bore 22 in a sealed state through the sealing member 25a, and the piston rod 26 of the output member 24 is inserted into the rod hole 23. In addition, in the present embodiment, both the second piston 25 and the piston rod 26 are configured as separate bodies, but the two may be integrated as one.

The lower wall 30 of the second cylinder bore 22 described above is constituted by the bottom wall of the receiving hole, and an inlet chamber 31 is formed between the lower wall 30 and the second piston 25. The compressed air supply and discharge port 32 is connected to the inlet chamber 31. Furthermore, an outlet chamber 35 is formed between the upper wall 34 of the second cylinder bore 22 and the second piston 25. The second spring 36 that retracts the second piston 25 downward is installed between the upper wall of the rod hole 23 and the piston rod 26. In this embodiment, the second spring 36 is composed of a compression coil spring. In addition, in this embodiment, the driving means for moving the output member 24 upward is constituted by the inlet chamber 31 and the compressed air supplied to the inlet chamber 31. The driving means for moving the output member 24 downward is constituted by the second spring 36.

A flange portion 42 is formed at the tip portion of the aforementioned piston rod 26, and the flange portion 42 is engaged with the operated portion 2a of the support rod 2 from the upper side. Between the flange portion 42 of the piston rod 26 and the full-thread bolt 3, an access spring (urging means) 43 that urges the support rod 2 upward is attached. In this embodiment, the entry-exit spring 43 is composed of a compression coil spring.

Furthermore, a switching means 48 for connecting the operation chamber 13 to one of the inlet chamber 31 and the outlet chamber 35 is provided. More specifically, a communication hole 49 is formed between the operation chamber 13 and the upper part of the second cylinder hole 22. The switching means 48 is constituted by the opening of the communication hole 49 and the outer peripheral surface of the second piston 25.

The operation of the workpiece supporter will be described with reference to FIGS. 1 and 2. In the released state shown in FIG. 1, the first piston 12 and the transmission 6 are raised by the first spring 14, and thus, the reduced diameter of the collet 5 is released. Furthermore, the second piston 25 and the piston rod 26 are lowered by the second spring 36. With this, the flange portion 42 of the piston rod 26 resists the entry and exit spring 43 and lowers the support rod 2. Here, the output member 24 of the present embodiment is movable from the lower limit position shown in FIG. 1 (the limit position on the base end side) to the upper limit position shown in FIG. 2 (the limit position on the end side). The movable stroke S of 24 is shown in Fig. 1. Furthermore, in the released state of the work support shown in FIG. 1, the engaging portion 70 of the output member 24 at the lower limit position (the limit position on the base end side) is separated to the lower limit position (the limit position on the base end side) It is attached to the locking portion 71 of the pressure bolt 3 of the support rod 2 and the distance is indicated by the symbol H in FIG. 1. The movable stroke S of the output member 24 described above is set to be longer than the distance H from the engaging portion 70 to the locking portion 71. Furthermore, the fixing bolt 3 is a member constituting a part of the support rod 2.

In the above release state, the workpiece W is carried horizontally to the position above the full-thread bolt 3. Next, when the above-mentioned work support is driven from the released state of FIG. 1 to the locked state of FIG. 2, compressed air is supplied from the supply and discharge port 32 to the inlet chamber 31. In this way, first, the compressed air in the inlet chamber 31 causes the second piston 25 and the piston rod 26 to rise against the second spring 36. Next, the flange portion 42 of the piston rod 26 raises the support rod 2 through the access spring 43 and the full-thread bolt 3. In this way, the upper end surface of the full-thread bolt 3 abuts on the workpiece W. In this state, a gap is formed between the lower surface of the flange portion 42 of the piston rod 26 and the operated portion 2a of the support rod 2 in the up-down direction, and also on the upper end surface of the piston rod 26 and the full-thread bolt Between the lower end surfaces of 3, the contact gap is formed in the up-down direction.

Next, via the movement toward the upper limit position of the second piston 25 described above, the sealing member 25 a of the second piston 25 passes through the communication hole 49. In this way, the compressed air supplied to the discharge port 32 passes through the inlet chamber 31 and the communication hole 49 in order, and is supplied to the operation chamber 13. Next, when the pressure of the operating chamber 13 exceeds a predetermined set pressure, the differential force in the vertical direction of the air pressure acting on the first piston 12 from the operating chamber 13 acts on the transmission 6. When the differential force in the downward direction moves the transmission device 6 downward, the push-pull inner peripheral surface 6a of the drive device 6 smoothly engages with the push-pull outer peripheral surface 5a of the collet 5 while rotating the ball 8, so that Collet 5 reduced diameter. Through this, the reduced-diameter collet 5 presses the outer peripheral surface of the support rod 2 toward the axis, and locks (holds and fixes) the support rod 2 at the height position shown in FIG. 2. In the locked state, the upper surface of the workpiece W is machined, and the downward force during the machining is strongly received from below by the support force of the support rod 2 from below.

After the above-mentioned machining is completed, the compressed air in the inlet chamber 31 is discharged. In this way, first, the second piston 25 and the piston rod 26 descend, and the flange portion 42 of the piston rod 26 abuts on the operated portion 2 a of the support rod 2 in the locked state from the upper side. For this reason, the flange portion 42 of the entry-exit spring 43 surely prevents the support rod 2 from rising, and thereafter, the locked state of the support rod 2 is released. In more detail, it is as follows.

Through the discharge of the compressed air described above, first, the second piston 25 and the piston rod 26 are lowered by the second spring 36. Next, the compressed air of the operation chamber 13 passes through the aforementioned communication hole 49, the outlet chamber 35, the rod hole 23, the cylindrical hole of the support rod 2, the communication groove 45 formed between the lower wall 1b and the lower surface of the support rod 2, the spring The chamber 15 and the vertical hole 46 formed in the lower wall in the vertical direction are discharged to the outside. Next, when the pressure in the actuating chamber 13 is lower than the predetermined set pressure, the first piston 12 and the transmission tool 6 are pressed upward by the first spring 14, and the ball 6 rotates while pushing the inner peripheral surface 6a of the transmission tool 6 While moving upward smoothly, the pressing state of the push-out outer peripheral surface 5a of the collet 5 is released. Through this, the collet 5 expands in diameter by its own elastic restoring force, and releases the locked state of the support rod 2. Therefore, the second piston 25 and the piston rod 26 are further lowered, and the support rod 2 is returned to the lowered position in FIG. 1.

The work supporter operates under the following abnormal conditions as follows. In the above-mentioned release state, accumulated chips or cutting oil fall between the upper wall 1a of the work support and the support rod 2, or the sliding resistance of the support rod 2 relative to the housing 1 increases due to long-term deterioration. This is because the upper wall 1a and the outer peripheral wall of the support rod 2 are fixed (abnormal state). In this abnormal state, in the aforementioned conventional work supporter, even if the second piston pushes the support rod upward through the piston rod and the entry/exit spring, the support rod cannot rise due to the above-mentioned fixation.

In the workpiece supporter of the present embodiment, in the above-mentioned abnormal state, when the compressed air is supplied from the supply/discharge port 32 to the inlet chamber 31 at the time of lock driving, the compressed air of the inlet chamber 31 resists the urging force of the second spring 36 The second piston 25 is raised. At this time, the support rod 2 is fixed to the upper wall 1 a of the housing 1, and the movement toward the upper side of the support rod 2 is restricted. Next, the engaging portion 70 formed on the upper portion of the piston rod 26 collides with the locking portion 71 formed on the lower end portion of the pressing bolt 3. Through this, the impact force or pressing force of the collision is applied to the support rod 2 through the pressure bolt 3, and then, the piston rod 26 pushes the support rod 2 upward (in this embodiment) by about 0.2 mm. As a result, the fixed state of the support rod 2 and the upper wall 1 is released. Next, by the spring application force of the entry/exit spring 43, the support rod 2 rises, and the upper end surface of the pressing bolt 3 is abutted against the lower end surface of the work W. Thereafter, as described above, the first piston 12 locks (holds and fixes) the support rod 2 through the collet 5 at a predetermined height position. The distance (upward pushing amount) of the piston rod 26 pushing up the support rod 2 is not limited to about 0.2 mm, for example, it may be from 0.2 mm to 0.5 mm. In this case, the distance from the upper end surface of the fully-threaded bolt 3 in the released state to the lower surface of the workpiece W is set to be longer than the aforementioned amount of push-up. Through this, while the support rod 2 is pushed up by the piston rod 26, the upper end surface of the support rod 2 (the upper end surface of the compression bolt 3 constituting a part of the support rod 2) does not contact the lower surface of the work W, which can be prevented The piston rod 26 directly pushes up the workpiece W through the support rod 2.

The aforementioned first embodiment exerts the following advantages. In the released state, when the support rod 2 is fixed to the upper wall 1a of the housing 1 in the released state, the output member 24 is moved upward, and the engaging portion 70 of the output member 24 collides To the locking portion 71 of the support rod 2, the fixed state of the support rod 2 and the housing 1 is surely released. Furthermore, in the present embodiment, the output rod 24 is connected from the upper limit position, that is, just below the upper limit position to the upper limit position, and can abut on the support rod 2 at the lower limit position. In addition, the output lever 24 constitutes that the support lever 2 only moves upward from the release position (lower limit position) shown in FIG. 1, making it impossible to contact. For this reason, the entry-exit spring 43 is similar to the conventional entry-exit spring and has an applied force to the extent that it resists the weight of the support rod, frictional resistance, etc. However, it is possible to adopt an entry and exit with an applied force to the extent that the workpiece is not lifted from the mounting table Spring 43.

4, 5A and 5B, 6A and 6B show the second to fourth embodiments of the present invention. In the second to fourth embodiments, the members having the same configuration as the first embodiment described above are given the same reference symbols in principle, and the configuration different from the first embodiment will be described.

The second embodiment shown in FIG. 4 is different from the first embodiment described above in the following points. The cylindrical collet 5 is externally fitted to the outer peripheral surface of the support rod 2 inserted into the housing 1. In addition, the collet 5 of this embodiment is pressed against the lower block 1b by the elastic body 51 made of rubber. In addition, the elastic body 51 may be formed of a spring member such as a wave washer, a disc spring, a coil spring, etc. in addition to rubber.

A second cylinder 21 for advancing and retreating is provided in the lower portion of the housing 1. The second cylinder 21 system is configured as follows. A second cylinder bore 22 is formed in the lower block 1b of the housing 1, and the second piston 25 is inserted into the second cylinder bore 22 while maintaining a seal. The piston rod 26 is provided to protrude upward from the second piston 25, and the piston rod 26 is inserted into the cylindrical hole of the support rod 2. The second operating chamber 52 formed on the lower side of the second piston 25 can communicate with the first operating chamber 13 through the communication passage 53. The throttle passage 54 is formed by an annular gap formed between the inner peripheral surface of the first cylinder bore 11 and the outer peripheral surface of the first piston 12. The second piston 25 and the piston rod 26 constitute an output member 24.

When the work support is in the released state, the hydraulic oil is discharged from the second operating chamber 52. Therefore, the first piston 12 is raised by the first spring 14 to release the diameter reduction of the collet 5. Furthermore, the second piston 25 and the piston rod 26 are lowered by the second spring 36. With this, the flange portion 42 lowers the aforementioned support rod 2. Furthermore, compressed air (pressure fluid for operation) is supplied to the spring chamber (actuation chamber) 15 through the supply passage 46 formed in the lower wall 1 b of the housing 1. The compressed air of the spring chamber 15 urges the support rod 2 upward. In this embodiment, the urging means for urging the support rod 2 upward relative to the housing 1 is constituted by the compressed air supplied to the spring chamber 15 and the spring chamber 15.

When the work supporter is moved from the released state to the locked state, the work W is carried horizontally to the position above the full-thread bolt 3. Thereafter, the hydraulic oil from the hydraulic oil source is supplied to the second operating chamber 52 through the supply and discharge port 32. In this way, with the hydraulic oil of the second operating chamber 52, the second piston 25 and the piston rod 26 rise against the second spring 36, and the flange portion 42 of the piston rod 26 moves upward from the operated portion 2a of the support rod 2. Next, the compressed air supplied to the spring chamber 15 moves the support rod 2 upward. Next, the full-thread bolt 3 abuts on the work W. In this state, a contact gap is formed in the up-down direction between the flange portion 42 of the piston rod 26 and the operated portion 2a of the support rod 2.

Next, the hydraulic oil of the second operation chamber 52 is slowly supplied to the first operation chamber 13 through the communication passage 53. When the pressure of the first actuation chamber 13 is insufficient (below a predetermined pressure), the first piston 12 is maintained at the upper limit position by applying a force upward of the first spring 14. Then, when the pressure of the first actuation chamber 13 exceeds a predetermined pressure, the difference in the vertical direction of the pressure acting on the first piston 12 from the first actuation chamber 13 resists the application above the first spring 14 Force to move the first piston 12 downward. In this way, the push-pull inner peripheral surface 6a of the first piston 12 smoothly engages the push-pull outer peripheral surface 5a of the collet 5 while rotating the ball 8 to reduce the diameter of the collet 5. With this, the reduced-diameter collet 5 presses the outer peripheral surface of the support rod 2 toward the inside in the radial direction to hold and fix the support rod 2 to a predetermined height position. In this locked state, the upper surface of the workpiece W is machined, and the supporting rod 2 receives the downward force during the processing, that is, a strong external force acting in the vertical direction. In this embodiment, the predetermined height position of the support rod 2 is set to be higher (the end side) than the height position at which the engaging portion 70 of the output member 24 and the locking portion 71 of the support rod 2 can abut. That is, a gap is formed between the locking portion 71 of the support rod 2 when supporting the work W and the engaging portion 70 of the output member 24. Through this, the output member 24 prevents the work W from being lifted from the mounting table through the support rod 2, and as a result, the processing accuracy of the work W can be prevented from deteriorating.

When the work support is actuated from the locked state to the released state, the hydraulic oil of the second actuation chamber 52 is discharged to the outside after the completion of machining. In this way, first, the first spring 14 presses the first piston 12 upward, and the push-pull inner peripheral surface 6a of the first piston 12 moves the ball 8 upward while rotating smoothly, releasing the push-pull outer peripheral surface of the collet 5 Pressing state of 5a. Through this, the collet 5 expands in diameter by its own elastic restoring force, and releases the locked state of the support rod 2. At the same time, the second spring 36 lowers the second piston 25 and the flange portion 42 lowers to drive the support rod 2.

In the abnormal state shown in FIG. 4, the work supporter operates as follows. In the above-mentioned release state, accumulated cutting chips, cutting oil, etc. fall between the upper wall 1a of the work support and the support rod 2, whereby the upper wall 1a and the outer peripheral wall of the support rod 2 are fixed (abnormal state) .

In the abnormal state described above, when the work support of this embodiment is locked and driven, if hydraulic oil is supplied from the discharge port 32 to the second actuation chamber 52, the hydraulic oil of the second actuation chamber 52 resists the urging force of the second spring 36 The second piston 25 is raised. At this time, the support rod 2 is fixed to the upper wall 1a of the housing 1 to restrict the movement in the vertical direction. Next, the engaging portion 70 formed in the restraining ring 72 of the piston rod 26 collides with the locking portion 71 formed in the operated portion 2 a of the support rod 2. Through this, the piston rod 26 directly pushes the support rod 2 strongly. As a result, the fixed state of the support rod 2 and the upper wall 1a is released. In this way, the upward force of the compressed air of the spring chamber 15 causes the support rod 2 to rise, and the upper end surface of the compression bolt 3 abuts against the lower end surface of the workpiece W. Thereafter, as in the first embodiment described above, the first piston 12 holds the support rod 2 through the collet 5 and fixes it at a predetermined height.

The points of difference between the third embodiment shown in FIGS. 5A and 5B and the above-described first embodiment are as follows. A cylindrical central member 56 is provided upward at the lower center of the cover 1 of the work support, and a lower flange 56a of the center member 56 is pressed and fixed to the cover 1 by a lower block 1b.

In the cover 1 described above, the support rod 2 is supported so as to be movable in the vertical direction. The cylindrical member 57 is screwed to the upper end of the support rod 2. The lower half of the support rod 2 is fitted into the center member 56 with a predetermined gap. This gap constitutes a part of the air flow path 58 described later.

The second piston 25 is inserted into the cylindrical hole of the above-mentioned center member 56 while maintaining a seal. On the bed T, a supply and discharge port 32 for supplying and discharging compressed air is formed, and the supply and discharge port 32 communicates with the operation chamber 52 through a communication path 53. The partial divergent flow path 73 communicates with the first operation chamber 13 in the middle of the communication path 53. The flow path 73 is provided with a throttle 74.

An air supply port 59 for supplying compressed air is provided on the upper right of the cover 2. Moreover, the valve member 61 is inserted into the cylindrical hole of the cylindrical member 57 so as to be movable in the vertical direction. An outlet passage 60 is formed between the outer peripheral wall of the valve member 61 and the cylindrical hole and upper end surface of the cylindrical member 57. The groove-shaped communication passage 62 constituting a part of the outlet passage 60 is formed on the outer peripheral wall of the stem portion 61a of the valve member 61 in the up-down direction. Furthermore, the outer periphery of the enlarged diameter portion 61 b provided at the upper portion of the valve member 61 protrudes downward, and the downward protruding portion forms a downward valve surface 63. Corresponding to this, a valve seat 64 is provided at the upper end of the tube member 57. The valve member 61 described above is pressed downward by its own weight, and the air pressure of the pressure chamber 65 on the lower side of the enlarged diameter portion 61b is switched to the upper open position against its own weight. In the open position shown in FIG. 5B, a gap in a plan view is formed between the valve surface 63 and the valve seat 64. In addition, when the support rod 2 rises and the valve member 61 is brought into contact with the workpiece W, the valve surface 63 of the valve member 61 is brought into contact with the valve seat 64 of the cylindrical member 57 and the air flow path 58 is blocked. As a result, the pressure in the air flow path 58 rises, and this rising pressure is detected by the pressure switch. As a result, it was confirmed that the valve member 61 rose to a position where it abutted against the lower surface of the workpiece W. In addition, the cylindrical member 57 and the valve member 61 are members that constitute a part of the support rod 2.

The air supply port 59 and the outlet path 60 are connected by an air flow path 58. In this embodiment, the air flow path 58 includes the inclined flow path 66 at the upper right of the housing 1, the spring chamber 15, the slit 5b of the collet 5, the outer peripheral space and the lower end of the support rod 2 Side space, gap 67 formed between the inner peripheral surface of the lower half of the support rod 2 and the outer peripheral surface of the center member 56, the longitudinal groove 68 provided in the operated portion 2a of the support rod 2, and the cylindrical hole of the support rod 2 .

The work support shown in the third embodiment described above operates in the following abnormal state and operates as follows. In the released state shown in FIG. 5A, there is a case where the upper wall 1a of the work support and the support rod 2 are fixed by chips or cutting oil (abnormal state). In this abnormal state, when the work support is locked and driven, when compressed air is supplied from the supply port 32 to the operating chamber 52, the compressed air in the operating chamber 52 resists the urging force of the second spring 36 to raise the second piston 25 . At this time, the support rod 2 is fixed to the upper wall 1a of the housing 1 to restrict the movement in the vertical direction. Next, the engaging portion 70 of the piston rod 26 pushes up the locking portion 71 of the valve member 61. In this way, the flange portion 75 formed at the lower end of the valve member 61 collides with the lower end surface of the tube member 57. By the impact or pressing force of this collision, the fixed state of the upper wall 1a and the support rod 2 is released. Next, the support rod 2 is raised by the spring application force of the entry-exit spring 43. At this time, the pressure of the pressure chamber 65 is increased by the compressed air supplied from the compressed air source through the air flow path 58 to the outlet path 60, and the air pressure of the pressure chamber 65 lifts the valve member 61 upward from the cylindrical member 57. Open the valve. Next, the upper end surface of the valve member 61 abuts on the lower end surface of the work W. Next, the valve seat 64 of the tube member 57 abuts on the valve surface 63 of the valve member 61 to close the valve. At this time, the pressure of the flow path 58 rises, and this rising pressure is detected by a pressure switch (not shown), and thus, it can be reliably detected that the valve member 61 is in contact with the lower surface of the work W. After that, the first piston 12 holds and fixes the support rod 2 at a predetermined height position through the collet 5. Furthermore, the second piston 25 and the piston rod 26 constitute the output member 24.

The points of difference between the fourth embodiment shown in FIGS. 6A and 6B and the above-described first embodiment are as follows. As shown in FIG. 6A, between the flange portion 42 of the piston rod 26 and the full-thread bolt 3, an access spring (urging means) 43 that urges the support rod 2 upward is attached. The access spring 43 is formed by a compression coil spring. Furthermore, as shown in FIG. 6B, when the entry-exit spring 43 is compressed to the bottom, the adjacent windings of the entry-exit spring 43 are in a state of being close to each other. Next, at the lower limit position shown in FIG. 6A, when the support rod 2 is fixed to the fixed state of the housing 1 due to any abnormality, the output member 24 moves from the lower side (base end side) to the upper side (end side) Through this, the output member 24 is pressed from the lower side to the support rod 2 through the advancing spring 43 in the above-mentioned close state, and the fixed state is released.

The above embodiment can be changed as follows. The driving means of the first embodiment described above may be constituted by other pressure fluid supplied to the inlet chamber 31 in addition to the inlet chamber 31 and the compressed air supplied to the inlet chamber 31. The driving means for moving the output member 24 downwards may be an elastic body such as rubber in addition to the illustrated second spring 36, and further may be compressed air or the like.

In addition to the aforementioned plurality of balls 8, it can also be constituted by a cylindrical member having a low friction function.

The switching means 48 of the first embodiment and the fourth embodiment may be any one that switches the operation chamber 13 toward the inlet chamber 31 and the outlet chamber 35. Therefore, there is no hindrance when the outer peripheral surface of the second piston 25 closes all the openings of the communication holes 49, or when the communication holes 49 communicate with both the inlet chamber 31 and the outlet chamber 35 There are obstacles. Furthermore, the switching means 48 is of course not limited to the combination of the opening of the communication hole 49 and the outer peripheral surface of the second piston 25.

Furthermore, the communication hole 49 of the first embodiment may be provided with a throttle passage, and instead of the throttle passage, or in addition, an annular gap between the first cylinder bore 11 and the first piston 12 It is better to set it to a small value. In this case, since the flow resistance of the annular gap or the communication hole 49 becomes large, the pressure increase time and the pressure decrease time of the operation chamber 13 become longer. As a result, the first piston 12 begins to descend and rise slowly. Through the above, it is possible to delay the start of the locking and unlocking of the support rod 2 caused by the first piston 12, and after the piston rod 26 is raised and lowered, the support rod 2 can be reliably locked and unlocked.

In addition, the present invention is not only applicable to the workpiece supporter of the illustrated structure, but may be a workpiece supporter of another structure. Furthermore, it may also be applied to applications different from the workpiece supporter. For example, instead of using the push-pull transmission mechanism of the collet 5, it is considered that an annular gas operating chamber is formed around the outer periphery of the thin meat sleeve, and the support rod is locked by reducing the diameter of the thin meat sleeve by pressure gas.

The aforementioned exit path 60 only needs to communicate the internal space of the support rod 2 to the outside, and of course is not limited to the illustrated structure.

Furthermore, the cylindrical member 57 may be omitted from the support rod 2. In this case, the aforementioned valve member 61 constituting the support rod 2 is directly supported on the support rod 2.

Furthermore, the valve member 61 described above may be omitted from the support rod 2, and the outlet passage 60 having a small diameter may be directly opened on the upper end surface of the support rod 2. In this case, when the upper end surface of the support rod 2 abuts on the workpiece W, the opening of the exit path 60 is blocked, and the exit path 60 is closed.

1: cover 1a: upper wall (end wall) 1b: Lower wall (base end wall) 2: support rod 5: collet 11: cylinder bore 12: 1st piston (piston) 15: Spring room (actuation room) 24: output component 43: In and out spring 70: Engagement Department 71: locking part

[FIG. 1] FIG. 1 is a front cross-sectional view showing a first embodiment of the present invention, showing a released state of a work support. [FIG. 2] FIG. 2 is a front cross-sectional view showing the locked state of the work support, similar to FIG. 1 described above. [FIG. 3] FIG. 3 is a front cross-sectional view showing a state where the second piston of the work supporter pushes up the support rod, similar to FIG. 1. [Fig. 4] Fig. 4 is a diagram similar to Fig. 3 showing a second embodiment of the present invention. [Fig. 5A] Fig. 5A is a front cross-sectional view showing a third embodiment of the present invention, showing a released state of the work support, similar to Fig. 1. [Fig. 5B] Fig. 5B is a front cross-sectional view showing a third embodiment of the present invention, showing a state in which the support rod is pushed on the second piston of the work support, similar to Fig. 3. [FIG. 6A] FIG. 6A is a front cross-sectional view showing a fourth embodiment of the present invention, showing a released state of a work support, similar to FIG. 1. FIG. [FIG. 6B] FIG. 6B is a front cross-sectional view showing a fourth embodiment of the present invention, showing a state in which the support rod is pushed on the second piston of the work support, similar to FIG. 3. FIG.

1: cover

1a: upper wall (end wall)

1b: Lower wall (base end wall)

1c: Carcass part

2: support rod

2a: Operated part

3: Full thread bolt

5: collet

5a: Push the outer surface

5b: slit

6: Transmission equipment

6a: Push the inner and outer surfaces

7: annular push-pull clearance

8: Ball

10: 1st cylinder

11: cylinder bore

12: 1st piston (piston)

13: moving room

14: the first spring

15: Spring room (actuation room)

16: Sealing member

17: Sealing member

19: Upper spring bearing

20: Lower spring bearing

21: 2nd cylinder

22: 2nd cylinder bore

23: Rod hole

24: output component

25: 2nd Piston

25a: Sealing member

26: Piston rod

30: Lower wall

31: Entrance room

32: to the outlet

34: Upper wall

35: Exit room

36: 2nd spring

42: flange part

43: In and out spring

45: Connect the ditch

46: Supply path

48: Switching method

49: connecting hole

70: Engagement Department

71: locking part

T: bed table

Claims (5)

A workpiece supporter with: The support rod (2) is inserted into the end wall (1a) of the housing (1) so that it can move toward the axial end and base end in the housing (1); An annular collet (5), which is embedded around the outer periphery of the aforementioned support rod (2); The piston (12) is a piston (12) inserted into a cylinder bore (11) formed in the casing (1) in the axial direction, and is driven through the collet (5) by driving the piston (12) To lock the aforementioned support rod (2); The output member (24), which is inserted into the base end wall (1b) of the aforementioned casing (1), can move in the axial direction; and Force-applying means, which applies force to separate the support rod (2) from the output member (24); The support rod (2) at the limit position of the base end side is due to any abnormality, and the output member (24) moves from the base end side when being fixed to the fixed state of the cover (1) To the end side, through this, the engaging portion (70) formed on the output member (24) is pressed from the base end side to the engaging portion (71) formed on the support rod (2) to release the fixing status. The workpiece supporter according to claim 1, wherein, The movable stroke (S) from the limit position on the base end side of the output member (24) to the limit position on the end side is set to be higher than the output member (24) from the limit position on the base end side The distance (H) from the engaging portion (70) to the engaging portion (71) of the support rod (2) at the limit position on the base end side is longer. For example, the workpiece supporter of item 1 or 2, where, The urging means is composed of an operating chamber (15) formed on the base end side of the support rod (2), and an operating pressure fluid supplied to the operating chamber (15). For example, the workpiece supporter of item 1 or 2, where, The urging means is constituted by: an access spring (43) installed between the support rod (2) and the output member (24). A workpiece supporter with: The support rod (2) is inserted into the end wall (1a) of the housing (1) so that it can move toward the axial end and base end in the housing (1); An annular collet (5), which is embedded around the outer periphery of the aforementioned support rod (2); The piston (12) is a piston (12) inserted into a cylinder bore (11) formed in the casing (1) in the axial direction, and is driven through the collet (5) by driving the piston (12) To lock the aforementioned support rod (2); The output member (24), which is inserted into the base end wall (1b) of the aforementioned casing (1), can move in the axial direction; and The entry-exit spring (43) is an entry-exit spring (43) installed between the support rod (2) and the output member (24), and urges the support rod (2) away from the output member (24); When the aforementioned entry-exit spring (43) is compressed to the bottom, adjacent windings of the entry-exit spring (43) are in close contact with each other; When the support rod (2) at the limit position on the base end side is fixed to the fixed state of the housing (1) due to any abnormality, the output member (24) moves from the base end side to On the end side, the output member (24) is pressed from the base end side to the support rod (2) through the advancing spring (43) in the tight state to release the fixed state.

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