JPH0631907U - Chuck loosening device - Google Patents

Abstract

(57) [Summary] [Purpose] Automates the loosening work to reduce the burden on the operator and also allows the tool to be stably attached to the tool holder with the same tightening force to prevent the tool from coming off and the chuck to be damaged. An object of the present invention is to provide a chuck loosening device capable of preventing the above and further speeding up the loosening work. [Structure] A fixing portion 1 for fixing a shank 101 of a tool holder 100, and a chuck portion 10 of the tool holder 100.
2 and a loose tightening portion 30 for loosely tightening the loose tightening portion 30.
The fixing means 46 is rotatable and can fix the chuck portion 102, and the driving means 70 for rotating the fixing means 46.
The fixing means 46 is configured to be reciprocally movable along the axial direction of the tool holder 100 fixed to the fixing portion 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chuck loosening device used for attaching / detaching a tool to / from a tool holder used in, for example, a machining center, and more specifically, a chuck loosening device for automatically loosening a chuck part of a tool holder. It is about.

[0002]

[Prior art]

 Conventionally, in machining centers and the like, a tool holder for holding a tool having a straight shank is generally widely used. To attach the tool to the tool holder, insert the shank of the tool into the chuck part of the tool holder, and manually tighten the nut provided on the chuck part via the collet with a hook spanner, etc. The tool was attached to the tool holder. In addition, when the tool is removed from the tool holder, the worker has purposely performed the reverse operation to the above.

[0003]

[Problems to be solved by the device]

 However, in the machining centers used today, there are many types of tools used, and the number of tools mounted on the tool holder and the number of times they are mounted are extremely large. There was a problem that it was a heavy burden on the workers involved.

Further, the tightening force varies due to individual differences among workers, and as a result, the tool may come off due to insufficient tightening, or the chuck may be damaged due to excessive tightening to prevent the tool from coming off. Therefore, there is a problem that the tool cannot be stably attached to the tool holder. Further, since the worker manually loosens and tightens the chuck portion with a hook spanner or the like, there is a problem that the loosening work takes time.

The present invention has been devised in view of such conventional problems. It automates the loosening work to reduce the burden on the operator and stabilizes the tool with the same tightening force. An object of the present invention is to provide a chuck loosening device that can be attached to a machine to prevent the tool from coming off and the chuck part from being damaged, and to further speed up the loosening work.

[0006]

[Means for Solving the Invention]

 In order to achieve the above object, the present invention comprises a fixing portion for fixing a shank of a tool holder and a loose tightening portion for loosely tightening a chuck portion of the tool holder, the loose tightening portion being rotatable and It has a fixing means capable of fixing the chuck part and a driving means for rotating the fixing means, and the fixing means is configured to be reciprocally movable along the axial direction of the tool holder fixed to the fixing part. This is the summary.

[0007]

[Action]

 This invention is configured as described above, and when mounting the tool on the tool holder, after inserting the tool into the chuck part of the tool holder fixed to the fixing part, the chuck part of the tool holder is fixed to the loosening part. The fixing means is fixed, and the driving means is driven and rotated to rotate the fixing means in the tightening direction. The fixing means moves while rotating in the tightening direction along the axial direction of the tool holder fixed to the fixing portion, the chuck portion of the tool holder is tightened, and the tool is gripped by the chuck portion of the tool holder.

When removing the tool from the tool holder, the tool holder with the tool attached is fixed to the fixing portion, the chuck portion of the tool holder is fixed by the fixing means of the loosening portion, and then the driving means is reversed from the above. The fixing means is rotated in a slow direction. Since the fixing means moves while rotating in the loose direction along the axial direction of the tool holder fixed to the fixed part, the chuck part of the tool holder loosens and the tool gripped by the chuck part of the tool holder is gripped. The state is released.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 is a cross-sectional explanatory view showing a main part of a chuck loosening and tightening device according to the present invention, and FIG. 2 is a plan view showing a positional relationship of the chuck loosening and tightening device in FIG. This chuck loosening device comprises a fixing portion 1 for fixing the shank 101 of the tool holder 100 and a loosening portion 30 for loosely tightening the chuck portion 102 of the tool holder 100.

The fixed portion 1 includes a body 3 standing upright on a base (not shown), and a cylindrical hole portion 5 is formed on a horizontal upper end surface of the body 3. A sleeve 9 having a flange portion 7 on the upper end side is fitted into the hole portion 5 with the flange portion 7 protruding, and is fixed to the body 3 by a plurality of bolts 11. The sleeve 9 has a tapered taper surface from the upper end surface of the collar portion 7 in a direction orthogonal to the upper end surface, and has a fitting hole 13 into which the tapered shank 101 of the tool holder 100 fits. ing. A thread groove portion 15 is formed on the outer peripheral surface of the collar portion 7 of the sleeve 9, and a nut 17 is screwed into the thread groove portion 15.

Further, the two key grooves 25 formed on the upper end surface of the collar portion 7 of the sleeve 9 are separated from each other by 180 °, and are formed on the shank collar portion 103 of the tool holder 100 with each other by 180 °. The drive keys 27 that can be fitted into the key groove 105 that reaches the V groove 104 from the end surface of the shank collar 103 are fixed by bolts 29.

On the upper end surface of the nut 17, a claw member 21 having a claw portion 19 whose upper end portion protrudes inward is fixedly provided at a distance of 180 ° from each other. The claw portion 19 is provided with a tapered surface 23 so that the inner tip thereof engages with the slope of the V groove 104 formed on the outer peripheral surface of the shank collar portion 103 of the tool holder 100. Since the claw member 21 engages with the V groove 104 through the key groove 105, the width of the claw member 21 is configured to be narrower than the width of the key groove 105 (drive key 27).

The loosening portion 30 has two guide rods 32 projectingly provided on the upper end surface of the body 3, and these two guide rods 32 are arranged in the axial direction of the tool holder 100 mounted on the fixed portion 1. They are arranged parallel to each other and 180 ° apart from each other as shown in FIG. The upper ends of the two guide rods 32 are connected and supported by a connecting member 35. A slide member 34 is provided movably up and down along the two guide rods 32 via a slide assisting member 33 such as a bearing.

A vertical hole 36 is formed in the center of the slide member 34. A spindle 42 having a gear 40 at its upper end is formed in the hole 36, and a rotary auxiliary sliding member such as a bearing. It is rotatably arranged via 38. Further, a hole portion 44 is formed in the center of the spindle 42 so as to pass through in the vertical direction and into which the chuck portion 102 of the tool holder 100 can be inserted.

At the lower end of the spindle 42, a fixing means 46 capable of fixing the chuck 102 of the tool holder 100 is provided. The fixing means 46 has a pair of brackets 48 fixed to the outer peripheral surface of the lower end portion of the spindle 42 at 180 ° apart from each other. The bracket 48 and the lower end portion of the spindle 42 are horizontally formed. The claw members 50 that can engage with the engaging grooves 107 formed on the outer peripheral surface of the nut 106 of the chuck portion 102 are slidably inserted into the through holes 49 and 43, respectively.

The claw member 50 has a forked claw portion 52 that engages with the engaging groove 107 of the nut 106 of the chuck portion 102 at the inner ends facing each other, and is provided in the through hole 49 of the bracket 48. An elastic member 54 such as a coil spring is constantly urged inwardly facing each other. A notch groove 56 is formed on the outer end portion of the bracket 48 along the through hole 49 from the outer end surface. The notch groove 56 penetrates the claw member 50 and is fixed to the claw member 50. The stopper 58 is engaged so as to restrict the inward biasing of the claw member 50. Reference numeral 60 denotes a knob fixed to the claw member 50 for operating the claw member 50. Therefore, when the knob 60 is rotated by pulling the knob 60 outward to remove the stopper 58 from the notch groove 56, the stopper 58 is engaged with the bifurcated outer end surface of the bracket 48 and the claws facing each other. The chuck portion 102 of the tool holder 100 can be inserted between the claw portions 52 at the tip of the member 50.

Further, the slide member 34 is provided with drive means 70 for driving the spindle 42. The drive means 70 has a fluid pressure motor 72 fixed to the slide member 34 and a drive source (not shown) for driving the fluid pressure motor 72, and the lower end of the rotating shaft 74 of the fluid pressure motor 72. A gear 76, which meshes with the gear 40 at the upper end of the spindle 42, is fixed to the portion.

Reference numeral 80 denotes a cover member which is provided on the upper end of the slide member 34 and covers the gear 40. The cover member 80 has a sensor 78 for detecting the sensor detection piece 77 provided on the upper end of the gear 40. Is provided. This sensor 78 prevents the chuck part 102 from being loosened too much. When the chuck part 102 is loosened, the sensor detection piece 77 is rotated by a predetermined number of revolutions as the spindle 42 rotates. The sensor 78 detects and sends a detection signal to a control device (not shown) to stop the drive of the fluid pressure motor 72.

Although not shown, a constant load is applied to the slide member 34 via a connecting member and a pulley in order to surely stop the slide member 34 at a position where the slide member 34 is always moved and keep the balance. It is preferable to provide a spring or a balance weight. Next, the operation of the present invention having the above structure will be described. First, when the tool T is attached to the tool holder 100, the nut 17 is fixed so that the claw member 21 fixed to the nut 17 overlaps the drive key 27 fixed to the collar portion 7 of the sleeve 9. After turning and setting, the claw member 21 is inserted into the V groove 104 through the key groove 105 of the tool holder 100, and the shank 101 of the tool holder 100 is fitted into the sleeve 9 while the drive key 27 is fitted in the key groove 105. It is fitted in the fitting hole 13 of.

Subsequently, the nut 17 is turned to the right when viewed from above in FIG. 1 (hereinafter, the rotation direction is shown from above in FIG. 1), and the lower part of FIG. The taper surface 23 on the lower side of the claw portion 19 is engaged with the inclined surface of the V groove 104, and the tool holder 100 is fixed to the sleeve 9. After fixing the tool holder 100, the shank portion of the tool T is inserted into the collet 108 of the chuck portion 102 of the tool holder 100. The slide member 34 is moved downward along the guide rod 32 so that the claw portion 52 of the claw member 50 is located at the height position of the engaging groove 107 of the chuck portion 102 (at this time, the stopper 58 is turned off). It is disengaged from the notch groove 56 and engaged with the bifurcated outer end surface of the bracket 48).

The spindle 42 is rotated by hand (at this time, the fluid pressure motor 72 is designed so that the fluid is drained so that it can freely rotate), and the claw portion 52 of the claw member 50 is engaged with the chuck portion 102. After matching with the groove 107, the knob 60 is rotated to engage the stopper 58 with the notch groove 56 and the claw portion 52 of the claw member 50 with the engagement groove 107. Since the claw member 50 is biased inward by the elastic member 54, the claw portion 52 can be firmly engaged in the engagement groove 107.

After the engagement of the claw portion 52, the fluid pressure motor 72 of the driving means 70 is operated. Pressurized fluid such as oil is sent from a drive source (not shown) to the fluid pressure motor 72 to operate the fluid pressure motor 72, and the gear 76 fixed to the rotating shaft 74 rotates leftward. Rotational driving force is transmitted from the gear 76 to the spindle 42 via the gear 40. The spindle 42 is rotated in the right direction, the nut 106 of the tool holder 100 rotates in the right direction, and the collet 108 is tightened to hold the tool T in the tool holder 100. When the pressurized fluid sent from the drive source reaches a predetermined pressure, a pressure switch or the like provided in the fluid circuit or the like operates to turn off the drive source and stop the fluid pressure motor 72. Then, the fluid pressure motor 72 becomes free of fluid again and can freely rotate. Therefore, the tool T can be stably mounted on the tool holder 100 with the same tightening force, and it is possible to prevent the tool T from coming off after mounting and damaging the chuck portion 102 of the tool holder 100. The life of 100 can be improved.

In order to remove the tool holder 100 with the tool T attached from the sleeve 9, the spindle 42 is manually rotated slightly to the left and moved upward (to the engaging groove 107 of the chuck 102). (Loosen the claw portion 52 of the claw member 50 that is firmly engaged in the downward direction) and pull the knobs 60 outward to release the engagement between the claw portion 52 of the claw member 50 and the engagement groove 107. At the same time, the stopper 58 is removed from the notch groove 56. Then, the knob 60 is rotated to engage the stopper 58 with the bifurcated outer end surface of the bracket 48.

Subsequently, the slide member 34 is moved upward, the tool holder 100 inserted in the hole 44 of the spindle 42 is removed from the hole 44, and the nut 17 of the fixed portion 1 is rotated counterclockwise to remove the claw member. After aligning 21 with the key groove 105 of the tool holder 100, the tool holder 100 is removed from the sleeve 9. At this time, the shank 101 of the tool holder 100 bites into the fitting hole 13 of the sleeve 9 and is firmly fixed, but as the nut 17 rotates, the tapered surface 23 on the upper side of the claw portion 19 of the claw member 21 becomes V. Since the upper surface of the groove 104 is brought into contact with and pushed up, the bite into the fitting hole 13 of the shank 101 is easily released.

When removing the tool T from the tool holder 100, the tool holder 100 is mounted in the fitting hole 13 of the sleeve 9 and the claw member 50 of the fixing means 46 is fitted in the engaging groove 107 of the tool holder 100 as described above. After the engagement, the fluid pressure motor 72 may be rotated in the opposite direction to the above and removed. At this time, the sensor 78 detects the sensor detection piece 77 rotated a predetermined number of times to stop the fluid pressure motor 72. Therefore, it is possible to prevent the nut 106 of the chuck portion 102 from being loosened too much.

As described above, the present invention comprises the fixing portion 1 for fixing the shank 101 of the tool holder 100 and the loosely tightening portion 30 for loosely tightening the chuck portion 102 of the tool holder 100. An axial direction of the tool holder 100 having a fixing means 46 that is rotatable and can fix the chuck portion 102, and a driving means 70 that rotates the fixing means 46, and the fixing means 46 is fixed to the fixing portion 1. Since it is configured to be reciprocally movable along the above, the tightening work of the chuck portion 102 of the tool holder 100 can be automated to reduce the burden on the operator and speed up the tightening work. Further, since the tool T is tightened with the same tightening force, the tool T can be stably mounted on the tool holder 100 without the tool T coming off from the tool holder 100, and the chuck portion 102 of the tool holder 100 can be mounted. Since damage to the tool holder is prevented, the life of the tool holder 100 can be improved.

In the above embodiment, the fluid pressure motor 72 is used in the driving means 70 of the chuck loosening device, but instead of the fluid pressure motor 72, an electric torque motor with a reducer or a variable torque setting is possible. A drive device or the like may be used. In that case, it is preferable to provide a torque limiter to prevent the tightening of the chuck portion 102.

Further, as shown in FIG. 4, the claw member 21 of the fixed portion 1 may be provided with a stopper 90 capable of contacting the drive key 27. This facilitates the work of turning the nut 17 and setting the claw member 21 on the drive key 27. When the tool T such as an end mill is held in the middle of the collet 108, a stopper bolt is generally inserted into the collet 108 (the stopper bolt needs to be adjusted according to the length, which is complicated), or a nut. Although the main tightening is performed by temporarily tightening 106 so that the tool T does not drop (temporary tightening work is complicated), a magnet block 91 as shown in FIG. 5 may be used. The magnet block 91 has an outer case 92 made of plastic or the like and an inner case 93 screwed into the inner case 92. The inner case 93 can hold the tool T therein. A magnet piece 94 is arranged. A V-shaped groove 95 for facilitating holding of the tool T is formed on the side surface of the magnet block 91 (inner case 93), and the side surface provided with this groove 95 is used for slip prevention. A rubber plate 96 is attached. By using one or a plurality of such magnet blocks 91 and holding the tool T magnetically attached to the magnet block 91 from the side surface of the nut 106 at the end of the nut 106 of the chuck portion 102, the tool T can be arbitrarily attached to the collet 108. It will be easier to tighten with it set in the position.

Furthermore, in the fixing means 46, the pair of claw members 50 is constantly urged inward by the elastic member 54 so that the claw portions 52 engage with the engagement grooves 107 of the chuck portion 102. However, another method, for example, a fluid pressure cylinder may be provided on the bracket 48, and the engaging groove 107 and the disengageable claw portion 52 may be formed at the inner end of the reciprocating piston rod. The nut 106 of the chuck portion 102 may be fixed by using a structure such as a disc brake.

Further, the shape of the claw portion 52 of the claw member 50 is such that the claw portion 52 engages with the engaging groove 107 of the nut 106 of the chuck portion 102 and the engaging groove 107 is loosened when the chuck portion 102 is loosely tightened. As long as it can be firmly caught on, it is not particularly limited whether it is a square claw shape or a round claw shape, and the present invention is not limited to the embodiment of the above-mentioned embodiment, The present invention can be implemented in modes other than the embodiments.

[0031]

[Effect of device]

 As described above, this invention comprises a fixing part for fixing the shank of the tool holder and a loose tightening part for loosely tightening the chuck part of the tool holder. The loose tightening part is rotatable and the chuck part is Since the fixing means has a fixing means that can be fixed and a driving means that rotates the fixing means, and the fixing means is configured to be capable of reciprocating along the axial direction of the tool holder fixed to the fixing portion, the tool The chuck part of the tool holder in which the tool is inserted can be automatically loosened without human intervention, which has the effect of significantly reducing the burden on the worker engaged in the loosening work.

Further, there is an effect that it is possible to speed up the loosening work on the chuck portion of the tool holder and improve the efficiency of the loosening work. Furthermore, since the chuck part can be tightened with the same tightening force, it is possible to prevent the tool from falling out of the tool holder and to stably attach the tool to the tool holder. This has the effect of preventing damage to the tool holder and extending the life of the tool holder.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing a main part of a chuck loosening device according to the present invention.

FIG. 2 is an explanatory plan view showing the positional relationship of the chuck loosening device according to the present invention.

FIG. 3 is a half sectional view of a tool holder.

FIG. 4 is a front view showing a stopper provided on a claw member of a fixed portion.

FIG. 5 is a cross-sectional view of a magnet block used to hold a tool such as an end mill in the middle of the collet.

[Explanation of symbols]

 1 Fixing Part 30 Loose Tightening Part 46 Fixing Means 70 Driving Means 100 Tool Holder 101 Shank 102 Chuck Part

Claims (1)

[Scope of utility model registration request] 1. A fixing part for fixing a shank of a tool holder, and a loose tightening part for loosely tightening a chuck part of the tool holder, wherein the loose tightening part is rotatable and can fix the chuck part. And a driving means for rotating the fixing means, wherein the fixing means is configured to be reciprocally movable along the axial direction of the tool holder fixed to the fixing portion. Loosening device.