JP2014205203A - Tool pot for chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool pot for chain capable of handling tools with different standards without removing a hollow pin from an inner plate and an outer plate, and thereby reducing the number of parts required for replacing a tool with another tool having a different standard, compared with the configuration replacing a whole set of pot.SOLUTION: A tool pot for chain 100 comprises a tool holding unit 120 which is detachable from a hollow pin 110 and is available in a plurality of types corresponding to a tool T with different standards. The external diameter N of the tool holding unit 120 is unified among tool holding units 120A, 120B, 120C corresponding to different standards of a tool T, and the positions of holding means 122, 123 in the axial direction with respect to the diameter of the tool holding unit 120 are different according to the different standards of the tool T. A prescribed portion 128 of a tool holding unit side is matched with a prescribed portion 112 of a hollow pin side so that the tool holding unit 120 is fixed to a prescribed position in the hollow pin 110.

Description

  The present invention relates to a chain tool pot used in an automatic tool changer installed in a machine tool such as a machining center.

2. Description of the Related Art Conventionally, there is known a chain tool pot including a tool holding unit that detachably holds a tool inside a cylindrical hollow pin that alternately connects a pair of inner plates and a pair of outer plates (for example, a patent) Reference 1).
As such conventional chain tool pots, for example, there are chain tool pots 700A to 700C as shown in FIG. 6 (A) to FIG. 6 (C).

Here, FIG. 6A is a plan sectional view showing a conventional chain tool pot 700A capable of holding a MAS standard tool TA, and FIG. 6B is a conventional cross sectional view showing a conventional CAT standard tool TB. FIG. 6 (C) is a plan sectional view showing a conventional chain tool pot 700C capable of holding a DIN standard tool TC.
In this specification, “A” is added at the end of the components of the MAS standard, “B” is added at the end of the components of the CAT standard, and “C” is added at the end of the components of the DIN standard. A description will be given.

The conventional chain tool pots 700A to 700C are tool holders that detachably hold the tools TA to TC inside cylindrical hollow pins 710A to 710C that alternately connect a pair of inner plates C1 and a pair of outer plates C2. Units 720A to 720C were provided.
The inner plate C1 and the outer plate C2 were attached to the outer periphery of the hollow pins 710A to 710C, and were fastened with a fixing ring 750 so as not to come off.
Here, the MAS standard tool TA, the CAT standard tool TB, and the DIN standard tool TC are shown in FIGS. 5A to 5C for reference.

The MAS standard tool TA, the CAT standard tool TB, and the DIN standard tool TC are constituted by pull stud portions PA to PC and shank portions SA to SC, respectively.
The tools TA to TC have different dimensions and shapes for each standard.
The chain tool pots 700A to 700C are provided with tool holding units 720A to 720C having different sizes and shapes for each standard inside hollow pins 710A to 710C having different sizes for each standard, and the respective tool holding units 720A to 720C. Had a steel ball 722 and a coil spring 723 in the through hole 721.

The steel ball 722 is biased toward the center of the diameter of the hollow pins 710A to 710C by the biasing force of the coil spring 723, and the steel ball 722 is configured to sandwich the tools TA to TC.
And distance PA-PC from the edge part of hollow pin 710A-710C to the center of the steel ball 722 was comprised so that it might differ for every specification.

Special floor 2008-36780

  However, since the conventional chain tool pots 700A to 700C described above have a structure in which the tool holding units 720A to 720C and the hollow pins 710A to 710C are relatively fixed by the spring pins 760, only the tool holding units 720A to 720C are used. In addition, it is necessary to replace the hollow pins 710A to 710C and disassemble the chain, so that it is not possible to cope with tools TA to TC of different standards, and there are many parts required for replacement to tools TA to TC of different standards. There was a problem in maintenance such that it is necessary to replace the pot set when the problem or the tool holding units 720A to 720C is damaged.

  Therefore, the present invention solves the problems of the prior art as described above, that is, the object of the present invention is to provide different standards without removing the hollow pins from the inner and outer plates of the chain and disassembling the chain. To provide a tool pot for chains that can be repaired at the minimum necessary for maintenance, etc., by reducing the number of parts required for changing to a tool of a different standard compared to the configuration in which the set of pots is replaced. It is.

  The invention according to claim 1 is a chain tool pot including a tool holding unit that detachably holds a tool inside a cylindrical hollow pin that alternately connects a pair of inner plates and a pair of outer plates. The tool holding unit is detachable with respect to the hollow pin, and includes a clamping means for clamping the tool in a radial direction, and there are a plurality of types corresponding to different standards of the tool. The outer diameter is unified among the tool holding units corresponding to different standards of the tool, and the position of the clamping means in the axial direction with respect to the diameter of the tool holding unit is different for each different standard of the tool, and the tool holding unit The tool holding unit side predetermined portion on the outer periphery of the tool is aligned with the hollow pin side predetermined portion on the inner periphery of the hollow pin, so that the tool holding unit is , By being attached to a predetermined position within said hollow pins, is to solve the aforementioned problems.

  In addition to the structure of the chain tool pot described in claim 1, the invention according to claim 2 includes the tool holding unit and the tool holding unit in a state in which the predetermined position on the tool holding unit side and the predetermined position on the hollow pin side are combined. Since the hollow pin is fastened with a screw inserted from the outer peripheral side of the hollow pin, the above-described problem is further solved.

  In the invention according to claim 3, in addition to the structure of the chain tool pot described in claim 2, the screw is a countersunk screw, and the diameter of the screw insertion hole in the hollow pin is equal to the outer periphery of the hollow pin. By increasing in size toward the side, the above-described problems are further solved.

  In the invention according to claim 4, in addition to the structure of the chain tool pot according to any one of claims 1 to 3, the tool holding unit locks and holds the holding state of the clamping means. A lock state switching bar that can be unlocked and switched, and the protrusion amount of the lock state switching bar protruding from the tool holding unit differs depending on the different standards of the tool, and the protrusion of the lock state switching bar The amount of protrusion from the hollow pin is unified among the tool holding units corresponding to the different standards of the tool, thereby further solving the above-described problem.

  The chain tool pot according to the present invention includes a tool holding unit that detachably holds a tool in a cylindrical hollow pin that alternately connects a pair of inner plates and a pair of outer plates, thereby providing a machining center or the like. In an automatic tool changer installed in a machine tool, it is possible not only to provide a tool with a desired shape by changing the position of the tool holding unit by chain drive, but also to provide the following unique effects: it can.

According to the chain tool pot of the first aspect of the present invention, the tool holding unit is detachable from the hollow pin and includes clamping means for clamping the tool in the radial direction. Correspondingly, there are multiple types, the outer diameter of the tool holding unit is unified among the tool holding units corresponding to different standards of the tool, and the position of the clamping means in the axial direction with respect to the diameter of the tool holding unit is different standards of the tool The tool holding unit is mounted at a predetermined position in the hollow pin, with the predetermined position on the tool holding unit side on the outer periphery of the tool holding unit being aligned with the predetermined position on the hollow pin side on the inner periphery of the hollow pin. Therefore, when using a tool with a standard different from that before the change, remove the tool holding unit before the change from the inside of the hollow pin and comply with the other standard after the change. It is only necessary to attach the tool holding unit to the inside of the hollow pin, and there is no need to replace the pot set including the hollow pin. It can correspond to.
That is, since there is compatibility between tool holding units corresponding to different standards of tools, it is possible to cope with tools of different standards.

Furthermore, since only the tool holding unit is replaced without replacing the hollow pin, it is possible to reduce the number of parts required for replacement with a tool having a different standard as compared with the configuration in which the pot set is replaced.
In addition, if the tool holding unit is damaged, it is not necessary to replace the pot set and only the tool holding unit needs to be replaced. Therefore, repairs such as maintenance can be performed with the minimum necessary.
In other words, since there is no waste of material resources, it is good for the global environment.
Furthermore, since the outer diameter dimension of the tool pot is not changed and the number of parts is not increased, an increase in the size of the automatic tool changer can be prevented.

  According to the chain tool pot of the invention according to claim 2, in addition to the effect of the invention according to claim 1, the tool holding unit in a state in which the predetermined position on the tool holding unit side and the predetermined position on the hollow pin side are combined. And the hollow pin are fastened with a screw inserted from the outer periphery of the hollow pin, so that the tool holding unit can be moved relative to the hollow pin simply by removing the screw, so that only the tool holding unit can be easily replaced. it can.

  According to the chain tool pot of the invention of claim 3, in addition to the effect of the invention of claim 2, the screw is a countersunk screw, and the diameter of the screw insertion hole in the hollow pin is By increasing toward the outer peripheral side, the entrance of the screw insertion hole becomes a so-called countersink tapered shape, and the head of the countersunk screw does not protrude from the outer peripheral surface of the hollow pin, and the outer surface of the hollow pin Since it is flush, it is possible to prevent the head of the countersunk screw from being caught by another object.

  According to the chain tool pot of the invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the tool holding unit locks the holding state of the holding means. And a lock state switching bar that can be unlocked and switched, and the amount of protrusion of the lock state switching bar protruding from the tool holding unit varies depending on different standards of the tool, and from the hollow pin of the protrusion of the lock state switching bar Since the amount of protrusion of the tool is unified among the tool holding units corresponding to different standards of the tool, the lock state switching bar protrudes from the hollow pin even if the tool holding unit of any standard is attached to the hollow pin. Since the amount is the same, the holding state of the clamping means is the same regardless of whether the tool holding unit of any standard is attached to the hollow pin. It is possible to the switching of the lock and unlock.

The schematic perspective view of the tool pot for chains which is an Example of this invention. The partial cross section top view of the tool pot for chains which is an Example of this invention. (A) is the side view seen from the code | symbol 3A shown in FIG. 2, (B) is the side view seen from the code | symbol 3B shown in FIG. (A) is a sectional plan view when a tool holding unit corresponding to a MAS standard tool is attached, (B) is a sectional plan view when a tool holding unit corresponding to a CAT standard tool is attached, and (C) is Sectional top view at the time of attaching the tool holding unit corresponding to the tool of DIN specification. (A) is a partial sectional plan view showing a MAS standard tool, (B) is a partial sectional plan view showing a CAT standard tool, and (C) is a partial sectional plan view showing a DIN standard tool. (A) is a plan sectional view showing a conventional chain tool pot capable of holding a MAS standard tool, (B) is a plan sectional view showing a conventional chain tool pot capable of holding a CAT standard tool, (C) is a plane sectional view showing a conventional tool pot for chains that can hold a DIN standard tool.

  The present invention provides a tool holder for a chain including a tool holding unit that detachably holds a tool inside a cylindrical hollow pin that alternately connects a pair of inner plates and a pair of outer plates. It is detachable from the hollow pin, has clamping means to clamp the tool in the radial direction, and has multiple types corresponding to different tool standards, and the tool holding unit's outer diameter supports different tool standards The position of the clamping means in the axial direction with respect to the diameter of the tool holding unit is different for each different standard of the tool, and the predetermined position on the tool holding unit side on the outer periphery of the tool holding unit is The tool holding unit is attached to a predetermined position in the hollow pin in combination with a predetermined position on the inner side of the hollow pin. The low pin is removed from the inner and outer plates of the chain to support different standard tools without disassembling the chain, and the number of parts required for changing to a different standard tool compared to the configuration where the pot set is replaced. The specific embodiment may be any as long as it can be reduced and repairs such as maintenance can be performed with the minimum necessary.

For example, the clamping means may be such that the ball is pressed against and abutted against the shank portion of the tool to hold the tool, or the gripping claw or the outer periphery of the pull stud portion at the tip of the tool shank portion is held. You may hold | maintain a tool by pressing and contacting a ball | bowl.
Further, it is possible to provide a lock mechanism that can lock and release the holding state of the clamping means.

Below, the tool pot 100 for chains which is an Example of this invention is demonstrated based on FIG. 1 thru | or FIG.
As shown in FIGS. 1 to 3, a chain tool pot 100 according to an embodiment of the present invention has a tool in a cylindrical hollow pin 110 that alternately connects a pair of inner plates C1 and a pair of outer plates C2. A tool holding unit 120 that detachably holds T is provided.

Specifically, the chain C includes a pair of inner plates C1 spaced apart in the left-right width direction with respect to the longitudinal direction of the chain, a pair of outer plates C2 disposed on the left and right outer sides of the pair of inner plates C1, a hollow pin 110, have.
Both sides of the hollow pin 110 are inserted into the insertion hole C1a of the inner plate C1 and the insertion hole C2a of the outer plate C2, and the fixing ring 150 is attached to the fixing ring groove 114.
The inner plate C1 and the outer plate C2 are positioned between the outer peripheral step 113 of the hollow pin 110 and the fixing ring 150 in the left-right width direction, and at least one of the inner plate C1 and the outer plate C2 is swingably attached to the hollow pin 110.

Furthermore, the tool holding unit 120 includes clamping means for clamping the tool T in the radial direction.
As an example, the clamping means includes a steel ball 122 and a first coil spring 123.
The steel ball 122 and the first coil spring 123 are disposed inside the through hole 121 of the tool holding unit 120, and the steel ball 122 is urged toward the radial center of the tool holding unit 120 by the first coil spring 123. Yes.
Here, the diameter of the through hole 121 is provided so as to be smaller than the diameter of the steel ball 122 at the center side end in the radial direction of the tool holding unit 120.

Further, a sleeve-like cover 127 having a cylindrical shape is disposed on the outer peripheral side of the tool holding unit 120 so that the first coil spring 123 does not jump out of the through hole 121 by covering the through hole 121. Yes.
When the tool T is put into the chain tool pot 100, the large-diameter portion on the tip side of the pull stud portion P (PA to PC) of the tool T moves the steel ball 122 against the urging force of the first coil spring 123. .
When the large-diameter portion of the pull stud portion P (PA to PC) passes and the small-diameter portion opposes, the steel ball 122 moves to the center side in the radial direction of the tool holding unit 120 by the urging force of the first coil spring 123. The small diameter part of the pull stud part P (PA-PC) is clamped.

On the other hand, when the tool T is taken out from the chain tool pot 100, the large-diameter portion of the tip end side of the pull stud portion P (PA to PC) of the tool T resists the urging force of the first coil spring 123 to cause the steel ball 122 to move. Move.
And if the large diameter part of the front end side of the pull stud part P (PA-PC) passes, the clamping state in which the tool holding unit 120 clamped the tool T will be cancelled | released.
In the present embodiment, four steel balls 122 are provided, but three or more steel balls 122 may be used.
Further, a taper sleeve 140 that contacts the shank portion S (SA to SC) of the tool T is disposed on the opposite side of the hollow pin 110 from the side where the tool holding unit 120 is disposed.

Further, the tool holding unit 120 is detachable from the hollow pin 110.
Further, as shown in FIGS. 4A to 4C, there are a plurality of types of tool holding units 120A to 120C corresponding to different standards of the tools TA to TC.
For example, for reference, there are three types: a MAS standard tool TA in FIG. 5A, a CAT (ANSI) standard tool TB in FIG. 5B, and a DIN standard tool TC in FIG. 5C.

In this embodiment, “A” is required at the end of the constituent elements of the MAS standard, “B” is required at the end of the constituent elements of the CAT (ANSI) standard, and “C” is required at the end of the constituent elements of the DIN standard. It attaches | subjects and demonstrates according to.
In the present embodiment, the tool holding unit 120A corresponding to the MAS standard of FIG. 4A and the tool holding unit corresponding to the CAT (ANSI) standard of FIG. 4B according to the three standards of the tools TA to TC. There are three types of tool holding units 120C corresponding to the DIN standard of 120B and FIG.

The outer diameters LA to LC of the tool holding units 120A to 120C are unified among the tool holding units 120A to 120C corresponding to different standards of the tools TA to TC.
On the other hand, the inner diameters MA to MC of the tool holding units 120A to 120C are different as an example between the tool holding units 120A to 120C corresponding to different standards of the tools TA to TC.

Furthermore, the position of the steel ball 122 which is the clamping means in the axial direction with respect to the diameters of the tool holding units 120A to 120C is different for different standards of the tools TA to TC.
Further, the end portion 128 that is a predetermined position on the tool holding unit side on the outer periphery of the tool holding units 120 </ b> A to 120 </ b> C is aligned with the inner peripheral step portion 112 that is a predetermined position on the hollow pin side on the inner periphery of the hollow pin 110. Units 120 </ b> A to 120 </ b> C are attached to predetermined positions in the hollow pin 110.

Accordingly, as shown in FIGS. 4A to 4C, the distances PA to PC from the ends of the hollow pins 110 </ b> A to 110 </ b> C to the center of the steel ball 122 are different for each standard as in the conventional configuration. Configured.
With this as a premise, when using, for example, a tool TB of a standard different from that before the change, for example, the tool holding unit 120A before the change is removed from the inside of the hollow pin 110, for example, according to another standard after the change It is only necessary to attach 120B to the inside of the hollow pin 110, and it is not necessary to replace the pot set including the hollow pin 110.
That is, there is compatibility between the tool holding units 120A to 120C corresponding to different standards of the tools TA to TC.
Furthermore, only the tool holding units 120 </ b> A to 120 </ b> C are replaced without replacing the hollow pin 110.
Further, if the tool holding units 120A to 120C are damaged, it is not necessary to replace the set of pots, and only the tool holding units 120A to 120C may be replaced.
That is, material resources are not wasted.
Further, the outer diameter of the chain tool pot 100 is not changed and the number of parts is not increased.

Further, in this embodiment, the tool holding units 120A to 120C and the hollow pin 110 are in a state where the end portion 128 which is a predetermined position on the tool holding unit side and the inner peripheral step portion 112 which is a predetermined position on the hollow pin side are combined. It is fastened with a countersunk screw 130 which is an example of a screw inserted from the outer peripheral side of the hollow pin 110.
As a result, the tool holding units 120 </ b> A to 120 </ b> C can move relative to the hollow pin 110 simply by removing the countersunk screw 130.

In addition, the diameter N of the screw insertion hole 111 in the hollow pin 110 is increased toward the outer peripheral side of the hollow pin 110.
As a result, the entrance of the screw insertion hole 111 becomes a so-called tapering tapered shape, and the head of the countersunk screw 130 is flush with the outer peripheral surface of the hollow pin 110 without protruding from the outer peripheral surface of the hollow pin 110.

Furthermore, in this embodiment, a lock mechanism is provided that can lock and release the holding state of the clamping means.
Specifically, the lock state switching bar 125 and the second coil spring 126 are disposed in the holes 124 of the tool holding units 120A to 120C.

And the bar protrusion part 125a which is a part of the lock state switching bar 125 protrudes from the hole 124 of the tool holding units 120A to 120C, and the lock state switching bar 125 is moved by the urging force of the second coil spring 126. It is biased in the protruding direction.
In a state where nothing is in contact with the bar protruding portion 125a, the large diameter portion 125b of the lock state switching bar 125 comes into contact with one steel ball 122, and the steel ball 122 does not move.
That is, it is locked while being held by the clamping means.

On the other hand, when a member (not shown) abuts against the bar protrusion 125 a and pushes the lock state switching bar 125 against the urging force of the second coil spring 126, the large diameter portion 125 b of the lock state switching bar 125 passes through the through hole 121. The small diameter portion 125 c of the lock state switching bar 125 faces the through hole 121.
Then, one steel ball 122 can move freely in the through hole 121 to the outer peripheral side of the tool holding units 120A to 120C.
That is, the lock is released.

Further, the protruding amount of the bar protruding portion 125a, which is the protruding portion of the lock state switching bar 125 protruding from the tool holding units 120A to 120C, is configured to be different for different standards of the tools TA to TC.
Furthermore, the protrusion amount of the bar protrusion 125a of the lock state switching bar 125 from the hollow pin 110 is unified among the tool holding units 120A to 120C corresponding to different standards of the tools TA to TC.
Thereby, even if it is a case where the tool holding units 120A-120C of any specification are attached to the hollow pin 110, the protrusion amount from the hollow pin 110 of the lock state switching bar 125 is the same.

  The chain tool pot 100 according to the embodiment of the present invention thus obtained is sandwiched so that the tool holding units 120A to 120C can be attached to and detached from the hollow pin 110 and the tools TA to TC are sandwiched in the radial direction. There are a steel ball 122 and a first coil spring 123 as means, and there are a plurality of types corresponding to different standards of the tools TA to TC, and the outer diameters LA to LC of the tool holding units 120A to 120C are the tools TA to TC. Are unified among the tool holding units 120A to 120C corresponding to different standards, and the positions of the steel balls 122 and the first coil springs 123 in the axial direction with respect to the diameters of the tool holding units 120A to 120C are different for different standards of the tools TA to TC. The end part which is a predetermined place on the tool holding unit side on the outer periphery of the tool holding units 120A to 120C 28 is aligned with the inner peripheral step 112 that is a predetermined location on the hollow pin side in the inner periphery of the hollow pin 110, and the tool holding units 120 </ b> A to 120 </ b> C are attached at predetermined positions in the hollow pin 110, thereby Is removed from the inner plate C1 and the outer plate C2 of the chain C, and the chain C can be disassembled without disassembling the tool TA to TC of different standards. The number of parts required for replacement can be reduced, and maintenance and other repairs can be carried out with the minimum necessary, preventing an increase in the size of the automatic tool changer.

Further, the tool holding units 120A to 120C and the hollow pin 110 are arranged on the outer peripheral side of the hollow pin 110 in a state in which the end portion 128 that is a predetermined position on the tool holding unit side and the inner peripheral step portion 112 that is a predetermined position on the hollow pin side are combined. Only the tool holding units 120 </ b> A to 120 </ b> C can be easily replaced.
Further, the screw is a countersunk screw 130, and the diameter N of the screw insertion hole 111 in the hollow pin 110 increases toward the outer peripheral side of the hollow pin 110. It can be prevented from being caught on.

  Furthermore, the tool holding units 120A to 120C are provided with a lock state switching bar 125 that can lock and release the holding state of the clamping means, and are protruding portions of the lock state switching bar 125 protruding from the tool holding units 120A to 120C. The protruding amount of the bar protruding portion 125a varies depending on different standards of the tools TA to TC, and the protruding amount of the bar protruding portion 125a of the lock state switching bar 125 from the hollow pin 110 corresponds to different standards of the tools TA to TC. Since the tool holding units 120A to 120C are unified, the holding state by the steel ball 122 and the first coil spring 123 is the same even when any standard tool holding unit 120A to 120C is attached to the hollow pin 110. Can be switched between lock and unlock Such as, the effect is enormous.

100, 700 ... Chain tool pots 110, 710 ... Hollow pins 111 ... Screw insertion holes 112 ... Inner peripheral step part 113 ... Outer peripheral step part 114 ... Fixing ring groove parts 120, 720 ... Tool holding units 121, 721 ... Through holes 122, 722 ... Steel balls (clamping means)
123, 723 (first) coil spring (clamping means)
124 ... Hole 125 ... Lock state switching bar 125a ... Bar protrusion 125b ... Large diameter part 125c ... Small diameter part 126 ... Second coil spring 127 ... Sleeve-like cover 128 ··· (Tool holding unit) end 130 · flat head screw 140 · · · taper sleeves 150 and 750 · · · fixing ring 760 · · · spring pin C · · · chain C1 · · · inner plate C1a · · · Insertion hole C2 ... Outer plate C2a ... Insertion hole L ... Outer diameter M (of the tool holding unit) ... Inner diameter N (of the tool holding unit) ... Diameter P (of the screw insertion hole) .... Distance T from the end of the hollow pin to the center of the steel ball ... Tool P ... Pull stud part S ... Shank part

Claims (4)

In a chain tool pot provided with a tool holding unit that detachably holds a tool inside a cylindrical hollow pin that alternately connects a pair of inner plates and a pair of outer plates,
The tool holding unit is detachable with respect to the hollow pin, includes a clamping means for clamping the tool in a radial direction, and there are a plurality of types corresponding to different standards of the tool,
The outer diameter of the tool holding unit is unified among the tool holding units corresponding to different standards of the tool, and the position of the clamping means in the axial direction with respect to the diameter of the tool holding unit is different for each different standard of the tool. ,
The tool holding unit side predetermined portion on the outer periphery of the tool holding unit is aligned with the hollow pin side predetermined portion on the inner periphery of the hollow pin, and the tool holding unit is attached to a predetermined position in the hollow pin. Tool pot for chains characterized by   The tool holding unit and the hollow pin are fastened with a screw inserted from the outer peripheral side of the hollow pin in a state where the predetermined position on the tool holding unit side and the predetermined position on the hollow pin side are aligned. The tool pot for chains according to 1.   The chain tool pot according to claim 2, wherein the screw is a countersunk screw, and a diameter of a screw insertion hole in the hollow pin increases toward an outer peripheral side of the hollow pin.   The tool holding unit includes a lock state switching bar capable of locking and unlocking the holding state of the clamping means, and the protruding amount of the protruding portion of the lock state switching bar protruding from the tool holding unit is different from that of the tool. The method according to any one of claims 1 to 3, wherein the protrusion amount of the protrusion of the lock state switching bar from the hollow pin is unified among tool holding units corresponding to different standards of the tool, as well as different for each standard. The tool pot for chains as described in any one of 3.

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