KR101612128B1

KR101612128B1 - Tool magazine of machine tool

Info

Publication number: KR101612128B1
Application number: KR1020090127718A
Authority: KR
Inventors: 유근희
Original assignee: 두산인프라코어 주식회사
Priority date: 2009-12-21
Filing date: 2009-12-21
Publication date: 2016-04-12
Also published as: KR20110071214A

Abstract

The present invention relates to a tool magazine of a machine tool, and particularly to a tool magazine having a structure in which a specific tool can be accurately positioned at a tool changing position in a tool magazine provided with a plurality of tools housed by grippers, The present invention includes a chain 110 on which a plurality of grippers 112 are mounted, a drive / driven sprocket 122/124 coupled to the chain 110 and configured to maintain a predetermined transport path of the chain, ; A position controllable drive motor 120 connected to the drive sprocket 122 to forward / reverse the drive sprocket; And a tool changer 130 which is reciprocally driven toward the tool changer position P which is one of the transfer paths of the chain 110 to load and unload the tool in the gripper 112 that has reached the tool changer position P The drive sprocket 122 is coupled to the chain at a point near the tool change position P in the transfer path of the chain and is coupled to the rotational axis 123 of the drive sprocket A positioning disc 121 which is driven together and includes a plurality of positioning holes 149 arranged along the circumferential direction and a pin which is driven up and down on the disc 121 to be inserted into positioning holes (140) that includes a tool changer (142), and through which a specific gripper can be accurately positioned at a desired position, such as a tool change position (P) have.

Tool magazine, tool exchange device, tool exchange position, positioning means, chain, gripper

Description

[0001] The present invention relates to a tool magazine of a machine tool,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool magazine of a machine tool, and more particularly, to a tool magazine having a structure capable of accurately positioning a specific tool in a tool magazine accommodated by a gripper.

Generally, in a machine tool, a plurality of tools are stored in a tool magazine of a machine tool, and a specific tool is pulled out or stored again by a command of a control unit.

In the tool magazine of the machine tool, a gripper is installed on one side of the chain, the chain is installed on a sprocket and a follower sprocket, and the drive sprocket is driven using a position controllable drive motor, do.

That is, the gripper containing the specific tool is moved toward the tool exchange position to move the tool to the automatic tool changer (ATC) or to store the tool in the empty gripper to be handed over from the automatic tool changer.

The conventional tool magazine 100 will be described in more detail with reference to FIGS. 1 and 2. FIG.

FIG. 1 is an exemplary view for explaining a conventional tool magazine 100, and FIG. 2 is an exemplary view for explaining a configuration for adjusting tension of a chain in a conventional tool magazine.

1 and 2, a tool magazine 100 is provided with a drive motor 20 on one side thereof, a drive sprocket 22 provided on the drive motor, a follower sprocket 22 on the other side of the tool magazine 100, And a chain 10 for holding a predetermined feeding path by the driving sprocket 22 and the driven sprocket 24 is provided.

The above-described driven sprocket 24 may be provided with tension adjusting means 60 for adjusting the tension of the chain 10 described above.

The chain 10 is provided with a plurality of grippers 12 for receiving the tool 16 therein.

A tool exchange position P is provided between the drive sprocket 22 and the above-described driven sprocket 24 so that the tool 16 is drawn out or stored.

That is, by driving the drive motor 20, the chain 10 is moved so that the specific gripper 12 is moved to the tool change position P and positioned.

The tool changer 30 is moved to the tool changer position P and the tool 14 is pulled out of the gripper 12 by the interaction of the tool changer 30 and the gripper 12, The tool is housed.

In addition, in order to prevent problems such as the mounting of individual grippers and the stretching of the chain being conveyed as the tool magazine is used for a long time, the conventional tool magazine is equipped with the tension adjusting means 60 It is common.

The tension adjusting means 60 of Fig. 2 is so constructed that the upper portion of the rotary shaft 25 is fixed to the tool magazine with the lower portion of the rotary shaft 25 of the driven sprocket 24 fixed to the bolt 62, and a washer 64, as shown in Fig. For example, if the tension of the chain 10 is detected to be loosened, the bolt 62 is further tightened so that the rotary shaft 25 is pressed in one direction so that the tension of the chain can be maintained in a proper state .

However, the above-described conventional tool magazine 100 has the following problems.

Since the distance D1 is present between the drive sprocket 22 and the tool exchange position P in which the tool 14 is received and stored and the distance D1 is large as shown in Fig. 1, the drive motor 20 Even if the position controllable servomotor is applied, there is a difficulty that the tool 16, i.e., the gripper housing the tool is accurately transferred to the predetermined position, i.e., the tool exchange position P.

This is because even if the servo motor is properly driven in consideration of the distance between the current position of the specific tool and the tool exchange position P, the position where the drive force acts, that is, the position where the drive sprocket 22 is disposed and the tool exchange position P are distant from each other, errors due to the distances are accumulated.

Further, in order to support a stable exchange of the tool, an additional fixing means (not shown) temporarily holding the corresponding portion of the chain 10 at the opposite side to which the gripper 12 is mounted at the tool changing position P It is also required.

Even when the movement of the chain 10 is desired to be fixed by using the additional fixing means, it takes a long time to drive the fixing means, thereby increasing the overall time required for tool changing.

In addition, the number of links constituting the chain 10 may be increased, an error may be generated by the increased length, and the tension of the chain 10 may be loosened. In order to control the tension of the chain 10, There is a cumbersome problem that the control device 60 must be used frequently.

In addition, since only the upper portion of the rotary shaft 25 is adjusted by the bolts to adjust the tension of the chain, the rotary shaft 25 is inclined in a state where the lower portion is fixed. If the rotary shaft 25 is tilted by the tension control, the follower sprocket 24 itself is inclined and supports the chain 10, which results in a problem that the overall conveying path of the chain itself deviates from the normal state have.

Therefore, the technical problem to be solved by the present invention is to allow the gripper to stop at the correct position when exchanging tools, to make it possible to use the chain without adjusting the tension of the chain even if the chain is stretched, The tool magazine of the machine tool is provided.

The present invention has been made in view of the above problems, and it is an object of the present invention to at least partially solve the problems in the conventional arts. There will be.

According to an aspect of the present invention, there is provided a tool magazine of a machine tool including a chain having a plurality of grippers mounted thereon, a drive / A driven sprocket; A position controllable drive motor connected to the drive sprocket for forward / reverse rotation of the drive sprocket; And a tool changer that is driven to reciprocate toward a tool change position (P), which is one of transfer paths of the chain, to load and unload a tool in the gripper that has reached the tool change position (P) And a plurality of positioning holes which are coupled to the chain at a point near the tool exchange position (P) of the transfer path of the chain and which are coupled to the rotation shaft of the drive sprocket and driven together and arranged in the circumferential direction And further positioning means including a disk and pins which are vertically driven at one point on the disk and are insertable into positioning holes located below.

In addition, the positioning hole may be formed such that when a specific tool reaches the tool exchange position, a specific positioning hole is rotationally transferred to a lower position of the pin so that the pin is inserted into the specific positioning hole, So that the tool can be accurately aligned with the tool exchange position.

That is, the rotational distance between the positioning holes corresponds substantially one to one to the pitch between the grippers mounted on the chain.

Further, the driven sprocket may further include a tension adjusting means for elastically pressing the rotary shaft of the driven sprocket in the upper / lower direction, wherein the tension adjusting means elastically presses the upper / lower portions of the rotary shaft at the same time, have.

The details of other embodiments are included in the detailed description and drawings.

In the tool magazine of the machine tool according to the present invention as described above, the drive sprocket driven by the position controllable drive motor is disposed at a position close to the tool change position P and further includes the positioning means, The gripper can always be moved to the correct position.

In addition, the tool magazine of the machine tool according to the present invention can move the specific gripper to the tool changing position more accurately by using the positioning means even if the chain is slightly increased by long-term use.

In addition, since the tension of the chain is automatically adjusted by the elastic pressing of the tension adjusting means, it is possible to prevent the consumption of time and the like required for manual tension adjustment.

In addition, the present invention has an advantage that conventional problems occurring when the rotation axis is inclined can be prevented by simultaneously applying tension control of the chain at the upper and lower portions of the rotation axis.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings.

Like reference numerals refer to like elements throughout the specification.

Hereinafter, a tool magazine of a machine tool according to the present invention will be described with reference to FIGS. 3 to 6. FIG.

FIG. 3 is an exemplary view for explaining a tool magazine 200 of a machine tool according to an embodiment of the present invention, and FIGS. 4 and 5 illustrate a feature of the present invention around the positioning means 140 of FIG. Sectional view and a perspective view in detail.

4, a tool magazine 200 according to an embodiment of the present invention is provided with a chain 110 on a drive sprocket 122 and a driven sprocket 124, and a gripper 112 is mounted on the chain 110, Respectively.

The chain 110 described above is configured to include a link, a pin, and a chain bush, and the configuration of the chain uses a known technique, and a detailed description thereof will be omitted.

The gripper 112 described above includes a pair of jaws and a spring for applying a restoring force in a direction in which the pair of jaws are pinched and the tool 114 is housed in a pair of jaws. ) Also employs a known technique, and a detailed description thereof will be omitted.

The driving sprocket 122 is provided with a position controllable driving motor 120 to drive the driving sprocket 122 in the forward and reverse directions by the power output from the driving motor 120.

The above-described drive motor 120 may be, for example, a position controllable servomotor.

In addition, the drive sprocket 122 described above is fastened to a link or the like of the chain 110 and moves the chain 110 in a predetermined direction.

The tool changer 130 is reciprocally driven toward a predetermined position in the transfer path of the chain 110, that is, the tool exchange position P, and the tool in the gripper 112 transferred to the position is put in and out.

Further, positioning means 140 may be additionally formed in the drive sprocket 122 to ensure accurate transfer of the gripper.

4 and 5, the positioning means 140 according to an aspect of the present invention includes a plurality of positioning portions 140 arranged in the circumferential direction, which are coupled to the rotation shaft 123 of the drive sprocket 122 and driven together, A positioning disc 121 including a crystal hole 149, and a pin 142 driven up and down to be insertable into the positioning hole.

The pin 142 is accommodated in the cylinder 144 and can be hydraulically operated in accordance with the position control related signal of the driving motor 120. For example, the pin 142 is lowered and inserted into the positioning hole at a specific position by applying hydraulic pressure to both compartments inside the cylinder 144, which is divided vertically around the pin 142, So that the gripper can be accurately positioned at the tool change position. To this end, a hydraulic hose 146 for transmitting hydraulic pressure to both compartments is connected to the cylinder 144.

The tool magazine 200 according to an embodiment of the present invention configured as described above operates as follows.

The drive sprocket 122 moves the chain 110 so that the specific gripper 112 moves to a predetermined position, that is, the tool change position P, when the drive motor 120 outputs power.

At this time, since the drive motor 120 can be position-controlled, the rotation angle of the drive sprocket 122 and the like can be precisely controlled, thereby moving the specific gripper 112 to the tool change position P. [

This is because the distance D2 (see FIG. 3) of the drive sprocket 122 from the tool change position P to the tool change position P is smaller than the conventional distance (D1) (see FIG. 1), this may lead to an advantage that the accumulation of error due to the distance can be reduced. Therefore, it becomes possible to more accurately move the specific gripper 112 to the tool change position P through the control by the drive motor.

Further, the gripper 112 can be fixed at a more accurate position through the positioning means 140 formed on the drive sprocket 122. A reduction gear which is connected to the drive shaft of the drive motor 120 and transmits power to the rotation shaft 123 of the drive sprocket 122 and which is connected to the rotation shaft 123 in a coaxial manner, A positioning hole 149 is formed in the circumferential direction on the positioning disk 121 so that the positioning disk 121 rotates together with the driving of the driving motor 120. [

A bracket 148 for protecting the positioning disc 121 from the outside is interposed between the positioning disc 121 and the cylinder 144. A pin descended from the cylinder 144 is inserted into the bracket 148 Holes corresponding to the pin lowering position of the cylinder 144 so as to be inserted into the positioning holes 148 of the positioning disc 121 through the through-

Actually, since the positioning disc 121 is coaxially coupled to the rotating shaft 123 of the driving sprocket 122, the rotating speed of the positioning disc 121 is substantially coincident with the rotating speed of the driving sprocket 122 .

Since the rotational speed of the positioning disc 121 and the rotational speed of the drive sprocket 122 are substantially the same as each other, that is, one-to-one correspondence, the rotational distance of the positioning hole 149 on the positioning disc 121, The conveying distance of the gripper 112 conveyed by the sprocket 122 corresponds to one-to-one correspondence.

The pin 142 is lowered and inserted into the positioning hole 149 at the time when the gripper 112 reaches the tool exchange position P and this causes the drive sprocket 151, (For example, the tool change position P) by physically stopping the rotation of the gripper 112 by the rotation of the gripper 112. [

The lowering of the pin 142 can be controlled in various manners. In the present invention, the pin 142 is lowered in advance before the positioning hole 149 is accurately positioned under the pin 142, The pin 142 can be smoothly and accurately inserted into the positioning hole 149 as the positioning disc 121 further rotates in a state in which the surface of the positioning disc 121 is pressed.

In this way, the pin 142 is lowered in advance to the surface of the positioning disc 121, so that the potential of the pin 142 to be generated when the pin 142 is inserted into the positioning hole 149 due to the time required for the lowering of the pin Can be prevented.

In the case of FIG. 5, the bracket 148 of FIG. 4 is omitted and gears connected to the rotation shaft 123 of the drive sprocket 122 of the reduction gear, that is, the positioning holes 149 ) Is clearly shown. As such, it is apparent that any gear 121 can be configured as the positioning disc under the condition that the gear 121 is coaxially coupled with the rotation shaft 123 and rotated at the same rotation speed.

Next, Fig. 6 is an exemplary view for explaining a tension adjusting device 160 used in a tool magazine of a machine tool according to another embodiment of the present invention.

6, the tension adjusting means 160 of the present invention is configured such that the upper / lower portion of the rotary shaft 125 of the driven sprocket 124 is fixed to the fixing portion 166 by the bolt 162 and the elastic means 164 And is characterized by a fastened structure. At this time, the bolts 162a / 162b pass through the fixing portion 166 through the elastic means 164a / 164b and are fastened to the rotary shaft 125, unlike the prior art.

Therefore, the tension adjustment process can be automatically performed by the elastic force of the elastic means without requiring any manual operation to adjust the tension. Therefore, the entire process time can be reduced by omitting the time required for manually adjusting the tension.

In an embodiment of the present invention, the resilient means 164a / 164b may comprise, for example, a plurality of leaf springs, which is desirable in that it can provide greater forces compared to conventional coil springs and the like. By arranging a plurality of plate springs between the bolt and the fixed portion, it is possible to elastically press the rotary shaft with a force comparable to the tension of the chain, so that the tension of the chain can be maintained in a proper state.

As described above, the tool magazine 200 according to the embodiment of the present invention drives the drive sprocket 122 by the drive motor 120 that can control the position, so that the gripper 112 mounted on the chain 110 can be replaced The gripper 112 can be precisely moved to the position P and further fixed to the exchange position P by using the additional positioning means 140 coupled to the drive sprocket 122. [

In addition, by providing the tension adjusting means 140 including the elastic means, it is possible to automatically maintain the tension of the chain in an appropriate state without any additional manual operation, and the tilting of the rotary shaft can be prevented by simultaneously applying pressure to the upper and lower portions of the rotary shaft .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be.

It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

The tool magazine of a machine tool according to an embodiment of the present invention can be used in a machine tool which requires storing / mounting various kinds of tools.

1 is an exemplary view for explaining a conventional tool magazine;

2 is an exemplary view showing a configuration for maintaining chain tension in a conventional tool magazine;

3 is an exemplary view for explaining a tool magazine according to an embodiment of the present invention;

Figs. 4 and 5 are a sectional view and a perspective view showing the positioning means shown in Fig. 3 as a center; Fig.

6 is an exemplary view showing a structure for maintaining a chain tension according to another embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS (S)

10, 110: chain 12, 112: gripper

14, 114: tool 20, 120: drive motor

22, 122: drive sprocket 23, 123:

24, 124: a driven sprocket 25, 125:

30, 130: exchange device 60, 160: tension adjusting means

62, 162a, 162b: bolt 64: washer

66, 166: Fixing parts 100, 200: Tool magazine

121: positioning disc 140: positioning means

142: pin (piston) 144: cylinder

146: Hydraulic hose 148: Bracket

164a, 164b: leaf spring 166:

Claims

A chain 110 mounted with a plurality of grippers 112 for receiving respective tools 114 and a drive / driven sprocket 122 (not shown) coupled to the chain 110 and configured to maintain a predetermined feed path / 124);

A position controllable driving motor 120 connected to the driving sprocket 122 to forward / reverse the driving sprocket;

A tool changer 130 which is reciprocally driven toward a tool changer position P which is one of transfer paths of the chain 110 to load and unload a tool in the gripper 112 that has reached the tool changer position P; A tool magazine (200) of a machine tool,

The drive sprocket 122 is coupled to the chain at a point near the tool change position P of the transfer path of the chain,

A positioning disc 121 including a plurality of positioning holes 149 which are coupled to the rotating shaft 123 of the driving sprocket and are driven together and arranged along the circumferential direction, A pin 142 that is inserted into a positioning hole located at a lower portion and is driven by the pin 142, and an inner compartment in which the fluid is divided into upper and lower portions, And a cylinder (144) capable of operating the pin (142) up and down by fluid input and output in accordance with the signal of the drive motor (120) .

The method according to claim 1,

The cylinder 144 is a fluid cylinder 144,

The positioning hole 149 is rotated so that a specific positioning hole is rotated and transferred to a lower position of the pin 142 at a time when the specific tool 114 reaches the tool exchange position P, Wherein a specific tool mounted on the chain (110) is formed to be able to be accurately aligned to the tool change position by being inserted into the hole.

The method according to claim 1,

The driven sprocket 124 further includes a tension adjusting means 160 for elastically pressing the rotary shaft 125 of the driven sprocket in a predetermined direction at an upper portion and a lower portion of the rotary shaft 125, Wherein the tension adjusting means (160) is a direction in which the slack of the chain is solved by elastically pressing the upper / lower portions of the rotary shaft.

The method of claim 3,

The tension adjusting means 160 is characterized in that the upper and lower portions of the rotary shaft 125 of the driven sprocket 124 are fastened to the fixing portion 166 by the bolts 162 and the elastic means 164 Tool magazine of machine tool.

5. The method of claim 4,

Wherein the elastic means (164) comprises a plurality of elastic means (164a / 164b) and is formed of a leaf spring.