JP2003080428A - Tool change device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic tool change device furnished with an arm mechanism to carry out change of tools by holding and rotating the tools to enable the efficient tool change. SOLUTION: This tool change device constitutes its characteristic feature of furnishing clamp bars 5, 6 one ends of which are energized toward centers of the bars so as to make contact with surfaces of the bars accordingly when they slide along the bars of a sliding cylinder, storing other ends of the clamp bars 5, 6 in a tool holding arm 1 when the one ends of the clamp bars 5, 6 are at a position of the first width of the fixed bar and holding the tool by the other ends and the inner peripheral surface by projecting the other ends toward the tool holding parts 9, 10 when the one ends of the clamp bars 5, 6 are at a position of the second width of the bars.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
Arm mechanism that exchanges tools by rotating
The present invention relates to an automatic tool changing device provided. 2. Description of the Related Art Machine tools such as machining centers (hereinafter referred to as "machine tools").
(Hereinafter referred to simply as "machine tool" in this specification)
Secure the tool to the dollar and rotate the tool with the spindle
Workpiece is moved by numerical control while moving
I do. Generally, the shape to be processed is complicated,
Need to change tools. Therefore, for each processing step
Then, the tool fixed to the spindle is replaced. Two
The total machining time is shorter because machining is not possible when changing tools
How fast and efficient the tool change is
Is important for machine tools. Therefore, conventionally
For machine tools, automatic tool changers (hereinafter ATC)
) Is provided, and tool exchange is performed by this ATC.
I went. Fig. 6 shows the machine tool
FIG. 3 is a diagram showing a spindle unit and an ATC part. Machine tool
Spindle holding tool 25 for processing
A head 20 is provided on the headstock 30. The headstock 30 is
And is movable with respect to the bed 31.
is there. The headstock 30 is shown in FIG. 6 when changing tools.
As described above, the bed 31 stops at a predetermined position. Headstock 3
There is a tool to be replaced on the bed 31 where 0 stops
Tool magazine 21 holding and holding 26 is fixed
Have been. In this predetermined position where the tool change takes place
Is the center of the spindle 20 and the center of the tool magazine 21
The line connecting to is horizontal. That is, the spindle
The center of the tool magazine 20 and the center of the tool magazine 21
It is almost the same height. In addition, tool 25 is attached
Tool to be replaced with the surface 20a of the spindle 20
Surface 21 of tool magazine 21 to which tool 26 is attached
a are substantially in the same plane. Spindle 20 and toolma
At the center of each of the magazines 21 is a tool 25 and
Tool holes 2 for holding tools 26 respectively
0b and the tool hole 21b are arranged, and the tool
Tool holder 25a at the root of 25 and the root of tool 26
And the tool holder 26a. [0003] The surface 20a of the spindle 20 and the tool magazine
The bed 31 on the side facing the surface 21a of the
Automatic tool changer unit with internal drive
ATC unit 17 is attached. AT
From the C unit 17, the spindle 20 and tool tool
On the line connecting the magazines 21 and the spindle 20
ATC unit exits almost toward the center of the magazine 21
A force axis 11 extends. ATC unit output shaft 11
A tool holding arm 40 is attached to the end. Tsu
The arm holding arm 40 is located on the spindle 20 side around the rod.
Arm extending to both sides of the tool magazine 21 and the tool magazine 21 side
It is. Tool holding parts at both ends of the tool holding arm 40
41 and a tool holding part 42. ATC unit
G on the extension of the direction in which the output shaft 11 extends, and
The pin holder is located almost at the center of the dollar 20 and the tool magazine 21
A plate 22 is provided. Pin holding plate 22
Is the surface 20a of the spindle 20 and the surface of the tool magazine 21
The surface 22a is substantially in the same plane as the surface 21a.
It is fixed to a part of the bed 31 like Lumagazin 21
I have. ATC unit output shaft 11 is tool holding arm 4
0 is far enough from the position where it contacts the pin holding plate 22
Between the ATC unit
Rotates the tool holding arm 40 around the center axis of the output shaft 11
can do. FIG. 7 is a sectional view of a conventional tool holding arm 40.
FIG. Tool holding arm 40 is almost centered
Attached to the ATC unit output shaft 11 by fasteners
ing. Tool holding arm 40 is ATC unit output shaft
Direction from the center of 11 to the ATC unit output shaft 11
Extending toward both ends. Both sides of the tool holding arm 40
A tool holding part 41 and a tool holding part 42 are provided at the end of the end.
Provided. Tool holding part 41 and tool holding part 42
Is the tool hole at the root of the tool 25 or 26.
Inner circumferences 41a and 4 corresponding to the circular shape of the cross section of the rudder portion
2a. The inner circumference 41a and the inner circumference 42a are substantially
It fits in the shape of a semicircle, and a part of the circle is
Missing as mouth 42b. ATC unit output shaft 11
And the distance from the center of the
From the center of the unit output shaft 11 to the center position of the inner circumference 42a
The distance at is almost equal. Opening 41b and opening
42b is the output shaft of the ATC unit when the tool holding arm 40 is
To a positional relationship that results in a point-symmetrical shape with the center at 11.
Are located. [0005] Inside the tool holding arm 40, an ATC
Center position of inner circumference 41a through the center of unit output shaft 11
A slight angle with respect to a line connecting the position and the center position of the inner circumference 42a.
A line through the center of the ATC unit output shaft 11 with a degree
Along the top, bearing housing 43 and bearing housing
The ring 44 is a tool holding part 41 and a tool holding part, respectively.
It is drilled from the 42 side. Bearing housing 43 and
And a bar-shaped clamp bar 45 and a clamp
The pull bar 46 is inserted. Clamp bar 45 and
Of the bearing housing 43 and the clamp bar 46
And part of the part inserted in the bearing housing 44
Has a spring 47 and a spring 48 fitted therein.
You. One ends of the springs 47 and 48 are bearings
Other ends on the side of the housing 43 and the bearing housing 44
Is attached to clamp bar 45 and clamp bar 46
Have been. Spring 47 and spring 48
Connect the lamp bar 45 and the clamp bar 46 to the ATC unit.
So that it is urged outward from the center of the output shaft 11.
Is attached. Clamp bar 45 and clamp bar
Of the tool holder 41 and the tool
Openings 41b and 42b of the screw holder 42
It protrudes inside. Protruding end clamp
Each of the bar 45 and the clamp bar 46 has an opening 4
1b and an inclined surface 45a extending from the opening 42b;
An inclined surface 46a is provided. Inclined surface 45a and inclined
The tool holding portion 41 and the tool holding portion
Another inclined surface 45b and an inclined surface 46b are provided on the holding portion 42 side.
Have been killed. Further, the tool holding arm 40 has an AT
Clamp pin 49 and parallel to the axis of C unit output shaft 11
And the clamp pin 50
45 and a lock mechanism for the clamp bar 46.
You. Next, referring to FIG. 6 and FIGS.
Next, the operation of the conventional ATC will be described. First, two
In the state in which the tool is not replaced, it is shown in a horizontal state in FIG.
The tool holding arm 40 is in a vertical state. FIG.
Is in this state, that is, the ATC unit 17
When the knit output shaft 11 is extended and the tool holding arm 40 is
Clamp pin 49 and clamp pin 50
Tool holding arm in contact with the plate
FIG. 4 is a longitudinal sectional view of a portion of a drum 40. Clamp pin 49
And the clamp pin 50 is provided on the surface of the tool holding arm 40.
With one end projecting vertically from the
The ATC unit is bored in the
Holes 51 and 52
Spring 53 and spring 54
It is biased in the direction of the rate 22. Tool holding arm
The side of the clamp pin 49 and the clamp pin 50 in 40
The lock 49b and the lock 50b protrude from the surface.
You. As shown in FIG.
Pin 49 and the clamp pin 50
2 and the clamp pin 49 and the clamp
Pupin 50 is pushed into tool holding arm 40
The clamp bar 45 and the clamp bar 46
ATC unit against ring 47 and spring 48
It is in a state where it can move in the direction of the output shaft 11. Tool holding
A clamp pin 49 and a clamp are provided inside the arm 40.
Lock 49b and lock 5 when pin 50 is rebuilt
0b and the gaps 4a and 4 are sufficient to retract
0b is prepared (see FIG. 10).
Between the gap 49a and the lock 49b.
It is in a state of being retracted in each of the gaps 40b. Subsequently, when exchanging the tool, the
The surface 49a of the pump pin 49 and the surface 5 of the clamp pin 50
0a is in contact with the surface 22a of the pin holding plate 22.
That is, the clamp pin 49 and the clamp pin 50
Is pressed into the tool holding arm 40
It is. As described above, in this state, the tool holding arm 40
Is in a vertical state. From here, the opening 41b and the opening 4
2b is ATC in the direction toward tool 25 and tool 26
When the unit output shaft 11 is rotated, the opening 41b and the opening
Each of the ports 42b is attached to a spindle
Attached to tool 25 and tool magazine
Approach the tool 26. ATC unit output shaft from here
11 rotates, the tool 25 tilts the clamp bar 45.
The tool 26 is mounted on the inclined surface 45a of the clamp bar 46.
6a. ATC unit output shaft
11 is rotated, that of the inclined surface 45a and the inclined surface 46a.
Each is pressed by the tool 25 and the tool 26,
The ramp bar 45 and the clamp bar 46 are used for the spring 4
Output shaft against ATC unit 7 and spring 48
11 slides toward the center. At this time, clamp pin 4
9 and the clamp pin 50 of each lock 49b and
And 50b are retracted in gaps 40a and 40b.
Therefore, the clamp bar 45 and the clamp bar 46
Can slide as it is pushed by the tool 25 and tool 26
It is. The clamp bar 45 and the clamp bar 46
FIG. 9 shows the state of sliding most toward the ATC unit output shaft 11 side.
This is the state shown in FIG. The tool 25 and the tool 26 hold the tool.
Clamp bar 45 when fully seated in sections 41 and 42
And the clamp bar 46 is provided with a spring 47 and a spring.
Away from the ATC unit output shaft 11 with the restoring force of the ring 48
Return to In this state, the tool 25 holds the tool.
Inner circumference 41a of portion 41 and inclined surface 45b of clamp bar 45
The tool 26 is fixed by the tool holding portion 42
And the inclined surface 46b of the clamp bar 46
Fixed. From here, pin the ATC unit output shaft 11
ATC unit 1 so that it separates from holding plate 22
7 and the clamp pin 49 and the clamp pin
The tool 50 projects from the tool holding arm 40,
Clan evacuated to gaps 40a and 40b
Lock 49b of the pin 49 and the lock pin 50 of the clamp pin 50.
The clamp 50b is a clamp bar 45 and a clamp bar 46.
Lock 45c and lock 46c
45c and the lock 46c to come into the state of FIG.
You. The tool 25 and the tool 26
Removed from spindle 20 and tool magazine 21 respectively
Be taken away. From here, the ATC unit output shaft 11 is further
When the tool 26 is rotated 180 degrees in the same direction, the tool 26
The tool 25 moves to the tool magazine 21 side
You. Here, ATC unit output from ATC unit 17
When the shaft 11 is extended again, the tool 26
In the tool hole 20b, the tool magazine is
Inserted into the tool hole 21b of the gin 21
At the same time, the clamp pins 49 and 50
In the tool holding arm 40 by the holding plate 22
It is pushed again. As mentioned above, in this state
Locking of the pin 49 and the clamp pin 50
49b and the lock 50b are the gap 40a and the gap
40b. Here, the tool 26 is spun
And fix the tool 25 with the tool magazine 21
Fix inside. Here, the ATC unit output shaft 11 is reversed.
When rotated 90 degrees in the direction, tool 26 and tool 25
Is in contact with the inclined surface 45b and the inclined surface 46b,
The clamp bar 45 and the clamp bar 46
Push down to the knit output shaft 11 side. ATC unit output
When the rotation of the shaft 11 is completed, the tool 26 and the tool
25 is from inside the tool holding part 41 and the tool holding part 42
To be released. This completes the tool change. [0010] The ATC unit
Tool change is fast and efficient by holding the tool with strong force
It is necessary to exchange the tools in a regular manner. Therefore,
The conventional tool changer has the following problems. (1) As described above, the tool holding arm 40
When the lock is completed in holding the
The knit output shaft 11 starts contracting in the ATC unit 17
Clamp pin 49 and clamp pin 50
This is the stage away from the plate 22. But the tools
Inserting / removing 25 into / from spindle 20 is a pin holding plate
22 and start with the most
In the initial state required, the lock has not been completed yet.
You. That is, in the conventional ATC, the holding of the tool 25 is
Clamp bar 45 of tool holding arm 40 and clamp
The spring 47 and the sp
The resilience of the ring 48 must be relied on. But the craft
If chips from the machine are scattered or cutting oil solidifies,
Tool only with the restoring force of the ring 47 and the spring 48
It is difficult to hold the clamp bar 45 and clamp
The malfunction of the bar 46 has occurred. (2) In the conventional device, the ATC unit output shaft 1
Clamp to tool 25 and tool 26 by one rotation
When the bar 45 and the clamp bar 46 come into contact with each other,
To slide against the spring 47 and the spring 48
, The tools 25 and 26
The clamp bar 45 and the clamp bar 46
When the tool 25 and tool 26
The spring 47 and the restoring force of the spring 48
When the pull bar 45 and the clamp bar 46 return,
There was a problem generating sound. [0011] According to the present invention, a tool tool is provided.
Tool with an inner peripheral surface corresponding to the cross-sectional shape of the tool holder
Change with a tool holding arm with a tool holding part
An apparatus, wherein the tool changer includes a first width portion.
A fixed width camshaft having a second width portion;
And a through hole on the side, and fixed to the tool holding arm.
A fixed hollow sliding cylinder, and penetrating through the through-hole of the sliding cylinder.
And a clamp bar slidable in the tool holding arm.
The slide cylinder has the clamp camshaft in the hollow portion.
The clamp camshaft is arranged so as to be inserted.
The clamp bar is movable along the
One end of the bar abuts the surface of the clamp camshaft
Urged towards the center of the clamp camshaft
And slides along the clamp cam shaft of the sliding cylinder.
Moving along the clamp camshaft accordingly
Movable, the one end of the clamp bar being the first
When in the width position, the other end of the clamp bar is
And one end of the clamp bar is housed in the holding arm.
When the clamp bar is at the second width position, the other end of the clamp bar is
The other end and the inner peripheral surface.
A tool changing device for holding a tool with the tool
Solves the above problem. This keeps the tool
The clamp bar is provided on the ATC inner shaft.
Can operate accurately according to the camshaft surface shape
It is possible to perform each operation for holding the tool quickly and surely.
It becomes possible. In the present invention, for example, a tool
Tool having an inner peripheral surface corresponding to the cross-sectional shape of the tool holder
Tool exchange having a tool holding arm with a tool holder
Is realized by a switching device. That is, the tool changing device
Has a first width portion and a second width portion.
And a camshaft. The clamp cam shuff
The first clamp cam is a surface of the first width portion.
Surface and a third clamp cam surface that is a portion of the second width.
ing. Further, on the outside of the clamp cam shaft,
Fixed to the tool holding arm with a through hole in the surface
It has an ATC unit output shaft that is an empty sliding cylinder. The
Penetrate through the through hole and pass through the tool holding arm
A slidable clamp bar is provided. The sliding cylinder
ATC unit output shaft has a clamp camshaft
Is positioned so that the
It is movable along the pucum shaft. In addition, the clamp
The driven surface, which is one end of the clamp bar, is
Contact the surface of the clamp camshaft,
Contact the center axis of the clamp camshaft so that
It is being rushed. The clamp bar is ATC which is a sliding cylinder.
Unit output shaft slides along the clamp camshaft
Then you can move accordingly. The clamp bar
A first clamp cam surface whose one end driven surface has the first width;
Position, the holding surface at the other end of the clamp bar is
To retract into the holding arm,
A third clamper in which the one end of the push bar is located at the second width.
The other end of the clamp bar when the
When the surface protrudes toward the tool holding portion, the holding surface
The tool can be implemented so as to sandwich the tool with the inner peripheral surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, an embodiment of the present invention will be described.
explain about. FIG. 1 shows a tool holding arm according to the present invention.
FIG. 2 is a diagram showing a tool holding arm according to the present invention.
Of the ATC unit 17 and the machine tool when using the No. 1
FIG. 3 is a diagram showing a machine tool particularly when a tool is changed
Machine spindle 20 and ATC unit 17
FIG. First, a description will be given with reference to FIG.
In addition, the tool for performing machining is
A spindle 20 for holding a tool 25 is provided on a headstock 30.
Have been. The headstock 30 is arranged on a bed 31.
It is movable with respect to the bed 31. The headstock 30 is a tool
When replacing the bed, as shown in FIG.
Stop at the position. Bed where headstock 30 stops
31 holds a tool 26 to be exchanged and is on standby.
The tool magazine 21 is fixed. Tool change
In this predetermined position performed, the center of the spindle 20 is
The line connecting the center of the tool magazine 21 is horizontal.
You. That is, the center of the spindle 20 and the tool magazine
The center is substantially the same height in the vertical direction. Ma
Of the spindle 20 on the side where the tool 25 is mounted
A tool to which the tool 26 to be replaced with the surface 20a is attached
The surface 21a of the lumagazine 21 is substantially in the same plane.
In each of the spindle 20 and the tool magazine 21
Holds tool 25 and tool 26 in the center
Tool hole 20b and tool hole 21b
Is disposed, and the tool holder at the base of the tool 25 is provided.
25a and the tool holder 26a at the base of the tool 26
Accept. Unlike conventional machine tools, the ATC unit
G is on the same side as spindle 20 and tool magazine 21
Attached to. From the ATC unit 17,
Parallel to centerline of pindle 20 and tool magazine 21
ATC unit guide shaft 14 is fixed so that
It is arranged regularly. In addition, ATC guide shaft
The tip side (the end opposite to the ATC unit 17)
The ramp camshaft 3 (not visible in FIG. 2) is coaxial
It will extend further from the ATC guide shaft 14 toward the tip
Mounted. ATC unit guide shuff
On the outside of both the
A circle to enclose the ATC unit guide shaft 14
ATC unit output shaft 2 is attached.
You. The output shaft 2 of the ATC unit has a hollow cylindrical shape.
, Clamp camshaft 3 and ATC guide shaft 1
4 so that it can be inserted. ATC unit
The output shaft 2 has an ATC unit guide shaft 14 and
Slidable along their axes along the clamp shaft 3
Noh. The tool holding arm 1 is
Bracket 4 and the ATC unit
Output shaft 2 is used as a fastener at the tip of ATC unit output shaft 2.
More fixed. Therefore, ATC unit output shaft 2
Slides along the ATC unit guide shaft 14.
And the ATC unit arm
It moves along the axis of the id shaft 14. Tool holding
The arm 1 is basically the same as the tool holding arm 40 of the conventional device.
ATC unit guide shaft 14
Spindle 20 side and tool magazine around the center axis of
Arm 21 extending to both sides of the arm 21. tool
At both ends of the holding arm 1, a tool holding portion 9 and a tool holding portion
10 is provided. ATC unit output shaft 2 is ATC
If it can slide along the unit guide shaft 14,
Both around the center axis of the ATC unit guide shaft 14.
Can be rotated together with the tool holding arm 1. FIG. 1 shows a cross section of the tool holding arm 1.
FIG. FIG. 1 particularly shows tools 25 and 26.
Stored in the tool holder 9 and tool holder 10, respectively
Each tool is still fixed
No state is shown. At the center of the tool holding arm 1
Indicates that the ATC unit output shaft 2 is
It is fixed to the room 1. Tool holding arm 1 is ATC
The axes of the guide shaft 14 and the clamp camshaft 3
Extending from the center of the
You. Tool holding at both ends of tool holding arm 1
A section 9 and a tool holding section 10 are provided. Tool holding
The part 9 and the tool holding part 10 are provided with the tool 25 or the tool 2
To the circular shape of the cross section of the tool holder part at the root part of 6
A corresponding inner peripheral surface 9a and inner peripheral surface 10a are provided. Inner circumference
The surface 9a and the inner peripheral surface 10a are formed by the conventional tool holding portions 41 and
And 42, the shape is almost semicircular, and
Portions are missing as openings 9b and openings 10b. AT
Center position of inner peripheral surface 9a from the center of C guide shaft 14
And the center of the ATC guide shaft 14
It is almost equal to the distance to the center of the peripheral surface 10a.
I have. The opening 9b and the opening 10b have the tool holding arm 1
It has a point-symmetrical shape with the TC guide shaft 14 as the center.
It is arranged in such a positional relationship. An ATC gas is provided inside the tool holding arm 1.
Center position of the inner peripheral surface 9a through the center of the id shaft 14
A slight angle with respect to the line connecting the
On the line passing through the center of the ATC guide shaft 14
Spring holding ring 15 and spring holding ring 1
6 and the tool holder 9 respectively from the tool holder 10 side
Has been drilled. Spring retainer ring 15 and spring retainer
The inside of the ring 16 has a clamp bar 5 which is elongated in a rod shape and
The clamp bar 6 is inserted. Clamp bar 5
Spring clamp ring 15 and clamp bar 6
A part of the spring holding ring 16
7 and a spring 8 are fitted. spring
7 and one end of the spring 8 are connected to the spring holding ring 15 or
Is on the spring holding ring 16 side and the other end is the clamp bar 5 or
Each is attached to the clamp bar 6. these
Springs 7 and 8 are clamp bars 5 and
And clamp bar 6 to the center of ATC guide shaft 14.
It is mounted so that it is biased from the outside toward the side
You. That is, the conventional tool holding arm 40 is
Each of the pump bar 5 and the clamp bar 6 is a spring.
Of the tool holding arm 1 by the spring 7 and the spring 8
A at the center of the tool holding arm 1
Energized from outside toward the center axis of TC guide shaft 14
That is a big difference. Therefore, clamp
Bar 5 or clamp bar 6 is always clamp cam shuff
3 is pressed against the surface. So
Therefore, unlike the conventional device, the clamp bar 5 and the clamp
One end of each of the lamp bars 6 has a tool holding portion 9 and
Each opening 9b and opening 10 of the tool holding portion 10
The state where the tool is not held without protruding to the part b
Is always in a stowed state. The class
Tool bar 9 and tool holder 9 of clamp bar 6
Each end of the tool holding part 10 is in contact with the tool.
Holding surface 5a and holding surface 6a for holding the tool
Are provided. Next, referring to FIG.
, ATC unit output shaft 2, clamp camshaft 3
And the structural relationship between the ATC guide shaft 14
Will be explained. ATC guide shaft 14 is as described above.
Fixed to the ATC unit 17,
At the tip of the id shaft 14, the clamp cam shaft 3 is provided.
Are located. Clamp camshaft 3 and ATC
On the outside of the guide shaft 14, the output shaft of the ATC unit
2 are arranged. ATC unit output shaft 2 has two
The bracket 4 for fixing the holding arm 1 is inserted.
The bracket 4 is connected to the output shaft of the ATC unit by the fastener.
It is fixed at 2. In addition, in FIG.
4 is disassembled into a plurality of parts.
Is a specific problem, the structure is ATC unit
Fix the output shaft 2 and the tool holding arm 1 so that they are integrated.
It has the same effect as long as it is specified. Part to which the tool holding arm 1 is joined
ATC unit output to ATC unit output shaft 2
A through-hole 12 formed in a direction perpendicular to the central axis of
A through hole 13 is provided. Through hole 12 and through hole 13
Are opposite sides of the ATC unit output shaft 2
It is provided in. Clamp bar in tool holding arm 1
-5 and clamp bar 6 penetrate through hole 12
Inserted into the ATC unit output shaft 2 through the hole 13
Have been. The clamp cam shaft 3 is a clamp cam 18
And a shaft 19 inserted therein.
Have been. The shaft 19 has a rod shape and its shaft
Is approximately aligned with the axis of the ATC guide shaft 14.
Screwed and fixed to the tip of the C guide shaft 14
I have. Clamp cam 18 can rotate around shaft 19
Attached to. Clamp camshaft 3 is axial
The axial width is partially different along the direction
It has a width and a second width. For example, in this embodiment,
The width of the shaft 19 constitutes the first width, and the clamp cam
The maximum width of 18 constitutes the second width.
You. Clamp camshaft with difference between first width and second width
3 is a first clamp cam surface 3a, a second clamp cam surface 3b
And the third clamp cam surface 3c is formed. Narrowest width
Is the first width part, and the thickest width is the second width part
Minute and the slope between the first width and the second width is smooth
linked. The surface of the first width part is the first clamp
A cam surface 3a is formed, and the surface of the second width portion is
The pump cam surface 3c is formed. Of the first width and the second width
The inclined surface forms the second clamp cam surface 3b between them.
The first clamp cam surface 3a, the second clamp cam surface 3b and
And the third clamp cam surface 3c
-5 and clamp bar 6 by springs 7 and 8
The first clamp cam surface 3a, the second clamp cam
Always pressed against the surface 3b and the third clamp cam surface 3c
The clamp bar 5 and the clamp
It serves to control the movement of the bar 6. Therefore clamp
Clamp bar 5 and clamp
The first clamp cam surface 3 is provided at each end of the pull bar 6.
a, second clamp cam surface 3b and third clamp cam surface
Driven surface 5b for smooth movement according to 3c.
And a driven surface 5c, a driven surface 6b, and a driven surface 6c.
I have. Here, the first clamp cam surface 3a, the second
Followed by ramp cam surface 3b and third clamp cam surface 3c
Surface 5b and driven surface 5c and driven surface 6b and driven surface 6c
I will explain. Clamp cam shaft 3 is ATC guide
The portion closest to the shaft 14 has the narrowest width,
One clamp cam surface 3a is formed. Clamp bar 5
Abuts against the clamp camshaft 3 of the clamp bar 6
The driven surface 5b, which is a surface perpendicular to the axis of the clamp bar,
And a driven surface 6b. Clamp bar
5 and the driven surface 6b of the clamp bar 6
When the clamp bar 5 is in contact with the ramp cam surface 3a,
The end opposite to the driven surface 5b and the driven surface 6 of the clamp bar 6
The end opposite to b is the inside of the tool holding arm 1.
It will be in the state of being stored. First clamp cam surface 3a
Is located between the driven surface 5b of the clamp bar 5 and the clamp bar.
6, the driven surface 6b is in contact with the first clamp cam surface 3a.
When the tool holding arm 1 is rotated in this state,
Udo tool 25 and tool 26 hold each tool
It is a position that fits inside the part 9 and the tool holding part 10.
You. The clamp camshaft 3 has a first clamp cam surface 3a.
ATC along the axial direction of the ATC guide shaft 14
The width gradually increases as the distance from the guide shaft 14 increases.
A thick inclined surface is formed. This slope is
The lamp cam surface 3b is formed. Clamp bar 5 and
The ramp bar 6 has a driven surface 5b and another different from the driven surface 6b.
The driven surface 5c and the driven surface 6c are provided. This driven surface 5
c and the driven surface 6c are respectively a driven surface 5b and a driven surface 6c.
b. This slope is ATC unit gas
Tilting away from the id shaft 14
It is oblique. The driven surface 5c and the driven surface 6c are second clamps.
Abutting on the cam surface 3b, the axial direction of the clamp cam shaft 3
And the driven surface 5c and the driven surface 6c
It becomes movable along the amplifying cam surface 3b. And ku
The ramp cam shaft 3 is moved from the second clamp cam surface 3b to A
ATC gas is further applied along the axial direction of the TC guide shaft 14.
The width becomes the widest as it gets away from the id shaft 14.
And forming a third clamp cam surface 3c having a constant diameter.
You. Clamp bar 5 and clamp bar 6 are again
The moving surface 5b and the driven surface 6b form the third clamp cam surface 3c.
Abut. The driven surface 5b of the clamp bar 5 and the clamp bar
-6 driven surface 6b abuts against the third clamp cam surface 3c.
The end opposite to the driven surface 5b of the clamp bar 5
The end of the clamp bar 6 opposite the driven surface 6b is
The holding surface 5a and the holding surface 6a
Are in contact with the tool holding portions 25b of the tools 25 and 26.
It comes into contact with the tool holding portion 26b. And the holding surface 5a
And the inner peripheral surface 9a serve as the tool holding portion 25b and the holding surface 6a.
The inner peripheral surface 10a sandwiches the tool holding portion 26b, respectively.
To hold each of the tool 25 and the tool 26
State. Next, referring to FIG. 3 to FIG.
How to move the arm 1 to hold and exchange tools
Will be described. First, without changing the tool
Is a tool holding arm 1 shown in a horizontal state in FIG.
Is in a vertical state. FIG. 3 shows this state, that is, the tool.
Standby state before tool exchange when holding arm 1 is vertical
State. In this state, the tool holding arm 1
The driven surface 5b of the clamp bar 5 and the
The moving surface 6b is the first clamp cam of the clamp cam shaft 3.
Surface 3a, the clamp bar 5 and the clamp
The bars 6 are respectively a tool holder 9 and a tool holder 1
It does not protrude into 0. Here, the tool holding part 9 is opened.
The mouth 9b is connected to the tool 25 by the opening 10b of the tool holding portion 10.
ATC unit output shaft 2
When the tool is rotated 90 degrees, the tool holding
Arm 1 is in a horizontal position (however,
Is not pulled out). And in this state
The tool 25 and the tool 26 are respectively
And it will be in the state which fits in the tool holding part 10. This state
In this state, the tool 25 and the tool 26 are
And just within the tool holder 10, the clamp bar
-5 and clamp bar 6 are still in tool 25 and tool 2.
No contact with 6. In other words, the clamp bar 5 and
And the clamp bar 6 does not contact the tool 25 and the tool 26.
Then, the tool 25 and the tool 26 are
And in the tool holding unit 10. Next, the ATC unit output shaft 2 is
ATC unit guide shaft 14 without rotating
Then, attach the ATC unit to the distal end of the clamp camshaft 3.
Slide away from the door 17. Then, the tool
When the holding arm 1 moves with it,
Clamp bar 5 and clamp bar 6 are ATC units
AT on the tip side of clamp camshaft 3 together with output shaft 2
Move away from C unit 17. Of that move
During the process, the driven surface 5c of the clamp bar 5 and the clamp
Each of the driven surfaces 6c of the pull bar is the second clamp cam surface 3.
Ascends the slope of the second clamp cam surface 3b while abutting on
The clamp bar 5 and the clamp bar 6
Are in the tool holding section 9 and the tool holding section 10, respectively.
Projecting toward the respective openings 9b and 10b.
And the holding surface 5a of the clamp bar 5 on the tool holding portion 9 side.
Is attached to the tool holder 25a of the tool 25,
The holding surface 6a of the clamp bar 6 on the 10 side is
It moves in the direction in which it contacts the tool holder 26a. ATC
Unit output shaft 2 is further extended beyond clamp camshaft 3.
As it moves to the end side, the second clamp cam surface 3b
According to the width of the clamp bar 5 and clamp bar 6
The protrusions into the respective tool holders 9 and 10
The output increases and the clamp bar 5 is clamped to the tool 25.
The bars 6 abut against the tools 26, respectively. Clamp bar
5 and the driven surface 6b of the clamp bar 6
ATC unit goes out until it comes in contact with three clamp cam surface 3c
When the force shaft 2 is moved, the clamp bar 5 and the clamp bar 6 are moved.
Of each of the tool holding portions 9 and 10
Is completed. At this stage, tool 25 is also a tool
26 is also firmly held by the tool holder 9 and the tool holder 10.
Have been. This state is the state shown in FIG. Real truth
In the case of the embodiment, the output shaft 2 of the ATC unit is 14.5 mm.
The clamp bar 5 and the clamp bar
6 is set to complete a 10 mm protrusion. What
At this stage, if the chips from the machine tool
Clamp bar 5 or clamp
If the ramp bar 6 cannot be moved, the ATC unit
Output shaft 2 also cannot move. ATC unit 17 is ATC
If it detects that unit output shaft 2 cannot move,
And drive the ATC unit output shaft 2
Operate to stop. Subsequently, the output shaft 2 of the ATC unit is further connected.
ATC unit guide shaft 14 without rotating
Then, attach the ATC unit to the distal end of the clamp camshaft 3.
When the tool is slid away from
1 is also clamped together with the ATC unit output shaft 2.
Move to the tip side of the shaft 3. Clamp bar 5 and
The clamp bar 6 is connected to each of the driven surfaces 5b and 6
b is in contact with the third clamp cam surface 3c.
The tool 25 and tool 26 also hold the tool
Part 9 and the tool holding part 10
State continues. Therefore, this movement
25 and tool 26 respectively
Move away from the tool magazine 21. AT
When the movement of C unit output shaft 2 is completely completed,
Each of the tool 25 and the tool 26 is
And it is completely extracted from the tool magazine 21. This
Is the state shown in FIG. In the case of this embodiment,
The whole including the 14.5mm movement of the ATC unit
As a state where the movement of about 109 mm is completed
ing. From here, the output shaft of the ATC unit is set to 180 degrees.
When the tool is rotated, the tool 26 is
The position is moved so that the tool 25 is on the tool magazine 21 side
I do. From here, when the reverse process is performed, the tool 26
In the tool hole 20a of the pindle 20, the tool 25 is
It fits in the tool hole 21a of the tool magazine 21.
That is, the ATC unit output shaft 2 is changed from the state of FIG.
Clamp bar in the direction approaching the TC guide shaft 14 side
-5 and the driven surface 6c of the clamp bar 6
Immediately before starting contact with the second clamp cam surface 3b,
When the tool 26 is moved to the
In the tool hole 20a, the tool 25 is a tool magazine
21 fits in the tool hole 21a. From here,
ATC unit output shaft 2 to ATC guide shaft 14
When it is moved in the direction approaching the
The moving surface 5c and the driven surface 6c of the clamp bar 6
It abuts on the pump cam surface 3b. Then clamp bar 5 and
And the clamp bar 6 adjusts the inclined surface of the second clamp cam surface 3b.
Inside the ATC unit guide shaft 14 as if descending
Move towards your heart. This series of operations is performed by the tool holding unit 9.
And the tool holding part 10 side,
Pump bar 5 and clamp bar 6 are tools 25 and tools
26, the tool holding part 9 and the tool holding part 1
From 0, each is stored in the tool holding arm 1
Works as follows. The driven surface 5b of the clamp bar 5 and the clamp
The driven surface 6b of the ramp bar 6 is in contact with the first clamp cam surface 3a.
At the contact stage, the clamp bar 5 and clamp bar 6
Tool 25 and tool 25
The holding of the knob 26 is released. Spindle 20 or
Tool 25 and tool 26 by tool magazine 21
Until the tool is completely held, the tool holding part 9 and
Tool holder 10 and spindle 20 or tool magazine
Tool 25 and the wall of each hole in
In this state, the tools 26 are held respectively. Soshi
The spindle 20 holds the tool 26 in the tool magazine 2
1 firmly holds and fixes the tool 25. These holdings
After the completion, the opening 9b of the tool holding portion 9 is
The opening 10b of the tool holding part 10 is separated from the tool 26.
When the output shaft of the ATC unit is rotated 90 degrees in the direction
The tool change is completed. According to the present invention, the tool is not brought into contact with the clamp bar.
Put it in the tool holder and then use the clamp bar to
Rules can be maintained. As a result,
When the clamp bar comes into contact with the tool
The generated noise can be prevented. Also, the clamp bar
Spring ATC guide shaft toward the center
With the clamp bar urged from the outside, pull the clamp bar
Driving the knit output shaft resists the urging force of this spring.
While moving on the clamp cam surface of the clamp cam shaft.
The movement of the clamp bar restores the spring
Relatively large ATC unit output, not by force
It can be based on the driving force of the shaft. Therefore, some cutting
Reliable clamp bar drive even when solidification of powder or cutting oil occurs
Can be performed. Also, in the unlikely event that a machine tool is
As powder enters the tool holding arm,
Chips have a significant effect on the equipment so that the
The ATC unit output shaft movement itself
Cannot be detected, the ATC unit side can detect it.
Therefore, the ATC unit sounds an alarm,
Take measures to stop driving the C unit output shaft
be able to. The tool holding arm of the present invention
Due to the characteristics of the camshaft, the operation of the clamp bar is
The effect of both holding the lock and locking the clamp bar.
Therefore, unlike conventional equipment, the clamp bar lock
Mechanism intended only for clamping (for example,
It is not necessary to provide the components of (time).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a cross section of a tool holding arm according to the present invention. FIG. 2 is a diagram showing an overview of a machine tool using the tool holding arm of the present invention. FIG. 3 is a view showing a cross section of a tool holding arm and an ATC unit guide shaft portion of the present invention, and particularly showing a position where a clamp bar is housed in the tool holding arm. FIG. 4 is a diagram showing a cross section of a tool holding arm and an ATC unit guide shaft portion of the present invention, and particularly showing a position where a clamp bar has completed projecting from the tool holding arm to the tool holding portion. is there. FIG. 5 is a view showing a cross section of a tool holding arm and an ATC unit guide shaft portion according to the present invention;
FIG. 10 is a diagram illustrating a position where the movement of the output shaft of the TC unit is completely completed and the tool is extracted. FIG. 6 is a diagram showing an overview of a machine tool using a conventional tool holding arm. FIG. 7 is a view showing a cross section of a conventional tool holding arm. FIG. 8 is a view showing a cross section of a tool holding arm portion of the conventional device, and particularly a view showing a state immediately before the clamp bar holds the tool and a state where the lock of the clamp bar is released. It is. FIG. 9 is a view showing a cross section of a tool holding arm portion of the conventional apparatus, particularly when the clamp bar is being held by the tool while the clamp bar is holding the tool. It is a figure showing a position of a state where it is. FIG. 10 is a view showing a cross section of a tool holding arm portion of the conventional device, and particularly a view showing a position where the clamp bar has completed holding of the tool and a state where the clamp bar is locked. . [Description of Signs] 1 Tool holding arm 2, 11 ATC unit output shaft 3 Clamp cam shaft 4 Fastener 5, 6 Clamp bar 7, 8 Sling 9, 10 Tool holding part 12, 13 Through hole 14 ATC unit guide shaft 15, 16 Spring holding ring 17 ATC unit 20 Spindle 21 Tool magazine

Claims (1)

Claims 1. A tool changing device having a tool holding arm having a tool holding portion having an inner peripheral surface corresponding to a cross-sectional shape of a tool holder of a tool, the tool changing device comprising: A clamp camshaft having a first width portion and a second width portion, a sliding cylinder to which the tool holding arm is fixed and slidable along the clamp camshaft; A clamp bar movable along the clamp camshaft and slidable within the tool holding arm, wherein the clamp bar is biased toward a central axis of the clamp camshaft to provide the clamp bar. One end of the clamp bar contacts the surface of the clamp camshaft, and when the one end of the clamp bar is at the position of the first width, the other end of the clamp bar retracts from the tool holding portion,
When the one end of the clamp bar is at the position of the second width, the other end of the clamp bar protrudes toward the tool holding portion and clamps the tool between the other end and the inner peripheral surface. A tool changing device.