JP2001105262A - Tool replacing device for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically replace a tool which using a cam clamp mechanism in a machine tool with the structure that the cam clamp mechanism having a clamp bolt to be rotated around an axis crossing an axis of the rotation of a spindle is provided at a tip of the spindle. SOLUTION: A moving body 250 capable of reciprocating in a direction crossing an axis of the rotation of a spindle at a replacement position SC is driven for reciprocation in the axial direction by a moving body driving means, and a rotary shaft 252 supported by the moving body 250 freely to be rotated around the axis crossing the axis of the rotation of the spindle is connected to a wrench 236, and driven for rotation in any direction of the normal and reverse direction by a rotary shaft driving means 253. Whether a tip of the wrench 236 is engaged with a clamp bolt or not is detected by an engaging condition detecting means 267, and the number of rotation of the wrench 236 in the normal and reverse direction is detected by a number of revolution detecting unit 270, and the output torque of the rotary shaft driving means 254 in the normal and the reverse direction is detected by a torque detecting unit 272.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cam clamping mechanism having a clamp bolt rotatable about an axis perpendicular to a rotation axis of a spindle, the clamping state of a tool by rotating the clamp bolt in a forward direction, and The present invention relates to a machine tool provided at a tip of the spindle so that an unclamping state of a tool can be switched by rotating the clamp bolt in a reverse direction, and more particularly to an improvement of a device for exchanging a tool at a tip of a spindle.

[0002]

2. Description of the Related Art Conventionally, a tool is generally fastened to a tip portion of a spindle by a fastening means using a drawbar. However, such a fastening means is used to automatically change tools. This not only complicates the device configuration,
It becomes a large scale.

[0003]

On the other hand, there is a machine tool in which a cam clamp mechanism having a clamp bolt rotatable about an axis perpendicular to the rotation axis of the spindle is provided at the tip of the spindle. A state in which the tool is clamped to the tip of the spindle by rotating the clamp bolt in the forward direction and a state in which the tool is unclamped to the tip of the spindle by rotating the clamp bolt in the reverse direction are switched. ing. However, such a cam clamp mechanism
Generally, the tool is used to change tools by manual operation of an operator, and conventionally, it has been difficult to automatically change tools.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tool changer for a machine tool that enables automatic change of tools by using a cam clamp mechanism provided at a tip end of a spindle. Aim.

[0005]

In order to achieve the above object, the present invention provides a cam clamp mechanism having a clamp bolt rotatable about an axis perpendicular to a rotation axis of a spindle, the cam clamp mechanism comprising: A cam clamp mechanism of the spindle is provided in a machine tool provided at the tip of the spindle, by switching between a clamp state of the tool by rotating the tool and an unclamping state of the tool by rotating the clamp bolt in the reverse direction. A moving body capable of reciprocating in a direction orthogonal to the rotation axis of the spindle at the exchange position to be obtained; a moving body driving means for reciprocatingly driving the moving body; and a rotation about an axis orthogonal to the rotation axis of the spindle. A rotation shaft supported by the moving body as possible; relative rotation about the rotation shaft axis not possible And a wrench capable of allowing a relative movement in a limited range in the axial direction of the rotating shaft and having a base end coaxially connected to one end of the rotating shaft and engaging a distal end with the clamp bolt. A spring contracted between the base end of the wrench and one end of the rotating shaft; and a rotating shaft capable of driving the rotating shaft to rotate in both forward and reverse directions regardless of the moving position of the moving body. Driving means; an engagement state detector for detecting whether or not the tip of the wrench has engaged with the clamp bolt according to the axial relative positions of the rotating shaft and the wrench; A rotation speed detector for detecting a rotation speed; a torque detector for detecting an output torque of the rotation shaft driving means in a forward rotation direction; a detection of the engagement state detector, the rotation speed detector, and the torque detector Based on the results, Characterized in that it comprises a; and control means for controlling the operation of the body drive means and the rotary shaft drive means.

According to such a configuration, when removing the tool from the tip of the spindle, first, the moving body is cammed by the moving body driving means with the cam clamping mechanism at the tip of the spindle being brought to the replacement position. Move to the clamp mechanism side and engage the tip of the wrench with the clamp bolt. At this time, when the tip of the wrench does not engage with the clamp bolt, the axial relative position of the rotating shaft and the wrench changes while compressing the spring, and by detecting this with the engagement state detector, The secure engagement of the wrench with the clamp bolt can be confirmed. After confirming that the wrench has engaged the clamp bolt, the cam clamp mechanism can be brought into the unclamped state by operating the rotating shaft driving means in the reverse direction. When the rotation speed of the wrench is detected, the operation of the rotating shaft driving means is stopped and the moving body is moved by the moving body driving means in a direction away from the cam clamp mechanism, so that the engagement of the wrench with the clamp bolt is released. As a result, the wrench separates from the cam clamp mechanism. When a new tool is mounted on the tip of the spindle, move the moving body to the cam clamp mechanism side at the replacement position, engage the tip of the wrench with the clamp bolt, and place the tip of the wrench on the clamp bolt. The cam clamp mechanism can be brought into the clamped state by operating the rotating shaft drive means in the normal rotation direction after the engagement state detector detects that the engagement has been performed, and the torque detector can set a predetermined torque. When the detection is detected, the operation of the rotating shaft driving means is stopped, and the moving body is moved by the moving body driving means in a direction away from the cam clamp mechanism. Separates from the cam clamp mechanism. In this way, it is possible to automatically switch between the clamped state and the unclamped state of the cam clamp mechanism, and it is possible to automatically attach and detach the tool to and from the tip of the spindle.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on one embodiment of the present invention shown in the attached drawings.

1 to 28 show an embodiment of the present invention. FIG. 1 is an overall side view of a machine tool, FIG. 2 is a plan view of FIG. FIG. 4 is a front view of FIG.
5 is an enlarged sectional view taken along line 5-5 of FIG. 2, FIG. 6 is a sectional view taken along line 6-6 of FIG. 5, FIG. 7 is a sectional view taken along line 7-7 of FIG. 5, and FIG. FIG. 9 is a sectional view taken along line 8-8 of FIG. 5, and FIG.
10 is an enlarged sectional view taken along line 10-10 of FIG. 9, FIG. 11 is an enlarged sectional view of the second positioning means taken along line 11-11 of FIG. 5, and FIG. FIG. 13 is a sectional view of the positioning means corresponding to FIG. 11, and FIG. 13 is a sectional view of FIG. 11 for explaining the locking operation of the second positioning means.
14 is a cross-sectional view taken along line -13, FIG. 14 is a cross-sectional view corresponding to FIG. 8 in a state of measurement by the measuring means, and FIG.
FIG. 16 is an enlarged view taken along arrow 16 in FIG. 2, and FIG.
Is a cutaway side view as seen from the direction of arrows 17-17 in FIG. 16, FIG. 18 is a sectional view taken along lines 18-18 in FIG. 17, FIG. 19 is a view as seen in arrows 19-19 in FIG. 17, and FIG. 19 is an enlarged view of a portion indicated by an arrow 20 in FIG. 20, FIG.
2 is a sectional view taken along line 22-22 of FIG. 20, FIG. 23 is a sectional view showing a cam clamp mechanism at the tip of the spindle, FIG. 24 is a sectional view taken along line 24-24 of FIG. 16, and FIG.
FIG. 26 is a sectional view taken along line 26-26 of FIG. 24, FIG. 27 is an enlarged sectional view taken along line 27-27 of FIG. 24, and FIG. 28 is a view showing a control system.

Referring first to FIGS. 1 to 4, this machine tool includes, for example, a connecting rod 4 used in a vehicle engine.
1, the inner surface of the large-diameter hole 42 provided in the large end portion 41a, and the connecting rod 41 having a smaller diameter than the large-diameter hole 42.
, Which finishes the inner surface of the small-diameter hole 43 provided in the small end portion 41b, and positions and holds a plurality of, for example, four connecting rods 41, 41 on a base 45 installed on the floor surface. Processing means 48 having a holding device 46 and a single spindle 47 for finishing the large-diameter holes 42 and the small-diameter holes 43 of the connecting rods 41, 41 held by the positioning and holding device 46; Measuring means 51 having a pair of inner diameter measuring devices 49 and 50 for individually measuring the inner diameters of the large diameter hole 42 and the small diameter hole 43 in the connecting rod 41 after finishing processing is completed.
And a tool stocker 53 for stocking a plurality of tools 52 which are exchangeably mounted on the tip of the spindle 47.
And a tool attachment / detachment unit 54 capable of removing the tool 52 from the tip of the spindle 47 and attaching a new tool 52 to the tip of the spindle 47 are provided.

An X-axis and a Y-axis, which are orthogonal to each other in a horizontal plane, are set on the base 45.
A holding frame 55 is disposed on the base 45 at a position closer to one end side (left end side in FIGS. 1 and 2) along the Y axis, and is rotatable around an axis parallel to the X axis. Is provided.

On one side of the holding frame 55 on the outer side of the base 45, a plurality of workers, for example, a pair of connecting rods 4 are provided.
Attachment / detachment positions SH for performing attachment / detachment operations of the holding frames 55 on the holding frame 55 are set on the other side of the holding frame 55 on the inner side of the base 45 by a processing means 48. A processing position SP for performing finishing processing on the connecting rods 41, 41 is set.

At both ends of the holding frame 55, a support base 5 fixed to the base 45 so as to protrude upward from the base 45.
Index unit 5 fixed and supported on 8,59
6 and an index support unit 57 are coaxially connected, and by these units 56 and 57,
The holding frame 55 is rotated by 180 degrees in the direction indicated by the arrow 61 in FIG. The holding frame 55 is covered with a cover 60 that allows the holding frame 55 to face the attachment / detachment position SH and the processing position SP.

Referring also to FIGS. 5 to 8, two sets of connecting rods are provided on the side face facing the attaching / detaching position SH and the processing position SP of the holding frame 55 at intervals in the X-axis direction. 41, 41 are respectively positioned and held in a horizontal posture, and two side surfaces of the holding end 55a facing the attachment / detachment position SH and the processing position SP, each pair of which is in contact with the large end 41a of the connecting rod 41, are provided. And two pairs of reference support surfaces 63 for contacting the small end 41b of the connecting rod 41 with the holding frame 5.
5 are formed at symmetrical positions with respect to the horizontal rotation axis 64.

The holding frame 55 has two sets of first positioning means 65, 65, one pair each, two sets of clamping means 66, 66, one pair each, and two sets of natural locking means 67, 67, one pair each. Are provided on both side surfaces of the holding frame 55 facing the attachment / detachment position SH and the processing position SP in a symmetric arrangement with respect to the rotation axis 64.

The first positioning means 65 includes a reference support surface 63.
The small end portion 41b of the connecting rod 41 contacting the
It is possible to switch between a locked state in which positioning is performed by contacting a plurality of locations on the inner surface in the circumferential direction, and an unlocked state in which positioning of the small end portion 41b is released and detaches from the small diameter hole 43.

Referring further to FIG. 9, the first positioning means 65 has a reference support surface 63 on its outer end surface for contacting the small end portion 41b of the connecting rod 41, and is detachably fastened to the holding frame 55. Guide member 68 and the small end portion 41b
The guide member 68 is formed in a cylindrical shape so that one end thereof can be coaxially inserted into and removed from the small-diameter hole 43.
A holder 69 guided in the axial direction by the
, A plurality of steel balls 70, 70... Held at one end of a holder 69 so as to be able to move in the radial direction of
Are tapered so that 0, 70... Are pushed outward in the radial direction of the holder 69 and are brought into contact with a plurality of locations on the inner surface of the small diameter hole 43
1a at one end and a taper pin 71 coaxially inserted into the holder 69 to enable relative movement in the axial direction.
And

The guide member 68 has a flange portion 6 detachably fastened to the side surface of the holding frame 55 with a plurality of bolts 72.
8a is formed in a cylindrical shape having an outer end. Holder 69
Is formed in a cylindrical shape, and is fitted in the guide member 68 so as to be slidable in the axial direction. One end of the holder 69 is closed by a cap 73, and a plurality of steel balls 70, 70,.
Is held at one end of the holder 69 so that the holder 69 can move in the radial direction.

Between the guide member 68 and the holder 69,
Rotation preventing means 76 for preventing rotation of the holder 69 is provided. The rotation preventing means 76 extends in the axial direction at a position corresponding to the inside of the guide member 68 and is provided with a single piece provided on the outer surface of the holder 69. It comprises a groove 74 and a screw member 75 screwed into the guide member 68 and engaged with the groove 74. Accordingly, the holder 69 is guided in the axial direction by the guide member 68 in a state where the rotation about the axis is prevented by the rotation preventing means 76.

In the first positioning means 65, one end of the holder 69 is connected to the connecting rod 4 at the attaching / detaching position SH.
The holder 69 is inserted into the small-diameter hole 43.
9, the steel balls 70 are pushed by the tapered surface 71a and come into contact with a plurality of circumferential locations on the inner surface of the small-diameter hole 43. As a result, the small diameter portion 41b abutting on the reference support surface 63 is locked. In order to make the unlocked state in which the positioning is released, the taper pin 71 is moved relative to the holder 69 in the axial direction to a position where the pushing force is not applied to the steel balls 70, 70. What is necessary is just to move the holder 69 in the axial direction to the position where it is detached from the small diameter hole 43.

The rotation axis 64 of the holding frame 55
A pair of first positioning means 6 arranged symmetrically with respect to
5 and 65 are commonly driven by a positioning drive unit 77. The positioning driving means 77 is connected to the connecting rod 41.
The holder 69 in the direction along the axis of the small diameter hole 43
Can be reciprocated in the axial direction so that the holding frame 5
5 supported by the holding frame 55 and a second driving unit 78 supported by the holding frame 55 so that the tapered pin 71 can reciprocate in the axial direction in the direction along the axis of the small-diameter hole 43.
A drive unit 79.

The first driving portion 78 has a cylindrical cylinder 80 having an axis coaxial with the small diameter hole 43 and fixed to the holding frame 55, and is slidably fitted to the cylinder 80. It has a holder driving body 81, and guide cylinders 82, 82 are fastened to both ends of the cylinder body 80.

The holder driving body 81 includes the both guide cylinders 8.
The two guide cylinders 8 are provided at both ends of a cylindrical driving body main portion 81a which is slidably fitted to the cylinder body 80 between the two guide cylinders 2 and 82.
2 and 82, cylindrical rod portions 81b, 81b fitted fluid-tightly and slidably in the axial direction are coaxially and integrally connected to each other. An annular first portion between the inner portion of the cylinder body 80 and the inner periphery of the rod portion 81b, between the inner ends of the guide cylinders 82, 82 and the inner periphery of the rod portions 81b, 81b.
Fluid pressure chambers 83, 83 are respectively formed, and first fluid pressure conduits 84, 84 respectively communicating with the first fluid pressure chambers 83, 83 are provided.
Are connected to the cylinder body 80.

In the first driving section 78, the fluid pressure is applied to one of the first fluid pressure chambers 83, 83 and the fluid pressure is released from the other of the first fluid pressure chambers 83, 83. Therefore, the holder driving body 81 reciprocates in the axial direction.

In addition, an annular recess 85 is provided on the outer surface of the driving body main portion 81a of the holder driving body 81, and a groove 86 deeper than the annular recess 85 is provided extending in the axial direction. Since the engaging screw member 87 is screwed into the cylinder body 80, the rotation of the holder driving body 81 around the axis is prevented.

The second drive part 79 is formed with a second fluid pressure chamber 88 communicating with the annular concave part 85 therebetween, and is fitted in the axial middle part of the holder drive body 81 in a fluid-tight and slidable manner in the axial direction. A pair of pin driving bodies 89, 89, guide cylinders 90, 90 fixed in the holder driving body 81 outside of the pin driving bodies 89, 89 in the axial direction, and pin driving bodies 89, 8
9 is provided with pin driving bodies 89 and 89 and return springs 91 and 91 provided between the guide cylinders 90 and 90 by exerting a spring force for urging the pin driving body 9 toward the second fluid pressure chamber 88. , 89, the rods of which the base ends are connected integrally and coaxially
a, 89a are slidably fitted to the respective guide cylinders 90, 90.

Drive main part 81 of holder drive 81
On the outer surface of “a”, annular sealing members 92, 92 for sealing between the first fluid pressure chambers 83, 83 and the annular recess 85 are mounted, and regardless of the axial position of the holder driving body 81, the annular recess 85, The second communicating with the first fluid pressure chamber 88
A fluid pressure conduit 93 is connected to the cylinder body 80.

In the second driving section 79, the state in which the fluid pressure is applied to the second fluid pressure chamber 88 and the state in which the fluid pressure is released from the second fluid pressure chamber 88 are switched, so that the pair of pins The driving bodies 89, 89 can be moved relative to the holder driving body 81 in the axial direction.

The first fluid pressure conduits 84, 84 and the second fluid pressure conduit 93 are commonly connected to a fluid pressure distribution plate 94 which constitutes a part of the holding frame 55. Are arranged above or below the holding frame 55 in accordance with the rotation of the holding frame 55 by 180 degrees.

Referring also to FIG. 10, holder driving body 8
Ring-shaped restriction plates 97, 97 are fastened to the distal ends of the rod portions 81b, 81b in FIG. At a plurality of places (three places in this embodiment) at equal intervals in the circumferential direction of the inner periphery of the regulating plate 97, regulating projections 97a projecting inward in the radial direction of the regulating plate 97 project. Is done. On the other hand, the other end of the holder 69 in the first positioning means 65 is inserted into the rod portion 81b through the regulating plate 97, and the other end of the holder 69 is brought into contact with the guide cylinder 90. You.

On the outer surface on the other end side of the holder 69, engaging projections 69a, 69a... Which engage with the regulating projections 97a, 97a. Are provided at a plurality of locations (three locations in this embodiment), and the engagement projections 69a, 69a.
The holder 69 and the holder driving body 8 are arranged such that the a, 69a...
When the relative position around the axis 1 is determined, the holder 6
9 is formed so that the other end can be separated from the regulating plate 97. Thus, the holder driving body 8
1 includes a connection state in which the holder 69 is prevented from moving relative to the holder driving body 81 in the axial direction, and a relative rotation of the holder 69 relative to the holder driving body 81 about the axis by a set amount from the connection state. Thus, the other end of the holder 69 is connected so that the connection state can be switched to the connection release state for releasing the connection state.

The other end of the holder 69 and the tapered pin 71
A spring 98 is provided between the other ends of the rods so as to exert a spring force in a direction of moving the taper pin 71 toward the guide cylinder 90 with respect to the holder 69, and a rod that penetrates the guide cylinder 90 movably in the axial direction. 89a is the tapered pin 7
1 is coaxially abutted on the other end. That is, the pin driver 89
Is coaxially abutted on the other end of the tapered pin 71.

According to the positioning driving means 77, the first positioning means 65 of the pair of first positioning means 65, 65 connected to the positioning driving means 77, on the side of the attaching / detaching position SH.
It is possible to drive both of the first positioning means 65, 65 by setting the positioning means 65 in the locked state and setting the first positioning means 65 on the processing position SP side in the unlocked state.

With particular attention to FIG.
Is to press the connecting rod 41 toward the reference support surfaces 62 and 63 to hold the connecting rod 41 to the holding frame 55, and to perform an up-and-down operation about an axis parallel to a horizontal rotation axis 64 of the holding frame 55. And a clamper 101 provided at one end of the clamp arm 100 so as to be able to abut on the connecting rod 41 to drive the clamp arm 100 up and down. Driving cylinder 102 is connected to the other end of clamp arm 100.

The clamper 101 has reference support surfaces 62 and 63
Can contact the intermediate portion of the connecting rod 41 in a state where the large end portion 41a and the small end portion 41b are in contact with each other,
Engagement flange 10 that engages with clamper 101 with spherical washer 103 interposed between one end of clamp arm 100
A holding pin 104 having at one end a spherical washer 103 and a clamp arm 100,
The pin 105 is inserted into one end of the clamp arm 100 so as to penetrate the middle part of the clamp arm 100 along one diameter line.
And an annular engagement groove 10 provided on the outer surface of the pin 105.
The clamper 101 is swingably attached to one end of the clamp arm 100 with the screw member 107 screwed to the clamp arm 100 so as to engage with the clamp arm 6. A positioning pin 108 is implanted at one end of the clamp arm 100. The positioning pin 108 is inserted into the clamper 101 to determine the position of the clamper 101 while allowing some play.

The clamp driving cylinder 102 is formed in a cylindrical shape with a closed end having an axis along the Y-axis direction and having one end closed, and an opening at the other end disposed outside the holding frame 55. 109, a cylinder cap 110 for closing the opening at the other end of the cylinder body 109, and a cylinder body 10
9 and a piston 111 slidably fitted to the cylinder body 109 and the cylinder cap 1.
10 are held together by a plurality of bolts 112.
Fixed to 5.

In the cylinder body 109, the cylinder body 10
9 between the one end wall and the piston 111.
13 is also the cylinder cap 110 and the piston 1
Fourth fluid pressure chambers 114 are formed between the first and second fluid pressure chambers 11, respectively.
The fourth fluid pressure conduits 115 and 116 are connected to the cylinder body 109 so as to individually communicate with the third and fourth fluid pressure chambers 113 and 114. Therefore, it is possible to switch between the action of the fluid pressure on one of the third and fourth fluid pressure chambers 113 and 114 and the release of the fluid pressure from the other of the third and fourth fluid pressure chambers 113 and 114, and such fluid By the pressure switching control, the clamp driving cylinder 102 operates to reciprocate the piston 111 in the Y-axis direction.

In the piston 111, a rod 111a penetrating the one end wall of the cylinder body 109 in a fluid-tight and axially movable manner and a rod 111b penetrating the cylinder cap 110 in a fluid-tight and axially movable manner are coaxial. The cylinder body 109 is provided with a stroke detector 118 which detects the operating state of the clamp driving cylinder 102 by detecting a detected part 117 provided at the tip of one rod 111a. Also, the tip of the other rod 111b protruding from the cylinder cap 110 is
The other end of the clamp arm 100 is connected via a shaft 119 having an axis parallel to the rotation axis 64 of the holding frame 55.

The bracket 1 is attached to the cylinder cap 110.
The bracket 120 has one end provided with one end of a link 122 and a shaft 121 parallel to the shaft 119.
The other end of the link 122 is connected to the shaft 11
Clamp arm 1 via shaft 123 parallel to 9 and 121
00 is connected to the middle part.

In such a clamp means 66, the clamp arm 100 can be raised and lowered by the clamp driving cylinder 102, and the reference support surfaces 62 and 63 can be used.
The connecting rod 41 having the large end portion 41a and the small end portion 41b abutted against the reference support surfaces 62 and 63 is pressed by the clamper 101 toward the reference support surfaces 62 and 63, and the connecting rod 41 is fixedly held on the holding frame 55. The state in which the pressed state is released to release the holding of the connecting rod 41 to the holding frame 55 can be switched.

Further, the clamp means 66 and the clamp driving cylinder 102 are connected to the clamper 10 at the attaching / detaching position SH.
1 is disposed above the clamp driving cylinder 102, and the clamper 101 is disposed below the clamp driving cylinder 102 at the processing position SP so as to be positioned below the clamp driving cylinder 102.

Paying particular attention to FIG. 7, the natural lock means 67 includes an unlocked state in which the outer surface of the large end portion 41a of the connecting rod 41 is elastically held so that an operator can attach and detach the outer surface by human power. This is for switching and holding the locked state in which the end 41a is fixedly held.

The natural lock means 67 includes a pair of housings 125, 125 fixed to the holding frame 55 so as to be disposed on both sides of the large end 41a in a direction perpendicular to the X axis and the Y axis. Plungers 1 supported on the housings 125, 125, respectively, to allow movement in a limited range in a direction perpendicular to the axis and the Y axis.
26, 126, contact members 127, 127 detachably attached to the tip of each of the plungers 126, 126 so as to be able to contact the outer surface of the large end 41a, and one end of each of the plungers 126, 126 The pressing pins 128, 128 which are inserted into the housings 125, 125 so as to face the rear ends thereof and are movable in the Y-axis direction and supported by the holding frame 55, respectively. Bolts 129, 129 whose one ends are screwed coaxially to the other ends, and the other ends of both bolts 129, 129 which can be engaged with the enlarged diameter heads 129a, 129a at the other ends of the bolts 129, 129 And a first spring 131,1 contracted between the housings 125,125 and the plungers 126,126.
31, the other end of the pressing pins 128, 128 and the connecting plate 1
Second springs 132, 132 are provided between the springs 30;

The plunger 126 has a housing 125.
Holes 134 through which the restriction pins 133 are inserted
Are formed along the one diameter line of the plunger 126 and long in the axial direction of the plunger 126, and the movement of the plunger 126 in the axial direction is restricted by the regulating pin 133 and the regulating hole 134. The contact member 127 is attached to the tip of the plunger 126 protruding from the housing 125. In order to allow the contact member 127 to be replaced according to the type of the connecting rod 41, the contact member 127 is attached. It is detachably attached to the plunger 126.

The first spring 131 moves the plunger 1 in a direction in which the contact member 127 contacts the outer surface of the large end 41a.
Although the spring exerts a biasing force on the plunger 126, when the pressing force from the pressing pin 128 does not act on the plunger 126, the large end 41a of the connecting rod 41 is moved by the pair of abutting members 127, 127 on both sides. The spring load of the first spring 131 is set so as to exert a spring force of a degree that the first spring 131 is temporarily pinched.

At the rear end of the plunger 126, a pressing pin 1
The pressure receiving surface 135 is formed so as to be inclined toward one end of the pressure receiving surface 128.
A pressing surface 136 inclined corresponding to 35 is formed.

One end of the pressing pin 128 is inserted into the housing 125 so as to be movable in the axial direction.
The other end of 28 is fitted to the holding frame 55 so as to be slidable in the axial direction. When the pressing pin 128 moves to one end in the axial direction, the pressing surface 136 moves to the pressure receiving surface 135.
, The plunger 126 is pressed in a direction of pressing the contact member 127 at the tip thereof against the outer surface of the large end portion 41a.

The second spring 132 is a spring force for moving the pressing pin 128 to one end in the axial direction, that is, the contact member 1.
27 can exert a spring force for pressing the outer surface of the large end 41a against the outer surface of the large end portion 41a.
As the second spring 132 is compressed as it moves closer to the other end of the push pin 128 along the length of 129, the second spring 132 causes the abutment member 127 to move to the larger end. It exerts a spring force to press against the outer surface of the portion 41a.

By the way, the rotation axis 64 of the holding frame 55
The pair of natural lock means 67, 67 arranged symmetrically with respect to are driven in common by the natural lock drive means 136.

The natural lock driving means 136 includes:
A cylinder body 137 that has an axis along the Y-axis direction, is formed in a closed-end cylindrical shape with one end closed, and is supported by the holding frame 55.
A cylinder cap 138 for closing the other end opening of the cylinder body 137; and a piston 139 slidably fitted to the cylinder body 137. The rods 139a, 139a penetrating the one end wall and the cylinder cap 138 fluid-tightly and axially movably are connected to the connecting plates 130, 130 of both natural lock means 67, 67.

In the cylinder body 137, a fifth fluid pressure chamber 140 is formed between one end wall of the cylinder body 137 and the piston 139, and a sixth fluid pressure chamber 141 is formed between the cylinder cap 138 and the piston 139. Is done. Further, the fifth and sixth fluid pressure conduits 142 and 143 extending from the fluid pressure distribution plate 94 of the holding frame 55 are individually connected to the fifth and sixth fluid pressure chambers 140 and 141 and are connected to the cylinder 137. Connected. Therefore, it is possible to switch between the action of the fluid pressure on one of the fifth and sixth fluid pressure chambers 140 and 141 and the release of the fluid pressure from the other of the fifth and sixth fluid pressure chambers 140 and 141, and such fluid The natural lock driving means 136 is controlled by the pressure switching control.
Operates to reciprocate the piston 139 in the Y-axis direction.

Such a natural lock driving means 13
According to No. 6, the natural lock means 67 on the attachment / detachment position SH side of the pair of natural lock means 67, 67 connected to the natural lock drive means 136 is locked, and the natural lock means on the machining position SP side. It is possible to drive both of the natural lock means 67, 67 by setting the unlock state of 67.

An operation detector 144 for detecting the operation position of the connecting plates 130 and detecting the operation state of the natural lock means 67 is attached to the holding frame 55.

A pair of connecting rods 4 in contact with the reference support surfaces 62...
The locking state in which the large end portions 41a of the large diameter portions 42a are positioned by contacting the inner surfaces of the large diameter holes 42 at a plurality of locations in the circumferential direction, and the positioning of the large end portions 41a.
A pair of second switches capable of switching between an unlocked state and a unlocked state.
Positioning means 145, 145 are provided.

Referring to FIGS. 11 to 13 together, the second positioning means 145 includes a rotating arm 146 whose base end is supported by the holding frame 55 so as to be capable of raising and lowering about an axis parallel to the X axis. A cylinder part 147 having a cylindrical shape with a bottom and integrally formed at the tip of the rotating arm 146, a cylinder cap 148 fastened to the cylinder part 147 so as to close an open end of the cylinder part 147, Cylinder part 14
7 and a rod 150 coaxially connected to the piston 149 and penetrating the cylinder cap 148 in a fluid-tight and axially movable manner.
And a first moving piece 151 fixed at an intermediate position of the protruding portion of the rod 150 from the cylinder cap 148, and a first moving piece 151 that can be inserted into the large-diameter hole 42 of the connecting rod 41 so as to be integrated with the first moving piece 151. First clamper 15 to be formed
2 and the rod 150 at a position outside the first moving piece 151.
A second moving piece 153 supported so as to allow the rod 150 to move along the axial direction, and a second moving piece 153 that can be inserted into the large-diameter hole 42 of the connecting rod 41.
And a support plate 155 fastened to the cylinder cap 148.
A rotation link 157 whose intermediate portion is rotatably supported via a shaft 156 perpendicular to the axis of the rotation link 157, and a first link 1 connecting one end of the rotation link 157 and the first moving piece 151.
58, and a second link 159 connecting the other end of the rotation link 157 and the second moving piece 153.

In the cylinder section 147, the cylinder section 14
A seventh fluid pressure chamber 160 is formed between the one end closing wall of the 7 and the piston 149, and an eighth fluid pressure chamber 161 is formed between the piston 149 and the cylinder cap 148.
A seventh fluid pressure conduit 163 communicating with the seventh fluid pressure chamber 160 is connected to the cylinder portion 147, and the cylinder cap 1
Reference numeral 48 denotes an eighth fluid pressure conduit 1 leading to the eighth fluid pressure chamber 161.
64 are connected.

A regulating pin 162 is inserted and fixed to the cylinder cap 148.
Penetrates the rod 150 along one diameter line while allowing the rod 150 to move in the axial direction in a limited range.
Rotation about the axis of 49 is prevented.

In the second positioning means 145, when the rotating arm 146 is in the upright state, the fluid pressure is applied to the seventh fluid pressure chamber 160, and the eighth fluid pressure chamber 16
When the fluid pressure is released from the first and second moving pieces 15,
As shown in FIG. 13A, the first and second clampers 1 and 153 are located close to each other.
2,154 can be inserted into and removed from the large-diameter hole 42.

When the fluid pressure is released from the seventh fluid pressure chamber 160 and the fluid pressure is applied to the eighth fluid pressure chamber 161, the second moving piece 151 moves to the cylinder cap 148 side, and The moving piece 153 is separated from the first moving piece 151, and the first and second clampers 152 and 154 are strongly pressed against the inner surface of the large-diameter hole 42 as shown in FIG. The end 41a will be positioned.

The base ends of the rotating arms 146 and 146 of the second positioning means 145 and 145 are connected to both ends of a connecting cylinder 165 having an axis extending along the X axis at right angles. Inside, a rotation shaft 166 is inserted so as not to rotate relatively. That is, both second positioning means 14
5,145 pivot arms 146,146 are pivot shaft 166
It rotates with it.

Both ends of the rotation shaft 166 are rotatably supported by shaft supports 167 and 168 provided in the holding frame 55, and the rotation shaft 16 is located at a position close to one of the shaft supports 167.
The arm 170 is fixed to 6. On the other hand, a cylinder 169 having an axis orthogonal to the axis of the rotating shaft 166, that is, an axis along the Y-axis direction is provided on the base 45.
And the piston rod 169 a of the cylinder 169 is connected to the arm 170. Therefore, the expansion and contraction operation of the cylinder 169 causes the rotation shaft 16
6 rotates about the axis, and both second positioning means 145,
145 is driven up and down.

When the connecting rod 41 is positioned on the holding frame 55 at the attaching / detaching position SH, the second positioning means 145 sets the rotating arm 146 in an upright state in the circumferential direction of the inner surface of the large-diameter hole 42 of the connecting rod 41. The first and second clampers 152 and 154 are brought into contact with the two places to lock the large end 41a of the connecting rod 41, but the holding frame 55 is rotated by 180 degrees and the connecting rod 41 is rotated.
Before bringing to the machining position SP, that is, before finishing the large-diameter hole 42, the first and second clampers 152 and 154.
Is retracted from the large-diameter hole 42, and the unlocked state is established in which the rotating arm 146 is in the down state so as to release the positioning of the large end 41a.

A pair of guide rails 174 and 174 extending in the X-axis direction are provided on the base 45 on the processing position SP side, and the guide rails 174 and 174 guide the movement in the X-axis direction. First movable table 175
Is disposed above the base 45. The first movable table 175 is screwed with a screw shaft 176 extending in the X-axis direction between the two guide rails 174 and 174 and having one end rotatably supported by the base 45.
A motor 177 with a speed reducer connected to the other end of the base 45 is fixedly supported on the base 45. Therefore, when the screw shaft 176 is driven to rotate by the motor 177 with a speed reducer, the first movable table 175 moves along the X-axis direction.

The processing means 48 includes a spindle 47 having an axis along the Y-axis direction, a drive unit 178 connected to the spindle 47 to enable the spindle 47 to rotate around the axis, and a tip of the spindle 47. The drive unit 178 is fixed to a second movable table 179 disposed above the first movable table 175.

On the first movable table 175, the connecting rod 41 positioned and held in the holding frame 55 at the processing position SP.
A pair of guide rails 180 extending in the direction along the axis of the large diameter hole 42 and the small diameter hole 43 provided in
180 are provided, and the second movable table 179 is
It is movable along those guide rails 180,180. Further, a screw shaft 181 that extends in the Y-axis direction between the two guide rails 180 and 180 and has one end rotatably supported by the first movable table 175 is screwed to the second movable table 179. A motor with a speed reducer 182 connected to the other end of the shaft 181 is fixedly supported on the first movable table 175. Therefore, by rotating the screw shaft 181 with the motor 182 with a speed reducer,
The movable table 179 moves along the Y-axis direction, and the spindle 47 is disposed on the first movable table 175 so that the large-diameter hole 42 and the small-diameter hole 43 of the connecting rod 41 can be advanced and retracted in the axial direction. Is done.

As shown in FIG. 8, the tool 52 has a large-diameter portion 52a for finishing the inner surface of the large-diameter hole 42 in the connecting rod 41 and a finishing process for the inner surface of the small-diameter hole 43 in the connecting rod 41. Small diameter part 52 for application
b, and is formed in a stepped manner, and both inner surfaces of the large-diameter hole 42 and the small-diameter hole 43 are finished by changing the insertion positions of the large-diameter hole 42 and the small-diameter hole 43. Can be applied.

The measuring means 51 includes a pair of inner diameter measuring devices 49 and 50 for individually measuring the inner diameters of the large-diameter hole 42 and the small-diameter hole 43 in the connecting rod 41 after the finishing is completed. Are arranged on a third movable table 183 disposed above the table.

On the first movable table 175, a pair of guide rails 184, 184 extending in the Y-axis direction at positions shifted from the pair of guide rails 180, 180 for guiding the processing means 48 are provided. The third movable table 183 is moved by the guide rails 184 and 184 in the Y-axis direction, that is, the axial direction of the large-diameter hole 42 and the small-diameter hole 43 in the connecting rod 41 held by the holding frame 55 at the processing position SP. To be guided.

The third movable table 183 is screwed with a screw shaft 185 extending in the Y-axis direction between the two guide rails 184 and 184 and having one end rotatably supported by the first movable table 175. The motor 186 with a speed reducer connected to the other end of the screw shaft 185 is connected to the first movable table 1.
75 fixedly supported. Therefore, motor 1 with reduction gear
When the screw shaft 185 is rotationally driven by 86, the third movable table 183 moves along the Y-axis direction, and the inner diameter measuring devices 49 and 50 use the large diameter hole 42 and the small diameter hole 43 in the connecting rod 41. Are arranged on the first movable table 175 so as to be able to advance and retreat in the axial direction.

Referring to FIGS. 14 and 15 together, one inner diameter measuring device 49 is arranged such that when the connecting rod 41 is inserted into the large-diameter hole 42, the large-diameter hole 4
And a plurality of guide portions 49b for guiding the detectors 49a... Into and out of the large-diameter hole 42.
The inner diameter of the large-diameter hole 42 is measured by rotating the two detectors 49a around the axis.

The other inner diameter measuring device 50 includes a pair of detectors 50a which are close to and opposed to the inner surface of the small diameter hole 43 on one diameter line of the small diameter hole 43 when the connecting rod 41 is inserted into the small diameter hole 43. Small diameter holes 43 of the detectors 50a ...
And a plurality of guide portions 50b for guiding insertion / removal of the small diameter hole 43 by rotating both the detectors 50a around the axis.

Incidentally, while the inner diameter measuring device 50 is fixedly arranged on the third movable table 183, the inner diameter measuring device 4
9 is supported on the third movable table 183 so that the distance along the X-axis direction from the inner diameter measuring device 50 can be adjusted.
This makes it possible to simultaneously measure the inner diameters of the large-diameter hole 42 and the small-diameter hole 43 in response to a plurality of types of connecting rods 41 having different intervals between the large-diameter hole 42 and the small-diameter hole 43.

The tool stocker 53 has a disk-shaped rotating body 191 rotatable about an axis parallel to the axis of the spindle 47 provided in the processing means 48, and one end of the processing means 48 in the moving direction along the X-axis direction. Is disposed on the base 45.

Referring to FIGS. 16 to 19 together, the base 4
An index motor 193 having a rotation axis extending in the vertical direction is supported on an upper portion of the column 192 erected on the top 5, and a transmission mechanism () is provided on the upper portion of the column 192 at a position adjacent to the index motor 193. (Not shown) is fixed. From the transmission box 194, a direction parallel to the axis of the spindle 47, ie, Y
An output shaft 195 having an axis extending in the axial direction is projected, and the center of the rotating body 191 is coaxially fastened to the output shaft 195. An input shaft 196 extending vertically extends from the upper end of the transmission box 194, and the transmission mechanism transmits the rotational power input from the input shaft 196 to the output shaft 195 having an axis along the Y-axis direction and the rotating body 191. Power is transmitted so as to be converted into rotational power.

The index motor 193 has a rotating shaft 197 extending vertically, and an endless drive pulley 198 provided at the upper end of the rotating shaft 197 and a driven pulley 199 provided at the upper end of the input shaft 196. The transmission belt 200 is wound. Therefore, the rotating body 191 is index-driven around the axis along the Y-axis direction by the operation of the index motor 193.

The tool 52 is attached / detached to a plurality of locations (e.g., eight locations in this embodiment) except for a specific location out of a plurality of locations at equal intervals in the circumferential direction, for example, 9 locations on the outer peripheral portion of the rotating body 191. Tool gripping means 20 capable of gripping as possible
Are provided, and a spindle cleaning means 202 capable of cleaning the tip of the spindle 47 is provided at the specific location.

By the way, an exchange position SC where the tip of the spindle 47 in the processing means 48 can be disposed outside the rotating body 191 is set, and the index motor 193 is provided with a plurality of tool gripping means 201, 201. And one of the spindle cleaning means 202 is replaced with the exchange position SC.
The rotator 191 is index-driven so as to provide the alternative.

20 to 22, the tool holding means 2
01 is a pair of gripping arms 20 rotatably supported by the rotating body 191 so that the tool 52 can be sandwiched from both sides.
3 and 203, and both gripping arms 20
A spring 204 for urging the two gripping arms 20
Stopper 20 fastened to rotating body 191 between 3, 203
5 is provided.

The base of a pair of support shafts 206, 206 having axes parallel to the rotary body 191 is fixed to the rotary body 191 by bolts 207, 207. Their support shafts 206, 206
Is supported by the rotating body 191 through the shaft. Moreover, each spindle 20
Disc-shaped regulating plates 208, 208 for preventing the gripping arms 203, 203 from being detached from the support shafts 206, 206 are fastened to the distal ends of the holding arms 203, 206 by bolts 209, 209.

One end of both gripping arms 203, 203
Projecting outward from the rotating body 191, the opposite ends of the gripping arms 203, 203 are fitted into annular grooves (not shown) provided in the tool 52 so that the tool 52 is held on both sides. Gripping portions 210, 210 formed in an arc shape so that they can be gripped from the front, and guide portions 211, 211 extending linearly so as to be continuous with one end of the gripping portions 210, 210 are provided. Part 21
Reference numerals 1 and 211 are formed so as to have a trapezoidal cross-sectional shape. Moreover, both guide portions 211 and 211 are
In order to facilitate insertion into and removal from the gripping parts 210, 210, they are formed so as to be inclined away from each other as they separate from the gripping parts 210, 210.

The spring 204 has two gripping arms 203, 20.
3 between the other end portion, the two gripping arms 203,
203 is a direction in which the other ends of the gripping arms 203, 203 are separated from each other, that is, both gripping portions 210, 21
At 0, it is urged by the spring 204 in a direction to grip the tool 52.

The stopper 205 is provided with a pair of bolts 212,
At 212, it is fastened to the rotating body 191, and the insertion end of the tool 52 between one ends of the gripping arms 203, 203 is regulated by the stopper 205. Also, on both sides of the stopper 205, the two gripping arms 20 urged by the spring 204 are provided.
The two gripping arms 203,
Restricting projections 205a, 205 that can abut on one side surface
05a is integrally provided.

Paying particular attention to FIGS. 17 and 19, the spindle cleaning means 202 includes a support plate 2 which is fastened to the rotating body 191 so that a part of the spindle cleaning means 202 extends outside the rotating body 191.
And a cleaning tool 213 having a bottomed insertion hole 214 into which the tip of the spindle 47 can be inserted and fastened to the outer end of the support plate 212.

The cleaning tool 213 is provided with a plurality of air ejection holes 215 that are opened on the inner surface of the insertion hole 214, and the air passages 21 communicating with the air ejection holes 215 are provided.
6 is provided on the cleaning tool 213, the support plate 212, the rotating body 191 and the output shaft 195, and compressed air can be supplied to the air passage 216 from a compressed air source (not shown).

In the state where the spindle cleaning means 202 is arranged at the exchange position SC, the spindle 47 without the tool 52 is brought to the exchange position SC and advanced in the Y-axis direction. When the compressed air is supplied to the air passage 216 with the tip of the spindle 47 inserted, the tip of the spindle 47 is cleaned by the compressed air ejected from the air ejection holes 215. It is possible to remove chips, cutting oil and the like adhering to the surface.

By the way, in the rotating body 191, the transmission box 1
A plurality of virtual circles 232... Centering on the rotation axis of the rotating body 191 and having different radii are set on the surface on the 94 side, and the rotating bodies 191 are set on the virtual circles 232.
, The detection pins 233 are implanted. Moreover, the plurality of detected pins 233 are spaced at equal intervals in the circumferential direction of the virtual circles 232 set between the tool gripping means 201 and the spindle cleaning means 202 in the circumferential direction. The rotating body 191 is selected at a plurality of selected locations.
And a rotating body 191 from the support 192.
Each of the detection pins 233...
Is provided.

Any of the plurality of tool gripping means 201... And the spindle cleaning means 202
Can be confirmed by a combination of detected pins 233 for each virtual circle 233 detected by the pin detector 235.

The tool stocker 53 is provided with a tool cleaning means 241 capable of cleaning the rear part of one of the plurality of tools 52 stocked in the tool stocker 53, that is, the mounting portion to the spindle 47.

Paying particular attention to FIGS. 16 and 17, the tool cleaning means 241 includes a cleaning tool 242 disposed on the side opposite to the transmission box 194 and opposed to the rotating body 191, and a rotating tool 242. The cleaning tool 242 is disposed on the opposite side of the body 191 and has an axis along the Y-axis direction.
And a cylinder 243 having a piston rod 243a connected to the cylinder 243.

The cylinder 243 is fixedly disposed on a support 244. The support 244 is fixed to a support frame 245 extending laterally from the support 192 so as to extend upward from the tip of the support frame 245. Is done.

The surface of the cleaning tool 242 facing the rotating body 191 has a bottomed insertion hole 2 into which the rear part of the tool 52 can be inserted.
46 are provided, and a plurality of air ejection holes 247, 247... Opening on the inner surface of the insertion hole 246 are provided, and the air supply pipe 248 that is commonly connected to the air ejection holes 247, 247. The compressed air can be supplied to the air supply pipe 248 from a compressed air source (not shown).

When one of the plurality of tools 52 in the tool stocker 53 and one of the spindle cleaning means 202 are brought to the exchange position SC, the tool cleaning means 241 extends along the circumferential direction of the rotating body 191. Replacement position S
The cleaning tool 242 is advanced to the tool 52 side by the cylinder 243, and the rear end of the tool 52 is inserted into the insertion hole 246. Is supplied from the air supply pipe 248 to each of the air ejection holes 247, 247, and is ejected and ejected, so that the rear part of the tool 52 can be cleaned and adhered to the rear part of the tool 52. It is possible to remove swarf chips, cutting oil and the like.

In FIG. 23, a cam clamp mechanism 218 capable of switching between a clamp state for clamping the tool 52 and an unclamping state for releasing the clamp state of the tool 52 is provided at the tip of the spindle 47.

The cam clamp mechanism 218 has a support 219 mounted on the tip of the spindle 47 so that rotation around the axis and movement in the axial direction are disabled, and an intermediate portion of the support 219 perpendicular to the axis of the spindle 47. A clamp bolt 220 rotatably supported with an axial line and having external threads 221 and 222 respectively engraved on the outer surfaces of both ends, and a support member which disables rotation around the axis but allows movement in the axial direction. Nut 223 supported on the screw 219 and screwed into the male screws 221 and 222
224.

At the tip of the spindle 47, the nut 2
Cylindrical portion 225 surrounding the portion where 23 and 224 are arranged
Are provided integrally, and an inner surface 225 of the cylindrical portion 225 is provided.
a is formed in a tapered shape having a larger diameter toward the tool 52 side. On the other hand, at the rear end of the tool 52, a cylindrical insertion tube portion 226 having a tapered outer surface corresponding to the inner surface 225a of the cylindrical portion 225 is formed.
The support 219 is coaxially provided with a recess 227 into which the distal end of the support 219 can be inserted. Moreover, fitting recesses 228, into which the nuts 223, 224 can be fitted, respectively, are provided on the inner surface of the insertion tube portion 226.
228 are provided.

The cylindrical portion 225 at the tip of the spindle 47 has insertion holes 229 and 22 coaxial with the clamp bolt 220.
9 is provided, and the insertion cylindrical portion 226 at the rear end of the tool 52 includes:
When the insertion tube portion 226 is inserted into the cylindrical portion 225, the insertion holes 230, 230 connected to the insertion holes 229, 229
Is provided.

Engagement holes 220a and 220 are provided on both end surfaces of the clamp bolt 220 so that the tip of the wrench 236 can be engaged.
As shown in FIG. 23A, a wrench 236 inserted through one set of insertion holes 229 and 230 with the insertion tube portion 26 inserted into the cylindrical portion 225 is inserted into one engagement hole as shown in FIG. When the nuts 223 and 224 are rotated in the forward direction by engaging with the nuts 223 and 224,
Move in the directions away from each other to fit into the fitting recesses 228, 22.
8, the cam clamp mechanism 218 is in a clamped state, and the tool 52 is mounted on the tip of the spindle 47.

When the wrench 236 inserted into the one pair of insertion holes 229 and 230 is engaged with the one engagement hole 220a and rotated in the opposite direction in the clamped state, FIG.
As shown in (b), the two nuts 223 and 224 move in the direction approaching each other due to the reverse rotation of the clamp bolt 220 and are separated from the fitting recesses 228 and 228, so that the cam clamp mechanism 218 is in the unclamped state. Thus, the tool 52 can be removed from the tip of the spindle 47.

One 223 of the nuts 223 and 224
Is provided with a cam surface 223a.
An extrusion pin 231 having one end abutting on 23a is held at the tip of the support 219 so as to be movable in the axial direction, and the other end of the extrusion pin 231 closes the recess 227 at the rear end of the tool 52. It can abut the end. Thus, the cam surface 223a is provided with the nut 22 when the cam clamp mechanism 218 changes from the clamped state to the unclamped state.
The pushing pin 231 is formed so as to press the pushing pin 231 forward, that is, toward the tool 52 by the movement of the tool 3, and the tool 52 is pushed in a direction away from the spindle 47 by the pushing pin 231 in the unclamped state.

24 to 26, the tool attaching / detaching unit 54 has a movable body 250 capable of reciprocating in a direction orthogonal to the rotation axis of the spindle 47 at an exchange position SC where the cam clamp mechanism 218 of the spindle 47 can be provided.
A cylinder 251 serving as moving body driving means for reciprocatingly driving the moving body 250; a rotating shaft 252 supported by the moving body 250 so as to be rotatable around an axis orthogonal to the rotation axis of the spindle 47; A wrench 23 whose base end is coaxially connected to one end of the rotary shaft 252 by disabling relative rotation about the axis of the rotary shaft 252 and enabling relative movement within a limited range in the axial direction of the rotary shaft 252.
6, a spring 253 contracted between the base end of the wrench 236 and one end of the rotary shaft 252, and the rotary shaft 252 is driven to rotate in either the forward or reverse direction regardless of the moving position of the moving body 250. And a nut runner 254 as a rotating shaft driving means that can be used.

On the support frame 245, a support plate 255 is provided which is parallel to a plane including the rotation axis of the spindle 47 at the exchange position SC and the rotation axis of the rotating body 191 in the tool stocker 53. On the support plate 255, the rod support member 256 and the regulating member 257 are fixed at intervals in a direction orthogonal to the rotation axis of the spindle 47 at the exchange position SC. The cylinder 251 is disposed on the support plate 255 between the rod support member 256 and the regulating member 257, and a pair of piston rods 258, 258 provided in the cylinder 251 are fixed to the rod support member 256. Therefore, the cylinder 251 moves in a direction orthogonal to the rotation axis of the spindle 47 at the exchange position SC in accordance with the expansion and contraction operation, and the moving end of the cylinder 251 on the side close to the spindle 47 is controlled by the regulating member 257. Be regulated.

The moving body 250 is fixed to the cylinder 251 and moves together with the cylinder 251 in a direction orthogonal to the rotation axis of the spindle 47 according to the expansion and contraction operation of the cylinder 251.

The nut runner 254 is connected to the cylinder 2
51 and a rotation axis parallel to the moving direction of the moving body 250 are fixedly arranged on the support plate 255. The support plate 25 is supported so as to support one end of the nut runner 254.
5, the nut runner 2
A shaft support member 260 that supports the 54 output shafts 261 is fastened. The rotating shaft 252 is rotatably supported by the moving body 250 so as not to move in the axial direction, and one end of the rotating shaft 252 protrudes from the moving body 250 toward the spindle 47 at the exchange position SC.

A drive gear 262 is fixed to the output shaft 261 of the nut runner 254, and an idle gear 263 meshing with the drive gear 262 is rotatably supported by the support member 259. A driven gear 264 meshing with the idle gear 263 is fixed to the other end of the rotating shaft 252.
Moreover, the driven gear 263 maintains the meshing state of the idle gear 263 regardless of the movement of the moving body 250,
The idle gear 263 is formed to have a width larger than the width along the axial direction of the idle gear 263. Therefore, the nut runner 254 can drive the rotating shaft 252 to rotate in both forward and reverse directions regardless of the moving position of the moving body 250.

The base end of the wrench 263 is fixed to the connecting member 265, and one end of the rotating shaft 252 allows a limited relative movement in the axial direction, but disables the relative rotation about the axis. 265 and a spring 253
Is a connecting member 26 fixed to the base end of the wrench 236.
5 and one end of the rotating shaft 252. That is, the one end of the rotating shaft 252 is provided with a wrench 236 at the base end thereof, which disables relative rotation about the axis of the rotating shaft 252 and enables relative movement within a limited range in the axial direction of the rotating shaft 252. Will be coaxially connected to the
The spring 253 exerts a spring force for urging the wrench 236 toward the spindle 47 at the exchange position SC.

Such a wrench 263 and the rotating shaft 25
According to the connection structure of FIG. 2, when the rotary shaft 252 is advanced toward the spindle 47 to switch between the clamped state and the unclamped state of the cam clamp mechanism 218 provided at the distal end of the spindle 47, the insertion holes 229, 2
When the tip of the wrench 236 inserted into the clamp 30 is engaged with the clamp bolt 220, the spring 253 is not compressed and the connecting member 265 advances to a predetermined position. When the connecting member 265 cannot be engaged with the
3 is stopped at a position shifted from the predetermined position while compressing. Therefore, by detecting the position of the connecting member 265, the tip of the wrench 236 is
Can be detected as to whether or not the rotation shaft 252 of the detected flange 265a provided on the connecting member 265 is engaged.
State detector 26 for detecting an axial relative position with respect to
7 is attached to a stay 269 fixed to the instrument support plate 268 as shown in FIG. Thus, instrument support plate 2
68 is fixed to the support plate 255.

At a position corresponding to the idle gear 263, a rotation speed detector 270 is mounted on the instrument support plate 268, and the rotation speed detector 270
By detecting a plurality of, for example, a pair of protrusions 271 and 271 protruding from the surface on the side of the rotation speed detector 270, the rotation speed of the wrench 236 in the reverse rotation direction for setting the cam clamp mechanism 218 in the unclamped state is detected. I do.

The nut runner 254 is provided with a torque detector 272 for detecting the rotation torque of the nut runner 254 in the normal rotation direction for bringing the cam clamp mechanism 218 into a clamped state.

At a position adjacent to the exchange position SC, a shake detector 275 is mounted on the instrument support plate 268, and the spindle 47 is rotationally driven while the shake detector 275 is in contact with the outer periphery of the spindle 47. Accordingly, the shake of the tool 52 newly attached to the tip of the spindle 47 at the exchange position SC is detected by the shake detector 275.

In FIG. 28, the spindle 47 is provided with a correcting means 277 capable of adjusting the position of the tool 52 along the radial direction of the spindle 47.
The operation of 77 is controlled by the air pressure adjusted by correction controller 278.

The detection value of the shake detector 275 is input to the control means 276, and the control means 276 controls the operation of the correction controller 278, that is, the operation of the correction means 277, based on the detection value of the shake detector 275. In controlling the operation of the correcting means 277, the control means 276 activates the correcting means 277 when the number of times the amount of runout of the tool 52 exceeds the first set range becomes equal to or more than the set number of times. The operation of the correction controller 278 is controlled to adjust the position of the tool 52 along.

The control means 276 controls the tool stocker 5
3. Tool attachment / detachment unit 54, spindle cleaning means 202
The operation of the tool cleaning means 241 can also be controlled. For example, when it is detected by the shake detector 275 that the shake amount of the tool 52 exceeds a second set range that is larger than the first set range, The control unit 276 operates the tool stocker 53, the tool attachment / detachment unit 54, the spindle cleaning unit 202, and the tool cleaning unit 241 so that the spindle cleaning unit 202 cleans the spindle 47 or the tool cleaning unit 241 cleans the tool 52. It is controlled by the control means 276.

Further, in controlling the operation of the tool attaching / detaching unit 54 for executing attachment / detachment of the tool 52 to / from the spindle 47, the control means 276 controls the operation of the cylinder 251 and the nut runner 254 provided in the tool attaching / detaching unit 54 by the engagement state Control is performed based on the detection values of the detector 267, the rotation speed detector 270, and the torque detector 272.

Next, the operation of the present embodiment will be described.
A first positioning means 65 capable of switching between a locked state for positioning 1b and an unlocked state in which the positioning of the small end portion 41b is released and retracted from the small diameter hole 43 when finishing the small diameter hole 43; The large end portion 41a is brought into contact with a plurality of circumferential positions on the inner surface of the diameter hole 42 and
And a second positioning means 145 capable of switching between a locked state for positioning the large-diameter hole 42 and an unlocked state in which the positioning of the large end 41a is released and retracted from the large-diameter hole 42 when finishing the large-diameter hole 42. , First and second
The positioning means 65 and 145 are respectively in contact with a plurality of locations on the inner surface of the small diameter hole 43 and the large diameter hole 42 to contact the small end 41b.
And the large end 41a, the connecting rod 4
The connecting rod 41 having the large end portion 41a and the small end portion 41b abutted on the reference support surfaces 62 and 63 can be accurately positioned even if 1 is in the black skin state. Moreover, the positioning and holding device 46 connects the connecting rod 41 to the reference support surface 6.
Since it is provided with a clamp means 66 which can press the connecting rod 41 to the holding frame 55 by pressing the connecting rod 41 to the sides 2 and 63,
The connecting rod 41 in the accurate positioning state by the first and second positioning means 65 and 145 is clamped by the clamping means 66.
Can be held in the holding frame 55.

The positioning / holding device 46 is in a state in which the outer surface of the large end portion 41a can be detachably operated by human power and is resiliently held, and a state in which the outer surface of the large end portion 41a is fixedly held. It is possible to reduce the load on the worker by resiliently holding the large end 41a by the natural lock means 67 when the connecting rod 41 is positioned, When the connecting rod 41 is subjected to a finishing process, the connecting rod 41 is subjected to the action of the force accompanying the processing.
Can be prevented by the natural lock means 67.

.., The first positioning means 65, 65, and the clamping means 66, 66,.
And the natural locking means 67, 67...
5 are arranged symmetrically with respect to the horizontal rotation axis 64, and are provided on the side face facing the mounting / detaching position SH of the holding frame 55 and the side face facing the processing position SP. Therefore, on the side of the attachment / detachment position SH, the natural lock means 67 in the unlocked state are provided.
, While the large end portions 41a are resiliently held by the first and second positioning means 65, 145,.
and the large end 41a are positioned on the reference support surfaces 62, 63, so that the small end 41b.
The connecting rods 41 with which a... abut can be positioned. Also, the first and second positioning means 65
, 145 ..., the connecting rods 41, 41 can be fixedly held on the holding frame 55 by the clamping means 66.
After the holding of the connecting rods 41 by the second positioning means 145, the holding frame 55 can be rotated 180 degrees to bring the connecting rods 41 to the processing position SP.

On the other hand, at the processing position SP, the clamping means 6
In the state where the connecting rod 41 is held in the holding frame in 6.
By setting the positioning means 65 in the unlocked state, it is possible to perform finishing of the small diameter holes 43 and the large diameter holes 42.
The displacement of the connecting rods 41 due to the force acting on the connecting rods 41 can be prevented by the locked natural lock means 67. Moreover, when the connecting rods 41, 41 are being processed at the processing position SP, the connecting rods 41, 41 after the processing are completed at the attaching / detaching position SH.
The removal of the connecting rod 41 from the holding frame 55 and the positioning and holding of the new connecting rods 41, 41 on the holding frame 55 can be performed, and the time required for attaching and detaching the connecting rod 41 in a series of processing cycles of the connecting rod 41 is set as the loss time. Therefore, the worker can easily attach and detach the connecting rod 41, and the equipment cost can be reduced by enabling the worker to attach and detach the connecting rod 41.

Further, one of the first positioning means 65 at the attaching / detaching position SH is locked and the processing position SP is set.
The first first positioning means 65..
The positioning means 65, 65...
7, the one natural lock means 67 at the attachment / detachment position SH is unlocked, and the other natural lock means 67 at the processing position SP is locked. Since the symmetric natural lock means 67 are driven by the common natural lock drive means 136, the number of parts can be reduced.

Further, the clamping means 66 is capable of raising and lowering the holding frame 55 about an axis parallel to the horizontal rotation axis 64 of the holding frame 55 so that the clamp arm 100 is supported by the holding frame 55.
The clamp means 66 and a clamp driving cylinder 102 connected to the other end of the clamp arm 100 to drive the clamp arm 100 up and down are provided at one end of the clamp arm. ,
At the attachment / detachment position SH, the clamper 101 is located above the clamp driving cylinder 102, and at the processing position SP, the clamper 100 is located below the clamp driving cylinder 102, and is provided on the holding frame 55. For this reason, on the processing position SP side, chips generated by the processing are generated by the clamp arm 100 and the clamp driving cylinder 1.
It is possible to prevent accumulation on the 01 side as much as possible, and it is possible to suppress the occurrence of trouble due to chips.

A plurality of steel balls 70 are held at one end of a holder 69 inserted into the small-diameter hole 43 of the connecting rod 41, and a tapered surface 71a of a tapered pin 71 inserted into the holder 69 for relative movement in the axial direction. When the steel balls 70 are pushed up, the steel balls 70.
Positioning means 6 configured to contact the inner surface of the
In 5, the guide member 68 is detachably fixed to the holding frame 55, and the holder driving body 81, which cannot rotate around the axis of the small-diameter hole 43, moves the holder 69 relative to the holder driving body 81 in the axial direction. In which the holder 69 is rotated relative to the holder driver 81 about the axis by a set amount from the connected state, and the connected state is released by releasing the holder 69. And a pin driver 89 is coaxially abutted on the other end of the tapered pin 71.

Therefore, the guide member 68 and the holder 69 guided by the guide member 68 to reciprocate in the axial direction.
, A plurality of steel balls 70 held by the holder 69, and a tapered pin 71 inserted into the holder 69 so as to be capable of relative movement in the axial direction, are prepared as one unit for each type of the connecting rod 41. By doing so, the unit can be easily and promptly replaced according to the type change of the connecting rod 41. That is, by rotating the holder 69 around the axis in a state where the guide member 68 is not fixed to the holding frame 55, the connection and disconnection of the holder 69 with the holder driving body 81 can be easily and quickly switched. When the holder 69 is connected to the holder driving body 81, the pin driving body 89 is coaxially abutted on the tapered pin 71 so that the tapered pin 71 with the pin driving body 89 is contacted.
Can be easily and promptly switched.

In addition, the guide member 68 and the holder 69
Between them, a rotation preventing means 76 for preventing the holder 69 connected to the holder driving body 81 from rotating around the axis.
The rotation preventing means 76 prevents the holder 69 from rotating around the axis, so that the guide member 68 is fixed to the holding frame 55 so that the holder driving body 81 and the holder 69 can be rotated. The connection state can be reliably maintained, and accordingly, the connection state due to the contact between the pin driver 89 and the tapered pin 71 can be reliably maintained.

At the processing position SP, a pair of connecting rods 41,
41 are supported by the holding frame 55 side by side in the X-axis direction,
While moving the first movable table 175 in the X-axis direction, the processing means 4 disposed on the first movable table 175
It is possible to move a single spindle 47 provided in 8 in the axial direction. In addition, the tool 52 mounted on the tip of the spindle 47 finishes the inner surface of either the large-diameter hole 42 or the small-diameter hole 43 by changing the position of insertion into the large-diameter hole 42 and the small-diameter hole 43 in the connecting rod 41. This is a composite tool that can be applied and is formed with a step. Therefore, it is possible to finish the inner surfaces of the large-diameter holes 42 and the small-diameter holes 43 provided in each of the connecting rods 41 with the tool 52 mounted on the tip of the spindle 47, and the type of the connecting rod 41 changes. In such a case, the problem can be dealt with only by changing the tool 52, and it is possible to easily cope with a change in the type of the connecting rod 41.

The measuring means 51 includes the first movable table 1
The large diameter hole 42 and the small diameter hole 4 in the connecting rod 41 are shifted from the spindle 47 on the
The advancing / retreating operation in the direction along the axis 3 is performed by the spindle 47
The large-diameter hole 42 and the small-diameter hole after the completion of the finishing of the other connecting rod 41 when the finishing of a certain connecting rod 41 is performed by the tool 52 when the finishing is performed on the certain connecting rod 41 by the tool 52 It is possible to measure the inner diameter of the connecting rod 43 using a large loader.
Compared with the conventional apparatus which transports the apparatus 1 to the measuring station, the time until the completion of the measurement can be shortened and the equipment cost can be reduced by eliminating the need for a large loader.

The tool stocker 53 comprises: a rotating body 191 rotatable about an axis parallel to the axis of the spindle 47;
A tool gripping means 20 which is disposed at each of a plurality of remaining locations except for a specific location among a plurality of locations equally spaced in the circumferential direction of the rotating body 191 and which can grip the tool 52 detachably.
,..., The tip of the spindle 47 can be cleaned, and the spindle cleaning means 202 disposed at the specific one position of the rotating body 191, and the tool gripping means 201, and the spindle cleaning means 202 are switched to the exchange position SC. Motor 1 that drives rotating body 191 in such a way that
93. Therefore, by moving the tip of the spindle 47 to the exchange position SC, one of the plurality of tools 52 stocked in the tool stocker 53 is selected and mounted on the tip of the spindle 47. Tool 52 removed from tip
Can be newly stored in the tool stocker 53, and when the tip of the spindle 47 is dirty, the tip of the spindle 47 is automatically cleaned by bringing the spindle cleaning means 202 to the replacement position SC. When the rear part of the tool 52 is dirty, the rear part of the tool 52 can be automatically cleaned by bringing the dirty tool 52 to a position corresponding to the tool cleaning means 241.

The spindle 47 includes the spindle 4
Correction means 277 for adjusting the position of the tool 52 along the radial direction of the spindle 7 is provided, and the removal of the tool 52 from the tip of the spindle 47 and the attachment of a new tool 52 to the tip of the spindle 47 at the exchange position SC. Is executed by the operation of the tool attachment / detachment unit 54, and the tool 5 newly attached to the tip of the spindle 47 at the exchange position SC
2 is detected by a shake detector 275. In addition, the tool stocker 53 has a tool cleaning means 241 capable of cleaning a portion of one of the plurality of tools 52 held by the tool stocker 53 on the spindle 47, and a tip end of the spindle 47 capable of cleaning. And a spindle cleaning means 202 attached thereto, and the correction means 2 based on the detection result of the shake detector 275 after the tool exchange at the exchange position SC.
77 for adjusting the position of the tool 52 or the tool cleaning means 2
Cleaning by 41 and the spindle cleaning means 202 is performed.

Therefore, the spindle 47 is moved to the exchange position SC.
The tool 52 detached from the spindle 47 by the tool attachment / detachment unit 54 while the tool 52 is moved is newly held in the tool stocker 53, and one of the plurality of tools 52 stocked in the tool stocker 53 is moved to the exchange position SC. In this state, a new tool can be mounted on the tip of the spindle 47 by the tool attaching / detaching unit 54. In addition, when the shake detector 275 detects the shake of the tool 52 after the replacement of the tool 52, and determines that the shake is large enough to cope with the correction by the correction means 277, the correction means 277 is operated and the spindle 47 is rotated. The position of the tool 52 along the radial direction can be adjusted, and when it is determined that the shake is large enough to be difficult to correct with the correction by the correction means 277, bites such as chips are generated. Then, the tool 52 is removed from the spindle 47, and the tool cleaning means 241 and the spindle cleaning means 202 are operated to clean the mounting portion of the tool 52 to the spindle 47 and to clean the tip of the spindle 47. Thereafter, the replacement of the tool 52 is performed again, so that a new tool 52 can be accurately mounted on the tip of the spindle 47. As described above, since the tool 52 is automatically changed while confirming the mounting accuracy of the tool 52 to the tip of the spindle 47,
The tool 52 can be automatically replaced while avoiding a decrease in finishing accuracy.

The tool attachment / detachment unit 54 includes a movable body 250 capable of reciprocating in a direction orthogonal to the rotation axis of the spindle 47 at an exchange position SC where the cam clamp mechanism 218 of the spindle 47 can be provided. A driving cylinder 251, a rotation shaft 252 supported by a moving body 250 by allowing rotation about an axis orthogonal to a rotation axis of the spindle 47, and a relative rotation about the rotation axis of the rotation shaft 252 being disabled and A wrench 2 whose base end is coaxially connected to one end of the rotating shaft 252 by enabling relative movement within a limited range in the axial direction of the shaft 252.
36, a spring 253 contracted between the base end of the wrench 236 and one end of the rotary shaft 252, and the rotary shaft 252 is driven to rotate in both forward and reverse directions regardless of the moving position of the moving body 250. And a nut runner 254 which can be engaged with the clamp bolt 220 of the cam clamp mechanism 218 at the tip of the spindle 47.

Further, whether or not the tip of the wrench 236 is engaged with the clamp bolt 220 is determined by the relative position of the rotary shaft 252 and the wrench 236 in the axial direction.
7, the rotational speed of the wrench 236 in the reverse direction is detected by the rotational speed detector 270, and the output torque of the nut runner 254 in the normal direction is detected by the torque detector 272.
The operation of the cylinder 251 and the nut runner 254 is controlled by the control unit 276 based on the detection results of the engagement state detector 267, the rotation speed detector 270, and the torque detector 272.

According to such a tool attachment / detachment unit 54, when removing the tool 52 from the tip of the spindle 47, first, the cam clamp mechanism 218 at the tip of the spindle 47 is brought to the exchange position SC. 25
1, the moving body 250 is moved to the cam clamp mechanism 218 side, and the tip of the wrench 236 is
The cam clamp mechanism 218 can be brought into the unclamped state by engaging the nut runner 254 in the reverse direction by engaging the nut runner 254 in the reverse direction. At this time, the wrench 23
6 does not engage with the clamp bolt 220, the relative position of the rotary shaft 252 and the wrench 236 in the axial direction changes while compressing the spring 235, so that it is detected by the engagement state detector 267. With the wrench 23
6 can be confirmed to be securely engaged with the clamp bolt 220, and after confirming that the wrench 236 has been engaged with the clamp bolt 220, the nut runner 254 is operated in the reverse direction to thereby provide a cam clamping mechanism. 21
8 can be in an unclamped state. Thus, when the rotation speed detector 270 detects a predetermined rotation speed, the operation of the nut runner 254 is stopped, and the moving body 250 is moved by the cylinder 251 in a direction away from the cam clamp mechanism 218. The wrench 236 is disengaged from the clamp bolt 220 and the wrench 2
36 is separated from the cam clamp mechanism 218.

When the tool 52 is newly mounted on the tip of the spindle 47, the moving body 250 is moved to the cam clamp mechanism 218 at the replacement position SC, and the wrench 2 is moved.
After the engagement of the tip of the wrench 236 with the clamp bolt 220 is detected by the engagement state detector 270, the nut runner 254 is operated in the normal rotation direction. Thus, the cam clamp mechanism 218 can be brought into the clamped state. When the torque detector 272 detects a predetermined torque, the operation of the nut runner 254 is stopped and the moving body 250 is moved by the cylinder 251 to the cam clamp mechanism 2.
By moving the wrench 236 away from the cam clamp mechanism 218, the wrench 236 is disengaged from the clamp bolt 220.

In this manner, the cam clamp mechanism 218
It is possible to automatically switch between the clamp state and the unclamped state, and the tool 52 can be automatically attached to and detached from the distal end of the spindle 47.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0133]

As described above, according to the present invention, the tip of the wrench is engaged with the clamp bolt by the driving of the moving body in the axial direction by the moving body driving means and the rotation of the rotating shaft by the rotating shaft driving means. The cam clamp mechanism can be switched between a clamped state and an unclamped state, and a predetermined number of rotations of the rotating shaft driving means in the reverse rotation direction when the wrench is engaged with the clamp bolt and the cam clamp mechanism is brought into the unclamped state Is detected by the rotation speed detector, and the torque in the normal rotation direction of the rotating shaft driving unit when the cam clamp mechanism is brought into the clamped state is detected by the torque detector, so that the operation of the moving body driving unit and the rotating shaft driving unit is performed. Can be automatically controlled, and the clamp state and the unclamped state of the cam clamp mechanism are automatically switched, thereby Automatic loading and unloading of the tool Dollar tip portion becomes possible.

[Brief description of the drawings]

FIG. 1 is an overall side view of a machine tool.

FIG. 2 is a plan view as viewed in the direction of arrow 2 in FIG.

FIG. 3 is a front view as viewed in the direction of arrow 3 in FIG. 1;

FIG. 4 is a rear view as viewed in the direction of arrow 4 in FIG. 2;

FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 2;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 5;

FIG. 8 is a sectional view taken along line 8-8 in FIG. 5;

FIG. 9 is an enlarged sectional view taken along line 9-9 of FIG.

FIG. 10 is an enlarged sectional view taken along line 10-10 of FIG. 9;

FIG. 11 is an enlarged sectional view of the second positioning means, taken along line 11-11 of FIG. 5;

FIG. 12 is a sectional view corresponding to FIG. 11 of the second positioning means in an unlocked state.

FIG. 13 is a sectional view taken along line 13-13 of FIG. 11 for explaining the locking operation of the second positioning means.

FIG. 14 is a cross-sectional view corresponding to FIG. 8 in a measurement state by a measurement unit.

FIG. 15 is a view taken in the direction of arrows 15-15 in FIG. 14;

FIG. 16 is an enlarged view as viewed in the direction of arrow 16 in FIG. 2;

FIG. 17 is a cutaway side view as seen from the direction of arrows 17-17 in FIG. 16;

FIG. 18 is a sectional view taken along line 18-18 of FIG. 17;

19 is a view taken in the direction of arrows 19-19 in FIG. 17;

20 is an enlarged view of a portion indicated by an arrow 20 in FIG.

FIG. 21 is a sectional view taken along line 21-21 of FIG. 20;

FIG. 22 is a sectional view taken along line 22-22 of FIG. 20;

FIG. 23 is a cross-sectional view showing a cam clamp mechanism at the tip of the spindle.

FIG. 24 is a sectional view taken along line 24-24 of FIG. 16;

FIG. 25 is a sectional view taken along line 25-25 of FIG. 24;

26 is a view taken in the direction of arrows 26-26 in FIG. 24.

FIG. 27 is an enlarged sectional view taken along line 27-27 of FIG. 24;

FIG. 28 is a diagram showing a control system.

[Explanation of symbols]

 47 Spindle 52 Tool 218 Cam clamp mechanism 220 Clamp bolt 236 Wrench 250 Moving body 251 Cylinder as moving body driving means 252 Rotation Shaft 253: Spring 254: Nut runner as rotating shaft driving means 267: Engagement state detector 270: Rotation speed detector 272: Torque detector 276: Control means SC ..Replacement position

Claims (1)

[Claims] 1. A cam clamp mechanism (218) having a clamp bolt (220) rotatable about an axis orthogonal to a rotation axis of a spindle (47) by rotating the clamp bolt (220) in a forward direction. The clamping state of the tool (52) and the tool (5) by rotating the clamp bolt (220) in the opposite direction.
In the machine tool provided at the tip of the spindle (47) so that the unclamping state of 2) can be switched, the spindle (4) can be switched at an exchange position (SC) that can provide a cam clamping mechanism (218) of the spindle (47).
7) a moving body (250) capable of reciprocating movement in a direction orthogonal to the rotation axis; a moving body driving means (251) for reciprocatingly driving the moving body (250); and the spindle (47).
A rotation shaft (252) supported by the moving body (250) to enable rotation about an axis orthogonal to the rotation axis of the rotation body;
The relative rotation of the rotary shaft (252) about the axis thereof is disabled, and the relative rotation of the rotary shaft (252) in a limited range in the axial direction is enabled.
2) a wrench (23) having a base end coaxially connected to one end thereof and capable of engaging a tip end with the clamp bolt (220);
6) and; a spring (253) contracted between the base end of the wrench (236) and one end of the rotating shaft (252);
A rotating shaft driving means (254) capable of driving the rotating shaft (252) to rotate in both forward and reverse directions regardless of the moving position of the moving body (250); the rotating shaft (252) and the wrench ( The tip of the wrench (236) is connected to the clamp bolt (2) in accordance with the axial relative position of the wrench (236).
20) An engagement state detector (2) for detecting whether or not
67); a rotation speed detector (270) for detecting the rotation speed of the wrench (236) in the reverse rotation direction; and a torque detector (272) for detecting the output torque of the rotation shaft driving means (254) in the normal rotation direction. The engagement state detector (267);
Control means (276) for controlling operations of the moving body drive means (251) and the rotation axis drive means (254) based on the detection results of the rotation speed detector (270) and the torque detector (272); A tool changing device for a machine tool, comprising: