JPS6176252A - Cover device in machine tool - Google Patents

Abstract

PURPOSE:To make tool changing time reducible without setting a control unit, by utilizing the turning force of a swivel body having a tool changing arm, and making one side of door members opening or closing a window part swivel in the same direction of the swivel body but the other side in the reverse direction, respectively. CONSTITUTION:A swivel body 23 swivels counterclockwise from a first position P1 at the side of a tool magazine and further swivels by 90 deg. up to a second position P2 at the side of a spindle head. And, a wire rope 45 is wound up by a pulley 42, while a pulley 41 rotates by 135 deg. clockwise, and a second door member 33 swivels from a closing position to an opening position. And reversely, when the swivel body 23 swivels from the second position P2 at the spindle head side to the first position P1 at the tool magazine side, a wire rope 46 is rewound by the pulley 42 whereby the pulley 41 swivels counterclockwise and the second door member 33 turns round from the opening position to the closing position. Thus, simultaneously with swivel starting of the swivel body, a pair of door members are able to be opened or closed, shortening the tool changing time, and a control unit is no longer required so that its structure is simplified.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a system for moving a revolving body having a tool changing arm attached to its tip between a first position on the tool magazine side and a second position on the spindle head side. The present invention relates to a cover device for a machine tool, which is rotatably supported and is configured to change tools by rotating the rotating body between the first position and the second position and rotating the tool changing arm.

<Prior art> In order to prevent cutting fluid and chips from scattering, a machining center is provided with a cover device that surrounds the outer periphery of the workpiece table and spindle head. Conventionally, a part of the cover is cut out to form a window because the exchange arm and the rotating body with the tool exchange arm attached to the tip cannot move between the tool magazine and the spindle head for tool exchange. This makes it possible to pass through the tool exchange arm and the revolving body, and a movable door that is opened and closed by a cylinder is provided in this window so that the door is opened and closed in synchronization with the tool exchange operation.

In such conventional devices, it is necessary to time the opening/closing of the door and the tool exchange operation, so at the start of the tool exchange operation, the cylinder is actuated to open the door, and it is confirmed that the door is opened. Tools were exchanged from then on, and the door was closed only after confirming that the tool exchange was complete.

<Problems to be Solved by the Invention> Such conventional devices require a cylinder device for opening and closing the door and a control device for controlling this cylinder device, which not only complicates the configuration, but also prevents the door from being completely closed. Since the tool exchange operation cannot be started until after the door is opened, there is a problem in that the tool exchange time becomes longer depending on the opening and closing of the door.

<Means for Solving the Problems> The present invention provides a fixed cover having a window portion through which the rotating body and the tool changing arm can pass through when the rotating body rotates, and a fixed cover provided on the rotating body. On the other hand, it is disposed on the spindle head side, one end is pivoted coaxially with the rotation axis of the rotating body, and the other end extends along the side surface of the rotating body to a position where it does not interfere with the rotation of the tool changing arm. One end is pivoted near the side of the first door member and the window part on the far side from the revolving body, and the other end is in contact with the tip of the first door member in the closed state to open the window part. a second door member that closes the door member, and further includes a second door member disposed between the revolving body and the first door member and configured to open the second door member in response to the rotation of the revolving body between the first position and the second position. a first motion transmission mechanism that rotates a first door member in the same direction as the revolving body; and a second motion transmission mechanism that is disposed between the revolving body and the second door member and rotates the second door member in the opposite direction to the rotating direction of the revolving body. The present invention is characterized in that a second motion transmission mechanism for rotating the door member is provided.

Effect> When the rotating body rotates from the first position on the tool magazine side to the main shaft and the second position on the throat side for tool exchange, the first
Due to the action of the motion transmission mechanism, the first door member turns toward the spindle head side together with the rotating body, and at the same time, the second door member turns toward the spindle head side.
The door member also pivots in a direction opposite to the first door member due to the action of the second motion transmission mechanism, thereby allowing the rotating body and the tool changing arm to enter the cover. After the tool exchange is completed, when the rotating body turns from the second position to the first position, the first and second door members simultaneously turn in the opposite direction to the above case, and the rotating body turns. 1st
When the fixed cover is in the fixed position, the window of the fixed cover is closed by the first door member and the second door member, and it is possible to prevent cutting fluid and chips from scattering from the window of the cover.

<Example> Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, 1) is a spindle head that is guided so as to be movable in the vertical direction on a column 10, and a spindle 12 is supported on this spindle head 1) so as to be rotatable around a horizontal axis. A processing tool is detachably held at the tip of the main shaft 12 by a tool holding mechanism built inside the main shaft 12.

As shown in FIG. 2, a pair of chain-type one-item magazines 15 and 16 are arranged on the side of the column IO.
The tool changer 17 uses this pair of tool magazines 15 and 16.
Tools are exchanged between either one of the two and the main spindle 12. That is, an elevating member 21 that is moved vertically by a cylinder 20 is provided between the tool magazine 15, 16 and the column 10. As shown in Figure 3, the cylinder 22 is pivoted about a vertical pivot axis O as a pivot center.
A rotating body 23 is provided which is rotated between a first position P1 on the tool magazine 15, 16 side and a second position P2 on the spindle head 1) side. This revolving body 23 has an arm support portion 23a extending in a direction perpendicular to the spindle axis at the tip of a base extending in a direction parallel to the spindle axis while being located at a first position P1 on the tool magazine side. A tool changing arm 25 having a tool gripping mechanism at both ends is attached to the tip of the arm support 23a so as to be able to rotate around the axis of the arm support 23a. It is designed to be rotated.

Next, to explain the cover device, to the main shaft / throat 1)
A fixed cover 30 having a shape that surrounds the spindle head and the work table of the circuit is disposed on both sides, and the end of the fixed cover 30 on the side adjacent to the tool magazine is located at a first position P1. The fixing cover 30 is bent into a shape that does not interfere with the rotation of the tool changing arm 25 and when the rotating body 23 is located at the first position P1, the fixed cover 30 is located between the rotating body 23 and the spindle head 1). Along with this, the revolving body 23
A window 31 is formed that allows the passage of the tool exchange arm 25 and the rotating body 23 when the tool exchange arm 25 rotates from the first position P1 to the second position P2. It is closed by a door member 33 so that it can be opened and closed.

Of the first and second door members 32 and 33, the first door member 32 is disposed on the spindle head 1) side with respect to the rotating body 23, and one end thereof is aligned with the vertical axis on the fixed cover 10. It is connected via a rotation block 36 to the lower end of a pivot shaft 35 rotatably supported around the rotation block 36. As shown in FIG. 3, the pivot shaft 35 is disposed on the same axis as the rotation axis ○ of the revolving body 23, so that the first
The door member rotates about the same axis as the revolving body 23.

Further, the first door member 32 is installed in the rotating body so as not to interfere with the spindle head 1) and the column 10 when the rotating body 23 is located at the second position P2 on the spindle head side shown by the two-dot chain line in FIG. It is formed in a bent shape along the side surface of the arm 23, and its tip extends to the vicinity of the tip of the arm support portion 23a. At a position radially apart from the pivot shaft 35 of the rotation block 36, a rotation axis of the rotation body 23, which is fixed to the outer periphery of the base of the rotation body 23 and extends upward of the rotation body 23, is connected. There are 100 parallel operating shafts 37. The operating shaft 37 is set to such a length that the operating shaft 37 and the rotation block 36 do not come out of engagement even if the tool changing arm 25 moves to the lower end indicated by the two-dot chain line in FIG. There is.

Therefore, the rotating body 23 is in the first position P1 and the second position P2.
When the first door member 32 swings between the positions shown in FIG.

Further, even if the revolving body 23 moves downward for tool exchange, the first door member 32 is held in the closed position shown by the solid line in FIG. 1.

Next, to explain the support mechanism and opening/closing mechanism of the second door member 33, the window portion 31 formed in the fixed cover 30
A rotating shaft 40 rotatable around an axis parallel to the axis of the rotating body 23 is supported on the inner surface of the fixed cover 30 via a support block on the side far from the rotating body 23. One side of the second door member 33 is fixed to the moving shaft 40.

A portion of the second door member 33 that is close to the rotation shaft 40 extends toward the spindle head 1), and is bent toward the tool magazine 15, 16 from the approximately central portion, and the tip of the bent portion A rubber sealing member 34 is attached which slides into contact with the tip of the first door member 32.

A pulley 41 is fixed to an upper end of the rotation shaft 40 that protrudes from the upper surface of the fixed cover 30, and an upper end of the pivot shaft 35 that pivotally supports the first door member 32 protrudes from the fixed cover 30. A boo IJ42 is fixed to the idler pulley 43a, and wire rows 145 and 46 are connected between the boos 1J41 and 42 to transmit the rotation of the pivot shaft 35 to the rotation shaft 40.

43b. That is, Fig. 4 (a
), (As shown in bl, one end of the wire rope 45 is fixed to one location on the outer periphery of the pulley 41, and the pulley 4
After the outer circumference of 1 is wound clockwise, the idler pulley 43a
The other end is fixed to the outer periphery of the pulley 42 by rotating counterclockwise around the outer periphery of the pulley 42a via the . Also, one end of the wire rope 46 is fixed to the outer periphery of the pulley 41 and then rotated counterclockwise around the outer periphery of the pulley, and the other end is rotated clockwise around the outer periphery of the pulley 42 via the idler pulley 43b. is fixed to the outer periphery of the

Note that the radius of the boo 142 is 1.5 times that of the pulley 41.

Therefore, the revolving body 23 is at the first position P on the tool magazine side.
When the wire rope 45 is wound by the pulley 42, the pulley 41 is rotated clockwise by 135 degrees. The second door member 33 rotates, and the second door member 33 pivots from the closed position shown by the solid line in FIG. 4+a+ to the open position shown by the two-dot chain line. Conversely, when the rotating body 23 rotates from the second position P2 on the spindle head side to the first position P1 on the tool magazine side, the wire rope 46 is wound up by the pulley 42, causing the pulley 41 to move counterclockwise. Turn and open the second door member 33
2 from the opening position shown by the solid chain line in Fig. 4 (bl)
Rotate to the closed position shown by the dotted chain line.

Next, to explain the overall operation, after the tool exchange arm 25 takes out a tool to be exchanged from either of the tool magazines 15 or 16, the revolving body 23 moves from the first position P1 on the tool magazine side to the spindle head side. When the rotating body 23 rotates counterclockwise to the second position P2, the rotational force of the rotating body 23 is applied to the first door member 3 via the operating shaft 37 and the rotation block 36.
2, and the first door member 32 rotates counterclockwise together with the rotating body 23. Also, there is a rotating body 2 coaxially with this.
3 is also transmitted to the second door member 33 via the pulley 42, wire rope 45, pulley 41, and rotating shaft 40, and the second door member 33 also moves two points from the closed position shown by the solid line in FIG. The tool changing arm 25 is rotated clockwise to the open position shown by the chain line to allow the tool changing arm 25 to enter the fixed cover 30. Furthermore, after the tool exchange for the spindle 12 is completed,
When the rotating body 23 rotates clockwise from the second position P2 on the spindle head side to the first position P1 on the tool magazine side,
In the same manner as in the above case, the first door member 32 turns to the original position shown by the solid line, and at the same time, the clockwise turning movement of the rotating body 23 causes the pulley 42, the wire rope 46, and the pulley 41 to rotate.
, is transmitted to the second door member 33 via the rotation shaft 40, and the second
The door member 33 is rotated counterclockwise to the original position shown by the solid line.

As a result, the window portion 31 formed in the fixed cover 30 is completely closed by the pair of door members 32 and 33, and cutting fluid and chips can be prevented from scattering to the outside of the fixed cover 30.

Moreover, since the opening and closing of the first and second door members 32, 33 are performed in parallel with the rotating operation of the rotating body 23, the time required for tool exchange can be significantly reduced.

Furthermore, in this embodiment, the rotating body 23 is
An operating shaft 37 is provided that extends in a direction parallel to the rotation axis of the
This operating shaft 37 and the rotation block 36 fixed to the first door member 32 are configured to be engaged with each other while allowing movement in the axial direction, so that the rotating body 23 can be moved vertically for tool exchange. Even if it moves, this will cause the revolving body 23 and the first door member 3 to
There is an advantage that the first door member can be maintained in a closed state without being disengaged from the first door member.

<Effects of the Invention> As described above, in the present invention, the window formed in the fixed cover is opened and closed by a pair of door members, and the rotational force of the revolving body having the tool exchange arm is utilized. One door member pivots in the same direction as the revolving structure, and the other door member pivots in the opposite direction, so
The pair of door members can be opened and closed at the same time the revolving body starts rotating, which not only greatly reduces tool exchange time, but also eliminates the need for a cylinder device and a control device to control it in order to open and close the door members. Therefore, there is an advantage that the configuration can be greatly simplified.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view showing the main parts of the cover device, FIG. 2 is a view taken from the direction of the arrow in FIG. FIG. 4 (al, (bl) is a diagram showing the winding state of the wire ropes 45, 46 in FIGS. 1 and 2. 10... Column, 1 )...Spindle head, 15.16
...Tool magazine, 23...Swivel body, 25...Tool exchange arm, 30...Fixed cover, 32...First
Door member, 33... Second door member, 35... Pivot shaft, 3
6...Rotation block, 37...Operation axis, 40...
Rotating shaft, 41, 42. 43a, 43b...-Pulley,
45.46...Wire rope.

Claims (2)

[Claims] (1) A rotating body with a tool exchange arm attached to the tip thereof is supported so as to be pivotable between a first position on the tool magazine side and a second position on the spindle head side, and 2
A cover device for a machine tool in which a tool is exchanged by rotation between positions and rotation of the tool changing arm, the tool changing arm being able to pass through the rotating body when the rotating body rotates. A fixed cover having a window portion formed thereon is installed, and the cover is disposed on the spindle head side with respect to the rotating body, one end is pivoted coaxially with the rotation axis of the rotating body, and the other end is attached to a side surface of the rotating body. a first door member that extends along the axis to a position that does not interfere with the rotation of the tool change arm, and one end of which is pivoted near a side of the window portion that is far from the rotating body, and the other end of which is pivoted in the closed state. a second door member that faces the tip of the first door member and closes the window; and further provided between the revolving structure and the first door member, the first a first motion transmission mechanism that rotates the first door member in the same direction as the rotating body according to the rotation between the rotating body and the second position; and a first motion transmission mechanism provided between the rotating body and the second door member. A cover device for a machine tool, comprising: a second motion transmission mechanism that rotates the second door member in a direction opposite to the rotating direction of the rotating body. (2) the first motion transmission mechanism includes an operating shaft provided on the rotating body at a position radially spaced apart from the rotating axis of the rotating body and extending in a direction parallel to the axis of the rotating body;
Claims characterized in that the engaging member is fixed to the first door member and engages with the operating shaft while allowing movement in a direction parallel to the rotation axis of the rotating body. A cover device for a machine tool according to paragraph (1).