JPS6221389Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing device having a tool attachment/detachment device for attaching and detaching a tool to one end of a spindle.

An object of the present invention is to allow the tool attachment/detachment device provided at the other end of the spindle to be moved away from the spindle axis to facilitate belt replacement.

Generally, processing equipment in which tools are replaced frequently is equipped with a tool attachment/detachment device.

However, since this tool attachment/detachment device is installed behind the pulley that drives the spindle, this tool attachment/detachment device poses an obstacle to the work of replacing the pulley.

This invention was devised to solve these conventional problems, and its characteristics are that the tool attachment/detachment device is moved far away from the spindle axis to create a space behind the pulley for the belt to pass through. This space allows for easy belt replacement.

An embodiment of the present invention will be described below with reference to the drawings. In the drawing, 1 is a spindle head fixed on a fixed part 2, and a spindle 4 is rotatably attached to this spindle head 1 via bearings 3, 3. It is supported on a shaft and is driven via a pulley 5 and a belt 6. A tapered hole 8 into which a tool 7 is fitted is formed at one end of the spindle 4, and an insertion hole 10 through which a drawbar 9 is inserted is formed at the other end.
Also, in the middle is a fitting hole 12 into which the sleeve 11 is fitted.
is formed. A holder 14 holding a plurality of steel balls 13 so as to freely move in the radial direction is integrally screwed onto one end of the drawbar 9, and a nut 15 is screwed onto the other end of the drawbar 9. The holder 14 is fitted into the sleeve 11 and the nut 15 is fitted into the insertion hole 10 of the spindle 4 so as to be movable in the axial direction, and between the end wall of the insertion hole 10 and the nut 15. A large number of disk springs 19 are stacked in multiple layers in a compressed state and are interposed to press the drawbar 9 toward the other end of the spindle 4. Thus, the steel ball 13 held in the holder 14 is moved toward the axis of the holder 14 by the conical cam surface 16 formed on the sleeve 11, and the bull stud 17 formed on the tool 7 is moved toward the axis of the holder 14.
The tool 7 is firmly fixed in the taper hole 8 of the spindle 4 by engaging with the large diameter portion 18 of the bull stud 17 and transmitting the repulsive force of the fixing spring 19 to the bull stud 17.

On the other hand, as shown in FIG. 2, a locking body 20 is screwed onto the other end of the spindle 4 at a constant distance from the pulley 5. A movable frame 21 is provided. The movable frame 21 has a support portion 22 extending parallel to the spindle axis on one side of the spindle 4, and a pivot shaft 23 passing through the support portion 22 allows the movable frame 21 to be attached to the support bracket 24 in a horizontal plane. Supported in a swingable manner. A bifurcated engagement protrusion 25 extending between the pulley 5 and the locking body 20 is formed on one side of the support portion 22, and a mounting portion 26 is formed on the other side. is integrally attached with the axis of the spindle 4 substantially aligned with the spindle 4. As is well known, the cylinder device 27 has a piston (not shown) and a piston rod 28 integral with the piston, and the piston rod 28 and the drawbar 9 are opposed to each other. Therefore, when the cylinder device 27 is actuated and the piston rod 28 comes into contact with the drawbar 9, the movable frame 21 swings about the pivot 23 due to the reaction force. As the movable frame 21 swings, the engaging protrusion 25 engages with the locking body 20, thereby canceling out the thrust load acting on the spindle 4.

The support bracket 24 usually has a fixing bolt 29
However, if this fixing bolt 29 is loosened if necessary, the support bracket 24 can swing on the fixed base 2 about the pivot bolt 30. Become.
This movement of the support bracket 24 is to move the support part 22 and the engagement protrusion 25 farther away from the other end of the spindle 4, and by this movement, the belt is moved between the other end of the spindle 4 and the movable frame 21. A space for exchanging 6 is now configured.

In addition, 31 is a spring for separating the engagement protrusion 25 from the locking body 20, 32 is a stopper bolt that restricts the swinging end of the movable frame 21, and 33 is a positioning pin of the support bracket 24, which is a reference on the fixed base 2. The hole 34 is made to correspond to either the through hole 35 or 36 on the support bracket 24, and the positioning pin 33 is inserted into this hole.
It is now possible to position the

In the above configuration, in order to release the tool 7 fixed to one end of the spindle 4, first, pressure oil is supplied to the cylinder device 27 to advance the piston rod 28 and bring it into contact with the draw bar 9. This contact stops the forward movement of the piston rod 28, and the reaction causes the cylinder device 27 and the movable frame 21 paired therewith to swing counterclockwise in a horizontal plane about the pivot 23 while compressing the spring 31. As a result, the engaging protrusion 25 engages with the locking body 20. This restricts further swinging of the movable frame 21, the piston rod 28 presses the drawbar 9 to the right against the repulsive force of the fixing spring 19, and the steel balls 13 move into the sleeve as the holder 14 moves. It faces the large diameter hole in 11. This releases the tool 7 from being restrained in the radial direction.
The tool 7 can be replaced.

At this time, as described above, the engaging protrusion 25 is engaged with the locking body 20 that is integrated with the spindle 4, and the pressing force of the piston rod 28 is as follows: drawbar 9→nut 15→fixing spring 19→spindle 4
→The locking body 20→The engaging protrusion 25 is transmitted to balance the cylinder reaction force acting on the cylinder device 27, and the thrust load does not act on the bearings 3, 3 that support the spindle 4, so the bearings 3, 3 The rotation accuracy of the spindle 4 can be maintained over a long period of time without being worn out.

When replacing the belt 6, first loosen the fixing bolt 29 and then remove the positioning pin 33. Then, attach the support bracket 24 to the pivot bolt 30.
, and position the support bracket 24 by inserting the positioning pin 30 at the position where the reference hole 34 and the through hole 36 correspond.

When swinging this support bracket 24, since the movable frame 26 is provided on one side of the spindle 4, the engagement protrusion 25 will move against the spindle 4.
The pulley 5 and the locking body 20 are separated from each other without interfering with each other, and a predetermined space is created between the pulley 5 and the locking body 20. Therefore, by passing the belt 6 to be replaced through this space, the belt 6 can be easily replaced.

After replacing the belt, pull out the positioning pin 33 again,
Swing the support bracket 24 forward and insert it into the reference hole 34.
With the through hole 35 aligned with the positioning pin 33
By inserting the belt and further tightening the fixing bolt 24, the support bracket 24 is accurately fixed in the position before belt replacement.

As mentioned above, the present invention has a structure in which the support bracket is pivotably supported on the fixed part about an axis perpendicular to the spindle axis, so there is no need to remove the tool attachment/detachment device including the cylinder and support bracket. Therefore, the operator can easily turn the support bracket with a small force, and when the support bracket is turned, the movable frame is retracted far from the rear end of the spindle, and a large space is secured between the two. This has the advantage that the belt can be replaced easily and quickly using this space.

Furthermore, since the present invention has a structure in which the movable frame is pivotably supported on the support bracket so as to be able to pivot about an axis that is perpendicular to the spindle axis, the movable frame has sliding resistance that impedes its swinging. has almost no effect, so when the piston rod of the cylinder device is brought into contact with the drawbar,
This movable frame can immediately swing around the pivot to bring the engaging protrusion into contact with the engaging element,
It has the advantage that no axial thrust can be applied to the spindle or even the bearings.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front sectional view of the device of the present invention, and FIG. 2 is a plan view seen from the direction of FIG. 1. 1...Spindle head, 4...Spindle,
5... Pulley, 9... Drawbar, 19... Fixing spring, 20... Engaging body, 21... Movable frame, 24... Support bracket, 27... Cylinder device, 29... Fixing bolt, 30... Pivot bolt.

Claims (1)

[Scope of utility model registration request] A cylindrical spindle is rotatably supported by a bearing on a spindle head placed on a fixed part, and a drawbar inserted into the inner hole of this spindle is pushed toward the rear end of the spindle by the repulsive force of a fixing spring. In this processing device, a tool is attached to the tip of a spindle, and the spindle is rotationally driven by a drive device via a belt and a pulley. Means is provided for positioning and fixing the support bracket on the fixed part, and a movable frame is mounted on the support bracket so as to be pivotable about an axis perpendicular to the spindle axis. This movable frame is formed with an engaging protrusion that engages and disengages with an engaging body screwed onto the rear end of the spindle, and also integrally fixes a cylinder device, and the piston rod of this cylinder device is attached to the rear of the drawbar. A processing device having a tool attachment/detachment device characterized in that its ends are opposed to each other.