JPS5822300B2 - Holding device for tools etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a holding device for a tool such as a hob in a machine tool such as a hobbing machine, or a workpiece processed by a tool, which allows the tool to be easily and quickly replaced and the positioning after replacement. Provided is a holding device for tools, etc. that can perform this with high precision.

The present invention will be described below with reference to an example in which it is applied to a hob holding device of a hobbing machine.

However, the present invention is not limited to a hob holding device for a hobbing machine, but can be used for a tool holding device for other machine tools or a workpiece holding device.

In a conventional hobbing machine, the main shaft and the hob shaft are screwed together by bolts, and when replacing the hob, the hob can be removed from the hob shaft by holding down a removable bearing placed opposite the main shaft and loosening the bolt. Remove it, then install a new hob to complete the replacement.

As is clear from the above description, in this method, when replacing the hob, it is necessary to remove two types: the holding bolt of the bearing placed opposite to the main shaft and the nut for preventing the hob shaft from steadying.

Furthermore, when reassembling the hob after replacing it, the two types of bolts mentioned above are tightened in a specific order, which makes the work difficult.

With other conventional hobbing machines, it is necessary to twist a long bolt that passes through the hob arbor, pull it out, replace the hob, and fix the hob by penetrating the long bolt into the hob arbor and screwing it in, especially while holding the hob with one hand, which reduces work efficiency. Extremely bad.

In any of the above-mentioned methods, the diameter of the hob arbor cannot be made small because the bolt passes through the inside, and it is not possible to install a small-diameter hob.

As mentioned above, the hob holder of the conventional hobbing machine has low workability when replacing the hob, and it takes a lot of time to replace it.

Moreover, it requires a place to store the bolts and nuts that have been removed, making replacement work even more tedious.

Furthermore, if it takes a long time to replace the hob, the machine, ie, the hobbing machine, cannot be operated during this time, resulting in a decrease in its operating rate.

Since the hob support system is attached and detached when the hob is replaced, it is difficult to mount the tool (hob) with a predetermined accuracy after the tool is replaced, and it is difficult to maintain the machining accuracy within a predetermined range.

SUMMARY OF THE INVENTION An object of the present invention is to provide a holding device for a tool such as a hob or a workpiece that can be replaced in a very short time by an extremely simple operation.

That is, in the present invention, a sleeve is rotatably supported by a bearing by a housing, a slide center is slidably engaged in the axial direction within the sleeve, a holding part for a tool, etc. is formed at the tip, and a holding part for a tool or the like is formed at the rear end. This is a holding device for tools, etc., in which a tightening knob that moves the slide center in the axial direction by rotational movement is fitted, and the tightening knob is equipped with a clutch mechanism that enables the tightening knob to be engaged and disengaged from the sleeve. .

The tightening knob of the present invention is threaded or cam engaged with the rear end of the slide center, and by rotating the tightening knob, the slide center can be moved in the axial direction.

It is.

When holding a tool, etc., the tightening knob is rotated, the slide center moves in the direction of the tool, etc. and presses it, and the clutch mechanism between the tightening knob and the sleeve acts due to the reaction of the slide center, preventing it from falling off. By rotating the tightening knob in the opposite direction to loosen the pressure on the tool etc. on the slide center and release the clutch mechanism, the slide center can be moved back relative to the sleeve and the tool can be replaced.

The present invention will be described in detail below with reference to the drawings.

In FIG. 1, the hob support arbor 21 is on the left side of the figure.

It has a convex conical surface 21a on the right side, a flange portion 21b having a larger diameter than the main body portion on the right side, and a convex conical surface 2 on the tip thereof.
It has 1c.

Insert the hollow hob 23 into the hob support arbor 21 and press the key 22.
to prevent rotation and attach the tip to the flange part 21.
b, and fix the spacer 25 with a pinch nut 27.

Referring to FIGS. 2 and 3, the drive spindle 29 is formed with a concave conical surface 29a that corresponds to the conical inner conical surface and engages with the conical surface 21c, and is screwed onto the drive spindle 29. The driven key 31 is engaged with a key groove 21d formed in the hob support arbor 21, so that the drive spindle 290 rotation can be transmitted to the hob support arbor 21.

A guide pin 33 is screwed into a screw hole 29b formed in the drive spindle 29, and its tip is engaged with a notched groove 21e formed in a convex conical surface 21c of the hob support arbor 21.

The notch groove 21e has an L-shape consisting of an axial portion and a portion bent in the rotational direction of the hob support arbor from the tip of the axial portion, as shown by the chain line in FIG.
Push the hob support arbor 21 along the axial direction of e until the guide pin reaches the tip, then twist around the axis to position the guide pin in the bent part of the notched groove 21e, and the hob support arbor 21 is removed from the drive spindle 29. can be prevented.

Referring again to FIG. 1, a slide center 41 having a concave conical surface 41a at its tip that engages with the convex conical surface 21a of the hob support arbor 21 is supported so as to be slidable in the axial direction relative to the sleeve 43.

A sleeve 43 is supported by a housing 41 so as to be rotatable and immovable in the axial direction by a rolling bearing 45, and the housing 41 is fixed at a predetermined position on the machine base.

A male thread or a spiral cam 41b is carved at the rear end of the slide center 410, and a tightening knob 49 having a female thread or an engagement cam 49a that engages with the separation screw or spiral cam 41b is attached to the slide center 41.

The tightening knob 49 further engages the sleeve 43 via a clutch mechanism.

As shown in FIGS. 4 to 1, the clutch mechanism includes claws 55 protruding from the inner surface of the locking knob 49 at equal locations and guide grooves formed on the rear end circumferential surface of the sleeve 43 to engage with the claws 55. It consists of 43a.

The guide groove 43a includes a guide portion 43a' extending in the axial direction of the sleeve 43 and a locking portion 4 perpendicular to the guide portion 43a'.
3a".

The latch mechanism may include a groove formed on the inner surface of the tightening knob and a protrusion formed on the sleeve that engages with the short groove.

Furthermore, a nut 2 is screwed onto the convex conical surface of the hob support arbor 21.
A groove 27a is formed in 7, and a pin 42 protruding from the tip of the slide center 41 is engaged with the short groove 27a, so that the slide center 41 and the hob support arbor 21 are interlocked and tightened when the tightening knob is rotated as described later. The attached knob 49 is configured to rotate with respect to the slide center 41.

Additionally, a small diameter hole 49b in the radial direction is drilled in the tightening knob 49.
A plug 64 is screwed onto the engagement cam 49a, and a ratchet mechanism consisting of a pressing spring 63 and a ball 65 biases the engaging cam 49a.

Thus, when the rotational torque of the tightening knob 490 exceeds the transmission torque of the ratchet mechanism, the engagement cam 49a slides against the helical cam 41b.

In the device of the present invention having the above configuration, the hob support arbor 21 is located between the drive spindle 29 and the slide center 41, and the slide center 41 is connected to the sleeve 43.
advance along.

Next, as shown in FIGS. 4 and 5, the tightening knob 49 is fitted into the rear part of the sleeve 43 and rotated approximately 30 degrees to engage the pawl 55 with the guide groove 43a.

Next, by rotating the tightening knob 49 together with the sleeve 43 relative to the slide center 41, the engagement cam 49
a and the spiral cam 41b, the slide center 41 moves forward in the direction A in FIG.
is held between the drive spindle 29 and the drive spindle 29.

At the same time, the tightening knob is pressed in the direction B, and the side surface of the pawl 55 (Fig.
3a'', the tightening knob 49 is tightly connected to the sleeve 43, and the hob support arbor 21 is securely held.

When removing the hob support arbor 21, if the tightening knob 49 is rotated in the opposite direction together with the sleeve 43, the surface pressure of the pawl 55 and the engagement portion of the guide groove 43a of the sleeve 430 is reduced.

At this point, tighten the tightening knob 4 so that the pawl 55 is aligned with the guide groove 43a.
9 to move the slide center 41 together with the tightening knob 49 in the axial direction relative to the sleeve 43, thereby allowing the hob support arbor 21 to be replaced.

According to the present invention, when replacing tools, etc., it is only necessary to rotate the tightening knob with one suhana, and a large force is not required, and the work can be done easily and quickly because there is only one place to work. Tool replacement, which took 15 minutes with conventional equipment, can be done in an extremely short time of about 20 seconds.

In the present invention, the tool can be replaced without removing the bearing disposed opposite to the main shaft or disassembling the tool into each component, and the work environment does not become cluttered.

Also, since it is not disassembled into individual elements, it is easier to maintain accuracy after tool replacement.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. The diagram is IV-IV (VI-V
I) View from the arrow, FIGS. 5 and 7 are partial side views of FIGS. 4 and 6, respectively. 41... Slide center, 41b... Spiral cam, 43... Sleeve, 45... Rolling bearing, 47
...Housing, 49...Tightening knob, 49a...
Engagement cam 0

Claims (1)

[Scope of Claims] 1. A sleeve is rotatably supported on a bearing by a housing, a slide center is slidably engaged in the axial direction within the sleeve, a holding portion for tools, etc. is formed at the tip, and an axial support is formed at the rear end. A tightening knob that moves the slide center in the axial direction by rotational movement of the sleeve is fitted, and the tightening knob is equipped with a clutch mechanism that enables the tightening knob to be engaged with and disengaged from the sleeve. Holding device for tools, etc. 2. The tool holding device according to claim 1, wherein a ratchet J mechanism for regulating the amount of tightening of the tightening knob is provided between the tightening knob and the slide center. 3. A protrusion is formed at the tip of the slide center, and the protrusion is not able to fit into an end groove of a tool etc. fixed in the rotational direction, thereby facilitating relative rotation of the tightening knob with respect to the slide center. A holding device for tools, etc. according to item 1 or 2 of the scope.