JPS601952Y2 - Fixed position holding device for attachment - Google Patents

Description

[Detailed Description of the Invention] The present invention is a fixed position holding device for an attachment in a machine tool.

When driving the main shaft of an attachment, the first main shaft on the main shaft head side and the second main shaft on the attachment side are connected, but at this time, the connection key provided on one side of both main shafts and the connection key provided on the other side The connecting keyway must face each other in a fitable state.

When connecting manually, the key or keyway can be manually rotated so that they face each other in a mating state, but when connecting automatically, the key and keyway can be automatically aligned in advance. must be faced.

In view of the above points, the present invention aims to provide a fixed position holding device that can automatically align a key and a keyway when attaching an attachment.

Hereinafter, an embodiment of the present invention will be described based on the drawings.
In the fixed position holding device for an attachment that automatically maintains the relative position of the connecting key 3 and the keyway 4 in a fixed state when connecting, a clamping device 15 that clamps the upper part of the attachment case 2a by a vertically movable member 17 is provided. A key 3 and a key groove 4 are provided on the lower end surface of the first main shaft A1.
A transmission disk 5 is provided above the second main shaft A2 and is connected to the inner peripheral surface of the transmission ring 6 fixed to the lower outer circumference of the transmission disk 5 and the upper end of the second main shaft A2. It is fitted to the outer peripheral surface of the fixed upper part 7 so as to be vertically movable and integrally rotatable, and between the upper end surface of the second main shaft A2 and the lower end surface of the transmission disc 5, the transmission disc 5 is urged upward. A spring 8 is interposed, and a third positioning tooth 9 is formed on the upper end surface of the transmission ring 6.
A second positioning tooth 9b that is removably fitted to the attachment case 2a is fixed to the attachment case 2a.

Further, in this embodiment, the second positioning tooth 9b is formed on a second indexing plate a fixed to the attachment case 2a, and the second positioning tooth 9b is formed with an indexing tooth 11a formed on the upper end surface of this indexing plate B2. An indexing tooth 11b that is removably fitted is formed on the second indexing plate a fixed to the lower end surface of the quill 12 of the spindle head 1.

The upper part 5a of the transmission plate 5 has the same conical shape as a normal tool adapter, and the upper protrusion 5b is connected to the first main shaft A1.
It is gripped by a collet 13 inside and is forcibly pushed out downward by the extrusion of a draw bar 14.

Further, the key 3 has a rectangular cross section and is 180° to the first principal axis A1.
Two key grooves 4 are formed in the transmission plate 5, and two key grooves 4 are fixed with pitches.

Also, the tooth 9a. 9b is formed so that when fitted together, the key and the keyway are in a fixed state facing each other.

Further, the clamping device 15 for clamping the upper end protrusion 2b of the attachment case 2a is attached to the lower part of the quill 12, and this includes a fixed ring 16 fixed to the quill 12,
A well-known structure consisting of a cylindrical movable member 17 that is arranged to have an oil chamber between it and the fixed ring and is movable up and down, and a protrusion 17a fixed to the movable member 17 is adopted.

Further, the transmission ring 6 and the upper part 7 are connected by a spline fitting 18 so as to be vertically movable and integrally rotatable.

Next, the operation of attaching and detaching the attachment will be explained.

Since the first spindle A□ is automatically controlled to be in a fixed position in the rotational direction by the attachment exchange command, it always stops at the fixed position.

In this state, first, the movable member 17 of the clamp device 15 is moved down to move the entire attachment down, the positioning teeth 9b are moved down, and the indexing teeth 11a and llb are disengaged from each other.

At this time, since the transmission disk 5 and the transmission ring 6 are fixed to the first main shaft A1, the positioning teeth 9a and 9b fit together, and the teeth 9a,
The fixed positions of the key 9b, the key 3, and the keyway 4 are maintained.

Next, rotate the first main shaft A□ by 45 degrees and connect it to the transmission plate 5,
Transmission is transmitted to the transmission ring 6, the teeth 9a, 9b, and the case 2a to rotate the protruding piece 2b of the case 2a by 45 degrees to release the engagement with the protruding piece 17a in a plan view.

At this time, the attachment 2 is received by a carrier (not shown) so that its fixed position is maintained using a pin (not shown) or the like.

Next, the draw bar 14 is moved downward to push down the protrusion 5b of the transmission disk 5, and the collet 13 is opened.

As a result, the spring 8 is compressed, and the lower surface of the transmission plate 5 and the upper surface of the second main shaft A2 are in contact with each other, and once the teeth 9
A and 9b also come off, the key groove 4 comes off from the key 3, the attachment 2 leaves the spindle head 1, and gets on the conveyor table.

At this time, as shown in FIG. 2, the transmission disk 5 slides upward at the spline fitting 18 due to the action of the spring 8, and the teeth 9a, 9
b are fitted together again, the transmission disk 5, the second main shaft A2, etc. cannot rotate, and the keyway 4 is held in a fixed position.

Next, to attach the attachment to the spindle head from the state shown in FIG. 3 and the key groove 4, the case 2a is rotated 45 degrees in the opposite direction to the above using the drive device on the conveyor side, the protrusions 2b and 17a are engaged, and the collet 13 is pulled up and closed. , pull up the movable member 17 of the clamping device 15 and remove the teeth 9.
Complete the mounting with a and 9b uncoupled.

In this state, the rotation of the first main shaft A1 is not transmitted from the positioning tooth 9a to the case 2a, but only to the second main shaft A2.

As is clear from the above explanation, in the present invention, by moving the movable member of the clamp device downward, the positioning tooth of the second main shaft of the attachment and the positioning tooth on the attachment case side are engaged, and the spring is used to engage the positioning tooth of the attachment case. Since the fitting is maintained, there is an excellent effect that the key connecting the first main shaft and the second main shaft and the key groove can always be opposed to each other when attaching the attachment.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an attachment according to an embodiment of the present invention in a state in which the attachment is attached, and FIG. 2 is a longitudinal cross-sectional view in a state in which the attachment is removed. A□: First spindle, A2: Second spindle, 1: Spindle head, 2: Attachment, 2a: Its case, 2b: Projection piece, 3: Key, 4: Keyway, 5: Transmission plate, 6: Transmission ring , 7: Upper part,
8 second spring, 9a: first positioning tooth, 9b: second positioning tooth, lla, 11b: indexing tooth, 15: clamp device,
17: Vertically movable member, 17a: Projection piece, 18 Nispline fitting.

Claims (1)

[Scope of utility model registration request] A fixed position holding device for an attachment that automatically maintains the relative position of a connecting key 3 and a keyway 4 in a fixed state when connecting a second main shaft A2 of an attachment 2 to a first main shaft A1 of a main spindle head 1, A clamping device 15 that clamps the upper part of the attachment case 2a by a vertically movable member 17
A transmission plate 5, which is connected to the lower end surface of the first main shaft A□ by the fitting of the key 3 and the key groove 4, is connected to the second main shaft A.
The inner peripheral surface of the transmission ring 6 provided on the upper side of the transmission ring 6 and fixed to the outer peripheral part of the transmission plate 5 and the outer peripheral surface of the upper part 7 fixed to the upper end of the second main shaft are vertically movable and integrally rotate. A spring 8 is interposed between the upper end surface of the second main shaft A2 and the lower end surface of the transmission disk 5 to bias the transmission disk 5 upward, and is formed on the upper end surface of the transmission ring 6. -th positioning tooth 9a
A fixed position holding device for an attachment, characterized in that a second positioning tooth 9b, which is removably fitted with the second positioning tooth 9b, is fixed to the attachment case 2a.