JP2538352B2 - Offset mechanism for rotary tool attachment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset mechanism for a rotary tool attachment, which is attached to a turret tool rest of a lathe and can be offset in the Y-axis direction.

2. Description of the Related Art Conventionally, when, for example, drilling is performed at a right angle at a position away from the Y-axis axis of the outer periphery of a workpiece gripped by a spindle chuck of a lathe, as shown in FIGS. 3 and 4. A drive shaft 101 is added to the mechanism of a normal rotary tool attachment, and the rotary tool shaft turns around this drive shaft and the offset amount a,
A manual offset rotary tool attachment designed to obtain a'is used.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the manual offset type rotary tool attachment described in the prior art, the amount of protrusion from the turret mounting surface increases as the drive shaft 101 is added, and the interference with the chuck or other tools is increased. However, there was a problem that it was inconvenient.

The present invention has been made in view of the above problems of the prior art, and its main object is an offset mechanism for a rotary tool attachment, which has a small amount of protrusion and is easy to perform offset adjustment. Is to provide.

Means for Solving the Problems In order to achieve the above object, the offset mechanism of the rotary tool attachment according to the present invention is a drive shaft parallel to a main shaft that is detachably attached to a turret and is rotated by a drive device with a built-in tool post. A rotary tool attachment having an intermediate shaft parallel to the drive shaft rotated by the gear of the drive shaft and a rotary tool shaft perpendicular to the main shaft rotated by a bevel gear of the intermediate shaft, the base of the attachment body A first positioning gear fixed concentrically to the drive shaft, a second positioning gear fixed to an offset portion of the attachment body concentric with the intermediate shaft and having the same number of teeth as the first positioning gear, the drive A guide plate rotatable about an axis and rotatably fitted in a cylindrical portion concentric with the second positioning gear; The guide plate is rotatably provided and includes an intermediate gear that meshes with the first positioning gear and the second positioning gear.

Action When the clamp bolt is loosened and the offset portion is manually moved, the guide plate connecting the base portion of the attachment body and the offset portion pivots about the drive shaft. With this turning, the second positioning gear fixed to the offset portion, which meshes with the first positioning gear and the intermediate gear, rotates, and the offset portion moves in an arc so that the rotary tool shaft moves in parallel.

EXAMPLE An example will be described with reference to FIGS. 1 and 2.

In a known lathe, a spindle 2 is rotatably supported by a spindle headstock 1, a chuck 3 is fitted to the tip of the spindle, and a workpiece W is attached to a chuck gripping claw 3a. On the other hand, a tool post (not shown) that can move and position in the Z-axis and X-axis
Turret 4 that enables swivel indexing around the swivel center axis in the axial direction
Is provided, and the rotary tool attachment 5 is detachably attached to the rotary tool attachment station on the left side surface of the turret 4. The main body of the rotary tool attachment 5 is composed of a base portion 6A attached to the turret 4 and an offset portion 6B fixed to the left end surface of the rotary tool attachment 5 so as to be movable in position. A drive shaft 7 is rotatably supported in parallel with. The bearing 8 also serves as a turning bearing for the guide plate 10 which is provided in the base portion 6A and can turn about the drive shaft 7. A rotation transmission clutch 11 that engages with a clutch at the tip of a drive shaft provided in a tool rest (not shown) is fitted to the right end of the drive shaft 7, and a drive gear 12 is fitted to the left end. Further, a positioning gear 13 is fixed to the inner end surface of the base portion 6A concentrically with the drive shaft 7, and arcuate elongated holes 16 through which bolts 15 for fastening the offset portions 6B are loosely formed are provided at positions near the four corners of the base portion 6A. Has been done.

Rotating tool shaft 18 on the offset part 6B of the attachment body
Is rotatably supported by bearings 19 and 20 at right angles to the main shaft 2, a bevel gear 21 is fitted to the rotary tool shaft 18, and a collet bush 22 for holding the rotary tool T is attached to the tapered hole at the tip. . Further, a bevel gear 23, which meshes with the bevel gear 21 at right angles to the rotary tool shaft 18 and parallel to the drive shaft 9, is integrally provided in the offset portion 6B, and a gear 29 meshing with the drive gear 12 is fitted in the central portion. The intermediate shaft 24 is rotatably supported by bearings 25 and 26, and the bearing 26 is inserted into a center hole of a positioning gear 27 that is fitted into a hole concentric with the intermediate shaft 24 of the offset portion 6B. The positioning gear 27 has the same number of teeth as the positioning gear 13 described above, and its outer circumference 27a
Are rotatably fitted in the holes of the guide plate 10. Both positioning gears 13 and 27 are meshed with each other via an intermediate gear 28 rotatably supported by a pivot shaft (not shown) embedded in the guide plate 10, and the offset portion 6B is centered on the drive shaft 7. The turning of the guide plate 10 causes the positioning gear 27 to rotate via the intermediate gear 28 and move in an arc shape to rotate the rotary tool shaft 18
Can be moved in parallel in the Y-axis direction while always maintaining a right angle with respect to the main shaft 2, and can be moved within a predetermined amount B, B'with respect to the center of the main shaft.

 Next, the operation of this embodiment will be described.

When a workpiece W having a drilling point at a position distant from the axis on the circumference in the Y-axis direction is designated as the next workpiece,
When the rotary tool attachment 5 is taken out from the storage location and the bolts 15 at the four corners are loosened to move the offset portion 6B of the main body, the positioning gear rotates via the intermediate gear,
The rotary tool shaft 18 moves in parallel, and the offset portion 6B moves in an arc shape at a designated offset position. Next, the bolt 15 is tightened to fix the offset portion 6B to the base portion 6A, and the offset adjustment of the rotary tool attachment is completed.

Rotary tool attachment 5 after offset adjustment
Is attached to the rotary tool mounting position of the turret 4, the clutch 11 engages with the clutch at the tip of the drive shaft in the tool rest (not shown) to enable rotation transmission.

When the workpiece W is gripped by the spindle chuck, the tip is supported by the tailstock center 30, and the spindle is rotated to complete the turning process by the turning tool, the rotation of the spindle is stopped and clamped, and the turret 4 turns. The rotary tool attachment 5 is indexed to the cutting position. Then, the tip of the rotary tool (drill) T mounted on the rotary tool shaft 18 is positioned in front of the drilling position of the workpiece W by the movement of the tool rest (not shown) in the Z-axis direction and the X-axis direction, and is not shown. The rotary tool motor rotates, the drive shaft 7 rotates via the clutch 11,
Further, the rotary tool shaft 18 on which the drill T is mounted is rotated via the drive gear 12 and the gear 29. Then, the workpiece W is drilled at an offset position in the Y-axis direction by cutting feed in the X-axis direction of the tool rest. As shown in FIG. 2, when the offset portion 6B of the main body is offset to the right by the offset amount B, the X-axis position of the drill tip is displaced by C to the work side.

This displacement amount C is Here, A can be calculated by A = center distance between the drive shaft 7 and the intermediate shaft 24 (a constant determined by the machine) and B = offset amount, and correction is performed by a program or a tool offset.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it has the following effects.

A first positioning gear is fixed to the base of the attachment body concentrically with the drive shaft, a second positioning gear with the same number of teeth is fixed concentrically to the intermediate shaft on the offset part, and an intermediate gear that meshes with both positioning gears is provided. 2 A guide plate having a hole that is rotatably fitted in the cylindrical portion of the positioning gear is provided so as to be rotatable around the drive shaft, and the rotary tool is moved in parallel by the arcuate movement of the offset portion of the main body. As a result, quick and easy setup change can be performed for different offset amounts, and a large Y-axis function is available for drilling or tapping the offset position on the work circumference. It can be done with a compact and inexpensive rotary tool attachment without using a machine, increasing the number of simultaneous one-chucking machining points, and increasing the utility value of the machine. To large.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary tool attachment having a main part of a lathe and an offset machine of this embodiment, FIG. 2 is a sectional view taken along the line EE of FIG. 1, and FIG. 3 is a conventional rotary tool attachment. Schematic mechanical view, FIG. 4 is a schematic mechanical view of FIG. 3 seen from the lower side. 4 …… Turret, 7 …… Drive shaft 6A …… Base part of attachment body 6B …… Offset part of attachment body 10 …… Guide plate 13 …… First positioning gear 24 …… Intermediate shaft 27 …… Second positioning gear 28 ...... Intermediate gear

Claims (1)

(57) [Claims] 1. A drive shaft (7) which is removably mounted on a turret (4) and is rotated by a drive unit having a built-in tool post, the drive shaft being parallel to a main shaft, and the drive being rotated by a gear (12) of the drive shaft. The intermediate shaft (24) parallel to the shaft and the bevel gear (2
Rotating tool axis (1
In a rotary tool attachment (5) having 8) and a first positioning gear (13) fixed to the base (6A) of the attachment body concentrically with the drive shaft, and an offset portion (6B) of the attachment body, A second positioning gear (27) having the same number of teeth as the first positioning gear fixedly attached concentrically to the intermediate shaft, and a cylindrical portion (27a) rotatable about the drive shaft and concentric with the second positioning gear. Guide plate (1
0) and an intermediate gear (28) that is rotatably provided on the guide plate and meshes with the first positioning gear and the second positioning gear, and the offset portion is moved by rotating in an arc when adjusting the offset. Offset mechanism for rotary tool attachments characterized by parallel movement of the tool axis.