JPS6140484B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-shaft attachment used in drilling machines, tapping machines, etc., and its purpose is to engage a main shaft gear with a plurality of intermediate gears, and engage each intermediate gear with a spindle gear. In a multi-axis attachment in which drills, taps, etc. attached to a plurality of spindles can be rotated at the same time, interference between the intermediate gears and spindle gears can be prevented, and damage to the tooth tips of the gears can be prevented. An object of the present invention is to provide a mechanism for preventing gear interference.

Hereinafter, a first embodiment in which the present invention is embodied in a drilling machine will be described with reference to FIGS. Attachment member 4 to
Multi-axis head 5 removably mounted via
It is designed to be inserted into the center from above. A spindle 6 is attached to the disk portion 5a at the upper end of the multi-axis head 5.
A plurality of gears are fixed in the circumferential direction, and an intermediate gear 7 is rotatably attached to the lower part of each gear. This intermediate gear 7 consists of an upper intermediate gear 7A that meshes with the main shaft gear 1 and a lower intermediate gear 7B below it.The upper intermediate gear 7A has the same diameter and approximately the same tooth width as the main shaft gear 1, and the lower intermediate gear 7B has a smaller diameter and a larger tooth width than the upper intermediate gear 7A.

The annular mounting portion 5b at the lower end of the multi-axis head 5 has a second
As shown in the figure, a plurality of mounting holes 8 are formed in the circumferential direction, and a plurality of mounting holes 8 (the intermediate gear 7
The same number of spindle holders 9 are fixed by mounting bolts 10 inserted into their long grooves 9a. This spindle holder 9 can be adjusted to move within the length of its long groove 9a, and can also be adjusted to rotate around a mounting bolt 10. The inner end of this spindle holder 9 is located inward than the mounting part 5b, and a spindle 11 is rotatably attached to this inner end, and the shaft part 11a passes through the spindle holder 9 and connects the multi-axis head. It is projected into 5.

The shaft portion 11a of the spindle 11 passes through the base end portion of the holder arm 12 disposed in contact with the upper surface of the inner end portion of the spindle holder 9, and the lower end portion of the support shaft 6 of the intermediate gear 7. is rotatably inserted into the tip of the holder arm 12, and the distance between the support shaft 6 and the shaft portion 11a of the spindle 11 is always kept constant. Each shaft portion 11a
A spindle gear 13 that meshes with the lower intermediate gear 7B is fixed to the upper end, and the spindle gear 13 has the same diameter as the lower intermediate gear 7B and a smaller tooth width. Note that this spindle gear 13 is provided in a step-like manner to prevent mutual interference. Further, a drill 14 is attached to the lower end of the spindle 11.

In the multi-shaft attachment configured as described above, the rotation of the main shaft gear 1 is transmitted to the spindle gear 13 via the upper and lower intermediate gears 7A, 7B, and the spindle 11 and the drill 14 are rotated. .

Now, in this first embodiment, a disk-shaped prevention plate 15 is provided opposite to the lower end surface of each of the upper intermediate gears 7A.
is attached, and the diameter of this prevention plate 15 is slightly larger than the tip circle diameter of the upper intermediate gear 7A, and the outer circumferential surface 15a of the prevention plate 15 is further outward than the tooth tip surface of the upper intermediate gear 7A. It stands out.
This prevention plate 15 is located below the lower end surface of the main shaft gear 1. Further, a slight gap G is formed between this prevention plate 15 and the lower end surface of the upper intermediate gear 7A.

Conventionally, such a prevention plate 15 was not provided, so when the upper intermediate gears 7A were brought close to each other in order to change the position of the drill 14, as shown by the imaginary line in FIG. There were cases where it was damaged.

However, in the first embodiment, even in such a case, the outer peripheral surfaces 15a of the prevention plates 15 contact each other as shown in FIG. 4 before the two intermediate gears 7A contact each other, so that the teeth of the upper intermediate gear 7A The tips will no longer come into contact with each other and be damaged. In addition, in actual use, the prevention plates 15 are separated from each other a little. Further, in the embodiment described above, since the gap G is provided, fine dust adhering to the tooth root surface of each upper intermediate gear 7A gradually moves into the gap G without accumulating on the tooth root. Therefore, the meshing between both gears 7A does not deteriorate.

Next, a second embodiment shown in FIGS. 5 to 7 will be described. In this embodiment, in one of the plurality of intermediate gears 7 in the first embodiment,
While eliminating the lower intermediate gear 7B, the tooth width of the upper intermediate gear 7A is increased to form an intermediate gear 7C,
A spindle gear 13A is directly meshed with this intermediate gear 7C. This spindle gear 13A has a larger diameter than the other spindle gears 13, and has the same diameter as the main shaft gear 1 like the intermediate gear 7C.

By providing the large-diameter spindle gear 13A in this manner, the spindle 11 having this gear 13A can be positioned at the center of the main shaft gear 1;
If the large-diameter spindle gear 13A and the lower intermediate gear 7B come close to each other as shown by the imaginary lines in FIG. 6, their tooth tips will come into contact with each other and be damaged. However, as in the case of the first embodiment,
Since the prevention plate 15 is provided opposite the lower end surface of the large diameter spindle gear 13A, the prevention plate 15 comes into contact with the lower intermediate gear 7B as shown in FIG. 7, and the tips of the teeth do not contact each other. Note that during actual use, the prevention plate 15 is slightly separated from the lower intermediate gear 7B. Further, the gap G in this embodiment also performs the same function as in the first embodiment.

Note that this interference prevention mechanism can also be used with the multi-axis attachment placed sideways.

In the present invention described in detail above, a plurality of intermediate gears 7 are meshed with the main shaft gear 1, and each intermediate gear 7
In a multi-axis attachment in which a spindle gear 13 is meshed with a plurality of spindles 11 to rotate drills, taps, etc. attached to a plurality of spindles 11 at the same time, mutual interference between the intermediate gears 7 and the spindle gears 13 is prevented. Since the prevention member 15 is provided on the intermediate gear 7 and/or the spindle gear 13, interference between adjacent tooth tips can be prevented and damage to the tooth tips can be prevented.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, FIG. 1 is a partially cutaway front view of the multi-axis attachment, FIG. 2 is a bottom view showing the spindle holder installed, and FIG. FIG. 4 is a partial bottom view showing the action of the prevention plate; FIGS. 5 to 7 show the second embodiment of the present invention; FIG. FIG. 6 is a partially cutaway front view of the multi-axis attachment, FIG. 6 is a partial bottom view showing the gear arrangement and the state of interference between the tooth tips, and FIG. 7 is a partial bottom view showing the action of the prevention plate. Main shaft gear 1, multi-shaft head 5, intermediate gears 7, 7
C, upper intermediate gear 7A, lower intermediate gear 7B, spindle holder 9, spindle 11, spindle gears 13, 13A, prevention plate (prevention member) 15, gap G.

Claims (1)

[Claims] 1 A plurality of intermediate gears 7 are meshed with the main shaft gear 1, and a spindle gear 13 is connected to each intermediate gear 7.
In a multi-axis attachment which is capable of simultaneously rotating drills, taps, etc. attached to a plurality of spindles 11 by meshing them, a prevention member for preventing mutual interference between the intermediate gears 7 and the spindle gears 13. 15 is provided on the intermediate gear 7 and/or the spindle gear 13. A mechanism for preventing gear interference in a multi-shaft attachment. 2. The prevention member is a disk-shaped prevention plate 15 whose diameter is slightly larger than the tip circle diameter of each gear 7A, 13A, and the outer peripheral surface 15a of the prevention plate 15 is connected to each gear 7.
A gear interference prevention mechanism in a multi-axis attachment according to claim 1, which protrudes outward beyond the tooth tip surfaces of the gears A and 13A. 3. In the multi-axis attachment according to claim 2, the prevention plate 15 is provided facing one end surface of each gear 7A, 13A, and forms a slight gap G between the prevention plate 15 and the one end surface. Gear interference prevention mechanism. 4. The prevention plate 15 is provided on a plurality of intermediate gears 7A that mesh with the main shaft gear 1.
A mechanism for preventing gear interference in the multi-axis attachment described in . 5. A gear interference prevention mechanism in a multi-axis attachment according to claim 3, wherein the prevention plate 15 is provided on the spindle gear 13A having a larger diameter than the other spindle gears 13.