JPH0121699Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a multi-spindle drilling machine in which a spindle head is provided with a large number of spindles and a drill is attached to the spindle.

<Prior art> In a multi-spindle drilling machine, a bushing plate that guides a drill attached to a spindle is movable relative to the spindle head by a guide shaft, and is always kept at the forward end by a spring. It is supported by pressure. This bushing plate is pressed to the forward end by a spring from the retreating end of the spindle head until the bushing plate contacts the workpiece, and the drill moves together with the spindle head while being detached from the bushing plate. When the bushing plate comes into contact with the workpiece, the bushing plate and the spindle head move relative to each other, and the drill is guided through the bushing plate to drill a hole in the workpiece.

<Problems to be solved by the invention> In this conventional multi-spindle drilling machine, the drill is guided through the bushing plate in each cycle.
Also, until it completely comes out of the bushing plate,
This requires a large stroke to move the spindle head and the bushing plate relative to each other, and it takes a long time for the drill to reach the workpiece, resulting in a long machining cycle time and limiting the ability to improve machining efficiency.

In order to shorten this cycle time, the stroke of the spindle head can be shortened, but if the stroke of the spindle head is shortened, there is a problem that the drill is always inserted through the bushing plate, making it impossible to replace the drill.

The purpose of this invention is to shorten the stroke of the spindle head when performing drilling work, shorten cycle time and improve work efficiency, and move with a large stroke only when changing the drill, making it easier to change the drill. This is what I did.

<Means for Solving the Problems> The present invention provides a multi-spindle drilling machine in which a bushing plate for guiding a drill is supported on a spindle head via a guide shaft so as to be movable relative to the spindle head. A stopper member is provided at the stopper member, and a semi-cylindrical cylinder is pivoted by a cylinder supported by a support member fixed to the stopper member, and is fitted into a guide shaft below the stopper member and engaged with the lower surface of the stopper member. A stroke adjusting member is pivotally attached to the stopper member, and is a collar having a length in the axial direction corresponding to the upward stroke of the bushing plate when the drill is inserted into the bushing plate.

<Examples> Examples of the present invention will be described below based on the drawings.
In FIG. 1, 1 is a bed, 2 is a column, and 3 is a spindle head that is guided by a vertical guide surface provided on the column 2 so as to be movable up and down.
A large number of spindles 4 are rotatably supported on the main shaft head 3, and the rotation of the drive motor is transmitted through a gear mechanism. 5 is a drill attached to the spindle 4. Further, a bushing plate 6 for guiding the drill 5 through the spindle head 3 is supported by a guide shaft 7 so as to be movable relative to the spindle head 3 and always pressed to the lower end by a spring 8. There is.

In the present invention, the bushing plate 6 is connected to the drill 5.
A stroke adjusting member 17 is provided which engages and disengages from the guide shaft 7 at the raised position of the bushing plate 6 that guides the guide shaft, allowing movement of the guide shaft in its upward axis and restraining movement in its downward axis.

A specific embodiment of the stroke adjusting member 17 and its engagement/disengagement mechanism will be described with reference to FIGS. 2 and 3.

The stroke adjustment member 17 is a semicircular collar that can be fitted onto the outer periphery of the guide shaft 7. This stroke adjustment member 17 is rotatably supported on a stopper member 9 fixed to the upper end of the guide shaft 7. The stroke adjustment member 17 has a length in the axial direction corresponding to the amount of relative movement of the guide shaft 7 with the main shaft head 3 at the retracted position of the bush plate 6 through which the drill 5 is inserted and guided.

Further, a cylinder 11 is supported by a support member 10 fixedly attached to the stopper member 9, and an actuating plate 13 fixed to the end of the piston rod 12 and the stroke adjusting member 17 are connected by a link 18. Reference numeral 16 indicates an operating lever for controlling the air valve of the cylinder 11. In the above embodiment, the actuator of the cylinder 11 is used to engage and disengage the stroke adjustment member 17, but it is also possible to manually operate the stroke adjustment member 17 using the operating handle. Further, although the illustrated example shows a rigid type in which the spindle head 3 moves up and down, the present invention can also be applied to a horizontal type in which the spindle head 3 moves forward and backward in the horizontal direction.

Since the present invention has the above-mentioned structure, during normal drilling, the bushing plate 6 is raised relative to the spindle head 3 to a position where the drill 5 is inserted and guided, and the stroke adjusting member 1
7 is fitted onto the upper end of the guide shaft 7 and is supported by the stopper member 9. As a result, the distance between the spindle head 3 and the bushing plate 6 approaches by the length of the stroke adjusting member 17, and the drill 5 is completely inserted into the guide bushing of the bushing plate 6. All that is required is to raise the spindle head 3 together with the bushing plate 6 to the extent that it does not get in the way of loading and unloading the workpiece on the table 1. Therefore, the upward stroke of the spindle head 3 is small, and the drill 5 immediately reaches the workpiece when machining is started, thereby eliminating wasteful downward movement time and shortening the cycle time accordingly.
Note that the downward movement of the spindle head 3 for feeding the drill 5 into the cut compresses the spring 8 and causes the guide shaft 7 and the spindle head 3 to move relative to each other.
The drill 5 can drill a hole to a required depth in a workpiece.

Next, when replacing the drill 5, the stroke adjustment member 17 is disengaged from the stopper member 9, and
By moving the spindle head 3 upward, the bushing plate 6 is moved relative to the spindle head 3 by the force of the spring 8, and the stopper member 9 is positioned at the forward end where it directly contacts the spindle head 3. By increasing the distance between the drill and the bush plate 6, the drill 5 can be completely removed from the guide bush of the bush plate 6, and the drill 5 can be replaced with respect to the spindle 4.

<Effects of the invention> As described above, according to the invention, the distance between the bushing plate, which guides the drill through the hole, and the spindle head is brought closer by the stroke adjustment member, and the drill is completely aligned with the guide bush of the bushing plate. Since the drill is inserted into the workpiece, the amount of upward movement of the spindle head is small, and the time it takes for the drill to reach the workpiece can be significantly shortened, improving machining efficiency. Since it has a semi-cylindrical shape that fits into the guide shaft, the stroke adjustment member is deformed and damaged when the bushing plate is suspended in the raised position where gravity is applied in the downward direction due to large weight and spring force. It has the effect of being rigidly supported without any friction and ensuring durability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the present invention, showing the drilling operation state. FIG. 2 is a perspective view of the main components of the present invention, showing the state during drilling work.
FIG. 3 is a perspective view of the main components of the present invention showing the state when the drill is replaced, and FIG. 4 is a perspective view showing the position of the bush plate and the main shaft head when the drill is replaced. 1... Base, 3... Spindle head, 4... Spindle, 5... Drill, 6... Bush plate,
7...Guide shaft, 8...Spring, 9...
...stopper member, 17...stroke adjustment member.

Claims (1)

[Scope of utility model registration request] It is equipped with a multi-axis spindle, and a bushing plate that guides a drill attached to the spindle is movable relative to the spindle head by a guide shaft, and is always kept at the lowering end by a spring. In a multi-spindle drilling machine supported by pressing, a stopper member is provided at the upper end of the guide shaft, and the guide shaft below the stopper member is rotated by a cylinder supported by a support member fixed to the stopper member. a stroke adjusting member, which is a semi-cylindrical collar that fits into the bottom surface of the stopper member and has a length in the axial direction corresponding to the upward stroke of the bushing plate through which the drill passes through the bushing plate; is pivotally connected to the stopper member.