JPH0340492Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The present invention is a tool post for selectively driving a plurality of rotary tools mounted on the tool post by providing a drive spindle at the center of the tool post. This invention relates to a rotation transmission mechanism.

"Prior Art" A turret-type machine tool in which a plurality of processing tools are arranged on a rotatable tool post, in which a part or all of the processing tools are rotatable units,
Regarding the rotation transmission mechanism of the tool post that selectively transmits rotational power from the drive shaft provided at the center of the rotating tool post to the rotary tool unit by turning the tool post, various structures are used. There is.

In general, the clutch shifts the rotation of the rotary tool drive motor installed on the base side and transmits the rotation to the rotary tool unit on the tool post, and when the tool post rotates and indexes, the tool post engages with the toothed coupling. The positioning operation of the tool rest by moving it in the direction of the spindle axis and the fixing operation of the tool rest of the base are performed sequentially, whereby the workpiece is sequentially machined by a plurality of rotary tool units.

Conventionally, the above-mentioned clutch utilizes the shifting operation of the tool rest when engaging and disengaging the clutch between the rotary tool and the transmission element.

``Problems that the invention aims to solve'' However, in the conventional rotation transmission mechanism of the tool post, the shift operation of the tool post was used to index the selected position, so it took too much time to switch the clutch, which increased the machining time. There was a problem in that it did not meet the request for cuts.

The present invention was developed by focusing on these conventional problems, and by using an indexing cam in the indexing mechanism of the tool post, the shift operation of the tool post is no longer required, and instead, the clutch switching operation is eliminated. The purpose of the present invention is to provide a rotation transmission mechanism in a tool post in which clutch switching is completed at the same time as indexing is completed, and rotational power is transmitted by using a cam to perform the shift operation. .

"Means for Solving the Problems" The gist of the present invention to achieve such an objective is to provide a drive main shaft that is supported within a hollow shaft and transmits rotational driving force, and a drive main shaft that is provided at the end of the drive main shaft. a rotary tool unit equipped with a main drive gear mounted on a tool rest, an output gear that rotates a tool by receiving rotational power, and a rotary tool unit that is constantly meshed with the output gear and that is moved in an axial direction to engage the drive gear. In a rotation transmission mechanism for a tool post consisting of an intermediate gear that can be engaged and detached, a cam that moves the intermediate gear in the axial direction is disposed on the back side of the tool post, and comes into contact with the cam to move the intermediate gear. a shifter rod that performs this is slidably fitted onto the center shaft of the intermediate gear shaft, a first shifter spring is disposed inside the intermediate gear shaft to always press the shifter rod toward the cam, and the intermediate gear is slidably fitted onto the intermediate gear shaft, and a spring receiving pin is passed through the shaft in a direction perpendicular to the axis, and an elongated hole is provided in the shifter rod to allow the spring receiving pin of the intermediate gear to pass through, and the shifter rod is inserted into the intermediate gear shaft. A shifter second spring is inserted between the spring receiving pin and a flange provided on the shifter rod such that the spring receiving pin comes into contact with the rear end of the elongated hole of the shifter rod when the shifter is away from the cam. The present invention relates to a rotation transmission mechanism in a tool rest, which is characterized in that it is interposed.

"Operation" When the tool post rotates and a certain rotary tool is indexed, the shifter rod of the intermediate gear simultaneously contacts the cam on the back of the tool post, pushing the intermediate gear in the direction of meshing with the main drive gear. However, when both gears are not in the meshing position, the second shifter spring is momentarily pressed. However, since the main drive gear is constantly rotating, the two gears immediately enter the meshing position, and the intermediate gear, pushed by the pressing force of the second shifter spring, immediately enters the meshing state with the main drive gear.

Since the intermediate gear and the output gear of the rotary tool unit are always in mesh with each other, when the main drive gear and the intermediate gear are meshed with each other, the rotational power of the main drive shaft is transmitted to the rotary tool unit.

When another rotary tool is selected and the turret rotates, the shifter rod of the intermediate gear, which had been pressed by the cam, is released from the cam and the shifter rod of the first
The spring disengages the intermediate gear from the main drive gear, and the transmission of rotational power to the rotary tool unit meshed with the intermediate gear is cut off.

“Embodiment” An embodiment of the present invention will be described below based on the drawings.

Each figure shows an embodiment of the present invention.

As shown in Fig. 1, the rotation transmission mechanism 1 of the tool post
0 includes a plurality of rotary tool units 50 and non-rotary tools (not shown) mounted on a tool rest 11 that is fixed to a hollow rotating shaft 12 and indexed and rotated, and a rotary power transmission to the rotary tool unit 50. an intermediate gear mechanism 20 whose main elements include a main drive gear 15; an intermediate gear 21 that moves in the axial direction and meshes with the main drive gear 15 to transmit rotational power; and a shifter rod 22 of the intermediate gear mechanism 20. The cam 16 presses the intermediate gear 21 to mesh with the main drive gear 15.

A drive main shaft 14 that passes through the center of the rotating shaft 12 and is rotatably supported has a main drive gear 1 at its tip.
5 is installed.

On the other hand, the rotary tool unit 50 on which the peripheral flat portion 17 of the tool post is mounted has a tool holding member 5 at the tip.
An output shaft 54 having a diameter of 3 is rotatably held by the body 51, and an output gear 55 that is always in mesh with the intermediate gear 21 is attached near the rear end.

The intermediate gear mechanism 20 is interposed between the main drive gear 15 and the rotary tool unit 50.

The intermediate gear 21 is separated from the intermediate gear shaft 25 supported by bearings 23 and 24, and the intermediate gear 21 is coupled to the intermediate gear shaft 25 by a spline so as to be slidable in the axial direction.

The intermediate gear shaft 25 is hollow, and the tool rest 1
The boss part 25 is rotatably fitted on the back side of 1.
A shifter rod 22 is slidably fitted at the position a, and one end of the shifter rod 22 projects outward from the back surface of the tool rest 11 as a plunger portion 22a.

A spring bearing member 26 having a pawl clutch 26a provided on the outside is fitted onto the surface side of the tool rest 11 of the intermediate gear shaft 25, and is held by a restraining member 27 via a thrust bearing 31.

and a stepped portion 22b near the end of the shifter rod 22 opposite to the plunger portion 22a.
and the spring receiving member 26, the shifter first
A spring 28 is used to move the shifter rod 22 to the first position.
In the figure, it is always biased to the right.

On the other hand, a pin member 29 is fixedly inserted through the boss portion 21a of the intermediate gear 21 at right angles to the axial direction. Then, a second shifter spring 30 is interposed between the flange 22c provided at the lower part of the plunger portion 22a of the shifter rod 22 and the pin member 29,
The intermediate gear 21 and shifter rod 22 are biased in opposite directions.

Note that elongated holes 25b and 22d are formed in the intermediate gear shaft 25 and the shifter rod 22, respectively, in proportion to the amount of movement of the pin member 29.

On the other hand, a cam 16 for selecting the rotary tool unit 50 to be operated in a fixed position is provided on the back of the tool post 11, and the cam surface 16a is inclined in the direction of pressing the plunger portion 22a of the shifter rod 22. It's also there.

Next, the effect will be explained.

2 to 4 are explanatory diagrams of the operation of the intermediate gear mechanism 20, and in the state shown in FIG. 2, the shifter rod 22 is separated from the cam 16, and the main drive gear 15 is
and the intermediate gear 21 are completely separated from each other.

In the state shown in FIG. 2, the shifter rod 22 is pushed outward to the maximum extent by the pressing force of the first shifter spring 28, and the collar portion 22c abuts the lower part of the boss portion 25a of the intermediate gear shaft 25. At the same time, the pin member 29 of the intermediate gear 21 is in contact with one end of the elongated holes 22d and 25b.

When the rotary tool unit 50 is selected, the shifter rod 22 pressed by the cam 16 moves backward within the intermediate gear shaft 25, but the second shifter spring 30 always stretches the intermediate gear 21 and the shifter rod 22 in opposite directions. Therefore, if the intermediate gear 21 and the main drive gear 15 are in a well meshed position, the fourth
As shown in the figure, they immediately enter the engaged state.

However, when the intermediate gear 21 moves and approaches the main drive gear 15 to engage with it, if it is not in the meshing position properly and the teeth of both gears overlap, the intermediate gear 21 will move as shown in FIG. The pin member 29 of the gear 21 temporarily compresses the shifter second spring 30 like a cushion to take an instantaneous meshing standby position, and at the next moment, meshing is achieved and complete meshing occurs as shown in FIG. 4, and the main drive is activated. The rotational power of gear 15 is transmitted to intermediate gear 21 .

When the cam 16 is disengaged from the shifter rod 22, the first shifter spring 28 is released from the shifter rod 22.
is pushed out, one end of the elongated hole 22d of the shifter rod 22 pushes the pin member 29, and the meshing of the intermediate gear 21 is released.

As shown in FIG. 1, since the intermediate gear 21 and the output gear 55 of the rotary tool unit 50 always maintain a meshing state, the moment the main drive gear 15 and the intermediate gear 21 are meshed, the driving force is is transmitted to the output gear 55 side.

Note that the pawl clutch 26a of the spring bearing member 26 fitted to one end of the intermediate gear shaft 25 is provided for power transmission when a rotary tool is directly connected to this part instead of the rotary tool unit 50. It is.

"Effect of the invention" According to the rotation transmission mechanism in the tool post according to the invention, indexing and engagement and disengagement of the intermediate gear and the main drive gear are performed simultaneously using a simple cam mechanism, and the engagement and disengagement of the two is almost instantaneous. can be achieved, making a significant contribution to reducing processing time.

[Brief explanation of drawings]

Each figure shows an embodiment of the present invention.
4 to 4 are explanatory views of the operation of the intermediate gear mechanism. DESCRIPTION OF SYMBOLS 10... Rotation transmission mechanism of the tool post, 11... Tool post, 12... Rotating shaft, 14... Drive main shaft, 15...
... Main drive gear, 16 ... Cam, 16a ... Cam surface, 17 ... Turret peripheral flat part, 20 ... Intermediate gear mechanism, 21 ... Intermediate gear, 21a ... Boss part,
22... Shifter rod, 22a... Plunger part, 22b... Stepped part, 22c... Flange part, 22
d...Elongated hole, 25...Intermediate gear shaft, 25a...Boss portion, 25b...Elongated hole, 26...Spring receiving member, 2
6a... pawl clutch, 27... holding member, 28...
...Shifter first spring, 29...Pin member, 30...
...Shifter second spring, 31...Thrust bearing, 5
0...Rotary tool unit, 51...Body, 52
... End cover, 53 ... Tool holding member, 54
...Output shaft, 55...Output gear.

Claims (1)

[Scope of Claim for Utility Model Registration] A main drive shaft that is supported within a hollow shaft and transmits rotational driving force, a main drive gear provided at the end of the main drive shaft, and a main drive gear that is mounted on a tool rest and receives rotational power. A rotation transmission mechanism for a tool post comprising a rotary tool unit equipped with an output gear that rotates a tool, and an intermediate gear that is always meshed with the output gear and can be engaged with and disengaged from the drive gear by moving in the axial direction, A cam that moves the intermediate gear in the axial direction is disposed on the back side of the tool post, and a shifter rod that comes into contact with the cam and moves the intermediate gear is slidably fitted onto the central axis of the intermediate gear shaft. a first shifter spring is arranged inside the intermediate gear shaft to always press the shifter rod toward the cam, and the intermediate gear is slidably fitted to the intermediate gear shaft so that the intermediate gear is aligned with the axis. A spring receiving pin is passed through the shifter rod in a right angle direction, and an elongated hole is provided in the shifter rod to allow the spring receiving pin of the intermediate gear to pass through, and when the shifter rod is apart from the cam, the spring receiving pin is inserted into the shifter rod. A rotation transmission mechanism in a tool rest, characterized in that a second shifter spring is interposed between the spring receiving pin and a flange provided on the shifter rod so that the rear end of the elongated hole comes into contact with the rear end of the elongated hole.