JPS6221762Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a latch mechanism that allows a rotary table to be accurately stopped at any angle.

The latch mechanism of a conventional rotary table is shown in Figure 1.
As shown in FIG. 2, a notch 2 provided on the periphery of the rotary table 1, and
There is a stopper type one consisting of a stopper 3 for preventing rotation, and a disk 1' having a hole 2' for a steel ball 4 inserted in the lower surface of the rotary table 1 as shown in FIGS. 3 and 4. When the rotary table 1 rotates, the steel ball 4 is pushed into the hole 2' by the force of the spring 5, and the rotary table 1 is
There was a steel ball method for latching.

However, in the stopper method, the rotary table 1
When rotating, hold down stopper 3,
It was necessary to prevent the stopper 3 from entering the notch in the rotary table 1, which was very troublesome when rotating the rotary table 1 by 180 degrees. Also, in this method, if the width of notch 2 and the width of stopper 3 are made the same, it becomes difficult for stopper 3 to enter notch 2. teeth,
There was a drawback that the table did not latch securely when it was latched, causing play. on the other hand,
In the steel ball method, the degree of fixation when latched is determined by the strength of the spring 5 and the shape of the hole 2', so it is necessary to accurately machine the hole 2' on the surface of the disc 1'. There was a problem that it was difficult to machine the hole for the required latch strength.
Furthermore, in order to smoothly move the steel ball 4 in and out of the hole 2', it is desirable that the edge of the hole 2' be chamfered to form a curved surface, but this also poses the problem of difficulty in machining.

The present invention was devised to solve these problems.The notch for the latch is provided on the side of the rotary table, making it much easier to process than the conventional one, and the shape is also easier. What is needed can be machined, chamfering is easy, and the pressing force of the rotary roller that enters the cut and performs the latching action against the rotary table is a large force that is magnified compared to the elasticity of the spring. It allows for subtle and arbitrary adjustment, and is much superior to conventional latch mechanisms.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. FIG. 5 is a perspective view of the embodiment of the present invention, and FIG. 6 is a plan view of the fixed table 10.
A plurality of notches 12 for latching are recessed in the peripheral wall surface of the rotary table 11, which is rotatably supported on a shaft (not shown).

The cam roller 13 that enters the notch 12 and latches the rotary table 11 is supported by a shaft 14 on the fixed table 10, and bent in a dogleg shape toward the peripheral wall of the rotary table in a plane parallel to the surface of the fixed table. After that, the arm 15 is rotatably supported by a shaft at a bent portion of the central portion. A spring mounting hole 17 is provided at the free end of the arm 15.
One end of a spring 16 is attached, which is stretched substantially parallel to the tangential direction of the peripheral wall surface of the rotary table 11. The other end of the spring 16 is attached to a bracket 18, and a screw 20 for adjusting the tension of the spring is attached to this bracket, and this screw 20 is screwed into a fixing block 19 with a female thread. ing. The bracket 18 is sandwiched between two guides 21 extending from the fixed block 19, and is configured so as not to rotate with the rotation of the screw 20.

The present invention is configured as described above, and has the fifth aspect.
When the rotary table 11 is rotated from the state shown in the figure, the cam roller 13 comes off the notch 12 in the peripheral wall of the table while stretching the spring 16, rotates on the peripheral wall surface of the table, and enters the next notch 12. At this time, if no further rotational force is applied, the rotary table 11 will be latched. The pressing force of the cam roller 13 against the table peripheral wall can be adjusted by changing the tension of the spring 16 with a screw. When the screw 20 is rotated and the bracket 18 is moved forward, the tension of the spring between the bracket and the arm 15 is weakened, so that the arm 1
The pressing force of the cam roller 13 located at the center of the table 5 against the table peripheral wall becomes weaker. At this time, the two guides 21 prevent the bracket 18 from rotating together with the screw 20, so that the bracket 18 can only move forward and backward.

Conversely, if it is desired to increase the pressing force of the cam roller 13, it is sufficient to simply rotate the screw 20 in the opposite direction to that described above and increase the tension of the spring 16.

In this invention, a notch for the latching effect is provided on the peripheral wall of the rotary table, making machining much easier compared to the conventional latching method, and making it possible to accurately process the shape of the notch according to the degree of latching. In addition to this, chamfering the notch has also become extremely easy. In addition, since the cam roller is supported by an arm, a spring is attached to the tip of the arm, and a tension adjustment device is provided on the spring, the pressing force of the cam roller can be expanded to a larger force than the elasticity of the spring due to the principle of leverage. As a result of being able to expand, fine adjustments can be made over a wide range, and the strength of the latch can be adjusted as needed.

The arm is bent in a dogleg shape toward the peripheral wall of the rotary table in a plane parallel to the surface of the fixed table, and a cam roller is attached to the bent part of the arm. Since the latch mechanism is stretched in a direction substantially parallel to the tangential direction of the peripheral wall surface, it also has the effect of reducing the area required for installing the latch mechanism.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional stopper type latch mechanism, Figure 2 is a side view of its main mechanism, Figure 3 is a perspective view showing a conventional steel ball type latch mechanism, and Figure 4 is a perspective view showing a conventional stopper type latch mechanism. Vertical sectional view showing the main mechanism, No. 5
The figure is a perspective view of the latch mechanism of the present invention, and FIG. 6 is a plan view of the present invention. 10... Fixed table, 11... Rotating table, 12... Notch, 13... Cam roller, 1
2'... Chamfered part, 14... Shaft, 15... Arm, 16... Spring, 18... Bracket,
19... Fixed block, 20... Screw, A... Tension adjustment device.

Claims (1)

[Scope of utility model registration request] Facing the rotation trajectory of the peripheral wall of a rotary table having a plurality of latching notches in the peripheral wall, the peripheral wall of the rotary table is pivotably supported at one end by a fixed table, and in a plane parallel to the surface of the fixed table. An arm bent in a dogleg shape toward This is a rotary table in which a spring that brings the cam roller into elastic contact with the peripheral wall of the rotary table is stretched in a direction substantially parallel to the tangential direction of the peripheral wall surface, and the spring is equipped with a tension adjustment device. Latch mechanism.