JPH0749543Y2 - Rotation mechanism with less backlash - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a rotating mechanism with less backlash even when the shaft is rotated.

[Prior Art] Next, the configuration of the prior art will be described with reference to FIG.

In FIG. 3, 1 is a panel, 2 is a shaft, 7 is a pointer, 8 is a dial plate, 9 is a knob, 10 is a block, 11 is a holder, and 12 is a ball screw.

FIG. 4 is an assembly drawing of FIG. 3 and is assembled as follows.

The shaft 2 is rotatably attached to the panel 1, and a rotary resistor, a gear mechanism, etc., which are not shown, are attached to the end portion of the shaft 2.

The block 10 is provided with a through hole 10A into which the shaft 2 is inserted and is provided with a groove 10B in the radial direction, and the block 10 is fixed to the panel 1.

A through hole 11A into which the shaft 2 is inserted is formed in the holder 11, and the holder 11 is fixed to the shaft 2. That is, the holder 11 rotates with the shaft 2.

The dial plate 8 is attached to the knob 9, and the knob 9 is fixed to the tip of the shaft 2.

Next, FIG. 5 shows an assembled sectional view of the main part of FIG.

The ball screw 12 is screwed into the holder 11
A ball 13 is rotatably held at the tip of 12.

The ball 13 is pressed against the block 10 side by the spring 14.

[Problems to be Solved by the Invention] Next, FIG. 6 shows a relationship diagram between the block 10 and the ball 13.

FIG. 6 is a state diagram in which the ball 13 is in the groove 10B of the block 10 and the shaft 2 is in the reference position.

In FIG. 6, while the ball 13 is in the groove 10B,
There is no backlash because it is also close to the tip opening of the ball screw 12.

Next, FIG. 7 shows a change diagram of FIG.

FIG. 7 is a state diagram in which the shaft 2 is rotated from the state of FIG. 6 and the balls 13 are out of the groove 10B of the block 10.

In FIG. 7, the ball 13 is projected from the groove 10B, and a gap is created between the ball 13 and the tip opening of the ball screw 12 by that amount, resulting in backlash.

An object of this invention is to improve the conventional mechanism as shown in FIG. 3 so as to reduce the backlash of the rotating mechanism and to withstand vibration and shock.

[Means for Solving the Problems] In order to achieve this object, in the present invention, a shaft 2 rotatably held by a panel 1 and a shaft 2 are provided.
A block 3 fixed to the panel 1 is provided with a through hole 3A in which a groove 3B is inserted, a groove 3B is provided in the radial direction, a stopper piece 4 having a convex portion 4A that enters the groove 3B of the block 3, and a stopper piece 4
And a holder 6 to which the through hole 6A in which the shaft 2 is inserted and which is attached with the stopper piece 4 and which is fixed to the shaft 2 is attached.

[Operation] Next, a configuration diagram of the rotating mechanism according to the present invention will be described with reference to FIG.

In FIG. 1, 3 is a block, 4 is a stopper piece, 5 is a spring, 6
Is a holder, and other parts are the same as those in FIG.

The block 3 is provided with a through hole 3A into which the chaft 2 is inserted, and a groove 3B in the radial direction.
Is fixed to the panel 1.

The stopper piece 4 is formed with a convex portion 4A that enters the groove 3B of the block 3, and the stopper piece 4 is attached to the spring 5.

In FIG. 1, a leaf spring is used as the spring 5 in order to slide the stopper piece 4 with a constant pressure, but the leaf spring may not be a leaf spring. For example, a coil spring or the like can be used.

The holder 6 has a through hole 6A in which the shaft 2 is inserted,
A spring 5 with a stopper piece 4 is attached. The holder 6 is fixed to the shaft 2.

FIG. 2 is an enlarged assembly view of a main part of FIG.

The groove 3B of the block 3 is for 0-point positioning of the scale engraved on the dial plate 8. With the convex portion 4A of the stopper piece 4 in the groove 3B, the "0" display on the dial plate 8 and the pointer 7 Align with the arrow.

A constant pressure is applied to the stopper piece 4 by a spring 5.

When you turn the knob 9, the protrusion 4A of the stopper piece 4
Of the block 3 and slides on the surface 3C of the block 3 with a constant pressure.

Since the convex portion 4A of the stopper piece 4 of FIG. 1 is formed in a V shape, the resistance of sliding out of the groove 3B and the surface 3C of the block 3 is small.

The rotation torque of the knob 9 can be adjusted by changing the position of the holder 6 to which the spring 5 is attached.

[Advantage of Invention] According to this invention, since the convex portion 4A that fits in the groove formed in the block is attached to the stopper piece 4, it is possible to provide a rotating mechanism with less backlash, and the dial plate has a scale on the pointer. When combined, the shaft can be set with good reproducibility.

[Brief description of drawings]

FIG. 1 is a block diagram of a rotating mechanism according to the present invention, FIG. 2 is an enlarged assembly view of an essential part of FIG. 1, FIG. 3 is a block diagram of a prior art, and FIG. 4 is an assembly view of FIG. FIG. 7 is a sectional view of an assembly of essential parts of FIG. 3, FIG. 6 is a relationship diagram of the block 10 and the ball 13, and FIG. 7 is a change diagram of FIG. 1 ... Panel, 2 ... Shaft, 3 ... Block, 3A ...
… Through hole, 3B… Groove, 3C… Face, 4… Stopper piece, 4A
...... Convex part, 5 ... Spring, 6 ... Holder, 6A ... Through hole,
7 ... pointer, 8 ... dial plate, 9 ... knob.

Claims (1)

[Scope of utility model registration request] 1. A panel (1) is provided with a shaft (2) rotatably held and a through hole (3A) into which the shaft (2) is inserted, and a groove (3).
B) is provided in the radial direction and is fixed to the panel (1), a stopper piece (4) having a convex portion (4A) that enters the groove (3B) of the block (3), and a stopper piece A spring (5) to which (4) is attached, a through hole (6A) into which the shaft (2) is inserted, and a spring (5) to which a stopper piece (4) is attached are attached and fixed to the shaft (2). 6) A rotating mechanism with less backlash, which comprises: