JPH08252734A - Mechanical stopper - Google Patents

Abstract

PURPOSE: To provide a mechanical stopper in which accuracy and reliability are compatible with each other. CONSTITUTION: This mechanical stopper is constituted of an intermediate part 3 arranged between a rotary part 1 and a fixed part 2, a first joint part 4 allowing relative rotational displacement of both in a territory A in which a pin 41 can float in a recessed groove 41, and a second joint part 5 allowing relative rotational displacement of both in a territory B in which a pin 51 can float in a recessed groove 51. The rotatable range of the rotary part 1 is the angle 360 deg.+α (α is about 180 deg.) which is the sum of a rotional angle about 270 deg. corresponding to the floating territory A of the first joint part 4 at rotating by itself and a rotational angle about 270 deg. corresponding to the floating territory B of the second joint part 5 at rotating while dragging the intermediate part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical stopper used as a rotary table stopper, a motor stopper, or the like.

[0002]

2. Description of the Related Art A stopper is provided when it is necessary to stop a rotating portion at a predetermined position. When the rotation area of the rotating part is smaller than 360 °, it is sufficient to project a pin or the like for forcibly stopping the rotating part at the start end and the end, but the rotating part is placed at a rotating position exceeding 360 °. If you want to stop it, you need to devise it. As a method for that purpose, conventionally, a method of electrically / optically detecting a position and a method of mechanically locking the position are known.

In the former, a light-shielding plate is attached so that it can rotate integrally with the rotating portion, and a photosensor including a combination of a light-emitting source and a light-receiving element is provided at a position where the light-shielding plate comes when the rotating portion rotates by a certain angle. Place it. Then, when the light entering the light receiving element of this photo sensor is blocked by the light blocking plate, the electrical control system operates,
The rotating part is forcibly stopped.

On the other hand, in the latter, as shown in FIGS. 10 to 12, the cord b is made to stand by in a state where the cord b is slackened at a position where the cord a is rotated by more than 360 ° and the cord b is rotated by the cord a. The hooking protrusion c that is projected from is wound around to forcibly stop the rotating portion a.

[0005]

However, according to the former configuration, there is an inconvenience that the rotating part cannot be stopped when the control system malfunctions, and furthermore, the rotating part stops during the rotation due to the disturbance signal. There is a possibility that it is not reliable.

Further, according to the latter configuration, it is difficult to make an adjustment for stopping the rotating portion a at a predetermined position, that is, an adjustment of the tension of the string b, and a highly accurate stopper is constructed. There is a drawback that you cannot do it.

An object of the present invention is to provide a mechanical stopper which effectively eliminates these problems.

[0008]

In order to achieve the above object, the present invention employs the following configuration.

That is, the mechanical stopper according to the present invention is for limiting the rotation of the rotating portion to a fixed area, and includes a fixed portion which is arranged close to the rotating portion and faces each other.
An intermediate portion disposed between the rotating portion and the fixed portion, and a first joint portion that connects the intermediate portion and the rotating portion and allows relative rotational displacement of the both in a fixed floating region,
It is characterized by comprising a second joint portion which connects the intermediate portion and the fixed portion and allows relative rotational displacement of the both in a fixed floating region.

As a concrete embodiment, the first joint has a structure in which the convex portion provided on one of the rotating portion and the intermediate portion is engaged with the concave groove provided on the other portion, and the second joint is formed. The joint may have a structure in which a convex portion provided on one of the intermediate portion and the fixed portion is engaged with a concave groove provided on the other.

[0011]

Now, the rotating portion is connected to the intermediate portion at the starting end side of the floating area of the first joint portion, and the intermediate portion is connected to the fixed portion at the starting end side of the floating area of the second joint portion. Suppose When the rotating portion starts to rotate from this state, first, the rotating portion is rotatable relative to the intermediate portion within the floating region of the first joint portion, and therefore rotates without dragging the intermediate portion. Then, the connecting position at the end of the floating region is reached. On the other hand, since the intermediate portion can rotate relative to the fixed portion within the floating area of the second joint portion, when the rotating portion comes into contact with the end of the floating area, the rotating portion now drags the intermediate portion. Further rotation is possible. When the intermediate portion reaches the end of the floating region of the second joint portion, the fixed portion restrains the rotation of the intermediate portion, the intermediate portion restrains the rotation of the rotating portion, and the rotating portion is forced to that position. To be stopped.

Therefore, the rotating portion can rotate at an angle equal to the sum of the rotating angle corresponding to the floating area of the first joint portion and the rotating angle corresponding to the floating area of the second joint portion. . The floating area of each joint can be set independently of each other and is 360 ° unless the start end and the end are continuous.
Since they can be set close to each other, the rotation angle including both floating regions can be expanded to near 720 ° at the maximum.

On the other hand, when the rotating portion rotates in the opposite direction from the forced stop position, the above-described operation occurs in reverse from the end of the floating region toward the starting end, and the rotating portion is forcibly stopped at the starting end. Then, the rotation angle of the rotating portion at that time is equal to the rotation angle described above.

[0014]

Embodiments of the present invention will be described below with reference to FIGS.

<First Embodiment> The mechanical stopper shown in FIGS. 1 and 2 is for limiting the rotation of the motor M to a fixed region, and includes a rotating portion 1, a fixed portion 2, and an intermediate portion 3.
And a first joint portion 4 and a second joint portion 5.

The rotating portion 1 is a disc-shaped member having a central portion axially attached to a rotation axis m of the motor M, and can rotate integrally with the motor M.

The fixed portion 2 is a disk-shaped member which is arranged in parallel with its center aligned with the rotation axis m of the rotating portion 1 and is attached to an appropriate place so as not to rotate.

The intermediate portion 3 is rotatably attached to the center of the lower surface 21 of the fixed portion 2 so that the fixed portion 2 and the rotary portion 1 can be rotated.
And a disk-shaped member arranged in parallel between the upper surface 32 and the upper surface 32 of the rotating portion 1 so that the lower surface 31 faces the upper surface 11 closely.
Are closely opposed to the lower surface 21 of the fixed plate 2.

The first joint portion 4 is provided with a pin 41 which is a convex portion projecting from the axial center m on the upper surface 11 of the rotary portion 1 at a position radially offset from the axial center m on the lower surface 31 of the intermediate portion 3. It is provided with a concave groove 42 having a partial arc shape engraved at a position deviated in the radial direction. The deviation amount of the concave groove 42 from the axis m is equal to that of the pin 41, and the groove width of the concave groove 42 is equal to that of the pin 4.
The diameter is set to be slightly larger than the diameter of 1. Further, the length of the pin 41 is set so that the tip end thereof can partially enter the groove 42 at the mounting position.
Then, the rotating portion 1 and the intermediate portion 3 are connected via the pin 41 and the concave groove 42, and the floating region A between the position where the pin 41 is engaged with one end of the concave groove 42 and the position where the pin 41 is engaged with the other end thereof. The relative rotational displacement of the rotating portion 1 and the intermediate portion 3 is allowed inside.

The second joint portion 5 has a groove 52 formed in a partial arc shape on the upper surface 32 of the intermediate portion 3 at a position radially offset from the axis m, and a center of the lower surface 21 of the fixed portion 2. It is provided with a pin 51 which is a convex portion projecting at a position deviated from m in the radial direction. The amount of deviation of the groove 52 from the axis m is equal to that of the pin 51, and the groove width of the groove 52 is the width of the pin 5.
The diameter is set to be slightly larger than the diameter of 1. Further, the length of the pin 51 is set so that the tip end thereof can partially enter the groove 51 at the mounting position.
Then, the intermediate portion 3 and the fixed portion 2 are connected via the pin 51 and the concave groove 52, and the floating region B between the position where the pin 51 is engaged with one end of the concave groove 52 and the position where it is engaged with the other end. The relative rotational displacement of the intermediate portion 3 and the fixed portion 2 is allowed therein.

In the present embodiment, the first joint portion 4
The floating area A of the second joint portion 5 is determined by the length of the groove 42 and the diameter of the pin 41.
Is determined by the length of the groove 52 and the diameter of the pin 51,
By appropriately defining these, the floating angles corresponding to these floating regions A and B are set to be approximately 270 °, respectively. In addition, in this embodiment, the first joint portion 4
Is formed at a position closer to the axis m than the second joint portion 5,
Care is taken not to concentrate the thickness loss portion due to the concave grooves 42 and 52 on the intermediate portion 3.

Next, the operation when the rotating portion 1 rotates counterclockwise in plan view and is forced to stop will be described. In the initial state, the rotating portion 1 is connected to the intermediate portion 3 on the side of the starting end A1 of the floating area A of the first joint portion 4 as shown in FIG.
Is the fixed portion 2 on the side of the starting end B1 of the floating region B of the second joint portion 5.
Shall be connected to. When the rotating portion 1 starts to rotate from this state, first, the pin 41 floats along the concave groove 42 in the floating area A of the first joint portion 4, and the rotating portion 1 rotates without dragging the intermediate portion 3. can do. And
After rotating about 270 °, the pin 41 reaches the end A2 of the floating area A with respect to the groove 42 as shown in FIG. On the other hand, since the intermediate portion 3 is rotatable relative to the fixed portion 2 in the floating area B of the second joint portion 5, when the rotating portion 1 comes into contact with the end A2 of the floating area A, the rotating portion 1 Can now rotate further while dragging the intermediate part 3. Then, the intermediate portion 3 rotates by approximately 270 ° and the concave groove 52 becomes the pin 5
1 reaches the end B2 of the floating region B of the second joint portion 5 as shown in FIG. As a result, the fixed portion 2 restrains the rotation of the intermediate portion 3, the intermediate portion 3 restrains the rotation of the rotating portion 1, and the rotating portion 1 is forcibly stopped at that position.

Therefore, the rotating part 1 can rotate
A rotation angle corresponding to the floating area A of the first joint portion 4 when rotating independently, and a rotation corresponding to the floating area B of the second joint portion 5 when rotating while dragging the intermediate portion 3. Angle of about 270 ° and 360 °
+ Α (α is approximately 180 °).

On the other hand, when the rotating portion 1 rotates in the opposite direction from the forced stop position, the relative rotation of the rotating portion 1 with respect to the intermediate portion 3 from the terminal end A2 of the floating region A of the first joint portion 4 to the starting end A1. After the occurrence, the floating area B of the second joint portion 5
From the end B2 to the start B1 of the fixed portion 2 of the intermediate portion 3
Relative rotation with respect to, resulting in an angle of the rotating part 1;
It is reversely rotated by -360 ° -α and is forcibly stopped exactly at the position described at the beginning.

As described above, in the mechanical stopper of the present embodiment, if the diameters of the pins 41 and 51 and the lengths of the concave grooves 42 and 52 are accurately defined, the rotary portion 1 is moved in the forward and reverse directions by approximately 1 mm.
A function of forcibly and surely forcibly stopping at a half-turned position can be performed. Moreover, since this is composed of only mechanical element parts and there is no need to use electrical / optical element parts as constituent elements, there is no fear of malfunction,
High reliability can be demonstrated.

In the above description of the operation, for the sake of convenience, it was explained that the floating motions of the first and second joint portions 4 and 5 occur independently and in sequence, but in reality, the joints are caused by the sliding resistance during the floating motion. There is a possibility that the floating motion of the portion 4 and the floating motion of the joint portion 5 simultaneously proceed. However, since the arrival points of the floating regions A and B are unchanged, the forced stop position of the rotating unit 1 is not influenced by the progress of the floating motion. Similarly, when the sliding resistance of the second joint portion 5 is much smaller than the sliding resistance of the first joint portion 4, the floating motion of the second joint portion 5 is the first joint portion. Four
It is of course conceivable that the floating motion occurs and completes before the floating motion, but the situation is exactly the same in this case as well.
Also, the angle setting is not limited to the above.

<Second Embodiment> Next, another embodiment of the present invention will be described with reference to FIGS.

The mechanical stoppers shown in FIGS. 6 and 7 also rotate the motor M in the forward and reverse rotation angles; 360 ° +
It is for restricting to the range of α, and the basic configurations of the rotating portion 101 and the fixed portion 102 are the same.

Then, a pin 103, which is an intermediate portion, is arranged in an upright state between the rotating portion 101 and the fixed portion 102 and at a position deviated from the axis m in the radial direction, and between the pin 103 and the rotating portion 101. The first joint portion 104, and the pin 1
The second joint portion 105 is configured between the fixed portion 103 and the fixing portion 102.

The first joint portion 104 comprises a lower end 141 of the pin 103 and a concave groove 142 formed in the upper surface 111 of the rotating portion 101 and having a partial arc shape. The lower end 141 of the pin is engaged with the groove 142 and is movable.
The angle from the starting end C1 to the terminating end C2 of the floating area C (see FIG. 8) is approximately 270 ° by defining the diameter of the pin lower end 141 and the length of the concave groove 142 as in the above embodiment.
Is set to.

The second joint portion 105 is provided with an upper end 151 of the pin 103 and a concave groove 152 formed in the lower surface 121 of the fixing portion 102 and having a partial arc shape. The upper end 151 of the pin is engaged with the groove 152 and can move freely.
The angle from the starting end D1 to the terminating end D2 of the floating region D (see FIG. 9) is set to approximately 270 ° by similarly defining the diameter of the pin 151 and the length of the concave groove 152.

Also in this embodiment, the rotating portion 101 can rotate counterclockwise about 270 ° with respect to the pin 103, and the pin 103 can rotate about 270 ° in the same direction with respect to the fixed portion 102. Therefore, the rotating part 101 can rotate 360 ° + α (α is approximately 180 °) with respect to the fixed part 102. Then, at that position, the pin 103 has the end C2 of the first floating area C and the end D2 of the second floating area D.
To engage the concave grooves 142 and 152, respectively,
1 is restrained by the fixed portion 102 via the pin 103, and the rotating portion 101 is forcibly stopped at that position.
Of course, in the case of reverse rotation, the same operation is performed,
The result is the same when the floating motion of either floating region C or D precedes or when the floating motions of both floating regions C and D proceed simultaneously.

Even with such a structure, the stopper can be composed of only mechanical element parts.
Not only the accuracy but also the reliability can be surely improved. Moreover, according to this embodiment, the number of parts is smaller than that of the above-mentioned embodiment, which is also useful in reducing the number of working / assembling steps and cost.

In this embodiment, since the pin 103 may be tilted, the upper surface 111 of the rotating portion 101 or the fixed portion 10 is located near the upper end and the lower end of the pin 103.
It is also effective to provide a flange having a diameter such that it slidably contacts the lower surface 121 of No. 2 and does not fall into the concave grooves 142 and 152.

Although the two embodiments of the present invention have been described above, the specific structure of each part is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention. Is. For example, in the above-mentioned embodiment, the joint portion is composed of the engaging structure of the pin and the concave groove, but instead of the pin, a projection having an arc shape may be engaged with the concave groove.

[0036]

As described above in detail, the mechanical stopper of the present invention has a rotating portion, an intermediate portion, a first joint portion, and a second joint portion.
By assembling each mechanical element of the joint portion and the fixed portion and appropriately setting the floating area in the joint portion, the rotating portion can be surely forcibly stopped at a desired rotation position. Therefore, there is an excellent effect that both reliability and accuracy as a stopper can be achieved at a high level.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is an operation explanatory view corresponding to FIG.

FIG. 5 is an operation explanatory view corresponding to FIG.

FIG. 6 is a perspective view showing another embodiment of the present invention.

FIG. 7 is a front view of the same.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7;

FIG. 9 is a plan view of the embodiment.

FIG. 10 is a front view showing a conventional example.

FIG. 11 is a bottom view of the same.

FIG. 12 is an explanatory view of the same operation.

[Explanation of symbols]

 1, 101 ... Rotating part 2, 102 ... Fixed part 3, 103 ... Intermediate part 4, 104 ... First joint part 5, 105 ... Second joint part A, B, C, D ... Floating region

Claims (1)

[Claims] 1. A mechanical stopper for limiting the rotation of a rotating portion to a fixed region, wherein a fixed portion is disposed adjacent to and facing the rotating portion and an intermediate portion disposed between the rotating portion and the fixed portion. And a first joint portion that connects the intermediate portion and the rotating portion and allows relative rotational displacement of the both in a constant floating region, and connects the intermediate portion and the fixed portion and provides a constant floating movement. A mechanical stopper comprising: a second joint portion that allows relative rotational displacement of the both in a region.