JPH0366096B2 - - Google Patents

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a screw adjustment device for adjusting the vertical position of a screw.

(Prior Art) Some mechanical work involves adjusting the vertical position of a screw attached to a mechanical component to adjust the condition of an electrical component connected to the screw.

As shown in FIG. 3, a screw adjusting device used for adjusting such screws is provided with a cylindrical rotating frame a connected to an elevating mechanism and a rotational drive source (none of which are shown) in the vertical direction. In addition to movably fitting the driver bit b into the rotary frame a, a pin c protruding from the outer periphery of the driver bit b can be slid freely into a long hole d in the vertical direction provided on the peripheral wall of the rotary frame a. A fitted structure is used. and,
After a minus-shaped engaging portion e formed at the tip of the driver bit is engaged with a screw head (not shown), the screw is screwed in by applying a rotational force to the rotating frame a.

(Problems to be Solved by the Invention) By the way, when setting the tip of the driver bit b onto a screw, there is some misalignment between the tip of the driver bit b and the screw head.

However, in the case of a screw adjustment device in which the driver bit b remains rigid on the axis until the end (from groove insertion to rotation) as mentioned above, if even a slight misalignment occurs, the driver bit b remains fixed with the misalignment. It turns the screw. Therefore, due to the torque from the driver bit b, extra force is applied to the screw in the vertical and horizontal directions, making it impossible to rotate the screw with high precision. In particular, this can cause electrical signals to become disjointed, etc.
There is a possibility that adjustment cannot be made at all.

This invention was made with attention to these problems, and its purpose is to precisely rotate a screw without applying extra force in the horizontal or vertical direction, regardless of slight misalignment. The object of the present invention is to provide a screw adjusting device that can be used.

[Structure of the Invention] (Means and Effects for Solving Problems) The present invention provides a screw adjustment device for adjusting the amount of rotation of a screw having a groove formed in its head, which is driven and moved at least in the vertical direction. A support part, a rotating shaft rotatably supported by the supporting part and arranged vertically, a spline nut coaxially attached to the bottom of the rotating shaft, and a rotating shaft that moves along the axial direction on the spline nut. A freely fitted spline shaft, a first locking portion provided at the upper end of the spline shaft and regulating the downward movement of the spline shaft through contact with the spline nut, and a lower end of the spline shaft. a universal joint provided at the screw head; a driver bit connected to the spline shaft via the universal joint and having an engaging portion at a lower end that fits into a groove formed in the head of the screw; a drive source that rotates a rotating shaft; a guide cylinder that is fitted onto the lower end of the driver bit so as to be movable along the axial direction and guides the head of the screw so that it matches the position of the driver bit;
a second locking portion provided on the lower end side of the driver bit and regulating the tip of the guide tube at a position protruding from the tip of the engaging portion by contacting with the guide tube; and a second locking portion that slides on the rotating shaft. a cylindrical first slider that is freely fitted onto the outside; a first biasing means that biases the first slider toward the driver bit; and a guide tube provided at the bottom of the first slider. an engaging and disengaging portion that detachably engages with and transmits the biasing force of the first biasing means via the first slider to the guide tube; The first
a second slider fitted into the upper end of the locking portion so as to be able to move toward and away from the upper end of the locking portion; and a second biasing force that urges the second slider to contact the first locking portion. means, a pin protruding from the outer peripheral surface of the second slider in a direction perpendicular to the axial direction of the rotating shaft, a peripheral wall of the rotating shaft corresponding to the position of the pin, and the first slider. an elongated hole provided in the peripheral wall of each of the pins, through which the tip of the pin is movably inserted loosely in the axial direction of the rotary shaft, and the rotation of the rotary shaft is transmitted to the first slider;
The slider is moved upward against the biasing force of the first biasing means, and as the first slider moves upward, the pin comes into contact with the elongated hole, thereby causing the second biasing force to move upward. moving the second slider upward against the biasing force of the biasing means to separate the first slider from the guide tube and also separate the second slider from the first locking portion; By providing a moving mechanism, the screw can be rotated precisely without applying any extra external force to the screw.

(Example) The present invention will be described below based on an example shown in FIGS. 1 and 2. Figure 1 shows the configuration of the screw adjustment device, 1 is the base (corresponding to the support part)
It is. The base 1 is connected to an elevating mechanism 2 and can move up and down. A rotary shaft 3 is rotatably supported on the base 1 in the vertical direction. In addition, 4,
4 is a bearing for rotatably supporting the rotating shaft 3.

A pulse motor 5 (corresponding to a drive source) is connected to the upper end of the rotating shaft 3 protruding from the base 1. Further, the lower end side of the rotating shaft 3 is formed into a cylindrical shape, and a ball spline 6 is attached to the lower end.
(corresponding to a spline part) is provided. Specifically, a ball spline nut 7 is installed along the axial direction at the end of the rotating shaft 3, and a ball spline shaft 8 mated with the ball spline nut 7 is secured to a retaining nut 9 (corresponding to a first locking part). ) to allow it to hang freely up and down. A driver bit 11 is connected to the lower end of this ball spline shaft 8 via a universal joint 10 (equivalent to a universal joint), and a pulse motor 5 is used to form a driver bit 11 on the large diameter portion at the tip of the driver bit 11. In addition, the substantially negative-shaped engaging portion 12 can be rotated. Of course, the engaging portion 12 is a substantially minus-shaped groove (not shown) formed in the head of the screw 13 to be adjusted.
A type with an external shape that can be connected to and disconnected from it is used.
A guide tube 14 is fitted over the outer circumference of the engaging portion 12 to the outer circumference of the narrow shaft portion directly above the engaging portion 12 and has an inner diameter corresponding to the outer diameter. Note that the guide tube 14 is connected to the stepped portion 1 of the driver bit 11.
1a (corresponding to the second locking part) is used as the locking part for positioning, and in normal state, the tip part is the locking part 1a (corresponding to the second locking part).
2, the length of which is determined so as to protrude somewhat from the tip of the tube is used, so that the engaging portion 12 can be guided to the screw head by the guiding effect of the cylinder. However, a tapered relief 14a is formed on the inner circumferential surface of the tip end of the guide tube 14 for a guiding effect.

Further, a substantially bottomed slider 15 (corresponding to a first slider) is movably fitted into the outer peripheral portion of the lower part of the rotating shaft 3. Furthermore, a rod-shaped slider 16 (corresponding to a second slider) is slidably provided in the cylindrical internal space above the retaining nut 9. A coil spring 17 (corresponding to second biasing means) is interposed in a compressed state behind the slider 16, and pushes the ball spline shaft 8 downward through the slider 16. Further, a coil spring 20 (corresponding to the first biasing means) is placed in a compressed state between the flange portion 18 provided at the upper end of the slider 15 and the spring seat 19 provided on the outer periphery of the rotating shaft 3 directly above the flange portion 18. ) is provided to push down the entire slider 15. In response to this biasing force, the cone-shaped hole 21 (corresponding to the engaging and disengaging section) formed in the bottom wall of the slider 15 is moved into the guide cylinder 1.
4, and is in close contact with the inverted cone-shaped convex portion 21a formed at the upper end of the slider 16.
In addition to the energizing force, the movement of the driver bit 11 on the axis can be restricted (the driver bit 11 is rigid on the axis).

Further, a pin 22 is provided in the shaft portion on the tip side of the slider 16 so as to pass therethrough in a direction perpendicular to the axis of the slider 16 . And this pin 2
The ends of the slider 1 protrude outward from elongated holes 23 along the vertical direction, which are provided in the peripheral walls of the rotating shaft 3 and the slider 15 in correspondence with the respective through ends.
5 can be rotated together with the rotating shaft 3.

On the other hand, 24 is a moving mechanism installed on the lower surface of the base 1 adjacent to the rotating shaft 3, as shown in FIG. 2A. The moving mechanism 24 includes, for example, an air cylinder 25 (driving source) installed on the lower surface of the base 1, and a roller 26 directly below the flange portion 18 of the slider 15. A structure is used in which the piston end of the air cylinder 25 and the roller 26 are connected by a link 28 with a fulcrum 27 formed in the center, and by driving the piston end of the air cylinder 25 toward the protruding side, the slider 15 Also, the slider 16 can be lifted. By raising the sliders 15 and 16, the driver bit 1
Universal joint 1 by lifting the regulation of 1.
This allows the driver bit 11 to become free (driver bit 11 becomes free).
A control unit 29 (consisting of a microcomputer, etc.) is connected to the drive circuit (not shown) of the air cylinder 25, and the tip of the driver bit 11 remains rigid until it enters the screw 13, and after it enters the screw 13. The driver bit 11 can be placed in a free state. In other words, these moving mechanisms 24, sliders 15, 1
6, the pin 22, the elongated hole 23, the control section 29, and the like constitute the entire bit regulating mechanism.

Although detailed explanation will not be given, the control unit 29
It also controls the operation of the pulse motor 5 and lifting mechanism 2 necessary for screw adjustment.

Next, the operation of the screw adjusting device configured as described above will be explained based on FIG. 2. First, it is assumed that the screw 13 to be adjusted is placed below the driver bit 11. After this, first, from this state, the base 1 is lowered by the operation of the lifting mechanism 2,
Lower the driver bit 11 along with the entire mechanism.

Here, since the moving mechanism 24 is not operating (the roller 26 is descending), this state of starting the downward movement is a state in which the driver bit 11 is regulated on the axis by the elastic force of the coil springs 17 and 20. Become. Specifically, the slider 16 is pressed against the rear end of the ball spline shaft 8 by the elastic force of the coil spring 17, and the slider 16 is pressed against the rear end of the ball spline shaft 8 by the elastic force of the coil spring 17.
5 is pressed by the elastic force of the coil spring 20, and the driver bit 11 becomes taut on the axis. Note that at this time, the tip of the guide tube 14 slightly protrudes from the tip of the engaging portion 12.

Then, as the decline continues, the second
As shown in Figures A and B, the tip of the guide tube 14 is pressed against the head of the screw 13. Here, the screw head is guided into the guide tube 14 due to the relief 14a at the tip. At the same time, the misalignment between the driver bit 11 and the screw 13 is absorbed by the amount of elastic deformation of the entire system and the backlash of each part, and the positions of the driver bit 11 and the screw 13 are brought into alignment.

Then, as the descent progresses further, the coil spring 17
is contracted, and the tip of the engaging portion 12 is pressed against the head of the screw 13. Thereafter, by stopping the lowering and rotating the rotary shaft 3 with the pulse motor 5 from this state, the driver bit 11 is rotated via the ball spline nut 7, the ball spline shaft 8, and the universal joint 10. , the tip of the engaging portion 12 will fit into the groove of the screw head.

After this, use the air cylinder 25 to move the roller 2
6 is pushed up, the slider 15 is pushed up due to contact with the flange portion 18, and the hole 21 of the slider 15 is separated (separated) from the convex portion 21a of the guide tube 14, as shown in FIG. go.

Only in this state will the universal joint 10 function and the driver bit 11 and screw 1
3 is absorbed by this universal joint 10. By this absorption, the horizontal force applied to the screw 13 is removed.

As the slider 15 further rises, the lower ends of the elongated holes 23, 23 finally come into contact with the pins 22 and push up, causing the slider 16 to move upward. As a result, the slider 16 separates (separates) from the retaining nut 9 as shown in FIG.
Then, the force of the coil spring 17 no longer acts on the driver bit 11. In other words, the vertical force applied to the screw 13 is the sum of the weights of the driver bit 11, universal joint 10, ball spline shaft 8, guide tube 14, and retaining nut 9. However, in the case of vertical force,
Strictly speaking, there is also a frictional force between the ball spline shaft 8 and the ball spline nut 7, but this is ignored because it is small.

However, if the weight is kept small, the force applied to the screw 13 will be small, and it will not have to affect the adjustment of the screw 13.

Therefore, if the driver bit 11 is rotated using the pulse motor 5 in such a state, the screw 13 can be rotated without applying almost any extra external force. In other words, adjustment can be made by precisely rotating the screw 13.

However, in FIG. 2, each of A and B indicates the amount by which the slider 15 gradually rises.

Although the ball spline 6 is used in the above-mentioned embodiment, a general spline may be used as long as the shaft is vertically movable and rotation can be transmitted.

Furthermore, it goes without saying that a universal joint other than the universal joint 10 may be used, and the base 1 may be moved in the left-right direction to guide the driver bit 11 to the screw 13.

[Effects of the Invention] As explained above, according to the present invention, when adjusting a screw, it is possible to adjust the screw without applying extra force to the screw in the horizontal or vertical direction, regardless of the slight misalignment.
The screw can be rotated. Therefore, the load on the screw is small and the screw can be rotated with precision.

As a result, precise adjustments can be made.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, and FIG. 1 is a sectional view showing the structure of a screw adjusting device;
FIG. 2 is a partially sectional front view and sectional view sequentially showing the adjustment process using the screw adjustment device, and FIG. 3 is a perspective view showing the conventional screw adjustment device. DESCRIPTION OF SYMBOLS 1...Base (support part), 6...Ball spline, 7...Spline nut, 8...Spline shaft, 9...Nut (first locking part), 10...
Universal joint (universal joint), 11...
Driver bit, 11a... step part (second locking part), 12... engaging part, 13... screw, 14...
Guide cylinder, 15... slider (first slider), 16... slider (second slider),
17... Coil spring (second biasing means), 20...
... Coil spring (first biasing means) 21 ... Hole (engaging and disengaging portion), 22 ... Pin, 23 ... Long hole, 24 ...
...Movement mechanism.

Claims (1)

[Scope of Claims] 1. A screw adjusting device for adjusting the amount of rotation of a screw having a groove formed in its head, comprising: a support portion that is driven and moved at least in the vertical direction; and a support portion that is rotatably supported by the support portion. a rotating shaft disposed in the vertical direction; a spline nut coaxially attached to the lower part of the rotating shaft; a spline shaft fitted to the spline nut so as to be movable along the axial direction; a first locking portion provided at the upper end and regulating the downward movement of the spline shaft through contact with the spline nut; a universal joint provided at the lower end of the spline shaft; and a first locking portion provided at the lower end of the spline shaft; a driver bit that is connected to the spline shaft and has an engaging portion at its lower end that fits into a groove formed in the head of the screw; a drive source that rotates the rotary shaft; and a lower end of the driver bit. a guide tube that is fitted onto the outer side of the screw so as to be movable along the axial direction and guides the head of the screw so that it matches the position of the driver bit; and a guide tube that is provided on the lower end side of the driver bit and that a second locking portion that restricts the tip of the guide tube at a position protruding from the tip of the engaging portion by contact with the second locking portion; and a first cylindrical locking portion that is slidably fitted onto the rotating shaft.
a slider; a first biasing means for biasing the first slider toward the driver bit; a locking/disengaging portion that transmits the biasing force of the first biasing means via the first slider to the guide cylinder; a second slider fitted into the upper end of the locking portion so as to be able to move toward and away from the locking portion; and a second urging means that urges the second slider to contact the first locking portion. a pin protruding from the outer circumferential surface of the second slider in a direction perpendicular to the axial direction of the rotating shaft; and a circumferential wall of the rotating shaft corresponding to the position of the pin and of the first slider. The tip portions of the pins provided on the peripheral wall are movably inserted in the axial direction of the rotating shaft to control the rotation of the rotating shaft.
an elongated hole that transmits the transmission to the slider; and a slot for moving the first slider upwardly against the urging force of the first urging means, and moving the first slider upwardly to cause the pin to move upwardly. By contacting the elongated hole, the second slider is moved upward against the biasing force of the second biasing means, thereby separating the first slider from the guide tube, and A screw adjusting device comprising: a moving mechanism for separating the second slider from a locking portion.