JP2002224969A - Screwdriver and method for screw driving using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screwdriver and a method for screw driving using it which can drive a screw and precisely adjust screw driving depth at the same time. SOLUTION: This invention is related to a screwdriver which has a cylindrical holder 1, a bit holder 2 for holding a bit 15 for driving an adjustment screw 16, a screw shaft 3 for revolving the bit 15, a screw gear 4 meshing the screw shaft 3, a cylindrical slider 5, a shaft 6 which is in the cylindrical slider 5 and connected the screw shaft 3 through a ball joint unit 7, and a nut 12 for regulating a slide of the cylindrical slider 5 connecting the edge of the cylindrical holder 1, and fixed the cylindrical slider 5 in the shaft 6 at a slide distance corresponding to a screwing depth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a screwdriver suitable for screwing a screw for adjusting a mounting angle of an optical pickup or the like and a screw screwing method using the screwdriver.

[0002]

2. Description of the Related Art Conventionally, an optical pickup used in an apparatus for recording or reproducing information on an optical disk or the like cannot accurately record or reproduce when a laser beam emitted therefrom has an incident angle with respect to the optical disk surface. . Therefore, it is necessary to adjust the relative position of the optical pickup with respect to the optical disk surface with high precision so that the incident angle of the laser beam emitted from the optical pickup with respect to the optical disk surface does not tilt. For this purpose, the relative position of the optical pickup with respect to the optical disk surface is adjusted by adjusting the amount of screwing of a screw such as an adjusting screw, that is, the amount of rotation of the screw.

The relative position of this optical pickup is generally determined by using a driver 103 as shown in FIG.
The adjustment is performed by adjusting the amount of rotation of the adjusting screw 104.

First, a screw hole 105 penetrating through a member 102 fixed and held in a predetermined positional relationship in advance.
Then, the adjusting screw 104 is inserted by the driver 103. Next, the screw 103 is screwed into the adjustment screw 104 by rotating it in the direction A by the driver 103 so as to have a predetermined rotation amount. Furthermore, when the rotation of the adjusting screw 104 is continued, the screw hole 105
The tip of the adjustment screw 104 is exposed from the other member 101.
That is, it comes into contact with the optical pickup. After the contact, if the amount of rotation is changed by further rotating the adjusting screw 104, the relative angle or the relative position B between the member 102 and the other member 101 changes, whereby the relative position of the member 101 to the member 102 is changed. The angle or the relative position is adjusted, and as a result, the incident angle of the laser beam of the optical pickup to be adjusted can be adjusted.

The adjustment of the amount of rotation of the adjusting screw is performed for highly accurate adjustment of the relative angle or the relative position. Generally, the adjustment of the amount of rotation of the adjusting screw includes the following process. (1) Inserting an adjusting screw: an operation of inserting an adjusting screw into a member into which the screw is to be screwed. (2) Coarse adjustment work: Turn the adjustment screw so that the rotation amount is approximately the expected amount. (3) Fine adjustment work: Turn the adjustment screw to the amount of rotation that optimizes the adjustment target.

Conventionally, various methods and apparatuses have been proposed for adjusting the incident angle of the optical pickup with high accuracy by adjusting the amount of rotation of the adjusting screw. For example, Japanese Patent Application Laid-Open No. H11-250464 describes a method and an apparatus for adjusting a mounting angle by rotating a bit that meshes with an adjusting screw of an optical pickup. In this publication, as a conventional technique, a method in which an operator manually turns a screwdriver to rotate an adjustment screw, and then an example in which rotation of the adjustment screw is automatically controlled by driving a motor or the like, There is a method in which a coarse adjustment knob and a fine adjustment knob are provided to perform a coarse adjustment operation and a fine adjustment operation.

[0007]

However, including the method described in the above publication, the operation of inserting the adjustment screw and the operation of coarse adjustment in the conventional adjustment of the rotation amount of the adjustment screw have the following problems. Was.

For example, in the case of a method in which the driver is turned by the hand of an operator, the operation of inserting the adjusting screw can be easily performed by the driver by hand, but in the coarse adjustment, only the visual adjustment is performed. There is a problem that it is difficult to determine the amount, the variation in the insertion height of the adjustment screw becomes large, and as a result, the work time for fine adjustment becomes long. In the case of the method of turning the driver by automatic control by motor drive, etc., the equipment for automatically controlling the adjustment screw insertion work and coarse adjustment is expensive and expensive, and the adjustment screw insertion work and the control of the rotation amount are expensive. , The total operation time is long and the production capacity tends to be small.

In view of the above, the present invention has been made to solve the above-mentioned problem, and it is possible to simultaneously perform the insertion of the screw and the adjustment of the screw-in amount, and furthermore, the driver capable of adjusting the screw-in amount with high accuracy and the use thereof. It is an object of the present invention to provide a method for screwing a screw.

[0010]

In order to solve the above-mentioned problems, a driver according to the present invention is a driver for manually screwing a screw into a member into which the screw is to be screwed. A bit holder for holding a bit into which the screw is screwed is disposed at one end of the cylindrical holder, and the screw shaft connected to the bit holder and having a helical thread groove for rotating the bit is formed in the cylindrical shape. A screw gear is mounted on the cylindrical holder for accommodating in the holder and rotating the screw shaft by meshing with a helical thread groove formed on the screw shaft. Is slidably accommodated with one end protruding from the cylindrical holder, and the cylindrical A shaft is inserted into the slider by protruding from both ends thereof, and the cylindrical slider is fixed to the shaft at a sliding distance commensurate with the amount of screwing, and abuts the shaft on the other end surface of the cylindrical holder. A ring-shaped stopper for restricting the slide of the cylindrical slider is fitted, and the shaft and the screw shaft are rotatably and coaxially connected to each other via a ball joint unit. A scale for measuring the sliding distance is provided, and a handle is rotatably attached to the other end of the shaft.

[0011] According to the above configuration, since the shaft that slides together with the cylindrical slider and the screw shaft that rotates while being connected to the shaft are provided, the pressing force applied to the shaft is converted into a rotational force. The screw can be inserted and screwed into the member to be screwed in simply by applying a pressing force to the shaft, and the sliding distance of the shaft is regulated by the ring-shaped stopper. The amount can be adjusted. In addition, since the screw shaft and the shaft are connected via the ball joint, the misalignment between the two can be easily absorbed. Further, since the ring-shaped stopper is provided and the scale is provided on the surface of the cylindrical slider, the sliding distance of the shaft can be easily set. Furthermore, since the handle is provided rotatably, the load on the fingers can be reduced.

Therefore, the relative angle or relative position of the other member with respect to the member into which the screw is to be screwed can be easily adjusted at the same time as the screw is inserted. Adjustment time can be significantly reduced.

According to a second aspect of the present invention, there is provided a method for screwing a screw into a member to be screwed manually using the screwdriver according to the first aspect of the present invention. The slide distance of the cylindrical holder is set between the end face of the nut and the end face of the nut, and the amount of rotation of the screw shaft is adjusted.

According to the above configuration, since the sliding distance of the cylindrical slider is set, the amount of rotation of the screw shaft can be accurately adjusted by the shaft that slides with the cylindrical slider.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A driver according to an embodiment of the present invention will be described below with reference to FIGS. 1 is a sectional view of a driver according to an embodiment of the present invention, FIG. 2 is a sectional view showing another state of the driver in FIG. 1, FIG. 3 is a perspective view of a ball joint unit in FIG. 1, and FIG. FIG. 10 is a flowchart illustrating an operation using a driver according to the embodiment.

In FIGS. 1 and 2, the driver according to the present embodiment includes a cylindrical holder 1 for gripping with a finger H, and a bit holder 2 for holding a bit 15 for screwing an adjusting screw 16. A screw shaft 3 having a helical screw groove for rotating the bit 15, and a screw gear 4 for rotating the screw shaft 3 by meshing with the helical screw groove formed on the screw shaft 3. A cylindrical slider 5 that slides in the cylindrical holder 1, a shaft 6 for manually transmitting power to the screw shaft 3 that is inserted into and slides with the cylindrical slider 5, and a cylindrical slider 5 is provided with a nut 12 for regulating the slide.

The bit holder 2 is disposed on one end side of the cylindrical holder 1 and is screwed into the bit holder 2.
5 is fixed to the bit holder 2. As the bit 15, a bit that meshes with an adjusting screw 16 to be screwed is used.

The screw shaft 3 is accommodated in the cylindrical holder 1 at a predetermined distance from the inner peripheral surface thereof, and one end of the screw shaft 3 projects from the cylindrical holder 1 and is inserted into the bit holder 2. The bit 15 is fixed to the bit holder 2 by screws.
It is connected to. A screw gear 4 is attached to one end of the cylindrical holder 1 by cutting a part of the cylindrical holder 1 by screw tightening. The screw shaft 3 is attached to the inner surface of the screw gear 4. Are formed to engage with and rotate the spiral screw groove formed in the screw thread. Here, the screw shaft 3 has a female screw as a spiral screw groove,
The screw gear 4 is formed with a male screw that meshes therewith.

Therefore, the screw shaft 3
The adjusting screw 16 is engaged with the bit 15 attached to the bit holder 2 by engagement with the screw gear 4.
And serves to change the linear motion (slide motion) transmitted from the shaft 6 into a rotary motion.

At the other end of the cylindrical holder 1, the cylindrical slider 5 is slidably accommodated, and one end thereof protrudes from the other end of the cylindrical holder 1.
The cylindrical slider 5 has an outer diameter such that a gap between the cylindrical slider 1 and the inner peripheral surface of the cylindrical slider 1 is a predetermined gap, for example, 0.3 mm to 0.5 mm. Rotational frictional resistance between the two is eliminated, so that smooth power transmission can be performed. The shaft 6 is inserted into the cylindrical slider 5 so that both ends of the shaft 6 protrude from the cylindrical slider 5.

The inner peripheral surface of the cylindrical slider 5 and the outer peripheral surface of the shaft 6 are tapped.
The cylindrical slider 5 is screwed onto the shaft 6 so as to be movable. A scale for measuring the sliding distance is engraved on the outer peripheral surface of the cylindrical slider 5.

The shaft 6 is provided with a nut 12 as a ring-shaped stopper, and the inner peripheral surface of the nut 12 is tapped. The nut 12 is movable on the shaft 6. I have. The cylindrical slider 5 is fixed to the shaft 6 with screws so as to have a sliding distance commensurate with the amount of screwing, and the nut 12 is fixed with screws to regulate the sliding of the cylindrical slider 5. Have been.

Further, a handle 13 is rotatably attached to the other end of the shaft 6 via a bearing 14. The bearing 14 is press-fitted into the handle 13, and the shaft 6 is inserted into the inner ring of the bearing 14. Is press-fitted at the other end.

Therefore, the shaft 6 is attached to the handle 1
3 acts as a power transmission shaft for transmitting a pushing force to the screw shaft 3 via the cylindrical slider 5.
Serves to guide the shaft 6, and the nut 12 abuts against the end face of the other end of the cylindrical holder 5 to serve as an adjustment stopper for adjusting the power transmission amount of the shaft 6. A lock nut that acts, and adjusts the amount of screwing, that is, the amount of rotation of the adjusting screw 16 by this.

The screw shaft 3 and the shaft 6 are rotatably connected via a ball joint unit 7 and a coupling 11 in the cylindrical holder 1 as shown in FIGS. I have. The ball joint unit 7 is fitted into the joint holder 8 so that the ball portion of the ball joint 9 moves freely and is prevented from falling off, and is formed into a universal joint. The ball joint 9 has its joint shaft 10 screwed into a coupling 11 and connected to the coupling 11, and the screw shaft 3 is connected to the coupling 11, while the shaft 6 is connected to the ball joint 9. ing. by this,
The screw shaft 3 and the shaft 6 are connected together with the bit 15 and the bit holder 2 and are arranged coaxially. The screw shaft 3 and the shaft 6 constitute a drive shaft in which the two integrally slide and rotate.

Here, in order to smoothly transmit the force pushed by the shaft 6 to the bit 15, the accuracy of the coaxiality at the time of machining a part is affected. Since the ball portion is fitted so as to move freely, the ball portion of the ball joint 9 acts as a joint, and the shaft 6 and the screw shaft 3 exhibit an axial alignment action.

Incidentally, as shown in FIG. 3, the ball joint 9 rotates in the direction e and the X and Y directions indicated by d in a plane orthogonal to the axial direction and the direction at an arbitrary angle θ with respect to the direction. Also rotate freely.

In the above configuration, the nut 12 is fixed to a predetermined position of the shaft 6 so as to obtain a desired screwing amount while watching the scale, and the cylindrical slider 5 is fixed.
Is fixed, and the sliding distance of the cylindrical slider 5 is set. When the handle 13 is pushed in the direction b by a finger, the pushing force is transmitted to the shaft 6, and the shaft 6 slides together with the cylindrical slider 5, and the ball joint 9. The force transmitted to the screw shaft 3 via the coupling 11 is converted into a rotational force, and the adjusting screw 16 is rotated in the direction a via the bit 15 and screwed into the member 21. When the adjusting screw 16 is inserted and screwed at the same time to a predetermined screwing amount, the nut 12 comes into contact with the end surface of the cylindrical holder 1 as shown in FIG. The relative angle or relative position of the other member 23 with respect to 21 is roughly adjusted. The rotation speed of the screw at this time is, for example, 10
A high-speed rotation equivalent to 00 rpm / min is obtained.

In the above operation, when the handle 13 is pressed with a finger, the pushing force (linear motion) is transmitted to the shaft 6, but this pushing force is transmitted to the screw shaft 3 via the shaft 6, and the screw shaft 3 When the bearing 14 is provided in the handle portion 13, the load on the finger is removed, and only the pushing force is smoothly applied to the screw shaft 3. Can be transmitted.

Further, as described above, the nut 12 fixed on the shaft 6 determines the screwing amount, that is, the rotation amount of the adjusting screw 16 to be screwed in according to the distance from the pushing-side end face of the cylindrical holder 1. The shaft 6
The amount of rotation of the adjusting screw 16 can be adjusted by changing the fixing positions of the upper nut 12 and the cylindrical slider 5.

Further, by setting a scale on the outer peripheral surface of the slider 5, it is possible to easily adjust and set the amount of rotation of the adjusting screw 16. Further, the screw shaft 3 for obtaining the rotational movement necessary for screwing the adjusting screw 16 is formed with a helical screw groove, and a rotation feed mechanism is formed by combination with the screw gear 4 meshing with the screw groove. Thus, the sliding motion to be pushed by the finger transmitted to the shaft 6 can be changed to the rotating motion.

Further, since the screw shaft 3 and the shaft 6 are connected by fitting the ball joint 9 to the joint holder 8 as described above, the misalignment between the pushing side and the pushed side can be absorbed, and the screw can be absorbed. Shaft 3
Is given a smooth rotational movement. Coupling 11
When a joint is formed only from the above, in order to apply a small amount of force to the handle portion 13 and perform a series of operations, it is necessary to transmit the pushing force straight to the bit 15, but the coaxial is also used in the processing of each part. There is a limit to the accuracy that can be obtained, and it is even more difficult to obtain the coaxiality of each component after assembly. When the coaxiality cannot be obtained, a load action is generated on the shaft 6, and a smooth rotational motion cannot be obtained, and the force applied to the handle 13 increases,
The burden on the worker also increases.

Further, the joint holder 8 and the ball joint 9 begin to act as a pair, and act as a pair.
When a rotational force in the screwing direction generated at the time of screwing of the nut is generated in the nut 12 and comes into contact with the cylindrical holder 1, a biting force is generated.
Is connected to the shaft 6 by screwing, frees the joint holder 8 and the ball joint 9 and slides the rotation screwing action on the spherical surface of the ball joint 9 to prevent the cylindrical holder 1 and the nut 12 from biting, The rotation slide operation in which the shaft 6 and the screw shaft 3 rotate in the reverse direction to return to the screwing start position can be smoothly performed.

In the driver, the cylindrical holder 1
Is used as a grip (grip portion) when gripping the finger and screwing the adjusting screw 16, and it is preferable that the surface of the finger is subjected to a knurling process in order to eliminate slippage of the finger and facilitate holding. The material is preferably made of resin in order to reduce the weight as much as possible so as not to burden the fingers.

It is desirable that the helical thread groove formed on the screw shaft 3 be formed at an angle of about 10 ° with respect to the axial direction. This is because if the angle is too small, the screw thread formed on the screw shaft 3 needs to be rotated one turn in order to screw it in one turn when screwing the adjusting screw 16. A long stroke (distance) is required. In order to obtain the required screwing amount within a range that can be pushed by a finger, if the angle is too large, the screwing of the adjusting screw 16 causes the screw shaft 3 and the screw gear 4 to be pushed together. There is a possibility that a load is applied to the force and the weight becomes heavy.

Further, in order to obtain a smooth rotation by the screw shaft 3 and the screw gear 4, it is preferable to apply grease as a lubricant to the contact surface of the meshing portion. By using grease, a smooth movement with low torque can be obtained. In particular, lithium-based grease is excellent in friction resistance and extreme pressure performance as its characteristics, so that it hardly softens even when used for a long time, and can secure mechanical safety.

When the same grease as described above is applied to the fitting portion (spherical portion) between the joint holder 8 and the ball joint 9, smooth rotation can be performed.

When the load action of the shaft 6 and the screw shaft 3 is reduced more than necessary, the cylindrical holder 1 and the nut 1 are urged by their own weight before the pressing force is applied to the handle 13.
However, it is impossible to maintain a constant stroke secured between the cylindrical holder 1 and the screw shaft 3 inside the cylindrical holder 1, and a spring is inserted into a gap between the coupling 11 and the cylindrical shaft to always maintain the cylindrical shape. Shaft 6 and screw shaft 3 housed inside holder 1
The function of pushing up the button works, and it is possible to prevent the button from being lowered by its own weight. However, putting a spring exerts a force opposite to the direction of the force pushing the finger from the b side, so the load on the finger may be somewhat heavy.
It is good to select a spring according to a use situation.

Further, when the adjusting screw 16 is mounted on the tip of the bit 15, for example, if a screw storage box in which a plurality of adjusting screws 16 are arranged and used is used, the bit 15 is simply pressed against the aligned adjusting screw 16. Since the adjusting screw 16 can be attached to the bit 15, a force for pressing the adjusting screw 16 acts. After the adjusting screw 16 is attached to the tip of the bit 15, the bit 15 is pushed back against the pressing force. At this time, the end face of the cylindrical holder 1 serves as a stopper for the bit holder 2, and the interval between the cylindrical holder 1 and the nut 12 as shown in FIG. 1 returns to the state (fixed position) before the adjustment screw 16 is inserted. , Adjusting screw 16
It is possible to perform only the operation of repeating the operation of only inserting and mounting the device.

A series of operations for inserting and screwing the adjusting screw will be described with reference to a flowchart shown in FIG. First, at the start of work, step 1 (S1)
Sets the sliding distance of the shaft 6.

In step 2 (S2), the cylindrical holder 1
Hand in hand. The tip of the bit 15 is applied to the adjusting screw 16 aligned in step 3 (S3).

In step 4 (S4), the cylindrical holder 1 is pressed from just above the screw hole of the adjusting screw 16. In step 5 (S5), as shown in FIG.
When the adjustment screw 16 is mounted on the shaft 6, the shaft 6 and the screw shaft 3 (hereinafter, these are referred to as shaft shafts) rotate and rise by the pushing back force at that time.

In step 6 (S6), the shaft stops at the fixed position. In step 7 (S7), as shown in FIG. 1, the tip of the adjusting screw 16 is applied to a screw hole 22 formed in the member 21 into which the screw is to be screwed.

In step 8 (S8), the finger 13 presses the handle 13 of the shaft that has been raised. In step 9 (S9), the shaft is lowered. In step 10 (S10), the adjusting screw 16 at the tip of the bit 15 is screwed into the member 21 while the shaft is lowered.

In step 11 (S11), the shaft stops at the fixed position, and the state shown in FIG. 2 is reached, and the relative position or relative angle of the member 23 with respect to the member 21 is adjusted. In the above description, steps 3 to 10 are the operation of inserting the adjusting screw, and steps 7 to 11 are the coarse adjustment operation.

According to the driver, the operation of inserting the adjusting screw and the operation of coarse adjustment can be performed simultaneously as described above. Then, after the coarse adjustment operation, fine adjustment is performed by an electric automatic machine.

According to the driver of the present invention, the amount of rotation can be adjusted simultaneously with the insertion of the adjusting screw, and the required amount of insertion can be obtained only by the operator operating a fixed amount with a finger in a mechanical pencil. In addition, with the above configuration, it is possible to easily adjust the amount of rotation (coarse adjustment) when inserting and screwing in screws with a small mechanical tool without using electrical and control elements, and keep the screwing amount constant. can do.

[0048]

According to the driver of the present invention, since the shaft which slides together with the cylindrical slider and the screw shaft which rotates while being connected to the shaft are provided, the pressing force applied to the shaft is converted into a rotational force. To be
The screw can be inserted and screwed into the member to be screwed in simply by applying a pressing force to the shaft, and the sliding distance of the shaft is regulated by the ring-shaped stopper. The screwing amount can be easily adjusted.
Therefore, the relative angle or relative position of the other member with respect to the member to which the screw is to be screwed can be adjusted simultaneously with the insertion of the screw, and thus the adjustment time for coarse adjustment and further fine adjustment by the screw can be reduced. can do.

According to the screwing method of the present invention, the sliding distance of the cylindrical slider is set.
The amount of rotation of the screw shaft is accurately adjusted by the shaft that slides with the cylindrical slider.

[Brief description of the drawings]

FIG. 1 is a sectional view of a driver according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing another state of the driver in FIG.

FIG. 3 is a perspective view of the ball joint unit in FIG. 1;

FIG. 4 is a flowchart illustrating an operation using a driver according to the embodiment of the present invention.

FIG. 5 is an external configuration diagram showing a method of screwing a screw in a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical holder 2 Bit holder 3 Screw shaft 4 Screw gear 5 Cylindrical slider 6 Shaft 7 Ball joint unit 8 Joint holder 9 Ball joint 10 Joint shaft 11 Coupling 12 Nut 13 Handle part 14 Bearing 15 Bit 16 Adjusting screw 21 Member 22 Screw hole 23 Other member a Screw rotation direction b Push direction d X, Y, θ direction e Rotation direction H Finger 101 Other member 102 Member 103 Driver 104 Adjustment screw 105 Screw hole A Screw rotation direction B Relative angle or relative position

Claims (2)

[Claims] 1. A screwdriver for manually screwing a screw into a member into which a screw is to be screwed, comprising: a bit holder for holding a bit into which the screw is screwed at one end of a cylindrical holder for gripping with a finger. A screw shaft connected to the bit holder and having a helical screw groove for rotating the bit is accommodated in the cylindrical holder, and a helical screw groove formed on the screw shaft is provided. A screw gear for meshing and rotating the screw shaft is attached to the cylindrical holder, and a cylindrical slider is slidably mounted on the other end side of the cylindrical holder and one end is projected from the cylindrical holder and accommodated. Inserting the shaft into the cylindrical slider by protruding from both ends thereof, A ring-shaped stopper for fixing the cylindrical slider to a shaft at a sliding distance commensurate with the amount of screwing, and abutting the shaft on the other end surface of the cylindrical holder to restrict the sliding of the cylindrical slider. The shaft and the screw shaft are rotatably and coaxially connected to each other via a ball joint unit, and a scale is provided on a surface of the cylindrical slider for measuring a sliding distance thereof, and A driver having a handle rotatably attached to the other end of a shaft. 2. When manually screwing a screw into a member to be screwed using the driver according to claim 1,
The sliding distance of the cylindrical holder is set from the end face of the cylindrical holder to the end face of the ring-shaped stopper by a scale provided on the cylindrical slider, and the amount of rotation of the screw shaft is adjusted. How to screw in the screw.