JP2852600B2 - Manufacturing equipment for locking screws - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a locking screw for applying a lock paint to a screw portion of a screw to prevent the screw from being loosened by the lock paint.

[0002]

2. Description of the Related Art Screws with lock paint applied to the screw part are:
Lock paint prevents loosening. This is because the lock paint enters the gap between the screw portion and the nut in a state where the screw is tightened, and this becomes a resistance when loosened. Screws to which lock paint is not applied also have the property that they are unlikely to loosen when tightened strongly. This is because, in a strongly tightened state, the thread of the screw portion and the thread of the nut are strongly pressed against each other, and the frictional resistance increases. However,
If the screw is loosened for any reason, the pressing force of the screw portion and the thread of the nut suddenly weakens, and the frictional resistance between the screw and the nut becomes small and the screw and the nut are easily loosened.

[0003] To prevent this drawback, a spring washer is used. However, the spring washer can prevent the screw from being loosened only in a range where the screw head can be elastically pressed by being crushed.
If the screw is loosened and the spring washer cannot press the screw head, the loosening cannot be prevented. For this reason, it is difficult for the spring washer to effectively prevent the screw from being loosened. In particular, screws that are frequently used in automobiles and the like, which are frequently vibrated, are easily loosened by vibrations, and screws that can effectively prevent loosening are highly desired.

[0004] In order to realize this, a screw in which lock paint is applied to the screw portion has been developed. This screw is
Since the lock paint is applied to the threads, the tightening torque is slightly increased, but it is possible to effectively prevent loosening in the tightened state. In particular, since the lock paint prevents the lock paint from entering the gap between the screw portion and the nut and being loosened, the lock paint has an excellent locking effect as compared with the spring washer. Further, since the lock paint does not completely adhere the thread of the screw to the nut, it can be loosened if necessary. When a water-soluble lock paint is used, the lock paint can be easily dissolved by dissolving it with water.

It is necessary to apply a lock paint to a screw portion of the screw having this structure before the screw is tightened and to harden the screw. As a device for applying a lock paint to a screw, a device for inserting a tip of a screw portion into the lock paint and applying a lock paint to the tip has been developed. In this apparatus, the screw is lowered while the screw is being transferred, the tip is immersed in the lock paint, and the screw on which the lock paint is applied is heated to dry the lock paint.

[0006]

An apparatus for applying the lock paint by dipping the tip of the screw in the lock paint has a feature that the lock paint can be efficiently applied to the tip of the screw portion. However, the screws manufactured by this device have a drawback that they cannot be easily screwed into the screw holes because the lock paint is applied to the tips. It is, as noted in Figure 1,
This is because the tip of the screw portion 1A is made thicker than the screw hole 3 by the lock paint 2. The screw 1 whose tip is thicker than the screw hole 3 needs to be accurately positioned at the center of the screw hole 3 and tightened into the screw hole 3 while rotating with relatively strong torque.

[0007] The present invention has been developed for the purpose of further solving this drawback. An important object of the present invention is that it can be easily and easily screwed into a screw hole,
An object of the present invention is to provide an apparatus for manufacturing a locking screw which can efficiently produce a large number of screws capable of effectively preventing loosening in a screwed state.

[0008]

An apparatus for manufacturing a locking screw according to the present invention has the following arrangement to achieve the above object. The device for manufacturing a locking screw is provided with a transfer means 4 for transferring the screw 1 and a sprayer disposed at a position for spraying the lock paint 2 toward the surface of the screw portion 1A of the screw 1 transferred by the transfer means 4. Detecting that the screw 1 has been transferred to the front of the nozzle 5 and the injection nozzle 5,
Paint supply means 6 for supplying a predetermined amount of lock paint 2 to
A rotation means 9 for rotating the screw 1 coated with the lock paint 2 and a transfer path for the screw 1 which is transferred while being rotated by the rotation means 9 are disposed in contact with the lock paint 2 applied to the surface. A leveling guide 7 for leveling in the circumferential direction is provided.

The transfer means 4 transfers the screw 1, and the spray nozzle 5 sprays and applies the lock paint 2 to the screw portion 1A of the screw 1 transferred forward. The screw 1 in which the lock paint 2 is applied to the surface of the screw portion 1A is rotated by the rotating means 9. The lock paint 2 applied to the surface of the screw which is transported while being rotated is brought into contact with a leveling guide 7 provided in the transport path of the screw, and is leveled around the entire circumference of the screw 1.

[0010]

The device for manufacturing a locking screw according to the present invention performs the following operation to uniformly lock the coating material 2 on the screw portion 1A of the screw 1.
Is applied. The transfer means 4 transfers the screw 1. When the screw 1 is moved forward of the spray nozzle 5, the paint supply means 6 supplies the lock paint 2 to the spray nozzle 5,
The lock paint 2 is sprayed and applied to the surface of the screw portion 1A. The screw 1 in which the lock paint 2 is applied to the surface of the screw portion 1A is rotated by the rotating means 9 and is leveled in the circumferential direction by the leveling guide 7, and is applied to the entire circumference. In this way, the injection nozzle 5 locks the lock paint 2
In the apparatus for spraying and applying the coating material, and using a leveling guide 7 to evenly apply the lock coating material 2, the injection paint nozzle 5 can accurately apply the lock paint 2 to a required portion. Therefore, it is possible to apply the lock paint 2 to a portion excluding a few threads from the tip except for the tip of the screw portion 1A. Further, since the lock paint 2 is applied to the entire circumference of the screw portion 1A by the leveling guide 7, it is possible to effectively prevent loosening in a tightened state.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify a device for manufacturing a locking screw for embodying the technical idea of the present invention. Not specific to

Further, in this specification, in order to facilitate understanding of the claims, the numbers corresponding to the members shown in the embodiments will be referred to as "claims", "actions", and "actions". In the column of "Means for solving the problem". However, the members shown in the claims are
It is by no means specific to the members of the embodiment.

The device for manufacturing a locking screw shown in FIG. 2 comprises a transfer means 4 for transferring the screw 1 while rotating it, and a lock paint 2 sprayed and applied to the screw portion 1A of the screw 1 transferred by the transfer means 4. An injection nozzle 5 for supplying the lock paint 2 to the injection nozzle 5 and a leveling guide 7 for uniformly leveling the applied lock paint 2 are provided.

The transfer means 4 includes a disk 8 for guiding and transferring the screw to the V groove on the outer periphery, and a rotating means 9 disposed above the disk 8 for rotating the screw. The disk 8 is provided with V-grooves 8A for guiding screws at regular intervals on the outer periphery. V
The groove 8A has a width and a depth capable of supplying one screw 1. The disk 8 is mounted on a base such that a central rotating shaft (not shown) can be rotated in a horizontal plane via a bearing (not shown). Disk 8 is a motor (not shown)
And is rotated at a constant speed by a motor.

The V-groove 8A of the disk 8 is supplied with a screw from a supply guide 10 as shown in FIGS. The supply guide 10 makes the tip approach the outer periphery of the disk 8 and
It is disposed on a downward slope toward. The V groove 8A has an outer periphery open. Therefore, the screw 1 supplied here
Is required not to fall from the V groove 8A. V groove 8A
In order to prevent the screw from dropping from the outside, an outer peripheral guide 11 is provided along the outer periphery of the disk 8. Outer circumference guide 1
1 is arranged so as not to be in contact with the outer periphery of the disk 8 but close to it. The outer peripheral guide 11 is not provided on the entire circumference of the disk 8. In a portion where the outer peripheral guide 11 is not provided, the screw is prevented from dropping from the V groove 8A by the rotating member of the rotating means 9.

A rotating means 9 for rotating the screw 1 in the V groove 8A of the disk 8 is disposed above the disk 8 and rotates with the disk 8, and a V groove 8A is formed in the rotating disk 12. , A cam 15 for moving the rotating member 13 up and down, and a rotating member 1.
And driving means 14 for rotating the screw 3 to rotate the screw.

The rotary disk 12 is fixed horizontally with respect to the central axis of the disk 8 and is disposed horizontally apart from the disk 8 as shown in FIG. V-grooves 8
A rotary hole 12A through which the rotary member 13 is inserted is provided directly above the screw A, that is, right above the screw 1 guided by the V groove 8A. The rotating hole 12A has a cylindrical shape, and the rotating member 1
3 is inserted so as to be rotatable, and the rotating member 13 is inserted so as to be able to move up and down.

The rotating member 1 inserted in the rotating hole 12A
3 rotates the screw 1 guided by the V groove 8A of the disk 8. Further, the rotating member 13 also prevents the screw 1 from dropping from the V groove 8A. The rotating member 13 has a screw head 1 at the lower end.
In order to rotate the screw 1 by fitting into the + -shaped groove of B, a driver protrusion 13A that can be fitted into the + -shaped groove of the screw head 1B is provided. Further, the rotating member 13 has a pulley 1
3B. The pulley 13B is hung on the belt 16 to rotate the rotating member 13. Furthermore, pulley 13
B slides on the upper surface of the cam 15 to lower and raise the rotating member 13 to a predetermined position, as shown in FIGS. The rotating member 13 is designed to have a total length in which the driver protrusion 13A at the lower end is fitted into the + -shaped groove of the screw head 1B when descending. Driver protrusion 13A of rotating member 13
Is inserted into the screw head 1B, by the rotating member 13,
The screw is held in the V groove 8A. This is because the rotating member 13 is located directly above the screw 1 and is moved together with the screw 1, and the screw head 1B is hooked on the V groove 8A.

As shown in FIGS. 5 and 6, the cam 15 slides the pulley 13B of the rotating member 13 to the upper surface to lower the rotating member 13. As shown in FIG. 6, the cam 15 is located on the outer periphery of the turntable 12 and is fixed so as not to rotate. The cam 15 lowers the rotating member 13 at a position where the driver protrusion 13A of the rotating member 13 is fitted into the screw head 1B, as shown in FIG. Rotating member 1 dropped
3 is a screw 1 supplied from the supply guide 10 to the V groove 8A.
Is transported while rotating so that the lock paint 2 is applied. After applying the lock paint 2, the rotating member 13 is raised by the cam 15, and the screw 1 is discharged from the V groove 8A. The cam 15 is disposed on the outer periphery of the turntable 12 at a position other than a position from a position where the screw 1 is supplied to the V groove 8A to a position where the lock paint 2 is applied and discharged.

The rotating member 13 that is not lifted by the cam 15, in other words, the rotating member 13 that is in the lowered position is rotated by the driving means 14. As shown in FIG. 6, the driving means 14 includes a belt 16 stretched above the turntable 12 and an idle pulley 1 for arranging the belt 16 at a predetermined position.
8 and a drive pulley 17 for driving the belt 16. The drive pulley 17 is connected to a motor (not shown). The motor rotates the driving pulley 17, and the driving pulley 17 drives the belt 16. The belt 16
It is disposed at a position where the pulley 13B of the lowered rotating member 13 is hung. The rotating member 13 that has descended is hung on the belt 16 of the pulley 13B and rotated.

The above-mentioned transfer means 4 is as follows:
Transfer while rotating the screw. The supply guide 10 has a V-shaped groove 8A of the rotating disk 8.
Is supplied with the screw 1. The rotating member 13 located above the V groove 8A to which the screw 1 is supplied is raised by the cam 15. The screw 1 supplied to the V groove 8A is prevented from moving outside from the V groove 8A by the outer peripheral guide 11. When the disk 8 is rotated, the rotating member 13 located directly above the screw 1 descends, and the driver protrusion 13A of the rotating member 13 is fitted into the + -shaped groove of the screw head 1B. The rotating member 13 that has descended is rotated by the pulley 13B hung on the belt 16 of the driving means 14. The screw protrusion 1A of the driver member 13A of the rotating member 13 is the screw head 1B
Is transported while being rotated by the rotating member 13. In this state, the screw 1 becomes the rotating member 13
This prevents the V groove 8A from going outside. Therefore, it is not necessary to prevent the screw 1 from coming out of the V groove 8A by the outer peripheral guide 11. Therefore, at a position where the driver protrusion 13A of the rotating member 13 is fitted into the screw head 1B, the outer peripheral guide 11 is omitted. The screw 1 transported by the rotating member 13 while being rotated in the V-groove 8A is coated with the lock paint 2 on the screw portion 1A by a mechanism described later. Screw 1 in which lock paint 2 is applied to screw portion 1A is
The rotating member 13 is lifted by the cam 15 and taken out of the V groove 8A to dry and harden the lock paint 2.

The screw 1 which is transported while rotating in the V-groove 8 A of the disk 8 is coated with the lock paint 2 by the injection nozzle 5. The injection nozzle 5 is, as shown in FIGS. 2 and 7,
The lock paint 2 is disposed at a position where the lock paint 2 is sprayed toward the surface of the screw portion 1A of the screw 1 transferred by the transfer means 4.
That is, the injection nozzle 5 is disposed such that its tip is close to the surface of the screw portion 1A. The injection nozzle 5 injects the lock paint 2 only when the lock paint 2 is supplied from the paint supply means 6 and the screw 1 is transferred forward.

The paint supply means 6 includes a sensor 19 for detecting that the screw 1 is transferred to the front of the injection nozzle 5, a timer (not shown) for starting counting by the output of the sensor 19, and a timer for counting up. A control valve 20 that is temporarily opened when the control valve 20 is opened, and a pressurized tank 21 that supplies the lock paint 2 by pressurizing the control valve 20 is provided. The set time of the timer is set to the time during which the screw 1 passing through the sensor 19 moves forward of the injection nozzle 5. The control valve 20 is opened for a short time when the screw 1 passes in front of the injection nozzle 5, and supplies a predetermined amount of the lock paint 2 to the injection nozzle 5.

The paint supply means 6 having this structure performs the following operation, and the injection nozzle 5 injects the lock paint 2 to the screw 1. The screw 1 transported while being rotated by the V-groove 8A of the disk 8 passes in front of the sensor 19 and is detected by the sensor 19. When the timer starts counting and the time for the screw 1 to pass in front of the injection nozzle 5 is reached, the timer times out. This is because the setting time of the timer is set to the time that the screw 1 passes in front of the sensor 19 and moves in front of the injection nozzle 5 based on the rotation speed of the disk 8. When the timer expires, the control valve 20 is temporarily opened. When the control valve 20 is opened, the lock paint 2 in the pressurized tank 21 is injected from the injection nozzle 5 through the control valve 20. After a certain amount of lock paint 2 has been injected, the control valve 20 is closed.

Thereafter, this operation is repeated to apply the lock paint 2 to the screw 1. As described above, the apparatus for spraying and applying the lock paint 2 while rotating the screw 1 of the V-groove 8A can apply the lock paint 2 to the rotating screw 1 in a wide area, and securely apply the lock paint 2 to the screw 1. There is a feature that can be attached to.

The leveling guide 7 is for leveling the lock paint 2 applied to the screw portion 1A in the circumferential direction, and is disposed close to the outer periphery of the disk 8 as shown in FIG. The screw 1 to which the lock paint 2 has been applied is transported while being rotated by the rotating member 13 in the V groove 8A. The lock paint 2 applied to the surface of the screw portion 1A is leveled in the circumferential direction and adjusted to a uniform film thickness by the rotating screw 1 coming into contact with the surface of the leveling guide 7. The leveling guide 7 includes a spring 22
Thus, the screw 1 is elastically pressed in the direction of the disk 8 and presses the surface of the screw 1 to level the applied lock paint 2 in the circumferential direction.

The screw 1 in which the lock paint 2 has been leveled by the leveling guide 7 is lifted by the rotating member 13 and discharged from the V-groove 8A to dry the lock paint 2.

[0028]

According to the present invention, the locking device is manufactured by spraying a lock paint onto the screw portion of the screw transferred by the transfer means with a spray nozzle, and applying the lock paint in a circumferential direction by a leveling guide. It is configured so as to equalize. The apparatus for applying the lock paint in this state can apply an accurate amount of the lock paint to a predetermined position of the screw portion. In particular, the device for manufacturing a locking screw according to the present invention can apply a lock paint to a portion other than the tip of the screw portion. Screws that do not have lock paint applied to their tips can be easily screwed into the screw holes, just like screws that do not apply lock paint. The lock paint applied to the screw portion enters a state between the screw portion and the screw hole while the screw is being screwed into the screw hole to a predetermined depth. When the lock paint enters between the screw portion and the screw hole, the rotational torque for tightening the screw is slightly increased. However, in this state, since the tip of the screw portion is already screwed into the screw hole, the screw is accurately screwed into the screw hole by rotating the screw. Therefore, the device of the present invention has a feature that, like the screw which does not apply the lock paint, the screw which can be easily and easily prevented from being loosened by being screwed can be efficiently mass-produced.

Further, in the apparatus for manufacturing a locking screw according to the present invention, the screw having the lock paint applied to the screw portion by the spray nozzle is rotated by the rotating means, and the screw is uniformly applied in the circumferential direction by the leveling guide. Therefore, it is possible to manufacture a screw in which the lock paint is uniformly applied around the screw. Therefore, a screw manufactured by this device has a feature that it can be effectively prevented from being loosened.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a screw having a lock paint applied to a screw portion is screwed in a conventional device.

FIG. 2 is a plan view showing a main part of a device for manufacturing a locking screw according to an embodiment of the present invention.

FIG. 3 is a plan view of a portion for supplying a screw to a disk of the transfer means.

FIG. 4 is a vertical sectional view of a portion for supplying a screw to a disk of a transfer means.

FIG. 5 is a front view of a portion where a rotating member descends along a cam.

FIG. 6 is a plan view showing a driving unit for rotating a rotating member.

FIG. 7 is a vertical sectional view showing a part where a lock paint is sprayed onto a screw to be applied;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Screw 1A ... Screw part 1B ... Screw head 2 ... Lock paint 3 ... Screw hole 4 ... Transfer means 5 ... Injection nozzle 6 ... Paint supply means 7 ... Leveling guide 8 ... Disk 8A ... V groove 9 ... Rotating means 10 ... Supply guide 11: Outer peripheral guide 12: Rotating disc 12A: Rotating hole 13: Rotating member 13A: Driver protrusion
13B pulley 14 driving means 15 cam 16 belt 17 drive pulley 18 idle pulley 19 sensor 20 control valve 21 pressurized tank 22 spring

Claims (1)

(57) [Claims] A lock paint (2) is sprayed toward a surface of a screw (1A) of a screw (1) transferred by a transfer means (4) for transferring the screw (1) and a screw (1) transferred by the transfer means (4). The injection nozzle (5) disposed at the position where the screw (1) is transferred in front of the injection nozzle (5) is detected, and a predetermined amount of lock paint ( A paint supply means (6) for supplying 2) and a rotation means (9) for rotating a screw (1) coated with lock paint (2)
And the screw transferred while being rotated by the rotating means (9)
A leveling guide (7) is provided on the transfer path of (1), and comes into contact with the lock paint (2) applied on the surface to level in the circumferential direction,
The transfer means (4) transfers the screw (1), and the spray nozzle (5) locks on the screw portion (1A) of the screw (1) that has been transferred forward (2).
And apply a lock paint on the surface of the screw (1A).
A device for manufacturing a locking screw in which the screw (1) coated with (2) is rotated by the rotating means (9) to level the lock paint (2) and the entire circumference with the guide (7). .