JPH07208429A - Locking screw manufacturing device - Google Patents

Abstract

PURPOSE:To realize mass production efficiently of a locking screw capable of effectively preventing a screw from becoming loose in a screwed-in condition. CONSTITUTION:A locking screw manufacturing device is equipped with a screw 1 moving means 4, an injection nozzle 5 for injecting lock paint towards a screw portion 1A of the screw 1, a paint supply means 6 for supplying specified quantity of lock paint 2 to the injection nozzle 5, and a leveling means 7 for leveling the lock paint 2 on the screw surface in the circumferential direction. Thus, because the injection nozzle 5 sprays the lock paint 2 on the screw portion 1A of the conveyed screw 1 and levels the lock paint 2 with the leveling means 7, screws applied with lock paint 2 exactly on the required portion of the screw portion 1A can be mass produced inexpensively and efficiently.

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 lock paint to a thread portion of a screw to prevent the screw from loosening due to the lock paint.

[0002]

2. Description of the Related Art Screws with lock paint applied to the screw part
Lock paint prevents loosening. This is because the lock paint penetrates into the gap between the screw part and the nut in a state where the screw is tightened, and becomes a resistance when the lock paint is loosened. Even screws without lock paint have the property that they are difficult to loosen when tightened tightly. This is because, in a strongly tightened state, the thread portion and the thread of the nut are strongly pressed against each other to increase the frictional resistance. However,
If the screw is loosened even for some reason, the pressing force between the screw thread of the screw portion and the nut is suddenly weakened, the frictional resistance between the screw and the nut is reduced, and the screw is easily loosened.

To prevent this drawback, spring washers are used. However, the spring washer can prevent the screw from loosening only in the range in which the screw head can be elastically pressed by being crushed.
If the screw becomes loose and the spring washer cannot press the screw head, it cannot be prevented from loosening. Therefore, it is difficult for the spring washer to effectively prevent the loosening of the screw. In particular, screws used in automobiles and the like that are subject to a lot of vibration are easily loosened by vibration, and there is a strong demand for screws that can effectively prevent the screws from loosening.

In order to realize this, a screw having a lock coating applied to the screw portion has been developed. This screw is
Since the lock paint is applied to the threads, the tightening torque is somewhat increased, but it can be effectively prevented from loosening in the tightened state. In particular, the lock paint is prevented from entering the gap between the screw portion and the nut and loosening, so that it has an excellent anti-loosening effect as compared with the spring washer. Further, the lock paint does not completely adhere the threaded portion of the screw to the nut, so it can be loosened if necessary. If you use water soluble rock paint, you can easily loosen it by dissolving the rock paint with water.

Before tightening, the screw of this structure needs to be coated with a lock paint to be hardened. As a device for applying lock paint to a screw, a device has been developed which inserts the tip of the screw portion into the lock paint and applies the lock paint to the tip. This device lowers the screw while the screw is being transferred, immerses the tip in the lock paint, and heats the screw coated with the lock paint to dry the lock paint.

[0006]

The device for applying the lock paint by immersing 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 part. However, the screw manufactured by this device has a drawback that it cannot be easily screwed into the screw hole because the lock paint is applied to the tip of the screw. As shown in Fig. 1,
This is because the tip of the screw portion 1A is thicker than the screw hole 3 by the lock paint 2. The screw 1 whose tip is thicker than the screw hole 3 must be accurately positioned in the center of the screw hole 3 and tightened into the screw hole 3 while rotating with a relatively strong torque.

The present invention was developed for the purpose of 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 a locking screw manufacturing apparatus capable of efficiently producing a large number of screws capable of effectively preventing loosening in a screwed state.

[0008]

In order to achieve the above-mentioned object, an apparatus for manufacturing a locking screw according to the present invention has the following construction. The loosening screw manufacturing apparatus has a transfer means 4 for transferring the screw 1, and a spraying device arranged 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. The nozzle 5 and the screw 1 transferred to the front of the jet nozzle 5 are detected to detect the jet nozzle 5
Paint supply means 6 for supplying a predetermined amount of lock paint 2 to
A leveling means 7 for leveling the lock paint 2 applied to the surface of the screw portion 1A in the circumferential direction is provided.

The transfer means 4 transfers the screw 1, and the spray nozzle 5 sprays the lock paint 2 onto the screw portion 1A of the screw 1 which has been transferred forward to apply the lock paint 2. The lock paint 2 applied to the screws is leveled by the leveling means 7.

[0010]

The apparatus for manufacturing the locking screw of the present invention performs the following operation to evenly apply the lock paint 2 to the screw portion 1A of the screw 1.
Apply. The transfer means 4 transfers the screw 1. When the screw 1 is transferred to the front 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 on the surface of the screw portion 1A. The lock paint 2 applied to the surface of the screw portion 1A is evenly leveled in the circumferential direction by the leveling means 7. In this way, the injection nozzle 5 locks the thread 2A with the lock paint 2
In a device for spraying and applying and then leveling it uniformly by a leveling means 7, the spray nozzle 5 can accurately apply the lock paint 2 to a required portion. Therefore, the lock paint 2 can be applied to the portion excluding the several threads from the tip excluding the tip of the threaded portion 1A. Further, since the lock paint 2 is applied to the entire circumference of the screw portion 1A by the leveling means 7, it is possible to effectively prevent loosening in the 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, and the present invention has the following structure of the device for manufacturing a locking screw. Not specified.

Further, in this specification, for easy understanding of the claims, the numbers corresponding to the members shown in the embodiments are referred to as "claim column", "action column", and "action column". It is added to the members shown in the section of "Means for Solving the Problems". However, the members shown in the claims are
It is by no means specific to the members of the examples.

In the apparatus for manufacturing the loosening prevention screw shown in FIG. 2, the lock paint 2 is sprayed and applied on the transfer means 4 for transferring while rotating the screw 1, and the screw portion 1A of the screw 1 transferred by the transfer means 4. The spray nozzle 5 for supplying the lock paint 2, the paint supply means 6 for supplying the lock paint 2 to the spray nozzle 5, and the leveling means 7 for uniformly leveling the applied lock paint 2 are provided.

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

As shown in FIGS. 3 and 4, a screw is supplied from the supply guide 10 to the V groove 8A of the disk 8. The supply guide 10 has its tip brought close to the outer periphery of the disk 8 and
It is arranged in a downward slope toward. The V groove 8A is open at the outer periphery. Therefore, the screw 1 supplied here
Is required to fall from the V groove 8A. V groove 8A
In order to prevent the screws from falling off, an outer circumference guide 11 is arranged along the outer circumference of the disk 8. Perimeter guide 1
Reference numeral 1 does not contact the outer circumference of the disk 8 but is arranged close to it. The outer circumference guide 11 is not arranged on the entire circumference of the disk 8. In the portion where the outer peripheral guide 11 is not provided, the screw is prevented from falling from the V groove 8A by the rotating member of the rotating means 9.

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

The rotating disk 12 has its central axis fixed to the central axis of the disk 8 and is horizontally arranged apart from the disk 8 as shown in FIG. On the outer circumference of the turntable 12, the V groove 8
A rotary hole 12A for inserting the rotary member 13 is provided right above the A, to be exact, right above the screw 1 guided by the V groove 8A. The rotation hole 12A has a cylindrical shape, and the rotation member 1 is provided here.
3 is rotatably inserted, and the rotary member 13 is vertically movably inserted.

The rotary member 1 inserted through the rotary 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 falling from the V groove 8A. The rotating member 13 has a screw head 1 at the lower end.
In order to insert the screw into the + groove of B and rotate the screw 1, the driver protrusion 13A that can be inserted into the + groove of the screw head 1B is provided. Further, the rotating member 13 has a pulley 1 at the upper end.
With 3B. The pulley 13B is hung on the belt 16 to rotate the rotating member 13. In addition, the pulley 13
As shown in FIGS. 4 and 5, B slides on the upper surface of the cam 15 to lower and raise the rotating member 13 to a predetermined position. The rotating member 13 is designed to have the entire length in which the driver protrusion 13A at the lower end is fitted into the + groove of the screw head 1B when the rotating member 13 is lowered. Driver protrusion 13A of rotating member 13
When the screw head 1B is fitted into the screw head 1B, the rotating member 13
The screw is held in the V groove 8A. This is because the rotary member 13 is located right above the screw 1 and is moved together with the screw 1, and the screw head 1B is hooked in the V groove 8A.

As shown in FIGS. 5 and 6, the cam 15 slides the pulley 13B of the rotating member 13 on 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 as shown in FIG. 5 at a position where the driver protrusion 13A of the rotating member 13 is fitted into the screw head 1B. Rotating member 1 lowered
3 is a screw 1 supplied from the supply guide 10 to the V groove 8A.
Is rotated and transferred to apply the lock paint 2. After applying the lock paint 2, the rotating member 13 is lifted by the cam 15 to eject the screw 1 from the V groove 8A. The cam 15 is arranged on the outer periphery of the rotary disk 12 except for the portion from the position where the screw 1 is supplied to the V groove 8A to the time when the lock paint 2 is applied and discharged.

The rotary member 13 which is not lifted by the cam 15, in other words, the rotary member 13 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 rotating disk 12 and an idle pulley 1 for arranging the belt 16 at a predetermined position.
8 and a drive pulley 17 that drives the belt 16. The drive pulley 17 is connected to a motor (not shown). The motor rotates the drive pulley 17, and the drive pulley 17 drives the belt 16. Belt 16
It is arranged at a position where the pulley 13B of the lowered rotating member 13 can be hooked. The lowered rotating member 13 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 groove 8A on the rotating disk 8.
Supply screw 1 to. 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 from the V groove 8A to the outside by the outer peripheral guide 11. When the disk 8 is rotated, the rotating member 13 located right above the screw 1 is lowered, and the driver protrusion 13A of the rotating member 13 is fitted into the + groove of the screw head 1B. The rotating member 13 that has descended is rotated by the pulley 13B being hooked on the belt 16 of the driving means 14. The driver protrusion 13A of the rotating member 13 is the screw head 1B.
The screw 1 inserted in the is transferred while being rotated by the rotating member 13. In this state, the screw 1 is attached to 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, the outer peripheral guide 11 is omitted at the position where the driver protrusion 13A of the rotating member 13 is fitted into the screw head 1B. The screw 1 transferred while being rotated in the V groove 8A by the rotating member 13 has the lock paint 2 applied to the screw portion 1A by a mechanism described later. The screw 1 in which the lock paint 2 is applied to the screw portion 1A is
The rotating member 13 is raised by the cam 15 and taken out from the V groove 8A to the outside, and the lock paint 2 is dried and cured.

The lock paint 2 is applied by the injection nozzle 5 to the screw 1 which is transferred while rotating in the V groove 8A of the disk 8. The injection nozzle 5, as shown in FIGS. 2 and 7,
It is arranged 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 arranged with its tip close to the surface of the screw portion 1A. The spray nozzle 5 sprays the lock paint 2 only when the lock paint 2 is supplied from the paint supply means 6 and the screw 1 is moved forward.

The paint supply means 6 has a sensor 19 for detecting the screw 1 being transferred in front of the injection nozzle 5, a timer (not shown) for starting counting by the output of the sensor 19, and a timer for time-up. At this time, the control valve 20 that is temporarily opened and the pressure tank 21 that pressurizes the control valve 20 to supply the lock paint 2 are provided. The set time of the timer is set to the time when the screw 1 passing through the sensor 19 moves to the front 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 of this structure performs the following operation, and the spray nozzle 5 sprays the lock paint 2 onto the screw 1. The screw 1 transferred while being rotated in the V groove 8A of the disk 8 passes in front of the sensor 19 and is detected by the sensor 19. The timer starts counting, and when it is time for the screw 1 to pass in front of the injection nozzle 5, the timer expires. This is because the set time of the timer is set to the time when the screw 1 passes in front of the sensor 19 and moves in front of the injection nozzle 5 from the rotation speed of the disk 8. When the timer times out, the control valve 20 is temporarily opened. When the control valve 20 is opened, the lock paint 2 in the pressure tank 21 passes through the control valve 20 and is jetted from the jet nozzle 5. After the fixed amount of the lock paint 2 is sprayed, 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 device 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 large area, and the lock paint 2 can be reliably applied to the screw 1. There is a feature that can be attached to.

The leveling means 7 leveles the lock paint 2 applied to the screw portion 1A in the circumferential direction, and is arranged close to the outer circumference of the disk 8 as shown in FIG. The screw 1 coated with the lock paint 2 is transferred while being rotated in the V groove 8A by the rotating member 13. The lock paint 2 applied to the surface of the screw portion 1A is leveled in the circumferential direction and adjusted to have a uniform film thickness when the rotating screw 1 contacts the surface of the leveling means 7. The leveling means 7 is elastically pressed by the spring 22 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.

Screw 1 in which lock paint 2 is leveled by leveling means 7
The rotating member 13 rises and is discharged from the V groove 8A,
Dry the lock paint 2.

[0028]

According to the apparatus for manufacturing a locking screw according to the present invention, the lock paint is sprayed and applied to the thread portion of the screw transferred by the transfer means by the injection nozzle, and the lock paint is applied in the circumferential direction by the leveling means. Configure to level. The device for applying the lock paint in this state can apply an accurate amount of the lock paint to the predetermined position of the screw portion. In particular, the loosening screw manufacturing apparatus of the present invention can apply the lock paint to a portion of the screw portion excluding the tip. A screw with no lock paint applied to its tip can be easily screwed into the screw hole, just like a screw without lock paint applied. The lock paint applied to the screw portion is in a state of entering between the screw portion and the screw hole after the screw is screwed into the screw hole to a predetermined depth. When the lock paint comes into the gap between the screw portion and the screw hole, the rotational torque for tightening the screw becomes slightly large. However, in this state, the tip of the screw portion is already engaged with the screw hole and screwed, so that 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 a screw to which the lock paint is not applied, the screw capable of being prevented from being screwed in and loosened can be efficiently mass-produced.

Further, in the loosening prevention screw manufacturing apparatus according to the present invention, the lock paint sprayed on the screw portion by the injection nozzle is evenly applied in the circumferential direction by the leveling means, so that it is uniformly applied around the screw. It is possible to manufacture screws that are coated with lock paint. Therefore, the screw manufactured by this device has a feature that it can effectively prevent loosening.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a screw having a lock coating applied to a screw portion is screwed in with 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 the disk of the transfer means.

FIG. 4 is a vertical sectional view of a portion for supplying a screw to the disk of the 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 driving means for rotating a rotating member.

FIG. 7 is a vertical sectional view showing a portion where the lock paint is sprayed and applied to the screw.

[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 means 8 ... Disk 8A ... V groove 9 ... Rotating means 10 ... Supply guide 11 ... Perimeter guide 12 ... Rotating plate 12A ... Rotating hole 13 ... Rotating member 13A ... Driver protrusion
13B ... Pulley 14 ... Driving means 15 ... Cam 16 ... Belt 17 ... Driving pulley 18 ... Idle pulley 19 ... Sensor 20 ... Control valve 21 ... Pressure tank 22 ... Spring

Claims (1)

[Claims] 1. A lock paint (2) is sprayed onto the surface of a transfer means (4) for transferring the screw (1) and the screw part (1A) of the screw (1) transferred by the transfer means (4). The injection nozzle (5) arranged at the position where the screw (1) is transferred to the front of the injection nozzle (5) is detected, and a predetermined amount of lock paint ( 2) Paint supply means (6) for supplying the
Equipped with a leveling means (7) for leveling the lock paint (2) applied to the surface of (A) in the circumferential direction, the transfer means (4) transfers the screw (1), and the injection nozzle (5) Spray the lock paint (2) onto the screw part (1A) of the screw (1) transferred forward, and
An apparatus for manufacturing a locking screw, which is configured such that the lock paint (2) applied to the surface of (1A) is evenly leveled by a leveling means (7).