JPH05229633A - Screw feed device - Google Patents

Abstract

PURPOSE:To provide a screw feed device capable of preventing the failure of performing an automatic screw tightening process, and the interruption of production due to the stoppage of screw feed to an automatic screw tightening machine. CONSTITUTION:Constitution is so made that there are provided a brush 13 moving in a direction approximately orthogonal with a scoop 2 for sweeping screws improperly placed in the groove 20 of the scoop 2 and the groove of a chute 6, and a screw scraping rod 19 moving approximately in parallel to the scoop 2 at both sides thereof for shifting the screws at both of the scoop 2 and the chute 6. According to this constitution the screws are not entrapped with the chute 6 and a gate 7, and can be kept in proper state. Thus, the stoppage of an automatic screw tightening machine can be prevented, and continuous production can be carried out via smooth and automatic screw tightening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw feeder for an automatic screw tightening machine.

[0002]

2. Description of the Related Art Conventionally, in a screw feeder for an automatic screw tightening machine, when the gate dispels a screw that is not correctly placed on the groove of the chute, the screw is caught between the chute and the gate. The supply stops and automatic screw tightening becomes impossible. Further, when the screw is bitten, the chute and the gate are greatly damaged, and the biting is further promoted. Also, if there is a screw that is not correctly placed in the groove of the scoop plate at the beginning of the groove of the scoop plate, even if there are screws that are aligned, they will not be supplied correctly to the chute. When trying to solve them, the structure became complicated and there were many problems.

A conventional example will be described below with reference to FIG. As shown in FIG. 5, screws are inserted in the screw storage box 1, and a scooping plate 2 having a groove 20 for scooping the screws is sliding. By rotating the cam 5 of the electric motor 3, the scooping plate 2 moves about the fulcrum shaft 4 as shown by arrows A and B. On the other hand, the gate 7 moving in the direction of the arrow D sliding on the chute 6 by the lever 8 catches the screw which is not correctly placed in the groove 21 of the chute 6. In addition, the spring 9 fixed to the hook 10 causes the gate 7 to shoot in the direction of arrow C.
Slide on. When the scooping plate 2 scoops the screw of the screw storage box 1 and the scooping plate 2 is substantially aligned with the chute 6 as shown in FIG. 7, the screw slides through the groove 20 of the scooping plate 2 and passes through the gate 7 (as in the case of the screw 11). ) Sliding down into the groove 21 of the chute 6. After that (not shown), it is supplied to an automatic screw tightening machine and is automatically screwed.

[0004]

However, in this structure, when the screw is not correctly placed on the groove 21 of the chute 6 as shown in FIG. 8, the screw is removed by the gate 7. However, sometimes the chute 6 and the gate 7 cause a screw to be caught as shown in FIG. In that case, the screw supply is stopped and the automatic screw tightening cannot be performed, and the production is stopped. In that case, the chute 6 and the gate 7 are scratched. Further, the damage easily causes the screw to be caught in the chute 6 and the gate 7, increasing the number of times the production is stopped.

On the other hand, if the leading screw placed on the groove 20 of the scooping plate 2 as shown in FIG. 6 is not correctly placed on the groove 20 of the scooping plate 2, the screw is placed on the groove 21 of the chute 6 as shown in FIG. Is not placed correctly, the screw is dispelled by the gate 7 and the screw is not supplied, and the efficiency of automatic supply is reduced. In the worst case, as shown in FIG. 8 to FIG. 9, the screw may be caught, so that the screw supply is stopped, the automatic screw tightening cannot be performed, and the production is stopped. There were the above problems.

Therefore, according to the present invention, the screws which are not correctly placed in the groove 20 of the scooping plate 2 are removed, all the screws are correctly aligned in the groove 20 of the scooping plate 2, and the screws 21 are correctly placed in the groove 21 of the chute 6. To remove all the unscrewed screws and ensure that all the screws are properly placed in the groove 21 of the chute 6, and as a result, there is no biting of the screws by the chute 6 and the gate 7 to always provide a smooth automatic screw supply. Is the first purpose.

On the other hand, the screw which is not properly placed in the groove 21 of the chute 6 is wiped off by the gate 7 and accumulated in a mountain shape up to the vicinity of the upper portion of the groove 21 of the chute 6 and is properly placed in the groove 21 of the chute 6 by the gate 7. Unable to push away the screws that have not been screwed, the screw supply is stopped and automatic screw tightening cannot be performed, and production stops. In the worst case, the screw that cannot be removed may be caught in the chute 6 and the gate 7 as shown in FIG. 9, so that the screw supply is stopped and the automatic screw tightening cannot be performed, and the production is stopped. In that case, the chute 6 and the gate 7 may be damaged by the biting of the screw. Further, there is a problem in that the damage easily causes a screw to be caught in the chute 6 and the gate 7 and the number of times of production stop increases.

Therefore, according to the present invention, the screw has the groove 2 of the chute 6.
The second purpose is to prevent accumulation in the shape of a mountain up to the vicinity of the upper part of 1.

On the other hand, as shown in FIG. 10, on the other hand, a rodless cylinder (a metal block 12-3 located outside the cylinder by moving the permanent magnet 12-2 inside the cylinder having air supply ports on both sides by air pressure) is used. Move the air cylinder 12), lock device 14, and brush 13
A third object is to make the pin 13-2 fixed to the shaft, the shaft 18 provided with the oblique groove 18-2, and the like into a light and small size.

On the other hand, as shown in FIG.
A fourth object is to construct a light weight small compact in which the screw bar 19 is interlocked with the scooping plate 2.

[0011]

In order to achieve the above-mentioned object, the present invention provides a groove 20 and a chute 6 of the scooping plate 2.
In order to move screws that are not correctly placed in the groove 21 of the scooping plate 2 in order to move away screws that are not correctly placed, and in order to move the screws on both sides of the scooping plate 2, the scooping plate 2 and the scooping plate 2 are substantially formed on both sides of the scooping plate 2. A screw scraping bar 19 that moves in parallel is provided.

[0012]

In the screw feeder of the present invention, all the screws which are not correctly placed in the grooves 20 of the scooping plate 2 are removed by the brush 13 which moves in a direction substantially perpendicular to the scooping plate 2 so that all the screws are inserted into the grooves 20 of the scooping plate 2. Are aligned. Therefore, the groove 21 of the chute 6
The screw can be supplied correctly. On the other hand, the screws that are not correctly placed in the grooves 21 of the chute 6 are removed by the brush 13 that moves in a direction substantially perpendicular to the scooping plate 2, and the screws are correctly aligned in the grooves 21 of the chute 6. Therefore, the screw can smoothly pass through the gate 7 and the screw can be supplied correctly.

On the other hand, the screws that are not correctly placed in the groove 21 of the chute 6 are wiped away by the gate 7 and accumulated in a mountain shape up to the vicinity of the upper part of the groove 21 of the chute 6 on both sides of the scooping plate 2. Screws that are moved substantially in parallel with are removed by the screw bar 19 and screws that are not correctly placed in the groove 21 of the chute 6 are pushed away by the gate 7 so that the screws are correctly aligned in the groove 21 of the chute 6. Therefore, the screw can smoothly pass through the gate 7 and the screw can be supplied correctly. Therefore, there is no screw biting between the chute 6 and the gate 7, and maintenance and inspection is not required and the automatic screw tightening machine can be stopped.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A screw feeder according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a screw storage box 1 contains a screw, and a scooping plate 2 having a groove 20 for scooping the screw is sliding. The fulcrum shaft 4 is rotated by the rotation of the cam 5 of the electric motor 3.
The scooping board 2 moves around the center as shown by arrows A and B. The arrow D sliding on the chute 6 by the lever 8
With the gate 7 moving in the direction of, the screw which is not properly placed on the chute 6 (see FIG. 8) is caught. Further, the gate 7 moves in the direction of arrow C in conjunction with the cam 5 by the spring 9 fixed to the hook 10. When the scooping plate 2 scoops the screw of the screw storage box 1 and the scooping plate 2 is substantially aligned with the chute 6 as shown in FIG. 7, the screw slides in the groove 20 of the scooping plate 2 and the gate 7
And slides down into the groove 21 of the chute 6 (like screw 11). After that (not shown), it is supplied to an automatic screw tightening machine and is automatically screwed. An air cylinder 12 is provided above the screw storage box 1 and extending in a direction substantially perpendicular to the scooping plate 2, and the scooping plate 2 is provided by the air cylinder 12.
And a brush 13 that moves in a substantially vertical direction are provided. The position of the brush 13 is such that the scooping plate 2 is located before the scooping plate 2 is substantially in line with the chute 6.
The screw 20 which is not correctly placed in the groove 20 and the screw 21 which is not correctly placed in the groove 21 of the chute 6 are removed. The lock device 14 for driving the air cylinder 12 is composed of a drive air switch 15 for driving the air cylinder 12 provided above the screw storage box, and an operation lever 16 for operating the drive air switch 15 in the vicinity thereof. The operation switch 16 is arranged so as to come into contact with the scooping plate 2 before the scooping plate 2 is substantially aligned with the chute 6. In FIG. 4, when the operation lever 16 is once pressed, the gear 16-2 rotates by one gear, and the mountain of the cam-shaped 16-3 that is rotated by them rotates the switch pressing plate 17 to lock the drive air switch 15. After that, air is supplied from one direction of the air cylinder 12 and the permanent magnet 12-2 in the air cylinder 12 is pushed in one direction and locked. Link 13 with the permanent magnet 12-2
The metal block 12-3 marked with is locked in one direction. Next, when the operation lever 16 is pressed once again, the gear 16-2 rotates by one gear and the cam-like 1
The crest 6-3 rotates, the switch holding plate 17 is lowered by the returning force of the actuator 15-2 of the drive air switch 15, and the drive air switch 15 is released. Air is supplied from the opposite direction of the air cylinder 12 and the permanent magnet 12-2 in the air cylinder 12 is pushed and locked in the opposite direction. The metal block 12-3 with the brush 13 interlocked with the permanent magnet 12-2 is locked in the opposite direction. Above the screw storage box 1,
Shaft 18 having diagonal groove 18-2 near brush 13
Are arranged substantially vertically to the scooping plate 2. Screw scooping rods 19 are provided on both sides of the shaft 18 and on both sides of the scooping plate 2. The pin 13-2 comes out from the brush 13 and engages with the diagonal groove 18-2 of the shaft 18. Screw stick 1
In No. 9, when the brush 13 moves in one direction, the shaft 18 rotates and the screw scraping bar 19 moves in one direction. Screw stick 19
When the brush 13 moves in the reverse direction, the shaft 18 rotates in the reverse direction, and the screw bar 19 moves in the reverse direction. Before the scooping plate 2 is substantially in line with the chute 6, the scooping plate 2 comes into contact with the operating lever 16 and the drive air switch 15 is locked, and the brush 13 moves in one direction and is not correctly placed in the groove 20 of the scooping plate 2. And the screws that are not correctly placed in the groove 21 of the chute 6 are also removed.

[0016]

As described above, the following effects can be obtained in the screw supply device according to the first aspect.

(1) Before the scooping plate 2 is substantially aligned with the chute 6, the brush 13 moves on the upper surfaces of the grooves 20 of the scooping plate 2 and the grooves 21 of the chute 6 in a direction substantially perpendicular to the scooping plate 2. Therefore, remove the screws that are not correctly placed in the groove 20 of the scooping plate 2.

(2) The brush 13 moves on the upper surface of the groove 20 of the scooping plate 2 and the upper surface of the groove 21 of the chute 6 in a direction substantially perpendicular to the scooping plate 2 before the scooping plate 2 is substantially aligned with the chute 6. Therefore, the screw that is not correctly placed in the groove 21 of the chute 6 is removed.

(3) Before the scooping plate 2 is substantially aligned with the chute 6, the brush 13 moves on the upper surfaces of the grooves 20 of the scooping plate 2 and the grooves 21 of the chute 6 in a direction substantially perpendicular to the scooping plate 2. Therefore, the screw accumulated in a mountain shape is dispelled to the vicinity of the upper portion of the groove 21 of the chute 6.

Therefore, it is possible to automatically and smoothly supply the screws. Next, in the screw supply device according to the second aspect, the following effects can be obtained.

(1) Before the scooping plate 2 is substantially in line with the chute 6, the scooping plate 2 moves on both sides of the scooping plate 2 substantially in parallel with the scooping plate 2 and the screw scraping bar 19 for removing the screws moves. Screws accumulated in a mountain shape can be dispelled up to the vicinity of the upper portion of the groove 21.

Next, in the screw supply device of the third aspect, the following effects can be obtained. Since the operating lever 16 is operated by the abutment of the scooping plate 2 before the scooping plate 2 is substantially in line with the chute 6, the air cylinder 12 using the rodless cylinder, the locking device 14, and the brush 13 are fixed. The pin 13-2 and the shaft 18 provided with the slanted groove 18-2 can be designed to be lightweight and compact.

Next, in the screw supply device according to the fourth aspect, the following effects can be obtained. Metal block 1 with brush 13
When 2-3 slides on the air cylinder 12, the pin 13-2 fixed to the brush 13 has an oblique groove 18- on the shaft 18.
Since the shaft 18 rotates by sliding 2 and the screw scraping bar 19 moves, the brush 13 and the screw scraping bar 19 interlock with the scooping plate 2 to make a lightweight and compact design.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main part of a screw supply device according to an embodiment of the present invention.

FIG. 2 is an external perspective view of a screw supply device according to an embodiment of the present invention.

FIG. 3 is an explanatory view in which a drive air switch of a main part of the screw supply device in one embodiment of the present invention is not locked.

FIG. 4 is an explanatory view in which a drive air switch of a main part of the screw supply device in one embodiment of the present invention is locked.

FIG. 5 is an external side sectional view of a conventional screw supply device.

FIG. 6 is a view showing a case where the screws are not correctly placed in the groove of the scooping plate.

FIG. 7 is a diagram showing a case where a screw is correctly placed in the groove of the scooping plate, slides properly in the groove of the chute, and passes through the gate correctly.

FIG. 8 is a diagram showing a case in which screws are not correctly placed in the groove of the chute.

FIG. 9 is a view showing a case where a screw is caught in the gate of the chute.

FIG. 10 is a view showing a case where an air cylinder and a screw stick are interlocked.

[Explanation of symbols]

 1 screw storage box 2 scooping plate 3 electric motor 4 fulcrum shaft 5 cam 6 chute 7 gate 8 lever 9 spring 10 hook 11 screw 12 air cylinder 13 brush 14 locking device 15 drive air switch 16 operation lever 17 switch holding plate 18 shaft 19 screw scraping Rod 20 Scoop plate groove 21 Chute groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Horikawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A screw storage box, a scooping plate having a groove for scooping screws from the screw storage box, an electric motor, a fulcrum shaft of the scooping plate, and the scooping plate with the fulcrum shaft of the scooping plate as an axis. A cam provided on the electric motor for sliding, a chute that is substantially in line with a position where the scooping plate slides and stops, and a screw that feeds a screw along the groove; and a chute of the chute. The gate that slides off the screw that is not correctly mounted on the chute and slides it on the chute when the scooping plate slides down by the electric motor to almost the bottom of the screw storage box. The lever that slides the gate in conjunction with the cam in order to remove screws that are not correctly placed in the groove of the chute into the screw storage box, and the scooping plate in a position substantially in line with the chute. When the gate is energized, A spring for sliding the gate in the feeding direction of the screw, a hook for the spring, a fulcrum shaft for the screw storage box, the electric motor and the scooping plate, the chute, the hook for the spring, etc. And a screw supply provided with a brush that moves the upper surface of the groove of the scooping plate and the upper surface of the groove of the chute in a direction substantially perpendicular to the scooping plate before the scooping plate is substantially aligned with the chute. apparatus. 2. A screw storage box, a scooping plate having a groove for scooping screws from the screw storage box, an electric motor, a fulcrum shaft of the scooping plate, and the scooping plate with the fulcrum shaft of the scooping plate as an axis. A cam provided on the electric motor for sliding, a chute that is substantially in line with a position where the scooping plate slides and stops, and a screw that feeds a screw along the groove; and a chute of the chute. The gate that slides off the screw that is not correctly mounted on the chute and slides it on the chute when the scooping plate slides down by the electric motor to almost the bottom of the screw storage box. And a lever that slides the gate in conjunction with the cam in order to remove screws that are not correctly placed in the groove of the chute into the screw storage box, and a position where the scooping plate is substantially in line with the chute. When the bias of the gate is A spring for sliding said gate to supply direction of the screw rambling bar, the hook of the spring,
The screw storage box, the electric motor, a fulcrum shaft of the scooping plate, and a stand provided with the chute, the hook of the spring, and the like, and the scooping plate of the scooping plate before the scooping plate is substantially aligned with the chute. A screw feeding device provided with screw scraping rods that move substantially parallel to the scooping plate on both sides and remove the screws. 3. A screw storage box, a scooping plate having a groove for scooping screws from the screw storage box, an electric motor, a fulcrum shaft of the scooping plate, and the scooping plate with the fulcrum shaft of the scooping plate as an axis. A cam provided on the electric motor for sliding, a chute that is substantially in line with a position where the scooping plate slides and stops, and a screw that feeds a screw along the groove; and a chute of the chute. The gate that slides off the screw that is not correctly mounted on the chute and slides it on the chute when the scooping plate slides down by the electric motor to almost the bottom of the screw storage box. The lever that slides the gate in conjunction with the cam in order to remove screws that are not correctly placed in the groove of the chute into the screw storage box, and the scooping plate in a position substantially in line with the chute. When the gate is energized, A spring for sliding the gate in the feeding direction of the screw, a hook for the spring, a fulcrum shaft for the screw storage box, the electric motor and the scooping plate, the chute, the hook for the spring, etc. Before the scooping board is in substantially straight line with the chute, screw scoops that move substantially parallel to the scooping board on both sides of the scooping board, and before the scooping board and the chute are in substantially straight line A brush that removes screws that are not correctly placed on the scooping plate and the chute, a metal block that is above the screw storage box and passes in a direction substantially perpendicular to the scooping plate, and has the brushes, An air cylinder that slides the metal block through the hole of the metal block,
A drive air switch which is above the screw storage box and drives the air cylinder; an operation lever which is above the screw storage box and in the vicinity of the drive air switch and which comes into contact with the scooping plate; A lock device that locks or unlocks the drive air switch by the operation of the scooping plate coming into contact with the operation lever, and an internal supply of air from the drive air switch to relay the drive air switch and the air cylinder. A metal valve of the relay valve for changing the direction of the air supplied to the air cylinder, and an air hose connecting the air cylinder, the drive air switch and the relay valve, the scooping plate and the chute. Before operating the operation lever by touching the scooping plate, the operation lever should be operated in a substantially straight line. Bis feeder. 4. A screw storage box, a scooping plate having a groove for scooping screws from the screw storage box, an electric motor, a fulcrum shaft of the scooping plate, and the scooping plate with the fulcrum shaft of the scooping plate as an axis. A cam provided on the electric motor for sliding, a chute that is substantially in line with a position where the scooping plate slides and stops, and a screw that feeds a screw along the groove; and a chute of the chute. The gate that slides off the screw that is not correctly mounted on the chute and slides it on the chute when the scooping plate slides down by the electric motor to almost the bottom of the screw storage box. The lever that slides the gate in conjunction with the cam in order to remove screws that are not correctly placed in the groove of the chute into the screw storage box, and the scooping plate in a position substantially in line with the chute. When the gate is energized, And a stand provided with a hook for the gate, a hook for the spring, the screw storage box, the fulcrum shaft of the electric motor and the scooping plate, the chute, the hook of the spring, and the like. Before the scooping plate is substantially in line with the chute, screw scrapers that move substantially parallel to the scooping plate on both sides of the scooping plate, and before the scooping plate and the chute are in substantially straight line A brush for removing screws that are not correctly placed on the scooping plate and the chute, a metal block above the screw storage box and passing in a direction substantially perpendicular to the scooping plate, and having the brush, and the metal. An air cylinder that slides through the hole of the block to slide the metal block, a drive air switch that is above the screw storage box and drives the air cylinder, and the screw An operating lever that is above the storage box and near the drive air switch and that contacts the scooping plate, and locks and releases the drive air switch by the operation that the scissor plate contacts the operating lever. A lock device, a relay valve that changes the flow direction of the air supplied to the air cylinder by moving an internal metal valve by supplying air from the drive air switch to relay the drive air switch and the air cylinder, An air hose that connects the air cylinder, the drive air switch, and the relay valve, an oblique groove is provided above the screw storage box and near the brush, and the screw scraping rods are provided at both ends. A shaft, and a pin fixed to the brush and provided to face the shaft,
A screw supply device in which when the metal block with the brush slides on the air cylinder, the pin slides on the diagonal groove of the shaft, the shaft rotates, and the screw scraper moves.