JPH0347829Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a supply device for supplying screws to a worker who tightens screws with a screwdriver or the like.

[Background of the idea]

Conventionally, in order to improve the efficiency of screw installation work in screw tightening work, there have been methods such as picking up screws with a magnetized screwdriver bit and installing them on the tip of the bit, or using vacuum suction to pick up screws and installing them on the tip of the bit. has been used. In these methods, it is known that the screw mounting efficiency is improved by supplying screws one by one in front of the operator as the tightening work is performed, such as by the method described in Japanese Utility Model Application No. 57-75977. It is. However, in the method described in Japanese Utility Model Application No. 57-75977, screws are always supplied to the inclined chute connected to the screw separating device, so if the inclined chute is full of screws, The scoop plate also oscillates, resulting in a lot of waste, and this structure has the disadvantage of generating noise and vibration.

[Purpose of invention]

The object of the present invention is to eliminate the drawbacks of the conventional screw feeder and to provide a screw feeding device with less noise and vibration.

[Summary of the idea]

By installing a sensor on the inclined plate, the present invention allows the rake plate to be oscillated only when the screw on the inclined plate is less than a certain amount.
The relationship between the sensor and the tilted plate has been devised with a focus on eliminating unnecessary noise and vibration.

[Example of idea]

An embodiment of the present invention is shown in FIGS. 1 to 3. In Figs. 1 to 2, 1 is a pair of inclined chute;
2 is a hopper for storing screws, and 3 is a meniscus.
4 is a stand base, 5 is a column, and 6 is a column holder which is fixed to the meniscus 3.

A top adjuster 7 is fixed to the meniscus 3 by a plate 8 and screws 9, and limits the height of the head so that the screws 10 aligned on the chute 1 do not overlap each other. 11 is the separator and pin 1
2 to the meniscus 3, and the air cylinder 13
As a result, it swings around the pin 12. A bracket 14 is fixed to the stand base 4 with screws 15 and holds the air cylinder 13. 16 is a screw receiver with a U slightly wider than the thread diameter of screw 10.
It has a groove 16a and is welded and fixed to the stand base 4. Also, on the bottom of the screw receiver 16 is a proximity switch 1 that operates in response to metal such as the screw 10.
7 is fixed with a screw 18. 19 is a scoop plate fixed to the arm 20 with a screw 21, and a cam 23 fixed to the output shaft (not shown) of the motor 22.
The screws 10 in the hopper 2 are scooped up and aligned on the chute 1 by the rotation of the hopper. Reference numeral 24 denotes a photo sensor consisting of a light emitting diode 24a fixed to a sensor bracket 25 with screws 26 and a phototransistor 24b, and screws 1 aligned on the chute 1.
It operates by blocking or passing light through the 0 screw head. 27 is a motor holder that fixes the motor 22 to the meniscus 3.

In FIG. 3, 30 is a DC power supply, 31 is an NPN transistor that rotates or stops the motor 22, and the base is the phototransistor 2 of the photosensor 24.
It is energized by 4b. 32 is a solenoid valve that drives the air cylinder 13 and is activated when the normally open contact 17a of the proximity switch 17 or the manual switch 33 is turned on.

Next, the operation will be explained.

When the screw 10 on the screw receiver 16 is no longer used for tightening work, the proximity switch 17 is shut off, the solenoid valve 32 is shut off, the air cylinder 13 returns, and the separation device 11 swings (leftward in Figure 2) and rotates to the right. There is one screw 10 between the claw 28 and the left claw 29.
The screw slides down and is fed onto the screw receiver 16. When the screw 10 is captured by the screw receiver 16, the proximity switch 17 is turned on and the solenoid valve 32 is driven, and the air cylinder 13 swings the separating device (rightward in FIG. 2), and the screw is inserted between the right claw 28 and the left claw 29. 10 to 1
Keep them separate.

The manual switch 33 is a switch for manually dropping the screw 10 as desired. That is, by closing the contact of the manual switch 33, the solenoid valve 32 is driven, and the screw 10 is dropped into the screw receiver 16 in the same manner as described above.

In addition, the photo sensor 24 is attached to the inclined chute 1 with a screw 1.
0 are aligned and light to the phototransistor 24b is cut off, the transistor 31 is turned off to stop the rotation of the motor 22 and the swinging of the scoop plate 19. In other words, when the screw 10 is removed from the inclined chute 1, the phototransistor 24b is illuminated by the light emitting diode 24a, turning on the transistor 31, rotating the motor 22, swinging the scoop plate 19 as described above, and opening the hopper. The screw 10 in the section 2 is supplied to the inclined chute 1.

FIG. 4 shows an embodiment in which the screw supply device of the present invention is applied to an automatic screw tightening stand. In the figure, 34 is a stand column, 35 is a hopper, and 36
is the screwdriver, 37 is the screwdriver 3
6, a driver head 38, an air cylinder 39 that slides the driver head 37 up and down;
is a vacuum pipe that attracts the screw 43. 40 is a stand base, 41 is a guide column, and 42 is an object to be fastened.

In the figure, when the driver head is lowered by the air cylinder 38, the screw 43 is moved by the vacuum pipe 39.
is attracted and tightened. After tightening, there is no screw 43 in the screw receiving part 44, so the no-screw detector 4
5 is activated and the air cylinder 47 causes the separation device 46
is operated to supply the screw 43 to the screw receiving portion 44 and wait until the next screw tightening operation. Here, the screw receiving part 44 swings in the direction away from the chute 50 around the pin 49 due to the lowering of the vacuum pipe 39,
When the vacuum pipe 39 rises, it operates to restore its original state due to the tensile force of the spring 48.

[Effect of idea]

As explained above, according to the present invention, screws are supplied only when necessary to the inclined chute connected to the screw separating device, that is, when there are fewer screws on the inclined chute, thereby reducing waste. No noise or vibration will be generated.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the screw feeding device according to the present invention, and FIG. 2 is a view taken from the direction of arrow A in FIG. FIG. 3 is an electrical circuit diagram of the screw feeding device shown in FIG. 1. FIG. 4 shows a modification in which the screw supply device according to the present invention is applied to an automatic screw tightening machine. 1 is an inclined chute, 2 is a hopper, 10 is a screw,
11 is a separation device, 16 is a screw receiver, and 17 and 45 are screwless detectors.

Claims (1)

[Claims for Utility Model Registration] An inclined chute having a spacing slightly wider than the diameter under the neck of the screw, supporting the screw in a suspended state, and tilting so that the screw can slide down, a hopper portion for storing the screw; a separating device that separates the screws on the inclined chute one by one and slides them into the screw receiving part; a scoop plate that aligns the screws in the hopper part and supplies them to the inclined chute; and a scoop plate that passes the scoop plate through the hopper part. and a driving means for swinging the tilted chute to a position of the tilted chute, the screw supplying device having a driving means for swinging the tilted chute to the position of the tilted chute; A screw feeding device characterized in that it is provided with a sensor that generates an output signal for operating the drive means.