JPS635227B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screw supply device that automatically supplies screws under a bit, and is capable of stably supplying even different kinds of screws, and moreover, is capable of correctly supplying screws to the bit center. This is what I am trying to do.

There are two types of screw supply in a screw tightening machine: the hopper method shown in FIG. 1 and the Y pipe method shown in FIG. 2. The hopper method is one in which a screw stored in a hopper is taken out onto a chute 1 by the swinging motion of the hopper, and the screw 2 slides down on the chute 1 and is supplied under the driver bit 3. The Y-pipe method is one in which the screws 5 are supplied by air pressure from one end of a Y-shaped pipe 4. These methods can provide a stable supply of screws when only screws of the same shape are supplied, but when supplying multiple types of screws with different neck lengths (the same screw head diameter) one after another, the hopper method Multiple hoppers must be attached to the head,
It is unreasonable in terms of structure and space. In addition, in the Y pipe method, if screws with different neck lengths are supplied, the Y
The screws get stuck at the joints of the molds, making it difficult to provide a stable supply.

Therefore, the present invention aims to provide a screw supply device that can stably supply screws with different head lengths and can also stably supply the screws to a bit center. An embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 3 and 4, the screw 9 that has been sent through the tube 6 by air pressure is supplied onto the chute 8 through the pipe 7. The chute 8 has a mortar-shaped structure on both sides, and a screw 9 in the center.
A slit 10 is provided through which the lower part of the neck passes. A pusher 11 is inserted behind the chute 8, and this pusher 11 is driven by a cylinder 12. The tip of the pusher 11 is inclined to receive the head of the screw 9. A lever 13 for preventing rocking is inserted into the slit 10 and urged counterclockwise by a spring 14 so as to hold the screw 9 between it and the pusher 11.

When the cylinder 12 is driven to move the pusher 11 to the left, the screw 9 is pushed by the pusher 11 and moves to the left. At this time, the lever 13 for preventing rocking is pushed by the screw 9 and rotates clockwise, so the lever 13
passes through this swing prevention lever 13. Screw 9 coming out of slit 10 is driver bit 15
is held in the catcher 16 below. Next, the driver bit 15 is lowered together with the bit holder 17, and the screw 9 is vacuum-adsorbed.

As shown in FIGS. 6a and 6b, the catcher 16 is constituted by a combination of parts A and B that are rotatably attached by shafts 18 and 19, and a screw 9 is attached to each of A and B. Plane portions 20 and 21 are formed on which the planar portion of the lower surface of the head abuts.
These flat parts 20 and 21 have notches 2 into which the screws 9 are inserted.
Further, protrusions 24 and 25 are provided on the side walls of the notches 22 and 23, and when the screw 9 enters the notches 22 and 23, it is restricted by the protrusions 24 and 25 and the screw 9 can be easily removed. will no longer come out from the notch. Further, since the screw 9 rests on the flat parts 20 and 21, it is correctly positioned.

As described above, the present invention prevents the screw sent to the chute by air pressure from rebounding and swinging when it falls forcefully from the tube to the chute, using the swing prevention lever. The screw can be held safely and reliably on the chute.Next, the screw on the chute is pushed by a sliding device and held by the catcher under the bit, so the length of the lower part of the screw neck can be reduced. Even if different screws are sent together, they can be stably held in the catcher. In addition, correct positioning is achieved due to the flat surface and protrusions provided on the catcher.

[Brief explanation of the drawing]

1 and 2 are a cross-sectional side view of a conventional screw supply device, FIG. 3 is a perspective view of a screw supply device according to an embodiment of the present invention, and FIG. 4 is a cross-sectional side view of the same device, and FIG. FIG. 5 is a sectional front view of a part of the device, and FIGS. 6a and 6b are a plan view and a sectional side view of the catcher of the same device. 6...Tube, 8...Chute, 9...Bis, 11...Putsha, 12...Cylinder, 15
...Bit, 16... Catcher, 20, 21...
...Flat part, 22, 23... Notch, 24, 25...
Protrusion.

Claims (1)

[Claims] 1. A means for sending screws using air pressure, a chute for holding the screws sent by this means, a sliding device for pushing and moving the screws placed on this chute, and a means for displacing the screws below the bits. The chute has a catch that receives the screws pushed out from the chute, and the chute has a lever in the direction of movement of the screws to prevent the screws sent by air pressure from rebounding and swinging. The catch has a flat part that contacts the lower surface of the screw head, a notch into which the shaft of the screw is inserted, and a side surface of the notch that is provided with a flat part that contacts the lower surface of the screw head, and a notch that is provided on the side surface of the notch to accommodate the screw that is inserted into the notch. A screw supply device characterized in that a screw supplying device is provided with a protrusion that prevents the screw from accidentally escaping from the notch.