JPH0446720A - screw tightening machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a screw tightening machine for tightening hexagon head screws.

BACKGROUND ART Conventionally, when tightening a hexagon head screw, the screws are supplied in addition to a screw tightening head 20 and an orthogonal robot 21 that moves the screw tightening head 20 in the X-Y direction, as shown in FIG. A parts feeder 2Z was required for this purpose.

The parts feeder 22 includes a pole feeder 22a for aligning screws, and a linear feeder 22b for feeding the screws sent from the pole feeder 22a one by one to the screw tightening head 20.

Problems to be Solved by the Invention However, in the above configuration, a large space is required to use the parts feeder 22, and since the linear feeder 22b is installed directly below the screw tightening head 20, the movement of the orthogonal robot 21 is limited. There is a problem that the range is narrow, and there are also problems that the takt time from supplying the screws to tightening the screws is large and the cost is very high.

The purpose of the present invention is to solve the above-mentioned problems, and to provide a low-cost screw tightening machine that does not use a parts feeder and has a screw supply section mounted on a Cartesian robot, which does not take up much space. It is something to do.

Means for Solving the Problems In order to achieve the above object, the present invention includes a hopper for accommodating hexagon head screws, a scoop plate for feeding the screws from the hopper to a chute, and feeding the fed screws one by one by escape. a chute, a catcher provided at the screw exit end of the chute, a claw disposed below the catcher to support the screw, a slider for sliding the catcher, and a catcher that is horizontal and vertical. A cylinder to be moved, a suction pipe which is located at the top of the catcher after the cylinder has been moved and has a screw engaged at its tip to enable screw tightening, a driver for rotating the suction pipe, and a driver for rotating the suction pipe and the driver. The screw tightening machine consists of a driver section that moves up and down, and an orthogonal robot that mounts each of the above sections and moves them in the X-Y directions.

Operation Since the present invention has the above-described configuration, the hexagon head screw scoop plate housed in the hopper feeds the pieces to the chute, and one piece is fed to the catcher by escape. Next, the screw supplied to the catcher is supported by a claw so that the screw is not displaced. In this state, the catcher is moved by a cylinder to just below the suction pipe so that it is horizontal, then moved vertically upwards and a screw is inserted into the slowly rotating suction pipe. After adsorbing the screw, the escape returns to its original position. at the same time,
The orthogonal robot performs positioning, rotates the suction pipe, and tightens the screws.

Example Below, the first example of a screw tightening machine which is an example of the present invention will be explained.
This will be explained with reference to FIGS.

In FIGS. 1 and 2, l is a screw tightening head that performs screw tightening, 2 is an orthogonal robot, and the screw tightening head 1 is an orthogonal robot.
This is a robot that carries a robot and moves it in the X-Y direction. 3
is a hopper, which is attached to the screw-driving head l to hold the screws. 4 is chute, hopper 3
The screws are sent to Rad 1 for tightening. 3
a is a scoop plate that supplies screws to chute 4;

In FIGS. 3 and 4, 5 is a screw, and 6 is an escape, which feeds the screws 5 on the chute 4 one by one. Reference numeral 7 denotes a catcher, which has a U-shaped groove that guides the bottom of the screw head.

Further, as shown in FIGS. 3 and 4, the claw 8 attached to the lower part of the catcher 7 moves the roller 10 along the guide 11 by the action of the spring 9 attached to the catcher 7 and the claw 8, and the screw 5 The screw 5 is held under the neck to prevent the screw 5 from shifting. The slider 13 attached to the frame 12 attracts the catcher 7 with a suction device 714.
(See Figures 4 and 5). A catcher 7
Level it horizontally and pull it vertically upwards.

Further, as shown in FIG. 6, the suction pipe 14 has a box 14a at its tip that engages with a screw and can be tightened, and is rotated by the drive of a driver 18 to tighten the screws. The driver section 19 raises and lowers the suction pipe I4 and the driver 18.

The operation of the screw tightening machine configured as described above will be described below with reference to FIGS. 1 to 6.

In FIGS. 1 and 2, a hexagonal head screw 5 placed in a hopper 3 is fed to a chute 4 by a scoop plate 3a. At this time, the screws 5 are aligned on the chute 4, sent by their own weight to the exit of the chute 4, and sent one by one to the catcher 7 by the escape 6 (Fig. 3), which receives the screws 5. 7 is moved by the slider 13 to just below the suction pipe 14 (FIGS. 4 and 5). At that time, slider 1 should be
3 moves, the roller IO moves along the guide II by the action of the spring 9, so that the claw 8 presses down the bottom of the screw 5. When the screw 5 is directly below the suction pipe 14, lift up the rod 16a of the cylinder 16 and release the spring 1.
7, the catcher 7 is pulled up while being held horizontally, and the screw 5 is pushed into the box 14a of the suction pipe 14 which is rotating slowly, so that the screw 5 is suctioned. screw 5
When the suction is completed, the catcher 7 returns to its original position so as not to interfere with the screw tightening of the workpiece. Simultaneously with the above operations, the orthogonal robot 2 performs positioning for screw tightening. After completing the positioning for screw tightening, use the screwdriver 18
While rotating the suction pipe 14,
9 to lower the workpiece and tighten the screws.

Effects of the Invention As described above, according to the present invention, a parts feeder is not used and the screw supply section is also mounted on the orthogonal robot, so it can be used in a small space, and it is possible to reliably tighten screws at low cost. It is now possible to provide a compact screw tightening machine for tightening hexagon head screws.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a screw tightening machine shown as an embodiment of the present invention, FIG. 2 is a plan view of the same screw tightening machine, and FIG. 3 is an enlarged side view of a part of the catcher to which screws are supplied. Fig. 4 is an enlarged plan view of a part of the catcher to which the screw is supplied, Fig. 5 is an enlarged plan view of part of the catcher with the screw moved directly below the suction pipe, and Fig. 6 is an enlarged plan view of the catcher in which the screw has been moved to the suction pipe. FIG. 7 is an enlarged side view of a part of the catcher in a state where the catcher is in a closed state, and FIG. 7 is a plan view of a conventional screw tightening machine using a parts feeder. 2... Cartesian robot 3... Hopper 4... Chute 5... Screw 6... Escape 7...
・Catcher 8...Claw 13...Slider 14...Suction pipe 16・
...Cylinder 18...Driver I9...Driver part Figure 2 Figure 5: Screw 8: Claw Figure 4 Figure 5 Figure 6] 3 /

Claims (1)

[Claims] A hopper that accommodates hexagon head screws, a scoop plate that supplies the screws from the hopper to a chute, a chute that conveys the supplied screws one by one by escape, a catcher provided at the screw exit end of this chute, and this catcher. a claw disposed below to support the screw; a slider for sliding the catcher; and a cylinder for horizontally moving the catcher in the vertical direction;
a suction pipe that is located at the top of the catcher after the cylinder is moved and has a screw engaged at its tip to enable screw tightening; a driver that rotates the suction pipe; and a driver section that raises and lowers the suction pipe and driver; A screw tightening machine comprising an orthogonal robot that mounts each of the above parts and moves them in the X-Y direction.