JPS5911416B2 - Automatic parts assembly equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is useful when a large number of electronic components are placed on a printed wiring board coated with cream solder and heat welded, or when a plurality of electronic components are placed on a gear shaft installed upright on the base plate of a clock movement. Relating to an automatic parts assembly device that drops child parts at the right timing and assembles the child parts one after another at predetermined locations on the parent part without stopping the conveyor that conveys the parent part when inserting gears, etc. It is something.

In the conventional automatic assembly apparatus of this type, the conveyor that conveys the parent part is stopped to attach the child part.

For example, when assembling a large number of gears to the main plate on a watch train production line, the movable table that transports the main plate had to be stopped for each gear insertion device to perform the assembly.
Errors caused by pitch errors, backlash, etc. of the conveyor device became a problem, and in order to improve accuracy, the device became expensive and the line speed could not be increased. The present invention improves assembly accuracy using inexpensive equipment by making a conveyor run continuously at a constant speed and dropping each child part from a stationary position onto the parent part at a predetermined timing to perform automatic assembly. The purpose is to shorten assembly time and improve productivity. The present invention will be described in detail below using an example in which the present invention is applied to an assembly device for a movement of a quartz watch.

FIG. 1 explains the main parts of the present invention, in which the main plate 1 of the movement is the main part, the gear 2 is the child part, and both 15
This is for assembling parts 1 and 2. In figure a,
The base plate 1 is conveyed horizontally to the right in the figure by the conveyor 3, and the gear 2 is held by the dropping device 4 and lowered to a predetermined position, where it stands still in the state shown in figure b. Next, the dropping device '04 is activated by a signal from the control device, and the gear 2 begins to fall, and at the point in time when the base plate 1 passes directly under the dropping device 4 in Figure c,
The gear 2 reaches the base plate 1 and is loosely fitted onto the gear shaft 5 implanted in the base plate 1. During this time, the base plate 1 is transported at a constant speed without stopping, and as shown in figure d, the dropping device! 54 rises to prepare for the next cycle. FIG. 2 shows an embodiment of the dropping device 4, in which an elastic material 1 such as rubber is fixed to the lower edge of a cylindrical chucking head 6 that is moved up and down by an air cylinder, and a vacuum pump is installed inside. The pressure is reduced. 10
An ejection pin 8 driven by a solenoid is provided at the center of the chucking head 6, and an annular projecting wall 9 for ejecting the gear 2 in a horizontal position and a gear for positioning are provided at the lower end of the ejection pin 8. A protruding shaft 11 is formed to be inserted into the shaft hole 10 of No. 2.

Figure 3 shows the overall structure of the automatic assembly device, in which the parts are mounted on a movable frame 12 that is movable in a direction perpendicular to the direction of movement of the conveyor 3, and have a chucking head 6 that is movable up and down at the lower end. A plurality of dropping devices 4 are arranged in parallel along the conveyor 3, and each chucking head 6 sucks and holds the child parts 2 one by one from each component supply device 13 on the side of the conveyor and moves them above the conveyor 3. While being transported, the child part 2 is dropped onto a predetermined location on the parent part 1 being transported by a conveyor 3.

Each component supply device 13 includes a hopper part 14 and a chute part 15.
Therefore, the vibrator causes the child parts, that is, the gear 2
are arranged and transported to the tip stopper of the chute section 15 in a rush. A pallet 16 is fixed on the belt conveyor 3 on which the parent part, ie, the base plate 1 is fitted and placed. A head 18 for supplying the parent part 1 from the parent part supply guide 17 and a head 18 for feeding the parent part 1 from the parent part supply guide 17 and taking out the assembled product to the finished product delivery guide 19 are provided at the starting and ending ends of the six groups of chucking heads arranged in parallel. A head 20 is provided for this purpose. Reference numeral 21 denotes a photoelectric sensor for position detection, which detects the point in time when the pallet 16 passes and generates an operation timing signal for the dropping device 4 by the control device.

22 is an operation panel.

Figure 4 is an exploded view of parent and child parts 1 and 2, Figure 5 is both parts 1,
This figure shows the dimensional relationship of the unevenness of the shaft hole 1 in this example.
Although the outer diameter D of the shaft 5 is larger than the inner diameter d of the shaft 5 and has a "gap," tapers C and C2 are provided on both sides to increase the gap margin L.

That is, it is sufficient that both parts meet while the shaft 5 in the figure moves from the position shown by the solid line to the position shown by the chain line, and the timing margin is equal to L divided by the conveyor speed. The figure shows the case of a "clearance fit", but even in the case of a "tight fit", a gap margin can be provided by the taper, and the part 2 fitted to the tapered part can be later pressed with a jig etc. All you have to do is take measures. The conveyor speed is 100~2
0011/Sec is appropriate, and increasing the ejecting speed by the ejector pin 8 improves accuracy and increases the conveyor speed.

In addition, by ejecting during suction and by forming the tip of the ejector pin 8 into an annular shape, it is possible to maintain an almost horizontal posture during the fall, but as shown in FIG. By providing guidance, posture can be controlled more accurately. Figure 6 shows the control device.
A solenoid valve 24 controlled by a control circuit 23 switches the air pressure of a compressor 25 to operate an air cylinder 26 that moves the movable frame 12 up and down, thereby moving the head 6 mounted on the movable frame 12 up and down.

The ejecting pin 8 is a solenoid 2 fixed to a movable frame 12.
It is driven by 7. 31 is a vacuum pump connected to the head 6.

Although not shown, the horizontal movement of the dropping device 4 is driven by an air cylinder with the position of a stopper adjusted in advance. 29 is a throttle valve, and 30 is a solenoid valve, which is used to reduce the vacuum suction force when it is desired to reduce the falling speed of thin-walled parts or the like.

In the embodiment shown in FIG. 7, the parts supply chute 15 is connected to the dropping device 4
By connecting directly to the conveyor, the horizontal drive of the dropping device 4 is omitted, and the position of each dropping device 4 in the direction perpendicular to the running direction of the conveyor is adjusted in advance according to the assembly location of the parent part. Fixed.

In the figure, 28 is a component holder made of an elastic material. The present invention is constructed as described above, and since the tracking head 6 is formed to be able to move up and down, it can be used when the gear shaft 5 has different heights as in this embodiment, or when the gear shaft 5 is generally Even if the top surface of component 1 is uneven, the child component 2 can be dropped as close to the assembly location on the parent component 1 as possible, and the time required for dropping can be shortened, making assembly easier. This has the advantage that accuracy can be improved, and since the falling distance is shortened, there is an advantage that assembly errors due to unstable posture when the child parts are released from the head by releasing chuck can be prevented.

[Brief explanation of the drawing]

1A to 1E are side sectional views of the main parts explaining the operating principle of the present invention, FIG. 2 is a sectional view of the main parts of one embodiment, FIG. 8 is an overall perspective view of the same, and FIG. 4 is used for the same. 5 is an explanatory diagram of the operation of the same embodiment as above, FIG. 6 is a schematic system diagram of the control device as above, and FIGS. 7A and 7B are main parts showing operating states of other embodiments. FIG. 1 is the parent part, 2 is the child part, 3 is the conveyor, 4 is the dropping device, and 6 is the chucking head.

Claims (1)

[Claims] 1. In an automatic assembly device that assembles child parts by dropping them from a drop position above the conveyor onto a predetermined location on a parent part that is continuously moved horizontally by a conveyor, the child parts are dropped into the dropping device until the point where they fall. An automatic parts assembling device characterized in that a chucking head for holding is provided so as to be movable up and down, and the chucking head is provided with an ejecting pin for projecting and dropping a child part held by the chucking head.