JPS5852780B2 - Wheel train automatic assembly device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-speed automatic assembly device for a wheel train used in watches and timers.

Conventional automatic assembly devices of this type stop the conveyor conveying the parent part 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 due to pitch errors, backlash, etc. of the conveyor device became a problem, and there were disadvantages in that the device became expensive to improve accuracy 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 explained in detail below using examples.

FIG. 1 is a detailed explanation of the present invention, in which the main plate 1 of the movement is used as the parent part, the gear 2 is used as the child part, and both parts 1 and 2 are assembled.

In figure a, the base plate 1 is conveyed horizontally to the right in the figure by a conveyor 3, and the gear 2 is held by a dropping device 4 and lowered to a predetermined position, where it stands still in the state shown in figure b.

When the main plate 1 reaches position C, the dropping device 4 is activated by a signal from the control device and the gear 2 starts to fall, and at the point when the main plate 1 passes directly under the dropping device 4 in figure d. The gear 2 reaches the base plate 1 and the gear shaft 5 is installed on the base plate 1.
It is loosely fitted into.

During this time, the base plate 1 is transported at a constant speed without stopping, and e
In the figure, the drop device 4 is raised to prepare for the next cycle.

As shown in FIG. 2, the dropping device 4 has an elastic material 7 such as rubber fixed to the lower edge of a cylindrical suction head 6 that is moved up and down by a piston cylinder, and the inside is depressurized by a vacuum pump. .

An ejector pin 8 driven by a solenoid is provided at the center of the head 6, and at the lower end of the ejector pin 8 there is an annular projecting wall 9 for ejecting the gear 2 in a horizontal state and a shaft hole 10 for positioning the gear 20. A protruding shaft 11 is formed to be inserted into.

FIG. 3 shows the overall structure of the automatic assembly device, in which a dropping device 4 is attached to a movable frame 12 that is movable in a direction perpendicular to the direction of movement of the conveyor 3, and has a suction head 6 that is movable up and down at the lower end. A plurality of these are arranged in parallel along the conveyor 3, and each suction head 6 sucks and holds child parts 2 such as gears one by one from each component supply device 13 on the side of the conveyor.
The child parts 2 are transported upwards and dropped onto a predetermined location on the base plate 1 which is being transported by a conveyor 3.

Each component supply device 13 consists of a hopper portion 14 and a guide groove portion 15, and is configured to arrange gears 2 using a vibrator and transfer them to a stopper at the end of the guide groove portion 15 in rapid succession.

A pallet 16 on which the base plate 1 is fitted and placed is fixed on the belt conveyor 3.

A suction head 18 for supplying the parent component 1 from the parent component supply guide 17 and a suction head 18 for taking out the assembled product to the finished product delivery guide 19 are provided at the start and end ends of the group of 6 suction heads arranged in parallel, respectively. A suction head 20 is provided.

Reference numeral 21 denotes a photoelectric sensor for position detection, which detects the point in time when the pallet 16 passes and generates an activation timing signal for the dropping device 4 by the control device.

22 is an operation panel. Fig. 4 is an exploded view of the gear train, and Fig. 5 shows the dimensional relationship between the unevenness of both parts 1 and 2. In this example, the inner diameter of the shaft hole 10 is larger than the outer diameter d of the shaft 5. Although there is a "gap", tapers C1 and C2 are provided on both sides to increase the gap margin.

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.

Although the figure shows the case of "clearance fit", a gap margin can be provided by the taper even in the case of "tight fit", and there is a means to press the part 2 fitted into the tapered part later with a jig or the like. All you have to do is take the following steps.

The present invention is configured as described above, and the appropriate conveyor speed is 100 to 200 mml sec, and the ejecting speed by the ejecting pin 8 is increased (the accuracy will be better and the conveyor speed will be increased). Can be done.

Furthermore, by ejecting during suction and by forming an annular protruding wall 9 on the lower end surface of the ejector pin 8, it is possible to maintain an almost horizontal posture during the fall, but as shown in FIG. By guiding the shaft hole 10, there is an advantage that the falling attitude can be controlled more accurately and positioning can be performed in the suction and holding state.

[Brief explanation of the drawing]

Figures 1a-e are side sectional views explaining the invention in detail;
FIG. 2 is a side view of essential parts of one embodiment, FIG. 3 is an overall perspective view of the same, and FIG. 4 is an exploded perspective view of the gear train assembled with the above.
FIG. 5 is an explanatory diagram of the same operation as above. 1...Main plate, 2...Gear, 3...
...Conveyor, 4...Drop device, 5...
・Gear shaft, 6... Suction head, 7...
Elastic material, 8... Ejection pin, 9...
Annular projecting wall, 10... shaft hole, 11... projecting shaft.

Claims (1)

[Claims] 1. A main plate with a plurality of gear shafts set upright is made to run continuously in the horizontal direction on a conveyor, and the gears are dropped from a dropping device arranged above the conveyor along the running direction, and the gears on the main plate are dropped through the shaft holes of the gears. In an automatic assembly device that is inserted into a shaft, the dropping device is equipped with a cylindrical vacuum suction head that attracts the top surface of the gear, and an ejector pin that moves up and down within the head, and the lower end surface of the ejector pin is attached to the lower end surface of the ejector pin when the gear is adsorbed. An automatic wheel train assembly device comprising a protruding shaft that loosely fits into a shaft hole of a gear and an annular protruding wall that abuts the upper surface of the gear.