JPS634020Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic carrier insertion device for inserting carriers into an automatic soldering device at regular intervals.

In automatic soldering equipment, when a printed circuit board held in a carrier is soldered in a soldering bath, oxides floating on the solder liquid surface are removed with a scraping plate, and the printed circuit board is immersed after the solder liquid surface is clean. soldering. However, solder that is molten at high temperatures quickly re-oxidizes even if the oxide on the surface is removed.
Oxide removal using a scraper must be performed immediately before dipping the printed circuit board. Therefore, this removal work is performed in conjunction with the movement of the printed circuit boards, and is performed between the moving boards, and this interval is such that the oxide removal work can be performed.

In general, the carrier-engaging parts of the carrier conveying device of automatic soldering equipment are installed at intervals that allow for oxide removal work, so the carriers do not travel in a connected state, but the carrier-engaging parts It is difficult to ensure that the carriers are engaged at each time, and there are often gaps between the carriers, which impairs productivity. In addition, the carrier may not engage properly and may get caught on another device while the carrier is running, destroying that device, or the carrier may fall from the transport device and damage the carrier or the printed circuit board held by the carrier. There was a fear that it would happen. Therefore, the worker must always pay close attention to the conveying device and try to properly engage the device, which is a mental pain.

The present invention was devised in view of the above-mentioned conventional drawbacks, and provides an automatic carrier insertion device in which the carrier is always properly engaged with the conveying device at regular intervals even if the operator does not monitor the conveying device. It is.

In the automatic soldering device to which the present invention is applied, the conveying device is composed of a pair of conveyor chains and a carrier engagement shaft installed between the conveyor chains, and the conveyor chain is raised at the carrier insertion portion. Further, the carrier used has a groove carved in the front part thereof so that the carrier can be engaged with the carrier engagement shaft.

The present invention will be explained below based on the drawings. FIG. 1 is a side view for explaining the present invention, and FIG. 2 is a plan view thereof. One end of the carrier standby rail 1 is rotatably supported by a shaft, and a lower part near the other end is supported by a vertical movement device 2. The vertical movement device consists of a "dog"-shaped cam 4 and an air cylinder 5 operated by a solenoid valve V. A limit switch 3 installed in the middle of the travel path of the transport device is linked to the solenoid valve V of the air cylinder mentioned above, and operates the solenoid valve by using a change detected by the limit switch as an electric signal. The conveyance device is equipped with a pair of conveyor chains 6, 6 and a gear 7 for changing the direction of the conveyor chains, and between the pair of conveyor chains are carrier engagement shafts 8, 8...
is installed. The carrier engagement shaft engages with and places an engagement groove 10 provided at the front of the carrier 9 and a mounting portion 11 provided at the rear of the carrier 9, thereby causing the carrier to travel in the direction of arrow A. An operating pin 12 for operating the limit switch 3 is installed on the side of the engagement shaft that engages with the engagement groove of the carrier, and the operating pin sequentially pushes the limit switch 3 as the conveyor chain moves. Further, at the front upper part of the carrier standby rail 1, there is a stopper 13 for positioning the carrier. The stopper 13 positions the carrier so that the engagement groove 10 in the front part of the carrier and the engagement shaft 8 installed on the conveyor chain are vertically aligned.

Next, the operation of the automatic carrier insertion device of the present invention having the above structure will be explained.

First, the carrier 9 holding the printed circuit board P to be soldered is placed on the carrier standby rail 1 so that the front part contacts the stopper 13. At this time, the carrier standby rail is diagonally upward, that is, the top of the cam of the vertical movement device is at the top. When the conveyor chain runs and the operating pin 12 provided on the side of the conveyor chain 6 comes into contact with the limit switch 3, an electrical signal is sent to the solenoid valve V, and the valve opens and closes to move the operating rod of the air cylinder 5 in the direction B. to lower the top of the cam 4. As the cam descends, the carrier standby rail 1
It also descends to a position where it engages with the carrier engagement groove 8 provided in the conveyor chain, as shown by the dashed line. Then, the carrier engagement shaft 8 that has risen as the conveyor chain travels engages with the engagement groove 10 provided in the front part of the carrier and drags the carrier on the carrier standby, and the next engagement shaft that has further risen. The carrying section 11 at the rear of the carrier is placed on the carrier, and the carrier begins to travel. Therefore, if there are carriers on the carrier standby rail, the carriers will always be automatically inserted at regular intervals.

As explained above, the present invention allows the carrier to be inserted normally without leaving unnecessary gaps, even if the operator does not constantly monitor the conveyance device as in the past, resulting in a decrease in productivity. Furthermore, damage to the device or carrier due to unreliable engagement of the carrier is completely eliminated.

In addition, although the example uses a cam and an air cylinder for the vertical movement device of the standby rail,
Any device can be used as long as it can move up and down based on electrical signals in conjunction with a limit switch provided in the middle of the travel path. Furthermore, the present invention is fully capable of interlocking with other working devices, such as component mounting devices.

[Brief explanation of drawings]

FIG. 1 is a side view for explaining the present invention, and FIG. 2 is a plan view thereof. DESCRIPTION OF SYMBOLS 1... Carrier standby rail, 2... Vertical movement device, 3... Limit switch, 6... Conveyor chain, 8... Carrier engagement shaft, 9... Carrier, 12... Operating pin, 13... Stopper.

Claims (1)

[Scope of utility model registration request] An automatic carrier insertion device that engages a carrier whose front part is an engagement groove with a carrier engagement shaft between a pair of ascending chain conveyors of an automatic soldering device, and a standby rail on which the carrier is placed and stands by. One end is rotatably supported on a shaft, and the other end is supported by a vertical movement device. A stopper is installed at the front upper part of the standby rail to position the carrier on the standby rail, and when the carrier is positioned by the stopper, the engaging groove in the front part is moved when the vertical movement device operates. An automatic carrier insertion device characterized by having a structure that engages with an engagement shaft between conveyor chains.