JPS6116919Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a conveying device for a carrier for a printed circuit board, which conveys the soldering device by changing the conveying speed only in a certain section.

Conventionally, there are various types of conveyance devices in which a carrier carrying a printed circuit board is driven by a conveyance chain, and the traveling speed of the carrier is increased only in the soldering area in the solder bath.
All of them had complicated mechanisms and were often expensive.

This invention was developed in consideration of the above points, and includes a high-speed conveyance chain in addition to the main conveyance chain where the carrier travels, and changes the carrier from engagement with the main conveyance chain to engagement with the high-speed conveyance chain, or Conversely, the traveling speed of the carrier can be easily changed by automatically switching engagement from the high-speed conveyance chain to the main conveyance chain. This idea will be explained below.

1 to 6 are a plan view, a side view, a partial perspective view, and an explanatory view showing one embodiment of this invention.

First, in FIGS. 1 to 3, 1 is a carrier, 2 is a frame, and a printed circuit board 4 is removably mounted on a lower board holder 3. Reference numeral 5 indicates wheels attached to both sides of the frame 2, 6 a locking device fixed to one side of the frame 2, 7 a rail for conveyance, and 8 the carrier 1 as shown by the arrow in FIG. It is an endless main conveyance chain that conveys in the A direction, and fixing plates 9 are integrally attached at predetermined intervals. A locking piece 12 is attached to the fixed plate 9 via a hinge 11 having a spring 10 biased clockwise (in the direction of arrow B in FIG. 3). Reference numeral 13 denotes an engagement groove that engages with the locking tool 6 of the carrier 1, and has an open end on the side in the direction in which the carrier 1 moves. 14 is a sprocket of the main conveyance chain 8, and 15 is a pair of high-speed conveyance chains, which are formed in an endless shape and are provided on both sides of the upper part of the solder bath 16, and whose running speed is faster than that of the main conveyance chain 8. . Numeral 17 is a locking piece that is integrally attached to the high-speed conveyance chain 15 at predetermined intervals and engages with the inner side 2a of the frame 2 on the front side of the carrier 1 in the running direction. 18 is a sprocket of the high-speed conveyance chain 15, 19 is a movable guide for rotating the locking piece 12 from the inclined position shown by the dotted line in FIG. 3 to the horizontal position shown by the solid line, the details of which are shown in FIG. is a fixed guide, the details of which are shown in FIG.

In FIG. 5, when the locking piece 12 advances from the position shown by the dotted line and reaches a predetermined position, when the movable guide 19 is pushed out from the position shown by the dotted line to the position shown by the solid line by the driving device 21 such as a piston, this As the locking piece 12 is pushed out, the locking piece 12 rotates from the inclined position to the horizontal position shown by the solid line, and in this state, the locking piece 12 further advances so that its engagement groove 13 engages with the locking tool 6 of the carrier 1. The state is shown in FIG.

In FIG. 6, the fixed guide 20 has a curved shape so that the locking piece 12 is gradually rotated from the inclined position shown by the dotted line in FIG. 3 to the horizontal position shown by the solid line as the carrier 1 advances.

Next, the operation will be explained.

A printed circuit board 4 is mounted on the basic holder 3 of the carrier 1. At this time, Carrier 1 is still stationary. Next, the fixed plate 9 is moved to the first
Proceed in the direction of arrow A in Figure 2. At this time, the fifth
As shown in the figure, the movable guide 19 is connected to the drive device 21.
As the locking piece 12 in the inclined position moves from the dotted line position to the solid line position due to the drive of
5) is guided by the movable guide 19 and rotates counterclockwise (in the direction opposite to arrow B in FIG. 3) against the biasing force of the spring 10, and reaches a horizontal position, where it is engaged. After the fitting groove 13 is engaged with the stopper 6 of the stopped carrier 1, the stopper 6 is moved as shown in FIG.
By pushing in the direction of arrow A in Figure 2, the carrier 1
transport. At this time, even if the locking piece 12 attempts to rotate clockwise (in the direction of arrow B in FIG. 3) due to the restoring force of the spring 10, it will not come off because it is held down by the stopper 6a of the locking tool 6. The carrier 1 passes through a flux coating device and a preheating device before being soldered in a soldering bath 16. In the soldering bath 16, as will be described later, in order to increase the conveying speed, the carrier 1 is transferred from the main conveying chain 8 to the high speed conveying chain 1.
Move to 5. That is, after the carrier 1 has passed through the preheating device, the locking pieces 17 attached at required intervals are locked to the inner side 2a of the frame 2 to the high-speed conveyance chain 15 that has been raised by being engaged with the sprocket 18. Therefore, from now on, high-speed conveyance chain 1
5, the carrier 1 is transported, thereby increasing the transport speed. Therefore, the locking tool 6 of the carrier 1 separates from the engagement groove 13 at a faster speed than the locking piece 12. At this time, the locking piece 12 is rotated clockwise (in the direction of arrow B in FIG. 3) by the spring 10 to the inclined position indicated by the dotted line. In this way, all of the locking pieces 12 that are not engaged are tilted by the springs 10, so even if the carrier 1 travels at a fast conveyance speed, it cannot overtake the locking pieces 12 that are traveling at a slow speed. It will be done without any problems. Therefore, the printed circuit board 4 is transferred to the solder bath 16 at a high transfer speed by the high-speed transfer chain 15.
soldering is performed. After soldering, the high-speed conveyance chain 15 connects to the sprocket 18.
Since the locking piece 17 is disengaged from the inner side 2a of the frame 2, the carrier 1 stops at that location. A fixed guide 20 is provided at that position as shown in FIG.
The fixed guide 20 gradually moves the third
It is rotated in the direction opposite to arrow B in the figure, and becomes horizontal as shown by the solid line in Figure 3 in front of the stationary carrier 1. Therefore, the engaging groove 13 is again engaged with the locking tool 6 of the carrier 1, and the carrier 1 is transferred to the next cutting device at the running speed of the main conveyance chain 8.

Note that the above-mentioned high-speed conveyance chain 15 is not limited to the solder bath 16, but can be provided in other places where necessary. Accordingly, the fixed guides 20 can also be provided where necessary. Further, the movable guide 19 is not necessarily necessary, and the movable guide 19 may be operated manually by a person who attaches the printed circuit board 4 to the carrier 1, or the fixed guide 20 may be used.

As explained above, this invention provides an engagement groove in which the locking piece attached to the main conveyance chain has an open end on the side in the direction of movement of the carrier, while the carrier is held in an inclined position by a spring when not engaged. , a locking device is provided that takes a horizontal position with a fixed guide when engaged,
When the carrier is transported at high speed by the high-speed transport chain during transport by the main transport chain, the locking piece and the locking tool are disengaged and engaged, so the carrier shifts from the main transport chain to the high-speed transport chain. The engagement is then automatically released. Therefore, not only can the conveyance speed be switched fully automatically, but even if an unexpected force is applied to the carrier in the conveyance direction during conveyance, the carrier is easily disengaged and damage is prevented. Moreover, it has advantages such as simple structure, reliable operation, and low cost.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the overall outline of an embodiment of this invention, Fig. 2 is a plan view showing the main parts enlarged, Fig. 3 is a side view of Fig. 2, and Fig. 4 is A partial perspective view, FIG. 5 is an explanatory diagram showing the operation of the locking piece and the movable guide, and FIG. 6 is an explanatory view showing the operation of the locking piece by the fixed guide. In the figure, 1 is a carrier, 2 is a frame, 3 is a board holder, 4 is a printed circuit board, 5 is a wheel, 6 is a locking tool,
7 is a rail, 8 is a main conveyance chain, 9 is a fixed plate,
10 is a spring, 11 is a hinge, 12 is a locking piece, 13 is an engagement groove, 14 and 18 are sprockets, 15 is a high-speed conveyance chain, 16 is a solder bath, 17 is a locking piece,
19 is a movable guide, and 20 is a fixed guide.

Claims (1)

[Scope of utility model registration request] A carrier on which a printed circuit board is removably installed is provided with a locking tool, and has an engagement groove in which the carrier is engaged and disengaged, and the advancing direction side of the carrier becomes a closed end, and is held in an inclined position by a spring. rotatable locking pieces are attached to the main conveyance chain at predetermined intervals, and a high-speed conveyance chain is provided that travels at a higher speed than the main conveyance chain and conveys the carrier only over a predetermined distance; A moving guide or a fixed guide is provided for moving the locking piece from the inclined position to a horizontal position at the conveyance end of the high-speed conveyance chain so that the locking piece and the locking tool engage with each other. A transport device for carriers for printed circuit boards.