JPH0643208B2 - Printed circuit board transfer device for automatic soldering equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention has been devised in an automatic soldering device so as not to hinder the transfer function of a printed circuit board even when exposed to a high ambient temperature. The present invention relates to a printed circuit board transfer device for a new automatic soldering device.

2. Description of the Related Art A device for continuously soldering a large amount of printed circuit boards by bringing a printed circuit board transported in a substantially horizontal direction by a printed circuit board transportation device into contact with a jet surface of molten solder in a solder bath is a so-called automatic soldering device. It is well known as an attachment device.

The printed circuit board carrier of such an automatic soldering device is provided with a pair of carrier chains whose relative distances are adjustable in order to adapt to the width of the printed circuit board, and the traveling path of the carrier chain has a small variable ascending slope. It is common to use a straight path of. In order to realize such a function, a pair of structural members that support one end to be able to move up and down are provided, and while a series of equipment such as a fluxer and a preliminary heater is attached to the structural members, a pair of structural members are provided inside the structural member. It is usual that a guide member is provided, the transport chain is run along the guide member, and an appropriate width adjusting mechanism is provided in order to adjust the relative distance between the guide members.

This is capable of varying the gradient of the conveyance path of the printed circuit board by raising and lowering one end of each of the structural member and the guide member at the same time, while moving at least one of the guide members in parallel, The relative spacing can be adjusted to accommodate variations in the size of printed circuit boards to be transported.

Problems to be Solved by the Invention According to the related art, when the structural member and the guide member are exposed to a high ambient temperature, a dimensional error occurs due to thermal expansion, which may hinder the transfer function of the printed circuit board. There was a problem that there is. That is, in general,
The former uses an iron-based material for the structural member and the guide member, while the latter uses an aluminum-based material, so a preliminary heater, a molten solder bath, etc., which are arranged along the conveyance path of the printed circuit board. When exposed to a high ambient temperature due to the heat source of, the dimensional difference due to the thermal expansion of both appears significantly,
As a result, the guide member may bend, and it may not be possible to properly maintain the relative distance between the transport chains.

Therefore, in view of the problems of the prior art, an object of the present invention is to support one end of a guide member so as to be slidable in the longitudinal direction, so that the guide member may bend even if exposed to a high atmospheric temperature, or a printed circuit board may be exposed. Another object of the present invention is to provide a printed circuit board transfer device for an automatic soldering device, which can effectively eliminate the risk of the transfer failure.

Means for Solving the Problems The structure of the present invention for achieving the above object is to provide a pair of structural members having one end movably supported by an inlet side guide shaft and an outlet side guide shaft, and an inner side of the structural member, A pair of guide members that are arranged at both ends of the structural member so that the relative spacing between them can be adjusted by supporting one side in parallel with the other through an inlet side guide shaft and an outlet side guide shaft, and a guide. The guide member is provided with a pair of transport chains with a transport hook that travels while being guided by the member. One end of the guide member moves up and down integrally with the structural member, and one end of the guide member is slidably supported in the longitudinal direction via the slide base. What is done is the summary.

Operation According to the structure of the invention, if the relative distance between the guide members is appropriately set and the carrier chain is made to travel, the carrier chain holds the printed circuit board via the carrier hook and carries it. On the other hand, the transport path can be arbitrarily set by raising and lowering one end of the structural member and raising and lowering one end of the guide member.

Further, since one end of the guide member is slidably supported in the longitudinal direction, even if a dimensional difference due to thermal expansion occurs between the guide member and the structural member due to exposure to a high atmospheric temperature, This dimensional difference can be easily absorbed. This is because the guide member is expandable and contractable in the longitudinal direction, and both ends are not constrained by the structural member.

Example Hereinafter, an example will be described with reference to the drawings.

The printed circuit board transporting device of the automatic soldering device includes a pair of structural members 11, 11, a pair of guide members 12, 12, and a pair of transport chains 13, 13 running along the guide members 12, 12 as main members. (Figs. 1 and 2
Figure).

The structural members 11 and 11 are rectangular pipe-shaped long members made of an iron-based material and arranged in parallel with the longitudinal direction of a machine frame (not shown), and both ends thereof are the first base member 1
It is supported by an inlet side guide shaft 14 and an outlet side guide shaft 15 via 1a, 11b, 11c and 11d. However, the structural members 11 and 11 are assumed to have necessary and sufficient mechanical strength, and a series of required equipment such as a fluxer and a preliminary heater (not shown) are attached in the middle thereof,
In addition, a molten solder bath (not shown) is provided at a lower position near the end portion on the outlet side.

The inlet side guide shaft 14 is rotatably supported by a machine frame (not shown) via bearing brackets 14a, 14a and bearings 14b, 14b. Further, the outlet side guide shaft 15 is rotatably inserted at both ends of the link members 37, 37 of the gradient adjusting mechanism 30 and supported, and is arranged in parallel with the inlet side guide shaft 14.

The guide members 12 and 12 are elongated drawn members having a substantially T-shaped cross section and arranged in parallel with each other inside the structural members 11 and 11, and the material thereof is an aluminum-based material. . Both ends of the guide members 12, 12 are
Through the base members 12a, 12a, 12b, 12b of
It is supported by the inlet side guide shaft 14 and the outlet side guide shaft 15. However, the second base member 12 on the inlet side
On the upper surfaces of a and 12a, the slider 16a and the base 16b
The slide bases 16 and 16 formed by a combination of the above are mounted, and each slide base 16 is interposed between the guide member 12 and the second base member 12a. Also, the first
The guide member 1 on the left side when viewed in the direction of arrow A in FIGS.
The second base members 12a and 12b corresponding to No. 2 are slidable in the axial direction of the inlet side guide shaft 14 and the outlet side guide shaft 15, respectively, and the second base members 12a and 12b corresponding to the other guide member 12 are provided. The base members 12a and 12b are immovably attached to the guide shafts 14 and 15, respectively.

An endless double chain 13a forming the transport chain 13 runs along the upper side of each guide member 12. That is, the brackets 13 are provided at both ends of the guide member 12.
The sprockets 13c and 13c are axially mounted via the b and 13b, and the double chain 13a includes the sprocket 13
It is wrapped around c and 13c. A large number of L-shaped transport hooks 13d, 13d ... Are hung vertically over the entire length of the double chain 13a. However, it is assumed that the sprocket 13c on the inlet side is a driven sprocket and the sprocket 13c on the outlet side is a drive sprocket. Has become. Further, the pair of transport chains 13 and 13 guided by the pair of guide members 12 and 12 have the transport hooks 13 in the same plane.
The tips of d, 13d, ... Are opposed to each other, and the printed circuit board PC can be held between them and conveyed in the direction of arrow A in FIGS.

A pair of covers 12c, 12c is provided on the upper surface of the guide member 12 so as to cover the double chain 13a. Further, another cover 13e is provided corresponding to each sprocket 13c.

The sprockets 13c, 13c on the outlet side are the shafts 13
f and 13f are extended downwardly, and bevel gears 13g and 13g are attached to their shaft ends. On the other hand, the first
Part of the base members 11c and 11d of the
A drive shaft 13j parallel to the outlet side guide shaft 15 is pivotally supported. The bevel gears 13g and 13g mesh with the bevel gears 13h and 13h on the drive shaft 13j, and the drive shaft 13j passes through the chain 13k and the conveyor motor 13m.
Are linked to. In addition, each bevel gear 13g, 13h
Are housed in a gear box formed in a part of the second base member 12b. Therefore, the outlet side guide shaft 1
5, the bevel gear 13h in the second base member 12b, which is slidable in the axial direction, can move in the axial direction of the drive shaft 13j while maintaining meshing with the corresponding bevel gear 13g.

One guide member 12 can move in parallel to the other guide member 12 via the width adjusting mechanism 20.
The width adjusting mechanism 20 includes a width adjusting motor 21 attached to the side end surface on the inlet side of one of the structural members 11, a ball screw shaft 22 parallel to the inlet side guide shaft 14, and a outlet side guide shaft 15. The ball screw shaft 23 serves as a main member.

Both ends of the ball screw shafts 22 and 23 are axially supported by the inlet-side first base members 11a and 11b and the outlet-side first base members 11c and 11d, respectively, and one end of each is It is connected to the bevel gear devices 22a and 23a incorporated in the first base members 11b and 11d. On the other hand, the bevel gear devices 22a and 23a are driven by the connecting shaft 21b parallel to the structural member 11,
The connecting shaft 21b is connected to the width adjusting motor 21 via the timing belt 21a. Also, the ball screw shaft 2
Traversing members 22b and 23b are screwed to the same positions at the intermediate portions of the traversing members 22b and 23, respectively.
b is connected to the second base members 12a and 12b on the side that slides in the axial direction of the guide shafts 14 and 15 via plate-shaped brackets 22c and 23c, respectively.

The gradient adjusting mechanism 30 includes a gradient adjusting motor 31 and a connecting shaft 3.
2, a bevel gear device 33, 33, a trapezoidal screw shaft 34,
34, first elevating members 35, 35, second elevating members 36, 36, and the link members 37, 37 described above.

A sprocket 31a is fixed to the shaft end of the gradient adjusting motor 31, and a conduction chain 31b is wound between the sprocket 31a and the sprocket 32a fixed to the connecting shaft 32. At both ends of the connecting shaft 32,
The bevel gear devices 33, 33 are mounted, and the trapezoidal screw shafts 34, 34 are rotatably provided on the upper surfaces of the bevel gear devices 33, 33.

Each of the upper ends of the trapezoidal screw shafts 34, 34 has a bearing 34a,
It is assumed that the trapezoidal screw shafts 34, 34 are pivotally supported by a machine frame (not shown) via the bracket 34b.
Are arranged parallel to each other.

A first elevating member 35 and a second elevating member 36 are screwed onto each trapezoidal screw shaft 34.
Reference numerals 35, 36 and 36 denote the corresponding trapezoidal screw shafts 3, respectively.
It is assumed that the screws 4 and 34 are screwed at the same height position. The first elevating members 35, 35 are connected beams 35a.
The transport motor 13m is mounted on the upper surface of the coupling beam 35a. On the other hand, the link member 37 is swingably suspended on the second elevating members 36, 36 via the link pin 37a, and both ends of the outlet side guide shaft 15 are, as described above, linked. Member 3
7 and 37 are rotatably inserted.

The printed circuit board carrying device of the automatic soldering device having such a configuration operates as follows.

First, the transport chains 13 and 13 running along the guide members 12 and 12 are adjusted in relative distance via the width adjusting mechanism 20 to be adapted to the printed circuit board PC to be transported. That is, when the width adjusting motor 21 is driven, the connecting shaft 21b
Since the rotating shaft rotates, the connecting shaft 21b is connected to the bevel gear device 22.
The ball screw shafts 22 and 23 can be simultaneously rotationally driven via a and 23a. Therefore, the traverse members 22b, 2
3b moves in the axial direction of the ball screw shafts 22 and 23 and corresponds to the one guide member 12 and the second base member 12
a and 12b are the inlet side guide shaft 14 and the outlet side guide shaft 1.
5 can be moved in the axial direction, and the guide member 12
Can move parallel to the other guide member 12. That is, the guide members 12, 12 are the inlet side guide shafts 14, which are arranged at both ends of the structural members 11, 11.
The outlet-side guide shaft 15 is provided so that the relative distance between the guide chains 13 and 13 can be adjusted. By setting the relative distance between the guide members 12 and 12, the transport chains 13 and 13 realize a predetermined arbitrary relative distance. can do.

The bevel gear units 22a and 23a have the same gear ratio and the ball screw shafts 22 and 23 have the same screw pitch. At this time, if the rotation amount of one of the ball screw shafts 22 and 23 is detected by a rotary encoder (not shown), the relative distance between the transport chains 13 and 13 can be detected and displayed as a digital amount.

The conveyance path of the printed circuit board PC by the conveyance chains 13 and 13 is provided with a gradient adjusting mechanism 30 via a gradient adjusting motor 31.
The gradient is adjusted and set by driving. That is, the gradient adjusting motor 31 is operated by the bevel gear devices 33, 3
Since the trapezoidal screw shafts 34, 34 are rotationally driven via 3,
The trapezoidal screw shafts 34, 34 can move the second elevating members 36, 36 up and down at the same time. On the other hand, since the outlet side guide shaft 15 is supported by the second elevating members 36, 36 via the link members 37, 37, if the second elevating members 36, 36 ascend and descend, the outlet side guide shaft 15 Structural members 11, 11 supported by the guide member 1
One end of each of the outlets 2 and 12 on the outlet side can be raised and lowered by swinging up and down around the inlet-side guide shaft 14, and the gradient adjusting mechanism 30 causes the gradient θ of the transport path by the transport chains 13 and 13. Can be set arbitrarily (3rd
Figure).

That is, the structural members 11 and 11 have the inlet side guide shaft 1
4. One end on the outlet side is movably supported by the outlet-side guide shaft 15, and the guide members 12, 12 can move up and down integrally with the structural members 11, 11 at the one end on the outlet side. The structural members 11, 11, the guide members 12, 1
When the gradient adjusting mechanism 30 is driven, the distal end of 2 draws an arc centered on the inlet side guide shaft 14, but the second elevating members 36, 36 and the outlet side guide shaft 15 are linked members. Since they are connected via 37, 37, these members can be smoothly moved up and down.

In this way, when the gradient θ of the transport path is changed,
The first elevating members 35, 35 are also simultaneously raised and lowered by the trapezoidal screw shafts 34, 34. Therefore, the transport motor 13
m also goes up and down at the same time, and the conveyance motor 13m and the drive shaft 13j
The relative positional relationship with is unchanged. Therefore, the transport motor 1
3m is a drive shaft 13j, bevel gears 13h, 13h, 1
3g, 13g, shafts 13f, 13f, sprocket 13
The transport chains 13 and 13 can be always driven in a predetermined direction via the c and 13c.

When the structural members 11, 11 and the guide members 12, 12 are exposed to a high temperature atmosphere, thermal expansion occurs in the longitudinal direction of these members. At this time, since the structural members 11 and 11 are supported by the inlet side guide shaft 14 and the outlet side guide shaft 15 via the first base members 11a, 11b, 11c, and 11d, the expansion and contraction of the structural members 11 and 11 is prevented by both guide shafts. It acts to vary the mutual distance between 14 and 15. However, the outlet side guide shaft 15 is not connected to the second guide shaft via the link members 37, 37.
Since the structural members 11 and 11 are extended and contracted by the link members 37 and 3,
7 can be absorbed by swinging around the link pins 37a, 37a.

On the other hand, one end on the outlet side of the guide members 12, 12 is fixed to the second base members 12b, 12b, but one end on the inlet side is connected to the second base member 12a via the slide bases 16, 16. It is supported by 12a. Therefore, the expansion and contraction of the guide members 12 and 12 is performed by the slide base 1.
The sliders 16a and 16a of 6 and 16 can be absorbed by sliding. That is, the guide members 12, 12
Has its one end on the inlet side slidably supported in the longitudinal direction, and therefore is not affected by its expansion and contraction.

Here, the second base members 12a and 12a are supported by the inlet side guide shaft 14, and the second base members 12b and 12b are supported by the outlet side guide shaft 15, and both guide shafts are supported. The distance between 14 and 15 is affected by the expansion and contraction of the structural members 11 and 11. Therefore, the sliding of the sliders 16a and 16a on the slide bases 16 and 16 corresponds to the difference in expansion and contraction between the structural members 11 and 11 and the guide members 12 and 12, that is, the difference in thermal expansion.

In the above description, the slide base 16 can effectively use the linear bearing mechanism known by the trade name of the LM guide, but this slide base 17 is formed by combining a general slide bearing 17a and a slide shaft 17b. (Fig. 4). However, here, the clamp members 17c and 17c are fitted to both ends of the slide shaft 17b,
The guide member 12 is supported via a base plate 17d screwed to the upper surface thereof. In addition, the sliding bearing 17
The a is integrated in an orthogonal state to the cylindrical second base member 12a that is slidable in the axial direction of the inlet side guide shaft 14.

Further, the slide bases 16, 16, 17, 17 may be interposed between the second base members 12b, 12b at one end of the guide members 12, 12 on the outlet side. That is, the guide members 12 and 12 may support one ends of the guide members 12 and 12 so as to be slidable in the longitudinal direction.

Further, the structural members 11, 11, the guide members 12, 12
May be any materials other than iron-based materials and aluminum-based materials.

EFFECTS OF THE INVENTION As described above, according to the present invention, a pair of structural members having one end movably supported, and one end integrally movable up and down and one end movably supported in the longitudinal direction. By providing the pair of guide members and the pair of transport chains that are guided by the guide members to travel, the guide member can effectively absorb the difference in thermal expansion caused by the difference in the constituent material from the structural member. Therefore, even if the guide member is exposed to a high temperature atmosphere, it is possible to completely eliminate the possibility that the guide member may be bent and the conveyance function of the printed circuit board may be hindered.

[Brief description of drawings]

FIGS. 1 to 3 show an embodiment, FIGS. 1 and 2 are perspective views showing the construction of the main parts on the inlet side and the outlet side, respectively, and FIG. 3 is an operation explanatory view of the gradient adjusting mechanism. FIG. 4 is a perspective view of a main part showing another embodiment. 11 …… Structural member 12 …… Guide member 13 …… Conveying chain 13d …… Conveying hook 14 …… Inlet side guide shaft 15 …… Outlet side guide shaft 16, 17 …… Slide base

Claims (1)

[Claims] 1. A pair of structural members having one end movably supported by an inlet side guide shaft and an outlet side guide shaft, and the inlet side guide shafts disposed inside the structural member at both ends of the structural member. A pair of guide members, which are arranged so that their relative distances can be adjusted by supporting one of them in parallel with respect to the other through an outlet-side guide shaft, and a pair of carrying hooks that are guided by the guide members to travel. The automatic soldering device, characterized in that one end of the guide member moves up and down integrally with the structural member, and the other end is slidably supported in the longitudinal direction via a slide base. Printed circuit board transfer device.