JPH058468Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a conveying chain for introducing a ceramic substrate printed with a thick film paste into a baking furnace.

[Prior art] A thick film circuit wiring board using a ceramic substrate is
Printed circuits are formed by the so-called thick film method. That is, a method of printing a thick film paste such as a conductive paste or a resistive paste on one or both sides of a ceramic substrate obtained by firing a green sheet, and then introducing this into a baking furnace and baking the paste. Manufactured in

In this case, a so-called mesh belt having a metal mesh part is used as a transport means for introducing the ceramic substrate printed with the thick film paste into the baking furnace, and one side of the ceramic substrate is placed on the mesh part and transported. Measures are being taken.

[Problems to be solved by the invention] However, such conventional conveying means have the following problems.

First, because one side of the ceramic substrate comes into contact with the metal mesh belt, the ceramic substrate and the thick film paste printed on it may become contaminated with or react with the oxides of the metals forming the mesh belt, causing conductors and resistors. Electrical properties of the body etc. change easily.

Second, since the ceramic substrates are placed flatly on the mesh belt, there is a limit to the number of ceramic substrates that can be stacked per unit area of the mesh belt. For this reason, the number of ceramic substrates that can be baked per unit time in the baking furnace is inevitably small, making it impossible to obtain high productivity.

Thirdly, the side of the ceramic substrate that is in contact with the mesh belt is susceptible to the effects of the mesh belt, such as heat being taken away by the mesh belt or poor heat circulation. For this reason, the baked state tends to be uneven, or the baked state tends to be different from the other side that is not in contact with anything, and it is difficult to print evenly over both sides.

This invention was made in order to solve the above-mentioned problems in conventional conveying means.

[Means for Solving the Problem] The structure of this invention will be explained with reference to the reference numerals in the drawings. The printing conveyance chain according to this invention includes first connecting elements 11 made of metal and arranged in the longitudinal direction. , a second connecting element made of metal whose both ends are rotatably connected to both ends of the adjacent first connecting element 11; substrate supporting grooves 16 are formed at regular intervals on the upper side; The second connecting element 12 has a substrate supporting element 15 supported at least on both ends thereof, and the substrate supporting element 15 has a first connecting element 12 fixedly supported in the longitudinal direction of the second connecting element 12. The second connecting element 12 is supported by the supporting part and a second supporting part supported movably in the longitudinal direction of the connecting element 12.

[Function] The conveyance chain has first connecting elements 11 arranged in the longitudinal direction, and second connecting elements 12 whose both ends are rotatably connected to both ends of the adjacent first connecting element 11. A chain is constructed. A substrate support element 15 made of ceramic, in which substrate support grooves 16, 16 for supporting the substrate are formed at regular intervals on the upper side, is attached to the second support element 12 with a first support part and a second support part. the first support element is fixed to the second support element 12 in its longitudinal direction;
The second support element 12 is movable relative to the second support element 12 in its longitudinal direction. For this reason, the load accompanying the running of the chain is absorbed by the metal connecting elements 11, which are the elements that constitute the chain.
12, and almost no addition to the fragile substrate support element 15, which is supported solely by the first and second supports on the second support element 12. Further, the difference in thermal expansion between the metal second connecting element 12 and the ceramic substrate support element 15 due to temperature changes between room temperature and high temperature during baking can be escaped by the second support part. , no thermal stress is generated in the substrate support element 15 either.

[Example] Next, an example of the present invention will be described with reference to the drawings.

As already mentioned, the chain according to the present invention is
Metal first connecting element 11 and second connecting element 1
2 are alternately connected to form a chain,
Further, a substrate support element 15 made of ceramic is supported on the second connection element 12.

The illustrated first connecting element 11 is made of a channel-shaped metal member, and its side plates 17, 17 are provided with through holes 19 in the front and rear into which the shaft pins 18 are fitted. Corresponding arc-shaped convex portions and concave portions are formed at the front and rear of the upper surface, and the front and rear first connecting elements 11 arranged in the longitudinal direction are fitted in and connected in the convex portions and concave portions.

The second connecting element 12 is made of a metal link-like member provided with a through hole 20 at both ends into which the shaft pin 18 is fitted, and two of them form a set to form the first connecting element 1.
1, and both ends thereof are pivotally connected to opposite end sides of the adjacent first connecting element 11 via a shaft pin 18, so that the adjacent first connecting element 11 can be freely bent. Link. In addition, the shaft pin 18
is made of metal and is prevented from coming off with a pin 21 or the like.

The substrate support element 15 is made of ceramic and has a plate shape, and has saw blade-like irregularities formed at regular intervals on its upper side, and the concave portions serve as substrate support grooves 16.
This substrate support element 15 is connected to the second connection element 1
A first support part fixedly supported in the longitudinal direction of the connecting element 12 and a second supporting part supported movably in the longitudinal direction of the connecting element 12 are supported by the second connecting element. Ru. That is, two through holes 22 and 23 into which the shaft pins 18 are fitted are formed in parallel in the longitudinal direction of the substrate support element 15 at both ends thereof, and one of these holes serves as the first support part. The through hole 22 has a circular shape corresponding to the diameter of the shaft pin 18, whereas the other through hole 23, which serves as the second support part, has a circular shape corresponding to the diameter of the shaft pin 18.
The hole has a width corresponding to the diameter of the coaxial pin 18 and is long in the longitudinal direction of the substrate support element 15 .

In this embodiment, the substrate support element 15 is arranged between the first connecting element 11 and the second connecting element 12;
and are arranged alternately on the outside of the second connecting element 12, and the shaft pins 18 fitted into the through holes 20 at both ends of the connecting element 12 are fitted into the through holes 22 and 23, respectively, for connection. Therefore, the substrate support element 15
is the first support part on the side of the through hole 22 and the first connecting element 1
1 and the shaft pin 1 fitted into the second connecting element 12
8, but is freely movable in the longitudinal direction with respect to the shaft pin 18 at the second support portion on the elongated hole 23 side. That is, the substrate support element 1
5 is supported in a fixed state so as not to move in the longitudinal direction with respect to the second connecting element 12 at the first support part on the side of the through hole 22, but in the second support part on the side of the elongated hole 23. is supported so as to be movable in the longitudinal direction of the second connecting element 12.

This chain is connected to an appropriate length and run from a sprocket, as shown in FIGS. 2 to 5. Then, the lower end of the substrate a is fitted into the substrate support groove 16, and the substrate a is transported in an upright state. Note that, generally, two left and right chains are used in parallel.

FIG. 6 shows another embodiment of the first and second supports supporting the substrate support element 15 to the second coupling element 12.

In the same figure a, long holes 23 are provided at both ends of the board support element 15 to serve as second support parts, a vertical groove 24 is provided in the middle to serve as the first support part, and the shaft pin 18 is fitted into the long holes 23. , a pin 25 protruding from the intermediate portion of the connecting element 12 is fitted into the vertical groove 24. In this case, the board support element 15 is fixed to the connecting elements 11 and 12 so as not to move in the longitudinal direction of the chain by fitting the pin 25 constituting the first support part into the vertical groove 24. The second connecting element 12 is supported so as to be movable in the longitudinal direction by second support portions on the side of the elongated hole 23 at both ends.

Furthermore, in FIG. 6b, a long protrusion 26 is provided protruding from the side surface of the substrate support element 15 in the longitudinal direction, instead of the second support portion formed by the elongated hole 23 and the shaft pin 18 shown in FIG. , a long groove 27 is formed from the side surface of the second connecting element 12 in its longitudinal direction. By slidably fitting these protrusions 26 and grooves 27, the structure is such that one end of the substrate support element 15 is movably supported in the longitudinal direction of the second connecting element 12.

[Effects of the invention] As explained above, according to this invention, the ceramic substrate a is placed in the substrate support groove 16 of the substrate support element 15.
Since it can be transported in an upright state, more ceramic substrates a can be transported per unit surface area, and the storage density of the baking furnace can be increased. In addition, since only the lower edge of the ceramic substrate a contacts the ceramic substrate support element 15 and most of its both sides do not touch anything, both sides can be baked evenly in the baking oven, and both sides can be baked evenly in the baking furnace. It is possible to completely prevent staining and deterioration of ceramic bases and conductors.

Furthermore, the main load required for traveling is received by the first connecting element 11 and the second connecting element 12, which are connected to each other and which substantially constitute a chain, and the substrate supporting element 15 made of ceramic receives these loads. The structure is designed to not only receive loads but also almost no thermal stress due to temperature changes, resulting in overall high strength and durability.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a chain showing an embodiment of the present invention, Fig. 2 is a plan view of the chain, Fig. 3 is a side view of the chain, and Fig. 4 is a cross section taken along line A-A in Fig. 3. Figure 5 is a side view of the same chain in use,
FIG. 6 is an exploded perspective view showing each embodiment of the connection means between the connection element and the substrate support element. DESCRIPTION OF SYMBOLS 11...First connection element, 12...Second connection element, 15...Substrate support element, 16...Substrate support groove.

Claims (1)

[Scope of utility model registration request] In a conveyance chain for introducing ceramic substrates into a baking furnace, first connecting elements 11 made of metal are arranged in the longitudinal direction, and both ends are rotatably connected to both ends of the adjacent first connecting elements 11. and a substrate support element 15 having substrate support grooves 16 formed at regular intervals on the upper side and supported by the second connection element 12 at least on both ends thereof. and the substrate support element 15
The first support part is fixedly supported in the longitudinal direction of the second connecting element 12, and the second support part is supported movably in the longitudinal direction of the second connecting element 12. A conveyance chain for printing ceramic substrates, characterized in that it is supported by a connecting element 12 of.