JPS6362350B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] When constructing a platen by abutting two resin plates and thermally bonding them to a metal substrate, the area near the butt is strongly pressed against the metal substrate, and the other parts are heated by the resin plate. A platen manufacturing jig that enables high-precision bonding by pressing lightly to allow free expansion and contraction.

[Industrial application field]

The present invention relates to a jig suitable for use in manufacturing platens used in impact printing devices for various information devices.

The platen used in impact printing equipment is
The surface of the platen is easily worn due to the high-speed running of the type belt and the constant impact of the printing hammer, and the print quality deteriorates when the platen surface is worn. As a countermeasure against this problem, a platen as shown in FIG. 3 has recently been used in which a resin plate made of polyimide resin or the like having excellent wear resistance and self-lubricating properties is bonded to an iron base material.

[Conventional technology]

Conventionally, the resin plate bonded platen has been manufactured in the following manner. That is, first, a metal substrate formed from structural steel into a rectangular bar shape by machining was placed on a jig base, a thermosetting adhesive was applied to the adhesive surface of the metal substrate, and then the metal substrate was formed into a rectangular shape. Place two polyimide resin plates with their edges butted against each other.

Next, a total of five bolts are tightened from above through one elongated metal holding plate, one bolt on the end face butting line and two bolts on each side at the same interval. Finally, the metal substrate and the two resin plates are bonded by heating this in a furnace.

[Problem that the invention seeks to solve]

The problem with the conventional bonding method described above is that during heat bonding, the two resin plates, which have a larger coefficient of thermal expansion than the metal substrate, compete with each other due to thermal expansion at the center end abutting part, and as a result, one of the resin plates competes with the other due to thermal expansion. The plate moves in its longitudinal direction and hardens to adhere to the metal substrate, and when cooled, the resin plate shrinks significantly, creating a gap at the end abutting portion. This interval causes dents on the platen surface, which is a factor that impedes printing quality.

In view of the above-mentioned circumstances, the present invention aims to provide a platen manufacturing jig that can simply and easily bond the resin plates of the platen without creating a gap between the end faces of the two resin plates. be.

[Means for solving problems]

As shown in FIG. 1, the platen manufacturing jig of the present invention is a jig for placing a platen component, which is formed by providing two resin plates on a metal substrate 6 via an adhesive 7, on a lower frame portion 1a. Frame 1 and upper frame portion 1b of this jig frame 1
The two resin plates 8A, 8B are screwed together at the center of the
Three fixing bottles 3 that strongly press the abutment portion and the vicinity of both ends thereof, and adjustment bolts 4 screwed into both sides of the upper frame portion 1b of the jig frame 1, respectively.
The press plate 4 is fixed to the tip of the press plate 4 via a spring member 42, and lightly presses the two resin plates 8A and 8B.

[Effect]

That is, in the present invention, two resin plates 8A and 8B made of a resin material, for example, polyimide resin, whose coefficient of thermal expansion is four times or more larger than the metal substrate 6 made of structural steel are firmly pressed and fixed around the abutting portions. By lightly pressing the other parts with the pressing plate 2, the metal substrate 6 and the resin plates 8A and 8B are joined in an expanded state, so that they are free to expand toward both ends by heating.

After that, the metal substrate 6 and the resin plate 8 are slowly cooled in the furnace.
Since the periphery of the abutting portion is fixed, the difference in shrinkage between A and 8B is absorbed in other parts, making it possible to reduce the gap between the abutting portions to zero.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a diagram in which a metal substrate 6 and two resin plates 8A and 8B constituting a platen are attached to a platen manufacturing jig.

The jig frame 1 is made of a metal such as structural carbon steel that has a strength and shape that will not deform due to heating during adhesive curing and the pressing force of the resin plates 8A and 8B, and has the same coefficient of thermal expansion as the metal substrate 6. The platen component is placed on the lower frame portion 1a, and the upper frame portion 1a has three fixing bolts 3 and four adjustment bolts 4 for pressing the resin plates 8A, 8B against the metal substrate. Seven screw holes 7 are formed into which the screws are screwed. Three fixing bolts 3 are screwed into the three screw holes formed at the center, and adjustment bolts 4 are screwed into the four screw holes formed at both ends.

Incidentally, the arrangement pitch of the adjustment bolts 4 is made larger than that of the fixing bolts 3.

The two holding plates 2 on both wings are each fixed to the tips of the two adjustment bolts 4, and the contact surfaces with the resin plates 8A, 8B are mirror-finished to reduce frictional resistance. The fixing structure between the adjustment bolt 4 and the holding plate 2 is as shown in the enlarged view of FIG. 2. That is, the tip of the adjustment bolt 4 is tapered to a predetermined length and fitted into the stepped hole 2a of the holding plate 2, and a retaining ring 43 is attached to the two washers for constantly pressurizing the holding plate 2 downward. 41
A spring member, ie, a coil spring 42, is provided between the spring member and the coil spring 42.

Next, an example of how this platen manufacturing jig is used will be explained. First, after degreasing the adhesive surface with, for example, a fluorocarbon-based solvent, the metal substrate 6 of the platen, which has been temporarily bonded with a film-like epoxy thermosetting adhesive 7 and a cyanoacrylate instant adhesive, is attached to the lower frame of the jig frame 1. Part 1
Place it on a. Next, two polyimide resin plates 8A, 8 whose adhesive surfaces were roughened with cloth paper #100
B is placed on the metal substrate 6 and aligned by pressing strongly from the left and right so that there is no gap at the center abutment part. Thereafter, the fixing bolts 3 on the butt line of the two resin plates 8A, 8B are first tightened, and then both sides are tightened in order to force the resin plates 8A, 8B against the metal substrate 6.

Next, the four adjustment bolts 4 on both wings are tightened, and the other parts of the two resin plates 8A and 8B are pressed against the metal substrate 6 lightly on the entire surface using the pressing plate 2 via the coil spring 42.

Once the platen components are set in the platen manufacturing jig in this way, they are placed in a heating furnace and
After heating at 170℃ for 70 minutes, slowly cool in the furnace. As a result, the metal substrate 6 and the two resin plates 8A and 8B are bonded together without any displacement of the resin plates.

FIG. 3 shows a cross-sectional view of a platen manufactured in this manner.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to bond the metal substrate constituting the platen and the two resin plates with an extremely simple structure and with high precision.

Correct machining or re-bonding operations can therefore be eliminated, significantly reducing manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a front view of a platen manufacturing jig according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of the platen manufacturing jig of this embodiment, and FIG. 3 is a side sectional view of the platen. In the figure, 1 is a jig frame, 2 is a holding plate, 3 is a fixing bolt, 4 is an adjustment bolt, 6 is a metal board,
7 indicates an adhesive, and 8A and 8B indicate resin plates.

Claims (1)

[Claims] 1 This bonding jig is a platen in which two resin plates 8A and 8B are heat-bonded on a metal substrate 6 with their end surfaces abutted against each other, and its lower frame portion 1
a jig frame 1 on which the platen constituent members 6, 8A, 8B are placed; and a butt portion of the two resin plates 8A, 8B that are screwed into the center of the upper frame portion 1b of the jig frame 1. and three fixing bolts 3 that firmly press the vicinity of both sides, and the upper frame part 1 of the jig frame 1.
Adjustment bolts screwed into both sides of b, 4
A platen manufacturing jig characterized in that the platen manufacturing jig is equipped with two pressing plates 4 which are fixed to the tip of the platen via a spring member 42 and lightly press the two resin plates 8A and 8B.