JPS6142249B2 - - Google Patents

Description

[Detailed Description of the Invention] When printing a photosensitive material for plate making etc., usually
The large original plate and photosensitive material, which are polymerized and placed on the transparent plate for exposure of the printing frame, are covered with a flexible airtight sheet such as rubber, and the original plate and photosensitive material are transferred to the transparent plate by vacuum action. Expose after placing the object in close contact with the object.

A device that performs the above operation semi-automatically is to wrap an airtight sheet around a spring roller that is urged to rotate around its axis by an internal coil spring, and then connect the front end of the airtight sheet to the front end of a transparent plate. By fixing it to the edge and moving the spring roller toward the rear end of the transparent plate against the coil spring, the airtight sheet is expanded to cover the original plate and photosensitive material placed thereon. There is a device in which the air between the airtight sheet and the transparent plate is pushed out by a squeezing roller that rolls on the airtight sheet together with a spring roller, and then the air is taken in.

However, in the conventional type, the height of the spring roller is constant, so as the spring roller moves toward the rear of the transparent plate, the diameter of the airtight sheet wrapped around the spring roller gradually becomes smaller. As the angle of inclination of the airtight sheet between the roller and the squeezing roller with respect to the transparent plate gradually increases, the tension of the airtight sheet due to the bias of the spring gradually increases.

As a result, the squeezing roller would tend to lift up, and there was a risk that the air would not be pushed out sufficiently.

The present invention mainly relates to a printing frame for plate making, which solves the above-mentioned drawbacks by keeping the inclination angle of the airtight sheet almost constant regardless of the front and rear positions of the spring rollers. This will be explained in detail based on the drawings.

In the following description, "front" refers to the direction in which the airtight sheet is rolled up, and "back" refers to the direction in which the airtight sheet is unfolded.

1 is a housing, 2 is a transparent plate such as a glass plate mounted on the upper plate 1a of the housing 1, 3 is an intake hole bored in the upper plate 1a and the transparent plate 2, and 4 is a light source for printing. It is.

The front part (left part in the drawing) of the upper plate 1a is provided with a stepped part 5 which is one step lower, and elongated holes 6, 6 facing in the front and rear direction are cut in both left and right sides.

On the upper outer surface of the partition plate 1c, which is provided close to the inside of the left and right side plates 1b of the housing 1 and parallel to each side plate 1b, there is a rail 7 that faces the front-rear direction and has a slight gap with the partition plate 1c. are fixed respectively.

Below the front of each rail 7 are driven sprockets 8a and 8b that are arranged close to each other vertically.
A drive sprocket 9 is pivotally mounted on the partition plate 1c at the rear lower part thereof, with an axis extending in the left and right direction, and an endless chain 10 is wound around the sprockets 8a, 8b, and 9.

The upper surface of the driving sprocket 9 is located slightly lower than the upper surface of the upper driven sprocket 8a, and therefore the upper running surface of the endless chain 10 is slightly inclined rearward and downward.

Directly below the upper running surface of the endless chain 10, a chain holder 11 that is close to and parallel to the endless chain 10 is fixed to the partition plate 1c.

Reference numeral 12 denotes a rectangular running body, and rollers 13 pivotally installed near the four corners thereof grip both upper and lower edges of the rail 7 so as to be freely movable.

Upper rollers 13, 13 lined up before and after the traveling body 12
The front and rear small rollers 14,
The small rollers 14, 14 arranged in front and behind each other sandwich the front and rear sides of the vertically oriented lifting rod 15.

The lower end of the lifting rod 15 is pivotally connected to the endless chain 10 with a horizontal pin 16, and the upper end thereof also protrudes from the elongated hole 6, and a horizontally elongated bearing fitting 17 is fixed to the upper end.

As shown in FIGS. 2 and 5, the endless chain 10 has a water pin 16 connected to a lower driven sprocket 8.
It is caused to reciprocate from the front surface of the upper driven sprocket 8a through the front surface and upper surface of the upper driven sprocket 8a to just before the drive sprocket 9 by a motor (not shown).

Therefore, as the endless chain 10 runs, the lifting rod 15 supported by the running body 12 moves up and down while always facing in the vertical direction, and is guided by the upper running surface of the chain 10 and moves back and forth along the rail 7. Run.

Although not shown, the left and right partition plates 1c of the housing 1
A device similar to that described above is also provided symmetrically, and both left and right bearing fittings 17 are connected by a connecting rod 18 in the left and right direction.

Vertical hole 1 bored in the front lower part of both bearing fittings 17
9, both ends of the squeezing roller 20 are pivotally supported.

Fixed shaft 2 fixed between the rear and upper parts of both bearing fittings 17
1 has a spring roller 22 pivoted around a fixed shaft 21 by an internal coil spring (not shown) so as to rotate with its upper portion facing forward.

The spring roller 22 has a flexible light-shielding airtight sheet 2 made of rubber or the like, whose free end extends downward and forward.
3 is wound, and a band iron 24 protruding from both sides is fixed to the lower surface of the free end.

Reference numeral 25 denotes a cover for the rollers 20 and 22 that is fixed to the upper ends of the left and right lifting rods 15. At both ends of the cover 25, there are front U-shaped engagement hooks 26.
is fixed.

As shown in FIG. 2, when the lower horizontal pin 16 of the lifting rod 15 is located at the front end of the lower driven sprocket 8, both rollers 20, 22 are on the step 5 of the housing 1.

At this time, the squeezing roller 20 rides on the stepped portion 5 by sandwiching the free end of the airtight sheet 23, and the airtight sheet 23 wrapped around the spring roller 22 rides on the stepped portion 5.
The airtight sheet 23 between the rollers 20 and 22 is inclined at a predetermined angle, and is spaced slightly upwardly.
is engaged with the engagement hook 26.

When the baking frame having the above-mentioned configuration starts to run backwards from the state shown in FIG. Until the horizontal pin 16 reaches the upper end of the sprocket 8, it moves rearward and upward in an arcuate manner, reaching the position shown by the imaginary line in FIG.

Then, the lower ends of the lifting rods 15 are connected to the chain receiving rods 1 through the endless chain 10.
1 starts running backwards on the transparent plate 2.

At this time, as shown in FIG. 4, the band iron 24 is locked to the front end surface of the transparent plate 2,
As it moves backward, the airtight sheet 23 is spread over the transparent plate 2 and covers the original plate and photosensitive material (both not shown) on the transparent plate 2. Further, at this time, the rolling squeezing roller 20 presses the airtight sheet 23 from the upper surface by its own weight and pushes out the air.

As shown by the imaginary line in FIG. 5, the diameter of the airtight sheet 23 wrapped around the spring roller 22 changes as the spring roller 22 moves backward.
The diameter gradually becomes smaller, but as mentioned above, the lifting rod 15
Since the chain holder 11 supporting the chain rod 11 is slightly inclined backward and downward, the spring roller 22 is slightly lowered, and the spring roller 22 and the squeezing roller 2
The inclination angle of the airtight sheet 23 between 0 and 0 is always kept substantially constant.

Furthermore, since the squeezing roller 20 is pivotally supported in the vertically elongated hole 19 of the bearing fitting 17, it rolls on the upper surface of the airtight sheet 23 with appropriate pressure, regardless of the lowering of the elevating rod 15.

When the endless chain 10 is reversed and the lifting rod 15 is advanced, the spring roller 22 automatically moves forward while winding up the airtight sheet 23 on the transparent plate 2, and when it reaches the front end of the transparent plate 2, it engages. Hook 2
6 scoops up the band iron and returns to the state shown in FIG.

As mentioned above, the baking frame of the present invention has an airtight sheet 2 between the ironing roller 20 and the spring roller 22.
3 can be maintained at a predetermined optimum angle at all times regardless of the position of the spring roller 22, so during plate making, the transparent plate 2, large original plate and photosensitive material can be brought into perfect contact with each other, which is convenient. be.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the baking frame of the present invention before the start of operation, FIG. 2 is a longitudinal sectional view taken along line A-A in FIG. 1, and FIG. 4 is a vertical cross-sectional view taken along the line B, FIG. 4 is a longitudinal sectional side view of the main part of the above-mentioned baking frame during operation, and FIG. FIG. 1...Casing, 1a...Top plate, 1b...Side plate, 1
c...Partition plate, 2...Transparent plate, 3...Intake port, 4
...Light source, 5...Step, 6...Elongated hole, 7...Rail, 8a, 8b...Driver sprocket, 9...Drive sprocket, 10...Endless chain, 11...
... Chain support, 12 ... Traveling body, 13 ... Roller, 14 ... Small roller, 15 ... Lifting rod, 16 ...
...Pin, 17...Bearing fitting, 18...Connecting rod, 1
9...Vertical long hole, 20...Stretching roller, 21...
Fixed shaft, 22... Spring roller, 23... Airtight sheet, 24... Band iron, 25... Cover, 26
...Engagement hook.

Claims (1)

[Claims] 1. A soft airtight sheet whose front end is fixed to the baking frame body and whose other end is wound around a spring roller that rolls along a transparent plate is rolled onto the transparent plate by the rolling of the spring roller. A printing frame for plate making which is configured to extend in a direction includes: a running body that is driven to reciprocate along a pair of rails facing in the front and back direction installed on both sides of the baking frame body; A pair of left and right lifting rods that are mounted so as to be slidable in the vertical direction; a left-right straining roller that is loosely fitted in the upper part of the lifting rod so as to be rotatable and movable in the vertical direction; and the straining roller. At the rear upper part, a spring roller is rotatably supported by the elevating rod and has a front end fixed to the baking frame body, and a spring roller is wound around the other end of a soft airtight sheet; Accordingly, the elevating rod is gradually lowered so that the distance between the unwinding part of the airtight sheet and the transparent plate is constant in accordance with the amount of decrease in the outer diameter of the airtight sheet wound around the spring roller. A baking frame characterized by being equipped with a guide means for guiding. 2. The drive device that drives the traveling body is a pair of left and right chains that move in the front-rear direction and are tilted downward toward the rear. 2. The baking frame according to claim 1, wherein the lifting rod is lowered as it travels rearward.