JPS6332371B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contact printing machine in which a light source is installed below and irradiates upward, such as a multi-print printer.

As shown in FIG. 1, this type of conventional contact printing machine has a light source 2 facing upward below the printing machine main body 1, a frame around the blanket 3b, and a frame placed on one side of the printing machine main body 1. One method is to fix the blanket with a hinge 4, etc., and open and close it in the vertical direction, and the other is to wrap the blanket 3a itself, which is fixed at one end 5 to the main body, around a roller 6a, as shown in FIG.
At the time, there is a system in which the roller 6a is moved while pushing out the transparent plate 7 of the main body 1 in the direction of the arrow, and after the blanket is brought into close contact with the blanket, the roller 6a is moved again in the opposite direction to wind it up, thereby opening and closing the blanket.

However, in the first vertical opening/closing method, when the blanket 3b is closed, the air accumulated in the rubber bank provided around the transparent plate 7 of the main body 1 is discharged, and the blanket, transparent plate, and Not only does it take a considerable amount of time for the close contact material (printed paper) inserted between them to come into close contact, but the blanket attached to the frame gets old as it is repeatedly opened and closed up and down. However, there are disadvantages such as the tension of the blanket loosening, causing air pockets, and the inverted object set between the blanket 3b and the transparent plate 7 being pulled by the blanket, causing accidents such as misalignment. In the second roll-up and extrusion method, the rolled up blanket is pushed out and closed to bring it into close contact, so there is less air pockets in the bank rubber provided around the transparent plate 7, and the time for close contact becomes faster. Due to the push-out process, the blanket may come into contact with the object that is in close contact while the blanket is running, causing a misalignment of the blanket.In addition to the disadvantage that it is difficult to adjust the winding strength of the blanket, it is also difficult to adjust the height of the positioning pin. Not only is there a limit on the number of sheets of film (original documents) that can be closely stacked together, but also there are drawbacks such as the fact that dust is also rolled up.

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to allow the blanket to run over the printing machine main body without touching the closely reversed object at all without winding it up, and to allow the blanket to run on the printing machine body without touching the inverted object at all, and after covering the blanket on the transparent plate. To provide a contact printing machine capable of shortening contact time.

In order to achieve the above object, the present invention provides a flexible sheet-like blanket that is placed between the rear surface and the top surface of the printing machine main body, with a fixed distance between the top surface and the closely inverted object. A guide drive device capable of reciprocating in the front and rear directions of the printing machine main body, a tension adjustment mechanism that relieves the tension so that the blanket is pulled and hangs in the left and right directions of the printing machine main body on the upper surface of the main body, and the printing machine The pressure is transferred to the front and rear of the printing machine body in a non-contact manner above the blanket that has been pulled in the horizontal direction of the main body, and the pressure is transferred to roll in the front and back direction while pressing the top surface of the blanket whose tension has been relieved. It is characterized by being equipped with rollers.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 9.
The diagram will be explained.

FIG. 3 is a perspective view of a contact printing machine showing one embodiment.
a and 2a, both left and right top covers 3 and 4, a front cover 5 and a presser roller cover 6 are provided, and a bank rubber 8 is provided around the transparent plate (platen glass plate) 7 attached to the top surface, and a bank rubber 8 is provided on the front side. Register pin plates 9 are respectively attached, and a flexible sheet-like blanket 10 is placed between the rear and top surfaces of the printing machine main body 1 and on the transparent plate 7 to cover these. It is provided so that its both sides are guided through link plates 11 so that it can reciprocate in a horizontally tensioned state while maintaining a constant distance from the closely inverted object being held (details are shown in Figs. 6 and 9a to 9a). 9c), and a bowl-shaped protrusion 10a is provided at the front end of the blanket 10 to cover the pin 9a of the pin plate 9.

FIG. 4 is a top view showing the contact printing machine with both left top covers 3, 4 and presser roller cover 6 removed, and FIG. 5 is a top view of the contact printing machine with the right side cover 2 removed.
It is a right side view with part a removed. In both of these figures, the blanket 10 is supported via a number of blanket link plates 11 attached at intervals on both side edges, and each of these link plates 11 is attached to the upper part of the printing machine main body. The blanket rail body 12 is provided so as to be movable in the left-right direction on both left and right sides of the blanket rail body 12, and is guided and supported by a blanket rail body 12 in which a guide roller 11a is housed. Each link board 11 has a guide roller 11a and a rope 13.
(Details are shown in Figures 6 and 8 (see Figure 8).
In the figure, all but one guide roller 11a is omitted). In addition, in FIG. 5, 14a to 1
4d indicates a rope reel that drives the guide roller 11a via the rope 13, and the rope reel 14c is driven by a motor via the timing belt 15.
Driven by M ₁ .

Further, the blanket rail body 12 is attached to a blanket tensioning mechanism 17 fixedly provided on both left and right sides of the upper part of the printing machine main body 1.
The blanket tensioning mechanism 17 is configured to be threadedly engaged with a screw shaft 46 driven by a motor M ₂ via a timing belt pulley 18 and a timing belt 19, and by driving the screw shaft 46, It is configured to move the frame 45 of the tension mechanism 17 in the lateral direction. The tension mechanism 17 and the blanket rail body 12 connected thereto are integrally supported by a horse body 20 attached to the body 1 via a saddle 21 so as to be able to slide laterally. (See Figure 6 for details).

Therefore, in the process of covering the printing machine main body from the rear surface to the upper surface, that is, the closely inverted object on the transparent plate 7 (FIGS. 9a to 9c), the blanket rail body 12 is moved by the tension mechanism 17. It is held in an outwardly displaced state by the , so that it is kept in tension and does not come into contact with the closely inverted object. At this time, if the tension near the front end of the blanket 10 by the blanket rail body 12 through the link plate 11 is insufficient, and there is a risk that the intermediate portion may sag, It is also possible to assist in the above-mentioned tensioning action by attaching a wire to the front end of the blanket.

After the blanket 10 covers the transparent plate 7 as described above, the presser roller 30, which is provided to roll on the surface of the blanket 10, is attached to both ends via a shaft 31, as shown in FIG. A presser roller guide frame 34 that includes a support wheel 32 and has a long hole 33 bored inside the support wheel 32 through which the shaft 31 passes.
is connected to a traction rope 35 on both its front and rear sides and is configured to slide on a guide rail 36. Details of this structure are shown in the perspective views of FIGS. 7 and 8, which are longitudinal sectional views of the main parts.

The presser roller support wheels 32 have different heights,
It is configured to roll on the presser roller lifting rails 37 (37a and 37b) arranged in two rows in the traveling direction (vertical direction) while being pulled by the presser roller guide frame 34 and the pulling rope 35. There is.
and the two rows of presser roller lifting rails 37a,
37b is a protrusion 40 formed on the support car 32 when the support car 32 reaches both ends of the lifting rail.
However, each elevating rail is communicated with each other at both ends so that the support car 32 is transferred to the adjacent elevating rail by being guided by two guiding pieces 41 and 42 provided on the outside of the printing machine main body. . That is, in FIG. 4, 37a indicates a high rail, and 37b indicates a low rail, so the illustrated support car 32 is in a state of rolling downward (i.e., forward) in the figure on the high rail 37a. (In this state, as shown in FIG. 9b, the presser roller 30 passes over the blanket 10 without contacting it.) Then, when the bottom of the figure is reached (Figure 9c),
The protrusion 40 of the left support wheel 32 comes into contact with the guide piece 42, moves the presser roller 30 to the right, and at the same time transfers the support wheel 32 to the adjacent rail 37b. Then,
The process of pressing the upper surface of the blanket 10 with the presser roller 30 and bringing the blanket, the adhesion inverted object, and the transparent plate into close contact with each other (Figures 9d and 9e)
Now, the presser roller 30 and therefore the support wheel 32
By moving the support wheel 32, that is, the presser roller 30 upward (that is, backward) in the figure on the rail 37b, the support roller 32, that is, the presser roller 30 is displaced to a lower position via the downwardly directed slope 37c provided in the middle (see Fig. 9d). ). Therefore, the pressing roller 30 presses the surface of the blanket 10, and the blanket 10 and the inverted object are brought into close contact with the transparent plate 7 (FIG. 9e).
Note that when the support wheel 32 is further moved upward in the figure, it passes through the upward slope 37d and rises to a high position, and at the same time comes into contact with the guide piece 41 at the right end and moves the entire presser roller 30 to the left. At the same time, the supporting wheel 32 is transferred again to the left high rail 37a and returns to the starting position (FIG. 9a). In FIG. 5, 38a to 38d indicate rope reels that drive the presser roller guide frame 34 via the rope 35, and 39 indicates a timing belt that drives the rope reel 38c by the motor _M3 .

According to this embodiment, in the starting position as shown in FIG. Place closely inverted objects made of register films or the like on the plate 7, and after fixing the front (front side) end of the closely inverted objects with the resistor pin 9a, drive the motor _M1 , and the rope The blanket 10 is pulled forward along the blanket rail body 12 via the guide roller 11a pulled by the rope 13 which engages the reels 14a to 14d to cover the closely inverted object. At this time, the blanket 10 is pulled in the left-right direction by the blanket rail body 12 via the guide roller 11a, so that it does not sag and does not come into contact with the closely inverted object. As the blanket runs, the presser roller 30
Also, in order for the supporting car 32 to run on the higher rail 37a of the lifting rail 37, the blanket 10
It passes above it without affecting the front end and waits in that position (Figures 9b and 9c).
figure). Note that in this position, the presser roller support car 3
2 is transferred by the guide piece 42 to the end of the lower right rail 37b.

Next, in order to eliminate the air existing between the blanket, the closely inverted object, and the transparent plate and bring them into close contact with each other, when the presser roller 30 is moved while pressing the top surface of the blanket 10 from the front to the rear, the blanket tensioning mechanism is activated. After driving the motor _M2 of 17 (Fig. 6) in a direction (in the opposite direction) that relieves the tension in the left-right direction (lateral direction) of the printing machine body of the blanket 10 so that it hangs a little,
While the support car 32 travels backward on the lower rail 37b by driving the motor _M3 , the presser roll 30 descends downward, and as shown in FIGS. 9d and 9e, the surface of the blanket 10 is Since it rolls while pressing on the top, air is shut out and the sealing action is performed smoothly.

After the baking work is completed, the blanket tensioning mechanism 17
After driving the motor M ₂ in the direction of pulling the blanket 10 in the lateral direction (Fig. 6), the motor M ₁ is driven in the opposite direction to pull the blanket 10 upwardly onto the body 1 without contacting the baked-on object. When the engine is moved back toward the rear of the engine, it returns to the starting position shown in FIG. 9a.

In addition, in the above embodiment, the blanket 10
Although a mechanism equipped with a screw fitting mechanism has been described as a tension mechanism for laterally tensioning or loosening the tension, it is needless to say that the mechanism is not limited to this. In addition, as a means for moving the presser roller 30 in two different heights, two rows of presser roller lifting rails have been described. Of course, various design changes are possible, such as raising and lowering it in two stages by operation.

As explained above, the present invention includes a guide drive device that allows a flexible blanket to be reciprocated between the rear surface and the top surface of the printing machine main body at a constant distance from the closely inverted object on the top surface; It is constructed with a tensioning mechanism that pulls or relaxes the blanket in the lateral direction on the upper surface of the main body, and a presser roller that rolls back and forth on the upper surface of the blanket whose tension has been relieved, so that the blanket can be held in close contact with the reverse object. The printing machine can be moved over the main body of the printing machine without touching it at all, and after covering the transparent plate with a blanket, the blanket is hung left and right, and the pressure roller rolls over it in the front and rear directions. Air existing between the blanket and the object to be brought into close contact with each other is quickly removed, and the time of close contact can be shortened.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views of a conventional contact printing machine, FIG. 3 is a perspective view of a contact printing machine showing an embodiment of the present invention, and FIG. 4 similarly shows the left and right top covers and the presser roller cover. Figure 5 is a top view with the side cover removed, and Figure 5 is a right side view with the side cover removed.
Fig. 6 is an enlarged cross-sectional view of the main part showing the blanket tensioning mechanism, Fig. 7 is an enlarged cross-sectional view of the main part showing the drive mechanism of the presser roller, Fig. 8 is a perspective view of the same, and Figs. 9a to 9e are the final baking. FIG. 2 is a cross-sectional view of main parts showing the operating state of the blanket and presser roller in the machine. DESCRIPTION OF SYMBOLS 1...Contact printing machine main body, 2...Light source, 10...Blanket, 11...Blanket link plate, 11a...
Guide roller, 12... Blanket trail body, 1
7... Blanket tension mechanism, 30... Presser roller,
32... Presser roller support car, 37... Presser roller lifting rail.

Claims (1)

[Claims] 1. In a contact printing machine in which a light source is installed below the main body and irradiates upward, a flexible sheet-like blanket is placed between the rear surface and the top surface of the main body of the printing machine, and a contact reverse object is placed on the top surface. A guide drive device capable of reciprocating in the front and back direction of the printing machine main body at a constant interval, and the above-mentioned blanket are pulled in the left and right direction of the printing machine main body on the upper surface of the main body, and the tension is relaxed so that it hangs. Both ends are supported by a tension adjustment mechanism and a support mechanism that allows selective selection of the heights of both the upper position of the blanket stretched in the left and right direction and the upper surface position of the blanket whose tension is relieved. A contact printing machine characterized by being equipped with a pressure roller.