JPH0564110B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a plate release device for a screen printing machine.

(Prior art) Generally, in this type of plate release device, the seventh
As shown in the figure, a plate frame 43 with a screen 47 stretched above the printing table 41 is arranged close to each other with a slight interval, and one end of the plate frame 43 is attached to the shaft 4.
4, and is rotatably supported by the plate frame 4.
A plate release mechanism 45 is provided at the other end of the plate 3.
As shown in FIG.
The plate release device 45 is operated in synchronization with the movement of the plate frame 43, and the plate frame 43 is rotated upward about the shaft 44 as shown in FIG. It's becoming like that.

(Problems to be Solved by the Invention) However, according to the conventional plate release device described above, while the squeegee 46 is moved along the printing table 41, the plate frame 43 is spaced apart from the table 41 by a predetermined distance. Since the screen 47 is moved upward from the position, the screen 47 is elongated as the squeegee 46 slides under pressure, causing the problem that the image printed on the printing paper is elongated more than the original image of the screen 47. Ta.

Structure of the Invention (Means for Solving the Problems) This invention has been made by focusing on the above-mentioned problems, and it is possible to connect one end of the plate frame, which is placed close to the printing surface, by an axis parallel to the printing surface. In a plate release device for a screen printing machine, which is rotatably supported and whose other end is rotated in a direction away from the printing surface in synchronization with the running of a squeegee by a plate release mechanism consisting of a spring or the like. a support arm rotatably supported on an apparatus frame; an adjustment member that contacts the upper surface of one end of the support arm and rotates the support arm to vertically displace and rotate the support arm to a desired position; A fixing member fixes the other end of the rotated support arm to the plate release rail, and the axis of the fixing member can be moved toward and away from the printing surface.

(Function) Therefore, in the plate release device of the present invention, the position of the shaft 14 is adjusted to the printing surface 21 as shown in FIG.
When the plate frame 12 is adjusted upward, the plate frame 12 moves to a distance G due to the plate release operation that synchronizes with the movement of the squeegee 22.
If the shaft 14 is moved in the direction away from the shaft 14 as shown in FIG. 2, and if the shaft 14 is adjusted downward relative to the printing surface 21 as shown in FIG. It is moved in the direction approaching 14 as shown in . Therefore, as shown in FIG.
By adjusting the shaft 14 to an appropriate position between a position approaching and a position away from the printing surface 21, the original image on the screen 20 and the image printed on the printed material can be accurately matched. can.

(Example) Hereinafter, an example embodying this invention will be described in the third to third embodiments.
This will be explained based on FIG.

In the figure, reference numeral 1 denotes an apparatus frame attached to a screen printing machine, and a U-shaped bracket 2 is fixed to the lower surface of the rear end (right side in FIG. 3). A support arm 3 is rotatably supported at the lower end of the bracket 2 via a support shaft 9.

Reference numeral 4 denotes a swing block, which is rotatably attached to the upper surface of the rear end of the support arm 3 by a pin 5. 6 is an eccentric cam, and the bracket 2
The eccentric cam 6 and the handle 8 constitute an adjustment member. Then, by rotating the handle 8, the eccentric cam 6 is integrally rotated, and the eccentric cam 6
Through engagement with the swinging block 4, the support arm 3 is adapted to be reciprocated and displaced up and down about the support shaft 9.

Reference numeral 11 denotes a plate release rail with a plate frame 12 attached inside, and a circular arc-shaped elongated hole 13 extending vertically is provided at the rear end of the rail, and although not shown in the tip, it As shown in the conventional apparatus, a plate release mechanism is installed which urges the plate release rail 11 upward with a spring. A shaft 14 is rotatably supported at the front end of the support arm 3 at a position corresponding to the elongated hole 13, and a positioning screw 15 is screwed onto one end of the shaft 14 from inside the plate release rail 11. The elongated hole 13 and the shaft 14
and the positioning screw 15 constitute a fixing member. When the positioning screw 15 is loosened, the shaft 14 is vertically adjusted within the elongated hole 13 as the support arm 3 rotates by operating the adjustment members 6 and 8, and when the positioning screw 15 is tightened, the shaft 14 is adjusted. are positioned at appropriate positions in the elongated hole 13. In FIG. 3, reference numeral 16 indicates a scale attached to the rear end edge of the plate release rail 11, and reference numeral 17 indicates an index provided on the support arm 3 to correspond to the scale 16. Also, 18
A support rod is vertically installed on the lower surface of the mounting frame 1, and a stopper 19 that engages with the lower surface of the proximal end of the plate release rail 11 is protruded from the lower end of the support rod.

Therefore, in the plate releasing device of this embodiment constructed as described above, if the handle 8 is rotated by an appropriate amount with the positioning screw 15 loosened, the release via the eccentric cam 6 and the swinging block 4 is performed. The support arm 3 is rotated, and the shaft 14 is connected to the plate release rail 11.
The vertical displacement is adjusted within the elongated hole 13 of. Therefore, by tightening the positioning screw 15 at an arbitrary adjustment position of the shaft 14, the defect position of the plate release rail 11 can be adjusted as appropriate. Therefore, if the image printed on the printed material as a result of test printing is stretched with respect to the original image drawn on the screen 20 of the plate frame 12, by moving and adjusting the shaft 14 upward to an appropriate position, the stretch can be corrected. In addition, if the image on the printed matter is shrunk, moving and adjusting the shaft 14 to an appropriate position below eliminates the shrinkage and allows accurate printing. I can do it. Then, the position of the axis 14 that allows correct printing is determined using the scale 16 and the index 17.
If this is confirmed, readjustment of the shaft 14 will be easier.

It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiments, and can be embodied by arbitrarily changing the shape and configuration of the adjusting member.

Effects of the Invention As described in detail above, according to the present invention, the shaft that rotatably supports one end of the plate frame is configured to be movable in both directions toward and away from the printing surface. This has the excellent effect of eliminating expansion or contraction of the image and allowing accurate printing.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams for explaining the principle operation of the present invention, FIG. 3 is a front view of essential parts of a plate release device showing an embodiment embodying the invention, and FIG. 4 is a cross-sectional view taken along the line 4-4 in Figure 3, Figure 5 is a cross-sectional view taken along the line 5-5 in Figure 3, and Figure 6 is a cross-sectional view taken along the line 6 in Figure 3.
-6 line sectional view and FIGS. 7A and 7B are schematic diagrams showing a conventional plate release device. In the figure, 1 is an apparatus frame, 3 is a support arm, 6 and 8 are eccentric cams and handles constituting adjustment members, 11 is a plate release rail, 12 is a plate frame, 13,
14 and 15 are elongated holes and shaft positioning screws constituting the fixing member, 21 is a printing surface, and 22 is a squeegee.

Claims (1)

[Claims] 1. A plate release structure in which one end of a plate frame 12 disposed close to the printing surface 21 is rotatably supported by a shaft 14 parallel to the printing surface 21, and the other end is formed of a spring or the like. In the plate release device for a screen printing press configured to rotate in a direction away from the printing surface 21 in synchronization with the running of the squeegee 22, the support arm 3 is rotatably supported on the device frame 1; Adjustment members 6 and 8 that displace and rotate the support arm 3 to an arbitrary position in the vertical direction by contacting the upper surface of one end of the support arm 3 and rotating the support arm 3; and the other end of the support arm 3 that has been displaced and rotated. A plate release device for a screen printing machine, comprising fixing members 13, 14, and 15 for fixing the plate to a plate release rail 11, and a shaft 14 of the fixing member can be moved toward and away from a printing surface 21.