JPH0126462Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a base paper locking device for a printing device, and more specifically to a device for securing the edge of a printing base paper to the outer peripheral surface of a printing plate cylinder of a rotary printing device. This relates to a base paper locking device.

Background of the invention As one of the base paper locking devices for rotary printing equipment,
One end of the printing base paper is held between a magnetic plate provided on the outer peripheral surface of the printing plate cylinder along one generatrix of the printing plate cylinder and a clamp plate selectively attracted to the magnetic plate. A clamp-type base paper locking device configured to lock the printing base paper to the outer peripheral surface of the printing plate cylinder is disclosed in Japanese Patent Application No. 57-21845 (Japanese Unexamined Patent Application Publication No. 1983-1983) filed by the same applicant as the present applicant. 138650) and Japanese Patent Application No. 57-207217 (Japanese Unexamined Patent Publication No. 59-96984).

The above-mentioned clamp-type base paper locking device is suitable for locking thin printing base paper, such as so-called headless stencil printing base paper, to a printing plate cylinder, which does not have a locking reinforcing piece at the locking end. This type of base paper locking device is suitable for printing base paper and can be satisfactorily locked onto the printing plate cylinder, and this locking action is satisfactory. Even if the clamp plate is pulled away from the magnet plate to release the printing base paper from the printing plate cylinder, the locked end of the printing paper will stick tightly to the surface of the magnet plate due to static electricity or other influences. As a result, it becomes difficult to carry out the subsequent plate removal work to remove the printing base paper from the printing plate cylinder. ), Utility Application No. 56-97030 (Utility Application No. 58-3266), Utility Application No. 57-63378 (Utility Application No. 58-
164765), the printing base paper is not peeled off from the printing plate cylinder, and plate ejection failure is likely to occur. In particular, like paper for stencil printing, which is made using a thermal process,
Printing base paper, which is extremely thin and has a highly smooth surface, tends to adhere closely to the surface of the magnetic plate and easily causes plate ejection failure.

Purpose of the invention The present invention releases the close contact between the locked end of the printing base paper and the magnet plate so that when the clamp plate is pulled away from the magnet plate and the clamp is released, the plate is released smoothly. It is an object of the present invention to provide a clamp-type base paper locking device that is improved so that the locking end of the base paper floats away from a magnetic plate.

Structure of the invention According to the invention, the above-mentioned object is to provide a magnetic plate that is selectively attracted to the magnetic plate provided on the outer peripheral surface of the printing plate cylinder along one generatrix of the printing plate cylinder. In a base paper locking device of a printing apparatus, which clamps one end of a printing base paper with a clamp plate and locks the printing base paper to the outer circumferential surface of the printing plate cylinder, the base paper is fixed at one side edge. This is achieved by a base paper locking device having an elastic thin piece fixed to the outer circumferential surface of the printing plate cylinder and having the other side edge extending toward the upper vicinity of the magnetic plate in the free state. .

Effects of the invention According to the above-described configuration, the clamp plate clamps the locking end of the printing base paper and is attracted to the magnetic plate, and the locking end of the printing base paper is locked to the printing plate cylinder. When the elastic thin piece is placed between the printing base paper and the printing plate cylinder or the magnet plate, it is elastically deformed by the pressing force of the clamp plate, the tension of the printing base paper against the printing plate cylinder, and the sticking force. They are tightly clamped and bent, but when the clamp plate is pulled away from the magnet plate and the printing base paper is released from the printing plate cylinder, the elastic thin pieces are freed by their own elasticity. It is restored to its original shape, and along with this restoration, the locking end of the printing base paper is separated from the surface of the magnetic plate and becomes lifted above the magnetic plate. This makes it possible to easily and reliably perform the action of peeling off the printing base paper from the printing plate cylinder from its locked end when discharging the plate, thereby eliminating any trouble in plate discharge.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail with reference to embodiments with reference to the accompanying drawings.

1 to 5 show one embodiment of the paper locking device according to the present invention. In these figures, reference numeral 1 indicates a cylindrical printing plate cylinder, which is rotatably engaged with the outer circumferential surface of an annular guide peripheral part 2 provided at both ends. It is rotatably supported by a machine frame (not shown) around its own central axis by a plurality of support rollers 3.

A plate mounting seat 4 having a flat outer surface (upper surface) 5 extending along one generatrix of the printing plate cylinder 1 is provided on a part of the outer peripheral surface of the printing plate cylinder 1.
A band-shaped magnet plate 6 is embedded and fixed in the plate mounting seat along one generatrix of the printing plate cylinder 1.
The magnet plate 6 is made of a permanent magnet with appropriate flexibility, such as a rubber magnet with a multipolar structure, and its outer surface (upper surface) 6a is flush with the outer surface 5 of the plate mounting seat 4.

Printing plate cylinder 1 is attached from the magnet plate mounting part of the plate mounting seat part 4.
Bearing brackets 7 are provided at both ends of the circumferentially offset position, and pivot shafts 9 integrally provided at both ends of a strip-like clamp plate 8 are rotatable in the bearing brackets. Possibly engaged.
The clamp plate 8 is pivoted from the printing plate cylinder 1 by a pivot shaft 9 extending along an axis parallel to one generatrix of the printing plate cylinder 1, and as shown in FIG. A first position (clamp position) magnetically attracted to the plate 6 and a position rotated approximately 180° from the first position as shown in FIGS. It is rotatable about the pivot shaft 9 between a second position (unclamping position) where it is separated and magnetically attracted to another magnet plate 11 .

A driven gear 10 is attached to one end of one of the pivot shafts 9, and a drive gear (not shown) selectively meshes with the driven gear. 8 is adapted to be rotationally driven between the first position and the second position. If a more detailed explanation of the drive structure of the clamp plate 8 is required, please refer to the aforementioned Japanese Patent Application No. 57-207217.

The plate mounting seat 4 has an inclined surface 12 at the end opposite to the mounting portion of the clamp plate 8, and one side edge of the elastic thin piece 13 is attached to the inclined surface as appropriate during bonding. fixed by means. Elastic flake 13
is composed of a thin elastic plate-like member such as a polyester sheet with a thickness of approximately 0.5 to 0.05 mm, and in a free state extends along the inclined surface 12 and the tip thereof is connected to the magnetic plate 6. It has a plurality of protruding spring pieces 14 located near the top and spaced apart from each other in the axial direction of the printing plate cylinder 1.

Next, the operation of the paper locking device according to the present invention will be explained with reference to FIGS. 2 to 5.

FIG. 2 shows the start of the plating process in which the printing base paper S is attached to the outer peripheral surface of the printing plate cylinder I. At this time, the clamp plate 8 is in the second position and is magnetically attracted to the magnet plate 11, and the elastic thin piece 13 is in a free state with its protruding spring piece 1.
4 extends along the inclined surface 12 and is located at a position separated from the upper surface 6a of the magnet plate 6. In the above-described state, the printing base paper S is fed toward the plate mounting seat 4 from the inclined surface 12 side. This printing base paper S
slides on the elastic thin piece 13 toward the plate mounting seat 4, and as shown in FIG. Once in this position, the feed is stopped, and then the clamp plate 8 is rotated clockwise in the figure around the pivot shaft 9, moving from the second position to the first position.

As shown in FIG. 4, when the clamp plate 8 is located at the first position, the clamp plate 8 is magnetically attracted to the magnet plate 6, so that the end of the printing base paper S is held by the magnet. The elastic thin pieces 13 are clamped between the plate 6 and the clamp plate 8 and are locked to the outer circumferential surface of the printing plate cylinder 1, and the elastic thin pieces 13 are pressed by the clamp plate 8 and elastically deformed, and the protruding spring pieces 14 are used for printing. Base paper S
and the magnet plate 6, and comes to be in close contact with the upper surface 6a of the magnet plate 6.

As described above, after the locking end of the printing base paper S is locked to the outer circumferential surface of the printing plate cylinder 1, the printing plate cylinder 1 rotates counterclockwise in the figure, thereby locking the printing base paper S. is wrapped around and attached to the outer peripheral surface of the printing plate cylinder 1. This completes the printing of the printing base paper S.

The printing base paper S wrapped around the outer peripheral surface of the printing plate cylinder 1 is removed from the printing plate cylinder 1 by rotating the clamp plate 8 in the counterclockwise direction as shown in the figure around the pivot 9. You can start. When the clamp plate 8 rotates counterclockwise in the figure around the pivot 9, the clamp plate 8 moves away from the first position and is released from the magnetic attraction with the magnet plate 6, and at the same time Printing plate cylinder 1 for printing base paper S
The lock is released. At this time, the elastic thin piece 13 is held on the upper surface 6a of the magnet plate 6 by the clamp plate 8.
Since the elastic thin piece 13 is released from being pressed toward the upper side, the elastic thin piece 13 becomes free and returns to its free state shape due to its own elasticity. As a result, the protruding spring piece portion 14 of the elastic thin piece 13 is attached to the upper surface 6a of the magnet plate 6.
It is located further away and near the upper part of the magnet plate 6. Due to the above-described restoring movement of the elastic thin piece 13, especially the protruding spring piece 14, at this time, the printing base paper S
Even if the locking end portion is in close contact with the top surface 6a of the magnet plate 6 due to static electricity or other influences, it is pulled away from the top surface 6a of the magnet plate 6, and as shown in FIG. The locking end of S protrudes from the tip of the elastic thin piece 13 and is positioned above the upper surface 6a of the magnet plate 6. This makes it possible to easily peel off the printing base paper S from the printing plate cylinder 1 from the locked end.

In the embodiment described above, the elastic thin piece 13 has a plurality of protruding spring pieces 14, but the elastic thin piece 13 used in the base paper locking device according to the present invention has a plurality of protruding spring pieces 14.
However, as shown in FIG. 6, the protruding spring piece 14 is connected to the printing plate cylinder 1.
The protruding spring piece 14 does not necessarily have to be configured to be pressed against the upper surface 6a of the magnet plate 6 by the clamp plate 8. The piece 14 is attached to the upper surface 6 of the magnetic plate 6 by the sticking force or tension generated on the printing base paper S when the printing base paper S is wound and attached to the outer peripheral surface of the printing plate cylinder 1.
(a) or pressed against the upper surface of the plate mounting seat 4, therefore, the elastic thin piece 13 does not necessarily have to be provided so as to engage with the clamp plate 8.

In the above, the present invention has been described in detail with respect to specific embodiments, but the present invention is not limited to these, and it is understood that various embodiments are possible within the scope of the present invention. It will be clear to those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of a printing plate cylinder equipped with a base paper locking device according to the present invention, and FIGS. 2 to 5 are a base paper locking device according to the present invention shown in FIG. FIG. 6 is a perspective view showing another embodiment of the printing plate cylinder equipped with a base paper locking device according to the present invention. DESCRIPTION OF SYMBOLS 1...Printing plate cylinder, 2...Guiding circumference, 3...Support roller, 4...Plate mounting seat, 5...Outer surface, 6...
...Magnet plate, 6a...Top surface, 7...Bearing bracket, 8...Clamp plate, 9...Pivot, 10...Gear, 11...Magnet plate, 12...Slope, 13...
Elastic thin piece, 14...Protruding spring piece part.

Claims (1)

[Scope of utility model registration request] One end of the printing base paper is held between a magnetic plate provided on the outer peripheral surface of the printing plate cylinder along one generatrix of the printing plate cylinder and a clamp plate selectively attracted to the magnetic plate. In a base paper locking device of a printing device that locks printing base paper to the outer peripheral surface of the printing plate cylinder, one side edge is fixed to the outer peripheral surface of the printing plate cylinder and the other side is fixed to the outer peripheral surface of the printing plate cylinder in a free state. A base paper locking device for a printing device, the side edge of which has an elastic thin piece extending toward the upper vicinity of the magnetic plate.