JPH10147050A - Printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate positioning between a printing initiation position of a printing sheet and one side periphery of a medium to be printed at the time of implementing printing by wrapping a printing sheet around a roller body. SOLUTION: When a roller body 42 with a printing sheet 34 adhered on its circumference is mounted detachably and rotatably within a supporter 41 including an upper plate part 47 being a substantially semicircular arc, an S polar permanent magnet 52 is fixed on the uppermost of the inner surface of the upper plate part 47, and an N polar permanent magnet 51 is fixed on a part of the outer circumference of the roller body 42, then an S polar permanent magnet 53 is fixed over an appropriate range at these both sides. As such the roller 42 can be held in its stop condition in a predetermined posture through the agency of magnetic attraction forces generated between the permanent magnet 51 and the permanent magnet 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a cell having an open cell,
Using a printing plate sheet on the surface of a porous sheet that can be impregnated with stamp ink and having an ink exuding portion for a desired image portion and an ink non-exuding portion for a non-image portion, a paper such as a postcard (printing medium) ) Relates to a printing apparatus for stamp printing.

[0002]

2. Description of the Related Art Conventionally, a picture,
In order to print a desired image portion such as a character, for example, in Japanese Utility Model Publication No. Sho 62-22381, a mirror image of a predetermined image portion is engraved on an endless rubber plate or the like, and a roller image is formed on the peripheral surface of the roller body. Affix, rotatably support this roller body on the handle,
An apparatus for printing by rolling and moving a roller body along the surface of a printing medium is disclosed.

On the other hand, as disclosed in Japanese Patent Application Laid-Open No. 7-251558, a printing plate sheet made of a porous sheet of a foamed resin having open cells and impregnable with a stamp ink, has a stamp on its surface. Since it is extremely easy to form a mirror image of a predetermined character or picture on the surface, taking advantage of this advantage, the present applicant has previously filed the above-described printing sheet in Japanese Patent Application No. 8-125687. Various types of apparatuses have been proposed in which a roller is detachably mounted on the peripheral surface of a roller body, and the roller is mounted on a handle (support) to roll and move along the surface of a printing medium such as a postcard to print.

[0004]

However, since the roller body is freely rotatable with respect to the support, the printing start position of the printing plate affixed to the circumferential surface of the roller body is at the lower end or the like. Since it is difficult to set and stop at the predetermined position, it is extremely difficult to align the printing start position such as the starting edge of the printing plate sheet with the printing start position of the print-receiving medium. There is a problem that considerable labor and attention are required to cleanly print an image portion on the same portion of a large number of print-receiving media, such as a printing operation.

[0005] In particular, when a printing plate for ink of a different color is exchanged and mounted on the roller body for multicolor printing, if the printing start position on the printing medium is shifted,
There is also a problem that the appearance of the printing result is extremely deteriorated, for example, the positions of the image portions and the colors thereof are shifted or are excessively overlapped, and a large number of printing defects occur. SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and has as its object to provide a printing apparatus capable of obtaining a beautiful printing result without a printing position shift.

[0006]

According to a first aspect of the present invention, there is provided a printing apparatus, comprising: a porous sheet having continuous cells and impregnated with ink; A rotatable roller body for supporting a back surface of a printing plate sheet capable of forming a corresponding ink bleeding part and a non-ink bleeding part corresponding to a part other than the image area, and a rotatable roller body And a magnet made of a pair of magnetic poles attracting each other at positions facing each other is fixed to the outer peripheral surface of the roller body and the support.

According to a second aspect of the present invention, in the printing apparatus according to the first aspect, the magnet of the one magnetic pole is fixed to a part of a peripheral surface of the roller body, and the magnet of the other magnetic pole is fixed. Is fixed so as to face the one magnet at a substantially uppermost portion of a portion of the support that covers the upper portion of the peripheral surface of the roller body. Further, claim 3
According to a second aspect of the present invention, in the printing apparatus according to the second aspect,
The inner circumferential surface of the support is formed on a circumferential surface separated by a distance substantially equal to the circumferential surface of the roller body, and on both sides of the one magnetic pole magnet on the circumferential surface of the roller body. ,
The magnet of the other magnetic pole is appropriately fixed over a circumferential range.

According to a fourth aspect of the present invention, in the printing apparatus according to the second aspect, the inner peripheral surface of the support is formed on a circumferential surface separated from the circumferential surface of the roller body by a substantially equal distance. The magnet of one magnetic pole is appropriately fixed on the both sides of the magnet of the other magnetic pole over the circumferential range. According to a fifth aspect of the present invention, in the printing apparatus according to any one of the first to fourth aspects, the roller body is manually driven to rotate.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described. FIG. 1 is a schematic side sectional view of the stamp unit with the movable lid open, and FIG. 2 is a schematic side sectional view of the stamp unit with the movable lid closed. 1 and 2, the stamp unit basically includes a plate making section 2 on the upper side of the apparatus main body 1 and a printing section 3 on the lower side of the apparatus main body 1. The plate making section 2 and the printing section 3 can be separated. Is configured. That is, the upper and lower sides of the bottomed case 7 of the printing unit 3 are engaged with and disengaged from the upper edge of the side of the bottomed case 7 of the printing unit 3 by the lock claws 5 with biasing springs 6 provided at the lower sides of both sides of the case 4 of the plate making unit 2. The bottomed case 7 can be separated from the case 4 to take out the articles in the bottomed case 7, and can be printed as described later.

First, the structure of the plate making section 2 will be described. A substantially rectangular recess 13 in plan view is formed in the upper part of the case 4 via a stepped portion 12 having four circumferences in plan view, with four side walls 13b and a bottom wall 13a. The bottom wall 13a is provided with a socket hole 14 to which a flash valve 15 as a light irradiation unit can be detachably attached, and a contact member 16 is arranged on the lower surface side of the socket hole 14. A sheet (not shown) having excellent light reflection characteristics, such as aluminum foil, is adhered to the surface of the recess 13. A transparent plate 17 such as a transparent acrylic plate or the like as a plate making unit support for overlappingly supporting a stamp substrate 25 and a light-transmissive original sheet 26 is detachably mounted on the step portion 12. Have been.

An outer lid 8, an intermediate lid 9, and an inner lid 10, which are movable lids, are provided on both left and right sides of the upper part of the case 4, respectively, with pivot pins 18,1.
It is pivotally attached to open and close freely via 9, 20 respectively.
On the lower surface of the inner lid 10, a stamp substrate 25 made of a porous sheet having open cells and impregnated with stamp ink is provided.
Further, a flat pressing member 27 such as a sponge or rubber for pressing the transparent sheet 17 with an even pressure on the transparent plate 17 with the light transmissive original sheet 26 overlaid thereon is adhered. On the lower surface side when the intermediate lid 9 is disposed on the upper surface of the inner lid 10, a pressing bulging portion 28 for uniformly pressing the upper surface of the inner lid 10 at a plurality of places.
Are integrally formed.

A handle 29 is provided on the outer surface of the outer lid 8, and a hook portion 31 for engaging and disengaging with a hole-shaped engaging portion 30 of the case 4 is provided on a free end side of the outer surface of the outer lid 8. Are mounted so as to urge in the engagement direction via a torsion spring 32. Further, when the outer lid 8 is overlaid on the upper surface of the intermediate lid 9, at least two pressing bulges 33 are formed for pressing the intermediate lid 9 almost uniformly.

The engaging portion 30 has a switch (not shown), a new flash valve 15 is mounted in the socket hole 14, the transparent plate 17 is fitted into the step 12, and the transparent plate 17 is inserted. Transparent original sheet 26 on top
And a stamping substrate 25 thereon, and then the inner lid 1
0, the intermediate cover 9 and the outer cover 8 are sequentially stacked, and when the worker applies a predetermined pressing force to engage the hook portion 31 with the engaging portion 30, the switch portion is turned on, and an electric circuit (not shown) is turned on. The flash valve 15 can be made to flash through.

The light irradiating section may be configured to emit a flash lamp such as a xenon lamp or a strobe lamp instead of the flash bulb 15.
Further, since the electric circuit is wired on the back surface side of the recess 13, the worker does not receive an electric shock. When using the stamp substrate 25 in which an ink-impermeable coating is formed on the surface of the porous sheet in advance, a light-transmissive original sheet 2 such as PPC paper (tracing original paper) is used.
6, a black image portion 21 is drawn with carbon black, black ink, a water-based marker or the like, and the original sheet 26 is placed on the transparent plate 17 with the image portion facing up. Stamp substrate 2 with impermeable coating facing down
5, the stamp substrate 25 is pressed by the inner lid 10, the intermediate lid 9 and the outer lid 8 to flash the flash valve 15 and irradiate light including infrared rays from the transparent plate 17 side. It is.

[0015] In this case, the black image portion is heated (heat storage) by the thermal energy of the irradiated light, and the ink impermeable film in a portion in close contact with the image portion is applied to the black image portion. Welded to the image area. So, manuscript sheet 2
6 and the stamp substrate 25 are peeled off, the ink impermeable coating adheres only to the surface portion of the image portion, and is peeled off from the surface of the stamp substrate 25 to have the shape as in the image portion. The ink impermeable coating is perforated, and the portion becomes an ink exuding portion, and the ink transmitting portion is formed according to the mirror image shape of the image portion, and plate making can be performed.

Accordingly, as shown in FIG. 4, one side of the printing plate 34 thus made has an ink bleeding portion 24 corresponding to the mirror image of the image portion, and an ink non-bleeding portion 23 at a position other than the image portion. Is formed. In addition, the stamp substrate 25 of another embodiment has open cells and has a porous material that can be impregnated with the stamp ink, and contains carbon black or a light energy-absorbing substance dispersed therein. The basic material is a foamed resin material such as a polyolefin resin, a polyvinyl chloride resin, or a polyurethane resin, and preferably has flexibility (softness) when formed into a porous sheet. Therefore, open pores are exposed over the entire surface of at least the wide surface of the stamp substrate 25 before plate making (see FIG. 3A).

It is also possible to use a rubber-based material. The thickness of the stamp substrate 25 is about 1 mm to 5 mm. As described above, by containing carbon black or a light energy-sucking substance, when the surface side of this type of stamp substrate 25 is heated, it is melted and the pores exposed on the surface are closed. . In the examples, the weight ratio of the carbon black or the light energy-absorbing substance contained is 1.0 to 1.5% by weight of the carbon black based on the polyurethane foam resin. The content of carbon black is not limited to this, and may be in the range of 0.1% by weight to 15% by weight. If the content of carbon black is larger than 15% by weight, the stamp substrate 25 itself becomes black, and it becomes impossible to know the color of the applied stamp ink, and it is also impossible to know whether or not the stamp ink has been applied. If it is less than 0.1% by weight, sufficient heat cannot be obtained, and the stamp substrate 2
5 cannot be melted.

Further, as the light energy attracting substance,
There are silver chloride and silver bromide. At the time of plate making, PPC paper (manuscript paper for tracing) is used as the manuscript sheet 26 in advance.
Draw a light-impermeable image portion 21 on the surface of a light-transmissive paper such as black, white, gold, silver or the like with light-opaque ink, oily marker, paint, paint, or the like. .

On the other hand, as shown in FIG. 3B, a transparent sheet 22 to be interposed between the original sheet 26 and the wide lower surface of the stamp substrate 25 is prepared. The transparent sheet 22 has the property of melting at a temperature higher than the melting point of the stamp substrate 25 (about 120 ° C. for a soft polyurethane resin and about 70 ° C. for a soft polyolefin resin). High melting point (about 230 ° C) as an example
Transparent PET (Polyethylene Terephthalate)
A resin film is preferable, and the thickness of each sheet is 0.025 m
m is about 0.2 mm.

Light energy that has passed through a portion (non-image portion) other than the image portion 21 of the original sheet 26 passes through the transparent sheet 22 as it is (see FIG. 3C), and the light energy is used as the stamp substrate. 25 in the image area 21
The carbon black near the surface (light-irradiated side) corresponding to a portion other than the image portion (non-image portion) absorbs heat, and the surface corresponding to a portion (non-image portion) other than the image portion 21 on the stamp substrate 25. When the portion is heated and melted, and then solidified, the pores on the surface are closed, and an ink non-bleeding portion 23 having a predetermined thickness is formed (see FIG. 3D).

On the other hand, the original sheet 26 is
Is black containing carbon black, the image area 21 is heated by light energy irradiated from the direction of the transparent plate 17 and its temperature rises, but the transparent sheet 22 corresponding to the image area 21 Conducts heat in the horizontal direction and the like within the thickness of. In other words, the heat generated on the original sheet 26 side is absorbed and dispersed by the transparent sheet 22, and the surface portion of the stamp substrate 25 corresponding to the image area 21 is not heated, and the shape of the image area 21 is not heated. The ink bleeding portion 24 is formed while the pores are exposed. When the image portion 21 is other than black, the light energy is blocked and reflected by the image portion 21, and the surface of the stamp substrate 25 corresponding to the image portion 21 is not heated, and the pores are not heated. Exposed ink bleeding part 2
4 (see FIG. 3D).

Therefore, when the transparent sheet 22 and the original sheet 26 are removed from the wide surface of the stamp substrate 25 after the light irradiation, as shown in FIGS.
The ink bleeding portion 24 remains with the pores in the original sheet 26 in the shape of the mirror image of the image portion 21 exposed, and the non-ink bleeding portion 23 corresponding to the non-image portion forms the stamp substrate 25.
Can be made as a printing plate sheet 34 having a predetermined printing surface formed on the wide surface 25a.

The stamp substrate 25 and the original sheet 26
When making a plate by directly contacting the image portion 21 of the original sheet 26 with the surface of the porous stamp substrate 25 containing carbon black without interposing the transparent sheet 22 between
When the surface portion of the stamp substrate 25 facing the image portion 21 is also heated and melted, and then solidified, the formed ink non-exuding portion comes into close contact with the image portion 21.
When peeling 6, the ink non-exuding portion is exfoliated according to the shape of the image portion 21 to form the ink exuding portion 24 as per the seal imprint.

Next, the configuration of the printing unit 3 will be described. As shown in FIGS. 5 and 6, in the bottomed case 7 of FIG.
A printing table 40 having a rectangular shape in a plan view and a storage section 43 for storing a roller body 42 with a support 41 are formed. When the outer surface of the support 41 is brought into contact with the pair of positioning abutting pieces 44, 44 protruding at positions deviated to one side of the printing table 40, the pair of positioning abutting pieces 44, 44 a The printing start position of the printing plate sheet 34 affixed to the circumferential surface of the roller body 42 is set on the surface of the printing medium 46 such as a postcard placed with its edges abutting. (See FIG. 6).

As shown in FIGS. 5 to 10, the support member 41 includes an upper plate portion 47 having a generally downwardly curved concave cross section, such as a substantially semi-cylindrical shape, which substantially covers the upper portion of the roller body 42, and both right and left plate portions 4.
8 and 48. The support shafts 4 at both ends of the hollow cylindrical roller body 42 are provided near the inner surfaces of the both side plate portions 48 and 48.
Downwardly open (substantially Ω-shaped when viewed from the side) bearing portions 50, 50 for detachably supporting the components 9, 49 are provided. When the inner peripheral surface of the upper plate portion 47 is formed to have a downwardly arcuate cross section such as a substantially semi-cylindrical shape, the inner peripheral surface is separated from the circumferential surface (outer peripheral surface) of the roller body 42 by an almost equal distance. Preferably, it is formed on the peripheral surface, or when the radius of curvature of the inner peripheral surface of the upper plate portion 47 is set to be larger than the radius of curvature of the circumferential surface of the roller body 42, More preferably, the gap between the uppermost part of the inner peripheral surface and the uppermost part of the circumferential surface of the roller body 42 is minimized.

The upper plate 4 of the support 41
The permanent magnets 51 and 52, which are magnets composed of a pair of magnetic poles attracting each other at opposing positions, are fixed to the inner surface side of the roller 7 and the outer peripheral surface of the roller body 42. More specifically, the permanent magnet 51 of one magnetic pole (for example, N pole) is fixed to a part of the peripheral surface of the roller body 42, and the permanent magnet 52 of the other magnetic pole (for example, S pole) Near the uppermost part of the inner surface of the upper plate part 47, the roller body 4
It is fixed at a position facing the permanent magnet 51 disposed on the two sides (see FIGS. 7 and 9).

It should be noted that, in addition to the above configuration, the roller body 4
2, the other magnetic pole (for example, S-pole) is provided on both sides of the one magnetic pole (for example, N-pole) with the permanent magnet 51 interposed therebetween.
The pair of permanent magnets 53, 53 are appropriately fixed over the circumferential range (see FIGS. 7 and 9). Next, a printing operation using this configuration will be described. After the ink of a predetermined color is sucked into the image portion of the printing plate sheet 34 and the ink attached to the non-leached portion is wiped off, the back surface of the printing plate sheet 34 is not shown on the circumferential surface of the roller body 42. It is fixed by attaching it through a double-sided adhesive tape. Next, both support shafts 49 of the roller body 42 are connected to the bearing 5 of the support 41.
Attach to 0,50 so that it cannot be dropped off. Then, the N in the roller body 42 rotatably mounted on the support 41 is
When the pole permanent magnet 51 is located at the uppermost portion of the upper plate portion 47, the S-pole permanent magnet 52 is fixed to the uppermost portion.
Is restricted in free rotation so as to maintain its posture.

Accordingly, the printing plate sheet 34 is previously placed at a predetermined position at the lower end of the circumference of the roller body 42 in FIG. If the edge 34a is fixed by attaching it so that the edge 34a is located, the printing start position can be easily fixed. In this case, on the side surface of the roller body 42,
When a mark (not shown) for positioning the front edge 34a of the printing sheet 34 is engraved or the like, the user can use the front edge of the printing sheet 34 at the corresponding mark to be attached. If the sticking operation is performed with the position of the printing plate 34a, the printing plate sheet 34 is prevented from being set at an incorrect position.

Next, as shown in FIG. 6, the front end of the printing medium 46 such as a postcard placed on the upper surface of the printing table 40 is set so as to abut against the front surface of the stopper piece 45, and one of the supports 41 is set. The side surface (the outer surface of the upper plate portion 47) is
44, and then the roller 41
Is rotated in the direction of arrow A shown in FIG.

In this way, when the roller body 42 starts rotating, the rotation is heavy due to the magnetic attraction between the N-pole permanent magnet 51 and the S-pole permanent magnet 52 on the upper plate 47 side. However, when the N-pole permanent magnet 51 on the roller body 42 side deviates from the facing position of the S-pole permanent magnet 52, the rotation of the roller body 42 becomes light. Further, as the roller body 42 rotates, the location of the S-pole permanent magnet 53 on the outer periphery of the roller body 42 is changed to the S-pole permanent magnet 52 on the upper plate portion 47 side.
In the position facing the above, magnetic repulsion acts in reverse to the above,
The rotation of the roller body 42 becomes lighter.

In this way, the printing surface of the printing plate sheet 34 and the printing medium 46 come into contact with each other.
The printing surface of the printing plate sheet 34 and the printing medium 4
6 The two do not shift due to friction with the upper surface, and the ink coming out of the ink bleeding portion 24 corresponding to the image portion of the printing plate sheet 34 is pressed by the pressing force from the support member 42 so as to follow the image portion. The shape is printed.

When the roller body 42 makes substantially one revolution, the magnetic attraction force acts as described above, and the lower end of the roller body 42
Since the printing start position of the printing plate sheet 34 is reliably located and the position becomes immobile, the printing start position in the next printing operation can be executed accurately without being disturbed. Instead of the above embodiment, the permanent magnet 5 of one magnetic pole (for example, N pole) is provided on the circumferential surface of the roller body 42.
On the other hand, a pair of permanent magnets (not shown) of the other magnetic pole (for example, N pole) are provided on both sides of the inner surface of the upper plate portion 47 with the permanent magnet 52 of the S pole (for example) fixed therebetween. May be fixed over the circumferential range. Further, it goes without saying that the poles of the magnet may be set to be opposite to each other in the above embodiments.

Further, a roller body 42 is rotatably mounted on a pair of left and right brackets (not shown) projecting from the printing table 40, and the roller body 42 is rotated by a rotating handle mounted on the one bracket. It is good also as a structure to make it.

[0034]

As described above, in the printing apparatus according to the first aspect of the present invention, ink bleeding corresponding to the image area is formed on the surface of the porous sheet having open cells and impregnable with ink. A rotatable roller body for supporting the back surface of a printing plate sheet capable of forming a non-ink bleeding portion corresponding to a portion other than the image portion, and a support for rotatably supporting the roller body And an outer peripheral surface of the roller body,
A magnet made up of a pair of magnetic poles attracting each other at opposite positions is fixed to the support.

According to this configuration, at a position where the magnet of one magnetic pole fixed to the outer peripheral surface of the roller body and the magnet of the other magnetic pole on the support side face each other, the roller body is attracted by the magnetic attraction of both magnetic poles. Is restricted in free rotation so as to maintain its posture. Therefore, in this state, even if the roller body is rotatable with respect to the support member, the stopped state can be maintained such that a specific point on the outer peripheral surface of the roller body becomes the lower end. If the printing plate sheet is fixed at (fixed position) such that one edge serving as the printing start position is positioned, the printing start position can be easily fixed. Effect.

The invention described in claim 2 is the first invention.
In the printing apparatus described in the above, the magnet of the one magnetic pole is fixed to a part of the peripheral surface of the roller body, and the magnet of the other magnetic pole is a part of the support that covers the upper part of the peripheral surface of the roller body. The magnet is fixed so as to face the one magnet at almost the uppermost part. Therefore, it is on the side opposite to the position of the magnet of the one magnetic pole fixed to the roller body,
It is extremely easy to set the predetermined position at the lower end of the circumference of the roller body 42 as the printing start position, and by positioning the end of the printing medium at this fixed printing start position, the printing start position of the printing medium is On the other hand, it is extremely easy to align with the printing start position such as the start edge of the printing plate sheet, and when printing the image area neatly on the same place of many print media such as New Year's postcard printing work Labor and attention can be eliminated.

In particular, when a printing plate for ink of a different color is replaced and mounted on the roller body for multi-color printing, the printing start position on the printing medium does not shift. There is no print defect such as the position being shifted or being excessively overlapped, and an effect is obtained that a clear print result can be obtained. Further, according to a third aspect of the present invention, in the printing apparatus according to the second aspect, an inner peripheral surface of the support is formed on a peripheral surface separated by a substantially equal distance from a peripheral surface of the roller body. On either side of the circumferential surface of the roller body with the magnet of the one magnetic pole interposed therebetween, the magnet of the other magnetic pole is appropriately fixed over the circumferential range, or on the inner circumferential surface of the support, On both sides of the magnet of the other magnetic pole, the magnet of one magnetic pole is appropriately fixed over the circumferential range.

With this configuration, when the rotation phase of the roller body with respect to the supporting member changes so that the repulsive force acts on each other from the state where the suction force does not act on each other,
After that, the rotation of the roller body becomes light, and the effect that the printing operation can be made lighter is achieved. According to a fifth aspect of the present invention, in the printing apparatus according to any one of the first to fourth aspects, the roller body is manually driven to rotate.

Also in this case, it is easy to make the printing start position of the printing plate on the roller body constant, so that
Since the positional accuracy at the time of printing is not deviated, there is an effect that the printing result becomes beautiful and the printing operation of a large number of sheets can be extremely easily performed.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view of a stamp unit with a movable lid opened.

FIG. 2 is a schematic side sectional view showing the stamp unit with a movable lid closed.

3A is a perspective view of a stamp substrate, FIG. 3B is a cross-sectional view of a state in which an original sheet, a transparent sheet, and a stamp substrate are superposed, and FIG. 3C is a cross-sectional view showing a light irradiation state; ,
(D) is a sectional view of a state where the stamp substrate is separated from the transparent sheet.

FIG. 4 is a perspective view of a printing plate sheet.

FIG. 5 is a perspective view of a printing apparatus.

FIG. 6 is a side view of the printing apparatus.

FIG. 7 is a sectional view of a roller body and a support.

8 is a sectional view taken along line VIII-VIII in FIG. 7;

9 is a sectional view taken along line IX-IX of FIG. 7;

FIG. 10 is a side view showing a state where a roller body is mounted on the support.

[Explanation of symbols]

 Reference Signs List 3 printing section 7 bottomed case 34 printing plate 40 printing table 41 support 42 roller body 46 print medium 47 upper plate section 49 support shaft 50 bearing section 51 permanent magnet of one magnetic pole 52 permanent magnet of other magnetic pole 53 other Permanent magnet

Claims (5)

[Claims] An ink exuding portion corresponding to an image portion and a non-ink exuding portion corresponding to a portion other than the image portion are formed on the surface of a porous sheet having open cells and impregnable with ink. A rotatable roller body for supporting the back surface of the printing plate sheet, and a support for rotatably supporting the roller body, wherein the outer peripheral surface of the roller body and the support are A magnet comprising a pair of magnetic poles attracting each other at opposite positions. 2. The magnet of the one magnetic pole is fixed to a part of the peripheral surface of the roller body, and the magnet of the other magnetic pole is a part of a portion of the support that covers the upper part of the peripheral surface of the roller body. The printing apparatus according to claim 1, wherein the printing apparatus is fixed so as to face the one magnet at a substantially uppermost portion. 3. An inner peripheral surface of the support member is formed on a peripheral surface separated from the peripheral surface of the roller body by a substantially equal distance, and a magnet of the one magnetic pole on the peripheral surface of the roller body is provided. 3. The printing apparatus according to claim 2, wherein the magnets of the other magnetic poles are fixed to the both sides across the circumferential range as appropriate. 4. An inner peripheral surface of the supporting member is formed on a peripheral surface separated from the peripheral surface of the roller body by a distance substantially equal to the peripheral surface of the roller body. 3. The printing apparatus according to claim 2, wherein the magnets of the magnetic poles are appropriately fixed over a circumferential range. 5. The apparatus according to claim 1, wherein said roller body is manually driven to rotate.
The printing device according to any one of the above.