GB2202186A - Printing stencil - Google Patents
Printing stencil Download PDFInfo
- Publication number
- GB2202186A GB2202186A GB08705874A GB8705874A GB2202186A GB 2202186 A GB2202186 A GB 2202186A GB 08705874 A GB08705874 A GB 08705874A GB 8705874 A GB8705874 A GB 8705874A GB 2202186 A GB2202186 A GB 2202186A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stencil
- printing
- printing drum
- metallic film
- along
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N1/00—Printing plates or foils; Materials therefor
- B41N1/24—Stencils; Stencil materials; Carriers therefor
- B41N1/248—Mechanical details, e.g. fixation holes, reinforcement or guiding means; Perforation lines; Ink holding means; Visually or otherwise detectable marking means; Stencil units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
- B41L29/00—Devices for attaching printing elements or formes to supports
- B41L29/02—Devices for attaching printing elements or formes to supports magnetic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
- B41L29/00—Devices for attaching printing elements or formes to supports
- B41L29/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
- B41L29/14—Clamping devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Printing Plates And Materials Therefor (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
At least one edge of a printing stencil is provided along at least a portion of its length with a strip of ferromagnetic material whereby it may be held to a magnetic region of a printing cylinder. As shown (Fig. 1) the strip 4 extends along the leading edge and prevents it from riding up off the (conventional) retaining pins. It may, in the alternative, constitute the sole stencil retainer. Other embodiments are described in which further strips are uncorporated along other edges of the stencil. <IMAGE>
Description
PRINTING STENCIL WITH
FERROMAGNETIC METALLIC FILM
PIECE PROVIDED AT LEAST TO ITS
MOUNTING EDGE FOR MAGNETIC
ATTRACTION TO PRINTING DRUM
BACKGROUND OF THE INVENTION
The present invention relates to a printing stencil, and more particularly relates to such a printing stencil, which particularly is
equipped with an improved edge mounting portion.
In the prior art, there have been proposed various types of
printing stencil. In Japanese Utility Model Laying Open Publication
Serial No. 58-6704 (1983), for example, there is disclosed a printing
stencil which comprises a rectangular stencil main body and a
reinforced mounting portion which is attached along an edge of said
stencil main body and is provided with mounting holes. In its intended use, this stencil is mounted around the outer peripheral cylindrical surface of a printing drum of a printing machine by the engagement holes of the reinforced stencil mounting portion thereof being engaged over corresponding engagement pins provided as projecting radially outwards at appropriate positions on the printing drum.
With such a printing stencil thus engaged to such a printing drum, when the printing process is to be performed, printing ink is supplied from within the printing drum through many small holes which open to its outer cylindrical surface, said ink thus being supplied to lie between said printing drum outer cylindrical surface and the stencil (which of course is perforated). Thus, this ink serves to adhere and engage the stencil to said printing drum outer cylindrical surface, but however at the reinforced mounting portion of said stencil, which is typically not perforated, the engagement between said stencil and said printing drum outer cylindrical surface is provided only by such engagement pins engaging into such engagement holes.Since this engagement is not extremely secure, and particularly has a defect with regard to the possibility of said stencil mounting portion coming off from said engagement pins and becoming loose, there is a risk of such looseness causing a collision between said stencil mounting portion and another portion of the printing machine. Particularly, in some printing machines, such as the one proposed in Japanese Utility Model
Publication Serial No. 60-23176 (1985) which it is not hereby intended to admit as prior art to the present application except to the extent in any case mandated by applicable law, there may be provided a stencil removal pawl for peeling off a used stencil from the printing drum, subsequently to the printing process.Such a stencil removal pawl is of course retracted during the printing process and is only thereafter extended so as to engage and peel away the stencil mounting portion which typically is the leading edge portion of said stencil with respect to the direction of rotation of the printing drum; but, during the printing process, in the undesirable event that as outlined above said leading edge stencil mounting portion should become loose from the engagement pins of the printing drum and should come away from said printing drum, even although said stencil removal pawl is retracted, it could nevertheless happen that said leading edge stencil mounting portion might come into engagement with said retracted stencil removal pawl, and this would typically cause the stencil to be improperly peeled away from the printing drum during the printing process, leading to a jamming of the printing machine and inadvertent cessation of printing action.
Now, as a remedy for such a problem, in order to prevent such loosening and coming off of said leading edge stencil mounting portion from said engagement pins 6f said printing drum, it might be conceived of to provide a stencil holding on plate to the printing drum assembly.
Alternatively, it might be conceived of to make the heads of the engagement pins of the printing drum larger than their body portions, i.e. larger than the engagement holes of the stencil. Again, as a third possibility, it might be conceived of to make the engagement pins of the printing drum to be like bridges, loops, or staples, and to provide the holes in the stencil mounting portion as slots for being snapped over such engagement bridges or loops.
Although with these concepts the coming off of the stencil mounting portion from the printing drum may be prevented, they are attended with their own problems. The mounting process of the stencil to the printing drum tends to become difficult and cumbersome, and in some of the above concepts an extra member such as a stencil holding plate is required. Furthermore, a relatively large tension force is generated in the material of the stencil mounting portion adjacent to the engagement holes formed the rein which are engaged over the engagement pins, and this runs a risk of tearing the material of said stencil mounting portion around said engagement holes, which could be a proximate cause, again, of loosening and coming off of said stencil mounting portion from the printing drum.
SUMMARY OF THE INVENTION
The inventors of the present invention have considered the various problems detailed above relating to fixing a stencil mounting portion to the periphery of a printing drum of a printing machine.
Accordingly, it is the primary object of the present invention to provide a printing stencil, which avoids the problems detailed above.
It is a further object of the present invention to provide such a printing stencil, which can be easily and securely attached by its stencil mounting portion to the periphery of a printing drum of a printing machine, for performing stencil printing.
It is a further object of the present invention to provide such a printing stencil, which prevents loosening and coming off of its stencil mounting portion from such a printing drum.
It is a further object of the present invention to provide such a printing stencil, which is not unduly liable to tearing around engagement holes formed in its stencil mounting portion, during a stencil printing process.
It is a further object of the present invention to provide such a printing stencil, which does not require a printing machine to which it is to be fitted to be unduly complicated.
It is a further object of the present invention to provide such a printing stencil, which is not liable to cause jamming of a printing machine to which it is fitted, during the stencil printing process.
It is a further object of the present invention to provide such a printing stencil, which does not necessarily require the provision of such mounting pins on the printing drum of a stencil printing machine on which it is desired to use said stencil.
It is a further object of the present invention to provide such a printing stencil, which allows printing efficiency to be enhanced.
According to the most general aspect of the present invention, these and other objects are attained by a printing stencil, comprising a mounting edge and a piece of ferromagnetic metallic film provided on said mounting edge.
According to such a printing stencil as specified above, when it is used in conjunction with a printing drum of a printing machine which has a magnetic portion on its outer peripheral surface, since the piece of ferromagnetic metallic film provided on said stencil mounting edge is magnetically attracted to said magnetic portion of said printing drum, thereby said stencil mounting edge is closely and reliably attached to the outer peripheral surface of the printing drum, and detachment of said stencil mounting edge portion from said printing drum is avoided. The stencil mounting edge may be the leading edge of the stencil, with regard to the direction of rotation of the printing drum. And the piece of ferromagnetic metallic film may be provided substantially all along said mounting edge of said stencil, or on the contrary may have gaps in its run therealong.
If the printing drum of the printing machine is additionally provided with one or more engagement pins which engage with engagement holes provided in said stencil mounting edge portion, then the stencil will be attached to said printing drum not only by the magnetic attraction between said piece of ferromagnetic metallic film but also by the engagement of said mounting pins with said mounting holes.In such a case, the tension in the material of the stencil adjacent to said mounting holes formed in its said mounting edge portion is reduced substantially as compared with the prior art; and, further, since said piece of ferromagnetic metallic film naturally also - serves for reinforcing said mounting edge portion of said stencil around said engagement holes formed therein, the mechanical strength of said mounting edge portion of said stencil is enhanced, and the tearing of said mounting edge portion of said stencil is further impeded.
If, thus, the stencil is attached to the printing drum of the printing machine by these two means, then circumferential shifting of said stencil around the printing drum, during the printing process, is positively avoided. Further, in such a case, the engagement pins provided to the printing drum may be simple columnar pins (or may have some other simple cylindrical shape), and they may serve simply for locating the stencil mounting edge portion with respect to the printing drum in the planes tangential to the printing drum at their bases, rather than also being required to prevent the stencil mounting edge portion from coming away from the printing drum in the direction radial thereto as was the case in the various possible constructions adumbrated above.And the number of such engagement pins, further, may be minimized, in the above specified structure according to the present invention.
Further, such engagement pins may be only as high as the thickness of the stencil mounting edge portion (presumably plus a small amount of allowance), and thereby the height of such engagement pins provided to the printing drum can be drastically reduced as compared to the case of printing machines for use with other types of stencil.
This means that the spring loaded travel of such a stencil removal pawl for peeling off a used stencil from the printing drum, if provided, may be much less than insuch other printing machines, and this is beneficial with regard to improving the responsiveness of action of such a pawl. Further, the spring loaded travel of a press roller which typically could be used for biasing such a stencil removal pawl also can be reduced, which is similarly beneficial with regard to improving the responsiveness of action of such a roller.
According to a particular specialization of the present invention, the above and other objects may more particularly be accomplished by such a printing stencil as first specified above, further comprising an edge opposite to said mounting edge and a piece of ferromagnetic metallic film provided on said opposite edge. This opposite edge may typically be the trailing edge of the stencil. Further, according to another particular specialization of the present invention, the above and other objects may more particularly be accomplished by such a printing stencil as specified above, further comprising edges joining between said mounting edge and said opposite edge and pieces of ferromagnetic metallic film provided on said joining edges. In this case, said joining edges are typically the side edges of said stencil.And, in such a case, said various pieces of ferromagnetic metallic film may substantially surround said stencil by being provided substantially along all of the edges Thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described with respect to the preferred embodiments Thereof, and with reference to the illustrative drawings appended hereto, which however are provided for the purposes of explanation and exemplification only, and are not intended to be limitative of the scope of the present invention in any way, since this scope is to be delimited solely by the accompanying claims.With relation to the figures, spatial terms are to be understood as referring only to the orientation on the drawing paper of the illustrations of the relevant parts, unless otherwise specified; like reference numerals, unless otherwise so specified, denote the same parts and so on in the various figures relating to one preferred embodiment, and like parts and so on in figures relating to different preferred embodiments; and:
Fig. 1 is a perspective view of a first preferred embodiment of the stencil of the present invention, which is provided with a ferromagnetic metallic film material piece along its leading edge portion or mounting portion, only;
Fig. 2 is a longitudinal sectional view through said first preferred embodiment stencil of Fig. 1;
Fig. 3 is a schematic transverse sectional view taken through a printing drum of a printing machine which has said first preferred embodiment stencil of Figs. 1 and 2 wrapped around it;;
Fig. 4 is similar to Fig. 1 which related to the first preferred embodiment, and is a perspective view of a second preferred embodiment of the stencil of the present invention, which is provided with a ferromagnetic metallic film material piece along its trailing edge portion, as well as with a ferromagnetic metallic film material piece along its leading edge portion or mounting portion as was the first preferred embodiment stencil of Figs. 1 and 2;
Fig. 5 is similar to Fig. 3 which related to the first preferred embodiment, and is a schematic transverse sectional view taken through a printing drum of a printing machine which has said second preferred embodiment stencil of Fig. 4 wrapped around it;;
Fig. 6 is similar to Figs. 1 and 4 which related to the first and second preferred embodiments respectively, and is a perspective view of a third preferred embodiment of the stencil of the present invention, which is provided with ferromagnetic metallic film material pieces along its side edge portions, as well as with a ferromagnetic metallic film material piece along its trailing edge portion and with another ferromagnetic metallic film material piece along its leading edge portion or mounting portion, as was the second preferred embodiment stencil of Fig. 4; and:
Fig. 7 is a schematic perspective view, showing a printing drum of a printing machine which is in the act of having said third preferred embodiment stencil of Fig. 6 wrapped around it.
DESCRIPTION OF THE PREFERRED
EMBODIMENTS
The present invention will now be described with reference to the preferred embodiments Thereof, and with reference to the figures.
The First Preferred Embodiment
Figs. 1 through 3 relate to the first preferred embodiment of the printing stencil of the present invention.
Construction
In this first preferred embodiment of the printing stencil of the present invention, which is shown in perspective view in Fig. 1 and in longitudinal sectional view in Fig. 2, the reference numeral 1 generally denotes this stencil as a whole, while 2 is a main body portion thereof and 4 is a piece of ferromagnetic metallic film material which is extended along a leading edge of the main body 2 of the stencil 1 and is bonded to one side of said leading edge of said main stencil body portion 2 by means of a layer 3 of adhesive or the like.In this shown first preferred embodiment, further, a backing sheet 5 is layered over the rear side of the main stencil body 2, i.e. the side opposite to the
ferromagnetic metallic film material piece 4, and the leading edges of
said backing sheet 5 and said main stencil body portion 2 are secured together by means of another layer 6 of adhesive or the like. It is contemplated, as will be particularly described later, That, when this printing stencil 1 is mounted on a stencil drum of a stencil printing machine, this backing sheet 5 will be removed from the main stencil body 2, except for the leading edge portion 6b of said backing sheet 5 which will remain attached by means of the adhesive layer 6 to the main stencil body 2.This leading edge portion 6b of the backing sheet 5 is delimited from the main body portion thereof by a line 6a of perforations, so that when appropriate said main body portion of said backing sheet 5 can be detached from this leading edge portion thereof which remains attached by the adhesive layer 6 to the leading edge portion of the main stencil body portion 2, with no substantial difficulty. Thus, at the leading edge of the stencil 1 as a whole (the right edge in Figs. 1 and 2) there is constituted a mounting portion 7, by the superposition of the ferromagnetic metallic film material piece 4, the leading edge ofthe main stencil body portion 2, and the leading edge portion 6b of the badking sheet 5, together with the adhesive layers 3 and 6.Through this mounting portion 7 there are in this first preferred embodiment of the printing stencil of the present invention pierced a plurality (in fact, three) of through holes 8. These through holes 8 are positioned in an asymmetric arrangement with respect to the longitudinal direction of the stencil 1, so as to prevent inadvertent
reverse mounting of said stencil 1 to a printing drum of a printing machine.
The ferromagnetic metallic film material piece 4 may be a sheet
of ferrous metal which is from about 25 to about 30 microns in
thickness. In any case, said film material piece 4 should be formed of
a material which is strongly attracted by a magnet, i.e. of a magnetic - material; and hence from the point of view of this specification it can
be assumed to be metallic and ferromagnetic.
Application
Now, when this stencil 1 as described above according to the
first preferred embodiment of the present invention is to be used for
stencil printing, as schematically shown in transverse cross sectional
view in Fig. 3, said stencil 1 is wrapped around the outer peripheral
cylindrical surface of a printing drum 20 which is incorporated in a
stencil printing machine, not otherwise shown. This printing drum 20
is provided with a strip 21 of magnetic material laid into, along, or
just behind its outer peripheral surface, and this magnetic material
strip 21 extends along a generator of said printing drum 20.Further, a
plurality (in fact three in this application of this first preferred
embodiment type stencil) of columnar mounting pins 22 are mounted
along the portion of said printing drum 20 incorporating said magnetic
material strip 21, in positions therealong corresponding to the positions
of the through holes 8 along the mounting portion 7 of the stencil 1.
Thus, the shown first preferred embodiment of the printing stencil of the present invention is mounted to the printing drum 20, when it is desired so to do in order to perform a printing operation, by the leading edge portion of said stencil 1, which is its said mounting portion 7, being approached towards the magnetic material strip 21, so that the pins 22 projecting from the printing drum 20 enter into the through holes 8 formed through said stencil mounting portion 7. Then, as said stencil mounting portion 7 is laid against the magnetic material strip 21, the ferromagnetic metallic film material piece 4 incorporated the rein is strongly attracted by said magnetic material strip 21 and snaps thereagainst and thereafter is held thereto by the action of magnetic force.This results in the leading edge portion of said stencil 1, i.e. its said mounting portion 7, being securely and positively clamped to and along the generator of the printing drum 20 along which said magnetic material strip 21 extends. As a further beneficial feature of this first preferred embodiment of the printing stencil of the present invention, since the pins 22 are provided and in this state of the subject apparatus have entered into the through holes 8 of the stencil mounting portion 7, thereby said pins 22 further serve positively to locate said stencil mounting portion 7 against the printing drum 20 and prevent said stencil mounting portion 7 from slewing sideways, or from being dragged around the printing drum 20 in its circumferential direction during the printing process.
Further, the tension in the material of the stencil 1 adjacent to the through holes 8 is reduced substantially as compared with the prior art, and the tearing of said stencil mounting portion 7 is impeded; and, yet further, since the ferromagnetic metallic film material piece 4 naturally also serves for reinforcing said stencil mounting portion 7 around said through holes 8, the mechanical strength of said stencil mounting portion 7 is enhanced, and the tearing of said stencil mounting portion 7 is even more impeded.
If, thus, the stencil 1 is attached to the printing drum 20 by these two means, then circumferential shifting of said stencil 1 around the printing drum 20, during the printing process, is positively avoided.
Further, as is the case in this first preferred embodiment of the stencil of the present invention, the mounting pins 22 may be provided as simple columnar pins, and they may serve simply for locating the stencil mounting portion 7 with respect to the printing drum 20 in the planes tangential to said printing drum 20 at their bases, rather than also being required to prevent the stencil mounting portion 7 from coming away from the printing drum 20 in the direction radial thereto, since this job is performed by the magnetic attraction of the magnetic material strip 21 for the ferromagnetic metallic film material piece 4.
Thereby, the number of the mounting pins 22 may be minimized.
Further, such mounting pins 22 may be only substantially as high as the thickness of the stencil mounting portion 7, and thereby the height of such mounting pins 22 provided to the printing drum 20 can be drastically reduced as compared to the case of printing machines for use with other types of stencil. This means that the spring loaded travel of any stencil removal pawl (not particularly shown) for peeling off a used stencil 1 from the printing drum 20 if provided may be much less than in such other printing machines, and this is beneficial with regard to improving the responsiveness of action of such a pawl.
Further, the spring loaded travel of a press roller (also not particularly shown) which typically could be used for biasing such a stencil removal pawl also can be reduced, which is similarly beneficial with regard to improving the responsiveness of action of such a roller.
The Second Preferred Embodiment
The second preferred embodiment of the printing stencil of the present invention is shown in Fig. 4, which is a perspective view thereof similar to Fig. 1 with respect to the first preferred embodiment. In this figure, parts and holes and the like which correspond to analogous parts and holes and the like of the first preferred embodiment are denoted by reference numerals like to those utilized in the figures relating to said first preferred embodiment.
This printing stencil 1 has, in addition to the ferromagnetic metallic film material piece 4 which is provided along its leading edge or stencil mounting portion 7 in the same manner as was provided for the first preferred embodiment, another ferromagnetic metallic film material piece 9 which is provided along its trailing edge, which is the edge thereof to the left in Fig. 4.Corresponding to this, in the printing drum 20 of the printing machine on which it is intended to perform a printing process by using this stencil 1, there is provided, not only the strip 21 of magnetic material laid into, along, or just behind its outer peripheral surface along a generator of said printing drum 20 corresponding to where the leading edge portion of the stencil 1 is desired to be held to said printing drum 20 during the printing process as was The case with the first preferred embodiment described above, but also there is provided another similar strip 23 of magnetic material laid into, along, or just behind the outer peripheral surface of said printing drum 20 along a generator thereof corresponding to where the trailing edge portion of the stencil 1 is desired to be held to said printing drum 20 during the printing process.Again in this application of this second preferred embodiment stencil, a plurality of columnar mounting pins 22 are mounted along the portion of said printing drum 20 incorporating the leading edge magnetic material strip 21, in positions therealong corresponding to the positions of the through holes 8 along the mounting portion 7 of the stencil 1.
Thus, the shown second preferred embodiment of the printing stencil of the present invention is mounted to this printing drum 20, when it is desired so to do in order to perform a printing operation, by the leading edge portion of said second preferred embodiment stencil 1, which is its said mounting portion 7, being as before approached towards the magnetic material strip 21, so that the pins 22 projecting from the printing drum 20 enter into the through holes 8 formed through said stencil mounting portion 7. As before, as said stencil mounting portion 7 is laid against the magnetic material strip 21, the ferromagnetic metallic film material piece 4 incorporated therein is strongly attracted by said magnetic material strip 21 and snaps thereagainst and thereafter is held thereto by the action of magnetic force. This results in the leading edge portion of said stencil 1, i.e.
its said mounting portion 7, being securely and positively clamped to and along the generator of the printing drum 20 along which said magnetic material strip 21 extends; and, as before, further benefit is provided by the pins 22 in this state of the subject apparatus entering into the through holes 8 of the stencil mounting portion 7, thereby serving further positively to locate said stencil mounting portion 7 against the printing drum 20 and to prevent said stencil mounting portion 7 from slewing sideways, or from being dragged around the printing drum 20 in its circumferential direction during the printing process.
And next, after the leading edge portion 7 of the stencil 1 has thus been engaged to the printing drum 20, as said printing drum 20 is subsequently rotated in the direction shown in Fig. 5 by an arrow the stencil 1 is progressively wrapped around the peripheral cylindrical surface of said printing drum 20, until the ferromagnetic metallic film material piece 9 on the trailing edge of said stencil 1 comes to be approached towards the trailing side magnetic material strip 23, so that, as said ferromagnetic metallic film material piece 9 is laid against said magnetic material strip 23, it is strongly attracted by said magnetic material strip 23 and snaps thereagainst and thereafter is held thereto by the action of magnetic force.This results in the trailing edge portion of said stencil 1 being securely and positively clamped to and along the generator of the printing drum 20 along which said trailing edge side magnetic material strip 23 extends; and thereby not only is the stencil 1 more securely held to the printing drum 20 than in the case of the first preferred embodiment of the stencil of the present invention described above, but also in particular the trailing edge portion of the stencil 23 is sealed against the possible oozing out of printing ink due to squeezing action against the stencil 1 urging such printing ink in the trailing direction of the printing process, which is a perennial problem associated with such drum type stencil printing, i.e.
is the so called trailing ooze problem.
Otherwise, the same functions and advantages are available with this second preferred embodiment of the printing stencil of the present invention, as were available with the first preferred embodiment, and accordingly further detailed description thereof will be eschewed in the interests of brevity of explanation.
The Third Preferred Embodiment
The third preferred embodiment of the printing stencil of the present invention is shown in Fig. 6, which is a perspective view thereof similar to Fig. 1 with respect to the first preferred embodiment and Fig. 4 with respect to the second preferred embodiment. In this figure, parts and holes and the like which correspond to analogous parts and holes and the like of the first and second preferred embodiments are denoted by reference numerals like to those utilized in the figures relating to said first and second preferred embodiments.This printing stencil 1 has, in addition to the ferromagnetic metallic film material piece 4 which is provided along its leading edge or stencil mounting portion 7 in the same manner as was provided for the first and second preferred embodiments, and in addition to the other ferromagnetic metallic film material piece 9 which is provided along its trailing edge in the same manner as was provided for the second preferred embodiment, further left and right side ferromagnetic metallic film material pieces 10 provided along its left and right sides as well.Thereby, the entire periphery of the stencil 1 is in fact surrounded by ferromagnetic metallic film material, in this third preferred embodiment of the stencil of the present invention; however, this is not to be taken as limitative of the present invention, but on the contrary as a useful specialization thereof.
Corresponding to this, in the printing drum 20 of the printing machine on which it is intended to perform a printing process by using this stencil 1, not only is there provided the strip 21 of magnetic material laid into, along, or just behind its outer peripheral surface along a generator of said printing drum 20 corresponding to where the leading edge portion of thé stencil 1 is desired to be held to said printing drum 20 during the printing process as was the case with the first and second preferred embodiments described above, and not only is there also provided another similar strip 23 of magnetic material laid into, along, or just behind the outer peripheral surface of said printing drum 20 along a generator thereof corresponding to where the trailing edge portion of the stencil 1 is desired to be held to said printing drum 20 during the printing process as was the case with the second preferred embodiment described above, but further there are provided left and right side strips 24 of magnetic material laid into, along, or just behind the outer peripheral surface of said printing drum 20 along circumferential lines therearound corresponding to where the side edge portions of the stencil 1 are desired to be held to said printing drum 20 during the printing process.Again in this application of this third preferred embodiment stencil, a plurality of columnar mounting pins 22 are mounted along the portion of said printing drum 20 incorporating the leading edge magnetic material strip 21, in positions therealong corresponding to the positions of the through holes 8 along the mounting portion 7 of the stencil 1.
Thus, the shown third preferred embodiment of the printing stencil of the present invention is mounted to this printing drum 20, when it is desired so to do in order to perform a printing operation, by the leading edge portion of said third preferred embodiment stencil 1, which is its said mounting portion 7, being as before approached towards the magnetic material strip 21, so that the pins 22 projecting from the printing drum 26 enter into the through holes 8 formed through said stencil mounting portion 7. As before, as said stencil mounting portion 7 is laid against the magnetic material strip 21, the ferromagnetic metallic film material piece 4 incorporated therein is strongly attracted by said magnetic material strip 21 and snaps thereagainst and thereafter is held thereto by the action of magnetic force.This results in the leading edge portion of said stencil 1, i.e.
its said mounting portion 7, being securely and positively clamped to and
along the generator of the printing drum 20 along which said magnetic material strip 21 extends; and, as before, further benefit is provided by the pins 22 in this state of the subject apparatus entering into the through holes 8 of the stencil mounting portion 7, thereby serving further positively to locate said stencil mounting portion 7 against the printing drum 20 and to prevent said stencil mounting portion 7 from slewing sideways, or from being dragged around the printing drum 20 in its circumferential direction during the printing process.
And next, after the leading edge portion 7 of the stencil 1 has thus been engaged to the printing drum 20, as said printing drum 20 is rotated in the direction shown in Fig. 5 by an arrow, the stencil 1 is progressively wrapped around the peripheral cylindrical surface of said printing drum 20, and during this process the left and right side ferromagnetic metallic film material pieces 10 are progressively wrapped against the left and right side strips 24 of magnetic material provided on the printing drum, and are strongly attracted by said left and right side magnetic material strips 24 and are pulled thereagainst and thereafter are held thereto by the action of magnetic force.This results in the side edge portions of said stencil 1 being securely and positively clamped to and along the circumferential lines around the printing drum 20 along which said side edge magnetic material strips 24 extend; and thereby not only is the stencil 1 more securely held to the printing drum 20 even than in the case of the second preferred embodiment of the stencil of the present invention described above (and a fortiori said stencil 1 is held even more securely than in the case of the first preferred embodiment), but also in particular these side edge portions of the stencil 23 are sealed against the possible sideways oozing out of printing ink due to squeezing action against the stencil 1 during the printing process, which is another perennial problem associated with such drum type stencil printing, i.e. is the so called elbow ooze problem.
This wrapping on action continues until the ferromagnetic metallic film material piece 9 on the trailing edge of the stencil 1 comes to be approached towards the trailing side magnetic. material strip 23, so that, as said ferromagnetic metallic film material piece 9 is laid against said magnetic material strip 23, it is strongly attracted by said magnetic material strip 23 and snaps thereagainst and thereafter is held thereto by the action of magnetic force.This trailing edge gripping action, which is per se the same as in the case of the second preferred embodiment, results in the trailing edge portion of said stencil 1 being securely and positively clamped to and along the generator of the printing drum 20 along which said trailing edge side magnetic material strip 23 extends;; and thereby the stencil 1 is more securely held to the printing drum 20 than in the case of the first preferred embodiment of the stencil of the present invention described above, and also, as in the case of the second preferred embodiment of the stencil of the present invention described above, the trailing edge portion of the stencil 23 is sealed against the possible oozing out of printing ink due to squeezing action against the stencil 1 urging such printing ink in the trailing direction of the printing process, which is a perennial problem associated with such drum type stencil printing, i.e.
is secured against the so called trailing ooze problem.
Otherwise, the same functions and advantages are available with this third preferred embodiment of the printing stencil of the present invention, as were available with the first and second preferred embodiments, and accordingly again further detailed description thereof will be eschewed in the interests of brevity of explanation.
Conclusion
This printing stencil is improved by the ingenious yet inexpensive provision of a ferromagnetic metallic film material piece at least at its mounting edge, and hence the construction is relatively simple and the provision is economical.
It is acceptable, according to the principle of the present invention, if the ferromagnetic metallic film material piece is in fact present only at portions of the edge portion or portions of the stencil to which it is provided, rather than being continuous along said edge portion or portions as was the case in the - preferred embodiments disclosed above. In other words, a ferromagnetic metallic film material piece with gaps in it may be quite sufficient for providing the advantages of the present invention, in certain circumstances.
Further, the provision of the through holes 8 in the stencil, and of the corresponding mounting pins 22 on the printing drum 20, is not essential for the present invention, and, in the context of a particular application, if the magnetic attraction between the ferromagnetic metallic film material piece mounted on the stencil and the magnetic material portions of the printing drum is sufficient for providing proper force for holding the stencil to the printing drum without allowing said stencil to move relative to said printing drum during the printing process, then said mounting pins 22 and said through holes 8 can be omitted, thus simplifying the construction and making the mounting of the stencil to the printing drum relatively easier.
Although the present invention has been shown and described in terms of the preferred embodiments thereof, and with reference to the appended drawings, it should not be considered as being particularly limited thereby, since the details of any particular embodiment, or of the drawings, could be varied without, in many cases, departing from the ambit of the present invention. Accordingly, the scope of the present invention is to be considered as being delimited, not by any particular perhaps entirely fortuitous details of the disclosed preferred embodiments, or of the drawings, but solely by the scope of the accompanying claims, which follow.
Claims (14)
1. A printing stencil, comprising a mounting edge and a piece of
ferromagnetic metallic film provided on said mounting edge.
2. A printing stencil according to claim 1, wherein said mounting edge is the leading edge of said stencil.
3. A printing stencil according to claim 1, wherein said piece of ferromagnetic metallic film is provided substantially all along said mounting edge of said stencil.
4. A printing stencil according to claim 1, wherein said piece of ferromagnetic metallic film is provided substantially continuously along said mounting edge of said stencil.
5. A printing stencil according to any one of claims 1 through 4, further comprising an edge opposite to said mounting edge and a piece of ferromagnetic metallic film provided on said opposite edge.
6. A printing stencil according to claim 5, wherein said opposite edge is the trailing edge of said stencil.
7. A printing stencil according to claim 5, wherein said piece of ferromagnetic metallic film is provided substantially all along said opposite edge of said stencil.
8. A printing stencil according to claim 5, wherein said piece of ferromagnetic metallic film is provided substantially continuously along said opposite edge of said stencil.
9. A printing stencil according to claim 5, further comprising edges joining between said mounting edge and said opposite edge and pieces of ferromagnetic metallic film provided on said joining edges.
10. A printing stencil according to claim 9, wherein said joining edges are the side edges of said stencil.
11. A printing stencil according to claim 9, wherein said pieces of ferromagnetic metallic film are provided substantially all along said side edges of said stencil.
12. A printing stencil according to claim 9, wherein said pieces of ferromagnetic metallic film are provided substantially continuously along said side edges of said stencil.
13. A printing stencil according to claim 12, wherein said various pieces of ferromagnetic metallic film substantially surround said stencil by being provided substantially along all of the edges Thereof.
14. A printing stencil substantially as hereinbefore described with reference to, and as illustrated in, Fig.l .to 3; or Figs. 4 and 5; or Figs. 6 and 7 of the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08705874A GB2202186A (en) | 1987-03-12 | 1987-03-12 | Printing stencil |
| DE19873708840 DE3708840A1 (en) | 1987-03-12 | 1987-03-18 | PRINTING MATRICE WITH AT LEAST THE FERROMAGNETIC METAL PIECE PROVIDED ON ITS EDGE FOR MAGNETICALLY ATTRACTION TO A PRESSURE ROLLER |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08705874A GB2202186A (en) | 1987-03-12 | 1987-03-12 | Printing stencil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8705874D0 GB8705874D0 (en) | 1987-04-15 |
| GB2202186A true GB2202186A (en) | 1988-09-21 |
Family
ID=10613829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08705874A Withdrawn GB2202186A (en) | 1987-03-12 | 1987-03-12 | Printing stencil |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3708840A1 (en) |
| GB (1) | GB2202186A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0403227A1 (en) * | 1989-06-13 | 1990-12-19 | Crosfield Electronics Limited | Registration apparatus |
| GB2274623A (en) * | 1993-01-27 | 1994-08-03 | Lin Pac Containers Int | Mounting printing masters on cylinders. |
| US5671669A (en) * | 1994-10-24 | 1997-09-30 | Riso Kagaku Corporation | Stencil conveying means adapted to convey a stencil sheet parallel to the axis of a printing drum |
| US5716048A (en) * | 1995-03-28 | 1998-02-10 | Optronics International Corporation | Variable mask and universal vacuum drum |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB753279A (en) * | 1953-06-15 | 1956-07-18 | Reidar Stroemme | Improvements in or relating to means for attaching flexible printing plates to a printing bed or -cylinder |
| GB972794A (en) * | 1962-08-24 | 1964-10-14 | Wilhelm Ritzerfeld | Improvements in or relating to rotary duplicating machines,methods of making printedcopies thereby and printing master sheets for use therewith |
| US3670646A (en) * | 1970-10-09 | 1972-06-20 | Grace W R & Co | Magnetically securable printing plate |
| US3714692A (en) * | 1971-06-28 | 1973-02-06 | Magna Graphics Corp | Coating mat |
| US3745626A (en) * | 1971-12-27 | 1973-07-17 | Magna Graphics Corp | Coating roll |
| GB2016373A (en) * | 1978-01-30 | 1979-09-26 | Continental Gummi Werke Ag | Rollers for printing machines |
-
1987
- 1987-03-12 GB GB08705874A patent/GB2202186A/en not_active Withdrawn
- 1987-03-18 DE DE19873708840 patent/DE3708840A1/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB753279A (en) * | 1953-06-15 | 1956-07-18 | Reidar Stroemme | Improvements in or relating to means for attaching flexible printing plates to a printing bed or -cylinder |
| GB972794A (en) * | 1962-08-24 | 1964-10-14 | Wilhelm Ritzerfeld | Improvements in or relating to rotary duplicating machines,methods of making printedcopies thereby and printing master sheets for use therewith |
| US3670646A (en) * | 1970-10-09 | 1972-06-20 | Grace W R & Co | Magnetically securable printing plate |
| US3714692A (en) * | 1971-06-28 | 1973-02-06 | Magna Graphics Corp | Coating mat |
| US3745626A (en) * | 1971-12-27 | 1973-07-17 | Magna Graphics Corp | Coating roll |
| GB2016373A (en) * | 1978-01-30 | 1979-09-26 | Continental Gummi Werke Ag | Rollers for printing machines |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0403227A1 (en) * | 1989-06-13 | 1990-12-19 | Crosfield Electronics Limited | Registration apparatus |
| US5162926A (en) * | 1989-06-13 | 1992-11-10 | Crossfield Electronic Ltd. | Registration method |
| GB2274623A (en) * | 1993-01-27 | 1994-08-03 | Lin Pac Containers Int | Mounting printing masters on cylinders. |
| US5671669A (en) * | 1994-10-24 | 1997-09-30 | Riso Kagaku Corporation | Stencil conveying means adapted to convey a stencil sheet parallel to the axis of a printing drum |
| US5716048A (en) * | 1995-03-28 | 1998-02-10 | Optronics International Corporation | Variable mask and universal vacuum drum |
| US5758874A (en) * | 1995-03-28 | 1998-06-02 | Optronics International Corporation | Universal vacuum drum and mask |
| US5865433A (en) * | 1995-03-28 | 1999-02-02 | Optronics International Corp. | Variable mask and universal vacuum drum |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3708840A1 (en) | 1988-09-29 |
| GB8705874D0 (en) | 1987-04-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |