JP4859010B2 - Plate cylinder and stencil printing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate cylinder on which a stencil sheet having been subjected to plate making is wound and used for stencil printing, and a stencil printing apparatus including the plate cylinder.
[0002]
[Prior art]
A scanner device that optically reads a document image and converts it into a digital image signal, a plate making device capable of performing digital perforation on a heat-sensitive stencil sheet based on the digital image signal, and a pre-made stencil sheet on its outer peripheral surface A printing drum (plate cylinder) having an ink supply device wound inside, a paper feeding device that separates printing paper one by one and sequentially conveys it to the printing unit, and a printing drum that conveys the conveyed printing paper 2. Description of the Related Art A stencil printing apparatus having a printing pressure device that presses against a printing drum to form a printed image and a paper discharge device that peels a printed sheet from a printing drum and discharges and stacks the paper on a paper discharge tray is already well known.
[0003]
In such a printing drum (plate cylinder), a pre-made stencil sheet is wound around the outer peripheral surface of the printing drum and is rotationally driven. However, the front end of the stencil paper is accurately and reliably and firmly part of the outer peripheral surface of the printing drum. As a means for locking the paper, a “base paper tip clamping device” is widely adopted.
[0004]
Conventionally, most of the base paper tip clamping devices that have been used so far are in close contact with the clamp plate made of a thin metal plate that can be opened and closed around an axis parallel to the drum axis direction, and the thin metal plate by magnetic force. It is comprised as a combination with the clamp base by the magnetic material provided in the. And the front-end | tip part of a stencil paper is guide | pinched between these clamp plates and a clamp base, and it clamps using the attractive force and frictional force by magnetic force (for example, patent documents 1, 2) reference).
[0005]
The outline will be described with reference to FIG. In the conventional printing drum structure, as shown in FIG. 11, an ink supply roller 101 for supplying ink is fixedly provided on the inner peripheral surface of a cylindrical drum-shaped plate cylinder 100. Inevitably, the plate cylinder 100 must be provided on the outer peripheral surface side. However, the conventional base paper tip clamping device 102 composed of the clamp plate 103 and the clamp base 104 requires a required thickness dimension of 8 to 10 mm due to its structure. This is because the thickness of the magnet plate is necessary for strong clamping, and the thickness of the magnet and the magnet mounting substrate and the thickness of the clamp plate 103 are added, resulting in this thickness. It is what.
[0006]
A pressure roller 107 serving as a printing pressure unit provided for pressing the printing paper 105 against the outer peripheral surface of the plate cylinder 100 (the pre-made stencil sheet 106) is turned on in synchronization with the rotation of the plate cylinder 100. -Contact / separation control is performed so as to turn off. That is, as described above, the rocking contact / separation operation over the 8-10 mm-thick base paper tip clamping device 102 is performed every rotation of the plate cylinder 100.
[0007]
Here, the pressure roller 107 performs a swinging contact / separation operation so as to apply a strong printing pressure to the plate cylinder 100 that rotates at a high speed. The generation of a loud noise such as “don-don” has been a problem for some time.
[0008]
As a countermeasure against such problems,
(1) A method for reducing the collision energy against the plate cylinder by reducing the weight of the pressure roller.
(2) Method to reduce the collision energy against the plate cylinder by smoothing the contact / separation movement of the pressure roller (smooth the cam curve)
(3) A method of using a printing cylinder having a concave portion in which the concave portion is made to correspond to the clamp portion by one rotation of the plate cylinder.
Etc. have been proposed.
[0009]
[Patent Document 1]
JP 59-96983 A
[Patent Document 2]
Japanese Utility Model Publication No. 61-31830
[0010]
[Problems to be solved by the invention]
However, in the method (1), there is a limit to the weight reduction because there is a thickness necessary to ensure the elasticity of the rubber and the strength is difficult to be deformed with a strong printing pressure. . In addition, there is an essential problem that the effect of noise reduction is small even if it is lightened a little.
[0011]
In the method (2), if the pressure roller is moved smoothly, the distance from the base paper leading edge clamp position to the printing pressure on position is inevitably increased, and the required print image length is reduced. In order to ensure this, there is a problem that the drum outer diameter of the plate cylinder is increased, the margin length of the leading edge of the base paper is increased, and the base paper is wasted. FIG. 12 is an explanatory diagram schematically showing this state by developing the outer peripheral surface of the plate cylinder 100 horizontally. The curve (a) shows the normal contact / separation swinging operation of the pressure roller 107. FIG. 12B shows a state in which the contact / separation swinging operation is smoothed, and it can be seen that the margin length at the leading edge of the base paper is increased from the normal dimension La to Lb (in FIG. 12, 108 is the plate cylinder 100). The mesh screen 109 adhered on the outer peripheral surface of the plate cylinder 109 indicates an opening portion actually used for printing in the plate cylinder 100).
[0012]
According to the method (3), it is possible to reduce the contact / separation swing distance of the printing cylinder to the very minimum regardless of the thickness of the base paper tip clamping device, and as a result, the effect of reducing the printing pressure noise is great. It can be said. However, it is necessary to use a printing cylinder having the same diameter as that of the plate cylinder, and the stencil printing apparatus itself is increased in size. In addition to the cost of the printing cylinder, the cost of the drive system is also required. There is a bug that becomes.
[0013]
In the past, there has never been a fundamental proposal for reducing printing noise by thinning the mechanism itself for locking the leading edge of the base paper.
[0014]
An object of the present invention is to reduce printing noise and to reduce the outer diameter of the drum cylinder drum by fundamental measures that can make the mechanism itself for locking the leading edge of the base paper as thin as possible. It is.
[0015]
In addition, an object of the present invention is to realize the above object simply and at low cost.
[0016]
In addition, an object of the present invention is to ensure that the leading edge of the stencil sheet can be locked.
[0017]
In addition, an object of the present invention is to prevent damage at the time of peeling of a stencil sheet with a leading end locked and a decrease in locking ability after peeling.
[0018]
In addition, an object of the present invention is to make it possible to ensure both the securing performance of the stencil sheet and the ease of the stripping and discharging process.
[0019]
In addition, an object of the present invention is to enable the locking ability to be maintained over a long period of time.
[0020]
[Means for Solving the Problems]
A plate cylinder according to a first aspect of the present invention includes a metal thin plate disposed on a part of the outer peripheral surface of the drum along the drum axial direction, and a surface of the metal thin plate. A part on the outer peripheral surface of the drum And a pressure sensitive adhesive layer that detachably locks the leading edge of the stencil sheet after stencil printing, and the metal thin plate can be opened and closed around an axis parallel to the drum axis. And a displacement support mechanism that reciprocally supports the drum circumferential direction, and the stencil sheet has a structure in which a thermoplastic resin film and a 100% synthetic resin fiber porous support are bonded and bonded together. It is locked by sticking the quality support side to the pressure-sensitive adhesive layer.
[0021]
Accordingly, by providing a base paper tip locking mechanism having an adhesive layer on the surface that detachably locks the tip of the stencil stencil sheet, a pair of plate materials such as a combination of a clamp plate and a clamp base is provided. Since it is only necessary to lock the stencil stencil sheet to the adhesive layer on the surface without providing it, it can be made extremely thin and can be used for rocking contact of a pressing body such as a printing cylinder in order to give a strong printing pressure. Even if the moving operation is performed, the distance of the swing change is very small, so that the noise at the time of collision can be greatly reduced. At the same time, since it is possible to reduce the useless dimension portion where the printing pressure provided before and after the base paper front end locking mechanism cannot be applied, the drum outer diameter of the plate cylinder can be reduced, which is effective for downsizing of the stencil printing apparatus. Become.
[0029]
Also, as a stencil paper, 100% synthetic resin fiber is used for the porous support. No Since the porous support side is attached to the pressure-sensitive adhesive layer, the thermoplastic resin film part is easily broken when the stencil sheet is peeled off and remains on the pressure-sensitive adhesive layer side. Occurrence can be prevented. Also The A part of the fine fibers of the natural fiber that constitutes the base remains on the surface of the pressure-sensitive adhesive layer side, the adhesive strength of the pressure-sensitive adhesive layer is reduced, and the locking performance as the base paper tip locking mechanism is reduced. Problems can also be avoided.
[0031]
More With respect to the base paper leading edge locking mechanism using a combination of a metal thin plate and an adhesive layer, the metal thin plate is supported by a displacement support mechanism so that it can be opened and closed around an axis parallel to the drum axis and reciprocally moved in the drum circumferential direction. Thus, the leading end of the stencil sheet that has been locked can be peeled off from the adhesive layer of the stencil sheet leading edge locking mechanism by the opening / closing rotation operation of the metal thin plate and the reciprocating movement operation in the circumferential direction of the drum. The plate cylinder can be peeled off from the front end side of the stencil sheet without reversely rotating the plate cylinder during the process.
[0036]
Claim 2 The stencil printing apparatus according to the invention described in claim 1 The plate cylinder described above and a stencil paper stencil sheet that is supplied with the stencil sheet, and the leading end of the stencil sheet stencil sheet is pressed against the adhesive layer of the stencil sheet front end locking mechanism on the plate cylinder. A member, a drive source for driving the base paper tip pressing member in the pressing direction, a pressing body for pressing the stencil stencil sheet wound around the drum outer surface of the plate cylinder against the printing paper, and the plate cylinder And an ink supply mechanism that supplies ink to the inner peripheral surface of the plate cylinder, and the metal plate is removed from the drum outer surface by the displacement support mechanism when discharging the stencil stencil wound around the drum outer surface of the plate cylinder. A peeling plate discharging apparatus that rotates in the open direction and moves and displaces in the drum circumferential direction along with the rotation of the plate cylinder so as to peel in order from the rotation direction front end side of the plate cylinder.
[0037]
Therefore, it is claimed as a plate cylinder 1 Since the described plate cylinder is used, the leading end of the stencil sheet that has been locked is peeled off from the adhesive layer of the stencil sheet tip locking mechanism by opening and closing the metal sheet and reciprocating in the circumferential direction of the drum. Therefore, the stencil sheet can be peeled from the front end side without reversely rotating the plate cylinder during the peeling and discharging process.
[0040]
DETAILED DESCRIPTION OF THE INVENTION
First One embodiment will be described with reference to FIGS. This embodiment shows an application example to a digital thermal type stencil printing apparatus.
[0041]
FIG. 1 is a longitudinal front view schematically showing the overall internal structure of the stencil printing apparatus. The stencil printing apparatus is configured to have both functions of a digital copying machine, and includes a scanner 1 that reads a document image. The scanner 1 includes a pressure plate 2 that can be freely opened and closed on an upper surface, and an ADF 3 that automatically and sequentially feeds a plurality of documents one by one. However, when making a plate based on image data transmitted from a personal computer or the like, the scanner 1 is not essential, and the stencil printing apparatus may be configured to have only a printing machine function.
[0042]
In the main body of the stencil printing apparatus, there is provided a plate cylinder 4 that is driven to rotate clockwise. A plate making device 5, a paper feeding device 6, a printing pressure device 7, and a peeling plate discharging device 8 are provided around the plate cylinder 4 where a necessary print image length is secured. An ink supply mechanism 9 is provided inside the plate cylinder 4.
[0043]
The plate making apparatus 5 is a device for making a master by heating and melting and punching a stencil sheet 10 in accordance with image data read by the scanner 1 or image data input from the outside. The stencil sheet is wound in a roll shape. A holding shaft 11 that holds 10, a thermal head 12 that includes a plurality of heating elements and heat-melts and punches the stencil sheet 10, a platen roller 13 that is rotated by a stepping motor and presses the stencil sheet 10 against the thermal head 12, and a thermal head The stencil sheet 10 is formed by a cutter 14 that cuts the stencil sheet 10 heated and melt-pierced by a predetermined length. The stencil sheet 10a that has been heat-melted and perforated by the thermal head 12 is cut into a predetermined length by a cutter 14 to produce a pre-made stencil sheet 10a (end-of-plate making). It is wound on the outer peripheral surface of the trunk 4.
[0044]
The sheet feeding device 6 includes a sheet feeding roller 17 that sequentially feeds the printing sheets 16 stacked on the sheet feeding table 15 one by one from the topmost sheet, a conveyance roller 18, and a registration roller that takes a printing timing to the printing unit. 19 or the like. Reference numeral 20 denotes a paper size detection sensor.
[0045]
The printing pressure device 7 is detachable from the outer peripheral surface of the plate cylinder 4 (more specifically, the pre-made stencil sheet 10a wound around the outer peripheral surface of the plate cylinder 4), and presses the printing paper 16 against the pre-made stencil sheet 10a. The press roller 21 as a pressing body and a displacement mechanism 22 for performing the contact / separation operation of the press roller 21 are configured.
[0046]
The stripping and discharging apparatus 8 includes a pair of rollers 23 and 24 disposed in the vicinity of the plate cylinder 4 and a discharging box 25. Here, one of the rollers 23 is freely contactable / separated with the plate cylinder 4, and contacts the outer peripheral surface of the plate cylinder 4 and rotates in the opposite direction at the contact surface when peeling and discharging the plate. The stencil stencil sheet 10a is peeled off.
[0047]
Further, a transport device 27 that transports and discharges the printed printing paper 16 onto the paper discharge tray 26 is provided downstream of the printing pressure device 7 in the transport direction. 28 is a side fence and 29 is an end fence.
[0048]
The ink supply mechanism 9 is disposed at a minute interval between the ink pipe 30 that also serves as a holding shaft that rotatably holds the plate cylinder 4 and the inner peripheral surface of the plate cylinder 4 and rotates in the same direction as the plate cylinder 4. The ink roller 31 to be driven, the doctor roller 32 arranged with a small gap between the ink roller 31, the ink reservoir 33 having a substantially wedge-shaped cross section formed between these rollers 31, 32, etc. It is comprised by. As a result, ink is supplied through the ink pipe 30 by driving an ink pump (not shown), and the ink flows out from the plurality of ink holes 30 a formed in the ink pipe 30 and is stored in the ink reservoir 33. The ink accumulated in the ink reservoir 33 is supplied to the inner peripheral surface of the plate cylinder 4 by the rotation of the ink roller 31, and the ink oozes out from the perforated portion of the stencil stencil sheet 10 a and is printed on the printing paper 16. Printing is performed by transferring.
[0049]
Next, a structural example of the plate cylinder 4 will be described. FIG. 2 is a longitudinal front view showing a part of the plate cylinder 4 in an enlarged manner, and FIG. 3 is a longitudinal front view showing a part thereof in an enlarged manner. Basically, the plate cylinder 4 having a large number of apertures 41 and formed in the shape of a porous metal cylindrical drum is provided with a mesh screen 43 whose ends are bonded by an adhesive portion 42 on the outer peripheral surface thereof. Cover the plate cylinder opening area. In such a plate cylinder 4, it is located on the surface of the non-perforated portion 44 of the porous cylindrical drum, and is provided in such a manner that the adhesive layer 45 is directly exposed to the outside along the drum axial direction. A tip locking mechanism 46 is configured.
[0050]
Here, a double-sided adhesive tape as shown in FIG. 3 is used for the adhesive layer 45. That is, it is a tape structure having a front-side adhesive 48 and a back-side adhesive 49 on a PET film 47 as a base material, and is fixed by pasting the back-side adhesive 49 on the non-opening portion 44. Has been. On the other hand, as shown in FIG. 3, the stencil sheet 10 whose leading end is locked by the pressure-sensitive adhesive layer 45 is made of a thermoplastic resin film 50 and a porous film. No With a structure that is bonded to the base 51 The The side 51 is set to be attached to the surface-side adhesive 48.
[0051]
Further, as shown in FIG. 4, the plate cylinder 4 having such a surface-side pressure sensitive adhesive 48 is supplied with a plate-making stencil sheet 10a as shown in FIG. A pressing arm 53 as a base paper tip pressing member that is swingable around a support shaft 52 that presses the leading end of 10a onto the adhesive layer 45 on the plate cylinder 4, and is connected to a part of the pressing arm 53. A solenoid 54 as a drive source for driving the pressing arm 53 in the pressing direction, and a spring 55 connected to a part of the pressing arm 53 and biasing the pressing arm 53 in a direction away from the pressing direction. , Is provided. The pressing portion of the pressing arm 53 is provided with an elastic body 56 made of foamed rubber or the like for ensuring adhesion. Reference numerals 57 and 58 denote rollers arranged at the outlet of the plate making apparatus 5. Also, a blower fan 59 that blows an air current that guides the leading end side of the stencil stencil sheet 10 a conveyed toward the pressing arm 53 between the pressure-sensitive adhesive layer 45 (plate cylinder 4) and the pressing arm 53 is provided. Is provided.
[0052]
In such a configuration, the plate-making stencil sheet 10a made by the plate-making apparatus 5 is synchronized with the position of the adhesive layer 45 on the plate cylinder 4, and as shown in FIG. The paper is conveyed between 53. At this time, since the air flow blown by the blower fan 59 is blown against the front end portion of the stencil sheet 10a that has been made, the front end portion of the stencil sheet 10a that has been made has been sent out a predetermined amount without sticking to the adhesive layer 45. Stop. When the solenoid 54 is turned on at a predetermined timing, the pressing arm 53 swings around the support shaft 52, and the leading end portion of the stencil sheet 10a that has been made is pressed and brought into close contact with the adhesive layer 45. Thereby, the front-end | tip part of the stencil sheet 10a after making a plate will stick to the adhesive layer 45, and will be latched. At this time, since the elastic body 56 is interposed in the pressed portion, the adhesiveness of the front end portion of the stencil stencil sheet 10a to the pressure-sensitive adhesive layer 45 becomes more reliable. Thereafter, after the plate cylinder 4 is slightly rotated clockwise, the solenoid 54 is turned off, the pressing arm 53 is released from the plate cylinder 4 by the urging force of the spring 55, and the rotation of the plate cylinder 4 is continued. The stencil stencil sheet 10 a after the leading end is wound and closely adhered onto the mesh screen 43 by the ink existing on the outer peripheral surface of the plate cylinder 4.
[0053]
In this way, the leading end of the stencil sheet 10a after making the plate is detachably locked with the adhesive layer 45 on the outer peripheral surface of the plate cylinder 4 as shown in FIG. In this case, since the base paper leading edge locking mechanism 46 is simply constituted by the adhesive layer 45, it is not necessary to provide a pair of plate members unlike the conventional combination of the clamp plate and the clamp base, and it is extremely thin. be able to. Therefore, even if the press roller 21 is subjected to the rocking contact / separation operation in order to apply a strong printing pressure, the distance of the rocking change can be very small, so that the noise during the collision can be greatly reduced. . At the same time, since a useless dimension portion where the printing pressure provided before and after the base paper leading edge locking mechanism 46 cannot be applied can be reduced, the drum outer diameter of the plate cylinder 4 can be reduced, which is effective for downsizing the stencil printing apparatus. It becomes the target.
[0054]
By the way, the locked state of the front end portion of the stencil sheet 10a having been made by the adhesive layer 45 will be considered. In the present embodiment, as described above, the thermoplastic resin film 50 and the porous film No A stencil sheet 10a having a structure in which the base 51 is bonded and bonded. The The side 51 is set to be attached to the adhesive layer 45. Here, the back side adhesive 49 side is rarely peeled off once attached, but the front side adhesive 48 side is repeatedly peeled off after the new pre-made stencil sheet 10a is pasted. If the thermoplastic resin film 50 is attached to the pressure-sensitive adhesive layer 45 by any chance, the thermoplastic resin film 50 has a very thin thickness of about 1 to 2 μm, so it can be easily broken at the time of peeling. There is a problem. In this respect, in the present embodiment, as described above. To Since the case 51 side is attached to the adhesive layer 45, such a problem can be solved.
[0055]
Further, the porous of the stencil paper 10 No As the material, a material obtained by slightly mixing synthetic fibers with natural Japanese paper is usually used. However, in the case of such a material, when the stencil sheet 10a is peeled from the surface side adhesive 48 side in the peeling and discharging plate process, No A problem arises in that part of the fine fibers of the natural fibers constituting the base remains on the surface side adhesive 48 side. If such a phenomenon is repeated and accumulated many times, the adhesive force of the surface side adhesive 48 is lowered, and the locking performance as the base paper leading edge locking mechanism 46 is lowered.
[0056]
In this regard, in the present embodiment, the porous stencil sheet 10 is porous. No Also for the case 51, since 100% synthetic fiber that does not contain natural fiber is used, a problem that part of the microfiber remains on the surface side adhesive 48 side is less likely to occur. This is because in the case of synthetic fibers, the thickness is uniform and local separation hardly occurs.
[0057]
By the way, according to the base paper leading edge locking mechanism 46 using the pressure-sensitive adhesive layer 45 as in the present embodiment, as shown in FIG. In the direction (plane direction), even if it is pulled with a very strong force P1, strong holding ability can be exerted by strong adhesive force. On the other hand, when pulled in a direction substantially perpendicular to the surface of the adhesive layer 45, comparison is made. Even if it is the weak force P2, it has the characteristic that it peels easily.
[0058]
As a specific example, for example, a Scotch double-sided adhesive tape ST416 of Sumitomo 3M Co. having a width of 15 mm and a length of 300 mm is used as the adhesive layer 45 (double-sided adhesive tape), and a preport master m-80 is used as the stencil sheet 10. The experimental results show that the horizontal pulling force P1 is 10 kgf or more (a force that the stencil sheet 10 itself is likely to break), but the vertical pulling force P2 is about 200 gf at most.
[0059]
Therefore, in the case of the present embodiment, the stripping and discharging plate processing step can be easily realized by utilizing such a feature. Exfoliation processing which utilizes such a feature will be described with reference to FIG. The stencil sheet 10a that is adhesively wound on the outer peripheral surface of the plate cylinder 4 with ink has a blank portion 10b to which no ink is attached at the rear end opposite to the front end locking side. 4 is rotated in the reverse direction (counterclockwise), and as shown in FIG. 6 (a), the stencil sheet 10a is brought into contact with the plate cylinder 4 and rotated in the opposite direction at the contact portion. Is peeled in order from the rear end portion 10b side, and the peeling / conveying proceeds by the counterclockwise rotation of the plate cylinder 4 and the rotation of the rollers 23 and 24. When the pressure-sensitive adhesive layer 45 is finally reached, as shown in FIG. 6 (b), the stencil sheet 10a is peeled off in a direction perpendicular to the pressure-sensitive adhesive layer 45. The tip can be peeled off.
[0060]
Incidentally, FIG. 7 shows a schematic configuration example of the control system of the stencil printing apparatus of the present embodiment. The control system includes a control unit 61 having a computer configuration including a CPU, a ROM, and a RAM as main components, and the control unit 61 performs printing by the plate making device 5, the paper feeding device 6, the plate cylinder 4, the press roller 21, and the like. The part 62, the peeling plate removing device 8, the operation panel 63, and the like are connected.
[0061]
A control example of the peeling and discharging process of the present embodiment executed by the control unit 61 will be described with reference to a schematic flowchart shown in FIG. First, when the start key is pressed through the operation panel 63 or the like (Y in S1), the stencil sheet 10a that has been wound around the outer peripheral surface of the plate cylinder 4 in the previous printing process is executed (S2). ). Next, a plate making process for the stencil sheet 10 is executed based on the image data (S3), and a plate-feeding wrapping process for winding the pre-made stencil sheet 10a on the outer peripheral surface of the plate cylinder 4 is executed (S4). That is, the front end portion is pressed onto the pressure-sensitive adhesive layer 45 to be locked, and the portion after the front end portion is wound around the outer peripheral surface as the plate cylinder 4 rotates. Then, the printing paper 16 is fed while rotating the plate cylinder 4 and the press roller 21, and ink is supplied to perform printing on the printing paper 16 (S5). When printing of a predetermined number of sheets is completed (Y in S6), the current printing operation is completed, but the apparatus waits until the start key for the next printing is pressed (Y in S1). That is, the stencil sheet 10a wound around the outer peripheral surface of the plate cylinder 4 this time is left in the wound state until the plate feeding process for the next printing is performed. Such a series of processes in steps S1 to S6 is executed as a function of the peeling plate removal process control means.
[0062]
As described above, according to the present embodiment, the separation and stencil processing of the stencil stencil sheet 10a is performed under the condition that the next new stencil sheet stencil sheet feeding process is performed immediately thereafter. The pressure-sensitive adhesive layer 45 located on the surface can always be covered with the front end of the stencil sheet 10a. Therefore, when the pressure-sensitive adhesive layer 45 is exposed, paper dust or dust in the apparatus adheres to the adhesive force. Can be avoided, and the locking performance can be maintained over a long period of time.
[0063]
First A second embodiment will be described with reference to FIG. The same parts as those shown in the first embodiment are denoted by the same reference numerals, and description thereof is also omitted (the same applies to the following embodiments).
[0064]
In the above-described embodiment, the base paper tip locking mechanism 46 is configured by providing the adhesive layer 45 such as a double-sided adhesive tape directly on the non-opening portion 44 of the plate cylinder 4 itself. In the embodiment, the base paper leading edge locking mechanism 72 is configured by the metal thin plate 71 provided in the non-opening portion 44 region of the plate cylinder 4 and the adhesive layer 45 attached on the surface of the metal thin plate 71. . Here, the thin metal plate 71 is provided in an elongated shape parallel to the drum axis, and both ends thereof are fixed to the flange 73 of the plate cylinder 4 by screws 74. The pressure-sensitive adhesive layer 45 itself is the same as in the case of the first embodiment.
[0065]
According to the present embodiment, the metal thin plate 71 having the adhesive layer 45 previously bonded to the surface may be positioned and fixed to the non-opening portion 44 of the plate cylinder 4, and a separate member is required. The 45 pasting operation can be performed on the thin metal plate 71 and can be easily realized.
[0066]
First A third embodiment will be described with reference to FIG. In the present embodiment, as in the case of the second embodiment described above, the base paper leading edge locking mechanism 72 composed of the metal thin plate 71 and the adhesive layer 45 is configured, but the metal thin plate 71 is attached to the flange 73. The displacement support mechanism 75 is provided so as to be capable of opening / closing and turning around an axis parallel to the drum axis and reciprocating in the circumferential direction of the drum. That is, outside the flanges 73 at both ends of the plate cylinder 4, a support arm 77 having a length approximately equal to the plate cylinder radius that is rotatable and displaceable in the direction of arrow A around the drum center axis 76 is provided. Both ends of the thin metal plate 71 are supported by a clamper arm 79 that is rotatable about a support shaft 78 provided on the side. Here, the support shaft 78 is located on the rear end side of the thin metal plate 71 when viewed from the front end side of the stencil sheet 10a. The support shaft 78 opens and closes the thin metal plate 71 around an axis parallel to the drum axis. It is supposed to be rotatable. In addition, the support arm 77 that is rotatable and displaceable around the drum center axis 76 is reciprocally movable in the drum circumferential direction. Here, a gear 81 that is rotationally driven around a shaft 80 by a drive transmission mechanism (not shown) is provided on the support arm 77, and a partial gear portion that meshes with the gear 81 around the support shaft 78 of the clamper arm 79. 82 is formed. Further, a spring 83 that biases the support arm 77 in the clockwise direction is provided, and a stopper piece 84 that restricts the amount of movement of the support arm 77 in the clockwise direction is provided on the flange 73.
[0067]
In such a configuration, except during the peeling operation, the thin metal plate 71 is in a closed state in which it falls on the outer peripheral surface of the non-opening portion 44 of the plate cylinder 4 as shown in FIG. Then, by the winding process as described above, the stencil stencil sheet 10a is wound around the outer peripheral surface of the plate cylinder 4 in such a manner that the front end portion is stuck and locked to the adhesive layer 45 on the metal thin plate 71, and the printing operation is performed. To be served.
[0068]
Thereafter, when the stencil sheet 10a has been peeled and discharged, the drive mechanism (not shown) in the stencil printing apparatus holds the shaft 80 in a fixed direction in the direction of arrow B (counterclockwise) on the gear 81. A rotational driving force is applied. As a result, the clamper arm 79 is rotationally displaced in the direction of arrow C (clockwise) shown in FIGS. 10A and 10B, and the thin metal plate 71 supported by the clamper arm 79 is also separated from the outer peripheral surface of the plate cylinder 4. An open displacement operation is performed in such a state that it stands up. Finally, as shown in FIG. 10 (b), it is raised to a state substantially orthogonal to the outer peripheral surface. At this time, the front end portion of the stencil sheet 10 a is in a state of being stuck and locked on the adhesive layer 45 of the metal thin plate 71.
[0069]
In this way, the plate cylinder 4 is rotationally driven in the direction of arrow D (clockwise) as shown in FIGS. 10B and 10C with the clamper arm 79 open. Then, the stopper piece 83 is separated from the support arm 77, and at the same time, the stencil sheet 10a that is in close contact with the ink on the outer peripheral surface of the plate cylinder 4 is gradually separated. As shown in (c), the tip of the stencil sheet 10a is also peeled off gradually even at the adhesive layer 45 portion. In this way, when the metal thin plate 71 opens and moves on the outer peripheral surface of the plate cylinder 4, the front end side of the stencil sheet 10a can be peeled off from the adhesive layer 45 easily and with a small force. Can be in a state. As a result, the stencil sheet 10a can be peeled and discharged from the stencil sheet 10a not from the rear end side, but from the front end part side.
[0070]
【Effect of the invention】
According to the first aspect of the present invention, since the base paper front end locking mechanism having the adhesive layer on the surface for releasably locking the front end of the stencil stencil sheet, the combination of the clamp plate and the clamp base is provided. Thus, it is only necessary to lock the stencil stencil sheet to the surface adhesive layer without providing a pair of plate materials, and it can be configured to be extremely thin, such as a printing cylinder in order to give a strong printing pressure. Even if the pressing body swings and separates, the distance of the swing change is very small, so the noise at the time of collision can be greatly reduced, and at the same time, it is provided before and after the base paper tip locking mechanism Since a useless dimension portion to which no printing pressure can be applied can be reduced, the outer diameter of the drum of the plate cylinder can be reduced, which is effective for downsizing of the stencil printing apparatus.
[0074]
Also, as a stencil paper, 100% synthetic resin fiber is used for the porous support. No Since the porous support side is attached to the pressure-sensitive adhesive layer, the thermoplastic resin film part is easily broken when the stencil sheet is peeled off and remains on the pressure-sensitive adhesive layer side. Can be prevented, and The A part of the fine fibers of the natural fiber that constitutes the base remains on the surface of the pressure-sensitive adhesive layer side, the adhesive strength of the pressure-sensitive adhesive layer is reduced, and the locking performance as the base paper tip locking mechanism is reduced. Problems can also be avoided.
[0075]
More With respect to the base paper leading edge locking mechanism using a combination of a metal thin plate and an adhesive layer, the metal thin plate is supported by a displacement support mechanism so that it can be opened and closed around an axis parallel to the drum axis and reciprocally moved in the drum circumferential direction. As a result, the leading end portion of the stencil sheet that has been locked can be peeled off from the adhesive layer of the stencil sheet tip locking mechanism by the opening / closing rotation operation of the metal thin plate and the reciprocating movement operation in the circumferential direction of the drum. It is possible to peel from the front end side of the stencil sheet without reversely rotating the plate cylinder during the peeling and discharging process.
[0078]
Claim 2 According to the stencil printing apparatus of the invention described in claim 1 Since the described plate cylinder is used, the leading end of the stencil sheet that has been locked is peeled off from the adhesive layer of the stencil sheet tip locking mechanism by opening and closing the metal sheet and reciprocating in the circumferential direction of the drum. Therefore, the stencil sheet can be peeled from the front end side without reversely rotating the plate cylinder during the peeling and discharging process.
[Brief description of the drawings]
[Figure 1] First 1 is a longitudinal front view schematically showing an overall internal structure of a stencil printing apparatus according to an embodiment.
FIG. 2 is a longitudinal front view showing an enlarged part of a plate cylinder.
FIG. 3 is a longitudinal front view showing a part thereof in an enlarged manner.
FIG. 4 is a longitudinal sectional front view for explaining the winding operation of the leading edge of the base paper.
FIG. 5 is a longitudinal front view for explaining the characteristics of the pressure-sensitive adhesive layer.
FIG. 6 is a longitudinal front view showing a peeling operation.
FIG. 7 is a block diagram illustrating a schematic configuration example of a control system of the stencil printing apparatus.
FIG. 8 is a schematic flowchart showing a control example of the peeling and discharging plate process.
FIG. 9 First It is a vertical front view which shows the plate cylinder of 2nd embodiment.
FIG. 10 First It is a vertical front view which shows peeling operation | movement of 3rd embodiment in process order.
FIG. 11 is a schematic front view showing a configuration example of a conventional stencil printing apparatus.
FIG. 12 is a longitudinal front view for explaining a defect caused by the conventional method (2).
[Explanation of symbols]
4 edition cylinder
8 Peeling and discharging equipment
9 Ink supply mechanism
10 Stencil paper
10a Stencil-made stencil paper
16 Printing paper
21 Pressing body
44 Non-opening part
45 Adhesive layer
46 Base paper tip locking mechanism
47 Base material
50 Porous support
51 base
53 Pushing member
54 Drive source
71 sheet metal
72 Base paper tip locking mechanism
75 Displacement support mechanism

Claims (2)

A thin metal plate disposed on a part of the outer peripheral surface of the drum along the axial direction of the drum, and a front end portion of the stencil sheet that is provided on a part of the outer peripheral surface of the drum on the surface of the thin metal plate An adhesive layer for releasably locking the base paper, and a base paper tip locking mechanism.
A displacement support mechanism for supporting the metal thin plate so that the metal thin plate can be opened and closed around an axis parallel to the drum axis and reciprocally moved in the circumferential direction of the drum;
The stencil paper has a structure in which a thermoplastic resin film and a 100% synthetic resin fiber porous support are bonded and bonded, and the porous support side is locked by sticking to the pressure-sensitive adhesive layer.
Plate cylinder. A plate cylinder according to claim 1;
A swingable base paper tip pressing member that receives the supply of the stencil stencil sheet and presses the tip of the stencil stencil paper on the adhesive layer in the base paper tip locking mechanism on the plate cylinder;
A drive source for driving the base paper tip pressing member in the pressing direction;
A pressing body that presses a stencil sheet that has been pre-rolled around the drum outer surface of the plate cylinder against printing paper;
An ink supply mechanism that is provided in the plate cylinder and supplies ink to the inner peripheral surface of the plate cylinder;
At the time of discharging the stencil stencil sheet wound around the drum outer surface of the plate cylinder, the displacement supporting mechanism rotates the metal thin plate from the drum outer surface and moves and moves in the drum circumferential direction as the plate cylinder rotates. A peeling plate removing apparatus that peels in order from the rotation direction front end side of the plate cylinder,
A stencil printing apparatus comprising:

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