JP2001038997A - Rotary stencil plate making printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform plate making well on a print drum using a thermal head of original stencil sheet by providing means for supporting the circumferential wall, pressed from the outside by the heating element of a thermal head, from the inside while facing the heating element. SOLUTION: At a position in a print drum 10 facing the position where a ridge part 28a provided with the heating element of a thermal head 28 abuts against the circumferential wall 10d of the print drum, a roller 114 abutting selectively against the inner surface of the circumferential wall 10d is provided while being supported by a bracket 116 rotatably through a shaft 118. The bracket 116 is urged clockwise and the roller 114 normally separates from the circumferential wall 10d of the print drum. A pair of eccentric cams 12 engaging with the opposite end parts of the shaft 118 are turned selectively to bias the shaft 118 through the eccentric cams 12 and the roller 114 abuts against the circumferential wall 10d of the print drum. At the time of plate making, a print drum circumferential wall supporting means is constituted around the roller 114.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine, and more particularly, to a rotary stencil printing machine using a rotating printing drum and also for making a stencil sheet. Related.

[0002]

2. Description of the Related Art Stencil printing, invented by Edison in 1875 as punching wax paper with an electrically vibrating pen, was subsequently performed in 1894 by Shinjiro Horii to punch wax paper on a file file with an iron brush. Evolved into a transcript,
After World War II, with the development of synthetic resins, the method of heat-sensitive stencil printing was developed in which a heat-meltable resin film was heated and melted to make a plate. The hot-melt perforation in the image portion of the hot-melt resin film is based on the heat-meltable resin film of the heat-sensitive stencil paper on the image sheet formed by the ink which contains carbon component and absorbs infrared rays by light irradiation and generates heat. Layers were adhered to each other, and a method of irradiating a beam rich in infrared rays from above was performed.However, with the development of electronic technology, an image was digitally read or collected as a set of finer points than the original image. Creates an original image digitally on a computer without relying on the original image, and operates a thermal head that presses a row of fine electric heating elements against the heat-meltable resin film of heat-sensitive stencil paper based on electrical digital image information As a result, the stencil paper was made. A stencil printing apparatus using such a thermal head is disclosed in
No. 143679.

[0003] Further, the stencil making of the stencil paper by the thermal head is performed on the stencil paper wound around the printing drum on the printing drum using the peripheral wall of the printing drum as a stencil support. It has been proposed in Japanese Patent Application No. 61-191260.

[0004] Further, with the development of a technique for making a hole by a laser beam, it has been considered to make a stencil sheet by using a laser beam instead of a thermal head. However, the stencil sheet is substantially transparent, and the laser beam is applied to the stencil sheet. In a rotary stencil printing machine that performs printing by wrapping a stencil sheet around a printing drum, the printing drum is used once it is started. When the used stencil sheet is removed and a new stencil sheet is wound, the new stencil sheet is initially placed on the ink layer held along the peripheral wall of the printing drum. First, new stencil paper is wound around the printing drum, the back side is held by an ink layer having infrared absorption, and a laser beam is applied to this. By morphism, a rotary and to perform plate making of the stencil sheet stencil plate printing machine has been proposed At a JP 6-127106 at the printing drum.

On the other hand, in parallel with the above-mentioned developments in the stencil making method of stencil paper, various developments have also been made on the structure of the rotary stencil printing press. As described in Japanese Patent Application Laid-Open No. 57-51485, in order to improve the rising of a rotary stencil printing press using a printing drum and to improve the uniformity of a printed image, the peripheral wall forming a main part of the printing drum is woven with a wire. Or a perforated plate having the same degree of opening as the net material made or knitted, and effectively utilizing the fact that the peripheral wall of the printing drum has become a large flexible wall. , Japanese Patent Laid-Open No. 1-2047
As described in Japanese Patent Publication No. 81, the opening / closing control of the printing paper sandwiching region between the printing drum and the backing roller is performed by selecting the peripheral wall of the printing drum by the inking roller regardless of the movement of the axis of the backing roller. That is, the control is carried out by the target extrusion control.

[0006]

Problems to be Solved by the Invention
The technique of making a stencil sheet on a printing drum as proposed in US Pat. No. 91260 is based on a structure in which the printing drum has a considerably rigid structure as shown in FIGS. In this case, it is presumed that the execution can be performed without any trouble.
No. 485, the structure having a flexible peripheral wall, in particular, the opening / closing control of the printing paper sandwiching portion can be performed by controlling the extrusion of the peripheral wall of the printing drum by the ink applying roller as disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 1-204781. When a structure having such a flexible and flexible peripheral wall is employed, there is a problem that a stencil sheet cannot be practically made by making a plate on the peripheral wall of a printing drum by a thermal head.

That is, a new stencil sheet is first wound around a printing drum, and a stencil sheet is perforated while the stencil sheet is supported by the peripheral wall of the printing drum. Aside from the case where the stencil paper does not need to be provided with any substantial mechanical support from the back side in the process, when using a thermal head, heat is mainly transferred to the stencil paper by heat conduction from the heating elements of the thermal head. Therefore, the state of contact of the heat generating element of the thermal head with the stencil paper has a significant effect on the finish of the perforation, and even a slight bending of the peripheral wall of the printing drum causes unevenness in the size of the perforated hole. In a printing drum having a flexible peripheral wall as disclosed in Japanese Patent Application Laid-Open No. 1-204878, plate making by a thermal head on the peripheral wall of the printing drum is actually performed. It is those that can not be above adopted.

SUMMARY OF THE INVENTION The present invention addresses the above-mentioned problems and solves the above-mentioned problems. Therefore, when the printing drum has a flexible peripheral wall, the opening and closing control of the printing paper sandwiching region is controlled by the inking roller. In the structure of a stencil printing machine having a printing drum having a flexible peripheral wall as performed by selective extrusion control, stencil making of a stencil base paper by a thermal head on a printing drum is favorably performed. It is an object to provide a rotary stencil printing machine.

[0009]

According to the present invention, there is provided, in accordance with the present invention, a printing drum comprising a porous cylindrical peripheral wall and an inking roller abutting the peripheral wall of the printing drum from the inside thereof. Ink supply means for supplying ink to the peripheral wall of the drum from the inside thereof, stencil paper supply means for supplying stencil paper toward the peripheral wall of the printing drum, and peeling used stencil paper from the peripheral wall of the printing drum Plate discharging means for removing, a backing roller disposed outside the peripheral wall of the printing drum at a position facing the inking roller, and printing toward a sandwich region between the printing drum and the backing roller. Printing paper supply means for supplying paper, printing paper receiving means for receiving printed printing paper through the nip area, and around the peripheral wall of the printing drum A rotary stencil printing machine having a heating element having a heating element in contact with the wound stencil sheet and a thermal head for making the stencil sheet on the printing drum; A printing drum peripheral wall supporting means for supporting the peripheral wall, which is located inside the peripheral wall of the drum and is opposed to the heating element of the thermal head and pressed from the outside by the heating element, from the inside; This is achieved by a rotary stencil printing machine.

The present inventors have confirmed through various experiments that the stencil sheet made by the thermal head as described above can be used even when the stencil sheet is made by the thermal head on the peripheral wall of the flexible printing drum. If there is provided a printing drum peripheral wall support means which is inside the peripheral wall of the printing drum at the time of plate making and is opposed to the heating element of the thermal head and supports the printing drum peripheral wall pressed from the outside by the heating element from the inside, thermal transfer to the stencil sheet is provided. It is possible to ensure uniform contact of the head heating element, and even with the short-time heat generation of the thermal head heating element, the heat can be uniformly transferred to the stencil paper, and the thermal head on the printing drum It has been found that stencil making of stencil paper can be practically adopted.

If the stencil making of a stencil sheet by the thermal head on the printing drum can be practically adopted in this way, a path of multicolor stencil printing by the thermal head stencil sheet is opened. That is, as in the prior art, in the case of stencil printing, when the stencil sheet is wound around a printing drum after the stencil sheet is made, the stencil sheet after the stencil printing is placed on the printing drum no matter how high the accuracy of the stencil making. It is extremely difficult to wind a desired position from the beginning to the end with high precision. The stencil wrapping onto the printing drum is performed sequentially from the start end thereof, and it is not possible to adjust the left and right position in the reverse direction or in the middle. If there is a deviation in the front-rear position, the deviation extends to the position of the entire screen, and if there is a deviation in the dressing angle of the starting end of the base paper, the deviation gradually increases toward the end. Therefore, in multicolor printing, which requires accurate superposition of the printing of each color, obtaining an accurate and reproducible winding of a stencil sheet on a printing drum is the most difficult problem to overcome. Was. On the other hand, if it is possible to make a plate on a printing drum, this difficulty can be overcome at once.

The printing drum peripheral wall supporting means at the time of plate making according to the present invention is preferably a roller which rotates around a central axis as in the embodiment shown in the attached drawings, but other cross sections are also possible. It may be a sled-shaped member having a smooth convex curved surface or other means adapted to the purpose.

Further, the present invention relates to the above-mentioned Japanese Patent Application Laid-open No. Hei.
As described in No. 15, when the peripheral wall of the printing drum is not pressed radially outward from the inside by the inking roller, the peripheral wall of the printing drum is spaced apart from the peripheral surface of the backing roller so as not to contact with the outer peripheral surface. The function of sandwiching the printing paper between the peripheral wall of the printing drum and the backing roller is that a part of the peripheral wall pressed radially outward from the inside by the inking roller disappears the gap and flexibly biases. The present invention is particularly effective for a rotary stencil printing machine configured to be achieved by the above method.

Further, when the present invention is applied to multicolor printing, a plurality of drum units are provided by combining the printing drum, the ink supply means, and the printing drum peripheral wall support means at the time of plate making with a frame. Each one of the plurality of drum units sequentially cooperates with the common stencil sheet supply means, the plate discharge means, the thermal head, the printing paper supply means, the printing paper receiving means, and the back pressing roller to form multicolor. A rotary stencil printing machine may be configured to perform printing.

According to such a configuration, not only a particularly expensive thermal head but also many of the essential components of a rotary stencil printing machine for plate making and printing for each color are commonly used to perform multi-color stencil printing. Can be implemented.

Further, in this case, each of the plurality of drum units is supported by guide support means provided on a frame of a rotary stencil printing machine at a frame portion thereof, and the guide support means is provided with a plurality of guide support means. One of the drum units is supported at an operating position for performing stencil making and printing in cooperation with the stencil sheet supply means, the plate discharge means, the thermal head, the printing paper supply means, the backing roller, and the printing paper receiving means. And supporting the other drum units at storage positions arranged in parallel with the one drum unit, and moving each of these drum units from each of the operating position and the storage position to a position along the central axis of the printing drum. It is movably guided outward and is movably guided between the operating position and the storage position in a direction perpendicular to the center axis of the printing drum. It may be so that configuration.

Further, a plurality of the storage positions are provided,
The guide support means may be configured to guide each drum unit movably between the plurality of storage positions in a direction perpendicular to the central axis of the printing drum.

In this case, the drum unit includes a first pair of arms suspended from the outside of the printing drum at the position of one end on the back side when viewed from outside the printing drum, and the other end of the printing drum. And a third pair of arms suspending the second pair of arms at a position intermediate the first and second pair of arms. The supporting means has a rail groove for guiding the upper and lower ends of the first pair of arms, the second pair of arms, and the third pair of arms of the drum unit by suspending engagement. The rail groove is provided between a vertical rail groove that guides the drum unit out of the machine in a direction along a central axis of the printing drum from each of the operation position and the storage position, and between the operation position and the storage position. A lateral rail groove for guiding in a direction perpendicular to the central axis of the printing drum. .

Further, in this case, the third pair of arms may be arranged closer to the first pair of arms than the second pair of arms, thereby moving the drum unit out of the machine. When the drum unit is pulled out, the drum unit can be sufficiently pulled out of the machine while being stably held by the guide support means. After this state, the drum unit is grasped by hand and removed from the machine frame of the stencil printing machine.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention;

FIG. 1 is an exploded front view showing one embodiment of a rotary stencil printing machine according to the present invention, and FIG. 2 is an exploded side view thereof. FIG. 3 is a perspective view showing one more specific embodiment of the printing drum, the thermal head, and the printing drum peripheral wall support means at the time of plate making. In these figures, reference numeral 10 denotes a printing drum. The printing drum 10 has a pair of rigid annular members 10a, 10b forming both shaft ends.
Has a drum frame rigidly connected by a horizontal girder member 10c bridged therebetween, and a mesh material or a perforated plate having a rectangular shape spread on a plane is formed on both side edges of the annular member 1 by a circular member.
A porous cylindrical peripheral wall 10d that forms a main part of the printing drum is formed by being cylindrically bent in a state of being in sliding contact with the outer peripheral surfaces of Oa and 10b. One end of the mesh member or the perforated plate is fixed to the cross beam member 10c, and the other end portion is slidably mounted in the circumferential direction along the cross beam member 10c. The details of the structure of the printing drum are described in Japanese Patent Application Laid-Open No. 2-225078 filed by the same applicant as the present applicant. Further, a clamp 11 (FIG. 3) for attaching the leading end of the stencil sheet is provided on the horizontal girder member 10c. The clamp 11 shown in FIG. 3 has a structure proposed in Japanese Patent Application Laid-Open No. 11-5357 by the same applicant as the present applicant, and the clamp 11 has a shaft 1.
3, when it is rotated by approximately 180 ° from the open state shown in the figure, the plurality of elastic thin pieces 15 are pulled on the pedestal portion on which the magnet plate 17 is provided while eliminating the swelling thereof. The starting end of the stencil sheet is pressed down.

In the printing drum 10, a cylindrical peripheral wall 10d is provided.
Is provided with an inking roller 34 (FIG. 1) which comes into contact with the inner peripheral surface of the roller and supplies ink thereto. A doctor rod 35 is provided near the inking roller 34, and a wedge-shaped space formed between the inking roller and the doctor rod is supplied by an ink tube and an ink pump (not shown). The ink mass forms an ink mass 37. The ink tube, the ink pump, the inking roller 34, and the doctor rod 35 are all
And ink supply means for supplying ink to the inner peripheral wall thereof. These ink supply means integrally support these and support the printing drum 10 rotatably around its central axis in FIGS. A frame unit (not shown) (corresponding to 124 in FIG. 4 described later) assembles together with the printing drum 10 into one drum unit. Such a drum unit is removably mounted on a machine frame (not shown) of a rotary stencil printing machine. Japanese Patent Publication No. 62-28757 discloses a structure in which a drum unit and an ink supply unit are integrally combined with a printing machine frame as an integral unit.

On the outside of the printing drum, a backing roller 36 is provided in parallel with the printing drum. Opposing outer peripheral surfaces of the printing drum 10 and the backing roller 36 are adjacent to each other in a band-like band along each generatrix. And a nip area 38 for applying ink printed from a perforated portion of the stencil sheet wrapped around the printing drum 10 onto the printing paper by feeding the printing paper therebetween and forming a printing thereon. .

The back pressing roller 36 is also
It is rotatably supported about its own central axis. When the peripheral wall 10d of the print drum is not pressed radially outward from the inside by the ink applying roller 34, the peripheral wall 1
A gap is left between Od and the outer peripheral surface of the backing roller 36. The flexible peripheral wall 10d made of a mesh material or a perforated plate is radially outwardly directed by the inking roller 34 toward the backing roller 36 at the time of printing when the printing paper is passed through the sandwiching area 38 in a manner described later. The printing paper is pushed between the backing roller 36 by eliminating the gap in the sandwiching area 38. The details of the opening / closing control of the sandwiching region 38 in this manner are also described in the above-mentioned Japanese Patent Application Laid-Open No. 2-25078.

The printing drum 10, the inking roller 34, and the backing roller 36 are driven to rotate in synchronization with each other by an interlocking drive system (not shown). In the illustrated embodiment, the printing drum 10 and the backing roller 36 have the same diameter, and are driven in opposite directions at the same rotational angular velocity. A recess 40 is provided in a part of the outer peripheral surface of the backing roller 36 along the generatrix, and when the cross beam member 10c of the printing drum 10 passes through the sandwiching region 38 in this recess, it is received. It has become.

A printing paper supply means comprising a printing paper supply tray 42, a printing paper take-out roller 44, a printing paper feed roller pair 46, and the like is provided. In printing, the printing is performed in synchronization with the rotation of the printing drum 10 and the back pressing roller 36. The paper is supplied to the sandwiching area 38 one by one.
In the illustrated embodiment, the backing roller 36 includes a printing paper holding means described in Japanese Patent Application Laid-Open No. 4-361043 filed by the same applicant as the present applicant. The clamp 48 is provided on a part of the outer peripheral surface of the backing roller 36 along the generatrix and holds the leading end of the printing paper sent to the sandwiching region 38 on the backing roller 36, and the sandwiching region 38. In order to move the printing paper that has passed through while being held on the back-pressing roller 36, a pair of pressing rollers 50 for pressing both side edges of the printing paper onto the back-pressing roller 36 is included. In this case, after the leading end of the printing paper has passed under the pressing roller 50, the clamping device 4
8 is released from the backing roller 3 by the peeling claw 52.
6 and is received on the printing paper receiving tray 54.

Reference numeral 60 denotes a stencil sheet roll. A belt-shaped stencil sheet 62 drawn out from the stencil sheet roll is fed from a pair of stencil feed rollers 64 through a stencil guide device 66, and the leading end thereof is a cross beam member of the printing drum 10. 10c is attached by the above-mentioned clamp 11 and wound around the printing drum for a predetermined length by rotating the printing drum.
Is cut by

The used stencil sheet starts from the leading end attached to the cross beam member 10c of the printing drum 10 by the clamp 11, starts releasing the clamp, and then releases the printing drum 1.
The plate is discharged into the plate discharge box 69 by being guided by the plate discharge claw 65 and the plate discharge roller 67 with the plate discharge rotation of zero.

A thermal head 28 is provided opposite to the outer peripheral surface of the printing drum 10 and has a heating element having a heating element that selectively contacts the stencil sheet wound around the peripheral wall 10d of the printing drum. As shown in more detail in FIG. 3, the thermal head 28 is supported by a pair of arms 92 and 94 of a thermal head support frame 90, and the thermal head support frame 90 is used in a rotary stencil printing machine. A pair of brackets 96 and 9 are provided from a machine frame not shown.
8, the heating elements (not shown) provided in a line along the ridge portion 28a of the thermal head 28 as shown in the figure by rotating the shaft 100 around the shaft 100. The heating element is selectively moved between a position where the heating element is pressed against 10d and a position where the heating element is separated from the peripheral wall.

In the illustrated embodiment, the bracket 10 is attached to the lower end of one arm 94 of the thermal head support frame 90 by a machine frame (not shown) of the rotary stencil printing machine.
The other end of the tension coil spring 106, one end of which is locked by the hook 2 and the hook 104, is locked, so that the thermal head support frame 90 always has a ridge on which the heating elements of the thermal head 28 carried by the thermal head support frame 90 are arranged. The edge 28a is biased to a position where the edge 28a is pressed against the peripheral wall 10d of the printing drum. A lug 108 provided at the lower end of the arm 94 is oriented in a direction against a biasing force of a tension coil spring 106 by an eccentric cam 112 driven by a step motor 110 mounted on the machine frame (not shown). And the thermal head support frame 90 is rotated about the axis 100 in response thereto, so that the thermal head 28 is rotated in a direction to separate the ridge 28a from the peripheral wall 10d of the printing drum. Has become.

In the printing drum 10, the thermal head 2
8 at the position where the ridge line portion 28a provided with the heating element 8 opposes the position where it contacts the peripheral wall 10d of the printing drum.
A roller 114 that selectively contacts the inner surface of d is provided so as to be rotatably supported on a shaft 118 by a bracket 116. The bracket 116 is used for the printing drum 10.
Are pivotally supported about an axis 120 (FIG. 1) by a frame not shown. Bracket 1
16 is urged clockwise around the axis 120 as seen in FIG. 1 by a spring device (not shown), so that the roller 114 normally keeps the printing drum peripheral wall 10d.
More distant. When a pair of eccentric cams 122 engaged with both ends of the shaft 118 are selectively rotated through an operation mechanism not shown in detail in the drawing, the shaft 118 is rotated.
The roller 114 comes into contact with the inner surface of the peripheral wall 10d of the printing drum. Thus, the above-described printing drum peripheral wall support means at the time of plate making is constituted by the roller 114 as a main component.

A pitch pattern 56 (see FIG. 2; omitted in FIG. 3) is provided along one side edge of the printing drum 10, and a pitch pattern reading device 58 for optically reading this pitch pattern. Is provided at one end of the printing drum 10 at a distance from the outer peripheral surface thereof. By reading the pitch pattern 56 by the pitch pattern reading device 58, the rotation angle position of the printing drum 10 can be confirmed. However, such a pitch pattern or pitch pattern reading device is one embodiment, and the circumferential position on the print drum may be detected by the rotation angle position of the print drum, and any known position detecting means may be used for that purpose. Alternatively, a rotation angle detecting means may be used.

A document reading device 70 for copying and printing a document is provided above the printing drum 10. The document reading device 70 includes a document table 72 on which a document is placed, a pair of document feed rollers 74 for feeding a document placed upward on the document table from one end thereof, and a document moving on the document reading table 76. A document reading head 78 such as a CCD element for optically reading a colored portion of the document and generating an electric signal, and a pair of document feed rollers 82 for feeding the read document to a document receiving table 80. I have.

The original reading head 78 includes a number of point-like original reading elements provided so as to extend over the entire width of the original in a direction perpendicular to the original feeding direction by the original feed rollers 74 and 82. The coloring portion of the original passing below the original is separated into a large number of dot positions at once over the entire width of each original feeding position and read. In this case, each of the dot coordinates of the two-dimensional dot matrix, in which the coloring portion of the document has a direction orthogonal to the feeding direction of the rectangular document as the abscissa in one dimension and the feeding direction of the document as the ordinate in another dimension The information is read as ON or OFF information at the position.

A set of abscissa dot signals at each ordinate position of the original obtained by the original reading head 78 is collected by a plate making controller (C) 8 constituted by a computer.
Sent to 4. The plate making control device 84 is also supplied with a signal relating to the circumferential position of the printing drum 10 from the pitch pattern reading device 58, whereby the plate making control device 84 can color the original in accordance with the two-dimensional dot matrix. Creates pattern information for a set. The reading of the original image is completed, and the creation of the image pattern following the two-dimensional dot matrix is completed, or a series of abscissa numerical value group information at each ordinate position is obtained without waiting for the completion. Each time these signals are read, these read signals are supplied to a thermal head controller (T) 86, which controls on / off of each heating element of the thermal head 28 based on the signals. Meanwhile, the printing drum 10 is synchronously driven by a rotation driving device (D) 88 based on a command signal from the plate making control device 84.

Instead of reading the original by the original reading device 70, the plate-making control device 84 is operated by a similar two-dimensional dot matrix image signal created by a computer or word processor (not shown). It will be apparent to those skilled in the art that this may be the case.

The stencil sheet wound on the outer peripheral surface of the printing drum 10 is formed into a perceived image by decomposing the colored image portion of the document into a two-dimensional dot matrix. The stencil making operation may be performed when the stencil sheet 62 is being wound around the printing drum 10, or after the stencil sheet 62 is once wound around the printing drum 10, For one more revolution. In addition, the stencil paper 62 is wound tightly around the printing drum 10 by securely mounting the starting end of the stencil paper on the cross beam member 10c of the printing drum by the clamp 11, and then passing between the rollers by the roller pair 64. This is achieved by rotating the printing drum 10 and winding the stencil sheet around the stencil sheet 62 while applying moderate braking to the advancing stencil sheet 62.

FIGS. 4 and 5 are schematic front views showing one embodiment of a rotary stencil printing machine in which the present invention is applied to multicolor printing according to the embodiment shown in FIGS. FIG. 3 is an illustrative plan cross-sectional view (a cross-sectional view taken along a horizontal cross-section passing through the middle of the vertical thickness of the rail-matrix guide support means) showing the guide support means of the drum unit forming a part thereof. In these figures, parts corresponding to the parts shown in FIGS. 1 to 3 are denoted by the same reference numerals as those in FIGS.

In the embodiment of the rotary printing stencil printing machine for multicolor printing, the printing drum 10 and the inking roller 3
The drum unit in which the above-described ink supply means including the cartridge 4 and the doctor rod 35 and the printing drum peripheral wall support means including the roller 114 are assembled by the frame body 124 is used for individual printing of three primary colors such as cyan, magenta and yellow. Three sets are provided. These three sets of drum units are formed by three pairs of arm portions 126 extending above both ends along the printing drum of each frame body 124 and an intermediate portion.
The rotary stencil printing machine is supported by a rail matrix 128 supported by a machine frame not shown in the figure and thereby moves in a horizontal and vertical direction in a horizontal plane, as better shown in FIG. Guided as possible. In this embodiment, the rail matrix 128 is the aforementioned guide support means for the drum unit.

In FIG. 4, the leftmost drum unit is set to the operating position, and the other two drum units are set to two different storage positions.
Each of these drum units is releasably locked at each of the operating position and the two storage positions by locking means (not shown).

In the drum unit set at the operating position, the printing drum 10 is used to hold the stencil paper roll 60.
Stencil sheet supply means including a stencil feed roller 64 and a cutting device 68, and a rotatable stencil printing machine mounted on a machine frame (not shown) via a telescopic actuator 130, in proximity to the peripheral wall of the printing drum. A thermal head 28 movable between a position shown in the drawing and a position deviated leftward in the figure and further away from the peripheral wall of the printing drum;
5, a new stencil sheet is wound around the peripheral wall of the printing drum, the stencil sheet is made, and the used stencil sheet is discharged from the peripheral wall of the printing drum in cooperation with the stencil discharging means including the stencil sheet 5, the stencil discharging roller 67 and the stencil discharging box 69. (Actually, the used stencil sheet is discharged from the peripheral wall of the printing drum when the next new printing is required.) After the stencil printing, the printing paper supply tray 42 and the printing paper pull-out roller Printing with a stencil sheet made in cooperation with a printing paper supply means including a printing paper feed roller 46, a backing roller 36, and a printing paper receiving means including a peeling claw 52 and a printing paper receiving tray 54. I do. The manner of performing the stencil making and printing is the same as that of the embodiment shown in FIGS. 1 to 3 except that the relative positions of the stencil sheet supply means and the thermal head with respect to the rotational position of the printing drum are different due to their arrangement. Substantially the same.

In FIG. 4, the drum units located at the center and the rightmost are at different storage positions. The movement of the drum unit between the printing position and these two storage positions is, as understood from FIG. 5, as long as the moving destination is empty, the frame is kept at the insertion depth of the drum unit into the machine at the printing position. The suspension type sliding end provided on the upper end of the arm 126 of the body 124 is achieved by sliding along the horizontal rail groove 128s of the rail matrix 128.

In the drum unit at the printing position and the two storage positions, the suspension type sliding ends provided at the upper ends of the arms 126 of the frame body 124 are respectively inserted into the vertical rail grooves 128a of the rail matrix 128 from the respective positions. By sliding along, it can be moved out of the machine. The movement of the drum unit toward the outside of the machine is performed by a stopper (not shown) at a position before the suspension type sliding end provided at the upper end of the intermediate arm portion 126 falls off from the vertical rail groove 128a of the rail matrix. And the suspended sliding end of the middle arm 126 and the back arm 1
26 Suspended Sliding Ends Both Still in Rail Matrix 1
5 (the virtual line 1 in FIG. 5).
0 '), and the drum unit stopped at this position grasps the handle 132 shown schematically in FIG. The stopper can be completely removed from the machine while releasing the stopper intentionally.

Now, when printing of one color by the drum unit in the operating position is completed, and then printing of another color by the central drum unit is to be performed, first, the above-mentioned locking means for the central drum unit is released. Then, the drum unit is taken out of the machine along the vertical rail groove 128a of the rail matrix. Next, the locking means of the drum unit in the operating position is released, the drum unit is moved to the central storage position along the horizontal rail groove 128s of the rail matrix, and this is locked by the locking means corresponding to that position. Then, the drum unit taken out of the machine may be inserted to the operating position along the vertical rail groove 128a of the rail matrix corresponding to the operating position, and locked at the operating position by the locking means. At this time, a clutch (not shown) of the power unit for driving the printing drum is automatically engaged with the drum unit set at the operating position, and the amount of ink supplied to the printing drum is detected. An electrical connector (not shown) that automatically connects the electrical circuit for the corresponding ink sensor automatically engages. Structures relating to the insertion / removal of the drum unit with respect to such an operation position and the engagement / disengagement of the clutch and the electric connector as described above are well known in this technical field.

After the printing of one color by the drum unit in the operating position is completed, when the printing of another color by the rightmost drum unit is to be performed next, first, the rightmost drum unit is locked. Release the means and take it out of the machine, then move the central drum unit to the rightmost storage position along the horizontal rail groove 128s of the rail matrix with the same operation of the locking means, and then move to the operating position. A certain drum unit is moved to the central storage position, and the last drum unit taken out of the machine is moved to the vertical rail groove 12 of the rail matrix corresponding to the operation position.
What is necessary is just to insert along 8a to an operation position.

Thus, according to the embodiment shown in FIGS. 4 and 5, the portions which are in direct contact with the printing ink and are dyed with the printing inks of the respective colors, and are naturally used for printing of different colors. A rotary stencil stencil printing machine that can share all other parts for printing of each color except for the drum unit, which cannot assemble the printing drum, the ink supply means, and the printing drum peripheral wall support means at the time of plate making with a frame In this respect, a practical device can be obtained.

Although the present invention has been described in detail with reference to two embodiments, the present invention is not limited to these embodiments, and various other embodiments may be included within the scope of the present invention. It will be clear to those skilled in the art that is possible.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing one embodiment of a rotary stencil printing machine according to the present invention.

FIG. 2 is a schematic side view of the rotary stencil printing machine shown in FIG.

FIG. 3 is an exploded perspective view showing a more specific example of a thermal head in the rotary stencil printing machine shown in FIGS. 1 and 2;

FIG. 4 is an illustrative front view similar to FIG. 1, showing one embodiment in which the rotary stencil printing machine according to the present invention is applied to multicolor printing.

FIG. 5 is an illustrative plan view showing guide support means of the rotary stencil printing machine shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Printing drum 10a, 10b ... Annular member of printing drum 10c ... Cross beam member of printing drum 10d ... Peripheral wall of printing drum 11 ... Clamp 13 ... Shaft 15 ... Elastic thin piece 17 ... Magnet plate 28 ... Thermal head 34 ... Inking roller 35 ... Doctor rod 36 ... Back pushing roller 37 ... Ink lump 38 ... Nipping area 40 ... Depression 42 ... Printing paper supply tray 44 ... Printing paper pulling roller 46 ... Printing paper feeding roller 48 ... Clamp 50 ... Pressing roller 52 ... Peeling claw 54 ... Printing paper receiving tray 56 ... Pitch pattern 58 ... Pitch pattern reading device 60 ... Stencil sheet roll 62 ... Strip-shaped stencil sheet 64 ... Sheet paper feed roller 65 ... Sheet discharging claw 66 ... Sheet paper guiding device 67 ... Sheet discharging roller 68 ... Cutting device 69 ... Sheet discharging Box 70: Document reading device 72: Document mounting table 74: Document feeding Roller 76: Document reading table 78: Document reading head 80: Document receiving table 82: Document feeding roller 84: Plate making control device 86: Thermal head control device 88: Rotary driving device 90: Thermal head support frames 92, 94: Thermal head Arms of support frame 96, 98 Bracket 100 Shaft 102 Bracket 104 Hook 106 Tension coil spring 108 Lug 110 Step motor 112 Eccentric cam 114 Roller 116 Bracket 118 Shaft 120 Shaft 122 Eccentric cam 124 ... Frame 126 ... Arm of frame 128 ... Rail matrix 128s ... Horizontal rail groove 128a ... Vertical rail groove 130 ... Actuator 132 ... Handle

Claims (8)

[Claims] A printing drum having a porous cylindrical peripheral wall;
An ink supply unit that includes an inking roller that comes into contact with the peripheral wall of the printing drum from the inside thereof and supplies ink to the peripheral wall of the printing drum from the inside; and supplies stencil paper toward the peripheral wall of the printing drum. Stencil sheet supply means, stencil discharge means for peeling used stencil sheet from the peripheral wall of the printing drum, and backing roller disposed outside the peripheral wall of the printing drum and opposed to the inking roller Printing paper supply means for supplying printing paper toward a sandwiching area between the printing drum and the backing roller, printing paper receiving means for receiving printed printing paper through the sandwiching area, A thermal head for making a stencil sheet on the printing drum, the heating element having a heating element that comes into contact with the stencil sheet wound around the peripheral wall of the printing drum; And a rotary stencil printing machine having the following features.When the stencil sheet is stencil-made by the thermal head, the stencil sheet is inside the peripheral wall of the printing drum, is opposed to the heating element of the thermal head, and is pressed from the outside by the heating element. A rotary stencil printing machine comprising a printing drum circumferential wall supporting means for supporting the circumferential wall from inside. 2. The rotary stencil printing machine according to claim 1, wherein the printing drum peripheral wall support means at the time of plate making is a roller which rotates around a central axis. 3. The peripheral wall of the printing drum is spaced apart from the peripheral wall of the backing roller so that the peripheral wall of the printing drum does not contact the outer peripheral surface of the printing drum when it is not pressed radially outward from the inside by the inking roller. In printing, the action of sandwiching the printing paper between the peripheral wall of the printing drum and the backing roller during printing is such that a part of the peripheral wall pressed radially outward from the inside by the inking roller is formed by the gap. 3. The method according to claim 1 or 2, characterized in that it is achieved by eliminating and flexibly biasing.
A rotary stencil printing machine according to claim 1. 4. A plurality of drum units each comprising a combination of said printing drum, said ink supply means, and said printing drum peripheral wall support means at the time of plate making, wherein each one of said plurality of drum units is a common drum unit. The stencil sheet supply means, the stencil discharge means, the thermal head, the printing paper supply means, the printing paper receiving means, and the backing roller cooperate sequentially to perform multicolor printing. The rotary stencil printing machine according to any one of claims 1 to 3. 5. The plurality of drum units are each supported by guide support means provided on a frame of a rotary stencil printing machine at a frame portion thereof, and the guide support means is provided for the plurality of drum units. One is the stencil sheet supply means,
The plate discharging means, the thermal head, the printing paper supply means, the backing roller, and the printing paper receiving means are supported in an operation position where plate making and printing are performed in cooperation with each other, and the other drum units are parallel to the one drum unit. And each of the drum units is movably guided from each of the operating position and the storing position toward the outside of the machine frame in a direction along the central axis of the printing drum, and The rotary stencil printing machine according to claim 4, characterized in that the rotary stencil printing machine is configured to be movably guided between the operating position and the storage position in a direction perpendicular to the center axis of the printing drum. 6. A plurality of said storage positions are provided, and said guide support means is configured to guide each drum unit between said plurality of storage positions so as to be movable in a direction perpendicular to a central axis of said printing drum. The rotary stencil printing machine according to claim 5, characterized in that: 7. The printing apparatus according to claim 1, wherein the drum unit has a first pair of arms suspended from one end of the printing drum when viewed from outside the printing drum. A second pair of arms suspended at a position, and a third pair of arms suspended at a position intermediate the first and second pair of arms. The means has a rail groove for guiding the upper ends of the first pair of arms, the second pair of arms, and the third pair of arms of the drum unit by suspending engagement. A rail groove guides the drum unit outward from the machine in a direction along a central axis of the printing drum from each of the operation position and the storage position, and a rail groove between the operation position and the storage position. And a lateral rail groove for guiding in a direction perpendicular to the center axis of the printing drum. Rotary stencil plate printing machine according to claim 5 or 6 that. 8. The rotary press according to claim 7, wherein said third pair of arms is disposed closer to said first pair of arms than said second pair of arms. Stencil printing machine.