JPH0858217A - Screen printing machine - Google Patents

Abstract

PURPOSE: To provide a small-sized lightweight screen printing machine capable of reducing vibration or noise and capable of also corresponding to high speed rotation. CONSTITUTION: A screen printing machine is equipped with a printing drum 5, an ink supply device 200, a plate supply roll shaft support means 175, a plate supply unit 170, a thermal head 4, a plate discharge roll shaft support means 185 and a plate discharge unit 180 freely revolvable around a rotary center shaft 6 with respect to the printing drum 5 and the plate supply unit 170. Further, cams 136a, 136b having large diameter parts 136c provided to a part of the peripheral surfaces thereof at the end part of the printing drum 5, the bearings 122a, 122b provided to the shaft 11s of a pressure contact roller 11 and following the cams 136a, 136b and the springs 121a, 121b energizing the bearings 122a, 122b in the direction bringing them into contact with the cams 136a, 136b under pressure are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a scanner, a personal computer,
The present invention relates to a stencil-type plate making / printing apparatus of a plate making / printing integrated type which prints image information by a facsimile or the like on a recording medium such as printing paper.

[0002]

2. Description of the Related Art In a plate making section and a plate making section of a conventional stencil printing machine, a stencil master in which a porous support such as Japanese paper is attached to a thermoplastic resin film is wound in a roll form. The heat-sensitive perforation of the stencil master is performed by a plate-making means such as a thermal head, and the trailing end of the plate-prepared master is cut by cutting means such as a cutter unit after the completion of the plate-making. Was held by the clamper of the printing drum and wound around the outer circumference of the printing drum.

In contrast to such a stencil master plate feeding / conveying system, there is also a purpose of winding the stencil master (stencil sheet) around the outer periphery of a printing drum (plate cylinder) without cutting it to eliminate conveyance troubles. In addition, the stencil master is supplied from the master supply unit arranged in the vicinity of the outer peripheral surface of the printing drum, and the thermal head is used to perforate the plate and wind it around the outer circumference of the printing drum. Japanese Patent Publication No. 5-70595 discloses a technique for winding and accommodating on a winding shaft of a plate discharging means (a plate discharging winding section) arranged as described above.

The printing apparatus to which the above technique is applied is provided with a plate feed roll shaft support means (feed shaft) provided near the outer periphery of the printing drum, and a plate feed roll supported by the plate feed roll shaft support means.
A platen roller for plate making / conveying, a winding shaft supporting means (winding shaft), and a plate discharging roll supported by the platen roller (hereinafter collectively referred to as "plate feeding / discharging part") rotate integrally with a printing drum. To do. Therefore, the use of the pressure contact roller as the printing pressing means in the above-mentioned printing apparatus or the like requires that the pressure contact roller that presses the printing paper against the printing drum be largely retracted each time the plate feeding / discharging section rotates, and It is not suitable for high-speed printing, because vibration and noise are generated when pressing and releasing the pressure. Therefore, as shown in FIG. 3 of the publication, the diameter of the printing drum is the same as that of the printing drum, and the printing drum is pressed against the printing drum to rotate at the same peripheral speed as the printing drum. A pressure contact drum (press roller) having a notched outer circumference so as not to come into contact with each other is used so that it is not necessary to retreat significantly during printing. By using such a pressure contact drum, it is not necessary to significantly displace the pressure contact drum during printing, and it is possible to support high speed rotation of the print drum.

[0005]

However, for example, in order to print on A3 paper, the diameter of the printing drum must be at least the vertical length of A3 paper plus the outer peripheral length of the plate feeding / discharging section. Therefore, the pressure contact drum also has the same diameter as the print drum, that is, the diameter of the pressure contact drum and the print drum is about 190 mm. Therefore, since two press contact drums having the same diameter as the print drum are arranged in the printing apparatus, the apparatus becomes large in size, and the weight also increases, and the time until the constant speed rotation of the print drum and the time until the stop become long. There is.

Therefore, in order to solve such a problem, it is an object of the present invention to provide a stencil-type plate-making and printing apparatus which is small and lightweight, which can reduce vibrations and noises, and which can further support high-speed rotation. And

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 is a printing drum, in which a master for stencil is wound around an outer peripheral surface and rotates around a rotation center axis, and the above printing. Ink supply means for supplying ink to the inner peripheral surface of the drum, a master supply section for storing one end of the master in a roll shape, a plate making means for making the master, and a used master from the outer peripheral surface. A plate discharging unit for peeling and storing and discarding, a plate supplying / discharging unit that is rotatable around the rotation center axis with respect to the printing drum, and has at least the master supply unit, and the printing drum via a printing sheet. In a stencil plate making and printing apparatus comprising a press roller that selectively occupies a printing position in pressure contact with a non-printing position separated from the printing drum, and A cam substantially coaxial with the printing drum, which is provided coaxially with the rolling center axis and has a large diameter portion on a part of its peripheral surface, and wherein the pressing roller is provided at the printing position and the non-printing position, respectively. A cam for selectively displacing, a cam follower for a pressure contact roller which is provided on the shaft of the pressure contact roller and is driven by the cam, and a pressure contact roller for urging the cam follower for the pressure contact roller in a direction in which the cam follower is pressed against the cam. And a biasing means.

According to a second aspect of the present invention, in the stencil printing machine according to the first aspect, the pressure contact release start position and / or the pressure contact release end position of the pressure contact roller at the non-printing position is outside the cam. A guide means for guiding the pressure follower cam follower is arranged.

According to a third aspect of the present invention, in the stencil printing machine according to the first or second aspect, both ends of the pressure contact roller are rotatably supported by pressure contact roller arms which are swingable about a support shaft. When the pressure contact roller occupies the non-printing position, the pressure contact roller retaining means for retaining the pressure contact roller at that position, and the pressure contact roller retaining means for retaining the pressure contact roller at the printing position during printing. The pressure contact roller holding release means for releasing the hold of the pressure contact roller.

According to a fourth aspect of the present invention, in the stencil type plate making printing apparatus according to the first, second or third aspect, the printing drum and the pressure contact roller are provided on the upstream side of the sheet conveying path near the pressure contact roller. A paper feed side guide member which is displaceable between a guide position for guiding the printing paper and a non-guide position apart from the guide position; and the paper feed side guide member, It is characterized in that it has a sheet feeding side guide member displacing means for selectively displacing the guide position and the non-guide position in conjunction with press contact and separation.

The invention according to claim 5 is the invention as defined in claims 1, 2, and 3.
Alternatively, in the stencil-type plate making printing apparatus according to 4, the printed printing paper discharged from between the printing drum and the pressure contact roller, which is provided on the downstream side of the paper conveyance path near the pressure contact roller, is discharged to the downstream side. A discharge-side guide member that is displaceable between a discharge guide position for guiding and a non-discharge guide position that is separated from the discharge guide position, and the discharge-side guide member are pressed against the printing drum by the pressure contact roller. And a discharge-side guide member displacing means for selectively displacing the discharge guide position and the non-discharge guide position in association with the separation.

[0012]

According to the invention described in claim 1, the cam follower for the pressure contact roller is biased in the direction in which the cam and the cam follower for the pressure contact roller are in pressure contact with each other by the biasing means for the pressure contact roller to rotate the plate cylinder. By synchronously engaging the cam and the cam follower for the pressure contact roller, the pressure contact roller is selectively displaced between the printing position and the non-printing position, and evenly pressed against the plate cylinder at the printing position, thereby non-printing. At the position, it does not interfere with the master supply unit or the like arranged in the plate supply / discharge unit. Further, since the print drum and the cam rotate integrally, the press contact and the press release of the print drum and the press roller via the cam follower for the press roller can be performed reliably and gently.

According to the second aspect of the present invention, guide means for guiding the cam follower for the pressure contact roller is provided outside the cam at the pressure contact release start position and / or the pressure contact release end position of the pressure contact roller in the non-printing position. Since the pressure contact roller cam follower is disposed, the pressure contact and the pressure contact release between the print drum and the pressure contact roller can be performed more reliably and smoothly.

According to the third aspect of the present invention, the pressure contact roller holding means holds the pressure contact roller at the non-printing position at the non-printing position during non-printing. On the other hand, during printing, the holding of the pressure contact roller by the pressure contact roller holding means is released by the pressure contact roller holding release means.

According to the fourth aspect of the invention, the paper feed side guide member displacing means causes the paper feed side guide member to move between the guide position and the non-guide position in association with the press contact and separation of the press contact roller to the print drum. Since it is selectively displaced, the paper feed side guide member can be installed near the pressure contact roller.

According to the fifth aspect of the present invention, the paper discharge side guide member displacing means causes the paper discharge side guide member to interlock with the press contact and separation of the press contact roller to the print drum and the non-discharge guide position. Since it is selectively displaced to the paper guide position, the paper discharge side guide member can be installed near the pressure contact roller.

[0017]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a configuration diagram of a main part of a stencil printing plate making and printing apparatus according to an embodiment of the present invention. First, the structure of the main part will be described. In FIG. 1, reference numeral 700 indicates a stencil-type plate-making printing apparatus. Reference numeral 701 indicates a frame arranged at a predetermined position of the stencil plate making and printing apparatus 700. This stencil-type plate-making / printing apparatus 700 is supported by a frame 701 and has a master 1 for stencil wound around its outer peripheral surface and rotates around a rotation center axis 6, and an ink on the inner peripheral surface of the print drum 5. Ink supply means 200 for supplying ink
And one end of the master 1 is wrapped around the core tube 2s and supplies the master 1 to the printing drum 5.
s plate supporting roll shaft supporting means 175, and a plate supplying unit 170 rotatable about the rotation center axis 6 with respect to the printing drum 5 and having the plate supplying roll shaft supporting means 175.
Of the thermal head 4, which is supported by the main body side of the stencil-type plate making printing apparatus 700 (hereinafter, simply referred to as “printing apparatus main body side”) as a plate making means for making the master 1, and the plate feed roll shaft supporting means 175. A platen roller 3 which is disposed in the vicinity and conveys the master 1 in the master conveying direction while pressing the master 1 against the thermal head 4 at the time of plate making, and the other end of the master 1 is wound around the winding shaft 9 to dispose the used master 1b on the printing drum 5. A plate discharge roll shaft supporting means 185 that supports the winding shaft 9 of the plate discharge roll 10 that is wound up from the plate, and is rotatable around the rotation center shaft 6 with respect to the printing drum 5 and the plate supply unit 170 and supports the plate discharge roll shaft. The plate discharge unit 180 having the means 185, the pressure for selectively occupying the printing position in pressure contact with the printing drum 5 via the printing paper P and the non-printing position separated from the printing drum 5. The pressure roller 11 is a cam that is substantially integrated with the roller 11 and the print drum 5 that is provided coaxially with the rotation center shaft 6 at both ends of the print drum 5 and that has a large diameter portion 136c on a part of its peripheral surface. Is a pair of pressure contact roller feeding / discharging portion avoiding cams 136a and 136b (hereinafter, simply referred to as "cams 136a and 136b", or "cam pair 136a,") for selectively displacing between the printing position and the non-printing position. 136b ”), and each cam 136 provided at each shaft 11s end of the pressure roller 11
a, 136b, a pair of bearings 122a, 122b as cam followers for pressure contact rollers, and each bearing 122
It is mainly composed of a pair of tension coil springs 121a and 121b as biasing means for a pressure contact roller that biases a and 122b in a direction in which they are pressed against the cams 136a and 136b.

The plate supply unit 170 includes a plate supply arm pair 7a and 7b, a plate supply roll shaft supporting means 175, a plate supply roll 2, a platen roller 3, and a balancer weight 51A, which will be described later.
And a friction clutch 15 for plate feeding.

The plate discharging unit 180 is mainly composed of a plate discharging arm pair 8a, 8b, a plate discharging roll shaft supporting means 185, a plate discharging roll 10, a plate discharging roll gear 55, a balancer weight 51B and a plate discharging friction clutch 16 which will be described later. .

The winding shaft 9 of the plate discharge roll 10 constitutes plate discharge means. Further, the plate feed roll shaft support means 175 that supports the core tube 2s of the plate feed roll 2 constitutes a master supply unit that stores one end of the master 1 in a roll shape.

The core tube 2s is also called a plate feed roll shaft and the take-up shaft 9 is also called a plate discharge roll shaft. In the present embodiment and the like, the terms core pipe and take-up shaft are used in unification.

The following describes the structure around the printing drum 5, the ink supply means 200, each component of the plate supply unit 170, each component of the plate discharge unit 180, the structure around the thermal head 4 and the structure around the pressure contact roller 11. Description will be made with reference to FIGS.

1 to 18, the ink supply means 200, each component of the plate supply unit 170, each component of the plate discharge unit 180, and a positive cam pair 1 to be described later.
35a, 135b, paper feed side guide plate pair 10
6a, 106b, each component of the paper feed side guide member displacing means, the paper discharge side guide plate 111, each component of the paper discharge side guide member displacing means, the drive gear 125, the idler gear 126,
Each component of the roller gear 127, the pressure contact roller holding means 130 also serving as the pressure contact roller holding release means, the plate discharge arm stopping means 35, the brake unit 26, the plate supply / discharge plate joining means 40, the thermal head contact / separation device 50 and the plate discharge roll driving means 54. Details of each component and the like are omitted as occasion demands in order to simplify each drawing.

In FIGS. 2 and 3, a large number of minute holes (not shown) having ink permeability are formed on the outer periphery of the printing drum 5 over substantially the entire periphery except both side edges and joints. The supporting cylindrical body 5a is provided, and an ink-permeable mesh screen 5b having a thickness of 0.1 mm is wound on the outer peripheral surface of the supporting cylindrical body 5a. Therefore, the ink supplied to the inner peripheral surface from the ink supply means 200 arranged inside the printing drum 5 can pass through substantially the entire circumference of the support cylinder 5a.

Support cylinder 5a and mesh screen 5
At both end portions of b, a disc-shaped drum flange portion 12a,
12b is provided. Both end portions of the supporting cylindrical body 5a and the mesh screen 5b are attached to the drum flange portions 12 respectively.
It is attached to the outer peripheral portions of a and 12b. The drum shaft 13 is provided at the central base of each drum flange 12a, 12b.
The print drum 5 is integrally formed with a and 13b, and is rotatably supported by the rotation center shaft 6 via a bearing 14. The print drum 5 is rotationally driven in the arrow A direction and the arrow B direction shown in FIG.

On the drum shafts 13a and 13b, a pair of plate feeding arms 7a and 7b are provided inside the printing drum 5 with the printing drum 5 interposed therebetween.
(Hereinafter, sometimes referred to as "plate feeding arm pair 7a, 7b"), but a pair of plate ejection arms 8a, 8b (hereinafter sometimes referred to as "plate ejection arm pair 8a, 8b") on the outside thereof are not shown. It is rotatably supported with respect to the rotation center shaft 6 via. The bases of the plate feeding arms 7a and 7b are connected to the drum shaft 13 via a plate feeding friction clutch 15.
The bases of the plate discharging arms 8a and 8b are connected to the drum shafts 13a and 13b via the plate discharging friction clutch 16, respectively.

As will be described later, the plate feeding friction clutch 15 has plate feeding arms 7a and 7b in the direction in which the rotational driving force of the drum driving means 230 is transmitted to the printing drum 5 at the time of initial master setting and printing. Drum shafts 13a, 13b
Are connected and rotated integrally, while the platen roller 3 and the plate discharge roller 10 are rotationally driven during plate making and plate discharge, so that the plate feeding arms 7a and 7b and the drum are moved in the direction in which the printing drum 5 rotates. It is set so as to cut off the connection with the shafts 13a and 13b. As will be described later, the plate discharge friction clutch 16 is configured to allow the plate discharge arm 8a,
8b and the drum shafts 13a, 13b are connected and rotated integrally, and on the other hand, at the time of initial master setting and during plate making and plate ejection, the plate ejection arms 8a, 8b are disconnected from the drum shafts 13a, 13b, respectively. Has been done. The plate supply friction clutch 15 and the plate discharge friction clutch 16 are manually disengaged for manual operation at the time of jam.

As shown in FIG. 2, a drum gear 17 is integrally formed on one end side of the drum shaft 13a. A drive motor M fixed to a side plate (not shown) on the printer body side and connected to one end of a drum drive shaft 18 is disposed outside the drum gear 17. At the other end of the drum drive shaft 18,
Drive gear 1 having teeth formed to mesh with the drum gear 17
9 is fixed. As described above, the drum driving means 2
30 is composed of a drive motor M, a drum drive shaft 18, and a drive gear 19. The drum driving means 230 is shown only in FIG.

As shown in FIGS. 1 to 3, each cam 136 is
The a and 136b form so-called substantially arcuate cams, and the base ends of the a and 136b are located outside the respective plate discharge arms 8a and 8b so that the drum shafts 13a and 13b have their base ends.
They are integrally formed on each. Each cam 136a, 1
The large-diameter portion 136c of 36b is provided in a state where the plate feeding unit 170, the plate discharging unit 180, and the printing drum 5 are located at the fixed positions (also referred to as plate feeding positions) shown in FIGS. 1 and 4.
The unused plate feeding roll 2U of the plate feeding unit 170 in a side view,
The platen roller 3 and the used master 1b of the plate discharge unit 180 are formed in a fan shape having the same contour as each other so as to cover the outermost protruding portions such as the plate discharge roll 10 (shown by phantom lines in FIG. 1) that is full. ing.

The free ends of the cams 136a and 136b are
Guide grooves 137m and 137n that are bent at a right angle outward from the portion of the large diameter portion 136c and are recessed in a U-shaped cross section are formed, and further extend in the centrifugal direction and extend toward the guide portions 138a and 138.
b is formed. Each guide portion 138a, 138b
1, as shown in FIG. 1, each of the cams 136a, 13a in side view.
It is formed so as to cover the contour surface of 6b and has a substantially fan shape with the same contour, and is formed so as to have the same phase position on the left and right. That is, each of the guide portions 138a and 138b is
Each cam 136a, 1 at the pressure contact release start position and / or the pressure contact release end position of the pressure contact roller 11 at the non-printing position
It is formed on the outer side in the centrifugal direction of 36b. Each cam 136
The contour peripheral surface of the large diameter portion 136c of a and 136b is set to correspond to the non-image printing range a, and the outer periphery of the printing drum 5 excluding the non-image printing range a is set to correspond to the image printing range b.

The guide grooves 137m and 137n and the guide portions 138a and 138b constitute guide means for guiding the bearings 122a and 122b. Thus, cam 1
36a and 136b, guide grooves 137m and 137n, and guide portions 138a and 138b are so-called positive cams 135.
a, 135b (hereinafter, referred to as “probability cam pair 135a, 135
b)). The guide grooves 137m in the positive cams 135a and 135b,
The groove width in the centrifugal direction that engages with the bearings 122a and 122b of the 137n is determined by the bearings 122a and 122b for the reason described below.
An expansion margin is formed at least about 2 mm larger than the outer diameter of b. Furthermore, each guide groove 137m, 137
The pressure contact release starting portion 1 corresponding to the above-mentioned pressure contact release start position n.
The groove width of 37f and the pressure contact release end portion 137e corresponding to the pressure contact release end positions of the guide grooves 137m and 137n.
The groove width is set to be larger than the expansion allowance of 2 mm so that the engagement with the bearings 122a and 122b can be started or disengaged gently and smoothly during printing.

The positive cam pairs 135a and 135b are made of a metal such as an aluminum alloy, and are formed with a large number of lightenings (not shown) for the purpose of weight reduction. It contributes to the reduction of inertia when rotating. The material of the positive cam pair 135a, 135b is
The material is not limited to the above metals and the like, and may be resin or the like for weight reduction, which is advantageous in cost.

2 and 3, each plate feeding arm 7
a, 7b, each plate discharge arm 8a, 8b and each positive movement cam 13
At the base side of 5a and 135b, the rotation center shaft 6 is provided with respect to the plate feeding arms 7a and 7b, the plate discharging arms 8a and 8b, and the positive cams 135a and 135b in the fixed position state of FIG.
In order to maintain the rotational balance in a symmetrical position via
Balancer weights 51A, 51B made of materials of relative importance
Also, a balancer weight 139 for cam is fixed.
The balancer weights 51A and 51B and the cam balancer weight 139 are arranged so as not to interfere with other parts when the plate feeding arm pair 7a and 7b, the plate discharging arm pair 8a and 8b, and the printing drum 5 rotate. The balancer weights 51A and 51B and the cam balancer weight 139 are substantially fan-shaped in a side view, and the rotation center shaft 6
The size and weight are set so as to be balanced with the rotational moment components of the plate feeding unit 170, the plate discharging unit 180, and the positive movement cams 135a and 135b.
As will be described later, especially in the printing process, the printing drum 5
And a pair of positive movement cams 135a, 136 integrally formed with the
b, the plate supply unit 170 and the plate discharge unit 180 integrally rotate at high speed. At this time, as described above,
Since the balancer weights 51A and 51B and the balancer weight 139 for the cam are provided, the integrated object as a whole has a good rotation balance and a small load fluctuation during rotation, and thus more stable high-speed printing. Can be done. The balancer weights 51A, 51B and the cam balancer weight 139 are shown only in FIGS. 2 and 3, and are omitted in other drawings for the sake of simplicity.

Between the free ends of the plate feeding arms 7a and 7b and between the free ends of the plate discharging arms 8a and 8b, there are connecting members (not shown) for connecting both arms to maintain rigidity. They are bridged so as not to interfere with other parts.

In FIG. 1, the ink supply means 200 is
The inner peripheral surface of the print drum 5 which is disposed inside the print drum 5,
That is, the ink roller 20 that supplies ink to the inner peripheral surface of the support cylinder 5a, and the doctor roller 22 that is arranged in parallel with the ink roller 20 with a minute gap and forms an ink reservoir 21 between the ink roller 20 and the doctor roller 22. And an ink supply pipe 6 that also serves as the rotation center shaft 6 of the printing drum 5 and supplies ink to the ink reservoir 21.

As shown in FIGS. 1 to 3, the pressure contact roller 1
1 is rotatably disposed near the lower side of the outer peripheral surface of the printing drum 5 facing the ink roller 20, and has a well-known configuration extending in a direction parallel to the rotation center axis 6. The pressing roller 11 has a pressing member made of synthetic rubber substantially integrally attached to a shaft 11s formed in a stepped shape whose diameter gradually decreases toward both ends. This axis 11
At both ends of s, the large diameter portion 13 of each cam 136a, 136b is provided.
6c and a pair of bearings 122a, 122b that selectively follow
Is installed. The bearings 122a and 122b are rolling bearings such as cylindrical roller bearings. Bearing 122
The bearings 122a, 122b are securely held at one end of the a, 122b when the bearings 122a, 122b are guided by the respective guide grooves 137m, 137n while being driven by the large diameter portions 136c of the cams 136a, 136b. A tsuba is provided to do this. The outer diameters of the bearings 122a and 122b are the same as the pressure roller 11
Is formed to have a smaller outer diameter than the outer diameter of the print drum 5 and a gap in which the print image can be reliably transferred when the print paper P is pressed between the outer peripheral surface of the print drum 5 and the pressure roller 11 in the image print range b. It is given (see FIGS. 1 and 2).

The outer diameter of the pressure roller 11 is equal to that of the bearing 12.
2a and 122b are exaggerated in order to clarify the difference between the outer diameters of 2a and 122b.
When the bearings 122a and 122b are driven by the rollers 36a and 136b, the unused plate feeding roll 2U of the plate feeding unit, the platen roller 3 and the used master 1 of the plate discharging unit 180 are used.
The pressure contact roller 11 and the bearings 122a, 122a, so as not to interfere with the outermost protruding portion of the plate discharge roll 10 etc.
It goes without saying that the outer diameter of 122b and the size of the outer peripheral contour of the cam pairs 136a and 136b are designed.

A pair of pressure contact roller arms 120 are provided at the ends of the shafts 11s inside the bearings 122a and 122b.
a, 120b (hereinafter, “pressing roller arm pair 120a,
120b "). These pressure contact roller arms 120a and 120b are rotatably supported at their base ends by a pair of side plates (not shown) arranged across the paper transport path Po on the paper discharge side of the printer body. It is rotatably attached to 120s, and its free ends are the pressure contact roller arm 120a and the pressure contact roller arm 1.
It is rotatably attached to the rocking shaft 110 disposed between the rocking shaft 110 and 20b. Therefore, each arm 120
The free ends of a and 120b are swingably supported in the vertical direction with respect to the support shaft 120s. Both ends of the shaft 11s are rotatably attached to portions of the pressure contact roller arms 120a and 120b near the free ends thereof, and a roller gear 127 is fixedly attached to the shaft 11s near the inside of the pressure contact roller arm 120a. There is. A drive gear 125 is fixed to the support shaft 120s near the inner side of the pressure contact roller arm 120a. On the other hand, a shaft 126 is provided near the inner side of the pressure contact roller arm 120a between the shaft 11s and the support shaft 120s.
s is rotatably attached. An idler gear 126 that is constantly meshed with the drive gear 125 and the roller gear 127 is fixed to the shaft 126s. The pressure contact roller arms 120a and 120b are formed in the same shape on the left and right. A motor (not shown) having a gear (not shown) meshing with the drive gear 125 on its output shaft is fixedly mounted on the pair of side plates near the drive gear 125. A one-way clutch (not shown) that transmits the driving force of the motor to the output shaft only when it rotates clockwise in printing or the like and does not transmit the driving force of the motor counterclockwise that rotates following plate making and plate ejection. Is installed. The pressure contact roller 11 is driven to rotate in the direction A (clockwise direction) in the drawing at the same peripheral speed as the peripheral speed of the printing drum 5 via the drive gear 125, the idler gear 126, and the roller gear 127 during printing by driving the motor. To be done.

A pair of left and right tension coil springs 121a and 121b are provided between the pressure contact roller arms 120a and 120b between the support shaft 120s and the shaft 126s and between the side plate pairs above them. . Therefore, the bearings 122a, 122 are rotated about the support shaft 120s by the tension coil springs 121a, 121b.
B is urged in the direction in which it is pressed against the cams 136a, 136b, and the pressing roller 11 is swung in the direction in which it is pressed against the outer peripheral surface of the printing drum 5. Regarding the spring characteristics of the tension coil springs 121a and 121b, their loads, heights, spring constants, etc. are set to be stricter than usual quality standards.

As described above, the pressure contact roller 11
At each of the left and right ends of the pressure contact roller arm 12
0a, 120b rotatably supported in the same phase,
Also, a pair of left and right tension coil springs 121a and 121b
Thus, the habit of swinging in the direction of being pressed against the outer peripheral surface of the printing drum 5 is given. Therefore, the pressure contact roller 11 is uniformly pressed against the outer peripheral surface of the printing drum 5 with a uniform distribution load over the entire area in the direction of the axis 11s.

When the pressure roller 11 occupies the non-printing position near the pressure roller arms 120a and 120b,
The pressure contact roller holding means 130 for holding the pressure contact roller 11 at that position, and the pressure contact roller holding means 130 so that the pressure contact roller 11 occupies the printing position during printing.
A pressure contact roller holding release means 130 for releasing the holding of No. 1 is provided.

The pressure contact roller holding means 130 includes a pair of left and right holding release cams 131a and 131b fixed to a cam shaft 131s rotatably supported by the pair of side plates above the pressure contact roller arms 120a and 120b. A cam motor (not shown) fixed to one of the side plates and connected to one end of the cam shaft 131s via a rotation transmission member such as a gear. The cam shaft 131s is bent and supported in a crank shape between the pair of side plates in order to avoid interference with a discharge side guide plate 111 described later.

The holding release cams 131a and 131b are so-called disc cams, and their shapes and positions are set so as to satisfy the following conditions. That is,
The holding release cams 131a and 131b are in a non-printing state in which the pressure contact roller 11 is separated from the outer peripheral surface of the printing drum 5 by about 2 mm during non-printing (plate making / plate feeding other than printing or when the apparatus is stopped). When occupying a position, the cam motor causes the large diameter portion and each pressure contact roller arm 1 to move.
The large-diameter portion is rotationally driven so that the upper ends of 20a and 120b are engaged (see FIGS. 10 and 18). Therefore, it is possible to prevent the ink oozing from the outer peripheral surface of the printing drum 5 via the plate-making master 1a and the like from accidentally adhering to the pressure contact roller 11 by the operation of the pressure contact roller holding means 130. Holding release cams 131a, 131b
Is rotated by the cam motor against the biasing force of the pair of springs 121a and 121b only at the time of printing, and the engagement between the large diameter portion and the upper end portions of the pressure contact roller arms 120a and 120b is released. Small diameter part and each pressure contact roller arm 1
It is driven so as to face each other with a gap between the upper ends of 20a and 120b (see FIGS. 1 and 16).

A sheet feeding device 100 is arranged near the left side of the printing drum 5 and the pressure contact roller 11 in the figure.

The paper feeding device 100 is provided with the stacked printing paper P.
A paper feed table 102 for stacking sheets, a paper feed roller 103 for separating the print papers P one by one and sending them to the paper transport path Po, and a print paper P for sending out at a predetermined timing between the print drum 5 and the pressure roller 11. A pair of upper and lower feed rollers 104
a, 104b, paper feed roller 103, and feed roller pair 1
The print paper P is provided on a paper transport path Po between the print paper P and the vicinity of the feed rollers 104a and 104b.
Pair of paper guide plates 105a, 10 for guiding to
5b, a guide position which is provided on the upstream side of the paper conveyance path Po near the pressure contact roller 11 and which guides the print paper P between the printing drum 5 and the pressure contact roller 11 and a non-guide position which is separated from this guide position. It is mainly composed of a pair of upper and lower sheet feeding side guide plates 106a and 106b as movable sheet feeding side guide members. Paper feed tray 102 on the side of the paper feed roller 103
A compression coil spring 101 that presses the leading end of the uppermost surface of the printing paper P stacked on the paper feed tray 102 against the paper feed roller 103 is provided in the lower portion.

As shown in FIG. 1, FIG. 11, FIG. 17 and FIG. 18, a pair of left and right swing links front 107a, 107b are provided at the central portions of both side ends of the pair of paper feed side guide plates 106a, 106b.
The base end of is fixed. Paper transport path P on the paper feed side
A pair of fixing pin fronts 108 are planted in a pair of sheet feeding side plates (not shown) on the main body side of the printing apparatus, which are arranged with both ends of o sandwiched. The free ends of the rocking link fronts 107a and 107b are slidably fitted into the fixed pin front 108 with a slide claw 107c. Paper feed side guide plate pair 106
The paper guide plate pair 10 is provided at one end on the upstream side of a, 106b.
10a in front of the opening that overlaps with the downstream opening of 5a, 105b
6f has an opening rear portion 106r formed at the other end portion on the downstream side. On the other hand, the base ends of a pair of left and right swing links 109a, 109b formed in a substantially L shape are fixed to both side ends of the pair of paper feed side guide plates 106a, 106b near the opening rear 106r. . After swing link 109a, 109b
The free end of is rotatably supported by a swing shaft 110 fixed to the ends of the pair of pressure contact roller arms 120a and 120b.

As described above, the paper feed side guide plate pair 106
The feed side guide member displacing means for selectively displacing a and 106b in the guide position and the non-guide position in conjunction with the press contact and separation of the press contact roller 11 to the print drum 5 is a cam pair 13.
6a, 136b, pressure contact roller 11, bearings 122a, 12
2b, shaft 11s, support shaft 120s, pressure contact roller arm pair 1
20a, 120b, front swing links 107a, 107b,
It is mainly composed of a front fixing pin 108, rear swing links 109a and 109b, and a swing shaft 110.

In the vicinity of the right side of the printing drum 5 and the pressure contact roller 11 in the figure, a paper discharge device, a part of which is not shown, is arranged. The paper discharge device is arranged near the lower right of the printing drum 5 and is used for peeling the printed printing paper from the printing drum 5, and a paper conveyance path Po near the pressure roller 11.
And a discharge guide position for guiding the printed printing paper discharged from between the printing drum 5 and the pressure contact roller 11 to the downstream side of the paper transport path Po, which is provided on the downstream side of the discharging direction. A discharge-side guide plate 111 as a discharge-side guide member that is displaceable to a non-discharge guide position separated from the paper guide position, and the above-mentioned printed printing paper guided by the discharge-side guide plate 111 is discharged. 2 for transporting to the table
An endless conveyor belt hung between two suction rollers
And a paper discharge conveying means arranged below the conveying belt and having a suction fan for sucking the printed printing paper onto the conveying belt, and the printed printing paper conveyed by the paper discharging conveying means are sequentially stacked. It is mainly composed of a paper ejection table and a paper ejection table.

As shown in FIG. 1, FIG. 11 and FIG. 17, the U-shaped opening having an upward opening is formed at both ends of the upstream side one end portion of the sheet discharge side guide plate 111 so as to allow the pressure contact roller 11 to escape. Right and left of the pair of left and right paper discharge swing links 112a, 11
The base end of 2b is fixed. Before paper ejection swing link 11
Free ends of 2a and 112b are rotatably supported by the swing shaft 110. On the other hand, the discharge side guide plate 111
The base ends of the pair of left and right paper discharge rocking links 113a and 113b are fixed to both ends of the other downstream end of the. A pair of fixing pin rears 114 are planted on a pair of ejecting side plates (not shown) on the main body side of the printing apparatus, which are arranged on both sides of the sheet conveying path Po on the ejecting side. The free ends of the respective paper ejection swing links 113a and 113b are slidably fitted into the fixed pin rear 114 with a slide claw 113c.

As described above, the paper discharge side guide plate 111 is
The discharge side guide member displacing means for selectively displacing between the guide position and the non-guide position in conjunction with the pressure contact and separation of the pressure contact roller 11 to the print drum 5 is a cam pair 136a, 1a.
36b, pressure contact roller 11, bearings 122a and 122b, shaft 11s, support shaft 120s, pressure contact roller arm pair 120a,
120b, front of the paper ejection rocking links 112a and 112b, rear of the paper ejection rocking links 113a and 113b, rear of the fixing pin 114, and the rocking shaft 110.

As described above, the paper feed side guide plate pair 106
a, 106b, the paper feed side guide member displacing means, the paper ejection side guide plate 111, and the paper ejection side guide member displacing means are rotatably supported by the swing shaft 110, and are pressed against the printing drum 5. A link device is configured to move in the same direction as the displacement direction of the pressure contact roller 11 in conjunction with the pressure contact and separation of the roller 11 at the same time.

The base of the peeling pawl is fixed to a peeling pawl shaft, both ends of which are rotatably supported, one end of which is not shown, and the other end of which is supported by the other of the pair of paper ejection side plates. It is set up. The tip of the peeling claw is the printing drum 5
Is arranged so as to be selectively displaced between a peeling position near the outer peripheral surface of the printing drum 5 for peeling the printed printing paper from the printing drum 5 and a non-peeling position separated from the outer peripheral surface of the printing drum 5. The peeling pawl shaft has a cam 13 at its free end.
A peeling pawl drive arm provided with a peeling pawl cam follower roller that is driven by 6b is fixed. A cam 1 is provided between the base end of the peeling pawl drive arm and the paper discharge side plate.
There is provided a tension coil spring (not shown) that gives a turning tendency in a direction in which 36b and the peeling pawl cam follower roller are constantly in pressure contact with each other.

In FIGS. 1 and 4, the master 1 is made of a very thin 3 .mu.m thick substantially thermoplastic resin film, is a continuous sheet, and has a small diameter core tube 2s of the plate feed roll 2. Is wrapped around. An antistatic agent is applied to the contact surface of the master 1 with the thermal head 4. Here, the master consisting essentially of a thermoplastic resin film, in addition to those in which the master consists of only a thermoplastic resin film, those containing a trace amount of components such as an antistatic agent in the thermoplastic resin film, further, The thermoplastic resin film includes one or more thin film layers such as an overcoat layer formed on both main surfaces, that is, at least one of the front surface and the back surface.

The plate supply roll shaft support means 175 is composed of an attaching / detaching groove 7h and a brake unit 26, which will be described later.

1 and 4, the plate feeding arm pair 7
U-shaped attachment / detachment grooves 7h for attaching / detaching the plate feed roll 2 or the unused plate feed roll 2U are respectively formed at the free ends of a and 7b. The pair of plate feeding arms 7a and 7b near the attaching / detaching grooves 7h includes a core tube 2s at each end of the plate feeding roll 2.
A brake unit 26 for applying a predetermined braking force is provided in each. The plate feed roll 2 has core tubes 2 at both ends.
It is rotatably and detachably supported by both brake units 26 via s, and the plate feeding arm pair 7
It is supported so as not to come off from the brake unit 26 due to its inertia when the a and 7b rotate. Therefore, a predetermined braking force is constantly applied to the core tubes 2s at both ends of the plate feed roll 2 supported by the plate feed roll shaft support means 175, and the master 1 pulled out from the plate feed roll 2 is always constant. Is applied. The outer diameter of the plate feed roll 2 is significantly smaller than that of the conventional one.

As shown in FIGS. 1, 2, 4 and 8.
A platen roller 3 for winding and transporting the master 1 supplied from the plate feeding roll 2 around a part of the peripheral surface of the plate feeding roller 2 is provided on the plate feeding arm pair 7a, 7b near the plate feeding roll 2 supporting portion. It is attached to a shaft 3s which is rotatably supported by bearings 3j on 7a and 7b. Platen roller 3
Is made of an antistatic material made of synthetic rubber having JIS hardness A of 40 °, and is provided parallel to the rotation center axis 6 and extending in the axial direction thereof.

In FIG. 8, reference numeral 210 indicates a platen roller driving means. The platen roller driving means 210 is
It is mainly composed of a DC motor (not shown), a plate cam 32, a cam follower bracket 33, a tension coil spring 34, a pulse motor 28, and a gear 31, which will be described later.

A gear 30 is fixed to one end of the shaft 3s of the platen roller 3. A DC plate (not shown) connected to the rotary drive shaft 32s is provided on a side plate (not shown) on the printer body side.
A plate cam 32 is attached to the. In the vicinity of the cam 32 on the printer body side, a cam follower bracket 33 with a roller 33a that comes into contact with the contour peripheral surface of the cam 32 and rolls is disposed.

The cam follower bracket 33 has a shape in which arms are projected on a triangular plate, one end of the triangular portion forms a mounting portion of the roller 33a, and the base end thereof is the shaft 3.
It is pivotally attached to the side plate in 3s. The protruding arm-like free end of the cam follower bracket 33 is given a turning tendency in the counterclockwise direction in the drawing by the tension coil spring 34 locked to the side plate. Further, a pulse motor 28 having a gear 31 fixed to the rotary drive shaft 31s and a gear 31 meshing at a predetermined time described later is attached to one end of the protruding arm of the cam follower bracket 33.

The plate discharge arm pairs 8a and 8b are as shown in FIGS.
At the plate feeding position shown in FIG. 7, positioning is stopped by the plate discharging arm stopping means 35 as shown in FIG. The plate discharge arm stopping means 35 is provided with a plunger protruding solenoid 37 having a guide pin 36 provided on a side plate 39 on the printing apparatus main body side and capable of protruding in a direction parallel to the rotation center axis 6 (shown in FIG. 1). , A locking hole 38 provided near the free end of the plate discharge arm 8a for the guide pin 36 to project and fit therein.

The plate feeding arm pair 7a, 7b and the plate discharging arm pair 8a, 8b are integrally connected by the plate feeding and discharging arm joining means 40 at the plate feeding position shown in FIGS. . This plate feeding / discharging arm joining means 40
As shown in FIGS. 4 to 6, the locking pin 41 is planted at a predetermined position of the plate feeding arm 7b, and the shaft 43 is pivotally mounted at a predetermined position of the plate discharging arm 8b at one end thereof. A locking lever 45 having a fitting groove 45h that engages with the locking pin 41 at a predetermined time, and a plunger 46p fixed to a predetermined position of the plate discharge arm 8b.
Between a solenoid 46 rotatably connected to the other end of the locking lever 45 via a pin, and a pin 8p planted at a predetermined position of the plate discharge arm 8b in the vicinity of one end of the locking lever 45. And a fitting groove 45 of the locking lever 45 provided in the drawing.
It is composed of a joint spring 42 for urging the h portion in the counterclockwise direction, and a stopper 44 which is planted at a predetermined position of the plate discharge arm 8b and stops the other end of the locking lever 45.
The locking lever 45 is made of sheet metal and has a substantially L shape.

In FIGS. 1 and 4, reference numeral 50 indicates a plate making position (shown by a virtual line in the drawings) in which the thermal head 4 is brought into contact with the platen roller 3 via the master 1 during plate making, and a plate making position at the time of plate making. The thermal head contacting / separating means for selectively displacing the plate-making position (shown by a solid line in the drawing) to be separated is shown. The thermal head contacting / separating means 50 is mainly composed of a DC motor (not shown), a cam 47, a cam follower arm 48, a spring 49, and the thermal head 4, which will be described later.

A DC motor (not shown) connected to a drive shaft 47s integrally attached with a plate cam 47 is fixedly mounted on a side plate (not shown) on the main body of the printing apparatus. Also,
In the vicinity of the cam 47, a roller 4 pivotally attached to the side plate by a shaft 48s and rolling in contact with the contour peripheral surface of the cam 47.
A cam follower arm 48 with 8a is arranged.
A mounting portion for the roller 48a is formed at the base end of the cam follower arm 48, and the platen roller 3 is provided at its free end.
The thermal head 4 is attached so as to extend in a direction parallel to the axis 3s. Further, between the mounting portion of the roller 48a of the cam follower arm 48 and the shaft 48s, the other end of the tension coil spring 49, one end of which is locked to a side plate (not shown) on the printer body side, is locked. The tension coil spring 49 gives the thermal head 4 a turning tendency in the counterclockwise direction in the drawing. The thermal head 4 has a well-known configuration in which a large number of fine heating elements are arranged in a line in a direction orthogonal to the sub-scanning transport direction of the master 1, that is, in the main scanning direction.

Next, the components on the plate discharge unit 180 side will be described. As shown in FIGS. 2, 4 and 9, the winding shaft 9 has a round bar shape and has a porous structure.
It is made of an ink absorbing member made of PS (polyphenylene sulfide) resin. The other end of the master 1 fed from the plate supply roll 2 is adhered to the winding shaft 9 in advance, and when the master 1 is first wound around the outer peripheral surface of the printing drum 5, that is, when the master is initially set. For use,
The master 1 corresponding to the outer peripheral length of the printing drum 5 is wound in advance. A cutout groove 9a is formed at one end of the winding shaft 9.

In FIG. 9, reference numeral 185 indicates a plate discharge roll shaft support means. The plate discharge roll shaft support means 185 mainly includes a roll drive shaft 52 and a slide shaft 53, which will be described later.

At the free end of the plate discharge arm 8b, which is made of a pipe material, is fitted to the cutout groove 9a of the winding shaft 9 of the plate discharge roll 10 to support one end of the plate discharge roll 10. On the other hand, a roll drive shaft 52 having an engaging projection 52a protruding in a right angle direction is rotatably provided. A plate discharge roll gear 55 is fixed to the shaft end of the roll drive shaft 52. On the other hand, at the free end of the plate discharge arm 8a, a plate-shaped member having a bottomed portion is formed, and a platen for supporting the other end of the plate discharge roll 10 by loosely fitting the winding shaft 9 of the plate discharge roll 10 therein. L in the figure is parallel to the axis 3s of the roller 3.
A slide shaft 53 that is slidable in the R direction is provided.
The winding shaft 9 of the plate discharge roll 10 is fitted between the plate discharge arm 8a and the plate discharge arm 8b by engaging the engagement protrusion 52a of the roll drive shaft 52 with the notch groove 9a on one end side of the winding shaft 9, and By fitting the other end of the winding shaft 9 into the slide shaft 53, the winding shaft 9 is disposed so as to be rotatable and detachable via the roll drive shaft 52 and the slide shaft 53.

Further, the roll drive shaft 52 and the slide shaft 5
A brake unit (not shown) that prevents the roll drive shaft 52 and the slide shaft 53 from loosening in the direction opposite to the winding direction is provided at the free ends of the pair of plate ejection arms 8a and 8b near 3, and will be described later. A braking force that does not loosen when the master 1 is initially set on the outer peripheral surface of the printing drum 5 is applied.

In FIG. 4, reference numeral 54 is a plate discharge roll 1.
The plate discharge roll driving means for rotationally driving the winding shaft 9 of 0 is shown. The plate discharge roll driving means 54 includes a plate discharge winding motor 56, a drive gear 58, a connecting arm 59, and a gear 61, which will be described later.
It is mainly composed of.

A plate discharge winding motor 56 is fixedly mounted on a side plate (not shown) on the printer body side. Plate discharge winding motor 5
6, a drive gear 58 is fixed to the rotation output shaft 57. Next to the drive gear 58, there is provided a gear 61 which is rotatably supported around a shaft 61s by a connecting arm 59 at a predetermined interval and which is constantly meshed with the drive gear 58.

The oscillating motion of the connecting arm 59 for engaging or releasing the mesh between the plate discharge roll gear 55 and the gear 61 at a predetermined operation timing described later is performed by the rotation output shaft 57,
The positional relationship between the shaft 61s and the roll driving shaft 52 is such that the half line connecting the rotation output shaft 57 and the shaft 61s and the roll driving shaft 5
Since the half line connecting the shaft 2 and the shaft 61s is set to a substantially right angle or an obtuse angle larger than the right angle, it can be performed only by the rotation operation of the drive gear 58 by the rotational driving of the plate discharge winding motor 56. Has been done. That is, at the start of plate making described later, when the drive gear 58 of the plate discharge winding motor 56 rotates in the direction of arrow A in the drawing, the gear moment 61 acts via the connecting arm 59 under the action of the rotation moment of the gear.
However, it swings in a direction approaching the plate discharge roll gear 55 and meshes with the plate discharge roll gear 55, and the rotational force of the plate discharge winding motor 56 is transmitted to the roll drive shaft 52. On the other hand, at the end of plate making, the drive gear 58 of the plate discharge winding motor 56 is slightly reversely rotated in the direction opposite to the direction of the arrow A in the figure, so that the gear 61 is moved through the connecting arm 59 and the plate discharge roll gear 55. Swing in a direction away from the gear 5 for the plate discharge roll
Out of mesh with 5.

Next, the operation will be described with reference to FIGS.

First, the master initial setting in which the unused plate supply roll 2U is set in the plate supply unit 170 and is wound around the outer peripheral surface of the printing drum 5 to supply the plate will be described. First, Fig. 1
In 0, a set product of a winding shaft 9 (hereinafter also referred to as an "unused plate discharge roll") on which the master 1 corresponding to the outer peripheral length of the unused plate feeding roll 2U and the printing drum 5 is wound in advance. Among these, the unused plate discharge roll is provided with the roll drive shaft 52 and the slide shaft 5 of the plate discharge arm pair 8a, 8b.
3 (shown in FIG. 9), the leading end of the master 1 is passed over the outer peripheral surface of the platen roller 3, and the unused plate feed roll 2U is inserted through the brake unit 26 to the plate feed arm pair 7
It is set in the attachment / detachment groove 7h of a and 7b. At this time, as shown in FIGS. 1 and 4, the plate discharge unit 180 is stopped at the plate supply position shown in both figures by the operation of the plate discharge arm stopping means 35 (shown in FIG. 7). That is, in FIG. 7, when the solenoid 37 is turned on, the guide pin 36 is fitted into the locking hole 38 of the plate discharge arm 8a and the plate discharge unit 180 is stopped at the plate supply position. Further, when the solenoid 37 is turned off, the stopped state is released. In the subsequent operation, this plate discharge arm stopping means 35
The description of the stopping operation of the plate discharge unit 180 and the releasing operation thereof is omitted at any time.

Then, by pressing a master set key (not shown), the drum driving unit 230 (shown in FIG. 2) is operated while the plate discharge unit 180 remains in the plate supply position. That is, with the driving force supplied from the driving motor M,
The printing drum 5 and the plate feeding unit 170 integrally rotate in the direction of arrow A gently so that the master 1 between the winding shaft 9 and the unused plate feeding roll 2U contacts the outer peripheral surface of the plate cylinder 5. The winding shaft 9 is rotated in the counterclockwise direction due to the frictional force caused by the ink adhesion or the like. In this way, the master 1 is wound around the outer peripheral surface of the printing drum 5 while being sequentially fed out from the winding shaft 9.

At this time, the plate discharge arm pair 8a, 8b is disconnected from the printing drum 5 by the plate discharge friction clutch 16 (shown in FIGS. 2 and 3) and occupies the plate supply position. The plate feeding arm pair 7a, 7b is in a state of being connected to the printing drum 5 by a plate feeding friction clutch 15 (shown in FIGS. 2 and 3). Since a predetermined braking force is applied to the core tube 2s of the plate feed roll 2 by the brake unit 26 and similarly to the take-up shaft 9 by the brake unit, the master 1 pulled out from the take-up shaft 9 is applied. Is applied with a predetermined tension, and the master 1 can be wound around the outer peripheral surface of the printing drum 5 in a tensioned state without generating wrinkles. The thermal head 4, the drive gear 31, and the gear 61, which are supported on the printing apparatus main body side, are separated from the projecting portions of the plate feeding unit 170 and the plate discharging unit 180 by the above-mentioned means, so that there is a problem such as interference. Does not occur. Further, at this time, the cam motor of the pressure contact roller holding means 130 is driven, and the large diameter portion of the holding release cam 131 and each pressure contact roller arm 120.
The upper end surfaces of a and 120b are in contact with each other. Therefore,
By the operation of the pressure roller holding means 130, the pressure roller 1
1 is held at a non-printing position that is separated from the outer peripheral surface of the printing drum 5 by about 2 mm.

Next, as shown in FIG. 11, the printing drum 5 and the plate supply unit 170 are rotated in the direction of arrow A, and the positive cam pair 135a, 1 rotating together with the printing drum 5.
When the cam pair 136a, 136b of 35b reaches the lower vicinity of the pressure roller 11 held at the non-printing position, the large diameter portion 136c comes into contact with the bearings 122a, 122b, so that the bearings 122a, 122b contact this. It is driven and rolled, and the press contact roller arm 120 is interlocked with this operation.
rocking shaft 110 of a and 120b and pressure contact roller 11
Is swung downward around the support shaft 120s. In this way, the pressure contact roller 11 has the tension coil springs 121a, 121a.
It is separated from the projecting portions of the plate feeding roll 2 and the platen roller 3 of the plate feeding unit 170 against the biasing force of the plate 21b, and is displaced to a non-printing position where interference with these projecting portions is avoided.

At the same time, the slide claw 113c is slid relative to the fixed pin rear 114 by the operation of the sheet discharge side guide member displacement means in conjunction with the downward swing motion of the swing shaft 110. The upstream end of the discharge side guide plate 111 is swung downward in the same direction as the displacement direction of the pressure contact roller 11 around the fixing pin rear 114. Similarly, the slide claw 107c is slid with respect to the fixed pin front 108 by the operation of the sheet feed side guide member displacement means, and the opening of the pair of paper feed side guide plates 106a and 106b is centered around the fixed pin front 108. The rear portion 106r is swung downward in the same direction as the displacement direction of the pressure roller 11. In this way, the pair of paper feed side guide plates 106a and 106b and the paper discharge side guide plate 111 do not interfere with the protruding portions of the plate feed roll 2 and the platen roller 3 of the plate feed unit 170 in the same direction as the displacement direction of the pressure contact roller 11. Is displaced into position.

Next, in FIG. 12, when the winding of the master 1 on the outer peripheral surface of the printing drum 5 for a predetermined length is completed, the plate feeding unit 170 and the plate discharging unit 180 are integrated by the plate feeding and discharging arm joining means 40. Be combined with. That is, in FIG. 4 to FIG. 6, when the plate feeding arm 7b is rotated in the direction of arrow A to the vicinity of the plate feeding position, the locking pin 41
The sliding contact guide portion 45a is brought into sliding contact with the fitting groove 4
The plate pin unit 170 and the plate discharge unit 180 are integrally coupled by fitting the locking pin 41 to 5h. Up to this point is the preparation process before plate making. Also, the plate feeding unit 170
When releasing the connection between the plate and the plate discharge unit 180,
Plunger 46p due to solenoid 46 turning on
The engaging groove 45h is rotated in the direction of the arrow A through the suction operation, and the fitting between the fitting groove 45h and the locking pin 41 is released. Here, the combination of the parts in which the plate supply unit 170 and the plate discharge unit 180 are integrated by the plate supply / discharge plate joining means 40 may be simply referred to as a “plate supply / discharge unit”.

Next, at the plate feeding position shown in FIGS. 1, 4 and 13, plate making and plate discharging are performed simultaneously. When a plate making start key (not shown) is turned on, first, the image information of the document is read by a document reading device (neither is shown).
At the same time, on the plate feeding unit 170 side, the thermal head 4 is displaced to the plate making position in which the thermal head contacting / separating means 50 (shown in FIG. 4) is brought into contact with the platen roller 3 via the master 1. It That is, as shown in FIG. 4, the cam 47 is rotated by the rotation drive of a DC motor (not shown), the engagement between the large diameter portion and the roller 48a is released, and the urging force of the spring 49 causes the cam follower arm 48 to move. Rotating in the direction of arrow D, the heating element portion of the thermal head 4 passes through the master 1 and the platen roller 3
Will be pressed against.

On the other hand, at the same time as the above operation, plate making is performed with the operation of the platen roller driving means 210 as shown in FIG. That is, when the cam 32 is rotated in the direction of the arrow B in the drawing by the rotation drive of a DC motor (not shown), the cam follower bracket 33 is rotated around the shaft 33s, and the drive gear 31 meshes with the gear 30. become. At this time, the pulse motor 28 is rotationally driven, so that the gear 30 and the platen roller 3 are rotated.
Is rotated in the direction of arrow B in the drawing, the master 1 is conveyed while being sequentially pulled out from the plate feed roll 2, and the heating element portion of the thermal head 4 is also responsive to image information read from a document reading device (not shown). Is selectively heated, and holes are sequentially punched from the tip of the master 1 to perform plate making. The thermal head 4 may be driven according to the image information from a personal computer or the like, not limited to the case where the image information of the original is read by the upper original reading device.

At the same time as this plate making operation, the drum driving means 2
With the driving force supplied from the driving motor M of 30, only the printing drum 5 is rotated in the direction of the arrow B in the drawing at a speed synchronized with the peripheral speed of the platen roller 3, so that the plate-making master 1a has an outer peripheral surface of the printing drum 5. Is wrapped around. At this time, the plate discharge friction clutch 16 of the plate discharge arm pair 8a, 8b (see FIG.
(Shown in FIG. 3) and the plate feed friction clutch 15 (shown in FIG. 3) of the plate feed arms 7a and 7b are disconnected from the printing drum 5. The peripheral speed of the printing drum 5 is set to be slightly higher than the peripheral speed of the platen roller 3 in order to apply proper tension to the plate-making master 1a supplied from the platen roller 3 and wind it around the printing drum 5. There is.

Although a part of the operation diagram in which the plate-making master 1a is being wound around the outer peripheral surface of the printing drum 5 is omitted, the positive cam pair 135 that rotates together with the printing drum 5 is omitted.
When a and 135b reach the vicinity of the lower side of the pressure contact roller 11, the same operation as the operation at the master initial setting described above is performed except that only the printing drum 5 is rotationally driven in the direction of arrow B intermittently or continuously. Be seen.

In parallel with the plate making operation, as shown in FIG. 4, the plate discharging roll driving means 54 is operated to mesh the plate discharging roll gear 55 and the gear 61 on the plate discharging unit 180 side. In this state, the plate discharge winding motor 56
Is driven to rotate, the winding shaft 9 is rotated in the direction of arrow A via the roll drive shaft 52, and the used master 1b having a predetermined length (for one plate) is rolled around the winding shaft 9. Will be wound up.

After completion of plate making, in FIG. 4, the thermal head 4 is separated from the platen roller 3 via the master 1 in the direction of arrow U by the operation of the thermal head contacting / separating means 50 to occupy the non-plate making position.

At the same time, in FIG. 8, the platen roller driving means 210 operates. First, the pulse motor 2
The rotation of 8 is stopped. Then, the rotation of the DC motor causes the cam 32 to rotate further in the direction of arrow B in the figure, so that the engagement between the large diameter portion and the roller 33a is released, and the cam follower bracket is urged by the urging force of the tension coil spring 34. 33 is rotated counterclockwise about the shaft 33s. As a result, the meshing state between the drive gear 31 and the gear 30 is released, and the drive gear 31 does not interfere with the projecting portions of the plate feed roll 2, the platen roller 3 of the plate feed unit 170, and the plate discharge roll 10 of the plate discharge unit 180. Occupy a position.

On the other hand, at the same time as each of the above operations, the plate discharge roll driving means 54 in FIG. 4 operates. That is, the rotation of the plate discharge roll 10 is stopped by stopping the drive of the plate discharge winding motor 56, and then the gear 61 is separated from the plate discharge gear 55 by the above-described operation.

Then, the plate discharging unit stopping means 35 is actuated to release the stopped state of the plate discharging unit 180. From the state shown in FIG. 14, the plate feeding / discharging section and the printing drum 5 are
15 in the state shown in FIG. The plate is rotated until it reaches (the plate making initial position of the plate made master 1a).

In FIG. 15, the printing process is started.
That is, in FIG. 1, first, the sheet feeding roller 10 is loaded on the sheet feeding table 102 by the biasing force of the compression coil spring 101.
The printing paper P pressed against the sheet 3 is guided by the paper guide plate pair 105a, 105b while being driven by a motor (not shown) to rotate toward the feed roller pair 104a, 104b. Sent. Further, the printing paper P includes the feed roller pair 104a,
The paper feed side guide plate pair 106 which is displaced to the guide position by the operation of the paper feed side guide member displacing means at a predetermined timing synchronized with the rotation of the printing drum 5 by 104b.
While being guided by a and 106b, it is delivered between the outer peripheral surface of the printing drum 5 and the pressure contact roller 11. In synchronism with this operation, the cam motor of the pressure contact roller holding release means 130 is driven, and the holding release cams 131a and 131b.
Of the large-diameter portion of each of the pressure contact roller arms 120a and 120b is released, and the holding release cam 131 is released.
a, 131b small diameter part and each pressure contact roller arm 120a,
A predetermined gap is formed between the upper end surface of 120b.

Then, as shown in FIG. 1, the non-printing position state of the pressure contact roller 11 is released by the operation of the pressure contact roller holding release means 130, and the pressure contact roller 11 moves to the printing drum 5
Will occupy the printing position where it is pressed against the outer peripheral surface of the sheet through the printing paper P. That is, the plate feeding / discharging section and the printing drum 5 are rotated in the direction of the arrow B in the drawing, and the pressure contact roller 11 uniformly biased by the pair of left and right tension coil springs 121a and 121b in the entire region parallel to the axis 11s is used for printing. By pressing the plate-making master 1a wound around the outer peripheral surface of the drum 5 via the printing paper P, the ink is transferred from the perforated portion of the plate-making master 1a to the surface of the printing paper P,
The desired image of the original is printed.

At the same time, the motor connected to the drive gear 125 is driven at the same time, whereby the pressure roller 1
The above-mentioned printing is performed while 1 is rotationally driven in the direction of arrow A in the drawing at the same peripheral speed as the peripheral speed of the printing drum 5. At this time, the ink roller 20 also rotates in the same direction as the rotation direction of the printing drum 5, and supplies ink to the inner peripheral surface of the printing drum 5. In this way, the printing paper P printed is
After passing the pressure contact roller 11, it is peeled from the outer peripheral surface of the printing drum 5 by the peeling claw and is guided by the discharge side guide plate 111 which is displaced to the discharge guide position by the operation of the discharge side guide member displacement means. At the same time, the sheet is further conveyed by the sheet discharge conveying means and discharged and stacked on the sheet discharge table.

As shown in FIG. 16, after the print state of FIG. 1 has passed from the print start position of FIG. 15, the pressure contact release start portion 137f of the large diameter portion 136c rotating together with the plate feeding / discharging portion.
However, the bearing 122 of the pressure roller 11 occupying the printing position
a, 122b, the bearings 122a, 122 are rotationally driven together with the pressure contact roller 11 in the direction of arrow A in the figure.
While b rolls on the large diameter portion 136c, it is guided by the guide portions 138a, 138b in the centrifugal direction to the guide grooves 137m, 137n. In this way, the pressing roller 11 is displaced to the non-printing position where it does not interfere with the projecting portion of the plate feeding / discharging portion against the biasing force of the tension coil springs 121a and 121b.

At this time, the pressing roller arm 120
rocking shaft 110 of a and 120b and pressure contact roller 11
Is oscillated downward about the support shaft 120s, and in conjunction with the downward oscillating motion of the oscillating shaft 110, first,
By the operation of the sheet feeding side guide member displacing means, the slide claw 107c is slid with respect to the fixed pin front 108, and the sheet feeding side guide plate pair 1 is centered around the fixed pin front 108.
After the openings of 06a and 106b, 106r is the pressure contact roller 11.
The paper feed side guide plate pair 106a, 106b is displaced to the non-guide position by being swung downward in the same direction as the displacement direction. At the same time, the slide claw 113c is slid with respect to the fixed pin rear 114 by the operation of the discharge side guide member displacing means, and the upstream side end portion of the discharge side guide plate 111 is centered around the fixed pin rear 114. The pressure contact roller 11 is swung downward in the same direction as the displacement direction, and the paper discharge side guide plate 111 is displaced to the non-paper discharge guide position. (See FIGS. 16 and 17). In this way, the trial printing of the first sheet, that is, the so-called plate making is completed.

Next, by inputting the number of prints with a ten key (not shown) and pressing the print start key, the above-mentioned printing, feeding and discharging steps are repeated a predetermined number of times to perform printing. In this way, each process of plate making / plate feeding, plate discharging and printing is repeated again from the fixed position state of FIG. 1, FIG. 4 or FIG. 12, and all the master 1 wound around the plate feeding roll 2 is consumed. When the core tube 2s disappears and the master 1 is completely used, the master 1 is completely wound around the winding shaft 9 as the used master 1b, and the used master 1b becomes full. In the above-mentioned fixed position state, the core tube 2s and the winding shaft 9 of the plate discharge roll 10 filled with the used master 1b are removed and replaced with unused ones.

When the printing is completed, the cam motor of the pressure contact roller holding means 130 is driven in FIG. Are brought into contact engagement with each other, and the pressure contact roller 11 is held at a non-printing position separated by about 2 mm from the outer peripheral surface of the printing drum 5. Then, the plate feeding / discharging section and the printing drum 5 are stopped at the fixed positions.

According to the above embodiment, the bearings 122a, 122
2b and the pressure roller 11 are connected to the respective gears 125, 126, 1
By being driven to rotate by the motor via 27,
There is an advantage that the load on the printing drum 5 at the time of printing can be reduced and good printing can be performed.

19 to 25 show modifications of the embodiment shown in FIGS. 1 to 18.

FIG. 19 is a main part configuration diagram showing a stencil type plate making / printing apparatus of the above modification. First, the point that this part of the configuration differs from the stencil type plate making / making apparatus 700 of the above embodiment. Details will be centered. It should be noted that components having the same functions as those of the components shown in FIGS. In FIG. 19, reference numeral 7
Reference numeral 60 represents a stencil-type plate-making printing apparatus 760 of the above-described modification.
Reference numeral 761 indicates a frame arranged at a predetermined position of the stencil printing machine 760. Stencil plate-making printing device 760
For the stencil-type plate making and printing apparatus 700, the stencil-type plate-making and printing apparatus 700 has a plate discharge unit 180 having a plate discharge roll shaft supporting means 185 and a plate discharge roll driving means 54.
And a clamp means 70 that is rotatable about the rotation center axis 6 with respect to the printing drum 5 and the plate supply unit 170 and that clamps the other end of the master 1, and a clamper having the clamp means 70. A unit 240, a plate discharging unit 80 supported by the printing apparatus main body side for separating the used master 1b from the outer peripheral surface of the printing drum 5 and storing and discarding it are disposed in the vicinity of the plate discharging unit 80 supported by the printing apparatus main body side. Another difference is that a cutter unit 88 for cutting the used master 1b is provided.

As shown in FIG. 19, each positive cam 135 is
a, 135b cam 136a, 136b large diameter portion 136
c (indicated by phantom lines) is an unused plate feeding roll 2U of the plate feeding unit 170 and the platen when the plate feeding unit 170 and the clamper unit 240 are located at the fixed positions (also referred to as plate feeding positions) shown in FIG. The roller 3 and the clamper unit 240 are set so as to cover the outermost protruding portions such as the free end portion.

The plate discharging unit 80 and the cutter unit 88 form a plate discharging unit 250.

The structures of the clamper unit 240, the plate discharging means 80 and the cutter unit 88 will be described below.

The clamper unit 240 mainly includes a clamper arm pair 68a, 68b, a clamper friction clutch 64, a balancer weight 69, a plate discharge assisting plate 65, and a clamp means 70, which will be described later.

19 and 20, each drum shaft 1
A plate feeding arm pair 7a, 7b is provided on the inner side of 3a, 13b with the printing drum 5 interposed therebetween, and a clamper arm pair 68a, 68b is provided on the outer side thereof with respect to the rotation center shaft 6 via bearings not shown. It is movably arranged. The bases of the clamper arms 68a and 68b are connected to the drum shafts 13a and 13b via the clamper friction clutch 64, respectively. As will be described later, the clamper friction clutch 64 connects the clamper arms 68a and 68b and the drum shafts 13a and 13b to rotate them integrally at the time of initial master setting and printing, and at the same time, at the time of plate making and plate discharge. Each clamper arm 68a, 68b and drum shaft 13b, 13
It is set so as to cut off the connection with b. Similar to the plate-feeding friction clutch 15, the clamper friction clutch 64 can be manually disengaged for manual operation at the time of jam.

In FIG. 21, each clamper arm 68 is
A balancer weight 69 made of a material of specific importance is fixed to the a and 68b at symmetrical positions with respect to the rotation center shaft 6 for maintaining the rotation balance. The balancer weight 69 has a substantially fan shape in a side view, and has a rotation center axis 6
The size and weight of the clamper unit 240 are set so as to balance with the rotational moment component of the clamper unit 240. As will be described later, in the printing process, the printing drum 5, the plate feeding unit 170, and the clamper unit 240.
Rotate together at high speed. At this time, since the balancer weights 51A and 69 are provided as described above, the integrated body as a whole has a better rotational balance and a smaller load fluctuation during rotation, and thus is more stable. High-speed printing is possible. The balancer weights 51A and 69 are shown only in FIG. 20, and are omitted in the other drawings for the sake of simplicity.

The plate feed arm pair 7a, 7b has the same structure as the plate discharge arm stop means 35 shown in FIG. 7 at the fixed position shown in FIG. It is designed to be stopped by (not shown). The plate feeding arm stopping means is the side plate 3
A projecting solenoid (not shown) having a guide pin, which is provided at 9 and can project in a direction parallel to the rotation center axis 6.
And a locking hole 29 provided on an upper portion of the plate feeding arm 7a for allowing a guide pin (not shown) to project and fit therein.

The plate feeding arm pair 7a, 7b and the clamper arm pair 68a, 68b are integrated by the plate feeding / discharging arm joining means 40 having the same structure as shown in FIGS. 4 to 6 at the time of plate making / discharging and printing. To be combined.

19 and 20, the plate discharge assisting plate 65 is provided between the free ends of the clamper arm pairs 68a and 68b.
Is fixed. The plate ejection assisting plate 65 has a flat plate shape and is made of a ferromagnetic material. A master guide roller 66 for smoothly guiding the master 1 to the downstream side of the master transport path Ro is rotatably provided at one end of the plate discharge assisting plate 65.

The clamp means 70 includes a pair of bearing members 73a and 73b fixed on both sides of the master conveyance path Ro and fixed on the plate discharge assisting plate 65, and these bearing members 73a and 7b.
It is mainly composed of a clamper shaft 72 which is rotatably supported by 3b, and a clamper 71 which is attached to the clamper shaft 72 and has a rubber magnet which can be opened and closed with respect to the plane portion of the plate discharge auxiliary plate 65. A clamp gear (not shown) is fixed to one end of the clamper shaft 72. The clamper 71 is shown in FIG.
At a plate feeding position shown in 0, a drive gear (not shown) of the opening / closing means arranged on the main body of the printing apparatus and the above-mentioned clamp gear mesh with each other, thereby opening / closing a predetermined angle. . An opening is formed between the bearing members 73a and 73b to form a master transport path Ro through which the master 1 or the used master 1b can pass.

The plate discharging means 80 is composed of a pair of plate discharging arms 81a and 81b, a pair of plate discharging rollers 84 and 85, a storage box 83, a rotation transmitting member and a drive motor (both not shown) which will be described later.

In FIG. 21, reference numeral 84 is a drawing roller, and reference numeral 85 is a winding roller that rotates by being pressed against the drawing roller.
5 is simply referred to as a "plate discharge roller pair 84, 85"). The plate discharge roller pairs 84 and 85 are made of synthetic rubber, are provided to extend in a direction parallel to the rotation center shaft 6, and are connected to the shaft 85s of the winding roller 85 (a rotation transmission member (not shown)). Is rotated by a drive motor (not shown). A pair of plate ejection rollers 81a and 81b (hereinafter, sometimes referred to as "plate ejection arm pair 81a and 81b") made of aluminum alloy are provided at both ends of the plate ejection roller pair 84 and 85, respectively. , 85 are rotatably supported by the plate ejection arms 81a and 81b. The base ends of the plate ejection arms 81a and 81b are swingably supported by a shaft 82 fixed to a side plate (not shown) on the printing apparatus main body side. A storage box 83 for storing the used master 1b is provided between the plate ejection arms 81a and 81b.
However, the plate discharging rollers 84 and 85 extend in parallel with the respective shafts 84s and 85s and are detachably provided. The used master 1b separated and conveyed by the plate discharge roller pair 84 and 85 is provided at one end of the storage box 83 located on the downstream side of the holding portion of the used master 1b which is separated by the plate discharge roller pair 84 and 85. A storage opening 83h for receiving is provided.

A cutter unit 88 is provided immediately downstream of the holding portion of the used master 1b separated by the pair of plate discharge rollers 84 and 85.

The cutter unit 88 is the used master 1b.
Cutter motor 8 having a rotary blade 87a for cutting
7 and the cutter motor 87 while supporting the cutter motor 87 in the axial directions 84s, 85 of the pair of plate discharge rollers 84, 85.
It has a transfer mechanism (not shown) for transferring in the s direction, that is, in the width direction of the used master 1b separated by the pair of plate discharge rollers 84 and 85. The transfer mechanism (not shown) is, for example, a rail (not shown) provided on the peripheral wall of the storage box 83 near the rotary blade slit 86, and a self-propelled mechanism that is attached to the cutter motor 87 and operates in conjunction with the rotation of the rotary blade 87a. Consists of. The cutter motor 87 is usually the plate discharge arm 81.
It is waiting on the one side of b, and the pair of plate discharge rollers 84, 85
There is no hindrance to the storage of the used master 1b peeled off in the storage box 83. A rotary blade slit 86 for guiding the rotary blade 87a of the cutter motor 87 is opened near the upper portion of the storage opening 83h of the storage box 83.

As shown in FIG. 19, the plate discharging arm pair 81
Plate cams 91 fixed to shafts 91s that are rotatably supported by side plates (not shown) on the main body of the printing apparatus are provided at substantially central portions of the back surfaces of the a and 81b. Cam 91
Is driven to rotate by a DC motor (not shown) at a predetermined operation timing described later. At the free ends of the plate ejection arm pair 81a, 81b, the other end of a tension coil spring 92, one end of which is retained by a side plate (not shown) on the printing apparatus main body side, is retained. Pair 81a, 8
1b is always given a turning tendency in the clockwise direction in the figure.

Reference numeral 90 indicates a peeling position (indicated by a phantom line in the drawing) for displacing the plate discharging means 80 during plate discharging to separate the used master 1b on the outer peripheral surface of the printing drum 5, and for separating from the peeling position during non-plate discharging. A plate discharge means displacement mechanism for selectively displacing the plate discharge means 80 at a non-peeling position (shown by a solid line in the figure) is shown. The plate discharging means displacement mechanism 90, as described above,
It is mainly composed of a DC motor (not shown), a cam 91 and a spring 92.

Reference numeral 95 is a cutter unit 88 when the plate is discharged.
The cutter unit 88 is selectively moved to a cutting position (shown by a phantom line in the drawing) located near the plate discharging position and a non-cutting position (shown by a solid line in the drawing) separated from the cutting position during non-printing. 3 shows a cutting means displacement mechanism for displacing. The cutting means displacement mechanism 95 has the same configuration as the plate discharge means displacement mechanism 90.

When a jam occurs during the transportation of the master 1, the plate discharging means displacing mechanism 90 and the cutting means displacing mechanism 95 operate to occupy the non-peeling position and the non-cutting position, and the plate discharging means 80 and the cutter unit. 88 is separated from the printing drum 5. The plate discharging means displacing mechanism and the cutting means displacing mechanism are not limited to those described above, and may have the same configuration as the thermal head contacting / separating means 50.

In the stencil-type plate making and printing apparatus 760, the master 1 is supplied by the plate supply roll 2, the used master 1b discharged from the plate is peeled while being wound by the plate discharging means 80, and the rear end is cut by the cutter unit 88, The clamper 71 clamps the tip of the master 1.

Next, the operation of this modified example will be described with reference to FIGS. 19 to 25 in combination with FIGS.

19 to 25, the ink supply means 200, each component of the plate supply unit 170, each component of the plate discharge unit 180, the positive cam pair 135a,
Each component of 135b, paper feed side guide plate pair 106a, 1
06b, each component of the paper feed side guide member displacing unit, the paper ejection side guide plate 111, each component of the paper ejection side guide member displacing unit, the drive gear 125, the idler gear 126, the roller gear 127, and the pressure contact roller holding release unit. Pressing roller holding means 130, locking hole 2 of the plate feeding arm stopping means
9, brake unit 26, plate feeding / discharging arm joining means 4
0, thermal head contact / separation means 50, cutter unit 8
8, detailed components constituting the plate discharging means displacing mechanism 90, the cutting means displacing mechanism 95 and the like are omitted as occasion demands for simplifying the explanation. Also, the pressure contact roller holding means 1
30 or the operation of the pressure contact roller holding release means 130, the operation of contacting and separating the pressure contact roller 11 with respect to the printing drum 5, the driven operation of the bearings 122a and 122b with respect to the positive cam pairs 135a and 135b, and the paper feed by the paper feed side guide member displacement means. The displacement operation of the pair of side guide plates 106a and 106b, the displacement operation of the sheet discharge side guide plate 111 by the sheet discharge side guide member displacing means, and the like are basically performed in the same manner as in the above-described embodiment, and therefore the description thereof is omitted.

As shown in FIG. 22, an unused plate feeding roll 2
During the initial master setting of U on the plate feed roll shaft support means 175, the plate feed unit 170 is stopped at the plate feed position shown in the figure by the operation of the plate feed arm stopping means.

First, the core tube 2s of the unused plate supply roll 2U is set in the attachment / detachment groove 7h through the brake unit 26. Next, the leading end of the master 1 is pulled out from the unused plate supply roll 2U, the leading end of the master 1 is passed over the outer peripheral surface of the platen roller 3, and the leading end of the master 1 is set on the clamp means 70. The setting of the leading end portion of the master 1 on the clamp means 70 is inserted into the master conveyance path Ro forming the lower opening portion of the expanded clamper 71 and is taken out to the downstream side of the plate discharge auxiliary plate 65, and then shown in the drawing. No Press the master set key. Then, the opening / closing means is operated to close the clamper 71, and the leading end portion of the master 1 is sandwiched and locked between the plate discharge assisting plate 65 and the clamper 71. In addition, FIG. 23 shows the state of the master initial setting,
It also shows the condition when jamming and resetting.

Next, the plate feeding unit 170 remains in the plate feeding position, and the printing drum 5 and the clamper unit 2 are driven by the driving force supplied from the drum driving means 230 (shown in FIG. 2).
When 40 is united and gently rotated in the direction of arrow B, the master 1 is wound around the outer peripheral surface of the plate cylinder 5 while being sequentially fed out from the plate feed roll 2 through the driven rotation of the platen roller 3. Go. At this time, the plate feeding arm pair 7a,
7b is disengaged from the printing drum 5 by the plate supply friction clutch 15 (shown in FIG. 20) and occupies the plate supply position, while the clamper arm pair 68a, 68b.
Shows a state in which the clamper friction clutch 64 (shown in FIG. 20) is connected to the print drum 5. In this way, the master 1 is sequentially fed from the plate supply roll 2 while a predetermined tension is applied by the brake unit 26, and is wound around the outer peripheral surface of the printing drum 5 without generating wrinkles (see FIG. 23).

When the winding of the master 1 on the outer peripheral surface of the printing drum 5 for a predetermined length is completed, the clamper unit 240 and the plate feeding unit 170 are integrated by the plate feeding and discharging arm joining means 40 as shown in FIG. Are combined together,
At this plate feeding position, the printing drum 5 and the clamper unit 240 stop.

Next, as shown in FIG. 19, when a plate making start key (not shown) is pressed (turned on) at the plate feeding position, the same plate making operation as in the above embodiment is performed, and at the same time,
The characteristic plate ejection operation of this modification is simultaneously performed as follows. In FIG. 19, the plate discharge means 80 is simultaneously displaced to the plate discharge position by the operation of the plate discharge means displacement mechanism 90, and at the same time, the cutter unit 88 is simultaneously displaced to the position occupying the cutting position by the operation of the cutting means displacement mechanism 95. That is, when the cam 91 is rotated by a drive motor (not shown), the plate ejection arm pairs 81a and 81b are rotated about the shaft 82 in the counterclockwise direction indicated by an imaginary line against the biasing force of the spring 92. It At approximately the same time, on the clamper unit 240 side, the opening / closing means is actuated to open the clamper 71 by a predetermined angle.
The locked state of the leading end of the master 1 between the plate and the plate discharge assisting plate 65 is released. In this way, the plate discharge roller pair 84, 8
The drawing roller 84 of 5 draws in the rotational direction while pressing the used master 1b with the ink passing therethrough, which passes through the master conveyance path Ro between the plate discharge assisting plate 65 and the clamper 71, and the leading end of the used master 1b. If 1f is gripped by the nip of the rotating pair of plate discharge rollers 84 and 85, the plate discharge is continued while being peeled and conveyed, and if it is determined that the predetermined amount (one plate) of plate discharge is completed, the cutter motor 87 rotates. It is driven and the rear end of the used master 1b is cut by the rotary blade 87a and stored in the storage box 83.

Then, by the same operation as in the above embodiment,
A test printing (printing) and a printing process are performed (see FIGS. 24 and 25). In this way, the steps of plate making / plate feeding, plate discharging and printing are repeated again from the state shown in FIG. 20, and when the master 1 wound around the core tube 2s of the plate feeding roll 2 is no longer consumed, this used 2 s of the core tube is removed, and an unused plate feed roll 2U is replaced with a plate feed roll shaft support means 1
It will be set to 75. Also, the storage box 83
The used master 1b stored inside is discarded together with the box.

In the initial master setting of the above embodiment, the master 1 corresponding to the outer peripheral length of the printing drum 5 is preliminarily wound around the winding shaft 9 to perform the master attachment / detachment and the plate discharge. Although the master 180 is wound around the outer peripheral surface of the printing drum 5 by stopping the unit 180 at the plate feeding position and rotating the printing drum 5 and the plate feeding unit 170 together, the printing drum 5 rotates by a predetermined rotation angle. In the case where it is premised that some slippage based on the difference between the outer peripheral length corresponding thereto and the winding length of the master 1 around the outer peripheral surface of the printing drum 5 by rotating the plate feeding unit 170 by a predetermined rotation angle is allowed. Does not necessarily have to be this way. That is, the master 1 corresponding to the outer peripheral length of the printing drum 5 is not wound around the winding shaft 9 in advance, and the master 1 fed from the plate supply roll 2 is slipped on the outer peripheral surface of the printing drum 5 to some extent. One winding may be performed. This can be applied correspondingly to the above modification. That is, in this case, the clamper unit 240 is stopped at the plate feeding position and the like, and the tip of the master 1 is clamped by the clamper 71.
The plate feeding unit 170 is locked with the printing drum 5
The master 1 is wound around the outer peripheral surface of the printing drum 5 by rotating the master drum 1 together with.

As described above, according to the above-mentioned embodiment and the above-mentioned modification, since the cutter for cutting the master as in the conventional stencil printing apparatus is not necessary, even if the master to be used is very thin, Even if it is composed of only the thermoplastic resin film, no trouble occurs during transportation.

Further, according to the above-mentioned embodiment and modification,
Since the thermal head 4 serving as a plate-making means that can be brought into and out of contact with the platen roller 3 is provided on the printing apparatus main body side, it is not necessary to rotate the heavy and large thermal head 4 integrally with the printing drum 5. Further, also in supplying an electric signal to the thermal head 4, it is not necessary to use an expensive and unreliable one such as a rotary coupling connector used in the apparatus described in Japanese Patent Publication No. 5-70595. .

Further, according to the above-mentioned embodiments, etc., the plate discharge roll 1
Since the printing apparatus main body side has the plate discharge roller driving means 54 for rotationally driving the take-up shaft 9 of 0 and the platen roller driving means 210 for driving the platen roller 3, it is necessary to rotate integrally with the printing drum 5 during printing. In addition, the inertia can be reduced.

Further, according to the above embodiment, the printing drum 5, the plate feeding unit 170, and the plate discharging unit 180 operate in the correct positional relationship with respect to the printing apparatus main body side and relatively to each other. Can be used less.

Further, according to the above embodiment, the plate feeding unit 1
The plate discharge unit 70 and the plate discharge unit 180 have a plate discharge arm stopping unit 35 and a plate supply / discharge arm joining unit 40 that position the master 1 adjacent to the printing drum 5 in a state where the master 1 is not wound around the outer peripheral surface of the printing drum 5. Therefore, the plate supply roll 2 and the plate discharge roll 10 can be replaced as a set. Even when a master jam or wrinkle occurs, the plate supply roll 2 and the plate discharge roll 10 can be set and exchanged, and the jam can be easily corrected by manually performing the correction operation and then resetting. Treatment and wrinkle removal can be performed.

According to the above modification, since the used master 1b is cut at the end of plate discharge, the leading end of the master 1 is always on the downstream side wound around the printing drum 5 after the initial setting, which is different from the conventional case. In addition, the master 1 does not have to be conveyed to the printing drum 5, and there is no difficulty in conveyance.

According to the above modification, since the master 1 is set by using the clamp means 70, a prior art example (apparatus disclosed in Japanese Patent Publication No. 5-70595).
It is easier to set than the one using the plate discharge roll as shown in. Even if the master 1 is cut due to a jam, the one using the plate discharge roll as shown in the prior art example is to wind the master around the printing drum and then cut the tip of the master onto the plate discharge roll by some means. There is a problem that must be attached, but in the case of the above modification,
Since it suffices to clamp the cut front end of the stencil master on the clamper 71, the jam can be easily removed. Even when the master is not jammed due to jamming, the one shown in the prior art example is difficult to jam because the thermal head 4 remains in the vicinity of the platen roller 3 and becomes an obstacle. In that respect, according to the above-described modification, the thermal head 4 is moved from the platen roller 3 at the time of jamming,
Since the plate discharging unit 80 is separated from the printing drum 5, it is easy to remove the jam.

Further, the above-mentioned prior art example is disadvantageous in high-speed printing because it has a large inertia because it has a plate discharge roll as well as a plate discharge roll, and the rotation balance is greatly disturbed. For example, since there is no plate discharge roll, the inertia can be reduced, high speed printing can be performed by providing the balancer weight, the mechanism can be simplified, and at the same time, it is advantageous for downsizing of the apparatus.

Although the plate discharge arm stopping means 35 is provided only on the plate discharge arm 8a side in the above-described embodiments and the like, it is not limited to this and may be additionally provided on the plate discharge arm 8b side. Similarly, the plate feeding / discharging arm joining means 40 is
In the above-described embodiments and the like, it is provided only on the plate feeding arm 7b side and the plate discharging arm 8b side, but the present invention is not limited to this, and may be additionally provided on the plate feeding arm 7a side and the plate discharging arm 8a side. Further, the plate supply friction clutch 15, the plate discharge friction clutch 16 and the clamper friction clutch 64 are provided on both sides of each drum shaft 13a, 13b, respectively, but the invention is not limited to this, and either the drum shaft 13a or the drum shaft 13b may be used. It may be provided on one side.

Incidentally, the stencil-type plate-making / printing apparatus 700, 760
The plate feed roll shaft support means is not limited to the above, and may have the same structure as the plate discharge roll shaft support means 185. Similarly, the plate discharge roll shaft support means in the above-described embodiments and the like is not limited to the above-mentioned one, and a plate supply roll shaft support means 175 having the same configuration may be used.

In each of the above examples, the master has a thickness of 3 μm.
However, it can be used in a good condition even at 2 to 10 μm. Further, in each of the above examples, the master consisting essentially of the thermoplastic resin film was used, but not limited to this,
It goes without saying that a conventional stencil master using Japanese paper or the like as a porous support, or an extremely thin porous support can also be used.

In the above-described embodiment and modification, the cams 136a and 136b have the large-diameter portion 13 thereof.
6c are arranged so as to have the same phase position on both sides of the printing drum 5 on both sides of the printing drum 5, but the present invention is not limited to this, and the bearings 122a and 122b of the pressure roller 11 rotate at both ends with a rigid support receiving structure. In the contact / separation mechanism of the press contact roller having the structure that is supported so as to be possible, the cam and the cam follower may be attached so as to engage with each other only on one side.

According to the first aspect of the invention, the plate discharging means for separating the used master by separating the used master from the outer peripheral surface, and rotatable about the central axis of rotation of the printing drum with respect to the printing drum, At least the plate supply / discharge plate unit having the master supply unit is not limited to the configurations of the above-described embodiment and the above-described modified example, and for example, the plate supply roll described in Japanese Patent Application No. 5-132164 already proposed by the applicant of the present application. A plate feeding and discharging unit which has a supporting unit, a plate discharging roll supporting unit, and a platen roller and is rotatable with respect to the printing drum around the same axis as the rotation center axis of the printing drum, for example, already proposed by the applicant of the present application. Japanese Patent Application No. 5-275690
Plate supply unit 70 and plate discharge unit 80 described in No.
Or the like, or a landing / discharging unit described in Japanese Patent Publication No. 5-70595. The characteristic configurations described in the above-mentioned embodiments and modifications may be applied to these.

Therefore, according to the first aspect of the invention, the master for stencil is wound around the outer peripheral surface of the printing drum and the ink is supplied to the inner peripheral surface of the printing drum which rotates around the rotation center axis. A master supply unit for winding and storing one end of the master in a roll shape, a plate making unit for making the master, a plate discharging unit for separating and storing the used master by separating the used master from the outer peripheral surface, and the rotation center A plate feeding / discharging unit that is rotatable about an axis and that has at least the master supply unit, a printing position in which the printing drum is pressed against the printing drum via a printing sheet, and a non-separating unit that is separated from the printing drum. A stencil-type plate-making printing apparatus comprising: a press roller that selectively occupies a printing position,
A cam that is provided substantially coaxially with the rotation center axis at the end of the printing drum and that is substantially integral with the printing drum and has a large diameter portion on a part of its peripheral surface. And a cam for selectively displacing between the non-printing position and the non-printing position, and a cam follower for the pressure contact roller, which is provided on the shaft of the pressure contact roller and is driven by the cam.
Any structure may be used as long as it includes a pressing roller biasing means for biasing the pressing roller cam follower in a direction in which the pressing roller cam follower is pressed against the cam.

[0139]

As described above, according to the first aspect of the invention, the pressing roller urging means urges the pressing roller cam follower in the direction in which the cam and the pressing roller cam follower are pressed against each other, and the plate By engaging the cam and the cam follower for the pressure contact roller in synchronization with the rotation of the cylinder, the pressure contact roller is selectively displaced between the printing position and the non-printing position, and uniformly presses against the plate cylinder at the printing position. In the non-printing position, it does not interfere with the master supply unit or the like arranged in the plate supply / discharge unit. Further, since the print drum and the cam rotate integrally, the press contact and the press release of the print drum and the press contact roller via the cam follower for the press contact roller are performed reliably and gently, and the operating position thereof is stable. Therefore, it is possible to obtain a stencil-type plate-making printing apparatus which is small and lightweight, and which can reduce vibration and noise.

According to the second aspect of the invention, guide means for guiding the cam follower for the pressure contact roller is provided outside the cam at the pressure contact release start position and / or the pressure contact release end position of the pressure contact roller in the non-printing position. Since it is arranged, the press contact between the printing drum and the press contact roller and the release of the press contact through the cam follower for the press contact roller can be performed more reliably and smoothly. To be

According to the third aspect of the present invention, the pressure contact roller holding means holds the pressure contact roller at the non-printing position at the non-printing position during non-printing. On the other hand, at the time of printing, the holding of the pressure contact roller by the pressure contact roller holding release means is released by the pressure contact roller holding release means, so that the pressure contact roller can be freely swung by the cam and the cam follower for the pressure contact roller which follows this. .

According to the fourth aspect of the invention, the paper feed side guide member displacing means causes the paper feed side guide member to move between the guide position and the non-guide position in association with the press contact and separation of the press contact roller to the print drum. The sheet feeding side guide member, which is conventionally installed away from between the printing drum and the pressure contact roller in order to avoid the interference with the projecting portion due to the rotation of the plate feeding / discharging unit, is changed. It can be installed in the vicinity of the pressure roller, and stable paper feeding and printing can be performed regardless of the type of printing paper. Therefore, for example, it is possible to feed and print even a soft printing paper that is less stiff than plain paper.

According to the fifth aspect of the present invention, the paper discharge side guide member displacing means causes the paper discharge side guide member to interlock with the pressure contact and separation of the pressure contact roller to the print drum and the non-paper discharge guide position. Since it is selectively displaced to the paper guide position, conventionally, the paper discharge unit installed separately from between the printing drum and the pressure contact roller in order to avoid interference with the projecting portion due to the rotation of the plate supply / discharge unit. The side guide member can be installed in the vicinity of the pressure roller, and stable printing and paper discharge can be performed regardless of the type of print paper. Therefore, it is possible to print and eject even a soft printing paper that is less stiff than plain paper.

[Brief description of drawings]

1 is a partial cross-sectional side view of a main part of a stencil-type plate making and printing apparatus showing an embodiment of the present invention, showing a partial cross section taken along the line I-I of FIG. 2;

FIG. 2 is a vertical cross-sectional view of the main parts around the plate supply / discharge unit of FIG. 1, showing a cross section in which the plate supply unit and the plate discharge unit are in a superposed state.

FIG. 3 is a longitudinal sectional view of a main part around the plate supply / discharge unit of FIG. 1, showing a cross section in which the plate supply unit and the plate discharge unit are in different overlapping states.

FIG. 4 is a side view of a main part showing a configuration around a thermal head contact / separation unit and a plate discharge roll driving unit.

FIG. 5 is a plan view of a plate feeding / discharging arm joining unit.

FIG. 6 is a partial cross-sectional side view of the plate feeding / discharging arm joining means.

FIG. 7 is a front view, partially in section, showing the structure around the plate discharge arm stopping means.

FIG. 8 is a partial cross-sectional side view showing the configuration around the platen roller driving means.

FIG. 9 is a partial cross-sectional front view showing essential parts of a plate discharge roll shaft support means, a plate discharge roll, and a winding shaft.

FIG. 10 is a partial cross-sectional side view showing the operation at the time of initial master setting in the above embodiment.

FIG. 11 is a partial cross-sectional side view of the essential parts showing the operation at the time of initial master setting in the above-described embodiment.

FIG. 12 is a side view of the essential parts showing the master initial setting end and the plate feeding position state of the above embodiment.

FIG. 13 is a side view of an essential part showing the operation at the start of plate making and plate discharge in the above embodiment.

FIG. 14 is a side view of the essential parts showing the operation at the start of plate making and plate discharge in the above embodiment.

FIG. 15 is a side view of the main part showing the operation at the start of printing in the above embodiment.

FIG. 16 is an enlarged partial cross-sectional side view of the essential part showing the operation of the pressure contact roller at the start of pressure contact release during printing in the embodiment.

FIG. 17 is an enlarged partial cross-sectional side view of the main part showing the operation when the pressure contact of the pressure contact roller is released during printing in the embodiment.

FIG. 18 is a partial cross-sectional side view of the main part showing the apparatus rest state during non-printing in the above-described embodiment.

FIG. 19 is a partial cross-sectional side view showing the configuration of the main parts of a modification of the above embodiment.

FIG. 20 is a vertical cross-sectional view of the main parts around the plate supply / discharge unit of the modified example, showing a cross section in which the plate supply unit and the clamper unit are in an overlapping state.

FIG. 21 is a side sectional view of an essential part showing the configuration of the essential part of the plate discharge unit of the modified example.

FIG. 22 is a side view of the essential parts showing the operation at the time of initial master setting in the above modification.

FIG. 23 is a side view of the essential parts showing the completion of the master initial setting and the plate feeding position state of the modified example.

FIG. 24 is a side view of the main part showing the operation at the start of printing in the above modification.

FIG. 25 is a side view of essential parts showing the operation of the pressure contact roller at the start of pressure contact release in the middle of printing in the modified example.

[Explanation of symbols]

1 Master for stencil 1a Plate making master 1b Used master 2 Plate feeding roll 2s Core tube as plate feeding roll axis 2U Unused plate feeding roll 3 Platen roller 4 Thermal head as plate making means 5 Printing drum 6 Rotation center axis 7a , 7b Plate feeding arm pair 8a, 8b Plate discharging arm pair 9 Winding shaft as plate discharging roll shaft constituting plate discharging means 10 Plate discharging roll 11 as plate discharging means 11 Pressing roller 68a, 68b Clamper arm pair 70 Clamping means 80 Plate discharging means 106a, 106b Paper feed side guide plate pair as paper feed side guide member 111 Paper ejection side guide plate as paper ejection side guide member 120a, 120b Pressure contact roller arm pair 120s Spindles 121a, 121b Tension coil as biasing means for pressure contact roller Springs 122a, 122b as cam followers for pressure contact rollers Pressure roller holding means 136a which also serves as a receiving 130 pressure roller hold releasing means, 136 b cam pair 170 plate feed unit 175 plate feed roll shaft support means 180 plate discharge unit 185 plate discharge roll shaft support means 200 ink supplying means 240 clamper unit

Claims (5)

[Claims] 1. A printing drum having a master for stencil wound around an outer peripheral surface thereof and rotating about a central axis of rotation, an ink supplying means for supplying ink to an inner peripheral surface of the printing drum, and one end of the master being rolled. A master supply unit for winding and storing the master in a circular shape, a plate making unit for making a plate for the master, a plate discharging unit for separating and storing a used master by separating it from the outer peripheral surface, and a printing drum around the rotation center axis. It is rotatable with respect to one another, and at least selectively occupies at least a plate feeding / discharging unit having the master supply section, a printing position in pressure contact with the printing drum via a printing sheet, and a non-printing position spaced from the printing drum. In a stencil-type plate-making printing apparatus including a pressure contact roller, the above-mentioned printing plate having a large diameter portion on a part of a peripheral surface is provided coaxially with the rotation center axis at an end portion of the printing drum. A cam substantially integrated with the ram, for selectively displacing the pressure contact roller between the printing position and the non-printing position, and the cam provided on the shaft of the pressure contact roller. A stencil plate making / printing apparatus comprising: a cam follower for a pressure contact roller, which is driven by the follower; and a biasing means for a pressure contact roller, which biases the cam follower for the pressure contact roller in a direction in which the cam follower is pressed against the cam. 2. The stencil printing machine according to claim 1, wherein a cam follower for the pressure contact roller is provided outside the cam at the pressure contact release start position and / or the pressure contact release end position of the pressure contact roller at the non-printing position. A stencil-type plate-making printing apparatus, characterized in that guide means for guiding the sheet is arranged. 3. A stencil printing machine according to claim 1 or 2, wherein both ends of said pressure contact roller are rotatably supported by pressure contact roller arms which are swingable about a spindle. When occupying the non-printing position, a pressure contact roller holding means for holding the pressure contact roller at that position, and the pressure contact roller occupying the print position during printing,
A stencil-type plate making and printing apparatus comprising: a pressure-contact roller holding release means for releasing the pressure-contact roller holding means holding the pressure-contact roller. 4. A stencil-type plate-making printing apparatus according to claim 1, 2 or 3, wherein a printing paper is provided between said printing drum and said pressure contact roller, which is provided on the upstream side of the paper transport path near said pressure contact roller. The paper feed side guide member that is displaceable between a guide position for guiding the paper and a non-guide position separated from this guide position, and the paper feed side guide member in conjunction with the press contact and separation of the press contact roller to the print drum. And a sheet feeding side guide member displacing means for selectively displacing the guide sheet to the guide position and the non-guide position. 5. The stencil printing machine according to claim 1, 2, 3 or 4, wherein between the printing drum and the pressure roller, which is provided on the downstream side of the paper transport path near the pressure roller. A discharge side guide member that is displaceable between a discharge guide position that guides discharged print sheets to the downstream side and a non-discharge guide position that is separated from the discharge guide position; and the discharge side guide member. A discharge-side guide member displacing means for selectively displacing the discharge-contact guide position and the non-discharge guide position in conjunction with the pressure contact and separation of the pressure-contact roller to the print drum. Characteristic stencil plate making and printing equipment.