JP2000168219A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably deliver a print sheet onto a delivery base. SOLUTION: A paper cylinder 1 for holding a print sheet on its outer periphery is rotated at a circumferential speed V3. Four plate cylinders 4 are provided on a periphery of the cylinder 1. An ink supply means 8 is disposed in each cylinder 4. Stencil base sheets engraved according to colors are mounted on outer peripheries of peripheral walls of the cylinders 4. A delivery pawl 10, a pinch roll 11, and a delivery roll 14 having a circumferential speed V4 are provided near the cylinder. A conveying mechanism 20 having a conveying speed V is provided near the roll 14. The respective sections are driven so as to satisfy V3<V4<V5, and printed. A conveying speed V of a print sheet 9 to be conveyed by the roll 14 and the roll 11 is the same as the speed V3 of the cylinder 1 during printing since an intermediate part is sandwiched between the roll 11 and the roll 14. When printing is finished, the sheet 9 is flown out from a flying base 24 at a speed V5 by the mechanism 40, and collided with a collision plate 26, and superposed on a delivery base 25. Even when printed at a low speed, the sheet 9 can be delivered at a sufficient delivery speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper discharge mechanism of a stencil printing apparatus, and more particularly to a stencil printing apparatus capable of stably discharging paper by controlling a paper discharging speed.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a conventional stencil printing apparatus. The cylindrical plate cylinder 100 is rotatable about its own axis. The peripheral wall of the plate cylinder 100 is ink-permeable. Inside the plate cylinder 100, ink supply means for supplying ink to the inner peripheral surface of the peripheral wall is provided. A clamp device 101 for fixing the leading end of the stencil sheet is provided on the outer peripheral surface of the peripheral wall of the plate cylinder 100. The stencil sheet whose leading end is fixed by the clamp device 101 is wound around the outer peripheral surface of the plate cylinder 100.

[0003] Below the plate cylinder 100, a cylindrical paper cylinder 10 is provided.
2 is provided rotatably. The paper cylinder 102 has a predetermined rigidity and does not deform during printing. Paper cylinder 1
The outer diameter of 02 is substantially the same as the outer diameter of the plate cylinder 100. Paper cylinder 1
The axis 02 is parallel to the axis of the plate cylinder 100. Paper cylinder 10
2 is disposed at a position substantially in contact with the plate cylinder 100.
On the outer peripheral surface of the paper cylinder 102, a holding claw 103 for holding the leading end of the printing paper is provided. A concave portion 104 is formed on the outer peripheral surface of the paper cylinder 102 in order to avoid interference with the clamping device 101 of the plate cylinder 100.

[0004] The plate cylinder 100 and the paper cylinder 102 are rotated in synchronization with each other in the opposite directions to each other, transport the printing paper therebetween, and perform stencil printing on the printing paper.

A paper feed roll 106 is provided above the printing paper mounting table 105. A timing roll 107 is provided between the paper feed roll 106 and the plate cylinder 100. On the discharge side of the plate cylinder 100, printing paper is
0, a pinch rolls 109a and 109b that convey the print paper therebetween, and a discharge roll 11
0 and a guide plate 111 for sending out the printing paper. The pinch roll 109a rotates with the paper drum 102. The pinch roll 109b rotates together with the discharge roll 110. The printing paper sent from the guide plate 111 hits the collision plate 112 and overlaps on the discharge tray 113.

According to the conventional stencil printing apparatus configured as described above, the paper feed roll 106 and the timing roll 10
The printing paper taken out by 7 is held at its leading end by holding claws 103 of the paper cylinder 102, and is conveyed along the outer circumference of the paper cylinder 102 as the paper cylinder 102 rotates. At this time, the conveyance speed V _a of the printing paper becomes peripheral velocity V ₁ of the Kamido 102. Then, the printing paper is printed while being sandwiched between the plate cylinder 100 and the paper cylinder 102.

[0007] When the printing paper is held by the holding claw 103 and transported to the pinch roll 109a, the holding claw 103 is opened to release the holding of the printing paper. Thereafter, the printing paper is fed to the paper cylinder 102 by the pinch roll 109a and the paper discharge nail 108.
And is carried to the paper discharge roll 110. Conveying speed V _a of the printing paper transported by the paper discharge roller 110 and the pinch roll 109b, the printing paper is printing drum 100 and Kamido 1
02, the peripheral speed V of the paper cylinder 102 during printing.
It becomes ₁ . After printing is completed, the printing paper is transferred to the plate cylinder 100.
And the paper discharge roll 11
If sandwiched by 0 and pinch roll 109b and only the conveying speed V _a becomes peripheral velocity V ₂ of the sheet discharge roller 110. When the printing paper is sandwiched between the plate cylinder 100 and the paper cylinder 102 and between the pinch roll 109b and the discharge roll 110, the pinch roll 109b and the discharge roll 1
The pressure when sandwiched between the plate cylinder 100 and the plate cylinder 10
For weaker than the pressure when sandwiched 2, the conveying speed V _a becomes peripheral velocity V ₁ of the Kamido 102.

Although the peripheral speed V ₁ of the paper drum 102 and the peripheral speed V ₂ of the paper discharge roll 110 are substantially the same, the paper discharge roll 11 is used to prevent the conveyed printing paper from sagging or breaking.
Towards the 0 of the peripheral velocity V ₂ is slightly greater than the peripheral velocity V ₁ of the Kamido 102. If the difference between the peripheral velocities V ₁ and V ₂ is too large, the slip generated between the paper cylinder 102 and the printing paper will be large, and the image will be disturbed.

The printing paper sent from the paper discharge roll 110 hits the collision plate 112 and overlaps the paper discharge table 113.

[0010]

In THE INVENTION Problems to be Solved conventional stencil printing machine, for the reasons described above, the circumferential velocity V ₂ of the circumferential speed V ₁ and the sheet discharge roller 110 of Kamido 102 was set to be substantially equal. However, the guide plate 111 moves
The speed of the print paper (paper discharge speed V ₆ ) that jumps out toward
It is determined by the peripheral speed of the paper discharge roll 110. Paper cylinder 102
When the peripheral speeds of the discharge rollers 110 are set to be substantially equal to each other as described above, the peripheral speed of the discharge rollers 110 also decreases at the time of low-speed printing in which the peripheral speed of the paper cylinder 102 is small. Therefore, at the time of low-speed printing, the discharge speed of the printing paper is also reduced. If the discharge speed of the printing paper is insufficient, a paper jam may occur in the discharge roll 110.
If the paper discharge speed is sufficient, the discharged print paper hits the collision plate 112, falls onto the paper discharge table 113, and overlaps the lower print paper. However, if the paper discharge speed is insufficient, the printing paper does not reach the collision plate 112 and the paper
The printing paper falls onto the paper discharge tray 113 while rubbing the printing surface of the printing paper. As a result, the image on the printing paper may be stained by rubbing.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stencil printing apparatus capable of stably discharging a printing sheet onto a discharge tray.

[0012]

According to a first aspect of the present invention, there is provided a stencil printing apparatus for performing stencil printing on printing paper using a stencil sheet made of a stencil. A cylindrical printing drum (4) having a supply means 8) and having a stencil wrapped around its outer peripheral surface and rotating around its own central axis; and a cylindrical printing drum (4) provided in the vicinity of the printing drum. Between the opposing roll (paper cylinder 1), which conveys the printing paper therebetween, a pinch roll (11) provided near the opposing roll, and the pinch roll provided near the opposing roll. A discharge roll (14) for transporting the printed print paper across the print paper; and a transport roll provided near the discharge roll and transporting the print paper conveyed by the pinch roll and the discharge roll to a discharge tray. Transport mechanism (20) The has the plate cylinder and the counter roll of the peripheral velocity V _3, the peripheral speed of the paper discharge roll V ₄ for conveying the print sheet, the conveying speed of the conveying mechanism V
When ₅ is characterized in that it is configured so it holds Formula _{V 3 <V 4 <V 5} .

A stencil printing apparatus according to a second aspect is the stencil printing apparatus according to the first aspect, wherein the plate cylinder (4), the discharge roll (14), and the transport mechanism (2).
0) is driven by a common drive source.

According to a third aspect of the present invention, in the stencil printing apparatus according to the first aspect, the plate cylinder (4) and the paper discharge roll (14) are driven by a first drive source. The transport mechanism (20) is driven by the second drive source.

[0015] The stencil printing apparatus according to claim 4 is a contract printing apparatus.
2. The stencil printing machine according to claim 1, wherein the peripheral speed of the plate cylinder is
V_ThreeAnd the peripheral speed V of the discharge roll_FourAre set to the same ratio.
It can be arbitrarily selected from a set of multiple peripheral speeds
The transport speed V of the transport mechanism _FiveIs the plate cylinder and the
It can be set independently of the peripheral speed of the discharge roll.

According to a stencil printing apparatus according to a fifth aspect, in the stencil printing apparatus according to the first aspect, the peripheral speed V _{3 of the} plate cylinder, the peripheral speed V ₄ of the discharge roll, and the transport speed of the transport mechanism. V ₅ can be arbitrarily selected from the set of peripheral speed and the conveying speed of the plurality of stages that are set to a constant ratio.

In a stencil printing apparatus according to a sixth aspect of the present invention, in the stencil printing apparatus according to the first aspect, at least one pair of the pinch rolls (11) is in contact with a place other than an image portion on a printing surface of the printing paper. And the discharge roll (14) is in contact with the non-printing surface of the printing paper.

A stencil printing apparatus according to a seventh aspect of the present invention is the stencil printing apparatus according to the sixth aspect, wherein the speed of conveyance of the printing paper conveyed by the discharge roll (14) and the pinch roll (11). _Vb is the plate cylinder (4)
Wherein during printing the printing paper (9) is sandwiched by the opposing roller (Kamido 1) is identical to the V _3, wherein the said plate cylinder (4) and the opposing roll (Kamido 1) and during non-printing the printing paper (9) is not pinched is the V _5.

The stencil printing apparatus according to claim 8 is the stencil printing apparatus according to claim 1, wherein the transport mechanism (2)
0) is a belt (22) wound around a pulley (21)
And suction means (23) for holding the printing paper (9) on the belt.

[0020]

The conveying speed _Vb of the printing paper (9) being conveyed by the discharge roll (14) and the pinch roll (11) is the same as the plate cylinder (4) and the opposing roll (paper cylinder 1). wherein during printing the printing paper is sandwiched, it is identical to the V ₃ peripheral speed (peripheral speed or the counter roll) of the plate cylinder (4) by. At this time, the leading edge of the printing paper
Also be pulled by the conveying mechanism conveying speed V ₅ (20), the intermediate portion of the printing paper is sandwiched by the paper discharge roll and the pinch roll (11) (14), said plate cylinder (4 ) And the printing paper (9), no slip occurs, and no image disturbance occurs. When the printing paper is separated from the plate cylinder (4), the opposing roll (paper cylinder 1) and the plate discharge roll (14), the transport mechanism (2)
0) is conveyed at the conveying speed V ₅ by. Conveying speed V ₅ of the transport mechanism can be arbitrarily set independently of the printing speed. For this reason, the printed printing paper can be discharged at a sufficient discharge speed even at the time of low-speed printing.

[0021]

FIG. 1 shows an example of an embodiment of the present invention.
This will be described with reference to FIGS. A cylindrical paper cylinder 1 as an opposing roll is rotatable around a central axis 2. Paper cylinder 1
Is provided with a holding claw 3 for holding the leading edge of the printing paper. A concave portion 6 is formed on the outer peripheral surface of the paper cylinder 1 in order to avoid interference with a clamp device 5 of the plate cylinder 4 described later. A rotation speed detecting means 7 for detecting the rotation speed of the press drum 1 is provided on the central axis 2 of the press drum 1.

Around the cylinder 1, four cylindrical plate cylinders 4 are provided.
Is provided. The four plate cylinders 4 are arranged at predetermined angular intervals along the rotation direction of the paper cylinder 1. The outer diameter of these plate cylinders 4 is substantially the same as the outer diameter of the paper cylinder 1. The axis of the plate cylinder 4 is parallel to the axis of the cylinder 1. Each plate cylinder 4 is arranged at a position substantially in contact with the outer peripheral surface of the paper cylinder 1.

Each plate cylinder 4 is rotatable about its own axis. A part of the peripheral wall of the plate cylinder 4 is provided with an ink-permeable region. Inside the plate cylinder 4, an ink supply means 8 for supplying ink to the inner peripheral surface of the peripheral wall is provided.
A clamp device 5 for fixing the leading end of the stencil sheet is provided on the outer peripheral surface of the peripheral wall of the plate cylinder 4. The stencil sheet whose leading end is fixed by the clamp device 5 is wound around the outer peripheral surface of the plate cylinder 4.

The plate cylinder 4 and the paper cylinder 1 are rotationally driven synchronously by a common drive source. The rotation direction of each plate cylinder 4 and the rotation direction of the paper cylinder 1 are opposite. During rotation, the clamping device 5 of each plate cylinder 4 enters the recess 6 of the cylinder 1 and does not contact the outer peripheral surface of the cylinder 1. The rotational speed of the plate cylinder 4 and the press cylinder 1 determines the printing speed. The printing speed, that is, the rotation speed of the plate cylinder 4 and the press cylinder 1 can be arbitrarily selected and set from a plurality of predetermined stages. Here, for convenience of the following description, the cylinder 1
The peripheral speed and V _3.

The four plate cylinders 4 perform printing with inks of cyan, magenta, yellow, and black, respectively.
A stencil sheet made according to the color of the ink is wound around the outer peripheral surface of each plate cylinder 4. That is, the full-color original image is subjected to color separation into four color images. Then, four stencil sheets are made according to each color image. Each stencil sheet is mounted on each plate cylinder 4. The paper cylinder 1 holds the printing paper 9 with the holding claws 3 and conveys it along the outer peripheral surface. The printing paper 9 is successively sandwiched between the four printing drums 4 and the printing drum 1, and is printed by stencil paper of each color. As a result, a full-color image is formed on the printing paper 9.
Of course, multicolor printing is also possible.

As shown in FIG. 1, on the discharge side of the paper cylinder 1,
A paper ejection claw 10 is provided near the outer peripheral surface of the paper cylinder 1. The discharge nail 10 peels the printing paper 9 released from the holding nail 3 from the plate cylinder 4.

As shown in FIGS. 1 and 2, a pinch roll 11 is provided near the paper cylinder 1. The pinch roll 11 has two pairs of rolls that contact both edges of the printing paper 9 in the width direction. Since no image is printed on both edges of the printing paper 9, the pinch roll 11 does not contact the printed image. Specifically, the holding bodies 12 are respectively arranged near both ends in the axial direction of the paper cylinder 1. Rolls 13 are rotatably provided on each of the holding members 12 at two positions before and after along the transport direction of the printing paper 9.

As shown in FIGS. 1 and 2, below the pinch roll 11 on the front side in the transport direction of the printing paper 9,
A paper discharge roll 14 is provided. The length of the discharge roll 14 in the axial direction corresponds to the width of the printing paper 9. Paper discharge roll 1
Reference numeral 4 contacts the lower surface (non-printing surface) of the printing paper 9. The paper discharge roll 14 of this example is driven by the same drive source as the plate cylinder 4 and the paper cylinder 1.

Here, for the convenience of the following description, the discharge roll 1
The peripheral speed of No. ₄ is V ₄ . In this example, the peripheral speed V of the paper cylinder 1
₃ and the peripheral speed V ₄ of the discharge roll 14 are almost the same,
If the circumferential velocity V ₄ of the discharge roll 14 is slightly larger. Then, the peripheral velocity V ₃ of Kamido 1 and the circumferential velocity V ₄ of the discharge roll 14
Is kept constant. When the speed of the plate cylinder 4 and the speed of the paper cylinder 1 are switched to an arbitrary stage, the speed of the discharge roll 14 is changed accordingly so that the speed ratio is kept constant.

As shown in FIG. 1 and FIG.
4 is provided with a transport mechanism 20. The transport mechanism 20 is continuously operated during printing, and has a function of sending out the printing paper 9 transported by the pinch roll 11 and the paper discharge roll 14 to a paper discharge table described later at a speed required for smooth paper discharge. I have. The transport mechanism 20 of the present example has two belts 22 wrapped around a pulley 21 and suction means 23 provided below the belts. The suction means is the printing paper 9
On the belt. The transport mechanism 20 may be driven by the same drive source as the plate cylinder 4, the paper cylinder 1, and the discharge roll 14, or may be driven by a drive source separate from these.

Here, for convenience of the following description, the transport mechanism 20
The transport speed of the V _5. In this example, the conveying speed V ₅ of the transport mechanism 20 is greater than the circumferential velocity V ₄ of the discharge roll 14. Then, the speed ratio of the peripheral velocity V ₃ of the conveying speed V ₅ and Kamido first transport mechanism 20 is kept constant. Switching the speed of the plate cylinder 4 and Kamido 1 at any stage, the conveying speed V ₅ also the speed ratio of the transfer mechanism 20 is changed to be kept constant accordingly. Or plate cylinder 4 and paper cylinder 1
Regardless of the speed of, within a range satisfying V _5> V _4, it may be configured so as to be capable of arbitrarily setting the conveying speed V ₅ of the transport mechanism 20.

As shown in FIG. 1, a flying table 24 is provided at an end of the transport mechanism 20. The flying table 24 is uphill along the transport direction of the printing paper 9 and has a transport speed V
The flying of the printing paper 9 conveyed by ₅ is assisted.

As shown in FIG. 1, a paper discharge table 25 is provided next to the transport mechanism 20 in the flight direction of the printing paper 9. A collision plate 26 is provided at the rear of the paper discharge table 25, and the printing paper 9 flying from the flying table 24 collides with the collision plate 26. The printing paper 9 that has collided with the collision plate 26 falls and falls,
On top of.

As shown in FIG. 1, a paper feed table 27 is provided below the paper discharge table 25. On the paper feed table 27, a large number of printing papers 9 are stored in a pile. The paper feed roll 28 is in contact with the top printing paper 9. The printing paper 9 taken out by the paper feed roll 28 is sent along the guide surface 29, and sent between the paper cylinder 1 and the first plate cylinder 4 by the timing roll 30.

According to the stencil printing apparatus of the present embodiment configured as described above, the leading end of the printing paper 9 taken out by the paper feed roll 28 and the timing roll 30 is held by the holding claws 3 of the paper cylinder 1. . The printing paper 9 is conveyed along the outer circumference of the cylinder 1 as the cylinder 1 rotates. At this time, the conveyance speed V _b of the printing paper 9, the peripheral velocity V ₃ of Kamido 1.
Then, the printing paper 9 is sandwiched between the four printing drums 4 and the printing drum 1, and images of four colors are printed one after another.

Thereafter, the printing paper 9 is peeled off from the paper cylinder 1 by a pinch roll 11 and a paper discharge claw 10, and
It is carried to 4. The transport speed _Vb of the printing paper 9 transported by the discharge roll 14 and the pinch roll 11 is the peripheral speed V _{3 of the} paper cylinder 1 during printing in which the printing paper 9 is sandwiched between the plate cylinder 4 and the paper cylinder 1. Is the same as At this time, the leading end of the printing paper 9, also be pulled by the transport mechanism 20 of the conveying speed V _5, the intermediate portion of the printing paper 9 is pinched by the pinch rolls 11 and the paper discharge roll 14, plate cylinder 4 And the printing paper 9 is prevented from slipping. Therefore, no disturbance occurs in the image.

The end printing, when a state not sandwiched printing paper 9 by the plate cylinder 4 and Kamido 1, immediately printing paper 9 is conveyed at a velocity V ₅ by the transport mechanism 20. Then, the printing paper 9, jumped out flying platform 24 at a velocity V ₅ that is set to a sufficient value, overlies discharge tray 25 collides with the collision plate 26. Therefore, the printing paper 9 does not jam at the discharge roll 14 due to the insufficient transport speed of the transport mechanism 20. In addition, the image does not jump out at an insufficient speed and rub the image of the previous printing paper 9 on the paper output tray 25.

[0038] Thus, in this example, the conveying speed V ₅ of the transfer mechanism 20 can be arbitrarily set independently of the printing speed. For this reason, even at the time of low-speed printing, the printed print paper 9 can be discharged at a sufficient discharge speed.

FIG. 3 is a block diagram showing a control unit of the stencil printing apparatus of this embodiment. The printing speed is set by a printing speed setting key 50 provided on the operation panel of the stencil printing apparatus. The control circuit 51 controls the transmission 52 according to the set printing speed. The transmission 52 changes the driving speed of a driving source for driving the paper cylinder 1. The control circuit 51 includes a CPU and the like provided in the stencil printing apparatus.

An example of speed control by the transmission 52 will be described.
If the printing speed of the stencil printing machine is four steps, specifically, relatively low speeds of 60 [rpm] and 80 [rpm], and relatively high speeds of 100 [rpm] and 120 [rpm] can be used. it can.

In this embodiment, the transport speed of the transport mechanism 20 is higher than the printing speed of the stencil printing apparatus. When the printing speed of the stencil printing apparatus is relatively low, that is, when the peripheral speed V _{3 of the} paper cylinder 1 is low, the transport mechanism 20
The ratio of the conveyance speed V ₅ of is set larger. Conversely, when a large circumferential speed V ₃ of Kamido 1, the ratio of the conveying speed V ₅ of the transport mechanism 20 for this is set to be small. As an example of the ratio of these two speeds, if the printing speed is 1
In the case of less than 00 [rpm], 1.8 and 100 [rpm]
m], it is 1.2.

Thus, when the printing speed is low, the transport speed V ₅ of the transport mechanism 20 is increased at a slightly higher rate, so that the printing paper 9 can be transported at a speed reaching the collision plate 26 of the paper discharge tray 25. Thus, the printing paper 9 can be accurately aligned on the paper discharge tray 25. In addition, the printing paper 9 is
There is no risk of rubbing the upper surface of the printing paper 9 already stacked on the printing paper 5 and deteriorating the image.

[0043] Further, when the printing speed is high speed, since the conveying speed V ₅ of the transfer mechanism 20 is speeding at slightly lower ratio, the printing paper 9 without rebound against the impact plate 26, discharge the printing paper 9 It can be accurately aligned on the paper table 25.

FIG. 4 shows the control means of the drive source 53 of the transport mechanism 20 when the drive system of the paper cylinder 1 (or the plate cylinder 4) and the drive system of the transport mechanism 20 are separate in the stencil printing apparatus. Is shown. CPU (control circuit) 54 shown in FIG.
Is based on the processing program stored in the ROM 55,
The setting speed of the print speed setting key 50 (60 to
The speed ratios are switched to K1, K2, K3, and K4, respectively, according to the four steps up to 120 rpm, and the drive source (servo motor) 53 is directly driven via the motor drive circuit 56. That is, after selecting the speed ratio K1~K4 depending on the peripheral velocity V ₃ of the plate cylinder 4 which is set to calculate the conveying speed V ₅ of the transport mechanism 20.

As an example, if the rotation speed of the paper cylinder 1 is 60
[Rpm], the speed ratio K1 = 1.8, and 80 [rpm]
m], K2 = 1.7, 100 [rpm], K3 = 1.6, and 120 [rpm], K4 = 1.
5 is assumed. Here, when the peripheral speed of the cylinder 1 is low, the speed ratio is increased, and as the peripheral speed of the cylinder 1 increases, the speed ratio is decreased as in the above-described embodiment.

[0046] After determining the speed ratio, it calculates the conveying velocity V ₅ of the transfer mechanism 20 by using the speed ratio, to determine the driving speed of the driving source based on the calculation result. Incidentally, stores the conveying speed V ₅ of the transfer mechanism 20 corresponding to the speed ratio advance in RAM57, etc. to drive the driving source on the basis of this value.

As described above, the driving of the paper cylinder 1 (or the plate cylinder 4)
A transfer machine using a drive source 53 such as a servomotor separately from the system
By driving the structure 20, the paper cylinder 1 and the transport mechanism 20
The speed ratio is the peripheral speed V of the cylinder 1._ThreeCan be changed according to
it can. Rotation speed V of cylinder 1 _ThreeIs selected from multiple stages
The transfer speed V of the transfer mechanism 20_FiveCan be determined for each stage
The printing paper 9 can be discharged more stably.
become able to.

In the example described above, the peripheral speed of the paper cylinder 1
V_ThreeAnd the peripheral speed V of the discharge roll 14 _FourIs V_Three: V
_Four= 1: 1.06.

Although the stencil printing apparatus of the above-described example has the rigid printing cylinder 1 and the four printing cylinders 4, the structure for printing is not limited to this. For example, a stencil printing machine having one paper cylinder and one plate cylinder may be used. Further, a stencil printing machine having an opposing roll that can move up and down near the rotating plate cylinder may be used. In this apparatus, printing paper is supplied between the plate cylinder and the opposing roll, and the printing paper is pressed by pressing the printing paper against the rotating plate cylinder while the opposing roll rises. Further, a stencil printing machine having a plate cylinder having a deformable peripheral wall, a unit for supplying ink to the inside of the peripheral wall, and a pressing unit provided inside the peripheral wall to press the peripheral wall may be used. In this device, an opposing roller is provided at a predetermined position near the plate cylinder. In this apparatus, printing paper is supplied between the plate cylinder and the opposing roll, and the pressing means presses the peripheral wall of the plate cylinder to deform it outward, and printing is performed with the printing paper sandwiched between the opposing roll. .

In the stencil printing apparatus of the present embodiment described above, the transport mechanism 20 has a belt, but may be a transport mechanism using other transport means such as a roll.

In the stencil printing apparatus of the present invention, the drive source for the plate cylinder and the discharge roll and the drive source for the transport mechanism may be common or separate.

FIG. 5 shows a structure in which the plate cylinder 4, the paper discharge roll 14, and the transport mechanism 20 are driven by a main motor 60 which is a common drive source. The driving force of the main motor rotates the plate cylinder 4 and the paper cylinder 1 via gears A, B, C, and D. Further, this driving force is applied to gears D, E, F,
The discharge roll 14 is rotated via G and H. Further, the driving force drives the transport mechanism 20 via the gears H, I, and J.

FIG. 6 shows a structure in which the transport mechanism 20 is driven by a motor 70 as a second drive source. The plate cylinder and the discharge roll 14 (not shown) are driven by a first drive source (not shown).

[0054]

According to the stencil printing apparatus of the present invention, assuming that the peripheral speed of the plate cylinder for transporting the printing paper is V ₃ , the peripheral speed of the discharge roll is V ₄ , and the transport speed of the transport mechanism is V ₅ , the expression V ₃ <V
₄ <V ₅ is configured to hold. For this reason,
During printing, printing is performed without causing slippage on the plate cylinder by the transport mechanism, and immediately after printing is completed, the printing paper can be transported and discharged at a sufficient transport speed of the transport mechanism. Therefore, an effect is obtained that the printing paper can be stably discharged onto the discharge tray.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing the structure of a stencil printing apparatus according to the present invention.

FIG. 2 is a plan view of a transport mechanism in the stencil printing apparatus of the present invention.

FIG. 3 is a block diagram of control means in the stencil printing apparatus of the present invention.

FIG. 4 is a block diagram of another example of the control means in the stencil printing apparatus of the present invention.

FIG. 5 is a diagram illustrating an example of a drive mechanism in the stencil printing apparatus of the present invention, and illustrates a case where a drive source for a plate cylinder and a discharge roll and a drive source for a transport mechanism are common.

FIG. 6 is a diagram illustrating an example of a drive mechanism in the stencil printing apparatus according to the present invention, in which a drive source for a transport mechanism is provided separately from a drive source for a plate cylinder and a discharge roll.

FIG. 7 is a diagram schematically showing the structure of a conventional stencil printing apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paper cylinder as opposed roll 4 plate cylinder 8 ink supply means as ink supply mechanism 9 printing paper 11 pinch roll 13 roll of pinch roll 14 discharge roll 20 transport mechanism 21 pulley 22 belt 23 suction means 53 drive source

Claims (8)

[Claims] 1. A stencil printing apparatus for performing stencil printing on printing paper by using a stencil sheet made in a stencil, wherein the stencil sheet has an ink supply mechanism therein and the stencil sheet is wound around an outer peripheral surface of the stencil sheet. A cylindrical plate cylinder that rotates, a counter roll that is provided to face the plate cylinder, and conveys the printing paper between the plate cylinder and the pinch roll that is provided near the counter roll. A discharge roll provided in the vicinity of the opposing roll and configured to convey the printed printing paper with the pinch roll therebetween; and a discharge roll provided in the vicinity of the discharge roll, A transport mechanism for transporting the printing paper transported by a paper roll to a paper output table, wherein the peripheral speed of the opposing roll is V ₃ , the peripheral speed of the paper output roll is V ₄ , and the transport speed of the transport mechanism a When V ₅ Stencil printing apparatus characterized by being configured to Formula V ₃ <V ₄ <V ₅ holds. 2. The stencil printing apparatus according to claim 1, wherein said plate cylinder, said discharge roll, and said transport mechanism are driven by a common drive source. 3. The stencil printing apparatus according to claim 1, wherein the plate cylinder and the discharge roll are driven by a first drive source, and the transport mechanism is driven by a second drive source. 4. The peripheral speed of the plate cylinder and the peripheral speed of the discharge roll can be arbitrarily selected from a set of a plurality of peripheral speeds set at the same ratio. ,
2. The stencil printing apparatus according to claim 1, wherein the peripheral speed of the plate cylinder and the peripheral speed of the paper discharge roll can be set independently. 5. The peripheral speed of the plate cylinder, the peripheral speed of the discharge roll, and the transport speed of the transport mechanism can be arbitrarily selected from a set of a plurality of peripheral speeds and transport speeds set at a fixed ratio. The stencil printing apparatus according to claim 1, wherein 6. The pinch roll has at least a pair of rolls that contact a place other than an image portion on a print surface of the print paper, and the discharge roll contacts a non-print surface of the print paper. The stencil printing apparatus according to claim 1, wherein 7. The conveyance speed _Vb of the printing paper being conveyed by the discharge roll and the pinch roll is V during the printing in which the printing paper is sandwiched between the plate cylinder and the opposing roll. ₃ and are identical, the plate cylinder and the stencil printing machine according to claim 6 wherein said V ₅ by opposing roller in a non-printing not the printing paper is sandwiched. 8. The stencil printing apparatus according to claim 1, wherein the transport mechanism has a belt wrapped around a pulley and suction means for holding the printing paper on the belt.