JP2001130122A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively stop a delivered printed printing sheet at a predetermined position without delivery jamming state even in the case of printing the sheet of various different sizes, rapid printing or normal printing. SOLUTION: In the stencil printer, a delivered printed printing sheet can be effectively stopped at a predetermined position on a delivery base 4 by controlling the operating speed of a belt conveying mechanism 5 corresponding to the sheet size of the sheet 2 so that the final conveying speed, that is, the delivering speed of the sheet 2 accelerated or decelerated by the mechanism 5 becomes the effective delivering speed capable of stopping the sheet 2 at the predetermined position in association with the linear speed of the sheet 2 fed by the rotation of a plate cylinder 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing apparatus, and more particularly, to a stencil printing machine having a function of printing a printing sheet by stencil printing and discharging the printed printing sheet to a sheet discharge table or the like. Related to the device.

[0002]

2. Description of the Related Art In a conventional stencil printing machine having a plate cylinder which is rotated so that a stencil sheet made on a stencil is subjected to printing and prints on printing paper, a stencil printing machine generally includes a stencil sheet and a pressing means facing the same. Printing is performed on the printing paper while transporting the printing paper, and the printed printing paper is transported to a paper output port by a transport mechanism such as, for example, a belt transport device, and is referred to as a paper output table or a paper output tray. Discharge tray (hereinafter referred to as a discharge tray).

[0003] In such a stencil printing apparatus, generally, before starting a normal printing process, in order to surely make a stencil sheet made on a plate cylinder without causing wrinkles or breakage of the stencil sheet. By rotating the plate cylinder at a speed lower than that of the normal printing process, the stencil sheet is wound around the plate cylinder, and the printing paper is fed in, thereby performing a process called a so-called first print or printing operation. According to such a process, the stencil sheet can be reliably applied to the plate, and the pressing means and the like can be prevented from being stained with ink from the plate cylinder. The printing paper printed by the first print in this way is
The sheet is conveyed by the conveyance mechanism and discharged from the sheet discharge port toward the sheet discharge table.

[0004] After the stencil sheet is set on the plate cylinder in this manner, a normal printing process is performed on the printing paper. In this case, in order to increase the printing throughput, the printing process is generally performed more than in the first printing. The plate cylinder is rotated at a high rotation speed. In such a case, in general, the operating speed of the transport mechanism (for example, in the case of a belt transport mechanism, the linear velocity at which the upper surface of the belt moves) increases in conjunction with the plate cylinder, and as a result, the printed paper discharged at that time is discharged. The discharge speed of the printing paper is also increased.

In the above-described first printing process, when the transport speed of the printing paper by the transport mechanism in conjunction with the plate cylinder rotating at a speed lower than usual is reduced, the printing paper is discharged toward the paper discharge table. Also, the discharge speed of the printed printing paper becomes slow, and the printing paper may not be able to reach the discharge tray in a predetermined state and may stop halfway, and the printing paper stopped in the middle becomes an obstacle, Thereafter, the printing paper printed and discharged in the normal printing process may cause a paper discharge jam state.

Therefore, in order to solve such inconvenience, a technique for increasing the speed at which the printed printing paper is conveyed after the first printing process is completed has been proposed, for example, in Japanese Patent No. 26779896. In addition, a technique has been proposed in which the printing paper is discharged at a speed (linear speed) higher than the transport speed (linear speed) of the printing paper on the plate cylinder in the first print process. Such a technique, even if the plate cylinder is rotated at a slower speed in the first printing process than in the normal printing process,
By increasing the speed at which printed printing paper is discharged, such as by increasing the conveyance speed of the paper discharging means, the printing paper discharged during the first print may be caused by insufficient discharge speed. To prevent stopping on the way,
It is intended to make it possible to eliminate the occurrence of a subsequent paper discharge jam state.

In general, in a conventional stencil printing apparatus, the plate cylinder and the transport mechanism are often driven in conjunction with one driving force source. In such a case, for example, during normal printing, When the rotation speed is increased, the transport speed (operating speed) of the transport mechanism also increases in conjunction with it, so by increasing the speed of the plate cylinder and the transport mechanism as a whole, such as during the first print, etc. In many cases, the inconvenience that the printing paper stops between the discharge port and the predetermined position can be avoided.

However, if the printing speed is increased in the normal stencil printing process, the final printing paper discharge speed also becomes too high, causing the printing paper to fly too vigorously, causing paper jams. Conversely, if the printing speed is reduced, the final printing paper discharge speed will be insufficient, and the printing paper to be discharged will stop halfway as in the case of the first print described above. When the printed printing paper is discharged, it may cause a paper discharge jam. In addition, when the printing paper is stopped halfway, if the user manually performs paper alignment from outside, the ink attached to the printing paper already placed on the paper output tray further increases the ink. In some cases, there is a problem of so-called set-off, that is, the toner adheres to the back side of another printing paper placed thereon.

Therefore, in order to solve such a problem caused by the phenomenon that the printing paper discharged at the time of printing stops halfway, the plate cylinder and the belt transport mechanism are driven by a single driving force source such as a pulley, a gear, or the like. When the printing speed is low, the linear velocity of the surface of the belt transport mechanism with respect to the linear velocity of the outer peripheral surface of the plate cylinder is changed when the printing speed is low. The ratio (hereinafter referred to as the linear velocity ratio) is increased, and when the printing speed is high, the linear velocity ratio of the surface of the belt transport mechanism to the linear velocity of the outer peripheral surface of the plate cylinder is reduced, or such a linear velocity ratio is variable. For example, Japanese Patent Laid-Open No. 8-67387 proposes a technique in which the plate cylinder and the belt transport mechanism are separately driven by separate motors. In this method, when the rotation speed of the plate cylinder is low, the linear velocity ratio of the belt transport mechanism, that is, the linear velocity of the upper surface of the belt transport mechanism (the surface on which the printing paper is placed and transported) with respect to the linear velocity of the rotation of the plate cylinder Is set to k = 1.
8, and when the rotation speed of the plate cylinder is high, the linear velocity ratio k of the belt transport mechanism is set lower than the above-mentioned k = 1.8, for example, k = 1.2. , The conveying speed of the printing paper by the belt conveying mechanism is adjusted. By changing the linear velocity ratio in this way, it is possible to stably discharge the print sheet without causing a discharge jam.

Further, if the rotation speed of the plate cylinder is increased while printing is being performed on the printing paper by the plate cylinder, problems such as an imbalance in the density of the printing paper and wrinkling of the stencil sheet may be caused. Therefore, the rear end position of the printing paper in the transport direction is detected, the timing at which the printing paper separates from the plate cylinder is grasped based on the position, and the rotation speed of the plate cylinder is increased in accordance with the separation timing. Various techniques have been proposed.

[0011]

However, even if the rotation speed of the plate cylinder or the transport speed of the transport mechanism is changed by the above-described technique, if the size of the printing paper is different, the printing paper is moved toward the discharge tray. The position and the state where the discharged printed printing paper finally stops on the paper discharge table are remarkably different, which causes a problem that a paper discharge jam occurs. Here, even if the rotation speed of the plate cylinder and the transport speed by the transport mechanism are set so as not to cause a paper discharge jam using the above-described technology, for example, a large format such as A3 size and a B5 size In the case of a small format as described above, the position where the discharged printed printing paper finally stops is significantly different.

For example, even if the rotation speed of the plate cylinder and the transport speed by the transport mechanism (operating speed of the transport mechanism) are set to a speed suitable for discharging printing paper of a small paper size such as A5 size. , With the same settings, for example A
When a large print sheet such as a 3 size sheet is discharged, the final discharge speed of the print sheet becomes insufficient to reach a predetermined position on a discharge tray or the like. In some cases, the printing paper may stop halfway. Conversely, even if the setting is suitable for discharging print paper of a size such as A3 size, if a smaller print paper such as B4 size is discharged, In many cases, the ejection speed is too high, and the printing paper that hits a stopper generally called a collision wall arranged on the paper ejection tray is stopped by being bent or bent, and as a result, There is a case where a paper discharge jam occurs with the print paper that has been discharged. Also, there is a case where the discharged printing paper strongly hits the stopper and rebounds too much, stops at a position shifted from a predetermined position, and it is extremely necessary to manually realign the paper later. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. Even when a stencil printing apparatus performs printing on printing paper of various different paper sizes,
In addition, at the time of the first print or the normal printing, the printed printing paper to be discharged is accurately stopped (placed) at a predetermined discharge position or the placement position without causing a paper discharge jam state. Is to accomplish that.

[0014]

SUMMARY OF THE INVENTION A stencil printing apparatus according to the present invention comprises a plate cylinder on which a stencil sheet is wound and prints on a printing sheet while rotating (while the printing sheet is fed); In a stencil printing apparatus having a paper discharging means for discharging, a discharge speed of the printing paper discharged from the paper discharging means is controlled in accordance with a specification of the printing paper.

That is, the exact discharge speed at which the printing paper can be finally stopped at a predetermined position on the paper discharge table differs depending on the specifications such as the paper size and weight of the printing paper. . Therefore, the stencil printing apparatus according to the present invention discharges the printing paper at an appropriate discharge speed so that the printing paper can finally be stopped at a predetermined position of the paper discharge receiving portion in accordance with the specifications of the printing paper.

The paper discharging means here means a mechanism for discharging the printing paper, and more specifically, a mechanism for finally discharging the printing paper by urging it at the paper discharging port. It may be a paper discharge mechanism, or a paper discharge mechanism that conveys printed printing paper to a paper discharge port and performs further discharge. Alternatively, a paper discharge mechanism using a mechanism for transporting printed printing paper to the paper discharge port and a mechanism for urging the print paper from the paper discharge port to discharge the print paper may be used.

A stencil printing apparatus according to the present invention comprises a plate cylinder on which a stencil sheet is wound and prints on a printing sheet while rotating, and a sheet discharge for conveying the printing sheet and discharging the sheet toward a discharge receiving portion. A stencil printing device having a paper specification detecting means for detecting the specification of the printing paper, and controlling the transport speed of the paper discharging means based on the detected specification of the printing paper. Discharging speed control means for controlling the discharging speed of the printing paper discharged from the paper means.

That is, the specification of the printing paper is detected by the paper specification detecting means, and the conveying speed of the printing paper by the paper discharging means is controlled based on the detected specification, so that the printing paper is adjusted to the paper size. The discharge is performed at an appropriate discharge speed such that the discharge can be finally stopped at a predetermined position.

The paper discharge receiving section is, for example, a paper discharge table or a paper discharge tray, and is a flat paper receiving tray on which printed printing paper discharged from a paper discharge port is placed. Means one with a part. In that sense, let alone the paper ejection tray and paper ejection tray originally provided in the stencil printing apparatus, besides, for example, a paper ejection board that is attached or replaced as a so-called retrofit to the stencil printing apparatus main body, Needless to say, the sheet discharge tray of the sorter to be attached to the stencil printing apparatus body later is also included in what is referred to as a sheet discharge receiving section here. Further, in a printing apparatus or a copying apparatus such as a so-called stencil printing apparatus or a copying machine, an apparatus provided with a collision wall such as a stopper is often used. Is suitable as a paper discharge receiving section. However, the present invention is not limited to this, and it is needless to say that an impact wall may be provided so as to surround the periphery of three sides other than one surface in the vicinity of the paper discharge port, or a tray-shaped one may be used.

The speed at which the printing paper is conveyed by the paper discharging means does not always coincide with the operating speed of the mechanism of the paper discharging means. In other words, when, for example, a belt transport mechanism is employed as the sheet discharging means, the printing paper fed from the plate cylinder may move while sliding on the surface of the belt. The linear velocity of the front surface) and the transport speed of the printing paper transported thereover may not always coincide. Therefore, after taking into account such a slippage phenomenon of the printing paper at the time of conveyance, the paper discharging means is controlled so as to obtain an accurate discharging speed capable of stopping the printing paper at a predetermined position. It is desirable.

A stencil printing apparatus according to the present invention comprises a plate cylinder on which a stencil sheet is wound and prints on a printing sheet while rotating, and a paper discharge for conveying the printing paper and discharging the paper toward a discharge receiving portion. In the stencil printing apparatus having means, paper specification detecting means for detecting the specification of the printing paper, and, based on the detected specification of the printing paper, the rotation speed of the plate cylinder, the conveyance speed of the paper discharging means, And a discharge speed control means for controlling a discharge speed of the printing paper discharged from the paper discharge means.

That is, the specification of the printing paper is detected by the paper specification detecting means, and based on the detected specification,
In addition to controlling the rotation speed of the plate cylinder when printing on the printing paper, the printed printing paper finally discharged in conjunction with the rotation speed of the plate cylinder at that time finally stops at a predetermined position. This is to control the transport speed of the printing paper by the paper discharging means so as to achieve an accurate discharging speed.

A stencil printing machine having a plate cylinder on which a stencil sheet is wound and prints on a printing sheet while rotating, and a sheet discharging means for conveying the printing sheet and discharging the sheet toward a discharge receiving portion. An apparatus configured to detect a specification of the printing paper; and a control unit configured to control a conveyance speed of the paper discharging unit based on a rotation speed of the plate cylinder and a specification of the printing paper. Discharging speed control means for controlling a discharging speed of the printing paper discharged from the means.

That is, based on the specification of the printing paper detected by the paper specification detecting means and the rotational speed of the plate cylinder at that time, the printed printing paper finally discharged in combination with the rotational speed of the plate cylinder Is controlled so that the printing paper is conveyed by the paper discharging means so that the printing paper can be accurately stopped at a predetermined position.

Here, it is desirable that the above-mentioned specification is at least one of the paper size or outer dimensions of the printing paper and the weight per sheet.

That is, in order to properly stop the printing paper at a predetermined position in any of the various types of specifications, the final discharging speed at the time of discharging the printing paper is determined by the specification. The information particularly necessary (to be detected) for controlling the discharge speed is at least one of the paper size or the outer dimensions and the weight of the printing paper. Among them, it is first desirable to detect the paper size. Generally, so-called plain paper is often used as printing paper, and the paper size is, for example, B5 to A.
The outer dimensions differ more than twice between the largest and smallest ones, such as up to 2, and variations among them are A2, A3, A4, B3, B4, B5,. Different paper sizes are available. If the paper sizes are different in such a manner, the weight of the printing paper will be correspondingly different, and the area receiving the air resistance when the printing paper is discharged will also be different. The final stop position and the state after the discharge is changed become a factor. Alternatively, the sheet may stop or jump too much on the way to cause a paper discharge jam. On the other hand, the thickness of plain paper, which is generally used as printing paper, is almost standardized to 64 grams per square meter in an example of A4 size. ,
The weight will vary mainly depending on the paper size. As described above, in the case of the standard printing paper, the weight is often determined according to the paper size.

However, in addition to such plain paper, there is also a printing paper (printing target) of a special specification such as a postcard or a message card. In addition, since they have various sizes and thicknesses of paper, the weight is not always determined depending on the paper size. Therefore, in such a case, it is desirable to detect the weight of the printing paper. Alternatively, the specification including the outer dimensions and the material may be detected.

As described above, in order to stop the discharged printing paper at a predetermined position, it is necessary to discharge the printing paper at an accurate discharging speed corresponding to the specification such as the paper size and weight of the printing paper. Therefore, the specifications such as the paper size and weight of the printing paper, which are important factors for controlling the discharge speed, are detected. It should be noted that the type of specification that is desirably detected may be only the paper size or only the weight. Alternatively, both the paper size and the weight may be used. Alternatively, the material and thickness of the printing paper may be detected.

Further, the discharge speed control means may control the discharge speed so that the printing paper stops within a predetermined area of the discharge receiving portion.

That is, the transport speed of the printing paper by the paper discharging means is controlled such that the discharged printing paper finally reaches an appropriate discharging speed to stop within a predetermined area of the paper receiving unit. It is also preferred.

Further, the rotation speed of the plate cylinder and the transport speed of the paper discharging means may be controlled independently of each other.

In addition, the provision of a motor for driving the plate cylinder and a motor for driving the paper discharge means is simple and practical in the stencil printing apparatus according to the present invention. It is a typical aspect.

That is, in order to control the rotation speed of the plate cylinder and the conveying speed of the sheet discharging means to be respectively accurate, the motor for driving the plate cylinder and the sheet discharging means are required. It is desirable that the driving motor and the motor are separately provided, since the rotation speed of the plate cylinder and the conveyance speed of the sheet discharging means can be controlled independently of each other.

[0034]

According to the present invention, in the stencil printing apparatus, the paper size of the printing paper is changed by controlling the discharging speed of the printing paper discharged from the paper discharging means in accordance with the specification of the printing paper. Even if it is the case, or in the case of first print or normal printing, the printed printing paper to be ejected is moved to a predetermined position (or placement position, hereinafter the same) without causing a paper ejection jam condition. It can be stopped accurately.

Further, the specification of the printing paper is detected by the paper specification detecting means, and the printing paper is discharged at an accurate discharge speed such that the printing paper can be properly stopped at a predetermined position in accordance with the detected specification. Therefore, regardless of the paper size of the printing paper, and in both the first printing and the normal printing, the printed printing paper to be discharged is finally discharged without causing a paper output jam. It can be stopped exactly at a predetermined position on the paper receiving section.

Further, by controlling the rotation speed of the plate cylinder and the conveyance speed of the sheet discharging means based on the detected specification of the printing paper, the printing paper can be printed at an accurate rotation speed. By rotating the plate cylinder and, in combination with the rotation speed of the plate cylinder at that time, the printed printing paper finally discharged can be discharged at an accurate discharge speed, and as a result, the discharged printing paper is finally discharged. It can be accurately stopped at a predetermined position.

Further, by controlling the conveying speed of the paper discharging means based on the rotation speed of the plate cylinder and the specification of the detected printing paper, the discharging speed of the printing paper discharged from the paper discharging means can be adjusted to a predetermined value. The discharge speed can be set to be accurate so that the print paper can be stopped at the position, and as a result, the discharged printing paper can be finally stopped at a predetermined position accurately.

Further, as the above specification, by detecting at least one of the external dimensions of the printing paper and the weight per sheet, which are important factors for determining an accurate discharge speed, the division is performed based on the detection. The printing paper can be discharged at the outputted accurate discharge speed, and as a result, the printing paper can be finally stopped accurately at a predetermined position.

Further, by controlling the transport speed for transporting the printing paper so as to obtain a final discharging speed at which the printing paper can be stopped within a predetermined area of the paper receiving portion, The discharged printing paper can be finally stopped at a predetermined position accurately.

Further, by completely independently controlling the rotation speed of the plate cylinder and the transport speed of the sheet discharging means, each of them can be individually operated at an appropriate speed and transport force or torque. it can.

Further, by providing a motor for driving the plate cylinder and a motor for driving the paper discharge means separately, the rotational speed of the plate cylinder and the transport speed by the paper discharge means can be adjusted to the proper speeds. Independently controlling both mechanically and temporally (operational timing) so that
It can be achieved simply and practically.

[0042]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a diagram showing a schematic configuration of a stencil printing apparatus according to the present embodiment. The stencil printing apparatus transports the printing paper 2 while the stencil paper 1 is wound and rotated, and conveys the printing paper 2 fed from the printing drum 2 while carrying the printing paper 2 while conveying the printing paper 2 while rotating. A belt transport mechanism (paper discharging means) 5 for discharging the paper toward a paper discharging table (paper discharging receiving section) 4, a paper specification detecting section (paper specification detecting means) 6 for detecting the specification of the printing paper 2, Printing paper 2
By controlling the transport speed of the belt transport mechanism 5 based on the specifications of (1), the discharge speed control unit (discharge speed control means) 7 for controlling the discharge speed of the printing paper 2 discharged toward the discharge tray 4 is controlled. And a control unit 8 including the main unit.

Further, based on an unperforated stencil sheet 1 called a roll master held in a roll shape, an original reading section 9 for reading an original for printing (not shown), and an image of the read original, A thermal head 10 for performing thermal perforation on the unperforated stencil sheet 1 fed out,
When the stencil sheet 1 on which heat-perforation has been perforated is placed on the plate cylinder 3 in a predetermined state, the platen roller 11 for pressing out the stencil sheet 1 between the thermal head 10 and the platen roller 11 is rolled. A cutter mechanism 12 for separating from the unperforated stencil sheet 1 side, a press roller 13 for applying printing while pressing and pressing the printing paper 2 between the plate cylinder 3, and a user's manual input or the like. A mode setting unit 16 for inputting a print mode setting, a paper feed tray 14 on which unprinted print paper 2 is placed, and feeding of unprinted print paper 2 from the paper feed tray 14 to the plate cylinder 3 Feeding mechanism 15a,
15b, and a discharge tray 4 on which the discharged printed printing paper 2 is placed. In addition, the above-described control unit 8
Controls the operations of the thermal head 10, the platen roller 11, the cutter mechanism 12, the press roller 13, the plate cylinder 3, and the like.

First, the user manually inputs information on a print mode to be performed to the mode setting unit 16. The information on the print mode is, for example, information on the settings or specifications of a printed material to be printed by the user, such as the paper size, the color of ink used for printing, the number of copies, the enlargement / reduction ratio of the document, and the print density. . Therefore, the print mode information input to the mode setting unit 16 at this time generally includes paper size information in many cases. Therefore, the paper specification detecting unit 6 first extracts paper size information from the information input at this time, and detects this as the specification (information of) the printing paper 2. When other general operations in the mode setting unit 16, for example, the setting of the print density are input by the user via the interface, the control unit 8 controls the press roller 13 and the plate cylinder 3 based on the input. Operations similar to those of a general stencil printing apparatus, such as controlling a pressing force and an ink supply amount during the printing, will not be described in general in order to simplify the description.

The document reading section 9 optically reads an image of a document (not shown) placed on the document table by the image sensor 17. At this time, the range of the area where the image sensor 17 reads is determined by the mode setting unit 16 described above.
It is needless to say that the control is performed in the same manner as a general stencil printing apparatus based on the information of the paper size input to the printer. The image information of the document optically read by the image sensor 17 is once transmitted as an electric signal to the image data processing section 18 in the control section 8 and subjected to predetermined signal processing and the like, and then the thermal head 10 is driven. Is transmitted to the thermal head 10 as image data to be performed.

When the unperforated stencil sheet 1 is fed out, the thermal head 10 performs thermal perforation on the basis of image data obtained corresponding to the above-mentioned original. When the heat-sensitive perforation corresponding to the one original is completed, the cutter mechanism 12 is operated, and the perforated portion of the stencil sheet 1 that has been unwound from the roll and remains in a band shape is a sheet (one sheet). A portion corresponding to the rear end is cut so as to be in a state.

The stencil sheet 1 for which so-called stencil making has been completed as one stencil sheet 1 is clamped at the leading end in the transport direction and wound around the outer periphery of the plate cylinder 3. On the other hand, the unprinted printing paper 2 is fed from the paper feed table 14 to the paper feed mechanisms 15a and 15a.
b to the plate cylinder 3. From this point,
The so-called first print is substantially started. At this time, the rotational speed of the plate cylinder 3 and the operation speed of the belt transport mechanism 5 have already been adjusted to the specifications of the printing paper 2 (that is, the paper size, hereafter the same). Is controlled to the operating speed determined in accordance with. That is, for example, the rotation speed mode of the plate cylinder 3 at the time of the first print is previously determined to be a rotation speed of the plate cylinder 3 suitable for the first print by the original setting of the apparatus or manual input by the user.
Further, the operation speed of the belt transport mechanism 5 (that is, the belt surface) is adjusted so that the printing paper 2 finally discharged can be stopped at a predetermined position accurately in combination with the rotation speed of the plate cylinder 3. Linear velocity) is determined. In addition, the operating speed of the belt transport mechanism 5 is such that even if the specifications of the discharged printing paper 2 are variously changed, the discharged printing paper 2 is finally located at an appropriate position on the paper output table 4. In order to obtain a discharge speed at which the printing paper stops, the printing paper 2
Is determined in accordance with the specification. In this way, the printing paper 2 is supplied to the plate cylinder 3 and the belt transport mechanism 5 in a state where the rotation speed and the operation speed are controlled, respectively.
First print is executed. Then, the printed printing paper 2 is discharged from the belt transport mechanism 5 toward the paper discharge table 4 at the above-described discharge speed. The steps from printing on the printing paper 2 at the time of such first printing to finally stopping at the paper discharge table 4 via conveyance and paper discharge will be described with reference to FIGS.

FIG. 2 is a diagram schematically showing a schematic configuration of a plate cylinder 3, a belt transport mechanism 5, and a paper discharge table 4 of the stencil printing apparatus. FIG. FIGS. 4A and 4B are flowcharts showing the outline of the operation of the stencil printing apparatus when performing the first print including the above.

As described above, when the print mode information is input to the mode setting section 16 (S1), the paper specification detecting section 6 provided in the control section 8 controls the input of the print mode information. From among them, the input of the paper size information is detected and extracted (S2).

Based on the information on the paper size, the discharge speed control unit 7 controls the operation speed of the belt transport mechanism 5 so as to be a predetermined optimum speed. More specifically, in combination with the linear velocity of the printing paper 2 fed by the rotation of the plate cylinder 3, the printed printing paper 2 finally discharged from the belt transport mechanism 5 can be accurately stopped at a predetermined position. The operation speed of the belt transport mechanism 5 is controlled so that the discharge speed can be obtained.

Here, in the first embodiment, the rotation speed of the plate cylinder 3 can be set by selecting one of two modes, a low speed mode (20 rpm) and a high speed mode (40 rpm). It has become. Regarding the selection of the rotation speed mode of the plate cylinder 3, for example, the user may manually input an instruction to select one of the modes to the mode setting unit 16, or the control unit 8 etc. It goes without saying that an optimum combination of the determined paper size and the rotation speed of the plate cylinder 3 (at the time of first printing) may be automatically selected based on the paper size at that time. . In any case, by the time the unprinted printing paper 2 is supplied and the first printing is started, the plate cylinder 3
Has already been set, and the motor 2 for driving the plate cylinder so that the plate cylinder 3 rotates at the set speed.
0 is controlled.

On the other hand, the discharge speed control unit 7 controls the rotation speed of the plate cylinder 3 in the first print to be in the low speed mode (20r).
pm) or the high-speed mode (40 rpm), and controls the operation speed of the belt transport mechanism 5 in consideration of the information on the rotation speed of the plate cylinder 3 and the information on the paper size. The control is directly performed on the motor 21 for driving the belt.

That is, as shown in FIGS. 4 and 5,
If the rotational speed of the plate cylinder 3 is 20 rpm (low speed mode) (L and S4 in S3) and it is detected that the sheet size is B4 size or larger (Y in S5), the belt transport mechanism 5 Is controlled to 60 rpm in terms of rotation speed based on the rotation speed of the plate cylinder 3 (S6). Alternatively, when it is detected that the sheet size is smaller than the B4 size (N in S5), the operation speed of the belt transport mechanism 5 is converted to a rotation speed of 40 based on the rotation speed of the plate cylinder 3.
rpm (S7). As described above, when the rotation speed of the plate cylinder 3 is low, the operation speed of the belt conveyance mechanism 5 is increased when the paper size is large, such as B4 size, and when the paper size is small, less than B4 size, the belt conveyance speed is increased. The operation speed of the mechanism 5 is set to the same speed as the rotation speed of the low-speed plate cylinder 3.

If the rotation speed of the plate cylinder 3 is 40 rpm (high-speed mode) (H in S3 and S8) and it is detected that the paper size is B4 or more, the process proceeds to (S3).
9) Y, the operation speed of the belt transport mechanism 5 is controlled to 40 rpm in terms of rotation speed based on the rotation speed of the plate cylinder 3 (S10). Alternatively, when it is detected that the paper size is smaller than B4, the operation speed of the belt transport mechanism 5 is converted to a rotation speed based on the rotation speed of the plate cylinder 3 by 30.
rpm (S11). As described above, when the rotation speed of the plate cylinder 3 is medium speed, if the sheet size is as large as B4 size or more, the operation speed of the belt transport mechanism 5 is set to the same speed as the rotation speed of the medium speed plate cylinder 3, If the size is smaller than B4 size, the operation speed of the belt transport mechanism 5 is rather reduced to the plate cylinder 3.
The speed is lower than the linear speed of the printing paper 2 fed from the printer.

In this way, even when the size of the printing paper 2 is remarkably different, such as B3 size and B5 size, or when the plate cylinder 3 is rotating at a low speed during the first printing, high speed printing is possible. , The printing paper 2 can be finally discharged at a suitable discharge speed suitable for the paper size, and as a result, the discharged printing paper 2
Can be accurately stopped at a predetermined position on the sheet discharge table 4 without causing an inconvenience such as a sheet discharge jam.

Here, in the stencil printing apparatus of the present embodiment (that is, the same applies to the following second and third embodiments)
The plate cylinder 3 having a diameter of φ = 0.18 [m] is used. Therefore, the rotation speed of the plate cylinder 3 and the belt transport mechanism 5
The rotational speed conversion amount of the operating speed of (the angular speed ω [rp
m]) into a so-called linear velocity v [m / s], it goes without saying that a calculation expressed as v = πφω / 60 = 0.003πω may be performed.

In the present embodiment, the rotation speed of the plate cylinder in the high-speed mode at the time of first printing is set to 40 r.
The rotation speed in this high-speed mode should be set to a higher rotation speed within a range that does not cause wrinkles or breakage when the stencil sheet is applied to the plate cylinder. Needless to say, this is desirable.

(Embodiment 2) In this second embodiment, a case where normal printing is performed in a stencil printing apparatus according to the present invention will be described. In order to simplify the description, in the following description, the same parts as those in the first embodiment are denoted by the same reference numerals. FIG. 6 is a diagram showing a combination of the rotation speed of the plate cylinder 3 and the operation speed of the belt transport mechanism 5, and FIG. 7 is a flowchart showing main operations during normal printing in the stencil printing apparatus according to the second embodiment. is there.

For example, when normal printing such as 50 sheets / 1 original (lot) is started, generally, the specifications of the printing paper 2 including the paper size of the printing paper 2 used at that time are already set in the mode setting unit 16. Has been entered. Then, when the information of the print mode is input (S701), the paper specification detecting section 6 detects it and extracts the information of the paper size from the input information (S702).

Based on the information on the paper size, the discharge speed control unit 7 controls the operation speed of the belt transport mechanism 5 so as to be a predetermined optimum speed. More specifically, the final transport speed of the printing paper 2 accelerated or decelerated by the belt transport mechanism 5, that is, the discharge speed, in combination with the linear velocity of the printing paper 2 fed by the rotation of the plate cylinder 3, The operation speed of the belt transport mechanism 5 is controlled in accordance with the paper size of the printing paper 2 so that the discharge speed can be accurately stopped so that the printing paper 2 can be stopped at a predetermined position.

Here, in the stencil printing apparatus of the second embodiment, the rotation speed of the plate cylinder 3 for printing at a normal speed is set to a medium speed mode (60 rpm), and The rotation speed of the body 3 is set to the high speed mode (120 rpm
m) is set so that the user can select one of these two modes. Needless to say, the user can manually input the mode setting unit 16 to the mode setting unit 16 in the same manner as in the first embodiment. The setting of the rotation speed mode of the plate cylinder 3 is constant during the period in which the normal printing is performed, and at the time of the start of the printing, the speed setting suitable for the paper size has already been determined. When the printing paper 2 is supplied to the plate cylinder 3, the plate cylinder 3 and the belt transport mechanism 5 operate at a constant speed according to the speed setting, similarly to the case of the first embodiment. .

As shown in FIG. 6, the discharge speed control unit 7 determines that the rotation speed of the plate cylinder 3 is 60 rpm (medium speed mode) (L in S703 and S704), and that the paper size is B4 size or larger. If it is detected that there is (S70
5), the operation speed of the belt transport mechanism 5 is controlled to 110 rpm in terms of rotation speed based on the rotation speed of the plate cylinder 3 (S706). Alternatively, when it is detected that the sheet size is smaller than B4 size (N in S705), the operation speed of the belt transport mechanism 5 is controlled to 90 rpm in terms of the rotation speed based on the rotation speed of the plate cylinder 3. (S70
7). As described above, when the rotation speed of the plate cylinder 3 is the medium speed mode during normal printing, and the paper size is B4 size or larger, the operation speed of the belt transport mechanism 5 is set to be lower than the rotation speed of the plate cylinder 3. The operating speed of the belt transport mechanism 5 is increased even when the paper size is smaller than B4 size, and the operation speed of the belt transport mechanism 5 is not so high as when the paper size is large.

The rotation speed of the plate cylinder 3 is 120 rpm.
(High speed mode) (H in S703 and S70
8) If it is detected that the paper size is equal to or larger than the B4 size (Y in S709), the operation speed of the belt transport mechanism 5 is set to 80 rpm in terms of the rotation speed based on the rotation speed of the plate cylinder 3. (S710). Alternatively, if it is detected that the paper size is smaller than B4 (S7
(N of 09), the operation speed of the belt transport mechanism 5 is controlled to 70 rpm in terms of rotation speed based on the rotation speed of the plate cylinder 3 (S711). As described above, when the rotation speed of the plate cylinder 3 is the high-speed mode in the normal printing, the paper size is B4
In the case of the large format or larger, the operation speed of the belt transport mechanism 5 is set to be significantly lower than the rotation speed of the plate cylinder 3. When the sheet size is smaller than B4 size, the operation speed of the belt transport mechanism 5 is further reduced as compared with the case of large size. As described above, when the rotation speed of the plate cylinder 3 is high during normal printing, it is better to make the operation speed of the belt transport mechanism 5 lower than the linear speed of the printing paper 2 fed by the plate cylinder 3. good. This is because if the discharge speed is set too high, too much momentum will be generated at the time of discharge, and the stopper (impact wall) 4
The printing paper 2 is bent or bent in a time signature that has bounced off after colliding with 1 or the like, thereby causing a paper output jam with another printing paper 2 continuously discharged thereafter, This is because it may cause an inconvenient situation such as stopping at a position deviating from a predetermined position due to excessive bouncing. As described above, it is desirable that the printed printing paper 2 is discharged toward the discharge tray 4 at a discharge speed within an appropriate range. Therefore, in order to be able to discharge the printing paper 2 at such an appropriate discharge speed, the rotation speed of the plate cylinder 3 is also taken into account, and the transport speed of the printing paper 2 by the belt transport mechanism 5 is calculated. , The printing paper 2 can be discharged toward the paper discharge table 4 at an appropriate discharge speed, and finally can be stopped exactly at a predetermined position.

As described above, in the normal printing, even when the paper size of the printing paper 2 is remarkably different, such as B3 and B5, and when the rotation speed of the plate cylinder 3 is either medium speed or high speed, The printing paper 2 can be discharged at a suitable discharge speed suitable for the paper size. As a result, the discharged printing paper 2 is finally discharged without causing an inconvenience such as a discharge jam. It can be stopped exactly at a predetermined position on the flat part of the platform 4.

(Embodiment 3) In the third embodiment, a case where normal printing is performed in a stencil printing apparatus according to the present invention will be described with reference to FIG. For the sake of simplicity, the following description will use the first and second sections.
The same parts as those of the embodiment are denoted by the same reference numerals and described. FIG. 8 is a diagram showing a combination of the rotation speed of the plate cylinder 3 and the operation speed of the belt transport mechanism 5, and FIG.
9 is a flowchart showing main operations during normal printing in the stencil printing apparatus according to the embodiment.

For example, when normal printing such as 200 sheets / original document (lot) is performed, generally, the printing paper 2 including the paper size of the printing paper 2 used at that time is used.
Has already been input to the mode setting unit 16 (S9).
01). Therefore, the paper specification detection unit 6 detects the paper size information from the input print mode information and extracts it (S902).

Based on the paper size information, the discharge speed control unit 7 sets both the rotational speed of the plate cylinder 3 and the operation speed of the belt transport mechanism 5 to an optimum speed determined in advance for each of them. Control so that More specifically, the printing paper 2 fed by the rotation of the plate cylinder 3
The final transport speed, that is, the discharge speed of the printing paper 2 accelerated or decelerated by the belt transport mechanism 5 in combination with the linear velocity of the printing paper 2 is set to an accurate discharging speed that can stop the printing paper 2 at a predetermined position. Both the rotation speed of the plate cylinder 3 and the operation speed of the belt transport mechanism 5 are controlled in accordance with the size of the printing paper 2.

In the third embodiment, in order to realize high-speed printing, during normal printing on printing paper 2 smaller than B4 size (N in S903), the rotation speed of the plate cylinder 3 is set to the medium speed mode. (S904), and in the case of normal printing on the printing paper 2 of B4 size or larger (Y in S903), the rotation speed of the plate cylinder 3 is set to the high speed mode (120 rpm).
(S905), the rotation speed of the plate cylinder 3 is set to be variable according to the sheet size of the printing sheet 2. The switching of the setting of the rotation speed mode of the plate cylinder 3 corresponding to the paper size is performed by the discharge speed control unit 7 based on the information on the paper size detected by the paper specification detection unit 6. Good. Alternatively, when a control system for controlling the rotation speed of the plate cylinder 3 is separately provided in the control unit 8, it is needless to say that the control may be performed by the control system. The setting of the rotation speed mode of the plate cylinder 3 is constant during normal printing, and at the start of the printing, the speed suitable for the paper size has already been set. It is desirable that when the printing drum 2 is supplied to the printing drum 3, it is desirable that the printing drum 3 and the belt transport mechanism 5 operate at a constant speed according to the speed setting.
This is the same as in the second embodiment (the reason will be described later).

As described above, when the paper size is B4 size or larger (Y in S903), the rotation speed of the plate cylinder 3 is controlled to 120 rpm (high-speed mode) (S90).
Along with 5), the operation speed of the belt transport mechanism 5 is controlled to 80 rpm in terms of rotation speed based on the rotation speed of the plate cylinder 3 (S906). On the other hand, when the sheet size is smaller than the B4 size (N in S903), the rotation speed of the
At 0 rpm (medium speed mode) (S904), the operation speed of the belt transport mechanism 5 is controlled to 90 rpm in terms of rotation speed based on the rotation speed of the plate cylinder 3 (S907).

As described above, when the sheet size is small, the rotation speed of the plate cylinder 3 is set to a medium speed, and the operation speed of the belt transport mechanism 5 is set to a speed suitable for it.
While realizing high-speed printing, and finally the printing paper 2
Can be set to an appropriate speed when the sheet is discharged toward the sheet discharge table 4. As a result, even if the printing paper 2 has a different paper size, the discharged printed printing paper 2 can be accurately stopped at a predetermined position while realizing high-speed printing.

Here, the belt transport mechanism 5 is a so-called suction belt type transport mechanism, and its main part is configured as shown in FIG. That is, the belt 50 is stretched at both ends by pulleys 51 and 52, and one of the two pulleys 51 and 52 is driven by the belt driving motor 21 via a gear mechanism system 53 and the like. Thus, the belt 50 moves endlessly as a so-called endless belt. A suction suction device 54 using a suction fan is provided below the belt 50, and sucks the air on the belt 50 so that the printing paper 2, which is the object to be conveyed on the belt 50, is sucked. The belt 50 is conveyed while being sucked onto the upper surface thereof.

In such a belt transport mechanism 5 of a so-called suction belt system, the transport speed of the printing paper 2 transported on the belt 50 is reduced due to the fact that the main parts are configured as described above. The running speed of the belt 50 itself, that is, the horizontal moving speed of the upper surface of the belt 50 does not always match. This is because even when the printing paper 2 is conveyed while sucking the upper surface of the belt 50 by suction suction as described above, the printing paper 2 is not completely sucked on the upper surface of the belt 50 in practice, This is due to the fact that they may be slipping on it.

For example, when a large-size printing paper 2 such as A3 size is conveyed, the printing paper 2 fed out of the printing drum 3 has a leading edge before the trailing edge of the printing paper 2 is completely separated from the printing drum 3. Rides on the belt 50, and at the leading end thereof, the conveying force of the belt 50 is transmitted to the printing paper 2 by the frictional force between the upper surface of the belt 50 and the printing paper 2 based on the aerodynamic suction force. Is pulled in the transport direction. At this time, the rear end portion is still caught between the plate cylinder 3 and the press roller, so that the printing paper 2 eventually slides on the upper surface of the belt 50 at this time. Become. When the rear end of the printing paper 2 leaves the plate cylinder 3, the printing paper 2
Is released from the force for stopping the conveyance, and is accelerated by the conveyance force of the belt 50. However, at this time, depending on a combination of the length of the belt 50 in the conveyance direction and the magnitude of the suction force, the final discharge is performed. Immediately before, the conveyance speed of the printing paper 2 may not reach the operation speed of the upper surface of the belt 50 and may end at a low speed. Or, conversely, when conveying printing paper 2 of a small size such as B5 size, for example, the time and distance required for the printing paper 2 to be unwound from the plate cylinder 3 and to leave the plate cylinder 3 can be shortened, It is considered that it is possible to take a longer time and distance to be accelerated by completely riding on the upper surface of the belt 50 after leaving the plate cylinder 3,
However, on the other hand, since the paper size is small, the suction force (or frictional force) applied to the entire area is also small, and the paper 50 slips on the upper surface of the belt 50, and the actual transport speed of the printing paper 2 and the upper surface of the belt 50 are reduced. May not always match the operating speed of the vehicle. For example, when the rotation speed of the plate cylinder 3 is too high during normal printing, the printing paper 2 is conveyed while sliding slightly on the upper surface of the belt 50, and is discharged at a speed higher than a desired discharge speed, or Conversely, if the rotation speed of the plate cylinder 3 is low even during normal printing, the printing paper 2 may slip on the belt 50 and be discharged without being sufficiently accelerated. Therefore, taking into account such a slipping phenomenon of the printing paper 2 at the time of such transportation, at least the belt transportation is performed so as to obtain a suitable discharge speed capable of stopping the printing paper 2 at a predetermined position. It is desirable to control the operating speed of the mechanism 5. Alternatively, it is also desirable to control the rotation speed of the plate cylinder 3 in addition to the above. Therefore, in each of the above-described embodiments, the printing cylinder 2 and the belt 50 are adjusted so that the final discharging speed of the printing paper 2 becomes an appropriate speed after taking into account such a sliding phenomenon of the printing paper 2. The speed is controlled.

Further, the belt transport mechanism 5 of the suction belt 50 system can transport the printing paper 2 with almost no contact except for air on the printed surface of the printing paper 2. However, since the above-described slip phenomenon may occur, the slip phenomenon is calculated in advance, and the rotation speed of the plate cylinder 3 and the operation speed of the belt transfer mechanism 5 are calculated. As described above, it is sufficient to prepare a setting that is calculated backward so as to obtain a final discharge rate by a combination with the above. However, such a setting is further temporally changed to obtain a desired setting. It is assumed that realizing the method of obtaining a suitable printing paper discharge speed is actually a very complicated control method. Also, if the rotation speed of the plate cylinder 3 is changed while stencil printing is being performed on one sheet of printing paper 2, the probability that remarkable unevenness in the print density will occur is greatly increased. Further, generally, by the time printing is started, the specifications of the printing paper 2 to be printed and the user's intention at that time (want to execute)
In many cases, information on various settings relating to printing has already been input manually by the user, and information on such specifications can be detected and extracted as soon as it is input. It is not difficult to detect information on specifications such as the paper size already at the start of the process. In consideration of these points, the printing paper 2 is
It is desirable that the plate cylinder 3 and the belt transport mechanism 5 have already been operated at an appropriate constant speed set in accordance with the specifications of the printing paper 2. .

However, it goes without saying that the method of detecting the specifications such as the paper size of the printing paper 2 is not limited to detecting (extracting) such information manually input to the mode setting unit 16. . In addition, for example, an optical sensor or the like is provided in the middle of a process in which the printing paper 2 is conveyed from the paper feed table 14 to the plate cylinder 3, and when the printing paper 2 passes through the optical sensor, The optical sensor may detect the second paper size. Alternatively, when the printing paper 2 is placed on the paper feed tray 14, a paper specification detecting device (not shown) for automatically detecting (or reading) the specification such as the paper size and weight is added. , Printing paper 2 is on paper feed table 1
It is also possible to detect the paper size and the like at the stage when the number is set to "4". More specifically, for example, in order to automatically detect the paper size at the stage when the printing paper is placed on the paper feed tray 14, when the print paper is placed on the paper feed tray 14, Or a paper feed fence that is automatically set to touch both ends in the width direction of the printing paper,
A paper width detecting device that detects the size of the printing paper placed on the paper feed tray 14 in the width direction by detecting the position of the paper feed fence; A paper length detecting device that detects the length of the printing paper in the transport direction (paper length) by detecting the position of the rear end portion of the paper in the transport direction using a reflection-type optical sensor or the like; Based on the length in the transport direction (paper length), a determination unit that determines the paper size of the printing paper placed on the paper feed table 14 at that time is provided, and these determine the paper size of the printing paper. It can be detected automatically. In any case, it is needless to say that any detection means can be applied as long as the specifications such as the paper size and weight of the printing paper can be detected before the printing paper 2 reaches the plate cylinder 3. .

The setting of the rotation speed mode of the plate cylinder 3 is
It is needless to say that the operation speed of the belt transport mechanism 5 only needs to be controlled according to the specifications of the printing paper 2 when the mode is fixed to only one type of mode, unlike the above embodiments. .

In each of the above embodiments, the printing paper 2
As described above, a case was described in which standard so-called plain paper such as B4 or B5 having standardized paper sizes and weights was used, and the paper size was detected as the specification of the printing paper 2. However, the present invention is not limited to this, and may be applied to special specifications (paper size, weight, thickness, etc.) such as greeting cards and postcards. In addition, when printing is performed on the printing paper 2 having such special specifications, it is possible to detect not only information about the paper size but also information such as weight and thickness, and control the discharge speed based on the information. desirable. Also, even when printing on standard plain paper,
The weight of each print sheet 2 may be detected, and the discharge speed may be controlled based on the information on the weight.

Further, in the above embodiment, a practical and simple method of separately providing the motors 20 and 21 for the plate cylinder 3 and the belt transport mechanism 5, respectively, is employed, so that the plate cylinder 3 and the belt Although both the transport mechanism 5 and the transport mechanism 5 can be controlled more freely and independently, it goes without saying that the drive power source or the drive mechanism system is not limited to such an independent motor alone. In addition, for example, the driving force is transmitted from the single motor to the plate cylinder 3 and the belt transport mechanism 5 through a variable gear ratio variable gear system or a fluid transmission, respectively. It is also possible to make it possible to control the rotation speed of the belt transport mechanism 5 and the belt transport mechanism 5 individually and independently.

In the above-described embodiment, the method of determining whether the paper size is equal to or larger than B4 size is determined.
Although the case where the specification of the printing paper 2 is detected has been described, such a determination logic is, for example, less than A3 to more than B4,
Less than B4 to A4 or more, less than A4 to B5 or more,
The discharge speed may be further finely divided so as to control the discharge speed more finely. As a result, the position where the discharged printing paper 2 finally stops on the paper discharge table 4 can be more accurately converged in a predetermined area.

The discharged printed paper is
As long as it can be stopped accurately at a predetermined position on the paper discharge tray, it may be bounced off once by the stopper 41 and then stopped at a flat predetermined position on the paper discharge tray, or directly fly to the predetermined position and stop. Needless to say, this may be done.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a stencil printing apparatus according to an embodiment.

FIG. 2 is a diagram schematically illustrating a schematic configuration of a plate cylinder, a belt transport mechanism, and a paper discharge tray of the stencil printing apparatus of the present embodiment.

FIG. 3 is a partially omitted perspective view showing a schematic mechanical configuration of the stencil printing apparatus of the present embodiment.

FIG. 4 is a flowchart showing main operations at the time of first printing in the stencil printing apparatus according to the first embodiment;

FIG. 5 is a diagram illustrating a relationship among a rotation speed of a plate cylinder, an operation speed of a belt conveyance mechanism, and a paper size in the stencil printing apparatus according to the first embodiment.

FIG. 6 is a diagram illustrating a relationship among a rotation speed of a plate cylinder, an operation speed of a belt conveyance mechanism, and a sheet size in the stencil printing apparatus according to the second embodiment.

FIG. 7 is a flowchart showing main operations during normal printing in the stencil printing apparatus according to the second embodiment;

FIG. 8 is a diagram illustrating a relationship among a rotation speed of a plate cylinder, an operation speed of a belt conveyance mechanism, and a sheet size in a stencil printing apparatus according to a third embodiment.

FIG. 9 is a flowchart illustrating main operations during normal printing in the stencil printing apparatus according to the third embodiment;

[Explanation of symbols]

 Reference Signs List 1 stencil paper 2 printing paper 3 plate cylinder 4 paper discharge tray 5 belt transport mechanism 6 paper specification detection unit 7 discharge speed control unit 8 control unit

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[Procedure amendment]

[Submission date] February 20, 2001 (2001.2.2)
0)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction contents]

When the unperforated stencil sheet 1 is fed out, the thermal head 10 performs thermal perforation on the basis of image data obtained corresponding to the above-mentioned original. When the heat-sensitive perforation corresponding to the original is completed, the cutter mechanism 12 is operated, and the perforated portion of the stencil sheet 1 that has been unwound from the roll and remains in a belt shape is in a state of a single sheet (one sheet). Then, the portion corresponding to the rear end is cut.

Claims (8)

[Claims] 1. A stencil printing machine having a plate cylinder on which a stencil sheet is wound and prints on a printing sheet while rotating, and a sheet discharging means for discharging the printing sheet, wherein the specification of the printing sheet is satisfied. A stencil printing apparatus, which controls a discharge speed of the printing paper discharged from the paper discharging means. 2. A stencil printing machine comprising: a plate cylinder on which a stencil sheet is wound and prints on a printing sheet while rotating; and a sheet discharging means for conveying the printing sheet and discharging the printing sheet toward a discharge receiving portion. In the apparatus, the paper is discharged from the paper discharging unit by controlling a transport speed of the paper discharging unit based on the detected specification of the printing paper. A stencil printing apparatus comprising: a discharge speed control means for controlling a discharge speed of the printing paper. 3. A stencil printing machine comprising: a plate cylinder on which a stencil sheet is wound and prints on a printing sheet while rotating; and a sheet discharging means for conveying the printing sheet and discharging the printing sheet toward a discharge receiving portion. In the apparatus, paper specification detecting means for detecting the specification of the printing paper, and controlling the rotation speed of the plate cylinder and the transport speed of the paper discharging means based on the detected specification of the printing paper, A stencil printing apparatus comprising: a discharge speed control unit that controls a discharge speed of the printing paper discharged from the paper discharge unit. 4. A stencil printing machine comprising a plate cylinder on which a stencil sheet is wound and prints on a printing sheet while rotating, and a sheet discharging means for conveying the printing sheet and discharging the printing sheet toward a discharge receiving portion. In the apparatus, paper specification detecting means for detecting the specification of the printing paper, and controlling the conveyance speed of the paper discharging means based on the rotation speed of the plate cylinder and the specification of the printing paper,
A stencil printing apparatus comprising: a discharge speed control unit that controls a discharge speed of the printing paper discharged from the paper discharge unit. 5. The printing apparatus according to claim 1, wherein the specification is at least one of a sheet size or an outer dimension of the printing sheet and a weight per sheet.
A stencil printer according to any one of the preceding claims. 6. The discharge speed control means for controlling the discharge speed so that the printing paper stops within a predetermined area of the discharge receiving portion. A stencil printer according to any one of the preceding claims. 7. The printing apparatus according to claim 1, wherein a rotation speed of the plate cylinder and a conveyance speed of the sheet discharging unit are set to be controlled independently of each other. Stencil printing machine. 8. A stencil printing apparatus according to claim 7, wherein a motor for driving said plate cylinder and a motor for driving said sheet discharging means are provided separately.