JP2010036395A - Plate loading controller of stencil printing machine and plate loading method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate loading controller of a stencil printing machine which can wind-attach a stencil paper on outer circumference of a printing plate cylinder. <P>SOLUTION: The plate loading controller includes: a plate making mechanism 2; the printing plate cylinder 5; a bendable sheet member 26 cantilevered at the end of the discharge downstream of the plate making mechanism 2; a rotation amount detection part which detects the respective amounts of rotation of the platen roller 23 and the printing plate cylinder 5; a controlling part wherein the driving part of the printing plate cylinder 5; and the driving part of the platen roller 23 are electrically connected. A loosening formation process, wherein the stencil paper N is loosened by calculating a stencil paper discharge speed V1 by the platen roller 23 and a stencil paper wind-attaching speed V2 by the printing plate cylinder 5 based on the data input from the rotation amount detection part and making the stencil paper wind-attaching speed V2 relatively slower than the stencil paper discharge speed V1, and a bending process, wherein the loosening is removed by making the stencil paper wind-attaching speed V2 faster than the stencil paper discharge speed V1 and bending the sheet member 26 by the stencil paper N, are conducted alternately. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plate-feeding control device and a plate-feeding control method for a stencil printing machine including a plate-making mechanism having a thermal head and a platen roller, and a printing plate cylinder that performs printing.

  In the stencil feeding operation of this type of stencil printing machine, when the stencil sheet made by the stencil making mechanism is wound around the printing plate cylinder, the leading edge of the stencil sheet is clamped by the clamping part of the printing plate cylinder. Then, by rotating the printing plate cylinder, the stencil sheet is wound around the outer peripheral surface of the printing plate cylinder, and usually, the winding (plate-making) operation is performed in parallel with the plate-making operation by the plate-making mechanism.

In the winding work around the outer periphery of the printing plate cylinder, in order to ensure printing quality, the stencil sheet is not wrinkled or air is not mixed between the printing plate cylinder and the stencil sheet. Therefore, it is required to wind a stencil sheet. For this reason, conventionally, a specially provided sponge roller and a tension mechanism having a spring are provided on the downstream side of the platen roller, and back tension is applied to the stencil sheet being wound by the tension mechanism (patent) References 1 and 2).
JP 2001-80194 A JP 2006-123258 A

  However, if a special sponge roller or tension mechanism is provided to apply back tension to the stencil paper, a space for placing the tension mechanism and the like is required, and the stencil printing machine becomes larger in size and parts. Costs are also incurred.

  An object of the present invention is to provide a special tension mechanism that does not include a sponge roller, a spring, or the like, and to prevent the stencil printing machine from becoming large-sized, while winding the stencil sheet around the outer peripheral surface of the printing plate cylinder without wrinkling. The present invention is to provide a plate feeding control device and a plate feeding control method of a stencil printing press that can be worn.

  In order to solve the above-described problems, the present invention provides a plate making mechanism for making a plate by holding a stencil sheet before plate making with a platen roller and a thermal head and carrying out heat perforation and carrying it out by the platen roller, and carrying out the plate making mechanism. A stencil printing machine having a clamping part for sandwiching the leading end of the stencil sheet and having the stencil sheet wound around the outer peripheral surface by rotation; A bendable thin plate member that is cantilevered at an end, a rotation amount detection unit that detects rotation amounts of the platen roller and the printing plate cylinder, the rotation amount detection unit, and a driving unit of the printing plate cylinder And a control unit electrically connected to the drive unit of the platen roller, and the control unit is configured to control the platen roller based on the data input from each rotation amount detection unit. A slack forming step of calculating a base paper unloading speed by the printing plate cylinder and a base paper winding speed by the printing plate cylinder, and forming a slack in the stencil base paper by making the base paper winding speed relatively smaller than the base paper unloading speed; Controlling at least one of the two drive units so that a paper winding speed is made larger than the base paper carry-out speed to remove the slack and alternately perform a tensioning process in which the thin plate member is bent by the stencil base paper. It is characterized by.

  According to the above configuration, the stencil sheet can be wound around the outer peripheral surface of the printing plate cylinder without wrinkling while keeping the stencil printing machine compact without providing a special tension mechanism including a sponge roller or a spring. It is possible to perform plate feeding work with good quality.

  In the plate feeding control device of the stencil printing machine, the printing plate cylinder can be stopped in the slack forming step.

  According to the said structure, control of the printing plate cylinder drive part in a slack formation process can be simplified.

  In the stencil printing machine, the thickness of the thin plate member can be set to 100 μm to 200 μm.

  According to the above configuration, an appropriate magnitude of tension can be applied to the stencil sheet without breaking the stencil sheet due to an appropriate strength of the thin plate member.

  In the stencil feeding control apparatus of the stencil printing machine, the protruding amount of the thin plate member from the cantilever support point can be set to 8 mm to 15 mm.

  According to the said structure, the arrangement | positioning space of a thin plate member can be small, and the compactness of a plate-making mechanism can be maintained.

  In the stencil feeding control apparatus of the stencil printing machine, the thin plate member has a distal end positioned on a side opposite to a rotation direction of the printing plate cylinder from the base end, and approaches the outer peripheral surface of the printing plate cylinder as it advances toward the distal end side. Can be arranged.

  According to the above configuration, the range of the predetermined deflection amount by the thin plate member can be selected in a large range.

  The present invention also provides a stencil feeding control method for a stencil printing machine, in which a stencil sheet before plate making is sandwiched between a platen roller and a thermal head of a plate making mechanism and heated and punched, and the platen roller uses the platen roller. In the plate feeding control method of a stencil printing machine in which the leading end portion of the stencil sheet unloaded from the plate making mechanism is clamped by the clamping portion of the printing plate cylinder and wound around the outer peripheral surface of the printing plate cylinder by rotation, the printing plate A slack forming step of forming a slack in the stencil sheet by making the base paper winding speed by the cylinder relatively smaller than the base paper unloading speed by the platen roller, and the base paper winding speed relatively larger than the base paper unloading speed And the tension process which bends the thin plate member which was cantilever-supported by the carrying-out downstream end part of the plate-making mechanism while removing the said slack is included.

  In the plate feeding control method of the stencil printing machine, in the slack forming step, the drive unit can be controlled to stop the printing plate cylinder.

  In each of the above-described plate supply control methods, the same effect as that of the plate supply control device can be obtained.

(Overall configuration of stencil printing machine)
1 to 6 show an example of a stencil printing machine provided with a stencil printing control device according to the present invention. FIG. 1 is a longitudinal sectional view of the stencil printing machine, FIG. 2 is a block diagram showing a control system, and FIG. It is an expanded sectional view of the carrying-out downstream end part of the plate-making mechanism 2, and its vicinity. In FIG. 1, the stencil printing machine includes a printing unit 1 for transferring (printing) an image onto a printing paper P, and a plate making mechanism 2 for making a stencil sheet N. The printing unit 1 includes a hollow cylindrical printing plate cylinder 5 and a pressing roller 6 facing the printing plate cylinder 5 so as to be able to contact from below.

  A large number of ink transmission holes are formed in the peripheral wall of the printing plate cylinder 5, and a clamp portion 8 for sandwiching the leading end portion of the stencil sheet N is provided on the outer peripheral surface of the printing plate cylinder 5. An ink supply mechanism including an ink roller 10 and a squeegee roller 11 is disposed inside the printing plate cylinder 5. The ink roller 10 abuts on the lower end of the inner peripheral surface of the plate cylinder 5, and the squeegee roller 11 is Ink is supplied from an ink supply source (not shown) via an ink supply hose or the like to an ink reservoir 14 formed in contact with the outer peripheral surface of the ink roller 10 and the contact portion between the ink roller 11 and the squeegee roller 11. It is like that.

  The printing unit 1 prints (image forms) printing paper P, which is fed one by one in the direction of arrow F from a paper feeding device (not shown), between the lower end of the printing plate cylinder 5 and the pressing roller 6. Discharge to the paper discharge device. That is, during printing, the ink roller 10 rotates in the direction of arrow B in synchronization with the rotation of the printing plate cylinder 5 in the direction of arrow A, and the ink in the ink reservoir 14 is applied to the outer peripheral surface of the ink roller 10 by the squeegee roller 11. Then, the ink reaches the lower end of the ink roller 10 and is supplied to the inner peripheral surface of the printing plate cylinder 5. The ink supplied to the inner peripheral surface of the printing plate cylinder 5 passes through the ink transmission holes of the printing plate cylinder 5 and the image forming perforations of the stencil sheet N and is transferred to the printing paper P.

(Plate making mechanism)
The plate making mechanism 2 includes a base paper roll 21 formed by winding a long stencil sheet N, a thermal head 22 for making a plate by heating and punching the stencil sheet N, and pressing the stencil sheet N against the heater surface of the thermal head 22. A platen roller 23 that rotates in the direction of arrow C and carries the stencil sheet N in the direction of arrow D at a predetermined base paper unloading speed V1, and is disposed on the downstream side of the platen roller 23 to move the stencil sheet N to a predetermined length. The guide member 27 disposed on the downstream side of the cutter 25 is provided with a flexible thin plate member 26 that is a main part of the present invention.

  In FIG. 3, the thin plate member 26 is made of a soft resin, is cantilevered on the upper surface of the guide member 27 disposed on the carry-out path, and protrudes from the tip end of the guide member 27 by a length W in the carry-out direction D. ing. The protrusion length W is preferably within a range of 8 mm to 15 mm, for example, and is set to approximately 10 mm in the embodiment. The thin plate member 26 is arranged in a substantially horizontal posture, and with respect to the printing plate cylinder 5, the leading end 26a is positioned on the printing plate cylinder 5 side with respect to the base end 26b, and the leading end 26a is printed with respect to the base end 26b. The plate cylinder 5 is located on the side opposite to the rotation direction A. Further, the thickness of the thin plate member 26 is preferably 100 μm to 200 μm, and in this embodiment, it is set to 100 μm, 125 μm or 188 μm.

  At the intersection of the extension line of the thin plate member 26 and the outer peripheral surface of the printing plate cylinder 5, the angle θ1 formed between the tangent line of the printing plate cylinder 5 and the thin plate member 26 is set in a range of 15 ° to 45 °, for example.

(Control system)
In FIG. 2, the printing plate cylinder 5 is linked to a printing plate cylinder driving unit, for example, a DC motor 31 through a transmission mechanism, and the DC motor 31 allows a desired base paper winding speed (circumferential speed) V <b> 2. It is designed to rotate. Of course, the base paper winding speed V <b> 2 can be changed by changing the rotational speed of the DC motor 31. This speed change includes a stop state (base paper winding speed V2 = 0), and therefore, intermittent rotation that repeats rotation and stop is also possible. Further, the rotation amount (rotation speed) of the printing plate cylinder 5 can be detected by an encoder (rotation amount detection unit) 32 disposed on the axis of the printing plate cylinder 5 or the DC motor 31.

  On the other hand, the platen roller 23 is linked to a platen roller driving unit, for example, a stepping motor 34 via a transmission mechanism, and the stepping motor 34 makes a desired amount (or desired time) at a desired raw paper carry-out speed V1. Only to rotate. The stepping motor 34 incorporates a rotation amount detection unit 35 that can detect the rotation amount and rotation angle of the stepping motor 34. In the drawing, the encoder 32 of the printing plate cylinder 5 is associated with the notation method. The rotation amount detector 35 is displayed outside the stepping motor 34.

  The encoder 32 and the rotation amount detection unit 35 are electrically connected to the input interface of the control unit 40, and each detected data is input to the control unit 40. On the other hand, the DC motor 31 and the stepping motor 34 are electrically connected to the output interface of the control unit 40, and their rotational speed (resulting in the base paper unloading speed V1 and base paper winding speed V2), the driving time, and the like are controlled. It has come to be.

  As a control program incorporated in the control unit 40, a slack forming process for forming slack in the stencil sheet N, a tensioning process for removing the slack of the formed stencil sheet N and bending the thin plate member 26 with the stencil sheet N, A program that alternately executes is incorporated. Specifically, the following first control method or second control method is incorporated.

(First control method)
(1) In the slack forming step, both the printing plate cylinder 5 and the platen roller 23 are rotated, and the rotational speed of both is set to be higher than the base paper unloading speed V1 by the platen roller 23 when the base paper winding speed V2 by the printing plate cylinder 5 is Set to be a certain amount smaller. Preferably, both rotation speeds are set so that V1-V2 falls within a range of 1 mm / s to 11 mm / s. In this embodiment, V1-V2 is set to be about 1 mm / s to 2 mm / s. Thereby, it is possible to gradually form a slack in the stencil sheet N from the guide member 27 to the outer peripheral surface of the printing plate cylinder 5.

(2) Next, as the tensioning step, both the printing plate cylinder 5 and the platen roller 23 are rotated, and when the amount of slack in the slack forming step exceeds a predetermined amount (for example, 5 mm), the original by the printing plate cylinder 5 The rotational speed of the printing plate cylinder 5 is increased so that the paper winding speed V2 is higher than the base paper carry-out speed V1 by the platen roller 23. In this way, by increasing the rotation speed of the printing plate cylinder 5, it is possible to remove the slack of the stencil sheet N and to bend the thin plate member 26 with the stencil sheet N.
(3) In the tensioning step, when the amount of bending of the thin plate member 26 exceeds a predetermined amount, the base paper winding speed V2 by the printing plate cylinder 5 is smaller than the base paper carry-out speed V1 by the platen roller 23. The rotational speed of the printing plate cylinder 5 is decreased, and the process returns to the slack forming process.

(Second control method)
As a slack forming step, the printing plate cylinder 5 is stopped (base paper winding speed V2 = 0), and only the platen roller 23 is rotated at a predetermined base paper carry-out speed V1. As a result, slack can be gradually formed on the stencil sheet N from the guide member 27 to the outer peripheral surface of the printing plate cylinder 5.

  On the other hand, as the tensioning step, when the amount of slack exceeds a predetermined amount (for example, 5 mm), the printing plate cylinder 5 is rotated so that the base paper winding speed V2 is higher than the base paper carry-out speed V1 by the platen roller 23. . That is, the printing plate cylinder 5 is rotated so that the base paper winding speed V2 is larger than the base paper carry-out speed V1, thereby removing the slack of the stencil base paper N and bending the thin plate member 26. When the amount of deflection exceeds a predetermined amount, the printing plate cylinder 5 is brought into a stopped state and returned to the slack forming step. In short, while the platen roller 23 makes a plate at a constant base paper carry-out speed V1, the printing plate cylinder 5 is operated intermittently at a base paper winding speed V2 larger than the base paper carry-out speed V1.

  In the first and second control methods, the base paper carry-out speed V1 by the platen roller 23 is kept constant in both the slack forming process and the tensioning process. For example, the base paper carry-out speed V1 is maintained in the range of 50 mm / s to 60 mm / s, and the slack is formed by changing the base paper winding speed V2 by the printing plate cylinder 5 with respect to the constant base paper carry-out speed V1. The process and the tensioning process can be performed alternately.

(Plate making and winding work based on the first control method)
The plate making and winding (plate making) operations based on the first control method will be described with reference to FIGS.

(1) FIG. 3 shows a clamping process in which the leading edge of the stencil sheet N made by the plate making process is clamped by the clamp part 8 of the printing plate cylinder 5 at the start of the plate feeding operation. That is, when the plate feeding operation is started, the printing plate cylinder 5 is stopped, and in this stopped state, the clamp portion 8 is located at an initial position in the vicinity of the plate making mechanism 2 and is in an open state. On the other hand, in the plate making mechanism 2, the stencil sheet N is sandwiched between the thermal head 22 and the platen roller 23 and heated and punched to sequentially make a plate from the leading end side, and the platen roller 23 carries it out in the direction of arrow D. Is done. Then, when the leading end of the stencil sheet N passes through the upper surface of the thin plate member 26 in a linearly extended state and is fed into the clamp unit 8, the clamp unit 8 is closed and the leading end of the stencil sheet N is sandwiched.

(2) FIG. 4 shows a state immediately before entering the first deflection forming process after the clamping process. That is, the printing plate cylinder 5 having the tip of the stencil sheet N held between the clamps 8 is short-time so that the stencil sheet N is wound at a base paper winding speed V2 higher than the base paper unloading speed V1 by the platen roller 23. Rotating in the direction of arrow A, the stencil sheet N is pulled to such an extent that the thin plate member 26 hardly bends.

(3) FIG. 5 shows the first slack formation step. From the state of FIG. 4, the rotational speed of the printing plate cylinder 5 is decreased so that the base paper winding speed V2 is slower than the base paper carry-out speed V1. Yes. That is, while the platen roller 23 carries out the stencil sheet N at a constant base paper carry-out speed V1, the printing plate cylinder 5 is in the direction of arrow A so that the base paper winding speed V2 is lower than the base paper carry-out speed V1. It is rotating. Therefore, the stencil sheet N is wound around the outer peripheral surface of the printing plate cylinder 5, but gradually between the tip of the guide member 27 and the outer peripheral surface of the printing plate cylinder 5 due to the speed difference (V1−V2). A slack is formed. When the amount of slack exceeds a predetermined amount (for example, 5 mm), the rotation speed of the printing plate cylinder 5 is increased so that the base paper winding speed V2 is larger than the base paper carry-out speed V1.

(4) FIG. 6 shows a tensioning step after the slack forming step, and the printing plate cylinder 5 is rotated so that the base paper winding speed V2 is higher than the base paper unloading speed V1, so that the stencil base paper N The slack is removed and the printing plate cylinder 5 is further rotated to bend the thin plate member 26 and apply a back tension to the stencil sheet N. Therefore, the stencil sheet N is wound around the outer peripheral surface of the printing plate cylinder 5 without wrinkles and without entering air between the outer peripheral surface of the printing plate cylinder 5. When the bending amount of the thin plate member 26 reaches a predetermined amount, this time, the rotational speed of the printing plate cylinder 5 is decreased so that the base paper winding speed V2 is smaller than the base paper carry-out speed V1 by a predetermined amount. As a result, the thin plate member 26 is returned to the linearly stretched state shown in FIG. 4, and slack is formed again on the stencil sheet N as shown in FIG.

(5) In this way, by repeatedly performing the bending formation process and the tensioning process, the entire stencil sheet is placed on the outer peripheral surface of the printing plate cylinder 5 without wrinkling and without air mixing. Can be wound.

(6) When the stencil sheet N for one sheet is made, the stencil sheet N that has been made is separated from the subsequent stencil sheet portion by the cutter 25.

(Plate making and winding work according to the second control content)
The plate feeding operation based on the second control method also changes sequentially from the state shown in FIG. 3 to the state shown in FIG. 6 in the same manner as in the first control method. 6 and FIG. 6 is repeated, and the operation substantially different from the first control method is that the printing plate cylinder 5 is stopped in the deflection forming process of FIG.

(Compensation for delay in rotation amount of printing plate cylinder 5)
The encoder 32 in FIG. 2 detects the rotation amount of the DC motor 51 or the printing plate cylinder 5 by the pulse count, but the printing detected by the pulse count of the encoder 32 due to the load in driving the printing plate cylinder 5. The actual amount of rotation of the printing plate cylinder 5 may be smaller than the theoretical amount of rotation of the plate cylinder 5. For example, when the printing plate cylinder 5 is intermittently rotated as in the second control, when the printing plate cylinder 5 is stopped, the printing plate cylinder 5 may slightly return in the direction opposite to the rotation direction A. Due to the return of the cylinder 5, the actual rotation amount of the printing plate cylinder 5 may be smaller than the theoretical rotation amount already detected by the pulse count of the encoder 32.

In such a case, in order to make the theoretical rotation amount by the encoder 32 coincide with the actual rotation amount of the printing plate cylinder 5, as shown in FIG. Detected portions (slits, protrusions, etc.) 50 for detecting the detected portion 50 are provided. On the other hand, a predetermined rotation angle position sensor 51 for detecting the detected portion 50 is provided on the printing press main body side, and the printing plate cylinder 5 is actually rotated. A method of detecting the amount can be employed. That is, the actual rotation amount of the printing plate cylinder 5 is detected by detecting the detected portion 50 by the predetermined rotation angle position sensor 51, while the predetermined rotation angle position sensor 51 is detected by the pulse count of the encoder 32. The amount of rotation from when the theoretical rotation amount corresponding to the predetermined rotation angle position detected in step S3 is detected until the printing plate cylinder 5 actually rotated to the predetermined rotation angle position is detected by the predetermined angle position sensor 51 is expressed by the encoder 32. Detect with pulse value by. The detected pulse value is a pulse value that the encoder 32 counts with respect to the actual rotation amount of the printing plate cylinder 5.
Therefore, as a simple compensation method, the pulse count number of the encoder 32 is returned to the state obtained by subtracting the extra pulse value from the actual pulse count number, and counting is started again. Thereby, the pulse count number of the encoder 32 can be matched with the actual rotation amount of the printing plate cylinder 5, and the delay amount of the rotation amount of the printing plate cylinder 5 can be compensated.

  Further, in order to eliminate the problem due to the delay in the rotation amount of the printing plate cylinder 5 during the actual plate feeding operation, it corresponds to a numerical value obtained by adding the detected extra pulse value to the pulse value at the initial setting. In addition, it is possible to increase the speed of the printing plate cylinder 5 from the initial rotation speed and substantially compensate the delay amount of the rotation amount of the printing plate cylinder 5.

(Effects of the embodiment)
(1) According to the above-described embodiment, it is possible to automatically apply the back tension to the stencil sheet N during the plate feeding operation by simply providing the thin plate member 26 having a simple structure. It is possible to prevent the occurrence of wrinkles. That is, without providing a special tension mechanism having a spring or the like, it is possible to prevent wrinkling of the stencil sheet N during stencil feeding while preventing an increase in size of the stencil printing machine.

  Incidentally, when the thickness of the thin plate member 26 is 100 μm, the protrusion amount W is 10 mm, and the predetermined amount of slack in the slack forming process (allowable deflection amount) is set to 5 mm, the value of the base paper unloading speed V1 to the base paper winding speed V2 is set. When it was set in the range of 1 mm to 5 mm, wrinkles were not confirmed on the stencil sheet.

  Further, when the thickness of the thin plate member 26 is 125 μm, the protrusion amount W is 10 mm, and the predetermined amount of slack in the slack forming step (allowable deflection amount) is set to 5 mm, the value of the base paper carry-out speed V1-base paper winding speed V2 is Even when the thickness was set in the range of 1 mm to 9 mm, wrinkles were not confirmed on the stencil sheet.

  Further, when the thickness of the thin plate member 26 is 188 μm, the protrusion amount W is 10 mm, and the predetermined amount of slack in the slack forming step (allowable deflection amount) is set to 5 mm, the value of the base paper unloading speed V1 to the base paper winding speed V2 is Even when the thickness was set in the range of 1 mm to 11 mm, wrinkles were not confirmed on the stencil sheet.

(2) Since the base paper unloading speed V1 by the platen roller 23 is kept constant and the base paper winding speed V2 by the printing plate cylinder 5 is increased or decreased, the bending forming process and the tensioning process are repeatedly executed. Plate making can always be performed at a constant plate making speed, and the plate making quality can be maintained high.

[Other Embodiments of the Invention]
(1) In the above embodiment, the deflection forming step and the tensioning step are repeatedly executed by changing the rotation speed of the printing plate cylinder 5, but the bending is performed by changing the rotation speed of the platen roller 23. It is also possible to control to repeatedly execute the forming process and the tensioning process.

(3) The drive unit of the printing plate cylinder 5 and the drive unit of the platen roller 23 are not limited to DC motors and stepping motor motors, and other motors can be used as appropriate.

1 is a side view of a stencil printing machine provided with a stencil feeding control device according to the present invention. It is a block diagram which shows the control system of the plate feeding control apparatus of FIG. FIG. 2 is an enlarged cross-sectional view of a main part of FIG. 1 showing a stencil sheet clamping process at the start of a plate feeding operation. It is an expanded sectional view of the principal part of FIG. 1 which shows the state at the time of the slack formation process start in plate feeding operation | work. It is an expanded sectional view of the principal part of FIG. 1 which shows the slack formation process in plate feeding work. It is an expanded sectional view of the principal part of FIG. 1 which shows the tension | tensile_strength process in plate feeding work.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printing unit 2 Plate making mechanism 5 Printing plate cylinder 8 Clamp part 21 Base paper roll 22 Thermal head 23 Platen roller 26 Thin plate member 31 DC motor (an example of printing plate cylinder drive part)
32 Encoder (Rotation amount detector)
34 Stepping motor (example of platen roller drive)
35 Rotation amount detection unit 40 Control unit N Stencil paper

Claims (7)

A stencil sheet is made by sandwiching a stencil sheet before making a plate by a platen roller and a thermal head and punching it by heating, and a plate making mechanism for unloading the stencil sheet from the platen roller. And a stencil printing machine having a stencil sheet wound around the outer peripheral surface by rotation, and a stencil feeding control device of a stencil printing machine,
A bendable thin plate member that is cantilevered at the unloading downstream end of the plate making mechanism;
A rotation amount detection unit for detecting rotation amounts of the platen roller and the printing plate cylinder;
A control unit electrically connected to the rotation amount detection unit, the printing plate cylinder drive unit, and the platen roller drive unit;
The control unit calculates a base paper unloading speed by a platen roller and a base paper unwinding speed by a printing plate cylinder based on data input from each rotation amount detection unit, and the base sheet unwinding speed is calculated as the base paper unloading speed. A slack forming step of forming a slack in the stencil sheet by making it relatively smaller than the stencil sheet, and a stencil sheet is bent by the stencil sheet while removing the slack by making the stencil winding speed higher than the unloading speed of the stencil sheet A stencil feeding control apparatus for a stencil printing machine, wherein at least one of the two drive units is controlled to alternately execute a tensioning step. In the stencil feeding control device of the stencil printing machine according to claim 1,
A plate feeding control device for a stencil printing machine for stopping the printing plate cylinder in the slack forming step. In the stencil feeding control device of the stencil printing machine according to claim 1 or 2,
The plate feeding control device of a stencil printing machine, wherein the thickness of the thin plate member is set in a range of 100 μm to 200 μm. In the stencil feeding control device of the stencil printing machine according to any one of claims 1 to 3,
The stencil printing machine of the stencil printing machine, wherein the amount of protrusion of the thin plate member from the cantilever support point is set to 8 mm to 15 mm. In the stencil feeding control device for a stencil printing machine according to any one of claims 1 to 4,
The thin plate member has a leading end positioned on the opposite side of the base plate from the rotation direction of the printing plate cylinder, and is disposed so as to approach the outer peripheral surface of the printing plate cylinder as it proceeds to the leading end side. Control device. The stencil sheet before the plate making is sandwiched between the platen roller and the thermal head of the plate making mechanism and heated and punched to carry out the plate making, and the platen roller carries it out. In the plate feeding control method of the stencil printing machine that is sandwiched by the part and wound around the outer peripheral surface of the printing plate cylinder by rotation,
A slack forming step of forming a slack in the stencil base paper by making the base paper winding speed by the printing plate cylinder relatively smaller than the base paper unloading speed by the platen roller, and the base paper winding speed to be lower than the base paper unloading speed. A tensioning step of relatively large and removing the slack and bending the thin plate member cantilevered at the downstream end of the plate making mechanism;
Including stencil printing plate feeding control method. In the stencil feeding control method of the stencil printing machine according to claim 6,
In the slack forming step, a plate feeding control method for a stencil printing machine, wherein the drive unit is controlled to stop the printing plate cylinder.

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