JPH06155880A - Stencil printer - Google Patents

Abstract

PURPOSE:To execute printing with a required density even when a printing speed changes, by a method wherein a pressure contact force of a press roller against a plate cylinder is set variably in accordance with set information on the printing speed. CONSTITUTION:When stencil paper is set and detected by a photosensor 101 and set information on the number of print copies, a printing speed and a printing density is inputted from an operating panel 5, this information is stored in each area of RAM 220. Information on the temperature of ink, a non-working period from the previous working of the printer, the number of copies already printed, etc., are stored in the RAM 220 by a humidity sensor 104 and a working state detecting mechanism 105. When a start key is operated, stencil paper is clamped by a clamping mechanism 21 and a motor 33 for driving a plate cylinder is driven. Basing on set information, the ink temperature information and the information on the using state of the printer, at this time, the number of pulses of a pulse motor 50 is controlled and a pressure contact force of a press roller is controlled so that a prescribed printing density be obtained.

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 print density adjusting mechanism in a stencil printing apparatus whose printing speed is variably set.

[0002]

2. Description of the Related Art A stencil printing machine is well known in which a stencil sheet is wound around the outer periphery of a cylindrical plate cylinder and a printing paper is pressed against the stencil sheet by a press roller to perform stencil printing in a pressing manner.

In the stencil printing apparatus as described above, the pressure contact force of the press roller with respect to the plate cylinder is variably set according to the print density information set by the print density information setting means such as the print density setting key provided on the operation panel. Therefore, it has already been proposed to variably set the print density of the image to be printed on the printing paper, which is disclosed, for example, in Japanese Patent Laid-Open No. 62-127276.

[0004]

In the stencil printing apparatus, one of the factors that influences the printing density is the printing speed. In the stencil printing apparatus in which the printing speed is variably set, the printing density is adjusted by adjusting the printing speed. Change.

For this reason, when the printing speed is changed, the printing density changes, and it becomes impossible to obtain a printed matter with a constant density.

In view of the above problems, the present invention provides a stencil printing apparatus which is configured to automatically compensate the printing density with respect to the printing speed and improves the stencil printing of a desired density regardless of changes in the printing speed. The purpose is to

[0007]

In order to achieve the above-mentioned object, the stencil printing apparatus according to the present invention prints by pressing a printing paper onto a stencil paper wrapped around the outer circumference of a cylindrical printing cylinder by a press roller. In the stencil printing apparatus for performing the printing speed information setting means for setting the printing speed information,
And a pressure contact force variable setting unit for variably setting a pressure contact force of the press roller with respect to the plate cylinder according to the print speed information set by the print speed information setting unit.

[0008]

According to the above-described structure, the pressure contact force of the press roller with respect to the plate cylinder is variably set according to the print speed information set by the print speed information setting means.

[0009]

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

FIG. 1 is an external view of a stencil printing machine 1 according to the present invention.

In FIG. 1, the case 1 of the stencil printing machine 1
A lid 2 is attached to one side of the upper part of a by a hinge 2a (see FIG. 3) and the like so that it can be opened and closed.
The lid 2 is opened and the stencil sheet S that has been plate-made is set at a predetermined position on the lid 2.

As shown in FIG. 2, the case 1a is provided with an operation panel 5 such as a flat keyboard. The operation panel 5 includes a ten key 5a for setting the number of prints, a print start key 5b, a print stop key 5c,
The print density setting key 5d, the print speed (print speed) setting key 5e, and L for displaying the set number of prints, etc.
It has a display section 5f such as a CD display.

FIG. 3 shows the internal mechanism of the stencil printing machine 1 according to the present invention.

In FIG. 1, the cylindrical plate cylinder 20 is supported by a machine frame (not shown) so as to be rotatable about its own central axis. The plate cylinder 20 has a porous structure, and has a clamp mechanism 21 that detachably engages one end of the stencil sheet S with the plate cylinder 20 on the outer peripheral portion.

One end of the stencil sheet S is locked to the plate cylinder 20 by a clamp mechanism 21 and is wound and mounted on the outer peripheral surface of the plate cylinder 20.

That is, the clamp mechanism 21 includes the plate cylinder 20.
A strip-shaped permanent magnet 22 fixed to the outer peripheral surface of the plate and extending along one generatrix thereof, and a movable clamp piece 24 pivotally supported on the plate cylinder 20 by a shaft 23 extending along the axial direction thereof.
And have. A gear 25 is attached to one end of the shaft 23, and a drive gear 27 supported by one end of a lever 26 is attached to the gear 25 when the plate cylinder 20 is in an initial rotation position (position shown in FIG. 3). Engage appropriately.

The lever 26 is pivotally supported by a frame (not shown) by a pivot 28, is urged in the counterclockwise direction in the figure by the spring force of a spring 30, and when the solenoid 29 is not energized, it is a drive gear. It is located at a pivotal position where 27 is separated from the gear 25. On the other hand, when the solenoid 29 is energized, it rotates clockwise in the figure against the spring force of the spring 30, and the drive gear 2
7 is moved to a rotation position where it meshes with the gear 25 of the plate cylinder 20 in the initial rotation position. The drive gear 27 is rotationally driven by an electric motor 31 attached to the lever 26, and the gear 25 is rotated by this, and the clamp piece 24 moves from the clamp position attracted to the permanent magnet 22 to the clamp position counterclockwise in the figure. It is rotationally driven to and from the unclamp position which is rotated by about 180 ° in the direction.

The plate cylinder 20 is drivingly connected to a sprocket 34a provided coaxially with the central shaft 20c, and the sprocket 3
4a is drivingly connected to a driving sprocket 34b of a motor 33 by an endless chain 32. The plate cylinder 20 is intermittently or continuously rotated by the motor 33 in the counterclockwise direction in the drawing by the power transmission device.

A printing ink supply means 35 is provided in the cylinder of the plate cylinder 20. The printing ink supply means 35 is arranged so as to contact the inner peripheral surface of the plate cylinder 20 on the outer peripheral surface and is rotatable about its own central axis 37.
6 and a doctor rod 38 extending along the roller generatrix direction with a predetermined minute gap with respect to the outer peripheral surface of the squeegee roller 36. The squeegee roller 36 synchronizes with the rotation of the plate cylinder 20. The printing ink in the ink reservoir A is rotated by being driven to rotate in the same direction as the cylinder 20.
Supply to the inner surface of.

The printing ink in the ink reservoir A passes through a minute gap between the squeegee roller 36 and the doctor rod 38 as the squeegee roller 36 rotates, and at that time, the amount of ink is measured and the outer peripheral surface of the squeegee roller 36 is measured. A printing ink layer having a uniform thickness is formed on the surface of the plate cylinder 20. The printing ink layer is carried to the inner peripheral surface of the plate cylinder 20 for rotation as the squeegee roller 36 rotates.

The stencil printing machine 1 is provided with a paper feed table 4 which is vertically movable. A pinion 48, which is rotationally driven by a motor (not shown), is attached to the paper feed table 4,
A rack 49 having a series of rack teeth 49a with which the pinion 48 meshes is fixedly mounted on a machine frame (not shown) in the vertical direction, and the rotation of the pinion 48 causes the paper feed table 4 to move vertically according to the stacking amount of the print paper P. Driven.

The paper feed mechanism 60 has rollers 61, 62, 63 made of rubber or the like, and takes out the printing papers P one by one from the paper feed table 4 and presses the plate cylinder 20 and the press at a predetermined timing. The paper is fed between the roller 40.

The stencil printing machine 1 is provided with a printed paper peeling claw 80. The paper peeling claw 80 is for peeling the printed paper from the plate cylinder 20, and the peeled printing paper flies to the lower right side in the figure by the inertial force given by the rotation of the plate cylinder 20, Sequentially stacked on the output tray 3,
The paper is ejected.

Stencil setting plate 10 for setting stencil base paper S
0 is an optical sensor 101 for detecting the presence or absence of the stencil sheet S.
And the stencil sheet S is a stencil sheet setting plate 10
When it is detected that it is set above 0, the feed roller 10
The stencil sheet S is guided to the transport path 107 by the sheets 2 and 103 and is transported to the clamp mechanism 21 of the plate cylinder 20.

The stencil printing machine 1 has a used stencil base paper S.
A plate discharge mechanism 70 for removing the sheet from the plate cylinder is provided.

In the stencil printing machine 1, the printing paper P is printed on the plate cylinder 20.
Press roller 40 and press roller 40 to be pressed against
A press roller driving device 400 is provided for driving the printing plate in synchronization with the rotation of the plate cylinder 20.

FIG. 4 is a detailed embodiment of the press roller driving device 400.

A cam 41, which rotates integrally with the plate cylinder 20, is attached to the central shaft 20c of the plate cylinder 20.
1, a cam follower lever 42, one end of which is pivotally supported by a machine frame (not shown) by a shaft 42a, is engaged.
The cam follower lever 42 is urged downward in FIG. 4 by a spring (not shown), and the other end is pivotally connected to the lever element 43 by a shaft 42b.

The lever element 43 is composed of a first lever element 44 directly connected to the cam follower lever 42 by a shaft 42b, and a second lever element 45 provided with a pulse motor 50 and a reduction mechanism 51. .

The first lever element 44 is provided with a sliding groove 44b having a U-shaped cross section on which the second lever element 45 slides, and the lever elements 44, 44 are guided by the sliding groove 44b.
45 are extendable and retractable in the lever length direction. A long hole 46a is formed in the lever element 45, and the lever element 4
Since the engaging terminal 46 attached to the No. 4 engages with the long hole 46a, the maximum expansion and contraction amount of both lever elements 44 and 45 is regulated.

Further, the first lever element 44 is provided with an elongated hole 44a for allowing the central shaft 20c to escape so that the entire lever element 43 can be moved up and down by the rotation of the press cam 41.

A support plate portion 47 is bent at the lower end of the second lever element 45, and the support plate portion 47 is provided with a pulse motor 50 and a speed reduction mechanism 51 for reducing the output of the pulse motor 50. Has been.

The output shaft of the pulse motor 50 has a gear 50a.
Is attached, and a large-diameter gear 52 that constitutes a reduction mechanism 51 together with the gear 50a meshes with the gear 50a. A through hole 52a into which a threaded control rod 53 is screwed is provided at the center of the large diameter gear 52, and the rotation of the pulse motor 50 is decelerated by the meshing of the gear 50a and the large diameter gear 52. The screw engagement converts the axial movement of the control rod 53.

A tension coil spring 54 is provided at one end of the control rod 53.
Of the tension coil spring 54 is locked to the pin 55 fixed to the first lever element 44 at the other end,
The second lever element 45 is biased upward in the figure with respect to the first lever element 44.

The second lever element 45 has a pin 55.
An elongated hole 55a is formed through which is inserted.

One end of the swing lever 56 is connected to the second lever element 45 by a shaft 56b, and the swing lever 56 is pivotally supported at its intermediate portion by a shaft 56a from a machine frame (not shown). There is. A connecting plate 57 and one end of a connecting lever 93 are coaxially fixed to the shaft 56a, and a bracket 59 that rotatably supports the press roller 40 by a rotating shaft 59a is attached to the connecting plate 57 by a connecting member 58.

A damper 96 for damping vibration is fixed to a machine frame (not shown) with a screw 97, and a plunger 91 of the damper 96 is attached to an intermediate portion of the hook lever 92 and the other end of the connecting lever 93 by a shaft 91a. Are rotatably attached.

An engaging portion 92a bent in an L shape is provided at a lower end portion of the hook lever 92, and a projection 56c releasably engaged with the engaging portion 92a is provided at an end portion of the swing lever 56. Is provided. As a result, the swing lever 56 and the connecting lever 93 are selectively drive-coupled with respect to the rotation of the swing lever 56 in the counterclockwise direction in the drawing.

The maximum rotation amount of the connecting lever 93 in the clockwise direction in the figure, in other words, the maximum separation position of the press roller 40 is the adjustment screw 7 screwed to the support member 72.
It is set to be adjustable by 1.

The hook lever 92 is urged by a spring (not shown) in the clockwise direction in the figure, that is, in the direction away from the engagement with the swing lever 56.

A plunger lever 94 is rotatably attached to a machine frame (not shown) by a pivot 94a, and the plunger lever 94 is selectively driven to rotate clockwise by a solenoid 98 in the drawing. The hook lever 92 is moved counterclockwise in the figure, that is, the swing lever 56.
Rotate in the engagement direction with.

As a result, the swinging lever 56 and the connecting lever 93 are drive-connected by the ON operation of the solenoid 98.

In FIG. 4, reference numeral 95 is a monitoring sensor for monitoring the position of the press roller 40.

When the cam 41 is in the rotational position shown in FIG. 4, the lever element 43 is in its overall lower position,
The press roller 40, as shown in FIG.
It is in a separated position apart from zero.

From this state, when the central shaft 20c is rotated 180 degrees counterclockwise in the figure by driving the motor 33, the cam 41 is also moved to 1 as shown in a simplified manner in FIG.
When the lever element 43 is rotated by 80 degrees, the lever element 43 is entirely moved upward, and the swing lever 56 is rotated about the shaft 56a in the counterclockwise direction in the drawing.

At this time, the solenoid 98 is pulled, and the engaging portion 92a of the hook lever 92 and the protrusion 56c of the lever 56.
When the and are engaged, the rotation of the rocking lever 56 is transmitted to the connecting lever 93 via the hook lever 92, whereby the shaft 56a is rotated counterclockwise in the figure,
The press roller 40 moves in a direction in which it comes into pressure contact with the outer peripheral surface of the plate cylinder 20, that is, to a press action position, and brings the fed printing paper into pressure contact with the outer peripheral surface of the plate cylinder 20 to perform stencil printing in a pressing manner.

At this time, the movement of the press roller 40 to the pressing position is performed by pulling up the first lever element 44, and this movement gives a tension force to the tension coil spring 54, while the second movement is performed.
Is transmitted to the lever element 45 of the
It is performed by rotating counterclockwise in FIG. 4 about a. The press roller 40 is pressed against the outer peripheral surface of the plate cylinder 20 with the printing paper P sandwiched therebetween, and the counterclockwise rotation in FIG. 4 about the shaft 56a of the swing lever 56 is restricted. Still more pulling up of the first lever element 44 causes the first lever element 44 to displace with respect to the second lever element 45 and the tension coil spring 54 to expand. As a result, the press roller 4 is pressed by the spring force due to the expansion of the tension coil spring 54.
0 is pressed against the outer peripheral surface of the plate cylinder 37 with the printing paper P sandwiched therebetween, whereby the press pressure, that is, the pressure contact force is determined by this spring force.

When adjusting the press pressure (pressure contact force), the pulse motor 50 is driven to rotate the large diameter gear 52, and the axial position of the second lever element 45 of the control rod 53 is changed. As a result, the attachment length of the tension coil spring 54 changes, and the attachment load of the tension coil spring 54 changes accordingly.

Due to the change in the mounting load of the tension coil spring 54, the pressure for pressing the press roller 40 against the outer peripheral surface of the plate cylinder 20 under the above-described action, that is, the press pressure changes.

The pulse motor 50 is driven according to the printing speed set by the printing speed setting key 5e in order to adjust the pressure contact force of the press roller 40, and the press pressure is automatically adjusted according to the set printing speed. To fix.

By driving the motor 33, the center shaft 20c is further rotated counterclockwise by 180 degrees from the state shown in FIG.
When rotated once, the state returns to the state shown in FIG.
The press contact and separation operation of the press roller 40 with respect to the plate cylinder 20 is repeated in synchronism with the rotation.

When the print paper P is not fed, the solenoid 98 is released from the ON operation, the hook lever 92 is disengaged from the swing lever 56, and the swing lever 56 and the connecting lever 93 are released. By removing the connection with
Regardless of the rotation of the cam 41, the press roller 40 is always the plate cylinder 2
It is held at a separated position apart from zero.

FIG. 6 shows the electrical components of the stencil printing machine 1 as described above.

In the figure, reference numeral 200 indicates a CPU 200 composed of a microprocessor or the like, and the CPU 200 includes a ROM 210 storing a program for controlling each mechanism in the apparatus, an operation panel 5, Temperature sensor 104 for detecting the temperature of printing ink
And a usage status detection mechanism 105 for detecting the usage status of the apparatus, such as whether or not the printing has just started, and the unused period (non-use period) since the previous usage, a monitoring sensor 95, a solenoid 98, and a stencil sheet. Optical sensor 10 for detecting the presence or absence of S
1, an optical sensor 90 for detecting that the stencil sheet S has been conveyed to a position where it can be clamped, and a plate cylinder drive motor 33 that constitutes a plate cylinder drive unit for rotating the plate cylinder 20 in divided or continuous rotations. , A feed roller driving motor 60M,
Conveyor roller driving motor 102M for conveying the stencil sheet S
An electric drive unit of the clamp mechanism 21, an electric drive unit of a plate discharge mechanism (stencil sheet removing mechanism) 70, a pulse motor 50, and a pulse for supplying the pulse motor 50 with a number of pulses corresponding to print density information. The calculation result of the generation starter 50A and the microprocessor is temporarily stored, or the number of prints setting information input from the ten key 5a of the operation panel 5, the print speed information set by the print speed setting key 5d, and the temperature sensor 104 are detected. RAM 22 that stores the ink temperature information, the usage status information such as the non-use period detected by the usage status detection mechanism 105, and the print density information set by the print density setting key 5e as needed.
0 and 0 are connected to each other.

Next, the main part of the present invention will be described with reference to the flowchart shown in FIG.

The stencil sheet S (original) is the stencil sheet setting plate 1
When it is set on 00, the fact is detected by the optical sensor 101 (Yes at Step 501), and the number of prints setting information is set by the ten keys 5a of the operation panel 5, and the printing speed is set by the printing speed setting key 5d and the printing density setting key 5e. When the print density information is input and set, each setting information is stored in each area of the RAM 220 (steps 502, 503, 504) and is set as one of the print processing conditions.

When the predetermined print processing information is set in this way, the temperature of the printing ink at present and the non-use period from the last use of the stencil printing apparatus 1 by the temperature sensor 104 and the use state detection mechanism 105, or the stencil printing Usage state information of the stencil printing apparatus 1 including discrimination information indicating whether the printing apparatus 1 is about to be used or has already printed some sheets is stored in each area of the RAM 220 ( Step 505).

Next, when the print start key 5b is pressed (Yes at step 506), the clamp mechanism 21 is operated based on a command from the CPU 200, is used for the previous printing, and is wound around the outer periphery of the plate cylinder 20. Stencil base paper S
Is released from the clamped state, and is then peeled off from the outer peripheral surface of the plate cylinder 20 by the plate discharging mechanism 70 and discarded in a plate discharging box (not shown) (step 507).

Then, the transport roller driving motor 102M is driven by a command from the CPU 200, whereby the feed roller 102 is rotationally driven, and the stencil sheet S is transported to the clamp mechanism 21. When the leading end of the stencil sheet S reaches the clamp mechanism 21, the optical sensor 90 detects that fact, and when the detection signal is transmitted to the CPU 200, CP
The U200 sends a command to the clamp mechanism 21 to clamp the front end of the stencil sheet S. As a result, the stencil sheet S
The tip of the is clamped by the clamp mechanism 21.

In response to a command from the CPU 200, the plate cylinder driving motor 33 is driven, the plate cylinder 20 is rotated once counterclockwise in the drawing, and the stencil sheet S is formed on the outer peripheral surface of the plate cylinder 20.
Are wound and mounted (step 508).

In the next step 509, the RAM 2
The printing process is performed based on the printing ink temperature information and the usage status information of the stencil printing apparatus 1 together with the print number setting information, the print speed setting information, and the print density setting information stored in 20.

That is, in this printing process, the plate cylinder drive motor 33 for rotating the plate cylinder 20 is a RAM.
The printing is controlled based on the printing speed setting information stored in 220, and the printing process is executed according to the printing speed, the printing ink temperature, and the printing density set according to the usage state of the stencil printing machine 1. Laura 4
The pressure contact force of 0 (press pressure) is controlled.

That is, the CPU 200 comprehensively judges the printing speed, the printing ink temperature, and the usage state of the stencil printing apparatus 1 so as to satisfy the printing density of the printing density setting information stored in the RAM 220, and the pulse is generated by this. The device 50A is controlled to determine the number of pulses to be supplied to the pulse motor 50.

Therefore, the print density setting key 5d shown in FIG.
If the print density is set in the dark direction by, the number of pulses supplied to the pulse motor 50 correspondingly increases, and as a result, the pressure contact force of the press roller 40 to the plate cylinder 20 increases and the print density increases. Grows larger.

On the other hand, when the print density is set to be low, the number of pulses supplied to the pulse motor 50 becomes small, and as a result, the pressure contact force of the press roller 40 to the plate cylinder 20 becomes small.

Based on the information stored in the RAM 220 as described above, the plate cylinder 20 and the press roller 40 are driven, and the paper feed mechanism 60 and the squeegee roller 36 are operated to perform printing (step 509).

In this case, the ink circumference is different at the time of the first printing and after printing several sheets, and the usage state of the stencil printing machine 1 is different. Therefore, during printing, the number of pulses supplied to the pulse motor 50 is appropriately controlled so as to satisfy the set print density while sequentially fetching the information input from the usage state detection mechanism 105.

Next, the CPU 220 determines whether or not the number of prints has reached the set number of prints. Here, when the number of prints reaches the set number of prints (step 510).
Affirmative), the printing process ends. On the other hand, if the number of prints has not reached the set number of prints (step 510).
If the print density has not been changed by the operation of the print density setting key 5d of the operation panel 5, the CPU 200 first determines whether the print density has not been changed (No in step 511), and the previous print is performed. The next printing process is executed under the conditions (step 509).

On the other hand, if the print density has been changed (Yes at step 511), the print density setting information stored in the RAM 220 is changed to the changed print density setting information (step 512). Therefore, in the subsequent printing process, when the press roller 40 is driven and pressed against the plate cylinder 20, the pulse generator 50A drives the pulse motor 50
The number of pulses supplied to is changed according to the changed print density setting information.

After that, each time the print density is changed by operating the print density setting key 5d, the above-mentioned processing is performed, and the number of pulses supplied to the pulse motor 50 is changed, whereby the plate cylinder 20 of the press roller 40 is changed. The pressure contact force of is changed.

That is, the printing density on the printing paper P is changed by changing the pressure contact force of the press roller 40 to the plate cylinder 20.

In this embodiment, as described above, not only the printing speed but also the temperature of the printing ink, the stencil printing machine 1
The print processing is performed at a desired print density in consideration of the usage status information of the above. Therefore, fine density control is automatically performed according to the outside air temperature and the usage state of the stencil printing apparatus 1.

In this embodiment, the temperature of the printing ink and the usage status information of the stencil printing apparatus 1 are automatically input to the apparatus by microcomputer control. It can also be configured to be input by operating the ten-key 5a.

Further, in this embodiment, the driving device 400 for the press roller 40 is constituted by the cam and the link mechanism, but as the driving source, a motor different from the plate cylinder driving motor 33 or a solenoid is used. Of course, in this case, the hook lever 92 or the like is not necessary, and the structure can be simple.

Furthermore, although a cylindrical press roller is used in this embodiment, it is of course possible to carry out the present invention with respect to the deformed press roller proposed in Japanese Patent Laid-Open No. 63-73987.

[0076]

As is apparent from the above description, in the stencil printing apparatus according to the present invention, the press roller is pressed against the plate cylinder in accordance with the printing speed information set by the printing speed information setting means such as the printing speed setting key. Since the force is automatically and variably set, the print density is automatically compensated for the print speed, and stencil printing with a desired density can be easily performed regardless of the change in the print speed.

[Brief description of drawings]

FIG. 1 is an external view of a stencil printing machine according to the present invention.

FIG. 2 is an explanatory view showing an operation panel of the stencil printing machine according to the present invention.

FIG. 3 is an overall schematic diagram showing an internal mechanism of a stencil printing apparatus according to the present invention.

FIG. 4 is a front view showing a detailed embodiment of a press rocking device used in the stencil printing machine according to the present invention.

FIG. 5 is a schematic view showing a state in which a press roller is located at a press working position.

FIG. 6 is a block diagram showing an electrical configuration of a stencil printing machine according to the present invention.

FIG. 7 is a flowchart showing the overall operation of the stencil printing machine according to the present invention.

[Explanation of symbols]

 1 Stencil printing device 5 Operation panel 5d Printing density setting key 20 Plate cylinder 40 Press roller S Stencil sheet 104 Temperature sensor 105 Use state detection mechanism 400 Press rocking device

Claims (1)

[Claims] 1. A printing speed information setting means for setting printing speed information in a stencil printing apparatus for printing by pressing a printing paper onto a stencil sheet wrapped around the outer circumference of a cylindrical plate cylinder by a press roller, A stencil printing apparatus comprising: a press contact force variable setting unit that variably sets a press contact force of the press roller with respect to the plate cylinder according to the print speed information set by the print speed information setting unit.