JP2001105710A - Stencil printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the rear end part of stencil paper wound on a printing drum from being stained with ink. SOLUTION: A screen member 15 having ink permeability is fitted to one end part of a first form seat 5 connecting a pair of disk-shaped members 4. The screen member is wound on the disk-shaped members, while a second form seat 16 fitted to the other end part is fitted to the first form seat by the medium of a spring 17. The first form seat is provided with a first clamping plate 13 holding the fore end part of stencil paper, while the second form seat 16 is provided with a second clamping plate 21 holding the rear end part of the stencil paper. The fore and rear end parts of the stencil paper wound on the screen member are held by the first and second clamping plates. The rear end part of the stencil paper wound on a printing drum is prevented from flying up. The rear end part does not come into contact with another component and is prevented from being stained with ink or the like. Printing paper is not stained either and a clear printed image is 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 machine provided with a cylindrical printing drum which is formed by stencil stencil winding around an outer peripheral surface and driven to rotate.

[0002]

2. Description of the Related Art FIG. 10 is a sectional view showing a basic structure of a conventional stencil printing apparatus. This stencil printing machine has a printing drum 100. The printing drum 100 includes a pair of disk-shaped members 101 coaxially arranged on a common central axis.
And a plate 102 for connecting the pair of disc-shaped members 101
Having a base 103 made of. A gear 104 is fixed to the base 103 coaxially with the central axis. This gear 1
A drive gear (not shown) is meshed with 04. By the rotation of the driving gear, the base 103 is driven to rotate about the central axis.

An ink-permeable and flexible ink-permeable member 105 is wound around a base 103. One end of the ink passage member 105 is fixed to the plate 102 of the base 103. The ink-permeable member 105 is a disc-shaped member 10
1 is wound around the outer peripheral surface. Ink-permeable member 1
The other end of 05 is elastically attached to the plate seat 102 by a spring 106. Therefore, the ink-permeable member 1
05 is elastically deformed outward when pressed from the inside. The plate seat 102 is provided with a clamping means 107. The perforated stencil sheet is fixed at its leading end to the plate seat 102 by clamping means 107 and wound around the outer peripheral surface of the ink-permeable member 105.

A squeegee roller 110 is provided inside the print drum 103 so as to be able to move up and down. The squeegee roller 110 moves up and down at a predetermined timing in synchronization with the rotation of the printing drum 103, and presses the ink-permeable member 105 outward. The squeegee roller 110 is used for the printing drum 1.
The driving gear 104, the intermediate gear 111, and the gear 112 of the squeegee roller 110 are rotated in the same direction as the printing drum 100 in conjunction with the printing drum 100. The ink is supplied to the printing drum 1 via the ink supply pipe 113.
A fixed amount is supplied to the peripheral surface of the squeegee roller 110 by the doctor roller 114 which is supplied into the inside of the squeegee roller 103 and arranged at a predetermined interval with respect to the squeegee roller 110.

Although not shown, a paper cylinder having substantially the same diameter as the printing drum 100 is disposed below the printing drum 100. The axis of rotation of the paper cylinder and the central axis of the printing drum 100 are parallel. In the non-printing state, a minute gap is provided between the printing drum 100 and the paper cylinder. The paper cylinder is rotationally driven in a direction opposite to the printing drum 100 in synchronization with the rotation of the printing drum 100. Printing paper is supplied between the printing drum 100 and the paper cylinder. At a predetermined timing, the squeegee roller 110 descends and presses the ink-permeable member 105 outward. The ink-permeable member 105 and the stencil sheet deformed outward sandwich the printing paper between the paper cylinder. The printing paper is transported between the deformed printing drum 100 and the paper cylinder. During transport, the ink-permeable member 105
Supplied to the inner peripheral surface of the ink-permeable member 10
5 and passes through the perforated portion of the stencil sheet to transfer to printing paper to form an image.

An image of a document to be printed is read by the image reading device 200 and sent to the plate making section 300 as an image signal.

The plate making section 300 has a platen roller 301 and a thermal head 302. The roll-shaped stencil sheet 1 is conveyed while being sandwiched between a platen roller 301 and a thermal head 302. During transport, the thermal head 30
2 is driven by an image signal from the image reading device 200 to generate heat and form a perforated image on the stencil sheet 1. The stencil sheet 1 on which the perforated image is formed is a platen roller 301.
Is sent to the vicinity of the printing drum 100 by the feed roller 303. The leading end of the stencil sheet 1 is clamped by the clamping means 107.
Thus, the printing drum 100 is wound around the outer peripheral surface by rotating counterclockwise in the figure.
The stencil sheet 1 is cut by the cutter 304 when a predetermined dimension of one plate has been wound around the printing drum 100.
This cut portion opposite to the leading end of the stencil sheet 1 fixed to the clamping means 107 is the rear end of the stencil sheet 1.

After that, printing is performed. After printing, the used stencil sheet 1 is peeled off from the printing drum 100 and discarded. With the clamping means 107 opened, the printing drum 10
Rotate 0. The leading end of the stencil sheet 1 released from the clamping means 107 is sandwiched between a pair of plate discharge rollers 401 and is accumulated in a plate discharge section 400 including a plate discharge box and the like by driving the plate discharge rollers 401. At the time of this plate discharging, the ink remaining on the stencil sheet 1 to be discarded is discharged from the plate discharging roller 401.
Adheres to

[0009]

When plate making and printing are performed based on a new image in the above state, the feed roller 303 is used.
Print stencil sheet 1 sent from
When printing is performed by wrapping around the sheet discharging roller 40, the rear end not fixed to the clamping means 107 rises.
In some cases, the ink came into contact with 1 and the like, causing the ink to adhere.
The ink adhering to the rear end of the stencil sheet 1 is transferred to the printing member and causes problems such as soiling of the printing paper.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the rear end of a stencil sheet from being stained with ink, and to prevent the ink from adhering to a printing sheet and being stained.

[0011]

The stencil printing apparatus according to the present invention is characterized in that a stencil printing machine (1) is provided with a stencil sheet (1) wound around an outer peripheral surface and rotated around its own central axis. )
First holding means (10) provided on the outer peripheral surface of the printing drum for holding the leading end of the stencil paper, and second holding means provided on the outer peripheral surface of the printing drum for holding the rear end of the stencil paper Means (18).

A stencil printing apparatus according to a second aspect of the present invention is the stencil printing apparatus according to the first aspect, wherein the stencil printing apparatus is provided at a predetermined position near the printing drum, and is wound around the outer peripheral surface of the printing drum. A fan (32) for blowing air to the rear end to move the rear end of the stencil sheet (1) toward the outer peripheral surface so that the second holding means (18) can hold the rear end between the stencil paper and the printing drum. It is characterized by having.

According to a third aspect of the present invention, in the stencil printing apparatus of the first aspect, the stencil printing apparatus is movably provided at a predetermined position near the printing drum (2), and is provided on an outer peripheral surface of the printing drum. A pressure member (pressure roller 60) for pressing the rear end to the outer peripheral surface so that the second holding means (18) can hold the rear end of the wound stencil paper (1) between the second holding means (18) and the printing drum. It is characterized by having.

According to a fourth aspect of the present invention, there is provided a stencil printing apparatus comprising: a pair of disk members (4) coaxially disposed on a common center axis; and a first base member for connecting the pair of disk members. A substrate (3) having a material (first plate seat 5) and rotating about the central axis. In addition, there is provided an ink-permeable ink-permeable member (15) that has one end attached to the base and is wound around the pair of disk-shaped members and forms a peripheral surface for attaching the stencil sheet (1). are doing. Further, a second base material (second plate 16) attached to the other end of the ink-permeable member, and the ink-permeable member are wound around the pair of disk-shaped members with a predetermined force. An elastic member (spring 17) for elastically connecting the second base member to the base member, a first holding means (10) provided on the base member for holding the leading end of the stencil sheet 1, A second holding means (18) provided on the second base material for holding the rear end of the stencil sheet 1;

0

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stencil printing apparatus according to an embodiment of the present invention will be described below with reference to FIGS.
In this example, a printing unit mainly including a printing drum and a paper cylinder will be described. The paper feeding means, paper discharging means, plate making means, plate discharging means, document reading means and the like of the stencil printing apparatus of this embodiment are the same as those of the conventional apparatus shown in FIG.

The structure of the printing drum 2 will be described with reference to FIGS. The printing drum 2 has a base 3. The base 3 includes a pair of disk-shaped members 4 coaxially arranged on a common center axis, and a first plate seat 5 as a base material connecting the pair of disk-shaped members 4. The longitudinal direction of the first plate 5 is parallel to the central axis of the disk-shaped member 4.

As shown in FIG. 2 and FIG.
The driven gears 6 are coaxially fixed to the outer end surfaces of the driven gears 6, respectively. A drive shaft 7 that is linked to a drive source (not shown) is disposed near the base 3. The drive shaft 7 is parallel to the central axis of the disk-shaped member 4, and drive gears 8 are fixed to both ends thereof. The drive gear 8 meshes with the driven gear 6. When a drive source (not shown) is driven, the drive shaft 7 rotates, the drive gear 8 rotates the driven gear 6, and the base 3 is driven to rotate around the central axis.

The first plate 5 is provided with a first holding means 10. The first holding means 10 includes a plurality of rotation fulcrums 11 fixed to the first plate 5, a rotation shaft 12 rotatably supported by the rotation fulcrum 11, and a metal second support attached to the rotation shaft 12. It has one clamp plate 13. The rotation axis is the base 3
Is parallel to the central axis of. As shown in FIG.
A first connection plate 14 is provided at one end of the second connection plate 2. First
The connecting plate 14 is detachably connected to a driving mechanism described later.

One end of the ink-permeable member 15 is attached to one end of the first plate 5. One end of the ink-permeable member 15 is on the upstream side in the rotation direction of the printing drum 2. The ink-permeable member 15 is made of a flexible material that is at least partially permeable to ink.
The ink-permeable member 15 is wound around the base 3 in the rotation direction such that a pair of side edges thereof are in sliding contact with the peripheral surfaces of the pair of disc-shaped members 4. Ink-permeable member 1
A second plate seat 16 that is elongated in the axial direction is fixed to the other end of the fifth plate 5. The other end of the ink-permeable member 15 is on the downstream side in the rotation direction of the printing drum 2. This second
The plate seat 16 is connected to the first plate via a spring 17 which is an elastic member.
It is attached to the other end of the plate 5. As shown in FIG. 1, a part of the second printing plate 16 overlaps a part of the first printing plate 5,
They are slidably overlapped. As described above, the ink-permeable member 15 is pulled to the downstream side in the rotation direction by the elastic force of the spring 16, and is wound around the pair of disc-shaped members 4. Therefore, the ink-permeable member 15 is cylindrical as a whole. When the ink-permeable member 15 is pressed from the inside, it slides on the peripheral surface of the disk-shaped member 4 and bulges outward.

The second plate seat 16 is provided with a second holding means 18. The second holding means 18 includes a plurality of rotation fulcrums 19 fixed to the second plate seat 16, a rotation shaft 20 rotatably supported by the rotation fulcrum 19, and a metal second shaft attached to the rotation shaft 20. It has two clamp plates 21. Rotating shaft 20
Is parallel to the central axis of the base 3. As shown in FIG.
A second connecting plate 22 is provided at one end of the rotating shaft 21. The second connecting plate 22 is detachably connected to a driving unit described later.

The first clamp plate 13 is fixed to the first plate seat 5 at a position where the first clamp plate 13 is tilted toward one end of the ink-permeable member 15 as shown in FIG. A magnet is arranged at the position of the first plate 5. At this position, the first clamp plate 13 magnetically attaches the leading end of the stencil sheet 1 on the ink-permeable member 15.

As shown in FIG. 2, the second clamp plate is located at the position where the second plate 1 is tilted toward the other end of the ink-permeable member 15.
Fixed to 6. A magnet is arranged at the position of the second printing plate 16. At this position, the second clamp plate 21 magnetically attaches the rear end of the stencil sheet 1 on the ink-permeable member 15. A magnet is also arranged in one area of the second plate seat 16 located between the two rotation shafts 12 and 20. First
When the clamp plate 13 and the second clamp plate 21 are in an open state in which the stencil sheet 1 is not held, the clamp plate 13 and the second clamp plate 21 are magnetically attached and overlap with this area.

As shown in FIG. 2, a clamp driving means 25 for driving the first and second holding means 10 and 18 is provided at a predetermined position near the printing drum 2. The clamp driving means 25 includes a substrate 26, a first clamp motor 27 and a second clamp motor 2 attached to the substrate 26.
8 and first and second rotating shafts 29 and 30 driven by the respective motors. Then, the clamp driving means 25
Has moving means for moving the substrate 26 in parallel with the central axis of the printing drum 2. The first and second rotating shafts 29,
Reference numeral 30 denotes a position corresponding to the first and second connecting plates 14 and 22, respectively, when the printing drum 2 is set to the mounting start position or the mounting completion position of the stencil sheet 1. When the printing drum 2 is at such a position, the substrate 26 moves in the moving direction indicated by the arrow in FIG.
4, 22 respectively. Here the clamp motor 2
When the plates 7 and 28 are driven, the clamp plates 13 and 21 rotate.

As shown in FIG. 4, a fan 32 is provided near the printing drum 2 as a blower. The fan 32 holds the rear end of the stencil sheet 1 lifted at the second end.
It functions as a means for moving it on the plate 16.
The position of the fan 32 is slightly behind the rotation direction of the second holding means 18 when the printing drum 2 is set to the position where the stencil sheet 1 is completely mounted. That is, as shown in FIG. 4, when winding of the stencil sheet 1 with the rotation of the printing drum 2 is completed, the second end of the stencil sheet 1 that is not held is sandwiched by the second end.
The clamp plate 21 and the fan 32 face each other. Here, if the fan 32 is operated, the rear end of the stencil sheet 1 can be moved by the wind and pressed onto the second plate 16. By operating the second clamp plate 21 in the closing direction, the rear end of the stencil sheet 1 can be held between the second clamp plate 21 and the second plate seat 16.

As shown in FIG. 5, a squeegee roller 40 is provided inside the printing drum 2. The squeegee roller 40 is provided on a swinging member (not shown), and can move up and down inside the printing drum 2. The squeegee roller 40 includes a drive gear 41 provided coaxially with the printing drum 2.
The intermediate gear 42 and the gear 43 of the squeegee roller 40 are driven to rotate in the same direction as the print drum 2 in conjunction with the print drum 2. Further, the squeegee roller 40 presses the ink-permeable member 15 outward at a predetermined timing in synchronization with the rotation of the printing drum 2. The ink is supplied into the print drum 2 via the ink supply pipe 44, and a predetermined amount is supplied to the peripheral surface of the squeegee roller 40 by the doctor roller 45 arranged at a predetermined interval with respect to the squeegee roller 40. .

As shown in FIG. 5, a paper cylinder 50 is arranged below the printing drum 2. The diameter of the paper cylinder 50 is substantially the same as the diameter of the printing drum 2. In the non-printing state, a minute gap is provided between the printing drum 2 and the paper cylinder 50. The paper cylinder 50 is rotationally driven in a direction opposite to the printing drum 2 in synchronization with the rotation of the printing drum 2. A holding claw 51 for holding the leading edge of the printing paper is provided on the outer peripheral surface of the paper cylinder 50 so as to be openable and closable. In order to avoid interference with the first and second holding means 10 and 18, a concave portion 5 is provided on the outer peripheral surface of the paper cylinder 50.
2 are provided.

The operation of the present apparatus will be described. When the printing is completed, the clamp driving unit 25 moves the first and second holding units 1.
0, 18 and the first and second clamp plates 13, 2
1 is opened. The second clamp plate 21 is opened and magnetically attached to the open position, and then the first clamp plate 13 is opened and magnetically attached to the second clamp plate 21 in the open position. Here, the clamp driving unit 25 is retracted from the printing drum 2 and
Rotates. The leading end of the used stencil sheet 1 is taken into the stencil discharging means. With the rotation of the printing drum 2, the stencil sheet 1 is peeled off from the printing drum 2 and stored in the stencil discharging means.

The printing drum 2 is set at a mounting start position of a new stencil sheet 1 shown in FIG. As shown in FIG. 2, the first and second clamp motors 27 and 28 approach the printing drum 2 by operating the clamp driving means 25, and the first and second clamp motors
The rotation shafts 29 and 30 are respectively connected to the first and second connection plates 14 and
22. The stencil sheet 1 perforated by the stencil making means is sent to the printing drum 2 via the feed roller 303 as shown in FIG. Next, the first clamp motor 27 is rotated clockwise in FIG.
Close 3. The leading end of the stencil sheet 1 is held between the first plate seat 5 and the first clamp plate 13.

The clamp driving means 25 retreats to the standby position. The printing drum 2 rotates counterclockwise in FIG. 1 in a state where the leading end of the stencil sheet 1 is sandwiched by the first clamp plate 13. The stencil sheet 1 is wound around the outer peripheral surface of the ink-permeable member 15. The stencil sheet 1 is cut by a cutter into a length corresponding to one specified plate.

The printing drum 2 stops after one rotation,
The mounting start position is set again. The clamp driving means 25 operates again, and the first and second rotating shafts 29, 30 are connected to the first and second connecting plates 14, 22, respectively. As shown in FIG. 4, the fan 32 blows the rear end of the stencil sheet 1 in this state. The rear end of the stencil sheet 1 is pressed against the second plate 16 by wind. In this state, the second clamp motor 28 rotates the second rotating shaft 30 counterclockwise in FIG. 4 to close the second clamp plate 21. The rear end of the stencil sheet 1 is held between the second plate seat 16 and the second clamp plate 21. After the clamp driving unit 25 has retreated to the standby position, printing on newly printed plates is started. When the stencil sheet 1 and the ink-permeable member 15 move toward the paper cylinder 50 during printing, the stencil sheet 1 is pulled.
Since the stencil sheet 7 is elongated, no excessive force is generated on the stencil sheet 1.

According to this embodiment, since the rear end of the stencil sheet 1 is held by the second holding means 18, the rear end of the stencil sheet 1 is not stained by the ink attached to the stencil discharging means.

In this embodiment, the printing drum 2 in which a flexible ink-permeable member 15 is wound around the base 3 and fixed by a spring 17
And a paper cylinder 50 having substantially the same outer shape as the printing drum 2. At the time of printing, the ink-permeable member 15 is extruded by the squeegee roller 40 to be deformed outward, and
The ink passing member 15 is provided on the printing paper which is held and conveyed.
Printing is performed by pressing the stencil sheet 1 above. In the stencil printing apparatus having such a structure, when the surface speed X of the stencil sheet 1 on the printing drum 2 is higher than the surface speed Y of the paper cylinder 50, the stencil sheet 1 is elongated and a perforated image is deformed. Absent. However, when the surface speed Y of the paper cylinder 50 is higher than the surface speed X of the stencil sheet 1 on the printing drum 2, the stencil sheet 1 shifts upstream.

According to this embodiment, the surface speed Y of the paper cylinder 50 is slightly higher than the surface speed X of the stencil sheet 1 on the printing drum 2 so that the stencil sheet 1 does not stretch. Even in this case, the leading end and the trailing end of the stencil sheet 1 are fixed by the first holding means 10 and the second holding means 18, respectively. Few.

In the stencil printing machine of this embodiment, the flexible cylindrical ink-permeable member 15 is pushed out and deformed outward.
Printing is performed with the printing paper interposed between the paper cylinder 50. In the device having such a structure, since the ink-permeable member 15 is elastically wound around the disk-shaped member 4, the second holding means 1 is provided.
Reference numeral 8 denotes a second plate 16 fixed to the other end of the ink-permeable member 15. However, the present invention also relates to a stencil printing apparatus having a rigid cylindrical printing drum 2 around which a stencil sheet is wound, and a pressing roller provided below the printing drum 2 so as to be able to move up and down and pressing a printing sheet against the stencil sheet. Applicable. In this case, two holding means for holding the leading end and the trailing end of the stencil sheet may be provided at fixed positions on the outer peripheral surface of the printing drum.

FIG. 6 shows another example of the structure of the second clamp plate 21. A projection 55 is provided on the lower surface of the second clamp plate 21. The upper surface of the second plate 16 is provided with a concave portion 56 with which the projection 55 of the second clamp plate 21 is engaged. Accordingly, when the stencil sheet 1 is sandwiched between the second clamp plate 21 and the second stencil sheet 16, the stencil sheet 1 becomes the projection 55 and the concave portion 56.
And is securely fixed. Therefore, the stencil sheet 1 can be given a certain tension and fixed in another state. In this example, since the projection 55 has a smooth spherical shape, the stencil sheet 1 is not easily damaged.

FIG. 7 shows a second example of the present invention. The clamp driving means 25 of the first example is provided with a first clamp motor 27 for opening and closing the first and second clamp plates 13 and 21.
And the second clamp motor 28. Although not shown in detail, the clamp driving means of the second example has one clamp motor and one rotation shaft.

In the second example, in addition to the fan 32, a pressure roller 60 as a pressure member for pressing the rear end of the stencil sheet 1 against the surface of the second plate 16 is provided.
The pressure roller 60 is rotatably attached to one end of an extendable arm 61. The other end of the arm 61 is a guide 6
2 can be moved. The arm 61 can be moved along a guide 62 by a driving device (not shown). The arm 61 is provided with an arm spring 63,
The pressure roller 60 can be pressed against the printing drum 2 with a uniform pressure. Other structures are the same as those of the first example.

The printing drum 2 is set at the position where the stencil sheet 1 is mounted. Clamp driving means moves the clamp motor toward the printing drum 2. The rotation axis is the first clamp plate 1
3 is connected to the first connecting plate 14. The first clamp plate 13 is opened by operating the clamp motor. Also in this example, as in the example shown in FIG. 1, the stencil sheet 1 on which an image has been perforated by the stencil making unit is sent to the printing drum 2 via the feed roller 303. The leading end of the stencil sheet 1 is the printing drum 2
The first clamp plate 13 is closed. Thereafter, the clamp driving means is retracted to the standby position. The printing drum 2 rotates counterclockwise while the leading end of the stencil sheet 1 is held between the first clamp plates 13. The stencil sheet 1 is wound around a printing drum 2 and cut by a cutter. The printing drum 2 stops at a position where the second connecting plate 22 of the second clamp plate 21 is aligned with the rotation axis.

Here, the clamp driving means moves toward the printing drum 2 so that the rotating shaft and the second connecting plate 22 fit together. The clamp motor is driven, and the second clamp plate 21 rotates counterclockwise in FIG. When rotated to the state shown in FIG. 7, the pressure roller 60 moves toward the printing drum 2 and presses the stencil sheet 1 against the printing drum 2. The rear end of the stencil sheet 1 moves to a position above the second plate 16. At this time, the fan 32 is also operated to help the rear end of the stencil sheet 1 to move to a position above the second plate 16. Here, the clamp motor is driven. Second clamp plate 2
Reference numeral 1 sandwiches and fixes the rear end of the stencil sheet 1 with the second printing plate 16.

In the above embodiment, a pressure roller 6 is used as a member for pressing the stencil sheet 1 against the surface of the printing drum 2 with a constant force.
Although 0 is used, a roller may be used as long as the shape does not damage the stencil sheet 1. For example, a non-roller-shaped pressing member made of metal, resin, or the like may be used.

Further, in the present embodiment, the second clamp plate 21
Alternatively, an adhesive area having a certain adhesiveness may be provided on the surface of the second plate 16 as the second holding means. In this way, the pressure roller 60 moves onto the second printing plate 16 while pressing the stencil sheet 1, and thereby the stencil sheet 1 is moved.
Is fixed to the second plate 16 in close contact. The adhesiveness of the adhesive region of the second stencil 16 is preferably such that the stencil sheet 1 is quickly peeled off when discarded.

FIGS. 8 and 9 show modified examples of the second holding means 18 and the second plate 16. The second plate 16 has a rocking plate 70
Is provided. The swing plate 70 moves like a seesaw in the circumferential direction of the print drum 2 with one point serving as a fulcrum. As shown in FIG. 8, the swing plate 70 is
When the second clamp shaft 21 'is closed, the side close to the second rotary shaft 20 is pushed down when the second clamp plate 21' is closed, as shown in FIG.
The far side rises.

Therefore, when the rear end of the stencil sheet 1 is held between the second clamp plate 21 'and the rocking plate 70, it is lifted by the end of the rocking plate 70, and a certain tension is applied. State. In addition, the shape of the second clamp plate 21 ′ is configured to have the same inclination as the inclined swing plate 70.

[0044]

According to the present invention, the printing drum around which the stencil sheet is wound is provided with two holding means for holding the leading end and the rear end of the stencil sheet. For this reason, the rear end of the stencil wrapped around the printing drum does not rise. Therefore, the rear end of the stencil sheet wound on the printing drum does not contact other parts near the printing drum, and is not contaminated with ink or the like.
Therefore, a clear print image can be obtained without soiling the printing paper.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is a half part of a plan view showing the first example.

FIG. 3 is another half of a plan view showing the first example.

FIG. 4 is a sectional view showing an operation of the fan in the first example.

FIG. 5 is a sectional view showing the whole of the first example.

FIG. 6 is a sectional view showing another example of the structure of the second clamp plate in the first example.

FIG. 7 is a sectional view showing a second example of the embodiment of the present invention.

FIG. 8 is a sectional view showing a modified example of the second printing plate in the first example.

FIG. 9 is a sectional view showing a modified example of the second printing plate in the first example.

FIG. 10 is a sectional view showing a basic structure of a conventional stencil printing apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... stencil paper, 2 ... printing drum, 3 ... base, 4 ... disk-shaped member, 5 ... 1st plate seat as 1st base material, 10 ... 1st holding | maintenance means, 15 ... ink-permeable member, 16 ... Second plate seat as second base material, 17. Spring as elastic member, 18.
Holding means, 32: fan, 60: pressure roller as pressure member.

Claims (4)

[Claims] 1. A printing drum which winds a perforated stencil sheet around an outer peripheral surface thereof and rotates around a central axis of the stencil sheet, and a printing drum provided on the outer peripheral surface of the printing drum for holding a leading end of the stencil sheet. A stencil printing machine comprising: 1 holding means; and second holding means provided on an outer peripheral surface of the printing drum and holding a rear end of the stencil sheet. 2. A stencil sheet provided at a predetermined position near the printing drum and wound around the outer peripheral surface of the printing drum so that a rear end of the stencil sheet can be held between the printing drum and the second holding means. 2. The stencil printing apparatus according to claim 1, further comprising a fan that blows air toward the rear end to move the rear end toward the outer peripheral surface. 3. The stencil sheet, which is movably provided at a predetermined position near the printing drum and which holds the rear end of the stencil wound around the outer peripheral surface of the printing drum, between the second holding means and the printing drum. The stencil printing apparatus according to claim 1, further comprising a pressing member that presses the rear end to an outer peripheral surface so as to be able to perform the pressing. 4. A base body comprising: a pair of disc-shaped members coaxially disposed on a common center axis; and a first base member connecting the pair of disc-shaped members, and rotating around the center axis. An ink-permeable member that has one end attached to the base and is wound around the pair of disc-shaped members to form a peripheral surface for attaching a stencil sheet; and the other end of the ink-permeable member. The attached second base member, and the second base member is elastically connected to the base member such that the ink-permeable member is wound around the pair of disc-shaped members with a predetermined force. Stencil printing, comprising: an elastic member; first holding means provided on the base for holding the leading end of the stencil; and second holding means provided on the second base for holding the rear end of the stencil. apparatus.