JPS63114691A - Thermal stencil paper - Google Patents

Abstract

PURPOSE:To make it possible to automatically clean heat generating elements of a thermal head while performing a stencil-making operation, by providing a stencil paper with a cleaning part on the side for contact with the thermal head. CONSTITUTION:A cleaning part 104 is provided near the pull-out side end of a rolled form stencil paper 101, at a part to be brought into contact with heat generating elements 103 of a thermal head 102. The cleaning part 104 is provided by, for example, applying a coating material, prepared by dispersing a metallic oxide (abrasive member 106) such as chromium oxide, aluminum oxide and iron oxide in a binder, directly to a main body 105 of a raw paper obtained by laminating a heat-sensitive film such as a polyester film and a fine denier paper formed from polypropylene or the like with each other. Before a stencil- making step in a stencil-making and printing operation, the cleaning part 104 of the stencil paper 101 is brought into frictional contact with the heat generating elements 103 of the thermal head 102, whereby the elements 103 are cleaned.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a thermal stencil printing base paper (hereinafter referred to as "stencil paper j" in ii) that is selectively heated and made by sliding contact with a thermal head. It is something.

(B) Conventional technology Apparatuses for making stencil sheets using a thermal head have already been proposed (see, for example, Japanese Patent Laid-Open No. 58-39457 and Japanese Patent Laid-Open No. 59-14367). In this device, a stencil sheet is brought into sliding contact with a thermal head in which heating elements are continuously and closely arranged in a direction perpendicular to the direction of movement of the stencil sheet, and the stencil sheet is selectively heated and melted to make a plate. It is something.

Therefore, some of the resin components of the stencil paper melted by the thermal head adhere to this thermal head, and if a large amount is used for plate making, there is a possibility that defective plate making will occur, so it is necessary to clean this thermal head as appropriate. , this work is complicated.

Although the industrial application field is completely different from the present invention,
A cleaning tape for cleaning the magnetic head of a tape recorder and a magnetic tape to which the cleaning tape is connected are known (Japanese Patent Publication No. 1983-1999).
32723, see Utility Model Publication No. 51-52965). However, a cleaning tape for cleaning the thermal head as described above does not exist or is known.

(c) Problems to be Solved by the Invention As mentioned above, in the conventional technology, it is necessary to clean the thermal head appropriately, but this work is complicated and easy to forget. There is a possibility that this may lead to a decrease in plate-making quality and, in turn, to a deterioration in printing quality.

(d) Means for Solving the Problems The present invention provides a stencil paper that is made by slidingly contacting a thermal head, and which has a method for cleaning the thermal head at least on a part of the surface that comes into contact with the thermal head. It is characterized in that a cleaning section is formed.

(E) Function In the present invention, since the cleaning portion is formed on the surface of the stencil paper that comes into contact with the thermal head, the heating element of the thermal head is activated every time one or more plate-making operations are performed. It will be cleaned by the cleaning section.

Embodiment FIGS. 1 to 7 show examples of the stencil paper according to the present invention, and FIGS. 8 and 9 show a stencil printing apparatus in which the stencil paper is used.

Figure 1 shows a stencil sheet (101) extending in a band shape in one direction.
FIG. 3 is a perspective view showing a product wound into a roll. Near the end of the roll of stencil paper (101) on the drawer side,
A cleaning part (104) is attached to the part of the thermal head (102) (see Fig. 7) that comes into contact with the heating element (103).
) is formed.

The cleaning section (104) cleans a base paper body (105) in which a heat-sensitive film such as a polyester film and a fine denier paper such as polypropylene are superimposed, for example.
It is formed by directly applying a paint made by dispersing a metal oxide (abrasive member (106)) such as chromium oxide, aluminum oxide, or iron oxide in a binder.

The cleaning section (104) may be formed near the winding side end of the roll-shaped stencil paper (101).

FIG. 2 is a plan view showing a sheet-fed stencil paper (101). In this stencil paper (101), a cleaning section (104) is formed along an edge on the upstream side perpendicular to the direction of movement during plate making (the direction of the arrow).

FIG. 3 is a side view of essential parts of the stencil paper (101) shown in FIG. 1. In this stencil paper (101), the abrasive member (106) is directly attached to the stencil body (105) as described above.

FIG. 4 is a side view of essential parts showing another embodiment of the stencil paper (101). In this stencil paper (101), a connecting film (107) is attached to the edge of the stencil main body (105) extending in a direction perpendicular to the direction of movement during plate making.
Film (108) to which the polishing member (106) is attached
is connected.

FIG. 5 is a side view of a main part showing still another embodiment of the stencil paper (101). In this stencil paper (101), a film (108) to which an abrasive member (106) is attached is adhered to the surface of the stencil body (105) on the side that comes into contact with the thermal head (102).

FIG. 6 is a side view of main parts showing still another embodiment of the stencil paper (101). In this stencil paper (lot), a part of the film (10B) to which the polishing member (106) is attached is adhered to the end of the stencil main body (105).

Figure 7 shows the heating element (10) of the thermal head (102).
FIG. 3 is an enlarged side view showing the portion 3). As is clear from this figure, the stencil paper (101) is attached to the platen roller (10
9) in the direction of the arrow, and the heating element (103) of the thermal head (102) is pressed from above.

Note that the cleaning part (10/I) may be formed of a member such as a nonwoven fabric whose structure itself has mechanical cleaning properties.

Next, the structure and operation of the prepress printing apparatus will be explained with reference to FIGS. 8 and 9. Among these figures, FIG. 8 is an external perspective view, and FIG. 9 is an internal configuration diagram.

In these figures, (11 is the main body of the plate-making printing device;
A well-known cylindrical plate cylinder (2) is rotatably mounted inside. A support shaft (4) extending parallel to the rotation axis (3) of the plate cylinder (2) is rotatably inserted into the non-printing area of the plate cylinder (2). A plurality of hook-shaped set hooks (5) that can protrude in the centrifugal direction from the circumferential surface of the barrel (2) are arranged along the extending direction of the support shaft (4).

Further, an abbreviated lever (6) for rotating the support shaft (4) is fixed to the protrusion of the support shaft (4) from the side end surface of the plate cylinder (2). ing.

Therefore, the cent hook (5) and the lever (6) are configured to be able to swing together about the support shaft (4). Furthermore, the aforementioned Theftoff 7
A spring member (not shown) is attached to the cylinder (5), and its tip is located at a first position (solid line position) where it is spaced apart from the plate cylinder (2), and at a position where it is positioned at a first position (solid line position) where it is spaced apart from the plate cylinder (2). It is configured to be able to swing in a controlled manner between a second position (dash line position) where it is in pressure contact with the trunk (2).

(8) is for supplying printing ink into the plate cylinder (2);
This is the ink supply port.

On the upper left side of the device main body (11) is a paper holding shaft 0 on which a rolled stencil paper (101) is attached.
υ is provided, and this base paper holding shaft θυ has a substantially T-shaped,
A thermal head holding arm (9) is swingably provided. The one free end of the thermal head holding arm (9) is engaged with and locked with the free end of the lock lever, and the other free end is used to maintain a constant conveying angle of the stencil paper (101). A guide pin 0 is provided for this purpose. Further, a holding pin (88) is installed on the substantially central side surface of the thermal head holding arm (9).
), a thermal head holding lever (89) to which a thermal head (102) is fixedly attached is rotatably mounted.

A tension spring A4 is stretched between one end of the thermal head holding lever (89) and the thermal head holding arm (9), and the thermal head (102) is moved against the platen by the elastic force of this tension spring Q41. It is pressed by the roller (109). (92) is for thermal/throat holding arm (9
), the lock lever is
(2), and then release this thermal head holding arm (9).
When the thermal head holding lever (89) is rotated counterclockwise about the base paper holding axis αυ as a fulcrum, the tension spring 04) prevents the thermal head holding lever (89) from rotating clockwise indefinitely.

On the downstream side of the thermal head (102), there is a photosensor aη for operating a cutting device αe, which will be described later, by detecting a display section (not shown) attached to the stencil paper (101). It is provided.

A recess 01 is provided in the guide Ql on the downstream side of the photosensor 07>, and a heat wire (to) is provided above the recess a1, perpendicular to the transport direction of the stencil paper (101), and A cutting device is provided which is suspended at a constant angle to the plane. This cutting device OI thermally cuts a band-shaped stencil paper (101) into a desired length dimension, and mainly uses a swinging lever (2) that can move up and down t1.
1) and a vertical motion field (22) engaged with its free end.
), and the heat wire 4 is stretched near the lower end of this vertical motion field (22). (23
) is mentioned above)! This is a drive lever for driving the movement bar (21).

On the downstream side of the heat wire (2), there is a capstan (2) fixed to the rotating shaft (24) via a one-way clutch.
5), and a pinch roller (27) rotatably attached to one end of an L-shaped support lever (26) and pressed against the capstan (25). Means are provided.

On the downstream side of the base paper transport means, there is a support shaft (2
A swing guide (29) whose upstream free end can swing vertically about 8) as a fulcrum is provided.

Below the swing guide (29), an L-shaped swing arm (
An arc-shaped course change guide (
31), and the other end of the swing arm (30) is connected to a solenoid (32). Said course change guide (
31), when the solenoid (32) performs a suction operation, its upper end moves upward and pushes up the swing guide (29), and its upper end enters the horizontal base paper feeding path. (First position shown in dashed lines in Figure 9). Further, when the power to the solenoid (32) is cut off and its suction operation is stopped, the course change guide (31) falls due to its own weight, and its upper end exits the base paper feeding path (Fig. 9). (second position shown in solid line).

Further, below the course change guide (31), a guide is provided for transferring the stencil paper (101) whose course has been changed by the course change guide (31) to the outside (left side) of the apparatus main body (1). A conveyor (33) is provided, and a base paper outlet (34) is provided on the downstream side of this conveyor (33), and a base paper loading tray (35) is provided outside of this base paper outlet (34). It is attached removably.

Above the swing guide (29), a vertical fixed guide (
36), and a reflective photosensor (37) for detecting the bent state of the arms of the stencil paper (101) is fixed to this vertical fixed guide (36).

A horizontal fixed guide (93) is provided on the horizontal downstream side of the swing guide (29). This horizontal fixed guide (93) and the paper feed roller (39) which is in pressure contact with the upper surface thereof are both connected to the upper cover (38) of the apparatus main body ill.
) is attached to the bottom surface of the In addition,...the base paper feeding roller (39) is connected to a pulley (41) of a motor (40) which is also attached to the upper cover (38), a timing belt (42), and a one-way clutch (not shown). connected via. The motor (40) operates when the photosensor (37) detects the stencil paper (101).
In synchronization with the detection signal, the downstream (!I) of the stencil paper (101)
! This is for transporting the I end portion to the safety plate (5) of the plate cylinder (2).

Note that even after the downstream end of the stencil paper (101) is held by the cent hook (5), the capstan (25)
) and the pinch roller (27) continue rotating for m. When the stencil paper (101) bends its arm downstream of the vertical fixed guide (36) and its presence is detected by the photosensor (37), the plate cylinder (2) slowly rotates. In this way, the printing cylinder (2) rotates intermittently every time the stencil paper (101) bends its arm, and the stencil paper (101) is fed while being screwed. At this time, the base paper feeding roller (3
9) is driven by the stencil paper (101).

On the right side of the plate cylinder (2) is the stencil paper (1) after printing is completed.
01) from the plate cylinder (2) and discharges it. This plate discharge device includes a pair of plates that are attached to and separated from the plate cylinder (2) to peel off the stencil paper (101) after printing from the plate cylinder (2) and to transport it into the plate discharge box (43). Discharge roller (44) (4,
5) is provided. The plate discharge box (43) is
It is installed so that it can be inserted into and removed from the main body (1) horizontally, and the stencil paper (101
) is full, the stencil paper (101) inside can be easily disposed of by removing it horizontally from the apparatus main body (1) and opening its lid (46).

The original fa (47) is placed on the upper part of the plate discharge box (43).
A document reading device (48
) is provided. This document reading device (4 days) consists of two pairs of document transfer rollers (49) that rotate in synchronization with each other in order to horizontally transfer the document (47) on the upper surface of the device body (1). 50), (51), and (52) are arranged in parallel. These document transport roller pairs (49) (5
0), (51) and (52), the lower roller (50),
(52) is connected to a pulley (55) of a motor (54) via a timing belt (53) (partially not shown). Both document transport roller pairs (49) (50), (5
1) Microsinches (56) and (57) for detecting the original (47) are provided inside (52), respectively.

Both document transport roller pairs (49) (50), (51)
(52) Below the approximately central portion is a charge transfer element (CC).
A guide (59) that holds the upper surface of the original (47) is provided on top of the imager (58).
At the upper end of the right side of the device body (11),
Original W4N for holding the original (47) before imaging?
? j I-ray (60) is detachably attached.

Further, a recess (61) is provided on the upper surface of the upper cover (38) for placing the imaged original (47).

A paper feeding device for feeding printing paper is provided below the plate discharge box (43).

In the apparatus body (1), the recesses (63) (64) of the support arm (62) are attached to the bins (65) (66) so that the free end protrudes outward on the upstream side along the paper feeding direction. ) is removably engaged with. A support shaft (67) is installed horizontally near the free end of the support arm (62), and a side wall near the upstream end of the paper feed table (68) is rotatably supported on this support shaft (67). has been done. Therefore, the paper feed tray (68) and the support arm (62) can be attached to and detached from the apparatus main body (1).

A support shaft (69) is rotatably provided below the paper feed tray (68), and a base end of a push-up lever (70) is fixed to the center of the support shaft (69). A sector gear (71) is rotatably fitted onto the support shaft (69). Additionally, the device body +11 includes a motor (72).
A reduction gear case (73) is fixedly installed, and an idler gear (74) is rotatably interposed between the reduction gear case (73) and the sector gear (71).

(75) is a paper abutting plate curved in an arc that faces the swing locus of the downstream edge of the paper feed tray (68) with a gap equal to the note; The downstream edge of the stacked paper is configured to abut vertically slidably.

A paper feed tray (68) is provided at the upper end of the paper contact plate (75).
A rubber paper feed roller (76) is provided to feed the sheets stacked above one by one, and the rotating shaft (77) of this paper feed roller (76) is connected to a paper feed mechanism (not shown). It is connected to the.

Note that the paper feed tray (68) is provided with a spring (not shown) that biases the downstream free end thereof clockwise (upward), and this spring causes the paper feed tray (68) to The paper stacked on top is in the direction of the paper feed roller (76) (above).
is under pressure.

When all of the printing paper on the paper feed tray (68) is fed or a paper jam occurs, the motor (72) rotates and the paper feed tray (68) rebounds against the spring. Rotate clockwise and return to the initial 1υ1 position.

The downstream side ( along the paper feeding direction) of the paper feeding roller (68)
On the left side), the printing paper fed by the paper feed roller (68) is stopped once and then re-feeded toward the transfer section of the plate cylinder (2) at the appropriate timing. A second pair of paper feed rollers (78) and (79) are provided.

At the bottom of the plate cylinder (2), the second paper feed roller pair (
78) A press roller (80) is provided for transferring printing ink onto the printing paper re-fed by (79). This press roller (80) is connected to the plate cylinder (2).
It is configured to selectively come into pressure contact only with the printing area.

The printing paper on which the printing ink has been transferred (printed) is
The paper is further transported downstream by the plate cylinder (2) and the press roller (80), and is loaded on L of the well-known paper discharge tray (8I). (82) is the main motor.

Therefore, in order to perform the prepress printing operation according to this embodiment, first, the original (47) is placed face down on the top surface of the apparatus main body (1) with the side to be printed facing down, and the original is transported. It is sufficient to insert it from the right side to the left side of the roller pair (49) (50) and operate the starting switch (not shown) to start it. Then, the motor (54) rotates, and accordingly, both document transport roller pairs (49) (50), (51) (5
2) rotates, and the document (47) slides and scans over the imaging device (58). At this time, the imaging device (58) is operating, and the original image to be printed is converted into an electrical signal, amplified, and input to the thermal head (102).

Therefore, the thermal head (102) generates heat corresponding to the original image.

On the other hand, while the document reading device (48) is reading the document (47), the thermal head (102) is in pressure contact with the platen roller (1) through the stencil paper (101).
09) is the original transport roller pair (/19) (5
0), (51), and (52), and the original image is made into a stencil sheet (101) as it is. Note that before plate making, the cleaning section (104) of the stencil paper (101) cleans the heating element (10) of the thermal head (102).
3), and the heating element (103) is cleaned.

The stencil paper (101) that has been made is attached to the capstan (
25) and the pinch roller (27), and is further transferred to the downstream side. At this time, the swing guide (29
) is in a horizontal position (solid line), and the course change guide (
31) is also located below (solid line), so the stencil paper (101) is further transported in the horizontal direction, but at this point the paper feed roller (39) is still stopped and the downstream side The end is prevented from advancing and bends into 11 sections.

When the stencil sheet (101) bends its arm and its presence is detected by the photosensor (37), the stencil feed roller (39) rotates as described above, and the downstream end of the stencil sheet (101) is rotated. It reaches the bottom of the center hook (5) of the plate cylinder (2).

Then, the stencil paper (101) is attached to the upper cover (3).
The set footer (5) is detected by a photosensor (91) attached to the guide (90) serving as the set footer (5).
) is closed, and then the plate cylinder (2) slowly rotates clockwise as described above, and the stencil paper (101) after plate making is wound around the plate cylinder (2). Thereafter, the stencil paper (101) is cut by the cutting device αe at a predetermined position on the upstream side.

When the required number of sheets have been printed, the set hook (5) is automatically or manually released and the plate 54 (2) is released.
) The stencil paper (101) wrapped around the stencil paper (lot
) is removed, the cent hook (5) closes once, but opens again when it reaches the top due to the rotation of the plate cylinder (2), and opens the next stencil (101). enters standby state.

Next, the steps in the case where only the plate-making operation is executed according to this embodiment will be explained.

The imaging operation of the original document (47) and the stencil-making operation of the stencil paper (101) are no different from the stencil-making and printing operations described above.

The difference is that the solenoid (32) that drives the course change guide (31) is energized;
(31) moves upward (dashed line), and the swing guide (29) also shifts clockwise accordingly (dashed line).

In this way, when the course change guide (31) is positioned upward, the capstan (25) and the pinch roller (27)
) Post-press stencil paper (101) fed by
makes a U-turn downward along the course change guide (31) and is placed on the conveyor (33). Then,
The stencil paper (101) is transported by the conveyor (33) to the stencil outlet (34) of the apparatus main body (1), and is led out from the stencil outlet (34) onto the stencil loading tray (35).

Therefore, take out the stencil paper (101) after making the plate,
It can be installed on other printing machines.

(G) Effects of the Invention In the present invention, since the cleaning portion is formed on the surface of the stencil paper that comes into contact with the thermal head, the heating element of the thermal head can be automatically cleaned while performing the plate-making operation. Can be done.

Therefore, high-quality plate making can be performed at all times without the troublesome work of cleaning the thermal head, so that it is possible to simplify the plate making work and improve printing quality.

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention, and FIG.
FIG. 9 shows a prepress printing apparatus in which an embodiment of the present invention is used. Fig. 1 is a perspective view of the first embodiment, Fig. 2 is a plan view of the second embodiment, Fig. 3 is a side view of main parts of the first embodiment, and Fig. 4 is a third embodiment. FIG. 5 is a side view of the main part of the fourth embodiment. FIG. 6 is a side view of the main part of the fifth embodiment.
The figure is a side view of the main part of the embodiment that is in contact with the thermal head, FIG. 8 is an external perspective view, and FIG. 9 is an internal configuration diagram. (101)...Stencil paper, (102)...Thermal head, (103)...Heating element, (104)...
Cleaning section, (105)...Base paper main body, (106
)... Polishing member, (107)... Connection film,
(108) ...film.

Claims (1)

[Scope of Claims] 1. A base paper for thermal stencil printing that is made into a plate by slidingly contacting a thermal head, which has a cleaning section for cleaning the thermal head on at least a part of the surface that comes into contact with the thermal head. A base paper for heat-sensitive stencil printing, characterized in that: 2. The base paper for thermal stencil printing according to claim 1, wherein a polishing member having a cleaning action is attached to a part of the surface that comes into contact with the thermal head. 3. A film according to claim 1, wherein a film to which an abrasive member having a cleaning action is attached is connected to an edge of the base paper body extending in a direction perpendicular to the direction in which it moves during plate making. Base paper for thermal stencil printing. 4. Thermal stencil printing according to any one of claims 1 to 3, wherein a film having an abrasive member having a cleaning action attached is adhered to a part of the surface that comes into contact with the thermal head. Base paper. 5. Any one of claims 1 to 4, wherein the base paper body has a band shape extending in one direction, and a cleaning section is formed near at least one end of the base paper body. Base paper for thermal stencil printing described in . 6. The thermal stencil printing base paper according to claim 1, wherein the cleaning portion is formed of a member whose structure itself has mechanical cleaning properties.