JPH0338373A - Screen printing apparatus - Google Patents

Abstract

PURPOSE:To prevent the curl of screen printing base paper in an upper direction and to certainly wind the screen printing base paper around a plate cylinder or feed the same to a plate discharge means by providing the guide piece held in a detachable manner between the clamp piece, which is provided so as to extend above the engaging position of the screen printing base paper present in the operation region of the clamp piece in order to guide the screen printing base paper from above and revolves in order to engage the screen printing base paper, and the engaging position of the screen printing base paper. CONSTITUTION:Even when the screen printing base paper S fed in above the engaging position on a plate cylinder 3 has a habit bending upwardly, said base paper S is guided by a guide piece 50 to be prescribed in its upper limit position and, therefore, it is prevented that the base paper is detached from the operating region of a clamp piece 9 to show a clamping impossible state. The clamp piece 9 is revolved in a counterclockwise direction to be attracted to a magnet plate 7 and fixes the screen printing base paper S guided by the guide piece 50 so as to hold the same between the clamp piece 9 and a plate mounting seat part 5 or the magnet plate 7. At this time, the guide piece 50 is pushed down by the clamp piece 9 to enter the recessed part 51 of the plate mounting seat part 5 and held in the space demarcated by the recessed part 51 and the clamp piece 9 along with the end part of the screen printing base paper S.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is directed to a stencil plate having a function of automatically loading a stencil made into a stencil onto a printing cylinder or automatically discharging a used stencil. The present invention relates to printing devices.

[Conventional technology]

A rotary stencil printing device equipped with a rotating plate cylinder (
For example, an invention proposed by the present applicant is disclosed in JP-A-59-96984 as a means for locking one end of the base paper to the plate cylinder in order to wrap the base paper around the outer peripheral surface of the plate cylinder and attach it. . The device of the present invention includes a clamp piece that is swingably provided on the outer peripheral surface of a plate cylinder, and a magnetic plate that fixes the clamp piece to the outer peripheral surface, and the clamp piece and the magnetic plate are magnetically attached to each other. It is configured to lock one end of the base paper between the two.

(Problems to be Solved by the Invention) In the stencil printing apparatus as described above, stencil paper wound into a roll is generally used. The leading edge of such stencil paper may curl upward due to curling in the winding direction or changes in various conditions during the manufacturing process, and if this curl is large, the following problems may occur: occurs.

That is, when the clamp piece is opened in the above-described paper locking device, the leading end of the stencil paper curls upward. If the degree of curl is small, there will be no particular problem in the next plate discharge process, or if the curl of the stencil paper is accelerated due to factors such as temperature and humidity, it may be difficult to perform the next plate discharge process reliably. I won't be able to do it. Such curling of the stencil paper is a problem not only during the plate discharge process but also at the time of plate setting, in which the stencil paper is introduced and clamped.

The present invention has been made in view of the above points, and prevents the leading edge of the stencil paper from curling upward during clamping or after unclamping, and prevents the stencil paper from being wrapped around the printing cylinder or up to the stencil ejecting means. It is an object of the present invention to provide a stencil printing apparatus that can reliably transport stencil paper and always perform normal printing or stencil discharge processing.

(Means for Solving the Problems) A stencil printing apparatus according to a first aspect of the present invention has a plate cylinder equipped with a rotatable clamp piece on its outer circumferential surface, and has one end of a fed stencil-made stencil paper that is attached to the plate cylinder. In a stencil printing device that is secured by a clamp piece and that performs printing after wrapping the stencil paper around the outer peripheral surface of the plate cylinder and printing, the stencil paper is placed within the operating area of the clamp piece in order to guide the stencil paper from above. A guide piece is extended above the locking position of a certain stencil sheet, and
This guide piece is characterized in that it is configured to be removably held between the clamp piece and the locking position.

A stencil printing apparatus according to a second aspect of the present invention has a plate cylinder equipped with a rotatable clamp piece on its outer circumferential surface, and the clamp piece locks one end of the fed stencil paper, which has been made into a stencil. In a stencil printing device in which the stencil paper is wrapped around the outer circumferential surface of the printing cylinder, and after printing, the stencil paper is peeled off from the printing cylinder by a stencil discharge means, the clamp piece is used to guide the stencil paper from above. A guide piece is provided above the locking position of the stencil paper in the operating area, and when locking the stencil sheet, the guide piece is pulled out between the clamp piece and the locking position of the stencil paper. The guide piece is held in a removable manner, and when the stencil sheet is released, the guide piece comes into contact with the clamp piece and is elastically deformed. The present invention is characterized in that a guide member is provided that moves from an upper position to an upper position of the plate discharging means to follow the rotation of the clamp piece.

(Function) According to the stencil printing apparatus of claim 1, the end portion of the stencil paper fed above the locking position of the plate cylinder is guided from above by the guide piece. When the clamp piece rotates and locks the stencil sheet in the locking position, the guide piece is also held between the clamp piece and the locking position, but as the plate cylinder rotates, the guide piece is easily released from the clamp piece. Get out.

According to the stencil printing apparatus of the second aspect, the clamping operation at the time of printing is the same as that of the apparatus of the first aspect. When the clamp piece is released during plate discharge, the rotating clamp piece contacts the guide piece from below and elastically deforms the guide piece. During this time,
The released end of the stencil sheet is guided from above by guide pieces or clamp pieces. When the clamp piece and the guide piece are separated, the guide piece returns to its original shape and returns downward, pressing down on the stencil paper. Thereafter, the printing cylinder rotates to send the edge of the stencil paper toward the printing plate discharging means. The end of the stencil sheet that has come off the front housing part as the printing cylinder rotates is guided by the guide member until it reaches the stencil discharge means.

(Example) An embodiment of the present invention will be described with reference to the drawings.

First, this embodiment is a rotary stencil printing apparatus 1 having a plate-making device 2 and a plate-discharging device 25, and FIG. 1 is a cross-sectional view showing its schematic configuration, and FIG. 2 is a plan view of its main parts. .

In the figure, 3 indicates a plate cylinder. The plate cylinder 3 is constituted by a cylindrical body having a porous structure that allows ink to pass through, and has a base paper locking device 4 that selectively locks one end of the stencil paper S on a part of its outer circumferential surface. It is designed to be rotated clockwise in the figure around its own central axis by an electric motor.

An ink supply device including a squeegee roller 10, a doctor rod 11, and an ink supply pipe 12 is provided inside the plate cylinder 3. The ink supply device supplies printing ink to the inner peripheral surface of the plate cylinder 3 in accordance with the rotation of the plate cylinder 3. and,
A stencil sheet S, whose one end is locked to the plate cylinder 3 by a sheet locking device 4, is wrapped around the outer peripheral surface of the plate cylinder 3 by the viscosity of printing ink. A press roller 13 is provided at a portion facing the squeegee roller 10 across the plate cylinder 3, that is, below the plate cylinder 3.
Reference numeral 3 presses printing paper (not shown) toward the outer circumferential surface of the plate cylinder 3, and cooperates with the plate cylinder 3 to perform stencil printing.

Next, the base paper locking device 4 will be described in detail.

First, a plate mounting seat 5 is provided on a part of the outer peripheral surface of the plate cylinder 3. The upper surface 5a of the plate mounting seat 5 has two flat surfaces, and on both sides of the upper surface 5a in the circumferential direction of the plate cylinder 3, strip-shaped magnetic plates are arranged so that the longitudinal direction coincides with the central axis of the plate cylinder 3. 6.7 are embedded and fixed respectively. The magnet plate 6.7 is made of a permanent magnet with appropriate flexibility, such as a rubber magnet with a multipolar structure, and its outer surface (upper surface) is flush with the upper surface 5a of the plate mounting seat 5.

Bearing brackets 8a are provided between the two magnet plates 6 and 7 of the plate mounting seat 5 at both ends of the plate cylinder 3 in the central axis direction. Pivot shafts 8 integrally provided with strip-like clamp pieces 9 are rotatably engaged with the bearing brackets 8a.

The clamp piece 9 is rotatably supported on the plate cylinder 3 by a pivot 8 parallel to the central axis of the plate cylinder 3. That is, the clamp piece 9 is in a first state (clamped state) in which it is magnetically attracted to one of the magnetic plates 6 as shown in FIGS. 1 and 2, and in a first state (clamped state) in FIGS. 5 and 6. As shown in , the axis is separated from the magnet plate 6, rotated by approximately 180 degrees, and is magnetically attracted to another magnet vi7 in the second state (unclamped state). It can be rotated around 8.

A driven gear 8b is attached to one end of the pivot 8,
A drive gear (not shown) is selectively engaged with the driven gear 8b, and thereby the clamp piece 9 is rotated between the clamped state and the unclamped state. It looks like this. If a more detailed explanation of the drive structure of the clamp piece 9 is required, please refer to Japanese Patent Application No. 57-207217.

A base paper storage section 14 is provided on one side of the plate cylinder 3. The base paper storage section 14 stores a continuous sheet of stencil paper S wound into a roll.

A plate making device 2 is provided between the base paper storage section 14 and the plate cylinder 3. The plate-making device 2 has a thermal head 15 as a heat-sensitive plate-making device and a platen roller 16, and is supplied with stencil paper S from the stencil storage section 14 and processes the stencil paper S.
The plate making process is now done using a thermal method.

A base paper stock installation 17 is provided between the plate making device 2 and the plate cylinder 3. The base paper stock device 17 includes a box-shaped base paper stock section 18 that can store stencil sheets S having a length corresponding to several sheets of stencil paper S in a meander shape, and a box-shaped base paper stock section 18 that can store stencil sheets S having a length equivalent to several sheets of stencil paper S, and a stencil stock section 18 that stores stencil sheets S from the stencil making device 2 to the base paper stock section 18. It has a base paper feed roller 19 that feeds the base paper S, and a base paper feed roller 20 that delivers the stencil paper S from the base paper stock section 18 to a base paper cutting device 21 to be described later.

A base paper cutting device 21 is provided between the base paper feeding roller 20 of the base paper stocking device 17 and the plate cylinder 3. The base paper cutting device 21 includes a cylindrical rotary blade 23 having a spiral blade portion 22 on the outer peripheral surface and a flat blade 2 in contact with the rotary blade 23.
4, and the stencil paper S is cut by the double blades 23 and 24.

A plate discharging device 25 as a plate discharging means is provided on the opposite side of the plate making device 2 with the plate cylinder 3 in between. The plate discharge device 25 has a pair of rollers 26, a base paper stripping claw 27, and a base paper waste box 28.

The roller pair 26 includes metal rollers 29 that are supported by a lower rotating shaft and a -E rotating shaft that are provided at the entrance of the paper waste box 28 so as to be parallel to the axis of the plate cylinder 3, and engage with each other.
and a rubber roller 3o. The metal roller 29 is rotated clockwise in the figure by an electric motor 31. As shown in the figure, the roller pair 26 is provided at a position very close to the paper locking device 4 of the plate cylinder 3 at the plate loading/discharging position on the side opposite to the paper cutting device 21.

The base paper stripping claw 27 has its base end pivotally supported by a pivot 32, and the end opposite to the tip of the claw across the pivot 32 is drivingly connected to a plunger of a solenoid device 33. . In this way, the base paper stripping claw 27
It is rotatably driven between a base paper stripping position close to the plate cylinder 3 and a retracted position rotated counterclockwise around a pivot 32 from the base paper stripping position.

Next, at a position above the plate cylinder 3 and in contact with the clamp piece 9 which rotates at the plate loading/discharging position shown in FIG. A guide member 40 is provided. This phrase “J that moves following the rotation of the clamp piece 9” means that the guide member 40
This means that the clamp piece 9 deforms or moves without hindering the rotation of the clamp piece 9. In this embodiment, the guide member 40
is made of a flexible member, and the guide member 40 is deformed by the rotating clamp piece 9. As shown in the second lesson, the guide member 40 is a plurality of foot plate-shaped members, one end edge on the paper cutting device 21 side is fixed to the case 23a of the rotary blade 23, and the plate discharging device 2
The other end edge on the 5 side is disposed in the base paper waste vU 28 in a movable state without being fixed. If a more detailed explanation of the structure of this guide member is required,
Please refer to Japanese Patent Application No. 63-152390.

Next, as shown in FIGS. 1 and 2, a pair of guide pieces 50 are provided below the guide member. These guide pieces 50 are cantilever-shaped members whose ends are fixed to the case 23a, and their free ends extend above the position where the stencil paper S is locked. That is, the base paper locking device 4 is connected to the plate cylinder 3.
When set at the highest position, the stencil source is within the operating range of the clamp piece 9, and there is a 1. The free end of the guide piece 50 is set above the upper surface 5a of the plate mounting seat 5. As shown in FIG. 2, these pair of guide pieces 50,50 are
They are disposed on the outside of the magnet plate 7 when viewed from above, and are configured to come into contact with both side portions of the rotating clamp piece 9, respectively. Further, as shown in FIG. 3, a recess 51 into which the guide piece 50 pressed by the rotating clamp piece 9 enters is formed in the part of the plate mounting seat 5 that faces the guide piece 50. ing. The outer shape of the recess 51 matches the free end of the guide piece 50, and its depth is
It is slightly larger than the total dimension of the thickness of the guide piece 50 and the length of the stencil sheet S (7).

Next, the actions and effects of C-J on the configuration of E are shown in Figure 4~
This will be explained with reference to FIG.

During stencil printing, initially there is no stencil paper S in the stencil stock section 18, and the stencil paper S heads directly from the stencil feed roller 19 to the stencil feed roller 2°, and its tip reaches the stencil cutting device 21. In this state, when the rjU image information signal is applied to the thermal head 15 of the plate-making device 2 and plate-making is started, the base paper feed roller 19
is rotationally driven, and as the plate making progresses, the stencil paper S which has already been made has been fed into the paper stock section 18.

- When the stencil making for one sheet, in other words, the length required for printing is completed, the stencil feed roller 20 is driven to rotate, whereby the leading end of the stencil paper S is brought into contact with the clamp piece 9 of the plate cylinder 3. Sent.

As shown in FIG. 4, even if the stencil sheet S fed above the locking position on the plate cylinder 3 has a tendency to curl upward, it is guided by the guide piece 50 and its upper limit position is regulated. Therefore, there is no possibility that the clamp piece 9 will move out of the operating range and become unable to be clamped.

As shown in FIG. 5, the clamp piece 9 rotates counterclockwise in the figure and magnetically attaches to the magnet plate 7, and the stencil paper S guided by the guide piece 50 is moved from the plate mounting seat 5 to the magnet. It is clamped and fixed between the plates 7. As shown in FIGS. 5 and 7, at this time, the guide piece 50 is pushed down by the clamp piece 9 and enters the recess 51 of the plate mounting seat 5, and the space defined by the recess 51 and the clamp piece 9. The end portion of the stencil paper S is held within the stencil sheet S.

At this time, although not shown, the tip of the clamp piece 9 comes into contact with the lower surface of the guide member 40, causing the guide member 40 to bend in the E direction. That is, the guide member 40 can be deformed following the rotation of the clamp piece 9 for separating the stencil paper S, and does not hinder the operation of the clamp piece 9. Also, since this guide member 40 is provided just above the guide piece, the leading edge of the stencil paper S may come off the guide piece 50 for some reason. Even if the stencil sheet S flies to the side, the leading edge of the stencil sheet S is reliably guided over the entire width direction. Therefore, the tip of the stencil paper S is clamped by the clamp piece 9.
It does not protrude above the tip.

Next, when the clamping piece 9 completes the locking of the stencil paper S, the plate cylinder 3 is rotated clockwise in the figure. Since the guide piece 50 is not held between the clamp piece 9 and the plate mounting seat 5, it can be easily removed from the recess 51 without resistance as the plate cylinder 3 rotates, as shown in FIG. Then, as the printing cylinder 3 rotates, the printing of the stencil paper S onto the printing cylinder 3 is performed. When the stencil paper S corresponding to the length of one sheet required for printing is wound around the plate cylinder 3, the rotation of the stencil feed roller 20 is stopped and the stencil cutting device 21 is driven to cut the stencil paper S. be done. This completes the printing of the stencil paper S onto the printing cylinder 3, and the printing cylinder 3 continues to rotate to perform stencil processing.

Next, when a plate ejection command is issued from an operation unit (not shown) or the next plate making printing process is instructed, the stencil paper S, which is wrapped around the outer peripheral surface of the plate cylinder 3, is transferred to the plate cylinder 3. The plate is removed from the plate.

As shown in FIG. 9, the clamp piece 9 rotates clockwise in the figure. The end of the stencil sheet S whose lock is released begins to curl upward, and the guide piece 50 is pushed up from below by the rotating clamp piece 9 and deforms elastically.

Then, as shown in FIG. 10, when the clamp piece 9 further rotates and separates from the guide piece 50, the guide piece 50 returns to the lower position and uses its momentum to push the stencil paper S, which has begun to curl upward, from above. hold down If the stencil paper S is severely curled, the end of the stencil paper S will be greatly deformed and rolled up at the moment the clamp piece 9 is released, causing the guide member 40 located higher up.
In some cases, deformation cannot be controlled. However, in this embodiment, the guide piece 50 interlocking with the clamp piece 9 is designed to elastically hold down the stencil sheet S, which has started curling, immediately after it is released. This solves the conventional problem that the end portions of the stencil paper S are greatly curled and deformed at once when the clamp is released, and the end portions are no longer exposed to the stencil discharge device 25. After the stencil paper S comes off from the guide piece 50 as the plate cylinder 3 rotates, the stencil paper S is guided by the guide member 40 and is reliably sent to the stencil discharge device 25. .

Even during the clamp release operation, the tip of the clamp piece 9 comes into contact with the lower surface of the guide member 40, but since the guide member 40 bends upward, the rotation of the clamp piece 9 is not obstructed.

Next, the base paper stripping claw 27 moves from the standby position shown in FIG. 1 to a stripping position close to the plate cylinder 3, and in this state, the plate cylinder 3 rotates in the clockwise direction as seen in FIG. . As a result, the stencil paper S attached to the outer peripheral surface of the plate cylinder 3 is
The base paper is stripped from one end of the plate cylinder 3 by the base paper stripping claw 27 as the plate cylinder 3 rotates, and is guided by the tip of the base paper stripping claw 27 and enters between the metal roller 29 and the rubber roller 30. As the metal roller 29 rotates clockwise in FIG. 1 and the rubber roller 30 rotates counterclockwise as seen in FIG. The waste is transported inward for disposal.

As explained above, according to the stencil printing apparatus of this embodiment equipped with the guide piece 50, reliable printing can be performed even when using the stencil paper S with severe upward curling, thereby avoiding the occurrence of printing defects, etc. be done. Furthermore, at the time of printing, the locked end of the unlocked stencil sheet S can be reliably fed into the roller pair 26, so that the roller pair 26 can reliably transport the stencil sheet S for disposal into the stencil waste box 28. The occurrence of plate ejection defects is avoided.

In the embodiment described above, the guide piece 50 held between the clamp piece 9 and the plate mounting seat 5 is guided to a key point on the plate mounting seat 5 so that it can be easily removed by rotation of the plate cylinder 3. Piece 5
A recess 51 for storing 0 is provided. However, it goes without saying that such an effect can also be achieved by other structures. For example, the upper surface of the magnet plate 7 and the plate mounting seat 5
The upper surface 5a is not flush with the upper surface of the plate mounting seat 5, but the magnet plate 7 is made to protrude from the upper surface of the plate mounting seat 5 by a predetermined height, and the end of the clamp piece 9 magnetically attached to the magnet plate 7 and the upper surface of the plate mounting seat 5 are arranged. 5a so that a gap is created between the two. Then, insert the guide piece 5 into this gap.
0 may be held in a removable manner. Further, although the guide pieces 50 are provided at both ends of the clamp piece 9, they may be provided further inward.

(Effects of the Invention) According to the invention described in claim 1, since the stencil sheet can be locked with the clamp piece while being guided by the guide piece above the locking position, even stencil paper with strong curls can be securely locked. This has the effect of being able to be printed.

According to the invention as claimed in claim 2, in addition to the above-mentioned effects, since the stencil paper that starts deforming after the clamp is released can be immediately pressed down by the guide piece, the end of the stencil paper can be reliably fed into the stencil discharge means and defective parts can be prevented. This has the effect that it is possible to perform printing without any problems.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a plan view of essential parts of the embodiment, FIG. 3 is a perspective view of essential parts of the embodiment, and FIGS. 4, 5, and 6 The figure is a sectional view of the main part showing the printing operation in the same embodiment, FIG. 7(a) is a sectional view taken along the line ■-■ in FIG. 5, and FIG. 7(b) is a partial enlargement of FIG. 7(a). The sectional view, FIG. 8, FIG. 9, and FIG. 10 are principal part plan views showing the plate discharging operation in the same embodiment. S - stencil paper, 1 - stencil printing device. 3- plate cylinder, 9- clamp piece. 25-... A plate-reading device as a means of plate-reading. 40-Guiding member. 50.-Guidance piece. Patent applicant Riso Kagaku Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] 1. It has a plate cylinder equipped with a rotatable clamp piece on its outer circumferential surface, and one end of the fed stencil paper which has been made and is fixed by the clamp piece, and the stencil paper is In a stencil printing device that performs printing after printing by wrapping a stencil around the outer circumferential surface of the plate cylinder, a stencil is provided that extends above a locking position of the stencil paper within the operating area of the clamp piece in order to guide the stencil paper from above. established,
A stencil printing apparatus characterized in that a guide piece is provided that is detachably held between the clamp piece that rotates to lock the stencil paper and a locking position of the stencil sheet. 2. It has a plate cylinder equipped with a rotatable clamp piece on its outer circumferential surface, and one end of the fed stencil paper that has already been made is locked by the clamp piece, and the stencil paper is held on the outer circumferential surface of the plate cylinder. In a stencil printing device in which the stencil sheet is wrapped around the clamp piece and applied to the plate, and after printing, the stencil sheet is peeled off from the plate cylinder by a stencil discharge means, the stencil sheet is attached to the stencil sheet within the operating area of the clamp piece in order to guide the stencil sheet from above. It extends above the locking position, and is removably held between the clamp piece and the locking position of the stencil sheet when locking the stencil sheet, and releases the locking of the stencil sheet. a guide piece for the stencil sheet that elastically deforms in contact with the clamp piece; and a rotation of the clamp piece from a position above the plate cylinder contacting the rotating clamp piece to a position above the plate ejecting means. A stencil printing device characterized in that it is provided with a guide member that is displaced following the stencil printing device.