JP2802104B2 - Stencil printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a stencil provided with a function of automatically mounting a stencil made on a plate, or automatically discharging used stencil. The present invention relates to a printing device.

[Conventional technology]

In a rotary stencil printing machine provided with a rotating plate cylinder, as a means for locking one end of the base paper to the plate cylinder in order to wind and mount the base paper on the outer peripheral surface of the plate cylinder, for example, as proposed by the present applicant, An invention is disclosed in Japanese Patent Application Laid-Open No. 59-96984. An apparatus according to the present invention includes a clamp piece swingably provided on an outer peripheral surface of a plate cylinder, and a magnet plate for fixing the clamp piece to the outer peripheral surface. And one end of the base paper is locked.

[Problems to be solved by the invention]

In the above-described stencil printing apparatus, a stencil sheet wound in a roll is generally used. Such a stencil sheet may be curled upward due to curling due to the winding direction or a change in various conditions during the manufacturing process, and if the state of the curl is large, the following inconveniences may occur. Occurs.

That is, when the clamp piece is opened by the stencil retaining device, the leading end of the stencil is curled upward. When the degree of the curl is small, no problem occurs in the next plate discharging process.However, if the curling of the stencil sheet is promoted due to temperature, humidity, or the like, the next plate discharging process can be reliably performed. I can no longer do it. Such curling of the stencil sheet is a problem not only in the stencil sheet discharging process but also in the stencil sheet in which the stencil sheet is introduced and clamped.

The present invention has been made in view of the above points, and prevents upward curling of a stencil sheet leading end portion at the time of clamping or after unclamping, and prevents the stencil sheet from being wound around a plate cylinder or a plate discharging means. An object of the present invention is to provide a stencil printing apparatus capable of always performing normal printing or stencil discharge processing by reliably transporting a stencil sheet.

[Means for solving the problem]

The stencil printing machine according to claim 1 has a plate cylinder provided with a rotatable clamp piece on an outer peripheral surface, and locks one end of the fed stencil sheet having been fed with the clamp piece,
In a stencil printing apparatus that performs printing after winding the stencil sheet around the outer peripheral surface of the plate cylinder and performing printing, the stencil sheet is located at an engagement position of the stencil sheet in the operation area of the clamp piece to guide the stencil sheet from above. Extend the guide piece upward, and
The guide piece is configured to be detachably held between the clamp piece and the locking position.

The stencil printing machine according to claim 2, further comprising a plate cylinder having a rotatable clamp piece on an outer peripheral surface, wherein one end of the fed stencil sheet having been made is locked by the clamp piece and the stencil is fixed. In a stencil printing apparatus in which a stencil sheet is wound around the outer peripheral surface of the plate cylinder to form a plate, and after printing, the stencil sheet is peeled off from the plate cylinder by a stencil discharging means, the stencil sheet is guided by the clamp piece in order to guide the stencil sheet from above. A guide piece is extended above a position where the stencil sheet is locked in the operation area, and when the stencil sheet is locked, the guide piece is pulled out between the clamp piece and the locking position of the stencil sheet. The guide piece is configured to be detachably held and elastically deformed by coming into contact with the clamp piece when releasing the lock of the stencil sheet, and further, the plate cylinder is brought into contact with the rotating clamp piece. From the upper position to the upper position of the plate discharging means It is characterized by providing a deformed or moving guide member without interfering with the rotation of the clamp pieces.

[Action]

According to the stencil printing apparatus of the first aspect, the end of the stencil sheet fed above the locking position of the plate cylinder is guided from above by the guide pieces. 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. However, when the plate cylinder is rotated, the guide piece is easily released from the clamp piece. Exit.

According to the stencil printing apparatus of the second aspect, the clamping operation at the time of plate printing is the same as the apparatus of the first aspect. When the clamp piece is opened at the time of plate discharging, the rotating clamp piece contacts the guide piece from below and deforms the guide piece elastically. During this time, the released end of the stencil sheet is guided from above by a guide piece or a clamp piece. When the clamp piece and the guide piece are separated, the guide piece returns to its original shape and returns downward to press the stencil sheet. Thereafter, the plate cylinder rotates to feed the end of the stencil sheet toward the plate discharging means. The end of the stencil sheet which has come off from the guide piece with the rotation of the plate cylinder is guided by the guide member until it reaches the plate discharging means.

〔Example〕

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

First, the present embodiment is a rotary stencil printing apparatus 1 having a plate making device 2 and a plate discharging device 25. FIG. 1 is a sectional view showing a schematic configuration thereof, and FIG. .

In the figure, reference numeral 3 denotes 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 stencil retaining device 4 for selectively retaining one end of the stencil paper S on a part of the outer peripheral surface, and is shown in the drawing. The motor is rotated clockwise in the figure around its own central axis by an electric motor that is not provided.

A squeegee roller 10 and a doctor rod are provided inside the plate cylinder 3.
An ink supply device including an ink supply pipe 11 and an ink supply pipe 12 is provided. The ink supply device supplies printing ink to the inner peripheral surface of the plate cylinder 3 according to the rotation of the plate cylinder 3. A stencil sheet S having one end locked to the plate cylinder 3 by the stencil locking device 4 is wound around the outer peripheral surface of the plate cylinder 3 by virtue of the viscosity of the printing ink. A press roller 13 is provided at a portion opposed to the squeegee roller 10 with the plate cylinder 3 interposed therebetween, that is, below the plate cylinder 3. The stencil printing is performed by pressing against the surface and cooperating with the plate cylinder 3.

Next, the base paper printing apparatus 4 will be described in detail. First,
A plate mounting seat portion 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 portion 5 is a flat surface, and a belt-shaped magnet plate 6 is disposed on both sides of the upper surface 5a in the circumferential direction of the plate cylinder 3 so that the central axis of the plate cylinder 3 coincides with the longitudinal direction. , 7 are embedded and fixed, respectively. The magnet plates 6 and 7 are made of permanent magnets having appropriate flexibility like a rubber magnet having a multipolar structure, and the outer surface (upper surface) is flush with the upper surface 5 a 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 and at both ends in the direction of the central axis of the plate cylinder 3, respectively. A pivot 8 integrally provided with a band-shaped clamp piece 9 is rotatably engaged with the bearing bracket 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, as shown in FIG. 1 and FIG. 2, the clamp piece 9 is in a first state (clamp state) magnetically attracted to one of the magnet plates 6 and in FIG. 5 and FIG. As shown in FIG. 3, the pivot shaft is separated from a second state (unclamped state) which is separated from the magnet plate 6 and is magnetically attracted to another magnet plate 7 by a rotational displacement of about 180 °. 8 can be rotated.

A driven gear 8b is attached to one end of the pivot 8.
A driven gear (not shown) is selectively meshed with the driven gear 8b, whereby the clamp piece 9 is rotated between the clamped state and the unclamped state. It has become. If a more detailed description of the driving structure of the clamp piece 9 is required, please refer to Japanese Patent Application No. 57-207217.

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

The plate making device 2 is provided between the base paper storage unit 14 and the plate cylinder 3. The stencil making device 2 has a thermal head 15 and a platen roller 16 as a thermal stencil making device. The stencil paper S is supplied from the stencil storage unit 14, and the stencil making of the stencil paper S is performed thermally. ing.

A stencil stock device 17 is provided between the plate making device 2 and the plate cylinder 3. The stencil stock unit 17 includes a box-shaped stencil stock unit 18 capable of storing a stencil sheet S having a length corresponding to a number of stencil sheets S in a meander shape,
A stencil feed roller 19 for feeding the stencil sheet S from the stencil stock section 18 to the stencil stock section 18, and a stencil feed roller 20 for sending the stencil sheet S from the stencil stock section 18 to a stencil cutting device 21 described later
And

A stencil cutting device 21 is provided between the stencil delivery roller 20 of the stencil stock device 17 and the plate cylinder 3. The stencil cutting device 21 has a cylindrical rotary blade 23 having a helical blade portion 22 on the outer peripheral surface, and a flat blade 24 in contact with the rotary blade 23. Cutting is performed.

On the side opposite to the plate making device 2 with the plate cylinder 3 therebetween, a plate discharging device 25 as a plate discharging means is provided. Plate discharging device
Reference numeral 25 has a roller pair 26, a base paper stripping claw 27, and a base paper waste box.

The roller pair 26 includes a metal roller 29 and a rubber roller 30 which are respectively supported by a lower rotating shaft and an upper rotating shaft provided at the entrance of the base paper disposal box 28 so as to be parallel to the axis of the plate cylinder 3 and are engaged with each other. And The metal roller 29 is driven to rotate clockwise by a motor 31 in the figure. As shown in the figure, the roller pair 26 is provided at a position very close to the stencil holding device 4 of the plate cylinder 3 at the plate discharging position on the side opposite to the stencil cutting device 21.

The base paper stripping claw 27 is pivotally supported at its base end 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. . As described above, the base paper stripping claw 27 is rotated between the base paper stripping position close to the plate cylinder 3 and the retracted position rotated counterclockwise around the pivot 32 from the base paper stripping position. It is designed to be driven dynamically.

Next, a stencil sheet that changes in accordance with the rotation of the clamp piece 9 is located above the plate cylinder 3 and at a position where it contacts the clamp piece 9 that rotates at the plate discharging position shown in FIG. Guide member 40 is provided. The phrase “transition following the rotation of the clamp piece 9” means that the guide member 40 deforms or moves without hindering the rotation of the clamp piece 9. In the present embodiment, the guide member 40 is formed of a flexible member, and the guide member 40 is deformed by the rotating clamp piece 9. As shown in FIG. 2, the guide member 40 is a plurality of strip-shaped members, and one edge of the base paper cutting device 21 side is fixed to the case 23a of the rotary blade 23, and the plate discharging device 25 side. Is movably disposed without being fixed in the base paper waste box 28. If a more detailed description of the structure of the 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 having one ends fixed to the case 23a, and their free ends extend above the locking position of the stencil sheet S. That is, in a state where the stencil retaining device 4 is set at the highest position of the plate cylinder 3, the stencil sheet S is clamped between the clamp piece 9 and the stencil sheet 9 in the operation area of the clamp piece 9. A free end of the guide piece 50 is set at a position above the upper surface 5a of the guide piece 5. As shown in FIG. 2, the pair of guide pieces 50, 50 are disposed outside the magnet plate 7 when viewed from above, and come into contact with both sides of the rotating clamp piece 9, respectively. Is configured. Also, as shown in FIG. 3, the upper surface of the plate mounting seat 5
A concave portion 51 into which the guide piece 50 pressed by the rotating clamp piece 9 enters is formed in a portion of the 5a facing the guide piece 50. The outer shape of the concave portion 51 has a shape conforming to the free end of the guide piece 50, and its depth is slightly larger than the total dimension of the thickness of the guide piece 50 and the thickness of the stencil sheet S.

Next, the operation and effect of the above configuration will be described with reference to FIGS.
This will be described with reference to the drawings.

At the time of stencil printing, initially, the stencil sheet stock unit 18 does not have the stencil sheet S, and the stencil sheet S directly passes from the stencil feed roller 19 to the stencil feed roller 20, and the leading end thereof reaches the stencil cutting device 21. In this state, when an image information signal is given to the thermal head 15 of the plate making apparatus 2 and plate making is started, the stencil feeding roller 19 is driven to rotate, and the stencil sheet S, which has been stenciled, is transferred to the stencil stock section as the plate making progresses. It is sent into 18.

When the stencil making for one sheet, in other words, the length for one time necessary for printing is completed, the stencil feed roller 20 is driven to rotate, whereby the leading end of the stencil sheet S is moved to the clamp piece 9 of the plate cylinder 3. Sent.

As shown in FIG. 4, the stencil sheet S fed above the locking position on the plate cylinder 3 is guided by the guide piece 50 and its upper limit position is regulated even if the stencil sheet S is warped upward. Therefore, there is no possibility that the clamp piece 9 is out of the operation area and cannot be clamped.

As shown in FIG. 5, the clamp piece 9 rotates counterclockwise in the figure to be magnetically attached to the magnet plate 7, and the stencil sheet 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 plate 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 into the concave portion 51 of the plate mounting seat 5, and the space defined by the concave portion 51 and the clamp piece 9 is formed. Is held together with the end of the stencil sheet S.

At this time, although not shown, the tip of the clamp piece 9 contacts the lower surface of the guide member 40, and deflects the guide member 40 upward. That is, the guide member 40 can be deformed following the rotation of the clamp piece 9 for locking the stencil sheet S, and does not hinder the operation of the clamp piece 9. Also,
Since the guide member 40 is provided immediately above the guide piece, even if the leading end of the stencil sheet S comes off the guide piece 50 for some reason and flies upward, the leading end of the stencil sheet S Are reliably guided over the entire width.
Therefore, the leading end of the stencil sheet S does not protrude above the leading end of the clamp piece 9.

Next, when the locking of the stencil sheet S by the clamp pieces 9 is completed, the plate cylinder 3 is driven to rotate clockwise in the figure. Since the guide piece 50 is not sandwiched between the clamp piece 9 and the plate mounting seat 5, if the plate cylinder 3 rotates, it can easily come out of the recess 51 without resistance as shown in FIG. Then, the stencil sheet S is applied to the plate cylinder 3 with the rotation of the plate cylinder 3. When the stencil sheet S corresponding to the length of one sheet necessary for printing is wound around the plate cylinder 3, the rotation of the stencil delivery roller 20 is stopped, and the stencil cutting device 21 is driven to cut the stencil sheet S. Is done. As a result, the stencil sheet S on the plate cylinder 3 is completely formed, and the stencil sheet processing is performed by rotating the plate cylinder 3 continuously.

Next, a plate discharge command is instructed from an operation unit (not shown),
Alternatively, when the next stencil printing process is instructed, the stencil sheet S wound and mounted on the outer peripheral surface of the plate cylinder 3 is removed from the plate cylinder 3 to perform plate discharging.

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

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 the stencil sheet S that has begun to curl upward is forced from above by the force. Press down. If the stencil sheet S is extremely curled, the end of the stencil sheet S is greatly deformed at the moment when the clamp piece 9 is released, and the stencil sheet S is entangled, and the guide member 40 located above may not be able to restrict the deformation. In the present embodiment, however, the stencil sheet S that has begun to curl is pressed by an elastic force immediately after being released by the guide piece 50 linked to the clamp piece 9. This solves the conventional problem that the edges of the stencil sheet S are greatly curled at once when the clamp is released, so that the stencil sheet S is not applied to the stencil discharging device 25.
Then, after the stencil sheet S comes off the guide piece 50 with the rotation of the plate cylinder 3, the stencil sheet S is guided by the guide member 40 and reliably sent to the stencil discharge device 25.

Even during the above-described clamp release operation, the tip of the clamp piece 9 contacts the lower surface of the guide member 40, but does not hinder the rotation of the clamp piece 9 since the guide member 40 bends upward.

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 clockwise as viewed in FIG. . As a result, the stencil sheet S attached to the outer peripheral surface of the plate cylinder 3 is
One end thereof is peeled off from the plate cylinder 3 by the rotation of the plate cylinder 3 by the base paper stripping claw 27, guided by the tip of the base paper stripping claw 27, and enters between the metal roller 29 and the rubber roller 30, With the rotation of the metal roller 29 in the clockwise direction as viewed in FIG. 1 and the accompanying rotation of the rubber roller 30 in the counterclockwise direction as viewed in FIG. It is discarded and transported inside.

As described above, according to the stencil printing apparatus of the present embodiment including the guide piece 50, even if the stencil sheet S having a severe upward curl can be used, a reliable mounting can be performed, thereby avoiding the occurrence of printing defects and the like. Is done. Also, at the time of plate discharging, the locked end of the stencil sheet S, which has been released, can be reliably sent to the roller pair 26, so that the roller pair 26 reliably discards and conveys it into the base paper waste box 28, The occurrence of plate discharge failure is avoided.

In the above-described embodiment, the guide piece 50 held between the clamp piece 9 and the plate mounting seat 5 is guided to a key point of the plate mounting seat 5 so that the guide piece 50 can be easily removed by the rotation of the plate cylinder 3. Piece 50
Recess 51 for accommodating therein. However, it goes without saying that such an operation can be realized by other structures. For example, the upper surface of the magnet plate 7 is not flush with the upper surface 5a of the plate mounting seat 5, but the magnet plate 7 projects from the upper surface of the plate mounting seat 5 by a predetermined height. A gap is formed between the end of the piece 6 and the upper surface 5a of the plate mounting seat 5. Then, the guide piece 50 may be held in this gap so as to be detachable. Further, the guide pieces 50 are provided at both ends of the clamp piece 9, but may be provided further inside.

〔The invention's effect〕

According to the first aspect of the present invention, the stencil sheet can be locked by the clamp pieces while guiding the stencil sheet above the locking position, so that the stencil sheet with strong curl can be fixedly locked even if it is securely locked. effective.

According to the second aspect of the present invention, in addition to the above-described effects, the stencil sheet that starts to deform after the clamp is released can be immediately pressed down by the guide piece. There is an effect that no plate discharge can be performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention, FIG. 2 is a plan view of a main part of the embodiment, FIG.
FIGS. 5, 5 and 6 are cross-sectional views of essential parts showing the plate-fixing operation in the embodiment, FIG. 7 (a) is a cross-sectional view taken along the line VII-VII in FIG. 5, and FIG. FIG. 7A is a partially enlarged sectional view, and FIGS. 8, 9 and 10 are plan views of a main part showing a plate discharging operation in the embodiment. S: stencil sheet, 1 ... stencil printing machine, 3 ... plate cylinder, 9 ... clamp piece, 25 ... stencil device as stencil means, 40 ... guide member, 50 ... guide piece.

Claims (2)

(57) [Claims] 1. A stencil sheet having a plate cylinder provided with a rotatable clamp piece on an outer peripheral surface thereof. One end of a fed stencil sheet having been fed is locked by the clamp piece, and the stencil sheet is attached to the plate. In a stencil printing apparatus that performs printing after winding and stenciling around the outer peripheral surface of a cylinder, the stencil sheet is extended above a locking position of the stencil sheet in an operation area of the clamp piece to guide the stencil sheet from above,
A stencil printing apparatus, further comprising a guide piece that is detachably held between the clamp piece that rotates to lock the stencil sheet and a locking position of the stencil sheet. 2. A stencil sheet having a plate cylinder provided with a rotatable clamp piece on an outer peripheral surface, one end of a fed stencil sheet having been fed is locked by the clamp piece, and the stencil sheet is attached to the plate cylinder. A stencil printing machine that wraps the stencil sheet around the outer peripheral surface of the stencil sheet and peels off the stencil sheet from the plate cylinder by a stencil discharging means after printing, wherein the stencil sheet is located in an operation area of the clamp piece so as to guide the stencil sheet from above. When the stencil sheet is locked, the stencil sheet is extended above the locking position of the stencil sheet. The stencil sheet is detachably held between the clamp piece and the locking position of the stencil sheet. When releasing the stop, the guide piece of the stencil paper which is elastically deformed by contacting the clamp piece, and the clamp piece from the upper position of the plate cylinder in contact with the rotating clamp piece to the upper position of the plate discharging means. Deformation without hindering rotation Or stencil printing apparatus characterized by comprising a guide member to move.