JP2808269B2 - Screen printing stroke correction device for cylinder type screen printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder which is rotated in a state where printing paper is clamped along an outer peripheral surface, and a squeegee from which a printing plate is moved by a squeegee on a screen plate which is run in synchronization with the rotation of the cylinder. In a cylinder type screen printing machine that performs printing by printing, the printing travel length by rotation of the cylinder and the printing stroke by travel of the screen plate are completely synchronized and adjusted according to each different thickness of printing paper. The present invention relates to an apparatus for correcting a printing stroke of a screen plate in a cylinder type screen printing machine capable of performing printing accurately aligned with a sheet.

[0002]

2. Description of the Related Art A cylinder type screen printing machine is capable of performing multicolor printing with a relatively simple mechanism by replacing a screen plate, while an offset printing machine capable of performing multicolor printing is mechanically complicated. They are commonly used because of their simplicity. In this cylinder type screen printing machine, the supplied printing paper is clamped and held so as to be wound along the outer peripheral surface of a cylindrical cylinder which is a printing cylinder, and is applied to the surface of the printing paper so as to synchronize with the rotation of the cylinder. The printing is performed on the surface of the printing paper by pressing ink with a squeegee from above the screen plate while moving the screen plate in contact.

[0003] In this printing operation, however, the travel range of the screen printing plate is constant, so if the thickness of the printing paper is large or small, if the printing paper is thick, the outer diameter of the entire cylinder including the printing paper is required. The printing pattern shrinks and shrinks in the running direction of the screen plate because the printing pattern becomes large.On the contrary, when the printing paper is thin, the printing pattern is enlarged and enlarged because the outer diameter of the entire cylinder including the printing paper becomes small. It becomes.

In order to solve such a drawback, conventionally, the cylinder initially set when the printing paper is wound by slightly reducing the outer diameter of the cylinder itself in consideration of the thickness of the printing paper to be clamped and held. There is a first method for making the outer diameter. Further, as disclosed in Japanese Patent Application Laid-Open No. 7-81033, a cylinder motor serving as a rotation drive source of a cylinder and a screen drive motor serving as a drive source for driving a screen plate are separately provided, and the difference in the thickness of the printing paper is provided. There is a second method of speed controlling each of these two motors correspondingly. Further, as described in Japanese Patent Publication No. 7-80294, an inner support portion for the screen support and an outer support portion for the inner support portion which are relatively movable in the reciprocating direction of the screen plate so as to have an inner / outer double frame structure. A correction element that interposes a conversion element between the converter and the displacement element in the direction that intersects the reciprocating direction of the screen plate to the conversion element is arranged over the moving range of the conversion element, and converts the correction displacement action in the cross direction. There is a third method in which the difference between the printing stroke length on the screen plate side and the printing travel length on the printing paper side is absorbed and corrected by applying it to the inner support portion via the body.

[0005]

However, according to the first method, it is very difficult to change the outer diameter of the cylinder itself in accordance with the thickness of the printing paper. It is not practical to prepare these cylinders in advance, and even if they are prepared, their replacement is extremely troublesome. According to the second method, since the control is performed for each of the two motors, the synchronization adjustment is troublesome. If the operation is performed for a long time in the case where a slight shift occurs, the print pattern is distorted as a result. Is what happens. In particular, when the printing speed is increased, it is extremely difficult to synchronize between the two motors, so that the printing speed cannot be increased beyond a certain speed. According to the third method, since the correcting bodies are arranged on the left and right sides of the inner supporting portion and are tilted with respect to the inner supporting portion, the same correction value is set by a tilting operation synchronized on both the left and right sides. Otherwise, the displacement may be different between the left and right sides of the inner support portion, which may cause distortion during printing. Therefore, setting adjustment of the synchronized tilt angle on the left and right sides is extremely troublesome.

Accordingly, the present invention has been made in view of the above-described various circumstances, and has been developed in such a manner that the thickness of a printing paper on which printing is performed along the outer peripheral surface of a cylinder and the printing paper are expanded by pressing a squeegee. When correcting the travel distance of the printing stroke on the screen plate in response to the screen mesh, positioning in multi-color printing, etc., it is possible to adjust and set it reliably even though it is an extremely simple mechanism, so that the printing pattern does not shift. It is an object of the present invention to provide a screen plate printing stroke correction device in a cylinder type screen printing machine.

[0007]

In order to achieve the above-mentioned object, according to the present invention, the printing paper P is reciprocated in the front-rear direction in synchronization with the rotation of the cylinder 10 which is intermittently rotated while being clamped. When printing a predetermined print pattern on the surface of the printing paper P via the screen plate S supported by the screen plate support mechanism 30 as described above, the screen plate support mechanism 30 moves in the printing direction in synchronization with the rotation of the cylinder 10. A traveling outer frame 31 mounted on and supported by a main body frame 2 of the cylinder type screen printing machine main body 1 so as to be able to move back and forth along the traveling outer frame 31;
Slide correction inner frame 35 which is slidably disposed back and forth with respect to and fixes the screen plate S.
The slide is performed by adjusting the thickness corresponding to the thickness of the printing paper P on the correction swing arm 51 which is swung about a substantially central portion of a rear frame portion of the traveling outer frame 31 as the traveling outer frame 31 moves forward. The traveling outer frame 3 via the freely adjustable advance / retreat adjusting rod 52
And a correcting means 40 for correcting and moving the slide correction inner frame 35 in the forward and backward directions during the forward running.
The running outer frame 31 is regulated by guide means 32 laid on the upper horizontal portion of the main body frame 2 and is disposed so as to be able to move forward and backward, and the slide correction inner frame 35 is provided on both left and right sides of the running outer frame 31. The slide guide 34 provided on the inner side of the unit can be configured to be supported so as to be able to advance and retreat so as to be exactly along the printing direction of the traveling outer frame 31. The correcting means 40 extends along the horizontal direction on the rear frame portion of the traveling outer frame 31 so as to be rotated in accordance with the traveling amount of the traveling outer frame 31 when moving in the printing direction in synchronization with the rotation of the cylinder 10. Drive input shaft 41 supported
The rotation of the drive input shaft 41 causes the worm portion 46 to rotate.
A drive output shaft 48 supported vertically along a rear frame portion of the running outer frame 31 so as to be driven and rotated through the shaft, and a correction swing arm 51 which is horizontally swung by the rotation of the drive output shaft 48. And a reciprocating adjustment rod 52 which is slidably adjustable along the length direction of the correction swing arm 51 itself and is swingably connected to the slide correction inner frame 35. A drive input shaft 41 of the correction means 40 is provided with a correction pinion 43 meshing with a correction rack 42 laid on the upper part of the main body frame 2 before and after along the printing direction.
The running outer frame 31 is supported by bearings 44 fixed to the rear frame side surface so as to be rotated at a reduced speed. Further, the base of the advance / retreat adjusting rod 52 is the correction swing arm 51.
Above, it is connected to the traveling outer frame 31 side by being slidably and oscillatably linked along the correction swing arm 51, while the leading end is provided with an adjusting portion 55 at the rear frame of the slide correction inner frame 35. Are connected to the slide correction inner frame 35 side by being slidably connected via a. The adjusting section 55 advances and retreats an adjusting screw 57 which is screwed so as to be able to advance and retreat in a direction substantially orthogonal to the printing direction between the left and right screw plates 56 erected substantially at the center of the rear frame portion of the slide correction inner frame 35. It can be configured by screwing to the tip of the adjustment rod 52 so as to be able to advance and retreat.

In the apparatus for correcting the printing stroke of the screen plate in the cylinder type screen printing machine according to the present invention having the above-described configuration, the supplied printing paper P is clamped and held in synchronization with the rotating cylinder 10. As the screen plate S held by the screen plate support mechanism 30 moves forward, a predetermined print pattern is printed on the surface of the printing paper P. At this time, the screen plate support mechanism 3
At 0, the screen plate S, which is moved by a predetermined printing stroke along with the travel of the traveling outer frame 31 by the operation of the correction means 40 adjusted according to the thickness of the printing paper P, is moved inside the traveling outer frame 31. Then, the slide correction travel is performed via the slide correction inner frame 35, and an accurate print pattern is realized in accordance with a shift in the print direction generated on the surface of the printing paper P. In the correction means 40, the correction swing arm 51 is supported by the drive input shaft 41, the worm portion 46, and the drive output shaft 48, which are rotated as the travel outer frame 31 travels, using the rear frame portion of the travel outer frame 31 as a fulcrum. When swinging, the forward / backward adjustment rod 52 having a base moves forward / backward on the correction swing arm 51 in the printing direction, and causes the slide correction inner frame 35 to slide relative to the travel outer frame 31. The adjustment screw 57 in the adjustment section 55 is used to rotate the correction swing arm 51
When the correction swing arm 51 is swung at the same angle, the advance / retreat adjustment rod 52 is slid.
The slide movement amount along the printing direction of the inner frame 35 of the slide correction via the front end of the second, that is, the adjustment unit 55 is changed.
At this time, the base of the advance / retreat adjustment rod 52 is
The movement amount of the tip of the advance / retreat adjusting rod 52 is increased at a position separated from the swing center position of the correction swing arm 51 itself, and conversely, at a position close to the swing center position of the correction swing arm 51 itself. The amount of movement of the tip of the adjustment rod 52 is reduced. This change of the slide movement amount is performed by holding the printing stroke of the screen plate S on the printing pattern on the surface of the screen plate S and the outer surface of the cylinder 10 through the slide correction inner frame 35 with respect to the traveling outer frame 31 traveling forward. The distortion caused by the difference in stroke along the print direction between the print pattern and the print pattern to be printed on the paper P is corrected.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a cylinder type screen printing machine main body. As shown in FIG. 1, an intermittently rotated cylinder 10 as a printing cylinder for holding the printing paper P supplied from the paper feeding unit 3 via a clamping means 11 and holding the printing paper P so as to wind it around its own outer peripheral surface. When,
The screen plate S supported by the screen plate support mechanism 30 so as to reciprocate in the front-rear direction in contact with the surface of the printing paper P in synchronization with the rotation of the cylinder 10, and ink is pressed from above the screen plate S. The printing apparatus includes a squeegee 6 for printing a predetermined print pattern on the surface of the printing paper P, and a squeegee unit 5 having a doctor 7 for leveling ink after printing, and discharges the printing paper P released from the cylinder 10 after printing is completed. The paper is discharged to the paper unit 4.

The cylinder 10 is, as shown in FIGS.
A forward / reverse transmission means 13 is supported on the upper part of the main body frame 2 through a cylinder shaft 12 so as to be intermittently rotatable, and is driven by a driving force of a driving source (not shown) such as a motor.
The rotation is controlled by the intermittent rotation means 21 provided on the cylinder shaft 12 so as to be driven to rotate in one direction toward the sheet discharge section 4. The transmission means 13 includes a driving rack 14 which moves forward and backward by a driving source, a driving pinion 15 which meshes with the driving rack 14, and a driving shaft 16 which is fixed to the main body frame 2 and which is fixed to the driving shaft 16. The left and right rotation transmission meshing with the left and right cylinder gears 18 freely rotatably supported on the cylinder shaft 12 so as to mesh with the traveling rack 33 on the lower surface of the traveling outer frame 31 of the screen plate supporting mechanism 30 so that the screen plate S reciprocates. It consists of a gear 17. Intermittent rotation means 2
1 has a part of teeth on its outer peripheral surface cut off so as to intermittently mesh with one of the rotation transmission gears 17, and a cylinder rotation gear 22 fixed to the cylinder shaft 12 and a main body frame 2 in the front-rear direction. A cylinder stopper lever 24, which is swingably supported and is freely engageable with a cam follower 23 attached to the side surface of the cylinder rotating gear 22 by a notch 25 formed at the upper end, and a cylinder via a transmission means 13 for normal rotation. When the cylinder 10 is rotated in the printing direction, the engagement is released, and immediately before the normal rotation of the cylinder 10 is completed, the cylinder stopper lever 24 is swung in the front-rear direction so as to engage the notch 25 with the cam follower 23 during the reverse rotation. And part 26.

Accordingly, when the cylinder 10 is driven to rotate in the forward direction via the transmission means 13 by the driving force of the driving source, the rotation transmission gear is released in a state where the engagement by the cylinder stopper lever 24 in the intermittent rotation means 21 is released. 17, while being rotated in the printing direction by the cylinder rotating gear 22, the rotation transmitting gear 17, the cylinder gear 18
As a result, the screen plate S is also forward-traveled in synchronization via the traveling outer frame 31. Further, when the cylinder rotation gear 22 is engaged by the cylinder stopper lever 24 when the cylinder rotation gear 22 is driven to rotate in the reverse rotation direction, the cut portion on the outer periphery of the cylinder rotation gear 22 does not mesh with the rotation transmission gear 17 and the rotation of the cylinder 10 is stopped. Rotation transmission gear 1
7. The screen plate S is caused to travel backward by the cylinder gear 18 via the traveling outer frame 31.

On the other hand, the screen plate S is detachably supported by the screen plate support mechanism 30 as described above, and the screen plate support mechanism 30 itself, as shown in FIG. A running outer frame 31 mounted and supported on the upper part of the main body frame 2 so as to be able to advance and retreat forward and backward so as to follow the running outer frame 3 within the running outer frame 31
1, a slide correction inner frame 35 in which the screen plate S is fixed so as to be freely slidable back and forth, and a correction rocking which is rocked as the running outer frame 31 moves forward. A correction for moving the slide correction inner frame 35 in the forward / backward direction during the forward traveling of the traveling outer frame 31 via the forward / backward adjusting rod 52 slidably supported on the arm 51 in accordance with the thickness of the printing paper P. Means 40.

That is, in the correction means 40, as shown in FIG. 4, the printing stroke on the screen plate S corresponding to the running length during printing on the printing paper P is L, the outer diameter of the cylinder 10 is D, and the printing paper P is When the thickness is represented by the following equation, L = (D + 2t) π. .Times..times..times..times..times..times..times..times..times. In the following, L ± 2Δtπ = ｛D + 2 (t ± Δt)｝ π Equation 2Δtπ, which is a variation, may be set to the print stroke L as a correction value. In the present invention, the travel outer frame 31 is disposed between the travel outer frame 31 and the slide correction inner frame 35 mounted and supported on the travel outer frame 31 so as to be relatively movable with respect to the travel outer frame 31. The attached correction means 40 is connected to the slide correction inner frame 35, and the correction value 2Δtπ which fluctuates depending on the thickness t of the printing paper P is set and adjusted by the correction means 40, and the slide is performed while the traveling outer frame 31 is traveling forward. The correction inner frame 35 is to be corrected and moved relatively in the forward and backward directions.

Guide means laid on the upper horizontal portion of the main body frame 2 of the cylinder type screen printing machine main body 1 so as to extend along the paper feeding direction of the printing paper P supplied from the paper feeding section 3. The traveling outer frame 31 itself shown in the drawing is formed in a square pipe so as to have a U-shape in a plane where the front side of the printing paper P in the printing direction is open. It is framed by a material (see FIG. 1). A running rack 33 is formed on the lower surface on both left and right sides of the running outer frame 31 (see FIGS. 2 and 3), and meshes with the left and right cylinder gears 18 of the transmission means 13. The forward and backward running of the printing direction is performed by the rotation of the motor 18 in the forward and reverse directions.

The slide correction inner frame 35 is supported by slide guides 34 attached to the inner surfaces of the left and right side frame portions of the traveling outer frame 31 so as to be able to advance and retreat so as to be exactly along the printing direction of the traveling outer frame 31. The slide rails laid on the inner surfaces of the left and right frame portions of the frame 31 are engaged with U-shaped sliders having cross sections provided on the outer surfaces of the left and right frame portions of the slide correction inner frame 35. The slide correction inner frame 35 itself is framed by a square pipe so as to be substantially rectangular when viewed from a plane, and has, for example, an air cylinder operated clamp means 36 which supports the screen plate S so as to be vertically movable. ing.

A correcting means 40 is provided on the rear frame portion of the running outer frame 31 so as to be rotated in accordance with the amount of travel of the running outer frame 31 when moving in the printing direction in synchronization with the rotation of the cylinder 10 in the horizontal direction. A drive input shaft 41 supported along
A drive output shaft 48 supported vertically along a rear frame portion of the traveling outer frame 31 so as to be rotated through the worm portion 46 following the rotation of the drive input shaft 41, and a drive output shaft 48.
Swing arm 5 which is swung in the horizontal direction by the rotation of
1 and an advance / retreat adjusting rod 52 that is slidably adjustable along the length direction of the correction swing arm 51 itself and is swingably connected to the slide correction inner frame 35 (see FIG. 7). .

The drive input shaft 41 is rotated at a reduced speed by a correction pinion 43 which meshes with a correction rack 42 laid forward or backward on one of the left and right portions along the printing direction on the upper part of the main body frame 2 so as to be rotated at a reduced speed. 31 is supported via a bearing 44 fixed to the side surface of the rear frame portion (see FIGS. 1 and 5). When the rotation of the drive input shaft 41 is converted into rotation of the drive output shaft 48 by substantially orthogonally transforming the rotation shaft, the input shaft and the output shaft are provided in the illustrated example, and the worm portion 46 is incorporated. The input shaft of the worm box 45 fixed to the rear frame portion side surface of the traveling outer frame 31 is connected via a coupling 47, and the output shaft of the worm box 45 is used as a drive output shaft 48. . Of course, the drive output shaft 4 from the drive input shaft 41
The direction change of the rotation axis of the rotation action with respect to 8 is not performed by the worm box 45 in the illustrated example, but is performed by the drive input shaft 4.
It is needless to say that the drive output shaft 48 can be connected to the drive output shaft 48 directly through the worm portion 46.

In the drawing, the correction swing arm 51 has a substantially groove shape in a cross section open at the top, and an upper groove portion of a lever shaft 49 which is screwed into a hollow drive output shaft 48. One end of the correction oscillating arm 51 is fitted and screwed and fixed, so that the rotation of the drive output shaft 48 itself causes the correction oscillating arm 51 to oscillate (see FIGS. 7 and 8). ).

The advance / retreat adjusting rod 52 has a substantially T-shape in a plane as shown in the figure, and the base, which is a narrow portion, is slidable on a slide guide 53 fitted in a groove at the upper part of the correction swing arm 51. And a substantially groove-shaped roller follower base 54 having an open lower section.
While being connected to the traveling outer frame 31 side by being swingably connected to
The slide correction inner frame 35 is slidably connected to the upper surface of the rear frame through the slide correction inner frame 35 to connect to the slide correction inner frame 35 (see FIGS. 5 and 6). Advance / retreat adjustment rod 5
The swingable connection to the two roller follower bases 54 is such that a base is fitted into a shaft bolt that stands on the roller follower base 54 itself, and then a nut from above the roller follower base 54 is screwed into the shaft bolt. Further, as shown in FIG. 5, the adjusting portion 55 can move forward and backward in a direction substantially perpendicular to the printing direction between the left and right screw plates 56 provided on the upper surface of the substantially central portion of the rear frame portion of the slide correction inner frame 35. An adjusting screw 57 with a grip, which is screwed, is screwed into a female screw formed on a screw block fixed to the back surface of the distal end portion of the advance / retreat adjusting rod 52. Reference numeral 58 in the figure is a dimensional scale indicating the correction value (2Δtπ) set when the adjustment screw 57 is rotated to correspond to the thickness of the printing paper P, for example. Similarly, reference numeral 59 denotes an adjustment correction base attached to the outer surface of the rear frame portion of the slide correction inner frame 35 so as to support the adjustment portion 55 to which the tip of the advance / retreat adjustment rod 52 of the correction means 40 is connected. Provided if necessary.

As shown in FIG. 5, in the correcting means 40, when the adjustment screw 57 is rotated to slide the advance / retreat adjustment rod 52 at the leading end thereof in a direction substantially perpendicular to the printing direction for the printing paper P, the advance / retreat adjustment rod 52 is moved. Similarly, the base of 52 moves in parallel, and the base of the advance / retreat adjusting rod 52 is set at a predetermined length from the swing center position of the correction swing arm 51. When the traveling outer frame 31 moves back and forth in the printing direction, the driving input shaft 41, the worm portion 46, and the driving output shaft 48 driven by the correction pinion 43 meshing with the correction rack 42 accompanying the traveling of the traveling outer frame 31.
When the correction oscillating arm 51 is oscillated via the rotation of the correction oscillating arm 51 as shown in FIG. The reciprocation adjusting rod 5 depends on the position on the
The length of the extruded slide at the leading end of No. 2 is different, and the slide length, which is the amount of movement of the slide correction inner frame 35 with respect to the traveling outer frame 31, corresponds to the thickness of the printing paper P wound around the cylinder 10. Value (2Δtπ)
Is set as

The correction value by the correction means 40 is such that when the traveling outer frame 31 advances in the printing direction, the base of the advance / retreat adjusting rod 52 is slid so that the sliding correction inner frame 35 slides along the advance direction. Correction swing arm 51
The outer diameter of the entire cylinder 10 when the printing paper P is moved along the outer peripheral surface is smaller than the outer diameter of the cylinder 10 which is initially set by being located forward with respect to the swing center position in It is assumed that it is increased. However, when the printing paper P is made smaller along the outer diameter of the initially set cylinder 10 even when the printing paper P is made to follow the outer peripheral surface, the base of the advance / retreat adjusting rod 52 is moved with respect to the swing center position of the correction swing arm 51. It can also be located rearward. In this case, when the traveling outer frame 31 moves forward in the printing direction, the slide correction inner frame 35 slides along the retreating direction.

An example of use in the embodiment of the present invention configured as described above will be described. In the cylinder type screen printing machine main body 1 to which a predetermined printing paper P is supplied from the paper feeding unit 3, When the printing paper P is clamped and held by the clamping means 11 and the cylinder 10 is rotated, the rotation of the cylinder 10 causes the running outer frame 31 of the screen plate support mechanism 30 to advance in the printing direction in synchronization with the squeegee. The squeegee 6 in the unit 5 descends, and prints on the surface of the printing paper P via the screen plate S held by the slide correction inner frame 35 of the screen plate support mechanism 30. At this time, the adjusting screw 57 of the correcting means 40 is rotated in accordance with the thickness of the printing paper P, and the advance / retreat adjusting rod 52 is slid on the correcting oscillating arm 51 so that the correcting oscillating arm 51 is moved.
Is set at a predetermined position from the center position of the swing.

Then, in the screen plate support mechanism 30, the slide correction inner frame 35 is slidably held in the printing direction with respect to the traveling outer frame 31, and the slide correction inner frame 35 is attached to the traveling outer frame 31 by the correcting means. As a result of being connected through the drive frame 40, the swing arm can be corrected through deceleration rotation by the drive input shaft 41, the worm portion 46, the drive output shaft 48, and the like of the correction means 40 accompanying the forward running of the running outer frame 31 itself. 51 is swung. Along with the swing of the correction swing arm 51, the base is connected to the traveling outer frame 31 side by being swingably connected to the correction swing arm 51 itself, and the tip end is connected to the slide correction inner frame 35 side. The traveling outer frame 3 which travels forward by swinging the forward / backward adjustment rod 52 to which the
The printing stroke of the slide correction inner frame 35 for 1
The distortion caused by the difference in stroke in the printing direction between the printing pattern on the screen plate S and the printing pattern printed on the printing paper P along the outer peripheral surface of the cylinder 10 is relatively slightly corrected. This is to slide.

The relative sliding movement of the slide correction inner frame 35 with respect to the traveling outer frame 31 is set at a predetermined length from the center of the swing of the correction swing arm 51 by rotating the adjustment screw 57. This corresponds to the length of the moving slide at the tip of the advance / retreat adjusting rod 52. That is, even when the correction oscillating arm 51 oscillates at the same angle, the base of the advance / retreat adjusting rod 52 is moved on the correction oscillating arm 51.
Since the amount of movement of the tip of the advance / retreat adjusting rod 52 is large at a position separated from the swing center position of itself, when the thickness of the printing paper P is thick, the advance / retreat adjusting rod 52 is corrected and swung by rotating the adjusting screw 57. The moving arm 51 is moved to the distal end side and set so as to obtain a large correction value (see FIG. 8A). Further, at a position where the base of the forward / backward adjustment rod 52 is close to the swing center position of the correction swing arm 51 itself on the correction swing arm 51, the forward / backward adjustment rod 52 is provided.
Since the amount of movement of the leading end is small, when the thickness of the printing paper P is thin, the rotation of the adjusting screw 57 causes the advance / retreat adjusting rod 5 to move.
2 is moved to the base side on the correction swing arm 51, and is set so that a small correction value is obtained (see FIG. 8B).

[0025]

Since the present invention is configured as described above, the thickness of the printing paper P on which printing is performed along the outer peripheral surface of the cylinder 10, the screen mesh expanded by pressing the squeegee 6, When the screen plate S is traveled and moved in response to positioning in multicolor printing, the printing stroke amount of the screen plate S can be corrected in accordance with different printing travel lengths on the surface of the printing paper P. In this case, although the mechanism is extremely simple, the adjustment can be surely set, and no deviation occurs in the print pattern.

That is, in the present invention, the screen plate support mechanism is arranged so that the printing paper P is clamped and held on its outer peripheral surface and reciprocated in the front-rear direction in synchronization with the rotation of the cylinder 10 intermittently rotated. When a predetermined printing pattern is printed on the surface of the printing paper P by the screen plate S supported by the screen plate 30, the screen plate supporting mechanism 3
0 is a traveling outer frame 31 mounted and supported on the main body frame 2 so as to be able to advance and retreat back and forth so as to follow the printing direction in synchronization with the rotation of the cylinder 10, and the traveling outer frame 31 A slide correction inner frame 35 slidably disposed and fixing the screen plate S, and a fulcrum about a substantially central portion of a rear frame portion of the traveling outer frame 31 accompanying the forward traveling of the traveling outer frame 31. Oscillating arm 51 oscillated as
A correcting means 40 for correcting and moving the slide correction inner frame 35 in the forward and backward directions during the forward traveling of the traveling outer frame 31 via the forward and backward adjusting rod 52 which is slidably supported in accordance with the thickness of the printing paper P. This makes it possible to easily adjust to a difference in the thickness of the printing paper P due to a change in the position of the advance / retreat adjusting rod 52 due to only one operation.

The running outer frame 31 is restricted by the upper horizontal portion of the main body frame 2 so as to be able to move back and forth, and the slide correction inner frame 35 is provided on the left and right side frame portions of the running outer frame 31 in the printing direction of the running outer frame 31. The slide correction inner frame 35 does not shift left and right in the printing direction with respect to the running outer frame 31 when running in synchronization with the rotation of the cylinder 10 because the slide correction inner frame 35 is This corrects the distortion only in the printing direction.

The correction means 40 is driven by a drive input shaft 41 which is rotated via a correction rack 42 and a correction pinion 43 in accordance with the travel distance of the running outer frame 31, and is driven via a worm 46 by rotation of the drive input shaft 41. A drive output shaft 48 that is driven and rotated, a correction swing arm 51 that is swung in the horizontal direction by the rotation of the drive output shaft 48,
1 is provided with an advance / retreat adjustment rod 52 which is slidably adjustable along itself and is swingably connected to the slide correction inner frame 35 so that the advance / retreat adjustment rod 52 is associated with the travel of the travel outer frame 31. Can be slid in the printing direction,
In addition, since no special control means is provided between them, they are surely linked with each other, have few failures, and their maintenance is extremely easy.

The forward / backward adjusting rod 52 of the correcting means 40 is slidably and slidably connected on the correcting swing arm 51 at its base to be connected to the running outer frame 31 side, and has its tip end at the slide correcting inner frame. Adjusting part 5 on rear frame of 35
5 is connected to the slide correction inner frame 35 side by being slidably connected through the slide correction inner frame 35.
5 can be relatively slid. And the adjustment unit 5
5, the adjusting screw 57 is screwed so as to be able to advance and retreat in a direction substantially perpendicular to the printing direction. Therefore, the rotation operation of the adjusting screw 57 slides and positions the advance / retreat adjusting rod 52 with respect to the correction swing arm 51, and moves forward and backward. The relative slide correction amount of the slide correction inner frame 35 with respect to the traveling outer frame 31 by the adjustment rod 52 itself can be variably adjusted. Therefore, the printing stroke of the slide correction inner frame 35 with respect to the traveling outer frame 31 traveling forward is moved between the printing pattern on the screen plate S surface and the printing pattern to be printed on the printing paper P held on the outer surface of the cylinder 10. The distortion caused by the difference in the stroke along the printing direction caused by the above can be easily corrected by operating the adjustment unit 55.

[Brief description of the drawings]

FIG. 1 is a plan view according to an embodiment of the present invention.

FIG. 2 is a sectional side view of a main part in the same manner.

FIG. 3 is a back sectional view of the same.

FIG. 4 is a schematic side view showing a relationship between a travel length of a printing paper by a cylinder diameter and a printing stroke length of a screen plate.

FIG. 5 is a plan view of a main part in the same manner.

FIG. 6 is a side view of the main part.

FIG. 7 is an exploded perspective view of the correction means.

8A and 8B are schematic plan views illustrating a slide correction amount obtained by the correction unit, where FIG. 8A shows a case where the slide correction amount is large and FIG. 8B shows a case where the slide correction amount is small.

[Explanation of symbols]

L: Printing stroke D: Cylinder outer diameter t: Printing paper thickness Δt: Printing paper fluctuating thickness P: Printing paper S: Screen plate 1: Cylinder type screen printing machine body 2: Body frame 3: Feeding unit DESCRIPTION OF SYMBOLS 4 ... Paper discharge part 5 ... Squeegee unit 6 ... Squeegee 7 ... Doctor 10 ... Cylinder 11 ... Clamping means 12 ... Cylinder shaft 13 ... Transmission means 14 ... Drive rack 15 ... Drive pinion 16 ... Drive shaft 17 ... Rotation transmission gear 18 ... Cylinder Gear 21 ... Intermittent rotation means 22 ... Cylinder rotation gear 23 ... Cam follower 24 ... Cylinder stopper lever 25 ... Notch 26 ... Swinging part 30 ... Screen plate support mechanism 31 ... Running outer frame 32 ... Guide means 33 ... Running rack 34 ... Slide Guide 35 Slide inner frame 36 Clamping means 40 Correcting means 41 Drive input shaft 42 Correction rack 43 ... Correction pinion 44 ... Bearing 45 ... Warm box 46 ... Worm part 47 ... Coupling 48 ... Drive output shaft 49 ... Lever shaft 51 ... Correction swing arm 52 ... Advancing / retreat adjustment rod 53 ... Slide guide 54 ... Roller follower base 55 adjustment part 56 screw plate 57 adjustment screw 58 dimensional scale 59 adjustment correction base

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B41F 15/34-15/36 B41F 15/08 302

Claims (7)

(57) [Claims] A printing paper is clamped and held on a printing paper surface via a screen plate supported by a screen plate support mechanism so as to reciprocate in a front-rear direction in synchronization with rotation of a cylinder intermittently rotated. In a cylinder type screen printing machine for printing a printing pattern, the screen plate support mechanism is mounted on a main body frame of the cylinder type screen printing machine body so as to be able to move back and forth so as to be along a printing direction in synchronization with rotation of a cylinder. A traveling outer frame, a sliding correction inner frame that is slidably mounted on the traveling outer frame so as to be able to slide back and forth with respect to the traveling outer frame, and that fixes the screen plate. Adjustable in accordance with the thickness of the printing paper on a swingable arm that swings around the center of the rear frame of the running outer frame. Correction means for moving the slide correction inner frame in the forward and backward directions while the traveling outer frame is traveling forward through the forward and backward adjusting rods. apparatus. 2. The printing stroke of a screen plate in a cylinder type screen printing machine according to claim 1, wherein the running outer frame is regulated by guide means laid on an upper horizontal portion of the main body frame and is disposed so as to be able to move back and forth. Correction device. 3. The slide correction inner frame according to claim 1 or 2, wherein the slide correction inner frame is supported by slide guides attached to left and right side frame portions of the travel outer frame so as to be able to advance and retreat so as to be exactly along the printing direction of the travel outer frame. A printing stroke correction device for a screen plate in a cylinder type screen printing machine. 4. A correcting means is provided along a horizontal direction on a rear frame portion of a traveling outer frame so as to be rotated in accordance with a traveling amount of the traveling outer frame when moving in the printing direction in synchronization with rotation of the cylinder. A drive output shaft supported vertically by a rear frame portion of a traveling outer frame so as to be driven and rotated via a worm portion by rotation of the drive input shaft, and a drive output shaft. A correcting oscillating arm that is oscillated in the horizontal direction by the rotation of the oscillating arm, and an advance / retreat adjusting rod that is slidably adjustable along the length direction of the correcting oscillating arm itself and is slidably connected to the slide correction inner frame. 4. The printing stroke correction device for a screen plate in a cylinder type screen printing machine according to claim 1, comprising: 5. The drive input shaft is supported by a bearing fixed to the rear frame portion side surface of the traveling outer frame such that the drive input shaft is decelerated and rotated by a correction pinion meshing with a correction rack laid before and after along the printing direction on the upper portion of the main body frame. 5. A printing stroke correction device for a screen plate in a cylinder type screen printing press according to claim 4. 6. The forward / backward adjusting rod has its base connected to the traveling outer frame side by being slidably and oscillatably connected along the correction oscillating arm on the correction oscillating arm. 6. The printing stroke of the screen plate in the cylinder type screen printing machine according to claim 4 or 5, wherein the printing plate is slidably connected to a rear frame portion of the slide correction inner frame via an adjusting portion so as to be connected to the slide correction inner frame side. Correction device. 7. An adjusting unit for adjusting an adjusting screw which is screwed so as to be able to advance and retreat in a direction substantially perpendicular to a printing direction between right and left screw plates provided substantially at the center of a rear frame of the slide correction inner frame. 7. The apparatus according to claim 6, wherein the adjusting rod is screwed to the tip of the adjusting rod so as to be able to advance and retreat.