JP2014061641A - Rotary screen apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary screen apparatus that can minimize damage when a rotary screen cylinder is broken and performs screen printing of high quality.SOLUTION: In a rotary screen apparatus including a rotary screen cylinder 20 having a screen printing plate 20, a squeegee 23 pressing ink out of holes 20d of the screen printing plate to a surface of paper held around a pressure cylinder 11, an ink tank 29, an ink supply pipe 28 supplying ink reserved in the ink tank onto the squeegee, and an ink collection pipe 32 putting ink, flowing out from on the squeegee, back into the ink tank, the rotary screen cylinder is disposed on a side of the pressure cylinder, the squeegee is tilted so as to have one end in its longitudinal direction located above the other end, and while the ink is supplied by the ink supply pipe from the one end side of the squeegee, the ink is collected by the ink collection pipe from the other end side of the squeegee.

Description

  The present invention relates to a rotary screen device that performs screen printing on a sheet.

  As a conventional rotary screen device, for example, there is one disclosed in Patent Document 1.

  According to this, first, in the rotary screen device provided in combination with the offset printing device, the rotary screen cylinder is arranged above the impression cylinder that holds and conveys the sheet on which screen printing is performed. Yes.

  The rotary screen device includes a rotary screen cylinder in which a cylindrical screen plate is supported via a flange between a pair of holders, and a pair of eccentric bearings that rotatably support the pair of holders of the rotary screen cylinder. Driving means including a pair of motors for moving the pair of holders along the trunk axis direction via the pair of eccentric bearings, and moving the pair of holders toward and away from each other along the trunk axis direction. The drive means is driven and controlled to support and release the screen plate, and the screen plate is moved in the barrel axis direction by synchronously moving a pair of holders in the same direction along the barrel axis direction. And a control device that controls the drive of the drive means.

JP 2006-321157 A

  By the way, in the rotary screen device disclosed in Patent Document 1, the rotary screen cylinder is arranged above the impression cylinder, and the pair of holders always apply tension to the screen plate in the cylinder axis direction. ing.

  Therefore, when the rotary screen cylinder is damaged due to aging or interference with other objects, ink or varnish accumulated inside the rotary screen cylinder leaks to the outside and falls on peripheral equipment such as an impression cylinder. There was a problem of damage.

  Moreover, the ink used for a rotary screen apparatus may use a highly volatile ink, and a property will change if the time exposed to external air is long.

  In particular, when the printing area by the rotary screen device is limited to a specific small range, even if the ink is supplied to the inside of the rotary screen cylinder, the hole portion of the screen plate is printed on the sheet and consumed. The missing portion is accumulated without being consumed, and there is a problem that highly volatile ink is exposed to the outside air for a long time.

  Accordingly, an object of the present invention is to provide a rotary screen device capable of minimizing damage when the rotary screen cylinder is broken and capable of performing high-quality screen printing.

In order to achieve such an object, a rotary screen device according to the present invention includes:
A rotary screen cylinder that has a cylindrical screen plate with a plurality of holes formed on its peripheral surface and is rotatably supported and is in contact with the impression cylinder;
A squeegee that abuts the inner peripheral surface of the screen plate and pushes the liquid fed to the inner peripheral surface of the screen plate to the surface of the sheet held by the impression cylinder from the hole;
A tank for storing the liquid;
A liquid supply device for supplying the liquid stored in the tank onto the squeegee;
A liquid recovery apparatus that receives liquid flowing out from the squeegee and returns it to the tank;
In the rotary screen device with
The rotary screen cylinder is disposed on the side of the impression cylinder,
The squeegee is tilted so that one end in the longitudinal direction is positioned higher than the other end, and the liquid supply device supplies liquid from one end side of the squeegee, while the liquid recovery device is the other end of the squeegee. Recover liquid from the side,
It is characterized by that.

Also,
A squeegee angle adjusting device for adjusting an inclination angle of the squeegee is provided.

  According to the rotary screen device of the present invention, since the rotary screen cylinder is disposed on the side of the impression cylinder, the screen printing liquid in the cylinder is exposed to the outside when the rotary screen cylinder is damaged due to aging deterioration of the screen plate. Damage to the peripheral equipment such as the impression cylinder due to scattering can be minimized, increasing the reliability of the device.

  In addition, since the liquid supplied onto the squeegee is always allowed to flow from one end side to the other end side of the squeegee by inclining the squeegee, it is possible to avoid deterioration of the highly volatile liquid and stabilize the characteristics. And high-quality screen printing.

1 is a schematic side view of a rotary screen device according to an embodiment of the present invention. It is an AA arrow line view of FIG. 1 which shows the circulation system path | route of an ink. It is a B arrow line view of FIG. It is explanatory drawing which shows the support structure of a rotary screen cylinder. FIG. 5 is a right side view of FIG. 4. FIG. 5 is a left side view of FIG. 4. It is a figure which shows the support structure of an impression cylinder.

  Hereinafter, a rotary screen device according to the present invention will be described in detail with reference to the accompanying drawings.

  1 is a schematic side view of a rotary screen device showing an embodiment of the present invention, FIG. 2 is a view taken along the line AA in FIG. 1 showing an ink circulation path, and FIG. 3 is a view taken in the direction of an arrow B in FIG. 4 is an explanatory view showing a support structure for a rotary screen cylinder, FIG. 5 is a right side view of FIG. 4, FIG. 6 is a left side view of FIG. 4, and FIG.

  As shown in FIG. 1, in the rotary screen device 10, the rotary screen cylinder 20 is in contact with the side located on the downstream side in the paper (sheet) conveyance direction from the contact position of the impression cylinder 11 with the transfer cylinder 12 ( The paper that is fed from a paper feeding unit (or pre-process processing unit) (not shown) and delivered from the transfer cylinder 12 to the impression cylinder 11 passes through a contact position with the rotary screen cylinder 20. In doing so, screen printing of ink (liquid) is applied to the surface of the paper. The screen-printed paper is delivered to the transfer cylinder or paper discharge cylinder 13 and fed to a post-processing unit (or paper discharge unit) (not shown).

  As shown in FIGS. 2 and 3, the rotary screen cylinder 20 has a support shaft 21 penetrating through the rotary screen cylinder 20 in the cylinder axis direction. Along the support shaft 21 via the bracket 22, the support shaft 21 extends along the support shaft 21. A long plate-like squeegee 23 is supported. Specifically, the base end side of the squeegee 23 is fixedly supported by the bracket 22 via the fixing plate 24 by the bolt 25, and the tip end side of the squeegee 23 is the rotary screen cylinder 20 (strictly, a cylindrical screen). The position is set so as to contact the inner peripheral surface of the plate 20a).

  The surface of the squeegee 23 on the upstream side in the rotational direction of the rotary screen cylinder 20, that is, the surface on the downstream side in the movement direction of the squeegee 23 in the relative movement between the squeegee 23 and the rotary screen cylinder 20 (in FIG. ) Near the base end, a regulating plate that covers the space S on the upstream side in the rotational direction of the contact portion of the squeegee 23 with the rotary screen cylinder 20, that is, on the downstream side in the moving direction of the squeegee 23 in the relative movement The base end side is attached without gap so that only a part of the opening formed by the squeegee 23 and the rotary screen cylinder 20 in the space S is open, and the base end side is attached without a gap. Of the rotary screen cylinder 20 to such an extent that there is a gap without contacting the inner peripheral surface of the rotary screen cylinder 20. It is extended toward the surface.

  A pair of dam portions 27 covering the space S are provided at both ends in the longitudinal direction of the regulating plate 26, that is, at both ends in the horizontal direction orthogonal to the moving direction (left and right in FIGS. 2 and 3). The rotary screen cylinder to such an extent that there is a gap without contacting the inner peripheral surface of the rotary screen cylinder 20 so as to close the rest while opening a part of each of both ends in the horizontal direction orthogonal to the moving direction of S. The dam portions 27 are integrally formed with the restriction plate 26 by bending both ends of the restriction plate 26 in the longitudinal direction.

  One end of the ink supply pipe 28 is connected to one end side (the left end side in FIGS. 2 and 3) of the restriction plate 26, and the other end of the ink supply pipe 28 is installed outside the rotary screen cylinder 20. One end side on the squeegee 23 (the left end side in FIGS. 2 and 3) is connected to the ink tank 29 and the ink stored in the ink tank 29 is interposed in the ink supply pipe 28. To be supplied. The ink supply pipe 28, the supply pump 30, the ink tank 29 and the like constitute a liquid supply device.

  On the other hand, the ink flowing out from the other end side of the squeegee 23 along the cylinder axis direction of the impression cylinder 11 can be stored below the other end side of the squeegee 23 (right end side in FIGS. 2 and 3). An ink tray 31 is provided. One end of an ink collection tube 32 is connected to the ink tray 31 and the other end of the ink collection tube 32 is connected to the ink tank 29, and the ink stored in the ink tray 31 is transferred to the ink collection tube 32. The ink is collected in the ink tank 29 by a collecting pump 33 interposed therebetween. The ink recovered from the ink recovery pipe 32 into the ink tank 29 is stirred and mixed in the ink tank 29 and re-supplied from the ink supply pipe 28 onto the squeegee 23. The ink receiving tray 31, the ink recovery pipe 32, the recovery pump 33, the ink tank 29 and the like constitute a liquid recovery apparatus.

  The squeegee 23 is inclined such that one end side to which ink is supplied by the ink supply tube 28 is higher than the other end side to which ink is recovered by the ink recovery tube 32, and the inclination angle will be described later. The squeegee angle adjusting device can be adjusted according to the clay of the ink. Further, along with this, the rotary screen cylinder 20 and the impression cylinder 10 themselves can be inclined as necessary.

  4 to 6 show a structure for supporting the rotary screen cylinder 20. According to this, the rotary screen cylinder 20 is supported between the left and right frames 40 via the eccentric bearing 41 so as to be tiltable in the vertical direction. The left and right eccentric bearings 41 are supported by both the left and right frames 40 so as to be rotatable and slidable in the left-right direction (axial direction).

  The rotary screen cylinder 20 has a cylindrical screen plate 20a supported between the left and right holders 20c via flanges 20b. The rotary screen cylinder 20 has a small diameter portion of the left and right holders 20c with respect to the eccentric bearing 41. The bearing 42 is rotatably supported. A large number of small holes 20d (see FIGS. 2 and 3) corresponding to the pattern are formed in the screen plate 20a.

  A gear 43 is fixed to the small diameter portion of the right holder 20c at the end, and a gear 45 fixed on the output shaft of the motor 44 is engaged with the gear 43. The motor 44 is attached to a subframe 46 coupled to the right frame 40.

  Therefore, the rotary screen cylinder 20 is rotationally driven by the motor 44 via the gear mechanism described above and can be registered upside down.

  One end of a link 47 is pin-coupled to each of the left and right eccentric bearings 41, and one end of a lever 48 is pin-coupled to the other end of these links 47. The intermediate portions in the longitudinal direction of the left and right levers 48 are respectively fixed to rotating shafts 49 that are rotatably supported by the left and right frames 40. The tip ends of the screw members 50a of the left and right ball screws 50 are pin-coupled to the other ends of the left and right levers 48, respectively.

  The base end portions of the left and right screw members 50a are screwed into nut members 50b fixed in the left and right support cases 51, respectively. The gears 52 b fixed to the output shafts of the left and right motors 53 mesh with the gears 52 a fixed to the base ends of both the left and right screw members 50 a. The left and right motors 53 are attached to the frame 40 as appropriate.

  Accordingly, when the eccentric bearing 41 is rotated by the at least one of the left and right motors 53 via the ball screw 50 described above, one end side of the rotary screen cylinder 20 is eccentrically rotated, and the rotary screen cylinder 20 is rotated. The rotary screen cylinder 20 is inclined in the vertical direction due to the difference in eccentricity from the other end side.

  As shown in FIGS. 5 and 6, the support shaft 21 described above is inserted into the rotary screen cylinder 20, and the right end side thereof is a fitting hole of the receiving member 54 located outside the subframe 46. 54a is fitted and supported so that it can rotate and move (slide) in the left-right direction (axial direction), while the left end side is rotated and moved in the left-right direction (by the receiving member 55 positioned on the outer side of the left frame 40). The movement (slide) in the axial direction is impossible to be fitted and supported.

  That is, the left end side of the support shaft 21 is prevented from moving (sliding) in the left-right direction (axial direction) by the left and right stepped portions 21a and 21b, while the groove bottom portion of the receiving member 55 is tapered. The rotation is prevented by being pressed from above by the presser plate 56a while being accommodated in the formed fitting groove 55a.

  The retainer plate 56a is horizontally rotatable about the fulcrum pin 57 so that the fitting groove 55a can be opened and closed. With the fitting groove 55a closed, the fixing lever 56b and the retaining plate 56a and the receiving member are closed. The closed state is maintained by being screwed into 55.

  The left and right receiving members 54 and 55 are supported by a support case 60 attached to the frame 40 and the subframe 46 through a ball screw 61 so as to be movable up and down. Specifically, a nut member 61a of the ball screw 61 is fixed in the support case 60, and a screw member 61b screwed into the nut member 61a penetrates the support case 60 up and down. The non-screw-forming shaft portion of the screw member 61b is rotatably supported in the support case 60 via the bearing 62.

  The upper end portion of the screw member 61b is connected to the receiving member 54 via the spherical bearing 63 so as to allow the rotation of the screw member 61b and the inclination of the support shaft 21 when the position of the support shaft 21 is adjusted later. 55 is engaged with the engagement holes 54b and 55b. On the other hand, a gear 64a is fixed to the lower end portion of the screw member 61b, and the gear 64b fixed on the output shafts of the motors 65A and 65B meshes with the gear 64a. The left motor 65A is attached to the outer surface of the frame 10, and the right motor 65B is attached to the outer surface of the subframe 46.

  In FIG. 1, reference numeral 66 denotes a detent pin for positioning the receiving members 54 and 55 when the support shaft 21 is not present and for positioning the support shaft 21 in the front-rear direction.

  Accordingly, the left and right motors 65A and 65B are independently driven (or one of the left and right motors 65A and 65B is driven), and the receiving members 54 and 55 are supported through the ball screws 61, respectively. By moving up and down with respect to 60, the vertical heights (positions) of the left and right ends of the support shaft 21 can be arbitrarily adjusted individually.

  In other words, by adjusting the left end side of the support shaft 21 to be higher than the right end side, the squeegee 23 supported by the support shaft 21 is supplied with ink by the ink supply tube 28 as shown in FIG. The one end side is inclined so as to be higher than the other end side where the ink is recovered by the ink recovery tube 32. That is, the left and right motors 65A and 65B, the left and right ball screws 61, the left and right receiving members 54 and 55, the support shaft 21 and the like constitute a squeegee angle adjusting device.

  When the impression cylinder 11 is inclined, as shown in FIG. 7, the left and right shaft ends of the impression cylinder 11 are rotatably supported by the left and right frames 40 via bearings 70a and 70b, respectively. At this time, only the left end side bearing 70 a may be supported by the left frame 40 via the eccentric bearing 71.

  Thereby, by rotating the eccentric bearing 71 by an appropriate means, the impression cylinder 11 can be inclined so that the left end side of the impression cylinder 11 is higher than the right end side.

  As described above, as described above, the paper fed from the paper feeding unit (or the pre-process processing unit) (not shown) and transferred from the transfer cylinder 12 to the impression cylinder 11 is paired with the rotary screen cylinder 20. As the paper passes through the contact position, ink is screen printed on the surface of the paper.

  That is, the ink supplied onto the squeegee 23 in the rotary screen cylinder 20 is pushed out from the many holes 20d formed in the screen plate 20a onto the surface of the paper held on the impression cylinder 11.

  Under such screen printing, if the rotary screen cylinder 20 is damaged due to deterioration of the screen plate 20a over time, the ink accumulated inside the rotary screen cylinder 20 leaks to the outside.

  However, in this embodiment, since the rotary screen cylinder 20 is disposed on the side of the impression cylinder 11, damage to peripheral equipment such as the impression cylinder of screen printing liquid when the rotary screen cylinder 20 is damaged is minimized. The reliability of the device can be increased.

  In addition, when performing the high-speed screen printing by rotating the impression cylinder 11 and the rotary screen cylinder 20 at a high speed during the above-described screen printing, the regulating plate 26 is placed on the rotary screen cylinder on the squeegee 23 in the rotary screen cylinder 20. The ink moves to the upstream side in the rotation direction of the rotary screen cylinder 20, that is, to the downstream side in the movement direction of the squeegee 23 in the relative movement of the rotary screen cylinder 20 and the squeegee 23 so as to retain the ink in the space S 20. Since it can regulate, it can control that the ink concerned is greatly stirred while flowing so that it circulates by rotation of the rotary screen cylinder 20, so that it is greatly suppressed that the ink embeds air inside and bubbles. it can.

  In addition, the dam 27 on the squeegee 23 restricts the movement of ink that tends to flow out from both longitudinal ends of the squeegee 23 toward the cylinder axis of the rotary screen cylinder 20. Returned.

  As a result, the ink on the squeegee 23 is effectively pushed without waste from the holes 20d of the screen plate 20a onto the surface of the paper on the impression cylinder 11, so that high-quality screen printing is performed and the squeegee is used. 23, it is possible to suppress the outflow of ink from above, so that it is possible to prevent members such as end rings located at both ends of the rotary screen cylinder 20 from being stained with ink, and maintenance such as cleaning can be facilitated. .

  Further, in this embodiment, the squeegee 23 is inclined so that one end side where the ink is supplied by the ink supply pipe 28 is higher than the other end side where the ink is recovered by the ink recovery pipe 32, and the inclination angle is The squeegee angle adjusting device described above can be adjusted according to the clay of the ink. In addition, along with the adjustment of the inclination angle of the squeegee 23, the rotary screen cylinder 20 and the impression cylinder 10 themselves can be inclined as necessary.

  As a result, since the ink can always flow on the squeegee 23, it is possible to stabilize the characteristics by avoiding the deterioration of highly volatile ink, and high-quality screen printing can be performed.

  In particular, when the printing place by the rotary screen device 10 is limited to a specific small range, even with the ink supplied on the squeegee 23, the portion of the hole 20d of the screen plate 20a is printed on paper and consumed. The portion without 20d is accumulated without being consumed, and the highly volatile ink is exposed to the outside air for a long time. This is because when the rotary screen cylinder 20 is arranged on the side of the impression cylinder 11 as in the present embodiment, the gravity acting on the ink is less than when the rotary screen cylinder 20 is arranged above the impression cylinder 11. It becomes noticeable when the influence is reduced.

  However, as in the present embodiment, at least the squeegee 23 is tilted so that the ink always flows and circulates, so that accumulation of ink on the squeegee 23 can be effectively avoided.

  The present invention is not limited to the above-described embodiments, and a varnish is used as a screen printing liquid or a mechanism for tilting a squeegee, a rotary screen cylinder, an impression cylinder, or the like is within the scope of the present invention. It goes without saying that various changes are possible.

  The rotary screen device according to the present invention can minimize damage caused when the rotary screen cylinder is broken, and can perform high-quality screen printing. Can do.

DESCRIPTION OF SYMBOLS 10 Rotary screen apparatus 11 Pressure cylinder 12 Transfer cylinder 20 Rotary screen cylinder 20a Screen plate 20b Flange 20c Holder 20d Hole 21 Support shaft 21a, 21b Stepped part 22 Bracket 23 Squeegee 24 Fixing plate 25 Bolt 26 Restriction plate 27 Weir part 28 Ink supply Pipe 29 Ink tank 30 Supply pump 31 Ink tray 32 Ink collection pipe 33 Collection pump 40 Frame 41 Eccentric bearing 42 Bearing 43 Gear 44 Motor 45 Gear 46 Subframe 47 Link 48 Lever 49 Rotating shaft 50 Ball screw 50a Screw member 50b Nut member 51 Support case 52a Gear 52b Gear 53 Motor 54 Receiving member 54a Fitting hole 54b Engaging hole 55 Receiving member 55a Fitting groove 55b Engaging hole 56a Presser plate 56b Fixing lever 57 fulcrum pin 60 support case 61 ball screw 61a nut member 61b screw member 62 bearing 63 spherical bearing 64a, 64b gear 65A, 65B motor 66 non-rotating pin 70a, 70b bearing 71 eccentric bearing S space

Claims (2)

A rotary screen cylinder that has a cylindrical screen plate with a plurality of holes formed on its peripheral surface and is rotatably supported and is in contact with the impression cylinder;
A squeegee that abuts the inner peripheral surface of the screen plate and pushes the liquid fed to the inner peripheral surface of the screen plate to the surface of the sheet held by the impression cylinder from the hole;
A tank for storing the liquid;
A liquid supply device for supplying the liquid stored in the tank onto the squeegee;
A liquid recovery apparatus that receives liquid flowing out from the squeegee and returns it to the tank;
In the rotary screen device with
The rotary screen cylinder is disposed on the side of the impression cylinder,
The squeegee is tilted so that one end in the longitudinal direction is positioned higher than the other end, and the liquid supply device supplies liquid from one end side of the squeegee, while the liquid recovery device is the other end of the squeegee. Recover liquid from the side,
A rotary screen device characterized by that.   The rotary screen device according to claim 1, further comprising a squeegee angle adjusting device that adjusts an inclination angle of the squeegee.

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