JP2006335023A - Ink-supply apparatus of printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink-supply apparatus of a printing machine wherein fluctuation in rotation of an ink distributing roller caused by variation in torque applied on the ink distributing roller when the ink distributing roller accelerates a vibrating roller without using a complicated device. <P>SOLUTION: A contact point E of a cam follower 52 and a cam 51, at which the circumference of the vibrating roller and the circumference of the ink distributing roller are caused to start getting into contact with each other, and a contact point C of the cam follower 52 and the cam 51, at which the circumference of the vibrating roller and the circumference of the ink distributing roller are allowed to get into contact with each other in a predetermined nip width, are set on the outer circumference of the cam 51. The distance between the contact point E and the contact point C is set to the optimum length L in which the ink distributing roller can be gradually accelerated to cause the vibrating roller to follow the rotation of the ink distributing roller and rotate until the contact width of the circumference of the ink distributing roller and the circumference of the vibrating roller reaches the specified nip width after the start of contact. A curved line capable of causing displacements La, Lb, Lc and Ld per unit angle α1 defined by equally dividing the angle corresponding to the length L is employed between the points E and C, wherein the displacements La, Lb, Lc and Ld gradually increase in the rotation direction of the cam 51. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ink supply device for a printing press, and more particularly to an ink supply device for a printing press that prevents occurrence of printing unevenness without using a complicated device.

  The ink supply device in the printing machine described in the following Patent Document 1 (Japanese Patent Laid-Open No. 11-105260) includes a blade, a fountain roller, and an ink stored in an ink fountain by rotation of a driven fountain roller. The ink supplied to the fountain roller from the gap is controlled by a cam that rotates in synchronization with the fountain roller, and passes through an ink transfer roller that periodically moves between the fountain roller and the ink kneading roller. The ink is transferred from the fountain roller to the ink kneading roller, and further supplied to the printing plate on the plate cylinder through the roller group. A spring is provided so that the cam follower is pressed against the cam.

  The ink transfer roller is a fountain roller having a low peripheral speed because it is an ink supply source, and a peripheral speed that is the same as the peripheral speed of the printing plate surface on the plate cylinder in order to continuously supply ink to the printing plate through a group of rollers. Move between two rollers with a large difference in peripheral speed with a high-speed ink kneading roller, and contact each other alternately. In addition, a desired nip width set in advance between each roller is obtained, and the contacted roller is rotated. To do. Therefore, during printing operation, the ink transfer roller that contacts the fountain roller with a desired nip width and rotates at a slow peripheral speed that is the same as the peripheral speed of the fountain roller is separated from the fountain roller and the printing plate surface on the plate cylinder When the ink comes into contact with the ink kneading roller rotating at a high peripheral speed, which is the same as that of the ink kneading roller, the desired nip width is obtained at once and the ink kneading roller is immediately rotated at the same peripheral speed as the ink kneading roller. The kneading roller is in a state where the ink transfer roller is accelerated at a stroke, and a sudden torque fluctuation occurs in the ink kneading roller.As a result, rotation unevenness occurs in the roller, so that the ink amount is not parallel to the axis of the ink kneading roller. A uniform state arises, and this is further supplied to the printing plate as a light and dark stripe of ink through a group of rollers downstream of the ink kneading roller, and on the printing surface. It appears as a pale uneven, had an adverse effect on the printing quality.

  As a means for solving this problem, Patent Document 2 (Japanese Patent Laid-Open No. 11-77975) discloses that the ink transfer roller is driven and the peripheral speed of the ink transfer roller is set to contact with the fountain roller and the ink kneading roller. Means are shown to equal the peripheral speed of each roller.

Further, in Patent Document 3 (Japanese Patent Laid-Open No. 2000-117946), an angular acceleration that is periodically adjusted to the circumferential surface of the cam is given, and the bounce of the cam follower that is pressed in the direction of the cam by the spring is prevented. In addition to ensuring that the follower is always in contact with the cam, the cam shape area that moves the ink transfer roller in the direction of contact with the ink kneading roller slows down the angular acceleration of the cam when contacting the cam follower. Means for doing this is shown.
JP-A-11-105260 Japanese Patent Laid-Open No. 11-77975 JP 2000-117946 A

  However, the means shown in the above-mentioned JP-A-11-77975 and JP-A-2000-117946 for eliminating printing unevenness changes the means for changing the rotational speed of the ink transfer roller or the angular acceleration of the cam. Therefore, a complicated device including the control means is required, the probability of failure is high, maintenance is complicated, and a large installation space is required.

  As a result of various tests conducted by the applicant of the present invention to solve this problem, it is possible to prevent uneven rotation of the ink kneading roller without using a complicated device, and as a result, it does not cause uneven printing. I found a means.

  That is, the present invention provides an ink supply for a printing press that can prevent uneven rotation of the ink kneading roller due to torque fluctuations generated in the ink kneading roller when the ink kneading roller accelerates the ink transfer roller without using a complicated device. The purpose is to provide a device.

  Therefore, the present invention provides the following configuration in order to solve the problems of the conventional technology at once. That is, the present invention provides a fountain roller that is provided in a printing press and serves as an ink supply source, an ink kneading roller that supplies ink supplied from the fountain roller to a printing plate via an arbitrary roller group, An ink transfer roller that moves between a fountain roller and the ink kneading roller and supplies ink from a peripheral surface of the fountain roller to a peripheral surface of the ink kneading roller, and the fountain roller and the ink of the ink transfer roller An ink supply device comprising a cam for controlling movement between the kneading roller and the cam, after the contact between the peripheral surface of the ink transfer roller and the peripheral surface of the ink kneading roller, the contact From the state to the predetermined nip width, the ink kneading roller is An ink supply apparatus for a printing press, characterized in that it has a shape to control so as to moderate the torque fluctuation that.

  In the ink supply device of the printing press, the present invention further includes a cam follower that contacts the circumferential surface of the rotating cam and moves the ink transfer roller toward the ink kneading roller via a predetermined arm. And the cam includes a first contact point between the cam follower and the peripheral surface of the cam when the peripheral surface of the ink transfer roller and the peripheral surface of the ink kneading roller start contact, and the ink transfer A second contact point between the cam follower and the peripheral surface of the cam when the peripheral surface of the roller and the peripheral surface of the ink kneading roller reach the predetermined nip width from the contact state; The amount of change in the distance between the contact point between the cam follower and the peripheral surface of the cam and the center point of rotation of the cam per unit angle obtained by equally dividing the angle α, which is an angle formed with the rotation center point, A peripheral surface formed so that the cam follower gradually increases from the time when the cam follower contacts the peripheral surface of the cam at the first contact point to the time when the cam follower contacts the peripheral surface of the cam at the second contact point. It is characterized by providing.

  Moreover, the present invention is characterized in that in the ink supply device of the printing press, the angle α is 20 ° or more and less than 60 °.

  In the present invention, the cam shape as described later moderates the increase in the nip width between both rollers from when the ink transfer roller and the ink kneading roller contact each other until the maximum nip width necessary for the printing operation is obtained. The torque fluctuation generated in the ink kneading roller can be moderated when the ink kneading roller accelerates by transmitting the peripheral speed to the ink transfer roller.

  As a result, it is possible to prevent uneven rotation of the ink kneading roller when the torque fluctuates, and to prevent the problem of uneven printing related to the print quality caused by the uneven rotation, and to change the rotation speed of the ink transfer roller. This eliminates the need for complicated apparatus maintenance management and a large installation space, including means for controlling or means for controlling the angular acceleration of the cam.

  Next, an embodiment of the ink supply device 1 in the printing press according to the present invention will be described with reference to FIG. 1 which is a schematic view of the ink supply device of the printing press and FIG. 2 which is a schematic plan view of FIG.

  In FIG. 1, 1 is an ink supply device, 2 is a fountain roller mechanism, 3 is an ink transfer roller mechanism, 4 is an ink kneading roller mechanism, 5 is a cam mechanism, 6 is an ink fountain, 7 is a roller pressing mechanism, and 8 is a roller nip. It is an adjustment mechanism. 20 is a fountain roller, 21 and 21 'are bearings, 30 is an ink transfer roller, 31 and 31' are arms, 32 and 32 'are bearings, 33 is a shaft, 40 is an ink kneading roller, and 41 and 41' are arms. , 42 and 42 'are bearings, 43 and 43' are support shafts, 51 is a cam, 52 is a cam follower, 53 is an arm, 54 is a cam shaft, 61 is an ink blade, 71 is a compression spring, 71 is an arm, and 73 is an arm Adjustment screw, 74 is an adjustment nut, 75 is a fixing bracket, 76 is a stopper nut, 81 and 81 'are links, 82 and 82' are adjustment bolts, 83 and 83 'are fixing brackets, 84 and 84' are fixing nuts, 85 , 85 ′ are set colors. Incidentally, for example, 21 'with a dash represents a bearing existing in the back as viewed from the paper surface of FIG. 1 (the same applies hereinafter).

  In FIG. 2, reference numerals 22 and 22 'denote frames, and 34 and 34' denote bearings. 2 that are denoted by the same reference numerals as those shown in FIG. 1 are the same as those shown in FIG.

  The ink supply device 1 in the printing machine supplies the ink IK stored in the ink fountain 6 by the rotation of the fountain roller 20 to the fountain roller 20 from the gap S between the ink blade 61 and the fountain roller 20, and the supplied ink IK. 'Is controlled from the fountain roller 20 between the fountain roller 20 and the ink kneading roller 40 by the cam mechanism 5 and supplied to the ink kneading roller 40 through the ink transfer roller 30 that moves periodically.

  The ink IK ′ supplied to the ink kneading roller 40 is not shown, but is supplied to the printing plate on the plate cylinder via a roller contacting the ink kneading roller 40 and further through several roller groups. The That is, the peripheral speed of the ink kneading roller 40 is regulated by the peripheral speed of the plate cylinder.

  As shown in FIG. 1, the ink supply device 1 in the printing press described here includes a fountain roller mechanism 2, an ink transfer roller mechanism 3, an ink kneading roller mechanism 4, a cam mechanism 5, an ink fountain 6, A roller pressing mechanism 7 and a roller nip adjusting mechanism 8 are included.

  Each component will be described. However, since the two sets of roller nip adjusting mechanisms 8 provided at both ends of each of the roller mechanisms 2, 3, 4 and at both ends of the ink kneading roller mechanism 4 are the same in structure, one of them is indicated with a '. .

(1) Fountain roller mechanism 2
The fountain roller 20 is rotatably supported on the frame 22 (22 ′) by a bearing 21 (21 ′), and supplies ink IK from an ink fountain 6 described later by a driving means (not shown) (clockwise in FIG. 1). ). The number of revolutions can be changed.

(2) Ink transfer roller mechanism 3
Both ends of the shaft 33 are rotatably supported by the frame 22 (22 ′) by bearings 34 (34 ′). An ink transfer roller 30 is rotatably supported at one end of the arm 31 (31 ′) via a bearing 32 (32 ′), and the other end is fixed to the shaft 33. The ink transfer roller 30 moves using the shaft 33 as a fulcrum via an arm 31 (31 ′).

(3) Ink kneading roller mechanism 4
The arm 41 (41 ′) has an ink kneading roller 40 rotatably supported at its intermediate portion via a bearing 42 (42 ′), and has a roller nip adjusting mechanism 8 to be described later at one end, and the other end at the other end. It is attached to the frame 22 (22 ′) via a support shaft 43 (43 ′) so as to be angularly displaceable. The ink kneading roller 40 moves using the support shaft 43 (43 ′) as a fulcrum via the arm 41 (41 ′).

(4) Cam mechanism 5
The cam 51 is fixed to a cam shaft 54 that is rotated from a drive source (not shown). The arm 53 is provided with a cam follower 52 at one end, and the other end is fixed to the shaft 33. The cam follower 52 is provided so as to be able to contact the outer peripheral surface of the cam 51. Therefore, as the cam 51 rotates, the position of the cam follower 52 is displaced according to the outer peripheral surface of the cam 51, and the shaft 33 rotates clockwise or counterclockwise via the swing of the arm 53, so that the shaft 33 The ink transfer roller 30 moves between the fountain roller 20 and the ink kneading roller 40 through the arm 31 (31 ′) fixed to the head.

  For the cam shape of the present invention, FIG. 1, which is a schematic diagram of the cam shape showing the change of the curve indicating the outer peripheral surface larger than the actual one so that the operation thereof can be easily understood, and the ink transfer roller 30 as the fountain roller 20. A description will be given with reference to FIG. 4 which is an allocation angle-displacement diagram of the cam curve of the portion moved from the “attached” state to the “attached” state by the ink kneading roller 40.

  FIG. 3 shows the positional relationship between the outer periphery of the cam 51 and the cam follower 52. Point A, point B, point C and point D are changing positions of a curve indicating the outer peripheral surface located in the order in which the cam 51 rotates and contacts the cam follower 52. In the embodiment of the present invention shown in FIGS. The rotation direction of the cam 51 is counterclockwise. In the illustrated embodiment, the cam 51 of the present invention has a small radius from point A to point B in which the peripheral surface of the ink transfer roller 30 is an outer peripheral surface that can contact the peripheral surface of the fountain roller 20 with a predetermined nip width. r portion, and the peripheral surface of the ink transfer roller 30 has a large radius R portion from point C to point D which is an outer peripheral surface that can come into contact with the peripheral surface of the ink kneading roller 40 with a predetermined nip width. A design point E at which the ink transfer roller 30 and the ink kneading roller 40 start to contact between a point B that is a trailing end of the rotation direction of the radius r portion and a point C that is the leading end of the large radius R portion. The point B and the point C are connected by the two curves from the point B to the point E and the point E to the point C, and the point E and the point C are connected at the point E between the peripheral surface of the ink transfer roller 30 and the ink kneading roller 40. Until the predetermined nip width is reached after contact with the peripheral surface of the Nki kneading roller 40 to the length L of the best is gradually possible accelerated in order to rotate together with the roller 30 was transferred ink.

  As a result of the test, the illustrated angle α corresponding to the optimum length L is 20 ° to 60 °. When the angle α is 60 ° or more, the amount of ink transferred from the fountain roller 20 to the ink kneading roller 40 via the ink transfer roller 30 is insufficient. In other words, the optimal allocation of the contact time between the fountain roller 20 and the ink transfer roller 30 and the contact time between the ink transfer roller 30 and the ink kneading roller 40 cannot be achieved, and an optimal ink transfer amount between the rollers is ensured. This is because it cannot be done.

  Also, if the angle α is smaller than 20 °, the torque fluctuation generated in the ink kneading roller from the contact between the ink transfer roller and the ink kneading roller to the predetermined nip width becomes abrupt, resulting in rotation unevenness. End up.

  Furthermore, it is desirable that the angle α be curved so that the variation amounts La, Lb, Lc, and Ld in the rotational direction of the cam 51 per unit angle α1 are gradually increased. Here, La, Lb, Lc, and Ld indicate the amount of change per unit angle α1 of the distance between the contact point between the cam follower 52 and the cam 51 and the center of rotation of the cam 51, respectively.

  For example, referring to FIG. 4, which is an example of an allocation angle-displacement diagram of a cam curve at a portion where the ink transfer roller 30 is moved from the “attached” state to the fountain roller 20 to the “attached” state to the ink kneading roller 40, It can be seen that the cam displacement (mm) per unit angle gradually increases between the point C and the point C.

  In the embodiment shown in FIG. 3, the angle α is divided into four parts, but the present invention is not limited to this. Further, the point D, which is the trailing end of the rotation direction of the large radius R portion, is connected by a single curve from the point A, which is the leading end of the rotation direction of the small radius r portion. In the illustrated embodiment, the cam 51 has a maximum nip width required for printing operation when setting the nip width between the fountain roller 20 and the ink transfer roller 30 by the roller pressing mechanism 7 described later. The outer periphery of the small radius r and the cam follower 52 are formed so as not to contact each other, and the point G to the point F on the outer periphery of the cam is a non-contact portion.

(5) Inkwell 6
The ink fountain 6 stores the ink IK between the fountain roller 20 and the thickness determined by the gap S between the fountain roller 20 and the tip of the ink blade 61 when the fountain roller 20 rotates clockwise in FIG. Ink IK ′ is supplied to the peripheral surface of the fountain roller 20.

  A plurality of ink blades 61 are provided in the axial direction of the fountain roller 20, and the gap S with the fountain roller 20 can be adjusted individually.

(6) Roller pressing mechanism 7
One end of the arm 72 is fixed to the shaft 33, and the other end is connected to one end of the adjustment screw 73. The other end of the adjustment screw 73 is incorporated in the through hole of the fixing bracket 75 so as to be axially movable. The adjustment screw 73 is provided with an adjustment nut 74 and a compression spring 71 between the arm 72 and the fixing bracket 75. In addition, a stopper nut 76 is provided on the protruding side of the fixing bracket 75 from the through hole.

  The repulsive force of the compression spring 71 acts to angularly displace the shaft 33 through the adjusting nut 74, the adjusting screw 73, and the arm 72, and further, the ink transfer roller 30 from the shaft 33 through the arm 31 (31 '). Acting on the fountain roller 20 and acting in the direction in which the cam follower 52 is brought into contact with the outer peripheral surface of the cam 51 from the shaft 33 via the arm 53.

(7) Roller nip adjustment mechanism 8
The link 81 (81 ′) is connected to one end of the arm 41 (41 ′), and an adjustment bolt 82 (82 ′) is screwed into the link 81 (81 ′), and the adjustment bolt 82 (82 ′) is attached thereto. The fixing nut 84 (84 ′) provided is fixed to the link 81 (81 ′). The other end of the adjustment bolt 82 (82 ') is incorporated into the through hole of the fixing bracket 83 (83'), so that the adjustment bolt 82 (82 ') can rotate and cannot move in the axial direction. 82 ′) and the set collar 85 (85 ′) so as to sandwich the fixing bracket 83 (83 ′).

  The operation of the ink supply device for a printing press according to the present invention will be described below with reference to FIGS. Prior to the start of operation, the maximum nip width required for the printing operation between the rollers is set. That is, after turning the cam 51 and setting the small radius r of the cam 51 to the position of the cam follower 52, the adjustment nut 74 of the roller pressing mechanism 7 is moved to change the strength of the repulsive force of the compression spring 71, and the fountain roller The maximum nip width (hereinafter referred to as a set nip width 1) required for the printing operation of the ink transfer roller 30 and the ink transfer roller 30 is set to a desired dimension. If the repulsive force of the compression spring 71 is increased, the nip width 1 increases.

  Next, the cam 51 is rotated in the direction in which the large radius R portion of the cam 51 comes to the position of the cam follower 52, and resists the repulsive force of the compression spring 71 via the arm 53, the shaft 33, and the arm 31 (31 ′). The ink transfer roller 30 is moved from the fountain roller 20 side to the ink kneading roller 40 side. After setting the large radius R portion of the cam 51 to the position of the cam follower 52, the fixing nut 84 (84 ′) of the roller nip adjusting mechanism 8 is loosened, and the adjusting bolt 82 (82 ′) that does not move in the axial direction is turned to turn the link 81 Ink supported by the intermediate portion of the arm 41 (41 ′) and the arm 41 (41 ′) of the ink kneading roller mechanism 4 to which the link 81 (81 ′) is connected is changed. The kneading roller 40 is moved with the support shaft 43 (43 ′) of the arm 41 (41 ′) as a fulcrum, and the maximum nip width necessary for the printing operation of the ink transfer roller 30 and the ink kneading roller 40 (hereinafter, the set nip is set). (Referred to as width 2) is set to the desired dimension. Accordingly, during operation, the set nip width 1 between the ink transfer roller 30 and the fountain roller 20 at the small radius r portion of the cam 51 is set, and the set nip width 2 between the ink transfer roller 30 and the ink kneading roller 40 at the large radius R portion. Are obtained respectively. Note that the order of setting the two maximum nip widths necessary for the printing operation may be either.

  The operations of the fountain roller 20, the ink transfer roller 30, and the ink kneading roller 40 relating to the position of the cam follower 52 and the shape area on the outer periphery of the rotating cam 51 during operation will be described. The repulsive force of the compression spring 71 of the roller pressing mechanism 7 acts to angularly displace the shaft 33 via the adjusting nut 74, the adjusting screw 73 and the arm 72, and the angular displacement of the shaft 33 due to the repulsive force of the compression spring 71. Acts in the direction of pressing the cam follower 52 toward the outer peripheral surface of the cam 51 via the arm 53 (53 ′). When the cam 51 rotates from this state, the ink transfer roller 30 and the force that angularly displaces the shaft 33 due to the repulsive force of the compression spring 71 while the small radius r portion of the cam 51 is rotationally displaced in the position of the cam follower 52. The set nip width 1 is obtained in which the nip reaction force between the fountain roller 20 and the fountain roller 20 is balanced. Normally, the cam follower 52 does not contact the outer peripheral surface of the small radius r portion of the cam 51. Further, when the cam 51 rotates and the portion of the cam follower 52 that moves from the small radius r portion to the large radius R portion is rotationally displaced, the cam follower 52 is camped halfway (point F of the cam 51). The outer peripheral surface of 51 is contacted. After the contact, the ink transfer roller 30 moves away from the fountain roller 20 via the arm 53, the shaft 33, and the arm 31 (31 ′) against the repulsive force of the compression spring 71 that angularly displaces the shaft 33, and the ink kneading roller Move in the 40 direction. Further, the ink transfer roller 30 and the ink kneading roller 40 come into contact with each other at the point E of the cam 51, and the set nip width 2 set as described above is obtained between the ink transfer roller 30 and the ink kneading roller 40 until the point C of the cam 51. Thus, the set nip width 2 is maintained while the large radius R portion is rotationally displaced in the position of the cam follower 52.

  The process from when the ink transfer roller 30 and the ink kneading roller 40 come into contact until the set nip width 2 is obtained will be described in detail. The length from the point E of the cam 51 where the ink transfer roller 30 and the ink kneading roller 40 start to contact each other after the cam 51 rotates and displaces until the point C of the cam 51 passes. During L, the ink transfer roller 30 gradually increases the nip width with the ink kneading roller 40, the ink kneading roller 40 gradually accelerates the ink transfer roller 30, and the angle α is divided equally. By gradually increasing the change amounts La, Lb, Lc, and Ld for each α1, the nip width of the moving ink transfer roller 30 to the ink kneading roller 40 is small at the initial stage of roller contact, and gradually increases. Thus, the ink transfer roller 30 can be accelerated by the ink kneading roller 40 with less torque fluctuation.

  Further, when the cam 51 rotates and the position of the cam follower 52 shifts from the large radius R portion to the small radius r portion of the cam 51, the outer periphery of the cam 51 is halfway (point G of the cam 51). The cam follower 52 is separated from the surface, and the ink transfer roller 30 is kneaded by the repulsive force of the compression spring 71 via the adjusting nut 74, the adjusting screw 73, the arm 72, the shaft 33, and the arm 31 (31 '). After moving away from the roller 40 and moving toward the fountain roller 20, the set nip width 1 is obtained after contacting the fountain roller 20. Thereafter, the same operation is repeated as the cam 51 rotates.

  A mode of ink supply operation during operation will be described. The ink IK stored between the fountain roller 20 and the ink fountain 6 is supplied onto the fountain roller 20 from the gap S between the fountain roller 20 and the tip of the ink blade 61 as the fountain roller 20 rotates. The ink supply amount is adjusted by the gap amount of the gap S and the rotation speed of the fountain roller. The ink blade 61 that is divided into a plurality of parts in the axial direction of the fountain roller 20 can individually adjust the gap amount of the gap S. The supplied ink IK ′ on the fountain roller 20 is transferred from the fountain roller 20 to the ink transfer roller 30 while the fountain roller 20 and the ink transfer roller 30 are nipped and rotated. The ink transfer roller 30 moves from the fountain roller 20 toward the ink kneading roller 40, contacts the ink kneading roller 40, and then transfers from the ink transfer roller 30 to the ink kneading roller 40 while the ink transfer roller 30 and the ink kneading roller 40 are nipped and rotated. To do.

It is the schematic of the ink supply apparatus of the printing machine of this invention. Moreover, it is an AA arrow view seen through the frame of FIG. FIG. 2 is a schematic plan view of FIG. 1. It is the schematic of the cam shape of this invention. FIG. 4 is an allocation angle-displacement diagram of a cam curve of a portion where the ink transfer roller of the present invention is moved from the “attached” state to the fountain roller to the “attached” state to the ink kneading roller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ink supply apparatus 2 Fountain roller mechanism 3 Ink transfer roller mechanism 4 Ink kneading roller mechanism 5 Cam mechanism 6 Ink fountain 7 Roller pressing mechanism 8 Roller nip adjustment mechanism 20 Fountain roller 21, 21 'Bearing 22, 22' Frame 30 Ink transfer roller 31, 31 'arm 32, 32' bearing 33 shaft 34, 34 'bearing 40 ink kneading roller 41, 41' arm 42, 42 'bearing 43, 43' support shaft 51 cam 52 cam follower 53 arm 54 cam shaft 61 ink blade 71 Compression spring 72 Arm 73 Adjustment screw 74 Adjustment nut 75 Fixation bracket 76 Stopper nut 81, 81 'Link 82, 82' Adjustment bolt 83, 83 'Fixation bracket 84, 84' Fixation nut 85, 85 'Set collar A, B End of small radius r on the outer periphery C, D End of large radius R on the outer periphery of the cam E Design start point of the ink transfer roller and ink kneading roller on the outer periphery of the cam F The outer peripheral surface of the cam contacts the cam follower 52 G Point where cam outer circumferential surface leaves cam follower 52 R Large radius on cam r Small radius on cam L Length between point E and point C on cam periphery α Point E and point on cam periphery Angle formed between C and cam rotation center point α1 Unit angles La, Lb, Lc, Ld obtained by equally dividing the distance between point E and point C on each outer circumference Amount of change per unit angle α1 of cam surface IK Ink IK 'Supply ink S gap

Claims (3)

Provided in the printing press,
A fountain roller that is the source of the ink;
An ink kneading roller for supplying the ink supplied from the fountain roller to the printing plate via an arbitrary roller group;
An ink transfer roller that moves between the fountain roller and the ink kneading roller, and supplies ink from the peripheral surface of the fountain roller to the peripheral surface of the ink kneading roller;
An ink supply device comprising a cam for controlling movement of the ink transfer roller between the fountain roller and the ink kneading roller,
The cam is a torque generated in the ink kneading roller between the contact state and a predetermined nip width after the contact between the circumferential surface of the ink transfer roller and the circumferential surface of the ink kneading roller. An ink supply device for a printing press, having a shape that is controlled so as to moderate fluctuations. In the ink supply device for a printing press according to claim 1,
A cam follower that contacts the peripheral surface of the rotating cam and moves the ink transfer roller toward the ink kneading roller via a predetermined arm;
The cam
A first contact point between the cam follower and the peripheral surface of the cam when the peripheral surface of the ink transfer roller and the peripheral surface of the ink kneading roller start contact, the peripheral surface of the ink transfer roller and the A second contact point between the cam follower and the peripheral surface of the cam when the peripheral surface of the ink kneading roller reaches the predetermined nip width from the contact state, and a center point of rotation of the cam The amount of change in the distance between the contact point between the cam follower and the peripheral surface of the cam and the center point of rotation of the cam per unit angle obtained by equally dividing the angle α, which is an angle formed by the cam follower. And a peripheral surface formed so as to gradually increase between the contact point contacting the peripheral surface of the cam at the contact point and the contact point contacting the peripheral surface of the cam at the second contact point. Machine ink supply equipment . In the ink supply device for a printing press according to claim 2,
The said angle (alpha) is 20 degrees or more and less than 60 degrees. The ink supply apparatus of the printing press characterized by the above-mentioned.

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