JPH0313067B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inking device for supplying printing ink to the surface of a plate mounted on a plate cylinder in a rotary printing press.

The printing units of sheet-fed and web-fed rotary printing presses are equipped with an inking device that supplies ink to the plate surface. It consists of a transfer mechanism and a large number of roller groups that smooth and transfer the ink transferred to the swing roller in each direction and supply it to the printing plate.

FIG. 1 is a schematic side view of a conventional ink transfer mechanism. This will be explained based on this figure. This ink transfer mechanism 1 is installed in the lower printing device of a double-sided rotary printing press. The plate cylinder is provided above this mechanism via a group of rollers. Reference numeral 2 denotes a drive shaft for driving the ink transfer mechanism 1, which is drivingly connected to the plate cylinder via a group of gears (not shown) and gears 3, 4 (not shown), and is supported by bearings 5, 6. Bevel gear 8 on worm shaft 7 extending horizontally
meshes with the bevel gear 9 on the drive shaft 2.
Further, a worm wheel 11 on a camshaft 10 mounted obliquely below the bearing 6 meshes with a worm 12 on the worm shaft 7. At the eccentric point of the crank 13 which is pivotally attached to the camshaft 10, a connecting rod 14 is pivotally connected by a pivot 15, and the rotation of the camshaft 10 causes the connecting rod 14 to reciprocate in the left-right direction in the figure due to the crank action. is configured to do so. The reference numeral 16 is a pot roller, and its circumferential surface, ink blade 17, and left and right ink wells 1 are connected to each other.
An ink fountain 19 is formed at 8, and ink 20 is stored in this ink fountain 18. At the free end of the lever 22 on the lever shaft 21 which extends coaxially with one end shaft of the pot roller 16 and is supported,
The other end of the connecting rod 14 is pivotally mounted, and a clutch arm 23 is pivotally mounted on the lever shaft 21 adjacent to the lever 22. A one-way clutch (not shown) is provided between the clutch arm 23 and the pot roller 16, and when the connecting rod 14 reciprocates and the clutch arm 23 swings, this swing is transmitted only in one direction. The pot roller 16 is configured to rotate intermittently in the direction indicated by arrow A in the figure. On the other hand, the roller lever 25 on the arm shaft 24 disposed between the cam shaft 10 and the lever shaft 21 has its free end roller 26 facing the cam 10a provided on the cam shaft 10. In addition, a transfer roller 28 is provided at the free end of the pair of left and right roller arms 27 that are pivotally attached to the arm shaft 24.
is rotatably supported. What is designated by the reference numeral 29 is a swing roller disposed with a large number of roller groups interposed between the plate cylinder and the roller arm 2.
7, the transfer roller 28 is configured to reciprocate between the swing roller 29 and the pot roller 16. Reference numeral 30 designates an air cylinder that holds the transfer roller 28 in contact with the swing roller 29 by extending the working end of the piston rod into contact with the other free end of the roller lever 25.

In the ink transfer mechanism configured as described above, the rotation of the plate cylinder driven from the driving side is transmitted to the drive shaft 2 via a gear group (not shown) and gears 3 and 4, and further to the bevel gears 8 and 9 and the worm. 12,
The signal is transmitted to the camshaft 10 via the worm wheel 11. When the camshaft 10 rotates, the connecting rod 14 reciprocates under the action of the crank 13, and the pot roller 16 rotates intermittently in the direction of arrow A via the lever 22, clutch arm 23, and one-way clutch (not shown). Also, due to the rotation of the camshaft 10, the cam 10
Since the large diameter part and the small diameter part of a contact the roller 26 alternately during one rotation, the roller lever 25 swings, and therefore the roller arm 27 swings and the transfer roller 28 is moved against the pot roller 16. It reciprocates between the swing roller 29 and the swing roller 29. Due to this movement, the ink 20 in the ink fountain 19 flows out from the gap between the circumferential surface of the ink fountain roller 16 and the ink blade 17 due to the rotation of the fountain roller 16, and adheres to the circumferential surface of the fountain roller 16. This ink is then transferred to a swing roller 29 by a reciprocating transfer roller 28, and is further supplied to the plate surface on the plate cylinder via a large number of roller groups.

In the ink transfer mechanism of the conventional inking device configured and operated as described above, the rotation of the drive shaft 2 is transmitted to the worm shaft 7 by the bevel gears 8 and 9, and the worm shaft 7 is connected to the distant cam shaft 10. worm 12 and worm foil 1.
1, the drive accuracy is reduced due to bumps in the bevel gear or torsion of the worm shaft 7, resulting in uneven ink transfer and printing problems such as streaks. Also, there was a drawback that the cost increased due to the complicated structure.

The present invention has been made in view of the above points, and includes a worm-type rotation transmission device driven by a spur gear from the plate cylinder side supported on the frame side, and a cam fixed to the output shaft of the worm type rotation transmission device. The cam lever and the swing center shaft of the transfer roller support arm are connected by a link, and the clutch drive shaft connected to the pot roller by a one-way clutch and the lever on the output shaft are connected by a link. The present invention provides an inking device for a rotary printing press, which stabilizes the drive of the transfer roller and the pot roller with high precision and improves the quality of printed matter. Embodiments of the present invention will be described in detail below with reference to the drawings.

This embodiment shows an example in which the present invention is implemented in a lower printing device of a double-sided paper web rotary printing press. Fig. 2 is a side view of the ink transfer mechanism, and Fig. 3 is an exploded cross-section of the fountain roller drive section of the ink transfer mechanism. Similarly, FIG. 4 is a developed sectional view of the transfer roller drive section, and FIG. 5 is a partially cutaway plan view of the worm type rotation transmission device. In the figure, the lower printing device of the double-sided paper rotary printing machine includes:
A plate cylinder (not shown) is provided with a printing plate attached to its circumferential surface and is rotated from the driving side. Below this plate cylinder, a swinging roller 30 is arranged to rotate an ink forming roller, a kneading roller, etc. It is disposed so as to be pivotally supported by the left and right frames 31 via a large number of roller groups that are in contact with the left and right frames 31 . Diagonally below the swinging roller 30, a worm type rotation transmission device, generally designated by the reference numeral 32, is connected to the housing 3.
3 is fixed to one frame 31 with bolts 34, and the swing roller 3 is attached to this housing 33.
A spur gear 36 is fixed with a nut 37 and a key 38 to a protrusion from the housing 33 of a worm shaft 35 as an input shaft which is supported in parallel with the axial direction of the input shaft. The spur gear 36 meshes with an intermediate gear 40 loosely mounted on a stud 39 protruding from the frame 31, and this intermediate gear 40 is drivingly connected to the plate cylinder by a group of spur gears including spur gear 40a. As a result, the worm shaft 35 is driven from the plate cylinder side. A worm 41 is fixed to the worm shaft 35 by a key 42, and the worm 41 is mounted on a worm wheel shaft 43 as an output shaft which is orthogonal to the worm shaft 35 and pivotally supported by the housing 33. It meshes with 44. The worm wheel shaft 43 projects to both sides of the casing 33, and a cam 45 for driving a transfer roller is prevented from coming off the shaft 43 with a nut 46 and is fixed with a key 47 at the projection on one side of the worm wheel shaft 43. . Further, a drive lever 48 for driving the pot roller is fixed to the other protrusion of the worm wheel shaft 43 by split fastening.

On the other hand, diagonally below the swinging roller 30, a pot roller 49 is rotatably supported by the left and right frames 31 via ball bearings 51 fitted in a bearing case 50, and the circumferential surface of the pot roller 49 and the ink The blade 52 and the left and right ink wells 53 form an ink fountain 54 in the shape of a triangular gutter that opens upward. A stud 55 with a flange is fixed to the frame 31 below the ink fountain 54 and protrudes to the outside of the frame 31.
An outer metal 56 is fitted and fixed with a nut 57. Further, one end of a connecting plate 59 is fixed to a cap 58 which is placed on the tip of the stud 55. Reference numeral 60 denotes a clutch drive shaft which is provided on the same axis as the axis of the pot roller 49, and is rotatably supported by a bearing at one end of the out metal 56. The tip portion is supported by a connecting plate 59. A swing lever 61 fixed to the tip of the clutch drive shaft 60
A swing lever 61 is provided between the drive lever 48 and the drive lever 48.
The alignment bearing 62 is provided by a telescopically adjustable connecting rod 62 that forms a bendable link with the centering rod 62.
a and 62b, and when the worm wheel shaft 43 rotates, the drive lever 48
The swing lever 61 is configured to swing by the crank action. A box-shaped clutch drive lever 63 is fixed to the other end of the clutch drive shaft 60, and a one-way lever 63 fixed to the protruding end shaft of the pot roller 49 with a key 64 is attached to the concave free end thereof. Roller 66 of clutch 65 is engaged. The one-way clutch 65 has a well-known structure and transmits rotation only in one direction, and in this device,
It is constructed so that the swinging motion of the clutch drive lever 63 is transmitted only in the counterclockwise direction in FIG.

Further, the pot roller 49 and the power transmission device 32
An arm shaft 67 serving as a pivot axis of a transfer roller support arm, which will be described later, is rotatably supported on the left and right frames 31 via pushers, and is fixed to both ends thereof. A transfer roller 69 is rotatably supported via a bearing 70 at the free end of a roller arm 68 serving as a transfer roller support arm. Further, a swinging lever 71 is pivotally attached to a protrusion outside the frame of the arm shaft 67, and a cam lever 72 is pivotably mounted to the free end of the swinging lever 71 and the housing 33. is connected to the free end side by a connecting rod 73 having alignment bearings 73a, 73b at both ends. A cam follower 74 is pivotally attached to the free end of the cam lever 72, and is in contact with the cam surface of the cam 45. By providing a small diameter portion and a large diameter portion on the cam surface, the cam 45 is When rotated, the cam lever 72 swings, and the transfer roller 69 moves to the swing roller 30 via a link consisting of a connecting rod 73 and a swing lever 71.
The worm wheel shaft 43 is configured to reciprocate once per rotation between the worm wheel shaft 43 and the pot roller 49.
75 is mounted on a spring shaft 78 between a lever 76 fixed to the arm shaft 67 and a stud 77 implanted in the frame 31, and applies a rotational force to the cam lever 72 in the direction of pressing the cam follower 74 against the cam surface. It is a compression coil spring.

The operation of the inking device configured as above will be explained. The rotation on the drive side is transmitted to the plate cylinder, and the rotation of the plate cylinder is transmitted to the worm shaft 35 via a group of spur gears (not shown), a spur gear 41, and an intermediate gear 40.
The rotation of the worm shaft 35 is decelerated and transmitted to the worm wheel shaft 43, and the rotation of the worm shaft 35 is transmitted to the worm wheel shaft 43.
and rotates. As the drive lever 48 rotates, the connecting rod 62 reciprocates due to its crank action, and the swing lever 61 swings, so that the clutch drive lever 63 coaxially therewith swings. Therefore, the pot roller 49 is intermittently rotated by the action of the one-way clutch 65, which has the roller 66 engaged with the clutch drive lever 63. On the other hand, as the cam 45 rotates, the cam lever 72 with the cam follower 74 in contact with it swings, and the swinging lever 7 connected with the connecting rod 73 swings.
1 swings, and the swinging of the roller arm 68 coaxial therewith causes the transfer roller 69 to reciprocate between the rollers 49 and 30 so as to contact the pot roller 49 and the shaker roller 30 alternately. At this time, since the shaking roller 30 and a group of rollers (not shown) are rotating, the ink stored in the ink fountain 54 flows out from the gap between the circumferential surface of the fountain roller 49 and the ink blade 52 due to the rotation of the fountain roller 49, and is transferred to the fountain roller 49. The ink adheres to the circumferential surface of the plate cylinder 49, and after being transferred to the swinging roller 30 by the transfer roller 69, the ink is supplied to the plate surface on the plate cylinder via the roller group.

In the operation of the inking device performed as described above, the plate cylinder and the worm shaft 35 are drivingly connected by a spur gear, and the rotation transmission device 32 simultaneously decelerates and changes the direction of the rotation of the worm shaft 35. After that, the link transmits the drive between the intermittent rotation of the pot roller and the reciprocating motion of the transfer roller, so unlike conventional transmission systems, bevel gears reduce drive accuracy and rotation of long shafts. There will be no twisting of the shaft due to this.

Although this embodiment shows an example in which the present invention is applied to the lower printing device of a double-sided paper-fed rotary printing machine, it can also be applied to the inking device of various types of paper-fed and sheet-fed rotary printing machines, as well as the upper printing device of the same machine. It can be implemented similarly.

As is clear from the above description, according to the present invention, in an inking device of a rotary printing press, a worm type rotation transmission device driven by a spur gear from the plate cylinder side is supported on the frame side and fixed to the output shaft thereof. A lever driven by a cam and the swinging center axis of the transfer roller support arm are connected by a link, and a clutch drive shaft connected to the pot roller by a one-way clutch is connected to the lever on the output shaft by a link. By connecting the plate cylinder side, urn roller, and transfer roller, no bevel gears or long torsion transmission shafts are used in the drive system, and everything is composed of spur gears, worm-type rotation transmission devices, and tension shafts. This improves drive accuracy, and the quality of printed matter is significantly improved because the ink transfer and feed shots are not transmitted to the plate cylinder.The structure is also simplified, making the machine smaller and more compact. It is possible to reduce costs. Furthermore, because the ink transfer and feed are completely synchronized, the transfer and feed can be changed in relation to the rotation of the machine, for example when printing thinly all over the page or printing with few patterns. When desired, simply inserting a variable speed mechanism between the main drive and this device allows them to be completely synchronized, making it easy to obtain the desired print.

[Brief explanation of the drawing]

FIG. 1 is a side view of an ink transfer mechanism in an inking device of a conventional rotary printing press, FIGS. 2 to 5 show an embodiment of the inking device of a rotary printing press according to the present invention, and FIG. Side view of the mechanism, 3rd
4 is a developed sectional view of the urn roller drive section of the ink transfer mechanism, FIG. 4 is a developed sectional view of the transfer roller drive section, and FIG. 5 is a partially cutaway plan view of the worm type rotation transmission device. 31...Frame, 32...Worm type rotation transmission device, 35...Worm shaft, 36...Spur gear, 40...Intermediate gear, 43...Worm wheel shaft, 45...Cam,
48... Drive lever, 49... Pot roller, 60... Clutch drive shaft, 61... Rocking lever, 62... Connection rod, 65... One-way clutch, 67... Arm shaft, 6
8... Roller arm, 69... Transfer roller, 71... Rocking lever, 72... Cam lever, 73... Connection rod.

Claims (1)

[Claims] 1. A worm type rotation transmission device 32 is fixed to the frame 31, with a worm shaft 35 drivingly connected to the plate cylinder through a spur gear 36 as an input shaft, and a worm wheel shaft 43 meshing with the worm 41 of this shaft as an output shaft.
The transfer roller drive cam 45 and the pot roller drive lever 48 are fixed to the worm wheel shaft 43, and the swing center shaft 6 of the transfer roller support arm 68 is fixed.
7 and a cam lever 7 that swings due to the drive of the cam 45.
2 are connected by links 71 and 73, and the pot roller 49
A clutch drive shaft 60 located on the same axis as the pot roller and connected by a one-way clutch 65 and the pot roller drive lever 48 are connected by links 61 and 62.
An inking device for a rotary printing press, characterized in that the inking device is connected by.