JPH0667613B2 - Multicolor printing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotary multicolor printing machine used for printing labels and the like.

(Prior Art) In a rotary-type multicolor printing machine such as a label printing machine, an impression cylinder and a drive gear are provided on a drive shaft, and the same peripheral speed as that of the impression cylinder is provided by interlocking with the drive gear via a plate cylinder gear. There is a type in which a plurality of plate cylinders rotating in the circumferential direction are arranged at equal intervals in the circumferential direction, and printing is performed by a plate mounted on each plate cylinder on an object to be printed wound around an impression cylinder.

In this type of printing machine, conventionally, it is common to mount a plate on the entire outer circumference of each plate cylinder, continuously rotate the impression cylinder and the plate cylinder during printing, and print while continuously feeding the material to be printed. is there.

(Problems to be Solved by the Invention) Conventionally, since the plate is mounted on the entire circumference of the plate cylinder, it is necessary to prepare a plate cylinder having a diameter corresponding to each size of the plate. Further, if the diameter of the plate cylinder changes, it is necessary to make the peripheral speed the same as that of the impression cylinder. Therefore, it is necessary to replace the plate cylinder gear with the plate cylinder and adjust the position of the shaft. Therefore, there is a drawback that preparation for printing, such as label printing, which requires printing in small amounts in various types, is very troublesome.

Also, in the case of multicolor printing, the color matching is adjusted for each plate while operating, but since the printing material is sent continuously at all times, a considerable amount of the printing material will not be printed until the color matching is completed. However, there is a drawback that a large amount of waste paper is generated.

The present invention has been made in view of such problems in the related art, and an object of the present invention is to provide a multi-color printing machine in which the plates can be easily replaced and less waste paper occurs.

(Means for Solving the Problem) As a means therefor, the present invention provides a plate cylinder 8 provided with a plate cylinder gear 9 that engages with the drive gear 3 in the circumferential direction on the outer periphery of the drive gear 3 that interlocks with a drive source. A plurality of printing materials 5 arranged at equal intervals on the printing drum 4 and wound around the impression cylinder 4 and sequentially fed over the plurality of plate cylinders 8 by the rotational driving of the impression cylinder 4.
In a multicolor printing machine configured to print by contacting the plates 12 mounted on each plate cylinder 8, the plate cylinders 8 have the same diameter, and a part of the outer circumference of each plate cylinder 8 The plate 12 is mounted within a certain range from the reference position A, and the transmission shaft 1 is used to transmit the power from the drive source to the impression cylinders 4 so that the impression cylinders 4 rotate at the same peripheral speed as the plate cylinders 8. The transmission gear 23 that meshes with the drive gear 3 is fixed to one end of the transmission shaft 1, and the rotational power from the transmission shaft 15 is connected to the other end of the transmission shaft 1 via the clutch 25 to connect to the impression cylinder 4. The impression cylinder transmission system 26 configured by providing the transmission gear 24 for transmitting rotational power is provided, and the clutch 25 is provided on the ratchet gear 27 fixed to the transmission gear 24 side and the transmission shaft 15 side. Power is transmitted from the transmission shaft 15 to the ratchet gear 27 by being disengageably engaged with the ratchet gear 27. During ratchet pawl 28 constituted by a ratchet pawl 28, the impression cylinder transmission system 26, the plate 12 of the plate cylinder 8 is in contact with the substrate 5 to
Is engaged with the ratchet gear 27, and a cam engaged with the ratchet pawl 28 so that the ratchet pawl 28 is disengaged from the ratchet gear 27 while the plate 12 is not in contact with the substrate 5.
34 is provided.

(Operation) When the drive shaft 2 is rotated in the direction indicated by arrow a by the drive source, each plate cylinder 8 is moved through the plate cylinder gear 9 that engages with the drive gear 3 through the plate cylinder b.
It rotates continuously in the direction of the arrow. On the other hand, the disk 30 rotates in the direction of the arrow c via the transmission gear 23 and the transmission shaft 15 that mesh with the drive gear 3, and the cam roller 33 of the ratchet pawl 28 rolls on the cam 34. While the section C of each plate cylinder 8 in which the plate 12 is not mounted corresponds to the material to be printed 5, the cam roller 33 rolls on the large diameter portion 35 of the cam 34, so that the ratchet pawl 28 moves the ratchet gear 27. Is disengaged and the clutch 25 is disengaged. Therefore, the plate cylinder 8 only rotates, and the impression cylinder 4 and the printing medium 5 remain stopped.

When the starting end of the plate 12 comes to a position where it comes into contact with the material to be printed 5, the cam roller 33 is disengaged from the large diameter portion 35 of the cam 34, and the ratchet pawl is released.
28 engages with the ratchet gear 27 and connects the clutch 25, so that the impression cylinder 4 rotates in the direction indicated by the arrow a through the cylinder shaft 20, the transmission gear 24, and the impression cylinder gear 7 to feed the material 5 to be printed. Therefore, the printing plate 12 is wound around the impression cylinder 4 and comes into contact with the printing target 5 to be printed 39. Then, when the end of the plate 12 is reached, the cam roller 33 rides on the large diameter portion 35 of the cam 34 and the ratchet pawl 28 is disengaged from the ratchet gear 27, so that the clutch 25 is disengaged, and the impression cylinder 4 and the substrate 5 are stopped. .

Thereafter, similarly, the impression cylinder 4 and the printing material 5 intermittently operate, and the printing material is sequentially fed over the plurality of plate cylinders 8 to intermittently print on the printing material 5 as shown in FIG.
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When replacing the plate 12, the plate cylinder 8 may be used as it is, and the plate 12 may be mounted so as to be aligned with the reference position A, and there is no need to replace the plate cylinder 8 and the plate cylinder gear 9 and the accompanying adjustments. .

In addition, since there is a time during which the impression cylinder 4 is stopped and the feeding of the material to be printed 5 is stopped at the time of color matching between the respective plates, it is possible to reduce the occurrence of waste paper.

(Example) Hereinafter, the present invention will be described in detail with reference to the illustrated example.
In FIG. 2 and FIG. 2, 1 is a pair of left and right frames, and a drive shaft 2 which rotates in conjunction with a drive source (not shown), for example, an electric motor, is mounted in the center of the frame 1. A large-diameter drive gear 3 is fixedly mounted on the drive shaft 2, and
An impression cylinder 4 having the same diameter as this is rotatably fitted. The impression cylinder 4 guides the label 5 or the like to be printed by being rotatably driven, so that the impression 5 is sandwiched between the nip roll 6 supported by the frame 1 and fed. Has become. An impression cylinder gear 7 identical to the drive gear 3 is concentrically fixed to one end of the impression cylinder 4.

Reference numeral 8 denotes a plate cylinder. Four plate cylinders 8 having the same diameter are arranged on the outer circumference of the drive gear 3 and the impression cylinder 4 at equal intervals in the circumferential direction. Each plate cylinder 8 is fixed to a rotary shaft 10 together with a plate cylinder gear 9, and the rotary shaft 10 is detachably attached to a bearing 11 of the frame 1. The plate cylinder gear 9 is constantly meshed with the drive gear 3. As shown in FIGS. 3 and 4, each plate cylinder 8 has
A plate 12 made of synthetic resin is detachably mounted by screws 13 or the like so as to cover a certain range from the reference position A. The mounting range of the plate 12 is preferably a part of the plate cylinder 8, for example, about 160 ° in the circumferential direction from the reference position A. Therefore, within this range, the plates 12 of various sizes can be mounted on the plate cylinder 8 in alignment with the reference position A. An inking device 14 is provided on the frame 1 corresponding to each plate cylinder 8 so as to apply ink to each plate 12.

Reference numeral 15 is a transmission shaft installed on the upper part of the frame 1, and as shown in FIG. 5, one end is connected to the frame 1 via the bearing 16 and the bearing case 17, and the other end is connected to the cylindrical shaft 20 via the bearings 18 and 19. Each is rotatably supported, and the cylinder shaft 20 is rotatably supported by the frame 1 via a bearing 21 and a bearing case 22. Transmission shaft
The transmission gear 23 that meshes with the drive gear 3 is provided on one end side of 15.
However, the cylinder shaft 20 has a transmission gear 24 that meshes with the impression cylinder gear 7.
Are provided respectively, and a ratchet type clutch 25 is interposed between the transmission shaft 15 and the cylinder shaft 20. The transmission gears 23, 24 are the same as the plate cylinder gear 9, and therefore
If the clutch 25 is connected, the impression cylinder 4 and the plate cylinder 8 can rotate at the same peripheral speed. In addition, the transmission shaft 15 and the transmission gears 23,2
4, the cylinder shaft 20 and the like constitute an impression cylinder transmission system 26.

The clutch 25, as shown in FIG. 5 and FIG.
Has a ratchet gear 27 fixed to one end thereof and a ratchet pawl 28 which can be engaged with and disengaged from the ratchet gear 27.
The ratchet claw 28 is pivotally attached to the disk 30 by a support shaft 29,
A spring 32 stretched between the disk 30 and a spring hooking pin 31 urges the ratchet gear 27 side. Disc 30 is the transmission shaft
It is fixed at 15.

The clutch 25 is adapted to be opened and closed by operating a cam roller 33 provided at an intermediate portion of the ratchet pawl 27 with a cam 34. That is, in the cam 34, when the cam roller 33 is disengaged from the large diameter portion 35, the ratchet pawl 28 engages with the ratchet gear 27 and the clutch 25 is engaged. This is a section B where the plate 12 of the plate cylinder 8 comes into contact with the substrate 5. The cam 34 is composed of a fixed cam 36 fixed to the bearing case 22 and a movable cam 37 whose angle can be freely adjusted. The fixed cam 36 sets the connecting position of the clutch 25 and the movable cam 37 sets the disconnecting position. It The connection position coincides with the reference position A, and the disconnection position changes depending on the size of the plate 12 in the circumferential direction. While the clutch 25 is disengaged, the impression cylinder 4 is stopped and the material to be printed 5 is not fed.

In addition, the position of each plate cylinder 8 is as follows, where the number of plate cylinder gears is nz
The number of drive gears between the plate cylinder gears 9 is set to 1/2 anz (a is a constant).

In the above-described embodiment, the single cylinder type is used as the impression cylinder 4, but as shown in FIG.
The same can be applied to a multi-body type equipped with.

Also, each gear is preferably a helical gear.

(Effect of the Invention) According to the present invention, each plate cylinder 8 has the same diameter, and a part of the outer circumference of each plate cylinder 8 is covered with a plate 12 within a certain range from the reference position A.
Is mounted, and the power from the drive source is transmitted to the impression cylinder 4 by the impression cylinder 4 so that the impression cylinder 4 rotates at the same peripheral speed as that of each plate cylinder 8. Clutch for intermittent transmission
25 is provided and is connected to the power transmission system between the clutch 25 and the drive source while the plate 12 of each plate cylinder 8 is in contact with the substrate 5, and is disconnected while the plate 12 is not in contact with the substrate 5. As described above, since the cam 34 that is interlocked with the clutch 25 is provided to connect and disconnect the clutch 25, the handling at the time of plate replacement is very easy, and the occurrence of wasted paper at the time of color matching can be reduced. In particular, the impression cylinder transmission system 26 is fixed to one end side of the transmission shaft 1 with the transmission gear 23 meshing with the drive gear 3, and the other end side of the transmission shaft 1 is provided with rotational power from the transmission shaft 15 to the clutch 25. A transmission gear 24 that intermittently transmits rotational power to the impression cylinder 4 by being connected via the clutch is provided, and the clutch 25 is
Ratchet gear 27 fixed to the transmission gear 24 side and the transmission shaft
The ratchet gear 27 is provided on the 15 side and engages with the ratchet gear 27 in a disengageable manner to disengage the ratchet gear 27 from the transmission shaft 15.
And a ratchet pawl 28 for transmitting power to the plate cylinder 8. The ratchet pawl 28 engages with the ratchet gear 27 while the plate 12 of each plate cylinder 8 is in contact with the printing target 5, and the plate 12 does not contact the printing target 5. Since the ratchet pawl 28 is engaged and disengaged by the cam 34 so that the ratchet pawl 28 is disengaged from the ratchet gear 27, the structure is simple and the structure is compact for a multicolor printing machine. It can be installed at low cost without increasing the size of the machine and requiring no complicated control.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a side view, Fig. 2 is a plan view, Fig. 3 is a perspective view of a plate cylinder, Fig. 4 is an enlarged view of essential parts, and Fig. 5 is an impression cylinder. FIG. 6 is a sectional view of a transmission system, FIG. 6 is a sectional view of a clutch, FIG. 7 is a plan view of a material to be printed, and FIG. 3 ... Drive gear, 4 ... Impression cylinder, 5 ... Printed material, 8 ...
... plate cylinder, 12 ... plate, 25 ... clutch, 26 ... impression cylinder transmission system, 34 ... cam, A ... reference position.

Claims (4)

[Claims] 1. A plate cylinder (8) having a plate cylinder gear (9) meshing with the drive gear (3) on the outer periphery of a drive gear (3) interlocking with a drive source at regular intervals in the circumferential direction. A plurality of plate cylinders (8) are arranged on each of the printing drums (5) which are arranged and wound around the impression cylinders (4) and are sequentially fed over the plurality of plate cylinders (8) by the rotational driving of the impression cylinders (4). In a multicolor printing machine adapted to print by contacting the plate (12) mounted on the plate cylinder (8), the plate cylinders (8) have the same diameter, and a part of the outer periphery of each plate cylinder (8) Plate (12) within a certain range from the reference position (A)
Of the transmission shaft (15) so as to transmit the power from the drive source to the impression cylinder (4) so that the impression cylinder (4) rotates at the same peripheral speed as each plate cylinder (8). While fixing the transmission gear (23) that meshes with the drive gear (3) at one end side,
To the other end of the transmission shaft (15), a transmission gear (which transmits rotation power intermittently to the impression cylinder (4) by intermittent rotation of the rotation power from the transmission shaft (15) via the clutch (25). 24) is provided and an impression cylinder transmission system (26) is provided, and the clutch (2
5) is engaged with the ratchet gear (27) fixed to the transmission gear (24) side and the ratchet gear (27) provided on the transmission shaft (15) side so as to be disengageable. ) And a ratchet pawl (28) for transmitting power from the ratchet gear (27) to the ratchet gear (27), and the impression cylinder transmission system (2
In 6), while the plate (12) of each plate cylinder (8) is in contact with the material to be printed (5), the ratchet claw (28) has a ratchet gear (27).
A cam (34) that engages with the ratchet pawl (28) so that the ratchet pawl (28) is disengaged from the ratchet gear (27) while the plate (12) is not in contact with the printing object (5). ) Is provided, a multicolor printing machine. 2. A drive shaft (2) having a drive gear (3) fixed thereto.
The impression cylinder (4) is loosely fitted onto the top of the impression cylinder (4), and the pressure is applied to the opposite side of the drive gear (3) of the impression cylinder (4) to the transmission gear (24) of the impression cylinder transmission system (26). 2. Multicolor printing machine according to claim 1, characterized in that the cylinder gear (7) is fixed. 3. A single impression cylinder (4), wherein each plate cylinder (8) is arranged on the outer circumference of this impression cylinder (4) at equal intervals in the circumferential direction. Multicolor printing machine described in. 4. The cam (34) according to claim 1, wherein the cam (34) has a fixed cam (36) and a movable cam (37) provided so as to be rotatable in the circumferential direction. Multicolor printing machine.