JPS62191151A - Printing plate film tightly winding device of corrugated board folded box machine - Google Patents

Abstract

PURPOSE:To make the spreading in an optimum state of a printing plate by one worker possible and to obtain the remarkably beautiful finish of a printing surface, by connecting a winding axis to a single motor using a differential gear mechanism, a worm gear mechanism, and a torque limiter from an appropriate conduction means. CONSTITUTION:The hook bar 21 at one end of the film 18 to which a printing plate 19 is adhered, is obliquely inserted into the groove 12a of a plate cylinder 12 and securely detained between a presser bar 16 and the inlet part of a groove 12a. When the plate cylinder 12 is rotated and a winding axis 13 comes nearly, the other hook bar 20 of a printing plate film 18 is obliquely pressed into the groove 13a of the winding axis 13 and held between a presser bar 15 and the inlet of the groove 13a. The film 18 is wound along the peripheral surface of the plate cylinder 12 to be in a loosened state. By driving a motor 1, the winding axis 13 is rotated counterclockwise via a torque limiter 2, a driving shaft 3, worm gear mechanisms 4, 5, a differential gear mechanism 7, the gear 10 of driving shaft 8, and an idler gear 11. The printing plate 18 becomes in a thoroughly stretched state. If it becomes not less than a tension state, the torque limiter 2 is actuated.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a printing plate film tightening device for a corrugated box making machine, and more specifically, it relates to a printing plate film tightening device for a corrugated box making machine, and more specifically, a film on which a printing plate is fixed is attached to the outer peripheral surface of a plate cylinder. The present invention relates to a device that automatically tensions and tightens the winding with an appropriate tension when the winding is carried out.

(Prior art) Conventionally, in the printing unit of a corrugated box making machine, a printing plate made of a rubber plate or a resin plate is attached to the surface of a thin film made of synthetic resin, and this printing plate film is attached to the outer peripheral surface of the plate cylinder. Two grooves are bored at appropriate intervals in one of the grooves, one end of which is fixed to the printing plate film, and the other groove is which which is fixed to the other end of the printing plate film. The winding shaft is rotatably mounted, and by rotating the winding shaft, the printing plate film wound around the outer peripheral surface of the plate cylinder is tensioned. A ratchet ratchet wheel feed mechanism is used as the mechanism for rotating this winding shaft, and the feed of the ratchet pawl is operated by an operator by turning a handle.

(Problem to be solved) However, with this ratchet type wheel feeding mechanism, the degree of tension of the printing plate film is determined in the smallest unit by the feed amount of one tooth. There was some variation in the tension of the printing plate due to individual differences depending on the operator. However, the tension of the printing plate had the disadvantage that it affected the printed surface of the product slightly, resulting in uneven printing. In addition, at this time, the tension work of the printing plate film was usually carried out by two workers working together, which created a problem in terms of abbreviation.

(Solution) Two grooves are bored at appropriate intervals on the outer peripheral surface of the plate cylinder, one end of the printing plate film is locked in one of the grooves, and the other end of the printing plate film is locked in the other groove. A winding shaft having a groove for locking the end is attached to the rotary shaft. By rotating the winding shaft that locks the other end of the printing plate film, the printing plate film wound around the outer circumferential surface of the printing cylinder is tensioned. The winding shaft is connected to a separate motor separate from the machine drive source via a differential gear mechanism, a worm gear mechanism, and a torque limiter through an appropriate transmission means.

(Function) In order to wind the printing plate film onto the printing cylinder under appropriate tension, a winding shaft that locks one end of the printing plate film is connected to an independent motor via a torque limiter, a worm gear mechanism, and a differential gear @&. In this case, the torque limiter is used to avoid overload, and the worm gear mechanism is used to prevent reversal due to the reaction of the printing plate film extension. The barrel and the winding shaft rotate together in synchronization.

(Example) An example of an apparatus for carrying out the present invention will be explained in detail with reference to the drawings. In FIG. is fitted with a torque limiter 2 configured to slip in case of overload. Reference numeral 3 denotes a drive shaft connected to the torque limiter 2, and a worm 4 is attached to the other end of the drive shaft 3. 5 is the worm 4
A worm gear 6 meshing with the worm gear 6 is a drive shaft having the worm gear 5 fixed to one end thereof, and the other end of the drive shaft 6 is connected to a differential gear mechanism 7 which rotates in synchronization with the drive source of the machine main body. ing. Reference numeral 8 denotes a drive shaft driven by the differential gear 1a@7. This drive shaft 8 is rotatably supported in the plate cylinder 12, and a gear 10 is fixed to the other end of the drive shaft 8. There is.

Reference numeral 11 denotes an idler gear that meshes with the gear 10, and this idler gear 11 engages with teeth provided on the outer peripheral surface of the winding shaft 13.

In FIGS. 1 and 3, the winding shaft 13 is rotatably mounted in a groove 12 bored on the outer periphery of the plate cylinder 12, and the winding shaft 13 is rotatably mounted on the outer periphery of the plate cylinder 12. A groove 13 into which one end of a printing plate film (described later) is fitted! L is provided, and the entrance portion 13b of this groove 13λ is formed to be smaller than the inner diameter of this groove, as shown in FIG.

Reference numeral 14 denotes a spring fitted into the groove 13 of the winding shaft 12, and a presser rod 1 is inserted between the spring 14 and the entrance of the groove.
5 is inserted, and constantly applies an elastic force to the presser rod 15. In FIGS. 1 and 5, reference numeral 16 denotes a presser rod that is loosely attached to a groove 12m formed in the outer circumferential surface of the plate cylinder 12, and the presser rod is always elastically pressed against the outer circumferential surface by a spring 17. is energized.

Stamp film 18 with stamp 19 affixed as shown in Figure 6
has hook rods 20 and 21 fixed to both ends thereof, respectively.

An example of the apparatus for carrying out the present invention is configured as described above. Next, its operation will be explained. First, the work of attaching the printing plate film 1B to the plate JpH 2 will be described. The hooking rod 21 at one end of the film 18 is inserted into the groove 12 of the plate cylinder 12 at an angle. This pull! t'121 is securely locked between the presser bar 1'6 and the entrance of the groove 12λ by the compression spring 17.
Next, by hooking the other end of the printing plate film 1B and holding '820 in your hand, press a foot switch (not shown) with your foot, and the plate cylinder 12 will rotate. When the winding shaft 13 comes near, the other hook of the printing plate film 18 is inserted into @13@ of the winding shaft 13 by pushing the rod 20 diagonally. The hook rod 20 is held elastically by a spring 14 between the presser rod 15 and the entrance of the groove 13m. At this time, the film 18 is wound along the outer peripheral surface of the plate cylinder 12, but is still in a slightly loosened state. Then press the button (
(not shown) to drive the motor 1. When this motor 1 is driven, a torque limiter 2, a drive shaft 3, a quorum gear mechanism 4, 5, a differential gear mechanism 7, a gear 10 of a drive shaft 8,
In FIG. 3, the winding shaft 13 passes through the idler gear 11.
Rotate counterclockwise.

For this reason, the printing plate film 18 becomes sufficiently stretched. Here, when the printing plate film 18 reaches an appropriate tension state (
In this case, the torque limiter 2 is activated and slip occurs, and the printing plate film 18 is no longer stretched.In this case, however, due to the elasticity of the printing plate film 18, the stretching of the film 18 is reversed. As a result of this action, the drive shaft 6 tends to rotate in the opposite direction via the gear 11, the gear 10, and the differential gear mechanism 7, but this rotation is prevented by the worm gear mechanism 5.4. On the other hand, the printing plate film 18 can be removed from the printing cylinder 12 by performing the above-mentioned installation operation in reverse order.

By the way, when the machine is in normal operation, the plate cylinder 12 is rotated by a machine drive source (not shown) of the corrugated box making machine via a suitable transmission path. (The plate cylinder 12 rotates clockwise in FIG. 133.) At this time, the differential gear mechanism 7 slips due to the operating speed of the differential gear mechanism 7, and the rotational driving force of the plate cylinder 12 is transferred to the worm gear mechanism 5, 4 and the motor 1. The idler gear 10 and the take-up shaft 13 meshing with the idler gear rotate together with the plate cylinder 12 via a gear 10 attached to the drive shaft 8, which is not transmitted to the side.

(Effects) As described above, the present invention connects the winding shaft that controls the winding of the printing plate film to the machine drive source through a differential gear mechanism, a worm gear mechanism, and a torque IJ transmitter through an appropriate transmission means. Since it is connected to a separate independent motor to drive it, compared to conventional equipment, the wrapping and tightening work after winding the printing plate film around the outer circumferential surface of the plate cylinder can be done automatically by one worker. This operation allows the printing plate film to be stretched in an optimal state, and produces effects such as an extremely beautiful finished printing surface.

[Brief explanation of drawings]

The drawing shows one example of an apparatus for carrying out the present invention.
The figure is a side view of the main parts when the printing plate film is attached to the plate cylinder,
Fig. 2 is an explanatory diagram showing the drive path of the printing plate film tightening device, Fig. 3 is a view taken along arrows A and A in Fig. 2, Figs. 4 and 5 are enlarged views of the main parts of Fig. $1, FIG. 6 is a side view of the printing plate film. DESCRIPTION OF SYMBOLS 1... Motor, 2... Torque limiter, 4... Worm, 5... Worm gear, 7... Differential gear mechanism, 12... Plate cylinder, 12m... Groove, 13... ... Winding shaft, 131... Groove, 18... Printing film Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] One end of the printing plate film is locked in one of two grooves bored at appropriate intervals on the outer peripheral surface of the printing cylinder, and the other end of the printing plate film is locked in the other groove. A corrugated box making machine, in which a winding shaft having a groove is rotatably mounted, and by rotating the winding shaft, a printing plate film wound around the outer peripheral surface of a plate cylinder is tensioned. In the printing plate film tightening device, the winding shaft is connected to a separate motor separate from the machine drive source via a differential gear mechanism, a worm gear mechanism, and a torque limiter from an appropriate transmission means. This is a printing plate film tightening device for a corrugated box making machine.