JPS5812187B2 - Web entanglement prevention device in the folding machine of a rotary printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a web entanglement prevention device for a folding machine of a rotary printing press, which prevents the web from being caught in the folding machine when a paper jam occurs.

In a printing operation using a rotary printing press, a web is supplied to a printing unit by a paper feeder and printed, and then the web is dried and cooled, sent to a folding machine, folded into a predetermined size, and discharged.

FIG. 1 is a front view showing an outline of a folding machine of a conventional rotary printing press, in which a strip-shaped web 1 printed by a printing unit is fed into a folding machine 2 from the direction indicated by arrow A in the figure, not shown. It is turned in a right angle direction by a turn bar and sent to a former 4 via a drag roller 3, and
After being folded in half in the width direction by this former 4, it is sent to a folding cylinder 7 via a lead roller 5 and a nipping roller 6, and is cut into predetermined dimensions between the folding cylinder 7 and a cutting cylinder 8 that is in contact with it. After that, it is folded in half from the center between the folding cylinder 7 and the gripping cylinder 9, which is also in contact with the folding cylinder 7.

The half-folded printed matter, so-called signature, is transported on a paper discharge belt 10, and is discharged onto a paper discharge conveyor 12 by an impeller 11, and is accumulated outside the machine.

Furthermore, when 1/2 of this size is required, it is folded from the center by a chopper 13 provided in the middle of the paper ejection belt 10, and an impeller 14 moves the paper ejection conveyor 1.
5 is discharged on top.

In the folding machine 2 configured as described above, the signatures folded by the folding cylinder T are transported on the paper discharge belt 10 and sent to the impeller 11.
While the paper is being discharged onto the paper discharge conveyor 12, the conveyance may be stagnant for some reason and a so-called paper jam may occur.

If this paper jam is left unattended even for a short period of time, the web 1 may get caught up in the cylinders 7, 8, and 9, or the signatures may get caught in the impeller 1.
1 and other rotating bodies, wasting a large amount of paper, and in extreme cases can even damage the machine.

Further, the subsequent restoration work is time-consuming, and may not be completed in time for emergencies such as newspaper printing, which may result in fatal damage.

Therefore, in order to minimize such damage, a paper jam detector is installed in the signature transport path, and the signal emitted by the paper jam detector is used to stop the machine. Therefore, if the machine is suddenly stopped, the rotation transmitting part etc. will be damaged, so to protect the machine, it is necessary to make it rotate several times before stopping.

Therefore, various devices have been proposed to treat the web 1 fed into the folding machine during this time.

For example, in the method proposed by Japanese Utility Model Publication No. 52-135202, a pair of cutters are provided directly below the former, facing each other with the web sandwiched between them, and the cutters are displaced in response to a paper jam signal to cut the web.

In addition, the method proposed by JP-A-52-123706 has a cutter directly below the former, and rollers that rotate in synchronization with the running speed of the web on both the front and back sides of the former, and the cutter is displaced by a paper jam signal. At the same time, the rollers on both sides of the former are pressed against each other to discharge the web from the machine.

However, all of these proposals require special space to provide a special cutter for cutting the web and its auxiliary equipment, and are extremely dangerous.

Furthermore, since the web is cut at an arbitrary position, small pieces remain in the folding machine, making it difficult to resume operation.

The present invention has been made in view of the above points, and includes a winding device consisting of two bars supported by sandwiching the web and a holding member thereof, which is provided between a nipping roller and a cutting cylinder. By rotating the paper jam detector in response to a signal generated when it detects a jam in a signature, the web is cut by the cutters of the cutting cylinder, and the web is wound up by the winding device. The present invention provides a web entanglement prevention device in a folding machine of a rotary printing press, which prevents wastage and damage to the machine, speeds up recovery work, and makes work safer.

Hereinafter, its configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

2 to 8 show the entrapment prevention device according to the present invention, FIG. 2 is a front view of the main part of a folding machine implementing this, FIG. 3 is a perspective view, and FIG. 4 is a cutting device. , FIG. 5 is a detailed view of the paper jam detector, FIG. 6 is a detailed view of the rotation drive unit of the winding device, FIG. 7 is a perspective view of the winding device, and FIG. 8 is a diagram explaining the operation. It is.

In these figures, the same reference numerals as those in FIG. 1 indicate the same configurations, so the above explanation will be omitted and only a supplementary explanation will be provided.

In the figure, the nipping roller 6 below the lead roller 5
A rubber roller 23 rotatably provided at the tip of an arm 22 that is pivotally attached to an arm support shaft 21 is attached via the web 1, and this rubber roller 23 is attached to the operating lever 24.
The web 1 is moved forward and backward by operating .

The details of the cutting device 25 provided on the folding drum 7 and cutting drum 8 will be explained with reference to FIG. A pair of presser plates 27 biased toward the barrel 7 side are provided so as to be movable forward and backward while sandwiching a saw blade 29 fixed to a saw blade stand 28.

On the other hand, the folding drum 7 includes a saw blade holder 30 made of rubber, and a needle provided at the tip of a swingable needle lever 31 that advances and retreats in the needle hole of the saw blade holder 30 by swinging. 32 are provided.

Then, the presser plate 27 is rotated 7,81 times or 1/2 times.
Since the and the saw blade holder 30 face each other, the holding plate 27 is pressed by the saw blade holder 30 and retreats leaving the saw blade 29 behind, and the needle 32 is moved to the saw blade by swinging the needle arm 31 by a cam (not shown). Since the web 1 protrudes from the receiver 30, the web 1 is cut by the needle 32 and the saw blade 29 crimped onto the saw blade receiver 30, and after being cut, the web 1 is conveyed by the needle 32.

Furthermore, a paper jam detector 33 is provided above the mouth cylinder 9, the details of which are shown in FIG. A holding plate 34 for holding a folded signature is attached to a notch provided on the outer periphery of the holding cylinder 9 . It is supplied onto a guide plate 35 provided opposite to the upper peripheral edge of the.

A microswitch 36 is provided above and close to the upper and lower conveyor belts 10 that pinch and convey signatures, so that the upper conveyor belt 10 is displaced upward when a signature gets stuck in the conveyance path. Sometimes, this is sensed by the actuator 37 and a signal is issued to stop the machine and at the same time actuate an electromagnetic clutch, which will be described later.

At an intermediate portion between the nipping roller 6 and the cutting cylinder 8, there is a winding consisting of a winding bar 38 which clamps the web 1 and is supported on both sides thereof, and a semicircular holding plate member 39 which holds both ends of the winding bar 38. A loading device 40 is rotatably provided.

FIG. 6 is a longitudinal cross-sectional view showing details of the rotational drive section of the winding device 40. One end shaft 41 of the winding device 40 is rotatably supported by a machine side plate 42 and a bracket 43. A gear 45 is rotatably mounted on the end shaft 41 and rotated via a gear 44 by a drive device of a machine base (not shown).

Furthermore, an electromagnetic clutch 49 is mounted on the end shaft 41 and is made up of a field 46, a rotor 47, and an armature 48, and is activated by a signal generated by the paper jamming device 33 to transmit the rotation of the gear 45 to the end shaft 41. .

The electromagnetic clutch 49 is de-energized at the same time as the machine is stopped.

The operation of the winding device 40 of the folding machine 2 configured as above will be explained.

During normal operation of the folding machine 2, the winding device 40 is placed in a balanced state with the two winding bars 38 horizontal, as shown in FIG. 8a.

When a signature is jammed in the conveyance path and the paper jam device 33 detects this and issues a signal, the electric bite clutch 49 is activated.
The rotation of the gear 45, which is constantly rotating, is transmitted to the winding device 40, causing it to rotate in the clockwise direction as shown in FIG.

Accordingly, the web 1 passes through the state shown in FIG. 8b and is wound up by the winding bar 38 as shown in FIGS. 8c and 7.

As a result of this winding, the edge of the paper held by the needle 32 of the web 1 is pulled, and the needle hole becomes a particularly elongated hole, indicated by reference numeral 50 in FIG. 7, and comes off the needle 32, and the web 1 is wound up.

In this case, the winding bar 38 collides with the web 1 in an accelerated state as shown in FIG.
However, if the wrapping angle of the web 1 around the folding drum 7 is too large and the web 1 cannot be removed from the needle 32, the electromagnetic clutch 49 will slip and the winding device 40 will The web 1 waits in the state shown in Fig. 8b and runs for one pattern.

Then, at the next cutting position, the lower web 1 is wound up, and at the same time, the web 1 fed in from above is also wound up.

The machine base rotates several times due to inertia and then stops, and at the same time, the electromagnetic clutch 49 is de-energized, so that the winding device 40 is rotatable and the web 1 can be easily rewound.

FIG. 9 is a diagram for explaining the operation of a winding device according to another embodiment of the present invention according to FIG. 8, and in this embodiment, the holding member 39 of the winding device 40 is shown in FIG. The winding bar 38 is vertically longer than that of the web 1, and the winding bar 38 is close to the web 1 in the stationary state shown in FIG.

By doing this, the time from when the winding device 40 starts rotating until the winding bar 38 comes into contact with the web 1 as shown in b is shorter than that shown in FIG. 8, so the response is faster. , the amount of web 1 carried into the folding machine is reduced accordingly, and paper wastage is reduced.

FIG. 10 shows an example in which the present invention is applied to a folding machine that prints a double-width web and takes it out in two rows using one turn bar or an irregularly shaped turn bar.
The winding bar 38 is held by a holding member 39 not only at both ends but also at its center.

This eliminates twisting of the winding device 40 and improves the transmission of rotational moment.

In each of the above embodiments, the winding device 40 is driven by the same drive source as that of the machine base, and is connected and disconnected by the electromagnetic clutch 49. It may also be driven by a source.

As is clear from the above description, according to the present invention, in a folding machine of a rotary printing press, a winding device consisting of two bars supported by sandwiching the web and a holding member thereof is separated from a nipping roller. A paper jam detector installed between the web and the paper cylinder detects a jam in the signature during conveyance and generates a signal to rotate the web, and the paper edge of the web is cut by the cutter of the cutting cylinder. With this configuration, the web is always cut at a fixed size position, so no small pieces of web remain in the folding machine, and the web is wound very quickly and is easy to unwind after the machine is stopped. This reduces wasted paper due to paper jams, prevents damage to the machine, facilitates recovery work, improves efficiency, and allows for emergency response.

In addition, the web can also be used with the existing cutter installed on the cutting body.
Since there is no need to provide a special cutter, adjustment work etc. is extremely safe.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an outline of a conventional folding machine of a rotary printing press, FIGS. A front view of the main parts of the folding machine that implemented this, Figure 3 is also a needle view, Figure 4 is a detailed diagram of the cutting device, Figure 5 is a detailed diagram of the paper jam detector, and Figure 6 is a detailed diagram of the paper jam detector. 7 is a perspective view of the winding device; FIG. 8 is an explanatory diagram of the operation; FIG. 9 is an explanatory diagram of the operation of the winding device according to another embodiment; FIG. The figure is a perspective view showing an example in which the present invention is implemented in a folding machine with two rows. 1... Web, 2... Folding machine, 6...
... Knitting roller, 8 ... Cutting cylinder, 33
... Paper jam detector, 38 ... Roll-up bar, 39 ... Holding member, 40 ... Roll-up prevention device.

Claims (1)

[Claims] 1 Consists of a take-up bar that holds the running web and supports it on both sides, and a holding member that holds both ends of the take-up bar, which rotates in response to a signal from a paper jam detector in the paper discharge section to remove the web. 1. A web entrainment prevention device in a folding machine of a rotary printing press, characterized in that a winding device for winding up web is provided between a nipping roller and a cutting cylinder.