JP2537851Y2 - Threading device of web press - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper threading device for a web-fed rotary printing press.

[0002]

2. Description of the Related Art In a newspaper rotary press and the like, an automatic paper threading device is provided in order to speed up the threading operation and to save labor when switching work or when cutting paper during operation. Generally, this paper threading device is provided with a rotating body such as a belt for paper threading from a paper feeding section to a folding section along a paper path, and the rotating body is driven by a motor or the like to pull the leading end of the web. It is guided to a rotating body via a member or the like.

[0003] A rotary press having a plurality of paper paths has a plurality of rotating bodies, and a number of methods of transferring a traction member or the like between the rotating bodies have been proposed. For example, as disclosed in Japanese Utility Model Unexamined Publication No. 63-201727, a holder is fixed to a rotating body, while a traction member (paper joint) is provided with a hole for engaging with the holder. As disclosed in JP-A-61-76368, a device provided with a grip change mechanism for moving a pair of guides and rolls toward and away from each other to transfer a traction member (connecting member) between elongated holes of both rotating bodies (belts). There is.

[0004]

However, in the case of the former, the holding of the traction member is uncertain, and particularly in the delivery operation, the traction member is not completely held by the downstream holder and the upstream side is not held. There is a possibility that the sheet may move off the holder and start moving, and fall off in the middle of the paper path. this is,
Not only the threading operation is interrupted, but also the machine may be damaged depending on the position where the sheet is dropped off. Further, in the case of the latter, a control device is required for approaching the pair of guides and rolls in the gripping mechanism and the long holes of both rotating bodies at the same phase and at the same speed, which is expensive.

Accordingly, an object of the present invention is to provide a low-cost paper threading device in which the holding of the traction member is ensured even during the delivery operation.

[0006]

In order to achieve the above object, the present invention provides a paper threading device for a web-fed rotary printing press having a plurality of rotating bodies laid along a paper path.
While each of the holders is fixed to the rotating body, the holder has two engagement portions that can be detachably engaged with the holder located on the upstream side of the paper path and the holder located on the downstream side, respectively. A traction member having a built-in reversal holding mechanism capable of automatically resiliently reversing the holder from the upstream side to the holder on the downstream side at the time of delivery and holding the holder on the downstream side is provided.

[0007]

According to the above construction, the downstream holder and the engaging portion of the traction member are engaged, and after the downstream holder is held by the reversing holding mechanism, the engagement portion of the upstream holder and the traction member is disengaged. It becomes possible and a good delivery operation is performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 4, the two chains 1A and 1B are wrapped up and down at the delivery point B along the paper path where the threading start point A, the transfer point B, and the paper end point C are respectively set. , Each laid.

The two chains 1A and 1B are individually driven by motors 2A and 2B, respectively, and holders 3A and 3B for engaging with the traction member 5 for web traction are fixed at one position. Reference numeral 4 in FIG. 4 denotes a limit switch that is provided near the delivery point B and that issues a stop signal to the upstream motor 2A when the upstream holder 3A reaches the delivery point B.

As shown in FIGS. 1 and 2, the holders 3A and 3B are formed in an I-shaped cross section, have a constricted portion 6 in the left-right direction, and have an upstream chain 1A via an L-shaped bracket 7. Is attached upward and the chain 1B on the downstream side is attached downward.

The traction member 5 has a rectangular cylindrical case 8 whose front end face is closed. The constricted portions 6 of the holders 3A and 3B are provided on both upper and lower plate portions of the case 8 on the upstream side of the paper path. The slits 9A and 9B that can be engaged with the holes 9A and 9B are formed. The case 8 is assembled with a reversal holding mechanism 10 capable of selectively holding the holders 3A and 3B by elastic reversal.

As shown in FIGS. 3 and 5 , the reversing holding mechanism 10 includes a fulcrum pin 11 pivotally supported between the front portions of the left and right side plates of the case 8, and a left and right side of the case 8. and the pivoted a over arm 12 between the rear of the side plate portions, a roller 13 rotatably held by the arm 12, the suspended pair of right and left tension between the fulcrum pin 11 and the roller 13 Spring 1
4 so that the roller 13 is elastically inverted around the pivot point of the arm 12.

In this embodiment, the fulcrum pin 11
A hinge 15 is rotatably held by an extension part outside the case, and a flexible lead 1 appropriately fixed to the hinge 15.
The end of a web 17 is attached to 6 with an adhesive tape 18.

Next, the operation of the present invention will be described. First, at the paper threading start point a, the operator engages the lower slit 9A of the traction member 5 in a state where the roller 13 is flipped up with the holder 3A on the upstream side waiting at a predetermined position. By inverting, the traction member 5 is moved to the holder 3A.
To be held.

Next, after attaching the leading end of the web 17 to the lead 16 with an adhesive tape 18, pressing a paper threading start button on an operation panel (not shown) activates the motor 2A on the upstream side, whereby the traction member 5 Move to the delivery point b and stop.

Next, the motor 2B on the downstream side is activated, whereby the downstream holder 3B, which has been waiting near the delivery point B, starts to move, and the upper slit of the traction member 5 at the delivery point B is moved. 9B.

When the downstream holder 3B moves further,
The traction member 5 is moved upstream by the thrust of the holder 3B on the downstream side.
It moves to the right side of FIG. 1 with respect to the side holder 3A. to this
As mentioned earlier, the
The rear part of the holder 3A on the flow side is held by the spring force of the tension spring 14.
The arm 12 supporting the roller 13 held by the
The rear of the holder 3A resists the spring force of the tension spring 14
1 and the center of the roller 13 is a fulcrum pin.
An extension of a straight line connecting the pivot point 11 and the pivot point of the arm 12
Beyond the above idea, the arm 12 will be
4B rotates clockwise by the spring force of FIG.
B 13 is the downstream portion already engaged with the upper slit 9B.
To the position where the rear part of the side holder 3B is held, and
The operation is completed.

Thereafter, the traction member 5 may be
The above-described delivery operation is performed a plurality of times, and then the paper passing end point c is reached and stopped.

At the end of the threading, the operator first disconnects the lead 16 from the tip of the web 17 and then grasps the case 8 of the towing member 5 and pulls it forward , whereby the roller 13 is turned over again and towed. The member is separated from the holder 3B on the downstream side.

Thereafter, the operator presses the paper threading end button. As a result, the motors 2A and 2B are started, and the holders 3A and 3B are stopped after returning to the predetermined positions, thereby completing a series of paper threading operations.

The present invention is not limited to the above embodiment,
A rotating body such as a belt may be used instead of the chain,
It is needless to say that the present invention can be applied to the arrangement of two chains and the like, for example, when the downstream chain 1B in the illustrated example is arranged at right angles to the upstream chain 1A.

[0022]

As described above, according to the present invention, a paper threading device capable of reliably holding a traction member for web traction even during its delivery operation can be realized without using complicated or expensive mechanisms and devices. The effect of being realized is obtained.

[Brief description of the drawings]

FIG. 1 is a side view of an essential part showing one embodiment of the present invention.

FIG. 2 is a front view of an essential part showing one embodiment of the present invention.

FIG. 3 is a plan view of an essential part showing one embodiment of the present invention.

FIG. 4 is an overall side view showing an embodiment of the present invention.

FIG. 5 is an enlarged view of a main part of FIG. 3 showing one embodiment of the present invention.

[Explanation of symbols]

 1A, 1B Chain 3A, 3B Holder 5 Traction Member 8 Case 9A, 9B Slit 10 Reverse Holding Mechanism 14 Tension Spring 16 Lead 17 Web

Claims (1)

(57) [Scope of request for utility model registration] 1. A paper threading device for a web-fed rotary printing press provided with a plurality of rotating bodies laid along a paper path, wherein a holder is fixed to each of the rotating bodies while being positioned upstream of the paper path. holder and the elastic inverted from the holder side of the upstream side during the transfer between the holder and having two engagement portions which can engage each removably engaged into a holder located on the downstream side to the holder side of the downstream And a traction member having a built-in reversal holding mechanism capable of holding a holder on the downstream side.