JP2769999B2 - Theta reduction gear for rotary printing 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 speed reducer for a rotary printing press theta, and more particularly to a path for transporting a cut sheet obtained by cutting a printing web fed from a rotary printing press into a predetermined length to a stack section. And a speed reduction device provided with a reduction roll provided to reduce the speed of the cut paper conveyed at high speed to a speed suitable for supply and lamination.

[0002]

2. Description of the Related Art The final stage of a web offset printing press includes:
In some cases, a sheeter device is provided which cuts a print web fed from a printing press unit into a predetermined length to form a sheet-by-sheet state, and sequentially stacks the sheets. This theta device applies a tension to the cutting section that cuts the print web conveyed at a high speed at the printing speed, so that the cut length at this cutting section does not vary, and also overlaps the paper at the subsequent low-speed section. A high-speed transport unit that transports at a high speed slightly higher than the printing speed to take timing, etc., and a low-speed transport that reduces the transport speed to a speed that does not affect lamination for lamination to the final stack unit Section.

In this type of theta, a speed reducer is used to transfer a cut sheet from a high-speed transport unit to a low-speed transport unit. Conventionally, the leading end of the cut sheet discharged from the high-speed transport unit is sent to the low-speed transport unit. Generally, a method is adopted in which a cut sheet that is received by a contacting decelerating roll (squaring roll), temporarily stopped on the low-speed transport unit, aligns the cut sheets conveyed in a bent state, and is then transported by the low-speed transport unit. ing. In a reduction gear provided with such a reduction roll, the roll contact pressure to the low-speed transport unit is important. If the contact pressure is increased, the leading end of the cut sheet is damaged, and if the contact pressure is reduced, the reduction function is lost. Further, depending on the thickness of the cut sheet and the printing state, it is necessary to adjust the contact pressure or to make the contactless state. For this reason, a contact pressure adjusting mechanism is provided.
Japanese Patent Application Laid-Open No. 6-26139 proposes a technique for adjusting the contact pressure of a reduction roll with an adjusting screw.

[0004]

However, in a conventional apparatus using a speed reduction roll, the contact pressure is adjusted by adjusting the amount of tightening by an adjustment screw, or the gap between the roll and the transport unit is adjusted. Therefore, there is a problem that it is difficult to adjust while grasping the adjustment pressure, and it is difficult to arbitrarily set the adjustment amount. Further, when it is necessary to bring the deceleration roll corresponding to a certain area of the paper surface into a non-contact state depending on the printing condition of the cut sheet, it is necessary to lift the roll to a floating position where the roll is completely separated from the transport unit. The rotating operation of the adjusting screw must be continued by the predetermined amount, and there is a contradictory problem that the screw connection structure is disadvantageous for the separating operation.

The present invention focuses on the above-mentioned conventional problems, and it is possible to arbitrarily and easily adjust the deceleration roll while grasping the contact pressure, and one-touch operation when the roll is lifted to a floating position. It is an object of the present invention to provide a speed reducer for a theta for a rotary printing press, which can be performed by using a speed reducer.

[0006]

In order to achieve the above object, a speed reducer for a rotary printing press sheeter according to the present invention has a speed reduction roll attached to a swing arm that is supported by a frame. A speed reduction device in which a reduction roll is brought into rolling contact with a transport belt to receive cut sheets at a rolling engagement portion, wherein a mechanism for adjusting a rolling contact pressure of the reduction roll is provided between a frame side and a swing arm. The present invention comprises a spring extension mechanism provided, an adjustment portion for a spring urging force provided, and a lifting and holding mechanism for holding the deceleration roll at a position floating above the conveying surface against the spring urging force.

[0007] In this case, the spring biasing force adjusting section can adjust the spring pressing force in a stepwise manner by a notched rotary knob screwed to the fixed base. Also,
The lifting mechanism includes an engaging portion provided on the swing arm, and a locking portion attached to a fixed base and moved to a locking position on the engaging portion in conjunction with the lifting operation of the swing arm. What is necessary is just to comprise, and the roll floating position holding | maintenance is enabled by the locking of an engaging part.

More specifically, a speed reducer for a rotary printing press sheeter has a speed reduction roll attached to a swing arm which is supported by a frame. And a mechanism for adjusting the rolling contact pressure of the reduction roll is connected between the frame-side fixed base and the swing arm by a spring expansion and contraction mechanism. The mounting portion to the fixed base is provided with a lifting holding mechanism that allows the spring pressing force to be adjusted stepwise by a notched rotary knob, and that holds the deceleration roll at a position floating from the conveyance surface against the spring biasing force. And an engaging portion provided on the swinging arm, which is attached to a fixed base and moved to a position where the engaging portion is locked to the engaging portion in conjunction with a lifting operation of the swinging arm. It is constituted by a latchable and the locking portion.

[0009]

According to the above construction, the swing arm is pressurized by the bias of the spring and the deceleration roll can be rolled at a predetermined pressure, and the bias of the spring can be adjusted, so that a very light contact pressure can be easily set. can do. When contact avoidance is required due to the printing condition of the cut sheet, the roll is held at the lifting position by simply lifting the roll side because of the holding mechanism, and the non-contact state can be easily set. Can be. In other words, the roll can be easily held at the floating position by utilizing the bending of the spring while allowing the spring to easily set the lightly lowered state. This makes it possible to easily stop the deceleration roll from rolling on the paper surface depending on the printing condition and to prevent the occurrence of printing stains. By adjusting the biasing force of the spring expansion and contraction mechanism so that the amount of tightening of the spring can be adjusted by a notched rotary knob, it is possible to easily adjust the contact pressure, for example, in units of 100 g, and to adjust to the operating condition of the theta. The adjustment can be easily performed, and the adjustment corresponding to the thickness of the cut sheet or the like is extremely simple.

Further, the lifting mechanism is provided with a locking portion which moves to a locking position on the engaging portion provided on the arm in conjunction with the lifting operation of the roll and the swinging arm when the lifting operation is performed. The roll can be engaged and held at the floating position simply by the lifting operation. Therefore, when trying to prevent the roll from coming into contact with the printing surface of the cut sheet, it is simply performed by a lifting operation on the roll side, and when this is released, the original set pressure is restored, and again. Adjustment work is not required.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of a speed reducer for a theta for a rotary printing press according to the present invention will be described in detail with reference to the drawings. First, FIG. 4 is a schematic configuration diagram of a rotary printing press theta. The theta 10 includes a cutting unit 14, a high-speed transport unit 16, a low-speed transport unit 18, and a stack unit 20 along the flow direction of the print web 12 sent from a print unit (not shown). The printing web 12 from the printing unit is introduced into the cut section 14 via a plurality of guide rolls 22. At the entrance of the cut section 14, a draw roll 24 and a press roll 26 which is in contact with the draw roll 24 are provided. I have. The draw roll 24 is driven to rotate synchronously with the printing cylinder of the printing unit, and conveys and supplies the web 12 to the cutting unit 14 at a speed slightly higher than the printing speed. A compensator roll 28 is provided immediately before the draw roll 24, and
4 to adjust the cutting position.

The printing web 12 fed from the draw roll 24 is introduced into the cutting section 14, which is constituted by a flying knife 30 rolled on the upper surface of the printing web 12 and a fixed knife disposed on the lower surface. Have been. The flying knife 30 is provided with knives at one or two places on the outer periphery of the knife body, and is provided with a printing web 12.
The print web 12 is cut to a predetermined length by a peripheral speed higher than the transport speed of the print web 12. As a result, the cut sheet is discharged from the cut section 14.

A high-speed transport section 16 and a low-speed transport section 18 are continuously arranged from the exit of the cut section 14 along the paper flow direction. It comprises a high-speed tape 32 and a lower low-speed tape 34. An upper pressing tape 36 is provided on the upper surface of the cut sheet fed by the high-speed and low-speed tapes 32 and 34.

The lower high-speed tape 32 is composed of a pair of rolls 32.
A transport tape 32T is wound around A, 32B, and the transport speed of the transport tape 32T is set as a drive roll using the roll 32B on the exit side (the transport speed of the print web 12).
The paper is driven to rotate at a higher speed at a higher speed so that the cut sheets discharged from the cutting unit 14 have a gap therebetween. Similarly, the lower low-speed tape 34 is configured by winding a transport tape 34T between a pair of rolls 33A and 34B, and feeding the transport tape 34T to the stack unit 20 with the transport tape 34T as a drive roll. Is driven at a low speed to the extent possible. Upper holding tape 36 disposed on the upper surface of lower high-speed tape 32 and lower low-speed tape 34
Face each other so that a paper conveyance gap is formed between the high-speed tape 32 and the low-speed tape 34, and
The upper surface of the cut paper conveyed above is pressed, and is driven to rotate at a conveying speed that matches the conveying speed of the high-speed tape 32.

The cut paper is made of the tapes 32, 34, 36 described above.
In order to shift from the high-speed state to the low-speed state, the speed reducer 40 according to the embodiment is provided on the upper pressing tape 36 side in the portion facing the low-speed transport tape 34. The details are shown in FIGS. 1 is a partial sectional side view, FIG. 2 is a plan view and a transverse sectional view, and FIG. 3 is a plan view of the entire arrangement. As shown in these figures, the hinge shaft 44 is passed over the left and right shaft receivers 41 so as to cross over the upper surface of the low-speed transport tape 34.
Is installed. The shaft receiver 41 is the belt arm 4
3 and the whole including the hinge shaft 44 can be adjusted in the front-rear position by the shaft receiver 41. At a predetermined interval on the hinge shaft 44,
A plurality of deceleration rolls 46 are attached to and detachable from the low-speed transport tape 34 (see FIG. 3). The deceleration roll 46 receives the leading end of the cut paper conveyed at a high speed in a gap between the low speed transport tape 34 and the cut paper, and transfers the cut paper to the low speed transport tape 34 to reduce the speed. It is configured to be rolled on the surface of the substrate 34 with a light contact pressure.

In order to move the speed reduction roll 46 toward and away from the tape, the speed reduction roll 46 is connected to the hinge shaft 44.
Is attached to the tip of a swing arm 50 which is rotatably mounted via a bush 48 to the arm. Swing arm 5
Numeral 0 designates a configuration in which two arm flat plates are opposed to each other. A fixed shaft 52 is attached to the distal end, and a reduction roll 46 is attached to the fixed shaft 52. A stand block 54 as a fixed base is fixedly provided on the hinge shaft 44 between the arm flat plates. A horizontal plate 56 is attached to an upper portion of the stand block 54. A spring expansion / contraction mechanism 58 is disposed between the horizontal plate 56 and the swing arm 50 to reduce the pressure at which the speed reduction roll 46 comes into contact with the tape. Adjustable.

The spring extension and contraction mechanism 58 includes a rotation knob 60 screwed to the horizontal plate 56 and the rotation knob 6.
And a connecting rod 64 which telescopically fits through a spring 62 to the connecting arm 64.
It is configured to be pivotally connected to zero. That is, the rotation knob 60
A spring housing hole 66 is bored from the lower end surface side to house the spring 62, and the connecting rod 64 is inserted from the opening of the housing hole 66. Connecting rod 64
A seating plate 68 is formed at the insertion portion of the shaft so as to receive the spring 62, and the connecting rod 64 presses the deceleration roll 46 in the tape rolling direction by the spring pressing force.

Since the rotary knob 60 is screwed to the horizontal plate 56, the rotary knob 60 functions as a pressing force adjusting portion. However, the spring pressing force can be adjusted stepwise so that the adjusting force can be grasped. For this reason, a notch 70 is formed on the outer peripheral surface of the rotary knob 60, while a spring plunger is disposed on the stand block 54 in the radial direction of the rotary knob 60 so that a projection can be engaged with the notch 70. 72, and the rotary knob 6
0 can be rotated intermittently. And
An adjusting force is applied to the upper end surface of the rotary knob 60, for example, 1 to indicate the adjusting force of the spring pressing force corresponding to each notch position.
The scale is attached so as to be in units of 00 g (not shown).

With the above configuration, the pressing force against the tape can be adjusted by the spring adjusting mechanism 58 so that the speed reducing roll 46 can be brought into an optimum rolling contact state. The tape can be held at a position floating above the tape. For this reason, the speed reduction roll 46 sandwiches the stand block 54 therebetween.
A stay shaft 74 extends between the flat plate arms at the end of the swing arm 50 on the side opposite to the mounting side. On the other hand, a support 76 is rotatably suspended at an end of the horizontal plate 56 located above the stay shaft 74. V-shaped notch 78 at the lower end of support 76
When the notch 78 is engaged with the stay shaft 74, the speed reduction roll 46 is in a raised state and is held at a position separated from the tape. In order to facilitate this lifting and holding, the support 76 is positioned below the support position and the stand block 54.
1 is rotationally urged in the counterclockwise direction in FIG. 1 and is normally always connected to the side surface of the stay shaft 74. When the reduction roll 46 is lifted, the stay shaft 74
Is turned so as to get over V
The stay shaft 74 is engaged with the notch 78, and the swing arm 50 is held at this position. Further, a stopper 82 is provided on the stand block 54 so that the support 76 is not unnecessarily rotated. The stopper 82 is for fixing the stand block 54 to the hinge shaft 44, and also serves as a stopper for the support 76.

In the drawing, reference numeral 84 denotes a belt press roller, which is held by the side arm 42 attached to the hinge shaft 44 and is disposed so as to be parallel to the hinge shaft 44, and the running level of the upper press tape 36. Has been adjusted. In addition, the snapper roll 86 that presses the trailing edge of the cut sheet stopped by the speed reduction device is a low-speed tape 34.
(See FIG. 4), the rear end of the cut paper conveyed at a high speed is pressed down one by one, and the delivery to the low-speed tape 34 is smoothly performed together with the speed reduction device.

In the speed reducer for a rotary printing press sheeter constructed as described above, the speed reduction roll 46 is rolled in contact with the low speed tape 34 by the swing arm 50 and is rotated while being driven to rotate. Immediately after the rear end of the cut sheet sent is pressed by the snapper roll 86, the leading end of the cut sheet is received by the gap between the reduction rolls 46 and decelerated. The contact pressure of the deceleration roll 46 is set by its own weight on the roll side and the pressing force of the spring 62, but needs to be changed depending on the paper quality and printing state.
In this case, the pressing force of the spring 62 can be adjusted by rotating the notched rotary knob 60, and the pressing can be performed stepwise by engaging the notch 70 with the spring plunger 72. Since the scale is provided so that the interval between the notches 70 is a unit for adjusting the pressing force, it is possible to directly adjust the pressing force while visually confirming it.

Depending on the printing condition, it may be necessary to partially separate the reduction roll 46 from the cut sheet. In this case, simply raising the reduction roll 46 or the swing arm 50 causes the stay shaft 74 at the rear end of the arm to move. It is automatically engaged with the support 76 so that the reduction roll 46 can be held at the floating position. Since this operation can be performed with one touch, the responsiveness is excellent.
Then, when shifting from the floating holding to the normal rolling contact state, it is easily performed by removing the support 76, and the contact pressure of the returned deceleration roll 46 becomes the initially set pressing force. Work becomes unnecessary.

In the above embodiment, the reduction roll 4
6 is held by pressing the rear end portion of the swing arm 50 from above.
It is also possible to realize by lifting the side arm portion so as to engage with the hook.

[0024]

As described above, according to the present invention,
The mechanism for adjusting the rolling contact pressure of the reduction roll is constituted by a spring expansion and contraction mechanism provided between the frame side and the swing arm, and a spring urging force adjusting unit is provided, and the deceleration roll resists the spring urging force. By providing a lifting and holding mechanism that holds the paper at the position where it has floated from the transport surface, it is possible to easily adjust the contact pressure to adjust the speed reduction roll, and it is possible to lift and hold the roll to the floating position, thereby improving paper quality. And the effect that the adjustment work according to the printing situation can be performed very easily. Further, by configuring the spring urging force adjustment unit so that the spring pressing force is adjusted in a stepwise manner by a notched rotary knob screwed to the fixed base, it is possible to prevent the adjustment force from varying. Further, a lifting mechanism is provided by an engaging portion provided on the swing arm and a locking portion attached to the fixed base and moved to a locking position on the engaging portion in conjunction with the lifting operation of the swing arm. With this configuration, the lifting operation can be performed with one touch, and when the lifting is released, the originally set pressing force is maintained, so that there is an effect that the resetting is not required.

[Brief description of the drawings]

FIG. 1 is a side view of a reduction gear transmission according to an embodiment.

FIG. 2 is a partial cross-sectional plan view of the device of the embodiment.

FIG. 3 is an overall plan view of the apparatus of the embodiment.

FIG. 4 is a side view showing the overall configuration of the theta.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 sheeter 12 printing web 14 cut section 16 high-speed transport section 18 low-speed transport section 20 stack section 22 guide roll 24 draw roll 26 press roll 28 compensator roll 30 flying knife 32 lower high-speed tape 34 lower low-speed tape 36 upper press tape 40 speed reducer 42 Side frame 44 Hinge shaft 46 Deceleration roll 48 Bush 50 Swing arm 52 Fixed shaft 54 Stand block 56 Horizontal plate 58 Spring expansion / contraction mechanism 60 Rotary knob 62 Spring 64 Connecting rod 66 Spring storage hole 68 Seat plate 70 Notch 72 Spring plunger 74 Stay shaft 76 Support 78 V-shaped notch 80 Towing spring 82 Stopper 84 Belt press roller

Claims (4)

(57) [Claims] A speed reduction device mounted on a swing arm pivotally supported by a frame and having a speed reduction roll, wherein the speed reduction roll is rolled in contact with a transport belt to receive cut sheets at a rolling engagement portion. The mechanism for adjusting the rolling contact pressure of the reduction roll is constituted by a spring expansion and contraction mechanism provided between a frame side and a swing arm, and a spring biasing force adjustment unit is provided. A speed reducer for a rotary printing press sheeter, wherein a lifting and holding mechanism is provided for holding at a position floating above a conveying surface against a force. 2. The spring urging force adjusting section is capable of adjusting a spring pressing force in a stepwise manner by a notched rotary knob screwed to a fixed base.
4. The speed reducer for a theta for a rotary printing press according to claim 1. 3. The lifting mechanism, wherein the lifting mechanism is mounted on a swing arm and is attached to a fixed base, and moves to a position where the lifting mechanism is locked to the engagement section in conjunction with a lifting operation of the swing arm. 2. The speed reducer for a rotary printing press according to claim 1, further comprising a locking portion, the roll floating position being maintained by locking the engaging portion. 4. A speed reducer mounted on a swing arm pivotally supported by a frame and having a speed reduction roll, wherein the speed reduction roll is brought into rolling contact with a transport belt so as to receive a cut sheet at a rolling engagement portion. The mechanism for adjusting the rolling contact pressure of the deceleration roll is constituted by a spring expansion and contraction mechanism that connects the frame-side fixed base and the swing arm. An engaging portion provided with a lifting / holding mechanism which makes it possible to adjust the spring pressing force by a knob in a stepwise manner and holds the deceleration roll at a position floating above the conveying surface against the spring urging force, and which is provided on the swing arm And a locking portion attached to a fixed base and moved to a locking position with respect to the engaging portion in interlock with the lifting operation of the swing arm so as to be lockable. Characteristic reduction device for theta for rotary printing press.