JP2806498B2 - 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 is used to cut the print web conveyed at high speed at the printing speed via a draw roll so that the cut length does not vary, and to set the timing when the paper is overlapped at the subsequent low speed part. It has a high-speed transport unit that transports high-speed at a speed slightly higher than the printing speed for such a purpose, and a low-speed transport unit that reduces the transport speed to a speed that does not affect lamination for lamination to the final stack unit. I have.

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. For this reason, a contact pressure adjusting mechanism is provided.
Japanese Patent Publication No. 36 proposes a technique for adjusting the contact pressure of a reduction roll with an adjusting screw.

[0004]

However, in the apparatus using the conventional reduction roll described in the above-mentioned publication, the contact pressure can be adjusted or the gap between the roll and the conveyance section can be adjusted by adjusting the amount of tightening by the adjustment screw. Adjustments are made. In addition, since there is no escape in the thickness direction of the paper in the set state, once the paper jam occurs, the paper conveyance must be stopped. When operating in the roll lifting direction for release,
It is extremely difficult to set again. Therefore, there is a problem that it is difficult to adjust the contact pressure of the speed reduction roll, it is difficult to adjust the adjustment range arbitrarily, and it is difficult to arbitrarily set the adjustment amount.

The present invention focuses on the above-mentioned conventional problems, and makes it easy to adjust the contact pressure of the reduction roll.
It is an object of the present invention to provide a speed reducer for a theta for a rotary printing press, which can have a wide adjustment range.

[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 mounted on a swing arm that is supported by a hinge shaft. A speed reduction device that rolls the deceleration roll on a transport belt and receives the cut sheet at a rolling engagement portion, wherein a rotating frame is attached to one of the fixed base attached to the hinge shaft and the swing arm. At the same time, a holder is provided with a rotary joint through which the rod is inserted, a spring is arranged on both sides of the rod with the holder interposed, and a biasing force adjusting nut of each spring is provided. By attaching to the rod, the rolling contact pressure of the reduction roll can be adjusted.

[0007] More specifically, a deceleration roll attached to a swing arm that is supported by a hinge shaft is provided. The deceleration roll is rolled in contact with the transport belt so that the cut sheet is received by the rolling engagement portion. In the reduction gear transmission, a rod is attached to the swing arm via a rotating pin, and a holder having a rotary joint for inserting the rod through a fixed base provided on the hinge shaft is provided. A spring is disposed on both sides of the rod so as to sandwich the same, and a nut for adjusting the biasing force of each spring is attached to the rod, whereby the rolling contact pressure of the reduction roll can be adjusted.

Further, there is provided a speed reduction roll attached to a swing arm which is pivotally supported by the hinge shaft, and the speed reduction roll is rolled in contact with the transport belt so as to receive the cut sheet at the rolling engagement portion. An apparatus, wherein a rod is attached to a fixed base provided on the hinge shaft via a rotating pin, and the swing arm is provided with a holder section having a rotary joint for inserting the rod, and the holder section is sandwiched. By arranging springs on both sides of the rod and attaching a biasing force adjusting nut of each spring to the rod, it is possible to obtain the cushion brake effect by enabling the adjustment of the rolling contact pressure of the reduction roll. Features.

Further, a double screw mechanism for holding the swinging arm at the decelerating roll rolling contact position is attached to the fixed gantry, and the decelerating roll can be floated and held by projecting a center screw.

[0010]

According to the above structure, for example, if a rod is attached to the swing arm and a holder having a rotary joint for inserting the rod through the fixed base is provided, the contact pressure of the reduction roll is adjusted. In this case, the distance between a pair of adjustment nuts constituting spring seats arranged on both sides of the holder portion into which the rod is inserted may be increased or decreased. By increasing the spring pressure by reducing the interval, the contact pressure increases, and conversely, by increasing the distance between the adjustment nuts, the spring pressure decreases, and the contact pressure can be reduced. The contact pressure can be adjusted by the resultant force of a pair of springs, so the adjustment range of shock absorption can be widened. In addition, since the holder is interposed on both sides, a force that rapidly raises the reduction roll acts. In this case, it is possible to easily return to the current state. That is, even when the paper thickness changes, the deceleration roll can easily escape, and a paper jam or the like can be easily dealt with by the cushion effect.

Further, when a double screw mechanism for holding the swinging arm at the decelerating roll rolling contact position is attached to the fixed base and the decelerating roll is floated and held by projecting the center screw, the normal rolling contact position is obtained. Can be held in position by the stopper action of the screw on the outer peripheral side, and when the deceleration roll is temporarily retracted, the center screw can be screwed forward to rotate the swing arm in the lifting direction. By resetting the center screw, it can be easily returned to the initial setting state.

[0012]

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. 5 shows a schematic configuration diagram of a theta for a rotary printing press. 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).
In this case, the paper is driven to rotate at a higher speed at a higher speed so that the cut sheets discharged from the cut unit 14 form a gap between each other. Similarly, lower low-speed tape 3
4 is a transport tape 34T between a pair of rolls 33A and 34B.
The transport tape 34T is stacked on the stack unit 20 using the exit side roll 34B as a drive roll.
The circulating drive is performed at such a low speed that cut paper can be fed into the hopper. The upper pressing tape 36 disposed on the upper surfaces of the lower high-speed tape 32 and the lower low-speed tape 34 faces each other so that a paper conveyance gap is formed between the high-speed tape 32 and the low-speed tape 34.
The presser presses the surface of the cut paper conveyed on the top 34, which is driven to rotate at a conveyance speed corresponding to the conveyance 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. Details are shown in FIGS. 1 is a sectional side view, and FIG. 2 is a plan view. As shown in these figures, a hinge shaft 44 which is located on the upper surface of the low-speed transport tape 34 and extends across the cut paper transport line is attached. The hinge shaft 44 can be adjusted in the front-rear position in the transport direction by a shaft receiving member (not shown). A plurality of speed reduction rolls 46 are attached to such a hinge shaft 44 at predetermined intervals, and each speed reduction roll 46 is attached to the low speed transport tape 34 so as to be able to approach and separate therefrom. 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 mounted via a fixed shaft 52 to the tip of a swing arm 50 which is rotatably mounted via a bush.
A stand block 54 as a fixed base is fixed to the hinge shaft 44 in parallel with the swing arm 50. A bracket 56 extending above the swing arm 50 is attached to an upper portion of the stand block 54, and a contact pressure adjusting mechanism 58 is disposed between the bracket 56 and the swing arm 50. The pressure at which the speed reduction roll 46 contacts the tape can be adjusted.

The contact pressure adjusting mechanism 58 includes the bracket 5
6, a holder portion 60 with a spherical joint provided at the tip end portion;
The holder portion 60 is constituted by a combination with a connecting rod 62 which is penetrated by the joint inner 60a and whose base end is pivotally connected to the swing arm 50 and is raised upward. Adjustment nuts 64 (64u, 64d) are screwed up and down on the connecting rod 62 with the holder portion 60 interposed therebetween.
A spring 66 (66u, 66d) is interposed between the spring 66a and a. The urging force of the spring 66 is changed by moving the vertical adjustment nut 64 forward and backward, and the upper adjustment nut 6
The connection rod 62 is lifted by screwing 4u in the spring compression direction, and the connection rod 62 is pulled down by similarly screwing the lower adjustment nut 64d in the spring compression direction. Thereby, the contact pressure of the reduction roll 46 with the tape can be adjusted.

With the above configuration, the pressure of the deceleration roll 46 against the tape can be adjusted by the spring adjusting mechanism 58, so that the roll contact state can be set to an optimum state.
At the same time, the speed reduction roll 46 can be held at a position floating above the tape depending on the paper quality and printing state. For this reason, the stand block 54 includes the reduction roll 4
A base 68 is fixed facing the end of the swing arm 50 opposite to the mounting side of the base 6, and is screwed therethrough to push down the rear end of the swing arm 50, thereby moving the reduction roll 46. A lifting mechanism 70 for lifting is provided.
This is achieved by reducing the rolls 46 around the hinge shaft 44.
Weight balance so that the side becomes heavier,
As shown in FIG. 7, the mechanism is configured to push down the rear end of the arm so as to rotate clockwise in the figure. For this reason, an initial balance adjustment is performed by having a main adjustment screw 72 screwed to the base 68 and an adjustment nut 74, and having the tip of the main adjustment screw 72 abut against the rear end surface of the arm. ing. A female screw is engraved at the center of the main adjustment screw 72, and a weight relief screw 76 screwed thereto is provided. The tip of the screw is projected independently from the abutting end of the main adjustment screw 72. I can do it. The weight releasing screw 76 is set to be maintained at the main adjusting screw 72 by an adjusting nut 78. Therefore, when the lifting operation is performed while the deceleration roll 46 is being moved, the weight release screw 76 can be rotated to temporarily hold the deceleration roll 46 at a position floating from the tape. And
To release this, the weight release screw 76 is retracted (upward in the figure) so that the screw tip is pulled in from the tip of the main adjustment screw 72. You will be in contact.

In the drawing, reference numeral 80 denotes a belt press roller, which is held by a side arm 82 attached to the hinge shaft 44 and is arranged 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 84 that presses the trailing edge of the cut sheet stopped by the speed reduction device is formed by the low-speed tape 34.
(See FIG. 5), the rear ends of the cut sheets conveyed at a high speed are pressed down one by one, and the transfer 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 is pressed by the snapper roll 84, the cut sheet is caught by the gap of the deceleration roll 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 by the pair of springs 66. The lifting resistance of the deceleration roll 46 is given by the urging force of the lower spring 66d, and the pushing resistance is given by the urging force of the upper spring 66u. In the embodiment, even when the deceleration roll 46 is suddenly lifted, since the vertical spring 66 sandwiches the holder portion 60, the state is returned to the steady state early, and the lifted state is maintained by inertia. No inconvenience occurs.

The pressing force of the deceleration roll 46 may need to be changed depending on the paper quality and printing condition. In this case, when an attempt is made to increase the pressing force, the distance between the upper and lower adjustment nuts 64u and 64d is adjusted to be small.
This is performed by screwing the connecting rod 62 so as to descend close to zero. At this time, the swing arm 50
Since the main adjustment screw 72 of the lifting mechanism 70 at the rear end is fixed at the rolling contact position of the reduction roll 46, only the pushing-up reaction force is adjusted. Conversely, when the pressing force is reduced, adjustment is performed so that the distance between the upper and lower adjustment nuts 64u and 64d is increased, and this may be normally performed by screwing the upper adjustment nut 64u away from the holder unit 60.

Depending on the printing condition, it may be necessary to partially separate the speed reduction roll 46 from the cut sheet. In this case, the weight releasing screw 76 of the lifting mechanism 70 provided at the rear end of the swing arm 50 is screwed. Then, the tip may be protruded from the tip of the main adjustment screw 72, and the arm 50 may be rotated clockwise in FIG. Thereby, the deceleration roll 46 can be held at the floating position. Then, when shifting from the floating holding to the normal rolling contact state, the weight releasing screw 76 may be returned and rotated so that the tip is drawn into the main adjusting screw 72. Accordingly, the rotation of the swing arm 50 is stopped again by the main adjusting screw 72, and the returned deceleration roll 46 is brought into the initially set contact position and has the contact pressure set by the initially set spring 66. Adjustment 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 with a screw while hooking the arm portion on the side.

Next, FIGS. 3 and 4 show a second embodiment. In the first embodiment, while the connecting rod 62 is arranged upright,
On the other hand, in the second embodiment, the connecting rod 62 is connected to the swing arm 5 in the second embodiment.
While being arranged in a direction substantially parallel to 0, it is pivotally attached to the fixed base side,
The difference is that the bracket is penetrated by a bracket provided on the swing arm 50. That is, the stand block 54A fixed to the hinge shaft 44 is inclined and the connecting rod 62 is pivotally attached to the upper end of the block. On the other hand, an L-shaped bracket 86 is attached in the middle of the swing arm 50, and a holder portion 60A with a spherical joint is formed at the tip. The connecting rod 62 is attached to the joint inner 60a of the holder portion 60A.
And the connecting rod 62 guides the holder portion 60A that moves left and right with the swing of the swing arm 50. A pair of adjusting nuts 64R and 64L are screwed to the connecting rod 62, and springs 66R and 66L are interposed between the connecting nut 62 and the joint inner 60a.

It is needless to say that the speed reducer constructed as described above operates similarly to the first embodiment and can easily adjust the contact pressure of the speed reducer roll 46. In this embodiment, in particular, since the connecting rod 62 has a horizontal structure, the bulk is reduced, the running obstacle of the tape passing above can be avoided, and the operation of the adjusting nut 64 is relatively easy. .

[0027]

As described above, according to the present invention,
A rod is attached to one of the fixed base attached to the hinge shaft and the swing arm via a rotating pin, and a holder having a rotary joint for inserting the rod is provided on the other, and the rod is sandwiched by the holder. By disposing the springs on both sides of the spring and attaching the urging force adjusting nut of each spring to the rod, the rolling contact pressure of the reduction roll can be adjusted, so that the contact pressure of the reduction roll can be easily adjusted arbitrarily. Is possible,
Even when a shock or the like that causes the roll to float is applied, the present state can be easily restored, so that an effect that the adjustment operation and the retraction operation according to the paper quality and the printing state can be performed extremely easily can be obtained.

[Brief description of the drawings]

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

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

FIG. 3 is a side view of a speed reducer according to a second embodiment.

FIG. 4 is a partial cross-sectional plan view of the device of the embodiment.

FIG. 5 is a side view showing the overall configuration of the theta.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 sheeter 12 printing web 14 cutting 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 reduction gear 44 Hinge shaft 46 Deceleration roll 50 Swing arm 52 Fixed shaft 54 Stand block 56 Bracket 58 Contact pressure adjusting mechanism 60 Holder section 60a Joint inner 62 Connecting rod 64 Vertical adjustment nut 66 Spring 68 Base 70 Lifting mechanism 72 Main adjustment screw 74 Adjustment nut 76 Weight relief screw 78 Adjustment nut 80 Belt holding roller 82 Side arm 84 Snapper roll 86 Bracket

Claims (4)

(57) [Claims] A deceleration roll mounted on a swing arm pivotally supported by a hinge shaft, the deceleration roll being rolled in contact with a transport belt to receive cut paper at a rolling engagement portion. An apparatus, comprising: a fixed base attached to the hinge shaft; a rod attached to one of the swing arm via a rotating pin; and a holder provided with a rotating joint for inserting the rod to the other. A rotary printing press characterized in that a spring is disposed on both sides of the rod with a portion interposed therebetween, and a nut for adjusting the biasing force of each spring is attached to the rod, whereby the rolling contact pressure of the reduction roll can be adjusted. Theta reduction gear. 2. A deceleration roll having a reduction roll attached to a swing arm pivotally supported by a hinge shaft, wherein the reduction roll is brought into rolling contact with a transport belt so as to receive a cut sheet at a rolling engagement portion. An apparatus, wherein a rod is attached to the swing arm via a rotation pin, a holder provided with a rotation joint for inserting the rod through a fixed frame provided on the hinge shaft, and the holder is sandwiched between the holder. A speed reducer for a rotary printing press sheeter, wherein springs are arranged on both sides of a rod, and a nut for adjusting the biasing force of each spring is attached to the rod so that the rolling contact pressure of a speed reduction roll can be adjusted. . 3. A deceleration roll having a reduction roll attached to a swing arm pivotally supported by a hinge shaft, wherein the reduction roll is brought into rolling contact with a transport belt to receive cut paper at a rolling engagement portion. An apparatus, wherein a rod is attached to a fixed base provided on the hinge shaft via a rotating pin, and the swing arm is provided with a holder section having a rotary joint for inserting the rod, and the holder section is sandwiched. A decelerator for a rotary printing press sheeter, wherein springs are arranged on both sides of the rod, and a biasing force adjusting nut of each spring is attached to the rod to adjust a rolling contact pressure of a reduction roll. apparatus. 4. The fixed base is provided with a double screw mechanism for holding a swing arm at a roll contact position of a reduction roll, and a reduction screw can be floated and held by projecting a center screw. The speed reducer for a theta for a rotary printing press according to any one of claims 1 to 3.