JP4639132B2 - Sheet-fed printing machine paper discharge device - Google Patents

Description

  The present invention relates to a sheet discharge device for a sheet-fed printing press, and more particularly to a sheet discharge device for a sheet-fed printing press having a function of suppressing vibration.

The sheet discharge device of the sheet-fed printing machine is a part that receives the printed sheet from the transfer cylinder and conveys it to the sheet discharge table. This paper discharge device picks up a sheet with nail claws passed between two chains wound around a sprocket of a delivery cylinder, moves it to a paper discharge table, and discharges it. By the way, since the chain rotates in a state of being tensioned with a predetermined tension, vibration may occur in the chain and the chain body. In addition, since there is a delivery by changing the sheet between the transfer cylinder and the claw, vibration may occur even when the claw is opened and closed. This vibration is transmitted from the transfer cylinder to the printing unit including the impression cylinder, the blanket cylinder, the plate cylinder, and the like, and there is a possibility that a printing failure, for example, a shocking eye or a registration failure may occur. However, there has been no report on an example of dealing with such a vibration of the delivery unit in a sheet-fed printing press.
Although not directly related to the printing press, examples of using a powder brake to attenuate the vibration of the servo system of the laser processing machine and the vibration of the steering system of the car have been reported (see Patent Documents 1 and 2). .)
JP-A-6-15474 JP 2003-34255 A

As described above, in the sheet discharge device of the sheet-fed printing press, vibration is generated from the two chains wound around the sprocket of the delivery cylinder, and this vibration is transmitted to the printing unit and may cause a printing failure. .
The present invention solves this problem in a relatively simple manner, and the sheet printing machine does not cause the chain to vibrate and does not adversely affect the printing operation of the printing unit due to the vibration of the paper discharge unit. It is an object to realize a paper discharge device.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention is characterized in that a sheet of paper after printing is held by a nail of a nail clip passed between two chains wound around a sprocket of a delivery cylinder. The paper discharge device that is transported and loaded on the paper discharge unit includes a rotation braking device that continuously applies a predetermined amount of braking torque to the rotation shaft of the delivery cylinder that drives the travel of the chain.

In order to solve the above-mentioned problem, the invention according to claim 2 is the paper discharge device according to claim 1 , wherein the rotary braking device is a powder brake device that applies electromagnetic braking to a rotating shaft.

  Since the present invention is configured as described above, it is possible to easily apply braking to the running of the chain, and this braking can suppress the occurrence of vibration in the chain and the like, and the vibration adversely affects the printing unit. It is possible to realize a paper discharge device that never happens. Braking can be performed relatively easily by applying a braking torque to the rotation shaft of the delivery cylinder. In particular, since the braking torque can be easily made variable by using a powder brake device, it is easy to control the occurrence of vibration. is there.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view of an embodiment of a sheet discharge device for a sheet-fed printing press according to the present invention, and FIG. 2 is a cross-sectional plan view taken along the plane AA of FIG. 1 and 2, reference numeral 1 is a delivery cylinder, reference numeral 2 is a transfer cylinder, reference numeral 3 is a chain, reference numeral 4 is a sprocket, reference numeral 5 is a rotating shaft, reference numeral 6 is a delivery gear, reference numeral 7 is a rail, reference numeral 8 is a frame, Reference numeral 9 is a paper release adjusting mechanism, reference numeral 10 is a chain tension bolt, reference numeral 11 is a chain gripper, reference numeral 12 is a powder brake, reference numerals 13 and 15 are mounting pins, reference numeral 14 is a first auxiliary frame, reference numeral 16 is a second It is an auxiliary frame. Reference numeral 19 denotes a printing unit. In FIG. 1, reference numeral P denotes a printing unit, and reference numeral D denotes a paper discharge device.
The paper release adjusting mechanism 9 includes cams 9a and 9b provided inside the left and right chains 3 and 3, a rod 9c for interlocking the left and right cams 9a and 9b, and an adjustment lever for rotating the rod 9c via gears 9d and 9e. 9f. The chain tension bolt 10 rotates the chain shaft 4a forward and backward to adjust the tension of the chain 3.
FIG. 3 shows a plan view of the chain gripper 11. In FIG. 3, reference numeral 21 denotes a claw hook, reference numeral 22 denotes a claw, and reference numeral 23 denotes a claw shaft. The chain gripper 11 is constituted by these, and the claw hook 21 is passed between the left and right chains 3.

In this paper discharge device, a sheet gripper 11 provided between a pair of left and right chains 3 wound around a sprocket of a delivery cylinder 1 is fed with a sheet fed from a transfer cylinder 2 located at the end of a printing unit 19. The paper is moved to a predetermined position and discharged. The chain gripper 11 picks up and moves the sheet with the claw 22 provided on the claw cage 21 passed between the chains 3, and opens and discharges the sheet at a predetermined position. The delivery cylinder 1 is rotated by a rotational force applied via the delivery gear 6.
With this configuration, the tension of the chain 3 is adjusted by the chain tension bolt 10, and the sheet discharge position is adjusted by the paper release adjusting mechanism 9. The discharged sheets are sequentially stacked on a discharge unit (not shown).

  By the way, in this embodiment, the chain gripper 11 is moved by using the chain 3 and the sheet is moved and discharged, so that vibration caused by the running operation of the chain 3 and vibration due to opening and closing of the claw 22 can occur. There is sex. When such vibration occurs, the vibration propagates through the transfer cylinder 2 to the printing unit 19 including the impression cylinder, the blanket cylinder, the plate cylinder, etc., and has a printing trouble such as occurrence of shock eyes or registration failure. There is a risk of causing.

As one method for suppressing the occurrence of such vibration, a method of applying a predetermined load to the traveling operation of the chain 3 can be considered. If a load is continuously applied to the running of the chain 3, the generation of vibration can be suppressed. For example, a method of braking the travel of the chain 3 by applying a predetermined braking torque to the rotating shaft 5 that rotates the chain 3 is an example.
For such purposes, it is preferable that the control amount of the braking torque can be freely controlled. From such an idea, the powder brake 12 is employed in the present embodiment.

  As shown in FIG. 2, the powder brake 12 has a first auxiliary frame 14 attached via an attachment pin 13 and a second auxiliary frame 16 attached via an attachment pin 15, and the powder brake 12 is mounted on the second auxiliary frame 16. It is provided. Thus, the shaft 12a of the powder brake 12 and the rotating shaft 5 of the delivery cylinder are connected.

Here, the function of the powder brake 12 will be briefly described.
4 and 5 are rotationally symmetric sectional views for explaining the basic structure of a powder clutch that also operates as a powder brake. 4 and 5, reference numeral 31 is a drive member shaft (input), reference numeral 32 is a drive member, reference numeral 33 is a driven member shaft (output), reference numeral 34 is a driven member, reference numeral 35 is powder (magnetic powder), Reference numeral 36 is a coil, reference numeral 37 is a stator, and reference numeral 38 is a magnetic flux. However, this shape is not necessarily limited to this, and an arbitrary shape can be adopted.

The drive member 32 and the driven member 34 are arranged on a concentric cylinder with a powder gap therebetween. When no current is flowing through the coil 36, the members 32 and 34 are supported by bearings so that they can rotate freely. It has been.
A powder (magnetic iron powder) 35 having a high magnetic permeability is placed in the powder gap, and an exciting coil 36 is arranged on the outer periphery of the stator 37 so that a magnetic flux can flow through the powder gap.
When the drive member 32 rotates without excitation, the powder 35 is pressed against the operating member of the drive member 32 by centrifugal force, and there is no connection between the drive member 32 and the driven member 34.

  Now, as shown in FIG. 5, when a current is passed through the coil 36 and excited, the powder 35 is connected and bound in a chain form along the magnetic flux 38 generated from the coil 36. Torque is transmitted from the drive member 32 to the driven member 34 due to the coupling force of the powder 35 and the friction between the powder 35 and the operating surfaces of the drive member 32 and driven member 34. Thus, a torque transmission friction clutch using the powder 35 from the drive member 32 to the driven member 34 as a medium is realized. When the output side driven member 34 is fixed, a powder brake is obtained.

In the powder clutch and the powder brake, the relationship between the excitation current and the transmission torque (braking torque) is almost proportional, and the transmission torque (braking torque) can be easily and stably controlled over a wide range by the current.
Further, since the powder 35 always works stably and normally, a very stable torque can be reproduced even if the current is repeatedly turned on and off.
Furthermore, there are few problems in use because there is little generation of noise and heat generation.

  In the present embodiment, the paper discharge device is actually operated, the current flowing in the coil 36 of the powder brake 12 is controlled while observing the vibration of the chain 3, and the coil current value of the powder brake 12 is set as small as possible. The value should be fixed to eliminate the vibration of. When the current value is determined, the powder brake 12 continues to output a predetermined braking torque stably, so that the vibration of the chain 3 can be suppressed.

  In the present embodiment, the powder brake 12 is used for braking the running operation of the chain 3, but the present invention is not necessarily limited to this, and a rotational braking device such as a viscous resistance device or a friction resistance device that applies braking to the rotating shaft 5 is used. Alternatively, a braking device that directly brakes the traveling of the chain 3 can be used.

  Since the present invention is configured as described above, it is possible to suppress the vibration of the chain by the paper discharge device of the sheet-fed printing press so that the vibration of the chain is transmitted and does not adversely affect the printing operation of the printing unit. . Therefore, the present invention can be widely used in the printing industry using a sheet-fed printing press and the manufacturing industry of a printing press.

It is a side view of the paper discharge device of the sheet-fed printing press of the present invention. FIG. 2 is a cross-sectional plan view of a paper discharge device of the sheet-fed printing press shown in FIG. 1. It is a top view of the chain gripper of the paper discharge apparatus of the sheet-fed printing press shown in FIG. It is a rotationally symmetric sectional view explaining the basic structure of a powder clutch. It is a rotationally symmetric sectional view explaining the basic structure of a powder clutch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Delivery cylinder 2 Transfer cylinder 3 Chain 4 Sprocket 5 Rotating shaft 6 Delivery gear 7 Rail 8 Frame 9 Paper release adjusting mechanism 10 Chain tension bolt 11 Chain gripper 12 Powder brake 13 Mounting pin 14 First auxiliary frame 15 Mounting pin 16 Second auxiliary frame DESCRIPTION OF SYMBOLS 19 Printing part 21 Claw 22 Claw 23 Claw shaft 31 Drive member shaft 32 Drive member 33 Driven member shaft 34 Driven member 35 Powder 36 Coil 37 Stator 38 Magnetic flux

Claims (2)

In the paper discharge device for picking up and transporting the printed sheet with the claws of the hooks passed between the two chains wound around the sprocket of the delivery cylinder,
A paper discharge device, comprising: a rotation braking device that continuously applies a predetermined amount of braking torque to a rotation shaft of the delivery cylinder that drives the travel of the chain. The paper discharge device according to claim 1 , wherein the rotary braking device is a powder brake device that applies electromagnetic braking to a rotating shaft .

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