JP2001010752A - Paper feeding speed adjusting device for printing part of form printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the paper feeding speed by an impression cylinder in response to the printing condition by rotating a plate cylinder, a blanket cylinder and the impression cylinder with a separate rotating force transmitting means provided in parallel with each other, and during this rotation, operating a change gear. SOLUTION: In the case of installing a replacement cylinder unit 5' corresponding to each head and ail size in a printing unit 5, a driven gear 14 of a plate cylinder is engaged with an intermediate gear 38 of the lowest flow side of a first rotating force transmitting means 13a. In response to the position change of a driven gear 17 of an impressing cylinder, an intermediate gear 24 of the lowest flow side of a second rotating force transmitting means 13b is moved by an air cylinder device 19 so as to be engaged with the driven gear 17 of the impression cylinder. The rotating force of a motive force transmitting device 13 is transmitted to the plate cylinder and the blanket cylinder through the first rotating force transmitting device 13a, and transmitted to the impression cylinder 8 through the second rotating force transmitting device 13b. Rotating speed of the impression cylinder is separately adjusted in relation to the plate cylinder and the blanket cylinder by operating a change gear for adjustment, and feeding speed of the paper wound around the impression cylinder side for traveling is thereby adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to printing, punching,
The present invention relates to a device for adjusting the paper feed speed of a printing unit in a form printing machine that continuously performs processing such as perforation.

[0002]

2. Description of the Related Art In a business form printing machine, setting a paper feed speed of a plurality of rollers from a paper feed unit to a print unit, a processing unit, and a feed unit in an appropriate relationship allows the paper to run stably without meandering. The point is to give proper tension to the paper, to stabilize the elongation of the paper that is easily affected by the tension, and to improve the printing pitch accuracy, the top and bottom of printing and processing, and the right and left registration accuracy.

[0003]

However, the above-described conventional form printing machine has the following problems. (1) Since the paper feeding speed changes according to the thickness of the paper wrapped around the drum, if the thickness of the paper flowing into the machine changes due to work change or the like, the tension between the roller nips in the machine changes. That is, if d is the diameter of the body, N is the same number of revolutions, and t is the paper thickness, the paper feed speed V is given by V = N (d + t) π, and the paper feed speed increases as t increases. The smaller the diameter of the roller, the more easily the paper thickness t is affected, and the faster the paper is fed. Therefore, if the downstream roller has a smaller diameter than the upstream roller diameter, the thicker the paper thickness,
The downstream roller tends to feed the paper faster than the upstream roller, so that the tension tends to be higher.
Conversely, when the diameter of the roller on the upstream side is small, the tension is low because a large amount of paper is sent out on the upstream side, and the paper sags and the paper is meandering.

(2) In a form printing machine using an exchange cylinder unit, the exchange cylinder unit is exchanged every time the top and bottom sizes are exchanged. Each time the unit is replaced, the paper tension changes between roller nips.

(3) In printing using fountain solution, the paper is easily stretched. For this reason, if a printing unit that does not use fountain solution is printed with low tension acting on the paper unless it is printed, the printing will not be performed. Since the length becomes shorter in the vertical direction, it is necessary to individually adjust the tension acting on the paper for each printing unit.

(4) To solve the above problem,
As shown in JP-A-51456, some printing units are provided with speed changing means for changing the impression cylinder speed independently of the plate cylinder and the blanket cylinder between the blanket cylinder and the rotational force transmitting means. However, in the form printing using the exchange cylinder unit, the impression cylinder speed change means must be attached to all the exchange cylinder units manufactured for each of the top and bottom sizes. In the case of printing a size, an impression cylinder transmission means having the same structure as that of the 50 types had to be attached to each exchange cylinder unit, which was expensive. Also, in the configuration of this conventional technology,
Since the impression cylinder is rotated via the plate cylinder and blanket cylinder, the rotational force transmission system leading to the impression cylinder becomes longer, and errors such as backlash of the rotational force transmission system are reduced. There is a problem that the printing accuracy is adversely affected due to the accumulation on the side, and the rotation angle of the impression cylinder varies.

[0007] For these reasons, in a form printing machine for printing business forms, particularly in a printing unit, fluctuations in the rotation angle of the impression cylinder due to errors in the rotational force transmission system can be reduced, so that printing accuracy is improved, and paper feeding is performed. It was desired that the speed could be individually adjusted at low cost.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and has a structure in which a printing unit prints by a plate cylinder, a blanket cylinder, and an impression cylinder. In a form printing machine in which units are configured, in a form printing machine in which a printing unit of a printing unit is configured by a plate cylinder, a blanket cylinder, and an impression cylinder,
A first rotational force transmitting means for rotating the plate cylinder and the blanket cylinder and a second rotational force transmitting means for rotating the impression cylinder are provided in parallel, and the rotational speed of the impression cylinder is provided to the second rotational force transmitting means. The structure is provided with a speed changing means for changing.

Further, in the above construction, at least one of the blanket cylinder and the impression cylinder can be brought into contact with and separated from the other cylinder, and the rotational transmission force is transmitted to the first rotational force transmitting means for rotating the plate cylinder and the blanket cylinder. The configuration is such that a rotary intermittent mechanism for intermittent connection is provided.

In each of the above-described configurations, the exchange cylinder unit is configured such that the plate cylinder, the blanket cylinder, and the impression cylinder of the printing unit are supported on the subframe and can be mounted on and removed from the printing unit. Of the driven member and the first
The rotational force transmitting member on the most downstream side of the rotational force transmitting means is detachably connected to the exchange unit in accordance with the loading / unloading of the exchange cylinder unit to the printing unit, and the rotational force transmitting on the most downstream side of the second rotational force transmitting means is connected. The member is movable in the direction of contact and separation with respect to the driven member of the impression cylinder of the exchange cylinder unit mounted on the printing unit.

[0011]

The plate cylinder and the blanket cylinder are driven to rotate by a first torque transmitting means, and the impression cylinder is driven to rotate by a second torque transmitting means. By operating the speed change means interposed in the second rotational force transmitting means, the rotation speed of the impression cylinder can be adjusted independently of the other cylinders (plate cylinder, blanket cylinder), and the paper can be transferred by the impression cylinder. The feed speed can be adjusted according to the thickness of the paper, the variation in the thick body diameter, and the printing conditions.

The blanket cylinder and the impression cylinder can be separated from and separated from each other,
In the case where the rotation intermittent mechanism is provided in the first rotational force transmitting means, the rotation of the plate cylinder and the blanket cylinder is stopped by turning off the rotation intermittent mechanism. By separating the blanket cylinder and the impression cylinder in this state, only the impression cylinder is rotated by the second rotational force transmitting means, and the traveling of the paper wound therearound is continued. During this time, the printing plate of the plate cylinder stopped is replaced. Thus, in the printing unit, the printing plate of the plate cylinder can be changed while the paper is running non-stop.

When the plate cylinder, blanket cylinder, and impression cylinder are exchange cylinder units, the exchange cylinder unit is exchanged for the printing unit, so that the top and bottom sizes can be exchanged.

At this time, in the case of the exchange cylinder units having different top and bottom sizes, the distance between the driven member of the impression cylinder and the rotational force transmission means on the most downstream side of the second rotational force transmission means changes, so that the exchange cylinder unit has After the exchange, the rotational force transmitting member on the most downstream side of the second rotational force transmitting means is moved and joined to the driven member of the impression cylinder of the exchange cylinder unit.

[0015]

FIG. 1 to FIG. 4 show a first embodiment of the present invention. FIG. 1 shows an example of a form printing machine capable of performing multicolor printing in which the present invention is to be implemented. Reference numeral 1 denotes a paper feeding unit, 2 denotes a printing unit, 3 denotes a processing unit, and 4 denotes a folding unit. The printing unit 2 includes a plurality of printing units 5, 5,... For performing printing for each color. The printing cylinder of each printing unit 5 includes a plate cylinder 6, a blanket cylinder 7, and an impression cylinder 8.

FIG. 2 shows a configuration for transmitting a rotational force to each printing unit 5. In the figure, reference numeral 10 denotes an infeed roll for feeding out the paper P. The infeed roll 10 is driven by a drive shaft 11 via a power transmission device 12. The drive shaft 11 is connected to a motor (not shown). The drive shaft 11 is provided with a power transmission device (drive source) 13 for transmitting power to each printing unit 5 corresponding to each printing unit 5.

In each printing unit 5, the plate cylinder 6 is connected to the same power transmission device 13 via the first rotational force transmitting means 13a, and the impression cylinder 8 is connected to the same power transmitting device 13 via the second rotational force transmitting means 13b. They are connected in parallel. And the second
The rotational force transmitting means 13b has a speed changing means 20 for changing the rotational speed of the impression cylinder 8. The blanket cylinder 7 is driven to rotate by the plate cylinder 6.

In this embodiment, the plate cylinder 6, blanket cylinder 7, and impression cylinder 8 constitute an exchange cylinder unit 5 'supported by a sub-frame which is detachable from the frame of the printing unit 5. Therefore, it can be exchanged according to the exchange of the top and bottom size.

First and second rotational force transmitting means 13a, 13b in the printing unit 5 using the exchange cylinder unit 5 '.
3 will be described with reference to FIGS. The first rotational force transmitting means 13a includes an output gear 28 rotated by the power transmitting device 13 via gears 26 and 27, and intermediate gears 33 and 3.
4, 35, 36, 37 and 38. The intermediate gear 38 on the most downstream side of the first rotational force transmitting means 13a is attached to and detached from the printing unit 5 by the driven gear 14, which is integrally formed with the shaft 6a of the plate cylinder 6. In order to engage with each other. A driven gear 15 having the same number of teeth as the driven gear 14 is provided on the blanket cylinder 7 so as to be integrated with the shaft 7a. The driven gears 14 and 15 mesh with each other. It is driven to rotate at the same speed in the opposite direction.

The second torque transmitting means 13b includes the output gear 28 and the intermediate gears 29, 30, 22, 23, 24,
25. The intermediate gear 25 on the most downstream side of the second torque transmitting means 13b is connected to the shaft 8a of the impression cylinder 8.
And the driven gear 17 provided integrally with the driven gear 17. The driven gear 17 has the same number of teeth as the driven gears 14 and 15 of the other cylinders 6 and 7.

The intermediate gear 25 on the most downstream side of the second rotational force transmitting means 13b is supported by a support arm 21 coaxially with one intermediate gear 24 on the upstream side. This support arm 21 is rotatable about the axis of two upstream intermediate gears 23.
Is rotated by the air cylinder device 19 so that the intermediate gear 25 on the most downstream side moves in the direction of contact and separation with the driven gear 17 of the impression cylinder 8. In addition, in FIG.
Reference numerals a and 25a denote bearers that regulate the meshing between the driven gear 17 and the intermediate gear 25.

An auxiliary driven gear 16 having the same number of teeth as the driven gear 17 and meshing with the driven gear 15 of the blanket cylinder 7 is rotatably supported on a shaft 8a of the impression cylinder 8 by a bearing 16a. The auxiliary driven gear 16 is the driven gear 1
7, a driven gear 17
It is connected so that it can be disengaged. Locking pin 1
8 is a screw rod, and by screwing it in,
The tip of the pin hole 1 is provided on the side surface of the auxiliary driven gear 16.
6b.

A transmission means 20 is interposed on a shaft between the coaxially supported intermediate gears 22 and 23 of the second torque transmitting means 13b. This transmission means 20 is a well-known differential type transmission, a harmonic drive (trade name) 20a.
Is used. And this harmonic drive 2
The gear 32a of the adjusting motor 32 meshes with the web generator gear 31 of the motor drive 0a. By changing the rotating speed of the web generator gear 31 by adjusting the rotating speed of the adjusting motor 32, the output side of the harmonic drive 20a is changed. The rotation speed of the gear 23 is changed.

In the above configuration, the exchange cylinder unit 5 'corresponding to each of the top and bottom sizes of the printed matter is attached to the printing unit 5. At this time, the driven gear 14 of the plate cylinder 6 is meshed with the intermediate gear 38 on the most downstream side of the first torque transmitting means 13a. On the other hand, the position of the driven gear 17 of the impression cylinder 8 changes depending on the size of the top and bottom, and the intermediate gear 24 on the most downstream side of the second torque transmitting means 13b is connected to the air cylinder device 19 in accordance with this change in position. To engage the driven gear 17 of the impression cylinder 8.

The rotational force of the power transmitting device 13 is transmitted to the plate cylinder 6 and the blanket cylinder 7 through the first rotational force transmitting means 13a.
And transmitted to the impression cylinder 8 via the second torque transmitting means 13b. At this time, the rotational speed of the impression cylinder 8 is independently adjusted with respect to the plate cylinder 6 and the blanket cylinder 7 by performing an adjusting operation of the transmission means 20. Thereby, the feed speed of the paper P wound around the impression cylinder 8 and traveling is adjusted.

The speed changing means 20 for adjusting the rotation speed of the impression cylinder 8 is the second rotation force transmitting means 13b of the printing unit 5.
It is not necessary to provide the speed change means 20 on the side of the exchange cylinder unit 5 '.

The above-mentioned exchange cylinder unit 5 'can be mounted on the printing unit 5 which does not have the second torque transmitting means 13b. In this case, since the rotational force transmitting means is not connected to the driven gear 17 of the impression cylinder 8, the locking pin 18 is operated to engage the driven gear 17 of the impression cylinder 8 with the auxiliary driven gear 16. Since the auxiliary driven gear 16 meshes with the driven gear 15 of the blanket cylinder 7, the impression cylinder 8 is driven to rotate with respect to the blanket cylinder 7.

FIGS. 5 and 6 show a second embodiment of the present invention. In the second embodiment, the first torque transmitting means 1
The drive sources of the 3a 'and the second torque transmitting means 13b' are separately provided, and the same members as those in the first embodiment are denoted by the same reference numerals and will be described below.

As in the case of the first embodiment, the first torque transmitting means 13a 'includes an output gear 28 rotated by the power transmitting device 13' via gears 26 and 27, and an intermediate gear 33, 34, 35, 36, 37, and 38. The intermediate gear 38 at the most downstream side of the first rotation transmitting means 13a 'is removably engaged with the driven gear 14 of the plate cylinder 6 of the exchange cylinder unit 5'.

The power transmission device 13 'transmits the rotation of the drive shaft 11 to the output gear 28.
A power intermittent clutch 41 for intermittently transmitting the rotation to the motor 8 is provided. Reference numeral 42 denotes an operation lever for performing the intermittent operation.

A drive motor 43 is connected to an intermediate gear upstream of the most downstream intermediate gear 25 of the second rotational force transmitting means 13b ', for example, a shaft 23a of the intermediate gear 23 which is a fulcrum of the support arm 21. The drive motor 43 is a drive source of the second torque transmitting means 13b '. The drive motor 43 is a motor such as a servo motor that can arbitrarily adjust the rotation speed.

The shafts 7a, 8a of the blanket cylinder 7 and the impression cylinder 8 are supported on the sub-frame side via eccentric bearings 44, 45, and these eccentric bearings 44, 45 are mounted on a cylinder device or a worm wheel device. The blanket cylinder 7 and the impression cylinder 8 are rotated by appropriate operating means.
Are moved toward and away from each other. The eccentric bearing may be provided on only one of the blanket cylinder 7 and the impression cylinder 8.

In the configuration of the second embodiment described above, by setting the on / off clutch 41 of the power transmission device 13 'to "continuous", the rotational power of the power transmission device 13' is reduced to the first power.
Driven gear 1 of the plate cylinder 6 via the rotational force transmitting means 13a '
4, the plate cylinder 6 and the blanket cylinder 7 are rotationally driven.

On the other hand, by driving the drive motor 42, the impression cylinder 8 is rotated via the second torque transmitting means 13b '. At this time, the rotational speed of the drive motor 43 is adjusted so that the impression cylinder 8 rotates in synchronization with the blanket cylinder 7. The rotational speed of the impression cylinder 8 is changed by this adjustment.

The exchange cylinder 5 'is appropriately exchanged by changing the top and bottom sizes. At this time, the position of the impression cylinder 8 is changed by connecting the intermediate gear 25 on the most downstream side of the second torque transmitting means 13b' to the air cylinder device. It is absorbed by moving at 19.

The plate cylinder 6 and the blanket cylinder 7 are stopped by disengaging the on-off clutch 41 of the power transmission device 13 '. On the other hand, by stopping the drive motor 43, the impression cylinder 8 is stopped. Further, by driving the drive motor 43 with the plate cylinder 6 and the blanket cylinder 7 stopped as described above, only the impression cylinder 8 can be rotated. At this time, at least one of the eccentric bearings 43 and 44 of the blanket cylinder 7 and the impression cylinder 8 is operated to separate the blanket cylinder 7 and the impression cylinder 8 from each other.

By rotating only the impression cylinder 8 as described above, the traveling of the paper P can be continued with the plate cylinder 6 and the blanket cylinder 7 stopped. Therefore, paper P
Is stopped, the plate cylinder 6 is stopped, and the plate 46 can be exchanged for the plate cylinder 6.

Next, an example of use of the second embodiment will be described.
I will tell. For example, as shown in FIG.
From the upstream side of a four-color printing form printing machine
First and second printing units 5₁, 5₂Two-color painting at
The pattern is printed, and the third and fourth printing units 5₃, 5₄To
For example, select the store name of different stores (A, B, C ...)
Printing. And this store name printing
Printing unit 5₃, 5 ₄In the second embodiment,
Use a printing unit.

A case where the shop names of the shops A, B, C,... Are printed by a predetermined number of sheets will be described below.

[0040] First of all, all of the printing unit of the paper P ₅ 1 ~
5 ₄ pass between the bracket cylinder 7 and the impression cylinder 8. And for example, in advance, if you install a printing plate A merchant's shop name on the third plate cylinder 6 of the printing unit ₃ of the contact bracket cylinder 7 and the impression cylinder 8 of the third printing unit ₃ In this state, the first and second torque transmitting means 13a 'and 13b' are driven. Meanwhile the fourth printing unit 5 ₄ together with spaced brackets cylinder 7 and the impression cylinder 8, keep the rotary drive only the impression cylinder 8 by a second rotational force transmitting means 13b '.

[0041] Thus, a pattern according to the first and second printing units ₅ 1, _{5 2} on the paper P, merchant name A merchant by the third printing unit ₃ is printed. And during this time, the fourth plate cylinder 6 that is stopped in the printing unit ₄ of the rotating manually which to mount the printing plate for shop name B shops. Further, if necessary, the blanket of the bracket body 7 is washed.

[0042] When the printing of a predetermined number of said A merchant merchant name is completed, as well as separating the third bracket cylinder 7 of the printing unit ₃ of the impression cylinder 8, to stop the plate cylinder 6 and blanket cylinder 7, The rotation of the impression cylinder 8 is continued. At the same time, the plate cylinder 6 is rotated together with the contacting the fifth blanket cylinder 7 and the impression cylinder 8 in the printing unit 5 ₄ fitted with a printing plate for shop name B shops.

[0043] Thus, a pattern according to the first and second printing units ₅ 1, _{5 2} on the paper P, shop name B shops by the fourth printing unit _{5 4} are printed. And during this time, the plate cylinder 6 is stopped in the third printing unit ₃ is rotated manually and replace this printing plate in a printing plate for C merchant merchant name. Also, if necessary, wash the blanket.

When printing of a predetermined number of the store name of the B store is completed, the printing plate of the store name of the B store is attached in the same procedure as the exchange of the store name of the B store from the store name of the A store. printing by 4 printing units 5 ₄ stops and starts printing according to the third printing unit ₃ equipped with a printing plate for C merchant merchant name.

As described above, according to this embodiment, printing plates for different pictures can be selectively replaced while the paper is running, and one of the pictures to be printed in multiple colors is printed. Copies can be converted without stopping the printing press, and this type of printing can be performed efficiently.

In each of the above embodiments, the exchange cylinder type form printing machine has been described. However, the present invention can be applied to a fixed cylinder type form printing machine in which each printing cylinder is not exchanged. In this case, the first torque transmitting means 13a, 1
The intermediate gear 33 on the most downstream side of 3a 'and the driven gear 1 of the plate cylinder 6
4, and the intermediate gear 25 on the most downstream side of the second rotational force transmitting means 13b, 13b 'and the driven gear 17 of the impression cylinder 8 are meshed without being disengageable. Therefore, it is not necessary to make the intermediate gear 25 at the most downstream side of the second torque transmitting means 13b, 13b 'movable.

In the second embodiment, the first and second rotational force transmitting means are connected to separate driving sources, so that the rotational speeds of the plate cylinder, blanket cylinder, and impression cylinder can be separately controlled. , And can be arbitrarily controlled.

[0048]

According to the present invention, the plate cylinder, the blanket cylinder, and the impression cylinder are rotated by separate rotational force transmitting means provided in parallel, and during this time, the pressure is controlled by operating the speed change means. The rotational speed of the cylinder is adjusted with respect to the blanket cylinder. This makes it possible to adjust the feed speed of the paper by the impression cylinder in accordance with the paper thickness of the paper, variations in the thickness of the drum, and printing conditions.

According to the present invention, in particular, the impression cylinder, which has a great influence on the paper feeding speed, is driven to rotate by another torque transmitting means different from other cylinders (plate cylinder, blanket cylinder). The length (the number of intermediate gears) of the rotational force transmitting means of the rotational force transmitting means for driving the impression cylinder is compared with a rotational force transmitting system in which the impression cylinder is driven via a plate cylinder and a blanket cylinder. Can be shortened.

Therefore, the number of torque transmitting members (intermediate gears) constituting the torque transmitting means for rotationally driving the impression cylinder is reduced, and the accumulation of errors between the torque transmitting members is reduced. Variations in the rotation angle of the impression cylinder due to errors in the transmission system can be reduced, and the quality of printed matter can be improved.

Further, the blanket cylinder and the impression cylinder can be separated from each other, the plate cylinder and the blanket cylinder can be stopped, and only the impression cylinder can be driven to rotate. The printing plate of the plate cylinder can be exchanged.

Therefore, in a form printing machine using a plurality of printing units, it is possible to selectively exchange a print pattern on a sheet running in a non-stop state.

Further, according to the present invention, since the plate cylinder, the blanket cylinder, and the impression cylinder are exchange cylinder units, an exchange cylinder unit corresponding to each change of the top-bottom size can be used, and one unit can be used. Form printing of different top and bottom sizes can be performed in the form printing machine.

According to the invention, in particular, the driven member of the impression cylinder of the exchange cylinder unit is connected to the most downstream rotation transmission member of the second rotational force transmission means having the speed change means, so that the pressure cylinder The speed change means for adjusting the rotation speed does not need to be provided on each of the exchange cylinder units. Therefore, the configuration of each of the exchange cylinder units capable of adjusting the rotation speed of the impression cylinder can be simple and inexpensive, and the feed speed adjusting device of the printing unit in the exchange cylinder type form printing machine can be inexpensive. .

[Brief description of the drawings]

FIG. 1 is an overall view of a form printing machine to which the present invention is applied.

FIG. 2 is a schematic configuration explanatory view showing a first embodiment of the present invention.

FIG. 3 is a front view specifically showing the first embodiment of the present invention.

FIG. 4 is a partially cutaway side view showing the first embodiment of the present invention.

FIG. 5 is a front view specifically showing a second embodiment of the present invention.

FIG. 6 is a partially cutaway side view showing a second embodiment of the present invention.

FIG. 7 is an explanatory diagram of a usage example according to the second embodiment of this invention;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Paper feed part, 2 ... Printing part, 3 ... Processing part, 4 ... Folding part, 5 ...
Printing unit, 5 '... Replacement cylinder unit, 6 ... Plate cylinder, 7 ...
Blanket, 7a ... shaft, 8 ... impression cylinder, 8a ... shaft, 10 ...
Infeed roll, 11 ... drive shaft, 12, 13, 1
3 '... power transmission device, 13a, 13a', 13b, 13
b ': rotational force transmitting means, 14, 15, 17: driven gear,
Reference numeral 16: auxiliary driven gear, 18: locking pin, 19: air cylinder device, 20: transmission means, 21: support arm, 2
2,23,24,25,26,27,28,29,3
0, 31, 32a, 33, 34, 35, 36, 38: gear, 41: intermittent clutch, 42: operating lever, 43: drive motor, 44, 45: eccentric bearing, 46: printing plate.

Claims (3)

[Claims] In a form printing machine in which a printing unit of a printing unit is constituted by a plate cylinder, a blanket cylinder and an impression cylinder, first rotational force transmitting means for rotating the plate cylinder and the blanket cylinder, and rotating the impression cylinder And a second rotational force transmitting means provided in parallel with the second rotational force transmitting means, and a speed changing means for changing a rotation speed of the impression cylinder, the second rotational force transmitting means being provided with a paper feed of a printing unit in a form printing machine. Speed adjustment device. 2. The method according to claim 1, wherein at least one of the blanket cylinder and the impression cylinder is configured to be able to move toward and away from the other cylinder, and to intermittently transmit a rotation transmitting force to first rotational force transmitting means for rotating the plate cylinder and the blanket cylinder. The paper feed speed adjusting device for a printing unit in a form printing machine according to claim 1, further comprising a rotation intermittent mechanism. 3. An exchange cylinder unit in which a plate cylinder, a blanket cylinder, and an impression cylinder of a printing unit are supported on a sub-frame and can be attached to and detached from the printing unit. The rotational force transmitting member at the most downstream side of the first rotational force transmitting means is detachably connected to the rotational force transmitting member in accordance with the mounting and dismounting of the exchange cylinder unit to the printing unit, and the rotational force at the most downstream side of the second rotational force transmitting means is connected. 3. The printing unit according to claim 1, wherein the transmission member is movable in the direction of contact and separation with respect to a driven member of the impression cylinder of the replacement cylinder unit mounted on the printing unit. Paper feed speed adjustment device.