JPH0592853A - Paper feeder - Google Patents

Abstract

PURPOSE:To facilitate maintenance and the regulation of contact pressure by providing an intermediate gear between the driving shafts of paper feed rollers, and providing the moving side paper feed roller rotatably around the axis of the intermediate gear. CONSTITUTION:An intermediate gear 43 is provided between the driving shafts 30, 31 of paper feed rollers 5, 11, and the moving side paper feed roller 11 is provided rotatably around the axis of the intermediate gear 43. Bearing levers 32, 33 are rotatably supported respectively on the shafts 30, 31. In air cylinders 22, one ends thereof are rotatably supported on hinges 44 through eccentric bushes 45, and the other ends are rotatably connected to the bearing levers 32, 33. The spacing of the paper feed rollers 5, 11 can be thereby adjusted by rotating the eccentric bushes 45 to change the rotational positions of the bearing levers 32, 33. The contact pressure between the fixed side paper feed roller 5 and moving side paper feed roller 11 can be set optionally by regulating the pressure of compressed air to be supplied to the air cylinders 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device for feeding paper into a folder of a rotary printing press.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show a conventional paper feeding apparatus, in which 1 is a frame of a folding machine. A bearing case 2 is fixed to one side of the frame 1. A fixed roller shaft 3 is rotatably supported by the bearing case 2 and the frame 1 via bearings 4A. Reference numeral 5 denotes a fixed-side paper feed roller, which is fixed to the roller shaft 3. A gear 6 is fixed to one end of the roller shaft 3.

A bearing pin 7 is fixed to the frame 1 so as to face each other. Reference numeral 8 denotes a bearing lever, which is rotatably supported by the bearing pin 7. Reference numeral 9 denotes a connecting bar which connects the bearing lever 8. A roller shaft 10 on the moving side is rotatably supported between bearing levers 8 via a bearing 4B. A paper feed roller 11 on the moving side is fixed to the roller shaft 10. A coupling flange 12 is fixed to one end of the roller shaft 10. A drive shaft 13 is rotatably supported by the frame 1 via a bearing 4C. A gear 14 is fixed to the drive shaft 13 so as to mesh with the gear 6. Reference numeral 15 is a universal joint using a slide bearing, which connects between the drive shaft 13 and the coupling flange 12.

A shaft 16 is rotatably supported by the frame 1. 17 is a cam roller lever, which slides on the shaft 16
It is fixedly supported. A cam roller 18 is rotatably supported by a cam roller lever 17 so as to contact the connecting bar 9. An operation lever 19 is rotatably attached to the cam roller lever 17, and the operation thereof fixes and releases the cam roller lever 17 to the shaft 16. A connecting lever 20 is fixed to the shaft 16. A hinge pin 21 is fixed to the frame 1. Reference numeral 22 is an air cylinder, one end of which is rotatably supported by the hinge pin 21, and the other end of which is rotatably coupled to the connecting lever 20.

A fixed shaft 23 is fixed between the frames 1. A nut 24 is fixed to the fixed shaft 23 so as to face the bearing lever 8. A stopper screw 25 is screwed into the nut 24. A lock nut 26 is screwed into the stopper screw 25.

With this structure, the air cylinder 22 is operated and the cam roller lever 17 is rotated about the shaft 16 to push the connecting bar 9 by the cam roller 18.
The bearing lever 8 is rotated about the bearing pin 7, and the paper feed roller 11 is moved toward and away from the paper feed roller 5.

Then, the paper feed roller 5 is replaced by the paper feed roller 1
1 is made to approach, the paper 27 is pinched, and it sends toward the cutter cylinders 28 and 29.

[0008]

In the above-described paper feeding device, the paper feeding roller 5 on the fixed side and the paper feeding roller 1 on the moving side depend on the thickness of the paper 27 and the design printed on the paper 27.
Universal joint 15 to adjust the interval of 1
Then, the shaft center of the roller shaft 10 supporting the paper feed roller 11 and the shaft center of the drive shaft 13 thereof are allowed to deviate from each other. However, the universal joint 15 using the slide bearing has a play in the rotational direction between the driving side and the driven side thereof, and unevenness occurs in the rotation of the paper feed roller 11. The unevenness of the rotation increases as the sliding portion of the universal joint 15 wears. Therefore, it is necessary to replace the universal joint 15 regularly.

Further, in order to apply a predetermined tension to the paper 27,
The paper feed rollers 5 and 11 rotate at a peripheral speed slightly higher than the feed speed of the paper 27, but the cutter cylinders 28 and 29 cause the paper 27 to rotate.
The impact at the time of cutting the paper is transmitted, and uneven rotation of the paper feed roller 11 is promoted. For this reason, the length of the paper 27 fed from the paper feeding device is changed, and the folding accuracy of the signature formed by the folding machine is reduced and defective products are generated. Further, if the printing speed of the printing machine is reduced in order to ensure the folding accuracy, the productivity will be reduced.

Further, when the contact pressure in the axial direction of the paper feed rollers 5 and 11 is changed according to the pattern printed on the paper 27, the position can be changed by changing the position of the cam roller lever 17. Requires a high degree of skill,
Moreover, it takes time.

In view of the above circumstances, an object of the present invention is to provide a paper feeding device which facilitates maintenance and facilitates adjustment of contact pressure.

[0012]

SUMMARY OF THE INVENTION To achieve the above object, the present invention synchronously rotates a fixed side paper feed roller and a drive shaft of a movable side paper feed roller that can be brought into contact with and separated from the paper feed roller. In the paper feeding device of the rotary printing press, which sandwiches and feeds the paper between the fixed side paper feed roller and the moving side paper feed roller, an intermediate gear is provided between the drive shafts of the paper feed rollers, It is characterized in that the feed roller is provided rotatably around the axis of the intermediate gear. Also,
Both ends of the moving-side paper feed roller are rotatably supported by roller bearing levers, and the roller bearing levers are connected to each other by a connecting member whose central portion has lower strength than both ends, and It swings around an axis concentric with the rotation axis of the gear.

[0013]

According to the above construction, the moving-side paper feed roller and the drive system are directly connected to each other, so that the play in the rotational direction which occurs when a universal joint is used can be eliminated. Further, since the moving side paper feed roller rotates about the same shaft center as the intermediate gear when coming in and out of contact with the fixed side paper feed roller, the meshing gap between the drive shaft of the moving side paper feed roller and the intermediate gear is also constant. Becomes Therefore, during printing, there is no uneven rotation due to a shock when the paper is cut, and the paper can be fed with a smooth and stable tension. In addition, the connecting bar that prevents the roller bearing levers at both ends of the moving-side paper feed roller from moving to the left and right has weakened the strength of the central part. When you do, you will not move to one side.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
It will be explained based on. In the figure, the same parts as those in FIGS. 4 and 5 are designated by the same reference numerals. 30,
Reference numeral 31 denotes a shaft, which is fixed to the frame 1. 32, 33
Is a bearing lever, which is rotatably supported by shafts 30 and 31, respectively. Reference numeral 34 is a connecting bar, which is formed so that its central portion is deformable and connects the bearing levers 32 and 33. 35
Is a drive-side roller shaft, which is rotatably supported by bearing levers 32 and 33 through a bearing 4B, and penetrates the frame 1 so as to be swingable about a shaft 30.

A labyrinth collar 36 is provided between the frame 1 and the roller shaft 35. 37 is an O-ring,
Reference numeral 38 denotes an oil seal, which is provided between the frame 1 and the bearing lever 32, respectively.

A driven gear 39 is fixed to one end of the roller shaft 35. 40 is a driving source gear (shown in FIG. 3),
Power is received from a drive shaft (not shown). Reference numeral 41 denotes a drive gear, which is fixed to the roller shaft 3 so as to mesh with the drive source gear 40. An intermediate gear 42 (shown in FIG. 3) is rotatably supported by a shaft (not shown) fixed to the frame 1 so as to mesh with the drive gear 41. Reference numeral 43 denotes an intermediate gear, which meshes with the driven gear 39 and the intermediate gear 42.
The shaft 30 is rotatably supported.

A hinge pin 44 is fixed to the frame 1. An eccentric bush 45 is rotatably supported by the hinge pin 44. Reference numeral 46 denotes a nut, which is screwed into a screw formed at one end of the hinge pin 44. 22 is an air cylinder, one end of which is rotatably supported by a hinge pin 44 via an eccentric bush 45, and the other end of which is the bearing lever 3
It is rotatably coupled to 2, 33.

With such a structure, the interval between the paper feed rollers 5 and 11 can be adjusted by rotating the eccentric bush 45 and changing the rotational positions of the bearing levers 32 and 33. Further, the contact pressure between the paper feed roller 5 and the paper feed roller 11 can be arbitrarily set by adjusting the pressure of the compressed air supplied to the air cylinder 22.

The operation of the air cylinder 22 causes the bearing levers 32 and 33 to swing, whereby the paper feed roller 1
1 can be moved closer to or away from the paper feed roller 5.
At this time, since the bearing lever 32 swings around the shaft 30, the driven gear 39 that meshes with the intermediate gear 43 also rotates along the intermediate gear 43 without changing the meshing with the intermediate gear 43. Therefore, the shaft center of the roller 11 and the driven gear 39 are not displaced from each other, and it is not necessary to receive a joint between the shaft 10 of the roller 11 and the shaft 35 of the driven gear 39.

[0020]

As described above, according to the present invention, a joint for connecting the moving-side paper feed roller and its drive shaft is not required, and maintenance can be facilitated. Further, it is possible to improve the folding accuracy of the signature by eliminating the uneven rotation of the paper feed roller due to the play in the rotational direction of the joint. Further, it is possible to easily adjust the distance and contact pressure between the fixed side paper feed roller and the movable side paper feed roller.

[Brief description of drawings]

FIG. 1 is a cross-sectional development view showing an embodiment of the present invention.

FIG. 2 is a front explanatory view of the present embodiment.

FIG. 3 is an explanatory diagram for explaining transmission of a driving force according to the present embodiment.

FIG. 4 is a cross-sectional development view of a conventional example.

FIG. 5 is a front explanatory view of a conventional example.

[Explanation of symbols]

 1 frame 2 bearing case 3 roller shaft 4A, 4B, 4C bearing 5 fixed side paper feed roller 6 gear 7 bearing pin 8 bearing lever 9 connecting bar 10 roller shaft 11 moving side paper feed roller 12 coupling flange 13 drive shaft 14 gear 15 Universal joint 16 Shaft 17 Cam roller lever 18 Cam roller 19 Operating lever 20 Cylinder connecting lever 21 Hinge pin 22 Air cylinder 23 Fixed shaft 24 Nut 25 Stopper screw 26 Lock nut 27 Paper 28, 29 Cutter barrel 30, 31 Shaft 32, 33 Bearing lever 34 Connecting bar 35 Drive side roller shaft 36 Labyrinth collar 37 O-ring 38 Oil seal 39 Driven gear 40 Drive source gear 41 Drive gear 42, 43 Intermediate gear 44 Hinge pin 45 Eccentric bush 46 Nut

Claims (2)

[Claims] 1. A fixed-side paper feed roller and a drive shaft of a movable-side paper feed roller that can be moved in and out of contact with the fixed-side paper feed roller are synchronously driven to rotate, and the fixed-side paper feed roller and the moving-side paper feed roller In a paper feeding device of a rotary printing press that nips and feeds paper, an intermediate gear is provided between the drive shafts of the respective paper feeding rollers, and the moving side paper feeding roller is rotatably provided around the axis of the intermediate gear. A paper feeding device characterized in that 2. The sheet feeding roller on the moving side is rotatably supported at both ends by roller bearing levers, and the roller bearing levers are connected to each other by a connecting member having a central portion weaker in strength than the both ends. The paper feeding device according to claim 1, wherein the paper feeding device swings about an axis that is concentric with the rotation axis of the intermediate gear.