JP2914959B1 - Sheet feeder in printing equipment - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To properly feed a rectangular sheet periodically between a rotating body for sheet printing and a rotating body for sheet backup by a butt pushing pusher provided in a bar provided between endless belts to perform the same printing. Perform proper printing with the rotating body. A pair of endless belts are hung on both sides in the axial direction of a rotary member for sheet backup so as to rotate with the rotary member, respectively, and the rectangular shape is mounted on a bar provided between the endless belts. A pusher 12 for pushing the trailing edge of the sheet 3 between the two rotating bodies 1 and 2 is provided.
A relief portion 1 extending in the axial direction for receiving the bar 11
3 is provided, and the bar 11 is shifted to the sheet exit side while being received by the escape portion 13 at the sheet entrance side, and the pusher 12 pushes the rear end of the square sheet 3 during this transition. apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus for printing by feeding a cut rectangular sheet between a rotating body for sheet printing and a rotating body for sheet backup.

[0002]

2. Description of the Related Art In a printing apparatus in which a cut rectangular sheet is fed between a rotary body for sheet printing and a rotary body for sheet backup and printed, a device for supplying a sheet between the rotary bodies is indispensable. . Conventionally, as the sheet feeding device, a device for performing printing while holding the front edge of the sheet with a gripper and pulling it toward the sheet exit side, or hanging a perforated belt on the rotating member for sheet backup, and installing the rotating member for sheet backup in the rotating member for sheet backup 2. Description of the Related Art An apparatus has been put into practical use in which a rectangular sheet is transported by a built-in vacuum apparatus through a hole in a perforated belt while being sucked onto the surface of the belt and printed.

[0003]

However, in the former feeding device using the sheet gripper, the synchronous structure between the sheet pulling operation by the gripper and the rotation operation of the two rotating bodies becomes complicated, and there is a possibility of a printing error. In addition, there is a disadvantage that printing cannot be performed on the sheet portion gripped by the gripper and the printing area is limited.

In the latter method using a perforated belt, nip pressure failure occurs at a sheet portion adsorbed in a large number of holes, and poor printing or printing cannot be performed on the perforated surface of the perforated belt at the same portion. Has a problem with limitation.

[0005]

Means for Solving the Problems Printing is performed on the surface of a square sheet by feeding a square sheet between a rotating body for sheet printing that rotates on a fixed axis and a rotating body for sheet backup rotating on a fixed axis and rotating both rotating bodies relatively. In the printing apparatus described above, a pair of pulleys that rotate following the sheet backup rotator are provided on both sides in the axial direction of the sheet backup rotator, and each pulley is provided with a pair of endless belts that rotate with each pulley. A butt pushing pusher that pushes the trailing edge of the rectangular sheet and feeds it between the rotating bodies is provided on a bar that is laid on the bar between the endless belts.

[0006] On the other hand, the sheet back-up rotator is provided with an escape portion extending in the axial direction for receiving the bar, and the bar is moved toward the sheet entrance side with the rotation of the rotators and the rotation of the endless belts. The sheet is shifted to the sheet exit side while being received by the escape portion, and during this shift, the rear end of the square sheet is pushed by the pusher.

The bar projects beyond the sheet conveying surface.

A plurality of the bars are provided laterally at intervals between the endless belts, and each bar is provided with a pusher for pushing the buttocks.

The endless belt is formed by a toothed belt, and has a mounting structure in which both ends of the bar are engaged with the teeth of the toothed belt.

A plurality of the pushers are attached to the bar, and each pusher is moved in the longitudinal direction of the bar so that the attachment position can be changed. Furthermore, the endless belt is hung on the upper arc surface including the top dead center of the pulley, and the entrance side conveyance guide plate that guides conveyance between the two rotating bodies by the pusher while receiving the sheet at the sheet entrance side. And an exit-side guide plate that guides conveyance while receiving the sheet pushed by the pusher on the sheet exit side.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a rotating body for sheet printing which rotates by a fixed axis, 2 denotes a rotating body for sheet backup which rotates by a fixed axis, and both 1 and 2 are vertically arranged so as to rotate relative to each other.

The rectangular sheet 3 is periodically fed between the two rotating bodies 1 and 2 and is printed on the surface of the sheet 3 by applying a nip pressure while passing between the two rotating bodies 1 and 2 from the entrance side to the exit side. Is applied.

The rotating body 1 for sheet printing is a printing apparatus having a plurality of printing units 4 arranged at equal intervals on a concentric circle. The printing unit 4 has a plurality of printing wheels 5 arranged coaxially side by side, having a plate of numbers and symbols provided on the peripheral surface of each printing wheel 5, and fixing each of the character wheels 5 with an annular cam groove 6 '. It is a structure in which digit and symbol shift can be performed by intermittent rotation by the cam 6, and when each square sheet 3 is supplied between the two rotating bodies 1 and 2, the required ring is intermittently rotated to form a square. It has a function of printing numbers and codes on the sheet 3.

By performing the digit feed of the printer 4 every time the square sheet 3 is supplied, a serial number or a continuous symbol can be printed on each sheet 3.

Further, the rotating body 1 for sheet printing can be used as a printing cylinder in offset printing. Alternatively, the rotating body 1 for sheet printing may be a plate cylinder having a printing plate on a peripheral surface.

A pair of main guide pulleys 7 are provided on both sides in the axial direction of the rotary member 2 for sheet backup.
The main guide pulley 7 is provided on a coaxial or parallel axis with the sheet backup rotator 2 and rotates following the rotator 2.

A pair of endless belts 8 are wound around the upper arc surface including the top dead center of each of the main guide pulleys 7.

The endless belts 8 are suspended via the guide pulley 9 and the drive pulley 10 so as to surround the rotator 2 for sheet backup, and follow the rotation of the rotator 2 for sheet backup and the main guide pulley 7. And run from the sheet entrance side to the exit side.

A bar 11 is provided laterally between the endless belts 8. The bar 11 extends parallel to the axes of the rotating bodies 1 and 2.

The bar 11 is provided with a pusher 12 for pushing the trailing edge of the rectangular sheet 3 and sending it between the rotating bodies 1 and 2. A plurality of bars 11 provided with the butt pushing pushers 12 are provided at equal intervals in the running direction of the endless belt 8.

On the other hand, a bar relief portion 13 for receiving the bar 11 is provided in the rotary member 2 for sheet backup. The clearance 13 extends in the axial direction of the seat backup rotator 2, and is opened at the peripheral surface and both ends of the rotator 2.

The bar 11 is rotated by the endless belts 8 following the rotation of the rotating bodies 1 and 2 and the main guide pulley 7, and the escape section 1 is provided at the sheet entrance side.
The sheet 3 is moved to the sheet exit side while being received, and during this transition, the buttocks pusher 12 pushes the buttocks of the rectangular sheet 3 and feeds it between the rotating bodies 1 and 2.

Guide pulley 9 and drive pulley 1
A bar relief portion 14 similar to that of the main guide pulley 7 is provided on each of the peripheral surfaces 0.

When the bar 11 rotates together with the endless belt 8, the guide pulley 9 and the driving pulley 1
0 while being received by the escape portion 14 of each of the pulleys 9, 1
Pass through zero.

The both ends of the bar 11 are attached to the lower surfaces of the endless belts 8 so that the bar 11 is accommodated in the bar escape portion 13 below the sheet conveying surface while the space between the rotary bodies 1 and 2 is on the entrance side. To the outlet side to prevent the sheet printing rotator 1 from interfering with the printer 4.

On the other hand, the tail pusher 12 protrudes beyond the conveying surface of the sheet 3 and passes through the sheet printing rotary body 1 from the entrance side to the exit side. For example, the pusher 12 for pushing the buttocks passes from both sides of the rotating body 1 for sheet printing, or moves from the sheet entrance side to the exit side while being received in an axially extending escape groove formed in the rotating body 1 for sheet printing. Let it pass.

As the endless belt 8, a toothed belt having rectangular teeth on its inner surface is used, and both ends of the bar 11 are fitted and attached to the teeth 15 of the toothed belt.

As a specific example, both ends of the bar 11 are filled on the inner surface of the toothed belt, and the teeth 16 formed on both ends of the bar 11 are meshed with the teeth 15 formed on the inner surface of the belt 8, and The upper surface of the holding plate 8 is filled with a holding plate 17, and both ends of the holding plate 17 are fastened to both ends of the bar 11 by screws 18, and the belt 8 is firmly held between both ends of the bar 11 and the holding plate 17.

The pusher 12 for pushing the buttocks is a rotating body 1
A plurality of pushers 12 are provided at intervals in the direction of the axis 2, and each pusher 12 is moved in the longitudinal direction of the bar 11, that is, the direction of the axis of the rotating bodies 1 and 2 to change the mounting position.

As a specific example, an elongated hole 19 having a bottom extending in the longitudinal direction is provided on the upper surface of the bar 11, and mounting holes 20 penetrating the bar 11 are formed on the inner bottom surface of the elongated hole 19 at regular intervals along the elongated hole. A plurality of guides 21 are provided on the other end of the pusher 12 for pushing the buttocks, and the pusher 1
2 is moved along the elongated hole 19 while sliding the guide portion 21, and the mounting hole 20 is selected and fixed by the screw 22. Therefore, it is possible to cope with the size change of the square sheet 3.

The buttocks pusher 12 comprises a mounting seat 23 and a sheet pressing portion 24 which rises from a front edge of the mounting seat 23. The guide portion 21 projects from the lower surface of the mounting seat 23 to form the elongated hole. 19, the mounting seat 23 is provided with a mounting hole 25 passing through the guide portion 21. The mounting hole 25 is connected to the mounting hole 20.
, And the distance between the pushers 12 is adjusted by fastening with the screws 22.

The means for adjusting the distance between the pushers 12 is not restricted to the above example. For example, a structure is provided in which a long hole penetrating the bar 11 is simply provided in the longitudinal direction of the bar 11 without providing the mounting hole 20, and the pusher 12 is fixed at a predetermined position while moving along the long hole. Is also good.

Alternatively, without providing a long hole in the bar 11, only the mounting holes 20 are provided at intervals, one of the mounting holes 20 is selected and the pusher 12 is fixed, and the interval between the pushers 12 is adjusted. It can be carried out.

The rectangular sheet 3 is formed on an entrance side conveyance guide plate 26 extending toward the sheet entrance side of the rotary bodies 1 and 2.
While being received, the sheet is guided toward the entrances of the two rotating bodies 1 and 2, and the rectangular sheet 3 is pushed backward by the trailing pusher 12 from just before the sheet entrance, so that the rectangular sheet 3 is moved between the two rotating bodies 1 and 2. Pushed into.

On the sheet exit side, there is provided an exit side conveyance guide plate 27 for receiving the sheet 3 which is pushed backward by the trailing pusher 12 and pushed out toward the exit side.

When the rectangular sheet 3 passes through both the rotating bodies 1 and 2, a predetermined printing is performed on its surface.

The square sheet 3 is a banknote as a representative example, and the sheet feeding device in the printing apparatus is suitably used as a device for assigning a serial number to each banknote.

[0039]

[0040]

According to the present invention, the rectangular sheet is periodically fed between the rotating body for sheet printing and the rotating body for sheet backup by the pusher for pushing the buttocks provided on the bar provided between the endless belts. Can be performed properly.

That is, the rear end pusher has a structure in which the trailing edge of the rectangular sheet is pushed and fed between the rotating bodies while moving with the both endless belts. It is possible to appropriately solve the problems in a device that grips the sheet and pulls it out to the sheet exit side, or a device that transfers a sheet to the sheet exit side by providing a sheet back-up rotating body with a perforated belt for sheet adsorption.

That is, the degree of freedom of printing is increased without the restriction of the printing position on the square sheet as in the case of the gripping nail system or the perforated belt system.

The bar moves from the sheet entrance side to the exit side of the two rotating bodies while being received by the escape portion provided in the sheet backup rotating body, so that the bar moves between the sheet and the printing surface of the sheet printing rotating body. It is possible to pass between the two rotating bodies without interference, so that printing on each square sheet is performed without any trouble.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sheet feeding device in a printing apparatus.

FIG. 2 is a side view of a sheet feeding device in the printing apparatus.

FIG. 3 is a plan view in FIG. 2;

FIG. 4 is a sectional view in FIG. 2;

FIG. 5 is an enlarged cross-sectional view of a mounting portion of a bar and an endless belt in the sheet feeding device.

FIG. 6 is an enlarged sectional view of a mounting portion of a bar and a pusher for pushing the buttocks in the sheet feeding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating body for sheet printing 2 Rotating body for sheet backup 3 Square sheet 4 Printing device 5 Printing wheel 6 Cam 7 Main guide pulley 8 Endless belt 9 Guide pulley 10 Drive pulley 11 Bar 12 Pusher for buttocks 13 Bar escape 14 Bar escape Part 15 teeth 16 teeth 17 holding plate 18 screw 19 long hole 20 mounting hole 21 guide part 22 screw 23 mounting seat 24 sheet pressing part 25 mounting hole 26 transport guide plate 27 transport guide plate

Claims (2)

(57) [Claims] 1. A printing method in which a rectangular sheet is fed between a rotating body for sheet printing that rotates on a fixed axis and a rotating body for sheet backup rotating on a fixed axis, and both rotating bodies are relatively rotated to perform printing on the surface of the rectangular sheet. In the apparatus, a pair of pulleys that rotate following the sheet backup rotator are provided on both sides of the sheet backup rotator in the axial direction,
A pair of endless belts running around with the rotation of the pulleys are respectively hung on the respective pulleys, and the rear edges of the rectangular sheet are pushed rearwardly on a plurality of bars horizontally disposed between the both endless belts, thereby performing the two rotations. A plurality of buttocks pushing pushers protruding beyond the conveying surface of the sheet to be fed between the bodies are provided, while the sheet backup rotating body is provided with an escape portion extending in the axial direction for receiving the bar, and the both rotating bodies are provided. With the rotation and the rotation of both endless belts, the bar is shifted to the sheet outlet side while being received by the relief portion at the sheet inlet side, and the pusher pushes the buttocks of the square sheet during this shift, and It has means for moving each pusher in the longitudinal direction of the bar to change the mounting position, and further moves the endless belt to the top of the pulley. And an entrance side conveyance guide plate for guiding conveyance between the rotating bodies by the pusher while receiving the sheet at the sheet entrance side, and pushing the sheet at the sheet exit side by the pusher. And an exit guide plate for guiding the conveyance while receiving the sheet. 2. A sheet feeding device according to claim 1, wherein said endless belt comprises a toothed belt, and both ends of said bar have a mounting structure engaged with teeth of said toothed belt. .