JPH11310345A - Sheet feeder for paper sheet printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly and stably transfer various sheets onto a feeder board, to greatly reduce the loosening of the sheets, to dispense with the a series of devices for adjusting a guide in the side width direction of the sheets, to simplify a structure and to reduce manufacturing costs. SOLUTION: This sheet feeder for a paper sheet printer is constructed in such a manner that a gap is formed in the upper side of stacked sheets, a pair of winding rollers 6a and 6b are positioned in the upstream and downstream sides of bite rollers 5a and 5b provided in the entrance of a feeder board and hung in a sheet side width direction, sheet guides 4 formed to be wider in the downstream side are wound on both end parts of the winding rollers 6a and 6b, and by the winding/unwinding of the winding rollers 6a and 6b, the set width of the sheet side width direction of each sheet guide 4 and the set length of a sheet transfer direction are changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device for a sheet-fed printing press provided with a sheet-like guide for stabilizing the running posture of sheets fed one by one.

[0002]

2. Description of the Related Art FIGS. 5 and 6 are schematic views of a general paper feeder provided in a sheet-fed printing press, and FIG. 7 is an explanatory view of a problem of the paper feeder. General sheet-fed printing presses
5 and 6, a plurality of sets of printing devices (not shown) for performing multicolor printing, a paper discharging device (not shown), a sheet stacking device provided in the paper discharging device, and the like. In such sheet-fed printing presses, sheets (sheets)
Reference numeral 2 denotes a sheet which is sent out one by one from the sheet feeding device P, undergoes predetermined printing on the way to a printing device in the next process, and is subsequently transferred to a sheet discharging device. And is carried out to the outside as a fixed number of bundles.

As shown in FIGS. 5 and 6, a conventional sheet feeding device P includes a sheet feeding table 1, on which sheets 2 to be stacked are placed, a separating device 11, a sheet feeding device 12, and the like. The feeder board 3 for transferring the sheet 2 from the paper feeding device P to a first printing device (not shown) is provided with a biting roller 5 and a feeder belt conveyor 13 from the upstream end to the downstream end. Front patch 1 at downstream end
4 are equipped.

[0004] The sheet feed table 1 has a stack of sheets 2
And is controlled so as to always set the height position of the stacked uppermost sheet 2 to a height suitable for unloading. In addition, the above-mentioned judgment device 11
Functions to prevent a feeding error such as feeding two sheets by blowing air A from the upper rear end of the stacked sheets 2 to separate them one by one. The sheet feeding device 12 has a plurality of vacuum suction pads 15 provided below, and only one uppermost sheet 2 separated by the separation device 11 is suction-held by the vacuum suction pad 15. While being moved in this state, the feeder board 3 is configured to be inserted between the biting roller 5 and the feed roller 16.

The biting roller 5 has a feed roller 16 fixedly provided below the sheet path line.
The sheet 2 is configured to contact and separate from the sheet 2 in synchronization with the feeding timing of the sheet 2 to be fed. It functions to transfer onto the belt conveyor 13. Further, the feeder belt conveyor 13 includes a plurality of guide rollers 17.
Are endless belt conveyors wound around each other, and a motor M connected to a partial shaft end of the guide roller 17 is provided.
, The travel speed can be arbitrarily set to increase or decrease (corresponding to the machine speed).
The front pad 14 defines a stop position of the front end of the sheet 2 fed at the downstream end of the feeder board 3 and transfers it to a claw of a first intermediate cylinder provided at a printing apparatus entrance (not shown) in the next process. It is functioning.

With the above configuration, the sheet 2 is sucked at the rear (rear end) side by the vacuum suction pad 15 of the sheet feeding device 12 and sent out, and then bites with the feed roller 16 from the sheet feeding table 1. It is delivered to the middle of the roller 5 and further to the feeder conveyor 13, and is fed out along the upper surface of the feeder board 3 until it comes into contact with the front pad 14.

[0007]

However, the above-mentioned conventional sheet feeding device P has the following problems.
That is, the sheet 2 sucked and held by the vacuum suction pad 15 bends upward while being transferred to the biting roller 5 and the feeder roller 16, and is gripped by the biting roller 5 due to a change in the amount of bending. In some cases, the position to be moved fluctuates back and forth in the operation side and the drive side, that is, in the width direction of the apparatus (seat). Therefore, as shown in FIG. 7A, the sheet 2 moves on the feeder board 3 in an inclined state, and only one front end of the preceding sheet 2 comes into contact with the front pad 14. Such bending of the seat 2 often occurs mainly due to a slight difference in the air volume and wind pressure balance between the operation side and the drive side of the auxiliary blowing air. As described above, in the conventional sheet feeding device P, since the sheet 2 flows on the feeder board 3 in an inclined state, the sheet transfer to the next process becomes unstable, and it is difficult to perform registration in downstream printing, resulting in poor accuracy. Was a major factor in the occurrence.

Various means have been proposed as means for restricting the deflection of the sheet 2 today. In the sheet feeder illustrated in FIG. 5, the sheet feeder 12 feeds a sheet processing machine (feeder board) above the sheet pile.
A plurality of (about five) rod-shaped guides 18a to 18n are arranged on the feeder roller 16 before the transfer position to the transfer position 3 is reached. Further, in the sheet feeding device illustrated in FIG. 6, a sheet feeding member 19 is provided instead of the rod guide 18. The sheet feeding member 19 includes a pair of take-up rollers 20 configured to be movable and adjustable at both front and rear ends in the sheet transport direction in the sheet width direction.
a, 20b, and is always stretched while applying a predetermined tension. The present apparatus can cope with various sheets 2 having different widths by moving one side (downstream side) of the pair of winding rollers 20 a and 20 b in the apparatus width direction, and the winding amount of the sheet feeding member 19. By changing the distance between the axes of the take-up rollers 20a and 20b, it is possible to cope with various sheets 2 having different lengths in the transport direction (Japanese Patent Application Laid-Open No. 9-1997).
124181).

Next, problems of the sheet feeding device will be described. As shown in FIG. 7, inconveniences common to FIGS. 5 and 6 include a sheet 2 having low rigidity such as thin paper, a gap between a separator (sheet transfer device) and a guide,
Deflection of the sheet 2 occurs between the guides, and as a result, the flow of the sheet 2 becomes unstable, and there is a possibility that sheet feeding failure occurs. Further, the apparatus shown in FIG. 6 requires a mechanism for moving and setting the take-up roller 20 in the sheet width direction. Further, when the sheet feeding member 19 is formed in a wide belt shape, the take-up roller to be wound is used. It is necessary to incorporate 20 shaft angle adjustment mechanisms. For this reason, the structure of the sheet feeding device becomes complicated, and not only initial setting is difficult, but also the production cost increases.

The present invention has been made in view of such circumstances, and an object thereof is to appropriately and stably transfer various sheets to be fed onto a feeder board, and to greatly reduce sheet deflection. It is another object of the present invention to provide a sheet feeding device for a sheet-fed printing press, which does not require a series of devices for adjusting a guide in the width direction of a sheet, has a simple structure, and can reduce manufacturing costs.

[0011]

In order to solve the problems of the prior art, according to the present invention, a gap roller is provided above a stacked sheet, and a biting roller provided at an inlet of a feeder board is provided. A pair of take-up rollers, which are positioned on the upstream side and the downstream side of the sheet in the width direction of the sheet, and a sheet-like guide formed so that the downstream side is widened at both ends of the take-up roller. The guide is configured to be able to change the set width of the guide in the sheet width direction and the set length of the guide in the sheet transfer direction by winding and unwinding the winding roller.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. Here, FIGS. 1 and 2 are explanatory views of the configuration of a sheet guide (paper guide) provided in a sheet feeding device of a sheet-fed printing press according to an embodiment of the present invention, and FIG. 2 is a side view thereof. FIG.
FIG. 4 is a diagram illustrating the function of a sheet guide. A feature of the embodiment of the present invention resides in a sheet guide 4 provided in a sheet feeding device P of a sheet-fed printing press as shown in FIGS. 1 and 2, and the sheet guide 4 is provided on a sheet feeding table 1. The sheet 2 sent out one by one from the top of the stack of stacked sheets 2 is provided so as to be stably transferred onto the feeder board 3 on the downstream side.

That is, as shown in FIGS. 1 and 2, the basic configuration of the sheet feeding device P is that a biting roller (biting roller) 5 is provided at an entrance of the feeder board 3 and the biting roller 5 is provided. Equipment (sheets) located on both the upstream and downstream sides of the
A pair of take-up rollers 6a, 6b spanned in the width direction
Are arranged, and these take-up rollers 6a, 6b
A sheet guide 4, which is a sheet-like paper guide, is wound and stretched between them. The biting roller 5 is composed of a pair of rollers 5a and 5b opposed to each other with an interval in the lateral direction of the apparatus.

The sheet guide 4 is provided with a biting roller 5
a, 5b, the left and right and center 3 along the device width direction.
The sheet is divided into sheets 4a, 4b, and 4c, and the sheet guide 4b located at the center is formed of one (or a plurality of) sheets having the same width. On the other hand, the sheet guides 4a and 4c located on both sides in the width direction of the apparatus are formed of substantially triangular sheets each having a predetermined gradient on the outside so that the downstream side is widened. Therefore, as shown in FIGS. 3A and 3B, the set width of the sheet guide 4 in the sheet width direction and the set length of the sheet guide in the sheet transfer direction are set by the sheet guide 4 via both take-up rollers 6a and 6b. It is possible to change and set by appropriately feeding or winding.

These winding rollers 6a and 6b can be rotated manually, but are rotated by motors 7a and 7b and a control device 8 connected to the respective shaft ends as shown in FIG. It is also possible. In this method, the motors 7a and 7b are connected to the control device 8, and the motors 7a and 7b correspond to the specifications of the sheet 2 to be fed through the sheet width direction dimension data input to the control device 8. It is controlled automatically. Therefore, the width and the length in the vertical direction of the sheet guide 4 are configured to be automatically set by the rotational driving of the motors 7a and 7b. Note that the control device 8 receives a measurement value actually measured by a pair of sensors 9 for detecting the width of the sheet 2 or inputs a value based on sheet size data set in advance.
There are various input formats. The pair of sensors 9 are disposed in front of the sheet transport direction and at intervals in the width direction.

On the other hand, in addition to the basic structure of the sheet guide 4, as shown in FIGS. 4 (a) and 4 (b), the shaft ends of the take-up rollers 6a and 6b are respectively raised and lowered by a lifting device 10a and a lifting device 10a.
The structure supported by 10b may be used. According to such a structure, as shown in FIG. 4A, it is possible to appropriately set the vertical gap H between the uppermost stage of the stacked sheets 2 and the sheet guide 4. Further, if the relative lifting amount of the lifting devices 10a and 10b is changed, as shown in FIG. 4B, the gradient angle θ is changed from the upstream to the downstream with respect to the uppermost sheet surface of the stacked sheets 2. It can be set as the formed sheet guide 4. Furthermore, sheet guide 4
Can be arbitrarily adjusted by changing the torque of both winding rollers 6a and 6b, and a sheet material (for example, a metal sheet) having a static elimination effect to suppress the generation of static electricity as the sheet guide 4. , A carbon fiber sheet or the like may be grounded).

As described above, in the sheet feeding device P of the sheet-fed printing press according to the present embodiment, the sheet guide 4 configured as described above is used.
a, 4b and 4c, a pair of take-up rollers 6 arranged in parallel on the upstream side and the downstream side in the traveling direction of the sheet 2.
By appropriately adjusting the winding amount or the feeding amount of the sheet guide 4 in steps a and 6b, the width of the sheet guide 4 and the length in the sheet advancing direction can be made to correspond to the sheet 2 to be transferred. In addition, the gap and angle between the sheet 2 to be transferred and the sheet guide 4 can be appropriately changed and set according to sheet specifications. Therefore, the upper side of the sheet 2 to be transferred can be restricted by a plane having a large area, and the sheet 2 can be stably run in accordance with its quality (rigidity). Can be.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes may be made without departing from the scope of the present invention. What you get.

[0019]

As described above, the sheet feeding device of the sheet-fed printing press according to the present invention has a gap above the stacked sheets, and is located upstream of the biting roller provided at the entrance of the feeder board. 1 that is located on the downstream side and spans the sheet in the width direction
A pair of take-up rollers is provided, and a sheet-like guide formed so that the downstream side is widened at both end portions of the take-up roller is wound, and the sheet of the guide is wound by taking up and feeding out the take-up roller. Since the configuration is such that the set width in the width direction and the set length in the sheet transfer direction can be changed, the following various effects can be obtained. (1) Since most of the sheet is guided on a flat surface by the sheet-shaped guide, the deflection of the sheet is greatly reduced, and the unevenness and inclination of the sheet front end are eliminated, so that various sheets can be appropriately and stably placed. Can be transported. (2) By forming the sheet-shaped guide with a material having a static elimination function, problems such as adsorption by static electricity can be eliminated, and defective feeding can be suppressed. (3) Various specifications (rigidity, properties) because the gap between the sheet to be fed and the lower surface of the sheet-shaped guide and the angle between the sheet surface and the sheet-shaped guide can be changed.
Can be appropriately transferred. (4) Form the sheet guide into a substantially triangular sheet shape,
Since the effective area of the sheet-shaped guide can be changed only by winding or rewinding (unwinding) by the winding roller, a series of devices for adjusting the guide in the width direction of the sheet is not required, and the structure is simplified. In addition, manufacturing costs can be reduced. (5) The initial setting work related to the item (4) is facilitated, and labor can be saved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a sheet guide provided in a sheet feeding device of a sheet-fed printing press according to an embodiment of the present invention.

FIG. 2 is a side view showing the sheet guide of FIG. 1;

3 (a) is a plan view showing a state before the length of the sheet guide in the sheet traveling direction is changed, and FIG. 3 (b) is a plan view showing a state of the sheet guide in FIG. It is a top view showing the state after changing the length in the direction of movement.

FIG. 4 is a side view showing a state in which a take-up roller of a sheet guide of the present embodiment is supported by an elevating device, and FIG. 4 (a) shows a state in which a gap between the uppermost stage of stacked sheets and the sheet guide is set; (B) is a side view showing a state where a gradient is formed from the upstream side to the downstream side with respect to the stacked uppermost sheet surface.

FIG. 5 is a side view showing a sheet feeding device of a conventional sheet-fed printing press provided with a bar-shaped guide.

FIG. 6A is a side view showing a sheet feeder of a conventional sheet-fed printing press provided with a sheet feeding member, and FIG. 6B is a view taken in the direction of arrow A in FIG.

FIG. 7A is a plan view showing a state in which a sheet is skewed on a feeder board in a conventional sheet feeding device;
FIG. 4B is a front view illustrating a state in which the sheet is guided by the sheet feeding member.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet feed table 2 sheet 3 feeder board 4 sheet guide 5 biting roller 6 take-up roller 7 motor 8 control device 9 sensor 10 elevating device 11 separating device 12 sheet feeding device 13 feeder belt conveyor 14 front support 15 vacuum suction pad 16 feeder Roller 17 Guide roller P Paper feeder

Claims (3)

[Claims] 1. A gap is provided above the stacked sheets,
A pair of take-up rollers, which are positioned upstream and downstream of the biting roller provided at the entrance of the feeder board and are stretched across the sheet in the width direction of the sheet, are disposed. A sheet-shaped guide formed so as to have a wider side is wound, and the set width of the guide in the sheet width direction and the set length of the guide in the sheet transfer direction can be changed by winding and unwinding of the winding roller. A sheet feeding device for a sheet-fed printing press. 2. A motor is connected to a shaft end of a take-up roller around which the sheet-shaped guide is wound, and the motor is controlled through sheet width direction dimension data input to a control device to drive the motor. 2. The sheet feeding device of a sheet-fed printing press according to claim 1, wherein the guide is configured to automatically set the width and length in the vertical direction. 3. A take-up roller shaft end around which the sheet-shaped guide is wound is supported by an elevating device, and a gap between the guide and the stacked sheet upper surface and a gradient angle with respect to the sheet upper surface are set. The sheet feeding device for a sheet-fed printing press according to claim 1, wherein the sheet feeding device is configured to be changeable.