JPH0628505Y2 - Paper feeder for sheet-fed printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sheet feeding stacking device for stacking sheets to be fed to a printing unit on a stacking plate of a sheet feeding device in a sheet-fed printing press.

[Conventional technology]

The sheet feeding device of the sheet-fed printing press is equipped with a pair of left and right elevating bars that are hung from the front and rear ends by an elevating chain. Both ends are supported by the left and right elevating bars and arranged in the paper feeding device, and the paper on the paper stack is sucked one by one from the upper one and supplied to the printing unit for printing. At the time of this paper feeding, the sensor detects the upper end of the stacked paper and the signal is used to wind up the elevating chain so that the paper surface height is kept constant irrespective of the weight reduction due to the paper feeding.

[Problems to be solved by the device]

However, in such a conventional paper stacking device, the lifting chain that is intermittently wound up flaps or flutters due to the impact of the winding, which causes unevenness or bending of the stacked sheets, which causes the paper to be fed. However, there is a problem in that the printing becomes unstable and the printing efficiency decreases. Further, when the paper is stacked in the paper feeding device, variations in the paper may occur during the paper stacking work.

[Means for Solving the Problems]

In order to solve such a problem, according to the present invention, a guide column is provided upright in the vicinity of an elevating member, which restricts the elevating member from moving in the left-right direction and allows the elevating member to move in the front-rear direction to guide the elevating. And a pressing means for pressing the front end of the stacked sheets against the vertical front cover, and provided between the vertical frame side of the frame and the elevating member, and resists the pressing means when the elevating member is located below the frame. A cam that moves in the direction and an engagement member that engages with the cam are provided.

[Action]

When the elevating member is lowered to the lower limit, the cam action of the inclined surface of the cam moves the elevating member rearward, so the paper is stacked on the paper stack plate on the elevating member while aligning the front end with the vertical front contact. . When the printing operation is started after the sheets are piled up, the elevating member is raised by winding up the elevating chain and released from the rearward pressing by the cam, so that the pressing means urges the frontward,
The stacked paper sheets are pressed against the vertical front pad via the paper stack plate so that the paper can be continuously fed without fluctuation.

〔Example〕

1 to 3 show an embodiment of a paper feeding and stacking device according to the present invention, FIG. 1 is a side view thereof, FIG. 2 is a plan view of a portion close to one side frame, and FIG. FIG. 3 is a side view of the paper feeding device that has performed FIG. In the figure, the left and right frames 1 formed in an inverted L shape are erected on the sheet feeding device, and the front and rear two positions of the horizontal member of each frame 1, from a total of four positions,
An elevating chain 2 having a hoisting and rewinding mechanism is suspended. Reference numeral 3 denotes a pair of left and right lifting bars formed in the shape of a bar having a rectangular cross section. The lower ends of the lifting chains 2 are fixed to the front and rear two positions on the side of each lifting bar 3, and the lifting chains are operated automatically or by push button operation. The left and right elevating bars 3 are configured to move up and down by winding and unwinding 2. In front of the elevating bar 3, vertical guide columns 4 are fixedly installed on the side surfaces of the left and right frames 1,
A groove 4a is formed on the end surface of the lifting bar 3 on the entire length. Further, a vertical guide column 5 is erected on the rear side of the elevating bar 3 while being supported by the floor surface and the frame 1, and a V-shaped groove 5a is formed on the elevating bar 3 side. . A protrusion 6 is formed on the front end of the elevating bar 3 and slidably engages with the groove 4 a of the guide column 4. An arm 8 is pivotally attached to a bracket 7 fixed to the rear end of the elevating bar 3, and the free end of the arm 8 is engaged with the groove 5a of the guide column 5. The roller 9 is engaged. The other end of a spring shaft 10 pivotally attached to the arm 8 is slidably engaged with a hole of a spring receiver 11 provided upright on the elevating bar 3, and a roller 9 is grooved on the spring shaft 10. A compression coil spring 12 is provided for applying a turning force to the arm 8 in a direction of pressing the arm 5a. That is, the elevating bar 3 is urged by the reaction force of the rollers 9 to be pressed against the groove 5a so as to move forward, and is guided by the guide columns 4 and 5 so as to be movable in the front-rear direction. The movement in the left-right direction is restricted by 5, and the up-and-down movement is guided.

On the other hand, a cam 13 having an inclined surface 13a that is inclined toward the front as it goes upward is fixed to the base end surface of the frame 1 near the left and right lifting bars 3.
The roller 14 pivotally attached to the elevating bar 3 is pressed against the inclined surface 13a by the elastic force of the compression coil spring 12.

Bars 15 are integrally supported at two positions in front of and behind the left and right elevating bars 3, and a paper stacking plate 17 formed in a rectangular plate shape and for stacking paper 16 is placed on the bar 15. There is. A plurality of vertical front pads 18 are provided upright in front of the paper stacking plate 17, and the paper 16 is aligned by stacking the front end of the paper 16 against it. The rear lifting chain 2 is not directly fixed to the lifting bar 3 but is fixed to a chain hook 19 bolted to the lifting bar 3, and the compression coil spring 1
It is configured to avoid interference with the second grade.

The operation of the sheet feeding and stacking device configured as described above will be described. When the lifting chain 3 is rewound and the lifting bar 3 is lowered to the lower limit prior to the printing operation, the rollers 14 move from the lower part of the inclined surface 13a of the cam 13 to the higher part thereof. It is pushed backward and moves against the elastic force of. Then, the paper stacking plate 17 is placed on the bar 15 integrated with the elevating bar 3 and the paper 16 is stacked on the paper stacking plate 17. In this case, the paper stacking plate 17 may be applied to the front pad 18 or may be slightly separated, but the paper 16 is stacked while aligning the paper edges with the front end being in contact with the front pad 18. At the time of loading, the lifting bar 3 is pushed by the cam 13 and the roller 9 that compresses the compression coil spring 12 is pressed against the groove 5a, so that the lifting bar 3 is stable and does not flutter.

After the stacking, when the printing operation is started, the paper 16 is sucked one by one from the upper layer and is supplied to the printing unit for printing. The lifting chain 2 is intermittently wound up as the paper is fed, and the lifting bar 3 rises.
Since 4 is released from the pressure by the high portion of the inclined surface 13a of the cam 13, the elevating bar 3 is urged to move forward by the elastic force of the compression coil spring 12. Therefore, the front end of the integrated paper 16 is pressed against the front pad 18 via the elevating bar 3 and the paper stack plate 17 and is stabilized. In addition, when the paper loading amount is small, the paper stacking plate 17 and the bar 15 slide and the roller 1
4 moves along the inclined surface of the cam 13,
When the bar and the bar 15 do not slip, the roller 14 has the inclined surface 1
Does not touch 3a. Lifting bar 3 goes up further and rolls 1
Even after 4 is separated from the cam 13, the paper 16 is pressed against the front pad 18 by the elastic force of the compression coil spring 12 and the lateral movement of the paper 16 is restricted by the guide columns 4 and 5, so that the paper 16 is stable. And, even if it is suspended by the lifting chain 2, it does not flap.

[Effect of device]

As will be apparent from the above description, according to the present invention, in the sheet feeding device of the sheet-fed printing press, it is erected upright in the vicinity of the elevating member to regulate the lateral movement of the elevating member and move it in the front-back direction. And a guide column that enables and guides its up and down,
A pressing unit that presses the front end of the stacked sheets against the vertical front pad, and is provided between the vertical frame side of the frame and the lifting member,
Since the elevating member is provided below the frame, it is provided with a cam that moves in a direction against the pressing means and an engaging member that engages with this cam. Since the loaded paper is pressed against the vertical front pad by the spring force of the member, the elevating member hung by the lifting chain and the loaded paper on it are not exposed stably, so that the paper is bent or scattered. There is nothing to do. For this reason, stable paper feeding is performed from a fixed position, and there is no stoppage of the machine due to poor paper feeding, so that printing efficiency is improved and the amount of waste paper is reduced.

[Brief description of drawings]

1 to 3 show an embodiment of a sheet stacking device of a sheet-fed printing press according to the present invention, FIG. 1 is a sectional view thereof, and FIG. 2 is a plan view of a portion adjacent to one side frame. FIG. 3 is a side view of a paper feeding device embodying the present invention. 1 ... Frame, 2 ... Lifting chain, 3 ... Lifting bar, 4,
5 ... Guide stanchions, 4a, 5a ... Grooves, 6 ... Protrusions, 9 ... Rollers, 12 ... Compression coil springs, 13 ... Cams, 13a ... Inclined surfaces, 14 ... Rollers, 16 ... Paper, 17 ... Paper stack plates, 18 ... Front support.

Claims (1)

[Scope of utility model registration request] 1. A frame provided with a vertical frame, an elevating member which is adjacent to the vertical frame by an elevating chain suspended from the frame, and which elevates and descends along the vertical frame, and a paper placed on the elevating member. In a sheet-feeding paper stacking apparatus of a sheet-fed printing press including a paper stacking plate on which sheets are stacked and a vertical front pad provided in front of the paper stacking plate, an elevating member standing upright in the vicinity of the elevating member. Of the vertical frame of the frame, a guide column for restricting the movement of the sheet in the left-right direction and allowing the movement in the front-rear direction to guide the elevation thereof, pressing means for pressing the front end of the stack of sheets against the vertical front pad. A cam that is provided between the side and the elevating member and that moves when the elevating member is located below the frame in a direction that opposes the pressing means, and an engaging member that engages with the cam. Characteristic sheet Paper feeding paper product unit of the printing machine.