JPS6058138B2 - Paper feeding device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a paper feeding device.

Conventionally, in a paper feeder that has a paper feed tray that can load multiple sheets, when setting paper of a different size, it is necessary to remove the previously set paper, and then restore the paper to the original size. Sometimes, you have to rearrange and set the stack of paper that has been aligned, which is a very tedious task. Since a plurality of devices are provided, the device itself has the drawback of being very expensive. This invention eliminates the drawbacks of the conventional ones and eliminates the hassle of replacing paper by making it easy to replace paper by using multiple removable paper feed trays. It is an object of the present invention to provide a paper feeding device that requires only one paper feeding device. The present invention will be described below based on embodiments shown in the drawings.

1, 2, 3, and 4 show a paper feeding device according to the present invention, in which a pair of guide members 2 are provided in a machine frame 1 provided on the paper feeding port side of a printing press main body (not shown). The guide members 2 are fixed vertically facing each other at intervals, and a longitudinal guide groove 2a is formed on the opposing surface of the guide member 2.

Between the guide members 2, there is a lifting platform 4, with guide rollers 3 provided on both sides thereof positioned in the guide grooves 2a.
It is provided so as to be movable up and down between the upper sheet feeding position shown by c and the lower standby position shown by d. This lifting table 4 is fixed to a chain 6 that is moved by a pair of sprockets 5 provided on the printing press body, so that it can be raised and lowered along the guide member 2. . Horizontal upper pins 7 and lower pins 10 are provided on both sides of the lifting platform 4 opposite to the side fixed to the chain 6, each facing outward.

Hooks 9 provided above both sides 11 of a main paper feed tray 23 having rolling rollers 8 are removably engaged with the upper pin 7, and hooks 9 provided on both sides 11 of the main paper feed tray 23 having rolling rollers 8 are releasably engaged with the lower pin 10. In order to hold the upper surface of the paper in a horizontal state perpendicular to the guide member 2, stoppers 11a provided below both sides 11 of the main paper feed table 23 are brought into contact with each other. Furthermore, a standby stand 12 is fixed to the guide member 2 between the upper sheet feeding position and the lower standby position of the elevating table 4 and extends in the horizontal direction at right angles thereto. The hook 9 for the lifting platform 4
is located on the ascending and descending path of the upper pin of the lifting platform 4 and can be engaged, and the stopper 11a moves between an approach position in which it abuts the lower pin 10 and a separated position horizontally separated from this approach position. It is designed to be placed via moving rollers 8.

The standby table 12 has actuating parts protruding from its top surface, and a first switch 13 detects when the main paper feed table 23 approaches the elevating table 4;
A second switch 14 is provided to detect when the elevator 3 is at a position away from the elevator platform 4. Furthermore, a pair of side plates 15 are provided above the guide member 2 with a distance corresponding to the width of the paper placed on the main paper feed tray 23.

On both sides of the lifting table 4, an upper pin 16 and a lower pin 17 are provided inward in the horizontal direction at positions on the pins 7 and 10 side, respectively.

Hooks 19 provided above both sides 18 of the sub-sheet feed tray 22 are removably engaged with the upper pin 16.
In addition, the lower pin 17 has a guide member 2 that connects the upper surface of the sub-sheet feed table 22.
Stoppers 18a provided below both sides 18 of the sub-sheet feed table 22 are brought into contact with the sub-sheet feed table 22 in order to hold it in a horizontal state at right angles to the horizontal position. The sub-sheet feed table 22 is provided with a pair of side plates 20 having an interval corresponding to the width of the sheet placed thereon. Next, the operation of the above will be explained.

When a printing signal is input to the printing machine, a drive source (not shown) rotates the sprocket 5 and moves the chain 6.
The lifting platform 4 fixed to this chain 6 is a guide member 2
The robot moves up and down between a and d shown in FIG.

At this time, if the main paper feed stand 23 is attached to the elevating table 4, the elevating table 4 will move up and down between a and c. When the sheets have been raised to this position, they are regulated on both sides by side plates 15, and are sequentially carried into the printing press by sheet feed rollers 21, starting from the highest sheet. When changing the paper, as shown in Fig. 5, press the selection switch provided on the setting device (not shown) on the
2 side and turn on the changeover switch, the lifting platform 4 will move from a to c.
It descends from the paper feeding position of the main paper feeding table 23 in between to the standby position d and stops there.

During this lowering operation, the main paper feed table 23 does not descend any further at position c in order for the rolling rollers 8 provided thereon to reach the standby table 12, and only the elevating table 4 is lowered to connect the hook 9 and the upper pin. 7 is disengaged. According to the above,
When the main paper feed tray 23, which is rotatably placed on the standby table 12, is pulled out away from the guide member 2, the second switch 14 is activated, and the main paper feed tray 23 is separated from the elevator platform 4. Detects the position and position. As a result of this detection, the elevating table 4 rises to position b and stops, waiting for the attachment of the sub-sheet feeding table 22. However, as described above, the main sheet feeding table 23 is at the separated position, and the elevating table 4 stops. Since the hook 9 of the main paper feed tray 23 is not located on the ascending and descending path of the upper pin 7 of No. 4, the upper pin 7 and the hook 9 do not engage with each other. After that, hold the sub-sheet feed table 22 by hand, engage the hook 19 with the upper pin 16 of the lifting table 4 stopped at position b, and bring the stopper 18a into contact with the lower pin 17, and the sub-sheet feed The stand 22 is mounted with its upper surface held in a horizontal state at right angles to the guide member 2. Therefore, if the lift switch is turned on after this, the elevator table 4 will move to the position where the highest sheet of paper placed on the sub-sheet feed table 22 is fed, that is, any position between a and b. The ascending sheets are sequentially carried into the printing machine by the paper feed rollers 21. In this case, the side plate 15 is moved out of the way.

In FIG. 5, which explains the operation, a trapezoid represents manual operation and a rectangle represents automatic operation. Next, from the sub paper feed tray 22 to the main paper feed tray 23
We will explain the case of changing to .

When the lowering switch is turned on as shown in Fig. 6, the lifting platform 4
is lowered from the paper feeding position of the sub-sheet feed tray 22 between a and b to position b, and at this position, lift and remove the sub-sheet feed tray 22 by hand, then set the selection switch to the main sheet feed tray 23 side and switch. When the switch is turned on, the elevator platform 4 further descends to the standby position d and stops there. Here, when the main paper feed tray 23 located at a separate position on the standby table 12 is pushed in the direction of the lifting table 4, it moves a predetermined distance and then stops. At this time, the hooks 9 provided on both sides 11 of the main paper feed table 23 are connected to the upper pins 7 of the lifting table 4.
The first switch 1 is located above the lifting path of the
3 is actuated to detect that the main paper feed table 23 is at a close position. Upon this detection, the elevator platform 4 rises, and its upper pin 7 automatically engages the hook 9 of the main paper feed tray 23, thereby removing the paper placed thereon together with the main paper feed tray 23. The uppermost one stops at the position where the paper is fed, that is, at an arbitrary position between a and c. In this case, the side plate 15
is located at the position shown in FIG. 1 and is adapted to restrict both sides of the paper.

Note that in this embodiment, position b is a position that is higher than the maximum stacking height of paper when the main paper feed tray 23 is positioned on the standby table 12, but if the standby table 12 is made long enough, this position can be adjusted. However, the present invention is not limited to this, and if the sub-sheet feeding table 22 is not provided with the side plate 20, the side plate 15 can be used as is.

Since this invention is constructed as described above, when changing the paper while feeding a large number of sheets stacked and set on the main paper feed tray, the elevator table is lowered below the standby table. After the hook that is engaged with the main paper feed tray is disengaged from the upper pin of the elevator platform, the main paper feed tray is placed on the standby platform, and the main paper feed tray is placed on the standby platform at a position away from the elevator platform. Simply raise the elevating platform, hold the sub-feeder tray loaded with paper in your hand, engage the hook with the upper pin of the elevating platform, and attach it to the main paper feeder. It is possible to easily change the size of the paper stacked on the sub-feed table without having to reload the paper by removing it from the table.

In addition, if you want to use the paper on the main paper feed tray again, hold the sub paper feed tray by hand and remove it from the lift platform, and after placing the main paper feed tray on the standby platform in a position close to the lift platform, lift it up and down. The upper pin of the elevating table can be engaged with the hook of the main paper feed tray and installed by simply raising the table above the standby table. Therefore, there is no need to reload the paper in this case as well. . Furthermore, if the number of sheets of the same size paper used exceeds the loading capacity of the main paper feed tray, you can easily feed the same paper continuously by loading the same paper left on the main paper feed tray on the sub paper feed tray. In addition to being able to continue the paper operation, only one paper feed port and one paper feed mechanism are required, so the entire device can be manufactured at low cost, which has excellent effects.

[Brief explanation of the drawing]

1 and 2 are schematic front views of the paper feeding device according to the present invention, and FIG. 3 is a schematic sectional view taken along the line ■-■ in FIG.
FIG. 4 is a schematic sectional view taken along the line ``--'' in FIG. 2, and FIGS. 5 and 6 are diagrams showing the operation of each part in the process of changing the paper feed table. 1... Machine frame, 2... Guide member, 3...
... Guide roller, 4 ... Elevating platform, 5 ...
...Sprocket, 6...Chain, 7,1
6... Upper pin, 10, 17... Lower pin,
8... Rolling roller, 9, 19... Hook, 11
a, 18a... Stopper, 11, 18...
...Both sides, 12...Waiting stand, 13...
First switch, 14...Second switch, 15,
20... Side plate, 21... Paper feed roller, 22...
...Sub paper feed tray, 23...Main paper feed tray.

Claims (1)

[Claims] 1. A pair of guide members are erected facing each other at a predetermined interval, and between the two guide members, there is provided a lifting platform that can move up and down between the upper paper feeding position and the lower standby position along the guide members. and a plurality of horizontal paper feed tables are switchably attached to the elevating table. A horizontal upper pin and a lower pin are respectively provided protruding from the upper pin, and a hook that releasably engages with the upper pin and a stopper that abuts the lower pin are provided on both sides of the main paper feed tray and the sub paper feed tray, and A standby stand is fixed to the guide member between the upper paper feeding position and the lower standby position of the elevating stand, and the standby stand connects the main paper feed stand to the elevating stand, and its hook connects to the elevating path of the upper pin of the elevating stand. The standby table is placed so as to be movable between an approach position where the stopper abuts the lower pin and a separate position horizontally apart from the approach position. At the top, there is a first detection member that detects when the main paper feed tray is close to the lifting table, and a second detection member that detects when the main paper feed tray is moved away from the lifting table. A member is provided, and when the elevating table is lowered below the standby stand, the main paper feeding stand is such that when the elevating stand is lowered below the standby stand, the engaging hook disengages from the upper pin of the elevating stand, and when the elevating stand approaches the standby stand, the elevating stand moves to the standby stand. A sheet feeding device characterized in that a hook is engaged with an upper pin of a lifting platform when the sheet feeding device is moved upwardly.