JP3254083B2 - Continuous sheet feeder for sheet-fed printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous sheet feeding apparatus for a sheet-fed printing press provided with a non-stop device which enables continuous sheet feeding by overlapping an upper sheet and a lower sheet.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show an example of a conventional continuous sheet feeder of a sheet-fed printing press. In FIG. 5, reference numerals 1a and 1b denote a pair of frames of the continuous paper feeder, and 2 denotes these frames 1
a main pile elevating device installed between a and 1b. The main pile elevating device 2 is supported by the main pile lifting chains 3a and 3b reciprocating in the vertical direction and the main pile lifting chains 3a and 3b. Rungs 4a, 4b
And the pallet 5 supported by the crosspieces 4a and 4b, and the lower stacking paper a is loaded onto the pallet 5 by an automatic pallet loading device (not shown) or the like.

Reference numeral 8 denotes an auxiliary pile elevating device constructed in the same manner as the main pile elevating device 2. The auxiliary pile elevating device 8 includes auxiliary pile lifting chains 9a and 9b which reciprocate up and down. Auxiliary pile rungs 10 supported by the auxiliary pile lifting chains 9a, 9b
a, 10b and a non-stop device (continuous paper feeder) 11 supported by the auxiliary pile rungs 10a, 10b
And the upper stack paper b is placed on the skewers 12a to 12h.

[0004] In order to superimpose the upper stacking paper b on the lower stacking paper a, a motor with a brake (see 7 in FIG. 1)
Is transmitted to the main pile lifting chains 3a, 3b via the sprockets 6a, 6b and the like to raise the crosspieces 4a, 4b, the pallet 5, and the lower stacking paper a, thereby lowering the lower stacking paper a. When the upper surface of the paper abuts against the lower surfaces of the skewers 12a to 12h, the motor with brake is stopped (the main pile elevating device 2 is stopped). After the stop, the skewers 12a to 12h between the upper and lower stacking papers b and a are moved. Pull out.

In FIG. 5, the skewers 12a to 12h are arranged so that the skewers 12a to 12h are not overlapped with each other to make it difficult to see.
h, a manual feeder is shown. In the non-stop device 11, the skewers 12a to 12h are connected in a fork shape (comb shape) by one connecting member (not shown), and the fork is mechanically connected. It is designed to be plugged in and out. When the non-stop device 11 is mounted, the fork is moved up and down by the non-stop device 11, so that the auxiliary pile elevating device 8 is not used.

FIGS. 7 to 11 show another example of a conventional continuous paper feeder for a sheet-fed printing press. In FIG. 7, reference numerals 1a and 1b denote a pair of frames of the continuous paper feeder, and 2 denotes these frames 1
a main pile elevating device installed between a and 1b. The main pile elevating device 2 is supported by the main pile lifting chains 3a and 3b reciprocating in the vertical direction and the main pile lifting chains 3a and 3b. Rungs 4a, 4b
And the pallet 5 supported by the crosspieces 4a and 4b, and the lower stacking paper a is loaded onto the pallet 5 by an automatic pallet loading device (not shown) or the like.

On the other hand, the upper stacked paper b is a fork (a plurality of skewers 12a to 12a) of a non-stop device (continuous paper feeding device) 11.
The paper on the upper surface of the upper stacked paper b is adsorbed one by one by the separator 13 and taken out. 21 is a non-stop device 1
An arm in which one column, 22 rises and falls along the column 21,
An arm lifting / lowering device 23 is provided on the column 21 to reciprocate the arm 22 in the vertical direction. A fork carrier 24 is provided on the arm 22 so as to be movable in the front-rear direction (arrow X direction). The fork carrier 24 has a front-rear direction (arrow X) and a left-right direction (arrow Y perpendicular to the arrow X).
(Fork 25) provided to be able to move in the direction

The left and right movement of the fork 25 aligns the groove 5a of the pallet 5 in the left and right direction, and the fork 25 is inserted into and pulled out of the groove 5a by the forward and backward movement. When the fork 25 is inserted into the groove 5 a of the pallet 5, the arm 22 and the fork 25 are intermittently raised by the arm elevating device 23 according to the number of papers separated by the separator 13, and the upper stacking on the pallet 5 is performed. The paper b is supported by the fork 25.

In order to overlap the upper stacking paper b on the lower stacking paper a in the state of FIG. 7, the pallet 5 and the lower stacking paper a are continuously raised by the main pile elevating device 2, and When the upper surface of the stacking paper a reaches the position of the sensor 28, it is switched to inching movement and rises, and when the upper surface of the lower stacking paper a contacts the fork 25, the main pile elevating device 2 stops and the fork 25 Is pulled out.

When the fork 25 is pulled out, the lower stacking paper a and the upper stacking paper b are overlapped, and the separator 13
As a result, the paper on the upper surface of the upper stacking paper b is sucked one by one,
When it is taken out and sent in the direction of the printing unit, and the remaining amount becomes small, the fork 25 is inserted into the groove 5a of the pallet 5 by the non-stop device 11 and supported by the fork 25.

Next, the pallet 5 is lowered by the main pile elevating device 2 to a loading position (a loading position where the next pallet 5 on which the next lower stack paper a is placed is carried into the main pile elevating device 2). After being removed, the next pallet 5
Is carried into the main pile elevating device 2 and is raised by the main pile elevating device 2 in order to overlap the lower stacking paper a and the upper stacking paper b as described above.

When the fork 25 is pulled out from the groove 5a of the pallet 5 in order to overlap the lower stacking paper a and the upper stacking paper b, sensors 26 and 27 are used to detect the start and end of the fork 25 withdrawal. The detection signals from these sensors 26 and 27 are sent to a control device (not shown), and the separator 13 moves up and down.

At this time, the separator lifting / lowering device 31 is operated, and the separator 13 rises by a certain amount at the start of the withdrawal of the fork 25, and returns to the position before the lift at the end of the withdrawal of the fork 25. Thus, fork 2
The separator 13 is raised at the start of the drawing of the sheet 5 because the front end of the upper stack paper b is lowered at the start of the withdrawal of the fork 25 as shown in FIG. Part is Fidden Roller 15
This is because the sheet may be incapable of being fed by hitting the leading end of the splash plate 14 for preventing misalignment, which is disposed close to the front of the sheet.
Therefore, as shown in FIG. 8B, the lower stacking paper b and the upper stacking paper a
And the separator 13 is also raised, so that the distance between the upper surface of the lower stacking paper b and the separator 13 is properly maintained, and the suction 13a, the blowing feet 13b, etc. of the separator 13 are normally operated.

As described above, when the fork 25 is completely removed, the separator 13 is returned to the position before the ascending, as shown in FIG. Thickness (diameter) of the skewer 12 of the fork 25
This is because the suction 13a does not reach the upper surface of the upper stacking paper b by d, and it becomes impossible to perform the separation. FIG.
The separator 13 is returned to the position before the ascending as shown in FIG.

FIGS. 10 and 11 show the separator lifting / lowering device 3.
1 is shown. The separator lifting / lowering device 31 is provided at the rear end of the screw shaft 42 of the forward / backward moving device 41, and is rotated by one of the motor 32 and the handle 33, and a pin 35 screwed to the screw shaft 34. And pin 35
And an arm 36 having a moving groove 36a.

The arm 36 is fixed to a shaft 43 on the frame side. A scale indicating an elevating position is engraved on the arm 36. One end of a screw shaft 42 is connected to the pin 35 by a top 48. The movement of the pin 35 causes the screw shaft 42, the separator 13, the guide bar 47 and the connection pin 46 to move.
The arm 45 swings vertically about the fixed shaft 44 as a fulcrum.

The separator 13 is screwed to the screw shaft 42 and is moved by the motor 47 in the front-rear direction (the direction of the arrow X) according to the size of the paper in the front-rear direction. The pin 35 is fitted in the top 48. 7 to 11 above
In the continuous sheet feeding device of the sheet-fed printing press shown in FIG. 1, when the upper stacking paper b supported by the fork 25 is being separated by the separator 13, the lifting device 23 of the non-stop device 11
As a result, the sheet intermittently rises by an amount determined according to the thickness or weight of the sheet (in the case of a tin plate).

Also, the stacked lower stack paper a and upper stack paper b are intermittently raised by the main pile elevating device 2 by the above-mentioned amount. After the fork 25 is further inserted to support the upper stack paper b, the fork 25 is pulled out, and the lifting device 23 of the non-stop device 11 is increased by the above-described amount until the lower stack paper a and the upper stack paper b are overlapped. And the main pile elevating device 2 intermittently ascend.

[0019]

The conventional continuous sheet feeder of a sheet-fed printing press shown in FIGS. 5 and 6 has the following problems. That is, when pulling out the skewers 12a to 12h from the normal position shown in FIG. 6A to the position shown in FIG.
Since the front end of the upper surface of the upper stacking paper b is lowered, the rear end of the paper on the upper surface of the upper stacking paper b is sucked by the separator 13 one by one, and when the sheet is fed toward the Fidenk roller 15, the front end of the paper is Of the paper is prevented from hitting the sheet-preventing splash plate (a sheet-slip-preventing splash plate that can swing in the front-rear direction) 14, resulting in a poor feeding posture or a failure in feeding.

FIG. 6C shows a state in which the skewers 12 have been pulled out. In this state, the upper stacking paper b is lowered by the vertical thickness d of the skewer 12 and overlaps the lower stacking paper a. At this time, the upper surface of the upper stacking paper b is also lowered by the vertical thickness d of the skewer 12, and the separator 13 cannot absorb the paper on the upper surface of the upper stacking paper b.
Paper cannot be fed.

The conventional continuous sheet feeder of the sheet-fed printing press shown in FIGS. 7 to 11 has the following problems. That is, when the lower stacking paper a and the upper stacking paper a are stacked by pulling out the fork 25 (hereinafter referred to as docking), (1) the main pile elevating and lowering intermittently due to docking Due to the variation in the stop position of the apparatus 2, the lower stack paper a may push the upper stack paper b upward through the fork 25 in some cases. At this time, if the push-up amount is excessive, the distance between the lower surface of the separator 13 and the upper surface of the upper stacking paper b becomes too small, so that the separator 13 is not smoothly separated. One breath
Parts such as 3a may be damaged. (2) When the fork 25 starts to be pulled out, there is no member for detecting the amount of downward movement of the leading end of the upper surface of the upper stacking paper b, so it is impossible to determine whether the separator 13 needs to be raised. (3) The separator 13 that has risen when the fork 25 starts to be pulled out is returned to the position before rising when the fork 25 is completely pulled out (hereinafter referred to as “zero return”). The zero point return is performed by controlling the total number of rotations of the motor 32 of the elevating device 31, but in this case, it is extremely difficult to accurately return to the zero point. (4) While the fork 25 is pulled out, the upper stacking paper b and the lower stacking paper a are separately and intermittently raised by the arm elevating device 23 and the main pile elevating device 2, respectively. The height of the upper surface of the rear end portion of the upper stacking paper b varies due to a mismatch in the rising timing of the devices 2 and 23, a difference in the rising amount, and the like. If the height is not within the proper range, the distance from the separator 13 to the upper surface of the rear end portion of the upper stacked paper b is not properly maintained, and there is a problem that poor handling occurs.

The present invention has been made in view of the above-mentioned problems, and has as its object the purpose of the present invention is to provide a paper feed failure and a feeding failure that occur when the fork is pulled out and the upper and lower sheets are overlapped. It is an object of the present invention to provide a continuous sheet feeding device for a sheet-fed printing press, which can prevent the paper from being disabled and can perform the continuous sheet feeding accurately and smoothly.

[0023]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a sheet-fed printing apparatus having a non-stop device which enables continuous paper feeding by overlapping an upper paper stack and a lower paper stack. In the continuous paper feeder of the machine, immediately before starting to remove the fork between the upper stacking paper and the lower stacking paper, the separator that feeds the rear end portion of the paper on the upper surface of the upper stacking paper and feeds the paper in the paper feeding direction. The loading paper and the lower loading paper are raised by a certain amount, and the separator is returned to a position before the lifting just before the fork is removed from between the upper loading paper and the lower loading paper. 1).

In the continuous sheet feeding device of the sheet-fed printing press,
A front-end sensor for detecting the height position of the front end of the upper stacking paper in the paper feeding direction, and a rear-end sensor for detecting the height position of the upper surface of the upper stacking paper in the paper feeding direction. And a zero return sensor for detecting that the separator has returned to the position before the ascent (claim 2).

[0025]

In the continuous sheet feeding device for a sheet-fed printing press according to the first aspect, the separator and the upper and lower stacking papers rise by a fixed amount immediately before the fork is started to be pulled out. The hanging front end of the paper on the upper surface does not catch on the spring plate, and the interval between the upper surface of the upper stacking paper and the lower surface of the separator is normally maintained, so that the separator can feed the paper accurately and smoothly. Also, at the end of the fork removal, the separator returns to the position before the ascending, so that even if the upper surface of the upper stacking paper is lowered by the fork removal, the distance between the upper surface of the upper stacking paper and the separator is kept constant. Therefore, the feeding by the separator is performed accurately and smoothly.

In the continuous sheet feeding apparatus for a sheet-fed printing press according to the second aspect, the upper side which occurs when the fork is inserted and withdrawn, particularly when the fork is withdrawn after the upper and lower stacked papers are docked via the fork. The vertical movement of the upper stacking paper and the lower stacking paper and the separator is controlled in accordance with the change in the upper surface of the stacking paper, and the interval between the lower surface of the separator and the upper surface of the upper stacking paper is maintained within an allowable range. During operation of the apparatus, the upper stacked paper is properly separated by the separator, and the continuous feed is accurately performed without stopping the feeder. Further, when the fork is completely removed (when the non-stop cycle is completed), the feeder returns to the position before the ascent by the zero-point return device, so that the separator can be properly separated after the non-stop cycle.

[0027]

【Example】

(First Embodiment) Next, a continuous sheet feeding apparatus for a sheet-fed printing press according to the present invention will be described with reference to a first embodiment shown in FIGS. 3b, a main pile lifting chain; 4a, 4b, main pile rungs; 5, a pallet (paper stacking plate) provided with fork insertion grooves;
6 is a sprocket, 7 is a drive motor of the main pile elevating device 2, 8 is an auxiliary pile elevating device, 9a and 9b are lifting chains for the auxiliary pile, 10a and 10b are crossbars for the auxiliary pile, 11 is a non-stop device, and 13 is a separator. It is.

Non-stop device (continuous paper feeder) 11
Is a support 21 and an arm 22 that moves up and down along the support 21.
An arm lifting / lowering device 23 provided on the support column 21 to reciprocate the arm 22 in the vertical direction; a pusher unit 24 provided on the arm 22 so as to be movable in the front-rear direction (arrow X direction); And a fork 25 having skewers 12a to 12h provided to be movable in the directions and left and right directions (arrow X direction and arrow Y direction).

The fork 25 is inserted into the groove 5a of the pallet 5 or pulled out of the groove 5a of the pallet 5 by moving the fork 25 in the front-rear direction. When the fork 25 is inserted into the groove 5a of the pallet, the upper stack paper b on the pallet 5 is supported by the fork 25.
Therefore, when the non-stop device 11 is used, the fork 25 is moved up and down by the arm elevating device 23, and the auxiliary pile elevating device 8 is at rest.

The pallet 5 is lowered by the main pile elevating device 2 together with the main pile crossbars 4a and 4b, and is removed at a set lowering position (Lowdenk position). After the lower stack paper b placed on the next pallet 5 is carried in,
When the lower pile paper b rises together with the pallet 5 by the main pile elevating device 2 and comes into contact with the fork 25, the main pile elevating device 2 stops and the fork 25 is pulled out.

At this time, the start and end of withdrawal of the fork 25 are detected by sensors 26 and 27 attached to the pusher unit 24, and the detection signal obtained at that time is sent to a control device (not shown), Separator elevating device (not shown) for moving 13 vertically
Is activated, and the separator 13 starts to be pulled out of the fork 25.
The upper stacking paper b and the lower stacking paper a rise by a certain amount, and at the end of removal, the separator 13 returns to the position before the lifting.

At the beginning of the withdrawal of the fork 25, the separator 13, the upper stacking paper b and the lower stacking paper a are
(B), the hanging upper surface of the upper stacking paper b becomes the same height as the spring plate 14, and the distance between the lower surface of the separator 13 and the upper surface of the upper stacking paper b is properly adjusted. The separator 13 is held normally, and the separator 13 is normally separated. Further, the front end of the paper on the upper surface of the upper stacking paper b sucked by the separator 13 does not catch on the spring plate 14.

When the fork 25 is pulled out, the separator elevating device is operated by the sensor 27, and the separator 13 returns to the position before being raised (the position shown in FIG. 2A) as shown in FIG. 2C. . Therefore, when the fork 25 is pulled out, the upper surface of the separator 13 and the upper stacking paper b is brought into the next position, that is, the upper stacking paper b supported by the fork 25 as shown in FIG. Since the sheet has been lowered to the position where the sheet has been fed, normal sheet feeding is performed.

(Second Embodiment) Next, a continuous sheet feeding apparatus for a sheet-fed printing press according to the present invention will be described with reference to a second embodiment shown in FIGS. 3 and 4, the same parts as those in FIG. 7 are denoted by the same reference numerals, and the description of the same parts is omitted. When the spring plate 14 is in the upright position as shown in FIG. 3, the spring plate 14 is located at a position P near the front end of the spring plate 14 to detect the upper surface of the front end portion of the upper stacking paper b N01.
A sensor (front end sensor) 51 is provided, and an N02 sensor (zero point return sensor) 52 is provided at a position Q at an appropriate distance below the position P to detect the upper surface of the rear end of the upper stacking paper b. N03 (rear end sensor) 53 is provided on R,
NO at position S at a proper distance downward from this position R
A sensor (zero return sensor) 54 is provided, and a potentiometer 55 for detecting the total rotation speed N of the motor 32 of the separator lifting / lowering device 31 is attached to the output shaft of the motor 32 via bevel gears 56 and 57. The positions of these sensors 51 to 55 are shown in FIG.

Next, a procedure for docking the upper stacking paper b and the lower stacking paper a by the non-stop device 11 will be described with reference to FIG. (1) Start of Operation (FIG. 4A) Before starting the operation of the sheet-fed printing press, the distance A between the upper surface of the paper loaded on the pallet 5 and the lower surface of the separator 13, and the same paper loaded The distance B between the upper surface of the spring 14 and the tip of the spring 14 at the upright position is initially set to a predetermined value. When the operation is started, the sheets of the stacked paper are adsorbed one by one from the upper surface of the separator 13 and are taken out.
Supply to the printing unit. When the distance A to the upper surface of the stacked paper exceeds the allowable range, the main pile elevating device 2 is operated by the sensor of the blowing foot 13b, and the pallet 5, that is, the stacked paper intermittently rises (increases in inching). Become A. (2) Start Inserting the Skewer (FIG. 4 (b)) When the stacked paper on the pallet 5 is separated by the separator 13 and becomes small, the height h of the remaining stacked paper (hereinafter referred to as the upper stacked paper b) is reduced. (Depending on the sheet thickness) is detected by a sensor (not shown) or the like, and the fork 25 starts to be inserted into the groove 5 a of the pallet 5. (3) Completion of insertion of the skewer (FIG. 4C) When the insertion of the fork 25 into the groove 5a of the pallet 5 is completed, the sensor 26 activates the arm lifting / lowering device 23 of the non-stop device 11, and the fork 25 and the fork 25 are loaded on top. The paper b rises intermittently according to the thickness of the paper (sheet). The rising amount at this time is determined by a time set in advance by a timer (not shown) according to the thickness or weight of the sheet of the control device. If the height of the upper surface of the upper stacking paper b is NO
3 sensor 53 and NO4 sensor 54 detect excessive rise or insufficient rise,
Are OFF, the NO3 sensor 53 is OFF and the NO4 sensor 54 is ON, and the NO3 sensor 53 and the NO4 sensor 54
Are ON, the separator 13 descends, stops (as it is), and rises. Therefore, while the upper stacking paper b is supported by the fork 25, the NO3 sensor 53 and the NO4
54, the separators 13 are separated one by one.
It is rising intermittently by 3.

When the upper stacking paper b is supported by the fork 25, the pallet 5 is lowered by the main pile lifting device 2 to the loading position. (4) During Pallet Replacement (FIG. 4D) The pallet 5 that has dropped to the loading position is removed, and a new pallet 5 on which the lower stack paper a is placed is carried into the main pile elevating device 2. During this time, the stacked paper b on the fork 25 is loosened by the separator 13 and intermittently rises as described in the above item (3), so that the height of the stacked paper b decreases. (5) New pallet deceleration (FIG. 4E) When a new pallet 5 is carried in, the main pile elevating device 2
, The sensor 28 is actuated when a predetermined position below the fork 25 is reached.
Stops and then starts an intermittent rise (inching rise). While the lower stacking paper a of the new pallet 5 is intermittently rising, the upper surface of the upper stacking paper b of one of the intermittently rising forks 25 is too high, and the NO1 sensor 51 is turned on. Then, the intermittent rising of the upper stack paper b and the lower stack paper a is stopped. (6) Pallet Docking (FIG. 4 (f)) When the lower stack paper a is docked on the fork 25, the NO1 sensor 51 checks that the upper surface of the upper stack paper b on the fork 25 is not too large. When the NO1 sensor 51 is turned ON due to excessive climbing, the lifting of the upper stacking paper b and the lower stacking paper a is stopped, and the skewing operation described in the next section is started. (7) Start of skew pulling (FIG. 4 (g)) The fork 25 starts to be pulled out from between the docked upper stacking paper b and lower stacking paper a, the front end of the upper stacking paper b descends, and the NO2 sensor 52 is turned off. Becomes the upper stacking paper b
And the lower stacking paper a, the separator 13 is NO. The sensor continuously rises until one sensor 51 is turned on, but the NO3 sensor 53 is turned off, the NO4 sensor 54 is turned on, and the separator 13 is stopped with priority. (8) During the removal of the skewer (FIG. 4 (h)) While the fork 25 is being removed, the upper stacking paper b and the lower stacking paper a rise by the NO2 sensor 52, but the NO3 sensor 53 and the NO4 sensor 54 move upward. b, the rear upper surface is detected, and the NO3 sensor 53 and the NO4 sensor 54
The separator 13 moves in accordance with N and OFF (see the above item (3)). When the removal of the fork 25 is completed, the rear end of the upper stacking paper b falls at a stretch, and the distance A to the separator 13 is greatly opened, causing poor handling. As the fork 25 comes down, the upper stacking paper b
The rear end is lowered to prevent a sudden drop. (9) Completion of removal of the skewer (FIG. 4 (i)) The sensor 27 detects completion of removal of the fork 25.
Upon completion, the separator 13 returns to the position before the ascent. Since the amount by which the fork 25 rises at the start of withdrawal is detected by the potentiometer 55, the zero point return position can be accurately determined if the fork 25 is returned until the detected amount of the potentiometer 55 becomes zero. (10) Completion of non-stop work (FIG. 4 (J) When non-stop work is completed, the non-stop device 1
1 also returns to the standby position, and the NO1 sensor 51 to NO4 sensor 54 stop detecting. Accordingly, the docked upper stacking paper b and lower stacking paper a intermittently rise in accordance with the separation of the separator 13 by the main pile lifting device 2.

As described above, in the continuous sheet feeding device of the sheet-fed printing press according to the second embodiment shown in FIGS. 3 and 4, the front end portion for detecting the height position of the front end portion of the upper surface of the upper stack of sheets in the sheet feeding direction is detected. A sensor, a rear end sensor for detecting a height position of a rear end in the paper feeding direction on an upper surface of the upper stacking paper, and a zero point return sensor for detecting that the separator has returned to a position before the ascending, There are the following advantages: That is, (1) The paper (or sheet) of the upper stacked paper is detected by the sensor.
The upper and lower limits of the height of the upper front edge of the upper stack are detected, and it is determined whether the height of the upper front edge of the upper stacking paper lowered when the fork starts to be pulled is within the allowable range, and is out of the allowable range. If it is lowered, it is possible to raise the upper and lower stacking papers together with the separator so that they fall within the allowable range. At the time of docking, the upper and lower levels of the height of the rear end of the upper side of the upper stacking paper are detected by a sensor, and if the upper stacking paper rises beyond the allowable range by the lower stacking paper, the upper stacking paper and Stopping or lowering the lower stack of paper to prevent an abnormal rise of the upper stack of paper. (2) The sensor detects the upper and lower limits of the height of the rear end of the upper surface of the upper stacking paper. If the height of the rear end of the upper surface is within the allowable range, the height is maintained and the allowable range is set in the vertical direction. If it is out of the range, lower or raise the upper stacking paper and the lower stacking paper so as to be within the allowable range, and if it is within the allowable range, the distance between the upper surface of the upper stacking paper and the lower surface of the separator becomes appropriate, Good handling by the separator. (3) Since a potentiometer that detects the total (integrated) rotation speed of the motor of the separator lifting device is used as the zero return sensor, the amount of lifting and lowering of the separator can be calculated based on the pitch of the screw shaft of the separator lifting device. Is done exactly.

[0038]

As described above, in the continuous sheet feeding apparatus for a sheet-fed printing press according to the present invention, since the separator and the upper and lower stacked papers rise by a certain amount immediately before the fork is started to be pulled out, the fork starts to be drawn out. Sometimes, the hanging front end of the paper on the upper surface of the upper stacking paper does not catch on the spring plate, and the interval between the upper surface of the upper stacking paper and the lower surface of the separator is normally maintained, so that the feeding by the separator is performed accurately and smoothly. be able to.

At the end of the fork removal, the separator returns to the position before the ascent. Therefore, even if the upper surface of the upper stacking paper is lowered by the fork withdrawal, the distance between the upper surface of the upper stacking paper and the separator is kept constant. Also from this point, sheet feeding by the separator can be performed accurately and smoothly.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a continuous sheet feeding device of a sheet-fed printing press according to the present invention.

FIGS. 2A to 2C are explanatory diagrams of the operation of the continuous sheet feeding device.

FIG. 3 is a side view showing a second embodiment of the continuous sheet feeding device of the sheet-fed printing press according to the present invention.

FIGS. 4A to 4J are explanatory diagrams of the operation of the continuous paper feeder.

FIG. 5 is a side view illustrating an example of a conventional continuous sheet feeding device of a sheet-fed printing press.

FIGS. 6A to 6C are explanatory diagrams of the operation of the continuous sheet feeding device.

FIG. 7 is a side view showing another example of a conventional continuous sheet feeding device of a sheet-fed printing press.

FIGS. 8A to 8C are explanatory views of the operation of the continuous sheet feeding apparatus.

FIGS. 9A to 9C are explanatory diagrams of the operation of the continuous sheet feeding apparatus.

FIG. 10 is a side view showing a separator elevating device of the continuous paper feeding device.

FIG. 11 is a side view taken along the line AA of FIG. 10;

[Explanation of symbols]

 2 Main pile elevating device 3a Chain 3b Chain 4a Cross bar 4b Cross bar 5 Pallet 6 Sprocket 7 Motor 8 Auxiliary pile raising and lowering device 9a Chain 9b Chain 10a Cross bar 10b Cross bar 11 Continuous continuous paper feeder (non-stop device) 13 Separator 14 Spring plate Dengue roller 21 Prop 22 Arm 23 Arm elevating device 24 Pusher unit 25 Fork 26 Sensor (proximity switch, limit switch, etc.) 27 Sensor (proximity switch, limit switch, etc.) a Lower loading paper b Upper loading paper

Continuation of the front page (72) Inventor Manabu Yasunaga 1-1, Kotobukicho, Mihara-shi, Hiroshima Pref. Inside Mihara Rishige Engineering Co., Ltd. (56) References JP-A-51-93058 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65H 1/30 320 B65H 1/18 310

Claims (2)

(57) [Claims] 1. A continuous sheet feeding device for a sheet-fed printing press having a non-stop device for enabling continuous sheet feeding by superposing an upper sheet stack and a lower sheet stack on the upper sheet stack and the lower sheet stack. Immediately before starting to pull out the fork located between the separators, the rear end of the paper on the upper side of the upper stacking paper is sucked and the separator to be fed in the paper feeding direction, the upper stacking paper and the lower stacking paper are raised by a certain amount, and A continuous sheet feeding device for a sheet-fed printing press, wherein the separator is returned to a position before being raised immediately before the fork is removed from between the stacked paper and the lower stacked paper. 2. A front end sensor for detecting a height position of a front end of the upper stacking paper in the paper feeding direction, and detecting a height position of a rear end of the upper stacking paper on the upper surface in the feeding direction. 2. A continuous sheet feeding device for a sheet-fed printing press according to claim 1, further comprising a rear end sensor for detecting the return of the separator to a position before the ascending operation.