JP2831591B2 - Printing paper feeder for 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 printing paper feeder for a printing press, and more particularly to control of operation timing of an upper feed roller and a stop finger.

[0002]

2. Description of the Related Art As a printing paper feeder of a printing machine, there is one described in Japanese Patent Publication No. 3-68830. This conventional paper feed printing paper is shown in FIGS. The printing paper is fed by an arrow 10 by a paper feed conveyor 372 shown in FIG.
It is transported in three directions and guided on the scale plate 373. A stop finger 377 is provided below the scale plate 373.
Is located. A plurality of the stop fingers 377 are provided in the axial direction with respect to the stop finger shaft 378, and swing in the directions of arrows 100 and 101 with the rotation of the stop finger shaft 378.

When the stop finger 377 rises in the direction of arrow 100 and is positioned as shown by the broken line in FIG. 23, the tip 377a of the stop finger projects upward from the surface of the scale plate 373. The print paper 10 guided on the scale plate 373 is preregistered by the stop finger tip 377a projecting from the scale plate 373.

A lower feed roller 374 is located below the scale plate 373.
74 is provided slightly projecting from the scale plate 373. Then, the lower feed roller 374 rotates in conjunction with the printing cylinder.

On the other hand, an upper feed roller 375 is located above the lower feed roller 374.
The upper feed roller 375 is rotatably supported by the arm 376. The arm 376 can swing freely with the rotation of the swing shaft 379.

Printing paper 1 guided on scale plate 373
At the time when the zero is registered in the front direction by the stop finger tip 377a, the upper feed roller 375 has risen in the direction of the arrow 100 and is in the state shown by the broken line in FIG. After the pre-registration of the printing paper 10 is performed, the stop fingers 377
23 moves down in the direction of arrow 101 around the stop finger shaft 378, and is located in the state of the solid line shown in FIG. That is, the stop finger tip 377a is connected to the scale plate 37.
It descends below 3.

The lowering of the stop finger 377
This is associated with the movement of the upper feed roller 375. That is, the arm 376 swings according to the swing shaft 379 at the same time when the stop finger 377 descends, and the upper feed roller 375 descends in the arrow 101 direction.
As a result, the printing paper 10 is moved to the lower feed roller 37.
4 and the upper feed roller 375. As described above, since the lower feed roller 374 is rotated in conjunction with the printing cylinder, the contact pressure is applied by the pinch between the lower feed roller 374 and the upper feed roller 375, so that the printing paper 10 is separated from the impression cylinder 371 and the blanket cylinder 370. Guided between.

[0008] In this way, the printing paper 10 is fed in the direction of the arrow 103 and is subjected to predetermined printing. After the printing paper 10 is fed in the direction of arrow 103, the stop finger 3
Numeral 77 rises in the direction of arrow 100 and is located in the state shown by the broken line in FIG. And this stop finger 377
At the same time, the arm 376 swings with the rotation of the swing shaft 379, and the upper feed roller 375 moves
It rises in the 0 direction and is located away from the lower feed roller 374.

In this state, the next printing paper 10 is guided on the scale plate 373 and the above operation is repeated. in this way,
Upper feed roller 375 and stop finger 3
Arrows 100, 101 in conjunction with 77 at the same timing
Reciprocate in the direction. The mechanism of this interlock is as follows.

A block 392 is attached to the swing shaft 379. The block 392 swings in conjunction with the cam follower 381, and the swing of the cam follower 381 further reduces the swing of the block 392.
Is transmitted to the swing shaft 379 via the That is, the upper feed roller 375 swings in the directions of arrows 100 and 101 according to the movement of the cam follower 381.

The cam follower 381 is in contact with a ring cam 382 provided on the blanket cylinder 370. The cam follower 381 is constantly urged in a direction in which it comes into contact with the ring cam 382 by a spring 383 applied between the block 392 and the frame 386. When the cam follower 381 comes into contact with the high portion of the ring cam 382, the block 392 is pushed in the direction of arrow 100, and the upper feed roller 375 also rises in the direction of arrow 100.

On the other hand, a stop finger driving arm 393 is further attached to the swing shaft 379, and swings according to the rotation of the swing shaft 379. An arm 388 is fixed to the stop finger shaft 378, and the arm 388 is in contact with the stop finger driving arm 393. Note that the stop finger shaft 378 is always moved by the arrow 1 by a spring (not shown).
00 direction (ie, stop finger tip 377a)
Are projected from the scale plate 373).

The upper feed roller 375 has the arrow 10
When the stop finger 377 rises in the zero direction, the stop finger 377 also rises in the direction of the arrow 100 due to the urging force of a spring (not shown) provided on the stop finger shaft 378, and the stop finger tip 377a projects from the scale plate 373. Thus, the cam follower 381 is
When the upper portion 82 comes into contact with the high portion, the upper feed roller 375 and the stop finger 377 are located in the state shown by the broken line in FIG.

On the other hand, when the cam follower 381 contacts the lower portion of the ring cam 382, the upper feed roller 375 swings in the direction of arrow 101 by the urging force of the spring 383, and changes from the state shown by the broken line to the solid line. Located in the state. At this time, the stop finger driving arm 393 that swings along the swing shaft 379.
Pushes down the arm 388 fixed to the stop finger shaft 378 in the direction of arrow 101.

By this depression, the stop finger 377 descends in the direction of arrow 101, and the stop finger tip 377a is pushed down below the scale plate 373. That is, at the same timing as the lowering of the upper feed roller 375, the stop finger 3
77 is also located in the state of the solid line shown in FIG. As described above, the upper feed roller 375 and the stop finger 377 repeat the reciprocating movement in the directions of the arrows 100 and 101 in conjunction with each other.

By the way, abnormal paper may be generated on the printing paper 10 which is successively fed along the paper feeding conveyor 372. The abnormal paper is, for example, a printing paper 10 that has been stacked due to the influence of static electricity or the like, a feeding delay of the printing paper 10, a feeding in an oblique state, or the like. Such abnormal paper is detected by an abnormal paper detector (not shown) provided near the paper feed conveyor 372.

When an abnormal paper is detected, the feeding of the printing paper 10 must be forcibly stopped. That is, the upper feed roller 375, the stop finger 377
Must be stopped in the state shown by the broken line in FIG. A conventional printing paper feeder has a configuration as shown in FIG. 24 as a mechanism for this purpose. FIG. 24 is provided outside the frame 386, that is, on the back side of the frame 386 in FIG. FIG. 24 is a side view seen from the same direction as FIG.

A latch arm 391 is fixed to the swing shaft 379 as shown in FIG. A latch 390 is rotatably mounted coaxially with the stop finger shaft 378. On the other hand, a solenoid 384 is provided on the frame 386. When abnormal paper is detected by the abnormal paper detector, the solenoid 384 is excited to attract the blankan 385 in the direction of the arrow 102.

A spring 389 is provided between the bran jean 385 and the latch 390. That is, when abnormal paper is detected, the latch 390 is pulled in according to the suction of the blankan 385 in the direction of the arrow 102, and the latch 3
90 locking end 394 abuts on latch arm 391,
It is located in the state shown by the broken line in FIG. As a result, the swing shaft 379 is forcibly stopped in a state where it is also rotated in the direction of the arrow 100.

When the swing shaft 379 is stopped in a state of being rotated in the direction of 100, the stop finger 3 is stopped.
77 also stops with the stop finger tip 377a protruding from the scale plate 373. As described above, when abnormal paper is detected, the upper feed roller 375 and the stop finger 377 shown in FIG.
Stops in a state of rising in the direction of arrow 100.

When the operator removes the abnormal paper and restarts the paper feeding operation of the printing press, the solenoid 384 is demagnetized. With this, Branjan 385 becomes 1
In the direction of 04, the contact between the locking end 394 of the latch 390 and the latch arm 391 is released. Thus, the upper feed roller 375 and the stop finger 3
The swing of 77 is started.

[0022]

The above-mentioned conventional printing paper feeding apparatus has the following problems. As described above, after the printing paper 10 guided on the scale plate 373 is sent between the blanket cylinder 370 and the impression cylinder 371, the upper feed roller 375 moves up in the direction of arrow 100. Then, as the upper feed roller 375 rises, the stop finger 377 also rises in the direction of the arrow 100, and the tip 377a of the stop finger projects from the scale plate 373.

After the leading end of the printing paper 10 is gripped by a gripper (not shown) of the impression cylinder 371, the printing paper 10
Is transported according to the rotation of the impression cylinder 371, but the lower feed roller 374 and the impression cylinder 371 have different rotation speeds. Therefore, immediately after the leading end portion of the printing paper 10 is delivered to the impression cylinder 371, the upper feed roller 375 is raised in the direction of the arrow 100, and the lower feed roller 374 is moved.
Must be released. Therefore, when the upper feed roller 375 rises, the printing paper 10 is still moving on the scale plate 373 in the direction of the arrow 103.

In this state, at the same time as the upper feed roller 375, the stop finger 377 also
Since the stop finger tip 37
7a and the back surface of the printing paper 10 come into contact with each other, causing a problem that the back surface of the printing paper 10 is damaged. In addition, when the printing paper 10 is an envelope or the like, there is a problem that the stop finger tip 377a that rises at the punching window of the envelope or the overlapping portion of the glue is caught, and a paper feeding failure occurs.

For this reason, for example, the swinging of the upper feed roller 375 and the swinging of the stop finger 377 may be operated by completely different drive mechanisms.
However, there are cases where the feed amount and the feed timing of the printing paper are adjusted according to the thickness and type of the printing paper to be fed.
In such a case, if the upper feed roller 375 and the stop finger 377 are driven by completely different mechanisms, there arises a problem that the adjustment must always be performed for both.

When both are driven by different mechanisms, the timing at which the upper feed roller 375 descends in the direction of arrow 101 and the timing at which the stop finger tip 37
The timing at which 7a descends in the direction of arrow 101 must be matched, which causes a problem that the adjustment work becomes complicated.

That is, if the lowering timing of the both is shifted, the stop finger tip 377a remains protruding from the scale plate 373 even though the upper feed roller 375 is lowered and the printing paper 10 is sent out. And the stop finger tip 377a
Therefore, there is a possibility that the sheet feeding is prevented and a sheet feeding defect occurs.

Further, if the swing of the upper feed roller 375 and the swing of the stop finger 377 are operated by completely different drive mechanisms, it is necessary to separately provide a mechanism such as a solenoid when an abnormal paper is detected. Inconvenience also occurs.

Therefore, the present invention provides a printing method in which the leading end of the stop finger does not contact the printing paper to be fed, and the feeding failure does not occur due to a difference in operation timing between the upper feed roller and the stop finger. The purpose of the present invention is to provide a printing paper feeding device in a printing machine.

[0030]

According to a first aspect of the present invention, there is provided a printing paper feeder in a printing press, wherein the printing paper is conveyed by a fixed feed roller, which oscillates toward the fixed feed roller to contact the fixed feed roller. The paper is fed in a swinging feed roller feeding state in which the print paper is fed in the paper feeding direction by being pinched and rotated between the papers. A swinging feed roller located in a swinging feed roller stopped state for stopping the feeding, wherein the swinging feed roller is fed or stopped by swinging about the swinging feed roller shaft. The swinging feed roller located on the printing paper feed trajectory is located on the stop pawl stop state for registering the printing paper, or located off the printing paper feed trajectory, A stop claw positioned in a stop claw feeding state, in which the printing paper can be fed in a paper feeding direction, and is positioned in a stop claw stop state or a stop claw feeding state by swinging about a stop claw axis. The stop pawl, which is connected directly or indirectly to the swing feed roller shaft, swings the swing feed roller according to the shape of the swing feed roller cam by contacting the swing feed roller cam. A cam follower for a swinging feed roller that positions the swinging feed roller in a swinging feeder paper feed state or a swinging feed roller stopped state, which is directly or indirectly connected to the stop claw shaft, By contacting the stop pawl, the stop pawl is swung according to the shape of the cam for the stop pawl, and the stop pawl is positioned in the stop pawl stopped state or the stop pawl feed state. A cam follower for a stop pawl, and the oscillating feed roller shaft has a pressing portion. When the oscillating feed roller is positioned in the oscillating feed roller feeding state, the pressing portion is By pressing the stop claw directly or indirectly, the stop claw is positioned in the stop claw feeding state, and the stop claw cam is moved from the rocking feed roller feeding state to the rocking feed roller stop. It is characterized in that the stop claw is positioned from the stop claw feeding state to the stop claw stop state after a predetermined time has elapsed after being positioned in the state.

According to a second aspect of the present invention, there is provided a printing paper feeder for a printing press according to the first aspect of the present invention, wherein the latch arm for the swinging feed roller fixed to the swinging feed roller shaft; A latch arm for a stop claw fixed to a shaft, a lock operation device for performing a lock operation based on an abnormal paper detection signal given from an abnormal paper detector that detects an abnormal paper of the printing paper being conveyed,
The lock operation of the lock operation device is directly or indirectly transmitted, so that the rocking device swings around the swing feed roller latch shaft and abuts on the swing feed roller latch arm to swing the feed roller. Oscillating feed roller latch for forcibly maintaining the roller stopped state, swings around the stop pawl latch shaft by transmitting the lock operation of the lock operation device directly or indirectly to the stop pawl latch arm. And a stop pawl latch for contacting the stop pawl to forcibly maintain the stop pawl stopped state.

[0032]

In the printing paper feeder for a printing press according to the first aspect, when the swinging feed roller is positioned in the swinging feed roller feeding state, the pressing portion provided on the swinging feed roller shaft has a stop claw. Is pressed directly or indirectly to position the stop claw in the stop claw feeding state.

As described above, since the stop pawl is positioned in the stop pawl feeding state by being pressed by the pressurizing portion provided on the oscillating feed roller shaft, the oscillating feed roller is brought into the oscillating feed roller feeding state. The stop claw can be positioned in the stop claw feeding state at substantially the same timing as the position of the stop claw.

Further, the cam for the stop pawl is configured to move the stop pawl from the stop pawl feeding state to the stop pawl after a predetermined time has elapsed after the oscillating feed roller is positioned from the oscillating feed roller feeding state to the oscillating feed roller stopped state. It has a shape to be positioned in the stopped state.

Therefore, even if the swing feed roller is in the stop position, the stop claw is not immediately stopped in the stop claw stop state, but is stopped at a timing delayed by a predetermined time. .

In the printing paper feeding device for a printing press according to the second aspect, when the locking device performs the locking operation, the locking operation is transmitted directly or indirectly to the swing feeding roller latch, and the swing feeding roller is rotated. Is forcibly maintained. When the lock operation device performs the lock operation, the lock operation is transmitted directly or indirectly to the stop claw latch, and the stop claw stop state of the stop claw is forcibly maintained.

Therefore, when abnormal paper is detected, the swinging feed roller is kept in a stopped state in which the swinging feed roller stops feeding the printing paper in the paper feeding direction.
As for the stop pawl, the stop pawl stopped state located on the feed path of the printing paper is maintained.

[0038]

【Example】

[Overall Configuration of Printing Press] First, the overall configuration of the printing press will be described with reference to FIG. FIG. 19 is a cross-sectional side view of the two-color offset printing press. The printing paper 10 loaded on the paper supply unit 37 is conveyed in the direction of arrow 103 by the paper supply conveyor 39. Then, after the print paper 10 is brought into contact with the stop finger 4 to perform pre-registering, the print paper 10 is sandwiched between the upper feed roller 3 and the lower feed roller 2 and fed to the paper feed cylinder 14.

The printing paper 10 fed to the paper feeding cylinder 14 rotates along the impression cylinder 40, and in the process, the first printing unit 4
1 prints the first color, and the second printing unit 42 prints the second color. Thus, the printed printing paper 10 is discharged to the delivery unit 43.

An abnormal paper detector 38 is provided near the paper feed conveyor 39. The abnormal paper detector 38 is 2
This is for detecting abnormally stacked sheets or the like. When such abnormal paper is detected, the supply of the printing paper 10 to the paper supply cylinder 14 is forcibly interrupted. The present invention relates to a mechanism such as the stop finger 4, the lower feed roller 2, and the upper feed roller 3 shown in FIG.

[First Embodiment] A first embodiment of a printing paper feeder for a printing press according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional development view of a printing press according to the present embodiment, and FIG. 2 is a sectional view of a paper feed cylinder. FIG. 3 is a side sectional view as viewed from the left side in FIG. 1, and FIG. 4 is a side view of the frame 31 as viewed from the left side in FIG. FIG.
The printing paper 10 conveyed by the paper feeding conveyor 39 shown in FIG. 9 is guided in the direction of arrow 103 (paper feeding direction) on the scale plate 9 shown in FIG. FIG. 7 shows details of the scale plate 9.

Below the scale plate 9, the stop finger 4, which is a stop claw, is located. As shown in the perspective view of FIG. 6, a plurality of the stop fingers 4 are provided and fixed in the axial direction with respect to a stop finger shaft 4J, which is a stop claw shaft. , 101 (FIG. 3). FIG. 3 shows a state where the stop finger 4 is raised in the direction of the arrow 100 (stop claw stopped state).

When the stop finger 4 rises in the direction of arrow 100, the stop finger tip 4a projects upward from the scale plate hole 9b (FIG. 7) of the scale plate. The print paper 10 guided to the scale plate 9 is preregistered by the stop finger tips 4a protruding from the scale plate 9.

Below the scale plate 9, a lower feed roller 2, which is a fixed feed roller, is located. The lower feed roller 2 is provided so as to slightly protrude from a scale plate hole 9a (FIG. 7) of the scale plate. ing. The lower feed roller 2 rotates in conjunction with the printing press.

On the other hand, an upper feed roller 3, which is a swing feed roller, is located above the lower feed roller 2. The upper feed roller 3 is rotatably supported by an upper feed roller arm 6. The upper feed roller arm 6 is fixed to the shaft 7, and the upper feed roller 3 swings in the directions of arrows 100 and 101 with the rotation of the shaft 7.

When the print paper 10 is preregistered by the stop finger tip 4a, the upper feed roller 3 is ascending in the direction of arrow 100 (the swinging feed roller is stopped). After the front registration of the printing paper 10 is performed, the stop finger 4 is lowered in the direction of the arrow 101 with the rotation of the stop finger shaft 4J, and the stop finger tip 4a is located below the scale plate ( Stop claw feeding state).

The lowering of the stop finger 4 is performed in response to the rotation of the shaft 7, and the stop finger 4 is pushed down and lowered by the rotation of the shaft 7 in the direction of the arrow 101. Has become. That is, the stop finger 4 is lowered in the direction of the arrow 101 simultaneously with the upper feed roller 3. As the upper feed roller 3 descends, the printing paper 10 is sandwiched between the lower feed roller 2 and the upper feed roller 3 (a swinging feed roller feeding state).

As described above, since the lower feed roller 2 is rotated in conjunction with the printing cylinder, the printing paper 10 is directed toward the paper feeding cylinder 14 when contact pressure is applied by being pinched by the upper feed roller 3. Is fed in the direction of arrow 103. Thus, the printing paper 10 is fed to the paper feed cylinder 14.
As described with reference to FIG. 19, predetermined printing is performed in the subsequent transport process.

After the printing paper 10 has been fed in the direction of arrow 103, the upper feed roller 3 rises in the direction of arrow 100 and is located apart from the lower feed roller 2. FIG. 3 shows that the upper feed roller 3 is the lower feed roller 2.
It shows the state separated from. In the present embodiment, after the upper feed roller 3 moves up in the direction of arrow 100,
The stop finger 4 is maintained in a state of being lowered in the direction of the arrow 101 (stop claw feeding state) for a predetermined time.

After a predetermined time has elapsed, the stop finger 4 rises in the direction of arrow 100 and returns to the state shown in FIG. That is, after the upper feed roller 3 moves up, the stop finger 4
Will rise. Stop finger 4 is arrow 1
At the time when the printing paper 10 rises in the 00 direction, the printing paper 10 is completely fed to the paper feeding cylinder 14 and does not remain on the scale plate 9. For this reason, the ascending stop finger tip 4a
Does not contact the back surface of the printing paper 10.

Thus, the upper feed roller 3 and the stop finger 4 return to the state shown in FIG. 3, after which the next printing paper 10 is guided on the scale plate 9, and the above operation is repeated. As described above, the upper feed roller 3 and the stop finger 4 are simultaneously lowered in the direction of the arrow 101, and after the upper feed roller 3 is raised in the direction of the arrow 100, the stop finger 4 is raised in the direction of the arrow 100 at a timing delayed by a predetermined time. It has become.
The details of each unit will be described below.

As shown in FIGS. 1 and 6, the lower feed roller 2 includes bearings 47 provided on bearing holders 49 and 50 fixed to the frames 30 and 31.
48 is provided so as to be rotatable. A gear 46 is fixed to one end of the lower feed roller 2, and rotational driving is transmitted from a gear (not shown) of the paper feed cylinder 14 via idle gears 44 and 45. In addition, the stop finger shaft 4J is rotatably provided on metals 57, 58 fixed to the frames 30, 31.

On the other hand, upper feed roller arms 6 are integrally fixed to both ends of the shaft 7 as shown in FIG. The upper feed roller 3 is attached between the two upper feed roller arms 6 by pins 53 and 54. Note that the upper feed roller 3 rotates smoothly by the bearings 51 and 52 shown in FIG.

Outside the upper feed roller arm 6 of the shaft 7, a cam 33 and a cam lever 1 are further provided.
1 is attached. The cam 33 and the cam lever 11 are provided rotatably with respect to the shaft 7. One upper feed roller arm 6 has a block mounting portion 6.
The adjusting screw 34 penetrates the block mounting portion 6a.

A spring 35 is attached to the adjusting screw 34, and the adjusting screw 34 further penetrates the cam lever wall 11 a of the cam lever 11. The adjusting knob 15 is screwed into the tip of the adjusting screw 34 penetrating the cam lever wall 11a. That is, the upper feed roller arm 6 and the cam lever 11 are connected to the adjusting screw 3 with the spring 35 interposed therebetween.
4. Connected by adjustment knob 15. By loosening or tightening the adjustment knob 15, the relative positional relationship between the upper feed roller arm 6 and the cam lever 11 can be adjusted.

At the tip of the cam lever 11, a cam follower 5 as a swing feed roller is rotatably provided. As shown in FIG. 3, the cam follower 5 comes into contact with an upper feed roller cam 8 serving as a swing feed roller cam provided on the paper feed cylinder 14. FIG. 2 shows the positional relationship between the paper feed cylinder 14 and the upper feed roller cam 8.

On the other hand, the block 1 is attached to the block attaching portion 6a of the upper feed roller arm 6 by a screw 59.
8 is fixed. The block 18 is a block mounting portion 6
It has a block projecting portion 18a projecting outward when viewed from a. A thread groove is formed in the block projecting portion 18a, and the adjusting bolt 16 is screwed into the thread groove. A nut 17 is also attached to the adjustment bolt 16, and the position of the adjustment bolt 16 is locked by the nut 17.

The adjusting bolt 16 is screwed into and penetrates a screw hole formed in the block projecting portion 18a.
A cam contact portion 33a. The cam 33 has the spring 12 attached thereto, and is urged in the direction of arrow 100 as shown in FIG. Since the cam 33 is urged in the direction of arrow 100, the tip of the adjustment bolt 16 is pressed, and the upper feed roller arm 6, the shaft 7, and the upper feed roller 3 are urged in the direction of arrow 100 via the block 18. Will be done.

When the paper feed cylinder 14 shown in FIG. 3 rotates and the cam follower 5 contacts the high portion of the upper feed roller cam 8, the cam lever 11 is pushed down in the direction of arrow 101. As described above, since the cam lever 11 and the block mounting portion 6a are connected by the adjustment screw 34 and the adjustment knob 15, the upper feed roller 3 also descends in the direction of arrow 101 when the cam lever 11 descends in the direction of arrow 101. , The print paper 10 is sandwiched between the lower feed roller 2.

In this way, the printing paper 10 is pressed by the upper feed roller 3 and is fed in the direction of the arrow 103 by the rotation of the lower feed roller 2. By rotating the adjustment knob 15, the relative positional relationship between the upper feed roller arm 6 and the cam lever 11 can be adjusted, and the contact pressure between the upper feed roller 3 and the lower feed roller 2 can be adjusted.

When the cam follower 5 is pushed down in the direction of the arrow 101 by the upper feed roller cam 8, the tip of the adjusting bolt 16 presses the cam contact portion 33a of the cam 33, and the cam 33 is moved in the direction of the arrow 101. Rotate. By the rotation of the cam 33, the stop finger 4 is lowered in the direction of the arrow 101.

That is, as shown in FIG. 6, the cam 13 is integrally fixed to the stop finger shaft 4J.
The cam pressing portion 33 b (pressing portion) of the cam 33 is located in contact with the cam 13. The cam 33 has an arrow 101
The cam pressing portion 33b is rotated in the
3 and the stop finger shaft 4J
Rotates in the direction of arrow 101.

Then, by the rotation of the stop finger shaft 4J in the direction of arrow 101, the stop finger 4 descends in the direction of arrow 101, and the tip 4a of the stop finger is located below the scale plate. ). The angle of the cam 33 with respect to the stop finger shaft 4J can be adjusted by rotating the adjustment bolt 16, and the degree of lowering of the stop finger 4 can be controlled by adjusting the angle.
As described above, the upper feed roller 3 has the arrow 1
At the same time when the stop finger 4 is lowered in the 01 direction, the stop finger 4 can also be lowered in the arrow 101 direction.

Next, the upper feed roller 3 is driven by the arrow 10
The operation in the case of rising in the 0 direction will be described. As shown in FIG. 3, when the cam follower 5 comes into contact with the lower portion of the upper feed roller cam 8 provided on the paper feed cylinder 14, the cam lever 11 is pulled up by the spring 12 in the direction of arrow 100.

Accordingly, the adjusting screw 34 and the adjusting knob 1
5, the upper feed roller arm 6 connected to the cam lever 11 also rotates in the direction of the arrow 100, and the upper feed roller 3 rises and is separated from the lower feed roller 2. In this case, stop finger 4
Does not immediately rise in the direction of arrow 100. This mechanism will be described with reference to FIGS.

As shown in FIGS. 1 and 4, on the outside of the frame 31, an arm 23 is integrally fixed to a stop finger shaft 4J. On the other hand, the arm 20 is swingably attached to the arm shaft 20J provided on the frame 31. A cam follower 21 is rotatably attached to one end of the arm 20, and a cam follower 22 is rotatably attached to the other end.

The cam follower 22 is in contact with the arm 23, and the cam follower 21 is in contact with the stop finger cam 19 provided on the paper feed cylinder 14. FIG. 2 shows the positional relationship between the paper feed cylinder 14 and the stop finger cam 19. The arm 20 is provided with a spring 24,
The arm 20 is urged in the direction of arrow 100.

The stop finger 4 shown in FIG.
When ascending in the direction of 00, the cam follower 21 in FIG. 4 is positioned in contact with the lower portion of the stop finger cam 19. That is, the cam follower 21 indicates the arrow 1
The cam follower 22 is pressing the arm 23 in the state where the arm 23 is rotated in the direction of 00. The stop finger 4 is rotated in the direction of the arrow 101 even though the cam pressing portion 33b of the cam 33 is released from the cam 13 by the pressing of the cam follower 22 and the pressing is released (stop claw feeding state). To maintain.

In this way, even if the upper feed roller 3 rises in the direction of arrow 100, the stop finger 4 is held for a predetermined time in a state of falling in the direction of arrow 101. The stop finger cam 19 has a shape such that the cam follower 21 contacts a high portion after the printing paper 10 has completely passed over the scale plate 9.

When the cam follower 21 contacts the high portion of the stop finger cam 19, the arm 20
4 and rotates in the direction of arrow 101. Thus, the pressing of the cam follower 22 against the arm 23 is released, and the stop finger shaft 4J is rotated and returned in the direction of the arrow 100 by the spring 36 (see FIGS. 1 and 6). By the rotation of the stop finger shaft 4J, the stop finger 4 in FIG.
The stop finger tip 4a projects from the scale plate 9 (stop claw stopped state).

The stop finger cam 19 shown in FIG.
Is provided with the above-described shape, and after the upper feed roller 3 rises in the direction of arrow 100, the stop finger 4
It can be raised in the zero direction.

FIGS. 8 to 17 show the respective operating states corresponding to FIGS. First, FIG. 8 shows that the upper feed roller 3 is raised in the
9 shows a state in which the stop finger tip 4a protrudes upward from the scale plate 9. FIG.

In this case, as shown in FIG. 9, the cam follower 21 is in contact with a high portion of the stop finger cam 19, and the cam follower 22 and the arm 23 are separated from each other. In this state, the printing paper 1 is placed on the scale plate 9.
0 is conveyed, and the leading end of the printing paper 10 comes into contact with the stop finger leading end portion 4a to perform the front registration.

Thereafter, the paper feed cylinder 14 rotates, and the state shown in FIGS. 10 and 11 is obtained. As shown in FIG. 10, the cam follower 5 is in contact with a high portion of the upper feed roller cam 8. In this case, as described above, the upper feed roller 3 descends in the direction of the arrow 101, and accordingly, the cam 13 is pushed down by the cam pressing portion 33b of the cam 33, and the stop finger 4 also starts descending in the direction of the arrow 101. When the stop finger 4 descends in the direction of the arrow 101, the arm 23 rotates in the direction of the arrow 101 as shown in FIG.

FIGS. 12 and 13 show the state in which the paper feed cylinder 14 is further rotated. As shown in FIG. 12, the upper feed roller 3 is completely lowered in the direction of the arrow 101, and comes into contact with the lower feed roller 2 to feed the printing paper 10 to the paper feed cylinder 14.
Feed paper toward. At this time, the stop finger 4 is also completely lowered in the arrow 101 direction. in this case,
As shown in FIG. 13, the cam follower 21 is in contact with the lower portion of the stop finger cam 19, and the cam follower 22 is located in contact with the arm 23.

From this state, the paper feed cylinder 14 is further rotated to reach the state shown in FIGS. 14 and 15. As shown in FIG. 14, the cam follower 5 gradually comes into contact with the lower portion of the cam 8 for the upper feed roller. In response, the upper feed roller 3 also gradually moves to the arrow 100.
And starts moving in a direction away from the lower feed roller 2. Thereby, the lower feed roller 2
And the contact with the upper feed roller 3 is released.

As shown in FIG. 15, the cam follower 21
In this case, the cam follower 22 is in contact with the lower portion of the cam follower 21 so that the cam follower 22 is
This is a state in which the arm 23 is urged in the 0 direction and is pushed down. For this reason, the upper feed roller 3 is
The stop finger 4 is held in a state where the stop finger 4 is lowered in the direction of the arrow 101 even though the stop finger 4 is raised in the 0 direction.

FIGS. 16 and 17 show the state in which the paper feed cylinder 14 is further rotated. At the stage of FIGS. 16 and 17,
The printing paper 10 is completely fed to the paper feeding cylinder 14, and the printing paper 10 does not remain on the scale plate 9.
As shown in FIG. 17, the cam follower 2
1 starts to contact the high part of the stop finger cam 19.

When the cam follower 21 contacts the high portion of the stop finger cam 19, the cam follower 22 swings in the direction of the arrow 101, and the pressing on the arm 23 is released. Along with this, the stop finger shaft 4J starts returning in the direction of arrow 100 by the spring 36 (FIG. 1), and the stop finger 4 rises in the direction of arrow 100 as shown in FIG.

Thus, the stop finger tip 4a
Project above the scale plate 9. FIG. 8 described above
17 is repeated, the upper feed roller 3 and the stop finger 4 swing and the printing paper 1
0 are fed one after another toward the feeding mechanism 14.

Incidentally, the paper feed conveyor 39 shown in FIG.
An abnormal paper may be generated on the printing paper 10 sent one after another along the upper side. The abnormal paper is, for example, a printing paper 10 that has been stacked two times due to the influence of static electricity or the like, as well as feeding of the printing paper 10 in a delayed or oblique state. Such abnormal paper is detected by an abnormal paper detector 38 provided near the paper feed conveyor 39. When abnormal paper is detected, the feeding of the printing paper 10 must be forcibly stopped. That is, as shown in FIG.
It is necessary to stop in a state where it is raised in the 0 direction.

FIG. 18 shows a mechanism for this purpose. This figure 1
The mechanism shown in FIG. 8 is provided outside the frame 30 in FIG. FIG. 18 is a view of the frame 30 viewed from the right in FIG. The frame 25 has a solenoid 25
Is fixed, and the solenoid 25 is activated by an abnormal paper detection signal from the abnormal paper detector 38.

On the other hand, a latch arm 27 is fixed to the shaft 7, and a latch arm 29 is fixed to the stop finger shaft 4J. The frame 30 is provided with a latch 26 that swings around a latch shaft 26J. One end of the latch 26 can be engaged with the latch arm 27, and a link 62 is connected to the other end of the latch 26. A spring 64 is provided between the other end of the latch 26 and the link 62, and the
6 is urged in the direction of the arrow 105, that is, in the direction engaging with the latch arm 27.

The frame 30 is provided with a latch 28 that swings around a latch shaft 28J. One end of the latch 28 can be engaged with a latch arm 29, and a link 63 is connected to the other end of the latch 28. A spring 65 is provided between the other end of the latch 28 and a link 63.
It is urged in the direction 05, that is, the direction engaging with the latch arm 29.

The other ends of the links 62 and 63 are connected to the intermediate member 60. The intermediate member 60 can swing about an intermediate member shaft 60J. Further, an arm 61 connected to the solenoid 25 is connected to the intermediate member 60. A spring 66 is hung between the arm 61 and the frame 30, and the arm 61 is urged in the direction of arrow 107.

When the abnormal paper detector 38 detects abnormal paper and the abnormal paper detection signal is given to the solenoid 25, the solenoid 25 is excited to attract the arm 61 in the direction of arrow 108. As a result, the intermediate member 60 swings in the direction of the arrow 105, and the swing of the intermediate member 60 is transmitted to the latch 26 via the link 62. In this case, the latch 26 is
4, the latch arm 27 rotates in the direction of arrow 105.
Engage with.

The swing of the intermediate member 60 is transmitted to the latch 28 via the link 63. In this case, the latch 28
Is rotated in the direction of the arrow 105 by the spring 65 and engages with the latch arm 29. As described above, when the solenoid 25 is excited, the latch arms 27 and 29
Will be locked in the position shown in FIG. That is, the upper feed roller 3 and the stop finger 4 are
Is forcibly stopped in a state of rising in the direction of arrow 100 shown in FIG.

In this case as well, the paper feed cylinder 14 is rotating, and with this rotation, the cam follower 5 comes into contact with the high portion of the upper feed roller cam 8.
The cam lever 11 is pushed down in the direction of arrow 101 (see FIG. 3). However, in this case, since the shaft 7 is fixed in the locked state shown in FIG. 18, the movement of the cam lever 11 in the direction of the arrow 101 is absorbed by the spring 35 (FIG. 5).

Similarly, the position of the stop finger shaft 4J is fixed by the latch 28 and the latch arm 29 shown in FIG. Therefore, the lower portion of the stop finger cam 19 shown in FIG. 4 does not come into contact with the cam follower 21, and the cam follower 21 is located away from the stop finger cam 19 in this portion.

When the abnormal paper is detected in this way, the feeding of the printing paper 10 is forcibly stopped, and the abnormal paper is removed by the operator. Then, when restarting the print paper feeding operation, the solenoid 25 in FIG. 18 is demagnetized. As a result, the arm 61 returns in the direction of arrow 107, and the latch 2
6 and 28 respectively swing in the direction of the arrow 106 to release the engagement with the latch arms 27 and 29, respectively. After this,
Again, the upper feed roller 3 and the stop finger 4 are moved by the mechanism shown in FIGS.
The swing in the direction of 101 is repeated.

[Second Embodiment] FIG. 20 shows a second embodiment of the printing paper feeder in the printing press according to the present invention.
The mechanism shown in FIG. 20 is provided outside the frame 30 (FIG. 1). That is, FIG. 2 is a view of the frame 30 viewed from the right in FIG. FIG. 21 shows a side sectional view corresponding to FIG. 3 viewed from the same direction (right side) as FIG. FIG. 22 is an expanded sectional view of the vicinity of the frame 30 in this embodiment.

The state shown in FIG. 20 shows a state where the solenoid 25 is excited and the upper feed roller 3 and the stop finger 4 are forcibly stopped in a state of rising in the direction of arrow 100. The mechanism for forcibly stopping the solenoid 25 will be described later. During normal operation,
The latch 81 and the arm 68 and the latch 83 and the arm 75 shown in FIG.

First, a mechanism for swinging the upper feed roller 3 and the stop finger 4 will be described with reference to FIG. An arm 68 is fixed to the shaft 7, and a bolt 69 passes through the arm 68. A cam 70 is swingably mounted on the shaft 7. The tip of the bolt 69 described above is positioned in contact with the cam 70.

On the other hand, an arm 71 is fixed to the stop finger shaft 4J, and the tip of the cam 70 is located in contact with the arm 71. Further, a link 72 is connected to the arm 71, and the other end of the link 72 is connected to the arm 75. This link 72 is
3 is urged in the direction of arrow 108.

The arm 75 is connected to the arm 76 by a pin 84.
Attached to. The arm 76 has an arm shaft 7
6J can be swung in the directions of arrows 105 and 106. A cam follower 77 as a stop claw cam follower is rotatably supported at the tip of the arm 76. The cam follower 77 is in contact with a stop finger cam 67 serving as a stop claw cam fixed to the paper feed cylinder 14.

When the cam follower 5 comes into contact with a high portion of the upper feed roller cam 8 shown in FIG. 21, the shaft 7 rotates in the direction of the arrow 106. Along with this rotation, a bolt 69 provided on the arm 68 shown in FIG.
Rotate in the direction. When the cam 70 rotates in the direction of the arrow 106, the tip of the cam 70 further
1, the stop finger shaft 4J rotates in the direction of the arrow 106.

As a result, the stop finger 4 shown in FIG. 21 descends in the direction of the arrow 106, and the stop finger tip 4a is located below the scale plate 9 (stop claw feeding state). Thus, at the same time when the upper feed roller 3 moves down in the direction of arrow 106 (oscillating feed roller feeding state), the stop finger 4 also moves down in the direction of arrow 106, and the printing paper 10 located on the scale plate 9 moves in the direction of arrow 1.
Paper is fed in the 03 direction.

Thereafter, when the cam follower 5 comes into contact with the lower portion of the upper feed roller cam 8 shown in FIG.
Rotation return in the direction. At this time, the cam follower 77 shown in FIG. 20 is in contact with the high portion of the stop finger cam 67. For this reason, the cam follower 77 remains in the state of swinging in the direction of the arrow 106, and accordingly, the arm 71 also swings in the direction of the arrow 106 via the link 72.

That is, even when the upper feed roller 3 rises in the direction of arrow 105 (the swinging feed roller is stopped), the stop finger shaft 4J maintains the state of swinging in the direction of the arrow 106 (stop pawl stopped state). And the stop finger 4 keeps the state located below the scale plate 9. In this case, the tip of the bolt 69 and the cam 70 shown in FIG. 20 are located apart from each other.

Thereafter, with the rotation of the paper feed cylinder 14, FIG.
When the stop finger cam 67 rotates and the cam follower 77 comes into contact with the lower portion, the arm 76 is positioned in the direction of the arrow 105 by the urging force of the spring 73, and accordingly, the arm 71 also moves in the direction of the arrow 105. Rotate.

As a result, the stop finger 4 shown in FIG. 21 also rises in the direction of the arrow 105, and the tip 4a of the stop finger projects from the scale plate 9. As described above, after the upper feed roller 3 is raised by the mechanism shown in FIG. 20, the stop finger 4 is raised in the direction of the arrow 105 at a timing when a predetermined time has elapsed.

Next, the operation when the abnormal paper is detected by the abnormal paper detector 38 (FIG. 19) and the solenoid 25 shown in FIG. 20 is excited will be described. When the solenoid 25 is excited, the arm 78 is attracted in the direction of arrow 107, and the intermediate member 79 swings in the direction of arrow 106. As a result, the latch 81 rotates in the direction of arrow 105 and engages with the arm 68. Further, with the rotation of the intermediate member 79 in the direction of arrow 105, the latch 83 also swings in the direction of arrow 105,
Engages.

Thus, the lock state is established as shown in FIG. 20, and the rotation of the shaft 7 and the stop finger shaft 4J is forcibly stopped. As a result, FIG.
The upper feed roller 3 and the stop finger 4 shown in FIG. The other mechanisms are the same as in the first embodiment.

[Other Embodiments] The present invention is not limited to the configuration shown in each of the above embodiments, but stops at substantially the same timing as when the swinging feed roller is positioned in the swinging feed roller feeding state. After the pawl is in the stop pawl feed state and the swing feed roller is in the stop state of the swing feed roller according to the shape of the stop pawl cam, the stop pawl stops at a timing delayed by a predetermined time. Other configurations may be employed as long as they are located in the state.

[0105]

According to the first aspect of the present invention, when the swinging feed roller is in the swinging feed roller feeding state, the pressurizing section provided on the swinging feed roller shaft is provided. By pressing the stop claw directly or indirectly, the stop claw is positioned in the stop claw feeding state.

As described above, since the stop claw is pressed by the pressurizing portion provided on the swinging feed roller shaft to position the stop claw in the stop claw feeding state, the swinging feed roller is set to the rocking feed roller feeding state. The stop claw can be positioned in the stop claw feeding state at substantially the same timing as the position of the stop claw.

Therefore, a paper feed failure caused by a timing difference between the rocking feed roller feeding state of the rocking feed roller and the stop pawl feeding state of the stop pawl, that is, the rocking feed roller feeds the printing paper In spite of feeding in the direction, it is possible to avoid a situation in which the stop claw is positioned on the feed path of the print sheet and the feed of the print sheet is prevented. Further, when adjusting the paper feed timing, it is only necessary to adjust the timing of the swing feed roller, and it is not necessary to adjust the timing of the stop claw.

Further, the stop pawl cam is moved from the stop feeding state to the stop pawl feeding state after a lapse of a predetermined time after the oscillating feed roller is in the oscillating feed roller stopped state from the oscillating feed roller feeding state. It has a shape to be positioned in the stopped state.

That is, even if the swing feed roller is in the swing feed roller stopped state, the stop claw is not immediately positioned in the stop claw stopped state, but is positioned in the stop claw stopped state at a timing delayed by a predetermined time. .

Therefore, the stop claw does not come into contact with the printing paper fed in the paper feeding direction, and there is no possibility that the printing paper is damaged or a paper feeding failure is caused by being caught.

In the printing paper feeding device for a printing press according to the second aspect, when the locking device performs the locking operation, the locking operation is directly or indirectly transmitted to the swing feeding roller latch, and the swing feeding roller is latched. Is forcibly maintained. When the lock operation device performs the lock operation, the lock operation is transmitted directly or indirectly to the stop claw latch, and the stop claw stop state of the stop claw is forcibly maintained.

That is, when an abnormal paper is detected, the swinging feed roller is kept in a stopped state in which the swinging feed roller stops feeding the printing paper in the paper feeding direction, and the stop pawl is stopped. The stop claw stop state located on the feed track is maintained.

Therefore, it is possible to reliably prevent abnormal paper from being fed. The oscillating feed roller stopped state of the oscillating feed roller, and the stop pawl stopped state of the stop pawl are controlled even though their timings are controlled by the oscillating feed roller cam and the stop pawl cam, which are separate mechanisms. By the locking operation of the lock operation device, both are forcibly oscillating feed roller stopped state,
The stop pawl can be in a stopped state.

[Brief description of the drawings]

FIG. 1 is a sectional development view showing a first embodiment of a printing paper feeding device in a printing press according to the present invention.

FIG. 2 is a sectional development view of a paper feed cylinder showing a first embodiment of a printing paper feeding device in the printing press according to the present invention.

FIG. 3 is a side sectional view showing a first embodiment of a printing paper feeding device in the printing press according to the present invention.

FIG. 4 is a side view showing a first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 5 is an exploded perspective view of an upper feed roller and the like in the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 6 is an exploded perspective view of a lower feed roller, a stop finger, and the like in the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 7 is an exploded perspective view of a scale plate and the like in the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 8 is a side sectional view showing an operation state of the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 9 is a side view showing an operation state of the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 10 is a side sectional view showing an operation state of the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 11 is a side view showing an operation state of the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 12 is a side sectional view showing an operation state of the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 13 is a side view showing an operation state of the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 14 is a side sectional view showing an operation state of the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 15 is a side view showing an operation state of the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 16 is a side sectional view showing an operation state of the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 17 is a side view showing an operation state of the first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 18 is a side view showing a first embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 19 is a diagram illustrating an overall configuration of a printing press.

FIG. 20 is a side view showing a second embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 21 is a side sectional view showing a second embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 22 is a sectional view showing a second embodiment of the printing paper feeding device in the printing press according to the present invention.

FIG. 23 is a side sectional view showing a printing paper feeding device in a conventional printing press.

FIG. 24 is a side view showing a printing paper feeding device in a conventional printing press.

[Explanation of symbols]

 2 Lower feed roller 2J Lower feed roller shaft 3 Upper feed roller 3J Upper feed roller shaft 4 Stop finger 4J ··· Stop finger shaft 5 ··· Cam follower 7 ··· Shaft 8 ··· Cam for upper feed roller 19 ··· Cam for stop finger 25 ··· Solenoid 26 · ... Latch 27 ... Latch arm 28 ... Latch 29 ... Latch arm

Claims (2)

(57) [Claims] A fixed feed roller to which the conveyed printing paper comes in contact, swings toward the fixed feed roller, and nips the printing paper between the fixed feeding roller and the printing paper to rotate so as to feed the printing paper in the paper feeding direction. Oscillating feed located in the dynamic feed roller feeding state or in the oscillating feed roller stopped state in which the print paper that oscillates in the direction away from the fixed feed roller and stops contact with the fixed feed roller in the feed direction is stopped. A roller, which is positioned on the printing paper feed track by oscillating about the oscillating feed roller shaft, whereby the oscillating feed roller is in a paper feeding state or in a stopped state. In the stop claw stop state for registering the printing paper, or in the stop claw feeding state in which the printing paper is fed out of the feeding path and the printing paper can be fed in the paper feeding direction. A stop claw that is positioned in a stop claw stop state or a stop claw feed state by swinging about a stop claw axis, and is directly or indirectly connected to the swinging feed roller shaft. By contacting the swing feed roller cam, the swing feed roller is swung according to the shape of the swing feed roller cam, and the swing feed roller is fed into the swing feed roller or the swing feed roller. A cam follower for a swinging feed roller positioned in a stopped state, which is directly or indirectly connected to the stop claw shaft,
A stop pawl cam follower that contacts the stop pawl cam to swing the stop pawl according to the shape of the stop pawl cam and positions the stop pawl in a stop pawl stopped state or a stop pawl feed state. The swing feed roller shaft has a pressing portion, and when the swing feed roller is positioned in the swing feed roller feeding state, the press portion directly or indirectly presses the stop claw. By moving the stop pawl to the stop pawl feeding state, the stop pawl cam is moved for a predetermined time after the swing feed roller is positioned in the swing feed roller stopped state from the swing feed roller feed state. A printing paper feeding device for a printing press, wherein the printing paper feeding device is provided with a shape such that the stop claw is later positioned from the stop claw feeding state to the stop claw stopping state. 2. A printing paper feeder for a printing press according to claim 1, wherein: a latch arm for a swing feed roller fixed to said swing feed roller shaft; a latch arm for a stop claw fixed to said stop claw shaft; A locking device for performing a locking operation based on an abnormal paper detection signal provided from an abnormal paper detector that detects an abnormal paper of a printing paper being conveyed, and a rocking operation performed by directly or indirectly transmitting the locking operation of the locking device. Oscillating feed roller latch and lock that oscillate about the oscillating feed roller latch shaft and abut the oscillating feed roller latch arm to forcibly maintain the oscillating feed roller's oscillating feed roller stopped state. When the locking operation of the operating device is transmitted directly or indirectly, the actuator swings around the stop pawl latch shaft and abuts the stop pawl latch arm. Te, the printing sheet feeding device in a printing press, characterized by comprising forced stop pawl latch to maintain the stop pawl stop state of the stop pawl.