JP2785995B2 - Photographic paper winding method and transport device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a photographic paper winding method and a transport device.

[Conventional technology]

In a photoprinting machine, a magazine in which photographic paper (hereinafter, referred to as paper) is wound up and stored in a roll shape is used to convey the paper to a print position. The magazine includes a simple type in which paper is simply wound and stored in a roll shape, such as a cardboard magazine, and a type in which a winding shaft is rotatable so that the paper can be rewound. . When the width of the paper, the surface type such as gloss or silk is changed, or when printing is completed, the paper is cut near the paper entrance of the magazine in the simple type. In the rewind type, the paper is cut immediately after the printed frame, and the subsequent paper is rewound into the magazine by reversing the winding shaft. The reverse rotation of the winding shaft is performed manually or automatically by a motor.

[Problems to be solved by the invention]

However, in the case of manually rewinding the paper by rotating the take-up shaft, there is a problem that the paper rewinding operation is required and the efficiency is reduced. Further, when the winding shaft is simply reversed by a motor and the paper is rewound, two motors, one for feeding the paper and the other for rewinding, are required, and there is a problem that the manufacturing cost increases.
Also, simply reversing the winding shaft with a motor
Due to inertia at the time of rewinding the paper roll, the leading end of the paper may be wound into the magazine. In this case, it is necessary to take out the leading end of the paper from the magazine, and there is a problem that it takes time to reset the magazine.

The present invention has been made to solve the above-described problem, and can efficiently take up paper in a magazine without using two motors, and take up the paper so that the leading end of the paper is not taken up in the magazine. It is an object of the present invention to provide a photographic paper winding method and a transport device with improved stopping accuracy.

[Means for solving the problem]

In order to achieve the above object, the invention according to claim 1 is:
In a photographic paper winding method for winding photographic paper sent out from a magazine having a winding shaft by a nip roller to a magazine side, the photographic paper is rotated by rotation of the winding shaft so that the leading end of the photographic paper is located near the nip roller. A first return to return, and a second return to stop the rotation of the winding shaft after the first return, rotate the nip roller in a direction opposite to the photographic paper feeding direction, and discharge the leading end of the photographic paper from the nip roller. Is performed.

According to a second aspect of the present invention, there is provided a photographic paper transport device for a photographic printing machine provided with a motor for rotating a take-up shaft in a magazine in a take-up direction. A nip roller for returning, a transmission mechanism for selectively transmitting the force of the motor to the nip roller and the take-up shaft, and a rotation of the take-up shaft in the take-up direction so that the leading end of the printing paper is close to the nip roller. And a controller for performing a second return for rotating the nip roller in the return direction by the transmission mechanism and discharging the leading end of the printing paper from the nip roller after the first return. Things. A sensor for detecting the passage of the leading edge of the photographic paper is provided upstream of the nip roller in the photographic paper returning direction. In the first return, the photographic paper is detected based on the leading edge detection signal of the photographic paper from the sensor. Is preferably stopped near the nip roller.

[Action]

At the time of paper feeding, the driving force of the motor is transmitted to the nip roller side via the transmission mechanism, and the paper is fed from the magazine by the rotation of the nip roller in the feeding direction. The paper sent to the print position is fed by the paper feed unit after printing exposure, the exposed frame is discharged from the print position, and a new unexposed paper is set at the print position. When returning the unexposed portion of the paper to the magazine for replacing the paper or ending the printing operation, the paper is cut by the cutter immediately after the exposed frame. Thereafter, the transmission means is switched from the nip roller side to the winding shaft side, and the driving force of the motor is transmitted to the winding shaft. As a result, the take-up shaft rotates in the rewinding direction, and the paper is taken up by the take-up shaft. When the leading end of the paper is located near the nip roller, the rotation of the winding shaft is stopped.
Next, the nip roller is rotated in a direction opposite to the photographic paper feeding direction, and the leading end of the photographic paper is discharged from the nip roller. In this manner, the first return in which the leading end of the paper is returned to the vicinity of the nip roller by the rotation of the take-up shaft, and after the first return, the nip roller is rotated in a direction opposite to the feeding direction to discharge the leading end of the photographic paper from the nip roller. Since the second feeding is performed, the paper return is always terminated at a fixed position where the leading end of the paper is discharged from the nip roller. Therefore, unlike the case where the paper is simply rewound by the winding shaft, the leading end of the paper is not rewound into the magazine,
There is no need to pull out the leading edge of the paper from the magazine at the next loading, and the paper can be easily reset.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a main part of a printer processor embodying the present invention.
In FIG. 2 and FIG.
10 is wound in a roll shape on a winding shaft 12 and stored in a magazine 13. A drive gear 14 is fixed to the winding shaft 12, and the drive gear 14 has a rotation gear 16 via an intermediate gear 15.
Are linked. Each of these gears 14, 15, 16 is a magazine
It is rotatably mounted in a concave portion 13A formed on the side of 13.

The magazine 13 is set in a magazine storage section 18 of a printer processor 17. A nip roller pair 20 is disposed in the magazine storage section 18 at a position close to the paper entrance 19 of the magazine 13, and a planet gear 21 is disposed at a position close to the rotating gear 16.

The nip roller pair 20 includes a lower roller 20A and an upper roller 20B urged downward by a coil spring 24 so as to resiliently contact the lower roller 20A. The upper roller 20B is attached to the nip release lever 25. The release lever 25 is in contact with an eccentric cam 27 attached to a nip release motor 26, and the eccentric cam 27 pushes the release lever 25 by the rotation of the motor 26. Thereby, the upper roller 20B is lifted upward, and the nip is released. The nip is released when the magazine is set, and the tip of the paper projecting from the magazine 13 can be easily held between the upper and lower rollers 20A and 20B. Note that the nip release may be performed by a solenoid instead of the motor 26 and the eccentric cam 27.

A drive gear 28 is fixed to the shaft end of the lower roller 20A, and the planetary gear 21 is selectively meshed with the drive gear 28 by the rotation of the arm 29. The planet gear 21 meshes with the sun gear 30, and the sun gear 39 is rotated by the auto load motor 32 via the timing belt 31. A rewind solenoid 33 and a coil spring 34 are attached to the arm 29. When the solenoid 33 is turned off, the coil spring 34
Thereby, the driving gear 28 of the nip roller pair 20 is set to the loading position where the planetary gear 21 meshes. When the solenoid 33 is turned on, the plunger is protruded and set to the rewind position where the planetary gear 21 meshes with the rotating gear 16 of the magazine 13. The rewind solenoid 33 is turned on.
Although a type in which the plunger protrudes is sometimes used, a type in which the plunger is retracted when turned on may be used. In this case, the rewind solenoid is mounted on the side opposite to the mounting position of the protruding type.

On the paper exit side of the nip roller pair 20, a first loop forming section 38 is provided. A movable guide 39 is disposed in the loop forming section 38, and the nip roller pair 20
Is guided to the paper transport path 40.
After this guidance, the movable guide is driven by the guide switching motor 41.
39 pivots downward to the retracted position, forming a space for the loop. The paper transport section 40 includes a guide roller 42 and paper guides 45 and 46. The paper transport section 40 changes the feed direction of the paper 10 by 90 ° from horizontal to vertical, and
Guide 10 to print position 48.

As shown in FIG. 2, a variable mask 50 of the printer unit 49 is disposed at the print position 48, and is configured to change the mask opening according to the width of the paper 10.
The image of the negative film 53 set on the film carrier 52 is formed on the paper 10 at the print position 48 by the printing lens 54 and the mirror 55. Negative film 53
Is illuminated by printing light from a light source 58 that has passed through a light quality control unit 56 and a diffusion box 57, as is well known. Further, the image of the negative film 53 is subjected to three-color separation photometry at each point by the scanner 59, and an exposure amount is calculated based on various characteristic values obtained from the photometric values. Then, based on the exposure amount, the light quality adjusting unit
The position of each filter 56 and the exposure time are obtained, and the light quality adjusting unit 56 and the shutter driving unit 60 are controlled based on the obtained positions.

As shown in FIG. 1, a well-known cut / sort marker 61 is disposed on the paper exit side of the variable mask 50, and a cut mark composed of a small hole is provided between the burn-exposed frames. Record the sort mark.

On the paper exit side of the cut / sort marker 61, a first paper feed unit 62 is arranged. The paper feed unit 62 includes a feed roller 63, a main feed motor 64 that rotates the feed roller 63, and a guide belt 65, and the unexposed paper fed by the nip roller pair 20.
10 is securely set at the print position 50, and the exposed paper 10 is conveyed from the print position 50 to the second loop forming section 67. The guide belt 65 is brought into contact with the feed roller 64 by / 4 rotation by three guide rollers 68, and changes the paper feed direction from a vertical direction to a horizontal direction.

A first cutter 75 that cuts the paper 10 between the frames is disposed on the paper exit side of the paper feeding unit 62. The cutter 75 cuts the paper 10 immediately after the printed frame when ending the printing operation or when replacing the paper 10 with another size or surface type.

As shown in FIG. 2, on the exit side of the first cutter 75,
A loop forming unit 77 for storing the print-exposed paper 10 in a loop is provided. The loop forming unit 77 absorbs the difference in processing speed between the printer unit 49 and the processor unit 78,
This is for smoothly feeding the paper 10 to the processor section 78, and includes a guide roller 79 and a movable guide 81 for guiding the leading end of the paper to the second paper feeding section 80 on the downstream side. After the movable guide 81 guides the leading edge of the paper to the second paper feed unit 80, the movable guide 81 turns downward to the retracted position,
Form a space for the loop.

The second paper feed section 80 is composed of a feed roller 82 and two guide rollers 83 that come into contact with the feed roller 82.
A second cutter is provided on the paper exit side of the second feeding section 80.
85 are located. The second cutter 85 is used when the printing operation is temporarily interrupted. This cutter 85
A third loop forming section 86 is disposed on the paper outlet side of the third loop. The third loop forming unit 86 is provided for increasing the paper cutting time so that the paper 10 can be continuously fed to the processor unit 78 even when the paper 10 is stopped at the time of cutting the paper. Guide 87 is provided. The movable guide 87 is in a vertical state when passing the paper leading end, and moves the paper leading end to the third paper feeding portion 90.
After this guidance, it will be in the horizontal evacuation position,
Form a space for the loop.

The third paper feed unit 90 includes a feed roller 91 and two guide rows 92 that come into contact with the feed roller 91. The feed roller 91 is driven by a paper transport system on the processor unit 78 side, and is set at the same transport speed as the transport system.

In the paper transport system described above, first, second, and third paper sensors D1, D2, and D3 for detecting paper are provided for paper feeding and rewinding. The first sensor D1 is disposed close to and downstream of the nip roller pair 20. Further, the second sensor D2 is provided on the paper transport path.
It is located close to and downstream of 40. Also, the third
The sensor D3 is disposed close to and downstream of the first paper feed unit 62.

Further, a loop sensor D4 for detecting that the loop has reached a predetermined length is disposed in the first loop forming section 38, and a guide opening sensor D5 for detecting the position of the movable guide 39 is provided. And a guide closing sensor D6.
Similarly, the other second and third loop forming portions 77 and 86 also have
Similarly, a loop sensor and a guide position detection sensor are arranged, but they are not particularly related to the paper rewinding of the present invention, and are not shown. Further, a nip release sensor D7 for detecting a nip release state is disposed near the nip release lever 25.

The signals from these sensors D1 to D7 are
Is input to The controller 100 is constituted by a known microcomputer, and includes a keyboard 101 and a display 102. And the controller 100
In accordance with a command input from the keyboard 101, the respective sections are sequence-controlled via the drivers 103 to 108 and the driving section 109 to perform paper feeding and rewinding.
And the processor unit 78.

Next, the operation of paper feeding and paper rewinding will be described.

First, the magazine 13 is set in the magazine storage section 18 of the printer processor 17. At this time, the upper roller 20B of the nip roller pair 20 is lifted upward, and these rollers 2
The paper tip is set between 0A and 20B.

Next, as shown in FIG. 3, when the magazine 13 is set, an auto load command is output, and the controller 100 first performs an initial setting. In this initial setting, the nip release motor 26 is turned on, the nip roller pair 20 is switched to the nip state, and the movable guides 39, 81, 87 of all the loop forming sections 38, 77, 86 are set to the guide positions, and further, With the rewind solenoid 33 turned off, the planetary gear 21 is engaged with the rotating gear 28 of the nip roller pair 20.

Next, the controller 100 rotates the auto load motor 32 forward, and pulls out the paper 10 from the magazine 13 by the nip roller pair 20. As a result, the leading end of the paper passes through the first sensor D1, and the first sensor D1 is turned on. Note that even if one second has elapsed since the motor 32 started rotating forward, the first
If the sensor D1 does not turn on, the controller 100 determines that paper feeding is impossible and displays an error.

Eventually, when the paper tip passes through the second sensor D2,
The second sensor D2 turns ON. If the sensor D2 does not turn on even after two seconds have passed after passing through the first sensor D1, the controller 100 determines that the paper is jammed and displays an error. When the second sensor D2 is turned on, the controller 100 operates the main feed motor 6 of the first paper feed unit 62.
Rotate 4 forward and feed the paper tip to cutter 75 side. By this feeding, when the leading edge of the paper passes through the third sensor D3 and turns it on, the controller 100 causes the auto load motor 3
2 and the rotation of the main feed motor 64 are stopped. In addition,
If the third sensor D3 does not turn on after 8 seconds from the start of forward rotation of the main feed motor 64, the controller
In the same manner as described above, 100 indicates that the paper is jammed and displays an error.

When the third sensor D3 is turned on, the controller 100 rotates the guide switching motor 41 to set the movable guide 39 from the guide position to the retracted position. When the movable guide 39 is set to the retracted position, the guide open sensor D5 turns ON,
Thus, the controller 100 rotates the auto load motor 32 forward. Therefore, a loop is formed in the first loop forming unit 38. When this loop reaches a predetermined length, the loop sensor D4 is turned ON, and for example, based on the detection of this ON,
After 1000 pulses, the controller 100
Stop two. Note that the loop sensor D4 remains O
If not, the controller 100 determines that the paper is jammed and displays an error.

In this manner, printing is started after the loop is formed by the first loop forming unit 38, and the image of the negative film 53 is printed and exposed on the paper 10 at the print position 48. At this time, as is well known, the three-color separation density of each point of the print target frame is measured by the scanner 59, and an appropriate exposure amount is calculated based on the photometry. After the printing exposure, the paper 10 is fed, and the exposed frame is discharged from the print position 48, and a new unexposed paper 10 is set at the print position 48. As a result of this frame feed, when the loop amount of the first loop forming section 38 is reduced and the loop sensor D4 is turned off, the controller 100 rotates the auto load motor 32 forward and feeds the paper 10 until the predetermined loop amount is reached. .
Hereinafter, the paper 10 is pulled out of the magazine 13 by this return and sent to the print position 48.

On the printed paper 10, a cut mark is displayed between each frame by the cut / sort marker 61.
A sort mark is recorded for each section of the order. Then, until the second loop forming unit 77 reaches a predetermined loop amount,
Paper 10 is stored. When the predetermined loop amount is reached, the leading edge of the paper is sent to the processor unit 78 by the second and third paper feeding units 80 and 90. At this time, a loop of a predetermined length is formed in the third loop forming section 86.

If printing is temporarily interrupted in the middle, the developing process is continuously performed in the processor unit 78.
77 loop amount is reduced. This decrease is detected by the loop sensor, whereby the controller 100 automatically operates the second cutter 85 to cut the paper 10 at the cut mark position. For this reason, even if the printing is temporarily suspended, the exposed paper is sent to the processor unit 78, so that the development processing in the processor unit is not interrupted.

When the printing operation is completed or when paper is replaced, the keyboard 101 is operated to input a rewind command. Thus, the controller 100 controls each unit according to the flowchart shown in FIG. First,
The controller 100 determines whether or not the printing has just been performed. If the printing has just been performed, the controller 100 performs a predetermined amount of paper feeding through the first feeding unit 62 and outputs the paper at the cut mark position.
Cut 10 The printed paper 10 after cutting is continuously sent to the processor unit 78 via the second and third paper feeding units 80 and 90, and is developed.

When a rewind command is input without performing printing after auto-loading or after the printed paper is cut, first, the controller 100 turns on the rewind solenoid 33, and as shown in FIG. The gear 21 is switched from the drive gear 28 on the nip roller pair 20 side to the rotating gear 16 on the magazine side. Next, the auto load motor
Reverse 32. By this reverse rotation, the first return is performed, and the paper 10 is wound around the winding shaft 12, so that the loop amount of the first loop forming section 38 is reduced. And the loop sensor D4
When the controller 100 is turned off, the controller 100 switches the first feeding unit 62 after two seconds.
The main feed motor 64 is rotated in reverse to rewind the paper 10 after the second feed section 62. Due to this rewinding, the leading end of the paper passes through the third sensor D3 and the sensor D3 is turned off.
When F is set, the controller 100 stops the reverse rotation of the main feed motor 64 two seconds after this OFF.

Eventually, the leading end of the paper passes through the second sensor D2, and this sensor D2 is turned off. Then, the autoloader motor 32 is turned off after 200 pulses of rotation based on the time when the second sensor D2 is turned off. As a result, the paper is rewound so that the leading end of the paper is located at a distance of 100 to 150 mm from the paper entrance 19 of the magazine 13, depending on the outer diameter of the paper roll at that time, and the first return is completed.

Next, the controller 100 operates the rewind solenoid 33.
After turning off the planetary gear 21 from the magazine 13 side to the nip roller pair 20 side, as shown in FIG. 6, the auto load motor 32 is reversely rotated 0.5 seconds after the rewind solenoid 33 is turned off. As a result, the nip roller pair
20 rotates in the paper rewind direction, and a second rewind of feeding the paper 10 into the magazine is performed. At this time,
The paper roll in the magazine 10 was fed into the magazine 13 in order to continue the rotation in the rewinding direction due to inertia at the time of rewinding even if the driving force of the auto load motor 32 was cut off by turning off the rewind solenoid 32. Paper 10
Are stored in a roll.

Eventually, the paper feed by the reverse rotation of the nip roller pair 20 causes the leading edge of the paper to pass through the first sensor D1 and
When the motor is turned OFF, the motor is turned OFF after the auto-load motor 32 is rotated backward by 68 pulses with respect to the time when the motor is turned OFF. As a result, the second rewinding in which the paper rewinding is stopped with the leading end of the paper removed from the nip roller pair 20 ends. Next, the controller 100 sets the movable guide 38
To the guide position.

As described above, the first rewinding is performed by rewinding the winding shaft 13 to the position where the leading end of the paper is away from the paper entrance 19 of the magazine 100 by 100 to 150 mm, and subsequently, the inertia at the time of rewinding the paper roll and The two-stage configuration of the nip roller pair 20 and the second return by forcible feeding of the paper into the magazine ensures that the paper is wound into the magazine. Moreover, by setting the distance so that the paper feed by the nip roller pair 20 is finished at the time when the inertia at the time of rewinding the paper roll is lost, paper rewind more than necessary due to the inertia is prevented from being performed, The paper tip is prevented from being wound into the magazine by inertia.

When the third sensor D3 is not turned off even after one second has elapsed after the reverse rotation of the main feed motor 64, or when the second sensor D2 has been stopped for 20 seconds after the main feed motor 64 stops the reverse rotation. If it does not turn off, furthermore, after turning off the rewind solenoid 33,
If the first sensor D1 is not turned off after 2 seconds from the reverse rotation of the controller 2, the controller 100 determines that rewinding is impossible and displays an error. FIG. 7 shows a timing chart of each part at the time of rewinding described above.

In the above embodiment, when the leading edge of the paper comes to a position 100 to 150 mm away from the nip roller pair 20, the second sensor is arranged to detect this, and the switching timing of the rewind solenoid 33 is obtained. The position of the sensor is not limited to this, and is determined in consideration of the inertia of the paper roll of the magazine 13 and the rewinding drive system. That is, when the leading end of the paper is removed from the nip roller pair, the arrangement position of the sensor D2 is determined according to the size of the paper roll stored in the magazine so that the inertia of the paper roll or the like is already lost.

Further, in the second winding, the end of the paper feeding into the magazine 13 by the nip roller pair 20 and the end of the inertia region of the paper roll at the time of rewinding do not necessarily need to be matched, and the inertia region ends. After that, paper feeding may be continued by the nip roller pair 20 as long as there is room in the magazine.

Further, in the above embodiment, the switching of the planetary gear 21 is performed by the rewind solenoid 33, but the switching may be performed by a motor. In addition, a DC motor, an AC motor, or the like may be used for each motor in addition to the pulse motor. In addition, although the motor is pulse-controlled, time control may be used instead.

Further, in the above embodiment, the printer processor that sends the paper to the print position that holds the paper in the vertical direction,
Although the present invention is embodied, the present invention may also be embodied in a case where the paper is sent to a print position where the paper is held in a horizontal state. Further, the present invention may be applied to a printer alone or a printing-related device using several types of roll paper in addition to the printer processor.

〔The invention's effect〕

As described above, according to the present invention, since the driving force of one motor is selectively transmitted to the nip roller and the winding shaft of the magazine by the transmission mechanism, paper feeding and paper rewinding into the magazine can be performed. Is possible with one motor. In addition, after the first return by rotation of the winding shaft in the rewind direction, the second return is performed in which the nip roller is rotated in the reverse direction to return the paper. Accuracy can be increased. That is, according to only the first return, the roll diameter is different when the remaining amount of paper is different, so that the film withdrawal amount is different, and the film withdrawal stop position varies. Therefore, the film tip may be pulled back into the magazine.In this case, it is necessary to take the film tip out of the magazine when resetting, which is troublesome, but such a problem can be eliminated. . Further, the positioning accuracy of the leading end of the paper can be further improved without being affected by the inertia of the paper roll generated by the first return. Moreover, since the second return is performed by reversing the nip roller,
When the leading end of the paper is discharged from the nip roller, the paper is not returned any more, and the leading end of the paper can always be returned to a fixed position. Paper return position accuracy can be improved. In addition, since the paper feeding and rewinding can be automated, the operator can perform other operations during the rewinding operation, thereby improving the efficiency. Further, since the manual operation buttons and the like can be eliminated by automation, it is possible to prevent erroneous operation of the rewinding operation without touching them erroneously.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a main part of a photographic paper transport device of a photographic printing machine according to the present invention. FIG. 2 is a schematic view showing the entire configuration of the photoprinting machine. FIG. 3 is a flowchart showing a processing procedure of the controller at the time of paper feeding. FIG. 4 is a flowchart showing a processing procedure of the controller at the time of paper rewinding. FIG. 5 is a front view showing a first paper winding state. FIG. 6 is a front view showing a second paper winding state. FIG. 7 is a timing chart at the time of paper winding. 10 Paper 12 Winding shaft 13 Magazine 20 Nip roller pair 21 Planet gear 25 Nip release lever 32 Auto load motor 33 Rewind solenoid 38, 77, 86 Loop formation Unit 39,81,87… Movable guide 49… Printer unit 62,80,90… Paper feeding unit 75,85… Cutter 78… Processor unit D1-D3… Sensor D4… Loop sensor.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-167834 (JP, A) JP-A 63-39225 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03B 27/58

Claims (3)

(57) [Claims] 1. A photographic paper winding method for winding a photographic paper fed from a magazine having a winding shaft by a nip roller toward a magazine side, wherein the photographic paper is wound so that a leading end of the photographic paper is positioned close to the nip roller. A first return to return the photographic paper by rotation, after the first return, stop the rotation of the winding shaft, rotate the nip roller in a direction opposite to the photographic paper feeding direction,
A second return for discharging the leading end of the photographic paper from the nip roller. 2. A photographic paper transport device for a photographic printing machine provided with a motor for rotating a take-up shaft in a magazine in a take-up direction, the nip roller changing the direction of rotation and feeding and returning the photographic paper. A transmission mechanism for selectively transmitting the force of the motor to the nip roller and the winding shaft; and rotating the winding shaft in the winding direction to return the leading end of the printing paper to a position close to the nip roller and stop. A photographer comprising a controller for performing a first return, and after the first return, rotating the nip roller in the return direction by a transmission mechanism and performing a second return for discharging the leading end of the photographic paper from the nip roller. Printing paper transport device for printing machines. 3. A sensor for detecting the passage of the leading edge of the photographic paper is provided on the upstream side of the nip roller in the photographic paper returning direction. 3. The photographic paper transport device for a photographic printing machine according to claim 2, wherein the leading end of the photographic paper is stopped near the nip roller.