WO2008023475A1

WO2008023475A1 - Paper feeding device

Info

Publication number: WO2008023475A1
Application number: PCT/JP2007/057427
Authority: WO
Inventors: Masaya Ishimoto; Masahiro Ogura
Original assignee: Duplo Seiko Corporation
Priority date: 2006-08-25
Filing date: 2007-04-03
Publication date: 2008-02-28
Also published as: CN101472817B; CN101472817A; WO2008023475A8; JP2008050135A; JP4550032B2

Abstract

Provided is a paper feeding device (2) comprising a paper feed bed (24) capable of moving in a direction orthogonal to the feeding direction of paper sheets (101), moving means for moving the paper feed bed in the orthogonal direction, a paper feed tray (22) placing the paper feed bed thereon and made vertically movable, vertically moving means for moving up and down the paper feed tray, paper separating means (21) including a paper feed roller (211) and for separating and feeding the paper sheets stacked on the paper feed beds one by one, movement instruction inputting means for inputting an instruction to move the paper feed bed by an arbitrary extent in the orthogonal direction, and movement control means for controlling the action of the moving means on the basis of the instruction inputted by the movement instruction inputting means. The paper feeding device (2) is characterized by further comprising paper feed roller refuge means for causing the paper feed roller to take refuge thereby to release the contact with the uppermost one of the paper sheets stacked on the paper feed bed.

Description

Specification

Paper feeder

Technical field

The present invention relates to a paper feeding device that feeds stacked sheets one by one from the top to the next stage, and in particular, changes the position of the stacked sheets in a direction perpendicular to the supply direction. The present invention relates to a paper feeding device.

Background art

[0002] Patent Document 1 discloses a paper feeding device that supplies stacked sheets one by one from the top to the next stage. In this paper feeding device, before the paper is supplied to the next stage, the paper feeding table on which the paper is stacked can be moved by an arbitrary amount in a direction orthogonal to the supply direction. Patent Document 1: Japanese Patent Laid-Open No. 2000-264448

Disclosure of the invention

Problems to be solved by the invention

[0003] In the paper feeding device of Patent Document 1, before moving the paper feeding table in the orthogonal direction, the paper feeding table is used to release the contact between the uppermost paper and the paper feeding roller. Lowering. That is, the sheet feed table is moved in the orthogonal direction after being lowered. Therefore, the paper feeder disclosed in Patent Document 1 has a problem that it takes time to complete the movement of the paper feed table in the orthogonal direction.

[0004] Further, in the paper feeder of Patent Document 1, the paper feeder is lowered, so depending on the amount of paper loaded, the paper feeder is detected by the lower limit sensor, and an operation error is determined. In order to cancel, it was necessary to remove some of the loaded paper. For this reason, there was a problem that the work efficiency was lowered.

[0005] Further, a paper feed separating means for separating and feeding the sheets stacked on the paper feed sheet one by one from the top. Power feed roller, and frictional separation biased to contact the paper feed roller from below In the case where both the member and the force are in force, the next sheet to be fed out remains sandwiched between the sheet feeding roller and the friction separating member. Then, the sandwiched paper does not descend even when the paper feed table is lowered as in the paper feeding device of Patent Document 1, and therefore the paper feed table is placed in the orthogonal direction. Even if it is moved in the direction, it will not move, so if the paper feeder is operated in that state, there was a risk of jamming.

[0006] The present invention provides a sheet feeding device that can complete the movement of the sheet feeding table in the orthogonal direction in a short time and can prevent a reduction in work efficiency due to an operation error. It aims to.

Means for solving the problem

[0007] The present invention is a sheet feeding device that supplies stacked sheets one by one from the top to the next stage, and is capable of stacking sheets and moving in a direction orthogonal to the supply direction. A table, a moving unit for moving the sheet feeding table in the orthogonal direction, a sheet feeding table on which the sheet feeding table is mounted and which can be moved up and down, a lifting unit for moving up and down the sheet feeding tray, and a sheet feeding roller Input paper separation means and instructions to move the paper feed base by an arbitrary amount in the orthogonal direction. In the paper feeding device, which includes a movement instruction input means and a movement control means for controlling the operation of the movement means based on an instruction input by the movement instruction input means, To release contact with the topmost paper loaded in the It is characterized in that it is provided with means for retracting the paper feeding port and the roller.

[0008] The present invention preferably further adopts the following specific configuration.

[0009] (i) The movement control means operates the moving means after retracting the paper feed roller by the paper feed roller retracting means.

(Ii) The paper feed roller retracting means is configured to rotate the entire rotary shaft up and down with one end of the rotary shaft of the paper feed roller as a fulcrum.

[0011] (iii) The paper feed separating means includes a friction separating member biased so as to abut against the paper feeding roller in a downward force, and the friction separating member is disposed between the retracted paper feeding roller. The biasing is controlled so as to keep the gap in the gap.

(Iv) The movement instruction input means has a movement instruction key for setting a movement direction and a movement amount at the same time.

The invention's effect

According to the present invention, by retracting the paper feed roller by the paper feed roller retracting means, Since the contact with the uppermost sheet of paper stacked with the paper feed roller can be released, the paper feed base can be moved without lowering the paper feed tray on which the paper stack with paper loaded is placed. It can be moved in a direction perpendicular to the paper supply direction. Therefore, the following effects can be exhibited.

(1) Since the paper feed tray can be moved without lowering the paper feed tray, the time required to complete the movement of the paper feed tray is the same as the time required to lower the paper feed tray. Can be reduced. Therefore, the movement of the sheet feeding table in the orthogonal direction can be completed in a short time.

(2) Since there is no need to lower the paper feed tray, the paper feed tray is not detected by the lower limit sensor and judged as an operation error. Therefore, it is possible to prevent a reduction in work efficiency due to the need for work to cancel the operation error.

[0014] According to the above configuration (i), since the paper feed roller is moved after the contact with the uppermost paper that is stacked with the paper feed roller is released, the paper feed stand is loaded. You can move it with the paper you are sure.

[0015] According to the configuration (ii), the paper feed roller can be easily and reliably retracted.

[0016] According to the configuration (iii), in the case where the paper feed separating unit is composed of a paper feed roller and a friction separating member, the paper feed roller is used as the uppermost sheet of stacked sheets, that is, Since the paper sandwiched between the paper feed roller and the frictional separation member can be retracted, the paper feed table is placed on the paper sandwiched between the paper feed roller and the frictional separation member and loaded. It can be moved reliably with the paper that is on.

[0017] According to the configuration (iv), since the movement direction and movement amount of the paper feed table can be set by a simple operation, workability can be improved.

Brief Description of Drawings

FIG. 1 is a schematic longitudinal sectional view showing an image forming apparatus provided with a paper feeding device of the present invention.

FIG. 2 is an enlarged partial view of the sheet feeding device of FIG.

FIG. 3 is a view on arrow III in FIG.

FIG. 4 is an overall perspective view of a paper feed tray and a paper feed table.

FIG. 5 is a perspective plan view of a paper feed tray and a paper feed table. FIG. 6 is a further perspective plan view of the paper feed tray and paper feed table.

FIG. 7 is a perspective rear perspective view of a paper feed tray and a paper feed table.

FIG. 8 is a perspective view showing a paper feed roller support mechanism of the paper feed separating means.

FIG. 9 is a longitudinal sectional view of a shaft rotation fulcrum.

FIG. 10 is a schematic front view showing how the sheet feeding roller and the rotating shaft rotate.

FIG. 11 is a lower perspective view of the friction separating member.

FIG. 12 is a diagram showing movement instruction keys displayed on the operation panel.

FIG. 13 is a diagram showing a printing speed setting key on the operation panel.

Explanation of symbols

[0019] 101 paper

2 Paper feeder

21 Paper separation means

211 Feed roller

212 Friction separating member

213 axis of rotation

22 Feed tray

23 Lifting means

24 Paper feeder

31 axis fulcrum

41 Movement instruction key

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a schematic longitudinal sectional view showing an image forming apparatus provided with a sheet feeding device of the present invention.

In the image forming apparatus 1, the paper feeding device 2 supplies the stacked paper sheets 101 one by one from the top to the next stage. An arrow X indicates the supply direction of the paper 101. In the image forming apparatus 1, the paper 101 supplied from the paper feeding device 2 passes through a pair of upper and lower conveying rollers 11, an image forming unit 12, and a paper discharge belt 13 that is stretched around a paper discharge roller 131. The paper is discharged to the paper output unit 14. At this time, the image forming unit 12 prints an image on the sheet 101.

FIG. 2 is an enlarged partial view of the sheet feeding device 2 of FIG. This paper feeder 2 is loaded A sheet feeding / separating means 21 is provided for separating and feeding the sheets 101 one by one from the top. The paper feed separating means 21 includes a paper feed roller 211 and a friction separation member 212 urged so as to come into contact with the paper feed roller 211 from below.

FIG. 3 is a view taken along arrow III in FIG. In FIG. 3, the paper 101 is not shown. The paper feed roller 211 is fixed to the rotary shaft 213. Here, three paper feed rollers 211 are provided in the central portion of the rotation shaft 213 in the axial direction. The rotating shaft 213 is rotatably supported by both side walls 191 and 192 of the image forming apparatus 1 at both ends thereof.

The paper feeding device 2 includes a paper feeding tray 22. The paper feed tray 22 is supported at both edge portions thereof on both side walls 191 and 192 of the image forming apparatus 1 so as to be movable up and down.

Further, the paper feeding device 2 includes an elevating unit 23 that raises and lowers the paper feeding tray 22. The lifting / lowering means 23 has a force and a sprocket 231 arranged at the upper and lower parts, an annular belt 232 stretched over both sprockets 231, a motor (not shown) for driving the sprocket 231. Both edge portions of the paper feed tray 22 are fixed to the belt 232 through vertical long holes 233 formed in both side walls 191 and 192. Thus, the paper feed tray 22 is moved up and down along the long hole 233 by driving the sprocket 231 by the motor and rotating the belt 232.

FIG. 4 is an overall perspective view of the paper feed tray 22 and the paper feed table 24. A paper feed tray 24 on which a large number of paper sheets 101 are stacked is placed on the paper feed tray 22. The paper feed tray 24 includes a main body portion 241 that overlaps the paper feed tray 22 and an overhang portion 242 that projects forward from the main body portion 241. The overhang portion 242 is rotatably provided at a connecting portion 243 with the main body portion 241. On the main body 241, two guide plates 24 4 and 245 are installed to guide both edges of the paper 101 to be placed.

FIG. 5 is a perspective plan view of the paper feed tray 22 and the paper feed table 24, and shows the main body 241 through. The two guide plates 244 and 245 are movable in a direction perpendicular to the arrow X direction (arrow Y direction). FIG. 5 shows the moving means. The two guide plates 244 and 2 45 are fixed to racks 2442 and 2452 that can slide along rails 2441 and 2 451 that extend and are fixed to the main body 241 in the arrow Y direction, respectively. . The racks 2442 and 2452 are opposed to each other with the pinion 2443 interposed therebetween. As a result, the guide plate 24 When 4 is picked by the lever 2444 and slid inward along the rail 2441, the guide plate 245 also slides inward along the rail 2451 by the same distance. When the guide plate 244 is slid outward along the rail 2441, the guide plate 245 is also slid outward along the rail 2451 by the same distance. Accordingly, the distance between the two guide plates 244 and 245 can be freely changed.

FIG. 6 also shows the force main body 241 that is a perspective plan view of the paper feed tray 22 and the paper feed table 24 in a more transparent manner than in the case of FIG. FIG. 7 is a perspective rear perspective view of the paper feed tray 22 and the paper feed table 24. The paper feed tray 24 can be moved in the arrow Y direction on the paper feed tray 22. That is, FIG. 6 and FIG. 7 show the moving means of the paper feed table 24. The moving means includes a horse ward movement shaft 221, a motor 222, an insect accumulation rod 223, two slides, shafts 224 and 225, and a movement amount detection sensor 226.

[0028] The drive screw shaft 221 is provided in the center in the arrow X direction of the paper feed tray 22 so as to extend in the arrow Y direction. One end of the drive screw shaft 221 is rotatably fixed to the side wall 228 of the paper feed tray 22. The motor 222 is provided at the other end of the drive screw shaft 221 so as to rotate the drive screw shaft 221. The screwing part 223 is fixed to the side wall 2418 of the main body part 241 of the paper feed table 24. The drive screw shaft 221 is screwed into the screwing part 223 and passes through the screwing part 223. The slide shafts 224 and 225 are provided on the paper feed tray 22 in parallel with the drive screw shaft 221 on both sides of the drive screw shaft 221. As a result, when the motor 222 is operated to rotate the drive screw shaft 221, the screwing portion 223 moves on the drive screw shaft 222 while rotating relative to the drive screw shaft 221. Moves on the paper feed tray 22 along the slide shafts 224 and 225.

The movement amount detection sensor 226 includes a disk 2261 that rotates with the rotation of the drive screw shaft 221 and a slit counter 2262. The disc 2261 has a large number of slits at regular intervals on the periphery thereof, and the slit counter 2262 obtains the number of slits passing through the counter portion. As a result, the amount of rotation of the drive screw shaft 221, that is, the amount of movement of the screwing portion 223, that is, the amount of movement of the paper feed table 24 is detected.

FIG. 8 shows a support mechanism for the paper feed roller 211 of the paper feed separating means 21. One end 2131 of the rotation shaft 213 of the paper feed roller 2 11 constitutes a shaft rotation fulcrum 31, and the image forming apparatus 1 side Supported by wall 192. The other end 2132 of the rotating shaft 213 is supported on the side wall 191 of the image forming apparatus 1 so as to be movable up and down.

FIG. 9 is a longitudinal sectional view of the shaft rotation fulcrum 31. The shaft rotation fulcrum 31 includes one end 21 31 of the rotation shaft 213, a spherical shaft portion 311 rotatably supported by the side wall 192, a connection ring 312 connecting the one end 2131 and the shaft portion 311, and a shaft portion 311. And a connection pin 312, and a fixing screw 314 that connects one end 2131 and the connection ring 312. The connection ring 312 is externally fitted to the shaft portion 311, and the roll pin 313 is inserted into the shaft portion 311 through one side force of the connection ring 312. A gap 3131 is provided between the roll pin 313 and the connection ring 312. The roll pin 313 is a pipe-like pin, has a slit in the axial direction, and is urged in the diameter expansion direction. The connection ring 312 is also fitted to the one end 2131, and the fixing screw 314 is fixed through the both. Thus, in the shaft rotation fulcrum 31, the shaft portion 311 is spherical, and the roll pin 31 3 is provided with a gap 3131, so that the connection ring 312 is an arrow with the shaft portion 311 as a fulcrum. It can be rotated in the R direction. That is, in the shaft rotation fulcrum 31, the rotation shaft 213 can rotate in the arrow R direction with the shaft portion 311 as a fulcrum.

As shown in FIG. 8, the other end 2132 of the rotating shaft 213 is supported by one end 3221 of a reno 322 having a fulcrum 321 as a rotation center. The other end 3222 of the reno 322 is connected to the drive shaft 324 of the solenoid 323. Thus, when the solenoid 323 is activated and the drive shaft 324 is retracted, the other end 3222 force S of the reno 322 is lowered, one end 3221 force of the lever 322 is raised, and the other end 2132 of the rotating shaft 213 is raised. Further, when the solenoid 323 is actuated to advance the drive shaft 324, the other end 2132 of the rotating shaft 213 is lowered.

That is, as shown in FIG. 10, the rotating shaft 213 is rotated up and down around the shaft rotation fulcrum 31 by moving the other end 2132 up and down. That is, this constitutes a paper feed roller retracting means.

FIG. 11 is a lower perspective view of the friction separating member 212. The friction separating member 212 includes a contact member 2121 that contacts the paper feed roller 211 from below, a rod portion 2122 that extends downward from the contact member 2121 through the cradle 2127, and the rod portion 2122 upward. And a support portion 2123 for supporting in an energized state. The support portion 2123 includes a cradle 2127 and a restriction portion 2126. It has one. The rod portion 2122 is urged upward (in the direction of arrow Z) by a spring 2124. The spring 2124 has one end connected to the piece 2128 of the support 2123 and the other end connected to the piece 2129 of the rod 2122. FIG. 11 shows a state before the other end of the spring 2124 is connected to the piece 2129 of the rod 2122. A screw portion 2125 is fixed to the lower end of the mouth portion 2122. The rod portion 2122 is restricted in the upward movement distance by the screw portion 2125 coming into contact with the restriction portion 2126 of the support portion 2123 from below. That is, the abutting member 2121 is restricted from being biased upward. Accordingly, the abutting member 2121 moves upward as the paper feed roller 211 rotates upward, but does not move upward beyond a limited moving distance. The limited moving distance is set so as to secure a gap of 1 mm or more between the paper feed roller 211 and the paper feed roller 211 when the paper feed roller 211 moves to the maximum extent. In other words, the abutting member 2121 is restricted from being biased upward so as to maintain a clearance of 1 mm or more between the retracted paper feed roller 211.

FIG. 12 shows a movement instruction key 41 displayed on a liquid crystal display screen of an operation panel (not shown). The operation panel has setting keys for inputting various settings. When the setting keys are pressed, keys corresponding to the various settings are displayed on the liquid crystal display screen, and the print position key is pressed. Then, a schematic plan view of the movement instruction key 41 and the sheet 101 as shown in FIG. 12 is displayed. Here, the movement instruction key 41 moves and moves the paper 101 in one of the arrow X direction, the counter arrow X direction, the arrow Y direction (arrow Y1 direction), and the other in the arrow Y direction (arrow Y2 direction). Keys 411, 412, 413, 414 are provided for entering the quantity. The directions of arrow Y1 and arrow Y2 are shown in FIGS.

[0036] Further, the sheet feeding device 2 includes a control unit (not shown) for controlling the operation thereof. The operation panel is connected to the control unit. The control unit includes a movement control unit that controls the movement unit of the paper feed table 24 based on an instruction input by the movement instruction key 41.

[0037] Next, the operation will be described.

The paper feeding device 2 of the present invention has a case where the input by the movement instruction key 41 is accepted during the printing operation and a case where the operation is performed without being accepted during the printing operation. [0038] [When input by movement instruction key 41 is accepted during printing]

When the printing position key on the operation panel is pressed while the image forming apparatus 1 is in operation, the paper supply apparatus 2 operates sequentially from the next (i) to (vii) while being controlled by the control unit. .

(i) Detecting whether or not the printing operation is in progress. If the printing operation is in progress, the operation proceeds to the next (ii). If the printing operation is not in operation, the operation proceeds to (iii) without proceeding to (ii).

(ii) The operation of the paper feed roller 211 of the paper feed separating means 21 is stopped.

(iii) Operate the paper feed roller retracting means. That is, the rotation shaft 213 is rotated upward with the shaft rotation fulcrum 31 as a fulcrum. As a result, the paper feed roller 211 is withdrawn from the uppermost paper 101 stacked on the paper feed tray 24. At this time, the contact member 2121 of the friction separating member 212 moves slightly upward following the retracted paper feed roller 211, but a clearance of 1 mm or more is secured between the paper feed roller 211 and the contact member 2121. Stop at the position you want.

[0039] (iv) In response to an input from the movement instruction key 41, the movement direction and movement amount of the paper feed tray 24 are set. Specifically, this setting is performed as follows.

That is, for example, when the key 413 in the movement instruction key 41 is pressed once and released, the display of the Ml portion in FIG. 12 changes from “0. Omm” to “0.5 mm”. This indicates that the paper feed base 24 is moved 0.5 mm in the direction of the arrow Y1. If the key 413 is held down, the number displayed in the Ml part is incremented by 0.5 mm in proportion to the length of the pressed time. For example, 0.5 mm is added every time the pressing time is 300 milliseconds. Therefore, when the key 413 is pressed for 1 second, the display of the Ml part is “1.5 mm”. This means that the paper feed tray 24 is moved 1.5 mm in the direction of the arrow Y1. When the key 414 is pressed, the amount of movement in the arrow Y2 direction is set in the same manner. If one key 413 (or key 414) is pressed too much and the displayed moving amount becomes too large, the other key 414 (or key 413) is continuously pressed to move the moving amount. Can be reduced. For example, if the key 413 is pressed down and the movement force in the direction of the arrow Y1 becomes “2. Omm”, and you want to set it to “1.5 mm”, you can continue to press and release the key 414 once. Finally, when the OK key in FIG. 12 is pressed, the moving direction and moving amount determined by the keys 413 and 414 are set.

[0040] (V) The paper feed table 24 is moved based on the set moving direction and moving amount! Snow That is, when the set movement direction is the arrow Yl direction, the motor 222 rotates the drive screw shaft 221 in one direction so that the screwing portion 223 moves on the drive screw shaft 221 in the arrow Y1 direction. . When the set moving direction is the arrow Y2 direction, the motor 222 rotates the drive screw shaft 221 in the other direction. Further, the rotation amount of the motor 222, that is, the rotation amount of the drive screw shaft 221 is limited based on the set movement amount. The restriction is performed by the movement amount detection sensor 226 detecting the rotation amount, the control unit receiving the detection signal, and the control unit stopping the motor 222. In this way, the paper feed tray 24 is moved by the set movement amount in the set movement direction.

(Vi) Cancel the paper feed roller retracting means. That is, the rotation shaft 213 is rotated downward with the shaft rotation fulcrum 31 as a fulcrum, and the sheet feed roller 211 is brought into contact with the uppermost sheet 101 loaded on the sheet feed table 24.

(vii) The operation of the paper feed roller 211 is started. As a result, the sheet 101 is supplied to the next stage from a position moved by a predetermined amount in the direction of the arrow Y1 or the direction of the arrow Y2.

[0042] [When input by movement instruction key 41 is not accepted during printing operation]

When the printing position key on the operation panel is pressed while the image forming apparatus 1 is in operation, the paper feeding apparatus 2 operates sequentially from the next (a) to (f) while receiving control from the control unit. .

(a) Detecting whether or not the printing operation is in progress. When the printing operation is in progress, the input by the movement instruction key 41 is not accepted and the printing operation is continued. If printing is not in progress, go to (b).

(b) As in (iv) above, the movement direction and movement amount of the paper feed tray 24 are set in response to an input from the movement instruction key 41.

(c) When the print key on the operation panel is pressed, the paper feed roller retracting means is operated as in (iii) above.

(d) As in (V) above, the paper feed base 24 is moved based on the set movement direction and movement amount.

(e) Cancel the paper feed roller retracting means as in (vi) above.

(f) Start the printing operation. That is, the sheet 101 is supplied to the next stage from the position moved by a predetermined amount in the direction of the arrow Y1 or the direction of the arrow Y2 by the sheet feeding device 2 and printed. [0043] According to the sheet feeding device 2 of the present invention, the following operational effects can be exhibited.

(1) By retracting the paper feed roller 211 by the paper feed roller retracting means, the contact between the paper feed roller 211 and the uppermost paper of the stacked paper 101 can be released, so the paper feed tray 22 is not lowered. However, it is possible to move the paper feed tray 24 in the arrow Y direction. Therefore, the following effects can be exhibited.

(i) Since the paper feed tray 24 can be moved without lowering the paper feed tray 22, the time required to complete the movement of the paper feed tray 24 is the time required to lower the paper feed tray 22. It can be reduced by minutes. Therefore, the movement of the paper feed tray 24 in the arrow Y direction can be completed in a short time.

(ii) Since there is no need to lower the paper feed tray 22, the paper feed tray 24 is not detected by the lower limit sensor and judged as an operation error. Therefore, it is possible to prevent a decrease in work efficiency due to the need for work to cancel the operation error.

[0044] (2) Since the paper feed table 24 is moved after the contact between the paper feed roller 211 and the uppermost paper 101 of the loaded paper 101 is released, the paper feed table 24 is loaded. The paper 101 can be moved with certainty.

(3) Since the configuration and operation of the sheet feed roller retracting means are simple, the sheet feed roller 211 can be retracted easily and reliably.

(4) In the case where the paper feed separating means 21 is composed of the paper feed roller 211 and the friction separating member 212, the paper feed roller 211 is loaded as shown by the one-dot chain line in FIG. The sheet 101 can be retracted from the uppermost sheet 101 of the sheet 101, that is, the sheet 101 sandwiched between the sheet feeding roller 211 and the contact member 2 121 of the friction separating member 212. Is sandwiched between the paper feed roller 211 and the abutting member 2121, and can be reliably moved together with the paper 101 and the stacked paper 101.

[0047] (5) Since the movement direction and movement amount of the paper feed tray 24 can be set by a simple operation of simply depressing the movement instruction key 41, workability can be improved.

[0048] It should be noted that the present invention can be applied even when the paper feed separating means is of the separation roller separation type. Here, the separation roller separation system consists of a paper feed roller and a reverse roller, and when the paper is overlapped between the two rollers, the lower paper is rotated in reverse. In this way, the paper is prevented from being fed while being overlapped by being fed back by the printer.

[0049] [About another technology]

The present inventors have further obtained the following technique in the stencil printing apparatus, and will be described here. The technology relates to the relationship between the speed of the printing drum and the speed of the paper discharge belt. The printing drum performs printing on the paper that has been fed, and the paper discharge belt places the printed paper onto the paper discharge tray. The paper discharge belt is stretched between at least two paper discharge rollers and moves at a linear speed corresponding to the rotation speed of the paper discharge rollers.

[0050] (Background technology and its problems)

Conventionally, the rotation speed of the printing drum has been set in five stages from the first speed to the fifth speed. In other words, the printing speed was set to 5 levels. However, in recent years, there has been a demand for further increase in printing speed, and the sixth speed, which is faster than the fifth speed, has been set.

Incidentally, in the conventional case where the printing speed is five stages, the linear speed of the paper discharge belt is set to be the same for all the stages of the printing speed. Therefore, it has been proposed to set the linear speed of the paper discharge belt to be the same as the speed set for the conventional 1st to 5th speeds even when the printing speed is the 6th speed. However, in that case, the linear velocity of the paper discharge belt in the sixth speed is too low, and in the sixth speed, the paper to be printed does not peel off from the print drum and the paper rolls up. The problem is getting serious.

[0052] Therefore, in order to eliminate the roll-up of the paper, the linear speed of the paper discharge belt is the same at the first speed to the sixth speed, but larger than the conventional five stages, was suggested. However, in this case, the linear velocity of the paper discharge belt in the first speed is too high, and in the first speed, the discharged paper strongly collides with the strobe of the paper discharge tray. In addition, there is a problem that the paper is not aligned correctly because it collides with the next paper ejected.

[0053] The technique described below can solve the above problems.

[0054] (Technical content) 1.For 1st to 5th speed

a.About the printing drum

The printing speed, that is, the rotation speed of the printing drum is set using the printing speed setting key on the operation panel. As shown in FIG. 13, the printing speed setting key 45 includes five LEDs 451 to 455 arranged side by side, and an acceleration key 45A and a deceleration key 45B on both sides thereof. The initial speed display is set to 3rd speed, for example, according to user specifications.

[0055] Then, the operation for setting the speed at the start of printing is as follows. That is, for example, in order to set the fifth speed, the speed increasing key 45A is pressed twice to light the LED 455. Then, the rotation speed of the printing drum is increased in two steps, from 1st speed → 3rd speed → 5th speed. For example, to set the first speed, the LED 451 may be turned on by pressing the deceleration key 45B twice. Then, the rotation speed of the printing drum becomes the first speed.

Further, the operation when changing the speed during printing is as follows. That is, for example, when changing to the fifth speed when printing at the third speed, the LED 455 may be lit by pressing the speed increasing key 45A twice. Then, the rotation speed of the printing drum is increased in two steps, from the 3rd speed to the 5th speed. Also, for example, when changing to the first speed when printing at the third speed, the LED 451 may be turned on by pressing the deceleration key 45B twice. Then, the rotation speed of the printing drum is decelerated in two steps, from 3rd speed to 1st speed.

[0057] b. Output belt

The linear speed of the paper discharge belt is always maintained at a constant speed (referred to here as A speed). That is, even if the acceleration key 45A or the deceleration key 45B is pressed, the linear velocity of the paper discharge belt does not change.

[0058] 2. For 6th speed

a.About the printing drum

The printing speed, that is, the rotation speed of the printing drum is set to the sixth speed by using a sixth speed setting key provided on the operation panel separately from the printing speed setting key 45.

When setting the 6th speed at the start of printing, press the 6th speed setting key. Good. Then, the rotation speed of the printing drum is increased in 2 steps, from 2nd speed → 4th speed → 6th speed.

In addition, when printing at any one of the first speed to the fifth speed, the 6th speed setting key may be pressed when changing to the 6th speed. For example, when printing at the 1st speed, if the 6th speed setting key is pressed, the rotation speed of the printing drum increases from 1st speed → 3rd speed → 5th speed → 6th speed. It is done.

[0059] b. Paper ejection belt

The linear speed of the paper discharge belt is maintained at the above-mentioned A speed while the rotation speed of the printing drum is increased between the first speed to the fifth speed, and the rotation speed of the printing drum becomes the sixth speed. Sometimes it is increased to a speed greater than the A speed (referred to herein as the B speed). That is, in the case of the sixth speed, the linear speed of the paper discharge belt is the B speed that is larger than the A speed.

[0060] According to the above technique, the linear velocity force of the discharge belt in the case of the sixth speed is set larger than the linear velocity of the conventional discharge belt in the case of the first speed to the fifth speed. The following effects can be demonstrated.

(1) Since the linear speed of the paper discharge belt in 6th speed is never too small, even in 6th speed, the printed paper will not peel off well from the printing drum and will not roll up. Absent.

(2) Since the linear velocity of the paper discharge belt in the first speed is never too high, the paper discharged in the first speed will not collide strongly against the stock tray tray. In addition, the paper does not collide with the next paper that has been ejected, so the paper alignment does not deteriorate.

[0061] (Specific example)

Table 1 shows an example of the relationship between the printing drum speed and the discharge belt speed when the first to sixth printing speeds are set.

[0062] [Table 1] Output belt Printing drum

Printing Linear speed ratio Rotational speed Linear speed (X) Rotational speed Linear speed

Speed no. Nores X / Y u ra) (舰 / sec) (rpm) (mm / sec)

1st speed 2630 206.6 1533.7 45 459.375 3.339 2nd speed 2630 206.6 1533.7 80 816.67 1.878 3rd speed 2630 206.6 1533.7 100 1020.83 1.502 4th speed 2630 206.6 1533.7 120 1225 1.252 5th speed 2630 206.6 1533.7 130 1327.08 1.156 6th speed 3040 238.8 1772.8 150 1531.25 1.158

[0063] As shown in Table 1, the linear speed of the paper discharge belt is constant when the printing speed is between the first speed and the fifth speed (1533.3 mmZ seconds in this case), and is the sixth speed. In this case, it is set a little larger (here, 1772. 8mmZ seconds).

Industrial applicability

[0064] The sheet feeding device of the present invention has great industrial utility value because the sheet feeding table can be moved in a direction perpendicular to the sheet feeding direction without lowering the sheet feeding tray. .

Claims

The scope of the claims

[1] A paper feeding device that feeds stacked sheets one by one from the top to the next stage,

A paper tray that is loaded with paper and is movable in a direction perpendicular to the supply direction; and

Moving means for moving the sheet feed table in the orthogonal direction;

A paper feed tray on which a paper feed stand is placed and which can be raised and lowered;

Elevating means for elevating and lowering the paper feed tray;

A paper feed separating means that includes a paper feed roller, and separates and feeds the sheets stacked on the paper feed tray one by one from the top;

A movement instruction input means for inputting an instruction to move the paper feed tray by an arbitrary amount in the orthogonal direction;

In a paper feeding device comprising a movement control means for controlling the operation of the movement means based on an instruction input by the movement instruction input means.

A sheet feeding device comprising sheet feeding roller retracting means for retracting the sheet feeding roller so as to release contact with the uppermost sheet of the sheets stacked on the sheet feeding table.

2. The sheet feeding device according to claim 1, wherein the movement control means operates the moving means after the feeding roller is retracted by the feeding roller retracting means!

[3] The sheet feeding device according to claim 1, wherein the sheet feeding roller retracting means is configured to rotate the entire rotating shaft up and down around one end of the rotating shaft of the sheet feeding roller.

[4] The sheet feeding separating means includes a friction separating member biased so as to come into contact with the sheet feeding roller from below.

2. The paper feeding device according to claim 1, wherein the urging of the friction separating member is controlled so as to maintain a gap with the retracted paper feeding roller.

5. The sheet feeding device according to claim 1, wherein the movement instruction input means has a movement instruction key for simultaneously setting a movement direction and a movement amount.