JP3308006B2 - Paper feeder in printing machines, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device in a printing machine, a copying machine, a printer, and the like.

[0002]

2. Description of the Related Art FIG. 8 shows an example of a conventional stencil printing machine equipped with a paper feeder of this type. In this printer, reference numeral 1 denotes a printing device, reference numeral 40 denotes a paper feeder. The device 40 projects outside from the side of the printing device 1. The details of the paper feeding device 40 are as shown in FIGS.
The sheet feed bottom plate 51 has a front half 65 and a rear half 66, and the front half 65 is pivotally supported by the rear half 66 with a pivot 67 so as to be able to stand up as shown by a chain line in FIG. I have. A rack 52 is attached to the rear side edges of the rack 52, and a pinion 57 which is attached to a machine body side plate 55 on teeth 53 provided on a front edge of the rack 52 and is rotated by a lifting / lowering motor 54 via a worm gear set 56 meshes. And a pair of guide shafts projecting from both racks 52
68 is slidably fitted in a vertically long hole 69 provided in the body side plate 55.
A screw shaft 58 is provided rotatably on the back surface of the paper feed bottom plate 51,
The upper part of the knob 59 attached to its end is exposed to the outside through the slot provided in the paper feed bottom plate 51, while both racks
A pair of rack stays 61 are bridged between the brackets 52, and a bracket 62 extending in the front-rear direction along the back surface of the sheet feeding bottom plate 51 is attached to the rack stay 61.
A nut 62 screwed to the screw shaft 58 is attached to the tip of the nut.

When printing is performed by such a printing machine, the paper 30 is set on the paper feed bottom plate 51 at the position indicated by the solid line in FIG. 8, and when a start key on an operation panel (not shown) is pressed, the elevating motor 54 operates. Then, the pinion 57 is rotated, and the feed bottom plate 51 is raised through the meshing relationship between the pinion 57 and the rack 52, and the upper surface of the sheet 30 is brought into contact with the sheet feed roller 41 and a suitable pressure is applied. After stopping, the paper 30 is fed by the paper feed rollers 41, separated one by one by the separation unit 42, and is conveyed by the conveyance roller to the registration roller 45 through the path conveyance 44. Here, the paper 30 is paused, and after registration is performed, the paper 30 is conveyed to the drum 46, and is pressed against the outer peripheral surface of the drum 46 around which the pre-processed base paper is wound by the printing pressure roller 47, so that the paper 30 Is transferred onto the sheet 30, separated from the drum 46 by the suction unit 48, and perforated to improve sheet discharge alignment, and discharged onto the sheet discharge table 49. In such a printing press, since the base paper is wound around the drum 46 and cannot be moved, the image on the base paper cannot be moved.
Paper feeder to correct the position of
The paper 30 is moved at 40, but in this case, the feeding timing of the paper 30 is changed in the front-back direction, and the moving amount is visually observed with the knob 59 provided on the paper feeding bottom plate 51 in the left-right direction. The screw shaft 58 is rotated, and the sheet feeding bottom plate 51 is moved in the left-right direction by the screwing relationship between the nut 62 attached to the bracket 62 and the screw shaft 58 to perform positioning. When printing is completed in this way and the paper 30 is not set on the paper feed bottom plate 51, the front half 65 of the paper feed bottom plate 51 at the solid line position in FIG. 8 is raised to the position shown by the chain line in FIG. Let it stay out of the way.

[0004]

However, the paper feeding device 40 in such a printing press protrudes from the side of the printing device 1 to the outside, so that the entire device becomes large and requires a large installation space. In addition to the problem that the paper feed bottom plate 51 is moved left and right by manually operating the knob 59, it takes time, and the adjustment of the movement amount is all performed visually. Because of this, there is a problem that it is difficult to make fine adjustments because it is inaccurate, and furthermore, the horizontal movement of the paper feed tray is during the paper feeding operation, during the separation of the paper, or during the transport of the paper. However, there is a problem that the paper is forcibly bent by a paper feeding roller, a separating unit, a conveying roller, or the like, and causes problems such as skew, wrinkles, and tears.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional paper feeder, and
If the paper is misaligned in the horizontal direction with respect to the image on the base paper, the paper feed table is automatically moved to the right and left without the need for cumbersome manual operation when correcting and aligning the paper feed position. Movement and positioning without visual observation, accurate positioning can be performed in a short time, and a large installation space is not required. An object of the present invention is to provide a sheet feeding device that does not occur.

[0006]

In order to achieve the above object, the present invention provides a printing apparatus and a paper feeder, wherein the paper feeder is provided in a paper feed table. And a paper feed mechanism that feeds paper from the paper feed tray to the printing device. The paper feed tray can be raised and lowered on a paper feed tray provided inside the paper feed tray body In a printing machine or the like having a paper feeding bottom plate provided in the paper feeding device, the paper feeding device is disposed below the printing device, the paper feeding tray is housed in the paper feeding table so as to be able to be pulled out in the front-rear direction, and the paper feeding table is By actuating the drive member based on an instruction regarding the amount and direction of movement from a separately provided operation panel, the inside of the paper feed tray body can be moved left and right with respect to the paper transport direction, and the home position Member and home position sensor And a control means for correcting an error of the movement amount generated when the movement direction is switched according to a value input to the control unit in advance. It is. According to a second aspect of the present invention, in the first aspect of the present invention, when a left / right movement command is output from the operation panel during the paper feeding operation, the next paper feeding operation is interrupted, and after the paper in the paper feeding device is transported, The sheet feeding table is moved in the left-right direction, and after the operation is completed, the sheet feeding operation is restarted. According to a third aspect of the present invention, in the first aspect of the invention, when a left / right movement command is output from the operation panel during the paper feeding operation, the next paper feeding operation is interrupted, and after the paper in the paper feeding device is transported, After lowering the paper feed bottom plate until the paper is separated from the paper feed roller, move the paper feed table to the left and right, and after the operation is completed, raise the paper until it touches the paper feed roller, and then restart the paper feed operation Things. According to a fourth aspect of the present invention, in the first aspect of the present invention, when a left-right movement command is output from the operation panel during the paper feeding operation, the paper feeding table is avoided during the paper feeding operation while avoiding the operation of the paper feeding roller. In the left-right direction.
According to a fifth aspect of the present invention, in the first aspect of the present invention, when a left / right movement command is output from the operation panel during a sheet feeding operation, a message, display, or the like is performed on the operation panel so that the left / right movement command is not input. It was made.

[0007]

According to the first aspect of the present invention, when a sheet is displaced in the left-right direction with respect to an image on a base sheet during printing, the sheet supply table is moved left and right in the sheet supply tray. That is, such a lateral movement of the sheet supply table is performed by operating a driving member based on an instruction regarding a movement amount and a movement direction from an operation panel. Then, when the power is turned on, the paper feed tray is once moved to a position in one direction in which the home position sensor does not detect the home position member, and then moved in the other direction by a command of the control unit, and then the home position sensor is moved to the home position. When the position member is detected, the origin stops at this point, and the movement in the other direction is stored in the control unit, and then the movement direction and the movement amount of the paper feed tray are input by the operation panel, and the control unit inputs from the operation panel. The moving direction information obtained is compared with the other moving direction of the sheet feeding table stored in the control unit. In this case, since the moving direction is different, the input information of the moving amount from the operation panel by a predetermined amount is used. Will be different from
The control unit issues a command to the driving member as a corrected value by adding a predetermined amount to the input movement amount, and changes the movement direction stored in the control unit to the one direction. In the invention according to claim 2, when a left / right movement command is output from the operation panel during the paper feeding operation, the next paper feeding operation is interrupted, and after the paper in the paper feeding device is conveyed, the paper feeding table is moved in the left / right direction. It moves, and resumes the paper feeding operation after the operation is completed. According to the third aspect of the present invention, when a left / right movement command is output from the operation panel during the paper feeding operation, the next paper feeding operation is interrupted, and after the paper is conveyed in the paper feeding device, the paper is separated from the paper feeding roller. After lowering the sheet feeding bottom plate, the sheet feeding table is moved in the left-right direction, and after the operation is completed, the sheet feeding table is raised until the sheet comes into contact with the sheet feeding roller, and then the sheet feeding operation is restarted. According to the fourth aspect of the present invention, when a left / right movement command is output from the operation panel during the sheet feeding operation, the sheet feeding table is moved in the left / right direction during the sheet feeding operation while avoiding the operation of the sheet feeding roller. In the invention according to the fifth aspect, when a left / right movement command is output from the operation panel during the paper feeding operation, a message, display, or the like is performed on the operation panel so that the left / right movement command is not input.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention shown in the drawings, the same parts as those of the prior art are denoted by the same reference numerals, and the description thereof will be omitted. In this printing press, a paper feeding device 2 is arranged below a printing device 1, and the paper feeding device 2 can be pulled out in a front-rear direction into a paper feeding table 3 and is arranged in a plurality of stages vertically as shown in FIG. It has a paper feed tray 4 as shown, and a paper feed mechanism (not shown) for feeding paper from the paper feed tray 4 to the printing apparatus 1. A paper feed table 7 is provided on the paper feed tray 4. The details of the paper feed table 7 are shown in FIGS. 3 and 4. A guide bar 9 laid between the side plates of the paper feed tray main body 5 slides into a through hole formed in the side plate 22 so that the guide bar 9 slides. The paper feed table 7 is mounted on the bar 9 so as to be movable in the left-right direction, and a pair of vertically long holes 23 are provided in the side plate 22, and both ends of the support bar 26 are slidably fitted in these long holes 23.
The paper feed bottom plate 8 is placed on these support rods 26, and a wire 27 is connected to one end of the support rod 26, and the wire 27 is stretched between rollers 28, 29, 32 pivotally supported by the side plate 22. The shaft 33 of the roller 28 is rotated by a motor 31 provided on the side plate 22 via an interlocking mechanism 34, and the roller 32 is a tension roller. Then, on the bottom plate 35 of the sheet feeding table 7, the sheet feeding table 7
Is provided with a ball screw 13 and a disk with a slit 14 via a joint 12 on a shaft of the motor 10.
As shown in FIG. 6, a number of slits 21 are provided radially at equal intervals, and a bracket 15 is screwed onto the ball screw 13. The bracket 15 is erected on the bottom plate of the paper feed tray body 5. ing. The paper feed table 7 faces the disk 14 with the slit.
A slit sensor 17 is provided on the surface of the bottom plate of the sheet feeder, and a home position plate 18 is provided on the back surface of the bottom plate of the paper feed table 7, and a home position sensor 19 for detecting the home position plate 18 is provided.
Is provided on the bottom plate of the paper feed tray body 5. In such a case, when the paper feed tray 4 is set in the paper feed table 3, the paper feed tray 3 and the paper feed tray 4 are engaged with each other, and power is supplied to the motors 10 and 31 from a power supply (not shown). When the tray 4 is pulled out from the paper feed table 3, a connector (not shown) that is disengaged is provided.

In the apparatus described above, the paper feed tray 4 of the paper feed device 2 is pulled out from the paper feed table 3 and the paper 30 is set on the paper feed bottom plate 8, and the operation panel 24 shown in FIG. When the start key is pressed, the motor 31 is operated to move the wire 27 in the direction of the arrow in FIG. 4, and the support rod 56 is moved up along the slot 23 of the sheet feeding table 7 while holding the sheet feeding bottom plate 8. Then, the upper surface of the paper 30 comes into contact with the paper feed rollers 41 and becomes an appropriate pressure. When the pressure rises until the upper surface detection feeler (not shown) detects the pressure, the paper feed bottom plate 8 stops, and the paper 30 is moved by the paper feed rollers 41. The paper is fed and separated by the separation unit 42 one by one.
The sheet is conveyed to a registration roller 45 through a path conveyance 44 by 43. Here, the paper 30 is temporarily stopped, and after registration is performed, the paper 30 is again conveyed to the drum 46, and is pressed against the outer peripheral surface of the drum 46 around which the perforated base paper is wound by the printing pressure roller 47, so that the base paper The upper image is transferred to the sheet 30, separated from the drum 46 by the suction unit 48, and perforated to improve sheet discharge alignment, and discharged to the sheet discharge table 49.

If the paper 30 is misaligned with respect to the image on the base paper in the left-right direction during printing as described above, the paper tray must be moved to correct it. The paper feed table 7 is moved left and right with respect to the rotation of the ball screw 13 by operating the motor 10 according to an instruction issued based on a program pre-installed in the operation panel 24. This causes the paper feed table 7 on which the bracket 15 on which the screw 15 is screwed to be mounted to move left and right. At this time, the disk with slit 14 also rotates in synchronization with the rotation of the motor 10, and The number of slits 21 is counted by the slit sensor 17 to detect the amount of movement. In this case, the problem is that a play of the amount c occurs between the paper feed table 7 and the bracket 15 due to backlash of the screw portion of the ball screw 13 or backlash, as shown in FIG.
Due to this, when the movement direction is switched from one direction a to the other direction b and from the other direction b to the one direction a, the movement amount detected by the slit sensor 17 of the sheet feeding table 7 and the actual movement amount are different. An error corresponding to the amount c 'occurs in the slit 21 of the disk with slits 14 therebetween.

Therefore, such an error amount c 'is obtained in advance by an experiment or the like and set as a correction value, and only when the moving direction is switched, the moving amount is corrected by the correction value c'. FIG. 7 shows an outline of a control means for reducing the error of the movement amount due to the switching of. When the power is turned on, the paper feed tray 7 is controlled by the home position sensor 19 in FIG.
Is once moved in the direction a on one side to a position where the home position plate 18 is not detected, and then moved in the direction b on the other side, and the home position is stopped when the home position sensor 19 detects the home position plate 18. Here, the movement in the other direction b is stored in the RAM 38 of the control unit 36. Next, for example, when the moving direction of the paper feed tray 7 is input as one direction a and the moving amount is x as input by the operation panel 24, first, the CPU 37 of the control unit 36 transmits the one-way input information a from the operation panel 24,
The other direction memory information b stored in the RAM 38 of the control unit 36 is compared with the other direction memory information b. In this case, since the moving direction is different, the backlash of the ball screw 13 or backlash causes The amount c becomes negative with respect to the input information x of the movement amount from the operation panel 24. Therefore, a command is issued from the CPU 37 to the motor 10 as the corrected value of the quantity x + c, and the moving direction of the RAM 38 is changed to one direction a. Here, in the disk with slits 14, the number x '+ c' of the slits 21 corresponding to the movement amount x is the value after correction. In this case, if the one-way input information a from the operation panel 24 is the memory information b in the other direction stored in the RAM 38, no correction is performed, and the information on the moving direction of the RAM 38 remains unchanged at b. In this way, it is possible to reduce the error of the moving amount due to the switching of the moving direction without adding any extra mechanism, and since the memory is in a backup system, the previous operation can be performed when the power is turned off. Information on the left and right input directions from the panel 24 can be stored,
In this case, there is no need to adjust the left and right movement amounts each time the power is turned on and off, which is convenient.

When a left / right movement key (not shown) on the operation panel 24 is turned on and a left / right movement command is output during the paper feeding operation, the movement command is input to the control unit 36 and the paper feeding rollers 41 are fed. Temporarily suspends the paper feeding operation of the next paper 30 by the
When there is no more, the paper feed table 7 is moved in the left-right direction, and after the operation is completed, the paper feed operation by the paper feed rollers 41 is restarted. Further, when the paper 30 is exhausted in the transport path 44 at the time of the above, after lowering the paper supply bottom plate 8 until the paper 30 is separated from the paper supply roller 41,
The paper feed table 7 is moved to the left and right, and after the operation is completed,
Is raised until it comes into contact with the paper feed roller 41, and then the paper feed operation is restarted. Also, when a left / right movement command is output from the operation panel 24 during the paper feeding operation, the movement command is input to the control unit 36 so that the paper feeding roller 41 is not operated and the paper feeding is performed between the paper feeding operations. The table 7 is moved left and right. Further, when a left / right movement command is output from the operation panel 24 during the sheet feeding operation, the movement command is input to the control unit 36, a message or display is performed on the operation panel 24, and the left / right movement command is not input. To do. As described above, skew, wrinkles, tears, and the like are prevented from occurring in the paper during paper feeding.

[0013]

The present invention is as described above, and the invention of claim 1 comprises a printing device and a paper feeding device, wherein the paper feeding device is provided with a paper feeding tray housed in a paper feeding table. A sheet feeding mechanism for feeding sheets from the sheet feeding tray to the printing apparatus, wherein the sheet feeding tray is provided on a sheet feeding table provided inside the sheet feeding tray body so as to be able to move up and down. In a printing press having a paper feed device, the paper feed device is disposed below the print device, a paper feed tray is housed in a paper feed table so as to be able to be pulled out in the front-rear direction, and a paper feed table is provided from an operation panel provided separately. By actuating the drive member based on the instruction regarding the movement amount and the movement direction, the drive member can be moved in the paper feed tray body in the left-right direction with respect to the paper conveyance direction, and has a home position member and a home position sensor. Paper tray movement amount detection means Control means for correcting the error of the movement amount generated when the movement direction is switched according to the value input to the control unit in advance. In the event of misalignment, the paper feed table will automatically move to the left and right without any troublesome manual operation, and will be positioned without any visual inspection when correcting and aligning the paper feed position. So
Accurate positioning can be performed in a short time, and the entire apparatus does not become large, and a large installation space is not required. Further, there is an effect that the error of the moving amount due to the switching of the moving direction can be reduced without adding an extra mechanism. The invention of claim 2 is
In the invention according to claim 1, when a left / right movement command is output from the operation panel during the paper feeding operation, the next paper feeding operation is interrupted, and after the paper in the paper feeding device is transported, the paper feeding table is moved in the left / right direction. The sheet feeding operation is resumed after the operation is completed. According to a third aspect of the present invention, when a left / right movement command is output from the operation panel during the sheet feeding operation, the following operation is performed. After the paper feed operation is interrupted and the paper in the paper feeder is conveyed, the paper feed bottom plate is lowered until the paper is removed from the paper feed roller, and then the paper feed base is moved in the left and right direction. The paper feed roller is raised until it comes into contact with the paper feed roller, and then the paper feed operation is restarted. According to the invention of claim 1, the left / right movement command is output from the operation panel during the paper feed operation. In this case, avoid the paper feed roller during operation, and Is intended to move in the right direction,
According to a fifth aspect of the present invention, in the first aspect of the present invention, when a left / right movement command is output from the operation panel during the paper feeding operation, a message, display, or the like is displayed on the operation panel so that the left / right movement command is not input. Therefore, these inventions have the same effects as those of the first aspect of the invention, and also have the skew and wrinkle of the paper when a command to move the paper feed tray left and right is output during paper feeding. This has the effect of preventing the occurrence of defects such as breakage.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an embodiment of the present invention.

FIG. 2 is a side view of the paper feed tray.

FIG. 3 is a perspective view of the sheet feeding table according to the first embodiment.

FIG. 4 is a diagram of a mechanism for elevating and lowering the sheet feeding bottom plate of the above.

FIG. 5 is an enlarged front explanatory view of a part of FIG. 2;

FIG. 6 is a front view of the disk with slits according to the first embodiment;

FIG. 7 is a schematic diagram of a control unit of the above.

FIG. 8 is a schematic front view similar to FIG. 1 of a printing press of the same type as the present invention.

FIG. 9 is a perspective view of the sheet feeding unit according to the third embodiment.

FIG. 10 is a perspective view of the same as the above except that the machine body side plate and the paper feed bottom plate are removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printer 2 Paper feeder 3 Paper feed table 4 Paper feed tray 5 Paper feed tray body 7 Paper feed stand 8 Paper feed bottom plate 9 Guide bar 11 Paper 13 Ball screw 14 Disk with slit 17 Sensor 18 Home position plate 19 Home position Sensor 21 Slit 24 Operation panel 36 Suppression unit 37 CPU 38 RAM

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 1/04 320 B65H 1/26 312

Claims (5)

(57) [Claims] 1. A printing apparatus, comprising: a printing device; and a paper feeding device, wherein the paper feeding device includes a paper feeding tray housed in a paper feeding table, and a paper feeding mechanism for feeding paper from the paper feeding tray to the printing device. In a printing machine or the like having a paper feed bottom plate provided so that the paper feed tray can be raised and lowered on a paper feed table provided inside a paper feed tray main body, the paper feed device is disposed below the printing device. The paper feed tray is accommodated in the paper feed table so as to be able to be pulled out in the front-rear direction, and the paper feed tray is fed by an operation of a driving member based on a movement amount and a movement direction from a separately provided operation panel. A movement amount detecting means for a sheet feeding table having a home position member and a home position sensor, which can move in the tray body in the left-right direction with respect to the sheet conveyance direction, and movement generated when the movement direction is switched. The amount of error A paper feeder for a printing machine or the like, comprising: a control unit that corrects according to a value input to a control unit in advance. 2. When a left / right movement command is output from an operation panel during a paper feeding operation, the next paper feeding operation is interrupted, and after the paper in the paper feeding device is transported, the paper feeding table is moved in the left / right direction. 2. The sheet feeding device in a printing machine or the like according to claim 1, wherein the sheet feeding operation is restarted after the operation is completed. 3. If a left / right movement command is output from the operation panel during the paper feeding operation, the next paper feeding operation is interrupted, and after the paper in the paper feeding device is conveyed, the paper is fed until the paper is separated from the paper feeding roller. 2. The paper feeder according to claim 1, wherein after the paper bottom plate is lowered, the paper feed table is moved in the left-right direction, and after the operation is completed, the paper feed tray is raised until the paper comes into contact with the paper feed rollers, and then the paper feed operation is resumed. Paper equipment. 4. When a left / right movement command is output from an operation panel during a sheet feeding operation, the sheet feeding table is moved in the left / right direction during the sheet feeding operation while avoiding the operation of the sheet feeding roller. Paper feeder in printing machines and the like. 5. The printing press according to claim 1, wherein when a left / right movement command is output from the operation panel during the paper feeding operation, a message, a display, etc. is displayed on the operation panel, and the left / right movement command is not input. Paper feeder.