JPH0640137A - Stencil printing machine - Google Patents

Abstract

PURPOSE:To enable high speed operation of a printing device and improve the printing efficiency, by a method wherein a device storing a plurality of paper feed speeds and the other established data is provided and the paper feed speeds are established by corresponding to the plurality of the printing speed of a printing device main body. CONSTITUTION:A tip stopper 47 of a form is lowered by turning ON a solenoid, data selected through a driving starting command of a paper feed motor 61 and a printing condition is applied to a paper feed motor driving part in accordance with a condition read in by selecting a conveying speed and timing in paper feed starting. Simultaneously with starting of conveyance of the form 30 from a paper feed device 2, the form 30 which have been on places of feed rollers 12a, 12b are sent between a printing drum 3 and press roller 5 at a fixed timing synchronized with the rotation of the printing drum. When the form 30 reaches a space between the printing drum 3 and press roller 5, the press roller 5 which has been lowered so far is raised, the form 30 is printed and delivered to a paper delivery rest 9 and a printing process of the first form 30 is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine.

[0002]

2. Description of the Related Art An example of a conventional stencil printing machine of this type is shown in FIG.
Porous printing drum 3 having ink supply means 4 inside
And a press roller 5 that presses the paper against the printing drum 3.
And a paper feeding device 84 for feeding paper between the printing drum 3 and the press roller 5 of the printing device 1.
It is equipped with The printer 1 has an original reading unit 7 on one side of the upper part
However, a plate making and plate feeding section 8 is provided on the other side, the document 10 is read by the document reading section 7, the image is plate-made on the base paper 11 in the plate making and plate feeding section 8, and is printed by the section 8. The printing drum 3 is fed to the drum 3, mounted on the outer periphery thereof, fed from the paper feeding device 80, and fed by the feed rollers 12a and 12b.
The paper 30 supplied between the press roller 5 and the press roller 5 is pressed against the base paper 11 by the press roller 5, is supplied by the ink supply means 4, and is printed on the paper 30 by the ink bleeding from the base paper 11. The sheet 30 is discharged to the sheet discharge tray 9, and the used base paper 11 is stored in the plate discharge section 6. However, since the sheet feeding device 80 in such a printing machine projects to the outside from the side surface of the printing device 1, there is a problem in that the entire device becomes large and a large installation space is required.

Therefore, in order to solve such a problem, the applicant of the present invention uses the paper feeding device 2 having a front loading structure, which is used in a copying machine, as a printing device 1.
I devised a printing machine combined with the above and applied for it as Japanese Patent Application No. 4-2529. Such a sheet feeding device 2 is also used in the embodiment of the present invention shown in FIG. 1, and the main part thereof is as shown in FIGS. 2 to 4, which will be described with reference to these.

In this printing press, the same parts as those of the conventional printing press are designated by the same reference numerals, and the description thereof will be omitted. The different parts will be mainly described. A paper feeding device 2 is arranged below the printing device 1, and the paper feeding device 2 is a paper feeding table.
Paper feed trays 14a and 14b as shown in FIG. 13, which are arranged in a plurality of upper and lower stages (two stages in this example) so that they can be pulled out in the front-rear direction, and a printing device from these paper feed trays 14a and 14b. 1
And a paper feed mechanism for feeding paper to the paper feed tray 14a,
A paper feed table 17 is provided in each of b. This paper tray
The guide bar 19 slidably fitted between the side plates of the paper feed tray main body 15 is slidably fitted into the through hole provided in the side plate 32, and the paper feed tray 17 is mounted on the guide bar 19 so as to be movable in the left-right direction. And side plates
32 is provided with a pair of vertically oriented long holes 33.
Both ends of the support rod 36 are slidably fitted in the 33, the paper feed bottom plates 18a and 18b are placed on these support rods 36, and the wires 37 are attached to the ends of the support rod 36.
, And the wire 37 is a roller pivotally supported on the side plate 32.
The shaft 43 of the roller 38 is stretched between 38, 39, and 42, and the interlocking mechanism 44
It is adapted to be rotated by a vertical motor 41 provided on the side plate 32 via the roller 42, and the roller 42 is a tension roller. A motor 20 for moving the paper feed table 17 in the left-right direction is provided on the bottom plate 45 of the paper feed table 17, and a ball screw 23 and a disc 24 with a slit are attached to the shaft of the motor 20 via a joint 22. A large number of slits are radially provided at equal intervals on the slitted disc 24, and a bracket 25 is screwed onto the ball screw 23.
Is erected on the bottom plate of the paper feed tray body 15. A slit sensor 27 is provided on the surface of the bottom plate of the paper feed table 17 facing the circular plate with slits 24, and a home position plate 28 is provided on the back surface of the bottom plate of the paper feed table 17, and the home position plate 28 is detected. A home position sensor 29 is provided on the bottom plate of the paper feed tray body 15. In such a case, the sheet feed table 13 and the sheet feed tray 14 are engaged when the sheet feed tray 14 is set in the sheet feed table 13, and power is supplied to the motors 20 and 41 from a power source (not shown). Tray 14 Feeding Table 13
A connector (not shown) that disengages when pulled out from is provided.

In the printing machine as described above, the paper feeding device 2
When the paper feed trays 14a and 14b of the paper are pulled out forward from the paper feed table 13, the paper 30 is set on the paper feed bottom plates 18a and 18b, and the start key of the operation panel (not shown) is pressed, the motor 41
Activates to move the wire 37 in the direction of the arrow in Fig. 15, and
The long hole 33 of the paper feeding stand 17 while carrying the paper feeding bottom plates 18a and 18b.
Paper feed bottom plate 18a, when the upper surface of the paper 30 abuts the separation rollers 51a, 51b and rises to an appropriate pressure.
b is stopped, and the sheet 30 is fed by the separating rollers 51a, b, separated one by one by the separating pads 52a, b, and conveyed by the conveying roller 55 through the conveying path 56 to the feed rollers 12a, 12b. Here, the sheet of paper 30 is temporarily stopped, and after registration is performed, it is conveyed to the printing drum 3 again, and is pressed by the press roller 5 against the outer peripheral surface of the printing drum 3 having the plate-making base paper 11 wound on its outer periphery. The image on the base paper 11 is transferred onto the paper 30 and discharged onto the paper discharge tray 9.

[0006]

In the printing machine as described above, since the paper feeding device 2 is installed below the printing device 1 and does not project to the outside from the side surface, the plane area occupied by the entire device becomes small. Although it was possible to solve the problems of the conventional printing press without requiring a large installation space, the paper feeding speed of the paper feeding device 2 is constant and set to a low speed. Therefore, there is a problem that even if the printer 1 is attempted to operate at high speed, it is impossible to improve the printing efficiency. The paper feeding speed in the paper device 2 is gradually changed, and it is difficult to cover all the speeds with the paper feeding speed obtained in advance in the experiment. Also there is a problem that it is not possible to prevent the occurrence of and wrinkles.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional sheet feeding device, reduce the plane area occupied by the entire device, and eliminate the need for a large installation space. In addition, the paper feeding speed of the paper feeding device can be changed to enable high-speed operation of the printing device, improve the printing efficiency, and prevent the occurrence of variations in the printing speed. (EN) It is possible to provide a stencil printing machine capable of preventing a timing shift and a wrinkle caused by a stepwise change.

[0008]

In order to achieve the above-mentioned object, the present invention provides a porous printing drum having a stencil sheet mounted on the outer periphery and ink supply means inside. A printing device having a press roller for pressing the paper against the printing drum, and a paper feeding device for feeding the paper between the printing drum and the press roller of the printing device. Stencil printing having a pull-out type paper feed tray housed in a table, a separating means for separating the paper stacked on the paper feed tray, and a feeding means for feeding the separated paper to the printing apparatus main body. A detection device for detecting the state of the printing apparatus main body of the printing apparatus,
Judgment means for judging the condition to be set according to the detected state, output means for providing various information to the printing apparatus main body, a plurality of paper feed speeds and other setting data previously obtained by experiments are stored. And a plurality of sheet feeding speeds corresponding to a plurality of printing speeds of the printing apparatus main body. According to a second aspect of the invention, in the first aspect of the invention, the sheet feeding speed of the sheet feeding device is set higher than the printing speed of the printing device. According to a third aspect of the invention, in the first aspect of the invention, a stopper for aligning the leading ends of the sheets is provided at the feed roller that supplies the sheets to the printing drum. According to a fourth aspect of the invention, in the first aspect of the invention, the sheet feeding is started after a predetermined time delay from the time when the predetermined position of the printing drum is detected. According to a fifth aspect of the invention, in the first aspect of the invention, the paper feed is started before the printing process is started by the print start key. According to the invention of claim 6, in the invention of claim 1, the first first sheet to be fed is fed at the maximum speed of the sheet feeding device regardless of the setting conditions of the printing machine. Has become. According to a seventh aspect of the present invention, a stencil sheet is mounted on the outer periphery of the stencil sheet, a porous printing drum having an ink supply means inside, a printing roller having a press roller for pressing the printing sheet against the printing drum, and printing by the printing apparatus. A paper feeding device that feeds paper between the drum and the press roller is provided, and the paper feeding device stores a drawer type paper feeding tray housed in a paper feeding table and the paper loaded on the paper feeding tray. Separating means for separating,
In a stencil printing machine having a feeding means for feeding the separated sheets to the main body of the printing apparatus, a speed detecting means for detecting an actual rotation speed of the printing drum is provided, and a stepping motor is used as a paper feeding motor of the paper feeding apparatus. And a driver circuit for driving the stepping motor by directly using the speed information from the speed detecting means, continuously changing the speed of the paper feeding device, and synchronizing the paper feeding speed with the printing speed. It is characterized by. According to the invention of claim 8, in the invention of claim 7, the output of the speed detecting means of the printing drum is counted to detect a predetermined position of the printing drum, and the paper separating means of the paper feeding device is operated to supply the paper. It measures the paper timing.

[0009]

According to the present invention as described above, the number of sheets to be printed is set on the operation panel of the printing machine, the print start switch is turned on, and at the same time, the presence / absence of paper in the transport path is determined. Under the conditions, the first sheet of paper is fed at a specific conveyance speed and a feeding start timing to be in a print preparation state. After that, the print drum starts to rotate and the print drum is set to a predetermined position as in the case of having the paper. When it is detected, the paper feed management means reads the printing conditions such as the printing speed and the number of printed sheets, and the stopper driving unit lowers the leading edge stopper of the paper according to the printing conditions to convey the feeding speed and the feeding start timing. To output the data selected by the feed motor drive start command and the print condition to the feed motor drive unit according to the read conditions. At the same time that the paper is started to be conveyed from the paper feeding device, the paper at the feed roller is sent between the print drum and the press roller at a predetermined timing in synchronization with the rotation of the print drum, and the paper is transferred to the print drum. Between the press roller and the press roller, the press roller, which has been lowered so far, rises, is printed on the paper, and is ejected to the paper ejection tray. In this way, the printing process of the first paper is completed. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first and second embodiments of the present invention shown in the drawings, parts similar to those of the above-mentioned conventional and prior applications are:
The same reference numerals are given and the description thereof is omitted, and mainly different parts will be described. Most of the printing device 1 and the paper feeding device 2 are similar to those of the previous application. A sheet leading end stopper 47 is provided on the conveying path 56 in front of the feed rollers 12a and 12b, and this stopper 47 is as shown in FIGS. 48 is pivotally supported by the machine frame of the printing apparatus 1, a lever 49 is mounted on the opposite side of the support shaft 48 from the stopper 47 in parallel with the stopper 47, and the operating rod of the solenoid 50 is attached to the tip of the lever 49 on the stopper 47 side. The upper end of the spring 46 is connected to the opposite end thereof, and the lower end of the spring 46 and the solenoid 50 are attached to the machine frame of the printing apparatus 1, respectively. As shown in FIG. 7, a detection body 53 is provided on one side plate of the printing drum 3 so as to project,
A drum sensor 54 is provided to detect when the sheet 30 located at the feed rollers 12a and 12b is started to be fed to the machine frame of the printing apparatus 1. The separating rollers 51a, b and the separating pads 52a, b are as shown in FIGS. 8 to 10, and the shaft 57 of the separating rollers 51a, b is pivotally supported by the side plate of the sheet feeding table 13, and a gear is attached to the tip of the shaft 57. 58 is attached and this gear 58
Mesh with a gear provided on the electromagnetic clutch 59. On the other hand, a paper feed motor 61 for driving the separating rollers 51a and 51b is provided at the lower part of one side of the paper feed table 13, and there is no end between the paper feed motor 61 and a roller 62 pivotally supported by the side plate of the paper feed table 13. The belt 63 is suspended, and a gear 64 rotated by the endless belt 63 meshes with the gear provided on the electromagnetic clutch 59 and the drive roller 55 driving gear via an intermediate gear 65. If the installation space is large, the sheet feeding device 84 may be left attached.

Further, the paper feed table 13 is provided with a paper feed management means 70 for the paper feed device 2. The paper feed management means 70 is as shown in FIG. 11, and is a normal microcomputer 77 having a CPU 72, a RAM 73, a ROM 74, and two input / output ports 75 and 76 which are connected to each other by a signal bus 71.
It is equipped with Then, to the input / output port 75 of the microcomputer 77, (1) information signals regarding presence / absence of paper from paper sensors 66, 67, 68 provided in the transport path 56, (2)
An information signal regarding the rotational position of the print drum 3 is input from a drum sensor 54 provided on the drive path of the print drum 3. Further, the input / output port 76 is provided with an information signal relating to the print speed via a control board 78 from (1) print speed setting switch of an operation panel (not shown) provided in the printer 1.
(2) An information signal regarding the number of prints is input from the keyboard for setting the number of prints via the control board 78, and (3) An information signal regarding the start of printing is input via the control board 78 from the print start switch.

The operation management means 70 selectively executes a paper feed state management routine, a paper feed conveyance routine, and a paper feed device abnormality output routine, as will be described later according to the flow charts shown in FIGS. Input / output port
A paper feed motor drive 80, a paper feed bottom plate drive 81, which moves the paper feed bottom plates 18a, 18b up or down to the separation rollers 51a, b, and moves downward from there, a paper leading edge stopper drive 82, a paper separation drive.
A control signal is output to 83, and a control signal is output from the input / output port 76 to the error display device of the printing device. The paper feed motor drive unit 80 is composed of a driver circuit for the paper feed motor 61, drives the paper feed motor 61 while controlling the rotation speed based on the speed information from the paper feed management unit 70, and the paper feed bottom plate drive unit 81 feeds paper. Vertical movement motor that moves the bottom plate 18 up and down
It is composed of a driver circuit for driving 41
The vertical movement motor 41 is rotated normally or reversely according to the command information from the sheet leading edge stopper driving unit 82,
It is composed of a driver circuit for turning on / off the solenoid 50 of the 47, and when the solenoid 50 is turned off, the stopper 47 is pulled by the spring 46 so as to take the stop position. It is composed of a driver circuit for engaging and disengaging the electromagnetic clutch 59 that interlocks with or releases the motor 61.

The RAM 73 stores a memory area for storing the set number of prints of the printer 1, a memory area for storing the number of sheets separated by the sheet separation drive unit 83, and various program processing times and calculation values. The CPU 72 has a memory area and has a function of detecting a predetermined position of the print drum 3, that is, a function of supplying the paper 30 in synchronization with the printing apparatus 1 by executing a paper feed / conveyance routine based on a detection signal of the drum sensor 54. By executing the paper feed management routine, the function of driving the paper feed bottom plate drive unit 81, the paper leading edge stopper drive unit 82, and the paper separation drive unit 83, and by executing the paper feed device abnormal output routine, the printing device 1 and the operator are abnormal. It has the function of informing.

In the above-mentioned apparatus, the number of sheets to be printed is set on the operation panel of the printing machine, the print start switch is turned on, and at the same time, the presence or absence of the sheet 30 at the sheet sensor 68 is determined. Then, the first sheet 30 is fed at a specific transport speed and a feeding start timing to be in a print preparation state. After that, the printing drum 3 starts to rotate, and the drum sensor 54 detects the detection body 53, as in the case where there is paper.
When the paper feed management means 70 detects the printing speed, the printing conditions such as the printing speed and the number of printed sheets are read, and the stopper driving unit 82 turns on the solenoid 50 to move down the paper front end stopper 47 according to the printing conditions, and the feeding speed and The paper feed start timing and the like are selected, and the drive start command of the paper feed motor 61 and the data selected according to the printing conditions are output to the paper feed motor drive unit 80 in accordance with the read conditions. In this way, the conveyance of the sheet 30 from the sheet feeding device 2 is started, and at the same time,
The sheet 30 located at the feed rollers 12a and 12b is sent between the print drum 3 and the press roller 5 at a predetermined timing synchronized with the rotation of the print drum 3. When the paper 30 comes between the printing drum 3 and the press roller 5, the press roller 5 which has been lowered so far is lifted, and as described above,
It is printed on 30 and ejected to the paper output tray 9, thus 1
The printing process of the third sheet 30 is completed.

At this time, the second sheet 30 is the first sheet.
When the sheet 30 is conveyed by the feed rollers 12a and 12b and the sheet 30 is not present at the sheet sensors 66 and 67 provided in the vertical conveying section of the conveying path 56, the separating rollers 51a and 51b are separated from each other. The pad 52a or 52b starts to separate the uppermost sheet 30 and sends it to the vertical conveyance section of the conveyance path 56, and then conveys it toward the sheet leading end stopper 47 by the conveyance roller 55. By repeating this,
The paper feeding device 2 continues to feed the paper 30 to the printing device 1, and the separating work by the separating roller 51a or 51b and the separating pad 52a or 52b is repeated by the number of prints set on the operation panel. Becomes

In the above-mentioned prior application, since the transport distance of the transport path 56 is long, after the printing apparatus 1 starts the printing process,
Since it is difficult to synchronize the printing process and the paper feeding process when the paper feeding process by the paper feeding device 2 is started, in the present invention, as described above, the paper sensor 66, 67, 68 detects the paper 30. Upon detection, the paper feed management means 70 selects the highest conveyance speed, the shortest paper feed start timing, etc., and the paper feed start command and data of the paper feed motor 61 are output, and the first paper 30 is output. By conveying toward the feed rollers 12a and 12b,
The printing process and the paper feeding process can be synchronized by turning on the printing start switch.

In order to synchronize both processes in this way, if the conveying speed by the paper feeding device 2 is equal to the printing speed by the printing device 1, that is, if the printing device 1 is a 5-speed shift, It is preferable that the sheet feeding device 2 also has the same five kinds of speeds, but the sheet feeding tray 14a,
Slip that occurs when the sheets 30 stacked on the sheet b are separated sheet by sheet by the separation rollers 51a or 51b and the separation pads 52a or 52b, and when the sheets 30 are conveyed toward the feed rollers 12a, b. Due to such a loss, there arises a problem that the timing at which the feed rollers 12a and 12b send the sheet 30 between the printing drum 3 and the press roller 5 is delayed from the printing timing and is not in time. In order to solve such a problem, it is necessary to feed the paper feeding device 2 at a feeding speed higher than the feeding speed during the printing process to eliminate the loss.
Increase from m / sec by 200mm / sec in 5 steps to 1500mm / sec. If the circumference of the print drum 3 is 600 mm, the movement distance of the paper 30 in one cycle of the printing process is
Since it is 600 mm / cycle, if the length of the paper 30 is set to the maximum length of 432 mm at this time, only 600 mm can be conveyed in one sheet feeding process, so the maximum conveyance interval is 168 mm. However, if the conveyance speed of the sheet feeding device 2 is extremely high,
There is a case where the space between the sheets 30 that is allowed up to 168 mm is lost in the middle of conveyance and the sheets 30 collide with each other. Therefore, even if the speed is set so as not to cause such a collision, it must be set so as not to cause the loss.

In consideration of the above, the feeding speed of the paper feeding device 2 is increased by 0 to 25% with respect to the printing speed of the printing device 1. In this embodiment, as shown in FIG. Increase the transport speed of the paper feeder 2 by 25% to increase from 500mm / sec to 1500mm / sec.
Let sec. However, by increasing the conveying speed of the paper feeding device 2 relative to the printing speed of the printing device 1, the paper 30 reaches here before the feed rollers 12a and 12b are closed, and the paper is rotated when the printing drum 3 rotates. There is a problem that the feeding of the sheet 30 is not synchronized and the leading edge of the sheet 30 is conveyed between the printing drum 3 and the press roller 5 at different timings. In order to avoid such a problem, a stopper 47 for aligning the leading end of the sheet 30 in such a position that the feed rollers 12a, b are not excessively moved at this time is located at a position where the leading end blocks the tangent line of the feed rollers 12a, b. To arrange. The stopper 47 is activated when the drum sensor 54 detects the detector 53 of the print drum 3.

The above-mentioned start timing means that when the paper 30 located at the feed rollers 12a and 12b is started to be fed, the detection body 53 detected by the drum sensor 54 provided in the machine frame of the printing apparatus 1 is set to the printing drum. It is a time to issue a paper feed start command when the drum sensor 54 detects the detection body 53 at a predetermined position of No. 3. Since this drum sensor 54 is also used for the lowering timing of the stopper 47, it must be provided so as to detect the predetermined position of the printing drum 3 when the feed rollers 12a, 12b are closed. Here, after the feed rollers 12a and 12b convey the sheet 30 between the printing drum 3 and the press roller 5, the feed roller 12a is lifted to prevent the sheet 30 from being loaded.
30 is released, closed again in synchronism with the rotation of the print drum 3, and driven after some time.

As described above, the stopper 47 may be lowered while the feed rollers 12a and 12b are closed.
When the paper feed start command is output immediately after the stopper 47 is lowered, the feed rollers 12a and 12b are not driven at this time, so that the paper 30 at the feed rollers 12a and 12b is not conveyed yet. Since the conveyance roller 55 of the conveyance path 56 starts to operate and the sheet 30 is bent to cause wrinkling of the sheet, it is necessary to wait for the output of the sheet feed start command until the feed rollers 12a and 12b are closed and driven. Therefore, the time from the lowering of the stopper 47 to the start of driving is set as a delay time, and then a paper feed start command is output. Since the operation of the feed rollers 12a and 12b is synchronized with the rotation of the printing drum 3, this delay time changes corresponding to the change of the printing speed of the printing apparatus 1, for example, the printing speed is 400 m.
In the case of m / sec to 1200 mm / sec, the time required for one cycle of rotation of the printing drum 3 is from 0.5 sec as shown in FIG.
The time from the closing of the feed rollers 12a and 12b to the start of driving is 0.096% of the time required for one cycle of rotation of the printing drum 3, so the delay time is 48 msec.
To 144 msec from this time, and from this time, a paper feed start command is output by selecting corresponding to the printing speed of the printing apparatus 1.

Further, since the operation of the feed rollers 12a and 12b is synchronized with the rotation of the printing drum 3, the feed roller 12
A drum sensor (not shown) for detecting the position of the printing drum 3 at the time when a and b start to be driven is provided, and a paper feed start command can be output by this output.

As described above, the range of the transport speed and the paper feed start timing (delay time) is set in advance, and the appropriate transport speed and the appropriate transport speed are set according to the information signals of the printing speed, the number of printed sheets, the used paper tray, etc. of the printer 1. Paper feed is performed by selecting paper feed data such as paper feed start timing.

At the same time, the paper feeding management means 70 controls the operation of the paper feeding device 2. First, the paper sensor 66,
When it is detected that there is no paper 30 at 67, the paper feed management means 70 outputs a separation start command to the separation rollers 51a and 51b by the separation drive unit 83, and it is detected that the paper 30 is present. Then, the separation stop command is output. When the drum sensor 54 detects the detection body 53 of the print drum 3, the paper feed management means 70 outputs a command for lowering the paper front end stopper 47 by the stopper drive unit 83, and there is no paper 30 at the paper sensor 68. When detected, a command for raising the sheet leading end stopper 47 is output. By turning off a tray selection switch (not shown), the vertical movement motor 41 of the paper feed bottom plates 18a, 18b of the selected paper feed trays 14a, 14b is connected to the paper feed bottom plate drive unit.
A drive start command is output by 81, and the paper feed bottom plates 18a, 18b are once raised by this command, and the paper feed bottom plates 18a, 18b
The presence or absence of the paper 30 on the sheet b is determined. When there is no paper, the paper feed bottom plates 18a and 18b are lowered, and when there is paper, the paper feed bottom plate 18a
18a and 18b are raised, and when the sheet 30 comes into contact with the separating rollers 51a and 51b and an appropriate pressure is applied, the raising is stopped.

In the above case, when the sheet 30 is conveyed to the feed rollers 12a and 12b, the states of the printing apparatus 1 and the sheet feeding apparatus 2 are not changed, but the sheet feeding tray used is changed. In this case, the paper feed bottom plate 18a or 18b of the set paper feed tray 14a or 14b is lowered, and the paper feed bottom plate 18a or 18b of the newly selected paper feed tray 14a or 14b.
When the sheet 30 comes into contact with the separating roller 51a or 51b and an appropriate pressure is applied, the raising is stopped. Then, a reset switch (not shown) of the printing machine is turned on to eject the paper 30 located at the feed rollers 12a and 12b, and convey the newly selected paper 30 to the feed rollers 12a and 12b. The transport data at this time is the same data as when the paper 30 is not present at the paper sensor 68.

The operation of the above will be described with reference to the flowcharts of FIGS. FIG. 10 shows a paper feed management routine of the paper feed management means 70. In step 1, when the paper feed tray selection switch on the operation panel (not shown) of the printing press is turned on, the output selects the upper tray 14a. If it is determined that the output of the same selection switch is the upper tray, the process proceeds to step 3 and the lower tray is
If it is 14b, go to step 2. In step 3, the paper feed bottom plate 18a of the upper tray 14a is raised and the paper feed bottom plate 18b of the lower tray 14b is lowered, and the process proceeds to step 4.
In step 4, the output of the paper sensor 68 provided at the feed rollers 12a, 12b determines the presence or absence of the paper 30, and when there is no paper, that is, the first paper 30 is fed to the input / output port 75. When the paper feed start signal of No. 1 is given, the process proceeds to step 5, and when the paper feed start signal of the first sheet 30 is not given to the input / output port 75, the process goes to step 6. In this step 6, it is determined whether or not there is the sheet 30 on the upper tray 14a. If the sheet 30 is present, the process proceeds to step 8, and if not, the process proceeds to step 7.
In step 7, the paper feed abnormality output routine shown in FIG. 15 is executed. In step 8, the transport path 56
It is determined whether or not the output of the paper sensor 66 provided in the paper is out of paper, and if there is no paper, the process proceeds to step 9, whereas if there is paper, the process proceeds to step 10.
Then, in step 9, the sheet separation drive unit 83 is driven and the process proceeds to step 10. In this step 10,
Whether the print start switch on the operation panel of the printing press is on or not is determined.
If it is off, the process returns to step 1, and in step 11, the paper feed / conveyance routine shown in FIG. 14 is executed.

Next, the paper feeding / conveying routine shown in FIG. 14 will be described. In the first step 12 of this routine, the output of the drum sensor 54 provided in the drive path of the printing drum 3 of the printing apparatus 1 determines whether or not the printing drum 3 is at a predetermined position, and a predetermined value is determined. When it is in the position, the process proceeds to step 13, and when it is not in the predetermined position, the process proceeds to step 14. In step 13, the printing conditions such as the printing speed and the number of printed sheets are read from the control board 78 of the printing apparatus 1, the paper feeding conditions are selected and stored in the memory area, and the process proceeds to step 14. In step 14, the sheet leading end stopper 47 located at the feed rollers 12a and 12b is closed, the sheet feeding motor drive data of the printing apparatus 1 is output to the sheet feeding motor drive unit 80, and the process proceeds to step 15. In step 15, the output of the paper sensor 68 provided on the transport path 56 advances to step 16 when there is no paper, and to step 17 when there is paper. Step
In 17, it is determined whether or not the feed motor drive data to the feed motor drive unit 80 is the last data, and when it is the last data, the process proceeds to step 18, where the last data If not, the process returns to step 14. In step 18, the paper feed motor drive unit 80 is reset and the process returns to the paper feed management routine.

Next, the paper feed abnormality output routine shown in FIG. 15 will be described. In the first step 19 of this routine, the abnormality information data stored in the RAM 73 is read, and then the process proceeds to step 20. In step 20, a drive unit stop command is output to the control board 78 of the printing apparatus 1, and after step 20, the process proceeds to step 21. In step 21, it is determined whether or not the reset switch on the operation panel of the printing press is on. When it is on, the process proceeds to step 22, while when it is off, the process returns to step 20, and in step 22. Is reset and returns to the paper feed management routine.

Thus, according to this first embodiment,
The printing machine uses a switch on the operation panel of the printing machine to select the printing speed, the number of sheets to print, and the size of paper used by the printing machine.
It is possible to change from low speed to high speed in synchronization with the speed of the printing device, and by sending at a high speed to the printing device, loss such as slip caused by feeding and conveying at high speed. It is also possible to prevent the occurrence of the deviation of the leading edge of the paper caused by the above.

In the second embodiment of the present invention shown in FIG. 16, speed detecting means 85 for detecting the actual rotation speed of the printing drum 3 is provided, and the paper feeding motor 61 of the paper feeding device 2 is a stepping motor. By directly using the speed information from the speed detecting means 85, a driver circuit for driving the stepping motor 61 is provided, and the speed of the paper feeding device 2 is changed steplessly so that the paper feeding speed is synchronized with the printing speed. Further, by counting the output of the speed detecting means 85 of the printing drum 3, the predetermined position of the printing drum 3 is detected, and the paper separating means of the paper feeding device 2 is operated to measure the paper feeding timing. It has become. The speed detecting means 85 has a gear 87 attached to a rotary shaft 86 of the printing drum 3, an encoder disk 89 is attached to a rotary shaft of a gear 88 meshing with the gear 87, and the photointerpreter 90 is not shown so as to sandwich the encoder disk 89. It is configured by the one provided on the machine frame.

In such a configuration, when the print drum 3 is rotated by the drive motor of the printing apparatus 1, the output of the photointerplater 90 becomes a serial rectangular wave as shown in FIG. Output to the state management board and input to the stepping motor drive circuit of the sheet feeding device 2. After being input to the stepping motor drive circuit, the excitation command for each phase of the stepping motor 61 is output using the timing of either the rising edge or the falling edge of the serial rectangular wave. As a result, when the print drum 3 rotates slowly, the interval of the excitation timing of each phase of the stepping motor 61 becomes longer in time, and the rotation speed of the stepping motor 61 slows down. The excitation timing of the stepping motor 61 is determined.

In this embodiment, the maximum peripheral speed of the printing drum 3 is 1200 mm / s and the number of revolutions at this time is 120 rpm, so the circumference of the printing drum 3 is 600 mm. Since the maximum rotation speed of the stepping motor 61 is set to 2000 pps, the 0.6 mm conveying roller rotates per one step angle of the stepping motor 61. Therefore, the encoder disk 89 has 1000 slits.
Here, for example, if the fifth speed (1200 mm) is selected on the operation panel (not shown) of the printing apparatus 1 and the actual speed is 1000 mm / s, the time required for the printing drum 3 to make one rotation is 600 (mm) /
1000 (mm / s) = 0.6 (s), and the time interval of one slit of the encoder disk 89 when the printing drum 3 rotates in this time is 600 μs, which is output to the stepping motor drive circuit of the paper feeding device 2. Excitation timing is 1
The cycle is 600 μs. Also at this time the stepping motor
61 speed is about 1667pps, 0.6mm per step angle
Since the feed rollers rotate, the feed feeding speed of the feeding device 2 is 10
It becomes 00.2 mm / s. Here, there is a speed deviation of 0.2 mm / s, but since the time for which the printing drum 3 makes one rotation is 600 msec, the amount of paper movement deviation during that time is 0.2 (mm / s) × 0.
Since 6 (s) = 0.12 mm, there is no risk of timing deviation or wrinkling unlike the paper feeding device of the conventional stencil printing machine. However, if the rotation speed is rapidly increased at the start of the rotation of the printing drum, the stepping motor 61 will be out of step, so it is necessary to gradually increase the speed. However, the conventional printing machine has a large load on the drive system, and since the rotational speed of the printing drum 3 is gradually increased in order to reliably perform the printing process, there is no problem.

In this way, the printing drum 3 of the printing apparatus 1 is
At the same time that the paper is rotated, the transport rollers of the paper feeding device 2 start to rotate, and rotate at the same speed as the print drum 3 until printing is completed. Before the printing is started, the paper feed tray 14 selected in advance on the operation panel of the printing apparatus 1 (not shown).
The paper is separated from a and b by the preset number of prints and is passed to the transport path. As for the separation timing, the separation is started by detecting a predetermined position on the circumference of the printing drum 3 as in the conventional paper feeding device. Also when separated
The rotations of 51a and 51b are stopped when the leading edge of the sheet 30 is detected by the sheet jam detection sensor provided at the conveyance roller 55 closest to the exit of the sheet feeding tray 14a and 14b. Even if the separating rollers 51a and 51b are stopped, the one-way clutch rotates together with the sheet conveyed to the conveying path. Then, the sheet 30 is fed and conveyed in the same manner as the conventional sheet feeder to supply the sheet 30 to the printer 1.

Further, by counting the serial rectangular wave output of the photointerpreter 90 for detecting the rotation speed of the print drum 3, it is possible to detect the predetermined position of the print drum 3. As described above, when the rotation speed of the printing drum 3 becomes slower, the output pulse width of the photointerpreter 90 becomes longer in time, so that the separation start from the respective paper feed trays 14a and 14b having different paper transport distances is started. By setting the count number in advance through an experiment, the separation timing is started at the optimum position of the printing drum 3 even if the printing speed varies, and the paper feeding timing is longer than the method in which the separation start timing is determined by the conventional time. The accuracy of is improved.

As described above, according to this embodiment, the printing apparatus 1 simply selects the printing speed, the number of printed sheets, and the used paper size by the switch on the operation panel of the printing machine for the paper feed tray on which the paper is stacked. Not the print drum 3
The actual rotation speed of the sheet feeding device 2 is detected and the drive motor 61 of the sheet feeding device 2 is detected.
By using the stepping motor as the stepping motor, the printer 1 and the sheet feeding device 2 can accurately cope with the same speed from low speed to high speed without being influenced by the change of environment or the change of printing speed between products. Therefore, it is possible to prevent the timing deviation and the generation of wrinkles due to the difference in the sheet conveying speed between the sheet and the sheet. In each of the above-described embodiments, the paper feeding device 2 is provided at the lower part of the printing device 1, but it may be provided at a place other than this, and each member is not limited to that shown in the embodiments. Absent.

[0035]

The present invention is as described above, and the invention of claim 1 is such that a stencil sheet is mounted on the outer periphery, and a porous printing drum having an ink supply means inside, and a sheet on this printing drum. A printing device having a pressing roller for pressing;
The printing apparatus includes a paper feeding device that feeds paper between a printing drum and a press roller. The paper feeding device includes a pull-out type paper feeding tray housed in a paper feeding table and a paper feeding tray. A detecting unit that has a separating unit that separates the stacked sheets and a feeding unit that feeds the separated sheets to the printing apparatus main body; and a detecting unit that detects the state of the printing apparatus main body of the printing apparatus; A determination unit that determines the conditions to be set according to the state, an output unit that provides various information to the printing apparatus main body, and a storage unit that stores a plurality of sheet feeding speeds and other setting data obtained in advance by experiments. Have,
Since a plurality of paper feed speeds are set corresponding to a plurality of printing speeds of the printing apparatus main body, high-speed operation of the printing apparatus can be achieved and printing efficiency can be improved, and the entire apparatus is large. Therefore, there is an advantage that a large installation space is not required. The invention of claim 2 has the same effect as the invention of claim 1, because in the invention of claim 1, the feeding speed of the paper feeding device is set faster than the printing speed of the printing device. In addition to
There is an effect that it is possible to eliminate a loss such as a slip that occurs when a sheet is conveyed from the sheet feeding device. The invention of claim 3 has the same effect as the invention of claim 1, because in the invention of claim 1, a stopper for aligning the leading ends of the paper is provided at the feed roller for supplying the paper to the printing drum. In addition to the above, there is an effect that it is possible to prevent the leading edge of the paper from being displaced when the paper feeding device is connected to the printing device, and to drive the printing device and the paper feeding device in synchronization. According to the invention of claim 4, in the invention of claim 1, since the feeding is started with a delay of a predetermined time from the time when the predetermined position of the printing drum is detected, the same effect as that of the invention of claim 1 is obtained. In addition to the above, by detecting only one predetermined position of the print drum of the printing apparatus, the drive command output and the paper feed of the paper leading edge alignment stopper can be performed with each delay time for a plurality of printing speeds. There is an effect that the timing of the start timing command output can be detected. The invention of claim 5 relates to claim 1
In the invention of claim 1, since the paper feed is started before the printing process is started by the print start key, in addition to the same effect as the invention of claim 1, before the paper feed device is connected. There is an effect that it is possible to prevent the delay of the sheet feeding timing of the sheet feeding device due to the difference in the moving distance of the first sheet fed by the printing device. According to the invention of claim 6, in the invention of claim 1, the first first sheet to be fed is fed at the maximum speed of the sheet feeding device regardless of the setting conditions of the printing machine. Therefore, in addition to having the same effect as the invention of claim 1, the effect that the printing device can start the printing process earliest in the paper feeding device after pressing the printing start key of the printing device There is. According to a seventh aspect of the present invention, a stencil sheet is mounted on the outer periphery of the stencil sheet, a porous printing drum having an ink supply means inside, a printing roller having a press roller for pressing the printing sheet against the printing drum, and printing by the printing apparatus. A paper feeding device that feeds paper between the drum and the press roller is provided, and the paper feeding device stores a drawer type paper feeding tray housed in a paper feeding table and the paper loaded on the paper feeding tray. It has a separating means for separating and a feeding means for feeding the separated paper to the printing apparatus main body, a speed detecting means for detecting the actual rotation speed of the printing drum is provided, and the paper feeding motor of the paper feeding apparatus is provided. A stepping motor is used, a driver circuit for driving the stepping motor is provided by directly using the speed information from the speed detecting means, and the speed of the sheet feeding device is continuously changed.
Since the paper feed speed is synchronized with the print speed, the print speed of the printing device can be changed and the paper feed speed of the paper feed device can be automatically changed. Multiple printing speeds can be set even in the printing device connected to the printer, and even if the actual printing speed of the printing device differs greatly from the default printing speed, the paper feeding speed of the paper feeding device is automatically set. The printing speed is changed to the same as the printing speed of 1., and thus it is possible to prevent the occurrence of wrinkles due to a paper feed error or an excessive amount of bending due to a speed difference between the printing device and the paper feeding device. The invention of claim 8 is
In the invention of claim 7, the predetermined position of the print drum is detected by counting the output of the speed detection means of the print drum, and the paper separating means of the paper feeding device is operated to measure the paper feeding timing. In addition to having the same effect as the effect of the invention of Item 7, in the prior art, the separation timing is determined by the time from one point of the printing drum, so the accuracy of the separation start timing is inferior. ,
According to the movement of the print drum, the separation start timing is delayed when the rotation speed is slow, and when the rotation speed is fast, the separation start timing is advanced to improve the accuracy of the separation start timing.

[Brief description of drawings]

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

FIG. 2 is a front view of the above-described sheet leading edge alignment stopper portion.

FIG. 3 is a side view of the above.

FIG. 4 is a perspective view of a part of the above printing drum.

FIG. 5 is a rear view of the sheet feeding device shown in FIG.

FIG. 6 is a perspective view of the above separating roller portion.

FIG. 7 is a side view of the above.

FIG. 8 is a control circuit diagram of the above.

FIG. 9 is a velocity correlation diagram between the printing apparatus and the sheet feeding apparatus of the above.

FIG. 10 is a flowchart of a paper feed management routine of the same.

FIG. 11 is a flowchart of a sheet feeding / conveying routine of the same.

FIG. 12 is a flowchart of a paper feeding device abnormality output routine of the same.

FIG. 13 is a front view of a main part of a paper feeding device of a printing machine of the same type as that of the present invention.

FIG. 14 is a perspective view of the above.

FIG. 15 is a partial perspective view of the above.

FIG. 16 is a perspective view of a main part of the second embodiment of the present invention.

FIG. 17 is an output diagram of the above photointerpreter.

FIG. 18 is a front view of a conventional paper feeding device of a printing machine of the same kind as the present invention.

[Explanation of symbols]

 1 Printing Device 2 Paper Feeding Device 3 Paper Feeding Table 4 Paper Feeding Tray 5 Paper Feeding Tray Main Body 7 Paper Feeding Stand 8 Paper Feeding 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 Suppressor 37 CPU 38 RAM 85 Printing drum speed detector 90 Incoder disk 91 Photointerpreter

Claims (8)

[Claims] 1. A printing apparatus having a stencil sheet mounted on the outer periphery thereof, a porous printing drum having an ink supply means inside, and a press roller for pressing the sheet against the printing drum,
The printing apparatus includes a paper feeding device that feeds paper between a printing drum and a press roller. The paper feeding device includes a pull-out type paper feeding tray housed in a paper feeding table and a paper feeding tray. In a stencil printing machine having a separating means for separating the stacked sheets of paper and a feeding means for feeding the separated sheets of paper to the printing apparatus main body, a detection means for detecting the state of the printing apparatus main body of the printing apparatus, Judgment means for judging the condition to be set according to the detected state, output means for providing various information to the printing apparatus main body, a plurality of paper feed speeds and other setting data previously obtained by experiments are stored. A stencil printing machine, comprising: a storage unit, wherein a plurality of paper feed speeds are set corresponding to a plurality of printing speeds of the printing apparatus main body. 2. The stencil printing machine according to claim 1, wherein the paper feeding speed of the paper feeding device is set faster than the printing speed of the printing device. 3. The stencil printing machine according to claim 1, wherein a stopper for aligning the leading ends of the paper is provided at a feed roller for supplying the paper to the printing drum. 4. The stencil printing machine according to claim 1, wherein the paper feeding is started with a predetermined delay from the time when the predetermined position of the printing drum is detected. 5. The stencil printing machine according to claim 1, wherein the feeding is started by the print start key before the printing process is started. 6. The stencil printing machine according to claim 1, wherein the first sheet to be fed is fed at the maximum speed of the sheet feeding device regardless of the setting conditions of the printing machine. 7. A printing device having a stencil sheet mounted on the outer periphery thereof, a porous printing drum having an ink supply means inside, and a press roller for pressing the sheet against the printing drum,
The printing apparatus includes a paper feeding device that feeds paper between a printing drum and a press roller. The paper feeding device includes a pull-out type paper feeding tray housed in a paper feeding table and a paper feeding tray. In a stencil printing machine having a separating means for separating the stacked sheets and a feeding means for feeding the separated sheets to the printing apparatus main body, a speed detecting means for detecting an actual rotation speed of the printing drum is provided. The sheet feeding motor of the sheet feeding device is composed of a stepping motor, and the driver circuit for driving the stepping motor is provided by directly using the speed information from the velocity detecting means to continuously change the speed of the sheet feeding device. , A stencil printing machine characterized by synchronizing a paper feeding speed with a printing speed. 8. A stencil according to claim 7, wherein a predetermined position of the print drum is detected by counting the output of the speed detecting means of the print drum, and the paper separating means of the paper feeding device is operated to measure the paper feeding timing. Printer.