JP3291065B2 - Stencil printing machine - Google Patents

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, and more particularly to a stencil printing machine having a paper feed mechanism for feeding printing paper one by one.

[0002]

2. Description of the Related Art Conventionally, in a stencil printing machine provided with a paper feed mechanism for supplying unprinted sheets one by one between a printing drum and a press roller, two or more sheets overlap. There was no device provided with a means for detecting such a situation when supplied.

On the other hand, in copiers and other devices,
Various types of devices having a mechanism for transporting sheets of a fixed shape and a constant thickness one by one are known, and among them, it is detected that two or more sheets are transported in an overlapping manner (double feed). In some cases, the operation of the paper transport mechanism is stopped.

[0004] As described above, if the apparatus is stopped each time there is a double feed of paper, the operation efficiency is remarkably reduced particularly in the case of an apparatus which repeats its operation continuously, such as a printing press. Not preferred. Therefore, especially in the field of printing presses, even if there is a multi-feed of paper, the position of the multi-fed paper can be identified after printing of a desired number of sheets has been completed without stopping the apparatus, and blank paper can be identified from that portion. It is desired to have a printing press that can be easily removed by post-processing.

The present invention has been made in view of the above-mentioned conventional technical problems, and has been devised to effectively solve the problems.
Therefore, a first object of the present invention is to provide a stencil printing machine having a function of detecting double feeding of printing paper.

It is another object of the present invention to provide a stencil printing machine which stops the supply of printing paper when double feeding of printing paper is detected.

Another object of the present invention is to provide a stencil printing machine capable of identifying the location of the multi-fed paper after the completion of printing the desired number of papers without stopping the paper supply when the multi-feed of the printing paper is detected. Is to provide.

Still another object of the present invention is to provide a stencil printing machine used with an external device, which detects a double feed of printing paper and outputs a detection signal to the external device so that the external device can be used effectively. An object of the present invention is to provide a stencil printing machine that can be used.

Still another object of the present invention is to provide a stencil printing machine capable of selectively functioning a double feed detecting mechanism for sheets.

Still another object of the present invention is to provide a stencil printing machine having a function of accurately and surely detecting double feeding of printing paper.

[0011]

SUMMARY OF THE INVENTION A stencil printing machine according to the present invention has the following arrangement in order to solve the above-mentioned problems of the prior art for children and to achieve the object. That is,
In a stencil printing machine having a paper feed mechanism for supplying printing paper between a printing drum and a press roller, the paper feeding mechanism is configured to pull out one sheet at a time from the sheet bundle to form a top sheet of the sheet bundle. A feed roller that is in contact with, and a registration roller that is disposed immediately before the print drum and the press roller and is intermittently driven to rotate at a timing of supplying paper between the print drum and the press roller; Double feed detecting means for detecting a state in which the printing papers are supplied in an overlapping manner. Further, the double feed detecting means includes a light emitting element and a light receiving element provided at a position crossing a passage path through which the printing paper is supplied between the paper feeding roller and the registration roller. The driving of the paper feed roller is stopped when the registration roller starts rotating, so that when the slack of the printing paper is removed by the rotation of the registration roller, the light emitting element and the light receiving element are turned off. It is configured to measure the amount of transmitted light of the printing paper.

[0012] It is preferable that the feed mechanism stops the supply of the printing paper when the double feed detecting means outputs a double feed detection signal.

In the stencil printing machine according to the present invention, the double feed detecting means outputs a double feed detection signal for activating post-processing means while permitting continuation of printing. It is preferable that, when a double feed detection signal is input, the printing paper supplied overlapped is distinguished from other printing papers.

In the case where the post-processing means distinguishes the overlappingly supplied printing paper from other printing papers, the processing means then determines that the multi-fed paper is a different paper than the regular paper receiving means. It can be a sorter that discharges to the receiving means. Alternatively, the processing means may be a classifier for applying a mark tape to the position of the multi-fed sheet.

Further, the stencil printing machine according to the present invention described above may further comprise an output terminal for outputting the output signal of the double feed detecting means to an external device.
In that case, the external device may be a sorter that discharges the multi-fed paper to a paper receiving unit different from the regular paper receiving unit. Alternatively, the external device can be a sorter that applies a mark tape to the location of the multi-fed paper.

In the stencil printing machine according to the present invention, the double feed detecting means may output a double feed detection signal to an external device.

The stencil printing machine according to the present invention may be provided with switch means for selectively switching the operation state and the non-operation state of the double feed detecting means.

[0018]

In the stencil printing machine according to the present invention, when the paper feed mechanism feeds the printing paper in an overlapping state, it can be detected, and various measures can be taken. As one of the countermeasures, it is effective to stop paper feeding.

In another stencil printing machine according to the present invention, when the paper feed mechanism supplies printing paper in an overlapping state, it is possible to detect that fact. Even when the detection signal is output, printing is continued to the end without stopping, and at the same time, post-processing means such as a sorter or a tape sorter is operated. The post-processing means discharges the multi-fed paper to a special shelf or a tape serving as a mark at the location of the multi-fed paper so that the multi-fed paper can be distinguished from other papers. Or sandwich it. Therefore, printing is not interrupted by the double feed, and the paper that has been blank fed by the double feed can be easily identified after the printing is completed, and it is easy to select and remove it.

In another stencil printing machine according to the present invention, when the paper feeding mechanism supplies printing paper in an overlapping state, it can detect that. Further, since the detection signal can be output to an external device, it can be used together with a sorter or a tape sorter.

Further, in another stencil printing machine according to the present invention,
When the paper feed mechanism supplies printing paper in an overlapping state,
That can be detected. Further, the detection function can be selectively turned on and off when necessary and unnecessary.

In another stencil printing machine according to the present invention,
When the paper feed mechanism supplies printing paper in an overlapping state,
That can be detected. The double feed of paper is detected by measuring the amount of transmitted light of the paper passing between the issuing element and the light receiving element, and the detection timing is set when the paper is in a tensioned state under tension. . In this state, there is no fluttering of the paper, no gap is generated between the papers, a stable measured value of the transmitted light amount is always obtained, and the double feed can be reliably detected.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a stencil printing machine according to the present invention will be described below with reference to FIGS.

FIG. 1 is an explanatory view schematically showing the internal structure of a stencil printing machine according to the present embodiment. A drum unit A including a printing drum 1 and a press roller 2 is disposed substantially at the center of the apparatus. The press roller 2 is supported so as to be in contact with and separate from the printing drum 1, and comes into contact with the printing drum 1 when a print sheet is sandwiched between the printing drum 1 and printing. At other times, it is separated from the drum 1. A scanner unit B having a CCD sensor 3, a lens 4, a fluorescent lamp 5, and a mirror 6 is provided at the upper part of the apparatus. Reference numeral 7 denotes a document holding plate. The plate feeding unit C includes a master roll paper 8, a thermal head 9, a platen roller 10, a cutter 11, and a sponge roller 12. On the opposite side of the plate feeding unit C with the drum unit A therebetween, a plate removing unit D is arranged. Reference numeral 13 denotes a winding core for winding the discharged plate. Provided substantially below the drum unit A is a suction fan unit E, on which the printed drum 1 is printed.
It is configured to suck and discharge the sheet peeled from the sheet. Although the details will be described later, a paper feed unit F is arranged substantially directly below the plate feeding unit C, and is configured to supply the printing paper to the drum unit A one by one. A paper receiving unit G is disposed on the opposite side of the paper feeding unit F with the drum unit A therebetween. Reference numeral 14 denotes a jump table for jumping and discharging printed paper, and reference numeral 15 denotes a paper receiving guide. In addition,
The printing drum 1 has a master clamp 16 for gripping the leading end of the printing plate. Further, a paper peeling claw 17 for peeling the printed paper from the drum 1 is provided at a position where the printing drum 1 faces the jump stand 14.

Next, the paper feeding unit F for supplying the printing paper to the drum unit A one by one will be described in detail with reference to FIGS. Unprinted paper bundle P
(See FIG. 2) is placed on the paper feed plate 21. Paper feed plate 21
Is biased upward so as to rise as the number of print sheets decreases, so that the uppermost sheet of the sheet bundle P always contacts the sheet feed roller 22. The sheet bundle P on the sheet supply plate 21 rises with its front edge along the guide plate 23, and the sheet supply roller 22 is located just above the guide plate 23. Between the upper edge of the guide plate 23 and the paper feed roller 22, the paper 3 that the paper feed roller 22 pulls out from the paper bundle P
A separating plate 24 for separating 0s one by one is arranged (see FIG. 2). Paper 3 pulled out from paper feed roller 22
A pair of registration rollers 25 are provided forward in the traveling direction of 0. The registration roller 25 is intermittently driven so as to rotate at the timing of supplying the sheet 30 between the printing drum 1 and the press roller 2. The paper 30 sent from the paper feed roller 22 is inserted between the registration rollers 25 that are not rotating, and the length of the paper 30 is longer than the distance to the registration rollers 25. This is because the sheet 30 is inserted between the registration rollers 25 in a slightly bent state (see FIG. 3).
The stiffness of the paper 30 causes the paper 30
Therefore, when the registration roller 25 starts to rotate at a predetermined timing, the paper 30 is surely caught between the registration rollers 25 (see FIG. 4). The registration roller 2
When the roller 5 starts rotating, the driving of the paper feed roller 22 is stopped. As long as the sheet 30 exists between the rollers 22 and 25, the registration roller 25 is driven and the paper feed roller 22 is driven. In the drawing, reference numeral 26 denotes a guide for guiding the leading end of the sheet 30 between the registration rollers 25. At a position immediately before the paper 30 is inserted between the registration rollers 25, the paper 3
A light emitting element 27 and a light receiving element 28 for detecting the double feeding of 0 are arranged above and below the paper path. The paper 30 sent by the registration roller 25 is inserted between the print drum 1 and the press roller 2, and at that timing, the press roller 2 rises and sandwiches the paper 30 between the print drum 1 and the print drum 1 (see FIG. 5). ). At this time, the registration roller 25 is set in a state where the sheet 30 is no longer slack.
, The paper 30 is in the most stable state and does not flutter, and the above-described light-emitting element 27 and light-receiving element 28 perform double feed detection. From the state shown in FIG. 5, the printing drum 1 and the press roller 2 are respectively driven to rotate, and at the same time, the driving of the registration roller 25 is stopped and the registration roller 25 is driven. The paper 30 is discharged while being printed (see FIG. 6).

The above-described light receiving element 28 is a well-known double feed detecting circuit (not shown) (for example, Japanese Patent Laid-Open No. 58-212539).
No. 1) via an amplifier circuit and the like. In this double feed detection circuit, the presence or absence of double feed is determined by comparing the amount of transmitted light detected when a sheet passes between the light emitting element 27 and the light receiving element 28 between a certain sheet and the next sheet. Is detected. It is of course possible to stop printing by outputting a detection signal from the double feed detection circuit,
As will be described later, it is possible to operate a post-processing device such as a sorter or a tape sorter and to continue printing. The double feed detection circuit can be switched on / off by a switch, and the double feed detection function can be canceled by turning off the switch.

In the apparatus of this embodiment, the output terminal of the double feed detecting circuit is taken out as an external terminal, and when a post-processing device such as a sorter or a tape sorter is used as an accessory, these post-processing devices are used. To output a double feed detection signal. When a double feed of paper is detected, a detection signal is output from the double feed detection circuit to these post-processing devices, and in the case of a sorter, the double fed paper is discharged to another shelf, and in the case of a tape sorter, The tape is pinched at the position of the multi-fed paper. Then, even if the multi-feeding of the sheets is detected, the printing itself is not stopped, but is continued until the printing of the first set number of sheets is completed. Therefore, when a sorter is connected, blank paper may be removed from the paper ejected to another shelf, and when a tape sorter is connected, blank paper may be removed from the portion where the tape is sandwiched. . In this way, even if there is a double feed of paper, printing is continued to the end without being stopped halfway, and blank paper removal after printing is completed is easy.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a stencil printing machine according to the present invention;
It is explanatory drawing which shows the internal structure typically.

FIG. 2 shows an embodiment of a stencil printing machine according to the present invention;
FIG. 4 is a diagram illustrating a series of operating states of a sheet feeding unit.

FIG. 3 shows an embodiment of a stencil printing machine according to the present invention;
FIG. 4 is a diagram illustrating a series of operating states of a sheet feeding unit.

FIG. 4 shows an embodiment of a stencil printing machine according to the present invention;
FIG. 4 is a diagram illustrating a series of operating states of a sheet feeding unit.

FIG. 5 shows an embodiment of a stencil printing machine according to the present invention;
FIG. 4 is a diagram illustrating a series of operating states of a sheet feeding unit.

FIG. 6 shows an embodiment of a stencil printing machine according to the present invention.
FIG. 4 is a diagram illustrating a series of operating states of a sheet feeding unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Printing drum 2 Press roller 3 CCD sensor 4 Lens 5 Fluorescent lamp 6 Mirror 7 Original press plate 8 Master roll paper 9 Thermal head 10 Platen roller 11 Cutter 12 Sponge roller 13 Core 14 Jump stand 15 Paper receiving guide 16 Master clamp 17 Paper Peeling nail 21 Paper feed plate 22 Paper feed roller 23 Guide plate 24 Release plate 25 Registration roller 26 Guide 27 Light emitting element 28 Light receiving element 30 Paper

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-72250 (JP, A) JP-A-3-259847 (JP, A) JP-A-3-182448 (JP, A) JP-A-2- 243443 (JP, A) JP-A-1-210364 (JP, A) JP-A-63-225050 (JP, A) JP-A-63-185754 (JP, A) JP-A-57-185153 (JP, A) JP-A-57-124366 (JP, A) JP-A-63-306142 (JP, A) JP-A-4-1850 (JP, U) JP-A-2-85178 (JP, U) JP-A-2-57854 (JP, U) JP-A 1-1115647 (JP, U) JP-A 58-191157 (JP, U) JP-A 55-67035 (JP, U) (58) Fields investigated (Int. Cl. ⁷⁾ B41L 13/04 B41F 21/00 B65H 7/12 B41J 13/00

Claims (10)

(57) [Claims] 1. Printing between a printing drum and a press roller
In a stencil printing machine having a paper feed mechanism for feeding paper
The paper feed mechanism pulls out the sheets one by one from the sheet bundle.
A paper feed roller for contacting the uppermost sheet of the sheet bundle in order to
Located just before the printing drum and press roller
A sheet supply device for supplying paper between the printing drum and the press roller.
A resist that is driven intermittently so that it rotates with the image
Detects the state in which the rollers and the printing paper
Double feed detection means, wherein the double feed detection means includes the paper feed roller and the registration roller.
Traversing the path through which the printing paper is supplied to the printer
A light-emitting element and a light-receiving element provided at a position where the registration roller starts rotating.
When the driving of the registration roller is stopped, the registration roller
When the slack of the printing paper is removed by the rotation of
The light emitting element and the light receiving element determine the amount of transmitted light of the printing paper.
A stencil printing machine characterized by measuring. 2. The stencil printing machine according to claim 1, wherein the paper feed mechanism unit stops the supply of the printing paper when the double feed detection unit outputs a double feed detection signal. 3. The upper SL double feed detection means outputs a double feed detection signal to activate the post-processing means while allowing the continuation of printing, the post-processing means, when the double feed detection signal is input ,
2. The stencil printing machine according to claim 1, wherein the printing paper supplied in an overlapping manner is distinguished from other printing papers. 4. The post-processing means according to claim 1, wherein the multi-fed paper is
4. The stencil printing machine according to claim 3, wherein the stencil printing machine is a sorter for discharging the paper to another paper receiving means other than the regular paper receiving means. 5. The stencil printing machine according to claim 3, wherein said post-processing means is a sorter for applying a mark tape to a position of a multi-fed sheet. 6. The upper Symbol hole <br/> plate printing machine according to claim 1, wherein the output signal has further an output terminal for outputting to an external device double feed detecting means. 7. The stencil printing machine according to claim 6, wherein said external device is a sorter for discharging the multi-fed paper to a paper receiving means different from a regular paper receiving means. 8. The stencil printing machine according to claim 6, wherein the external device is a sorter for applying a mark tape to a position of the multi-fed paper. 9. The upper SL double feed detecting means, stencil printing machine according to claim 1, wherein outputting the double feed detection signal to an external device. 10. Tei includes an upper SL switch means selectively switches the operating state and the non-operating state of the multi-feed detecting means
A stencil printing machine according to claim 1 .