JPH06270525A - Stencil printer - Google Patents

Abstract

PURPOSE:To enable duplicate feed-detection and paper feed-stopping to be carried out by a method wherein a duplicate feed-detecting means is provided to a paper feed mechanism part to stop paper feed based on a duplicate feed detection signal. CONSTITUTION:Paper is supplied between a printing drum 1 and a press roller 2 from a bundle of unprinted paper P through resist rollers 25, 25, and printed. A duplicate feed-detecting means is formed by arranging a light emitting device 27 and a light receiving device 28 just before on an upperstream side of the resist rollers 25, 25 near a guide 26 guiding the supplied paper 30. The paper 30 sent with the resist rollers 25, 25 is inserted between the printing drum 1 and the press roller 2. Presence of the duplicate feed is detected with the light emitting device 27 and the light receiving device 28 at timing when the press roller 2 ascends to pinch the paper 30 between the press roller 2 and the printing drum 1 and tension is applied thereto. When the duplicate feed is detected, the resist rollers are stopped to make a driven state, and the paper feed is stopped. Thereby, the paper 30 is discharged while being printed.

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 having a paper feed mechanism for supplying unprinted paper one by one between a printing drum and a press roller, two or more papers are overlapped. There was no means to detect it when supplied.

On the other hand, in copying machines and other devices,
Various types are known that are equipped with a mechanism that conveys sheets of a fixed shape and a fixed thickness one by one. Among them, it is detected that two or more sheets are overlapped (conveyed), and at that time. There are some which stop the operation of the paper transport mechanism.

As described above, since the apparatus is stopped every time there is a double feed of paper, the working efficiency is remarkably reduced particularly in the case of an apparatus which repeats continuous operation such as a printing press. Not preferable. Therefore, especially in the field of printing machines, even if there is a double feed of paper, the position of the double fed paper can be identified after the printing of the desired number of sheets is completed without stopping the device, and a blank sheet can be detected from that part. It is desirable to have a printing press that can be easily removed by post-treatment.

The present invention has been made in view of the above-mentioned conventional technical problems, and was 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.

Another object of the present invention is to provide a stencil printing machine that stops the supply of printing paper when a double feed of printing paper is detected.

Another object of the present invention is to provide a stencil printing machine capable of identifying the position of the double-fed sheets of paper after the completion of printing of the desired number of sheets of paper without stopping the supply of the sheet of paper when the double-feeding of printing sheets is detected. To provide.

Still another object of the present invention is, when using the stencil printing machine together with an external device, when the double feeding of the printing paper is detected, the detection signal is output to the external device so that the external device is also effective. It 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 in which a double feed detection mechanism for sheets can be selectively operated.

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

[0011]

A stencil printing machine according to the present invention has the following constitution in order to solve the above-mentioned problems of the prior art and to achieve the object. That is,
In a stencil printing machine having a paper feed mechanism unit for supplying print paper between a print drum and a press roller, the paper feed mechanism unit includes a double-feed detection unit for detecting a state in which print papers are overlapped and supplied. ing.

In the paper feeding mechanism section, it is preferable that the feeding of the printing paper is stopped by the double feeding detecting means outputting a double feeding detection signal.

Another stencil printing machine according to the present invention is a stencil printing machine having a paper feed mechanism portion for supplying printing paper between a printing drum and a press roller, wherein the paper feed mechanism portion is
The multi-feed detecting means for detecting a state where the print sheets are supplied in an overlapping manner is provided, and the multi-feed detecting means outputs a multi-feed detecting signal for operating the post-processing means while allowing the printing to continue, and the post-processing The means is configured to distinguish the overlapped and supplied print sheets from other print sheets when the double feed detection signal is input.

In still another stencil printing machine according to the present invention,
In a stencil printing machine having a paper feed mechanism portion that feeds print paper between a print drum and a press roller, the paper feed mechanism portion includes a double feed detection unit that detects a state in which print paper sheets are overlapped and fed, And an output end for outputting the output signal of the double feed detecting means to an external device.

Further, in another stencil printing machine of the present invention, in the stencil printing machine having a paper feed mechanism portion for feeding the print paper between the printing drum and the press roller, the paper feed mechanism portion is The multi-feed detecting means for detecting the overlapped and fed state is provided, and the multi-feed detecting means is configured to output a multi-feed detection signal to an external device.

Further, in another stencil printing machine of the present invention, in the stencil printing machine having a paper feeding mechanism portion for supplying the printing paper between the printing drum and the press roller, the paper feeding mechanism portion is It is provided with a double feed detecting means for detecting the state of being overlapped and supplied, and a switch means for selectively switching the operating state and the non-operating state of the double feed detecting means.

According to still another stencil printing machine of the present invention, in the stencil printing machine having a paper feed mechanism portion for supplying the print paper between the printing drum and the press roller, the paper feed mechanism portion has the print papers overlapped with each other. And a light-receiving element that is provided at a position that traverses a passage through which the printing paper is supplied. The light receiving element is configured to measure the amount of transmitted light of the printing paper when the printing paper passes through the path while being under tension.

[0018]

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

In another stencil printing machine according to the present invention, when the paper feeding mechanism supplies the printing papers in an overlapping state, it can be detected. Further, even when the detection signal is output, the printing is continued to the end without being stopped, and at the same time, the post-processing means such as a sorter or a tape sorter is activated. The post-processing means discharges the double-fed sheets to a special shelf so that the sheet in the double-fed portion can be distinguished from other sheets, or a tape that serves as a mark at the double-fed sheet portion. Sandwiches. Therefore, the printing is not interrupted by the double feeding, and the sheet that has been double fed and becomes blank can be easily identified after the printing is completed, and it is easy to select and remove the sheet.

In another stencil printing machine according to the present invention, when the paper feeding mechanism feeds the printing papers in an overlapping state, this can be detected. Moreover, since the detection signal can be output to an external device, it can be used in combination with a sorter or a tape sorter.

Furthermore, in another stencil printing machine according to the present invention,
When the paper feed mechanism supplies printing paper
That can be detected. Further, the detection function can be selectively turned on and off when necessary or not.

In another stencil printing machine according to the present invention,
When the paper feed mechanism supplies printing paper
That can be detected. Double feeding of paper is detected by measuring the amount of transmitted light of the paper that passes between the light emitting element and the light receiving element. The detection timing is when the paper is under tension due to tension. . In this state, there is no fluttering of the sheets, no gaps are formed between the sheets, and a stable measurement value of the transmitted light amount is always obtained, and reliable double feed detection can be performed.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the 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 the stencil printing machine of this embodiment. A drum unit A including a printing drum 1 and a press roller 2 is arranged in the approximate center of the apparatus. The press roller 2 is supported so as to come into contact with and separate from the printing drum 1, and comes into contact with the printing drum 1 when a printing sheet is sandwiched between the printing roller 1 and the printing to print. 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 above the device. Reference numeral 7 is a document pressing plate. The plate supply unit C includes a master roll paper 8, a thermal head 9, a platen roller 10, a cutter 11 and a sponge roller 12. A plate removing unit D is arranged on the opposite side of the plate supplying unit C with the drum unit A interposed therebetween. Reference numeral 13 is a core for winding the discharged plate. The suction fan unit E is provided substantially below the drum unit A, and is printed by the printing drum 1.
The sheet peeled off from the sheet is sucked and discharged. Although details will be described later, a sheet feeding unit F is arranged substantially directly below the plate feeding unit C, and is configured to feed the printing sheets to the drum unit A one by one. Further, a paper receiving unit G is arranged on the opposite side of the paper feeding unit F with the drum unit A in between. Reference numeral 14 is a jump base for jumping and ejecting printed paper, and 15 is a paper receiving guide. In addition,
The printing drum 1 has a master clamp 16 that holds the leading end of the plate base paper. 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 base 14.

Next, the paper feed unit F for feeding the printing paper to the drum unit A one by one will be described in detail with reference to FIGS. 2 to 6 in addition to FIG. Unprinted sheet bundle P
(See FIG. 2) is placed on the paper feed plate 21. Paper feed plate 21
Is urged upward so as to rise as the number of printing sheets decreases, and the uppermost sheet of the sheet bundle P is always in contact with the sheet feeding roller 22. The sheet bundle P on the sheet feed plate 21 rises with its front edge along the guide plate 23, and the sheet feed 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 pulled out from the paper stack P by the paper feed roller 22.
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 is provided on the front side in the traveling direction of 0. The registration roller 25 is intermittently driven so as to rotate at the timing when the sheet 30 is supplied between the printing drum 1 and the press roller 2. Then, the sheet 30 sent out from the sheet feeding roller 22 is inserted between the registration rollers 25 which are not rotating, but the sending length is longer than the distance to the registration rollers 25. This is because when the paper 30 is inserted between the registration rollers 25 with the paper 30 slightly bent (see FIG. 3), the paper 30
The rigidity of the sheet itself causes the sheet 30 to be in the registration roller 25.
Therefore, when the registration rollers 25 start rotating at a predetermined timing, the sheet 30 is surely caught between the registration rollers 25 (see FIG. 4). The registration roller 2
When the sheet 5 starts to rotate, the driving of the paper feed roller 22 is stopped, and when the paper 30 is present between the rollers 22 and 25, the registration roller 25 is the driving side and the paper feed roller 22 is the driven side. Reference numeral 26 in the drawing is a guide for guiding the leading end of the sheet 30 between the registration rollers 25. At the position immediately before the sheet 30 is inserted between the registration rollers 25, the sheet 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 printing drum 1 and the press roller 2, and at that timing, the press roller 2 is lifted and the paper 30 is sandwiched between the printing drum 1 (see FIG. 5). ). At this timing, the registration roller 25 does not loosen the sheet 30 yet.
The sheet 30 is in the most stable state and does not flutter, and the light-emitting element 27 and the light-receiving element 28 detect the double-feeding. From the state shown in FIG. 5, the printing drum 1 and the press roller 2 are rotationally driven, respectively, and at the same time, the registration roller 25 is stopped to be driven. The sheet 30 is ejected while being printed (see FIG. 6).

The above-mentioned light receiving element 28 is a well-known double feed detecting circuit (not shown) (for example, Japanese Patent Laid-Open No. 58-212539).
It is connected via an amplifier circuit or the like. In this double feed detection circuit, the amount of transmitted light detected when a sheet passes between the light emitting element 27 and the light receiving element 28 is compared between a certain sheet and the sheet to be sent next to determine whether or not there is a double feed. To be detected. It is of course possible to stop printing by outputting a detection signal from the double feed detection circuit,
It is also possible to operate a post-processing device such as a sorter or a tape sorter as described later and 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 the switch off.

In the apparatus of this embodiment, the output end of the double feed detection circuit is taken out as an external terminal, and when a post-processing device such as a sorter or a tape sorter is additionally used, these post-processing devices are used. It is possible to output a double feed detection signal. When a double feed of paper is detected, the double feed detection circuit outputs a detection signal to these post-processing devices.In the case of a sorter, the double fed paper is discharged to another shelf, and in the case of a tape sorter. Tape is sandwiched between the sheets of paper that have been double fed. Then, even if the double feeding of the sheets is detected, the printing itself is not stopped, and the printing is continued until the printing of the initially set number of sheets is completed. Therefore, when the sorter is connected, it is sufficient to remove the blank paper from the paper discharged to the separate shelf, and when the tape sorter is connected, the blank paper can be removed from the place where the tape is sandwiched. . In this way, even if there is double feeding of paper, printing is continued to the end without being stopped halfway, and it is easy to remove blank paper after printing is completed.

[Brief description of 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 example of a stencil printing machine according to the present invention,
It is a figure which shows a series of operating states of a paper feeding unit.

FIG. 3 shows an example of a stencil printing machine according to the present invention.
It is a figure which shows a series of operating states of a paper feeding unit.

FIG. 4 shows an example of a stencil printing machine according to the present invention,
It is a figure which shows a series of operating states of a paper feeding unit.

FIG. 5 shows an example of a stencil printing machine according to the present invention.
It is a figure which shows a series of operating states of a paper feeding unit.

FIG. 6 shows an example of a stencil printing machine according to the present invention.
It is a figure which shows a series of operating states of a paper feeding unit.

[Explanation of symbols]

1 Printing Drum 2 Press Roller 3 CCD Sensor 4 Lens 5 Fluorescent Lamp 6 Mirror 7 Document Holding Plate 8 Master Roll Paper 9 Thermal Head 10 Platen Roller 11 Cutter 12 Sponge Roller 13 Core 14 Jump Table 15 Paper Retaining Guide 16 Master Clamp 17 Paper Peeling claw 21 Paper feed plate 22 Paper feed roller 23 Guide plate 24 Separation plate 25 Registration roller 26 Guide 27 Light emitting element 28 Light receiving element 30 Paper

Claims (7)

[Claims] 1. A stencil printing machine having a paper feed mechanism section for supplying print paper between a print drum and a press roller, wherein the paper feed mechanism section detects a state in which print paper is supplied in an overlapping manner. A stencil printing machine comprising a feed detecting means. 2. The stencil printing machine according to claim 1, wherein said paper feed mechanism section stops the supply of said printing paper when said double feed detection means outputs a double feed detection signal. 3. In a stencil printing machine having a paper feed mechanism portion for feeding print paper between a print drum and a press roller, the paper feed mechanism portion detects a state in which print paper is fed in an overlapping state. A multi-feed detection means, which outputs a multi-feed detection signal for operating the post-processing means while permitting continuation of printing, and the post-processing means receives the multi-feed detection signal. ,
A stencil printing machine, characterized in that the printing paper supplied in the overlapping manner is distinguished from other printing papers. 4. In a stencil printing machine having a paper feed mechanism portion for feeding print paper between a print drum and a press roller, the paper feed mechanism portion detects a state in which print paper is fed in an overlapping state. A stencil printing machine comprising: a feeding detection means and an output end for outputting an output signal of the double feeding detection means to an external device. 5. In a stencil printing machine having a paper feed mechanism portion for feeding print paper between a print drum and a press roller, the paper feed mechanism portion detects a state in which print paper is fed in an overlapping state. A stencil printing machine comprising a feeding detection means, wherein the feeding detection means outputs a feeding detection signal to an external device. 6. A stencil printing machine having a paper feed mechanism section for feeding print paper between a print drum and a press roller, wherein the paper feed mechanism section detects the overlapped and fed state of the print paper. A stencil printing machine comprising feed detection means and switch means for selectively switching the operating state and the non-operating state of the multi-feed detecting means. 7. A stencil printing machine having a paper feed mechanism portion for feeding print paper between a print drum and a press roller, wherein the paper feed mechanism portion detects an overlapped and fed state of print paper. The double feed detecting means includes a light emitting element and a light receiving element which are provided at a position crossing a passage through which the printing paper is supplied. A stencil printing machine, characterized in that the amount of transmitted light of the printing paper is measured when passing through the path in a received state.