JPH01242274A - Paper jamming/oblique running detection mechanism of printing apparatus - Google Patents

Abstract

PURPOSE:To immediately stop and repair printing operation, by detecting the presence of sprocket holes and the shift between the sprocket holes on both sides by a transmission type sensor during the feed of paper to detect the jamming and oblique running of the paper. CONSTITUTION:The continuous paper 14 taken out of a paper receiving part 13 and engaged with tractor mechanism parts 7, 8 is sent at a constant speed in a printing direction by the driving of the tractor mechanism parts 7, 8. At this time, the lights from transmission type sensors 11, 12 transmit through the left and right sprocket holes 15, 16 of the paper 14 and, when the sprocket holes 15, 16 do not pass the positions of the transmission type sensors 11, 12 within a definite time, it is judged that the jamming of the paper is generated and a drive motor 9 is stopped to stop the feed of the paper 4. The positional shift between the left and right sprocket holes 15, 16 of the paper 14 is detected by one transmission sensor 11 and the other transmission sensor 12 and, when there is a positional shift, the oblique running of the paper is judged and the drive motor 9 is stopped to perform inspection and repairing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a continuous paper printing device having sprocket holes on both sides thereof, and more particularly to a mechanism for detecting jams and skew during paper feeding.

(Prior art) This type of printing device is equipped with a pair of tractor mechanisms having sprockets in front of the print head, that is, on the paper feeding side, and uses the teeth of the sprockets to feed the sprocket holes on both sides of the continuous paper. However, conventional printing devices of this type do not have a mechanism to detect paper jams or skewed feeding, and paper jams may occur for some reason after it passes through the tractor mechanism. The structure is such that the paper continues to feed even if the paper is bent or becomes skewed, and in reality, jams can only be visually detected after a large number of jams have occurred.

(Problems to be Solved by the Invention) As mentioned above, conventional printing devices that use continuous paper with sprocket holes do not detect jams or skewed feeding of the paper, so paper jams or skewed feeding may occur. However, since the paper continues to be fed even after printing, a large number of paper jams occur, which requires a lot of effort and time to repair.Also, the paper is printed in a slanted manner, resulting in slanted rows or columns. There was a problem that I noticed for the first time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a continuous paper jam and skew detection mechanism with a sprocket hole that can detect paper jam or skew during paper feeding, and can immediately stop or repair the printing operation.

(Means for Solving the Problems) The paper jam/skew detection mechanism according to the present invention includes a pair of transmission type sensors arranged opposite to the left and right sprocket holes of continuous paper with sprocket holes. , a paper jam is determined by detecting the passage of the sprocket holes, and a paper skew is determined by detecting the positional deviation of the left and right sprocket holes.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic perspective view showing a printing device having a paper jam/skew detection mechanism according to an embodiment of the present invention while paper is being fed. A printing unit consisting of a print head 1 and a platen 2 is provided at the top of the printing device, and below the printing unit, a front guide plate 3 and a back guide plate 4 extending to the print unit are separated from each other to form left and right side plates 5.6. is fixed. A continuous sheet of paper 14 having sprocket holes 15, 16 on both sides is fed to the printing section without resistance passing between these guide plates 3, 4. Further below both guide plates 3, 4, a pair of tractor mechanisms 7.8 having sprockets are provided so as to engage with sprocket holes 15.16 on the left and right sides of the sheet 14. In the tractor mechanism section, a sprocket is rotationally driven by a drive motor 9 via a belt 10, and the sprocket teeth drive out a sprocket hole in a sheet of paper 14, and the continuous sheet of paper 14 stored in a paper storage box 13 below is drawn in. to send it upward. - pairs of transmission type sensors 11 and 12 are provided inside the left and right side plates 5.6 so as to correspond to the positions of the left and right sprocket holes of the paper 14. The transmission type sensors 11 and 12 are composed of, for example, photoelectric detectors, and their detection light passes through the sprocket hole, thereby detecting the passage of the sprocket hole and the deviation of the left and right hole positions.

In the embodiment shown in FIG. 1, the continuous paper 14 taken out from the paper storage section 13 and attached to the tractor mechanism sections 7 and 8 is sent toward the printing section at a constant speed by the drive of the tractor mechanism sections. At this time, the transmission type sensors 11 and 12
If the sprocket holes do not pass through the transmission type sensors 11 and 12 within a certain period of time, it is determined that a paper jam has occurred,
The drive motor 9 is stopped to stop feeding the paper. In addition, the transmission type sensor 11 on one side and the transmission type sensor 12 on the other side detect the positional deviation of the left and right sprocket holes of the paper 14, and if there is any deviation, it is determined that the feeding is skewed, the drive motor 9 is stopped, and the inspection is carried out. Perform repairs.

(Effects of the Invention) As explained above, the present invention provides a printing device that prints on continuous paper with sprocket holes, in which a pair of transmission type sensors are provided facing the left and right sprocket holes of the paper, and the By continuously detecting the passage of paper through the sprocket holes and detecting the positional deviation of the left and right sprocket holes of the paper, it is possible to prevent paper jams and skewing.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a printing device having a paper jam/skew detection mechanism according to an embodiment of the present invention. 1... Print head, 2... Platen, 3.4...
Guide plate, 5.6... Side plate, 7.8... Tractor mechanism section, 9... Drive motor, 10... Belt, 11.1
2... Transmissive sensor, 13... Paper storage section, 14.
... Continuous paper with sprocket holes, 15.16... Sprocket holes. Agent Patent Attorney Toshiyoshi Somekawa

Claims (1)

[Claims] A printing device that feeds continuous paper with sprocket holes to a printing unit using sprocket teeth for printing, has a pair of transmission type sensors arranged opposite to the sprocket holes on both sides of the continuous paper, and A paper jam/skew feeding detection mechanism for a printing device, wherein the transmission type sensor detects the presence or absence of the sprocket hole and the misalignment of the sprocket holes on both sides during feeding, thereby detecting jams and skew feeding of the paper.