JPH01132507U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of a label position detection device for a label printer which is an embodiment of this invention, Figs. 2 and 3 are flow diagrams showing the operation of this embodiment, and Fig. 4 is a periodic polling system. Figure 5 is an explanatory diagram showing examples of various types of label paper, their respective photoelectric conversion voltages, and the digital numbers obtained by A/D converting them. Figure 6 is the type A in Figure 5. Figure 7 is an explanatory diagram showing the operation during periodic polling when label paper is used. Figure 7 is an explanatory diagram when the label paper vibrates within the photo sensor. Figure 8 is a waveform showing the photoelectric conversion voltage when ripples occur. Figure 9 is a waveform diagram showing the photoelectric conversion voltage when jitter occurs, Figure 10 is an explanatory diagram showing the normal waveform range when voltage information and time information are set, and Figure 11 is a waveform diagram showing the normal waveform range when voltage information and time information are set. Figure 8 is an explanatory diagram when voltage information and time information are set for the waveform, Figure 12 is an explanatory diagram when voltage information and time information are set for the waveform in Figure 9, Figures 13 and 14 are The figure is a block diagram showing a different example of a label position detection circuit of a conventional label printer. 1...Photo sensor, 1a...Light emitting element, 1b
... Light receiving element, 3 ... Detection section (photoelectric conversion means),
4... A/D converter (analog/digital conversion means), 5... Control device (CPU), 6... Storage device, 10... Label paper, 11... Mount, 12...
Label, 13...notch, 14...black mark (marking).

Claims (1)

[Claims for Utility Model Registration] 1. A label printer that prints at a predetermined position on a label removably attached to a strip-shaped mount, comprising means for transporting the label paper with the label attached to the mount in a predetermined direction; A photoelectric conversion means for applying light to the transported label paper and converting the amount of passing light or reflected light into an analog voltage; and an analog/digital conversion means for converting the analog voltage into a digital number; a portion of the label paper to which the label is attached when the range of change in the digital number output from the analog/digital conversion means as the label paper is transferred is larger than the voltage information; 1. A label position detection device comprising: a determining means for determining that a boundary between a portion of only a mount or a boundary between a detected portion such as a marking portion and another portion has been detected. 2. The label position detection device for a label printer according to claim 1, wherein predetermined voltage information and time information are stored in advance in the storage device, and the determining means is configured to detect when the digital number is longer than the time information. When the voltage changes within the range to a value larger than the above voltage information, it is determined that the boundary between the label-attached part and the backing-only part of the label paper, or the boundary between the detected part and other parts has been detected. A label position detection device characterized by being a means for detecting a label position. 3. The label position detection device for a label printer according to claim 1, wherein predetermined voltage information and time information are stored in advance in the storage device, and the determining means is configured to detect when the digital number is shorter than the time information. When the voltage changes within the range to a value larger than the above voltage information, it is determined that the boundary between the label-attached part and the backing-only part of the label paper, or the boundary between the detected part and other parts has been detected. A label position detection device characterized by being a means for detecting a label position.