JPS6211876Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a recording paper end warning device for a printer.

For example, for simple register printers,
There is a device in which a roll of receipt paper or journal paper is put into a recording paper receptacle having a semicircular cross section, and the recording paper such as receipt paper or journal paper is intermittently pulled out in this state. This type of recording paper holding structure is extremely simple, but the end of the recording paper can be detected by rolling the recording paper on the surface of the recording paper receiver when the recording paper is intermittently pulled out. Therefore, there is no end warning and it is extremely inconvenient.

For this reason, as shown in Japanese Utility Model Application Publication No. 52-136704, a detector is provided which has a detection member that moves according to changes in the weight of the roll paper, and a near-end signal is generated when the weight of the roll paper decreases. There are things that have been done. However, this type of sensor lacks stability as the signal may or may not be output near the detection signal generation position.

This invention was devised in view of the above points, and it is an object of the present invention to obtain a recording paper end warning device for a printer that issues a paper end signal due to a decrease in the weight of recording paper, and whose signal generation state is stable. With the goal.

This invention provides a recording paper holder with a semicircular cross section and an opening at the top, which holds a long recording paper that is wound into a roll and is intermittently drawn out to the printing section in a rolled state. A switch lever having an arcuate surface along the bottom surface of the recording paper holder is biased upward so as to elastically connect to the lower surface of the recording paper, and is movable up and down. A switch that emits a detection signal by a deflection operation is electrically connected to the alarm, an opening is formed in a part of the recording paper holder, and a bent part that enters the opening at the tip of the arc surface of the switch lever. It is characterized by the formation of Therefore, if there is a large amount of recording paper remaining, the switch will not operate due to its weight, but as the weight of the recording paper decreases, the switch lever will rise, and eventually the bent part at the tip of the switch lever will move. A detection signal is generated when the recording paper is received. In this state, since the recording paper is received by the bent portion, it does not return, and once an end detection signal is output, the signal is continuously output, indicating a stable signal generation state.

An embodiment of this invention will be explained based on the drawings.
Reference numeral 1 denotes a recording paper holder having a semicircular cross section and an opening at the top.
This recording paper receiver 1 has bosses 2 that project downward, and printed circuit boards 3 are attached to these bosses 2. This printed circuit board 3 has a switch 4
and a buzzer 5, which is an alarm, are held while being electrically connected. The switch 4 has a switch lever 6 that functions as an actuator. The switch lever 6 passes from the back side of the recording paper receiver 1 to the front surface through an opening 1a formed in the recording paper receiver 1, and is placed along the approximate center of the length of the surface in the arc direction. The switch lever 6 is biased upward and has an arcuate surface 7 that corresponds to the arc of the bottom surface of the recording paper receiver 1, and one end of the arcuate surface 7 on the free rotation end side is attached to the recording paper receiver 1. Opening 1 formed in
A bent portion 8 facing b is formed.

In such a configuration, when the winding portion 10 of the long recording paper 9 wound into a roll is placed on the switch lever 6, the switch lever 6
is deflected downward so as to coincide with the bottom surface of the recording paper receiver 1. Therefore, the switch lever 6 allows the winding section 10 to roll each time the recording paper 9 is intermittently pulled out to the printing section 11. As the amount of the recording paper 9 to be pulled out increases, the diameter of the winding portion 10 gradually becomes smaller and the weight becomes lighter. As a result, the rolling range of the winding section 10 toward the printing section 11 is widened due to the pulling tension of the recording paper 9, and the speed at which the winding section 10 returns to the center of the recording paper receiver 1 becomes slow. As this tendency progresses, the switch lever 6 is deviated upward as shown in FIG. paper 9
To give an alarm in a stable state that a substance has disappeared or is on the verge of disappearing. Further, to replenish the recording paper 9, it is sufficient to simply throw the rolled portion 10 into the recording paper receiver 1, and the support structure for the recording paper 9 and the setting of the recording paper 9 are extremely easy.

Since this device is constructed as described above, if there is a large amount of recording paper remaining, the switch will not operate due to its weight, but as the weight of the recording paper decreases, the switch lever will rise, and eventually the switch will be activated. A detection signal can be generated when the bent part at the tip of the lever receives the recording paper. In this state, the recording paper is received by the bent part, so it does not return and a one-end detection signal is generated. The signal is continuously output, indicating a stable signal generation state.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a partially sectional side view showing a state in which recording paper is set, and FIG. 1... Recording paper holder, 1a... Opening, 4... Switch, 5... Buzzer (alarm), 6... Switch lever, 7... Arc surface, 8... Bent part, 9... Recording paper, 11...Printing section.

Claims (1)

[Scope of utility model registration request] A recording paper receptacle with a semicircular cross section and an opening at the top is provided to hold a long recording paper that is wound in a roll and is intermittently pulled out to the printing section in a loaded state so that it can roll freely. A switch lever having an arcuate surface along the bottom surface of the recording paper is biased upward so as to be resiliently joined to the bottom surface of the recording paper, and is movable up and down. A switch that emits a detection signal is electrically connected to the alarm, an opening is formed in a part of the recording paper holder, and a bent part that enters the opening is formed at the tip of the arc surface of the switch lever. A recording paper end warning device for printers featuring: