JPH0126677Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll paper near-end detection device that detects when the remaining amount of roll paper having a core in a roll insulation supply device becomes less than a certain amount.

Conventional roll paper near-end detection devices, as seen in Utility Model Application No. 52-11480 and Utility Model Application No. 53-129939, operate when the remaining amount of roll paper falls below a certain amount. Since the detection member is always in pressure contact with the side surface of the roll paper by the spring member, there is a drawback that the detection member gets caught on the roll paper when the roll paper is inserted into the feeding device. Additionally, when detecting the near end of the roll paper, the detection member is inserted into the center hole of the core, so if you try to remove the remaining roll paper when replacing the roll paper, the core may get caught on the detection member. It also had the disadvantage that it was difficult to remove.

For this reason, the conventional roll paper near-end detection device requires a component for retracting the detection member.

In order to eliminate these drawbacks, the present invention uses an elastic member as the detection member at the near end of the roll paper to facilitate the insertion and removal of the roll paper.The purpose of this invention is to reduce the number of component parts, reduce the cost, and make the roll paper easier to insert and remove. An object of the present invention is to provide a roll paper near-end detection device with good operability that does not apply a load to the paper.

1, 2, and 3 show an embodiment of the present invention, and FIG. 1 is a front sectional view of a roll paper near-end detection device. FIG. 2 is a side view of the device. FIG. 3 is a side sectional view of the device.

To explain in detail, 1 shows the state set with roll paper, and 2 shows the space 2a with the core of the roll paper.
There is. The roll paper supply frame 3 has a space capable of accommodating the roll paper, and is provided with a near-end detection device. A microswitch 4 that generates a detection signal is fixed with a screw 5. The detection lever 6 is rotatable about a shaft 7, and is pressed against the side surface of the roll paper in the direction of arrow A by the tension of a spring member 8 via a detection member 9.

The detection member 9 is composed of a coiled spring, has elasticity, and is attached to the detection lever 6 with a fastening screw 10. In this state, the detection member is in contact with the roll paper at the portion 1a, so the detection lever is tilted and the micro switch 4 is not operated and is turned off.

Next, the state in which the near end is detected as the roll paper decreases and the outer diameter becomes smaller will be explained using Figures 4 and 5. Figure 4 is a front sectional view of the operating state of the near end detection device; The figure shows a side view of the above state. As shown in the figure, when the thickness of the roll paper 1' and the core 2 becomes smaller due to the height dimension of the detection member 9 and the supply frame, the detection member 9 enters the space 2a of the core, and the detection lever 6 moves in the direction of arrow B. The micro switch 4 is turned ON and the near end of the roll paper is detected.

Next, the role of the detection member 9, which is the main purpose of the present invention, will be explained in detail using FIGS. 6 and 7. FIG. When the paper 1 is inserted, since the detection member 9 is made of a coiled spring and has elasticity, the insertion force of the rolled paper causes the detection member 9 to curve in the D direction and the detection lever to retreat in the arrow E direction. or,
FIG. 7 is an operation diagram when removing the roll paper 1'. When the detection member 9 enters the space 2a and detects the near end, when the roll paper 1' is removed in the direction of the arrow F, the detection member 9 moves in the direction of the arrow G. is bent, allowing the roll paper 1' to be replaced.

Note that it is also possible to use a soft polyurethane resin, silicone rubber, etc. as the detection member, and any member having elasticity may be used.

If the detection member is made of an elastic member as described above, it is possible to replace the roll paper with good operability without applying a large load when replacing the roll paper, and at the same time, the detection member can be retracted like in the past. The number of parts required for the roll paper is reduced, and an inexpensive roll paper near-end detection device can be provided, thus achieving the original purpose.

[Brief explanation of drawings]

1 and 2 are a front sectional view and a sectional view of a roll paper near-end detection device according to an embodiment of the present invention. Figure 3 is also a side sectional view. 4 and 5 are a front view and a side view of the operating state of the roll paper near-end detection device of the present invention. Figure 6 is an operational diagram during the insertion of roll paper. FIG. 7 is an operational diagram when removing the roll paper. 1 is a roll paper, 2 is a core of the roll paper, 3 is a supply frame, 4 is a micro switch, 6 is a detection lever, 8 is a spring member, and 9 is a detection member.

Claims (1)

[Scope of utility model registration request] In a roll paper near end detection device that detects a near end by inserting a detection member into a space of the core when the remaining amount of roll paper having a core becomes less than a certain amount, the detection member is a member having elasticity. A roll paper near-end detection device comprising: