JPH11147631A - Paper position detecting sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for a paper detecting sensor whereby a detection position can be changed, further with vertically opening made possible. SOLUTION: A structure has an upper/lower frames 10, 20 movably holding a paper position detecting sensor, shafts 12, 22 held to the frames 10, 20 to have a screw part, sensor holders 13, 23 holding sensor base boards 16, 26 provided movably by rotating the shaft 12, 22, a knob journalling the upper/lower frames 10, 20 able to turn to have a rotary tab in at least one side, a screw gear 31 fixed to this knob, and screw gears 11, 21 respectively mounted in the shafts 12, 22 held to the upper/lower frames 10, 20 to be meshed in a direction orthogonal to the screw gear 31. By turning the knob, the respective sensor holders 13, 23 mounted in the upper/lower frames 10, 20 is synchronously moved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a paper detection sensor of a printer.

[0002]

2. Description of the Related Art A printer for printing a barcode on a label sheet is provided with a sensor for detecting the position of the label sheet. This paper detection sensor is provided on the paper path and has a transmission type sensor or a reflection type sensor, which detects the backing of the label paper or the black line or notch provided on the backing paper and detects the label paper. The position is being detected. There is also a slide-type sensor having a structure in which the sensor is movable and can be set in accordance with the notch of the recording paper. The slide-type sensor is provided with sensors at opposite positions above and below a U-shaped frame, and can be moved in a direction perpendicular to the recording paper conveyance direction.

[0003]

A sensor is provided on the passage of the recording paper. However, the distance detectable by the sensor is as small as a few millimeters.
The recording paper must be passed between the sensors, and the operation becomes complicated. There is also a problem that the label paper comes off and sticks to the sensor. An object of the present invention relates to a structure of a paper detection sensor in a thermal printer, and provides a structure of a paper detection sensor capable of changing a detection position and opening the sensor up and down.

[0004]

In order to achieve the above object, the present invention relates to a paper position detecting sensor, comprising upper and lower frames for movably holding the paper position detecting sensor, and a screw portion held by the frame. A shaft having a sensor holder for holding a sensor substrate movably provided by rotating the shaft,
A knob rotatably supporting the upper and lower frames and having a rotary knob on at least one side; a screw gear fixed to the knob; and a shaft attached to each of the shafts held by the upper and lower frames and orthogonal to the screw gear. And a screw gear meshed in the same direction, and by turning the knob, the respective sensor holders attached to the upper and lower frames are moved synchronously.

[0005]

An embodiment of the present invention will be described with reference to the drawings. In the sheet detection sensor shown in FIGS. 1 and 2, the upper and lower sensor frames 10 and 20 are rotatably supported by a shaft 30 having a screw gear 31. A spiral shaft 12 is axially supported by the sensor frame 10 by two support portions cut and raised from the sensor frame 10. 1
1 is attached, and the other end is rotatably fixed to the sensor frame 10 with an E-tome.

The screw gear 11 and the spiral shaft 12 are fixed so that the spiral shaft 12 rotates in synchronization with the rotation of the screw gear 11. A screw portion is formed on the spiral shaft 12, and the sensor holder 13 is movably supported along the screw. The sensor holder 13 is provided with holes through which spiral shafts are provided on both sides and a sensor window on the lower surface, and a sensor substrate 16 is attached. A transmission type photo sensor and a reflection type photo sensor are arranged on this sensor substrate. A leaf spring 14 for engaging with the screw portion of the spiral shaft 12 and moving the sensor holder 13 in accordance with the rotation of the spiral shaft 12 includes a screw 15
Is attached to the sensor holder 13. The sensor holder 13 moves along the sensor frame 10 according to the rotation of the spiral shaft 12.

The sensor frame 20 has the same structure as the sensor frame 10 and has a spiral shaft 2.
2, screw gear 11, sensor holder 23, sensor board 26, leaf spring 14, and screw 15 are attached. The spiral shaft 22 has the same pitch as the spiral shaft 11 and is provided with a thread portion in the opposite direction. A transmission type photosensor is arranged on the sensor substrate 26.
The transmission type photo sensor and the transmission type photo sensor arranged on the sensor substrate 16 are aligned with each other.
The position of the sensor holder 23 is adjusted and incorporated.

The sensor frame 10 is provided with a projection 17 for positioning with the sensor frame 20 and a lever 18 for fixing, and is provided on the sensor frame 20 when the sensor frame is in a closed recording state. The positioning holes (not shown) are fitted to the pins 28, respectively, so as to maintain the detection distance of the sensor.

A knob 32 for rotating the screw gear 31 to move the sensor holder is formed on one of the shafts 30 of the screw gear 31. When the knob 32 is rotated, the screw gear 31 also rotates synchronously, and the screw gears 11 and 21 rotate in a direction perpendicular to the screw gear 31. Screw gear 1
1 and 21 are respectively connected to spiral shafts 12 and 22, and the respective spiral shafts also rotate. The rotation of the spiral shafts 12, 22 moves the sensor holders 13, 23 while maintaining the same position, and can change the detection position of the sensor in the width direction of the sheet.

The sensor frames 10 and 20 can be opened and closed around the screw gear shaft 30 as shown in FIGS. At this time, the screw gear 1 cooperates with the screw gear 31.
Since 1, 12 also rotate, the sensor frames 10, 20
1 can be operated to operate the knob 32 to move the sensor holders 13 and 23 in the width direction of the sheet.

[0011]

According to the structure of the present invention, it is not necessary to pass the paper between the narrow sensors, so that the workability is improved. You can also adjust the sensor position with the sensor open, so if you want to align the sensor with the notch on the paper, after loading the paper, turn the knob and adjust the position with the notch while looking at the lower sensor. The sensor position can be easily adjusted. Even if the label paper comes off and sticks to the sensor, it can be easily removed because the sensor can be opened.

[Brief description of the drawings]

FIG. 1 is a perspective view of a state in which a sheet detection sensor of the present invention is opened.

FIG. 2 is a perspective view of the paper detection sensor of the present invention in a use state.

[Explanation of symbols]

 10, 20 Sensor frame 11, 21, 31 Screw gear 12, 22 Spiral shaft 13, 23 Sensor holder 16, 26 Sensor board 30 Axis 32 Knob

Claims (1)

[Claims] 1. A paper position detection sensor, comprising: upper and lower frames for movably holding a paper position detection sensor; a shaft held by the frame and having a screw portion; and a movably provided by rotating the shaft. A sensor holder for holding the sensor substrate
A knob rotatably supporting the upper and lower frames and having a rotary knob on at least one side; a screw gear fixed to the knob; and a shaft attached to each of the shafts held by the upper and lower frames and orthogonal to the screw gear. And a screw gear meshed in different directions, and by turning the knob, the respective sensor holders attached to the upper and lower frames are moved synchronously.