JPH0524278A - Paper feeder in printer - Google Patents

Abstract

PURPOSE:To realize a paper feed function require for a two-sheet printer with a simple and inexpensive constitution by providing a single drive source for driving two paper feed means and a change-over means for sliding a gear train chance-over gear between the aforesaid paper feed means. CONSTITUTION:When only journal paper is fed in a direction A, a stepping motor 1 is rotated in a direction B, and a power is transmitted to a planetary gear 3a through a motor gear 1a and a reduction gear 2. At this time, a planetary lever 3 rotates in a direction C in an epicyclic manner to transmit the rotating power from the planetary gear 3a to a journal roller platen 6 through a journal transmission gear 5a and a journal paper feed gear 6a. On the other hand, only receipt paper is fed in the direction A, the aforesaid motor 1 is rotated reversely to the direction B. Lastly, the rotating power is transmitted to a receipt roller platen 7 through a receipt transmission gear 5b and a receipt paper feed gear 6b. When both the aforesaid paper are simultaneously fed in the direction A, an electric current is passed to a change-over solenoid 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is mainly applied to ECR and POS (P
oint ofsales point-of-sale control) The present invention relates to a paper feed device of a printer which is applied to a two-sheet printer incorporated in a terminal and can transfer two recording media independently or simultaneously regardless of the printing operation.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a typical example of this type of technology has two independent drive sources for two paper feeding means, and one of the recording media is independent. In this case, it is possible to select whether the transfer is to be performed or both are to be transferred at the same time by driving a drive source connected to the recording medium to be transferred.

[0003]

However, in the above-mentioned conventional technique, two expensive motors must be used as a driving source, and the number of driving transistors is required to correspond to the driving source. This is an expensive paper feeding system. The present invention has been made to solve such a drawback, and an object of the present invention is to provide a paper feeding device of a two-sheet printer having a necessary paper feeding function and an inexpensive structure.

[0004]

SUMMARY OF THE INVENTION A paper feeding device for a printer according to the present invention comprises two paper feeding means, one forward and reverse rotatable drive source for driving the paper feeding means, a drive source and a paper feeding means. A gear train for transmitting power to the means, a planetary gear between the gear train,
A switching gear slidable in the thrust direction is provided, and switching means for sliding the switching gear is provided.

[0005]

According to the above construction of the present invention, either one of the two paper feeding means is controlled by controlling the rotation direction of the drive source while the switching gear is held at the initial position without driving the switching means. Drive can be selected. Further, by driving the switching means and rotating the drive source while holding the switching gear at the slide end position, the two paper feeding means can be driven simultaneously. That is, by controlling the rotation direction of the drive source and the holding position of the switching gear, it is possible to arbitrarily select three types of paper feeding modes of the two-sheet printer, such as journal paper feeding, receipt paper feeding, or both feeding simultaneously. is there.

[0006]

1 to 4 show an embodiment of the present invention, in which (a) is a side view and (b) is a front view. This will be described with reference to FIGS. 1 to 4.

A motor gear 1a is fixed to a stepping motor 1 which is a drive source, and a large gear portion 2a of a reduction gear 2 meshes with the motor gear 1a. The reduction gear 2 has a large gear portion 2a and a small gear portion 2b integrally formed. The small gear portion 2b of the reduction gear 2 has a pair of planet gears 3
a and 3b are meshed. The planetary gears 3a and 3b are attached to the planetary gear base 3 so as to revolve the small gear portion 2b of the reduction gear 2 as a sun gear, and the planetary gears 3b and 3b are
3a is a rear stage switching gear 4 and a journal transmission gear 5a.
The gears are attached to the planetary gear bases 3 at the heights at which they mesh with. The receipt transmission gear 5b is mounted coaxially with the journal transmission gear 5a at a height that meshes with the receipt paper feed gear 6a. A receipt paper feed gear 6a and a journal paper feed gear 7a are fixed on the rotation shafts of the receipt roller platen 6 and the journal roller platen 7 as the paper feed means, respectively. In the initial state, the switching gear 4 is mounted at a height that meshes with the receipt transmission gear 5b and the planetary gear 3b. Further, a switching solenoid 8 as a switching means is engaged with the switching gear 4 via a switching lever 8a. When the switching solenoid 8 is not energized, the switching lever 8a holds the switching gear 4 in the initial position by the switching lever spring 8b. Further, the switching gear 4 is in the sliding end state, the receipt transmission gear 5b.
And has a thickness that allows the journal transmission gear 5a to be meshed. A line head (not shown) is attached to the receipt roller platen 6 and the journal roller platen 7 so as to face each other and elastically press the print target paper to sandwich the print target paper.

The operation of the present invention having the above configuration will be described. When sending only journal paper in the direction of arrow A,
In FIG. 2, by rotating the stepping motor 1 in the direction of arrow B while keeping the switching solenoid 8 in the non-energized state, power is transmitted to the planetary gear 3a via the motor gear 1a and the reduction gear 2. At this time, the planet lever 3 has an arrow C.
The planetary gear 3a revolves in the direction
Further, rotational power is transmitted to the journal roller platen 6 via the journal paper feed gear 6a meshing with the journal transmission gear 5a, and the journal paper is fed.

When only the receipt paper is fed in the direction of arrow A, in FIG. 3, the stepping motor 1 is rotated in the direction of arrow D while the switching solenoid 8 is in the non-energized state, so that the stepping motor 1 passes through the motor gear 1a and the reduction gear 2. Power is transmitted to the planetary gear 3b. At this time, the planetary lever 3 revolves in the direction of arrow E, the planetary gear 3b meshes with the switching gear 4, and further the receipt transmission gear 5b meshing with the switching gear 4 and the receipt paper feed gear 6b meshing with the receipt transmission gear 5b. The rotational power is transmitted to the receipt roller platen 7 via the sheet, and the receipt paper is sent.

When simultaneously feeding the receipt paper and the journal paper in the direction of arrow A, in FIG. 4, the switching solenoid 8 is energized to attract the iron core 8c in the direction of arrow F, and the switching gear is moved in the direction of arrow G via the switching lever 8a. The stepping motor 1 is rotated in the direction of arrow D while keeping the energized state in order to maintain the positioning state at the slide end by sliding the stepping motor 1 to the planetary gear 3b via the motor gear 1a and the reduction gear 2. Power is transmitted. At this time, the planetary lever 3 revolves in the direction of arrow E, the planetary gear 3b meshes with the switching gear 4, and the journal transmission gear 5a and the receipt transmission gear 5b meshing with the switching gear 4 respectively have a journal paper feed gear 6a, Rotational power is transmitted to the journal roller platen 6 and the receipt roller platen 7 via the receipt paper feed gear 7a, and the journal paper and the receipt paper are fed at the same time.

[0011]

As described above, according to the present invention, two paper feeding means, one drive source for driving the paper feeding means, and power transmission between the drive source and the paper feeding means. And a planetary gear and a switching gear slidable in the thrust direction are arranged between the gear trains, and the switching means slides the switching gear.

Therefore, the paper feeding function necessary for the two-sheet printer is realized while having an extremely simple and inexpensive structure.

Further, according to the above-mentioned structure of the present invention, since the gear train is arranged inside the printer and can be protected from the outside, a highly safe device in which hands and fingers are difficult to enter during operation, and similarly foreign matter such as paper pieces intrudes. It is also possible to realize a highly reliable device that is protected from

[Brief description of drawings]

FIG. 1 is a front and side view showing an embodiment of the present invention.

FIG. 2 is a front view and a side view showing an embodiment of the present invention.

FIG. 3 is a front view and a side view showing an embodiment of the present invention.

FIG. 4 is a front view and a side view showing an embodiment of the present invention.

FIG. 5 is a front view and a side view showing an example of a conventional technique.

[Explanation of symbols]

 1 Stepping Motor 2 Reduction Gear 3 Planetary Gearbox 3a, 3b Planetary Gear 4 Switching Gear 5a Journal Transmission Gear 5b Receipt Transmission Gear 6 Journal Roller Platen 6a Journal Paper Feed Gear 7 Receipt Roller Platen 7a Receipt Paper Feed Gear 8 Switching Solenoid 9 Roll Paper

Claims (1)

Claim: What is claimed is: 1. Two paper feeding means, one forward and reverse rotatable drive source for driving the paper feeding means, a drive source, the drive source and the paper feeding means. A gear train for transmitting power to, a planetary gear, and a switching gear slidable in the thrust direction are arranged between the gear trains, and a switching means for sliding the switching gear is provided. Paper feeding device for printer.