JP2616988B2 - Line thermal printer for electronic register - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line thermal printer for an electronic register which has a journal function and is selectively printed on a receipt paper and a slip by a single thermal printer. is there.

2. Description of the Related Art In recent years, line thermal printers have been developed as low-noise, high-speed printers. In this line thermal printer, a line thermal head in which a number of heating elements are arranged in an array is arranged to face a platen such as a cylinder, and printing is performed by holding a sheet between the line thermal head and the platen. is there. Such line thermal printers are used in various devices, but electronic registers require multiple types of printing, such as receipts, journals, and slips. doing. For this reason, it is difficult to reduce the size and weight of the electronic register.

As a method of solving such a problem, a method of forming a long line thermal head and a platen, and winding a receipt or a journal sheet in parallel on the platen can be considered.

Problems to be Solved by the Invention As described above, it is possible to perform printing while holding a plurality of papers arranged in parallel between a long line thermal head and a platen in parallel. However, for example, a slip or the like is printed as desired by the customer, and is not always printed like a receipt or the like. Therefore, the paths of the slip, the receipt, and the paper for each of the journals are determined independently, but since all of them cannot be always wound around one platen, the portion where the paper is not wound is the platen. Present on the outer peripheral surface. Therefore, the line thermal head is in direct contact with such a portion where the paper is not wound. That is, the above-described structure is not practical because the thermal head and the platen are significantly worn and the durability of the apparatus is low.

Means for Solving the Problems A first cylindrical platen for conveying receipt paper,
A cylindrical second platen which is supported on the same axis as the first platen and conveys the slip sheet; a first driving means; and a driving force of the first driving means, which is the first driving means. A first transmission means for selectively transmitting to the platen and the second platen, and a columnar shape which is journaled on the same axis as the first and second platens and conveys journal paper. A third platen, a second driving means, and a second driving means for transmitting a driving force of the second driving means to the third platen.
And one line thermal head that prints on the receipt paper, the slip, and the journal paper abutting on the first platen, the second platen, and the third platen, respectively. .

Action The third platen is constantly driven by the second driving means by the second transmission means to always perform printing on the journal paper, and the driving by the first driving means is performed by the first transmission means by the first transmission means. 2 is selected, and printing on receipt paper or printing on a slip is selected.
As a result, simultaneous printing on receipt paper and journal paper and simultaneous printing on slips and journal paper can be appropriately selected as required, and all printing modes required as an electronic register can be easily obtained. In addition, since the platen is stopped in the area where printing is not performed, the platen does not rotate while being in contact with the line thermal head. Can be enhanced.

Embodiment An embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a line thermal printer 1 for an electronic register is assumed, and three first-diameter cylindrical platens 2, a second platen 3, and a third platen for a slip, a receipt, and a journal are used. The platens 4 are supported on the same axis and are continuously arranged. The first to third platens 2 to 4 are swingably supported by a cam mechanism 5.
Is provided with a single line thermal head 6. In the line thermal printer 1, one stepping motor 7 is connected to the two first and second platens 2 and 3 via a driving force transmission mechanism 8 as a first driving means. . Therefore, the structure of the driving force transmission mechanism 8 will be described. First, an arm 12 is rotatably attached to a shaft 11 of a sun gear 10 connected to the stepping motor 7 via a gear 9, and a planetary gear 13 attached to a tip of the arm 12 is connected to the sun gear Meshes with 10. On the other hand, the inside of the platen shaft 14 to which the first platen 2 is fixed is hollow.
The platen shaft 15 to which the platen 3 is fixed is inserted. When the arm 12 swings, the planetary gear 13 is connected to a transmission gear 16 directly connected to the platen shaft 14 and a gear mechanism 17 to the platen shaft 15.
The first transmission means is configured so as to mesh with one of the transmission gears 18 connected via the first transmission means. In the line thermal printer 1, the third platen 4 for the journal is provided with a driving device 21 which is a second driving means also provided with a stepping motor 19 and a gear mechanism 20.
Are separately connected via a second transmission means. In the line thermal printer 1, the roll papers 22 to 24 used as receipt paper, slips, and journal paper are located at positions facing the first to third platens 2 to 4, respectively.
Are rotatably supported.

In such a configuration, in the line thermal printer 1, when the first platen 2 is rolled to issue a slip, the stepping motor 7 is rotated clockwise in FIG. Then, the sun gear 10 rotates counterclockwise, and the arm 12 attached to the shaft 11 of the sun gear 10 swings upward. Then, a planetary gear 13 attached to the tip of the arm 12 meshes with a transmission gear 16 directly connected to the first platen 2. Then, the first platen 2 is rotated by the driving force of the stepping motor 7, and printing is performed by the line thermal head 6 on the roll paper 22 for slips that are sequentially conveyed.

On the other hand, when rotating the second platen 3 to issue a receipt, the stepping motor 7 is rotated counterclockwise in FIG. 2 to mesh the planetary gear 13 with the transmission gear 18. Then, since the transmission gear 18 is connected to the second platen 3 via the gear mechanism 17, the driving force of the stepping motor 7 is transmitted to the second platen 3.

That is, in the line thermal printer 1 of the present embodiment,
By providing the first transmission means using the planetary gear 13, two platens 2 and 3 can be selectively driven by the forward and reverse rotation of one stepping motor 7, thereby achieving a reduction in size and weight of the apparatus. I have. Moreover, in the line thermal printer 1, the provision of the gear mechanism 17 and the like allows each of the first and second platens 2 and 3 to rotate in the same direction even if the stepping motor 7 rotates forward and backward. Therefore, the roll papers 22 and 23 can be easily installed, and the position of the issuing port (not shown) can be shared. In particular, since a receipt and a slip are not required at the same time, either one of the receipt and the slip can be selectively printed by a simple mechanism.

In the line thermal printer 1, when journal printing is performed, the third driving is performed by the second driving device 21.
The journal printing is normally performed at all times. Therefore, simultaneous printing on receipt paper and journal paper and simultaneous printing on a slip and journal paper can be appropriately selected as needed.

As described above, the present invention provides a cylindrical first platen for transporting receipt paper, and a cylindrical second platen that is supported on the same axis as the first platen and transports the slip paper. , A first driving means, a first transmitting means for selectively transmitting a driving force of the first driving means to the first platen and the second platen, A third platen having a columnar shape, which is journaled on the same axis as the platen and the second platen, and conveys journal paper; a second driving means; and a driving force of the second driving means, A second transmitting means for transmitting to the third platen, and one piece for printing on the receipt paper, the slip, and the journal paper which are respectively in contact with the first platen, the second platen, and the third platen. Line thermal head Then, the third platen is constantly driven by the second drive means by the second transmission means to always perform printing on the journal paper, and whether the drive by the first drive means by the first transmission means is the first platen. It is selected as the second platen to select whether to print on receipt paper or voucher, so that printing on receipt paper and journal paper at that time and simultaneous printing on voucher and journal paper can be performed if necessary. Can be appropriately selected, and all the printing modes required as an electronic register can be easily obtained,
In addition, since the platen is stopped in a portion where printing is not performed, the platen does not rotate while being in contact with the line thermal head, and wear of the line thermal head and the platen is prevented to increase durability. It has the effect of being able to do so.

[Brief description of the drawings]

1 is a perspective view of an embodiment of the present invention, FIG. 2 is an explanatory view of a driving force transmitting means, FIG. 3 is a longitudinal front view of a main part, and FIG. 4 is a perspective view of a main part. 1 ... line thermal printer, 2 ... first platen, 3 ... second platen, 4 ... third platen, 6
... Line thermal head, 8 first driving means, 21
... Second driving means

Claims (1)

(57) [Claims] A first platen for transporting receipt paper, a second platen for supporting a slip sheet supported on the same axis as the first platen, and a first platen;
Driving means, and the driving force of the first driving means
A first transmission means for selectively transmitting to the platen and the second platen, and a cylindrical shape which is journaled on the same axis as the first and second platens and conveys journal paper. A third platen, a second driving means,
A second transmitting means for transmitting the driving force of the second driving means to the third platen; and the receipt contacting the first platen, the second platen, and the third platen, respectively. A line thermal printer for an electronic register, comprising one line thermal head for printing on paper, the slip, and the journal paper.