JPH0627154U - Serial impact dot printer - Google Patents

Abstract

(57) [Summary] [Purpose] In a serial impact dot printer,
Without causing perforation or tear in the multi-part paper P,
Make clear prints. A pair of print heads provided with a plurality of print wires 2 that move forward and backward are arranged so that the print wires face each other with the front and back surfaces of a multi-part paper P sandwiched therebetween. While moving the pair of print heads synchronously along the multi-part paper P,
A drive means is provided for causing the print wires 2, 2 in both print heads to operate in synchronism. The cushioning film materials 20 and 21 are arranged between the printing wires 2 and 2 facing each other and the outermost front and back surfaces of the multi-part paper P.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a serial impact dot printer.

[0002]

[Prior art]

 As is well known in the art, serial impact dot printers have an ink ribbon arranged on the front side of the paper placed on the front surface of the platen, and the print wire should protrude from the print head toward the surface of this ink ribbon. By the impact force of the printing wire, the ink in the dot portion is pressed against the surface of the paper to print predetermined characters, etc. When printing on a stack of multiple sheets of paper at once, the second and subsequent sheets of paper are printed. So-called multi-part paper is used.

Meanwhile, the multi-part paper has a drawback that the dot pressure of the printing wire on the paper near the platen surface becomes weak and the printing becomes unclear. In order to eliminate this drawback, in Japanese Patent Laid-Open No. 54-138725, a pair of print heads are arranged so that the print wires face each other so as to sandwich the front and back surfaces of multi-part paper. A serial impact dot printer has been proposed which includes a drive means for moving the print heads synchronously along the print sheet and for causing the print wires in both print heads to operate in synchronization.

[0004]

[Problems to be solved by the device]

 However, in this prior art, the ink ribbon is arranged on one surface side of the multi-part paper. Therefore, since the tip of the printing wire collides with the surface of the paper through the ink ribbon, the impact force is alleviated by the ink ribbon to some extent, and the uppermost paper of the multi-part paper located on the back surface is the printing wire. The linear breakage does not occur in the paper as in the case of perforation or ruled line printing, but for the backmost paper on the side where the ink ribbon is not placed, the print wire is directly attached to the back of the paper. Since they will collide with each other, there has been a problem that the above-mentioned perforation and paper breakage occur.

The present invention aims to solve this problem.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention arranges a pair of print heads having a plurality of print wires that move back and forth so that the print wires face each other with the front and back surfaces of the print paper sandwiched therebetween. In a serial impact dot printer that has a pair of print heads that move in synchronism with the print paper and drive the print wires in both print heads in synchronization, In addition, a cushioning film material is arranged on the outermost front and back sides of the printing paper.

[0007]

[Operation and effect of the device]

 With the configuration described above, during the printing operation, the print wires protruding from the pair of print heads facing each other are respectively placed on the outermost surface side and the lowermost surface side of the sheets stacked with the buffer film material. Since they collide like a pinch, the impact force is reduced compared to when they collide directly with the paper, and the outermost paper does not have holes or tears, but the printing on all the above-mentioned paper is clear. Therefore, the printing quality is improved.

[0008]

【Example】

 Next, an embodiment embodying the present invention will be described. FIG. 1 is a plan view showing a main part of a serial impact dot printer according to the present invention, in which a print head 1 is sandwiched between the front and back sides of a so-called multi-part paper P which is formed by stacking 7 to 9 pressure sensitive papers. Place 1 facing each other. Each print head 1 in this embodiment is provided with a plurality of print wires 2 (see FIG. 2 and FIG. 3), although the main part is not shown, and piezoelectric ceramics are laminated in a laminated manner corresponding to each print wire 2. The piezoelectric element is used as a drive source, and when a voltage is applied to this piezoelectric element, it expands and contracts in the stacking direction of the piezoelectric ceramics. Then, the tip of each print wire 2 is configured to protrude from the nose portion 1a of the print head 1, but an electromagnetic solenoid may be used as a drive source of the print wire.

The carriage 3 on which each of the print heads 1 is mounted is slidably fitted on a guide main shaft 5 mounted on a frame 4 of the printer, and an auxiliary shaft 6 arranged in parallel with the guide main shaft 5. Is slidably inserted into a rearwardly open guide groove of the rear end of the carriage 3. A timing belt 7 is arranged between the guide main shaft 5 and the auxiliary shaft 6 corresponding to each print head 1, and one position of each timing belt 7 is fixed to the lower surface of each carriage 3 or the like, while the drive shaft is driven. 8 and the pulleys 10, 11, 10 and 11 attached to the driven shaft 9 around the timing belts 7 and 7, and the drive shaft 8 is rotated by the control motor 12 such as a step motor capable of rotating in the forward and reverse directions. The pair of carriages 3 and 3 and the pair of print heads 1 and 1 are configured to move to the right and left in synchronization.

The multi-part paper P has perforations formed at regular intervals on both left and right sides thereof, and the multi-part paper P is conveyed by the pin tractor unit 13 located on the downstream side of conveyance. Reference numeral 14 is a guide roller on the upstream side of the conveyance, and reference numerals 15 and 16 are guide plates arranged along the conveyance path. In order to move the pair of print heads 1 and 1 to the left and right in synchronization and to operate the print wires 2 and 2 of both print heads 1 and 1 in synchronization, a control device such as a host computer or word processor is used. The print data and the drive command control signal transmitted from the printer are transmitted to the drive means of both print heads 1 and 1 via the central processing unit (CPU) 17 and the print drive circuit 18 of the electronic control device, while driving the carriage. It is transmitted to the control motor 12 via the circuit 19 (see FIG. 1).

In the present invention, the cushioning film material 20 is sandwiched between the front and back surfaces of the multi-part paper P at a position facing the nose portions 1a, 1a of the print heads 1, 1 facing each other. 21 is arranged. In this case, in this embodiment, the buffer film material 20 on one side (position facing the surface of the paper at the outermost surface position of the multi-part paper P) is an ink ribbon as in the conventional case, and the other (the position of the multi-part paper P on the multi-part paper P). As the buffer film material 21 at a position facing the back surface of the paper at the most back surface position, a carbonless ribbon made of a polyimide film or a polyester film is used. Further, in this case, it is preferable that the carbonless carbon dioxide buffer film material 21 is impregnated with an oil component.

The both buffer film materials 20 and 21 are configured to be wound and moved according to a printing operation by a conventionally known mechanism. When the multi-part paper P is composed entirely of pressure-sensitive paper, the one buffer film material 20 may also be a carbonless ribbon. With this configuration, the print heads 1 and 1 facing each other with the cushioning film materials 20 and 21 on the front and back sides sandwiched therebetween in accordance with the print command are oriented in the direction orthogonal to the feeding direction of the multi-part sheet P. By moving the printing wires 2 and 2 in synchronism while moving them in the horizontal direction in synchronization, predetermined characters or the like can be printed on the multi-part paper P. When the printing operation for one line is completed, the multi-part paper P is vertically fed by one line, and the printing operation is repeated.

During such a printing operation, the print wires 2 and 2 projecting from the pair of print heads 1 and 1 facing each other are respectively provided on the outermost surface side of the multi-part paper P through the buffer film materials 20 and 21. Since they collide with the outermost sheet and the backside of the sheet, the impact force is mitigated compared to when they collide directly with the sheet, and the outermost sheet is not punctured or torn, but many The printing on all of the parts paper P is clear, and the printing quality is improved.

In the above case, when the buffer film materials 20 and 21 are impregnated with an oil component (in the case of an ink ribbon, a mixture of carbon and oil (kneaded) is generally attached to the film material), If the tip of the printing wire 2 collides with the cushioning film material, oil adheres to the outer periphery of the tip, so that when the printing wire 2 retreats to the nose portion 1a, the sliding guide surface of the nose portion with the printing wire will slide. It is possible to prevent the abrasion of the printing wire 2 due to the slipping of the oil because the oil can enter.

[Brief description of drawings]

FIG. 1 is a plan view of a printer of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is an enlarged side view of a main part.

[Explanation of symbols]

 1,1 Print head 1a, 1a Nose part 2,2 Print wire 3,3 Carriage 7,7 Timing belt 20,21 Buffer film material P Multi-part paper

Claims (1)

[Scope of utility model registration request] 1. A pair of print heads provided with a plurality of print wires that move forward and backward are arranged so that the respective print wires face each other with the front and back surfaces of a print sheet sandwiched therebetween, and the pair of print heads are While moving synchronously along the print paper,
In a serial impact dot printer provided with a drive means for causing the print wires in both print heads to operate in synchronization with each other, a cushioning film material is arranged on the outermost front and back sides of the plurality of the above-mentioned print sheets. A serial impact dot printer featuring.