JPH057456U - Printer - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of this paper is to improve the maintainability and assembly of the structure of the paper feeding section of the printer. A printing unit, two sets of four tractors provided above and below the printing unit for feeding a total of four, first and second support frames for respectively supporting the tractors, and first and second support frames And a drive unit that synchronously rotates two sets of tractors in the same direction by the same amount.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a paper feeding unit of a printer. The paper feeding unit of the impact type line printer has two structures depending on the printing method.

One of them is a band type line printer in which a print band with printed characters is hung on a pulley, and a paper and an ink ribbon are sandwiched between the platen and hit with a hammer, and the other one is. This is a dot line printer that performs dot printing on the paper sandwiched between the platen and the platen by oscillating the printing section in which a large number of printing wires are arranged in the printing direction and inserting the dots through the ink ribbon.

The former is equipped with two tractors as a set above the printing unit, and the latter requires the paper to be wound around the platen, and the paper is used for printing when normal characters and enlarged characters are mixed. Since it is necessary to back-feed, four sets of four tractors are provided above and below the printing unit.

The present invention relates to the latter dot type line printer.

[0005]

[Prior Art]

 As shown in the side view of FIG. 4, the paper feeding section of the dot type printer is formed in a device rocker, and the printing section 1 itself and a mechanism section (hereinafter, shuttle mechanism section) 2 for swinging the printing section 1 are provided. It functions as a supporting base 3 and forms the frame structure of the device rocker.

Two sets of four tractors 4 are arranged above and below the printing unit 1 of the base 3, and at the same time, they rotate in the same direction by the same amount, and the sheets 32 such as continuous forms are fed in the same direction. Moving in the direction.

In the figure, 5 is an ink ribbon cassette, 6 is a shuttle motor, and 40 is an operation panel. Alternatively, as shown in the front view of FIG. 5, a shuttle mechanism section 9 in which the printing section 1, the ink cassette and the ink ribbon driving section 8 are integrated is mounted on the base frame 7, and the paper feeding section is on the base frame 7. Two sets of four tractors 4 are arranged at the upper and lower positions of the shuttle mechanism section 9, and the whole is configured as one unit.

[0008]

[Problems to be solved by the device]

 In the above configuration, in the case of FIG. 4, the base needs to have sufficient strength to support the relatively heavy printing portion and the shuttle portion, resulting in an increase in size.

[0009] Therefore, there is a problem in that the size of the entire apparatus becomes large in spite of the market demand for downsizing, and the printing section and the shuttle section need to be removed for maintenance, which is a difficult task. It was

On the other hand, in the case of FIG. 5, the paper feeding unit is unitized, but since the tractor is arranged so as to sandwich the printing unit, the base frame becomes long and heavy, and it is difficult to remove the unit. There was a problem that installation workability was poor and maintainability was poor.

[0011]

[Means for Solving the Problems]

 In the present invention, as shown in the perspective view of FIG. 1, a printing unit 1, two sets of four tractors 4 for paper feeding provided above and below the printing unit 1, and a tractor 4 for supporting the tractor 4, respectively. The first and second support frames 10 and 11, the fixing member 12 that positions and fixes the first and second support frames 10 and 11 to each other, and the two sets of tractors 4 are synchronized in the same direction in the same amount. It is composed of a drive unit 13 for rotating.

[0012]

[Action]

 The support frame of the tractor is divided into two parts up and down with the printing part as the boundary, and the unit to be handled is small and lightweight, making it easy to handle.

[0013]

【Example】

 In the present invention, as shown in the perspective view of FIG. 1, a printing unit 1, two sets of four tractors 4 for paper feeding provided above and below the printing unit 1, and a tractor 4 for supporting the tractor 4, respectively. The first and second support frames 10 and 11, the fixing member 12 that positions and fixes the first and second support frames 10 and 11 to each other, and the two sets of tractors 4 are synchronized in the same direction in the same amount. It is composed of a drive unit 13 for rotating.

That is, the support frame serving as the base of the paper feeding unit is composed of first and second support frames 10 and 11 which are vertically divided into two with the printing unit 1 as a boundary. The outer width W ₁ of the first support frame 10 is smaller than the inner width W _{2 of} the second support frame 11, and is inserted into the second support frame 11 from above.

As shown in the same drawing and a partially enlarged view of FIG. 2, the fixing member 12 serves to position the second support frame 11 and the inserted first support frame 10 in order to position the first support frame 10 Recesses 14 provided at a plurality of lower end portions of the pin, pins 15 projecting from the second support frame 11 engaging with the recesses 14, and first and second pins 15 fixedly engaged. The first and second support frames 10 and 11 that are integrated with the screws 16 that fix the support frames 10 and 11 of the device are fixed to the recesses of the base plate 17 of the device rocker. The fixing pin 18 protruding from the support frame 11 is constituted by a fixing metal fitting 19 and a screw 20 for pressing and fixing the fixing pin 18 as shown in a partially enlarged view of FIG.

The driving unit 13 for synchronously rotating the two sets of tractors 4 in the same direction in the same amount rotates the stepping motor 21 provided in the first support frame 10 and the upper tractor 4 as shown in FIG. A first timing pulley 22, a second timing pulley 24 that rotates the platen 23, a timing belt 25 that connects them, and a first gear 26 that is coaxial with the second timing pulley 24. On the other hand, the second support frame 11 has a second gear 27 that meshes with the first gear 26, a third gear 28 that meshes with the second gear 27, and a third gear 28 that is coaxial with the third gear 28. A timing pulley 29, a fourth timing pulley 30 that rotates the lower tractor 4, and a timing belt 31 that connects the third timing pulley 29 and the fourth timing pulley 30.

Therefore, when the first support frame 10 and the second support frame 11 are connected, the first gear 26 meshes with the second gear 27, and the two upper and lower sets of the tractor 4 and the platen 23 move in the same direction. By rotating the same amount synchronously, a sheet such as a continuous form is transferred in a predetermined direction (for example, upward).

In this way, the support frame of the paper feeding unit is divided into two parts vertically with the printing unit 1 as a boundary. Therefore, the unit for handling the work at the time of assembling and dismounting is downsized and the work is facilitated. Therefore, maintainability and assembly are improved.

[0019]

[Effect of the device]

 According to the present invention, the handling unit of the paper feeding unit of the printer is reduced in size and weight, and the maintainability and the assemblability are improved, which is a great economic and industrial effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a paper feeding unit of the printer of the present invention,

FIG. 2 is a partially enlarged view of a fixing member,

FIG. 3 is a partially enlarged view of another fixing member,

FIG. 4 is a side view of a paper feeding unit of a conventional printer,

FIG. 5 is a front view of a paper feeding unit of another conventional printer,

[Explanation of symbols]

1 printing part, 4 tractor, 10 1st support frame, 11 2nd
Support frame, 12 fixing member, 13 drive part, 14 recess,
15 pins, 16, 20 screws, 17 base plate, 18 fixing pins, 19 fixing brackets, 21 stepping motor, 22 first timing pulley, 23 platen, 24
2nd timing pulley, 25, 31 timing belt, 26 1st gear, 27 2nd gear,
28 3rd gear, 29 3rd timing pulley, 30 4th timing pulley,

Claims (1)

[Claims for utility model registration] 1. A printing unit (1), two sets of four tractors (4) for paper feeding provided above and below the printing unit (1), and the tractor (1) 4) First and second support frames (1
0, 11), a fixing member (12) for positioning and fixing the first and second support frames (10, 11) to each other, and the two sets of tractors (4) in the same direction in synchronization with each other. A printer comprising a drive unit (13) for rotating the same amount.