TW201304966A - Paper inverting mechanism used in printers and the printer - Google Patents

Abstract

A paper inverting mechanism used in a printer is provided. At least one roller in a paper-out end of the paper inverting mechanism includes a rotary member, several balls, and a transfer roller. A cavity is defined in each two ends of the transfer roller, and the side wall of each cavity defines several grooves. The rotary member defines several vanes, and a valley is formed between each two adjacent vanes. When the rotary member is received in the cavity of the transfer roller, several receiving spaces are formed between the valleys and the cavity, and the several balls are respectively received in the several receiving spaces. When the rotary member is driven to rotate along a preset direction, the balls move under the push force of the vanes. When the balls move into the grooves, the balls are stopped by the grooves and transmit the push force to the transfer roller, thus the transfer roller moves together with the rotary member. When the rotary is stopped, the transfer roller can still rotate along the preset direction.

Description

Paper turning mechanism and printer for printer

The invention relates to a paper turning mechanism and a printer for a printer.

As shown in FIG. 1, the current printer 100 having a double-sided printing function generally includes a paper feed roller 10, a printing roller 20, a paper turning mechanism 30, a paper feed cassette 40, and an ink jet head 50. Wherein, the paper feed roller 10, the printing roller 20 and the paper turning mechanism 30 are driven by the same motor, and when the printing roller 20 is driven by the motor in the clockwise direction as shown in the figure, the turning The roller in the paper mechanism 30 is in a stationary state. When the motor reversely drives the printing roller 20 to rotate in the counterclockwise direction, the roller in the paper turning mechanism 30 is driven by the motor in the direction indicated by the arrow in FIG. Turn. When performing double-sided printing, the paper is first rotated from the paper feed cassette 40 by the paper feed roller 10 in the clockwise direction as shown in the drawing to the position where the printing roller 20 is fed, and the printing roller 20 is rotated clockwise to convey the paper. Printing is performed to the position of the inkjet head 50. When the printing of the first side of the paper is completed, the motor is reversed, and the printing roller 20 is reversely rotated in the counterclockwise direction as shown in FIG. 1, thereby feeding the paper into the paper turning mechanism 30 to turn the paper. After the paper is turned over and the front end of the paper enters the position of the printing roller 20 again, the motor is reversed again, and the printing roller 20 is driven to rotate in the clockwise direction as shown in FIG. 1 to drive the paper into the inkjet. The position of the head 50 is printed on the second side, and at this time, the rotation of the paper turning mechanism 30 is stopped.

The above printer has the following problem: when the paper is turned over, the leading end of the paper enters the position of the printing roller 20, and the tail portion of the paper remains in the paper turning mechanism 30, and the paper turning mechanism 30 The rotation is stopped so that the end of the paper is sandwiched between the roller of the paper turning mechanism 30 and its corresponding auxiliary roller 300, and the paper can only be pulled out of the paper turning mechanism 30 by the pulling force of the printing roller 20 to enter the inkjet head 50. The printing process not only leaves the indentation of the paper turning mechanism 30 during the process of pulling the paper out of the paper turning mechanism 30, but the insufficient pulling force of the printing roller 20 also causes the second surface to be printed and blurred, which affects the printing effect. .

In response to the above problems, the present invention provides a paper turning mechanism for a printer. The paper turning mechanism includes a plurality of rollers, and at least one of the paper turning mechanisms at the paper discharge end includes a transmission member, a plurality of transmission balls, and a paper feed roller. The end of the paper conveying roller is provided with a receiving cavity. The side wall of the receiving cavity is provided with a plurality of recessed receiving slots. The transmission component comprises a plurality of blades, and a recess is formed between the adjacent two blades. A plurality of receiving spaces are formed between the recessed portion and the side wall of the receiving cavity, and the plurality of transmission balls are respectively accommodated in the plurality of receiving spaces and can move in the receiving space. When the transmission member is driven to rotate in the receiving cavity in a predetermined direction, the plurality of transmission balls are moved by the plurality of blades. After the plurality of transmission balls are respectively moved to the plurality of receiving slots, the plurality of transmission balls are restricted by the plurality of receiving slots and cannot be moved, so that the plurality of transmission balls transmit the pushing of the plurality of blades to the transmission The paper roller rotates the paper feed roller together with the transmission member. After the transmission member stops rotating, the paper transfer roller can continue to rotate relative to the transmission member along the predetermined direction under the frictional force between the paper end and the paper transfer roller.

The present invention also provides a printer having the above-described paper turning mechanism.

The paper turning mechanism for the printer of the present invention eliminates the printing blur on the second side of the paper and the occurrence of the indentation of the paper turning mechanism on the paper, thereby improving the quality of the double-sided printing.

The paper turning mechanism and the printer in the printer of the present invention will be further described in detail below with reference to the accompanying drawings.

The present invention is directed to improvements in the paper turning mechanism 30 of the printer 100 shown in FIG. Fig. 2 is a schematic cross-sectional view showing a sheet turning mechanism 30a according to an embodiment of the present invention. In the present embodiment, the paper turning mechanism 30a includes a first roller 301, a second roller 302, and a third roller 303. The paper feed roller 10, the printing roller 20, and the first, second, and third rollers 301-303 of the paper turning mechanism 30a are driven by the same motor (not shown) inside the printer 100, specifically The structural relationship is described below with reference to Figures 2-4.

When the first side is printed, the motor drives the paper feed roller 10 and the printing roller 20 to rotate in a clockwise direction as indicated by the arrow in FIG. 1, and at this time, the first and second of the paper turning mechanism 30a The second roller 301-303 is stationary. When the paper is to be turned over, the printing roller 20 is rotated counterclockwise in the opposite direction of the arrow in Fig. 1 under the driving of the motor, thereby feeding the previously printed paper into the paper turning mechanism 30a. Thereafter, as shown in FIG. 2, the first roller 301 and the third roller 303 are rotated in the counterclockwise direction indicated by the arrow in FIG. 2 under the driving of the motor, and the second roller 302 is driven by the motor. Rotating in the clockwise direction indicated by the arrow in 2, the roller rotates together with its corresponding auxiliary roller (i.e., the auxiliary roller 300 shown in Fig. 1) to drive the paper to turn over. In this embodiment, one end of the first roller 301 is the paper feeding end of the printer 100, and one end of the third roller 303 is the paper discharging end of the printer 100.

Referring to FIG. 2 to FIG. 4 and FIG. 6 , the positional relationship between the first roller 301 , the second roller 302 and the third roller 303 is similar to the positional relationship between the rollers of the paper turning mechanism 30 shown in FIG. 1 . The improvement of the paper turning mechanism 30a with respect to the paper turning mechanism 30 is mainly embodied by the structures of the first roller 301, the second roller 302, and the third roller 303. In order to facilitate the clear display of the present invention, the drawings mainly illustrate the structures of the first roller 301, the second roller 302, and the third roller 303, and other related elements are omitted. In the present embodiment, the structure of the three rollers in the paper turning mechanism 30a is the same. Therefore, the roller structure in the paper turning mechanism 30a will be described below by taking only the first roller 301 as an example.

Specifically, in the present embodiment, the first roller 301 includes a transmission member 31, a plurality of transmission balls 32, and a paper feed roller 33. The transmission member 31 includes a rotating shaft 311 and a rotating wheel 312. The rotating shaft 311 is a rod-shaped structure, and the rotating wheel 312 is fixed on the rotating shaft 311 at a distance from the two ends of the rotating shaft 311. A plurality of blades 3121 are protruded from the end of the rotating wheel 312. A recessed portion 3122 is formed between each two adjacent blades 3121. The recessed portion 3122 is connected to a plane by a circular arc surface. One end of the rotating shaft 311 is connected to a transmission assembly 60, and the transmission assembly 60 drives the transmission member 31 to rotate under the driving of the motor.

As shown in FIG. 4, the paper feed roller 33 is an elongated rod-shaped structure including a rod body 331 and at least one paper feed roller 334 fixed to the rod body 331. The end of the paper transfer roller 33 is provided with a receiving cavity 332, and a plurality of recessed receiving grooves 333 are defined in the side wall of the receiving cavity 332. The receiving cavity 332 is disposed at two ends of the rod body 331. One end of the receiving groove 333 of the receiving cavity 332 forms a sharp angle with the inner surface of the receiving cavity 332, and the other end of the receiving groove 333 and the receiving cavity 332 are inside. The surface is smoothly connected. In the present embodiment, the paper feed roller 334 is made of rubber.

The rotating shaft 311 of the transmission member 31 is away from one end of the transmission assembly 60 and the rotating wheel 312 is received in the receiving cavity 332 of the paper conveying roller 33. A plurality of receiving spaces 34 are formed between the recessed portion 3122 and the side wall of the receiving cavity 332. The plurality of driving balls 32 are respectively received in the plurality of receiving spaces 34 and can be The accommodating space 34 moves. The transmission member 31 is rotatable relative to the transfer roller 33 by the driving of the motor. When the transmission member 31 is rotated in the counterclockwise direction indicated by the arrow in FIG. 2 with respect to the paper feed roller 33, the transmission ball 32 is moved by the transmission member 31, and when the plurality of transmission balls 32 are respectively moved to After the plurality of receiving slots 333, the transmission ball 32 is restricted from being moved by the receiving slot 333, that is, the driving ball 32 is caught between the transmission member 31 and the paper conveying roller 33 (see FIG. 5). Continued rotation of the transmission member 31 will drive the paper feed roller 33 to rotate together.

When the drive motor is reversed, the transmission member 31 stops rotating. At this time, if an external force in the counterclockwise direction indicated by the arrow in the figure is applied to the transfer roller 33, the transfer roller 33 acts on the external force F. The lower portion can continue to rotate in the counterclockwise direction relative to the transmission member 31.

As shown in FIG. 5, when the paper sheet is turned over, the driving member 31 of the first roller 301 is rotated by the transmission assembly 60 in the counterclockwise direction indicated by the arrow in the figure, and the blade of the transmission member 31 is rotated. 3121 pushes the transmission ball 32 to move until the transmission ball 32 enters the receiving groove 333 of the paper transfer roller 33 to be caught. At this time, the rotating wheel 312 pushes the paper-feeding roller 33 to follow the rotating wheel 312 by the driving ball 32, so that the paper-feeding roller 334 and its corresponding auxiliary roller (ie, the auxiliary roller 300 shown in FIG. 1) are jointly driven. The paper is turned over.

When the paper is turned over in the paper turning mechanism 30, the motor of the printer 100 is reversed, and the printing roller 20 is driven to rotate in the clockwise direction as indicated by the arrow in FIG. 1, the motor and the transmission. The connection between the elements 60 allows the drive assembly 60 to be driven when the motor is rotated forward, the motor being rotated relative to the drive assembly 60 without rotating the drive assembly 60, thereby causing the drive member 31 to stop rotating. The connection structure belongs to the prior art, and details are not described herein again.

The front end of the turned paper continues to move toward the inkjet head 50 by the printing roller 20, and the end of the paper is still sandwiched between the third roller 303 and its corresponding auxiliary roller (the auxiliary roller shown in FIG. 1). 300) between. The movement of the leading end of the paper toward the inkjet head 50 causes a frictional force, that is, the above-described external force F, to be generated between the end of the paper and the paper transfer roller 33. The frictional force drives the paper feed roller 33 to rotate in the counterclockwise direction indicated by the arrow in the figure with respect to the transmission member 31, so that the paper can be smoothly separated from the paper-feeding mechanism 30 by the printing roller 20, thereby eliminating When the second side of the paper is printed in the printer shown in Fig. 1, the indentation of the paper turning mechanism 30 and the blurring of the printing phenomenon occur.

In other embodiments, the third roller 303 at least one of the paper turning mechanisms 30a at the paper exit end has the above structure, and the other rollers have the same structure as the roller structure of the prior art.

It is to be understood that the above-described embodiments are merely illustrative of the invention and are not intended to limit the invention. Variations made by the person skilled in the art in the corresponding technical field in accordance with the invention are within the scope of protection of the invention.

100. . . Printer

10. . . Paper feed roller

20. . . Print wheel

30, 30a. . . Paper turning mechanism

40. . . Paper feed

50. . . Inkjet head

60. . . Transmission component

300. . . Auxiliary wheel

301. . . First wheel

302. . . Second wheel

303. . . Third wheel

31. . . Transmission Parts

32. . . Transmission ball

33. . . Transfer roller

311. . . Rotary axis

312. . . Rotating wheel

3121. . . blade

3122. . . Depression

331. . . Rod body

332. . . Containment chamber

333. . . Storage slot

334. . . Paper feed roller

34. . . Containing space

F. . . external force

Figure 1 is a schematic cross-sectional view of a printer in the prior art.

2 is a schematic cross-sectional view showing a paper turning mechanism for a printer in an embodiment of the present invention.

Figure 3 is a schematic view showing the explosion of a roller in the paper turning mechanism shown in Figure 2.

Figure 4 is a schematic view showing the explosion of a roller at another angle in the paper-turning mechanism shown in Figure 3.

Figure 5 is a schematic cross-sectional view showing the working state of the paper turning mechanism shown in Figure 2.

Figure 6 is an enlarged view of a roller in the paper turning mechanism shown in Figure 5.

30a. . . Paper turning mechanism

301. . . First wheel

302. . . Second wheel

303. . . Third wheel

31. . . Transmission Parts

32. . . Transmission ball

33. . . Transfer roller

34. . . Containing space

Claims (7)

A paper turning mechanism for a printer, the paper turning mechanism comprising a plurality of rollers, wherein the roller of the paper turning mechanism at least one of the paper feeding mechanisms comprises: a transmission member, a plurality of transmission balls and a paper conveying roller;
The end of the paper conveying roller is provided with a receiving cavity. The side wall of the receiving cavity is provided with a plurality of recessed receiving slots. The transmission component comprises a plurality of blades, and a recess is formed between the adjacent two blades. A plurality of receiving spaces are formed between the recessed portion and the side wall of the receiving cavity, and the plurality of transmission balls are respectively accommodated in the plurality of receiving spaces and can move in the receiving space when the driving member is driven When the receiving cavity rotates in a predetermined direction, the plurality of transmission balls are moved by the plurality of blades, and when the plurality of transmission balls are respectively moved to the plurality of receiving slots, the plurality of transmission balls receive the plurality of transmission balls The receiving slots are restricted from moving, so that the plurality of driving balls transmit the pushing of the plurality of blades to the paper conveying roller, so that the paper conveying roller rotates together with the transmission member; after the transmission member stops rotating, the transmission The paper roll can continue to rotate relative to the transmission member along the predetermined direction by the friction between the end of the paper and the transfer roller. The paper turning mechanism for a printer according to claim 1, wherein the transmission member comprises a rotating shaft and a rotating wheel, wherein the rotating shaft is a round rod-shaped structure, and the rotating wheel is fixed to the rotating On the shaft, the rotating wheel and one end of the rotating shaft are received in the receiving cavity of the paper conveying roller, and the other end of the rotating shaft is connected to a transmission component, and the transmission component is driven by the internal motor of the printer. The drive shaft rotates. The paper turning mechanism for a printer according to claim 2, wherein the plurality of blades are disposed at an end of the rotating wheel, and the concave portion between each two adjacent blades is formed by an arc The face is connected to a plane. The paper-feeding mechanism for a printer according to the second aspect of the invention, wherein the paper-feeding roller has a round bar shape, and includes a rod body and a plurality of paper feed rollers fixed to the rod body. The paper-feeding mechanism for a printer according to claim 1, wherein one end of the receiving groove on the paper-feeding roller forms a sharp angle with the inner surface of the receiving cavity, and the other end of the receiving groove is The inner surface of the receiving cavity is smoothly connected. A paper turning mechanism for a printer according to the invention of claim 5, wherein the paper feed roller on the paper feed roller is made of rubber. A printer comprising a paper turning mechanism as described in claims 1-6.