TWI650250B - Print media feeding mechanism having adjustable roller holders - Google Patents

Abstract

The present invention provides a printing medium feeding mechanism with an adjustable roller arm that includes a driving shaft and a pressing unit. The pressing unit includes a pressing shaft, an elastic assembly, a fixing frame, and a pair of arms. The fixing frame includes a first side wall and a second side wall. The first arm includes a first rotating shaft pivotally connected to the first side wall. One end of the first arm is connected to the elastic component, and the other end is pivotally pressed against the rotating shaft. The second arm includes an eccentric axle, an eccentric bore, and a limit shaft. The circumference of the eccentric axle and the periphery of the limit shaft are mutually pushed against each other. One end of the second arm is connected to the elastic component, and the other end is pivotally pressed against the rotating shaft. When the eccentric shaft rotates around the circumference and pushes against the periphery of the limiting shaft, the second arm is displaced along the limiting slot and is biased by the elastic component with the limiting shaft as the axis, and pushes the pressing rotating shaft to the driving rotating shaft.

Description

Print medium feed mechanism with adjustable roller arms

The present invention relates to a printing medium feeding mechanism of a printer, and more particularly to a printing medium feeding mechanism with an adjustable roller arm.

With the advancement and development of technology, the application of printers has become more and more extensive. Traditionally, such printers primarily feed paper by rotating a pair of paper feeding rollers. The fed paper clip is placed between a pair of pinch rollers disposed above the paper feed direction of the print head and a driving roller below, and a predetermined pressing force is transmitted through the rotatable pressing roller (nip pressure) ) In contact with the drive roller, the paper can be fed to the print head when the drive roller is rotated. To ensure a stable feed of the paper and to avoid skewing, the push roller and the drive roller must be parallel and maintain a smooth pressing force across the line. However, the pressing roller and the driving roller in the paper feeding mechanism often lose parallelism with each other due to improper assembly or operation. Especially in wide-format printers, since the width of the wide-format printer is long, it is usually necessary to set the composite array pressing roller relative to a common driving roller. In this case, the parallel between the pressing roller and the driving roller Partial offsets often occur. Once there is any parallel error between the pressing roller and the driving roller, in addition to excessive wear of the pressing roller and the driving roller, the feeding paper may not be fed smoothly, or even the paper may be skewed or damaged and cannot be printed.

Therefore, how to develop a printing medium feeding mechanism with an adjustable roller arm to solve the problems faced by the prior art is a problem that needs to be faced in the field.

The purpose of the present invention is to provide a printing medium feeding mechanism with an adjustable roller arm, which is suitable for a printer, such as but not limited to a wide-format printer, which can accurately and accurately implement the pressing roller and the driving roller. The parallelism between the two, and its low cost, easy maintenance, simple manufacturing, high reliability, effectively improve the problem of poor parallelism between the pressing roller and the driving roller, ensuring that the pressing roller and the driving roller are in full line contact and achieve a smooth The purpose of feeding the print media.

Another object of the present invention is to provide a print medium feed mechanism having an adjustable roller arm. By adjusting the parallelism between the pressing roller and the driving roller by connecting the roller to the double bracket, the problem of accumulating tolerances of the pressing roller and the driving roller in the printing medium feeding mechanism due to assembly can be improved, and the pressing roller and the driving roller are ensured. The parallel precision allows the pressing roller and the driving roller to maintain a smooth pressing force with each other, increasing the stability when feeding the printing medium.

To achieve the foregoing objective, the present invention provides a printing medium feed mechanism having an adjustable roller arm that includes a drive shaft and at least one pressing unit. The pressing unit is coupled to the driving shaft and cooperates with the driving shaft to feed a line of printing medium. The pressing unit includes a pressing shaft, an elastic component, a fixing frame, a first arm and a second arm. The fixing frame includes a first side wall and a second side wall. The first side wall and the second side wall are opposite to each other, and the first side wall includes a first shaft hole, and the second side wall includes a second shaft hole and a limiting groove. The first arm includes a first rotating shaft and is pivotally connected to the first shaft hole of the first side wall of the fixing frame. One end of the first arm is connected to the elastic component, and the other end is pivotally connected to the pressing shaft, and the first arm is actuated by the elastic component with the first rotating shaft as an axis, and pushes the pressing shaft to the driving shaft. The second arm comprises an eccentric axle, an eccentric wheel perforation and a limiting shaft, the eccentric axle is threaded through the eccentric perforation, and the periphery and the limit of the eccentric axle The circumference of the shaft is pushed against each other. The eccentric axle of the second arm is pivotally connected to the second shaft hole of the second side wall of the fixed frame, and the limiting shaft is disposed through the limiting slot of the second side wall of the fixed pivot frame, wherein one end of the second arm is connected to The elastic component has the other end pivotally connected to the pressing shaft. When the eccentric shaft rotates, the periphery of the eccentric shaft pushes against the periphery of the limiting shaft, so that the second arm is displaced along the limiting slot, and the second arm is actuated by the elastic component with the limiting shaft as the axis, and the pressing shaft is pushed Press the drive shaft.

1, 1a, 1b, 1c, 1d, 1e‧‧‧ feed mechanism

2‧‧‧Drive shaft

21‧‧‧ drive roller

3‧‧‧Press the shaft

31‧‧‧Press the wheel

4‧‧‧Flexible components

5‧‧‧Fixed frame

51‧‧‧First side wall

511‧‧‧First shaft hole

512‧‧‧first shaft hole

513‧‧‧ Third Axial Hole

52‧‧‧second side wall

521‧‧‧Second shaft hole

522‧‧‧Limited slot

6‧‧‧First arm

61‧‧‧First shaft

611‧‧‧ disc head

612‧‧‧ neck

613‧‧‧stops

62‧‧‧First pivot hole

63‧‧‧First auxiliary limit slot

64‧‧‧eccentric axle

641‧‧‧Adjusting the eccentric disk

642‧‧‧Axis

643‧‧‧End

65‧‧‧Eccentric wheel perforation

66‧‧‧Elastic clips

7‧‧‧second arm

71‧‧‧eccentric axle

711‧‧‧Adjust the eccentric disk

712‧‧‧Axis

713‧‧‧End

713a‧‧‧stop

72‧‧‧Eccentric wheel perforation

73‧‧‧Limited axis

731‧‧‧ disc head

732‧‧‧ neck

733‧‧‧stop end

733a‧‧‧stops

734‧‧‧Locker

74‧‧‧Second pivot hole

75‧‧‧Elastic clips

77‧‧‧Second auxiliary limit slot

8‧‧‧Auxiliary connecting rod

9‧‧‧ Press unit

AA‧‧ ‧ line segment

BB‧‧ ‧ line segment

△X‧‧‧ spacing

1 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm according to a first preferred embodiment of the present invention.

Figure 2 is a structural exploded view showing the printing medium feed mechanism of the adjustable roller arm of Figure 1.

3A and 3B are schematic views showing the arrangement relationship between the eccentric shaft and the limit shaft of the feeding mechanism of Fig. 1.

Fig. 4A is a view showing the state in which the driving shaft of the printing medium feeding mechanism and the pressing rotating shaft are not pushed in parallel.

Figure 4B is a cross-sectional view taken along line AA of Figure 4A.

Fig. 4C is a schematic view showing that the printing medium feeding mechanism adjusts the driving shaft and the pressing shaft to a parallel pushing state.

Fig. 4D is a cross-sectional view taken along line BB in Fig. 4C.

Figure 5 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm according to a second preferred embodiment of the present invention.

Figure 6 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm according to a third preferred embodiment of the present invention.

Fig. 7 is a structural exploded view showing the printing medium feeding mechanism of the adjustable roller arm of Fig. 6.

Figure 8 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm according to a fourth preferred embodiment of the present invention.

Figure 9 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm according to a fifth preferred embodiment of the present invention.

Figure 10 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm applied to a wide-format printer.

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in the various aspects of the present invention, and the description and drawings are intended to be illustrative and not limiting.

1 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm according to a first preferred embodiment of the present invention. Figure 2 is a structural exploded view showing the printing medium feed mechanism of the adjustable roller arm of Figure 1. As shown in Fig. 1 and Fig. 2, the printing medium feeding mechanism 1 (hereinafter referred to as the feeding mechanism) having the adjustable roller arm is assembled and applied to a printer, especially a wide-format printer. good. The feeding mechanism 1 of the present invention is composed of a driving shaft 2 and at least one pressing unit 9. The pressing unit 9 includes at least one pressing shaft 3, at least one elastic component 4, a fixing frame 5, a first arm 6, and a second arm 7. In this embodiment, the driving shaft 2 is a driving roller 21, and the pressing shaft 3 includes at least one pressing roller 31. When the driving roller 21 rotates to drive at least one pressing roller 31 to rotate, the pressing roller 31 and the driving roller 21 can be A print medium (not shown) is clipped, such as but not limited to paper. The fixing frame 5 includes a first side wall 51 and a second side wall 52. Wherein the first side wall 51 and the second side wall 52 are opposite to each other, and the first side wall 51 is wrapped The first shaft hole 511 includes a second shaft hole 521 and a limiting groove 522. The first shaft hole 511 of the first side wall 51 and the limiting groove 522 of the second side wall 52 are opposite to each other. The first arm 6 includes a first rotating shaft 61 and a first pivoting hole 62. The first rotating shaft 61 is pivotally disposed at a middle portion of the first arm 6 and pivotally connected to the first shaft hole 511 of the first side wall 51 of the fixing frame 5 . The first rotating shaft 61 includes a disk head portion 611, a neck portion 612, and a stopping portion 613. The neck portion 612 is disposed through the first shaft hole 511, and the disk head portion 611 and the stopping portion 613 are respectively disposed on the neck portion 612. The first end arm 6 and the first side wall 51 of the fixing frame 5 are clamped, and the first arm 6 and the first side wall 51 of the fixing frame 5 are relatively rotatable about the first rotating shaft 61 as an axis. One end of the first arm 6 is connected to the elastic component 4, and the other end of the first arm 6 is provided with a first pivot hole 62, wherein one end of the pressing shaft 3 passes through the first pivot hole 62 and the first arm 6 Pivot. When one end of the first arm 6 is lifted by the elastic pulling force of the elastic component 4, that is, with the first rotating shaft 61 as the axis, the other end of the first arm 6 drives the pressing rotating shaft 3 to push against the driving shaft 2 . On the other hand, the second arm 7 includes an eccentric axle 71, an eccentric bore 72, and a limit shaft 73. The eccentric axle 71 and the eccentric bore 72 are disposed in the middle of the second arm 7. The limiting shaft 73 is pivotally disposed in the middle of the second arm 7 and adjacent to the eccentric shaft 71 and the eccentric bore 72. The eccentric axle 71 includes an eccentric disk portion 711, a shaft portion 712, and an end portion 713. The shaft portion 712 extends through the eccentric wheel hole 72 and the second shaft hole 521 of the second side wall 52 of the fixed frame 5. In an embodiment, A portion of the outer periphery of the shaft portion 712 is coated with, for example, but not limited to, a NYLOK coated non-slip material (not shown) to pivot the eccentric shaft 71 to the second shaft hole 521 without loosening. In addition, the eccentric disk portion 711 and the end portion 713 of the eccentric shaft 71 are respectively disposed at opposite ends of the shaft portion 712, and the second arm 7 and the second side wall 52 of the fixed frame 5 are clamped. The limiting shaft 73 of the second arm 7 is similar to the first rotating shaft 61 of the first arm 6. The structure of the limiting shaft 73 also includes a disc head 731, a neck 732 and a stopping end 733. In this embodiment, the stopping end 733 further includes a stopping portion 733a. The neck portion 732 is disposed through the limiting slot 522 of the second side wall 52 of the fixing frame 5. The disc head portion 731 and the stopping end portion 733 are respectively disposed at opposite ends of the neck portion 732, and are clamped. The second arm 7 and the second side wall 52 of the fixed frame 5. Further, the peripheral edge of the eccentric disk portion 711 of the eccentric shaft 71 and the peripheral edge of the disk head portion 731 of the limit shaft 73 are mutually pushed against each other. In this embodiment, one end of the second arm 7 is connected to the elastic component 4, and the other end of the second arm 7 is provided with the second pivot hole 74, wherein the other end of the pressing shaft 3 passes through the second pivot hole. 74 is pivotally connected to the second arm 7. 3A and 3B further illustrate the arrangement relationship between the eccentric shaft and the limit shaft of the feeding mechanism of Fig. 1. The eccentric shaft 71 on the second arm 7 is rotated by adjusting the eccentric disk portion 711 with respect to the shaft portion 712 of the eccentric shaft 71, and the periphery of the eccentric disk portion 711 is pushed against the periphery of the disk head portion 731 of the limit shaft 73. The center of the shaft portion 712 of the eccentric shaft 71 can be made to have a different pitch from the center of the neck portion 732 of the limit shaft 73. In other words, since the circumference of the eccentric disk portion 711 of the eccentric shaft 71 and the circumference of the disk head portion 731 of the limiting shaft 73 are constantly pushed against each other, when the eccentric shaft 71 is adjusted to rotate, the eccentric disk of the eccentric shaft 71 is adjusted. The circumference of the portion 711 is pushed against the circumference of the disc head 731 of the limiting shaft 73, and the moment balance state of the second arm 7 is changed, so that the second arm 7 is displaced along the limiting slot 522, and at the same time, the torque is balanced. One end of the second arm 7 is lifted by the elastic tension of the elastic member 4 with the limiting shaft 73 as the axis, and the other end of the second arm 7 pushes the pressing shaft 3 to push the driving shaft 2.

4A to 4D further illustrate the operation of the printing medium feeding mechanism of the present invention with an adjustable roller arm. 4A is a schematic view showing the driving shaft and the pressing shaft of the printing medium feeding mechanism in the case of not reaching the parallel pushing state. Figure 4B is a cross-sectional view taken along line AA of Figure 4A. Fig. 4C is a schematic view showing that the printing medium feeding mechanism adjusts the driving shaft and the pressing shaft to a parallel pushing state. Fig. 4D is a cross-sectional view taken along line BB in Fig. 4C. First, as shown in FIGS. 4A and 4B, when the driving shaft 2 is displaced, the pressing roller 31 on the pressing shaft 3 cannot be completely pushed in parallel with the driving roller 21, and the partial pressing roller 31 is further driven to the driving roller. 21 spaces have a spacing of △X. In this state, the feeding mechanism 1 cannot smoothly feed the printing medium, and the printing medium is liable to be skewed or damaged. At this time, the feeding mechanism 1 of the present case can press the eccentric shaft 71 to rotate the pressing roller 3 The wheel 31 and the drive roller 21 tend to be parallel. Since the circumference of the eccentric disk portion 711 of the eccentric shaft 71 and the periphery of the disk head portion 731 of the limiting shaft 73 are constantly pushed against each other, when the eccentric shaft 71 is adjusted to rotate, the eccentric disk portion 71 is adjusted by the eccentric disk portion 711. The periphery pushes against the periphery of the disc head 731 of the limiting shaft 73, so that the second arm 7 moves along the limiting groove 522 relative to the fixed frame 5 and away from the elastic component 4, and the elastic component 4 is added to the second arm. 7 moment of the moment. At this time, the second arm 7 pivots the pressing shaft 3 pivotally connected to the second arm 7 to the driving shaft 2 with the limiting shaft 73 as the axis and corresponding to the increased torque of the elastic assembly 4. Once the pressing roller 31 on the rotating shaft 3 is pressed downward by ΔX, it is brought into contact with the driving roller 21 of the driving shaft 2 to form a parallel pushing, as shown in Figs. 4C and 4D. Therefore, the feeding mechanism 1 of the present invention can achieve the problem of improving the tolerance of the pressing roller 31 and the driving roller 21 in the feeding mechanism 1 due to assembly or long-term use, and ensuring the parallel between the pressing roller 31 and the driving roller 21. The precision is such that the pressing roller 31 and the driving roller 21 maintain a smooth pressing force with each other to increase the stability when feeding the printing medium.

On the other hand, in the present embodiment, in order to maintain the periphery of the eccentric disk portion 711 of the eccentric shaft 71 and the periphery of the disk head portion 731 of the limiting shaft 73, the eccentric shaft 71 and the limiting shaft 73 are pushed against each other. Further, a resilient clip member 75 is further disposed and disposed on the end portion 713 of the eccentric shaft 71 and the stopping end 733 of the limiting shaft 73 to assemble the periphery and the limiting shaft of the eccentric disk portion 711 of the eccentric shaft 71. The circumference of the disc head 731 of 73 is maintained. Figure 5 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm according to a second preferred embodiment of the present invention. In the present embodiment, the feeding mechanism 1a is similar to the feeding mechanism 1 shown in FIGS. 1 and 2, and the same reference numerals are given to the same elements, structures, and functions, and will not be described again. Unlike the feeding mechanism 1 shown in Figs. 1 and 2, in the present embodiment, the end portion 713 of the eccentric shaft 71 is further provided with a stopper portion 713a. The limiting shaft 73 of the second arm 7 further includes a locking member 734 disposed on the stopping end 733 of the limiting shaft 73 to adjust the pushing limit of the limiting shaft 73 to the periphery of the adjusting eccentric disk portion 711 of the eccentric shaft 71. When the periphery of the disc head 731 is at the periphery, the limiting shaft 73 can be released, so that the second arm 7 can be along the limit The slot 522 is moved relative to the fixed frame 5, and when the eccentric axle 71 is adjusted, the limiting shaft 73 is locked to the limiting slot 522 of the fixed frame 5.

Referring to FIG. 1 , FIG. 2 and FIG. 5 again, in some embodiments, the first arm 6 and the second arm 7 of the feeding mechanisms 1 and 1a respectively include a first auxiliary limiting slot 63 and a second. The auxiliary limiting slot 77, the first auxiliary limiting slot 63 and the second auxiliary limiting slot 77 are opposite to each other, and the feeding mechanisms 1 and 1a further comprise an auxiliary connecting rod 8 through the first auxiliary limiting slot 63 and the second The auxiliary limiting slot 77 is pivotally connected between the first arm 6 and the second arm 7 . Through the arrangement of the auxiliary link 8, the movement between the fixed frame 5, the first arm 6 and the second arm 7 in the paper feeding mechanisms 1 and 1a can be more stable.

Figure 6 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm according to a third preferred embodiment of the present invention. Fig. 7 is a structural exploded view showing the printing medium feeding mechanism of the adjustable roller arm of Fig. 6. In the present embodiment, the feeding mechanism 1b is similar to the feeding mechanism 1 shown in FIGS. 1 and 2, and the same component numbers denote the same elements, structures, and functions, and will not be described again. Different from the feeding mechanism 1 shown in FIG. 1 and FIG. 2, in the feeding mechanism 1b of the embodiment, the first shaft hole 512 of the first side wall 51 of the fixing frame 5 is another limiting slot, relative to the first The limiting groove 522 of the two side walls 52. In addition, the first sidewall 51 further includes a third shaft hole 513 opposite to the second shaft hole 521 of the second sidewall 52. The first arm 6 further includes an eccentric axle 64 and an eccentric bore 65. The eccentric axle 64 and the first rotating shaft 61 further comprise an elastic clamping member 66 connected to the end portion 643 of the eccentric shaft 64 and the stopping portion 613 of the first rotating shaft 61 for assembling the eccentric disk of the eccentric shaft 64. The periphery of the portion 641 is constantly pushed against the periphery of the disk head portion 611 of the first rotating shaft 61. The first eccentric axle 64 and the eccentric bore 65 of the first arm 6 are identical to the eccentric axle 71 and the eccentric bore 72 of the second arm 7. In other words, the components of the first arm 6 and the second arm 7 are mirror-symmetrical on both sides of the fixed frame 5. Therefore, when the pressing roller 31 and the driving roller 21 have a gap gap at the end of the first arm 6 and cannot be pushed completely in parallel, the eccentric shaft 64 on the first arm 6 is adjusted by rotation. The circumference of the eccentric disk portion 641 is pushed against the periphery of the disk head portion 611 of the first rotating shaft 61, so that the first arm 6 moves relative to the fixed frame 5 along the first axial hole 512 of the limiting groove structure and moves away from the fixed frame 5 The elastic component 4 increases the moment of the elastic component 4 to one end of the first arm 6. At this time, the first arm 6 pivots the pressing shaft 3 pivotally connected to the first arm 6 to the driving shaft 2 with the first rotating shaft 61 as the axis and corresponding to the increased torque of the elastic assembly 4, so as to press The roller 31 is in contact with the drive roller 21 of the drive shaft 2 and forms a parallel push. Through the adjustment mechanism of the first arm 6 and the second arm 7, the feeding mechanism 1b can more accurately and accurately achieve the parallelism between the pressing roller and the driving roller. The mirror-symmetric structure is beneficial to reduce production costs, and has the advantages of easy maintenance, simple manufacturing, and high reliability. Thereby, the feeding mechanism 1b of the present invention can effectively improve the problem of poor parallelism between the pressing roller and the driving roller, ensure that the pressing roller is in full line contact with the driving roller, and achieve the purpose of smoothly feeding the printing medium.

Figure 8 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm according to a fourth preferred embodiment of the present invention. In the present embodiment, the feeding mechanism 1c is similar to the feeding mechanism 1 shown in FIGS. 6 and 7, and the same component numbers denote the same elements, structures and functions, and will not be described again. Unlike the feeding mechanism 1b shown in Figs. 6 and 7, in the feeding mechanism 1c of the present embodiment, the auxiliary link 8 in the foregoing embodiment is further omitted. It should be emphasized that the auxiliary link 8 does not limit the conditions of the features of the present invention. This case is not limited to this, and will not be repeated. On the other hand, in the foregoing embodiment, the elastic members 4 are each composed of a set of springs, and the first arm 6 and the second arm 7 are pulled at one end. Of course, the elastic component 4 of the present invention can be implemented without being affected by this. Figure 9 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm according to a fifth preferred embodiment of the present invention. In the present embodiment, the elastic member 4 of the feeding mechanism 1d is constituted by a torsion spring. However, the composition of the elastic component 4 is not a condition limiting the features of the present invention. This case is not limited to this, and will not be repeated.

Accordingly, in the foregoing embodiment, the printing medium feeding mechanism 1 having the adjustable roller arms is assembled and applied to a printer, especially a wide-format printer. Figure 10 is a schematic view showing the structure of a printing medium feeding mechanism with an adjustable roller arm applied to a wide-format printer. As shown, in the printing medium feeding mechanism 1e of a wide-format printer, the printing medium feeding mechanism 1e includes a single driving shaft 2 and a plurality of pressing units 9, wherein the plurality of pressing units 9 are spaced apart The components are arranged to be corresponding to the driving shaft 2, wherein the components, structures and functions of the pressing unit 9 are similar to the previous embodiments, and details are not described herein. In the present embodiment, the pressing rollers 31 of each pressing unit 9 can each independently adjust the parallelism with the driving roller 21. Thereby, the printing medium feeding mechanism 1e, which is more advantageous for the wide-format printer, adjusts the optimum parallelism for the wide-format printing medium. In some embodiments, in the printing medium feeding mechanism 1e of the wide-format printer, the plurality of pressing units 9 may be the same pressing unit 9, or different pressing units 9, and may be changed according to actual application requirements.

In summary, the present invention provides a printing medium feeding mechanism with an adjustable roller arm, which is suitable for a wide-format printer, and can accurately and accurately achieve the parallelism between the pressing roller and the driving roller, and The utility model has the advantages of low cost, easy maintenance, simple manufacture and high reliability, and effectively improves the problem of poor parallelism between the pressing roller and the driving roller, ensures complete contact between the pressing roller and the driving roller, and achieves the purpose of smoothly feeding the printing medium. . By adjusting the parallelism between the pressing roller and the driving roller by connecting the roller to the double bracket, the problem of accumulating tolerances of the pressing roller and the driving roller in the printing medium feeding mechanism due to assembly can be improved, and the pressing roller and the driving roller are ensured. The parallel precision allows the pressing roller and the driving roller to maintain a smooth pressing force with each other, increasing the stability when feeding the printing medium.

This case has been modified by people who are familiar with the technology, but it is not intended to be protected by the scope of the patent application.

Claims (12)

a printing medium feeding mechanism comprising: a driving shaft; and at least one pressing unit, with respect to the driving shaft, and engaging with the driving shaft to feed a printing medium, wherein the pressing unit comprises: at least one pressing shaft; An elastic component; the at least one fixing frame includes a first sidewall and a second sidewall, wherein the first sidewall and the second sidewall are opposite to each other, and the first sidewall includes a first shaft hole, the second sidewall The first shaft includes a first shaft, and the first shaft is pivotally connected to the first shaft of the first side wall of the fixing frame, wherein the first arm One end is connected to the elastic component, the other end is pivotally connected to the pressing rotating shaft, and the first arm is actuated by the elastic component with the first rotating shaft as an axis, and the pressing rotating shaft is pressed against the driving rotating shaft; and at least one The second arm includes an eccentric shaft, an eccentric wheel perforation and a limiting shaft. The eccentric shaft is disposed through the eccentric bore, and the periphery of the eccentric shaft and the periphery of the limiting shaft are mutually pushed against each other. The eccentric shaft of the second arm is pivotally connected to the second shaft hole of the second side wall of the fixing frame, and the limiting shaft is disposed through the limiting slot of the second side wall of the fixing pivot frame. One end of the second arm is connected to the elastic component, and the other end is pivotally connected to the pressing rotating shaft, wherein when the eccentric shaft rotates, the periphery of the eccentric axle pushes against the periphery of the limiting shaft, so that the second branch The arm is displaced along the limiting slot, and the second arm is actuated by the elastic component with the limiting axis as an axis, and the pressing rotating shaft is pressed against the driving rotating shaft. The printing medium feeding mechanism of claim 1, further comprising an auxiliary connecting rod, wherein the first arm and the second arm respectively comprise a first auxiliary limiting slot and a second auxiliary The first auxiliary limiting slot and the second auxiliary limiting slot are opposite to each other, wherein the auxiliary connecting rod is pivotally connected to the first auxiliary limiting slot and the second auxiliary limiting slot Between the arm and the second arm. The printing medium feeding mechanism of claim 1, wherein the elastic component is a spring or a torsion spring. The printing medium feeding mechanism of claim 1, wherein the first rotating shaft is disposed at a middle portion of the first arm, and includes a disc head, a neck portion and a stopping portion, the neck The first shaft hole is disposed through the first shaft hole, and the disc head portion and the stopping portion are respectively disposed at opposite ends of the neck portion, and the first arm and the first side wall of the fixing frame are clamped. The printing medium feeding mechanism of claim 1, wherein the eccentric shaft is disposed at a middle portion of the second arm, and includes an adjusting eccentric disk portion, a shaft portion and an end portion, wherein the shaft portion passes through the a second shaft hole, the adjusting eccentric disk portion and the end portion are respectively disposed at opposite ends of the shaft portion, and the second arm and the second side wall of the fixing frame are clamped. The printing medium feeding mechanism of claim 5, wherein the limiting shaft is disposed at a middle portion of the second arm, and includes a disc head, a neck portion and a stopping end, the neck The limiting portion is disposed, the disc head and the stopping end are respectively disposed at opposite ends of the neck, and the second arm and the second side wall of the fixing frame are clamped, wherein the eccentricity The circumference of the adjustment eccentric disk portion of the axle and the peripheral edge of the disk head of the limit shaft are mutually urged against each other. The printing medium feeding mechanism of claim 6, wherein the eccentric shaft and the limiting shaft further comprise a resilient clip connected to the end of the eccentric shaft and the limiting shaft. The stopping end is configured to automatically push the peripheral edge of the adjusting eccentric disk portion of the eccentric shaft and the peripheral edge of the disc head of the limiting shaft. The printing medium feeding mechanism of claim 6, wherein the limiting shaft further comprises a locking member disposed at the stopping end of the limiting shaft to assemble the adjusting eccentricity of the eccentric shaft. When the peripheral adjustment of the disc pushes against the periphery of the disc head of the limiting shaft, the limiting shaft is released, so that the second arm moves along the limiting slot relative to the fixed frame, and the adjustment is completed on the eccentric axle The limiting shaft is locked to the limiting slot of the fixing frame. The printing medium feeding mechanism of claim 1, wherein the driving shaft is a driving roller, the pressing shaft comprises at least one pressing roller, and when the driving roller rotates to drive the at least one pressing roller to rotate, The printing medium can be sandwiched between at least one of the pressing rollers and the driving roller. The printing medium feeding mechanism of claim 1, wherein the first axial hole of the first side wall of the fixing frame is another limiting groove, and the limiting groove of the second side wall is mutually connected to each other In contrast, the first sidewall includes a third shaft hole opposite to the second shaft hole of the second sidewall, the first arm further includes an eccentric shaft and an eccentric bore, and the eccentric shaft is disposed at the eccentric a wheel is perforated, and a circumference of the eccentric shaft of the first arm and a periphery of the first rotating shaft are mutually abutted, wherein the eccentric shaft of the first arm is pivotally connected to the third side of the first side wall of the fixing frame a first shaft, the first shaft is disposed in the first shaft hole of the first side wall of the fixed pivot frame, and when the eccentric shaft of the first arm rotates, the periphery of the eccentric shaft is pushed against the first shaft The periphery of the first arm is displaced along the first shaft hole, and the first arm is lifted by the elastic component with the first rotating shaft as an axis, and the pressing rotating shaft is pushed against the driving shaft. The printing medium feeding mechanism of claim 1, wherein the first arm comprises a first pivoting hole, and the second arm comprises a second pivoting hole, the first pivoting hole and the first pivoting hole The second pivot holes are opposite to each other, and respectively, the two ends of the pressing shaft are pivotally connected to the first arm and the second arm. The printing medium feeding mechanism of claim 1, wherein the printing medium feeding mechanism is constructed on a wide-format printer.