CN103568600A - Paper roll fixing device of printer - Google Patents

Abstract

The invention provides a paper roll fixing device of a printer, which is provided with a first supporting seat and a second supporting seat. The first supporting seat comprises a first supporting convex part and a plurality of first rollers, and the second supporting seat comprises a second supporting convex part and a plurality of second rollers. The first supporting convex part and the second supporting convex part respectively extend into two ends of the hollow axis of the paper roll so as to fix the paper roll between the first supporting seat and the second supporting seat and be supported by the first roller and the second roller. The paper roll fixing device can be suitable for paper rolls with hollow axes of different diameters.

Description

Paper roll holder for printer

technical field

The invention relates to a paper roll fixing device, in particular to a paper roll fixing device applied to a printer.

Background technique

There are many printers on the market that use roll paper as the output medium, such as label printers. The paper roll used by the label printer is composed of a hollow shaft and a paper tape wound around the hollow shaft. The paper tape includes a long strip of film and label paper attached to it at intervals. During the printing process, the paper tape is driven to make the label paper pass through the printing mechanism, so the printing mechanism prints on the label paper. During the printing process, the label paper is continuously output from the label printer, and the paper roll rotates accordingly and the overall diameter gradually decreases. Therefore, a fixed structure or support structure needs to be set inside the label printer to prevent the paper roll from bouncing up and down, shifting left and right during the rotation process, etc., which will affect the smoothness of rotation and printing.

Figure 1 shows an exploded schematic view of a conventional label printer. Firstly, components of a conventional label printer will be described. The label printer 1 includes a paper roll fixing device 11 and a housing 12 , wherein the paper roll fixing device 11 is disposed inside the housing 12 .

The paper roll fixing device 11 includes a first support base 111 , a second support base 112 , a first movable track 113 , a second movable track 114 and a wheel 115 . The first supporting base 111 includes a first supporting protrusion 111a, and the second supporting base 112 includes a second supporting protrusion (not shown in the figure) identical to the first supporting protrusion 111a.

In addition, the first supporting convex portion 111a has a first annular portion 111aa, a second annular portion 111ab, and a third annular portion 111ac with different outer circumferences, and the second supporting convex portion has a , the fourth annular portion, the fifth annular portion and the sixth annular portion (not shown in the figure) having the same outer circumference length of the second annular portion 111ab and the third annular portion 111ac, wherein the first annular portion The outer circumference of 111aa is smaller than the outer circumference of the second annular portion 111ab, and the outer circumference of the second annular portion 111ab is smaller than the outer circumference of the third annular portion 111ac.

Next, the assembly sequence of the existing label printer will be described, please continue to refer to FIG. 1 . Firstly, one end 113 a of the first moving track 113 is connected to the first supporting base 111 , and one end 114 a of the second moving track 114 is connected to the second supporting base 112 . Moreover, the first moving track 113 and the second moving track 114 are parallel to each other, and are respectively clamped and engaged with the rotating wheel 115 .

In addition, the first support seat 111 is parallel to the second support seat 112 , and the first support protrusion 111 a and the second support protrusion face each other.

Next, the operation process of the existing label printer will be described, please continue to refer to FIG. 1 . As mentioned above, the paper roll is composed of a hollow shaft and a paper tape wound around the hollow shaft. When the paper roll is to be placed inside the label printer 1, the first support base 111 or the second support base 112 is first pulled. , so that the first movable track 113 and the second movable track 114 are moved linearly by the drive of the runner 115, so that the first support base 111 and the second support base 112 are far away from each other, and then one end of the hollow axis of the paper roll The first supporting convex portion 111 a of the first supporting base 111 is engaged.

Then move the second support base 112, so that the second support base 112 is driven by the running wheel 115 to approach the first support base 111 until the second support protrusion of the second support base 112 engages with the paper roll. The other end of the hollow shaft is used to fix the paper roll inside the label printer 1 .

If the inner circumference of the hollow axis is the same as the outer circumference of the first annular portion 111aa, the first annular portion 111aa is inserted into one end of the hollow axis of the paper roll, and the fourth annular portion is inserted into the hollow shaft of the paper roll. The other end of the core, and the first ring portion 111aa and the fourth ring portion abut against the inner edge of the hollow shaft of the paper roll to fix the position of the paper roll.

Similarly, if the inner circumference of the hollow axis is the same as the outer circumference of the second annular portion 111ab, the second annular portion 111ab and the fifth annular portion are respectively clamped into the two ends of the hollow axis of the paper roll. When the inner circumference of the hollow axis is the same as that of the third annular portion 111ac, the third annular portion 111ac and the sixth annular portion are inserted into both ends of the hollow axis of the paper roll respectively.

Based on the above, it can be known that the label printer 1 fixes the position of the paper roll by engaging the ring portion with the hollow shaft of the paper roll.

The conventional label printer 1 has the following problems. Depending on the brand, the hollow shaft of the paper roll may have different inner circumferences. No matter what the inner circumference of the hollow shaft is, the width of the paper roll will not change. To set the With multiple annular parts, the space occupied by the paper roll fixing device and the volume of the housing will be very large.

If only a plurality of annular parts suitable for paper rolls of some specifications are provided, once the inner circumference of the hollow axis of the paper roll is greater than the maximum outer circumference of the plurality of annular parts, the paper roll will fall downward due to gravity Moving, its bottom will be pressed against the housing 12.

Therefore, during the printing process, although the paper roll will not move left and right, when the paper roll rotates, its paper tape will rub against the casing 12, which will not only cause the paper tape to move unsmoothly, but also may cause the label paper to wear or fall off.

Therefore, there is a need for an improved paper roll fixing device of a label printer to overcome the problems of the existing paper roll fixing device of a label printer.

Contents of the invention

The object of the present invention is to provide a paper roll fixing device for a printer suitable for paper rolls of various specifications.

The object of the present invention is to provide a paper roll fixing device for a printer, which is used to fix a paper roll with a hollow shaft inside a printer, including:

A first support base, comprising:

a first supporting protrusion;

a plurality of first auxiliary rollers arranged at intervals below the first supporting protrusion and adjacent to the bottom of the first supporting base;

A second support base, parallel to the first support base, includes:

a second support protrusion; and

a plurality of second auxiliary rollers arranged at intervals below the second supporting protrusion and adjacent to the bottom of the second supporting seat;

Wherein the first support protrusion extends into the hollow shaft from a first end of the paper roll, and the second support protrusion extends into the hollow shaft from a second end of the paper roll, so that the paper roll is It is fixed between the first supporting seat and the second supporting seat, and the two ends of an outer surface of the paper roll respectively press against the plurality of first auxiliary rollers and the plurality of second auxiliary rollers.

In a preferred embodiment, the first support base further includes a first bottom plate vertically extending from the bottom of a first inner surface of the first support base, and the plurality of first auxiliary rollers are arranged at intervals on the first support base. bottom plate.

In a preferred embodiment, the second support base further includes a second bottom plate vertically extending from the bottom of a second inner surface of the second support base, and the plurality of second auxiliary rollers are arranged at intervals on the second support base. bottom plate.

In a preferred embodiment, it further includes:

a wheel;

a first movable track, connected to the first support seat, and engaged with the runner; and

a second movable track, parallel to the first movable track, connected to the second support seat, and engaged with the runner;

Wherein the first support base and the second support base reciprocate in a straight line through the rotating wheel to adjust the distance between the first support base and the second support base.

In a preferred embodiment, the first supporting protrusion protrudes from the first inner surface and includes a first protrusion and a second protrusion, wherein the first protrusion is located above the second protrusion The second supporting protrusion protrudes from the second inner surface and includes a third protrusion and a fourth protrusion, wherein the third protrusion is located above the fourth protrusion.

In a preferred embodiment, the first support base further includes:

a first hole opened in the first supporting seat;

A first rotating shaft is arranged on a first outer surface of the first supporting seat;

a first fixing piece pivotally arranged on the first rotating shaft and located in the first hole;

a first elastic element, disposed above the first rotating shaft, and connected to the first fixing piece; and

a first support piece, arranged in the first hole and below the first fixing piece;

Wherein the first protrusion is arranged on the first fixing piece, the second protrusion is arranged on the first supporting piece, and the first elastic element prevents the first protrusion of the first fixing piece from protruding from the first fixing piece. The first inner surface of a support seat, and one end of the first fixing piece protrudes from the first inner surface of the first support seat.

In a preferred embodiment, the second support base further includes:

a second hole opened in the second support seat;

A second rotating shaft is arranged on a second outer surface of the second supporting seat;

a second fixing piece pivotally arranged on the second rotating shaft and located in the second hole;

A second elastic element is arranged above the second rotating shaft and connected to one end of the second fixing piece; and

A second supporting piece is arranged in the second hole and under the second fixing piece;

Wherein the third protrusion is arranged on the second fixing piece, the fourth protrusion is arranged on the second supporting piece, and the second elastic element prevents the third protrusion of the second fixing piece from protruding from the first fixing piece. The second inner surface of the second supporting base is configured so that one end of the second fixing piece protrudes from the second inner surface of the second supporting base.

In a preferred embodiment, the first supporting piece and the second supporting piece are made of flexible material.

In a preferred embodiment, the second protruding block and the fourth protruding block respectively include two oblique cut surfaces for guiding the paper roll to enter or leave between the first supporting seat and the second supporting seat.

In a preferred embodiment, the first supporting protrusion and the second supporting protrusion are both ring-shaped protrusions.

In a preferred embodiment, wherein the first support base further includes a through hole and a locking device, the printer further includes a plurality of second teeth located inside, wherein the locking device is disposed in the through hole, having A plurality of first tooth parts are used for engaging with the plurality of second tooth parts to fix the first supporting seat.

The paper roll fixing device of the printer proposed by the invention can be applied to paper rolls with hollow shafts of different diameters.

Description of drawings

Figure 1 shows an exploded schematic view of a conventional label printer.

FIG. 2 shows a perspective view of a printer according to a preferred embodiment of the present invention.

FIG. 3 is an exploded schematic diagram of a first angle of a paper roll fixing device according to a preferred embodiment of the present invention.

FIG. 4 shows a perspective view of a second angle of the paper roll fixing device according to a preferred embodiment of the present invention.

FIG. 5 shows an exploded view of a paper roll fixing device and a paper roll according to a preferred embodiment of the present invention.

FIG. 6 shows a cross-sectional view of a paper roll with a hollow core of a first size placed between a first supporting base and a second supporting base according to a first preferred embodiment of the present invention.

FIG. 7 shows a cross-sectional view of a paper roll with a hollow core of a second size placed between the first supporting base and the second supporting base according to a first preferred embodiment of the present invention.

FIG. 8 is an exploded schematic diagram of a first angle of a paper roll fixing device according to a second preferred embodiment of the present invention.

FIG. 9 is an exploded schematic diagram of a second angle of a paper roll fixing device according to a second preferred embodiment of the present invention.

FIG. 10 shows an assembly view of a first angle of a paper roll fixing device according to a second preferred embodiment of the present invention.

FIG. 11 shows an assembly view of a second angle of the paper roll fixing device according to a second preferred embodiment of the present invention.

FIG. 12 shows a cross-sectional view of a paper roll fixing device according to a second preferred embodiment of the present invention when the paper roll is not inserted.

Fig. 13 is a cross-sectional view of a paper roll fixing device according to a second preferred embodiment of the present invention when the paper roll is inserted.

FIG. 14 shows a perspective view of a paper roll fixing device of a third preferred embodiment of the present invention from a first angle.

FIG. 15 shows a perspective view of a second angle of a paper roll fixing device according to a third preferred embodiment of the present invention.

Wherein, the reference signs are explained as follows:

Label printer 1 first bottom plate 221b

Paper roll fixing device 11 first inner surface 221c

Housing 12 Locking device 221d

The first support seat 111 perforation 221e

The first support convex part 111a The first tooth part 221da

The first annular part 111aa The second support seat 222

Second annular part 111ab Second support convex part 222a

The third annular part 111ac the third protrusion 222aa

The second support seat 112 The fourth protrusion 222ab

The first movable track 113 The second bottom plate 222b

One end 113a Second inner surface 222c

The second movable track 114 The first auxiliary roller 223

One end 114a Second auxiliary roller 224

Runner 115 Runner 225

Printer 2 The first active track 226

Base 21 Second movable track 227

The second tooth part 21a paper roll a

Paper roll fixing device 22 first end a1

The first support seat 221 The second end a2

The first support convex part 221a hollow axis b

First bump 221aa paper tape c

The second bump 221ab The first diameter d

The first paper roll a' first end 315b

Hollow axis b' second side 315c

Paper tape c' second end 315d

The second diameter d' the first elastic element 316

The second paper roll a" the first support piece 317

Hollow axis b” Second support seat 32

Paper tape c" Second outer surface 32a

Paper outlet e Second inner surface 32b

Paper roll fixing device 3 Second supporting convex part 321

The first support seat 31 the third protrusion 321a

First outer surface 31a Fourth bump 321b

The first inner surface 31b The first beveled surface s3

The first support convex part 311 The second oblique cut surface s4

The first bump 311a The second bottom plate 322

Second bump 311b Second hole 323

The first inclined plane s1 The second rotating shaft 324

The second beveled surface s2 The second fixed piece 325

The first bottom plate 312 The first side 325a

First hole 313 First end 325b

The first shaft 314 The second side 325c

The first fixed piece 315 The second end 325d

First side 315a Second elastic element 326

The second support piece 327 The first bottom plate 41b

First auxiliary roller 33 First inner surface 41c

The second auxiliary roller 34 The second support seat 42

Runner 35 Second supporting convex part 42a

The first movable track 36 The second bottom plate 42b

Second movable track 37 Second inner surface 42c

Paper roll 38 The first auxiliary roller 43

Paper tape 38a Second auxiliary roller 44

Hollow shaft 38b runner 45

The first support seat 41 The first movable track 46

The first support convex part 41a the second movable track 47

Detailed ways

According to a specific embodiment of the present invention, a paper roll fixing device for a printer is provided, which can be applied to a label printer.

Please note that the first to third preferred embodiments of the present invention described below are all described in the case of setting three first auxiliary rollers and three second auxiliary rollers, but the first auxiliary rollers and the second auxiliary rollers of the present invention The number of the rollers is not limited thereto, as long as a plurality of first auxiliary rollers and a plurality of second auxiliary rollers are respectively arranged on the first support seat and the second support seat to support the paper roll, all belong to the scope of the present invention.

First, components of a printer according to a first preferred embodiment of the present invention will be described. Please refer to FIG. 2 . FIG. 2 shows a perspective view of a printer according to a first preferred embodiment of the present invention. The printer 2 has a base 21 , a paper roll fixing device 22 and an upper cover (not shown in the figure). The paper roll fixing device 22 is disposed inside the base 21 , as shown in FIG. 2 , and the upper cover is pivotally connected to the base 21 and can rotate relative to the base 21 to an open position or a closed position.

Please refer to FIG. 3 and FIG. 4 at the same time. FIG. 3 shows an exploded schematic diagram of a first angle of the paper roll fixing device of a first preferred embodiment of the present invention, and FIG. 4 shows a paper roll fixing of a first preferred embodiment of the present invention. A perspective view of the device from a second angle. The paper roll fixing device 22 includes a first support base 221 , a second support base 222 , three first auxiliary rollers 223 , three second auxiliary rollers 224 , a rotating wheel 225 , a first movable track 226 and a second movable track 227 .

The first support seat 221 includes a first support protrusion 221 a and a first bottom plate 221 b, and the second support seat 222 includes a second support protrusion 222 a and a second bottom plate 222 b. The first supporting protrusion 221a includes a first protrusion 221aa and a second protrusion 221ab, and the second supporting protrusion 222a includes a third protrusion 222aa and a fourth protrusion 222ab.

Next, the assembly sequence of the printer according to a first preferred embodiment of the present invention will be described. Please continue to refer to FIG. 3 and FIG. 4 . Firstly, the first protrusion 221aa and the second protrusion 221ab protrude from the first inner surface 221c of the first support base 221 , and the first protrusion 221aa is located above the second protrusion 221ab. The third protrusion 222aa and the fourth protrusion 222ab protrude from the second inner surface 222c of the second support base 222 , and the third protrusion 222aa is located above the fourth protrusion 222ab.

The first bottom plate 221b vertically extends from the bottom of the first inner surface 221c of the first supporting base 221 , and three first auxiliary rollers 223 are spaced on the first bottom plate 221b and located below the first supporting protrusion 221a. The second bottom plate 222b vertically extends from the bottom of the second inner surface 222c of the second supporting base 222 , and three second auxiliary rollers 224 are spaced on the second bottom plate 222b and located below the second supporting protrusion 222a.

Next, the first movable track 226 is connected to the first support base 221 and is perpendicular to the first support base 221, the second movable track 227 is connected to the second support base 222 and is perpendicular to the second support base 222, and the first support base The first supporting protrusion 221 a of the support seat 221 and the second supporting protrusion 222 a of the second supporting seat 222 face each other.

Moreover, the first moving track 226 is parallel to the second moving track 227 and engaged with the rotating wheels 225 respectively.

When the first support base 221 is moved, the first movable track 226 can link the second movable track 227 through the rotating wheel 225, so that the second support base 222 moves towards or away from the first support base 221 to adjust the first support base 222. The distance between the first supporting base 221 and the second supporting base 222 .

Similarly, when the second support base 222 is moved, the first support base 221 can also be linked to change the distance between it and the second support base 222 .

It should be added that please refer to FIG. 2 and FIG. 3 at the same time. In this first preferred embodiment, the first support base 221 further includes a locking device 221d having a plurality of first tooth portions 221da and a through hole 221e, The base 21 further includes a plurality of second tooth portions 21a.

Wherein the locking device 221d is disposed in the through hole 221e, when the locking device 221d is moved upwards so that the plurality of first tooth portions 221da are not engaged with the plurality of second tooth portions 21a, the first support base 221 can be moved to The first moving track 226 is connected to the second moving track 227 and the second supporting seat 222 through the rotating wheel 225 .

But when the locking device 221d is moved down until the plurality of first tooth portions 221da are engaged with the plurality of second tooth portions 21a, the first support base 221 cannot be moved, so the first movable track 226 prevents the rotating wheel 225 from rotating. Therefore, the second movable track 227 and the second supporting base 222 cannot be displaced.

Next, the operation flow of the printer in a first preferred embodiment of the present invention will be described. Please refer to FIG. 3 to FIG. 5 at the same time. FIG. 5 shows an exploded view of a paper roll fixing device and a paper roll according to a first preferred embodiment of the present invention. As shown in FIG. 5 , the paper roll a is composed of a hollow shaft b and a paper tape c wound around the hollow shaft b. Move up, so that the first supporting base 221 and the second supporting base 222 can move freely. Then pull the first support seat 221 or the second support seat 222, so that the first support seat 221 and the second support seat 222 are far away from each other, and then the first support protrusion 221a is stretched into the hollow shaft from the first end a1 of the paper roll a heart b.

Then the user stops pulling the first support seat 221 or the second support seat 222, and the second support seat 222 and the first support seat 221 are close to each other until the second support convex portion 222a of the second support seat 222 is lifted from the paper roll a. The second end a2 extends into the hollow shaft b to fix the paper roll a between the first supporting base 221 and the second supporting base 222 .

Finally, the locking device 221d is pressed down, which can prevent the first supporting base 221 and the second supporting base 222 from being displaced during the printing process.

The situation that paper rolls with hollow shafts of different sizes are placed between the first support base 221 and the second support base 222 will be described below, please refer to Fig. 3, Fig. 4, Fig. 6 and Fig. 7, Fig. 6 A cross-sectional view showing a first preferred embodiment of the present invention in which a paper roll with a hollow axis of the first size is placed between the first support base and the second support base, FIG. 7 shows a first preferred embodiment of the present invention A cross-sectional view of a paper roll with a hollow axis of the second size placed between the first support seat and the second support seat of the embodiment.

As shown in FIG. 6, when the first paper roll a' having the hollow core b' of the first diameter d is disposed between the first support base 221 and the second support base 222, the first support protrusion 221a and the second support base 222 The second supporting protrusions 222a are snapped into the two ends of the hollow axis b' respectively. At this time, the tops of the first protrusion 221aa and the third protrusion 222aa respectively abut against the inner walls of the two ends of the hollow axis b', and the second protrusions Bottoms of the 221ab and the fourth protrusion 222ab respectively abut against the inner walls at both ends of the hollow axis b′.

The two ends of the outer surface of the paper tape c' are respectively pressed down against the three first auxiliary rollers 223 and the three second auxiliary rollers 224.

Then the first supporting protrusion 221a and the second supporting protrusion 222a support the hollow axis b', so that the first paper roll a' will not touch the base 21 downwards. At this time, the three first auxiliary rollers 223 and the three third auxiliary rollers The two auxiliary rollers 224 can assist the paper tape c' to move more smoothly during the printing process.

Please refer to FIG. 7, when the second paper roll a" with the hollow axis b" of the second diameter d' is set between the first support seat 221 and the second support seat 222, wherein the second diameter d' greater than the first diameter d, the first protrusion 221aa and the second protrusion 221ab extend into one end of the hollow axis b", the third protrusion 222aa and the fourth protrusion 222ab extend into the other end of the hollow axis b", but The first bump 221aa, the second bump 221ab, the third bump 222aa and the fourth bump 222ab are not in contact with the inner wall of the hollow axis b″.

Therefore, at this time, the first supporting convex part 221a and the second supporting convex part 222a cannot support the hollow axis b", and the second paper roll a" will move downward due to the action of gravity. Most importantly, at this time, due to the three first The auxiliary roller 223 and the three second auxiliary rollers 224 abut against the two ends of the outer surface of the paper tape c" from the second paper roll a" below and support the second paper roll a", so that the paper tape c" does not contact the base 21 At the same time, the three first auxiliary rollers 223 and the three second auxiliary rollers 224 can assist the movement of the paper tape c", making the printing process smoother.

When the second paper roll a" is used for a period of time, the length of the paper tape c" will become shorter and shorter, so the position of the hollow axis b" will gradually decrease until the inner walls of the two ends of the hollow axis b" are respectively pressed against the first The bump 221aa ends with the third bump 222aa.

At this time, the first protruding block 221aa and the third protruding block 222aa can support the second paper roll a", and maintain the position of the second paper roll a", so as to prevent the hollow axis b" from continuously increasing and falling due to gravity. Otherwise, the second paper roll a" will jump up and down during the printing process, which will affect the printing performance.

It should be added that the first diameter d is the smallest diameter of the hollow core of the paper roll currently on the market.

The paper roll fixing device 22 of the present invention is not limited to the above-mentioned structure. Next, the elements of the paper roll fixing device of a second preferred embodiment of the present invention will be described. Please refer to FIGS. 8 to 11 simultaneously. FIG. 8 shows the present invention An exploded schematic diagram of a first angle of the paper roll fixing device of a second preferred embodiment, FIG. 9 shows an exploded schematic diagram of a second angle of a paper roll fixing device of a second preferred embodiment of the present invention, and FIG. An assembly view of a paper roll fixing device of a second preferred embodiment at a first angle, FIG. 11 shows an assembly view of a paper roll fixing device of a second preferred embodiment of the present invention at a second angle.

The paper roll fixing device 3 includes a first supporting base 31 , a second supporting base 32 , three first auxiliary rollers 33 , three second auxiliary rollers 34 , a rotating wheel 35 , a first movable track 36 and a second movable track 37 .

The first support seat 31 includes a first support protrusion 311, a first bottom plate 312, a first hole 313, a first rotating shaft 314, a first fixing piece 315, a first elastic element 316 and a first support piece 317, and the second support The seat 32 includes a second supporting protrusion 321 , a second bottom plate 322 , a second hole 323 , a second rotating shaft 324 , a second fixing piece 325 , a second elastic element 326 and a second supporting piece 327 . The first supporting protrusion 311 includes a first protrusion 311a and a second protrusion 311b, and the second supporting protrusion 321 includes a third protrusion 321a and a fourth protrusion 321b.

In addition, the second protrusion 311b includes a first beveled surface s1 and a second beveled surface s2 , and the fourth protrusion 321b includes a first beveled surface s3 and a second beveled surface s4 . The first supporting piece 317 and the second supporting piece 327 are made of flexible material.

Next, the assembly sequence of the paper roll fixing device according to a second preferred embodiment of the present invention will be described. Please continue to refer to FIG. 8 to FIG. 11 .

Firstly, the first hole 313 is opened on the first supporting seat 31 , the first rotating shaft 314 is arranged on the first outer surface 31 a of the first supporting seat 31 , and the first elastic element 316 is also arranged on the first outer surface of the first supporting seat 31 . The surface 31 a is located above the first rotating shaft 314 .

The first support piece 317 protrudes upwards from the bottom edge of the first hole 313 , and the second protrusion 311 b protrudes from the first support piece 317 and protrudes from the first inner surface 31 b of the first support seat 31 .

Moreover, the first rotating shaft 314 is pivotally connected to the first surface 315a of the first fixing piece 315, so that the first fixing piece 315 is located above the first supporting piece 317 in the first hole 313, and the first elastic element 316 is formed from the first support piece 317. The first surface 315 a of a fixing piece 315 is connected to the first end 315 b of the first fixing piece 315 , and the first protrusion 311 a protrudes from the second surface 315 c of the first fixing piece 315 .

Next, the second hole 323 is opened on the second support base 32 , the second rotating shaft 324 is disposed on the second outer surface 32 a of the second support base 32 , and the second elastic element 326 is also disposed on the second outer surface of the second support base 32 . The surface 32a is located above the second rotating shaft 324 .

The second support piece 327 protrudes upwards from the bottom edge of the second hole 323 , and the fourth protrusion 321 b protrudes from the second support piece 327 and protrudes from the second inner surface 32 b of the second support seat 32 .

Moreover, the second rotating shaft 324 is pivotally connected to the first surface 325a of the second fixing piece 325, so that the second fixing piece 325 is located above the second supporting piece 327 in the second hole 323, and the second elastic element 326 is connected from the first The first surface 325 a of the second fixing piece 325 is connected to the first end 325 b of the second fixing piece 325 , and the second protrusion 321 a protrudes from the second surface 325 c of the second fixing piece 325 .

In addition, the first bottom plate 312 vertically extends from the bottom of the first inner surface 31 b of the first supporting base 31 , and three first auxiliary rollers 33 are spaced on the first bottom plate 312 and located below the first supporting protrusion 311 . The second bottom plate 322 vertically extends from the bottom of the second inner surface 32 b of the second supporting seat 32 , and the three second auxiliary rollers 34 are spaced on the second bottom plate 322 and located below the second supporting protrusion 321 .

Then, the first movable track 36 is connected to the first support seat 31 and is perpendicular to the first support seat 31, the second movable track 37 is connected to the second support seat 32 and is perpendicular to the second support seat 32, and the first support seat The first supporting protrusion 311 of 31 and the second supporting protrusion 321 of the second supporting seat 32 face each other.

Finally, the first movable track 36 is parallel to the second movable track 37 and engaged with the rotating wheels 35 respectively.

After the paper roll is placed between the first supporting seat 31 and the second supporting seat 32, during the printing process, the first supporting convex part 311, the second supporting convex part 321, the three first auxiliary rollers 33 and the three The operation principle of the second auxiliary roller 34 is the same as that of the first preferred embodiment, so it will not be repeated here.

A second preferred embodiment of the present invention differs from the first preferred embodiment in that when the user puts the paper roll down between the first support seat 31 and the second support seat 32, the first protrusion 311a, the second protrusion 311b, the third protrusion 321a and the fourth protrusion 321b will automatically extend into the hollow axis of the paper roll, which will be described in detail below.

Please refer to Figure 10 to Figure 13 at the same time, Figure 12 shows a sectional view of a paper roll fixing device of a second preferred embodiment of the present invention when the paper roll is not inserted, Figure 13 shows a second preferred embodiment of the present invention The cross-sectional view of the paper roll fixing device when the paper roll is inserted. The paper roll 38 includes a hollow shaft 38b and a paper tape 38a wound around the hollow shaft 38b. When the paper roll 38 has not been inserted, the first end 315b of the first fixing piece 315 is driven by the pulling force of the first elastic member 316, and rotates around the first rotating shaft 314 to the first outer surface 31a of the first support seat 31. Move so that the first protrusion 311a does not protrude from the first inner surface 31b, but the second end 315d of the first fixing piece 315 protrudes from the first inner surface 31b.

Similarly, the first end 325b of the second fixing piece 325 is driven by the pulling force of the second elastic element 326, and rotates around the second rotating shaft 324 to move toward the second outer surface 32a of the second supporting seat 32, so that the third protrusion The block 321a does not protrude from the second inner surface 32b of the second supporting seat 32, but the second end 325d of the second fixing piece 325 protrudes from the second inner surface 32b.

When the paper roll is placed between the first support seat 31 and the second support seat 32 from top to bottom, both ends of the paper roll 38 push the second end 315d of the first fixing piece 315 and the second end 315d of the second fixing piece 325 simultaneously. Two ends 325d, so the second end 315d of the first fixed piece 315 rotates around the first rotating shaft 314 and moves toward the first outer surface 31a of the first supporting base 31, and the second end of the second fixed piece 325 also rotates around the first rotating shaft 314. The second rotating shaft 324 rotates around the center and moves toward the second outer surface 32 a of the second support base 32 .

Then the two ends of the paper roll 38 continue to press down on the second projection 311b of the first support piece 317 and the fourth projection 321b of the second support piece, so that the second projection 311b moves toward the first projection of the first support seat 31. When the outer surface 31a moves, the fourth protrusion 321b moves toward the second outer surface 32a of the second support seat 32, and the first bevel s1 of the second protrusion 311b and the first bevel s3 of the fourth protrusion 321b make Roll 38 passed without a hitch.

When the paper roll 38 is completely placed between the first support base 31 and the second support base 32, the first fixing piece 315 and the second fixing piece 325 rotate to be parallel to the first support base 31 and the second support base 32, At this time, the first protrusion 311a of the first fixing piece 315 protrudes from the first inner surface 31b of the first support base 31, and the third protrusion 321a of the second fixing piece 325 also protrudes from the first inner surface 31b of the second support base 32. The two inner surfaces 32b, so the first protrusion 311a and the third protrusion 321a extend into the hollow shaft 38b of the paper roll 38, and their tops respectively abut against the inner walls at both ends of the hollow shaft 38b.

At this time, the first support piece 317 and the second support piece 327 are no longer subjected to the thrust of the paper roll 38, that is, rely on their own toughness to return to their original positions, so the second protrusion 311b and the fourth protrusion 321b extend into the hollow shaft core 38b, and the bottoms of which respectively abut against the inner walls of both ends of the hollow shaft 38b, and the paper roll 38 is firmly fixed between the first support base 31 and the second support base 32.

And when the paper roll 38 was taken out from between the first support seat 31 and the second support seat 32, the two ends of the paper roll 38 upwardly touched the second protrusion 311b of the first support piece 317 and the second support piece 327. The fourth protrusion 321b makes the second protrusion 311b move toward the first outer surface 31a of the first supporting base 31, the fourth protrusion 321b then moves towards the second outer surface 32a of the second supporting base 32, and the second protrusion The second oblique surface s2 of the block 311b and the second oblique surface s4 of the fourth protrusion 321b allow the paper roll 38 to pass through smoothly.

At the same time, the second end 315d of the first fixing piece 315 and the second end 325d of the second fixing piece 325 are no longer pushed by the paper roll 38, so the restoring force provided by the first elastic member 316 makes the first fixing piece 315 The end 315b rotates around the first rotating shaft 314 and moves toward the first outer surface 31a of the first support base 31, the first protrusion 311a returns to its original position and no longer protrudes from the first inner surface 31b, and the second fixed The first end 325b of the piece 325 also rotates around the second rotating shaft 324 and moves toward the second outer surface 32a of the second support seat 32, and the third protrusion 321a returns to its original position and no longer protrudes from the second inner surface. 32b, so that the paper roll 38 is not blocked and can be taken out upwards smoothly.

When the paper roll 38 is completely taken out, the second protrusion 311 b and the fourth protrusion 321 b are no longer pushed by the paper roll 38 , that is, return to their original positions according to their own toughness.

The paper roll fixing device of the present invention is not limited to the above two structures. The paper roll fixing device of a third preferred embodiment of the present invention will be described below. Please refer to Figure 14 and Figure 15 at the same time. Figure 14 shows a first embodiment of the present invention. The perspective view of the first angle of the paper roll fixing device of the third preferred embodiment, FIG. 15 shows the perspective view of the second angle of the paper roll fixing device of a third preferred embodiment of the present invention.

First, the components of a paper roll fixing device according to a third preferred embodiment of the present invention will be described. The paper roll fixing device 4 includes a first support base 41 , a second support base 42 , three first auxiliary rollers 43 , three second auxiliary rollers 44 , a rotating wheel 45 , a first movable track 46 and a second movable track 47 .

The first support seat 41 includes a first support protrusion 41 a and a first bottom plate 41 b, and the second support seat 42 includes a second support protrusion 42 a and a second bottom plate 42 b.

Next, the assembly sequence of the paper roll fixing device of a third preferred embodiment of the present invention will be described, please continue to refer to FIG. 14 and FIG. 15 . Firstly, the first supporting protrusion 41 a protrudes from the first inner surface 41 c of the first supporting base 41 , and the second supporting protrusion 42 a protrudes from the second inner surface 42 c of the second supporting base 42 .

The first bottom plate 41b vertically extends from the bottom of the first inner surface 41c of the first supporting base 41 , and three first auxiliary rollers 43 are spaced apart on the first bottom plate 41b and located below the first supporting protrusion 41a. The second bottom plate 42b vertically extends from the bottom of the second inner surface 42c of the second supporting base 42 , and three second auxiliary rollers 44 are spaced on the second bottom plate 42b and located below the second supporting protrusion 42a.

Then, the first movable track 46 is connected to the first support seat 41 and is perpendicular to the first support seat 41, and the second movable track 47 is connected to the second support seat 42 and is perpendicular to the second support seat 42, and the first support seat The first supporting convex portion 41a of 41 and the second supporting convex portion 42a of the second supporting seat 42 face each other.

Furthermore, the first movable track 46 is parallel to the second movable track 47 and engaged with the rotating wheels 45 respectively.

Different from the first preferred embodiment of the present invention, the first supporting protrusion 41a and the second supporting protrusion 42a are both ring-shaped protrusions, as shown in FIG. 14 and FIG. 15 , and the diameter of the ring-shaped protrusions It is equal to the first diameter d of the hollow axis b' of the first paper roll a' in FIG. 6 .

The operation process of the paper roll fixing device 4 is the same as that of the paper roll fixing device 2 , so it will not be repeated here.

It can be seen from the above preferred embodiments that the present invention enables the paper roll fixing device to be suitable for hollow paper rolls with various diameters through the arrangement of the first supporting protrusion, the second supporting protrusion, the first auxiliary roller and the second auxiliary roller. Axis scroll.

Based on the above, the paper roll fixing device of the printer of the present invention makes it unnecessary to set the support convex part of the paper roll that meets all specifications, and only needs to set the support convex part of the hollow axis that meets the smallest diameter on the market. In combination with the auxiliary rollers arranged under the supporting protrusions, the purpose of supporting paper rolls with hollow shafts of various diameters can be achieved. This not only simplifies the overall structure of the paper roll fixing device, but also reduces the manufacturing cost and the required volume, and the user does not need to cooperate with the supporting convex part to purchase paper rolls, which not only improves the existing shortcomings but also brings Ease of use.

The above-described embodiments are only to illustrate the technical ideas and characteristics of the present invention, and its purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly. Equivalent changes or modifications made according to the spirit disclosed in the present invention should still be covered within the patent scope of the present invention.

Claims (11)

1. A paper roll fixing device of a printer, used for fixing a paper roll with a hollow shaft center inside a printer, characterized in that the paper roll fixing device of the printer comprises: A first support base, comprising: a first supporting protrusion; a plurality of first auxiliary rollers arranged at intervals below the first supporting protrusion and adjacent to the bottom of the first supporting base; A second support base, parallel to the first support base, includes: a second support protrusion; and a plurality of second auxiliary rollers arranged at intervals below the second supporting protrusion and adjacent to the bottom of the second supporting seat; Wherein the first support protrusion extends into the hollow shaft from a first end of the paper roll, and the second support protrusion extends into the hollow shaft from a second end of the paper roll, so that the paper roll is It is fixed between the first supporting seat and the second supporting seat, and the two ends of an outer surface of the paper roll respectively press against the plurality of first auxiliary rollers and the plurality of second auxiliary rollers. 2. The paper roll fixing device of the printer according to claim 1, wherein the first support seat further comprises a first bottom plate, and the first bottom plate vertically extends from the bottom of a first inner surface of the first support seat, The plurality of first auxiliary rollers are arranged at intervals on the first bottom plate. 3. The paper roll fixing device of the printer according to claim 2, wherein the second support seat further comprises a second bottom plate, the second bottom plate vertically extends from the bottom of a second inner surface of the second support seat, The plurality of second auxiliary rollers are arranged at intervals on the second bottom plate. 4. The paper roll fixing device of the printer according to claim 3, further comprising: a wheel; a first movable track, connected to the first support seat, and engaged with the runner; and a second movable track, parallel to the first movable track, connected to the second support seat, and engaged with the runner; Wherein the first support base and the second support base reciprocate in a straight line through the rotating wheel to adjust the distance between the first support base and the second support base. 5. The paper roll fixing device of the printer according to claim 4, wherein the first supporting protrusion protrudes from the first inner surface and includes a first protrusion and a second protrusion, wherein the first protrusion The block is located above the second protrusion, and the second support protrusion protrudes from the second inner surface, including a third protrusion and a fourth protrusion, wherein the third protrusion is located on the fourth protrusion above. 6. The paper roll fixing device of the printer according to claim 5, wherein the first support seat further comprises: a first hole opened in the first supporting seat; A first rotating shaft is arranged on a first outer surface of the first supporting seat; a first fixing piece pivotally arranged on the first rotating shaft and located in the first hole; a first elastic element, disposed above the first rotating shaft, and connected to the first fixing piece; and a first support piece, arranged in the first hole and below the first fixing piece; Wherein the first protrusion is arranged on the first fixing piece, the second protrusion is arranged on the first supporting piece, and the first elastic element prevents the first protrusion of the first fixing piece from protruding from the first fixing piece. The first inner surface of a support seat, and one end of the first fixing piece protrudes from the first inner surface of the first support seat. 7. The paper roll fixing device of the printer according to claim 6, wherein the second support seat further comprises: a second hole opened in the second supporting seat; A second rotating shaft is arranged on a second outer surface of the second supporting seat; a second fixing piece pivotally arranged on the second rotating shaft and located in the second hole; A second elastic element is arranged above the second rotating shaft and connected to one end of the second fixing piece; and A second supporting piece is arranged in the second hole and under the second fixing piece; Wherein the third protrusion is arranged on the second fixing piece, the fourth protrusion is arranged on the second supporting piece, and the second elastic element prevents the third protrusion of the second fixing piece from protruding from the first fixing piece. The second inner surface of the second supporting base is configured so that one end of the second fixing piece protrudes from the second inner surface of the second supporting base. 8. The paper roll fixing device of a printer as claimed in claim 7, wherein the first support piece and the second support piece are made of flexible material. 9. The paper roll fixing device of the printer according to claim 8, wherein the second protrusion and the fourth protrusion respectively comprise two oblique cut surfaces to guide the paper roll into or out of the first support base and the first supporting seat Between the second support seat. 10. The paper roll fixing device of a printer as claimed in claim 1, wherein the first supporting protrusion and the second supporting protrusion are both ring-shaped protrusions. 11. The paper roll fixing device of a printer according to claim 1, wherein the first support seat further comprises a perforation and a locking device, and the printer further comprises a plurality of second teeth located inside it, wherein the lock The fixing device is arranged in the through hole, and has a plurality of first tooth parts for engaging with the plurality of second tooth parts to fix the first supporting seat.

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