CN219708629U - Paper feeding device and bar code printer - Google Patents

Abstract

The utility model discloses a paper feeding device and discloses a bar code printer with the paper feeding device. The paper outlet roller is used for storing the master paper, the rubber roll is used for traction of the master paper, the base paper winding is used for winding the base paper, guide rollers are arranged at two ends of the rotating frame, the two guide rollers can be used for the master paper to be wound in an S shape, the blocking roller can be abutted with the guide roller far away from the paper outlet roller, and two ends of the first elastic piece are respectively connected with the rotating frame and the frame. The master paper is pulled and moves towards the rubber roller, the master paper is tensioned and drives the rotating frame to rotate, and the first elastic piece deforms and stores force; when the master paper moves in place, the first elastic piece releases energy and resets, the rotating frame reversely rotates, the guide roller propped against the blocking roller clamps the master paper with the blocking roller, the master paper between the blocking roller and the rubber roller can be ensured to be tensioned and still, the relaxation, the shaking and the offset of the master paper are avoided, and the printing quality of bar code paper is further ensured.

Description

Paper feeding device and bar code printer

Technical Field

The utility model relates to the technical field of printing pens, in particular to a paper feeding device and a bar code printer.

Background

The paper supply of the bar code printer generally adopts a mode of dragging the master paper (comprising the base paper and the empty bar code paper) to supply paper, and outputs the printed bar code paper when dragging the master paper.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the paper feeding device which can tension the master paper to be printed and is beneficial to ensuring the printing quality of the bar code paper.

The utility model also provides a bar code printer with the paper feeding device.

According to the embodiment of the first aspect of the utility model, the paper feeding device comprises a frame, a paper outlet roller, a rubber roller, a rotating frame, a blocking roller and a base paper winding device which are all rotatably arranged on the frame, and further comprises a first elastic piece. The paper discharging roller is used for storing coiled master paper, the rubber roll is used for traction of the master paper, base paper coiling is used for coiling of the base paper, guide rollers are arranged at two ends of the rotating frame, the two guide rollers are located between the paper discharging roller and the rubber roll and are parallel to each other, the two guide rollers can supply the master paper to be in an S-shaped bypassing mode, the blocking roller can be abutted to the guide rollers far away from the paper discharging roller, two ends of the first elastic piece are connected with the rotating frame and the machine frame respectively, and the first elastic piece forces the rotating frame to rotate so that the guide rollers can press the master paper on the blocking roller.

Has at least the following beneficial effects: the master paper is pulled and moves towards the rubber roller, the master paper is tensioned and drives the rotating frame to rotate, so that the planes of the two guide rollers tend to be parallel to the planes of the paper outlet roller and the rubber roller, at the moment, the first elastic piece deforms and stores force, and the paper outlet roller starts to release the master paper; after the master paper moves in place, the first elastic piece releases energy and resets, so that the guide roller far away from the paper outlet roller abuts against the stop roller, the paper outlet roller can further release the master paper in the process, the guide roller abutting against the stop roller and the stop roller clamp the master paper, the master paper between the stop roller and the rubber roller can be kept tensioned and static, the master paper is prevented from loosening, shaking and shifting, and the printing quality of bar code paper is further guaranteed.

According to some embodiments of the utility model, one end of the paper outlet roller is rotatably connected with the frame and is provided with a baffle ring, the paper outlet roller is provided with a second elastic piece and a sliding plate capable of sliding along the length direction of the paper outlet roller, the sliding plate is provided with a plurality of pushing plates, and the second elastic piece forces the sliding plate to move towards the baffle ring, so that the pushing plates can limit the coiled mother paper on the baffle ring.

According to some embodiments of the utility model, the paper discharging roller comprises a plurality of arc plates which are enclosed into a ring shape, all the arc plates enclose into a cylindrical cavity, an avoidance hole is formed between every two adjacent arc plates, the sliding plate is arranged in the cavity, the push plate extends out of the paper discharging roller through the avoidance hole, one end of each arc plate is rotatably connected with the frame through a first rotating shaft, the baffle ring is arranged on one end of each arc plate, a detachable end cover is arranged on the other end of each arc plate, and the second elastic piece is arranged between the end cover and the sliding plate.

According to some embodiments of the utility model, the paper discharging roller is tubular, the sliding plate is annular, the sliding plate is sleeved on the paper discharging roller, a detachable end cover is arranged at the other end of the paper discharging roller, the second elastic piece is sleeved on the paper discharging roller, and the second elastic piece is arranged between the end cover and the sliding plate.

According to some embodiments of the utility model, the rotating frame comprises a second rotating shaft and two connecting plates parallel to each other, the second rotating shaft is parallel to the paper outlet roller, one end of the second rotating shaft is rotatably connected with the frame, the other end of the second rotating shaft is connected with the middle section of one connecting plate and is perpendicular to the second rotating shaft, one end of each guide roller is rotatably connected with two ends of one connecting plate, and the other end of each guide roller is rotatably connected with two ends of the other connecting plate.

According to some embodiments of the utility model, the first elastic member is a torsion spring sleeved on the second rotating shaft, and two ends of the torsion spring are respectively connected with the rotating frame and the frame.

According to some embodiments of the utility model, two ends of the torsion spring are respectively provided with a hook part, the rack is provided with a hook groove in a region close to the second rotating shaft, and the two hook parts are respectively hooked on one connecting plate and the groove wall of the hook groove.

According to some embodiments of the utility model, the frame is provided with an arc-shaped guide rail in a region between the paper outlet roller and the rubber roller, a circle center of the guide rail coincides with a rotation center of the rotating frame, one end of the blocking roller is rotatably connected with a sliding seat, and the sliding seat is slidably connected with the guide rail to adjust the position of the sliding seat on the guide rail.

According to some embodiments of the utility model, the cross section of the guide rail is T-shaped, the sliding seat is provided with a T-shaped groove matched with the guide rail, the sliding seat is connected with a fastener in a threaded manner, and the end of the fastener can be abutted against the outer side surface of the guide rail so as to fix the sliding seat on the guide rail.

A bar code printer according to an embodiment of the second aspect of the present utility model includes the paper feeding device according to the embodiment of the first aspect of the present utility model.

Has at least the following beneficial effects:

the bar code printer has all the advantages brought by the paper feeding device in the above embodiment, and the repeated description is omitted here.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram of a paper feeding apparatus according to an embodiment of the present utility model;

FIG. 2 is an enlarged schematic view of a portion of FIG. 1 at A;

FIG. 3 is a schematic diagram of a paper feeding device according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a paper output roller of a paper feeding apparatus according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a paper output roller of a paper feeding device according to another embodiment of the present utility model;

reference numerals: the machine frame 100, the guide rail 110, the sliding seat 120, the T-shaped groove 121, the fastening piece 122, the guide roller 130, the paper outlet roller 200, the baffle ring 210, the sliding plate 220, the push plate 221, the arc plate 230, the avoiding hole 240, the end cover 250, the second elastic piece 260, the rubber roller 300, the rotating frame 400, the guide roller 410, the connecting plate 420, the second rotating shaft 430, the baffle roller 500 and the base paper winding 600.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, plural means two or more. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1 to 3, the present utility model discloses a paper feeding device, which comprises a frame 100, a paper discharging roller 200, a rubber roller 300, a rotating frame 400, a blocking roller 500, a base paper winding 600 and a first elastic member, wherein the paper discharging roller 200, the rubber roller 300, the rotating frame 400, the blocking roller 500 and the base paper winding 600 are all rotatably arranged on the frame 100. The paper output roller 200 is used for storing coiled master paper, the rubber roll 300 is used for drawing the master paper, the base paper coiling 600 is used for coiling the base paper, guide rollers 410 are arranged at two ends of the rotating frame 400, two guide rollers 410 are arranged between the paper output roller 200 and the rubber roll 300 and are parallel to each other, the two guide rollers 410 can be used for supplying the master paper to bypass in an S shape, the baffle roller 500 can be abutted with the guide rollers 410 far away from the paper output roller 200, two ends of a first elastic piece are respectively connected with the rotating frame 400 and the frame 100, and the first elastic piece forces the rotating frame 400 to rotate so that the guide rollers 410 press the master paper on the baffle roller 500.

Referring to fig. 3, when the paper feeding device is in operation, a rolled master paper is first sleeved on the paper outlet roller 200, the end of the master paper is S-shaped and bypasses two guide rollers 410, the master paper passes through the space between the guide rollers 410 far away from the stop roller 500 and the paper outlet roller 200, then the master paper bypasses the rubber roller 300, the bar code paper is glass on the base paper, and finally the base paper is wound on the base paper winding 600. It can be known that, because the printing mechanism and the bar code paper stripping mechanism are arranged near the rubber roller 300, the printing mechanism prints the required content on the bar code paper on the mother paper before the mother paper bypasses the rubber roller 300, the content comprises information such as characters, letters, symbols, logos, graphics and the like, when the mother paper bypasses the rubber roller 300, the bar code paper stripping mechanism strips the printed bar code paper from the bottom paper, and after the bar code paper is taken out, the rest of the bottom paper is wound on the bottom paper winding 600.

The master paper is pulled and moves towards the rubber roll 300, the master paper is tensioned and drives the rotating frame 400 to rotate, the guide rollers 410 far away from the paper outlet roll 200 are far away from the baffle roller 500, so that the planes of the two guide rollers 410 tend to be parallel to the planes of the paper outlet roll 200 and the rubber roll 300, at the moment, the first elastic piece deforms and stores force, and the paper outlet roll 200 starts to release the master paper; when the master paper moves in place, the first elastic element releases energy and resets, the rotating frame 400 reversely rotates, so that the guide roller 410 far away from the paper outlet roller 200 is propped against the stop roller 500, the process can further release the master paper, the guide roller 410 propped against the stop roller 500 clamps the master paper with the stop roller 500, the master paper between the stop roller 500 and the rubber roller 300 can be ensured to be tensioned and still, the loosening, shaking and offset of the master paper are avoided, and the printing quality of bar code paper is further ensured.

Referring to fig. 3, the blocking roller 500 is disposed below the right side of the glue roller 300, the rotating frame 400 is disposed above the right side of the blocking roller 500, the upper ends of the planes of the two guide rollers 410 are inclined to the right, the guide roller 130 is disposed below the right side of the rotating frame 400, the base paper winding 600 is disposed below between the rotating frame 400 and the guide roller 130, and the paper discharging roller 200 is disposed above the right side of the guide roller 130. The end of the mother paper is released from below the discharge roller 200, then is bypassed from below the guide roller 130, and then is bypassed from above the guide roller 410 near the discharge roller 200.

It should be understood that the frame 100 is provided with a rotary driving mechanism, and the rotary driving mechanism is in transmission connection with the rubber roll 300 and the base paper winding 600, and the rotary driving mechanism drives the rubber roll 300 and the base paper winding 600. When the number of the rotary driving mechanisms is two, the two rotary driving mechanisms are respectively in transmission connection with the rubber roller 300 and the base paper winding 600, and when the number of the rotary driving mechanisms is one, the rubber roller 300 and the base paper winding 600 are in transmission connection with the same rotary driving mechanism.

Referring to fig. 4, one end of the discharge roller 200 is rotatably coupled to the frame 100 such that the discharge roller 200 is freely rotatable on the frame 100. One end of the paper discharging roller 200 is provided with a baffle ring 210, the paper discharging roller 200 is provided with a sliding plate 220 and a second elastic piece 260, the sliding plate 220 is provided with a plurality of pushing plates 221, the second elastic piece 260 forces the sliding plate 220 to move towards the baffle ring 210, the sliding plate 220 carries the pushing plates 221 to move towards the baffle ring 210, and when the coiled master paper is sleeved on the paper discharging roller 200, the pushing plates 221 can push the coiled master paper onto the baffle ring 210, so that the coiled master paper is limited on the baffle ring 210, namely the paper discharging roller 200.

The paper discharge roller 200 includes a plurality of arc plates 230 that are formed in a ring shape, all the arc plates 230 form a cylindrical chamber, and the rolled parent paper can be sleeved on all the arc plates 230. One end of the arc plate 230 is rotatably coupled to the housing 100 through a first shaft 270, and the blocking ring 210 is provided on one end of the arc plate 230. An avoidance hole 240 is formed between two adjacent arc plates 230, the sliding plate 220 is arranged in the cavity, the sliding plate 220 is limited in the cavity and can slide along the length direction of the cavity/arc plates 230, namely slide along the length direction of the paper outlet roller 200, and the push plate 221 extends out of the paper outlet roller 200 through the avoidance hole 240, so that the push plate 221 can be arranged at one end of the mother paper far away from the baffle ring 210, and the mother paper is pushed to move towards the baffle ring 210.

The other end of the arc plate 230 is provided with a detachable end cover 250, and a second elastic member 260 is arranged between the end cover 250 and the slide plate 220, and when the second elastic member 260 is in an extended state, one end of the second elastic member 260 acts on the end cover 250, and the other end of the second elastic member 260 acts on the end cover 250/the push plate 221.

It will be appreciated that end cap 250 is threadably coupled to arcuate plate 230. The two ends of the second elastic member 260 are respectively connected to the sliding plate 220 and the end cover 250, and when the end cover 250 is disassembled, the second elastic member 260 and the sliding plate 220 can be taken down from the arc plate 230 together through the end cover 250; the paper discharge roller 200 stores the rolled mother paper, the rolled mother paper is first sleeved on the arc plate 230, then the push plate 221 is aligned with the avoidance hole 240, then the sliding plate 220 and the second elastic member 260 are inserted into the chamber at one time, and finally the end cover 250 is screwed on the arc plate 230. The second elastic member 260 is a spring.

Referring to fig. 5, in another embodiment, the paper discharging roller 200 is tubular, the sliding plate 220 is annular, the sliding plate 220 is sleeved on the paper discharging roller 200, a detachable end cover 250 is arranged at the other end of the paper discharging roller 200, the second elastic member 260 is sleeved on the paper discharging roller 200, and the second elastic member 260 is arranged between the end cover 250 and the sliding plate 220, when the second elastic member 260 is in an extended state, one end of the second elastic member 260 acts on the end cover 250, and the other end of the second elastic member 260 acts on the end cover 250/push plate 221.

It should be appreciated that the second resilient member 260 has opposite ends that respectively bear against the slide plate 220 and the end cap 250. The second elastic member 260 is a spring. After the cover 250, the second elastic member 260 and the slider 220 are sequentially removed, the rolled master paper is sleeved on the paper discharge roller 200, the slider 220, the second elastic member 260 and the cover 250 are sleeved on the paper discharge roller 200 at one time, and finally the cover 250 is screwed on the paper discharge roller 200. The second elastic member 260 is a spring. The second elastic member 260 can connect the sliding plate 220 and the cover 250 together by adopting two sections of connection modes respectively with the sliding plate 220 and the cover 250, so that the paper discharge roller 200 can conveniently and rapidly store the mother paper.

Referring to fig. 1 to 3, the rotating frame 400 includes a second rotating shaft 430 and two link plates 420 parallel to each other, the second rotating shaft 430 is parallel to the paper discharge roller 200, one end of the second rotating shaft 430 is rotatably connected with the frame 100, the other end of the second rotating shaft 430 is connected with the middle section of one link plate 420 and is perpendicular to the second rotating shaft 430, one ends of two guide rollers 410 are rotatably connected with both ends of one link plate 420, and the other ends of two guide rollers 410 are rotatably connected with both ends of the other link plate 420.

The two connecting plates 420 and the two guide rollers 410 form a square frame structure, and since one end of the second rotating shaft 430 is rotatably connected with the frame 100 and the other end of the second rotating shaft 430 is connected with the middle section of one connecting plate 420 and is perpendicular to the second rotating shaft 430, the square frame structure can rotate on the frame 100, so that the guide roller 410 far away from the paper outlet roller 200 is far away from or is abutted against the stop roller 500.

The first elastic member is a torsion spring sleeved on the second rotating shaft 430, two ends of the torsion spring are respectively connected with the rotating frame 400 and the frame 100, and when the rotating frame 400 rotates, the guide roller 410 far away from the paper discharging roller 200 is far away from the blocking roller 500, the force of the torsion spring is accumulated; when the torsion spring releases the energy, the torsion spring forces the turret 400 to rotate in the opposite direction, so that the guide roller 410, which is far from the discharge roller 200, approaches and abuts against the stopper roller 500.

The two ends of the torsion spring are both provided with hook parts, the frame 100 is provided with a hook groove in the area close to the second rotating shaft 430, the two hook parts are respectively hooked on the connecting plate 420 and the groove wall of the hook groove, the two hook parts can enable the installation of the torsion spring to be firmer, the torsion spring is prevented from being separated from the connecting plate 420 and the frame 100, and therefore the torsion spring failure caused by the problem of the installation of the torsion spring is avoided.

According to different requirements, the widths of the bar code paper are different, after one bar code paper is printed, the moving distances of different master papers are different, the larger the moving distance of the master paper is, the larger the rotating angle of the rotating frame 400 is, the larger the deformation of the first elastic piece is, but the larger the deformation of the first elastic piece is, the larger the acting force of the guide roller 410 on the master paper is, and the tensioning degree of the master paper is also. According to the different widths of the mother paper and the demands of the tightness of the mother paper, the tilting state of the turret 400, that is, the initial position of the stopper 500, needs to be adjusted.

Referring to fig. 2, the frame 100 is provided with an arc-shaped guide rail 110 in a region between the paper discharge roller 200 and the glue roller 300, a center of the guide rail 110 coincides with a rotation center of the turret 400, one end of the stopper 500 is rotatably connected with a slider 120, and the slider 120 is slidably connected with the guide rail 110 to adjust a position of the slider 120 in the guide rail 110. The guide rail 110 and the slide base 120 realize the adjustment of the position of the stop roller 500, and the circle center of the guide rail 110 coincides with the rotation center of the rotating frame 400, so that the track of the stop roller 500 is always parallel to the track of the guide roller 410 far away from the paper discharge roller 200, and the guide roller 410 far away from the paper discharge roller 200 always abuts against the stop roller 500. Adjusting the position of the slide 120 on the guide rail 110 finally achieves an adjustment of the inclination of the two guide rollers 410 sitting on the plane/turret 400.

The cross section of the guide rail 110 is T-shaped, and the slide base 120 is provided with a T-shaped groove 121 matched with the guide rail 110, so that the slide base 120 can be prevented from being separated from the guide rail 110 along the vertical direction of the guide rail 110. It can be appreciated that the frame 100 is provided with detachable limiting blocks at positions corresponding to two ends of the guide rail 110, and the limiting blocks block the sliding seat 120, so that the sliding seat 120 can be prevented from being separated from the guide rail 110 along the directions of two ends of the guide rail 110.

The slide 120 is screwed with a fastener 122, and the end of the fastener 122 can abut against the outer side surface of the guide rail 110 to fix the slide 120 on the guide rail 110.

The utility model discloses a bar code printer which comprises the paper feeding device, a printing mechanism, a bar code paper stripping mechanism, a carbon tape winding and unwinding mechanism, a driving rubber roller 300/base paper winding 600 rotary driving mechanism, a casing and other common bar code printer mechanisms. Since common bar code printer mechanisms are known, redundant description is not made here.

The bar code printer has all the advantages brought by the paper feeding device in the above embodiment, and the repeated description is omitted here.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

Of course, the present utility model is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present utility model, and these equivalent modifications or substitutions are included in the scope of the present utility model as defined in the appended claims.

Claims (10)

1. The paper feed device is characterized by comprising:

the machine frame is provided with a paper outlet roller and a rubber roller which can rotate, wherein the paper outlet roller is used for storing coiled master paper, and the rubber roller is used for dragging the master paper;

the rotating frame is rotatably arranged on the frame, guide rollers are arranged at two ends of the rotating frame, two guide rollers are arranged between the paper outlet roller and the rubber roller and are parallel to each other, and the two guide rollers can be used for enabling the mother paper to bypass in an S shape;

the blocking rod is rotatably arranged on the stand and can be abutted with the guide roller far away from the paper outlet roller;

the two ends of the first elastic piece are respectively connected with the rotating frame and the machine frame, and the first elastic piece forces the rotating frame to rotate so that the guide roller presses the master paper on the blocking roller;

the base paper winding is rotatably arranged on the frame and used for winding the base paper.

2. The paper feeding apparatus according to claim 1, wherein: one end of the paper outlet roller is rotatably connected with the frame and is provided with a baffle ring, the paper outlet roller is provided with a second elastic piece and a sliding plate capable of sliding along the length direction of the paper outlet roller, the sliding plate is provided with a plurality of pushing plates, and the second elastic piece forces the sliding plate to move towards the baffle ring, so that the pushing plates can limit the coiled master paper on the baffle ring.

3. The paper feeding apparatus according to claim 2, wherein: the paper discharge roller comprises a plurality of arc plates which are surrounded to form a ring shape, all the arc plates are surrounded to form a cylindrical cavity, an avoidance hole is formed between every two adjacent arc plates, the sliding plate is arranged in the cavity, the push plate extends to the outside of the paper discharge roller through the avoidance hole, one end of each arc plate is rotatably connected with the frame through a first rotating shaft, the baffle ring is arranged on one end of each arc plate, a detachable end cover is arranged at the other end of each arc plate, and the second elastic piece is arranged between the end cover and the sliding plate.

4. The paper feeding apparatus according to claim 2, wherein: the paper discharging roller is tubular, the sliding plate is annular, the sliding plate is sleeved on the paper discharging roller, a detachable end cover is arranged at the other end of the paper discharging roller, the second elastic piece is sleeved on the paper discharging roller, and the second elastic piece is arranged between the end cover and the sliding plate.

5. The paper feeding apparatus according to claim 1, wherein: the rotating frame comprises a second rotating shaft and two connecting plates which are parallel to each other, the second rotating shaft is parallel to the paper outlet roller, one end of the second rotating shaft is rotatably connected with the frame, the other end of the second rotating shaft is connected with the middle section of the connecting plate and is mutually perpendicular to the second rotating shaft, one ends of the two guide rollers are respectively rotatably connected with two ends of the connecting plate, and the other ends of the two guide rollers are respectively rotatably connected with the other ends of the connecting plate.

6. The paper feeding apparatus according to claim 5, wherein: the first elastic piece is a torsion spring sleeved on the second rotating shaft, and two ends of the torsion spring are respectively connected with the rotating frame and the frame.

7. The paper feeding apparatus according to claim 6, wherein: the two ends of the torsion spring are respectively provided with a hook part, the rack is provided with a hook groove in a region close to the second rotating shaft, and the two hook parts are respectively hooked on the groove walls of the connecting plate and the hook groove.

8. The paper feeding apparatus according to claim 1, wherein: the machine frame is provided with an arc-shaped guide rail in the area between the paper outlet roller and the rubber roller, the circle center of the guide rail coincides with the rotation center of the rotating frame, one end of the blocking rod is rotatably connected with a sliding seat, and the sliding seat is slidably connected with the guide rail to adjust the position of the sliding seat on the guide rail.

9. The paper feeding apparatus according to claim 8, wherein: the cross section of guide rail is T-shaped, be equipped with on the slide with guide rail matched with T-shaped groove, threaded connection has the fastener on the slide, the end of fastener can support the lateral surface of guide rail in order to fix the slide on the guide rail.

10. Bar code printer, its characterized in that: paper feeding device according to any of the preceding claims 1 to 9.