CN213082624U

CN213082624U - Printer with a movable platen

Info

Publication number: CN213082624U
Application number: CN202021339033.6U
Authority: CN
Inventors: 王治国; 李芳�
Original assignee: HENAN WODAFENG DIGITAL TECHNOLOGY CO LTD
Current assignee: HENAN WODAFENG DIGITAL TECHNOLOGY CO LTD
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2021-04-30
Anticipated expiration: 2030-07-09

Abstract

The utility model relates to a printer. The printer comprises a base, a rubber roller rotatably mounted on the base, and a thermal printing head arranged above the rubber roller, wherein the thermal printing head is rotatably mounted on the base around a left-right extending axis; the rotation stroke of the thermal printing head is provided with an upper avoidance position and a lower printing position; the printer also comprises a guide roller assembly arranged on the base, wherein the guide roller assembly comprises driven guide rollers and driving guide rollers which are sequentially arranged at intervals from top to bottom, the driven guide rollers and the driving guide rollers are arranged in two rows at intervals along the left-right direction, and the driven guide rollers and the driving guide rollers can be rotationally arranged around axes extending from left to right; the guide roller assembly comprises a guide roller mounting frame which is movably assembled on the base along the up-down direction, driven guide rollers on each side are correspondingly and rotatably mounted on the guide roller mounting frame on the corresponding side, and the driven guide rollers have upper limit positions and lower limit positions along with the moving stroke of the guide roller mounting frame; the printer also comprises a driving mechanism, and the driving mechanism is used for driving each driving guide roller and the rubber roller to synchronously rotate.

Description

Printer with a movable platen

Technical Field

The utility model relates to a printer.

Background

The screen printing plate includes screen frame and screen fixed in the screen frame, and in the existent screen printing process, a photosensitive photoengraving plate is mostly used, and a positive film carrying image or letter is placed on the screen coated with photosensitive emulsion, and the photosensitive emulsion can be hardened after being irradiated by light, and irradiated by strong light, and the portion of screen which is not covered by positive film is hardened, and the portion which is covered by positive film and is not irradiated is not hardened. The uncured emulsion is then washed away to reveal the image or letter transferred from the positive to the screen. However, the photosensitive photoengraving mode has more production processes and is more complex.

Chinese utility model patent No. CN203305636U discloses a thermal sensitive screen printing plate, which prints out the required image on a thermal sensitive screen by a thermal sensitive printer, and then tightens and fixes the printed screen on a screen frame to form the screen printing plate. The thermal printer works on the principle that an image is formed on a thermal medium (such as a thermal screen in the patent) by using a hot spot generated by a thermal printing head, and a two-dimensional image can be finally formed by the relative movement of the thermal printing head and the thermal medium. The thermal printer further includes a rubber roller facing the thermal head for pressing the thermal medium against the thermal head so that heat generated from the thermal head can flow into the medium to form an image.

In the prior art, a required pattern can be printed on a thermal sensitive screen through a thermal printer, and compared with a photosensitive photoengraving mode, the method has the advantages of fewer processes and simplicity in manufacturing. Because the prior thermal printer can not print the screen printing plate with the screen frame, in the prior art, the screen is printed firstly, and then the screen is tightened and fixed on the screen frame, so that unexpected conditions such as image deformation and the like can occur in the tightening process, and images can not be accurately displayed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a printer to solve among the prior art thermal printer can't print the half tone that has the screen frame and lead to the technical problem that the image easily takes place to warp.

In order to achieve the above object, the utility model discloses screen printer's technical scheme is: a printer, comprising:

a base;

the rubber roller is rotatably arranged on the base and defines the extending direction of the rotating axis of the rubber roller as the left and right directions;

the thermal printing head is arranged above the rubber roller and is matched with the rubber roller to perform thermal printing on a silk screen in the screen printing plate, and the thermal printing head is rotatably arranged on the base around a left-right extending axis; the rotation stroke of the thermal printing head is provided with an upper avoidance position and a lower printing position, a channel for the screen plate to be placed between the thermal printing head and the rubber roller in the front-back direction is formed between the thermal printing head and the rubber roller when the thermal printing head is positioned at the upper avoidance position, and the thermal printing head and the rubber roller are matched to print a silk screen when the thermal printing head is positioned at the lower printing position;

the guide roller assembly is arranged on the base and used for driving the screen printing plate to move along the front-back direction so as to print the silk screen, the guide roller assembly comprises driven guide rollers and driving guide rollers which are sequentially arranged at intervals from top to bottom, the driven guide rollers and the driving guide rollers are arranged in two rows at intervals along the left-right direction, and the driven guide rollers and the driving guide rollers can be rotationally arranged around axes extending from left to right; the driving guide roller and the driven guide roller are arranged on the left side and the right side of the thermal printing head and the rubber roller;

the guide roller assembly comprises a guide roller mounting frame which is movably assembled on the base along the up-down direction, driven guide rollers on each side are correspondingly and rotatably mounted on the guide roller mounting frame on the corresponding side, the driven guide rollers have upper limit positions and lower limit positions along with the moving stroke of the guide roller mounting frame, a channel for a screen frame in the screen printing plate to pass through back and forth is formed between the driven guide rollers and the driving guide rollers when the driven guide rollers are at the upper limit positions, and the driven guide rollers and the driving guide rollers are matched with each other to clamp the screen frame when the driven guide rollers;

the printer also comprises a driving mechanism, and the driving mechanism is used for driving each driving guide roller and the rubber roller to synchronously rotate so as to drive the silk screen and the screen frame in the screen printing plate to synchronously move back and forth.

The utility model has the advantages that: a channel can be formed between the thermal printing head and the rubber roller and between the driven guide roller and the driving guide roller by rotating the thermal printing head and moving the driven guide roller upwards, so that the screen printing plate is put in along the front-back direction, after the screen printing plate is put in, a silk screen in the screen printing plate is positioned between the thermal printing head and the rubber roller, and the side edges of the screen frame of the screen printing plate in the left-right direction are positioned between the driven guide roller and the driving guide roller. When the thermal printing device is used, the thermal printing head is matched with the rubber roller to print a silk screen, the driven guide roller is matched with the driving guide roller to clamp the screen frame, and the driving mechanism drives the driving guide roller and the rubber roller to synchronously rotate, so that the screen frame and the silk screen can synchronously move, and the silk screen is prevented from being torn due to displacement difference. The utility model discloses in, realize the transport and the printing to the half tone that has the screen frame with rotatable thermal printing head and mobilizable driven deflector roll, can tighten the silk screen earlier during printing, carry out the half tone again and print, do not need follow-up silk screen that tightens again, prevent that the pattern on the silk screen from warping. The utility model discloses in, through arranging initiative deflector roll, rubber roll and actuating mechanism in the below, make the printer whole go up the bottom heavy, upper portion light, more stable during the use. And the driving guide roller and the rubber roller are positioned on the same side of the screen printing plate, so that centralized driving is convenient to carry out.

As a further optimized scheme, the base comprises a top plate, the guide roller assembly further comprises a pull rod, the lower end of the pull rod is connected with the guide roller mounting frame, the upper end of the pull rod penetrates through the top plate, and the driven guide roller can move back and forth between an upper limit position and a lower limit position through the up-and-down movement of the pull rod;

the guide roller assembly includes a retaining structure for locking the pull rod to the top plate when the guide roller mount is in the upper limit position.

The effect of this scheme lies in, sets up the pull rod after, can realize the position maintenance of deflector roll mounting bracket through the cooperation of pull rod and roof, and it is more convenient to use.

As a further preferred solution, the holding structure comprises a spring provided between the top plate and the idler roller mounting bracket, the spring being adapted to apply a downward resilient force to the idler roller mounting bracket to hold the driven idler roller in the lower limit position.

The effect of this scheme lies in, sets up the spring after, when driven deflector roll is in lower extreme position, can exert the elastic force that lasts to driven deflector roll, guarantees that driven deflector roll can press the screen frame to initiative deflector roll, guarantees that main, driven deflector roll can cooperate the centre gripping screen frame.

As a further optimized scheme, the holding structure further comprises a guide rod fixedly arranged on one of the top plate and the guide roller mounting frame, one end of the guide rod penetrates through the other one of the top plate and the guide roller mounting frame, and the spring is sleeved outside the guide rod.

The effect of this scheme lies in, through setting up the guide arm, can lead the removal of deflector roll mounting bracket on the one hand, and on the other hand also prevents that the spring from taking place the beat.

As a further optimized scheme, the pull rod is rotatably assembled with the guide roller mounting frame;

the retaining structure comprises a stop pin which penetrates through the pull rod along the radial direction of the pull rod, a long hole through which the stop pin penetrates up and down is formed in the top plate, and the stop pin can be matched with the top plate in a stopping mode by rotating the pull rod after the stop pin penetrates through the long hole upwards.

The effect of this scheme lies in, can the time backing round pin and roof block cooperation and arrange driven deflector roll in upper limit position after rotating the pull rod, and it is more convenient to use.

As a further optimized scheme, the base comprises a bottom plate, two side plates arranged on the bottom plate at intervals left and right, and a top plate arranged on the side plates, wherein the bottom plate, the top plate and the two side plates form a closed frame;

the base further comprises two vertical mounting plates arranged on the lower side of the bottom plate, the two vertical mounting plates are arranged at intervals in the left-right direction, a rotating shaft extending left and right is rotatably mounted on the two vertical mounting plates, and the thermal printing head is fixedly arranged on the rotating shaft;

and a motor for driving the rotating shaft to rotate is further arranged on one vertical mounting plate.

As a further optimized scheme, the driving mechanism comprises a driving motor, an output shaft of the driving motor is in transmission connection with a synchronous transmission mechanism, and the synchronous transmission mechanism is in transmission connection with each driving guide roller and each rubber roller.

The effect of this scheme lies in, sets up a driving motor and supporting synchronous drive mechanism, can save driving motor's quantity, practices thrift the cost.

As a further optimized scheme, the synchronous transmission mechanism comprises a synchronous rotating shaft which is rotatably arranged on the base, and the synchronous rotating shaft is connected with each driving guide roller and the rubber roller through a transmission belt so as to drive each driving guide roller and the rubber roller to rotate synchronously.

The effect of this scheme lies in, can concentrate each initiative deflector roll and rubber roll through setting up synchronous pivot and carry out the transmission, arranges the form comparatively simply.

As a further optimized scheme, the driving mechanism further comprises a tension wheel, and the tension wheel is used for jacking and pressing the transmission belt to tension the transmission belt;

the tensioning wheels are adjustably arranged on the base along the direction close to and far away from the corresponding transmission belts;

the driving mechanism further comprises an adjusting part used for adjusting the position of the tension wheel, the adjusting part is used for jacking the tension wheel towards the direction where the corresponding transmission belt is located, the adjusting part is rotatably or movably arranged on the base, and the adjusting part and the corresponding transmission belt are respectively arranged on two sides of the tension wheel.

The effect of this scheme lies in, through setting up take-up pulley and regulating part, can change the tensioning degree of drive belt, prevents that the drive belt pine from taking off, is convenient for adjust in order to realize the synchronization of initiative deflector roll and rubber roll moreover.

As a further optimized scheme, at least two driving guide rollers and at least two driven guide rollers are arranged in each row in the left-right direction, and each driven guide roller in each row is arranged on the same guide roller mounting frame.

The effect of this scheme lies in, through setting up two at least driven deflector rolls at every row, can improve the stability of screen frame transportation in-process.

Drawings

Fig. 1 is a schematic view of a printer according to an embodiment 1 of the present invention when printing a screen;

FIG. 2 is a perspective view of embodiment 1 of the printer of the present invention (with the outer plate removed for clarity);

fig. 3 is a front view of the printer of embodiment 1 of the present invention;

FIG. 4 is a schematic view showing the assembly positions of the driving mechanism, the driving guide roller and the rubber roller in embodiment 1 of the printer of the present invention;

FIG. 5 is a schematic view of FIG. 4 with the glue roller removed;

FIG. 6 is a schematic view of FIG. 4 showing a second tensioner;

FIG. 7 is a schematic view of a thermal printhead assembly and a driven guide roller in example 1 of a printer according to the present invention;

fig. 8 is a perspective view of a driven guide roller, a guide roller mounting bracket, and a pull rod according to embodiment 1 of the printer of the present invention;

fig. 9 is a side view of the driven guide roller, the guide roller mounting frame, and the pull rod in embodiment 1 of the printer of the present invention;

FIG. 10 is a schematic view of the tie rod of FIGS. 8 and 9;

fig. 11 is a top view of the driven guide roller, the guide roller mounting frame, and the pull rod of the printer of embodiment 1 of the present invention (only one handle is shown for clarity);

FIG. 12 is a schematic view of a thermal printhead assembly according to example 1 of the present invention;

description of reference numerals: 100-a base; 200-screen printing plate; 300-a thermal printhead assembly; 400-rubber roller; 500-a guide roller assembly; 600-a drive mechanism; 11-a base plate; 12-side plates; 13-a top plate; 14-a first riser; 15-a second riser; 16-a vertical mounting plate; 17-a long hole; 21-a screen frame; 22-a wire mesh; 31-a thermal print head; 32-a first motor; 33-a rotating shaft; 34-a drive gear; 35-a driven gear; 51-driven guide rollers; 52-driving guide rollers; 53-guide roller mounting; 54-an escape channel; 55-a pull rod; 551-stop pin perforation; 56-a guide rod; 57-a spring; 58-a handle; 59-stop pin; 61-a second motor; 62-synchronous rotating shaft; 63-a first drive belt; 64-a second drive belt; 65-a third drive belt; 66-a fourth drive belt; 67-first tensioning wheel; 68-a synchronization rod; 69-a second tensioning wheel; and 610-adjusting angle steel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the present invention are described in further detail below with reference to examples.

The utility model discloses a specific embodiment 1 of printer:

as shown in fig. 1 to 12, the printer is a thermal printer, and prints a desired image on the screen 22 of the screen plate 200. The printer comprises a base 100, a thermal printing head assembly 300 and a rubber roller 400 are sequentially arranged on the base 100 along the up-down direction, and a thermal printing head 31 in the thermal printing head assembly 300 is matched with the rubber roller 400 for printing. The printer further comprises a guide roller assembly 500, wherein the guide roller assembly 500 comprises a driven guide roller 51 and a driving guide roller 52, and the frame 21 in the screen plate 200 can be driven to move back and forth by the cooperation of the driven guide roller 51 and the driving guide roller 52. The glue roller 400, in use, contacts the screen 22 and actively rotates to drive movement of the screen 22. The printer further comprises a driving mechanism 600, wherein the driving mechanism 600 can drive the driving guide roller 52 and the rubber roller 400 to synchronously rotate, so that the silk screen 22 and the screen frame 21 in the screen plate 200 can be ensured to simultaneously move, and the displacement difference is avoided.

As shown in fig. 2, the base 100 includes a bottom plate 11, side plates 12 fixed to both sides of the bottom plate 11, the side plates 12 extending up and down, the two side plates 12 arranged at intervals in the left-right direction, and a top plate 13 fixed to the tops of the two side plates 12. The bottom plate 11, the top plate 13 and the two side plates 12 form a closed frame. As shown in fig. 3, two vertical mounting plates 16 are fixed on the inner side of the top plate 13 facing the bottom plate 11, the two vertical mounting plates 16 are arranged at left and right intervals, and the two vertical mounting plates 16 extend downward from the top plate 13. The thermal print head assembly 300 is mounted on the two vertical mounting plates 16, the structure of the thermal print head assembly 300 is shown in fig. 12, the thermal print head assembly 300 includes a thermal print head 31, the thermal print head 31 is a prior art, a commercially available thermal print head can be selected, a rotating shaft 33 is fixed on the thermal print head 31, the rotating shaft 33 extends left and right, and two ends are rotatably mounted on the respective corresponding vertical mounting plates 16. A first motor 32 is fixedly mounted on the inner side of one of the vertical mounting plates 16, and a motor output shaft of the first motor 32 is arranged side by side with the rotating shaft 33. The motor output shaft of first motor 32 runs through vertical mounting panel 16, installs driving gear 34 on the motor output shaft, and the one end of pivot 33 is worn out in vertical mounting panel 16, and fixed mounting has driven gear 35 on the pivot 33, and driving gear 34 and driven gear 35 mesh drive pivot 33 through first motor 32 and rotate, and then drive thermal print head 31 and rotate. In this embodiment, the rotating shaft 33 is located at an edge of one side of the thermal print head 31, and after the thermal print head 31 rotates, a channel can be formed between the thermal print head 31 and the rubber roller 400, so that the screen frame 21 is placed between the thermal print head 31 and the rubber roller 400 in the front-back direction. In other embodiments, the position of the rotating shaft arranged on the thermal printing head can be changed according to actual conditions.

As shown in fig. 4, two second vertical plates 15 are fixed on the bottom plate 11, the two second vertical plates 15 are arranged at intervals left and right, and the second vertical plates 15 have a certain distance from the side plate 12 on the corresponding side, and the distance is used for accommodating the driving guide roller 52. The rubber roller 400 is erected on the two second vertical plates 15, and after the rubber roller 400 is installed, the rubber roller 400 extends left and right and is located below the thermal printing head 300. Specifically, the rubber roller shaft in the rubber roller 400 is rotatably mounted on the two second vertical plates 15, and one end of the rubber roller extends to the two ends with a larger length for mounting the belt pulley.

As shown in fig. 2 and 3, the guide roller assembly 500 includes a driven guide roller 51 and a driving guide roller 52, the driven guide roller 51 is located above the driving guide roller 52, and the driven guide roller 51 and the driving guide roller 52 cooperate to clamp the frame 21 in the up-down direction and to convey the frame 21 in the front-back direction. The number of the driven guide rollers 51 and the number of the driving guide rollers 52 are the same and are in one-to-one correspondence. The driven guide rollers 51 and the driving guide rollers 52 are four and divided into a left group and a right group, and each group is provided with a front group and a rear group. The driven guide roller 51 and the driving guide roller 52 both extend in the left-right direction and can rotate around the axis extending in the left-right direction, and the driven guide roller 51 and the driving guide roller 52 have a certain width in the left-right direction and can be attached to the screen frame 21, so that the contact area with the screen frame 21 is increased. The driving guide roller 52 rotates actively to drive the screen frame 21 to move, and the driven guide roller 51 is driven by the screen frame 21 to rotate. As shown in fig. 4 and 5, two first vertical plates 14 are fixedly mounted on the bottom plate 11, the two first vertical plates 14 are arranged in the left-right direction, and the two first vertical plates 14 are located inside the two second vertical plates 15. The central shaft of the driving guide roller 52 is rotatably installed between the side plate 12 and the first vertical plate 14, and the central shaft penetrates through the second vertical plate 15.

When the screen frame 21 and the screen 22 are used, the screen frame and the screen move synchronously, and the phenomenon that the screen frame and the screen 22 are torn due to speed difference is avoided. As shown in fig. 2, 4 and 5, the printer includes a driving mechanism 600, and the driving mechanism 600 drives the driving guide roller 52 and the rubber roller 400 to rotate synchronously. The driving mechanism 600 includes a second motor 61 fixedly mounted outside the second vertical plate 15, and further includes a synchronous rotating shaft 62 erected between the two second vertical plates 15, both ends of the synchronous rotating shaft 62 are rotatably mounted on the second vertical plate 15 on the corresponding side, and the synchronous rotating shaft 62 penetrates through the first vertical plate 14. The driving guide roller 52, the rubber roller 400 and the synchronous rotating shaft 62 are connected in a belt transmission manner, and specifically, belt wheels are respectively mounted on the output shaft of the second motor 61 and the synchronous rotating shaft 62 and are transmitted through a first transmission belt 63; the synchronous rotating shaft 62 and the central shaft of one of the driving guide rollers 52 in the front-back direction are respectively provided with a belt wheel and are driven by a second transmission belt 64; the synchronous rotating shaft 62 and the central shaft of the other driving guide roller 52 in the front-back direction are respectively provided with a belt wheel and are driven by a third driving belt 65; the synchronous rotating shaft 62 and the rubber roller shaft of the rubber roller 400 are respectively provided with a belt wheel and are driven by a fourth driving belt 66. The transmission between the synchronous rotating shaft 62 and the two driving guide rollers 52 on each side in the left-right direction is realized through a second transmission belt 64 and a third transmission belt 65. When the rubber roller device is used, the second motor 61 rotates, and the four driving guide rollers 52 and the rubber roller 400 can be driven to synchronously rotate by driving the synchronous rotating shaft 62 to rotate.

As shown in fig. 4, to tension the second belt 64, a first tensioning wheel 67 is mounted on the first riser 14, and the first tensioning wheel 67 bears against the outer side surface of the second belt 64. As shown in fig. 5 and 6, in order to tension the two third belts 65, the synchronization rods 68 are installed to span the two first risers 14, and the two second tension pulleys 69 are installed to the synchronization rods 68, each of the second tension pulleys 69 corresponding to the third belts 65 on both sides. Specifically, a long hole is opened in the first riser 14, the extending direction of the long hole is perpendicular to the third belt 65, both ends of the synchronization rod 68 pass through the long hole, and the synchronization rod 68 is movable in the extending direction of the long hole, so that the degree of compression between the second tension pulley 69 and the third belt 65 is changed, and the degree of tension of the third belt 65 is changed. As shown in fig. 6, the adjustment angle 610 is attached to the first riser 14, one edge of the adjustment angle 610 presses against the synchronization lever 68, and the second tension pulley 69 presses against the third belt 65. The adjusting angle steel 610 is rotatably installed on the first vertical plate 14, specifically, a round hole and a long hole are formed in one side of the adjusting angle steel 610, the adjusting angle steel 610 rotates around the axis of the round hole, an arc-shaped hole is formed in the position, corresponding to the long hole of the adjusting angle steel 610, of the first vertical plate 14, and the adjusting angle steel 610 is fastened through a bolt after rotating in place.

In use, the thermal print head 31 is rotated to place the screen 22 of the screen 200 between the thermal print head 31 and the blanket 400. In order to allow the screen frame 21 of the screen plate 200 to be interposed between the driven guide roller 51 and the driving guide roller 52, the driven guide roller 51 is moved up and down, as described below.

As shown in fig. 7 to 11, the printer includes two guide roller mounts 53, and the guide roller mounts 53 are distributed in the left and right direction. Two driven guide rollers 51 on each side in the left-right direction are rotatably mounted on the guide roller mounting bracket 53. Taking the guide roller mounting bracket 53 on one side as an example for explanation, a pull rod 55 is mounted on the guide roller mounting bracket 53, the structure of the pull rod 55 is shown in fig. 10, the lower end of the pull rod 55 is provided with a flange capable of being in stop fit with the guide roller mounting bracket 53, when the pull rod 55 is pulled upwards, the guide roller mounting bracket 53 can be pulled upwards, and the pull rod 55 can rotate around the axis of the guide roller mounting bracket 53 relative to the guide roller mounting bracket 53. A stopper pin through hole 551 that penetrates in the radial direction is opened at the middle position of the pull rod 55, and the stopper pin 59 is inserted into the stopper pin through hole 551 after assembly. And the two sides of the upper end of the pull rod 55 are provided with notches to form two parallel side surfaces. The upper end of the pull rod 55 protrudes upward from the top plate 13, as shown in fig. 11, a vertically through long hole 17 is formed in the top plate 13, the upper end of the pull rod 55 and the stopper pin 59 can pass through the long hole 17, and after the pull rod 55 is rotated after passing through the long hole, the stopper pin 59 can be engaged with the top plate 13 in a vertically retaining manner, so that the pull rod 55 and the guide roller mounting bracket 53 are prevented from moving downward.

As shown in fig. 8 and 9, two guide rods 56 are further fixedly mounted on the top plate 13 corresponding to each guide roller mounting bracket 53, and the two guide rods 56 are distributed on both sides of the pull rod 55. The guide rod 56 has an upper end fixed to the top plate 13 and a lower end penetrating through the guide roller mounting bracket 53, and a spring 57 is press-fitted between the top plate 13 and the guide roller mounting bracket 53, wherein the spring 57 is a compression spring. In use, the guide roller mounting bracket 53 and the driven guide roller 51 are pressed against the screen frame 21 by the spring 57, and the spring 57 is compressed when the pull rod 55 is pulled upward. For convenience of operation, a handle 58 is fixedly mounted on the pull rod 55. In other embodiments, the guide rod may be fixedly mounted on the guide roller mounting bracket with the upper end penetrating the top plate.

As shown in fig. 7, the two guide roller mounting frames 53 are disposed at both sides of the two vertical mounting plates 16, and since the ends of the driving gear 34, the driven gear 35 and the rotating shaft 33 are located at the outer sides of the vertical mounting plates 16, in order to avoid interference with the movement of the guide roller mounting frames 53, an escape groove is formed on the guide roller mounting frames 53 to form an escape channel 54 for avoiding the driving gear 34, the driven gear 35 and the rotating shaft 33.

In this embodiment, a protective cover is further installed outside the base to shield the driving mechanism 600 and the guide roller assembly 500, so as to prevent the influence of the normal operation of the external sundry pile driving mechanism 600 and the guide roller assembly 500.

When the thermal printing device is used, the first motor 32 drives the thermal printing head 31 to rotate upwards, the two guide roller mounting frames 53 are pulled upwards, the pull rod 55 is rotated to lock the guide roller mounting frames 53, a channel for placing the screen frame 21 in front and back is formed between the thermal printing head 31 and the rubber roller 400 and between the driven guide roller 51 and the driving guide roller 52, after the screen frame 21 is placed, the thermal printing head 31 is rotated downwards to be matched with the rubber roller 400 to press the screen 22, the pull rod 55 is unlocked, the guide roller mounting frames 53 are pushed downwards to move through the spring 57, and the driven guide roller 51 and the driving guide roller 52 are matched to clamp the screen frame. Then, the thermal print head 31 and the second motor 61 are turned on to drive the screen 200 to move forward and backward for thermal printing.

In this embodiment, the first riser 14, the second riser 15, and the vertical mounting plate 16 are part of the base 100.

In this embodiment, the adjustment angle 610 is rotatably mounted on the first vertical plate 14, and the positions of the synchronization rod 68 and the second tensioning wheel 69 on the synchronization rod 68 can be changed by rotating the adjustment angle 610, so as to change the tensioning degree of the third transmission belt 65. The adjustment angle 610 forms an adjustment member, which in other embodiments may be a block-like structure. In this embodiment, the adjusting member is rotatably mounted on the base, and in other embodiments, the adjusting member is movably mounted on the base.

In this embodiment, the second motor 61 can simultaneously drive the driving guide roller 52 and the rubber roller 400 to rotate, so as to form a driving motor, wherein the synchronous rotating shaft 62, the first transmission belt 63, the second transmission belt 64, the third transmission belt 65, the fourth transmission belt 66, the first tension pulley 67 and the corresponding pulleys together form a synchronous transmission mechanism.

In this embodiment, when the thermal print head 31 rotates upward to enable the screen 200 to pass through the passage between the thermal print head 31 and the rubber roller 400, the thermal print head 31 is in the upper avoidance position. When the thermal print head 31 rotates downwards to make the screen 200 cooperate with the rubber roller 400 for printing, the thermal print head 31 is in the lower printing position.

In this embodiment, when the driven guide roller 51 moves upward to allow the screen 200 to pass through the passage between the driven guide roller 51 and the driving guide roller 52, the driven guide roller 51 is at the upper limit. When the driven guide roller 51 moves downward to cooperate with the driving guide roller 52 to clamp the screen frame 21, the driven guide roller 51 is at the lower limit position.

In this embodiment, the stopper pin 59, the spring 57, and the guide 56 form a holding structure for holding the driven guide roller 51 of the guide roller mounting bracket 53 at the upper limit position and the lower limit position.

The utility model discloses embodiment 2 of printer:

in embodiment 1, the synchronous transmission mechanism includes a synchronous rotating shaft and a transmission belt connected to the synchronous rotating shaft. In this embodiment, the synchronous transmission mechanism includes a synchronous rotating shaft, a transmission gear is disposed on the synchronous rotating shaft, and the synchronous driving of each driving guide roller and the rubber roller is realized through a multi-stage transmission gear.

The utility model discloses embodiment 3 of printer:

in the embodiment 1, the driving guide rollers and the rubber rollers are synchronously driven to rotate by a driving motor and a synchronous transmission mechanism. In this embodiment, the driving mechanism may include two or more driving motors. For example, the driving mechanism comprises two driving motors, wherein one driving motor directly drives the rubber roller to rotate, and the other driving motor drives each driving guide roller to rotate. In order to realize synchronous rotation, a controller is additionally arranged and controls all the driving motors to synchronously rotate. For another example, the driving mechanism comprises more than two driving motors, the driving motors are arranged corresponding to the rubber roller and each driving guide roller, and a controller is additionally arranged to control the driving motors to rotate synchronously.

The utility model discloses embodiment 4 of printer:

in embodiment 1, the base comprises two second risers, and the synchronous rotating shaft is rotatably installed on the two second risers. In this embodiment, cancel two second risers, rotate the both ends of installing synchronous rotating shaft on two curb plates.

The utility model discloses embodiment 5 of printer:

in embodiment 1, the base includes two second risers, and the rubber roll rotates to be installed on two second risers. In this embodiment, cancel two second risers, rotate the both ends of rubber roll and install on two curb plates.

The utility model discloses embodiment 6 of printer:

in embodiment 1, the base comprises two first vertical plates, and the driving guide roller is rotatably arranged between the first vertical plates and the side plates. In this embodiment, cancel two first risers, two initiative deflector rolls sharing a center pin, the both ends direct rotation of center pin is installed on two curb plates.

The utility model discloses embodiment 7 of printer:

in embodiment 1, the pull rod and the guide roller mounting frame are rotatably assembled, and the stop fit between the pull rod and the top plate is realized through the stop pin on the pull rod and the long hole on the top plate. In this embodiment, the stop pin on the pull rod is cancelled, the stop pin through hole on the pull rod is reserved, after the guide roller mounting frame is driven by the pull rod to move upwards to the proper position, the stop pin is inserted into the stop pin through hole, and the stop pin is in stop fit with the top surface of the top plate, so that the pull rod is locked. Alternatively, in other embodiments, the top plate may also be provided with a stop pin through hole, and when the stop pin through hole on the pull rod corresponds to the stop pin through hole on the top plate, the stop pin is inserted for locking. When the pull rod is locked by the stop pin which can be inserted and pulled out, the pull rod and the guide roller mounting frame can be fixedly assembled.

The utility model discloses embodiment 8 of printer:

in embodiment 1, the spring can apply a downward force to the guide roller mounting bracket, and can press the driven guide roller against the screen frame. In this embodiment, based on the premise of embodiment 7, another radial through hole may be further formed in the pull rod, and after the driven guide roller is pressed against the screen frame, a stopper pin is inserted into the radial through hole, so that the stopper pin is in stopper fit with the bottom surface of the top plate, and the driven guide roller is held at the lower limit position.

The utility model discloses embodiment 9 of printer:

in embodiment 1, the guide roller mounting frame is movably assembled on the top plate of the base through a pull rod. In this embodiment, the guide roller mounting frame is movably assembled on the side plate of the base in a guiding manner, specifically, a slide block is arranged on one of the guide roller mounting frame and the side plate, a sliding groove is arranged on the other of the guide roller mounting frame and the side plate, and the guide of the guide roller mounting frame is realized through the matching of the slide block and the sliding groove. The corresponding retaining structure can be a jackscrew or the like which is assembled on the chute wall by threads.

The utility model discloses embodiment 10 of printer:

in embodiment 1, each row in the left-right direction has two driving guide rollers and two driven guide rollers, and the driven guide rollers in the same row are installed on one guide roller installation frame. In this embodiment, a guide roller mounting bracket can be evenly arranged corresponding to each driven guide roller, and a synchronizing rod can be connected between the guide roller mounting brackets corresponding to each row of driven guide rollers for realizing synchronization.

The utility model discloses embodiment 11 of printer:

in example 1, there are two driving and driven guide rollers in each row. In this embodiment, the number of the driving guide rollers and the number of the driven guide rollers in each row may be increased or decreased according to actual conditions, or may be one.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. A printer, characterized by: the method comprises the following steps:

a base;

2. The printer according to claim 1, characterized in that: the base comprises a top plate, the guide roller assembly further comprises a pull rod, the lower end of the pull rod is connected with the guide roller mounting frame, the upper end of the pull rod penetrates through the top plate, and the driven guide roller can reciprocate between an upper limit position and a lower limit position through the up-and-down movement of the pull rod;

3. The printer according to claim 2, characterized in that: the holding structure further comprises a spring arranged between the top plate and the guide roller mounting frame, and the spring is used for applying downward elastic force to the guide roller mounting frame so as to hold the driven guide roller at the lower limit position.

4. A printer according to claim 3, wherein: the holding structure further comprises a guide rod fixedly arranged on one of the top plate and the guide roller mounting frame, one end of the guide rod penetrates through the other one of the top plate and the guide roller mounting frame, and the spring is sleeved outside the guide rod.

5. A printer according to claim 3, wherein: the pull rod is rotatably assembled with the guide roller mounting frame;

6. The printer according to claim 1, characterized in that: the base comprises a bottom plate, two side plates arranged on the bottom plate at intervals left and right and a top plate arranged on the side plates, and the bottom plate, the top plate and the two side plates form a closed frame;

7. The printer according to any one of claims 1 to 6, characterized in that: the driving mechanism comprises a driving motor, an output shaft of the driving motor is in transmission connection with a synchronous transmission mechanism, and the synchronous transmission mechanism is in transmission connection with each driving guide roller and each rubber roller.

8. The printer according to claim 7, wherein: the synchronous transmission mechanism comprises a synchronous rotating shaft which is rotatably arranged on the base, and the synchronous rotating shaft is connected with each driving guide roller and the rubber roller through a transmission belt so as to drive each driving guide roller and the rubber roller to rotate synchronously.

9. The printer according to claim 8, wherein: the driving mechanism also comprises a tension wheel which is used for jacking and pressing the transmission belt to tension the transmission belt;

10. The printer according to any one of claims 1 to 6, characterized in that: at least two driving guide rollers and at least two driven guide rollers are arranged on each row in the left-right direction, and each driven guide roller of each row is arranged on the same guide roller mounting frame.