CN209832989U

CN209832989U - Simple printing equipment

Info

Publication number: CN209832989U
Application number: CN201822091264.9U
Authority: CN
Inventors: 王长生; 樊剑; 谢海军
Original assignee: Zhongshan Bi Sheng Printing Technology Co Ltd
Current assignee: Zhongshan Bi Sheng Printing Technology Co Ltd
Priority date: 2018-12-12
Filing date: 2018-12-12
Publication date: 2019-12-24
Anticipated expiration: 2028-12-12

Abstract

The utility model discloses a simple and convenient formula printing apparatus, install the china ink device that stores up in the organism including organism and detachably, be equipped with control circuit board in the organism, it includes the casing and sets up the ink horn in the casing to store up the china ink device, the lower extreme of ink horn has out the china ink mouth, it installs the printing shower nozzle to go out the china ink mouth, it has a butt joint control circuit board's interface to print the shower nozzle, the casing has the hold-down mechanism who is used for the spacing fixed of interface. The utility model provides an interface passes through hold-down mechanism spacing fixed, and the firm degree of installation is higher, and its and printing apparatus's butt joint of being convenient for, more traditional structure connects more reliably, can effectively prevent that the interface from droing or being connected between interface and the printing apparatus not hard up long-term use during operation.

Description

Simple printing equipment

Technical Field

The utility model belongs to the technical field of the printing apparatus, concretely relates to simple and convenient formula printing apparatus.

Background

With the rise of the two-dimensional code, more and more products or product packages are printed with image-text information such as the two-dimensional code, and in the traditional processing and production process, the image-text information is firstly printed on the label through laser, and then the label is attached to the product or the product package, so that the production efficiency is low, the image-text information cannot be directly printed on the product or the product package, and the traditional printer cannot solve the problem. Individual printers are available to solve the above problems. However, in such printers, the electrical connection between the print head and the printer body is made by providing a flat cable, and a circuit board is provided at the end of the flat cable, so that the circuit board extends and overhangs the outer side of the core box housing during installation. In this kind of structural setting, do not carry out comparatively thorough fixed to the connector of circuit board or being used for butt joint printer body, the structure is not firm, has to drop or connects not hard up risk. Moreover, a plurality of circuit boards are generally arranged in the traditional structure, such as a power supply control board, a printing control board, a control board and the like, the structure is complex, and the product weight and the assembly and production difficulty are increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a simple and convenient formula printing apparatus, it carries out spacing reinforcement connection through the interface to ink horn and this body coupling of printing apparatus, prevents to drop and not hard up.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a simple and convenient formula printing apparatus, includes that organism and detachably install the storage ink device in the organism, be equipped with control circuit board in the organism, it includes the casing and sets up the ink horn in the casing to store up the ink device, the lower extreme of ink horn has the ink outlet, the printing shower nozzle is installed to the ink outlet, the printing shower nozzle has a butt joint control circuit board's interface, the casing has the hold-down mechanism who is used for the spacing fixed of interface.

Preferably, be provided with the lead-out wire between casing and the ink horn, the one end electricity of lead-out wire is connected and is printed the shower nozzle, and the other end is provided with the reprint circuit board, the interface sets up on the reprint circuit board, hold-down mechanism is for in the casing upper end towards the left side or towards the right holding chamber that extends the setting, the lower extreme in holding chamber is equipped with the second installation that supplies the interface to wear out and lets the position mouth, the reprint circuit board joint is worn out in the second installation lets the position mouth in the holding intracavity and makes the interface follow the.

Preferably, the casing includes left casing and right casing, and the upper end of left casing extends towards a left side and is provided with the loading board, and the second installation lets the position mouth open on the loading board, the upper end of right side casing is higher than left casing and extends left and is provided with the apron that the lid fits the loading board top, forms the holding chamber between apron and the loading board, and the week side laminating of apron and loading board.

Preferably, an outgoing line is arranged between the shell and the ink box, one end of the outgoing line is electrically connected with the printing nozzle, the other end of the outgoing line is provided with a flexible circuit board, the interface is arranged on the flexible circuit board, and a circle of hard clamping bosses are formed on the periphery of the upper end of the interface, the pressing mechanism is an accommodating cavity for clamping the clamping bosses, in particular, the shell comprises a left shell and a right shell, the upper end of the left shell extends towards the left to be provided with a bearing plate, the bearing plate is provided with a second mounting yielding position opening for the interface to penetrate out, the upper end of the right shell is higher than the left shell and extends leftwards to be provided with a cover plate covering the upper part of the bearing plate, an accommodating cavity is formed between the cover plate and the bearing plate, and the side of apron and loading board is all around laminated, flexible circuit board installs in the holding intracavity and makes the interface wear out in the second installation lets the position mouth, and the second installation lets the lower extreme of the lateral wall upper end butt joint boss of position mouth.

Preferably, the control circuit board is electrically connected with a black-and-white display screen and control keys, and the black-and-white display screen and the control keys are exposed on the surface of the machine body.

Preferably, one side of the machine body is provided with a grab handle, a power supply is installed in the grab handle, and the power supply is electrically connected with the control circuit board.

Preferably, rollers are arranged on two sides of the lower end of the machine body, magnetic encoders are arranged in the rollers, and the magnetic encoders are electrically connected with the control circuit board.

Preferably, the gyro wheel is formed by a roller, the concave position of shaping on the roller, set up anti-skidding rubber ring in the concave position, the pin joint is on a mount pad in the roller both ends, this mount pad passes through fix with screw or adjustable installation on the organism, wherein the tip of roller is embedded to have magnet, magnet follows the roller and rotates, it is provided with the circuit board to correspond magnet in the mount pad, this circuit board electricity connection control circuit board to this forms the magnetic encoder function, calculate the slew velocity of roller through detecting magnetic field variation, and then obtain the movement velocity of printer box body, control printing shower nozzle work.

The utility model has the advantages that: the interface passes through hold-down mechanism spacing fixed, and the firm degree of installation is higher, and its and printing apparatus's butt joint of being convenient for, more traditional structure connects more reliably, can effectively prevent that the interface from droing or being connected between interface and the printing apparatus not hard up long-term use during operation.

Drawings

The invention will be further described with reference to the following figures and examples:

fig. 1 is a schematic structural diagram of a first view angle of the present invention;

fig. 2 is a schematic structural diagram of a second viewing angle of the present invention;

FIG. 3 is a schematic view showing a state in which the ink reservoir is mounted in the body;

FIG. 4 is a schematic structural view of the body;

FIG. 5 is a schematic view of the ink reservoir;

FIG. 6 is a schematic structural view of a flexible board;

FIG. 7 is an installation schematic of the interface;

fig. 8 is an enlarged schematic view of region a in fig. 3.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present 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.

Referring to fig. 1-8, the utility model discloses a exempt from to weld formula ink horn printing apparatus, including organism 1, detachably installs in the organism 1 and stores up ink horn 2.

Ink storage device 2 is used for supplying ink for this printing apparatus, including the casing with set up the ink horn 202 in the casing, the lower extreme of ink horn 202 has out the china ink mouth, it installs the printing shower nozzle to go out the china ink mouth, it has the first point of contact who extends in ink horn 202 lateral wall to print the shower nozzle, be provided with lead-out wire 203 between casing and the ink horn 202, the one end of lead-out wire 203 extends outside first point of contact and corresponds first point of contact and be provided with the second and connect the contact, and its other end extends outside the casing and is provided with interface 206, be provided with soft board 205 between casing and the second connect the contact, have on the soft board 205 with the second connect the protruding structure that the contact is corresponding to for the first point of contact is hugged closely to the. The number of the wiring contacts on the print head is 52, that is, the number of the first connection contacts is 52, and the number of the second connection contacts is 52, and the flexible printed circuit board 205 is also provided with 52 corresponding protruding structures. In addition, the lead-out line 203 is preferably a flat cable.

Compared with the structure on the market, the ink storage device 2 with the structure has the advantages that the outgoing line 203 and the printing spray heads are supported by the soft board 205 to realize connection, 52 densely distributed contacts are not required to be welded, welding processing is omitted, the difficulty of production and processing is reduced, and the production efficiency is improved. And moreover, the soft board 205 is connected in a jacking mode, so that the yield is higher than that of a traditional welding mode, and the production cost is favorably reduced.

Preferably, the convex structure is a convex hull or a pillar, and the soft board 205 is made of silica gel or rubber. When the flexible printed circuit board is installed in the housing, the flexible printed circuit board 205 is pressed to elastically push against the back surface of the second connection contact on the outgoing line 203 through the protruding structure, so that the flexible printed circuit board is tightly attached to the first connection contact, and the electrical connection relationship is stable. The flexible board 205 may be fixed by an assembling relationship, by being glued to the housing, or by providing a concave structure on the housing for fitting.

In order to fix the interface 206, the housing has a pressing mechanism for fixing the interface 206.

As a first preferred embodiment of the pressing mechanism, one end of the outgoing line 203 extending out of the casing is provided with a transfer circuit board, the interface 206 is arranged on the transfer circuit board, the pressing mechanism is an accommodating cavity extending towards the left or right at the upper end of the casing, the lower end of the accommodating cavity is provided with a second installation yielding port through which the interface 206 passes, and the transfer circuit board is clamped in the accommodating cavity and allows the interface 206 to pass through from the second installation yielding port. The accommodating cavity is used for wrapping the transshipment circuit board, and the limiting and fixing are realized only by a mode that the interface 206 penetrates out.

Specifically, the casing includes left casing 204 and right casing 201, and the upper end of left casing 204 extends towards the left and is provided with the loading board, and the second installation lets the position mouth open on the loading board. The upper end of the right housing 201 is higher than the left housing 204 and extends leftwards to form a cover plate covering the upper part of the bearing plate, an accommodating cavity is formed between the cover plate and the bearing plate, and the cover plate and the bearing plate are attached to the periphery of the bearing plate. The left shell 204 and the right shell 201 can be spliced in the structure arrangement in the prior art, which is not described herein. During installation, the ink box 202 is installed in the left shell 204, the outgoing line 203 is installed between the left shell 204 and the ink box 202, the reversed circuit board is placed on the bearing plate, the interface 206 faces downwards and penetrates out of the second installation abdicating port, and then the soft board 205 and the right shell 201 are installed in sequence.

Thus, the transfer circuit board is pressed by the loading plate and the cover plate, only the interface 206 is exposed, the interface 206 is firm, and the interface is convenient to be connected with the printing device. Compared with the traditional structure, the connection is more reliable, and the interface 206 can be effectively prevented from falling off or the connection between the interface 206 and the printing equipment is loosened when the printer is used for a long time.

As a variation of the installation design of the interface 206, the lead-out wire 203 and the interface 206 are butted by a flexible circuit board, a hard clamping boss 207 is formed around the upper end of the interface 206, and the upper end of the side wall of the second installation relief opening is abutted against the lower end of the clamping boss 207 to realize the compression fixation of the interface 206.

With this ink storage device 2 adaptation, organism 1 has upper end open-ended installation cavity 101, and the lower extreme of organism 1 have intercommunication installation cavity 101 and with print the first installation of shower nozzle adaptation and let a mouthful, separable locking mechanism has between casing and the organism 1, ink storage device 2 passes through locking mechanism effect and detachably installs in installation cavity 101.

Compared with the traditional structure, the printing equipment with the structure reduces the arrangement of the flip cover on the machine body 1, does not need to be provided with a flip cover opening mechanism, simplifies the structure composition and reduces the production cost. And the shell of the ink storage device 2 forms one of appearance components of the machine body 1, has larger appearance difference compared with the traditional structure, is novel, and is beneficial to improving the market competitiveness.

As a first preferred embodiment of the locking mechanism in this embodiment, the locking mechanism includes a locking portion 208 disposed on a side surface of the housing and an engaging portion 3 pivoted to a side surface of the machine body 1, and the engaging portion 3 has an engaging concave portion 301 adapted to the locking portion 208 for engaging the locking portion 208 when the ink storage device 2 is completely installed in the installation cavity 101. The engaging portion 3 is located on the right side of the right housing 201 to avoid the interface 206.

In order to facilitate the operation, a torsion spring is disposed between the engaging portion 3 and the machine body 1, and the torsion spring is used for keeping the engaging concave portion 301 at the position of the engaging locking portion 208 under the state of no external force. Therefore, when the ink storage device 2 needs to be assembled or disassembled, the buckling part 3 is manually rotated to enable the locking part 208 to be separated from the buckling concave position 301, the ink storage device 2 can be assembled or disassembled, then the buckling part 3 is loosened, the buckling part 3 automatically resets under the action of the torsion spring, and the locking part 208 is automatically buckled when the ink storage device 2 is assembled, so that automatic locking is realized. In order to cooperate with the rotation engagement of the engaging portion 3, the side surface of the locking portion 208 is configured as a cylindrical surface, a conical surface or a spherical surface, and the side wall of the engaging recess 301 is configured as a cylindrical surface, a conical surface or a spherical surface adapted thereto. For ease of production, cylindrical surfaces are used in this embodiment as shown. In addition, the side wall of the locking portion 208 may be an involute-shaped structure, so that when the locking portion 208 is fastened by the fastening portion 3 in a rotating manner, a pushing force for pressing the ink storage device 2 downward is converted through the involute-shaped side wall, thereby ensuring the installation and positioning of the print head at the first installation abdication port.

In addition to the above structure, in order to facilitate the rotation of the engaging portion 3, as shown in the figure, a pressing plate 302 is further provided on the outer surface of the engaging portion 3 in the present embodiment. The rotating starting of the buckling part 3 is realized by pressing the pressing plate 302, so that the acting force of the torsion spring can be overcome more laborsavingly, and the control is convenient. In addition, in order to avoid the buckling portion 3 protruding out of the upper end of the machine body 1, a tapered mounting concave portion is concavely disposed on a side wall of the mounting cavity 101, so that when the ink storage device 2 is mounted in the mounting cavity 101, the locking portion 208 is located at the bottom of the mounting concave portion. Therefore, when the buckling part 3 is buckled, the buckling part does not protrude out of the upper end of the machine body 1, and the service life is prolonged.

Mainly for the first preferred embodiment, a second preferred embodiment of the locking mechanism in this embodiment is: the engaging portion 3 is horizontally slidably mounted on the body 1, and when the ink storage device 2 is mounted in the mounting cavity 101, the engaging portion 3 is horizontally slid to enable the engaging concave portion 301 to engage with the locking portion 208 to fix the ink storage device 2. The concave-convex position for positioning is arranged between the upper end surface of the locking part 208 and the buckling concave position 301, and when the buckling part 3 is buckled with the locking part 208 in a sliding way, the locking part is fixed relatively through the concave-convex position.

As a third preferred embodiment of the locking mechanism in this embodiment, the locking mechanism includes a first magnet and a second magnet that are disposed on the machine body 1 and the housing, and the first magnet and the second magnet can attract each other, so that when the ink storage device 2 is installed in the installation cavity 101, they are attracted and fixed by the first magnet and the second magnet.

As a fourth preferred embodiment of the locking mechanism in this embodiment, the locking mechanism includes an elastic cantilever disposed on the machine body 1 and a positioning inclined plane disposed on the housing and facing upward, and the elastic cantilever is provided with a fastening platform capable of abutting against the positioning inclined plane. When the ink storage device 2 is installed, the shell of the ink storage device pushes the elastic cantilever outwards, when the ink storage device is installed in place, the buckling table moves inwards along the positioning inclined plane to restore deformation, downward pressure is applied to the shell, and the printing nozzle can be installed in place. When taking out, the ink storage device 2 is directly pulled out, and the buckling table moves reversely and outwards along the positioning inclined plane.

It is further considered that in the conventional structure, the ink outlet of the ink cartridge 202 is usually disposed at one side, i.e. at the left side or the right side of the lower end of the ink cartridge 202, and when the ink cartridge 202 of the conventional structure is installed in a printing apparatus for use, ink cannot be fully used, and more ink remains in the ink cartridge 202, which causes waste and environmental pollution. In view of this, an inclining device may be further disposed in the mounting cavity 101 corresponding to the ink storage device 2, and the ink cartridge 202 may be inclined toward the position of the ink outlet when the ink storage device 2 is mounted in the mounting cavity 101 by the inclining device, so that the ink is completely discharged by gravity during the printing operation, and the ink residue is reduced.

As a first preferred embodiment of the tilting device, the mounting chamber 101 is provided with a limiting wall which is tilted outward relative to the vertical surface on a side wall away from the ink outlet (if the ink outlet is located on the left side of the ink cartridge 202, the side wall is referred to as a right side wall), the housing is provided with a convex portion which can be carried on the limiting wall, and when the ink storage device 2 is mounted in the mounting chamber 101, the convex portion can abut against the limiting wall, so that the side wall of the ink cartridge 202 close to the ink outlet abuts against the mounting chamber 101 under the action of gravity to tilt the ink cartridge 202 toward the ink outlet. In this manner, the entire ink storage device 2 is tilted, and in addition, the above-described tilting device may be provided on the housing and the ink cartridge 202, that is, the housing is normally mounted and the ink cartridge 202 is tilted.

As a second preferred embodiment of the tilting device, the mounting cavity 101 is provided with an elastic member on a side wall away from the ink outlet (if the ink outlet is located on the left side of the ink cartridge 202, the side wall is referred to as a right side wall), so that when the ink storage device 2 is mounted in the mounting cavity 101, the side wall of the housing close to the ink outlet is abutted against the mounting cavity 101 by the elastic member supporting an upper end of the side wall of the housing away from the ink outlet, thereby tilting the ink cartridge 202 toward the position where the ink outlet is located.

In order to control the printing operation, it is preferable that a control circuit board is disposed in the body 1, and the control circuit board has a connector exposed in the mounting cavity 101 and facing upward, so that when the ink storage device 2 is mounted in the mounting cavity 101, the interface 206 can be in butt joint with the connector to electrically connect the printing head to the control circuit board. The printing control device comprises a control circuit board, a printing head and a printing control module, wherein the control circuit board is integrated with the control module and the storage module, the storage module is used for storing printing information, and the control module is electrically connected with the storage module and the printing head.

Still be provided with power 9 in the organism 1, this power 9 electric connection control circuit board for print the work and provide working power 9.

In order to facilitate the operation of the printing apparatus, a handle 5 is disposed on one side of the body 1, and the power supply 9 is installed in the handle 5. The weight difference between the grab handle 5 and the machine body 1 can be reduced by the arrangement, the grab handle is convenient to hold, the hand feeling can be improved, and the fatigue of holding for a long time can be reduced.

Furthermore, the control circuit board is electrically connected with a black-and-white display screen 8 and a control key 7, and the black-and-white display screen 8 and the control key 7 are exposed on the surface of the body 1.

So, printing apparatus in this embodiment only realizes the operation of whole equipment through a control circuit board and controls, and more traditional structure that sets up 9 control panels of power, print control panel, controls a plurality of control panels such as control panel is more retrencied, can effectively reduce product volume, attenuate product thickness, reduces fuselage weight, optimizes the internally mounted structure, reduction in production cost. Moreover, the existing printer is not practical in the practical application process due to the fact that the touch screen is controlled, the better the quality of the adopted touch screen is, the more expensive the price is, the cost is increased, and the problem of insensitive control is easy to occur due to the adoption of the common touch screen. The black and white display screen 8 and the control keys 7 replace the traditional touch screen, so that the production cost is reduced, the problems can be avoided, and the practicability is high.

Further, the lower extreme of organism 1 in this embodiment lets the both sides pivot of a mouthful in first installation and is equipped with gyro wheel 4, and when printing, the lower extreme protrusion of gyro wheel 4 is in the lower terminal surface of printing the shower nozzle to avoid waiting to print the direct laminating of surface of work piece and print the shower nozzle, thereby realize the protection to printing the shower nozzle, and can guarantee to print the quality.

On the basis, a synchronous module is further integrated on the control circuit board and used for detecting the movement direction and the movement speed of the printer box body, and the control module is electrically connected with the synchronous module so as to control the printing spray head to work according to the movement track. The synchronous module is a gyroscope, a photoelectric encoder or a magnetic encoder and is used for converting the mechanical geometric displacement into a pulse or digital quantity which can be identified and read by the control module. In order to facilitate the introduction and the change of the printing information, a communication module is further integrated on the control circuit board and is electrically connected with the storage module. This communication module both can adopt wired communication, also can set up to wireless communication, like bluetooth communication, WIFI communication, infrared communication etc.. Besides the above-mentioned printing control by means of synchronous module, it also can adopt timing module, and can automatically print after the set time of starting operation.

The gyro wheel 4 in this embodiment is formed by a roller, the concave position of shaping on the roller, set up anti-skidding rubber ring in the concave position, the pin joint of roller both ends is on a mount pad 6, this mount pad 6 passes through fix with screw or adjustable installation on organism 1, in addition also can glue or the shaping on organism 1, wherein the tip of roller is embedded to have magnet, magnet follows the roller and rotates, it is provided with the circuit board to correspond magnet in the mount pad 6, this circuit board electricity connection control circuit board, form the magnetic encoder function with this, calculate the slew velocity of roller through detecting magnetic field variation, and then obtain the velocity of motion of printer box body, control printing shower nozzle work.

Furthermore, because the left and right sides of the first installation let position mouth all is provided with gyro wheel 4, can further set up drive arrangement, through corresponding software control, select arbitrary gyro wheel 4 as the drive wheel as required and realize motion control.

The above embodiments are merely preferred embodiments of the present invention, and other embodiments are also possible. Equivalent modifications or substitutions may be made by those skilled in the art without departing from the spirit of the invention, and such equivalent modifications or substitutions are intended to be included within the scope of the claims set forth herein.

Claims

1. The utility model provides a simple and convenient formula printing apparatus, its characterized in that installs the china ink device that stores up in the organism including organism and detachably, be equipped with control circuit board in the organism, it includes the casing and sets up the ink horn in the casing to store up the china ink device, the lower extreme of ink horn has the ink outlet, the printing shower nozzle is installed to the ink outlet, the printing shower nozzle has a butt joint control circuit board's interface, the casing has the hold-down mechanism who is used for the spacing fixed of interface.

2. The simple and convenient printing device as claimed in claim 1, wherein an outgoing line is disposed between the casing and the ink cartridge, one end of the outgoing line is electrically connected to the printing nozzle, the other end of the outgoing line is provided with a transfer circuit board, the interface is disposed on the transfer circuit board, the pressing mechanism is a housing cavity extending leftwards or rightwards from the upper end of the casing, a second mounting yielding port through which the interface passes is disposed at the lower end of the housing cavity, and the transfer circuit board is clamped in the housing cavity and the interface passes through the second mounting yielding port.

3. The simple and convenient printing device as claimed in claim 2, wherein the housing comprises a left housing and a right housing, a bearing plate is provided at the upper end of the left housing extending to the left, the second mounting relief opening is provided on the bearing plate, a cover plate is provided at the upper end of the right housing higher than the left housing and extending to the left to cover the upper side of the bearing plate, a receiving cavity is formed between the cover plate and the bearing plate, and the cover plate and the bearing plate are attached to each other at the peripheral side.

4. The simple and convenient printing device as claimed in claim 1, wherein an outgoing line is disposed between the housing and the ink cartridge, one end of the outgoing line is electrically connected to the printing nozzle, the other end of the outgoing line is disposed with a flexible circuit board, the interface is disposed on the flexible circuit board, and a circle of rigid clamping boss is formed around the upper end of the interface, the pressing mechanism is a holding cavity of the clamping boss, specifically, the housing comprises a left housing and a right housing, a loading plate is extended towards the left from the upper end of the left housing, a second mounting yielding port for the interface to pass through is formed on the loading plate, a cover plate covering the upper side of the loading plate is extended towards the left from the upper end of the right housing, a holding cavity is formed between the cover plate and the loading plate, the cover plate and the loading plate are attached to the periphery of the loading plate, the flexible circuit board is mounted in the holding cavity and the interface passes, and the upper end of the side wall of the second installation yielding port is connected with the lower end of the clamping boss in an abutting mode.

5. The simple and convenient printing device as recited in claim 1, wherein the control circuit board is electrically connected with a black and white display screen and control keys, and the black and white display screen and the control keys are exposed on the surface of the body.

6. The simple and convenient printing device as recited in claim 5, wherein a handle is disposed on one side of the body, a power source is installed in the handle, and the power source is electrically connected to the control circuit board.

7. The simple and convenient printing device as recited in claim 6, wherein rollers are provided at both sides of the lower end of the body, magnetic encoders are provided in the rollers, and the magnetic encoders are electrically connected to the control circuit board.

8. The printing apparatus as claimed in claim 7, wherein the roller is formed by a roller shaft, a concave portion is formed on the roller shaft, an anti-slip rubber ring is disposed in the concave portion, two ends of the roller shaft are pivotally connected to a mounting seat, the mounting seat is fixed to or adjustably mounted on the body by screws, wherein a magnet is embedded in an end portion of the roller shaft and rotates along with the roller shaft, a circuit board is disposed in the mounting seat and corresponds to the magnet, the circuit board is electrically connected to the control circuit board, thereby forming a function of a magnetic encoder, and the rotation speed of the roller shaft is calculated by detecting a change of a magnetic field, so that the movement speed of the printer case is obtained, and the printing head is controlled to operate.