CN210309695U

CN210309695U - Picture and text drawing device

Info

Publication number: CN210309695U
Application number: CN201920936315.5U
Authority: CN
Inventors: 王小栋; 胡斌
Original assignee: Painting Brush Education Science And Technology Shenzhen Co ltd
Current assignee: Painting Brush Education Science And Technology Shenzhen Co ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-04-14
Anticipated expiration: 2029-06-19

Abstract

At least one of a first transmission mechanism and a second transmission mechanism of the image-text drawing device adopts a speed reducing component with the transmission ratio larger than 1, so that when a first arm and/or a second arm are controlled, the tiny rotating angle of the first arm and/or the second arm can be reversely amplified through the speed reducing component, namely a larger rotating angle needs to be output when a motor outputs, in the aspect of motor control, a corresponding input signal is a longer pulse signal, and the motor can accurately identify the signal, thereby ensuring the control precision. Under the structure, the motor can adopt a common motor to realize the accurate control of the rotating arm, and the cost can be reduced while the control accuracy is improved.

Description

Picture and text drawing device

Technical Field

The present application relates to a device for automatically drawing pictures and/or text.

Background

The image-text drawing device is equipment capable of automatically writing and drawing according to a built-in program, and is mainly used for drawing, writing teaching and the like for children. At present, a common image-text drawing device is controlled by a motor and a steering engine to drive a corresponding rotating arm to move, so that drawing can be finished, and handwriting can be simulated.

Whether the motor or the steering engine (the steering engine is driven by the motor) is adopted for driving, as the response of the motor to a small-distance displacement signal has certain uncertainty, for example, when the rotating arm is accurately positioned, the rotating arm is often required to rotate by a very small angle, and the very small angle corresponds to the motor control, which is often a very short pulse signal, but the motor ignores the pulse signal, so that the rotating arm cannot be controlled to accurately move. If the accurate positioning of the rotating arm is further improved, the existing image-text drawing devices can only select a motor or a steering engine with higher accuracy, which causes the cost to be greatly increased, and particularly, the cost is higher in the mode of adopting the steering engine.

Disclosure of Invention

The application provides a novel picture and text drawing device.

An embodiment of the present application provides an image-text drawing device, including:

a base;

the drawing device comprises a rotating arm, a first positioning device and a second positioning device, wherein the rotating arm at least comprises a first arm and a second arm, the second arm is rotatably arranged on the first arm, and the second arm is provided with an installation structure capable of fixing a drawing tool;

the first driving assembly comprises a first motor and a first transmission mechanism, and the first motor drives the first arm to rotate through the first transmission mechanism;

the second driving assembly comprises a second motor and a second transmission mechanism, and the second motor drives the second arm to rotate relative to the first arm through the second transmission mechanism;

and a control unit for controlling the first and second drive assemblies;

the first transmission mechanism is provided with a first speed reducing component with the transmission ratio larger than 1, the input end of the first speed reducing component is in transmission connection with the first motor, the output end of the first speed reducing component is in transmission connection with the first arm and is used for driving the first arm to rotate, and/or the second transmission mechanism is provided with a second speed reducing component with the transmission ratio larger than 1, the input end of the second speed reducing component is in transmission connection with the second motor, and the output end of the second speed reducing component is in transmission connection with the second arm and is used for driving the second arm to rotate; the rotation center line of the second arm is parallel to the rotation center line of the first arm.

In one embodiment, the first reduction assembly comprises a first gearwheel and a first pinion engaged with each other, the first pinion being in driving connection with a first motor, the first gearwheel being in driving connection with the first arm; the second speed reduction assembly comprises a second large gear and a second small gear which are meshed with each other, the second small gear is in transmission connection with a second motor, and the second large gear is in transmission connection with a second arm.

In one embodiment, the second transmission mechanism includes a synchronous belt transmission mechanism, a driving wheel of the synchronous belt transmission mechanism is arranged at the beginning end of the first arm and is in transmission connection with the second gearwheel, a driven wheel of the synchronous belt transmission mechanism is fixedly connected with the second arm, and a synchronous belt of the synchronous belt transmission mechanism extends along the first arm.

In one embodiment, the first arm includes a housing, the synchronous belt drive mechanism is disposed within the housing of the first arm, and the second arm is stacked with the first arm.

In one embodiment, at least one of the first gearwheel and the second gearwheel is correspondingly provided with a clockwork spring, the outer end of the clockwork spring is fixed on the base, the inner end of the clockwork spring is fixedly connected with the shaft part of the corresponding first gearwheel or the corresponding second gearwheel, and the clockwork spring applies acting force to the corresponding first gearwheel or the corresponding second gearwheel to reduce the influence of a transmission gap in gear transmission on output precision.

In one embodiment, the device further comprises a rotating shaft, the first gearwheel and the second gearwheel are coaxially arranged in a stacked manner, the rotating shaft is positioned between the first gearwheel and the second gearwheel, and two ends of the rotating shaft are rotatably arranged in the first gearwheel and the second gearwheel; and the driving wheel of the synchronous belt transmission mechanism and the second gearwheel are coaxially arranged.

In one embodiment, the second arm comprises a fixed seat and a connecting rod, the fixed seat is rotatably connected with the first arm and is in transmission connection with the second transmission mechanism, the connecting rod is detachably and fixedly connected with the fixed seat, and the end parts of the fixed seat and the connecting rod which are connected with each other can be respectively provided with a magnetic part and a fitting part which can be adsorbed by the magnetic part.

In one embodiment, the robot further comprises a first position detection switch and a second position detection switch, wherein the first position detection switch is used for detecting whether the first arm rotates to a starting point on the base, and the second position detection switch is used for detecting whether the second arm rotates to the starting point.

In one embodiment, the robot arm further comprises a first fixing frame and a second fixing frame, wherein the first fixing frame is installed on the base, the first motor and the second motor are arranged in a vertically stacked mode, the second motor is located above the first motor, the first motor is installed at the lower end of the first fixing frame, an output shaft of the first motor extends upwards, the second fixing frame is fixedly installed on the first fixing frame, the second motor is installed on the second fixing frame, an output shaft of the second motor extends downwards, the first gearwheel is installed on the first fixing frame, the second gearwheel is installed on the second fixing frame, and a starting end of the first arm is located between the first gearwheel and the second gearwheel; the bottom surface of the first fixing frame is provided with a first gear mounting groove, the first gearwheel is positioned in the first gear mounting groove, and a gear supporting plate is covered on the first gear mounting groove and used for supporting the first gearwheel; the top surface of the second fixing frame is provided with a second gear mounting groove, the second gearwheel is positioned in the second gear mounting groove, and a gear cover plate is covered on the second gear mounting groove and used for covering the second gearwheel; the second gearwheel is located above the first gearwheel.

In one embodiment, the lifting device further comprises a lifting driving mechanism, the first fixing frame is movably arranged on the base in a lifting mode, and the lifting driving mechanism is used for driving the first fixing frame and parts arranged on the first fixing frame to lift.

According to the image-text drawing device of the embodiment, at least one of the first transmission mechanism and the second transmission mechanism adopts the speed reducing component with the transmission ratio larger than 1, so that when the first arm and/or the second arm are controlled, the tiny rotating angle of the first arm and/or the second arm can be reversely amplified through the speed reducing component, namely a larger rotating angle needs to be output when the motor outputs, in the aspect of motor control, the corresponding input signal is a longer pulse signal, and the motor can accurately identify the signal, thereby ensuring the control precision. Under the structure, the motor can adopt a common motor to realize the accurate control of the rotating arm, and the cost can be reduced while the control accuracy is improved.

Drawings

Fig. 1 and 2 are schematic views of different angles of an image-text rendering device according to an embodiment of the present application;

fig. 3 is an exploded view of an exemplary graphics rendering apparatus according to the present application;

FIG. 4 is a schematic view of the arrangement of the first drive assembly and the second drive assembly in one embodiment of the present application;

FIG. 5 is a schematic view of a first arm in driving connection with a first bull gear according to an embodiment of the present application;

FIG. 6 is a schematic view of the position of the first arm and the first and second holders according to an embodiment of the present disclosure;

fig. 7 is a schematic view illustrating an assembly structure of the first gearwheel and the second gearwheel 421 according to an embodiment of the present application;

FIG. 8 is a schematic view of a reverse structure of a first fastening frame according to an embodiment of the present disclosure;

fig. 9 and 10 are schematic views of different angles of the image-text rendering device according to another embodiment of the present application;

fig. 11 is an exploded view of the structure shown in fig. 9 and 10.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

The present embodiment provides an image-text drawing device for automatically completing drawing work according to a built-in program or receiving an external instruction. The drawing work may include drawing, writing, and the like.

Referring to fig. 1 to 4, in one embodiment, the image-text drawing apparatus includes a base 100, a rotating arm 200, a first driving assembly 300, a second driving assembly 400, and a control unit (not shown).

The base 100 serves as a support member of the entire teletext drawing arrangement, supporting other components, such as the first drive assembly 300, the second drive assembly 400, the control unit, etc. The swivel arm 200 includes at least a first arm 210 and a second arm 220. The second arm 220 is rotatably mounted on the first arm 210, and the second arm 220 has a mounting structure 221 capable of fixing the drawing tool 500. The drawing tool 500 may be various pen tools. The second arm 220 may be disposed at any position of the first arm 210. However, as shown in fig. 1 and 2, the second arm 220 is usually disposed at the end of the first arm 210 (in the embodiment, the end of the first arm 210 connected to the first driving assembly 300 is referred to as the beginning end, and the opposite end is the end), so that the rotating arm 200 formed by the first arm 210 and the second arm 220 can move in a wider range through mutual rotation, and thus the drawing is performed. The mounting structure 221 on the second arm 220 may be used to fix the drawing tool 500 by clamping, screwing, or the like, which is not limited in the present application.

The first driving assembly 300 includes a first motor 310 and a first transmission mechanism, and the first motor 310 drives the first arm 210 to rotate through the first transmission mechanism. The second driving assembly 400 includes a second motor 410 and a second transmission mechanism, and the second motor 410 drives the second arm 220 to rotate relative to the first arm 210 through the second transmission mechanism. The control unit is configured to control the first driving assembly 300 and the second driving assembly 400, so that the rotating arm 200 performs drawing according to a built-in program or an instruction received from the outside.

Wherein the rotation center line of the second arm 220 is parallel to the rotation center line of the first arm 210. As shown in fig. 1 and 2, the rotation center line of the second arm 220 and the rotation center line of the first arm 210 are both disposed perpendicular to the horizontal plane. Of course, in other embodiments, the center line of rotation of the second arm 220 and the center line of rotation of the first arm 210 may also be disposed along a horizontal plane, i.e., both perpendicular to a vertical plane.

In this embodiment, only two arm bodies are shown to be connected end to form a single-side arm structure, so that the structure of the rotating arm 200 can be more concise. Of course, in other embodiments, a greater number of arms may be added. The arm bodies can be connected end to end as shown in fig. 1 and 2, and can also form a quadrilateral or other-shaped structure.

Further, in order to reduce the requirement for the precision of the motor, the first transmission mechanism has a first speed reduction assembly with a transmission ratio greater than 1, an input end of the first speed reduction assembly is in transmission connection with the first motor 310, and an output end of the first speed reduction assembly is in transmission connection with the first arm 210 to drive the first arm 210 to rotate, and/or the second transmission mechanism has a second speed reduction assembly with a transmission ratio greater than 1, an input end of the second speed reduction assembly is in transmission connection with the second motor 410, and an output end of the second speed reduction assembly is in transmission connection with the second arm 220 to drive the second arm 220 to rotate.

The first speed reduction assembly and the second speed reduction assembly with the transmission ratio larger than 1 can reduce the rotation angle output by the motor, so that when the first arm 210 and/or the second arm 220 are controlled, the small rotation angle of the first arm 210 and/or the second arm 220 can be reversely amplified through the speed reduction assemblies, namely, a larger rotation angle needs to be output when the motor outputs, in the aspect of motor control, the corresponding input signal is a longer pulse signal, the motor can accurately identify the signal, and the control precision is ensured. Under the structure, the motor can adopt a common motor to realize the accurate control of the rotating arm 200, and the cost can be reduced while the control accuracy is improved.

The first speed reducing component and the second speed reducing component with the transmission ratio larger than 1 can adopt various speed reducing structures meeting the requirements. Generally speaking, the diameter of the driving wheel in the speed reducing assembly is smaller than that of the driven wheel, so that the rotation angle output by the motor can be converted. For example, a reduction gear set, a reduction belt pulley set, a reduction sprocket set, and other reduction structures that meet the requirements are employed as the first reduction assembly and the second reduction assembly in the present embodiment.

Referring to fig. 3 and 4, in one embodiment, the first decelerating assembly includes a first large gear 321 and a first small gear 322 engaged with each other, the first small gear 322 is in transmission connection with the first motor 310, and the first large gear 321 is in transmission connection with the first arm 210.

The transmission connection in this embodiment refers to a connection capable of transmitting motion, and may be a fixed connection or a movable connection. The first pinion 322 may be directly fixed to the output shaft of the first motor 310, or may be in transmission connection with the first motor 310 through other transmission structures (e.g., an intermediate gear, a pulley structure, a sprocket structure, etc.). Similarly, the first gearwheel 321 is in driving connection with the first arm 210, and may be implemented by fixedly connecting the first gearwheel 321 with the first arm 210, or by other driving structures (such as an intermediate gear, a pulley structure, a sprocket structure, etc.).

Referring to fig. 3 and 5, in an embodiment, the first gearwheel 321 has a protrusion 3211, the protrusion 3211 has a non-circular outer shape, the first arm 210 (e.g., the lower wall 211) has an assembly hole 2111 matching the outer shape of the protrusion 3211, and the first arm 210 is sleeved on the protrusion 3211 of the first gearwheel 321 through the assembly hole 2111 and can drive the first arm 210 to rotate when the first gearwheel 321 rotates. This embodiment provides only one kind of driving connection of the first arm 210 and the first gearwheel 321, but in other embodiments, the driving connection may be realized by other means, such as welding, screwing, etc.

Further, in an embodiment, the second speed reduction assembly may also be implemented by a gear transmission. Specifically, referring to fig. 3 and 4, the second decelerating assembly includes a second large gear 421 and a second small gear 422 engaged with each other, the second small gear 422 is in transmission connection with the second motor 410, and the second large gear 421 is in transmission connection with the second arm 220.

Similarly, the second pinion 422 may be directly fixed to the output shaft of the second motor 410, or may be connected to the second motor 41 through other transmission structures (such as an intermediate gear, a pulley structure, a sprocket structure, etc.). The second gearwheel 421 is in transmission connection with the second arm 220, and may be implemented by fixedly connecting the second gearwheel 421 with the second arm 220, or by other transmission structures (such as an intermediate gear, a pulley structure, and a sprocket structure).

The first transmission mechanism and the second transmission mechanism realize speed reduction by adopting the gear transmission mode, can ensure the precision and synchronism of rotation transmission, is favorable for the precise control of the first arm 210 and the second arm 220, and ensures that the swing of the first arm 210 and the precision control of the second arm 220 are in a uniform range. Of course, in other embodiments, the first speed reduction assembly and the second speed reduction assembly may each be implemented using different structures.

Further, the first and

second driving assemblies

300 and 400 may control the first and

second arms

210 and 220 independently, respectively, for example, the second driving assembly 400 and the second arm 220 are integrally disposed on the first arm 210, i.e., the first arm 210 may bring the second driving assembly 400 and the second arm 220 to move together.

In addition, referring to fig. 3 and 4, in an embodiment, the second transmission mechanism includes a synchronous belt transmission mechanism 430, a driving pulley 431 of the synchronous belt transmission mechanism 430 is disposed at the beginning of the first arm 210 and is in transmission connection with the second gearwheel 421, a driven pulley 432 of the synchronous belt transmission mechanism 430 is fixedly connected with the second arm 220, and a synchronous belt 433 of the synchronous belt transmission mechanism 430 extends along the first arm 210.

The arrangement of the synchronous belt transmission mechanism 430 makes it possible to arrange the second motor 410 and the second reduction assembly on the base 100 without arranging them on the first arm 210, which not only reduces the load of the first arm 210, avoids the load increase of the first motor 310 caused by the overweight of the first arm 210 and the second driving assembly 400, but also makes the center of gravity of the whole device more concentrated on the base 100, making the structure more compact.

For simplicity of the overall appearance, in one embodiment, the first arm 210 includes a housing, and the synchronous belt drive mechanism 430 is disposed within the housing of the first arm 210. This allows the synchronous belt drive mechanism 430 to be housed inside the first arm 210, hiding the synchronous belt drive mechanism 430. Referring to fig. 1 to 4, the housing may include a lower wall 211 and an upper cover 212, the lower wall 211 and the upper cover 212 enclosing an accommodating cavity for accommodating the synchronous belt drive mechanism 430. Of course, the timing belt drive mechanism 430 need not be embedded in the first arm 210, and may be disposed outside the first arm 210.

Referring to fig. 4, in one embodiment, the driven pulley 432 of the synchronous belt transmission mechanism 430 is fixedly connected to the beginning end of the second arm 220, so as to drive the second arm 220 to rotate along with the driven pulley 432 of the synchronous belt transmission mechanism 430.

The second arm 220 is stacked on the first arm 210. Wherein the second arm 220 is positioned below the first arm 210, as shown in fig. 1 and 2. In other embodiments, the second arm 220 may also be disposed above the first arm 210. Alternatively, in some examples, the first arm 210 and the second arm 220 may be rotatably mounted on an intermediate member.

In order to improve the compactness of the whole device, please refer to fig. 4, 6 and 7, in an embodiment, the device further includes a rotating shaft 600, the first gearwheel 321 and the second gearwheel 421 are coaxially stacked, the rotating shaft 600 is located between the first gearwheel 321 and the second gearwheel 421, and two ends of the rotating shaft are rotatably disposed in the first gearwheel 321 and the second gearwheel 421. The first gearwheel 321 and the second gearwheel 421 are rotatably arranged on the same rotating shaft 600, so that the compactness can be improved as much as possible. Moreover, the first motor 310 and the second motor 410 are not affected to control the rotation of the first gearwheel 321 and the second gearwheel 421. Normally, the first gearwheel 321 and the second gearwheel 421 do not rotate individually, but rather under program control the first motor 310 and the second motor 410 cooperate to rotate together, thereby controlling the position of the rotating arm 200. Further, the driving wheel 431 of the synchronous belt transmission mechanism 430 is coaxially or fixedly connected with the second gearwheel 421. The driving wheel 431 of the synchronous belt transmission mechanism 430 is arranged between the first gearwheel 321 and the second gearwheel 421, so that the structure compactness can be further improved, the device is smaller, and the jacket with various shapes can be arranged outside the device, so that the device can be decorated into various human shapes, animal shapes or other types of shapes.

Referring to fig. 4, in an embodiment, the first motor 310 and the second motor 410 are stacked up and down, and the second motor 410 is located above the first motor 310. The structure is favorable for realizing the structure that the first gearwheel 321 and the second gearwheel 421 are stacked up and down, and the shape of the whole device is more vertical, so that the jacket with vertical shapes such as human shape is easier to sleeve. Moreover, the motor layout can enable the gravity center of the device to be more concentrated, and stability is improved.

Specifically, referring to fig. 1 to 6, in an embodiment, the present invention further includes a first fixing frame 710 and a second fixing frame 720, the first fixing frame 710 is installed on the base 100, the first motor 310 is installed at a lower end of the first fixing frame 710, an output shaft of the first motor 310 extends upward, the second fixing frame 720 is fixedly installed on the first fixing frame 710, the second motor 410 is installed on the second fixing frame 720, an output shaft of the second motor 410 extends downward, the first gearwheel 321 is installed on the first fixing frame 710, the second gearwheel 421 is installed on the second fixing frame 720, and a start end of the first arm 210 is located between the first gearwheel 321 and the second gearwheel 421.

The first fixing frame 710 may be provided with at least two symmetrical protruding columns 711, and the first motor 310 is located below the first fixing frame 710. The housing of the first motor 310 has a support lug 311, the boss 711 abuts against the support lug 311 of the first motor 310, and the support lug 311 and the boss 711 can be fixedly connected through a screw, so that the first motor 310 is fixed. The first fixing frame 710 can press the first motor 310 downward to press it against the base 100.

Referring to fig. 1 to 6 and fig. 8, in an embodiment, a bottom surface of the first fixing frame 710 has a first gear mounting groove 712, the first gearwheel 321 is located in the first gear mounting groove 712, and a gear supporting plate 730 is covered on the first gear mounting groove 712 for supporting the first gearwheel 321. The projection 3211 of the first large gear 321 penetrates the first gear mounting groove 712 and protrudes above the first fixing frame 710 so as to be capable of being in transmission connection with the first arm 210.

The top surface of the second fixing frame 720 has a second gear mounting groove 721, the second gearwheel 421 is located in the second gear mounting groove 721, and a gear cover 740 is covered on the second gear mounting groove 721 to cover the second gearwheel 421. The second gearwheel 421 is located above the first gearwheel 321. The second large gear 421 also has a boss 4211 protruded upward, and the upper end of the rotary shaft 600 can be installed in the boss 4211. The lower end of the rotating shaft 600 can be installed in the upward projection 3211 of the first large gear 321.

The bottom of the second gearwheel 421 is exposed from the second gear mounting slot 721, so as to be in transmission connection with the driving pulley 431 of the synchronous belt transmission mechanism 430. Referring to fig. 4 and 7, the second gearwheel 421 has a mounting hole 4212 with a toothed structure, and the driving pulley 431 of the synchronous belt transmission mechanism 430 is inserted into the mounting hole 4212 to form a transmission fit, so that the driving pulley 431 of the synchronous belt transmission mechanism 430 is driven to rotate by the second gearwheel 421.

Further, in an embodiment, the present invention further includes a lifting driving mechanism, the first fixing frame 710 is movably installed on the base 100 in a lifting manner, and the lifting driving mechanism is used for driving the first fixing frame 710 and the component installed on the first fixing frame 710 to lift.

Referring to fig. 1 to 3, in an embodiment, the base 100 has at least two opposite lifting guide rods 110, the first fixing frame 710 has a lifting portion 713 corresponding to the lifting guide rods 110, and the lifting portion 713 is disposed on the lifting guide rods 110 in a lifting manner. The first fixing frame 710 and the base 100 are provided with an elastic member 714, and the elastic restoring force of the elastic member 714 urges the first fixing frame 710 to move towards the base 100. The lifting driving mechanism can be driven by a motor, a steering engine and other driving devices. As shown in fig. 1 to 3, the lifting driving mechanism is driven by a steering engine 810, and a cam 820 is mounted on an output shaft of the steering engine 810. The cam 820 is located below the first fixing frame 710, and when the steering engine 810 drives the cam 820 to rotate upwards, the first fixing frame 710 and other components above are jacked up together, so that the first fixing frame 710 and other components above are lifted.

In gear transmission, it is common to have a transmission clearance between the gear teeth and the tooth grooves, thereby affecting the accuracy of the gear transmission. Referring to fig. 9-11, in an embodiment, at least one of the first gearwheel 321 and the second gearwheel 421 is provided with

springs

910, 920. The inner ends of the

springs

910 and 920 are fixedly connected to the shaft portions of the corresponding first gearwheel 321 or second gearwheel 421, and the shaft portions may be the protruding portions 3212 at the bottom of the first gearwheel 321 as shown in fig. 7 and the protruding portions 4211 of the second gearwheel 421 as shown in fig. 11.

The

springs

910, 920 are fixed to the base 100 at their outer ends, including directly to the base 100, and also to other components fixedly connected to the base 100. For example, the outer end of the spring 910 fixed corresponding to the first gear 321 may be fixed on the gear plate 730, and the gear plate 730 is provided with a plurality of notches 731 for catching the outer end of the spring 910. The spring 920 fixed corresponding to the second large gear 421 may be fixed on a second gear mounting groove 721 of the second fixing frame 720, and the second gear mounting groove 721 is provided with a plurality of notches 722 for locking the outer end of the spring 920.

The spring applies acting force to the corresponding first gearwheel 321 or the second gearwheel 421, so that the influence of transmission clearance in gear transmission on output precision is reduced. Wherein, only one or two of the first gearwheel 321 and the second gearwheel 421 can be provided with

corresponding springs

910, 920.

Further, for the convenience of storage and maintenance and replacement, referring to fig. 9-11, in an embodiment, the second arm 220 includes a fixing seat 222 and a connecting rod 223, the fixing seat 222 is rotatably connected to the first arm 210 and is in transmission connection with the second transmission mechanism, and the connecting rod 223 is detachably and fixedly connected to the fixing seat 222.

As an example, the end portions of the fixing base 222 and the connecting rod 223 connected to each other may be respectively provided with a magnetic member and a fitting member capable of being attracted by the magnetic member, the magnetic member may be a magnet, and the fitting member may be an iron sheet or other material capable of being attracted by the magnet, and may also be a magnet, so that the fixing base 222 and the connecting rod 223 have an attraction effect on each other, and thus the second arm 220 is flexibly replaced, and the color of the pen is conveniently replaced or the damaged second arm 220 is conveniently replaced.

Besides magnetic attraction, a clamping or other detachable structure can be arranged between the fixed seat 222 and the connecting rod 223 at the same time to enhance the fixing effect of the fixed seat and the connecting rod. Of course, in other embodiments, the fixing base 222 and the connecting rod 223 can be detachably connected in other manners.

Preferably, referring to fig. 11, the fixing base 222 may have an insertion cavity 2221, and the connecting rod 223 may be inserted and fixed into the insertion cavity 2221. Wherein the magnetic member or the mating member may be disposed in the insertion cavity 2221 so that the connecting rod 223 is fixed in the insertion cavity 2221 by being caught when being inserted.

Further, in one embodiment, the device further comprises a first position detection switch and a second position detection switch. The first position detecting switch is used to detect whether the first arm 210 rotates to a start position on the base 100. The first position detecting switch can be any detecting device capable of detecting the stroke position of the first arm 210, for example, fig. 10 and 11 show a reset switch 716 with a spring piece, when the first arm 210 touches the spring piece, the reset switch 716 can be triggered to send out a position signal, so that the control unit controls the first arm 210 to stop moving. Of course, the first position detection switch may also be other types of detection devices, such as a travel switch, a hall switch, etc. The first position detecting switch is fixedly mounted on the base 100, which includes directly fixing on the base 100, and may also include fixing on other components fixedly connected with the base 100, such as the first fixing frame 710.

The second position detecting switch is used to detect whether the second arm 220 rotates to the starting position. The second position detecting switch may employ various detecting means capable of detecting the stroke position of the second arm 220. The second position detection switch may have the same structure as the first position detection switch, but may have a different structure.

Referring to fig. 9-11, in an embodiment, the second detecting switch is a hall switch 715, and the hall switch 715 is mounted on the base 100, which includes fixing directly on the base 100, and may also include fixing on other components fixedly connected to the base 100, such as the first fixing frame 710.

Correspondingly, the second arm 220 is mounted with a reset magnet 224 that facilitates detection by the hall switch 715, such as may be provided on the mounting structure 221 of the second arm 220. When the second arm 220 rotates relative to the first arm 210, the reset magnet 224 gradually approaches the hall switch 715, and once detected by the hall switch 715, the control unit may control the second arm 220 to stop rotating according to a signal fed back by the hall switch 715, so that the second arm 220 maintains the current position.

The position defined by the first position detection switch may be defined as a starting position of the first arm 210, which the first arm 210 may return to before starting drawing. The position defined by the second position detection switch may be defined as a starting position of the second arm 220, which the second arm 220 may return to before starting drawing. Therefore, the device can find the original starting point, find the working range to the maximum extent and improve the precision. Further, when the second arm 220 is stored to the start position, the volume of the entire drawing apparatus can be reduced, and storage is facilitated.

The device shown in the embodiment has the advantages of simple structure, low cost, reliable operation and high stability. Meanwhile, the speed is reduced through the reduction gear, and the track precision and the stability can be improved.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims

1. An image-text drawing device characterized by comprising:

a base;

and a control unit for controlling the first and second drive assemblies;

2. The apparatus of claim 1, wherein the first deceleration assembly comprises a first gearwheel and a first pinion in meshing engagement with each other, the first pinion being in driving connection with a first motor, the first gearwheel being in driving connection with the first arm; the second speed reduction assembly comprises a second large gear and a second small gear which are meshed with each other, the second small gear is in transmission connection with a second motor, and the second large gear is in transmission connection with a second arm.

3. The image-text drawing device according to claim 2, wherein the second transmission mechanism comprises a synchronous belt transmission mechanism, a driving wheel of the synchronous belt transmission mechanism is arranged at the beginning of the first arm and is in transmission connection with the second gearwheel, a driven wheel of the synchronous belt transmission mechanism is fixedly connected with the second arm, and a synchronous belt of the synchronous belt transmission mechanism is arranged along the first arm in an extending manner.

4. A teletext rendering arrangement according to claim 3, wherein the first arm comprises a housing, the synchronous belt drive being arranged within the housing of the first arm, the second arm being arranged in a stack with the first arm.

5. The image-text drawing device according to claim 2, wherein at least one of the first gearwheel and the second gearwheel is provided with a spring in correspondence, an outer end of the spring is fixed on the base, an inner end of the spring is fixedly connected with a shaft portion of the corresponding first gearwheel or the second gearwheel, and the spring applies an acting force to the corresponding first gearwheel or the second gearwheel to reduce an influence of a transmission gap in gear transmission on output accuracy.

6. The image-text drawing device according to claim 3, further comprising a rotating shaft, wherein the first gearwheel and the second gearwheel are coaxially stacked, the rotating shaft is located between the first gearwheel and the second gearwheel, and both ends of the rotating shaft are rotatably disposed in the first gearwheel and the second gearwheel; and the driving wheel of the synchronous belt transmission mechanism and the second gearwheel are coaxially arranged.

7. The image-text drawing device according to claim 1, wherein the second arm includes a fixing base and a connecting rod, the fixing base is rotatably connected to the first arm and is in transmission connection with the second transmission mechanism, the connecting rod is detachably and fixedly connected to the fixing base, and the mutually connected ends of the fixing base and the connecting rod may be provided with a magnetic member and a fitting member capable of being attracted by the magnetic member, respectively.

8. The image-text drawing device according to claim 1, further comprising a first position detection switch for detecting whether the first arm rotates to a start point on the base, and a second position detection switch for detecting whether the second arm rotates to the start point.

9. The image-text drawing device according to any one of claims 3 to 6, further comprising a first fixing frame and a second fixing frame, wherein the first fixing frame is mounted on a base, the first motor and the second motor are stacked up and down, the second motor is located above the first motor, the first motor is mounted at the lower end of the first fixing frame, an output shaft of the first motor extends upward, the second fixing frame is fixedly mounted on the first fixing frame, the second motor is mounted on the second fixing frame, an output shaft of the second motor extends downward, the first gearwheel is mounted on the first fixing frame, the second gearwheel is mounted on the second fixing frame, and a start end of the first arm is located between the first gearwheel and the second gearwheel; the bottom surface of the first fixing frame is provided with a first gear mounting groove, the first gearwheel is positioned in the first gear mounting groove, and a gear supporting plate is covered on the first gear mounting groove and used for supporting the first gearwheel; the top surface of the second fixing frame is provided with a second gear mounting groove, the second gearwheel is positioned in the second gear mounting groove, and a gear cover plate is covered on the second gear mounting groove and used for covering the second gearwheel; the second gearwheel is located above the first gearwheel.

10. The image-text drawing device according to claim 9, further comprising a lifting drive mechanism, wherein the first fixing frame is movably mounted on the base in a lifting manner, and the lifting drive mechanism is used for driving the first fixing frame and the component mounted on the first fixing frame to lift.