CN209312280U - A four-cam coaxially driven braille display device - Google Patents

Abstract

The utility model discloses a four-cam coaxially driven braille point display device. The stylus driving mechanism is mainly composed of a stylus, a cam, a camshaft and a compression spring, and is installed inside the support frame; the stepping motor drives the camshaft, drives the cam to rotate, and makes the stylus move up and down, and the cam has 16 stop positions for one revolution. The interval angle is 22.5 degrees. Through the special arrangement of the stop positions on the respective cams, the stylus is in the bottom stop position or the top stop position, so that the four stylus of the stylus drive mechanism form 16 different Braille characters; two camshafts and 8 pieces When the stylus cooperates and rotates once, there are 256 combinations of stop positions of the 8 stylus, forming a concave-convex arrangement of 8 Braille contacts, and realizing all combinations of 8 Braille contacts on one side. The utility model has the advantages of simple driving mode, one driver can realize the concave-convex presentation of four Braille contacts, low power consumption, small size, high motion precision, etc., and is easy to popularize Braille display devices, and has good social benefits and application value.

Description

A four-cam coaxially driven braille display device

technical field

The utility model relates to a braille display device, in particular to a four-cam coaxially driven braille display device, which can dynamically display braille and is used for reading and learning braille.

Background technique

According to the global population statistics of the World Health Organization (WHO) in 2010, there are approximately 285 million visually impaired people in the world, and China is the country with the largest number of blind people in the world. It is very difficult for blind people to communicate information, and for such a large group of blind people, the society needs to give them care and support.

The ways for blind people to obtain information include auditory reading and touch reading, while tactile reading relying on fingers has the characteristics of fast reading speed and good information discrimination. One of the skills is the main way for the blind to acquire knowledge and information at this stage.

However, traditional paper-based Braille books are expensive and store less information. What the blind need is a low-cost, strong experience, easy to carry, fast response, real-time reading, fast refresh, and visual pixel replacement. Contact Braille reading device.

Although scholars at home and abroad have developed various types of braille display devices, the only successful braille display drive mechanisms are piezoelectric ceramic and electromagnetic. Moreover, these braille point display machines are expensive in construction, consume a lot of power, and are not easy to carry. Therefore, developing a braille dot mechanism block with low power consumption, low cost and portability is of great value to the development and popularization of braille reading devices or braille display devices.

Utility model content

In order to solve the problems in the background technology, the utility model provides a four-cam coaxially driven braille display device.

The technical scheme that the utility model solves its technical problem adopts is:

The utility model comprises two stylus drive mechanisms, a touch panel and a support frame; two rows of stylus drive mechanisms with the same structure are installed between the two support frames, and the touch panel is installed between the two support frames; A stylus mounting hole is provided, and each stylus driving mechanism has four stylus pins, and the eight stylus pins of the two stylus driving mechanisms are installed in the stylus mounting holes on the touch panel.

The two stylus drive mechanisms have the same structure, each of which includes four stylus pins, four cams, a camshaft and four compression springs; the upper ends of the four stylus pins extend into the In the installation hole of the stylus, there is a clearance fit between the stylus and the installation hole of the stylus; the four styli are arranged in a straight line, and each stylus is equipped with a compression spring, and the lower ends of the four styli are connected with the four cams respectively. The surface profile is always kept in contact under the action of the compression spring, and the four cams are coaxially fixed on the camshaft, and the camshaft is installed on the support frame through the bearing; The lower end of the spring is fixed on the protruding step at the lower end of the contact pin.

Each of the two supporting frames is equipped with a stepping motor, the output shaft of the stepping motor is coaxially connected with the camshaft of the stylus driving mechanism, and the stepping motor drives the camshaft to rotate, and then synchronously drives the four cams to rotate synchronously .

The Braille display device displays the Braille characters of 8 Braille contacts on one side; the Braille characters of the 8 Braille contacts on one side are formed by eight stylus in four rows and two columns respectively in the upper stop position or the lower stop position. Eight concave-convex dots are arranged, and the four contact pins of each column are driven by a camshaft, and the four contact pins of the other column are driven by another camshaft.

There are 16 stop positions evenly distributed at intervals of one rotation of each cam, and the interval angle between adjacent stop positions is 22.5 degrees. The stop positions are divided into upper stop positions or lower stop positions; The needles pass through the special arrangement of the stop positions on the respective cams, so that the four stylus corresponding to a row of four stylus contacts displaying 16 kinds of Braille contacts when the cam rotates once; in the two stylus driving mechanisms, two camshafts rotate Within a week, the two stylus driving mechanisms are respectively controlled so that two columns of eight stylus jointly form 256 types of Braille contact display, thereby realizing all combinations of 8 Braille contacts on one side of the display.

The four cams are coaxially and fixedly mounted on the camshaft, and during the synchronous rotation of the four cams, the arrangement of stop positions on the four cams also remains fixed and rotates synchronously.

In the same stylus driving mechanism, the stop positions of the four cams are arranged in the following table:

In the above table, 0 means bottom stop, 1 means top stop.

The camshaft and the cam are designed to be integral or fixed together after being manufactured separately.

The touch panel is provided with contact pin installation holes corresponding to the number of contacts of the Braille characters, and its size and arrangement conform to the requirements of the Braille characters for the size and spacing of the contacts.

The camshaft is installed on the support frame, can be directly installed in the hole of the support frame, and can also be installed in the hole of the support frame through the bearing.

The support frame can be made separately from the touch panel, or can be designed as an integral structure.

The utility model has the following beneficial effects:

The stylus driving mechanism designed by the utility model installs 4 cams with different contours coaxially, and is driven by the same driver to form 16 stop positions, realizing 16 concave-convex presentations of 4 Braille contacts, with the same structure The two-column stylus drive mechanism can form a concave-convex arrangement of 8 Braille contacts, and realize all the combinations of 8 Braille contacts on one side. The driving method is simple, low power consumption, small size, high movement precision, etc., and it is easy to use for Braille displays. control.

Description of drawings

Fig. 1 is the general assembly drawing of 8 braille contacts on one side of the utility model;

Fig. 2 is a structural diagram of a touch panel and a support frame;

Fig. 3 is an assembly relationship diagram of contact pins, compression springs, cams, camshafts and bearings;

Fig. 4 is a diagram showing the corresponding relationship between the contour shapes and positions of the four cams on the camshaft.

In the figure, I-stylus drive mechanism, 1-touch panel, 2-support frame, 3-motor installation box, 4-stepper motor, 5, 6, 7, 8, 9, 10, 11, 12-stylus Mounting holes, 13, 14- bearing mounting holes, 15, 16- camshaft mounting holes, 17, 18- protruding part of support frame, 19, 20- groove part of support frame, 21, 22, 23, 24, 25, 26 , 27,28-contact pin, 29-compression spring, 30,31-camshaft, 32,33-bearing, 34,35,36,37-cam.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

The braille point display device driven by four cams coaxially consists of a stylus drive mechanism 1, a touch panel 1 and a support frame 2. Fig. 1 to Fig. 4 have shown the device of the present utility model that is made up of one Braille character by eight stylus, will be described in detail below.

As shown in Figure 1, the utility model is specifically implemented and includes two stylus driving mechanisms 1, touch panel 1 and support frame 2; Two columns of stylus driving mechanisms 1 with the same structure are all installed between the two support frames 2, touch Plate 1 is installed between two support frames 2; Touch panel 1 is provided with stylus mounting holes 5, 6, 7, 8, 9, 10, 11, 12, and each stylus driving mechanism 1 has four styli 21,22,23,24,25,26,27,28, eight styli 21,22,23,24,25,26,27,28 of two stylus driving mechanisms 1 are installed on the touch panel 1 Eight contact pins are installed in holes 5, 6, 7, 8, 9, 10, 11, 12.

As shown in Figure 3, two stylus driving mechanisms 1 have the same structure, and each stylus driving mechanism 1 includes four pieces of stylus 21, 22, 23, 24, four cams 34, 35, 36, 37, a cam The shaft 31 and four compression springs 29, 38, 39, 40; the upper ends of the four contact pins 21, 22, 23, 24 extend into the contact pin mounting holes 5, 6, 7, 8 installed on the touch panel 1, The contact pins 21, 22, 23, 24 are in clearance fit with the contact pin mounting holes 5, 6, 7, 8; the four contact pins 21, 22, 23, 24 are arranged in a straight line, and the four corresponding to the four contact pins A contact pin mounting hole 5,6,7,8 is also arranged along a straight line, and each contact pin 21,22,23,24 is equipped with a compression spring 29,38,39,40, four contact pins 21,22 , 23, 24 lower ends are respectively kept in contact with the upper surface contours of the four cams 34, 35, 36, 37 under the action of the compression springs 29, 38, 39, 40, and the four cams 34, 35, 36, 37 are coaxially fixedly installed On the camshaft 31, the camshaft 31 is installed on the support frame 2 through the bearing 32; the upper end of the compression spring is connected to the end surface around the contact pin installation holes 5, 6, 7, and 8 of the touch panel 1, and the lower end of the compression spring is fixed on the contact pin. On the step protruding from the lower end of the needle.

The contact pins 21, 22, 23, 24 can move up and down in the mounting holes 9, 10, 11, 12 under the drive of the cams 34, 35, 36, 37, and the contact pin mounting holes limit and guiding role. The compression springs 29, 38, 39, 40 are enveloped on the outside of the contact pins 21, 22, 23, 24. When the assembly is completed, the compression springs 29, 38, 39, 40 are connected to the touch panel 1, connected to the lower end of the contact pins, and compressed The springs 29, 38, 39, 40 are always in a compressed state, and play the role of contact pin reset.

As shown in Figure 1, stepping motor 4 is respectively installed on two support frames 2, and the camshaft 31 coaxial connection of stepping motor 4 output shafts and stylus drive mechanism 1 is connected, and stepping motor 4 drives camshaft 31 to rotate, And then synchronously drives four cams to rotate synchronously.

As shown in Figure 2, the camshaft 30 is installed in the hole 14 on one side of the support frame 2 through the bearing 33, and the camshaft 31 is installed in the hole 13 on the other side of the support frame 2 through the bearing 32, and the other of the camshafts 30 and 31 One end is respectively installed in the holes 15 and 16 of the support frame 2 , the hole 14 is coaxial with the hole 15 , and the hole 13 is coaxial with the hole 16 . Camshafts 30 and 31 may also be supported by cantilevers.

In this mechanism, the camshaft and the cam are manufactured separately, and the rotation of the camshafts 30, 31 is driven by the stepping motor 4, which is separately arranged on both sides of the support frame 2, and the stepping motor 4 is connected to the cam through a coupling. Shafts 30, 31 are connected.

As shown in Figures 1 and 2, the Braille point display device displays Braille characters with 8 Braille contacts on one side; the Braille characters with 8 Braille contacts on one side are composed of eight contact pins 21, 22, 23, 24 , 25, 26, 27, 28 are respectively arranged in eight concave-convex points formed by the upper stop or the lower stop, and the four contact pins 21, 22, 23, 24 of each row are driven by a camshaft 31, and the other A column of four contact pins 25 , 26 , 27 , 28 is driven by another camshaft 30 .

Each cam 34, 35, 36, 37 installed on the camshaft 30 rotates once and is evenly arranged with 16 stop positions, the interval angle between adjacent stop positions is 22.5 degrees, and the stop positions are divided into upper stop or lower stop. The stop position refers to the position where the surface contour of the cam connects the contact pin when it is stationary, and the upper stop position is farther away from the cam center along the cam radial direction than the lower stop position. The contact pins 21, 22, 23, 24, 25, 26, 27, 28 are respectively at the eight concave-convex points formed by the upper stop or the lower stop.

When stop bit, each contact pin 21,22,23,24 above the cam 34,35,36,37 is in the lower stop position or the upper stop position, all four contact pins 21,22 in a stylus drive mechanism 1 , 23, 24 through the special arrangement of the stop positions on the respective cams 34, 35, 36, 37, so that the cams 34, 35, 36, 37 rotate one circle and the four contact pins 21, 22, 23, 24 correspond to a column of four 16 kinds of concave-convex dot arrangement of Braille contact, that is, Braille contact display.

In the two stylus driving mechanisms I, the two camshafts 30, 31 rotate for one revolution, respectively control the two stylus driving mechanisms I so that two rows of eight stylus 21, 22, 23, 24, 25, 26, 27, 28 together form 256 kinds of concave-convex dot arrangements, that is, Braille contact display, thereby realizing all combinations of 8 Braille contacts on one side of the display. The four cams 34, 35, 36, 37 are coaxially and fixedly mounted on the camshaft 31. During the synchronous rotation of the four cams, the arrangement of the stop positions on the four cams 34, 35, 36, 37 also remains fixed and rotates synchronously .

Thereby, the profile shapes of the four cams 34, 35, 36, 37 on the camshaft 31 have a fixed arrangement relationship, and the 16 stop positions of the camshaft 31 rotate one circle, and the 4 pieces of contact pins 21, 37, etc. 22, 23, 24 can form 16 different arrangements of Braille contacts. Similarly, the other four contact pins 25, 26, 27, 28 matched with the camshaft 30 also form 16 different arrangements of Braille contacts.

The lower end of the stylus keeps in contact with the outer contour of the cam, and the cam rotates to drive the stylus to move up and down in the stylus mounting hole. The movement law of the stylus depends on the outer contour of the cam and the rotation speed of the cam. When the lower end of the stylus is on the base circle of the cam, the stylus is at the bottom stop position, and when the lower end of the stylus is at the far rest profile of the cam, the stylus is at the upper stop position. When the stylus is at the bottom stop, the top of the stylus is 0.1 mm lower than the upper surface of the touchpad 1, forming a concave point of a Braille character; when the stylus is at the top stop, the top of the stylus is higher than the top of the touchpad 1 0.5 mm flat, forming a raised dot of Braille characters.

In the device of the present utility model, there are 8 compression springs in total, which are respectively enveloped outside the contact pins 21, 22, 23, 24, 25, 26, 27, and 28.

A Braille character is composed of eight stylus in the upper stop position or the lower stop position, and the corresponding convex points and concave points are arranged in four rows and two columns. Multiple "squares" can be arranged side by side to form a press The design calls for the required number of Braille displays.

The contact pin installation holes 5, 6, 7, 8, 9, 10, 11, 12 corresponding to the points of the Braille characters are set on the touch panel 1, and the size and arrangement form of the contact pin installation holes conform to the Braille characters to the Braille contact size and spacing requirements, each braille pointing mechanism is a "square" braille character.

The number of cams provided on each camshaft is half a "square", the spacing of the cams is equal and corresponds to the spacing of the contact pin mounting holes, and the maximum lift of the cams is slightly greater than the maximum height of the Braille contacts.

There are 16 stop positions in one rotation of the cam, and the interval angle of each stop position is 22.5 degrees. In order to make the blind person feel clearly distinguishable when touching the contacts, the position of each stop of the camshaft 30 and 31 should make each stylus be in the upper stop position or the lower stop position under the action of the cam.

Furthermore, the contours of the four cams on each camshaft must have strict shapes and relative fixed positions. This mechanism shows the most representative set of cam contour shapes and relative position relationships, as shown in Figure 4 , the 16 stop positions that the cam rotates for one revolution just make the Braille contacts formed by the four stylus driven by it complete 16 different arrangements. Its characteristic is that the cam 34 has a lift and a return stroke, wherein the eight adjacent stop positions are on the base circle, and the other eight adjacent stop positions are on the far rest contour, and the lift angle and the return angle are both 22.5 degrees; cam 35 has two lifts and return strokes, of which there are two adjacent stop positions and six adjacent stop positions on the base circle, and there are two adjacent stop positions and six adjacent stop positions The stop position is on the far rest contour, and the lift angle and return angle are both 22.5 degrees; the cam 36 has two lifts and return strokes, and four adjacent stop positions are set on the base circle, connected to the far rest contour. The adjacent three stop positions and five stop positions, the adjacent stop positions on the other part of the base circle are also connected to the adjacent three stop positions and five stop positions on the far rest contour, the lift angle and the return angle Both are 22.5 degrees; the cam 37 has three lifts and return strokes, of which there are two groups of two adjacent stop positions on the base circle, two groups of two adjacent stop positions on the far rest contour, and a group of four adjacent The stop position is located on the base circle and a set of four adjacent stop positions is located on the far rest contour, and the lift angle and return angle are both 22.5 degrees.

The characteristic performance of Fig. 4 is shown in Table 1. In Table 1, "1" represents the cam far rest profile, that is, the top stop, and "0" represents the base circle of the cam profile, that is, the bottom stop. The rows in Table 1 represent the cam profile point features corresponding to the 16 stop positions of the camshaft, and the columns in Table 1 represent the four cam profile point features corresponding to each stop position of the cam.

Correspondingly, the movement state of the stylus is also shown in Table 2. In Table 2, "●" represents the convex point of the Braille character, and "○" represents the concave point of the Braille character.

Table 1

Table 2

contact 1 ○ ○ ○ ○ ○ ○ ○ ○ ● ● ● ● ● ● ● ● contact 2 ● ● ○ ○ ● ● ○ ○ ○ ○ ○ ○ ● ● ● ● contact 3 ● ● ● ○ ○ ○ ○ ● ● ● ○ ○ ○ ○ ● ● contact 4 ● ○ ○ ○ ○ ● ● ● ● ○ ○ ● ● ○ ○ ●

It should be pointed out that in FIG. 4 and the corresponding Table 1, the four cams are arranged on the camshaft in sequence. 4( a ) to 4 ( d ) represent the stop position distributions of the cams 34 , 35 , 36 , and 37 , respectively. During specific implementation, the arrangement sequence of the cams 34, 35, 36, 37 on the camshaft can be interchanged arbitrarily, and the arrangement sequence of the formed Braille contacts also changes accordingly.

The above-mentioned specific embodiments are used to explain the utility model, rather than to limit the utility model. Within the spirit of the utility model and the protection scope of the claims, any modifications and changes made to the utility model all fall into the scope of the utility model. A new type of protection.

Claims (8)

1. a kind of braille point of four cam coaxials driving shows device, it is characterised in that: including two contact pilotage driving mechanisms (I), touching Template (1) and support frame (2)；The identical two column contact pilotage driving mechanism (I) of structure is installed between two support frames (2), touching Template (1) is mounted between two support frames (2)；Touch tablet (1) is equipped with contact pilotage mounting hole (5,6,7,8,9,10,11,12), Each contact pilotage driving mechanism (I) has four pieces of contact pilotages (21,22,23,24,25,26,27,28), two contact pilotage driving mechanisms (I) Eight pieces of contact pilotages (21,22,23,24,25,26,27,28) be mounted on touch tablet (1) contact pilotage mounting hole (5,6,7,8,9, 10,11,12) in.

2. a kind of braille point of four cam coaxials driving according to claim 1 shows device, it is characterised in that: two contact pilotages Driving mechanism (I) structure is identical, and each contact pilotage driving mechanism (I) includes four pieces of contact pilotages (21,22,23,24), four cams (34,35,36,37), a camshaft (31) and four compressed springs (29,38,39,40)；Four pieces of contact pilotages (21,22,23,24) Upper end is extend into the contact pilotage mounting hole (5,6,7,8) being mounted on touch tablet (1), and contact pilotage (21,22,23,24) and contact pilotage are pacified Fill clearance fit between hole (5,6,7,8)；Four pieces of contact pilotages (21,22,23,24) are arranged along a straight line arrangement, each contact pilotage (21,22, 23,24) on be set with compressed spring (29,38,39,40), four pieces of contact pilotage (21,22,23,24) lower ends respectively with four cams (34,35,36,37) upper surface profile remains contact in the case where compressed spring (29,38,39,40) act on, four cams (34, 35, it 36,37) is coaxially fixedly installed on camshaft (31), camshaft (31) is installed on support frame (2) through bearing (32)；Compression The upper end of spring is connected to contact pilotage mounting hole (5,6,7,8) hole surrounding end surfaces of touch tablet (1), and the lower end of compressed spring is fixed on On the step outstanding of contact pilotage lower end.

3. a kind of braille point of four cam coaxials driving according to claim 1 shows device, it is characterised in that: described two It is respectively equipped with stepper motor (4) on a support frame (2), the cam of stepper motor (4) output shaft and the contact pilotage driving mechanism (I) Axis (31) is coaxially connected, stepper motor (4) drive cam shaft (31) rotation, and then four cams of synchronous drive rotate synchronously.

4. a kind of braille point of four cam coaxials driving according to claim 1 shows device, it is characterized in that:

The braille point shows the Braille that device shows 8 braille contacts of side；The Braille of one 8 braille contacts of side The eight pieces of contact pilotages (21,22,23,24,25,26,27,28) arranged by four rows two are in upper position-arresting respectively or lower position-arresting is formed by eight A sags and crests are arranged to make up, and four contact pilotages (21,22,23,24) of each column are driven by a camshaft (31), and the four of another column A contact pilotage (25,26,27,28) is driven by another camshaft (30).

5. a kind of braille point of four cam coaxials driving according to claim 1 shows device, it is characterized in that:

Each cam (34,35,36,37) rotates a circle and is equipped with 16 stop positions uniformly at intervals, the interval between adjacent stop position Angle is 22.5 degree, and stop position is divided into upper position-arresting or lower position-arresting；In one contact pilotage driving mechanism (I) all four contact pilotages (21, 22,23,24) by the special arrangement of respective cam (34,35,36,37) on stop position, so that cam (34,35,36,37) revolves Circle 16 kinds of braille contacts of four braille contacts of column corresponding to lower four contact pilotages (21,22,23,24) are shown；

In two contact pilotage driving mechanisms (I), in two camshafts (30,31) rotate a circle, two contact pilotage driving machines are controlled respectively Structure (I) two column, eight contact pilotages (21,22,23,24,25,26,27,28) that 256 kinds of braille contacts be collectively formed to show, thus Realize whole combinations of display one side, 8 braille contacts.

6. a kind of braille point of four cam coaxials driving according to claim 1 shows device, it is characterized in that:

Four cams (34,35,36,37) are coaxially fixedly installed on camshaft (31), in four cam synchronous rotaries In the process, the stop position arrangement on four cams (34,35,36,37) is also kept fixed and synchronous rotary.

7. a kind of braille point of four cam coaxials driving according to claim 1 shows device, it is characterized in that:

In same contact pilotage driving mechanism (I), the stop position arrangement of four cams (34,35,36,37) is as follows:

In upper table, 0 indicates lower position-arresting, and 1 indicates upper position-arresting.

8. a kind of braille point of four cam coaxials driving according to claim 6 shows device, it is characterised in that: the cam Axis (31) and cam (34,35,36,37) are designed as a whole or are fixed together after separately manufactured.