A structure of equal diameter symmetrical distribution of photosensitive pairs of tubes in a thumbwheel encoder

Abstract

The present invention discloses a structure of equal-diameter symmetrical distribution of photosensitive pairs of tubes in a fingerwheel encoder, comprising: a fixed base, which has a base bottom plate, a front side vertical plate and a rear side vertical plate, and the front side vertical plate is formed with a vertical plate through hole; a roller assembly, which has a grating turntable, a roller component, a roller shaft and a connecting sleeve; a receiving tube vertical plate, which is placed on the front side of the front side vertical plate, and the receiving tube vertical plate has a photosensitive receiving tube; and a transmitting tube vertical plate, which is placed on the rear side of the front side vertical plate, and the transmitting tube vertical plate has a photosensitive transmitting tube; the number of the photosensitive receiving tube, the vertical plate through hole and the photosensitive transmitting tube is two, and they are respectively arranged on the circumference of the same diameter. The beneficial effect of the present invention is that the two photosensitive pairs of tubes are distributed on the circumference of the same diameter, and the encoding function is realized by the angle difference of the two photosensitive pairs of tubes.

Description

Technical Field

[0001] The invention relates to the field of thumbwheel encoders, in particular to a structure in which photosensitive pairs of tubes are symmetrically distributed with equal diameters in a thumbwheel encoder. Background Art

[0002] At present, the two pairs of photosensitive tubes in the traditional thumbwheel encoder are distributed on concentric rings of different diameters. The two pairs of photosensitive tubes are turned on and off in a certain order by misaligning the shapes of the inner and outer layers of the grating to complete the encoding function. The above structure causes the thumbwheel encoder to be large in size, the grating shape to be complex, and the response time of the two pairs of photosensitive tubes to be asynchronous. In order to reduce the size of the thumbwheel encoder, simplify the grating shape, and synchronize the response time of the two pairs of photosensitive tubes, it is urgent to design a thumbwheel encoder photosensitive tube symmetrical distribution structure with equal diameters. Summary of the invention

[0003] The object of the present invention is to solve the problems in the prior art and to provide a novel structure of equal-diameter symmetrical distribution of photosensitive pairs of tubes in a fingerwheel encoder.

[0004] In order to achieve this purpose, the technical solution of the present invention is as follows: a photosensitive pair tube equal diameter symmetrical distribution structure in a finger wheel encoder, comprising:

[0005] A fixed base, comprising a base bottom plate, a front side vertical plate and a rear side vertical plate, the base bottom plate extending front and rear, the front end of the base bottom plate forming an upper step and a lower step arranged in sequence from front to rear, wherein the upper step is higher than the lower step, the front side vertical plate extending upward from the top surface of the upper step, the rear side vertical plate extending upward from the top surface of the rear end of the base bottom plate, the front side vertical plate and the rear side vertical plate facing each other front and rear, and a vertical plate through hole formed on the front side vertical plate;

[0006] A roller assembly, comprising a grating rotating disk, a roller component, a roller shaft and a connecting sleeve, wherein the grating rotating disk, the roller component, the roller shaft and the connecting sleeve have a common first axis and the first axis extends in a front-to-back direction, the grating rotating disk is located at the front side of the roller component, the connecting sleeve surrounds the outer circumference of the roller shaft and is disposed between the grating rotating disk and the roller component, and the connecting sleeve is used to fixedly connect the grating rotating disk and the roller component;

[0007] A receiving tube stand plate, which is placed on the front side of the front side stand plate, and the receiving tube stand plate has a photosensitive receiving tube; and

[0008] A transmitting tube stand plate, which is placed on the rear side of the front side stand plate, and has a photosensitive transmitting tube on the transmitting tube stand plate;

[0009] The number of the photosensitive receiving tube, the vertical plate through hole and the photosensitive emitting tube are all two, which are arranged on respective circumferences of the same diameter. The photosensitive receiving tube, the vertical plate through hole and the photosensitive emitting tube have a common second axis and the second axis extends front to back. The photosensitive receiving tube and the photosensitive emitting tube are opposite to each other front to back.

[0010] As a preferred solution for the equal-diameter symmetrical distribution structure of photosensitive tubes in a fingerwheel encoder, the grating rotating disk is composed of four sector-shaped parts evenly arranged along the circumference and a circumferential gap is left between two adjacent sector-shaped parts.

[0011] As a preferred solution for the equal-diameter symmetrical distribution structure of photosensitive tubes in a fingerwheel encoder, a U-shaped notch opening upward is formed on the front side vertical plate, and an elongated waist hole extending in the up-down direction is formed on the rear side vertical plate. The roller shaft is placed between the front side vertical plate and the rear side vertical plate, and the front end of the roller shaft extends forward to the inside of the U-shaped notch, and the rear end of the roller shaft can extend backward to the inside of the elongated waist hole.

[0012] As a preferred solution for the equal-diameter symmetrical distribution structure of the photosensitive tubes in a fingerwheel encoder, a vertical plate connecting ear is also formed on the front vertical plate, the vertical plate connecting ear is perpendicular to the front vertical plate, a connecting hole is formed on the vertical plate connecting ear, a connected hole is formed at the front end of the roller shaft, the connecting hole and the connected hole have a common third axis and the third axis extends in the left-right or up-down direction, and a connecting pin is provided between the connecting hole and the connected hole.

[0013] As a preferred solution for the equal-diameter symmetrical distribution structure of photosensitive tubes in a fingerwheel encoder, the receiving tube vertical plate also has a first hole for the receiving tube, the transmitting tube vertical plate also has a first hole for the transmitting tube, the upper step is formed with an upper step through hole, the first hole for the receiving tube, the upper step through hole and the first hole for the transmitting tube have a common fourth axis and the fourth axis extends in the front-to-back direction, and connecting bolts are provided between the first hole for the receiving tube, the upper step through hole and the first hole for the transmitting tube.

[0014] As a preferred solution for the equal-diameter symmetrical distribution structure of photosensitive tubes in a fingerwheel encoder, the receiving tube vertical plate also has a receiving tube second hole, the transmitting tube vertical plate also has a transmitting tube second hole, and a vertical plate through hole is formed on the front side vertical plate. The receiving tube second hole, the vertical plate through hole and the transmitting tube second hole have a common fifth axis and the fifth axis extends along the front-to-back direction. The vertical plate through hole has a pin inside, and the pin is thin at the front two ends and thick in the middle. The front end of the pin extends to the inside of the second hole of the receiving tube and the front end of the pin is matched with the axial hole of the second hole of the receiving tube, and the rear end of the pin extends to the inside of the second hole of the transmitting tube and the rear end of the pin is matched with the axial hole of the second hole of the transmitting tube.

[0015] Compared with the prior art, the beneficial effects of the present invention are at least: 1. Two photosensitive receiving tubes and two photosensitive emitting tubes constitute two groups of photosensitive pairs of tubes, and the angle difference of the two groups of photosensitive pairs of tubes on the circumference of the same diameter is used to realize the encoding function; 2. The grating turntable is in the shape of a four-leaf clover, which can not only reduce the size of the fingerwheel encoder, but also simplify the grating shape, and enable the two pairs of photosensitive pairs of tubes to respond synchronously; 3. A vertical plate through hole is provided on the front vertical plate, so that the high and low level conversion time of the photosensitive pairs of tubes is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the present invention (assembled state).

[0017] Figure 2 It is a schematic structural diagram of an embodiment of the present invention (exploded state).

[0018] Figure 3 It is a schematic structural diagram of a fixed base in one embodiment of the present invention.

[0019] Figure 4 Schematic diagram of the structure of a roller component in one embodiment of the present invention.

[0020] Figure 5 Schematic diagram of the structure of a grating turntable in one embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below by means of specific embodiments connected with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] See also Figure 1 and 2The figure shows a symmetrical distribution structure of photosensitive tubes with equal diameters in a finger wheel encoder. The symmetrical distribution structure is mainly composed of a fixed base 1, a roller assembly 2, a receiving tube stand plate 3 and a transmitting tube stand plate 4.

[0023] Combination Figure 3 The fixed base 1 has a base bottom plate 11, a front side vertical plate 12 and a rear side vertical plate 13. The base bottom plate 11 extends forward and backward. The front end of the base bottom plate 11 is formed with an upper step 111 and a lower step 112 arranged in sequence from front to back. Among them, the upper step 111 is higher than the lower step 112. The front side vertical plate 12 extends upward from the top surface of the upper step 111. The rear side vertical plate 13 extends upward from the top surface of the rear end of the base bottom plate 11. The front side vertical plate 12 and the rear side vertical plate 13 are opposite to each other front and back. A U-shaped notch 120 opening upward is formed on the front side vertical plate 12. A long waist hole 130 extending in the up-down direction is formed on the rear side vertical plate 13.

[0024] See also Figure 4 The roller assembly 2 comprises a grating rotating disk 21, a roller component 22, a roller rotating shaft 23 and a connecting sleeve 24. The grating rotating disk 21, the roller component 22, the roller rotating shaft 23 and the connecting sleeve 24 have a common first axis and the first axis extends in the front-rear direction.

[0025] The grating rotating disk 21 is located at the front side of the roller component 22. In this embodiment, see Figure 5 The grating rotating disk 21 is shaped like a four-leaf clover, and is composed of four sector-shaped parts evenly arranged along the circumference, and a circumferential gap is left between two adjacent sector-shaped parts. The circumferential gap allows light to pass through.

[0026] The roller shaft 23 is disposed between the front side vertical plate 12 and the rear side vertical plate 13. The front end of the roller shaft 23 extends forward to the inside of the U-shaped notch 120. The rear end of the roller shaft 23 can extend backward to the inside of the long waist hole 130.

[0027] The connecting sleeve 24 surrounds the outer circumference of the roller shaft 23 and is placed between the grating disc 21 and the roller component 22. The connecting sleeve 24 is used to fix the grating disc 21 and the roller component 22. Furthermore, the grating disc 21, the roller component 22 and the connecting sleeve 24 form a whole and can rotate with the roller shaft 23.

[0028] A vertical plate connecting ear 121 is also formed on the front vertical plate 12. The vertical plate connecting ear 121 is perpendicular to the front vertical plate 12. In this embodiment, the number of the vertical plate connecting ears 121 is two, which are arranged opposite to each other. The vertical plate connecting ear 121 extends forward from the front of the front vertical plate 12. A connecting hole 1210 is formed on the vertical plate connecting ear 121. A connected hole 230 is formed at the front end of the roller shaft 23. The connecting hole 1210 and the connected hole 230 have a common third axis and the third axis extends in the left-right (or up-down) direction. A connecting pin 5 is provided between the connecting hole 1210 and the connected hole 230. When an external force in a downward (upward) direction acts on the roller component 22, the connecting pin 5 forms a fulcrum, and the roller shaft 23 can be flipped downward (upward) by the connecting pin 5.

[0029] The front side vertical plate 12 is further formed with a vertical plate through hole 122 .

[0030] The receiving tube stand plate 3 is placed at the front side of the front side stand plate 12. The receiving tube stand plate 3 has a photosensitive receiving tube 31, a first receiving tube hole and a second receiving tube hole.

[0031] The transmitting tube stand plate 4 is disposed at the rear side of the front side stand plate 12. The transmitting tube stand plate 4 is provided with a photosensitive transmitting tube 41, a first transmitting tube hole and a second transmitting tube hole.

[0032] In this embodiment, the number of the photosensitive receiving tube 31, the number of the vertical plate through hole 122 and the number of the photosensitive emitting tube 41 are all two, and they are respectively arranged on respective circumferences of the same diameter.

[0033] The photosensitive receiving tube 31, the vertical plate through hole 122 and the photosensitive emitting tube 41 have a common second axis and the second axis extends forward and backward. The photosensitive receiving tube 31 is opposite to the photosensitive emitting tube 41. The specific optical path is as follows: the light of the photosensitive emitting tube 41 is emitted forward, passes through the vertical plate through hole 122, and reaches the photosensitive receiving tube 31. When the photosensitive receiving tube 31 receives the light, it is in the on state. When the photosensitive receiving tube 31 does not receive the light, it is in the off state. When the grating turntable 21 is rotated, the vertical plate through hole 122 (the two holes have an angle difference on the circumference of the same diameter) is sequentially blocked by the fan-shaped part of the grating turntable 21, and the photosensitive receiving tube 31 continuously switches between disconnection and connection, outputs the corresponding high-level or low-level signal, and completes the encoding function.

[0034] The first hole of the receiving tube and the first hole of the transmitting tube are both non-metallized holes. The first hole of the receiving tube and the first hole of the transmitting tube are respectively located at the front and rear sides of the upper step 111. An upper step through hole 124 is formed on the upper step 111. The first hole of the receiving tube, the upper step through hole 124 and the first hole of the transmitting tube have a common fourth axis and the fourth axis extends in the front-to-back direction. There are connecting bolts 7 between the first hole of the receiving tube, the upper step through hole 124 and the first hole of the transmitting tube. Thereby, the receiving tube stand plate 3, the upper step 111 and the transmitting tube stand plate 4 are fixedly connected.

[0035] The second hole of the receiving tube and the second hole of the transmitting tube are both metalized holes. The second hole of the receiving tube and the second hole of the transmitting tube are respectively located at the front and rear sides of the front side vertical plate 12. A vertical plate through hole 123 is formed on the front side vertical plate 12. The second hole of the receiving tube, the vertical plate through hole 123 and the second hole of the transmitting tube have a common fifth axis and the fifth axis extends in the front-to-back direction. A plug pin 6 is provided inside the vertical plate through hole 123. The plug pin 6 is thin at the front and rear ends and thick in the middle. The front end of the plug pin 6 extends to the inside of the second hole of the receiving tube and the front end of the plug pin 6 is matched with the axial hole of the second hole of the receiving tube. The rear end of the plug pin 6 extends to the inside of the second hole of the transmitting tube and the rear end of the plug pin is matched with the axial hole of the second hole of the transmitting tube.

[0036] It should be noted that, in other embodiments, the positions of the receiving tube stand plate 3 and the transmitting tube stand plate 4 can be interchanged.

[0037] The above only expresses the implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A photosensitive pair tube symmetrical distribution structure with equal diameters in a fingerwheel encoder, characterized in that: Contains: A fixed base, comprising a base bottom plate, a front side vertical plate and a rear side vertical plate, the base bottom plate extending front and rear, the front end of the base bottom plate forming an upper step and a lower step arranged in sequence from front to rear, wherein the upper step is higher than the lower step, the front side vertical plate extending upward from the top surface of the upper step, the rear side vertical plate extending upward from the top surface of the rear end of the base bottom plate, the front side vertical plate and the rear side vertical plate facing each other front and rear, and a vertical plate through hole formed on the front side vertical plate; A roller assembly, comprising a grating rotating disk, a roller component, a roller shaft and a connecting sleeve, wherein the grating rotating disk, the roller component, the roller shaft and the connecting sleeve have a common first axis and the first axis extends in a front-to-back direction, the grating rotating disk is located at the front side of the roller component, the connecting sleeve surrounds the outer circumference of the roller shaft and is disposed between the grating rotating disk and the roller component, and the connecting sleeve is used to fixedly connect the grating rotating disk and the roller component; A receiving tube stand plate, which is placed on the front side of the front side stand plate, and has a photosensitive receiving tube; and A transmitting tube stand plate, which is placed on the rear side of the front side stand plate, and has a photosensitive transmitting tube on the transmitting tube stand plate; The number of the photosensitive receiving tube, the vertical plate through hole and the photosensitive emitting tube are all two, which are respectively arranged on respective circumferences of the same diameter. The photosensitive receiving tube, the vertical plate through hole and the photosensitive emitting tube have a common second axis and the second axis extends front to back. The photosensitive receiving tube and the photosensitive emitting tube are opposite to each other front to back. The front side vertical plate is formed with a U-shaped notch opening upward, the rear side vertical plate is formed with an elongated waist hole extending in the up-down direction, the roller shaft is placed between the front side vertical plate and the rear side vertical plate, the front end of the roller shaft extends forward to the inside of the U-shaped notch, and the rear end of the roller shaft can extend backward to the inside of the elongated waist hole; The front side vertical plate is also formed with a vertical plate connecting ear, the vertical plate connecting ear and the front side vertical plate are perpendicular to each other, a connecting hole is formed on the vertical plate connecting ear, a connected hole is formed at the front end of the roller shaft, the connecting hole and the connected hole have a common third axis and the third axis extends in the left-right or up-down direction, and a connecting pin is provided between the connecting hole and the connected hole; The receiving tube vertical plate also has a first hole for the receiving tube, the launching tube vertical plate also has a first hole for the launching tube, the upper step step is formed with an upper step through hole, the first hole for the receiving tube, the upper step through hole and the first hole for the launching tube have a common fourth axis and the fourth axis extends in the front-to-back direction, and a connecting bolt is provided between the first hole for the receiving tube, the upper step through hole and the first hole for the launching tube; The receiving tube vertical plate also has a second receiving tube hole, the transmitting tube vertical plate also has a second transmitting tube hole, a vertical plate through hole is formed on the front side vertical plate, the receiving tube second hole, the vertical plate through hole and the transmitting tube second hole have a common fifth axis and the fifth axis extends along the front-to-back direction, the vertical plate through hole has a plug pin inside, the plug pin is thin at the front two ends and thick in the middle, the front end of the plug pin extends to the inside of the second hole of the receiving tube and the front end of the plug pin is matched with the axial hole of the second hole of the receiving tube, the rear end of the plug pin extends to the inside of the second hole of the transmitting tube and the rear end of the plug pin is matched with the axial hole of the second hole of the transmitting tube.

2. The photosensitive tubes of the thumbwheel encoder are symmetrically distributed in equal diameters according to claim 1, characterized in that: The grating rotating disk consists of four sector-shaped parts evenly arranged along the circumference, and a circumferential gap is left between two adjacent sector-shaped parts.

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