CN101882741B

CN101882741B - Improved structure of movable arm and brush

Info

Publication number: CN101882741B
Application number: CN2010101875873A
Authority: CN
Inventors: 金志良
Original assignee: DONGGUAN CHANGTAIER ELECTRONICS Co Ltd
Current assignee: DONGGUAN CHANGTAIER ELECTRONICS Co Ltd
Priority date: 2010-05-31
Filing date: 2010-05-31
Publication date: 2012-03-14
Anticipated expiration: 2030-05-31
Also published as: CN101882741A

Abstract

The invention relates to an improved structure of a movable arm and a brush, which relates to the field of electronic components. The structure comprises the movable arm and the brush, wherein the movable arm comprises a seat plate and an axis through hole, and the axis through hole passes through the seat plate; the brush comprises a plastic covered part, a bend part, an elastic arm and a brush head, and the plastic covered part, the bend part, the elastic arm and the brush head are integrated into a whole structure; the plastic covered part is covered in the seat plate of the movable arm; the bend part connects the plastic covered part and the elastic arm, and bends the elastic arm to the plastic covered part, i.e. to the seat plate of the movable arm; the elastic arm comprises a main arm and a branch arm, and the main arm is a rectangular ring-shaped body; the brush head presses on the free end of the main arm and the free end of the branch arm; and the main arm of the elastic arm is lengthened so that the free end of the main arm extends to or out of the other edge of the seat plate of the movable arm. The structure has the beneficial effects that the precision of the structure and the overall size consistency of the product are improved; and after the product passes through the high temperature in assembly, the brush is not loosened and stably contacts with a circuit wafer so as to output stable signals and improve the electrical performance.

Description

The structure-improved of a kind of swing arm and brush

Technical field

The present invention relates to field of electronic components, the swing arm that especially on rotary encoder and potentiometer, uses and the structure-improved of brush.

Background technology

On rotary encoder and the potentiometer; One swing arm (also claiming rotor) with the axle center rotation is arranged; Brush (also claiming brush) is set on it, and the circuit contacts on brush and its corresponding electrical circuits sheet (claiming contact chip again) is when swing arm rotates with the axle center; Brush also rotates with the break-make contact relation of the circuit on change and the circuit wafer or resistance size thereupon, forms signal output.

In the prior art, brush is general fixes (Fig. 1) with swing arm employing riveting.Produce following drawback thus:

The first, riveting fixedly tightness is inconsistent, causes brush unstable with contacting of circuit wafer, influences the stability of signal.

Second; Riveting is fixing to be needed through high temperature, because the existence of expanding with heat and contract with cold and the thermal deformation coefficient of different materials differ, shrinking and inconsistent phenomenon can appear later in high temperature; It is loosening that brush is occurred; Make brush with the synchronism variation that axle rotates, perhaps make brush unstable, electric property and useful life are affected with contacting of circuit wafer.

The 3rd; Like Fig. 2, Fig. 3 and shown in Figure 4, the influence of high temperature during riveted joint, brush assembling are riveted behind high temperature than before the brush assembling; The height of the brush of its brush to swing arm seat board bottom surface (being the height of the brush of brush) descends 50%; The height change of the brush of brush is big, also causes the brush of brush to occur becoming flexible with contacting of circuit wafer, causes brush unstable with contacting of circuit wafer.

In addition, in the prior art, the elastic arm of brush is too short.The length of the elastic arm of so-called brush is riveting point or the fulcrum distance to the brush of brush.Consult Fig. 2, Fig. 3 and Fig. 4; When the height change of the brush of brush is identical,, make the elastic arm of brush and the big variation of angle generation on swing arm seat board plane because the length of the elastic arm of brush is too short; Also cause brush loosening easily; Brush is when rotating with the axle center simultaneously, and the elastic arm of brush rises and falls big, also causes brush unstable with contacting of circuit wafer.

Summary of the invention

The present invention is intended to overcome the above-mentioned deficiency of prior art, releases the structure-improved of a kind of swing arm and brush, the high conformity of structure before and after its assembling; Assembly precision is high; Brush can not produce loosening phenomenon, the contact stabilization of brush and circuit wafer, the signal stabilization of output; Electric property improves, and extend useful life.

For this reason, the structure-improved of a kind of swing arm of the present invention and brush adopts following technical scheme:

The structure-improved of structure a kind of swing arm of the present invention and brush comprises swing arm and brush, and swing arm comprises seat board and axle center via hole, and the axle center via hole passes seat board; Brush comprises plastic bag, bending part, elastic arm and brush, and plastic bag, bending part, elastic arm and brush are one-body molded to be overall structure; Plastic bag is plastic in the seat board of swing arm; Bending part is connected plastic bag and elastic arm is folded to the seat board that plastic bag promptly is folded to swing arm with elastic arm; Elastic arm comprises principal arm and divides support arm that principal arm is microscler round body; Brush is compressed on principal arm and divides the free end of support arm.

Technique scheme is further set forth:

The length of the principal arm of elastic arm is lengthened to another edge that the free termination that makes principal arm extended or stretched out the seat board of swing arm.

Divide support arm to be arranged at the inner ring of the said principal arm of microscler round.

The present invention compares with prior art, and its beneficial effect is: the plastic bag of one of which, brush is plastic in the seat board of swing arm, and the precision of structure is improved, and product overall dimensions consistency improves; Product is after through the high temperature in the assembling, and brush does not have loosening phenomenon, makes brush and circuit wafer contact stabilization, causes the stable signal of output, thereby improves electric property.Two, brush comprises plastic bag, bending part, elastic arm and brush, and plastic bag is plastic in the seat board of swing arm, makes the elastic arm of lengthening brush become possibility, thus the structural obstacle that exists when having cleared away the elastic arm of lengthening brush; Bending part becomes fulcrum, the elastic arm of brush lengthening (increasing more than 50% than riveting fixed structure brachium) (referring to Figure 12, Figure 13 and Figure 14, and contrast with Fig. 2, Fig. 3 and Fig. 4); On the one hand; Make under the identical situation of the height slippage of brush of brush through assembling, because the elastic arm of brush lengthening, the variation of the subtended angle of the elastic arm of brush is little; The fluctuating that is the elastic arm of brush diminishes; Thereby the elasticity of the elastic arm of brush is changed not quite, and avoided the brush of brush to occur becoming flexible with contacting of circuit wafer, also be beneficial to and improve brush and circuit wafer stability in contact; On the other hand, even change to some extent when the height of brush brush when rotating with the axle center, but that the elastic arm of brush rises and falls is little, has also improved brush and circuit wafer stability in contact.Three, of many uses, be applicable to encoder and potentiometer, be beneficial to the electric ability ability and the useful life of improving encoder and potentiometer.Its four, be beneficial to the automatic assembly line operation, the present invention makes the assembling of swing arm and brush become very easy continuously.

Description of drawings

Fig. 1 is a fixedly sketch map of prior art center brush and swing arm riveting.

Before Fig. 2 is the fixing assembling of prior art center brush and swing arm riveting, the elasticity brachium of brush and the high-level schematic of brush.

After Fig. 3 is the fixing assembling of prior art center brush and swing arm riveting, the elasticity brachium of brush and the high-level schematic of brush.

Fig. 4 is that prior art center brush and swing arm riveting are fixed assembling behind high temperature, the elasticity brachium of brush and the high-level schematic of brush.

Fig. 5 is a schematic perspective view of the present invention.

Fig. 6 for the plastic bag of brush of the present invention plastic in swing arm seat board but do not have the sketch map of bending.

Fig. 7 is the vertical view of Fig. 6 and clockwise rotates 45 degree.

Fig. 8 is the strip sketch map of the present invention in producing continuously.

Fig. 9 for the present invention at one of continuous flow procedure---plastic sketch map.

Figure 10 is that the present invention is at two of continuous production production process---brush bending sketch map.

Figure 11 for the present invention in that three of continuous production production process---profile is cut off sketch map.

Before Figure 12 is brush of the present invention and swing arm assembling, the elasticity brachium of brush and the high-level schematic of brush.

After Figure 13 is brush of the present invention and swing arm assembling, the elasticity brachium of brush and the high-level schematic of brush.

Figure 14 is that brush of the present invention and swing arm are assembled behind high temperature the elasticity brachium of brush and the high-level schematic of brush.

Among the figure: 1, swing arm; 11, seat board; 12, axle center via hole; 2, brush; 21, plastic bag; 22, bending part; 23, elastic arm; 231, principal arm; 232, divide support arm; 24, brush; D, elastic arm length; The height of the brush of H, brush; 3, riveting post; 4, connect material; 5, strip.

Embodiment

Below, in conjunction with accompanying drawing, introduce embodiment of the present invention.

Like Fig. 5, Fig. 6 and shown in Figure 7, the structure-improved of a kind of swing arm of the present invention and brush comprises swing arm 1 and brush 2, and swing arm 1 comprises seat board 11 and axle center via hole 12, and axle center via hole 12 passes seat board 11; Brush 2 comprises plastic bag 21, bending part 22, elastic arm 23 and brush 24, and plastic bag 21, bending part 22, elastic arm 23 and brush 24 are one-body molded to be overall structure; Plastic bag 21 is plastic in the seat board 11 of swing arm 1, the concrete moulding of plastic bag 21 and the seat board of swing arm 1 11 couplings; Bending part 22 is connected plastic bag 21 and elastic arm 23 is folded to the seat board 11 that plastic bag 21 promptly is folded to swing arm 1 with elastic arm 23; Elastic arm 23 comprises principal arm 231 and divides support arm 232, and principal arm 231 is microscler round body, as like ellipticity etc.; Brush 24 is compressed on principal arm 231 and divides the free end of support arm 232, and wherein the free end of principal arm 23 1 is opened the system slot, and this slot is around free end, and this slot is also opened brush and made and is a plurality of contacts arranged side by side simultaneously, plays and improves the effect that contacts with circuit wafer.For encoder, in general, the brush 24 on the principal arm 231 makes the coding conducting, and dividing support arm 232 is common port.

The length of the principal arm 231 of elastic arm 23 is lengthened to another edge that the free termination that makes principal arm 231 extended or stretched out the seat board 11 of swing arm 1.

Divide support arm 232 to be arranged at the inner ring of the said principal arm 231 of microscler round.

Fig. 8, Fig. 9, Figure 10 and Figure 11 have illustrated production process of the present invention.

In process of production; As shown in Figure 8, the strip 5 of making brush, the strip 5 of brush forms (generally by central processing unit control) by the sheet metal band through die stamping; And through connecting material 4 gets up to become brush with brush 2 consecutives one by one strip 5; In case of necessity, also to carry out electroplating processes, make the conductivity of brush 2 better strip 5.

After the strip 5 of brush was made, the tinuous production that just can get into the cut-out of moulding plastic---brush bending---profile was produced continuously.

As shown in Figure 9, promptly moulding is plastic.On machine-tool, through grinding tool, and by central processing unit control moulding swing arm 1 and simultaneously that the plastic bag 21 (part that dotted line encloses among Fig. 8) of brush 2 is plastic in the seat board 11 of swing arm 1.

Shown in figure 10, i.e. brush bending.The bending part 22 of brush 2 is folded to the top of the seat board 11 of swing arm 1 through manipulator.

Shown in figure 11, promptly profile is cut off.Through manipulator the connection material 4 on the strip 5 is cut away, just obtain the finished product of swing arm of the present invention and brush.

The above only is preferred embodiment of the present invention, is not that technical scope of the present invention is done any restriction.The technical staff of the industry; Under the inspiration of present technique scheme; Can make some distortion and revise, like the concrete data of the height H of the brush of elasticity arm lengths D and brush among Fig. 2, Fig. 3, Fig. 4, Figure 12, Figure 13 and Figure 14, as just an example; Be convenient to comparison directly perceived, make the technical spirit of elastic arm 23 lengthenings of brush 2 with explanation the present invention.Every foundation technical spirit of the present invention all still belongs in the scope of technical scheme of the present invention above any modification, equivalent variations and modification that embodiment did.

Claims

1. the structure-improved of swing arm and brush comprises swing arm (1) and brush (2), and swing arm (1) comprises seat board (11) and axle center via hole (12), and axle center via hole (12) passes seat board (11); It is characterized in that: brush (2) comprises plastic bag (21), bending part (22), elastic arm (23) and brush (24), and plastic bag (21), bending part (22), elastic arm (23) and brush (24) are one-body molded to be overall structure; In the plastic seat board of plastic bag (21) (11) in swing arm (1); Bending part (22) is connected plastic bag (21) and elastic arm (23) is folded to the seat board (11) that plastic bag (21) promptly is folded to swing arm (1) with elastic arm (23); Elastic arm (23) comprises principal arm (231) and divides support arm (232) that principal arm (231) is microscler round body; Brush (24) is compressed on principal arm (231) and divides the free end of support arm (232).

2. the structure-improved of a kind of swing arm according to claim 1 and brush is characterized in that: the length of the principal arm (231) of elastic arm (23) is lengthened to another edge that the free end that makes principal arm (231) extended or stretched out the seat board (11) of swing arm (1).

3. the structure-improved of a kind of swing arm according to claim 1 and brush is characterized in that: divide support arm (232) to be arranged at the inner ring of the said principal arm (231) of microscler round.