CN101959398A

CN101959398A - Belt-type feeder

Info

Publication number: CN101959398A
Application number: CN2010102276821A
Authority: CN
Inventors: 谷口史之
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 2009-07-15
Filing date: 2010-07-14
Publication date: 2011-01-26
Anticipated expiration: 2030-07-14
Also published as: CN101959398B; JP5401190B2; JP2011023512A

Abstract

The invention provides a belt-type feeder which alleviates impact between ratchet teeth and a retaining pawl which rotate along the interval of chain wheels, and prevents tripping out of an electrical component. In the belt-type feeder, the retaining pawl is provided with a blocking surface formed by two planes crossed at a front end direction by a blocking part at the front end; and ratchet teeth form teeth surfaces at interval on a circumferential end surface of the ratchet; the teeth surfaces have two planes which are crossed on a central direction of a shaft of the front end; the angle of the blocking surface of the blocking part is larger than the angle of the teeth surface; and the blocking part is formed that: when blocking with the ratchet teeth at maximum, the distance from a vertex position crossed on the blocking surface to a reference position formed by connecting two intersecting points between the teeth surface and the circumferential end surface of the ratchet is 1/2 longer than the distance from the reference position to the vertex position crossed with the teeth surface.

Description

The belt feeder

Technical field

The present invention relates to a kind of belt feeder, it utilizes coaxial ratchet, make the sprocket wheel rotation of inserting pin in the feeding hole on equally spaced being arranged on the material containing band, Yi Bian make this intermittently feeding of material containing band, Yi Bian the electronic unit of being accommodated is supplied with to assigned position.

Background technology

For (lift-launch) electronic unit is installed, use erecting device (apparatus for mounting component) usually on the substrate that is positioned.

In this erecting device, for various electronic units are installed, a plurality of belt feeders that store different electronic units respectively are installed, supply with electronic unit to assigned position respectively.

For example as shown in Figure 1, belt feeder 10 is provided with: be in the parts supply unit 12 of assigned position, it is formed on leading section; Spool 14, it is installed in rearward end, and material containing band T in advance reels; And sprocket wheel 16, it is configured in leading section, drives by making sprocket wheel 16 rotations, can carry out index(ing) feed to above-mentioned material containing band T, supplies with the electronic unit in the accommodation bag (recess) that is housed in this material containing band T.

Material containing band T equally spaced forms feeding hole (not shown) along its length, in addition, as shown in Figure 3, equally spaced forms recess Ta along its length, disposes electronic unit P in recess Ta singly.In addition, material containing band T is provided with covering band Tb, with coating recess Ta, and this covering band Tb, before being delivered to above-mentioned parts supply unit 12, T is stripped from from the material containing band.

This belt feeder 10 as shown in Figure 2, if from the active force P of erecting device side, the leading section that knocks bar 18 towards last direction applies, then this to knock bar 18 be that rotation is swung at the center along clockwise direction with swinging axle 20.Thus, and knocking the 1st connecting rod 22 that bar 18 links, is that rotation is swung at the center in the counterclockwise direction with the axle 22a of cardinal extremity, and with the 2nd connecting rod 24 that the 1st connecting rod 22 links, be that rotation is swung at the center in the counterclockwise direction with rotating shaft 26.Thus, the ratchet pawl 28 that is fixed on the 2nd connecting rod 24 engages with the hook tooth (groove) 32 of ratchet 30, makes the rotation at a certain angle in the counterclockwise direction of this ratchet 30.

Sprocket wheel 16 is supported on the same axle with this ratchet 30, because sprocket wheel 16 is when utilizing active force P that the above-mentioned leading section that knocks bar 18 is driven upward, its rear end side oscillation to the stop position of retainer 34 butts, so via this ratchet 30, the rotational action that sprocket wheel 16 rotates along clockwise direction at a certain angle.

In the above-mentioned feeding hole on above-mentioned material containing band, the periphery that is embedded in sprocket wheel 16 is with the identical solid uniformly-spaced pin 16A of configuration, when sprocket wheel 16 carries out to above-mentioned anticlockwise rotational action, with the material containing band to direction of feed with a certain amount of feeding.

Therefore, by knocking the swing of bar 18 repeatedly, material containing band T is constantly with a certain amount of index(ing) feed that carries out, and the electronic unit P that is housed among the recess Ta of this material containing band T is supplied with to parts supply unit 12 successively.

Because when these parts are supplied with, need this recess Ta is located on parts supply unit 12 exactly, so be provided with lock pawl 36, it when carrying out index(ing) feed (rotational action) to sprocket wheel 16 at every turn, prevent the counter-rotating of hook tooth 32, and hook tooth 32 is positioned.

In addition, as Fig. 4 and shown in Figure 5, lock pawl 36 utilizes the counter clockwise direction pretension of not shown spring to Fig. 4, and the holding section 36A of its front end engages with the outer peripheral face of ratchet 30.In addition, when in the groove of the holding section of lock pawl 36 36A and the hook tooth 32 of ratchet 30, engaging, prevent the counter-rotating of sprocket wheel 16, and position.

In belt feeder 10 as noted above, there is following problems, promptly, because material containing band T intermittently moves to parts supply unit (absorption position) 12, so stopping or can applying vibration (impact) when mobile, make parts P from recess Ta, fly out, protrude, or make the positive and negative counter-rotating, can't utilize the adsorption mouth of erecting device to adsorb thus.

Therefore, in order when above-mentioned ratchet pawl and lock pawl move, not apply impact, utilize spring force adjustment.For example shown in record in the patent documentation 1, adopt following method, that is, and by utilizing spring with direction (direction that engage with the hook tooth) pretension of ratchet pawl to ratchet, thus, the impact of generation when when each feed motion, relaxing ratchet pawl and engaging with hook tooth.

Patent documentation 1: Japanese kokai publication hei 8-236986 communique

Summary of the invention

But above-mentioned spring can not be eliminated impact sometimes.

For example in the prior art, shown in Fig. 6 (A), the angle of 32 openings of 1 hook tooth of ratchet 30, promptly, 2 plane angulations that intersect on the axle center position (below, be called flank of tooth angle) be 75 °, on the other hand, shown in Fig. 6 (B), the angle of the holding section 36A of lock pawl 36, that is, form with it and compare less 72 ° in 2 toe angles that the plane became that intersect on the preceding extreme direction (below, be called the snap-latch surface angle).

Therefore, as shown in Figure 5, if sprocket wheel 16 rotations, then lock pawl 36 is shown in dotted line, temporarily is raised up on the circumferential end surfaces 30A of ratchet 30, then with the state shown in the solid line, engages with next hook tooth 32 once more.

As noted above, because basis

The relation of hook tooth flank of tooth angle＞lock pawl snap-latch surface angle, when rotating the intermittence that the holding section 36A that makes lock pawl 36 crosses the circumferential end surfaces 30A of ratchet 30, the smooth flank of tooth of hook tooth 32 can closely contact each other with the tabular surface of the holding section 36A of lock pawl 36, so each intermittently rotation can cause fierce the impact.Therefore, sometimes because the vibration that is produced makes parts fly out, protrude or positive and negative counter-rotating in accommodation bag from the recess of material containing band.

This point is also identical when the engaging of ratchet pawl and hook tooth.

Problem of the present invention is, a kind of belt feeder is provided, and it is by relaxing hook tooth and lock pawl and be accompanied by the rotation at intermittence of ratchet and to the impact of hook tooth, even to minimum electronic unit, also can supplying with to the parts supply unit with normal attitude stabilization ground.

The present invention is a kind of belt feeder, and it has: that can swing knocks bar; Ratchet, itself and the described bar that knocks link, and be rotatably supported, and a plurality of hook tooths of groove shape are set on periphery; Sprocket wheel, itself and described coaxial ratchet ground are supported, rotate every certain angle by the rotation of described ratchet; And tine, it has leading section, in the holding section that described leading section setting engages with the peripheral part of described ratchet, this holding section can engage with described hook tooth, described sprocket wheel is positioned on each turned position, rotation by described sprocket wheel, make the intermittently feeding of material containing band of accommodating electronic unit at certain intervals, this electronic unit is supplied with to the parts supply unit, it is characterized in that, the described holding section of described tine has by 2 snap-latch surfaces that the plane constitutes that intersect on preceding extreme direction, and, described hook tooth, equally spaced form on the circumferential end surfaces of described ratchet, have 2 flank of tooth that the plane constitutes that intersected at the axle center position by front end, the snap-latch surface angle that described snap-latch surface became of described holding section forms greatlyyer than flank of tooth angle that the described flank of tooth became.

In addition, the invention is characterized in, described tine is the lock pawl that is used for described ratchet location, described holding section forms, when engaging with the maximum of described hook tooth, the vertex position that intersects from described snap-latch surface is to the distance of the reference position that 2 intersection points between the circumferential end surfaces of the described flank of tooth and ratchet are linked, with from this reference position to the vertex position that this flank of tooth intersected till distance 1/2 compare longer.

The effect of invention

According to the present invention, because the holding section of the front end of lock pawl or ratchet pawl is set to, its snap-latch surface angle is compared greatly with the flank of tooth angle of hook tooth, position so can utilize the holding section to prevent the counter-rotating of hook tooth reliably, because on this basis, in this holding section to hook tooth (groove) when falling, a side of holding section contacts with the vertex point of hook tooth on one side on one side and slides, so when rotating each intermittence, impact when relaxing lock pawl or ratchet pawl and engaging can make the attitude stabilization of the electronic unit on the parts supply unit.

And, since with the degree of depth of the holding section of lock pawl be made as compare with 1/2 of the degree of depth of hook tooth darker, so can position reliably.

Description of drawings

Fig. 1 is the end view of the summary of expression belt feeder integral body.

Fig. 2 is the part end view that feed mechanism that expression is had existing belt feeder amplifies.

Fig. 3 is the fragmentary cross-sectional view that the material containing band is amplified in expression.

Fig. 4 is the end view of the relation of the existing sprocket wheel ratchet lock pawl of expression.

Fig. 5 is that expression is with the ratchet of the A scope of Fig. 4 and the key diagram of lock pawl amplification.

Fig. 6 is the key diagram of feature of the angle of expression angle of existing hook tooth and lock pawl front end.

Fig. 7 is the end view that sprocket wheel, ratchet and lock pawl that the belt feeder of an execution mode involved in the present invention had were extracted and amplified in expression.

Fig. 8 is the part end view that the feature of the relation of hook tooth and holding section is amplified in expression.

Fig. 9 is the key diagram of feature of the angle of the angle of hook tooth of expression present embodiment and lock pawl front end.

Figure 10 is that the feeding of expression sprocket wheel begins, the key diagram of feeding lock pawl action midway.

Figure 11 is the key diagram of the lock pawl action before the feeding of expression sprocket wheel has just finished.

Figure 12 is the key diagram that the lock pawl of the feeding end of sprocket wheel moves.

Figure 13 is the line chart of the effect of expression present embodiment.

Embodiment

Below, with reference to accompanying drawing, describe embodiments of the present invention in detail.

The belt feeder 10 of present embodiment and above-mentioned Fig. 1, device basic structure shown in Figure 2 are identical.Therefore, for identical part, omit detailed explanation.

In Fig. 7, Fig. 8, above-mentioned lock pawl 36 as tine, the holding section 40 of front end has the snap-latch surface 43 that is made of 2 planes 41,42 that intersect on preceding extreme direction, and, the hook tooth 32 of groove shape equally spaced forms on the circumferential end surfaces 30A of above-mentioned ratchet 30, has the flank of tooth 53 that 2 planes 51,52 of being intersected on the axle center position by front end constitute.

The holding section 40 of hook tooth 32 and lock pawl 36 front ends, shown in Fig. 9 (A), (B), the snap-latch surface angle [alpha] that above-mentioned snap-latch surface 43 is become forms the obtuse angle, and the flank of tooth angle beta that the above-mentioned flank of tooth 53 is become forms acute angle, snap-latch surface angle [alpha]＞flank of tooth angle beta.

As concrete example, the flank of tooth angle beta of hook tooth 32 is 70 °, and the snap-latch surface angle [alpha] of the front end holding section 40 of lock pawl 36 is 108 °.But,, be not limited to this certainly as concrete angle [alpha], β.

According to from the feeding till maximum engaging is when engage with next tooth is maximum, feeding midway, each process status of feeding end, the effect of present embodiment is described.

At first, when feeding shown in Figure 10 began, the holding section 40 of lock pawl 36 engaged with the inside of hook tooth 32 the biglyyest, was in the state of dotted line (Figure 10 (B)).If make ratchet 30 to Figure 10 (A) rotation counterclockwise from this state, then lock pawl 36 is crossed the summit 32A of hook tooth 32, become the feeding state midway shown in the straight line (Figure 10 (B)), the front end of lock pawl 36 moves on one side in the last slip of outer peripheral face (circumferential end surfaces) 30A of this ratchet 30 on one side.

As shown in figure 11, if the front end of the lock pawl 36 that slides on outer peripheral face 30A, by summit (bight) 32b of next hook tooth 32N, then front end falls to hook tooth 32N.At this moment, a side 36c of the sprocket wheel direction of rotation side of this lock pawl 36, Yi Bian slide contiguously with respect to above-mentioned summit 32b point, Yi Bian fall (Figure 11 (B) arrow mark) to the lowest point.

Then, as shown in figure 12, a side 36c engages (Figure 12 (B)) with hook tooth 32N with wedge-like on one side with respect to the fallen lock pawl 36 in summit 32b slip one side, stops with maximum fastening state once more.

As noted above, according to present embodiment, because engage with hook tooth 32 at lock pawl 36, when breaking away from, the side of lock pawl 36 and the vertex point of hook tooth 32 slide contiguously, so can not apply impact, can not apply impact yet to the sprocket wheel 16 that is supported on the same axle with ratchet 30 to ratchet 30.

Among Figure 13 (A), (B), show contrastively at prior art and the present embodiment shown in above-mentioned Fig. 4 etc., the result of the vibrational waveform of the impact that actual measurement produces when being equivalent to the engaging of lock pawl 36, as can be known: in the present embodiment, impact significantly and relax.

In addition, the holding section 40 of above-mentioned lock pawl 36 forms, when the maximum with above-mentioned hook tooth 32 shown in Figure 8 engages, the vertex position 44 that is intersected from above-mentioned snap-latch surface 43, distance to the reference position 54 that 2 intersection points between the circumferential end surfaces 30A of the above-mentioned flank of tooth 53 and ratchet are linked is h, and 1/2 of the depth H till this distance h and the vertex position 55 that is intersected from this reference position 54 to this flank of tooth 53 is compared darker.

If making both is the relation of this degree of depth, can guarantee that then holding section 40 engages with wedge-like reliably with respect to hook tooth 32, and the bigger power of effect, so can be used as the counter-rotating that prevents ratchet 30 (sprocket wheel 16), and the retainer of location works exactly.

Therefore, according to present embodiment, can bring into play fully on the basis of retainer function at lock pawl 36, impact when the hook tooth 32 of minimizing ratchet 30 engages, prevent midway in feeding, minimum parts are jumped out from the accommodation bag of cutting out strip T or are reversed in accommodation bag, make the attitude stabilization of the electronic unit on the parts supply unit.

In addition, in the present embodiment, lock pawl has been described, but, has also may be embodied as ratchet pawl as tine as tine.

Claims

1. belt feeder, it has:

That can swing knocks bar;

Ratchet, itself and the described bar that knocks link, and be rotatably supported, and a plurality of hook tooths of groove shape are set on periphery;

Sprocket wheel, itself and described coaxial ratchet ground are supported, rotate every certain angle by the rotation of described ratchet; And

Tine, it has leading section, and in the holding section that described leading section setting engages with the peripheral part of described ratchet, this holding section can engage with described hook tooth, described sprocket wheel is positioned on each turned position,

By the rotation of described sprocket wheel, make the intermittently feeding of material containing band of accommodating electronic unit at certain intervals, this electronic unit is supplied with to the parts supply unit,

It is characterized in that,

The described holding section of described tine has by 2 snap-latch surfaces that the plane constitutes that intersect on preceding extreme direction, and,

Described hook tooth equally spaced forms on the circumferential end surfaces of described ratchet, has 2 flank of tooth that the plane constitutes that intersected at the axle center position by front end,

The snap-latch surface angle that described snap-latch surface became of described holding section forms greatlyyer than flank of tooth angle that the described flank of tooth became.

2. belt feeder according to claim 1 is characterized in that,

Described tine is the lock pawl that is used for described ratchet location.

3. belt feeder according to claim 2 is characterized in that,

Described holding section forms, when engaging with the maximum of described hook tooth, the vertex position that intersects from described snap-latch surface is to the distance of the reference position that 2 intersection points between the circumferential end surfaces of the described flank of tooth and ratchet are linked, with from this reference position to the vertex position that this flank of tooth intersected till distance 1/2 compare longer.