CN1101868C

CN1101868C - Flywheel for sewing machine

Info

Publication number: CN1101868C
Application number: CN00102203A
Authority: CN
Inventors: 铃木一郎; 伊藤等
Original assignee: Heavy Machinery Co ltd
Current assignee: Heavy Machinery Co ltd; Juki Corp
Priority date: 1999-02-04
Filing date: 2000-02-04
Publication date: 2003-02-19
Anticipated expiration: 2020-02-04
Also published as: CN1262351A; TW446025U; JP2000225282A; DE20001597U1; KR100560980B1; KR20000076595A; JP4307608B2

Abstract

A handwheel or motor pulley for sewing machine, prevents the tangles of the thread of a spool with the motor pulley or the flywheel. A hand rotation part 57 of the handwheel 58 is exposed at the outer side of the belt cover 62; a boss part 56 is at the inner side of the belt cover; and a groove (1) is formed between the hand rotation part and the boss part.

Description

Be used for the flywheel on the Sewing machines

Technical field

The present invention relates to be installed in the flywheel on the machine spindle.

Background technology

In industrial sewing machines, use the spindle drive systems of two kinds of forms, indirect drive systems and Direct Driving System; In indirect drive systems, main shaft is rotated by the motor that is arranged on the head outside, and in Direct Driving System, main shaft is rotated by the motor that is installed in the head.

At first, with reference to Fig. 7 and 8, indirect drive systems is made an explanation.

Main shaft 54 rotatably is supported on by bearing 53 on the frame 52 of head 51, and head 51 is installed on the workbench 50, and main shaft 54 is along the longitudinal extension of frame 52.The right-hand member of main shaft 54 in Fig. 8 is fixed on the flywheel 58.The hub portion 56 of flywheel 58 has formed V-belt groove 55 on its circumference, the diameter of manual pulley 57 is greater than the diameter of wheel hub 56.Belt wheel 60 is fixed on the driving shaft 59a of motor 59, and described motor 59 is installed under the workbench 50.V-belt 61 is around the trough of belt 55 on belt wheel 60 and the flywheel 58.The rotation of motor 59 rotates flywheel 58 by V-belt 61.

Then, make an explanation with reference to Fig. 9 and 10 pairs of Direct Driving System.In this drive system, motor 59 is installed in the frame 52.Motor 59 is fixed on the flywheel 58, and described flywheel 58 has hub portion 56 and manual pulley 57 shown in Figure 10 right-hand member; The left end of motor 59 is by motor shaft 63 direct and spindle coupled.The rotation of motor 59 is rotated flywheel 58 and main shaft 54.

Above-mentioned two kinds of drive systems all have flywheel 58 in the outside of frame 52, and are with covering 62 or the extended end 52a of frame to be used to cover hub portion 56, its objective is that protection operator's hand prevents injured.Gapped S between the manual pulley 57 that exposes and covering 62 or frame end 52a.

By this structure, being rotated in the narrow space between flywheel 58 and the covering 62 of the flywheel 58 that is driven by motor 59 produced negative pressure, and this makes air flow from the described space of manual pulley 57 side direction.This air flow is drawing the line T of leaving behind from the bobbin (not shown) and is entering described space by gap S, because columniform hub portion 56 has smooth surface, thereby line may be tangled around hub portion 56, V-belt 61, main shaft 54 or motor shaft 63.

Under the situation about taking place of not knowing to tangle, proceed sewing operation and can produce a large amount of scrap wire T, remove the line that tangles and require a great deal of time, thereby reduced sewing efficiency.

When the line that tangles enters gap between flywheel 58 end faces and the bearing face 53, in the time of perhaps in the gap between main shaft 54 and bearing 53 cavitys, will increase the friction between the described surface, cause bigger moment of torsion, this may cause main shaft 54 locked or burn motor 59.

Japanese utility model application No.Hei 8-76 discloses improvement as described below.

With reference to Figure 11, the annular section 60a outstanding from a side surface of electrical machine belt pulley 60 has otch 60b.Otch 60b makes this shape, and its back edge with respect to the direction of rotation shown in the arrow Y is basically perpendicular to annular section 60a one end, and another edge is towards the place ahead inclination of direction of rotation.

The line T that is suspended to the outer surface of annular section 60a slides on sloping edge, and the back edge that arrives otch 60b also engages (Figure 12), along with the rotation of belt wheel 60, be wrapped in annular section 60a around.This motion has prevented the entanglement of line and motor shaft (not shown).

Figure 13 shows another kind of form.In the side of belt wheel 60, be provided with projection 60c along annular section 60a, rather than above-mentioned otch 60b.

As shown in figure 14, the effect of projection 60c is identical with otch 60b, also is for anti-principal vertical line T and motor shaft entanglement.

However, the improvement of Japanese publication No.Hei 8-76 still can make line T and the hub portion 56 or V-belt 61 entanglement of suspension, though it has prevented the entanglement of line and main shaft.So just produced a problem, under the situation of not knowing to tangle, continued sewing and can produce a large amount of scrap wire T, must the cost plenty of time remove the line that tangles, thereby reduce sewing efficiency.

Summary of the invention

Therefore, the purpose of this invention is to provide the flywheel of using on a kind of Sewing machines, it has prevented the entanglement of line.

In order to address the above problem, the invention provides a kind of flywheel that is used on the Sewing machines, described flywheel is fixed on the rotating shaft, and have the hub portion and the manual pulley that exposes that are covered by a covering, wherein, formed at least one groove on the circumference between manual pulley and the hub portion, described groove has smooth surface.

Preferably, described groove forms on a toroid.

In a specific structure, described flute profile is helically shaped.

In the structure that another is more preferably, relative with the gap between covering end and the manual pulley, on the circumference of flywheel, form groove.

According to the present invention, even when being suspended on the hub portion under the alignment, entering in the described groove when rooved face slides, and the air-flow that produced by flywheel rotation of line is when pulling to hub side, can prevent that also the alignment hub side from moving by the side edge surfaces of groove, therefore, can prevent principal vertical line become entangled in hub portion around.As a result, the present invention has saved the scrap wire loss, and the time of removing the entanglement line, thereby has improved the efficient of sewing operation.

Description of drawings

Below accompanying drawing is carried out briefly bright.

Fig. 1 is the perspective view of first embodiment of the invention;

Fig. 2 is flywheel applications with the first embodiment of the invention cutaway view during to indirect drive systems;

Fig. 3 is flywheel applications with the first embodiment of the invention side view during to indirect drive systems;

Fig. 4 is flywheel applications with the first embodiment of the invention cutaway view during to Direct Driving System;

Fig. 5 is flywheel applications with the second embodiment of the invention cutaway view during to indirect drive systems;

Fig. 6 is flywheel applications with the third embodiment of the invention cutaway view during to Direct Driving System;

Fig. 7 is the front view by traditional Sewing machines of indirect drive systems driving;

Fig. 8 is the cutaway view of Sewing machines traditional in the indirect drive systems;

Fig. 9 is the front view by traditional Sewing machines of Direct Driving System driving;

Figure 10 is the cutaway view of flywheel part traditional in the Direct Driving System;

Figure 11 is the perspective view of an example of a traditional electrical machine belt pulley;

Figure 12 is the left side view of electrical machine belt pulley shown in Figure 11;

Figure 13 is the perspective view of another example of traditional electrical machine belt pulley;

Figure 14 is the left side view of the electrical machine belt pulley of Figure 13.

Detailed description of preferred embodiment

Be described below with reference to Fig. 1-6 pair embodiments of the invention.With components identical in the description of prior art with identical title and reference number.

Fig. 1-3 has represented an embodiment of indirect drive systems.Formed cannelure 1 on the circumference of flywheel 58, this cannelure is relative with gap S, that is to say, between manual pulley 57 and band covering 62.The surface of groove 1 has lower friction.And groove 1 should have enough degree of depth, thereby can not tangle line T, because too dark groove 1 may make line tangle.

When the end of a thread from the bobbin (not shown) enters gap S, be suspended on the wire casing 1 on the hub portion 56, as shown in Figure 3.In this state, turning clockwise of flywheel 58 can not engage with the line around the flywheel, because groove 1 has slidably smooth surface.

In addition, even under the effect of the air-flow that produces between covering 62 and the hub portion 56, line is pulled to frame 52 sides (left side among Fig. 2), and line T can not shift out from groove 1 under the effect on the surface, the left side of groove 1 yet, thereby can not tangle with hub portion 56.

Fig. 4 is illustrated in an embodiment in the Direct Driving System.

Adopt with indirect drive systems in identical structure, groove 1 forms on the circumference of flywheel 58, described groove 1 is relative with gap S, that is to say, between manual pulley 57 and frame end 52a.When line T head from bobbin (not shown), when entering gap S, the line that is suspended on the hub portion 56 has fallen in the groove 1, as shown in Figure 3.

As in indirect drive systems, the line end that falls into groove 1 can not be wrapped in flywheel around because groove 1 has slidingsurface.

In addition, though when line T under the effect of the air-flow that produces between stander end 52a and the hub portion 56 by to the Zola time (as shown in Figure 4), under the effect on surface, groove 1 left side, line T can not shift out from groove 1 yet, thereby can not tangle with hub portion 56.

In said structure, groove 1 can be many grooves as shown in Figure 5.

As another kind of form, groove 1 can be spiral slot 1a as shown in Figure 6, and its cross section is an arc.

Spiral slot 1a forms this structure, when flywheel 58 rotates, because its screw action line T moves to manual pulley.Therefore, when flywheel 58 rotates, fall into the line T of groove 1a, slide on rooved face because groove 1a has lower friction, and progressively move to manual pulley 57 along groove 1a.

In addition, even the air-flow traction that line T is produced between frame end 52a or band covering 62 and hub portion 56, line T can not be moved to the left in Fig. 6 under screw action yet and run out of outside the groove 1a, therefore can not tangle with hub portion 56.

The present invention also can be applicable to be fixed in the indirect drive systems electrical machine belt pulley on the machine drive motors.

The invention is not restricted to the foregoing description, within the scope of the invention various modification can be arranged.

As mentioned above, according to the present invention, even when being suspended on the hub portion under the alignment, falling into groove and when on rooved face, sliding, and when under the effect of the air-flow that flywheel rotation produces, being tending towards being pulled to wheel hub, line can not move to hub side under the effect of the side edge surface of groove, thereby has prevented that it is wrapped in tangling of wheel hub on every side or with V-belt.As a result, consumption has brought economic benefit thereby the present invention has saved scrap wire, has saved and has removed the time of entanglement line, and then improved sewing efficiency.

In addition, because line does not tangle with hub portion, thus prevented the entanglement of line and main shaft or motor shaft, thus prevented that entanglement owing to line from making the moment of torsion increase make motor locked or burn.

Claims

1. be used for the flywheel on the Sewing machines, comprise the hub portion and the manual pulley that exposes that are covered with by a covering, on the circumference of hub portion, formed at least one groove, it is characterized in that, described groove has the side edge surfaces that is used for anti-principal vertical line reach and smooth, smooth lower surface, and described lower surface is parallel to the bearing of trend of described hub portion.

2. flywheel according to claim 1 is characterized in that described groove forms an annular.

3. flywheel according to claim 1 is characterized in that, described flute profile spirality formula.

4. flywheel according to claim 1 is characterized in that, described groove on the circumference of flywheel, relative with the gap between described covering and the manual pulley.