CN1167849A - Sewing machine with drive motor holding dog - Google Patents

Abstract

The present invention provides a sewing machine comprising a shell with a bottom board and a drive motor fixed on the shell, the shaft of the drive motor connects with main shaft drive arranged on the bottom board by means of a connector, the invention is characterized in that the motor (12) is internally fixed on a U type holing dog mounting with the bottom board (1) and bridging a crater on the crater (22) of the bottom board (1), the fixing position (20, 21) of the motor (12) on the holding dog (19) is positioned on a plane E of barycenter (S) of the motor extending in crossrange of the motor shaft (23) or on an area like this, that is the area extends from the barycenter (S) to the back direction connector (8) of the motor (12).

Description

The Sewing machines that has the drive motors holding dog

The present invention relates to a kind of Sewing machines as described in the preamble by claim 1, it has a drive motors that is fixed on the Sewing machines housing.

Disclosed by U.S. Pat-PS 2 223 315, have by base plate, in the Sewing machines of the housing that bearing and arm are formed, one places the main shaft in the base plate to link to each other with the axle of drive motors by a coupling.Motor is fixed on the bearing of Sewing machines housing with the deflection support that electric machine casing is tightened in by a side.At this, because motor band certain distance ground stretches in the base plate side, therefore there is such danger on the one hand, promptly fracture, and the accurate aligning of motor is hindered owing to impact force action makes support; And on the other hand, because the instability of motor is hung, when Sewing machines moved, the slight imbalance of motor will make its swing, and Sewing machines is passed in this swing interference greatly.

The objective of the invention is to, drive motors is placed the protected state that is difficult for swing.This task will solve by the feature in the claim 1.

In a depression that motor is contained in base plate, make it be in a kind of protected state as same flush type motor, thus, can protect it to avoid impacting and other infringement to a great extent.Other measure, be about to motor be fixed on its center of gravity zone in or on the electric machine support one see from coupling and to be on the center of gravity position over there, guaranteed the stable arrangement of motor, thus, prevented the generation of swinging and further propagated on the Sewing machines.At last, the U-shaped holding dog of cross-over connection base plate depression plays a kind of stable effect of strengthening the base plate weakened owing to depression that reaches.Because holding dog is from the bottom clamping motor, it constitutes in addition to the following protection of motor and simultaneously as the post angle of Sewing machines and as to the supporting from the cover plate of following closed bottom.

By the described measure of claim 2, promptly holding dog is the part that becomes whole with base plate, has avoided holding dog and to be tightened on the base plate as an additional separating component manufacturing.In addition, consider because depression causes the reduction of the shape rigidity of base plate to form the advantage on the casting technique, especially go into and when caving in asymmetric the setting thus elongated unstable dividing plate of a wall formation of base plate when the asymmetric peace of motor.The holding dog that together makes during by the casting base plate, this wallboard can be cast out by no shifting ground, therefore can cancel correction work subsequently.In addition, do not have such danger, promptly wallboard is rolled over bad after casting or even is fractureed.At last, also there is the advantage of processing technology aspect, do not need special supporting man-hour because wallboard adds in smear metal.

Claim 3 provides a kind of Extended forms with advantage of motor bearing, promptly on the one hand, makes motor be fixed on projection on the holding dog away from forming at least one on the bearing (ball) cover of coupling; And on the other hand, supported at three point is fixed motor without a doubt.

With reference to the embodiment shown in the figure the present invention is further explained.

The partial sectional view of Fig. 1 Sewing machines;

The side view of Fig. 2 Sewing machines bottom and institute's installation motor;

The underneath side elevation view of Fig. 3 Sewing machines base plate;

The sectional view of Fig. 4 electric machine support.

The housing of Sewing machines is made up of a base plate 1, a bearing 2 and an arm 3, and this arm 3 is transited into head 4 gradually.

In base plate 1, be provided with the main shaft 5 of a Sewing machines.Main shaft 5 is fixed in the axle sleeve 6 of rotatable first coupler component 7 that is placed in the coupling 8 in the base plate 1 with the one end.Toothed belt wheel 9 is made in coupler component 7 its outsides.Toothed belt wheel 9 is parts that are used for driving the Toothed Belts Gearing mechanism 11 of arm axle 10.

Motor 12 is used for driving Sewing machines, and its housing 13 is made up of a preceding end shield 14, a rear head 15 and a mid portion 16.Be provided with one and motor 12 integrant, disclosed and so position sensors not shown further below the protective cover 17 on rear head 15.On the lower end of rear head 15, form a projection 18.By this projection 18, motor 12 is tightened on the U-shaped holding dog 19, wherein, two fixed positions 20,21 is arranged, and they have relative spacing.At this, motor 12 a depression of base plate 1 locate stretch in 22.

Second coupler component 24 of foregoing coupling 8 is fixed on the motor shaft 23.The ground interlocking mutually that coincide of two coupler component 7 and 24 shapes, wherein, the coupler component 7 that matches with main shaft 5 constitutes approximate inner gear ring, and constitutes approximate external tooth wheel rim with coupler component 24 that motor shaft 23 matches.Coupler component 24 peripheries are sprayed with thermoplastic polyurethane (Polyurethan), thus, form the involucrum body 25 that shelly surrounds its connection element, and it fills the gap between the connection element of two coupler component 7,24.

The axle sleeve 6 of coupler component 7 partly protrudes from the end of main shaft 5.Motor shaft 23 extends through coupler component 24 and embeds by this way in the axle sleeve 6.Motor shaft 23 is by O type ring 26 relative axle sleeve 6 radial supports that are located at its end.

Holding dog 19 is and 1 one-tenth whole part of the base plate that makes by casting.Its cross-over connection recess 22 also makes other section 28 connect together (Fig. 3) adjacent with recess 22 of wallboard 27 and base plate 1 of the relative thin of base plate 1.At this, holding dog 19 is from following clamping motor 12 and utilize the bottom surface of its horizontal stretching to constitute the suspension column of Sewing machines.Sewing machines also has at least two other suspension columns 29,30, and they are located at the other end of base plate 1.If a cover plate from following closed bottom 1 is set, then suspension column 29,30 and holding dog 19 usefulness are done the supporting to cover plate.

As can be seen from Figure 4, the fixed position 20,21 of motor 12 on holding dog 19 is positioned at such zone, and promptly the center of gravity S from motor 12 stretches to the direction of 8 one ends of coupling dorsad of motor 12.In other words, the center of gravity S of motor 12 is between supporting place of motor shaft 23 with respect to main shaft 5 that two fixed positions 20,21 and O type ring 26 risen.In this way, reach the stable supported at three point to motor 12, this helps avoid the swing of unbalanced motor 12.

Claims (3)

1. Sewing machines, it has housing and a drive motors that is fixed on the housing of a band base plate, the axle of this drive motors is connected with a main shaft drives that is placed in the base plate by a coupling, it is characterized in that, motor (12) is fixed on this recess of cross-over connection in the recess (22) of base plate (1), on the U-shaped holding dog (19) that is fixed together with base plate (1), the fixed position (20 of motor (12) on holding dog (19), 21) be positioned at the plane (E) that extends substantially transversely to motor (12) center of gravity (S) that motor shaft (23) stretches or be positioned at such zone, promptly should the zone from the direction stretching, extension of center of gravity S to (8) one ends of coupling dorsad of motor (12).

2. according to the described Sewing machines of claim 1, it is characterized in that holding dog (19) is the part that becomes whole with base plate (1).

3. according to claim 1 or 2 described Sewing machiness, wherein, motor (12) has a housing (13) that has two end shields (14,15), it is characterized in that, be fixed on two the relative position spaced (20,21) on the holding dog (19) away from the end shield (15) of coupling (8) protrudes from the projection (18) on the electric machine casing (13) by at least one, these two fixed positions (20,21) connect the three-point support that the same motor shaft (23) that is located in the attachment areas constitutes motor (12) together with respect to the support such as the O type ring (26) of machine shaft (5).

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