CN1145725C

CN1145725C - Driving device of sewing machine

Info

Publication number: CN1145725C
Application number: CNB001082329A
Authority: CN
Inventors: 皆川忠义
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 1999-05-07
Filing date: 2000-04-30
Publication date: 2004-04-14
Anticipated expiration: 2020-04-30
Also published as: DE10022232B4; CN1273294A; TW491304U; KR20010049301A; KR100643417B1; DE10022232A1; JP2000317170A

Abstract

A sewing machine drive device allowing disposition of parts in a small space. This drive device of a sewing machine which has an upper shaft 2, a hook shaft 6 and a drive motor 34 to rotate one of the shafts is for rotating the hook shaft in the relatively opposite direction to the upper shaft. The upper shaft and the hook shaft are connected with a pair of sprockets 38, 52 and a pair of gears 44, 54. And one of the sprockets 52 and one of the gears 54 are integrally fixed to be rotatable around an eccentric shaft 46.

Description

The drive unit of Sewing machines

The present invention relates to a kind of drive unit of Sewing machines, particularly relate to a kind of drive unit that the industrial sewing machines of vertical rotary shuttle (DB shuttle) are arranged.

Be most commonly used in the industrial sewing machines with DB shuttle in the button holing sewing machine etc., the direction of rotation of last axle is different with the direction of rotation of shuttle axle, and the shuttle axle changes 2 and encloses during 1 of shank moves in circles.

Fig. 5 is the example in the past that drives the drive unit of going up axle and shuttle axle that uses sprocket wheel and synchronous belt.This drive unit is fixed on sprocket wheel 4 on the axle 2, and last spools 2 are connected with not shown electrical motor of sewing machine, and sprocket wheel 8 is fixed on the shuttle axle 6.

Be parallel to shuttle axle 6 and clamping and 2 axles 10,12 that shuttle axle 6 is provided with and be fixed on the not shown sewing machine frame, sprocket wheel 14,16 is rotatably installed in respectively on these axles 10,12.

Stride around synchronous belt 18 on each sprocket wheel 4,8,14,16.Sprocket wheel 8 is identical with the diameter of sprocket wheel 14,16, and the diameter that is fixed on the sprocket wheel 4 on the axle 2 is 2 times of other 3 sprocket wheel 8,14,16 diameters.

By formation like this, when last axle 2 changeed 1 circle, shuttle axle 6 was to changeing 2 circles with last 2 opposite direction.

Fig. 6 is the example in the past that drives the drive unit of going up axle and shuttle axle that uses gear.Last axle 2 and shuttle axle 6 are fixed on the bevel gear 20,22.The longitudinal axis 24 can be rotatably set between axle 2 and the shuttle axle 6, and the bevel gear 26 with bevel gear 22 engagements of last axle 2 is being fixed in the upper end of the longitudinal axis 24, and the bevel gear 28 that the bevel gear with shuttle axle 6 meshes is being fixed in the lower end.Bevel gear 20 is 2: 1 with the gear ratio of other bevel gears 22,26,28.

By configuration bevel gear 20,22,26,28 like this, when last axle 2 changeed 1 circle, shuttle axle 6 changeed 2 circles to opposite direction.

Yet the drive unit of example in the past shown in Figure 5 is because at 3 sprocket wheels of shuttle axle side use, so the space of component configuration must be very big.

In addition, the drive unit of example in the past shown in Figure 6 has the problem of noise, vibration owing to used bevel gear, and then must carry out step such as gear grinding, has increased operation.Have, the longitudinal axis 24 will insert in the hole 32 that forms on the sewing machine frame 30 again, the required precision height of hole 32 processing.

Therefore, the drive unit that the purpose of this invention is to provide the Sewing machines that a kind of component configuration space can be very little.

Even other purposes of the present invention provide a kind of use gear, do not need gear grinding etc. yet, can reduce the drive unit of the Sewing machines of noise, vibration etc.

For achieving the above object, according to the present invention, axle on having, the shuttle axle of fixed vertical rotary shuttle, with last drive motors that is connected with one of shuttle axle, and shuttle axle and last axle are connected in the drive unit of the Sewing machines that rotates in the opposite direction, fix the 1st sprocket wheel on the axle on described, can be the 2nd sprocket wheel of center rotation near being configured in paralleling to the axis on the described shuttle axle, stride the synchronous belt on the described the 1st and the 2nd sprocket wheel, can be integral the 1st gear of rotation with described the 2nd sprocket wheel, be fixed on the described shuttle axle and the 2nd gear that engages with the 1st gear, by described synchronous belt and pair of sprocket and a pair of gear, axle and shuttle axle are linked together.

In addition, described the 2nd sprocket wheel can be rotated to support on the eccentric shaft that is positioned on the sewing machine frame, by adjusting its eccentric direction, can realize adjusting the axle base of described a pair of gear.

Adopt the present invention, owing to be technical scheme 1 described structure, so part count minimizing compared with the past, the space that is used for arrangement components can be very little.

In addition, owing to adopt technical scheme 2 described structures, after assembling or the device adjusting stage,, the backlash of 2 gears can be adjusted to proper state by rotation eccentric axis.Therefore, there is no need to carry out gear grinding etc., also can reduce noise, vibration.

Fig. 1 is the front view of the present invention the 1st embodiment.

Fig. 2 is the schematic diagram of the major part structure of key diagram 1 embodiment, (A) is Figure 1A-A of sprocket wheel, synchronous belt and gear only to be shown to view, (B) is the view that eccentric shaft only is shown, and (C) is the vertical view that gear etc. is shown.

Fig. 3 is the front view of the present invention the 2nd embodiment.

Fig. 4 is the schematic diagram of the major part structure of key diagram 3 embodiment, (A) is Fig. 3 A-A of sprocket wheel, synchronous belt and gear only to be shown to view, (B) is the view that eccentric shaft only is shown, and (C) is the vertical view that gear etc. is shown.

Fig. 5 is the example in the past of drive unit that adopts the full circle swinging Sewing machines of DB shuttle, and the example that uses sprocket wheel and synchronous belt is shown.

Fig. 6 is another example in the past of drive unit that adopts the full circle swinging Sewing machines of DB shuttle, and the example that uses gear is shown.

Below, describe the drive unit of Sewing machines of the present invention with reference to the accompanying drawings in detail.

In Fig. 1,2, but the axle 2 of going up that links to each other with the motor 34 of Fig. 1 right-hand member by sewing machine frame 30 free rotary ground supportings by bearing 36.By screw 40 sprocket wheel 38 is fixed on going up on the axle 2 between motor 34 and the bearing 36.

Fixedly but the shuttle axle 6 of the not shown shuttle of Fig. 1 left end by sewing machine frame 30 free rotary ground supportings by bearing 42.

Gear 44 is fixed on Fig. 1 right-hand member of shuttle axle 6, and in its vicinity, the eccentric shaft 46 that is parallel to shuttle axle 6 is fixed on the

sewing machine frame

30,30 by

screw

48,50.

Shown in Fig. 2 (B), aforementioned eccentric shaft 46 is made of large-diameter portion 46a, minor diameter 46b and the eccentric part 46c between large-diameter portion 46a and minor diameter 46b, large-diameter portion 46a is consistent with the axle center of minor diameter 46b, the just axle center of eccentric part 46c biasing.Fit loosely on the eccentric part 46c of eccentric shaft 46 with aforesaid gears 44 meshed gears 54, sprocket wheel 52 is integral fixing with the left end of gear 54.Gear 54 is 2: 1 with the gear ratio of gear 44.

When being fixed on eccentric shaft 46 on the

sewing machine frame

30,30, by rotation eccentric axis 46, behind the eccentric direction of adjustment eccentric part 46c, can be fixing by screw 48,50.Because of this adjustment, can adjust shuttle axle 6 and eccentric shaft 46 the axle center, be gear 44 and the interval in the axle center of gear 54.

In illustrated example, from right-hand be the order that large-diameter portion 46a, the such diameter of eccentric part 46c, minor diameter 46b diminish successively, but the relation of each several part diameter and the object of the invention are irrelevant, can be arbitrary dimensions.

Sprocket

wheel

52,38 connects by the synchronous belt 56 of striding on it.

Because the drive unit of the Sewing machines of the 1st embodiment is a said structure, thus routine in the past different with Fig. 5, only use 1 sprocket wheel in shuttle axle one side, have again, because sprocket wheel 52 is integral with gear 54, the space that is used for arrangement components is very little.

In addition, after assembling or the device adjusting stage,, the flank of gear 44 and gear 54 after the gap is adjusted to proper state, can be fixed to eccentric shaft 46 on the sewing machine frame 30 by

screw

48,50 by rotation eccentric axis 46.There is no need to carry out gear grinding etc., also can reduce noise and vibration.

In Fig. 3 and the 2nd embodiment shown in Figure 4, the right-hand member of shuttle axle 6 links to each other with motor 134.The gear 154 that is contained on the eccentric shaft 46 is identical with the number of teeth of gear 144 on being fixed on shuttle axle 6.In addition, are half of diameter that are fixed on the sprocket wheel 38 on the axle 2 with the diameter of gear 154 all-in-one-piece sprocket wheels 152.Therefore, by these gears 144,154 and sprocket wheel 38,152 and synchronous belt 56, the rotation of shuttle axle 6 passes to axle 2, and still, last spools 2 rotary speed is half of shuttle axle 6, and its direction of rotation and shuttle axle 6 is opposite.

Because other members or parts are identical with the 1st embodiment, are marked with the sequence number identical with Fig. 1, and its explanation is omitted.

Because the drive unit of the Sewing machines of the 2nd embodiment is above-mentioned formation, can obtain the effect identical with the 1st embodiment.That is, only use 1 sprocket wheel in shuttle axle one side, have, because sprocket wheel 152 is integral with gear 154, the space that is used for arrangement components is very little.In addition, after assembling or the device adjusting stage, by rotation eccentric axis 46, the flank of gear 144 and gear 154 can be adjusted to proper state to the gap.Therefore, there is no need to carry out gear grinding etc., also can reduce noise and vibration.

Claims

1. the drive unit of a Sewing machines has: go up axle, and the shuttle axle of fixed vertical rotary shuttle, the drive motors that is connected with one of shuttle axle with last axle, and shuttle axle and last are connected in the opposite direction rotate, it is characterized in that,

Fix the 1st sprocket wheel on the axle on described, can be the 2nd sprocket wheel of center rotation near being configured in paralleling to the axis on the described shuttle axle, stride the synchronous belt on the described the 1st and the 2nd sprocket wheel, can be integral the 1st gear of rotation with described the 2nd sprocket wheel, be fixed on the described shuttle axle and with the 2nd gear of the 1st gears engaged, by described synchronous belt and pair of sprocket and a pair of gear, axle and shuttle axle are linked together.

2. according to the drive unit of the described Sewing machines of claim 1, it is characterized in that,

Described the 2nd sprocket wheel can be rotated to support on the eccentric shaft that is positioned on the sewing machine frame, by adjusting its eccentric direction, can adjust the axle base of described a pair of gear.