CN1117896C - Feed adjusting device for sewing machine - Google Patents

Abstract

A feed amount adjusting device of a sewing machine can adjust a cloth feed amount by small force continuously. There are provided a feed adjuster having a cam portion which changes a cloth feed amount of a feed dog by varying an inclination and reverses a cloth feeding direction of the feed dog by reversing an inclining direction, a feed adjusting screw having a front end to engage with the cam portion, supported on a sewing machine frame without being allowed to rotate and with being capable of advancing or retreating and provided with a female screw; and a feed adjusting shaft provided with a male screw to be screwed to the female screw and rotatably supported on the sewing machine frame. A feed dial is provided integrally with the adjusting shaft through a feed adjusting base fixed to the sewing machine frame and an axial position of the feed adjusting shaft by the feed adjusting base.

Description

The cloth feed amount adjusting device of Sewing machines

The present invention relates to a kind of cloth feed amount adjusting device of regulating cloth conveying capacity in the Sewing machines.

With reference to figure 4 (1), the conveying cloth apparatus in the Sewing machines is carried out diagrammatic illustration.

The fork-shaped work feed bar 1 that the upper end is connected with main shaft M, its lower end is connecting horizontal work feed bar 2.Horizontal work feed bar 2 is fixed on the horizontal cloth pushing shaft 3 that can rotate, and the crank 7 of horizontal cloth pushing shaft 3 by being fixed on the end is connected on the cloth pushing table 11 that has feed dog 10.The top of crank 7 is outwards outstanding.

The cloth pushing shaft up and down 6 of making crankmotion is parallel with horizontal cloth pushing shaft 3, and the crank 8 that is fixed on its end is provided with square die 9.Crank 8 is outstanding to a side direction.The fork-shaped portion that is provided with on this square die 9 and the described cloth pushing table 11 is chimeric.And, up and down cloth pushing shaft 6 by work feed bar 5 up and down be connected with the connecting rod of cloth feeding crank up and down 4 of main shaft M interlock.

Work feed adjuster 13 with cam part 13a, 13b, its upper end can rotate and is supported on the sewing machine stand by screw 12.Connecting crank 16, its upper end can rotate and is supported on the fork-shaped work feed bar 1 by screw 14, and the pars intermedia of work feed adjuster 13 can be rotated and be fixed on by screw 15 in its lower end simultaneously.

With respect to the rotating work feed control agent 17 of sewing machine frame, on the cardinal extremity of giving prominence to the machine frame outside of sewing, be fixed with operation dial 19, the cam part 13a or the 13b of the front end of a side and work feed adjuster 13 are chimeric in the sewing machine frame.Work feed control lever 18 in the sewing machine stand arranged outside, its back shaft is connected with the lower end of work feed adjuster 13, when work feed control lever 18 was carried out rotating operation, if work feed adjuster 13 is tilted significantly, the cloth feeding direction that will switch cloth made its work feed in the opposite direction.

In this cloth-feeding device, crankmotion with horizontal cloth pushing shaft 3 makes the front end of crank 7 do oscillating motion in the horizontal direction, make the front end of crank 8 do oscillating motion in vertical direction with the crankmotion of cloth pushing shaft 6 up and down, its synthetic result makes the feed dog 10 on the cloth pushing table 11 carry out the work feed motion with parallelogram or oval track.

If change the screw thread amount of being screwed into of work feed control agent 17, the front end of screw is relative and cam part 13a, 13b are free to go forward or back out, change the inclined degree at 13 pairs of screw 12 centers of work feed adjuster like this, thereby make the lower end of the connecting crank 16 that supports by work feed adjuster 13 produce displacement.Because the displacement of connecting crank 16 lower ends changes the component of the knee-action of fork-shaped work feed bar 1, that is, corresponding to the screw thread amount of being screwed into of work feed control agent 17, the cloth feed amount of anglec of rotation opposite joint one pin of the horizontal cloth pushing shaft 3 of decision is regulated.

Shown in Fig. 4 (2), work feed control agent 17 is a pin thread, engages with negative thread on the sewing machine stand F directly or indirectly.The most shrinkage pool 19a of portion that determine the scale position equally spaced are carved with at the back side of the work feed dial of fixing at its cardinal extremity 19 on its circumferencial direction.In addition, on sewing machine stand F, have relative hole Fa, in the Fa of this hole, spring 20 and metering needle 21 are housed with the described shrinkage pool 19a of portion.So, when rotating work feed dial 19, when metering needle 21 breaks away from the shrinkage pool 19a of portion, exert pressure to spring 20 in the back side of dial, metering needle 21 is pressed towards in the Fa of hole, allow dial 19 rotate, when metering needle 21 was chimeric with the desirable shrinkage pool 19a of portion, work feed dial 19 just was fixed on that position.

Though can determine the adjustable minimum anglec of rotation by the interval of the 19a of shrinkage pool portion, but work feed dial 19 is made of plastics usually, for proof strength just can not be done the interval of the 19a of shrinkage pool portion too little, institute is so that can not carry out small adjustment when actual making.If will make small adjustment become possibility, will make the work feed dial with firm metal, portion does very for a short time with shrinkage pool, or the diameter of increasing work feed dial, 2 metering needles will be set like this, also will make 2 row's shrinkage pool portions, even like this, also stepless adjustment can not be carried out, the countermeasure that solves root problem can not be become.

So, with regard to had do not use shrinkage pool and at the screw division of work feed control agent with leaf spring roof pressure structure, but because the pressure of leaf spring makes and need bigger strength when rotation work feed dial, its operability is just bad.

The cloth feed amount adjusting device that the purpose of this invention is to provide a kind of Sewing machines of the available less stepless adjustment cloth of strength conveying capacity.

The cloth feed amount adjusting device of Sewing machines of the present invention, be by the cloth feed amount of feed dog being changed according to changing the angle of inclination, carry out to opposite direction by the cloth feeding direction that makes feed dog to reciprocal inclination, and have a cam part (31a, work feed adjuster 31 31b), with the cam part (31a that has with work feed adjuster 31,31b) Dui Jie leading section 32a, that on sewing machine stand F, do not rotate and can advance and retreat work feed control agent 32, constitute with rotary work feed regulating shaft 33 on sewing machine stand F, and work feed control agent 32 and work feed regulating shaft 33 to be being threadedly engaged with, the structure that can advance and retreat according to the rotation work feed control agent 32 of work feed regulating shaft 33.

Work feed control agent 32 is the cylindrical body of its leading section 32a sealing, is negative thread 32b on the inner ring of cylindrical body, on the outer ring of work feed regulating shaft 33 be pin thread 33a (Fig. 1, Fig. 2).

By the work feed adjusting platform 35 that is fixed on the sewing machine stand F that work feed regulating shaft 33 and work feed dial 34 is integrated, regulate the axial position that platform 35 keeps work feed regulating shafts 33 by work feed.

Below accompanying drawing is carried out simple declaration.

Fig. 1 regulates the exploded perspective view of each parts of body for the work feed that constitutes the embodiment of the invention 1.

Fig. 2 is the key diagram of embodiments of the invention 1, the profile of (1) assembled state, and (2) constitute the side exploded view that work feed is regulated each parts of body, the graph of a relation of (3) sewing machine stand cylindrical portion and work feed control agent.

Fig. 3 is the key diagram of embodiments of the invention 2, the profile of (1) assembled state, and (2) constitute the side exploded view that work feed is regulated each parts of body, and (3) are its vertical view, the graph of a relation of (4) sewing machine stand cylindrical portion and work feed control agent.

Fig. 4 (1) constitutes the parts stereogram of cloth-feeding device in the past, the profile of (2) its cloth feed amount adjusting device.

Among the figure: 31. work feed adjusters, the 31a. cam part, the 31b. cam part, 32. work feed control agents, the 32a. leading section, the 32b. negative thread, 33. work feed regulating shafts, the 33a. pin thread, 34. work feed dials, 35. work feeds are regulated platform, F. sewing machine stand.

Below with reference to Fig. 1 and Fig. 2, the embodiment 1 of the cloth feed amount adjusting device of Sewing machines of the present invention is described.

Work feed adjuster 31 has and identical in the past structure, has cam part 31a and cam part 31b.Work feed control agent 32 cylindraceous has negative thread 32b in its tube.

The leading section 32a of work feed control agent 32 has the semi-round ball peripheral shape, and is chimeric with cam part 31a and cam part 31b slyness.

And, integrated at the rearward end and the cam part 32c of work feed control agent 32, planar portions 32c ', the 32c ' that the disk both sides are cut arranged on this cam part 32c.

Having the cross section that keeps work feed control agent 32 to advance and retreat and to be entrenched togather in addition on sewing machine stand F is oval-shaped hole Fb.In Fig. 2 (3), wall Fb ', the Fb ' of Fb both sides, hole has the butt joint plane that can slide on planar portions 32c ', the 32c ' of work feed control agent 32.Therefore, no matter rotate when still making work feed control agent 32 advance and retreat at work feed regulating shaft 33, work feed control agent 32 can not rotate.

On the periphery of work feed regulating shaft 33, has the pin thread 33a that engages with the negative thread 32b of work feed control agent 32.And, in the rearward end of work feed regulating shaft 33, and prevent to become one with flange part 33b, be screwed hole 33c toward the rear end again with opening.

The work feed that is fixed on the sewing machine stand F is regulated platform 35, is for the flange part 33b that pushes down work feed regulating shaft 33 does not throw off from sewing machine stand F, at central portion, has the through hole 35a that inserts work feed regulating shaft 33 rear ends.

Work feed regulating shaft 33, the hole 35a that work feed is regulated platform 35 is inserted in its upper end, ripple pad 37, packing ring 36 is combined as a whole with screw 38 and work feed dial 34 then.Packing ring 36 is in order to protect the parts of work feed dial 34 end faces, and ripple pad 37 then is the parts in order to prevent to become flexible.

Like this, regulate platform 35 by work feed and make work feed regulating shaft 33 and work feed dial 34 integrated, do not break away from so the flange part 33b of work feed regulating shaft 33 and work feed adjusting platform 35 are not only to be entrenched togather, and can assemble simply.In addition, on the opposite face of work feed regulating shaft 33 and work feed dial 34, have thin radial jog respectively, it can prevent loosening after integrated.

Cloth feed amount adjusting device with this spline structure when rotating work feed dial 34, just makes the work feed regulating shaft 33 that becomes one with it rotate.The work feed control agent 32 that engages with negative thread 32b with the pin thread 33a of this work feed regulating shaft 33 is because the rotation that its planar portions 32c and wall Fb ' have restricted spool, so advance in the Fb of the hole of Sewing machines or retreat along with the rotation of work feed regulating shaft 33 makes it.The cam part 31a of leading section 32a and work feed adjuster 31 and the distance of 31b change.Therefore, the inclination angle of variation work feed adjuster 31 can make the cloth feed amount of feed dog change.

Cloth feed amount adjusting device of the present invention with this spline structure, compare with cloth feed amount adjusting device in the past, work feed control agent 32 has increased by 1 parts, and owing to scribble butter between these parts and miscellaneous part, the hot-tempered sound of bird that shakes when the automatic return mechanism action of being carried out by o can significantly reduce.And, on the periphery of work feed control agent 32, there is not screw thread, almost be in chimerism on the total length with sewing machine stand cylindrical portion Fb, so the resistance to vibration height, the phenomenon of random work feed can not appear in Sewing machines when turning round.

Below, the embodiments of the invention in Fig. 32 are described.This device, basic identical with embodiment 1, at this, give same symbol to parts with identical function, only difference is described.

This cloth feed amount adjusting device and embodiment 1 different place is, is provided with pin thread 32d on the periphery of work feed control agent 32, and on the other hand, work feed regulating shaft 33 is a tubular, has negative thread 33d week in it.Since have pin thread 32d,, the position of the cam part 32c of work feed control agent 32 is portion therebetween, and the threaded portion of work feed control agent 32 and work feed regulating shaft 33 is than the weak point among the embodiment 1.

And the present invention has more than and is limited to the foregoing description and can does various changes, for example, replace and change positive and negative cloth feed amount cam part 31a, the structure of 31b one, forward stitch cam part and anti-work feed cam part can be set respectively, corresponding each cam part is provided with the work feed control agent of embodiment 1 and embodiment 2 and work feed regulating shaft etc. respectively, can regulate forward stitch amount and anti-cloth feed amount respectively like this.

More than the cloth feed amount adjusting device of Shuo Ming Sewing machines of the present invention can be carried out step-less adjustment to the conveying capacity of cloth with very little power, so easily cloth feed amount is carried out small adjustment, also can improve the quality of sewing product.But also the hot-tempered sound of the bird that shakes in automatic return mechanism when action is significantly reduced.

Have negative thread on the work feed control agent, when having pin thread on the work feed regulating shaft, be in the state chimeric with sewing machine stand on the almost total length of work feed control agent, so the resistance to vibration height, the phenomenon of random work feed can not appear in Sewing machines when turning round.

Regulate platform by work feed and make work feed regulating shaft and work feed dial integrated,, and assemble and also become simply so the work feed regulating shaft not only can not break away from sewing machine stand.

Claims (3)

1. the cloth feed amount adjusting device of a Sewing machines, it is characterized by, be by having by the work feed adjuster that changes the cam part that cloth feed amount that the inclination angle makes feed dog changes, has the work feed control agent that does not rotate and can advance and retreat at axis direction with respect to sewing machine stand that the fitting portion that docks with this cam part and cardinal extremity one side have the threaded portion with front end, with constitute with respect to the rotating work feed regulating shaft of sewing machine stand, work feed control agent and work feed regulating shaft to be being threadedly engaged with, and with the rotation of work feed regulating shaft the work feed control agent advanced and retreat along axis direction.

2. by the cloth feed amount adjusting device of the Sewing machines described in the claim 1, it is characterized by, the work feed control agent is a cylindrical body, has negative thread on week in it, has pin thread on the periphery of work feed regulating shaft.

3. press the cloth feed amount adjusting device of the Sewing machines described in the claim 1 or 2, it is characterized by, regulate platform and make work feed regulating shaft and work feed dial integrated by being fixed on work feed on the sewing machine stand, regulate the position of platform maintenance work feed regulating shaft on direction of principal axis by work feed.

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