CN1088771C

CN1088771C - Sewing machine with closed needle bar and pedal bar driving system

Info

Publication number: CN1088771C
Application number: CN97103338A
Authority: CN
Inventors: 赫克纳·克里斯托弗
Original assignee: Duerkopp Adler AG
Current assignee: Duerkopp Adler AG
Priority date: 1996-03-29
Filing date: 1997-03-20
Publication date: 2002-08-07
Anticipated expiration: 2017-03-20
Also published as: CZ46897A3; JPH1043456A; KR100412198B1; TW455638B; CN1164589A; CZ288992B6; KR970065813A; DE19612564C1

Abstract

A sewing machine has at least one needle rod (5) and a cloth presser rod (6) when necessary, which are mounted in a housing (1) and driven up and down. The rods (5,6) are sealed by means of a sealing component in relation to the housing (1). It is characterized in that the component is a valve stem seal (10, 10a) which is well-known.

Description

The Sewing machines that the sealing device of shank and/or presser bar is arranged

The present invention relates to a kind of Sewing machines, it has a shank and presser bar in case of necessity at least, and they are contained in the casing and can be driven does upper and lower motion, wherein, these bars by means of seal with respect to casing sealing.

Earlier disclosed DE19513406 has not introduced a kind of Sewing machines, wherein, shank by means of seal with respect to casing sealing.US4545312 discloses a kind of Tufting machine, wherein, these bars by lip ring with respect to casing sealing.

Also use the O RunddichtringO as seal, but can only be used for the Sewing machines of low cruise.For the Sewing machines in the present age, it is designed to per minute 6000 pins and more than 6000 pins, because the frictional force that is produced makes the O RunddichtringO be subjected to huge wearing and tearing, so that has only just lost its sealing function in a short time.For lubricated, when stopping, Sewing machines in casing, oozes in casing, for the oil on the member that rotates or vibrate, because machine oil flows out along these bars.In this case, not only machine oil loss is a kind of conclusive criterion, and main be to cause sewing that contaminated danger is arranged therewith relatively.

Therefore, along with the needle tracking number that improves novel sewing machine has to cancel seal.In order to seal,, wipe lubricant on bar off with it at sharp edge of the upper end of metal guide pin bushing design.DE-PS2229005 discloses a kind of Sewing machines, and it establishes the oil trap of an annular in the lower end of guide pin bushing, collects the machine oil that scrapes off from shank in the groove.By an oil exit pipe that links to each other with oil trap, machine oil can be sucked back in the casing.

Owing to act on the cross force that transmission mechanism is arranged on shank and the presser bar, make rod bending, consequently increased the gap that between guide pin bushing and bar, forms by sharp edge.Therefore oil film can not be wiped off fully, above the problem of pointed pollution sewing reappear.In addition, bar and support sleeve come in contact and cause wearing and tearing.

Therefore, the objective of the invention is to create a kind of sealing device that is used for this type of sewing machine needle bar and presser bar, it can reliable operation and realization at an easy rate.

The objective of the invention is to solve like this, promptly adopt a kind of Sewing machines, it has at least one shank, it is bearing in the casing and can be done upper and lower motion by transmission, wherein, bar by means of seal with respect to casing sealing, as seal, use be the valve stem seal device of knowing.

Sewing machines of the present invention also has a presser bar in case of necessity, it is bearing in the casing and can be done upper and lower motion by transmission, wherein, bar by means of seal with respect to casing sealing, it is characterized in that: as seal, use be the valve stem seal device of knowing.

The valve stem seal device is for example by DE-PS2943524 or (Leverkusen) known by company's specification " Drucksache Nr.892149-6/89 " of CR-Elastomere GmbH company.

The valve stem seal device only is used for internal combustion engine usually.The valve stem seal device is the sealing device of bar, and it is designed for high load capacity and high-temperature.It is made up of a ferrule as usual, and ferrule vulcanizes with a sealing lip of being made up of elastic part that comprises diaphragm and spiral tension spring ring.

As everyone knows, the knife-type oil stripping action of valve stem seal device, when dynamic duty,, perhaps or rather, reach by contact angle and the spring EFFECTIVE RANGE in medium one side between valve stem and the sealing lip mainly by acting on the radial load on the valve stem.Radial load forms by the distortion of sealing lip itself and elongation two parts of the spiral tension spring ring of being adorned.The principal character of valve stem seal device is that it allows the machine oil throughput different according to the Structure of Internal-Combustion Engine pattern.By corresponding structure design,, obtain necessary oil passageway by revising the sealing lip zone.In certain limit, this can control by the contact angle that changes positive spring EFFECTIVE RANGE and medium one side.

In order to prevent that air-stop gate or valve stem block, and are forced to need certain machine oil throughput in combustion engine cylinder head.The valve stem seal device should be designed in this case, and it helps machine oil and carries along a direction.The known machine oil that passes through in the valve stem seal device input cylinder head can not cause any harm in internal combustion engine, because machine oil has been burnt in the combustion chamber.

Be surprisingly found out that, the valve stem seal device of internal combustion engine will be designed for, as Sewing machines casing and the shank that can move up and down with may also have seal between the compressor arm time, what it was followed is other rule, the amounts of lubrication that is flow through is so little, thus when Sewing machines work or when parking all can ignore to this.At horn axle rotating speed is in the test run of 7000 rev/mins and 700 hours net operating times, and can confirm does not have machine oil to flow out at the shank place.Though there is not machine oil to flow out from shank, enough lubricating oil films are arranged, prevent that (about 6.76 meter per seconds of sliding speed) kill between support sleeve and the shank.

Because the valve stem seal device belongs to bulk article, thus cheap especially, and very big excursion can be arranged.Therefore, on guide pin bushing, can cancel for the necessary sharp edge of frizing so far.Because the cross force that crank driving mechanism produces and thereby the bending of thing followed bar, all can absorb by the strain of valve stem seal device.Because bar and support sleeve (sharp edge) may be without any contacting, thereby avoid the mechanical damage of bar.Consequently, shank can be compared considerably cheaper and light material (for example aluminium) manufacturing with a kind of with presser bar with used so far material, but because this material is compared easy wearing and tearing with high-intensity steel, so ban use of this material so far.By adopting light material also to greatly reduce free inertia force, so the noise during not only just with high rotating speed drops to minimum level, but also can reduce the driving power of motor, or under the situation that keeps power to equate, can correspondingly improve transferable moment of torsion.

As time goes on shank or presser bar and their guide pin bushing, produce the wearing and tearing of trace, can cause the machine oil throughput to increase (supported clearance increase).But owing to adopted the valve stem seal device, so the increase of the supported clearance that causes because of wearing and tearing does not influence the machine oil throughput.This just allows bigger mismachining tolerance, thereby has reduced manufacturing cost.

In addition, use the valve stem seal device, sealing station can be located in the casing of bearing position top.So, now no longer need to spend high structural expense, will flow through supporting and the machine oil that is dropped in danger on the sewing is arranged, fail go back to casing inside.

After pulling down shank or presser bar, can take off the valve stem seal device easily.If finally still in the valve stem seal device, produced too much wearing and tearing through running, then can fast and be changed at an easy rate, all be seldom so down time and thing followed output descend.

Structurally need only revise support sleeve, so also can not have and reequip or equipment again difficultly for the existing active machine that is in.

Describe a kind of embodiment of the present invention in detail by means of accompanying drawing below, in the accompanying drawing:

Fig. 1 is the part section by Sewing machines horn front portion;

Fig. 2 is for to see horn inside by Fig. 1 arrow II direction;

Fig. 3 is the Sewing machines schematic diagram;

Fig. 4 is the valve stem seal device partial enlarged drawing of support sleeve and top loading; And

Fig. 5 is for pressing the view of Fig. 4 arrow V direction.

Sewing machines mainly is made up of column 20, horn 21 and base plate 22.The horn axle 2 that along continuous straight runs extends is housed in the casing 1 of horn 21, and it is by there not being the further drive of motor of expression among the figure.At horn axle 2 front ends at least one shank 5 and presser bar 6 by crank driving mechanism 9 transmissions is set, makes the upper and lower motion of they

energy.Bar

5,6 passes support sleeve 3, the 3a that is fixed on casing 1 bottom, and stretches out from casing 1.By traditional mode, in the lower end of shank 5 pin 4 is housed, in presser bar 6 lower ends presser feet 7 is housed.

As the represented as an example bearing position of Fig. 4, support sleeve 3 stretches into the upper end in the casing 1, is shaped on ring-shaped step, and a commercial general valve stem seal device 10 is installed on the step, and sealing lip 8 is abutting on the shank 5 above the support sleeve 3.Produce by spiral tension spring ring 11 in order to seal required radial load.Support sleeve 3 and valve stem seal device 10 correlation structurally, consistent with the correlation of support sleeve 3a that is used for presser feet 6 and valve stem seal device 10a.The frizing effect of contact angle α between

bar

5,6 and the sealing lip 8 valve

stem seal device

10,10a during in addition for dynamic duty has decisive influence.In order to be used for Sewing machines, valve

stem seal device

10,10a will select from the production schedule according to sealing surface diameter and fixed diameter.

Claims

1. Sewing machines, it has at least one shank (5), and it is bearing in the casing (1) and can be done upper and lower motion by transmission, wherein, bar (5), is characterized in that with respect to casing (1) sealing by means of seal: as seal, use be the valve stem seal device of knowing (10).

2. Sewing machines, it has at least one presser bar (6), and it is bearing in the casing (1) and can be done upper and lower motion by transmission, wherein, bar (6), is characterized in that with respect to casing (1) sealing by means of seal: as seal, use be the valve stem seal device of knowing (10a).