US3910210A

US3910210A - Universal support for the needle cooling group of a sewing machine

Info

Publication number: US3910210A
Application number: US452721A
Authority: US
Inventors: Nerino Marforio
Original assignee: Virginio Rimoldi and Co SpA
Current assignee: Virginio Rimoldi and Co SpA
Priority date: 1973-04-12
Filing date: 1974-03-20
Publication date: 1975-10-07
Anticipated expiration: 1992-10-07
Also published as: GB1428916A; IT983801B; DE2415990A1; JPS5041651A; DE2415990C3; JPS5520718B2; ES425266A1; DE2415990B2

Abstract

A universal support for one or more nozzles of a needle cooling device applicable to all types of single or multi-needle sewing machines. The universal support includes a cooling air distributor to which one or more air cooling nozzles can be connected and which can be independently adjusted in a generally vertical direction as well as the direction at which they direct the cooling air emitted therefrom.

Description

United States Patent 1 1 1111 3,910,210 Marforio Oct. 7, 1975 [54] UNIVERSAL SUPPORT FOR THE NEEDLE 2,690,148 9/1954 Adams 112/218 R COOLING GROUP OF A SEWING MACHINE [75] Inventor: Nerino Mari'orio, Milan, Italy [73] Assignee: Virginio Rimoldi & C. S.p.A., Milan,

Italy [22] Filed: Mar. 20, 1974 [21] Appl. No.: 452,721

[30] Foreign Application Priority Data Apr. 12, 1973 Italy 22905/73 [52] US. Cl 112/218 R [51] Int. Cl. D05B 71/04 [58] Field of Search 112/218 R, DIG. 2, DIG. 3,

[56] References Cited UNITED STATES PATENTS 2,669,207 2/1954 Happe 112/218 R FOREIGN PATENTS OR APPLICATIONS 1,259,231 3/1961 France 112/218 R Primary Examiner- H. Hampton Hunter [57] ABSTRACT A universal support for one or more nozzles of a needle cooling device applicable to all types of single or multi-needle sewing machines. The universal support includes a cooling air distributor to which one or more air cooling nozzles can be connected and which can be independently adjusted in a generally vertical direction as well as the direction at which they direct the cooling air emitted therefrom.

4 Claims, 5 Drawing Figures 7 Sheet 1 of 3 Oct. 7,1975

US. Patent U.S. Patent Oct. 7,1975 Sheet 2 of3 3,910,210

UNIVERSAL SUPPORT FOR THE NEEDLE COOLING GROUP OF A SEWING MACHINE BACKGROUND OF THE INVENTION The present invention relates to the needle cooling device of a sewing machine to prevent excessive heating of the needle caused by friction between the needles and the cloth and/or between the moving thread and the needle eye through which it is drawn.

More particular, the present invention relates to a universal support for the cooling nozzles, which can be applied to any type of single or multi-needle sewing machine, in which the needles are disposed in either aligned or stepped relation.

The excessive heating of the needles, especially when sewing synthetic fabrics may cause either the melting of the fabric or the breaking of the thread passing through the needle eye and will reduce considerably the mechanical resistance of the needles.

In certain cases it is therefore necessary to assure proper cooling of the needles and different systems have been designed for this purpose, for example directing air cooling jets toward the needles from a predetermined direction to dissipate excess heat.

In known needle cooling systems, one or at the most two nozzles are carried by a clamp formed by two contiguously disposed plate elements having on the mating surfaces thereof two aligned half-round recesses for supporting two nozzles. The plates are connected together by means of a screw and a resilient washer with a threaded hole allowing the frictional rotation of the nozzles with respect to the remaining part of the support that is fixed to the sewing machine head.

Supports of this type have the following drawbacks:

They allow the application of only two cooling nozzles and which limits the effectiveness thereof to sewing machines having only one or two needles;

The distance between the two nozzles is fixed and the two nozzles can be swivelled only simultaneously and not one independent of the other one; for this reason the supports serve only for sewing machines having the same needle distance; 7

Each nozzle requires a separate air feed line resulting in an excessive amount of space being taken up in the area of the needles by the separate lines and connections to each cooling nozzle;

It is very difficult to remove the nozzle support for the threading-in of the needles without having to readjust the nozzles upon re-assembly of the support to its intended location.

It is the main object of the present invention to eliminate the above-mentioned drawbacks by providing a support which can be fitted to any type of sewing machine regardless of the number, arrangement and inclination of the needles.

It is a further object of the present invention to provide each needle with a cooling nozzle which can be independently adjusted to direct its air from different angles and heights relative to its respective needle.

A still further object is to provide a means whereby all the nozzles can be moved from their active position simultaneously during threading in of the needles and returned to their active position without having to readjust them in that position.

SUMMARY OF THE INVENTION the present invention includes a multi-way distributor which is adapted to permit simplified connection of one or more nozzles with the capability of positioning them independently one from the other, to adjust the distance between the nozzles and the needles as well as the distance of each nozzle from the needle plate.

This universal cooling device support includes a first angular element provided with means for fixing the cooling device to the sewing machine and for regulating its height. A second angular element rotatably assembles to the first element and is provided with an arm pointing in a direction perpendicular to the line of feed of the fabric to be sewn. A distributor unit is fixed to this arm and is provided with one or more pipes complete with cooling nozzles. The second angular element is provided with means which permits the distributor to be pivoted to and from its operative position and the distributor unit is connected by means of a flexible feed line to a suitable source of compressed air.

Further details and advantages of the present invention will become more fully apparent by reference to the appended claims and as the following detailed description proceeds in reference to the figures of drawing wherein:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of the support according to the present invention applied to a conventional sewing machine;

FIG. 2 is a side view of the support applied to the sewing machine of FIG. 1;

FIG. 3 is an enlarged front view of the support in FIG.

FIG. 4 is a section taken along line IV-IV in FIG. 3;

FIG. 5 is asectional view taken along line VV in FIG. 4.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to FIGS. 1 and 2, the device according to the present invention is shown applied to a sewing machine, comprising in general a head 1 formed at the free end of an arm 2 connected with a column 3 toa working surface 4 formed on top of the base 5. This head is provided with the usual presser bar 6, at the lower end of which there is a presserfoot 7. Forward of the presser bar 6 there are the known upper sewing components, which include a pair of needles 8. The cooling device 9 includes a first angular element 10 fixed to the head 1 by means of a screw 11 passing through a slot-like hole 12. A second angular element 13 is fixed to the lower part of the first angular element 10 (FIG. 4) with a screw 14 and a nut 15. A friction ring 16 is inserted between the screw 14 and the second angular element 13, whereby said friction ring 16 permits controlled rotation of said second angular element around a vertical axis 17. The second angular element 13 has an integral arm 18 extending perpendicular to the line of feed of the fabric to be sewn, as indicated in FIG. 2 by the arrow A. Arm 18 is provided with two slots 19 (FIGS. 1 and 3) through which screws 20 extend for assembling the body of a compressed air distributor 21 thereto. This distributor 21 includes a first body portion 22 having a manifold channel 23 (FIGS. 4 and 5), from which four parallel and uniformly spaced discharge channels 24 extend and of a second body portion 25 having an L-shaped cross-section having four channels 26 which are coaxial to the discharge channels 24. The manifold 23 is connected through a coupling 27 and pipe 28 with a conventional compressed air source complete with the standard control shown in FIG. 5 the two outer discharge channels 24 are provided with downwardly directed pipes 31 the lower ends of which define nozzles 32 directed toward the zone of theneedles; and each of the two center discharge channels have a plug pin 33 assembled therein. The pipes 31 are slidably assembled in the channels 24 and are rotatable about their own axis for the selective positioning of the nozzles 32 with respect to the needles of the sewing machine. The sealing rings 30 provide the required seal for the compressed air and permit the above-mentioned selective positioning of the pipes 31 without loss of air. The advantages of the abovedescribed support are made possible by the ability to vary or control the positions of the support and of the nozzle as follows:

1. by vertical displacement of the complete cooling unit 9 by raising or lowering the first angular element 10' mounted on the head 1 of the sewing machine within the limits of slot 12 in said first angular element;

2. by rotation of the second angular element 13 around its vertical axis 17 so as to rotate the distributor 21 with its nozzles away from the operating position and facilitate the threading up of the needles or any other operation required. The return of the distributor 21 to its operating position is controlled by a stop pin 34 which assures-the precise positioning of said distributor in the operating position (FIGS. 3 and 4);

3. by lateral displacement of the distributor 21 within the limits of slots 19 on the arm 18 for regulating the distance of said distributor respectively to the vertical rotational axis of the said second angular element and to the vertical axis of the needles; I

4. by the independent rotation of the pipes 31 around their own axes for positioning the nozzles 32;

by the longitudinal displacement of the pipes 31 along the discharge channels 24 of the distributor 21 for adjusting the height of the nozzles with respect to the needle plate with the air jet so as to direct the air from 'said nozzles at a desired area of the needle and is' particularly advantageous for machines having the needles at aheight differing from that of the needle plate.

The description of this preferred embodiment of the support according to the present invention refers to a two-needle sewing machine and it should be understood that the support can also be used for three and four-needlesewing machines by simply removing the plug pin 33 and substituting them with a pipe 31. It is possible to use two pipes with nozzles for the two center channels, or one center and one outer channel according to the distance between the needles and whatever distance it is desired to have between needle and nozzle. When having stepped needle condition, one or more nozzles may be directed toward the needle most remote from the distributor to increase the efficiency of the needle cooling.

lclaim: i

1. Auniversalsuppoit for the cooling unit of a multineedle sewing machine comprising:

a. a first angular element adjustably attached to the sewing machine;

b. a secondangular element rotatably connected to said first angular element;

c. an air distributor carried on said second angular element and having a single source of air supply;

d. a plurality of air discharge channels in said distributor;

e. a plurality of pipes individually rotatable and longitudinally adjustable carried in and extendingfrom said discharge channels having nozzles forming the outer ends thereof and movable with said distributor on said second angular element to and from a position for directing the air emitted therefrom to the needles of the sewing machine.

2. The universal support according to claim 1 wherein said air distributor includes a, sealing ring operatively associated with each of said air discharge channels through which saidpipes extend.

3. The universal support according to claim 1 wherein said second angular element. being rotatably connected to said first angular element includes a friction ring intermediate said elements for effecting selective manual rotatable movement of said second angular element.

4. The universal support according to claim 1 wherein said air distributor includes means defining plug pins for selective assembly in those discharge channels from which air is not required.

l l l

Claims

1. A universal support for the cooling unit of a multi-needle sewing machine comprising: a. a first angular element adjustably attached to the sewing machine; b. a second angular element rotatably connected to said first angular element; c. an air distributor carried on said second angular element and having a single source of air supply; d. a plurality of air discharge channels in said distributor; e. a plurality of pipes individually rotatable and longitudinally adjustable carried in and extending from said discharge channels having nozzles forming the outer ends thereof and movable with said distributor on said second angular element to and from a position for directing the air emitted therefrom to the needles of the sewing machine.

2. The universal support according to claim 1 wherein said air distributor includes a sealing ring operatively associated with each of said air discharge channels through which said pipes extend.

3. The universal support according to claim 1 wherein said second angular element being rotatably connected to said first angular element includes a friction ring intermediate said elements for effecting selective manual rotatable movement of said second angular element.