US1084736A

US1084736A - Thread-controlling means for sewing-machines.

Info

Publication number: US1084736A
Application number: US77865313A
Authority: US
Inventors: Christian H T Hagelstein
Original assignee: Reece Button Hole Machine Co
Current assignee: Reece Button Hole Machine Co
Priority date: 1913-07-12
Filing date: 1913-07-12
Publication date: 1914-01-20
Anticipated expiration: 1931-01-20

Description

G. H. T. HAGELSTBIN.

THREAD CONTROLLING MEANS FOR SEWING MACHINES.

APPLIOATION FILED JULY 12, 1913.

Patented Jan. 20, 1914.

"Jada/14am l8 l2 I9 20 Witnesses. Inventor.

Christian HT Hagelstein,

b WWIzW Atty's.

cnLuMBlA PLANOGRM'II KID-,WASIHNGTON. :1. c4

UNITED STATES PATENT OFFICE.

CHRISTIAN H. '1. HAG-ELSTEIN, OF DORCHESTER, MASSACHUSETTS, ASSIGNOR TO REECE BUTTONHOLE MACHINE COMPANY, 015 BOSTON, MASSACHUSETTS, A COR- PORATION OF MAINE,

THREAD-CONTROLLING MEANS FOR SEWING-MACHINES.

To all whom it may concern:

Be it known that I, CHRISTIAN H. T. HAeELs'rnIN, a citizen of the United States, residing at Dorchester, county of Suffolk, State of lvlassachusetts, have invented an Improvement in Thread-Controlling Means for Sewing-Machines, of which the following description, in connection with the accompanying drawing, is a speclficatlon, l ke characters on the drawing representing like parts.

This invention relates to threadcontrolling means for sewing machines of that gen eral type which is illustrated in United States Patent No. 937 ,7 05, dated October 19, 1909, and granted on application of John Maitland, and has for its principal obyect to provide an improved thread-controlling means of this type which is specially designed to meet the requirements of high speed operation. The device shown in said Patent No. 937,705 was designed for use in connection with so-called lmttonhole finishing machines, such for instance, as is shown in United States Patent to Reece No. 404,863, dated July 11, 1889 and United States Patent No. 1,009,408 dated November 21, 1911 and granted on an application of mine.

The thread-controlling means illustrated in said Patent No. 937,705 comprises a tension device and a spring-actuated auxiliary take-up lever or check, as it is termed in the trade, which acts on the thread between the tension device and the re ular take-up lever of the machine, said check or auxiliary take-up lever cooperating with the regular takeup lever to take up any slack in the thread and to maintain a proper tension at all times on the thread. In said Patent No. 987,705 also the tension device and the auxiliary take-up or check are mounted on a base plate which is detachably secured to the sewing machine base.

There is a constantly growing demand in the trade for sewing machines which will operate an increased speed and it has been found that while the device shown in the Patent No. 937,705 operates satisfactorily when the sewing machine is run at a moderate speed, yet when the speed of the sewing machine is increased beyond a certain point the check device does not follow the movements of the take-up lever with that Specification of Letters Patent.

Application filed July 12, 1913.

Patented Jan. 20, 1 914. Serial No. 778,653.

delicacy and perfection that necessary for perfect sewing, this being due to the manner in which the check of said patent is constructed and t0 the inertia of the moving parts.

It is in order to satisfy the requirements of a high speed sewing machine that I have made my present invention by which I have improved the thread-controlling means of said Patent No. 937 ,705 in such a way that it will operate as satisfactorily when the sewing machine is run at an extremely high speed as it does when the machine is run at a more moderate speed. Furthermore, in making these improvements I have provided a simplified way of adjusting the parts so as to provide different tensions for the check to meet different requirements of use and I have also made other improvements in the device all as will be more fully hereinafter described and then pointed out in the appended claims.

Referring now to the drawings wherein I have illustrated a selected embodiment of my invention for the purpose of disclosing the principle thereof Figure 1 is a rear side view of the base of a buttonholc finishing machine showing my improved thread-controlling means thereon. Fig. 2 is an enlarged View of the thread-controlling means removed from the plate. Fig. 3 is a section on the line w-w, Fig. 2. Fig. l is a section on the line y-y, Fig. 2.

Since my invention relates to the threadcontrolling means only, I have not deemed it necessary to illustrate to any extent the sowing machine itself but I have shown a sewing machine base A which is horizontally slotted at a in. which slot the usual vibrating take-up lever B operates, all as shown in said Patents Nos. 404,803 and 937,705.

In the illustrated embodiment of my invention I have shown the thread-controlling means as mounted on a base plate C as shown in said Patent No. 937,705, although it is not essential to the invention that the threadcontrolling means should be thus mounted.

My improved thread-controlling means comprises a tension device and an auxiliary take-up or check, both of which are designed to meet the requirements of high speed operation. The tension device is herein shown as comprising the usual friction disks 1, 2 between which the thread if is adapted to extend, the disk 2 being acted upon by a spring 3 which applies the frictional pressure to the thread as usual in tension devices of this sort. As herein shown, these friction disks are mounted on a stud 4: which is secured to the base plate C and this stud has screw-threaded thereto the nut 5 by which the tension of the spring 3 can be adjusted. There is nothing novel in this particulartype of tension device per se.

The check or auxiliary take-up which I employ to meet "the requirements of high speed operation is in the form of a spring wire arm 6 which is formed at its end with the guide eye 7 through which the thread 25 passes. This spring wire check is sustained by a stud 8 secured to the base plate C, said wire being wound around the stud a plurality of times, and the end 9 of the wire having its extremity 10 bent laterally and adapted to enter in one of a plurality of holes 11, formed in the baseplate O. The spring wire check is so constructed that it tends normally to move toward the tension device or to the right in Fig. 2 but it will yield to the left, Fig. 2 under the influence of the thread If and will thus cooperate with the take-up lever B in taking up the slack of the thread and maintaining a proper tension thereon. The tension which this check 6 gives to the thread can be adjusted by simply adjusting the arm or end 9 of the spring, for it will be seen that by shifting the said end downwardly Fig. 2, the amount of force or tension which the take-up will apply to the thread will be increased, while by shifting the end 9 upwardly this tension or force will be decreased. The resiliency of the wire permits the operator to readily withdraw the end 10 from any aperture 11 and then to swing the end 9 up or down to place the required tension on the take-up, after which the end 10 can be reentered into one of the apertures 11, thereby to hold the take-up in its adjusted posit-ion.

Cooperating with the take-up or check 6 is an adjustable stop which limits the throw thereof, and in my present invention I have provided a stop of such construction that it can be adjusted while the machine is in operation and without the necessity of using a screw-driver or other implement for this purpose. Furthermore, in my present invention the stop can be adjusted without varying the tension on the check 6 and the tension on the check can also be adjusted without changing the posit-ion of the stop, and in both of these respects my invention is different from and an improvement over the device shown in Patent No. 937,705.

In the present embodiment the adjustable stop is in the form of an arm 12 which is shown as pivotally mounted on the stud 4t which carries the tension device and said arm 12 has associated therewith a handle 13 by which it can be adjusted, said handle being shown as provided with a locking pin 14; adapted to enter in one of a plurality of recesses 15 formed in the base plate C. The stop arm 12 is situated in the rear of the check 6 and between the guide eye 7 and the point of connection between the check and the base plate, and it will be readily seen that by adjusting the arm 13 up or down the stop arm 12 will be moved toward or from the check device 6. Said stop arm acts as a means to limit the extent of the backward throw of the check and in using the sewing machine it is necessary to adjust this for difi erent grades of material.

The stud a is herein shown as provided with a bearing portion 16 on which the arm 12 is sustained and said stud has also fast thereon a collar or flange 17 which is interposed between the stop arm and the tension device and which serves to hold the stop arm in proper position on the stud.

18 is a guide member which is secured to the base plate C by meansof the screw 19 and pin 20 and between which and the base plate the check 6 and stop arm 12 are situated, said guide member operating to hold the stop arm and check in proper position relative to each other. The front end of the guide member is bent laterally as shown at 21, thereby furnishing a stop to limit the forward movement 0f the check.

It will be seen that I have reduced materiall the number of parts in this threadcontro ling means and have also simplified the construction. Furthermore, the device as constructed will operate satisfactorily at the highest speed at which it is possible to run the sewing machine. In addition, the tension of the check can be adjusted independently from its length of stroke and vice versa, and these adjustments can be effected without the use of any implements and while the machine is in operation. All of these features are of decided advantage in the operation of a sewing machine of this type.

While I have herein illustrated the parts of the thread-controlling means as mounted on a base plate 0 which is detachably secured to the sewing machine base A, yet this particular way of mounting these parts is not essential to the invention. Furthermore, various constructional changes may be made in the parts without departing from the invention, as outlined in the appended claims.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. Thread controlling means for a sewing machine comprising a base plate having a plurality of recesses, a stud secured to said base plate, a tension device on said stud, a spring wire check supported by said base plate, an L-shaped stop member pivoted on said stud between the tension device and base plate, one arm of said stop member constituting a stop for the check and the other arm constituting a handle by which the stop can be adjusted, and a locking pin on said latter arm adapted to enter one of said recesses and thus hold the stop member in adjusted position.

2. Thread-controlling means for sewing machines comprising a base plate having a series of recesses, a tension device on said base plate, a stud secured to said plate, a check formed of spring wire which has a guide eye at one end and is coiled about said stud, the other end of said Wire having a laterally extending portion adapted to engage in any one of said recesses, a stop for the check and means for adjusting the position of said stop.

3. Thread-controlling means for sewing machines comprising a base plate having a series of recesses, a tension device on said base plate, a stud secured to said plate, a check formed of spring wire which has a guide eye at one end and is coiled about said stud, the other end of said wire having a laterally extending portion adapted to engage in any one of said recesses, a stop for the check pivotally mounted on the base plate and means to turn the stop about its pivot thereby to control the length of movement of the check.

4. Thread controlling means for sewing machines comprising a base plate, a tension device thereon, a spring wire check having a guide eye for the thread, a stop arm pivotally mounted on the base plate, and pro vided with means by which it may be turned about its pivot thereby to adjust its position, and a guidin member separate from the stop arm and fixedy secured to the base plate, said guiding member overlying both the check and the stop arm.

5. Thread controlling means for sewing machines comprising a base plate, a tension device thereon, a spring wire check having a guide eye for the thread, a stop arm pivotally mounted on the base plate, and provided with means by which it may be turned about its pivot thereby to adjust its position, and a guiding member separate from the stop arm and-fixed1y secured to the base plate, said guiding member overlying both the check and the stop arm and havlng a laterally extending portion to form a stop to limit the forward movement of the check.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

CHRISTIAN I1. '1. HAGELS'IEIN.

Witnesses:

J. WARREN NICHOLS, WM. C. Bouvnnr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.