US1197400A - Pantographic attachment for sewing-machines - Google Patents

Description

H. RICHTER.

PANTOGRAPHIC ATTACHMENT FOR SEWING MACHINES. APPLICATION FILED FEH.29.1916.

1 1 97,400. Patented Sept. 5, 1915.

wuo/wtoz UNITED STATES PATENT OFFICE.

HERMANN RICHTER, OF DENVER, COLORADO.

PANTOGRAPI-IIC ATTACHMENT FOR SEWING-MACHINES.

LISWACOO.

Application filed February 29, 1916.

To all whom it may concern:

Be it known that LHERMANN RICHTER, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Pantographic Attachments for Sewing-Machines; and I do declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in means for manipulating a series of work holders respectively connected with a corresponding number of sewing machines.

This attachment consists of a combination of pantographic instruments so connected with the work holders that by the movement of the pointer or stylus over the model suitably mounted, figures or designs corresponding with the pattern will be formed upon the cloth or other fabric carried by the work holders of all of the sewing machines, any desired number being employed. In this manner the manipulation of a single pointer or stylus, results in simultaneously producing any desired number of designs corresponding with the pattern, since the number of sewing machines connected in cooperative relation with the pantographic instruments, may be indefinite and limited only by the power which it is practicable to exert through the medium of the pantographic construction. It will be understood that the manipulation of each work holder through the medium of the combination of pantographs, requires a certain amount of manual exertion. Consequently, there is a limit to the number of work holders that may be practicably manipulated from a single pointer or stylus.

My object is to provide a pantographic construction'which shall offer a minimum resistance, thus making it practicable to simultaneously actuate a maximum number of work holders mounted in cooperative relation with a corresponding number of sewing machines. The general idea of manipulating a series of work holders connected with a corresponding number of sewing machines through the medium ofa combination of pantographic instruments, actuated Specification of Letters Patent.

Patented Sept. 5, 1916.

Serial No. 81,284.

from a single pointer or stylus as the latter is moved over the pattern or design which it is desired to reproduce, is not new. Hence, my object is to provide a novel specific construction which shall have advantages over other constructions heretofore in vogue, which have been intended to accomplish the same results.

The features of novelty of my improvements, result in reducing. the number of pivot points, and, consequently, reducing the friction or resistance offered as the pantographic instrument is manipulated for the purpose stated.

In my improved construction of pantographic instrument, I employ two pantographic units which are suitably spaced and both of which are connected with the series of work holders in cooperative relation, each pantographic unit consisting of a single parallelogram only. Furthermore, in order to reduce the friction to a minimum, I employ antifrictional wheeled supports for the rods or links which connect the two pantographo units. The reduction of the friction in a construction'of this kind to a minimum, is very important, since, if the friction or resistance offered by the pantographic construction is too'great, accuracy in the performance of the work is impossible. For instance, if considerable friction must be overcome when the tracing stylus is moved, the pressure or force necessary to start the movement will be so great, that when once started the momentum of the structure will carry the tracing stylus farther than is required or desired, thus preventing accuracy, or, in other words, spoiling the work.

Having brieflybutlined my present improvement, I will proceed to describe the same in detail, reference being made to the accompanying drawing, in which is illustrated an embodiment thereof.

In this drawing,-Figure l is a top plan View of my improved pantographic construction, connected in cooperative relation with work holders which are themselves cooperatively arranged with a corresponding number of sewing machines, six being illustrated in the drawing. Fig. 2 is a section taken through one of the wheeled anti-frictional supports for the links or rods which connect the two pantographic units.

The same reference characters indicate the same parts in both views. 7

Let the numeral 5 designate each of two pantographic units each. of which is composed of a parallelogram consisting of two parallel members 6 and 7 and two other parallel members 8 and 9. The member 6 is pivotally connected with the two members 8 and 9 as shown at 10 and 12; while the member 5 is pivotally connected with the two members 8 and 9 as shown at 13 and 14. The two members 8 and 9 are each provided with a number of perforations 15 for purposes of adjustment, since adjustment of the anto-graphic units is necessary in order to determine the scale of the work as compared with that of the pattern. One advantage of a construction of this character is, that the pattern may be comparatively large, while the design produced onthe work carried by each holder, may be as small as is necessary or desirable.

Themember 60f each pantographic unitis provided with an extension 16beyond' the pivot 10, the extremity of said extension being pivotally connected as shown at 17 with a stationary part 18. The pivots 17 are the only stationary parts of the entire pantographic structure. Each of the members 9 is provided with a rigid part 19 which ex tends from the pivot 12, at right angles'to the part 9 whereby the parts 9' and 19 form substantially a bell' crank lever. The extremities of the parts 19 remote from the pivots 12, are pivotally connected as shown at 20 with the opposite extremities of a flat rod or link 21 whichis-supported intermediate its extremities by two anti-frictional supports 22 each of which consists of-avertically disposed threaded stem 23 which passes through an opening 24 formed inthe rod 21 and connected with the latter by means of nuts 25 and 26respectively screwed against the rod on opposite sides. The lower extremity of the stem 23 is" formed integral with a plate 26, while a similar plate 27 is threaded upon the stem 23 and held in the desired position of adjustment by a lock nut 28 The two parts 26 and 27 are arranged on opposite sides of a" small platform 29 from which the said plates are spaced by bearing balls 30. The platform 29 is equipped with downwardly projecting lugs or ears 31 which are connected with the spindle 32 of a wheel or roller 33. By virtue of this construction the roller-carrying platform 29, will change its position to correspond with the direction of travel, as circumstances may require and with a minimum of friction which is'very important-in an instrument of this character, as heretofore described.

The member 9 of one of the pantographic units 5, being the one farther to the right in Fig. 1 of the drawing, is provided with an extension 34 which carries a stylus 35 which extends downwardly whereby it is adapted to be moved over the pattern or design 36 to be reproduced, this pattern being formed upon a piece of material 37 which is fastened by means of thumb tacks 38 or any other suitable fastening devices, upon the table or other suitable support 39 upon which the pantographic construction and the sewing machine heads 40 are mounted.

The two members 6 of the pantographic units, are pivotally connected asshown at 41- intermediate their extremities with the oppositeends of a rod 42 which is supported intermediate its extremities with wheeled supports'22.- The pivots 13 of the two pantographic units, connect these units respectively with the extremities of arod 43, the latter'being mounted on a wheeled support 22 located intermediate its extremities. Thisrod 43 is also connected in operative relation as shown at 44 with the work holders 45 of all of the sewing machines 40, six

operate in unison through themedium of gear wheels 46 which are mounted respectively on the shafts or spindles 47 of the several machines and connected by means of a chain 48' with a suitable motor (not shown).

The-work upon which the design or pattern 36 ist'o b'e-reproduced, is designated in each case'by the numeral49 and the same is connected in each case with a work holder 45 which is'' The needles of the several sewing machines and which are to reproduce the design or patternin the form of embroidery, are arran-ge'd to pass through the portions 50 of the work inclosed by the'rings 51 of the several workholders 45.

Assuming that the pantographic construction is mounted on the table 39 and cone nected with the work holders-of the sewing machines in the manner heretofore described, the operator in order to reproduce the design 36, grasps a knob 52-with which the free extremity of the stylus-carrying ex tension- 34 is equipped, and moves this extension in the manner required in order to trace the design 36 which is to be reproduced by the sewing machines on the work 49, as heretofore explained. By virtue of the well-known principle of the operation of pantographs,-the design 36 will be reproduced on a suitably reduced" scale, on the several pieces of work 49.- Hence, the principle of operation need not be explainedin detail as it is'well understood, the novel feature of my improvement being the specific pantographic construction disclosed, whereby the friction or resistance incident to its operation is reduced to a minimum.

Having thus described my invention, what I claim is,-

1. A pantographic attachment for sewing of ordinary construction.

machines consisting in combination with work holders adapted to be respectively associated with the machines, two parallelograms, one member of each parallelogram having a rigid extension forming an angle with the said member, a link connecting the said extensions, a second link connecting two of the corresponding members of the two parallelograms, and a third link connecting the two parallelograms with the several work holders.

2. A pantographic attachment for sewing machines consisting in combination with work holders adapted to be respectively associated with the machines, two parallelorams, one member of each parallelogram aving a rigid extension forming an angle with the said member, a link connecting the said extensions, a second link connecting two of the corresponding members of the two parallelograms, a third link connecting the two parallelograms with the several work holders, and anti-frictional supports for the said links.

In testimony whereof I alfix my signature, in presence of two witnesses.

HERMANN RICHTER. Witnesses A. EBERT OBRmN, A. J. OBRIEN.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Iatents, Washington, D. 0."

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