US1126881A - Parallel-motion device for embroidering-machines. - Google Patents

Description

M. SOHOENFELD.

PARALLEL MOTION DEVICE FOR EMBROIDERING MACHINES.

APPLICATION FILED APRLIZ, 1912.

Patented Feb. 2, 1915.

' it may be said that the operating 40 tambour frame is not of a very heavy con- MORRIS SCHOENFELD, OF 1303301318011, SWITZERLAND.

PARALLEL-MOTION DEVICE FOR EMBROIDEBING-MAQEINES.

Specification of Letters IPatent.

Patented Feb. 2, 19150 Application filed April 1a, 1912. Serial no. 690,243.

To all whom it 121 ag concern Be it known that 1, Morris SCHOENFELD, a citizen of the United States, and a resident of Rorschach, in the Canton of St. (aall, Switzerland, have invented certain new and useful Improvements in Parallel- Motion Devices for Embroidering-Machines, of which the following is a specifica tion.

My invention relates to an improved device for controlling the movements of the tambour in embroidering machines of the very large type. In the large type of embroidering machine the tambour frame usually consists of a rectangular steel frame and in the late forms of machine such tambour frames have attained a length of thirty feet and a height of five or six feet; and as this frame has to be moved at each operation of the machine in order to produce the desired design upon the fabric supported by the tambour frame, the latter must be made as light as possible. In makthe tambour frame light enough and long enough for practical purposes it becomes subject to distortion and vibration when being rapidly moved from one position to another for the different stitch positions and the vibration and distortion interferes with the production of accurate work. The tambour frame is supported in a vertical plane and is generally moved from one p0- sition to another in its vertical plane ofmovement either by a pantograph or j acquard and the force for moving the tambour frame is usually applied at one end of the latter and usually atone corner thereof; so force is applied at one point of the tambour frame rather than throughout its length. If the struction the application of. the operating force to one portion only of the frame causes slight distortion of the frame during the rapid movements thereof and this affects the quality of the work. It is necessary for the tambour frame to move in parallelism throughout its length and any distortion even to the extent of a fraction of an inch causes serious defects in the work.

The object of my present invention is to provide a parallel motion device for causing the tambour frame to move in proper parablelism when the operating force for moving the frame is applied to one point thereof; and while the same may be used for vertical stitch are sectors 11 an various stitching mechanisms have been omitted, Fig. 2, is an enlarged detail, showing parts of the device in elevation, Fig. 3, is a sectional view showing the parts contained in Fig. 2, in plan, Fig. 4, is a plan view of operating straps, and Fig. 5, is a sectional view taken on the line 55 of Fig. 1.

In the drawings, I have shown end standards 1 and 2, forming part of the stationary frame of an ordinary embroidering machine. The tambour frame 7, is shown as a rectangular frame consisting of upper and lower horizontal bars 6 and 5, connected at their ends by vertical bars 3 and 4, to form a rigid, movable frame. This tambour frame is provided with extended brackets 22 shown as projecting outwardly and oppositely from the upper corners of the frame, and these brackets rest upon the sectors 21, which are part of a rocking member comprising the arms 19 and a hub fulcrumed upon the pin 20. The latter are arranged upon one end of the arms 17 forming part o f'a rocking member, consisting of a hub '18 and radial spokes 10. These rocking members are arranged to rock upon the shafts 9, supported upon the brackets 8, on each'of the end standards 1 and 2, of the stationary-frame. On the spokes 10 there 13 and 15. The strap 13, is connected at its opposite ends to the sectors 11 by the screws 14; so that the strap has a rolling contact with the sectors. The strap 15, is' 'connected with the sectors 12, by means of the screws 16 and en ages in a similar manner over sectors 12. Fixtending outwardly from one of the rocking members I have provided an arm 23, connected with or forming part of one of the rocking members; and the outer end of which is provided with a link 24 supporting a movable weight 25. This mechanism constitutes an ordinary 12 opposite each other, over which engageflexible straps or bands counterbalancing and parallel motion device used upon embroidering machines. hen the tamhour frame is moved up or down the weight 25, moves accordingly, and the rocking of the arms 17, causes the sectors 21., to remain in continual contact with the brackets 22, so that the weight of the turnbour frame 'will be counterbalanced in its dilferent positions by means of the movable weight By reason of the connection of the rocking members. through the straps 13 and 1.5, both rocking members must move in unison and thereby the tambour frame is caused to mo e in vertical parallelism.

\Vhen the tambour frame is moved longi tudinally however, the sectors 21, rock upon their shafts 20 so that the longitudinal movements of the tambour frame effects no other change in the parallel motion device just described. This parallel motion device only controls the vertical movement of the tambour frame while my improved mcchanism is adapted'to control its horizontal movement, which is of equal, if not of greater importance, since the tambour frame is much longer than it is high. The preferred form of my invention for controlling the horizontal movement of the frame consists of the following.

.Upon the standards 1 and .2, of the stationary frame I have provided brackets 28, which form journal sockets for the upright shafts 29 and 29, arranged at each end of the machine; and these shafts are preferably movable vertically in the brackets 28. Extending upwardly from the stationary standards. I have provided supporting members 26 which have brackets 2? corresponding to the brackets 28 and they also form journal sockets for t'he'shafts 29, and '29 respectively. At different points of the height of the tambour frame and at each end thereof I provide means for operating and adapted to be operated by the shafts 29 and 29 so that any movement applied to one end or any portion of the tambour frame, will be accurately transmitted to the other end thereof. For this purpose I have provided near the lower corners of the tambour frame brackets having parallel plates 31, between which pinions 30 on the shafts 29 and 29, engage. The pinions 30 are fast upon the shafts 29 and 29 and they mesh with racks 32 horizontally disposed and forming part of the brackets 31. To the upper corners of the tambour frame and preferably arranged upon extended brackets 35,-1 have provided brackets 31 in all respects similar to those at the lower corners of the frame and racks 32 on these brackets mesh with pinions 30 also arranged between the bars 31. Preferably at their upper ends the shafts 29 and 29 are provided with fixed pulleys 36 over the peripheries of which engages a metallic band or strap 38 having its ends secured to the pulleys 36, by

means of the screws 40. The other metal strap or band 37 engages around the peripheries of the pulleys 36, in a reverse direction, and its ends are also secured to the pulleys by means of screws 39.

The operating force for moving the tambour frame may be applied thereto by any \vell known means and in order to illustrate the operation of my device I have shown the tambour frame connected with a mechanism such as that shown in United States patent to Joseph A. Groebli, Number 528632 and dated November 6th, 1894. lhe longitudinally movable beams ll and 432, controlled by the jacquard mechanism shown in the said patent, are provided respectively with the angular guides 43 and 44:. In the channels of the guides 13 and all engages a roller or pintle 4-5 carried at one end or'corner of the tanibour frame. By the movement of the beams 41 and 42, through the mechanism shown in said patent the tambour frame is moved in any direction Within its vertical plane of movement.

Operation: When the operating force is applied to the tambour frame by the jacquard mechanism, or any other device used for that purpose, the operating force directly affects one end of the tambour frame and generally but one corner thereof. Or-' dinarily the operating force applied to one end or corner of the tambour frame is trans mitted through the metal of the tambour frame itself to cause the latter to move throughout its length. In the present case however if it be assumed that the tambour frame in Fig. 1, is moved horizontally to the right, the operating force applied at one end of the tambour frame will cause the plates 31, on the left end of the frame to reciprocate relative to the shaft .29 and the 4 movement of the racks 32, relative to the pinions 30 will cause the shaft 29 to revolve, according to the extent of longitudinal movement imparted to the end of the tambour frame. Such revolving motion transmitted through the shaft 29* and its pulley 36 to the straps 38 and 37, will cause a similar rotative movement of equal extent in the shaft 29 through its pulley 36. The rotation of the shaft 29 in the above manner will cause through its pinions 30 and racks 32, a similar horizontal movement to be imparted tothe right hand end of the tambour frame; which movement will be equal in extent and similar in direction to that im parted to the left hand end of the tambour I frame. Since the tambour frame at the left hand end is connected through the racks 32 and pinions 30 at both top and bottom, the tambour frame must move in equal extent at the top and bottom thereof; and this is also true of the opposite end of the tambour frame. As the rotation of the shaft 29 caused by the movement imparted to one end of the tambour frame is accurately transmitted through the straps 37 and 38 to the shaft 2i) and thence to the tambour frame at the opposite end, all parts of the tambour frame will move in equal eX- tent in a horixrmtal direction even though the structure of the tambour frame is comparatively light. By using the straps 37 and 58' and transmitting the operating force longitudinally of their length there is no chance for distortion as would be the case if the movement were transmitted longitudinally of the machine by a long shaft which would be subject to tortional stresses. If a vertical movement is imparted to the tambour frame, or any movement which in cludes a vertical movement, the brackets 31, moving as a part of the tambour frame, will act upon the pinions 3 and cause the shafts 2D and 29 to move up or down, as the case may be, in their journal brackets 27 and 28, so that in whatever vertical position the tambour frame mav be the pinions 30, will always mesh with their racks 32. From the above it will be apparent that any operating force imparted to the tambour frame for causing the horizontal movement thereof will, through the parallel motion device herein act with equal effect upon differentparts of the length of the tambour frame without distorting the latter and without causing vibration thereof. The vertical movement of the tambour frame will always be in parallelism by reason of the ordinary parallel motion device which is described herein and the operation ofv the same may be independent of, and not affect ed by my improved parallel motion device.

Having described my invention, what I claim is I 1. in an embroidering machine, a movable tambour frame and a parallel motion device therefor, comprising shafts. each connected with the tambour frame at different vertical distances from the bottom thereof, said shafts being connected with the tambour frame at or near opposite ends thereof and adapted to cause movements in the tambour frame and to be revolved by the movements of said frame, and means connecting said shafts to cause them to move in unison whereby movements of one portion of the tambour frame will be accurately-produced in other portions thereof.

2. In an embroidering machine, a movable tambour frame and a parallel motion device therefor, comprising shafts, each connected with the tambour frame at different vertical distances from the bottom thereof, said shafts being connected with the tambour frame at or near opposite ends thereof and adapted to cause movements in the tambour frame and to be revolved by the latter, and a strap or band connecting said shafts and arranged to operate in the direction of its length to cause the shafts to move in unison whereby movement of one end of the tambour frame will be accurately produced at the opposite end.

5. in an embroidering machine, a movable tarnbour frame, and a parallel motion device therefor, ernnprising upright shafts, each connected with the tambour frame at different vertical distances from the bottom thereof, said shafts being connected at or near the opposite ends of the tambour frame and adapted to be operated by the latter, a pulley on each of said shafts. and flexible bands engaging in opposite direc tions over said pulleys and having a rocking contact therewith. said bands operating in.

the direction of their length to cause said shafts to move in unison.

4-. In an embroidering machine, a movable tambour frame, and a parallel motion device therefor. embodying shafts each connected with different portions of the tamhour frame, said shafts traveling with said tambour frame in one direction and stationary as to other movements of the said. frame, said shafts being adapted to be revolved by the movement of the tambour frame and means for causing said shafts to operate in unison whereby different portions of the tambour frame will be caused to move in parallelism.

5. In an embroidering machine, a movable tambour frame. and a parallel motion device therefor, embodying upright shafts, stationary journals therefor, said shafts being connected with different portions of the tambour frame and arranged to be reciprocated in their journals by the movements of the tambour frame in one direction and to be revolved by the mo ements of the tambour frame in another direction, and means for causing said shafts to revolve in unison whereby different portions of the tambour frame will be caused to move in parallelism.

6. In an embroidering machine a stationary frame, a movable tambour frame and a parallel motion device therefor, embodving journals on. said stationary frame, upright shafts reciprocatahle in said journals, racks arranged at different vertical distances from the bottom and at or near opposite ends of the tambour frame and movable with the latter, pinions on said shafts arranged to be operated by the horizontal movements of the tambour frame through said racks. means for causing said shafts to reciprocate according to the up and down movements of the tambour frame and means for causing said shafts to revolve in unison. whereby different portions of the tambour frame will be caused to move in parallelism.

7. In an embroidering machine. a stationary frame, a movable tambour frame,

and means for moving the same, means for counterbalaneing the tambonr frame and for causing it to move in parallelism in its vertical movements and means operating independently thereof for causing the tambour frame to inove in parallelism in its horizontal movements, embodying shafts, each connected with the tambour frame at different vertical distances from the bottom thereof, said shafts being connected with the tambour frame at or near opposite ends thereof and adapted to cause movements in said tambour frame and to be revolved by movements of the tambour frame and means connecting said shafts to cause them to move in unison whereby movements of one portion of the tambour frame will be accurately produced at other pertions thereof.

8. In an embroidering machine, a movable t ambour frame and a parallel motion device therefor, comprising a shaft arranged substantially parallel with the end of the tambour frame and a plurality of connections between the tambour frame and said shaft, arranged at different vertical distances from the bottom of the tamhour frame, said shaft being freely revoluble by the movement of the tambour frame in its horizontal direction, through each of said connections, said connections causing the movement imparted to different portions of the shaft to be accurately reproduced at different portions of the tambour frame, said parallel motion device being arranged to permit free vertical movement of the tambour frame.

Signed at St. Gall, in the Canton of St. Gall, Switzerland, this 26th day of March,

MORRIS SCHOENFELD. Witnesses:

CAESAR Loco, FRIEDRICH STEINER.

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