US3782308A - Sewing unit having a stencil rail for guiding the material - Google Patents

Sewing unit having a stencil rail for guiding the material Download PDF

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Publication number
US3782308A
US3782308A US00249398A US3782308DA US3782308A US 3782308 A US3782308 A US 3782308A US 00249398 A US00249398 A US 00249398A US 3782308D A US3782308D A US 3782308DA US 3782308 A US3782308 A US 3782308A
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United States
Prior art keywords
bar
stencil
machine
guide
sewing
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Expired - Lifetime
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US00249398A
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English (en)
Inventor
G Mall
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Pfaff Industriemaschinen GmbH
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Pfaff Industriemaschinen GmbH
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B35/00—Work-feeding or -handling elements not otherwise provided for
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/02—Pneumatic or hydraulic devices

Definitions

  • Sewing unlt comprising a stencil bar drlven 1n longitu- 52 us. (:1. 112/121.1s dihal direction having a Pressure Strip for Sewing s1 1111.131 .0051) 21/00 blanks and a guide bar which Continuously is in [58] Field of Search 112/121.15, 121.12, tiohal engagement with a guide means engaged by 1 12/1211 1 12129 2 support which effects movements superimposed laterally of the longitudinal direction which depend on the [56] References Cited form of the guide bar, where a support plate is mov- UNITED STATES PATENTS able transversely of and independently of the longitudinal movement of the stencil bar. l,942,l28 1/1924 Sommer ll2/l2l.l5 3,001,489 9/1961 Bond et al. ll2/12l.l2 3 Claims, 6 Drawing Figures PATENTED 1 4 30 Fig.5
  • the invention concerns an auxiliary sewing unit for guiding material that is being sewn. More in particular, the invention is concerned with a sewing unit having a stencil bar driven in longitudinal direction and comprising a pressure strip for the material blanks being sewn and a guiding member which is in constant engagement with a guide means received by a carrier for the purpose of effecting movements corresponding to the form of the guide bar which superimpose the longitudinal movement.
  • Sewing units of this type serve preferably for forming long, straight or curved seams such as occur, for example, as sleeve or back seams in the dress and jacket or coat production. In view of the seams that are usually long, such sewing units are frequently also referred to as long seam machines.
  • the carrier is movable transversely of. the longitudinal direction of feed by means of a driving device which is independent of the drive for the longitudinal movement of the stencil bar.
  • the stencil bar that is in force transmitting or positive connection with the guide means and therefore the work blank which is seized by its pressure strip on the blank supporting surface is likewise displaced transversely ofthe longitudinal direction offeed, so that with a long seam machine constructed in this manner it is now possible for the first time on a long seam machine to produce a seam which consists of two partial seams that extend perpendicularly to one another, for example a lock seam on the back portions of a jacket in two operations that immediately succeed one another.
  • the support is defined by a plate disposed ahead of the front end of the head of the housing of the sewing machine extending parallel thereto and adapted to the form of this front end which is displaceably dis posed by means of guiding bars extending in a horizontal plane perpendicularly to the feed in the longitudinal direction of the stencil bar.
  • FIG. 1 is a front view of a sewing unit illustrated in simplified form
  • FIG. 2 is a side view of the sewing unit, partly in sec tion, with the supporting plate resting against the head of the sewing machine,
  • FIG. 3 is a partial sectional side view of the sewing unit with the support plate in the end position removed from the head of the sewing machine
  • FIG. 41 is a detail along lines IV-IV in FIG. 2, and
  • FIG. 5 is a schematic illustration of a jacket back portion having a back closing seam and with the stencil bar disposed thereon.
  • FIG. 6 shows a simplified schematic diagram illustrating the relationship between the electrical and pneumatic structural elements.
  • the sewing unit shown in the illustrative embodiment comprises a frame 1 on which a table top 2 is secured, the top side of which constitutes the support surface for the work blanks.
  • a sewing machine 41 is disposed upon a small extension 3 of the table top 2.
  • the machine comprises a pedestal or column 5, a housing arm 6 and the head 7 having a front end 8.
  • a vertically reciprocable needle 9 is mounted in a conventional manner which for forming stitches cooperates with a catcher that is not illustrated.
  • a motor 10 is provided which is secured to the frame 1 and which is operatively con nected to the sewing machine 4 by means of a drive belt 11.
  • a stencil bar 26 is releasably secured.
  • This consists of a pressure strip 27 for the work blank 28 and a guide strip 29.
  • the pressure strip 27 is provided in the exemplary embodiment proximate its left end with a projection 30 extending transversely of the direction of the sewing machine 4.
  • a guide rod 33 is slidably mounted on bearings 31, 32 in the housing in the upper part of the housing arm 6.
  • a plate 34 is mounted, the shape of which is adapted to the form of the head of the housing 7 of the sewing machine 4 in a manner that the plate 34 registers with the edge of the end side 8 of the housing head 7 except for a laterally extending projection for the guide bar 33.
  • the plate 34 is slidably journalled at its lower end on a guide bar 35 secured in the head 7 of the housing and extending parallel to the movable guide bar 33.
  • the plate 34 is provided at the front end with two bearing projections 36, 37 that are disposed vertically above one another with a space therebetween.
  • a vertically extending support rod 38 is slidably guided in these bearing projections.
  • the guide means for the stencil bar 26 is disposed on the support rod 38. This consists of a plate 39 secured to the lower end of the support rod 38 and two guide rollers 40, 41 disposed on the plate 39 and each rotatable about a vertical axis.
  • the guide bar 29 of the stencil bar 26 extends intermediate these rollers.
  • the guide rollers 40, 41 are retained in operating position by means of a pressure spring 43 acting on an adjusting ring 42.
  • the adjusting ring 42 presents a laterally projecting guide lug 44 which is slidably received in a vertical slot 45 of the plate 34 and thereby prevents turning of the support bar 38.
  • the rearward end of the guide bar 33 is connected by way of a connecting member 46 with the piston rod 47 of a double acting cylinder 48 which is secured laterally of the housing arm 6 as shown in FIG. 4.
  • the two double acting cylinders 22, 23 are connected to a source of air under pressure (not shown) and are controlled together by an electromagnetically operable 4/2 way valve 52 (4 connections/2 circuit positions li E6 the double acting cylinder 48 is controlled by an sqwmaans i aflx3942821 1212) valve (53) which is connected with cylinder 48 by means of a tubular conduit 48.
  • the motor 14 which serves for driving the carriage 16 is supplied with three phase alternating current (phases R, S, T) while motor and the remaining structural elements are operated in the embodiment for the sake of simplicity and clarity by single phase AC (phases T, Mp).
  • a pedal switch 55 is provided that is arranged in a circuit 56 for the valve 52. Furthermore a relay A is disposed in the circuit 56 which has an operating contact A1 that is connected in parallel with pedal switch 55.
  • An operating contact of a double pole end switch 58 is located in the circuit 57 for valve 53 which is actuated by means of a cam 59 secured to the piston rod 24.
  • the second operating contact of the end switch 58 is located in the circuit 60 of the motor 10.
  • a cam 61 is provided on piston rod 47, respectively guide rod 33, which cooperates with a terminal switch 62 that has an operating contact mounted thereon.
  • the terminal switch 62 is located in a circuit 63 in which furthermore the switching magnet of a three pole contactor 64 is located which serves for connecting and disconnecting the motor 14.
  • a three pole contactor 65 is provided by means of which the phase sequence S, T for motor 14 is changed.
  • a terminal switch 67 which has a stop contact is provided that is actuated by a cam 68 which is adjustably mounted on the guide bar or rod 29.
  • a terminal switch 70 having an operating contact 70 is arranged, likewise actuated by cam 68 as well as a relay B which has three closed circuit contacts B1, B2, B3 and a front contact B4.
  • B1 is in circuit 56, B2 in 63, B3 in 60 and B4 in circuit 66.
  • a relay C is disposed in circuit 66 which has a front contact C1 connected parallel to B4.
  • the work blank 28 to be sewn for example the back part of a jacket or coat, is laid out on the right side of the table top 2 (FIGS. 1 and 6) below the stencil bar 26 which is raised up by means of the cylinders 22, 23. As soon as the work blank 28 is straightened out the sewing assembly is connected by operating the pedal switch 55.
  • valve 52 By operating the pedal switch 55 potential is applied to relay A and thereby its operating contact Al is closed. Simultaneously valve 52 is operated which causes cylinders 22, 23 to be supplied with air under pressure so that they lower the stencil bar 26 onto the work blank 28. As soon as the descending stencil bar 26 frictionally contacts the work blank 28 with its pressure strip 27, the two operating contacts of the terminal switch 58 actuated by cam 59 are closed. Simultaneously the valve 53 is switched over, whereby the cylinders 22, 23 are supplied with compressed air in such a manner that they lower the stencil bar 26 onto the work blank 28. As soon as the descending stencil bar 26 with its pressure strip 27 seizes the work blank 28 with frictional engagement, the two operating contacts of the terminal switch 58 actuated by cam 59 are closed.
  • valve 53 is simultaneously switched on and motor 10 is connected, which results in plate 34 together with stencil bar 26 and work blank 28 being withdrawn in the direction of the head 7 of the housing and the machine starts to operate.
  • the short seam of the slot 49 is formed along the projection 30 that extends transversely of the longitudinal direction of transport of the stencil bar 26.
  • the cam 68 is so disposed upon the guide strip 29 that at the point of time that the rearward edge of the work blank 26 arrives below the needle 9 it actuates the end switch 70 so that potential is placed on the relay B.
  • the closed circuit contacts B1, B2 and B3 are opened and thus the motors 10, M are turned off while the valve 52 is again switched back to the position illustrated in FIG. 6.
  • the cylinders 22, 23 are energized in such a manner that the stencil bar 26 is raised and thus frees the work blank 28 which has been finished.
  • the cam 59 moves away from the terminal switch 58 thus opening its operating contacts. This interrupts the circuit 59, and the valve 53 is switched to the position shown in FIG. 6, whereupon the plate 34 and thus the stencil bar 26 is slid into the position remote from the front end 8 of the head 7 of the housing shown in FIG. 6.
  • Such a unit consists of a normally connected compressed air cylinder and an added hydraulic cylinder with a closed oil circuit.
  • the piston rod of the compressed air cylinder is connected with the piston rod of the hydraulic cylinder in such a manner that by actuating the compressed air cylinder, the piston of the hydraulic cylinder is constrained to move along.
  • the feeding velocity may in this connection be influenced by a choke valve built into the oil circuit in that its cross-section for the flow is increased or decreased.
  • the transverse movement of the plate 39 and the guide rollers 46, ill constituting the guide means may also be realized in a manner different from that in accordance with the illustrated embodiment.
  • the guide means may be arranged at the lower end of an essentially vertical lever which is pivotable about a horizontal axis extending parallel to the direction of the longitudinal feed of the stencil bar 26.
  • the cylinder 46 which effects the feed movement in the transverse direction could then directly engage this lever. Since in such an arrangement the lever and the plate 39 assume an oblique position while car rying out a feed movement in transverse direction, the guide rollers 40, 41 must either be arranged for pivotal movement or their surfaces must be of spherical shape.
  • the shape of the seam 50 of the back is determined by the shape of the guide strip 29 that moves between the guide rollers 46, 41. Since the guide strip 29 of the stencil bar 26 which is used in the embodiment shown is rectilinear, also the back seam 56 formed therewith will extend along a straight line. if, however, the guide strip 29 were arcuately shaped, then also an arcuately shaped back seam 56 would be formed. In that event the stencil bar 26 would with the cylinder 48 at standstill and motor M connected would effect movements directed obliquely to its longitudinal extent, the magnitude and direction of which depend on the guide strip and the longtitudinal movement and which are superimposed to the straight line movement of the stencil bar 26 imparted by the motor 114.
  • slot seam does not extend perpendicularly but obliquely with respect to the back seam
  • a slot seam can also be produced in that with the start of the transverse movement of the plate 34! simultaneously also the longitudinal feed of the stencil bar 26 is actuated, and in this manner the work blank 28 is moved obliquely relative to the sewing machine 4.
  • the longitudinal feed of the stencil bar 26 must then take place at substantially lower speed than its transverse displacement.
  • a motor of variable speed could be used. This motor would during the sewing of the slot seam run at correspondingly low speed and upon finishing the slot seam it would automatically be shifted to the higher speed required for the longitudinal feed.
  • Sewing unit for use with a sewing machine having a housing and a machine head, a frame having a table top supporting said machine, a guided shaft extending longitudinally of said housing, a cylinder mounted on the machine and supporting one end of said shaft for movement longitudinally of the machine, a plate secured to the other end of said shaft for supporting guide means and movable with said shaft relative to said machine head, a stencil bar disposed on said table top transversely of said machine head and including a pressure strip for frictional engagement with material blanks below it and a guide strip in constant engagement with said guide means, means operatively related to and extending to the ends of said stencil bar, means for driving said stencil bar in the direction of the longitudinal extent of said stencil bar, said guide means being adapted to effect movements directed laterally of the longitudinal extent of said stencil bar as determined by the shape of the guide strip, said plate and said guide means being movable by said cylinder independently of the longitudinal movement of said stencil bar.
  • Sewing unit in accordance with claim ll including a further shaft mounted in said machine head below said guided shaft, said plate extending parallel to said machine head, and having bearing projections, and said guide means having a support rod in engagement with said bearing projections.
  • Sewing unit in accordance with claim 2 including a cylinder at each end of said stencil bar for raising said bar to place material blanks thereunder.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US00249398A 1971-05-03 1972-05-01 Sewing unit having a stencil rail for guiding the material Expired - Lifetime US3782308A (en)

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DE7116976 1971-05-03

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US (1) US3782308A (it)
JP (1) JPS5315470Y2 (it)
GB (1) GB1379773A (it)
IT (1) IT954531B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107881659A (zh) * 2017-11-24 2018-04-06 阮积康 一种双功能小型模板缝纫机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1942128A (en) * 1930-04-03 1934-01-02 Sommer Ernst Work supporting and guiding means
AT175445B (de) * 1950-06-26 1953-07-10 Franz Sutrich Einrichtung an Nähmaschinen zum Führen aufeinanderliegender und miteinander zu vernähender Stoffteile
US3001489A (en) * 1958-02-17 1961-09-26 Western Coat Pad Company Automatic guided sewing apparatus
US3228364A (en) * 1963-01-14 1966-01-11 Phillips Van Heusen Corp Apparatus for facilitating the attachment of buttons
US3448706A (en) * 1966-11-21 1969-06-10 Clark Co Inc David Variable repetitive pattern sewing machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1942128A (en) * 1930-04-03 1934-01-02 Sommer Ernst Work supporting and guiding means
AT175445B (de) * 1950-06-26 1953-07-10 Franz Sutrich Einrichtung an Nähmaschinen zum Führen aufeinanderliegender und miteinander zu vernähender Stoffteile
US3001489A (en) * 1958-02-17 1961-09-26 Western Coat Pad Company Automatic guided sewing apparatus
US3228364A (en) * 1963-01-14 1966-01-11 Phillips Van Heusen Corp Apparatus for facilitating the attachment of buttons
US3448706A (en) * 1966-11-21 1969-06-10 Clark Co Inc David Variable repetitive pattern sewing machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Sommer, E. Apparatus for Automatic Quilting of Articles of Material Especially Collars *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107881659A (zh) * 2017-11-24 2018-04-06 阮积康 一种双功能小型模板缝纫机
CN107881659B (zh) * 2017-11-24 2023-08-15 浙江川田智能科技有限公司 一种双功能小型模板缝纫机

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IT954531B (it) 1973-09-15
JPS5315470Y2 (it) 1978-04-24
JPS4736644U (it) 1972-12-22
GB1379773A (en) 1975-01-08

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