US3877405A - Automatically adjustable apparatus for embroidery stitching - Google Patents

Automatically adjustable apparatus for embroidery stitching Download PDF

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Publication number
US3877405A
US3877405A US444869A US44486974A US3877405A US 3877405 A US3877405 A US 3877405A US 444869 A US444869 A US 444869A US 44486974 A US44486974 A US 44486974A US 3877405 A US3877405 A US 3877405A
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US
United States
Prior art keywords
sewing machine
tension
stitches
workpiece
presser foot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US444869A
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English (en)
Inventor
Adolph S Dorosz
Reade Williams
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
USM Corp
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USM Corp
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Filing date
Publication date
Application filed by USM Corp filed Critical USM Corp
Priority to US444869A priority Critical patent/US3877405A/en
Priority to CA219,981A priority patent/CA1032022A/en
Priority to AU78398/75A priority patent/AU492191B2/en
Priority to GB7499/75A priority patent/GB1495836A/en
Priority to DE19752507544 priority patent/DE2507544A1/de
Priority to FR7505562A priority patent/FR2262143B1/fr
Priority to IT20499/75A priority patent/IT1031929B/it
Priority to JP50022345A priority patent/JPS50141452A/ja
Application granted granted Critical
Publication of US3877405A publication Critical patent/US3877405A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors

Definitions

  • ABSTRACT In a machine for intermittently sewing normal stitches and embroidery stitches, means are provided to automatically adjust the thread tension to a lower level and to simultaneously raise the clearance between the 508 5 3 mw 5 1 b5 52 0 m S "2 "n WW in "r ha S L cm l s Umm unc e 555 [56] References Cited lower reach of the presser foot stroke and the work- UNITED STATES PATENTS piece when an embroidery stitch is to be made.
  • the presser foot which normally reciprocates be tween two positions in coordination with the needle, binds on the thread at its lower point.
  • the standard thread tensions used in normal stitching becomes excessive and cause puckering or tearing of the workpiece.
  • the apparatus provides adjustable limits in the presser foot stroke so that additional clearance may be created to accommodate the bulkier embroidery stitch. Also, a device is constructed which provides for a multilevel thread tension, thereby allowing for a reduced tension when an embroidery stitch is to be formed. A control system connects these devices for simultaneous actuation when the pattern calls for a change from normal stitching to embroidery stitching or the reverse.
  • FIG. 1 is a perspective overall view of the automatic sewing machine
  • FIG. 2 is a perspective view of the tension varying apparatus
  • FIG. 3 is a partial plan view of the tension varying apparatus showing one tension level
  • FIG. 4 is a partial plan view of the tension varying apparatus showing the second tension level
  • FIG. 5 is a perspective view, partially in section, of the presser foot actuating mechanism.
  • FIG. 6 is a block diagram showing the relationship of the control means.
  • the preferred embodiment of this invention is used in an automatically controlled sewing machine as best shown in FIG. 1.
  • This system consists of sewing machine 1 mounted on platform 2 in operative association with the movable workpiece support table 3.
  • the table 3 is moved under the stitching instruments 4 along tracks 5 and 6 by numerically controlled motors 7 and 8.
  • Control console 9 generates signals to activate motors 7 and 8 to move table 3 through a path determined by a digitized pattern which is supplied to control 9.
  • the sewing instruments 4 generally consist of needle 10, presser foot 11, thread feed 14, and a bobbin assembly (not shown) located underneath the workpiece support table 3.
  • Presser foot 11 is reciprocated by a cam in timed relation with needle 10 and may be retracted at the end of the sewing operation by air cylinder 12. Generally, presser foot 11 has an opening 13 through which needle 10 passes during the stitching operation.
  • Thread feed 14 consists of a variety of eyes and pulleys and generally guides thread 15 from a supply spool (not shown) through a variable tension device 16 to the needle 10.
  • the presser foot 11 (FIG. 5) reciprocates through a stroke indicated by dotted lines 17 and 18, the line 18 indicating the lowermost reach of the presser foot.
  • the presser foot 11 When the presser foot is in its lowermost position, there is only a slight clearance between it and the workpiece. This enables the foot to engage the workpiece, thereby facilitating the withdrawal of the needle therefrom.
  • the presser foot 11 may not reciprocate but only be lowered into engagement with the workpiece and retracted atthe end of the operation.
  • a mechanical stop 19 is provided to limit the downward stroke of the presser foot.
  • This stop is engaged by a lug 20 on support bar 21 when the desired lowermost point is reached.
  • the stop 19 is mounted for sliding motion between two positions by air cylinder 22. Each of the positions provides a different limit to the stoke of the presser foot, thereby varying the clearance between the lower reach of the presser foot and the workpiece. As indicated above, it is desirable to raise this clearance when embroidery is to be performed. Adjustment knob 23 may be provided to allow the operator to vary the movement of the stop.
  • the variable tension device 16 (see also FIG. 2) is comprised of the well-known rotary type tension source in which the thread 15 runs about a pulley 35 which is frictionally engaged by a brake operated through plunger 24 to create tension on thread 15 as it is supplied to the needle 11.
  • the tension created by the device 16 may be varied by pressing on plunger 24 to exert greater force on pulley 35.
  • the plunger 24 is actuated by a lever 25 which is pivotally mounted at 26 on mounting bracket 27.
  • Air cylinders 28 and 29 are mounted on bracket 27 with their piston shafts and 31, respectively, extending outward to operatively engage lever 25.
  • a plurality of tensions can be conveniently supplied in this manner.
  • an adjustable mechanical stop 32 is provided to limit the movement of lever 25. Operation therefore of air cylinder 28 will pivot lever 25 until U-bracket 33 abuts stop 32. Since lever 25 extends into the channel 34 of the U-bracket 33, it is free to pivot further, upon operation of air cylinder 29, until it abuts stop 32. It is, therefore, possible to vary the tension levels provided by adjusting stop 32.
  • This apparatus may be also applied to a standard disk type tension device (not shown) wherein the thread is frictionally engaged between two disks.
  • the force exerted by the disks may be varied by a plunger similar to the plunger 24 described herein.
  • Air cylinders 12, 22, 28 and 29 are connected to a source of air, as shown in the block diagram of FIG. 6, by standard electrically controlled valves which control the flow of air to the cylinders. These valves may be made responsive to a control signal which may be generated by the automatic control system when a change in stitching mode is to be inserted in the pattern.
  • the air cyliinders 12, 22, 28 and 29 may also be any suitably controlled devices, for example, fluid, hydraulic or solenoid operated cylinders.
  • control input to the console 9 includes information which triggers a signal when a change in stitching style is directed. These signals are applied to the air cylinders 22 and 29 to simultaneously adjust the presser foot clearance and the thread tension to accommodate the bulkier and looser embroidery stitches. These actuators revert back to normal when the control signal so indicates.
  • a stop element operatively connected to the presser foot to limit its movement
  • Actuating means to adjust the tension device in response to the signal from the control means.
  • means are provided to automatically adjust the sewing machine to accommodate the different characteristics of the stitching modes, as described in claim 1, wherein the means for varying the position of the stop element comprises:
  • a fluid actuated piston operatively connected to the stop element to move said element between two positions;
  • valve means connected to control the flow of fluid to the piston to actuate the change of stop element position in response to the signal from the control means.
  • means are provided to automatically adjust the sewing machine to accommodate the different characteristics of the stitching modes, as described in claim 2, wherein the two positions are such that more clearance is provided between the stitches and the presser foot when the machine is forming embroidery stitches.
  • variable tension device and the associated actuating means comprise:
  • a variable tension device engaging the thread as it is supplied to the needle, said tension device having a plunger for changing the tension on the thread when pressure is applied to said plunger;
  • Fluid piston actuating means operatively connected to pivot the lever in order to apply pressure to the plunger
  • Valve means connected to control the flow of fluid to the piston to actuate the change in thread tension in response to the signal from the control means.
  • the fluid piston actuating means comprises two pistons operatively connected at different positions along the length of the lever to pivot the lever against the plunger, said pistons being positioned to provide at least two levels of tension, one of which providing a relatively low level when the machine is forming embroidery stitches.
  • adjusting means are provided to automatically adjust the sewing machine to accommodate the different characteristics of the stitching modes, said adjusting means comprising:
  • a stop element operatively connected to the presser foot to limit its movement
  • a fluid actuated piston operatively connected to the stop element to move said element between two positions, one position providing a greater clearance between the presser foot and the stitches;
  • Valve means connected to control the flow of fluid to the piston to change the position of the presser foot in response to the signal from the control means.
  • a variable tension device engaging the thread as it is supplied to the needle, said tension device having a plunger for changing the tension on the thread when pressure is applied thereto;
  • Fluid piston actuating means operatively connected to pivot the lever in order to apply pressure to the plunger
  • Valve means connected to control the flow of fluid to the piston to actuate the change in thread tension in response to the signal from the control means.
  • a stop element operatively connected to the presser foot to limit its movement
  • First fluid actuated piston means operatively connected to the stop element to move said element between two positions, one position providing a greater clearance between the presser foot and the stitches;
  • First valve means connected to control the flow of fluid to the first piston means to change the position of the presser foot in response to the signal from the control means;
  • a variable tension device engaging the thread as it is supplied to the needle, said tension device having a plunger for changing the tension on the thread when pressure is applied thereto;
  • a lever ppivotally mounted on the sewing machine for engagement with the tension varying plunger at one end of the lever;
  • Second fluid actuated piston means operatively Second valve means connected to control the flow of fluid to the second piston means to cause a change in thread tension in response to the signal from the control means.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US444869A 1974-02-22 1974-02-22 Automatically adjustable apparatus for embroidery stitching Expired - Lifetime US3877405A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US444869A US3877405A (en) 1974-02-22 1974-02-22 Automatically adjustable apparatus for embroidery stitching
CA219,981A CA1032022A (en) 1974-02-22 1975-02-13 Automatically adjustable apparatus for embroidery stitching
AU78398/75A AU492191B2 (en) 1974-02-22 1975-02-20 Improvements in or relating to automatic sewing machines
DE19752507544 DE2507544A1 (de) 1974-02-22 1975-02-21 Automatische naehmaschine
GB7499/75A GB1495836A (en) 1974-02-22 1975-02-21 Automatic sewing machines
FR7505562A FR2262143B1 (es) 1974-02-22 1975-02-21
IT20499/75A IT1031929B (it) 1974-02-22 1975-02-21 Macchina da cucire automatica
JP50022345A JPS50141452A (es) 1974-02-22 1975-02-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US444869A US3877405A (en) 1974-02-22 1974-02-22 Automatically adjustable apparatus for embroidery stitching

Publications (1)

Publication Number Publication Date
US3877405A true US3877405A (en) 1975-04-15

Family

ID=23766682

Family Applications (1)

Application Number Title Priority Date Filing Date
US444869A Expired - Lifetime US3877405A (en) 1974-02-22 1974-02-22 Automatically adjustable apparatus for embroidery stitching

Country Status (7)

Country Link
US (1) US3877405A (es)
JP (1) JPS50141452A (es)
CA (1) CA1032022A (es)
DE (1) DE2507544A1 (es)
FR (1) FR2262143B1 (es)
GB (1) GB1495836A (es)
IT (1) IT1031929B (es)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4148268A (en) * 1976-10-27 1979-04-10 Durkoppwerke Gmbh Method of and apparatus for the production of button-holes on a double lock stitch buttonhole sewing machine
US4166423A (en) * 1978-02-28 1979-09-04 The Singer Company Adaptive sewing machine
US4301978A (en) * 1979-04-05 1981-11-24 The Singer Company Electro-magnetic thread tension control for sewing machines
FR2515219A1 (fr) * 1981-10-24 1983-04-29 Union Special Gmbh Dispositif d'amenee de ruban pour machines a coudre
EP0158708A2 (en) * 1983-09-30 1985-10-23 Juki Corporation Thread breakage or exhaustion detector for sewing machine
DE3529329A1 (de) * 1985-08-16 1987-02-26 Kochs Adler Ag Vorrichtung an einer naehmaschine zum aufbringen einer zugspannung in einem dem naehprozess zuzufuehrenden material
DE3249689C2 (es) * 1981-05-22 1988-10-27 British United Shoe Machinery Ltd., Leicester, Gb
US20040129191A1 (en) * 2002-11-15 2004-07-08 Hirofumi Tamai Method and system for preventing thread breakage
CN114016223A (zh) * 2021-11-15 2022-02-08 汝州玛雅机电科技有限公司 绣花机压脚控制方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS528361A (en) * 1975-07-10 1977-01-22 Brother Ind Ltd Sewing machine
JPS52104464U (es) * 1976-02-04 1977-08-09
JPS5331448A (en) * 1976-09-01 1978-03-24 Tokyo Juki Industrial Co Ltd Yarn tension controller for sewing machine
JPS5342963A (en) * 1976-09-28 1978-04-18 Tokyo Juki Industrial Co Ltd Yarn tension controller for sewing machine
DE3242509C1 (de) * 1982-11-18 1983-10-20 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Stoffdrueckereinrichtung an einer Naehmaschine
JPH0667426B2 (ja) * 1990-06-01 1994-08-31 クインライト電子精工株式会社 外周縫製装置
DE19918169A1 (de) * 1999-04-21 2000-10-26 Zsk Stickmasch Gmbh Höheneinstellung eines Stoffdrückers

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2008621A (en) * 1934-03-26 1935-07-16 Scott C Mattingly Automatic pressure foot adjusting device
US2396169A (en) * 1941-07-30 1946-03-05 Fredericks Alfred Zigzag stitching machine
US2833237A (en) * 1954-08-16 1958-05-06 Pfaff Ag G M Thread tension release and presser bar lifter
US3667414A (en) * 1970-09-25 1972-06-06 Singer Co Thread tensioning device for sewing machines
US3785309A (en) * 1972-11-13 1974-01-15 Singer Co Thread tensioning mechanism for a sewing machine
US3827382A (en) * 1972-10-24 1974-08-06 Usm Corp Method and apparatus for forming normally appearing stitches

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2008621A (en) * 1934-03-26 1935-07-16 Scott C Mattingly Automatic pressure foot adjusting device
US2396169A (en) * 1941-07-30 1946-03-05 Fredericks Alfred Zigzag stitching machine
US2833237A (en) * 1954-08-16 1958-05-06 Pfaff Ag G M Thread tension release and presser bar lifter
US3667414A (en) * 1970-09-25 1972-06-06 Singer Co Thread tensioning device for sewing machines
US3827382A (en) * 1972-10-24 1974-08-06 Usm Corp Method and apparatus for forming normally appearing stitches
US3785309A (en) * 1972-11-13 1974-01-15 Singer Co Thread tensioning mechanism for a sewing machine

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4148268A (en) * 1976-10-27 1979-04-10 Durkoppwerke Gmbh Method of and apparatus for the production of button-holes on a double lock stitch buttonhole sewing machine
US4166423A (en) * 1978-02-28 1979-09-04 The Singer Company Adaptive sewing machine
US4301978A (en) * 1979-04-05 1981-11-24 The Singer Company Electro-magnetic thread tension control for sewing machines
DE3249689C2 (es) * 1981-05-22 1988-10-27 British United Shoe Machinery Ltd., Leicester, Gb
DE3246014C2 (es) * 1981-05-22 1988-11-10 Usm Corp
FR2515219A1 (fr) * 1981-10-24 1983-04-29 Union Special Gmbh Dispositif d'amenee de ruban pour machines a coudre
EP0158708A3 (en) * 1983-09-30 1987-08-26 Tokyo Juki Industrial Co., Ltd. Thread breakage or exhaustion detector for sewing machine
EP0158708A2 (en) * 1983-09-30 1985-10-23 Juki Corporation Thread breakage or exhaustion detector for sewing machine
US4662294A (en) * 1985-08-16 1987-05-05 Kochs Adler Ag Device at a sewing machine for applying a tensile stress in a material to be fed in a sewing process
DE3529329A1 (de) * 1985-08-16 1987-02-26 Kochs Adler Ag Vorrichtung an einer naehmaschine zum aufbringen einer zugspannung in einem dem naehprozess zuzufuehrenden material
US20040129191A1 (en) * 2002-11-15 2004-07-08 Hirofumi Tamai Method and system for preventing thread breakage
US6840185B2 (en) 2002-11-15 2005-01-11 Muscle Corporation Method and system for preventing thread breakage
CN114016223A (zh) * 2021-11-15 2022-02-08 汝州玛雅机电科技有限公司 绣花机压脚控制方法

Also Published As

Publication number Publication date
IT1031929B (it) 1979-05-10
CA1032022A (en) 1978-05-30
JPS50141452A (es) 1975-11-13
FR2262143A1 (es) 1975-09-19
DE2507544A1 (de) 1975-08-28
AU7839875A (en) 1976-08-26
FR2262143B1 (es) 1980-05-30
GB1495836A (en) 1977-12-21

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