DE1685060A1 - Sewing machine - Google Patents

Description

HÖGER - LEGAL RIGHT - GRIESSBACH _z HAECKER

PATENT LAWYERS IN STUTTGART 1 R Q R Π R Π

A 35 113 m

do * 132

May 6, 1966

Union Special Machine Company, Chicago, Illinois USA

sewing machine

The invention relates generally to a sewing machine and, more particularly, to an automatically controlled feed device for changing the feed direction one to one • sewing material or the like «

Adjustable drives for the feed mechanism of sewing machines have already been developed (USA patent 3 033 HI) ₈ in which the direction of the front shoe d * n can be easily reversed through the machine, eg with the help of an aero-operated device Reverse levera, in this way to undo bartack loops or other stitches. Further

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BATH ORIGINAL

A 35 113 π »

m - 132

May 6, 1966

the known sewing machines often already have an additional control, which can be influenced by the operator, on a pedal, for example, in order to move the feed mechanism in and out.

The loosening of a seam at the beginning and end of the seam can can be prevented by forming so-called (backwards sewn) backtack stitches. To such a lock to make with the help of known sewing machines, it was previously necessary to adjust the machine speed by eina Reduce operator, the desired number deselect the backtack stitches sewn forwards, then operate the reverse lever, then the Determine the number of stitches sewn backwards and finally switch back to "sewing forwards" to finish the seam. This process required both hands of the operator, which is especially true for the Formation of a bar at the end of a seam was disadvantageous because at this point in the sewing process the Operator should have their hands as free as possible in order to prepare the following fabric parts for sewing «The

1 09819/03

BATH ORIGINAL

A 35 113 m

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May 6, 1966

frequent actuation of the pedal and reversing lever also required vi & time and in the known machines also brought with it further defects in other respects »

The object of the invention _r an improved feed mechanism for sewing machines propose "the automatic reversal of the direction of feed, ^ ror preferably during a predetermined. Duration? _f allows in particular a locking formation at the end, "ines can au run automatically vei'nahencen material"

The advantages achieved by the invention exist, among other things in the fact that the proposed mechanism works and is time-saving and therefore economical = furthermore the proposed feed mechanism can be produced without significant effort and is perfect reliable in its "" effect.

In a preferred embodiment of the invention is a * ¹ sewing machine with a reversible feed

109819/0341

BATH ORIGINAL

1 Ü85060

A 35 113 m

m - 132

May 6, 1966

and a stitch forming device which can be connected to a drive motor via a coupling. The clutch through which the machine is switched on; can be controlled by a pedal. For the purpose of latch formation or the implementation of other Nähopera- W functions in the reverse direction, the machine includes an automatic control system, by means of which the feed direction, separately from the influence of the operator, in a predetermined sequence forward and backward can be controlled, "

According to a further preferred embodiment of the Invention includes the automatic control system scanning means, e.g. at least one photocell and one with it cooperating light source that acts on a specific. Part of the material advanced by the stitch-forming device are directed and trigger the reversal of the feed direction for a predetermined time. Afterward The feed device automatically sets the feed of the sewing material in the original direction again until the seam is finished.

109819/0341
BATH ORIGINAL

A 35 113 m

m - 132

May 6! 966

According to a further embodiment of the invention is an additional photoelectric means provided, which serves to further automate the operational sequence of the machine and the shutdown the machine triggers after completion of the seam. The arrangement is made so that the machine on At the end of the sewing material, a bar is automatically formed and then by itself without any action on the part of the operator switches off «With this embodiment of the invention, the operator is free to continuously Prepare and abandon the parts to be sewn or other ancillary work during the automatic production to make the seam »

In a further embodiment of the invention The automatic operation of the machine is caused by a manually operated control switch, for example can also be operated at any time during the production of the seam.

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BAD ORlGtNAt. -

A 35 113 mt

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May 6, 1966

Finally, the invention also provides that the actuation of the control switch initiating automatic machine operation causes the pedal to be uncoupled from the machine at the same time, if necessary until the machine comes to a standstill after the seam has been completed _{or the like}

The following description of preferred Aüsftihrung _S _ of the invention serves in conjunction with the attached drawings further explanation.

Show it:

Figure 1 is a partially broken away front view of a preferred embodiment of a Sewing machine according to the invention;

FIG. 2 is a partial side view of the machine from FIG. 1 looking from the left;

Figure 3 shows a partial bottom view of the machine taken cover plate;

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May 6, 1966

Figure 4 is a sectional view along the line 4 4 in Figure 3i

Figure 5 shows a Sennit tansient along line 5-5 in Figure 1;

Figure 6 is a sectional view taken along line 6-6 in Figure i;

FIG. 7 shows an enlarged front view dsr shown in FIG. Machine parts;

Figure 8 is a circuit diagram of a FeAlstroslcreis

automatic control di * r Ii, iöLüie *

Figure 9 is a circuit diagram of a further sub-circuit $

Figure 10 is a side view of another embodiment a machine according to the invention and

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Figure 11 is a partial front view of the machine Figure 10ο

On the drawing is a lockstitch Mhmaschine "as iS z.Bc in US Patent 2,977,910 describes _5, DAR

w posed The machine comprises a frame 15 _r which carries a table top 16 »From the table top 16, a vertical stand 17 extends upwards and goes into a horizontally extending? cantilever arm 18 via _fi in turn, free at its end is provided with a head 19 ', the head 19 includes an up and ebbewegliche needle bar 20 of a known type, which one of \

not visible in the drawing drives shaft moves will. This wave runs in the longitudinal direction through the Arm 18 ο The end of the drive shaft opposite the head 19 carries a hand wheel ο combined with a belt pulley 22

The pulley 22 is driven by a V-belt 25 from a pulley 26 below the Table top 16 arranged and one with a Seidce

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May 6, 1966

combined clutch brake mechanism 28 is connected. the other side of which is driven by an AC motor 30 or other suitable drive shaft. The coupling brake mechanism 28 can be of the type as described in U.S. Patent 2,739,251. The mechanism 28 comprises an actuating pin 34 »the can be moved from the position shown in Figure 1 to the left and in engagement with the coupling part of the mechanism. This transmits driving power from the motor 30 to the pulley 26, whereby the Needle bar 20 over belt 25 and belt pulley 22 and the drive shaft in arm 18 is driven. By moving the bolt 34 to the right, the clutch is disengaged and the pulley 26 and the through they driven feed "and stitch-formation mechanism shut down. The motor 30 is via a cable 36, a Main switch 37 and a plug 38 power carried out.

The actuation bolt 34 is moved via an angle lever 39 which is pivotably mounted on a pin 40 arranged in the vicinity of its one end is * the other end of the lever 39 iat in adjustable

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Way attached to a substantially flat plate 41. The plate 4-1 also carries an articulated Hsbel protruding upwards, the one nearby, his cranked at the top and at this point with a Armature 43 of a clutch electromagnet 44 is connected. This magnet is carried by a plate 45, which is attached to the housing of the motor 30. On the plate 45, a brake magnet 46 is also coaxial with a to anchor 43 arranged anchor 47 attached. The brake magnet 46 is adjustable by means of screws 48 on the Plate 45 held and adjusted} that its anchor 47 is seated in the solenoid when the magnet is switched on. The armature 43 of the magnet 44 is similar Way adjusted that the angular relationship between the lever 39 and the plate 41 by means of screws 49 is adjusted "

The opposite end faces of the armatures 43 and 47 are firmly connected to one another so that move the anchors together. After switching on the clutch magnet 44, both armatures 43 and move

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May 6, 1966

together with the lever 42 down, causing the lever pivoted counterclockwise about the pin 40 and the actuator 34 is moved so that the coupling parts of the mechanism 28 are engaged. On the other hand, switching on the brake magnet 46 pulls the He7: el 42 afterwards up and versehwenlrfc the lever 39 clockwise, so that the bolt 34 is pushed so that a safe Braking effect occurs.

A pull rod 50 is angcoröns' · between the plate 41 and a pedal 51. The Sestänge 50 "consists of two rods 52 and 53? N extend parallel to each other the mutual propriety τοη eggs plate ■? After ιιολ * *. The upper end of rod 52 Is- mi-% a ball joint 54 at ö <r * At the level of its lower end, a clamp 55 is placed on the rod 52. The rod 53 is held on the pedal 51 by means of a ball joint 56 and extends upwards from there, where it is slidable in a corresponding opening in the clamp 55 lies"

12th

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A 35 113 m

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6th time 1966 "*

A release clamp 58 is disposed on rods 52 and 53 between plate 41 and bracket 55. The clamp 58 is firmly connected to the rod 52 by clamping screws 59 * which can best be seen from FIGS. 6 and 7. Is on the terminal 58 urn * _s a vertical axis a lever 60 mounted, which is held 53 in the position shown by einr coil spring 64 resiliently in a notch 62 of the rod. The catch 62 wirü of a portion of the rod formed with a reduced diameter _F 60 normally prevents the latched lever rsrtikale a relative movement between the rods 52 and * Z so DAC. The lever 60 is connected by a horizontally selling handlebar 65 to a magnet 66 releasing the pedal (FIG. 1). JJach switching on, the Kagneten 66 is the lever verachwenkt 6C inn from the position shown in Figure 6 position in Gegenuhrseiger &, ^ ss wodurcb uln free displacement of the rods 52 and 53 allows relatively zrvi.nander. •• r -.- tfi

The fabric feed direction dif bsa beaten in Figures 3 - · 5 recognizable irit, includes a #. calibrate horizontally

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extending drive shaft 70, which is mounted under the table top 16 and connected to the drive shaft arranged in the Arai 18 by a gear (not shown) located in the stand 17. The drive shaft 70 is used to generate a composite, extending in four calibration DEVICES Führungsbewsgung a fabric "pusher rod 71 and one connected to said rod feed dog 72 (Figure 4) ° as in one one in the already mentioned US Patent 3 033 Ή1 _s ibeschrieben comprises di? 3 Yfelle 70 on an exsater 74, which is connected by a link 75 with an arm 76 protruding towards unfcezi of the knife rod 71. When the shaft 70 is wired, the front end of the rod 71, located on the right in FIG Link 79 is connected to an iron swing arm 80, which is pivotably mounted on a fentfitehond horizontal nozzle 81. The rocker 80 had an arched backdrop 80 "which is essentially the same distance above; · and below-

14th

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BADORJOiNAL

A 35 113 m

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6 ₀ May 1966 Jk.

half of the axis 81 extends. The Kulisae 82 leads a sliding block 83 »which through a. Lenksr 84 with the downwardly protruding arm 76 of the knife = rod 71 is connected. When the drive shaft 70 rotates, the rocker 80 transmits its ossillation movements via the stone 83 to the handlebar 84 and the arm 76 in order to impart a horizontal reciprocating longitudinal movement to the material pusher rod 71 and the material pusher 72 . Piping horizontal movement is with the feed dog conferred by the cam 74 vertically up and down going Ossillviionsfos · - superimposed movement, so that the feed dog -ine describes substantially elliptical path, this wii under the loading eye ζ calibrate 85 Darg 33 in Figure 4 shares iot.

The direction and extent of movement (the amplitude) of the knife gate valve 72 on its elliptical ·! Orbit is determined by the Stelluug doe Steines 83 in dar Eu'.issa 82. When the stone 83 in the backdrop 82 above the axle 81 is stationary, the knife slide 72 moves open

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its path in a direction in which that to be sewn Material pushed forward through the aone becomes (Figure i). If the stone 83 is below the axis, the knife slide moves in the opposite direction The greater the upward or downward displacement of the stone 83 from its dead center, the more so bigger is it? Longitudinal movement of the fabric slide »Up In this way you can increase the stitch length.

As best shown in Figures 3 and 5, a curved HaTx ¹ I 86 connects the Stei.η 83 rait the end ö) ae? Scn & ukc & welle 87. Me wave 87 is supported by νκν ^ ΜώεΙΙ »of PJGchpla ^^ rt 16 with a distance parallel to / Uits-ie'bsn» j each 70. 3) ae other end "of the swing shaft 87 is (Irreh armt; connected 88 and 89 with a forward to erstreckendem shaft 90" The shaft 90 is a Umkfhrhttu ""} 3 (Figure i.?) Rüst.et excluding "? , which is operated either manually by the control unit or automatically by a return magnet 94. The magnet 94 eats on the

16 -

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BATH ORIGINAL

1 b 8 5 O 6

A 35 113 DJ

m - 132

6 ο May 1966 π

Stand 17 held divisible by screws 95. After moving the lever 92, starting from the position shown in FIG so that the Yorschubeinrichtung in Vorwärtöriehtung moved wirdo Conversely entails a movement of the lever 32 in a clockwise direction the stone 83 gradually below the level of _β axis 81 so that the reversed forsehufer.ichtung

The reversing magnet 94 is controlled together with the clutch magnets 44 _s, the brake magnet 46 and the pedal release magnet 66 by a lever 97 and two photo cells and 99 with associated light sources 100 and 101. The lever 97 is mounted on the surface of the table top .1.60 .. and includes two normally open switching contacts 103 and (04, of which only the contacts 103 are visible in FIG. 1. If the lever 97 moves from the position shown in FIG moved to the right, the contacts 103 and 104 close and initiate the automatic operation of the sewing machine »

17 -

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May 6, 1966

The light source JOO for the photocell 98 is clamped to the head 19 directly above the stitch image area. It directs its bundle of light downwards through a transparent plate in the table 16, not visible in the drawing, onto an underlying prism 105. The prism 105 deflects the light beam at a right angle and directs it onto the photocell 98o attached below the table top and the light source 101 the photocell 99 are on the feed side of the stitch formation point »d» h. clamped in Figure 2 to the right of the needle "to the head 19 _β The Lidit - bundle the latter light source is reflected by the throat plate on the photocell 99th

The switching contacts 103 and 104, the photocells 98 and 99 and the light sources 100 and 101 are electrical in one Control circuit connected to the on and off of the clutch magnet 44 »of the brake magnet 46 and the Pedal · release magnet 66 is used in each corresponding time related to one another. Various switching elements of the control circuit are fastened to an upright rod 109 above the table top! 6 Control box 108 arranged These elements

118

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SAO ORlGINAt

1685050

A 35 113 m

m - 132 _{| Λ}

May 6, 1966 yfg

accommodate five two-Stallunga switches 110 Ms 114 and one Control lamp 115 »which shows the switching status of the control current circle shows "Flares are in the switch box 108 a rheostat 117 which determines the duration of the braking effect controls on the machine, as well as a donkey stand 118 to control the duration of the reversal of the substance = Feed.

The control flow circuit is shown schematically in two parts in FIGS. 8 and 9. The sub-circuit shown in FIG comprises the photocell 98 with its light source and is used to switch on the automatic machine operation and to stop the machine after the seam has been completed includes the photocell 99 with associated light source 100 and is used to control a ßiegelbildug what by The reversing magnet 94 is switched on. In the control circuit, the switch-on positions are periodic Relay contacts are shown with continuous lines and the switch-off positions with dashed lines.

! 9

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T9

As can be seen from FIG. 8, the circuit has lines S20 and 121 which lead to the poles of a V AC source 122 via the two-position switch. The control lamp 115 lies between the lines 1PO ₅ . 121 and lights up when switch 110 is closed, indicating * that the circuit is on. The motor 30 is connected to the power source 122 via lines 119 and 123 as well as the switch 37 «

The lines 120 and 121 feed a photocell _{current circuit P} which is shown schematically in Figure 8 and with the reference number 1 £ 4 bcseiehaet * The circuit 124 is of a known type and Vriirtet bet urrta des from the light source 100 to the photocell 98. g Jj 'ic light beam generates an output signal. This signal excites a relay 125, whose contacts 126 are normally open. One of these contacts 126 is connected to the line 120 via the switch m, while the other contact via the coil 128a of a MulU contact relay 128, a line 1291 the manually operated contacts 103 and lines 130 and 131 to the line 121 leads "

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109819/0341 BATH ORIGINAL

Λ 35 113 » ^1ti85060

m - 132

6th shark 1966

IO

The relay 128 has normally open contacts 132 and 133 and changeover contacts 138, 139 and HO. Me Contacts 132 are between the line 129 and the common end of the lines 130 and 131 «After energizing the relay 128, the contacts 132 get into the closed position (dashed line) and thereby close a holding circuit for the coil 128a. One the contact 133 is connected to the supply line 120 via a line 135, while the other contact leads to a parallel circuit in which the clutch magnet 44 and the pedal release magnet 66 are = Der The circuit closes via the switch i1 £ and a Line 136 to line 121.

The changeover contacts of the relay 128 comprise a movable contact 138 and two fixed contacts 139 and 140. The movable contact 138 is connected to the negative electrode of a capacitor 142, the positive electrode of which leads via a line 143 to one end of an Rsslaisspule 145 »The other end of this coil is through a® Line 146 connected to the fixed contact 139. In parallel with the relay coil 145 are a resistor 147 and the

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with the latter in series connection resistor 117. In addition, the anode of a diode rectifier 148 is connected to the line! 43, while the cathode of the Rectifier leads through a resistor 149 to the line. In the switched-off state of the relay 128 is the movable contact 138 on contact 139. ! fold the When the relay is switched on, contact 138 moves from contact 139 to contact 140, whereby the circuit from capacitor H2 via contacts 138 and 140 is one Line 150 to line 120 is closed.

The relay coil 145 are normally open contacts 152 associated with that between the line 120 and the one End of the coil of the brake magnet 46 lie. The other The end of the solenoid is connected to the line via switch 113 121 connected.

In the control circuit shown in FIG. 9, lines 120 and 121 are based on the alternating current source 122 connected to a photocell bromine circuit 155. The current-

22nd

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A 35 113 m

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May 6, 1966

Circuit 195 essentially corresponds to circuit 124 according to Figure 8 and is used to generate an output signal which energizes the coil of a relay 156 when the light beam from the light source 101 to the photo cell 99 is interrupted. The relay 156 normally has open contacts 157. One of the contacts 157 is through one line 158 connected to line 120, while the other contact to one end of a coil 160a of one Multi-contact relay 160 leads.

The relay 160 has a first set of transmissions that include a moving contact 162 and two fixed contacts 163 and 164. The movable contact 62 is connected to that end of the coil 160a which faces away from the end connected to the supply line 120. The fixed contact 163 is via the manually operated switch 104 and lines 165? 166 connected to the line 121, while the fixed contact 164 leads to the common end of these lines "After switching on the heater 160, the contact 162 moves from the contact 163 to the contact 164 and closes a holding circuit of the relay 160.".

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The relay 160 also has a movable contact 167 and two fixed contacts 168, 169 · The contact 167 is connected to the negative electrode of a capacitor 170 »whose positive electrode via a line 171» a hot coil 172 and a line 173 to the fixed contact .168 leads. A resistor 175 in series with the variable resistor 118 is connected in parallel to the hot coil 172 between the lines 171 and 173. The line 120 is connected to the contact 169 via a line. Normally open contacts 182 are assigned to the relay pulse 172, which are located between the supply line 12.0 and one end of the coil of the reversing magnet 94. The other end of the coil of the reversing magnet 94 leads via the switch 114 to the line 121 _β

At the beginning of a sewing operation, an operator closes <Ίθ switches 110-114 on switch box 108 (FIG. 1).

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■ 1b85060

A 35 113 m

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May 6, 1966 *.

In addition, the motor 30 is switched on via the switch 37. The parts to be sewn are then placed together on the table top 16, where the fabric pusher 72 (FIG. 4) guides them over the stitch-forming zone. The movement of the stitch-forming device and the fabric slide 72 is initiated by stepping down the pedal 51 and the associated pulling down of the pull rod 50, whereby the angle lever 39 pivots counterclockwise around the pin 40 and the actuating bolt 34 moves to the left, so that the coupling of the clutch -Brake mechanism 28 is engaged. During the manual control of the machine, the stitch formation and feed mechanism can be stopped if the pedal is moved in the opposite direction. The bolt 34 moves to the right, so that the braking part of the mechanism 28 comes into effect. If the operator wishes to reverse the feed direction during the production of the seam, ζ.Bo in order to form a bar at _{the beginning of the seam 9} , the reversing lever 92 is actuated, whereby the movement of the material slide on its elliptical path is reversed in the manner described above.

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When the operator of the machine moves the beginning or the leading edge of a sewing material into the stitch formation zone brings, the light beam from the light source 100 to the photocell 98 is interrupted, so that the coil of the relay (Figure 8) receives a signal and the relay is energized. As a result, the relay contact 126 is closed the multi-contact relay 128 preparatory to a phase (Line 120) put »The relay 128 remains switched off due to the open contacts 103» In in the same way, the front edge of the sewing material which runs through under the light source 101 (FIG. 9) interrupts the associated sewing material edge Light beam, whereby the coil® of the relay 156 receives an output signal, is excited and the contacts 157 closes «When these contacts close, one side of relay coil 160a is connected to line 120, the relay 160 remains off, however, because the contacts 104 between the other side of the coil 160a and the line 121 are open «, The Maschhe is now for prepared an automatic operational sequence.

The formation of the seam is now continued under the control of the pedal 51 until the operator

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BATH ORIGINAL

λ 35 113 m

m ~ 132 % L.

May 6, 1966 **

actuates the lever 97 for the automatic control, which can be done at any point during the formation of the seam. After actuating the lift lever instantly enclose contacts 103 and 104 ″ as a result, the machine is automatically controlled via the clutch magnet 44, the brake magnet 46, and the pedal release magnet 66 and to initiate the reversing magnet 94 "

As can be in Figure 8 taken, is _"(contact relay closed by closing the contacts 103 of the circuit to the coil 128a of the multi 128th This circuit passes' through the line 120, the switch 111 and the relay contacts 126 on the one end of the coil 28a and from the other end of this coil via line 129 "the contacts 103 and lines 130 and 131 to line 121." The relay 128 is thus switched on, whereby the contacts 132 and 133 close and the contact 138 from contact 39 to the contact 40. Closing contacts 132 closes the holding circuit for the relay coil, while closing contacts 133 energizes clutch magnet 44 and pedal release button 66.

* - = 27 =

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The inrush current of the magnets 44 and 66 can run back from the supply line 120 via the line 135 and the contacts 133 to one end of the respective associated magnet coil and from the other end of the coil via the switch arm 112 and the line 136 to the line 121 _β When the contact 138 from Contact 139 is moved to contact 140, closes a circuit that stood from line 120 via line 150 and contacts 138, 140 to the negative electrode of the capacitor 142 and from the positive capacitor electrode via the rectifier 148 and the resistor 149 to the line 121 leads. The capacitor 142 is charged by this direct current circuit »

Switching on the coupling magnet 44 (FIG. 1) moves its armature 43 ″, the lever 42 and the plate 41 downwards. As a result, the angle lever 39 pivots about the pin 40 and presses the actuating pin 34 of the clutch / brake mechanism 28 in a direction in which the clutch remains engaged. At the same time, by switching on of the pedal release magnet 66 of the lever 60 from the position according to FIG. 6 la counterclockwise so that

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he got out of the haste 62 of the rod 53. if the lever 60 is pulled out of the catch 62 «the rod 53 can be axially free with respect to the rod 52 move". The connection between the pedal 51 and the clutch »brake mechanism 28 is thus interrupted, as long as the magnet 66 remains switched on.

If, due to the actuation of the lever 97, the
Contacts 104 (FIG. 9) close, the switch-on circuit for the coil 160a of the relay contact is closed. This circuit initially runs from line 120 via line 158 _S to relay contacts 157 _S to coil 160a, relay contacts 162 and 163s to contacts 104 and lines 165 and to line 120. After relay 160 is switched on, contact 162 moves from contact 163 to contact 164 »which closes a holding circuit for winding 160a and contact 167 from contact 168 to contact

t.

169 is moved. The touch of the contacts 167 and serves to connect the negative side of the capacitor

170 Äit the line 120, whereby the capacitor is charged

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However, the relay coil 172 remains in this Time switched off «because the circuit between the Contacts 167 and 168 is interrupted "

When the end or the rear edge of the sewn material reaches the stitch formation point, the interruption of the light beam from the light source 101 is canceled and the relay 160 were switched off o The contact 167 then moves from the fixed contact 169 to the fixed contact 168, whereby a discharge circuit for the capacitor 170 via the recirculation coil 172 is established. The relay coil 172 is thus switched on for a period of time which depends on the time constant of the capacitor 170 »the size of the variable resistor 118 and the resistor 175. By switching on the relay coil? » 172, the contacts 182 are closed and the reversing magnet 94 is switched on , whereby the lever 92 is moved to the right in the figure and the direction of the material feed is reversed, as previously described.

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As previously mentioned, the light source 101 is on the supply side of the stitch formation, the light source lies in such a way that the reversing magnet 94 is excited at the same time as the end of the sewing material Runs through the stitch formation point and the last stitch is producedc The feed mechanism now moves like this long in the opposite direction until the capacitor 170 is discharged so far that the relay 172 drops out. While the discharge of the capacitor is represented by dsr Stitch formation mechanism e.g. 6 to 12 backwards Jker, which on the End of sewing material the forward stitches überlagsraio Nacä dea switching off the relay coil 172 open the contacts 182 and switch off the reversing magnet 94 «Dai / orschiifriaechanisiaus now moves automatically in "forward direction, so that another row of stitches is made at the end of the seam will"

When the end of the material passes the light source 100 (Figure 8) hate the light beam hits the photocell 98 again, and relay 125 is turned off. After the relay has been switched off, the contacts Ϊ26 open - this causes them to switch

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the multi-contact relay 128 from, which in turn the contacts 132 and 133 are opened. By opening the contacts 132, the holding circuit for the relay coil 128a is interrupted, while by opening the contacts 133 the clutch magnet 44 and the pedal "would be released = magnet 66" are switched off. The magnet 44 thus does not act very much on the actuating bolt 34 ^: (Figure 1) of the clutch / brake mechanism 28, so that the clutch is no longer held in the engaged position 7) free. The lever 60 thus slides until it eventually comes along with the latching _s to cover on the rod 53rd The spring 64 now sees the lever into the detent, so that the connection between the pedal 51 and the clutch / brake mechanism 28 is re-established.

Switching off the multi-contact relay 128 also causes the movable contact 138 to move away from the fixed contact 140 moved to the fixed contact 139. This creates a

32

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A 35 113 m

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May 6, 1966

electrically conductive connection * the capacitor 142 discharged through the relay coil 145. This will make the Relay contacts assigned to this coil are energized during such a period of time by the time constant of the Capacitor 142 and the size of the variable resistor 117 as well as the resistor 147. When the relay coil 145 is switched on, the associated contacts 152 closed, which in turn activates the brake magnet 46 leads »This causes levers 42 and 39 (Figure 1) moved in a direction in which the braking part of the Clutch braking mechanism in the previously described This way, the stitch patterns and the feed mechanism of the machine become fast and automatically stopped

The variable resistor 117 is adjusted by the operator so that the capacitor 142 entlädtβ with safety during a sufficiently long time on the Relaiespule 145 so that the brake magnet 46 so long excited _f remains completely until the machine is still "Similarly,

f.

the variable resistor 118 is set to a predetermined rate

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A 35 113 ω

m - 132

δ ο May 1966

set during which the then excited reversal ^ magnet 94 reverses the feed direction. The resistor thus offers a way of properly controlling the length of the bolt.

In the figures 10 and 11 a part of a sewing machine 185 is shown together with a further embodiment of the invention * The machine 185 has © ine light ~ source 186 and a cooperating photocell 187 _o Both bodies are provided with a holder 1.fc0an a Plate 188 fastened. Another light source 190 and a photocell 191 assigned to it are fastened to a plate 193 in the same way with a holder 192. The plates 188 and J 93 are in turn adjustable by means of screws 195 on a carrier plate 196. The plate 196 is arranged on the upper part of the machine head 197. By loosening the screws 195, the plates 188, 193 and thus the associated photocells and light sources can be quickly "adjusted"

From the light sources I86 »190 and the photocells i87 _s 191 run four elongated rods 200, 201, 202 and

■ ~ 34 109819/0341

BAOORJGiNAL

A 35 113 η

m ~ 132

May 6, 1966

203 down. These rods are made of plexiglass or another transparent, light-guiding material. Bie upper ends of the rods 200 and 202 are secured by a bracket 205 to the plate 188, while the upper ends of the rods 201, 203 t means of a holder are held on the board 193 206th The lower ends of the respective pairs of rods are held separately by corresponding brackets 207 and 208 and aligned with a reflective needle plate 210 of the machine at a distance from one another.

When the machine is in operation, the light beam transmitted from the light source 186 via the rod 200 is from the The throat plate 210 is reflected so that it reaches the photocell 187 via the rod 202. The The light beam from the light source 190 via the rod 201 is reflected by the throat plate 210 and passes through the Rod 203 in the photocell 19 i-Bisse light beams are interrupted when a front web edge over the stitch formation point of the machine runs away. Be the light sources 186, 190 and the photocells 187, 191 are analogous to the light sources 101, 100 and the photocells 99,

109819/034 1 ³⁵

BATH ORiGiHAt

A 35 t13 a

m - 132

6th quay 1966

98 electrically connected to one another in the manner previously described. By arranging the transparent rods too 200 to 203, the light sources 186, 190 and the photocells 187 »191 can be arranged near the top rope of the machine at a distance from the stitch formation zone, so that the operator has a good view of the seam formed.

In the illustrated embodiment of the invention, the various photocells, light sources and associated circuits are used to carry out certain monitoring and control functions when the end of the sewing material appears at the stitch formation point of the machine. In a further preferred embodiment of the invention, the photoelectric elements react to certain pieces of dough of the sewing material, which for this purpose a different Pa ^ e ₉ a different pattern or the like. Or a light beam or the photocell influencing marking at a predetermined point of the The sewing machine's photoelectric control elements can also be influenced in such a way that the feed direction changes, for example, for the purpose of forming a bar.

109819/0341

BAD OWQJi ^

Claims (1)

1685ÜB0 A. 35 113 m m - 132 May 6, 1966 Patent claims: 1. Sewing machine with drive motor, stitch forming mechanism and irreversible feed device for optional pre-stealing of the sewing material in two mutually opposite directions, characterized in that scanning means (98.99 »100.101) are provided in the vicinity of the stitch-forming zone of the machine, which when certain parts of the The sewing material, e.g. the edge of the sewing material, and a die Confirm the reversing device (92,94) that changes the feed device of the sewing material. 2. Sewing machine according to claim 1, characterized in that the scanning means (98,99,10O ₉ 101) and the reversing device (92,94), for example for the purpose of a bolt formation, is assigned an electrical circuit (170) with a time constant which the Feed device reverses only for a predetermined period of time and then switches on the original feed direction again. 109819/0341 BAD ORfGfNAL A 35 113 m m ~ 132 May 6, 1966 H- 3. Sewing machine according to claim 1 or 2> V characterized "that the scanning means comprise photocells (98.99) and light sources (10O ₉ 101) and the light beams directed from the light sources onto the photocells can be interrupted by the advancing sewing material" Sewing machine according to claim 1, 2 or 3 »characterized > That the reversing device (92) can optionally also be operated manually ο 5c. Sewing machine according to one of claims 1 = 4 »characterized in that one to be operated by an operator Control element, preferably a pedal (51), is provided for coupling the feed device (72) to the drive motor (30) " 6ο Sewing machine according to one of the preceding claims, characterized in that electromagnets (44, 46) are provided which couple the feed device (72) with the drive motor (30) and after the sewing process has ended the coupling (28) between the feed device - 3 = 109819/0341 BATH ORIGINAL : Λϊ -. Κί-Α A 35 T13 m m - 132 May 6, 1966 and release the drive motor and brake the machine. 7 «Sewing machine according to one of the preceding claims, characterized in that a hand lever (97) for Switching from manual to automatic operation of the ■. - ■ -r machine is provided. Sewing machine according to one of the preceding claims, characterized in that a first photocell (98) with an associated light source {100) via a relay (σ28) has a Clutch magnet (44) »a sine pedal release on» direction (60,62) actuating magnet (66) and a brake magnet (46) controls, while a two "β photocell (99) with associated light source (101) actuated a reversing magnet (94) via a relay (160) * which changed the direction of advance for a predetermined period of time 9 «Sewing machine according to one of the preceding claims, characterized in that the photocell (98) when interrupted the light bundle s from the light source (100) of the; the relay 109819/0341 iÄfc'i-rj '- ". ™; ": ■' " BAD ORIGINAL A 35 113 ■ m - 132 6 "Shark 1966 (128) containing circuit prepared so that when Pressing the switch (97) responds to the relay (128). 10. Sewing machine according to one of the preceding claims, characterized in, that the photocells (187,191) and Light sources (186,190) Light guide rods (200,201,202,203) assigned., 109819/0 341 BAD ORIQINAt.