US3821499A - Electromagnetically resettable defect detecting sensor means for deactivating mechanically operable sensor switch - Google Patents
Electromagnetically resettable defect detecting sensor means for deactivating mechanically operable sensor switch Download PDFInfo
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- US3821499A US3821499A US00331730A US33173073A US3821499A US 3821499 A US3821499 A US 3821499A US 00331730 A US00331730 A US 00331730A US 33173073 A US33173073 A US 33173073A US 3821499 A US3821499 A US 3821499A
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- tow
- switch
- sensing element
- support member
- sensing
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- 230000007547 defect Effects 0.000 title claims abstract description 13
- 239000000835 fiber Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
Definitions
- one of the objects of this invention is to provide a novel and improved apparatus for detecting defects in tow.
- Another object of this invention is to provide an apparatus which is sensitive enough to detect a small im-- perfections in a tow yet will not be damaged by' a large knot in the tow.
- FIG. 2 is a fragmentary side view of that portion of I the device which senses defects in the tow.
- a support member 11 made up of a pair of bars 12 secured to a plate 13, the upper ends of the bars 12 being secured to a rod 16 which is pivotally attached to a frame 17.
- a sensing plate 20 positioned between the lower ends of the bars 12 is provided with a curved lower end 21 which is positioned to engage a tow 23 passing over a roll 24, the tow 23 being nipped between the curved end 21 and the roll 24.
- a rod 27 secured to the sensing plate 20 extends through the lower ends of the bars 12 to pivotally attach the sensing plate 20 to the support member 11.
- a switch 28 secured to the plate 13 is provided with an elongated actuating handle 29 which extends downward through an opening in a switch actuator 31) secured to the upper end of the sensing plate 20.
- Nuts 33 threaded onto the switch actuator 30 and positioned on opposite sides of the sensing .plate 20 are provided for adjusting the position of the switch actuator 30 to a point just short of opening the switch 28 when tow without imperfections is passing between the end 21 and the roll 24.
- the switch 28 is connected to a tow cutter (not shown) and a mechanism (not shown) driving the roll 24 and other feed rolls (not shown) so that when an imperfection in the tow 23 moves the sensing plate 20 to open the switch 28 the cutter and the drive mechanism will be shut down.
- a bolt 34 threaded through a nut 35 welded to the plate 13 is provided for limiting movement of the upper end of the sensing plate 20 in a direction toward the switch 28 to thereby prevent damage of the switch when a large knot passes between the end 21 and the roll 24.
- a bolt 41 extends through a slot 41 in a bar 42 welded to one of the bars 12 to a position behind the upper end of the sensing plate 20 to limit movement of the upper end of the sensing plate 21) in a direction away from the switch 28. This is to prevent damage to switch 28.
- a solenoid 45 secured to the plate 13 is provided with a plunger 46 which is positioned to engage the upper end of the sensing plate 20 to push this end in a direction away from the switch to thereby move the switch handle 29 and close the switch 28.
- the solenoid 45 is energized when a manually-operated, normally open push button switch 47 is operated to connect a power supply to the solenoid 45.
- the distance from the switch actuator 30 to the pivotal axis (rod 27) of the sensing plate 20 is much greater than the distance from the pivotal axis to the curved lower end 21 of the plate 20.
- the purpose of this arrangement is to amplify movement of the lower end of the sensing plate 211 so that a very small amount of movement, caused by a small imperfection in the tow, of the curved end 21 results in a much larger movement of the switch actuator 30. Thus, very small imperfections in thetow can be detected.
- the center of gravity of the sensing plate 20 is to one side of the axis of the rod 27 so that the weight of the plate 20 urges the curved lower end 21 into contact with the tow.
- the tow passes between the roll 24 and the lower end 21 of the sensing plate 20. Any imperfec tion in the tow which moves the curved end 21 will cause the upper end of the sensing plate 21) to move toward the switch 28 and thereby open the switch to shut down the cutter and the drive roll mechanism.
- the operator then manually cuts the imperfection from the tow, relaces the tow through the machine to the cutter and then presses the push button switch 47 to energize the solenoid 45. Energization of the solenoid 45 moves the upper end of the sensing plate 20 away from the switch 28 to close the switch and thereby start up the cutter and the mechanism (not shown) driving the roll 24.
- any very large imperfection in the tow such as a knot uniting two tows, will move the sensing plate 20 to shut down the cutter and the roll drive mechanism as described.
- the knot moves the sensing plate 20 until it engages and is stopped by the bolt 34, whereupon the entire unit pivots on the rod 16 to allow the knot to pass between the end 21 and the roll 24.
- the support member 11 Without movement of the support member 11 the knot will bend or break the sensing plate 20 or some other part of the structure, since the roll 24 and the other rolls (not shown) driving the tow have a large amount of inertia and are driven at a high speed. Movement of the support member 11 allows sufficient displacement of the lower end 21 of the sensing plate to allow the knot to pass between the end 21 and the roll 24 without damage to any of the apparatus, the knot stopping shortly after this point.
- An apparatus for detecting defects in a tow of filaments comprising a. a frame,
- a sensing element movably mounted on the support member and having a surface in contact with the moving tow
- a switch mounted on the support member and positioned to be opened by the sensing element when a defect in the tow moves the sensing element, said support member being movable on the frame to carry the sensing element to a position to allow knots in the tow to pass the sensing element, and
- a solenoid mounted on the support member and positioned to engage and move the sensing element to close the switch after it has been opened by a defect in the tow.
- sensing element is pivotally mounted on the support member on an axis positioned at a distance from said surface which is less than the distance from said axis to that part of the sensing element which actuates the switch.
- sensing element is pivotally attached to the support member and has one end in contact with the tow and the other end positioned to actuate the switch, the pivotal axis of the sensing element being between said ends.
- An apparatus for detecting defects in a tow of filaments comprising a. a frame,
- a sensing plate pivotally attached to the lower end of the support member and having a curved lower end positioned to engage a moving tow passing over a roll
- an adjustable switch actuator mounted on the upper end of the sensing plate, said switch actuator being positioned to open the switch when an imperfection in the tow moves the sensing plate, said switch actuator being positioned at a greater distance from said pivotal axis of the sensing plate than the distance from said pivotal axis to the curved lower end of the sensing plate to thereby amplify movement of said curved lower end,
- a pair of stops mounted on the support member and positioned on opposite sides of the sensing plate for limiting movement of the switch actuator relative to the switch
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Abstract
An apparatus for detecting defects in a tow wherein a sensing portion of the apparatus in contact with the tow is movable by small imperfections in the tow to shut down the tow driving mechanism. The sensing element is mounted on a movable support member to allow additional movement of the sensing element when it is engaged by a knot in the tow. The sensing element is mounted in such a manner that a small amount of movement in that portion of the sensing element in contact with the tow results in a much larger movement of that portion of the sensing element which acts to shut down the drive mechanism.
Description
United States Patent 1191 i 1111 ,821,499 3 Marsello et al. June 28, 1974 [54] ELECTROMAGNETICALLY RESETTABLE 3,462,568 8/1969 Smith ZOO/6M3 3,577,955 5/l97l Palmer ZOO/61.42 X FOR 3,619,523 1 1/1971 Tanahe ZOO/6i .41 3,632,918 1/1972 Anson et al 200/6l.4l OPERABLE SENSOR SWITCH [75] Inventors: Bernard D. Marsello; Lindsey T. Primary Examiner-James R. Scott Matthews, both of Decatur, Ala. [73] Assignee: Monsanto Company, St. Louis, Mo. S CT [22] Filed; Feb. 13, 73 An apparatus for detecting defects in a tow wherein a sensing portion of the apparatus in contact with the tow is movable by small imperfections in the tow to shut down the tow driving mechanism. The sensing e1- [2l] Appl. No.: 331,730
52 us. 01. 200/61.13, ZOO/61.41 ement is mounted on a movable pp member to 51 1111.01. H0lh 3/16, B65h 25/14 allow additional movement 9 the Sensing element 58 Field 61 Search 200/6113, 61.18, 61.41, when It IS engaged by a knot the The Sensmg 200/6142; 335/26, 27 element is mounted in such a manner that a small amount of movement in that portion of the sensing el- 5 I References Cited ement in contact with the 'tow results in a much larger movement of that portion of the sensing element I UNITED STATES PATENTS which acts to shut down the drive mechanism. 2,960,731 11/1960 Hogg, ll. 81 al. ZOO/61.13 X
3,301,974 1/1967 Hancock, ZOO/61.13 6 Claims, 2 Drawing Figures L 115 VAC It is conventional in the manufacture of man-made fibers to produce and treat the fibers in tow form prior to cutting the tow into staple. For quality control of the final product it is very desirable that the filaments in the tow be arranged in an orderly manner. Imperfections in the tow can cause undesirable results such as fiber length variations in the staple cut from the tow. Imperfections in the tow may be in the form of tangled fibers, groups of fibers clumped together or even knots where two tows are tied together. In order to improve the quality of the staple it is desirable to remove these imperfections from the tow prior to the cutting operation. This can be accomplished by detecting the imperfections and manually cutting out that part of the tow containing the imperfections.
Various approaches have been used for detecting imperfections in tows. A number of these approaches utilize devices wherein a sensing element of some type rests on the moving tow and, upon movement of the element by an imperfection in the tow, shuts down the tow feed mechanism and the tow cutter. Unfortunately, a device sensitive enough to detect a small imperfection in the tow may be severely damaged by a large knot in the tow while a device constructed so as to be immune to damage from a large knot may not be sensitive enough to detect a small imperfection such as a tangle. With this in mind, one of the objects of this invention is to provide a novel and improved apparatus for detecting defects in tow.
Another object of this invention is to provide an apparatus which is sensitive enough to detect a small im-- perfections in a tow yet will not be damaged by' a large knot in the tow.
Other objects and advantages of the invention will become apparent when the following detailed description is read in conjunction with the drawings, in which FIG. 2 is a fragmentary side view of that portion of I the device which senses defects in the tow.
Referring now in detail to the drawing, there is shown a support member 11 made up of a pair of bars 12 secured to a plate 13, the upper ends of the bars 12 being secured to a rod 16 which is pivotally attached to a frame 17. A sensing plate 20 positioned between the lower ends of the bars 12 is provided with a curved lower end 21 which is positioned to engage a tow 23 passing over a roll 24, the tow 23 being nipped between the curved end 21 and the roll 24. A rod 27 secured to the sensing plate 20 extends through the lower ends of the bars 12 to pivotally attach the sensing plate 20 to the support member 11.
A switch 28 secured to the plate 13 is provided with an elongated actuating handle 29 which extends downward through an opening in a switch actuator 31) secured to the upper end of the sensing plate 20. Nuts 33 threaded onto the switch actuator 30 and positioned on opposite sides of the sensing .plate 20 are provided for adjusting the position of the switch actuator 30 to a point just short of opening the switch 28 when tow without imperfections is passing between the end 21 and the roll 24. The switch 28 is connected to a tow cutter (not shown) and a mechanism (not shown) driving the roll 24 and other feed rolls (not shown) so that when an imperfection in the tow 23 moves the sensing plate 20 to open the switch 28 the cutter and the drive mechanism will be shut down.
A bolt 34 threaded through a nut 35 welded to the plate 13 is provided for limiting movement of the upper end of the sensing plate 20 in a direction toward the switch 28 to thereby prevent damage of the switch when a large knot passes between the end 21 and the roll 24.
A bolt 41) extends through a slot 41 in a bar 42 welded to one of the bars 12 to a position behind the upper end of the sensing plate 20 to limit movement of the upper end of the sensing plate 21) in a direction away from the switch 28. This is to prevent damage to switch 28.
A solenoid 45 secured to the plate 13 is provided with a plunger 46 which is positioned to engage the upper end of the sensing plate 20 to push this end in a direction away from the switch to thereby move the switch handle 29 and close the switch 28. The solenoid 45 is energized when a manually-operated, normally open push button switch 47 is operated to connect a power supply to the solenoid 45.
The distance from the switch actuator 30 to the pivotal axis (rod 27) of the sensing plate 20is much greater than the distance from the pivotal axis to the curved lower end 21 of the plate 20. The purpose of this arrangement is to amplify movement of the lower end of the sensing plate 211 so that a very small amount of movement, caused by a small imperfection in the tow, of the curved end 21 results in a much larger movement of the switch actuator 30. Thus, very small imperfections in thetow can be detected.
It will be seen from FIG. 2 that the center of gravity of the sensing plate 20 is to one side of the axis of the rod 27 so that the weight of the plate 20 urges the curved lower end 21 into contact with the tow. In operation, the tow passes between the roll 24 and the lower end 21 of the sensing plate 20. Any imperfec tion in the tow which moves the curved end 21 will cause the upper end of the sensing plate 21) to move toward the switch 28 and thereby open the switch to shut down the cutter and the drive roll mechanism. The operator then manually cuts the imperfection from the tow, relaces the tow through the machine to the cutter and then presses the push button switch 47 to energize the solenoid 45. Energization of the solenoid 45 moves the upper end of the sensing plate 20 away from the switch 28 to close the switch and thereby start up the cutter and the mechanism (not shown) driving the roll 24.
Any very large imperfection in the tow, such as a knot uniting two tows, will move the sensing plate 20 to shut down the cutter and the roll drive mechanism as described. The knot moves the sensing plate 20 until it engages and is stopped by the bolt 34, whereupon the entire unit pivots on the rod 16 to allow the knot to pass between the end 21 and the roll 24. Without movement of the support member 11 the knot will bend or break the sensing plate 20 or some other part of the structure, since the roll 24 and the other rolls (not shown) driving the tow have a large amount of inertia and are driven at a high speed. Movement of the support member 11 allows sufficient displacement of the lower end 21 of the sensing plate to allow the knot to pass between the end 21 and the roll 24 without damage to any of the apparatus, the knot stopping shortly after this point.
What is claimed is:
1. An apparatus for detecting defects in a tow of filaments, comprising a. a frame,
b. a support member mounted on the frame,
c. a sensing element movably mounted on the support member and having a surface in contact with the moving tow,
d. a switch mounted on the support member and positioned to be opened by the sensing element when a defect in the tow moves the sensing element, said support member being movable on the frame to carry the sensing element to a position to allow knots in the tow to pass the sensing element, and
e. a solenoid mounted on the support member and positioned to engage and move the sensing element to close the switch after it has been opened by a defect in the tow.
2. The apparatus of claim 1 wherein the sensing element is pivotally mounted on the support member on an axis positioned at a distance from said surface which is less than the distance from said axis to that part of the sensing element which actuates the switch.
3. The apparatus of claim 1 wherein the sensing element is pivotally attached to the support member and has one end in contact with the tow and the other end positioned to actuate the switch, the pivotal axis of the sensing element being between said ends.
4. The apparatus of claim 3 wherein a switch actuator secured to said other end of the sensing element is connected to and operates the switch when the sensing element is moved.
5. The apparatus of claim 4 wherein the said pivotal axis is positioned closer to said one end in contact with the tow than to said switch actuator.
6. An apparatus for detecting defects in a tow of filaments, comprising a. a frame,
b. a support member pivotally attached to and depending from the frame,
c. a sensing plate pivotally attached to the lower end of the support member and having a curved lower end positioned to engage a moving tow passing over a roll,
(1. a switch mounted on the support member,
e. an adjustable switch actuator mounted on the upper end of the sensing plate, said switch actuator being positioned to open the switch when an imperfection in the tow moves the sensing plate, said switch actuator being positioned at a greater distance from said pivotal axis of the sensing plate than the distance from said pivotal axis to the curved lower end of the sensing plate to thereby amplify movement of said curved lower end,
f. a pair of stops mounted on the support member and positioned on opposite sides of the sensing plate for limiting movement of the switch actuator relative to the switch, and
g. means on the support member for closing the
Claims (6)
1. An apparatus for detecting defects in a tow of filaments, comprising a. a frame, b. a support member mounted on the frame, c. a sensing element movably mounted on the support member and having a surface in contact with the moving tow, d. a switch mounted on the support member and positioned to be opened by the sensing element when a defect in the tow moves the sensing element, said support member being movable on the frame to carry the sensing element to a position to allow knots in the tow to pass the sensing element, and e. a solenoid mounted on the support member and positioned to engage and move the sensing element to close the switch after it has been opened by a defect in the tow.
2. The apparatus of claim 1 wherein the sensing element is pivotally mounted on the support member on an axis positioned at a distance from said surface which is less than the distance from said axis to that part of the sensing element which actuates the switch.
3. The apparatus of claim 1 wherein the sensing element is pivotally attached to the support member and has one end in contact with the tow and the other end positioned to actuate the switch, the pivotal axis of the sensing element being between said ends.
4. The apparatus of claim 3 wherein a switch actuator secured to said other end of the sensing element is connected to and operates the switch when the sensing element is moved.
5. The apparatus of claim 4 wherein the said pivotal axis is positioned closer to said one end in contact with the tow than to said switch actuator.
6. An apparatus for detecting defects in a tow of filaments, comprising a. a frame, b. a support member pivotally attached to and depending from the frame, c. a sensing plate pivotally attached to the lower end of the support member and having a curved lower end positioned to engage a moving tow passing over a roll, d. a switch mounted on the support member, e. an adjustable switch actuator mounted on the upper end of the sensing plate, said switch actuator being positioned to open the switch when an imperfection in the tow moves the sensing plate, said switch actuator being positioned at a greater distance from said pivotal axis of the sensing plate than the distance from said pivotal axis to the curved lower end of the sensing plate to thereby amplify movement of said curved lower end, f. a pair of stops mounted on the support member and positioned on opposite sides of the sensing plate for limiting movement of the switch actuator relative to the switch, and g. means on the support member for closing the switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00331730A US3821499A (en) | 1973-02-13 | 1973-02-13 | Electromagnetically resettable defect detecting sensor means for deactivating mechanically operable sensor switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00331730A US3821499A (en) | 1973-02-13 | 1973-02-13 | Electromagnetically resettable defect detecting sensor means for deactivating mechanically operable sensor switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3821499A true US3821499A (en) | 1974-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00331730A Expired - Lifetime US3821499A (en) | 1973-02-13 | 1973-02-13 | Electromagnetically resettable defect detecting sensor means for deactivating mechanically operable sensor switch |
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| US (1) | US3821499A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4612842A (en) * | 1985-08-14 | 1986-09-23 | E. I. Du Pont De Nemours And Company | Apparatus for cutting filamentary material |
-
1973
- 1973-02-13 US US00331730A patent/US3821499A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4612842A (en) * | 1985-08-14 | 1986-09-23 | E. I. Du Pont De Nemours And Company | Apparatus for cutting filamentary material |
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