US2904872A

US2904872A - Stop motion device

Info

Publication number: US2904872A
Application number: US514935A
Authority: US
Inventors: Chadwick B Kingsbury
Original assignee: North American Rayon Corp
Current assignee: North American Rayon Corp
Priority date: 1955-06-13
Filing date: 1955-06-13
Publication date: 1959-09-22
Anticipated expiration: 1976-09-22

Description

Sept. 22, 1959 1 c. B. KINGSBURY STOP MOTION DEVICE Filed June 13, 1955 2 Sheets-Sheet l l m H T B N m S Wm n 1 I. A LIN K. @B m O Ow w A H. c w Svmh Svwm@ SV fl OUA- w @Q Q Yi l u Sept. 22, 19,59

Filed June 13, 1955 C. B. KINGSBURY STOP MOTION DEVICE 2 Sheets-Sheet 2 2222 FIL-ad |24/ Maf-de F I G. 8.

fig INVENTOR gf CHDWIOK BJGNGSBURY ATTORNEY United States Patent O STOP MOTION DEVICE Chadwick B. Kingsbury, Elizabethton, Tenn., assigner to North American Rayon Corporation, New York, N.Y., a corporation of Delaware Application June 13, 1955, Serial No. 514,935

8 Claims. (Cl. 21S-71.4)

This invention relates to a stop motion device adapted for use in yarn stretching apparatus. More particularly this invention relates to an electrical switch control for a stop motion device.

An object of this invention is to provide an improved stop motion device for use in yarn stretching apparatus.

Another object of this invention is to provide an improved electrical vswitch control for a stop motion device.

Still another object for this invention is to provide an improved thread tension sensing leverage for stop motion devices.

A further object of this invention is to provide an improved thread tension responsive leverage that is spring urged in a certain direction against the tension yof the thread by the spring tension of a resilient electrical switch control member.

Still another object of this invention is to provide a sensitive thread tension sensing leverage of improved construction into which the thread may be relatively easily inserted.

Still another object of this invention is to provide an electrical stop motion control of simple and substantially fool proof construction that may be employed for controlling individually driven yarn stretching units.

Still another object of this invention is to provide an electrical stop motion control switching arrangement of simple and substantially fool proof construction in which an indicator lamp is energized immediately upon loss of thread tension.

A further object of this invention is to provide an electrical control circuit for a stop motion device in which the winding of the yarn passing through the stop motion device is not started when thread is inserted into the stop motion device until after an interlocking motor control relay is energized.

A further object of this invention is to provide an electrical stop motion device and indicator -arrangement for yarn stretching devices in which the indicator is energized immediately upon loss of thread tension and remains energized until thread tension is restored or until the electric current supply is disconnected.

Other and further objects of this invention will be apparent to those skilled in the art to which it relates from the following specification and claims and from the drawing.

In accordance with this invention there is provided an electrical stop motion device for the electric motor employed for driving the yarn stretching apparatus when the yarn is broken or when it has suffered an abnormal decrease in tension. For this purpose this stop motion device is provided with a pair of members having interpolated portions between which the thread is passed. One of these members is pivotally mounted so as to be rotatable with respect to the other member whereby said interpolated portions are movable with respect to each other. As long as the thread is under sufficient tension this rotation is limited.

- operator is removing a full bobbin from this ring twister,l

are

ICC

A single pole double throw type of micro switch is mounted adjacent to the other end of this pivoted member and a resilient element is positioned between this latter end and said micro switch. This resilient element is arranged to apply spring pressure against said pivoted member tending to rotate this member against the tension of the thread.

As long as the thread is under suiiicient tension so as to prevent this rotation, the resilient element applies suiiicient pressure to the micro switch to keep this switch connected so that the relay which controls the circuit to the electric motor, is energized. However, should the thread tension be reduced for any reason suiciently so that the pivoted member may be rotated by the resilient element, that is associated with the micro switch, then this switch interrupts the circuit to the motor control relay and connects an indicator lamp to a suitable source of current supply.

Once the operation of the yarn stretching apparatus is interrupted then the yarn or thread must be rethreaded through the interpolated members of the stop motion under proper tension before the operation of the yarn stretching apparatus may be resumed. When the yarn is threaded through the stop motion under tension, suitable pressure is applied to the resilient element associated with the micro switch to cause this switch to interrupt the current flow to the indicator lamp and to close the circuit to the micro switch that is connected to the motor control relay. The circuit between the motor control relay and the micro switch is an interlocking circuit which is so arranged that the micro switch cannot in and of itself complete the circuit between the current supply and the winding of the relay, This is accomplished by the momentary closing of the contacts of a push button switch. Once the relay is energized then the interlocking contacts thereof are closed and the relay winding is energized through these contacts and through the contacts of the micro switch that are connected therewith. At the same time the relay also closes the circuit of the motor control contacts thereof so that the motor is energized to drive the yarn stretching apparatus.

Further details of this invention will be apparent to those skilled in the art to which it relates from the following specification, claims and drawing.

Referring to the drawing briey:

Fig. l is a front view of an apparatus incorporating this invention;

Fig. 2 is a sectional View along the line 2-2 of Fig. l;

Fig, 3 is a fragmentary sectional view taken along the line 3-3 of Fig. 1 and showing details of the thread engaging members of the stop motion device;

Fig. 4 is a view along the line 4-4 of Fig. 3;

Fig. 5 is a sectional view along the line 5--5 of Fig. 3;

Figs. 6 and 7 are sectional views of the micro switch showing its two switching positions; and

Fig. 8 is a schematic wiring diagram of this apparatus.

Referring to the drawing in detail, reference numeral 10 designates a cabinet for housing some of the electrical apparatus employed in accordance with this invention. This cabinet 10 is provided with panels 11 and 12. that are attached to the front thereof by suitable screws. Panel 11 supports a push button switch 13, indicator light 14, toggle switch 15 and a guard 16 on the front thereof. Projecting to 'the front of the panel 11 through a hole is the pivoted wire member 13 and a square rod 20 that supports the wire member 17 from the front thereof.

The guard 16 is firmly attached below the

wire members

17 and 18 to protect these members against sudden upthrust of the bobbin from the ring twister 19 when the One of these members 17 is rigidly supported by the member 20 that is attached to the plate 21 behind the panel 11. The member 18 is provided with pivots 22 and 22a that are engaged by adjustable pivot receiving members 23 and 24, respectively las shown in Fig. 3. These pivot receiving members 23 and 24 are threaded into the

members

25 and 20 respectively, so that the member 18 is pivotally supported therebetween.

Members

18 and 20 protrude through the hole 26 in the panel 11 to the front of this panel as shown in Figs. 3 and 4. The corresponding free end portions of the

members

17 and 18 are bent into angular configurations, portions of which are interpolated. These portions include the loop section 18a of the member 18 and the hook section 17a of the member 17, the latter hook portion being substantially encircled by the loop section 18a.

The member 18 is provided with an extension 18b that extends beyond the pivots of this member and engages the resilient blade 27 that is pivotally mounted on the housing of the switch 28 by the pin 29. The switch 28 is attached to the rear surface of the plate 21 which also supports the members 2t) and 25.

The switch 28 is shown in detail in the sectional views Figs. 6 and 7 and comprises a housing 30 made in two parts out of insulating material such as Bakelite or similar material. These housing parts are held together by means of the screw 31. A switch blade 32 of resilient material is supported at its bifurcated end by the screws 33 which also contact the terminals 30a. This blade is provided with a tongue 34 that is engaged by the operating button 35. The button 3S is provided with a shaft portion that extends through a hole in the wall of the housing and engages the blade 27. The other end of the switch blade 32 is provided with an electrical contact 36, the faces of which are aligned with the adjacent electrical contacts 37 and 3S. These contacts 37 and 38 are supported by suitable metallic strips which are connected to the

terminals

39 and 46 that extend to the outside of the housing as shown in Fig. 2.

When thread under normal tension passes between the hook portion 17a of the member 17 and the loop portion 18a of the member 18, the extension 18]: of this latter member engages the blade 27 of the switch 28 and applies pressure to the operating button 35. This button in turn presses the tongue 34 of the switch against the projection 30a so that the blade 32 of the switch is flexed upward and the top face of the contact 36 is caused to engage the contact 37 that is connected to the switch terminal 39. lf the thread passing through the hook 17a should suffer loss of tension, pressure applied to the extension 18b by the blade 27 rotates the member 18 clockwise as indicated by the arrow 18C shown in Fig. 4, until the par-t 18d of the member 18 engages the tl-shaped part 17b of member 17 and as a result pressure is released from operating button 35. The tongue 34 of the switch 28 is then allowed to return to its upper position and the blade 32 resumes its normal position in which the lower face of the contact 36 engages the contact 38 which is connected to the switch terminal 4i).

The switch 28 is connected into the electrical circuit that is illustrated schematically in Fig. 8. The terminals 41 of the switch 2S are connected together inside of the switch and these terminals are connected to one side of the 1l5volt current supply and to one side of the push button switch 13. The other side of the push button switch 13 is connected to one terminal of the winding of the relay 42 and to one of the contacts 42a of this relay. The other terminal of the relay winding is connected to one side of the toggle switch and the indicator lamp 14. The other side of the toggle switch 15 is connected to the llSwolt current supply through a suitable fuse. The upper terminal of the indicator lamp 14 is connected to the terminal 40 of the switch 28 and the terminal 39 of this switch is connected to the upper terminal of the contacts 42a of the relay.

The relay 42 is also provided with three additional pairs of contacts 42h, 42e and 42d which are connected between the 440-volt power supply and the electric motor 43 that is employed to drive the yarn stretching apparatus of the type disclosed in application for patent for Yarn Stretching Device, Serial No. 473,781 tiled by Ralph H. Carter on December 8, 1954, now Patent No. 2,735,160, and assigned to the assignee of the present application.

The relay 42 is also mounted on the rear of the panel 11 as shown in Fig. 2. This relay is of conventional construction and is provided with an armature 45 that is connected by a suitable member which extends through the relay winding upward to the contact supporting member 46 that is of insulating material. This insulating member 46 supports the four movable contactors of the relay 42 and one of these movable contactors 47 is shown in Fig. 2. Each movable contactor 47 has associated therewith a pair of stationary contacts 48 and 49 that are connected to the terminals 50 and 51, respectively. These four contactors and contact sets are shown schematically in Fig. 8 as contact sets 42a, 42h, 42e and 42d.

The relay contact set 42a functions as interlock contacts to hold the relay winding energized when thread under proper tension passes between the

members

17 and 18 as shown in Fig. 2, after the relay winding is initially energized through the push button switch 13 and through the closed toggle switch 15. This toggle switch 15 remains closed during the operation of the apparatus although the push button switch 13 opens upon being released by the operator. However, once the relay 42 is energized through the closed push button switch 13, the relay closes the four contact sets associated therewith and thereafter current to the relay Winding is supplied through the closed contact set 42a and through the switch 2S in which the contacts 36 and 37 are closed as long as yarn under proper .tension is passing through the device. lf the yarn should lose its tension then the switch 28 operates to interrupt the circuit between the contacts 36 and 37 and establish the circuit between the contacts 36 and 38. Since the contact 3S is connected to the termial 40, this operation functions to connect the indicator lamp 14 to the source of current supply and also to interrupt the circuit to the winding of the relay 42. Since the relay is deenergized the four contact sets thereof operate to interrupt the circuits connected thereto and the power to the motor 43 is interrupted so that the yarn `stretching apparatus driven by this motor is stopped. The operation may be resumed by closing the circuit of the push button 13, assuming that the toggle switch 15 is closed. In this way the relay 42 is energized and the circuits of the contactors thereof closed. However, the relay 42 will not remain energized after the push button 13 is released unless yarn under the proper tension is threaded through the hook 17a to apply the proper tension to the member 18 so that the extension 18b thereof presses the blade 27 against the operating button 35 of the switch 28 and closes the circuit of this switch to the terminal 39 thereof as previously described, so that this switch in cooperation with the contact set 42a of the relay 42 completes the circuit to the winding of this relay to maintain it energized.

This invention has been described wtih reference to preferred embodiment thereof, however, it is not desired to limit the invention to the exact details of this embodiment except in `so far as those details are defined by the claims.

I claim:

1. Stop motion apparatus for a yarn stretching device comprising a pair of yarn engaging members, pivot means for pivotally supporting one of said members, means for xedly Supporting said other member, one of said members being bent at its free end to provide a thread receiving portion, the free end of the other said member being bent about the bent thread receiving portion of the rst said member whereby the corresponding free end portions of said members are interpolated, the thread being adapted to pass between said interpolated portions to limit the rotation of said pivoted member on said pivot as long as the thread is under tension, a single pole double throw electric switch positioned adjacent to the other free end of said pivoted member, an indicator connected to one side of said switch and a relay connected to the other side of said switch, a resilient actuating member for actuating said electric switch to complete the electric circuit to said relay while said thread is under the desired tension, said resilient member being positioned between said electric switch and the said other free end of said pivoted member for engaging said last mentioned free end and for applying pressure thereto tending to rotate said pivoted member and separate the interpolated portion of said pair of members when the tension of said thread is reduced whereby the circuit to said relay is interrupted and the circuit to said indicator is completed.

2. Stop motion apparatus for a yarn stretching device as set forth in claim 1 further characterized in that one of said interpolated free end portions comprises a hook shaped member for receiving the thread and the other of said interpolated free end portions comprises a loop member for substantially encircling said hook shaped member.

3. Stop motion apparatus for a yarn stretching device as set forth in claim l further characterized in that the thread under the desired tension prevents said pivotally supported member from rotation and means on one of said pair of members for limiting the rotation of the pivoted one of said members when the thread tension is substantially reduced.

4. Stop motion apparatus for a yarn stretching device as set forth in claim 1 further characterized in that said electric switch is provided with resilient means normally urging said switch to close the circuit to said indicator, said resilient means being pressure biased by said resilient actuating member and said pivotally supported member to cause said resilient means to close the circuit to said relay as long as pressure is applied to said pivotally supported member by the tension of the thread.

5. Stop motion apparatus for a yarn stretching device as set forth in claim 1 further comprising a momentary contact switch for connecting said relay to a source of current supply and a set of contacts connected between said relay and said single pole double throw switch, said set of contacts being arranged to be closed when said relay is energized through said momentary contact switch so that said relay continues to be energized through said set of contacts after said momentary contact switch is released.

6. Stop motion apparatus for a motor-driven yarn stretching device as set forth in claim 1 further comprising contact sets for said relay connected between the motor driving the yarn stretching device and the source of current supply thereto for interrupting the current supplied to said motor when the tension of said thread is substantially reduced.

7. Stop motion apparatus for a yarn stretching device as set forth in claim 1 further comprising a master control switch connected between said relay and the source of current supply therefor, a momentary contact switch connected to initiate operation of the stop motion apparatus after thread under the desired tension is inserted between said interpolated members and a contact set controlled by said relay for maintaining the circuit of said relay closed after said initiating operation as long as thread under the desired tension passes between said interpolated members'.

8. Stop motion apparatus for a yarn stretching device as set forth in claim 1 further characterized in that said resilient actuating member, positioned between said electric switch and the said other free end of said pivoted member, is pivotally mounted to engage said last mentioned free end and to apply pressure thereto tending to rotate said pivoted member and separate the interpolated portions of said pair of members when the tension of said thread is reduced whereby the circuit to said relay is interrupted and the circuit to said indicator is completed.

References Cited in the iile of this patent UNITED STATES PATENTS 1,072,509 Sampson Sept. 9, 1913 1,778,097 Wachsman Oct. 14, 1930 2,657,451 Solliday et al Nov. 3, 1953 2,735,160 Carter Feb. 21, 1956 2,785,559 Davis et al. Mar. 19, 1957