US2155431A

US2155431A - Web roll control mechanism for printing machines

Info

Publication number: US2155431A
Application number: US56883A
Authority: US
Inventors: William C Wieking
Original assignee: R Hoe and Co Inc
Current assignee: R Hoe and Co Inc
Priority date: 1935-12-31
Filing date: 1935-12-31
Publication date: 1939-04-25
Anticipated expiration: 1956-04-25

Description

April 25, 1939. w. c. WIEK ING 2,155,431

WEB ROLL CONTROL MECHANISM FOR PRINTING MACHINES Filed Dc. 31, 1935 5 Sheets-Sheet l 3a as 34 5 April 1939- 1 w. c. WIEKING 2,155,431

WEB ROLL CONTROL' MECHANISM FOR PRINTING MACHINES Filed Dec. 31, 1955 5 Sheets-Sheet 2 April 25, 1939. w. c. WIEKING WEB ROLL CONTROL MECHANISM-FOR PRINTING MACHINES 5 Shets-Sheet 5 Filed Dec. 31, 1935 WEB ROLL CONTROL MECHANISM FOR PRINTING MACHINES Filed Dec. 31, 1955 5 Sheets-Sheet 4;

April 1939- I wfc. WIEKJNG 2,155,431

WEB ROLL CONTROL MECHANISM FOR PRINTING MACHINES Filed Dec. 51, 1955 5 Sheets-Shet'S Patented Apr. 25, 1939 PATENT OFFICE WEB ROLL CONTROL-MECHANISM ron rm'rmo moms William C. Wieking, New York, N. Y., assignor to It. Hoe & 00., Inc., New York, N. Y., a'corporation of New York Application December 31, 1935 Serial No. 56,883

28 Claims.

This invention relates to web supply mechanisms for machines such as printing machines adapted for printing newspapers and/or like products that operate upon webs. More especially this invention relates to improvementsin web supply mechanisms for use with high speed printing or like machines whereby the continuity of the machine operation and its normal operating speed will not be interfered with when and expiring web roll is replaced by another web roll. The invention also contemplates the inclusion in web supply mechanism of safety-and semi-automatic operating featurestwhereby possible dangerous conditions wil be obviated andthe 'operation thereof will be simplified.

Among the various objects 'of this invention is the provision of an improved web tension control device having as its principal feature, a positive automatic tension adjusting control wherebythe web-will be maintained at substantially constant and uniform tension during the entire period of machine operation.

Another object is to provide a device for limiting the movements of the web tension device to prevent possible damage to the material on the replacement web roll, while insuring positive and uniform operation thereof.

Still another object is to provide in a printing or like machine, facilities for improved and more efficient operation of the web tensioning device thereof, whereby its operation will be automatically associated, or interlocked, with the operation of the other devices and mechanisms of the machine, to insure eflicient and reasonably safe operation thereof.

A further object is to provide in a web supply mechanism, having in itsstructure a web tensioning device, a web joining device and a web join timing device, and electrically operated controls, whereby the operations of the various devices will be closely associated and interlocked to insure a maximum of safety and efllciency in the operation of the entire mechanism,

It is also an object of this invention to provide a web supply mechanism of generally improved construction, whereby the device will be simple, durable and inexpensive in construction, as well as convenient, practical, serviceable and eflicient in its use.

With the foregoing and other objects in view, which will appear asthe description proceeds, the invention resides in the combination and arrangement of parts, and in the details of construction hereinafter described and claimed.

The preferred embodiment of the invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a side view of a web supply mechanism for a printing or like machine and embody-. ing the features of this invention; I

Figures 2 and 2A comprise a front view-of the web supply mechanism shown in Figure 1;

Figures 3 and 4 are enlarged views of a part of the web joining device of the web supply mechanism showing the parts in different positions of operation;

Figures 5 and 6 illustrate a form of timing device for controlling the operation of the web joining device shown in the above figures;

Figure 7 is a partialsectionmn line '|l of Figure 2 showing parts of the web tension ing deing of a side view of the web supply mechanism.

The web supply mechanism illustrated in the above noted drawings includes a web roll supporting device or reel II,. which is adapted to be rotated to position the web rolls supported thereby into desired positions by an electric motor l2, and to be moved axially to adjust and align the web margins by an electric motor l3. A web roll rotating means forming part of the web ten- .sioning device of this invention includes a roll contacting belt M, which is movable toward and away from the roll by a swingable arm IS, an

electric motor l6 being provided for this purpose. Coiled springs l1 (Figures 2 and 2A) are arranged to counteract the weight of the arms IS, the motor l6 being actuated to vary the engagement of the belt M with the web roll. The motor I6 is of a type wherein a speed reducing means is directly associated therewith, and which is provided with an electrically operatedbrake device. A detailed description of the structure and operation of the above mentioned devices will be found in an application Serial Number 700,652, filed December 2, 1933.

The above mentioned application also shows and describes a web tensioning device and controls therefor, and a web joining device with its control and timing device, both of which are similar in operation to that shown herein but somewhat difierent in structure. Either form of these devices may have the features of this invention associated therewith witlnequally efllcient resuits, the formsshown herein being of a more improved structure and therefore preferred. The particular form of web joining device shown herein is disclosed and described in detail in an application Serial Number 33,814, filed July 30, 1935, now Patent Number 2,090,296 of August 1937, and the web equalizer device illustrated as having a tiltable roller 23 included in its structure is disclosed and described more in detail in an application Serial Number 25,389, filed June 1, 1935, now Patent 29, 1936.

The reelrotatingmoto'r I2, through suitable reduction gear connections disposedin casing I8, drives a gear I9, which is connected to the shaft of thereel H. The motor [2, as will be described hereinafter, is suitably controlled in its rotative movements whereby it will dispose web rollssupported thereby in operable position and will be inoperative to rotate the reel during certain periods of the machine operation when other devices are in operation. The motor I3 is suitably connected to the reel shaft through-reduction gear in casing 2| to adjust the reel ll axially to move the web running from a supported roll, either to one side or the other to properly align or space its margin with respect to the matter to be printed thereon. This margin adjusting motor is controlled by suitable electrical devices to be hereinafter described.

The motor l6, through its associated reduction gearing, is adapted, by being drivingly' connected to the belt arm through a bevel pinion 22 and gear segment 23, to swing the belt arm to increase or decrease the wrap oi the belt l4 around the web roll engaged thereby, and thereby increase or decrease the tension on the web being fed therefrom. Suitable controls, including mechanically operated electrical controls are provided,

as will be described hereinafter, for efficiently controllingthe operation of the motor I5 and to cause operation of the same in association with the operation of the other devices, .whereby a replacement web roll can be substituted for an expiring web roll in an expeditious and eflicient manner. The belt l4 carried by the arm I5 is driven somewhat slower than, but substantiallyin synchronism with the peripheral speed of the cylinders of the printing machine by a driven shaft 2' which is drivingly connected to a pulley 25, over which the belt 14 is reeved, by

bevel gears

25 and 21.

The above mentioned controls for the motor l6 include, a pair of electrical switches 28 and 29 disposed in a casting 3| and adapted to be respectively operated by switch operating members 32 and 33 (Figure l). The members 32 and 33 are adjustably mounted on a reciprocable operating rod 34, connected by a link 35 to a lever arm 35. The arm 35 is secured to and swingable with, an arm 31, upon the end of which a ,roller 33 is mounted. The roller 38 is disposed in a loop of the running web 39 and is supported thereby to swing the arm 31 when variations in the'tension of the web 39 cause the loop thereof, to lengthen or shorten; the tension of the spring 4|. being set to provide the desired normal operating tension on the web 39 by actuation of nuts 44, which are subsequently tightened to prevent unauthorized or accidental tension changes during machine operation. Variations in web tension are compensated for by movement of the arm 31 ,which, through the instrumentality of the arm 35, the link 35 and the operating rod 34 will cause the proper switch 28 or 29 to be closed Number 2,066,307 of December to actuate the motor It in the proper direction to either raise or lower the arm l5, and therefore either increase or decrease the wrap, and consequent action of the belt I 4, upon the running web roll.

During normal machine operation the running web is pulled through the machine at a surface speed substantially equal to the peripheral speed of the printing cylinder, the belt I4 acting upon the web roll to slightly retard its rotation where by a slight tension is imposed upon the web. The web tension is apt to vary slightly, due to various conditions, such as, stretching of the'web and differences in web texture. Another of these conditions is due to the reduction in the diameter 01' the roll, as the web is removed therefrom, whereby the wrap of the belt l4 thereon is decreased causing a decrease in web tension. As the roll reduces in diameter and the web tension decreases, the web loop in which the roller 33 is disposed lengthens, causing the arm 31 to swing, whereby the rod 34 is moved. Continued movement of the rod 34 in this direction eventually causes it to actuate the more tension switch 29 whereupon the motor l6 immediately operates to lower the arm I5 and cause increase wrap of the belt l4 about the web roll.

To prevent the arm from being swung toogreat a degree whenever either of the switches 28 or 29 is operated, whereby a hunting action may be set up, this invention provides a regulating device shown diagrammatically in Figure 9, whereby the energization of the motor I5 is by timed impulses, rather than by a continuously closed circuit. A motor driven cam controlled switch 45 is herein provided for this purpose and is connected into the electrical circuit of the switches 28 and 29 as will be hereinafter described. Due to the necessity for quickly stopping the machine in emergencies, the belt arm l5 must be quickly moved downwardly toward the web roll by operation, of the motor I 6 and may cause possible damage to the roll or breakage of the web. To prevent th arm l5 from swinging downwardly too far during such an operation, a movement limit switch is provided to open the circuit andstop the operation of the motor I 6 as will be hereinafter described.

The device for joining the web of a replacement roll with the web of an expiring web roll herein consists in a pair of arms 46 and 41 pivotally mounted to a support 48 and being detachably connected together by a catch 49 releasable by an electrically operable solenoid 5|. An arm which is pivotally connected to the arm 45, carries web severing means generally comprising a knife operably supported in a holder 52, and the arm 41 carries a web deflectin brush 53 which, when the arm 41 is released from the arm 46, may be moved, to press the running web from the expiring web roll onto the replacement roll to join the webs thereof, by means of an arm 54, which is connected to the brush arm 41 by a cable or chain 55. Provision is made by this invention toprevent operation of the reel the web tensioning motor [6 when the arms 46 'and 41 are in web Joining position, and during their operation to join the webs, to prevent possible damage should the reel be inadvertently rotated during such operations. The means for preventing operation of the above reel and web tension motors comprises

switches

56 and 51 respectively (Figures 1 and 9), operable by movements or the arms 41 and into operable posirotating motor 42 and to prevent operation of tion, which switches are connected into the respective motor control circuits as will be described hereinafter. a

The operation of the web joining. mechanism is under the control of a timing cam (Figure 5) mounted to rotate with the replacement web roll and operable through a system of levers and links 59 to actuate a switch 6| mounted upon a reel supporting bracket 62. The switch 6| is closed by the cam 58, when an adhesive covered area on the web of the replacement roll is in proper position relative to the web deflecting brush 53 (Figure 3), to permit actuation of the solenoid 5| by a switch 63 (Figures 1 and 2), operated by a trip handle 68 during'the movement of the arm 54 to press the brush 53 to deflect the web of the expiring web roll against the replacement roll. The switch 63 is so arranged that in conjunction with switch 6|, it acts to energize a relay which in turn energizes the solenoid 5| to release the catch 49, (Figure 3) the circuit of which arrangement will be described hereinafter.

Provision is also included to manually adjust the operating members 32 and 33 to vary the actuation of the switches 28 and 29 thereby.- The operating rod 34, upon which the members 32 and 33 are threadedly mounted, extends into a sleeve 64 having a bevel gear 65 secured thereto which is in mesh with a bevel gear 66, secured to which is a handle 61. The connection between the rod 34 and the sleeve 64 is such as to permit sliding movement of the rod 34 axially with respect to the sleeve '64 while insuring rotation of the rod with the sleeve. It is obvious that the manually rotatable handle 61 may be replaced by an electric motor having reduction gearing associated therewith to permit a remote control of the members 32 and 33 if such is desired.

Provision is included whereby tension may be applied to the running web when the web roll is moved, by rotation of the reel II, out of engagement with the belt I4 in preparation for making upon a rod I3. The rod 13 is threadedly secured to an adjusting handle 14 having an abutment I5 thereon. A spring I6 is disposed between the abutment I5 and the block I2 to urge the block away from the abutment and gi'ipp ly bind the band 69 to the brake drum 68, the abutment I5 being supported by a bracket 11 secured to the reel arm. A manually swingable cam member I8 is pivoted upon the stud II and is operable to cam the block 12 along the .rod I3 to release the band from the brake drum. A handle I9 is provided to swing the cam member 18.

With particular reference to Figure 9, the normal operation of the web tension device when the machine is in operation, is controlled by the tension on the running web operating through the switches 28 and 29 by means of the swingable arm 36. I tension will be imposed upon the running web 39 by the belt I4, by action of the motor I6 under control of the switches 28 and 29, and the cam operated impulse switch 45. During the normal operation of the machine, the web joining arms 46, 46' and 41 are folded back and the arm 54 is in a raised position, as indicated in dotted lines in Figure 1: 1

Assuming that the machine is in operation,

Substantially constant and uniform' coil 8|, which is in the main motor circuitof the I now not in operation and therefore the coil 84 is not energized and switch 85 is open. The emergency or red button stop, provided to stop the.

machine when an emergency arises, is also open, whereby the coil 86 is not energized, and a switch 8'! controlled thereby, is open, while a switch 88 is closed. The operating arm 54 and the arms 46, 46' and 41 are in raised position, as shown in dotted lines in Figure l, and the running web 39 is being taken from the roll being engaged and controlled by the belt I4 as indicated by dash lines in Figure 1. The motor 89, driving the impulse relay 45 is running, whereby, through operation of cam 9|, the switch blades 92 are being intermittently engaged and disengaged. The motor 89 is controlled by a switch 93 which through conductor 94 leading from a line wire LL2, connects it to a line wire LLI through a conductor 95.

Intermittently closing of the switch blades 92 of the switch 45, one of which is connected to the line wire LLI by conductor 95, completes a circuit through a conductor 96 to the closed switch 82 and through a conductor 91 to a closed snap switch 98. From the switch 98, the circuit con.- tinues through a conductor 99 to one lead of the less tension limit switch 28, the other lead of which, through a conductor I8 I, is connected with a normally closed push button switch I82. From a the switch I82, through a conductor I83, the circuit continues through a coil control switch I84 and a conductor I85 to a less tension. control coil I86 in the tension motor (I6) control box I81. Y

From the coil I86 thev circuit continues through a conductor I88 to a coil controlled closed switch I89 and then through a conductor II8 into 'thev reel motor (I2) control box III, where, through normally closed forward rotative controls (not shown) but which are operable by energization through a coil II2, the coil I86 is connected with the line wire LL2. The less tension coil I86 is adapted to actuate suitable controls in box IN to cause the motor I6 to operate to raise the arm I5 when the switch 28 is closed by the member 32, by movement imposed thereon by the raising of the arm 31 due to shortening. of the web loop in which the roller 38, on the arm 31, is disposed.

The "less tension coil I86 may also be energized to raise the arm I5 by the closing of the normally open push button switch "I, one contact of which is connected to the line LLI through a conductor I 32. From the other contact of the switch "I the circuit continues through the conductor I83, the coil control switch I84, the conductor I85, the coil I86, the conductor I88, the normally closed switch I89, the conductor III), and thence through the control box III to the line LL2 as above described.

The closing of the switch 45 also completes a circuit from line wire LLI through the conductor 95 through the contacts 92 of switch 45 and through the conductor 96 and the closed switch a, conductor I26, to a more tension coil I21,

disposed in the motor control box I01, to actuate suitable controls therein and cause the motor I6 to operate to lower the arm- I when the limit switch 29 is closed, by the member 33 under movement imposed thereon by the lowering of the arm 31, due to elongation of the web loop in which the roller is disposed.

From the coil I21, the circuit continues through a conductor I28 to a coil controlled normally closed switch I29 and then through the conductor I08 to the switch I09, whereupon it is connected to the line LL2 as in the case of the less tension circuit described above. The "more tension coil I21 may also be energized to operate the motor I 6 to lower the arm I5 by the actuation of a push button switch I3I to connect the conductor I23 directly with-the line wire LLI through the conductor I32. The upward movement of the arm I5 is limited bya limit switch I33 disposed to be actuated by the arm I5 when it reaches its predetermined limit of upward movement. The switch I33 is normally closed and is opened by the arm I5 to open the circuit from the line LLI through conductor 95 to a coil I34 through a conductor I35, the other terminal of which is connected to the line wire LL2 by a connection with the conductor 94. Deenergization of the coil I34 opens the above mentioned switches I04 and 1 controlling the tension motor control coils I06 and I21 respectively, thus preventing the automatic operation of the motor I6 until the switch I33 is again closed by the lowering of the arm I5 by actuation oi. the push button switch I3I.

By the provision of the above controls the tension on the running web 39 will be automatically maintained within efficient operating limits and due to the intermittent circuit closing action of the switch 45 the various more and less tension adjustments of the arm I5 will be in, gradual intermittent steps instead of in one complete movement, which due to the momentum and other conditions would tend to cause a so-called hunting action, whereby, the switches 28 and 29 would alternately act in an attempt to equalize the tension to the desired amount. By controlling the action of these switches by the switch 45, the mechanism between the steps of adjustment will come to rest and the momentum etc., of the moving parts will be prevented from interiering with the smooth operation desired.

By being in the circuit with the switch 81 controlled by the emergency operated coil 86, the more tension coil I21 will be energized to apply a braking action to the roll through the lowering of the arm I5 to prevent it from over running when the machine is stopped in an emergency, the switch connecting the conductors II6 with the LLI through a conductor I36. The stopping'of the machine causes denergization of the coil 8I and the consequent opening of

switches

82 and 83 prevents the operation of the more and lesstension switches 28 and 29.

As stated above, the control arm 54 is in raised position, whereby the switch 51 is normally closed, permitting the operation of the motor I2 to rotate the reel II, forwardly, by a push button switch I4'l or, reversely, by a push button switch I 42. The switch -I4I, when actuated, closes the circuit constituted by a conductor I43 from the line wire LL2, a conductor I44 leading to a switch I45 and from there, through a conductor I46 to the, forward movement control coil II2 in the reel motor control box III. From the coil II2 the circuit continues through aconductor I41 through the switch 51, through a conductor I48, to the switch 88 controlled by coil 86. I The switch 88 is connected to the line LLI through the conductor I36.

The reverse movement push button switch I42, when actuated, connects a reverse control coil I49 in box III, through a conductor I5I with the line wire LL2 by the use of the conductor I43. From the coil I49 the circuit traverses the same path as does the forward control circuit leaving the box by a conductor I". By passing through the switch 51, which is normally closed when the arm 54 is in inoperative position, the respective reel motor circuits above described are under its control, thus insuring that when the arm 54 is lowered in preparation of making a web join and the switch 51 is thereby opened, due to-the engagement of a suitable projection on the arm, no

rotation of the reel ispermitted. This interlocking feature prevents possible damage to the roll or the breaking of possibly interfering parts.

Preparatory to joining the running web 39 to the web of a replacement web roll, the belt arm I5 is raised and the reel II rotated, to position the replacement roll into web joining position.

These operations are accomplished, substantially automatically, by the closing of a push button switch I84. The closing of the switch I84 energizes swich controlling coils I55 and I6I. One contact of the switch I84 is connected by a conductor I5'I to line wire LL2, the other contact being connected by a conductor I85 through a conductor I59 to the coil I6I. From the coil I6l, the circuit continues through a conductor I62 and a switch I63, controlled by the coil I34 to I the line wire LLI.

Conductor I59, which is in connection with the line LL2 as described above, also leads to the coil I55, from which, a conductor I54 leads to a normally closed switch. l52. From the switch I52.

the circuit continues through conductor I53 and conductor I41, to the normally closed switch 51, from which a conductor I 48 leads to the closed switch 88 which is connected to the line LLI by the conductor I36.

Energization of the coil IIiI will close the switch II3 whereby the arm I5 will be raised by motor I6 and open switch I whereby the reel motor I2 is prevented from-operating. One contact of the switch H3 is connected to the line LLI by the conductor I I4 and the other contact thereof is connected by a conductor I03 to a switch I04, controlled by the coil I34. From the switch I04 the circuit continues through conductor I 05 to the coil I06, from which a conductor I08 con' nects with a switch I09 which is connected to line LL2 by a conductor IIO through box III.

Energization of coil I06 actuates motor I6 to raise the arm I5 to the limit of its upward movement whereupon the switch I33 is opened deenergizing the coil I34. Deenergization of the coil I34 will open the switches I04 and I63 whereby the motor I6 and upward movement of the arm I5 will be stopped, and the reel motor I2 started to rotate the reel II to dispose the replacement web -roll into web joining position. The deenergization of the coil I34will open a switch I64 whereby a circuit from wardly. upon the arm 54 and actuating the trip line LLI to the switch m and leading therefrom through a conductor I65 into the control box 202 and the conductor I82 to the release coil of the motor brake will be opened whereby the brake will act to hold the motor I6 against rotation and thereby the arm I5 in its up position. The motor I2 is started when the switch I63 is opened, due to the deenergization of the coil I6I whereby the switch I45 is closed to complete a circuit through the forward rotating coil II2, which circuit includes conductor I51 from line LL2 to the closed switch I58 and .to the closed switch I56, the switch I56 having been closed by energization of the coil I55 when switch I84 is actuated. From the switch I56, the circuit continues through conductor I59, closed switch I4I, conductor I44, switch I45, conductor I46, to the coil II2, from which a conductor I41 leads to the closed switch 51, from which the conductor I48, switch 83, and conductor I36 lead to the line LLI. When the reel II has rotated sufliciently to dispose the replacement roll in proper position, the limit switch I52 is opened, whereby the switch I56 opens due to the deenergization of the coil I55, controlled by the switch I52, and the motor I2 stops. The web rolls are now in the position shown in Figure 1, the web 39 is running from the expiring web roll and the replacement web roll is in position to have. the web 39 secured to the web thereof. j

The next operation is, to lower'the arms 46, 46' and 41 into pre-web joining position as shown in full lines in Figure 1, from the folded dotted position, and to press the holder 52 against the web 39 to dispose it into pre-joining position in respect to the replacement roll, by swinging" downwardly the arms 54 into the position as shown in full lines in Figure 1 from its upwardly disposed dotted position. The swinging of the arm 54 downwardly opens the switch 51, as above described, preventing operation of the reel ro-' and the conductor 94, the other terminal of which is connected to the switch 56, which, by a conductor I16 and the conductor H4, is connected to the line LLI. The switch 56 is closed by the engagement of a'stud I14 on the brush arm 41, with the switch actuating lever system I15, which is arranged to holdthe switch 56 closed until the brush arm is further moved by the arm 54 to make the web join, After a web Join is made, the stud I14 passes by the lever system I15 without closing the switch 56 due'to a swinging lever included in the lever system.

Energization of the coil I11 opens the normally closed switch I99 whereby the automatic tension circuits above described are opened preventing operation of the web tensionmechanism and closes a switch I19 whereby the release coil in the brake oi the motor I6is energized to release the brake and permit the arm I5 tocome down from its up position and engage the replacement roll to rotate and accelerate it to substantially the speed of the running web 39. Closing of the switch I18 connects the line LLI through conductor I8I and conductor I82 with the motor brake'which is connected to the line LL2 by a conductor I83.

The web join is now made by pressing downhandle 69 thereon, to close the switch 63'. The closing of the switch 63, as above described, causes the release of the arm 41 from the arm 46 whereby the brush 53 presses the running web against the replacement roll. This operation is timed by the cam 58, which through the lever mechanism 59, on each reel arm,,actuates the normally open switch 6.I on the reel support, to close the circuit from the line LL2, through a conductor I66, to a conductor I61, leading from the switch 6| to the switch 63. From the switch 63 the circuit continues through a conductor I68, to .one terminal of a coil I69, the other terminal of which is connected to the line LLI through a conductor I12 and the conductor I32. The coil I69, when energized, closes a normally open switch I13 to energize the solenoid 51 and releases the arm 41 from the arm 46 and permits it to swing toward the replacement roll.

When the arm 41 is moved toward the roll after its release from the arm 46 the switch 56 and I42, if desired.

The axial movement of the reel by the margin motor I3-is controlled by limit switches I9I and I92, which are actuated by members on the reel to stop the operation of the motor when the determined movement of the reel is reached. Push button switches are provided for operating the motor I3. For instance, push button switch I93 when closed connects the line LL2, through the conductors I43, and I81, with the limit switch I9I by a conductor I95, from the switch I9I, through a conductor I96. The circuit continues to a motor direction control coil I81 in a control box I98 and then to line LLI. Likewise, switch I94 from the conductor I 81, leads to switch I92, from which aconductor I99 leads to the other motor rotation direction coil 29I and thence to line LLI.

Provision is made whereby when the machine is stopped by actuation of a remotely disposed switch (not shown), which closes a circuit to' energize the emergency stop coil 86, the switch 31 is closed and the motor I6 is operated to lower the arm I5 and thereby cause the belt I4 to apply a braking action upon the web roll to prevent over running of its web. The amount of such arm movement is limited by the limit switch I24 and this movement, in this instance, is not under the control of the cam controlled switch 45. The

switch 81 closes a circuit from the line LLI through the" conductor I36 to the conductor II 6 causes immediate stopping oi the roll rotation.

whenever the machine is stopped in an emergency,

the limit switch I24 opening when the arm II has reached its predetermined down limit to stop the .motor It by opening the above circuit.

All of the motor control boxes I01, I H, and I" are'connected withpower lines Ll L2, and L3 and the motors l2, l3 and [6 are connected by suitable conductors to the controls in the respective box. Suitable controls (not shown) are provided in control box I01 whereby whenever coils I08 and I2! are energized to operate the motor [6 .same.

Other features are, the push button and up limit switch combination including, the switches Ill and-I33 whereby the belt arm I! may be raised to fac i tate threading of the web into the machine, an held there, should an emergency I stop occur while such an operation is being perand the termed; a push button and down limit switch combination including the switche'slil and I24 for bringing the belt arm I! down when desired; provision of controls whereby when the arm I5 is in up-saie position, rotation of the reel II is possible without the arm I! being permitted to tscelnd except by actuation oi the push button swi h 3 1 The provision of means to automatically raise the belt arm I! to move the belt l4 out of the way when a replacement roll is being disposed in web joining position by the rotation oi the reel ll, prevents strains being imposed upon the web of the roll, while it is being brought into such position whereby possible fracture of, or damage to,

the same might result. Other Ieaturas are, the

provision of the switch 88 whereby the reel connot be rotated when the machine is stopped due to an emergency; and the brush arm interlock including, the switch 56 whereby the reel is inoperative when the brush arm 41 or its controlling arm 54 is swung down into web pre-joined posi- On, It will be understood that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired that the present embodiment be considered in all respects as.

illustrative and not restrictive, and it will be further understood that each and every novel teature and combination present in or possessed by the mechanism herein disclosed forms a part of the invention included in this application.

What I claim is: 1. In a web supply mechanism, a web tensioning device including a movable web roll .engaging member, an electric motor for moving said member, electrical controls for said motor, web engaging means aflected by web tension i'or actuating said controls to cause the motor to move the member to vary the engagement of themember with the roll and thereby compensate for variations in web tension, and an electrical device operable to permit only intermittent operation of said controls. a

'2. In a web supply mechanism, a web tensioning deviceincluding a movable web roll engaging member, an electric motor for moving said member, anelectrical control ior said motor to operate it to increase the engagement oi. the member on the roll to provide more web tension, an electrical control for said motor to operate it to lessen the engagement of the member on the roll to provide less tension, web engaging means aiiected' by the tension of a web running from the roll to actuate said controls, and an electrical device operable to permit only intermittent operation of both controls. I

3. In a. web supply mechanism, a web tension ing device including a movable web roll engaging member, an electric motor for moving said member, an electrical control for said motor'to operate it to increase the engagement of the member on the roll to provide more web tension, an electrical control for said motor to operate'it to lessen the engagement of the member on the roll to provide less tension, web engaging means afiected by web tension for actuating said controls, and an electrical device comprising a constantly operating intermittent circuit closing switch to limit the action of said controls.

4. In a web supply mechanism, a web tensioning device including a movable web roll engaging member, means to move said member, a swingable arm movable by variations in web tension, means actuated by movements 'of said arm to control said member moving means to compensate for web tensionvariations, and means to control the operation 01 said member moving means to cause it to operate in intermittentsteps.

5. In a web supply mechanism, a web roll supporting member, a running belt adapted to engage the roll on said member to rotate the same, a swingable armsupporting said belt, intermittently operable electrical means to move said arm to vary the engagement oi said belt upon the roll, means affected by the tension of the web running from the roll to control said electricalarm moving means, and electrical means controlling said armmoving means to limit the movement of said arm toward the roll on said supporting member.

6. In a web supply mechanism, a web roll supporting member, a running belt adapted to engage the roll on said member to rotate the same, a swingable .arm supporting said belt, intermittently operable electrical means to move said arm to vary the engagement of said belt upon the roll, an electrical control for said arm moving means to raise said belt out of engagement with, the roll on said reel, and an electrical control to limit the amount of such movement.

7. In combination with a machine adapted to operate upon a web, a web roll supporting reel, electrical means to rotate said reel, mechanism movable into operative position for joining the web of a roll supported on said reel with a web running into said machine, electrical means for controlling said web Joining mechanism, a web tensioning device, electrical means for controlling said tensioning device, electrical interlocking means between the controls for said mechanism and said device, to cause said web tensioning device to be inoperative when said web joining mechanism is in operation, and electrical interlocking means, between said reel rotating means and said web joining mechanism control means,

,to cause said reel rotating means to be inoperative when said web joining mechanism is in operative position.

8. In combination with a machine adapted to operate upon a web and to be stopped in an emergency, a web roll supporting reel, an electrical motor to rotate said reel, electrical controls 7 I for said motor, and electrical interlocking means to prevent operation of said reel rotating motor controls, when said machine is stopped in an emergency. Y

9. In combination with a machine adapted to operate upon a web and to be stopped in an emergency, a. web roll supporting reel, an electrical motor to rotate said reel, electrical controls for said motor, web tensiom'ng means including an electrical motor, a swinging arm, adapted to be moved by said motor to apply more tension to a web, electrical controls for said motor, and electrical interlocking means to prevent the operation of said reel rotating motor controls and to cause said arm moving motor controls to operate to apply more tension to the web when said machine is stopped in an emergency.

10. In a web supply mechanism, a web tensioning device including a control member movable into and out of engagement with a rotating web roll, to control the speed of rotation thereof, means controlled by the tension of the web running from the'roll, to vary the effect of said control member, and means to limit the movement of said control member in either direction.

'11. In a web supply mechanism, a web tensioning device including a control member movable into and out of engagement with a rotating web roll, to control the speed of rotation thereof, intermittently operable means controlled by the tension of the web running from the roll, to vary the effect of .said control member, and means to limit the movement of said control member in its movement into engagement with the roll.

12. In a web supply mechanism, a web tensioning device including a control member movable into and out of engagement with a rotatable web roll, to control the speed of rotation thereof, means to move said member out of roll engaging position, a roll support, means to move said roll support to position the supported roll in operative position, and an interlocking control to insure operation of said member moving means before said roll supporting means operates.

13. In a web supply mechanism, a web tensioning device including a control member movable into and out of engagement with a rotatable web roll, to control the speed of rotation thereof, means to move said member out of-roll engaging position, a roll support, means to move said roll support, to position the supported roll in operative position, an interlocking control, to insure operation of said member moving means before said roll supporting means operates, and another control to prevent operationof said member moving means, while said roll supporting means is, operating.

14. In a web supply mechanism, a web tensioning device including a control member movable into and out of engagement with a rotatable web roll, to control the speed of rotation thereof, means to move said member out of roll engaging position, a roll support, means to move said roll support, to position the supported roll in operative positon, an interlocking control to insure the operation of said member moving means before able into and out of engagement with a rotatable web roll, to controlthe speed of rotation thereof, means to move said member out of roll engaging position, a roll support, means to move said roll support, to position the supported roll in operative position, an interlocking control to insure the operation of said member moving means before said roll supporting means operates, means to move said member into engagement with the roll after the same has been positioned by said roll support, and interlocking means to stop and prevent further movement of said roll support when said member is in roll engaged position.

16. In a web supply mechanism, a web tensioning device including a control member movable into and out of engagement with a rotatable web roll, to control the speed of rotation thereof, means to move said member out of roll engaging position, a roll support, means to move said roll support, to position the supported roll in operative position, means to press a running web against the web roll on said support, an interlocking control to insure operation of said member moving means before said roll supporting means operates, means to move said member into engagement with the roll after the same has been positioned by said roll support, and interlocking means to prevent movement of said roll support, while said web pressing means is operated.

17. In a web supply mechanism, a-webtensioning device including a control member movable into and out of engagement with a rotatable web roll, to control the speed of rotation thereof, means to move said member out of roll engaging position, a roll support, means to move said roll support, to position the supported roll in operative position, means to press a running web against the web roll on said support, an interlocking control to insure operation of said member moving means before said roll supporting means operates, means to move said member into engagement with the roll, after the same has been positioned by said roll support, interlocking means to prevent movement of said roll support and said web tensioning device, while said web pressing means is operating, and means to release said interlocking means after operation of said web pressing means, to permit operation.

of said web tensioning device.

18. In a web supply mechanism having means to support a web roll, a web tension controlling device including an electric motor, a web roll engaging member actuated by said motor to vary web tension, a control for said motor, means affected by the tension of the web for actuating said control, and an intermittently actuated switch to control said motor control and permit only intermittent operation of said motor when the control is actuated by said means.

19. In a web supply mechanism, a web roll carrying reel adapted to carry a. replacement roll, electrical'means to rotate said reel to position the replacement roll relatively to a running web, means to support a replacement roll engaging and rotating device and being movable toward and away from the roll, electrical means to move said device support, and electrical interlocking controls between said reel rotating means and said support moving means to actuate the latter and move said device support away from the roll before said reel rotating means is operated.

20. In combination with a machine adapted to operate upon a web, a web roll supporting reel, electrical means to rotate said reel, mechanism movable into operative position for joining the webs of a roll supported on said reelwith a web running into said machine, electrical means for controlling said web joining mechanism, a web to control tensioning device movable toward and into engagement with the supported roll, electrical means for controlling said tensioning device, electrical interlocking means between said mechanism and said device controls to cause said web tensioning device to be inoperative when said web joining mechanism is'in operation, and means tov limit the movement of saidweb tensioning means toward the supported roll.

21. In a web supply mechanism, a web tensioning device including a member movable into and out of engagement with a rotatable web roll the speed of rotation thereof, means to actuate said member, means to support the web roll, said roll supporting means b81 8 movable to dispose the roll in operative position, means to move said roll supporting means, means to control the operation of said member actuating means and said roll support moving means, to prevent the operation of one while the other is operating, and means to limit the movement of said member into engagement with the roll.

22. In a web supply mechanism having means to support a rotatable web roll, a web tensioning device including braking means acting on the supported roll, an electric motor for actuatin said braking means, electrical controls for said motor, web tension controlled means for actuating said controls and causing the motor to actuate said braking means to vary its action on the web roll and compensate for variations in web tension, and anintermittently operating switch in circuit with said controls to cause step by step operation of said braking means while it isbeing actuated by said motor.

23. In a web supply mechanism having means to support a rotatable web roll from which a web is running, braking means adapted to act upon a supported roll, electrically operated means to actuate said braking means to vary its braking action on the roll, means adapted to be actuated by changes in tension of the running web to control said electrically operated means, and means in control of said control means to cause intermittent action of said braking means as it is be'- ing actuated by said electrically operated means:

'24. In a web supply mechanism, a web roll supporting member, a brake mechanism having a movable part in engagement with the roll on said member to effect a braking action thereon,

upon the roll, and means aflected by the tension of a web running from the roll to control said 7 intermittently. operable means.

25. In a web supply mechanism, a web tensioning device including a brake mechanism having a movable part in engagement with a rotating web roll to effect a braking action thereon, means to move said part, intermittently operable means controlled by the tension of the web running from the,roll to control'said part moving means to vary the braking eflect of said braking mechanism upon the roll, and means to limit the movement of said braking mechanism part.

26. In a web supply mechanism having means to rotatably support a web roll from which a running web is fed to a machine, a web tension device including a floating roller running in a and arranged to vary the pressure oi the member on the roll when the position of the floating roller is changed, and means in the control circuit of said electrically operated means to cause intermittent operation thereof as it operates, to vary the pressure of the member on the roll by successive steps.

27. In a web supply mechanism, a web tensioning device including a member; adapted to frictionally engage the periphery of a rotating web roll to apply a braking action thereto, means to move said member to increase its frictional engagement with the periphery of the .roll, means controlled by the tension of the web running from the roll to cause operation of said member moving means to move said member to increase its frictional engagement with the roll, and other means to cause the member to move in a series of successive steps.

28. In a web supply mechanism, a web tension-' ing device including a member adapted to frictionally engage the periphery of a rotating web roll to apply a braking action thereto, means to move said member to decreaseitsfrictional engagement with the periphery of them, means controlled by the tension of the web running from the roll to cause operation of said member moving means to move said member to decrease its frictional engagement'with the roll, and other means to cause the member to move in a series of successive steps.

WILLIAM C. WIEKING.