US3250053A

US3250053A - Bottom wrap inserter

Info

Publication number: US3250053A
Application number: US227929A
Authority: US
Inventors: Frank S Hyer; John H Trumble
Original assignee: Cutler Hammer Inc
Current assignee: Cutler Hammer Inc
Priority date: 1962-10-02
Filing date: 1962-10-02
Publication date: 1966-05-10
Anticipated expiration: 1983-05-10

Description

May10,1966 F. `s. HYER ETAL 3,250,053

BOTTOM WRAP INSERTER Filed oct. 2, 1962 7 sheets-sheet `1 whip e "Mull,"

duw" e Hull May l0, 1966 F. s. HYER ETAL BOTTOM WRAP INSERTER '7 Sheets-Sheet 2 Filed Oct. 2, 1962 WNV Filed Oct. 2, 1962 F. S. HYER ETAL.'

BOTTOM WRAP INSERTER A'7 Sheets-Sheet 5 Bef Many l0, 1966 F. s. HYER ETAL BOTTOM WRAP INSERTER '7 Sheets-Sheet 4 Filed Oct. 2, 1962 a Wa May l0, 1966 F. s. HYER ETAL 3,250,053

BOTTOM WRAP INSERTER Filed oct. 2, 1962 v sheets-sheet s fs WSW@ 5%, Wy @y www mfw May 10, 1966 F. s. HYER ETAL 3,250,053

BOTTOM WRAP INSERTER Filed Oct. 2, 1962 7 Sheets-Sheet 6 May l0, 1966 F. s. HYER ETAL BOTTOM WRAP INSERTER 7 Sheets-Sheet 7 Filed OCT.. 2, 1962 l/OV, 60 CVCLE LOAD sToP

" O L STA/2 RUN / SOL r-.lfa sol.

MA/ /F OLD United States Patent This invention relates to bottom sheet wrap inserting machines.

Features of the invention disclosed in the present application are disclosed and claimed in copending application Serial No. 227,898, Frank S. Hyer, inventor, led OctO- i

ber

2, 1962 and -assigned to the assignee of the present application.

While not limited thereto, the machine of the present invention is particularly suited for inserting sheet wraps under stacked articles such as newspapers and the like.

Bottom wrap inserting machines which pay oif a length of web from a roll supply under moving articles and then cut it ofi from the roll to a predetermined length are well known. These have taken various forms, but have commonly employed relatively expensive-to-build web cut-off mechanisms. Prior Iconstructions have also left much to be desired as to ease of initial threading of a web from a new supply roll, and providing easy access to the web drive and cut-olf mechanism for maintenance and clearing of web jams.

It is therefore a primary object of the present invention to provide an improved bottom wrap inserting and cutoff machine of a construction providing ready and easy access to the web drive and `cut-off mechanism and which permits use of a simple type of web cut-off mechanism.

Another object of the invention is to provide an inserting and cut-off machine of the aforementioned type wherein the wrap is inserted under the articles and is positively driven in synchronism with the movement of the articles along a conveyor and appropriately cut oi to provide overlap at both ends of the article.

A further object is to provide a machine of the aforementioned type which provides means whereby the length of the articles automatically determines the point at which the wrap web is severed to provide the desired length of sheet wrap.

A still further object is to feature in the construction for the aforementioned machine limit and interlock switches insuring the safety of the operator.

Still another object is to provide a machine of the aforementioned type which can be driven by an electric drive motor individual thereto, or be driven through mechanical connection by a newspaper stacking machine or the like.

Other objects and advantages of the invention will hereinafter be apparent.

The accompanying drawings illustrate a preferred embodiment which will now be described in detail, in which:

FIGURE 1 is a top plan View of the device;

FIG. 2 is a side elevation of the device with portions of the cover elements broken away;

FIG. 3 is an elevational view of the incoming end of a portion ofthe device;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3; p v

FIG. 5 is a sectional view similar to FIG. 4 showing the operated position of various parts; v

FIG. 6 is an elevational view of a subassembly with portions broken away; Y

FIG. 7 is a sectional View taken along line 7-7 of FIG. 4;

FIGS. 8, 9 and 10 are end views of a portion of the device showing it in three different positions;

Patented May 10, 1966 ice FIG. 11 is an opposite end view of the portion of the device shown in FIGS. 8 to l0, and

FIG. l2 is a partially diagrammatic and partially schematic view of the control system for the device.

A bottom wrap inserter machine constructed in accordance with the invention has ran incoming conveyor 16 mounted on the left end of a framework as seen in FIGS. 1 and 2 and an outgoing conveyor 18 mounted on the opposite end. Also mounted on the frame, between

conveyors

16 and 18, is a cutter drive unit 20. Cutter drive 20 can be removed as a unit by removing bolts 36. These components are driven through a system of sprockets by -ch-ain 22, lrepresented by a broken line in FIG. 2. Chain 24, also represented by a broken line, connects the end rollers of outgoing conveyor 18. Chain 22 is driven by motor 26 mounted within the frame of the device. If it is desired, incoming conveyor 16 may be replaced by the output end of a counter-stacker, such as the one described in Howdle et al. Patent No. 2,819,661, granted January 14, 1958, now Reissue No. 25,018, and'ch-ain 22 connected to be driven by the counter-stacker drive.

A roll of wrapping paper 28 is mounted on a cradle assembly 30 and positioned in an opening of the frame below conveyor 18. This assembly can be positioned to load the roll from either side of the device. The roll is slid over a spindle 30a and then held iirm by threading a hub 30b snugly against it.

A dancer roll assembly 32 is pivotally mounted on the right-hand leg of the frame at 34. This assembly comprises two substantially L-shaped tubes 32a connected at one end.by a roller 32b, and holds the paper under tension during the operation of the device. A plate 32C rigidly secured to one of the tubes 32a cooperates with the actuator of a limit switch LSS mounted on the righthand leg of the fra-me for a purpose that will hereinafter be explained.

As best shown in FIGS. 8-10, the cutter-drive unit comprises three main sections; a base or lower section 38, a power or upper section 40, and a pressure roll transfer section 42. These sections and the means for connecting them make up a feature of the invention that will be later described in detail.

End plates 44 of base section 38 are attached to spacer bars 46 by bolts 48, which also secure angle mounting members 50 to the base. Bearing plates 52 are rigidly secured to the upper ends of end plates 44 by screws 54 which take into threaded openings in L-shaped bracket 56 through clearance holes in end plates 44 (see FIGS. 3, 4 and. 5). Bearing plates 52 and end plates 44 form the housing for the ball bearings that support a main power shaft 58. A sprocket 60 secured to main power shaft 58 provides the cutter-drive unit a driving connection with chain 22 from motor 26.

Also attached to brackets 56 is another pair of brackets 62, which serve as mounting means for curved guide plate 64. Plate 64 is attached to brackets62 by iiat head screws 66. Clearance slots 64a have been provided in plate -64 to accommodate rollers 42e of pressure roll transfer section 42. d

Pressure roll transfer section 42 is rotatably mounted on main power shaft 58 by ball bearings housed in end pieces 42a. End pieces 42a are bolted to each endl of a connecting plate 42h. Shafts 42C and 42d are also mounted freely rotatable on `ball bearings housed within-.end pieces 42a. Rubber idler rollers 42e and 42]c are nonrotatably attached to shafts 42C and 42d, respectively, in spaced apart relation. I

A clevis plate 68 is bolted to connecting plate 42b at approximately its center. A headed clevis pin 68a is inserted through clearance holes in plate 68 and in lever 70 and held in place by a cotter key. The other end of tion on rod 80.

side of plate 90 by means of a hinge assembly 96a.

lever 70 is attached to the plunger of air cylinder AC1 by threading the plunger extension into a tapped hole in horizontal leg 70a of lever 70. Adjustment of the travel of pressure transfer section 42 may be made by these means, and a nut 7 0b, is threaded against the underside of leg portion 70a to lock the adjustment. `Air cylinder AC1 is secured by a clevis plate 72 and a headed clevis pin 72a to mounting plate 74.

A bracket 76 is bolted to connecting plate 42b near its left end (FIGS) for attachment thereto of one end of an actuator rod 78 which is pivotally connected at its other end tothe actuator of a limit switch LS3. Limit switch LS3. is mounted on the left end plate 44 by a pair of screws.

A rod 80 extends between end plates 44 and is secured thereto at each end by bolts 80h. Collars 80a are held in place on rod 80 by set screws, and these collars linearly position a cutter assembly 82. Rod 80 also aids in spacing apart end plates 44, as do spacer bars 46.

Cutter assembly 82 is mounted on rod 80 `by yoke portion 82a which has insert bearings 82h of bronze or the like pressed in each leg, affording the assembly free rota A V-shaped bracket 82C is mounted on yokeportion 82a by bolts 84. The length of this assembly can be adjusted by slots 82d in yoke portion 82a. A cutter blade 82e having a saw-toothed edge, is held in place on bracket 82C by screws 82]c which take into threaded holes in a back-up bar 82g. A bracket leg 82h extends downwardly of yoke portion 82a and is connected to a clevis plate 82j by a headed clevis pin 82k, which is retained by a cotter key. The horizontal member of clevis plate 82j is slotted lengthwise and has a tapped hole at its center. 'Ihe plunger extension of air cylinder ACZ is threaded into this hole until the proper adjustment of cutter assembly 82 is obtained, and then screws 82m are tightened to hold the adjustment. Air cylinder ACZ is secured by clevis plate 86 and clevis pin 86a to mounting plate 74. A bracket 88 is mounted on spacer bars 46 for mounting a limit switch L86. Limit switch Vplate 90 has clearance slots provided to accommodate rollers 42f o f pressure roll transfer section 42.

As can more clearly be seen in FIG. 7, plater 90 also houses the cooperating lower portion of the paper stop mechanism 98. A resilient brake lining material 92, such 'asV rubber or the like, is secured to a backing plate 94 by screws 94a. A support plate 96 is fastened to the under- A screw 96b also is fastened to plate 90 by nut 96C and extends downwardly from plate 90. Backing plate 94 is then placed on the support plate 96 which is swung into position and held in place by wing nut 96d, trapping backing plate 94 between itself and plate 90. Rubber lining 92 and part of backing plate 94 extend through opening 90b in plate 90 to allow contact with the paper stop assembly 98. Replacement of worn brake linings is facilitated in this'manner. Y

As 4can best be seen in FIGS. 4, 5 and 6, upper portion of paper stop mechanism 98 is secured to end plates 44 by bolts 100, which take into threaded holes in mounting frame 98a. Vertical adjustment of such portion of the mechanism'98 is afforded through slots 44a in end plates 44. A U-shaped mem-ber 98h is bolted to frame 98a to support paper stop lever 98C. Nylon bearings 98d are -inserted into holes in the legs of member 98b and screws 98e penetrate through the bearings and thread into stop lever 98C, leaving it free to pivot. Secured by bolts on top of mountingframe 98a is a bracket 981, in which is pivotally mounted an air cylinder AC3. Ay tongued clevis adaptor 98g is threaded onto the plunger extension of air cylinder AC3 and positioned in a slot 98h in paper stop lever 98e. A bolt 98j projects through a rst clearance hole in the tongue of adaptor 98g, and is threaded into a tapped hole in the lever 98C, connecting the air cylinder to the stop lever.

As best shown in FIGS. 2, 3 and 8, power section 40 has its end plates 102 mounted pivotally to the upper end of bearing plates 52 at a pivot point 104. A shaft 106 is nou-rotatablybolted between end plates 102 and helps to maintain their spaced relation. An idler roller 106a is rotatably mounted on shaft 106 and is held against axial movement thereon by collars 106b.

A bearing block 108a for top plate 108 is also pivoted on shaft 106 to lallow the top plate 108 to be pivoted upward from the power `section 40. This will be later explained in more detail. Top plate 108 has a downwardly bent portion 108b at the incoming end of the unit to prevent loose edges of incoming papers from slipping or snagging under the plate. A slot 108e is also provided in plate 108 for the web 28a of wrapping paper to pass through above the plate and under a stack of newspapers. Clearance slots 108d are also provided for the rolls 11601 of power section 40. As best shown in FIGS. 4 and 5, guide

plates

110 and 112 are secured to brackets 114, which in turn are screwed to end plates 102, and along with shaft186, serve to space end plates 102.

Plates

110 and 112 are also provided with clearance slots to accommodate their respective rollers.

A shaft 116 extends through end plates 102 a't both ends of the power section 40, and is mounted in antifriction bearings held by housings secured onV the outside of each end plate 102. Rubber drive wheels 1 16a are non-rotatably secured to shaft 116 in spaced apartvrela tion to cooperate with the rubber idler rollers 42e on shaft 42e. j Power is imparted to shaft 116 through a gear 118 non-rotatably mounted thereon which normally meshes with a gear 120 Xed on main power shaft S8. At its other outer end, shaft 116 has a gear 122 fixed thereon which meshes Iwith an idler gear 124, which in turn meshes with a gear 126 fixed on shaft 128 to drive the latter (FIG. 1l). l

Like shaft 116, a shaft 128 also extends through end plates 102 and is mounted in antifriction bearings within housings bolted on the outside of end plates 102. These housings 138 have special legs 130:1 formed on them for a purpose to be later described. Shaft 128 also has rubber drive rollers 128a non-rotatably mounted in spaced apart relation to cooperate with rubber idler rollers 42f of shaft 42d.

In article-handling systems, the output received as dependent upon a smooth, efiicient operation of all components within the system. The length of time required to restore a breakdown anywhere in the system lowers the output considerably. FIGS. 8-11l in the drawings show a particular feature of the invention which greatly facilitates restoring the cutter-drive unit to working order in a short time should a breakdown or web jam occur therein.

FIGS. 8 and 11 are opposite end views of the cutterdrive unit 20 in its latched and operable condition. Power unit 40 is held to base unit 38 by

levers

132 and 134 which are pivoted at 136 and 138, respectively.

Levers

132 and 134 are biased in counterclockwise and clockwise di rections, respectively, by tension springs 140 and 141. Levers 134 has an extension 134a to which a disk shaped member 13411 is eccentrically mounted to cooperate with the plunger type actuator of a limit switch LS7, mounted on the outside of an end plate 44. Member 134b may be rotated to adjust the tripping point for the limit switch LS7.

On the inside of their upper ends levers 132 and 134 have substantially triangular shaped members 142 mounted by pins and screws as shown. These members cooperate with a surface on the leg portions a of bearings 130 to latch power section 40 to base section 38.

Rollers 144 are

mountedon levers

132 and 134 for cooperation with cams 146 which are rigidly mounted on a common shaft 148. Shaft 148 extends through the base section 38 and is rotatably mounted in openings in the end plates 44. Spacers 148a (FIG. 3) located between the cams 146 and end plates 44 serve to properly position the assembly. Shaft 148 extends to the outside of the Idevice andl operating handles 150 are iixed to each end (FIGS. l and 2).

Should a jam occur in the paper web 28a within the cutter-drive unit, the operator turns handle 150 until the rollers 144 snap over the detent portions 146a of cams 146 (FIG. 9). Detent portions 146a offer feel of position of cams 146 and serve to hold or lock the latch as sembly out of engagement until a positive rotating pressure is applied to handle 150 to overcome the locking action. The action of the cams 146 on the rollers 144 forces the levers132 and 134 outwardly against the bias of springs 140 and triangular members 142 move out of engagement with leg lportions 130a of bearing housings 130. Previous to this in the operation of cams 146 extension 134a of lever 134 moves inwardly, causing member 1341 to trip` safety limit switch LS7 to interrupt electrical power supply to motor 26 and its controls as will4 hereinafter be more fully explained. The operator can then lift top plate 108 from its position on power section 40. Spring loaded balls held in block 108e cooperate with slots on the inner edges of end plates 102 of power section 40 to give a detent type of latch to plate 108.

These steps completed, the operator can then pivot power section 40 upwardly, or counterclockwise as` shown in FIG. 10, around pivot point 104, exposing the inner mechanism of cutter-drive unit 20, and the paper jam. Once the jam is cleared, the procedure is reversed and the device is ready to function again.

The motor 26 of the device is connected to a threephase, 60 cycle, A.C. source of 220 or 440 volts (FIG. 12). The' control components for this motor are connected to the more common 110 volt, A.C. source. The connections and components are made readily accessible by mounting them on a control -panel behind a door 21 in the lower left-hand portion of the frame. A control station 25 is mounted on the device within easy reach of the operator and may be mounted on either side of the v device.

The pneumatic control elements are located in a drawer in the same location as door 21, but on the opposite side of the device. The air supply manifold, which is located in this drawer, is connected to a suitable source of pressure air supply.

FIG. l2 illustrates the `device in its at rest state, air pressure being supplied to the manifold and electrical power supplied to the machine, but without connection to the device through the control components. To start the device, a push-button start switch S1, mounted on the control station 25, is momentarily depressed to cause current flow from A.C. supply line L4 through the start switch S1, a normally closed push-button stop switch S2, limit switch LS7 and a relay coil 4CR to A.C. supply line L5. This energizes relay 4CR which closes its contacts 4CR1 to maintain a circuit around push-button S1 when the latter is released. Current also flows from line L4 through contacts 4CR1, stop switch S2, limit switch LS7, and main contactor M, to line L5, energizing contactor M which closes its contacts M1, M2 and M3. These contacts connect the motor 26 with main power supply lines L1, L2 and L3, causing motor 26 to run and drive

conveyors

16 and 18 and cutter-drive unit 20 through drive chain 22.

A selector switch S3, also located at the control station 25, -is moved to its run position, thus affording a circuit from line L4 through closed contacts 4CR1, stop switch S2, selector switch S3 and relay SCR to line L5. This energizes relay SCR, which closes its normally open contacts 5CR2, to connect line L4 to line L5 through contacts 1 of limit switch LS1, contacts 1 of limit switch LS3 and an air valve solenoid 2 SOL to energize the latter. Energization of solenoid 2 SOL actuates a spring return air valve 2 AV, located on the air supplymanifold, moving it to its right-hand position against the bias of its return spring. In its right-hand position, air valve 2 AV directs air flow to the bottom of air cylinder AC2, forcing the cutter assembly 82 upwardly, to its cutting position. Limit switch LS6, actuated by'the movement of cutter assembly 82, is thereby opened.

As a Astack of newspaper enters incoming conveyor 16, it operates limit switch LS1, closing its contacts 2 and opening its contacts 1 thereby opening` the circuit to air valve solenoid 2 SOL causing cutter assembly 82 to drop to the position shown in FIGS. 4 and l2. Limit switch LS6 consequently recloses and current ows from line L4, through contacts 2 of limit switch LS1, limit switch LS6, and an air valve solenoid 1 SOL to line L5. Solenoid 1 SOL consequently becomes energized and moves its associated spring return air valve to the right- Ihand position against the bias of the return spring, directing air into the top of air cylinder AC1. Thus pressure roll transfer section 42 is rotated counterclockwise to engage rollers 42f with web 28a and force it against rubber drive wheels 128a of the power section 40. A

l manually adjustable air throttling valve 158 is inserted under the oncoming stack of papers at the same speed that the papers are traveling.

When pressure roll transfer section 42 is rotated counterclockwise it actuates limit switch L83, thereby opening contacts 1 and closing contacts 2 of the latter. Closure of contacts 2 of limit switch.LS3 completes an energizing circuit for air valve solenoid 3 SOL which, upon energization, moves spring return air valve 3 AV against the bias of its return spring to its left-hand position, directing air into' the bottom of air cylinder AC3. This releases the paper stop brake lever 98C and allows the web 28a to be driven freely by

engaged rollers

42f and 128a (FIG. 4).

Web 28a will be driven as long as the stack of papers holds limit switch LS1 in its position 2. When the stack passes beyond the actuator of limit switch LS1 the latter returns to its operating position 1. Solenoid 1 SOL then becomes deenergized and drops out, the spring return air valve 1 AV rnoves to its left-hand position, and air flow into the bottom end of cylinder AC1 forces its plunger upwardly, rotating pressure roll transfer section 42 clockwise. Thus, rubber wheels 42e engage web 28a and press it against drive wheels 116a and the latter continue to drive the wrap under the advancing stack of papers, maintaining tension in the web between these rollers and the dancer roller 32h.

The last mentioned movement of pressure roll transfer section 42 also reopens contacts 2 and recloses contacts 1 of limit switch LS3. The then closed contacts 1 of LS3, along with already closed contacts 1 of LS1, cause energization of air valve solenoid 2 SOL, moving air valve 2 AV to the right, directing the air flow into the bottom of air cylinder AC2. Cutter assembly 82 is then forced upwardly through the opening between

guide plates

64, 1110 and 90, 112, severing paper web 28a (FIG. 5). The points o-f the saw teeth of the cutter blade 82e puncture the paper due to the tension imparted by the

rollers

42e and 116a and the dancer roller 32b. The continued upward movement of the cutter assembly and forward movement of the web cause a tearing action to finish the cut.

The opening of contacts 2 of limit switch L83` opens the circuit to air valve solenoid 3 SOL and the latter drops out, allowing air valve 3 AV to be spring returned to its right-hand position and direct air flow into .the top of air cylinder AC3. This causes movement of paper stop lever 98e against web 28a to press it against rubber brake lining material 92, thereby preventing the web 28a from falling out of cutter-drive unit 20. A pressure regulator valve 160 is inserted in the line between air valve 3 AV and the manifold to govern the rate and pressure of air flow to valve AC3.

As web 28a feeds through cutter-drive unit 20, roll 28 is held stationary` by an electromagnetic brake BR, mounted on spindle 30a of cradle assembly 30. The dancer roll assembly 32 pivots around pivot point 34, and roller 32b travels upward with the paper web 28a, placing the web under tension. At a predetermined adjusted limit, the dancer roll assembly 32 closes a limit switch LSS which completes a circuit from line L4, through closed contacts 5CR2, through LSS, and the coil of bra-ke BR to line L5. This circuit energizes the coil of the brake BR thereby withdrawing the brake shoe to release the roll and allow more paper to pay off unde-r the weight of dancer roll assembly 32, until the latter reopens the limit switch LS5.

As can be seen, the device is now ready for another stack of papers, and will continue to function in the above manner upon each subsequent actuation of limit,

switch LS1. Through adjustment of LS1, the amount of lead and tail of the wrap can be altered, while the length of the stack determines the length of the wrap. The further upstream on the conveyor the limit switch is placed, the sooner the device will start and therefore the more leading edge will be had. The amount of tail is varied by increasing or decreasing the length of the actuator of the switch LS1; the longer the arm, the longer the stack holds it depressed, therefore, the greater the amount of tailing edge.

A limit switch LS4 is mounted on the cradle assembly 30 and the actuator of switch LS4 is depressed against the rear surface of the roll 28, maintaining the contact open. When the diameter of paper on the roll core decreases below a given limit contacts of LS4 close thereby energizing paper low indicating light 156 at control station 25. If desired, an audible alarm could be connected in place of light 156, or both could be connected in parallel.

When the operator is ready to load a new roll 28 to the device, he moves selector switch S3 to the LOAD l position, opening the circuit to relay SCR, which causes contacts SCRZ to reopen and open the lower part of the circuit connecting the pneumatic controlling solenoids. Deenergization of yrelay SCR also recloses contacts 5CR1, which completes the circuit from line L4, through contacts 4CR1, stop switch S2, contacts 5CR1, and LOAD indicating light 152 to line L5. .LOAD indicating light is mounted on control station 25 and is energized when the selector switch S3 is in the LOAD position as described above.

With'the power thus shut olf to the pneumatic components, the operator can then replace the roll 28, slipping it over spindle 30a and holding it in place by threading hub 30h up snug against the front edge of the roll. The web 28a is payed off the top of the roll 28, under roller 3211, over position-ing roller 35, and inserted into the cutter-drive unit 20. A manual'air release valve 154 is mounted on the frame close to the control station 25, and connected in the line between air cylinder AC3 and air valve 3 AV. The operator opens this valve, which releases the air pressure on the upper side of the air cylinder AC3 and allows him to raise lever 98C of paper stop mechanism 98 while he inserts the web 28a. Web 28a is fed into the unit 20 between

guide plates

90 and 112 until it is past rollers 42)C and 128a. Then the operator recloses manual release valve 154 and the air pressure is returned to the top of cylinder AC3, holding the web in place. The device is now ready to continue operation upon reclosure of the selector switch S3 to its run position.

We claim:

In a device for feeding a web of wrap from a source of supplyunder a moving article and cutting it oli to a sheet of predetermined length, the combination comprising a pair of spaced driven rollers, a pair of spaced pressure rollers, means for alternately moving said pressure rollers into web gripping and driving relation with respective associated ones of said driven rollers, a web severing member movable to sever the web,A and means for operating the first mentioned means to effect driving relation between a driven and one of said pressure rollers to advance the web between the other driven and pressure rollers and under the article in synchronism with movement of the article, said last mentioned means thereafter affording reverse operation of the first mentioned means to effect driving relation between the other driven and pressure rollers and the aforementioned movement of said web severing member to provide cut-olf of a sheet of wrap, said last specified means including and being under the direction and control of a switch which is responsive to advance of an article to a predetermined point in relation to the device to initiate the first specified operation of said first mentioned means and which is responsive to passage of the article a given distance beyond said predetermined point to effect the aforementioned reverse operation of said iirst mentioned means and the aforementioned operation of said web severing member.

References Cited by the Examiner UNITED STATES PATENTS k 2,273,961 2/1942 Hoppe 53-66 2,342,584 2/1944 Hoppe 53-66 2,860,462 11/1958 Sykes 5 3-66 TRAVIS s; MCGEHEE, Primary Examiner.

ROBERT E. PULFREY, GRANVILLE Y. CUSTER,

FRANK E. BAILEY, Examiners.

A. E. FOURNIER, Assistant Examiner.