US2642707A - Package wrapping machine - Google Patents

Description

June 23, 1953 o. SANDBERG 2,642,707

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PACKAGE WRAPPING MACHINE,

Filed Jan. 29, 1049 18 Sheets-Sheet 17 :25 .977 jjiifi- II I11" i l l HI!" ug] I :5 r "o 3&3]. 420 Ill 4?)? 1 1 ama gam June 23, 1953 o, s ND 2,642,707 W PACKAGE WRAPPING MACHINE Filed Jan. 29, 1949 18 Shoots-Sheet 1a Patented June 23, 1953 UNITED STATES PATENT OFFICE PACKAGE WRAPPING MACHINE Oscar Sandberg, Toledo, Ohio, assignor to Lynch 7' Corporation, Anderson, Ind., a corporation of j Indiana Application January 29, 1949, Serial No. 73,489

22 Claims.

around the stack, following which a label is applied to one or both ends of the wrapped package, all the necessary operations being performed in a rotary head while the head rotates through three-fourths of a circle and the finally wrapped and labeled package being discharged from the rotary head and from the wrapping machine.

Another important object of my present invention is to provide a wrapping machine so designed that it can operate at relatively great speed, that is wrap a relatively great number of packages in a unit of time, this being accomplished by a minimum of handling of the package in the machine while it is being wrapped and all the wrapping operations being performed While the package is held in one position in the rotary head, the head being intermittently operated so that the package is stopped at a number of stations during the three-fourths circle rotation of the package from the intake station of the rotary head to the out-going station thereof. A further object is to provide a rotary head provided with pockets which successively receive the stacks of sandwiches and the wrappers therefor, certain folding operations of the wrapper being performed by the reception of the sandwiches into a pocket, the pocket then being moved to successive stations where further wrapping operations are performed, some wrapping operations being performed by mechanism operable upon the package while it is in movement, and heating mechanisms being provided to contact with the wrapper at certain stations to heat seal the wrapper around the sandwiches.

Still a further object is to provide a labeling device for efi'iciently applying a label to an end of the completely wrapped package while it is at one of the stations of the rotary head and for heat sealing the label thereto, after which the rotary head advances further and at another station the completed and labeled package is pushed out of the pocket of the rotary head into a discharge conveyor of the wrapping machine.

An additional object is to provide a rotary head with pockets to receive stacks of sandwiches, the pockets being openable and closable, and being provided with end flap folders for the package which at a certain station are moved to retracted position to permit other end flap folders to operate at that station, the final end folds being completed by rotation of the head to a position between folding and heating plates which fold the last end folds of the wrapper and heat them for effecting complete sealing of the sandwiches within the wrapper.

Another additional object is to provide a wrapping machine in which a rotary head has a relatively great number of pockets for the reception ofsandwichesor other articles to be wrapped and rotates each cycle of operation of the wrapping machine an angular distance equal to that between the pockets, wrapper folding operations being performed at various stations throughout a half revolution of the head and the wrapped article being discharged at the end of another onefourth revolution thereof after alabel has been applied to one end of the package, or to both ends if desired.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my wrapping machine whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims and illustrated in the accompanying drawings, wherein:

Figure 1 isa partial side elevation of a wrapping machine embodying my present invention, showing the majority of the elements thereof but omitting most of a rotary head. This view is taken from the left side of the machine, considering the article intake end as the rear end thereof.

Figure 2 is an enlarged plan view of the left hand end of Figure 1 showing the discharge end of the machine.

Figure 3 is a similar plan view of the right hand end of the machine and is a continuation of Fig ure 2,'the rotary head being cut through. at the center and sectioned, and the shaft for supporting it having parts broken away.

Figure 4 is an enlarged side elevation of the left half of Figure 1, this view being'on the same scale as Figure 2 and being a side elevation ofv ure 1 at the same scale as Figures 2, 3 and 4, r and is an overlapping continuation of the right hand end of Figure 4.

Figure 6 is a front elevation of operating mechanisms of the machine as viewed from the left side of Figure 4, this figure being on the same scale.

Figure 7 is a plan view similar to Figure 3 but omits the rotary head, this figure showing the fourth end flap folding and heating shoes and the first circumferential flap folder omitted from Figure 3.

Figure 8 is a side elevation of the rotary head removed from the machine, this view being of the right side of the head and the parts being shown in the positions they would assume without any of them being actuated as they would be if the head were mounted in the machine.

Figure 9 is a side elevation of one of the pockets of the rotary head and its mounting means from the reverse or left side of the head.

Figure 10 is a left side elevation of a portion of the machine as shown in Figure and illustrating the rotary head mounted in connection therewith.

Figures 11 and 12 are views similar to a portion of Figure and showing the parts in different positions assumed during operation of the machine.

Figure 13 is a plan view of a first circumferential flap folder shown at the left side of Figure 11, the parts being in the position shown in Figure 12.

Figure 14 is an enlarged detail sectional view on the line l4i4 of Figure 13. 1

Figure 15 is a horizontal sectional view on the line l5-l5 of Figure 8 through the center of the rotary head showing details of construction particularly with respect to first end flap folders carried thereby.

Figure 16 is a sectional view on the line l8-i6 of Figure 8 showing a package holder.

Figure 11 is an end elevation of one of the pocket units of the rotary head as viewed on the line l1l1 adjacent the left side of Figure 8.

Figure 18 is an enlarged elevation of a package labeling mechanism, this view being taken on the section line l8-l8 adjacent the top center of Figure 1.

Figure 19 is a detail sectional view on the line l9l9 of Figure 18.

Figure 20 is a plan view on a slightly enlarged scale of the labeling mechanism shown in Figure 18, with label roll supporting brackets shown in section as on the line 2ll29 of Figure 18.

Figure 21 is an enlarged vertical sectional view on the line 2!-2l of Figure 20.

Figure 22 illustrates a full size length of a label strip used in connection with the labeling mechanism.

Figure 23 is an enlarged left side elevation of a vacuum valve and the control mechanism therefor used in connection with the labeling mechanism.

Figure 24 is an enlarged left side elevation of a vacuum pump and adjacent mechanism of the wrapping machine.

Figure 25 is a fragmentary detail showing a trip clutch for the labeling mechanism.

Figure 26 is a fragmentary detail showing the control mechanism for the trip clutch of Figure 25.

Figure 27 is a another view of the trip clutch of Figure 25 as taken on the section line 21-21 thereof.

Figure 28 is a plan view of certain portions of Figure 20 to show operating details of the labeling mechanism, the label roll supporting brackets 4 being shown in section on the line 28-28 of Figure 21.

Figure 29 is an enlarged sectional view on the line 29-49 of Figure 6 showing the cam for operating the trip clutch and other parts of the mechanism.

Figure 30 is an enlarged left side elevation of the outlet conveyor of the wrapping machine with portions broken away and other portions shown in section to illustrate details thereof, together with adjacent parts of the machine in relation thereto.

Figure 31 is a plan view of the outlet conveyor of Figure 30.

Figure 32 is a cross section through a package of four sandwiches wrapped in my machine.

Figure 33 is a similar view of a five sandwich package, the machine being readily adjustable for either size ackage.

Figure 34 is a diagrammatic view of the drive mechanism between a main shaft and some of the remaining parts of the mechanism of the wrapping machine which parts rotate continuously, and

Figure 35 is a similar diagrammatic view of other parts of the machine which are rotated intermittently.

On the accompanying drawings, I have used the reference numeral 40 to indicate a front frame member and 4| a rear frame member. The frame members 40 and 41 are connected together at their upper ends by a table 42. A pair of rotor supporting side frames 43 of inverted U- shape are mounted on the table 42 and are provided with bearings 43!) which rotatably support a rotor shaft 44.

A rotary package carrying and wrapping head indicated generally by the reference character R and shown per se in Figure 8 is provided including side plates 45 and 46 secured to the shaft 44 by a key 41. For simplicity in referring to the rotary head R, I will hereinafter call it merely a rotor. The rotor R is provided with eight sandwich and wrapper receiving pockets arranged radially as shown generally in Figure 8 and is rotated 45 degrees or one-eighth of a revoluton each cycle of operation of the machine so that any one pocket during one complete rotation of the rotor assumes eight different positions or stops at eight different stations. These stations have been numbered (1) to (8) in the specification and are shown within circles throughout various figures of the drawings for convenient reference to the different positions or stations and the operations that take place at those stations.

For effecting one-eighth revolution or angular rotation of 45 degres of the rotor it each cycle of the machine, I provide a sprocket 30 on a shaft 434 around. which a chain. 15! extends. This chain also extends around a sprocket I32 on the rotor shaft 44 as in Figure 5. An idler sprocket I53 is provided for taking up play in the chain. Throughout the drawings, some of the sprockets and chains are shown merely diagrammatically to avoid the crowding of details.

The sprocket 163 has three-fourths as many teeth as the sprocket 162 so that each sixth of a rotation of the shaft 434 results in one-eighth rotation of the shaft 44 as required for stopping the pockets of the rotor at the eight different stations designated.

One of the pockets of the rotor will now be described. On each rotor side plate 45 and 46

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