US2817938A - Wrapping machines - Google Patents

Description

1957 c. B. BENNETT 2,817,938

WRAPPING MACHINES Original Filed Dec. 15, 1950 5 Sheets-Sheet 1 A I INVENTOR 4 62/15020 B Bewzverr ATTORNEYS Dec. 31, 1957 c. B. BENNETT 2,817,938

WRAPPING MACHINES Original Filed Dec. 15, 1950 5 Sheets-Sheet 2 ATTORNEYS Dec. 31, 1957 c. B. BENNETT 2,817,938

WRAPPING MACHINES Original Filed Dec. 15. 1950 3 Sheets-Sheet 3 BY MYM ATTORNEY5 WRAPPING MACHINES Clifford B. Bennett, Atlanta, Ga., assignor to Southern Saw Service, Inc., Atlanta, Ga., a corporation of Georgia Continuation of application Serial No. 201,049, December 15, 1950. This application September 16, 1954, Serial No. 456,566

6 Claims. (Cl. 53-204) This invention relates to wrapping machines and has particular reference to a greatly improved and simplified machine especially designed for wrapping endless bands, such as band-saw blades and the like.

One of the objects of the invention is to provide a greatly simplified machine for applying and folding a wrapping strip about an endless band or band-saw blade to'protect the teeth of the blade during shipment and to prevent it from rusting or becoming soiled before it is used.

Another object of the invention is to provide an improved machine, as above characterized, having simplified folding means for applying a wrapping strip to a band-saw blade while it is suspended and fed through the machine by traction rolls.

Another object of the invention is to provide a wrapping machine, as above characterized, having means for forming longitudinal creases in a wrapping strip to facilitate folding the marginal flanges of the strip about a blade.

Still another object of the invention is to provide a machine, as above characterized, which is simple and rugged in construction, very efficient in operation and can be controlled by a single operator.

Other objects and advantages of the invention will appear in the specification, when considered in COlJHflC'r tion with the accompanying drawings, wherein:

Fig. 1 is a perspective view of a machine embodying the invention;

Fig. 2 is a fragmentary perspective view of parts of the machine shown in Fig. 1;

Fig. 3 isanother fragmentary perspective view showing folding means employed in the machine;

Fig. 4 is a fragmentary side elevation showing the folding mechanism in its operative position;

Fig. 5 is a fragmentary side elevation of the machine shown in Fig. 1, parts being omitted for the sake of clarity, and

Fig. 6 is a fragmentary plan view showing the manner of folding a wrapping strip about a blade.

This application is a continuation of my prior application Serial No. 201,049, filed December 15, 1950, and now abandoned.

Referring more particularly to the drawings, the ma chine is particularly designed for applying paper wrapping strips about band-saw blades used in the meat cutting industry. Such blades are usually curled up or folded two or more times into small convolutions and shipped to the users in bags or containers to prevent their teeth from coming in contact with each other.

folding opposite marginal edges around the side edges of. the blade in overlapping relation on one side and the wrapping strip will remain in its folded condition to protect the blades until they reach their destination, thereby avoiding the necessity of using separate containers.

In the The machine automatically applies wrapping strips to the blades by upper traction roll 13.

illustrated embodiment of the invention, the mag a I 2,817,988 Ice Patented Dec. 31, 1957 chine is shown as having a supporting frame 10, conveniently made of structural angles or the like, carry ng horizontal members 11 at the top which support traction rolls 12 and 13, preferably made of vulcanized rubber or like resilient material, for gripping and feeding a blade B through the machine. The traction rolls are adapted to be driven by a motor 14 mounted on a shelf 15 below the top frame members 11. The motor is shown as having a V-belt 16 trained over a pulley 17 mounted on a shaft 18 carried by bearings on intermediate frame members 19 which support the shelf 15. A small driving pulley 20 is loosely mounted on the shaft 18 and is adapted to be clutched to the hub of the driving pulley 17 by means of a clutch lever 21 and clutch mechan sm, well known to those skilled in the art. A V-belt 22 drives a pulley 23 on a shaft 24 extending across the upper frame members 11 and carrying the bottom traction roll 12. A friction disc 25 is shown as being mounted on the shaft 24, adjacent to the pulley 23, and coacts with a similar friction disc 26 on a shaft 27 which carries the A hand wheel 28 is mounted on the inner end of the shaft 27 to enable the operator to thread a new blade and the leading end of the wrapping strip between the rolls before the machine is started.

The shaft 27, carrying the upper traction roll 13 and friction disc .26, is shown as being mounted in a single bearing 29 carried on the upper end of an arm 30 which is pivotally connected at 31 to brackets 32 on the upper frame member 11. The upper traction roll is adapted to be raised mechanically to disengage it from a wrapped blade and permit a paper strip and a new blade to be threaded into the machine. For that purpose, there is shown a cam member 33 mounted on a shaft 34 supported in bearings 35 below the arm 30 and a hand lever 36 is connected to the shaft 34 to operate the cam and bring its high part into engagement with the bottom of the arm 30 to lift and support the upper traction roll in its raised position, as shown in Figs. 1 and 2.

A roll of paper 37 is shown as being carried by a reel 38 mounted on a shaft 39 journaled in bearings on the lower horizontal frame members 19. The reel has a removable face plate or flange 40 to permit a new roll of paper to be inserted on the shaft. A retarding leaf spring 41 is shown as being connected to one of the frame members 19 and frictionally engaging the rear flange of the reel 38 to prevent it from spinning freely.

As shown in Fig. 1, the paper strip is threaded in the machine ready to be applied to a band-saw blade. It first passes over a channel-shaped guiding roll 42 carried by the frame. Then, the strip is threaded around a channel-shaped creasing roll 43 on which parallel creases 44 are formed on opposite sides of the strip by means of a coacting creasing roll 45 having sharp flanges 46 which engage the upper face of the paper strip and force it into the channel-shaped roll 43 to makethe creases. The creasing roll 45 is shown as being mounted on an arm 47 pivoted to a bracket 48 on one leg of the frame, the arrangement being such that the creasing roll may be swung outwardly away from the coacting roll 43 to permit the paper strip to be initially threaded therebetween. The creasing roll 45 is also shown as having a U-shaped handle 49 to enable it to be lifted manually out of engagement with the creasing roll 43. To hold the roll 45 in creasing engagement with the roll 43. there is shown a coil spring 50 connecting the cross bar of the handle to a stationary frame member or brace 51. The creased paper strip is shown as passing over a channel-shaped guide roll 52 mounted on a shaft 53 carried by a slotted arm 54 adjustably secured to a bracket on one of the upper members 11 of the supporting frame, as shown in Fig: 1.

The band-saw blade B is shown, in Fig. 1, as being suspended from the guide roll- 52' and the lower traction pivoted arm 56 at the right hand end of the machine, to-

guide it over the central part of the channehshaped' guide roll 52 between the creases 44 formed in the paper strip, whereby the opposite side edges of the strip may be folded. over the upper side of the blade in overlapped relation. To insure that the blade is fed over the guide roll 52 in this manner, there is shown an adjustable guide plate 57 carried by a shaft 58 mounted in a bearing 59 on the upper end of an adjustable arm 60. The arrangement is such that the guide plate 57 contacts the smooth back edge of the blade and prevents it from wobbling on the guide roll 52.

The paper strip and the saw blade are then threaded, by hand, through the folding mechanism to fold the opposite creased edges of the strip over the top of the blade. As shown in Figs. 3 and 4, the folding members are shown as comprising opposed arms 61 and 62 pivoted at63 and 64, respectively, on a downwardly extending bracket or plate 65. The arm 61 is shown as carrying a folding member 66 made of hardwood and having a narrow, U-shaped gap or slot- 67 through which the toothed side of the saw blade is fed, with the teeth on the blade pointing rearwardly. The arm 62- isshown as having a V-shaped gap or slot: 68 which isadapted to be swung into engagement with the smooth rear edge of the saw blade with its bill overlapping the open end of the folding member 66. The arrangement is suchthat, when the two members are thus moved into folding position straddling opposite edges ofthe blade, their folding surfaces will fold the marginal side edges of the paper strip over the top of the saw blade. The folding member 66 will fold both creased edges or flanges of the paper strip over the upper side of the blade; while the other member 68 will flatten the folded-under flangeof the paper strip, accentuating the crease over the smooth back edge of the blade.

When the machine is to be operated at high speed, it is preferred to form. the preliminary folds. and to thread the paper and bladein the machine so that. the folding member 66 receives the corresponding edge or flange of the paper strip and causes it during running. to be laid down upon the upper side of theblade; and sothat the other edgeor flange .of the paper strip. passes over the upper part of the folding member 66 and is guided downward by the upper wall of the gap or slot 68 in the arm 62.

The two folding members or guides 66 and 68 are held in their active folding position, asashown in Fig. 4, by means of a tension spring 69 connected to the arms 61 and 62 near their upper ends. The arms have depending handles or levers 70 to permit them to be manually opened separately or simultaneously, when it is necessary to adjust the folded edges of the wrapping strip. Obviously, one of the folding members may be stationary, and the other may be movable to release or engage the blade and paper strip. However, the arms are adapted to be opened simultaneously and both folding members held open by means of a cam member 80 positioned between the arms on a shaft 81 journaled in the bracket plate 65 and adapted to be manually rotated a quarter turn to pry the arms apart, as shown in Fig. 3. In this position, the cam. member will hold the arms open to permit the wrapping strip and blade to be adjusted in the machine without requiring the. operator to use one hand onthe handles 70.

The wrapping strip andibladeare adaptedto besuppotted onarledge or plate 83 mounted onqa supporting bracket 84 which also carries the depending-x'plate or bracket. The supportingplate is shown as having spaced guiding lugs 85 between which the wrapped'bladc is guided into contact with the upper surface of the traction roll' 12;

When the wrapping strip is first threaded through the machine and a blade is inserted in place, it will be understood that the upper traction roll 13 will be raised to the position shown in Figs. 1 and. 2;. the folding members will be opened, as. shown in Fig. 3; and the movable creasing roll 45 will be manually lifted to permit the free end of the paper strip to be pulled ofl the roll, 37 and.

guided into.- its wrapping position. over the guide roll 52 between the opening folding members 66 and 68, and between the guiding lugs or shoulders over the traction' roll 12. Then, the saw blade is placed on top of the creased wrapping strip and suspendedover the guide roll 55, also resting on the guide roll 52, the supporting ledge 83, and the traction roll 12. When the strip and blade are in this position, the operator folds over the flanged edges. E of. the free end. of the wrapping strip at the. creases adjacent to the two folding members 66 and 68. Then, he turns the handle 82 of the cam 80, permitting the folding members to close on the foldedover free edges. Then, the cam lever 56 is operated to lower the upper traction roll into gripping engagement I with the naked saw blade and the hand wheel 28 on the. upper roll. shaft is turned to pull the blade and the folded.

wrapping strip into gripped engagement. with both rolls, in which condition the initially wrapped blade is adapted to be fed through the machine automatically by the driving motor 14. The clutch lever 21 is then shifted to engage the driving pulley 20 with the pulley 17 to drive.

the. rolls andpull the rest of the blade through. the ma? chine.

To prevent the saw blade from whipping out of en gagement with the guide roller 52, as it approaches the folding members, there is shown a hold-down or tensioning roller 86 journaled on an upstanding arm 87 which is pivotally mounted on a bearing member 88 secured to the top frame member 11. The arm is adapted tov be swung rearwardly, as shown in Fig. 5, to bring the roller into contact with the naked upper surface of the blade adjacent to the guide roller 52. The roller 86 is narrower than the spacing between the end flanges of the guide roller 52, and preferably is of the same width as the separation of the creases 44 on the paper strip, i. e.,, essentially of the width of the blade; and when in operating position, the roller 86 depresses the part of the blade and the paper strip between the guide roller 52 and the folding members 66 and 68 for producing a partially folding of the margins of the paper strip into a channel-like form in the base of which is positioned the blade, so that the folding members 66 and 68 then act upon the thus folded edges of the strip. That is, the forming of the channel in the paper strip is being accomplished while the-strip and blade are being bent downward or re-entrantly relative to the general shape of the endless saw blade as it is moving in its orbit. In order to-raise this hold-down roll'er out of engagement withv a wrapped blade and permit the blade to beremoved from the machine, it is shown as being adapted to be lifted simultaneously with the upper traction roll 13. For that purpose, there is shown a link 89 connected to a bracket arm 90 mounted on the bearing member 29 which carries the shaft 27 on which the upper traction roll is mounted. The other end of the link is connected to a crank arm 91 on ashaft 92 which carries the pivoted arm 87. The. lengths of the. arms 90 and 91 are such that, when the traction roll 13 is raised to its uppermost position, the hold-down or tensioning roll 86 will be swung upwardly to itsblade-releasing position, thereby permitting a. fully, wrapped blade to be removed and a new blade to. be insertedinthe machine, without requiring separate manual operations to lift both, rolls.

From the. foregoing description, it will. be noted that the bladewill be fed. through. the machine and: wrapped automatically by the coacting folding; members 66 and. The operator merely cuts off the paper wrapping strip with a knife or scissors at a point between the creasing rolls 43, 45, and the guiding roller 52, thereby leaving a free end of the strip to be grasped by hand and again threaded in between the opened folding members 66, 68, ready for another blade to be placed in position on the machine, as hereinbefore described. The operator observes the position of the leading end of the wrapped strip, stops the machine by operating the clutch lever, and cuts off the strip at a point which insures that the entire blade will be fully wrapped, with the trailing end of the strip slightly overlapping the leading end. Then, he turns the traction rolls by the hand wheel 28 to fold up the trailing end of the Wrapping strip. The blade is then removed from the machine and folded up, ready for storage and subsequent shipment.

From the foregoing description, it will be apparent that the machine is very simple in its construction and can easily be operated by a single workman. The margins of the paper strip are brought into overlapping position at the outside of the blade and are so held as the blade travels in its closed orbit for the reason that each margin would have to increase in length to unfold. The overlapping margins of the wrapping strip closely engage the surface of the blade and do not tend to become unfolded during the manipulation of the blade to fold it into small convolutions. The wrapped blades are fully protected from moisture, which would cause rusting, and the teeth are shielded by the wrapper so that they will not rub against the teeth of other blades during transportation. The wrapper can easily be stripped off the blades at the place of use.

Obviously, the invention is not restricted to the particular embodiment thereof herein shown and described.

What is claimed is: 4

1. In a machine for applying a wrapping strip longitudinally about a band-saw blade or the like, a supporting frame adapted to suspend the saw blade vertically; a pair of relatively movable traction rolls mounted one above the other for supporting and pulling the blade through the machine; means for supplying a wrapping strip longitudinally of the blade to engage one face thereof; a pair of coacting folding members spaced from said traction rolls and located opposite each other on opposite sides of the path of travel of the blade and strip and each having a horizontal strip folding recess coacting to form a passageway adapted to receive the blade and strip and presenting surfaces adapted to simultaneously engage and fold the opposite edges of the strip over the opposite side edges of the blade; at least one of said folding members being separately movable substantially horizontally toward and away from the path of travel of the blade to permit the blade and strip to be inserted between said members and removed from the machine; and power operated means connected to drive the traction rolls.

2. In a wrapping machine, as set forth in claim 1, wherein the folding members are carried by a pair of arms pivotally mounted with respect to said frame and are adapted to be opened to permit insertion and removal of the blade and strip; and manually operable cam means coacting with said arms to open said members and hold them open.

3. In a wrapping machine, as set forth in claim 1, wherein a channel-shaped guide roller is mounted on the frame rearwardly of said folding members to guide the strip with the blade thereon to said folding members; a movable hold-down roller mounted on the frame for holding the blade in engagement with the strip on said guide roller; and means connecting said hold-down roller to the movable traction roller whereby said hold-down roller will be moved out of engagement with the blade when the traction rolls are opened.

4. In a machine for applying a wrapping strip longitudinally about a band saw blade or the like, a supporting frame; a pair of relatively movable traction rolls supported by the frame for engaging and pulling the blade through the machine; means for applying a wrapping strip longitudinally of the blade and into engagement with one face thereof; a first guide roller for supporting the wrapping strip adjacent its engagement with the blade, a second guide roller of essentially the width of the blade to engage the blade between the first guide roller and the traction rolls; folding means on the frame for causing marginal edges of the paper strip to be folded over the edges of the blade and located between the said guide rollers and the traction rolls; means for rotatably mounting the guide rollers on the frame including means for moving the second guide roller from an inoperative position out of engagement with the blade to an operative position in engagement with the blade, with the second roller so positioned that when in operative position it is effective to cause the blade to move in a downwardly convex path between the first guide roller and the said folding means, and to cause the strip to be partially folded to a channel 'shape with the blade therein; and power operated means connected to drive the traction rolls for pulling the blade and strip through the machine.

5. In a wrapping machine as set forth in claim 4, ineluding a pair of coacting creasing rolls rotatably mounted on the frame and positioned to engage the Wrapping strip before it engages said first guide roller and form two spaced longitudinal creases therein about which the opposite margins of the strip are adapted to be folded.

6. In a machine for applying a wrapping strip about a band saw blade or the like, a supporting frame; a pair of relatively movable traction rolls supported by the frame for engaging and pulling the blade through the machine; a reel mounted on the frame for rotation about a horizontal axis and adapted to carry a roll of the wrapping strip; a pair of coacting creasing rolls rotatably mounted on the frame and positioned to engage the wrapping strip to form two spaced longitudinal creases therein about which the opposite margins of the strip are adapted to be folded; and a channel shaped guide roll mounted on the frame for rotation about a horizontal axis and positioned to guide the strip and blade with the blade flatwise on the strip between the creases; folding means mounted on the frame and positioned between said traction rollers and said guide roll for causing the marginal parts of the wrapping strip to be folded over the edges of the blade; a movable hold down roller mounted on the frame for holding the blade in engagement with the strip on said channel shaped guide roll; means connecting said hold down roller to the movable traction roll whereby said hold down roller will be moved out of engagement with the blade when the traction rolls are open; and power operated means connected to drive the traction rolls to pull said blade and wrapping strip through the machine.

References Cited in the file of this patent UNITED STATES PATENTS 2,276,282 Bindszus Mar. 17, 1942 2,298,363 Ganz Oct. 13, 1942 2,458,971 Wilson Jan. 11, 1949 FOREIGN PATENTS 327,229 Great Britain Apr. 3, 1930

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