US2458971A

US2458971A - Method and apparatus for wrapping saw blades or the like

Info

Publication number: US2458971A
Application number: US650598A
Authority: US
Inventors: Henry E Wilson; Gerald W Wilson
Original assignee: PITTSBURGH ERIE SAW CORP
Current assignee: PITTSBURGH ERIE SAW CORP; PITTSBURGH-ERIE SAW Corp
Priority date: 1946-02-27
Filing date: 1946-02-27
Publication date: 1949-01-11
Anticipated expiration: 1966-01-11

Description

Jan. 11, 1949. H. E. WILSON ETAL' OD AND APPARA 2,458,971- MEI'H TUS' FOR WRAPPING SAW BLADES OR THE LIKE Filed Feb. 27, 1946 5 Sheets-$heet 1 Jan. 11, 1949. H. a WILSON ETAL 2,458,971

- I METHOD APPARATUS FOR WRAPPING I SAW BLADES OR THE LIKE 5 Sheets-Sheet 2 Filed Feb. 27, 1946 mm mm mm N? am w l I I' II I I Wm m w MM Jan. 11, 1949. H. E. WILSON ET AL 2,458,971

METHOD AND APPARATUS FOR WRAPPING SAW BLADES OR THE LIKE F iled Feb. 27. 1946 5 Sheets-Sheet 3 Jan. 11, 1949. 'H. E. WILSON ET AL METHOD AND APPARATUS FOR WRAPPING SAW BLADES OR THE LIKE 5 Sheets-Sheet 4 Filed Feb. 27, 1946 I INVENTORS Hear 4 Wm m W ww f WW 5w 4% M am 11, 4 H. E. WILSON ETAL 7 METHOD AND APPARATUS FOR WRAPPING.

' SAW BLADES OR THE LIKE -5 Sheets-Sheet 5 Filed Feb. 27, 1946 INVENTORS Patented Jan. 11, 1949 METHOD AND APPAR SAW BLADES Henry E. Wilson and Ger Junction, 0010., Saw Corporation, of Delaware Application February 27,

19 Claims.

This invention relates to the art of wrapping and, in particular, to a method and apparatus for wrapping thin, flat articles, specifically endlessbands, such as band-saw blades.

Because of the lack of a satisfactory machine for wrapping band-saw blades, it has been the practice heretofore to ship them bare in cylindrical containers after doubling them on them-- selves several times to provide a multiple loop of reduced diameter. When several blades are thus packed in the container, the teeth of the blades are subjected to direct contact with the backs of adjacent blades and, under the shock and vibration incident to handling and shipping, the sharpness of the teeth is materially impaired. We have invented a novel method and apparatus for applying a wrapping to the blades so that they are protected from contact with each other during shipment and may thus be delivered to the user with the teeth as sharp as they left the factory.

In a preferred embodiment and practice of our invention, we provide a table adapted to support a band placed thereon on edge with means for advancing the band along a predetermined path. We deliver a wrapping strip longitudinally of the blade and provide spaced folding guides for turning up the edges of the strip about the blade and then turning one of the edges downwardly over the We continue the application of the wrapping strip until the entire length of the band has been covered. In wrapping endless bands, we make the last fold in the wrapping strip toward the After the wrapping has been completed, we turn the band inside out,

thus stretching the lapped edges of the wrapping strip so that there is no tendency for the edges to unfold. The means for pulling the blade and wrapping guides is preferably a pair of pinch rolls which serve to crease the folds in the wrapping strip.

A complete understanding 'of the invention may be obtained from the following detailed description whichv refers to the accompanying drawings illustrating and practice. In the drawings,

Figure 1 is a plan View of our wrapping apparatus;

Figure 2 is an elevation thereof;

Figures 3 and 4 are plan views to enlarged scale of the following guides,"

Figure 5 isa transverse section taken along the plane of lineV-V of Figure 3, showing the first 1 folding guide in elevation;

upper edge of the blade.

strip through the folding a preferred embodiment ATUS FOR WRAPPING OR THE LIKE ald W. assignors to Pittsburgh, Pa., a corporation Wilson, Grand Pittsburgh-Erie 1946, Serial No. 650,598

raised position by a tension spring 26 secured H first folding guide VIIVII of Figure 3 plane of line XIX[ pivotally mounted in a block 2|. passes through manually operated of the lever 23 remote beyond the post 28 Figure 6 is a similar section taken along the plane of line VIVI of Figure 4, showing the second folding guide in elevation;

Figure 7 is a horizontal section through the taken along the plane of line 5; V

Figure 8 is a similar section through the second folding guide taken along the plane of line VIII-VIII of Figure 6;

Figure 9 is a plan view of the table to enlarged scale with the folding guides removed;

Figure 10 is a transverse section taken along the plane of line XX of Figure 9,

Figure 11 is a similar section taken along the of Figure 1;

Figure 12 is a diagrammatic plan view to enlarged scale showing the several stages in the folding of the strip about the band.

Figures 13 through 15 are sectionsthrough the j ustrip as it is being wrapped taken along the planes of the correspondingly numbered lines of Figure 12;

Figure 16 is a perspective view of a band after it has been Wrapped; and V 4 Figure 17 shows the same band after it has been turned inside out.

Referring in detail to the drawings and, for the present, particularly to Figures 1 and 2, our apparatus comprises a table [0 including a bandsupporting portion ll' of any desired size and a strip-feedingand folding portion l2. The table is adapted to support an endless band l3 on edge for movement through a predetermined path during which movement the wrapping strip is progressively applied thereto and folded thereabout. 7

The strip-feeding portion [2 of the table ID has legs [4 and I 5. A roll of wrappingstrip I6 is disposed in a suitable holder l1 attached to the legs l5 and the strip S drawn therefrom passes over a guide roll I8 at the righthand end of the table. The strip is fed along the table between side guides l9 and under a tensioning foot 20 The strip then cross cut shear As shown in Figure 11, this-shear comprises thereto and to a bolt 21 on a guide post 28. The

posts

24 and 28 are secured to the sides of the strip-feeding portion 12 of the table. The end from the post 24 projects and forms an operating handle. It will be apparent that the strip S may be cut off when desired by downward movement of the lever 23. The shear 22 serves to sever the strip when the wrapping of a band has been completed.

A guide roller of the table beyond l3 as it approaches said 29 at one side of the portion |2 the shear 22 directs the band portion and successively enters strip-folding guides 3|] and 3|. A guide 32 adjacent the roller 29 insures the proper entry of the wrapping strip under the lower edge of the band. The guides 30 and 3| are in the form of blocks hinged to a plate 33 on the strip-feeding portion |2 of the table. This plate is actually formed of two pieces but will be referred to as a single member. As clearly shown in Figures 3 and 5, the guide 30 is pivotedto a hinge block 34, has an operating handle 35 and is yieldably held in operative position by a spring pressed detent 36 mounted in a block 31. The guide 30 has an insert 3-8 which may conveniently be of fiber or other easily machinable material. The insert is removably secured in place by any convenient means and is provided with longitudinal slots 3-9 and 40. The insert 38 extends downwardly into a central longitudinal recess 4| in plate 33. As shown in Figure 9; the recess includes a tapering entrance 41a, a restricted portion 4|b and a wider portion Me. The slot 39 is dimensioned to admit the band H! as it is moved forward through the guide by traction means to be described subsequently. The slot flares toward the entrance end "as clearly shown in Figures 3 and 5. The slot is adapted to receive one edge of the strip S and serves when the edge is properly started thereinto,.progressively to fold up the edge as shown in Figurel. The material of the insert 38 which is left when the

slots

39 and 40 are cut out forms a central. longitudinal guide fin 42.

The folding guide 3-'| also comprises a block pivoted toa hinge block 43. It has a handle 44 and is yieldably held in operative position by a spring-pressed. deten t 45111 a block 46. An insert 41 of fiber or the like is re'i'novably secured to the block 3| and extends downwardly therefrom into the recess Me. The insert 41' has a longitudinal slot 48 therein flaring toward the entrance end which admits the band with both edges of the wrapping strip folded upwardly around the lower edge of the band. As the band and strip enter the guide 30, the edgeof the strip projecting above the band is progressively folded downwardly therearou'nd.

The tracticn means for pulling the band and wrapping-strip through the guides 38 and 3| comprises a pair of pinch rolls 49 and 50 as shown to enlarged scale in Figures 9 and 10. The roll 19 is mounted on a shaft 49a journaled in the table portion l2. The roll 50 is mounted on a shaft 500 journaled in a blockpivoted to the table portion 1 2 on a pin 52. A compression spring 53 disposed in recessesin the table portion l2 and the block 5'! normally urges the latter outwardly whereby "therolls are opened. A shaft 54 extending through the block 5| and threaded into a tapped hole in the table portion |2 has a fixed side cam 55 thereon. A rotatable side cam 56 cooperating therewith has an operating lever-'51. Thus bythrowing the lever, the block '51 is forced toward the table portion l2 against the compression spring 53, thereby bringing the pinch rolls into engagement with a band disposed therebetween. The rolls preferably have tires 50b of material such as rubber having a suitable coefficient of friction to enable the rolls to exert the desired tractive force.

The shafts 49a and 50a have gears 58 thereon. The shaft 50a is driven by a motor 59 mounted on the legs M of the table, through a reducing gear and a flexible coupling '61. The gears 58 are designed to permit slight movement of the block 5| incident to closing and opening the pinch rolls without disturbing the meshing relation thereof.

A guide roller 62 is journaled on the table portion l2 adjacent the pinch rolls to direct the portion of the band leaving the latter.

In utilizing the apparatus described above to perform our method of wrapping endless bands, a band, such as that shown at I3, is placed on the table I. The folding guides 30 and 3| having been swung upwardly and back out of the way and the pinch rolls having been opened up, the band is disposed in the recess 4| and between the pinch rolls. The leading end of the strip S is manually drawn forward from the shear 22 under the guide 32 and through the restricted portion 4|b of the recess 4|, the edges of the strip, of course, being folded up to permit this. The strip is so disposed laterally of the table portion |-2 that one edge thereof, when folded up about the band i3, will project upwardly above the upper edge thereof as shown in Figure 13; When both edges of the strip have been folded about the band, as shown in Figure 14, the strip edge projecting above the upper edge of the band is folded down thereover as shown in Figure 15. When the leading end of the strip thus folded has been disposed between the pinch rolls 49 and 50, the guide 3| islowered to the position shown in Figure 6, the edge of the strip being manipulated manually to permit this. Next, the guide 311 is replaced in operative position. When these preparations have been completed, the lever 51 is turned down, thereby causing the pinch rolls to seize the band and the leading end of the wrapping strip which has been folded thereabout by hand- As'soon as the pinch rollsgrip the band enclosedin the folded wrapping strip, they pull both. the band andstrip forward through the guides 30 and 3|. The latter progressively effect the folding of the strip edges about the band in the successive steps illustrated in Figures 12 through 15. That-is to say, one edge of the strip, indicated at 63, is folded up. by the guide 30; the other edge of the strip 64 remaining in its original plane and passing under the: insert 38 of guide 30. It will be observed that the edge 63 when folded extends upwardly above the upper toothed edge of the band B. On entering the restricted portion Mb of the recess 4|, however, the edge 64 is progressively folded up. This condition is illustrated in Figure 14. The upwardly projecting edge 63' of the strip is folded down over the upper edge of the band |3 progressively on entering the insert 41 of guide 3|. This condition isillustrated in Figure 15. It will be noted that the lapped edges. 53 and B4. of the strip are on the inside of the loop formed by the band.

Continued operation of. the pinch. rolls even.- tually brings the leading end of the wrapping strip toward. the entering end of the guide 3|]. The operator then manipulates the shear 22 to cut ed the strip ata point such that sufficient length is allowed to lap. the leading end as it returns to starting position. When the severed trailing end of the strip has passed through the pinch rolls, the lever 31 is operated to release the latter, whereupon the wrapped band may be removed by raising the guides 30- and 31. The pinch rolls serve to crease the folds in the wrap.- ping strip formed by the guides 30 and 3 I When the band has been removed from the guides, it is in the condition shown in Figure 16, with the lapped edges of the wrapping strip on the inside. The band is then manually turned inside out to the position shown in Figure 17 with the lapped edges of the wrapping strip on the exterior. This places the lapped edges under a slight tension circumferentially of the band which issufiicient to prevent unwrapping without the application of seals or ties. The wrapped band is then doubled on itself to form a multiple loop suitable for packing in the usual cylindrical shaped .container- It will be apparent from the foregoing that our invention comprises a highly useful method and apparatus whereby endless bands such as bandsaw blades may be wrapped easily and at high speed so that the cost of the wrapping operation is very small. The apparatus is relatively simple and inexpensively constructed and may be operated by relatively unskilled labor. The ad vantage of wrapped band-saw blades over bare blades from the standpoint of avoiding damage to the teeth edges during shipment and handling, is so obvious as to require no emphasis. A further advantage, of course, is that persons handling the blades are protected against injury by the sharp teeth "thereof. While the invention has been explained with special reference to the wrapping of band-saw blades, it will be apparent that it may also be used for other articles as well.

Although we have illustrated and described but a preferred method and practice of our invention, it will be recognized thatchanges in the details of construction and procedure may be made without departing from the spirit of the invention or the scope of the appended claims.

We claim:

1. Apparatus for wrapping saw blades or the like comprising a table, traction rolls thereon adapted to engage a blade placed on edge on the table, means for delivering a wrapping strip longitudinally of the blade, and guide blocks spaced along the table effective progressively to fold the edges of the strip around the blade as it is pulled through the blocks by said rolls.

2. Apparatus for wrapping saw blades or the like comprising a table adapted to support a blade on edge, means for advancing successive portions of the length of the blade along the table, -a pair of spaced guide blocks directing said portions in a predetermined path, the first of said blocks having means for folding up about the blade the edges of a strip of wrapping material, the second of said blocks having means for folding one of said edges down over the blade.

3. The apparatus defined by claim 2 characterized by said advancing means comprising traction rolls adjacent the exit end of the second guide block.

4. Apparatus for wrapping saw blades or the like comprising a table adapted to support a blade on edge, folding guides spaced along the table, traction means for drawing the blade through said guides, and means for supplying a wrapping strip longitudinally of the portion of the blade between the guides, said guides being adapted respectively to fold the edges of the strip upwardly about the lower edge of the blade and downwardly over the upper edge of the blade.

5. Apparatus for progressively folding a wrapping strip longitudinally about an endless band through, and means for and means such asa bandesaw. blade, comprisinga table adapted to support a band onedge, traction means for pulling the band, spaced guiideson the table having slots for the band to pass delivering a wrapping strip longitudinally of the band, one of said guides also having surfaces effective progressively to fold the edges of the strip upwardly about the band.

6. I'he apparatus defined by claim Scharacterized by said one of said guides having a slot to accommodate an edge of the strip which'extends above the band after the initial folding.

7. Apparatus for progressively folding a wrapping strip longitudinally about an endless band such as a band-saw blade, comprising a table adapted to support a band on edge, traction means for pulling the band, spaced guides on the table having slots for the band to pass through,

for delivering a wrapping strip longitudinally of the band, one of saidguides also having surfaces effective progressively to fold the edges of the strip upwardly about the band, the second guide having a surface effective progressively to fold down about the band an edge of the strip extending thereabove.

8. Apparatus for progressively folding a wrapping strip longitudinally about an endless band such as a band-saw blade, comprising a substantially horizontal table adapted to support a band on edge, traction means for pulling the band, means for delivering a wrapping strip longitudinally of theiband, a guide block for progressively folding the edges of the strip upwardly about the band, and'a second guide block for progressively folding down about the band one of said edges extending thereabove.

9. The apparatus defined by claim 8 characterized by said traction means beinga pair of pinch rolls located adjacent the outlet of the second guide block adapted to crease the folds in said strip.

10. Apparatus for progressively folding a wrapping strip longitudinally about an endless band such as a band-saw blade, comprising a table adapted to support a band on edge, a pair of pinch rolls for pulling the band, means for supplying a wrapping strip longitudinally of the band, a guide block spaced from said rolls having a slot adapted to receive the band and surfaces adapted progressively to fold the edges of the strip upwardly about the band, and a. second guide block adjacent the rolls having a slot adapted to accommodate the band and a surface adapted progressively to fold down about the band an edge of the strip extending thereabove.

11. The apparatus defined by claim 10 characterized by said blocks being liftable from the table and said slots and surfaces being formed in the bottoms of said blocks.

12. The apparatus defined by claim 10 characerized by said slots and surfaces being formed in the bottoms of said blocks, and said blocks being hinged to said table whereby they may be thrown up out of the Way facilitating the starting of a band between said rolls and its removal therefrom when wrapped.

13. The apparatus defined by claim 10 characterized by means for causing said rolls to engage and release a band disposed therebetween.

14. In a method of wrapping an endless band such as a band-saw blade, the steps including placing the band with one of its edges on a substantially horizontal supporting surface, pulling the band along a. predetermined path, feeding a strip of. wrappingimaterial alongl said path and progressively folding the the band. V v

15. Ina methodiofawraxipingan endlessband such as a band-saw blade, the-steps including placing the .band with one of its edges on a substantially horizontal. supporting surface, feed:-

edges'of the. strip around ing a strip of wrapping: material along a portion tending above the blade, folding said one edge downwardly over the blade, and continuingsaid folding progressively throughout the length of the blade. 1 i

1'2. In a method of wrapping an endless-band such as a band-saw blade, the steps including advancing successive portions of the length of the band along a predetermined path, progressively folding the edges of. a strip of wrapping material around the band toward the inside of the loop formed thereby, with one of said edges overlapping the other, and turning the fully wrapped band inside out-so the edges ofthe strip are disposed on the outside of the band.

18. Apparatus for progressively folding a wrapping strip longitudinally about an endless band such as a band-saw blade, comprising a table adapted to support a bandon edge, traction means for pulling the band, means for delivering awrappingstrip-longitudinally of the band, and guide meansfor progressively folding the edges of the strip'upwardly about the band, said guide means including ablock having a slot to accommodate theband and a slot to accommodate an edge or the strip extending above the band when folded;

'19. In amethod of wrapping a flat blade, the steps comprising simultaneously advancing the blade and a wrapping strip generally longitudinally of the blade and with the wrapping strip in contaet'with oneof the edges of the blade and during said advance progressively folding the wrapping strip so that portions of it lie on opposite sidesof the bladewith at least one of said portions extending beyond the opposite edge of the: blade and turning said portion of the wrapping strip about said opposite edge of the blade.

. HENRY E. WILSON.

GERALD W. WILSON.

REFERENCES CITED The following references are of record in the file of this pat'ent:

UNITED STATES PATENTS Number Name Date 1,500,472 Seherner July 8, 1924 1,545,022 Wheildon July 7,1925 1,837,840 Slusher Dec. 22, 1931 2,010;082- Hill Aug. 6, 1935 2,033,201 MacChesney Mar. 10, 1936 2,109,50 1 Ringler Mar. 1, 1938 2,168,583 Ringler Aug. 8, 1939 v FOREIGN PATENTS Number Country Date 327,229 Great Britain Apr. 3, 1930 Reissued May 16, 1950 Re, 25,251

Certificate of Correction Patent No. 2,458,971. January 11, 1949. HENRY E. WILSON ET AL.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 1, line 52, for the word following read folding;

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 17th day of May, A. D. 1949.

THOMAS F. MURPHY,

Assistant G'omm'z'ssz'oner of Patents.