US2663352A

US2663352A - Edge trimming machine

Info

Publication number: US2663352A
Authority: US
Inventors: Keller Harry
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-10-19
Filing date: 1951-10-19
Publication date: 1953-12-22
Anticipated expiration: 1970-12-22

Description

Dec. 22, 1953 H. KELLER EDGE TRIMMING MACHINE Filed 001;. 19, 1951 4 Sheets-Sheet 1 INVENTOR.

HHRRY -ELLER.

HTTORNEY 1 Dec. 22, 1953 H. KELLER EDGE TRIMMING MACHINE 4 Sheets-Sheet 2 Mal Filed Oct. 19, 1951 INVENTOR.

HTTORIUEV Q was:

EDGE TRIMMING MACHINE Filed Oct. 19, 1951 4 Sheets-Sheet 3 INVENTOR.

HARRY KELLER- Dec. 22, 1953 H. KELLER EDGE TRIMMING MACHINE INVENTOR.

HBRRY KELLER W ATTORNEY Patented Dec. 22, 1953 UNITED STATES E ATENT OFFICE.

2,663,352 EDGE TRIMMING MACHINE Harry Keller, Philadelphia, Pa.

Application October 19, 1951, Serial No. 252,030

10 Claims. (01. 154 41) This invention relates generally to machines for edging cardboard and similar sheet material and is more particularly concerned with improvements in the class of such machines which fold a continuous tape of binding material about strips of cardboard placed therealong and then sever thetape between the strips of cardboard, the aforementioned improvements affording particular advantage with regard to the spacing and severing operations.

Known machines of the aforementioned class are characterized by automatic feeding of the binding tape, manual feeding of the boards to 'be bound, and automatic cutoff between the if they are spaced either too far apart or too close together, the automatic cut off is thrown out of proper timing.

Accordingly, it is an object of this invention to provide a machine for edging cardboard with .means for automatically relatively spacing strips of cardboard as they are fed into the machine.

Another object of this invention is to provide such a machine with means for severing the binding tape between the strips of cardboard,

such means being automatically operative independently of thelength of the cardboardstrips and of any spacing therebetween in excess of a minimum predetermined spacing.

Other objects and advantages of the present invention will appear more fully hereinafter, it being understood that the present invention consists in the combination, construction, location and relative arrangement of parts, all as will be more fully described hereinafter, as is shown in the accompanying drawings and will be pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a perspective View of a machine embodying the present invention, looking toward the front from the left side thereof;

Figure 2 is a sectional elevationalong line 2-2 of Figure 1 looking in the direction of the arrows and showing an upper portion of the machine;

Figure 3 is a section along line 33 of Figure 4 looking 'in the direction of the arrows, the cardboard strips being shown.

Figure 4, is a section along line 4-4 of Figure 2 looking in the direction of the arrows, the cardboard strips being omitted for the sake of clarity.

Figure 5 is a perspective View showing the out off mechanism, looking toward the rear and from the right side thereof; I

Figure 6 is a perspective view taken along line 56 of Figure 2;

Figure 7 is a perspective view of the machine of Figure 1, looking toward the front from the right side thereof;

Figure 3 is a section along line 88 of Figure '7;

Figure 9 is a sectional view through the cut off mechanism, looking from the right side thereof and showing the knife in its lowermost position and the binding tape cut.

Figures 10 to 13, inclusive, are sectional views through the cut off mechanism, looking from the left side thereof and showing the associated parts in varying'positions as the work is fed through the machine;

Figurelg is a plan view of the bindingtape folded about strips of cardboard and ready to be severed;

Figurel5 is a section along line l5-l 5 ure 14;

Figure 16 is a section along line Iii-l6 of Figure 14;

Figure 17 is a diagram showing the electric circuit controllingthe cut off mechanism.

Figure 18 is similar to Figure 3 but shows th spacing element riding on the upper surface of a cardboard strip being fed through the rollers and another strip in position waiting to follow.

The apparatus of the present invention comprises an elongated open frame structure 20 hav- 33-33 to 3838 rigidly secured to frame structure 20, each of the rollers having an end portion overhanging the associated bearing and fixedly mounting a chain sprocket as and a spur gear Al,

the latter being disposed intermediate the chain sprocket 39 and the associated bearing. The several sprockets 39 are disposed for rotation in a common vertical longitudinal plane and have an endless chain 42 trained thereover, excessive slack in the chain 42 being taken up by a plurality of idler sprockets 43 suitably mounted on frame structure 20.

The roller devices 2| and 23 to 26 also comprise respectively upper rollers 44 to 48 rotatably mounted in the associated bearings 33--33 and 3535 to 38-38 and disposed thereby in parallel superimposed relation to the associated lower rollers, each of the upper rollers being downwardly spring pressed and having an end portion overhanging the associated bearing and fixedly mounting a spur gear 49 disposed in meshing engagement with the associated gear M.

More particularly with regard to rollers 21 and 44, these two rollers have respectively similar opposed reduced portions I and 52 intermediate the opposite ends thereof. Mounted on the reduced portion 52 is a collar 53 having an external diameter equal to that of roller 44, and having oppositely facing end surfaces disposed in abut-.- ting relation to the opposed sharp shoulders formed by reduced portion 52. The fit of collar 53 on reduced portion 52 and between the sharply defined shoulders formed by the latter is such that due to frictional contact collar 53 will rotate with roller 44 when no resistance is offered to such rotation, but will not turn therewith when any substantial resistance is encountered. Integrally formed with collar .53 and projecting radially outwardly therefrom is a spacing element 54 having opposed outwardly converging surfaces 56 and 57 and oppositely facing side sur- "faces 58 and 59 set back from the sharply defined shoulders formed by reduced portions 5| and 52, the spacing element 54 being of such a length that it clears reduced portion 5| when collar 53 rotates with roller 44.

Now more particularly with regard to rollers 30 and 46, roller 46 comprises a central shaft BI mounting a pair of folding disks EL -62 secured in a suitable manner to spaced portions thereof for rotation therewith, and roller 30 comprises a central shaft 63 mounting a pair of folding disks 6464 on spaced portions thereof for rotation therewith, disks 64-64 being thereby disposed outwardly relative to disks 62-62, and being spring pressed for relative axial movement toward disks. 62-62, opposed portions of disks 6262 and 64-64 being disposed in side abutting relation to one another.

Andnow more particularly with regard to roller 32, this roller comprises a central shaft 66 having an end portion overhanging the associated bearing 38 and mounting a chain sprocket 39 and a spur gear 4| as already described. In addition,

the opposite end portions of shaft 66 fixedly 1nount respectively a chain sprocket 6'! and a handwheel 66, the former being disposed adjacent chain sprocket 39 and the latter being disposed in outer adjacent relation to bearing 36 on the left side of the machine.

Between the floor level and the upper work- .ing level of the frame structure 20 is an intermediate level mounting a gluing device toward the rear of the machine. The gluing device comprises a gluing roller 69 disposed transversely relative to the longitudinal axis of the machine and having opposite end portions journalled in bearings TI'II secured to the frame structure 20. Disposed in parallel rearward adjacent relation to gluing roller 69 is a presser roller I2, which is spring pressed against roller 59. Opposed end portions of rollers 69 and I2 respectively mount meshing spur gears 13 and "I4, spur gear I3 also being disposed to mesh with a spur gear 16 secured to a chain sprocket H for rotation therewith on a fixed stub shaft 18.

The roller devices 2I to 26 and the gluing de- ,tudinal axis of the machine.

, tatable about vertical axes.

vice comprising gluing roller 99 and presser roller 12 are driven in suitably timed relation respectively by endless chains I6 and BI. The endless chain I9 is trained over chain sprocket 6'! and a chain sprocket 82, the latter being mounted on a main drive shaft 83, and the endless chain 8! is trained over chain sprocket I1 and a chain sprocket 84, the latter also being mounted on main drive shaft 83, which is driven by a motor through an endless belt drive 61.

On the intermediate level of frame structure 20 and at the rear of the machine is a binding tape reel 88 suitably mounted for rotation about an axis disposed transversely relative to the longi- Just above the intermediate level of frame structure 26 and between reel 88 and presser roller I2 is mounted an idler roller 89 disposed transversely relative to the longitudinal axis of the machine. Another idler roller BI is similarly mounted at the front of the machine about midway between the'upper and intermediate levels of frame structure 21!. And still another such roller 92 is similarly mounted on the upper level of frame structure 29 between roller'devices 22 and 23. Just above the intermediate level of frame structure 26 and between reel 88 and idler roller 89 is a crossbar 93 disposed transversely relative to the longitudinal axis of the machine. Another crossbar 94 is similarly mounted in the proximity of presser roller '52 in rearward spaced relation thereto. Other crossbars 96 and 9'! are disposed in the proximity of gluing roller 69, the former being positioned in close adjacent relation thereto and the latter being positioned in forward spaced relation thereto. And still another crossbar 98 is disposed on the upper level of frame structure 20 between idler roller 92 and roller device 22.

Carried on the upper level of frame structure 2%) between roller devices 24 and 25 is a frame 99 mounting a lower guide-bar I6I extending parallel to the longitudinal axis of themachine, and also mounting on eachside of the guide bar IIlI a set of grooved fold over rollers I02 which are ro- An upper guide bar I03 is supported from a bar I04 carried by roller devices 24 and 25 and is disposed thereby in spaced superimposed parallel relation thereto.

Projecting forwardly from the upper level of the frame structure and overhanging the front end thereof is a work feed table I96, and between roller devices 2| and 22 is a guide plate It! disposed horizontally at about the same level as work feed table I96 and rollers 21 and 28. Supported from roller device 22 in suitable manner is a guide member I68 provided with a horizontally extending leg disposed in superimposed spaced relation to guide roller 28 and having opposite end portions overhanging roller 28, the rear end portion thereof being disposed over the forward end portion of guide plate I91. At the rear end of the machine a rearwardly nd downwardly inclined work receiving table H0 is supported from the frame structure 2|), the forward end portion thereof being positioned over reel 86 and the rear end portion being positioned under roller device 26.

On the upper level of frame structure 25 and between roller devices 25 and 26 is a cut off mechanism comprising a frame I09, a knife assembly III and control means II2 for the knife. The frame I 69 comprises bars H3 and H4 and a pair of similar posts IIBII5 all secured together to form a rigid open frame disposed transversely relative to the longitudinal axis of the .machine and in an upright position, bar I I3 having opposite end portions thereof rigidly secured to opposed side portions of frame structure 20 and bar II4 being supported in parallel vertically spaced relation thereto by posts I IS, the latter being disposed in parallel horizontally spaced relation to one another. In addition, spaced portions of bar I13 between posts II6I I3 have a pair of openings formed therein and a pair of tubular sleeves II1-II1 terminally rigidly secured thereto over the openings, as by welding, the axes of the openings and of tubular sleeves I I I1-I I! being disposed in parallel vertical relation to one another. Rigidly secured to bar I I3 in a suitable manner are additional bars I I 8 and I I9 and plates I2! and I22, all being disposed in side abutting relation to one another and having flush top surfaces, the plate I22 being curved downwardly as best shown in Figure 9. Disposed in a rvertical plane parallel to the longitudinal axis of the machine and positioned immediately in advance of the frame I03. is a, mounting plate I23 depending from bar I I4, the upper end portion of mounting plate I23 being rigidly secured to an intermediate portion of bar II 4, in a suitable manner and the lower end portion thereof being disposed just above plate I22.

Within the'opening of frame I09 is a crosshead bar I24 having opposite end portions thereof connected to opposite end portions of bar II4 by means of tension springs I2S-I 23, and having a knife I21 secured thereto by bolts I23. Terminally rigidly secured to opposite end portions of crosshead bar I24 and positioned thereby to depend therefrom in parallel relation to one another are a pair of plunger rods I29-I 29 extending downward through tubular sleeves 'II1--I I1 and the associated openings in bar H3.

The control means I I2 for the knife comprises a pair of similar electro-magnetic solenoid units I3II3I and a pair of electric switches I32-I33 all included in suitable electric circuit, the electric switches" I32-I33 being actuated respectively by a pair of levers I34'.I3B. The units -I3I--I3I. are rigidly secured to the underside of bar I I3 by supporting frames I3'II31 and are disposed thereby to suitably receive the lower end portions of plunger rods I29-I29. The electric switches I32-I33 are mounted in close adjacent relation to one another on the right side of an intermediate portion of mounting plat I23, and depending therefrom respectively are elongated flexible members I38--I39 havinglowerend por tions mounting respectively rollers I4I--I42. An

' I41 forming a sharp shoulder. Mounted on the reduced endportion- I41 for pivotal movement about a horizontal axis are levers" I34-' I36 having respectively arms Hit-I43 extending upwardly from reduced end portion I41, and also having respectively arms I5II52 extending downwardly and rearwardly from reduced end portion I41. Lever I49 is positioned againstithe sharp shoulder-formed by reduced end portion I41 and is disposed thereby to extend upwardly along the right side of mounting plate I23 in spaced relation thereto for engagement with roller I4I of electric switch I32, and lever I48 is positioned alongside lever I49 and extends upwardly for engagement with roller I42 of electric switch I33, the upper extremity of arm I48 being offset to this end from the remainder of lever I48, and levers I la-439 being secured on reduced end portion I41 by a washer I53 and a cotter pin I54. Disposed to extend vertically over the forward end portion of lever I43 is an adjusting screw I56 suitably mounted on plate I23 for relative vertical movement, the lower end portion of adjusting screw I 53 being disposed to abutthe aforementioned rear end portion. On the right side of mounting plate I23 and disposed in side abutting relation to the lower end portion thereof is a hold down foot I51 having a vertically extending leg portion I58 and a foot portion I59 extending rearwardly therefrom alongside arm I52 of lever I36. The leg portion I58 is provided with a vertically extending slot Itl and is secured to plate I23 b studs ISL-I32, and the foot pgrtion I59 is provided with a curved bottom edge I 3.

A suitable electric circuit for control of the cut off mechinism is shown in Figure 17 wherein switcl'ies I 32-533 are connected in series and electric-magnetic solenoid units I3I--I3I connected in parallel.

The binding tape I .54 from reel 83 is passed generally horizontally from the rear to the front of the machine over crossbar 93 and idler roller 89, under crossbar 94, between gluing roller 69 and respectively presser roller 12 and crossbar 93, over crossbar 91v and under idler roller 9I. From the latter, tape I64 extends upwardly and rearwardly to the upperlevel of frame structure 28 where it is passed under crossbar 93 and over idler roller 92. From roller 92, tape IE4 is passed horizontally toward the rear of the machine between the rollers of roller devices 23 and 24, between guide bars NI -I93 and successive pairs of fold over rollers Hi2, and between the rollers of roller device 25. From roller device 25 the tape is passed over bars Ii8II9 and plates I2EI22 and under knife I21, arms I5I-I52 are of levers I3ii33,-and foot portion I59 of hold down foot I52. And finally, the tape is passed through the rollers of the roller device 26.

In the operation of the machine the tape I64 is fed from the reel 88 along the path just outlined, and in this connection it will be noted that the gluing roller I52 has an external surface which is constantly kept moist with glue from a glue pot I33 disposed directly there under, the glue being applied to one side of the tape as the latter passes over the gluing roller 89. The operator stands at the front of the machine and feeds similar unbound strips of cardboard It'i from work feed table I33 into roller device 2! from whence they pass between guide plate I91 and guide member I33 and between the latter and roller 23 onto the glued top surface of tape 434 for movement therewith toward the rear of the machine. Roller device 23 presses the cardboard strips I31 down onthe'glued tape IE4, roller device 23 and fold over rollers I 82 fold the tape around the strips 26? and roller device 25 presses the folded'edges of the tape down on the strips I61. e

With regard to the spacing of the strips I61 on the tape I54, the strips are fed from the work feed table I08 into rollers. 21 and 44 directly 7 under collar 53. Since the strips I61 are wider than collar 53, opposite side portions thereof are engaged by rollers. 21 and 44, which rotate in opposite directions, as indicated by the arrows in Figure 8, to feed the strips I61 therethrough. As a strip I61 moves away from roller device 2|, it leaves collar 53 free to rotate with roller 44, and the then depending spacing element 54 makes roughly three quarters of a revolution before the concave portion of its reversely curved surface 51 strikes the upper surface of another strip I61 which, in the meantime, has been started through rollers 21 and 44, and which prevents collar 53 from rotating further with roller 44. While the strip I61 is being fed through rollers 21 and 4d the spacing element 5-:- rides on the upper surface thereof, and as the trailing end portion of the strip passes under the spacing element 54, thus freeing collar 53 for rotation with roller 44, the spacing element 54 swings downwardly so that the convex portion of the reversely curved surface 51 at the base of spacing element 54 is disposed in abutting relation to the aforementioned trailing end portion of the strip. Before the spacing element 54 swings downwardly as just mentioned, the leading end portion of another strip I31 is placed over the trailing end portion of the one already being fed through rollers 21 and 44 and is manually pushed to the position shown in Figure 18. As the trailing end portion of the strip I51 already being fed through rollers 21 and 44 leaves work feed table I 03 and passes under the spacing element 54, the position of the parts is as shown in Figure 3. It will readily be understood that in swinging downwardly from the position shown in Figure 3, the spacing element 54 acts to space the trailing end portion of one strip m1 from the leading end portion of the next strip H51 a distance equal to the thickness of the spacing element 54 at its base. The operator need only push the latter strip I61 along until it is gripped by the rollers 21 and 44; the spacing between the strips I 61 will not depend upon his judgment, but only on the thickness of the spacing element 54 at its base.

When the bound strips of cardboard reach the cut off mechanism the condition of the work is as shown in Figures l4, l5 and 16, and it only remains to sever the tape between the cardboard strips. As the work approaches the knife I21 it is held down by foot I51, which is vertically adjustable through slotted opening I6! engaged by studs I62-I62, the lower edge I63 of foot I51 being disposed to engage the upper surface of the cardboard strips. It will be seen that the lower extremities of arms I5Il52 of levers I34-i36, respectively, are disposed slightly in advance of knife I21, and that the lower extrem ity of arms I5l is disposed about midway between the lower extremity of arm I52 and knife I21. It will also be seen that the arms I48I49 of levers I34--I35 are respectively pressed rearwardly through the action of flexible members I32-433, and that levers I34-I33 may be adjusted bodily vertically by manipulating adjusting screw I53.

In the position of the parts shown in Figure 10, hold down foot I51 is engaged with the trailing end portion of one strip of cardboard and the leading end portion of another. Arms I5I--I52 are both engaged with the upper surface of the aforementioned trailing end portion and arms I48I49 are disposed to incline forwardly. When these arms are thus inclined,

8 electric switch I32 is open and electric switch I33 is closed. Consequently, as a glance at Figure 17 shows, the electro-magnetic solenoid units I 3I-I3I are de-energized, knife I21 being disposed in raised position.

As the work moves from the position of Figure 10 to that of Figure 11, arm I52 drops from the upper surface of the aforementioned trailing end portion to the upper surface of the tape, and the arm I49 assumes a vertical position, which opens electric switch I33. Since electric switches I32--I33 are both open, the electromagnetic solenoid units are de-energized and knife I21 is still raised.

As the work moves from the position of Figure 11 to that of Figure 12, the arm I5I drops from the upper surface of the aforementioned trailing end portion to the upper surface of the tape, and the arm I48 assumes a vertical position, which closes electric switch I32. Since electric switch I32 is now closed and electric switch I33 is open the electro-magnetic solenoid units I3I--I3I are de-energized and knife I21 is still raised.

As the work moves from the position of Figure 12 to that of Figure 13, the arm I52 is raised to engage the upper surface of the aforementioned leading end portion, and the arm I49 is again disposed to incline forwardly, closing electric switch I33; Since electric switches I32-I33 are now both closed, the electro-magnetic units I3II3I are energized and act to draw the plunger rods I29 downward against the force of springs I2'6I26. Of course, the plunger rods carry the crosshead bar I24 and the knife I21 downward, and the latter acts to sever the tape between the cardboard strips, the completed work being moved along by rollers 3243 and delivered to work receiving table I I B.

As the work moves along from the position of Figure 13 to that of Figure 10, the arm I5! is raised to engage the upper surface of the aforementioned leading end portion, and the arm I48 again assumes a forwardly inclined position, opening electric'switch I32. Since electric switch I32 is now open and electric switch I33 is closed, the electro-magnetic solenoid units I3I-I3'I are de-energized and the knife I21 is raised again by the action of springs I 26-4 26.

It will be noted that the electro-magnetic solenoid units I3I--I3I are energized during the period of time that arm I52 islifted by the leading end of the strip I61, while arm I5I remains lowered in engagement with the relatively thin tape portion extending between adjoining cardboard strips, this being one of the important factors to be considered in timing the machine for proper operation. Other such factors are the time it takes for the knife to move from its raised to its cutting position, the rate of feed through the machine, and the spacing between the cardboard strips. All the factors controlling the timing may be correlated so that the knife will be lowered to cut the tape between the cardboard strips at a predetermined distance from the leading end portion of the cardboard strip approaching knife I21.

It should be apparent now that a machine for edging card-board strips has been provided with automatic means independent of the operator: judgment for relatively spacing strips of cardboard along a continuous binding tape as the cardboard strips are fed into the machine for binding. And it should be apparent that such a machine has been provided with means for severing the tape between the strips of cardboard, and that the means provided is operative independently of the length of the stripsfed through the machine, and is also operative board strips, certain features are of more general application and, therefore, it is not intended to limit the invention to the exact construction and combination herein shown and described for purposes of illustration as various modifications within the scope of the appended claims may occur to persons skilled in the art.

What is claimed as new and useful is:

' 1. In a machine for edging cardboard strips with a binding tape, said machine comprising a supporting frame structure, means on said frame structure for feedin a continuous strip of said binding tape along a predetermined path in one direction at a predetermined rate, and means on said frame for successively feeding said cardboard strips into the path of said tape at said predetermined rate and positioning said cardboard strips along said tape in predetermined spaced relation to one another for movement therewith in the same direction, said last mentioned means comprising a pair of roller elements carried by said frame structure and mounted for rotation about parallel axes in opposite directions for engaging the oppositely facing surfaces of a portion of said cardboard strips to feed said cardboard strips therethrough, and a separator element extending generally radially from the axis of one of said roller elements and beyond the periphery thereof, said separator element being positionable between the opposed end portions of successive leading and trailing cardboard strips, and said separator element being mounted for rotation with the associated one of said roller elements through frictional contact therewith, being thus rotated from said position between the opposed end portions of said leading cardboard strip when released from said re-' straint for separating the latter from the next succeeding cardboard strip, and means for cutting said tape between said cardboard strips.

with a binding tape, said machine comprising a supporting frame structure, means on said frame structure for feeding acontinuous strip of said binding tape along a predetermined path in one direction at a predetermined rate, and means on said frame for successively feeding said cardboard strips into the path of said tape at said predetermined rate and positioning said cardboard strips along said tape in predetermined spaced relation to one another for movement therewith in the same direction, said last mentioned means comprising a .pair of elongated rollers mounted on said frame structure for rotation about parallel axes in opposite directions,

said rollers having opposedreduced portions intermediate the ends thereof, the opposed shoulders of said'rollers formed by said reduced portionsbeing disposed to engage opposed side porin the construction of machines for edging card- 2. In a machine for edging cardboard strips tionsof said cardboard strips to feed said cardboard strips through said rollers, a collar relatively rotatably mounted on the reduced portion of one of said rollers, and a separator element carried by said collar and extending generally radially therefrom beyond the periphery of the associated roller, said separator element being positionable between the opposed end portions of successive leading and trailing cardboard strips, said collar being mounted for rotation with said associated roller through frictional contact therewith, and said separator element being thus rotated from said position between the opposed end portions of said leading and trailing cardboard strips to a position wherein said separator element rests upon an intermediate portion of said trailing cardboard strip whereby said separator element is restrained fromfurther rotation with said associated roller and held in readiness to' follow said trailing cardboard strip when released from said restraint for separating the latter from i the next succeeding cardboard strip, and means for cutting said tape between said cardboard strips.

3. In a machine for edging cardboard strips' therewith in the same direction, said last men-' tioned means comprising a pair of elongated rollers mounted one above the other on said frame structure for rotation about horizontal parallel axes in opposite directions, said rollers having opposed reduced portions intermediate the ends thereof, the opposed shoulders of said rollers formed by said reduced portions being disposed to engage opposed side portions of said cardboard strips to feed said cardboard strips through said rollers, a collar relatively rotatably' mounted on said reduced portion of the upper roller, the oppositely facing side surfaces thereof being disposed in frictional contact with the' shoulders formed by said reduced portion of the upper roller, and a separator element carried by said collar and extending generally radially therefrom, said separator element having a pair of oppositely facing side surfaces disposed in inwaroly spaced relation to the shoulders formed by said reduced portion of the lower roller, and

having a second pair of oppositely facing surfaces converging outwardly to an end portion' disposed to clear said reduced portion of the lower roller, said separator element being positionable between the opposed end portions of successive leading and trailing cardboard strips,

said collar being mounted for rotation with said upper roller through said frictional contact therewith, and said separator element being thus rotated from said position between the opposed end portions of said leading and trailing cardboard strips to a position wherein said separator element engages the upper surface of said trailnext succeeding cardboard strip, and means for cutting said tape between said cardboard strips.

4. In a machine for edging cardboard strips with a binding tape, said machine comprising a supporting frame structure, means on said frame structure for feeding a continuous strip of said binding tape along a predetermined path in one direction at a predetermined rate, means on-said frame for successively feeding said cardboard strips into the path of said tape at said predetermined rate and positioning said cardboard strips along said tape in predetermined spaced relation to one another for movement therewith in the same direction, and means for cutting said tape comprising a knife mounted on said frame structure and movable for cutting said tape, a pair of arms disposed to engage spaced portions along said tape and cardboard strips, each arm being movable independently of the other between one position wherein it directly engages a cardboard strip and another position wherein it directly engages the tape between two successive cardboard strips, said arms successively assuming a plurality of different rel ative positions as said tape and cardboard strips pass thereby in contact therewith, and said knife being actuated in response to one of said different relative positions of the arms for cutting said tape between said cardboard strips.

5, In a machine for edging cardboard strips with a binding tape, said machine comprising a supporting frame structure, means on said frame structure for feeding a continuous strip of said binding tape along a predetermined path in one direction at a predetermined rate, means on said frame for successively feeding said cardboard strips into the path of said tape at said predetermined rate and positioning said cardboard strips along said tape in predetermined spaced relation to one another for movement therewith in the same direction, and means for cutting said tape comprising a knife mounted on said frame structure and movable for cutting said tape, a pair of arms disposed to engage spaced portions along said tape and cardboard strips, each arm being movable independently of the other between one position wherein it directly engages a cardboard strip and another position wherein it directly engages the tape between two successive cardboard strips, said arms successively assummg a plurality of different relative positions as said tape and cardboard strips pass thereby in contact therewith, a pair of electric switches each arranged to close and open independently of the other in response to the movement of one of said arms,'both of said electric switches being closed when said arms assume one of said differ. ent relative'positions and either or both being open when said arms are in any other one of said different relative positions, and electro-magnetic solenoid means connected in electric circuit with said electric switches, the last mentioned means being energized when both of said electric switches are closed, and said knife being actuated thereby for cutting said tape between said cardboard strips.

6. In a machine for edging cardboard "strips with a binding tape, said machine comprising a supporting frame structure, means on said frame structure for feeding a continuous strip of said binding tape along a predetermined path in one direction at a predetermined rate, means on said frame for successively feeding said cardboard strips into the path of said tape at said predetermined rate and positioning said cardboard strips along said tape in predetermined spacedlevers about a horizontal axis, said levers being disposed thereby above said tape and in longi-' tudinally spaced relation to said knife, and each of said levers comprising an upright'arm and an angularly related lower arm extending down- Ward and toward said knife from said intermediate portion, the terminal portions of said lower arms being relatively longitudinally spaced and disposed to engage spaced portions along said tape and'cardbord strips, each of said levers being movable independently of the other between one position wherein said terminal portion of the associated lower arm directly engages a cardboard strip and another position wherein said terminal portion directly engages the tape between two successive cardboard strips, said levers successively assuming a plurality of different relative positions as said tape and cardboard strips pass thereunder in contact therewith, a pair of electric switches each arranged to close and open independently of the other in response to the movement of one of said upright arms of the levers, both of said electric switches being closed when said levers assume one of said different relative positions and either or both being open when said levers are in any other one of said different relative positions, and electro-magnetic solenoid means connected in electric circuit with said electric switches, the last mentioned means being energized when both of said electric switches are closed, and said knife being actuated thereby for cutting said tape between said cardboard strips.

'7. A device for cutting a continuous tape between cardboard strips carried thereby in spaced relation to one another, a supporting frame structure, a knife mounted on said frame structure and movable for cutting said tape, a pair of arms disposed to engage spaced portions along said tape and cardboard strips, each arm being movable independently of the other between one position wherein it directly engages a cardboard strip and another position wherein it directly engages the tape'between two successive cardboard strips, said arms successively-assuming a plurality of different relative positions as said tape and cardboard strips pass thereby in contact therewith, a pair of electric switches each arranged to close and open independently of the other in response to the movement of one of said arms, both of said electric switches being closed when said arms assume one of said different relative positions and either or both being open when said arms are in any other one of said different relative positions, and electro-magnetic solenoid means connected in electric circuit with said electric switches, the last mentioned means being energized when both of said electric switches-are closed, and said knife being actuated thereby for cutting said tape between said cardboard strips.

8. A device for-cutting a continuous tape between cardboard strips carried thereby in spaced relation to one another, a supporting frame structure, .a knife yieldably suspended from said frame structure and disposed thereby over said tape, a pair :of elongated levers having inter- 13 mediate portions pivotally connected to said frame structure for swinging movement of said levers about a horizontal axis, said levers being disposed thereby above said tape and in longitudinally spaced relation to said knife, and each of said levers comprising an upright arm and an angularly related lower arm extending downward and toward said knife from said intermediate portion, the terminal portions of said lower arms being relatively longitudinally spaced and disposed to engage spaced portions along said tape and cardboard strips, each of said levers being movable independently of the other between one position wherein said terminal portion of the associated lower arm directly engages a cardboard strip and another position wherein said terminal portion directly engages the tape' between two successive cardboard strips, said levers successively assuming a plurality of different relative positions as said tape and cardboard strips pass thereunder in contact therewith, a pair of electric switches each arranged to close and open independently of the other in response to the movement of one of said upright arms of the levers, both of said electric switches being closed when said levers assume one of said different relative positions and either or both being open when said levers are in any other one of said different relative positions, and electro-magnetic solenoid means connected in elecdifferent relative positions as said tape and cardboard strips pass thereby in contact therewith, a pair of electric switches each arranged to close and open independently of the other in response to the movement of one of said arms, both of said electric switches being closed when said arms assume one of said different relative positions and either or both being open when said arms in any other one of said difierent relative positions, and electro-magnetic solenoid means connected in electric circuit with said electric switches, the last mentioned means being energized when both of said electric switches are closed, and said knife being actuated thereby for cutting said tape between said cardboard strips.

10. A device for cutting a continuous tape between cardboard strip-s carried thereby in spaced relation to one another, a knife movable tric circuit with said electric switches, the last mentioned means being energized when both of said electric switches are closed, and said knife being actuated thereby for cutting said tape between said cardboard strips.

9. In a machine for edging cardboard strips with a binding tape, said machine comprising means for feeding a continuous strip of said binding tape along a predetermined path in one direction at a predetermined rate, means for successively feeding said cardboard strips into the path of said tape at said predetermined rate and positioning said cardboard strips along said tape in predetermined spaced relation to one another for movement therewith in the same direction, and means for cutting said tape comprising a knife, a pair of arms disposed to engage spaced portions along said tape and cardboard strips, each arm being movable independently of the other between one position wherein it directly engages a cardboard strip and another position wherein it directly engages the tape between two successive cardboard strips, said arms successively assuming a plurality of for cutting said tape, a pair of arms disposed to engage spaced portions along said tape and cardboard strips, each arm being movable independently of the other between one position wherein it directly engages a cardboard strip and another position wherein it directly engages the tape between two successive cardboard strips, said arms successively assuming a plurality of diiferent relative positions as said tape and cardboard strips pass thereby in contact therewith, a pair of electric switches each arranged to close and open independently of the other in response to the movement of one of said arms, both of said electric switches being closed when said arms assume one of said different relative positions and either or both being open when said arms are in any other one of said different relative positions, and electromagnetic solenoid means connected in electric circuit with said electric switches, the last mentioned means being energized when both of said electric switches are closed, and said knife being actuated thereby for cutting said tape between said cardboard strips.

HARRY KELLER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,220,623 Gardner Mar. 27, 1917 1,293,348 Kane et a1 Mar. 25, 1919 1,958,132 Davis May 8, 1934 1,958,138 Fowler et a1 May 8, 1934 2,166,038 Chambon July 11, 1939 2,254,394 Ratley Sept. 2, 1941