US2058036A

US2058036A - Wrapping machine

Info

Publication number: US2058036A
Application number: US17018A
Authority: US
Inventors: Ernest G Rider; Walter T Bailey
Original assignee: Stokes and Smith Co
Current assignee: Stokes and Smith Co
Priority date: 1935-04-18
Filing date: 1935-04-18
Publication date: 1936-10-20
Anticipated expiration: 1953-10-20

Description

Oct.2,1936. 'E. G. RID ER ET A1. aossma WRAPPING MACHINE Filed April 18, 1935 5 Sheets-Sheet 1 INVENTORS ATTORNEY.

E. G. RIDER ET AL 2,058,U36

WRAPP ING MACH INE Get. 20, 1936.

Filed April 18, 1935 5 Sheets-Sheet 2 (2 v )INVENTORS" BY I M Q. 69%,;

ATTORNEY.

Oct. 20, 1936. E, RlDER T AL 2,058,036

WRAPPING MACHINE Filed April 18, 1955 5 Sheets-Sheet 3 INVENTORS 1a /9 65% MM BY M LAM {L4 a. 40;

ATTORNEY.

Oct-20, 193. Efi E L 2,058,0326

WRAPPING MACHINE Filed April 18; 1955 5 Sheets-$11991; 4

ATTORNEY.

Oct.'20, 1936. I E. G. RIDE ET AL 2,053,035

WRAPP ING MACHINE Filed Apfil 18, 1935 5 Sheets-Sheet 5 ATTORNEY.

Patented Oct. 20, 1936 PATENT OFFICE WRAPPING MACHINE Ernest G. Rider and Walter T. Bailey, Philadelphia, Pa., assignors to Stokes and Smith Company, Summerdale, Philadelphia, Pa., a corporation of Pennsylvania Application April 18, 1935, Serial No. 17,018

34 Claims.

Our invention relates to wrapping machines for applying wrappers, labels, or the like, generically termed wrappers, to stayed or unstayed boxes, box covers, cartons and the like, generi- 5 cally termed boxes.

In accordance with one aspect of our invention, the operation of folding the corner flaps of the side panels of a wrapper to engage with the end walls of a box on the form .block of a wrapping 10 machine is performed by improved folding mechanism which does not require the form block to pause during this folding operation; more particularly, the folding tools are pivoted on fixed axes and are rotated in the path of the form block I l5 at proper time to effect folding of the corner flaps, and to follow the form block during the operation; specifically, in one form of our invention, folding tools operating upon opposite sides of the box are actuated by a common cam in 2 timed relation to movement'of the box form.

Our invention further resides in the features of construction, combination and arrangement thereafter described and claimed.

For an understanding of our inventionand for illustration of preferred forms thereof, refer- .ence is to be had to the accompanying drawings in which:

Figure 1 .is a front elevational View, with parts omitted andparts in section, of a box wrapping :machine;

Figure 2 is a side elevational view, with parts omitted and parts in section, of 'Fig. 1;

Fig. .3 is a plan view of parts appearing in Fig. 2; 5 Fig. 4 is a sideelevational view, on enlarged scale and with parts-in section, of one of .the tool slides-of Fig. '1;

Fig. 14a. is a detail view showing mechanism of Fig. 4 in a diiferentoperating position; .140 -Fig.'5 isa detail view of a modified form of wrapping tool;

Fig. 6 is a plan view of Fig. 5; Fig. 7 is a plan view of Fig. 4, with parts in section and parts omitted; 45 Fig. Bisa detail view showing a modified form -..of folding mechanism;

Fig. 9 is a plan view of Fig. 8; Fig. 10illustratesthe parts of Fig. 8 in different operating positions; .50 Fig. llis asideelevational view with parts in section o-fanother type of tool slide.

The wrapping machine shown in Figs. 1 and 2 is, in general, similar-to that shown in .Smith Patent No.-"691;3-29. The form block F for car- 555 rying-a box and wrapping assembly into operative shown, to the position shown in Fig. 1. For continued downward movement of the form block, 9 the rolls 6, 6a wipe the side panels of the wrapper into engagement with the side walls of the box. As indicated by Fig. 2 the action of the rolls may be supplemented by the brushes I, la. As the form block continues its downward move- 5 ment, the

tools

8, 8a fold the flaps at .the ends of the side panels of the wrapper around the corners of the box into engagement with the box ends; subsequently, the rolls 9, 9a, Fig. 1, wipe the end panels of the wrapper into engagement with the end walls of the box and the turned-in flap of the wrapper side panels. The form block continues its movement until the upper part UF thereof is slightly above the marginal turn-in tools I0, I Do, I 0b, and I00. The upper part UP of the block is then stopped under the control of the cam groove H of cam I while the middle part MF continues downward until the upper edge of the box is slightly below the turn-in tools, whereupon the groove l2 of cam l temporarily ,30 stops movement of the box. The turn-in tools I0l0c then move to turn in the portions of the wrapper extending above the edge of the box. The upper portion UF of the form block is then allowed to descend and when the tools .lfl-lllc 3 5 are withdrawn, the upper portion of the form block folds the marginal portions of the wrapper into engagement with the inside of the box. The pressing tools l3-l3c then move inwardly to press the sides of the box against the sides of $0 the form block to insure a good-bond between a box and the marginal turned-in portions or the wrapper.

As appears from Figs. 1 and 2,.the variouswrapping tools are carried by the four slides ES, ESI,

,SS, and SSI, which are adjustably secured to the under side of the table [4 of the wrapping machine. Specifically, the slides are received by grooves in the underside of the table and are supported by the gibs 15, Fig. 1. For difierent sizes of boxes, difierent sizes of form blocks and ,platensare used; and'to accommodate themachine for wrapping different sizes of boxes, the

slides are adjustable toward and from the path of theiorm block. 7 i

The internal construction and operating mechanism for the side slide SS is shown in Fig. 4. The construction of the opposite slide SS! is identical and is, therefore, not separately shown. The slide is made in two halves, as shown in Fig. '7, which are clamped together to provide a housing I6 in which most of the operating mechanism is disposed. The vertically reciprocable member I1 is adjustably secured as by clamping screw l8 to the bar I9 extending radially from the member 20 which is slidable upon the fixed cylinder 2| which receives the plunger 22 for supporting platen P. The reciprocable member 29 is connected by link 22a to lever 23 pivoted at 24 to the bracket 25 fastened to the framework of the machine. The other end of lever 23 carries a cam follower 26 which is received by the cam groove 21 of the cam 28 which is secured to shaft 2. Accordingly, as shaft 2 rotates to effect reciprocation of the form block of the wrapping machine, the member I! of the tool slides SS and SSI operates in predetermined time relation thereto. The end slides ES and ESI are also each provided with a reciprocable member I! similarly operable from cam 28.

Reverting to Fig. 4, the upper end of the member ll carries a pin extending through the slot 29 in a link 30 pivotally connected to one arm of the bell-crank lever 3| which is pivoted at 32 to a bracket 33 of the tool slide. The other arm 34 of the bell-crank lever is connected by link 35 to the slidable frame 36 which carries the roll 6 and brush 1. As shown in Figs. 3 and 4, the slide is guided for reciprocation toward and from the path of the form block by the guide members 31 which receive the rods 38 of the frame 36. The groove of cam 28 is so shaped that the roll 6 and brush 1 are moved inwardly prior to descent of the form block from the position shown in Fig. 1 to apply a wrapper side panel, as above described, and are retracted as the form block moves upwardly toward the position of Fig. 1.

The member I! is provided with a cut-out portion or slot in which a gear 39 is disposed. The pin 40, secured to the sides of member I], provides the support for the gear 39. As shown in Fig. 4, on one side of its axis the gear 39 is in mesh with the stationary rack 4| and on the other side of its axis is in mesh with the rack 42 secured to or integral with the slidable member 43. Accordingly, as the member I! is reciprocated the slidable member 42 is reciprocated to greater extent since the rack and gear arrangement described provides a motion-multiplying connection. The cam groove 44 in one face of the reciprocable member 43 engages the cam follower 45 at one end of the bell-crank lever 46 pivotally mounted on a stub shaft secured to one side of the slide. The other arm of the bellcrank lever 46 is connected by link 41 to the slidable member 48 which carries the frame 49 for the presser block l3. Preferably, and as shown, the presser block is not rigidly secured to the frame 49 but is capable of relative motion. The spring 50 biases the presser block to the position shown in Fig. 4 and permits it to yield when moved into engagement with a box to effect the pressing operation above described.

As shown in Fig. 7, the frame 49 for the presser block is guided for reciprocating movement by the rods 5| which extend therefrom into the guide members 52 carried by the main frame of the slide.

The opposite face of the slidable cam member 43 is provided with the cam groove 53 which receives the cam follower 54 carried by one arm of the bell-crank lever 55 whose other arm is con-- nected by link 56 to the slidable member 5? which carries a pin 58 extending through a slot 59 in the frame 60 for the marginal turn-in tool In. The spring 6| biases the frame 60 to the position shown in Fig. 4. The frame 60, as more clearly shown in Fig. '7, is guided for movement toward and from the path of the form block by the rods 62 which is received by the guide members 63 on the main frame of the slide unit.

The mechanism for operating the marginal turn-in tools and presser blocks of the end slides ES and ES! is substantially the same as that shown in Fig. 4. The arrangement for operating the end rolls 9 and 9a, as clearly appears in Fig. 1, is generally the same as that for operating the side rolls 6, 6a, the principal difference being that the brackets 33 of the end slides are substantially lower since the rolls 9 and 9a are much closer to the marginal turn-in tools than are rolls 6 and 6a of the side slides. Corresponding elements of the operating mechanism for the side slides have been identified by the same reference characters with suitable subscripts.

Referring to Fig. 4, the side slides carry the

folding tools

8, 8a for folding the end flaps WE' into engagement with the box ends BE. Each of the side slides SS, SSI is provided with a bracket 64 for supporting a shaft 65 to which the pairs of folding tools are secured. The relation between the corner-lap tools and the form block is clearly shown in the right half of Fig. 3. The arm 66 secured to shaft 65 is connected to the lever 61 which is pivoted to the frame of the slide by a yielding connection which permits the lever 61 to move after the abutment 66a: of arm 66 engages the adjustable stop 68 on bracket 33. More specifically, as shown in Fig. 4, to the arm 66 is pivotally connected the hollow member 69 which receives one end of rod 10 whose other end is pivoted to arm 66. A spring H between the collar 12 on rod 16 and the plug 13 of member 69 biases the parts to the position shown. When lever 61 is moved in counterclockwise direction, the tool 8 is swung in clockwise direction to meet the box and wrapper assembly; specifically, the tip of each of the corner lap tools 8 meets a corner flap of the wrapper adjacent its lower edge, shortly after the bottom of the box moves below rolls 6, 6a and moves downwardly with the form block until the lever 66 is arrested by stop 68. As the form block continues its movement the tools remain in this position. Thus, the end flaps of the wrapper side panels are wiped intimately into engagement with the box end. With the construction shown, the movement of the form block from the position shown in Fig. 1 to the position adjacent the marginal turning tools is continuous; there is no pause in the movement of the form block during the turning in of the wrapper end flaps by tools 8.

As it appears from Fig. 4, the wrapping tools may be pivotally mounted at the ends of arms 14 on shaft 65, the springs 15 permitting them to yield and afford wiping action during the flap folding operation.

The operating shaft for the lever 61 is connected through a universal joint with the shaft 16, whose other end is connected through a universal joint to shaft 11 supported by the bracket 18, secured to the main framework of the machine. Arm 19 secured to shaft TI is connected by link 80 to the lever 8| pivoted on the bracket 82 and whose arm 83 carries the cam follower 93 carried by the tool slide.

84 which is received by the groove 85 of cam 86 secured to shaft 2. The-arm fi'lmnot showmof the opposite slide unit SSl issimilarly connected to the lever 8|, the corresponding connecting element being identified by like reference characters with suitable subscripts.

The cam 86 is adjustably secured to the 'shaft 2 to accommodate the machine for wrapping boxes, of different sizes. As shown in Fig. 1, an index or pointer on-cam'86 may cooperate with a scale 81 calibrated for different box sizes. This adjustment is necessary, since whatever may be the depth of the box, the -form block'must stop when the box is positioned so that its upper edge is opposite the marginal turning tools l9'-I9c. Therefore, the time inthecycle of 'formblock movement at which the bottom of the box passes the folding tools 8,-8a is different for different sizes of boxes.

If desired, the folding tools,8,-8a may be provided withbrushes to effect the wiping action.

As shown in Figs. 5 and 6, the plate 81, to which is secured a row of bristles '88, isadapted to be attached to the wiping plate of a folding tool 8. Plate 81 may, as shown, be provided with holes 89 matching holes 90 in tool 8 to permit clamping bolts to be passed therethrough.

When the box blanks are unstayed, and particularly for making extension bottom boxes from unstayed blanks, it is desirable that the side walls of the box be supported or held against'the form block during the folding of the wrapper end flaps by the tools 3, 8a. As -shown in Figs. 8 to 10,- there may be associated with each of the folding tools 8 a side supporting tool 9| pivotally-mounted upon a block 92 which is adjustably secured to a bar The under surface of the member 9| is provided with a cam surface cooperating with an abutment 94 movable with a tool 8. When the tool 8 is in its retracted position, the side supporting tool- 9! is held by the pin 94 outof the path of the form block. As the tool 8 swings inwardly to perform the wiping operation, the side supportingtool 9| also moves inwardly, the pin 94 andthecam surface of the member 9| controlling the relative positions of the folding tool and the sidesupporting tool during this movement. When the side supporting tool 9| reaches the position shown in Fig. 10 in which it is holding the side wall of the box against the form block, the rear extension 95 thereof engages the shoulder 99 of the supporting bracket and its further movement isarrested. The wiping tool, however, as shownby Fig. 10, continues to move downwardly with the form'block and thus moves pin 94 out of engagement with the tool 9|. The side supporting tool moves the side wall of the box into proper position and insures intimate engagement of the wrapper with the box adjacent the corner. As the folding tool il 'returnsto its original position, the pin 94 again engages the supporting member 91 and returns it to the position shown in Fig. 8. For extension bottom work, the side roll 6, in accordance with the usual practice, is provided with acutout or groove and is spring-biased to the position shown in Fig. 8.

In Fig. l1,'there is illustrated the application of our new type of non-stop-corner lap construction to tool slides for wrapping machines of the type disclosed and claimed in Federwitz application Serial'No. 757,115, filed December 12, 1934, and generally of the type'shown in Nitsch et a1.-Patent No. 1,540,900. In this construction, the main camlaof the wrapping machine-is in the baseand 'drives shafts '91, individual to the slide units,one of which is shown. Shaft 91,

through gears 98, 99, drives the cam N19 to which cam 28a is adjustably secured. The lever llll which corresponds to lever 91, of the modifica- .tion:previously described, is provided with a cam follower I02 for the cam groove in cam 28a. The

principal difference between this modification the side slides is provided with a cam for operatingthe two corner lap tools of the slide, whereas, in the wrapping machine of Fig. 1, a single cam 86 controls the operation of both sets of corner lap tools. The corresponding elements have been identified by the same reference characters used in describing the construction and operation of'the modification of Figs l to 10.

While we have illustrated and described preferred arrangements, it is to-be understood our invention is not limited thereto, but is coextensive in scope with the appended claims.

7 What we claim is:

1. A wrapping machine comprising form block structurefor moving a box and a wrapper along a path, a corner-lap folding tool having a fixed axis of rotation adjacent said path, and means operating in timed relation to said'form block structure for actuating said tool to effect a cornerlap folding operation during movement of said form block structure.

2. A wrapping machine comprising form block structure for moving a box and wrapper along a path, corner-lap folding tools rotatable about axes-adjacent said path on opposite sides thereof, and a cam operating in timed relation to said form block structure for actuating said cornerlap tools duringmovement of said form block structure.

3. A wrapping machine comprising form block structure for moving a box and a wrapper along apath, a wrapper folding tool rotatable about an axis adjacent said path, a lever rocked about a second axis in-timed relation to movement of said form block structure, and a linearly yielding driving connection between said lever and said folding tool.

4. A wrapping machine comprising form block structure for moving a box and a wrapper along a path, wrapper folding tools rotatable about an axis adjacent said path, a lever rocked about a second axis in timed relation to movement of said form block structure, and a linearly-yielding driving connection between said lever and said foldingtools.

5. A wrapping machine comprising form block structure for moving a box and a Wrapper along a path, wrapper folding tools rotatable about axes on opposite sides of said path, levers rocked in timed relation to movement of said form block structure, means for connecting said lever to said tools respectively, and a common cam for operating said levers to effect folding operation by said tools during movement of said form block structure.

'6, A wrapping machine comprising form block structure for moving a box and a wrapper along a path, a tool slide adjustable toward and away from said path to accommodate different sizes of boxes, a rotatable folding tool carried by said slide, a lever carried by said slide and rocked during movement of said form block structure to effect a folding operation by said tool, and means connecting said lever to said folding tool.

"7. -A wrapping machinecomprising form block til) structure for moving a box and a Wrapper along a path, tool slides adjustable on opposite sides of said path to accommodate different sizes of boxes, rotatable folding tools carried by said slides respectively, a lever carried by each of said slides and rocked in timed relation to movement of said form block structure, and means conmeeting each of said levers to the folding tool carried by the associated slide.

8. A wrapping machine comprising form block structure for moving a box and a wrapper along a path, tool slides adjustable on opposite sides of said path to accommodate different sizes of boxes, rotatable folding tools carried by said slides respectively, and a common cam for operating said tools in timed relation to movement of said form block structure.

9. A wrapping machine comprising form block structure for moving a box and a wrapper along a path, wrapper folding tools rotatable about axes adjacent said path on opposite sides thereof, a cam operating in timed relation to said form block structure for actuating said folding tools, and means for adjusting the position of said cam to vary the time of operation of said folding tools.

10. A wrapping machine comprising form block structure for moving a box and a wrapper along a path, tool slides adjustable on opposite sides of said path to accommodate different sizes of boxes, rotatable folding tools carried by said slides respectively, a common cam for operating said tools in timed relation to movement of said form block structure, and means for adjusting the position of said cam to vary the time of operation of said folding tools for different sizes of boxes.

11. A wrapping machine comprising a folding tool for moving an end flap of a wrapper side panel around a corner of a box into engagement with an end of the box, and a tool for engaging the side of the box adjacent said corner, one of said tools having a cam surface controlling their relative positions.

12. A wrapping machine comprising a folding tool for moving an end flap of a wrapper side panel around a corner of a box into engagement with an end of the box, and a tool for engaging the side of the box adjacent said corner, said tools being pivotally mounted on different axes, and one of said tools having a cam surface controlling the relative positions of said tools.

13. A wrapping machine comprising a form block for moving a box and a wrapper along a path, a folding tool for moving an end of a wrapper side panel around a corner of the box into engagement with an end of the box, an abutment extending from said tool, and a tool for engaging the side of the box adjacent said corner having a cam surface cooperating with said abutment to control the movement of said second tool.

14. A wrapping machine comprising a form block for moving a box and a wrapper, a tool movable in an are substantially tangent to the path of movement of a side of said form block, a folding tool movable in a plane substantially coincident with the plane of movement of an end of said form block, and means for operating said second tool in timed relation to said form block to fold an end flap of a wrapper side panel into engagement with an end wall of the box, said tools having cooperating surfaces to control movement of said first tool.

15. A-wrapping machine comprising a form block for moving a box and wrapper along a path, a folding tool for effecting engagement of an end flap of a wrapper side panel with an end of the box, means for effecting operation of said tool in timed relation to said form block, a second tool biased to a position substantially tangent to the path of movement of a side of said form block, and means movable with said first tool controlling the movement of said second tool.

16. A wrapping machine comprising form block structure for moving a box and a wrapper along a path, a slide adjustable toward and away from said path to accommodate different sizes of boxes, a rotatable folding tool carried by said slide, a lever connected to said tool and pivotally mounted upon said slide, and cam for rocking said lever carried by said slide to effect angular movement of said tool.

1'7. A wrapping machine comprising form block structure for moving a box and a wrapper along a path, a slide adjustable toward and away from said path to accommodate different sizes of boxes, a rotatable folding tool carried by said slide, a lever connected to said tool and pivotally mounted on said slide, a cam carried by said slide for rocking said lever to effect angular movement of said tool, a shaft for operating said cam, and means for varying the angular relation between said shaft and said cam to vary the timing of said tool for boxes of different sizes.

18. A wrapping machine comprising form block structure for moving a box and a wrapper along a path, tool slides adjustable on opposite sides of said path to accommodate boxes of different sizes, rotatable folding tools carried by said slides respectively, operating levers for said tools pivotally mounted upon said slides, cams for rocking said levers carried by said slides, and common driving means for said cams.

19. In a box wrapping machine, a tool for performing a wrapping operation, and linearly oscillatable cam structure for effecting movement of said tool.

20. A box wrapping machine, comprising a form block for moving a box and a wrapper along a path, a tool movable toward and from said path to effect a wrapping operation, and linearly oscillatable cam structure for effecting movement of said tool and operating in timed relation to the movement of said form-block.

21. A box wrapping machine comprising a form block for moving a box and a wrapper along a path, tools disposed on opposite sides of said path movable toward and from said path, linearly oscillatable cams for operating said tools, and common operating means for effecting movement 01 said cams in timed relation to the movement of the form-block.

22. A box wrapping machine comprising a form block for moving a box and a wrapper along a path, a slide adjustable toward and away from said path, a wrapping tool carried by said slide, and a linearly oscillatable cam for operating said tool carried by said slide.

23. A box wrapping machine comprising a form block for moving a box and a wrapper along a path, a pluralityof wrapping tools movable toward and from said path, and linearly oscillatable cam structure for effecting operation of said tools operating in timed relation to the movement of said form-block structure.

24. A box wrapping machine comprising a form block for moving a box and a wrapper along a path, a slide adjustable toward and from said path, a plurality of wrapping tools carried by said slide, and linearly oscillatable cam structure for operating said tools carried by said slide.

25. A box wrapping machine comprising a form block for moving a box and a wrapper along a path, a wrapping tool movable toward and from said path, and means for operating said tool comprising a reciprocating member, a gear carried by said member, a stationary rack engaging said gear and a movable rack engaging said gear and connected to said tool.

26. A box wrapping machine comprising a form block for moving a box and a wrapper along a path, a wrapping tool movable toward and from said path, and means for operating said tool comprising a reciprocable cam, a rack movable therewith, a reciprocating member carrying a gear engaging said rack, and a stationary rack engaging said gear.

27. A box wrapping machine comprising a form block for moving a. box and a wrapper along a path, a wrapping tool movable toward and from said path, and a linearly reciprocating member operating in timed relation to said form block having a lost-motionconnection to said wrapping tool and positively effecting its movement toward and from said path.

28. A box wrapping machine comprising a form block for moving a box and a wrapper along a path, a slide adjustable toward and from said path, a tool carried by said slide guided for reciprocation toward and from said path, and a linearly reciprocating member carried by said slide having a lost-motion connection to said wrapping tool and positively effecting its movement toward and from said path.

. 29. A box wrapping machine comprising a form block for moving a box and a wrapper along a path, slides adjustable toward and from said path, tools, carried by said slides, guided for reciprocation toward and from said path, and linearly reciprocating members carried by said slides having lost-motion connection to said tools and positively efiecting their movement toward and from said path.

30. A box wrapping machine comprising a form block for moving a box and a wrapper along a path, a tool slide adjustable toward and away from said path, a plurality of wrapping tools, carried by said slide, movable toward and away from said path, and linearly reciprocating structure carried by said slide for positively operating said tools toward and from said path.

31. A box wrapping machine comprising a form block for moving a box and a wrapper along a path, a tool slide adjustable toward and away from said path, a plurality of wrapping tools carried by said slide, and a linearly reciprocating member carried by said slide for positively moving said tools toward and from said path having a lost motion connection to one of said tools and connected to another of said tools by a motionmultiplying system.

32. A box Wrapping machine comprising a form block for moving a box and a wrapper along a path, a tool slide adjustable toward and away from said path, a plurality of wrapping tools carried by said slide, a reciprocating member carried by said slide for positively moving said tools toward and from said path having a lost motion connection to one of said tools and a reciprocating cam operated by said member, to effect actuation of another of said tools.

33. A wrapping machine comprising reciprocating form block structure for moving a box and a wrapper along a path, a corner-lap tool pivoted'for rotation about a fixed axis extending substantially at right angles to the path of movement of said form block structure, and mechanism for effecting rotative movement of said corner-lap tool about said fixed axis during movement of said form block to eiiect a corner-lap operation.

34. A wrapping machine comprising reciprocating form block structure for moving a box and a wrapper along a path, a tool slide adjustable toward and from said path, a corner-lap tool pivotally mounted upon said slide, a reciprocable frame carried by said slide, a wrapping tool mounted on said frame, motion-transmitting means extending to said slide to effect operation of said wrapping tool, and a second motion-transmitting means extending to said corner-lap tool independently of said first motion-transmitting means to effect rotative movement of said cornerlap tool to efifect a corner-lap operation during movement of said form-block structure.

ERNEST G. RIDER. WALTER T. BAILEY.