US3060650A - Honing apparatus for bread slicing machines - Google Patents

Description

Oct. 30, 1962 J. HANSEN 3,060,650

I-IONING APPARATUS FOR BREAD SLICING MACHINES Filed June 20, 1960 5 Sheets-Sheet 1 INVEN TOR. JOHN HANSEN ATTORNEY Oct. 30, 1962 J. HANSEN HONING APPARATUS FOR BREAD SLICING MACHINES 5 Sheets-Sheet 2 Filed June 20, 1960 FIG. 4

F l l l l I l mm S N A H m 0 J ATTORNEY Oct. 30, 1962 J. HANSEN 3,060,650

HONING APPARATUS FOR BREAD SLICING MACHINES Filed June 20, 1960 5 Sheets-Sheet 5 FIG. I4

use

r-w m 200- I96 H6. .5 5 a INVENTOR.

JOHN HANSEN ATTORNEY 3,066,650 HONING APPARATUS FOR BREAD SLICING MACI-IHVES John Hansen, Bettendorf, Iowa (1533 Rockingharn, Davenport, Iowa) Fiied June 20, 1960, Ser. No. 37,190 4 Claims. (Cl. 51-246) This invention relates to honing apparatus and has for its principal object the provision of a novel and improved honing structure having application to bread slicing and like machines of existing types.

Those familiar with the bread slicing art readily recognize the problems involved in the design and use of suitable honing apparatus, particularly since the accepted method of honing the endless blades involves honing the blades while in place and While they are operating at their normal speeds. Bread slicing machines inherently furnish further complications because of the close clearances involved, and this is especially true in those machines having four or more drums about which the endless bands are trained or looped. It is further desirable to carry out the honing operation so that both sides of the blades are honed simultaneously, but in a four-drum slicer, for example, this has heretofore been impossible because the spacing of the drums is such that conventional honing apparatus could not be accommodated. According to the present invention, a novel hone structure is provided which is sufficiently compact to be accommodated by the limited spaces available in slicing-machines of the character noted. It is a further object of the invention, according to one form thereof, to provide the honing apparatus in sets of two different devices and, in another form of the invention, to provide two sets of honing devices closely related and linked together for operation in proximity to each other, despite the space limitations discussed above. It is a further object of the invention to provide honing apparatus that may be power or manually operated. Other objects reside in a hone carrier of hollow construction which accommodates the honing device in the limited space available, provision for adjustability, provision for easy removal of the honing apparatus without dismantling the slicer, and provision for automatically stoppingthe loaf-feeding means when the honing operation is initiated.

The foregoing and other important objects and desirable features inherent in and encompassed by the invention will become apparent as preferred embodiments thereof are disclosed, by way of example, in the following description and accompanying sheets of drawings, the figures of which are described below.

FIGURE 1 is an enlarged fragmentary elevation, with portions omitted and other portions in section, showing two honing apparatuses at opposite ends of a typical fourdrum slicer.

FIGURE 2 is a schematic view illustrating the band arrangement in a four-drum slicer, together with the means for feeding loaves to the slicer bands.

FIGURE 3 is a wiring diagram showing the electrical circuit for controlling the motor to the loaf-feeding means.

FIGURE 4 is a view as seen along the line 4-4 of FIGURE 1.

FIGURE 5 is a view as seen along the line 5-5 of FIGURE 1.

FIGURE 6 is a section, drawn to an enlarged scale, as seen along the line 6-6 of FIGURE 4.

FIGURE 7 is a perspective of one of the mounting brackets.

FIGURE 8 is a section as seen along the line 8-8 of FIGURE 1.

FIGURE 9 is a section as seen along the line 2-9 of FIGURE 4.

366M550 Patented Oct. 30, 1962 ice FIGURE 10 is a section as seen along the line 10-10 of FIGURE 4.

FIGURE 11 is a section as seen along the line 11-11 of FIGURE 6.

FIGURE 12 is an enlarged section as seen along the line 12-12 of FIGURE 4.

FIGURE 13 is an elevation, partly schematic, of a modified form of hone apparatus including a pair of hone means linked together and power driven.

FIGURE 14 is a partial plan of the same.

FIGURE 15 is a section on the line 15-15 of FIG- URE 14.

FIGURE 16 is a schematic view of the upper pair of drums in a form of slicer different from that shown in FIGURE 2.

The general nature of the manually-operated honing apparatus will best be understood from initial reference to FIGURE 2, which shows schematically a bread slicer of the four-drum type, such as that forming the subject matter of U.S. Patent 2,424,659. As illustrated, the slicer comprises a pair of upper drums 2t and 22, carried on closely related parallel axes, and a pair of lower drums 24 and 26, related symmetrically as respects the upper drums. One of the upper drums may be driven, as by an electric motor represented schematically and designated by the numeral 28. A plurality of slicer bands, as at 36, are trained or looped about the drums 20 and 26 and are guided by the deflecting drums 22 and 24, and each band is crossed intermediate its ends in a slicing Zone 32 to which a series of loaves of bread, as at 34, is fed via feeding means in the form of a conveyor 36 driven by a separate electric motor 38, for example. The crossing of the bands, as will be readily understood by those versed in the art, presents a pair of parallel cutting portions in the slicing zone 32, and the loaves move through this zone from left to right as seen by the reader and are ultimately carried off a table 40 for wrapping. It will further be understood that each band is identically arranged and that there are of course several bands spaced crosswise of the drums.

The nature of each band and the manner in which it is trained about and deflected by the drums 2t), 22, 24 and 26 is such that a short upper band portion 42 extends tangentially from the drum 20 to the drum 22, and a similar portion 44 is duplicated between the drums 24 and 26, Whereas longer portions 46 and 48 extend between the drums, the portion 46 extending from the drum 20 to the drum 26 and the portion 48 extending from the drum 24 to the drum 22, these portions crossing as aforesaid in the slicing Zone 32. Since the portions 46 and 4% cross, it will be clear that one side of the band faces upwardly and to the left in the zone of the drums 24 and 26 and the opposite side faces upwardly and to the left or away from the zone of the drums 20 and 22. This characteristic enables the use of upper and lower honing devices indicated respectively in their entireties at 50 and 52. These devices are shown in detail in FIGURES 1 and 4 through 12.

The slicer includes, of course, suitable supporting structure or framework and representative portions thereof are shown in the drawings at 54 and 56 in the area of the upper drums 20 and 22 and at 58 and 60 in the area of the drums 24 and 26 (FIGURES 1, 4 and 5).

From reference again to FIGURE 2, it will be seen that the spatial relationship of the drums 20 and 22 is such as to afford therebetween a relatively small or limited space 62 bounded by the proximate portions 42 and 46 of the bands and by peripheral portions of the drums 20 and 22. A similar space 64 exists between the drums 24 and 26, bounded by band portions 46 and 44. As stated above, the portion 46 of the band presents opposite sides respectively in the areas of the upper and lower drums. Consequently, as shown in FIGURES l and 2, the upper honing apparatus operates on the upper or leftward side of the band portion 46 and although it appears that the device 52 is operating on the same side, it is actually operating on the opposite side because of the crossing of the band portions in the slicing zone 32. Consequently, it is the honing device 52 that is accommodated by the relatively limited space 64, whereas the honing device 50 can be placed in what might be regarded as an area external to the space 62. However, in the interests of economy, the two devices are made substantially identical, with the exception of supporting structure or mounting brackets, which is due largely to differences in the characteristics of the frame members 54, 56, 58 and 60.

Further reference will be had in detail largely to the honing device or apparatus 52, with brief reference to the apparatus 50 where differences are significant.

The device or apparatus 52 is designed so that it has the characteristic of spanning the lower frame members 58 and 60 and for this purpose mounting means is afforded in the form of a pair of dissimilar brackets 66 and 68. The bracket 66 is shown by itself in FIGURE 7 and it is clear from that figure that the bracket has therein a pair of slots 70 adapted to receive securing means, as cap screws 72 (FIGURE 1) for mounting same on the frame 58, the slots 70 providing for selective inward and outward adjustment, as will be obvious. The other bracket 68 is secured to the opposite frame 60 as by cap screws 74, and slots 76 are provided in this bracket to enable adjustment of the bracket, the direction of the slots being such that the bracket may be adjusted perpendicularly to the band portion 46.

The bracket 68 fixedly receives one end of a transverse element or rod 78, the opposite end of which is fixedly carried in an intermediary bracket 80 which in turn is carried by the bracket 66 by the medium of a pair of cap screws 82, the bracket 80 being apertured at 84 (FIGURE and the bracket 66 being slotted at 86 (FIGURE 7) to provide for adjustment of the bracket 80 generally along the length of the band portion 46.

The rod 78 carries thereon a concentric tube 88, the tube being elongated so as to span the entire set of bands as best shown in FIGURE 5, and bushings being used, as

at 90, to mount the tube for both rocking and reciprocaof which is spaced outwardly from the mounting member to make provision for removably receiving the proximate end of the hollow support 96, which is slotted at 100 (FIGURE 8) for that purpose. The opposite end of the support 96 has a different form of slot 102 therein for receipt by a headed pin 104. The slot 100 is made long enough so that the support 96 may be connected first to the pin 98 by inserting same generally transversely to the set of bands, until the slot 102 is in register with or receivable by the pin 104, after which the support 96 may be moved back so that the slot 102 hooks onto the pin 104. A spring-loaded locking pin 106 is provided at that end of the support 96 including the slot 102. Thus, the support 96 may be readily mounted on or dismounted from the rod 78 without disturbing the bands or structural parts of the slicing machine.

As best shown in FIGURES 8, 9 and 10, the support 96 is recessed so as to afford a hollow structure having an open side facing toward the proximate area of the band portion 46 that bounds the lower space 64. The hollow nature of the support enables it to accommodate a hone carrier 108 which in turn mounts a bone element or hone means 110 of such length as to span the entire set of blades. Although not important here, the hone means may be made up of a plurality of short cylindrical hones placed end-to-end and mounted on the carrier 108 as via a plurality of mounting clips 112 and mounting screws 114.

The carrier 108 is pivoted intermediate its ends at 116 to the center of the hollow support 96, the axis of the pivot being generally lengthwise of the band. In this manner, the carrier 108 and hone means 110, rigidly assembled via the clips 112 and cap screws 114, become a single unit or beam fioatingly mounted in the support 96 with the hone means 110 exposed at the open side of the support. The floating mounting of the unit, made available by the pivot 116 and the controlled accommodation of the unit in the hollow support, enables the hone means to adapt itself to the blades, and particularly to the seallops which are conventionally provided in blades and which of course must be honed in the valleys thereof as well as at the peaks thereof. As will best be seen by comparison of FIGURES 9 and 10, the intermediate portion of the carrier 96 relatively closely receives the proximate intermediate portion of the carrier 108 so that unnecessary looseness is provided; yet, outer portions of the support are cut away or hollowed out sulficiently to accommodate the mounting clips 112 and mounting screws 114. Portions of the under edges of the support are cut away at 118 to accommodate portions of the clips 112 (FIGURES 8 and 9).

It is a characteristic of the relationship of the carrier 108 and hone means 110 as a unit that this unit is in turn mounted on the support 96 via the pivot pin 116 and the assembly may be readily removed from the mounting members 92 and 94 via the releasable mechanism previously described as including the pin 98 and slot at one end of the support and the slot 102, pin 104 and locking device 106 at the opposite end. The compactness of the assembly is such that it is not only readily accommodated in the limited space 64 during operation but may be easily installed and removed without disturbing the basic components of the slicing machine.

When the assembly comprising the support 96, carrier 108 and hone means is in its operational status, it is of course mounted on the tube 88 and that tube in turn is both rockable and slidable on the rod 78. Consequently, the hone means 110 can be moved into and out of engagement with'the band portions 46 and when in engagement therewith can be slid back and forth along the rod 78 to perform the honing operation. When the honing operation is complete, rocking of the assembly just noted will disengage the hone means 110 from the bands and the machine may continue with its slicing operation.

For the purpose of receiving the necessary rocking and reciprocating motion, the mounting member 92 is formed as a yoke 120 having opposite arms equipped with diametrically opposed adjustable cam followers 122 engageable with a cam 124 fixed to a shaft 126 journalled and slidable in extensions 128 of the bracket 80. When the cam 124 is turned by the shaft 126, as via a handle 130, the position of the hone means 110 as to engagement with or disengagement from the band portions 46 is changed. Looking now at FIGURES 1 and 12, it will be seen that counterclockwise rotation of the cam 124 will cause clockwise rotation of the yoke 120 about the axis of the rod 78, thereby lifting the hone means 110 from the band portions 46. The shape of the cam, as will be obvious, is such as to limit rotation to slightly more than 90, stop portions on the earn, as at 132 and 134 being operative to engage one of the followers 122. When the cam has been turned so as to achieve engagement of the hone means 110 with the band portions 46, the shaft 126 may be utilized to shift the hone support 96, and consequently the unit 108-110, back and forth therewith along the aXis of the rod 78, the tube 88 carrying the support via the mounting members 92 and 94 and Sliding on the rod 78 via the bushings 90. For the purpose of achieving the back and forth movement, the yoke 120 is recessed at 135 (FIGURE 6) to receive a depending portion 136 of the cam 124, this means affording a connection by which the reciprocating movement of the shaft 126 is imparted to the honing assembly. Reciprocation is limited by a pair of stop collars 138 and 140 secured to the shaft 126.

The shaft 126 also rotates a second cam 140, but this cam is journaled by a bearing 144 in one of the extensions 80 so that, although it rocks with the shaft 126, it does not slide with the shaft. The shaft 126 is slotted at 146 to receive a pin 148 in the cam 142, but this pin does not pass through the proximate portion of the extension 80. Consequently, the earn 142 is keyed to the shaft 126 for rocking therewith, but the shaft 126 slides independently of the cam which, as best shown in FIG- URE 6, is retained against axial movement by its own shape and further by having the collar 140 secured thereto.

The purpose of the cam 142 is to control an electrical circuit to the motor 38 (previously described) for the loaf feeder 36. As shown in FIGURE 3, the motor 38 is wired into a circuit including a pair of switches 150 and 152, both of which are normally closed when the slicer is in operation so that the feeder 36 is effective to feed loaves 34 to the slicing Zone 32. As best shown in FIGURE 6, the switch 150 is accommodated by a switch box 154 and is controlled by a plunger 156 which is in engagement with the cam 142. When the hone means 110 is in engagement with the band portions 46, the position of the cam 142 is such that the plunger 156 is spring-pressed downwardly, thus opening the switch 150 so as to break the circuit to the motor 38 and thus to stop the loaf feeder 36. The purpose of this arrangement is to stop the feeding means with a loaf 34 in the slicing zone 32 so that particles of steel and abrasive resulting from the honing operation will be accumulated by the stationary loaf, the loaf thus serving as a wiper for the band portions as they are honed. When the honing operation is discontinued, the shaft 126 is turned back to its position to disengage the hone means 110 from the band portions and consequently the cam 142 elevates the plunger 156 to again close the switch 150. The loaf that served as a wiper is then discarded.

As previously stated, the honing apparatus or device 50 is substantially identical to that already described and identified in its entirety by the numeral 52. Accordingly, it is deemed unnecessary to repeat the detailed descriptions. Sufiice it to note that the device 50 includes a transverse rod 78, mounting means including brackets 66 and 68', an operating handle 126' and hone means 110 for operating on the opposite side of the band portion 46 in the area of the upper drums 20 and 22. Likewise, the upper hone means 50 includes a switch box 158 which accommodates the other switch 152 in the circuit. Therefore, this circuit will be broken whenever either of the hone means is in engagement with the band portions 46. Another difference in the upper hone device is that the bracket 66 is supported on the slicer frame 54 by an additional support 160, this difference being due to a peculiarity in the machine. Nevertheless, the basic components of the two devices 50 and 52 are identical so that they may be economically produced. On this basis, then, it will be understood that the design, structure and function of the two devices 50 and 52 are for all practical purposes identical and what is said relative to one applies also to the other.

In that form of the invention shown in FIGURE 13, a pair of identical hone devices 162 and 164 are linked together and are power driven. This type of apparatus may be used in a different form of slicing machine in which the upper drums, as at 166 and 168 (FIGURE 16) are arranged in a manner different from that in FIGURE 2. In this case, the bands are trained about and deflected by the drums so that a band portion 170 that passes beneath the drum 168 loops about the drum 166 and returns at 172, the portions 170 and 172 crossing in a slicing zone and being trained about a pair of lower drums much in the manner of FIGURE 2 In this case, however, the offset between the drums 166 and 168 is such that there is a larger space 174 available between the drums. More significant, however, is the fact that the portions and 172 of the band are spaced apart sufficiently to enable use of the hone apparatus 162 in the area noted, without causing deflection of the band portions 170 into the band portions 172, which is not the case in a slicer of the type represented by FIGURE 2. Therefore, the two hone devices may be linked together and power driven, in a manner to be presently described.

The machine equipped with the drums 166 and 168, and additional drums symmetrically arranged but not shown, includes supporting structure having a frame 176 which mounts power drive means, such as an electric motor 178 which includes a bracket 180 on which is journaled, on an axis transverse to the band portions 170 and 172, a cam 182 having therein a helical track 184 which is followed by a follower 186 fixed to a sleeve 188 which in turn has rigid thereon a pair of diametrically oppositely extending arms 190. The cam 182 is fixed against axial displacement relative to the bracket 180 and therefore rotation thereof will cause movement of the sleeve 188 inwardly and outwardly through an extent determined by the pitch of the helical track 184.

Each arm 190 is bifurcated at its free end to rockably and non-axially movably receive a collar 192 which is preferably formed integral with a short sleeve 194 (FIG- URE 15 Each sleeve 194 is coaxially fixed to a tube 196 which is the counterpart of the tube 88 described in connection with FIGURES 1 through 12, and each tube 196 is bushed or otherwise supported on a transverse rod 198 which is generally the counterpart of the rod 78 previously described. Each tube 196 is therefore rockable on and slidable along the respective rod 198 with the sleeve 194. Each tube 196 further carries at its opposite ends a pair of mounting members 200, only one of which is shown for each tube 196, it being understood, of course, that the one not shown at the opposite end is identical and in this respect the mounting member 200 is the counterpart of that previously described at 94. Each pair of mounting members carries a hone support 202 which is the counterpart of the hone support 96 described above, and each hone support mounts hone means 204 like that described previously at 110. Consequently, all the details of structure, function and result, as respects the mounting of the hone carrier and its components as described above apply to the fundamental structure in FIGURES 13 through 15; although, as Will be brought out below, there are differences in operation.

Just as in the case of the previously described hone apparatus, each hone means 204 in FIGURES 13 through 16 is movable between engaged and disengaged positions as respects the band portions 170 and 172. :In FIG- URE 13, the hone means are shown in their band-engaging positions, from which they may be rocked counterclockwise to disengaged positions. This is accomplished by linking the two hone means together in a manner to be presently described.

Each shaft 198 carries at its end adjacent to the motor 178 an arm 206 which has integral therewith a sleeve portion 208 keyed at 210 to the associated sleeve and collar 194. The purpose of the keyed connection is to enable the sleeves 194 and tubes 196 to both reciprocate and rock on the rods 198 with the arms 206 but without changing the positions of the arms axially of the rods. In other words, the assembly comprising the cam sleeve 188, yoke arms 190, sleeves 194, tubes 196 and hone devices reciprocate relative to the arms 206. At the same time, the arms 206 are capable of rocking in unison without affecting any change in the angular position of the cam sleeve 188 and arms 190.

For the purpose of effecting rotation of the cam 182 so as to propel and repel the arms 190 and their associated components, the cam is driven by a chain and sprocket drive 208 from the motor 178. The speed reduction is such that the hone means 204 are moved back and forth across the blades at a rate consistent with efiicient honing the hone means 204 being first, of course, moved into engagement with the band portions 170 and 172 by rocking the arms 206 simultaneously through the medium of a pair of links 210 which pivotally interconnect the arms and which have cam followers 212 and 214 respectively engaging a pair of cams 216 and 218 concentrically and fixedly secured to a shaft 220 appropriately journaled and driven by gearing including a pair of gears 222 and 224 from the shaft which carries the sprocket of the chain and sprocket drive 208. The timing of the drive is such that five strokes of reciprocation of the bone means are made while the hone means are in engagement with the band portions 170 and 172. In other words, after five strokes, the cams 216 and 218 make one revolution and consequently rock the tubes 196 so as to disengage the bone means from the band portions. As shown in FIGURE 13, the hone means are in engagement with the band portions and the positions of the cams 216 and 218 are such that disengagement of the hone means from the bands is imminent.

The purpose of providing the two cams is that an entire revolution is required.

Another feature of the arrangement is that the links 210, although pivotally connected at one end at 226 to one of the arms 200, include an adjustable connection at their opposite ends to the other arm 206. The adjustment means includes a block 228 having a pin 230 which passes pivotally through the associated arm 206 and which is further accommodated by slots 232 in the associated portions of the links 210. A lug 234 is rigidly connected to the links and is offset relative thereto so as to be in alinement with the block 228. The block carries rigidly thereon a threaded member 236 which extends through the apertured portion of the lug 234, and which receives externally thereof an adjusting nut 238 having a collar connection 240 with the lug, so that turning of the nut on the screw 236 will propel and repel the block 228 which in turn will cause rocking of the arm 206 via the pin 230 relative to the other arm 206. In other words, the arm 206 may be adjusted lengthwise of the links within the limits of the slot 232 and the timing of the two hone means may thus be adjusted. After the adjustment has been made, it may be secured by a locking thumb nut 242.

Here again, the construction features compactness and economy and lends itself to power driven honing in slicers of the type represented by the schematic view in FIGURE 16.

In both forms of the invention, features other than those categorically enumerated will readily occur to those versed in the art, as will many modifications and alterations in the preferred embodiments disclosed, all of which may be achieved without departure from the spirit and scope of the invention.

What is claimed is:

1. Honing apparatus for a bread slicing machine having a frame, a pair of frame-carried parallel upper drums and a pair of frame-carried parallel lower drums and a plurality of slicer bands spaced across and trained about one lower drum and one upper drum and guided by the other lower drum and by the other upper drum, the axes of the drums in each pair being offset so that a first portion of each band travels from one drum of one pair to the other drum of said one pair and a second portion of each band travels from said other drum of said one pair to one of the drums of the other pair and affording a space between the proximate peripheral portions of the drum in which said second band portions are accessible, said apparatus comprising: a mounting element supported on the frame in transverse register with the space between one pair of drums; elongated hone means paralleling said one pair of drums in said space in traversing relation to said second band portions and adapted to engage and disengage said second band portions; and means mounting the hone means on said element for movement of said hone means selectively into and out of engagement with said second band portions; second hone means disposed proximate to and in traversing relation to said first band portions for selective engagement with and disengagement from said first band portions; means mounting said second hone means on the frame for movement into and out of engagement with said first band portions; and means interconnecting the hone means for movement in unison so that the two hone means move together to respectively engage and disengage their respective band portions.

2. In a bread slicing machine having a frame, slicer means carried by the frame and having a slicing zone and a honing zone, means for driving the slicer means, means carried by the frame for feeding a continuous series of loaves to the slicer means in the slicing zone to be sliced thereby and means for driving the feeding means, the improvement comprising: hone means carried by the frame in a normal position disengaged from the slicer means in the honing zone; control means for changing the position of the hone means to one of engagement thereof with the slicer means in the honing zone while the slicer means continues in operation; and means connected between the control means and the means for driving the feeding means for stopping the latter while a loaf is presented to and being sliced by the slicer means in the slicing zone in response to said change in position of the hone means.

3. Honing apparatus for a bread slicing machine having transversely spaced apart elongated frame members and a plurality of drum-carried slicer bands running lengthwise of and between said members, said apparatus comprising: a transverse elongated hollow hone support extending crosswise of and adjacent to the bands and having an open side relatively close to and facing said bands; means mounting said support on at least one of the frame members for movement toward and away from and for reciprocation crosswise of the bands; and hone means carried by the support and including a carrier received at least in part within said support and a hone element carried by the carrier and exposed at said open side for engagement with and disengagement from the bands as said support is moved toward and away from the bands, said carrier comprising a beam within and generally parallel to the support and mounting said carrier, said beam being pivotally connected to the support intermediate the ends of the support on an axis lengthwise of the frame members for limited rocking of the carrier and hone means without said axis relative to the support.

4. Honing apparatus for a bread slicing machine having a frame, a pair of frame-carried parallel upper drums and a pair of frame-carried parallel lower drums and a plurality of slicer bands spaced across and trained about one lower drum and one upper drum and guided by the other lower drum and by the other upper drum, the axes of the drums in each pair being closely offset so that a first portion of each band travels from one drum of one pair to the other drum of said one pair and a second portion of each band travels from said other drum of said one pair to one of the drums of the other pair and affording a limited space between the proximate peripheral portions of the drums in which said second hand portions are accessible, said apparatus comprising: a mounting element having an end portion axially beyond the ends of one pair of drums and supported on the frame via said end portion and extending parallel to one pair of drums in the space therebetween; elongated substantially continuous hone means paralleling said element in said space and generally coextensive in length with the transverse area occupied by the bands so as to lie in traversing relation to said second band portions and adapted to en gage and disengage said second band portions; means on the hone means providing an end portion proximate to said element end portion; means mounting the hone means on said element for movement of said hone means selectively into and out of engagement with said second hand portions; means operatively connected to the hone means end portion for moving the hone means as aforesaid; second hone means disposed proximate to and in traversing relation to said first band portions for selective engagement with and disengagement from said first band portions; means mounting said second hone means on the frame for movement into and out of engagement with 10 said first band portions; and means connected to and for moving the two hone means in unison so that said two hone means move together to respectively engage and disengage their respective band portions.

References Cited in the file of this patent UNITED STATES PATENTS 2,185,835 Criner Jan. 2, 1940 2,537,512 Crissey Jan. 9, 1951 2,978,849 Visnaw Apr. 11, 1961 2,999,823 Irvin Aug. 29, 1961

Images