US3079738A - Honing attachment for bread slicing machine - Google Patents

Description

March 5, 1963 R. N. wlNFREE ETAL 3,079,738

HONING ATTACHMENT FOR BREAD SLICING MACHINE Filed March 20, 1959 4 Sheets-Sheet 1 ATTORNEYS` March 5, 1963 R. N. WINFREE ETAL 390799738 HONING ATTACHMENT FOR BREAD SLICING MACHINE Filed March 20, 1959 4 Sheets-Sheet 2 ATTORNEYS March 5, 1963 R. N. WINFREE ETAL, 3,079,738

HONING ATTACHMENT FOR BREAD SLICING MACHINE BY Ma@ Filed March 20, 1959 March 5, 1963 R. N. WINFREE ETAL 3,079,738

HONTNG ATTACHMENT FOR BREAD sLTcTNG MAcHINE Filed March 20, 1959 4 Sheets-Sheet 4 ATTORNEYS ate This invention relates to a honing or sharpening-device 'for multiple slicing blades or knives as endless bands for automatic bread-slicing machines.

It is an Vobject of the invention to provide a hone or abrasive rod extending7 along all of the blades of the slicing machine with one hone for sharpening one `side of the blade and a second hone or abrasive vrod for 'sharpening vthe other side of the blade. Another object of the invention resides in the honing device providing 'a drive wheel connected by belts to each of the two hones to drive one hone in one direction of rotation and thevother hone `in the opposite direction of rotation.

A further object of the invention is to provide a'honin'g device as an attachment for a bread slicing machine which can be readily applied on 'and in existing slicing machines.

A still further object of the invention resides in the mounting of the honing device so that both grinding rods 'may be shifted as a unit together with a friction drive wheel which latter may contact one of the band blade drums to thus drive both abrasive rods. Another object of the invention resides in contacting the cutting bands Where the blade has twisted approximately through a l2 degree angle. A further object of the invention resides in the provision of drive belts 'from pulleys on the drive wheel shaft to each of the grinding rods with one belt twisted but the other belt untwisted to impart opposite directions of rotation to such grinding rods.

It is another object of the invention to provide a unit as an attachment to be secured in a bread slicing machine to sharpen all the band blades while the machine is running by contacting both sides of each band either singly or all at one time. By manual shifting of the hones in contact with the blades the entire unit is shifted to pre`- vent grooving of the hohes.

Further objects will be apparent from the following description when considered in connection with the accompanying drawings in which:

FIG. l is a front plan view of the slicing machine,

FIG. 2 is an end elevation of the machine of FIG. l,

FIG. 3 is a diagrammatic end view of the machine indicating the rotary motions of the two hones', A

FIG. 4 is a side elevation of one of the rollers with a modified power take ot for the grinding rods with part of the grinding wheels in section,

FIG. 5 is an end view of the upper part of the machine showing a modified structure, Y FIG. 6 is a plan view of a modied honing device as an attachment, K l

FIG. 7 is a side view of the modified device of FIG. 6,

FIG. 8 is a cross section of the device taken on line S-S of FIG. 6,

FIG. 9 is a side elevation of one side of the device,

FIG. l0 is' a side elevation of a mounting bracket taken on line lil-1d of FIG. 9 in the direction of the arrows, and

FIG. ll is a perspective View of the shifting means for the hones.

The honing device is illustrated as applied to a twentyone blade or cutting band bread slicing machine or machine for slicing other commodities of the general type 2 'as 'for example shown in UQS. lPatent .-No. 2,768,486, dated October 30, 1956. The bread slicing machine includes two rollers 3 and 4, FIG. l, one or both of which may be driven, and which Yfrictionally` drive `Athe plurality of endless knife band blades 2 which blades partially encircle the 'rollers fin atwis'e position but are -forced by guide means, not shown, Vto edgewise relationshipwhere th'e runs of the blades cross each other during 'their passage through the loaves of bread to be sliced. The band blades 2 are in the nature of knives which pass around the roilers 3 and 4 ywhile any number of band knives may -be provided, Fi'G. l shows a twenty-one blade machine with the driven roller or dr'u'r'n 3 mounted in a frame, not shown, by means of spindle 5. As shown in FIG. 3 each blade crosses at its approximate center point between the rollers 3 and 4 where a platform is provided for supporting 'the loaves of bread to be sliced and as viewed in PIG. 3 the blades 'are 'at right angles at the platform 6 relative to the travel around .the rollers 3 and 4. -FIG. 3 shows by arrows 7, the direction of rotation of the rollers 3 Yand `4 which is in counter directions as to the two rollers and such rotary motion is du'e tothe crossed blad's.

It sohappens that it is desired to periodically or at Vodd times to sharpen the band knives 2 and for this purpose, according to the invention, a honing device 3 is provided which comprises a pair of hones or abrasive elements'9 and 10, each honing element extending across all of the blades as shown in FIG. 1. Each hone is in the form of a round bar and is rotatably mounted in end bearing brackets 11 by means of spindle shafts 12 and such brackets are suitably secured in a frame. A rubber friction drive wheel 13 is mounted to rotate intermediate 4the hones 9 and 10 and this rubber wheel 13 has a drive pulley 14 secured thereto which drives the hones 9 and 1? by means of belts or driving cords 15 and 16.' The driving belt 15 is not crossed but the belt 16 is crossed and this is for the purpose of imparting diierent directions of rotation to the hones 9 and 10. The directions of rotation of the pulley 14 and the bones are indicated by the arrows as shown in FG. 3 which also shows the' directions of travel of the runs of the knife bands 2'; f

The honing stones or rods` 9 and 16 may be lmade of any suitable abrasive material and as an example Carborundum may be mentioned and eachstone may be at least two inches in diameter and two inches long.

Referring again to the bearing brackets 11, each of the hones 9 and 10 is rotatably mounted on its spindle shaft 12 and. these elements together with the drive' wheel 13, the pulley 14, and :the belts v15 and v16 are mounted as a movable unit supported on pivots 17 `suspended by lever arms 18 having an outwardly projecting extension arm 19 yprovided with a handle 20. FIG.v 2 shows in solid lines, the hones 9 and 10 outv of contact with the bands 2 and in dotted lines the unit 8 adjusted to the left so that the Wheel 13 is in contact with the roller 3 and the hohes 9 and 10 are incontact with the side edge of each band 2. As shown in FIG. 3 with the hones in contact to grind the blade, the hone 9 is sharpening on one side of the blade 2 while the hone 10 is sharpening the other side of the blade, resulting in the sharpening of both sides of the 4blade to thus restore a sharp edge to each cutting band. The stones 9 and 10 are located far enough down from the roller 3 and along the twisting blade 2 in order to have a sharpening angle of approximately 12 degrees from the vertical. The hones are located approximately 6 inches down from the roller measured at the point where the band 2 begins to contact the roller at 21, FIG. 3, and -at 22 where it leaves the roller 3 and measured to the rotating axes of the hones.

The device, according to FIGS. l to 3, operates as follows:

In the normal slicing operation of the machine the hones 9 and 10 are maintained out of contact with the knife bands 2 as shown by lsolid lines in FIG. 2. If it is now observed that the bread slices show tears and mutilation, the slicing is stopped and with the machine continuing to run, the handle 2i? is pulled and moved to the left or upwardly, FIG. 2 to adjust the hones 9 and 16 to the left to contact the blades 2. At about the time the hone-s contact the blades, the wheel 13 contacts the drum 3 and this sets the hones in rotation counter to each other in the directions of the Iarrows in FIG. 3. Both sides of the rblades are sharpened at the same time and after a short time when it is considered that the blades each again have a sharp edge,'the handle 26 is released so that a tension spring 23 secured at one end t-o the arm 18 at 24 will cause the unit 8 to be forced back to the righ-t to strike a stop or abutment 25.

FIG. 4 shows a modified power take off for the grinding rods and as shown the roller or drum 3 is provided with the spindle 5. The driving shaft 26 is mounted in end bearings 27 which are secured to mounting plates 29 suitably mounted but preferably pivoted on the spindle 5. The shaft 26 has two end rubber wheels 3i) adapted to contact the roller 3 by frictional contact. A pair of pulleys 31 are secured on one end of the shaft 26 to rotate therewith. These pulleys 31 are provided to rotate the pair of grinding rods only one of which is shown in FG. 4 but both are shown in FiG. 5.

As shown in FIG. 4 the hones or grinding rod shown is made with a plurality of grinding hones 31 cach in the form of a cylindrical section which may be glued or cemented to each other and on hubs 32 mounted on the shaft 26 to be driven thereby.

FIG. shows the drum 3 with a modified structure with an end view of the slicing blades or bands 2. The drum 3 is mounted on the spindle 5 mounted in va frame of the machine, not shown. A plate 33 is also mounted on the frame and this plate supports a bearing 34 for a second plate 35. This plate 35 has two supporting arms 36 and 37 secured thereon by rivets 38 or any other suitable means such `as by welding. Each pair of arms 36 and 37 supports a rod-shaped grinding or honing rod 38 and 39. Also mounted on the plate 35, there is a further arm 40 or pair thereof adjustably mounted on the plate 35 by means of a pivot rivet 41 and a further rivet pin 42 cooperates in a slot 43 in the arm 40. A pair of pulleys 44 are mounted on the shafts 45 and such pulleys are mounted to rotate with the rubber friction drive wheels 46. The honing rod 38 is provided with a pulley 47 and the honing rod 39 is provided with a pulley 48. A crossed belt 49 is connected to one of the pulleys 44 and the pulley 47 and a non-crossed belt 50 is connected to the other pulley 48 and one of the pulleys 44. An operating lhandle 51 is secured to the plate 35 land an adjustable stop screw or bolt 52 is threaded in a member or block 53 which by means of a lock nut 54 will permit the setting and adjustment of the unit comprising the plates 35 and the honing rods and operating pulleys as well as the friction drive wheels.

' As shown in FIG. 5, the honing rods are in contact with both sides of the edge part of each blade 2 so that both sides of the band 2 are sharpened. The hand of the operator holds the handle 51 in the position of the honing unit as shown in solid lines in FIG. 5 but when released a tension spring 55 secured at one end 56 to the frame and the other end at 57 to the plate 35, will pull the grinding device to the left around the spindle 5 as a pivot to thus move the grind rods out of contact with the cutting bands. i

FIGS. 6 to ll show a form of invention in which the frame which moves the hones back and forth across the blades is controlled by a lever. When the lever is pulled down, the hone on top of the blades after they come over the drum and the hone just above the blade as they go under the drum and the rubber wheels for driving the hones all make their contacts simultaneously. At this point, the frame containing the hone and roller move in a horizontal position from the left to the right hand side of the machine approximately one and one-half inches. When the lever is released the spring below the lever pulls the frame back to the left hand side of the machine. During this horizontal movement the hones have contact with the blades and the rubber driving wheel has contact with the drum. Y

The mechanism as a unit is mounted in the frame 58 of a bread slicing machine just under one of the rolls or drums around which the cutting bands pass and as shown in FIG. 6 the side plates 59 are interconnected by a tie rod 66. A pair of opposite bearing members 61 are secured one to each plate 59, FIG. 6, and each bearing 61 cooperates with and slides on a spindle or stub axle shaft 62 secured on a frame bracket 63. The frame brackets 63 are secured in the frame 58 of the machine and FIG l0 shows in detail the bracket 63 secured by bolts 64 to frame 58, FIG. 10. The shaft 62 is secured on the bracket 63 by welding and is shown in FIG. l0. The attachment may shift to right and left during the operation of the grinding mechanism.

As shown in FIG. 6 a pair of grinding rods or cylinders 65 are preferably composed of small sections of one to two inches in width and cemented together to be rotated by its shaft 66 and 67. The shaft 66 ismounted in side bearing brackets 68 secured by bolts to its plate 59 and one end of the shaft 66 has a pulley wheel 69 mounted thereon. The other shaft 67 also has a pulley 70 mounted thereon at one end thereof. The shaft 71 has two or more friction wheels 72 secured thereon which latter are adapted to contact the roller drum 3 and this shaft 71 has a pulley 73 and 74 at each end thereof. 'Ihe pulleys 74 and 70 are connected by a belt 75 and the pulleys 73 and 69 are connected by a crossed belt 76. Thus when the wheels 72 and shaft 71 are driven, the hone 65 will rotate in one direction by means of pulley 74, belt 75 and pulley 70 whereas hone 65 will be driven in the opposite direction due to the crossed belt 76 cooperating with the pulleys 69 and 73.

A bracket arm 77 is secured by bolts 78, FIG.Y 7, to one of the plates 59 and this arm has a bent extension 79 on which a pivotally mounted arm 80 is secured. This arm 80 is pivoted at 81 and is provided with a spring 82 secured on a short arm 83. This spring 82 is also secured to a lug 84 of the control handle 85 pivotally mounted at 86 on a fixed part 87 of the frame. A connecting link 88 has a slot 89 therein through which the pivot bolt 81 passes and this link 88 is also pivotally connected at 89 to the xed part 87. A second spring V90 is secured to the handle lever at 91 with the other end connected to the frame and this spring 90 has one half the strength of the spring 82 so that the hones 65 will have a one and a half inch movement horizontally when in contact with `the blades to thus prevent a grooving of the bones.

The attachment of FIGS. 6 to 11 is easily installed in existing bread slicing machines or it may be readily built into new machines. The bracket members 63 are suitably bolted to the frame 58 of the slicing machine and the fixed part 87 is suitably secured on a cross rod 92 which latter is secured in the machine frame 58. During the sharpening operation of the attachment, the hones 65 contact all the blades 2 simultaneously on both side edges and this sharpening takes place while the operating wheels 72 are in contact with the roller 3. During the normal operation of the slicing machine the hones are out of contact with the blades held by spring 82, that is no sharpening ytakes place. It is however obvious that at times the blades 2 must be sharpened whereby the operator pushes down on the handle 85, FIG. 7, which. forces the sharpening device to pivot on its bearing pins vusingthe fixed part 87 as an abutment the arm 80 forces theframe and hones laterally on the bearing pins 62 to zlimit the slot in the link 88. This latter will cause the unit to shift axially relative to the bearing pins against the action or force of 'the spring 82 and when the hones have been shifted the wheels 72 will contact the roller 3 and the hones 65 will sharpen both sides of the blades while the spring 90 slowly forces the honing device to move axially on the pins 62 to thus prevent groovng of the hones during grinding. When the end position is reached the unit will be automatically disconnected and the sharpening of the blades is completed with the hones out of contact with the blades. The spring 82 being stronger than the spring 90, the slow return of the hones is assured. Normally the honing device is maintained in such a way with the hones out of contact with the blades, by means of a stop member 93 on an arm 94, FIG. 7, which member 93 abuts against a iixed part of the machine.

When the lever 85 is forced downwardly or to the right, FIG. 6, the arm 80 will force the honing device laterally at the same time that the wheels '72 make contact with the roller 3 and the hones will contact the blades. The honing cylinders could be held from lateral shifting but that may cause groovng by the blades so that the slow return of the hones laterally during grinding will will ensure the true maintenance of the hones.

We claim as our invention:

l. A sharpening device for bread slicing m-achines of the type having a plurality of crossed slicing bands running between and over a pair of spaced drum rollers, cornprising a pair of spaced plates pivotally mounted on a spindle of one of the drum rollers, two pairs of arms secured to the plates, a grinding rod rotatably mounted in each pair of arms and each rod having a pulley secured thereto, a friction wheel rotatably mounted in the plates and having a pair of pulleys rotating therewith, and a belt connected to each of the pulleys of the friction wheel and to each pulley of the grinding rods, said rods when adjusted in contact with the slicing bands acting to hone all of the bands simultaneously.

2. A sharpening device for bread slicing machines of the type having a plurality of crossed slicing bands running between and over a pair of spaced drum rollers, comprising a pair of spaced plates pivotally mounted on a spindle of one of the drum rollers, two pairs of arms secured to the plates, a grinding rod rotatably mounted in each pair of arms and each rod having a pulley secured thereto, a friction wheel rotatably mounted in the plates and having la -pair of pulleys rotating therewith, a belt connected -to each of the pulleys of the friction wheel and to each pulley of the grinding rods, and means to move the grinding rods and friction wheel as a unit so that the friction wheel is in contact with the drum roller and the grinding rods are in contact with the slicing bands,

3. A sharpening device for bread slicing machines of the type having -a plunality of crossed slicing bands running between and over a pair of spaced drum rollers, comprising a pair of spaced plates pivotally mounted on a spindle of one of the drum rollers, two pairs of arms secured to the plates, a grinding rod rotatably mounted in each pair of arms and each rod having a pulley secured thereto, a friction wheel rotatably mounted in the plates and having a pair of pulleys rotating therewith, a belt connected .to each of the pulleys of the friction wheel and to each pulley of the grinding rods, and means to move the grinding rods and friction wheel as a unit so that the friction wheel is in contact with the drum roller and the grinding rods are in contact with the slicing bands, the belt of one grinding rod being crossed and the belt of the other grinding rod being uncrossed so that .the grinding rods will rotate in dilerent directions of rotation.

4. A sharpening device for'bread slicing machines of the type having a plurality of crossed `slicin-g bands running between Vand over a pair of -spaced drum rollers, comprising a pair of spaced plates vpivotally mountedfon a spindle of vone of the drum rollers, two pairs of are-ms secured to .the pla-tes, -a grinding rod rotatably mounted in each pair of arms and each rod having a pulley secured thereto, a friction wheel rotatably mounted in the plates and having a pair of pulleys rotating therewith, a belt connected to each of the pulleys of the friction wheel and to each pulley of the grinding rods, and means to move the grinding rods and friction wheels as a uni-t so that the friction wheels are in contact with the drum roller and the grinding rods are in contact with the slicing bands together with means to permit the grinding rods to slide axially while the grinding operation proceeds to prevent lgroovng of the grinding rods.

5. A sharpening device for bread slicing machines of the type having a plurality of crossed slicing bands run ning between and over a pair of spaced drum rollers, comprising a pair of spaced plates pivotally mounted on .a spindle of one of the drum rollers, two pairs of arms secured to the plates, a -grinding rod rotatably mounted in each pair of arms and each rod having a pulley secured thereto, a friction wheel rotatably mounted in the plates and having a pair of pulleys rotating therewith, a belt connected to each of the pulleys of the friction wheel and to each pulley of the grinding rods, and means to move the grinding rods Vand friction wheels as a unit so that the friction wheels are in contact with the drum roller` and the grinding rods are in contact with the slicing bands together with means to permit the grinding rods yto slide axially while the grinding operation proceeds to prevent groovng of the grinding rods, said last mentioned means including a manually operated lever connected to operate the grinding rods.

6. A sharpening device for bread slicing machines of the type having a plurality of `crossed slicing bands running over a pair of spaced drum rollers, comprising a frame mounted in the machine by laterally-sliding bear. ings, a pair of honing rolls rotatably mounted in the frame, means in the frame for receiving motion from one of the drum rollers and to rotate the honing rolls, means for mounting the frame for lateral adjustment parallel to the axes of the honing rolls, and means connected to the frame and operable by a hand lever to shift the frame and honing rolls laterally whereby during the grinding of the bands the hones and frame will slowly shift to its initial position to thereby prevent groovng of the honing rolls.

7. A sharpening device according to claim 6, in which a spring is provided to slowly force the frame back to its initial position during the grinding operation.

8. A sharpening device according to claim 6, in which a pair of springs are provided of which both are connected to the hand lever so that one spring will tend to slow the other to permit a suificient grinding period for the hones.

9. A sharpening device according to claim 6, in which a pair of springs are provided of which both are connected to the hand lever so that one spring will tend to slow the other to permit a sufficient grinding period for the hones, one spring being stronger than the other.

l0. A sharpening device for bread slicing machines of the type having a plurality of crossed slicing bands running between and over a pair of spaced drum rollers, comprising a pair of spaced plates pivotally mounted on bearing pins to permit lateral sliding of the plates, two pairs of arms secured to the plates, a grinding rod rotatably mounted in each pair of arms and each rod having a pulley secured thereto, a friction wheel rotatably mounted in the plates and having a pair of pulleys rotating therewith, a belt connected to each of the pulleys of the friction wheel and to each pulley of the grinding rods, and means to move the grinding rods and friction wheels as a unit so that the friction wheels are in contact with 7 S the drum roller and the grinding rods are in Contact with v 'References Cited in the ile of this patent the slicing bands together with means to permit the grind- UNITED STATES PATENTS ing rods to slide axially while the grinding operation proceeds to prevent grooving of the grinding rods, said last Irsgton g mentioned means including a manually operated lever l5 2580778 Hemel? "f "f" Jn' 1 1952 .Connected t0 Operate the grinding rods- 2753936 Macchesney July 10, 1956

Claims (1)

1. A SHARPENING DEVICE FOR BREAD SLICING MACHINES OF THE TYPE HAVING A PLURALITY OF CROSSED SLICING BANDS RUNNING BETWEEN AND OVER A PAIR OF SPACED DRUM ROLLERS, COMPRISING A PAIR OF SPACED PLATES PIVOTALLY MOUNTED ON A SPINDLE OF ONE OF THE DRUM ROLLERS, TWO PAIRS OF ARMS SECURED TO THE PLATES, A GRINDING ROD ROTATABLY MOUNTED IN EACH PAIR OF ARMS AND EACH ROD HAVING A PULLEY SECURED THERETO, A FRICTION WHEEL ROTATABLY MOUNTED IN THE PLATES

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