US2480828A - Rough rounding machine - Google Patents

Description

p 1949- c. w. BAKER 2,480,828

ROUGH ROUNDING MACHINE Filed Dec. 29, 1947 4 Sheets-Sheet 1 v A35 06 A94 /62 Z .204 .605 A90 M /&9

M 0 0 E5 M2 P 1949- c. w. BAKER 2,480,828

ROUGH ROUNDING MACHINE Filed D80. 29, 1947 Q 7 4 Sheets-Sheet 2 @y /u A lame p 1949- c. w. BAKER nouen noumame MACHINE 4 Sheets-Sheet 3 Filed Dec. 29, 1947 fiwenior' Com/Zn Mfiaker Sept. 6, 1949. c. w. BAKER v 2,480,828

ROUGH ROUNDING MACHINE Filed Dec. 29, 1947 4 Sheets-Sheet 4 & E

[nven for Com/[n 14 fiaker 5y 6's Patented Sept. 6, 1949 UNITED SL-TAT ES; PATENT OFFICE ROUGH: ROUNDINGI MACHINE Corwin W. Baker, Beverly, Massa, assignor' to United ShoeMachihery Corporation; Flemington, N.- J a; corporation of New Jersey ApplicatiorrDecember 29, 1947', Serial No. 794,258,

1 This invention relates to machines for rough rounding shoe soles, the illustrated machine being. similar to that disclosed. in Letters Patent 1,030;- 606 granted on June 25, 1912,, upon. an applica, tion of H; Perry; but having a forepart and crease guide mechanism of the type disclosed in myprior application Serial No. 652,721 filed on March '7", 19461 More particularly, the present invention is concerned with improved means for toperating the f'orepart: guide in a machine of this its iswell understood by those familiar with. this type of machine and its operation, a shoe is under-the. control of the crease guide during, the. first and last parts of a rough rounding operation while the shank portion of theshoe is. being operated upon, and is under the control of. the.

forepart guide while the forepart of the shoe is being rounded. The forepart guide is moved into and out of operative position by. mechanism in. cluding a treadlewhich is held down by the operator throughout the period during which the shoe is under the control of'the forepart guide; and through connections between the forepart guide and crease guide the latter is moved into and; outv of. its operative position in alternation. with the.

forepart guide.

The forepart' guide in the machine, of my prior application referred to above comprises a cam,

like member against which the. shoe slides, at.

certain times. At such times this. member, al. though it. is mounted to rotate, is locked, against rotation by a releasable latch. When in round.- ing the forepart, it, is desired to vary the soleedgeextensi'on, this latch is released; whereby the. cam-like member is permitted to rotate in. re.-

sponse, to feeding movement of. the. shoe,. and. the: eccentricity or the cam-like, member causes the shoe to be moved heightwise, relatively to the. knife whereby the desired variation in the ex;- tension is made. This type of mechanism by which the forepart extension is varied is. com-- monly called a Baltimore attachment,. andt'he. above-mentioned Perry machine comprises such.

an attachment although it is diiierent structurally from that briefly described above. However,,it istrue of both the machines referred t0,,

and of this type of machine generally, that the operator is required, while holding down. the.

treadl'e which] operates the i'orepart guide, to actuate another member, usually a knee pad, to the operation of the Baltimore attachment;

The above-mentioned treadle and knee pad are operated. by the operators left foot and leg; respectively. It is. evii'lent therefore, that theiopr Claims. (Cl. 1218'.)

erators' weight is supported for the most part byhis right leg and that" his body will sway slightly from side to side; in maintaining his bal-'- ance, depending upon the action: required ofthe I left leg in operating the treadl'e and knee pad.

This operationof the treadle and knee pad is fatiguing to the operator; and, tothe extent that it disturbs his balance, makes it the more di'fli' cult for the-operator to turn the shoe so thatthe trimmed" edge of the sole is always horizontal at the knife. Moreover; the operators" fatigue is detrimentar not only to his production but also to thequality'of his work: since it: tends to' resultinerratictimin'g'of the operation of the treadle" and knee: pad.

In. view oithe foregoing, itis: 8;; principal object, of the invention to: provide: an: improved round-.-

ing: machine inthe operation of which the physicali exertions required of the operator, in connection. with. the: operationof the forepart guide: and=Ba-lt-imore attachment, isreduced: to a. mini mum so that he: can give more attention than. formerlytoithe; guidingof the shoe-,a-nd to the timing: of: the operation: of the rorepart' guide.- and' Baltimore; attachment.

To: this end, andin. accordance with one fearture or their-mention, the illustrated machin is; providedwith power operated means for moving the forepart guide into and out of operative. posi-- tion, eachi-ofsuch movements. being initiated by only a momentary actuation by the. operator. of. an, operator controlled. member which responds.

toa. very slight. pressure. This power operated..

meansisv constructed and arranged to operate. in. difierent stagesone for each movement of the. forepartguide, each stage of. its operation. being initiated by, the operator and. thenautomatic-ally continued and stopped... In. another stage of. its

operation; intermediate between those referred to above and initiatedv by another.- momentary actuation of the same operator controlled meme berg. this: means; is; also. constructed. and arranged tcrelease the latch of the Baltimore attachment while.- continuing: to hold:- the forepart guide in its: operative; position.

It is nowevident that the above-described; mechanismin theillustrated machine relieves the: operator of'theformer practice of holding down for an extended period the treadle for operat'- ing the forepart guide. Infact, eachmovement of" the forepart guide and the operation of" the Baltimore attachment is initiated by the mo'-- mentary operation of only one opera-tor controlled member under knee pressure so light that 3 the operators position and balance are not disturbed.

In both a right and left shoe there is an abrupt change in the sole edge extension at the junction of the inside shank with the forepart, and a gradual change at the junction of the outside shank with the forepart. Therefore, in operating on either a right or left shoe two changes in the control of the shoe by the forepart and crease guides occur. the change at the inside of the shoe bein made abruptly and that at the outside being made gradually. With respect to each shoe, th first change occurs upon moving the forepart guide into its operative position, and the second upon moving this guide out of its operative position. Accordingly, the power operated means for operating the forepart guide in the illustrated machine is constructed and arranged, in accordance with another feature of the invention. to move the guide into and out of operative position at different rates. The foregoing paragraph deals with the operation on the forepart guide in conection with the roundingof one shoe. The operation of the forepart guide will now be considered with reference to its movement involved in operating upon successive shoes.

It is usual for the rounding operation to be carried out upon right and left shoes alternately, this being consistent with the general practice of regarding a run of shoes in terms of pairs throughout their manufacture, to insure the proper matching of the shoes of each pair. On a right shoe the rounding out is started'at the inside and proceeds toward the outside thereof; and on a left shoe it is made in the opposite di rection. Again having in mind the similar positions of the abrupt and gradual changes in the extension in right and left shoes, it is now evident that the order in which the abrupt and gradual changes in control of the shoe occur is reversed from one shoe to the next. Accordingly, the means for operating the forepart gage in the illustrated machine is further so constructed and arranged, in accordance with another feature of the invention, that successive movements of the forepart guide in the same direction occur at different rates. a 1

It will now be apparent that the movements of the forepart guide, although different in rate, take place at predetermined rates and during all.)

predetermined periods of time. These features insure uniformity in the rounding operation as between the shoes of a pair as well as in an entire run of shoes. since the operator is enabled to anticipate accurately the time when the operation of the power operated means for operating theforepart guide must be initiated in order that any movement of the guide will be carried out at the proper time.

In accordance with another feature of the 'invention the means for operating the forepart guide, as herein illustrated, comprises a cam which is so shaped and arranged as to provide the desired sequence, direction, and rate of all movements of the guide as stated above. Invention is also to be recognized in novel control means for starting and stopping the operation of the cam, once for each stage of its operation.

These and other features of the invention will now be further described in the following specification and will be pointed out in the appended claims.

In the drawings,

Fig. 1 is a side elevation of an illustrative machine embodying the invention;

Fig. 2 is an enlarged side elevation of a part of the head of the machine and showing its prin-- cipal operating members and work guides;

Fig. 3 is a front elevation showing only the forepart guide of Fig. 2 and as viewed perpendicularly thereto;

Fig. 4 is a front elevation of part of the power-operated means for operating the forepart guide;

Fig. 5 is a sectional side elevation of a part of the mechanism of Fig. l, the section being taken along the line V-V in that figure;

Fig. 6 is a fragmentary plan view of a switch andoperating means therefor, the switch being shown in dotted lines in Fig. 4 and being a part of the operating means for the latch of the forepart guide;

Fig. '7 is a fragmentary sectional front elevation of a part of the operating means for the switch which starts and stops the operation of the structure illustrated in Fig. 4, the section being taken along the line VIIVII in Fig. 5;

Fig. 8 is a diagrammatical view illustrating the use and operation of the forepart guide during a rounding operation upon a right shoe;

Fig. 9 is a view similar to Fig. 8 but pertaining to a rounding operation upon a left shoe;

Fig. 10 is a diagrammatical view indicating the positions of the cam for operating the forepart guide and of the switch operating cam at the beginning and end of each stage of their operation during a rounding operation upon a right shoe; and

Fig. 11 is a diagrammatical view similar to Fig. 10 but pertaining to a rounding operation upon a left shoe.

The illustrated machine comprises a base Ill (Fig. 1) upon and above which there is mounted an operating head l2, similar to that of the machine disclosed in the above-mentioned Perry patent, and having as its principal operating members a bottom rest [4, an anvil l6 and a knife 48. The sole edge of a shoe to be rounded is received between the bottom rest l4 and the anvil l5, these members being oscillated to and fro to feed the work, such feeding movement occurring when the bottom rest and anvil swing together toward the left (the machine being viewed from the operators station in front of the machine). During the backward stroke of the anvil l6 its movement is momentarily interrupted, at which time the knife 18 cuts through the sole against the anvil. While the knife is in the work the bottom rest [4 is moved backwardly and during this time a channel is cut in the work by a knife carried by the bottom rest. The above briefly describes the cutting and feeding action of the machine, a more complete understanding of which, as well as of the construction and operation of the above-mentioned principal members of the machine, may be obtained from the Perry patent.

In order to determine the distance from the upper at which the sole edge is trimmed, i. e., the sole edge extension, the position of the shoe .heightwise of the knife [8 is controlled and varied at different times by either a crease guide 20 or a forepart guide 22. These guides as illustrated herein, and the mechanism which connects them, are similar to the corresponding structure of the machines disclosed in my above-mentioned application and another application .Serial No.

779,378, filed on October 11, 1947, also in my name.

As is well understood in this art, the crease guide controls the shoe when the knife is op erating at the inner and outer shank portions of the shoe; and the forepart guide 22' controls the shoe while the knife is operating around the forepart. The iorepart guide 22 is carried by a lever 25, which, through connections be.- tween it and another lever 26, is swung in a clockwise direction to lower the forepart guide 22 into itsoperative position. During such movement of the forepart guide the crease gu-id'e 20 is raised, first gradually and then abruptly, out of its operati've position, this movement of the crease guide recurring at a predetermined time and rate and being under the control of mechanism including an abutment roll 28 and a cam 30 engagingthe roll. This cam is mounted upon a lever 32 to which the crease guide 20 is attached. A spring 34 is tensioned in response to downward movement of the forepart guide 22, and assists in elevating the iorepart guide, both movements of which are derived from power-operated mechanism for operating the lever 26. As the forepart guide 22 rises, incident to transferring control of the shoe to the crease guide 20, the latter is abruptly brought near to its operating position and then is gradually lowered into its operative position. It is during this latter movement of the crease guide that the control of the shoe is transferred to it from the forepart guide.

The forepart guide 22 illustrated herein is similar to, but a simplification of, the forepart guide disclosed in my above-mentioned prior application Serial No. 652,721. It will be described below briefly, however, in order to facilitate the description to fellow of its relation to the means for op erating it, with which the invention is particularly concerned. Extending upwardly from the lever 24 (Fig. 2) is a projection 35 to the opposite sides of which are fixed plates 38. The projection and plates form a slideway for a slide 66 from which extends downwardly an arm 42, at the lower end of which the body 44 of the forepart guide is rotatably mounted upon a stud 46 fixed to the arm. The guide body has a central guide member 48 integral therewith and carries, one at each side of the central guide member, a leading guide member Eli and a trailing guide member 52. All three guide members can be adjusted together, heightwise of the knife [8, by turning a thumb screw 54 which is threaded into the upper end of the slide 4% and bears against the upper end of the projection 3%. A spring 56 coiled around the screw 5 and interposed between the slide and projection 35 urges the slide downwardly, holding the screw seated on the projection. The slide is clamped in adjusted position by setting up a thumb screw 58 which is threaded into the projection 36 and extends through an elongated slot 63 in the slide, the slot being arranged to permit thedesired adjustment of the slide. The leading and trailing guide members 50, 52 are mounted for angular adjustment on the guide body 44 and swing for this purpose about axes at their inner ends adjacent to the central guide member 58. Each of the guide members 50, 52 is fixed to an arcuate dovetail slide 62 which is adapted to move in a slideway 64, shaped concentric with the inner end of the associated guide member, in a wing 66, one extending from the guide body 44 at each side thereof adjacent to the guide member 48. Each slide has pivoted thereto a link 68 which is pivoted to the upper arm of a bell crank lever H1, each lever being pivotally mounted upon the guide body 44 on a screw 12. The lower arms of the bell crank levers 10' ride in a channel in a block 14 which is arranged to slide radially of the guide body in a slot 16 formed therein. A thumb screw 18 threaded into the block 14 and bearing against the front face of the guide body is arranged to clamp the block in adjusted position. It is now evident that by adjusting the block in its slot the guide members 50, 52 are simultaneously adjusted by equal amounts. The effect of this adjustment is to vary the eccentricity of the guide members 58', 52, it being understood that their outer ends will usually; if not always, be nearer to the axis of the stud 36 than their inner adjacent ends as indicated by the arcs in broken lines (Fig; 3) drawn on the radius of the central guiding member 48.

Like my prior forepart guide, the present one is constructed so that it is locked against rotation about the stud it in its initial and central positions by a latch 83, the latch also being arranged to prevent the guide from being moved beyond its final position. When the guide is in its central position the latch isreceived in a recess 82 formed in the guide body 44, the central guide member d8 being directly below the stud 46 at this time. The latch slides vertically in a recess 84 formed in the slide 45!. The recess 84 also receives a spring 85 which urges the latch toward the guide body 54. The latch can be moved away from the guide body by the lower arm of a bell crank lever 88 which is pivoted by means of a screw 98 on the lever 24. This bell crank lever is operated, as will be described later, by a solenoid 92 the plunger 94 of which is connected to the bell crank lever. by a link 93, the outer end of the link having a slot 98' which receives a pin I00 carried by the ilever. A spring 99 stretched between the plunger 94 and the projection 36 causes the lever 88 to be normally held out of engagement with the latch 89. With the forepart guide in its initial position the leading guide member 50 at W2 is down, directly underneath the axis of the stud 16. The guide is releasably held in this position by the latch 80 which is adapted to be received in a recess li l in a stop )6 which is mounted on the guide body 44 for adjustment about its periphery. This stop is slotted to receive a set screw 08 threaded into the guide body and by which the stop can be clamped in any adjusted position. Another similar stop I Iii, having a shoulder H2 adapted to be engaged by one side of the latch 8t, determines the final position of the guide. The stop [It is also mounted for adjustment about the periphery of the gage body 44 and is adapted to be clamped thereto by a set screw H4. A spring H5 mounted in an annular channel H6 in the guide body 44 resists clockwise turning of the forepart guide, and returns the gage from final position. to its initial position when the gage is released near the completion of a rounding operation upon a left shoe as will be described below. This spring is stretched between two pins, one pin H1 being fixed to the arm 42 and the other being fixed to the guide body 44.

Before proceeding with the description of the mechanism for operating the forepart gage, the

use and operation of the machine will next be described with reference to the rough rounding of the right and left shoes of a pair which is illustrated diagrammatically in Figs. 8 and 9.

This operation upon a right shoe is begun near the inside heel breast line approximately at H8 .(Fig. 8a), the shoe at this time being under the control of the crease guide 20. The shoe is fed by the machine toward the left and the operator turns the shoe throughout its feeding movement so that the trimmed edge at the point of operation of the knife is always horizontal. By the time the operation has proceeded about to the inside ball line the shoe will have the position illustrated in Fig. 8a, the forepart guide 22 being raised and in its initial position, that is, swung to the extreme of its counterclockwise rotation, the latch 80 holding it in this position by engagement with the stop I06. At this time it is desired that the control of the shoe be transferred from the crease guide to the forepart guide and, accordingly. the forepart guide is lowered into engagement with the shoe at I22, the crease guide being simultaneously retracted. This transfer of the control of the shoe from one guide to the other is carried out without interrupting the feeding movement of the shoe.

As the rounding of the forepart proceeds, the shoe is turned as required by its changing con tour, the shoe also being held against the leading guide member 50 against which the shoe slides until the point of operation of the knife approaches the outside tip line. At this point, such as approximately at I22 (Fig. 8b), the latch 80 is released, whereupon with further feeding movement of the shoe the gage member 50 rolls upon the shoe, freely rotating about the stud 46. Since the effective radius or eccentricity of the guide member 55 gradually increases as the point of its engagement with the shoe approaches the central guide member 48, the sole edge extension will be gradually increased because the shoe is being moved downwardly away from the knife. When the point of operation of the knife reaches the vicinity of the outside ball line as at I23 the latch 88 is received within the notch 82 and rotation of the forepart guide is stopped. The guide is now in its central position which causes the maximum sole extension to be formed upon the shoe. The shoe now slides on the central guide member 48, and as the point of operation of the tool goes into the outside shank, the crease guide 20 is gradually brought into engagement with the shoe while the forepart guide is gradually moved away from the shoe as at I24 (Fig. 8c). The rounding out is now continued with the shoe under the control of the crease guide and is completed at the outer heel breast line as at I25.

In this manner is the variable sole edge extension formed upon the shoe, it being relatively narrow the shank at each side thereof, and wider around the forepart, there also being smooth transitions between the different extensions where the changes in them occur. It is further apparent that the forepart extension reaches a maximum in the vicinity of the outside ball line, and that the extension gradually increases from a lesser extension toward this maximum from each side thereof. This style of edge is commonly called a Baltimore edge, and it is therefore appropriate to refer to the illustrated forepart guide as a Baltimore attachment since its rotatable mounting on the stud 4B and the eccentricity of its guiding members 50 and 52 produce such an edge.

In operating upon a left shoe the operation is started at the outside heel breast line approximately at I25 (Fig. 9a), the shoe being under the control of the crease guide 2d. operation of the knife approaches the outside ball line the forepart guide is lowered into engagement with the shoe as at I28, the crease guide As the point of r being gradually retracted from the shoe at the same time. When the forepart guide first engages the left shoe its central guide member 48 is used, the shoe being slid against this guide member until the point where the extension is to be the maximum is brought to the knife. At this point, for example, at I 30 (Fig. 9b), the latch is released and as the feeding of the shoe proceeds the trailing guide member 52 rolls on the shoe, the guide member rotating freely about the stud 46 until the shoulder I I2 on the stop I II] engages the latch 80. At this time, a point on the sole edge near the outside tip line, as at I32, will have been brought to the knife, and from this point the shoe is slid in engagement with the outer end of the trailing guide member 52 until a point near the inner ball line has been brought to the knife. At this point, as at I34 (Fig. 9c), the forepart guide is raised from the shoe and the crease guide is lowered to take over the control of the shoe. As soon as the forepart guide leaves contact with the shoe, it is automatically swung about the stud as into its initial position again, in which the point I02 on the leading guide member 50- is directly below the stud 46. With the shoe now under the control of the crease guide the rounding operation is continued throughout the inside shank until the inside heel breast line at I36 is reached.

The following is a description of the means for operating the forepart guide in the above. manner, with which is combined a statement of the operation of this means during the rounding of the right and left shoes of a pair.

The above-mentioned lever 26 for operating the forepart guide 22 is connected at its outer end to a rod I31 which corresponds to the rod 23 of the prior Perry machine. The rod I31 is power operated by mechanism comprising a lever I38 having rotatably mounted on its lower end a roll I39 adapted to engage the periphery of a cam I40. The outer end of the lever I38 carries an eyebolt I42 which bears against a collar I44 adapted to be adjusted along and fixed to the rod I31. The lever I38 is mounted to swing vertically on a stud I46 which is threaded into a boss on the base I9. The cam I40 is mounted to rotate in a bracket I 48 which is secured to a base plate I50, the latter being fixed to the base In of the machine. Associated with the cam I40 is a clutch element I52 into and out of engagement with which a second clutch element I54 is adapted to slide, the element I54 being splined to a drive shaft I55 which constantly rotates when the machine is in operation. This drive shaft extends from a gear reduction unit I58 which is fixed to the base plate I50 and which receives power through a pulley I50 over which runs a belt I62, the belt being driven by a motor-pulley I64.

The clutch element I54 is operated to start and stop the rotation of the cam I40 by mechanism including a lever I 66 which is pivoted at IE8 to a bracket I10 secured to the base plate I50. The lower end of the lever I66 carries a pin I12 which ;is received in a slot I14 in a link I16 which is pivoted by means of a screw I11 to the plunger I13 of a solenoid I89. This solenoid is energized, to cause the clutch elements to be engaged, by the closing of a switch I82 which is connected in series with the solenoid and a source of power. When the switch is opened the clutch elements are disengaged by the action of a tension spring I84 which is stretched between a stud I85 fixed to the bottom of the base plate I50 and the screw I11.

The switch 182 is closed in response to an inward movement of .a knee pad .IBB-Whibh. is

mounted on a member 1 ail-at a height convenient to be engaged by the operators knee. This member is pivotally mounted toa swing with-a parallel motion upon a link .i92 and the upper .arm of .a bell crank lever I94, the link being rotatably mounted on the abovee-mentionedistud14d. The bell crank lever $94 is mounted to rotate on a stud I96 which is threaded into .a boss on the base Ill. Movementof the member I96 is limited by avscrew l9! which is .threaded into the base and is adapted to be engaged by shoulders :at the opposite ends .of a recess formed'in-the member. In the lower arm of the lever LS4 is fixed .a pin 1955 which overliesanother pin 22% .fixed to the upper arm of a bell crank 202 which: ismounted-to Swing on the .stud [96. Secured to :the lever 2.02 by means of .the pin 2.00 is a finger 2% the upper end of which is bent .over a plunger .206 by which the switch 1.82 is operated. The switch is fixed to an angle iron 1208 which is .mounted on the studs M6 and 1.96.

.Let it now be assumed thata right-shoeis to be rounderhthat the forepart guide 22 .is in its elevated inoperative position, and .thatthe cam Ml] isin the position illustrated in Figs. 1,5, and 10a. The operator presents the shoe to the machine and rounds the inside shank from the starting .point at HB (Fig. 8a) with the shoe under the control of the crease guide .20. When the point of operation of the tool reaches the point where the control of the shoe is tobe trans'ferredto the forepart guide, as at 120, the operator presses upon the knee pad I88, which, through the connections described above, causes the switch 182 to be closed and the rotation of the'cam Mil (counterclockwise, Fig. 5) to be started. An abruptly rising slope 2H3 on the cam in passing the roll I39 causes the rod l3! to be lowered and-the forepart guide 22 to be'quickly-brought into operative position. The switch I82 is automatically held closed, immediately after it is first closed bythe operator, by a cam surface 2l2 on a cam 21-4 which is fixed to the inner side of the cam MB. The cam surface 2! 2 is adapted to bear against a roll2'l'6 which is rotatably mounted on the lower arm of the lever 202. A spring 2H5 is stretched between the lower ends of the levers I38 and 202 and holdstheir rolls I39, 2H5 in engagement with the cams 140 and 214, respectively. Thus, once the machine has been started by a momentary operation of the knee pad l 88, the cam -l 40 continues to rotate until the rising slope 210 has passedbeyond the .roll .I 39. At this time, a recess 2J8 in-the cam 2 HI permits the bell crank 202 to swing in a clockwise direction under the influence of the spring I2l'5 whereby the switch plunger 296 is released by the finger 2'04 and the circuit'for the solenoid I80 is opened. The clutch elements 152., -l54'are nowdisengaged and the cam IM] is stopped in the position illustrated in Fig. 101). With the cam 1-40 in this position the rounding operationon the right shoe is continued, the shoe being slid against the :-.tion :of the cam J40 begins, a small lug 224 (Figs.

5 and .6) on the outer side of the cam I40 engages :anddepresses the plunger 22.5 (Figs. 4 and .6) .of a

;SWitCh 2.28 which is electrically connected in series with the above mentioned solenoid 92 for op crating the latch of the forepart guide. The switch 228 is secured to a bracket 230 which is .fixed to the base plate i511, the switch being solo- .cated that itsplunger isat the same height as the axis of the cam M8 and in the path of the lug 2 24. As has been previously described, when the ,solenoid -92 is energized the latch 80 is retracted from the recess 82 in the body .44 of the forepart guide permitting the leading guide member 58 to rollon the shoe :in response to feeding movement thereof. The second stage in the operation of the cam M8 is terminated when a recess 232 in thecam 2! comes opposite to the roll 2H5 whereby the .lever 202 is again permitted to swing in a clockwise direction to .open the switch I82. At this time the .cam ass will have been moved to bring "the end of the concentric cam face 222 near to the 11011139 (Fig.

When the rounding operation has proceeded to :the point indicated by Fig. 8c, and it is desired to transfer the'control of the shoe fromthe forepart guide to the crease guide, the operator again strikes the knee pad H38, starting the third stage of operation of the cam H49. During this stage of itsoperation a gradually falling slope 236 on the cam it is moved past the roll J39 whereby the .forepart guide 22 ispermitted slowly to rise out of operative position. The operation of thecam I46 in this stageis maintained by the action of a concentric cam face 23-5 on the cam 2M and is terminated when a recess 238 comes opposite to the roll .216. With the crease guide as now in control of the shoe the rounding of the right shoe is completed at the outside shank. It will now be observed that the cam M8 is so designed as to move the forepart guide abruptly into its operative position during an operation upon a right shoe, and that the'guide is retracted from this shoe gradually at a different slower speed. Thus, the abrupt and gradual changes in the control of the shoe by the "guides are effected where the changes in the sole edge extension are abrupt and gradual, respectively.

Moreover, during the stage of operation of the cam Mt intermediate between those which cause the guide 22 to be moved into and out of operative position, the guide is held in its operative position and its latch is released to permit the rotation of the guide which produces the gradual increase in extension upto the maximum.

Considering now the rounding of a left shoe, the out is begun'near the outside heel breast line, as at I26 .(Fig. 9a.) the shoe being under the control of the crease guide 20 until the point of operation of the knife approaches the junction of the shank and forepart. When the control of the shoe by the crease guide is to be transferred to the forepart guide, as at MS (Fig 9a) the knee pad L88 is actuated again to start the rotation of the cam I40. During this first stage of its operation during the rounding of a left shoe a gradually rising cam face 240 (Fig. 11c) passes the roll 139 and :causes the iorepart guide 22 gradually to be lowered into engagement with the shoe. The switch IE2 is held closed throughoutwthis stage of operation of the cam Hit by the action of a concentric cam surface2i2 on the cam 2M whichengages the roll 2H5. This stage of the operation of the roam Mil is terminated when a-recessZM 11 comes opposite to the roll 2I6, as illustfate'din Fig. 11b, and the switch I82 is opened again.

With the shoe now in engagement with the center guiding member 48 it is fed past the tool, sliding on this guiding member, until a point'as at I30 (Fig. 9b) near the outer ball line is reached, where a gradual decrease in the extension is to begin. At this point the knee pad I88 is again actuated to start another stage in the operation of the cam I40 during which the forepart guide is held in its operative position by a concentric cam face 2 35 on the cam I40. Shortly after this stage of operation of the cam I40 begins, a second lug 248 on the outer side of the cam strikes the plunger 226 of the switch 228 thereby closing the circuit to the solenoid 92 which causes the latch an to be retracted from the recess 82. The operation of the cam Hill is maintained throughout this stage by a concentric cam surface 249 on the cam 2M and is terminated when the roll 2I6 falls into a recess 250 in the same cam, as illustrated in Fig. 110. Upon the release of the latch 80 in the above described manner, and with further feeding movement of the shoe, the trailing guiding member 52 rolls on the shoe causing the sole edge extension to be gradually diminished until the latch engages the shoulder II2 on the stop I I0. At this time a point on the trailing guide member 52, as at 252, is directly below the stud 46 and engages the shoe at I32 (Fig. 9b). After the rotation of the guide member 52 has thus been stopped, the shoe is slid against the guide member to advance the cut around the forepart substantially to the inner ball line as at I34 (Fig. 10c). At this point by again operating the knee pad I88 the final stage of operation of the cam M8 is started during which an abruptly falling cam surface 254 on the cam ma moves past the roll I39, permitting the rod I3! and hence the forepart guide 22 to rise rapidly. This final stage of operation of the cam M is continued by a concentric cam surface 256 on the cam 2M and is terminated when the roll 2 I6 falls into a recess 258 in the cam 2 I4 as illustrated in Fig. 1141.

It will now be observed that during the rounding operation upon a left shoe the forepart guide is moved into operative position gradually, rather than abruptly as in the case of the right shoe, the guide also being moved abruptly out of operative position when control of the shoe is taken over by the crease guide. Such operation of the forepart guide is consistent with the fact that in operating upon a left shoe the gradual and abrupt changes in extension are made in that order, the reverse of the order in which they occur in operating upon a right shoe.

Briefly to summarize the operation of the illustrated machine, in operating upon a right shoe the operator operates the knee pad i88 momentarily three times to initiate difierent stages of the operation of the cam I48. In the first stage the forepart guide 22 is moved abruptly into operative position to take over the control of the shoe from the crease guide. In the second stage, during which the forepart guide is held in its operative position, the latch 82 is released permitting rotation of the forepart guide for the purpose of causing the extension to be increased gradually to the maximum. In the third stage, the forepart guide is gradually moved out of its operative position giving over the control of the shoe to the crease guide 28. Thus durin the operation upon a right shoe, the cam I40 moves through a half-revolution in three stages, its operation in each stage being automatically con- 12. tinned and terminated by the cam 2H and the mechanism operated thereby.

Similarly in operating upon a left shoe, the knee pad I88 is momentarily actuated, first, to cause the forepart guide 22 gradually to take over the control of the shoe from the crease guide; second, to release the latch 82 whereby the extension is gradually diminished from the maximum; and third, to cause the forepart guide to be abruptly moved out of operative position whereby control of the shoe is given over to the crease guide again. As before, once each stage of operation of the cam I48 is initiated it is automatically continued and terminated under the control of the cam 2I4.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is: i

1. In a rounding machine, with a roundin tool and a guide for positioning a shoe relatively to the too], said guide being mounted for movement into and out of operative position, in combination, power operated mechanism for advancing said guide into and retracting it from its operative position, operator controlled means for starting-the operation of said mechanism, and means for stopping said mechanism when said guide reaches the end of each of its movements.

2. In a rounding machine, with a rounding tool and a guide for positioning a shoe relatively to the tool, said guide being mounted for movement into and out of operative position, in combination, power operated mechanism for advancing said guide into its operative position at one speed and for retracting said guide from its operative position atanother speed, operator controlled means for starting the operation of said mechanism, and means for stopping said mechanism when said guide reaches the end of each of its movements.

3. In a rounding machine, with a rounding tool and a guide for positioning a shoe relatively to the tool, said guide being mounted for movement into and out of operative position, in combination, power operated mechanism for alternately advancing said guide into and retracting it from its operative position, said mechanism being constructed and arranged to cause successive movements of said guide in the same direction to occur at different speeds, operator controlled means for starting the operation of said mechanism, and means for stoppin said mechanism at the end of each movement of said guide.

4. In a rounding machine, with a rounding tool and a guide for positioning a shoe relatively to the tool, said guide being mounted for movement into and out of operative position, in combination, power operated mechanism for alternately advancing said guide into and retracting it from its operative position at different speeds, said mechanism also being constructed and arranged to cause successive movements of said guide in the same direction to occur at different speeds, operator controlled means for starting the operation of said mechanism, and means for stopping said mechanism at the end of each movement of said guide.

5. In a rounding machine, with a rounding tool and a guide for positioning a shoe relatively to the tool, said guide being mounted for movement into and out of operative position, in combination, power operated mechanism for advancing said guide into and retracting it from its operative position, operator controlled means for starting the operation of said mechanism, and means for stopping said mechanism when said guide reaches the end of each of its movements, said mechanism comprising a rotatable cam having a slope which rises at one rate from a predetermined level and a second slope which falls at another rate toward said level whereby the move-. ments of said guide into and out of operative position occur at different speeds.

6. In a rounding machine, with a rounding tool and a guide for positioning a shoe relatively to the tool, said guide being mounted for movement into and out of operative position, in combination, power operated mechanism for advancing said guide into and retracting it from its operative position, operator controlled means for starting the operation of said mechanism, and means for stopping said mechanism when said guide reaches the end of each of its movements, said mechanism comprising a rotatable cam having a pair of spaced slopes which rise at different rates and a second pair of slopes which fall at different rates, the slopes of each pair being contiguous to the slopes of the other at their lower levels, whereby successive movements of said guide in either direction occur at different rates.

7. In a rounding machine, with a rounding tool and a guide for positionin a shoe relatively to the tool, said guide being mounted for movement into and out of operative position, in combination, power operated mechanism for operating said guide, said mechanism being constructed and arranged successively to advance said guide into its operative position, hold said guide in its operative position for a predetermined period,

and retract said guide from its operative position, operator controlled means for starting each stage of operation of said mechanism, and means for automatically stopping the operation of said mechanism at the end of each stage thereof.

8. In a rounding machine, with a rounding tool and a guide for positioning a shoe relatively to the tool, said guide being mounted for movement into and out of operative position, in combination, power operated mechanism for operating said guide comprising a cam having rising and falling slopes and a concentric face between said slopes, said cam being operable in successive stages to cause said guide to be advanced into operative position, held therein, and retracted therefrom by said rising slope, concentric face, and falling slope respectively, operator controlled means for starting each stage of operation of said cam, and means for automatically stopping the operation of said cam at the end of each stage thereof.

9. In a rounding machine, with a rounding tool,

a guide for positioning a shoe relatively to the tool, said guide being mounted for movement into and out of operative position, said guide also being mounted to rotate about an axis with respect to which its work engaging surface is eccentric, and a latch for releasably holding said guide against rotation about said axis, in combination, power operated mechanism for operating said guide, said mechanism being operable in successive stages first to advance said guide into operative position, then to hold said guide in its operative position, and finally to retract said guide from its operative position, means constructed and arranged to release said latch from said guide while said guide is held in its operative position, operator controlled means for starting each stage of operation of said mechanism, and means for automatically stopping the operation of said mechanism at the end of each stage thereof.

10. In a rounding machine, with a rounding tool, a guide for positioning a shoe relatively to the tool, said guide being mounted for movement into and out of operative position, said guide also being mounted to rotate about an axis with respect to which its work engaging surface is eccentric, and a latch for releasably holding said guide against rotation about said axis, in combination, power operated mechanism for operating said guide comprising a cam having rising and falling slopes and a concentric face between said slopes, said cam being operable in successive stages to cause said guide to be advanced into operative position, held therein, and retracted therefrom by said rising slope, concentric face, and falling slope respectively, operating means for said latch, a member carried by said cam for actuating said latch operating means while said guide is held in its operative position, operator controlled means for starting each stage of operation of said cam, and means for stopping the operation of said cam at the end of each stage thereof.

CORWIN W. BAKER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 682,679 Fowler Sept. 17, 1901 723,468 Kiefier Mar. 24, 1903 FOREIGN PATENTS Number Country Date 7,659 Great Britain 1892

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