US2753709A - Skiving machines - Google Patents

Description

July 10, 1956 E. H. BECK 2,753,709

SKIVING MACHINES Filed Aug. 2, 1954 3 Sheets-Sheet l W//An /WW/// /3 Taffy-sys.

July 10, 1956 E. H. BECK SKIVING MACHINES Filed Aug. 2, 1954 3 Sheets-Sheet 2 July 10, 1956 E. H. BECK 2,753,709

SKIVING MACHINES Filed Aug. 2, 1954 3 Sheets-Sheet 3 F IGA.

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United States Patent O SKIVING MACHINES Edwin H. Beck, Lemay, Mo., Supplies Co., St. Louis, souri assigner to Manufacturers Mo., a corporation of Mis- This invention relates to skiving machines, and more particularly, to machines of the type disclosed in my copending application, now Patent Re. 23,982, granted April 19, 1955, of which this is a continuation-in-part.

Such a machine has a cylindric bell-shaped knife to which is work fed in an axial direction. The feed roll is resiliently supported beneath a work table, and a presser foot is mounted thereabove to guide the work, scarfs of differing shape being made by changing the position of the presser foot. Adjustment of the presser foot is somewhat critical, hence it was customary to operate the Inachine only when a considerable number of blanks were at hand. When a given blank, such as the upper of a shoe, required several different skiving operations, the machine was set to make one type of scarf, and all of the blanks were then run through, the machine then being readjusted, and all of the blanks again being run through to form a second scarf.

This practice was not entirely satisfactory, however, and it has therefore been proposed (in the above-mentioned application) that the machine be provided with treadle-operated mechanism for moving a presser foot from one predetermined position to another predetermined position. The particular arrangement suggested in the aforesaid application involved the use of normallyretracted actuating elements, which were adapted to be advanced mechanically by depressing associated treadles. When an actuating element was advanced against a stop, it engaged a pair of adjusting levers, one of which controlled the angle of the presser foot and the other of which controlled the elevation of the foot, set screws being provided on the actuating elements to vary the amount of movement of the presser foot.

When both actuating elements were retracted, the machine made one type of cut. When one of the treadles was depressed, the associated actuating element was advanced to prepare the machine for a different skiving operation. This treadle was then released and another treadle depressed to prepare for a third type of scarf, a third treadle being manipulated more or less continuously to control feed of the work. As such, the machine could make three different scarfs without lifting the work from the machine.

This arrangement works well in practice, but the operator must use both of his or her feet, one foot being occupied continuously with the feed-control treadle, and the other foot being moved intermittently from the floor to one and then the other of the two adjusting treadles. Accordingly, it is an object herein to provide a machine which is more convenient to operate, and especially to provide a machine wherein both the feed and the workguiding elements are controlled from a single treadle.

Briefly, these objectives are achieved by utilizing solenoids to advance the actuating elements, the solenoids being energized through switches mounted on the feedcontrol treadle. This treadle is adapted to permit the foot to be swung on its heel from the middle to one or and the switches are mounted is moved off center. More par* ticularly, a sole plate is pivoted to the treadle near the heel, and this sole plate may ride over a exible strap, the ends of which are somewhat elevated above the sole plate. Push-button switches are mounted beneath the strap, the sole plate being guided over the push buttons by the strap. As the sole plate is moved to one side, that portion of the strap is depressed to actuate the associated push button. Sensitivity of the plate is controlled by springs located beneath the ends of the strap and by threaded connectors which secure the ends of the strap over the springs.

Other features of the invention will be in part apparent from and in part pointed out in the following detail description taken in connection with the accompanying drawings, in which:

Fig. l is an end view illustrating certain skiving apparatus embodying the invention, parts being broken away;

Fig. 2 is a front view of the apparatus shown in Fig. l, parts being broken away;

Fig. 3 is a circuit diagram of certain elements of the invention;

Fig. 4 is a plan view 4-4 of Fig. l; and

Fig. 5 is an end View of the treadle taken on the line SkS of Fig. l.

Referring to the drawings, a skiving machine 1 is shown to be mounted on a work bench 3, the machine being driven by a power unit 5 hung beneath the bench and being controlled by a treadle generally designated 7. The machine has a housing, the upper portion 9 of which forms a work table. A bell-shaped knife 1l is mounted on a horizontal shaft 13 to project partially through the work table toward one end of the housing, and a feed roll 15 is supported at this end upon a yieldable upwardlybiased frame, part of which is shown at 17. Both the knife and the feed roll are driven from a pulley 19, which is affixed at the other end of the machine upon a shaft 21. This shaft is connected directly to the knife shaft 13 and carries a shive 23, by means of which power is transmitted through a lateral shaft at the back and a tlexible transverse coupling 27 to the feed roll (Fig. l). A belt 29 extends from the pulley 19 to a shive 31 of the drive unit 5.

The drive unit incorporates a continuously operating motor and an associated clutch, which is adapted to be engaged by deflection of a part 33 of a bell crank lever. For example, there may be a clutch plate 37, which is normally biased into a braking engagement with a portion 39 of the housing, but which is movable into engagement with a flywheel 35 coupled to the motor. The clutch plate 37 and shive 31 are afiixed at opposite ends of a shaft 41, bearings for which are carried in a sleevelike cage 43. The cage 43 is slidably held within a portion of the motor housing, and the lever 33 is also pivoted at 45 to this portion of the housing. Legs 44 project from the lever on opposite sides of the housing for actuating connection with studs 48, which project from the cage 43 through elongate openings 46 in the housing. The clutch is biased to its disengaged braking position by a spring 47, but is adapted to be closed by manipula` tion of the treadle 7, which is coupled by a connecting rod 49 to the lever 33.

The machine is also supplied with a presser foot 51, which is mounted over the work table to guide the work from the feed roll 15 against the knife 11. When used for edge-skiving purposes, the presser foot is provided with an edge guide 53. Otherwise the foot is pivoted at upon a rod 57, which telescopes within a sleeve 59 xed upon an arm 61 of the housing. The rod 57 is moved vertically (to vary the elevation of the presser the other sides thereof, for actuation as the foot of the treadle taken on the line foot) by means of a lever 63, which carries a first adjusting screw 65 in abutting engagementw ith the end of the rod 57. The angle of the presser foot relative to the knife is controlled by a second lever 67 fixed to the presser foot to extend generally beneath the lever 63, and a set screw 69 carried by the rod 57 provides for initial adjustment of this angle.

Additionally, the machine includes actuating elements 71 and 73 in the form of bars, which are telescopically contained by a portion 75 of the housing. Each of these bars carries an upper adjusting screw 77 for engagement with the elevating lever 63 and a lower screw 79 for engagement with the angle-adjusting lever 67. A spring (not shown) within the sleeve portion 59 of the housing biases the rod 57 upwardly, so that associated lever 63 is normally retracted against a stop 81. A spring S3 similarly biases the lever 67 to retracted position against the set screw 69.

Referring to Fig. 3, the actuating elements '71 and 73 are adapted to be moved to advanced positions by means of solenoids 85 and S7,v respectively, which would be contained within an enclosure 86 and coupled to the actuating elements. lt will be understood that the actuating elements are retracted by springs 92and that there are xed stops (not shown) determining the advanced and retracted positions of the actuating elements. The solenoids 85 and 87, in turn, are electrically connected by wires S9 to a supply source S through switches 91 and 93, respectively.

The switches 91 and 93 are of the normally-open pushbutton type and are mounted upon the feed-control treadle 7, as illustrated in Figs. 4 and 5. The treadle is pivoted at 95 upon a floor frame 97 and the connecting rod 49 is coupled to a rear bracket 99. A sole plate 101 is preferably mounted in overlying relationship with the body 103 of the treadle, and one end of the sole plate has a raised rib 105 for retaining the heel. The plate 101 is pivoted at this end upon a pin 107 so that the fore portion may be moved from the center position of Fig. 4 against the bias of springs 109. These springs are connected to a stud 111 which projects from the sole plate through a slot 113 in the treadle and to opposite sides of the body 103, thereby to bias the sole plate to a center position.

The fore portion of the sole plate carries upwardly projecting members 115, one of which may be adjustably positioned for cooperation with the sides of the operators foot. Otherwise, the sole plate rides upon aY relatively stiif but flexible strap 117, which extends across the treadle. rThe strap 117 is secured at its ends by threaded connectors 119, its ends being elevated by means of spring 121. The switches 91 and 93 are mounted beneath the body of the treadle and have actuating buttons 123 which project through the body toward the exible strap, the buttons 123 being located inwardly of the connectors 119. Stop pins 125V may be provided to limit movement of the sole plate and set screws 127 lock the threaded connectors 119.

In operation, the operators foot rests upon the sole plate 101 to control the relative pitch of the treadle and thereby feed of the Work. As the fore part of the foot is depressed, the clutch- 37 is engaged to drive the knife and feed roll. With the sole plate in its center position, both switches are opened so that the presser foot 51 is in its initial position for making a first scarf.

When a different cut is to be made, the operator moves the fore part of his foot off center, so as to depress the adjacent portion of the strap 117 and close the adjacent switch, the pitch of the treadle being controlled as before. When the switch is closed, the associated solenoid is energized to advance the associated actuating element against its stop; and as the actuating element. is advanced, the adjusting levers 63 and 67 are depressed to change the angle and elevation of the presser foot.

A third type of scarf is then made by swinging the foot to the other side of the treadle so that the other switch is closed and its solenoid energized.

It will be noted that the sensitivity of the treadle may be varied. As the connectors 119 are screwed downwardly, the adjacent portions of the strap 117 are brought into closer relationship with the switch actuating elements 123, so that a relatively slight movement of the sole plate to either side of the machine will result in actuation of the switches. in practice, the sensitivity of the treadle would be gradually increased as the operator became more experienced.

From the foregoing description, it is apparent that those skilled in the art will understand the structure, function and mode of operation of the invention herein disclosed, and appreciate the advantages thereof. Although one embodiment has been disclosed in detail, it is to be understood that the invention is not limited thereto, but the drawings and description thereof are to be understood as being merely illustrative. lt is realized that many modifications and variations will present themselves to those skilled in the art without departing from the spirit of this invention or the scope thereof as set forth in the appended claims.

Having thus described the invention, what is claimed and desired to be secured by Letters Patent is:

l. In a skiving machine of the type having a treadlecontrolled feedy and an adjustable presser foot for varying the character of the cut, the improvement comprising a solenoid mechanically coupled to actuate said presser foot and a solenoid-control switch mounted on the feed-control treadle.

2. In a skiving machine of the type having a treadlecontrolled work feed and a work-guiding member for varying the character of the cut, the improvement cornprising `an actuating element mounted for movement from a retracted position to an advance position to change the position of said work-guiding member, a solenoid Vmcchanically connected to advance said actuating element, and means including a normally-open switch for energizing said solenoid, said switch being mounted on the feed-control treadle.

3. Apparatus as set forth in claim 2, wherein said switch is located to one side of said treadle.

4. Apparatus as set forth in claim 2, further including a second` actuating element, a second solenoid associated with said actuating element, and a second switch for controlling energization of said second solenoid, said first switch being located for actuation at one side of the treadle and said second switch being located for actuation at the other side of said treadle.

5. in a skiving machine of the type having a treadlecontrolled feed and an adjustable presser foot for varying the character of the cut, the improvement comprising a solenoid mechanically coupled to actuate said presser foot and a solenoid-control switch mounted on the feedcontrol treadle, said switch having an actuating button, and guide means on said treadle for guiding the foot of an operator sidewise from a position clear of said button to a position for actuating cooperation with said button,

6. Apparatus as set forth in claim 5, further including a sole plate mounted on said treadle for movement toward and away from one side thereof, said sole plate being mounted for cooperation with said actuating button as it is moved toward said side of the treadle.

References Cited in the tile of this patent UNITED STATES PATENTS

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