US2247443A - Machine for use in the manufacture of shoes - Google Patents

Description

' ze'ss July 1, 1941. l R L W 0 2247.443

MACHINE FOR USE IN THE MANUFACTURE OF SHOES Filed Sept. 5, 1940 3 Sheets-Sheet l 2, Q o Y s 6 64 60 O Q l O I; 62 40 2 E: 6\ e 55 2 24 Q 52 5 :5 O 48 July 1', 1941. R. H. LAWSON MACHINE FOR USE IN THE MANUFACTURE OF SHOES Filed Sept. 5, 1940 3 Sheets-Sheet 2 July 1, 1941. R. H. LAWSON 3 Sheets-Sheet 3 Filed Sept. 5, 1940 hnwvwhn 4.. m ii MACHINE FOR USE IN THE MANUFACTURE OF SHOES Jmg; 1i-

Patented July 1, 1941 ETD STATES FFIQE MACHINE FOR USE IN THE MANUFACTURE OF SHOES Robert H. Lawson, Beverly, Mass, assignor to United Shoe Machinery Corporation, Borough of Flemington, N. J., a corporation of New Jersey Application September 5, 1940, Serial No. 355,431

7 Claims.

The present invention relates to machines for I trolling the relative positions of the jack and" operating devices as the point of operation of said devices is. transferred along the shoe. The several features of the invention are herein disclosed as embodied in an automatic side lastin machine and are intended primarily as improvements on the machines disclosed in applicants pending application Serial No. 311,794 filed December 30, 1939, and applicants Patent No. 2,201,866, dated May 21, 1940. It is to be underthe heavy actuated parts in a predetermined position. 7

As has been stated, the toggle of the machines of applicants patent and application referred to is broken by the return movement of the jack to operative position, and a further feature of the present invention contemplates the provision of lost motion in the connections between the toggle and the dash pot whereby the toggle is permitted to move from its straightened position without interference from the dash pct.

stood, however, that except where so stated in the claims, the several features of the present invention are not limited to use in any particular machines of the general type above referred to.

In the machine of applicants prior application an upward pressure on the jack during the operation on the shoe comprises a spring which, at the conclusion of the operation on the shoe is rendered inoperative and is locked out of operation spring is connected and which is arranged to be flexed more or less during the up and down movements of the jack during the operation on the shoe. This toggle, in addition to locking the spring connected to the jack out of operation, is also arranged to force the jack outwardly away from operating position at the conclusion of the operation on the shoe when the toggle is straightened, and is also arranged to be broken by the return of the jack inwardly to operative position.

The movement of the toggle to straightened position is produced through a lever and link connection from a face cam rotating in unison with the several pattern cams from which the relative positions of the operating devices and jack are controlled. This movement of the toggle is necessarily rapid and takes place during a small number of degrees of rotation of the pattern cam. On account of the weight of the parts and the necessary rapid movement, difficulty has been experienced in stopping the toggle accurately in straightened position without producing an objectionable shock and jar. To over-come this difliculty, a feature 'of the present invention contemplates the provision of a dash pot connected to the toggle and arranged to resist the movement of the toggle as it nears straightened position and. thereby absorb the shock occasioned by the sudden stopping of the rapid movement of .20 above referred to, the mechanism for exerting .25 by the straightening of a toggle to which the A further feature of the present invention relates to the construction and operation of the pattern earn from which the straightening movements are imparted to the toggle. Due to the small number of degrees through which the pattern cam can rotate in actuating the toggle and also due to the fact that the cam, before coming to rest, must rotate to a position permitting breaking of the toggle in starting the machine, the rise on the cams of the machines of the patent and application is quite steep, thereby occasioning a noticeable hard spot in the actuating mechanism of the machines. To relieve this hard spot in the actuation of the toggle, this feature of the present invention contemplates providing the toggle actuating pattern cam with a movable section having a limited movement with relation to the cam and arranged to be engaged and moved by the follower forming part of the connections to the toggle and during such limited movement to impart a toggle actuating movement to the follower.

In the construction hereinafter described, the continued movement of the movable section of the cam is utilized to complete thetoggle actuating movement of the follower. As the toggle reaches a straightened position, further actuation of the follower becomes unnecessary, and in order to permit the maximum number of degrees of cam rotation to be utilized before the cam stops in a position to permit movement of the toggle in staiting the machine, the cam surface of the section is so shaped that a return movement is permitted to the section and a spring is provided for imparting such return movement.

In the preferred form of this feature of the invention the movable cam section consists of a lever pivotally mounted on the toggle actuating pattern cam for limited swinging movement about an axis parallel to the axis of the cam, the outer end of the lever being arranged to engage the follower of the connections to the toggle, and suitable stops being provided to limit the movement of the lever in both directions.

The several features of the present invention will be readily understood by those skilled in the art from the following specific. description taken in connection with the accompanying drawings, in which is illustrated so much of an automatic side lasting machine as is necessary to show the connection of the invention therewith.

Referring to the drawings, Fig. 1 is a view in side elevation of the machine with portions of the frame broken away to show underlying parts;

Fig. 2 is a view in side elevation on an enlarged scale of a portion of the toggle actuating mecha nism and the connections from the toggle to the dash pot; Fig. 3 is a. View in side elevation of a portion of the mechanism illustrated in Fig. 2 but looking in the opposite direction and showing the dash pot in section and also showing the pattern cam from which the toggle is actuated; Fig. 4 is a plan view of the parts illustrated in Fig. 3; Fig. 5 is a detail vertical sectional View of the dash pot taken on the line 5$5 of Fig. 3; Fig. 6 is a detail sectional plan view on the line 6-6 of Fig. '7 illustrating the toggle actuating pattern cam with its movable section and the follower engaged thereby; and Fig. 7 is a View in sideelevation of the parts illustrated in Fig. 6.

The automatic side lasting machine illustrated in the drawings is the same, except as hereinafter indicated, as the machine disclosed in applicants prior Patent No. 2,201,866, and more particularly as disclosed in applicants co-pending application, Serial No. 311,794, hereinbefore referred to.

' Referring to 1, the lasting units of the machine are indicated at 2, and the operating cam shaft at '4. One of the pattern cams is shown 'at Band the shoe supporting jack at 8. The

shaft Wis driven from a motor I 9 through the driving belt and connections illustrated in Fig. ll 'At each actuation of the lasting and feeding devices from the shaft 4, the pattern cam shaft 2!] arranged to act on a plate 22 secured with the shoe supporting jack 8.

' During the operation of lasting the shoe, the

jack is continually forced upwardly by means of a spring 24, arranged 'to eirert an upward pressure on the lever 26, the free end of which is connected by a cord 28 to a vertically movable portion of the jack. Prior to the outward movement of the jack at the end of the lasting operation, the upward pressure of the spring 24 on the vertically movable portion of the jack is relieved, as in the machine of the patent and application, this result 'being'accornplished during the straightening movement of the toggle by the engagement of a set-screw 30 on a lever 32 to which the lower toggle lever [B is connected with a lug '34 on the lever 26.

In the machine of the patent and application, the toggle members [4 and I6 are straightened through lever and link connections from a pattern cam on the intermittently actuated pattern "camshaft 6. As has been stated, movement of the toggle to 'a'straighten'ed position is necessarily jectionable shock or jar.

The pattern cam rapid and takes place during a small number of degrees of rotation of the pattern cam. To stop the members of the toggle accurately in straightened position, the machines of the patent and application are provided with abutments or other devices cooperating with the slide 20. In utilizing such devices, however, it was found difiicult to bring the parts of the toggle accurately to straightened position without producing an ob- In the present machine; the same connections between the pattern cam and the toggle members are provided for actuating the toggle, and in order to absorb any shockrorjar, va dash pot is connected to the toggle members and arranged to resist the movement of the toggle members as they near straightened position. As illustrated, the toggle members i4 and [6 are actuated from a pattern cam on the shaft 6 through a pivoted lever 36, provided at its upper end with a yielding arm 38 connected to the member it of the toggle by a link '46. This arrangement, as in the machine of the patent and application, permits the toggle to' flex slightly during the lasting operation as the shoe supporting jack moves up and down.

The dash pot which absorbs the shock as the toggle members 14 and I6 reach a straightened position comprises a casing 42 formed with a cylinder 44 in which is mounted a vertically reciprocating piston 46. The lower end of the cylinder 44 is closed by a plug 48 and is provided in its side wall with two perforations 50 and 52 located one abovethe other and connecting with a chamber 54. For convenience of manufacture, the chamber 54 is formed partly-in a removable portion 56 ofthe casing, between which and the main portion of the casing a gasket 58 is interposed. The plunger '46 extends'upwardly beyond the casing "42 and is connected to the horizontal arm'of a bell crank lever 60, the verticalarm of which is pivotally connected at its upper end to a rod 62. The rod "62' passes through a block 64 pivotally mounted on the upper member 14 of the toggle, and is provided at its free end with an abutment collar 66, the construction being such that as the toggle members 14 and I6 approach straightened position, the block 64 contacts with theblock 66 and through the rod 62 and bell crank lever 69 depresses the plunger 46 in the cylinder 44, The downward movement of the plunger 46 in the cylinder 44 acts as a shock absorbing dash pot, the downward movement of the piston forcing oil first through both openings 5a and 52 into the chamber 54, then through the opening 52 alone, and finally coming to rest as the lower end of the piston passes below the opening 52'. To easethe suddenness of this stoppage of the plunger 45, the plunger at its lower end oDDOsi- tethe openings 50 and 52 is provided with a slightlyv bevelled portion indicated at 68.

While other forms'oi dash pot might be utilized, the dash oot-illustrated has been found to operate satisfactorily, and accordingly it is pre- 'ferred.'; V

In addition to the features already described, the dash pot oomprises a chamber 10 in the removable portion-56 of the casing separated from the chamber 54 by a ibaiile rib 12 and connecting with a chamber H formed in the main portion of the casing 42 The rib '72 separating the chamberst l-and m terminates slightly short of a rib on the main portion of the casing so as to leave a slit through whicho'il forced into the .chamberfi t during the downward movement of -theplunger 46 can escape into the chambers 70 and 14. To vent the chambers H1 and, M the gasket 58 is provided with an opening 16 communicating with a channel 78 leading to the outside of the casing. Oil escaping from the top of the cylinder M is allowed to return through'the channel 18. i

As has been stated, the toggle members [4 and I6 are moved from their straightened position upon starting the machine by the inward movement of the jack to operative position. To permit the toggle to be broken without interference from the dash pot, the block 64 is permitted to slide on the rod 62 for some distance without actuating the dash pot plunger, and thereafter the plunger is raised to itsoriginal position by the contact of the block 64 with a spring 80 surrounding the rod and interposed between the block and a collar 82 on the rod.

The novel and improved pattern cam of the present machine for actuating the toggle members It and It comprises a cam disk 84 secured to the shaft 6 and a movable section in the form of a lever 86 pivotally mounted upon the disk. The lever 86 is U-shaped, with the two legs of the U extending on opposite sides of the cam disk and with the closed end of the U extending beyond the periphery of the disk, where it is provided with a shallow notch 88 and with a cam surface 86 located to engage a follower 92 at the lower end of the lever 36 which, as has been described, is connected at its upper end to the toggle link It. The lever 86 is pivotally mounted intermediate its ends on an axis parallel to the axis of the cam disk 84 and is limited in its movement in one direction by the engagement of the outer end of the lever with a shoulder 94 on the periphery of the cam disk and in the opposite direction by the engagement of the inner end of the lever with the hub of the disk. A spring 96, coiled around the ends of the pivot pin of the lever, extending across the outer end of the lever and bearing at its inner ends against the hub of the cam disk, tends to hold the lever with its outer end against the shoulder 9:1, as illustrated in Fig. 3. During the greater part of the operation on the shoe, the lever 85 is out of contact with the follower 94. As the cam disk a l makes its next to the last intermittent movement, however, the notch 88 of the lever moves into engagement with the follower, as illustrated in Fig. 3. During the next and final movement of the cam disk, the lever 85 is first swung about its pivot, thereby forcing the follower outwardly on account of the crank effect of the pivot of the lever, and thereafter the lever moves with the cam disk and by means of the surface 90 at the outer end of the lever completes the outward movement of the follower. The surface 90 is so shaped that as the cam disk completes its movement the pressure of the follower 92 against the surface is relieved and the lever is permitted to return to its original position, in which it is out of the path of the follower when the toggle members are moved from straightened position in starting the machine.

The nature and scope of the present invention having been indicated and a specific embodiment of the several features of the invention having been described, what is claimed is:

1. A machine for use in the manufacture of shoes having, in combination, devices for performing an operation progressively along the bottom margin of a shoe, an operating cam shaft and connections for actuating said devices, a shoe supporting jack, means including'a spring exerting an upward pressure on the jack to force the shoe towards said devices, a toggle connected to the spring and arranged to be flexed by the up and down movements of the jack, a pattern cam acting at the completion ofthe operation on the shoe to straighten the toggle and thereby render the spring inoperative and lock the spring out of operation, and a dash pot connected to the toggle arranged to resist the movement of the toggle as it nears straightened position.

2. A machine for use in the manufacture of shoes having, in combination, devices for performing an operation progressively along the bottom margin of a shoe, an operating cam shaft and connections for actuating said devices, a shoe supporting jack, means including a spring exerting an upward pressure on the jack toforoe the shoe towards said devices, a toggle connected to the spring and arranged to be flexed by the up and down movements of the jack, a pattern cam acting at the completion of the operation on the shoe to straighten the toggle and thereby render the spring inoperative and lock the spring out of operation, a dash pot, and a lost motion connection between the toggle and the dash pot to cause the dash pot to resist the movement of the toggle as it nears straightened position and permit movement of the toggle from straightened position independently of the dash pot.

3. A machine for use in the manufacture of shoes having, in combination, devices for performing an operation progressively along the bottom margin of a shoe, an operating cam shaft and connections for actuating said devices, a shoe supporting jack, means including a spring exerting an upward pressure on the jack to force the shoe towards said devices, a toggle connected to the spring and arranged to be flexed by the up and down movements of the jack, and means acting at the completion of the operation on the shoe to straighten the toggle and thereby render the spring inoperative and lock the spring out of operation comprising a follower, and a pattern cam provided with a follower engaging section movable on the cam by engagement with the follower to impart a toggle actuating movement to the follower and thereafter movable with the cam to complete the toggle actuating movement of the follower.

4. A machine for use in the manufacture of shoes having, in combination, devices for performing an operation progressively along the bottom margin of a shoe, an operating cam shaft and connections for actuating said devices, a shoe supporting jack, means including a spring exerting an upward pressure on the jack to force the shoe towards said devices, a toggle connected to the spring and arranged to be flexed by the up and down movements of the jack, and means acting at the completion of the operation on the shoe to straighten the toggle and thereby render the spring inoperative and lock the spring out of operation comprising a follower, and a pattern cam provided with a follower engaging section movable on the cam by engagement with the follower to impart a toggle actuating movement to the follower.

5. A machine for use in the manufacture of shoes having, in combination, devices for performing an operation progressively along the bottom margin of a shoe, an operating cam shaft and connections for actuating said devices, a

shoe supporting jack, means including a spring exerting an upward pressure on the jack to force the shoe-towards said devices, a toggle connected to the spring and arranged to be flexed by the up and down movements of the jack, and means actingat the completion of the operation on the shoe to straighten the toggle and thereby render the spring inoperative and lock the spring out of operation comprising a follower, and a pattern cam having pivotally mounted thereon for limited swinging movement about an axis parallel to the axis of the cam a lever provided with a follower engaging surface at its outer end and arranged to be swung by engagement with the follower to impart a toggle actuating movement to the follower and thereafter during its movement with the cam to complete the toggle actuating movement of the follower.

6.A machine for use in the manufacture of shoes having, in combination, devices for performing an operation progressively along the bottom margin of a shoe, an operating cam shaft and connections for actuating said devices, a

shoe supporting jack, means including a spring exerting an upward pressure on the jack to force the shoe towards said devices, a toggle connected to the spring and arranged to be flexed by the up and down movements of the jack, and means acting at the completion of the operation on the shoe to straighten the toggle and thereby render the spring inoperative and lock the spring out of operation comprising a follower, and a pattern cam having pivotally mounted thereon for limited swinging movement about an axis parallel "to the axis of the cam a lever provided with a shoes having, in combination, devices for performing an operation progressively along the bottom margin of a shoe, an operating cam shaft and connections for actuating said devices, a shoe supporting jack, means including a spring exerting an upward pressure on the jack to force the shoe towards said devices, a toggle connected to the spring and arranged to be flexed by the up and down movements of the jack, and means acting at the completion of the operation on the shoe to straighten the toggle and thereby render the spring inoperative and lock the spring out of operation comprising a follower, and a pattern cam provided with a follower engaging section movable on the cam by engagement with the follower to impart a toggle actuating movement to the follower and thereafter movable with the cam to complete the toggle actuating movement of the follower and a spring to impart a return movement to the follower engaging section to remove the section from the path of the return movement of the follower.

ROBERT H. LAWSON.

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