US2421319A

US2421319A - Filament scraper

Info

Publication number: US2421319A
Application number: US522610A
Authority: US
Inventors: Jr John Ehret
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1944-02-16
Filing date: 1944-02-16
Publication date: 1947-05-27
Anticipated expiration: 1964-05-27

Description

May 27, 1947. J. EHRET, JR

FILAMENT SCRAPER Filed Feb. 16, 1944 5 Sheets-Sheet l a ME TT; N HE E vm m Nam. w

J. EHR ET, JR

FILAMENT SCRAPER Filed Feb. 16, 1944 5 Sheets-Sheet 3 \vIIII #vvavroE J fI/EEZJE.

QRMwd-M ATTORNEY May 27, 1947.

J, EHRET, JR

FILAMENT SCRAPER Filed Feb. 16, 1944 5 Sheets-Sheet 4 v J fl/EEZ J2.

.nrrolelvgx J. EHRET, JR FILAMENT SCRAPER Filed Feb. 16, 1944 5 Sheets-Sheet 5 Patented May 27, 1947 UNITED STATE PATENT OFFICE FILAMENT SCRAPER Application February 16, 1944, Serial No. 522,610

7 Claims.

This invention relates to material treating apparatus, and more particularly to apparatus for scraping given lengths of coating from coated filaments for use in vacuum tubes.

Vacuum tube filaments are generally cut from a strand or ribbon of suitable material coated, for example, with a barium-strontium mixture baked to a hard surface. The necessary treatment to condition such filaments for welding, to support wires of the mounting structures of the Various types of vacuum tubes, includes cutting of the filament material into definite lengths and removing the coating from the ends of each length.

An object of the invention is to provide a material treating apparatus which is highly efficient in treating filaments for vacuum tubes.

With this and other objects in view, the invention comprises a material treating apparatus having mechanisms to advance a covered material predetermined distances intermittently, scrape the cover for variable distances from opposite sides of the material at predetermined variable spaced distances, and sever the material at the scraped positions.

Other objects and advantages will be apparent from the following detailed description when considered in conjunction with the accompanying drawings, wherein Fig, l is a top plan view of the apparatus;

Fig. 2 illustrates a ribbon-type filament and the effect of the scraping units of the apparatus thereon;

Fig. 3 illustrates a strand-type filament and the eifect of the scraping units thereon;

Fig. 4 is a schematic illustration of the strandtype of filament material, illustrated in Fig. 3, being scraped:

Fig. 5 is a schematic illustration of the scraping of the ribbon-type of filament, illustrated in Fig. 2;

Fig. 6 is a front elevational view of the apparatus;

Fig. 7 is an enlarged fragmentary front elevational view of a portion of the structure shown in Fig. 6;

Fig. 8 is a fragmentary front elevational view of the material feeding unit;

Fig. 9 is a vertical sectional view of the feeding unit, this view being taken along the line 9-9 of Fi 8;

Fig. 10 is a fragmentary sectional view taken along the line |0l0 of Fig. 8;

Fig. 11 is a fragmentary front elevational view of the material gripping and shearing units;

Fig. 12 is a vertical sectional view taken along the line l2l2 of Fig. 11;

Fig. 13 is a fragmentary schematic sectional view taken substantially along the line I3--l3 of Fig. 11;

Fig. 14 is a fragmentary front elevational view of one of the scraping units;

Fig. 15 is a vertical sectional view of the scraping unit shown in Fig. 14, this view being taken along the line I 5-I 5 of this figure; and

Fig. 16 is a fragmentary horizontal sectional view taken substantially along the line IBI6 of Fig. 14.

Referring now to the drawings, attention is first directed to Figs. 1, 6 and 7. A supporting base or table I!) has a motor ll mounted thereon; this motor constituting the power means for the apparatus, and through a pulley connection I2, a shaft M of a speed reducing unit 15 is driven. The shaft l4 extends through the unit and has an elliptical cam 16 mounted on the forward end thereof. As hereinafter described, the cam It will cause vibration or lateral reciprocation of scraping elements I! of scraping units indicated generally at IB and 19. An output shaft 20 of the speed reducing unit I5 is connected, through a couple 2|, to a cam shaft 22. Through the aid of the cam shaft 22, the various units of the apparatus are actuated, including the material feeding unit indicated generally at 2-3, the material gripping and holding unit indicated generally at 24, the shearing unit indicated generally at 25, in addition to certain portions of the scraping units I 8 and l 9.

Vertical brackets or

members

28 and 23 support, in apertures thereof, parallel supporting rods 30, which provide the main support for the various units, the brackets in turn being mounted upon the base Ill at spaced positions as illustrated.

A drum 32 for supporting a supply of material 33 is rotatably supported by a shaft 34, the ends of which are carried by vertical members 36 extending from the base Ill upon which they are mounted. The material 33 passes downwardly about a sheave 3'! and over a sheave 38, from where it travels longitudinally of the apparatus, controlled in its advancement relative to the scraping units 18 and I9 and the units 24 and '25 by the feeding unit 23. The sheave 31 is supported by the end of a lever 39, pivotally supported at 43 and having an arm M for supporting a weight 42, the latter being adjustable on the arm to vary the downward force of the lever on the sheave 3'! and thus on the material 33. A spring 43, having one end fixed as at 44 to the lever 39 and the other end connected, through the aid of a strand 45, to a fixed member 46 as at 41, serves to apply a given lifting force to the lever which is counteracted by the weight 42, depending upon the tension desired to be created in the material 33.

Considering now the feeding unit :23, attention as directed to Figs. 1 and 6 for the general illustratiop, thereof and Figs. 7 to 10 inclusive for more detailed illustration of the feeding unit. The unit 23 includes a support or body member 56 apertured, as at for mounting upon the supporting rods 36 for sliding movement thereon. The supporting member 56 includes an integral upper portion 52 apertured, at 53, to receive an actuating rod 54. Compression springs 55 are disposed concentric with the actuating rod 54 between collars 56 and their respective sides of the projection 52, providing a cushioned connection between the actuating rod and the support. The collars '56 may be secured to the actuating rod 54 at any desired position thereon depending upon the length of material desired for each filament. Also, collars 58 and 59 (Figs. 6 and 8) are mounted upon the upper supporting rod 36 at desired spaced positions to serve as stops for the unit 23.

Gripping elements 66 and BI are pivotally supported, at .62, upon the support 56 and are of the respective contours as shown, provided with concaved recesses 63 adjacent their pivots to receive a cylindrical control member 64. Through this structure the actuation of either element will cause like actuation of its companion element. A spring 65 normally urges the elements 66 and 6| into closed positions, adapting them to grip, between their jaws 66, the end of the material. A cam surface 61, disposed at an angle with respect to the longitudinal center line of the elements, extends into a concaved retaining recess 68 to receive an actuating finger 69, which serves to cause actuation of the gripping elements when riding upon the cam surface 61 and into the recess 68. The recess 68 serves to hold the finger 69 against displacement during movement of the unit 23 toward the units 24 and '25. The finger 69 is pivotally supported, as at I6, and has lateral projections ll and '12 positioned to be engaged by'cam actuating rods I3 and 14, respectively. When in the position shown in Figs. 1, 6, 8, 9 and 10, the cam actuating rod I3 is positioned for actuation through a cam lever I6. The cam lever 16 is mounted for rotation upon a shaft 11, the latter being supported in suitable bearings I8 and the vertical member 29. A cam 86', fixedly mounted upon the cam shaft 22 and of the contour shown in Fig. 9, is adapted to actuate the lever I6 through the engagement of a high portion 8| of the cam with a cam roller 82 of the leveri'IG. A spring 83 causes the cam roller 82 to constantly ride upon the cam 86 and to hold the lever. 16 in its inoperative position until actuated by the high portion 8| of the cam. The function of this mechanism under the control of the cam 86 is to a move the rod I3 upwardly to rock the finger 69 about its pivot 16 and ride upon the cam surface 61 ofthe element 66 until its engaging end is disposed in the recess 68, to thus open the elements 66 and 6| and hold them in the open position for a given length of time.

The rods I3 and I4 are supported for vertical movement in apertured portions 85 integral with the support 56. Pins 86, carried by each of the rods I3 and I4, normally rest upon their lower portions 85 to locate the lower ends of the rods I3 and I4 short distances above the normal positions of the engaging ends of their respective cam levers. The detailed structures of the cam 86 and its lever I6 for the rod I3 are shown particularly in Fig. 9. Another cam 96, identical with the cam 86, is mounted upon the cam shaft 22, as illustrated in Fig. l, and adapted to actuate a cam lever 9i, which is substantially identical in structure to the cam lever I6, rotatably mounted upon the shaft 11 and provided with a spring similar to the spring 63 to cause the lever 9| to be normally held in its inoperative position against its cam 96 until time for its actuation by a high point of the cam 96 similar to the high point 8| of the cam 86. The levers l6 and 9|, as illustrated in Fig. 1, are disposed at spaced positions. When the unit 23 is moved to its extreme position, to the right (Figs. 1 and 6), the gripping elements 66 and 6|, which are in open position during this movement, have their jaws 66 disposed above and below the forward end of the material 33 which is held by the unit 24. After the unit 23 reaches this position, the rod I4 is disposed above the lever 9! and is actuated or moved upwardly through the actuation of the lever 9i by its cam 96, to trip the finger 69, moving it out of its recess 68 and into the position shown in Fig. 8. The spring 65 thus causes closing of the gripping elements 66 and 6|, causing them to grip the ends of the material.

The mechanism for actuating the feeding unit 23 through the aid of the actuating rod 54 is shown at the left of both Figs. 1 and 6. The cam shaft 22, which is driven by the motor I I, is journalled in suitable bearings in the vertical member '28 and in a bearing bracket which is mounted upon the table or base I6. A bevelled gear96 is mounted upon the adjacent end of the cam shaft 22 and interengagesa similar bevelled gear 91, the latter being mounted upon a vertical shaft 98 which is journalled in a bearing 99 supported by the table I6. The shaft 98 also has a wheel I66 mounted thereon above the gear 91, the Wheel having an eccentric spindle I6I carried therebyand projecting into a connecting block I62. The block [62 is positioned to ride in an elongate aperture I63 of a lever I64, the latter having one end pivotally supported at I65 while the other end is connected through a link I66 to the actuating rod 54. Therefore, through the constant rotation of the wheel I66, the lever I64, through the eccentric connection with the wheel, is oscillated about its pivot I65 to cause reciprocation of the actuating rod 54 to move the unit 23 to intermittently advance given lengths of the material 33. It will be noted that the actuating rod 54 is supported in a bearing I61 carried by the vertical member 29 and in a bearing portion 168 of a supporting bracket I69, which supports the

units

24 and 25.

Attention is now directed to the unit 24, which is shown in detail in Figs. 11 and 12. This unit constitutes the material h'olding means and is similar in structure to the unit 23 in that it is provided with material gripping elements I I2 and I I4 pivotally supported-at H5 and having a connecting member-H6- cylindrical in contour and receivable in concave recesses I H of the elements H2 and H4, to cause simultaneous and like actuation of both elements when one of the elements is actuated. The forward ends of the elements 2 and H4 are provided with gripping jaws IIB between which the material 33 is advanced, through the aid of the unit 23, when the elements are in open position, and, through the aid of which the material'may be held against displacement, during the scraping operations. The elements 2 and H4 are normally held in closed positions through the aid of a spring I26 positioned between the legs of the elements, as illustrated in Fig. 12. The pivots H5 are threadedly disposed in the supporting bracket I69 so that the gripping jaws are positioned adjacent the path of advancement of the material.

An actuable plunger I2 I, supported in a sleeve I22, carried by a lateral projection I23 of the supporting bracket I09, has its lower end positioned to be engaged by a cam lever I24 which is mounted for rotation upon the shaft 11 and provided with a cam roller I25 held in engagement with the periphery of a cam I26 through the aid of a spring I21. As illustrated in Fig. 12, the gripping elements H2 and H4 are in their closed positions, and during this interval a low portion I28 of the cam I26 rides upon the roller I25, a high portion I29 of the cam causing actuation of the lever I24 to move the plunger I2I upwardly to cause movement of the elements H2 and H4 into open positions against the force of the spring I20.

The unit 25, namely the shearing unit, is also mounted upon the supporting bracket I09. This unit includes companion shearing elements I32 and I33, which are mounted upon a common pivot I34 carried by the bracket I09. Through the aid of a spring I35 (Fig. 11) engaging the shearing element I33, a given force is applied to hold the elements in close engagement with each other, to perform a satisfactory shearing operation upon the material 33, the shearing element I32 being backed up by the bracket I09. The bracket I09 is, as illustrated, supported by the supporting rods 30, locating the

units

24 and 25 in their preferred positions adjacent the path of the material 33. The elements I32 and I33 have shearing edges I36 and I31, respectively, which, when moved relative to each other into the closed position shown in Figs. 11 and 13, will shear the material. Through the aid of links I39 and I40, the elements I32 and I 33 are connected operatively to their respective cam levers MI and I42. The cam levers are rotatably mounted upon the shaft 11 and are provide with cam rollers I43 and I44 respectively, which are held in engagement with their cams I45 and I46 through the aid of springs I41 and I48. The cams I45 and I46 are mounted upon the cam shaft 22, for rotation therewith, and differ in contour to cause reverse movements of the cutting elements I32 and I33. The cam I 45 has a high portion I50 throughout its periphery excepting between positions II and I52, where a low portion I53 is provided to allow the spring I41 to cause movement of its element I32 into closed position as shown in Fig. 13. The cam I46 has a low portion I55 for the major portion of its periphery excepting between positions I56 and I51, where a high portion I58 causes actuation of its lever I42 to move the element I33 into closed or cutting position. Therefore, for the major portion of the operating cycle the cutting elements I32 and I33 are held in their open positions, as illustrated in Fig. 7, so that the forward ends or gripping jaws 66 of the elements 60 and BI of the feeding unit 23 may pass therebetween to grip the leading end of the material 33 held by the elements I I2 and I I4 of the unit 24.

Attention is now directed to the scraping units I8 and I9, which are identical in structure, a description of one being applicable to both units. The unit I8 has been selected and is shown in detail in Figs. 14, 15 and 16. This unit includes a supporting bracket I60 mounted upon the supporting rods 30 at a selected position with respect to the vertical member 28 and the supporting bracket of the companion unit I9. A rectangular aperture I6I is formed in the supporting bracket I60, to receive a reciprocable element I62 formed for reciprocation between given limits in the aperture. The element I62 has spaced portions as illustrated in Fig. 6, to receive a mounting clamp I63 therebetween, the latter being fixedly mounted upon an actuating rod I64 to thus connect the element thereto. The actuating rod I64 has a similar connection with the unit I9 and serves to cause simultaneous actuation of the scraping elements I1 ofboth units. This actuation of the rod I 64 is brought about through the rotation of the cam I6 engaging a cam roller I66 which is constantly urged to ride upon the cam through the aid of a spring I61. The actuating rod I64 is supported for its reciprocable movement in an aperture I68 in the vertical member 28.

Returning now to the element I62, it will be noted that a forwardly projecting portion I10 thereof is provided with a vertical threaded aperture I1I to receive a threaded sleeve I12 held in a desired adjusted position therein relative to the path of the material 33 through the aid of a nut I13. The scraping element I1, having a tapered lower end I15 extending to an edge sumciently sharp for the removal of the coating or covering material from the core of the main material 33, is movably disposed in the sleeve I12 limited in its movement by a notch I16 cooperating with a pin I11 carried by the sleeve I 12. A spring I18 engages the scraping element I1 in the sleeve I12 to apply a desired holding force upon the element, which force may be varied through the aid of an adjusting screw I19, the adjustment of which may be held through the aid of a nut I80. Through the aid of this mechanism, the scraping element I1 is constantly reciprocated between given limits under the control of the cam I6 and the actuating rod I64. The path of advancement of the material 33 is beneath the scraping element I1, as illustrated in Fig. 15. During its advancement, the material 33 rides upon spaced portions I82 of a table I 83, the central portion of which is recessed, as at I84. The table I83 has tubular portions I85 integral therewith and projecting downwardly over vertical guides I86 supported by lateral projections I81 of the supporting bracket I 60. Integral arms I90 of the supporting bracket I60 are of the contours illustrated in Fig. 15, extending rearwardly in parallel spaced positions to'support the ends of a shaft I9I and formed to straddle the cam shaft 22 as at I92. A cam I93, keyed to the cam shaft 22 and of the contour shown in Fig. 15, is adapted to actuate a cam lever I94 supported by the shaft I9I through the aid of a cam roller I95 rotatably carried by the lever. The cam lever I94 is normally urged counterclockwise through the aid of a spring I96. to maintain the roller I95 upon the periphery of the cam. Through the aid of a link I98, the cam lever I94 is operatively connected to the table I83 to cause vertical movement of the table relative to the scraping element I1 to move the material into engagement with the scraping element. Means is provided to cooperate with the table I83, particularly the supporting portions I 82 thereof, to grip the material upon,

the opposite sides of the scraping element I1 and to hold the material again-st displacement during the scraping operation. This means includes "a pad 200 supported by screws 20I movably disposed in lateral projections 202 of the supporting bracket I60 and normally urged downwardly, through the aid of springs 203 interposed between the pad 200 and the projections 202, as illustrated in Fig. 14, and limited in the downward movement by the heads of the screws 2III.

As heretofore stated, the unit I 9 is identical in every detail with the unit I8 and is operated simultaneously herewith to move the adjacent portion of the material into engagement with its vibrating or reciprocating element IT for the scraping of the covering from the material. These units are positioned with respect to each other and the shearing element 25, depending upon the length of the filament or article desired to be scraped from the material. The shearing operation is performed, in the present instance, at the center line of the scraped portion of the material. Therefore, the accurate adjustment of the units is important. The unit I8 and I9 are so complete in themselves that the adjustment requires only their movement on the supporting rods, the integral arms I90 thereof causing simultaneous adjustment of the cams I93 on the cam shaft 22 through their key connections.

A platform or receivin tray 295 extends between units 23 and 25 a short distance therebeneath, when the former is in the left hand position as shown in Figs. 1 and 6, to receive the severed articles of filaments. The tray is provided with supporting legs 206 through the aid of which tray may be supported and mounted upon the table I0,

Considering now the operation of the apparatus, let it be assumed that the various units are in their desired positions and that the material 33 is of the ribbon type illustrated in Figs. 2 and 5. Let it also be assumed that the material. is threaded through the apparatus as illustrated in Figs. 1, 5 and 6. During the threading of the material, it is given a twist so that one half turn will exist in the material between the scraping units I8 and I9 as illustrated in Fig. 5. During the operation of the unit I8, the portion of the material adjacent the recess I84 of the table I83 will be moved into engagement with the scraping element I! of this unit, resulting in the scraping of the cover from the adjacent side of the material. The material is held firmly against displacement between the portions I82 of the table and the pad 200 through the force of the springs 203, leaving the portion of the material being scraped unsupported.

The function of the unit I9 will not be discussed at this time. Instead, attention is directed to the advancement of the material as the unit I9 and I9 open, moving their tables I83 downwardly to thus move the material away from the scraping element II, the unit 23 first approaching the leading end of the material disposed adjacent the unit 25, the material adjacent this portion being held by the unit'24. As soon as the unit 23 reaches its extreme-position at the right, the finger 69 will be .tripped, that is, moved free of its retaining recess 68, allowing the spring 65 to close the elements 60 and 6| to grip the leading end of the material. As soon as this has been accomplished, the gripping elements II2 and I I4 of th unit 24 are opened through the actuation of the cam I25, freeing the material for advancing a given distance. This advancement is brought about through the movement of the unit 23 to its extreme position at the left, through the actuation of the rod 54 and the eccentric driving means therefor illustrated in Figs. 1 and 6. During this advancement of the material, the portion thereof which was scraped by the'element I! of the unit I 8 is presented to the unit I9, the scraped portion, however, being disposed at the opposite or under side of the material away from the scraping element II of the unit I9. Therefore, during the next scraping operation when both units I8 and I9 function, the unit I8 will scrape anew portion of the material, while the unit I9, that is, its element II, will scrape the opposite side of the portion previously scraped by the unit I8.

During the next advancing cycle of the material, which is brought about while the shearing unit 25 is open, the portion present at the unit I 9 will be disposed at the shearing unit 25. Thus after the unit 23 has completed the advancement of the material and the holding members of the unit 24 have closed upon the material, the shearing elements I32 and I33 will be moved into closed positions simultaneously through the actuation of their respective levers functioning through their cams to shear the material at the center line of the scraped portion. The sheared portion of the material will drop upon the tray or table 205, where it may be removed at will, it being released by the opening of the unit23.

As previously stated, the materials from which the filaments may be formed, throughthe aid of this apparatus, may Vary in size from that of the strand type illustrated in Figs. 3 and:4 to those having greater widths such as the ribbon type illustrated in Figs. 2 and 5. When the apparatus is employed to scrape material of the strand type, it is not necessary to thread this type of material through the apparatus with an existing twist present therein between the units I8 and I9. By supporting the material only at the opposite sides of the portion being scraped and leaving that portion unsupported, the action of the scraping element II will actually scrape the covering from one side of the material and break the covering free of the other parts of that scraped portion due to the reciproeabl action of the resiliently supported element I'I' of each unit and the bending or flexing action of that portion of the material. In this instance the same operation is repeated at the unit I9 that was performed at the unit I8, to assurecomplete removal of all portions of the covering at the desired length of material being scraped;

In reviewing the function ofthe-apparatus, it will be observed that units I8, I9, 25 and 23 are open and the unit 24 is closed when the unit 23 is ready to grip the leading end of the material. The unit 25 remains closed until after the unit 23 is closed, to grip the end of the material, after which the unit 24 is open, allowing advancement of the material the given distance equalling the distance between the scraping element F! of the units I8 and I9. After the material has been advanced and before the unit 23 returns to advance the material another given length, the first length of the material is severed by the closing of the unit 25, during which time units I8 and I9 are closed to bring about the scraping operations thereof, the material being held under tension between the unit 24 and the supply drum 32, this tension being created through the lever 39 under the control of the weight 42 and the spring 43.

Although specific improvements of the invention have been shown and described, it will be understood that they are but illustrative and that various modifications may be made therein without departing from the scope and spirit of this invention as defined by the appended claims.

What is claimed is:

1. An apparatus for scraping portions of a cover from a covered core, the apparatus comprising a scraping element having a, scraping edge, means to continuously reciprocate the element between given limits, means to grip a covered core at spaced positions beyond the said limits of the element, leaving the intermediate portion thereof unsupported, and means to move the gripping means to move the unsupported portion of the core into engagement with the scraping edge of the element for scraping a portion of the cover from the said unsupported portion of the material.

2. An apparatus for scraping portions of a cover from a covered core, the apparatu comprising a scraping element having a scraping edge, means to continuously reciprocate the element between given limits, companion gripping members formed to grip a. covered core adjacent the said limits and leave the intermediate portion thereof unsupported, and means to cause movement of one of the gripping members toward the other gripping member to cause them to grip the covered core and to subsequently move the gripping members with the covered core to move the unsupported portion thereof laterally into engagement with the scraping edge of the element.

3. An apparatus for scraping portions of a cover from a covered fiat-sided core, the apparatus comprising a scraping element having a scraping edge, means to continuously reciprocate the element between given limits, companion gripping members formed to grip a covered core adjacent the said limits and leave the intermediate portion thereof unsupported, and means to cause movement of one of the gripping members toward the other gripping member to cause them to grip the covered core and to subsequently move the gripping members with the covered core to move the unsupported portion thereof sidewise laterally into engagement with the scraping edge of the element to cause removal of all parts of the cover of the portion within the said limits of the element.

4. An apparatus for scraping portions of a cover from a covered core, the apparatus comprising means to advance a covered core intermittently in a given path, like scraping elements disposed at spaced positions on the same side of the said path, and means to cause presentation of opposing sides of the covered core to the respective scraping elements to cause removal of portions of the cover from opposite sides of the core.

5. An apparatus for scraping portions of a cover from a covered core, the apparatus comprising a feeding unit movable between a gripping position and a releasing position including companion gripping elements one of which has a cam surface, separate means to pivotally support the elements, means operatively connecting the elements for movement of one of the elements into open or closed positions upon movement of the other element into its open or closed positions, means to normally urge the elements into their closed positions, a finger pivotally supported by the unit and movable in engagement with the said cam surface to move the element thereof into open position, cause the connecting means to move the other element into open position and hold the elements in the open positions during their travel to the gripping position to grip the leading end of the core, means actuable adjacent the gripping position to release the finger to render the closing means effective to cause the elements to grip the leading end of the core, means to move the unit to intermittently advance the core, and means to scrape a portion of the cover from the core.

6. An apparatus for scraping portions of a cover from a covered core, the apparatus comprising a feeding unit movable between a gripping position and a releasing position including companion gripping elements one of which has a cam surface, separate means to pivotally support the elements, means operatively connecting the elements for movement of one of the elements into open or closed positions upon movement of the other element into its open or closed positions, means to normally urge the elements into their closed positions, a finger pivotally supported by the unit and movable in engagement with the said cam surface to move the element thereof into open position, cause the connecting means to move the other element into open position and hold the elements in the open positions during their travel to the gripping position to grip the leading end of the core, means actuable adjacent the gripping position to release the finger to render the closing means effective to cause the elements to grip the leading end of the core, means to move the unit to intermittently advance the core, means to scrape a portion of the cover from the core, and means actuable adjacent the releasing position to move the finger to move the elements into their closed positions.

7. An apparatus for scraping portions of a cover from a covered core, the apparatus comprising a feeding unit movable between a gripping position and a releasing position including companion gripping elements one of which has a cam surface, separate means to pivotally support the elements, a cylindrical member disposed in recesses of the elements between their pivotal supports to cause movement of one of the elements into open or closed position upon movement of the other element into its open or closed position, means to normally urge the elements into their closed positions, a finger pivotally supported by the unit and movable in engagement with the said cam surface to move the element thereof into open position, cause the connecting means to move the other element into open position and hold the elements in the open positions during their travel to the gripping position to grip the leading end of the core, means actuable adjacent the gripping position to release the finger to render the closing means efiective to cause the elements to grip the leading end of the core, means to move the unit to intermittently advance the core, and means to scrape a portion of the cover from the core.

JOHN EHRET, JR.

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

UNITED STATES PATENTS Number Name Date 2,318,438 Voth May 4, 1943 1,942,069 Setoguchi Jan. 2, 1934 799,321 Gardner Sept. 12, 1905 378,805 Richards Feb. 28, 1888 2,049,914 Lewis Aug. 4, 1936 1,969,517 Malloy Aug. 7, 1934 1,313,462 Brown Aug. 19, 1919 1,936,559 Williams Nov. 21, 1933 1,930,219 Zimber Oct. 10, 1933 2,356,837 Ehret, Jr., et a1 Aug. 29, 1944 1,800,950 Metzger Apr. 14, 1931 1,987,959 Knuuti Jan, 15, 1935 2,356,837 Ehret Aug. 29, 19.44