US1940464A - Apparatus for slitting leather - Google Patents

Description

1933- J. R. RITZINGER Er-AL 1,940,464

APPARATUS FOR SLITTING LEATHER Filed Aug. 24, 1931 s Sheets-Sheet 1 "imam i 21 Y l 1, W 15 T22 19 J8\ llmmlh.

Z VI EI .[LIZZTE 1933- J. R. RITZINGER ET AL 1,940,454

APPARATUS FOR SLITTING LEATHER Filed Aug. 24, 1931 3 Sheets-Sheet 2 Hill Y I EFVL/TEE J/ad 6. 6Vd726.

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Dec- 19, 933- J. R. RITZINGER El'AL 1,940,464

APPARATUS FOR SLITTING LEATHER Filed Aug. 24, 1931 s Sheets-Sheet 3 9 56 37 y ZZ Z E li/A9 1 A Z6 5 H 44 M 60 Z Z60 Z6 Patented Dec. 19, I933 This invention relates to an forming book covers.

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- Pi l 1,940,464 g APPARATUS FOR SLITTING LEATHER John RvRitzinger and Fred G. Bevans, Kansas City, Mo., assignors to Wilson-Jones Company, i

Chicago, Ill., a corporation of Massachusetts Application August 24, 1931. Serial No. 558,930

12 Claims.

apparatus for mechanism thereto.

This invention has for its object a new and improved apparatus for slitting the leather to receive the back plate and for scoring thesame to provide a hinge joint. The apparatus is exceedingly simple and results .in a great saving of time, labor and expensive machinery.

tures in the different.

Figure l is a top plan view involving this invention. g

side elevational view 0f the ap- Figure 2 is a paratus.

views:

of the apparatus a Figure 3 is a sectional view taken upon the line III- III of'Figure 1, looking in the direction of the arrows and showing the ram in elevation.

Figure 4 is an enlarged sectional view taken upon the line IVIV omitted.

Figure 5 is upon the line V-V platform elevated.

Figure 6 the ram.

of Figure l with parts an enlarged sectional view taken of Figure 1, showing the is an enlarged bottom plan view of Figure 7 is an enlarged fragmentary sectional Figure 6.

Figure 8 is an enlarged sectional upon the line VIII-VIII of Figure 4.

view of. the ram taken upon the line VIE-VII of view. taken Figures 9 and 10v are fragmentary elevational views tion.

of slitting members involving this inven l o o the same is started forward onits working stroke According to this invention, a piece of leather cent horizontal slits are simultaneously formed lengthwise of the sheet to provide a pair of flaps underneath of which tened. .s

a metal plate. may be fas- The: illustrated apparatus-consists of a longi tudinally extending base member 1, A pair of filler blocks 2 (Figure 3) extend transversely of the base 1 adjacent the ends thereof to provide a space Stherebetween for a later appear. A ram guide member 5 is supported upon the filler blocks 2, This guide mem ber consists of spaced. side' walls 6 which are provided with longitudinally extending guide grooves 7 (Figure 5) for receiving ribs Supon' the sides-of a reciprocable ram 9 which fits in the guide'wayformed bythespaced walls 6. The bottomof the ram guide is cut out in alignment with the space 3; between the filler blocks 2. as shown in Figure 3 and a yieldable bottom or sup- 7 port 10 is positioned in such cutout bottom and supported in alignment with the bottomby means of coil'springs ll-positioned in sockets 12 in the base member 1. The yieldable support 10 forms the main supportfor the leatherto be slit. This yielding support has bifurcated ends which re-- 'ceive the filler blocks 2. The forks 10 extend beyond the openspace 3as-shown in Figure 2' fora purpose that will later appear.

It will be noted that the springs 11 normally so tend to force the support 10 upwardly and when it is desired to place a piece of leather uponithe support l0,'it is necessary to depress the same as shown in Figure 2. This supporting platform 10 is adapted to be automatically depresseddur ing the reciprocating movement of the ram -9.. To this end, a pair of pawls or dogs 13 are piv ,oted intermediate their ends to, each side of the guide member 5 and each pair of dogs are pivotally connected in tandemby a rod 15. These dogs are located over the forks 10 of the support ing platformlO,

The aforementionedram 9 carries a cross head 16 shown in Figures 1, 2, and 3 but omitted in Figure 4. A'dog 17 is pivoted intermediate its ends to each end of the cross head. 16 in the plane of the adjacent dog 13. The dogs 1'7 have lower hooked ends (Figure Zladapted for engage ing the forward dogs 13 and swinging the same 7 for releasing the spring?pressedplatform 10 when which will have beenmoved to verticalposition forlowering the work platform 10 as will. later purpose that will 60 i mounted upon the support 19 and provided with a set screw 22 for securing the same in any adjusted position. It will be understood that one lateral edges of the cover.

lateral edge of the leather cover 23 is adapted.

to contact the upstanding flange of the angle bar 20, as shown in Figure 5. Consequently, the

sliding adjustments of the angle bar 20 will determine the distance of the slitportion from the If desirable, an auxiliary platform 10 (Figure 5) upon the near side of the platform may be used'to support the leather cover as it is being slit. i

The bottom of the ram 9 carries slitting mechanism for making a vertical slit in the leather and two adjacent horizontal slits to provide flaps. While this mechanism may assume various forms, the preferred form has beenillustrated'and will now be specifically described. Upon the front end of the ram 9, there is a block 23, upon which a a plate 24 is supported, that projects rearwardly of the block (Figure 4). The shank 25 of the slitting element 26 extends through this plate and is vertically adjustable with respect thereto by means of the nuts 2'? and 28 which are threaded upon said shank upon opposite sides of the plate 24. The shank 25 extends through an aperture in a bearing 29 in the ram 9.

The slitting element '26 which is secured upon the shank '25 consists of a forward point or apex 26 and sloping sides 26 shown more clearly in Figure 6. The slitting element may have a flat bottom as illustrated in Figures 7 and 10, or the bottom may be slightly concave as illustrated in connection with the slitting element 26 shown in Figure 9 wherein the bottom 26 is shown concave. Likewise, the angularity of the portions of the slitting elements may be varied to produce a flat or tapering flap. Adjacent'the forward point of the slitting element, there is a shoe 30having a ii-shaped beveled notch 31 partly overlapped by the edges of the slitting element 26. The shoe 3() is attached to the yielding base 32 by means of a screw bolt 33 and slot 34 whereby the. shoe may be longitudinallyadjusted. The slit flaps pass between the shoe 30 and the slitting element and as it may be desired to vary the thickness of the flaps, the shoe is made longitudinally adjustable. The shoe also serves to smooth the leather'in advance of the slitting element and to guide the flaps upwardly and outwardly. It will be noted that the ram is reduced in thickness rearward of the slitting tool, so a suff cient space occurs between the bottom of the shoeagainst which the leather is pressed and such reduced portion to allow the slit flaps to flex upwardly and outwardly. The slitting element is also adapted to be vertically adjusted with respect to the shoe to determine the depth of cut: The yielding base32 is attached to the bottom of the ramby a pair of screw bolts 35 and- 36 for vertical movement to wardand from the bottom of the ram. A spring confining chamber. 37 surrounds the outer portion of thebolt 35 and a coil-spring 38 in said chamber bears against the shoe 30, whereby such ment 41, which is designed to travel in advance of the slitting element 26 and make a vertical cut in the leather in alignment with the apex 26 of the slitting element. This shoe 39 bridges the gap between the shoe 30 and the rotary slitting elernent 41. It will, of course, be understood that the rotary cutter 41 cuts only partially through the leather and substantially to the same depthas the slitting element. The ram 9 is provided with a pair of yielding tongues 42 with aspace between said tongues to receive the rotary cutting element 41. Suitable recesses 43 are provided in the ram adjacent the outer sides of the tongues 42 for the reception of suitable scorbook covers to provide a more flexible hinge joint for the side portions thereof. The scoring rolls 44 and the rotary cutting element 41 are secured upon a shaft 45'journa1led in the resilient tongues 42. One or more adjustable screws 46 (Figure l) mayextend through the ram 9 and engage the tongues 42 for adjusting the same to lower or raise the rotary cutting element 41 and scoring rolls 44 with respect to the bottom of the ram'in order that the depth of out may be varied.

The ram 9 is adapted to be reciprocated when in use. This maybe manually done or maybe performed by some suitable power means and for this purpose, a T-slot 47 (Figure 1) is'provided in the outer end of the ram for receiving a pneumatically operated plunger W in order to limit the forward movement or the ram, a yoke 48 may be attached to the aforementioned block 23;

This yoke is shown as having terminal depending arms 48 which strike the lugs 13 of the rear dogs 13 when the slitting element reaches the end of the leather cover for arresting'further movement of the ram. The levers 13 will of course be inclined rearwardly and the lower portions will be extending forwardly when the leather plat-, form is elevated. The lower portions of the rear levers 13 have laterally projectinglugs 13 that lie in the path-of the arms 48. When these arms 48 strike the lugs 13 the levers 13 will swing to vertical position and lower the leather platform for removal of the leather and the insertion of a new piece.

In the position of parts as shown in Figure 2, the ram is in its starting position and the leather supporting platform 10 is in its lowered positionso that a leather cover or the like may be inserted in the machine upon the platform 10. The ram 9 may then be advanced for trippingthe dogs 13 and allowing the platform 10 to rise and bring the leather in the proper plane for the slitting-element to cut in the edge thereof. As the ram is further advanced, the rotary cutter 41 will make a slight vertical cut in the leather in alignment with the apex of the slitting element and the scoring rolls will score the hinges. The slitting element will make horizontal slits, extending from the vertical cuts to form suitable flaps which will flex upwardly over the sides of the slitting element as it advances; When the cover has been slit from end to end, the ram will be arrested as previously explained,- and the plat form 10 will be lowered by the righting of'the apparatus is very efficient in that very few, if

any covers are spoiled or result in waste.

We are aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and we, therefore, do not purpose limiting the patent granted hereon otherwise than is necessitated by the prior art.

We claim as our invention:

1. In a leather slitting machine, a supporting platform for maintaining the leather flatwise, a reciprocable member having a rotary cutter for making a vertical incision, slitting elements for making lateral incisions from said vertical incision, and scoring rolls for scoring the leather and means for guiding said member.

2. In a leather slitting machine, a member having a guideway with an open bottom, a platform yieldably supported below said member, a ram embodying cutting elements in said guideway, and means actuated by movement of said ram for depressing said platform.

3. In a leather slitting machine, a supporting platform, a member forming a guideway along one surface of said platform, and a reciprocable ram mounted in said guideway, leather cutting elements for making a vertical incision and adjacent lateral incisions carried by said ram and scoring rolls for forming hinge joints mounted upon said ram.

4. In a leather slitting apparatus, a cutting element for making a vertical incision in the leather,

slitting elements for making lateral incisions from said vertical incisions'for forming flaps, scoring elements for forming hinge jointsin the leather and means for simultaneously actuating I said elements.

5. In an apparatus for slitting flaps from leather, means forming a guideway, a reciprocating ram mounted in said guideway, a V-shaped cutting tool having a shank extending said ram, a leather supporting platform beneath said ram, a yieldingbase attached to the bottom of the ram forward of said tool, a shoe attached to' said yielding base, and yielding means for urging said platform toward said shoe.

6. In an apparatus for slitting flaps from leather, means forming a guideway, a ram mounted in said guideway, a yielding base upon the bottom of said ram, a shoe having a V-shaped notch secured to said base, a V-shaped cutting tool mounted upon said ram, and cooperating with I movement in a straight gaging said platform, and

through said shoe, and a leather supporting platform beneath said ram. I c

7. In an apparatus for slitting flaps from leather, a leather supporting platform, means for guiding a ram for reciprocable movements above said platform, a rotarycutting element upon said ram, a V-shaped cutting tool upon said ram rearward of said cutting element, a shoe upon the.

bottom of the ram forward of said cutting tool and means for yieldingly urging said platform toward said shoe.

8. In an apparatus for slitting flaps from leather, a leather supporting platform, means forming a guideway above saidplatform, aretary cutting element mounted upon said member for making a vertical incision in said leather and a slitting element upon said ram rearward of said rotary cutting element for making lateral incisions from said vertical incision for producing flaps, and means for guiding said member for path, said member having provisions to allow said to the plane of said leather.

10. In a leather slitting machine, means forming a guideway, a reciprocable ram mounted in said guideway, slitting elements carried by said ram, a'leather supporting platform beneath said flaps to flex with respect ram, yielding means for normally urging saidplatform toward said ram, levers connected in tandem pivoted to said firstmentioriedmeans for enmeans carried by said ram for actuating said levers. I

.11. In an apparatus for cutting flaps from leather, a pairof spaced walls having opposed grooves, a reciprocating member: between said walls having-lateral extending guide parts located in said grooves, a leather cutting element upon said member, a flap slitting element behind and in spaced relation to said cutting element, and a leather supporting platform beneath said walls. 12.'In an apparatus for cutting flaps from leather, a pair of spaced guide members, a ram having guide parts cooperating with said members for movement in a rectilinear path, a cutting tool on the bottom of the ram for making a vertical incision in the leather, a V-shaped cutting tool on said ram rearward of said first tool for severing flaps from the leather, and a leather supporting platform beneath said ram.

JOHN R RITZINGER.

FRED G. BEVANVS.

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