US2080831A - Snipping machine - Google Patents

Description

F` W. OEHRLE SNIPPING MACHINE May 18, 1 937..

Fil'ed Dec. A4, 1935 3 sheets-sheet 1 .May 18, 1937, F. w. QEHRLE I SNIPPING MACHINE Filed Dec. 4, 1935 3 Sheets-Sheet 2 ATToRNEx/.-

May 18, 1937.

F. w. AOEHRLE SNIPPING MACHINE 5 Sheets-Sheet 5 Filed Dec. 1935 INVENToR. fzztazzffz.;

ATToRN Patented May 18, 1937 UNITED' STATES PATENT' OFFICE 19 Claims.

The invention relates to snipping machinesA for use in the manufacture of tapes` or webs of the ladder type, such as are used for supporting the slats of Venetian blinds, and involves certain improvements in elements and in combinations and arrangements thereof for severing interconnecting warp threads or the like between the two body webs in the course of manufacture of tapes of this type.

In the manufacturerof webs of the ladder type, it is the usual practice to weave thetwo body tapes and the straps or connecting tapes simultaneously, the connecting tapes being arranged in two parallel rows along the opposite edges of the body tapes. When woven in this manner the two body tapes cannot be separated to form the ladder structure by reason of the cross-over warp e threads-at the points where the weave for the connecting tapes is transferred from one of the body` tapes to the other. In order. to permit the separation of the two body tapes, it is the usual practice to sever the cross-over threads of the weave manually by the use of shears. 'I'his is a tedious step in the manufacture of such tapes, requiring a number of operators to perform the snipping or severing operation upon the output of a loom.

The primary object of the invention, therefore, is the provision of a machine incorporating a combination and arrangement of elements and suitable actuating mechanism for severingI the cross-over threads between two superposed strips or tapes of woven fabric.

Another object of the invention is the provision of an improved cutting device for severing such cross-over threads, and more particularly for severing such interconnecting portions when arranged in staggered relation and at intervals lengthwise of the strips.

A further object of the invention is the provision of a suitable stop mechanism for arresting the feed of the superposed interconnected tapes in. order that the .cross-over threads or other interconnecting portions may be in proper cooperative position with respect to the'cutting device. Still further objects and advantages of the invention will be apparent from the following description, taken with the accompanying drawings, wherein:

Fig. 1 is a plan view of a machine in which the improvements are incorporated;

Fig. 2 is a longitudinal sectional view of the machine taken on the line 2 2 of Fig. l;

Fig.' 3 is a perspective view of a portion of the machine,`showing the feed rolls, the stop mechamsm and the cutting device;

Fig. 4 is a plan view of a part of the machine, showing the cutting device in the position which 1t occupies immediately prior to its inward movement to sever the threads of one of the interconnecting portions along the adjacent edge of the web, with one of the stop fingers in position for arresting the feed of the web;

Fig. 5 is an elevational view taken along the lower edge of Fig-4, with parts thereof shown in section;

Fig. 6 is a plan view similar to Fig. 4, but showing the cutting device in the position which it occupies immediately prior to its inward movement to seventhe threadsv of one of theinterconnecting portions along the far edge of the web, with the other stop nger in position for arresting the feed of the web;

Fig. 7 is a perspective view of a section of ladder web as it cornes from the loom, with the cross-'over warp threads unsevered; and

Fig. 8 is a perspective view of a section of finished ladder web, with the body tapes separated tapes I3 interwoven therebetween. Such ladder websl are usually made with two spaced rows of connecting tapes i3, one row adjacent each edge of the body tapes. In the process of weaving the ladder web I0, the ends of the straps i3 are 35 interwoven with the body tapes as shown at i4, one end of each strap being interwoven with one of the body tapes and the opposite end of the strap being interwoven'with the other body tape. When so woven the cross-over warp threads I5 must be severed before the two body tapes I I and i2 can be separated to receive the slats of a Venetian blind.I

As illustrated in the various figures of the drawings,l the interwoven portions i4 in each row are equally spaced, and the interwoven portions provided by one row of straps are so arranged longitudinally of the web as to be midway of the interwoven portions alongl the opposite edge of the web. When the web is woven in this manner the interwoven portions i4, although arranged in staggered relation, are equally spaced from each other lengthwise of the web.

The various elements of the mechanism utilized in the invention are supported upon a base member I6 which preferably extends throughout the length of the machine. A table-like support I1 for the web III is mounted on a pair of transversely extended brackets I8 secured toward one end of the base member I6. The web I6 may be fed in any suitable manner between a pair of guides I9 on the outer end of the support I1, and is advanced over the support by means of a pair of feed rolls 20, 2| at the end of the support opposite the guides. The lower feed roll 26 is secured on a shaft 22 mounted in a bearing 23 onthe base member.

Intermittent rotary motion is provided for the shaft 22 by means of a ratchet wheel 24 fixed thereon and actuated vby means of a pawl 25. The pawl 25 is pivoted on a lateral bracket 26 secured to a ratchet arm 21 freely mounted on the shaft 22 adjacent the ratchet wheel 24. A springpressed pawl 28 pivotally secured on the bracket arm 29 engages with the toothed wheel 24 to prevent reverse rotation thereof.

'I'he upper feed roll 2| is secured on a shaft 3|Iv mounted in a bearing 3I in the outer end of a swinging arm 32 having its opposite end pivotally secured to the upper end of a bracket 33 on the base member I6. A gear wheel 34 xed on shaft meshes with a similar gear wheel 35 fixed on shaft 22, so that upper feed roll 2| is positively driven at the same speed as lower feed roll 20. As will be apparent from the manner in which the upper feed roll is mounted, it may be swung upwardly, away from the lower feed roll in order that the web may be releasedfor such adjustments of the feed as maybe desired.

Intermittent motion is given to the ratchet arm 21 by means of a connecting rod 36 having one end pivotally secured to the free end of the ratchet arm and its opposite end pivoted to a crank arm 31 fixed on the outer end of a stub shaft 36 mounted in a bearing 39 on one end of the base member I6. The stub shaft 38 has fixed thereon a driving pulley 40 to receive a belt 4| by which power is delivered to the machine from any suitable source.

The cutting mechanism which has been designed for severing the cross-over warp threads I5 of the web comprises a shearing device 42 mounted upon a carriage preferably in the form of a reciprocating member 43 movable to and fro in a direction at right angles to the direction of feed of the web on the support I1. The carriage 43 is slidable in a guideway 44 formed in a bracket 45 mounted beneath the support I 1 and extending transversely thereof.

The shearing device proper comprises a pair of upper and lower shearing blades 46, 41 pivotally mounted on the upper end of a post 48 secured to'and extending upwardly from the carriage 43. Preferably the inner ends of the shearing blades extend slightly over the adjacent edge of the support I1 when the carriage is in'its outermost position, and these ends of the shearing blades are spaced from the upper surface of the support such a distance as to freely clear the lower body tape I2 during the reciprocating movements of the carriage and the shears. In order that the uppertape II may be separated from the lower one, a pair of spaced separating members 49, 50 is secured along theV edge of the support I1 adjacent the cutting device so as to extend inwardly between the edges of the tapes II and I2. These separating members are preferably arranged on opposite sides of the shearing device so that the shearing blades 46 and 41 move therebetween during the shearing operation,

The inneredges of the separating members 49, 66 are preferably curved as shown at 6I and 62 in order that the interwoven connections I4 between wardly from the support and outwardly over the edge thereof, and comprise vertical portions 64 and horizontal overhanging portions 55.

Intermittent reciprocating movement of the carriage 43 is effected by means of an elongated lever 56 pivoted at 61 on a lateral bracket arm f 58 on the base member I6, and having one end pivotally secured at 59 to the under-side of the carriage 43. 'Ihe opposite end of the lever 56 is provided with a cam roller 6I) for cooperation with a cam groove 6I in the surface of a suitable barrel cam 62 fixed on a cam shaft 63 mounted in a bearing 64 on `the base member I6. The cam shaft 63 is driven by means of a toothed gear wheel 65 fixed thereon and meshing with a toothed gear wheel 66 fixed on the stub shaft 36.

In moving the carriage 43 to and fro in the guideway 44 it is essential that such intermittent action be provided as to move the shearing device 42 into a position to sever the cross-over threads I5 between two interwoven portions I4 along the edge of the web adjacent the shearing device, then move it inwardly into a position to sever the crossover threads between the next'succeeding interwoven portions along the opposite edge of the web, whereupon the shearing device must be retracted in order to be in position to again move inwardly to sever the next succeeding crossover threads along the adjacent edge of the web. These movements may be suitably brought about by forming the cam groove 6I with a dwell a to retain the carriage in the position shown in Figs. 1 and 3. Upon further movement of the cam 62 the cam roller 60 enters the inclined portion b of the groove to thereby move the carriage inwardly so that the shearing device 42 is in position to sever a group of cross-over threads I5 along the adjacent edge of the web. The cam roller 60 next enters the dwell portion c of the groove, during which time the web is advanced by the feeding mechanism so as to bring an interconnecting portion along the opposite edge of the web into cooperative relation with the shearing device as shown in Fig. 6. With the web in this position, the cam roller 60 then enters the inclined portion d of the groove to thereupon move the carriage inwardly still further to bring the shearing device into shearing position. 'Ihe cam roller 60 then passes through the dwell portion e of the groove and enters the inclined portion f, ,which retracts the carriage to thereby return the shears to the position shown in Figs. 1 and 3.

The shearing blades 46, 41 are actuated by means of a vertical rock shaft 61 supported in vthe outer end of the carriage 43 and having a cross ann 68 secured on its upper end. One end ofthe cross arm 68 is connected tothe outer end of the shearing blade 46 by means of a short link 69, and the opposite end of the cross arm is connected to the outer end of the other shearing blade 41 by means of a short link 10. With such a connection between the shearing blades it will be apparent that movement of the rock shaft 61 serves to move the operative ends of the shearing blades to and from each other to effect the severing or snipping operation.

-The rock shaft 61 is actuated by means of a lever arm 1I secured to the lower end thereof and having pivotally connected to its free end one end of a vcam rod 12, the opposite end of which is pivoted to the lower end of a cam lever 13 suspended from a supporting'shaft 18 in an overhanging bracket arm 15 mounted on a laterally extending portion 16 of the base member I6. The cam lever -13 carries a cam roller 11 which cooperates with an elongated symmetrical cam groove 18 in the faceof a'cam plate 19 xed on the cam shaft 63. With such a cam groove, it will be apparent that the shearing device 82 will be actuated twice during each rotation of the cam shaft 63, these actuations serving to sever the cross-over threads of an interconnecting portion along one edge of the web, and then sever the cross-over threads ofl the next succeeding interconnected portion along the opposite edge` of the web.

While a feed device such as disclosed herein serves to feed the web intermittently to bring the successive interconnecting portions substantially into cooperative position with respect to the severing device, it is essential, in view of the' 7 nature of the web upon which the device operates.

that positively acting stop means be provided for arresting the feed of the web so that the interconnecting portions will be accurately positioned for cooperation with the severing device. The stop mechanism which has'been devisedA for this purpose comprises a pair of stop ngers 80, 8| alternately actuated to move into and out of position between the tapes II and I2 for engagement with the junction of straps I3 with the interwoven portions I4 along the near. edge of the web I0. Stop finger 80 is secured to the free end. of the long arm 82 of a two-armed lever 83, and finger 8| is preferably secured by adjustable means 84 to the free end of the'arm 85 of a three-armed lever 86. The two-armed lever 83 is pivotally mounted on the upper end of a post 81 projecting upwardly from a bracket 88 secured vto the under-side of the support I1, and the short arm 89 of this lever isconnected by means of a link 90 to the short arm 9| of the three-armed lever 86, which is likewise pivotally supported on the bracket 88.

Pivotally connected tothe free end of the arm 92 of the three-armed lever 86 is a cam rod 93 the opposite end of which -is pivotally connected to the lower end of a cam lever .94 suspended from the shaft 16. The cam lever 94 carries a cam roller 95 which cooperates with a cam surface on the edge of a cam plate 96 fixed to the cam shaft 63. The roller 95 is maintained in contact with cam 96 by means of a coiled spring 91 having one end secured to the cam lever 99 and its opposite end secured to a. bracket arm '98 mounted on the base member I6. The cam plate 96 is of such ashape as to reciprocate the cam rod 93 once during each rotation of cam shaft 63.

It will thus be apparent that, upon each rotation of the cam shaft 63, the`stop` finger 8| will be moved into and out of position between the two body tapes II and I2I on the support I1. It will also be apparent that, by reason of the interconnection between the two-armed lever 83 and the three-armed lever 86, the stop pin 80 will be moved alternately with respect to the stop pin 8| into and out of position between the cent the shearing device are in proper coopera -tive position with respect to the shearing device.

In view of the equal spacing of the staggered interwoven portions lengthwise of the web. it is sudicient to have the stop pins alternately engage with the interconnecting portions along the adjacent'edge of the web, without the necessity of having them engage with the interconnecting portions along the opposite edge of the web.

In order to-turn .the edge of tape II upwardly so .that stop fingers 80 and 8| may readily enter between tapes II and' I2, a tape separating device 99 is secured to bracket I8 near feed roll 20. 'I'he separating device-39 is in the form of a rod inclined' upwardly to the 'upper surface of support I1, whereupon it is bent inwardly over the adjacent edge of tape I2, thence upwardly to provide a vertical portion I for engagement with the edge of tape 'II to turn this edge upwardly in the manner shown by Figs. 3 to 6 of the drawings.

two body lwebs. The arrangement of the stop' pins 88 and 8| is such that each lpin is brought -An elongated retainer IOI is secured to the.

edge of supportA I1 opposite the separating device 99 and the stop fingers 80 and 8l for the purpose of preventing undue movement of web I0 away from the support at this point. the case of retainer members 58, the retainer IOI is'formed with a vertical portion |02 to .prevent displacement of the web beyond the edge of the support, and a horizontal portion |03 to prevent undue upward movement.

The feed of the web I0 over the support I1 may be controlled by means of a weight |04. This weight rests upon the web between guide members I9, and it is held against movement with the web by one of the retaining members 53.

Inasmuch as the operation of the various elements of the machine has been described along with the description of the structure of thesel elements, no detailed description of the operation is believed to be necessary to a complete understanding of the machine. It will be noted, however, that the intermittent feed of the web I0 by the feed rolls 20, 2| is so arranged and timed with respect to the stop mechanism that one or the other of the alternately actuated stop fingers 80,'0I is moved into position between tapes II, I2

As in drawings that, when the advance of the web isl arrested by stop''nger' 00,one of the groups of cross-over threads I5 along the near edge of the web isdirectly in front of the shearing device 42..

At this time the carriage 43 is moved inwardly by the portion b of ca'm groove 6| to position shearing blades 46, 41 on opposite sides of crossover threads I5. Cam 19 then operates to actuate the ,shearing blades through cam rod 12, thus severing the adjacent group of threads I5.

'I'he feed mechanism thereupon operates' to advancethe web to bring the next succeeding group of cross-over threads I5 on the opposite edge of along said support, means for separating said` vice as shown in Fig. 6 of the drawings. In the meantime stop nger 80 haspbeen withdrawn and` stop finger 8l is moved in to position to engage the interconnection theretofore engaged by iinger 80, thereby positively arresting the group of cross-over threads l5 in front of the shearing device. The carriage 43 is thereupon moved inwardly still further by the portion d of cam groove 8l to bring the shearing blades 4B, I1 on opposite sides of this group of cross-over threads. The shearing blades are again actuated by cam 19 to sever the threads of this group, whereupon pory tion ,f of cam groove 6| operates to retract the carriage 43 and return the shearing device to the position shown in Figs. l, 3, and 4 of the drawings.

The feed-mechanism again operates to bring the next group of threads l'along the near edge of the web into position in front of the shearing device, whereupon the cycle of operations Just referred to is repeated.

While specific forms and arrangements of the various parts of the mechanism have been disclosed, it is to be understood that the disclosure is illustrative only and that changes in form and arrangement of the elements may be made within the scope of the invention as described herein and pointed out in the appended claims.

What I desire to claim as my invention is:

1. In apparatus for making a ladder web for Venetian blinds, a support for said web, feeding means for advancing said web oversaid support, a cutting device movably mounted along said support for severing portions of said web arranged at intervals thereon, stop means for arresting the feed of said. web when each of said portions is adjacent to said cutting device, and means for actuating said cutting device to sever said portions in succession.

2. In apparatus for makinga ladder web for Venetian blinds, a support for said web. feeding means for advancing said web over said support, a cutting device mounted along said support for severing portions of said web arranged at intervals thereon, stop means for arresting the feed of said web when each of said portions is adjacent to said cutting device, means for moving said cutting device successively into operative position with respect to each of said portions, and means for actuating said cutting device to sever each of said portions in succession.

3. Inapparatus for making a ladder web for Venetian blinds, a support for said web, feeding means for advancing said web over said support,

, a cutting device mounted along said support for severing portions of said web arranged at intervals thereon, stop means intermittently, movable into and out of engagement with said w'eb for arrestfeeding means for advancing said strips over said support, a cutting. device movably mounted strips to permit said cutting device to move freely therebetween, stop means intermittently movable into and out of position between said strips for arresting the feed thereof when each of said portions is adjacent said cutting device, and means for actuating said cutting device to sever said interconnecting portions in succession.

. 9,080,831. the web into position infront of the shearing de- 5. In apparatus for severing spaced interconnecting portions between two strips of fabric, a

support for said strips in superposed position, feeding means foradvancing said strips over said support, a cutting device movably mounted along said support, means for separating said strips to permit said cutting device to move freely therebetween, stop means intermittently movable into and out of position between said strips for n arresting the feed thereof when each of said porsupport for said strips in superposed position, feeding means for advancing said strips over said support, a cutting device movably mounted along said support, means for separating said strips to -permit said cutting device tomove freely therebetween, stop means mounted along said support for intermittently arresting the feed of said strips, means for separating the edges of said strips to receive said stop means, and means for actuating said cutting device to sever said interconnecting portions in succession.

7. In mechanism for severing longitudinally spaced, laterally staggered interconnecting portions between two superposed strips of material, a support for said strips, feeding means for advancing said strips longitudinally over said support, a cutting device movably mounted along said support, means for arresting the feed of saidY 3 strips when each of said interconnecting portions is opposite said cutting device, means for moving said cutting device into position to sever each of said interconnecting portions in succession, and means for actuating said cutting device to sever said interconnecting portions.

`8. In a cutting machine, a work support, feeding means for intermittently advancing the work along said support, a cutting device mounted for movement transversely of said support, a cam shaft, a cam on said shaft for moving said cutting device step by step transversely of said support andi providing intervening periods of rest, actuating means for said cutting device, a cam on said shaft for operating said actuating means during said periods. of rest, stop mechanism mounted along said support for positively arresting the feed of the werk during said periods of rest, and a cam on said shaft for actuating said stop mechanism in timed relation with the step by step movements of said cutting device.

9. In apparatus for severing spaced intercon-f necting portions between two strips of fabric, a support for said strips in superposed position, feeding means for advancing said strips over said "support, a cutting device movably mounted along said support,l means for separating said strips to permit said cutting device to move freely therebetween, and means for actuating said cutting device to sever said interconnecting portions in succession.

' 10. In cutting mechanism, a work support, feeding means for advancing the work over said supprt in a given direction, a carriage mounted along said support for to and fro movement at right angles to the direction of 4movement of said Work, a cutting device secured on said carriage for movement therewith, intermittently actuated means for moving said carriage, means for internecting portions between two strips of fabric, a

mittently arresting the movement of said carriage in one direction, and means for actuating said cutting device when said carriage is in positions of arrested movement.

11. In cutting mechanism for operating betweentwo superposed strips of material, a support for said strips, feeding means for advancing said strips over said support in a givendirection, a carriage mounted along said support for reciprocatory movement in a direction at right angles to the direction of feed of said strips, a cutting device secured on said carriage for movernent therewith, means for separating the edges of said strips adjacent said cutting device to receive said device, means for retaining the edges of said strips opposite said cutting device on 'said support, means for reciprocating said carriage, and means for actuating said cutting device.

1,2. In a cutting machine,'a work support, feeding means for intermittently advancing the work along said support, a cutting device mounted for movement transversely of said support. a cam shaft, a cam on said shaft for moving said cutting device step by step transversely of said support and providing intervening periods of rest, actuating means for said cutting device, and a cam on said shaft for operating said actuating means during said periods of rest.

13. In work feed arresting mechanism, a support for the work, feeding means for advancing said work over said support, a pair of spaced stop fingers movably mounted along said support, and means for moving each of said fingers alternately into and out of engagement with said work to positively arrest the feed thereof.

14. In work feed arresting mechanism, a support for the work, feeding means for advancing said work over said support, a pair of lever arms Apivotally mounted along said support; a stop nger secured on each lever arm. and means for simultaneously actuating said lever arms to move said stop fingers alternately into and out of work feed arresting position.

15. In work feed arresting mechanism, a support for the work, feeding means for advancing said work over said support, a pair of lever arms pivotally mounted along said support, a stop i'lnger secured on each lever arm, intermittently operating means for actuating one of said lever arms to move the stop finger secured thereon into and out of stopping position, and means interconnecting said lever arms to move the stop nger on the second lever arm into and out of stopping` position alternately with respect to the stop finger `on the first lever arm.

16. In mechanism for intermittently arresting the feed of a pair of superposed strips of material having interconnecting portions spaced lengthwise thereof, a support for said strips, feeding means for advancing said strips over said support. a pair of stop lingers spaced lengthwise along said support for movement into and vout of position between said strips. means for separating the edges of said strips to receive said stop fingers. and intermittently operating means for moving said. stop fingers alternately into and out of position for engagement with the interconnecting portions of said strips.

17. In a cutting machine, a work support, feeding means for intermittently advancing the work across said support, a cutting device mounted along said support for severing a part of the work, a pair of spaced stop fingers movably mounted along said support.l means, for moving each of said fingers alternately into and out of engagement with said work to positively arrest the feed thereof, and means to actuate-said cutting device simultaneously with the movement of each of said stop fingers into stopping position.

18. In a cutting machine, a work support, feeding means for intermittently advancing the work across said support, a cutting device mounted along said support for severing a part of the work, a pair of lever arms pivotally mounted along said support, a stop finger secured on each lever arm, means for simultaneously actuating said lever arms to move said stopilngers alternately into and out of work feedarresting position, and means to actuate said cutting device simultaneously with the movement of each stop finger into work feed arresting position.

19. In a cutting machine. a work support, feeding means for intermittently advancing the work' across said support, a cutting device mounted along said support for severing a part of the work, a pair of lever arms pivotally mounted along'said support, a stop finger securedon each lever arm, intermittently operating means for actuating one of said lever arms to move the stop finger secured thereon into and out of stopping position. means interconnecting said lever arms to move the stop flngeron the'second lever arm into and out of stopping position alternately with respect to the stop finger on .the first lever arm, and means to actuate said cutting device simultaneously with the movement of each stop finger into stopping position.

mANmNw. OEHRLE.

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