Assembling machine

June 25, 1935.

2,006,071

Η. E. EDWARDS

ASSEMBLING MACHINE

Filed July 6, 1931

Sheets-Sheet 1

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June 25, 1935.

2,006,071

Η. E. EDWARDS

ASSEMBLING MACHINE

Filed July 6, 1931 3 Sheets-Sheet 2

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June 25, 1935.

Η. E. EDWARDS

ASSEMBLING MACHINE

Filed July 6, 1931

2,006,071

Sheets-Sheet 3

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Patented June 25, 1935

2,006,071

UNITED STATES PATENT OFFICE

2,006,071 ASSEMBLING MACHINE Herbert E. Edwards, Brookline, Mass. Application July 6, 1931, Serial No. 548,745

Claims.

The present invention relates to assembling machines, and more particularly to machines for assembling component parts of shoe uppers.

In the manufacture of shoes, particularly for 5 women, it is necessary to assemble with shoe upper parts, such as vamps, tips and quarters, relatively small pieces such as overlays and underlays. In addition it is customary to reinforce inherently weak portions of the shoe upper 10 parts or portions thereof which will be weakened in subsequent operations by applying locally relatively small staying or reinforcing pieces. The application of these relatively small pieces to a particular portion of the shoe upper part is ex15 pensive as it involves a number of operations most of which must be performed by hand with skill and care. First the shoe upper part must be marked to indicate accurately the portion thereof which is to receive the small piece, whether 20 h is an overlay, underlay or a reinforcement. Then one face of the small piece must be rendered sticky, either by treating a prepared coating thereon or by applying adhesive thereto. Then the sticky piece must be superimposed upon the 25 shoe upper part, care being taken to cover the proper portion of the shoe upper part by registering the piece with the mark previously formed on the shoe upper part. Finally the assembled parts must be subjected to pressure to insure 30 the adherence of the superimposed piece to the underlying shoe upper part.

The object of the present invention is to produce a machine which will assemble unmarked component shoe upper parts in a rapid, reliable 35 and inexpensive manner.

To the accomplishment of this object, and such others as may appear hereinafter, the various features of the present invention consist in certain constructions, combinations and arrangements of ^υ parts hereinafter described and then set forth broadly and in detail in the appended claims.

The various features of the present invention will be understood readily from an inspection of 45 the acompanying drawings, illustrating the best form of the invention at present devised, in which,

Figure 1 is a view in plan of the assembling machine, the pick-up means being at the pick50 up station;

Fig. 2. is a view in front elevation;

Fig. 3 is a view in plan, the pick-up means being at the superimposing station;

Fig. 4 is a view in sectional elevation on the ⁵⁵ line 4—4, Fig. 3;

(CI. 12—52)

Fig. 5 is a view in plan illustrating a modification;

Fig. 6 is a view in elevation of the modified type of die illustrated in Fig. 5;

Fig. 7 is a detail view in sectional elevation of 5 the roll for rendering the bottom faces of the pieces of stock adhesive;

Fig. 8 is a detail view in sectional elevation illustrating the mechanism for lowering the roll during the idle stroke of the dies, and 10

Fig. 9 is a detail view in rear elevation of the mechanism for lowering the disappearing pins in a step by step manner.

In the embodiment of the invention illustrated in Figs. 1, 2, 3 and 4, the machine is set up to 15 support separately a pair of shoe upper parts herein shown as quarters 10, one right and the other left (Fig. 1), and a pair of stacks 11 (Fig. 2) of pieces of stock 12 (Figs. 1 and 3) herein shown as stays for reinforcing the quarters IG in the 20 region of the eyelet holes to be inserted therethrough in a subsequent operation.

The quarters i 0 are supported flat-wise upon the horizontal surface of a pattern 13 which is provided with one or more holes 14, herein shown 25 as four in number. The holes ί 4 receive vertical pins 15 projecting upwardly from the flat top of an elevated bed !G integral with a bed plate 17. With this construction the pattern 13 is removably mounted on the bed 16. 30

The stacks 11 are supported upon a pattern (8. For economy in manufacture the patterns (3 and 18 are standardized. The pattern 13 is provided with holes IS which receive vertical pins 20 projecting upwardly from the upper walls of a ³⁸hollow bed 21 on the bed plate (7. The walls of the hollow bed 2 ί form a box-like structure which is closed at its top by the pattern 18. The pattern 18 is provided with a plurality of eyelets 22 (Fig. 3) which embrace loosely a plurality of pins ⁴⁰23 (Figs. 3 and 4) which confine laterally the pieces 12 in the stacks ί I in all directions by engagement with various points on their edges. The stacks are thus supported in magazines each having a stationary bottom and a vertically ⁴⁵movable retaining wall. The bottom of the pattern 18 is reinforced in the region of the eyelets 22 by a backing plate 24 (Fig. 4). The bottom ends of the pins 23 are supported by a false bot- ₆₀tom 25 the edges of which engage loosely the internal walls of the hollow bed 21. The false bottom 25 rests on a horizontal plate 26. With this construction the location of the eyelets 22 may be varied as desired to change the shape or size _BBof the area bounded by the pins 23. Provided the ’

2,006,071

2) projecting downwardly from the bottom face of a flat plate 56 removably secured to a holder 57. To this end the plate 53 is provided with a pair of upstanding pins 58 which are received in holes formed in the holder 57. The pins 53 near 5 their upper ends are provided with notches engaged by latches 59 pivotally mounted on the holder. By swinging the latches 59 on their pivots the pins 58 are released so that the plate 56 may be withdrawn from the holder 57 and another 10 plate 56 carrying other dies 54 and 55 substituted therefor.

The dies 54 and 55 have flat bottom faces shaped in exact accordance with the shape of the pieces in the stacks ί (. The dies project below 15 the bottom of the plate 56 a distance commensurate with the distance the pins 23 project above the uppermost pieces in the stacks 11. With this construction the dies enter into the spaces defined by the pins 23 to engage the uppermost pieces 20 in the stacks, the extent of this movement being limited by the upper ends of the pins 23 which engage the plate 56.

The holder 57 is carried by the bottom of a rod 68 (Fig. 4) which slides vertically in a boss 25 6! formed in a head 62. The head 62 receives and slides upon two horizontal rods 63 and 64 the free ends of which are supported, respectively, in brackets 65 and 66 projecting upwardly from the bed plate 17. With this construction 30 the head 62 is constrained to- slide laterally in a single horizontal plane.

In order to reciprocate the rod 60 to lower the dies 54 and 55 into engagement with the top pieces in the stacks i2, the rod is slotted to 35 receive an arm 67 pivoted at one end on the head 62 and provided on its other end with an operating handle 68. The arm 67 and the parts operated thereby-are held normally in the position of Fig. 4 by a coiled spring 69 which is mount- &lt;0 ed in a spring chamber 70 formed in the head 62. The upper end of the spring 69 engages a pin 7 i depending from the arm 67.

In order to constrain the downward movement of the rod 60 to a single vertical plane the 45 horizontal rod 63 is provided with an opening 72 (Fig. 3) which, when the head 62 is positioned against a buffer 73 on the rod 63, is in position to receive a pin 74 mounted in an opening 75 formed in the head 62. The upper end of the pin 74 50 is pivoted between two plates 76 (Figs. 1 and 4) which are secured to the opposite sides of the arm 67.

In order to prepare for the operation of the machine the pattern maker designs paper pat- 55 terns having contours identical with the shoe upper parts to be supported upon the pattern i3. Each paper pattern has an opening cut therein having a contour identical with the pieces to be supported upon the pattern 18. Thus the paper GO patterns show not only the contours of the left and right shoe upper parts and the pieces to be superimposed thereon, but the exact position the pieces should occupy when superimposed upon the shoe upper parts. 65

With these paper patterns as guides, the dies 54 and 55, on the bottom of the plate 56, are constructed with surface contours identical with the openings in the paper patterns. Stated in. another way, the dies 54 and 55 are provided 70 with contours on their bottom faces, respectively, identical with the contour of the pieces to be applied to the shoe upper parts represented by the paper patterns.

In order to determine the proper location of 75 eyelets 22 are properly located, the operative may prepare the pattern 18 for the support of work pieces !2 varying widely in size or shape merely by dropping the pins 23 through the eyelets as the 5 bottoms of the pins 23 may rest upon any portion of the extensive surface of the false bottom 25.

Soldered to the bottom of the plate 26 are two horizontal rods 27 and 28 which are wider than the plate so that the ends thereof may project 10 into inclined slots 2S and 30, respectively, formed in the lateral side walls of the hollow bed 23. Pivoted to the horizontal rod 28 are two links 3i and 32 (Figs. 3 and 4) which are pivoted, respectively, on pins 33 and 34 carried by ears 35 and ,5 36 projecting upwardly from a slide 37 mounted to slide on the bed plate Π. Secured centrally to the slide 37 is a strap 38 which carries on its free end a roll 39 (Figs. 1, 3, 4 and 9) arranged to engage the peripheral edge of a verge 49. 20 The verge 40 is carried by a ratchet 31 rotatably mounted on the cylindrical shank of a horizontal bolt. 42 (Fig. 9). The shank of the bolt 42 is threaded on both ends to receive nuts 43 (Fig. 4) and 54 (Fig. 9) one of which, the nut 43, secures 25 the bolt to the rear wall of the hollow bed 21.

The bolt 44 holds the verge 43 and the ratchet 4i in position on the shank of the bolt ¢2. The roll 39 is held in engagement with the verge ¢0 by a pair of coiled springs ¢3 (Fig. 3) the ends of each30 of which are secured to the horizontal rod 28 and to pins 46 projecting laterally from the side walls of the hollow bed 2 i.

Shoe factory systems vary in the number of pairs constituting a case lot. In some factories .35 thirty-six pairs form a case lot. In others, twenty-four. In still others, twelve. The pins 23 (Fig. 4) are standardized. That is, they are long enough for use with a stack ! ί formed by thirtysix of the pieces 12. When a stack !f, contain4θ· ing less than thirty-six pieces of stock, is to be supported upon the pattern 88, the distance the pins 23 project above the work supporting surface of the pattern ί 8 is reduced so that the upper ends of the pins 23 may project above the top 45 piece of stock in the stack a predetermined distance, the amount of which is uniform for all heights of stacks and which is maintained uniform as the pieces of stock are withdrawn one at a time from the stack.

To enable the operative to adjust the pins 23 preliminarily to accommodate them to different heights of stacks ί J the shank of the bolt 42 carries loosely an arm 47 (Fig. 9). Normally the arm 47 is held against a pin 48, projecting from the 55 rear wall of the hollow bed 21, by a coiled spring ¢3 one end of which is secured to the rear wall of the hollow bed 2 ί and the other end of which is secured to a bent pin 53 secured to the arm 47. The arm 47 carries a pivoted spring pressed pawl GO 51 arranged to engage the ratchet 4 ί. The operative may, by oscillating the arm 47, operate the ratchet 41 in a counter-clockwise direction, viewing Fig. 9, through the pawl 5 ί, and thus rotate the verge 40. The verge 40 by engagement with ¢5 the roll 39 draws the slide 37 to the right (Fig. 4) thus causing the rods 27 and 28 to travel down the slots 29 and 30 and lower the plate 23 which supports the false bottom 25 upon which the pins ,,, 23 rest. The ratchet 4 i is held from a retrograde 70 movement, viewing Fig. 9, by a pivoted spring pressed pawl 52 mounted in a cage 53 secured to the rear wall of the hollow bed 21.

In order to withdraw the uppermost piece from &lt; both of the stacks ί ί simultaneously the pieces 75 are engaged, respectively, by dies 54 and 55 (Fig.

2,008,071 the quarters ί 0 and the stacks 11 on the patterns 13 and 18, respectively, these patterns, without anything on their exposed surfaces, are placed in position on the beds 16 and 21, respectively.

With the head 62 positioned at the pick-up station, as shown in Figs. T and 2, the handle 63 is pressed downwardly to force the dies 54 and 55 into contact with the pattern (8 to imprint, through carbon paper or otherwise, their conlo tour on the surface of the pattern 18. These imprints are used as guides to determine the location of the eyelets 22 for the pins 23 which confine, laterally the pieces 12 in the stacks 11 in all directions by engagement with various points on l.> their edges.

Then the handle 68 is elevated into the position of Fig. 4 and the head 62 is slid to the left (Fig. 1) to bring the left side end thereof in contact with a buffer· 77 (Figs. 1 and 2) as shown in Fig.

2o 3. When the head 62 is in contact with the buffer 77 the pin 74 is registered with a hole 73 in the horizontal rod 63 thus permitting the rod 63 to be reciprocated to bring the dies 54 and 55 into engagement with the exposed surface of the pat20 tern 13 and print or impress their contours thereon.

Then the paper patterns, hereinbefore referred to, are placed upon the pattern S3 and the edges of the openings in the paper patterns are reg30 istered with the imprints of the dies 54 and 55.

Next lines are scribed on the pattern 13 employing the available gaging edges of the registered paper patterns as guides. These available edges may be held to a grade. The scribed lines are 35 used to determine the location of the gages 79 and 83, of the bumper type, on the pattern (3.

As indicated in Fig. 1 portions of the stays (2 register with edges on the quarters. In many instances, however, the overlays, underlays or ίό reinforces generally are located within the marginal portions of the shoe upper parts supported on the pattern 13. Thus, the gages 75 and 89 gage the location of the shoe upper parts on the pattern 13 relatively to the dies 54 and 5E so 45 that any predetermined portion of the superficial surface of the said shoe upper parts may receive the pieces 12. It will be clear, viewing Fig. 4, that if the rod 60 is reciprocated to lower the dies 54 and 55 while the pin 74 is not in a 50 position to enter the openings 72 or 78, the pin will strike the rod 63 and so block further descent of the dies. In this maimer superimposing accuracy is assured because the operation of the pin 74 in the opinings 72 and 78 necessitates first 55 that the pieces 12 register accurately with the dies 54 and 55 and then that the pieces 12 he superimposed upon only the predetermined portion of the superficial surface of the shoe upper parts SO.

The gages 7S and 89 gage a complete series of shoe upper parts of the same style, one pair at a time, in position to receive in a uniform manner the pieces 12 which, however, are not graded in any way, they being the same size for all the 65 various sizes and widths in the complete series of shoe upper parts supported upon the pattern 13.

In order to enable the dies 54 and 55 to pick up the uppermost pieces in the stacks II and retain them in position while the pieces are being 70 transferred to and superimposed upon the quarters 19, the bottom faces of the dies 54 and 55 are provided with vertical air passages 81 and 82, respectively, (Fig. 2). The upper ends of these air passages 81 and 82 receive hollow fer- dies. 75 rules 83 and 84, respectively, carried by flexible conduits 35 and 86 communicating with a header 87. In addition to the conduits 85 and 86, the header 87 is connected to two more suction conduits 88 and 89. These conduits are not used with small dies like the dies 54 and 55, but the 5 ferrules on the lower ends thereof are fitted into blind openings 99 and 9! formed in the head 62.

The header 87 communicates with one end of a flexible conduit 92 (Fig. 1) the other end of which is connected with the intake of an air pump 93 10 mounted on the bed plate 17 and driven by the armature shaft ®4 of an electric motor S5. When the air pump 93 is in operation air is drawn through the openings 81 and 82 thus producing a condition of unbalanced pressure on the hot- 15 tom faces of the dies 54 and 55 which causes the uppermost pieces on the stacks to adhere to the dies when they are engaged therewith. The air drawn into ths pump 93 is discharged through an outlet 96. The suction pull on the 20 pieces engaged by the dies may be varied by a petcock 97 interposed in the suction line between the conduit S2 and the inlet to the pump 83.

The pieces ! 2 used for overlays, underlays, and reinforces generally, may be of three general 25 types, namely, thermoplastic, hydroplastic, or dry. By thermoplastic I mean that the face of the piece which is to engage the shoe upper part is coated with an adhesive normally nonadhesive under ordinary conditions of tempera- 30 ture but which is capable of being rendered tacky by the application of heat thereto. By hydroplastic I mean that the coating requires the application of water thereto in order to render it adhesive. By dry I mean that the bottom face 35 of the piece is uncoated and is rendered adhesive by the application of some sticky material such as latex, gum, paste, cement or the like.

If the pieces are hydro-plastic the machine is provided with a cylindrical roller 98 (Figs. 1, 2, 7 40 and 8) constructed of some moisture absorbent material, such as sponge rubber 99. The sponge rubber 99 is mounted on a core ! 86 which in turn is mounted on a shaft 101 having ends journaled on the bottoms of slots ί 62 formed on the 45 end flanges i03 (Fig. 1) of a small tank 194. Tire tank 194 is removably mounted within a holder Mils which in turn is removably mounted on. the bed plate Π in the space between the beds 16 and 21. The holder (05 (Fig. 1). is provided 50 with an outturned end flange ί 06 having a slot I SI therein which receives a pin ί 08, on the bed plate 17, to the upper end of which is threaded a butterfly nut ί03 for clamping the flange ICS to the bed plate Π. The holder iOS is provided also 55 with a slotted end flange ! ίθ (Fig. 2) which fits over a pin HI, on the bed plate !7, for engagement with a butterfly clamping nut H2.

When the dies 54 and 5S are moved into engagement with the uppermost hydroplastic pieces 60 on the stacks I ί, respectively, the suction produced by the air pump 93 causes the pieces to adhere to the dies and to leave the stacks upon the return of the dies to the position of Fig. 4. Then the-head'62 is reciprocated to the left (Figs. 65 1 and 2) to bring the picked-up pieces into the superimposing position of Fig. 3. As the dies move from the position of Fig. 1 to that of Fig. 3 the pieces wipe over the periphery of the roll 98 and the hydroplastic coating on the pieces is rendered 70 adhesive by the water on the roll. During the engagement of the pieces with the roll S8 the suction holds the pieces from displacement on the

After the head 62 is positioned as shown in Fig. 75

2,006,071 uniform distance above the uppermost pieces in the stacks until all the pieces are removed therefrom.

In order to control the lowering of the pins 23 automatically the arm 47 is provided with a 5 lug 123 which is engaged by a toe 129 formed on the lower end of the arm 127. Each time the head 62 is returned to the pick-up station the toe 129 strikes the lug 128 and oscillates the arm 47 to rotate the ratchet 41 and the verge 40. As 10 the verge 46 rotates, the roll 39 is moved to the right (Fig. 4) and the plate 26 is lowered an amount commensurate with the thickness of the pieces in the stacks. As this thickness may vary with the different types of work pieces 15 handled, the lug 128 is secured to one end of a screw 136 threaded into the upper end of the arm 47, the adjustment of the screw 130 being maintained by a winged clamping nut 131. From an inspection of Fig. 9 it will be understood that 20 the earlier the toe 129 engages the lug 128 in the return of the head 62 to the pick-up station the greater will be the rotative movement of the ratchet 41 and the consequent greater distance through which the plate 26 is lowered. The 25 peripheral edge of the verge 46 is shaped to permit the roll 39 to escape along a lateral wall 132 (Fig. 4), under the influence of the springs 45, when the pieces are all withdrawn from the stacks. Thus, the pins 23 are caused to pop up 30 through the eyelets 23 into their original positions ready to receive two more stacks of pieces ¢2 immediately upon the exhaustion of the stacks.

If the pieces in the stacks are the dry type 35 hereinbefore referred to, the tank 104 is supplied with the adhesive and the roll 98, or a substitute therefor, is then used to apply the adhesive to the bottom faces of the dry pieces as they are dragged across the periphery of the 40 roll by the dies.

If the pieces in the stacks are thermoplastic, the die holder 57 is provided with an electrical heating unit, (not shown), the terminals 133 and 134 (Fig. 1) thereof being connected to some 45 suitable source of electricity.

But whether the pieces in the stacks are thermoplastic, hydroplastic or dry, they are rendered adhesive during the travel of the dies from the pick-up station to the superimposing station. 50 The roll 98, the tank 104, or, it may be, the holder 105 therefor, may be removed from the machine during its use on thermoplastic pieces.

It is often desirable in the manufacture of shoes to apply a doubler to a shoe upper part. 55 Usually the doubler and the shoe upper part are the same size and shape so that it is necessary to register their edges in assembling them together. Owing to the porous character of the material from which the doubler is made it would 60 be impracticable to employ suction means for transferring the doubler from the pick-up station to the superimposing station. Therefore, in assembling a doubler and a shoe upper part together the doublers are supported, one at a time, 65 on a pattern 135 (Fig. 5) while a stack of shoe upper parts are supported on the pattern «8.

Owing to the grade of the doubler it is not practicable to employ gages of the bumper type like the gages 79 and 8®, Fig. 1. Instead, the 70 pattern 135 (Fig. 5) is provided with a line gage 136, with which certain edges on the doubler are registered. To this end the pattern 135 may be, and preferably is, the attachment illustrated in Fig. 4 of the drawings in my Patent No. 75

3, the dies are reciprocated to superimpose the sticky pieces upon the shoe upper parts supported upon the pattern 13. The pieces engage the underlying shoe upper parts with sufficient pres5 sure to cause the pieces to adhere substantially instantly thereto. As soon as the handle S3 is released the dies are elevated but the pieces are not carried upwardly by the dies, the adherence of the pieces to the shoe upper parts being sufii10 cient to break the suctional grip of the dies on the pieces.

Tn order to prevent the roll 98 from wetting the bottom faces of the dies as they return to obtain another pair of pieces from the stacks 11 15 for application to another pair of shoe upper parts positioned in the pattern 13, the machine is provided with mechanism for lowering the roll 98 to withdraw its periphery from the plane of reciprocation of the dies. To this end 20 the end flanges iGG and ISO of the holder 105 support for rotation a horizontal shaft ! ί 3 through which are threaded screws 114 (Figs. 7 and 8). When the dies are travelling from the pick-up station to the superimposing station the 25 tank «Θ4 is supported upon the heads of the screws 1 «4 (Fig. 7). When the dies are travelling back to the pick-up station the bottom of the tank IG4 rests upon the shaft I S3 (Fig. 8).

Tn order to oscillate the shaft I ί 3 in timed rela30 tion with the horizontal movements of the dies the rear end of the shaft I! 3 carries an arm 115 which is secured to the shaft by a screw 116. The movement of the shaft ί 83, in a clockwise direction viewing Fig. 7, is limited by a stop pin 35 ΙΠ projecting rearwardly from the rear flange 106 of the holder 105. This stop pin insures the uniform elevation of the roll 98 to bring its periphery into the horizontal plane of movement of the dies.

The arm 115 is provided with a slot 118 which embraces a pin 119 projecting laterally from a slide 120. The slide 120 is provided with slots 121 (Fig. 2) which embrace the shanks of small headed bolts 122 (Fig. 1) secured to brackets «23 45 (Fig. 3) secured respectively to the beds 16 and 21. At its opposite ends the slide 120 is provided with upstanding lugs 124 and 125 (Fig. 2) arranged in the path of movement of a pin 126 (Fig. 4) projecting laterally from an arm 127 50 depending from the head 62. When the head 62 is reciprocated into the position of Fig. 3 to bring the dies into the superimposing station the pin 126 strikes the lug 124 and moves the slide to the left (Figs. 1 and 2) thereby oscillating, 55 through the connections described, the shaft 113 into the position of Fig. 8. When the head 62 is reciprocated back into the position of Fig. 1 the pin 126 strikes the lug 125 and moves the slide ί20 to the right (Figs. 1 and 2) thereby os60 cillating the shaft 133 into the position of Fig. 7.

Thus the roll 98 is elevated for the passage of the dies thereover from the pick-up station to the superimposing station, and is lowered for the return of the dies to the pick-up station.

When the head 62 is moved back into the pickup station another pair of shoe upper parts is placed on the pattern 13 against the gages 79 and 80 and the cycle of operations is repeated. As described hereinbefore the pins 23 by engage70 ment with the plate 56 limit the downward movement of the dies. After one piece has been removed from each of the stacks it is necessary to lower the plate 26 a distance commensurate with the thickness of the removed pieces so that the ⁷⁵ upper ends of the pins 23 may be maintained a

2,006,071

1,881,399, October 4, 1932; The pattern 18 supports a stack of shoe upper parts 137 (Fig. 5) having the same shape and superficial area as the doubler. These shoe upper parts 137 are 5 engaged by the pins 23 to form the stack.

When using the machine to pick-up the shoe upper parts 137 from the stack oil the pattern 18 a flat die ί 38 is secured to the holder 57 by means of the latches 5S which engage the vertical pins 19' 58 projecting from the back face Of the die 138. The oke IS?; is provided With a number of air passages ί38, any selected four of which may be connected to the four conduits 85, 86, 88 and 89.

After the die 138 picks up the shoe upper part 15 it is transferred to the superimposing station where the shoe upper part is superimposed upon the doubler. In between the stations the shoe upper part is rendered adhesive in the manner hereinbefore described with reference to the 2(! pieces 12.

Nothing herein explained is to be interpreted as limiting the various inventions in the scope of their appplication to use in connection with the particular apparatus or : the particular 25? mode of operation or both selected for purposes of illustration and explanation. While the particulars of construction herein set forth are well suited to one mechanical form of the invention, it is not limited to these details of 3(): construction, nor to the conjoint use of all its features, nor is it to be understood that these particulars are essential since they may be modified within the skill of the artisan without departing from the true scope of the actual in33? ventions, characterizing features of which are set forth in the following claims by the intentional use of generic terms and expressions inclusive of various modifications.;