US1080943A - Leather-rolling machine. - Google Patents

Description

H. W. WINTER.

LEATHER ROLLING MACHINE.

APPLICATION FILED MAR. 28, #310. 1,080,943.

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3 II I 4 5 H Mum PLANOGRAPH co wAsmNuT N Patented Dec. 9, 1913.

H. W. WINTER.

LEATHER ROLLING MACHINE.

APPLICATION FILED MAR. 28, 1910.

1,080f,94;3, Patented Dec. 9, 1913.

4 SHEETS SHEET 2.

[Mm/5555s WVT/VTUQ- H. W. WINTER.

LEATHER ROLLING MACHINE.

APPLICATION FILED MAR. 28, 1910. 1,08%943, Patented Dec. 9, 1918.

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H. W. WINTER.

LEATHER ROLLING MACHINE.

APPLIOATION FILED MAR.2B, 1910.

1,080,943, Patented Dec. 9, 1913.

4 SHEETS-SHEET 4.

TlNTTE STATES? PATENT QET TQE,

HENRY W. WINTER, OF METI'IUEN, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A GORPORATION OF NEW JERSEY.

LEATHER-ROLLING- MACHINE.

Specification of Letters Patent.

PatentedDec. 9, 1913.

To all whom it may concern:

Be it known that I, HENRY W. WINTER, a citizen of the United States, residing at dot-linen, in the county of Essex and State of Massachusetts, have invented certain Improvements in Leather-Rolling Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to leather rolling or pressing machines, and especially to certain improvements in machines of the type disclosed in United States Letters Patent No. 638,862, dated December 12, 1899. The invention is herein shown as embodied in such type of machine for purposes of illustration, but it is to be understood that the invention is not limited to use therewith but may be employed in connection with many other forms of rolling machine.

In the machine of the prior patent referred to the leather, or other stock, is passed between two power-driven rolls the lower one of which is carried by bearings mounted to slide in vertical guideways in the machine frame, and through a treadle and suitable connections said roll is elevated to hold the stock against the upper roll. Under this arrangement the pressure to which the stock is subjected is controlled by the workman, who is required to keep his foot on the treadle as long as the machine is in operation, but must release and apply such pressure at times to raise the roll, or permit it to fall, as the stock varies in thickness. This calls for the expenditure of considerable physical energy, and imposes an exhausting strain upon the workman which has proved to be very objectionable.

In order to overcome this and other 0bjections, the present invention contemplates, as one of its principal objects, the provision of an improved means for holding the lower roll against the stock as it passes between the two rolls of the machine, so as to relieve the workman of the necessity for holding his foot on the treadle. In the illustrated embodiment of the invention this means comprises an arrangement of toggles, each having connection at one end with a fixed partof the machine and at its other end wit-h a lever or other suitable device connected with the lower roll, and yielding devices, herein shown as strong springs, which normally act through the toggles and their connections to lift the lower roll. The arrangement of these springs relatively to the toggles is such that when the toggles are extended, and

.hence the leverage exerted in a direction to lift the roll is most effective the springs will be under the least amount of compression, and as the leverage of the toggles is diminished by a downward movement of the roll due to the passage of stock of increasing degrees of thickness, the amount of compression of the springs will be proportionately increased. From this arrangement it follows that the stock will be subjected to substantially the same amount of pressure as it passes through the rolls irrespective of the amount of separation of the rolls due to variation in thickness of the stock, and the lower roll will be held up to maintain the pressure on the stock between the rolls by devices capable of yielding to automatically provide the proper amount of space between the rolls, in accordance with the gage of the stock. The pressure exerted through the connections described to hold the lower roll. against the stock may be varied to meet different requirements of the stock by suitable devices, under manual control, for adjusting the normal amount of force exerted by the springs on the toggles. In the preferred embodiment of the invention, each of these springs surrounds a rod which is connected at one end with the pivot joining the two members of one of the toggles, and the opposite end of the rod has sliding engagement with a sleeve carried by a vertically movable head, which is caused to move in opposite directions through a screw having geared connections with a hand wheel. The spring is confined between the sleeve and an abutment at the lower end of the rod, and as the head is adjusted the collar slides on the rod, and varies the amount of compression of the spring,

In the machine of the prior patent above referred to the mechanism for holding the lower roll against the stock as it passes between the rolls comprises a treadle-actuated cam which acts upon the lower arms of two bell-crank levers whose upper arms support, respectively, two plates upon which rest the vertically sliding bearing blocks for the lower roll. In adapting the present improvements to such machine, the free ends of the toggles are arranged for connection, respectively, with the bell-crank levers, and the strong springs referred to act through said parts to hold the lower roll against the stock. As the work escapes from between the rolls, the sudden expansion of the springs would tend to cause a sharp rebound of these connections and subject the machine to an injurious shock. with a view to pre venting this, an important feature of the.

invention lies in the provision of suitable means which is arranged to act on the toggles in opposition to the force exerted by the main springs, previously described, to cushion the rebound of the toggles and other connections between the springs and the lower roll. Preferably, such means comprise suitable spring-controlled levers, each having an arm which is yieldingly held against the toggle with which it is associated, and is so arranged in relation thereto as to prevent the toggle from being suddenly straightened.

Another important feature of the invention consists in an improved arrangement of parts for relieving the stock from the pressure of the rolls independently of the devices for maintaining such pressure. Preferably such arrangement comprises a treadle, or other manually operable member, which has connection through suitable clutches with the bell-crank levers heretofore referred to. In the normal position of these several parts the treadle is elevated and the clutches are free from operative engagement with the shafts through which the treadle acts on the bell-crank levers. When it becomes necessary to relieve the pressure upon the stock, as for instance in case the stock should run crooked or be doubled between the rolls, the workman steps upon the treadle which renders the clutches operative and then by a succession of strokes, he effects movement of the bell-crank levers and toggles in opposition to the force of the main lifting springs, which permits the lower roll to fall. This arrangement is advantageous in that it provides manual means for effecting a downward movement of the lower roll to release the stock independently of the means for maintaining the pressure of the rolls against the stock, and in a manner which is less fatiguing and more desirable than where the lower roll is raised or lowered by a single stroke of the treadle.

Other features of the invention, including important details of construction and combinations of parts, will be hereinafter more particularly described and claimed.

In the drawings: Figure 1 represents, in side elevation, a machine embodying the present invention; Fig. 2 represents the same machine in front elevation; Fig. 3 is a perspective view of some of the principal features of the invention, with certain parts broken away, said view being on a larger scale than Figs. 1 and 2; Fig. 4 is an enlarged perspective View, partly sectional, of one of the clutches; and Fig. 5 is a vertical longitudinal section.

In the drawings, 1, 1, indicate the end standards constituting the main frame for supporting the working parts of the machine, the upper portions of which are provided with bearings for the trunnions of the upper roll 3, and also formed to provide guideways to receive suitable blocks 19, which serve as bearings for the trunnions of the roll 5 and are vertically slidable in the guideways to permit the roll 5 to move toward and from the roll 3. A main driving shaft 7 is rotatably supported in bearings sustained by rigid extensions of the standards 1, 1, and carries a fast pulley 9, a loose pulley 11, and a fly-wheel 13. The driving shaft 7 also has fast thereon a suitable pinion (not shown) which meshes with a gear 15 secured to an extension of one of the trunnions of the lower roll 5, and near its opposite end said shaft carries another pinion which meshes with an idler pinion whose teeth engage with the teeth of a gear 17, fast on an extension of a trunnion of the upper roll 3. By this, or a similar arrangement of geared connections between the power shaft 7 and the rolls, when said shaft is rotated in a given direction by power applied through a belt or the like, the rolls will be caused to rotate in opposite directions. It will also be ap parent that as the shaft 7 and the pinion carried thereby which meshes with the gear 15 are in the same horizontal plane as the axis of said gear, the latter may rise and fall with the lower roll for a limited distance without disturbing the operative connection between said roll and shaft.

The bearing-blocks 19 are shown as provided with recesses to receive the upper ends of plates 27, whose lower ends are supported upon the arms 25 which are pivotally carried by studs 23, secured in brackets 24: on the end standards 1. The studs 23 are also shown as pivotally sustaining the curved arms 21, which project downwardly, and as herein represented are pivotally connected at their lower ends through pins 61 with crank arms 59, which are respectively fastened to shafts 57. The shafts 57 turn freely in bearings carried bybrackets 58, which are shown as being supported at opposite sides of the frame from cross-braces 2, but they may be supported from any other suitably located rigid part of the main frame. The arms 21 and 25 constitute bell-crank levers to effect, in connection with devices to be hereinafter described, the vertical movements of the roll 5. The arms 21, near their upper ends,

are preferably threaded to receive, respectively, the right and left threaded adjusting screws 29, 30, whose outer ends bear against the inner surfaces of the arms 25, the adjustment of said screws serving to raise or lower the outer ends of the arms, and hence also the roll 5, in order to adjust the distance a between the rolls in accordance with variations in the thickness of the stock. The screws 29, 30, are shown as being connected at their inner ends with the members 31 and 33 of an extens-i'le shaft, the screw 29 being connected with the member 33 by a universal joint 35-, and the screw 30 with the member 31 by a similar joint (not shown). For conveniently rotating the extensile shaft to cause simultaneous rotation of the adj usting screws, the member 31 is shown herein as having fast thereon a sprocket 37, over which passes a chain 38 which also passes over a sprocket 40, carried by a shaft 140, which has bearing in a sleeve carried by a plate 41, pivotally connected through a pin 43 with a bracket 45 projecting from one of the frame standards. The outer end of the shaft 140 is shown as carrying a sprocket 39, over which passes a chain 47 said chain also passing over a sprocket 49, carried by a shaft 53, which has bearing in the sleeve of a bracket 51, projecting from a part of one of the frame standards. The shaft 53 carries a hand-wheel 55 which is shown as, and preferably will be, located above the upper roll 3, so as to be in position for con venient operation by the workman as he stands in front of the machine where he can observe the stock, and then readily adjust the distance between the rolls for variations in the thickness of the stock as such stock passes from the work table 4 between the rolls.

The means for holding the lower roll against the stock will now be described.

Each of the arms 21 is preferably pivotally connected at or near its lower end, by a pin 63, with the free end of a toggle comprising the members and 67, the inner end of the member 67 of which is pivoted at 69 to a rigid part of the main frame, as, for instance, to a stud or projection 71. The members of the toggle are shown as being pivotally joined by a pin 73, which also serves to pivota'lly connect to the toggle members a yoke from which rigidly projects a rod 74. The upper end portions of the rods 7 4 slide in bores formed in sleeve 77 car ried by a bracket 79 which projects from the upper end of a plate 81. This plate is adapted to slide vertically in guideways 83 carried rigidly by a longitudinal brace-member 116, connected with the standards 1, 1. Encircling each rod 74 is a strong spring 85 whose ends are confined between the yoke 75 on said rod and the sleeve 77 through whi:ch it slides, and said springs are normally under a certain amount of compression and act upon the toggles with a force which tends to straighten them. This force is transmitted from the toggles to the.

bellcrank levers, and thence through the plates 27 to the movable bearing blocks of the lower roll to hold said roll against the stock. The presure of the springs '85 is so applied to the toggles that as thicker portions of the stock passing between the rolls cause the movable roll to move away from the stationary roll the springs will be compressed in proportion to the diminished leverage of the toggles due to the angular position of the members 65 and 67; and conversely, as thinner portions of the stock pass between the rolls, the increased leverage due to the straightening of the toggles is accompanied by a proportionate reduction in the pressure exerted by the springs as they are permitted to expand. It will thus be seen that the pressure applied to the stock, with any given adjustment of the tension of springs 85, is substantially uniform in all ordinary variations of the space between the rolls due to differences in the thickness of stock. I regard this as a very important feature of my invention. The bracket 7 9 is shown as being provided with a bore to constitute a bearing for a shaft 87 whose outer end carries a hand-wheel 88, and a bevel gear 89 is fast tothe inner end of said shaft and meshes with a bevel gear 91 carried at the upper end of a vertical shaft 193 which is rotatable in a bearing carried by the plate 81. The lower portion of the shaft 193 is provided with an external thread which engages an internal thread formed in a part carried by the brace 116. By the construc tion described, it will be seen that when the hand-wheel 88 is turned in either direc tion the described geared connections will impart rotation to the threaded shaft 92 which will cause the plate 81 to feed in a downward or upward direction in its guideways, and thereby adjust the sleeve 7 7 along the rods 74, to increase or diminish to the desired extent the compression of the springs 85. The force of the springs, being applied through the toggles and the bell-crank levers, is very powerful, and maintains the lower roll against the stock with a pressure which is suflicient to effectively flatten and smooth out all the wrinkles and inequalities in the stock without requiring the workman to bear down on a treadle, or other manually operable device; and such pres sure is variable, by the devices described, to meet all conditions of the stock that may be presented.

In case the stock should run crooked in the machine or become doubled up between &

the rolls, means are hereby provided for enabling the workman to release the pressure upon the stock by effecting a desired amount of separation of the rolls. Preferably, such means comprise treadle-actuated mechanism, including clutches of the intermittent-grip type, which are normally free from operative engagement with the shafts 57, but are arranged to connect the treadle with said shafts when the workman steps upon the treadle. The shafts 57 are each shown as having an enlargement or collar 58 fast thereon, which is surrounded by the interiorly chambered hub 105 of a lever 104, constituting a clutch member, which has bearing upon the end portion of the shaft and is free to turn thereon except when locked to the shaft, in a manner to be described. The inner surface of each hub 105 is formed with a series of recesses 109 each of which receives a loose roller 107, said rollers being located between the hub and collar. The interior of each hub is furthermore shaped to provide a series of tapering recesses 128 between said hub and the col lar 59, which respectively communicate with the recesses 109. A clutch-controller 111, having a loose bearing on the shaft 57, is

provided with an annulus 112 fitting in the space between the hub and collar, and such annulus is formed with spaces 113 which receive the rollers 107. Each annulus is provided with a recessed extension 115 which receives the end of a clutch-controller lever 110, fulcrumed by a pin 112 to the lever 104. The opposite end 111 of the clutchcontroller lever is arranged to extend along the upper side of the inner end of the lever 104, and is located, together with the end of said lever, between the upper and lower flanges of a sliding block 102. Springs 108, arranged between the ends 106 of the levers 104 and the inner ends of the levers 110, serve to normally maintain the outer ends of the levers 110 depressed and the clutchcontrollers in position to hold the rollers in the recesses 109 so that the shafts 57 are free to turn in either direction independently of the levers 104. Springs 106 are shown as being located between the lower flanges of the block 102 and the ends 106 of the levers 104 to provide a yielding engagement between these parts, and stop-screws 130 are threaded into the frame and serve to adjustably limit the upward movements of said levers. The block 102 is connected with a treadle lever 93, fulcrumed on a pin 97 secured to the frame and having thereon a treadle 95, and springs 99, which are shown as being connected at one end to said lever and at the other end to a frame brace member 126, by suitable pins or other anchoring devices 100, act normally to hold the treadle in an elevated position. If the workman desires to relieve the pressure of the rolls upon the stock he depresses the treadle, whereupon the block 102, which is thereby carried down, first acts upon the inner ends of the levers 110 to rotate the clutch controllers and move the rollers out of the recesses 109 into the tapering recesses 128 of the clutch member 105. Upon a continuation of the downward movement of the treadle the levers 104 are actuated and the clutch members 105 cause the rollers to grip the collars 58, to effect rotation of the shafts 57 in a direction to swing the lever arms 21 inwardly, and permit the roll 5 to fall, the form of the recesses 128 being such as to relieve the gripping engagement between the parts of the clutch and the collar when the treadle is raised, whereby the roll may be lowered by a series of strokes of the treadle. When the workman desires to resume the pressure of engagement between the rolls and stock, he steps 0d of the treadle which permits the springs 99 to .raise the treadle lever, the block 102, and parts connected therewith, until the levers 104 come in contact with the stop-screws 130 and are arrested, when the block will continue to rise a short distance, thereby relieving the pressure upon the levers 110 and permitting the springs 108 to expand and act upon the levers 110 to thereby cause the clutch-controller to be rotated to position the rollers 107 in the recesses 109. The shafts 57 will then be free to rotate in either direction, as

the lower pressure-roll 5 rises and falls under the influence of thesprings 85, and the variations in the thickness of stock.

The rebound of the bell-crank levers is cushioned by the levers 117 which are shown as being fulcrumed on pins 118 secured to the frame, and the springs 120 which are compressed between the rear ends of said levers and a part of frame brace member 116 opposite said ends. The forward. ends 124 of these levers are extended beneath and normally bear against the pivotally connected inner ends of the toggle members, as shown. Stop screws 122 are threaded into openings formed in the rear end portions of the levers 117, and serve, by contact with the frame brace member 116, to adjustably limit the extent of movement imparted to the toggles by their springs 85 in a direction tending'to straighten said toggles. The springs 120 act in opposition to the springs 85, and when a piece of stock passes out from between the rolls and the compression of the springs 85 is released, the force due to their sudden expansion is checked or cushioned by the springs 120, and the shock which would otherwise be imposed upon the several connections between the springs and rolls, is absorbed.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, bell-crank levers to sustain said bearings, toggles connected with said levers, and yielding means acting onsaid toggles for holding said roll in a position of pressure.

,2. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, levers to sustain said bearings, toggles connected with said levers, and yielding means acting on said toggles, the parts being so arranged that the pressure exerted by said means through said connections is substantially uniform in all positions of the toggles.

3. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls,levers to sustain said bearings, means for determining the distance between 'the rolls, toggles connected with said levers, and yielding means acting to extend said toggles for holding the movable roll in a position of pressure.

l. In a machine ofthe class described,-the combination with pressure rolls, of movable bearings for one of said rolls, levers to sustain said bearings having independently movable arms, means for relativelv adjusting said arms to vary the distance between the rolls, toggles connected with said levers, and yielding means acting on said toggles to hold the movable roll in a position of pressure.

5. Ina machine of the class'described,the combination with pressure rolls, of movable bearings for one of said roll-s, levers to sustain said bearings, toggles connected with said vlevers, independent compression springs acting to straighten the toggles and thereby hold the movable roll in a position of pressure, a treadle, and connections including an intermittent clutch, for relieving the pressure of said springs on said roll.

6. In a machine'of the classdescribed, the combination with pressure rolls,'of movable bearings for one of said rolls, yieldingmeans for holding said roll in a position of pressure and means for manually moving said roll to relieve the pressure on the stockcomprising, a treadle, and connections including a normally free clutchbetween said roll and treadle.

7. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, yielding means for holding said roll in a position of pressure and means for manually moving said roll to relieve the pressure-onthe stock comprising, a treadle, and connections including a clutch between said roll and treadle,

the parts being so arranged that the clutch is free when the treadle occupies a raised position but is rendered operative when the treadle is depressed.

8. In a machine of the class described, the

combination with pressure rolls, of movable bearings for one of said rolls, yielding means for holding said roll in a position of pressure, connections including a toggle between said yielding means and the movable roll, a

treadle, and connections between said roll and treadle including an intermittent-grip clutch for applying manual power to the toggle inopposition to said yielding means, said clutch being free when the treadle occupies a raised position but being rendered operative when the treadle is depressed.

9. In a machine of the class described, the combination with pressure rolls, of movable bearings forone of said rolls, a toggle having connection with said roll, a yielding device arranged to act on said toggle to eX- tend its members and thereby hold said roll in a position of pressure, and means acting in opposition to said device to cushion the rebound ofithe toggle when the stock escapes from the rolls.

10. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, toggles having connection with said roll, yielding devices arranged to act on said toggles to extend the members thereof and thereby hold said roll in a position of pressure, and yieldingly-actuated levers arranged in position to cushion the rebound of the toggles upon release of the pressure between the rolls.

11. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, toggles having connection with said roll, yielding devices connected with said toggles and arranged to extend the members thereof and thereby hold said roll in a position of pressure, yieldingly-actuated levers pivoted to the frame of the machine and having arms arranged beneath said toggles, and means to adjustably limit the movement of said levers.

12. In a machine of the class described, the combination with pressure rolls. of movable bearings for one of said rolls, levers fulcrumed to the frame of the machine and having arms to support the movable roll, toggles connected with the other arms of said levers, yielding'devices arranged to act on said toggles'to extend the members thereof and thereby hold said roll in a position of pressure, and means for cushioning the rebound of said toggles upon release of the pressure between the rolls.

13. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, toggles having connection with said roll, rods con nected with the pivots joining the members of said toggles, and independent springs surrounding said rods and arranged to act on the toggles and hold the movable roll in a position of pressure.

14-. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, levers pivoted to the frame of the machine and having one arm arranged to support said bearings, toggles having connection with the other arm of said levers, rods connected with the pivots joining the members of said toggles, springs surrounding said rods, and means to control the compression of sai springs.

15. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, toggles having connection with said roll, rods attached to the pivotal connection between the members of each toggle, springs surrounding said rods, a slide arranged for movement in the frame of the machine and carrying sleeves movable on said rods, and means under the control of the operator for adjusting the slide to thereby vary the amount of compression of said springs.

16. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, levers having arms to support said roll, toggles connected at one end with the frame of the machine and at the other end with said levers, yielding means arranged to act on said toggles, shafts having bearing in the frame and carrying cranks pivotally connected with said levers, clutch members mounted on said shafts, arms turning on said shafts and carrying cooperating clutch members free from engagement with the shaft when the treadle is raised, a treadle having connection with said arms, means for elevating said treadle, and means to effect engagement of the clutch members when the treadle is depressed.

17. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, two-part levers for supporting said bearings, means for causing a pressure between said rolls, oppositely threaded screws for relatively adjusting the two parts of said levers, an extensile shaft connecting said screws, a manually-controllable device arranged in an ele vated position at the front of the machine for operating said shaft, and connections between said device and shaft.

18. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, two-part levers for supporting said bearings, means for causing a pressure between said rolls, op-

positely threaded screws for relatively adjusting the two parts of said levers, an extensile shaft connecting said screws, a device supported in an elevated position at the front of the machine so as to be convenient for operation to efiect rotation of said shaft, and connections between said device and shaft. v

19. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, two-part levers for supporting said bearings, means for causing a pressure between said rolls, oppositely threaded screws for relatively adjusting the two parts of said levers, an extensile shaft connecting said screws, a sprocket carried by said shaft, a bracket supported from the frame of the machine, a shaft having bearing therein and carrying a sprocket, a chain connecting said sprockets, a second bracket supported from the frame and arranged to extend in front of the machine, a shaft having bearing in said bracket, a hand-wheel carried by said shaft, and connections between said two last-named shafts.

20. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, and means for holding said roll in a position of pressure comprising toggles each having one end connected with a fixed part of the frame and its other end connected with said roll, and independent compression springs applied to the connections betwen the members of the toggles and acting normally to extend said members.

21. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, levers having an arm connected with said roll, toggles connected with the other arm of said levers and with the frame of the machine, and a separate compression spring applied to each connection between the members of the toggles and acting to extend said members.

. 22. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, means for holding said roll in a normal position of pressure comprising a toggle and a compression spring acting on the toggle to extend its members, and means for manually relieving the pressure between the rolls comprising a treadle and connections including an intermittent clutch adapted to permit the operator to separate the rolls by a plurality of downward movements of the treadle applied in succession.

'23. In a machine of the class described, the combination with pressure rolls, of movable bearings for one of said rolls, toggles having connection at one end with a fixed part of the frame, connections intermediate said bearings and the other end of said tog- In testimony whereof I have signed my gles, springs acting to extend the toggles name to this specification in the presence of 10 and hold said roll in a normal position of tWo subscribing Witnesses.

pressure, and a treadle and connections in T eluding an intermittent gripping clutch for HENRY efiecting successive pressure-relieving move- Witnesses:

ments of the movable roll in opposition to CHESTER E. ROGERS,

the force of said springs. LAURA M. GOODRIDGE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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