US 2116143 A
Abstract available in
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Description (OCR text may contain errors)
may 3, 1938.
J. M. DEWEY 2,116,143 PRESS OPERATING MECHANISM Filed July 12, 1935 4 Sheets-Sheet l INVENTOR ATTO N EY5 May 3, 1938. J. M. DEWEY PRESS OPERATING MECHANISM Filed July 12, 1935 4 Sheets-Sheet 2 INVENTOR JAMES M. DEWEY B 9L TTORNEKS May 3, 1938.
J. M. DEWEY PRESS OPERATING MEcHAN'IsM Filed July 12, 1935 4 Sheets-Sheet 5 INVENTOR JAMES M. DEWEY BY 76/4 8,
9 M NEY5 W May 3, 1938. J. M. DEWE Y' PRESS OPERATING MECHANISM Filed July 12, 1955 4 Sheets-Sheet 4 INVENTOR JAMES M. DEWEY w, #fly 9 77/17:
AT ORNEYJ Patented May 3, 1938 PRESS OPERATING MECHANISM Application July 12, 1935, Serial No. 31,088
This invention relates to a pressing machine of the typeused in laundry and garment work and to operating and control mechanism therefor.
My improved pressing machine provides a pair of coacting pressing members and power mechanism for closing them, the power mechanism having low-power and high-power motion transmitting mechanisms effective respectively during the early and later portions of the press closing movement. The control mechanism is arranged with a part normally in position where it disables or renders ineffective the high-power mechanism and the control means is so arranged that both hands of the operator are occupied in rendering this high-power mechanism effective so that the operator cannot be injured at the time the highpower mechanism becomes operative to close the press.
My improved mechanism also provides an arrangement of the type just described in which the high-power mechanism is not onlyineifective to produce heavy pressure between the pressing members but the press closing mechanism as a whole is ineffective to completely close the pressing members if the disabling part mentioned in the preceding paragraph has not been moved to its efiective or operative position. This not only prevents the operator from having a hand crushed between the pressing members but also prevents any damage whatsover to the operators hand in case it should be inadvertently between the members as they start to close. l
Other features of my invention include the novel arrangements of the parts of the press closing mechanism and of the control mechanism therefor as more fully set forth in the accompanying specification and as illustrated in the drawings.
In the drawings, Fig. 1 is an end elevation of a pressing machine embodying my invention, the pressing elements being shown in open position and the operating and control mechanism being shown in section and somewhat diagrammatic to more clearly illustrate the same; Figs. 2 and 3 are views similar to Fig. 1, showing two steps of a false operation of the machine occurring when the disabling part of the mechanism has not been moved to operative position; while Fig. i shows the pressing machine completely closed upon a proper operation of the same.
My invention is shown applied to a pressing machine of the scissors type having a stationary pressing bed and a coacting head movable by a power lever into and out of engagement with the bed. However, it will be understood that the principles set forth here are equally applicable to other types of pressing machines as will be readily understood by those skilled in this art.
In the machine illustrated, a frame is supports on an upstanding pedestal ii a pressing bed i2. On a bracket of the frame is mounted a head lever i3 pivoted to the frame at M intermediate its ends. Upon the forward end of the head lever is a pressing head or chest i5 adapted to coact with the bed 82 in a pressing operation.
Either or both of the pressing members may be supplied with a heating medium as desired.
Power means is provided for closing the press and in the present instance this comprises a cylinder and piston motor i6 pivotally mounted at ill on a bracket connected with the frame it. The motor comprises a cylinder that in which reciprocates a piston 562) connected by a piston rod Ito with mechanism for operating the head toward and away from the bed. The cylinder 2b is provided with a leak port Hid at its rear end for a purpose later described. This head operating mechanism comprises both low and highpower motion transmitting mechanisms, the lowpower mechanism being effective to move the pressing head at a relatively high rate of speed toward the bed but not into engagement therewith, while the high-power mechanism automatically becomes eifective during the latter part of the head closing movement and moves the pressing head at a relatively low rate of speed but with greatly increased power applied there to during the final closing movement of the pressing members. The arrangement shown comprises a second lever iii of bellcrank shape pivotally mounted at i9 upon the head lever. The longer arm Ma of this bellcrank is pivotally connected at 2G with the piston rod Etc already described. The shorter arm Mb of the bellcrank carries a follower BE in the form of a roller which travels upon a suitably arranged cam connected with the pressing machine frame, this cam having astationary part 22 and a movable part 23. The bellcrank lever is is normally biased in a clockwise direction by a spring 23 connected between the arm Eda of the bellcrank and a bracket on the head lever. The press head is normally biased toward its open position by a spring 25 connected between the head lever and a part of the frame. the movement of piston ltb at opposite ends of its stroke.
The movable cam part 23 has an interlocking sliding engagement with guideways 28 on the frame and is movable along these guideways into 55 Spring members 26 and El cushion and out of operativeposition by a small cylinder and piston motor 29. This motor has a cylinder 29a in which reciprocates a piston 291) whose piston rod 290 is pivotally connected with the part 23. A spring 39 biases the cam part toward inoperative or ineffective position and a stop mem ber 3| limits the movement of part 23 so that upon actuation of motor 29 the part 23 becomes in effect a continuation of the stationary cam portion 22. The cam portion 22 has an end shoulder 22a and the cam part 23 has an end shoulder 23a, the effect of which will be presently described.
Motive fluid is supplied to motor Hi from a source of fluid supply 3?. by way of conduit 33, valve mechanism 34 and conduit 35. Pressure fluid is supplied to motor 29 by conduits 32 and 33, valve mechanism 36 and conduit 31. The mechanisms 34 and 33 are similar and one only will be described. Valve mechanism 34 comprises a casing which houses a normally closed inlet valve 34a and a normally open outlet valve 3% mounted upon a common stem 34c and held in their normal position by a spring 3401. A lever 34c serves to transmit motion from a servo motor 34 to the valve stem 340 to actuate the valves when the servo motor is energized. A manual 349 is provided for hand operation of the valves. Servo motors 34 and 35f are energized automatically upon predetermined travel of the piston Nib. The parts provided for this purpose are here shown as a port 38 suitably located in the Wall of cylinder Hi0. and communicating by conduit 39 and branch conduits 39a and 3% with servo motors 34 and 36) respectively.
The operation of the mechanism with the parts in the position of Fig. 1 is as follows: The operator arranges the lay of the work upon the bed l2 and actuates manuals 34g and 36g. This closes valve 34b and opens valve 34a so as to supply motive fluid to motor I6 through the conduit 35. Piston |6b begins its power stroke moving rearwardly or to the left as viewed in the various drawings. The power is applied at the point 20 and has a tendency to rotate the bellcrank H3 in a counterclockwise direction about its pivot l9. However contact between the follower 2| and the stationary cam portion 22 prevents such motion so that the levers l3 and I8 move as a unit in press closing direction. The head at this time is being moved by a power arm which corresponds to the distance between the points 20 and I4. Simultaneously with the actuation of manual 349, manual 36g was operated which closed valve 36b and opened valve 36a to supply motive fluid through conduit 31 to the motor 29. The piston 29b thereupon made a stroke upwardly until it engaged stop 3| at which time cam part 23 is held in alignment with cam portion 22 as shown in Fig. 4. The follower 2| therefore continues along cam portions 22 and 23 until the follower passes over the heel of the part 23 onto the shoulder 230.. When this occurs relative movement is possible between bellcrank I8 and head lever l3 so that the bellcrank moves in a counterclockwise direction as shown in Fig. 4, at which time the follower 2| acts as a fulcrum against the shoulder 23a and power is applied to the head lever l3 at the point l9 through the multiplication afforded by the long and short arms of the bellcrank lever. Also at this time the leverage applied to the head lever is measured by the arm between the points 19 and I4. As the press parts reach the fully closed position of Fig. 4, piston 16b passesport 38, thus admitting pressure fluid through conduits 39, 39a and 39b to servo motors 34 and 36], causing the pistons of these motors to move upwardly, thus holding the valves 34a and 34b and 3600 and. 36b in their actuated positions. The press is thus held closed and the operator may release the manuals.
To open the press, the operator moves manual 349 in a counterclockwise direction against the effect of servo motor 34] thus permitting spring 34m to return valves 34a and 34b to their normal positions, as shown in Fig. 1, whereupon pressure fluid is evacuated from the right-hand or forward end of cylinder lfia, through conduit 35 and out the exhaust valve 342;. Spring 24 then becomes effective to rotate bellcrank IS in a clockwise direction until follower 2| has passed off the shoulder portion 23a, whereupon spring 25 becomes effective 'toopen the head and return piston lEb to the right in cylinder l6. After piston l6b has passed port 38 on its return stroke, conduit 39 is open to atmosphere through leak port "id and servo motors 34 and 3B) are then evacuated at which time valves 36a and 36b are returned to the position of Fig. 1 by their spring 36d, thus evacuating motor 29 and permitting the return of cam part 23 to the position of Fig. 1 under the influence of spring 30. The press is thus fully opened and ready for another operation.
If, as illustrated in Fig. 2, the operator actuates manual 34g only, motive fluid is supplied through conduits 32 and 33 and valve 340. to conduit 35 and piston |6b makes a stroke rearwardly or to the left as shown. The follower 2| will travel along cam portion 22 until it passes over the heel of this cam portion onto the shoulder portion 22a. This occurs when piston lBb has completed only a small portion of its stroke as will be apparent from the drawings. The piston,however,continues its stroke causing counterclockwise movement of bellcrank l8 relative to the head lever l3 until the parts reach the position of Fig. 2. It will be noted however that upon complete stroke of the piston lBb the head will not touch the bed and the operator cannot be injured. If piston |6b completes its stroke so as to open port 38, motive fluid will be supplied through conduits 39 and 39a and 39b to servo motors 34f and 36f which will maintain the valves in casing 34 in their actuated position and will actuate the valves in casing 36 to their operated position as shown in Fig. 3, 5'
that is, with valve 3611 open and valve 36b closed. This will energize motor 29 but it will be obvious that with the motor 29 of very low power as shown and described and with the parts in the position of Fig. 2, or substantially so, motor 29 is f wholly ineffective to cause any change in the position of the parts and the press will remain in partially closed position as shown in Fig. 3 until the operator moves manual 34g in a counterclockwise direction to open the press, whereupon it may be properly closed by actuation of both manuals as previously described.
What I claim is:
1. In a pressing machine, a pair of coacting relatively movable pressing members, means for relatively moving said members to close and open the press including power means and lowand highpower motion transmitting mechanisms actuated thereby, said lowand high-power mechanisms being arranged for operation during the early and later parts respectively of said relative closing movement, there being a part of said highpower mechanism normally rendering the same ineffective to produce press-closing movement, enabling means adapted when actuated to render said part eiTective, said enabling means being so constructed and arranged that it is inoperative to render said part effective after said high-power mechanism has been actuated, and. two manually operable control members spaced to require a hand of the operator on each, one for actuating said enabling means, and the other for actuating said power means in press-closing direction.
2. In a pressing machine, a pair of coacting relatively movable pressing members, means for relatively moving said members to close and open the press including power means and lowand high-power motion transmitting mechanisms actuated thereby, said lowand high-power mechanisms being arranged for operation during the early and later parts respectively of said relative closing movement, a member forming an operative part of both the lowand high-power mechanisms and normally in inoperative position rendering said mechanisms ineffective to completely close the press, enabling means adapted when actuated to move said last named member to operative position, and two spaced safety control manuals, one having an operative connection with said enabling means for actuating it, and the other having an operative connection with said power means for actuating the same in pressclosing direction.
3. In a pressing machine, a pair of coacting relatively movable pressing members, means for relatively moving said members to close and open the press including power means and lowand high-power leverage mechanisms actuated thereby, said lowand high-power mechanisms being arranged for operation during earlier and later parts respectively of said relative closing movement, a part of said high-power leverage mechanism being normally biased to inoperative position, means for moving said part to operative position, a manual for controlling said last named means, a manual for controlling said power means, and said manuals being spaced so as to require two hands of an operator for their simultaneous actuation.
4. A pressing machine as in claim 3, and including means effective automatically upon press closure for holding the press closed.
5. In a pressing machine, a pair of coacting relatively movable pressing members, means for relatively moving said members to close and open the press includingpower means and lowand high-power leverage mechanisms actuated thereby, said lowand high-power mechanisms being arranged for operation during earlier and later parts respectively of said relative closing movement, said high-power leverage mechanism having a fulcrum part, means biasing said part to inoperative position for rendering said highpower mechanism ineffective to close the press, means for moving said part to operative position, a manual for controlling said last named means, a manual for controlling said power means, and said manuals being spaced so as to require two hands of an operator for their simultaneous actuation.
6. In a pressing machine, a pair of coacting pressing members, one of which is movable toward and from the other, a lever for moving said movable member, a lever of the second order pivotally mounted on the first lever, power means operatively connected with said second named lever, a cam having a part cooperating with the fulcrum of said second named lever to hold said second lever from substantial movement relative to said first named lever during the earlier portion of press-closing movement of said power means, said cam having a movable part adapted to cooperate with said fulcrum of said second named lever during the later portion of press-closing movefor moving said movable cam part to operative position, a manual for controlling said last named means, a manual for controlling said power means, and said manuals being spaced so as to require two hands of an operator for their simultaneous operation.
7. A pressing machine as in claim 6, in which said power means is a cylinder and piston motor, fluid actuated means is provided for holding each of said manuals in operated position, and means is provided for supplying fluid to said holding means upon predetermined press-closing movement of said motor.
8. In a pressing machine, a pressing bed, a pressing head movable toward and away from said bed to close and open the press, means biasing said head toward open position, a head lever movable about an axis for moving said headto close the press, a second lever pivotally mounted on said head lever, a motor operatively connected with said second lever at a point nearer said axis than said pivotal mounting, a fulcrum for said second lever and independent of said head lever, said fulcrum having a part for holding said'secnd lever from substantial movement relative to said head lever during the first portion of press closing movement of said motor, said fulcrum having a movable part for efiective cooperation with said second lever during the latter portion of press closing movement of said motor and arranged to provide movement of said second lever relative to said head lever to apply power thereto, means biasing said movable part to ineffective position, means for moving said movable part to effective position, a control member for said last named means, a control member for said motor, and said control members being spaced so as to require two hands of an operator for their simultaneous operation.
JAMES M. DEWEY.