US1408439A - Mechanical movement - Google Patents

Description

I. C. BUCKMINSTER.

MECHANICAL MOVEMENT.

APPLICATION FILED-MAR. 31. 1919.

1,408,439. Patented Mar. 7, 1922.

UNITED STATES PA'IJENIT OFFICE.

ma 0. BucxmmsrEn, 0F BEVERLY, MAssAomrsET'rs, ASSIGNOR TO UmrEn sue-1; MACHINERY CORPORATION, or PATERSON, NEW JERsEY, A coEroEA'rIoN or mnw JERSEY.

MECHANICAL MOVEMENT.

To ll whom it may concern: I

Be it known that I, IRA C. BUCKMINSTER, a citizen of the United States, residing at Beverly, in the county of Essex and btate of Massachusetts, have invented certain Improvements in Mechanical Movements, of

member rotating about the crank pin as an axis, and means to cause a point on said member to move to and fro in a straight line, with means for causing the direction of the to-and-fro movement to be varied. When .a pitman, or other operated or operating device arranged for movement in a predetermined direction, is connected to the point which moves to and fro, variation in the direction of said to-and-fro movement is effective to cause greater or less components of said movement to be transmitted to the pitman or other operated or operating member to impart greater or less movement thereto.

Ordinary eccentric or crank motions impart a predetermined amount of reciprocation to the driven device or member. Many machines are such that it is desirable to increase or diminish the point to which a certaintool or'operating device shall move. For instance, in a type of heel breasting machines it is desirable to vary the stroke of the knife in accordance with the thickness of the sole.

There are other types of machines which,

for example, operate upon the sole portions of boots and shoes where a greater amount of operation is required at the shank than at points beyond or at the rear of the shank.

The present invention provides improved mechanism whereby an operating tool, such as a knife, can be given one throw to a given point and then another throw to a farther point, or, by way of further illustration, if the operating tool be a roll operating upon a shoe bottom, said roll can be operated first over a given surface-as the shank portion of the shoe bottom and then be rolled I Specification of Letters Patent. Patented Ma 7 1922 Application filed March 31, 1919. Serial No. 286,511

over greater or less areas so that theshank Fig. 1 represents a section through the different members of my improved mechanical movement. i

Fig. 2 1s a'vtew' looking from the right of g g. t, partly 1n section on the line 22 of Fig. is a view similar to a portion of Fig. 2 but illustrating a diiferent form of adusting rack.

Fig. 4 is a diagram illustrating the operation.

A suitably mounted driving shaft 12 is piovided with a crank 13 and crank pin 14.

ounted upon the crank pin is an eccentric 15 which, however, might obviously be a crank. Compounded with the eccentric 15 or integral therewith is a pinion 16. In the particular embodiment of the invention illustrated, the pinion and eccentric are rig- 1dly secured together, as by means .of one or more locking pins 17. For better purposes of illustration of the operation, the i398 gf the crank pin is indicated at 18in having a pitman 20 which, it is to be understood, is to reciprocally transmit motion to any tool or piece of mechanismthe throw of which is to be varied. Preferably bearing rollers. 21 are provided between the eccentric 15 and crank pin 14, and bearing" rollers 22 are provided between the eccentric 15 and the sleeve 19.

Mounted in suitable bearings is a shaft 23 in alinement with the shaft 12, said shaft 23' carrying a hub 24 having arms 25 the outer ends ofwhich carry a ring 26 having internal teeth 27 and external teeth 28. The internal teeth 27 are twice the number of the teeth of pinion 16. In other words, the diameter of the pinion 16 equals the radius of the inner circle of the ring 26.

The ring 26 is rotatably adjusted by any suitable means. One way might be by partially rotating the shaft 23 which carries said ring, but in Fig. 2 'I have indicated a worm 29 meshing with the external teeth 28 of the ring 26, said worm being mounted in 3 the eccentric,

whereby the worm may be rotated as by a suitable handle 31. The worm is not freely rotatable, that is, it can not be rotated by any action transmitted to it by a tendency of the ring 26 to rotate. The worm is intended simply to shift andvhold the ring 26 in any position of rotation relatively to the] axis of the shaft 23 that may be desired. p V

In Fig. 3 the means for rotatably adjustin the ring 26 comprises a rack 32 mounted Y to' e adjusted endwise in supporting guides 33. By means of a pin 34 projecting from. the rack and a link 35 which may be connected to any pattern or control mechanism such as the cam of the machine in which the mechanical movement is employed, the rack crank pin 14 rotates in one direction the pin ion 16, and the eccentric 15 are carried around by the crank pm, but sal pinion and eccentric rotate in the opposite direction on the axis 18 and for each complete rotation of the crank pin, the pinion is rotated once and carries the eccentric with it and consequently "reciprocates the pitman 20. I

The operation is as follows Assuming that the adjustment of the ring 26 is such-that the parts occupy the relative positions shown in Figs. 1 and 2, and that rotation of crank 13 starts clockwise in Fig. 2, then the engagement of the pinion 16 with the inner teeth 27 of ring 26 causes said.pinion and the eccentric 15 which is fixed thereto to rotate anti-clockwise about the translatin axis 18, but the center a: of

i ollows the path indicated by line a: 3/ in Fig. 4, giving a maximum throw to the pitman. Supposing the mechanism is stationary, any adjustment of the ring 26 in either direction from the Fig. 2 position causes the' pinion and eccentric toturn on the crank pin 14: and draw the-center w toward the axial line of power shaft 12, thus reducing the extent of throw of the pitman,

when the mechanism is started. This reference to adjusting while the mechanism'is not vin operation is toaid an understanding -man is always vertical in said figure.

tal circle. In the particular embodiment of the invention exemplified in the drawin the eccentric ,15 is rigidly carried by t e I circle so that a point thereof (e., g. the center w of the eccentric) describes av hypoc cloid in practically a straight line since t e diameter of the generatin circle (16) equals the radius 7 of the fun amental cir- In practice the parts are so mounted or arranged that the direction of thrust and pull of the, pitman 20 is determined. Therefore, if the hypocycloid be in line with that direction of thrust, the throw will be maxi-' mum and if'inclined relatively thereto the throw will be reduced in proportion to the degree of inclination.

For purposes of description, assume that the center of the-eccentric 15 is the point of the generating circle indicated at a: or w or w" in the diagram Fig. 4; that in said figure, 27 denotes the fundamental circle;' that the three dot and dash circles a, b, 0 represent different positions which the ncrating circle may occupy at the start. 0 an operation, said different positions being controlled by rotatively adjusting the ring 26; and that the direction of motion of the itow if,.at the start, the center of eccentric '15 is at w, it will, during each complete rotation of shaft 12, travel across the diameter of 27 to 3 and back again, thereby im art-ing maximum throw to the pitman an 'whatever machine element is operated thereb illustrated by the line 1. If the ring be a 5 justed so that, at the start, the center of the eccentric is at at, each complete rotation of the shaft will cause that point to travel across to 3 and return, thereby imparting a lesser throw indicated by the'line 2. If the 1 ring be adjusted so that, at the start, the center of the eccentric is at-m, each complete rotation of the shaft will cause that point to travel across to y" and retulfn, thereby substantially stopping reciprocatihg 115 motion of the pitman without disconnecting driving power from shaft 12.

Any desired throw of the pitman between maximum and minimum can be obtained by so adjustin the ring 26 that, at the start, 120 the center 0% the eccentric occupies any intermediate oint between a: and m, and this can be e ected while the machine is in operation,

By the term ring employed herein and 125 in the claims, I do not mean to limit myself to the illustrated shape of the member 26 further than that its internal toothed portion is circular. Of course when a worm 29 or rack 32 is employed to adjust the mem- 13 ber 26, the latter has a curved toothed outer portion to co-operate with the worm or rack. If other means for rotatively adjusting the member 26 should be employed, the outer configuration of said member 26 would possess no significance. For instance, if the pin 34: in Fig. 3 should be carried by the member 26, then the link 35 could be employed to actuate said member rotatively and the latter could have any external shape that might preferably be given thereto.

' Inasmuch as the mechanical element known as an eccentric is but a form of crank, I desire to be understood as not limiting myself to a structure in which the diameter of the member 15 is larger than its throw. If of less diameter it would be properly termed a crank.

Having described my claim 1. A mechanism for converting rotary into reciprocatory motion, comprising an internally toothed ring, means for rotatively adjusting said ring, a pinion, means for invention, I

traversing the pinion in a circular path with its teeth in engagement with the teeth of said ring, and an actuator carried by said pinion.

2. A mechanism for converting rotary into'reciproeatory motion, comprising an internally toothed ring, means for rotatively adjusting said ring, a pinion the diameter ment with the teeth of said of which is one-half the internal diameter of the ring, means for traversing the pinion in a circular path with its teeth in engagering, and an actuator carried by said pinion.

3. A mechanism for converting rotary into reciprocatory motion, comprising an internally toothed ring, means for rotatively adjusting said ring, a pinion having onehalf as many teeth as said ring, means for traversing the pinion in a circular path with its teeth in engagement with the teeth of said ring, and an actuator carried by said pinion.

4. A mechanism for converting rotary into reciprocatory motion comprising a shaft having a crank pin, a inion mounted on the cran pin, an interna 1y toothed ring having its teeth engaging said pinion, said ring being rotatively ad ustabIe on an axis in alinement with said shaft, and an actuator for a reciprocatory element, said actuator being rigidly carried by said pinion.

5. A mechanism for converting rotary into reciprocatory motion comprising a shaft having a crank pin, a pinion mounted on the crank pin, a ring having internal teeth en aging said pinion, said ring being rotative adjustable on an axis in alinement with said shaft, an eccentric carried by said pinion, and a reciprocatory member to be actuated by said eccentric.

6. A mechanism for converting rotory into reciprocatory motion comprising a shaft carrying an eccentrically mounted pinion, an eccentric connected to said pinion to be rotated about the axis of said pinion, a reciprocatory member adapted to be actuated by said eccentric, and a rotatively adjustable ring gagement wlth the teeth of the inion.

7. A mechanism for convertlng rotary into reciprocatory motion comprising a, shaft having a crank pin, a pinion mounted on said crank pin, an eccentric carried by the pinion, a ring having internal teeth in engagement with the pinion, said ring being mounted to be adjusted on an axis in alinement with the axis of the shaft, and means for adjusting said ring and holding it in adjusted position.

8. A mechanism for transmitting rotary into reciprocating motion or the reverse, comprising a crank, a crank pin, a member rotating about the crank pin as an axis, means to cause a point on said member to move to and fro in a straight line, and means for changing the direction of said to and fro movement.

9. A mechanism for transmitting rotary into reciprocating motion or the reverse, comprising a crank, a crank pin, a member rotating about the crank pin as an axis, means to cause a oint on said member to move to and fro in a straight line, means for changing the direction of said to and fro movement, and means for utilizing a component of said movement in a predetermined direction.

, 10. A mechanism for transmitting rotary into reciprocating motion or the reverse, comprising a crank, a crank pin, a member rotating about the crank pin as an axis, means to. cause a point on said member to move to and fro in a straight line, a pitman connected to said member at said point, and means to cause greater or less components of said straight line movement to be effective to reciprocate the pitman in a given direction.

11. A mechanism for transmitting rotary into reciprocating motion or the reverse, comprising a crank, a crank pin, a member having internal teeth in enrotating about the crank pin as an axis, 4

means for causing two rotations of said member for each rotation of the crank to cause a point on said member to move to and fro in a straight line, a itin an connected to said-member at sai point, and

means to cause greater or less components of IRA C. BUCKMINSTER.

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