US514723A - Mechanical movement - Google Patents

Description

cal movement.

UNiTED TATES FRANCIS MEISEL, OF BOSTON, MASSACHUSETTS.

MECHANICAL MOVEMENT.

SPECIFICATION forming .part of Letters Patent No. 514,723, dated February 13, 1894.

Applicationriled June 10, 1 S91.

.To aZZV whom t may concern:

Be it known that I, FRANCIS MEISEL, a citizen of the United States, residing at Boston, in the county of Suolk and State of Massachusetts, have invented certain new and useful Improvements in Mechanical Movements, of which the following is a full, clear, and eX- act description, reference being had vto the accompanying drawings, making part of this specification, in which- Figure lis a side elevation of my mechani- Fig. 2 is a plan of the same. Fig. 3 is a sectional end elevation of the same on the line fr, of Fig. 1. Fig. 4 is a detail view with a part of the operating mechanism removedto show the parts behind more clearly. Figs. 5, 6, and 7 are detail views to be referred to.

My invention has for its object to produce a mechanical movement for convertinga continuous rotary motion in a single direction into an intermittent rotary motion in opposite directions with a fixed interval or pericdof rest between each change in lthe direction of motion said mechanism being adapted for voperating the inking rollers of certain descriptions ofA printing presses, and for other machinery where a movement of this characier is required; and to this end my invention consists in certain novel combinations of parts and details of construction as hereinafter set forth and pointed out in the claims.

In the said drawings, A represents a shaft having-'a continuous rotarymotion in one direction, in the present case from left to right, as indicated by the arrows.

B is the shaft to which an intermittent rotary motion in opposite directions is to be transmitted from the shaft A with a fixed interval or period of rest between each change in the direction of motion.

C is a'cam shaft carrying cams to be hereinafter described, said cam shaft being rotated A at half the speed of the shaft A with which it is connected by means of a shaft A and suitable bevel gears 25,26, 27, 28, as shown in Fig. 1.

To the shaft A is secured a crank arm a.,

, carrying the crank pin b, to which is pivoted one end of a rack bar D, the opposite end of which is enlarged and so constructed as to SerialNo. 395,806. (No model.)

forma rectangular slot or aperture c, the upper and lower edges or sides of which are provided with teeth, forming racks cl, e. Placed between and in line with these two racks upon and secured to the shaft B is a pinion E of such diameter that it will pass freely between the said racks without engaging with either. The portion of the rack-bar D containing the racks' d, e, is supported by and slides within a guide G, which is free to oscillate upon the shaft B, the journal box or block f of which fits within a rectangular slot g in the guide G, whereby said guide is permitted to move vertically with relation to the shaft B to bring either one of the racks d, e, into engagement with the pinion E. Upon one side of the guide G is a turned hub or journal h, Fig. 6, upon which is pivotally secured the upper end of a vertical connecting rod H, the lower enlarged end of which is provided with a rectangular slot t', Fig. l, within which slides a journal box or block j encircling the shaft C. Projecting from opposite sides of the lower end of the rod H as seen in Figs. l and 3, are two studs 10, 12, carrying anti friction rolls Z, m, arranged one above, and the other beneath the shaft C. These rolls are alternately operated upon by two cams K, L, secured to the shaft C, whereby the rod H is alternately raised and depressed at the proper times to bring the racks into engagement with the pinion E as will now be described. When the crank pin a is at the point 20 in its revolution,one of the racks .in the present instance the rack e, will b e thrown into gear with the pinion E as seen in Fig. 4, which is accomplished by the cam K acting upon the roll Z which raises the rod H and rack guide G and causes the rack e to engage with the pinion E holding it in this position while the crank pin b is traveling from the point 2O to the point 19, Fig. 4, or during one-half of the revolution of the shaft A. The moment the rack e has reached the limit of its throw in this direction, and during the momentary rest in changing vthe direction of throw, the rack e is withdrawn from engagement with the pinion E by the cam L acting on the roll m, which imparts a downward movement to the rod H and guide G; the shape ofl the cam being such as to draw down the guide G a sufficient dis- IOO tance only to throw the rack e out of gear with the pinion E, but not enough to canse the opposite rack d to engage with the said pinion. Both racks are now in a position to clear the pinion E, and remain so while the crank pin b is moving from the point 19 back to the point 20, thereby permitting the shaft B to remain at rest during the latter half of the revolution of the shaft A. As soon as the crank ct has reached the point 20, the cam L acting on the roll m produces a still further downward movement of the rod H and guide G, sufficient to engage the rack cl with the pinion E, and as the rack imparts motion to the shaft B only while the crank pin b is traveling from the point 20 to the pointl 9, it follows that the shaft B will be rotated in a direction the reverse of thatimparted to it by the rack e. Assoon as the rack d has arrived at the limit of its throw in this direction, it is disengaged from the pinion E by the action of the cam K on the roll Z, which raises the guide G and holds the rack (l just out of contact with the pinion during the remaining half revolution of the shaft A, immediately after which the cam K still further raises the guide G and again engages the rack e with the pinion, when the operation continues as before, the pinion E being thus operated upon alternately by the racks cl, e, with an interval or period of rest between each engagement equal to that occupied by a half revolution of the shaft A, and consequently the shaft B is first rotated in one direction during a half revolution of the shaft A from the point 2O to the point 19, then allowed to remain at rest during the completion of the revolution of the said shaft A, then rotated in the opposite direction during the first half of the next revolution of the shaft A from the point 2O to the point 19, and again allowed to remain at rest during the completion of this revolution of the shaft A, the operation being then continued as before.

It is obvious that when the racks CZ, e, are both disengaged from the pinion E, a locking device must be employed, otherwise the shaft Bwould be free to turn in either direction by its own momentum, and thus throw the teeth of the pinion out of alignment with theracks, so that they would not properly engage therewith when operated by the cams K L. To prevent this, I provide a locking device consisting of a wheel M having a notch p, (or in case the shaft B is arranged to make more or less than a full revolution, two notches,) with which engages a locking dog q, which is supported by and slides in a suitable guide r and is operated by a lever s connected therewith, and pivoted at t to a suitable support, said lever s being actuated by a rod N forked at its lower end to embrace the shaft C, and carrying an anti-friction roll n working in a cam groove o in the face of the cam wheel P, as seen in Figs. 3 and 7, the cam being so shaped and timed as to cause the locking dog q to enter the notch p of the wheel M the instant before the rack c or d has become disengaged from the pinion E, whereby the shaft B is securely locked and prevented from be ing rotated in the slightest degree by its own momentum after its pinion E has ceased to be acted upon by either of the racks. locking dog remains in the notch ot' the wheel M until the moment that the opposite rack has become engaged with the pinion, when it is withdrawn by the action of the cam wheel P and the operation continues as before, the holding of the shaft B in the exact position in which it is leftby either of the racks e or CZ being thus rendered certain, whereby all liabilityof the mechanism becoming deranged is obviated, and its positive action insured.

That I claim as my invention, and desire to secure by Letters Patent, is-

The

1. In a mechanical movement, the combination, with a shaft provided with a pinion or gear, of a rack-bar having a rectangular aperture or slot provided with upper and lower racks, said pinion being placed within said aperture,a supporting guide for the rack-bar, a crank on the shaft from which the motion is to be transmitted to the pinion-carrying shaft, said crank being connected with said rackbar, a guide-rod connected with the rack-guide and cams for operating the same, whereby the pinion is alternately engaged with the racks and is operated thereby only while the rackbar is traveling in one direction, said racks being held out of engagement with the pinion when the rack-bar is traveling in the opposite direction, substantially as described.

2. In a mechanical movement, the combination of the shaft A having a crank a, and crank pin b, the rack bar D provided with the racks d, e, the shaft B, carrying the pinion E, the guide G supporting the rack barD and provided with a rod H, the shaft C rotating at a rate of speed different from that of "the shaft A, the cams K, L, adapted to raise and lower the rod H and guide G to throw the racks alternately into and out of engagement with the pinion E, said pinion being rotated by said racks when the rack bar is traveling in one direction only during a half revolution. `of the shaft A, and said racks being both held out of engagement with the pinion during the remaining half revolution of the shaft A,substantially as and for the purpose set forth.

3. In a mechanical movement, the combination, with the shaft B and its pinion E and the rack bar D connected with the crank a on the shaft A, of the guide G adapted to support the rack bar and having a slot for the shaft B, the rod H depending from the guide G and provided at its lower end with a slot and anti-friction rolls Z, m, and the shaft C passing through the slot of the rod 1I and the cams K, L, adapted to act upon the rolls Lm, to alternately raise and lower the guide Gand racks d, e, and hold the same in a central position both out of engagement with the pinion during one-half of the revolution of the shaft A, whereby the shaft B is alternately rotated IOO lIO

514,723 v eA in opposite directions and allowed to remain at rest during one half of each revolution of the shaft A, substantially as set forth.

- 4. In a mechanical movement, the combination, withvthe shaft B and its pinion E, the rack-bar with its racks, the guide G, the rod H, and the cams for operating said rod as described, of a locking or holding device adapt ed to lock or hold the shaftl B the instant it ceases to receive motion from the rack-bar, substantially as set forth. v

5. In a mechanical movement, the combination, with the shaft B and its pinion E,the rackbar with its racks, the guide G, the rod H, and the cams K, L, for operating said rod as described, of a locking device consisting of a notched wheel and a dog or catch adapted to engage therewith, and means substantially as described for operating said dog to lock the shaft B the, instant it ceases to receive motion from the rack-bar, substantially as set forth.

6. In a mechanical movement, the combination, with the shaft B, pinion E, and rack bar D operated as described, of the notched wheel M, the dog q, lever s, rod N forked to embrace the shaft C and carrying the anti-friction roll fn., and the cam Pon the shaft C, all operating substantially in the manner and for the purpose described.

3 Witness my hand this 5th day of June, A.

D. 1891. FRANCIS MEISEL.

. In presence of P. E. TESCHEMACHER, J. S. F. HUDDLESTON.

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