US2785658A - Control and actuating means for motor reversing valves - Google Patents

Description

Marc 19, 1957 M. E. PAPANOLI ETA]. ,65

CONTROL AND ACTUATING MEANS FOR MOTOR REVERSI NG VALVES Filed June 8, 1955 3 Sheets-Sheet l r fi I/llllll c 4 n 1 26 l 2 49 25 5' a 35 o 38 a Inuenfors MmhaflEPapcmMi damaswcsm Lee 4%; B

March 19, 1957 PAPANCL' 2,785,658

CONTROL AND ACTUATING MEANS FOR MOTOR REVERSING VALVES 3 Sheets-Sheet? Filed June 8, 1953 6 m TQL W 80 .T m M MEWM m ..MJ

United States Patent CDNTROL AND ACTUATTNG MEANS FOR MOTOR REVERSING VALVES Michael E. Papanoli, Spring Lake, and James Wesley Lee,

Grand Haven, Mich, assignors to The Lhaiienge Machinery Company, Grand Haven, Mich., a corporation of Michigan Application June 8, 1953, Serial No. 360,192

4 Claims. (Cl. 121-33) This invention relates to the control for hydraulic paper cutters which are used in printing shops to cut stacks of paper to the desired size. Paper cutters of this nature have a table on which the stack of paper is laid and above it a horizontal knife bar on which is mounted a knife having a sharp lower edge. The knife bar is mounted for a swinging downward and upward movement and, for the purpose of this invention, it is operated hydraulically by means of a hydraulic pressure mechanism connected to the respective ends of a cylinder having a piston and a piston rod which is connected to the knife bar. The hydraulic mechanism includes a valve which has a neutral position and may be moved either way from the neutral position to direct the hydraulic fluid to either the top or bottom of the cylinder to cause movement of the knife bar either downward for the cutting movement or upward for the return movement.

This invention deals with the means for operating the hydraulic valve which is manually operable but includes means for automatically returning the valve to neutral position when the return movement of the knife bar has been completed. The invention also incorporates a safety device which makes necessary the use of both hands of the operator remote from the knife to start the knife in its downward movement.

The invention is hereafter more fully described, reference being had to the accompanying drawings in which,

Fig. l is a front elevation of a paper cutter embodying the invention,

Fig. 2 is a sectional plan view of the same,

Fig. 3 is a plan view of the valve control mechanism with some of the upper parts removed,

Fig. 4 is a plan view of the valve control mechanism with only the cover removed,

Fig. 5 is a plan view similar to Fig. 4 with the parts moved to knife-lowering position,

Fig. 6 is a sectional elevation on the line 66 of Fig. 4,

Fig. 7 is a sectional elevation on the line 7-7 of Fig. 4, and

Fig. 8 is a fragmentary end elevation of the paper cutter.

Like reference numerals apply to like parts in all of the figures.

The paper cutter has vertical side frame members 1, a top cross member 2, and web 3. There is a table 4 extending between the side members 1, and the knife bar 5 carrying the knife 6 is located above the table and guided at its ends in the side members 1. The knife bar is hung on links 7 pivoted at their respective ends to the top member 2 and the knife bar which causes the knife to follow a swinging path in its up and down movements.

A hydraulic cylinder 8 is mounted on the top member 2 and has a piston rod 9 connected to a paper clamp 14), this being no part of the present invention.

A hydraulic cylinder 11 is pivotally anchored at 12 to a side frame member 1, and its piston rod 13 is connected to one end of. the knife bar 5 outside the frame.

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Hydraulic pressure mechanism including a pump, not shown, driven by a motor 14 and having a control valve located in a valve housing 15 which has two outlets 16 and 17 which are connected by flexible conduits 18 and 19 to the top and bottom respectively of the cylinder 11. The valve in the housing 15 is of the sliding balanced type and has a valve stem 20 extending outside of the housing 15.

The aforedescribed parts are conventional and well known in the art and form no part of the present invention per se excepting as they cooperate therewith to produce the desired result.

The control mechanism of this invention comprises a body fixed to the web 3 of the frame by a flange 26 through which is an opening 27 in alignment with the valve stem 29. An operating bar 28 is mounted in the body 25 to slide in and out, also in alignment with the valve stem 2% and a connecting rod 29 connects the valve stem 26 with the operating bar 28 so that they move in unison. This valve is of the nature of the valve l220 shown in the patent to W. Ernst, No. 1,927,583.

A hand lever 39, located in convenient reach at the left hand side of the table 4, is pivoted at 31 to a bracket 32 and" is connected by a link 33 to a lever 34 which is fastened to the upper end of a vertical shaft 35 which is journaled in brackets 36 and 37, and a lever 38 is fastened to the shaft 35 near its lower end and has its swinging end slotted at 3 to receive a pin 4t) on the outer end of the operating bar 28. By this construction, manipulation of the lever 3t causes inward and outward movement of the operating bar 28, and like movement of the hydraulic control valve in the housing 15. No other mechanism would be required if the hydraulic valve were to have full manual control without the safety feature.

A safety latch 45, best shown in Fig. 3, is mounted to slide in the body 25 laterally of the operating bar 28 which is shouldered at 46, its inward portion being narrower than its outer portion, and a spring 47 normally thrusts the latch toward the operating bar so that its inner end will be engaged by the shoulder 46 when the parts are in neutral position, as shown in Figs. 3 and 4. In this position the latch 45 prevents inward movement of the operating bar which would move the hydraulic valve to a position to direct the hydraulic fluid to move the knife bar downward.

A release wire 48 is connected to the latch 45 and extends through a flexible casing 49 to a position near the right hand side of the table 4 where it is provided with a pull button 56. Thus by pulling with the right hand on the button 50, the safety latch 45 is retracted away from the shoulder 46 so that the left hand may manipulate the lever 30 to move the operating bar 23 and hydraulic valve inwardly to knife-lowering position as shown in Fig. 5, and with both hands of the operator being necessarily occupied remote from the knife they cannot be cut during the lowering movement.

From neutral position of Fig. 4 the operating bar 28 may be moved either inwardly or outwardly, but since the knife bar is always raised in rest position, outward movement of the bar would accomplish nothing and therefore the above-described inward movement is the only effective movement that can first be made.

During said inward movement of the operating bar 28 a cam slide 51, located above the safety latch 45, is moved to the right against tension of its operating spring 52. This is accomplished by a bell crank lever pivoted at 53 to the under side of the cover plate 54. The bell crank has an arm 55 which straddles a pin 56 on the operating bar 28 and another arm 57 which engages a pin 58 on the cam slide 51. When moved to its retracted position of '3 Fig. 5, the cam slide is held retracted by the catch 59, which is thrust into a notch 619 in the slide by a spring 61.

The operating bar 28 is provided with a depressable cam pin-62 projecting upwardly .the'path tot-the ca face :63 on the cam slide 51, and is yieldably held extended ,by a spring 6 1%. When the cam slide 51 is held retracted .as'in Fig.5, the cam face 63 is out of thepath of the cam pin 62 so that by manipulation of the lever 33) the operating bar may be moved outward toits fullest extent as shown in dotted lines in Fig.5. This outward movement of the operating bar moves the hydraulic control valve, in the housing 15 totposition to direct the fluid to thebottom of the cylinder 11, causing the knife bar '5 torise. it also moves the cam pin 62 into the path of the cam face 63 and the bell crank arm 57 away from the pin 58 on ,the cam slide.

When'the knife bar moves upward to the top of itsreturn stroke the catch 59 is pulled out'of the ,notch 60, releasing the ca n slide 5f. which is then moved to the left by its spring 52, and in this movement the cam face 63 :cams the pin 62 and moves the operating bar 23 and the hydraulic valve to neutral position of Fig. 4. For this purpose a pull Wire 65 is attached to the catch 59 and extends through a flexible casing 66 to the outside of a frame member '1 where the wire is I slide 51 at the top of the return stroke of the knife bar. h

The cam slide 51 has a notch 68 adjacent the high side of the cam face 63 and in alignment with the cam pin 62 when the cam slide is in neutral position, Fig. 4. This notch permits the operating bar 23 to be moved outward from neutral position to raise the knife bar in case it should inadvertently have beeen moved to midposition, and owing to the fact that the operating bar may have been moved outward with the pin 62 in said notch 68 before normal operation of the mechanism, the underside of the cam 63 is inclined at 69, Fig. 6, so that it will push the cam pin 62 down as the cam slide 51 is moved by the lever 57 and the cam will ride over the cam pin which is released. after the cam has passed over it.

' Operation It is to be understood that the hydraulicpressure control valve in the housing is a balanced valve which will remain wherever set and will only move by action of the central mechanism.

Assuming the parts to be in neutral position of Fig. 4, with the knife bar 5 at the top of its stroke and the pressure control valve in neutral position, the operator pulls the button 5%) with one hand, which retracts the safety latch 45 from the shoulder 46 and then with the other hand he manipulates the hand lever to move the operating bar 28 inwardly to the position of Fig. 5. This movement moves the pressure control valve to position to direct the pressure fluid to the top of thecylinder 11 and moves. the knife bar 5 downward in its cutting stroke. The button 5% is released which permits the spring 47 to thrust the safety latch against the side of the operating bar 28 outwardly from the shoulder 46.

The above movement also causes the bell crank 55.57 to move the cam slide 51 to the right where the catch 59 snaps into the notch and holds the cam slide in cocked position under tension of its spring 52. I

Now, the cutting stroke having been completed, the operator shifts the lever 30 to move the operating bar 28 outwardly to the dotted line position of Fig. 5, which shifts the pressure control valve to direct the pressure fluid to the lower end of the cylinderll and raises the knife bar. This movement also swings the bellcrank sition to either element working or return positions, a

arm 57 away from the pin 58 on the cam slide and moves the pin 62 into the path of the cam face 63.

As the knife bar 5 reaches the top of its return stroke it engages the lever 67 to which the pull wire 65 is attached and raises it sufficiently to pull the catch 59 out of the notch 60 in the cam slide 51, whereupon the spring 52 thrusts the cam slide to the left causing its cam face 63 to engage the cam pin 62 and push'the parts, including the pressure control valve, back to neutral'position.

By this structure the operator need only to use his hands to shift the lever 36 to start each movement, and after he has started the upward movement ofthe knife bar no further attention is required as the cam slide will return all parts to neutralposition at the .end ofethe return stroke.

The invention is defined in the appended claims and is to be considered comprehensive of all forms coming within theirscope.

We claim: 1

1. The combination .with :a machine having a movable element :and pressure means for moving the element in working and return directions, including a source of pres sure for said pressure means and a valve to control said pressure, of means for actuating said valve comprising, a body, an operating member slidably mounted on said body-and connected to said valve, manual means for mov ing said operating member and valve from a neutral poslide having a cam face slidably mounted On said body, means on said operatim member engageable with said cam face, a spring acting to move said slide 'in a direction to engage said cam face with said engaging means on the operating member, means acting to move said slide against action of said spring upon movement 'of the operating member to element working position, a latchengageable with said slide and acting to hold it with the spring'compressed, and automatic means acting to release'said latch at the end of the return stroke of the element, whereby the spring will move the slide to cam the operating member into neutral position.

2. The elements of claim 1 combined with separate manually releasable means for preventing movement of the operating member and valve to element working positions.

3. The elements of claim 1 in which said valve is a balanced valve and will remain in any position in which it is set until moved by either said manual or automatic means.

4. The combination with a machine having a movable element and pressure means for moving the element in working and return directions, including a source of pressure for said pressure means and a valve to control said pressure, of means for actuating said valve comprising, a body, an operating member connected to said valve and movably mounted on said body, manual means for moving said operating member and valve from a neutral position to either element working or return positions; said manual means being free to move said valve in all movement of the element to the end of its return stroke,

whereby said spring will;move said cam into engagement with said operating member and move said valve :to neutral position.

- [Ref rences-9n follow ng P ge) References Cited in the file of this patent UNITED STATES PATENTS Hornet Apr. 4, 1883 Rohan Aug. 16, 1910 5 Perkins Jan. 27, 1914 6 Caps June 8, 1926 Ernst Sept. 19, 1933 Muir June 17, 1941 Stacy Jan. 16, 1945 McLaughlin June 26, 1945 Adrian Aug. 18, 1953

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