US2182018A - Two-hand control - Google Patents

Description

Dec. 5, 1939. w. c. ElcKMAN TWO-HAND CONTROL 3 Sheets-Sheet l Filed April 2, 1937 VIH INVENTOR. VVA/ 7152 B5/(MAN ATTORNEY5 Dec. 5, 1939.

W. C. EICKMAN TWO-,HAND CONTROL Filed April 2, 1937 s sheets-sheet 2 I- l INVNTOR. WAL TEA 7. 7a/(MAN M #umg/M ATToRNEYs Dec. 5, 1939. w- Q EICKMAN v l2,182,018

TWO -HAND CONTROL Filed April 2, 193'? v 3 Sheets-Sheet 3 1 INVENTOR.

WAL new 7. Ac/(MHH .QW @i M ATTORNEYS Patented Dec. 5, 1939 18ans Harris- Seybold-Potter C'ompany, Cleveland,l

Ohio, a corporation of Delaware Application April 2, 1937, Serial No. 134,640

7 Claims.

'I'his invention relates to improvements in two-hand control, that is to say a safety control requiring the use of both hands of the operator, so that it is impossible for him to have either hand a dangerous position during the working stroke ofthe knife or other tool. As illustrated herein the invention is applied to a paper cut# ting machine, but it will be apparent that in its broader aspects it is applicable to other types of machines in which the tool reciprocates in a vertical or some other direction.

One of the objects of the invention is the provision of a` two-hand control of the character stated whereinthe electrical operation of the clutch is direct and, therefore, instantaneous, as distinguished from one in which 'the electrical control merely sets in motion mechanism for throwing the clutch, with the action necessarily delayed on that account, or onein which electrical control must be operated in conjunction with a manual operation, such as throwing a lever. l

Another object rof-,the invention is the provision of means for making possible the jogging of the knife or other tool on the up or return stroke as well as upon the down or work stroke, this provision being highly advantageous in making the necessary adjustments and settings of the machine preparatory to performing a given job.-

Still another object is the provision of means of a novel character for insuringa stoppage of the tool at the end of each return stroke, so that if theoperator inadvertently holds his hands on the controls throughout the-return stroke, the tool will not start on another work stroke, but on the contrary the operator must intentionally actuate the control buttons before a work stroke can be initiated. This is a safety'measure for the protection of the operators helper whose duty it is to adjust the work for the neXt cut.

Other objects and features of novelty will appear as I proceed with the description of that embodiment of the invention which, for the purposes of the present application, I have illustrated inthe accompanying drawings, in which Fig. lis a front elevational view of a fragment of a paperr cutting machine embodying the invention. f

Fig. 2 is a side view of the same, and

Fig, 3 is a wiring diagram, showing the twohand control system; which' I employ.

In the drawings, I0 represents the frame of a paper cutting machine having a Work table II, a back gauge I2, a paper clamp I3, a knife blade I4 and a knifel bar I5. Power to operate the machine may be applied by a belt I6 running over a pulley II'I fixed on a shaft I8, which also carries ahy-wheel I9.

The shaft I8 extends only part-way across the .5

fmachine, where it is aligned with another vshaft 20. Shaft lcarries one element 2| of a friction clutch, while shaft 20 carries another element 2,2 of the clutch. These two clutch elements may be,frictionally engaged by means of v'a wedge pin or finger 23 carried bya collar 24 that is slidably keyed to shaft 23 and is movable longitudinally thereupon by means of a yoke `25. When the wedge pin 23 is in the position shown in Fig. 1 the clutch elements areengaged. 'Ihey may be disengaged by movement of wedge pin 23 to the left in that figure.

On the opposite end of shaft20 there is secured a small gear 26fwhich meshes with a larger gear 2l' keyed to a shaft 28. The latter shaft also carries a relatively small gear 29 which in turn meshes with a large gear 3B on the crank shaft 3| ofthe machine. The latter shaft carries at its endsl cranks from which the knife bar is operated through the intermediacy of the usual connecting rods. These parts are all well known, in the art. The speedfreducing train of gears connecting shafts 20 and 3| does not appear in Fig. 1, being'located on the side of the machine- Which is cut away in that figure, but is well illustrated in Fig. 2. l A

The clutch shifting yoke 25 is pinned to an operating shaft or rod 32 on which there is an adjustable collar 33 that forms an abutment for one Vend of a spiral spring 34, the other end of which bears against a bracket 35 on the frame and through which the shaft 32 is adapted to slide. The shaft 32 also carries at one end thereof a pair of spaced collars 35 between which is positioned the ball end of a crank 3? mounted upon a shaft 38 lwhich extends along the side ofv the machine and is suitably mounted for oscillating motion. At an intermediate point this shaft has keyed thereto an arm 33 in the outer end of which is oscillatably mounted a short shaft 40, through which extends a pin 4I that may be threaded into the shaft or otherwise fixed therein. At its lower end the pin 4! terminates in a flattened extremity 42` which is interposed between a pair of'ang'es on the upper end of an armature 43, which isadapted to move vertically in a solenoid 44. When the solenoid 44 is energized the armature 43 and the pin 4| are pulled down to the positions shown in Fig. 1, thereby swinging arm 39 and crank 3l in the anti-clockmuch as it forms no part of the present inventionk no further description of the same will be given;

At the forward extremity of shaft 38 I'may also provide a hand lever 45 for manually oscillating.

shaft 38 to set the knife bar-in motion, but it is to be understood that this also will not be utilized when the electrical control is functioning.

Twopush buttons 41 and 48 are mounted at convenient positions on the machine, )preferablyl under the forward end of table Il. These buttons constitute the manually operated part of the two-hand control. They must ofcourse be separated sufficiently so that both hands of the Operator will be required 'to'make the` control function, in all cases. The electrical systern'for the control of the machine includes two limit switches which are each opened and closed once for every complete stroke of the tool. Inthe present instance these switches are illustrated at 49 and 458. Their operating levers terminate in rolls l and 52 respectively which run upon semicircular cams or tracks 53 and 54. When the rollers 5i and 52 are raised by the cams the switches 49 andy 59 are opened,y and when they are lowered by the cams the switches are closed.

Referring now to Fig. 3, which is a diagram of the wiring system, L and L2 represent line wires.

S is a snap switch by means of which the system` may be connected with or disconnected from the line wires. A pair of conductors 55 and 56, connected withthe solenoid 44 are adapted to'be brought into circuit with line wires L and L? by a double switch 51, which has a bias toward open position and is arranged to be closed by the energization of an electromagnet 58. From line Vwire L' there extends a conductor 59, `while vline wire L2 is connected with the system through two conductors 68 and 6I, the electromagnet 58 being" and 55 are electrically joined by a conductorV 66 which is in communication throughv a flexible conductor 61 with a conductor 68 leading to con-- ductor 59. The electromagnet 63 is arranged in series with conductor 69 and a conductor 69 which extends to one of the contacts of limit switch 49.

The two push buttons 41 and 48 are doubleacting, that is to say when released by the operator push button 41 bridges two contacts `10` and 1|, and push button 48 bridges two contacts 12 and 13. When they are depressed by the operator these buttons bridge two pairs of contacts 14, 15 and 16, 11. A conductor 18 connects contact with conductor 59, a conductor 419` connects contacts 1I and 12, and a conductorY 80 connects contact 13 with one-of the contacts of limit switch 49. Contacts and 16 are connected by a conductor 8|.

The switch arm 64 of relay 62, when in operative position, engages a contact 82V which'- is connected by means of a conductor 83 with contact 13 of push button 48. The other contact 84 of the relay, which cooperates with switch arm 65 is connected by means of conductor 85 withv .tion as illustrated in Fig. 3, a conductor 89, limit switch 50,. and a conductor 99, the latter connectving'with'conductor 6l. When switch 88 is in the dot and dashv position of Fig. 3 conductor 81v is connected through a conductor r9| with contact 11 of push button 48.

The snap switch S and the two-way switch 88 vmay Abe mounted upon the machine in any convenient'v position, as may the relay 62 with its switches and the electromagnet 5 8 with its switches. i

'Operation-When the operator desires 'to use the electrical two-hand control,v he'v turns the snap switch S` to operative position. `The knife isat rest at the top ofits' stroke.v In' Fig'.- 2` the crank shaft is illustrated in a position? justprior to the stopping position. At thestop position the cam track 53has run out from underthe roller 5l, andswitch 49 is closed. vThis sets up a circuit from line -wire Lthrough switch S, conductors 59 and'18, to contact 18 of push button 41, through-the push button land out from contact 1l through conductor 19to contact 12 of push button 48, through that push button and out throughk contact 1.3 to conductor 488, thence through closed switch 49andconductor 69 to relay vcoil 68and out throughconductor 60 to line wire-L2. Coil63 being thus energized-,the two switches 64and`65 are closed. This sets up a holdingxor sealing :circuit for thevrelay from conductor 59 through conductors 68,561, 66 and switch 64 to contact 82, thence through conductors 83 and 80 to limit switch 49, andi-from that switch through conductor 69 to lcoil 63, and by way of .conductor 68 yto linenwire L2.

`.'I'hisjsealing circuit. remains closed so-long as ltact 16, and by way of conductor` 8| to contact 15 of push button'41, across to contact 14 and cut through conductors 86 and l6I to electromagnet 58 and line wire L2. The energization of electromagnet 58 closes the double switch 51 and sets up a circuit from line wire L through one arm of the switch and through conducto-r 55 to solenoid 44 and back through conductor 56 and switch 51 to line wire L2.

Irmrnediately after the solenoid 44 is energized the clutch fis engaged and the knife. starts to descend. f `Its descent is controlled by the operator, who may stop it at yany point by releasing pressed 'until the cut is completed. At the' bot- 'asy tom of the stroke the. limit switch 49 opens and the limit switch 50 closes. The opening of switch 49 deenergizes coil 63. Hence the sealing circuit is broken both at the switch 49 and at the Switch 64. Simultaneously the circuit through the push buttons and electromagnet 58 is broken at the switch 65. However, the closing of limit switch 50 sets up a shunt circuit around the push buttons and the relay, from the line wire L through conductors 55 and 8l and switch 88, and by Way of conductor 89, switch 56 and conductors 90 and Si to magnet coil 58 and line Wire L2. The circuit through solenoid. 44 is therefore maintained, and the knife bar ascends to complete its stroke. When it reaches the top of its stroke the limit switch 50 again opens and the clutch is disengaged. Thelimit switch 49 then closes again, and provided the push buttons are in their released position, so that they bridge the contacts 70, 'H and 12, i3, the relay coil 63 is again energized and its sealing circuit established. The machine is then ready for the neXt operation. However, should the operator keep the push buttons 4l and 48 depressed through the complete stroke of the knife, the machine will nevertheless stop at the end of the stroke, because a circuit cannot be set up through limit switch 49 and relay coil 63 without the bridging of contacts l5, 'Il and 12, 'I3 of the push buttons.

In order to start the machine for a succeeding cut, it is always necessary for the operator to release the push buttons sometime after the cut is made, and they must remain released at the time the limit switch 9 closes in order that no other cut may be made immediately. The operator therefore is required to perform a definite act before the knife may descend, and thus the operation of the knife through inadvertence is prevented. A second descent of the knife immediately after a cut was made could not harm the operator, because both of his hands would necessarily be occupied with the controls, but it might harm a helper -engaged with the work of preparing the material for a succeeding cut.

The jogging of the knife bar up as well as down is useful when the knife is being changed or when the machine is being prepared for a run of work. Jogging on the downward stroke is accomplished as heretofore explain-ed. When it is desired to jog on the upward stroke, the operator must rst throw switch 88 to dot and dash position, which provides a circuit from line wire L' through conductors and 8l, switch 88 and conductor 9i to contact 'Fl of push button 48, and across the push button to contact 'l5 and through conductor 8l to contact 'l5 of push button lil, across the push button to contact 7M, and by way of contacts SES and 6l to magnet coil 58 and line wire L2. Thus the solenoid 44 may be maintained energized momentarily with a correspondingly short engagement of the clutch.

Variations from the described structure may be employed. Accordingly, I desire it to be understood that the scope of the invention is to be regarded as defined exclusively by the appended claims rather than by the foregoing description or accompanying illustration.

Having thus described my invention, I claim:

1. In a machine of the class described, a cutting tool, means for reciprocating the tool comprising a clutch, an electric shifter for said clutch, an electric circuit controlling the shifter', a twohand control for said circuit, a switch in said circuit, a relay for operating said switch, au

electric circuit for said relay, a switch in said relay circuit, and means associated with the tool operating mechanism for holding said last named switch closed duringthe work stroke of the tool and open during the returnl stroke.

2. In a machine of the class described, a cutting tool,a shaft coupled to the tool for reciprocating the latter, means for operating said shaft comprising a clutch, an electric'shifter for throwing said clutch to operative position, an electric circuit controlling the shifter, a two-hand control for said circuit, said 'circuit also comprising a switch, a relay for operating the switch, and means for energizing said relay during the working stroke of the tool, said means requiring initially the release of the two-hand control.

3. In a machine of the class described, a cutting tool, a shaft coupled to the tool for reciprocating the latter, means for operating said shaft comprising a clutch, an electric shifter for throwing said clutch to operative position, an electric circuit controlling z the shifter, a twohand control for said circuit, said circuit also comprising a switch, a relay for operating the switch, means for actuating said relay during the working stroke of the tool, said means requiring initially the release of the two-hand control, and a sealing circuit for said relay, said sealing circuit comprising a switch operated by the rotation of said shaft for maintaining said sealing circuit closed during the work stroke only of the tool.

4. In a machine of the class described, a cutting tool, a shaft coupled to the tool for reciprocating the latter, means for operating said shaft comprising a clutch, an electric shifter for throwing said clutch to operative position, an electric circuit controlling the shifter, a manual control for said circuit, and means independent of the manual control means for automatically instituting a break in the circuit at the end of the work stroke, said means tending to automatically close said break at the beginning of the succeeding work stroke, the closing of' said break requiring further a positive movement of the manual control at or prior to the beginning of said succeeding work stroke.

5. In a machine of the class described, a cutting tool, a shaft coupled to the tool for reciprocating the latter, means for operating said shaft comprising a clutch, an electric shifter for throwing said clutch to operative position, an electric circuit controlling the shifter, a manual control for said circuit, means for automatically breaking the circuit at the end of the work stroke, said means tending to automatically close said break at the beginning of the succeeding work stroke, the closing of said break in the circuit requiring further a positive `movement of the manual control at or prior to the beginning of said succeeding work stroke, a shunt circuit around said shifter controlling circuit, and 'a switch therein operated by the machine to maintain the shunt closed during the return stroke only of the tool.

6. In a machine of the class described, a vertically reciprocable tool, operating means for the tool comprising a clutch, electric means for operating said clutch, a manual control for said electric means normally effective only during the ywork stroke of the tool, means for disconnectsaid manual control at the end of the Work stroke, electric' connections independent of said manual control for maintaining the clutch in operative position on the return stroke, and a two-way switch for disabling said electric connections and for putting said manual control into operation on the return stroke, whereby the tool may be jogged on its return stroke.

. WALTER C. EICKMAN.

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