US3168739A - Timing regulators - Google Patents
Timing regulators Download PDFInfo
- Publication number
- US3168739A US3168739A US10905A US1090560A US3168739A US 3168739 A US3168739 A US 3168739A US 10905 A US10905 A US 10905A US 1090560 A US1090560 A US 1090560A US 3168739 A US3168739 A US 3168739A
- Authority
- US
- United States
- Prior art keywords
- balls
- ring
- discs
- track
- disc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 210000000038 chest Anatomy 0.000 description 2
- 238000010409 ironing Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000013208 measuring procedure Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 239000002907 paramagnetic material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H45/00—Folding thin material
- B65H45/02—Folding limp material without application of pressure to define or form crease lines
- B65H45/06—Folding webs
- B65H45/10—Folding webs transversely
- B65H45/101—Folding webs transversely in combination with laying, i.e. forming a zig-zag pile
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F89/00—Apparatus for folding textile articles with or without stapling
-
- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F3/00—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G21/00—Mechanical apparatus for control of a series of operations, i.e. programme control, e.g. involving a set of cams
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
- H01H43/02—Details
- H01H43/04—Means for time setting
- H01H43/06—Means for time setting comprising separately adjustable parts for each programme step, e.g. with tappets
Definitions
- Ciaims. (Cl. 346-74)
- This invention relates to timing devices for the control of certain defined junctures, for instance diiierent steps in a courseor measures or manoeuvres in a series of such courses' i Bymeans of the device according to the invention it is possible in the first place to divide an arbitrary period of time up into a number of intervals of certain determined difterent lengths or, secondly, to divide an arbitrary length in a certain defined manner.
- the invention pertains to the storing upon a conveyor running at a constant transport speed of markings from one or more time defining members after transport over a defined length.
- the markings or recordings may be obtained by means of magnetic or visible marks, or by means of bodies which may be transferredtothe above mentioned conveyor at a certain junction under the control of the time defining members. In the latter case balls, members or elements attached by hooks, magnetic bodies, slides or such like may be used.
- FIG, 1 gives in a side view the principle of a timing regulator consisting of a system of endless conveyors driven at different speeds.
- FIG. 2 is an end view of the same device.
- FIG. 3 shows in a side view the principle of a timing device having circular conveyor paths.
- FIG. 4 is an axial section of the same device.
- FIG. 5 shows a wiring diagram of a servo-mechanism.
- FIG. 6 is an axial section through a timing regulator based upon the principle visualized in FIGS. 3 and 4.
- FIG. 7 is a section along the 7-7 line in FIG. 6.
- FIGS. 8 and 9 show a detail arrangement seen in two different directions at right angles to each other.
- a regulator strip 1 runs on two rollers 2 and 3 at constant velocity.
- a further number of endless tapes or strips 4, 5, 6 each defined for its special time interval, and running on pulleys, are arranged to cooperate with strip 1.
- This latter strip is given two head marks, H and H situated from one another at a distance A, which corresponds to the magnitude which is to be divided up into sections.
- the magnitude in question represents a time interval, within which certain defined junctures are to be determined.
- the strips 4, 5 and 6 are given different velocities proportioned according to the length of time intervals.
- the strips 4, 5, 6 are given velocities proportional to A/4, 2A/4 and 3A/4 respectively.
- all the tapes orstr-ips may be of magnetic material, which makes possible mag netic marking and erasing.
- the shafts for the rollers 2 and 3 and for the pulleys are parallel and rotate in the directions indicated by the arrows, so that adjacent parts of the strip group are moving in the same direction.
- the pulleys are suitably connected to their respective shafts by means of friction couplings, which make possible the achievement of one and the same velocity during the short moment at which the-strips are pressed together for the above transfer of marks.
- the whole clamp arrangement may be supported displaceably in the direction of the movement of the strips, so that the clamps are given the same speed as that of strip 1.
- a sectional point situated at u/ v of A, where the u-value lies between zero and v, may be obtained by giving an auxiliary strip the velocity u/v, 1f the speed of the control strip is put at 1.
- the marks may be constituted by visual signs which are made readable by photocells or the like.
- the marks, which during the measuring procedure are transferred from one strip to another, may in this case be obtained by means'of for instance stamps, types of other rmpression members.
- bodies as marks conveyors of the type described above may be arranged near each other on the same level and means arranged for transferof the mark bodies from one strip to another.
- Electric impulsegiving contact organs are fitted in the path of the mark bodies on the conveyor.
- metal strip of paramagnetic material for instance steel strip, in combination with mark bodies formed by small permanent magnets.
- the main members of this embodiment consist of three circular discs, 21, 22 and 23, which are mutually concentrically supported and which may .rotatewithin a stand ring 24 concentric with the discs.
- the inside surface 25 of this ring is cylindrical andconcentrically arranged in relation to the discs and forms a roller track with a pollone current lead 46 and an electromagnet i'l which, in
- the discs 21, 22 and V 23 have a cylindrical circumference formed by an elastically yielding layer, having identical outer diameter for all three discs. Between'the discs and the roller traclc 25 there is a space of slightly less radial dimension thanthe diameter ofthe balls 26 so that, when-the discs rotate, the balls will roll with a certain pressure ,on the track 25, whereby sliding is prevented.
- the balls'm'ay be ball bearing balls of one and the same dimension.
- Thediscs 21 to 23 are arranged to rotate, for exaxple through a gear, with mutually different speeds; For the disc 22 a speed of rotation is chosen which turns the disc approximately half a revolution during the course of time which is actual for the case at hand. The discs 21' 5 and 23 are driven more slowly at a speed which is proper tional to the time sections which areto be marked.
- two ball storing boxes 28 and:29 are arranged, one for each disc ,21 and 23 respectively.
- 'I'heseball boxes are formed aschannels havingsuch a cross sectional area that the balls can move easily. from an inlet 30 at the upper part of the'box downwards to an outlet 31.
- the inlet and outlet are in communication with the space between the discs and the roller track, so that the balls may roll in on this latter, and, having travelled their track length, return down into theirstoring boxes.
- the outlet 31 is approaching the track tangentially, enabling the balls 26 when rolling on said track, tomove in the direction of rotation of the discs 21 and 23, as
- the balls are retained in their storing boxes by means of an adjustable blocking disc 33 which is so arranged and designed that, when reset clock-wise half a revolution, one ball is released to roll down through the outlet 31 during which operation the remaining balls are retained in the ball box.
- the disc 33 is circular and mount ed on a shaft 34 and designed with 'a segmented cut-away 35 which, according to FIG. 3, is turned upwards. When the cutaway 35 is turned downwards by the turning clockwise of the disc 33,0ne ball is released, whereas the next;
- the electromagnet 56' is provided with a core 57 firmly connected to a latch-bolt 58 which carries a contact memfber'59 and is arranged to engage one of two notches 60 in a disc 61.
- This latter may be designed to have one or more such notches situated at different peripheraldis tances.
- the disc 61 is formed with two diametrically situated notches for the latch-bolt,
- disc .61 is driven by a shaft 62, which may be connected to a driven shaft 64 by means of. a friction coupling '63. This takes place under the control of the electromagnet 52. When'this is magnetized over the switch 50, the coupling 63 is brought into active position. The switch 50 is closed at the magnetizing of the electromagnet 56, whereat at the same time the latch-bolt 53 is withdrawn from the. notch 60 of the disc 61.. This takes place immediately one of the contact members 40, 41 isac'tuated by avball 26 at the upper part of the track.
- the disc 61 according to the examples shown, has been turned half a revolution, the latch-bolt 58 engages the second notch, whereby the disc 61 is stopped.
- the current to the electromagnet 52 is shut off and the coupling 63 is dis connected.
- the shaft 62 is provided with an excenter member 65, which acts upon an arm 67 swingably supported at 66.
- the arm 67 is kept in errgagement with the excenter 65by means of a spring 68.
- bothballs are transferred axially inwards onto the track 25 so as to engagethe disc 22 as shown in FIG; 4.
- This transfer of the balls is achieved by means of two ring halves 36 and 37 which, each from its side, project in between the track. 25 and the discs 21-23. In FIG. 4 are shown the ring halves in the above inserted position, where the balls are transferred to engage the disc 22.
- Chain-dotted lines 38 and 39 indicate the outer inoperative position of the ring halves.
- the arms '67 may be used as folding arm in a folding mechanism for mangled clothes for instance, but it may also represent a motion. contraption generally, having a forward and return motion.
- the electromagnet47 may be used. for the manipulation of the ring halves 36 and 37 (FIGS; 3 and 4), whereby the switch 45 is intended to close at the beginning of the measuring period and to be kept closed throughout this A course.
- the electromagnet 47 when energized, by the aid of a suitable mechanism moves the ring halves 36 and 37 from their inner position shown in FIG. 3 into the outer positions 38, 39 and retains them in this position,
- the mechanism mentioned may even serve in the angular adjustment of the blocking disc 33, so that' one ball from each ball rack 28 and 291s enabled to enter onto the track 25 for further transport during the measuring course, as has been. described above.
- FIGS. 6 and 7 a chosen timing regulator design is shown in accordance with the invention.
- This design is based upon the principle described in connection with FIGS. 3 to 5 and is particularly suitable in cooperation with a folding mechanism for mangled'clothes.
- the'folding contraption works synchronously with the mangle, which may comprise a number of mangle rollers co-operating with ironing chests which together form the so-called mangle table over which the mangled garment are fed from the inlet of the mangle by means of the rollers over the different ironing chests and delivered to the folding contraption mounted next to the mangle.
- an input driving shaft 72 is arranged to be driven synchronously with the driving shaft of the mangle, suitably connected with one of the mangle rollers.
- the shaft is supported in two ball bearings 73, 74 and is fitted with fixed driving gear wheels 75, 76 and 77 arranged side by side.
- ball bearings 78 and 79 is supported a shaft 80 which at one end is provided with a fixed gear wheel 81, which engages the gear wheel 75 on shaft 72.
- the shaft 80 is provided with a fixed cylindrical disc 82, situated near the ball bearing 79.
- the disc has on its cylindrical surface an elastic, Wear resistant layer 83 of even thickness.
- the shaft 80 is surrounded by a hollow shaft 84 which at both ends is rotatably supported on the shaft 80 by means of pin bearings 85.
- a gear wheel 86 is fixed onto the outer end of the shaft 84 and this wheel, which is concentric with the gear wheel 81 and situated next to this is arranged to engage the driving wheel 76.
- the shaft 84 is fixed into a cylindrical disc 87, which is co-axial with the disc 82 and situated next to this.
- Still one more hollow shaft 88 is arranged rotatably on the shaft 84 by means of pin bearings 89.
- the shafts 80, 84 and 88 are mutually co-axial and mutually rotatable.
- the shaft 88 is provided with a fixed gear wheel 90 arranged next to the gear wheel 86 and engaging the driving wheel 77. At its other end the shaft 88 is supporting a fixed cylindrical disc 91, which is co-axial with the discs 82 and 87 and placed next to the latter disc.
- the discs 87 and 91 are on their cylindrical surfaces coated with a layer of elastic material of the same kind and thickness as the layer 83 on the disc 82.
- the discs and the layers are of such dimensions that the discs have identical outer diameters.
- the discs 82, 87 and 91 thus correspond to the discs 21 to 23 in FIGS. 3 and 4.
- the ratios of reduction between the gear wheels 75 and 81, 76 and 86, 77 and 90 are 1:4, 1:1 and 3:4 respectively, whereby the shaft 80 is driven at 1/4, shaft 84 at 1/1 and shaft 88 at 3/4 of the rpm. of the shaft 72.
- a stand ring 92 concentric with the discs 82, 87 and 91, is fixed in the cover 71.
- the ring has a cylindrical outer and inner surface, whereby this latter provides a cylindrical inner track 93 having a hardened and polished surface.
- This track is situated at a distance from the outer tracks of the discs 82, 87 and 91.
- the inner track 93 corresponds to the roller track 25 in FIGS. 3 and 4 and the purpose of the discs mentioned is to roll the balls on the track 93 by means of the elastic layer of the discs, whereby the distance between this layer and the track 93 is slightly less than the diameter of the balls.
- the ring 92 is at each side provided with a magazine 95 for balls 94 lying in a row on a track concentric with the ring.
- Each ball magazine 95 is formed as a groove with rectangular cross section in the side surface of the ring. This groove is covered with a plate 96, so that a channel is formed.
- the release of balls from the magazines 95 is controlled by the aid of a valve contraption consisting of a turnably supported shaft 97 projecting axially through the ring 92 and partly through the ball magazines.
- the shaft 97 is provided with a notch 98, which is so designed that, when turning the shaft approximately 60 from an original position, one ball is released from each of the magazines, whereas the remaining balls are retained. The release ball rolls downwards to the track 93. When the shaft 97 is turned back into its starting position, the ball next in turn in the magazine is caught in the notch 98.
- two contact arms 100 and 101 are mounted at the upper part of the track 93 . These arms extend into the space between the disc 87 and the track 93 from each side of the ring 92.
- the contact arms moreover, are connected to the control shaft of switches 102 which are connected in a circuit for the control of the folding mechanism.
- the shaft 97 is at its one end fixed to a control lever 103 which is forked at its outer end and arranged to engage a pin 104 on a control ring 105.
- This latter ring surrounds the stationary ring 92 and is turnably mounted onto this by means of balls 106, 107.
- the balls roll on the outer surface of the ring 92 and in concentric grooves 108 of the ring 105.
- This ring is turnable between two end'positions, situated at such a distance from each other that the control lever 103 may be turned downwards in an angle approximately 60 from the position shown in FIG. 7.
- control ring 105 By means of an upwards projecting link rod 110 the control ring 105 is connected with the core 111 of a. pulling electromagnet 112 mounted in a carrier 113 which is fixed onto the cover 71.
- The'lower .end of the link rod is connected to the ring 105 by a pin 114.
- the ring has at its circumference a peripherally running groove 115 of such width as to receive the link I0 110.
- the core 111 By connecting theelectromagnet 112 into an electric circuit, the core 111 is attracted and is moved to an upper position according to FIG. 7, whereby the link rod 110 is pulled upwards and the control lever 103 is pushed upwards, due to the engagement with the pin 104, from the position shown in dotted lines to the position drawn in full.
- the control ring 105 is provided with three pairs of wedgeformed elements 121, 122 and 123 spread over approximately half the circumference of the ring. In FIGS.,
- each element is screwed together with the side surface 125 of the control ring 105.
- the surface 126 of the wedge itself which inclines relatively to the said side surface 125, extends to a surface 127 which is parallel to the side surface 125 of the ring 105.
- the Wedge bodies are formed with a radius identical to the ring 105.
- the purpose of the wedge elements is to shift pins 130 axially outwards relatively to the track 93 during clock-wise turning of the control ring 105 according to FIG. 7.
- the pins are radially fixed into ring halves 131.
- Each of the ring halves is supported axially moveable at each side of the ball track ring 92 and serves the same purpose as the ring halves 36 and 37 described in connection with FIGS. 3 and 4.
- these are provided with three guiding rods 133 arranged at mutual peripheral distances. These rods are tube-formed and moveable in bores 134 running axially through the ring 92.
- the tube-formed guide rods 133 are also arranged in pairs near the wedges elements, whereat the rods in one pair are introduced, each from its side, in a common bore 134.
- a spring 135 is arranged, tending to pull the two ring halves 131 towards each other.
- Each end part of the spring 135 is fixed onto the ring-half by a splint 136.
- the ring halves are provided with a cylindric flange 137 arranged to be inserted into the space between the track 93 and the discs 82, 87 and 91 for the purpose of axial movement of the balls 94 out of engagement with the discs 82 and 91 and into engagement with the disc 87.
- the ring halves 131 are normally situated in the above mentioned inserted position indicated by the dotted lines.
- the outer position shown in FIGS. 6 and 7 has been obtained by the turning clock-wise of the control ring 105 so far that the pins 130 rest against the surfaces 127 of the wedge elements. In this position balls, released from the ball magazines, may run into the track.
- the control ring 105 When the electromagnet 112 is deenergized the control ring 105 is returned to its starting position by the weight of the link rod 110 and the core 111, whereat the surfaces 127 of the wedges are brought out of engagement with the pins 130 which then engage the inclined surfaces 126.
- the pins may be provided with a roller which rolls on the wedge surfaces.
- FIGS. 6 m9 The operation of the mechanism. shown in FIGS. 6 m9 is shortly as follows.
- cording to theexample is one third of the way of the other ball.
- the electromagnet 1&2 is deenergized and the ring- 105 is turned back into its starting position whereby the ring halves 132 are pushed into.
- the, rpm. of the input driving shaft 72 may.be reduced by means of an intermediate gearing. If, however, by mistake, an extended measuring period should be chosen, there is no risk of damaging the mechanism, as, in such a case, the balls carried by the discs 82 and 91 pass under bent-up parts 142 and 143 of the contact arms 100 and 101.
- elastic layer 813 on'the circumference of the discs may be replaced by a strip of magnetic material and the balls replaced by permanent magnets in the shape of discs or'the like, which are charged from magazines, made of unmagnetic material, into contact with the magnetic disc strips. Apart from this, the design remains unaltered.
- the track 93 is, however, in this case superfluous.
- a timingdevice for supervision of defined junctures comprisingone main conveyor and at least two auxiliary conveyors, said conveyors being arranged to run at different and constant speeds side by side, the main conveyor being arranged to run at higher speed than the auxiliary conveyors, means for driving said auxiliary conveyors at predetermined and dilterent speeds, means for marking a point on each of the auxiliary conveyors at one and the same moment, means for transferring said marks toithe main conveyor after a given time period and stationary means arranged in the path of said two marks of themain conveyor adapted to be influenced by saidmarks.
- Atiming device and near. and in the same direction as one part of the main conveyor said device further comprising clamping means arranged to press the auxiliary conveyorssduring a short time interval against the main conveyor so that magnetic recordings maybe transferred from the auxiliary conveyors to the main conveyor.
- a timing device as claimed in claim 1 comprising means for placing a body on each of the auxiliary conveyors, means for transferring said, bodies to the main conveyor after a given time period and stationary'means.
- a timing device as claimed in claim conveyors consist of circular and coaxial discs having the same diameter and a common cylindrical surfaeewith a larger radius than the discs surrounding the same, means for placing a ball on each of the auxiliary conveyors, means for transferring said balls to the main conveyor after a given time period and stationary'means in the path of said balls on themain conveyor adapted to be influenced by said balls.
- a timing devicefor supervision of defined junctures comprising one main conveyor and at least two auxiliary conveyors, said conveyors being arranged town at different and constant speeds side by side, the main conveyor beingarranged to run at a higher speed than the auxiliary conveyors, means, for driving said auxiliary conveyors at predetermined and different speeds, said conveyors consisting of circular and coaxial discs having the same diameter and a common cylindrical surface with a larger radius than the discs surrounding the same, said cylindrical surface constituting the inner surface of a'ring-shaped member providing passages for balls and constituting a ball magazine, meansfor placing a ballon each of the auxiliary conveyors, means for transferring said balls to the main conveyor after a given time period and stationary means in the path of said balls on the main conveyor adapted to be influenced by said balls.
- a timing. device as claimed in claim 6, comprising contact members for electric switches arranged: at the main conveyor to be influenced by the balls travelling on the latter said conveyor.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Textile Engineering (AREA)
- Specific Conveyance Elements (AREA)
- Transmission Devices (AREA)
- Friction Gearing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE212559 | 1959-03-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3168739A true US3168739A (en) | 1965-02-02 |
Family
ID=20259410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10905A Expired - Lifetime US3168739A (en) | 1959-03-05 | 1960-02-25 | Timing regulators |
Country Status (6)
Country | Link |
---|---|
US (1) | US3168739A (en, 2012) |
BE (1) | BE588313A (en, 2012) |
CH (1) | CH355637A (en, 2012) |
DE (1) | DE1210599B (en, 2012) |
GB (1) | GB931226A (en, 2012) |
NL (1) | NL247169A (en, 2012) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2895014A (en) * | 1953-07-06 | 1959-07-14 | United Geophysical Corp | Magnetic recording head-moving mechanism |
US2938195A (en) * | 1954-07-08 | 1960-05-24 | Clevite Corp | Multichannel magnetic recording |
-
0
- NL NL247169D patent/NL247169A/xx unknown
-
1960
- 1960-01-08 CH CH355637D patent/CH355637A/de unknown
- 1960-02-25 US US10905A patent/US3168739A/en not_active Expired - Lifetime
- 1960-03-02 DE DEF30664A patent/DE1210599B/de active Pending
- 1960-03-04 BE BE588313A patent/BE588313A/fr unknown
- 1960-03-04 GB GB7858/60A patent/GB931226A/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2895014A (en) * | 1953-07-06 | 1959-07-14 | United Geophysical Corp | Magnetic recording head-moving mechanism |
US2938195A (en) * | 1954-07-08 | 1960-05-24 | Clevite Corp | Multichannel magnetic recording |
Also Published As
Publication number | Publication date |
---|---|
NL247169A (en, 2012) | |
CH355637A (de) | 1961-07-15 |
BE588313A (fr) | 1960-07-01 |
DE1210599B (de) | 1966-02-10 |
GB931226A (en) | 1963-07-17 |
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