Brother Kogyo Kabushiki-Kaisha

Brother Industries, Ltd.

Noboru Hirose

Michio Ishikawa

Kazuo Itoh

Yasuyo Isaji

Mitsuo Kobayashi

Takashi Nozu

Kikuo Watanabe

Shozo Aoshima

Yoshinari Mori

Keiichi Sato

Hisaaki Yamane

Akira Hirose

When machining of a workpiece mounted on a first pallet by a machine tool is ended, power of a driving motor is transmitted through a cylindrical cam and a cam follower to a clamp member to unclamp a first pallet clamped on a table of the machine tool by the clamp member. Then, the power is transmitted to a swing arm to unload the first pallet from the table to a stand-by position and a second pallet, mounting thereon a workpiece to be machined, is loaded from the stand-by position to the table by the swing arm. The second pallet is the clamped on the table by the clamp member and the pallet exchange operation is complete.

Pallet exchanging device for machine tool

A machine tool with a vertically reciprocating spindle head has an automatic tool changer including a rotatingly indexable tool support connected to the machine tool frame and vertically movable independently of the spindle head, a first cam-and-crank mechanism activated by spindle head vertical movement to move the tool support with the spindle head during a first portion of the tool changing operation and away from the spindle head during a second portion of the tool changing operation, a second cam-and-crank mechanism also activated by spindle head vertical movement for opening and closing a tool holder on the tool support during another portion of the tool changing operation, a tool holder with a pair of rotatably supported L-shaped fingers which hold a tool in a substantially perpendicular direction to the axes of finger rotation, a tool taking device for taking a tool out of a tool magazine, and a vertical stop for preventing vertical movement of the tool support with the spindle head into the machining region.

Machine tool

A machine tool having a main spindle head and an indexing table those being inclined with respect to a horizontal plane. The machine tool comprises the main spindle head, a main spindle, a reciprocation drive means and the indexing table. The main spindle is provided with a tool mount portion at one end portion thereof for mounting a tool, and the reciprocation drive means drives the main spindle head in an axial direction of the main spindle. The indexing table mounts thereon a workpiece and is angularly rotatable about its central axis. Further, an indexing apparatus is also disclosed. The apparatus comprises a base frame, an indexing table, an indexing shaft, a single drive source, a drive means, a follower member, coupling means and shifting means. The drive means is connected to the single drive source, and the follower member is connected to the indexing shaft and is engageable with the drive means for rotating the indexing shaft about its axis. The shifting means is operably provided for moving said indexing shaft in axial direction thereof in response to the drive means. The axial movement of the indexing shaft provides engagement and disengagement of the coupling means.

Machine tool indexing apparatus

Drilling, tapping and milling machine

An automatic tool changer in a machine tool for automatically changing a tool. The machine tool includes a main frame, a main spindle head movably provided to the main frame, a main spindle rotatably disposed in the main spindle head, the main spindle head being movable in an axial direction of the main spindle, and a tool magazine provided with a rotatable magazine base for holding a plurality of tool holders and for rotationally indexing one of the tool holders, whereby the one of rotationally indexed tool holder is changed by a tool holder provided at the main spindle. The automatic tool changer comprises; a plurality of tool holder gripping means radially arranged on and pivotably supported to the magazine base, the tool magazine being secured to a stationary portion of the main frame, and means for pivotting one of the tool holder gripping means rotationally indexed independent of remaining tool holder gripping means. The pivotting means moves the one of tool holder gripping means toward and away from the main spindle, and the pivotting means moves the one of tool holder gripping means away from the main spindle when the main spindle head is moved for machining to a workpiece.

Automatic tool changer in machine tool

A machine tool with a vertically reciprocating spindle head has an automatic tool changer including a rotatingly indexable tool support connected to the machine tool frame and vertically movable independently of the spindle head, a first cam-and-crank mechanism activated by spindle head vertical movement to move the tool support with the spindle head during a portion of the tool changing operation, a second cam-and-crank mechanism also activated by spindle head vertical movement for opening and closing a tool holder on the tool support during another portion of the tool changing operation, and a vertical stop for preventing vertical movement of the tool support with the spindle head into the machining region.

A drilling machine is provided with a quill feed device for reciprocating a quill, a driving member and a driven member, disposed between a spindle rotatably supported by the quill and a driving source therefor in such a manner as to produce a relative angular displacement therebetween according to magnitude of a load applied on a tool held by the spindle, a detector generating a series of pulse signals correlated to the relative angular displacement between both members, a counter numerically counting the pulse signals generated from the detector in respect of one rotation of the spindle, a memory memorizing numerical data, corresponding to the relative angular displacement while the tool being separated from a workpiece, counted by the counter device, and a comparator for comparing the value memorized in the memory and an actual counted value in the counter. The quill is, in the event the actual counted becomes larger than the memorized value by a predetermined limit, returned backwards once before being re-advanced.

Cyclic drilling machine

An apparatus for detecting torque transmitted between two rotary members. A driving member and a driven member are connected via a transmission spring, permitting relative angular displacement therebetween. On either one of the two rotary members a wheel disk having a number of slits arranged in a circle is provided. A detector, such as a photocoupler, for detecting the slits is disposed on a frame adjacent to the wheel disk. A shutter disk with a shutter portion for partially covering the slits is attached to the other rotary member at an opposed posture to the wheel disk. The number of slits detected by the detector is varied according to the relative angular displacement between the driving member and the driven member while they are in rotation, and the torque between both rotary members may be numerically determined from the number of slits detected.

Torque detecting apparatus

A drilling machine provided with a feed control device. The feed control device includes a hydraulic cylinder to be engaged with a quill, which is reciprocated by a pneumatic feed device, on the forward midway thereof, a slidable member disposed on a frame in such a manner as to be able to move by a predetermined distance in the movement direction of a ram of the hydraulic cylinder, and coupling device retained on the slidable member for linking the slidable member and the ram. When the quill is once returned backwards in the course of a drilling cycle the ram is also returned backwards together with the slidable member by the predetermined distance, and when the quill is moved forward again the quill is engaged with the ram at a position a little short of the position where the previous drilling cycle was interrupted for being switched there from rapid speed down to slow speed.

Drilling machine

The machine tool provided with a machine frame adapted to be attachable to a stand, a pneumatic cylinder for reciprocating a quill on the machine frame, and a feed control device for controlling the forward moving speed of the quill comprising a hydraulic cylinder which is parallelly disposed to the quill and includes a piston assembly having a projecting portion engageable with the quill and a liquid tank. The quill is moved, until it is engaged with the projecting portion in the forward moving thereof, at a rapid feed speed and after the engagement at a controlled feed speed by the feed control device. The liquid tank has a pair of openings arranged such that either one of the two may constantly come under the liquid surface in the tank no matter in what posture the machine frame may be attached to the stand. The feed control device comprises a connecting device including two passages respectively communicated with each of the two openings and a joining device for selectively joining one of the two passages which is in communication with one of the pair of openings situated under the liquid surface with a cylinder chamber of the hydraulic cylinder.

A drilling machine comprises a quill, pneumatic cylinder for reciprocating the quill in the forward and backward direction, a feed control device which includes a liquid cylinder parallelly disposed to the quill and provided with a piston assembly with a projecting portion engageable with the quill for controlling the advancing speed of the quill, one-way clutch for allowing the piston assembly only the forward movement thereof by engaging with the projecting portion of the piston assembly, and an operation control device for repeatedly reciprocating the quill. The quill is advanced firstly at a rapid speed; upon engaging with the projecting portion of the piston assembly, the quill is advanced at a regulated speed by the liquid cylinder. When the quill has completed several times of reciprocation movement under the control of the operation control device, one working cycle is finished. When the quill assembly has reached the forwardmost position the operation control device is suspended of its controlling function for returning the quill to the original position. Returning of the quill to the original position releases the one-way clutch accompanied by the returning of the projecting portion of the piston assembly with the aid of a return spring.

Growing community of inventors

Nagoya, Japan

Noboru Hirose