JPH0570734U - Pressing device for upper roll in roll feeder - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pressing device for an upper roll in a roll feeder that can perform high-precision press working using a material having no pin hole for inserting a pilot pin. [Structure] A yoke 5 pivotally supported on a machine frame 1 so that an upper roll can be rotated is urged downward by a spring 19 of a spring rod 15, and a material is sandwiched between upper and lower rolls for feeding. In the roll feeder 50 for feeding, the air cylinder 10 is fixed to the upper part of the machine frame 1, and the spring adjuster 17 urged by the spring 19 of the spring rod 15 is screwed into the bracket 16 so that the left and right brackets 16 are attached to each other. The fixed connecting shaft 20 is engaged with the piston rod 13, and the sensing piece 24 is attached to the drive shaft 21 that rotates in synchronization with the crank shaft.
A pressing device for the upper roll in the roll feeder 50, characterized in that the upper cylinder is attached, the sensing piece 24 is detected by the sensor 25, and the air cylinder 10 is operated to change the pressing force of the upper roll strongly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressing device that presses an upper roll against a lower roll in a roll feeder that intermittently feeds a material to a press by a predetermined length.

[0002]

[Prior Art]

 The upper roll pressing device in the conventional roll feeder rotatably supports the upper roll, and the yoke pivotally supported by the machine frame is biased by the spring of the spring rod to synchronize the upper roll with the crankshaft of the press machine. It was designed to press against a rotating lower roll and sandwich the material between the upper and lower rolls for feeding.

[0003]

[Problems to be solved by the device]

 A roll feeder that feeds material by sandwiching it with upper and lower rolls is suitable for supplying material to a high-speed pressing machine because the roll is rotating, but the roll repeats intermittent rotation with sudden rotation and sudden stop. Therefore, it is unavoidable that the feed amount of the material for the predetermined length varies by about ± 0,05 mm.

However, since pressed products are required to have a high precision of ± 0,01 mm or less, conventionally, a pin-shaped material in which pin holes are formed at equal intervals on both sides of a tape-shaped material is used. After the material is freed by pushing up the yoke with the lifter that moves up and down by the pilot release cam that rotates in synchronization with the crankshaft, insert the pilot pin provided in the upper die into the material pin hole and After the position of the fed material was corrected, it was pressed.

When using a pin-hole material, the pin-hole portions on both sides of the material must be discarded after pressing. In general, the cost of stamping is low, so improving the yield of materials along with high precision is an issue for profit.

This invention solves the above-mentioned problem, and an object of the present invention is to provide a pressing device for an upper roll in a roll feeder that enables high-precision press working using a material without pin holes. To do.

[0007]

[Means for Solving the Problems]

 In the upper roll pressing device according to the present invention, the yoke, which rotatably supports the upper roll and is swingably supported by the machine frame, is urged downward by the spring of the spring rod to lower the upper roll. In the roll feeder that presses the roll and feeds it by sandwiching the material with the lower roll, the air cylinder is fixed to the upper part of the machine frame, and the spring adjuster urged by the spring of the sprinkling rod is used. The sensing piece is fixed to the drive shaft that is engaged with the piston rod of the air cylinder and rotates in synchronization with the crankshaft, and the sensor provided on the machine frame detects the sensing piece to operate the eagle linder. It is characterized in that it is configured.

[0008]

[Action]

 In the upper roll pressing device according to the present invention, since the spring adjuster is engaged with the piston rod of the air conditioner, when the air cylinder is activated and the piston rod projects, the spring of the spring rod is compressed and the upper roll is pushed. The pressure increases. Therefore, it is possible to change the holding force for holding the material between the upper and lower rolls while feeding the material.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

A lower roll 3 integral with a shaft 2 which is rotatably supported by a machine frame 1 is adapted to intermittently rotate in synchronization with a crank shaft, as is known. A yoke 5 is swingably supported on a support shaft 4 provided in the machine frame 1, and an upper roll 7 is rotatably supported by a shaft 6 attached to the yoke 5 via a bear ring 8.

An air cylinder 10 is attached to a bracket 9 fixed on the top plate 1 a of the machine frame 1. This air cylinder 10 is a single-acting cylinder in which a piston 12 is returned upward by a spring 11.

The left and right spring rods 15 whose lower ends are fitted in the recesses 14 on the upper surface of the yoke 5 are loosely fitted in the spring adjusters 17 screwed into the L-shaped brackets 16, and the flange parts of the spring adjusters 17 and the spring rods 15 are fitted. A spring 19 is mounted between the 18 parts. The left and right brackets 16, which are integrally formed by fixing the connecting shaft 20 to the left and right brackets 16, are mounted on the top plate 1a of the machine frame 1 so as to be vertically movable. Due to the elasticity of the left and right springs 19, the large diameter portion 20a of the connecting shaft 20 contacts the tip of the piston rod 13 of the air cylinder 10, and the upper roll 7 presses the lower roll 3. Therefore, the pressing force of the upper roll, which is in pressure contact with the lower roll 3, becomes stronger when the air cylinder 10 is actuated and moves downward by a predetermined stroke (1).

Reference numeral 21 denotes a drive shaft that rotates in synchronization with the crank shaft, and is rotatably supported by the machine frame 1. A pilot release cam 22 is fixed to the drive shaft 21 by a cup screw 23, and a sensing piece 24 having a semicircular outer shape is screwed to the pilot release cam 22. When the sensor 25 attached to the machine casing 1 detects the sensing piece 24, the solenoid valve 27 is excited via the controller 27, and compressed air is supplied to the air cylinder 10. In this embodiment, when the top dead center of the crank shaft is 0 ° and the bottom dead center is 180 °, the rotation angle of the crank shaft from 180 ° to 360 ° is detected by the sensing piece 24.

A cross-shaped cam arm 32 is pivotally attached to an arm shaft 31 provided on the machine frame 1, and a cam follower 34 axially supported by a tip of a lower arm 32 a of the cam arm 32 is attached to a pilot release cam 22 by a tension spring 35. Is in contact with. A lifter 37 is connected to the tip of the right arm 32b of the cam arm 32 via a lifter pin 36, and a push pin 38 planted under the lifter 37 is screwed to the tip of the yoke 5 when the crankshaft is at the top dead center. It faces the release bolt 39, which is locked by the wearing nut 40, at a predetermined distance a, and when the crankshaft approaches the bottom dead center, the push pin 38 is released as the pilot release cam 22 rotates. The upper roll is clamped by pushing up the bolt 39.

Reference numeral 41 is an air cylinder that pushes the yoke 5 upward against the bias of the spring rod 15 and separates the upper roll 7 from the lower roll 3.

Since the roll feeder 50 is configured as described above, the air cylinder 10 is in the state shown in FIG. 1 during 0 ° to 180 ° in which the crankshaft rotates from the top dead center to the bottom dead center. The pressing force for pressing the upper roll 7 against the lower roll 3 is weak. Between 180 ° and 360 °, the piston rod 13 projects and a strong pressing force acts on the lower roll 3 to firmly clamp the material.

In the roll feeder 50, the lower roll 3 normally rotates between 270 ° and 90 ° to feed the material W for a predetermined length, so that the material W is strongly pinched at the beginning of feeding and is finished at the end of feeding. Hold it weakly and feed it. Therefore, if the tip of the delivered material (the part where the product was cut off by the previous press working) is brought into contact with the stopper of the die with stopper (upper die), the material will slip at the end of feeding and the feed amount will increase. Be constant. For example, the variation of product size can be kept within ± 0,01mm by making the feed amount of the upper and lower rolls 0 to 0.1mm and slipping about 0.1mm at maximum.

[0018]

[Effect of the device]

 As described above, in the roll feeder of the present invention, the pressing force of the upper roll is changed to be strong or weak so as to sandwich and feed the material, so that the feed amount of the material without the pin hole in the predetermined length feed is made highly accurate. be able to. Therefore, it is possible to use a material without pin holes for high precision press working, the material to be discarded can be greatly reduced, and the cost of the press working can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a roll feeder showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

[Explanation of symbols]

 1 Machine frame 3 Lower roll 5 Yoke 7 Upper roll 10 Air cylinder 15 Spring rod 17 Spring adjuster 19 Spring 22 Pilot release cam 50 Roll feeder

Claims (1)

[Scope of utility model registration request] 1. A yoke rotatably supporting an upper roll and pivotally supported by a machine frame is urged downward by a spring of a spring rod, and the upper roll is pressed against the lower roll. In a roll feeder that nips and feeds material with upper and lower rolls, an air cylinder is fixed to the upper part of the machine frame, and a spring adjuster biased by a spring of the spring rod engages with a peton rod of the air cylinder. The sensing piece is fixed to a drive shaft that rotates in synchronization with the crankshaft, and the sensing piece is detected by a sensor provided in a machine frame to operate the air cylinder. Pressing device for the upper roll in the roll feeder.